tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 accomodate 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/module.h>
32#include <linux/types.h>
33#include <linux/kernel.h>
34#include <linux/mtd/mtd.h>
35#include <linux/mtd/map.h>
36#include <linux/mtd/partitions.h>
37
38#include <asm/io.h>
39
40#include <msp_prom.h>
41#include <msp_regs.h>
42
43
44static struct mtd_info **msp_flash;
45static struct mtd_partition **msp_parts;
46static struct map_info *msp_maps;
47static int fcnt;
48
49#define DEBUG_MARKER printk(KERN_NOTICE "%s[%d]\n", __func__, __LINE__)
50
51static int __init init_msp_flash(void)
52{
53 int i, j;
54 int offset, coff;
55 char *env;
56 int pcnt;
57 char flash_name[] = "flash0";
58 char part_name[] = "flash0_0";
59 unsigned addr, size;
60
61 /* If ELB is disabled by "ful-mux" mode, we can't get at flash */
62 if ((*DEV_ID_REG & DEV_ID_SINGLE_PC) &&
63 (*ELB_1PC_EN_REG & SINGLE_PCCARD)) {
64 printk(KERN_NOTICE "Single PC Card mode: no flash access\n");
65 return -ENXIO;
66 }
67
68 /* examine the prom environment for flash devices */
69 for (fcnt = 0; (env = prom_getenv(flash_name)); fcnt++)
70 flash_name[5] = '0' + fcnt + 1;
71
72 if (fcnt < 1)
73 return -ENXIO;
74
75 printk(KERN_NOTICE "Found %d PMC flash devices\n", fcnt);
76
77 msp_flash = kmalloc(fcnt * sizeof(struct map_info *), GFP_KERNEL);
78 msp_parts = kmalloc(fcnt * sizeof(struct mtd_partition *), GFP_KERNEL);
79 msp_maps = kcalloc(fcnt, sizeof(struct mtd_info), GFP_KERNEL);
80 if (!msp_flash || !msp_parts || !msp_maps) {
81 kfree(msp_maps);
82 kfree(msp_parts);
83 kfree(msp_flash);
84 return -ENOMEM;
85 }
86
87 /* loop over the flash devices, initializing each */
88 for (i = 0; i < fcnt; i++) {
89 /* examine the prom environment for flash partititions */
90 part_name[5] = '0' + i;
91 part_name[7] = '0';
92 for (pcnt = 0; (env = prom_getenv(part_name)); pcnt++)
93 part_name[7] = '0' + pcnt + 1;
94
95 if (pcnt == 0) {
96 printk(KERN_NOTICE "Skipping flash device %d "
97 "(no partitions defined)\n", i);
98 continue;
99 }
100
101 msp_parts[i] = kcalloc(pcnt, sizeof(struct mtd_partition),
102 GFP_KERNEL);
103
104 /* now initialize the devices proper */
105 flash_name[5] = '0' + i;
106 env = prom_getenv(flash_name);
107
108 if (sscanf(env, "%x:%x", &addr, &size) < 2)
109 return -ENXIO;
110 addr = CPHYSADDR(addr);
111
112 printk(KERN_NOTICE
113 "MSP flash device \"%s\": 0x%08x at 0x%08x\n",
114 flash_name, size, addr);
115 /* This must matchs the actual size of the flash chip */
116 msp_maps[i].size = size;
117 msp_maps[i].phys = addr;
118
119 /*
120 * Platforms have a specific limit of the size of memory
121 * which may be mapped for flash:
122 */
123 if (size > CONFIG_MSP_FLASH_MAP_LIMIT)
124 size = CONFIG_MSP_FLASH_MAP_LIMIT;
125 msp_maps[i].virt = ioremap(addr, size);
126 msp_maps[i].bankwidth = 1;
127 msp_maps[i].name = strncpy(kmalloc(7, GFP_KERNEL),
128 flash_name, 7);
129
130 if (msp_maps[i].virt == NULL)
131 return -ENXIO;
132
133 for (j = 0; j < pcnt; j++) {
134 part_name[5] = '0' + i;
135 part_name[7] = '0' + j;
136
137 env = prom_getenv(part_name);
138
139 if (sscanf(env, "%x:%x:%n", &offset, &size, &coff) < 2)
140 return -ENXIO;
141
142 msp_parts[i][j].size = size;
143 msp_parts[i][j].offset = offset;
144 msp_parts[i][j].name = env + coff;
145 }
146
147 /* now probe and add the device */
148 simple_map_init(&msp_maps[i]);
149 msp_flash[i] = do_map_probe("cfi_probe", &msp_maps[i]);
150 if (msp_flash[i]) {
151 msp_flash[i]->owner = THIS_MODULE;
152 add_mtd_partitions(msp_flash[i], msp_parts[i], pcnt);
153 } else {
154 printk(KERN_ERR "map probe failed for flash\n");
155 return -ENXIO;
156 }
157 }
158
159 return 0;
160}
161
162static void __exit cleanup_msp_flash(void)
163{
164 int i;
165
166 for (i = 0; i < sizeof(msp_flash) / sizeof(struct mtd_info **); i++) {
167 del_mtd_partitions(msp_flash[i]);
168 map_destroy(msp_flash[i]);
169 iounmap((void *)msp_maps[i].virt);
170
171 /* free the memory */
172 kfree(msp_maps[i].name);
173 kfree(msp_parts[i]);
174 }
175
176 kfree(msp_flash);
177 kfree(msp_parts);
178 kfree(msp_maps);
179}
180
181MODULE_AUTHOR("PMC-Sierra, Inc");
182MODULE_DESCRIPTION("MTD map driver for PMC-Sierra MSP boards");
183MODULE_LICENSE("GPL");
184
185module_init(init_msp_flash);
186module_exit(cleanup_msp_flash);