/* * Copyright 2008, Network Appliance Inc. * Copyright 2014, Sage Electronic Engineering, LLC. * * 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" /* M25Pxx-specific commands */ #define CMD_AT25_WREN 0x06 /* Write Enable */ #define CMD_AT25_WRDI 0x04 /* Write Disable */ #define CMD_AT25_RDSR 0x05 /* Read Status Register */ #define CMD_AT25_WRSR 0x01 /* Write Status Register */ #define CMD_AT25_READ 0x03 /* Read Data Bytes */ #define CMD_AT25_FAST_READ 0x0b /* Read Data Bytes at Higher Speed */ #define CMD_AT25_PP 0x02 /* Page Program */ #define CMD_AT25_SE 0x20 /* Sector (4K) Erase */ #define CMD_AT25_BE 0xd8 /* Block (64K) Erase */ #define CMD_AT25_CE 0xc7 /* Chip Erase */ #define CMD_AT25_DP 0xb9 /* Deep Power-down */ #define CMD_AT25_RES 0xab /* Release from DP, and Read Signature */ struct atmel_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 atmel_spi_flash { struct spi_flash flash; const struct atmel_spi_flash_params *params; }; static inline struct atmel_spi_flash * to_atmel_spi_flash(struct spi_flash *flash) { return container_of(flash, struct atmel_spi_flash, flash); } static const struct atmel_spi_flash_params atmel_spi_flash_table[] = { { .id = 0x3015, .l2_page_size = 8, .pages_per_sector = 16, .sectors_per_block = 16, .nr_blocks = 32, .name = "AT25X16", }, { .id = 0x47, .l2_page_size = 8, .pages_per_sector = 16, .sectors_per_block = 16, .nr_blocks = 64, .name = "AT25DF32", }, { .id = 0x3017, .l2_page_size = 8, .pages_per_sector = 16, .sectors_per_block = 16, .nr_blocks = 128, .name = "AT25X64", }, { .id = 0x4015, .l2_page_size = 8, .pages_per_sector = 16, .sectors_per_block = 16, .nr_blocks = 32, .name = "AT25Q16", }, { .id = 0x4016, .l2_page_size = 8, .pages_per_sector = 16, .sectors_per_block = 16, .nr_blocks = 64, .name = "AT25Q32", }, { .id = 0x4017, .l2_page_size = 8, .pages_per_sector = 16, .sectors_per_block = 16, .nr_blocks = 128, .name = "AT25Q64", }, { .id = 0x4018, .l2_page_size = 8, .pages_per_sector = 16, .sectors_per_block = 16, .nr_blocks = 256, .name = "AT25Q128", }, }; static int atmel_write(struct spi_flash *flash, u32 offset, size_t len, const void *buf) { struct atmel_spi_flash *stm = to_atmel_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 = 1 << stm->params->l2_page_size; 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); chunk_len = spi_crop_chunk(sizeof(cmd), chunk_len); cmd[0] = CMD_AT25_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_AT25_WREN, NULL, 0); if (ret < 0) { printk(BIOS_WARNING, "SF: Enabling Write failed\n"); goto out; } ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd), buf + actual, chunk_len); if (ret < 0) { printk(BIOS_WARNING, "SF: Atmel 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: Atmel: 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 atmel_erase(struct spi_flash *flash, u32 offset, size_t len) { return spi_flash_cmd_erase(flash, CMD_AT25_SE, offset, len); } struct spi_flash *spi_flash_probe_atmel(struct spi_slave *spi, u8 *idcode) { const struct atmel_spi_flash_params *params; unsigned page_size; struct atmel_spi_flash *stm; unsigned int i; for (i = 0; i < ARRAY_SIZE(atmel_spi_flash_table); i++) { params = &atmel_spi_flash_table[i]; if (params->id == ((idcode[1] << 8) | idcode[2])) break; } if (i == ARRAY_SIZE(atmel_spi_flash_table)) { printk(BIOS_WARNING, "SF: Unsupported Atmel ID %02x%02x\n", idcode[1], idcode[2]); return NULL; } stm = malloc(sizeof(struct atmel_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 = atmel_write; stm->flash.erase = atmel_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; }