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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* drivers/mtd/maps/plat-ram.c
3 *
4 * (c) 2004-2005 Simtec Electronics
5 * http://www.simtec.co.uk/products/SWLINUX/
6 * Ben Dooks <ben@simtec.co.uk>
7 *
8 * Generic platform device based RAM map
9*/
10
11#include <linux/module.h>
12#include <linux/types.h>
13#include <linux/kernel.h>
14#include <linux/string.h>
15#include <linux/ioport.h>
16#include <linux/device.h>
17#include <linux/slab.h>
18#include <linux/platform_device.h>
19
20#include <linux/mtd/mtd.h>
21#include <linux/mtd/map.h>
22#include <linux/mtd/partitions.h>
23#include <linux/mtd/plat-ram.h>
24
25#include <asm/io.h>
26
27/* private structure for each mtd platform ram device created */
28
29struct platram_info {
30 struct device *dev;
31 struct mtd_info *mtd;
32 struct map_info map;
33 struct platdata_mtd_ram *pdata;
34};
35
36/* to_platram_info()
37 *
38 * device private data to struct platram_info conversion
39*/
40
41static inline struct platram_info *to_platram_info(struct platform_device *dev)
42{
43 return platform_get_drvdata(dev);
44}
45
46/* platram_setrw
47 *
48 * call the platform device's set rw/ro control
49 *
50 * to = 0 => read-only
51 * = 1 => read-write
52*/
53
54static inline void platram_setrw(struct platram_info *info, int to)
55{
56 if (info->pdata == NULL)
57 return;
58
59 if (info->pdata->set_rw != NULL)
60 (info->pdata->set_rw)(info->dev, to);
61}
62
63/* platram_remove
64 *
65 * called to remove the device from the driver's control
66*/
67
68static void platram_remove(struct platform_device *pdev)
69{
70 struct platram_info *info = to_platram_info(pdev);
71
72 dev_dbg(&pdev->dev, "removing device\n");
73
74 if (info == NULL)
75 return;
76
77 if (info->mtd) {
78 mtd_device_unregister(info->mtd);
79 map_destroy(info->mtd);
80 }
81
82 /* ensure ram is left read-only */
83
84 platram_setrw(info, PLATRAM_RO);
85
86 kfree(info);
87}
88
89/* platram_probe
90 *
91 * called from device drive system when a device matching our
92 * driver is found.
93*/
94
95static int platram_probe(struct platform_device *pdev)
96{
97 struct platdata_mtd_ram *pdata;
98 struct platram_info *info;
99 struct resource *res;
100 int err = 0;
101
102 dev_dbg(&pdev->dev, "probe entered\n");
103
104 if (dev_get_platdata(&pdev->dev) == NULL) {
105 dev_err(&pdev->dev, "no platform data supplied\n");
106 err = -ENOENT;
107 goto exit_error;
108 }
109
110 pdata = dev_get_platdata(&pdev->dev);
111
112 info = kzalloc(sizeof(*info), GFP_KERNEL);
113 if (info == NULL) {
114 err = -ENOMEM;
115 goto exit_error;
116 }
117
118 platform_set_drvdata(pdev, info);
119
120 info->dev = &pdev->dev;
121 info->pdata = pdata;
122
123 /* get the resource for the memory mapping */
124 info->map.virt = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
125 if (IS_ERR(info->map.virt)) {
126 err = PTR_ERR(info->map.virt);
127 goto exit_free;
128 }
129
130 dev_dbg(&pdev->dev, "got platform resource %p (0x%llx)\n", res,
131 (unsigned long long)res->start);
132
133 /* setup map parameters */
134
135 info->map.phys = res->start;
136 info->map.size = resource_size(res);
137 info->map.name = pdata->mapname != NULL ?
138 (char *)pdata->mapname : (char *)pdev->name;
139 info->map.bankwidth = pdata->bankwidth;
140
141 dev_dbg(&pdev->dev, "virt %p, %lu bytes\n", info->map.virt, info->map.size);
142
143 simple_map_init(&info->map);
144
145 dev_dbg(&pdev->dev, "initialised map, probing for mtd\n");
146
147 /* probe for the right mtd map driver
148 * supplied by the platform_data struct */
149
150 if (pdata->map_probes) {
151 const char * const *map_probes = pdata->map_probes;
152
153 for ( ; !info->mtd && *map_probes; map_probes++)
154 info->mtd = do_map_probe(*map_probes , &info->map);
155 }
156 /* fallback to map_ram */
157 else
158 info->mtd = do_map_probe("map_ram", &info->map);
159
160 if (info->mtd == NULL) {
161 dev_err(&pdev->dev, "failed to probe for map_ram\n");
162 err = -ENOMEM;
163 goto exit_free;
164 }
165
166 info->mtd->dev.parent = &pdev->dev;
167
168 platram_setrw(info, PLATRAM_RW);
169
170 /* check to see if there are any available partitions, or whether
171 * to add this device whole */
172
173 err = mtd_device_parse_register(info->mtd, pdata->probes, NULL,
174 pdata->partitions,
175 pdata->nr_partitions);
176 if (err) {
177 dev_err(&pdev->dev, "failed to register mtd device\n");
178 goto exit_free;
179 }
180
181 dev_info(&pdev->dev, "registered mtd device\n");
182
183 if (pdata->nr_partitions) {
184 /* add the whole device. */
185 err = mtd_device_register(info->mtd, NULL, 0);
186 if (err) {
187 dev_err(&pdev->dev,
188 "failed to register the entire device\n");
189 goto exit_free;
190 }
191 }
192
193 return 0;
194
195 exit_free:
196 platram_remove(pdev);
197 exit_error:
198 return err;
199}
200
201/* device driver info */
202
203/* work with hotplug and coldplug */
204MODULE_ALIAS("platform:mtd-ram");
205
206static struct platform_driver platram_driver = {
207 .probe = platram_probe,
208 .remove_new = platram_remove,
209 .driver = {
210 .name = "mtd-ram",
211 },
212};
213
214module_platform_driver(platram_driver);
215
216MODULE_LICENSE("GPL");
217MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
218MODULE_DESCRIPTION("MTD platform RAM map driver");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* drivers/mtd/maps/plat-ram.c
3 *
4 * (c) 2004-2005 Simtec Electronics
5 * http://www.simtec.co.uk/products/SWLINUX/
6 * Ben Dooks <ben@simtec.co.uk>
7 *
8 * Generic platform device based RAM map
9*/
10
11#include <linux/module.h>
12#include <linux/types.h>
13#include <linux/kernel.h>
14#include <linux/string.h>
15#include <linux/ioport.h>
16#include <linux/device.h>
17#include <linux/slab.h>
18#include <linux/platform_device.h>
19
20#include <linux/mtd/mtd.h>
21#include <linux/mtd/map.h>
22#include <linux/mtd/partitions.h>
23#include <linux/mtd/plat-ram.h>
24
25#include <asm/io.h>
26
27/* private structure for each mtd platform ram device created */
28
29struct platram_info {
30 struct device *dev;
31 struct mtd_info *mtd;
32 struct map_info map;
33 struct platdata_mtd_ram *pdata;
34};
35
36/* to_platram_info()
37 *
38 * device private data to struct platram_info conversion
39*/
40
41static inline struct platram_info *to_platram_info(struct platform_device *dev)
42{
43 return platform_get_drvdata(dev);
44}
45
46/* platram_setrw
47 *
48 * call the platform device's set rw/ro control
49 *
50 * to = 0 => read-only
51 * = 1 => read-write
52*/
53
54static inline void platram_setrw(struct platram_info *info, int to)
55{
56 if (info->pdata == NULL)
57 return;
58
59 if (info->pdata->set_rw != NULL)
60 (info->pdata->set_rw)(info->dev, to);
61}
62
63/* platram_remove
64 *
65 * called to remove the device from the driver's control
66*/
67
68static int platram_remove(struct platform_device *pdev)
69{
70 struct platram_info *info = to_platram_info(pdev);
71
72 dev_dbg(&pdev->dev, "removing device\n");
73
74 if (info == NULL)
75 return 0;
76
77 if (info->mtd) {
78 mtd_device_unregister(info->mtd);
79 map_destroy(info->mtd);
80 }
81
82 /* ensure ram is left read-only */
83
84 platram_setrw(info, PLATRAM_RO);
85
86 kfree(info);
87
88 return 0;
89}
90
91/* platram_probe
92 *
93 * called from device drive system when a device matching our
94 * driver is found.
95*/
96
97static int platram_probe(struct platform_device *pdev)
98{
99 struct platdata_mtd_ram *pdata;
100 struct platram_info *info;
101 struct resource *res;
102 int err = 0;
103
104 dev_dbg(&pdev->dev, "probe entered\n");
105
106 if (dev_get_platdata(&pdev->dev) == NULL) {
107 dev_err(&pdev->dev, "no platform data supplied\n");
108 err = -ENOENT;
109 goto exit_error;
110 }
111
112 pdata = dev_get_platdata(&pdev->dev);
113
114 info = kzalloc(sizeof(*info), GFP_KERNEL);
115 if (info == NULL) {
116 err = -ENOMEM;
117 goto exit_error;
118 }
119
120 platform_set_drvdata(pdev, info);
121
122 info->dev = &pdev->dev;
123 info->pdata = pdata;
124
125 /* get the resource for the memory mapping */
126 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
127 info->map.virt = devm_ioremap_resource(&pdev->dev, res);
128 if (IS_ERR(info->map.virt)) {
129 err = PTR_ERR(info->map.virt);
130 dev_err(&pdev->dev, "failed to ioremap() region\n");
131 goto exit_free;
132 }
133
134 dev_dbg(&pdev->dev, "got platform resource %p (0x%llx)\n", res,
135 (unsigned long long)res->start);
136
137 /* setup map parameters */
138
139 info->map.phys = res->start;
140 info->map.size = resource_size(res);
141 info->map.name = pdata->mapname != NULL ?
142 (char *)pdata->mapname : (char *)pdev->name;
143 info->map.bankwidth = pdata->bankwidth;
144
145 dev_dbg(&pdev->dev, "virt %p, %lu bytes\n", info->map.virt, info->map.size);
146
147 simple_map_init(&info->map);
148
149 dev_dbg(&pdev->dev, "initialised map, probing for mtd\n");
150
151 /* probe for the right mtd map driver
152 * supplied by the platform_data struct */
153
154 if (pdata->map_probes) {
155 const char * const *map_probes = pdata->map_probes;
156
157 for ( ; !info->mtd && *map_probes; map_probes++)
158 info->mtd = do_map_probe(*map_probes , &info->map);
159 }
160 /* fallback to map_ram */
161 else
162 info->mtd = do_map_probe("map_ram", &info->map);
163
164 if (info->mtd == NULL) {
165 dev_err(&pdev->dev, "failed to probe for map_ram\n");
166 err = -ENOMEM;
167 goto exit_free;
168 }
169
170 info->mtd->dev.parent = &pdev->dev;
171
172 platram_setrw(info, PLATRAM_RW);
173
174 /* check to see if there are any available partitions, or whether
175 * to add this device whole */
176
177 err = mtd_device_parse_register(info->mtd, pdata->probes, NULL,
178 pdata->partitions,
179 pdata->nr_partitions);
180 if (!err)
181 dev_info(&pdev->dev, "registered mtd device\n");
182
183 if (pdata->nr_partitions) {
184 /* add the whole device. */
185 err = mtd_device_register(info->mtd, NULL, 0);
186 if (err) {
187 dev_err(&pdev->dev,
188 "failed to register the entire device\n");
189 }
190 }
191
192 return err;
193
194 exit_free:
195 platram_remove(pdev);
196 exit_error:
197 return err;
198}
199
200/* device driver info */
201
202/* work with hotplug and coldplug */
203MODULE_ALIAS("platform:mtd-ram");
204
205static struct platform_driver platram_driver = {
206 .probe = platram_probe,
207 .remove = platram_remove,
208 .driver = {
209 .name = "mtd-ram",
210 },
211};
212
213module_platform_driver(platram_driver);
214
215MODULE_LICENSE("GPL");
216MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
217MODULE_DESCRIPTION("MTD platform RAM map driver");