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mtd: rawnand: stm32_fmc2: add NAND Write Protect support

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This patch adds the support of the WP# signal. WP will be disabled
before the first access to the NAND flash.

Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
This commit is contained in:
Christophe Kerello 2022-02-22 17:38:49 +01:00 committed by Patrice Chotard
parent c149bf4140
commit 7ce4f1fad2
1 changed files with 9 additions and 0 deletions
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9
drivers/mtd/nand/raw/stm32_fmc2_nand.c
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@ -12,6 +12,7 @@
#include <log.h> #include <log.h>
#include <nand.h> #include <nand.h>
#include <reset.h> #include <reset.h>
#include <asm/gpio.h>
#include <dm/device_compat.h> #include <dm/device_compat.h>
#include <linux/bitfield.h> #include <linux/bitfield.h>
#include <linux/bitops.h> #include <linux/bitops.h>
@ -149,6 +150,7 @@ struct stm32_fmc2_timings {
struct stm32_fmc2_nand { struct stm32_fmc2_nand {
struct nand_chip chip; struct nand_chip chip;
struct stm32_fmc2_timings timings; struct stm32_fmc2_timings timings;
struct gpio_desc wp_gpio;
int ncs; int ncs;
int cs_used[FMC2_MAX_CE]; int cs_used[FMC2_MAX_CE];
}; };
@ -824,6 +826,9 @@ static int stm32_fmc2_nfc_parse_child(struct stm32_fmc2_nfc *nfc, ofnode node)
nand->cs_used[i] = cs[i]; nand->cs_used[i] = cs[i];
} }
gpio_request_by_name_nodev(node, "wp-gpios", 0, &nand->wp_gpio,
GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);
nand->chip.flash_node = node; nand->chip.flash_node = node;
return 0; return 0;
@ -972,6 +977,10 @@ static int stm32_fmc2_nfc_probe(struct udevice *dev)
chip->ecc.size = FMC2_ECC_STEP_SIZE; chip->ecc.size = FMC2_ECC_STEP_SIZE;
chip->ecc.strength = FMC2_ECC_BCH8; chip->ecc.strength = FMC2_ECC_BCH8;
/* Disable Write Protect */
if (dm_gpio_is_valid(&nand->wp_gpio))
dm_gpio_set_value(&nand->wp_gpio, 0);
ret = nand_scan_ident(mtd, nand->ncs, NULL); ret = nand_scan_ident(mtd, nand->ncs, NULL);
if (ret) if (ret)
return ret; return ret;