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| 1 | +/* Copyright 2022 The Chromium OS Authors. All rights reserved. |
| 2 | + * Use of this source code is governed by a BSD-style license that can be |
| 3 | + * found in the LICENSE file. |
| 4 | + */ |
| 5 | + |
| 6 | +#include "util.h" |
| 7 | +#include "hooks.h" |
| 8 | + |
| 9 | +#include "board.h" |
| 10 | +#include "gpio.h" |
| 11 | + |
| 12 | +#include "spi.h" |
| 13 | +#include "spi_chip.h" |
| 14 | +#include "spi_flash.h" |
| 15 | + |
| 16 | +#include "flash_storage.h" |
| 17 | + |
| 18 | + |
| 19 | + |
| 20 | + |
| 21 | + |
| 22 | + |
| 23 | +#define CPRINTS(format, args...) cprints(CC_SYSTEM, format, ## args) |
| 24 | +#define CPRINTF(format, args...) cprintf(CC_SYSTEM, format, ## args) |
| 25 | + |
| 26 | +static struct ec_flash_flags_info current_flags; |
| 27 | +bool flash_storage_dirty; |
| 28 | + |
| 29 | +bool check_flags_valid_header(void) |
| 30 | +{ |
| 31 | + if (current_flags.magic != FLASH_FLAGS_MAGIC || |
| 32 | + current_flags.length != (sizeof(current_flags) - 8) || |
| 33 | + current_flags.version != FLASH_FLAGS_VERSION) { |
| 34 | + return false; |
| 35 | + } else { |
| 36 | + return true; |
| 37 | + } |
| 38 | +} |
| 39 | + |
| 40 | +void flash_storage_load_defaults(void) |
| 41 | +{ |
| 42 | + CPRINTS("Init flash storage to defaults"); |
| 43 | + memset(¤t_flags, 0x00, sizeof(current_flags)); |
| 44 | + current_flags.magic = FLASH_FLAGS_MAGIC; |
| 45 | + current_flags.length = (sizeof(current_flags) - 8); |
| 46 | + current_flags.version = FLASH_FLAGS_VERSION; |
| 47 | + flash_storage_dirty = true; |
| 48 | +} |
| 49 | + |
| 50 | +int flash_storage_initialize(void) |
| 51 | +{ |
| 52 | + |
| 53 | + int rv; |
| 54 | + |
| 55 | + spi_mux_control(1); |
| 56 | + |
| 57 | + rv = spi_flash_read((void *)¤t_flags, SPI_FLAGS_REGION, sizeof(current_flags)); |
| 58 | + if (rv != EC_SUCCESS) |
| 59 | + CPRINTS("Could not load flash storage"); |
| 60 | + |
| 61 | + spi_mux_control(0); |
| 62 | + |
| 63 | + /*Check structure is valid*/ |
| 64 | + if (check_flags_valid_header() == false) { |
| 65 | + CPRINTS("loading flash default flags"); |
| 66 | + flash_storage_load_defaults(); |
| 67 | + } |
| 68 | + |
| 69 | + return rv; |
| 70 | +} |
| 71 | + |
| 72 | +int flash_storage_update(enum ec_flash_flags_idx idx, uint8_t v) |
| 73 | +{ |
| 74 | + if (idx >= FLASH_FLAGS_MAX) |
| 75 | + return EC_ERROR_PARAM1; |
| 76 | + |
| 77 | + if (check_flags_valid_header() == false) |
| 78 | + flash_storage_initialize(); |
| 79 | + |
| 80 | + if (current_flags.flags[idx] != v) { |
| 81 | + current_flags.flags[idx] = v; |
| 82 | + flash_storage_dirty = true; |
| 83 | + } |
| 84 | + return EC_SUCCESS; |
| 85 | +} |
| 86 | + |
| 87 | +int flash_storage_commit(void) |
| 88 | +{ |
| 89 | + int rv = EC_SUCCESS; |
| 90 | + |
| 91 | + if (check_flags_valid_header() == false) |
| 92 | + flash_storage_initialize(); |
| 93 | + |
| 94 | + if (flash_storage_dirty) { |
| 95 | + |
| 96 | + spi_mux_control(1); |
| 97 | + |
| 98 | + rv = spi_flash_erase(SPI_FLAGS_REGION, 0x1000); |
| 99 | + |
| 100 | + if (rv != EC_SUCCESS) { |
| 101 | + CPRINTS("SPI fail to erase"); |
| 102 | + goto fail; |
| 103 | + } |
| 104 | + |
| 105 | + current_flags.update_number += 1; |
| 106 | + |
| 107 | + rv = spi_flash_write(SPI_FLAGS_REGION, |
| 108 | + sizeof(current_flags), |
| 109 | + (void *)¤t_flags); |
| 110 | + |
| 111 | + if (rv != EC_SUCCESS) { |
| 112 | + CPRINTS("SPI fail to write"); |
| 113 | + goto fail; |
| 114 | + } |
| 115 | + |
| 116 | + CPRINTS("%s, update:%d", __func__, current_flags.update_number); |
| 117 | + |
| 118 | + spi_mux_control(0); |
| 119 | + flash_storage_dirty = false; |
| 120 | + } |
| 121 | + |
| 122 | + return rv; |
| 123 | + |
| 124 | +fail: |
| 125 | + spi_mux_control(0); |
| 126 | + return rv; |
| 127 | +} |
| 128 | + |
| 129 | +int flash_storage_get(enum ec_flash_flags_idx idx) |
| 130 | +{ |
| 131 | + if (idx >= FLASH_FLAGS_MAX) |
| 132 | + return -1; |
| 133 | + |
| 134 | + if (check_flags_valid_header() == false) |
| 135 | + flash_storage_initialize(); |
| 136 | + |
| 137 | + return current_flags.flags[idx]; |
| 138 | +} |
| 139 | + |
| 140 | +static int cmd_flash_flags(int argc, char **argv) |
| 141 | +{ |
| 142 | + int data; |
| 143 | + int i, d; |
| 144 | + char *e; |
| 145 | + |
| 146 | + |
| 147 | + if (argc >= 3) { |
| 148 | + |
| 149 | + i = strtoi(argv[2], &e, 0); |
| 150 | + |
| 151 | + if (*e) |
| 152 | + return EC_ERROR_PARAM2; |
| 153 | + |
| 154 | + if (!strcasecmp(argv[1], "read")) { |
| 155 | + data = flash_storage_get(i); |
| 156 | + CPRINTS("Flash data:%d", data); |
| 157 | + } else if (argc >= 4 && !strcasecmp(argv[1], "write")) { |
| 158 | + |
| 159 | + d = strtoi(argv[3], &e, 0); |
| 160 | + if (*e) |
| 161 | + return EC_ERROR_PARAM3; |
| 162 | + flash_storage_update(i, d); |
| 163 | + flash_storage_commit(); |
| 164 | + } else { |
| 165 | + return EC_ERROR_PARAM3; |
| 166 | + } |
| 167 | + return EC_SUCCESS; |
| 168 | + } |
| 169 | + |
| 170 | + return EC_ERROR_PARAM2; |
| 171 | +} |
| 172 | +DECLARE_CONSOLE_COMMAND(flashflag, cmd_flash_flags, |
| 173 | + "[read/write] i [d]", |
| 174 | + "read or write bytes from flags structure"); |
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