diff options
Diffstat (limited to 'drivers/i2c')
-rw-r--r-- | drivers/i2c/busses/Kconfig | 2 | ||||
-rw-r--r-- | drivers/i2c/busses/i2c-pnx.c | 157 | ||||
-rw-r--r-- | drivers/i2c/busses/i2c-powermac.c | 98 | ||||
-rw-r--r-- | drivers/i2c/busses/i2c-s6000.c | 2 | ||||
-rw-r--r-- | drivers/i2c/busses/i2c-s6000.h | 2 |
5 files changed, 191 insertions, 70 deletions
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index d2c5095..94468a6 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -351,7 +351,7 @@ config I2C_DAVINCI For details please see http://www.ti.com/davinci config I2C_DESIGNWARE_PLATFORM - tristate "Synopsys DesignWare Platfrom" + tristate "Synopsys DesignWare Platform" depends on HAVE_CLK help If you say yes to this option, support will be included for the diff --git a/drivers/i2c/busses/i2c-pnx.c b/drivers/i2c/busses/i2c-pnx.c index eb8ad53..99389d2 100644 --- a/drivers/i2c/busses/i2c-pnx.c +++ b/drivers/i2c/busses/i2c-pnx.c @@ -23,16 +23,61 @@ #include <linux/err.h> #include <linux/clk.h> #include <linux/slab.h> +#include <linux/of_i2c.h> + +#define I2C_PNX_TIMEOUT_DEFAULT 10 /* msec */ +#define I2C_PNX_SPEED_KHZ_DEFAULT 100 +#define I2C_PNX_REGION_SIZE 0x100 + +enum { + mstatus_tdi = 0x00000001, + mstatus_afi = 0x00000002, + mstatus_nai = 0x00000004, + mstatus_drmi = 0x00000008, + mstatus_active = 0x00000020, + mstatus_scl = 0x00000040, + mstatus_sda = 0x00000080, + mstatus_rff = 0x00000100, + mstatus_rfe = 0x00000200, + mstatus_tff = 0x00000400, + mstatus_tfe = 0x00000800, +}; -#include <mach/hardware.h> -#include <mach/i2c.h> +enum { + mcntrl_tdie = 0x00000001, + mcntrl_afie = 0x00000002, + mcntrl_naie = 0x00000004, + mcntrl_drmie = 0x00000008, + mcntrl_daie = 0x00000020, + mcntrl_rffie = 0x00000040, + mcntrl_tffie = 0x00000080, + mcntrl_reset = 0x00000100, + mcntrl_cdbmode = 0x00000400, +}; -#define I2C_PNX_TIMEOUT 10 /* msec */ -#define I2C_PNX_SPEED_KHZ 100 -#define I2C_PNX_REGION_SIZE 0x100 +enum { + rw_bit = 1 << 0, + start_bit = 1 << 8, + stop_bit = 1 << 9, +}; -static inline int wait_timeout(long timeout, struct i2c_pnx_algo_data *data) +#define I2C_REG_RX(a) ((a)->ioaddr) /* Rx FIFO reg (RO) */ +#define I2C_REG_TX(a) ((a)->ioaddr) /* Tx FIFO reg (WO) */ +#define I2C_REG_STS(a) ((a)->ioaddr + 0x04) /* Status reg (RO) */ +#define I2C_REG_CTL(a) ((a)->ioaddr + 0x08) /* Ctl reg */ +#define I2C_REG_CKL(a) ((a)->ioaddr + 0x0c) /* Clock divider low */ +#define I2C_REG_CKH(a) ((a)->ioaddr + 0x10) /* Clock divider high */ +#define I2C_REG_ADR(a) ((a)->ioaddr + 0x14) /* I2C address */ +#define I2C_REG_RFL(a) ((a)->ioaddr + 0x18) /* Rx FIFO level (RO) */ +#define I2C_REG_TFL(a) ((a)->ioaddr + 0x1c) /* Tx FIFO level (RO) */ +#define I2C_REG_RXB(a) ((a)->ioaddr + 0x20) /* Num of bytes Rx-ed (RO) */ +#define I2C_REG_TXB(a) ((a)->ioaddr + 0x24) /* Num of bytes Tx-ed (RO) */ +#define I2C_REG_TXS(a) ((a)->ioaddr + 0x28) /* Tx slave FIFO (RO) */ +#define I2C_REG_STFL(a) ((a)->ioaddr + 0x2c) /* Tx slave FIFO level (RO) */ + +static inline int wait_timeout(struct i2c_pnx_algo_data *data) { + long timeout = data->timeout; while (timeout > 0 && (ioread32(I2C_REG_STS(data)) & mstatus_active)) { mdelay(1); @@ -41,8 +86,9 @@ static inline int wait_timeout(long timeout, struct i2c_pnx_algo_data *data) return (timeout <= 0); } -static inline int wait_reset(long timeout, struct i2c_pnx_algo_data *data) +static inline int wait_reset(struct i2c_pnx_algo_data *data) { + long timeout = data->timeout; while (timeout > 0 && (ioread32(I2C_REG_CTL(data)) & mcntrl_reset)) { mdelay(1); @@ -54,7 +100,7 @@ static inline int wait_reset(long timeout, struct i2c_pnx_algo_data *data) static inline void i2c_pnx_arm_timer(struct i2c_pnx_algo_data *alg_data) { struct timer_list *timer = &alg_data->mif.timer; - unsigned long expires = msecs_to_jiffies(I2C_PNX_TIMEOUT); + unsigned long expires = msecs_to_jiffies(alg_data->timeout); if (expires <= 1) expires = 2; @@ -92,7 +138,7 @@ static int i2c_pnx_start(unsigned char slave_addr, } /* First, make sure bus is idle */ - if (wait_timeout(I2C_PNX_TIMEOUT, alg_data)) { + if (wait_timeout(alg_data)) { /* Somebody else is monopolizing the bus */ dev_err(&alg_data->adapter.dev, "%s: Bus busy. Slave addr = %02x, cntrl = %x, stat = %x\n", @@ -185,7 +231,7 @@ static int i2c_pnx_master_xmit(struct i2c_pnx_algo_data *alg_data) if (alg_data->mif.len == 0) { if (alg_data->last) { /* Wait until the STOP is seen. */ - if (wait_timeout(I2C_PNX_TIMEOUT, alg_data)) + if (wait_timeout(alg_data)) dev_err(&alg_data->adapter.dev, "The bus is still active after timeout\n"); } @@ -283,7 +329,7 @@ static int i2c_pnx_master_rcv(struct i2c_pnx_algo_data *alg_data) if (alg_data->mif.len == 0) { if (alg_data->last) /* Wait until the STOP is seen. */ - if (wait_timeout(I2C_PNX_TIMEOUT, alg_data)) + if (wait_timeout(alg_data)) dev_err(&alg_data->adapter.dev, "The bus is still active after timeout\n"); @@ -399,7 +445,7 @@ static void i2c_pnx_timeout(unsigned long data) ctl |= mcntrl_reset; iowrite32(ctl, I2C_REG_CTL(alg_data)); - wait_reset(I2C_PNX_TIMEOUT, alg_data); + wait_reset(alg_data); alg_data->mif.ret = -EIO; complete(&alg_data->mif.complete); } @@ -414,18 +460,18 @@ static inline void bus_reset_if_active(struct i2c_pnx_algo_data *alg_data) alg_data->adapter.name); iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_reset, I2C_REG_CTL(alg_data)); - wait_reset(I2C_PNX_TIMEOUT, alg_data); + wait_reset(alg_data); } else if (!(stat & mstatus_rfe) || !(stat & mstatus_tfe)) { /* If there is data in the fifo's after transfer, * flush fifo's by reset. */ iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_reset, I2C_REG_CTL(alg_data)); - wait_reset(I2C_PNX_TIMEOUT, alg_data); + wait_reset(alg_data); } else if (stat & mstatus_nai) { iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_reset, I2C_REG_CTL(alg_data)); - wait_reset(I2C_PNX_TIMEOUT, alg_data); + wait_reset(alg_data); } } @@ -568,14 +614,8 @@ static int __devinit i2c_pnx_probe(struct platform_device *pdev) int ret = 0; struct i2c_pnx_algo_data *alg_data; unsigned long freq; - struct i2c_pnx_data *i2c_pnx = pdev->dev.platform_data; - - if (!i2c_pnx || !i2c_pnx->name) { - dev_err(&pdev->dev, "%s: no platform data supplied\n", - __func__); - ret = -EINVAL; - goto out; - } + struct resource *res; + u32 speed = I2C_PNX_SPEED_KHZ_DEFAULT * 1000; alg_data = kzalloc(sizeof(*alg_data), GFP_KERNEL); if (!alg_data) { @@ -585,14 +625,27 @@ static int __devinit i2c_pnx_probe(struct platform_device *pdev) platform_set_drvdata(pdev, alg_data); - strlcpy(alg_data->adapter.name, i2c_pnx->name, - sizeof(alg_data->adapter.name)); alg_data->adapter.dev.parent = &pdev->dev; alg_data->adapter.algo = &pnx_algorithm; alg_data->adapter.algo_data = alg_data; alg_data->adapter.nr = pdev->id; - alg_data->i2c_pnx = i2c_pnx; + alg_data->timeout = I2C_PNX_TIMEOUT_DEFAULT; +#ifdef CONFIG_OF + alg_data->adapter.dev.of_node = of_node_get(pdev->dev.of_node); + if (pdev->dev.of_node) { + of_property_read_u32(pdev->dev.of_node, "clock-frequency", + &speed); + /* + * At this point, it is planned to add an OF timeout property. + * As soon as there is a consensus about how to call and handle + * this, sth. like the following can be put here: + * + * of_property_read_u32(pdev->dev.of_node, "timeout", + * &alg_data->timeout); + */ + } +#endif alg_data->clk = clk_get(&pdev->dev, NULL); if (IS_ERR(alg_data->clk)) { ret = PTR_ERR(alg_data->clk); @@ -603,17 +656,27 @@ static int __devinit i2c_pnx_probe(struct platform_device *pdev) alg_data->mif.timer.function = i2c_pnx_timeout; alg_data->mif.timer.data = (unsigned long)alg_data; + snprintf(alg_data->adapter.name, sizeof(alg_data->adapter.name), + "%s", pdev->name); + /* Register I/O resource */ - if (!request_mem_region(i2c_pnx->base, I2C_PNX_REGION_SIZE, + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "Unable to get mem resource.\n"); + ret = -EBUSY; + goto out_clkget; + } + if (!request_mem_region(res->start, I2C_PNX_REGION_SIZE, pdev->name)) { dev_err(&pdev->dev, "I/O region 0x%08x for I2C already in use.\n", - i2c_pnx->base); - ret = -ENODEV; + res->start); + ret = -ENOMEM; goto out_clkget; } - alg_data->ioaddr = ioremap(i2c_pnx->base, I2C_PNX_REGION_SIZE); + alg_data->base = res->start; + alg_data->ioaddr = ioremap(res->start, I2C_PNX_REGION_SIZE); if (!alg_data->ioaddr) { dev_err(&pdev->dev, "Couldn't ioremap I2C I/O region\n"); ret = -ENOMEM; @@ -637,20 +700,25 @@ static int __devinit i2c_pnx_probe(struct platform_device *pdev) * the deglitching filter length. */ - tmp = ((freq / 1000) / I2C_PNX_SPEED_KHZ) / 2 - 2; + tmp = (freq / speed) / 2 - 2; if (tmp > 0x3FF) tmp = 0x3FF; iowrite32(tmp, I2C_REG_CKH(alg_data)); iowrite32(tmp, I2C_REG_CKL(alg_data)); iowrite32(mcntrl_reset, I2C_REG_CTL(alg_data)); - if (wait_reset(I2C_PNX_TIMEOUT, alg_data)) { + if (wait_reset(alg_data)) { ret = -ENODEV; goto out_clock; } init_completion(&alg_data->mif.complete); - ret = request_irq(i2c_pnx->irq, i2c_pnx_interrupt, + alg_data->irq = platform_get_irq(pdev, 0); + if (alg_data->irq < 0) { + dev_err(&pdev->dev, "Failed to get IRQ from platform resource\n"); + goto out_irq; + } + ret = request_irq(alg_data->irq, i2c_pnx_interrupt, 0, pdev->name, alg_data); if (ret) goto out_clock; @@ -662,39 +730,39 @@ static int __devinit i2c_pnx_probe(struct platform_device *pdev) goto out_irq; } + of_i2c_register_devices(&alg_data->adapter); + dev_dbg(&pdev->dev, "%s: Master at %#8x, irq %d.\n", - alg_data->adapter.name, i2c_pnx->base, i2c_pnx->irq); + alg_data->adapter.name, res->start, alg_data->irq); return 0; out_irq: - free_irq(i2c_pnx->irq, alg_data); + free_irq(alg_data->irq, alg_data); out_clock: clk_disable(alg_data->clk); out_unmap: iounmap(alg_data->ioaddr); out_release: - release_mem_region(i2c_pnx->base, I2C_PNX_REGION_SIZE); + release_mem_region(res->start, I2C_PNX_REGION_SIZE); out_clkget: clk_put(alg_data->clk); out_drvdata: kfree(alg_data); err_kzalloc: platform_set_drvdata(pdev, NULL); -out: return ret; } static int __devexit i2c_pnx_remove(struct platform_device *pdev) { struct i2c_pnx_algo_data *alg_data = platform_get_drvdata(pdev); - struct i2c_pnx_data *i2c_pnx = alg_data->i2c_pnx; - free_irq(i2c_pnx->irq, alg_data); + free_irq(alg_data->irq, alg_data); i2c_del_adapter(&alg_data->adapter); clk_disable(alg_data->clk); iounmap(alg_data->ioaddr); - release_mem_region(i2c_pnx->base, I2C_PNX_REGION_SIZE); + release_mem_region(alg_data->base, I2C_PNX_REGION_SIZE); clk_put(alg_data->clk); kfree(alg_data); platform_set_drvdata(pdev, NULL); @@ -702,10 +770,19 @@ static int __devexit i2c_pnx_remove(struct platform_device *pdev) return 0; } +#ifdef CONFIG_OF +static const struct of_device_id i2c_pnx_of_match[] = { + { .compatible = "nxp,pnx-i2c" }, + { }, +}; +MODULE_DEVICE_TABLE(of, i2c_pnx_of_match); +#endif + static struct platform_driver i2c_pnx_driver = { .driver = { .name = "pnx-i2c", .owner = THIS_MODULE, + .of_match_table = of_match_ptr(i2c_pnx_of_match), }, .probe = i2c_pnx_probe, .remove = __devexit_p(i2c_pnx_remove), diff --git a/drivers/i2c/busses/i2c-powermac.c b/drivers/i2c/busses/i2c-powermac.c index 7b397c6..31c47e1 100644 --- a/drivers/i2c/busses/i2c-powermac.c +++ b/drivers/i2c/busses/i2c-powermac.c @@ -227,6 +227,72 @@ static int __devexit i2c_powermac_remove(struct platform_device *dev) return 0; } +static void __devinit i2c_powermac_register_devices(struct i2c_adapter *adap, + struct pmac_i2c_bus *bus) +{ + struct i2c_client *newdev; + struct device_node *node; + + for_each_child_of_node(adap->dev.of_node, node) { + struct i2c_board_info info = {}; + struct dev_archdata dev_ad = {}; + const __be32 *reg; + char tmp[16]; + u32 addr; + int len; + + /* Get address & channel */ + reg = of_get_property(node, "reg", &len); + if (!reg || (len < sizeof(int))) { + dev_err(&adap->dev, "i2c-powermac: invalid reg on %s\n", + node->full_name); + continue; + } + addr = be32_to_cpup(reg); + + /* Multibus setup, check channel */ + if (!pmac_i2c_match_adapter(node, adap)) + continue; + + dev_dbg(&adap->dev, "i2c-powermac: register %s\n", + node->full_name); + + /* Make up a modalias. Note: we to _NOT_ want the standard + * i2c drivers to match with any of our powermac stuff + * unless they have been specifically modified to handle + * it on a case by case basis. For example, for thermal + * control, things like lm75 etc... shall match with their + * corresponding windfarm drivers, _NOT_ the generic ones, + * so we force a prefix of AAPL, onto the modalias to + * make that happen + */ + if (of_modalias_node(node, tmp, sizeof(tmp)) < 0) { + dev_err(&adap->dev, "i2c-powermac: modalias failure" + " on %s\n", node->full_name); + continue; + } + snprintf(info.type, sizeof(info.type), "MAC,%s", tmp); + + /* Fill out the rest of the info structure */ + info.addr = (addr & 0xff) >> 1; + info.irq = irq_of_parse_and_map(node, 0); + info.of_node = of_node_get(node); + info.archdata = &dev_ad; + + newdev = i2c_new_device(adap, &info); + if (!newdev) { + dev_err(&adap->dev, "i2c-powermac: Failure to register" + " %s\n", node->full_name); + of_node_put(node); + /* We do not dispose of the interrupt mapping on + * purpose. It's not necessary (interrupt cannot be + * re-used) and somebody else might have grabbed it + * via direct DT lookup so let's not bother + */ + continue; + } + } +} static int __devinit i2c_powermac_probe(struct platform_device *dev) { @@ -272,6 +338,7 @@ static int __devinit i2c_powermac_probe(struct platform_device *dev) adapter->algo = &i2c_powermac_algorithm; i2c_set_adapdata(adapter, bus); adapter->dev.parent = &dev->dev; + adapter->dev.of_node = dev->dev.of_node; rc = i2c_add_adapter(adapter); if (rc) { printk(KERN_ERR "i2c-powermac: Adapter %s registration " @@ -281,33 +348,10 @@ static int __devinit i2c_powermac_probe(struct platform_device *dev) printk(KERN_INFO "PowerMac i2c bus %s registered\n", adapter->name); - if (!strncmp(basename, "uni-n", 5)) { - struct device_node *np; - const u32 *prop; - struct i2c_board_info info; - - /* Instantiate I2C motion sensor if present */ - np = of_find_node_by_name(NULL, "accelerometer"); - if (np && of_device_is_compatible(np, "AAPL,accelerometer_1") && - (prop = of_get_property(np, "reg", NULL))) { - int i2c_bus; - const char *tmp_bus; - - /* look for bus either using "reg" or by path */ - tmp_bus = strstr(np->full_name, "/i2c-bus@"); - if (tmp_bus) - i2c_bus = *(tmp_bus + 9) - '0'; - else - i2c_bus = ((*prop) >> 8) & 0x0f; - - if (pmac_i2c_get_channel(bus) == i2c_bus) { - memset(&info, 0, sizeof(struct i2c_board_info)); - info.addr = ((*prop) & 0xff) >> 1; - strlcpy(info.type, "ams", I2C_NAME_SIZE); - i2c_new_device(adapter, &info); - } - } - } + /* Cannot use of_i2c_register_devices() due to Apple device-tree + * funkyness + */ + i2c_powermac_register_devices(adapter, bus); return rc; } diff --git a/drivers/i2c/busses/i2c-s6000.c b/drivers/i2c/busses/i2c-s6000.c index c64ba73..b76a29d 100644 --- a/drivers/i2c/busses/i2c-s6000.c +++ b/drivers/i2c/busses/i2c-s6000.c @@ -3,7 +3,7 @@ * * Description: Driver for S6000 Family I2C Interface * Copyright (c) 2008 emlix GmbH - * Author: Oskar Schirmer <os@emlix.com> + * Author: Oskar Schirmer <oskar@scara.com> * * Partially based on i2c-bfin-twi.c driver by <sonic.zhang@analog.com> * Copyright (c) 2005-2007 Analog Devices, Inc. diff --git a/drivers/i2c/busses/i2c-s6000.h b/drivers/i2c/busses/i2c-s6000.h index ff23b81..4936f9f 100644 --- a/drivers/i2c/busses/i2c-s6000.h +++ b/drivers/i2c/busses/i2c-s6000.h @@ -6,7 +6,7 @@ * for more details. * * Copyright (C) 2008 Emlix GmbH <info@emlix.com> - * Author: Oskar Schirmer <os@emlix.com> + * Author: Oskar Schirmer <oskar@scara.com> */ #ifndef __DRIVERS_I2C_BUSSES_I2C_S6000_H |