2 * Flash memory access on SA11x0 based devices
4 * (C) 2000 Nicolas Pitre <nico@fluxnic.net>
6 #include <linux/module.h>
7 #include <linux/types.h>
8 #include <linux/ioport.h>
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/errno.h>
12 #include <linux/slab.h>
13 #include <linux/platform_device.h>
14 #include <linux/err.h>
17 #include <linux/mtd/mtd.h>
18 #include <linux/mtd/map.h>
19 #include <linux/mtd/partitions.h>
20 #include <linux/mtd/concat.h>
22 #include <mach/hardware.h>
23 #include <asm/sizes.h>
24 #include <asm/mach/flash.h>
26 struct sa_subdev_info {
30 struct flash_platform_data *plat;
36 struct sa_subdev_info subdev[0];
39 static void sa1100_set_vpp(struct map_info *map, int on)
41 struct sa_subdev_info *subdev = container_of(map, struct sa_subdev_info, map);
42 subdev->plat->set_vpp(on);
45 static void sa1100_destroy_subdev(struct sa_subdev_info *subdev)
48 map_destroy(subdev->mtd);
50 iounmap(subdev->map.virt);
51 release_mem_region(subdev->map.phys, subdev->map.size);
54 static int sa1100_probe_subdev(struct sa_subdev_info *subdev, struct resource *res)
61 size = res->end - phys + 1;
64 * Retrieve the bankwidth from the MSC registers.
65 * We currently only implement CS0 and CS1 here.
69 printk(KERN_WARNING "SA1100 flash: unknown base address "
70 "0x%08lx, assuming CS0\n", phys);
73 subdev->map.bankwidth = (MSC0 & MSC_RBW) ? 2 : 4;
77 subdev->map.bankwidth = ((MSC0 >> 16) & MSC_RBW) ? 2 : 4;
81 if (!request_mem_region(phys, size, subdev->name)) {
86 if (subdev->plat->set_vpp)
87 subdev->map.set_vpp = sa1100_set_vpp;
89 subdev->map.phys = phys;
90 subdev->map.size = size;
91 subdev->map.virt = ioremap(phys, size);
92 if (!subdev->map.virt) {
97 simple_map_init(&subdev->map);
100 * Now let's probe for the actual flash. Do it here since
101 * specific machine settings might have been set above.
103 subdev->mtd = do_map_probe(subdev->plat->map_name, &subdev->map);
104 if (subdev->mtd == NULL) {
108 subdev->mtd->owner = THIS_MODULE;
110 printk(KERN_INFO "SA1100 flash: CFI device at 0x%08lx, %uMiB, %d-bit\n",
111 phys, (unsigned)(subdev->mtd->size >> 20),
112 subdev->map.bankwidth * 8);
117 sa1100_destroy_subdev(subdev);
122 static void sa1100_destroy(struct sa_info *info, struct flash_platform_data *plat)
127 mtd_device_unregister(info->mtd);
128 if (info->mtd != info->subdev[0].mtd)
129 mtd_concat_destroy(info->mtd);
132 for (i = info->num_subdev - 1; i >= 0; i--)
133 sa1100_destroy_subdev(&info->subdev[i]);
140 static struct sa_info *__devinit
141 sa1100_setup_mtd(struct platform_device *pdev, struct flash_platform_data *plat)
143 struct sa_info *info;
144 int nr, size, i, ret = 0;
147 * Count number of devices.
150 if (!platform_get_resource(pdev, IORESOURCE_MEM, nr))
158 size = sizeof(struct sa_info) + sizeof(struct sa_subdev_info) * nr;
161 * Allocate the map_info structs in one go.
163 info = kzalloc(size, GFP_KERNEL);
176 * Claim and then map the memory regions.
178 for (i = 0; i < nr; i++) {
179 struct sa_subdev_info *subdev = &info->subdev[i];
180 struct resource *res;
182 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
186 subdev->map.name = subdev->name;
187 sprintf(subdev->name, "%s-%d", plat->name, i);
190 ret = sa1100_probe_subdev(subdev, res);
195 info->num_subdev = i;
198 * ENXIO is special. It means we didn't find a chip when we probed.
200 if (ret != 0 && !(ret == -ENXIO && info->num_subdev > 0))
204 * If we found one device, don't bother with concat support. If
205 * we found multiple devices, use concat if we have it available,
206 * otherwise fail. Either way, it'll be called "sa1100".
208 if (info->num_subdev == 1) {
209 strcpy(info->subdev[0].name, plat->name);
210 info->mtd = info->subdev[0].mtd;
212 } else if (info->num_subdev > 1) {
213 struct mtd_info *cdev[nr];
215 * We detected multiple devices. Concatenate them together.
217 for (i = 0; i < info->num_subdev; i++)
218 cdev[i] = info->subdev[i].mtd;
220 info->mtd = mtd_concat_create(cdev, info->num_subdev,
222 if (info->mtd == NULL)
230 sa1100_destroy(info, plat);
235 static const char *part_probes[] = { "cmdlinepart", "RedBoot", NULL };
237 static int __devinit sa1100_mtd_probe(struct platform_device *pdev)
239 struct flash_platform_data *plat = pdev->dev.platform_data;
240 struct sa_info *info;
246 info = sa1100_setup_mtd(pdev, plat);
253 * Partition selection stuff.
255 mtd_device_parse_register(info->mtd, part_probes, 0,
256 plat->parts, plat->nr_parts);
258 platform_set_drvdata(pdev, info);
265 static int __exit sa1100_mtd_remove(struct platform_device *pdev)
267 struct sa_info *info = platform_get_drvdata(pdev);
268 struct flash_platform_data *plat = pdev->dev.platform_data;
270 platform_set_drvdata(pdev, NULL);
271 sa1100_destroy(info, plat);
276 static struct platform_driver sa1100_mtd_driver = {
277 .probe = sa1100_mtd_probe,
278 .remove = __exit_p(sa1100_mtd_remove),
280 .name = "sa1100-mtd",
281 .owner = THIS_MODULE,
285 module_platform_driver(sa1100_mtd_driver);
287 MODULE_AUTHOR("Nicolas Pitre");
288 MODULE_DESCRIPTION("SA1100 CFI map driver");
289 MODULE_LICENSE("GPL");
290 MODULE_ALIAS("platform:sa1100-mtd");