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qcom: nand: Issue the Reset command before probe

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Reset command must be the first command issued to all
targets after the NAND flash device is powered on.

Change-Id: I617dc5b0ad8d72705dcf20f1cb554134b166e533
Signed-off-by: Sham Muthayyan <smuthayy@codeaurora.org>
This commit is contained in:
Sham Muthayyan 2017-08-18 20:07:00 +05:30 • committed by Gerrit - the friendly Code Review server
parent 636aa76e04
commit db4516262a
2 changed files with 44 additions and 0 deletions
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1
arch/arm/include/asm/arch-qca-common/qpic_nand.h
View file

@ -147,6 +147,7 @@
#define NAND_CMD_PRG_PAGE_ALL 0x39
#define NAND_CMD_BLOCK_ERASE 0x3A
#define NAND_CMD_FETCH_ID 0x0B
#define NAND_CMD_RESET_DEVICE 0x0D
/* NAND Status errors */
#define NAND_FLASH_MPU_ERR (1 << 8)
#define NAND_FLASH_TIMEOUT_ERR (1 << 6)

43
drivers/mtd/nand/qpic_nand.c
View file

@ -849,6 +849,45 @@ qpic_nand_onfi_probe_err:
return onfi_ret;
}
static int
qpic_nand_reset(struct mtd_info *mtd)
{
struct cmd_element *cmd_list_ptr = ce_array;
struct cmd_element *cmd_list_ptr_start = ce_array;
uint8_t num_desc = 0;
uint32_t status, nand_ret;
uint32_t exec_cmd = 1;
uint32_t flash_cmd = NAND_CMD_RESET_DEVICE;
/* Issue the Reset device command to the NANDc */
bam_add_cmd_element(cmd_list_ptr, NAND_FLASH_CMD, (uint32_t)flash_cmd,
CE_WRITE_TYPE);
cmd_list_ptr++;
/* Execute the cmd */
bam_add_cmd_element(cmd_list_ptr, NAND_EXEC_CMD, (uint32_t)exec_cmd,
CE_WRITE_TYPE);
cmd_list_ptr++;
/* Prepare the cmd desc for the above commands */
bam_add_one_desc(&bam, CMD_PIPE_INDEX,
(unsigned char *)cmd_list_ptr_start,
((uint32_t)cmd_list_ptr - (uint32_t)cmd_list_ptr_start),
BAM_DESC_NWD_FLAG | BAM_DESC_CMD_FLAG |
BAM_DESC_INT_FLAG);
/* Keep track of the number of desc added. */
num_desc++;
qpic_nand_wait_for_cmd_exec(num_desc);
status = qpic_nand_read_reg(NAND_FLASH_STATUS, 0);
/* Check for errors */
nand_ret = qpic_nand_check_status(mtd, status);
if (nand_ret) {
printf("Reset cmd status failed\n");
return nand_ret;
}
return nand_ret;
}
/* Enquues a desc for a flash cmd with NWD flag set:
* cfg: Defines the configuration for the flash cmd.
* start: Address where the command elements are added.
@ -2294,6 +2333,10 @@ void qpic_nand_init(void)
qpic_bam_init(&config);
ret = qpic_nand_reset(mtd);
if (ret < 0)
return;
ret = qpic_nand_onfi_probe(mtd);
if (ret < 0)
return;