ARM: mxs: Add initial support for DENX MX28

Added initial support for DENX M28 module and M28EVK
board. Ethernet(FEC), SDHC, Display are supported.
Signed-off-by: Stefano Babic <sbabic@denx.de>
Reviewed-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/arm/configs/mxs_defconfig

@@ -26,6 +26,7 @@ CONFIG_MACH_MX23EVK=y
 CONFIG_MACH_MX28EVK=y
 CONFIG_MACH_STMP378X_DEVB=y
 CONFIG_MACH_TX28=y
+CONFIG_MACH_M28EVK=y
 # CONFIG_ARM_THUMB is not set
 CONFIG_NO_HZ=y
 CONFIG_HIGH_RES_TIMERS=y

arch/arm/mach-mxs/Kconfig

@@ -64,8 +64,25 @@ config MODULE_TX28
 	select MXS_HAVE_PLATFORM_MXS_MMC
 	select MXS_HAVE_PLATFORM_MXS_PWM
 
+config MODULE_M28
+	bool
+	select SOC_IMX28
+	select LEDS_GPIO_REGISTER
+	select MXS_HAVE_AMBA_DUART
+	select MXS_HAVE_PLATFORM_AUART
+	select MXS_HAVE_PLATFORM_FEC
+	select MXS_HAVE_PLATFORM_FLEXCAN
+	select MXS_HAVE_PLATFORM_MXS_I2C
+	select MXS_HAVE_PLATFORM_MXS_MMC
+	select MXS_HAVE_PLATFORM_MXSFB
+	select MXS_OCOTP
+
 config MACH_TX28
 	bool "Ka-Ro TX28 module"
 	select MODULE_TX28
 
+config MACH_M28EVK
+	bool "Support DENX M28EVK Platform"
+	select MODULE_M28
+
 endif

arch/arm/mach-mxs/Makefile

@@ -10,6 +10,7 @@ obj-$(CONFIG_SOC_IMX28) += clock-mx28.o mm-mx28.o
 obj-$(CONFIG_MACH_STMP378X_DEVB) += mach-stmp378x_devb.o
 obj-$(CONFIG_MACH_MX23EVK) += mach-mx23evk.o
 obj-$(CONFIG_MACH_MX28EVK) += mach-mx28evk.o
+obj-$(CONFIG_MACH_M28EVK)    += mach-m28evk.o
 obj-$(CONFIG_MODULE_TX28) += module-tx28.o
 obj-$(CONFIG_MACH_TX28)    += mach-tx28.o
 

arch/arm/mach-mxs/clock-mx28.c

@@ -738,11 +738,17 @@ static int clk_misc_init(void)
 	__raw_writel(BM_CLKCTRL_CPU_INTERRUPT_WAIT,
 			CLKCTRL_BASE_ADDR + HW_CLKCTRL_CPU_SET);
 
-	/* Extra fec clock setting */
-	reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_ENET);
-	reg &= ~BM_CLKCTRL_ENET_SLEEP;
-	reg |= BM_CLKCTRL_ENET_CLK_OUT_EN;
-	__raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_ENET);
+	/*
+	 * Extra fec clock setting
+	 * The DENX M28 uses an external clock source
+	 * and the clock output must not be enabled
+	 */
+	if (!machine_is_m28evk()) {
+		reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_ENET);
+		reg &= ~BM_CLKCTRL_ENET_SLEEP;
+		reg |= BM_CLKCTRL_ENET_CLK_OUT_EN;
+		__raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_ENET);
+	}
 
 	/*
 	 * 480 MHz seems too high to be ssp clock source directly,

arch/arm/mach-mxs/include/mach/mxs.h

@@ -33,6 +33,7 @@
 		0)
 #define cpu_is_mx28()		(					\
 		machine_is_mx28evk() ||					\
+		machine_is_m28evk() ||					\
 		machine_is_tx28() ||					\
 		0)
 

arch/arm/mach-mxs/include/mach/uncompress.h

@@ -63,6 +63,7 @@ static inline void __arch_decomp_setup(unsigned long arch_id)
 		mxs_duart_base = MX23_DUART_BASE_ADDR;
 		break;
 	case MACH_TYPE_MX28EVK:
+	case MACH_TYPE_M28EVK:
 	case MACH_TYPE_TX28:
 		mxs_duart_base = MX28_DUART_BASE_ADDR;
 		break;