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cfi_flash: Add optional config register write to cfi-detection 

This patch adds the possibility to (optinally) write to the
flash configuration register. The Intel style CFI chips support
such a register that can be used to configure the operation
mode to a non-default value.

This method will be used by the t3corp board, which needs to
configure the DS617 Xilinx flash for async read mode.

Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Stefan Roese 2010-10-25 18:31:48 +02:00
parent 4d2ca9d6a0
commit 6f726f9584
2 changed files with 45 additions and 0 deletions
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43
drivers/mtd/cfi_flash.c
View File

@ -74,6 +74,20 @@ flash_info_t flash_info[CFI_MAX_FLASH_BANKS]; /* FLASH chips info */
#define CONFIG_SYS_FLASH_CFI_WIDTH FLASH_CFI_8BIT
#endif
/*
* 0xffff is an undefined value for the configuration register. When
* this value is returned, the configuration register shall not be
* written at all (default mode).
*/
static u16 cfi_flash_config_reg(int i)
{
#ifdef CONFIG_SYS_CFI_FLASH_CONFIG_REGS
return ((u16 [])CONFIG_SYS_CFI_FLASH_CONFIG_REGS)[i];
#else
return 0xffff;
#endif
}
#if defined(CONFIG_SYS_MAX_FLASH_BANKS_DETECT)
int cfi_flash_num_flash_banks = CONFIG_SYS_MAX_FLASH_BANKS_DETECT;
#endif
@ -2033,6 +2047,31 @@ void flash_set_verbose(uint v)
flash_verbose = v;
}
static void cfi_flash_set_config_reg(u32 base, u16 val)
{
#ifdef CONFIG_SYS_CFI_FLASH_CONFIG_REGS
/*
* Only set this config register if really defined
* to a valid value (0xffff is invalid)
*/
if (val == 0xffff)
return;
/*
* Set configuration register. Data is "encrypted" in the 16 lower
* address bits.
*/
flash_write16(FLASH_CMD_SETUP, (void *)(base + (val << 1)));
flash_write16(FLASH_CMD_SET_CR_CONFIRM, (void *)(base + (val << 1)));
/*
* Finally issue reset-command to bring device back to
* read-array mode
*/
flash_write16(FLASH_CMD_RESET, (void *)base);
#endif
}
/*-----------------------------------------------------------------------
*/
unsigned long flash_init (void)
@ -2056,6 +2095,10 @@ unsigned long flash_init (void)
for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
flash_info[i].flash_id = FLASH_UNKNOWN;
/* Optionally write flash configuration register */
cfi_flash_set_config_reg(cfi_flash_bank_addr(i),
cfi_flash_config_reg(i));
if (!flash_detect_legacy(cfi_flash_bank_addr(i), i))
flash_get_size(cfi_flash_bank_addr(i), i);
size += flash_info[i].size;

2
include/mtd/cfi_flash.h
View File

@ -32,6 +32,8 @@
#define FLASH_CMD_ERASE_CONFIRM 0xD0
#define FLASH_CMD_WRITE 0x40
#define FLASH_CMD_PROTECT 0x60
#define FLASH_CMD_SETUP 0x60
#define FLASH_CMD_SET_CR_CONFIRM 0x03
#define FLASH_CMD_PROTECT_SET 0x01
#define FLASH_CMD_PROTECT_CLEAR 0xD0
#define FLASH_CMD_CLEAR_STATUS 0x50