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