1
0
mirror of git://projects.qi-hardware.com/openwrt-xburst.git synced 2024-12-11 22:05:20 +02:00
openwrt-xburst/target/linux/brcm47xx/patches-3.3/027-mtd-bcm47xx-add-serial-flash-driver.patch
hauke b7397011b8 [brcm47xx] make brcm47xx build only with bcma or only with ssb support.
There are some ifdefs missing so when only ssb or only bcma was
selected in the kernel config it did not build.


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@33209 3c298f89-4303-0410-b956-a3cf2f4a3e73
2012-08-18 14:08:35 +00:00

292 lines
6.7 KiB
Diff

--- a/drivers/mtd/maps/Kconfig
+++ b/drivers/mtd/maps/Kconfig
@@ -257,6 +257,15 @@ 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
@@ -58,3 +58,4 @@ obj-$(CONFIG_MTD_GPIO_ADDR) += gpio-addr
obj-$(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 +1,263 @@
+/*
+ * 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) "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;
+
+ 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
+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)
+{
+ int bytes;
+ int ret;
+ 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) {
+ 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 *eraseregions;
+ int ret = 0;
+
+ mtd = kzalloc(sizeof(struct mtd_info), GFP_KERNEL);
+ if (!mtd){
+ ret = -ENOMEM;
+ goto err_out;
+ }
+
+ 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 = sflash_mtd_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_free_eraseregions:
+ kfree(eraseregions);
+err_free_mtd:
+ kfree(mtd);
+err_out:
+ return ret;
+}
+
+static int __devexit bcm47xx_sflash_remove(struct platform_device *pdev)
+{
+ 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 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");