mmc: access mxcmmc from mx31 boards

This patch modifies mxcmmc.c to be used
not only by i.MX27 but also by i.MX31 boards.
Both use the same SD controller, but have different
clock set-ups.
The i.MX27 imx_get_XXXclock functions are made static to
generic.c and a public mxc_get_clock() function
is provided.  Pins, base address and prototypes for
an i.MX31 specific board_init_mmc() are provided.
Some of the i.MX27 clock getters are unused and marked
as such to avoid warnings (./MAKEALL -s mx27), but
the code was left in for future use.

Signed-off-by: Helmut Raiger <helmut.raiger@hale.at>
Acked-by: Stefano Babic <sbabic@denx.de>

arch/arm/cpu/arm1136/mx31/generic.c

@@ -101,6 +101,7 @@ unsigned int mxc_get_clock(enum mxc_clock clk)
 	case MXC_IPG_PERCLK:
 	case MXC_CSPI_CLK:
 	case MXC_UART_CLK:
+	case MXC_ESDHC_CLK:
 		return mx31_get_ipg_clk();
 	case MXC_IPU_CLK:
 		return mx31_get_hsp_clk();

arch/arm/cpu/arm926ejs/mx27/generic.c

@@ -23,6 +23,7 @@
 #include <netdev.h>
 #include <asm/io.h>
 #include <asm/arch/imx-regs.h>
+#include <asm/arch/clock.h>
 #ifdef CONFIG_MXC_MMC
 #include <asm/arch/mxcmmc.h>
 #endif
@@ -34,7 +35,7 @@
  *  f = 2 * f_ref * --------------------
  *                        pd + 1
  */
-unsigned int imx_decode_pll(unsigned int pll, unsigned int f_ref)
+static unsigned int imx_decode_pll(unsigned int pll, unsigned int f_ref)
 {
 	unsigned int mfi = (pll >> 10) & 0xf;
 	unsigned int mfn = pll & 0x3ff;
@@ -64,7 +65,7 @@ static ulong clk_in_26m(void)
 	}
 }
 
-ulong imx_get_mpllclk(void)
+static ulong imx_get_mpllclk(void)
 {
 	struct pll_regs *pll = (struct pll_regs *)IMX_PLL_BASE;
 	ulong cscr = readl(&pll->cscr);
@@ -78,7 +79,7 @@ ulong imx_get_mpllclk(void)
 	return imx_decode_pll(readl(&pll->mpctl0), fref);
 }
 
-ulong imx_get_armclk(void)
+static ulong imx_get_armclk(void)
 {
 	struct pll_regs *pll = (struct pll_regs *)IMX_PLL_BASE;
 	ulong cscr = readl(&pll->cscr);
@@ -93,7 +94,7 @@ ulong imx_get_armclk(void)
 	return lldiv(fref, div);
 }
 
-ulong imx_get_ahbclk(void)
+static ulong imx_get_ahbclk(void)
 {
 	struct pll_regs *pll = (struct pll_regs *)IMX_PLL_BASE;
 	ulong cscr = readl(&pll->cscr);
@@ -105,7 +106,7 @@ ulong imx_get_ahbclk(void)
 	return lldiv(fref * 2, 3 * div);
 }
 
-ulong imx_get_spllclk(void)
+static __attribute__((unused)) ulong imx_get_spllclk(void)
 {
 	struct pll_regs *pll = (struct pll_regs *)IMX_PLL_BASE;
 	ulong cscr = readl(&pll->cscr);
@@ -124,34 +125,50 @@ static ulong imx_decode_perclk(ulong div)
 	return lldiv((imx_get_mpllclk() * 2), (div * 3));
 }
 
-ulong imx_get_perclk1(void)
+static ulong imx_get_perclk1(void)
 {
 	struct pll_regs *pll = (struct pll_regs *)IMX_PLL_BASE;
 
 	return imx_decode_perclk((readl(&pll->pcdr1) & 0x3f) + 1);
 }
 
-ulong imx_get_perclk2(void)
+static ulong imx_get_perclk2(void)
 {
 	struct pll_regs *pll = (struct pll_regs *)IMX_PLL_BASE;
 
 	return imx_decode_perclk(((readl(&pll->pcdr1) >> 8) & 0x3f) + 1);
 }
 
-ulong imx_get_perclk3(void)
+static __attribute__((unused)) ulong imx_get_perclk3(void)
 {
 	struct pll_regs *pll = (struct pll_regs *)IMX_PLL_BASE;
 
 	return imx_decode_perclk(((readl(&pll->pcdr1) >> 16) & 0x3f) + 1);
 }
 
-ulong imx_get_perclk4(void)
+static __attribute__((unused)) ulong imx_get_perclk4(void)
 {
 	struct pll_regs *pll = (struct pll_regs *)IMX_PLL_BASE;
 
 	return imx_decode_perclk(((readl(&pll->pcdr1) >> 24) & 0x3f) + 1);
 }
 
+unsigned int mxc_get_clock(enum mxc_clock clk)
+{
+	switch (clk) {
+	case MXC_ARM_CLK:
+		return imx_get_armclk();
+	case MXC_UART_CLK:
+		return imx_get_perclk1();
+	case MXC_FEC_CLK:
+		return imx_get_ahbclk();
+	case MXC_ESDHC_CLK:
+		return imx_get_perclk2();
+	}
+	return -1;
+}
+
+
 #if defined(CONFIG_DISPLAY_CPUINFO)
 int print_cpuinfo (void)
 {

arch/arm/include/asm/arch-mx27/clock.h

@@ -23,20 +23,16 @@
 
 #ifndef __ASM_ARCH_CLOCK_H
 #define __ASM_ARCH_CLOCK_H
-unsigned int imx_decode_pll(unsigned int pll, unsigned int f_ref);
 
-ulong imx_get_mpllclk(void);
-ulong imx_get_armclk(void);
-ulong imx_get_spllclk(void);
-ulong imx_get_fclk(void);
-ulong imx_get_hclk(void);
-ulong imx_get_bclk(void);
-ulong imx_get_perclk1(void);
-ulong imx_get_perclk2(void);
-ulong imx_get_perclk3(void);
-ulong imx_get_ahbclk(void);
+enum mxc_clock {
+	MXC_ARM_CLK,
+	MXC_UART_CLK,
+	MXC_ESDHC_CLK,
+	MXC_FEC_CLK,
+};
 
-#define imx_get_uartclk imx_get_perclk1
-#define imx_get_fecclk imx_get_ahbclk
+unsigned int mxc_get_clock(enum mxc_clock clk);
+#define imx_get_uartclk() mxc_get_clock(MXC_UART_CLK)
+#define imx_get_fecclk() mxc_get_clock(MXC_FEC_CLK)
 
 #endif /* __ASM_ARCH_CLOCK_H */

arch/arm/include/asm/arch-mx31/clock.h

@@ -30,7 +30,8 @@ enum mxc_clock {
 	MXC_IPG_PERCLK,
 	MXC_CSPI_CLK,
 	MXC_UART_CLK,
-	MXC_IPU_CLK
+	MXC_IPU_CLK,
+	MXC_ESDHC_CLK,
 };
 
 unsigned int mxc_get_clock(enum mxc_clock clk);

arch/arm/include/asm/arch-mx31/imx-regs.h

@@ -709,6 +709,13 @@ struct esdc_regs {
 #define MUX_CTL_CSPI3_SPI_RDY	0x0e
 #define MUX_CTL_CSPI3_MOSI		0x13
 
+#define MUX_CTL_SD1_DATA1	0x18
+#define MUX_CTL_SD1_DATA2	0x19
+#define MUX_CTL_SD1_DATA3	0x1a
+#define MUX_CTL_SD1_CMD		0x1d
+#define MUX_CTL_SD1_CLK		0x1e
+#define MUX_CTL_SD1_DATA0	0x1f
+
 #define MUX_CTL_USBH2_DATA1	0x40
 #define MUX_CTL_USBH2_DIR	0x44
 #define MUX_CTL_USBH2_STP	0x45
@@ -855,6 +862,10 @@ struct esdc_regs {
  */
 #define NFC_BASE_ADDR	0xB8000000
 
+/* SD card controller */
+#define SDHC1_BASE_ADDR	0x50004000
+#define SDHC2_BASE_ADDR	0x50008000
+
 /*
  * Internal RAM (16KB)
  */

arch/arm/include/asm/arch-mx31/sys_proto.h

@@ -31,5 +31,5 @@ struct mxc_weimcs {
 };
 
 void mxc_setup_weimcs(int cs, const struct mxc_weimcs *weimcs);
-
+int mxc_mmc_init(bd_t *bis);
 #endif

drivers/mmc/mxcmmc.c

@@ -25,9 +25,7 @@
 #include <mmc.h>
 #include <asm/errno.h>
 #include <asm/io.h>
-#ifdef CONFIG_MX27
 #include <asm/arch/clock.h>
-#endif
 
 #define DRIVER_NAME "mxc-mmc"
 
@@ -422,7 +420,7 @@ static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios)
 {
 	unsigned int divider;
 	int prescaler = 0;
-	unsigned long clk_in = imx_get_perclk2();
+	unsigned long clk_in = mxc_get_clock(MXC_ESDHC_CLK);
 
 	while (prescaler <= 0x800) {
 		for (divider = 1; divider <= 0xF; divider++) {
@@ -509,8 +507,8 @@ static int mxcmci_initialize(bd_t *bis)
 
 	mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
 
-	mmc->f_min = imx_get_perclk2() >> 7;
-	mmc->f_max = imx_get_perclk2() >> 1;
+	mmc->f_min = mxc_get_clock(MXC_ESDHC_CLK) >> 7;
+	mmc->f_max = mxc_get_clock(MXC_ESDHC_CLK) >> 1;
 
 	mmc->b_max = 0;