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/*
* Copyright (C) 2014 Idwer Vollering <vidwer@gmail.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"
/* A25L-specific commands */
#define CMD_A25_WREN 0x06 /* Write Enable */
#define CMD_A25_WRDI 0x04 /* Write Disable */
#define CMD_A25_RDSR 0x05 /* Read Status Register */
#define CMD_A25_WRSR 0x01 /* Write Status Register */
#define CMD_A25_READ 0x03 /* Read Data Bytes */
#define CMD_A25_FAST_READ 0x0b /* Read Data Bytes at Higher Speed */
#define CMD_A25_PP 0x02 /* Page Program */
#define CMD_A25_SE 0x20 /* Sector (4K) Erase */
#define CMD_A25_BE 0xd8 /* Block (64K) Erase */
#define CMD_A25_CE 0xc7 /* Chip Erase */
#define CMD_A25_DP 0xb9 /* Deep Power-down */
#define CMD_A25_RES 0xab /* Release from DP, and Read Signature */
struct amic_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 amic_spi_flash {
struct spi_flash flash;
const struct amic_spi_flash_params *params;
};
static inline struct amic_spi_flash *
to_amic_spi_flash(struct spi_flash *flash)
{
return container_of(flash, struct amic_spi_flash, flash);
}
static const struct amic_spi_flash_params amic_spi_flash_table[] = {
{
.id = 0x3016,
.l2_page_size = 8,
.pages_per_sector = 16,
.sectors_per_block = 16,
.nr_blocks = 64,
.name = "A25L032",
},
};
static int amic_write(struct spi_flash *flash,
u32 offset, size_t len, const void *buf)
{
struct amic_spi_flash *amic = to_amic_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 << amic->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_A25_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_A25_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: AMIC 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: AMIC: 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 amic_erase(struct spi_flash *flash, u32 offset, size_t len)
{
return spi_flash_cmd_erase(flash, CMD_A25_SE, offset, len);
}
struct spi_flash *spi_flash_probe_amic(struct spi_slave *spi, u8 *idcode)
{
const struct amic_spi_flash_params *params;
unsigned page_size;
struct amic_spi_flash *amic;
unsigned int i;
for (i = 0; i < ARRAY_SIZE(amic_spi_flash_table); i++) {
params = &amic_spi_flash_table[i];
if (params->id == ((idcode[1] << 8) | idcode[2]))
break;
}
if (i == ARRAY_SIZE(amic_spi_flash_table)) {
printk(BIOS_WARNING, "SF: Unsupported AMIC ID %02x%02x\n",
idcode[1], idcode[2]);
return NULL;
}
amic = malloc(sizeof(struct amic_spi_flash));
if (!amic) {
printk(BIOS_WARNING, "SF: Failed to allocate memory\n");
return NULL;
}
amic->params = params;
amic->flash.spi = spi;
amic->flash.name = params->name;
/* Assuming power-of-two page size initially. */
page_size = 1 << params->l2_page_size;
amic->flash.write = amic_write;
amic->flash.erase = amic_erase;
#if CONFIG_SPI_FLASH_NO_FAST_READ
amic->flash.read = spi_flash_cmd_read_slow;
#else
amic->flash.read = spi_flash_cmd_read_fast;
#endif
amic->flash.sector_size = (1 << amic->params->l2_page_size) *
amic->params->pages_per_sector;
amic->flash.size = page_size * params->pages_per_sector
* params->sectors_per_block
* params->nr_blocks;
return &amic->flash;
}
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