* amd76xrom.c
*
* Normal mappings of chips in physical memory
- * $Id: amd76xrom.c,v 1.12 2004/07/14 14:44:31 thayne Exp $
+ * $Id: amd76xrom.c,v 1.19 2004/11/28 09:40:39 dwmw2 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 MTD_DEV_NAME_LENGTH 16
+#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;
+};
struct amd76xrom_map_info {
+ struct list_head list;
struct map_info map;
struct mtd_info *mtd;
- 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];
+ struct resource rsrc;
+ char map_name[sizeof(MOD_NAME) + 2 + ADDRESS_NAME_LEN];
};
-
-static struct amd76xrom_map_info amd76xrom_map = {
- .map = {
- .name = MOD_NAME,
- .size = 0,
- .bankwidth = 1,
- }
- /* remaining fields of structure are initialized to 0 */
+static struct amd76xrom_window amd76xrom_window = {
+ .maps = LIST_HEAD_INIT(amd76xrom_window.maps),
};
-
-static void amd76xrom_cleanup(struct amd76xrom_map_info *info)
+static void amd76xrom_cleanup(struct amd76xrom_window *window)
{
+ struct amd76xrom_map_info *map, *scratch;
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 (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);
+ }
- if (info->mtd) {
- del_mtd_device(info->mtd);
- map_destroy(info->mtd);
- info->mtd = NULL;
- info->map.virt = NULL;
+ /* 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->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;
+ 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 __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_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);
- }
+ 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;
- /* Enable the selected rom window */
- pci_read_config_byte(pdev, 0x43, &byte);
- pci_write_config_byte(pdev, 0x43, byte | window->segen_bits);
+ /* 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 writes through the rom window */
- pci_read_config_byte(pdev, 0x40, &byte);
- pci_write_config_byte(pdev, 0x40, byte | 1);
+#if 0
- /* FIXME handle registers 0x80 - 0x8C the bios region locks */
+ /* Enable the selected rom window */
+ pci_read_config_byte(pdev, 0x43, &byte);
+ pci_write_config_byte(pdev, 0x43, byte | rwindow->segen_bits);
+#endif
- 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);
+ /* 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;
+ }
- if (!info->window_addr) {
- printk(KERN_ERR "Failed to ioremap\n");
- continue;
+ /* 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;
}
+ 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;
- info->mtd = NULL;
+ /* Setup the map methods */
+ simple_map_init(&map->map);
- 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);
+ /* 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;
}
- if (info->mtd) goto found_mtd;
}
- 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
+ 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) {
/*
- * The BIOS e820 usually reserves this so it isn't
- * usually an error.
+ * 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.
*/
- goto failed;
-#endif
+ 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;
+ }
}
- }
- 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;
+ /* 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;
}
+
+ /* 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_map_info *info = &amd76xrom_map;
+ struct amd76xrom_window *window = &amd76xrom_window;
- amd76xrom_cleanup(info);
+ amd76xrom_cleanup(window);
}
static struct pci_device_id amd76xrom_pci_tbl[] = {
};
#endif
-int __init init_amd76xrom(void)
+static 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_map.pdev);
+ amd76xrom_remove_one(amd76xrom_window.pdev);
}
module_init(init_amd76xrom);
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