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#include <linux/module.h>
#include <linux/delay.h>
#include <linux/spi/spi.h>
#include <linux/mtd/spi-nor.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/cfi.h>
#include <linux/mtd/partitions.h>
static const char * const probes[] = { "ofpart", "bcm47xxpart", NULL };
struct bcm53xxsf {
struct spi_device *spi;
struct mtd_info mtd;
struct spi_nor nor;
};
/**************************************************
* spi-nor API
**************************************************/
static int bcm53xxspiflash_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
int len)
{
struct bcm53xxsf *b53sf = nor->priv;
return spi_write_then_read(b53sf->spi, &opcode, 1, buf, len);
}
static int bcm53xxspiflash_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
int len, int write_enable)
{
struct bcm53xxsf *b53sf = nor->priv;
u8 *cmd = kzalloc(len + 1, GFP_KERNEL);
int err;
if (!cmd)
return -ENOMEM;
cmd[0] = opcode;
memcpy(&cmd[1], buf, len);
err = spi_write(b53sf->spi, cmd, len + 1);
kfree(cmd);
return err;
}
static int bcm53xxspiflash_read(struct spi_nor *nor, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
struct bcm53xxsf *b53sf = nor->priv;
struct spi_message m;
struct spi_transfer t[2] = { { 0 }, { 0 } };
unsigned char cmd[5];
int cmd_len = 0;
int err;
spi_message_init(&m);
cmd[cmd_len++] = SPINOR_OP_READ;
if (b53sf->mtd.size > 0x1000000)
cmd[cmd_len++] = (from & 0xFF000000) >> 24;
cmd[cmd_len++] = (from & 0x00FF0000) >> 16;
cmd[cmd_len++] = (from & 0x0000FF00) >> 8;
cmd[cmd_len++] = (from & 0x000000FF) >> 0;
t[0].tx_buf = cmd;
t[0].len = cmd_len;
spi_message_add_tail(&t[0], &m);
t[1].rx_buf = buf;
t[1].len = len;
spi_message_add_tail(&t[1], &m);
err = spi_sync(b53sf->spi, &m);
if (err)
return err;
if (retlen && m.actual_length > cmd_len)
*retlen = m.actual_length - cmd_len;
return 0;
}
static void bcm53xxspiflash_write(struct spi_nor *nor, loff_t to, size_t len,
size_t *retlen, const u_char *buf)
{
struct bcm53xxsf *b53sf = nor->priv;
struct spi_message m;
struct spi_transfer t = { 0 };
u8 *cmd = kzalloc(len + 5, GFP_KERNEL);
int cmd_len = 0;
int err;
if (!cmd)
return;
spi_message_init(&m);
cmd[cmd_len++] = nor->program_opcode;
if (b53sf->mtd.size > 0x1000000)
cmd[cmd_len++] = (to & 0xFF000000) >> 24;
cmd[cmd_len++] = (to & 0x00FF0000) >> 16;
cmd[cmd_len++] = (to & 0x0000FF00) >> 8;
cmd[cmd_len++] = (to & 0x000000FF) >> 0;
memcpy(&cmd[cmd_len], buf, len);
t.tx_buf = cmd;
t.len = cmd_len + len;
spi_message_add_tail(&t, &m);
err = spi_sync(b53sf->spi, &m);
if (err)
goto out;
if (retlen && m.actual_length > cmd_len)
*retlen += m.actual_length - cmd_len;
out:
kfree(cmd);
}
static int bcm53xxspiflash_erase(struct spi_nor *nor, loff_t offs)
{
struct bcm53xxsf *b53sf = nor->priv;
unsigned char cmd[5];
int i;
i = 0;
cmd[i++] = nor->erase_opcode;
if (b53sf->mtd.size > 0x1000000)
cmd[i++] = (offs & 0xFF000000) >> 24;
cmd[i++] = ((offs & 0x00FF0000) >> 16);
cmd[i++] = ((offs & 0x0000FF00) >> 8);
cmd[i++] = ((offs & 0x000000FF) >> 0);
return spi_write(b53sf->spi, cmd, i);
}
static const char *bcm53xxspiflash_chip_name(struct spi_nor *nor)
{
struct bcm53xxsf *b53sf = nor->priv;
struct device *dev = &b53sf->spi->dev;
unsigned char cmd[4];
unsigned char resp[2];
int err;
/* SST and Winbond/NexFlash specific command */
cmd[0] = 0x90; /* Read Manufacturer / Device ID */
cmd[1] = 0;
cmd[2] = 0;
cmd[3] = 0;
err = spi_write_then_read(b53sf->spi, cmd, 4, resp, 2);
if (err < 0) {
dev_err(dev, "error reading SPI flash id\n");
return ERR_PTR(-EBUSY);
}
switch (resp[0]) {
case 0xef: /* Winbond/NexFlash */
switch (resp[1]) {
case 0x17:
return "w25q128";
}
dev_err(dev, "Unknown Winbond/NexFlash flash: %02X %02X\n",
resp[0], resp[1]);
return NULL;
}
/* TODO: Try more ID commands */
return NULL;
}
/**************************************************
* SPI driver
**************************************************/
static int bcm53xxspiflash_probe(struct spi_device *spi)
{
struct mtd_part_parser_data parser_data = {};
struct bcm53xxsf *b53sf;
struct spi_nor *nor;
int err;
b53sf = devm_kzalloc(&spi->dev, sizeof(*b53sf), GFP_KERNEL);
if (!b53sf)
return -ENOMEM;
spi_set_drvdata(spi, b53sf);
nor = &b53sf->nor;
b53sf->spi = spi;
b53sf->mtd.priv = &b53sf->nor;
nor->mtd = &b53sf->mtd;
nor->dev = &spi->dev;
nor->read_reg = bcm53xxspiflash_read_reg;
nor->write_reg = bcm53xxspiflash_write_reg;
nor->read = bcm53xxspiflash_read;
nor->write = bcm53xxspiflash_write;
nor->erase = bcm53xxspiflash_erase;
nor->priv = b53sf;
err = spi_nor_scan(&b53sf->nor, bcm53xxspiflash_chip_name(nor),
SPI_NOR_NORMAL);
if (err)
return err;
parser_data.of_node = spi->master->dev.parent->of_node;
err = mtd_device_parse_register(&b53sf->mtd, probes, &parser_data,
NULL, 0);
if (err)
return err;
return 0;
}
static int bcm53xxspiflash_remove(struct spi_device *spi)
{
return 0;
}
static struct spi_driver bcm53xxspiflash_driver = {
.driver = {
.name = "bcm53xxspiflash",
.owner = THIS_MODULE,
},
.probe = bcm53xxspiflash_probe,
.remove = bcm53xxspiflash_remove,
};
module_spi_driver(bcm53xxspiflash_driver);
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