1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20#include <linux/module.h>
21#include <linux/types.h>
22#include <linux/init.h>
23#include <linux/kernel.h>
24#include <linux/string.h>
25#include <linux/slab.h>
26#include <linux/ioport.h>
27#include <linux/device.h>
28#include <linux/platform_device.h>
29
30#include <linux/mtd/mtd.h>
31#include <linux/mtd/map.h>
32#include <linux/mtd/partitions.h>
33
34#include <asm/io.h>
35#include <asm/hardware.h>
36#include <asm/mach/flash.h>
37
38#include <linux/reboot.h>
39
40struct ixp2000_flash_info {
41 struct mtd_info *mtd;
42 struct map_info map;
43 struct mtd_partition *partitions;
44 struct resource *res;
45};
46
47static inline unsigned long flash_bank_setup(struct map_info *map, unsigned long ofs)
48{
49 unsigned long (*set_bank)(unsigned long) =
50 (unsigned long(*)(unsigned long))map->map_priv_2;
51
52 return (set_bank ? set_bank(ofs) : ofs);
53}
54
55#ifdef __ARMEB__
56
57
58
59
60
61static int erratum44_workaround = 0;
62
63static inline unsigned long address_fix8_write(unsigned long addr)
64{
65 if (erratum44_workaround) {
66 return (addr ^ 3);
67 }
68 return addr;
69}
70#else
71
72#define address_fix8_write(x) (x)
73#endif
74
75static map_word ixp2000_flash_read8(struct map_info *map, unsigned long ofs)
76{
77 map_word val;
78
79 val.x[0] = *((u8 *)(map->map_priv_1 + flash_bank_setup(map, ofs)));
80 return val;
81}
82
83
84
85
86
87
88static void ixp2000_flash_copy_from(struct map_info *map, void *to,
89 unsigned long from, ssize_t len)
90{
91 from = flash_bank_setup(map, from);
92 while(len--)
93 *(__u8 *) to++ = *(__u8 *)(map->map_priv_1 + from++);
94}
95
96static void ixp2000_flash_write8(struct map_info *map, map_word d, unsigned long ofs)
97{
98 *(__u8 *) (address_fix8_write(map->map_priv_1 +
99 flash_bank_setup(map, ofs))) = d.x[0];
100}
101
102static void ixp2000_flash_copy_to(struct map_info *map, unsigned long to,
103 const void *from, ssize_t len)
104{
105 to = flash_bank_setup(map, to);
106 while(len--) {
107 unsigned long tmp = address_fix8_write(map->map_priv_1 + to++);
108 *(__u8 *)(tmp) = *(__u8 *)(from++);
109 }
110}
111
112
113static int ixp2000_flash_remove(struct platform_device *dev)
114{
115 struct flash_platform_data *plat = dev->dev.platform_data;
116 struct ixp2000_flash_info *info = platform_get_drvdata(dev);
117
118 platform_set_drvdata(dev, NULL);
119
120 if(!info)
121 return 0;
122
123 if (info->mtd) {
124 del_mtd_partitions(info->mtd);
125 map_destroy(info->mtd);
126 }
127 if (info->map.map_priv_1)
128 iounmap((void *) info->map.map_priv_1);
129
130 kfree(info->partitions);
131
132 if (info->res) {
133 release_resource(info->res);
134 kfree(info->res);
135 }
136
137 if (plat->exit)
138 plat->exit();
139
140 return 0;
141}
142
143
144static int ixp2000_flash_probe(struct platform_device *dev)
145{
146 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
147 struct ixp2000_flash_data *ixp_data = dev->dev.platform_data;
148 struct flash_platform_data *plat;
149 struct ixp2000_flash_info *info;
150 unsigned long window_size;
151 int err = -1;
152
153 if (!ixp_data)
154 return -ENODEV;
155
156 plat = ixp_data->platform_data;
157 if (!plat)
158 return -ENODEV;
159
160 window_size = dev->resource->end - dev->resource->start + 1;
161 dev_info(&dev->dev, "Probe of IXP2000 flash(%d banks x %dMiB)\n",
162 ixp_data->nr_banks, ((u32)window_size >> 20));
163
164 if (plat->width != 1) {
165 dev_err(&dev->dev, "IXP2000 MTD map only supports 8-bit mode, asking for %d\n",
166 plat->width * 8);
167 return -EIO;
168 }
169
170 info = kmalloc(sizeof(struct ixp2000_flash_info), GFP_KERNEL);
171 if(!info) {
172 err = -ENOMEM;
173 goto Error;
174 }
175 memzero(info, sizeof(struct ixp2000_flash_info));
176
177 platform_set_drvdata(dev, info);
178
179
180
181
182
183 info->map.phys = NO_XIP;
184
185 info->map.size = ixp_data->nr_banks * window_size;
186 info->map.bankwidth = 1;
187
188
189
190
191 info->map.map_priv_2 = (unsigned long) ixp_data->bank_setup;
192
193 info->map.name = dev->dev.bus_id;
194 info->map.read = ixp2000_flash_read8;
195 info->map.write = ixp2000_flash_write8;
196 info->map.copy_from = ixp2000_flash_copy_from;
197 info->map.copy_to = ixp2000_flash_copy_to;
198
199 info->res = request_mem_region(dev->resource->start,
200 dev->resource->end - dev->resource->start + 1,
201 dev->dev.bus_id);
202 if (!info->res) {
203 dev_err(&dev->dev, "Could not reserve memory region\n");
204 err = -ENOMEM;
205 goto Error;
206 }
207
208 info->map.map_priv_1 = (unsigned long) ioremap(dev->resource->start,
209 dev->resource->end - dev->resource->start + 1);
210 if (!info->map.map_priv_1) {
211 dev_err(&dev->dev, "Failed to ioremap flash region\n");
212 err = -EIO;
213 goto Error;
214 }
215
216#if defined(__ARMEB__)
217
218
219
220
221 erratum44_workaround = ixp2000_has_broken_slowport();
222 dev_info(&dev->dev, "Erratum 44 workaround %s\n",
223 erratum44_workaround ? "enabled" : "disabled");
224#endif
225
226 info->mtd = do_map_probe(plat->map_name, &info->map);
227 if (!info->mtd) {
228 dev_err(&dev->dev, "map_probe failed\n");
229 err = -ENXIO;
230 goto Error;
231 }
232 info->mtd->owner = THIS_MODULE;
233
234 err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
235 if (err > 0) {
236 err = add_mtd_partitions(info->mtd, info->partitions, err);
237 if(err)
238 dev_err(&dev->dev, "Could not parse partitions\n");
239 }
240
241 if (err)
242 goto Error;
243
244 return 0;
245
246Error:
247 ixp2000_flash_remove(dev);
248 return err;
249}
250
251static struct platform_driver ixp2000_flash_driver = {
252 .probe = ixp2000_flash_probe,
253 .remove = ixp2000_flash_remove,
254 .driver = {
255 .name = "IXP2000-Flash",
256 },
257};
258
259static int __init ixp2000_flash_init(void)
260{
261 return platform_driver_register(&ixp2000_flash_driver);
262}
263
264static void __exit ixp2000_flash_exit(void)
265{
266 platform_driver_unregister(&ixp2000_flash_driver);
267}
268
269module_init(ixp2000_flash_init);
270module_exit(ixp2000_flash_exit);
271MODULE_LICENSE("GPL");
272MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>");
273
274
