board/ti/dra7xx: add support for parallel NOR

This patch adds support for parallel NOR device (S29GL512S10) present on J6-EVM.
The Flash device is connected to GPMC controller on chip-select[0] and accessed
as memory-mapped device. It has data-witdh=x16, capacity-64MBytes(512Mbits) and
is CFI compatible.

As multiple devices are share GPMC pins on this board, so following board
settings are required to detect NOR device:
     SW5.1 (NAND_BOOTn) = OFF (logic-1)
     SW5.2 (NOR_BOOTn)  = ON  (logic-0) /* Active-low */
     SW5.3 (eMMC_BOOTn) = OFF (logic-1)
     SW5.4 (QSPI_BOOTn) = OFF (logic-1)

And also set appropriate SYSBOOT configurations:
     SW3.1 (SYSBOOT[ 8])= ON  (logic-1) /* selects SYS_CLK1 speed */
     SW3.2 (SYSBOOT[ 9])= OFF (logic-0) /* selects SYS_CLK1 speed */
     SW3.3 (SYSBOOT[10])= ON  (logic-1) /* wait-pin monitoring = enabled */
     SW3.4 (SYSBOOT[11])= OFF (logic-0) /* device type: Non Muxed */
     SW3.5 (SYSBOOT[12])= OFF (logic-0) /* device type: Non Muxed */
     SW3.6 (SYSBOOT[13])= ON  (logic-1) /* device bus-width: 1(x16) */
     SW3.7 (SYSBOOT[14])= OFF (logic-0) /* reserved */
     SW3.8 (SYSBOOT[15])= ON  (logic-1) /* reserved */

Also, following changes are required to enable NOR Flash support in
dra7xx_evm board profile:

arch/arm/include/asm/arch-omap5/mem.h

@@ -46,13 +46,13 @@
 #define M_NAND_GPMC_CONFIG6	0x16000f80
 #define M_NAND_GPMC_CONFIG7	0x00000008
 
-#define STNOR_GPMC_CONFIG1	0x00001200
-#define STNOR_GPMC_CONFIG2	0x00101000
-#define STNOR_GPMC_CONFIG3	0x00030301
-#define STNOR_GPMC_CONFIG4	0x10041004
-#define STNOR_GPMC_CONFIG5	0x000C1010
+#define STNOR_GPMC_CONFIG1	0x00001000
+#define STNOR_GPMC_CONFIG2	0x001f1f00
+#define STNOR_GPMC_CONFIG3	0x001f1f01
+#define STNOR_GPMC_CONFIG4	0x1f011f01
+#define STNOR_GPMC_CONFIG5	0x001d1f1f
 #define STNOR_GPMC_CONFIG6	0x08070280
-#define STNOR_GPMC_CONFIG7	0x00000F48
+#define STNOR_GPMC_CONFIG7	0x00000048
 
 /* max number of GPMC Chip Selects */
 #define GPMC_MAX_CS		8

board/ti/dra7xx/mux_data.h

@@ -21,6 +21,37 @@ const struct pad_conf_entry core_padconf_array_essential[] = {
 	{MMC1_DAT3, (IEN | PTU | PDIS | M0)},	/* MMC1_DAT3 */
 	{MMC1_SDCD, (FSC | IEN | PTU | PDIS | M0)}, /* MMC1_SDCD */
 	{MMC1_SDWP, (FSC | IEN | PTD | PEN | M14)}, /* MMC1_SDWP */
+#if defined(CONFIG_NOR)
+	/* NOR only pin-mux */
+	{GPMC_A0  , M0 | IDIS | PDIS}, /* nor.GPMC_A[0 ] */
+	{GPMC_A1  , M0 | IDIS | PDIS}, /* nor.GPMC_A[1 ] */
+	{GPMC_A2  , M0 | IDIS | PDIS}, /* nor.GPMC_A[2 ] */
+	{GPMC_A3  , M0 | IDIS | PDIS}, /* nor.GPMC_A[3 ] */
+	{GPMC_A4  , M0 | IDIS | PDIS}, /* nor.GPMC_A[4 ] */
+	{GPMC_A5  , M0 | IDIS | PDIS}, /* nor.GPMC_A[5 ] */
+	{GPMC_A6  , M0 | IDIS | PDIS}, /* nor.GPMC_A[6 ] */
+	{GPMC_A7  , M0 | IDIS | PDIS}, /* nor.GPMC_A[7 ] */
+	{GPMC_A8  , M0 | IDIS | PDIS}, /* nor.GPMC_A[8 ] */
+	{GPMC_A9  , M0 | IDIS | PDIS}, /* nor.GPMC_A[9 ] */
+	{GPMC_A10 , M0 | IDIS | PDIS}, /* nor.GPMC_A[10] */
+	{GPMC_A11 , M0 | IDIS | PDIS}, /* nor.GPMC_A[11] */
+	{GPMC_A12 , M0 | IDIS | PDIS}, /* nor.GPMC_A[12] */
+	{GPMC_A13 , M0 | IDIS | PDIS}, /* nor.GPMC_A[13] */
+	{GPMC_A14 , M0 | IDIS | PDIS}, /* nor.GPMC_A[14] */
+	{GPMC_A15 , M0 | IDIS | PDIS}, /* nor.GPMC_A[15] */
+	{GPMC_A16 , M0 | IDIS | PDIS}, /* nor.GPMC_A[16] */
+	{GPMC_A17 , M0 | IDIS | PDIS}, /* nor.GPMC_A[17] */
+	{GPMC_A18 , M0 | IDIS | PDIS}, /* nor.GPMC_A[18] */
+	{GPMC_A19 , M0 | IDIS | PDIS}, /* nor.GPMC_A[19] */
+	{GPMC_A20 , M0 | IDIS | PDIS}, /* nor.GPMC_A[20] */
+	{GPMC_A21 , M0 | IDIS | PDIS}, /* nor.GPMC_A[21] */
+	{GPMC_A22 , M0 | IDIS | PDIS}, /* nor.GPMC_A[22] */
+	{GPMC_A23 , M0 | IDIS | PDIS}, /* nor.GPMC_A[23] */
+	{GPMC_A24 , M0 | IDIS | PDIS}, /* nor.GPMC_A[24] */
+	{GPMC_A25 , M0 | IDIS | PDIS}, /* nor.GPMC_A[25] */
+	{GPMC_A26 , M0 | IDIS | PDIS}, /* nor.GPMC_A[26] */
+#else
+	/* eMMC pinmux */
 	{GPMC_A19, (IEN | PTU | PDIS | M1)},	/* mmc2_dat4 */
 	{GPMC_A20, (IEN | PTU | PDIS | M1)},	/* mmc2_dat5 */
 	{GPMC_A21, (IEN | PTU | PDIS | M1)},	/* mmc2_dat6 */
@@ -31,6 +62,7 @@ const struct pad_conf_entry core_padconf_array_essential[] = {
 	{GPMC_A26, (IEN | PTU | PDIS | M1)},	/* mmc2_dat2 */
 	{GPMC_A27, (IEN | PTU | PDIS | M1)},	/* mmc2_dat3 */
 	{GPMC_CS1, (IEN | PTU | PDIS | M1)},	/* mmm2_cmd */
+#endif
 #if (CONFIG_CONS_INDEX == 1)
 	{UART1_RXD, (FSC | IEN | PTU | PDIS | M0)}, /* UART1_RXD */
 	{UART1_TXD, (FSC | IEN | PTU | PDIS | M0)}, /* UART1_TXD */
@@ -68,7 +100,7 @@ const struct pad_conf_entry core_padconf_array_essential[] = {
 	{VIN2A_D21, (IEN | M3)},
 	{VIN2A_D22, (IEN | M3)},
 	{VIN2A_D23, (IEN | M3)},
-#ifdef CONFIG_NAND
+#if defined(CONFIG_NAND) || defined(CONFIG_NOR)
 	/* NAND / NOR pin-mux */
 	{GPMC_AD0 , M0 | IEN | PDIS}, /* GPMC_AD0  */
 	{GPMC_AD1 , M0 | IEN | PDIS}, /* GPMC_AD1  */
@@ -105,7 +137,7 @@ const struct pad_conf_entry core_padconf_array_essential[] = {
 	{GPMC_A4, (IEN | PDIS | M1)},   /* QSPI1_CS3 */
 	{GPMC_CS2, (IEN | PTU | PDIS | M1)},    /* QSPI1_CS0 */
 	{GPMC_CS3, (IEN | PTU | PDIS | M1)},    /* QSPI1_CS1*/
-#endif /* CONFIG_NAND */
+#endif /* CONFIG_NAND || CONFIG_NOR */
 	{USB2_DRVVBUS, (M0 | IEN | FSC) },
 };
 #endif /* _MUX_DATA_DRA7XX_H_ */

include/configs/dra7xx_evm.h

@@ -193,4 +193,42 @@
 #endif
 #endif /* !CONFIG_NAND */
 
+/* Parallel NOR Support */
+#if defined(CONFIG_NOR)
+/* NOR: device related configs */
+#define CONFIG_SYS_MAX_FLASH_SECT	512
+#define CONFIG_SYS_FLASH_CFI_WIDTH	FLASH_CFI_16BIT
+#define CONFIG_SYS_FLASH_SIZE		(64 * 1024 * 1024) /* 64 MB */
+/* #define CONFIG_INIT_IGNORE_ERROR */
+#undef CONFIG_SYS_NO_FLASH
+#define CONFIG_CMD_FLASH
+#define CONFIG_SYS_FLASH_USE_BUFFER_WRITE
+#define CONFIG_SYS_FLASH_PROTECTION
+#define CONFIG_SYS_FLASH_CFI
+#define CONFIG_FLASH_CFI_DRIVER
+#define CONFIG_FLASH_CFI_MTD
+#define CONFIG_SYS_MAX_FLASH_BANKS	1
+#define CONFIG_SYS_FLASH_BASE		(0x08000000)
+#define CONFIG_SYS_MONITOR_BASE		CONFIG_SYS_FLASH_BASE
+/* Reduce SPL size by removing unlikey targets */
+#ifdef CONFIG_NOR_BOOT
+#define CONFIG_ENV_IS_IN_FLASH
+#define CONFIG_ENV_SECT_SIZE		(128 * 1024)	/* 128 KiB */
+#define MTDIDS_DEFAULT			"nor0=physmap-flash.0"
+#define MTDPARTS_DEFAULT		"mtdparts=physmap-flash.0:" \
+					"128k(NOR.SPL)," \
+					"128k(NOR.SPL.backup1)," \
+					"128k(NOR.SPL.backup2)," \
+					"128k(NOR.SPL.backup3)," \
+					"256k(NOR.u-boot-spl-os)," \
+					"1m(NOR.u-boot)," \
+					"128k(NOR.u-boot-env)," \
+					"128k(NOR.u-boot-env.backup1)," \
+					"8m(NOR.kernel)," \
+					"-(NOR.rootfs)"
+#define CONFIG_ENV_OFFSET		0x001c0000
+#define CONFIG_ENV_OFFSET_REDUND	0x001e0000
+#endif
+#endif  /* NOR support */
+
 #endif /* __CONFIG_DRA7XX_EVM_H */