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Merge branches 'for-32/i2c/nomadik', 'for-32/i2c/s3c2410-dt' and 'for-32/i2c/tegra-iomem' into for-linus/i2c-3.2

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This commit is contained in:
Ben Dooks 2011-11-01 00:54:17 +00:00
commit 3945fe9314
4 changed files with 206 additions and 52 deletions
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39
Documentation/devicetree/bindings/i2c/samsung-i2c.txt Normal file
View File

@ -0,0 +1,39 @@
* Samsung's I2C controller
The Samsung's I2C controller is used to interface with I2C devices.
Required properties:
- compatible: value should be either of the following.
(a) "samsung, s3c2410-i2c", for i2c compatible with s3c2410 i2c.
(b) "samsung, s3c2440-i2c", for i2c compatible with s3c2440 i2c.
- reg: physical base address of the controller and length of memory mapped
region.
- interrupts: interrupt number to the cpu.
- samsung,i2c-sda-delay: Delay (in ns) applied to data line (SDA) edges.
- gpios: The order of the gpios should be the following: <SDA, SCL>.
The gpio specifier depends on the gpio controller.
Optional properties:
- samsung,i2c-slave-addr: Slave address in multi-master enviroment. If not
specified, default value is 0.
- samsung,i2c-max-bus-freq: Desired frequency in Hz of the bus. If not
specified, the default value in Hz is 100000.
Example:
i2c@13870000 {
compatible = "samsung,s3c2440-i2c";
reg = <0x13870000 0x100>;
interrupts = <345>;
samsung,i2c-sda-delay = <100>;
samsung,i2c-max-bus-freq = <100000>;
gpios = <&gpd1 2 0 /* SDA */
&gpd1 3 0 /* SCL */>;
#address-cells = <1>;
#size-cells = <0>;
wm8994@1a {
compatible = "wlf,wm8994";
reg = <0x1a>;
};
};

89
drivers/i2c/busses/i2c-nomadik.c
View File

@ -63,11 +63,11 @@
/* Master controller (MCR) register */
#define I2C_MCR_OP (0x1 << 0) /* Operation */
#define I2C_MCR_A7 (0x7f << 1) /* 7-bit address */
#define I2C_MCR_EA10 (0x7 << 8) /* 10-bit Extended address */
#define I2C_MCR_EA10 (0x7 << 8) /* 10-bit Extended address */
#define I2C_MCR_SB (0x1 << 11) /* Extended address */
#define I2C_MCR_AM (0x3 << 12) /* Address type */
#define I2C_MCR_STOP (0x1 << 14) /* Stop condition */
#define I2C_MCR_LENGTH (0x7ff << 15) /* Transaction length */
#define I2C_MCR_STOP (0x1 << 14) /* Stop condition */
#define I2C_MCR_LENGTH (0x7ff << 15) /* Transaction length */
/* Status register (SR) */
#define I2C_SR_OP (0x3 << 0) /* Operation */
@ -77,7 +77,7 @@
#define I2C_SR_LENGTH (0x7ff << 9) /* Transfer length */
/* Interrupt mask set/clear (IMSCR) bits */
#define I2C_IT_TXFE (0x1 << 0)
#define I2C_IT_TXFE (0x1 << 0)
#define I2C_IT_TXFNE (0x1 << 1)
#define I2C_IT_TXFF (0x1 << 2)
#define I2C_IT_TXFOVR (0x1 << 3)
@ -135,31 +135,31 @@ struct i2c_nmk_client {
};
/**
* struct nmk_i2c_dev - private data structure of the controller
* @pdev: parent platform device
* @adap: corresponding I2C adapter
* @irq: interrupt line for the controller
* @virtbase: virtual io memory area
* @clk: hardware i2c block clock
* @cfg: machine provided controller configuration
* @cli: holder of client specific data
* @stop: stop condition
* @xfer_complete: acknowledge completion for a I2C message
* @result: controller propogated result
* @regulator: pointer to i2c regulator
* @busy: Busy doing transfer
* struct nmk_i2c_dev - private data structure of the controller.
* @pdev: parent platform device.
* @adap: corresponding I2C adapter.
* @irq: interrupt line for the controller.
* @virtbase: virtual io memory area.
* @clk: hardware i2c block clock.
* @cfg: machine provided controller configuration.
* @cli: holder of client specific data.
* @stop: stop condition.
* @xfer_complete: acknowledge completion for a I2C message.
* @result: controller propogated result.
* @regulator: pointer to i2c regulator.
* @busy: Busy doing transfer.
*/
struct nmk_i2c_dev {
struct platform_device *pdev;
struct i2c_adapter adap;
int irq;
struct i2c_adapter adap;
int irq;
void __iomem *virtbase;
struct clk *clk;
struct nmk_i2c_controller cfg;
struct i2c_nmk_client cli;
int stop;
int stop;
struct completion xfer_complete;
int result;
int result;
struct regulator *regulator;
bool busy;
};
@ -217,8 +217,9 @@ static int flush_i2c_fifo(struct nmk_i2c_dev *dev)
}
}
dev_err(&dev->pdev->dev, "flushing operation timed out "
"giving up after %d attempts", LOOP_ATTEMPTS);
dev_err(&dev->pdev->dev,
"flushing operation timed out giving up after %d attempts",
LOOP_ATTEMPTS);
return -ETIMEDOUT;
}
@ -270,7 +271,7 @@ static int init_hw(struct nmk_i2c_dev *dev)
}
/* enable peripheral, master mode operation */
#define DEFAULT_I2C_REG_CR ((1 << 1) | I2C_CR_PE)
#define DEFAULT_I2C_REG_CR ((1 << 1) | I2C_CR_PE)
/**
* load_i2c_mcr_reg() - load the MCR register
@ -363,8 +364,8 @@ static void setup_i2c_controller(struct nmk_i2c_dev *dev)
* and high speed (up to 3.4 Mb/s)
*/
if (dev->cfg.sm > I2C_FREQ_MODE_FAST) {
dev_err(&dev->pdev->dev, "do not support this mode "
"defaulting to std. mode\n");
dev_err(&dev->pdev->dev,
"do not support this mode defaulting to std. mode\n");
brcr2 = i2c_clk/(100000 * 2) & 0xffff;
writel((brcr1 | brcr2), dev->virtbase + I2C_BRCR);
writel(I2C_FREQ_MODE_STANDARD << 4,
@ -423,7 +424,7 @@ static int read_i2c(struct nmk_i2c_dev *dev)
if (timeout < 0) {
dev_err(&dev->pdev->dev,
"wait_for_completion_timeout"
"wait_for_completion_timeout "
"returned %d waiting for event\n", timeout);
status = timeout;
}
@ -556,8 +557,8 @@ static int nmk_i2c_xfer_one(struct nmk_i2c_dev *dev, u16 flags)
if (((i2c_sr >> 2) & 0x3) == 0x3) {
/* get the abort cause */
cause = (i2c_sr >> 4) & 0x7;
dev_err(&dev->pdev->dev, "%s\n", cause
>= ARRAY_SIZE(abort_causes) ?
dev_err(&dev->pdev->dev, "%s\n",
cause >= ARRAY_SIZE(abort_causes) ?
"unknown reason" :
abort_causes[cause]);
}
@ -582,13 +583,13 @@ static int nmk_i2c_xfer_one(struct nmk_i2c_dev *dev, u16 flags)
*
* NOTE:
* READ TRANSFER : We impose a restriction of the first message to be the
* index message for any read transaction.
* - a no index is coded as '0',
* - 2byte big endian index is coded as '3'
* !!! msg[0].buf holds the actual index.
* This is compatible with generic messages of smbus emulator
* that send a one byte index.
* eg. a I2C transation to read 2 bytes from index 0
* index message for any read transaction.
* - a no index is coded as '0',
* - 2byte big endian index is coded as '3'
* !!! msg[0].buf holds the actual index.
* This is compatible with generic messages of smbus emulator
* that send a one byte index.
* eg. a I2C transation to read 2 bytes from index 0
* idx = 0;
* msg[0].addr = client->addr;
* msg[0].flags = 0x0;
@ -644,8 +645,8 @@ static int nmk_i2c_xfer(struct i2c_adapter *i2c_adap,
for (i = 0; i < num_msgs; i++) {
if (unlikely(msgs[i].flags & I2C_M_TEN)) {
dev_err(&dev->pdev->dev, "10 bit addressing"
"not supported\n");
dev_err(&dev->pdev->dev,
"10 bit addressing not supported\n");
status = -EINVAL;
goto out;
@ -789,8 +790,9 @@ static irqreturn_t i2c_irq_handler(int irq, void *arg)
if (dev->cli.count) {
dev->result = -EIO;
dev_err(&dev->pdev->dev, "%lu bytes still remain to be"
"xfered\n", dev->cli.count);
dev_err(&dev->pdev->dev,
"%lu bytes still remain to be xfered\n",
dev->cli.count);
(void) init_hw(dev);
}
complete(&dev->xfer_complete);
@ -923,7 +925,7 @@ static int __devinit nmk_i2c_probe(struct platform_device *pdev)
}
if (request_mem_region(res->start, resource_size(res),
DRIVER_NAME "I/O region") == NULL) {
DRIVER_NAME "I/O region") == NULL) {
ret = -EBUSY;
goto err_no_region;
}
@ -980,8 +982,9 @@ static int __devinit nmk_i2c_probe(struct platform_device *pdev)
i2c_set_adapdata(adap, dev);
dev_info(&pdev->dev, "initialize %s on virtual "
"base %p\n", adap->name, dev->virtbase);
dev_info(&pdev->dev,
"initialize %s on virtual base %p\n",
adap->name, dev->virtbase);
ret = i2c_add_numbered_adapter(adap);
if (ret) {

128
drivers/i2c/busses/i2c-s3c2410.c
View File

@ -35,6 +35,8 @@
#include <linux/cpufreq.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/of_i2c.h>
#include <linux/of_gpio.h>
#include <asm/irq.h>
@ -78,6 +80,8 @@ struct s3c24xx_i2c {
struct resource *ioarea;
struct i2c_adapter adap;
struct s3c2410_platform_i2c *pdata;
int gpios[2];
#ifdef CONFIG_CPU_FREQ
struct notifier_block freq_transition;
#endif
@ -95,6 +99,12 @@ static inline int s3c24xx_i2c_is2440(struct s3c24xx_i2c *i2c)
struct platform_device *pdev = to_platform_device(i2c->dev);
enum s3c24xx_i2c_type type;
#ifdef CONFIG_OF
if (i2c->dev->of_node)
return of_device_is_compatible(i2c->dev->of_node,
"samsung,s3c2440-i2c");
#endif
type = platform_get_device_id(pdev)->driver_data;
return type == TYPE_S3C2440;
}
@ -625,7 +635,7 @@ static int s3c24xx_i2c_calcdivisor(unsigned long clkin, unsigned int wanted,
static int s3c24xx_i2c_clockrate(struct s3c24xx_i2c *i2c, unsigned int *got)
{
struct s3c2410_platform_i2c *pdata = i2c->dev->platform_data;
struct s3c2410_platform_i2c *pdata = i2c->pdata;
unsigned long clkin = clk_get_rate(i2c->clk);
unsigned int divs, div1;
unsigned long target_frequency;
@ -741,6 +751,49 @@ static inline void s3c24xx_i2c_deregister_cpufreq(struct s3c24xx_i2c *i2c)
}
#endif
#ifdef CONFIG_OF
static int s3c24xx_i2c_parse_dt_gpio(struct s3c24xx_i2c *i2c)
{
int idx, gpio, ret;
for (idx = 0; idx < 2; idx++) {
gpio = of_get_gpio(i2c->dev->of_node, idx);
if (!gpio_is_valid(gpio)) {
dev_err(i2c->dev, "invalid gpio[%d]: %d\n", idx, gpio);
goto free_gpio;
}
ret = gpio_request(gpio, "i2c-bus");
if (ret) {
dev_err(i2c->dev, "gpio [%d] request failed\n", gpio);
goto free_gpio;
}
}
return 0;
free_gpio:
while (--idx >= 0)
gpio_free(i2c->gpios[idx]);
return -EINVAL;
}
static void s3c24xx_i2c_dt_gpio_free(struct s3c24xx_i2c *i2c)
{
unsigned int idx;
for (idx = 0; idx < 2; idx++)
gpio_free(i2c->gpios[idx]);
}
#else
static int s3c24xx_i2c_parse_dt_gpio(struct s3c24xx_i2c *i2c)
{
return -EINVAL;
}
static void s3c24xx_i2c_dt_gpio_free(struct s3c24xx_i2c *i2c)
{
}
#endif
/* s3c24xx_i2c_init
*
* initialise the controller, set the IO lines and frequency
@ -754,12 +807,15 @@ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
/* get the plafrom data */
pdata = i2c->dev->platform_data;
pdata = i2c->pdata;
/* inititalise the gpio */
if (pdata->cfg_gpio)
pdata->cfg_gpio(to_platform_device(i2c->dev));
else
if (s3c24xx_i2c_parse_dt_gpio(i2c))
return -EINVAL;
/* write slave address */
@ -785,6 +841,34 @@ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
return 0;
}
#ifdef CONFIG_OF
/* s3c24xx_i2c_parse_dt
*
* Parse the device tree node and retreive the platform data.
*/
static void
s3c24xx_i2c_parse_dt(struct device_node *np, struct s3c24xx_i2c *i2c)
{
struct s3c2410_platform_i2c *pdata = i2c->pdata;
if (!np)
return;
pdata->bus_num = -1; /* i2c bus number is dynamically assigned */
of_property_read_u32(np, "samsung,i2c-sda-delay", &pdata->sda_delay);
of_property_read_u32(np, "samsung,i2c-slave-addr", &pdata->slave_addr);
of_property_read_u32(np, "samsung,i2c-max-bus-freq",
(u32 *)&pdata->frequency);
}
#else
static void
s3c24xx_i2c_parse_dt(struct device_node *np, struct s3c24xx_i2c *i2c)
{
return;
}
#endif
/* s3c24xx_i2c_probe
*
* called by the bus driver when a suitable device is found
@ -793,14 +877,16 @@ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
static int s3c24xx_i2c_probe(struct platform_device *pdev)
{
struct s3c24xx_i2c *i2c;
struct s3c2410_platform_i2c *pdata;
struct s3c2410_platform_i2c *pdata = NULL;
struct resource *res;
int ret;
pdata = pdev->dev.platform_data;
if (!pdata) {
dev_err(&pdev->dev, "no platform data\n");
return -EINVAL;
if (!pdev->dev.of_node) {
pdata = pdev->dev.platform_data;
if (!pdata) {
dev_err(&pdev->dev, "no platform data\n");
return -EINVAL;
}
}
i2c = kzalloc(sizeof(struct s3c24xx_i2c), GFP_KERNEL);
@ -809,6 +895,17 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
return -ENOMEM;
}
i2c->pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!i2c->pdata) {
ret = -ENOMEM;
goto err_noclk;
}
if (pdata)
memcpy(i2c->pdata, pdata, sizeof(*pdata));
else
s3c24xx_i2c_parse_dt(pdev->dev.of_node, i2c);
strlcpy(i2c->adap.name, "s3c2410-i2c", sizeof(i2c->adap.name));
i2c->adap.owner = THIS_MODULE;
i2c->adap.algo = &s3c24xx_i2c_algorithm;
@ -903,7 +1000,8 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
* being bus 0.
*/
i2c->adap.nr = pdata->bus_num;
i2c->adap.nr = i2c->pdata->bus_num;
i2c->adap.dev.of_node = pdev->dev.of_node;
ret = i2c_add_numbered_adapter(&i2c->adap);
if (ret < 0) {
@ -911,6 +1009,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
goto err_cpufreq;
}
of_i2c_register_devices(&i2c->adap);
platform_set_drvdata(pdev, i2c);
dev_info(&pdev->dev, "%s: S3C I2C adapter\n", dev_name(&i2c->adap.dev));
@ -959,6 +1058,7 @@ static int s3c24xx_i2c_remove(struct platform_device *pdev)
iounmap(i2c->regs);
release_resource(i2c->ioarea);
s3c24xx_i2c_dt_gpio_free(i2c);
kfree(i2c->ioarea);
kfree(i2c);
@ -1012,6 +1112,17 @@ static struct platform_device_id s3c24xx_driver_ids[] = {
};
MODULE_DEVICE_TABLE(platform, s3c24xx_driver_ids);
#ifdef CONFIG_OF
static const struct of_device_id s3c24xx_i2c_match[] = {
{ .compatible = "samsung,s3c2410-i2c" },
{ .compatible = "samsung,s3c2440-i2c" },
{},
};
MODULE_DEVICE_TABLE(of, s3c24xx_i2c_match);
#else
#define s3c24xx_i2c_match NULL
#endif
static struct platform_driver s3c24xx_i2c_driver = {
.probe = s3c24xx_i2c_probe,
.remove = s3c24xx_i2c_remove,
@ -1020,6 +1131,7 @@ static struct platform_driver s3c24xx_i2c_driver = {
.owner = THIS_MODULE,
.name = "s3c-i2c",
.pm = S3C24XX_DEV_PM_OPS,
.of_match_table = s3c24xx_i2c_match,
},
};

2
drivers/i2c/busses/i2c-tegra.c
View File

@ -566,7 +566,7 @@ static int tegra_i2c_probe(struct platform_device *pdev)
struct clk *clk;
struct clk *i2c_clk;
const unsigned int *prop;
void *base;
void __iomem *base;
int irq;
int ret = 0;