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/*
* (C) Copyright 2010, ucRobotics Inc.
* Copyright (c) 2014, Sage Electronic Engineering, LLC
* .
* Author: Chong Huang <chuang@ucrobotics.com>
* Licensed under the GPL-2 or later.
*/
#include <stdlib.h>
#include <spi_flash.h>
#include "spi_flash_internal.h"
/* EN25*-specific commands */
#define CMD_EN25_WREN 0x06 /* Write Enable */
#define CMD_EN25_WRDI 0x04 /* Write Disable */
#define CMD_EN25_RDSR 0x05 /* Read Status Register */
#define CMD_EN25_WRSR 0x01 /* Write Status Register */
#define CMD_EN25_READ 0x03 /* Read Data Bytes */
#define CMD_EN25_FAST_READ 0x0b /* Read Data Bytes at Higher Speed */
#define CMD_EN25_PP 0x02 /* Page Program */
#define CMD_EN25_SE 0x20 /* Sector Erase */
#define CMD_EN25_BE 0xd8 /* Block Erase */
#define CMD_EN25_DP 0xb9 /* Deep Power-down */
#define CMD_EN25_RES 0xab /* Release from DP, and Read Signature */
#define EON_ID_EN25Q128 0x3018
#define EON_ID_EN25Q64 0x3017
#define EON_ID_EN25S64 0x3817
struct eon_spi_flash_params {
u16 id;
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[] = {
{
.id = EON_ID_EN25Q128,
.page_size = 256,
.pages_per_sector = 16,
.sectors_per_block = 16,
.nr_sectors = 4096,
.name = "EN25Q128",
},
{
.id = EON_ID_EN25Q64,
.page_size = 256,
.pages_per_sector = 16,
.sectors_per_block = 16,
.nr_sectors = 2048,
.name = "EN25Q64",
},
{
.id = EON_ID_EN25S64,
.page_size = 256,
.pages_per_sector = 16,
.sectors_per_block = 16,
.nr_sectors = 2048,
.name = "EN25S64",
},
};
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 byte_addr;
unsigned long page_size;
size_t chunk_len;
size_t actual;
int ret = 0;
u8 cmd[4];
page_size = 1 << eon->params->page_size;
byte_addr = offset % page_size;
flash->spi->rw = SPI_WRITE_FLAG;
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);
ret = spi_flash_cmd(flash->spi, CMD_EN25_WREN, NULL, 0);
if (ret < 0) {
printk(BIOS_WARNING, "SF: Enabling Write failed\n");
goto out;
}
cmd[0] = CMD_EN25_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_write(flash->spi, cmd, sizeof(cmd),
buf + actual, chunk_len);
if (ret < 0) {
printk(BIOS_WARNING, "SF: EON Page Program failed\n");
goto out;
}
ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
if (ret) {
printk(BIOS_WARNING, "SF: EON Page Program timeout\n");
goto out;
}
offset += chunk_len;
byte_addr = 0;
}
#if CONFIG_DEBUG_SPI_FLASH
printk(BIOS_SPEW, "SF: EON: Successfully programmed %zu bytes @ %#x\n",
len, (unsigned int)(offset - len));
#endif
out:
return ret;
}
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->id == ((idcode[1] << 8) | idcode[2]))
break;
}
if (i == ARRAY_SIZE(eon_spi_flash_table)) {
printk(BIOS_WARNING, "SF: Unsupported EON ID %#02x%02x\n",
idcode[1], idcode[2]);
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 = spi_flash_cmd_erase;
eon->flash.read = spi_flash_cmd_read_fast;
eon->flash.sector_size = params->page_size * params->pages_per_sector;
eon->flash.size = params->page_size * params->pages_per_sector
* params->nr_sectors;
eon->flash.erase_cmd = CMD_EN25_SE;
return &eon->flash;
}
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