+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * drivers/mtd/maps/ixp4xx.c
- *
- * MTD Map file for IXP4XX based systems. Please do not make per-board
- * changes in here. If your board needs special setup, do it in your
- * platform level code in arch/arm/mach-ixp4xx/board-setup.c
- *
- * Original Author: Intel Corporation
- * Maintainer: Deepak Saxena <dsaxena@mvista.com>
- *
- * Copyright (C) 2002 Intel Corporation
- * Copyright (C) 2003-2004 MontaVista Software, Inc.
- *
- */
-
-#include <linux/err.h>
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-#include <linux/ioport.h>
-#include <linux/device.h>
-#include <linux/platform_device.h>
-
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/map.h>
-#include <linux/mtd/partitions.h>
-
-#include <asm/io.h>
-#include <asm/mach/flash.h>
-
-#include <linux/reboot.h>
-
-/*
- * Read/write a 16 bit word from flash address 'addr'.
- *
- * When the cpu is in little-endian mode it swizzles the address lines
- * ('address coherency') so we need to undo the swizzling to ensure commands
- * and the like end up on the correct flash address.
- *
- * To further complicate matters, due to the way the expansion bus controller
- * handles 32 bit reads, the byte stream ABCD is stored on the flash as:
- * D15 D0
- * +---+---+
- * | A | B | 0
- * +---+---+
- * | C | D | 2
- * +---+---+
- * This means that on LE systems each 16 bit word must be swapped. Note that
- * this requires CONFIG_MTD_CFI_BE_BYTE_SWAP to be enabled to 'unswap' the CFI
- * data and other flash commands which are always in D7-D0.
- */
-#ifndef __ARMEB__
-#ifndef CONFIG_MTD_CFI_BE_BYTE_SWAP
-# error CONFIG_MTD_CFI_BE_BYTE_SWAP required
-#endif
-
-static inline u16 flash_read16(void __iomem *addr)
-{
- return be16_to_cpu(__raw_readw((void __iomem *)((unsigned long)addr ^ 0x2)));
-}
-
-static inline void flash_write16(u16 d, void __iomem *addr)
-{
- __raw_writew(cpu_to_be16(d), (void __iomem *)((unsigned long)addr ^ 0x2));
-}
-
-#define BYTE0(h) ((h) & 0xFF)
-#define BYTE1(h) (((h) >> 8) & 0xFF)
-
-#else
-
-static inline u16 flash_read16(const void __iomem *addr)
-{
- return __raw_readw(addr);
-}
-
-static inline void flash_write16(u16 d, void __iomem *addr)
-{
- __raw_writew(d, addr);
-}
-
-#define BYTE0(h) (((h) >> 8) & 0xFF)
-#define BYTE1(h) ((h) & 0xFF)
-#endif
-
-static map_word ixp4xx_read16(struct map_info *map, unsigned long ofs)
-{
- map_word val;
- val.x[0] = flash_read16(map->virt + ofs);
- return val;
-}
-
-/*
- * The IXP4xx expansion bus only allows 16-bit wide acceses
- * when attached to a 16-bit wide device (such as the 28F128J3A),
- * so we can't just memcpy_fromio().
- */
-static void ixp4xx_copy_from(struct map_info *map, void *to,
- unsigned long from, ssize_t len)
-{
- u8 *dest = (u8 *) to;
- void __iomem *src = map->virt + from;
-
- if (len <= 0)
- return;
-
- if (from & 1) {
- *dest++ = BYTE1(flash_read16(src-1));
- src++;
- --len;
- }
-
- while (len >= 2) {
- u16 data = flash_read16(src);
- *dest++ = BYTE0(data);
- *dest++ = BYTE1(data);
- src += 2;
- len -= 2;
- }
-
- if (len > 0)
- *dest++ = BYTE0(flash_read16(src));
-}
-
-/*
- * Unaligned writes are ignored, causing the 8-bit
- * probe to fail and proceed to the 16-bit probe (which succeeds).
- */
-static void ixp4xx_probe_write16(struct map_info *map, map_word d, unsigned long adr)
-{
- if (!(adr & 1))
- flash_write16(d.x[0], map->virt + adr);
-}
-
-/*
- * Fast write16 function without the probing check above
- */
-static void ixp4xx_write16(struct map_info *map, map_word d, unsigned long adr)
-{
- flash_write16(d.x[0], map->virt + adr);
-}
-
-struct ixp4xx_flash_info {
- struct mtd_info *mtd;
- struct map_info map;
- struct resource *res;
-};
-
-static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL };
-
-static int ixp4xx_flash_remove(struct platform_device *dev)
-{
- struct flash_platform_data *plat = dev_get_platdata(&dev->dev);
- struct ixp4xx_flash_info *info = platform_get_drvdata(dev);
-
- if(!info)
- return 0;
-
- if (info->mtd) {
- mtd_device_unregister(info->mtd);
- map_destroy(info->mtd);
- }
-
- if (plat->exit)
- plat->exit();
-
- return 0;
-}
-
-static int ixp4xx_flash_probe(struct platform_device *dev)
-{
- struct flash_platform_data *plat = dev_get_platdata(&dev->dev);
- struct ixp4xx_flash_info *info;
- struct mtd_part_parser_data ppdata = {
- .origin = dev->resource->start,
- };
- int err = -1;
-
- if (!plat)
- return -ENODEV;
-
- if (plat->init) {
- err = plat->init();
- if (err)
- return err;
- }
-
- info = devm_kzalloc(&dev->dev, sizeof(struct ixp4xx_flash_info),
- GFP_KERNEL);
- if(!info) {
- err = -ENOMEM;
- goto Error;
- }
-
- platform_set_drvdata(dev, info);
-
- /*
- * Tell the MTD layer we're not 1:1 mapped so that it does
- * not attempt to do a direct access on us.
- */
- info->map.phys = NO_XIP;
- info->map.size = resource_size(dev->resource);
-
- /*
- * We only support 16-bit accesses for now. If and when
- * any board use 8-bit access, we'll fixup the driver to
- * handle that.
- */
- info->map.bankwidth = 2;
- info->map.name = dev_name(&dev->dev);
- info->map.read = ixp4xx_read16;
- info->map.write = ixp4xx_probe_write16;
- info->map.copy_from = ixp4xx_copy_from;
-
- info->map.virt = devm_ioremap_resource(&dev->dev, dev->resource);
- if (IS_ERR(info->map.virt)) {
- err = PTR_ERR(info->map.virt);
- goto Error;
- }
-
- info->mtd = do_map_probe(plat->map_name, &info->map);
- if (!info->mtd) {
- printk(KERN_ERR "IXP4XXFlash: map_probe failed\n");
- err = -ENXIO;
- goto Error;
- }
- info->mtd->dev.parent = &dev->dev;
-
- /* Use the fast version */
- info->map.write = ixp4xx_write16;
-
- err = mtd_device_parse_register(info->mtd, probes, &ppdata,
- plat->parts, plat->nr_parts);
- if (err) {
- printk(KERN_ERR "Could not parse partitions\n");
- goto Error;
- }
-
- return 0;
-
-Error:
- ixp4xx_flash_remove(dev);
- return err;
-}
-
-static struct platform_driver ixp4xx_flash_driver = {
- .probe = ixp4xx_flash_probe,
- .remove = ixp4xx_flash_remove,
- .driver = {
- .name = "IXP4XX-Flash",
- },
-};
-
-module_platform_driver(ixp4xx_flash_driver);
-
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("MTD map driver for Intel IXP4xx systems");
-MODULE_AUTHOR("Deepak Saxena");
-MODULE_ALIAS("platform:IXP4XX-Flash");
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