MIPS: Lantiq: Add NOR flash support (3c544739) · Commits · e / devices / android_kernel_teracube_2e

drivers/mtd/maps/Kconfig

+7 −0

Original line number	Diff line number	Diff line
		@@ -260,6 +260,13 @@ config MTD_BCM963XX
		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

drivers/mtd/maps/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -60,3 +60,4 @@ obj-$(CONFIG_MTD_VMU) += vmu-flash.o
		obj-$(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

drivers/mtd/maps/lantiq-flash.c

0 → 100644

+251 −0

Original line number	Diff line number	Diff line
		/*
		* 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");