* amd76xrom.c
*
* Normal mappings of chips in physical memory
- * $Id: amd76xrom.c,v 1.8 2003/05/28 15:44:28 dwmw2 Exp $
+ * $Id: amd76xrom.c,v 1.12 2004/07/14 14:44:31 thayne Exp $
*/
#include <linux/module.h>
#include <linux/pci_ids.h>
+#define xstr(s) str(s)
+#define str(s) #s
+#define MOD_NAME xstr(KBUILD_BASENAME)
+
+#define MTD_DEV_NAME_LENGTH 16
+
struct amd76xrom_map_info {
struct map_info map;
struct mtd_info *mtd;
unsigned long window_addr;
u32 window_start, window_size;
struct pci_dev *pdev;
+ struct resource window_rsrc;
+ struct resource rom_rsrc;
+ char mtd_name[MTD_DEV_NAME_LENGTH];
};
static struct amd76xrom_map_info amd76xrom_map = {
.map = {
- .name = "AMD76X rom",
+ .name = MOD_NAME,
.size = 0,
- .buswidth = 1,
- },
- .mtd = 0,
- .window_addr = 0,
+ .bankwidth = 1,
+ }
+ /* remaining fields of structure are initialized to 0 */
};
+
+static void amd76xrom_cleanup(struct amd76xrom_map_info *info)
+{
+ u8 byte;
+
+ /* Disable writes through the rom window */
+ pci_read_config_byte(info->pdev, 0x40, &byte);
+ pci_write_config_byte(info->pdev, 0x40, byte & ~1);
+
+ if (info->mtd) {
+ del_mtd_device(info->mtd);
+ map_destroy(info->mtd);
+ info->mtd = NULL;
+ info->map.virt = 0;
+ }
+ if (info->rom_rsrc.parent)
+ release_resource(&info->rom_rsrc);
+ if (info->window_rsrc.parent)
+ release_resource(&info->window_rsrc);
+
+ if (info->window_addr) {
+ iounmap((void *)(info->window_addr));
+ info->window_addr = 0;
+ }
+}
+
+
static int __devinit amd76xrom_init_one (struct pci_dev *pdev,
const struct pci_device_id *ent)
{
u8 segen_bits;
};
static struct rom_window rom_window[] = {
+ /*
+ * Need the 5MiB window for chips that have block lock/unlock
+ * registers located below 4MiB window.
+ */
{ 0xffb00000, 5*1024*1024, (1<<7) | (1<<6), },
{ 0xffc00000, 4*1024*1024, (1<<7), },
{ 0xffff0000, 64*1024, 0 },
static const u32 rom_probe_sizes[] = {
5*1024*1024, 4*1024*1024, 2*1024*1024, 1024*1024, 512*1024,
256*1024, 128*1024, 64*1024, 0};
- static char *rom_probe_types[] = { "cfi_probe", "jedec_probe", 0 };
+ static char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL };
u8 byte;
struct amd76xrom_map_info *info = &amd76xrom_map;
struct rom_window *window;
int i;
u32 rom_size;
+ info->pdev = pdev;
window = &rom_window[0];
- /* disabled because it fights with BIOS reserved regions */
-#define REQUEST_MEM_REGION 0
-#if REQUEST_MEM_REGION
- while(window->size) {
- if (request_mem_region(window->start, window->size, "amd76xrom")) {
- break;
+ while (window->size) {
+ /*
+ * Try to reserve the window mem region. If this fails then
+ * it is likely due to a fragment of the window being
+ * "reseved" by the BIOS. In the case that the
+ * request_mem_region() fails then once the rom size is
+ * discovered we will try to reserve the unreserved fragment.
+ */
+ info->window_rsrc.name = MOD_NAME;
+ info->window_rsrc.start = window->start;
+ info->window_rsrc.end = window->start + window->size - 1;
+ info->window_rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+ if (request_resource(&iomem_resource, &info->window_rsrc)) {
+ info->window_rsrc.parent = NULL;
+ printk(KERN_ERR MOD_NAME
+ " %s(): Unable to register resource"
+ " 0x%.08lx-0x%.08lx - kernel bug?\n",
+ __func__,
+ info->window_rsrc.start, info->window_rsrc.end);
}
- window++;
- }
- if (!window->size) {
- printk(KERN_ERR "amd76xrom: cannot reserve rom window\n");
- goto err_out_none;
- }
-#endif /* REQUEST_MEM_REGION */
- /* Enable the selected rom window */
- pci_read_config_byte(pdev, 0x43, &byte);
- pci_write_config_byte(pdev, 0x43, byte | window->segen_bits);
+ /* Enable the selected rom window */
+ pci_read_config_byte(pdev, 0x43, &byte);
+ pci_write_config_byte(pdev, 0x43, byte | window->segen_bits);
- /* Enable writes through the rom window */
- pci_read_config_byte(pdev, 0x40, &byte);
- pci_write_config_byte(pdev, 0x40, byte | 1);
+ /* Enable writes through the rom window */
+ pci_read_config_byte(pdev, 0x40, &byte);
+ pci_write_config_byte(pdev, 0x40, byte | 1);
- /* FIXME handle registers 0x80 - 0x8C the bios region locks */
+ /* FIXME handle registers 0x80 - 0x8C the bios region locks */
- printk(KERN_NOTICE "amd76xrom window : %x at %x\n",
- window->size, window->start);
- /* For write accesses caches are useless */
- info->window_addr = (unsigned long)ioremap_nocache(window->start, window->size);
+ printk(KERN_NOTICE MOD_NAME " window : %x at %x\n",
+ window->size, window->start);
+ /* For write accesses caches are useless */
+ info->window_addr =
+ (unsigned long)ioremap_nocache(window->start,
+ window->size);
- if (!info->window_addr) {
- printk(KERN_ERR "Failed to ioremap\n");
- goto err_out_free_mmio_region;
- }
- info->mtd = 0;
- for(i = 0; (rom_size = rom_probe_sizes[i]); i++) {
- char **chip_type;
- if (rom_size > window->size) {
+ if (!info->window_addr) {
+ printk(KERN_ERR "Failed to ioremap\n");
continue;
}
- info->map.phys = window->start + window->size - rom_size;
- info->map.virt =
- info->window_addr + window->size - rom_size;
- info->map.size = rom_size;
- simple_map_init(&info->map);
- chip_type = rom_probe_types;
- for(; !info->mtd && *chip_type; chip_type++) {
- info->mtd = do_map_probe(*chip_type, &amd76xrom_map.map);
- }
- if (info->mtd) {
- break;
+
+ info->mtd = NULL;
+
+ for(i = 0; (rom_size = rom_probe_sizes[i]); i++) {
+ char **chip_type;
+ if (rom_size > window->size) {
+ continue;
+ }
+ info->map.phys = window->start + window->size - rom_size;
+ info->map.virt =
+ info->window_addr + window->size - rom_size;
+ info->map.size = rom_size;
+ simple_map_init(&info->map);
+ chip_type = rom_probe_types;
+ for(; !info->mtd && *chip_type; chip_type++) {
+ info->mtd = do_map_probe(*chip_type, &amd76xrom_map.map);
+ }
+ if (info->mtd) goto found_mtd;
}
+ iounmap((void *)(info->window_addr));
+ info->window_addr = 0;
+
+ /* Disable writes through the rom window */
+ pci_read_config_byte(pdev, 0x40, &byte);
+ pci_write_config_byte(pdev, 0x40, byte & ~1);
+
+ window++;
}
- if (!info->mtd) {
- goto err_out_iounmap;
- }
- printk(KERN_NOTICE "amd76xrom chip at offset: 0x%x\n",
+ goto failed;
+
+ found_mtd:
+ printk(KERN_NOTICE MOD_NAME " chip at offset: 0x%x\n",
window->size - rom_size);
-
+
info->mtd->owner = THIS_MODULE;
+
+ if (!info->window_rsrc.parent) {
+ /* failed to reserve entire window - try fragments */
+ info->window_rsrc.name = MOD_NAME;
+ info->window_rsrc.start = window->start;
+ info->window_rsrc.end = window->start + window->size - rom_size - 1;
+ info->window_rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+ if (request_resource(&iomem_resource, &info->window_rsrc)) {
+ printk(KERN_ERR MOD_NAME
+ ": cannot reserve window resource fragment\n");
+#if 0
+ /*
+ * The BIOS e820 usually reserves this so it isn't
+ * usually an error.
+ */
+ goto failed;
+#endif
+ }
+ }
+
add_mtd_device(info->mtd);
info->window_start = window->start;
info->window_size = window->size;
+
+ if (info->window_rsrc.parent) {
+ /*
+ * Registering the MTD device in iomem may not be possible
+ * if there is a BIOS "reserved" and BUSY range. If this
+ * fails then continue anyway.
+ */
+ snprintf(info->mtd_name, MTD_DEV_NAME_LENGTH,
+ "mtd%d", info->mtd->index);
+
+ info->rom_rsrc.name = info->mtd_name;
+ info->rom_rsrc.start = window->start + window->size - rom_size;
+ info->rom_rsrc.end = window->start + window->size - 1;
+ info->rom_rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+ if (request_resource(&info->window_rsrc, &info->rom_rsrc)) {
+ printk(KERN_ERR MOD_NAME
+ ": cannot reserve MTD resource\n");
+ info->rom_rsrc.parent = NULL;
+ }
+ }
+
return 0;
-err_out_iounmap:
- iounmap((void *)(info->window_addr));
-err_out_free_mmio_region:
-#if REQUEST_MEM_REGION
- release_mem_region(window->start, window->size);
-err_out_none:
-#endif /* REQUEST_MEM_REGION */
+ failed:
+ amd76xrom_cleanup(info);
return -ENODEV;
}
static void __devexit amd76xrom_remove_one (struct pci_dev *pdev)
{
struct amd76xrom_map_info *info = &amd76xrom_map;
- u8 byte;
-
- del_mtd_device(info->mtd);
- map_destroy(info->mtd);
- info->mtd = 0;
- info->map.virt = 0;
-
- iounmap((void *)(info->window_addr));
- info->window_addr = 0;
-
- /* Disable writes through the rom window */
- pci_read_config_byte(pdev, 0x40, &byte);
- pci_write_config_byte(pdev, 0x40, byte & ~1);
-#if REQUEST_MEM_REGION
- release_mem_region(info->window_start, info->window_size);
-#endif /* REQUEST_MEM_REGION */
+ amd76xrom_cleanup(info);
}
static struct pci_device_id amd76xrom_pci_tbl[] = {
#if 0
static struct pci_driver amd76xrom_driver = {
- .name = "amd76xrom",
+ .name = MOD_NAME,
.id_table = amd76xrom_pci_tbl,
.probe = amd76xrom_init_one,
.remove = amd76xrom_remove_one,
{
struct pci_dev *pdev;
struct pci_device_id *id;
- pdev = 0;
+ pdev = NULL;
for(id = amd76xrom_pci_tbl; id->vendor; id++) {
- pdev = pci_find_device(id->vendor, id->device, 0);
+ pdev = pci_find_device(id->vendor, id->device, NULL);
if (pdev) {
break;
}
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