mx6sabresd: Add SPI NOR support

mx6sabre board has a m25p32 SPI NOR connected to ECSPI1 port.

Add support for it.

This patch allows the SPI NOR flash to be succesfully detected:

=> sf probe
SF: Detected M25P32 with page size 256 Bytes, erase size 64 KiB, total 4 MiB

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>

board/freescale/mx6sabresd/mx6sabresd.c

@@ -37,6 +37,9 @@ DECLARE_GLOBAL_DATA_PTR;
 #define ENET_PAD_CTRL  (PAD_CTL_PUS_100K_UP |			\
 	PAD_CTL_SPEED_MED | PAD_CTL_DSE_40ohm | PAD_CTL_HYS)
 
+#define SPI_PAD_CTRL (PAD_CTL_HYS | PAD_CTL_SPEED_MED | \
+		      PAD_CTL_DSE_40ohm | PAD_CTL_SRE_FAST)
+
 int dram_init(void)
 {
 	gd->ram_size = get_ram_size((void *)PHYS_SDRAM, PHYS_SDRAM_SIZE);
@@ -120,6 +123,18 @@ iomux_v3_cfg_t const usdhc4_pads[] = {
 	MX6_PAD_SD4_DAT7__SD4_DATA7 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
 };
 
+iomux_v3_cfg_t const ecspi1_pads[] = {
+	MX6_PAD_KEY_COL0__ECSPI1_SCLK | MUX_PAD_CTRL(SPI_PAD_CTRL),
+	MX6_PAD_KEY_COL1__ECSPI1_MISO | MUX_PAD_CTRL(SPI_PAD_CTRL),
+	MX6_PAD_KEY_ROW0__ECSPI1_MOSI | MUX_PAD_CTRL(SPI_PAD_CTRL),
+	MX6_PAD_KEY_ROW1__GPIO4_IO09 | MUX_PAD_CTRL(NO_PAD_CTRL),
+};
+
+static void setup_spi(void)
+{
+	imx_iomux_v3_setup_multiple_pads(ecspi1_pads, ARRAY_SIZE(ecspi1_pads));
+}
+
 static void setup_iomux_uart(void)
 {
 	imx_iomux_v3_setup_multiple_pads(uart1_pads, ARRAY_SIZE(uart1_pads));
@@ -455,6 +470,10 @@ int board_init(void)
 	/* address of boot parameters */
 	gd->bd->bi_boot_params = PHYS_SDRAM + 0x100;
 
+#ifdef CONFIG_MXC_SPI
+	setup_spi();
+#endif
+
 	return 0;
 }
 

include/configs/mx6sabre_common.h

@@ -18,6 +18,7 @@
 #define CONFIG_DISPLAY_BOARDINFO
 
 #include <asm/arch/imx-regs.h>
+#include <asm/imx-common/gpio.h>
 
 #define CONFIG_CMDLINE_TAG
 #define CONFIG_SETUP_MEMORY_TAGS
@@ -60,6 +61,17 @@
 #define CONFIG_PHYLIB
 #define CONFIG_PHY_ATHEROS
 
+#define CONFIG_CMD_SF
+#ifdef CONFIG_CMD_SF
+#define CONFIG_SPI_FLASH
+#define CONFIG_SPI_FLASH_STMICRO
+#define CONFIG_MXC_SPI
+#define CONFIG_SF_DEFAULT_BUS		0
+#define CONFIG_SF_DEFAULT_CS		(0 | (IMX_GPIO_NR(4, 9) << 8))
+#define CONFIG_SF_DEFAULT_SPEED		20000000
+#define CONFIG_SF_DEFAULT_MODE		SPI_MODE_0
+#endif
+
 /* allow to overwrite serial and ethaddr */
 #define CONFIG_ENV_OVERWRITE
 #define CONFIG_CONS_INDEX              1