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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * $Id: wr_sbc82xx_flash.c,v 1.8 2005/11/07 11:14:29 gleixner Exp $
3 *
4 * Map for flash chips on Wind River PowerQUICC II SBC82xx board.
5 *
6 * Copyright (C) 2004 Red Hat, Inc.
7 *
8 * Author: David Woodhouse <dwmw2@infradead.org>
9 *
10 */
11
12#include <linux/module.h>
13#include <linux/types.h>
14#include <linux/kernel.h>
15#include <linux/init.h>
16#include <linux/slab.h>
17#include <asm/io.h>
18#include <linux/mtd/mtd.h>
19#include <linux/mtd/map.h>
20#include <linux/config.h>
21#include <linux/mtd/partitions.h>
22
23#include <asm/immap_cpm2.h>
24
25static struct mtd_info *sbcmtd[3];
26static struct mtd_partition *sbcmtd_parts[3];
27
28struct map_info sbc82xx_flash_map[3] = {
29 {.name = "Boot flash"},
30 {.name = "Alternate boot flash"},
31 {.name = "User flash"}
32};
33
34static struct mtd_partition smallflash_parts[] = {
35 {
36 .name = "space",
37 .size = 0x100000,
38 .offset = 0,
39 }, {
40 .name = "bootloader",
41 .size = MTDPART_SIZ_FULL,
42 .offset = MTDPART_OFS_APPEND,
43 }
44};
45
46static struct mtd_partition bigflash_parts[] = {
47 {
48 .name = "bootloader",
49 .size = 0x00100000,
50 .offset = 0,
51 }, {
52 .name = "file system",
53 .size = 0x01f00000,
54 .offset = MTDPART_OFS_APPEND,
55 }, {
56 .name = "boot config",
57 .size = 0x00100000,
58 .offset = MTDPART_OFS_APPEND,
59 }, {
60 .name = "space",
61 .size = 0x01f00000,
62 .offset = MTDPART_OFS_APPEND,
63 }
64};
65
66static const char *part_probes[] __initdata = {"cmdlinepart", "RedBoot", NULL};
67
68#define init_sbc82xx_one_flash(map, br, or) \
69do { \
70 (map).phys = (br & 1) ? (br & 0xffff8000) : 0; \
71 (map).size = (br & 1) ? (~(or & 0xffff8000) + 1) : 0; \
72 switch (br & 0x00001800) { \
73 case 0x00000000: \
74 case 0x00000800: (map).bankwidth = 1; break; \
75 case 0x00001000: (map).bankwidth = 2; break; \
76 case 0x00001800: (map).bankwidth = 4; break; \
77 } \
78} while (0);
79
80int __init init_sbc82xx_flash(void)
81{
82 volatile memctl_cpm2_t *mc = &cpm2_immr->im_memctl;
83 int bigflash;
84 int i;
85
86#ifdef CONFIG_SBC8560
87 mc = ioremap(0xff700000 + 0x5000, sizeof(memctl_cpm2_t));
88#else
89 mc = &cpm2_immr->im_memctl;
90#endif
91
92 bigflash = 1;
93 if ((mc->memc_br0 & 0x00001800) == 0x00001800)
94 bigflash = 0;
95
96 init_sbc82xx_one_flash(sbc82xx_flash_map[0], mc->memc_br0, mc->memc_or0);
97 init_sbc82xx_one_flash(sbc82xx_flash_map[1], mc->memc_br6, mc->memc_or6);
98 init_sbc82xx_one_flash(sbc82xx_flash_map[2], mc->memc_br1, mc->memc_or1);
99
100#ifdef CONFIG_SBC8560
101 iounmap((void *) mc);
102#endif
103
104 for (i=0; i<3; i++) {
105 int8_t flashcs[3] = { 0, 6, 1 };
106 int nr_parts;
107
108 printk(KERN_NOTICE "PowerQUICC II %s (%ld MiB on CS%d",
109 sbc82xx_flash_map[i].name,
110 (sbc82xx_flash_map[i].size >> 20),
111 flashcs[i]);
112 if (!sbc82xx_flash_map[i].phys) {
113 /* We know it can't be at zero. */
114 printk("): disabled by bootloader.\n");
115 continue;
116 }
117 printk(" at %08lx)\n", sbc82xx_flash_map[i].phys);
118
119 sbc82xx_flash_map[i].virt = ioremap(sbc82xx_flash_map[i].phys, sbc82xx_flash_map[i].size);
120
121 if (!sbc82xx_flash_map[i].virt) {
122 printk("Failed to ioremap\n");
123 continue;
124 }
125
126 simple_map_init(&sbc82xx_flash_map[i]);
127
128 sbcmtd[i] = do_map_probe("cfi_probe", &sbc82xx_flash_map[i]);
129
130 if (!sbcmtd[i])
131 continue;
132
133 sbcmtd[i]->owner = THIS_MODULE;
134
135 nr_parts = parse_mtd_partitions(sbcmtd[i], part_probes,
136 &sbcmtd_parts[i], 0);
137 if (nr_parts > 0) {
138 add_mtd_partitions (sbcmtd[i], sbcmtd_parts[i], nr_parts);
139 continue;
140 }
141
142 /* No partitioning detected. Use default */
143 if (i == 2) {
144 add_mtd_device(sbcmtd[i]);
145 } else if (i == bigflash) {
146 add_mtd_partitions (sbcmtd[i], bigflash_parts, ARRAY_SIZE(bigflash_parts));
147 } else {
148 add_mtd_partitions (sbcmtd[i], smallflash_parts, ARRAY_SIZE(smallflash_parts));
149 }
150 }
151 return 0;
152}
153
154static void __exit cleanup_sbc82xx_flash(void)
155{
156 int i;
157
158 for (i=0; i<3; i++) {
159 if (!sbcmtd[i])
160 continue;
161
162 if (i<2 || sbcmtd_parts[i])
163 del_mtd_partitions(sbcmtd[i]);
164 else
165 del_mtd_device(sbcmtd[i]);
166
167 kfree(sbcmtd_parts[i]);
168 map_destroy(sbcmtd[i]);
169
170 iounmap((void *)sbc82xx_flash_map[i].virt);
171 sbc82xx_flash_map[i].virt = 0;
172 }
173}
174
175module_init(init_sbc82xx_flash);
176module_exit(cleanup_sbc82xx_flash);
177
178
179MODULE_LICENSE("GPL");
180MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
181MODULE_DESCRIPTION("Flash map driver for WindRiver PowerQUICC II");