diff options
Diffstat (limited to 'common/spi_flash_reg.c')
| -rw-r--r-- | common/spi_flash_reg.c | 190 |
1 files changed, 0 insertions, 190 deletions
diff --git a/common/spi_flash_reg.c b/common/spi_flash_reg.c deleted file mode 100644 index ee8d31fa06..0000000000 --- a/common/spi_flash_reg.c +++ /dev/null @@ -1,190 +0,0 @@ -/* - * Copyright 2015 The Chromium OS Authors. All rights reserved. - * Use of this source code is governed by a BSD-style license that can be - * found in the LICENSE file. - * - * SPI flash protection register translation functions for Chrome OS EC. - */ - -#include "common.h" -#include "spi_flash_reg.h" -#include "util.h" - -/* Bit state for protect range table */ -enum bit_state { - OFF = 0, - ON = 1, - IGN = -1, /* Don't care / Ignore */ -}; - -struct protect_range { - enum bit_state cmp; - enum bit_state sec; - enum bit_state tb; - enum bit_state bp[3]; /* Ordered {BP2, BP1, BP0} */ - uint32_t protect_start; - uint32_t protect_len; -}; - -/* Compare macro for (x =? b) for 'IGN' comparison */ -#define COMPARE_BIT(a, b) ((a) != IGN && (a) != !!(b)) -/* Assignment macro where 'IGN' = 0 */ -#define GET_BIT(a) ((a) == IGN ? 0 : (a)) - -/* - * Define flags and protect table for each SPI ROM part. It's not necessary - * to define all ranges in the datasheet since we'll usually protect only - * none or half of the ROM. The table is searched sequentially, so ordering - * according to likely configurations improves performance slightly. - */ -#if defined(CONFIG_SPI_FLASH_W25X40) || defined(CONFIG_SPI_FLASH_GD25Q41B) -static const struct protect_range spi_flash_protect_ranges[] = { - { IGN, IGN, IGN, { 0, 0, 0 }, 0, 0 }, /* No protection */ - { IGN, IGN, 1, { 0, 1, 1 }, 0, 0x40000 }, /* Lower 1/2 */ - { IGN, IGN, 1, { 0, 1, 0 }, 0, 0x20000 }, /* Lower 1/4 */ -}; - -#elif defined(CONFIG_SPI_FLASH_W25Q40) || defined(CONFIG_SPI_FLASH_GD25LQ40) -/* Verified for W25Q40BV and W25Q40EW */ -/* For GD25LQ40, BP3 and BP4 have same meaning as TB and SEC */ -static const struct protect_range spi_flash_protect_ranges[] = { - /* CMP = 0 */ - { 0, IGN, IGN, { 0, 0, 0 }, 0, 0 }, /* No protection */ - { 0, 0, 1, { 0, 1, 0 }, 0, 0x20000 }, /* Lower 1/4 */ - { 0, 0, 1, { 0, 1, 1 }, 0, 0x40000 }, /* Lower 1/2 */ - /* CMP = 1 */ - { 1, 0, 0, { 0, 1, 1 }, 0, 0x40000 }, /* Lower 1/2 */ - { 1, 0, IGN, { 1, IGN, IGN }, 0, 0 }, /* None (W25Q40EW only) */ -}; - -#elif defined(CONFIG_SPI_FLASH_W25Q64) -static const struct protect_range spi_flash_protect_ranges[] = { - { 0, IGN, IGN, { 0, 0, 0 }, 0, 0 }, /* No protection */ - { 0, 0, 1, { 1, 1, 0 }, 0, 0x400000 }, /* Lower 1/2 */ - { 0, 0, 1, { 1, 0, 1 }, 0, 0x200000 }, /* Lower 1/4 */ -}; - -#elif defined(CONFIG_SPI_FLASH_W25Q80) -static const struct protect_range spi_flash_protect_ranges[] = { - /* CMP = 0 */ - { 0, IGN, IGN, { 0, 0, 0 }, 0, 0 }, /* No protection */ - { 0, 0, 1, { 0, 1, 0 }, 0, 0x20000 }, /* Lower 1/8 */ - { 0, 0, 1, { 0, 1, 1 }, 0, 0x40000 }, /* Lower 1/4 */ - { 0, 0, 1, { 1, 0, 0 }, 0, 0x80000 }, /* Lower 1/2 */ -}; -#elif defined(CONFIG_SPI_FLASH_W25Q128) -static const struct protect_range spi_flash_protect_ranges[] = { - /* CMP = 0 */ - { 0, IGN, IGN, { 0, 0, 0 }, 0, 0 }, /* No protection */ - { 0, 0, 1, { 1, 0, 0 }, 0, 0x20000 }, /* Lower 1/8 */ - { 0, 0, 1, { 1, 0, 1 }, 0, 0x40000 }, /* Lower 1/4 */ - { 0, 0, 1, { 1, 1, 0 }, 0, 0x80000 }, /* Lower 1/2 */ -}; -#endif - -/** - * Computes block write protection range from registers - * Returns start == len == 0 for no protection - * - * @param sr1 Status register 1 - * @param sr2 Status register 2 - * @param start Output pointer for protection start offset - * @param len Output pointer for protection length - * - * @return EC_SUCCESS, or non-zero if any error. - */ -int spi_flash_reg_to_protect(uint8_t sr1, uint8_t sr2, unsigned int *start, - unsigned int *len) -{ - const struct protect_range *range; - int i; - uint8_t cmp; - uint8_t sec; - uint8_t tb; - uint8_t bp; - - /* Determine flags */ - cmp = (sr2 & SPI_FLASH_SR2_CMP) ? 1 : 0; - sec = (sr1 & SPI_FLASH_SR1_SEC) ? 1 : 0; - tb = (sr1 & SPI_FLASH_SR1_TB) ? 1 : 0; - bp = (sr1 & (SPI_FLASH_SR1_BP2 | SPI_FLASH_SR1_BP1 | SPI_FLASH_SR1_BP0)) - >> 2; - - /* Bad pointers or invalid data */ - if (!start || !len || sr1 == 0xff || sr2 == 0xff) - return EC_ERROR_INVAL; - - for (i = 0; i < ARRAY_SIZE(spi_flash_protect_ranges); ++i) { - range = &spi_flash_protect_ranges[i]; - if (COMPARE_BIT(range->cmp, cmp)) - continue; - if (COMPARE_BIT(range->sec, sec)) - continue; - if (COMPARE_BIT(range->tb, tb)) - continue; - if (COMPARE_BIT(range->bp[0], bp & 0x4)) - continue; - if (COMPARE_BIT(range->bp[1], bp & 0x2)) - continue; - if (COMPARE_BIT(range->bp[2], bp & 0x1)) - continue; - - *start = range->protect_start; - *len = range->protect_len; - return EC_SUCCESS; - } - - /* Invalid range, or valid range missing from our table */ - return EC_ERROR_INVAL; -} - -/** - * Computes block write protection registers from range - * - * @param start Desired protection start offset - * @param len Desired protection length - * @param sr1 Output pointer for status register 1 - * @param sr2 Output pointer for status register 2 - * - * @return EC_SUCCESS, or non-zero if any error. - */ -int spi_flash_protect_to_reg(unsigned int start, unsigned int len, uint8_t *sr1, - uint8_t *sr2) -{ - const struct protect_range *range; - int i; - char cmp = 0; - char sec = 0; - char tb = 0; - char bp = 0; - - /* Bad pointers */ - if (!sr1 || !sr2) - return EC_ERROR_INVAL; - - /* Invalid data */ - if ((start && !len) || start + len > CONFIG_FLASH_SIZE_BYTES) - return EC_ERROR_INVAL; - - for (i = 0; i < ARRAY_SIZE(spi_flash_protect_ranges); ++i) { - range = &spi_flash_protect_ranges[i]; - if (range->protect_start == start && - range->protect_len == len) { - cmp = GET_BIT(range->cmp); - sec = GET_BIT(range->sec); - tb = GET_BIT(range->tb); - bp = GET_BIT(range->bp[0]) << 2 | - GET_BIT(range->bp[1]) << 1 | - GET_BIT(range->bp[2]); - - *sr1 = (sec ? SPI_FLASH_SR1_SEC : 0) | - (tb ? SPI_FLASH_SR1_TB : 0) | - (bp << 2); - *sr2 = (cmp ? SPI_FLASH_SR2_CMP : 0); - return EC_SUCCESS; - } - } - - /* Invalid range, or valid range missing from our table */ - return EC_ERROR_INVAL; -} |