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freifunkist-firmware/package/boot/uboot-lantiq/patches/0016-sf-add-MTD-layer-drive...

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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);
+}