path: root/target/linux/brcm47xx/patches-3.9/052-mtd-add-serial-flash-driver.patch

--- 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_ */