1/*
2 * $Id: wr_sbc82xx_flash.c,v 1.1.1.1 2007/08/03 18:52:44 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/mtd/partitions.h>
21
22#include <asm/immap_cpm2.h>
23
24static struct mtd_info *sbcmtd[3];
25static struct mtd_partition *sbcmtd_parts[3];
26
27struct map_info sbc82xx_flash_map[3] = {
28	{.name = "Boot flash"},
29	{.name = "Alternate boot flash"},
30	{.name = "User flash"}
31};
32
33static struct mtd_partition smallflash_parts[] = {
34	{
35		.name =		"space",
36		.size =		0x100000,
37		.offset =	0,
38	}, {
39		.name =		"bootloader",
40		.size =		MTDPART_SIZ_FULL,
41		.offset =	MTDPART_OFS_APPEND,
42	}
43};
44
45static struct mtd_partition bigflash_parts[] = {
46	{
47		.name =		"bootloader",
48		.size =		0x00100000,
49		.offset =	0,
50	}, {
51		.name =		"file system",
52		.size =		0x01f00000,
53		.offset =	MTDPART_OFS_APPEND,
54	}, {
55		.name =		"boot config",
56		.size =		0x00100000,
57		.offset =	MTDPART_OFS_APPEND,
58	}, {
59		.name =		"space",
60		.size =		0x01f00000,
61		.offset =	MTDPART_OFS_APPEND,
62	}
63};
64
65static const char *part_probes[] __initdata = {"cmdlinepart", "RedBoot", NULL};
66
67#define init_sbc82xx_one_flash(map, br, or)			\
68do {								\
69	(map).phys = (br & 1) ? (br & 0xffff8000) : 0;		\
70	(map).size = (br & 1) ? (~(or & 0xffff8000) + 1) : 0;	\
71	switch (br & 0x00001800) {				\
72	case 0x00000000:					\
73	case 0x00000800:	(map).bankwidth = 1;	break;	\
74	case 0x00001000:	(map).bankwidth = 2;	break;	\
75	case 0x00001800:	(map).bankwidth = 4;	break;	\
76	}							\
77} while (0);
78
79int __init init_sbc82xx_flash(void)
80{
81	volatile memctl_cpm2_t *mc = &cpm2_immr->im_memctl;
82	int bigflash;
83	int i;
84
85#ifdef CONFIG_SBC8560
86	mc = ioremap(0xff700000 + 0x5000, sizeof(memctl_cpm2_t));
87#else
88	mc = &cpm2_immr->im_memctl;
89#endif
90
91	bigflash = 1;
92	if ((mc->memc_br0 & 0x00001800) == 0x00001800)
93		bigflash = 0;
94
95	init_sbc82xx_one_flash(sbc82xx_flash_map[0], mc->memc_br0, mc->memc_or0);
96	init_sbc82xx_one_flash(sbc82xx_flash_map[1], mc->memc_br6, mc->memc_or6);
97	init_sbc82xx_one_flash(sbc82xx_flash_map[2], mc->memc_br1, mc->memc_or1);
98
99#ifdef CONFIG_SBC8560
100	iounmap((void *) mc);
101#endif
102
103	for (i=0; i<3; i++) {
104		int8_t flashcs[3] = { 0, 6, 1 };
105		int nr_parts;
106
107		printk(KERN_NOTICE "PowerQUICC II %s (%ld MiB on CS%d",
108		       sbc82xx_flash_map[i].name,
109		       (sbc82xx_flash_map[i].size >> 20),
110		       flashcs[i]);
111		if (!sbc82xx_flash_map[i].phys) {
112			/* We know it can't be at zero. */
113			printk("): disabled by bootloader.\n");
114			continue;
115		}
116		printk(" at %08lx)\n",  sbc82xx_flash_map[i].phys);
117
118		sbc82xx_flash_map[i].virt = ioremap(sbc82xx_flash_map[i].phys, sbc82xx_flash_map[i].size);
119
120		if (!sbc82xx_flash_map[i].virt) {
121			printk("Failed to ioremap\n");
122			continue;
123		}
124
125		simple_map_init(&sbc82xx_flash_map[i]);
126
127		sbcmtd[i] = do_map_probe("cfi_probe", &sbc82xx_flash_map[i]);
128
129		if (!sbcmtd[i])
130			continue;
131
132		sbcmtd[i]->owner = THIS_MODULE;
133
134		nr_parts = parse_mtd_partitions(sbcmtd[i], part_probes,
135						&sbcmtd_parts[i], 0);
136		if (nr_parts > 0) {
137			add_mtd_partitions (sbcmtd[i], sbcmtd_parts[i], nr_parts);
138			continue;
139		}
140
141		/* No partitioning detected. Use default */
142		if (i == 2) {
143			add_mtd_device(sbcmtd[i]);
144		} else if (i == bigflash) {
145			add_mtd_partitions (sbcmtd[i], bigflash_parts, ARRAY_SIZE(bigflash_parts));
146		} else {
147			add_mtd_partitions (sbcmtd[i], smallflash_parts, ARRAY_SIZE(smallflash_parts));
148		}
149	}
150	return 0;
151}
152
153static void __exit cleanup_sbc82xx_flash(void)
154{
155	int i;
156
157	for (i=0; i<3; i++) {
158		if (!sbcmtd[i])
159			continue;
160
161		if (i<2 || sbcmtd_parts[i])
162			del_mtd_partitions(sbcmtd[i]);
163		else
164			del_mtd_device(sbcmtd[i]);
165
166		kfree(sbcmtd_parts[i]);
167		map_destroy(sbcmtd[i]);
168
169		iounmap((void *)sbc82xx_flash_map[i].virt);
170		sbc82xx_flash_map[i].virt = 0;
171	}
172}
173
174module_init(init_sbc82xx_flash);
175module_exit(cleanup_sbc82xx_flash);
176
177
178MODULE_LICENSE("GPL");
179MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
180MODULE_DESCRIPTION("Flash map driver for WindRiver PowerQUICC II");
181