ARM: Orion: SDIO: Add support for clk.

Some orion devices can gate the SDIO clock. If the clock exists,
enable/disable it as appropriate.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Jamie Lentin <jm@lentin.co.uk>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

diff --git a/arch/arm/mach-kirkwood/common.c b/arch/arm/mach-kirkwood/common.c
index 99adebc..88a1667 100644 (file)
--- a/arch/arm/mach-kirkwood/common.c
+++ b/arch/arm/mach-kirkwood/common.c
@@ -86,7 +86,7 @@ static struct clk __init *kirkwood_register_gate(const char *name, u8 bit_idx)
 
 void __init kirkwood_clk_init(void)
 {
-       struct clk *runit, *ge0, *ge1, *sata0, *sata1, *usb0;
+       struct clk *runit, *ge0, *ge1, *sata0, *sata1, *usb0, *sdio;
 
        tclk = clk_register_fixed_rate(NULL, "tclk", NULL,
                                       CLK_IS_ROOT, kirkwood_tclk);
@@ -97,7 +97,7 @@ void __init kirkwood_clk_init(void)
        sata0 = kirkwood_register_gate("sata0",  CGC_BIT_SATA0);
        sata1 = kirkwood_register_gate("sata1",  CGC_BIT_SATA1);
        usb0 = kirkwood_register_gate("usb0",   CGC_BIT_USB0);
-       kirkwood_register_gate("sdio",   CGC_BIT_SDIO);
+       sdio = kirkwood_register_gate("sdio",   CGC_BIT_SDIO);
        kirkwood_register_gate("crypto", CGC_BIT_CRYPTO);
        kirkwood_register_gate("xor0",   CGC_BIT_XOR0);
        kirkwood_register_gate("xor1",   CGC_BIT_XOR1);
@@ -117,6 +117,7 @@ void __init kirkwood_clk_init(void)
        orion_clkdev_add("1", "sata_mv.0", sata1);
        orion_clkdev_add(NULL, "orion-ehci.0", usb0);
        orion_clkdev_add(NULL, "orion_nand", runit);
+       orion_clkdev_add(NULL, "mvsdio", sdio);
 }
 
 /*****************************************************************************

diff --git a/drivers/mmc/host/mvsdio.c b/drivers/mmc/host/mvsdio.c
index eeb8cd1..3b9136c 100644 (file)
--- a/drivers/mmc/host/mvsdio.c
+++ b/drivers/mmc/host/mvsdio.c
@@ -19,6 +19,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/scatterlist.h>
 #include <linux/irq.h>
+#include <linux/clk.h>
 #include <linux/gpio.h>
 #include <linux/mmc/host.h>
 
@@ -51,6 +52,7 @@ struct mvsd_host {
        struct device *dev;
        struct resource *res;
        int irq;
+       struct clk *clk;
        int gpio_card_detect;
        int gpio_write_protect;
 };
@@ -770,6 +772,13 @@ static int __init mvsd_probe(struct platform_device *pdev)
        } else
                host->irq = irq;
 
+       /* Not all platforms can gate the clock, so it is not
+          an error if the clock does not exists. */
+       host->clk = clk_get(&pdev->dev, NULL);
+       if (!IS_ERR(host->clk)) {
+               clk_prepare_enable(host->clk);
+       }
+
        if (mvsd_data->gpio_card_detect) {
                ret = gpio_request(mvsd_data->gpio_card_detect,
                                   DRIVER_NAME " cd");
@@ -854,6 +863,11 @@ static int __exit mvsd_remove(struct platform_device *pdev)
                mvsd_power_down(host);
                iounmap(host->base);
                release_resource(host->res);
+
+               if (!IS_ERR(host->clk)) {
+                       clk_disable_unprepare(host->clk);
+                       clk_put(host->clk);
+               }
                mmc_free_host(mmc);
        }
        platform_set_drvdata(pdev, NULL);