[DRIVER MODEL] Convert platform drivers to use struct platform_driver
[linux-2.6.git] / drivers / mtd / maps / ixp2000.c
1 /*
2  * $Id: ixp2000.c,v 1.9 2005/11/07 11:14:27 gleixner Exp $
3  *
4  * drivers/mtd/maps/ixp2000.c
5  *
6  * Mapping for the Intel XScale IXP2000 based systems
7  *
8  * Copyright (C) 2002 Intel Corp.
9  * Copyright (C) 2003-2004 MontaVista Software, Inc.
10  *
11  * Original Author: Naeem M Afzal <naeem.m.afzal@intel.com>
12  * Maintainer: Deepak Saxena <dsaxena@plexity.net>
13  *
14  * This program is free software; you can redistribute it and/or modify
15  * it under the terms of the GNU General Public License version 2 as
16  * published by the Free Software Foundation.
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
40 struct ixp2000_flash_info {
41         struct          mtd_info *mtd;
42         struct          map_info map;
43         struct          mtd_partition *partitions;
44         struct          resource *res;
45         int             nr_banks;
46 };
47
48 static inline unsigned long flash_bank_setup(struct map_info *map, unsigned long ofs)
49 {
50         unsigned long (*set_bank)(unsigned long) =
51                 (unsigned long(*)(unsigned long))map->map_priv_2;
52
53         return (set_bank ? set_bank(ofs) : ofs);
54 }
55
56 #ifdef __ARMEB__
57 /*
58  * Rev A0 and A1 of IXP2400 silicon have a broken addressing unit which
59  * causes the lower address bits to be XORed with 0x11 on 8 bit accesses
60  * and XORed with 0x10 on 16 bit accesses. See the spec update, erratum 44.
61  */
62 static int erratum44_workaround = 0;
63
64 static inline unsigned long address_fix8_write(unsigned long addr)
65 {
66         if (erratum44_workaround) {
67                 return (addr ^ 3);
68         }
69         return addr;
70 }
71 #else
72
73 #define address_fix8_write(x)   (x)
74 #endif
75
76 static map_word ixp2000_flash_read8(struct map_info *map, unsigned long ofs)
77 {
78         map_word val;
79
80         val.x[0] =  *((u8 *)(map->map_priv_1 + flash_bank_setup(map, ofs)));
81         return val;
82 }
83
84 /*
85  * We can't use the standard memcpy due to the broken SlowPort
86  * address translation on rev A0 and A1 silicon and the fact that
87  * we have banked flash.
88  */
89 static void ixp2000_flash_copy_from(struct map_info *map, void *to,
90                               unsigned long from, ssize_t len)
91 {
92         from = flash_bank_setup(map, from);
93         while(len--)
94                 *(__u8 *) to++ = *(__u8 *)(map->map_priv_1 + from++);
95 }
96
97 static void ixp2000_flash_write8(struct map_info *map, map_word d, unsigned long ofs)
98 {
99         *(__u8 *) (address_fix8_write(map->map_priv_1 +
100                                       flash_bank_setup(map, ofs))) = d.x[0];
101 }
102
103 static void ixp2000_flash_copy_to(struct map_info *map, unsigned long to,
104                             const void *from, ssize_t len)
105 {
106         to = flash_bank_setup(map, to);
107         while(len--) {
108                 unsigned long tmp = address_fix8_write(map->map_priv_1 + to++);
109                 *(__u8 *)(tmp) = *(__u8 *)(from++);
110         }
111 }
112
113
114 static int ixp2000_flash_remove(struct platform_device *dev)
115 {
116         struct flash_platform_data *plat = dev->dev.platform_data;
117         struct ixp2000_flash_info *info = platform_get_drvdata(dev);
118
119         platform_set_drvdata(dev, NULL);
120
121         if(!info)
122                 return 0;
123
124         if (info->mtd) {
125                 del_mtd_partitions(info->mtd);
126                 map_destroy(info->mtd);
127         }
128         if (info->map.map_priv_1)
129                 iounmap((void *) info->map.map_priv_1);
130
131         kfree(info->partitions);
132
133         if (info->res) {
134                 release_resource(info->res);
135                 kfree(info->res);
136         }
137
138         if (plat->exit)
139                 plat->exit();
140
141         return 0;
142 }
143
144
145 static int ixp2000_flash_probe(struct platform_device *dev)
146 {
147         static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
148         struct ixp2000_flash_data *ixp_data = dev->dev.platform_data;
149         struct flash_platform_data *plat;
150         struct ixp2000_flash_info *info;
151         unsigned long window_size;
152         int err = -1;
153
154         if (!ixp_data)
155                 return -ENODEV;
156
157         plat = ixp_data->platform_data;
158         if (!plat)
159                 return -ENODEV;
160
161         window_size = dev->resource->end - dev->resource->start + 1;
162         dev_info(_dev, "Probe of IXP2000 flash(%d banks x %dMiB)\n",
163                         ixp_data->nr_banks, ((u32)window_size >> 20));
164
165         if (plat->width != 1) {
166                 dev_err(_dev, "IXP2000 MTD map only supports 8-bit mode, asking for %d\n",
167                                 plat->width * 8);
168                 return -EIO;
169         }
170
171         info = kmalloc(sizeof(struct ixp2000_flash_info), GFP_KERNEL);
172         if(!info) {
173                 err = -ENOMEM;
174                 goto Error;
175         }
176         memzero(info, sizeof(struct ixp2000_flash_info));
177
178         platform_set_drvdata(dev, info);
179
180         /*
181          * Tell the MTD layer we're not 1:1 mapped so that it does
182          * not attempt to do a direct access on us.
183          */
184         info->map.phys = NO_XIP;
185
186         info->nr_banks = ixp_data->nr_banks;
187         info->map.size = ixp_data->nr_banks * window_size;
188         info->map.bankwidth = 1;
189
190         /*
191          * map_priv_2 is used to store a ptr to to the bank_setup routine
192          */
193         info->map.map_priv_2 = (unsigned long) ixp_data->bank_setup;
194
195         info->map.name = dev->dev.bus_id;
196         info->map.read = ixp2000_flash_read8;
197         info->map.write = ixp2000_flash_write8;
198         info->map.copy_from = ixp2000_flash_copy_from;
199         info->map.copy_to = ixp2000_flash_copy_to;
200
201         info->res = request_mem_region(dev->resource->start,
202                         dev->resource->end - dev->resource->start + 1,
203                         dev->dev.bus_id);
204         if (!info->res) {
205                 dev_err(_dev, "Could not reserve memory region\n");
206                 err = -ENOMEM;
207                 goto Error;
208         }
209
210         info->map.map_priv_1 = (unsigned long) ioremap(dev->resource->start,
211                                 dev->resource->end - dev->resource->start + 1);
212         if (!info->map.map_priv_1) {
213                 dev_err(_dev, "Failed to ioremap flash region\n");
214                 err = -EIO;
215                 goto Error;
216         }
217
218 #if defined(__ARMEB__)
219         /*
220          * Enable erratum 44 workaround for NPUs with broken slowport
221          */
222
223         erratum44_workaround = ixp2000_has_broken_slowport();
224         dev_info(_dev, "Erratum 44 workaround %s\n",
225                erratum44_workaround ? "enabled" : "disabled");
226 #endif
227
228         info->mtd = do_map_probe(plat->map_name, &info->map);
229         if (!info->mtd) {
230                 dev_err(_dev, "map_probe failed\n");
231                 err = -ENXIO;
232                 goto Error;
233         }
234         info->mtd->owner = THIS_MODULE;
235
236         err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
237         if (err > 0) {
238                 err = add_mtd_partitions(info->mtd, info->partitions, err);
239                 if(err)
240                         dev_err(_dev, "Could not parse partitions\n");
241         }
242
243         if (err)
244                 goto Error;
245
246         return 0;
247
248 Error:
249         ixp2000_flash_remove(dev);
250         return err;
251 }
252
253 static struct platform_driver ixp2000_flash_driver = {
254         .probe          = &ixp2000_flash_probe,
255         .remove         = &ixp2000_flash_remove
256         .driver         = {
257                 .name   = "IXP2000-Flash",
258         },
259 };
260
261 static int __init ixp2000_flash_init(void)
262 {
263         return platform_driver_register(&ixp2000_flash_driver);
264 }
265
266 static void __exit ixp2000_flash_exit(void)
267 {
268         platform_driver_unregister(&ixp2000_flash_driver);
269 }
270
271 module_init(ixp2000_flash_init);
272 module_exit(ixp2000_flash_exit);
273 MODULE_LICENSE("GPL");
274 MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>");
275