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 int nr_parts;
31 struct mtd_partition *parts;
32};
33
34static int physmap_flash_remove(struct platform_device *dev)
35{
36 struct physmap_flash_info *info;
37 struct physmap_flash_data *physmap_data;
38 int i;
39
40 info = platform_get_drvdata(dev);
41 if (info == NULL)
42 return 0;
43 platform_set_drvdata(dev, NULL);
44
45 physmap_data = dev->dev.platform_data;
46
47 if (info->cmtd) {
48 mtd_device_unregister(info->cmtd);
49 if (info->nr_parts)
50 kfree(info->parts);
51 if (info->cmtd != info->mtd[0])
52 mtd_concat_destroy(info->cmtd);
53 }
54
55 for (i = 0; i < MAX_RESOURCES; i++) {
56 if (info->mtd[i] != NULL)
57 map_destroy(info->mtd[i]);
58 }
59
60 if (physmap_data->exit)
61 physmap_data->exit(dev);
62
63 return 0;
64}
65
66static void physmap_set_vpp(struct map_info *map, int state)
67{
68 struct platform_device *pdev;
69 struct physmap_flash_data *physmap_data;
70
71 pdev = (struct platform_device *)map->map_priv_1;
72 physmap_data = pdev->dev.platform_data;
73
74 if (physmap_data->set_vpp)
75 physmap_data->set_vpp(pdev, state);
76}
77
78static const char *rom_probe_types[] = {
79 "cfi_probe",
80 "jedec_probe",
81 "qinfo_probe",
82 "map_rom",
83 NULL };
84static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", "afs",
85 NULL };
86
87static int physmap_flash_probe(struct platform_device *dev)
88{
89 struct physmap_flash_data *physmap_data;
90 struct physmap_flash_info *info;
91 const char **probe_type;
92 int err = 0;
93 int i;
94 int devices_found = 0;
95
96 physmap_data = dev->dev.platform_data;
97 if (physmap_data == NULL)
98 return -ENODEV;
99
100 info = devm_kzalloc(&dev->dev, sizeof(struct physmap_flash_info),
101 GFP_KERNEL);
102 if (info == NULL) {
103 err = -ENOMEM;
104 goto err_out;
105 }
106
107 if (physmap_data->init) {
108 err = physmap_data->init(dev);
109 if (err)
110 goto err_out;
111 }
112
113 platform_set_drvdata(dev, info);
114
115 for (i = 0; i < dev->num_resources; i++) {
116 printk(KERN_NOTICE "physmap platform flash device: %.8llx at %.8llx\n",
117 (unsigned long long)resource_size(&dev->resource[i]),
118 (unsigned long long)dev->resource[i].start);
119
120 if (!devm_request_mem_region(&dev->dev,
121 dev->resource[i].start,
122 resource_size(&dev->resource[i]),
123 dev_name(&dev->dev))) {
124 dev_err(&dev->dev, "Could not reserve memory region\n");
125 err = -ENOMEM;
126 goto err_out;
127 }
128
129 info->map[i].name = dev_name(&dev->dev);
130 info->map[i].phys = dev->resource[i].start;
131 info->map[i].size = resource_size(&dev->resource[i]);
132 info->map[i].bankwidth = physmap_data->width;
133 info->map[i].set_vpp = physmap_set_vpp;
134 info->map[i].pfow_base = physmap_data->pfow_base;
135 info->map[i].map_priv_1 = (unsigned long)dev;
136
137 info->map[i].virt = devm_ioremap(&dev->dev, info->map[i].phys,
138 info->map[i].size);
139 if (info->map[i].virt == NULL) {
140 dev_err(&dev->dev, "Failed to ioremap flash region\n");
141 err = -EIO;
142 goto err_out;
143 }
144
145 simple_map_init(&info->map[i]);
146
147 probe_type = rom_probe_types;
148 if (physmap_data->probe_type == NULL) {
149 for (; info->mtd[i] == NULL && *probe_type != NULL; probe_type++)
150 info->mtd[i] = do_map_probe(*probe_type, &info->map[i]);
151 } else
152 info->mtd[i] = do_map_probe(physmap_data->probe_type, &info->map[i]);
153
154 if (info->mtd[i] == NULL) {
155 dev_err(&dev->dev, "map_probe failed\n");
156 err = -ENXIO;
157 goto err_out;
158 } else {
159 devices_found++;
160 }
161 info->mtd[i]->owner = THIS_MODULE;
162 info->mtd[i]->dev.parent = &dev->dev;
163 }
164
165 if (devices_found == 1) {
166 info->cmtd = info->mtd[0];
167 } else if (devices_found > 1) {
168 /*
169 * We detected multiple devices. Concatenate them together.
170 */
171 info->cmtd = mtd_concat_create(info->mtd, devices_found, dev_name(&dev->dev));
172 if (info->cmtd == NULL)
173 err = -ENXIO;
174 }
175 if (err)
176 goto err_out;
177
178 err = parse_mtd_partitions(info->cmtd, part_probe_types,
179 &info->parts, 0);
180 if (err > 0) {
181 mtd_device_register(info->cmtd, info->parts, err);
182 info->nr_parts = err;
183 return 0;
184 }
185
186 if (physmap_data->nr_parts) {
187 printk(KERN_NOTICE "Using physmap partition information\n");
188 mtd_device_register(info->cmtd, physmap_data->parts,
189 physmap_data->nr_parts);
190 return 0;
191 }
192
193 mtd_device_register(info->cmtd, NULL, 0);
194
195 return 0;
196
197err_out:
198 physmap_flash_remove(dev);
199 return err;
200}
201
202#ifdef CONFIG_PM
203static void physmap_flash_shutdown(struct platform_device *dev)
204{
205 struct physmap_flash_info *info = platform_get_drvdata(dev);
206 int i;
207
208 for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
209 if (info->mtd[i]->suspend && info->mtd[i]->resume)
210 if (info->mtd[i]->suspend(info->mtd[i]) == 0)
211 info->mtd[i]->resume(info->mtd[i]);
212}
213#else
214#define physmap_flash_shutdown NULL
215#endif
216
217static struct platform_driver physmap_flash_driver = {
218 .probe = physmap_flash_probe,
219 .remove = physmap_flash_remove,
220 .shutdown = physmap_flash_shutdown,
221 .driver = {
222 .name = "physmap-flash",
223 .owner = THIS_MODULE,
224 },
225};
226
227
228#ifdef CONFIG_MTD_PHYSMAP_COMPAT
229static struct physmap_flash_data physmap_flash_data = {
230 .width = CONFIG_MTD_PHYSMAP_BANKWIDTH,
231};
232
233static struct resource physmap_flash_resource = {
234 .start = CONFIG_MTD_PHYSMAP_START,
235 .end = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
236 .flags = IORESOURCE_MEM,
237};
238
239static struct platform_device physmap_flash = {
240 .name = "physmap-flash",
241 .id = 0,
242 .dev = {
243 .platform_data = &physmap_flash_data,
244 },
245 .num_resources = 1,
246 .resource = &physmap_flash_resource,
247};
248
249void physmap_configure(unsigned long addr, unsigned long size,
250 int bankwidth, void (*set_vpp)(struct map_info *, int))
251{
252 physmap_flash_resource.start = addr;
253 physmap_flash_resource.end = addr + size - 1;
254 physmap_flash_data.width = bankwidth;
255 physmap_flash_data.set_vpp = set_vpp;
256}
257
258void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
259{
260 physmap_flash_data.nr_parts = num_parts;
261 physmap_flash_data.parts = parts;
262}
263#endif
264
265static int __init physmap_init(void)
266{
267 int err;
268
269 err = platform_driver_register(&physmap_flash_driver);
270#ifdef CONFIG_MTD_PHYSMAP_COMPAT
271 if (err == 0) {
272 err = platform_device_register(&physmap_flash);
273 if (err)
274 platform_driver_unregister(&physmap_flash_driver);
275 }
276#endif
277
278 return err;
279}
280
281static void __exit physmap_exit(void)
282{
283#ifdef CONFIG_MTD_PHYSMAP_COMPAT
284 platform_device_unregister(&physmap_flash);
285#endif
286 platform_driver_unregister(&physmap_flash_driver);
287}
288
289module_init(physmap_init);
290module_exit(physmap_exit);
291
292MODULE_LICENSE("GPL");
293MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
294MODULE_DESCRIPTION("Generic configurable MTD map driver");
295
296/* legacy platform drivers can't hotplug or coldplg */
297#ifndef CONFIG_MTD_PHYSMAP_COMPAT
298/* work with hotplug and coldplug */
299MODULE_ALIAS("platform:physmap-flash");
300#endif