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--- a/drivers/mtd/spi-nor/Kconfig
+++ b/drivers/mtd/spi-nor/Kconfig
@@ -28,4 +28,10 @@ config SPI_FSL_QUADSPI
This enables support for the Quad SPI controller in master mode.
We only connect the NOR to this controller now.
+config MTD_SPI_BCM53XXSPIFLASH
+ tristate "SPI-NOR flashes connected to the Broadcom ARM SoC"
+ depends on MTD_SPI_NOR
+ help
+ SPI driver for flashes used on Broadcom ARM SoCs.
+
endif # MTD_SPI_NOR
--- a/drivers/mtd/spi-nor/Makefile
+++ b/drivers/mtd/spi-nor/Makefile
@@ -1,2 +1,3 @@
obj-$(CONFIG_MTD_SPI_NOR) += spi-nor.o
obj-$(CONFIG_SPI_FSL_QUADSPI) += fsl-quadspi.o
+obj-$(CONFIG_MTD_SPI_BCM53XXSPIFLASH) += bcm53xxspiflash.o
--- /dev/null
+++ b/drivers/mtd/spi-nor/bcm53xxspiflash.c
@@ -0,0 +1,241 @@
+#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>
+
+static const char * const probes[] = { "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 struct spi_device_id *bcm53xxspiflash_read_id(struct spi_nor *nor)
+{
+ struct bcm53xxsf *b53sf = nor->priv;
+ struct device *dev = &b53sf->spi->dev;
+ const struct spi_device_id *id;
+ unsigned char cmd[4];
+ unsigned char resp[2];
+ char *name = NULL;
+ 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:
+ name = "w25q128";
+ break;
+ }
+ if (!name) {
+ dev_err(dev, "Unknown Winbond/NexFlash flash: %02X %02X\n",
+ resp[0], resp[1]);
+ return ERR_PTR(-ENOTSUPP);
+ }
+ goto found_name;
+ }
+
+ /* TODO: Try more ID commands */
+
+ return ERR_PTR(-ENODEV);
+
+found_name:
+// id = spi_nor_match_id(name);
+// if (!id) {
+// dev_err(dev, "No matching entry for %s flash\n", name);
+// return ERR_PTR(-ENOENT);
+// }
+
+ return id;
+}
+
+/**************************************************
+ * SPI driver
+ **************************************************/
+
+static int bcm53xxspiflash_probe(struct spi_device *spi)
+{
+ struct bcm53xxsf *b53sf;
+ int err;
+
+ b53sf = devm_kzalloc(&spi->dev, sizeof(*b53sf), GFP_KERNEL);
+ if (!b53sf)
+ return -ENOMEM;
+ spi_set_drvdata(spi, b53sf);
+
+ b53sf->spi = spi;
+
+ b53sf->mtd.priv = &b53sf->nor;
+
+ b53sf->nor.mtd = &b53sf->mtd;
+ b53sf->nor.dev = &spi->dev;
+ b53sf->nor.read_reg = bcm53xxspiflash_read_reg;
+ b53sf->nor.write_reg = bcm53xxspiflash_write_reg;
+ b53sf->nor.read = bcm53xxspiflash_read;
+ b53sf->nor.write = bcm53xxspiflash_write;
+ b53sf->nor.erase = bcm53xxspiflash_erase;
+ b53sf->nor.read_id = bcm53xxspiflash_read_id;
+ b53sf->nor.priv = b53sf;
+
+ err = spi_nor_scan(&b53sf->nor, "w25q128", SPI_NOR_NORMAL);
+ if (err)
+ return err;
+
+ err = mtd_device_parse_register(&b53sf->mtd, probes, NULL, 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);
|