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569 lines
12 KiB
C
569 lines
12 KiB
C
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/*
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* Platform driver for NOR flash devices on ADM5120 based boards
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*
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* Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
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*
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* This file was derived from: drivers/mtd/map/physmap.c
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* Copyright (C) 2003 MontaVista Software Inc.
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* Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/partitions.h>
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#include <asm/mach-adm5120/adm5120_defs.h>
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#include <asm/mach-adm5120/adm5120_switch.h>
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#include <asm/mach-adm5120/adm5120_mpmc.h>
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#include <asm/mach-adm5120/adm5120_platform.h>
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#define DRV_NAME "adm5120-flash"
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#define DRV_DESC "ADM5120 flash MAP driver"
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#define MAX_PARSED_PARTS 8
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#ifdef ADM5120_FLASH_DEBUG
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#define MAP_DBG(m, f, a...) printk(KERN_INFO "%s: " f, (m->name) , ## a)
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#else
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#define MAP_DBG(m, f, a...) do {} while (0)
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#endif
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#define MAP_ERR(m, f, a...) printk(KERN_ERR "%s: " f, (m->name) , ## a)
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#define MAP_INFO(m, f, a...) printk(KERN_INFO "%s: " f, (m->name) , ## a)
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struct adm5120_map_info {
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struct map_info map;
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void (*switch_bank)(unsigned);
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unsigned long window_size;
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};
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struct adm5120_flash_info {
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struct mtd_info *mtd;
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struct resource *res;
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struct platform_device *dev;
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struct adm5120_map_info amap;
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#ifdef CONFIG_MTD_PARTITIONS
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int nr_parts;
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struct mtd_partition *parts[MAX_PARSED_PARTS];
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#endif
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};
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struct flash_desc {
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u32 phys;
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u32 srs_shift;
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};
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/*
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* Globals
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*/
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static DEFINE_SPINLOCK(adm5120_flash_spin);
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#define FLASH_LOCK() spin_lock(&adm5120_flash_spin)
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#define FLASH_UNLOCK() spin_unlock(&adm5120_flash_spin)
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static u32 flash_bankwidths[4] = { 1, 2, 4, 0 };
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static u32 flash_sizes[8] = {
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0, 512*1024, 1024*1024, 2*1024*1024,
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4*1024*1024, 0, 0, 0
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};
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static struct flash_desc flash_descs[2] = {
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{
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.phys = ADM5120_SRAM0_BASE,
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.srs_shift = MEMCTRL_SRS0_SHIFT,
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}, {
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.phys = ADM5120_SRAM1_BASE,
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.srs_shift = MEMCTRL_SRS1_SHIFT,
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}
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};
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static const char *probe_types[] = {
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"cfi_probe",
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"jedec_probe",
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"map_rom",
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NULL
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};
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#ifdef CONFIG_MTD_PARTITIONS
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static const char *parse_types[] = {
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"cmdlinepart",
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#ifdef CONFIG_MTD_REDBOOT_PARTS
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"RedBoot",
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#endif
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#ifdef CONFIG_MTD_MYLOADER_PARTS
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"MyLoader",
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#endif
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};
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#endif
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#define BANK_SIZE (2<<20)
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#define BANK_SIZE_MAX (4<<20)
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#define BANK_OFFS_MASK (BANK_SIZE-1)
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#define BANK_START_MASK (~BANK_OFFS_MASK)
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static inline struct adm5120_map_info *map_to_amap(struct map_info *map)
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{
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return (struct adm5120_map_info *)map;
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}
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static void adm5120_flash_switchbank(struct map_info *map,
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unsigned long ofs)
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{
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struct adm5120_map_info *amap = map_to_amap(map);
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unsigned bank;
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if (amap->switch_bank == NULL)
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return;
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bank = (ofs & BANK_START_MASK) >> 21;
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if (bank > 1)
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BUG();
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MAP_DBG(map, "switching to bank %u, ofs=%lX\n", bank, ofs);
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amap->switch_bank(bank);
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}
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static map_word adm5120_flash_read(struct map_info *map, unsigned long ofs)
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{
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struct adm5120_map_info *amap = map_to_amap(map);
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map_word ret;
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MAP_DBG(map, "reading from ofs %lX\n", ofs);
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if (ofs >= amap->window_size)
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return map_word_ff(map);
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FLASH_LOCK();
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adm5120_flash_switchbank(map, ofs);
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ret = inline_map_read(map, (ofs & (amap->window_size-1)));
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FLASH_UNLOCK();
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return ret;
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}
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static void adm5120_flash_write(struct map_info *map, const map_word datum,
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unsigned long ofs)
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{
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struct adm5120_map_info *amap = map_to_amap(map);
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MAP_DBG(map, "writing to ofs %lX\n", ofs);
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if (ofs > amap->window_size)
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return;
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FLASH_LOCK();
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adm5120_flash_switchbank(map, ofs);
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inline_map_write(map, datum, (ofs & (amap->window_size-1)));
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FLASH_UNLOCK();
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}
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static void adm5120_flash_copy_from(struct map_info *map, void *to,
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unsigned long from, ssize_t len)
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{
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struct adm5120_map_info *amap = map_to_amap(map);
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char *p;
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ssize_t t;
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MAP_DBG(map, "copy_from, to=%lX, from=%lX, len=%lX\n",
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(unsigned long)to, from, (unsigned long)len);
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if (from > amap->window_size)
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return;
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p = (char *)to;
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while (len > 0) {
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t = len;
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if ((from < BANK_SIZE) && ((from+len) > BANK_SIZE))
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t = BANK_SIZE-from;
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FLASH_LOCK();
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MAP_DBG(map, "copying %lu byte(s) from %lX to %lX\n",
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(unsigned long)t, (from & (amap->window_size-1)),
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(unsigned long)p);
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adm5120_flash_switchbank(map, from);
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inline_map_copy_from(map, p, (from & (amap->window_size-1)), t);
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FLASH_UNLOCK();
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p += t;
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from += t;
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len -= t;
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}
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}
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static int adm5120_flash_initres(struct adm5120_flash_info *info)
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{
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struct map_info *map = &info->amap.map;
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int err = 0;
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info->res = request_mem_region(map->phys, info->amap.window_size,
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map->name);
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if (info->res == NULL) {
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MAP_ERR(map, "could not reserve memory region\n");
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err = -ENOMEM;
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goto out;
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}
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map->virt = ioremap_nocache(map->phys, info->amap.window_size);
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if (map->virt == NULL) {
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MAP_ERR(map, "failed to ioremap flash region\n");
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err = -ENOMEM;
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goto out;
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}
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out:
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return err;
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}
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static int adm5120_flash_initinfo(struct adm5120_flash_info *info,
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struct platform_device *dev)
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{
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struct map_info *map = &info->amap.map;
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struct adm5120_flash_platform_data *pdata = dev->dev.platform_data;
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struct flash_desc *fdesc;
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u32 t = 0;
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map->name = dev->dev.bus_id;
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if (dev->id > 1) {
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MAP_ERR(map, "invalid flash id\n");
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goto err_out;
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}
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fdesc = &flash_descs[dev->id];
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if (pdata)
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info->amap.window_size = pdata->window_size;
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if (info->amap.window_size == 0) {
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/* get memory window size */
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t = SW_READ_REG(SWITCH_REG_MEMCTRL) >> fdesc->srs_shift;
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t &= MEMCTRL_SRS_MASK;
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info->amap.window_size = flash_sizes[t];
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}
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if (info->amap.window_size == 0) {
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MAP_ERR(map, "unable to determine window size\n");
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goto err_out;
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}
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/* get flash bus width */
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switch (dev->id) {
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case 0:
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t = MPMC_READ_REG(SC1) & SC_MW_MASK;
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break;
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case 1:
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t = MPMC_READ_REG(SC0) & SC_MW_MASK;
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break;
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}
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map->bankwidth = flash_bankwidths[t];
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if (map->bankwidth == 0) {
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MAP_ERR(map, "invalid bus width detected\n");
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goto err_out;
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}
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map->phys = fdesc->phys;
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map->size = BANK_SIZE_MAX;
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simple_map_init(map);
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map->read = adm5120_flash_read;
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map->write = adm5120_flash_write;
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map->copy_from = adm5120_flash_copy_from;
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if (pdata) {
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map->set_vpp = pdata->set_vpp;
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info->amap.switch_bank = pdata->switch_bank;
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}
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info->dev = dev;
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|
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MAP_INFO(map, "probing at 0x%lX, size:%ldKiB, width:%d bits\n",
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(unsigned long)map->phys,
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(unsigned long)info->amap.window_size >> 10,
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map->bankwidth*8);
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|
|
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return 0;
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|
|
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err_out:
|
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return -ENODEV;
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}
|
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|
|
||
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static void adm5120_flash_initbanks(struct adm5120_flash_info *info)
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{
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struct map_info *map = &info->amap.map;
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|
|
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if (info->mtd->size <= BANK_SIZE)
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/* no bank switching needed */
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return;
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|
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if (info->amap.switch_bank) {
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info->amap.window_size = info->mtd->size;
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return;
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}
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|
|
||
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MAP_ERR(map, "reduce visibility from %ldKiB to %ldKiB\n",
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|
(unsigned long)map->size >> 10,
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|
(unsigned long)info->mtd->size >> 10);
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|
|
||
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info->mtd->size = info->amap.window_size;
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}
|
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|
|
||
|
#ifdef CONFIG_MTD_PARTITIONS
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static int adm5120_flash_initparts(struct adm5120_flash_info *info)
|
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|
{
|
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|
struct adm5120_flash_platform_data *pdata;
|
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|
struct map_info *map = &info->amap.map;
|
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|
int num_parsers;
|
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|
const char *parser[2];
|
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|
int err = 0;
|
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|
int nr_parts;
|
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|
int i;
|
||
|
|
||
|
info->nr_parts = 0;
|
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|
|
||
|
pdata = info->dev->dev.platform_data;
|
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|
if (pdata == NULL)
|
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|
goto out;
|
||
|
|
||
|
if (pdata->nr_parts) {
|
||
|
MAP_INFO(map, "adding static partitions\n");
|
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|
err = add_mtd_partitions(info->mtd, pdata->parts,
|
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|
pdata->nr_parts);
|
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|
if (err == 0) {
|
||
|
info->nr_parts += pdata->nr_parts;
|
||
|
goto out;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
num_parsers = ARRAY_SIZE(parse_types);
|
||
|
if (num_parsers > MAX_PARSED_PARTS)
|
||
|
num_parsers = MAX_PARSED_PARTS;
|
||
|
|
||
|
parser[1] = NULL;
|
||
|
for (i = 0; i < num_parsers; i++) {
|
||
|
parser[0] = parse_types[i];
|
||
|
|
||
|
MAP_INFO(map, "parsing \"%s\" partitions\n",
|
||
|
parser[0]);
|
||
|
nr_parts = parse_mtd_partitions(info->mtd, parser,
|
||
|
&info->parts[i], 0);
|
||
|
|
||
|
if (nr_parts <= 0)
|
||
|
continue;
|
||
|
|
||
|
MAP_INFO(map, "adding \"%s\" partitions\n",
|
||
|
parser[0]);
|
||
|
|
||
|
err = add_mtd_partitions(info->mtd, info->parts[i], nr_parts);
|
||
|
if (err)
|
||
|
break;
|
||
|
|
||
|
info->nr_parts += nr_parts;
|
||
|
}
|
||
|
out:
|
||
|
return err;
|
||
|
}
|
||
|
#else
|
||
|
static int adm5120_flash_initparts(struct adm5120_flash_info *info)
|
||
|
{
|
||
|
return 0;
|
||
|
}
|
||
|
#endif /* CONFIG_MTD_PARTITIONS */
|
||
|
|
||
|
#ifdef CONFIG_MTD_PARTITIONS
|
||
|
static void adm5120_flash_remove_mtd(struct adm5120_flash_info *info)
|
||
|
{
|
||
|
int i;
|
||
|
|
||
|
if (info->nr_parts) {
|
||
|
del_mtd_partitions(info->mtd);
|
||
|
for (i = 0; i < MAX_PARSED_PARTS; i++)
|
||
|
if (info->parts[i] != NULL)
|
||
|
kfree(info->parts[i]);
|
||
|
} else {
|
||
|
del_mtd_device(info->mtd);
|
||
|
}
|
||
|
}
|
||
|
#else
|
||
|
static void adm5120_flash_remove_mtd(struct adm5120_flash_info *info)
|
||
|
{
|
||
|
del_mtd_device(info->mtd);
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
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) {
|
||
|
adm5120_flash_remove_mtd(info);
|
||
|
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_info *info;
|
||
|
struct map_info *map;
|
||
|
const char **probe_type;
|
||
|
int err;
|
||
|
|
||
|
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 = adm5120_flash_initparts(info);
|
||
|
if (err)
|
||
|
goto err_out;
|
||
|
|
||
|
if (info->nr_parts == 0) {
|
||
|
MAP_INFO(map, "no partitions available, registering "
|
||
|
"whole flash\n");
|
||
|
add_mtd_device(info->mtd);
|
||
|
}
|
||
|
|
||
|
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);
|