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authorLinus Torvalds <torvalds@linux-foundation.org>2014-08-05 16:18:13 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-08-05 16:18:13 -0700
commit1325b6550a7b9cda52ee4c0da04fa9f93d2618fc (patch)
tree07c5f64e7c3484a21553378ca3f256a3ce569b85 /drivers/spi
parentdc7aafba6bfa1ea5806c6ac402e690682f950f75 (diff)
parentfab6a0410d20ef09238ef54b8726d170578da752 (diff)
downloadop-kernel-dev-1325b6550a7b9cda52ee4c0da04fa9f93d2618fc.zip
op-kernel-dev-1325b6550a7b9cda52ee4c0da04fa9f93d2618fc.tar.gz
Merge tag 'spi-v3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi
Pull spi updates from Mark Brown: "A quiet release, more bug fixes than anything else. A few things do stand out though: - updates to several drivers to move towards the standard GPIO chip select handling in the core. - DMA support for the SH MSIOF driver. - support for Rockchip SPI controllers (their first mainline submission)" * tag 'spi-v3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi: (64 commits) spi: davinci: use spi_device.cs_gpio to store gpio cs per spi device spi: davinci: add support to configure gpio cs through dt spi/pl022: Explicitly truncate large bitmask spi/atmel: Fix pointer to int conversion warnings on 64 bit builds spi: davinci: fix to support more than 2 chip selects spi: topcliff-pch: don't hardcode PCI slot to get DMA device spi: orion: fix incorrect handling of cell-index DT property spi: orion: Fix error return code in orion_spi_probe() spi/rockchip: fix error return code in rockchip_spi_probe() spi/rockchip: remove redundant dev_err call in rockchip_spi_probe() spi/rockchip: remove duplicated include from spi-rockchip.c ARM: dts: fix the chip select gpios definition in the SPI nodes spi: s3c64xx: Update binding documentation spi: s3c64xx: use the generic SPI "cs-gpios" property spi: s3c64xx: Revert "spi: s3c64xx: Added provision for dedicated cs pin" spi: atmel: Use dmaengine_prep_slave_sg() API spi: topcliff-pch: Update error messages for dmaengine_prep_slave_sg() API spi: sh-msiof: Use correct device for DMA mapping with IOMMU spi: sh-msiof: Handle dmaengine_prep_slave_single() failures gracefully spi: rspi: Handle dmaengine_prep_slave_sg() failures gracefully ...
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/Kconfig16
-rw-r--r--drivers/spi/Makefile1
-rw-r--r--drivers/spi/spi-adi-v3.c5
-rw-r--r--drivers/spi/spi-atmel.c22
-rw-r--r--drivers/spi/spi-au1550.c6
-rw-r--r--drivers/spi/spi-cadence.c37
-rw-r--r--drivers/spi/spi-clps711x.c2
-rw-r--r--drivers/spi/spi-davinci.c72
-rw-r--r--drivers/spi/spi-dw-mmio.c19
-rw-r--r--drivers/spi/spi-efm32.c8
-rw-r--r--drivers/spi/spi-falcon.c2
-rw-r--r--drivers/spi/spi-fsl-lib.c2
-rw-r--r--drivers/spi/spi-fsl-spi.c2
-rw-r--r--drivers/spi/spi-omap-100k.c2
-rw-r--r--drivers/spi/spi-omap-uwire.c11
-rw-r--r--drivers/spi/spi-omap2-mcspi.c14
-rw-r--r--drivers/spi/spi-orion.c78
-rw-r--r--drivers/spi/spi-pl022.c2
-rw-r--r--drivers/spi/spi-qup.c36
-rw-r--r--drivers/spi/spi-rockchip.c837
-rw-r--r--drivers/spi/spi-rspi.c45
-rw-r--r--drivers/spi/spi-s3c64xx.c54
-rw-r--r--drivers/spi/spi-sh-hspi.c2
-rw-r--r--drivers/spi/spi-sh-msiof.c527
-rw-r--r--drivers/spi/spi-sh.c15
-rw-r--r--drivers/spi/spi-topcliff-pch.c12
-rw-r--r--drivers/spi/spi-xilinx.c2
-rw-r--r--drivers/spi/spi.c12
28 files changed, 1623 insertions, 220 deletions
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 213b5cb..62e2242 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -382,9 +382,21 @@ config SPI_PXA2XX
config SPI_PXA2XX_PCI
def_tristate SPI_PXA2XX && PCI
+config SPI_ROCKCHIP
+ tristate "Rockchip SPI controller driver"
+ depends on ARM || ARM64 || AVR32 || HEXAGON || MIPS || SUPERH
+ help
+ This selects a driver for Rockchip SPI controller.
+
+ If you say yes to this option, support will be included for
+ RK3066, RK3188 and RK3288 families of SPI controller.
+ Rockchip SPI controller support DMA transport and PIO mode.
+ The main usecase of this controller is to use spi flash as boot
+ device.
+
config SPI_RSPI
tristate "Renesas RSPI/QSPI controller"
- depends on (SUPERH && SH_DMAE_BASE) || ARCH_SHMOBILE
+ depends on SUPERH || ARCH_SHMOBILE || COMPILE_TEST
help
SPI driver for Renesas RSPI and QSPI blocks.
@@ -434,7 +446,7 @@ config SPI_SC18IS602
config SPI_SH_MSIOF
tristate "SuperH MSIOF SPI controller"
- depends on HAVE_CLK
+ depends on HAVE_CLK && HAS_DMA
depends on SUPERH || ARCH_SHMOBILE || COMPILE_TEST
help
SPI driver for SuperH and SH Mobile MSIOF blocks.
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 929c9f5..762da07 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -61,6 +61,7 @@ spi-pxa2xx-platform-$(CONFIG_SPI_PXA2XX_DMA) += spi-pxa2xx-dma.o
obj-$(CONFIG_SPI_PXA2XX) += spi-pxa2xx-platform.o
obj-$(CONFIG_SPI_PXA2XX_PCI) += spi-pxa2xx-pci.o
obj-$(CONFIG_SPI_QUP) += spi-qup.o
+obj-$(CONFIG_SPI_ROCKCHIP) += spi-rockchip.o
obj-$(CONFIG_SPI_RSPI) += spi-rspi.o
obj-$(CONFIG_SPI_S3C24XX) += spi-s3c24xx-hw.o
spi-s3c24xx-hw-y := spi-s3c24xx.o
diff --git a/drivers/spi/spi-adi-v3.c b/drivers/spi/spi-adi-v3.c
index dcb2287..19ea8fb 100644
--- a/drivers/spi/spi-adi-v3.c
+++ b/drivers/spi/spi-adi-v3.c
@@ -660,10 +660,9 @@ static int adi_spi_setup(struct spi_device *spi)
struct adi_spi3_chip *chip_info = spi->controller_data;
chip = kzalloc(sizeof(*chip), GFP_KERNEL);
- if (!chip) {
- dev_err(&spi->dev, "can not allocate chip data\n");
+ if (!chip)
return -ENOMEM;
- }
+
if (chip_info) {
if (chip_info->control & ~ctl_reg) {
dev_err(&spi->dev,
diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index 92a6f0d..113c83f 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -597,21 +597,15 @@ static int atmel_spi_next_xfer_dma_submit(struct spi_master *master,
goto err_exit;
/* Send both scatterlists */
- rxdesc = rxchan->device->device_prep_slave_sg(rxchan,
- &as->dma.sgrx,
- 1,
- DMA_FROM_DEVICE,
- DMA_PREP_INTERRUPT | DMA_CTRL_ACK,
- NULL);
+ rxdesc = dmaengine_prep_slave_sg(rxchan, &as->dma.sgrx, 1,
+ DMA_FROM_DEVICE,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!rxdesc)
goto err_dma;
- txdesc = txchan->device->device_prep_slave_sg(txchan,
- &as->dma.sgtx,
- 1,
- DMA_TO_DEVICE,
- DMA_PREP_INTERRUPT | DMA_CTRL_ACK,
- NULL);
+ txdesc = dmaengine_prep_slave_sg(txchan, &as->dma.sgtx, 1,
+ DMA_TO_DEVICE,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!txdesc)
goto err_dma;
@@ -1018,7 +1012,7 @@ static int atmel_spi_setup(struct spi_device *spi)
csr |= SPI_BF(DLYBCT, 0);
/* chipselect must have been muxed as GPIO (e.g. in board setup) */
- npcs_pin = (unsigned int)spi->controller_data;
+ npcs_pin = (unsigned long)spi->controller_data;
if (gpio_is_valid(spi->cs_gpio))
npcs_pin = spi->cs_gpio;
@@ -1253,7 +1247,7 @@ msg_done:
static void atmel_spi_cleanup(struct spi_device *spi)
{
struct atmel_spi_device *asd = spi->controller_state;
- unsigned gpio = (unsigned) spi->controller_data;
+ unsigned gpio = (unsigned long) spi->controller_data;
if (!asd)
return;
diff --git a/drivers/spi/spi-au1550.c b/drivers/spi/spi-au1550.c
index 67375a1..fb61464 100644
--- a/drivers/spi/spi-au1550.c
+++ b/drivers/spi/spi-au1550.c
@@ -925,8 +925,7 @@ err_no_txdma:
iounmap((void __iomem *)hw->regs);
err_ioremap:
- release_resource(hw->ioarea);
- kfree(hw->ioarea);
+ release_mem_region(r->start, sizeof(psc_spi_t));
err_no_iores:
err_no_pdata:
@@ -946,8 +945,7 @@ static int au1550_spi_remove(struct platform_device *pdev)
spi_bitbang_stop(&hw->bitbang);
free_irq(hw->irq, hw);
iounmap((void __iomem *)hw->regs);
- release_resource(hw->ioarea);
- kfree(hw->ioarea);
+ release_mem_region(r->start, sizeof(psc_spi_t));
if (hw->usedma) {
au1550_spi_dma_rxtmp_free(hw);
diff --git a/drivers/spi/spi-cadence.c b/drivers/spi/spi-cadence.c
index bb75897..562ff83 100644
--- a/drivers/spi/spi-cadence.c
+++ b/drivers/spi/spi-cadence.c
@@ -205,18 +205,30 @@ static void cdns_spi_chipselect(struct spi_device *spi, bool is_high)
static void cdns_spi_config_clock_mode(struct spi_device *spi)
{
struct cdns_spi *xspi = spi_master_get_devdata(spi->master);
- u32 ctrl_reg;
+ u32 ctrl_reg, new_ctrl_reg;
- ctrl_reg = cdns_spi_read(xspi, CDNS_SPI_CR_OFFSET);
+ new_ctrl_reg = ctrl_reg = cdns_spi_read(xspi, CDNS_SPI_CR_OFFSET);
/* Set the SPI clock phase and clock polarity */
- ctrl_reg &= ~(CDNS_SPI_CR_CPHA_MASK | CDNS_SPI_CR_CPOL_MASK);
+ new_ctrl_reg &= ~(CDNS_SPI_CR_CPHA_MASK | CDNS_SPI_CR_CPOL_MASK);
if (spi->mode & SPI_CPHA)
- ctrl_reg |= CDNS_SPI_CR_CPHA_MASK;
+ new_ctrl_reg |= CDNS_SPI_CR_CPHA_MASK;
if (spi->mode & SPI_CPOL)
- ctrl_reg |= CDNS_SPI_CR_CPOL_MASK;
-
- cdns_spi_write(xspi, CDNS_SPI_CR_OFFSET, ctrl_reg);
+ new_ctrl_reg |= CDNS_SPI_CR_CPOL_MASK;
+
+ if (new_ctrl_reg != ctrl_reg) {
+ /*
+ * Just writing the CR register does not seem to apply the clock
+ * setting changes. This is problematic when changing the clock
+ * polarity as it will cause the SPI slave to see spurious clock
+ * transitions. To workaround the issue toggle the ER register.
+ */
+ cdns_spi_write(xspi, CDNS_SPI_ER_OFFSET,
+ CDNS_SPI_ER_DISABLE_MASK);
+ cdns_spi_write(xspi, CDNS_SPI_CR_OFFSET, new_ctrl_reg);
+ cdns_spi_write(xspi, CDNS_SPI_ER_OFFSET,
+ CDNS_SPI_ER_ENABLE_MASK);
+ }
}
/**
@@ -370,6 +382,12 @@ static irqreturn_t cdns_spi_irq(int irq, void *dev_id)
return status;
}
+static int cdns_prepare_message(struct spi_master *master,
+ struct spi_message *msg)
+{
+ cdns_spi_config_clock_mode(msg->spi);
+ return 0;
+}
/**
* cdns_transfer_one - Initiates the SPI transfer
@@ -416,8 +434,6 @@ static int cdns_prepare_transfer_hardware(struct spi_master *master)
{
struct cdns_spi *xspi = spi_master_get_devdata(master);
- cdns_spi_config_clock_mode(master->cur_msg->spi);
-
cdns_spi_write(xspi, CDNS_SPI_ER_OFFSET,
CDNS_SPI_ER_ENABLE_MASK);
@@ -532,6 +548,7 @@ static int cdns_spi_probe(struct platform_device *pdev)
xspi->is_decoded_cs = 0;
master->prepare_transfer_hardware = cdns_prepare_transfer_hardware;
+ master->prepare_message = cdns_prepare_message;
master->transfer_one = cdns_transfer_one;
master->unprepare_transfer_hardware = cdns_unprepare_transfer_hardware;
master->set_cs = cdns_spi_chipselect;
@@ -647,7 +664,7 @@ static int __maybe_unused cdns_spi_resume(struct device *dev)
static SIMPLE_DEV_PM_OPS(cdns_spi_dev_pm_ops, cdns_spi_suspend,
cdns_spi_resume);
-static struct of_device_id cdns_spi_of_match[] = {
+static const struct of_device_id cdns_spi_of_match[] = {
{ .compatible = "xlnx,zynq-spi-r1p6" },
{ .compatible = "cdns,spi-r1p6" },
{ /* end of table */ }
diff --git a/drivers/spi/spi-clps711x.c b/drivers/spi/spi-clps711x.c
index 4cd62f6..ce538da 100644
--- a/drivers/spi/spi-clps711x.c
+++ b/drivers/spi/spi-clps711x.c
@@ -184,8 +184,6 @@ static int spi_clps711x_probe(struct platform_device *pdev)
}
master->max_speed_hz = clk_get_rate(hw->spi_clk);
- platform_set_drvdata(pdev, master);
-
hw->syscon = syscon_regmap_lookup_by_pdevname("syscon.3");
if (IS_ERR(hw->syscon)) {
ret = PTR_ERR(hw->syscon);
diff --git a/drivers/spi/spi-davinci.c b/drivers/spi/spi-davinci.c
index 50f7509..276a388 100644
--- a/drivers/spi/spi-davinci.c
+++ b/drivers/spi/spi-davinci.c
@@ -30,6 +30,7 @@
#include <linux/edma.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/of_gpio.h>
#include <linux/spi/spi.h>
#include <linux/spi/spi_bitbang.h>
#include <linux/slab.h>
@@ -38,8 +39,6 @@
#define SPI_NO_RESOURCE ((resource_size_t)-1)
-#define SPI_MAX_CHIPSELECT 2
-
#define CS_DEFAULT 0xFF
#define SPIFMT_PHASE_MASK BIT(16)
@@ -142,7 +141,7 @@ struct davinci_spi {
void (*get_rx)(u32 rx_data, struct davinci_spi *);
u32 (*get_tx)(struct davinci_spi *);
- u8 bytes_per_word[SPI_MAX_CHIPSELECT];
+ u8 *bytes_per_word;
};
static struct davinci_spi_config davinci_spi_default_cfg;
@@ -213,13 +212,16 @@ static void davinci_spi_chipselect(struct spi_device *spi, int value)
u8 chip_sel = spi->chip_select;
u16 spidat1 = CS_DEFAULT;
bool gpio_chipsel = false;
+ int gpio;
dspi = spi_master_get_devdata(spi->master);
pdata = &dspi->pdata;
- if (pdata->chip_sel && chip_sel < pdata->num_chipselect &&
- pdata->chip_sel[chip_sel] != SPI_INTERN_CS)
+ if (spi->cs_gpio >= 0) {
+ /* SPI core parse and update master->cs_gpio */
gpio_chipsel = true;
+ gpio = spi->cs_gpio;
+ }
/*
* Board specific chip select logic decides the polarity and cs
@@ -227,9 +229,9 @@ static void davinci_spi_chipselect(struct spi_device *spi, int value)
*/
if (gpio_chipsel) {
if (value == BITBANG_CS_ACTIVE)
- gpio_set_value(pdata->chip_sel[chip_sel], 0);
+ gpio_set_value(gpio, spi->mode & SPI_CS_HIGH);
else
- gpio_set_value(pdata->chip_sel[chip_sel], 1);
+ gpio_set_value(gpio, !(spi->mode & SPI_CS_HIGH));
} else {
if (value == BITBANG_CS_ACTIVE) {
spidat1 |= SPIDAT1_CSHOLD_MASK;
@@ -392,17 +394,40 @@ static int davinci_spi_setup(struct spi_device *spi)
int retval = 0;
struct davinci_spi *dspi;
struct davinci_spi_platform_data *pdata;
+ struct spi_master *master = spi->master;
+ struct device_node *np = spi->dev.of_node;
+ bool internal_cs = true;
+ unsigned long flags = GPIOF_DIR_OUT;
dspi = spi_master_get_devdata(spi->master);
pdata = &dspi->pdata;
+ flags |= (spi->mode & SPI_CS_HIGH) ? GPIOF_INIT_LOW : GPIOF_INIT_HIGH;
+
if (!(spi->mode & SPI_NO_CS)) {
- if ((pdata->chip_sel == NULL) ||
- (pdata->chip_sel[spi->chip_select] == SPI_INTERN_CS))
- set_io_bits(dspi->base + SPIPC0, 1 << spi->chip_select);
+ if (np && (master->cs_gpios != NULL) && (spi->cs_gpio >= 0)) {
+ retval = gpio_request_one(spi->cs_gpio,
+ flags, dev_name(&spi->dev));
+ internal_cs = false;
+ } else if (pdata->chip_sel &&
+ spi->chip_select < pdata->num_chipselect &&
+ pdata->chip_sel[spi->chip_select] != SPI_INTERN_CS) {
+ spi->cs_gpio = pdata->chip_sel[spi->chip_select];
+ retval = gpio_request_one(spi->cs_gpio,
+ flags, dev_name(&spi->dev));
+ internal_cs = false;
+ }
+ }
+ if (retval) {
+ dev_err(&spi->dev, "GPIO %d setup failed (%d)\n",
+ spi->cs_gpio, retval);
+ return retval;
}
+ if (internal_cs)
+ set_io_bits(dspi->base + SPIPC0, 1 << spi->chip_select);
+
if (spi->mode & SPI_READY)
set_io_bits(dspi->base + SPIPC0, SPIPC0_SPIENA_MASK);
@@ -414,6 +439,12 @@ static int davinci_spi_setup(struct spi_device *spi)
return retval;
}
+static void davinci_spi_cleanup(struct spi_device *spi)
+{
+ if (spi->cs_gpio >= 0)
+ gpio_free(spi->cs_gpio);
+}
+
static int davinci_spi_check_error(struct davinci_spi *dspi, int int_status)
{
struct device *sdev = dspi->bitbang.master->dev.parent;
@@ -812,6 +843,8 @@ static int spi_davinci_get_pdata(struct platform_device *pdev,
/*
* default num_cs is 1 and all chipsel are internal to the chip
+ * indicated by chip_sel being NULL or cs_gpios being NULL or
+ * set to -ENOENT. num-cs includes internal as well as gpios.
* indicated by chip_sel being NULL. GPIO based CS is not
* supported yet in DT bindings.
*/
@@ -850,7 +883,7 @@ static int davinci_spi_probe(struct platform_device *pdev)
struct resource *r;
resource_size_t dma_rx_chan = SPI_NO_RESOURCE;
resource_size_t dma_tx_chan = SPI_NO_RESOURCE;
- int i = 0, ret = 0;
+ int ret = 0;
u32 spipc0;
master = spi_alloc_master(&pdev->dev, sizeof(struct davinci_spi));
@@ -876,6 +909,14 @@ static int davinci_spi_probe(struct platform_device *pdev)
/* pdata in dspi is now updated and point pdata to that */
pdata = &dspi->pdata;
+ dspi->bytes_per_word = devm_kzalloc(&pdev->dev,
+ sizeof(*dspi->bytes_per_word) *
+ pdata->num_chipselect, GFP_KERNEL);
+ if (dspi->bytes_per_word == NULL) {
+ ret = -ENOMEM;
+ goto free_master;
+ }
+
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (r == NULL) {
ret = -ENOENT;
@@ -915,6 +956,7 @@ static int davinci_spi_probe(struct platform_device *pdev)
master->num_chipselect = pdata->num_chipselect;
master->bits_per_word_mask = SPI_BPW_RANGE_MASK(2, 16);
master->setup = davinci_spi_setup;
+ master->cleanup = davinci_spi_cleanup;
dspi->bitbang.chipselect = davinci_spi_chipselect;
dspi->bitbang.setup_transfer = davinci_spi_setup_transfer;
@@ -962,14 +1004,6 @@ static int davinci_spi_probe(struct platform_device *pdev)
spipc0 = SPIPC0_DIFUN_MASK | SPIPC0_DOFUN_MASK | SPIPC0_CLKFUN_MASK;
iowrite32(spipc0, dspi->base + SPIPC0);
- /* initialize chip selects */
- if (pdata->chip_sel) {
- for (i = 0; i < pdata->num_chipselect; i++) {
- if (pdata->chip_sel[i] != SPI_INTERN_CS)
- gpio_direction_output(pdata->chip_sel[i], 1);
- }
- }
-
if (pdata->intr_line)
iowrite32(SPI_INTLVL_1, dspi->base + SPILVL);
else
diff --git a/drivers/spi/spi-dw-mmio.c b/drivers/spi/spi-dw-mmio.c
index a5cba14..21ce0e3 100644
--- a/drivers/spi/spi-dw-mmio.c
+++ b/drivers/spi/spi-dw-mmio.c
@@ -16,7 +16,9 @@
#include <linux/spi/spi.h>
#include <linux/scatterlist.h>
#include <linux/module.h>
+#include <linux/of.h>
#include <linux/of_gpio.h>
+#include <linux/of_platform.h>
#include "spi-dw.h"
@@ -33,6 +35,7 @@ static int dw_spi_mmio_probe(struct platform_device *pdev)
struct dw_spi *dws;
struct resource *mem;
int ret;
+ int num_cs;
dwsmmio = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_mmio),
GFP_KERNEL);
@@ -68,9 +71,16 @@ static int dw_spi_mmio_probe(struct platform_device *pdev)
return ret;
dws->bus_num = pdev->id;
- dws->num_cs = 4;
+
dws->max_freq = clk_get_rate(dwsmmio->clk);
+ num_cs = 4;
+
+ if (pdev->dev.of_node)
+ of_property_read_u32(pdev->dev.of_node, "num-cs", &num_cs);
+
+ dws->num_cs = num_cs;
+
if (pdev->dev.of_node) {
int i;
@@ -114,12 +124,19 @@ static int dw_spi_mmio_remove(struct platform_device *pdev)
return 0;
}
+static const struct of_device_id dw_spi_mmio_of_match[] = {
+ { .compatible = "snps,dw-apb-ssi", },
+ { /* end of table */}
+};
+MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match);
+
static struct platform_driver dw_spi_mmio_driver = {
.probe = dw_spi_mmio_probe,
.remove = dw_spi_mmio_remove,
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
+ .of_match_table = dw_spi_mmio_of_match,
},
};
module_platform_driver(dw_spi_mmio_driver);
diff --git a/drivers/spi/spi-efm32.c b/drivers/spi/spi-efm32.c
index be44a3e..6caeb1c 100644
--- a/drivers/spi/spi-efm32.c
+++ b/drivers/spi/spi-efm32.c
@@ -294,10 +294,16 @@ static void efm32_spi_probe_dt(struct platform_device *pdev,
u32 location;
int ret;
- ret = of_property_read_u32(np, "efm32,location", &location);
+ ret = of_property_read_u32(np, "energymicro,location", &location);
+
+ if (ret)
+ /* fall back to wrongly namespaced property */
+ ret = of_property_read_u32(np, "efm32,location", &location);
+
if (ret)
/* fall back to old and (wrongly) generic property "location" */
ret = of_property_read_u32(np, "location", &location);
+
if (!ret) {
dev_dbg(&pdev->dev, "using location %u\n", location);
} else {
diff --git a/drivers/spi/spi-falcon.c b/drivers/spi/spi-falcon.c
index ba441ad..f73b300 100644
--- a/drivers/spi/spi-falcon.c
+++ b/drivers/spi/spi-falcon.c
@@ -425,8 +425,6 @@ static int falcon_sflash_probe(struct platform_device *pdev)
master->unprepare_transfer_hardware = falcon_sflash_unprepare_xfer;
master->dev.of_node = pdev->dev.of_node;
- platform_set_drvdata(pdev, priv);
-
ret = devm_spi_register_master(&pdev->dev, master);
if (ret)
spi_master_put(master);
diff --git a/drivers/spi/spi-fsl-lib.c b/drivers/spi/spi-fsl-lib.c
index 95212ea..e0b773f 100644
--- a/drivers/spi/spi-fsl-lib.c
+++ b/drivers/spi/spi-fsl-lib.c
@@ -196,7 +196,7 @@ int of_mpc8xxx_spi_probe(struct platform_device *ofdev)
pinfo = devm_kzalloc(&ofdev->dev, sizeof(*pinfo), GFP_KERNEL);
if (!pinfo)
- return -ENOMEM;
+ return ret;
pdata = &pinfo->pdata;
dev->platform_data = pdata;
diff --git a/drivers/spi/spi-fsl-spi.c b/drivers/spi/spi-fsl-spi.c
index 98ccd23..9452f674 100644
--- a/drivers/spi/spi-fsl-spi.c
+++ b/drivers/spi/spi-fsl-spi.c
@@ -58,7 +58,7 @@ static struct fsl_spi_match_data of_fsl_spi_grlib_config = {
.type = TYPE_GRLIB,
};
-static struct of_device_id of_fsl_spi_match[] = {
+static const struct of_device_id of_fsl_spi_match[] = {
{
.compatible = "fsl,spi",
.data = &of_fsl_spi_fsl_config,
diff --git a/drivers/spi/spi-omap-100k.c b/drivers/spi/spi-omap-100k.c
index e7ffcde..5e91858 100644
--- a/drivers/spi/spi-omap-100k.c
+++ b/drivers/spi/spi-omap-100k.c
@@ -420,8 +420,6 @@ static int omap1_spi100k_probe(struct platform_device *pdev)
master->min_speed_hz = OMAP1_SPI100K_MAX_FREQ/(1<<16);
master->max_speed_hz = OMAP1_SPI100K_MAX_FREQ;
- platform_set_drvdata(pdev, master);
-
spi100k = spi_master_get_devdata(master);
/*
diff --git a/drivers/spi/spi-omap-uwire.c b/drivers/spi/spi-omap-uwire.c
index 0f5a0aa..8bca90a 100644
--- a/drivers/spi/spi-omap-uwire.c
+++ b/drivers/spi/spi-omap-uwire.c
@@ -41,14 +41,15 @@
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/slab.h>
+#include <linux/device.h>
#include <linux/spi/spi.h>
#include <linux/spi/spi_bitbang.h>
#include <linux/module.h>
+#include <linux/io.h>
#include <asm/irq.h>
#include <mach/hardware.h>
-#include <asm/io.h>
#include <asm/mach-types.h>
#include <mach/mux.h>
@@ -447,7 +448,6 @@ static void uwire_off(struct uwire_spi *uwire)
{
uwire_write_reg(UWIRE_SR3, 0);
clk_disable(uwire->ck);
- clk_put(uwire->ck);
spi_master_put(uwire->bitbang.master);
}
@@ -463,7 +463,7 @@ static int uwire_probe(struct platform_device *pdev)
uwire = spi_master_get_devdata(master);
- uwire_base = ioremap(UWIRE_BASE_PHYS, UWIRE_IO_SIZE);
+ uwire_base = devm_ioremap(&pdev->dev, UWIRE_BASE_PHYS, UWIRE_IO_SIZE);
if (!uwire_base) {
dev_dbg(&pdev->dev, "can't ioremap UWIRE\n");
spi_master_put(master);
@@ -472,12 +472,11 @@ static int uwire_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, uwire);
- uwire->ck = clk_get(&pdev->dev, "fck");
+ uwire->ck = devm_clk_get(&pdev->dev, "fck");
if (IS_ERR(uwire->ck)) {
status = PTR_ERR(uwire->ck);
dev_dbg(&pdev->dev, "no functional clock?\n");
spi_master_put(master);
- iounmap(uwire_base);
return status;
}
clk_enable(uwire->ck);
@@ -507,7 +506,6 @@ static int uwire_probe(struct platform_device *pdev)
status = spi_bitbang_start(&uwire->bitbang);
if (status < 0) {
uwire_off(uwire);
- iounmap(uwire_base);
}
return status;
}
@@ -520,7 +518,6 @@ static int uwire_remove(struct platform_device *pdev)
spi_bitbang_stop(&uwire->bitbang);
uwire_off(uwire);
- iounmap(uwire_base);
return 0;
}
diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c
index 4dc77df..68441fa 100644
--- a/drivers/spi/spi-omap2-mcspi.c
+++ b/drivers/spi/spi-omap2-mcspi.c
@@ -149,6 +149,7 @@ struct omap2_mcspi_cs {
void __iomem *base;
unsigned long phys;
int word_len;
+ u16 mode;
struct list_head node;
/* Context save and restore shadow register */
u32 chconf0, chctrl0;
@@ -926,6 +927,8 @@ static int omap2_mcspi_setup_transfer(struct spi_device *spi,
mcspi_write_chconf0(spi, l);
+ cs->mode = spi->mode;
+
dev_dbg(&spi->dev, "setup: speed %d, sample %s edge, clk %s\n",
speed_hz,
(spi->mode & SPI_CPHA) ? "trailing" : "leading",
@@ -998,6 +1001,7 @@ static int omap2_mcspi_setup(struct spi_device *spi)
return -ENOMEM;
cs->base = mcspi->base + spi->chip_select * 0x14;
cs->phys = mcspi->phys + spi->chip_select * 0x14;
+ cs->mode = 0;
cs->chconf0 = 0;
cs->chctrl0 = 0;
spi->controller_state = cs;
@@ -1079,6 +1083,16 @@ static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m)
cs = spi->controller_state;
cd = spi->controller_data;
+ /*
+ * The slave driver could have changed spi->mode in which case
+ * it will be different from cs->mode (the current hardware setup).
+ * If so, set par_override (even though its not a parity issue) so
+ * omap2_mcspi_setup_transfer will be called to configure the hardware
+ * with the correct mode on the first iteration of the loop below.
+ */
+ if (spi->mode != cs->mode)
+ par_override = 1;
+
omap2_mcspi_set_enable(spi, 0);
list_for_each_entry(t, &m->transfers, transfer_list) {
if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) {
diff --git a/drivers/spi/spi-orion.c b/drivers/spi/spi-orion.c
index d018a4a..c4675fa 100644
--- a/drivers/spi/spi-orion.c
+++ b/drivers/spi/spi-orion.c
@@ -16,6 +16,7 @@
#include <linux/io.h>
#include <linux/spi/spi.h>
#include <linux/module.h>
+#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/clk.h>
#include <linux/sizes.h>
@@ -23,6 +24,9 @@
#define DRIVER_NAME "orion_spi"
+/* Runtime PM autosuspend timeout: PM is fairly light on this driver */
+#define SPI_AUTOSUSPEND_TIMEOUT 200
+
#define ORION_NUM_CHIPSELECTS 1 /* only one slave is supported*/
#define ORION_SPI_WAIT_RDY_MAX_LOOP 2000 /* in usec */
@@ -277,7 +281,6 @@ out:
return xfer->len - count;
}
-
static int orion_spi_transfer_one_message(struct spi_master *master,
struct spi_message *m)
{
@@ -346,8 +349,6 @@ static int orion_spi_probe(struct platform_device *pdev)
struct resource *r;
unsigned long tclk_hz;
int status = 0;
- const u32 *iprop;
- int size;
master = spi_alloc_master(&pdev->dev, sizeof(*spi));
if (master == NULL) {
@@ -358,10 +359,10 @@ static int orion_spi_probe(struct platform_device *pdev)
if (pdev->id != -1)
master->bus_num = pdev->id;
if (pdev->dev.of_node) {
- iprop = of_get_property(pdev->dev.of_node, "cell-index",
- &size);
- if (iprop && size == sizeof(*iprop))
- master->bus_num = *iprop;
+ u32 cell_index;
+ if (!of_property_read_u32(pdev->dev.of_node, "cell-index",
+ &cell_index))
+ master->bus_num = cell_index;
}
/* we support only mode 0, and no options */
@@ -370,6 +371,7 @@ static int orion_spi_probe(struct platform_device *pdev)
master->transfer_one_message = orion_spi_transfer_one_message;
master->num_chipselect = ORION_NUM_CHIPSELECTS;
master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16);
+ master->auto_runtime_pm = true;
platform_set_drvdata(pdev, master);
@@ -382,8 +384,10 @@ static int orion_spi_probe(struct platform_device *pdev)
goto out;
}
- clk_prepare(spi->clk);
- clk_enable(spi->clk);
+ status = clk_prepare_enable(spi->clk);
+ if (status)
+ goto out;
+
tclk_hz = clk_get_rate(spi->clk);
master->max_speed_hz = DIV_ROUND_UP(tclk_hz, 4);
master->min_speed_hz = DIV_ROUND_UP(tclk_hz, 30);
@@ -395,16 +399,27 @@ static int orion_spi_probe(struct platform_device *pdev)
goto out_rel_clk;
}
- if (orion_spi_reset(spi) < 0)
- goto out_rel_clk;
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_use_autosuspend(&pdev->dev);
+ pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT);
+ pm_runtime_enable(&pdev->dev);
+
+ status = orion_spi_reset(spi);
+ if (status < 0)
+ goto out_rel_pm;
+
+ pm_runtime_mark_last_busy(&pdev->dev);
+ pm_runtime_put_autosuspend(&pdev->dev);
master->dev.of_node = pdev->dev.of_node;
- status = devm_spi_register_master(&pdev->dev, master);
+ status = spi_register_master(master);
if (status < 0)
- goto out_rel_clk;
+ goto out_rel_pm;
return status;
+out_rel_pm:
+ pm_runtime_disable(&pdev->dev);
out_rel_clk:
clk_disable_unprepare(spi->clk);
out:
@@ -415,19 +430,45 @@ out:
static int orion_spi_remove(struct platform_device *pdev)
{
- struct spi_master *master;
- struct orion_spi *spi;
-
- master = platform_get_drvdata(pdev);
- spi = spi_master_get_devdata(master);
+ struct spi_master *master = platform_get_drvdata(pdev);
+ struct orion_spi *spi = spi_master_get_devdata(master);
+ pm_runtime_get_sync(&pdev->dev);
clk_disable_unprepare(spi->clk);
+ spi_unregister_master(master);
+ pm_runtime_disable(&pdev->dev);
+
return 0;
}
MODULE_ALIAS("platform:" DRIVER_NAME);
+#ifdef CONFIG_PM_RUNTIME
+static int orion_spi_runtime_suspend(struct device *dev)
+{
+ struct spi_master *master = dev_get_drvdata(dev);
+ struct orion_spi *spi = spi_master_get_devdata(master);
+
+ clk_disable_unprepare(spi->clk);
+ return 0;
+}
+
+static int orion_spi_runtime_resume(struct device *dev)
+{
+ struct spi_master *master = dev_get_drvdata(dev);
+ struct orion_spi *spi = spi_master_get_devdata(master);
+
+ return clk_prepare_enable(spi->clk);
+}
+#endif
+
+static const struct dev_pm_ops orion_spi_pm_ops = {
+ SET_RUNTIME_PM_OPS(orion_spi_runtime_suspend,
+ orion_spi_runtime_resume,
+ NULL)
+};
+
static const struct of_device_id orion_spi_of_match_table[] = {
{ .compatible = "marvell,orion-spi", },
{}
@@ -438,6 +479,7 @@ static struct platform_driver orion_spi_driver = {
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
+ .pm = &orion_spi_pm_ops,
.of_match_table = of_match_ptr(orion_spi_of_match_table),
},
.probe = orion_spi_probe,
diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
index 66d2ae2..1189cfd 100644
--- a/drivers/spi/spi-pl022.c
+++ b/drivers/spi/spi-pl022.c
@@ -1417,7 +1417,7 @@ static void do_interrupt_dma_transfer(struct pl022 *pl022)
* Default is to enable all interrupts except RX -
* this will be enabled once TX is complete
*/
- u32 irqflags = ENABLE_ALL_INTERRUPTS & ~SSP_IMSC_MASK_RXIM;
+ u32 irqflags = (u32)(ENABLE_ALL_INTERRUPTS & ~SSP_IMSC_MASK_RXIM);
/* Enable target chip, if not already active */
if (!pl022->next_msg_cs_active)
diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
index c08da38..9f83d29 100644
--- a/drivers/spi/spi-qup.c
+++ b/drivers/spi/spi-qup.c
@@ -142,6 +142,7 @@ struct spi_qup {
int w_size; /* bytes per SPI word */
int tx_bytes;
int rx_bytes;
+ int qup_v1;
};
@@ -420,7 +421,9 @@ static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer)
config |= QUP_CONFIG_SPI_MODE;
writel_relaxed(config, controller->base + QUP_CONFIG);
- writel_relaxed(0, controller->base + QUP_OPERATIONAL_MASK);
+ /* only write to OPERATIONAL_MASK when register is present */
+ if (!controller->qup_v1)
+ writel_relaxed(0, controller->base + QUP_OPERATIONAL_MASK);
return 0;
}
@@ -486,7 +489,7 @@ static int spi_qup_probe(struct platform_device *pdev)
struct resource *res;
struct device *dev;
void __iomem *base;
- u32 data, max_freq, iomode;
+ u32 max_freq, iomode;
int ret, irq, size;
dev = &pdev->dev;
@@ -529,15 +532,6 @@ static int spi_qup_probe(struct platform_device *pdev)
return ret;
}
- data = readl_relaxed(base + QUP_HW_VERSION);
-
- if (data < QUP_HW_VERSION_2_1_1) {
- clk_disable_unprepare(cclk);
- clk_disable_unprepare(iclk);
- dev_err(dev, "v.%08x is not supported\n", data);
- return -ENXIO;
- }
-
master = spi_alloc_master(dev, sizeof(struct spi_qup));
if (!master) {
clk_disable_unprepare(cclk);
@@ -570,6 +564,10 @@ static int spi_qup_probe(struct platform_device *pdev)
controller->cclk = cclk;
controller->irq = irq;
+ /* set v1 flag if device is version 1 */
+ if (of_device_is_compatible(dev->of_node, "qcom,spi-qup-v1.1.1"))
+ controller->qup_v1 = 1;
+
spin_lock_init(&controller->lock);
init_completion(&controller->done);
@@ -593,8 +591,8 @@ static int spi_qup_probe(struct platform_device *pdev)
size = QUP_IO_M_INPUT_FIFO_SIZE(iomode);
controller->in_fifo_sz = controller->in_blk_sz * (2 << size);
- dev_info(dev, "v.%08x IN:block:%d, fifo:%d, OUT:block:%d, fifo:%d\n",
- data, controller->in_blk_sz, controller->in_fifo_sz,
+ dev_info(dev, "IN:block:%d, fifo:%d, OUT:block:%d, fifo:%d\n",
+ controller->in_blk_sz, controller->in_fifo_sz,
controller->out_blk_sz, controller->out_fifo_sz);
writel_relaxed(1, base + QUP_SW_RESET);
@@ -607,10 +605,19 @@ static int spi_qup_probe(struct platform_device *pdev)
writel_relaxed(0, base + QUP_OPERATIONAL);
writel_relaxed(0, base + QUP_IO_M_MODES);
- writel_relaxed(0, base + QUP_OPERATIONAL_MASK);
+
+ if (!controller->qup_v1)
+ writel_relaxed(0, base + QUP_OPERATIONAL_MASK);
+
writel_relaxed(SPI_ERROR_CLK_UNDER_RUN | SPI_ERROR_CLK_OVER_RUN,
base + SPI_ERROR_FLAGS_EN);
+ /* if earlier version of the QUP, disable INPUT_OVERRUN */
+ if (controller->qup_v1)
+ writel_relaxed(QUP_ERROR_OUTPUT_OVER_RUN |
+ QUP_ERROR_INPUT_UNDER_RUN | QUP_ERROR_OUTPUT_UNDER_RUN,
+ base + QUP_ERROR_FLAGS_EN);
+
writel_relaxed(0, base + SPI_CONFIG);
writel_relaxed(SPI_IO_C_NO_TRI_STATE, base + SPI_IO_CONTROL);
@@ -732,6 +739,7 @@ static int spi_qup_remove(struct platform_device *pdev)
}
static const struct of_device_id spi_qup_dt_match[] = {
+ { .compatible = "qcom,spi-qup-v1.1.1", },
{ .compatible = "qcom,spi-qup-v2.1.1", },
{ .compatible = "qcom,spi-qup-v2.2.1", },
{ }
diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
new file mode 100644
index 0000000..c074360
--- /dev/null
+++ b/drivers/spi/spi-rockchip.c
@@ -0,0 +1,837 @@
+/*
+ * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
+ * Author: Addy Ke <addy.ke@rock-chips.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/spi/spi.h>
+#include <linux/scatterlist.h>
+#include <linux/of.h>
+#include <linux/pm_runtime.h>
+#include <linux/io.h>
+#include <linux/dmaengine.h>
+
+#define DRIVER_NAME "rockchip-spi"
+
+/* SPI register offsets */
+#define ROCKCHIP_SPI_CTRLR0 0x0000
+#define ROCKCHIP_SPI_CTRLR1 0x0004
+#define ROCKCHIP_SPI_SSIENR 0x0008
+#define ROCKCHIP_SPI_SER 0x000c
+#define ROCKCHIP_SPI_BAUDR 0x0010
+#define ROCKCHIP_SPI_TXFTLR 0x0014
+#define ROCKCHIP_SPI_RXFTLR 0x0018
+#define ROCKCHIP_SPI_TXFLR 0x001c
+#define ROCKCHIP_SPI_RXFLR 0x0020
+#define ROCKCHIP_SPI_SR 0x0024
+#define ROCKCHIP_SPI_IPR 0x0028
+#define ROCKCHIP_SPI_IMR 0x002c
+#define ROCKCHIP_SPI_ISR 0x0030
+#define ROCKCHIP_SPI_RISR 0x0034
+#define ROCKCHIP_SPI_ICR 0x0038
+#define ROCKCHIP_SPI_DMACR 0x003c
+#define ROCKCHIP_SPI_DMATDLR 0x0040
+#define ROCKCHIP_SPI_DMARDLR 0x0044
+#define ROCKCHIP_SPI_TXDR 0x0400
+#define ROCKCHIP_SPI_RXDR 0x0800
+
+/* Bit fields in CTRLR0 */
+#define CR0_DFS_OFFSET 0
+
+#define CR0_CFS_OFFSET 2
+
+#define CR0_SCPH_OFFSET 6
+
+#define CR0_SCPOL_OFFSET 7
+
+#define CR0_CSM_OFFSET 8
+#define CR0_CSM_KEEP 0x0
+/* ss_n be high for half sclk_out cycles */
+#define CR0_CSM_HALF 0X1
+/* ss_n be high for one sclk_out cycle */
+#define CR0_CSM_ONE 0x2
+
+/* ss_n to sclk_out delay */
+#define CR0_SSD_OFFSET 10
+/*
+ * The period between ss_n active and
+ * sclk_out active is half sclk_out cycles
+ */
+#define CR0_SSD_HALF 0x0
+/*
+ * The period between ss_n active and
+ * sclk_out active is one sclk_out cycle
+ */
+#define CR0_SSD_ONE 0x1
+
+#define CR0_EM_OFFSET 11
+#define CR0_EM_LITTLE 0x0
+#define CR0_EM_BIG 0x1
+
+#define CR0_FBM_OFFSET 12
+#define CR0_FBM_MSB 0x0
+#define CR0_FBM_LSB 0x1
+
+#define CR0_BHT_OFFSET 13
+#define CR0_BHT_16BIT 0x0
+#define CR0_BHT_8BIT 0x1
+
+#define CR0_RSD_OFFSET 14
+
+#define CR0_FRF_OFFSET 16
+#define CR0_FRF_SPI 0x0
+#define CR0_FRF_SSP 0x1
+#define CR0_FRF_MICROWIRE 0x2
+
+#define CR0_XFM_OFFSET 18
+#define CR0_XFM_MASK (0x03 << SPI_XFM_OFFSET)
+#define CR0_XFM_TR 0x0
+#define CR0_XFM_TO 0x1
+#define CR0_XFM_RO 0x2
+
+#define CR0_OPM_OFFSET 20
+#define CR0_OPM_MASTER 0x0
+#define CR0_OPM_SLAVE 0x1
+
+#define CR0_MTM_OFFSET 0x21
+
+/* Bit fields in SER, 2bit */
+#define SER_MASK 0x3
+
+/* Bit fields in SR, 5bit */
+#define SR_MASK 0x1f
+#define SR_BUSY (1 << 0)
+#define SR_TF_FULL (1 << 1)
+#define SR_TF_EMPTY (1 << 2)
+#define SR_RF_EMPTY (1 << 3)
+#define SR_RF_FULL (1 << 4)
+
+/* Bit fields in ISR, IMR, ISR, RISR, 5bit */
+#define INT_MASK 0x1f
+#define INT_TF_EMPTY (1 << 0)
+#define INT_TF_OVERFLOW (1 << 1)
+#define INT_RF_UNDERFLOW (1 << 2)
+#define INT_RF_OVERFLOW (1 << 3)
+#define INT_RF_FULL (1 << 4)
+
+/* Bit fields in ICR, 4bit */
+#define ICR_MASK 0x0f
+#define ICR_ALL (1 << 0)
+#define ICR_RF_UNDERFLOW (1 << 1)
+#define ICR_RF_OVERFLOW (1 << 2)
+#define ICR_TF_OVERFLOW (1 << 3)
+
+/* Bit fields in DMACR */
+#define RF_DMA_EN (1 << 0)
+#define TF_DMA_EN (1 << 1)
+
+#define RXBUSY (1 << 0)
+#define TXBUSY (1 << 1)
+
+enum rockchip_ssi_type {
+ SSI_MOTO_SPI = 0,
+ SSI_TI_SSP,
+ SSI_NS_MICROWIRE,
+};
+
+struct rockchip_spi_dma_data {
+ struct dma_chan *ch;
+ enum dma_transfer_direction direction;
+ dma_addr_t addr;
+};
+
+struct rockchip_spi {
+ struct device *dev;
+ struct spi_master *master;
+
+ struct clk *spiclk;
+ struct clk *apb_pclk;
+
+ void __iomem *regs;
+ /*depth of the FIFO buffer */
+ u32 fifo_len;
+ /* max bus freq supported */
+ u32 max_freq;
+ /* supported slave numbers */
+ enum rockchip_ssi_type type;
+
+ u16 mode;
+ u8 tmode;
+ u8 bpw;
+ u8 n_bytes;
+ unsigned len;
+ u32 speed;
+
+ const void *tx;
+ const void *tx_end;
+ void *rx;
+ void *rx_end;
+
+ u32 state;
+ /* protect state */
+ spinlock_t lock;
+
+ struct completion xfer_completion;
+
+ u32 use_dma;
+ struct sg_table tx_sg;
+ struct sg_table rx_sg;
+ struct rockchip_spi_dma_data dma_rx;
+ struct rockchip_spi_dma_data dma_tx;
+};
+
+static inline void spi_enable_chip(struct rockchip_spi *rs, int enable)
+{
+ writel_relaxed((enable ? 1 : 0), rs->regs + ROCKCHIP_SPI_SSIENR);
+}
+
+static inline void spi_set_clk(struct rockchip_spi *rs, u16 div)
+{
+ writel_relaxed(div, rs->regs + ROCKCHIP_SPI_BAUDR);
+}
+
+static inline void flush_fifo(struct rockchip_spi *rs)
+{
+ while (readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR))
+ readl_relaxed(rs->regs + ROCKCHIP_SPI_RXDR);
+}
+
+static inline void wait_for_idle(struct rockchip_spi *rs)
+{
+ unsigned long timeout = jiffies + msecs_to_jiffies(5);
+
+ do {
+ if (!(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY))
+ return;
+ } while (time_before(jiffies, timeout));
+
+ dev_warn(rs->dev, "spi controller is in busy state!\n");
+}
+
+static u32 get_fifo_len(struct rockchip_spi *rs)
+{
+ u32 fifo;
+
+ for (fifo = 2; fifo < 32; fifo++) {
+ writel_relaxed(fifo, rs->regs + ROCKCHIP_SPI_TXFTLR);
+ if (fifo != readl_relaxed(rs->regs + ROCKCHIP_SPI_TXFTLR))
+ break;
+ }
+
+ writel_relaxed(0, rs->regs + ROCKCHIP_SPI_TXFTLR);
+
+ return (fifo == 31) ? 0 : fifo;
+}
+
+static inline u32 tx_max(struct rockchip_spi *rs)
+{
+ u32 tx_left, tx_room;
+
+ tx_left = (rs->tx_end - rs->tx) / rs->n_bytes;
+ tx_room = rs->fifo_len - readl_relaxed(rs->regs + ROCKCHIP_SPI_TXFLR);
+
+ return min(tx_left, tx_room);
+}
+
+static inline u32 rx_max(struct rockchip_spi *rs)
+{
+ u32 rx_left = (rs->rx_end - rs->rx) / rs->n_bytes;
+ u32 rx_room = (u32)readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR);
+
+ return min(rx_left, rx_room);
+}
+
+static void rockchip_spi_set_cs(struct spi_device *spi, bool enable)
+{
+ u32 ser;
+ struct rockchip_spi *rs = spi_master_get_devdata(spi->master);
+
+ ser = readl_relaxed(rs->regs + ROCKCHIP_SPI_SER) & SER_MASK;
+
+ /*
+ * drivers/spi/spi.c:
+ * static void spi_set_cs(struct spi_device *spi, bool enable)
+ * {
+ * if (spi->mode & SPI_CS_HIGH)
+ * enable = !enable;
+ *
+ * if (spi->cs_gpio >= 0)
+ * gpio_set_value(spi->cs_gpio, !enable);
+ * else if (spi->master->set_cs)
+ * spi->master->set_cs(spi, !enable);
+ * }
+ *
+ * Note: enable(rockchip_spi_set_cs) = !enable(spi_set_cs)
+ */
+ if (!enable)
+ ser |= 1 << spi->chip_select;
+ else
+ ser &= ~(1 << spi->chip_select);
+
+ writel_relaxed(ser, rs->regs + ROCKCHIP_SPI_SER);
+}
+
+static int rockchip_spi_prepare_message(struct spi_master *master,
+ struct spi_message *msg)
+{
+ struct rockchip_spi *rs = spi_master_get_devdata(master);
+ struct spi_device *spi = msg->spi;
+
+ rs->mode = spi->mode;
+
+ return 0;
+}
+
+static int rockchip_spi_unprepare_message(struct spi_master *master,
+ struct spi_message *msg)
+{
+ unsigned long flags;
+ struct rockchip_spi *rs = spi_master_get_devdata(master);
+
+ spin_lock_irqsave(&rs->lock, flags);
+
+ /*
+ * For DMA mode, we need terminate DMA channel and flush
+ * fifo for the next transfer if DMA thansfer timeout.
+ * unprepare_message() was called by core if transfer complete
+ * or timeout. Maybe it is reasonable for error handling here.
+ */
+ if (rs->use_dma) {
+ if (rs->state & RXBUSY) {
+ dmaengine_terminate_all(rs->dma_rx.ch);
+ flush_fifo(rs);
+ }
+
+ if (rs->state & TXBUSY)
+ dmaengine_terminate_all(rs->dma_tx.ch);
+ }
+
+ spin_unlock_irqrestore(&rs->lock, flags);
+
+ return 0;
+}
+
+static void rockchip_spi_pio_writer(struct rockchip_spi *rs)
+{
+ u32 max = tx_max(rs);
+ u32 txw = 0;
+
+ while (max--) {
+ if (rs->n_bytes == 1)
+ txw = *(u8 *)(rs->tx);
+ else
+ txw = *(u16 *)(rs->tx);
+
+ writel_relaxed(txw, rs->regs + ROCKCHIP_SPI_TXDR);
+ rs->tx += rs->n_bytes;
+ }
+}
+
+static void rockchip_spi_pio_reader(struct rockchip_spi *rs)
+{
+ u32 max = rx_max(rs);
+ u32 rxw;
+
+ while (max--) {
+ rxw = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXDR);
+ if (rs->n_bytes == 1)
+ *(u8 *)(rs->rx) = (u8)rxw;
+ else
+ *(u16 *)(rs->rx) = (u16)rxw;
+ rs->rx += rs->n_bytes;
+ }
+}
+
+static int rockchip_spi_pio_transfer(struct rockchip_spi *rs)
+{
+ int remain = 0;
+
+ do {
+ if (rs->tx) {
+ remain = rs->tx_end - rs->tx;
+ rockchip_spi_pio_writer(rs);
+ }
+
+ if (rs->rx) {
+ remain = rs->rx_end - rs->rx;
+ rockchip_spi_pio_reader(rs);
+ }
+
+ cpu_relax();
+ } while (remain);
+
+ /* If tx, wait until the FIFO data completely. */
+ if (rs->tx)
+ wait_for_idle(rs);
+
+ return 0;
+}
+
+static void rockchip_spi_dma_rxcb(void *data)
+{
+ unsigned long flags;
+ struct rockchip_spi *rs = data;
+
+ spin_lock_irqsave(&rs->lock, flags);
+
+ rs->state &= ~RXBUSY;
+ if (!(rs->state & TXBUSY))
+ spi_finalize_current_transfer(rs->master);
+
+ spin_unlock_irqrestore(&rs->lock, flags);
+}
+
+static void rockchip_spi_dma_txcb(void *data)
+{
+ unsigned long flags;
+ struct rockchip_spi *rs = data;
+
+ /* Wait until the FIFO data completely. */
+ wait_for_idle(rs);
+
+ spin_lock_irqsave(&rs->lock, flags);
+
+ rs->state &= ~TXBUSY;
+ if (!(rs->state & RXBUSY))
+ spi_finalize_current_transfer(rs->master);
+
+ spin_unlock_irqrestore(&rs->lock, flags);
+}
+
+static int rockchip_spi_dma_transfer(struct rockchip_spi *rs)
+{
+ unsigned long flags;
+ struct dma_slave_config rxconf, txconf;
+ struct dma_async_tx_descriptor *rxdesc, *txdesc;
+
+ spin_lock_irqsave(&rs->lock, flags);
+ rs->state &= ~RXBUSY;
+ rs->state &= ~TXBUSY;
+ spin_unlock_irqrestore(&rs->lock, flags);
+
+ if (rs->rx) {
+ rxconf.direction = rs->dma_rx.direction;
+ rxconf.src_addr = rs->dma_rx.addr;
+ rxconf.src_addr_width = rs->n_bytes;
+ rxconf.src_maxburst = rs->n_bytes;
+ dmaengine_slave_config(rs->dma_rx.ch, &rxconf);
+
+ rxdesc = dmaengine_prep_slave_sg(
+ rs->dma_rx.ch,
+ rs->rx_sg.sgl, rs->rx_sg.nents,
+ rs->dma_rx.direction, DMA_PREP_INTERRUPT);
+
+ rxdesc->callback = rockchip_spi_dma_rxcb;
+ rxdesc->callback_param = rs;
+ }
+
+ if (rs->tx) {
+ txconf.direction = rs->dma_tx.direction;
+ txconf.dst_addr = rs->dma_tx.addr;
+ txconf.dst_addr_width = rs->n_bytes;
+ txconf.dst_maxburst = rs->n_bytes;
+ dmaengine_slave_config(rs->dma_tx.ch, &txconf);
+
+ txdesc = dmaengine_prep_slave_sg(
+ rs->dma_tx.ch,
+ rs->tx_sg.sgl, rs->tx_sg.nents,
+ rs->dma_tx.direction, DMA_PREP_INTERRUPT);
+
+ txdesc->callback = rockchip_spi_dma_txcb;
+ txdesc->callback_param = rs;
+ }
+
+ /* rx must be started before tx due to spi instinct */
+ if (rs->rx) {
+ spin_lock_irqsave(&rs->lock, flags);
+ rs->state |= RXBUSY;
+ spin_unlock_irqrestore(&rs->lock, flags);
+ dmaengine_submit(rxdesc);
+ dma_async_issue_pending(rs->dma_rx.ch);
+ }
+
+ if (rs->tx) {
+ spin_lock_irqsave(&rs->lock, flags);
+ rs->state |= TXBUSY;
+ spin_unlock_irqrestore(&rs->lock, flags);
+ dmaengine_submit(txdesc);
+ dma_async_issue_pending(rs->dma_tx.ch);
+ }
+
+ return 1;
+}
+
+static void rockchip_spi_config(struct rockchip_spi *rs)
+{
+ u32 div = 0;
+ u32 dmacr = 0;
+
+ u32 cr0 = (CR0_BHT_8BIT << CR0_BHT_OFFSET)
+ | (CR0_SSD_ONE << CR0_SSD_OFFSET);
+
+ cr0 |= (rs->n_bytes << CR0_DFS_OFFSET);
+ cr0 |= ((rs->mode & 0x3) << CR0_SCPH_OFFSET);
+ cr0 |= (rs->tmode << CR0_XFM_OFFSET);
+ cr0 |= (rs->type << CR0_FRF_OFFSET);
+
+ if (rs->use_dma) {
+ if (rs->tx)
+ dmacr |= TF_DMA_EN;
+ if (rs->rx)
+ dmacr |= RF_DMA_EN;
+ }
+
+ /* div doesn't support odd number */
+ div = rs->max_freq / rs->speed;
+ div = (div + 1) & 0xfffe;
+
+ spi_enable_chip(rs, 0);
+
+ writel_relaxed(cr0, rs->regs + ROCKCHIP_SPI_CTRLR0);
+
+ writel_relaxed(rs->len - 1, rs->regs + ROCKCHIP_SPI_CTRLR1);
+ writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_TXFTLR);
+ writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_RXFTLR);
+
+ writel_relaxed(0, rs->regs + ROCKCHIP_SPI_DMATDLR);
+ writel_relaxed(0, rs->regs + ROCKCHIP_SPI_DMARDLR);
+ writel_relaxed(dmacr, rs->regs + ROCKCHIP_SPI_DMACR);
+
+ spi_set_clk(rs, div);
+
+ dev_dbg(rs->dev, "cr0 0x%x, div %d\n", cr0, div);
+
+ spi_enable_chip(rs, 1);
+}
+
+static int rockchip_spi_transfer_one(
+ struct spi_master *master,
+ struct spi_device *spi,
+ struct spi_transfer *xfer)
+{
+ int ret = 0;
+ struct rockchip_spi *rs = spi_master_get_devdata(master);
+
+ WARN_ON((readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY));
+
+ if (!xfer->tx_buf && !xfer->rx_buf) {
+ dev_err(rs->dev, "No buffer for transfer\n");
+ return -EINVAL;
+ }
+
+ rs->speed = xfer->speed_hz;
+ rs->bpw = xfer->bits_per_word;
+ rs->n_bytes = rs->bpw >> 3;
+
+ rs->tx = xfer->tx_buf;
+ rs->tx_end = rs->tx + xfer->len;
+ rs->rx = xfer->rx_buf;
+ rs->rx_end = rs->rx + xfer->len;
+ rs->len = xfer->len;
+
+ rs->tx_sg = xfer->tx_sg;
+ rs->rx_sg = xfer->rx_sg;
+
+ if (rs->tx && rs->rx)
+ rs->tmode = CR0_XFM_TR;
+ else if (rs->tx)
+ rs->tmode = CR0_XFM_TO;
+ else if (rs->rx)
+ rs->tmode = CR0_XFM_RO;
+
+ if (master->can_dma && master->can_dma(master, spi, xfer))
+ rs->use_dma = 1;
+ else
+ rs->use_dma = 0;
+
+ rockchip_spi_config(rs);
+
+ if (rs->use_dma)
+ ret = rockchip_spi_dma_transfer(rs);
+ else
+ ret = rockchip_spi_pio_transfer(rs);
+
+ return ret;
+}
+
+static bool rockchip_spi_can_dma(struct spi_master *master,
+ struct spi_device *spi,
+ struct spi_transfer *xfer)
+{
+ struct rockchip_spi *rs = spi_master_get_devdata(master);
+
+ return (xfer->len > rs->fifo_len);
+}
+
+static int rockchip_spi_probe(struct platform_device *pdev)
+{
+ int ret = 0;
+ struct rockchip_spi *rs;
+ struct spi_master *master;
+ struct resource *mem;
+
+ master = spi_alloc_master(&pdev->dev, sizeof(struct rockchip_spi));
+ if (!master)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, master);
+
+ rs = spi_master_get_devdata(master);
+ memset(rs, 0, sizeof(struct rockchip_spi));
+
+ /* Get basic io resource and map it */
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ rs->regs = devm_ioremap_resource(&pdev->dev, mem);
+ if (IS_ERR(rs->regs)) {
+ ret = PTR_ERR(rs->regs);
+ goto err_ioremap_resource;
+ }
+
+ rs->apb_pclk = devm_clk_get(&pdev->dev, "apb_pclk");
+ if (IS_ERR(rs->apb_pclk)) {
+ dev_err(&pdev->dev, "Failed to get apb_pclk\n");
+ ret = PTR_ERR(rs->apb_pclk);
+ goto err_ioremap_resource;
+ }
+
+ rs->spiclk = devm_clk_get(&pdev->dev, "spiclk");
+ if (IS_ERR(rs->spiclk)) {
+ dev_err(&pdev->dev, "Failed to get spi_pclk\n");
+ ret = PTR_ERR(rs->spiclk);
+ goto err_ioremap_resource;
+ }
+
+ ret = clk_prepare_enable(rs->apb_pclk);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to enable apb_pclk\n");
+ goto err_ioremap_resource;
+ }
+
+ ret = clk_prepare_enable(rs->spiclk);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to enable spi_clk\n");
+ goto err_spiclk_enable;
+ }
+
+ spi_enable_chip(rs, 0);
+
+ rs->type = SSI_MOTO_SPI;
+ rs->master = master;
+ rs->dev = &pdev->dev;
+ rs->max_freq = clk_get_rate(rs->spiclk);
+
+ rs->fifo_len = get_fifo_len(rs);
+ if (!rs->fifo_len) {
+ dev_err(&pdev->dev, "Failed to get fifo length\n");
+ ret = -EINVAL;
+ goto err_get_fifo_len;
+ }
+
+ spin_lock_init(&rs->lock);
+
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+
+ master->auto_runtime_pm = true;
+ master->bus_num = pdev->id;
+ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP;
+ master->num_chipselect = 2;
+ master->dev.of_node = pdev->dev.of_node;
+ master->bits_per_word_mask = SPI_BPW_MASK(16) | SPI_BPW_MASK(8);
+
+ master->set_cs = rockchip_spi_set_cs;
+ master->prepare_message = rockchip_spi_prepare_message;
+ master->unprepare_message = rockchip_spi_unprepare_message;
+ master->transfer_one = rockchip_spi_transfer_one;
+
+ rs->dma_tx.ch = dma_request_slave_channel(rs->dev, "tx");
+ if (!rs->dma_tx.ch)
+ dev_warn(rs->dev, "Failed to request TX DMA channel\n");
+
+ rs->dma_rx.ch = dma_request_slave_channel(rs->dev, "rx");
+ if (!rs->dma_rx.ch) {
+ if (rs->dma_tx.ch) {
+ dma_release_channel(rs->dma_tx.ch);
+ rs->dma_tx.ch = NULL;
+ }
+ dev_warn(rs->dev, "Failed to request RX DMA channel\n");
+ }
+
+ if (rs->dma_tx.ch && rs->dma_rx.ch) {
+ rs->dma_tx.addr = (dma_addr_t)(mem->start + ROCKCHIP_SPI_TXDR);
+ rs->dma_rx.addr = (dma_addr_t)(mem->start + ROCKCHIP_SPI_RXDR);
+ rs->dma_tx.direction = DMA_MEM_TO_DEV;
+ rs->dma_tx.direction = DMA_DEV_TO_MEM;
+
+ master->can_dma = rockchip_spi_can_dma;
+ master->dma_tx = rs->dma_tx.ch;
+ master->dma_rx = rs->dma_rx.ch;
+ }
+
+ ret = devm_spi_register_master(&pdev->dev, master);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to register master\n");
+ goto err_register_master;
+ }
+
+ return 0;
+
+err_register_master:
+ if (rs->dma_tx.ch)
+ dma_release_channel(rs->dma_tx.ch);
+ if (rs->dma_rx.ch)
+ dma_release_channel(rs->dma_rx.ch);
+err_get_fifo_len:
+ clk_disable_unprepare(rs->spiclk);
+err_spiclk_enable:
+ clk_disable_unprepare(rs->apb_pclk);
+err_ioremap_resource:
+ spi_master_put(master);
+
+ return ret;
+}
+
+static int rockchip_spi_remove(struct platform_device *pdev)
+{
+ struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
+ struct rockchip_spi *rs = spi_master_get_devdata(master);
+
+ pm_runtime_disable(&pdev->dev);
+
+ clk_disable_unprepare(rs->spiclk);
+ clk_disable_unprepare(rs->apb_pclk);
+
+ if (rs->dma_tx.ch)
+ dma_release_channel(rs->dma_tx.ch);
+ if (rs->dma_rx.ch)
+ dma_release_channel(rs->dma_rx.ch);
+
+ spi_master_put(master);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int rockchip_spi_suspend(struct device *dev)
+{
+ int ret = 0;
+ struct spi_master *master = dev_get_drvdata(dev);
+ struct rockchip_spi *rs = spi_master_get_devdata(master);
+
+ ret = spi_master_suspend(rs->master);
+ if (ret)
+ return ret;
+
+ if (!pm_runtime_suspended(dev)) {
+ clk_disable_unprepare(rs->spiclk);
+ clk_disable_unprepare(rs->apb_pclk);
+ }
+
+ return ret;
+}
+
+static int rockchip_spi_resume(struct device *dev)
+{
+ int ret = 0;
+ struct spi_master *master = dev_get_drvdata(dev);
+ struct rockchip_spi *rs = spi_master_get_devdata(master);
+
+ if (!pm_runtime_suspended(dev)) {
+ ret = clk_prepare_enable(rs->apb_pclk);
+ if (ret < 0)
+ return ret;
+
+ ret = clk_prepare_enable(rs->spiclk);
+ if (ret < 0) {
+ clk_disable_unprepare(rs->apb_pclk);
+ return ret;
+ }
+ }
+
+ ret = spi_master_resume(rs->master);
+ if (ret < 0) {
+ clk_disable_unprepare(rs->spiclk);
+ clk_disable_unprepare(rs->apb_pclk);
+ }
+
+ return ret;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+#ifdef CONFIG_PM_RUNTIME
+static int rockchip_spi_runtime_suspend(struct device *dev)
+{
+ struct spi_master *master = dev_get_drvdata(dev);
+ struct rockchip_spi *rs = spi_master_get_devdata(master);
+
+ clk_disable_unprepare(rs->spiclk);
+ clk_disable_unprepare(rs->apb_pclk);
+
+ return 0;
+}
+
+static int rockchip_spi_runtime_resume(struct device *dev)
+{
+ int ret;
+ struct spi_master *master = dev_get_drvdata(dev);
+ struct rockchip_spi *rs = spi_master_get_devdata(master);
+
+ ret = clk_prepare_enable(rs->apb_pclk);
+ if (ret)
+ return ret;
+
+ ret = clk_prepare_enable(rs->spiclk);
+ if (ret)
+ clk_disable_unprepare(rs->apb_pclk);
+
+ return ret;
+}
+#endif /* CONFIG_PM_RUNTIME */
+
+static const struct dev_pm_ops rockchip_spi_pm = {
+ SET_SYSTEM_SLEEP_PM_OPS(rockchip_spi_suspend, rockchip_spi_resume)
+ SET_RUNTIME_PM_OPS(rockchip_spi_runtime_suspend,
+ rockchip_spi_runtime_resume, NULL)
+};
+
+static const struct of_device_id rockchip_spi_dt_match[] = {
+ { .compatible = "rockchip,rk3066-spi", },
+ { .compatible = "rockchip,rk3188-spi", },
+ { .compatible = "rockchip,rk3288-spi", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, rockchip_spi_dt_match);
+
+static struct platform_driver rockchip_spi_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ .pm = &rockchip_spi_pm,
+ .of_match_table = of_match_ptr(rockchip_spi_dt_match),
+ },
+ .probe = rockchip_spi_probe,
+ .remove = rockchip_spi_remove,
+};
+
+module_platform_driver(rockchip_spi_driver);
+
+MODULE_AUTHOR("Addy Ke <addy.ke@rock-chips.com>");
+MODULE_DESCRIPTION("ROCKCHIP SPI Controller Driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c
index 1011274..c850dfd 100644
--- a/drivers/spi/spi-rspi.c
+++ b/drivers/spi/spi-rspi.c
@@ -477,7 +477,7 @@ static int rspi_dma_transfer(struct rspi_data *rspi, struct sg_table *tx,
tx->sgl, tx->nents, DMA_TO_DEVICE,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc_tx)
- return -EIO;
+ goto no_dma;
irq_mask |= SPCR_SPTIE;
}
@@ -486,7 +486,7 @@ static int rspi_dma_transfer(struct rspi_data *rspi, struct sg_table *tx,
rx->sgl, rx->nents, DMA_FROM_DEVICE,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc_rx)
- return -EIO;
+ goto no_dma;
irq_mask |= SPCR_SPRIE;
}
@@ -540,6 +540,12 @@ static int rspi_dma_transfer(struct rspi_data *rspi, struct sg_table *tx,
enable_irq(rspi->rx_irq);
return ret;
+
+no_dma:
+ pr_warn_once("%s %s: DMA not available, falling back to PIO\n",
+ dev_driver_string(&rspi->master->dev),
+ dev_name(&rspi->master->dev));
+ return -EAGAIN;
}
static void rspi_receive_init(const struct rspi_data *rspi)
@@ -593,8 +599,10 @@ static int rspi_common_transfer(struct rspi_data *rspi,
if (rspi->master->can_dma && __rspi_can_dma(rspi, xfer)) {
/* rx_buf can be NULL on RSPI on SH in TX-only Mode */
- return rspi_dma_transfer(rspi, &xfer->tx_sg,
- xfer->rx_buf ? &xfer->rx_sg : NULL);
+ ret = rspi_dma_transfer(rspi, &xfer->tx_sg,
+ xfer->rx_buf ? &xfer->rx_sg : NULL);
+ if (ret != -EAGAIN)
+ return ret;
}
ret = rspi_pio_transfer(rspi, xfer->tx_buf, xfer->rx_buf, xfer->len);
@@ -630,7 +638,6 @@ static int rspi_rz_transfer_one(struct spi_master *master,
struct spi_transfer *xfer)
{
struct rspi_data *rspi = spi_master_get_devdata(master);
- int ret;
rspi_rz_receive_init(rspi);
@@ -649,8 +656,11 @@ static int qspi_transfer_out(struct rspi_data *rspi, struct spi_transfer *xfer)
{
int ret;
- if (rspi->master->can_dma && __rspi_can_dma(rspi, xfer))
- return rspi_dma_transfer(rspi, &xfer->tx_sg, NULL);
+ if (rspi->master->can_dma && __rspi_can_dma(rspi, xfer)) {
+ ret = rspi_dma_transfer(rspi, &xfer->tx_sg, NULL);
+ if (ret != -EAGAIN)
+ return ret;
+ }
ret = rspi_pio_transfer(rspi, xfer->tx_buf, NULL, xfer->len);
if (ret < 0)
@@ -664,8 +674,11 @@ static int qspi_transfer_out(struct rspi_data *rspi, struct spi_transfer *xfer)
static int qspi_transfer_in(struct rspi_data *rspi, struct spi_transfer *xfer)
{
- if (rspi->master->can_dma && __rspi_can_dma(rspi, xfer))
- return rspi_dma_transfer(rspi, NULL, &xfer->rx_sg);
+ if (rspi->master->can_dma && __rspi_can_dma(rspi, xfer)) {
+ int ret = rspi_dma_transfer(rspi, NULL, &xfer->rx_sg);
+ if (ret != -EAGAIN)
+ return ret;
+ }
return rspi_pio_transfer(rspi, NULL, xfer->rx_buf, xfer->len);
}
@@ -927,19 +940,19 @@ static int rspi_request_dma(struct device *dev, struct spi_master *master,
return 0;
}
-static void rspi_release_dma(struct rspi_data *rspi)
+static void rspi_release_dma(struct spi_master *master)
{
- if (rspi->master->dma_tx)
- dma_release_channel(rspi->master->dma_tx);
- if (rspi->master->dma_rx)
- dma_release_channel(rspi->master->dma_rx);
+ if (master->dma_tx)
+ dma_release_channel(master->dma_tx);
+ if (master->dma_rx)
+ dma_release_channel(master->dma_rx);
}
static int rspi_remove(struct platform_device *pdev)
{
struct rspi_data *rspi = platform_get_drvdata(pdev);
- rspi_release_dma(rspi);
+ rspi_release_dma(rspi->master);
pm_runtime_disable(&pdev->dev);
return 0;
@@ -1141,7 +1154,7 @@ static int rspi_probe(struct platform_device *pdev)
return 0;
error3:
- rspi_release_dma(rspi);
+ rspi_release_dma(master);
error2:
pm_runtime_disable(&pdev->dev);
error1:
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 75a5696..1c36311 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -197,7 +197,6 @@ struct s3c64xx_spi_driver_data {
struct s3c64xx_spi_dma_data tx_dma;
struct s3c64xx_spi_port_config *port_conf;
unsigned int port_id;
- bool cs_gpio;
};
static void flush_fifo(struct s3c64xx_spi_driver_data *sdd)
@@ -754,10 +753,8 @@ static struct s3c64xx_spi_csinfo *s3c64xx_get_slave_ctrldata(
{
struct s3c64xx_spi_csinfo *cs;
struct device_node *slave_np, *data_np = NULL;
- struct s3c64xx_spi_driver_data *sdd;
u32 fb_delay = 0;
- sdd = spi_master_get_devdata(spi->master);
slave_np = spi->dev.of_node;
if (!slave_np) {
dev_err(&spi->dev, "device node not found\n");
@@ -776,17 +773,6 @@ static struct s3c64xx_spi_csinfo *s3c64xx_get_slave_ctrldata(
return ERR_PTR(-ENOMEM);
}
- /* The CS line is asserted/deasserted by the gpio pin */
- if (sdd->cs_gpio)
- cs->line = of_get_named_gpio(data_np, "cs-gpio", 0);
-
- if (!gpio_is_valid(cs->line)) {
- dev_err(&spi->dev, "chip select gpio is not specified or invalid\n");
- kfree(cs);
- of_node_put(data_np);
- return ERR_PTR(-EINVAL);
- }
-
of_property_read_u32(data_np, "samsung,spi-feedback-delay", &fb_delay);
cs->fb_delay = fb_delay;
of_node_put(data_np);
@@ -807,9 +793,16 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
int err;
sdd = spi_master_get_devdata(spi->master);
- if (!cs && spi->dev.of_node) {
+ if (spi->dev.of_node) {
cs = s3c64xx_get_slave_ctrldata(spi);
spi->controller_data = cs;
+ } else if (cs) {
+ /* On non-DT platforms the SPI core will set spi->cs_gpio
+ * to -ENOENT. The GPIO pin used to drive the chip select
+ * is defined by using platform data so spi->cs_gpio value
+ * has to be override to have the proper GPIO pin number.
+ */
+ spi->cs_gpio = cs->line;
}
if (IS_ERR_OR_NULL(cs)) {
@@ -818,18 +811,15 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
}
if (!spi_get_ctldata(spi)) {
- /* Request gpio only if cs line is asserted by gpio pins */
- if (sdd->cs_gpio) {
- err = gpio_request_one(cs->line, GPIOF_OUT_INIT_HIGH,
- dev_name(&spi->dev));
+ if (gpio_is_valid(spi->cs_gpio)) {
+ err = gpio_request_one(spi->cs_gpio, GPIOF_OUT_INIT_HIGH,
+ dev_name(&spi->dev));
if (err) {
dev_err(&spi->dev,
"Failed to get /CS gpio [%d]: %d\n",
- cs->line, err);
+ spi->cs_gpio, err);
goto err_gpio_req;
}
-
- spi->cs_gpio = cs->line;
}
spi_set_ctldata(spi, cs);
@@ -884,7 +874,8 @@ setup_exit:
/* setup() returns with device de-selected */
writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
- gpio_free(cs->line);
+ if (gpio_is_valid(spi->cs_gpio))
+ gpio_free(spi->cs_gpio);
spi_set_ctldata(spi, NULL);
err_gpio_req:
@@ -897,14 +888,21 @@ err_gpio_req:
static void s3c64xx_spi_cleanup(struct spi_device *spi)
{
struct s3c64xx_spi_csinfo *cs = spi_get_ctldata(spi);
- struct s3c64xx_spi_driver_data *sdd;
- sdd = spi_master_get_devdata(spi->master);
- if (spi->cs_gpio) {
+ if (gpio_is_valid(spi->cs_gpio)) {
gpio_free(spi->cs_gpio);
if (spi->dev.of_node)
kfree(cs);
+ else {
+ /* On non-DT platforms, the SPI core sets
+ * spi->cs_gpio to -ENOENT and .setup()
+ * overrides it with the GPIO pin value
+ * passed using platform data.
+ */
+ spi->cs_gpio = -ENOENT;
+ }
}
+
spi_set_ctldata(spi, NULL);
}
@@ -1075,11 +1073,7 @@ static int s3c64xx_spi_probe(struct platform_device *pdev)
sdd->cntrlr_info = sci;
sdd->pdev = pdev;
sdd->sfr_start = mem_res->start;
- sdd->cs_gpio = true;
if (pdev->dev.of_node) {
- if (!of_find_property(pdev->dev.of_node, "cs-gpio", NULL))
- sdd->cs_gpio = false;
-
ret = of_alias_get_id(pdev->dev.of_node, "spi");
if (ret < 0) {
dev_err(&pdev->dev, "failed to get alias id, errno %d\n",
diff --git a/drivers/spi/spi-sh-hspi.c b/drivers/spi/spi-sh-hspi.c
index c8e795e..94b5fae 100644
--- a/drivers/spi/spi-sh-hspi.c
+++ b/drivers/spi/spi-sh-hspi.c
@@ -304,7 +304,7 @@ static int hspi_remove(struct platform_device *pdev)
return 0;
}
-static struct of_device_id hspi_of_match[] = {
+static const struct of_device_id hspi_of_match[] = {
{ .compatible = "renesas,hspi", },
{ /* sentinel */ }
};
diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c
index 45b0914..2a4354d 100644
--- a/drivers/spi/spi-sh-msiof.c
+++ b/drivers/spi/spi-sh-msiof.c
@@ -2,6 +2,7 @@
* SuperH MSIOF SPI Master Interface
*
* Copyright (c) 2009 Magnus Damm
+ * Copyright (C) 2014 Glider bvba
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -13,6 +14,8 @@
#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
@@ -23,6 +26,7 @@
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
+#include <linux/sh_dma.h>
#include <linux/spi/sh_msiof.h>
#include <linux/spi/spi.h>
@@ -37,6 +41,7 @@ struct sh_msiof_chipdata {
};
struct sh_msiof_spi_priv {
+ struct spi_master *master;
void __iomem *mapbase;
struct clk *clk;
struct platform_device *pdev;
@@ -45,6 +50,10 @@ struct sh_msiof_spi_priv {
struct completion done;
int tx_fifo_size;
int rx_fifo_size;
+ void *tx_dma_page;
+ void *rx_dma_page;
+ dma_addr_t tx_dma_addr;
+ dma_addr_t rx_dma_addr;
};
#define TMDR1 0x00 /* Transmit Mode Register 1 */
@@ -84,6 +93,8 @@ struct sh_msiof_spi_priv {
#define MDR2_WDLEN1(i) (((i) - 1) << 16) /* Word Count (1-64/256 (SH, A1))) */
#define MDR2_GRPMASK1 0x00000001 /* Group Output Mask 1 (SH, A1) */
+#define MAX_WDLEN 256U
+
/* TSCR and RSCR */
#define SCR_BRPS_MASK 0x1f00 /* Prescaler Setting (1-32) */
#define SCR_BRPS(i) (((i) - 1) << 8)
@@ -113,9 +124,61 @@ struct sh_msiof_spi_priv {
#define CTR_TXE 0x00000200 /* Transmit Enable */
#define CTR_RXE 0x00000100 /* Receive Enable */
-/* STR and IER */
+/* FCTR */
+#define FCTR_TFWM_MASK 0xe0000000 /* Transmit FIFO Watermark */
+#define FCTR_TFWM_64 0x00000000 /* Transfer Request when 64 empty stages */
+#define FCTR_TFWM_32 0x20000000 /* Transfer Request when 32 empty stages */
+#define FCTR_TFWM_24 0x40000000 /* Transfer Request when 24 empty stages */
+#define FCTR_TFWM_16 0x60000000 /* Transfer Request when 16 empty stages */
+#define FCTR_TFWM_12 0x80000000 /* Transfer Request when 12 empty stages */
+#define FCTR_TFWM_8 0xa0000000 /* Transfer Request when 8 empty stages */
+#define FCTR_TFWM_4 0xc0000000 /* Transfer Request when 4 empty stages */
+#define FCTR_TFWM_1 0xe0000000 /* Transfer Request when 1 empty stage */
+#define FCTR_TFUA_MASK 0x07f00000 /* Transmit FIFO Usable Area */
+#define FCTR_TFUA_SHIFT 20
+#define FCTR_TFUA(i) ((i) << FCTR_TFUA_SHIFT)
+#define FCTR_RFWM_MASK 0x0000e000 /* Receive FIFO Watermark */
+#define FCTR_RFWM_1 0x00000000 /* Transfer Request when 1 valid stages */
+#define FCTR_RFWM_4 0x00002000 /* Transfer Request when 4 valid stages */
+#define FCTR_RFWM_8 0x00004000 /* Transfer Request when 8 valid stages */
+#define FCTR_RFWM_16 0x00006000 /* Transfer Request when 16 valid stages */
+#define FCTR_RFWM_32 0x00008000 /* Transfer Request when 32 valid stages */
+#define FCTR_RFWM_64 0x0000a000 /* Transfer Request when 64 valid stages */
+#define FCTR_RFWM_128 0x0000c000 /* Transfer Request when 128 valid stages */
+#define FCTR_RFWM_256 0x0000e000 /* Transfer Request when 256 valid stages */
+#define FCTR_RFUA_MASK 0x00001ff0 /* Receive FIFO Usable Area (0x40 = full) */
+#define FCTR_RFUA_SHIFT 4
+#define FCTR_RFUA(i) ((i) << FCTR_RFUA_SHIFT)
+
+/* STR */
+#define STR_TFEMP 0x20000000 /* Transmit FIFO Empty */
+#define STR_TDREQ 0x10000000 /* Transmit Data Transfer Request */
#define STR_TEOF 0x00800000 /* Frame Transmission End */
+#define STR_TFSERR 0x00200000 /* Transmit Frame Synchronization Error */
+#define STR_TFOVF 0x00100000 /* Transmit FIFO Overflow */
+#define STR_TFUDF 0x00080000 /* Transmit FIFO Underflow */
+#define STR_RFFUL 0x00002000 /* Receive FIFO Full */
+#define STR_RDREQ 0x00001000 /* Receive Data Transfer Request */
#define STR_REOF 0x00000080 /* Frame Reception End */
+#define STR_RFSERR 0x00000020 /* Receive Frame Synchronization Error */
+#define STR_RFUDF 0x00000010 /* Receive FIFO Underflow */
+#define STR_RFOVF 0x00000008 /* Receive FIFO Overflow */
+
+/* IER */
+#define IER_TDMAE 0x80000000 /* Transmit Data DMA Transfer Req. Enable */
+#define IER_TFEMPE 0x20000000 /* Transmit FIFO Empty Enable */
+#define IER_TDREQE 0x10000000 /* Transmit Data Transfer Request Enable */
+#define IER_TEOFE 0x00800000 /* Frame Transmission End Enable */
+#define IER_TFSERRE 0x00200000 /* Transmit Frame Sync Error Enable */
+#define IER_TFOVFE 0x00100000 /* Transmit FIFO Overflow Enable */
+#define IER_TFUDFE 0x00080000 /* Transmit FIFO Underflow Enable */
+#define IER_RDMAE 0x00008000 /* Receive Data DMA Transfer Req. Enable */
+#define IER_RFFULE 0x00002000 /* Receive FIFO Full Enable */
+#define IER_RDREQE 0x00001000 /* Receive Data Transfer Request Enable */
+#define IER_REOFE 0x00000080 /* Frame Reception End Enable */
+#define IER_RFSERRE 0x00000020 /* Receive Frame Sync Error Enable */
+#define IER_RFUDFE 0x00000010 /* Receive FIFO Underflow Enable */
+#define IER_RFOVFE 0x00000008 /* Receive FIFO Overflow Enable */
static u32 sh_msiof_read(struct sh_msiof_spi_priv *p, int reg_offs)
@@ -230,8 +293,6 @@ static void sh_msiof_spi_set_pin_regs(struct sh_msiof_spi_priv *p,
* 1 0 11 11 0 0
* 1 1 11 11 1 1
*/
- sh_msiof_write(p, FCTR, 0);
-
tmp = MDR1_SYNCMD_SPI | 1 << MDR1_FLD_SHIFT | MDR1_XXSTP;
tmp |= !cs_high << MDR1_SYNCAC_SHIFT;
tmp |= lsb_first << MDR1_BITLSB_SHIFT;
@@ -267,8 +328,6 @@ static void sh_msiof_spi_set_mode_regs(struct sh_msiof_spi_priv *p,
if (rx_buf)
sh_msiof_write(p, RMDR2, dr2);
-
- sh_msiof_write(p, IER, STR_TEOF | STR_REOF);
}
static void sh_msiof_reset_str(struct sh_msiof_spi_priv *p)
@@ -457,6 +516,40 @@ static int sh_msiof_prepare_message(struct spi_master *master,
return 0;
}
+static int sh_msiof_spi_start(struct sh_msiof_spi_priv *p, void *rx_buf)
+{
+ int ret;
+
+ /* setup clock and rx/tx signals */
+ ret = sh_msiof_modify_ctr_wait(p, 0, CTR_TSCKE);
+ if (rx_buf && !ret)
+ ret = sh_msiof_modify_ctr_wait(p, 0, CTR_RXE);
+ if (!ret)
+ ret = sh_msiof_modify_ctr_wait(p, 0, CTR_TXE);
+
+ /* start by setting frame bit */
+ if (!ret)
+ ret = sh_msiof_modify_ctr_wait(p, 0, CTR_TFSE);
+
+ return ret;
+}
+
+static int sh_msiof_spi_stop(struct sh_msiof_spi_priv *p, void *rx_buf)
+{
+ int ret;
+
+ /* shut down frame, rx/tx and clock signals */
+ ret = sh_msiof_modify_ctr_wait(p, CTR_TFSE, 0);
+ if (!ret)
+ ret = sh_msiof_modify_ctr_wait(p, CTR_TXE, 0);
+ if (rx_buf && !ret)
+ ret = sh_msiof_modify_ctr_wait(p, CTR_RXE, 0);
+ if (!ret)
+ ret = sh_msiof_modify_ctr_wait(p, CTR_TSCKE, 0);
+
+ return ret;
+}
+
static int sh_msiof_spi_txrx_once(struct sh_msiof_spi_priv *p,
void (*tx_fifo)(struct sh_msiof_spi_priv *,
const void *, int, int),
@@ -477,29 +570,32 @@ static int sh_msiof_spi_txrx_once(struct sh_msiof_spi_priv *p,
/* the fifo contents need shifting */
fifo_shift = 32 - bits;
+ /* default FIFO watermarks for PIO */
+ sh_msiof_write(p, FCTR, 0);
+
/* setup msiof transfer mode registers */
sh_msiof_spi_set_mode_regs(p, tx_buf, rx_buf, bits, words);
+ sh_msiof_write(p, IER, IER_TEOFE | IER_REOFE);
/* write tx fifo */
if (tx_buf)
tx_fifo(p, tx_buf, words, fifo_shift);
- /* setup clock and rx/tx signals */
- ret = sh_msiof_modify_ctr_wait(p, 0, CTR_TSCKE);
- if (rx_buf)
- ret = ret ? ret : sh_msiof_modify_ctr_wait(p, 0, CTR_RXE);
- ret = ret ? ret : sh_msiof_modify_ctr_wait(p, 0, CTR_TXE);
-
- /* start by setting frame bit */
reinit_completion(&p->done);
- ret = ret ? ret : sh_msiof_modify_ctr_wait(p, 0, CTR_TFSE);
+
+ ret = sh_msiof_spi_start(p, rx_buf);
if (ret) {
dev_err(&p->pdev->dev, "failed to start hardware\n");
- goto err;
+ goto stop_ier;
}
/* wait for tx fifo to be emptied / rx fifo to be filled */
- wait_for_completion(&p->done);
+ ret = wait_for_completion_timeout(&p->done, HZ);
+ if (!ret) {
+ dev_err(&p->pdev->dev, "PIO timeout\n");
+ ret = -ETIMEDOUT;
+ goto stop_reset;
+ }
/* read rx fifo */
if (rx_buf)
@@ -508,41 +604,248 @@ static int sh_msiof_spi_txrx_once(struct sh_msiof_spi_priv *p,
/* clear status bits */
sh_msiof_reset_str(p);
- /* shut down frame, rx/tx and clock signals */
- ret = sh_msiof_modify_ctr_wait(p, CTR_TFSE, 0);
- ret = ret ? ret : sh_msiof_modify_ctr_wait(p, CTR_TXE, 0);
- if (rx_buf)
- ret = ret ? ret : sh_msiof_modify_ctr_wait(p, CTR_RXE, 0);
- ret = ret ? ret : sh_msiof_modify_ctr_wait(p, CTR_TSCKE, 0);
+ ret = sh_msiof_spi_stop(p, rx_buf);
if (ret) {
dev_err(&p->pdev->dev, "failed to shut down hardware\n");
- goto err;
+ return ret;
}
return words;
- err:
+stop_reset:
+ sh_msiof_reset_str(p);
+ sh_msiof_spi_stop(p, rx_buf);
+stop_ier:
+ sh_msiof_write(p, IER, 0);
+ return ret;
+}
+
+static void sh_msiof_dma_complete(void *arg)
+{
+ struct sh_msiof_spi_priv *p = arg;
+
+ sh_msiof_write(p, IER, 0);
+ complete(&p->done);
+}
+
+static int sh_msiof_dma_once(struct sh_msiof_spi_priv *p, const void *tx,
+ void *rx, unsigned int len)
+{
+ u32 ier_bits = 0;
+ struct dma_async_tx_descriptor *desc_tx = NULL, *desc_rx = NULL;
+ dma_cookie_t cookie;
+ int ret;
+
+ if (tx) {
+ ier_bits |= IER_TDREQE | IER_TDMAE;
+ dma_sync_single_for_device(p->master->dma_tx->device->dev,
+ p->tx_dma_addr, len, DMA_TO_DEVICE);
+ desc_tx = dmaengine_prep_slave_single(p->master->dma_tx,
+ p->tx_dma_addr, len, DMA_TO_DEVICE,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!desc_tx)
+ return -EAGAIN;
+ }
+
+ if (rx) {
+ ier_bits |= IER_RDREQE | IER_RDMAE;
+ desc_rx = dmaengine_prep_slave_single(p->master->dma_rx,
+ p->rx_dma_addr, len, DMA_FROM_DEVICE,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!desc_rx)
+ return -EAGAIN;
+ }
+
+ /* 1 stage FIFO watermarks for DMA */
+ sh_msiof_write(p, FCTR, FCTR_TFWM_1 | FCTR_RFWM_1);
+
+ /* setup msiof transfer mode registers (32-bit words) */
+ sh_msiof_spi_set_mode_regs(p, tx, rx, 32, len / 4);
+
+ sh_msiof_write(p, IER, ier_bits);
+
+ reinit_completion(&p->done);
+
+ if (rx) {
+ desc_rx->callback = sh_msiof_dma_complete;
+ desc_rx->callback_param = p;
+ cookie = dmaengine_submit(desc_rx);
+ if (dma_submit_error(cookie)) {
+ ret = cookie;
+ goto stop_ier;
+ }
+ dma_async_issue_pending(p->master->dma_rx);
+ }
+
+ if (tx) {
+ if (rx) {
+ /* No callback */
+ desc_tx->callback = NULL;
+ } else {
+ desc_tx->callback = sh_msiof_dma_complete;
+ desc_tx->callback_param = p;
+ }
+ cookie = dmaengine_submit(desc_tx);
+ if (dma_submit_error(cookie)) {
+ ret = cookie;
+ goto stop_rx;
+ }
+ dma_async_issue_pending(p->master->dma_tx);
+ }
+
+ ret = sh_msiof_spi_start(p, rx);
+ if (ret) {
+ dev_err(&p->pdev->dev, "failed to start hardware\n");
+ goto stop_tx;
+ }
+
+ /* wait for tx fifo to be emptied / rx fifo to be filled */
+ ret = wait_for_completion_timeout(&p->done, HZ);
+ if (!ret) {
+ dev_err(&p->pdev->dev, "DMA timeout\n");
+ ret = -ETIMEDOUT;
+ goto stop_reset;
+ }
+
+ /* clear status bits */
+ sh_msiof_reset_str(p);
+
+ ret = sh_msiof_spi_stop(p, rx);
+ if (ret) {
+ dev_err(&p->pdev->dev, "failed to shut down hardware\n");
+ return ret;
+ }
+
+ if (rx)
+ dma_sync_single_for_cpu(p->master->dma_rx->device->dev,
+ p->rx_dma_addr, len,
+ DMA_FROM_DEVICE);
+
+ return 0;
+
+stop_reset:
+ sh_msiof_reset_str(p);
+ sh_msiof_spi_stop(p, rx);
+stop_tx:
+ if (tx)
+ dmaengine_terminate_all(p->master->dma_tx);
+stop_rx:
+ if (rx)
+ dmaengine_terminate_all(p->master->dma_rx);
+stop_ier:
sh_msiof_write(p, IER, 0);
return ret;
}
+static void copy_bswap32(u32 *dst, const u32 *src, unsigned int words)
+{
+ /* src or dst can be unaligned, but not both */
+ if ((unsigned long)src & 3) {
+ while (words--) {
+ *dst++ = swab32(get_unaligned(src));
+ src++;
+ }
+ } else if ((unsigned long)dst & 3) {
+ while (words--) {
+ put_unaligned(swab32(*src++), dst);
+ dst++;
+ }
+ } else {
+ while (words--)
+ *dst++ = swab32(*src++);
+ }
+}
+
+static void copy_wswap32(u32 *dst, const u32 *src, unsigned int words)
+{
+ /* src or dst can be unaligned, but not both */
+ if ((unsigned long)src & 3) {
+ while (words--) {
+ *dst++ = swahw32(get_unaligned(src));
+ src++;
+ }
+ } else if ((unsigned long)dst & 3) {
+ while (words--) {
+ put_unaligned(swahw32(*src++), dst);
+ dst++;
+ }
+ } else {
+ while (words--)
+ *dst++ = swahw32(*src++);
+ }
+}
+
+static void copy_plain32(u32 *dst, const u32 *src, unsigned int words)
+{
+ memcpy(dst, src, words * 4);
+}
+
static int sh_msiof_transfer_one(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *t)
{
struct sh_msiof_spi_priv *p = spi_master_get_devdata(master);
+ void (*copy32)(u32 *, const u32 *, unsigned int);
void (*tx_fifo)(struct sh_msiof_spi_priv *, const void *, int, int);
void (*rx_fifo)(struct sh_msiof_spi_priv *, void *, int, int);
- int bits;
- int bytes_per_word;
- int bytes_done;
- int words;
+ const void *tx_buf = t->tx_buf;
+ void *rx_buf = t->rx_buf;
+ unsigned int len = t->len;
+ unsigned int bits = t->bits_per_word;
+ unsigned int bytes_per_word;
+ unsigned int words;
int n;
bool swab;
+ int ret;
- bits = t->bits_per_word;
+ /* setup clocks (clock already enabled in chipselect()) */
+ sh_msiof_spi_set_clk_regs(p, clk_get_rate(p->clk), t->speed_hz);
- if (bits <= 8 && t->len > 15 && !(t->len & 3)) {
+ while (master->dma_tx && len > 15) {
+ /*
+ * DMA supports 32-bit words only, hence pack 8-bit and 16-bit
+ * words, with byte resp. word swapping.
+ */
+ unsigned int l = min(len, MAX_WDLEN * 4);
+
+ if (bits <= 8) {
+ if (l & 3)
+ break;
+ copy32 = copy_bswap32;
+ } else if (bits <= 16) {
+ if (l & 1)
+ break;
+ copy32 = copy_wswap32;
+ } else {
+ copy32 = copy_plain32;
+ }
+
+ if (tx_buf)
+ copy32(p->tx_dma_page, tx_buf, l / 4);
+
+ ret = sh_msiof_dma_once(p, tx_buf, rx_buf, l);
+ if (ret == -EAGAIN) {
+ pr_warn_once("%s %s: DMA not available, falling back to PIO\n",
+ dev_driver_string(&p->pdev->dev),
+ dev_name(&p->pdev->dev));
+ break;
+ }
+ if (ret)
+ return ret;
+
+ if (rx_buf) {
+ copy32(rx_buf, p->rx_dma_page, l / 4);
+ rx_buf += l;
+ }
+ if (tx_buf)
+ tx_buf += l;
+
+ len -= l;
+ if (!len)
+ return 0;
+ }
+
+ if (bits <= 8 && len > 15 && !(len & 3)) {
bits = 32;
swab = true;
} else {
@@ -556,57 +859,52 @@ static int sh_msiof_transfer_one(struct spi_master *master,
rx_fifo = sh_msiof_spi_read_fifo_8;
} else if (bits <= 16) {
bytes_per_word = 2;
- if ((unsigned long)t->tx_buf & 0x01)
+ if ((unsigned long)tx_buf & 0x01)
tx_fifo = sh_msiof_spi_write_fifo_16u;
else
tx_fifo = sh_msiof_spi_write_fifo_16;
- if ((unsigned long)t->rx_buf & 0x01)
+ if ((unsigned long)rx_buf & 0x01)
rx_fifo = sh_msiof_spi_read_fifo_16u;
else
rx_fifo = sh_msiof_spi_read_fifo_16;
} else if (swab) {
bytes_per_word = 4;
- if ((unsigned long)t->tx_buf & 0x03)
+ if ((unsigned long)tx_buf & 0x03)
tx_fifo = sh_msiof_spi_write_fifo_s32u;
else
tx_fifo = sh_msiof_spi_write_fifo_s32;
- if ((unsigned long)t->rx_buf & 0x03)
+ if ((unsigned long)rx_buf & 0x03)
rx_fifo = sh_msiof_spi_read_fifo_s32u;
else
rx_fifo = sh_msiof_spi_read_fifo_s32;
} else {
bytes_per_word = 4;
- if ((unsigned long)t->tx_buf & 0x03)
+ if ((unsigned long)tx_buf & 0x03)
tx_fifo = sh_msiof_spi_write_fifo_32u;
else
tx_fifo = sh_msiof_spi_write_fifo_32;
- if ((unsigned long)t->rx_buf & 0x03)
+ if ((unsigned long)rx_buf & 0x03)
rx_fifo = sh_msiof_spi_read_fifo_32u;
else
rx_fifo = sh_msiof_spi_read_fifo_32;
}
- /* setup clocks (clock already enabled in chipselect()) */
- sh_msiof_spi_set_clk_regs(p, clk_get_rate(p->clk), t->speed_hz);
-
/* transfer in fifo sized chunks */
- words = t->len / bytes_per_word;
- bytes_done = 0;
-
- while (bytes_done < t->len) {
- void *rx_buf = t->rx_buf ? t->rx_buf + bytes_done : NULL;
- const void *tx_buf = t->tx_buf ? t->tx_buf + bytes_done : NULL;
- n = sh_msiof_spi_txrx_once(p, tx_fifo, rx_fifo,
- tx_buf,
- rx_buf,
+ words = len / bytes_per_word;
+
+ while (words > 0) {
+ n = sh_msiof_spi_txrx_once(p, tx_fifo, rx_fifo, tx_buf, rx_buf,
words, bits);
if (n < 0)
- break;
+ return n;
- bytes_done += n * bytes_per_word;
+ if (tx_buf)
+ tx_buf += n * bytes_per_word;
+ if (rx_buf)
+ rx_buf += n * bytes_per_word;
words -= n;
}
@@ -663,6 +961,128 @@ static struct sh_msiof_spi_info *sh_msiof_spi_parse_dt(struct device *dev)
}
#endif
+static struct dma_chan *sh_msiof_request_dma_chan(struct device *dev,
+ enum dma_transfer_direction dir, unsigned int id, dma_addr_t port_addr)
+{
+ dma_cap_mask_t mask;
+ struct dma_chan *chan;
+ struct dma_slave_config cfg;
+ int ret;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+
+ chan = dma_request_channel(mask, shdma_chan_filter,
+ (void *)(unsigned long)id);
+ if (!chan) {
+ dev_warn(dev, "dma_request_channel failed\n");
+ return NULL;
+ }
+
+ memset(&cfg, 0, sizeof(cfg));
+ cfg.slave_id = id;
+ cfg.direction = dir;
+ if (dir == DMA_MEM_TO_DEV)
+ cfg.dst_addr = port_addr;
+ else
+ cfg.src_addr = port_addr;
+
+ ret = dmaengine_slave_config(chan, &cfg);
+ if (ret) {
+ dev_warn(dev, "dmaengine_slave_config failed %d\n", ret);
+ dma_release_channel(chan);
+ return NULL;
+ }
+
+ return chan;
+}
+
+static int sh_msiof_request_dma(struct sh_msiof_spi_priv *p)
+{
+ struct platform_device *pdev = p->pdev;
+ struct device *dev = &pdev->dev;
+ const struct sh_msiof_spi_info *info = dev_get_platdata(dev);
+ const struct resource *res;
+ struct spi_master *master;
+ struct device *tx_dev, *rx_dev;
+
+ if (!info || !info->dma_tx_id || !info->dma_rx_id)
+ return 0; /* The driver assumes no error */
+
+ /* The DMA engine uses the second register set, if present */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!res)
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+ master = p->master;
+ master->dma_tx = sh_msiof_request_dma_chan(dev, DMA_MEM_TO_DEV,
+ info->dma_tx_id,
+ res->start + TFDR);
+ if (!master->dma_tx)
+ return -ENODEV;
+
+ master->dma_rx = sh_msiof_request_dma_chan(dev, DMA_DEV_TO_MEM,
+ info->dma_rx_id,
+ res->start + RFDR);
+ if (!master->dma_rx)
+ goto free_tx_chan;
+
+ p->tx_dma_page = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
+ if (!p->tx_dma_page)
+ goto free_rx_chan;
+
+ p->rx_dma_page = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
+ if (!p->rx_dma_page)
+ goto free_tx_page;
+
+ tx_dev = master->dma_tx->device->dev;
+ p->tx_dma_addr = dma_map_single(tx_dev, p->tx_dma_page, PAGE_SIZE,
+ DMA_TO_DEVICE);
+ if (dma_mapping_error(tx_dev, p->tx_dma_addr))
+ goto free_rx_page;
+
+ rx_dev = master->dma_rx->device->dev;
+ p->rx_dma_addr = dma_map_single(rx_dev, p->rx_dma_page, PAGE_SIZE,
+ DMA_FROM_DEVICE);
+ if (dma_mapping_error(rx_dev, p->rx_dma_addr))
+ goto unmap_tx_page;
+
+ dev_info(dev, "DMA available");
+ return 0;
+
+unmap_tx_page:
+ dma_unmap_single(tx_dev, p->tx_dma_addr, PAGE_SIZE, DMA_TO_DEVICE);
+free_rx_page:
+ free_page((unsigned long)p->rx_dma_page);
+free_tx_page:
+ free_page((unsigned long)p->tx_dma_page);
+free_rx_chan:
+ dma_release_channel(master->dma_rx);
+free_tx_chan:
+ dma_release_channel(master->dma_tx);
+ master->dma_tx = NULL;
+ return -ENODEV;
+}
+
+static void sh_msiof_release_dma(struct sh_msiof_spi_priv *p)
+{
+ struct spi_master *master = p->master;
+ struct device *dev;
+
+ if (!master->dma_tx)
+ return;
+
+ dev = &p->pdev->dev;
+ dma_unmap_single(master->dma_rx->device->dev, p->rx_dma_addr,
+ PAGE_SIZE, DMA_FROM_DEVICE);
+ dma_unmap_single(master->dma_tx->device->dev, p->tx_dma_addr,
+ PAGE_SIZE, DMA_TO_DEVICE);
+ free_page((unsigned long)p->rx_dma_page);
+ free_page((unsigned long)p->tx_dma_page);
+ dma_release_channel(master->dma_rx);
+ dma_release_channel(master->dma_tx);
+}
+
static int sh_msiof_spi_probe(struct platform_device *pdev)
{
struct resource *r;
@@ -681,6 +1101,7 @@ static int sh_msiof_spi_probe(struct platform_device *pdev)
p = spi_master_get_devdata(master);
platform_set_drvdata(pdev, p);
+ p->master = master;
of_id = of_match_device(sh_msiof_match, &pdev->dev);
if (of_id) {
@@ -751,6 +1172,10 @@ static int sh_msiof_spi_probe(struct platform_device *pdev)
master->auto_runtime_pm = true;
master->transfer_one = sh_msiof_transfer_one;
+ ret = sh_msiof_request_dma(p);
+ if (ret < 0)
+ dev_warn(&pdev->dev, "DMA not available, using PIO\n");
+
ret = devm_spi_register_master(&pdev->dev, master);
if (ret < 0) {
dev_err(&pdev->dev, "spi_register_master error.\n");
@@ -760,6 +1185,7 @@ static int sh_msiof_spi_probe(struct platform_device *pdev)
return 0;
err2:
+ sh_msiof_release_dma(p);
pm_runtime_disable(&pdev->dev);
err1:
spi_master_put(master);
@@ -768,6 +1194,9 @@ static int sh_msiof_spi_probe(struct platform_device *pdev)
static int sh_msiof_spi_remove(struct platform_device *pdev)
{
+ struct sh_msiof_spi_priv *p = platform_get_drvdata(pdev);
+
+ sh_msiof_release_dma(p);
pm_runtime_disable(&pdev->dev);
return 0;
}
diff --git a/drivers/spi/spi-sh.c b/drivers/spi/spi-sh.c
index 03edf5e..8e171a7 100644
--- a/drivers/spi/spi-sh.c
+++ b/drivers/spi/spi-sh.c
@@ -432,7 +432,6 @@ static int spi_sh_remove(struct platform_device *pdev)
spi_unregister_master(ss->master);
destroy_workqueue(ss->workqueue);
free_irq(ss->irq, ss);
- iounmap(ss->addr);
return 0;
}
@@ -480,7 +479,7 @@ static int spi_sh_probe(struct platform_device *pdev)
}
ss->irq = irq;
ss->master = master;
- ss->addr = ioremap(res->start, resource_size(res));
+ ss->addr = devm_ioremap(&pdev->dev, res->start, resource_size(res));
if (ss->addr == NULL) {
dev_err(&pdev->dev, "ioremap error.\n");
ret = -ENOMEM;
@@ -495,13 +494,13 @@ static int spi_sh_probe(struct platform_device *pdev)
if (ss->workqueue == NULL) {
dev_err(&pdev->dev, "create workqueue error\n");
ret = -EBUSY;
- goto error2;
+ goto error1;
}
ret = request_irq(irq, spi_sh_irq, 0, "spi_sh", ss);
if (ret < 0) {
dev_err(&pdev->dev, "request_irq error\n");
- goto error3;
+ goto error2;
}
master->num_chipselect = 2;
@@ -513,17 +512,15 @@ static int spi_sh_probe(struct platform_device *pdev)
ret = spi_register_master(master);
if (ret < 0) {
printk(KERN_ERR "spi_register_master error.\n");
- goto error4;
+ goto error3;
}
return 0;
- error4:
- free_irq(irq, ss);
error3:
- destroy_workqueue(ss->workqueue);
+ free_irq(irq, ss);
error2:
- iounmap(ss->addr);
+ destroy_workqueue(ss->workqueue);
error1:
spi_master_put(master);
diff --git a/drivers/spi/spi-topcliff-pch.c b/drivers/spi/spi-topcliff-pch.c
index f05abf8..0a87ec3 100644
--- a/drivers/spi/spi-topcliff-pch.c
+++ b/drivers/spi/spi-topcliff-pch.c
@@ -874,8 +874,8 @@ static void pch_spi_request_dma(struct pch_spi_data *data, int bpw)
dma_cap_set(DMA_SLAVE, mask);
/* Get DMA's dev information */
- dma_dev = pci_get_bus_and_slot(data->board_dat->pdev->bus->number,
- PCI_DEVFN(12, 0));
+ dma_dev = pci_get_slot(data->board_dat->pdev->bus,
+ PCI_DEVFN(PCI_SLOT(data->board_dat->pdev->devfn), 0));
/* Set Tx DMA */
param = &dma->param_tx;
@@ -1047,8 +1047,8 @@ static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw)
num, DMA_DEV_TO_MEM,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc_rx) {
- dev_err(&data->master->dev, "%s:device_prep_slave_sg Failed\n",
- __func__);
+ dev_err(&data->master->dev,
+ "%s:dmaengine_prep_slave_sg Failed\n", __func__);
return;
}
dma_sync_sg_for_device(&data->master->dev, sg, num, DMA_FROM_DEVICE);
@@ -1106,8 +1106,8 @@ static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw)
sg, num, DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc_tx) {
- dev_err(&data->master->dev, "%s:device_prep_slave_sg Failed\n",
- __func__);
+ dev_err(&data->master->dev,
+ "%s:dmaengine_prep_slave_sg Failed\n", __func__);
return;
}
dma_sync_sg_for_device(&data->master->dev, sg, num, DMA_TO_DEVICE);
diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c
index a3b0b99..4d8efb1 100644
--- a/drivers/spi/spi-xilinx.c
+++ b/drivers/spi/spi-xilinx.c
@@ -369,7 +369,7 @@ static int xilinx_spi_probe(struct platform_device *pdev)
goto put_master;
}
- master->bus_num = pdev->dev.id;
+ master->bus_num = pdev->id;
master->num_chipselect = num_cs;
master->dev.of_node = pdev->dev.of_node;
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 22aa41c..e0531ba 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -350,14 +350,12 @@ static DEFINE_MUTEX(board_lock);
struct spi_device *spi_alloc_device(struct spi_master *master)
{
struct spi_device *spi;
- struct device *dev = master->dev.parent;
if (!spi_master_get(master))
return NULL;
spi = kzalloc(sizeof(*spi), GFP_KERNEL);
if (!spi) {
- dev_err(dev, "cannot alloc spi_device\n");
spi_master_put(master);
return NULL;
}
@@ -624,6 +622,8 @@ static int spi_map_buf(struct spi_master *master, struct device *dev,
}
ret = dma_map_sg(dev, sgt->sgl, sgt->nents, dir);
+ if (!ret)
+ ret = -ENOMEM;
if (ret < 0) {
sg_free_table(sgt);
return ret;
@@ -652,8 +652,8 @@ static int __spi_map_msg(struct spi_master *master, struct spi_message *msg)
if (!master->can_dma)
return 0;
- tx_dev = &master->dma_tx->dev->device;
- rx_dev = &master->dma_rx->dev->device;
+ tx_dev = master->dma_tx->device->dev;
+ rx_dev = master->dma_rx->device->dev;
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
if (!master->can_dma(master, msg->spi, xfer))
@@ -692,8 +692,8 @@ static int spi_unmap_msg(struct spi_master *master, struct spi_message *msg)
if (!master->cur_msg_mapped || !master->can_dma)
return 0;
- tx_dev = &master->dma_tx->dev->device;
- rx_dev = &master->dma_rx->dev->device;
+ tx_dev = master->dma_tx->device->dev;
+ rx_dev = master->dma_rx->device->dev;
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
if (!master->can_dma(master, msg->spi, xfer))
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