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/*
* adesto.c
* Driver for Adesto Technologies SPI flash
* Copyright 2014 Orion Technologies, LLC
* Author: Chris Douglass <cdouglass <at> oriontechnologies.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 <console/console.h>
#include <stdlib.h>
#include <spi_flash.h>
#include <spi-generic.h>
#include "spi_flash_internal.h"
/* at25dfxx-specific commands */
#define CMD_AT25DF_WREN 0x06 /* Write Enable */
#define CMD_AT25DF_WRDI 0x04 /* Write Disable */
#define CMD_AT25DF_RDSR 0x05 /* Read Status Register */
#define CMD_AT25DF_WRSR 0x01 /* Write Status Register */
#define CMD_AT25DF_READ 0x03 /* Read Data Bytes */
#define CMD_AT25DF_FAST_READ 0x0b /* Read Data Bytes at Higher Speed */
#define CMD_AT25DF_PP 0x02 /* Page Program */
#define CMD_AT25DF_SE 0x20 /* Sector (4K) Erase */
#define CMD_AT25DF_BE 0xd8 /* Block (64K) Erase */
#define CMD_AT25DF_CE 0xc7 /* Chip Erase */
#define CMD_AT25DF_DP 0xb9 /* Deep Power-down */
#define CMD_AT25DF_RES 0xab /* Release from DP, and Read Signature */
struct adesto_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 adesto_spi_flash {
struct spi_flash flash;
const struct adesto_spi_flash_params *params;
};
static inline struct adesto_spi_flash *
to_adesto_spi_flash(const struct spi_flash *flash)
{
return container_of(flash, struct adesto_spi_flash, flash);
}
static const struct adesto_spi_flash_params adesto_spi_flash_table[] = {
{
.id = 0x4501,
.l2_page_size = 8,
.pages_per_sector = 16,
.sectors_per_block = 16,
.nr_blocks = 16,
.name = "AT25DF081",
},
{
.id = 0x4701,
.l2_page_size = 8,
.pages_per_sector = 16,
.sectors_per_block = 16,
.nr_blocks = 64,
.name = "AT25DF321",
},
{
.id = 0x4800,
.l2_page_size = 8,
.pages_per_sector = 16,
.sectors_per_block = 16,
.nr_blocks = 128,
.name = "AT25DF641",
},
};
static int adesto_write(const struct spi_flash *flash, u32 offset, size_t len,
const void *buf)
{
struct adesto_spi_flash *stm = to_adesto_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;
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_AT25DF_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_AT25DF_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: adesto 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: adesto: Successfully programmed %zu bytes @"
" 0x%lx\n", len, (unsigned long)(offset - len));
#endif
ret = 0;
out:
return ret;
}
struct spi_flash *spi_flash_probe_adesto(struct spi_slave *spi, u8 *idcode)
{
const struct adesto_spi_flash_params *params;
unsigned page_size;
struct adesto_spi_flash *stm;
unsigned int i;
for (i = 0; i < ARRAY_SIZE(adesto_spi_flash_table); i++) {
params = &adesto_spi_flash_table[i];
if (params->id == ((idcode[1] << 8) | idcode[2]))
break;
}
if (i == ARRAY_SIZE(adesto_spi_flash_table)) {
printk(BIOS_WARNING, "SF: Unsupported adesto ID %02x%02x\n",
idcode[1], idcode[2]);
return NULL;
}
stm = malloc(sizeof(struct adesto_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.internal_write = adesto_write;
stm->flash.internal_erase = spi_flash_cmd_erase;
#if CONFIG_SPI_FLASH_NO_FAST_READ
stm->flash.internal_read = spi_flash_cmd_read_slow;
#else
stm->flash.internal_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;
stm->flash.erase_cmd = CMD_AT25DF_SE;
return &stm->flash;
}
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