Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * Normal mappings of chips in physical memory
3 *
4 * Copyright (C) 2003 MontaVista Software Inc.
5 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
6 *
7 * 031022 - [jsun] add run-time configure and partition setup
8 */
9
10#include <linux/module.h>
11#include <linux/types.h>
12#include <linux/kernel.h>
13#include <linux/init.h>
14#include <linux/slab.h>
15#include <linux/device.h>
16#include <linux/platform_device.h>
17#include <linux/mtd/mtd.h>
18#include <linux/mtd/map.h>
19#include <linux/mtd/partitions.h>
20#include <linux/mtd/physmap.h>
21#include <linux/mtd/concat.h>
22#include <linux/io.h>
23
24#define MAX_RESOURCES 4
25
26struct physmap_flash_info {
27 struct mtd_info *mtd[MAX_RESOURCES];
28 struct mtd_info *cmtd;
29 struct map_info map[MAX_RESOURCES];
30#ifdef CONFIG_MTD_PARTITIONS
31 int nr_parts;
32 struct mtd_partition *parts;
33#endif
34};
35
36static int physmap_flash_remove(struct platform_device *dev)
37{
38 struct physmap_flash_info *info;
39 struct physmap_flash_data *physmap_data;
40 int i;
41
42 info = platform_get_drvdata(dev);
43 if (info == NULL)
44 return 0;
45 platform_set_drvdata(dev, NULL);
46
47 physmap_data = dev->dev.platform_data;
48
49 if (info->cmtd) {
50#ifdef CONFIG_MTD_PARTITIONS
51 if (info->nr_parts || physmap_data->nr_parts) {
52 del_mtd_partitions(info->cmtd);
53
54 if (info->nr_parts)
55 kfree(info->parts);
56 } else {
57 del_mtd_device(info->cmtd);
58 }
59#else
60 del_mtd_device(info->cmtd);
61#endif
62#ifdef CONFIG_MTD_CONCAT
63 if (info->cmtd != info->mtd[0])
64 mtd_concat_destroy(info->cmtd);
65#endif
66 }
67
68 for (i = 0; i < MAX_RESOURCES; i++) {
69 if (info->mtd[i] != NULL)
70 map_destroy(info->mtd[i]);
71 }
72 return 0;
73}
74
75static const char *rom_probe_types[] = {
76 "cfi_probe",
77 "jedec_probe",
78 "qinfo_probe",
79 "map_rom",
80 NULL };
81#ifdef CONFIG_MTD_PARTITIONS
82static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
83#endif
84
85static int physmap_flash_probe(struct platform_device *dev)
86{
87 struct physmap_flash_data *physmap_data;
88 struct physmap_flash_info *info;
89 const char **probe_type;
90 int err = 0;
91 int i;
92 int devices_found = 0;
93
94 physmap_data = dev->dev.platform_data;
95 if (physmap_data == NULL)
96 return -ENODEV;
97
98 info = devm_kzalloc(&dev->dev, sizeof(struct physmap_flash_info),
99 GFP_KERNEL);
100 if (info == NULL) {
101 err = -ENOMEM;
102 goto err_out;
103 }
104
105 platform_set_drvdata(dev, info);
106
107 for (i = 0; i < dev->num_resources; i++) {
108 printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
109 (unsigned long long)(dev->resource[i].end - dev->resource[i].start + 1),
110 (unsigned long long)dev->resource[i].start);
111
112 if (!devm_request_mem_region(&dev->dev,
113 dev->resource[i].start,
114 dev->resource[i].end - dev->resource[i].start + 1,
115 dev_name(&dev->dev))) {
116 dev_err(&dev->dev, "Could not reserve memory region\n");
117 err = -ENOMEM;
118 goto err_out;
119 }
120
121 info->map[i].name = dev_name(&dev->dev);
122 info->map[i].phys = dev->resource[i].start;
123 info->map[i].size = dev->resource[i].end - dev->resource[i].start + 1;
124 info->map[i].bankwidth = physmap_data->width;
125 info->map[i].set_vpp = physmap_data->set_vpp;
126 info->map[i].pfow_base = physmap_data->pfow_base;
127
128 info->map[i].virt = devm_ioremap(&dev->dev, info->map[i].phys,
129 info->map[i].size);
130 if (info->map[i].virt == NULL) {
131 dev_err(&dev->dev, "Failed to ioremap flash region\n");
132 err = -EIO;
133 goto err_out;
134 }
135
136 simple_map_init(&info->map[i]);
137
138 probe_type = rom_probe_types;
139 for (; info->mtd[i] == NULL && *probe_type != NULL; probe_type++)
140 info->mtd[i] = do_map_probe(*probe_type, &info->map[i]);
141 if (info->mtd[i] == NULL) {
142 dev_err(&dev->dev, "map_probe failed\n");
143 err = -ENXIO;
144 goto err_out;
145 } else {
146 devices_found++;
147 }
148 info->mtd[i]->owner = THIS_MODULE;
149 info->mtd[i]->dev.parent = &dev->dev;
150 }
151
152 if (devices_found == 1) {
153 info->cmtd = info->mtd[0];
154 } else if (devices_found > 1) {
155 /*
156 * We detected multiple devices. Concatenate them together.
157 */
158#ifdef CONFIG_MTD_CONCAT
159 info->cmtd = mtd_concat_create(info->mtd, devices_found, dev_name(&dev->dev));
160 if (info->cmtd == NULL)
161 err = -ENXIO;
162#else
163 printk(KERN_ERR "physmap-flash: multiple devices "
164 "found but MTD concat support disabled.\n");
165 err = -ENXIO;
166#endif
167 }
168 if (err)
169 goto err_out;
170
171#ifdef CONFIG_MTD_PARTITIONS
172 err = parse_mtd_partitions(info->cmtd, part_probe_types,
173 &info->parts, 0);
174 if (err > 0) {
175 add_mtd_partitions(info->cmtd, info->parts, err);
176 info->nr_parts = err;
177 return 0;
178 }
179
180 if (physmap_data->nr_parts) {
181 printk(KERN_NOTICE "Using physmap partition information\n");
182 add_mtd_partitions(info->cmtd, physmap_data->parts,
183 physmap_data->nr_parts);
184 return 0;
185 }
186#endif
187
188 add_mtd_device(info->cmtd);
189 return 0;
190
191err_out:
192 physmap_flash_remove(dev);
193 return err;
194}
195
196#ifdef CONFIG_PM
197static void physmap_flash_shutdown(struct platform_device *dev)
198{
199 struct physmap_flash_info *info = platform_get_drvdata(dev);
200 int i;
201
202 for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
203 if (info->mtd[i]->suspend && info->mtd[i]->resume)
204 if (info->mtd[i]->suspend(info->mtd[i]) == 0)
205 info->mtd[i]->resume(info->mtd[i]);
206}
207#else
208#define physmap_flash_shutdown NULL
209#endif
210
211static struct platform_driver physmap_flash_driver = {
212 .probe = physmap_flash_probe,
213 .remove = physmap_flash_remove,
214 .shutdown = physmap_flash_shutdown,
215 .driver = {
216 .name = "physmap-flash",
217 .owner = THIS_MODULE,
218 },
219};
220
221
222#ifdef CONFIG_MTD_PHYSMAP_COMPAT
223static struct physmap_flash_data physmap_flash_data = {
224 .width = CONFIG_MTD_PHYSMAP_BANKWIDTH,
225};
226
227static struct resource physmap_flash_resource = {
228 .start = CONFIG_MTD_PHYSMAP_START,
229 .end = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
230 .flags = IORESOURCE_MEM,
231};
232
233static struct platform_device physmap_flash = {
234 .name = "physmap-flash",
235 .id = 0,
236 .dev = {
237 .platform_data = &physmap_flash_data,
238 },
239 .num_resources = 1,
240 .resource = &physmap_flash_resource,
241};
242
243void physmap_configure(unsigned long addr, unsigned long size,
244 int bankwidth, void (*set_vpp)(struct map_info *, int))
245{
246 physmap_flash_resource.start = addr;
247 physmap_flash_resource.end = addr + size - 1;
248 physmap_flash_data.width = bankwidth;
249 physmap_flash_data.set_vpp = set_vpp;
250}
251
252#ifdef CONFIG_MTD_PARTITIONS
253void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
254{
255 physmap_flash_data.nr_parts = num_parts;
256 physmap_flash_data.parts = parts;
257}
258#endif
259#endif
260
261static int __init physmap_init(void)
262{
263 int err;
264
265 err = platform_driver_register(&physmap_flash_driver);
266#ifdef CONFIG_MTD_PHYSMAP_COMPAT
267 if (err == 0) {
268 err = platform_device_register(&physmap_flash);
269 if (err)
270 platform_driver_unregister(&physmap_flash_driver);
271 }
272#endif
273
274 return err;
275}
276
277static void __exit physmap_exit(void)
278{
279#ifdef CONFIG_MTD_PHYSMAP_COMPAT
280 platform_device_unregister(&physmap_flash);
281#endif
282 platform_driver_unregister(&physmap_flash_driver);
283}
284
285module_init(physmap_init);
286module_exit(physmap_exit);
287
288MODULE_LICENSE("GPL");
289MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
290MODULE_DESCRIPTION("Generic configurable MTD map driver");
291
292/* legacy platform drivers can't hotplug or coldplg */
293#ifndef CONFIG_MTD_PHYSMAP_COMPAT
294/* work with hotplug and coldplug */
295MODULE_ALIAS("platform:physmap-flash");
296#endif