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pci.c 9.13 KiB
/*
* linux/drivers/mtd/maps/pci.c
*
* Copyright (C) 2001 Russell King, All rights reserved.
*
* 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.
*
* $Id: pci.c,v 1.14 2005/11/17 08:20:27 dwmw2 Exp $
*
* Generic PCI memory map driver. We support the following boards:
* - Intel IQ80310 ATU.
* - Intel EBSA285 (blank rom programming mode). Tested working 27/09/2001
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
struct map_pci_info;
struct mtd_pci_info {
int (*init)(struct pci_dev *dev, struct map_pci_info *map);
void (*exit)(struct pci_dev *dev, struct map_pci_info *map);
unsigned long (*translate)(struct map_pci_info *map, unsigned long ofs);
const char *map_name;
};
struct map_pci_info {
struct map_info map;
void __iomem *base;
void (*exit)(struct pci_dev *dev, struct map_pci_info *map);
unsigned long (*translate)(struct map_pci_info *map, unsigned long ofs);
struct pci_dev *dev;
};
static map_word mtd_pci_read8(struct map_info *_map, unsigned long ofs)
{
struct map_pci_info *map = (struct map_pci_info *)_map;
map_word val;
val.x[0]= readb(map->base + map->translate(map, ofs));
// printk("read8 : %08lx => %02x\n", ofs, val.x[0]);
return val;
}
#if 0
static map_word mtd_pci_read16(struct map_info *_map, unsigned long ofs)
{
struct map_pci_info *map = (struct map_pci_info *)_map;
map_word val;
val.x[0] = readw(map->base + map->translate(map, ofs));
// printk("read16: %08lx => %04x\n", ofs, val.x[0]);
return val;
}
#endif
static map_word mtd_pci_read32(struct map_info *_map, unsigned long ofs)
{
struct map_pci_info *map = (struct map_pci_info *)_map;
map_word val;
val.x[0] = readl(map->base + map->translate(map, ofs));
// printk("read32: %08lx => %08x\n", ofs, val.x[0]);
return val;
}
static void mtd_pci_copyfrom(struct map_info *_map, void *to, unsigned long from, ssize_t len)
{
struct map_pci_info *map = (struct map_pci_info *)_map;
memcpy_fromio(to, map->base + map->translate(map, from), len);
}
static void mtd_pci_write8(struct map_info *_map, map_word val, unsigned long ofs)
{
struct map_pci_info *map = (struct map_pci_info *)_map;
// printk("write8 : %08lx <= %02x\n", ofs, val.x[0]);
writeb(val.x[0], map->base + map->translate(map, ofs));
}
#if 0
static void mtd_pci_write16(struct map_info *_map, map_word val, unsigned long ofs)
{
struct map_pci_info *map = (struct map_pci_info *)_map;
// printk("write16: %08lx <= %04x\n", ofs, val.x[0]);
writew(val.x[0], map->base + map->translate(map, ofs));
}
#endif
static void mtd_pci_write32(struct map_info *_map, map_word val, unsigned long ofs)
{
struct map_pci_info *map = (struct map_pci_info *)_map;
// printk("write32: %08lx <= %08x\n", ofs, val.x[0]);
writel(val.x[0], map->base + map->translate(map, ofs));
}
static void mtd_pci_copyto(struct map_info *_map, unsigned long to, const void *from, ssize_t len)
{
struct map_pci_info *map = (struct map_pci_info *)_map;
memcpy_toio(map->base + map->translate(map, to), from, len);
}
static const struct map_info mtd_pci_map = {
.phys = NO_XIP,
.copy_from = mtd_pci_copyfrom,
.copy_to = mtd_pci_copyto,
};
/*
* Intel IOP80310 Flash driver
*/
static int
intel_iq80310_init(struct pci_dev *dev, struct map_pci_info *map)
{
u32 win_base;
map->map.bankwidth = 1;
map->map.read = mtd_pci_read8,
map->map.write = mtd_pci_write8,
map->map.size = 0x00800000;
map->base = ioremap_nocache(pci_resource_start(dev, 0),
pci_resource_len(dev, 0));
if (!map->base)
return -ENOMEM;
/*
* We want to base the memory window at Xscale
* bus address 0, not 0x1000.
*/
pci_read_config_dword(dev, 0x44, &win_base);
pci_write_config_dword(dev, 0x44, 0);
map->map.map_priv_2 = win_base;
return 0;}
static void
intel_iq80310_exit(struct pci_dev *dev, struct map_pci_info *map)
{
if (map->base)
iounmap(map->base);
pci_write_config_dword(dev, 0x44, map->map.map_priv_2);
}
static unsigned long
intel_iq80310_translate(struct map_pci_info *map, unsigned long ofs)
{
unsigned long page_addr = ofs & 0x00400000;
/*
* This mundges the flash location so we avoid
* the first 80 bytes (they appear to read nonsense).
*/
if (page_addr) {
writel(0x00000008, map->base + 0x1558);
writel(0x00000000, map->base + 0x1550);
} else {
writel(0x00000007, map->base + 0x1558);
writel(0x00800000, map->base + 0x1550);
ofs += 0x00800000;
}
return ofs;
}
static struct mtd_pci_info intel_iq80310_info = {
.init = intel_iq80310_init,
.exit = intel_iq80310_exit,
.translate = intel_iq80310_translate,
.map_name = "cfi_probe",
};
/*
* Intel DC21285 driver
*/
static int
intel_dc21285_init(struct pci_dev *dev, struct map_pci_info *map)
{
unsigned long base, len;
base = pci_resource_start(dev, PCI_ROM_RESOURCE);
len = pci_resource_len(dev, PCI_ROM_RESOURCE);
if (!len || !base) {
/*
* No ROM resource
*/
base = pci_resource_start(dev, 2);
len = pci_resource_len(dev, 2);
/*
* We need to re-allocate PCI BAR2 address range to the
* PCI ROM BAR, and disable PCI BAR2.
*/
} else {
/*
* Hmm, if an address was allocated to the ROM resource, but
* not enabled, should we be allocating a new resource for it
* or simply enabling it?
*/
if (!(pci_resource_flags(dev, PCI_ROM_RESOURCE) &
IORESOURCE_ROM_ENABLE)) {
u32 val; pci_resource_flags(dev, PCI_ROM_RESOURCE) |= IORESOURCE_ROM_ENABLE;
pci_read_config_dword(dev, PCI_ROM_ADDRESS, &val);
val |= PCI_ROM_ADDRESS_ENABLE;
pci_write_config_dword(dev, PCI_ROM_ADDRESS, val);
printk("%s: enabling expansion ROM\n", pci_name(dev));
}
}
if (!len || !base)
return -ENXIO;
map->map.bankwidth = 4;
map->map.read = mtd_pci_read32,
map->map.write = mtd_pci_write32,
map->map.size = len;
map->base = ioremap_nocache(base, len);
if (!map->base)
return -ENOMEM;
return 0;
}
static void
intel_dc21285_exit(struct pci_dev *dev, struct map_pci_info *map)
{
u32 val;
if (map->base)
iounmap(map->base);
/*
* We need to undo the PCI BAR2/PCI ROM BAR address alteration.
*/
pci_resource_flags(dev, PCI_ROM_RESOURCE) &= ~IORESOURCE_ROM_ENABLE;
pci_read_config_dword(dev, PCI_ROM_ADDRESS, &val);
val &= ~PCI_ROM_ADDRESS_ENABLE;
pci_write_config_dword(dev, PCI_ROM_ADDRESS, val);
}
static unsigned long
intel_dc21285_translate(struct map_pci_info *map, unsigned long ofs)
{
return ofs & 0x00ffffc0 ? ofs : (ofs ^ (1 << 5));
}
static struct mtd_pci_info intel_dc21285_info = {
.init = intel_dc21285_init,
.exit = intel_dc21285_exit,
.translate = intel_dc21285_translate,
.map_name = "jedec_probe",
};
/*
* PCI device ID table
*/
static struct pci_device_id mtd_pci_ids[] = {
{
.vendor = PCI_VENDOR_ID_INTEL,
.device = 0x530d,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.class = PCI_CLASS_MEMORY_OTHER << 8,
.class_mask = 0xffff00,
.driver_data = (unsigned long)&intel_iq80310_info,
},
{
.vendor = PCI_VENDOR_ID_DEC,
.device = PCI_DEVICE_ID_DEC_21285, .subvendor = 0, /* DC21285 defaults to 0 on reset */
.subdevice = 0, /* DC21285 defaults to 0 on reset */
.driver_data = (unsigned long)&intel_dc21285_info,
},
{ 0, }
};
/*
* Generic code follows.
*/
static int __devinit
mtd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
struct mtd_pci_info *info = (struct mtd_pci_info *)id->driver_data;
struct map_pci_info *map = NULL;
struct mtd_info *mtd = NULL;
int err;
err = pci_enable_device(dev);
if (err)
goto out;
err = pci_request_regions(dev, "pci mtd");
if (err)
goto out;
map = kmalloc(sizeof(*map), GFP_KERNEL);
err = -ENOMEM;
if (!map)
goto release;
map->map = mtd_pci_map;
map->map.name = pci_name(dev);
map->dev = dev;
map->exit = info->exit;
map->translate = info->translate;
err = info->init(dev, map);
if (err)
goto release;
/* tsk - do_map_probe should take const char * */
mtd = do_map_probe((char *)info->map_name, &map->map);
err = -ENODEV;
if (!mtd)
goto release;
mtd->owner = THIS_MODULE;
add_mtd_device(mtd);
pci_set_drvdata(dev, mtd);
return 0;
release:
if (map) {
map->exit(dev, map);
kfree(map);
}
pci_release_regions(dev);
out:
return err;
}
static void __devexit
mtd_pci_remove(struct pci_dev *dev)
{
struct mtd_info *mtd = pci_get_drvdata(dev); struct map_pci_info *map = mtd->priv;
del_mtd_device(mtd);
map_destroy(mtd);
map->exit(dev, map);
kfree(map);
pci_set_drvdata(dev, NULL);
pci_release_regions(dev);
}
static struct pci_driver mtd_pci_driver = {
.name = "MTD PCI",
.probe = mtd_pci_probe,
.remove = __devexit_p(mtd_pci_remove),
.id_table = mtd_pci_ids,
};
static int __init mtd_pci_maps_init(void)
{
return pci_register_driver(&mtd_pci_driver);
}
static void __exit mtd_pci_maps_exit(void)
{
pci_unregister_driver(&mtd_pci_driver);
}
module_init(mtd_pci_maps_init);
module_exit(mtd_pci_maps_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
MODULE_DESCRIPTION("Generic PCI map driver");
MODULE_DEVICE_TABLE(pci, mtd_pci_ids);