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wifipineapple-openwrt/target/linux/brcm47xx/patches-3.8/052-mtd-add-serial-flash-dr...

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--- a/drivers/mtd/devices/bcm47xxsflash.c
+++ b/drivers/mtd/devices/bcm47xxsflash.c
@@ -1,47 +1,153 @@
-#include <linux/kernel.h>
+/*
+ * Broadcom SiliconBackplane chipcommon serial flash interface
+ *
+ * Copyright 2011, 2012, Hauke Mehrtens <hauke@hauke-m.de>
+ * Copyright 2006, Broadcom Corporation
+ * All Rights Reserved.
+ *
+ * Licensed under the GNU/GPL. See COPYING for details.
+ */
+
+#define pr_fmt(fmt) "bcm47xxsflash: " 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 <linux/bcma/bcma.h>
-
-#include "bcm47xxsflash.h"
+#include <linux/mtd/bcm47xxsflash.h>
MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("Serial flash driver for BCMA bus");
+MODULE_DESCRIPTION("BCM47XX serial flash driver");
static const char *probes[] = { "bcm47xxpart", NULL };
+static int
+sflash_mtd_poll(struct bcm47xxsflash *sflash, unsigned int offset, int timeout)
+{
+ unsigned long now = jiffies;
+
+ for (;;) {
+ if (!sflash->poll(sflash, offset)) {
+ break;
+ }
+ if (time_after(jiffies, now + timeout)) {
+ pr_err("timeout while polling\n");
+ return -ETIMEDOUT;
+
+ }
+ cpu_relax();
+ udelay(1);
+ }
+
+ return 0;
+}
+
static int bcm47xxsflash_read(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
- struct bcm47xxsflash *b47s = mtd->priv;
+ struct bcm47xxsflash *sflash = (struct bcm47xxsflash *)mtd->priv;
/* Check address range */
+ if (!len)
+ return 0;
+
if ((from + len) > mtd->size)
return -EINVAL;
- memcpy_fromio(buf, (void __iomem *)KSEG0ADDR(b47s->window + from),
+ memcpy_fromio(buf, (void __iomem *)KSEG0ADDR(sflash->window + from),
len);
*retlen = len;
return len;
}
-static void bcm47xxsflash_fill_mtd(struct bcm47xxsflash *b47s)
+static int
+sflash_mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf)
{
- struct mtd_info *mtd = &b47s->mtd;
+ int bytes;
+ int ret;
+ struct bcm47xxsflash *sflash = (struct bcm47xxsflash *)mtd->priv;
- mtd->priv = b47s;
- mtd->name = "bcm47xxsflash";
- mtd->owner = THIS_MODULE;
- mtd->type = MTD_ROM;
- mtd->size = b47s->size;
- mtd->_read = bcm47xxsflash_read;
+ /* Check address range */
+ if (!len)
+ return 0;
+
+ if ((to + len) > mtd->size)
+ return -EINVAL;
+
+ *retlen = 0;
+ while (len) {
+ 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;
+ }
- /* TODO: implement writing support and verify/change following code */
- mtd->flags = MTD_CAP_ROM;
- mtd->writebufsize = mtd->writesize = 1;
+ return 0;
+}
+
+static int
+sflash_mtd_erase(struct mtd_info *mtd, struct erase_info *erase)
+{
+ struct bcm47xxsflash *sflash = (struct bcm47xxsflash *) 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;
}
/**************************************************
@@ -50,53 +156,94 @@ static void bcm47xxsflash_fill_mtd(struc
static int bcm47xxsflash_bcma_probe(struct platform_device *pdev)
{
- struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev);
- struct bcm47xxsflash *b47s;
- int err;
+ struct bcm47xxsflash *sflash = dev_get_platdata(&pdev->dev);
+ struct mtd_info *mtd;
+ struct mtd_erase_region_info *eraseregions;
+ int ret = 0;
+
+ mtd = kzalloc(sizeof(struct mtd_info), GFP_KERNEL);
+ if (!mtd){
+ ret = -ENOMEM;
+ goto err_out;
+ }
- b47s = kzalloc(sizeof(*b47s), GFP_KERNEL);
- if (!b47s) {
- err = -ENOMEM;
- goto out;
- }
- sflash->priv = b47s;
-
- b47s->window = sflash->window;
- b47s->blocksize = sflash->blocksize;
- b47s->numblocks = sflash->numblocks;
- b47s->size = sflash->size;
- bcm47xxsflash_fill_mtd(b47s);
-
- err = mtd_device_parse_register(&b47s->mtd, probes, NULL, NULL, 0);
- if (err) {
- pr_err("Failed to register MTD device: %d\n", err);
- goto err_dev_reg;
+ eraseregions = kzalloc(sizeof(struct mtd_erase_region_info), GFP_KERNEL);
+ if (!eraseregions) {
+ ret = -ENOMEM;
+ goto err_free_mtd;
}
+ pr_info("found serial flash: blocksize=%dKB, numblocks=%d, size=%dKB\n",
+ sflash->blocksize / 1024, sflash->numblocks, sflash->size / 1024);
+
+ /* Setup region info */
+ eraseregions->offset = 0;
+ eraseregions->erasesize = sflash->blocksize;
+ eraseregions->numblocks = sflash->numblocks;
+ if (eraseregions->erasesize > mtd->erasesize)
+ mtd->erasesize = eraseregions->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 = eraseregions;
+ mtd->_erase = sflash_mtd_erase;
+ mtd->_read = bcm47xxsflash_read;
+ mtd->_write = sflash_mtd_write;
+ mtd->writesize = 1;
+ mtd->priv = sflash;
+ ret = dev_set_drvdata(&pdev->dev, mtd);
+ mtd->owner = THIS_MODULE;
+ if (ret) {
+ pr_err("adding private data failed\n");
+ goto err_free_eraseregions;
+ }
+
+ ret = mtd_device_parse_register(mtd, probes, NULL, NULL, 0);
+
+ if (ret) {
+ pr_err("mtd_device_register failed\n");
+ goto err_free_eraseregions;
+ }
return 0;
-err_dev_reg:
- kfree(&b47s->mtd);
-out:
- return err;
+err_free_eraseregions:
+ kfree(eraseregions);
+err_free_mtd:
+ kfree(mtd);
+err_out:
+ return ret;
}
static int bcm47xxsflash_bcma_remove(struct platform_device *pdev)
{
- struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev);
- struct bcm47xxsflash *b47s = sflash->priv;
-
- mtd_device_unregister(&b47s->mtd);
- kfree(b47s);
+ struct mtd_info *mtd = dev_get_drvdata(&pdev->dev);
+ if (mtd) {
+ mtd_device_unregister(mtd);
+ map_destroy(mtd);
+ kfree(mtd->eraseregions);
+ kfree(mtd);
+ dev_set_drvdata(&pdev->dev, NULL);
+ }
return 0;
}
+static const struct platform_device_id bcm47xxsflash_table[] = {
+ { "bcm47xx-sflash", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(platform, bcm47xxsflash_table);
+
static struct platform_driver bcma_sflash_driver = {
+ .id_table = bcm47xxsflash_table,
.probe = bcm47xxsflash_bcma_probe,
.remove = bcm47xxsflash_bcma_remove,
.driver = {
- .name = "bcma_sflash",
+ .name = "bcm47xx-sflash",
.owner = THIS_MODULE,
},
};
@@ -111,8 +258,7 @@ static int __init bcm47xxsflash_init(voi
err = platform_driver_register(&bcma_sflash_driver);
if (err)
- pr_err("Failed to register BCMA serial flash driver: %d\n",
- err);
+ pr_err("error registering platform driver: %i\n", err);
return err;
}
--- /dev/null
+++ b/include/linux/mtd/bcm47xxsflash.h
@@ -0,0 +1,33 @@
+#ifndef LINUX_MTD_BCM47XX_SFLASH_H_
+#define LINUX_MTD_BCM47XX_SFLASH_H_
+
+#include <linux/mtd/mtd.h>
+
+enum bcm47xxsflash_type {
+ BCM47XX_SFLASH_SSB,
+ BCM47XX_SFLASH_BCMA,
+};
+
+struct ssb_chipcommon;
+struct bcma_drv_cc;
+
+struct bcm47xxsflash {
+ enum bcm47xxsflash_type type;
+ union {
+ struct ssb_chipcommon *scc;
+ struct bcma_drv_cc *bcc;
+ };
+
+ bool present;
+ u16 numblocks;
+ u32 window;
+ u32 blocksize;
+ u32 size;
+
+ int (*poll)(struct bcm47xxsflash *dev, u32 offset);
+ int (*write)(struct bcm47xxsflash *dev, u32 offset, u32 len, const u8 *buf);
+ int (*erase)(struct bcm47xxsflash *dev, u32 offset);
+
+ struct mtd_info *mtd;
+};
+#endif /* LINUX_MTD_BCM47XX_SFLASH_H_ */
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