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mtd: spi-nor-core: Add the ->ready() hook

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For dual/quad die package devices from Spansion/Cypress, the device's
status needs to be checked by reading status registers in all dies, by
using Read Any Register command. To support this, a Flash specific hook
that can overwrite the legacy status check is needed.

Signed-off-by: Takahiro Kuwano <Takahiro.Kuwano@infineon.com>
Reviewed-by: Pratyush Yadav <p.yadav@ti.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
This commit is contained in:
Takahiro Kuwano 2021-06-29 15:01:00 +09:00 committed by Jagan Teki
parent a4aa9b7522
commit 24b1e2c690
2 changed files with 11 additions and 1 deletions
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10
drivers/mtd/spi/spi-nor-core.c
View File

@ -713,7 +713,7 @@ static int spi_nor_fsr_ready(struct spi_nor *nor)
return fsr & FSR_READY;
}
static int spi_nor_ready(struct spi_nor *nor)
static int spi_nor_default_ready(struct spi_nor *nor)
{
int sr, fsr;
@ -726,6 +726,14 @@ static int spi_nor_ready(struct spi_nor *nor)
return sr && fsr;
}
static int spi_nor_ready(struct spi_nor *nor)
{
if (nor->ready)
return nor->ready(nor);
return spi_nor_default_ready(nor);
}
/*
* Service routine to read status register until ready, or timeout occurs.
* Returns non-zero if error.

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

@ -504,6 +504,7 @@ struct spi_flash {
* completely locked
* @quad_enable: [FLASH-SPECIFIC] enables SPI NOR quad mode
* @octal_dtr_enable: [FLASH-SPECIFIC] enables SPI NOR octal DTR mode.
* @ready: [FLASH-SPECIFIC] check if the flash is ready
* @priv: the private data
*/
struct spi_nor {
@ -552,6 +553,7 @@ struct spi_nor {
int (*flash_is_locked)(struct spi_nor *nor, loff_t ofs, uint64_t len);
int (*quad_enable)(struct spi_nor *nor);
int (*octal_dtr_enable)(struct spi_nor *nor);
int (*ready)(struct spi_nor *nor);
void *priv;
/* Compatibility for spi_flash, remove once sf layer is merged with mtd */