jz_mmc: Ensure the clock is activated for the MMC devices in use.

The clock for the MMC devices needs to be activated by clearing the corresponding bits in CLKGR0. It has so far only worked when booting from SD card because the bootrom leaves it cleared.

This fixes #1.

Signed-off-by: Kasper Fabæch Brandt <[email protected]>

Author: poizan42

drivers/mmc/jz_mmc.c

@@ -290,12 +290,15 @@ void jz_mmc_init(int clock_div)
 	int i = 0;
 
 #if defined(CONFIG_JZ_MMC_MSC0) && (!defined(CONFIG_SPL_BUILD) || (CONFIG_JZ_MMC_SPLMSC == 0))
+	writel(readl(CPM_CLKGR0) & ~CPM_CLKGR0_MSC0, CPM_CLKGR0);
 	jz_mmc_init_one(i++, 0, MSC0_BASE, clock_div);
 #endif
 #if defined(CONFIG_JZ_MMC_MSC1) && (!defined(CONFIG_SPL_BUILD) || (CONFIG_JZ_MMC_SPLMSC == 1))
+	writel(readl(CPM_CLKGR0) & ~CPM_CLKGR0_MSC1, CPM_CLKGR0);
 	jz_mmc_init_one(i++, 1, MSC1_BASE, clock_div);
 #endif
 #if defined(CONFIG_JZ_MMC_MSC2) && (!defined(CONFIG_SPL_BUILD) || (CONFIG_JZ_MMC_SPLMSC == 2))
+	writel(readl(CPM_CLKGR0) & ~CPM_CLKGR0_MSC2, CPM_CLKGR0);
 	jz_mmc_init_one(i++, 2, MSC2_BASE, clock_div);
 #endif
 }