path: root/target/linux/bcm53xx/patches-3.14/404-mtd-bcm53xxspiflash-new-driver-for-SPI-flahes-on-Bro.patch

--- 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, NULL, 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);