mmc: tmio: only access registers above 0xff, if available

Not all tmio implementations have registers above oxff. Accessing
them on thise platforms is dangerous. In some cases it leads to
address wrapping to addresses below 0x100, which corrupts random
unrelated registers.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c
index a7406e3701c9f16c83030e3a04771e4f6ab0ed0e..28e14c7a254087acfb8229850467b34ad25d00e8 100644 (file)
--- a/drivers/mmc/host/tmio_mmc_pio.c
+++ b/drivers/mmc/host/tmio_mmc_pio.c
@@ -209,6 +209,7 @@ static void tmio_mmc_set_clock(struct tmio_mmc_host *host, int new_clock)
 static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
 {
        struct tmio_mmc_data *pdata = host->pdata;
+       struct resource *res = platform_get_resource(host->pdev, IORESOURCE_MEM, 0);
 
        /*
         * Testing on sh-mobile showed that SDIO IRQs are unmasked when
@@ -218,8 +219,11 @@ static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
         */
        if (pdata->flags & TMIO_MMC_SDIO_IRQ)
                disable_irq(host->irq);
-       sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000);
-       msleep(10);
+       /* implicit BUG_ON(!res) */
+       if (resource_size(res) > 0x100) {
+               sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000);
+               msleep(10);
+       }
        if (pdata->flags & TMIO_MMC_SDIO_IRQ) {
                tmio_mmc_enable_sdio_irq(host->mmc, host->sdio_irq_enabled);
                enable_irq(host->irq);
@@ -232,6 +236,7 @@ static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
 static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
 {
        struct tmio_mmc_data *pdata = host->pdata;
+       struct resource *res = platform_get_resource(host->pdev, IORESOURCE_MEM, 0);
 
        sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, 0x0100 |
                sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
@@ -239,8 +244,11 @@ static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
        /* see comment in tmio_mmc_clk_stop above */
        if (pdata->flags & TMIO_MMC_SDIO_IRQ)
                disable_irq(host->irq);
-       sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100);
-       msleep(10);
+       /* implicit BUG_ON(!res) */
+       if (resource_size(res) > 0x100) {
+               sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100);
+               msleep(10);
+       }
        if (pdata->flags & TMIO_MMC_SDIO_IRQ) {
                tmio_mmc_enable_sdio_irq(host->mmc, host->sdio_irq_enabled);
                enable_irq(host->irq);
@@ -249,12 +257,17 @@ static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
 
 static void tmio_mmc_reset(struct tmio_mmc_host *host)
 {
+       struct resource *res = platform_get_resource(host->pdev, IORESOURCE_MEM, 0);
+
        /* FIXME - should we set stop clock reg here */
        sd_ctrl_write16(host, CTL_RESET_SD, 0x0000);
-       sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
+       /* implicit BUG_ON(!res) */
+       if (resource_size(res) > 0x100)
+               sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
        msleep(10);
        sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
-       sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
+       if (resource_size(res) > 0x100)
+               sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
        msleep(10);
 }