| /* |
| * adesto.c |
| * Driver for Adesto Technologies SPI flash |
| * Copyright 2014 Orion Technologies, LLC |
| * Author: Chris Douglass <cdouglass <at> oriontechnologies.com> |
| * |
| * based on winbond.c |
| * Copyright 2008, Network Appliance Inc. |
| * Author: Jason McMullan <mcmullan <at> netapp.com> |
| * Licensed under the GPL-2 or later. |
| */ |
| |
| #include <stdlib.h> |
| #include <spi_flash.h> |
| #include "spi_flash_internal.h" |
| |
| /* at25dfxx-specific commands */ |
| #define CMD_AT25DF_WREN 0x06 /* Write Enable */ |
| #define CMD_AT25DF_WRDI 0x04 /* Write Disable */ |
| #define CMD_AT25DF_RDSR 0x05 /* Read Status Register */ |
| #define CMD_AT25DF_WRSR 0x01 /* Write Status Register */ |
| #define CMD_AT25DF_READ 0x03 /* Read Data Bytes */ |
| #define CMD_AT25DF_FAST_READ 0x0b /* Read Data Bytes at Higher Speed */ |
| #define CMD_AT25DF_PP 0x02 /* Page Program */ |
| #define CMD_AT25DF_SE 0x20 /* Sector (4K) Erase */ |
| #define CMD_AT25DF_BE 0xd8 /* Block (64K) Erase */ |
| #define CMD_AT25DF_CE 0xc7 /* Chip Erase */ |
| #define CMD_AT25DF_DP 0xb9 /* Deep Power-down */ |
| #define CMD_AT25DF_RES 0xab /* Release from DP, and Read Signature */ |
| |
| struct adesto_spi_flash_params { |
| uint16_t id; |
| /* Log2 of page size in power-of-two mode */ |
| uint8_t l2_page_size; |
| uint16_t pages_per_sector; |
| uint16_t sectors_per_block; |
| uint16_t nr_blocks; |
| const char *name; |
| }; |
| |
| /* spi_flash needs to be first so upper layers can free() it */ |
| struct adesto_spi_flash { |
| struct spi_flash flash; |
| const struct adesto_spi_flash_params *params; |
| }; |
| |
| static inline struct adesto_spi_flash * |
| to_adesto_spi_flash(struct spi_flash *flash) |
| { |
| return container_of(flash, struct adesto_spi_flash, flash); |
| } |
| |
| static const struct adesto_spi_flash_params adesto_spi_flash_table[] = { |
| { |
| .id = 0x4501, |
| .l2_page_size = 8, |
| .pages_per_sector = 16, |
| .sectors_per_block = 16, |
| .nr_blocks = 16, |
| .name = "AT25DF081", |
| }, |
| { |
| .id = 0x4701, |
| .l2_page_size = 8, |
| .pages_per_sector = 16, |
| .sectors_per_block = 16, |
| .nr_blocks = 64, |
| .name = "AT25DF321", |
| }, |
| { |
| .id = 0x4800, |
| .l2_page_size = 8, |
| .pages_per_sector = 16, |
| .sectors_per_block = 16, |
| .nr_blocks = 128, |
| .name = "AT25DF641", |
| }, |
| }; |
| |
| static int adesto_write(struct spi_flash *flash, |
| u32 offset, size_t len, const void *buf) |
| { |
| struct adesto_spi_flash *stm = to_adesto_spi_flash(flash); |
| unsigned long byte_addr; |
| unsigned long page_size; |
| size_t chunk_len; |
| size_t actual; |
| int ret; |
| u8 cmd[4]; |
| |
| page_size = min(1 << stm->params->l2_page_size, CONTROLLER_PAGE_LIMIT); |
| byte_addr = offset % page_size; |
| |
| flash->spi->rw = SPI_WRITE_FLAG; |
| ret = spi_claim_bus(flash->spi); |
| if (ret) { |
| printk(BIOS_WARNING, "SF: Unable to claim SPI bus\n"); |
| return ret; |
| } |
| |
| for (actual = 0; actual < len; actual += chunk_len) { |
| chunk_len = min(len - actual, page_size - byte_addr); |
| |
| cmd[0] = CMD_AT25DF_PP; |
| cmd[1] = (offset >> 16) & 0xff; |
| cmd[2] = (offset >> 8) & 0xff; |
| cmd[3] = offset & 0xff; |
| #if CONFIG_DEBUG_SPI_FLASH |
| printk(BIOS_SPEW, "PP: 0x%p => cmd = { 0x%02x 0x%02x%02x%02x }" |
| " chunk_len = %zu\n", buf + actual, |
| cmd[0], cmd[1], cmd[2], cmd[3], chunk_len); |
| #endif |
| |
| ret = spi_flash_cmd(flash->spi, CMD_AT25DF_WREN, NULL, 0); |
| if (ret < 0) { |
| printk(BIOS_WARNING, "SF: Enabling Write failed\n"); |
| goto out; |
| } |
| |
| ret = spi_flash_cmd_write(flash->spi, cmd, 4, |
| buf + actual, chunk_len); |
| if (ret < 0) { |
| printk(BIOS_WARNING, "SF: adesto Page Program failed\n"); |
| goto out; |
| } |
| |
| ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT); |
| if (ret) |
| goto out; |
| |
| offset += chunk_len; |
| byte_addr = 0; |
| } |
| |
| #if CONFIG_DEBUG_SPI_FLASH |
| printk(BIOS_SPEW, "SF: adesto: Successfully programmed %zu bytes @" |
| " 0x%lx\n", len, (unsigned long)(offset - len)); |
| #endif |
| ret = 0; |
| |
| out: |
| spi_release_bus(flash->spi); |
| return ret; |
| } |
| |
| static int adesto_erase(struct spi_flash *flash, u32 offset, size_t len) |
| { |
| return spi_flash_cmd_erase(flash, CMD_AT25DF_SE, offset, len); |
| } |
| |
| struct spi_flash *spi_flash_probe_adesto(struct spi_slave *spi, u8 *idcode) |
| { |
| const struct adesto_spi_flash_params *params; |
| unsigned page_size; |
| struct adesto_spi_flash *stm; |
| unsigned int i; |
| |
| for (i = 0; i < ARRAY_SIZE(adesto_spi_flash_table); i++) { |
| params = &adesto_spi_flash_table[i]; |
| if (params->id == ((idcode[1] << 8) | idcode[2])) |
| break; |
| } |
| |
| if (i == ARRAY_SIZE(adesto_spi_flash_table)) { |
| printk(BIOS_WARNING, "SF: Unsupported adesto ID %02x%02x\n", |
| idcode[1], idcode[2]); |
| return NULL; |
| } |
| |
| stm = malloc(sizeof(struct adesto_spi_flash)); |
| if (!stm) { |
| printk(BIOS_WARNING, "SF: Failed to allocate memory\n"); |
| return NULL; |
| } |
| |
| stm->params = params; |
| stm->flash.spi = spi; |
| stm->flash.name = params->name; |
| |
| /* Assuming power-of-two page size initially. */ |
| page_size = 1 << params->l2_page_size; |
| |
| stm->flash.write = adesto_write; |
| stm->flash.erase = adesto_erase; |
| #if CONFIG_SPI_FLASH_NO_FAST_READ |
| stm->flash.read = spi_flash_cmd_read_slow; |
| #else |
| stm->flash.read = spi_flash_cmd_read_fast; |
| #endif |
| stm->flash.sector_size = (1 << stm->params->l2_page_size) * |
| stm->params->pages_per_sector; |
| stm->flash.size = page_size * params->pages_per_sector |
| * params->sectors_per_block |
| * params->nr_blocks; |
| |
| return &stm->flash; |
| } |