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/*
* ichxrom.c
*
* Normal mappings of chips in physical memory
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <asm/io.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/cfi.h>
#include <linux/mtd/flashchip.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/list.h>
#define xstr(s) str(s)
#define str(s) #s
#define MOD_NAME xstr(KBUILD_BASENAME)
#define ADDRESS_NAME_LEN 18
#define ROM_PROBE_STEP_SIZE (64*1024) /* 64KiB */
#define BIOS_CNTL 0x4e
#define FWH_DEC_EN1 0xE3
#define FWH_DEC_EN2 0xF0
#define FWH_SEL1 0xE8
#define FWH_SEL2 0xEE
struct ichxrom_window {
void __iomem* virt;
unsigned long phys;
unsigned long size;
struct list_head maps;
struct resource rsrc;
struct pci_dev *pdev;
};
struct ichxrom_map_info {
struct list_head list;
struct map_info map;
struct mtd_info *mtd;
struct resource rsrc;
char map_name[sizeof(MOD_NAME) + 2 + ADDRESS_NAME_LEN];
};
static struct ichxrom_window ichxrom_window = {
.maps = LIST_HEAD_INIT(ichxrom_window.maps),
};
static void ichxrom_cleanup(struct ichxrom_window *window)
{
struct ichxrom_map_info *map, *scratch;
u16 word;
/* Disable writes through the rom window */
pci_read_config_word(window->pdev, BIOS_CNTL, &word);
pci_write_config_word(window->pdev, BIOS_CNTL, word & ~1);
pci_dev_put(window->pdev);
/* Free all of the mtd devices */
list_for_each_entry_safe(map, scratch, &window->maps, list) {
if (map->rsrc.parent)
release_resource(&map->rsrc);
mtd_device_unregister(map->mtd);
map_destroy(map->mtd);
list_del(&map->list);
kfree(map);
}
if (window->rsrc.parent)
release_resource(&window->rsrc);
if (window->virt) {
iounmap(window->virt);
window->virt = NULL;
window->phys = 0;
window->size = 0;
window->pdev = NULL;
}
}
static int ichxrom_init_one(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
static char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL };
struct ichxrom_window *window = &ichxrom_window;
struct ichxrom_map_info *map = NULL;
unsigned long map_top;
u8 byte;
u16 word;
/* For now I just handle the ichx and I assume there
* are not a lot of resources up at the top of the address
* space. It is possible to handle other devices in the
* top 16MB but it is very painful. Also since
* you can only really attach a FWH to an ICHX there
* a number of simplifications you can make.
*
* Also you can page firmware hubs if an 8MB window isn't enough
* but don't currently handle that case either.
*/
window->pdev = pdev;
/* Find a region continuous to the end of the ROM window */
window->phys = 0;
pci_read_config_byte(pdev, FWH_DEC_EN1, &byte);
if (byte == 0xff) {
window->phys = 0xffc00000;
pci_read_config_byte(pdev, FWH_DEC_EN2, &byte);
if ((byte & 0x0f) == 0x0f) {
window->phys = 0xff400000;
}
else if ((byte & 0x0e) == 0x0e) {
window->phys = 0xff500000;
}
else if ((byte & 0x0c) == 0x0c) {
window->phys = 0xff600000;
}
else if ((byte & 0x08) == 0x08) {
window->phys = 0xff700000;
}
}
else if ((byte & 0xfe) == 0xfe) {
window->phys = 0xffc80000;
}
else if ((byte & 0xfc) == 0xfc) {
window->phys = 0xffd00000;
}
else if ((byte & 0xf8) == 0xf8) {
window->phys = 0xffd80000;
}
else if ((byte & 0xf0) == 0xf0) {
window->phys = 0xffe00000;
}
else if ((byte & 0xe0) == 0xe0) {
window->phys = 0xffe80000;
}
else if ((byte & 0xc0) == 0xc0) {
window->phys = 0xfff00000;
}
else if ((byte & 0x80) == 0x80) {
window->phys = 0xfff80000;
}
if (window->phys == 0) {
printk(KERN_ERR MOD_NAME ": Rom window is closed\n");
goto out;
}
window->phys -= 0x400000UL;
window->size = (0xffffffffUL - window->phys) + 1UL;
/* Enable writes through the rom window */
pci_read_config_word(pdev, BIOS_CNTL, &word);
if (!(word & 1) && (word & (1<<1))) {
/* The BIOS will generate an error if I enable
* this device, so don't even try.
*/
printk(KERN_ERR MOD_NAME ": firmware access control, I can't enable writes\n");
goto out;
}
pci_write_config_word(pdev, BIOS_CNTL, word | 1);
/*
* Try to reserve the window mem region. If this fails then
* it is likely due to the window being "reseved" by the BIOS.
*/
window->rsrc.name = MOD_NAME;
window->rsrc.start = window->phys;
window->rsrc.end = window->phys + window->size - 1;
window->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
if (request_resource(&iomem_resource, &window->rsrc)) {
window->rsrc.parent = NULL;
printk(KERN_DEBUG MOD_NAME ": "
"%s(): Unable to register resource %pR - kernel bug?\n",
__func__, &window->rsrc);
}
/* Map the firmware hub into my address space. */
window->virt = ioremap_nocache(window->phys, window->size);
if (!window->virt) {
printk(KERN_ERR MOD_NAME ": ioremap(%08lx, %08lx) failed\n",
window->phys, window->size);
goto out;
}
/* Get the first address to look for an rom chip at */
map_top = window->phys;
if ((window->phys & 0x3fffff) != 0) {
map_top = window->phys + 0x400000;
}
#if 1
/* The probe sequence run over the firmware hub lock
* registers sets them to 0x7 (no access).
* Probe at most the last 4M of the address space.
*/
if (map_top < 0xffc00000) {
map_top = 0xffc00000;
}
#endif
/* Loop through and look for rom chips */
while((map_top - 1) < 0xffffffffUL) {
struct cfi_private *cfi;
unsigned long offset;
int i;
if (!map) {
map = kmalloc(sizeof(*map), GFP_KERNEL);
}
if (!map) {
printk(KERN_ERR MOD_NAME ": kmalloc failed");
goto out;
}
memset(map, 0, sizeof(*map));
INIT_LIST_HEAD(&map->list);
map->map.name = map->map_name;
map->map.phys = map_top;
offset = map_top - window->phys;
map->map.virt = (void __iomem *)
(((unsigned long)(window->virt)) + offset);
map->map.size = 0xffffffffUL - map_top + 1UL;
/* Set the name of the map to the address I am trying */
sprintf(map->map_name, "%s @%08Lx",
MOD_NAME, (unsigned long long)map->map.phys);
/* Firmware hubs only use vpp when being programmed
* in a factory setting. So in-place programming
* needs to use a different method.
*/
for(map->map.bankwidth = 32; map->map.bankwidth;
map->map.bankwidth >>= 1)
{
char **probe_type;
/* Skip bankwidths that are not supported */
if (!map_bankwidth_supported(map->map.bankwidth))
continue;
/* Setup the map methods */
simple_map_init(&map->map);
/* Try all of the probe methods */
probe_type = rom_probe_types;
for(; *probe_type
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