diff options
Diffstat (limited to 'target/linux/lantiq/patches-2.6.39/0004-MIPS-Lantiq-Add-NOR-flash-support.patch')
-rw-r--r-- | target/linux/lantiq/patches-2.6.39/0004-MIPS-Lantiq-Add-NOR-flash-support.patch | 301 |
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 0000000000..80efc1f4cb --- /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(<q_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(<q_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"); |