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nand: zynq: Add support for 16-bit buswidth

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This patch adds support for 16-bit buswidth by determining
the bus width based on mio configuration.

Signed-off-by: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Siva Durga Prasad Paladugu 2017-05-25 14:25:55 +05:30 committed by Michal Simek
parent 6de7a5b907
commit 9ca8388059
1 changed files with 38 additions and 0 deletions
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38
drivers/mtd/nand/zynq_nand.c
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@ -16,6 +16,7 @@
#include <linux/mtd/partitions.h>
#include <linux/mtd/nand_ecc.h>
#include <asm/arch/hardware.h>
#include <asm/arch/sys_proto.h>
/* The NAND flash driver defines */
#define ZYNQ_NAND_CMD_PHASE 1
@ -83,6 +84,15 @@
#define ZYNQ_NAND_ECC_BUSY (1 << 6) /* ECC block is busy */
#define ZYNQ_NAND_ECC_MASK 0x00FFFFFF /* ECC value mask */
#define ZYNQ_NAND_MIO_NUM_NAND_8BIT 13
#define ZYNQ_NAND_MIO_NUM_NAND_16BIT 8
enum zynq_nand_bus_width {
NAND_BW_UNKNOWN = -1,
NAND_BW_8BIT,
NAND_BW_16BIT,
};
#ifndef NAND_CMD_LOCK_TIGHT
#define NAND_CMD_LOCK_TIGHT 0x2c
#endif
@ -1005,6 +1015,23 @@ static int zynq_nand_device_ready(struct mtd_info *mtd)
return 0;
}
static int zynq_nand_check_is_16bit_bw_flash(void)
{
int is_16bit_bw = NAND_BW_UNKNOWN;
int mio_num_8bit = 0, mio_num_16bit = 0;
mio_num_8bit = zynq_slcr_get_mio_pin_status("nand8");
if (mio_num_8bit == ZYNQ_NAND_MIO_NUM_NAND_8BIT)
is_16bit_bw = NAND_BW_8BIT;
mio_num_16bit = zynq_slcr_get_mio_pin_status("nand16");
if (mio_num_8bit == ZYNQ_NAND_MIO_NUM_NAND_8BIT &&
mio_num_16bit == ZYNQ_NAND_MIO_NUM_NAND_16BIT)
is_16bit_bw = NAND_BW_16BIT;
return is_16bit_bw;
}
static int zynq_nand_init(struct nand_chip *nand_chip, int devnum)
{
struct zynq_nand_info *xnand;
@ -1016,6 +1043,7 @@ static int zynq_nand_init(struct nand_chip *nand_chip, int devnum)
unsigned long ecc_cfg;
int ondie_ecc_enabled = 0;
int err = -1;
int is_16bit_bw;
xnand = calloc(1, sizeof(struct zynq_nand_info));
if (!xnand) {
@ -1045,6 +1073,16 @@ static int zynq_nand_init(struct nand_chip *nand_chip, int devnum)
nand_chip->read_buf = zynq_nand_read_buf;
nand_chip->write_buf = zynq_nand_write_buf;
is_16bit_bw = zynq_nand_check_is_16bit_bw_flash();
if (is_16bit_bw == NAND_BW_UNKNOWN) {
printf("%s: Unable detect NAND based on MIO settings\n",
__func__);
goto fail;
}
if (is_16bit_bw == NAND_BW_16BIT)
nand_chip->options = NAND_BUSWIDTH_16;
nand_chip->bbt_options = NAND_BBT_USE_FLASH;
/* Initialize the NAND flash interface on NAND controller */