* 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 1.21 2005/11/07 11:14:26 gleixner Exp $
*/
#include <linux/module.h>
#include <linux/types.h>
+#include <linux/version.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/io.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
-#include <linux/config.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 */
+
+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;
- unsigned long window_addr;
- u32 window_start, window_size;
- struct pci_dev *pdev;
+ struct resource rsrc;
+ char map_name[sizeof(MOD_NAME) + 2 + ADDRESS_NAME_LEN];
};
+/* The 2 bits controlling the window size are often set to allow reading
+ * the BIOS, but too small to allow writing, since the lock registers are
+ * 4MiB lower in the address space than the data.
+ *
+ * This is intended to prevent flashing the bios, perhaps accidentally.
+ *
+ * This parameter allows the normal driver to over-ride the BIOS settings.
+ *
+ * The bits are 6 and 7. If both bits are set, it is a 5MiB window.
+ * If only the 7 Bit is set, it is a 4MiB window. Otherwise, a
+ * 64KiB window.
+ *
+ */
+static uint win_size_bits;
+module_param(win_size_bits, uint, 0);
+MODULE_PARM_DESC(win_size_bits, "ROM window size bits override for 0x43 byte, normally set by BIOS.");
-static struct amd76xrom_map_info amd76xrom_map = {
- .map = {
- .name = "AMD76X rom",
- .size = 0,
- .buswidth = 1,
- },
- .mtd = 0,
- .window_addr = 0,
+static struct amd76xrom_window amd76xrom_window = {
+ .maps = LIST_HEAD_INIT(amd76xrom_window.maps),
};
-static int __devinit amd76xrom_init_one (struct pci_dev *pdev,
- const struct pci_device_id *ent)
+static void amd76xrom_cleanup(struct amd76xrom_window *window)
{
- struct rom_window {
- u32 start;
- u32 size;
- u8 segen_bits;
- };
- static struct rom_window rom_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", 0 };
+ struct amd76xrom_map_info *map, *scratch;
u8 byte;
- struct amd76xrom_map_info *info = &amd76xrom_map;
- struct rom_window *window;
- int i;
- u32 rom_size;
-
- 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;
+
+ 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);
+ 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);
}
- window++;
+ del_mtd_device(map->mtd);
+ map_destroy(map->mtd);
+ list_del(&map->list);
+ kfree(map);
}
- if (!window->size) {
- printk(KERN_ERR "amd76xrom: cannot reserve rom window\n");
- goto err_out_none;
+ 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;
}
-#endif /* REQUEST_MEM_REGION */
+}
+
+
+static int __devinit amd76xrom_init_one (struct pci_dev *pdev,
+ const struct pci_device_id *ent)
+{
+ 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 - already have a ref */
+ window->pdev = pdev;
+
+ /* Enable the selected rom window. This is often incorrectly
+ * set up by the BIOS, and the 4MiB offset for the lock registers
+ * requires the full 5MiB of window space.
+ *
+ * This 'write, then read' approach leaves the bits for
+ * other uses of the hardware info.
+ */
+ pci_read_config_byte(pdev, 0x43, &byte);
+ pci_write_config_byte(pdev, 0x43, byte | win_size_bits );
- /* Enable the selected rom window */
+ /* Assume the rom window is properly setup, and find it's size */
pci_read_config_byte(pdev, 0x43, &byte);
- pci_write_config_byte(pdev, 0x43, byte | window->segen_bits);
+ 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%.16llx-0x%.16llx - kernel bug?\n",
+ __func__,
+ (unsigned long long)window->rsrc.start,
+ (unsigned long long)window->rsrc.end);
+ }
+
/* Enable writes through the rom window */
pci_read_config_byte(pdev, 0x40, &byte);
/* 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);
+ 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");
- goto err_out_free_mmio_region;
+ /* 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;
}
- info->mtd = 0;
- for(i = 0; (rom_size = rom_probe_sizes[i]); i++) {
- char **chip_type;
- if (rom_size > window->size) {
- continue;
+#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);
}
- 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 (!map) {
+ printk(KERN_ERR MOD_NAME ": kmalloc failed");
+ goto out;
}
- if (info->mtd) {
- break;
+ 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);
+
+ /* 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;
+ }
+ }
+ 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) {
+ /*
+ * 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.
+ */
+ 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;
+ }
}
+
+ /* 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;
}
- if (!info->mtd) {
- goto err_out_iounmap;
+
+ out:
+ /* Free any left over map structures */
+ kfree(map);
+ /* See if I have any map structures */
+ if (list_empty(&window->maps)) {
+ amd76xrom_cleanup(window);
+ return -ENODEV;
}
- printk(KERN_NOTICE "amd76xrom chip at offset: 0x%x\n",
- window->size - rom_size);
-
- info->mtd->owner = THIS_MODULE;
- add_mtd_device(info->mtd);
- info->window_start = window->start;
- info->window_size = window->size;
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 */
- 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);
+ struct amd76xrom_window *window = &amd76xrom_window;
-#if REQUEST_MEM_REGION
- release_mem_region(info->window_start, info->window_size);
-#endif /* REQUEST_MEM_REGION */
+ amd76xrom_cleanup(window);
}
static struct pci_device_id amd76xrom_pci_tbl[] = {
- { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7410,
+ { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7410,
PCI_ANY_ID, PCI_ANY_ID, },
- { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7440,
+ { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7440,
PCI_ANY_ID, PCI_ANY_ID, },
{ PCI_VENDOR_ID_AMD, 0x7468 }, /* amd8111 support */
{ 0, }
#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,
};
#endif
-int __init init_amd76xrom(void)
+static int __init init_amd76xrom(void)
{
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_get_device(id->vendor, id->device, NULL);
if (pdev) {
break;
}
}
if (pdev) {
- amd76xrom_map.pdev = pdev;
return amd76xrom_init_one(pdev, &amd76xrom_pci_tbl[0]);
}
return -ENXIO;
#if 0
- return pci_module_init(&amd76xrom_driver);
+ return pci_register_driver(&amd76xrom_driver);
#endif
}
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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