4 * Normal mappings of chips in physical memory
5 * $Id: amd76xrom.c,v 1.19 2004/11/28 09:40:39 dwmw2 Exp $
8 #include <linux/module.h>
9 #include <linux/types.h>
10 #include <linux/kernel.h>
11 #include <linux/init.h>
13 #include <linux/mtd/mtd.h>
14 #include <linux/mtd/map.h>
15 #include <linux/mtd/cfi.h>
16 #include <linux/mtd/flashchip.h>
17 #include <linux/config.h>
18 #include <linux/pci.h>
19 #include <linux/pci_ids.h>
20 #include <linux/list.h>
23 #define xstr(s) str(s)
25 #define MOD_NAME xstr(KBUILD_BASENAME)
27 #define ADDRESS_NAME_LEN 18
29 #define ROM_PROBE_STEP_SIZE (64*1024) /* 64KiB */
31 struct amd76xrom_window {
35 struct list_head maps;
40 struct amd76xrom_map_info {
41 struct list_head list;
45 char map_name[sizeof(MOD_NAME) + 2 + ADDRESS_NAME_LEN];
48 static struct amd76xrom_window amd76xrom_window = {
49 .maps = LIST_HEAD_INIT(amd76xrom_window.maps),
52 static void amd76xrom_cleanup(struct amd76xrom_window *window)
54 struct amd76xrom_map_info *map, *scratch;
58 /* Disable writes through the rom window */
59 pci_read_config_byte(window->pdev, 0x40, &byte);
60 pci_write_config_byte(window->pdev, 0x40, byte & ~1);
63 /* Free all of the mtd devices */
64 list_for_each_entry_safe(map, scratch, &window->maps, list) {
65 if (map->rsrc.parent) {
66 release_resource(&map->rsrc);
68 del_mtd_device(map->mtd);
69 map_destroy(map->mtd);
73 if (window->rsrc.parent)
74 release_resource(&window->rsrc);
77 iounmap(window->virt);
86 static int __devinit amd76xrom_init_one (struct pci_dev *pdev,
87 const struct pci_device_id *ent)
89 static char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL };
91 struct amd76xrom_window *window = &amd76xrom_window;
92 struct amd76xrom_map_info *map = NULL;
93 unsigned long map_top;
95 /* Remember the pci dev I find the window in */
98 /* Assume the rom window is properly setup, and find it's size */
99 pci_read_config_byte(pdev, 0x43, &byte);
100 if ((byte & ((1<<7)|(1<<6))) == ((1<<7)|(1<<6))) {
101 window->phys = 0xffb00000; /* 5MiB */
103 else if ((byte & (1<<7)) == (1<<7)) {
104 window->phys = 0xffc00000; /* 4MiB */
107 window->phys = 0xffff0000; /* 64KiB */
109 window->size = 0xffffffffUL - window->phys + 1UL;
112 * Try to reserve the window mem region. If this fails then
113 * it is likely due to a fragment of the window being
114 * "reseved" by the BIOS. In the case that the
115 * request_mem_region() fails then once the rom size is
116 * discovered we will try to reserve the unreserved fragment.
118 window->rsrc.name = MOD_NAME;
119 window->rsrc.start = window->phys;
120 window->rsrc.end = window->phys + window->size - 1;
121 window->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
122 if (request_resource(&iomem_resource, &window->rsrc)) {
123 window->rsrc.parent = NULL;
124 printk(KERN_ERR MOD_NAME
125 " %s(): Unable to register resource"
126 " 0x%.08lx-0x%.08lx - kernel bug?\n",
128 window->rsrc.start, window->rsrc.end);
133 /* Enable the selected rom window */
134 pci_read_config_byte(pdev, 0x43, &byte);
135 pci_write_config_byte(pdev, 0x43, byte | rwindow->segen_bits);
138 /* Enable writes through the rom window */
139 pci_read_config_byte(pdev, 0x40, &byte);
140 pci_write_config_byte(pdev, 0x40, byte | 1);
142 /* FIXME handle registers 0x80 - 0x8C the bios region locks */
144 /* For write accesses caches are useless */
145 window->virt = ioremap_nocache(window->phys, window->size);
147 printk(KERN_ERR MOD_NAME ": ioremap(%08lx, %08lx) failed\n",
148 window->phys, window->size);
152 /* Get the first address to look for an rom chip at */
153 map_top = window->phys;
155 /* The probe sequence run over the firmware hub lock
156 * registers sets them to 0x7 (no access).
157 * Probe at most the last 4M of the address space.
159 if (map_top < 0xffc00000) {
160 map_top = 0xffc00000;
163 /* Loop through and look for rom chips */
164 while((map_top - 1) < 0xffffffffUL) {
165 struct cfi_private *cfi;
166 unsigned long offset;
170 map = kmalloc(sizeof(*map), GFP_KERNEL);
173 printk(KERN_ERR MOD_NAME ": kmalloc failed");
176 memset(map, 0, sizeof(*map));
177 INIT_LIST_HEAD(&map->list);
178 map->map.name = map->map_name;
179 map->map.phys = map_top;
180 offset = map_top - window->phys;
181 map->map.virt = (void __iomem *)
182 (((unsigned long)(window->virt)) + offset);
183 map->map.size = 0xffffffffUL - map_top + 1UL;
184 /* Set the name of the map to the address I am trying */
185 sprintf(map->map_name, "%s @%08lx",
186 MOD_NAME, map->map.phys);
188 /* There is no generic VPP support */
189 for(map->map.bankwidth = 32; map->map.bankwidth;
190 map->map.bankwidth >>= 1)
193 /* Skip bankwidths that are not supported */
194 if (!map_bankwidth_supported(map->map.bankwidth))
197 /* Setup the map methods */
198 simple_map_init(&map->map);
200 /* Try all of the probe methods */
201 probe_type = rom_probe_types;
202 for(; *probe_type; probe_type++) {
203 map->mtd = do_map_probe(*probe_type, &map->map);
208 map_top += ROM_PROBE_STEP_SIZE;
211 /* Trim the size if we are larger than the map */
212 if (map->mtd->size > map->map.size) {
213 printk(KERN_WARNING MOD_NAME
214 " rom(%u) larger than window(%lu). fixing...\n",
215 map->mtd->size, map->map.size);
216 map->mtd->size = map->map.size;
218 if (window->rsrc.parent) {
220 * Registering the MTD device in iomem may not be possible
221 * if there is a BIOS "reserved" and BUSY range. If this
222 * fails then continue anyway.
224 map->rsrc.name = map->map_name;
225 map->rsrc.start = map->map.phys;
226 map->rsrc.end = map->map.phys + map->mtd->size - 1;
227 map->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
228 if (request_resource(&window->rsrc, &map->rsrc)) {
229 printk(KERN_ERR MOD_NAME
230 ": cannot reserve MTD resource\n");
231 map->rsrc.parent = NULL;
235 /* Make the whole region visible in the map */
236 map->map.virt = window->virt;
237 map->map.phys = window->phys;
238 cfi = map->map.fldrv_priv;
239 for(i = 0; i < cfi->numchips; i++) {
240 cfi->chips[i].start += offset;
243 /* Now that the mtd devices is complete claim and export it */
244 map->mtd->owner = THIS_MODULE;
245 if (add_mtd_device(map->mtd)) {
246 map_destroy(map->mtd);
252 /* Calculate the new value of map_top */
253 map_top += map->mtd->size;
255 /* File away the map structure */
256 list_add(&map->list, &window->maps);
261 /* Free any left over map structures */
265 /* See if I have any map structures */
266 if (list_empty(&window->maps)) {
267 amd76xrom_cleanup(window);
274 static void __devexit amd76xrom_remove_one (struct pci_dev *pdev)
276 struct amd76xrom_window *window = &amd76xrom_window;
278 amd76xrom_cleanup(window);
281 static struct pci_device_id amd76xrom_pci_tbl[] = {
282 { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7410,
283 PCI_ANY_ID, PCI_ANY_ID, },
284 { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7440,
285 PCI_ANY_ID, PCI_ANY_ID, },
286 { PCI_VENDOR_ID_AMD, 0x7468 }, /* amd8111 support */
290 MODULE_DEVICE_TABLE(pci, amd76xrom_pci_tbl);
293 static struct pci_driver amd76xrom_driver = {
295 .id_table = amd76xrom_pci_tbl,
296 .probe = amd76xrom_init_one,
297 .remove = amd76xrom_remove_one,
301 static int __init init_amd76xrom(void)
303 struct pci_dev *pdev;
304 struct pci_device_id *id;
306 for(id = amd76xrom_pci_tbl; id->vendor; id++) {
307 pdev = pci_find_device(id->vendor, id->device, NULL);
313 return amd76xrom_init_one(pdev, &amd76xrom_pci_tbl[0]);
317 return pci_module_init(&amd76xrom_driver);
321 static void __exit cleanup_amd76xrom(void)
323 amd76xrom_remove_one(amd76xrom_window.pdev);
326 module_init(init_amd76xrom);
327 module_exit(cleanup_amd76xrom);
329 MODULE_LICENSE("GPL");
330 MODULE_AUTHOR("Eric Biederman <ebiederman@lnxi.com>");
331 MODULE_DESCRIPTION("MTD map driver for BIOS chips on the AMD76X southbridge");