diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-02-04 10:57:43 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-02-04 10:57:43 -0800 |
| commit | 4141cf676b9e345d3ddeb1710dd3156a09c50244 (patch) | |
| tree | 4b2b6249e99efdd47eafa5780f106d593f64708b | |
| parent | 3462ac57033e79a87dbae2497773f22b9c536fbc (diff) | |
| parent | e38c85644e11c6dc5a39305c96b617f63403423d (diff) | |
| download | op-kernel-dev-4141cf676b9e345d3ddeb1710dd3156a09c50244.zip op-kernel-dev-4141cf676b9e345d3ddeb1710dd3156a09c50244.tar.gz | |
Merge branch 'i2c/for-4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
Pull i2c updates from Wolfram Sang:
"I2C has the following changes for you:
- new flag to mark DMA safe buffers in i2c_msg. Also, some
infrastructure around it. And docs.
- huge refactoring of the at24 driver led by the new maintainer
Bartosz
- update I2C bus recovery to send STOP after recovery
- conversion from gpio to gpiod for I2C bus recovery
- adding a fault-injector to the i2c-gpio driver
- lots of small driver improvements, and bigger ones to
i2c-sh_mobile"
* 'i2c/for-4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (99 commits)
i2c: mv64xxx: Add myself as maintainer for this driver
i2c: mv64xxx: Fix clock resource by adding an optional bus clock
i2c: mv64xxx: Remove useless test before clk_disable_unprepare
i2c: mxs: use true and false for boolean values
i2c: meson: update doc description to fix build warnings
i2c: meson: add configurable divider factors
dt-bindings: i2c: update documentation for the Meson-AXG
i2c: imx-lpi2c: add runtime pm support
i2c: rcar: fix some trivial typos in comments
i2c: davinci: fix the cpufreq transition
i2c: rk3x: add proper kerneldoc header
i2c: rk3x: account for const type of of_device_id.data
i2c: acorn: remove outdated path from file header
i2c: acorn: add MODULE_LICENSE tag
i2c: rcar: implement bus recovery
i2c: send STOP after successful bus recovery
i2c: ensure SDA is released in recovery if SDA is controllable
i2c: add 'set_sda' to bus_recovery_info
i2c: add identifier in declarations for i2c_bus_recovery
i2c: make kerneldoc about bus recovery more precise
...
45 files changed, 1381 insertions, 1012 deletions
diff --git a/Documentation/devicetree/bindings/eeprom/at24.txt b/Documentation/devicetree/bindings/eeprom/at24.txt new file mode 100644 index 0000000..1812c84 --- /dev/null +++ b/Documentation/devicetree/bindings/eeprom/at24.txt @@ -0,0 +1,78 @@ +EEPROMs (I2C) + +Required properties: + + - compatible: Must be a "<manufacturer>,<model>" pair. The following <model> + values are supported (assuming "atmel" as manufacturer): + + "atmel,24c00", + "atmel,24c01", + "atmel,24cs01", + "atmel,24c02", + "atmel,24cs02", + "atmel,24mac402", + "atmel,24mac602", + "atmel,spd", + "atmel,24c04", + "atmel,24cs04", + "atmel,24c08", + "atmel,24cs08", + "atmel,24c16", + "atmel,24cs16", + "atmel,24c32", + "atmel,24cs32", + "atmel,24c64", + "atmel,24cs64", + "atmel,24c128", + "atmel,24c256", + "atmel,24c512", + "atmel,24c1024", + + If <manufacturer> is not "atmel", then a fallback must be used + with the same <model> and "atmel" as manufacturer. + + Example: + compatible = "microchip,24c128", "atmel,24c128"; + + Supported manufacturers are: + + "catalyst", + "microchip", + "ramtron", + "renesas", + "nxp", + "st", + + Some vendors use different model names for chips which are just + variants of the above. Known such exceptions are listed below: + + "renesas,r1ex24002" - the fallback is "atmel,24c02" + + - reg: The I2C address of the EEPROM. + +Optional properties: + + - pagesize: The length of the pagesize for writing. Please consult the + manual of your device, that value varies a lot. A wrong value + may result in data loss! If not specified, a safety value of + '1' is used which will be very slow. + + - read-only: This parameterless property disables writes to the eeprom. + + - size: Total eeprom size in bytes. + + - no-read-rollover: This parameterless property indicates that the + multi-address eeprom does not automatically roll over + reads to the next slave address. Please consult the + manual of your device. + + - wp-gpios: GPIO to which the write-protect pin of the chip is connected. + +Example: + +eeprom@52 { + compatible = "atmel,24c32"; + reg = <0x52>; + pagesize = <32>; + wp-gpios = <&gpio1 3 0>; +}; diff --git a/Documentation/devicetree/bindings/eeprom/eeprom.txt b/Documentation/devicetree/bindings/eeprom/eeprom.txt deleted file mode 100644 index 27f2bc1..0000000 --- a/Documentation/devicetree/bindings/eeprom/eeprom.txt +++ /dev/null @@ -1,47 +0,0 @@ -EEPROMs (I2C) - -Required properties: - - - compatible : should be "<manufacturer>,<type>", like these: - - "atmel,24c00", "atmel,24c01", "atmel,24c02", "atmel,24c04", - "atmel,24c08", "atmel,24c16", "atmel,24c32", "atmel,24c64", - "atmel,24c128", "atmel,24c256", "atmel,24c512", "atmel,24c1024" - - "catalyst,24c32" - - "microchip,24c128" - - "ramtron,24c64" - - "renesas,r1ex24002" - - The following manufacturers values have been deprecated: - "at", "at24" - - If there is no specific driver for <manufacturer>, a generic - device with <type> and manufacturer "atmel" should be used. - Possible types are: - "24c00", "24c01", "24c02", "24c04", "24c08", "24c16", "24c32", "24c64", - "24c128", "24c256", "24c512", "24c1024", "spd" - - - reg : the I2C address of the EEPROM - -Optional properties: - - - pagesize : the length of the pagesize for writing. Please consult the - manual of your device, that value varies a lot. A wrong value - may result in data loss! If not specified, a safety value of - '1' is used which will be very slow. - - - read-only: this parameterless property disables writes to the eeprom - - - size: total eeprom size in bytes - -Example: - -eeprom@52 { - compatible = "atmel,24c32"; - reg = <0x52>; - pagesize = <32>; -}; diff --git a/Documentation/devicetree/bindings/i2c/i2c-meson.txt b/Documentation/devicetree/bindings/i2c/i2c-meson.txt index 611b934..13d410d 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-meson.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-meson.txt @@ -1,7 +1,11 @@ Amlogic Meson I2C controller Required properties: - - compatible: must be "amlogic,meson6-i2c" or "amlogic,meson-gxbb-i2c" + - compatible: must be: + "amlogic,meson6-i2c" for Meson8 and compatible SoCs + "amlogic,meson-gxbb-i2c" for GXBB and compatible SoCs + "amlogic,meson-axg-i2c"for AXG and compatible SoCs + - reg: physical address and length of the device registers - interrupts: a single interrupt specifier - clocks: clock for the device diff --git a/Documentation/devicetree/bindings/i2c/i2c-mtk.txt b/Documentation/devicetree/bindings/i2c/i2c-mtk.txt index ff7bf37..e199695 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-mtk.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-mtk.txt @@ -5,6 +5,7 @@ The MediaTek's I2C controller is used to interface with I2C devices. Required properties: - compatible: value should be either of the following. "mediatek,mt2701-i2c", "mediatek,mt6577-i2c": for MediaTek MT2701 + "mediatek,mt2712-i2c": for MediaTek MT2712 "mediatek,mt6577-i2c": for MediaTek MT6577 "mediatek,mt6589-i2c": for MediaTek MT6589 "mediatek,mt7622-i2c": for MediaTek MT7622 diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt b/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt index aa09704..34d9150 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt @@ -1,10 +1,19 @@ * NXP PCA954x I2C bus switch +The driver supports NXP PCA954x and PCA984x I2C mux/switch devices. + Required Properties: - compatible: Must contain one of the following. - "nxp,pca9540", "nxp,pca9542", "nxp,pca9543", "nxp,pca9544", - "nxp,pca9545", "nxp,pca9546", "nxp,pca9547", "nxp,pca9548" + "nxp,pca9540", + "nxp,pca9542", + "nxp,pca9543", + "nxp,pca9544", + "nxp,pca9545", + "nxp,pca9546", "nxp,pca9846", + "nxp,pca9547", "nxp,pca9847", + "nxp,pca9548", "nxp,pca9848", + "nxp,pca9849" - reg: The I2C address of the device. diff --git a/Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt b/Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt index 5c30026..0ffe65a 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt @@ -25,6 +25,15 @@ default frequency is 100kHz whenever you're using the "allwinner,sun6i-a31-i2c" compatible. + - clocks: : pointers to the reference clocks for this device, the + first one is the one used for the clock on the i2c bus, + the second one is the clock used to acces the registers + of the controller + + - clock-names : names of used clocks, mandatory if the second clock is + used, the name must be "core", and "reg" (the latter is + only for Armada 7K/8K). + Examples: i2c@11000 { @@ -42,3 +51,14 @@ For the Armada XP: interrupts = <29>; clock-frequency = <100000>; }; + +For the Armada 7040: + + i2c@701000 { + compatible = "marvell,mv78230-i2c"; + reg = <0x701000 0x20>; + interrupts = <29>; + clock-frequency = <100000>; + clock-names = "core", "reg"; + clocks = <&core_clock>, <®_clock>; + }; diff --git a/Documentation/i2c/DMA-considerations b/Documentation/i2c/DMA-considerations new file mode 100644 index 0000000..966610a --- /dev/null +++ b/Documentation/i2c/DMA-considerations @@ -0,0 +1,67 @@ +================= +Linux I2C and DMA +================= + +Given that i2c is a low-speed bus, over which the majority of messages +transferred are small, it is not considered a prime user of DMA access. At this +time of writing, only 10% of I2C bus master drivers have DMA support +implemented. And the vast majority of transactions are so small that setting up +DMA for it will likely add more overhead than a plain PIO transfer. + +Therefore, it is *not* mandatory that the buffer of an I2C message is DMA safe. +It does not seem reasonable to apply additional burdens when the feature is so +rarely used. However, it is recommended to use a DMA-safe buffer if your +message size is likely applicable for DMA. Most drivers have this threshold +around 8 bytes (as of today, this is mostly an educated guess, however). For +any message of 16 byte or larger, it is probably a really good idea. Please +note that other subsystems you use might add requirements. E.g., if your +I2C bus master driver is using USB as a bridge, then you need to have DMA +safe buffers always, because USB requires it. + +Clients +------- + +For clients, if you use a DMA safe buffer in i2c_msg, set the I2C_M_DMA_SAFE +flag with it. Then, the I2C core and drivers know they can safely operate DMA +on it. Note that using this flag is optional. I2C host drivers which are not +updated to use this flag will work like before. And like before, they risk +using an unsafe DMA buffer. To improve this situation, using I2C_M_DMA_SAFE in +more and more clients and host drivers is the planned way forward. Note also +that setting this flag makes only sense in kernel space. User space data is +copied into kernel space anyhow. The I2C core makes sure the destination +buffers in kernel space are always DMA capable. Also, when the core emulates +SMBus transactions via I2C, the buffers for block transfers are DMA safe. Users +of i2c_master_send() and i2c_master_recv() functions can now use DMA safe +variants (i2c_master_send_dmasafe() and i2c_master_recv_dmasafe()) once they +know their buffers are DMA safe. Users of i2c_transfer() must set the +I2C_M_DMA_SAFE flag manually. + +Masters +------- + +Bus master drivers wishing to implement safe DMA can use helper functions from +the I2C core. One gives you a DMA-safe buffer for a given i2c_msg as long as a +certain threshold is met:: + + dma_buf = i2c_get_dma_safe_msg_buf(msg, threshold_in_byte); + +If a buffer is returned, it is either msg->buf for the I2C_M_DMA_SAFE case or a +bounce buffer. But you don't need to care about that detail, just use the +returned buffer. If NULL is returned, the threshold was not met or a bounce +buffer could not be allocated. Fall back to PIO in that case. + +In any case, a buffer obtained from above needs to be released. It ensures data +is copied back to the message and a potentially used bounce buffer is freed:: + + i2c_release_dma_safe_msg_buf(msg, dma_buf); + +The bounce buffer handling from the core is generic and simple. It will always +allocate a new bounce buffer. If you want a more sophisticated handling (e.g. +reusing pre-allocated buffers), you are free to implement your own. + +Please also check the in-kernel documentation for details. The i2c-sh_mobile +driver can be used as a reference example how to use the above helpers. + +Final note: If you plan to use DMA with I2C (or with anything else, actually) +make sure you have CONFIG_DMA_API_DEBUG enabled during development. It can help +you find various issues which can be complex to debug otherwise. diff --git a/Documentation/i2c/gpio-fault-injection b/Documentation/i2c/gpio-fault-injection new file mode 100644 index 0000000..e0c4f77 --- /dev/null +++ b/Documentation/i2c/gpio-fault-injection @@ -0,0 +1,54 @@ +Linux I2C fault injection +========================= + +The GPIO based I2C bus master driver can be configured to provide fault +injection capabilities. It is then meant to be connected to another I2C bus +which is driven by the I2C bus master driver under test. The GPIO fault +injection driver can create special states on the bus which the other I2C bus +master driver should handle gracefully. + +Once the Kconfig option I2C_GPIO_FAULT_INJECTOR is enabled, there will be an +'i2c-fault-injector' subdirectory in the Kernel debugfs filesystem, usually +mounted at /sys/kernel/debug. There will be a separate subdirectory per GPIO +driven I2C bus. Each subdirectory will contain files to trigger the fault +injection. They will be described now along with their intended use-cases. + +"scl" +----- + +By reading this file, you get the current state of SCL. By writing, you can +change its state to either force it low or to release it again. So, by using +"echo 0 > scl" you force SCL low and thus, no communication will be possible +because the bus master under test will not be able to clock. It should detect +the condition of SCL being unresponsive and report an error to the upper +layers. + +"sda" +----- + +By reading this file, you get the current state of SDA. By writing, you can +change its state to either force it low or to release it again. So, by using +"echo 0 > sda" you force SDA low and thus, data cannot be transmitted. The bus +master under test should detect this condition and trigger a bus recovery (see +I2C specification version 4, section 3.1.16) using the helpers of the Linux I2C +core (see 'struct bus_recovery_info'). However, the bus recovery will not +succeed because SDA is still pinned low until you manually release it again +with "echo 1 > sda". A test with an automatic release can be done with the +'incomplete_transfer' file. + +"incomplete_transfer" +--------------------- + +This file is write only and you need to write the address of an existing I2C +client device to it. Then, a transfer to this device will be started, but it +will stop at the ACK phase after the address of the client has been +transmitted. Because the device will ACK its presence, this results in SDA +being pulled low by the device while SCL is high. So, similar to the "sda" file +above, the bus master under test should detect this condition and try a bus +recovery. This time, however, it should succeed and the device should release +SDA after toggling SCL. Please note: there are I2C client devices which detect +a stuck SDA on their side and release it on their own after a few milliseconds. +Also, there are external devices deglitching and monitoring the I2C bus. They +can also detect a stuck SDA and will init a bus recovery on their own. If you +want to implement bus recovery in a bus master driver, make sure you checked +your hardware setup carefully before. diff --git a/MAINTAINERS b/MAINTAINERS index f3bac2a..e15f4e2 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2288,7 +2288,9 @@ F: include/linux/async_tx.h AT24 EEPROM DRIVER M: Bartosz Golaszewski <brgl@bgdev.pl> L: linux-i2c@vger.kernel.org +T: git git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux.git S: Maintained +F: Documentation/devicetree/bindings/eeprom/at24.txt F: drivers/misc/eeprom/at24.c F: include/linux/platform_data/at24.h @@ -6580,6 +6582,12 @@ F: drivers/i2c/i2c-mux.c F: drivers/i2c/muxes/ F: include/linux/i2c-mux.h +I2C MV64XXX MARVELL AND ALLWINNER DRIVER +M: Gregory CLEMENT <gregory.clement@free-electrons.com> +L: linux-i2c@vger.kernel.org +S: Maintained +F: drivers/i2c/busses/i2c-mv64xxx.c + I2C OVER PARALLEL PORT M: Jean Delvare <jdelvare@suse.com> L: linux-i2c@vger.kernel.org diff --git a/arch/arm/mach-davinci/board-dm355-evm.c b/arch/arm/mach-davinci/board-dm355-evm.c index 62e7bc3..e457f29 100644 --- a/arch/arm/mach-davinci/board-dm355-evm.c +++ b/arch/arm/mach-davinci/board-dm355-evm.c @@ -17,6 +17,7 @@ #include <linux/mtd/rawnand.h> #include <linux/i2c.h> #include <linux/gpio.h> +#include <linux/gpio/machine.h> #include <linux/clk.h> #include <linux/videodev2.h> #include <media/i2c/tvp514x.h> @@ -108,11 +109,20 @@ static struct platform_device davinci_nand_device = { }, }; +static struct gpiod_lookup_table i2c_recovery_gpiod_table = { + .dev_id = "i2c_davinci", + .table = { + GPIO_LOOKUP("davinci_gpio", 15, "sda", + GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), + GPIO_LOOKUP("davinci_gpio", 14, "scl", + GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), + }, +}; + static struct davinci_i2c_platform_data i2c_pdata = { .bus_freq = 400 /* kHz */, .bus_delay = 0 /* usec */, - .sda_pin = 15, - .scl_pin = 14, + .gpio_recovery = true, }; static int dm355evm_mmc_gpios = -EINVAL; @@ -141,6 +151,7 @@ static struct i2c_board_info dm355evm_i2c_info[] = { static void __init evm_init_i2c(void) { + gpiod_add_lookup_table(&i2c_recovery_gpiod_table); davinci_init_i2c(&i2c_pdata); gpio_request(5, "dm355evm_msp"); diff --git a/arch/arm/mach-davinci/board-dm644x-evm.c b/arch/arm/mach-davinci/board-dm644x-evm.c index b07c9b1..85e6fb3 100644 --- a/arch/arm/mach-davinci/board-dm644x-evm.c +++ b/arch/arm/mach-davinci/board-dm644x-evm.c @@ -13,6 +13,7 @@ #include <linux/dma-mapping.h> #include <linux/platform_device.h> #include <linux/gpio.h> +#include <linux/gpio/machine.h> #include <linux/i2c.h> #include <linux/platform_data/pcf857x.h> #include <linux/platform_data/at24.h> @@ -595,18 +596,28 @@ static struct i2c_board_info __initdata i2c_info[] = { }, }; +static struct gpiod_lookup_table i2c_recovery_gpiod_table = { + .dev_id = "i2c_davinci", + .table = { + GPIO_LOOKUP("davinci_gpio", 44, "sda", + GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), + GPIO_LOOKUP("davinci_gpio", 43, "scl", + GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN), + }, +}; + /* The msp430 uses a slow bitbanged I2C implementation (ergo 20 KHz), * which requires 100 usec of idle bus after i2c writes sent to it. */ static struct davinci_i2c_platform_data i2c_pdata = { .bus_freq = 20 /* kHz */, .bus_delay = 100 /* usec */, - .sda_pin = 44, - .scl_pin = 43, + .gpio_recovery = true, }; static void __init evm_init_i2c(void) { + gpiod_add_lookup_table(&i2c_recovery_gpiod_table); davinci_init_i2c(&i2c_pdata); i2c_add_driver(&dm6446evm_msp_driver); i2c_register_board_info(1, i2c_info, ARRAY_SIZE(i2c_info)); diff --git a/drivers/i2c/algos/i2c-algo-bit.c b/drivers/i2c/algos/i2c-algo-bit.c index 1147bdd..3df0efd 100644 --- a/drivers/i2c/algos/i2c-algo-bit.c +++ b/drivers/i2c/algos/i2c-algo-bit.c @@ -649,6 +649,11 @@ static int __i2c_bit_add_bus(struct i2c_adapter *adap, if (bit_adap->getscl == NULL) adap->quirks = &i2c_bit_quirk_no_clk_stretch; + /* Bring bus to a known state. Looks like STOP if bus is not free yet */ + setscl(bit_adap, 1); + udelay(bit_adap->udelay); + setsda(bit_adap, 1); + ret = add_adapter(adap); if (ret < 0) return ret; diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index 009345d..a9805c7 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -603,6 +603,14 @@ config I2C_GPIO This is a very simple bitbanging I2C driver utilizing the arch-neutral GPIO API to control the SCL and SDA lines. +config I2C_GPIO_FAULT_INJECTOR + bool "GPIO-based fault injector" + depends on I2C_GPIO + help + This adds some functionality to the i2c-gpio driver which can inject + faults to an I2C bus, so another bus master can be stress-tested. + This is for debugging. If unsure, say 'no'. + config I2C_HIGHLANDER tristate "Highlander FPGA SMBus interface" depends on SH_HIGHLANDER diff --git a/drivers/i2c/busses/i2c-acorn.c b/drivers/i2c/busses/i2c-acorn.c index 9d7be5a..f4a5ae6 100644 --- a/drivers/i2c/busses/i2c-acorn.c +++ b/drivers/i2c/busses/i2c-acorn.c @@ -1,5 +1,5 @@ /* - * linux/drivers/acorn/char/i2c.c + * ARM IOC/IOMD i2c driver. * * Copyright (C) 2000 Russell King * @@ -7,8 +7,6 @@ * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * - * ARM IOC/IOMD i2c driver. - * * On Acorn machines, the following i2c devices are on the bus: * - PCF8583 real time clock & static RAM */ @@ -94,3 +92,7 @@ static int __init i2c_ioc_init(void) } module_init(i2c_ioc_init); + +MODULE_AUTHOR("Russell King <linux@armlinux.org.uk>"); +MODULE_DESCRIPTION("ARM IOC/IOMD i2c driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c index 2ead9b9..75d6ab1 100644 --- a/drivers/i2c/busses/i2c-davinci.c +++ b/drivers/i2c/busses/i2c-davinci.c @@ -33,7 +33,7 @@ #include <linux/io.h> #include <linux/slab.h> #include <linux/cpufreq.h> -#include <linux/gpio.h> +#include <linux/gpio/consumer.h> #include <linux/of_device.h> #include <linux/platform_data/i2c-davinci.h> #include <linux/pm_runtime.h> @@ -139,7 +139,6 @@ struct davinci_i2c_dev { u8 terminate; struct i2c_adapter adapter; #ifdef CONFIG_CPU_FREQ - struct completion xfr_complete; struct notifier_block freq_transition; #endif struct davinci_i2c_platform_data *pdata; @@ -294,7 +293,7 @@ static int i2c_davinci_init(struct davinci_i2c_dev *dev) } /* - * This routine does i2c bus recovery by using i2c_generic_gpio_recovery + * This routine does i2c bus recovery by using i2c_generic_scl_recovery * which is provided by I2C Bus recovery infrastructure. */ static void davinci_i2c_prepare_recovery(struct i2c_adapter *adap) @@ -316,7 +315,7 @@ static void davinci_i2c_unprepare_recovery(struct i2c_adapter *adap) } static struct i2c_bus_recovery_info davinci_i2c_gpio_recovery_info = { - .recover_bus = i2c_generic_gpio_recovery, + .recover_bus = i2c_generic_scl_recovery, .prepare_recovery = davinci_i2c_prepare_recovery, .unprepare_recovery = davinci_i2c_unprepare_recovery, }; @@ -567,9 +566,6 @@ i2c_davinci_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) } ret = num; -#ifdef CONFIG_CPU_FREQ - complete(&dev->xfr_complete); -#endif out: pm_runtime_mark_last_busy(dev->dev); @@ -717,13 +713,15 @@ static int i2c_davinci_cpufreq_transition(struct notifier_block *nb, struct davinci_i2c_dev *dev; dev = container_of(nb, struct davinci_i2c_dev, freq_transition); + + i2c_lock_adapter(&dev->adapter); if (val == CPUFREQ_PRECHANGE) { - wait_for_completion(&dev->xfr_complete); davinci_i2c_reset_ctrl(dev, 0); } else if (val == CPUFREQ_POSTCHANGE) { i2c_davinci_calc_clk_dividers(dev); davinci_i2c_reset_ctrl(dev, 1); } + i2c_unlock_adapter(&dev->adapter); return 0; } @@ -769,6 +767,7 @@ static int davinci_i2c_probe(struct platform_device *pdev) struct davinci_i2c_dev *dev; struct i2c_adapter *adap; struct resource *mem; + struct i2c_bus_recovery_info *rinfo; int r, irq; irq = platform_get_irq(pdev, 0); @@ -789,9 +788,7 @@ static int davinci_i2c_probe(struct platform_device *pdev) } init_completion(&dev->cmd_complete); -#ifdef CONFIG_CPU_FREQ - init_completion(&dev->xfr_complete); -#endif + dev->dev = &pdev->dev; dev->irq = irq; dev->pdata = dev_get_platdata(&pdev->dev); @@ -868,10 +865,20 @@ static int davinci_i2c_probe(struct platform_device *pdev) if (dev->pdata->has_pfunc) adap->bus_recovery_info = &davinci_i2c_scl_recovery_info; - else if (dev->pdata->scl_pin) { - adap->bus_recovery_info = &davinci_i2c_gpio_recovery_info; - adap->bus_recovery_info->scl_gpio = dev->pdata->scl_pin; - adap->bus_recovery_info->sda_gpio = dev->pdata->sda_pin; + else if (dev->pdata->gpio_recovery) { + rinfo = &davinci_i2c_gpio_recovery_info; + adap->bus_recovery_info = rinfo; + rinfo->scl_gpiod = devm_gpiod_get(&pdev->dev, "scl", + GPIOD_OUT_HIGH_OPEN_DRAIN); + if (IS_ERR(rinfo->scl_gpiod)) { + r = PTR_ERR(rinfo->scl_gpiod); + goto err_unuse_clocks; + } + rinfo->sda_gpiod = devm_gpiod_get(&pdev->dev, "sda", GPIOD_IN); + if (IS_ERR(rinfo->sda_gpiod)) { + r = PTR_ERR(rinfo->sda_gpiod); + goto err_unuse_clocks; + } } adap->nr = pdev->id; diff --git a/drivers/i2c/busses/i2c-designware-common.c b/drivers/i2c/busses/i2c-designware-common.c index d1a6937..27ebd90 100644 --- a/drivers/i2c/busses/i2c-designware-common.c +++ b/drivers/i2c/busses/i2c-designware-common.c @@ -21,6 +21,7 @@ * ---------------------------------------------------------------------------- * */ +#include <linux/clk.h> #include <linux/delay.h> #include <linux/export.h> #include <linux/errno.h> @@ -185,6 +186,19 @@ unsigned long i2c_dw_clk_rate(struct dw_i2c_dev *dev) return dev->get_clk_rate_khz(dev); } +int i2c_dw_prepare_clk(struct dw_i2c_dev *dev, bool prepare) +{ + if (IS_ERR(dev->clk)) + return PTR_ERR(dev->clk); + + if (prepare) + return clk_prepare_enable(dev->clk); + + clk_disable_unprepare(dev->clk); + return 0; +} +EXPORT_SYMBOL_GPL(i2c_dw_prepare_clk); + int i2c_dw_acquire_lock(struct dw_i2c_dev *dev) { int ret; @@ -217,7 +231,11 @@ int i2c_dw_wait_bus_not_busy(struct dw_i2c_dev *dev) while (dw_readl(dev, DW_IC_STATUS) & DW_IC_STATUS_ACTIVITY) { if (timeout <= 0) { dev_warn(dev->dev, "timeout waiting for bus ready\n"); - return -ETIMEDOUT; + i2c_recover_bus(&dev->adapter); + + if (dw_readl(dev, DW_IC_STATUS) & DW_IC_STATUS_ACTIVITY) + return -ETIMEDOUT; + return 0; } timeout--; usleep_range(1000, 1100); diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h index 9fee4c0..8707c76 100644 --- a/drivers/i2c/busses/i2c-designware-core.h +++ b/drivers/i2c/busses/i2c-designware-core.h @@ -284,6 +284,7 @@ struct dw_i2c_dev { void (*disable_int)(struct dw_i2c_dev *dev); int (*init)(struct dw_i2c_dev *dev); int mode; + struct i2c_bus_recovery_info rinfo; }; #define ACCESS_SWAP 0x00000001 @@ -299,6 +300,7 @@ u32 i2c_dw_scl_lcnt(u32 ic_clk, u32 tLOW, u32 tf, int offset); void __i2c_dw_enable(struct dw_i2c_dev *dev, bool enable); void __i2c_dw_enable_and_wait(struct dw_i2c_dev *dev, bool enable); unsigned long i2c_dw_clk_rate(struct dw_i2c_dev *dev); +int i2c_dw_prepare_clk(struct dw_i2c_dev *dev, bool prepare); int i2c_dw_acquire_lock(struct dw_i2c_dev *dev); void i2c_dw_release_lock(struct dw_i2c_dev *dev); int i2c_dw_wait_bus_not_busy(struct dw_i2c_dev *dev); diff --git a/drivers/i2c/busses/i2c-designware-master.c b/drivers/i2c/busses/i2c-designware-master.c index 418c233..ae69188 100644 --- a/drivers/i2c/busses/i2c-designware-master.c +++ b/drivers/i2c/busses/i2c-designware-master.c @@ -25,11 +25,13 @@ #include <linux/err.h> #include <linux/errno.h> #include <linux/export.h> +#include <linux/gpio/consumer.h> #include <linux/i2c.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/module.h> #include <linux/pm_runtime.h> +#include <linux/reset.h> #include "i2c-designware-core.h" @@ -443,6 +445,7 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) if (!wait_for_completion_timeout(&dev->cmd_complete, adap->timeout)) { dev_err(dev->dev, "controller timed out\n"); /* i2c_dw_init implicitly disables the adapter */ + i2c_recover_bus(&dev->adapter); i2c_dw_init_master(dev); ret = -ETIMEDOUT; goto done; @@ -613,6 +616,56 @@ static irqreturn_t i2c_dw_isr(int this_irq, void *dev_id) return IRQ_HANDLED; } +static void i2c_dw_prepare_recovery(struct i2c_adapter *adap) +{ + struct dw_i2c_dev *dev = i2c_get_adapdata(adap); + + i2c_dw_disable(dev); + reset_control_assert(dev->rst); + i2c_dw_prepare_clk(dev, false); +} + +static void i2c_dw_unprepare_recovery(struct i2c_adapter *adap) +{ + struct dw_i2c_dev *dev = i2c_get_adapdata(adap); + + i2c_dw_prepare_clk(dev, true); + reset_control_deassert(dev->rst); + i2c_dw_init_master(dev); +} + +static int i2c_dw_init_recovery_info(struct dw_i2c_dev *dev) +{ + struct i2c_bus_recovery_info *rinfo = &dev->rinfo; + struct i2c_adapter *adap = &dev->adapter; + struct gpio_desc *gpio; + int r; + + gpio = devm_gpiod_get(dev->dev, "scl", GPIOD_OUT_HIGH); + if (IS_ERR(gpio)) { + r = PTR_ERR(gpio); + if (r == -ENOENT) + return 0; + return r; + } + rinfo->scl_gpiod = gpio; + + gpio = devm_gpiod_get_optional(dev->dev, "sda", GPIOD_IN); + if (IS_ERR(gpio)) + return PTR_ERR(gpio); + rinfo->sda_gpiod = gpio; + + rinfo->recover_bus = i2c_generic_scl_recovery; + rinfo->prepare_recovery = i2c_dw_prepare_recovery; + rinfo->unprepare_recovery = i2c_dw_unprepare_recovery; + adap->bus_recovery_info = rinfo; + + dev_info(dev->dev, "running with gpio recovery mode! scl%s", + rinfo->sda_gpiod ? ",sda" : ""); + + return 0; +} + int i2c_dw_probe(struct dw_i2c_dev *dev) { struct i2c_adapter *adap = &dev->adapter; @@ -652,6 +705,10 @@ int i2c_dw_probe(struct dw_i2c_dev *dev) return ret; } + ret = i2c_dw_init_recovery_info(dev); + if (ret) + return ret; + /* * Increment PM usage count during adapter registration in order to * avoid possible spurious runtime suspend when adapter device is diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index 153b947..5660daf 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -202,29 +202,6 @@ static void i2c_dw_configure_slave(struct dw_i2c_dev *dev) DW_IC_CON_RESTART_EN | DW_IC_CON_STOP_DET_IFADDRESSED; dev->mode = DW_IC_SLAVE; - - switch (dev->clk_freq) { - case 100000: - dev->slave_cfg |= DW_IC_CON_SPEED_STD; - break; - case 3400000: - dev->slave_cfg |= DW_IC_CON_SPEED_HIGH; - break; - default: - dev->slave_cfg |= DW_IC_CON_SPEED_FAST; - } -} - -static int i2c_dw_plat_prepare_clk(struct dw_i2c_dev *i_dev, bool prepare) -{ - if (IS_ERR(i_dev->clk)) - return PTR_ERR(i_dev->clk); - - if (prepare) - return clk_prepare_enable(i_dev->clk); - - clk_disable_unprepare(i_dev->clk); - return 0; } static void dw_i2c_set_fifo_size(struct dw_i2c_dev *dev, int id) @@ -356,7 +333,7 @@ static int dw_i2c_plat_probe(struct platform_device *pdev) i2c_dw_configure_master(dev); dev->clk = devm_clk_get(&pdev->dev, NULL); - if (!i2c_dw_plat_prepare_clk(dev, true)) { + if (!i2c_dw_prepare_clk(dev, true)) { dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz; if (!dev->sda_hold_time && ht) @@ -472,7 +449,7 @@ static int dw_i2c_plat_suspend(struct device *dev) struct dw_i2c_dev *i_dev = dev_get_drvdata(dev); i_dev->disable(i_dev); - i2c_dw_plat_prepare_clk(i_dev, false); + i2c_dw_prepare_clk(i_dev, false); return 0; } @@ -481,7 +458,7 @@ static int dw_i2c_plat_resume(struct device *dev) { struct dw_i2c_dev *i_dev = dev_get_drvdata(dev); - i2c_dw_plat_prepare_clk(i_dev, true); + i2c_dw_prepare_clk(i_dev, true); i_dev->init(i_dev); return 0; diff --git a/drivers/i2c/busses/i2c-designware-slave.c b/drivers/i2c/busses/i2c-designware-slave.c index ea9578a..d42558d 100644 --- a/drivers/i2c/busses/i2c-designware-slave.c +++ b/drivers/i2c/busses/i2c-designware-slave.c @@ -51,9 +51,7 @@ static void i2c_dw_configure_fifo_slave(struct dw_i2c_dev *dev) */ static int i2c_dw_init_slave(struct dw_i2c_dev *dev) { - u32 sda_falling_time, scl_falling_time; u32 reg, comp_param1; - u32 hcnt, lcnt; int ret; ret = i2c_dw_acquire_lock(dev); @@ -79,68 +77,6 @@ static int i2c_dw_init_slave(struct dw_i2c_dev *dev) /* Disable the adapter. */ __i2c_dw_enable_and_wait(dev, false); - /* Set standard and fast speed deviders for high/low periods. */ - sda_falling_time = dev->sda_falling_time ?: 300; /* ns */ - scl_falling_time = dev->scl_falling_time ?: 300; /* ns */ - - /* Set SCL timing parameters for standard-mode. */ - if (dev->ss_hcnt && dev->ss_lcnt) { - hcnt = dev->ss_hcnt; - lcnt = dev->ss_lcnt; - } else { - hcnt = i2c_dw_scl_hcnt(i2c_dw_clk_rate(dev), - 4000, /* tHD;STA = tHIGH = 4.0 us */ - sda_falling_time, - 0, /* 0: DW default, 1: Ideal */ - 0); /* No offset */ - lcnt = i2c_dw_scl_lcnt(i2c_dw_clk_rate(dev), - 4700, /* tLOW = 4.7 us */ - scl_falling_time, - 0); /* No offset */ - } - dw_writel(dev, hcnt, DW_IC_SS_SCL_HCNT); - dw_writel(dev, lcnt, DW_IC_SS_SCL_LCNT); - dev_dbg(dev->dev, "Standard-mode HCNT:LCNT = %d:%d\n", hcnt, lcnt); - - /* Set SCL timing parameters for fast-mode or fast-mode plus. */ - if ((dev->clk_freq == 1000000) && dev->fp_hcnt && dev->fp_lcnt) { - hcnt = dev->fp_hcnt; - lcnt = dev->fp_lcnt; - } else if (dev->fs_hcnt && dev->fs_lcnt) { - hcnt = dev->fs_hcnt; - lcnt = dev->fs_lcnt; - } else { - hcnt = i2c_dw_scl_hcnt(i2c_dw_clk_rate(dev), - 600, /* tHD;STA = tHIGH = 0.6 us */ - sda_falling_time, - 0, /* 0: DW default, 1: Ideal */ - 0); /* No offset */ - lcnt = i2c_dw_scl_lcnt(i2c_dw_clk_rate(dev), - 1300, /* tLOW = 1.3 us */ - scl_falling_time, - 0); /* No offset */ - } - dw_writel(dev, hcnt, DW_IC_FS_SCL_HCNT); - dw_writel(dev, lcnt, DW_IC_FS_SCL_LCNT); - dev_dbg(dev->dev, "Fast-mode HCNT:LCNT = %d:%d\n", hcnt, lcnt); - - if ((dev->slave_cfg & DW_IC_CON_SPEED_MASK) == - DW_IC_CON_SPEED_HIGH) { - if ((comp_param1 & DW_IC_COMP_PARAM_1_SPEED_MODE_MASK) - != DW_IC_COMP_PARAM_1_SPEED_MODE_HIGH) { - dev_err(dev->dev, "High Speed not supported!\n"); - dev->slave_cfg &= ~DW_IC_CON_SPEED_MASK; - dev->slave_cfg |= DW_IC_CON_SPEED_FAST; - } else if (dev->hs_hcnt && dev->hs_lcnt) { - hcnt = dev->hs_hcnt; - lcnt = dev->hs_lcnt; - dw_writel(dev, hcnt, DW_IC_HS_SCL_HCNT); - dw_writel(dev, lcnt, DW_IC_HS_SCL_LCNT); - dev_dbg(dev->dev, "HighSpeed-mode HCNT:LCNT = %d:%d\n", - hcnt, lcnt); - } - } - /* Configure SDA Hold Time if required. */ reg = dw_readl(dev, DW_IC_COMP_VERSION); if (reg >= DW_IC_SDA_HOLD_MIN_VERS) { diff --git a/drivers/i2c/busses/i2c-exynos5.c b/drivers/i2c/busses/i2c-exynos5.c index 3855e0b..b024284 100644 --- a/drivers/i2c/busses/i2c-exynos5.c +++ b/drivers/i2c/busses/i2c-exynos5.c @@ -170,7 +170,7 @@ #define HSI2C_HS_TX_CLOCK 1000000 #define HSI2C_FS_TX_CLOCK 100000 -#define EXYNOS5_I2C_TIMEOUT (msecs_to_jiffies(1000)) +#define EXYNOS5_I2C_TIMEOUT (msecs_to_jiffies(100)) #define HSI2C_EXYNOS7 BIT(0) diff --git a/drivers/i2c/busses/i2c-gpio.c b/drivers/i2c/busses/i2c-gpio.c index d80ea6c..58abb3e 100644 --- a/drivers/i2c/busses/i2c-gpio.c +++ b/drivers/i2c/busses/i2c-gpio.c @@ -7,6 +7,8 @@ * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ +#include <linux/debugfs.h> +#include <linux/delay.h> #include <linux/i2c.h> #include <linux/i2c-algo-bit.h> #include <linux/i2c-gpio.h> @@ -23,6 +25,9 @@ struct i2c_gpio_private_data { struct i2c_adapter adap; struct i2c_algo_bit_data bit_data; struct i2c_gpio_platform_data pdata; +#ifdef CONFIG_I2C_GPIO_FAULT_INJECTOR + struct dentry *debug_dir; +#endif }; /* @@ -34,7 +39,7 @@ static void i2c_gpio_setsda_val(void *data, int state) { struct i2c_gpio_private_data *priv = data; - gpiod_set_value(priv->sda, state); + gpiod_set_value_cansleep(priv->sda, state); } /* @@ -47,23 +52,125 @@ static void i2c_gpio_setscl_val(void *data, int state) { struct i2c_gpio_private_data *priv = data; - gpiod_set_value(priv->scl, state); + gpiod_set_value_cansleep(priv->scl, state); } static int i2c_gpio_getsda(void *data) { struct i2c_gpio_private_data *priv = data; - return gpiod_get_value(priv->sda); + return gpiod_get_value_cansleep(priv->sda); } static int i2c_gpio_getscl(void *data) { struct i2c_gpio_private_data *priv = data; - return gpiod_get_value(priv->scl); + return gpiod_get_value_cansleep(priv->scl); +} + +#ifdef CONFIG_I2C_GPIO_FAULT_INJECTOR +static struct dentry *i2c_gpio_debug_dir; + +#define setsda(bd, val) ((bd)->setsda((bd)->data, val)) +#define setscl(bd, val) ((bd)->setscl((bd)->data, val)) +#define getsda(bd) ((bd)->getsda((bd)->data)) +#define getscl(bd) ((bd)->getscl((bd)->data)) + +#define WIRE_ATTRIBUTE(wire) \ +static int fops_##wire##_get(void *data, u64 *val) \ +{ \ + struct i2c_gpio_private_data *priv = data; \ + \ + i2c_lock_adapter(&priv->adap); \ + *val = get##wire(&priv->bit_data); \ + i2c_unlock_adapter(&priv->adap); \ + return 0; \ +} \ +static int fops_##wire##_set(void *data, u64 val) \ +{ \ + struct i2c_gpio_private_data *priv = data; \ + \ + i2c_lock_adapter(&priv->adap); \ + set##wire(&priv->bit_data, val); \ + i2c_unlock_adapter(&priv->adap); \ + return 0; \ +} \ +DEFINE_DEBUGFS_ATTRIBUTE(fops_##wire, fops_##wire##_get, fops_##wire##_set, "%llu\n") + +WIRE_ATTRIBUTE(scl); +WIRE_ATTRIBUTE(sda); + +static int fops_incomplete_transfer_set(void *data, u64 addr) +{ + struct i2c_gpio_private_data *priv = data; + struct i2c_algo_bit_data *bit_data = &priv->bit_data; + int i, pattern; + + if (addr > 0x7f) + return -EINVAL; + + /* ADDR (7 bit) + RD (1 bit) + SDA hi (1 bit) */ + pattern = (addr << 2) | 3; + + i2c_lock_adapter(&priv->adap); + + /* START condition */ + setsda(bit_data, 0); + udelay(bit_data->udelay); + + /* Send ADDR+RD, request ACK, don't send STOP */ + for (i = 8; i >= 0; i--) { + setscl(bit_data, 0); + udelay(bit_data->udelay / 2); + setsda(bit_data, (pattern >> i) & 1); + udelay((bit_data->udelay + 1) / 2); + setscl(bit_data, 1); + udelay(bit_data->udelay); + } + + i2c_unlock_adapter(&priv->adap); + + return 0; +} +DEFINE_DEBUGFS_ATTRIBUTE(fops_incomplete_transfer, NULL, fops_incomplete_transfer_set, "%llu\n"); + +static void i2c_gpio_fault_injector_init(struct platform_device *pdev) +{ + struct i2c_gpio_private_data *priv = platform_get_drvdata(pdev); + + /* + * If there will be a debugfs-dir per i2c adapter somewhen, put the + * 'fault-injector' dir there. Until then, we have a global dir with + * all adapters as subdirs. + */ + if (!i2c_gpio_debug_dir) { + i2c_gpio_debug_dir = debugfs_create_dir("i2c-fault-injector", NULL); + if (!i2c_gpio_debug_dir) + return; + } + + priv->debug_dir = debugfs_create_dir(pdev->name, i2c_gpio_debug_dir); + if (!priv->debug_dir) + return; + + debugfs_create_file_unsafe("scl", 0600, priv->debug_dir, priv, &fops_scl); + debugfs_create_file_unsafe("sda", 0600, priv->debug_dir, priv, &fops_sda); + debugfs_create_file_unsafe("incomplete_transfer", 0200, priv->debug_dir, + priv, &fops_incomplete_transfer); } +static void i2c_gpio_fault_injector_exit(struct platform_device *pdev) +{ + struct i2c_gpio_private_data *priv = platform_get_drvdata(pdev); + + debugfs_remove_recursive(priv->debug_dir); +} +#else +static inline void i2c_gpio_fault_injector_init(struct platform_device *pdev) {} +static inline void i2c_gpio_fault_injector_exit(struct platform_device *pdev) {} +#endif /* CONFIG_I2C_GPIO_FAULT_INJECTOR*/ + static void of_i2c_gpio_get_props(struct device_node *np, struct i2c_gpio_platform_data *pdata) { @@ -179,6 +286,9 @@ static int i2c_gpio_probe(struct platform_device *pdev) if (IS_ERR(priv->scl)) return PTR_ERR(priv->scl); + if (gpiod_cansleep(priv->sda) || gpiod_cansleep(priv->scl)) + dev_warn(dev, "Slow GPIO pins might wreak havoc into I2C/SMBus bus timing"); + bit_data->setsda = i2c_gpio_setsda_val; bit_data->setscl = i2c_gpio_setscl_val; @@ -228,6 +338,8 @@ static int i2c_gpio_probe(struct platform_device *pdev) pdata->scl_is_output_only ? ", no clock stretching" : ""); + i2c_gpio_fault_injector_init(pdev); + return 0; } @@ -236,6 +348,8 @@ static int i2c_gpio_remove(struct platform_device *pdev) struct i2c_gpio_private_data *priv; struct i2c_adapter *adap; + i2c_gpio_fault_injector_exit(pdev); + priv = platform_get_drvdata(pdev); adap = &priv->adap; diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c index e86801a..e6da2c7 100644 --- a/drivers/i2c/busses/i2c-imx-lpi2c.c +++ b/drivers/i2c/busses/i2c-imx-lpi2c.c @@ -30,6 +30,7 @@ #include <linux/of_device.h> #include <linux/pinctrl/consumer.h> #include <linux/platform_device.h> +#include <linux/pm_runtime.h> #include <linux/sched.h> #include <linux/slab.h> @@ -90,6 +91,8 @@ #define FAST_PLUS_MAX_BITRATE 3400000 #define HIGHSPEED_MAX_BITRATE 5000000 +#define I2C_PM_TIMEOUT 10 /* ms */ + enum lpi2c_imx_mode { STANDARD, /* 100+Kbps */ FAST, /* 400+Kbps */ @@ -274,8 +277,8 @@ static int lpi2c_imx_master_enable(struct lpi2c_imx_struct *lpi2c_imx) unsigned int temp; int ret; - ret = clk_enable(lpi2c_imx->clk); - if (ret) + ret = pm_runtime_get_sync(lpi2c_imx->adapter.dev.parent); + if (ret < 0) return ret; temp = MCR_RST; @@ -284,7 +287,7 @@ static int lpi2c_imx_master_enable(struct lpi2c_imx_struct *lpi2c_imx) ret = lpi2c_imx_config(lpi2c_imx); if (ret) - goto clk_disable; + goto rpm_put; temp = readl(lpi2c_imx->base + LPI2C_MCR); temp |= MCR_MEN; @@ -292,8 +295,9 @@ static int lpi2c_imx_master_enable(struct lpi2c_imx_struct *lpi2c_imx) return 0; -clk_disable: - clk_disable(lpi2c_imx->clk); +rpm_put: + pm_runtime_mark_last_busy(lpi2c_imx->adapter.dev.parent); + pm_runtime_put_autosuspend(lpi2c_imx->adapter.dev.parent); return ret; } @@ -306,7 +310,8 @@ static int lpi2c_imx_master_disable(struct lpi2c_imx_struct *lpi2c_imx) temp &= ~MCR_MEN; writel(temp, lpi2c_imx->base + LPI2C_MCR); - clk_disable(lpi2c_imx->clk); + pm_runtime_mark_last_busy(lpi2c_imx->adapter.dev.parent); + pm_runtime_put_autosuspend(lpi2c_imx->adapter.dev.parent); return 0; } @@ -606,22 +611,31 @@ static int lpi2c_imx_probe(struct platform_device *pdev) return ret; } + pm_runtime_set_autosuspend_delay(&pdev->dev, I2C_PM_TIMEOUT); + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_get_noresume(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + temp = readl(lpi2c_imx->base + LPI2C_PARAM); lpi2c_imx->txfifosize = 1 << (temp & 0x0f); lpi2c_imx->rxfifosize = 1 << ((temp >> 8) & 0x0f); - clk_disable(lpi2c_imx->clk); - ret = i2c_add_adapter(&lpi2c_imx->adapter); if (ret) - goto clk_unprepare; + goto rpm_disable; + + pm_runtime_mark_last_busy(&pdev->dev); + pm_runtime_put_autosuspend(&pdev->dev); dev_info(&lpi2c_imx->adapter.dev, "LPI2C adapter registered\n"); return 0; -clk_unprepare: - clk_unprepare(lpi2c_imx->clk); +rpm_disable: + pm_runtime_put(&pdev->dev); + pm_runtime_disable(&pdev->dev); + pm_runtime_dont_use_autosuspend(&pdev->dev); return ret; } @@ -632,28 +646,48 @@ static int lpi2c_imx_remove(struct platform_device *pdev) i2c_del_adapter(&lpi2c_imx->adapter); - clk_unprepare(lpi2c_imx->clk); + pm_runtime_disable(&pdev->dev); + pm_runtime_dont_use_autosuspend(&pdev->dev); return 0; } #ifdef CONFIG_PM_SLEEP -static int lpi2c_imx_suspend(struct device *dev) +static int lpi2c_runtime_suspend(struct device *dev) { + struct lpi2c_imx_struct *lpi2c_imx = dev_get_drvdata(dev); + + clk_disable_unprepare(lpi2c_imx->clk); pinctrl_pm_select_sleep_state(dev); return 0; } -static int lpi2c_imx_resume(struct device *dev) +static int lpi2c_runtime_resume(struct device *dev) { + struct lpi2c_imx_struct *lpi2c_imx = dev_get_drvdata(dev); + int ret; + pinctrl_pm_select_default_state(dev); + ret = clk_prepare_enable(lpi2c_imx->clk); + if (ret) { + dev_err(dev, "failed to enable I2C clock, ret=%d\n", ret); + return ret; + } return 0; } -#endif -static SIMPLE_DEV_PM_OPS(imx_lpi2c_pm, lpi2c_imx_suspend, lpi2c_imx_resume); +static const struct dev_pm_ops lpi2c_pm_ops = { + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, + pm_runtime_force_resume) + SET_RUNTIME_PM_OPS(lpi2c_runtime_suspend, + lpi2c_runtime_resume, NULL) +}; +#define IMX_LPI2C_PM (&lpi2c_pm_ops) +#else +#define IMX_LPI2C_PM NULL +#endif static struct platform_driver lpi2c_imx_driver = { .probe = lpi2c_imx_probe, @@ -661,7 +695,7 @@ static struct platform_driver lpi2c_imx_driver = { .driver = { .name = DRIVER_NAME, .of_match_table = lpi2c_imx_of_match, - .pm = &imx_lpi2c_pm, + .pm = IMX_LPI2C_PM, }, }; diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c index f96830f..9995577 100644 --- a/drivers/i2c/busses/i2c-imx.c +++ b/drivers/i2c/busses/i2c-imx.c @@ -37,6 +37,7 @@ #include <linux/dmapool.h> #include <linux/err.h> #include <linux/errno.h> +#include <linux/gpio/consumer.h> #include <linux/i2c.h> #include <linux/init.h> #include <linux/interrupt.h> @@ -46,7 +47,6 @@ #include <linux/of.h> #include <linux/of_device.h> #include <linux/of_dma.h> -#include <linux/of_gpio.h> #include <linux/pinctrl/consumer.h> #include <linux/platform_data/i2c-imx.h> #include <linux/platform_device.h> @@ -1006,26 +1006,26 @@ static int i2c_imx_init_recovery_info(struct imx_i2c_struct *i2c_imx, PINCTRL_STATE_DEFAULT); i2c_imx->pinctrl_pins_gpio = pinctrl_lookup_state(i2c_imx->pinctrl, "gpio"); - rinfo->sda_gpio = of_get_named_gpio(pdev->dev.of_node, "sda-gpios", 0); - rinfo->scl_gpio = of_get_named_gpio(pdev->dev.of_node, "scl-gpios", 0); + rinfo->sda_gpiod = devm_gpiod_get(&pdev->dev, "sda", GPIOD_IN); + rinfo->scl_gpiod = devm_gpiod_get(&pdev->dev, "scl", GPIOD_OUT_HIGH); - if (rinfo->sda_gpio == -EPROBE_DEFER || - rinfo->scl_gpio == -EPROBE_DEFER) { + if (PTR_ERR(rinfo->sda_gpiod) == -EPROBE_DEFER || + PTR_ERR(rinfo->scl_gpiod) == -EPROBE_DEFER) { return -EPROBE_DEFER; - } else if (!gpio_is_valid(rinfo->sda_gpio) || - !gpio_is_valid(rinfo->scl_gpio) || + } else if (IS_ERR(rinfo->sda_gpiod) || + IS_ERR(rinfo->scl_gpiod) || IS_ERR(i2c_imx->pinctrl_pins_default) || IS_ERR(i2c_imx->pinctrl_pins_gpio)) { dev_dbg(&pdev->dev, "recovery information incomplete\n"); return 0; } - dev_dbg(&pdev->dev, "using scl-gpio %d and sda-gpio %d for recovery\n", - rinfo->scl_gpio, rinfo->sda_gpio); + dev_dbg(&pdev->dev, "using scl%s for recovery\n", + rinfo->sda_gpiod ? ",sda" : ""); rinfo->prepare_recovery = i2c_imx_prepare_recovery; rinfo->unprepare_recovery = i2c_imx_unprepare_recovery; - rinfo->recover_bus = i2c_generic_gpio_recovery; + rinfo->recover_bus = i2c_generic_scl_recovery; i2c_imx->adapter.bus_recovery_info = rinfo; return 0; diff --git a/drivers/i2c/busses/i2c-ismt.c b/drivers/i2c/busses/i2c-ismt.c index b51adff..0d1c3ec 100644 --- a/drivers/i2c/busses/i2c-ismt.c +++ b/drivers/i2c/busses/i2c-ismt.c @@ -172,7 +172,7 @@ struct ismt_priv { dma_addr_t io_rng_dma; /* descriptor HW base addr */ u8 head; /* ring buffer head pointer */ struct completion cmp; /* interrupt completion */ - u8 dma_buffer[I2C_SMBUS_BLOCK_MAX + 1]; /* temp R/W data buffer */ + u8 buffer[I2C_SMBUS_BLOCK_MAX + 16]; /* temp R/W data buffer */ }; /** @@ -320,10 +320,12 @@ static int ismt_process_desc(const struct ismt_desc *desc, struct ismt_priv *priv, int size, char read_write) { - u8 *dma_buffer = priv->dma_buffer; + u8 *dma_buffer = PTR_ALIGN(&priv->buffer[0], 16); dev_dbg(&priv->pci_dev->dev, "Processing completed descriptor\n"); __ismt_desc_dump(&priv->pci_dev->dev, desc); + ismt_gen_reg_dump(priv); + ismt_mstr_reg_dump(priv); if (desc->status & ISMT_DESC_SCS) { if (read_write == I2C_SMBUS_WRITE && @@ -393,11 +395,12 @@ static int ismt_access(struct i2c_adapter *adap, u16 addr, struct ismt_desc *desc; struct ismt_priv *priv = i2c_get_adapdata(adap); struct device *dev = &priv->pci_dev->dev; + u8 *dma_buffer = PTR_ALIGN(&priv->buffer[0], 16); desc = &priv->hw[priv->head]; /* Initialize the DMA buffer */ - memset(priv->dma_buffer, 0, sizeof(priv->dma_buffer)); + memset(priv->buffer, 0, sizeof(priv->buffer)); /* Initialize the descriptor */ memset(desc, 0, sizeof(struct ismt_desc)); @@ -446,8 +449,8 @@ static int ismt_access(struct i2c_adapter *adap, u16 addr, desc->wr_len_cmd = 2; dma_size = 2; dma_direction = DMA_TO_DEVICE; - priv->dma_buffer[0] = command; - priv->dma_buffer[1] = data->byte; + dma_buffer[0] = command; + dma_buffer[1] = data->byte; } else { /* Read Byte */ dev_dbg(dev, "I2C_SMBUS_BYTE_DATA: READ\n"); @@ -466,9 +469,9 @@ static int ismt_access(struct i2c_adapter *adap, u16 addr, desc->wr_len_cmd = 3; dma_size = 3; dma_direction = DMA_TO_DEVICE; - priv->dma_buffer[0] = command; - priv->dma_buffer[1] = data->word & 0xff; - priv->dma_buffer[2] = data->word >> 8; + dma_buffer[0] = command; + dma_buffer[1] = data->word & 0xff; + dma_buffer[2] = data->word >> 8; } else { /* Read Word */ dev_dbg(dev, "I2C_SMBUS_WORD_DATA: READ\n"); @@ -486,9 +489,9 @@ static int ismt_access(struct i2c_adapter *adap, u16 addr, desc->rd_len = 2; dma_size = 3; dma_direction = DMA_BIDIRECTIONAL; - priv->dma_buffer[0] = command; - priv->dma_buffer[1] = data->word & 0xff; - priv->dma_buffer[2] = data->word >> 8; + dma_buffer[0] = command; + dma_buffer[1] = data->word & 0xff; + dma_buffer[2] = data->word >> 8; break; case I2C_SMBUS_BLOCK_DATA: @@ -499,8 +502,8 @@ static int ismt_access(struct i2c_adapter *adap, u16 addr, dma_direction = DMA_TO_DEVICE; desc->wr_len_cmd = dma_size; desc->control |= ISMT_DESC_BLK; - priv->dma_buffer[0] = command; - memcpy(&priv->dma_buffer[1], &data->block[1], dma_size - 1); + dma_buffer[0] = command; + memcpy(&dma_buffer[1], &data->block[1], dma_size - 1); } else { /* Block Read */ dev_dbg(dev, "I2C_SMBUS_BLOCK_DATA: READ\n"); @@ -527,8 +530,8 @@ static int ismt_access(struct i2c_adapter *adap, u16 addr, dma_direction = DMA_TO_DEVICE; desc->wr_len_cmd = dma_size; desc->control |= ISMT_DESC_I2C; - priv->dma_buffer[0] = command; - memcpy(&priv->dma_buffer[1], &data->block[1], dma_size - 1); + dma_buffer[0] = command; + memcpy(&dma_buffer[1], &data->block[1], dma_size - 1); } else { /* i2c Block Read */ dev_dbg(dev, "I2C_SMBUS_I2C_BLOCK_DATA: READ\n"); @@ -557,23 +560,22 @@ static int ismt_access(struct i2c_adapter *adap, u16 addr, if (dma_size != 0) { dev_dbg(dev, " dev=%p\n", dev); dev_dbg(dev, " data=%p\n", data); - dev_dbg(dev, " dma_buffer=%p\n", priv->dma_buffer); + dev_dbg(dev, " dma_buffer=%p\n", dma_buffer); dev_dbg(dev, " dma_size=%d\n", dma_size); dev_dbg(dev, " dma_direction=%d\n", dma_direction); dma_addr = dma_map_single(dev, - priv->dma_buffer, + dma_buffer, dma_size, dma_direction); if (dma_mapping_error(dev, dma_addr)) { dev_err(dev, "Error in mapping dma buffer %p\n", - priv->dma_buffer); + dma_buffer); return -EIO; } - dev_dbg(dev, " dma_addr = 0x%016llX\n", - (unsigned long long)dma_addr); + dev_dbg(dev, " dma_addr = %pad\n", &dma_addr); desc->dptr_low = lower_32_bits(dma_addr); desc->dptr_high = upper_32_bits(dma_addr); diff --git a/drivers/i2c/busses/i2c-meson.c b/drivers/i2c/busses/i2c-meson.c index 88d15b9..90f5d04 100644 --- a/drivers/i2c/busses/i2c-meson.c +++ b/drivers/i2c/busses/i2c-meson.c @@ -16,6 +16,7 @@ #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> +#include <linux/of_device.h> #include <linux/platform_device.h> #include <linux/types.h> @@ -57,6 +58,10 @@ enum { STATE_WRITE, }; +struct meson_i2c_data { + unsigned char div_factor; +}; + /** * struct meson_i2c - Meson I2C device private data * @@ -64,7 +69,6 @@ enum { * @dev: Pointer to device structure * @regs: Base address of the device memory mapped registers * @clk: Pointer to clock structure - * @irq: IRQ number * @msg: Pointer to the current I2C message * @state: Current state in the driver state machine * @last: Flag set for the last message in the transfer @@ -75,6 +79,7 @@ enum { * @done: Completion used to wait for transfer termination * @tokens: Sequence of tokens to be written to the device * @num_tokens: Number of tokens + * @data: Pointer to the controlller's platform data */ struct meson_i2c { struct i2c_adapter adap; @@ -93,6 +98,8 @@ struct meson_i2c { struct completion done; u32 tokens[2]; int num_tokens; + + const struct meson_i2c_data *data; }; static void meson_i2c_set_mask(struct meson_i2c *i2c, int reg, u32 mask, @@ -128,7 +135,7 @@ static void meson_i2c_set_clk_div(struct meson_i2c *i2c, unsigned int freq) unsigned long clk_rate = clk_get_rate(i2c->clk); unsigned int div; - div = DIV_ROUND_UP(clk_rate, freq * 4); + div = DIV_ROUND_UP(clk_rate, freq * i2c->data->div_factor); /* clock divider has 12 bits */ if (div >= (1 << 12)) { @@ -376,6 +383,9 @@ static int meson_i2c_probe(struct platform_device *pdev) spin_lock_init(&i2c->lock); init_completion(&i2c->done); + i2c->data = (const struct meson_i2c_data *) + of_device_get_match_data(&pdev->dev); + i2c->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(i2c->clk)) { dev_err(&pdev->dev, "can't get device clock\n"); @@ -440,11 +450,25 @@ static int meson_i2c_remove(struct platform_device *pdev) return 0; } +static const struct meson_i2c_data i2c_meson6_data = { + .div_factor = 4, +}; + +static const struct meson_i2c_data i2c_gxbb_data = { + .div_factor = 4, +}; + +static const struct meson_i2c_data i2c_axg_data = { + .div_factor = 3, +}; + static const struct of_device_id meson_i2c_match[] = { - { .compatible = "amlogic,meson6-i2c" }, - { .compatible = "amlogic,meson-gxbb-i2c" }, - { }, + { .compatible = "amlogic,meson6-i2c", .data = &i2c_meson6_data }, + { .compatible = "amlogic,meson-gxbb-i2c", .data = &i2c_gxbb_data }, + { .compatible = "amlogic,meson-axg-i2c", .data = &i2c_axg_data }, + {}, }; + MODULE_DEVICE_TABLE(of, meson_i2c_match); static struct platform_driver meson_i2c_driver = { diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c index 950a9d7..d94f05c 100644 --- a/drivers/i2c/busses/i2c-mpc.c +++ b/drivers/i2c/busses/i2c-mpc.c @@ -78,9 +78,7 @@ struct mpc_i2c_divider { }; struct mpc_i2c_data { - void (*setup)(struct device_node *node, struct mpc_i2c *i2c, - u32 clock, u32 prescaler); - u32 prescaler; + void (*setup)(struct device_node *node, struct mpc_i2c *i2c, u32 clock); }; static inline void writeccr(struct mpc_i2c *i2c, u32 x) @@ -201,7 +199,7 @@ static const struct mpc_i2c_divider mpc_i2c_dividers_52xx[] = { }; static int mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock, - int prescaler, u32 *real_clk) + u32 *real_clk) { const struct mpc_i2c_divider *div = NULL; unsigned int pvr = mfspr(SPRN_PVR); @@ -236,7 +234,7 @@ static int mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock, static void mpc_i2c_setup_52xx(struct device_node *node, struct mpc_i2c *i2c, - u32 clock, u32 prescaler) + u32 clock) { int ret, fdr; @@ -246,7 +244,7 @@ static void mpc_i2c_setup_52xx(struct device_node *node, return; } - ret = mpc_i2c_get_fdr_52xx(node, clock, prescaler, &i2c->real_clk); + ret = mpc_i2c_get_fdr_52xx(node, clock, &i2c->real_clk); fdr = (ret >= 0) ? ret : 0x3f; /* backward compatibility */ writeb(fdr & 0xff, i2c->base + MPC_I2C_FDR); @@ -258,7 +256,7 @@ static void mpc_i2c_setup_52xx(struct device_node *node, #else /* !(CONFIG_PPC_MPC52xx || CONFIG_PPC_MPC512x) */ static void mpc_i2c_setup_52xx(struct device_node *node, struct mpc_i2c *i2c, - u32 clock, u32 prescaler) + u32 clock) { } #endif /* CONFIG_PPC_MPC52xx || CONFIG_PPC_MPC512x */ @@ -266,7 +264,7 @@ static void mpc_i2c_setup_52xx(struct device_node *node, #ifdef CONFIG_PPC_MPC512x static void mpc_i2c_setup_512x(struct device_node *node, struct mpc_i2c *i2c, - u32 clock, u32 prescaler) + u32 clock) { struct device_node *node_ctrl; void __iomem *ctrl; @@ -289,12 +287,12 @@ static void mpc_i2c_setup_512x(struct device_node *node, } /* The clock setup for the 52xx works also fine for the 512x */ - mpc_i2c_setup_52xx(node, i2c, clock, prescaler); + mpc_i2c_setup_52xx(node, i2c, clock); } #else /* CONFIG_PPC_MPC512x */ static void mpc_i2c_setup_512x(struct device_node *node, struct mpc_i2c *i2c, - u32 clock, u32 prescaler) + u32 clock) { } #endif /* CONFIG_PPC_MPC512x */ @@ -332,14 +330,18 @@ static u32 mpc_i2c_get_sec_cfg_8xxx(void) if (prop) { /* * Map and check POR Device Status Register 2 - * (PORDEVSR2) at 0xE0014 + * (PORDEVSR2) at 0xE0014. Note than while MPC8533 + * and MPC8544 indicate SEC frequency ratio + * configuration as bit 26 in PORDEVSR2, other MPC8xxx + * parts may store it differently or may not have it + * at all. */ reg = ioremap(get_immrbase() + *prop + 0x14, 0x4); if (!reg) printk(KERN_ERR "Error: couldn't map PORDEVSR2\n"); else - val = in_be32(reg) & 0x00000080; /* sec-cfg */ + val = in_be32(reg) & 0x00000020; /* sec-cfg */ iounmap(reg); } } @@ -350,7 +352,11 @@ static u32 mpc_i2c_get_sec_cfg_8xxx(void) static u32 mpc_i2c_get_prescaler_8xxx(void) { - /* mpc83xx and mpc82xx all have prescaler 1 */ + /* + * According to the AN2919 all MPC824x have prescaler 1, while MPC83xx + * may have prescaler 1, 2, or 3, depending on the power-on + * configuration. + */ u32 prescaler = 1; /* mpc85xx */ @@ -367,6 +373,10 @@ static u32 mpc_i2c_get_prescaler_8xxx(void) || (SVR_SOC_VER(svr) == SVR_8610)) /* the above 85xx SoCs have prescaler 1 */ prescaler = 1; + else if ((SVR_SOC_VER(svr) == SVR_8533) + || (SVR_SOC_VER(svr) == SVR_8544)) + /* the above 85xx SoCs have prescaler 3 or 2 */ + prescaler = mpc_i2c_get_sec_cfg_8xxx() ? 3 : 2; else /* all the other 85xx have prescaler 2 */ prescaler = 2; @@ -376,9 +386,10 @@ static u32 mpc_i2c_get_prescaler_8xxx(void) } static int mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock, - u32 prescaler, u32 *real_clk) + u32 *real_clk) { const struct mpc_i2c_divider *div = NULL; + u32 prescaler = mpc_i2c_get_prescaler_8xxx(); u32 divider; int i; @@ -388,12 +399,6 @@ static int mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock, return -EINVAL; } - /* Determine proper divider value */ - if (of_device_is_compatible(node, "fsl,mpc8544-i2c")) - prescaler = mpc_i2c_get_sec_cfg_8xxx() ? 3 : 2; - if (!prescaler) - prescaler = mpc_i2c_get_prescaler_8xxx(); - divider = fsl_get_sys_freq() / clock / prescaler; pr_debug("I2C: src_clock=%d clock=%d divider=%d\n", @@ -415,7 +420,7 @@ static int mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock, static void mpc_i2c_setup_8xxx(struct device_node *node, struct mpc_i2c *i2c, - u32 clock, u32 prescaler) + u32 clock) { int ret, fdr; @@ -426,7 +431,7 @@ static void mpc_i2c_setup_8xxx(struct device_node *node, return; } - ret = mpc_i2c_get_fdr_8xxx(node, clock, prescaler, &i2c->real_clk); + ret = mpc_i2c_get_fdr_8xxx(node, clock, &i2c->real_clk); fdr = (ret >= 0) ? ret : 0x1031; /* backward compatibility */ writeb(fdr & 0xff, i2c->base + MPC_I2C_FDR); @@ -440,7 +445,7 @@ static void mpc_i2c_setup_8xxx(struct device_node *node, #else /* !CONFIG_FSL_SOC */ static void mpc_i2c_setup_8xxx(struct device_node *node, struct mpc_i2c *i2c, - u32 clock, u32 prescaler) + u32 clock) { } #endif /* CONFIG_FSL_SOC */ @@ -711,11 +716,11 @@ static int fsl_i2c_probe(struct platform_device *op) if (match->data) { const struct mpc_i2c_data *data = match->data; - data->setup(op->dev.of_node, i2c, clock, data->prescaler); + data->setup(op->dev.of_node, i2c, clock); } else { /* Backwards compatibility */ if (of_get_property(op->dev.of_node, "dfsrr", NULL)) - mpc_i2c_setup_8xxx(op->dev.of_node, i2c, clock, 0); + mpc_i2c_setup_8xxx(op->dev.of_node, i2c, clock); } prop = of_get_property(op->dev.of_node, "fsl,timeout", &plen); @@ -813,12 +818,10 @@ static const struct mpc_i2c_data mpc_i2c_data_8313 = { static const struct mpc_i2c_data mpc_i2c_data_8543 = { .setup = mpc_i2c_setup_8xxx, - .prescaler = 2, }; static const struct mpc_i2c_data mpc_i2c_data_8544 = { .setup = mpc_i2c_setup_8xxx, - .prescaler = 3, }; static const struct of_device_id mpc_i2c_of_match[] = { diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c index 09d288c..cf23a74 100644 --- a/drivers/i2c/busses/i2c-mt65xx.c +++ b/drivers/i2c/busses/i2c-mt65xx.c @@ -61,6 +61,7 @@ #define I2C_DMA_HARD_RST 0x0002 #define I2C_DMA_4G_MODE 0x0001 +#define I2C_DEFAULT_CLK_DIV 5 #define I2C_DEFAULT_SPEED 100000 /* hz */ #define MAX_FS_MODE_SPEED 400000 #define MAX_HS_MODE_SPEED 3400000 @@ -127,6 +128,7 @@ enum I2C_REGS_OFFSET { OFFSET_DEBUGSTAT = 0x64, OFFSET_DEBUGCTRL = 0x68, OFFSET_TRANSFER_LEN_AUX = 0x6c, + OFFSET_CLOCK_DIV = 0x70, }; struct mtk_i2c_compatible { @@ -136,6 +138,7 @@ struct mtk_i2c_compatible { unsigned char auto_restart: 1; unsigned char aux_len_reg: 1; unsigned char support_33bits: 1; + unsigned char timing_adjust: 1; }; struct mtk_i2c { @@ -176,6 +179,15 @@ static const struct i2c_adapter_quirks mt7622_i2c_quirks = { .max_num_msgs = 255, }; +static const struct mtk_i2c_compatible mt2712_compat = { + .pmic_i2c = 0, + .dcm = 1, + .auto_restart = 1, + .aux_len_reg = 1, + .support_33bits = 1, + .timing_adjust = 1, +}; + static const struct mtk_i2c_compatible mt6577_compat = { .quirks = &mt6577_i2c_quirks, .pmic_i2c = 0, @@ -183,6 +195,7 @@ static const struct mtk_i2c_compatible mt6577_compat = { .auto_restart = 0, .aux_len_reg = 0, .support_33bits = 0, + .timing_adjust = 0, }; static const struct mtk_i2c_compatible mt6589_compat = { @@ -192,6 +205,7 @@ static const struct mtk_i2c_compatible mt6589_compat = { .auto_restart = 0, .aux_len_reg = 0, .support_33bits = 0, + .timing_adjust = 0, }; static const struct mtk_i2c_compatible mt7622_compat = { @@ -201,6 +215,7 @@ static const struct mtk_i2c_compatible mt7622_compat = { .auto_restart = 1, .aux_len_reg = 1, .support_33bits = 0, + .timing_adjust = 0, }; static const struct mtk_i2c_compatible mt8173_compat = { @@ -209,9 +224,11 @@ static const struct mtk_i2c_compatible mt8173_compat = { .auto_restart = 1, .aux_len_reg = 1, .support_33bits = 1, + .timing_adjust = 0, }; static const struct of_device_id mtk_i2c_of_match[] = { + { .compatible = "mediatek,mt2712-i2c", .data = &mt2712_compat }, { .compatible = "mediatek,mt6577-i2c", .data = &mt6577_compat }, { .compatible = "mediatek,mt6589-i2c", .data = &mt6589_compat }, { .compatible = "mediatek,mt7622-i2c", .data = &mt7622_compat }, @@ -271,6 +288,9 @@ static void mtk_i2c_init_hw(struct mtk_i2c *i2c) if (i2c->dev_comp->dcm) writew(I2C_DCM_DISABLE, i2c->base + OFFSET_DCM_EN); + if (i2c->dev_comp->timing_adjust) + writew(I2C_DEFAULT_CLK_DIV - 1, i2c->base + OFFSET_CLOCK_DIV); + writew(i2c->timing_reg, i2c->base + OFFSET_TIMING); writew(i2c->high_speed_reg, i2c->base + OFFSET_HS); @@ -725,10 +745,6 @@ static int mtk_i2c_probe(struct platform_device *pdev) if (!i2c) return -ENOMEM; - ret = mtk_i2c_parse_dt(pdev->dev.of_node, i2c); - if (ret) - return -EINVAL; - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); i2c->base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(i2c->base)) @@ -759,6 +775,13 @@ static int mtk_i2c_probe(struct platform_device *pdev) i2c->adap.timeout = 2 * HZ; i2c->adap.retries = 1; + ret = mtk_i2c_parse_dt(pdev->dev.of_node, i2c); + if (ret) + return -EINVAL; + + if (i2c->dev_comp->timing_adjust) + i2c->clk_src_div *= I2C_DEFAULT_CLK_DIV; + if (i2c->have_pmic && !i2c->dev_comp->pmic_i2c) return -EINVAL; @@ -838,10 +861,19 @@ static int mtk_i2c_remove(struct platform_device *pdev) #ifdef CONFIG_PM_SLEEP static int mtk_i2c_resume(struct device *dev) { + int ret; struct mtk_i2c *i2c = dev_get_drvdata(dev); + ret = mtk_i2c_clock_enable(i2c); + if (ret) { + dev_err(dev, "clock enable failed!\n"); + return ret; + } + mtk_i2c_init_hw(i2c); + mtk_i2c_clock_disable(i2c); + return 0; } #endif diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c index a832c45..440fe4a 100644 --- a/drivers/i2c/busses/i2c-mv64xxx.c +++ b/drivers/i2c/busses/i2c-mv64xxx.c @@ -135,6 +135,7 @@ struct mv64xxx_i2c_data { u32 freq_m; u32 freq_n; struct clk *clk; + struct clk *reg_clk; wait_queue_head_t waitq; spinlock_t lock; struct i2c_msg *msg; @@ -894,13 +895,20 @@ mv64xxx_i2c_probe(struct platform_device *pd) init_waitqueue_head(&drv_data->waitq); spin_lock_init(&drv_data->lock); - /* Not all platforms have a clk */ + /* Not all platforms have clocks */ drv_data->clk = devm_clk_get(&pd->dev, NULL); if (IS_ERR(drv_data->clk) && PTR_ERR(drv_data->clk) == -EPROBE_DEFER) return -EPROBE_DEFER; if (!IS_ERR(drv_data->clk)) clk_prepare_enable(drv_data->clk); + drv_data->reg_clk = devm_clk_get(&pd->dev, "reg"); + if (IS_ERR(drv_data->reg_clk) && + PTR_ERR(drv_data->reg_clk) == -EPROBE_DEFER) + return -EPROBE_DEFER; + if (!IS_ERR(drv_data->reg_clk)) + clk_prepare_enable(drv_data->reg_clk); + drv_data->irq = platform_get_irq(pd, 0); if (pdata) { @@ -950,9 +958,8 @@ exit_free_irq: exit_reset: reset_control_assert(drv_data->rstc); exit_clk: - /* Not all platforms have a clk */ - if (!IS_ERR(drv_data->clk)) - clk_disable_unprepare(drv_data->clk); + clk_disable_unprepare(drv_data->reg_clk); + clk_disable_unprepare(drv_data->clk); return rc; } @@ -965,9 +972,8 @@ mv64xxx_i2c_remove(struct platform_device *dev) i2c_del_adapter(&drv_data->adapter); free_irq(drv_data->irq, drv_data); reset_control_assert(drv_data->rstc); - /* Not all platforms have a clk */ - if (!IS_ERR(drv_data->clk)) - clk_disable_unprepare(drv_data->clk); + clk_disable_unprepare(drv_data->reg_clk); + clk_disable_unprepare(drv_data->clk); return 0; } diff --git a/drivers/i2c/busses/i2c-mxs.c b/drivers/i2c/busses/i2c-mxs.c index d4e8f19..e617bd6 100644 --- a/drivers/i2c/busses/i2c-mxs.c +++ b/drivers/i2c/busses/i2c-mxs.c @@ -181,7 +181,7 @@ static int mxs_i2c_dma_setup_xfer(struct i2c_adapter *adap, struct mxs_i2c_dev *i2c = i2c_get_adapdata(adap); if (msg->flags & I2C_M_RD) { - i2c->dma_read = 1; + i2c->dma_read = true; i2c->addr_data = (msg->addr << 1) | I2C_SMBUS_READ; /* @@ -239,7 +239,7 @@ static int mxs_i2c_dma_setup_xfer(struct i2c_adapter *adap, goto read_init_dma_fail; } } else { - i2c->dma_read = 0; + i2c->dma_read = false; i2c->addr_data = (msg->addr << 1) | I2C_SMBUS_WRITE; /* diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c index 15d764a..4159ebc 100644 --- a/drivers/i2c/busses/i2c-rcar.c +++ b/drivers/i2c/busses/i2c-rcar.c @@ -62,7 +62,7 @@ #define MIE (1 << 3) /* master if enable */ #define TSBE (1 << 2) #define FSB (1 << 1) /* force stop bit */ -#define ESG (1 << 0) /* en startbit gen */ +#define ESG (1 << 0) /* enable start bit gen */ /* ICSSR (also for ICSIER) */ #define GCAR (1 << 6) /* general call received */ @@ -132,6 +132,7 @@ struct rcar_i2c_priv { int pos; u32 icccr; u32 flags; + u8 recovery_icmcr; /* protected by adapter lock */ enum rcar_i2c_type devtype; struct i2c_client *slave; @@ -158,6 +159,46 @@ static u32 rcar_i2c_read(struct rcar_i2c_priv *priv, int reg) return readl(priv->io + reg); } +static int rcar_i2c_get_scl(struct i2c_adapter *adap) +{ + struct rcar_i2c_priv *priv = i2c_get_adapdata(adap); + + return !!(rcar_i2c_read(priv, ICMCR) & FSCL); + +}; + +static void rcar_i2c_set_scl(struct i2c_adapter *adap, int val) +{ + struct rcar_i2c_priv *priv = i2c_get_adapdata(adap); + + if (val) + priv->recovery_icmcr |= FSCL; + else + priv->recovery_icmcr &= ~FSCL; + + rcar_i2c_write(priv, ICMCR, priv->recovery_icmcr); +}; + +/* No get_sda, because the HW only reports its bus free logic, not SDA itself */ + +static void rcar_i2c_set_sda(struct i2c_adapter *adap, int val) +{ + struct rcar_i2c_priv *priv = i2c_get_adapdata(adap); + + if (val) + priv->recovery_icmcr |= FSDA; + else + priv->recovery_icmcr &= ~FSDA; + + rcar_i2c_write(priv, ICMCR, priv->recovery_icmcr); +}; + +static struct i2c_bus_recovery_info rcar_i2c_bri = { + .get_scl = rcar_i2c_get_scl, + .set_scl = rcar_i2c_set_scl, + .set_sda = rcar_i2c_set_sda, + .recover_bus = i2c_generic_scl_recovery, +}; static void rcar_i2c_init(struct rcar_i2c_priv *priv) { /* reset master mode */ @@ -170,7 +211,7 @@ static void rcar_i2c_init(struct rcar_i2c_priv *priv) static int rcar_i2c_bus_barrier(struct rcar_i2c_priv *priv) { - int i; + int i, ret; for (i = 0; i < LOOP_TIMEOUT; i++) { /* make sure that bus is not busy */ @@ -179,7 +220,15 @@ static int rcar_i2c_bus_barrier(struct rcar_i2c_priv *priv) udelay(1); } - return -EBUSY; + /* Waiting did not help, try to recover */ + priv->recovery_icmcr = MDBS | OBPC | FSDA | FSCL; + ret = i2c_recover_bus(&priv->adap); + + /* No failure when recovering, so check bus busy bit again */ + if (ret == 0) + ret = (rcar_i2c_read(priv, ICMCR) & FSDA) ? -EBUSY : 0; + + return ret; } static int rcar_i2c_clock_calculate(struct rcar_i2c_priv *priv, struct i2c_timings *t) @@ -282,7 +331,7 @@ static void rcar_i2c_prepare_msg(struct rcar_i2c_priv *priv) rcar_i2c_write(priv, ICMAR, (priv->msg->addr << 1) | read); /* - * We don't have a testcase but the HW engineers say that the write order + * We don't have a test case but the HW engineers say that the write order * of ICMSR and ICMCR depends on whether we issue START or REP_START. Since * it didn't cause a drawback for me, let's rather be safe than sorry. */ @@ -359,7 +408,7 @@ static void rcar_i2c_dma(struct rcar_i2c_priv *priv) int len; /* Do not use DMA if it's not available or for messages < 8 bytes */ - if (IS_ERR(chan) || msg->len < 8) + if (IS_ERR(chan) || msg->len < 8 || !(msg->flags & I2C_M_DMA_SAFE)) return; if (read) { @@ -440,7 +489,7 @@ static void rcar_i2c_irq_send(struct rcar_i2c_priv *priv, u32 msr) /* * Try to use DMA to transmit the rest of the data if - * address transfer pashe just finished. + * address transfer phase just finished. */ if (msr & MAT) rcar_i2c_dma(priv); @@ -851,6 +900,7 @@ static int rcar_i2c_probe(struct platform_device *pdev) adap->retries = 3; adap->dev.parent = dev; adap->dev.of_node = dev->of_node; + adap->bus_recovery_info = &rcar_i2c_bri; i2c_set_adapdata(adap, priv); strlcpy(adap->name, pdev->name, sizeof(adap->name)); diff --git a/drivers/i2c/busses/i2c-rk3x.c b/drivers/i2c/busses/i2c-rk3x.c index fe23457..e1a18d9 100644 --- a/drivers/i2c/busses/i2c-rk3x.c +++ b/drivers/i2c/busses/i2c-rk3x.c @@ -161,6 +161,7 @@ enum rk3x_i2c_state { }; /** + * struct rk3x_i2c_soc_data: * @grf_offset: offset inside the grf regmap for setting the i2c type * @calc_timings: Callback function for i2c timing information calculated */ @@ -194,7 +195,7 @@ struct rk3x_i2c_soc_data { struct rk3x_i2c { struct i2c_adapter adap; struct device *dev; - struct rk3x_i2c_soc_data *soc_data; + const struct rk3x_i2c_soc_data *soc_data; /* Hardware resources */ void __iomem *regs; @@ -1164,27 +1165,27 @@ static const struct rk3x_i2c_soc_data rk3399_soc_data = { static const struct of_device_id rk3x_i2c_match[] = { { .compatible = "rockchip,rv1108-i2c", - .data = (void *)&rv1108_soc_data + .data = &rv1108_soc_data }, { .compatible = "rockchip,rk3066-i2c", - .data = (void *)&rk3066_soc_data + .data = &rk3066_soc_data }, { .compatible = "rockchip,rk3188-i2c", - .data = (void *)&rk3188_soc_data + .data = &rk3188_soc_data }, { .compatible = "rockchip,rk3228-i2c", - .data = (void *)&rk3228_soc_data + .data = &rk3228_soc_data }, { .compatible = "rockchip,rk3288-i2c", - .data = (void *)&rk3288_soc_data + .data = &rk3288_soc_data }, { .compatible = "rockchip,rk3399-i2c", - .data = (void *)&rk3399_soc_data + .data = &rk3399_soc_data }, {}, }; @@ -1207,7 +1208,7 @@ static int rk3x_i2c_probe(struct platform_device *pdev) return -ENOMEM; match = of_match_node(rk3x_i2c_match, np); - i2c->soc_data = (struct rk3x_i2c_soc_data *)match->data; + i2c->soc_data = match->data; /* use common interface to get I2C timing properties */ i2c_parse_fw_timings(&pdev->dev, &i2c->t, true); diff --git a/drivers/i2c/busses/i2c-sh_mobile.c b/drivers/i2c/busses/i2c-sh_mobile.c index c03acdf..d856bc2 100644 --- a/drivers/i2c/busses/i2c-sh_mobile.c +++ b/drivers/i2c/busses/i2c-sh_mobile.c @@ -40,21 +40,21 @@ /* BUS: S A8 ACK P(*) */ /* IRQ: DTE WAIT */ /* ICIC: */ -/* ICCR: 0x94 0x90 */ +/* ICCR: 0x94 0x90 */ /* ICDR: A8 */ /* */ /* 1 byte transmit */ /* BUS: S A8 ACK D8(1) ACK P(*) */ /* IRQ: DTE WAIT WAIT */ /* ICIC: -DTE */ -/* ICCR: 0x94 0x90 */ +/* ICCR: 0x94 0x90 */ /* ICDR: A8 D8(1) */ /* */ /* 2 byte transmit */ /* BUS: S A8 ACK D8(1) ACK D8(2) ACK P(*) */ /* IRQ: DTE WAIT WAIT WAIT */ /* ICIC: -DTE */ -/* ICCR: 0x94 0x90 */ +/* ICCR: 0x94 0x90 */ /* ICDR: A8 D8(1) D8(2) */ /* */ /* 3 bytes or more, +---------+ gets repeated */ @@ -113,7 +113,6 @@ enum sh_mobile_i2c_op { OP_TX_FIRST, OP_TX, OP_TX_STOP, - OP_TX_STOP_DATA, OP_TX_TO_RX, OP_RX, OP_RX_STOP, @@ -145,11 +144,12 @@ struct sh_mobile_i2c_data { struct dma_chan *dma_rx; struct scatterlist sg; enum dma_data_direction dma_direction; + u8 *dma_buf; }; struct sh_mobile_dt_config { int clks_per_count; - void (*setup)(struct sh_mobile_i2c_data *pd); + int (*setup)(struct sh_mobile_i2c_data *pd); }; #define IIC_FLAG_HAS_ICIC67 (1 << 0) @@ -246,36 +246,10 @@ static u32 sh_mobile_i2c_icch(unsigned long count_khz, u32 tHIGH, u32 tf) return (((count_khz * (tHIGH + tf)) + 5000) / 10000); } -static int sh_mobile_i2c_init(struct sh_mobile_i2c_data *pd) +static int sh_mobile_i2c_check_timing(struct sh_mobile_i2c_data *pd) { - unsigned long i2c_clk_khz; - u32 tHIGH, tLOW, tf; - uint16_t max_val; - - /* Get clock rate after clock is enabled */ - clk_prepare_enable(pd->clk); - i2c_clk_khz = clk_get_rate(pd->clk) / 1000; - clk_disable_unprepare(pd->clk); - i2c_clk_khz /= pd->clks_per_count; - - if (pd->bus_speed == STANDARD_MODE) { - tLOW = 47; /* tLOW = 4.7 us */ - tHIGH = 40; /* tHD;STA = tHIGH = 4.0 us */ - tf = 3; /* tf = 0.3 us */ - } else if (pd->bus_speed == FAST_MODE) { - tLOW = 13; /* tLOW = 1.3 us */ - tHIGH = 6; /* tHD;STA = tHIGH = 0.6 us */ - tf = 3; /* tf = 0.3 us */ - } else { - dev_err(pd->dev, "unrecognized bus speed %lu Hz\n", - pd->bus_speed); - return -EINVAL; - } - - pd->iccl = sh_mobile_i2c_iccl(i2c_clk_khz, tLOW, tf); - pd->icch = sh_mobile_i2c_icch(i2c_clk_khz, tHIGH, tf); + u16 max_val = pd->flags & IIC_FLAG_HAS_ICIC67 ? 0x1ff : 0xff; - max_val = pd->flags & IIC_FLAG_HAS_ICIC67 ? 0x1ff : 0xff; if (pd->iccl > max_val || pd->icch > max_val) { dev_err(pd->dev, "timing values out of range: L/H=0x%x/0x%x\n", pd->iccl, pd->icch); @@ -298,35 +272,43 @@ static int sh_mobile_i2c_init(struct sh_mobile_i2c_data *pd) return 0; } -static void activate_ch(struct sh_mobile_i2c_data *pd) +static int sh_mobile_i2c_init(struct sh_mobile_i2c_data *pd) { - /* Wake up device and enable clock */ - pm_runtime_get_sync(pd->dev); - clk_prepare_enable(pd->clk); + unsigned long i2c_clk_khz; + u32 tHIGH, tLOW, tf; - /* Enable channel and configure rx ack */ - iic_set_clr(pd, ICCR, ICCR_ICE, 0); + i2c_clk_khz = clk_get_rate(pd->clk) / 1000 / pd->clks_per_count; - /* Mask all interrupts */ - iic_wr(pd, ICIC, 0); + if (pd->bus_speed == STANDARD_MODE) { + tLOW = 47; /* tLOW = 4.7 us */ + tHIGH = 40; /* tHD;STA = tHIGH = 4.0 us */ + tf = 3; /* tf = 0.3 us */ + } else if (pd->bus_speed == FAST_MODE) { + tLOW = 13; /* tLOW = 1.3 us */ + tHIGH = 6; /* tHD;STA = tHIGH = 0.6 us */ + tf = 3; /* tf = 0.3 us */ + } else { + dev_err(pd->dev, "unrecognized bus speed %lu Hz\n", + pd->bus_speed); + return -EINVAL; + } - /* Set the clock */ - iic_wr(pd, ICCL, pd->iccl & 0xff); - iic_wr(pd, ICCH, pd->icch & 0xff); + pd->iccl = sh_mobile_i2c_iccl(i2c_clk_khz, tLOW, tf); + pd->icch = sh_mobile_i2c_icch(i2c_clk_khz, tHIGH, tf); + + return sh_mobile_i2c_check_timing(pd); } -static void deactivate_ch(struct sh_mobile_i2c_data *pd) +static int sh_mobile_i2c_v2_init(struct sh_mobile_i2c_data *pd) { - /* Clear/disable interrupts */ - iic_wr(pd, ICSR, 0); - iic_wr(pd, ICIC, 0); + unsigned long clks_per_cycle; - /* Disable channel */ - iic_set_clr(pd, ICCR, 0, ICCR_ICE); + /* L = 5, H = 4, L + H = 9 */ + clks_per_cycle = clk_get_rate(pd->clk) / pd->bus_speed; + pd->iccl = DIV_ROUND_UP(clks_per_cycle * 5 / 9 - 1, pd->clks_per_count); + pd->icch = DIV_ROUND_UP(clks_per_cycle * 4 / 9 - 5, pd->clks_per_count); - /* Disable clock and mark device as idle */ - clk_disable_unprepare(pd->clk); - pm_runtime_put_sync(pd->dev); + return sh_mobile_i2c_check_timing(pd); } static unsigned char i2c_op(struct sh_mobile_i2c_data *pd, @@ -350,10 +332,7 @@ static unsigned char i2c_op(struct sh_mobile_i2c_data *pd, case OP_TX: /* write data */ iic_wr(pd, ICDR, data); break; - case OP_TX_STOP_DATA: /* write data and issue a stop afterwards */ - iic_wr(pd, ICDR, data); - /* fallthrough */ - case OP_TX_STOP: /* issue a stop */ + case OP_TX_STOP: /* issue a stop (or rep_start) */ iic_wr(pd, ICCR, pd->send_stop ? ICCR_ICE | ICCR_TRS : ICCR_ICE | ICCR_TRS | ICCR_BBSY); break; @@ -387,11 +366,6 @@ static bool sh_mobile_i2c_is_first_byte(struct sh_mobile_i2c_data *pd) return pd->pos == -1; } -static bool sh_mobile_i2c_is_last_byte(struct sh_mobile_i2c_data *pd) -{ - return pd->pos == pd->msg->len - 1; -} - static void sh_mobile_i2c_get_data(struct sh_mobile_i2c_data *pd, unsigned char *buf) { @@ -409,20 +383,12 @@ static int sh_mobile_i2c_isr_tx(struct sh_mobile_i2c_data *pd) unsigned char data; if (pd->pos == pd->msg->len) { - /* Send stop if we haven't yet (DMA case) */ - if (pd->send_stop && pd->stop_after_dma) - i2c_op(pd, OP_TX_STOP, 0); + i2c_op(pd, OP_TX_STOP, 0); return 1; } sh_mobile_i2c_get_data(pd, &data); - - if (sh_mobile_i2c_is_last_byte(pd)) - i2c_op(pd, OP_TX_STOP_DATA, data); - else if (sh_mobile_i2c_is_first_byte(pd)) - i2c_op(pd, OP_TX_FIRST, data); - else - i2c_op(pd, OP_TX, data); + i2c_op(pd, sh_mobile_i2c_is_first_byte(pd) ? OP_TX_FIRST : OP_TX, data); pd->pos++; return 0; @@ -464,8 +430,9 @@ static int sh_mobile_i2c_isr_rx(struct sh_mobile_i2c_data *pd) break; } data = i2c_op(pd, OP_RX_STOP_DATA, 0); - } else + } else if (real_pos >= 0) { data = i2c_op(pd, OP_RX, 0); + } if (real_pos >= 0) pd->msg->buf[real_pos] = data; @@ -548,6 +515,8 @@ static void sh_mobile_i2c_dma_callback(void *data) pd->pos = pd->msg->len; pd->stop_after_dma = true; + i2c_release_dma_safe_msg_buf(pd->msg, pd->dma_buf); + iic_set_clr(pd, ICIC, 0, ICIC_TDMAE | ICIC_RDMAE); } @@ -608,7 +577,7 @@ static void sh_mobile_i2c_xfer_dma(struct sh_mobile_i2c_data *pd) if (IS_ERR(chan)) return; - dma_addr = dma_map_single(chan->device->dev, pd->msg->buf, pd->msg->len, dir); + dma_addr = dma_map_single(chan->device->dev, pd->dma_buf, pd->msg->len, dir); if (dma_mapping_error(chan->device->dev, dma_addr)) { dev_dbg(pd->dev, "dma map failed, using PIO\n"); return; @@ -651,10 +620,10 @@ static int start_ch(struct sh_mobile_i2c_data *pd, struct i2c_msg *usr_msg, if (do_init) { /* Initialize channel registers */ - iic_set_clr(pd, ICCR, 0, ICCR_ICE); + iic_wr(pd, ICCR, ICCR_SCP); /* Enable channel and configure rx ack */ - iic_set_clr(pd, ICCR, ICCR_ICE, 0); + iic_wr(pd, ICCR, ICCR_ICE | ICCR_SCP); /* Set the clock */ iic_wr(pd, ICCL, pd->iccl & 0xff); @@ -665,7 +634,8 @@ static int start_ch(struct sh_mobile_i2c_data *pd, struct i2c_msg *usr_msg, pd->pos = -1; pd->sr = 0; - if (pd->msg->len > 8) + pd->dma_buf = i2c_get_dma_safe_msg_buf(pd->msg, 8); + if (pd->dma_buf) sh_mobile_i2c_xfer_dma(pd); /* Enable all interrupts to begin with */ @@ -731,7 +701,8 @@ static int sh_mobile_i2c_xfer(struct i2c_adapter *adapter, int i; long timeout; - activate_ch(pd); + /* Wake up device and enable clock */ + pm_runtime_get_sync(pd->dev); /* Process all messages */ for (i = 0; i < num; i++) { @@ -768,11 +739,13 @@ static int sh_mobile_i2c_xfer(struct i2c_adapter *adapter, break; } - deactivate_ch(pd); + /* Disable channel */ + iic_wr(pd, ICCR, ICCR_SCP); - if (!err) - err = num; - return err; + /* Disable clock and mark device as idle */ + pm_runtime_put_sync(pd->dev); + + return err ?: num; } static u32 sh_mobile_i2c_func(struct i2c_adapter *adapter) @@ -789,7 +762,7 @@ static const struct i2c_algorithm sh_mobile_i2c_algorithm = { * r8a7740 chip has lasting errata on I2C I/O pad reset. * this is work-around for it. */ -static void sh_mobile_i2c_r8a7740_workaround(struct sh_mobile_i2c_data *pd) +static int sh_mobile_i2c_r8a7740_workaround(struct sh_mobile_i2c_data *pd) { iic_set_clr(pd, ICCR, ICCR_ICE, 0); iic_rd(pd, ICCR); /* dummy read */ @@ -810,14 +783,23 @@ static void sh_mobile_i2c_r8a7740_workaround(struct sh_mobile_i2c_data *pd) udelay(10); iic_wr(pd, ICCR, ICCR_TRS); udelay(10); + + return sh_mobile_i2c_init(pd); } static const struct sh_mobile_dt_config default_dt_config = { .clks_per_count = 1, + .setup = sh_mobile_i2c_init, }; static const struct sh_mobile_dt_config fast_clock_dt_config = { .clks_per_count = 2, + .setup = sh_mobile_i2c_init, +}; + +static const struct sh_mobile_dt_config v2_freq_calc_dt_config = { + .clks_per_count = 2, + .setup = sh_mobile_i2c_v2_init, }; static const struct sh_mobile_dt_config r8a7740_dt_config = { @@ -828,7 +810,7 @@ static const struct sh_mobile_dt_config r8a7740_dt_config = { static const struct of_device_id sh_mobile_i2c_dt_ids[] = { { .compatible = "renesas,iic-r8a73a4", .data = &fast_clock_dt_config }, { .compatible = "renesas,iic-r8a7740", .data = &r8a7740_dt_config }, - { .compatible = "renesas,iic-r8a7790", .data = &fast_clock_dt_config }, + { .compatible = "renesas,iic-r8a7790", .data = &v2_freq_calc_dt_config }, { .compatible = "renesas,iic-r8a7791", .data = &fast_clock_dt_config }, { .compatible = "renesas,iic-r8a7792", .data = &fast_clock_dt_config }, { .compatible = "renesas,iic-r8a7793", .data = &fast_clock_dt_config }, @@ -910,32 +892,13 @@ static int sh_mobile_i2c_probe(struct platform_device *dev) return PTR_ERR(pd->reg); ret = of_property_read_u32(dev->dev.of_node, "clock-frequency", &bus_speed); - pd->bus_speed = ret ? STANDARD_MODE : bus_speed; + pd->bus_speed = (ret || !bus_speed) ? STANDARD_MODE : bus_speed; pd->clks_per_count = 1; - config = of_device_get_match_data(&dev->dev); - if (config) { - pd->clks_per_count = config->clks_per_count; - - if (config->setup) - config->setup(pd); - } - - /* The IIC blocks on SH-Mobile ARM processors - * come with two new bits in ICIC. - */ + /* Newer variants come with two new bits in ICIC */ if (resource_size(res) > 0x17) pd->flags |= IIC_FLAG_HAS_ICIC67; - ret = sh_mobile_i2c_init(pd); - if (ret) - return ret; - - /* Init DMA */ - sg_init_table(&pd->sg, 1); - pd->dma_direction = DMA_NONE; - pd->dma_rx = pd->dma_tx = ERR_PTR(-EPROBE_DEFER); - /* Enable Runtime PM for this device. * * Also tell the Runtime PM core to ignore children @@ -948,6 +911,24 @@ static int sh_mobile_i2c_probe(struct platform_device *dev) */ pm_suspend_ignore_children(&dev->dev, true); pm_runtime_enable(&dev->dev); + pm_runtime_get_sync(&dev->dev); + + config = of_device_get_match_data(&dev->dev); + if (config) { + pd->clks_per_count = config->clks_per_count; + ret = config->setup(pd); + } else { + ret = sh_mobile_i2c_init(pd); + } + + pm_runtime_put_sync(&dev->dev); + if (ret) + return ret; + + /* Init DMA */ + sg_init_table(&pd->sg, 1); + pd->dma_direction = DMA_NONE; + pd->dma_rx = pd->dma_tx = ERR_PTR(-EPROBE_DEFER); /* setup the private data */ adap = &pd->adap; diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index f7829a7..5a00bf4 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -27,7 +27,7 @@ #include <linux/delay.h> #include <linux/err.h> #include <linux/errno.h> -#include <linux/gpio.h> +#include <linux/gpio/consumer.h> #include <linux/i2c.h> #include <linux/i2c-smbus.h> #include <linux/idr.h> @@ -134,52 +134,22 @@ static int i2c_device_uevent(struct device *dev, struct kobj_uevent_env *env) /* i2c bus recovery routines */ static int get_scl_gpio_value(struct i2c_adapter *adap) { - return gpio_get_value(adap->bus_recovery_info->scl_gpio); + return gpiod_get_value_cansleep(adap->bus_recovery_info->scl_gpiod); } static void set_scl_gpio_value(struct i2c_adapter *adap, int val) { - gpio_set_value(adap->bus_recovery_info->scl_gpio, val); + gpiod_set_value_cansleep(adap->bus_recovery_info->scl_gpiod, val); } static int get_sda_gpio_value(struct i2c_adapter *adap) { - return gpio_get_value(adap->bus_recovery_info->sda_gpio); + return gpiod_get_value_cansleep(adap->bus_recovery_info->sda_gpiod); } -static int i2c_get_gpios_for_recovery(struct i2c_adapter *adap) +static void set_sda_gpio_value(struct i2c_adapter *adap, int val) { - struct i2c_bus_recovery_info *bri = adap->bus_recovery_info; - struct device *dev = &adap->dev; - int ret = 0; - - ret = gpio_request_one(bri->scl_gpio, GPIOF_OPEN_DRAIN | - GPIOF_OUT_INIT_HIGH, "i2c-scl"); - if (ret) { - dev_warn(dev, "Can't get SCL gpio: %d\n", bri->scl_gpio); - return ret; - } - - if (bri->get_sda) { - if (gpio_request_one(bri->sda_gpio, GPIOF_IN, "i2c-sda")) { - /* work without SDA polling */ - dev_warn(dev, "Can't get SDA gpio: %d. Not using SDA polling\n", - bri->sda_gpio); - bri->get_sda = NULL; - } - } - - return ret; -} - -static void i2c_put_gpios_for_recovery(struct i2c_adapter *adap) -{ - struct i2c_bus_recovery_info *bri = adap->bus_recovery_info; - - if (bri->get_sda) - gpio_free(bri->sda_gpio); - - gpio_free(bri->scl_gpio); + gpiod_set_value_cansleep(adap->bus_recovery_info->sda_gpiod, val); } /* @@ -190,7 +160,7 @@ static void i2c_put_gpios_for_recovery(struct i2c_adapter *adap) #define RECOVERY_NDELAY 5000 #define RECOVERY_CLK_CNT 9 -static int i2c_generic_recovery(struct i2c_adapter *adap) +int i2c_generic_scl_recovery(struct i2c_adapter *adap) { struct i2c_bus_recovery_info *bri = adap->bus_recovery_info; int i = 0, val = 1, ret = 0; @@ -199,6 +169,8 @@ static int i2c_generic_recovery(struct i2c_adapter *adap) bri->prepare_recovery(adap); bri->set_scl(adap, val); + if (bri->set_sda) + bri->set_sda(adap, 1); ndelay(RECOVERY_NDELAY); /* @@ -227,33 +199,25 @@ static int i2c_generic_recovery(struct i2c_adapter *adap) if (bri->get_sda && !bri->get_sda(adap)) ret = -EBUSY; + /* If all went well, send STOP for a sane bus state. */ + if (ret == 0 && bri->set_sda) { + bri->set_scl(adap, 0); + ndelay(RECOVERY_NDELAY / 2); + bri->set_sda(adap, 0); + ndelay(RECOVERY_NDELAY / 2); + bri->set_scl(adap, 1); + ndelay(RECOVERY_NDELAY / 2); + bri->set_sda(adap, 1); + ndelay(RECOVERY_NDELAY / 2); + } + if (bri->unprepare_recovery) bri->unprepare_recovery(adap); return ret; } - -int i2c_generic_scl_recovery(struct i2c_adapter *adap) -{ - return i2c_generic_recovery(adap); -} EXPORT_SYMBOL_GPL(i2c_generic_scl_recovery); -int i2c_generic_gpio_recovery(struct i2c_adapter *adap) -{ - int ret; - - ret = i2c_get_gpios_for_recovery(adap); - if (ret) - return ret; - - ret = i2c_generic_recovery(adap); - i2c_put_gpios_for_recovery(adap); - - return ret; -} -EXPORT_SYMBOL_GPL(i2c_generic_gpio_recovery); - int i2c_recover_bus(struct i2c_adapter *adap) { if (!adap->bus_recovery_info) @@ -277,21 +241,19 @@ static void i2c_init_recovery(struct i2c_adapter *adap) goto err; } - /* Generic GPIO recovery */ - if (bri->recover_bus == i2c_generic_gpio_recovery) { - if (!gpio_is_valid(bri->scl_gpio)) { - err_str = "invalid SCL gpio"; - goto err; - } - - if (gpio_is_valid(bri->sda_gpio)) - bri->get_sda = get_sda_gpio_value; - else - bri->get_sda = NULL; - + if (bri->scl_gpiod && bri->recover_bus == i2c_generic_scl_recovery) { bri->get_scl = get_scl_gpio_value; bri->set_scl = set_scl_gpio_value; - } else if (bri->recover_bus == i2c_generic_scl_recovery) { + if (bri->sda_gpiod) { + bri->get_sda = get_sda_gpio_value; + /* FIXME: add proper flag instead of '0' once available */ + if (gpiod_get_direction(bri->sda_gpiod) == 0) + bri->set_sda = set_sda_gpio_value; + } + return; + } + + if (bri->recover_bus == i2c_generic_scl_recovery) { /* Generic SCL recovery */ if (!bri->set_scl || !bri->get_scl) { err_str = "no {get|set}_scl() found"; @@ -1976,63 +1938,35 @@ int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) EXPORT_SYMBOL(i2c_transfer); /** - * i2c_master_send - issue a single I2C message in master transmit mode - * @client: Handle to slave device - * @buf: Data that will be written to the slave - * @count: How many bytes to write, must be less than 64k since msg.len is u16 - * - * Returns negative errno, or else the number of bytes written. - */ -int i2c_master_send(const struct i2c_client *client, const char *buf, int count) -{ - int ret; - struct i2c_adapter *adap = client->adapter; - struct i2c_msg msg; - - msg.addr = client->addr; - msg.flags = client->flags & I2C_M_TEN; - msg.len = count; - msg.buf = (char *)buf; - - ret = i2c_transfer(adap, &msg, 1); - - /* - * If everything went ok (i.e. 1 msg transmitted), return #bytes - * transmitted, else error code. - */ - return (ret == 1) ? count : ret; -} -EXPORT_SYMBOL(i2c_master_send); - -/** - * i2c_master_recv - issue a single I2C message in master receive mode + * i2c_transfer_buffer_flags - issue a single I2C message transferring data + * to/from a buffer * @client: Handle to slave device - * @buf: Where to store data read from slave - * @count: How many bytes to read, must be less than 64k since msg.len is u16 + * @buf: Where the data is stored + * @count: How many bytes to transfer, must be less than 64k since msg.len is u16 + * @flags: The flags to be used for the message, e.g. I2C_M_RD for reads * - * Returns negative errno, or else the number of bytes read. + * Returns negative errno, or else the number of bytes transferred. */ -int i2c_master_recv(const struct i2c_client *client, char *buf, int count) +int i2c_transfer_buffer_flags(const struct i2c_client *client, char *buf, + int count, u16 flags) { - struct i2c_adapter *adap = client->adapter; - struct i2c_msg msg; int ret; + struct i2c_msg msg = { + .addr = client->addr, + .flags = flags | (client->flags & I2C_M_TEN), + .len = count, + .buf = buf, + }; - msg.addr = client->addr; - msg.flags = client->flags & I2C_M_TEN; - msg.flags |= I2C_M_RD; - msg.len = count; - msg.buf = buf; - - ret = i2c_transfer(adap, &msg, 1); + ret = i2c_transfer(client->adapter, &msg, 1); /* - * If everything went ok (i.e. 1 msg received), return #bytes received, - * else error code. + * If everything went ok (i.e. 1 msg transferred), return #bytes + * transferred, else error code. */ return (ret == 1) ? count : ret; } -EXPORT_SYMBOL(i2c_master_recv); +EXPORT_SYMBOL(i2c_transfer_buffer_flags); /* ---------------------------------------------------- * the i2c address scanning function @@ -2265,6 +2199,52 @@ void i2c_put_adapter(struct i2c_adapter *adap) } EXPORT_SYMBOL(i2c_put_adapter); +/** + * i2c_get_dma_safe_msg_buf() - get a DMA safe buffer for the given i2c_msg + * @msg: the message to be checked + * @threshold: the minimum number of bytes for which using DMA makes sense + * + * Return: NULL if a DMA safe buffer was not obtained. Use msg->buf with PIO. + * Or a valid pointer to be used with DMA. After use, release it by + * calling i2c_release_dma_safe_msg_buf(). + * + * This function must only be called from process context! + */ +u8 *i2c_get_dma_safe_msg_buf(struct i2c_msg *msg, unsigned int threshold) +{ + if (msg->len < threshold) + return NULL; + + if (msg->flags & I2C_M_DMA_SAFE) + return msg->buf; + + pr_debug("using bounce buffer for addr=0x%02x, len=%d\n", + msg->addr, msg->len); + + if (msg->flags & I2C_M_RD) + return kzalloc(msg->len, GFP_KERNEL); + else + return kmemdup(msg->buf, msg->len, GFP_KERNEL); +} +EXPORT_SYMBOL_GPL(i2c_get_dma_safe_msg_buf); + +/** + * i2c_release_dma_safe_msg_buf - release DMA safe buffer and sync with i2c_msg + * @msg: the message to be synced with + * @buf: the buffer obtained from i2c_get_dma_safe_msg_buf(). May be NULL. + */ +void i2c_release_dma_safe_msg_buf(struct i2c_msg *msg, u8 *buf) +{ + if (!buf || buf == msg->buf) + return; + + if (msg->flags & I2C_M_RD) + memcpy(msg->buf, buf, msg->len); + + kfree(buf); +} +EXPORT_SYMBOL_GPL(i2c_release_dma_safe_msg_buf); + MODULE_AUTHOR("Simon G. Vogl <simon@tk.uni-linz.ac.at>"); MODULE_DESCRIPTION("I2C-Bus main module"); MODULE_LICENSE("GPL"); diff --git a/drivers/i2c/i2c-core-smbus.c b/drivers/i2c/i2c-core-smbus.c index a1082c0..59d5cf3 100644 --- a/drivers/i2c/i2c-core-smbus.c +++ b/drivers/i2c/i2c-core-smbus.c @@ -18,6 +18,7 @@ #include <linux/err.h> #include <linux/i2c.h> #include <linux/i2c-smbus.h> +#include <linux/slab.h> #define CREATE_TRACE_POINTS #include <trace/events/smbus.h> @@ -291,6 +292,22 @@ s32 i2c_smbus_write_i2c_block_data(const struct i2c_client *client, u8 command, } EXPORT_SYMBOL(i2c_smbus_write_i2c_block_data); +static void i2c_smbus_try_get_dmabuf(struct i2c_msg *msg, u8 init_val) +{ + bool is_read = msg->flags & I2C_M_RD; + unsigned char *dma_buf; + + dma_buf = kzalloc(I2C_SMBUS_BLOCK_MAX + (is_read ? 2 : 3), GFP_KERNEL); + if (!dma_buf) + return; + + msg->buf = dma_buf; + msg->flags |= I2C_M_DMA_SAFE; + + if (init_val) + msg->buf[0] = init_val; +} + /* Simulate a SMBus command using the i2c protocol No checking of parameters is done! */ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter *adapter, u16 addr, @@ -368,6 +385,7 @@ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter *adapter, u16 addr, msg[1].flags |= I2C_M_RECV_LEN; msg[1].len = 1; /* block length will be added by the underlying bus driver */ + i2c_smbus_try_get_dmabuf(&msg[1], 0); } else { msg[0].len = data->block[0] + 2; if (msg[0].len > I2C_SMBUS_BLOCK_MAX + 2) { @@ -376,8 +394,10 @@ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter *adapter, u16 addr, data->block[0]); return -EINVAL; } + + i2c_smbus_try_get_dmabuf(&msg[0], command); for (i = 1; i < msg[0].len; i++) - msgbuf0[i] = data->block[i-1]; + msg[0].buf[i] = data->block[i - 1]; } break; case I2C_SMBUS_BLOCK_PROC_CALL: @@ -389,12 +409,16 @@ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter *adapter, u16 addr, data->block[0]); return -EINVAL; } + msg[0].len = data->block[0] + 2; + i2c_smbus_try_get_dmabuf(&msg[0], command); for (i = 1; i < msg[0].len; i++) - msgbuf0[i] = data->block[i-1]; + msg[0].buf[i] = data->block[i - 1]; + msg[1].flags |= I2C_M_RECV_LEN; msg[1].len = 1; /* block length will be added by the underlying bus driver */ + i2c_smbus_try_get_dmabuf(&msg[1], 0); break; case I2C_SMBUS_I2C_BLOCK_DATA: if (data->block[0] > I2C_SMBUS_BLOCK_MAX) { @@ -406,10 +430,13 @@ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter *adapter, u16 addr, if (read_write == I2C_SMBUS_READ) { msg[1].len = data->block[0]; + i2c_smbus_try_get_dmabuf(&msg[1], 0); } else { msg[0].len = data->block[0] + 1; + + i2c_smbus_try_get_dmabuf(&msg[0], command); for (i = 1; i <= data->block[0]; i++) - msgbuf0[i] = data->block[i]; + msg[0].buf[i] = data->block[i]; } break; default: @@ -457,14 +484,20 @@ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter *adapter, u16 addr, break; case I2C_SMBUS_I2C_BLOCK_DATA: for (i = 0; i < data->block[0]; i++) - data->block[i+1] = msgbuf1[i]; + data->block[i + 1] = msg[1].buf[i]; break; case I2C_SMBUS_BLOCK_DATA: case I2C_SMBUS_BLOCK_PROC_CALL: - for (i = 0; i < msgbuf1[0] + 1; i++) - data->block[i] = msgbuf1[i]; + for (i = 0; i < msg[1].buf[0] + 1; i++) + data->block[i] = msg[1].buf[i]; break; } + + if (msg[0].flags & I2C_M_DMA_SAFE) + kfree(msg[0].buf); + if (msg[1].flags & I2C_M_DMA_SAFE) + kfree(msg[1].buf); + return 0; } diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c index 2cab27a..036a03f 100644 --- a/drivers/i2c/i2c-dev.c +++ b/drivers/i2c/i2c-dev.c @@ -264,6 +264,8 @@ static noinline int i2cdev_ioctl_rdwr(struct i2c_client *client, res = PTR_ERR(msgs[i].buf); break; } + /* memdup_user allocates with GFP_KERNEL, so DMA is ok */ + msgs[i].flags |= I2C_M_DMA_SAFE; /* * If the message length is received from the slave (similar diff --git a/drivers/i2c/muxes/Kconfig b/drivers/i2c/muxes/Kconfig index 0f5c8fc..52a4a92 100644 --- a/drivers/i2c/muxes/Kconfig +++ b/drivers/i2c/muxes/Kconfig @@ -64,11 +64,11 @@ config I2C_MUX_PCA9541 will be called i2c-mux-pca9541. config I2C_MUX_PCA954x - tristate "Philips PCA954x I2C Mux/switches" + tristate "NXP PCA954x and PCA984x I2C Mux/switches" depends on GPIOLIB || COMPILE_TEST help - If you say yes here you get support for the Philips PCA954x - I2C mux/switch devices. + If you say yes here you get support for the NXP PCA954x + and PCA984x I2C mux/switch devices. This driver can also be built as a module. If so, the module will be called i2c-mux-pca954x. diff --git a/drivers/i2c/muxes/i2c-mux-pca954x.c b/drivers/i2c/muxes/i2c-mux-pca954x.c index 2ca068d..fbb84c7 100644 --- a/drivers/i2c/muxes/i2c-mux-pca954x.c +++ b/drivers/i2c/muxes/i2c-mux-pca954x.c @@ -4,11 +4,11 @@ * Copyright (c) 2008-2009 Rodolfo Giometti <giometti@linux.it> * Copyright (c) 2008-2009 Eurotech S.p.A. <info@eurotech.it> * - * This module supports the PCA954x series of I2C multiplexer/switch chips - * made by Philips Semiconductors. + * This module supports the PCA954x and PCA954x series of I2C multiplexer/switch + * chips made by NXP Semiconductors. * This includes the: - * PCA9540, PCA9542, PCA9543, PCA9544, PCA9545, PCA9546, PCA9547 - * and PCA9548. + * PCA9540, PCA9542, PCA9543, PCA9544, PCA9545, PCA9546, PCA9547, + * PCA9548, PCA9846, PCA9847, PCA9848 and PCA9849. * * These chips are all controlled via the I2C bus itself, and all have a * single 8-bit register. The upstream "parent" bus fans out to two, @@ -63,6 +63,10 @@ enum pca_type { pca_9546, pca_9547, pca_9548, + pca_9846, + pca_9847, + pca_9848, + pca_9849, }; struct chip_desc { @@ -129,6 +133,24 @@ static const struct chip_desc chips[] = { .nchans = 8, .muxtype = pca954x_isswi, }, + [pca_9846] = { + .nchans = 4, + .muxtype = pca954x_isswi, + }, + [pca_9847] = { + .nchans = 8, + .enable = 0x8, + .muxtype = pca954x_ismux, + }, + [pca_9848] = { + .nchans = 8, + .muxtype = pca954x_isswi, + }, + [pca_9849] = { + .nchans = 4, + .enable = 0x4, + .muxtype = pca954x_ismux, + }, }; static const struct i2c_device_id pca954x_id[] = { @@ -140,6 +162,10 @@ static const struct i2c_device_id pca954x_id[] = { { "pca9546", pca_9546 }, { "pca9547", pca_9547 }, { "pca9548", pca_9548 }, + { "pca9846", pca_9846 }, + { "pca9847", pca_9847 }, + { "pca9848", pca_9848 }, + { "pca9849", pca_9849 }, { } }; MODULE_DEVICE_TABLE(i2c, pca954x_id); @@ -154,6 +180,10 @@ static const struct of_device_id pca954x_of_match[] = { { .compatible = "nxp,pca9546", .data = &chips[pca_9546] }, { .compatible = "nxp,pca9547", .data = &chips[pca_9547] }, { .compatible = "nxp,pca9548", .data = &chips[pca_9548] }, + { .compatible = "nxp,pca9846", .data = &chips[pca_9846] }, + { .compatible = "nxp,pca9847", .data = &chips[pca_9847] }, + { .compatible = "nxp,pca9848", .data = &chips[pca_9848] }, + { .compatible = "nxp,pca9849", .data = &chips[pca_9849] }, {} }; MODULE_DEVICE_TABLE(of, pca954x_of_match); diff --git a/drivers/i2c/muxes/i2c-mux-reg.c b/drivers/i2c/muxes/i2c-mux-reg.c index f6c9c3d..c948e5a 100644 --- a/drivers/i2c/muxes/i2c-mux-reg.c +++ b/drivers/i2c/muxes/i2c-mux-reg.c @@ -177,6 +177,9 @@ static int i2c_mux_reg_probe(struct platform_device *pdev) sizeof(mux->data)); } else { ret = i2c_mux_reg_probe_dt(mux, pdev); + if (ret == -EPROBE_DEFER) + return ret; + if (ret < 0) { dev_err(&pdev->dev, "Error parsing device tree"); return ret; diff --git a/drivers/misc/eeprom/Kconfig b/drivers/misc/eeprom/Kconfig index de58762..68a1ac9 100644 --- a/drivers/misc/eeprom/Kconfig +++ b/drivers/misc/eeprom/Kconfig @@ -4,6 +4,7 @@ config EEPROM_AT24 tristate "I2C EEPROMs / RAMs / ROMs from most vendors" depends on I2C && SYSFS select NVMEM + select REGMAP_I2C help Enable this driver to get read/write support to most I2C EEPROMs and compatible devices like FRAMs, SRAMs, ROMs etc. After you diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c index 4d63ac8..01f9c49 100644 --- a/drivers/misc/eeprom/at24.c +++ b/drivers/misc/eeprom/at24.c @@ -24,8 +24,10 @@ #include <linux/acpi.h> #include <linux/i2c.h> #include <linux/nvmem-provider.h> +#include <linux/regmap.h> #include <linux/platform_data/at24.h> #include <linux/pm_runtime.h> +#include <linux/gpio/consumer.h> /* * I2C EEPROMs from most vendors are inexpensive and mostly interchangeable. @@ -55,14 +57,13 @@ * which won't work on pure SMBus systems. */ +struct at24_client { + struct i2c_client *client; + struct regmap *regmap; +}; + struct at24_data { struct at24_platform_data chip; - int use_smbus; - int use_smbus_write; - - ssize_t (*read_func)(struct at24_data *, char *, unsigned int, size_t); - ssize_t (*write_func)(struct at24_data *, - const char *, unsigned int, size_t); /* * Lock protects against activities from other Linux tasks, @@ -70,18 +71,20 @@ struct at24_data { */ struct mutex lock; - u8 *writebuf; - unsigned write_max; - unsigned num_addresses; + unsigned int write_max; + unsigned int num_addresses; + unsigned int offset_adj; struct nvmem_config nvmem_config; struct nvmem_device *nvmem; + struct gpio_desc *wp_gpio; + /* * Some chips tie up multiple I2C addresses; dummy devices reserve * them for us, and we'll use them with SMBus calls. */ - struct i2c_client *client[]; + struct at24_client client[]; }; /* @@ -93,27 +96,17 @@ struct at24_data { * * This value is forced to be a power of two so that writes align on pages. */ -static unsigned io_limit = 128; -module_param(io_limit, uint, 0); -MODULE_PARM_DESC(io_limit, "Maximum bytes per I/O (default 128)"); +static unsigned int at24_io_limit = 128; +module_param_named(io_limit, at24_io_limit, uint, 0); +MODULE_PARM_DESC(at24_io_limit, "Maximum bytes per I/O (default 128)"); /* * Specs often allow 5 msec for a page write, sometimes 20 msec; * it's important to recover from write timeouts. */ -static unsigned write_timeout = 25; -module_param(write_timeout, uint, 0); -MODULE_PARM_DESC(write_timeout, "Time (in ms) to try writes (default 25)"); - -#define AT24_SIZE_BYTELEN 5 -#define AT24_SIZE_FLAGS 8 - -#define AT24_BITMASK(x) (BIT(x) - 1) - -/* create non-zero magic value for given eeprom parameters */ -#define AT24_DEVICE_MAGIC(_len, _flags) \ - ((1 << AT24_SIZE_FLAGS | (_flags)) \ - << AT24_SIZE_BYTELEN | ilog2(_len)) +static unsigned int at24_write_timeout = 25; +module_param_named(write_timeout, at24_write_timeout, uint, 0); +MODULE_PARM_DESC(at24_write_timeout, "Time (in ms) to try writes (default 25)"); /* * Both reads and writes fail if the previous write didn't complete yet. This @@ -126,118 +119,123 @@ MODULE_PARM_DESC(write_timeout, "Time (in ms) to try writes (default 25)"); * iteration of processing the request. Both should be unsigned integers * holding at least 32 bits. */ -#define loop_until_timeout(tout, op_time) \ - for (tout = jiffies + msecs_to_jiffies(write_timeout), op_time = 0; \ +#define at24_loop_until_timeout(tout, op_time) \ + for (tout = jiffies + msecs_to_jiffies(at24_write_timeout), \ + op_time = 0; \ op_time ? time_before(op_time, tout) : true; \ usleep_range(1000, 1500), op_time = jiffies) +struct at24_chip_data { + /* + * these fields mirror their equivalents in + * struct at24_platform_data + */ + u32 byte_len; + u8 flags; +}; + +#define AT24_CHIP_DATA(_name, _len, _flags) \ + static const struct at24_chip_data _name = { \ + .byte_len = _len, .flags = _flags, \ + } + +/* needs 8 addresses as A0-A2 are ignored */ +AT24_CHIP_DATA(at24_data_24c00, 128 / 8, AT24_FLAG_TAKE8ADDR); +/* old variants can't be handled with this generic entry! */ +AT24_CHIP_DATA(at24_data_24c01, 1024 / 8, 0); +AT24_CHIP_DATA(at24_data_24cs01, 16, + AT24_FLAG_SERIAL | AT24_FLAG_READONLY); +AT24_CHIP_DATA(at24_data_24c02, 2048 / 8, 0); +AT24_CHIP_DATA(at24_data_24cs02, 16, + AT24_FLAG_SERIAL | AT24_FLAG_READONLY); +AT24_CHIP_DATA(at24_data_24mac402, 48 / 8, + AT24_FLAG_MAC | AT24_FLAG_READONLY); +AT24_CHIP_DATA(at24_data_24mac602, 64 / 8, + AT24_FLAG_MAC | AT24_FLAG_READONLY); +/* spd is a 24c02 in memory DIMMs */ +AT24_CHIP_DATA(at24_data_spd, 2048 / 8, + AT24_FLAG_READONLY | AT24_FLAG_IRUGO); +AT24_CHIP_DATA(at24_data_24c04, 4096 / 8, 0); +AT24_CHIP_DATA(at24_data_24cs04, 16, + AT24_FLAG_SERIAL | AT24_FLAG_READONLY); +/* 24rf08 quirk is handled at i2c-core */ +AT24_CHIP_DATA(at24_data_24c08, 8192 / 8, 0); +AT24_CHIP_DATA(at24_data_24cs08, 16, + AT24_FLAG_SERIAL | AT24_FLAG_READONLY); +AT24_CHIP_DATA(at24_data_24c16, 16384 / 8, 0); +AT24_CHIP_DATA(at24_data_24cs16, 16, + AT24_FLAG_SERIAL | AT24_FLAG_READONLY); +AT24_CHIP_DATA(at24_data_24c32, 32768 / 8, AT24_FLAG_ADDR16); +AT24_CHIP_DATA(at24_data_24cs32, 16, + AT24_FLAG_ADDR16 | AT24_FLAG_SERIAL | AT24_FLAG_READONLY); +AT24_CHIP_DATA(at24_data_24c64, 65536 / 8, AT24_FLAG_ADDR16); +AT24_CHIP_DATA(at24_data_24cs64, 16, + AT24_FLAG_ADDR16 | AT24_FLAG_SERIAL | AT24_FLAG_READONLY); +AT24_CHIP_DATA(at24_data_24c128, 131072 / 8, AT24_FLAG_ADDR16); +AT24_CHIP_DATA(at24_data_24c256, 262144 / 8, AT24_FLAG_ADDR16); +AT24_CHIP_DATA(at24_data_24c512, 524288 / 8, AT24_FLAG_ADDR16); +AT24_CHIP_DATA(at24_data_24c1024, 1048576 / 8, AT24_FLAG_ADDR16); +/* identical to 24c08 ? */ +AT24_CHIP_DATA(at24_data_INT3499, 8192 / 8, 0); + static const struct i2c_device_id at24_ids[] = { - /* needs 8 addresses as A0-A2 are ignored */ - { "24c00", AT24_DEVICE_MAGIC(128 / 8, AT24_FLAG_TAKE8ADDR) }, - /* old variants can't be handled with this generic entry! */ - { "24c01", AT24_DEVICE_MAGIC(1024 / 8, 0) }, - { "24cs01", AT24_DEVICE_MAGIC(16, - AT24_FLAG_SERIAL | AT24_FLAG_READONLY) }, - { "24c02", AT24_DEVICE_MAGIC(2048 / 8, 0) }, - { "24cs02", AT24_DEVICE_MAGIC(16, - AT24_FLAG_SERIAL | AT24_FLAG_READONLY) }, - { "24mac402", AT24_DEVICE_MAGIC(48 / 8, - AT24_FLAG_MAC | AT24_FLAG_READONLY) }, - { "24mac602", AT24_DEVICE_MAGIC(64 / 8, - AT24_FLAG_MAC | AT24_FLAG_READONLY) }, - /* spd is a 24c02 in memory DIMMs */ - { "spd", AT24_DEVICE_MAGIC(2048 / 8, - AT24_FLAG_READONLY | AT24_FLAG_IRUGO) }, - { "24c04", AT24_DEVICE_MAGIC(4096 / 8, 0) }, - { "24cs04", AT24_DEVICE_MAGIC(16, - AT24_FLAG_SERIAL | AT24_FLAG_READONLY) }, - /* 24rf08 quirk is handled at i2c-core */ - { "24c08", AT24_DEVICE_MAGIC(8192 / 8, 0) }, - { "24cs08", AT24_DEVICE_MAGIC(16, - AT24_FLAG_SERIAL | AT24_FLAG_READONLY) }, - { "24c16", AT24_DEVICE_MAGIC(16384 / 8, 0) }, - { "24cs16", AT24_DEVICE_MAGIC(16, - AT24_FLAG_SERIAL | AT24_FLAG_READONLY) }, - { "24c32", AT24_DEVICE_MAGIC(32768 / 8, AT24_FLAG_ADDR16) }, - { "24cs32", AT24_DEVICE_MAGIC(16, - AT24_FLAG_ADDR16 | - AT24_FLAG_SERIAL | - AT24_FLAG_READONLY) }, - { "24c64", AT24_DEVICE_MAGIC(65536 / 8, AT24_FLAG_ADDR16) }, - { "24cs64", AT24_DEVICE_MAGIC(16, - AT24_FLAG_ADDR16 | - AT24_FLAG_SERIAL | - AT24_FLAG_READONLY) }, - { "24c128", AT24_DEVICE_MAGIC(131072 / 8, AT24_FLAG_ADDR16) }, - { "24c256", AT24_DEVICE_MAGIC(262144 / 8, AT24_FLAG_ADDR16) }, - { "24c512", AT24_DEVICE_MAGIC(524288 / 8, AT24_FLAG_ADDR16) }, - { "24c1024", AT24_DEVICE_MAGIC(1048576 / 8, AT24_FLAG_ADDR16) }, - { "at24", 0 }, + { "24c00", (kernel_ulong_t)&at24_data_24c00 }, + { "24c01", (kernel_ulong_t)&at24_data_24c01 }, + { "24cs01", (kernel_ulong_t)&at24_data_24cs01 }, + { "24c02", (kernel_ulong_t)&at24_data_24c02 }, + { "24cs02", (kernel_ulong_t)&at24_data_24cs02 }, + { "24mac402", (kernel_ulong_t)&at24_data_24mac402 }, + { "24mac602", (kernel_ulong_t)&at24_data_24mac602 }, + { "spd", (kernel_ulong_t)&at24_data_spd }, + { "24c04", (kernel_ulong_t)&at24_data_24c04 }, + { "24cs04", (kernel_ulong_t)&at24_data_24cs04 }, + { "24c08", (kernel_ulong_t)&at24_data_24c08 }, + { "24cs08", (kernel_ulong_t)&at24_data_24cs08 }, + { "24c16", (kernel_ulong_t)&at24_data_24c16 }, + { "24cs16", (kernel_ulong_t)&at24_data_24cs16 }, + { "24c32", (kernel_ulong_t)&at24_data_24c32 }, + { "24cs32", (kernel_ulong_t)&at24_data_24cs32 }, + { "24c64", (kernel_ulong_t)&at24_data_24c64 }, + { "24cs64", (kernel_ulong_t)&at24_data_24cs64 }, + { "24c128", (kernel_ulong_t)&at24_data_24c128 }, + { "24c256", (kernel_ulong_t)&at24_data_24c256 }, + { "24c512", (kernel_ulong_t)&at24_data_24c512 }, + { "24c1024", (kernel_ulong_t)&at24_data_24c1024 }, + { "at24", 0 }, { /* END OF LIST */ } }; MODULE_DEVICE_TABLE(i2c, at24_ids); static const struct of_device_id at24_of_match[] = { - { - .compatible = "atmel,24c00", - .data = (void *)AT24_DEVICE_MAGIC(128 / 8, AT24_FLAG_TAKE8ADDR) - }, - { - .compatible = "atmel,24c01", - .data = (void *)AT24_DEVICE_MAGIC(1024 / 8, 0) - }, - { - .compatible = "atmel,24c02", - .data = (void *)AT24_DEVICE_MAGIC(2048 / 8, 0) - }, - { - .compatible = "atmel,spd", - .data = (void *)AT24_DEVICE_MAGIC(2048 / 8, - AT24_FLAG_READONLY | AT24_FLAG_IRUGO) - }, - { - .compatible = "atmel,24c04", - .data = (void *)AT24_DEVICE_MAGIC(4096 / 8, 0) - }, - { - .compatible = "atmel,24c08", - .data = (void *)AT24_DEVICE_MAGIC(8192 / 8, 0) - }, - { - .compatible = "atmel,24c16", - .data = (void *)AT24_DEVICE_MAGIC(16384 / 8, 0) - }, - { - .compatible = "atmel,24c32", - .data = (void *)AT24_DEVICE_MAGIC(32768 / 8, AT24_FLAG_ADDR16) - }, - { - .compatible = "atmel,24c64", - .data = (void *)AT24_DEVICE_MAGIC(65536 / 8, AT24_FLAG_ADDR16) - }, - { - .compatible = "atmel,24c128", - .data = (void *)AT24_DEVICE_MAGIC(131072 / 8, AT24_FLAG_ADDR16) - }, - { - .compatible = "atmel,24c256", - .data = (void *)AT24_DEVICE_MAGIC(262144 / 8, AT24_FLAG_ADDR16) - }, - { - .compatible = "atmel,24c512", - .data = (void *)AT24_DEVICE_MAGIC(524288 / 8, AT24_FLAG_ADDR16) - }, - { - .compatible = "atmel,24c1024", - .data = (void *)AT24_DEVICE_MAGIC(1048576 / 8, AT24_FLAG_ADDR16) - }, - { }, + { .compatible = "atmel,24c00", .data = &at24_data_24c00 }, + { .compatible = "atmel,24c01", .data = &at24_data_24c01 }, + { .compatible = "atmel,24cs01", .data = &at24_data_24cs01 }, + { .compatible = "atmel,24c02", .data = &at24_data_24c02 }, + { .compatible = "atmel,24cs02", .data = &at24_data_24cs02 }, + { .compatible = "atmel,24mac402", .data = &at24_data_24mac402 }, + { .compatible = "atmel,24mac602", .data = &at24_data_24mac602 }, + { .compatible = "atmel,spd", .data = &at24_data_spd }, + { .compatible = "atmel,24c04", .data = &at24_data_24c04 }, + { .compatible = "atmel,24cs04", .data = &at24_data_24cs04 }, + { .compatible = "atmel,24c08", .data = &at24_data_24c08 }, + { .compatible = "atmel,24cs08", .data = &at24_data_24cs08 }, + { .compatible = "atmel,24c16", .data = &at24_data_24c16 }, + { .compatible = "atmel,24cs16", .data = &at24_data_24cs16 }, + { .compatible = "atmel,24c32", .data = &at24_data_24c32 }, + { .compatible = "atmel,24cs32", .data = &at24_data_24cs32 }, + { .compatible = "atmel,24c64", .data = &at24_data_24c64 }, + { .compatible = "atmel,24cs64", .data = &at24_data_24cs64 }, + { .compatible = "atmel,24c128", .data = &at24_data_24c128 }, + { .compatible = "atmel,24c256", .data = &at24_data_24c256 }, + { .compatible = "atmel,24c512", .data = &at24_data_24c512 }, + { .compatible = "atmel,24c1024", .data = &at24_data_24c1024 }, + { /* END OF LIST */ }, }; MODULE_DEVICE_TABLE(of, at24_of_match); static const struct acpi_device_id at24_acpi_ids[] = { - { "INT3499", AT24_DEVICE_MAGIC(8192 / 8, 0) }, - { } + { "INT3499", (kernel_ulong_t)&at24_data_INT3499 }, + { /* END OF LIST */ } }; MODULE_DEVICE_TABLE(acpi, at24_acpi_ids); @@ -251,20 +249,11 @@ MODULE_DEVICE_TABLE(acpi, at24_acpi_ids); * Slave address and byte offset derive from the offset. Always * set the byte address; on a multi-master board, another master * may have changed the chip's "current" address pointer. - * - * REVISIT some multi-address chips don't rollover page reads to - * the next slave address, so we may need to truncate the count. - * Those chips might need another quirk flag. - * - * If the real hardware used four adjacent 24c02 chips and that - * were misconfigured as one 24c08, that would be a similar effect: - * one "eeprom" file not four, but larger reads would fail when - * they crossed certain pages. */ -static struct i2c_client *at24_translate_offset(struct at24_data *at24, - unsigned int *offset) +static struct at24_client *at24_translate_offset(struct at24_data *at24, + unsigned int *offset) { - unsigned i; + unsigned int i; if (at24->chip.flags & AT24_FLAG_ADDR16) { i = *offset >> 16; @@ -274,168 +263,55 @@ static struct i2c_client *at24_translate_offset(struct at24_data *at24, *offset &= 0xff; } - return at24->client[i]; + return &at24->client[i]; } -static ssize_t at24_eeprom_read_smbus(struct at24_data *at24, char *buf, +static size_t at24_adjust_read_count(struct at24_data *at24, unsigned int offset, size_t count) { - unsigned long timeout, read_time; - struct i2c_client *client; - int status; - - client = at24_translate_offset(at24, &offset); - - if (count > io_limit) - count = io_limit; - - /* Smaller eeproms can work given some SMBus extension calls */ - if (count > I2C_SMBUS_BLOCK_MAX) - count = I2C_SMBUS_BLOCK_MAX; - - loop_until_timeout(timeout, read_time) { - status = i2c_smbus_read_i2c_block_data_or_emulated(client, - offset, - count, buf); - - dev_dbg(&client->dev, "read %zu@%d --> %d (%ld)\n", - count, offset, status, jiffies); - - if (status == count) - return count; - } - - return -ETIMEDOUT; -} - -static ssize_t at24_eeprom_read_i2c(struct at24_data *at24, char *buf, - unsigned int offset, size_t count) -{ - unsigned long timeout, read_time; - struct i2c_client *client; - struct i2c_msg msg[2]; - int status, i; - u8 msgbuf[2]; - - memset(msg, 0, sizeof(msg)); - client = at24_translate_offset(at24, &offset); - - if (count > io_limit) - count = io_limit; + unsigned int bits; + size_t remainder; /* - * When we have a better choice than SMBus calls, use a combined I2C - * message. Write address; then read up to io_limit data bytes. Note - * that read page rollover helps us here (unlike writes). msgbuf is - * u8 and will cast to our needs. + * In case of multi-address chips that don't rollover reads to + * the next slave address: truncate the count to the slave boundary, + * so that the read never straddles slaves. */ - i = 0; - if (at24->chip.flags & AT24_FLAG_ADDR16) - msgbuf[i++] = offset >> 8; - msgbuf[i++] = offset; - - msg[0].addr = client->addr; - msg[0].buf = msgbuf; - msg[0].len = i; - - msg[1].addr = client->addr; - msg[1].flags = I2C_M_RD; - msg[1].buf = buf; - msg[1].len = count; - - loop_until_timeout(timeout, read_time) { - status = i2c_transfer(client->adapter, msg, 2); - if (status == 2) - status = count; - - dev_dbg(&client->dev, "read %zu@%d --> %d (%ld)\n", - count, offset, status, jiffies); - - if (status == count) - return count; + if (at24->chip.flags & AT24_FLAG_NO_RDROL) { + bits = (at24->chip.flags & AT24_FLAG_ADDR16) ? 16 : 8; + remainder = BIT(bits) - offset; + if (count > remainder) + count = remainder; } - return -ETIMEDOUT; + if (count > at24_io_limit) + count = at24_io_limit; + + return count; } -static ssize_t at24_eeprom_read_serial(struct at24_data *at24, char *buf, - unsigned int offset, size_t count) +static ssize_t at24_regmap_read(struct at24_data *at24, char *buf, + unsigned int offset, size_t count) { unsigned long timeout, read_time; + struct at24_client *at24_client; struct i2c_client *client; - struct i2c_msg msg[2]; - u8 addrbuf[2]; - int status; - - client = at24_translate_offset(at24, &offset); - - memset(msg, 0, sizeof(msg)); - msg[0].addr = client->addr; - msg[0].buf = addrbuf; - - /* - * The address pointer of the device is shared between the regular - * EEPROM array and the serial number block. The dummy write (part of - * the sequential read protocol) ensures the address pointer is reset - * to the desired position. - */ - if (at24->chip.flags & AT24_FLAG_ADDR16) { - /* - * For 16 bit address pointers, the word address must contain - * a '10' sequence in bits 11 and 10 regardless of the - * intended position of the address pointer. - */ - addrbuf[0] = 0x08; - addrbuf[1] = offset; - msg[0].len = 2; - } else { - /* - * Otherwise the word address must begin with a '10' sequence, - * regardless of the intended address. - */ - addrbuf[0] = 0x80 + offset; - msg[0].len = 1; - } - - msg[1].addr = client->addr; - msg[1].flags = I2C_M_RD; - msg[1].buf = buf; - msg[1].len = count; + struct regmap *regmap; + int ret; - loop_until_timeout(timeout, read_time) { - status = i2c_transfer(client->adapter, msg, 2); - if (status == 2) - return count; - } + at24_client = at24_translate_offset(at24, &offset); + regmap = at24_client->regmap; + client = at24_client->client; + count = at24_adjust_read_count(at24, offset, count); - return -ETIMEDOUT; -} + /* adjust offset for mac and serial read ops */ + offset += at24->offset_adj; -static ssize_t at24_eeprom_read_mac(struct at24_data *at24, char *buf, - unsigned int offset, size_t count) -{ - unsigned long timeout, read_time; - struct i2c_client *client; - struct i2c_msg msg[2]; - u8 addrbuf[2]; - int status; - - client = at24_translate_offset(at24, &offset); - - memset(msg, 0, sizeof(msg)); - msg[0].addr = client->addr; - msg[0].buf = addrbuf; - /* EUI-48 starts from 0x9a, EUI-64 from 0x98 */ - addrbuf[0] = 0xa0 - at24->chip.byte_len + offset; - msg[0].len = 1; - msg[1].addr = client->addr; - msg[1].flags = I2C_M_RD; - msg[1].buf = buf; - msg[1].len = count; - - loop_until_timeout(timeout, read_time) { - status = i2c_transfer(client->adapter, msg, 2); - if (status == 2) + at24_loop_until_timeout(timeout, read_time) { + ret = regmap_bulk_read(regmap, offset, buf, count); + dev_dbg(&client->dev, "read %zu@%d --> %d (%ld)\n", + count, offset, ret, jiffies); + if (!ret) return count; } @@ -454,7 +330,7 @@ static ssize_t at24_eeprom_read_mac(struct at24_data *at24, char *buf, static size_t at24_adjust_write_count(struct at24_data *at24, unsigned int offset, size_t count) { - unsigned next_page; + unsigned int next_page; /* write_max is at most a page */ if (count > at24->write_max) @@ -468,91 +344,25 @@ static size_t at24_adjust_write_count(struct at24_data *at24, return count; } -static ssize_t at24_eeprom_write_smbus_block(struct at24_data *at24, - const char *buf, - unsigned int offset, size_t count) +static ssize_t at24_regmap_write(struct at24_data *at24, const char *buf, + unsigned int offset, size_t count) { unsigned long timeout, write_time; + struct at24_client *at24_client; struct i2c_client *client; - ssize_t status = 0; - - client = at24_translate_offset(at24, &offset); - count = at24_adjust_write_count(at24, offset, count); - - loop_until_timeout(timeout, write_time) { - status = i2c_smbus_write_i2c_block_data(client, - offset, count, buf); - if (status == 0) - status = count; - - dev_dbg(&client->dev, "write %zu@%d --> %zd (%ld)\n", - count, offset, status, jiffies); - - if (status == count) - return count; - } - - return -ETIMEDOUT; -} - -static ssize_t at24_eeprom_write_smbus_byte(struct at24_data *at24, - const char *buf, - unsigned int offset, size_t count) -{ - unsigned long timeout, write_time; - struct i2c_client *client; - ssize_t status = 0; - - client = at24_translate_offset(at24, &offset); - - loop_until_timeout(timeout, write_time) { - status = i2c_smbus_write_byte_data(client, offset, buf[0]); - if (status == 0) - status = count; - - dev_dbg(&client->dev, "write %zu@%d --> %zd (%ld)\n", - count, offset, status, jiffies); - - if (status == count) - return count; - } - - return -ETIMEDOUT; -} - -static ssize_t at24_eeprom_write_i2c(struct at24_data *at24, const char *buf, - unsigned int offset, size_t count) -{ - unsigned long timeout, write_time; - struct i2c_client *client; - struct i2c_msg msg; - ssize_t status = 0; - int i = 0; + struct regmap *regmap; + int ret; - client = at24_translate_offset(at24, &offset); + at24_client = at24_translate_offset(at24, &offset); + regmap = at24_client->regmap; + client = at24_client->client; count = at24_adjust_write_count(at24, offset, count); - msg.addr = client->addr; - msg.flags = 0; - - /* msg.buf is u8 and casts will mask the values */ - msg.buf = at24->writebuf; - if (at24->chip.flags & AT24_FLAG_ADDR16) - msg.buf[i++] = offset >> 8; - - msg.buf[i++] = offset; - memcpy(&msg.buf[i], buf, count); - msg.len = i + count; - - loop_until_timeout(timeout, write_time) { - status = i2c_transfer(client->adapter, &msg, 1); - if (status == 1) - status = count; - - dev_dbg(&client->dev, "write %zu@%d --> %zd (%ld)\n", - count, offset, status, jiffies); - - if (status == count) + at24_loop_until_timeout(timeout, write_time) { + ret = regmap_bulk_write(regmap, offset, buf, count); + dev_dbg(&client->dev, "write %zu@%d --> %d (%ld)\n", + count, offset, ret, jiffies); + if (!ret) return count; } @@ -562,7 +372,7 @@ static ssize_t at24_eeprom_write_i2c(struct at24_data *at24, const char *buf, static int at24_read(void *priv, unsigned int off, void *val, size_t count) { struct at24_data *at24 = priv; - struct device *dev = &at24->client[0]->dev; + struct device *dev = &at24->client[0].client->dev; char *buf = val; int ret; @@ -587,7 +397,7 @@ static int at24_read(void *priv, unsigned int off, void *val, size_t count) while (count) { int status; - status = at24->read_func(at24, buf, off, count); + status = at24_regmap_read(at24, buf, off, count); if (status < 0) { mutex_unlock(&at24->lock); pm_runtime_put(dev); @@ -608,7 +418,7 @@ static int at24_read(void *priv, unsigned int off, void *val, size_t count) static int at24_write(void *priv, unsigned int off, void *val, size_t count) { struct at24_data *at24 = priv; - struct device *dev = &at24->client[0]->dev; + struct device *dev = &at24->client[0].client->dev; char *buf = val; int ret; @@ -629,12 +439,14 @@ static int at24_write(void *priv, unsigned int off, void *val, size_t count) * from this host, but not from other I2C masters. */ mutex_lock(&at24->lock); + gpiod_set_value_cansleep(at24->wp_gpio, 0); while (count) { int status; - status = at24->write_func(at24, buf, off, count); + status = at24_regmap_write(at24, buf, off, count); if (status < 0) { + gpiod_set_value_cansleep(at24->wp_gpio, 1); mutex_unlock(&at24->lock); pm_runtime_put(dev); return status; @@ -644,6 +456,7 @@ static int at24_write(void *priv, unsigned int off, void *val, size_t count) count -= status; } + gpiod_set_value_cansleep(at24->wp_gpio, 1); mutex_unlock(&at24->lock); pm_runtime_put(dev); @@ -658,6 +471,8 @@ static void at24_get_pdata(struct device *dev, struct at24_platform_data *chip) if (device_property_present(dev, "read-only")) chip->flags |= AT24_FLAG_READONLY; + if (device_property_present(dev, "no-read-rollover")) + chip->flags |= AT24_FLAG_NO_RDROL; err = device_property_read_u32(dev, "size", &val); if (!err) @@ -676,16 +491,38 @@ static void at24_get_pdata(struct device *dev, struct at24_platform_data *chip) } } +static unsigned int at24_get_offset_adj(u8 flags, unsigned int byte_len) +{ + if (flags & AT24_FLAG_MAC) { + /* EUI-48 starts from 0x9a, EUI-64 from 0x98 */ + return 0xa0 - byte_len; + } else if (flags & AT24_FLAG_SERIAL && flags & AT24_FLAG_ADDR16) { + /* + * For 16 bit address pointers, the word address must contain + * a '10' sequence in bits 11 and 10 regardless of the + * intended position of the address pointer. + */ + return 0x0800; + } else if (flags & AT24_FLAG_SERIAL) { + /* + * Otherwise the word address must begin with a '10' sequence, + * regardless of the intended address. + */ + return 0x0080; + } else { + return 0; + } +} + static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) { - struct at24_platform_data chip; - kernel_ulong_t magic = 0; + struct at24_platform_data chip = { 0 }; + const struct at24_chip_data *cd = NULL; bool writable; - int use_smbus = 0; - int use_smbus_write = 0; struct at24_data *at24; int err; - unsigned i, num_addresses; + unsigned int i, num_addresses; + struct regmap_config regmap_config = { }; u8 test_byte; if (client->dev.platform_data) { @@ -698,28 +535,22 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) */ if (client->dev.of_node && of_match_device(at24_of_match, &client->dev)) { - magic = (kernel_ulong_t) - of_device_get_match_data(&client->dev); + cd = of_device_get_match_data(&client->dev); } else if (id) { - magic = id->driver_data; + cd = (void *)id->driver_data; } else { const struct acpi_device_id *aid; aid = acpi_match_device(at24_acpi_ids, &client->dev); if (aid) - magic = aid->driver_data; + cd = (void *)aid->driver_data; } - if (!magic) + if (!cd) return -ENODEV; - chip.byte_len = BIT(magic & AT24_BITMASK(AT24_SIZE_BYTELEN)); - magic >>= AT24_SIZE_BYTELEN; - chip.flags = magic & AT24_BITMASK(AT24_SIZE_FLAGS); - + chip.byte_len = cd->byte_len; + chip.flags = cd->flags; at24_get_pdata(&client->dev, &chip); - - chip.setup = NULL; - chip.context = NULL; } if (!is_power_of_2(chip.byte_len)) @@ -733,43 +564,10 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) dev_warn(&client->dev, "page_size looks suspicious (no power of 2)!\n"); - /* - * REVISIT: the size of the EUI-48 byte array is 6 in at24mac402, while - * the call to ilog2() in AT24_DEVICE_MAGIC() rounds it down to 4. - * - * Eventually we'll get rid of the magic values altoghether in favor of - * real structs, but for now just manually set the right size. - */ - if (chip.flags & AT24_FLAG_MAC && chip.byte_len == 4) - chip.byte_len = 6; - - /* Use I2C operations unless we're stuck with SMBus extensions. */ - if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { - if (chip.flags & AT24_FLAG_ADDR16) - return -EPFNOSUPPORT; - - if (i2c_check_functionality(client->adapter, - I2C_FUNC_SMBUS_READ_I2C_BLOCK)) { - use_smbus = I2C_SMBUS_I2C_BLOCK_DATA; - } else if (i2c_check_functionality(client->adapter, - I2C_FUNC_SMBUS_READ_WORD_DATA)) { - use_smbus = I2C_SMBUS_WORD_DATA; - } else if (i2c_check_functionality(client->adapter, - I2C_FUNC_SMBUS_READ_BYTE_DATA)) { - use_smbus = I2C_SMBUS_BYTE_DATA; - } else { - return -EPFNOSUPPORT; - } - - if (i2c_check_functionality(client->adapter, - I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) { - use_smbus_write = I2C_SMBUS_I2C_BLOCK_DATA; - } else if (i2c_check_functionality(client->adapter, - I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) { - use_smbus_write = I2C_SMBUS_BYTE_DATA; - chip.page_size = 1; - } - } + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C) && + !i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) + chip.page_size = 1; if (chip.flags & AT24_FLAG_TAKE8ADDR) num_addresses = 8; @@ -777,16 +575,28 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) num_addresses = DIV_ROUND_UP(chip.byte_len, (chip.flags & AT24_FLAG_ADDR16) ? 65536 : 256); + regmap_config.val_bits = 8; + regmap_config.reg_bits = (chip.flags & AT24_FLAG_ADDR16) ? 16 : 8; + at24 = devm_kzalloc(&client->dev, sizeof(struct at24_data) + - num_addresses * sizeof(struct i2c_client *), GFP_KERNEL); + num_addresses * sizeof(struct at24_client), GFP_KERNEL); if (!at24) return -ENOMEM; mutex_init(&at24->lock); - at24->use_smbus = use_smbus; - at24->use_smbus_write = use_smbus_write; at24->chip = chip; at24->num_addresses = num_addresses; + at24->offset_adj = at24_get_offset_adj(chip.flags, chip.byte_len); + + at24->wp_gpio = devm_gpiod_get_optional(&client->dev, + "wp", GPIOD_OUT_HIGH); + if (IS_ERR(at24->wp_gpio)) + return PTR_ERR(at24->wp_gpio); + + at24->client[0].client = client; + at24->client[0].regmap = devm_regmap_init_i2c(client, ®map_config); + if (IS_ERR(at24->client[0].regmap)) + return PTR_ERR(at24->client[0].regmap); if ((chip.flags & AT24_FLAG_SERIAL) && (chip.flags & AT24_FLAG_MAC)) { dev_err(&client->dev, @@ -794,59 +604,32 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) return -EINVAL; } - if (chip.flags & AT24_FLAG_SERIAL) { - at24->read_func = at24_eeprom_read_serial; - } else if (chip.flags & AT24_FLAG_MAC) { - at24->read_func = at24_eeprom_read_mac; - } else { - at24->read_func = at24->use_smbus ? at24_eeprom_read_smbus - : at24_eeprom_read_i2c; - } - - if (at24->use_smbus) { - if (at24->use_smbus_write == I2C_SMBUS_I2C_BLOCK_DATA) - at24->write_func = at24_eeprom_write_smbus_block; - else - at24->write_func = at24_eeprom_write_smbus_byte; - } else { - at24->write_func = at24_eeprom_write_i2c; - } - writable = !(chip.flags & AT24_FLAG_READONLY); if (writable) { - if (!use_smbus || use_smbus_write) { - - unsigned write_max = chip.page_size; - - if (write_max > io_limit) - write_max = io_limit; - if (use_smbus && write_max > I2C_SMBUS_BLOCK_MAX) - write_max = I2C_SMBUS_BLOCK_MAX; - at24->write_max = write_max; - - /* buffer (data + address at the beginning) */ - at24->writebuf = devm_kzalloc(&client->dev, - write_max + 2, GFP_KERNEL); - if (!at24->writebuf) - return -ENOMEM; - } else { - dev_warn(&client->dev, - "cannot write due to controller restrictions."); - } + at24->write_max = min_t(unsigned int, + chip.page_size, at24_io_limit); + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C) && + at24->write_max > I2C_SMBUS_BLOCK_MAX) + at24->write_max = I2C_SMBUS_BLOCK_MAX; } - at24->client[0] = client; - /* use dummy devices for multiple-address chips */ for (i = 1; i < num_addresses; i++) { - at24->client[i] = i2c_new_dummy(client->adapter, - client->addr + i); - if (!at24->client[i]) { + at24->client[i].client = i2c_new_dummy(client->adapter, + client->addr + i); + if (!at24->client[i].client) { dev_err(&client->dev, "address 0x%02x unavailable\n", client->addr + i); err = -EADDRINUSE; goto err_clients; } + at24->client[i].regmap = devm_regmap_init_i2c( + at24->client[i].client, + ®map_config); + if (IS_ERR(at24->client[i].regmap)) { + err = PTR_ERR(at24->client[i].regmap); + goto err_clients; + } } i2c_set_clientdata(client, at24); @@ -890,12 +673,6 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) dev_info(&client->dev, "%u byte %s EEPROM, %s, %u bytes/write\n", chip.byte_len, client->name, writable ? "writable" : "read-only", at24->write_max); - if (use_smbus == I2C_SMBUS_WORD_DATA || - use_smbus == I2C_SMBUS_BYTE_DATA) { - dev_notice(&client->dev, "Falling back to %s reads, " - "performance will suffer\n", use_smbus == - I2C_SMBUS_WORD_DATA ? "word" : "byte"); - } /* export data to kernel code */ if (chip.setup) @@ -905,8 +682,8 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) err_clients: for (i = 1; i < num_addresses; i++) - if (at24->client[i]) - i2c_unregister_device(at24->client[i]); + if (at24->client[i].client) + i2c_unregister_device(at24->client[i].client); pm_runtime_disable(&client->dev); @@ -923,7 +700,7 @@ static int at24_remove(struct i2c_client *client) nvmem_unregister(at24->nvmem); for (i = 1; i < at24->num_addresses; i++) - i2c_unregister_device(at24->client[i]); + i2c_unregister_device(at24->client[i].client); pm_runtime_disable(&client->dev); pm_runtime_set_suspended(&client->dev); @@ -946,12 +723,12 @@ static struct i2c_driver at24_driver = { static int __init at24_init(void) { - if (!io_limit) { - pr_err("at24: io_limit must not be 0!\n"); + if (!at24_io_limit) { + pr_err("at24: at24_io_limit must not be 0!\n"); return -EINVAL; } - io_limit = rounddown_pow_of_two(io_limit); + at24_io_limit = rounddown_pow_of_two(at24_io_limit); return i2c_add_driver(&at24_driver); } module_init(at24_init); diff --git a/include/linux/i2c.h b/include/linux/i2c.h index 0f77440..419a38e 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -55,7 +55,7 @@ typedef int (*i2c_slave_cb_t)(struct i2c_client *, enum i2c_slave_event, u8 *); struct module; struct property_entry; -#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) +#if IS_ENABLED(CONFIG_I2C) /* * The master routines are the ones normally used to transmit data to devices * on a bus (or read from them). Apart from two basic transfer functions to @@ -63,10 +63,68 @@ struct property_entry; * transmit an arbitrary number of messages without interruption. * @count must be be less than 64k since msg.len is u16. */ -extern int i2c_master_send(const struct i2c_client *client, const char *buf, - int count); -extern int i2c_master_recv(const struct i2c_client *client, char *buf, - int count); +extern int i2c_transfer_buffer_flags(const struct i2c_client *client, + char *buf, int count, u16 flags); + +/** + * i2c_master_recv - issue a single I2C message in master receive mode + * @client: Handle to slave device + * @buf: Where to store data read from slave + * @count: How many bytes to read, must be less than 64k since msg.len is u16 + * + * Returns negative errno, or else the number of bytes read. + */ +static inline int i2c_master_recv(const struct i2c_client *client, + char *buf, int count) +{ + return i2c_transfer_buffer_flags(client, buf, count, I2C_M_RD); +}; + +/** + * i2c_master_recv_dmasafe - issue a single I2C message in master receive mode + * using a DMA safe buffer + * @client: Handle to slave device + * @buf: Where to store data read from slave, must be safe to use with DMA + * @count: How many bytes to read, must be less than 64k since msg.len is u16 + * + * Returns negative errno, or else the number of bytes read. + */ +static inline int i2c_master_recv_dmasafe(const struct i2c_client *client, + char *buf, int count) +{ + return i2c_transfer_buffer_flags(client, buf, count, + I2C_M_RD | I2C_M_DMA_SAFE); +}; + +/** + * i2c_master_send - issue a single I2C message in master transmit mode + * @client: Handle to slave device + * @buf: Data that will be written to the slave + * @count: How many bytes to write, must be less than 64k since msg.len is u16 + * + * Returns negative errno, or else the number of bytes written. + */ +static inline int i2c_master_send(const struct i2c_client *client, + const char *buf, int count) +{ + return i2c_transfer_buffer_flags(client, (char *)buf, count, 0); +}; + +/** + * i2c_master_send_dmasafe - issue a single I2C message in master transmit mode + * using a DMA safe buffer + * @client: Handle to slave device + * @buf: Data that will be written to the slave, must be safe to use with DMA + * @count: How many bytes to write, must be less than 64k since msg.len is u16 + * + * Returns negative errno, or else the number of bytes written. + */ +static inline int i2c_master_send_dmasafe(const struct i2c_client *client, + const char *buf, int count) +{ + return i2c_transfer_buffer_flags(client, (char *)buf, count, + I2C_M_DMA_SAFE); +}; /* Transfer num messages. */ @@ -354,7 +412,7 @@ struct i2c_board_info { .type = dev_type, .addr = (dev_addr) -#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) +#if IS_ENABLED(CONFIG_I2C) /* Add-on boards should register/unregister their devices; e.g. a board * with integrated I2C, a config eeprom, sensors, and a codec that's * used in conjunction with the primary hardware. @@ -485,40 +543,43 @@ struct i2c_timings { /** * struct i2c_bus_recovery_info - I2C bus recovery information * @recover_bus: Recover routine. Either pass driver's recover_bus() routine, or - * i2c_generic_scl_recovery() or i2c_generic_gpio_recovery(). + * i2c_generic_scl_recovery(). * @get_scl: This gets current value of SCL line. Mandatory for generic SCL - * recovery. Used internally for generic GPIO recovery. - * @set_scl: This sets/clears SCL line. Mandatory for generic SCL recovery. Used - * internally for generic GPIO recovery. + * recovery. Populated internally for generic GPIO recovery. + * @set_scl: This sets/clears the SCL line. Mandatory for generic SCL recovery. + * Populated internally for generic GPIO recovery. * @get_sda: This gets current value of SDA line. Optional for generic SCL - * recovery. Used internally, if sda_gpio is a valid GPIO, for generic GPIO - * recovery. + * recovery. Populated internally, if sda_gpio is a valid GPIO, for generic + * GPIO recovery. + * @set_sda: This sets/clears the SDA line. Optional for generic SCL recovery. + * Populated internally, if sda_gpio is a valid GPIO, for generic GPIO + * recovery. * @prepare_recovery: This will be called before starting recovery. Platform may * configure padmux here for SDA/SCL line or something else they want. * @unprepare_recovery: This will be called after completing recovery. Platform * may configure padmux here for SDA/SCL line or something else they want. - * @scl_gpio: gpio number of the SCL line. Only required for GPIO recovery. - * @sda_gpio: gpio number of the SDA line. Only required for GPIO recovery. + * @scl_gpiod: gpiod of the SCL line. Only required for GPIO recovery. + * @sda_gpiod: gpiod of the SDA line. Only required for GPIO recovery. */ struct i2c_bus_recovery_info { - int (*recover_bus)(struct i2c_adapter *); + int (*recover_bus)(struct i2c_adapter *adap); - int (*get_scl)(struct i2c_adapter *); - void (*set_scl)(struct i2c_adapter *, int val); - int (*get_sda)(struct i2c_adapter *); + int (*get_scl)(struct i2c_adapter *adap); + void (*set_scl)(struct i2c_adapter *adap, int val); + int (*get_sda)(struct i2c_adapter *adap); + void (*set_sda)(struct i2c_adapter *adap, int val); - void (*prepare_recovery)(struct i2c_adapter *); - void (*unprepare_recovery)(struct i2c_adapter *); + void (*prepare_recovery)(struct i2c_adapter *adap); + void (*unprepare_recovery)(struct i2c_adapter *adap); /* gpio recovery */ - int scl_gpio; - int sda_gpio; + struct gpio_desc *scl_gpiod; + struct gpio_desc *sda_gpiod; }; int i2c_recover_bus(struct i2c_adapter *adap); /* Generic recovery routines */ -int i2c_generic_gpio_recovery(struct i2c_adapter *adap); int i2c_generic_scl_recovery(struct i2c_adapter *adap); /** @@ -706,7 +767,7 @@ i2c_unlock_adapter(struct i2c_adapter *adapter) /* administration... */ -#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) +#if IS_ENABLED(CONFIG_I2C) extern int i2c_add_adapter(struct i2c_adapter *); extern void i2c_del_adapter(struct i2c_adapter *); extern int i2c_add_numbered_adapter(struct i2c_adapter *); @@ -769,6 +830,9 @@ static inline u8 i2c_8bit_addr_from_msg(const struct i2c_msg *msg) return (msg->addr << 1) | (msg->flags & I2C_M_RD ? 1 : 0); } +u8 *i2c_get_dma_safe_msg_buf(struct i2c_msg *msg, unsigned int threshold); +void i2c_release_dma_safe_msg_buf(struct i2c_msg *msg, u8 *buf); + int i2c_handle_smbus_host_notify(struct i2c_adapter *adap, unsigned short addr); /** * module_i2c_driver() - Helper macro for registering a modular I2C driver diff --git a/include/linux/platform_data/at24.h b/include/linux/platform_data/at24.h index 271a4e2..63507ff 100644 --- a/include/linux/platform_data/at24.h +++ b/include/linux/platform_data/at24.h @@ -50,6 +50,8 @@ struct at24_platform_data { #define AT24_FLAG_TAKE8ADDR BIT(4) /* take always 8 addresses (24c00) */ #define AT24_FLAG_SERIAL BIT(3) /* factory-programmed serial number */ #define AT24_FLAG_MAC BIT(2) /* factory-programmed mac address */ +#define AT24_FLAG_NO_RDROL BIT(1) /* does not auto-rollover reads to */ + /* the next slave address */ void (*setup)(struct nvmem_device *nvmem, void *context); void *context; diff --git a/include/linux/platform_data/i2c-davinci.h b/include/linux/platform_data/i2c-davinci.h index 89fd347..98967df 100644 --- a/include/linux/platform_data/i2c-davinci.h +++ b/include/linux/platform_data/i2c-davinci.h @@ -16,9 +16,8 @@ struct davinci_i2c_platform_data { unsigned int bus_freq; /* standard bus frequency (kHz) */ unsigned int bus_delay; /* post-transaction delay (usec) */ - unsigned int sda_pin; /* GPIO pin ID to use for SDA */ - unsigned int scl_pin; /* GPIO pin ID to use for SCL */ - bool has_pfunc; /*chip has a ICPFUNC register */ + bool gpio_recovery; /* Use GPIO recovery method */ + bool has_pfunc; /* Chip has a ICPFUNC register */ }; /* for board setup code */ diff --git a/include/uapi/linux/i2c.h b/include/uapi/linux/i2c.h index fe64803..f71a175 100644 --- a/include/uapi/linux/i2c.h +++ b/include/uapi/linux/i2c.h @@ -72,6 +72,9 @@ struct i2c_msg { #define I2C_M_RD 0x0001 /* read data, from slave to master */ /* I2C_M_RD is guaranteed to be 0x0001! */ #define I2C_M_TEN 0x0010 /* this is a ten bit chip address */ +#define I2C_M_DMA_SAFE 0x0200 /* the buffer of this message is DMA safe */ + /* makes only sense in kernelspace */ + /* userspace buffers are copied anyway */ #define I2C_M_RECV_LEN 0x0400 /* length will be first received byte */ #define I2C_M_NO_RD_ACK 0x0800 /* if I2C_FUNC_PROTOCOL_MANGLING */ #define I2C_M_IGNORE_NAK 0x1000 /* if I2C_FUNC_PROTOCOL_MANGLING */ |
