pci.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:9k
- /*
- * 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 1.1 2001/09/27 20:28:45 rmk 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/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 *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;
- };
- /*
- * Intel IOP80310 Flash driver
- */
- static int
- intel_iq80310_init(struct pci_dev *dev, struct map_pci_info *map)
- {
- u32 win_base;
- map->map.buswidth = 1;
- 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((void *)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) &
- PCI_ROM_ADDRESS_ENABLE)) {
- u32 val;
- pci_resource_flags(dev, PCI_ROM_RESOURCE) |= PCI_ROM_ADDRESS_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 ROMn", dev->slot_name);
- }
- }
- if (!len || !base)
- return -ENXIO;
- map->map.buswidth = 4;
- 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((void *)map->base);
- /*
- * We need to undo the PCI BAR2/PCI ROM BAR address alteration.
- */
- pci_resource_flags(dev, PCI_ROM_RESOURCE) &= ~PCI_ROM_ADDRESS_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[] __devinitdata = {
- {
- 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 */
- class: 0,
- class_mask: 0,
- driver_data: (unsigned long)&intel_dc21285_info,
- },
- { 0, }
- };
- /*
- * Generic code follows.
- */
- static u8 mtd_pci_read8(struct map_info *_map, unsigned long ofs)
- {
- struct map_pci_info *map = (struct map_pci_info *)_map;
- u8 val = readb(map->base + map->translate(map, ofs));
- // printk("read8 : %08lx => %02xn", ofs, val);
- return val;
- }
- static u16 mtd_pci_read16(struct map_info *_map, unsigned long ofs)
- {
- struct map_pci_info *map = (struct map_pci_info *)_map;
- u16 val = readw(map->base + map->translate(map, ofs));
- // printk("read16: %08lx => %04xn", ofs, val);
- return val;
- }
- static u32 mtd_pci_read32(struct map_info *_map, unsigned long ofs)
- {
- struct map_pci_info *map = (struct map_pci_info *)_map;
- u32 val = readl(map->base + map->translate(map, ofs));
- // printk("read32: %08lx => %08xn", ofs, val);
- 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, u8 val, unsigned long ofs)
- {
- struct map_pci_info *map = (struct map_pci_info *)_map;
- // printk("write8 : %08lx <= %02xn", ofs, val);
- writeb(val, map->base + map->translate(map, ofs));
- }
- static void mtd_pci_write16(struct map_info *_map, u16 val, unsigned long ofs)
- {
- struct map_pci_info *map = (struct map_pci_info *)_map;
- // printk("write16: %08lx <= %04xn", ofs, val);
- writew(val, map->base + map->translate(map, ofs));
- }
- static void mtd_pci_write32(struct map_info *_map, u32 val, unsigned long ofs)
- {
- struct map_pci_info *map = (struct map_pci_info *)_map;
- // printk("write32: %08lx <= %08xn", ofs, val);
- writel(val, 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 struct map_info mtd_pci_map = {
- read8: mtd_pci_read8,
- read16: mtd_pci_read16,
- read32: mtd_pci_read32,
- copy_from: mtd_pci_copyfrom,
- write8: mtd_pci_write8,
- write16: mtd_pci_write16,
- write32: mtd_pci_write32,
- copy_to: mtd_pci_copyto,
- };
- 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 = dev->slot_name;
- 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->module = THIS_MODULE;
- add_mtd_device(mtd);
- pci_set_drvdata(dev, mtd);
- return 0;
- release:
- if (mtd)
- map_destroy(mtd);
- 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: mtd_pci_remove,
- id_table: mtd_pci_ids,
- };
- static int __init mtd_pci_maps_init(void)
- {
- return pci_module_init(&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);