[ARM] pxa: update PXA MMC interface driver to use clk support

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 36 insertions, 7 deletions

diff --git a/drivers/mmc/host/pxamci.c b/drivers/mmc/host/pxamci.c
index 657901eecfce..0601e01aa2c2 100644
--- a/drivers/mmc/host/pxamci.c
+++ b/drivers/mmc/host/pxamci.c
@@ -23,6 +23,8 @@
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/dma-mapping.h>
+#include <linux/clk.h>
+#include <linux/err.h>
 #include <linux/mmc/host.h>
 
 #include <asm/dma.h>
@@ -44,6 +46,8 @@ struct pxamci_host {
         spinlock_t              lock;
         struct resource         *res;
         void __iomem            *base;
+        struct clk              *clk;
+        unsigned long           clkrate;
         int                     irq;
         int                     dma;
         unsigned int            clkrt;
@@ -119,7 +123,7 @@ static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
         writel(nob, host->base + MMC_NOB);
         writel(data->blksz, host->base + MMC_BLKLEN);
 
-        clks = (unsigned long long)data->timeout_ns * CLOCKRATE;
+        clks = (unsigned long long)data->timeout_ns * host->clkrate;
         do_div(clks, 1000000000UL);
         timeout = (unsigned int)clks + (data->timeout_clks << host->clkrt);
         writel((timeout + 255) / 256, host->base + MMC_RDTO);
@@ -365,18 +369,25 @@ static void pxamci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
         struct pxamci_host *host = mmc_priv(mmc);
 
         if (ios->clock) {
-                unsigned int clk = CLOCKRATE / ios->clock;
-                if (CLOCKRATE / clk > ios->clock)
+                unsigned long rate = host->clkrate;
+                unsigned int clk = rate / ios->clock;
+
+                /*
+                 * clk might result in a lower divisor than we
+                 * desire.  check for that condition and adjust
+                 * as appropriate.
+                 */
+                if (rate / clk > ios->clock)
                         clk <<= 1;
                 host->clkrt = fls(clk) - 1;
-                pxa_set_cken(CKEN_MMC, 1);
+                clk_enable(host->clk);
 
                 /*
                  * we write clkrt on the next command
                  */
         } else {
                 pxamci_stop_clock(host);
-                pxa_set_cken(CKEN_MMC, 0);
+                clk_disable(host->clk);
         }
 
         if (host->power_mode != ios->power_mode) {
@@ -462,8 +473,6 @@ static int pxamci_probe(struct platform_device *pdev)
         }
 
         mmc->ops = &pxamci_ops;
-        mmc->f_min = CLOCKRATE_MIN;
-        mmc->f_max = CLOCKRATE_MAX;
 
         /*
          * We can do SG-DMA, but we don't because we never know how much
@@ -490,6 +499,22 @@ static int pxamci_probe(struct platform_device *pdev)
         host->mmc = mmc;
         host->dma = -1;
         host->pdata = pdev->dev.platform_data;
+
+        host->clk = clk_get(&pdev->dev, "MMCCLK");
+        if (IS_ERR(host->clk)) {
+                ret = PTR_ERR(host->clk);
+                host->clk = NULL;
+                goto out;
+        }
+
+        host->clkrate = clk_get_rate(host->clk);
+
+        /*
+         * Calculate minimum clock rate, rounding up.
+         */
+        mmc->f_min = (host->clkrate + 63) / 64;
+        mmc->f_max = host->clkrate;
+
         mmc->ocr_avail = host->pdata ?
                          host->pdata->ocr_mask :
                          MMC_VDD_32_33|MMC_VDD_33_34;
@@ -554,6 +579,8 @@ static int pxamci_probe(struct platform_device *pdev)
                         iounmap(host->base);
                 if (host->sg_cpu)
                         dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
+                if (host->clk)
+                        clk_put(host->clk);
         }
         if (mmc)
                 mmc_free_host(mmc);
@@ -588,6 +615,8 @@ static int pxamci_remove(struct platform_device *pdev)
                 iounmap(host->base);
                 dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
 
+                clk_put(host->clk);
+
                 release_resource(host->res);
 
                 mmc_free_host(mmc);