Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Flash memory access on SA11x0 based devices | |
69f34c98 | 3 | * |
2f82af08 | 4 | * (C) 2000 Nicolas Pitre <nico@fluxnic.net> |
1da177e4 | 5 | */ |
1da177e4 LT |
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> | |
d052d1be | 13 | #include <linux/platform_device.h> |
1da177e4 | 14 | #include <linux/err.h> |
99730225 | 15 | #include <linux/io.h> |
1da177e4 LT |
16 | |
17 | #include <linux/mtd/mtd.h> | |
18 | #include <linux/mtd/map.h> | |
19 | #include <linux/mtd/partitions.h> | |
20 | #include <linux/mtd/concat.h> | |
21 | ||
a09e64fb | 22 | #include <mach/hardware.h> |
1da177e4 LT |
23 | #include <asm/sizes.h> |
24 | #include <asm/mach/flash.h> | |
25 | ||
1da177e4 LT |
26 | struct sa_subdev_info { |
27 | char name[16]; | |
28 | struct map_info map; | |
29 | struct mtd_info *mtd; | |
57725f0a | 30 | struct flash_platform_data *plat; |
1da177e4 LT |
31 | }; |
32 | ||
33 | struct sa_info { | |
1da177e4 LT |
34 | struct mtd_info *mtd; |
35 | int num_subdev; | |
36 | struct sa_subdev_info subdev[0]; | |
37 | }; | |
38 | ||
ee478af8 PP |
39 | static DEFINE_SPINLOCK(sa1100_vpp_lock); |
40 | static int sa1100_vpp_refcnt; | |
1da177e4 LT |
41 | static void sa1100_set_vpp(struct map_info *map, int on) |
42 | { | |
43 | struct sa_subdev_info *subdev = container_of(map, struct sa_subdev_info, map); | |
ee478af8 PP |
44 | unsigned long flags; |
45 | ||
46 | spin_lock_irqsave(&sa1100_vpp_lock, flags); | |
47 | if (on) { | |
48 | if (++sa1100_vpp_refcnt == 1) /* first nested 'on' */ | |
49 | subdev->plat->set_vpp(1); | |
50 | } else { | |
51 | if (--sa1100_vpp_refcnt == 0) /* last nested 'off' */ | |
52 | subdev->plat->set_vpp(0); | |
53 | } | |
54 | spin_unlock_irqrestore(&sa1100_vpp_lock, flags); | |
1da177e4 LT |
55 | } |
56 | ||
57 | static void sa1100_destroy_subdev(struct sa_subdev_info *subdev) | |
58 | { | |
59 | if (subdev->mtd) | |
60 | map_destroy(subdev->mtd); | |
61 | if (subdev->map.virt) | |
62 | iounmap(subdev->map.virt); | |
63 | release_mem_region(subdev->map.phys, subdev->map.size); | |
64 | } | |
65 | ||
66 | static int sa1100_probe_subdev(struct sa_subdev_info *subdev, struct resource *res) | |
67 | { | |
68 | unsigned long phys; | |
69 | unsigned int size; | |
70 | int ret; | |
71 | ||
72 | phys = res->start; | |
73 | size = res->end - phys + 1; | |
74 | ||
75 | /* | |
76 | * Retrieve the bankwidth from the MSC registers. | |
77 | * We currently only implement CS0 and CS1 here. | |
78 | */ | |
79 | switch (phys) { | |
80 | default: | |
81 | printk(KERN_WARNING "SA1100 flash: unknown base address " | |
82 | "0x%08lx, assuming CS0\n", phys); | |
83 | ||
84 | case SA1100_CS0_PHYS: | |
85 | subdev->map.bankwidth = (MSC0 & MSC_RBW) ? 2 : 4; | |
86 | break; | |
87 | ||
88 | case SA1100_CS1_PHYS: | |
89 | subdev->map.bankwidth = ((MSC0 >> 16) & MSC_RBW) ? 2 : 4; | |
90 | break; | |
91 | } | |
92 | ||
93 | if (!request_mem_region(phys, size, subdev->name)) { | |
94 | ret = -EBUSY; | |
95 | goto out; | |
96 | } | |
97 | ||
57725f0a | 98 | if (subdev->plat->set_vpp) |
1da177e4 LT |
99 | subdev->map.set_vpp = sa1100_set_vpp; |
100 | ||
101 | subdev->map.phys = phys; | |
102 | subdev->map.size = size; | |
103 | subdev->map.virt = ioremap(phys, size); | |
104 | if (!subdev->map.virt) { | |
105 | ret = -ENOMEM; | |
106 | goto err; | |
107 | } | |
108 | ||
109 | simple_map_init(&subdev->map); | |
110 | ||
111 | /* | |
112 | * Now let's probe for the actual flash. Do it here since | |
113 | * specific machine settings might have been set above. | |
114 | */ | |
57725f0a | 115 | subdev->mtd = do_map_probe(subdev->plat->map_name, &subdev->map); |
1da177e4 LT |
116 | if (subdev->mtd == NULL) { |
117 | ret = -ENXIO; | |
118 | goto err; | |
119 | } | |
120 | subdev->mtd->owner = THIS_MODULE; | |
121 | ||
794d579a RK |
122 | printk(KERN_INFO "SA1100 flash: CFI device at 0x%08lx, %uMiB, %d-bit\n", |
123 | phys, (unsigned)(subdev->mtd->size >> 20), | |
1da177e4 LT |
124 | subdev->map.bankwidth * 8); |
125 | ||
126 | return 0; | |
127 | ||
128 | err: | |
129 | sa1100_destroy_subdev(subdev); | |
130 | out: | |
131 | return ret; | |
132 | } | |
133 | ||
0d2ef7d7 | 134 | static void sa1100_destroy(struct sa_info *info, struct flash_platform_data *plat) |
1da177e4 LT |
135 | { |
136 | int i; | |
137 | ||
138 | if (info->mtd) { | |
2fe2e24e | 139 | mtd_device_unregister(info->mtd); |
1da177e4 LT |
140 | if (info->mtd != info->subdev[0].mtd) |
141 | mtd_concat_destroy(info->mtd); | |
1da177e4 LT |
142 | } |
143 | ||
1da177e4 LT |
144 | for (i = info->num_subdev - 1; i >= 0; i--) |
145 | sa1100_destroy_subdev(&info->subdev[i]); | |
146 | kfree(info); | |
0d2ef7d7 RK |
147 | |
148 | if (plat->exit) | |
149 | plat->exit(); | |
1da177e4 LT |
150 | } |
151 | ||
7bf350b7 AB |
152 | static struct sa_info *sa1100_setup_mtd(struct platform_device *pdev, |
153 | struct flash_platform_data *plat) | |
1da177e4 LT |
154 | { |
155 | struct sa_info *info; | |
156 | int nr, size, i, ret = 0; | |
157 | ||
158 | /* | |
159 | * Count number of devices. | |
160 | */ | |
161 | for (nr = 0; ; nr++) | |
162 | if (!platform_get_resource(pdev, IORESOURCE_MEM, nr)) | |
163 | break; | |
164 | ||
165 | if (nr == 0) { | |
166 | ret = -ENODEV; | |
167 | goto out; | |
168 | } | |
169 | ||
170 | size = sizeof(struct sa_info) + sizeof(struct sa_subdev_info) * nr; | |
171 | ||
172 | /* | |
173 | * Allocate the map_info structs in one go. | |
174 | */ | |
95b93a0c | 175 | info = kzalloc(size, GFP_KERNEL); |
1da177e4 LT |
176 | if (!info) { |
177 | ret = -ENOMEM; | |
178 | goto out; | |
179 | } | |
180 | ||
0d2ef7d7 RK |
181 | if (plat->init) { |
182 | ret = plat->init(); | |
183 | if (ret) | |
184 | goto err; | |
185 | } | |
186 | ||
1da177e4 LT |
187 | /* |
188 | * Claim and then map the memory regions. | |
189 | */ | |
190 | for (i = 0; i < nr; i++) { | |
191 | struct sa_subdev_info *subdev = &info->subdev[i]; | |
192 | struct resource *res; | |
193 | ||
194 | res = platform_get_resource(pdev, IORESOURCE_MEM, i); | |
195 | if (!res) | |
196 | break; | |
197 | ||
198 | subdev->map.name = subdev->name; | |
14e66f76 | 199 | sprintf(subdev->name, "%s-%d", plat->name, i); |
57725f0a | 200 | subdev->plat = plat; |
1da177e4 LT |
201 | |
202 | ret = sa1100_probe_subdev(subdev, res); | |
203 | if (ret) | |
204 | break; | |
205 | } | |
206 | ||
207 | info->num_subdev = i; | |
208 | ||
209 | /* | |
210 | * ENXIO is special. It means we didn't find a chip when we probed. | |
211 | */ | |
212 | if (ret != 0 && !(ret == -ENXIO && info->num_subdev > 0)) | |
213 | goto err; | |
214 | ||
215 | /* | |
216 | * If we found one device, don't bother with concat support. If | |
217 | * we found multiple devices, use concat if we have it available, | |
218 | * otherwise fail. Either way, it'll be called "sa1100". | |
219 | */ | |
220 | if (info->num_subdev == 1) { | |
14e66f76 | 221 | strcpy(info->subdev[0].name, plat->name); |
1da177e4 LT |
222 | info->mtd = info->subdev[0].mtd; |
223 | ret = 0; | |
224 | } else if (info->num_subdev > 1) { | |
1da177e4 LT |
225 | struct mtd_info *cdev[nr]; |
226 | /* | |
227 | * We detected multiple devices. Concatenate them together. | |
228 | */ | |
229 | for (i = 0; i < info->num_subdev; i++) | |
230 | cdev[i] = info->subdev[i].mtd; | |
231 | ||
232 | info->mtd = mtd_concat_create(cdev, info->num_subdev, | |
14e66f76 | 233 | plat->name); |
1da177e4 LT |
234 | if (info->mtd == NULL) |
235 | ret = -ENXIO; | |
1da177e4 LT |
236 | } |
237 | ||
238 | if (ret == 0) | |
239 | return info; | |
240 | ||
241 | err: | |
0d2ef7d7 | 242 | sa1100_destroy(info, plat); |
1da177e4 LT |
243 | out: |
244 | return ERR_PTR(ret); | |
245 | } | |
246 | ||
0984c891 | 247 | static const char * const part_probes[] = { "cmdlinepart", "RedBoot", NULL }; |
1da177e4 | 248 | |
06f25510 | 249 | static int sa1100_mtd_probe(struct platform_device *pdev) |
1da177e4 | 250 | { |
d20d5a57 | 251 | struct flash_platform_data *plat = dev_get_platdata(&pdev->dev); |
1da177e4 | 252 | struct sa_info *info; |
769dc431 | 253 | int err; |
1da177e4 | 254 | |
57725f0a | 255 | if (!plat) |
1da177e4 LT |
256 | return -ENODEV; |
257 | ||
57725f0a | 258 | info = sa1100_setup_mtd(pdev, plat); |
1da177e4 LT |
259 | if (IS_ERR(info)) { |
260 | err = PTR_ERR(info); | |
261 | goto out; | |
262 | } | |
263 | ||
264 | /* | |
265 | * Partition selection stuff. | |
266 | */ | |
42d7fbe2 AB |
267 | mtd_device_parse_register(info->mtd, part_probes, NULL, plat->parts, |
268 | plat->nr_parts); | |
822e5e72 | 269 | |
3ae5eaec | 270 | platform_set_drvdata(pdev, info); |
1da177e4 LT |
271 | err = 0; |
272 | ||
273 | out: | |
274 | return err; | |
275 | } | |
276 | ||
3ae5eaec | 277 | static int __exit sa1100_mtd_remove(struct platform_device *pdev) |
1da177e4 | 278 | { |
3ae5eaec | 279 | struct sa_info *info = platform_get_drvdata(pdev); |
d20d5a57 | 280 | struct flash_platform_data *plat = dev_get_platdata(&pdev->dev); |
0d2ef7d7 | 281 | |
0d2ef7d7 RK |
282 | sa1100_destroy(info, plat); |
283 | ||
1da177e4 LT |
284 | return 0; |
285 | } | |
286 | ||
3ae5eaec | 287 | static struct platform_driver sa1100_mtd_driver = { |
1da177e4 LT |
288 | .probe = sa1100_mtd_probe, |
289 | .remove = __exit_p(sa1100_mtd_remove), | |
3ae5eaec | 290 | .driver = { |
bcc8f3e0 | 291 | .name = "sa1100-mtd", |
41d867c9 | 292 | .owner = THIS_MODULE, |
3ae5eaec | 293 | }, |
1da177e4 LT |
294 | }; |
295 | ||
f99640de | 296 | module_platform_driver(sa1100_mtd_driver); |
1da177e4 LT |
297 | |
298 | MODULE_AUTHOR("Nicolas Pitre"); | |
299 | MODULE_DESCRIPTION("SA1100 CFI map driver"); | |
300 | MODULE_LICENSE("GPL"); | |
bcc8f3e0 | 301 | MODULE_ALIAS("platform:sa1100-mtd"); |