sh: sh_mobile i2c clock framework support

[safe/jmp/linux-2.6] / drivers / i2c / busses / i2c-sh_mobile.c

diff --git a/drivers/i2c/busses/i2c-sh_mobile.c b/drivers/i2c/busses/i2c-sh_mobile.c
index 3384a71..6c3d60b 100644 (file)
--- a/drivers/i2c/busses/i2c-sh_mobile.c
+++ b/drivers/i2c/busses/i2c-sh_mobile.c
@@ -160,9 +160,39 @@ struct sh_mobile_i2c_data {
 
 static void activate_ch(struct sh_mobile_i2c_data *pd)
 {
+       unsigned long i2c_clk;
+       u_int32_t num;
+       u_int32_t denom;
+       u_int32_t tmp;
+
        /* Make sure the clock is enabled */
        clk_enable(pd->clk);
 
+       /* Get clock rate after clock is enabled */
+       i2c_clk = clk_get_rate(pd->clk);
+
+       /* Calculate the value for iccl. From the data sheet:
+        * iccl = (p clock / transfer rate) * (L / (L + H))
+        * where L and H are the SCL low/high ratio (5/4 in this case).
+        * We also round off the result.
+        */
+       num = i2c_clk * 5;
+       denom = NORMAL_SPEED * 9;
+       tmp = num * 10 / denom;
+       if (tmp % 10 >= 5)
+               pd->iccl = (u_int8_t)((num/denom) + 1);
+       else
+               pd->iccl = (u_int8_t)(num/denom);
+
+       /* Calculate the value for icch. From the data sheet:
+          icch = (p clock / transfer rate) * (H / (L + H)) */
+       num = i2c_clk * 4;
+       tmp = num * 10 / denom;
+       if (tmp % 10 >= 5)
+               pd->icch = (u_int8_t)((num/denom) + 1);
+       else
+               pd->icch = (u_int8_t)(num/denom);
+
        /* Enable channel and configure rx ack */
        iowrite8(ioread8(ICCR(pd)) | ICCR_ICE, ICCR(pd));
 
@@ -459,40 +489,6 @@ static struct i2c_algorithm sh_mobile_i2c_algorithm = {
        .master_xfer    = sh_mobile_i2c_xfer,
 };
 
-static void sh_mobile_i2c_setup_channel(struct platform_device *dev)
-{
-       struct sh_mobile_i2c_data *pd = platform_get_drvdata(dev);
-       unsigned long peripheral_clk = clk_get_rate(pd->clk);
-       u_int32_t num;
-       u_int32_t denom;
-       u_int32_t tmp;
-
-       spin_lock_init(&pd->lock);
-       init_waitqueue_head(&pd->wait);
-
-       /* Calculate the value for iccl. From the data sheet:
-        * iccl = (p clock / transfer rate) * (L / (L + H))
-        * where L and H are the SCL low/high ratio (5/4 in this case).
-        * We also round off the result.
-        */
-       num = peripheral_clk * 5;
-       denom = NORMAL_SPEED * 9;
-       tmp = num * 10 / denom;
-       if (tmp % 10 >= 5)
-               pd->iccl = (u_int8_t)((num/denom) + 1);
-       else
-               pd->iccl = (u_int8_t)(num/denom);
-
-       /* Calculate the value for icch. From the data sheet:
-          icch = (p clock / transfer rate) * (H / (L + H)) */
-       num = peripheral_clk * 4;
-       tmp = num * 10 / denom;
-       if (tmp % 10 >= 5)
-               pd->icch = (u_int8_t)((num/denom) + 1);
-       else
-               pd->icch = (u_int8_t)(num/denom);
-}
-
 static int sh_mobile_i2c_hook_irqs(struct platform_device *dev, int hook)
 {
        struct resource *res;
@@ -533,6 +529,7 @@ static int sh_mobile_i2c_probe(struct platform_device *dev)
        struct sh_mobile_i2c_data *pd;
        struct i2c_adapter *adap;
        struct resource *res;
+       char clk_name[8];
        int size;
        int ret;
 
@@ -542,9 +539,10 @@ static int sh_mobile_i2c_probe(struct platform_device *dev)
                return -ENOMEM;
        }
 
-       pd->clk = clk_get(&dev->dev, "peripheral_clk");
+       snprintf(clk_name, sizeof(clk_name), "i2c%d", dev->id);
+       pd->clk = clk_get(&dev->dev, clk_name);
        if (IS_ERR(pd->clk)) {
-               dev_err(&dev->dev, "cannot get peripheral clock\n");
+               dev_err(&dev->dev, "cannot get clock \"%s\"\n", clk_name);
                ret = PTR_ERR(pd->clk);
                goto err;
        }
@@ -586,7 +584,8 @@ static int sh_mobile_i2c_probe(struct platform_device *dev)
 
        strlcpy(adap->name, dev->name, sizeof(adap->name));
 
-       sh_mobile_i2c_setup_channel(dev);
+       spin_lock_init(&pd->lock);
+       init_waitqueue_head(&pd->wait);
 
        ret = i2c_add_numbered_adapter(adap);
        if (ret < 0) {