1 /*
2 * drivers/mtd/maps/ixp2000.c
3 *
4 * Mapping for the Intel XScale IXP2000 based systems
5 *
6 * Copyright (C) 2002 Intel Corp.
7 * Copyright (C) 2003-2004 MontaVista Software, Inc.
8 *
9 * Original Author: Naeem M Afzal <naeem.m.afzal@intel.com>
10 * Maintainer: Deepak Saxena <dsaxena@plexity.net>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 *
16 */
17
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
38 struct ixp2000_flash_info {
39 struct mtd_info *mtd;
40 struct map_info map;
41 struct mtd_partition *partitions;
42 struct resource *res;
43 };
44
45 static 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 * Rev A0 and A1 of IXP2400 silicon have a broken addressing unit which
56 * causes the lower address bits to be XORed with 0x11 on 8 bit accesses
57 * and XORed with 0x10 on 16 bit accesses. See the spec update, erratum 44.
58 */
59 static int erratum44_workaround = 0;
60
61 static 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
73 static 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 * We can't use the standard memcpy due to the broken SlowPort
83 * address translation on rev A0 and A1 silicon and the fact that
84 * we have banked flash.
85 */
86 static 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
94 static 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
100 static 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
111 static 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
142 static 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 = kmalloc(sizeof(struct ixp2000_flash_info), GFP_KERNEL);
169 if(!info) {
170 err = -ENOMEM;
171 goto Error;
172 }
173 memset(info, 0, sizeof(struct ixp2000_flash_info));
174
175 platform_set_drvdata(dev, info);
176
177 /*
178 * Tell the MTD layer we're not 1:1 mapped so that it does
179 * not attempt to do a direct access on us.
180 */
181 info->map.phys = NO_XIP;
182
183 info->map.size = ixp_data->nr_banks * window_size;
184 info->map.bankwidth = 1;
185
186 /*
187 * map_priv_2 is used to store a ptr to to the bank_setup routine
188 */
189 info->map.map_priv_2 = (unsigned long) ixp_data->bank_setup;
190
191 info->map.name = dev_name(&dev->dev);
192 info->map.read = ixp2000_flash_read8;
193 info->map.write = ixp2000_flash_write8;
194 info->map.copy_from = ixp2000_flash_copy_from;
195 info->map.copy_to = ixp2000_flash_copy_to;
196
197 info->res = request_mem_region(dev->resource->start,
198 dev->resource->end - dev->resource->start + 1,
199 dev_name(&dev->dev));
200 if (!info->res) {
201 dev_err(&dev->dev, "Could not reserve memory region\n");
202 err = -ENOMEM;
203 goto Error;
204 }
205
206 info->map.map_priv_1 = (unsigned long) ioremap(dev->resource->start,
207 dev->resource->end - dev->resource->start + 1);
208 if (!info->map.map_priv_1) {
209 dev_err(&dev->dev, "Failed to ioremap flash region\n");
210 err = -EIO;
211 goto Error;
212 }
213
214 #if defined(__ARMEB__)
215 /*
216 * Enable erratum 44 workaround for NPUs with broken slowport
217 */
218
219 erratum44_workaround = ixp2000_has_broken_slowport();
220 dev_info(&dev->dev, "Erratum 44 workaround %s\n",
221 erratum44_workaround ? "enabled" : "disabled");
222 #endif
223
224 info->mtd = do_map_probe(plat->map_name, &info->map);
225 if (!info->mtd) {
226 dev_err(&dev->dev, "map_probe failed\n");
227 err = -ENXIO;
228 goto Error;
229 }
230 info->mtd->owner = THIS_MODULE;
231
232 err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
233 if (err > 0) {
234 err = add_mtd_partitions(info->mtd, info->partitions, err);
235 if(err)
236 dev_err(&dev->dev, "Could not parse partitions\n");
237 }
238
239 if (err)
240 goto Error;
241
242 return 0;
243
244 Error:
245 ixp2000_flash_remove(dev);
246 return err;
247 }
248
249 static struct platform_driver ixp2000_flash_driver = {
250 .probe = ixp2000_flash_probe,
251 .remove = ixp2000_flash_remove,
252 .driver = {
253 .name = "IXP2000-Flash",
254 .owner = THIS_MODULE,
255 },
256 };
257
258 static int __init ixp2000_flash_init(void)
259 {
260 return platform_driver_register(&ixp2000_flash_driver);
261 }
262
263 static void __exit ixp2000_flash_exit(void)
264 {
265 platform_driver_unregister(&ixp2000_flash_driver);
266 }
267
268 module_init(ixp2000_flash_init);
269 module_exit(ixp2000_flash_exit);
270 MODULE_LICENSE("GPL");
271 MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>");
272 MODULE_ALIAS("platform:IXP2000-Flash");
273
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