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 resource *res;
42 };
43
flash_bank_setup(struct map_info * map,unsigned long ofs)44 static inline unsigned long flash_bank_setup(struct map_info *map, unsigned long ofs)
45 {
46 unsigned long (*set_bank)(unsigned long) =
47 (unsigned long(*)(unsigned long))map->map_priv_2;
48
49 return (set_bank ? set_bank(ofs) : ofs);
50 }
51
52 #ifdef __ARMEB__
53 /*
54 * Rev A0 and A1 of IXP2400 silicon have a broken addressing unit which
55 * causes the lower address bits to be XORed with 0x11 on 8 bit accesses
56 * and XORed with 0x10 on 16 bit accesses. See the spec update, erratum 44.
57 */
58 static int erratum44_workaround = 0;
59
address_fix8_write(unsigned long addr)60 static inline unsigned long address_fix8_write(unsigned long addr)
61 {
62 if (erratum44_workaround) {
63 return (addr ^ 3);
64 }
65 return addr;
66 }
67 #else
68
69 #define address_fix8_write(x) (x)
70 #endif
71
ixp2000_flash_read8(struct map_info * map,unsigned long ofs)72 static map_word ixp2000_flash_read8(struct map_info *map, unsigned long ofs)
73 {
74 map_word val;
75
76 val.x[0] = *((u8 *)(map->map_priv_1 + flash_bank_setup(map, ofs)));
77 return val;
78 }
79
80 /*
81 * We can't use the standard memcpy due to the broken SlowPort
82 * address translation on rev A0 and A1 silicon and the fact that
83 * we have banked flash.
84 */
ixp2000_flash_copy_from(struct map_info * map,void * to,unsigned long from,ssize_t len)85 static void ixp2000_flash_copy_from(struct map_info *map, void *to,
86 unsigned long from, ssize_t len)
87 {
88 from = flash_bank_setup(map, from);
89 while(len--)
90 *(__u8 *) to++ = *(__u8 *)(map->map_priv_1 + from++);
91 }
92
ixp2000_flash_write8(struct map_info * map,map_word d,unsigned long ofs)93 static void ixp2000_flash_write8(struct map_info *map, map_word d, unsigned long ofs)
94 {
95 *(__u8 *) (address_fix8_write(map->map_priv_1 +
96 flash_bank_setup(map, ofs))) = d.x[0];
97 }
98
ixp2000_flash_copy_to(struct map_info * map,unsigned long to,const void * from,ssize_t len)99 static void ixp2000_flash_copy_to(struct map_info *map, unsigned long to,
100 const void *from, ssize_t len)
101 {
102 to = flash_bank_setup(map, to);
103 while(len--) {
104 unsigned long tmp = address_fix8_write(map->map_priv_1 + to++);
105 *(__u8 *)(tmp) = *(__u8 *)(from++);
106 }
107 }
108
109
ixp2000_flash_remove(struct platform_device * dev)110 static int ixp2000_flash_remove(struct platform_device *dev)
111 {
112 struct flash_platform_data *plat = dev->dev.platform_data;
113 struct ixp2000_flash_info *info = platform_get_drvdata(dev);
114
115 platform_set_drvdata(dev, NULL);
116
117 if(!info)
118 return 0;
119
120 if (info->mtd) {
121 mtd_device_unregister(info->mtd);
122 map_destroy(info->mtd);
123 }
124 if (info->map.map_priv_1)
125 iounmap((void *) info->map.map_priv_1);
126
127 if (info->res) {
128 release_resource(info->res);
129 kfree(info->res);
130 }
131
132 if (plat->exit)
133 plat->exit();
134
135 return 0;
136 }
137
138
ixp2000_flash_probe(struct platform_device * dev)139 static int ixp2000_flash_probe(struct platform_device *dev)
140 {
141 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
142 struct ixp2000_flash_data *ixp_data = dev->dev.platform_data;
143 struct flash_platform_data *plat;
144 struct ixp2000_flash_info *info;
145 unsigned long window_size;
146 int err = -1;
147
148 if (!ixp_data)
149 return -ENODEV;
150
151 plat = ixp_data->platform_data;
152 if (!plat)
153 return -ENODEV;
154
155 window_size = resource_size(dev->resource);
156 dev_info(&dev->dev, "Probe of IXP2000 flash(%d banks x %dMiB)\n",
157 ixp_data->nr_banks, ((u32)window_size >> 20));
158
159 if (plat->width != 1) {
160 dev_err(&dev->dev, "IXP2000 MTD map only supports 8-bit mode, asking for %d\n",
161 plat->width * 8);
162 return -EIO;
163 }
164
165 info = kzalloc(sizeof(struct ixp2000_flash_info), GFP_KERNEL);
166 if(!info) {
167 err = -ENOMEM;
168 goto Error;
169 }
170
171 platform_set_drvdata(dev, info);
172
173 /*
174 * Tell the MTD layer we're not 1:1 mapped so that it does
175 * not attempt to do a direct access on us.
176 */
177 info->map.phys = NO_XIP;
178
179 info->map.size = ixp_data->nr_banks * window_size;
180 info->map.bankwidth = 1;
181
182 /*
183 * map_priv_2 is used to store a ptr to the bank_setup routine
184 */
185 info->map.map_priv_2 = (unsigned long) ixp_data->bank_setup;
186
187 info->map.name = dev_name(&dev->dev);
188 info->map.read = ixp2000_flash_read8;
189 info->map.write = ixp2000_flash_write8;
190 info->map.copy_from = ixp2000_flash_copy_from;
191 info->map.copy_to = ixp2000_flash_copy_to;
192
193 info->res = request_mem_region(dev->resource->start,
194 resource_size(dev->resource),
195 dev_name(&dev->dev));
196 if (!info->res) {
197 dev_err(&dev->dev, "Could not reserve memory region\n");
198 err = -ENOMEM;
199 goto Error;
200 }
201
202 info->map.map_priv_1 =
203 (unsigned long)ioremap(dev->resource->start,
204 resource_size(dev->resource));
205 if (!info->map.map_priv_1) {
206 dev_err(&dev->dev, "Failed to ioremap flash region\n");
207 err = -EIO;
208 goto Error;
209 }
210
211 #if defined(__ARMEB__)
212 /*
213 * Enable erratum 44 workaround for NPUs with broken slowport
214 */
215
216 erratum44_workaround = ixp2000_has_broken_slowport();
217 dev_info(&dev->dev, "Erratum 44 workaround %s\n",
218 erratum44_workaround ? "enabled" : "disabled");
219 #endif
220
221 info->mtd = do_map_probe(plat->map_name, &info->map);
222 if (!info->mtd) {
223 dev_err(&dev->dev, "map_probe failed\n");
224 err = -ENXIO;
225 goto Error;
226 }
227 info->mtd->owner = THIS_MODULE;
228
229 err = mtd_device_parse_register(info->mtd, probes, 0, NULL, 0);
230 if (err)
231 goto Error;
232
233 return 0;
234
235 Error:
236 ixp2000_flash_remove(dev);
237 return err;
238 }
239
240 static struct platform_driver ixp2000_flash_driver = {
241 .probe = ixp2000_flash_probe,
242 .remove = ixp2000_flash_remove,
243 .driver = {
244 .name = "IXP2000-Flash",
245 .owner = THIS_MODULE,
246 },
247 };
248
249 module_platform_driver(ixp2000_flash_driver);
250
251 MODULE_LICENSE("GPL");
252 MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>");
253 MODULE_ALIAS("platform:IXP2000-Flash");
254