mtd/maps/ck804xrom.c

54  * The 2 bits controlling the window size are often set to allow reading
62  * The bits are 6 and 7.  If both bits are set, it is a 5MiB window.
63  * If only the 7 Bit is set, it is a 4MiB window.  Otherwise, a
64  * 64KiB window.
67  * The 15 bits controlling the window size are distributed as follows:
71  * If all bits are enabled, we have a 16? MiB window
76 MODULE_PARM_DESC(win_size_bits, "ROM window size bits override, normally set by BIOS.");
82 static void ck804xrom_cleanup(struct ck804xrom_window *window)
87 	if (window->pdev) {
88 		/* Disable writes through the rom window */
89 		pci_read_config_byte(window->pdev, 0x6d, &byte);
90 		pci_write_config_byte(window->pdev, 0x6d, byte & ~1);
94 	list_for_each_entry_safe(map, scratch, &window->maps, list) {
103 	if (window->rsrc.parent)
104 		release_resource(&window->rsrc);
106 	if (window->virt) {
107 		iounmap(window->virt);
108 		window->virt = NULL;
109 		window->phys = 0;
110 		window->size = 0;
112 	pci_dev_put(window->pdev);
122 	struct ck804xrom_window *window = &ck804xrom_window;
126 	/* Remember the pci dev I find the window in */
127 	window->pdev = pci_dev_get(pdev);
131 		/* Enable the selected rom window.  This is often incorrectly
133 		 * requires the full 5MiB of window space.
141 		/* Assume the rom window is properly setup, and find it's size */
145 			window->phys = 0xffb00000; /* 5MiB */
147 			window->phys = 0xffc00000; /* 4MiB */
149 			window->phys = 0xffff0000; /* 64KiB */
162 		window->phys = 0xff000000; /* 16MiB, hardcoded for now */
166 	window->size = 0xffffffffUL - window->phys + 1UL;
169 	 * Try to reserve the window mem region.  If this fails then
170 	 * it is likely due to a fragment of the window being
175 	window->rsrc.name = MOD_NAME;
176 	window->rsrc.start = window->phys;
177 	window->rsrc.end   = window->phys + window->size - 1;
178 	window->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
179 	if (request_resource(&iomem_resource, &window->rsrc)) {
180 		window->rsrc.parent = NULL;
183 			__func__, &window->rsrc);
187 	/* Enable writes through the rom window */
194 	window->virt = ioremap(window->phys, window->size);
195 	if (!window->virt) {
197 			window->phys, window->size);
202 	map_top = window->phys;
213 	 * bytes from the starting address of the window.
229 		offset = map_top - window->phys;
231 			(((unsigned long)(window->virt)) + offset);
263 				" rom(%llu) larger than window(%lu). fixing...\n",
267 		if (window->rsrc.parent) {
277 			if (request_resource(&window->rsrc, &map->rsrc)) {
285 		map->map.virt = window->virt;
286 		map->map.phys = window->phys;
304 		list_add(&map->list, &window->maps);
313 	if (list_empty(&window->maps)) {
314 		ck804xrom_cleanup(window);
323 	struct ck804xrom_window *window = &ck804xrom_window;
325 	ck804xrom_cleanup(window);