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wifipineapple-openwrt/target/linux/brcm47xx/patches-3.2/0019-mtd-bcm47xx-add-serial...

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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");
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