1 /*
2 * Mapping of a custom board with both AMD CFI and JEDEC flash in partitions.
3 * Config with both CFI and JEDEC device support.
4 *
5 * Basically physmap.c with the addition of partitions and
6 * an array of mapping info to accommodate more than one flash type per board.
7 *
8 * Copyright 2005-2007 PMC-Sierra, Inc.
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
14 *
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
16 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
17 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
18 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
21 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
22 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 * You should have received a copy of the GNU General Public License along
27 * with this program; if not, write to the Free Software Foundation, Inc.,
28 * 675 Mass Ave, Cambridge, MA 02139, USA.
29 */
30
31 #include <linux/slab.h>
32 #include <linux/module.h>
33 #include <linux/types.h>
34 #include <linux/kernel.h>
35 #include <linux/mtd/mtd.h>
36 #include <linux/mtd/map.h>
37 #include <linux/mtd/partitions.h>
38
39 #include <asm/io.h>
40
41 #include <msp_prom.h>
42 #include <msp_regs.h>
43
44
45 static struct mtd_info **msp_flash;
46 static struct mtd_partition **msp_parts;
47 static struct map_info *msp_maps;
48 static int fcnt;
49
50 #define DEBUG_MARKER printk(KERN_NOTICE "%s[%d]\n", __func__, __LINE__)
51
init_msp_flash(void)52 static int __init init_msp_flash(void)
53 {
54 int i, j, ret = -ENOMEM;
55 int offset, coff;
56 char *env;
57 int pcnt;
58 char flash_name[] = "flash0";
59 char part_name[] = "flash0_0";
60 unsigned addr, size;
61
62 /* If ELB is disabled by "ful-mux" mode, we can't get at flash */
63 if ((*DEV_ID_REG & DEV_ID_SINGLE_PC) &&
64 (*ELB_1PC_EN_REG & SINGLE_PCCARD)) {
65 printk(KERN_NOTICE "Single PC Card mode: no flash access\n");
66 return -ENXIO;
67 }
68
69 /* examine the prom environment for flash devices */
70 for (fcnt = 0; (env = prom_getenv(flash_name)); fcnt++)
71 flash_name[5] = '0' + fcnt + 1;
72
73 if (fcnt < 1)
74 return -ENXIO;
75
76 printk(KERN_NOTICE "Found %d PMC flash devices\n", fcnt);
77
78 msp_flash = kmalloc(fcnt * sizeof(struct map_info *), GFP_KERNEL);
79 if (!msp_flash)
80 return -ENOMEM;
81
82 msp_parts = kmalloc(fcnt * sizeof(struct mtd_partition *), GFP_KERNEL);
83 if (!msp_parts)
84 goto free_msp_flash;
85
86 msp_maps = kcalloc(fcnt, sizeof(struct mtd_info), GFP_KERNEL);
87 if (!msp_maps)
88 goto free_msp_parts;
89
90 /* loop over the flash devices, initializing each */
91 for (i = 0; i < fcnt; i++) {
92 /* examine the prom environment for flash partititions */
93 part_name[5] = '0' + i;
94 part_name[7] = '0';
95 for (pcnt = 0; (env = prom_getenv(part_name)); pcnt++)
96 part_name[7] = '0' + pcnt + 1;
97
98 if (pcnt == 0) {
99 printk(KERN_NOTICE "Skipping flash device %d "
100 "(no partitions defined)\n", i);
101 continue;
102 }
103
104 msp_parts[i] = kcalloc(pcnt, sizeof(struct mtd_partition),
105 GFP_KERNEL);
106 if (!msp_parts[i])
107 goto cleanup_loop;
108
109 /* now initialize the devices proper */
110 flash_name[5] = '0' + i;
111 env = prom_getenv(flash_name);
112
113 if (sscanf(env, "%x:%x", &addr, &size) < 2) {
114 ret = -ENXIO;
115 kfree(msp_parts[i]);
116 goto cleanup_loop;
117 }
118 addr = CPHYSADDR(addr);
119
120 printk(KERN_NOTICE
121 "MSP flash device \"%s\": 0x%08x at 0x%08x\n",
122 flash_name, size, addr);
123 /* This must matchs the actual size of the flash chip */
124 msp_maps[i].size = size;
125 msp_maps[i].phys = addr;
126
127 /*
128 * Platforms have a specific limit of the size of memory
129 * which may be mapped for flash:
130 */
131 if (size > CONFIG_MSP_FLASH_MAP_LIMIT)
132 size = CONFIG_MSP_FLASH_MAP_LIMIT;
133
134 msp_maps[i].virt = ioremap(addr, size);
135 if (msp_maps[i].virt == NULL) {
136 ret = -ENXIO;
137 kfree(msp_parts[i]);
138 goto cleanup_loop;
139 }
140
141 msp_maps[i].bankwidth = 1;
142 msp_maps[i].name = kmalloc(7, GFP_KERNEL);
143 if (!msp_maps[i].name) {
144 iounmap(msp_maps[i].virt);
145 kfree(msp_parts[i]);
146 goto cleanup_loop;
147 }
148
149 msp_maps[i].name = strncpy(msp_maps[i].name, flash_name, 7);
150
151 for (j = 0; j < pcnt; j++) {
152 part_name[5] = '0' + i;
153 part_name[7] = '0' + j;
154
155 env = prom_getenv(part_name);
156
157 if (sscanf(env, "%x:%x:%n", &offset, &size,
158 &coff) < 2) {
159 ret = -ENXIO;
160 kfree(msp_maps[i].name);
161 iounmap(msp_maps[i].virt);
162 kfree(msp_parts[i]);
163 goto cleanup_loop;
164 }
165
166 msp_parts[i][j].size = size;
167 msp_parts[i][j].offset = offset;
168 msp_parts[i][j].name = env + coff;
169 }
170
171 /* now probe and add the device */
172 simple_map_init(&msp_maps[i]);
173 msp_flash[i] = do_map_probe("cfi_probe", &msp_maps[i]);
174 if (msp_flash[i]) {
175 msp_flash[i]->owner = THIS_MODULE;
176 mtd_device_register(msp_flash[i], msp_parts[i], pcnt);
177 } else {
178 printk(KERN_ERR "map probe failed for flash\n");
179 ret = -ENXIO;
180 kfree(msp_maps[i].name);
181 iounmap(msp_maps[i].virt);
182 kfree(msp_parts[i]);
183 goto cleanup_loop;
184 }
185 }
186
187 return 0;
188
189 cleanup_loop:
190 while (i--) {
191 mtd_device_unregister(msp_flash[i]);
192 map_destroy(msp_flash[i]);
193 kfree(msp_maps[i].name);
194 iounmap(msp_maps[i].virt);
195 kfree(msp_parts[i]);
196 }
197 kfree(msp_maps);
198 free_msp_parts:
199 kfree(msp_parts);
200 free_msp_flash:
201 kfree(msp_flash);
202 return ret;
203 }
204
cleanup_msp_flash(void)205 static void __exit cleanup_msp_flash(void)
206 {
207 int i;
208
209 for (i = 0; i < fcnt; i++) {
210 mtd_device_unregister(msp_flash[i]);
211 map_destroy(msp_flash[i]);
212 iounmap((void *)msp_maps[i].virt);
213
214 /* free the memory */
215 kfree(msp_maps[i].name);
216 kfree(msp_parts[i]);
217 }
218
219 kfree(msp_flash);
220 kfree(msp_parts);
221 kfree(msp_maps);
222 }
223
224 MODULE_AUTHOR("PMC-Sierra, Inc");
225 MODULE_DESCRIPTION("MTD map driver for PMC-Sierra MSP boards");
226 MODULE_LICENSE("GPL");
227
228 module_init(init_msp_flash);
229 module_exit(cleanup_msp_flash);
230