diff options
Diffstat (limited to 'target/linux/bcm53xx/files/drivers/mtd/spi-nor/bcm53xxspiflash.c')
| -rw-r--r-- | target/linux/bcm53xx/files/drivers/mtd/spi-nor/bcm53xxspiflash.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/target/linux/bcm53xx/files/drivers/mtd/spi-nor/bcm53xxspiflash.c b/target/linux/bcm53xx/files/drivers/mtd/spi-nor/bcm53xxspiflash.c new file mode 100644 index 0000000..954b9c5 --- /dev/null +++ b/target/linux/bcm53xx/files/drivers/mtd/spi-nor/bcm53xxspiflash.c @@ -0,0 +1,231 @@ +#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); |