am335x: fix GPMC config for NAND and NOR SPL boot

GPMC controller is common IP to interface with both NAND and NOR flash devices.
Also, it supports max 8 chip-selects, which can be independently connected to
any of the devices.
But ROM code expects the boot-device to be connected to only chip-select[0].
Thus to resolve conflict between NOR and NAND boot. This patch:
- combines NOR and NAND configs spread in board files to common gpmc_init()
- configures GPMC based on boot-mode selected for SPL boot.

Signed-off-by: Pekon Gupta <pekon@ti.com>

arch/arm/cpu/armv7/am33xx/mem.c

@@ -22,17 +22,6 @@
 
 struct gpmc *gpmc_cfg;
 
-#if defined(CONFIG_CMD_NAND)
-static const u32 gpmc_m_nand[GPMC_MAX_REG] = {
-	M_NAND_GPMC_CONFIG1,
-	M_NAND_GPMC_CONFIG2,
-	M_NAND_GPMC_CONFIG3,
-	M_NAND_GPMC_CONFIG4,
-	M_NAND_GPMC_CONFIG5,
-	M_NAND_GPMC_CONFIG6, 0
-};
-#endif
-
 
 void enable_gpmc_cs_config(const u32 *gpmc_config, struct gpmc_cs *cs, u32 base,
 			u32 size)
@@ -61,11 +50,34 @@ void gpmc_init(void)
 {
 	/* putting a blanket check on GPMC based on ZeBu for now */
 	gpmc_cfg = (struct gpmc *)GPMC_BASE;
-
+#if defined(CONFIG_NOR)
-#ifdef CONFIG_CMD_NAND
+/* configure GPMC for NOR */
-	const u32 *gpmc_config = NULL;
+	const u32 gpmc_regs[GPMC_MAX_REG] = {	STNOR_GPMC_CONFIG1,
-	u32 base = 0;
+						STNOR_GPMC_CONFIG2,
+						STNOR_GPMC_CONFIG3,
+						STNOR_GPMC_CONFIG4,
+						STNOR_GPMC_CONFIG5,
+						STNOR_GPMC_CONFIG6,
+						STNOR_GPMC_CONFIG7
+						};
+	u32 size = GPMC_SIZE_16M;
+	u32 base = CONFIG_SYS_FLASH_BASE;
+#elif defined(CONFIG_NAND)
+/* configure GPMC for NAND */
+	const u32  gpmc_regs[GPMC_MAX_REG] = {	M_NAND_GPMC_CONFIG1,
+						M_NAND_GPMC_CONFIG2,
+						M_NAND_GPMC_CONFIG3,
+						M_NAND_GPMC_CONFIG4,
+						M_NAND_GPMC_CONFIG5,
+						M_NAND_GPMC_CONFIG6,
+						0
+						};
+	u32 size = GPMC_SIZE_256M;
+	u32 base = CONFIG_SYS_NAND_BASE;
+#else
+	const u32 gpmc_regs[GPMC_MAX_REG] = { 0, 0, 0, 0, 0, 0, 0 };
 	u32 size = 0;
+	u32 base = 0;
 #endif
 	/* global settings */
 	writel(0x00000008, &gpmc_cfg->sysconfig);
@@ -81,12 +93,6 @@ void gpmc_init(void)
 	 */
 	writel(0, &gpmc_cfg->cs[0].config7);
 	sdelay(1000);
-
+	/* enable chip-select specific configurations */
-#ifdef CONFIG_CMD_NAND
+	enable_gpmc_cs_config(gpmc_regs, &gpmc_cfg->cs[0], base, size);
-	gpmc_config = gpmc_m_nand;
-
-	base = PISMO1_NAND_BASE;
-	size = PISMO1_NAND_SIZE;
-	enable_gpmc_cs_config(gpmc_config, &gpmc_cfg->cs[0], base, size);
-#endif
 }

arch/arm/include/asm/arch-am33xx/mem.h

@@ -68,9 +68,4 @@
 #define PISMO2_NAND_CS0		7
 #define PISMO2_NAND_CS1		8
 
-/* make it readable for the gpmc_init */
-#define PISMO1_NOR_BASE	FLASH_BASE
-#define PISMO1_NAND_BASE	CONFIG_SYS_NAND_BASE
-#define PISMO1_NAND_SIZE	GPMC_SIZE_256M
-
 #endif /* endif _MEM_H_ */

board/ti/am335x/board.c

@@ -481,26 +481,14 @@ void sdram_init(void)
  */
 int board_init(void)
 {
-#ifdef CONFIG_NOR
-	const u32 gpmc_nor[GPMC_MAX_REG] = { STNOR_GPMC_CONFIG1,
-		STNOR_GPMC_CONFIG2, STNOR_GPMC_CONFIG3, STNOR_GPMC_CONFIG4,
-		STNOR_GPMC_CONFIG5, STNOR_GPMC_CONFIG6, STNOR_GPMC_CONFIG7 };
-#endif
-
 #if defined(CONFIG_HW_WATCHDOG)
 	hw_watchdog_init();
 #endif
 
 	gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100;
-
+#if defined(CONFIG_NOR) || defined(CONFIG_NAND)
 	gpmc_init();
-
-#ifdef CONFIG_NOR
-	/* Reconfigure CS0 for NOR instead of NAND. */
-	enable_gpmc_cs_config(gpmc_nor, &gpmc_cfg->cs[0],
-			      CONFIG_SYS_FLASH_BASE, GPMC_SIZE_16M);
 #endif
-
 	return 0;
 }