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mtd: spi-nor: Create a ->set_4byte() method 

The procedure used to enable 4 byte addressing mode depends on the NOR
device, so let's provide a hook so that manufacturer specific handling
can be implemented in a sane way.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
[tudor.ambarus@microchip.com: use nor->params.set_4byte() instead of
nor->set_4byte()]
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: Vignesh Raghavendra <vigneshr@ti.com>
This commit is contained in:
Boris Brezillon 2019-08-24 08:45:28 +03:00 committed by Tudor Ambarus
parent 1c1d8d98e1
commit 64c160f322
No known key found for this signature in database
GPG Key ID: 4B554F47A58D14E9
2 changed files with 41 additions and 37 deletions
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68
drivers/mtd/spi-nor/spi-nor.c
View File

@ -633,6 +633,17 @@ static int macronix_set_4byte(struct spi_nor *nor, bool enable)
NULL, 0);
}
static int st_micron_set_4byte(struct spi_nor *nor, bool enable)
{
int ret;
write_enable(nor);
ret = macronix_set_4byte(nor, enable);
write_disable(nor);
return ret;
}
static int spansion_set_4byte(struct spi_nor *nor, bool enable)
{
nor->bouncebuf[0] = enable << 7;
@ -667,45 +678,24 @@ static int spi_nor_write_ear(struct spi_nor *nor, u8 ear)
return nor->write_reg(nor, SPINOR_OP_WREAR, nor->bouncebuf, 1);
}
/* Enable/disable 4-byte addressing mode. */
static int set_4byte(struct spi_nor *nor, bool enable)
static int winbond_set_4byte(struct spi_nor *nor, bool enable)
{
int status;
bool need_wren = false;
int ret;
switch (JEDEC_MFR(nor->info)) {
case SNOR_MFR_ST:
case SNOR_MFR_MICRON:
/* Some Micron need WREN command; all will accept it */
need_wren = true;
/* fall through */
case SNOR_MFR_MACRONIX:
case SNOR_MFR_WINBOND:
if (need_wren)
write_enable(nor);
ret = macronix_set_4byte(nor, enable);
if (ret || enable)
return ret;
status = macronix_set_4byte(nor, enable);
if (need_wren)
write_disable(nor);
if (!status && !enable &&
JEDEC_MFR(nor->info) == SNOR_MFR_WINBOND) {
/*
* On Winbond W25Q256FV, leaving 4byte mode causes
* the Extended Address Register to be set to 1, so all
* 3-byte-address reads come from the second 16M.
* We must clear the register to enable normal behavior.
* On Winbond W25Q256FV, leaving 4byte mode causes the Extended Address
* Register to be set to 1, so all 3-byte-address reads come from the
* second 16M. We must clear the register to enable normal behavior.
*/
write_enable(nor);
spi_nor_write_ear(nor, 0);
ret = spi_nor_write_ear(nor, 0);
write_disable(nor);
}
return status;
default:
/* Spansion style */
return spansion_set_4byte(nor, enable);
}
return ret;
}
static int spi_nor_xread_sr(struct spi_nor *nor, u8 *sr)
@ -4153,11 +4143,18 @@ exit:
static void macronix_set_default_init(struct spi_nor *nor)
{
nor->params.quad_enable = macronix_quad_enable;
nor->params.set_4byte = macronix_set_4byte;
}
static void st_micron_set_default_init(struct spi_nor *nor)
{
nor->params.quad_enable = NULL;
nor->params.set_4byte = st_micron_set_4byte;
}
static void winbond_set_default_init(struct spi_nor *nor)
{
nor->params.set_4byte = winbond_set_4byte;
}
/**
@ -4178,6 +4175,10 @@ static void spi_nor_manufacturer_init_params(struct spi_nor *nor)
st_micron_set_default_init(nor);
break;
case SNOR_MFR_WINBOND:
winbond_set_default_init(nor);
break;
default:
break;
}
@ -4222,6 +4223,7 @@ static void spi_nor_info_init_params(struct spi_nor *nor)
/* Initialize legacy flash parameters and settings. */
params->quad_enable = spansion_quad_enable;
params->set_4byte = spansion_set_4byte;
/* Set SPI NOR sizes. */
params->size = (u64)info->sector_size * info->n_sectors;
@ -4587,7 +4589,7 @@ static int spi_nor_init(struct spi_nor *nor)
*/
WARN_ONCE(nor->flags & SNOR_F_BROKEN_RESET,
"enabling reset hack; may not recover from unexpected reboots\n");
set_4byte(nor, true);
nor->params.set_4byte(nor, true);
}
return 0;
@ -4611,7 +4613,7 @@ void spi_nor_restore(struct spi_nor *nor)
/* restore the addressing mode */
if (nor->addr_width == 4 && !(nor->flags & SNOR_F_4B_OPCODES) &&
nor->flags & SNOR_F_BROKEN_RESET)
set_4byte(nor, false);
nor->params.set_4byte(nor, false);
}
EXPORT_SYMBOL_GPL(spi_nor_restore);

2
include/linux/mtd/spi-nor.h
View File

@ -482,6 +482,7 @@ struct spi_nor;
* @erase_map: the erase map parsed from the SFDP Sector Map Parameter
* Table.
* @quad_enable: enables SPI NOR quad mode.
* @set_4byte: puts the SPI NOR in 4 byte addressing mode.
*/
struct spi_nor_flash_parameter {
u64 size;
@ -494,6 +495,7 @@ struct spi_nor_flash_parameter {
struct spi_nor_erase_map erase_map;
int (*quad_enable)(struct spi_nor *nor);
int (*set_4byte)(struct spi_nor *nor, bool enable);
};
/**