openwrt/target/linux/brcm47xx/patches-3.2/027-mtd-bcm47xx-add-serial-flash-driver.patch

From 2e2951220bf63e05449c03a95453680da1029e44 Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Sun, 17 Jul 2011 14:55:45 +0200
Subject: [PATCH 08/15] mtd: bcm47xx: add serial flash driver

sflash get the sflash ops from platform device

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
 arch/mips/include/asm/mach-bcm47xx/bus.h |    3 +
 drivers/mtd/maps/Kconfig                 |    9 +
 drivers/mtd/maps/Makefile                |    1 +
 drivers/mtd/maps/bcm47xx-sflash.c        |  252 ++++++++++++++++++++++++++++++
 4 files changed, 265 insertions(+), 0 deletions(-)
 create mode 100644 drivers/mtd/maps/bcm47xx-sflash.c

--- a/arch/mips/include/asm/mach-bcm47xx/bus.h
+++ b/arch/mips/include/asm/mach-bcm47xx/bus.h
@@ -11,6 +11,7 @@
 
 #include <linux/ssb/ssb.h>
 #include <linux/bcma/bcma.h>
+#include <linux/mtd/mtd.h>
 #include <bcm47xx.h>
 
 struct bcm47xx_sflash {
@@ -29,6 +30,8 @@ struct bcm47xx_sflash {
 	u32 blocksize;		/* Block size */
 	u32 numblocks;		/* Number of blocks */
 	u32 size;		/* Total size in bytes */
+
+	struct mtd_info *mtd;
 };
 
 void bcm47xx_sflash_struct_bcma_init(struct bcm47xx_sflash *sflash, struct bcma_drv_cc *bcc);
--- a/drivers/mtd/maps/Kconfig
+++ b/drivers/mtd/maps/Kconfig
@@ -266,6 +266,15 @@ config MTD_BCM47XX_PFLASH
 	help
 	  Support for bcm47xx parallel flash
 
+config MTD_BCM47XX_SFLASH
+	tristate "bcm47xx serial flash support"
+	default y
+	depends on BCM47XX
+	select MTD_PARTITIONS
+	select MTD_BCM47XX_PARTS
+	help
+	  Support for bcm47xx parallel flash
+
 config MTD_DILNETPC
 	tristate "CFI Flash device mapped on DIL/Net PC"
 	depends on X86 && MTD_CFI_INTELEXT && BROKEN
--- a/drivers/mtd/maps/Makefile
+++ b/drivers/mtd/maps/Makefile
@@ -59,3 +59,4 @@ obj-$(CONFIG_MTD_BCM963XX)	+= bcm963xx-f
 obj-$(CONFIG_MTD_LATCH_ADDR)	+= latch-addr-flash.o
 obj-$(CONFIG_MTD_LANTIQ)	+= lantiq-flash.o
 obj-$(CONFIG_MTD_BCM47XX_PFLASH)+= bcm47xx-pflash.o
+obj-$(CONFIG_MTD_BCM47XX_SFLASH)+= bcm47xx-sflash.o
--- /dev/null
+++ b/drivers/mtd/maps/bcm47xx-sflash.c
@@ -0,0 +1,252 @@
+/*
+ * Broadcom SiliconBackplane chipcommon serial flash interface
+ *
+ * Copyright 2006, Broadcom Corporation
+ * All Rights Reserved.
+ *
+ * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
+ * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
+ * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
+ *
+ * $Id$
+ */
+
+#define pr_fmt(fmt) "bcm47xx_sflash: " fmt
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/sched.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <bcm47xx.h>
+#include <bus.h>
+
+static int
+sflash_mtd_poll(struct bcm47xx_sflash *sflash, unsigned int offset, int timeout)
+{
+	unsigned long now = jiffies;
+	int ret = 0;
+
+	for (;;) {
+		if (!sflash->poll(sflash, offset)) {
+			ret = 0;
+			break;
+		}
+		if (time_after(jiffies, now + timeout)) {
+			pr_err("timeout while polling\n");
+			ret = -ETIMEDOUT;
+			break;
+		}
+		udelay(1);
+	}
+
+	return ret;
+}
+
+static int
+sflash_mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
+{
+	struct bcm47xx_sflash *sflash = (struct bcm47xx_sflash *) mtd->priv;
+
+	/* Check address range */
+	if (!len)
+		return 0;
+
+	if ((from + len) > mtd->size)
+		return -EINVAL;
+
+	*retlen = 0;
+
+	while (len) {
+		int ret = sflash->read(sflash, from, len, buf);
+		if (ret < 0)
+			return ret;
+
+		from += (loff_t) ret;
+		len -= ret;
+		buf += ret;
+		*retlen += ret;
+	}
+
+	return 0;
+}
+
+static int
+sflash_mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf)
+{
+	struct bcm47xx_sflash *sflash = (struct bcm47xx_sflash *) mtd->priv;
+
+	/* Check address range */
+	if (!len)
+		return 0;
+
+	if ((to + len) > mtd->size)
+		return -EINVAL;
+
+	*retlen = 0;
+	while (len) {
+		int bytes;
+		int ret = sflash->write(sflash, to, len, buf);
+		if (ret < 0)
+			return ret;
+
+		bytes = ret;
+
+		ret = sflash_mtd_poll(sflash, (unsigned int) to, HZ / 10);
+		if (ret)
+			return ret;
+
+		to += (loff_t) bytes;
+		len -= bytes;
+		buf += bytes;
+		*retlen += bytes;
+	}
+
+	return 0;
+}
+
+static int
+sflash_mtd_erase(struct mtd_info *mtd, struct erase_info *erase)
+{
+	struct bcm47xx_sflash *sflash = (struct bcm47xx_sflash *) mtd->priv;
+	int i, j, ret = 0;
+	unsigned int addr, len;
+
+	/* Check address range */
+	if (!erase->len)
+		return 0;
+	if ((erase->addr + erase->len) > mtd->size)
+		return -EINVAL;
+
+	addr = erase->addr;
+	len = erase->len;
+
+	/* Ensure that requested regions are aligned */
+	for (i = 0; i < mtd->numeraseregions; i++) {
+		for (j = 0; j < mtd->eraseregions[i].numblocks; j++) {
+			if (addr == mtd->eraseregions[i].offset +
+					mtd->eraseregions[i].erasesize * j &&
+			    len >= mtd->eraseregions[i].erasesize) {
+				ret = sflash->erase(sflash, addr);
+				if (ret < 0)
+					break;
+				ret = sflash_mtd_poll(sflash, addr, 10 * HZ);
+				if (ret)
+					break;
+				addr += mtd->eraseregions[i].erasesize;
+				len -= mtd->eraseregions[i].erasesize;
+			}
+		}
+		if (ret)
+			break;
+	}
+
+	/* Set erase status */
+	if (ret)
+		erase->state = MTD_ERASE_FAILED;
+	else
+		erase->state = MTD_ERASE_DONE;
+
+	/* Call erase callback */
+	if (erase->callback)
+		erase->callback(erase);
+
+	return ret;
+}
+
+static const char *probes[] = { "bcm47xx", NULL };
+
+static int bcm47xx_sflash_probe(struct platform_device *pdev)
+{
+	struct bcm47xx_sflash *sflash = dev_get_platdata(&pdev->dev);
+	struct mtd_info *mtd;
+	struct mtd_erase_region_info *regions;
+	int ret = 0;
+
+	mtd = kzalloc(sizeof(struct mtd_info), GFP_KERNEL);
+	if (!mtd)
+		return -ENOMEM;
+
+	regions = kzalloc(sizeof(struct mtd_erase_region_info), GFP_KERNEL);
+	if (!mtd)
+		return -ENOMEM;
+
+	pr_info("found serial flash: blocksize=%dKB, numblocks=%d, size=%dKB\n",
+		sflash->blocksize/1024, sflash->numblocks, sflash->size / 1024);
+
+	/* Setup region info */
+	regions->offset = 0;
+	regions->erasesize = sflash->blocksize;
+	regions->numblocks = sflash->numblocks;
+	if (regions->erasesize > mtd->erasesize)
+		mtd->erasesize = regions->erasesize;
+	mtd->size = sflash->size;
+	mtd->numeraseregions = 1;
+
+	/* Register with MTD */
+	mtd->name = "bcm47xx-sflash";
+	mtd->type = MTD_NORFLASH;
+	mtd->flags = MTD_CAP_NORFLASH;
+	mtd->eraseregions = regions;
+	mtd->erase = sflash_mtd_erase;
+	mtd->read = sflash_mtd_read;
+	mtd->write = sflash_mtd_write;
+	mtd->writesize = 1;
+	mtd->priv = sflash;
+	mtd->owner = THIS_MODULE;
+
+	ret = mtd_device_parse_register(mtd, probes, NULL, NULL, 0);
+
+	if (ret) {
+		pr_err("mtd_device_register failed\n");
+		return ret;
+	}
+	sflash->mtd = mtd;
+	return 0;
+}
+
+static int __devexit bcm47xx_sflash_remove(struct platform_device *pdev)
+{
+	struct bcm47xx_sflash *sflash = dev_get_platdata(&pdev->dev);
+
+	if (sflash) {
+		mtd_device_unregister(sflash->mtd);
+		map_destroy(sflash->mtd);
+		kfree(sflash->mtd->eraseregions);
+		kfree(sflash->mtd);
+	}
+	return 0;
+}
+
+static struct platform_driver bcm47xx_sflash_driver = {
+	.remove = __devexit_p(bcm47xx_sflash_remove),
+	.driver = {
+		.name = "bcm47xx_sflash",
+		.owner = THIS_MODULE,
+	},
+};
+
+static int __init init_bcm47xx_sflash(void)
+{
+	int ret = platform_driver_probe(&bcm47xx_sflash_driver, bcm47xx_sflash_probe);
+
+	if (ret)
+		pr_err("error registering platform driver: %i\n", ret);
+	return ret;
+}
+
+static void __exit exit_bcm47xx_sflash(void)
+{
+	platform_driver_unregister(&bcm47xx_sflash_driver);
+}
+
+module_init(init_bcm47xx_sflash);
+module_exit(exit_bcm47xx_sflash);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("BCM47XX parallel flash driver");