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