/* * (C) Copyright 2010, ucRobotics Inc. * Author: Chong Huang * Licensed under the GPL-2 or later. */ #include #include #include "spi_flash_internal.h" /* EN25Q128-specific commands */ #define CMD_EN25Q128_WREN 0x06 /* Write Enable */ #define CMD_EN25Q128_WRDI 0x04 /* Write Disable */ #define CMD_EN25Q128_RDSR 0x05 /* Read Status Register */ #define CMD_EN25Q128_WRSR 0x01 /* Write Status Register */ #define CMD_EN25Q128_READ 0x03 /* Read Data Bytes */ #define CMD_EN25Q128_FAST_READ 0x0b /* Read Data Bytes at Higher Speed */ #define CMD_EN25Q128_PP 0x02 /* Page Program */ #define CMD_EN25Q128_SE 0x20 /* Sector Erase */ #define CMD_EN25Q128_BE 0xd8 /* Block Erase */ #define CMD_EN25Q128_DP 0xb9 /* Deep Power-down */ #define CMD_EN25Q128_RES 0xab /* Release from DP, and Read Signature */ #define EON_ID_EN25Q128 0x18 struct eon_spi_flash_params { u8 idcode1; u16 page_size; u16 pages_per_sector; u16 sectors_per_block; u16 nr_sectors; const char *name; }; /* spi_flash needs to be first so upper layers can free() it */ struct eon_spi_flash { struct spi_flash flash; const struct eon_spi_flash_params *params; }; static inline struct eon_spi_flash *to_eon_spi_flash(struct spi_flash *flash) { return container_of(flash, struct eon_spi_flash, flash); } static const struct eon_spi_flash_params eon_spi_flash_table[] = { { .idcode1 = EON_ID_EN25Q128, .page_size = 256, .pages_per_sector = 16, .sectors_per_block = 16, .nr_sectors = 4096, .name = "EN25Q128", }, }; static int eon_write(struct spi_flash *flash, u32 offset, size_t len, const void *buf) { struct eon_spi_flash *eon = to_eon_spi_flash(flash); unsigned long page_addr; unsigned long byte_addr; unsigned long page_size; size_t chunk_len; size_t actual; int ret; u8 cmd[4]; page_size = eon->params->page_size; page_addr = offset / page_size; byte_addr = offset % page_size; ret = spi_claim_bus(flash->spi); if (ret) { printk(BIOS_WARNING, "SF: Unable to claim SPI bus\n"); return ret; } ret = 0; for (actual = 0; actual < len; actual += chunk_len) { chunk_len = min(len - actual, page_size - byte_addr); cmd[0] = CMD_EN25Q128_PP; cmd[1] = page_addr >> 8; cmd[2] = page_addr; cmd[3] = byte_addr; printk(BIOS_SPEW, "PP: 0x%p => cmd = { 0x%02x 0x%02x%02x%02x } chunk_len = %zd\n", buf + actual, cmd[0], cmd[1], cmd[2], cmd[3], chunk_len); ret = spi_flash_cmd(flash->spi, CMD_EN25Q128_WREN, NULL, 0); if (ret < 0) { printk(BIOS_WARNING, "SF: Enabling Write failed\n"); break; } ret = spi_flash_cmd_write(flash->spi, cmd, 4, buf + actual, chunk_len); if (ret < 0) { printk(BIOS_WARNING, "SF: EON Page Program failed\n"); break; } ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT); if (ret) break; page_addr++; byte_addr = 0; } printk(BIOS_INFO, "SF: EON: Successfully programmed %zu bytes @ 0x%x\n", len, offset); spi_release_bus(flash->spi); return ret; } static int eon_erase(struct spi_flash *flash, u32 offset, size_t len) { return spi_flash_cmd_erase(flash, CMD_EN25Q128_BE, offset, len); } struct spi_flash *spi_flash_probe_eon(struct spi_slave *spi, u8 *idcode) { const struct eon_spi_flash_params *params; struct eon_spi_flash *eon; unsigned int i; for (i = 0; i < ARRAY_SIZE(eon_spi_flash_table); ++i) { params = &eon_spi_flash_table[i]; if (params->idcode1 == idcode[2]) break; } if (i == ARRAY_SIZE(eon_spi_flash_table)) { printk(BIOS_WARNING, "SF: Unsupported EON ID %02x\n", idcode[1]); return NULL; } eon = malloc(sizeof(*eon)); if (!eon) { printk(BIOS_WARNING, "SF: Failed to allocate memory\n"); return NULL; } eon->params = params; eon->flash.spi = spi; eon->flash.name = params->name; eon->flash.write = eon_write; eon->flash.erase = eon_erase; eon->flash.read = spi_flash_cmd_read_fast; eon->flash.sector_size = params->page_size * params->pages_per_sector * params->sectors_per_block; eon->flash.size = params->page_size * params->pages_per_sector * params->nr_sectors; return &eon->flash; }