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-rw-r--r--target/linux/lantiq/patches-2.6.39/0004-MIPS-Lantiq-Add-NOR-flash-support.patch301
1 files changed, 301 insertions, 0 deletions
diff --git a/target/linux/lantiq/patches-2.6.39/0004-MIPS-Lantiq-Add-NOR-flash-support.patch b/target/linux/lantiq/patches-2.6.39/0004-MIPS-Lantiq-Add-NOR-flash-support.patch
new file mode 100644
index 0000000..80efc1f
--- /dev/null
+++ b/target/linux/lantiq/patches-2.6.39/0004-MIPS-Lantiq-Add-NOR-flash-support.patch
@@ -0,0 +1,301 @@
+From cd0d53b24ca744295d2cdf69bb2b659571091b75 Mon Sep 17 00:00:00 2001
+From: John Crispin <blogic@openwrt.org>
+Date: Tue, 12 Apr 2011 18:10:01 +0200
+Subject: [PATCH 04/13] MIPS: Lantiq: Add NOR flash support
+
+This patch adds the driver/map for NOR devices attached to the SoC via the
+External Bus Unit (EBU).
+
+Signed-off-by: John Crispin <blogic@openwrt.org>
+Signed-off-by: Ralph Hempel <ralph.hempel@lantiq.com>
+Cc: David Woodhouse <dwmw2@infradead.org>
+Cc: Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>
+Cc: linux-mips@linux-mips.org
+Cc: linux-mtd@lists.infradead.org
+Acked-by: Artem Bityutskiy <dedekind1@gmail.com>
+Patchwork: https://patchwork.linux-mips.org/patch/2285/
+Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
+---
+ drivers/mtd/maps/Kconfig | 7 +
+ drivers/mtd/maps/Makefile | 1 +
+ drivers/mtd/maps/lantiq-flash.c | 251 +++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 259 insertions(+), 0 deletions(-)
+ create mode 100644 drivers/mtd/maps/lantiq-flash.c
+
+--- a/drivers/mtd/maps/Kconfig
++++ b/drivers/mtd/maps/Kconfig
+@@ -260,6 +260,13 @@
+ Support for parsing CFE image tag and creating MTD partitions on
+ Broadcom BCM63xx boards.
+
++config MTD_LANTIQ
++ tristate "Lantiq SoC NOR support"
++ depends on LANTIQ
++ select MTD_PARTITIONS
++ help
++ Support for NOR flash attached to the Lantiq SoC's External Bus Unit.
++
+ config MTD_DILNETPC
+ tristate "CFI Flash device mapped on DIL/Net PC"
+ depends on X86 && MTD_PARTITIONS && MTD_CFI_INTELEXT && BROKEN
+--- a/drivers/mtd/maps/Makefile
++++ b/drivers/mtd/maps/Makefile
+@@ -60,3 +60,4 @@
+ obj-$(CONFIG_MTD_GPIO_ADDR) += gpio-addr-flash.o
+ obj-$(CONFIG_MTD_BCM963XX) += bcm963xx-flash.o
+ obj-$(CONFIG_MTD_LATCH_ADDR) += latch-addr-flash.o
++obj-$(CONFIG_MTD_LANTIQ) += lantiq-flash.o
+--- /dev/null
++++ b/drivers/mtd/maps/lantiq-flash.c
+@@ -0,0 +1,251 @@
++/*
++ * This program is free software; you can redistribute it and/or modify it
++ * under the terms of the GNU General Public License version 2 as published
++ * by the Free Software Foundation.
++ *
++ * Copyright (C) 2004 Liu Peng Infineon IFAP DC COM CPE
++ * Copyright (C) 2010 John Crispin <blogic@openwrt.org>
++ */
++
++#include <linux/module.h>
++#include <linux/types.h>
++#include <linux/kernel.h>
++#include <linux/io.h>
++#include <linux/slab.h>
++#include <linux/init.h>
++#include <linux/mtd/mtd.h>
++#include <linux/mtd/map.h>
++#include <linux/mtd/partitions.h>
++#include <linux/mtd/cfi.h>
++#include <linux/platform_device.h>
++#include <linux/mtd/physmap.h>
++
++#include <lantiq_soc.h>
++#include <lantiq_platform.h>
++
++/*
++ * The NOR flash is connected to the same external bus unit (EBU) as PCI.
++ * To make PCI work we need to enable the endianness swapping for the address
++ * written to the EBU. This endianness swapping works for PCI correctly but
++ * fails for attached NOR devices. To workaround this we need to use a complex
++ * map. The workaround involves swapping all addresses whilst probing the chip.
++ * Once probing is complete we stop swapping the addresses but swizzle the
++ * unlock addresses to ensure that access to the NOR device works correctly.
++ */
++
++enum {
++ LTQ_NOR_PROBING,
++ LTQ_NOR_NORMAL
++};
++
++struct ltq_mtd {
++ struct resource *res;
++ struct mtd_info *mtd;
++ struct map_info *map;
++};
++
++static char ltq_map_name[] = "ltq_nor";
++
++static map_word
++ltq_read16(struct map_info *map, unsigned long adr)
++{
++ unsigned long flags;
++ map_word temp;
++
++ if (map->map_priv_1 == LTQ_NOR_PROBING)
++ adr ^= 2;
++ spin_lock_irqsave(&ebu_lock, flags);
++ temp.x[0] = *(u16 *)(map->virt + adr);
++ spin_unlock_irqrestore(&ebu_lock, flags);
++ return temp;
++}
++
++static void
++ltq_write16(struct map_info *map, map_word d, unsigned long adr)
++{
++ unsigned long flags;
++
++ if (map->map_priv_1 == LTQ_NOR_PROBING)
++ adr ^= 2;
++ spin_lock_irqsave(&ebu_lock, flags);
++ *(u16 *)(map->virt + adr) = d.x[0];
++ spin_unlock_irqrestore(&ebu_lock, flags);
++}
++
++/*
++ * The following 2 functions copy data between iomem and a cached memory
++ * section. As memcpy() makes use of pre-fetching we cannot use it here.
++ * The normal alternative of using memcpy_{to,from}io also makes use of
++ * memcpy() on MIPS so it is not applicable either. We are therefore stuck
++ * with having to use our own loop.
++ */
++static void
++ltq_copy_from(struct map_info *map, void *to,
++ unsigned long from, ssize_t len)
++{
++ unsigned char *f = (unsigned char *)map->virt + from;
++ unsigned char *t = (unsigned char *)to;
++ unsigned long flags;
++
++ spin_lock_irqsave(&ebu_lock, flags);
++ while (len--)
++ *t++ = *f++;
++ spin_unlock_irqrestore(&ebu_lock, flags);
++}
++
++static void
++ltq_copy_to(struct map_info *map, unsigned long to,
++ const void *from, ssize_t len)
++{
++ unsigned char *f = (unsigned char *)from;
++ unsigned char *t = (unsigned char *)map->virt + to;
++ unsigned long flags;
++
++ spin_lock_irqsave(&ebu_lock, flags);
++ while (len--)
++ *t++ = *f++;
++ spin_unlock_irqrestore(&ebu_lock, flags);
++}
++
++static const char const *part_probe_types[] = { "cmdlinepart", NULL };
++
++static int __init
++ltq_mtd_probe(struct platform_device *pdev)
++{
++ struct physmap_flash_data *ltq_mtd_data = dev_get_platdata(&pdev->dev);
++ struct ltq_mtd *ltq_mtd;
++ struct mtd_partition *parts;
++ struct resource *res;
++ int nr_parts = 0;
++ struct cfi_private *cfi;
++ int err;
++
++ ltq_mtd = kzalloc(sizeof(struct ltq_mtd), GFP_KERNEL);
++ platform_set_drvdata(pdev, ltq_mtd);
++
++ ltq_mtd->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++ if (!ltq_mtd->res) {
++ dev_err(&pdev->dev, "failed to get memory resource");
++ err = -ENOENT;
++ goto err_out;
++ }
++
++ res = devm_request_mem_region(&pdev->dev, ltq_mtd->res->start,
++ resource_size(ltq_mtd->res), dev_name(&pdev->dev));
++ if (!ltq_mtd->res) {
++ dev_err(&pdev->dev, "failed to request mem resource");
++ err = -EBUSY;
++ goto err_out;
++ }
++
++ ltq_mtd->map = kzalloc(sizeof(struct map_info), GFP_KERNEL);
++ ltq_mtd->map->phys = res->start;
++ ltq_mtd->map->size = resource_size(res);
++ ltq_mtd->map->virt = devm_ioremap_nocache(&pdev->dev,
++ ltq_mtd->map->phys, ltq_mtd->map->size);
++ if (!ltq_mtd->map->virt) {
++ dev_err(&pdev->dev, "failed to ioremap!\n");
++ err = -ENOMEM;
++ goto err_free;
++ }
++
++ ltq_mtd->map->name = ltq_map_name;
++ ltq_mtd->map->bankwidth = 2;
++ ltq_mtd->map->read = ltq_read16;
++ ltq_mtd->map->write = ltq_write16;
++ ltq_mtd->map->copy_from = ltq_copy_from;
++ ltq_mtd->map->copy_to = ltq_copy_to;
++
++ ltq_mtd->map->map_priv_1 = LTQ_NOR_PROBING;
++ ltq_mtd->mtd = do_map_probe("cfi_probe", ltq_mtd->map);
++ ltq_mtd->map->map_priv_1 = LTQ_NOR_NORMAL;
++
++ if (!ltq_mtd->mtd) {
++ dev_err(&pdev->dev, "probing failed\n");
++ err = -ENXIO;
++ goto err_unmap;
++ }
++
++ ltq_mtd->mtd->owner = THIS_MODULE;
++
++ cfi = ltq_mtd->map->fldrv_priv;
++ cfi->addr_unlock1 ^= 1;
++ cfi->addr_unlock2 ^= 1;
++
++ nr_parts = parse_mtd_partitions(ltq_mtd->mtd,
++ part_probe_types, &parts, 0);
++ if (nr_parts > 0) {
++ dev_info(&pdev->dev,
++ "using %d partitions from cmdline", nr_parts);
++ } else {
++ nr_parts = ltq_mtd_data->nr_parts;
++ parts = ltq_mtd_data->parts;
++ }
++
++ err = add_mtd_partitions(ltq_mtd->mtd, parts, nr_parts);
++ if (err) {
++ dev_err(&pdev->dev, "failed to add partitions\n");
++ goto err_destroy;
++ }
++
++ return 0;
++
++err_destroy:
++ map_destroy(ltq_mtd->mtd);
++err_unmap:
++ iounmap(ltq_mtd->map->virt);
++err_free:
++ kfree(ltq_mtd->map);
++err_out:
++ kfree(ltq_mtd);
++ return err;
++}
++
++static int __devexit
++ltq_mtd_remove(struct platform_device *pdev)
++{
++ struct ltq_mtd *ltq_mtd = platform_get_drvdata(pdev);
++
++ if (ltq_mtd) {
++ if (ltq_mtd->mtd) {
++ del_mtd_partitions(ltq_mtd->mtd);
++ map_destroy(ltq_mtd->mtd);
++ }
++ if (ltq_mtd->map->virt)
++ iounmap(ltq_mtd->map->virt);
++ kfree(ltq_mtd->map);
++ kfree(ltq_mtd);
++ }
++ return 0;
++}
++
++static struct platform_driver ltq_mtd_driver = {
++ .remove = __devexit_p(ltq_mtd_remove),
++ .driver = {
++ .name = "ltq_nor",
++ .owner = THIS_MODULE,
++ },
++};
++
++static int __init
++init_ltq_mtd(void)
++{
++ int ret = platform_driver_probe(&ltq_mtd_driver, ltq_mtd_probe);
++
++ if (ret)
++ pr_err("ltq_nor: error registering platform driver");
++ return ret;
++}
++
++static void __exit
++exit_ltq_mtd(void)
++{
++ platform_driver_unregister(&ltq_mtd_driver);
++}
++
++module_init(init_ltq_mtd);
++module_exit(exit_ltq_mtd);
++
++MODULE_LICENSE("GPL");
++MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
++MODULE_DESCRIPTION("Lantiq SoC NOR");
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