i2c: S3C24XX I2C frequency scaling support.

Add support for CPU frequency scaling to the S3C24XX I2C driver.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>

1 files changed, 103 insertions, 13 deletions

diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index eef35d3f6073..4864723c7425 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -33,6 +33,7 @@
 #include <linux/err.h>
 #include <linux/platform_device.h>
 #include <linux/clk.h>
+#include <linux/cpufreq.h>
 
 #include <asm/hardware.h>
 #include <asm/irq.h>
@@ -64,6 +65,7 @@ struct s3c24xx_i2c {
         unsigned int            tx_setup;
 
         enum s3c24xx_i2c_state  state;
+        unsigned long           clkrate;
 
         void __iomem            *regs;
         struct clk              *clk;
@@ -71,6 +73,10 @@ struct s3c24xx_i2c {
         struct resource         *irq;
         struct resource         *ioarea;
         struct i2c_adapter      adap;
+
+#ifdef CONFIG_CPU_FREQ
+        struct notifier_block   freq_transition;
+#endif
 };
 
 /* default platform data to use if not supplied in the platform_device
@@ -501,6 +507,9 @@ static int s3c24xx_i2c_doxfer(struct s3c24xx_i2c *i2c, struct i2c_msg *msgs, int
         unsigned long timeout;
         int ret;
 
+        if (!readl(i2c->regs + S3C2410_IICCON) & S3C2410_IICCON_IRQEN)
+                return -EIO;
+
         ret = s3c24xx_i2c_set_master(i2c);
         if (ret != 0) {
                 dev_err(i2c->dev, "cannot get bus (error %d)\n", ret);
@@ -636,27 +645,28 @@ static inline int freq_acceptable(unsigned int freq, unsigned int wanted)
         return (diff >= -2 && diff <= 2);
 }
 
-/* s3c24xx_i2c_getdivisor
+/* s3c24xx_i2c_clockrate
  *
  * work out a divisor for the user requested frequency setting,
  * either by the requested frequency, or scanning the acceptable
  * range of frequencies until something is found
 */
 
-static int s3c24xx_i2c_getdivisor(struct s3c24xx_i2c *i2c,
-                                  struct s3c2410_platform_i2c *pdata,
-                                  unsigned long *iicon,
-                                  unsigned int *got)
+static int s3c24xx_i2c_clockrate(struct s3c24xx_i2c *i2c, unsigned int *got)
 {
+        struct s3c2410_platform_i2c *pdata;
         unsigned long clkin = clk_get_rate(i2c->clk);
-        
         unsigned int divs, div1;
+        u32 iiccon;
         int freq;
         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",
+        dev_dbg(i2c->dev, "pdata %p, freq %lu %lu..%lu\n",
                  pdata, pdata->bus_freq, pdata->min_freq, pdata->max_freq);
 
         if (pdata->bus_freq != 0) {
@@ -688,11 +698,79 @@ static int s3c24xx_i2c_getdivisor(struct s3c24xx_i2c *i2c,
 
  found:
         *got = freq;
-        *iicon |= (divs-1);
-        *iicon |= (div1 == 512) ? S3C2410_IICCON_TXDIV_512 : 0;
+
+        iiccon = readl(i2c->regs + S3C2410_IICCON);
+        iiccon &= ~(S3C2410_IICCON_SCALEMASK | S3C2410_IICCON_TXDIV_512);
+        iiccon |= (divs-1);
+
+        if (div1 == 512)
+                iiccon |= S3C2410_IICCON_TXDIV_512;
+
+        writel(iiccon, i2c->regs + S3C2410_IICCON);
+
+        return 0;
+}
+
+#ifdef CONFIG_CPU_FREQ
+
+#define freq_to_i2c(_n) container_of(_n, struct s3c24xx_i2c, freq_transition)
+
+static int s3c24xx_i2c_cpufreq_transition(struct notifier_block *nb,
+                                          unsigned long val, void *data)
+{
+        struct s3c24xx_i2c *i2c = freq_to_i2c(nb);
+        unsigned long flags;
+        unsigned int got;
+        int delta_f;
+        int ret;
+
+        delta_f = clk_get_rate(i2c->clk) - i2c->clkrate;
+
+        /* if we're post-change and the input clock has slowed down
+         * or at pre-change and the clock is about to speed up, then
+         * adjust our clock rate. <0 is slow, >0 speedup.
+         */
+
+        if ((val == CPUFREQ_POSTCHANGE && delta_f < 0) ||
+            (val == CPUFREQ_PRECHANGE && delta_f > 0)) {
+                spin_lock_irqsave(&i2c->lock, flags);
+                ret = s3c24xx_i2c_clockrate(i2c, &got);
+                spin_unlock_irqrestore(&i2c->lock, flags);
+
+                if (ret < 0)
+                        dev_err(i2c->dev, "cannot find frequency\n");
+                else
+                        dev_info(i2c->dev, "setting freq %d\n", got);
+        }
+
         return 0;
 }
 
+static inline int s3c24xx_i2c_register_cpufreq(struct s3c24xx_i2c *i2c)
+{
+        i2c->freq_transition.notifier_call = s3c24xx_i2c_cpufreq_transition;
+
+        return cpufreq_register_notifier(&i2c->freq_transition,
+                                         CPUFREQ_TRANSITION_NOTIFIER);
+}
+
+static inline void s3c24xx_i2c_deregister_cpufreq(struct s3c24xx_i2c *i2c)
+{
+        cpufreq_unregister_notifier(&i2c->freq_transition,
+                                    CPUFREQ_TRANSITION_NOTIFIER);
+}
+
+#else
+static inline int s3c24xx_i2c_register_cpufreq(struct s3c24xx_i2c *i2c)
+{
+        return 0;
+}
+
+static inline void s3c24xx_i2c_deregister_cpufreq(struct s3c24xx_i2c *i2c)
+{
+}
+#endif
+
 /* s3c24xx_i2c_init
  *
  * initialise the controller, set the IO lines and frequency 
@@ -719,9 +797,12 @@ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
 
         dev_info(i2c->dev, "slave address 0x%02x\n", pdata->slave_addr);
 
+        writel(iicon, i2c->regs + S3C2410_IICCON);
+
         /* we need to work out the divisors for the clock... */
 
-        if (s3c24xx_i2c_getdivisor(i2c, pdata, &iicon, &freq) != 0) {
+        if (s3c24xx_i2c_clockrate(i2c, &freq) != 0) {
+                writel(0, i2c->regs + S3C2410_IICCON);
                 dev_err(i2c->dev, "cannot meet bus frequency required\n");
                 return -EINVAL;
         }
@@ -730,8 +811,6 @@ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
 
         dev_info(i2c->dev, "bus frequency set to %d KHz\n", freq);
         dev_dbg(i2c->dev, "S3C2410_IICCON=0x%02lx\n", iicon);
-        
-        writel(iicon, i2c->regs + S3C2410_IICCON);
 
         /* check for s3c2440 i2c controller  */
 
@@ -835,6 +914,12 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
         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");
+                goto err_irq;
+        }
+
         /* Note, previous versions of the driver used i2c_add_adapter()
          * to add the bus at any number. We now pass the bus number via
          * the platform data, so if unset it will now default to always
@@ -846,7 +931,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
         ret = i2c_add_numbered_adapter(&i2c->adap);
         if (ret < 0) {
                 dev_err(&pdev->dev, "failed to add bus to i2c core\n");
-                goto err_irq;
+                goto err_cpufreq;
         }
 
         platform_set_drvdata(pdev, i2c);
@@ -854,6 +939,9 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
         dev_info(&pdev->dev, "%s: S3C I2C adapter\n", i2c->adap.dev.bus_id);
         return 0;
 
+ err_cpufreq:
+        s3c24xx_i2c_deregister_cpufreq(i2c);
+
  err_irq:
         free_irq(i2c->irq->start, i2c);
 
@@ -881,6 +969,8 @@ static int s3c24xx_i2c_remove(struct platform_device *pdev)
 {
         struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev);
 
+        s3c24xx_i2c_deregister_cpufreq(i2c);
+
         i2c_del_adapter(&i2c->adap);
         free_irq(i2c->irq->start, i2c);