* amd76xrom.c
*
* Normal mappings of chips in physical memory
- * $Id: amd76xrom.c,v 1.18 2004/11/16 18:29:02 dwmw2 Exp $
+ * $Id: amd76xrom.c,v 1.12 2004/07/14 14:44:31 thayne Exp $
*/
#include <linux/module.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/config.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 */
-
-struct amd76xrom_window {
- void __iomem *virt;
- unsigned long phys;
- unsigned long size;
- struct list_head maps;
- struct resource rsrc;
- struct pci_dev *pdev;
-};
+#define MTD_DEV_NAME_LENGTH 16
struct amd76xrom_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];
+ void __iomem * 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_window amd76xrom_window = {
- .maps = LIST_HEAD_INIT(amd76xrom_window.maps),
+
+static struct amd76xrom_map_info amd76xrom_map = {
+ .map = {
+ .name = MOD_NAME,
+ .size = 0,
+ .bankwidth = 1,
+ }
+ /* remaining fields of structure are initialized to 0 */
};
-static void amd76xrom_cleanup(struct amd76xrom_window *window)
+
+static void amd76xrom_cleanup(struct amd76xrom_map_info *info)
{
- struct amd76xrom_map_info *map, *scratch;
u8 byte;
- if (window->pdev) {
- /* Disable writes through the rom window */
- pci_read_config_byte(window->pdev, 0x40, &byte);
- pci_write_config_byte(window->pdev, 0x40, byte & ~1);
- }
+ /* Disable writes through the rom window */
+ pci_read_config_byte(info->pdev, 0x40, &byte);
+ pci_write_config_byte(info->pdev, 0x40, byte & ~1);
- /* Free all of the mtd devices */
- list_for_each_entry_safe(map, scratch, &window->maps, list) {
- if (map->rsrc.parent) {
- release_resource(&map->rsrc);
- }
- del_mtd_device(map->mtd);
- map_destroy(map->mtd);
- list_del(&map->list);
- kfree(map);
+ if (info->mtd) {
+ del_mtd_device(info->mtd);
+ map_destroy(info->mtd);
+ info->mtd = NULL;
+ info->map.virt = NULL;
}
- 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;
+ 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(info->window_addr);
+ info->window_addr = NULL;
}
}
static int __devinit amd76xrom_init_one (struct pci_dev *pdev,
const struct pci_device_id *ent)
{
+ struct rom_window {
+ u32 start;
+ u32 size;
+ 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 },
+ { 0 , 0, 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", NULL };
u8 byte;
- struct amd76xrom_window *window = &amd76xrom_window;
- struct amd76xrom_map_info *map = NULL;
- unsigned long map_top;
-
- /* Remember the pci dev I find the window in */
- window->pdev = pdev;
+ struct amd76xrom_map_info *info = &amd76xrom_map;
+ struct rom_window *window;
+ int i;
+ u32 rom_size;
+
+ info->pdev = pdev;
+ window = &rom_window[0];
+
+ 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);
+ }
- /* Assume the rom window is properly setup, and find it's size */
- pci_read_config_byte(pdev, 0x43, &byte);
- if ((byte & ((1<<7)|(1<<6))) == ((1<<7)|(1<<6))) {
- window->phys = 0xffb00000; /* 5MiB */
- }
- else if ((byte & (1<<7)) == (1<<7)) {
- window->phys = 0xffc00000; /* 4MiB */
- }
- else {
- window->phys = 0xffff0000; /* 64KiB */
- }
- window->size = 0xffffffffUL - window->phys + 1UL;
-
- /*
- * 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.
- */
- 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_ERR MOD_NAME
- " %s(): Unable to register resource"
- " 0x%.08lx-0x%.08lx - kernel bug?\n",
- __func__,
- window->rsrc.start, window->rsrc.end);
- }
+ /* Enable the selected rom window */
+ pci_read_config_byte(pdev, 0x43, &byte);
+ pci_write_config_byte(pdev, 0x43, byte | window->segen_bits);
-#if 0
+ /* Enable writes through the rom window */
+ pci_read_config_byte(pdev, 0x40, &byte);
+ pci_write_config_byte(pdev, 0x40, byte | 1);
- /* Enable the selected rom window */
- pci_read_config_byte(pdev, 0x43, &byte);
- pci_write_config_byte(pdev, 0x43, byte | rwindow->segen_bits);
-#endif
+ /* FIXME handle registers 0x80 - 0x8C the bios region locks */
- /* 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 */
-
- /* For write accesses caches are useless */
- 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;
- }
+ printk(KERN_NOTICE MOD_NAME " window : %x at %x\n",
+ window->size, window->start);
+ /* For write accesses caches are useless */
+ info->window_addr = ioremap_nocache(window->start,
+ window->size);
- /* Get the first address to look for an rom chip at */
- map_top = window->phys;
-#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;
+ if (!info->window_addr) {
+ printk(KERN_ERR "Failed to ioremap\n");
+ continue;
}
- 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, map->map.phys);
-
- /* There is no generic VPP support */
- 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);
+ info->mtd = NULL;
- /* Try all of the probe methods */
- probe_type = rom_probe_types;
- for(; *probe_type; probe_type++) {
- map->mtd = do_map_probe(*probe_type, &map->map);
- if (map->mtd)
- goto found;
+ 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;
}
- map_top += ROM_PROBE_STEP_SIZE;
- continue;
- found:
- /* Trim the size if we are larger than the map */
- if (map->mtd->size > map->map.size) {
- printk(KERN_WARNING MOD_NAME
- " rom(%u) larger than window(%lu). fixing...\n",
- map->mtd->size, map->map.size);
- map->mtd->size = map->map.size;
- }
- if (window->rsrc.parent) {
+ iounmap(info->window_addr);
+ info->window_addr = NULL;
+
+ /* Disable writes through the rom window */
+ pci_read_config_byte(pdev, 0x40, &byte);
+ pci_write_config_byte(pdev, 0x40, byte & ~1);
+
+ window++;
+ }
+ 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
/*
- * 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.
+ * The BIOS e820 usually reserves this so it isn't
+ * usually an error.
*/
- map->rsrc.name = map->map_name;
- map->rsrc.start = map->map.phys;
- map->rsrc.end = map->map.phys + map->mtd->size - 1;
- map->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
- if (request_resource(&window->rsrc, &map->rsrc)) {
- printk(KERN_ERR MOD_NAME
- ": cannot reserve MTD resource\n");
- map->rsrc.parent = NULL;
- }
+ goto failed;
+#endif
}
+ }
- /* Make the whole region visible in the map */
- map->map.virt = window->virt;
- map->map.phys = window->phys;
- cfi = map->map.fldrv_priv;
- for(i = 0; i < cfi->numchips; i++) {
- cfi->chips[i].start += offset;
+ 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;
}
-
- /* Now that the mtd devices is complete claim and export it */
- map->mtd->owner = THIS_MODULE;
- if (add_mtd_device(map->mtd)) {
- map_destroy(map->mtd);
- map->mtd = NULL;
- goto out;
- }
-
-
- /* Calculate the new value of map_top */
- map_top += map->mtd->size;
-
- /* File away the map structure */
- list_add(&map->list, &window->maps);
- map = NULL;
}
- out:
- /* Free any left over map structures */
- if (map) {
- kfree(map);
- }
- /* See if I have any map structures */
- if (list_empty(&window->maps)) {
- amd76xrom_cleanup(window);
- return -ENODEV;
- }
return 0;
+
+ failed:
+ amd76xrom_cleanup(info);
+ return -ENODEV;
}
static void __devexit amd76xrom_remove_one (struct pci_dev *pdev)
{
- struct amd76xrom_window *window = &amd76xrom_window;
+ struct amd76xrom_map_info *info = &amd76xrom_map;
- amd76xrom_cleanup(window);
+ amd76xrom_cleanup(info);
}
static struct pci_device_id amd76xrom_pci_tbl[] = {
};
#endif
-static int __init init_amd76xrom(void)
+int __init init_amd76xrom(void)
{
struct pci_dev *pdev;
struct pci_device_id *id;
}
}
if (pdev) {
+ amd76xrom_map.pdev = pdev;
return amd76xrom_init_one(pdev, &amd76xrom_pci_tbl[0]);
}
return -ENXIO;
static void __exit cleanup_amd76xrom(void)
{
- amd76xrom_remove_one(amd76xrom_window.pdev);
+ amd76xrom_remove_one(amd76xrom_map.pdev);
}
module_init(init_amd76xrom);