From 7f6ded11965b09daf6da44d4fa98da17b9fba36c Mon Sep 17 00:00:00 2001
From: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Date: Tue, 6 Nov 2012 19:41:26 +0100
Subject: sf: add MTD layer driver for SPI flash devices

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>

--- a/drivers/mtd/spi/Makefile
+++ b/drivers/mtd/spi/Makefile
@@ -30,6 +30,7 @@ COBJS-$(CONFIG_SPL_SPI_LOAD)	+= spi_spl_
 endif
 
 COBJS-$(CONFIG_SPI_FLASH)	+= spi_flash.o
+COBJS-$(CONFIG_SPI_FLASH_MTD)	+= spi_flash_mtd.o
 COBJS-$(CONFIG_SPI_FLASH_ATMEL)	+= atmel.o
 COBJS-$(CONFIG_SPI_FLASH_EON)	+= eon.o
 COBJS-$(CONFIG_SPI_FLASH_MACRONIX)	+= macronix.o
--- a/drivers/mtd/spi/spi_flash_internal.h
+++ b/drivers/mtd/spi/spi_flash_internal.h
@@ -122,6 +122,9 @@ static inline int spi_flash_set_4byte_mo
 }
 #endif
 
+/* SPI flash MTD adapter init */
+int spi_flash_mtd_init(struct spi_flash *flash);
+
 /* Manufacturer-specific probe functions */
 int spi_flash_probe_spansion(struct spi_flash *flash, u8 *idcode);
 int spi_flash_probe_atmel(struct spi_flash *flash, u8 *idcode);
--- /dev/null
+++ b/drivers/mtd/spi/spi_flash_mtd.c
@@ -0,0 +1,101 @@
+/*
+ * (C) Copyright 2012 Daniel Schwierzeck, daniel.schwierzeck@gmail.com
+ *
+ * MTD layer driver for SPI flash devices
+ *
+ * This file is released under the terms of GPL v2 and any later version.
+ * See the file COPYING in the root directory of the source tree for details.
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <asm/errno.h>
+#include <linux/mtd/mtd.h>
+#include <spi_flash.h>
+
+static struct mtd_info sf_mtd_info;
+static char sf_mtd_name[8];
+
+static int spi_flash_mtd_erase(struct mtd_info *mtd, struct erase_info *instr)
+{
+	struct spi_flash *flash = mtd->priv;
+	int err;
+
+	instr->state = MTD_ERASING;
+
+	err = spi_flash_erase(flash, instr->addr, instr->len);
+	if (err) {
+		instr->state = MTD_ERASE_FAILED;
+		instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN;
+		return -EIO;
+	}
+
+	instr->state = MTD_ERASE_DONE;
+	mtd_erase_callback(instr);
+
+	return 0;
+}
+
+static int spi_flash_mtd_read(struct mtd_info *mtd, loff_t from, size_t len,
+	size_t *retlen, u_char *buf)
+{
+	struct spi_flash *flash = mtd->priv;
+	int err;
+
+	err = spi_flash_read(flash, from, len, buf);
+	if (!err)
+		*retlen = len;
+
+	return err;
+}
+
+static int spi_flash_mtd_write(struct mtd_info *mtd, loff_t to, size_t len,
+	size_t *retlen, const u_char *buf)
+{
+	struct spi_flash *flash = mtd->priv;
+	int err;
+
+	err = spi_flash_write(flash, to, len, buf);
+	if (!err)
+		*retlen = len;
+
+	return err;
+}
+
+static void spi_flash_mtd_sync(struct mtd_info *mtd)
+{
+}
+
+static int spi_flash_mtd_number(void)
+{
+#ifdef CONFIG_SYS_MAX_FLASH_BANKS
+	return CONFIG_SYS_MAX_FLASH_BANKS;
+#else
+	return 0;
+#endif
+}
+
+int spi_flash_mtd_init(struct spi_flash *flash)
+{
+	memset(&sf_mtd_info, 0, sizeof(sf_mtd_info));
+	sprintf(sf_mtd_name, "nor%d", spi_flash_mtd_number());
+
+	sf_mtd_info.name = sf_mtd_name;
+	sf_mtd_info.type = MTD_NORFLASH;
+	sf_mtd_info.flags = MTD_CAP_NORFLASH;
+	sf_mtd_info.writesize = 1;
+
+	sf_mtd_info.erase = spi_flash_mtd_erase;
+	sf_mtd_info.read = spi_flash_mtd_read;
+	sf_mtd_info.write = spi_flash_mtd_write;
+	sf_mtd_info.sync = spi_flash_mtd_sync;
+
+	sf_mtd_info.size = flash->size;
+	sf_mtd_info.priv = flash;
+
+	/* Only uniform flash devices for now */
+	sf_mtd_info.numeraseregions = 0;
+	sf_mtd_info.erasesize = flash->sector_size;
+
+	return add_mtd_device(&sf_mtd_info);
+}