1 // SPDX-License-Identifier: GPL-2.0-only
5  * Normal mappings of chips in physical memory
48 /* The 2 bits controlling the window size are often set to allow reading
54  * This parameter allows the normal driver to over-ride the BIOS settings.
56  * The bits are 6 and 7.  If both bits are set, it is a 5MiB window.
57  * If only the 7 Bit is set, it is a 4MiB window.  Otherwise, a
58  * 64KiB window.
63 MODULE_PARM_DESC(win_size_bits, "ROM window size bits override for 0x43 byte, normally set by BIOS.…
69 static void amd76xrom_cleanup(struct amd76xrom_window *window)  in amd76xrom_cleanup()  argument
74 	if (window->pdev) {  in amd76xrom_cleanup()
75 		/* Disable writes through the rom window */  in amd76xrom_cleanup()
76 		pci_read_config_byte(window->pdev, 0x40, &byte);  in amd76xrom_cleanup()
77 		pci_write_config_byte(window->pdev, 0x40, byte & ~1);  in amd76xrom_cleanup()
78 		pci_dev_put(window->pdev);  in amd76xrom_cleanup()
81 	/* Free all of the mtd devices */  in amd76xrom_cleanup()
82 	list_for_each_entry_safe(map, scratch, &window->maps, list) {  in amd76xrom_cleanup()
83 		if (map->rsrc.parent) {  in amd76xrom_cleanup()
84 			release_resource(&map->rsrc);  in amd76xrom_cleanup()
86 		mtd_device_unregister(map->mtd);  in amd76xrom_cleanup()
87 		map_destroy(map->mtd);  in amd76xrom_cleanup()
88 		list_del(&map->list);  in amd76xrom_cleanup()
91 	if (window->rsrc.parent)  in amd76xrom_cleanup()
92 		release_resource(&window->rsrc);  in amd76xrom_cleanup()
94 	if (window->virt) {  in amd76xrom_cleanup()
95 		iounmap(window->virt);  in amd76xrom_cleanup()
96 		window->virt = NULL;  in amd76xrom_cleanup()
97 		window->phys = 0;  in amd76xrom_cleanup()
98 		window->size = 0;  in amd76xrom_cleanup()
99 		window->pdev = NULL;  in amd76xrom_cleanup()
109 	struct amd76xrom_window *window = &amd76xrom_window;  in amd76xrom_init_one()  local
113 	/* Remember the pci dev I find the window in - already have a ref */  in amd76xrom_init_one()
114 	window->pdev = pdev;  in amd76xrom_init_one()
116 	/* Enable the selected rom window.  This is often incorrectly  in amd76xrom_init_one()
118 	 * requires the full 5MiB of window space.  in amd76xrom_init_one()
121 	 * other uses of the hardware info.  in amd76xrom_init_one()
126 	/* Assume the rom window is properly setup, and find it's size */  in amd76xrom_init_one()
129 		window->phys = 0xffb00000; /* 5MiB */  in amd76xrom_init_one()
132 		window->phys = 0xffc00000; /* 4MiB */  in amd76xrom_init_one()
135 		window->phys = 0xffff0000; /* 64KiB */  in amd76xrom_init_one()
137 	window->size = 0xffffffffUL - window->phys + 1UL;  in amd76xrom_init_one()
140 	 * Try to reserve the window mem region.  If this fails then  in amd76xrom_init_one()
141 	 * it is likely due to a fragment of the window being  in amd76xrom_init_one()
146 	window->rsrc.name = MOD_NAME;  in amd76xrom_init_one()
147 	window->rsrc.start = window->phys;  in amd76xrom_init_one()
148 	window->rsrc.end   = window->phys + window->size - 1;  in amd76xrom_init_one()
149 	window->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;  in amd76xrom_init_one()
150 	if (request_resource(&iomem_resource, &window->rsrc)) {  in amd76xrom_init_one()
151 		window->rsrc.parent = NULL;  in amd76xrom_init_one()
153 		       " %s(): Unable to register resource %pR - kernel bug?\n",  in amd76xrom_init_one()
154 		       __func__, &window->rsrc);  in amd76xrom_init_one()
155 		return -EBUSY;  in amd76xrom_init_one()
159 	/* Enable writes through the rom window */  in amd76xrom_init_one()
163 	/* FIXME handle registers 0x80 - 0x8C the bios region locks */  in amd76xrom_init_one()
166 	window->virt = ioremap(window->phys, window->size);  in amd76xrom_init_one()
167 	if (!window->virt) {  in amd76xrom_init_one()
169 			window->phys, window->size);  in amd76xrom_init_one()
170 		goto out;  in amd76xrom_init_one()
174 	map_top = window->phys;  in amd76xrom_init_one()
178 	 * Probe at most the last 4M of the address space.  in amd76xrom_init_one()
185 	while((map_top - 1) < 0xffffffffUL) {  in amd76xrom_init_one()
193 				goto out;  in amd76xrom_init_one()
196 		INIT_LIST_HEAD(&map->list);  in amd76xrom_init_one()
197 		map->map.name = map->map_name;  in amd76xrom_init_one()
198 		map->map.phys = map_top;  in amd76xrom_init_one()
199 		offset = map_top - window->phys;  in amd76xrom_init_one()
200 		map->map.virt = (void __iomem *)  in amd76xrom_init_one()
201 			(((unsigned long)(window->virt)) + offset);  in amd76xrom_init_one()
202 		map->map.size = 0xffffffffUL - map_top + 1UL;  in amd76xrom_init_one()
203 		/* Set the name of the map to the address I am trying */  in amd76xrom_init_one()
204 		sprintf(map->map_name, "%s @%08Lx",  in amd76xrom_init_one()
205 			MOD_NAME, (unsigned long long)map->map.phys);  in amd76xrom_init_one()
208 		for(map->map.bankwidth = 32; map->map.bankwidth;  in amd76xrom_init_one()
209 			map->map.bankwidth >>= 1)  in amd76xrom_init_one()
213 			if (!map_bankwidth_supported(map->map.bankwidth))  in amd76xrom_init_one()
217 			simple_map_init(&map->map);  in amd76xrom_init_one()
219 			/* Try all of the probe methods */  in amd76xrom_init_one()
222 				map->mtd = do_map_probe(*probe_type, &map->map);  in amd76xrom_init_one()
223 				if (map->mtd)  in amd76xrom_init_one()
231 		if (map->mtd->size > map->map.size) {  in amd76xrom_init_one()
233 				" rom(%llu) larger than window(%lu). fixing...\n",  in amd76xrom_init_one()
234 				(unsigned long long)map->mtd->size, map->map.size);  in amd76xrom_init_one()
235 			map->mtd->size = map->map.size;  in amd76xrom_init_one()
237 		if (window->rsrc.parent) {  in amd76xrom_init_one()
243 			map->rsrc.name  = map->map_name;  in amd76xrom_init_one()
244 			map->rsrc.start = map->map.phys;  in amd76xrom_init_one()
245 			map->rsrc.end   = map->map.phys + map->mtd->size - 1;  in amd76xrom_init_one()
246 			map->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;  in amd76xrom_init_one()
247 			if (request_resource(&window->rsrc, &map->rsrc)) {  in amd76xrom_init_one()
250 				map->rsrc.parent = NULL;  in amd76xrom_init_one()
255 		map->map.virt = window->virt;  in amd76xrom_init_one()
256 		map->map.phys = window->phys;  in amd76xrom_init_one()
257 		cfi = map->map.fldrv_priv;  in amd76xrom_init_one()
258 		for(i = 0; i < cfi->numchips; i++) {  in amd76xrom_init_one()
259 			cfi->chips[i].start += offset;  in amd76xrom_init_one()
263 		map->mtd->owner = THIS_MODULE;  in amd76xrom_init_one()
264 		if (mtd_device_register(map->mtd, NULL, 0)) {  in amd76xrom_init_one()
265 			map_destroy(map->mtd);  in amd76xrom_init_one()
266 			map->mtd = NULL;  in amd76xrom_init_one()
267 			goto out;  in amd76xrom_init_one()
271 		/* Calculate the new value of map_top */  in amd76xrom_init_one()
272 		map_top += map->mtd->size;  in amd76xrom_init_one()
275 		list_add(&map->list, &window->maps);  in amd76xrom_init_one()
279  out:  in amd76xrom_init_one()
283 	if (list_empty(&window->maps)) {  in amd76xrom_init_one()
284 		amd76xrom_cleanup(window);  in amd76xrom_init_one()
285 		return -ENODEV;  in amd76xrom_init_one()
293 	struct amd76xrom_window *window = &amd76xrom_window;  in amd76xrom_remove_one()  local
295 	amd76xrom_cleanup(window);  in amd76xrom_remove_one()
323 	for(id = amd76xrom_pci_tbl; id->vendor; id++) {  in init_amd76xrom()
324 		pdev = pci_get_device(id->vendor, id->device, NULL);  in init_amd76xrom()
332 	return -ENXIO;  in init_amd76xrom()