Merge branch 'for-2.6.31' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6

[pandora-kernel.git] / drivers / i2c / busses / i2c-omap.c

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index ece0125..ad8d201 100644 (file)
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -333,8 +333,18 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
 
        if (cpu_is_omap2430() || cpu_is_omap34xx()) {
 
-               /* HSI2C controller internal clk rate should be 19.2 Mhz */
-               internal_clk = 19200;
+               /*
+                * HSI2C controller internal clk rate should be 19.2 Mhz for
+                * HS and for all modes on 2430. On 34xx we can use lower rate
+                * to get longer filter period for better noise suppression.
+                * The filter is iclk (fclk for HS) period.
+                */
+               if (dev->speed > 400 || cpu_is_omap2430())
+                       internal_clk = 19200;
+               else if (dev->speed > 100)
+                       internal_clk = 9600;
+               else
+                       internal_clk = 4000;
                fclk_rate = clk_get_rate(dev->fclk) / 1000;
 
                /* Compute prescaler divisor */
@@ -343,17 +353,28 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
 
                /* If configured for High Speed */
                if (dev->speed > 400) {
+                       unsigned long scl;
+
                        /* For first phase of HS mode */
-                       fsscll = internal_clk / (400 * 2) - 6;
-                       fssclh = internal_clk / (400 * 2) - 6;
+                       scl = internal_clk / 400;
+                       fsscll = scl - (scl / 3) - 7;
+                       fssclh = (scl / 3) - 5;
 
                        /* For second phase of HS mode */
-                       hsscll = fclk_rate / (dev->speed * 2) - 6;
-                       hssclh = fclk_rate / (dev->speed * 2) - 6;
+                       scl = fclk_rate / dev->speed;
+                       hsscll = scl - (scl / 3) - 7;
+                       hssclh = (scl / 3) - 5;
+               } else if (dev->speed > 100) {
+                       unsigned long scl;
+
+                       /* Fast mode */
+                       scl = internal_clk / dev->speed;
+                       fsscll = scl - (scl / 3) - 7;
+                       fssclh = (scl / 3) - 5;
                } else {
-                       /* To handle F/S modes */
-                       fsscll = internal_clk / (dev->speed * 2) - 6;
-                       fssclh = internal_clk / (dev->speed * 2) - 6;
+                       /* Standard mode */
+                       fsscll = internal_clk / (dev->speed * 2) - 7;
+                       fssclh = internal_clk / (dev->speed * 2) - 5;
                }
                scll = (hsscll << OMAP_I2C_SCLL_HSSCLL) | fsscll;
                sclh = (hssclh << OMAP_I2C_SCLH_HSSCLH) | fssclh;
@@ -807,7 +828,7 @@ omap_i2c_probe(struct platform_device *pdev)
        dev->idle = 1;
        dev->dev = &pdev->dev;
        dev->irq = irq->start;
-       dev->base = ioremap(mem->start, mem->end - mem->start + 1);
+       dev->base = ioremap(mem->start, resource_size(mem));
        if (!dev->base) {
                r = -ENOMEM;
                goto err_free_mem;