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From fb261916ee9cd9eede57f6255ffd39e4145da48e Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Sun, 17 Jul 2011 14:55:18 +0200
Subject: [PATCH 18/26] mtd: bcm47xx: add parallel flash driver
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
drivers/mtd/maps/Kconfig | 9 ++
drivers/mtd/maps/Makefile | 1 +
drivers/mtd/maps/bcm47xx-pflash.c | 198 +++++++++++++++++++++++++++++++++++++
3 files changed, 208 insertions(+), 0 deletions(-)
create mode 100644 drivers/mtd/maps/bcm47xx-pflash.c
--- a/drivers/mtd/maps/Kconfig
+++ b/drivers/mtd/maps/Kconfig
@@ -264,6 +264,15 @@ config MTD_LANTIQ
help
Support for NOR flash attached to the Lantiq SoC's External Bus Unit.
+config MTD_BCM47XX_PFLASH
+ tristate "bcm47xx parallel 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
@@ -60,3 +60,4 @@ obj-$(CONFIG_MTD_GPIO_ADDR) += gpio-addr
obj-$(CONFIG_MTD_BCM963XX) += bcm963xx-flash.o
obj-$(CONFIG_MTD_LATCH_ADDR) += latch-addr-flash.o
obj-$(CONFIG_MTD_LANTIQ) += lantiq-flash.o
+obj-$(CONFIG_MTD_BCM47XX_PFLASH)+= bcm47xx-pflash.o
--- /dev/null
+++ b/drivers/mtd/maps/bcm47xx-pflash.c
@@ -0,0 +1,198 @@
+/*
+ * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
+ * Copyright (C) 2005 Waldemar Brodkorb <wbx@openwrt.org>
+ * Copyright (C) 2004 Florian Schirmer (jolt@tuxbox.org)
+ *
+ * original functions for finding root filesystem from Mike Baker
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Copyright 2001-2003, 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.
+ *
+ * Flash mapping for BCM947XX boards
+ */
+
+#define pr_fmt(fmt) "bcm47xx_pflash: " fmt
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+#include <linux/io.h>
+#include <asm/mach-bcm47xx/bcm47xx.h>
+#include <linux/platform_device.h>
+
+#define WINDOW_ADDR 0x1fc00000
+#define WINDOW_SIZE 0x400000
+#define BUSWIDTH 2
+
+static struct mtd_info *bcm47xx_mtd;
+
+static void bcm47xx_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
+{
+ if (len == 1) {
+ memcpy_fromio(to, map->virt + from, len);
+ } else {
+ int i;
+ u16 *dest = (u16 *) to;
+ u16 *src = (u16 *) (map->virt + from);
+ for (i = 0; i < (len / 2); i++)
+ dest[i] = src[i];
+ if (len & 1)
+ *((u8 *)dest+len-1) = src[i] & 0xff;
+ }
+}
+
+static struct map_info bcm47xx_map = {
+ name: "Physically mapped flash",
+ size : WINDOW_SIZE,
+ bankwidth : BUSWIDTH,
+ phys : WINDOW_ADDR,
+};
+
+static const char *probes[] = { "bcm47xx", NULL };
+
+static int bcm47xx_mtd_probe(struct platform_device *pdev)
+{
+#ifdef CONFIG_BCM47XX_SSB
+ struct ssb_chipcommon *ssb_cc;
+#endif
+#ifdef CONFIG_BCM47XX_BCMA
+ struct bcma_drv_cc *bcma_cc;
+#endif
+ int ret = 0;
+ struct mtd_partition *partitions = NULL;
+ int num_partitions = 0;
+
+ switch (bcm47xx_bus_type) {
+#ifdef CONFIG_BCM47XX_SSB
+ case BCM47XX_BUS_TYPE_SSB:
+ ssb_cc = &bcm47xx_bus.ssb.chipco;
+ if (ssb_cc->flash_type != SSB_PFLASH)
+ return -ENODEV;
+
+ bcm47xx_map.phys = ssb_cc->pflash.window;
+ bcm47xx_map.size = ssb_cc->pflash.window_size;
+ bcm47xx_map.bankwidth = ssb_cc->pflash.buswidth;
+ break;
+#endif
+#ifdef CONFIG_BCM47XX_BCMA
+ case BCM47XX_BUS_TYPE_BCMA:
+ bcma_cc = &bcm47xx_bus.bcma.bus.drv_cc;
+ if (bcma_cc->flash_type != BCMA_PFLASH)
+ return -ENODEV;
+
+ bcm47xx_map.phys = bcma_cc->pflash.window;
+ bcm47xx_map.size = bcma_cc->pflash.window_size;
+ bcm47xx_map.bankwidth = bcma_cc->pflash.buswidth;
+ break;
+#endif
+ }
+
+ pr_notice("flash init: 0x%08x 0x%08lx\n", bcm47xx_map.phys, bcm47xx_map.size);
+ bcm47xx_map.virt = ioremap_nocache(bcm47xx_map.phys, bcm47xx_map.size);
+
+ if (!bcm47xx_map.virt) {
+ pr_err("Failed to ioremap\n");
+ return -EIO;
+ }
+
+ simple_map_init(&bcm47xx_map);
+ /* override copy_from routine */
+ bcm47xx_map.copy_from = bcm47xx_map_copy_from;
+
+ bcm47xx_mtd = do_map_probe("cfi_probe", &bcm47xx_map);
+ if (!bcm47xx_mtd) {
+ pr_err("Failed to do_map_probe\n");
+ ret = -ENXIO;
+ goto err_unmap;
+ }
+ bcm47xx_mtd->owner = THIS_MODULE;
+
+ pr_notice("Flash device: 0x%lx at 0x%x\n", bcm47xx_map.size, WINDOW_ADDR);
+
+ num_partitions = parse_mtd_partitions(bcm47xx_mtd, probes, &partitions, 0);
+ if (num_partitions < 0) {
+ ret = num_partitions;
+ goto err_unmap;
+ }
+
+ ret = mtd_device_register(bcm47xx_mtd, partitions, num_partitions);
+
+// ret = mtd_device_parse_register(bcm47xx_mtd, "bcm47xx", NULL, NULL, 0);
+
+ if (ret) {
+ pr_err("Flash: mtd_device_register failed\n");
+ goto err_destroy;
+ }
+ return 0;
+
+err_destroy:
+ map_destroy(bcm47xx_mtd);
+err_unmap:
+ iounmap(bcm47xx_map.virt);
+ return ret;
+}
+
+static int __devexit bcm47xx_mtd_remove(struct platform_device *pdev)
+{
+ mtd_device_unregister(bcm47xx_mtd);
+ map_destroy(bcm47xx_mtd);
+ iounmap(bcm47xx_map.virt);
+ return 0;
+}
+
+static struct platform_driver bcm47xx_mtd_driver = {
+ .remove = __devexit_p(bcm47xx_mtd_remove),
+ .driver = {
+ .name = "bcm47xx_pflash",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init init_bcm47xx_mtd(void)
+{
+ int ret = platform_driver_probe(&bcm47xx_mtd_driver, bcm47xx_mtd_probe);
+
+ if (ret)
+ pr_err("error registering platform driver: %i\n", ret);
+ return ret;
+}
+
+static void __exit exit_bcm47xx_mtd(void)
+{
+ platform_driver_unregister(&bcm47xx_mtd_driver);
+}
+
+module_init(init_bcm47xx_mtd);
+module_exit(exit_bcm47xx_mtd);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("BCM47XX parallel flash driver");
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