diff options
Diffstat (limited to 'src/drivers/spi/winbond.c')
| -rw-r--r-- | src/drivers/spi/winbond.c | 77 |
1 files changed, 58 insertions, 19 deletions
diff --git a/src/drivers/spi/winbond.c b/src/drivers/spi/winbond.c index 799262953e..3137bfe8a7 100644 --- a/src/drivers/spi/winbond.c +++ b/src/drivers/spi/winbond.c @@ -19,14 +19,14 @@ union status_reg1 { uint8_t tb : 1; uint8_t sec : 1; uint8_t srp0 : 1; - } bp3; + } bp3; /* for example: W25Q128FW */ struct { uint8_t busy : 1; uint8_t wel : 1; uint8_t bp : 4; uint8_t tb : 1; uint8_t srp0 : 1; - } bp4; + } bp4; /* for example: W25Q256J */ }; union status_reg2 { @@ -254,16 +254,15 @@ static const struct spi_flash_part_id flash_table[] = { * SEC (if available) must be zero. */ static void winbond_bpbits_to_region(const size_t granularity, - const u8 bp, - bool tb, - const bool cmp, + const struct spi_flash_bpbits *bits, const size_t flash_size, struct region *out) { size_t protected_size = - MIN(bp ? granularity << (bp - 1) : 0, flash_size); + MIN(bits->bp ? granularity << (bits->bp - 1) : 0, flash_size); - if (cmp) { + int tb = bits->tb; + if (bits->cmp) { protected_size = flash_size - protected_size; tb = !tb; } @@ -287,8 +286,7 @@ static int winbond_get_write_protection(const struct spi_flash *flash, { const struct spi_flash_part_id *params; struct region wp_region; - union status_reg2 reg2; - u8 bp, tb; + struct spi_flash_bpbits bpbits; int ret; params = flash->part; @@ -299,34 +297,75 @@ static int winbond_get_write_protection(const struct spi_flash *flash, const size_t granularity = (1 << params->protection_granularity_shift); union status_reg1 reg1 = { .u = 0 }; + union status_reg2 reg2 = { .u = 0 }; ret = spi_flash_cmd(&flash->spi, flash->status_cmd, ®1.u, sizeof(reg1.u)); if (ret) return ret; + ret = spi_flash_cmd(&flash->spi, CMD_W25_RDSR2, ®2.u, + sizeof(reg2.u)); + if (ret) + return ret; + if (params->bp_bits == 3) { if (reg1.bp3.sec) { // FIXME: not supported return -1; } - bp = reg1.bp3.bp; - tb = reg1.bp3.tb; + bpbits = (struct spi_flash_bpbits){ + .bp = reg1.bp3.bp, + .cmp = reg2.cmp, + .tb = reg1.bp3.tb, + /* + * For W25Q*{,F}* parts: + * srp1 srp0 + * 0 0 | writable if WEL==1 + * 0 1 | writable if WEL==1 && #WP==Vcc + * 1 0 | not writable until next power-down + * 1 1 | not writable, permanently + * + * checked datasheets: W25Q128FV, (W25Q80, W25Q16, + * W25Q32) + */ + .winbond = { + .srp0 = reg1.bp3.srp0, + .srp1 = reg2.srp1, + }, + }; } else if (params->bp_bits == 4) { - bp = reg1.bp4.bp; - tb = reg1.bp4.tb; + bpbits = (struct spi_flash_bpbits){ + .bp = reg1.bp4.bp, + .cmp = reg2.cmp, + .tb = reg1.bp4.tb, + /* + * For W25Q*{J,D}* parts: + * + * srp1 srp0 + * 0 0 | writable if WEL==1 + * 0 1 | writable if WEL==1 && #WP==Vcc + * 1 x | not writable until next power-down + * + * checked datasheets: W25Q132JW, W25Q128JW, W25Q256JV. + * W25Q16DW + * + * The srp0/srp1 bits got renamed to srp/srl in the + * datasheets, we retain the prior naming + * convention for the structs though. + */ + .winbond = { + .srp0 = reg1.bp4.srp0, + .srp1 = reg2.srp1, + }, + }; } else { // FIXME: not supported return -1; } - ret = spi_flash_cmd(&flash->spi, CMD_W25_RDSR2, ®2.u, - sizeof(reg2.u)); - if (ret) - return ret; - - winbond_bpbits_to_region(granularity, bp, tb, reg2.cmp, flash->size, + winbond_bpbits_to_region(granularity, &bpbits, flash->size, &wp_region); if (!region_sz(&wp_region)) { |