diff options
Diffstat (limited to 'writeprotect.c')
| -rw-r--r-- | writeprotect.c | 50 |
1 files changed, 44 insertions, 6 deletions
diff --git a/writeprotect.c b/writeprotect.c index 82ecd8e6..6b3bbcf3 100644 --- a/writeprotect.c +++ b/writeprotect.c @@ -348,6 +348,50 @@ static int set_wp_range(struct wp_bits *bits, struct flashctx *flash, const stru return ret; } +/** Get the mode selected by a WP configuration. */ +static int get_wp_mode(enum flashrom_wp_mode *mode, const struct wp_bits *bits) +{ + if (!bits->srp_bit_present) + return FLASHROM_WP_ERR_CHIP_UNSUPPORTED; + + if (bits->srl_bit_present && bits->srl == 1) { + *mode = bits->srp ? FLASHROM_WP_MODE_PERMANENT : + FLASHROM_WP_MODE_POWER_CYCLE; + } else { + *mode = bits->srp ? FLASHROM_WP_MODE_HARDWARE : + FLASHROM_WP_MODE_DISABLED; + } + + return FLASHROM_WP_OK; +} + +/** Modify a wp_bits structure such that it will select a specified protection mode. */ +static int set_wp_mode(struct wp_bits *bits, const enum flashrom_wp_mode mode) +{ + switch (mode) { + case FLASHROM_WP_MODE_DISABLED: + bits->srl = 0; + bits->srp = 0; + return FLASHROM_WP_OK; + + case FLASHROM_WP_MODE_HARDWARE: + bits->srl = 0; + bits->srp = 1; + return FLASHROM_WP_OK; + + case FLASHROM_WP_MODE_POWER_CYCLE: + case FLASHROM_WP_MODE_PERMANENT: + default: + /* + * Don't try to enable power cycle or permanent protection for + * now. Those modes may be possible to activate on some chips, + * but they are usually unavailable by default or require special + * commands to activate. + */ + return FLASHROM_WP_ERR_MODE_UNSUPPORTED; + } +} + static bool chip_supported(struct flashctx *flash) { return (flash->chip != NULL) && (flash->chip->decode_range != NULL); @@ -367,11 +411,8 @@ enum flashrom_wp_result wp_read_cfg(struct flashrom_wp_cfg *cfg, struct flashctx if (ret == FLASHROM_WP_OK) ret = get_wp_range(&cfg->range, flash, &bits); - /* TODO: implement and get_wp_mode() and call it */ - /* if (ret == FLASHROM_WP_OK) ret = get_wp_mode(&cfg->mode, &bits); - */ return ret; } @@ -394,11 +435,8 @@ enum flashrom_wp_result wp_write_cfg(struct flashctx *flash, const struct flashr ret = write_wp_bits(flash, bits); /* Set protection mode */ - /* TODO: implement set_wp_mode() and use it */ - /* if (ret == FLASHROM_WP_OK) ret = set_wp_mode(&bits, cfg->mode); - */ if (ret == FLASHROM_WP_OK) ret = write_wp_bits(flash, bits); |