i.MX25: esdhc: Add mxc_get_clock infrastructure

Defining CONFIG_FSL_ESDHC brings in a call to get_clocks, so let's
implement get_clocks function. This is how it seems to be implemented
elsewhere.

Signed-off-by: Timo Ketola <timo@exertus.fi>
Acked-by: Stefano Babic <sbabic@denx.de>

arch/arm/cpu/arm926ejs/mx25/generic.c

@@ -28,10 +28,15 @@
 #include <asm/io.h>
 #include <asm/arch/imx-regs.h>
 #include <asm/arch/imx25-pinmux.h>
+#include <asm/arch/clock.h>
 #ifdef CONFIG_MXC_MMC
 #include <asm/arch/mxcmmc.h>
 #endif
 
+#ifdef CONFIG_FSL_ESDHC
+DECLARE_GLOBAL_DATA_PTR;
+#endif
+
 /*
  *  get the system pll clock in Hz
  *
@@ -105,6 +110,20 @@ ulong imx_get_perclk(int clk)
 	return lldiv(fref, div);
 }
 
+unsigned int mxc_get_clock(enum mxc_clock clk)
+{
+	if (clk >= MXC_CLK_NUM)
+		return -1;
+	switch (clk) {
+	case MXC_ARM_CLK:
+		return imx_get_armclk();
+	case MXC_FEC_CLK:
+		return imx_get_ahbclk();
+	default:
+		return imx_get_perclk(clk);
+	}
+}
+
 u32 get_cpu_rev(void)
 {
 	u32 srev;
@@ -182,6 +201,14 @@ int cpu_eth_init(bd_t *bis)
 #endif
 }
 
+int get_clocks(void)
+{
+#ifdef CONFIG_FSL_ESDHC
+	gd->sdhc_clk = mxc_get_clock(MXC_ESDHC_CLK);
+#endif
+	return 0;
+}
+
 /*
  * Initializes on-chip MMC controllers.
  * to override, implement board_mmc_init()

arch/arm/include/asm/arch-mx25/clock.h

@@ -26,11 +26,34 @@
 #ifndef __ASM_ARCH_CLOCK_H
 #define __ASM_ARCH_CLOCK_H
 
+enum mxc_clock {
+	MXC_CSI_CLK,
+	MXC_EPIT_CLK,
+	MXC_ESAI_CLK,
+	MXC_ESDHC1_CLK,
+	MXC_ESDHC2_CLK,
+	MXC_GPT_CLK,
+	MXC_I2C_CLK,
+	MXC_LCDC_CLK,
+	MXC_NFC_CLK,
+	MXC_OWIRE_CLK,
+	MXC_PWM_CLK,
+	MXC_SIM1_CLK,
+	MXC_SIM2_CLK,
+	MXC_SSI1_CLK,
+	MXC_SSI2_CLK,
+	MXC_UART_CLK,
+	MXC_ARM_CLK,
+	MXC_FEC_CLK,
+	MXC_CLK_NUM
+};
+
 ulong imx_get_perclk(int clk);
 ulong imx_get_ahbclk(void);
 
 #define imx_get_uartclk() imx_get_perclk(15)
 #define imx_get_fecclk() (imx_get_ahbclk()/2)
 
+unsigned int mxc_get_clock(enum mxc_clock clk);
 
 #endif /* __ASM_ARCH_CLOCK_H */