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drivers/spi: Winbond specific write-protection enable

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Extend the SPI interface to enable write-protection.

Tested on Cavium EVB CN81xx using W25Q128.

Change-Id: Ie3765b013855538eca37bc7800d3f9d5d09b8402
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/25105
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
This commit is contained in:
Patrick Rudolph
2018-03-12 11:34:53 +01:00
committed by Philipp Deppenwiese
parent 61322d7ad2
commit e63a5f1e7f
3 changed files with 356 additions and 1 deletions
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49
src/drivers/spi/spi_flash.c
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@ -454,6 +454,55 @@ int spi_flash_is_write_protected(const struct spi_flash *flash,
return flash->ops->get_write_protection(flash, region);
}
int spi_flash_set_write_protected(const struct spi_flash *flash,
const struct region *region,
const bool non_volatile,
const enum spi_flash_status_reg_lockdown mode)
{
struct region flash_region = { 0 };
int ret;
if (!flash)
return -1;
flash_region.size = flash->size;
if (!region_is_subregion(&flash_region, region))
return -1;
if (!flash->ops->set_write_protection) {
printk(BIOS_WARNING, "SPI: Setting write-protection is not "
"implemented for this vendor.\n");
return 0;
}
ret = flash->ops->set_write_protection(flash, region, non_volatile,
mode);
if (ret == 0 && mode != SPI_WRITE_PROTECTION_PRESERVE) {
printk(BIOS_INFO, "SPI: SREG lock-down was set to ");
switch (mode) {
case SPI_WRITE_PROTECTION_NONE:
printk(BIOS_INFO, "NEVER\n");
break;
case SPI_WRITE_PROTECTION_PIN:
printk(BIOS_INFO, "WP\n");
break;
case SPI_WRITE_PROTECTION_REBOOT:
printk(BIOS_INFO, "REBOOT\n");
break;
case SPI_WRITE_PROTECTION_PERMANENT:
printk(BIOS_INFO, "PERMANENT\n");
break;
default:
printk(BIOS_INFO, "UNKNOWN\n");
break;
}
}
return ret;
}
static uint32_t volatile_group_count CAR_GLOBAL;
int spi_flash_volatile_group_begin(const struct spi_flash *flash)