diff options
Diffstat (limited to 'chip/mec1322/flash.c')
| -rw-r--r-- | chip/mec1322/flash.c | 268 |
1 files changed, 0 insertions, 268 deletions
diff --git a/chip/mec1322/flash.c b/chip/mec1322/flash.c deleted file mode 100644 index fac5b08d8f..0000000000 --- a/chip/mec1322/flash.c +++ /dev/null @@ -1,268 +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. - */ - -#include "common.h" -#include "console.h" -#include "flash.h" -#include "host_command.h" -#include "shared_mem.h" -#include "spi.h" -#include "spi_flash.h" -#include "system.h" -#include "util.h" -#include "hooks.h" - -#define PAGE_SIZE 256 - -#define FLASH_SYSJUMP_TAG 0x5750 /* "WP" - Write Protect */ -#define FLASH_HOOK_VERSION 1 - -static int entire_flash_locked; - -/* The previous write protect state before sys jump */ - -struct flash_wp_state { - int entire_flash_locked; -}; - -/** - * Read from physical flash. - * - * @param offset Flash offset to write. - * @param size Number of bytes to write. - * @param data Destination buffer for data. - */ -int crec_flash_physical_read(int offset, int size, char *data) -{ - return spi_flash_read(data, offset, size); -} - -/** - * Write to physical flash. - * - * Offset and size must be a multiple of CONFIG_FLASH_WRITE_SIZE. - * - * @param offset Flash offset to write. - * @param size Number of bytes to write. - * @param data Data to write to flash. Must be 32-bit aligned. - */ -int crec_flash_physical_write(int offset, int size, const char *data) -{ - int ret = EC_SUCCESS; - int i, write_size; - - if (entire_flash_locked) - return EC_ERROR_ACCESS_DENIED; - - /* Fail if offset, size, and data aren't at least word-aligned */ - if ((offset | size | (uint32_t)(uintptr_t)data) & 3) - return EC_ERROR_INVAL; - - for (i = 0; i < size; i += write_size) { - write_size = MIN((size - i), SPI_FLASH_MAX_WRITE_SIZE); - ret = spi_flash_write(offset + i, - write_size, - (uint8_t *)data + i); - if (ret != EC_SUCCESS) - break; - } - return ret; -} - -/** - * Erase physical flash. - * - * Offset and size must be a multiple of CONFIG_FLASH_ERASE_SIZE. - * - * @param offset Flash offset to erase. - * @param size Number of bytes to erase. - */ -int crec_flash_physical_erase(int offset, int size) -{ - int ret; - - if (entire_flash_locked) - return EC_ERROR_ACCESS_DENIED; - - ret = spi_flash_erase(offset, size); - return ret; -} - -/** - * Read physical write protect setting for a flash bank. - * - * @param bank Bank index to check. - * @return non-zero if bank is protected until reboot. - */ -int crec_flash_physical_get_protect(int bank) -{ - return spi_flash_check_protect(bank * CONFIG_FLASH_BANK_SIZE, - CONFIG_FLASH_BANK_SIZE); -} - -/** - * Protect flash now. - * - * This is always successful, and only emulates "now" protection - * - * @param all Protect all (=1) or just read-only - * @return non-zero if error. - */ -int crec_flash_physical_protect_now(int all) -{ - if (all) - entire_flash_locked = 1; - - /* - * RO "now" protection is not currently implemented. If needed, it - * can be added by splitting the entire_flash_locked variable into - * and RO and RW vars, and setting + checking the appropriate var - * as required. - */ - return EC_SUCCESS; -} - -/** - * Return flash protect state flags from the physical layer. - * - * This should only be called by flash_get_protect(). - * - * Uses the EC_FLASH_PROTECT_* flags from ec_commands.h - */ -uint32_t crec_flash_physical_get_protect_flags(void) -{ - uint32_t flags = 0; - - if (spi_flash_check_protect(CONFIG_WP_STORAGE_OFF, - CONFIG_WP_STORAGE_SIZE)) { - flags |= EC_FLASH_PROTECT_RO_AT_BOOT | EC_FLASH_PROTECT_RO_NOW; - } - - if (entire_flash_locked) - flags |= EC_FLASH_PROTECT_ALL_NOW; - - return flags; -} - -/** - * Return the valid flash protect flags. - * - * @return A combination of EC_FLASH_PROTECT_* flags from ec_commands.h - */ -uint32_t crec_flash_physical_get_valid_flags(void) -{ - return EC_FLASH_PROTECT_RO_AT_BOOT | - EC_FLASH_PROTECT_RO_NOW | - EC_FLASH_PROTECT_ALL_NOW; -} - -/** - * Return the writable flash protect flags. - * - * @param cur_flags The current flash protect flags. - * @return A combination of EC_FLASH_PROTECT_* flags from ec_commands.h - */ -uint32_t crec_flash_physical_get_writable_flags(uint32_t cur_flags) -{ - uint32_t ret = 0; - enum spi_flash_wp wp_status = SPI_WP_NONE; - - wp_status = spi_flash_check_wp(); - - if (wp_status == SPI_WP_NONE || (wp_status == SPI_WP_HARDWARE && - !(cur_flags & EC_FLASH_PROTECT_GPIO_ASSERTED))) - ret = EC_FLASH_PROTECT_RO_AT_BOOT | EC_FLASH_PROTECT_RO_NOW; - - if (!entire_flash_locked) - ret |= EC_FLASH_PROTECT_ALL_NOW; - - return ret; -} - -/** - * Enable write protect for the specified range. - * - * Once write protect is enabled, it will stay enabled until HW PIN is - * de-asserted and SRP register is unset. - * - * However, this implementation treats EC_FLASH_PROTECT_ALL_AT_BOOT as - * EC_FLASH_PROTECT_RO_AT_BOOT but tries to remember if "all" region - * is protected. - * - * @param new_flags to protect (only EC_FLASH_PROTECT_*_AT_BOOT are - * taken care of) - * @return EC_SUCCESS, or nonzero if error. - */ -int crec_flash_physical_protect_at_boot(uint32_t new_flags) -{ - int offset, size, ret; - enum spi_flash_wp flashwp = SPI_WP_NONE; - - if ((new_flags & (EC_FLASH_PROTECT_RO_AT_BOOT | - EC_FLASH_PROTECT_ALL_AT_BOOT)) == 0) { - /* Clear protection */ - offset = size = 0; - flashwp = SPI_WP_NONE; - } else { - if (new_flags & EC_FLASH_PROTECT_ALL_AT_BOOT) - entire_flash_locked = 1; - - offset = CONFIG_WP_STORAGE_OFF; - size = CONFIG_WP_STORAGE_SIZE; - flashwp = SPI_WP_HARDWARE; - } - - ret = spi_flash_set_protect(offset, size); - if (ret == EC_SUCCESS) - ret = spi_flash_set_wp(flashwp); - return ret; -} - -/** - * Initialize the module. - * - * Applies at-boot protection settings if necessary. - */ -int crec_flash_pre_init(void) -{ - crec_flash_physical_restore_state(); - return EC_SUCCESS; -} - -int crec_flash_physical_restore_state(void) -{ - uint32_t reset_flags = system_get_reset_flags(); - int version, size; - const struct flash_wp_state *prev; - - /* - * If we have already jumped between images, an earlier image could - * have applied write protection. Nothing additional needs to be done. - */ - if (reset_flags & EC_RESET_FLAG_SYSJUMP) { - prev = (const struct flash_wp_state *)system_get_jump_tag( - FLASH_SYSJUMP_TAG, &version, &size); - if (prev && version == FLASH_HOOK_VERSION && - size == sizeof(*prev)) - entire_flash_locked = prev->entire_flash_locked; - return 1; - } - - return 0; -} - -/*****************************************************************************/ -/* Hooks */ - -static void flash_preserve_state(void) -{ - struct flash_wp_state state; - - state.entire_flash_locked = entire_flash_locked; - - system_add_jump_tag(FLASH_SYSJUMP_TAG, FLASH_HOOK_VERSION, - sizeof(state), &state); -} -DECLARE_HOOK(HOOK_SYSJUMP, flash_preserve_state, HOOK_PRIO_DEFAULT); |