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