Patrick Georgi | afd4c87 | 2020-05-05 23:43:18 +0200 | [diff] [blame] | 1 | /* Interface to SPI flash */ |
Patrick Georgi | ac95903 | 2020-05-05 22:49:26 +0200 | [diff] [blame] | 2 | /* SPDX-License-Identifier: GPL-2.0-only */ |
Stefan Reinauer | 1c56d9b | 2012-05-10 11:27:32 -0700 | [diff] [blame] | 3 | #ifndef _SPI_FLASH_H_ |
| 4 | #define _SPI_FLASH_H_ |
| 5 | |
| 6 | #include <stdint.h> |
| 7 | #include <stddef.h> |
Furquan Shaikh | 810e2cd | 2016-12-05 20:32:24 -0800 | [diff] [blame] | 8 | #include <spi-generic.h> |
Dan Ehrenberg | a5aac76 | 2015-01-08 10:29:19 -0800 | [diff] [blame] | 9 | #include <boot/coreboot_tables.h> |
Stefan Reinauer | 1c56d9b | 2012-05-10 11:27:32 -0700 | [diff] [blame] | 10 | |
Furquan Shaikh | 52896c6 | 2016-11-22 11:43:58 -0800 | [diff] [blame] | 11 | /* SPI Flash opcodes */ |
| 12 | #define SPI_OPCODE_WREN 0x06 |
| 13 | #define SPI_OPCODE_FAST_READ 0x0b |
| 14 | |
Furquan Shaikh | e2fc5e2 | 2017-05-17 17:26:01 -0700 | [diff] [blame] | 15 | struct spi_flash; |
| 16 | |
| 17 | /* |
Patrick Rudolph | e63a5f1 | 2018-03-12 11:34:53 +0100 | [diff] [blame] | 18 | * SPI write protection is enforced by locking the status register. |
| 19 | * The following modes are known. It depends on the flash chip if the |
| 20 | * mode is actually supported. |
| 21 | * |
| 22 | * PRESERVE : Keep the previous status register lock-down setting (noop) |
| 23 | * NONE : Status register isn't locked |
| 24 | * PIN : Status register is locked as long as the ~WP pin is active |
| 25 | * REBOOT : Status register is locked until power failure |
| 26 | * PERMANENT: Status register is permanently locked |
| 27 | */ |
| 28 | enum spi_flash_status_reg_lockdown { |
| 29 | SPI_WRITE_PROTECTION_PRESERVE = -1, |
| 30 | SPI_WRITE_PROTECTION_NONE = 0, |
| 31 | SPI_WRITE_PROTECTION_PIN, |
| 32 | SPI_WRITE_PROTECTION_REBOOT, |
| 33 | SPI_WRITE_PROTECTION_PERMANENT |
| 34 | }; |
| 35 | |
| 36 | /* |
Furquan Shaikh | e2fc5e2 | 2017-05-17 17:26:01 -0700 | [diff] [blame] | 37 | * Representation of SPI flash operations: |
| 38 | * read: Flash read operation. |
| 39 | * write: Flash write operation. |
| 40 | * erase: Flash erase operation. |
| 41 | * status: Read flash status register. |
| 42 | */ |
| 43 | struct spi_flash_ops { |
| 44 | int (*read)(const struct spi_flash *flash, u32 offset, size_t len, |
| 45 | void *buf); |
| 46 | int (*write)(const struct spi_flash *flash, u32 offset, size_t len, |
| 47 | const void *buf); |
| 48 | int (*erase)(const struct spi_flash *flash, u32 offset, size_t len); |
| 49 | int (*status)(const struct spi_flash *flash, u8 *reg); |
Aaron Durbin | f584f19 | 2020-01-11 14:03:27 -0700 | [diff] [blame] | 50 | }; |
| 51 | |
| 52 | /* Current code assumes all callbacks are supplied in this object. */ |
| 53 | struct spi_flash_protection_ops { |
Patrick Rudolph | 0f8bf02 | 2018-03-09 14:20:25 +0100 | [diff] [blame] | 54 | /* |
| 55 | * Returns 1 if the whole region is software write protected. |
| 56 | * Hardware write protection mechanism aren't accounted. |
| 57 | * If the write protection could be changed, due to unlocked status |
| 58 | * register for example, 0 should be returned. |
Patrick Rudolph | e63a5f1 | 2018-03-12 11:34:53 +0100 | [diff] [blame] | 59 | * Returns 0 on success. |
Patrick Rudolph | 0f8bf02 | 2018-03-09 14:20:25 +0100 | [diff] [blame] | 60 | */ |
Aaron Durbin | f584f19 | 2020-01-11 14:03:27 -0700 | [diff] [blame] | 61 | int (*get_write)(const struct spi_flash *flash, |
Patrick Rudolph | 0f8bf02 | 2018-03-09 14:20:25 +0100 | [diff] [blame] | 62 | const struct region *region); |
Patrick Rudolph | e63a5f1 | 2018-03-12 11:34:53 +0100 | [diff] [blame] | 63 | /* |
| 64 | * Enable the status register write protection, if supported on the |
| 65 | * requested region, and optionally enable status register lock-down. |
| 66 | * Returns 0 if the whole region was software write protected. |
| 67 | * Hardware write protection mechanism aren't accounted. |
| 68 | * If the status register is locked and the requested configuration |
| 69 | * doesn't match the selected one, return an error. |
| 70 | * Only a single region is supported ! |
| 71 | * |
| 72 | * @return 0 on success |
| 73 | */ |
| 74 | int |
Aaron Durbin | f584f19 | 2020-01-11 14:03:27 -0700 | [diff] [blame] | 75 | (*set_write)(const struct spi_flash *flash, |
Patrick Rudolph | e63a5f1 | 2018-03-12 11:34:53 +0100 | [diff] [blame] | 76 | const struct region *region, |
Patrick Rudolph | e63a5f1 | 2018-03-12 11:34:53 +0100 | [diff] [blame] | 77 | const enum spi_flash_status_reg_lockdown mode); |
Patrick Rudolph | 0f8bf02 | 2018-03-09 14:20:25 +0100 | [diff] [blame] | 78 | |
Furquan Shaikh | e2fc5e2 | 2017-05-17 17:26:01 -0700 | [diff] [blame] | 79 | }; |
| 80 | |
Aaron Durbin | 5abeb06 | 2020-01-12 15:12:18 -0700 | [diff] [blame] | 81 | struct spi_flash_part_id; |
| 82 | |
Stefan Reinauer | 1c56d9b | 2012-05-10 11:27:32 -0700 | [diff] [blame] | 83 | struct spi_flash { |
Furquan Shaikh | 810e2cd | 2016-12-05 20:32:24 -0800 | [diff] [blame] | 84 | struct spi_slave spi; |
Stefan Tauner | 630a418 | 2018-08-26 04:26:04 +0200 | [diff] [blame] | 85 | u8 vendor; |
Julius Werner | 99e45ce | 2019-06-06 17:03:44 -0700 | [diff] [blame] | 86 | union { |
| 87 | u8 raw; |
| 88 | struct { |
| 89 | u8 dual_spi : 1; |
| 90 | u8 _reserved : 7; |
| 91 | }; |
| 92 | } flags; |
Stefan Tauner | 630a418 | 2018-08-26 04:26:04 +0200 | [diff] [blame] | 93 | u16 model; |
Furquan Shaikh | c28984d | 2016-11-20 21:04:00 -0800 | [diff] [blame] | 94 | u32 size; |
| 95 | u32 sector_size; |
Furquan Shaikh | fc1a123 | 2017-05-12 00:19:56 -0700 | [diff] [blame] | 96 | u32 page_size; |
Furquan Shaikh | c28984d | 2016-11-20 21:04:00 -0800 | [diff] [blame] | 97 | u8 erase_cmd; |
| 98 | u8 status_cmd; |
Aaron Durbin | d701ef7 | 2019-12-27 15:16:17 -0700 | [diff] [blame] | 99 | u8 pp_cmd; /* Page program command. */ |
| 100 | u8 wren_cmd; /* Write Enable command. */ |
Furquan Shaikh | e2fc5e2 | 2017-05-17 17:26:01 -0700 | [diff] [blame] | 101 | const struct spi_flash_ops *ops; |
Aaron Durbin | f584f19 | 2020-01-11 14:03:27 -0700 | [diff] [blame] | 102 | /* If !NULL all protection callbacks exist. */ |
| 103 | const struct spi_flash_protection_ops *prot_ops; |
Aaron Durbin | 5abeb06 | 2020-01-12 15:12:18 -0700 | [diff] [blame] | 104 | const struct spi_flash_part_id *part; |
Stefan Reinauer | 1c56d9b | 2012-05-10 11:27:32 -0700 | [diff] [blame] | 105 | }; |
| 106 | |
Furquan Shaikh | c28984d | 2016-11-20 21:04:00 -0800 | [diff] [blame] | 107 | void lb_spi_flash(struct lb_header *header); |
| 108 | |
| 109 | /* SPI Flash Driver Public API */ |
Furquan Shaikh | 30221b4 | 2017-05-15 14:35:15 -0700 | [diff] [blame] | 110 | |
| 111 | /* |
| 112 | * Probe for SPI flash chip on given SPI bus and chip select and fill info in |
| 113 | * spi_flash structure. |
| 114 | * |
| 115 | * Params: |
| 116 | * bus = SPI Bus # for the flash chip |
| 117 | * cs = Chip select # for the flash chip |
| 118 | * flash = Pointer to spi flash structure that needs to be filled |
| 119 | * |
| 120 | * Return value: |
| 121 | * 0 = success |
| 122 | * non-zero = error |
| 123 | */ |
| 124 | int spi_flash_probe(unsigned int bus, unsigned int cs, struct spi_flash *flash); |
Furquan Shaikh | a149157 | 2017-05-17 19:14:06 -0700 | [diff] [blame] | 125 | |
Furquan Shaikh | d2fb6ae | 2016-11-17 20:38:07 -0800 | [diff] [blame] | 126 | /* |
Furquan Shaikh | a149157 | 2017-05-17 19:14:06 -0700 | [diff] [blame] | 127 | * Generic probing for SPI flash chip based on the different flashes provided. |
Furquan Shaikh | 30221b4 | 2017-05-15 14:35:15 -0700 | [diff] [blame] | 128 | * |
| 129 | * Params: |
Furquan Shaikh | a149157 | 2017-05-17 19:14:06 -0700 | [diff] [blame] | 130 | * spi = Pointer to spi_slave structure |
Furquan Shaikh | 30221b4 | 2017-05-15 14:35:15 -0700 | [diff] [blame] | 131 | * flash = Pointer to spi_flash structure that needs to be filled. |
| 132 | * |
| 133 | * Return value: |
Furquan Shaikh | a149157 | 2017-05-17 19:14:06 -0700 | [diff] [blame] | 134 | * 0 = success |
Furquan Shaikh | 30221b4 | 2017-05-15 14:35:15 -0700 | [diff] [blame] | 135 | * non-zero = error |
Furquan Shaikh | d2fb6ae | 2016-11-17 20:38:07 -0800 | [diff] [blame] | 136 | */ |
Furquan Shaikh | a149157 | 2017-05-17 19:14:06 -0700 | [diff] [blame] | 137 | int spi_flash_generic_probe(const struct spi_slave *slave, |
Furquan Shaikh | 30221b4 | 2017-05-15 14:35:15 -0700 | [diff] [blame] | 138 | struct spi_flash *flash); |
Stefan Reinauer | 1c56d9b | 2012-05-10 11:27:32 -0700 | [diff] [blame] | 139 | |
Furquan Shaikh | c28984d | 2016-11-20 21:04:00 -0800 | [diff] [blame] | 140 | /* All the following functions return 0 on success and non-zero on error. */ |
| 141 | int spi_flash_read(const struct spi_flash *flash, u32 offset, size_t len, |
| 142 | void *buf); |
| 143 | int spi_flash_write(const struct spi_flash *flash, u32 offset, size_t len, |
| 144 | const void *buf); |
| 145 | int spi_flash_erase(const struct spi_flash *flash, u32 offset, size_t len); |
| 146 | int spi_flash_status(const struct spi_flash *flash, u8 *reg); |
Patrick Rudolph | 0f8bf02 | 2018-03-09 14:20:25 +0100 | [diff] [blame] | 147 | |
| 148 | /* |
| 149 | * Return the vendor dependent SPI flash write protection state. |
| 150 | * @param flash : A SPI flash device |
| 151 | * @param region: A subregion of the device's region |
| 152 | * |
| 153 | * Returns: |
| 154 | * -1 on error |
| 155 | * 0 if the device doesn't support block protection |
| 156 | * 0 if the device doesn't enable block protection |
| 157 | * 0 if given range isn't covered by block protection |
| 158 | * 1 if given range is covered by block protection |
| 159 | */ |
| 160 | int spi_flash_is_write_protected(const struct spi_flash *flash, |
| 161 | const struct region *region); |
Furquan Shaikh | c28984d | 2016-11-20 21:04:00 -0800 | [diff] [blame] | 162 | /* |
Patrick Rudolph | e63a5f1 | 2018-03-12 11:34:53 +0100 | [diff] [blame] | 163 | * Enable the vendor dependent SPI flash write protection. The region not |
| 164 | * covered by write-protection will be set to write-able state. |
| 165 | * Only a single write-protected region is supported. |
| 166 | * Some flash ICs require the region to be aligned in the block size, sector |
| 167 | * size or page size. |
| 168 | * Some flash ICs require the region to start at TOP or BOTTOM. |
| 169 | * |
| 170 | * @param flash : A SPI flash device |
| 171 | * @param region: A subregion of the device's region |
Patrick Rudolph | e63a5f1 | 2018-03-12 11:34:53 +0100 | [diff] [blame] | 172 | * @param mode: Optional lock-down of status register |
| 173 | |
| 174 | * @return 0 on success |
| 175 | */ |
| 176 | int |
| 177 | spi_flash_set_write_protected(const struct spi_flash *flash, |
| 178 | const struct region *region, |
Patrick Rudolph | e63a5f1 | 2018-03-12 11:34:53 +0100 | [diff] [blame] | 179 | const enum spi_flash_status_reg_lockdown mode); |
| 180 | |
| 181 | /* |
Furquan Shaikh | c28984d | 2016-11-20 21:04:00 -0800 | [diff] [blame] | 182 | * Some SPI controllers require exclusive access to SPI flash when volatile |
| 183 | * operations like erase or write are being performed. In such cases, |
| 184 | * volatile_group_begin will gain exclusive access to SPI flash if not already |
| 185 | * acquired and volatile_group_end will end exclusive access if this was the |
| 186 | * last request in the group. spi_flash_{write,erase} operations call |
| 187 | * volatile_group_begin at the start of function and volatile_group_end after |
| 188 | * erase/write operation is performed. These functions can also be used by any |
| 189 | * components that wish to club multiple volatile operations into a single |
| 190 | * group. |
| 191 | */ |
| 192 | int spi_flash_volatile_group_begin(const struct spi_flash *flash); |
| 193 | int spi_flash_volatile_group_end(const struct spi_flash *flash); |
| 194 | |
| 195 | /* |
| 196 | * These are callbacks for marking the start and end of volatile group as |
| 197 | * handled by the chipset. Not every chipset requires this special handling. So, |
| 198 | * these functions are expected to be implemented in Kconfig option for volatile |
| 199 | * group is enabled (SPI_FLASH_HAS_VOLATILE_GROUP). |
| 200 | */ |
| 201 | int chipset_volatile_group_begin(const struct spi_flash *flash); |
| 202 | int chipset_volatile_group_end(const struct spi_flash *flash); |
Dan Ehrenberg | a5aac76 | 2015-01-08 10:29:19 -0800 | [diff] [blame] | 203 | |
Aaron Durbin | 305c0ca | 2016-12-03 17:04:06 -0600 | [diff] [blame] | 204 | /* Return spi_flash object reference for the boot device. This is only valid |
Martin Roth | f48acbd | 2020-07-24 12:24:27 -0600 | [diff] [blame] | 205 | * if CONFIG(BOOT_DEVICE_SPI_FLASH) is enabled. */ |
Aaron Durbin | 305c0ca | 2016-12-03 17:04:06 -0600 | [diff] [blame] | 206 | const struct spi_flash *boot_device_spi_flash(void); |
| 207 | |
Aaron Durbin | 10d65b0 | 2017-12-14 14:34:47 -0700 | [diff] [blame] | 208 | /* Protect a region of spi flash using its controller, if available. Returns |
| 209 | * < 0 on error, else 0 on success. */ |
| 210 | int spi_flash_ctrlr_protect_region(const struct spi_flash *flash, |
Rizwan Qureshi | f9f5093 | 2018-12-31 15:19:16 +0530 | [diff] [blame] | 211 | const struct region *region, |
| 212 | const enum ctrlr_prot_type type); |
Aaron Durbin | 10d65b0 | 2017-12-14 14:34:47 -0700 | [diff] [blame] | 213 | |
Aaron Durbin | 851dde8 | 2018-04-19 21:15:25 -0600 | [diff] [blame] | 214 | /* |
| 215 | * This function is provided to support spi flash command-response transactions. |
| 216 | * Only 2 vectors are supported and the 'func' is called with appropriate |
| 217 | * write and read buffers together. This can be used for chipsets that |
| 218 | * have specific spi flash controllers that don't conform to the normal |
| 219 | * spi xfer API because they are specialized controllers and not generic. |
| 220 | * |
| 221 | * Returns 0 on success and non-zero on failure. |
| 222 | */ |
| 223 | int spi_flash_vector_helper(const struct spi_slave *slave, |
| 224 | struct spi_op vectors[], size_t count, |
| 225 | int (*func)(const struct spi_slave *slave, const void *dout, |
| 226 | size_t bytesout, void *din, size_t bytesin)); |
| 227 | |
Furquan Shaikh | 493937e | 2020-11-25 17:15:09 -0800 | [diff] [blame] | 228 | /* |
| 229 | * Fill in the memory mapped windows used by the SPI flash device. This is useful for payloads |
| 230 | * to identify SPI flash to host space mapping. |
| 231 | * |
| 232 | * Returns number of windows added to the table. |
| 233 | */ |
| 234 | uint32_t spi_flash_get_mmap_windows(struct flash_mmap_window *table); |
| 235 | |
Stefan Reinauer | 1c56d9b | 2012-05-10 11:27:32 -0700 | [diff] [blame] | 236 | #endif /* _SPI_FLASH_H_ */ |