+++ /dev/null
-/*
- * Platform driver for NOR flash devices on ADM5120 based boards
- *
- * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
- *
- * This file was derived from: drivers/mtd/map/physmap.c
- * Copyright (C) 2003 MontaVista Software Inc.
- * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
- *
- * 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.
- *
- */
-
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/io.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/mach-adm5120/adm5120_defs.h>
-#include <asm/mach-adm5120/adm5120_switch.h>
-#include <asm/mach-adm5120/adm5120_mpmc.h>
-#include <asm/mach-adm5120/adm5120_platform.h>
-
-#define DRV_NAME "adm5120-flash"
-#define DRV_DESC "ADM5120 flash MAP driver"
-#define MAX_PARSED_PARTS 8
-
-#ifdef ADM5120_FLASH_DEBUG
-#define MAP_DBG(m, f, a...) printk(KERN_INFO "%s: " f, (m->name) , ## a)
-#else
-#define MAP_DBG(m, f, a...) do {} while (0)
-#endif
-#define MAP_ERR(m, f, a...) printk(KERN_ERR "%s: " f, (m->name) , ## a)
-#define MAP_INFO(m, f, a...) printk(KERN_INFO "%s: " f, (m->name) , ## a)
-
-struct adm5120_map_info {
- struct map_info map;
- void (*switch_bank)(unsigned);
- unsigned long window_size;
-};
-
-struct adm5120_flash_info {
- struct mtd_info *mtd;
- struct resource *res;
- struct platform_device *dev;
- struct adm5120_map_info amap;
-};
-
-struct flash_desc {
- u32 phys;
- u32 srs_shift;
-};
-
-/*
- * Globals
- */
-static DEFINE_SPINLOCK(adm5120_flash_spin);
-#define FLASH_LOCK() spin_lock(&adm5120_flash_spin)
-#define FLASH_UNLOCK() spin_unlock(&adm5120_flash_spin)
-
-static u32 flash_bankwidths[4] = { 1, 2, 4, 0 };
-
-static u32 flash_sizes[8] = {
- 0, 512*1024, 1024*1024, 2*1024*1024,
- 4*1024*1024, 0, 0, 0
-};
-
-static struct flash_desc flash_descs[2] = {
- {
- .phys = ADM5120_SRAM0_BASE,
- .srs_shift = MEMCTRL_SRS0_SHIFT,
- }, {
- .phys = ADM5120_SRAM1_BASE,
- .srs_shift = MEMCTRL_SRS1_SHIFT,
- }
-};
-
-static const char const *probe_types[] = {
- "cfi_probe",
- "jedec_probe",
- "map_rom",
- NULL
-};
-
-static const char const *parse_types[] = {
- "cmdlinepart",
-#ifdef CONFIG_MTD_REDBOOT_PARTS
- "RedBoot",
-#endif
-#ifdef CONFIG_MTD_MYLOADER_PARTS
- "MyLoader",
-#endif
- NULL,
-};
-
-#define BANK_SIZE (2<<20)
-#define BANK_SIZE_MAX (4<<20)
-#define BANK_OFFS_MASK (BANK_SIZE-1)
-#define BANK_START_MASK (~BANK_OFFS_MASK)
-
-static inline struct adm5120_map_info *map_to_amap(struct map_info *map)
-{
- return (struct adm5120_map_info *)map;
-}
-
-static void adm5120_flash_switchbank(struct map_info *map,
- unsigned long ofs)
-{
- struct adm5120_map_info *amap = map_to_amap(map);
- unsigned bank;
-
- if (amap->switch_bank == NULL)
- return;
-
- bank = (ofs & BANK_START_MASK) >> 21;
- if (bank > 1)
- BUG();
-
- MAP_DBG(map, "switching to bank %u, ofs=%lX\n", bank, ofs);
- amap->switch_bank(bank);
-}
-
-static map_word adm5120_flash_read(struct map_info *map, unsigned long ofs)
-{
- struct adm5120_map_info *amap = map_to_amap(map);
- map_word ret;
-
- MAP_DBG(map, "reading from ofs %lX\n", ofs);
-
- if (ofs >= amap->window_size)
- return map_word_ff(map);
-
- FLASH_LOCK();
- adm5120_flash_switchbank(map, ofs);
- ret = inline_map_read(map, (ofs & (amap->window_size-1)));
- FLASH_UNLOCK();
-
- return ret;
-}
-
-static void adm5120_flash_write(struct map_info *map, const map_word datum,
- unsigned long ofs)
-{
- struct adm5120_map_info *amap = map_to_amap(map);
-
- MAP_DBG(map, "writing to ofs %lX\n", ofs);
-
- if (ofs > amap->window_size)
- return;
-
- FLASH_LOCK();
- adm5120_flash_switchbank(map, ofs);
- inline_map_write(map, datum, (ofs & (amap->window_size-1)));
- FLASH_UNLOCK();
-}
-
-static void adm5120_flash_copy_from(struct map_info *map, void *to,
- unsigned long from, ssize_t len)
-{
- struct adm5120_map_info *amap = map_to_amap(map);
- char *p;
- ssize_t t;
-
- MAP_DBG(map, "copy_from, to=%lX, from=%lX, len=%lX\n",
- (unsigned long)to, from, (unsigned long)len);
-
- if (from > amap->window_size)
- return;
-
- p = (char *)to;
- while (len > 0) {
- t = len;
- if ((from < BANK_SIZE) && ((from+len) > BANK_SIZE))
- t = BANK_SIZE-from;
-
- FLASH_LOCK();
- MAP_DBG(map, "copying %lu byte(s) from %lX to %lX\n",
- (unsigned long)t, (from & (amap->window_size-1)),
- (unsigned long)p);
- adm5120_flash_switchbank(map, from);
- inline_map_copy_from(map, p, (from & (amap->window_size-1)), t);
- FLASH_UNLOCK();
- p += t;
- from += t;
- len -= t;
- }
-}
-
-static int adm5120_flash_initres(struct adm5120_flash_info *info)
-{
- struct map_info *map = &info->amap.map;
- int err = 0;
-
- info->res = request_mem_region(map->phys, info->amap.window_size,
- map->name);
- if (info->res == NULL) {
- MAP_ERR(map, "could not reserve memory region\n");
- err = -ENOMEM;
- goto out;
- }
-
- map->virt = ioremap_nocache(map->phys, info->amap.window_size);
- if (map->virt == NULL) {
- MAP_ERR(map, "failed to ioremap flash region\n");
- err = -ENOMEM;
- goto out;
- }
-
-out:
- return err;
-}
-
-static int adm5120_flash_initinfo(struct adm5120_flash_info *info,
- struct platform_device *dev)
-{
- struct map_info *map = &info->amap.map;
- struct adm5120_flash_platform_data *pdata = dev->dev.platform_data;
- struct flash_desc *fdesc;
- u32 t = 0;
-
- map->name = dev_name(&dev->dev);
-
- if (dev->id > 1) {
- MAP_ERR(map, "invalid flash id\n");
- goto err_out;
- }
-
- fdesc = &flash_descs[dev->id];
-
- if (pdata)
- info->amap.window_size = pdata->window_size;
-
- if (info->amap.window_size == 0) {
- /* get memory window size */
- t = SW_READ_REG(SWITCH_REG_MEMCTRL) >> fdesc->srs_shift;
- t &= MEMCTRL_SRS_MASK;
- info->amap.window_size = flash_sizes[t];
- }
-
- if (info->amap.window_size == 0) {
- MAP_ERR(map, "unable to determine window size\n");
- goto err_out;
- }
-
- /* get flash bus width */
- switch (dev->id) {
- case 0:
- t = MPMC_READ_REG(SC1) & SC_MW_MASK;
- break;
- case 1:
- t = MPMC_READ_REG(SC0) & SC_MW_MASK;
- break;
- }
- map->bankwidth = flash_bankwidths[t];
- if (map->bankwidth == 0) {
- MAP_ERR(map, "invalid bus width detected\n");
- goto err_out;
- }
-
- map->phys = fdesc->phys;
- map->size = BANK_SIZE_MAX;
-
- simple_map_init(map);
- map->read = adm5120_flash_read;
- map->write = adm5120_flash_write;
- map->copy_from = adm5120_flash_copy_from;
-
- if (pdata) {
- map->set_vpp = pdata->set_vpp;
- info->amap.switch_bank = pdata->switch_bank;
- }
-
- info->dev = dev;
-
- MAP_INFO(map, "probing at 0x%lX, size:%ldKiB, width:%d bits\n",
- (unsigned long)map->phys,
- (unsigned long)info->amap.window_size >> 10,
- map->bankwidth*8);
-
- return 0;
-
-err_out:
- return -ENODEV;
-}
-
-static void adm5120_flash_initbanks(struct adm5120_flash_info *info)
-{
- struct map_info *map = &info->amap.map;
-
- if (info->mtd->size <= BANK_SIZE)
- /* no bank switching needed */
- return;
-
- if (info->amap.switch_bank) {
- info->amap.window_size = info->mtd->size;
- return;
- }
-
- MAP_ERR(map, "reduce visibility from %ldKiB to %ldKiB\n",
- (unsigned long)map->size >> 10,
- (unsigned long)info->mtd->size >> 10);
-
- info->mtd->size = info->amap.window_size;
-}
-
-static int adm5120_flash_remove(struct platform_device *dev)
-{
- struct adm5120_flash_info *info;
-
- info = platform_get_drvdata(dev);
- if (info == NULL)
- return 0;
-
- platform_set_drvdata(dev, NULL);
-
- if (info->mtd != NULL) {
- mtd_device_unregister(info->mtd);
- map_destroy(info->mtd);
- }
-
- if (info->amap.map.virt != NULL)
- iounmap(info->amap.map.virt);
-
- if (info->res != NULL) {
- release_resource(info->res);
- kfree(info->res);
- }
-
- return 0;
-}
-
-static int adm5120_flash_probe(struct platform_device *dev)
-{
- struct adm5120_flash_platform_data *pdata;
- struct adm5120_flash_info *info;
- struct map_info *map;
- const char **probe_type;
- int err;
-
- pdata = dev->dev.platform_data;
- if (!pdata) {
- dev_err(&dev->dev, "no platform data\n");
- return -EINVAL;
- }
-
- info = kzalloc(sizeof(*info), GFP_KERNEL);
- if (info == NULL) {
- err = -ENOMEM;
- goto err_out;
- }
-
- platform_set_drvdata(dev, info);
-
- err = adm5120_flash_initinfo(info, dev);
- if (err)
- goto err_out;
-
- err = adm5120_flash_initres(info);
- if (err)
- goto err_out;
-
- map = &info->amap.map;
- for (probe_type = probe_types; info->mtd == NULL && *probe_type != NULL;
- probe_type++)
- info->mtd = do_map_probe(*probe_type, map);
-
- if (info->mtd == NULL) {
- MAP_ERR(map, "map_probe failed\n");
- err = -ENXIO;
- goto err_out;
- }
-
- adm5120_flash_initbanks(info);
-
- if (info->mtd->size < info->amap.window_size) {
- /* readjust resources */
- iounmap(map->virt);
- release_resource(info->res);
- kfree(info->res);
-
- info->amap.window_size = info->mtd->size;
- map->size = info->mtd->size;
- MAP_INFO(map, "reducing map size to %ldKiB\n",
- (unsigned long)map->size >> 10);
- err = adm5120_flash_initres(info);
- if (err)
- goto err_out;
- }
-
- MAP_INFO(map, "found at 0x%lX, size:%ldKiB, width:%d bits\n",
- (unsigned long)map->phys, (unsigned long)info->mtd->size >> 10,
- map->bankwidth*8);
-
- info->mtd->owner = THIS_MODULE;
-
- err = mtd_device_parse_register(info->mtd, parse_types, 0,
- pdata->parts, pdata->nr_parts);
- if (err)
- goto err_out;
-
- return 0;
-
-err_out:
- adm5120_flash_remove(dev);
- return err;
-}
-
-#ifdef CONFIG_PM
-static int adm5120_flash_suspend(struct platform_device *dev,
- pm_message_t state)
-{
- struct adm5120_flash_info *info = platform_get_drvdata(dev);
- int ret = 0;
-
- if (info)
- ret = info->mtd->suspend(info->mtd);
-
- return ret;
-}
-
-static int adm5120_flash_resume(struct platform_device *dev)
-{
- struct adm5120_flash_info *info = platform_get_drvdata(dev);
-
- if (info)
- info->mtd->resume(info->mtd);
-
- return 0;
-}
-
-static void adm5120_flash_shutdown(struct platform_device *dev)
-{
- struct adm5120_flash_info *info = platform_get_drvdata(dev);
-
- if (info && info->mtd->suspend(info->mtd) == 0)
- info->mtd->resume(info->mtd);
-}
-#endif
-
-static struct platform_driver adm5120_flash_driver = {
- .probe = adm5120_flash_probe,
- .remove = adm5120_flash_remove,
-#ifdef CONFIG_PM
- .suspend = adm5120_flash_suspend,
- .resume = adm5120_flash_resume,
- .shutdown = adm5120_flash_shutdown,
-#endif
- .driver = {
- .name = DRV_NAME,
- },
-};
-
-static int __init adm5120_flash_init(void)
-{
- int err;
-
- err = platform_driver_register(&adm5120_flash_driver);
-
- return err;
-}
-
-static void __exit adm5120_flash_exit(void)
-{
- platform_driver_unregister(&adm5120_flash_driver);
-}
-
-module_init(adm5120_flash_init);
-module_exit(adm5120_flash_exit);
-
-MODULE_LICENSE("GPL v2");
-MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
-MODULE_DESCRIPTION(DRV_DESC);
projects / 15.05 / openwrt.git / blobdiff