From 77cd89e75563742aa32cf3d216ac9ff649d1d70e Mon Sep 17 00:00:00 2001
From: pekon gupta <pekon@ti.com>
Date: Fri, 18 Jul 2014 17:59:40 +0530
Subject: [PATCH] ARM: omap: fix GPMC address-map size for NAND and NOR devices
Fixes commit a0a37183bd75e74608bc78c8d0e2a34454f95a91
ARM: omap: merge GPMC initialization code for all platform
1) NAND device are not directly memory-mapped to CPU address-space, they are
indirectly accessed via following GPMC registers:
- GPMC_NAND_COMMAND_x
- GPMC_NAND_ADDRESS_x
- GPMC_NAND_DATA_x
Therefore from CPU's point of view, NAND address-map can be limited to just
above register addresses. But GPMC chip-select address-map can be configured
in granularity of 16MB only.
So this patch uses GPMC_SIZE_16M for all NAND devices.
2) NOR device are directly memory-mapped to CPU address-space, so its
address-map size depends on actual addressable region in NOR FLASH device.
So this patch uses CONFIG_SYS_FLASH_SIZE to derive GPMC chip-select address-map
size configuration.
Signed-off-by: Pekon Gupta <pekon@ti.com>
---
arch/arm/cpu/armv7/omap-common/mem-common.c | 9 +++++++--
include/configs/am335x_evm.h | 1 +
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/arch/arm/cpu/armv7/omap-common/mem-common.c b/arch/arm/cpu/armv7/omap-common/mem-common.c
index ba26cd1fdb..e9da70fe70 100644
--- a/arch/arm/cpu/armv7/omap-common/mem-common.c
+++ b/arch/arm/cpu/armv7/omap-common/mem-common.c
@@ -87,8 +87,12 @@ void gpmc_init(void)
STNOR_GPMC_CONFIG6,
STNOR_GPMC_CONFIG7
};
- u32 size = GPMC_SIZE_16M;
u32 base = CONFIG_SYS_FLASH_BASE;
+ u32 size = (CONFIG_SYS_FLASH_SIZE > 0x08000000) ? GPMC_SIZE_256M :
+ /* > 64MB */ ((CONFIG_SYS_FLASH_SIZE > 0x04000000) ? GPMC_SIZE_128M :
+ /* > 32MB */ ((CONFIG_SYS_FLASH_SIZE > 0x02000000) ? GPMC_SIZE_64M :
+ /* > 16MB */ ((CONFIG_SYS_FLASH_SIZE > 0x01000000) ? GPMC_SIZE_32M :
+ /* min 16MB */ GPMC_SIZE_16M)));
#elif defined(CONFIG_NAND) || defined(CONFIG_CMD_NAND)
/* configure GPMC for NAND */
const u32 gpmc_regs[GPMC_MAX_REG] = { M_NAND_GPMC_CONFIG1,
@@ -99,8 +103,9 @@ void gpmc_init(void)
M_NAND_GPMC_CONFIG6,
0
};
- u32 size = GPMC_SIZE_256M;
u32 base = CONFIG_SYS_NAND_BASE;
+ u32 size = GPMC_SIZE_16M;
+
#elif defined(CONFIG_CMD_ONENAND)
const u32 gpmc_regs[GPMC_MAX_REG] = { ONENAND_GPMC_CONFIG1,
ONENAND_GPMC_CONFIG2,
diff --git a/include/configs/am335x_evm.h b/include/configs/am335x_evm.h
index a48b386477..c1a6ada0a8 100644
--- a/include/configs/am335x_evm.h
+++ b/include/configs/am335x_evm.h
@@ -453,6 +453,7 @@
#define CONFIG_SYS_MAX_FLASH_BANKS 1
#define CONFIG_SYS_FLASH_BASE (0x08000000)
#define CONFIG_SYS_FLASH_CFI_WIDTH FLASH_CFI_16BIT
+#define CONFIG_SYS_FLASH_SIZE 0x01000000
#define CONFIG_SYS_MONITOR_BASE CONFIG_SYS_FLASH_BASE
/* Reduce SPL size by removing unlikey targets */
#ifdef CONFIG_NOR_BOOT
--
2.39.5