2 * (C) Copyright 2010, ucRobotics Inc.
3 * Author: Chong Huang <chuang@ucrobotics.com>
4 * Licensed under the GPL-2 or later.
11 #include "spi_flash_internal.h"
13 /* EN25Q128-specific commands */
14 #define CMD_EN25Q128_WREN 0x06 /* Write Enable */
15 #define CMD_EN25Q128_WRDI 0x04 /* Write Disable */
16 #define CMD_EN25Q128_RDSR 0x05 /* Read Status Register */
17 #define CMD_EN25Q128_WRSR 0x01 /* Write Status Register */
18 #define CMD_EN25Q128_READ 0x03 /* Read Data Bytes */
19 #define CMD_EN25Q128_FAST_READ 0x0b /* Read Data Bytes at Higher Speed */
20 #define CMD_EN25Q128_PP 0x02 /* Page Program */
21 #define CMD_EN25Q128_SE 0x20 /* Sector Erase */
22 #define CMD_EN25Q128_BE 0xd8 /* Block Erase */
23 #define CMD_EN25Q128_DP 0xb9 /* Deep Power-down */
24 #define CMD_EN25Q128_RES 0xab /* Release from DP, and Read Signature */
26 #define EON_ID_EN25Q128 0x18
28 struct eon_spi_flash_params {
32 u16 sectors_per_block;
37 /* spi_flash needs to be first so upper layers can free() it */
38 struct eon_spi_flash {
39 struct spi_flash flash;
40 const struct eon_spi_flash_params *params;
43 static inline struct eon_spi_flash *to_eon_spi_flash(struct spi_flash *flash)
45 return container_of(flash, struct eon_spi_flash, flash);
48 static const struct eon_spi_flash_params eon_spi_flash_table[] = {
50 .idcode1 = EON_ID_EN25Q128,
52 .pages_per_sector = 16,
53 .sectors_per_block = 16,
59 static int eon_write(struct spi_flash *flash,
60 u32 offset, size_t len, const void *buf)
62 struct eon_spi_flash *eon = to_eon_spi_flash(flash);
63 unsigned long page_addr;
64 unsigned long byte_addr;
65 unsigned long page_size;
71 page_size = eon->params->page_size;
72 page_addr = offset / page_size;
73 byte_addr = offset % page_size;
75 ret = spi_claim_bus(flash->spi);
77 debug("SF: Unable to claim SPI bus\n");
82 for (actual = 0; actual < len; actual += chunk_len) {
83 chunk_len = min(len - actual, page_size - byte_addr);
85 cmd[0] = CMD_EN25Q128_PP;
86 cmd[1] = page_addr >> 8;
91 ("PP: 0x%p => cmd = { 0x%02x 0x%02x%02x%02x } chunk_len = %d\n",
92 buf + actual, cmd[0], cmd[1], cmd[2], cmd[3], chunk_len);
94 ret = spi_flash_cmd(flash->spi, CMD_EN25Q128_WREN, NULL, 0);
96 debug("SF: Enabling Write failed\n");
100 ret = spi_flash_cmd_write(flash->spi, cmd, 4,
101 buf + actual, chunk_len);
103 debug("SF: EON Page Program failed\n");
107 ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
115 debug("SF: EON: Successfully programmed %u bytes @ 0x%x\n",
118 spi_release_bus(flash->spi);
122 static int eon_erase(struct spi_flash *flash, u32 offset, size_t len)
124 return spi_flash_cmd_erase(flash, CMD_EN25Q128_BE, offset, len);
127 struct spi_flash *spi_flash_probe_eon(struct spi_slave *spi, u8 *idcode)
129 const struct eon_spi_flash_params *params;
130 struct eon_spi_flash *eon;
133 for (i = 0; i < ARRAY_SIZE(eon_spi_flash_table); ++i) {
134 params = &eon_spi_flash_table[i];
135 if (params->idcode1 == idcode[2])
139 if (i == ARRAY_SIZE(eon_spi_flash_table)) {
140 debug("SF: Unsupported EON ID %02x\n", idcode[1]);
144 eon = malloc(sizeof(*eon));
146 debug("SF: Failed to allocate memory\n");
150 eon->params = params;
151 eon->flash.spi = spi;
152 eon->flash.name = params->name;
154 eon->flash.write = eon_write;
155 eon->flash.erase = eon_erase;
156 eon->flash.read = spi_flash_cmd_read_fast;
157 eon->flash.sector_size = params->page_size * params->pages_per_sector
158 * params->sectors_per_block;
159 eon->flash.size = params->page_size * params->pages_per_sector
160 * params->nr_sectors;