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-rw-r--r--drivers/i2c/busses/i2c-s3c2410.c185
1 files changed, 78 insertions, 107 deletions
diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index 1fac4e23313..2a0de645ccf 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -35,11 +35,9 @@
#include <linux/clk.h>
#include <linux/cpufreq.h>
-#include <mach/hardware.h>
#include <asm/irq.h>
#include <asm/io.h>
-#include <mach/regs-gpio.h>
#include <asm/plat-s3c/regs-iic.h>
#include <asm/plat-s3c/iic.h>
@@ -63,6 +61,7 @@ struct s3c24xx_i2c {
unsigned int msg_ptr;
unsigned int tx_setup;
+ unsigned int irq;
enum s3c24xx_i2c_state state;
unsigned long clkrate;
@@ -70,7 +69,6 @@ struct s3c24xx_i2c {
void __iomem *regs;
struct clk *clk;
struct device *dev;
- struct resource *irq;
struct resource *ioarea;
struct i2c_adapter adap;
@@ -79,16 +77,7 @@ struct s3c24xx_i2c {
#endif
};
-/* default platform data to use if not supplied in the platform_device
-*/
-
-static struct s3c2410_platform_i2c s3c24xx_i2c_default_platform = {
- .flags = 0,
- .slave_addr = 0x10,
- .bus_freq = 100*1000,
- .max_freq = 400*1000,
- .sda_delay = S3C2410_IICLC_SDA_DELAY5 | S3C2410_IICLC_FILTER_ON,
-};
+/* default platform data removed, dev should always carry data. */
/* s3c24xx_i2c_is2440()
*
@@ -102,21 +91,6 @@ static inline int s3c24xx_i2c_is2440(struct s3c24xx_i2c *i2c)
return !strcmp(pdev->name, "s3c2440-i2c");
}
-
-/* s3c24xx_i2c_get_platformdata
- *
- * get the platform data associated with the given device, or return
- * the default if there is none
-*/
-
-static inline struct s3c2410_platform_i2c *s3c24xx_i2c_get_platformdata(struct device *dev)
-{
- if (dev->platform_data != NULL)
- return (struct s3c2410_platform_i2c *)dev->platform_data;
-
- return &s3c24xx_i2c_default_platform;
-}
-
/* s3c24xx_i2c_master_complete
*
* complete the message and wake up the caller, using the given return code,
@@ -129,7 +103,7 @@ static inline void s3c24xx_i2c_master_complete(struct s3c24xx_i2c *i2c, int ret)
i2c->msg_ptr = 0;
i2c->msg = NULL;
- i2c->msg_idx ++;
+ i2c->msg_idx++;
i2c->msg_num = 0;
if (ret)
i2c->msg_idx = ret;
@@ -140,19 +114,17 @@ static inline void s3c24xx_i2c_master_complete(struct s3c24xx_i2c *i2c, int ret)
static inline void s3c24xx_i2c_disable_ack(struct s3c24xx_i2c *i2c)
{
unsigned long tmp;
-
+
tmp = readl(i2c->regs + S3C2410_IICCON);
writel(tmp & ~S3C2410_IICCON_ACKEN, i2c->regs + S3C2410_IICCON);
-
}
static inline void s3c24xx_i2c_enable_ack(struct s3c24xx_i2c *i2c)
{
unsigned long tmp;
-
+
tmp = readl(i2c->regs + S3C2410_IICCON);
writel(tmp | S3C2410_IICCON_ACKEN, i2c->regs + S3C2410_IICCON);
-
}
/* irq enable/disable functions */
@@ -160,7 +132,7 @@ static inline void s3c24xx_i2c_enable_ack(struct s3c24xx_i2c *i2c)
static inline void s3c24xx_i2c_disable_irq(struct s3c24xx_i2c *i2c)
{
unsigned long tmp;
-
+
tmp = readl(i2c->regs + S3C2410_IICCON);
writel(tmp & ~S3C2410_IICCON_IRQEN, i2c->regs + S3C2410_IICCON);
}
@@ -168,7 +140,7 @@ static inline void s3c24xx_i2c_disable_irq(struct s3c24xx_i2c *i2c)
static inline void s3c24xx_i2c_enable_irq(struct s3c24xx_i2c *i2c)
{
unsigned long tmp;
-
+
tmp = readl(i2c->regs + S3C2410_IICCON);
writel(tmp | S3C2410_IICCON_IRQEN, i2c->regs + S3C2410_IICCON);
}
@@ -176,10 +148,10 @@ static inline void s3c24xx_i2c_enable_irq(struct s3c24xx_i2c *i2c)
/* s3c24xx_i2c_message_start
*
- * put the start of a message onto the bus
+ * put the start of a message onto the bus
*/
-static void s3c24xx_i2c_message_start(struct s3c24xx_i2c *i2c,
+static void s3c24xx_i2c_message_start(struct s3c24xx_i2c *i2c,
struct i2c_msg *msg)
{
unsigned int addr = (msg->addr & 0x7f) << 1;
@@ -198,15 +170,15 @@ static void s3c24xx_i2c_message_start(struct s3c24xx_i2c *i2c,
if (msg->flags & I2C_M_REV_DIR_ADDR)
addr ^= 1;
- // todo - check for wether ack wanted or not
+ /* todo - check for wether ack wanted or not */
s3c24xx_i2c_enable_ack(i2c);
iiccon = readl(i2c->regs + S3C2410_IICCON);
writel(stat, i2c->regs + S3C2410_IICSTAT);
-
+
dev_dbg(i2c->dev, "START: %08lx to IICSTAT, %02x to DS\n", stat, addr);
writeb(addr, i2c->regs + S3C2410_IICDS);
-
+
/* delay here to ensure the data byte has gotten onto the bus
* before the transaction is started */
@@ -214,8 +186,8 @@ static void s3c24xx_i2c_message_start(struct s3c24xx_i2c *i2c,
dev_dbg(i2c->dev, "iiccon, %08lx\n", iiccon);
writel(iiccon, i2c->regs + S3C2410_IICCON);
-
- stat |= S3C2410_IICSTAT_START;
+
+ stat |= S3C2410_IICSTAT_START;
writel(stat, i2c->regs + S3C2410_IICSTAT);
}
@@ -226,11 +198,11 @@ static inline void s3c24xx_i2c_stop(struct s3c24xx_i2c *i2c, int ret)
dev_dbg(i2c->dev, "STOP\n");
/* stop the transfer */
- iicstat &= ~ S3C2410_IICSTAT_START;
+ iicstat &= ~S3C2410_IICSTAT_START;
writel(iicstat, i2c->regs + S3C2410_IICSTAT);
-
+
i2c->state = STATE_STOP;
-
+
s3c24xx_i2c_master_complete(i2c, ret);
s3c24xx_i2c_disable_irq(i2c);
}
@@ -240,7 +212,7 @@ static inline void s3c24xx_i2c_stop(struct s3c24xx_i2c *i2c, int ret)
/* is_lastmsg()
*
- * returns TRUE if the current message is the last in the set
+ * returns TRUE if the current message is the last in the set
*/
static inline int is_lastmsg(struct s3c24xx_i2c *i2c)
@@ -288,14 +260,14 @@ static int i2s_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat)
case STATE_STOP:
dev_err(i2c->dev, "%s: called in STATE_STOP\n", __func__);
- s3c24xx_i2c_disable_irq(i2c);
+ s3c24xx_i2c_disable_irq(i2c);
goto out_ack;
case STATE_START:
/* last thing we did was send a start condition on the
* bus, or started a new i2c message
*/
-
+
if (iicstat & S3C2410_IICSTAT_LASTBIT &&
!(i2c->msg->flags & I2C_M_IGNORE_NAK)) {
/* ack was not received... */
@@ -321,7 +293,7 @@ static int i2s_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat)
if (i2c->state == STATE_READ)
goto prepare_read;
- /* fall through to the write state, as we will need to
+ /* fall through to the write state, as we will need to
* send a byte as well */
case STATE_WRITE:
@@ -338,7 +310,7 @@ static int i2s_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat)
}
}
- retry_write:
+ retry_write:
if (!is_msgend(i2c)) {
byte = i2c->msg->buf[i2c->msg_ptr++];
@@ -358,9 +330,9 @@ static int i2s_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat)
dev_dbg(i2c->dev, "WRITE: Next Message\n");
i2c->msg_ptr = 0;
- i2c->msg_idx ++;
+ i2c->msg_idx++;
i2c->msg++;
-
+
/* check to see if we need to do another message */
if (i2c->msg->flags & I2C_M_NOSTART) {
@@ -374,7 +346,6 @@ static int i2s_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat)
goto retry_write;
} else {
-
/* send the new start */
s3c24xx_i2c_message_start(i2c, i2c->msg);
i2c->state = STATE_START;
@@ -388,7 +359,7 @@ static int i2s_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat)
break;
case STATE_READ:
- /* we have a byte of data in the data register, do
+ /* we have a byte of data in the data register, do
* something with it, and then work out wether we are
* going to do any more read/write
*/
@@ -396,13 +367,13 @@ static int i2s_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat)
byte = readb(i2c->regs + S3C2410_IICDS);
i2c->msg->buf[i2c->msg_ptr++] = byte;
- prepare_read:
+ prepare_read:
if (is_msglast(i2c)) {
/* last byte of buffer */
if (is_lastmsg(i2c))
s3c24xx_i2c_disable_ack(i2c);
-
+
} else if (is_msgend(i2c)) {
/* ok, we've read the entire buffer, see if there
* is anything else we need to do */
@@ -428,7 +399,7 @@ static int i2s_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat)
/* acknowlegde the IRQ and get back on with the work */
out_ack:
- tmp = readl(i2c->regs + S3C2410_IICCON);
+ tmp = readl(i2c->regs + S3C2410_IICCON);
tmp &= ~S3C2410_IICCON_IRQPEND;
writel(tmp, i2c->regs + S3C2410_IICCON);
out:
@@ -449,19 +420,19 @@ static irqreturn_t s3c24xx_i2c_irq(int irqno, void *dev_id)
status = readl(i2c->regs + S3C2410_IICSTAT);
if (status & S3C2410_IICSTAT_ARBITR) {
- // deal with arbitration loss
+ /* deal with arbitration loss */
dev_err(i2c->dev, "deal with arbitration loss\n");
}
if (i2c->state == STATE_IDLE) {
dev_dbg(i2c->dev, "IRQ: error i2c->state == IDLE\n");
- tmp = readl(i2c->regs + S3C2410_IICCON);
+ tmp = readl(i2c->regs + S3C2410_IICCON);
tmp &= ~S3C2410_IICCON_IRQPEND;
writel(tmp, i2c->regs + S3C2410_IICCON);
goto out;
}
-
+
/* pretty much this leaves us with the fact that we've
* transmitted or received whatever byte we last sent */
@@ -484,16 +455,13 @@ static int s3c24xx_i2c_set_master(struct s3c24xx_i2c *i2c)
while (timeout-- > 0) {
iicstat = readl(i2c->regs + S3C2410_IICSTAT);
-
+
if (!(iicstat & S3C2410_IICSTAT_BUSBUSY))
return 0;
msleep(1);
}
- dev_dbg(i2c->dev, "timeout: GPEDAT is %08x\n",
- __raw_readl(S3C2410_GPEDAT));
-
return -ETIMEDOUT;
}
@@ -502,7 +470,8 @@ static int s3c24xx_i2c_set_master(struct s3c24xx_i2c *i2c)
* this starts an i2c transfer
*/
-static int s3c24xx_i2c_doxfer(struct s3c24xx_i2c *i2c, struct i2c_msg *msgs, int num)
+static int s3c24xx_i2c_doxfer(struct s3c24xx_i2c *i2c,
+ struct i2c_msg *msgs, int num)
{
unsigned long timeout;
int ret;
@@ -528,12 +497,12 @@ static int s3c24xx_i2c_doxfer(struct s3c24xx_i2c *i2c, struct i2c_msg *msgs, int
s3c24xx_i2c_enable_irq(i2c);
s3c24xx_i2c_message_start(i2c, msgs);
spin_unlock_irq(&i2c->lock);
-
+
timeout = wait_event_timeout(i2c->wait, i2c->msg_num == 0, HZ * 5);
ret = i2c->msg_idx;
- /* having these next two as dev_err() makes life very
+ /* having these next two as dev_err() makes life very
* noisy when doing an i2cdetect */
if (timeout == 0)
@@ -590,19 +559,6 @@ static const struct i2c_algorithm s3c24xx_i2c_algorithm = {
.functionality = s3c24xx_i2c_func,
};
-static struct s3c24xx_i2c s3c24xx_i2c = {
- .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_i2c.lock),
- .wait = __WAIT_QUEUE_HEAD_INITIALIZER(s3c24xx_i2c.wait),
- .tx_setup = 50,
- .adap = {
- .name = "s3c2410-i2c",
- .owner = THIS_MODULE,
- .algo = &s3c24xx_i2c_algorithm,
- .retries = 2,
- .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
- },
-};
-
/* s3c24xx_i2c_calcdivisor
*
* return the divisor settings for a given frequency
@@ -642,7 +598,7 @@ static inline int freq_acceptable(unsigned int freq, unsigned int wanted)
{
int diff = freq - wanted;
- return (diff >= -2 && diff <= 2);
+ return diff >= -2 && diff <= 2;
}
/* s3c24xx_i2c_clockrate
@@ -654,7 +610,7 @@ static inline int freq_acceptable(unsigned int freq, unsigned int wanted)
static int s3c24xx_i2c_clockrate(struct s3c24xx_i2c *i2c, unsigned int *got)
{
- struct s3c2410_platform_i2c *pdata;
+ struct s3c2410_platform_i2c *pdata = i2c->dev->platform_data;
unsigned long clkin = clk_get_rate(i2c->clk);
unsigned int divs, div1;
u32 iiccon;
@@ -662,10 +618,8 @@ static int s3c24xx_i2c_clockrate(struct s3c24xx_i2c *i2c, unsigned int *got)
int start, end;
i2c->clkrate = clkin;
-
- pdata = s3c24xx_i2c_get_platformdata(i2c->adap.dev.parent);
clkin /= 1000; /* clkin now in KHz */
-
+
dev_dbg(i2c->dev, "pdata %p, freq %lu %lu..%lu\n",
pdata, pdata->bus_freq, pdata->min_freq, pdata->max_freq);
@@ -773,7 +727,7 @@ static inline void s3c24xx_i2c_deregister_cpufreq(struct s3c24xx_i2c *i2c)
/* s3c24xx_i2c_init
*
- * initialise the controller, set the IO lines and frequency
+ * initialise the controller, set the IO lines and frequency
*/
static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
@@ -784,15 +738,15 @@ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
/* get the plafrom data */
- pdata = s3c24xx_i2c_get_platformdata(i2c->adap.dev.parent);
+ pdata = i2c->dev->platform_data;
/* inititalise the gpio */
- s3c2410_gpio_cfgpin(S3C2410_GPE15, S3C2410_GPE15_IICSDA);
- s3c2410_gpio_cfgpin(S3C2410_GPE14, S3C2410_GPE14_IICSCL);
+ if (pdata->cfg_gpio)
+ pdata->cfg_gpio(to_platform_device(i2c->dev));
/* write slave address */
-
+
writeb(pdata->slave_addr, i2c->regs + S3C2410_IICADD);
dev_info(i2c->dev, "slave address 0x%02x\n", pdata->slave_addr);
@@ -830,12 +784,32 @@ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
static int s3c24xx_i2c_probe(struct platform_device *pdev)
{
- struct s3c24xx_i2c *i2c = &s3c24xx_i2c;
+ struct s3c24xx_i2c *i2c;
struct s3c2410_platform_i2c *pdata;
struct resource *res;
int ret;
- pdata = s3c24xx_i2c_get_platformdata(&pdev->dev);
+ 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);
+ if (!i2c) {
+ dev_err(&pdev->dev, "no memory for state\n");
+ return -ENOMEM;
+ }
+
+ strlcpy(i2c->adap.name, "s3c2410-i2c", sizeof(i2c->adap.name));
+ i2c->adap.owner = THIS_MODULE;
+ i2c->adap.algo = &s3c24xx_i2c_algorithm;
+ i2c->adap.retries = 2;
+ i2c->adap.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
+ i2c->tx_setup = 50;
+
+ spin_lock_init(&i2c->lock);
+ init_waitqueue_head(&i2c->wait);
/* find the clock and enable it */
@@ -877,7 +851,8 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
goto err_ioarea;
}
- dev_dbg(&pdev->dev, "registers %p (%p, %p)\n", i2c->regs, i2c->ioarea, res);
+ dev_dbg(&pdev->dev, "registers %p (%p, %p)\n",
+ i2c->regs, i2c->ioarea, res);
/* setup info block for the i2c core */
@@ -891,29 +866,23 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
goto err_iomap;
/* find the IRQ for this unit (note, this relies on the init call to
- * ensure no current IRQs pending
+ * ensure no current IRQs pending
*/
- res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
- if (res == NULL) {
+ i2c->irq = ret = platform_get_irq(pdev, 0);
+ if (ret <= 0) {
dev_err(&pdev->dev, "cannot find IRQ\n");
- ret = -ENOENT;
goto err_iomap;
}
- ret = request_irq(res->start, s3c24xx_i2c_irq, IRQF_DISABLED,
- pdev->name, i2c);
+ ret = request_irq(i2c->irq, s3c24xx_i2c_irq, IRQF_DISABLED,
+ dev_name(&pdev->dev), i2c);
if (ret != 0) {
- dev_err(&pdev->dev, "cannot claim IRQ\n");
+ dev_err(&pdev->dev, "cannot claim IRQ %d\n", i2c->irq);
goto err_iomap;
}
- i2c->irq = res;
-
- dev_dbg(&pdev->dev, "irq resource %p (%lu)\n", res,
- (unsigned long)res->start);
-
ret = s3c24xx_i2c_register_cpufreq(i2c);
if (ret < 0) {
dev_err(&pdev->dev, "failed to register cpufreq notifier\n");
@@ -943,7 +912,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
s3c24xx_i2c_deregister_cpufreq(i2c);
err_irq:
- free_irq(i2c->irq->start, i2c);
+ free_irq(i2c->irq, i2c);
err_iomap:
iounmap(i2c->regs);
@@ -957,6 +926,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
clk_put(i2c->clk);
err_noclk:
+ kfree(i2c);
return ret;
}
@@ -972,7 +942,7 @@ static int s3c24xx_i2c_remove(struct platform_device *pdev)
s3c24xx_i2c_deregister_cpufreq(i2c);
i2c_del_adapter(&i2c->adap);
- free_irq(i2c->irq->start, i2c);
+ free_irq(i2c->irq, i2c);
clk_disable(i2c->clk);
clk_put(i2c->clk);
@@ -981,6 +951,7 @@ static int s3c24xx_i2c_remove(struct platform_device *pdev)
release_resource(i2c->ioarea);
kfree(i2c->ioarea);
+ kfree(i2c);
return 0;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-30 17:20:05 +0000