1/*
2 * Flash memory access on AMD Alchemy evaluation boards
3 *
4 * (C) 2003, 2004 Pete Popov <ppopov@embeddedalley.com>
5 */
6
7#include <linux/init.h>
8#include <linux/module.h>
9#include <linux/types.h>
10#include <linux/kernel.h>
11
12#include <linux/mtd/mtd.h>
13#include <linux/mtd/map.h>
14#include <linux/mtd/partitions.h>
15
16#include <asm/io.h>
17
18#ifdef CONFIG_MIPS_PB1000
19#define BOARD_MAP_NAME "Pb1000 Flash"
20#define BOARD_FLASH_SIZE 0x00800000 /* 8MB */
21#define BOARD_FLASH_WIDTH 4 /* 32-bits */
22#endif
23
24#ifdef CONFIG_MIPS_PB1500
25#define BOARD_MAP_NAME "Pb1500 Flash"
26#define BOARD_FLASH_SIZE 0x04000000 /* 64MB */
27#define BOARD_FLASH_WIDTH 4 /* 32-bits */
28#endif
29
30#ifdef CONFIG_MIPS_PB1100
31#define BOARD_MAP_NAME "Pb1100 Flash"
32#define BOARD_FLASH_SIZE 0x04000000 /* 64MB */
33#define BOARD_FLASH_WIDTH 4 /* 32-bits */
34#endif
35
36#ifdef CONFIG_MIPS_PB1550
37#define BOARD_MAP_NAME "Pb1550 Flash"
38#define BOARD_FLASH_SIZE 0x08000000 /* 128MB */
39#define BOARD_FLASH_WIDTH 4 /* 32-bits */
40#endif
41
42#ifdef CONFIG_MIPS_PB1200
43#define BOARD_MAP_NAME "Pb1200 Flash"
44#define BOARD_FLASH_SIZE 0x08000000 /* 128MB */
45#define BOARD_FLASH_WIDTH 2 /* 16-bits */
46#endif
47
48#ifdef CONFIG_MIPS_DB1000
49#define BOARD_MAP_NAME "Db1000 Flash"
50#define BOARD_FLASH_SIZE 0x02000000 /* 32MB */
51#define BOARD_FLASH_WIDTH 4 /* 32-bits */
52#endif
53
54#ifdef CONFIG_MIPS_DB1500
55#define BOARD_MAP_NAME "Db1500 Flash"
56#define BOARD_FLASH_SIZE 0x02000000 /* 32MB */
57#define BOARD_FLASH_WIDTH 4 /* 32-bits */
58#endif
59
60#ifdef CONFIG_MIPS_DB1100
61#define BOARD_MAP_NAME "Db1100 Flash"
62#define BOARD_FLASH_SIZE 0x02000000 /* 32MB */
63#define BOARD_FLASH_WIDTH 4 /* 32-bits */
64#endif
65
66#ifdef CONFIG_MIPS_DB1550
67#define BOARD_MAP_NAME "Db1550 Flash"
68#define BOARD_FLASH_SIZE 0x08000000 /* 128MB */
69#define BOARD_FLASH_WIDTH 4 /* 32-bits */
70#endif
71
72#ifdef CONFIG_MIPS_DB1200
73#define BOARD_MAP_NAME "Db1200 Flash"
74#define BOARD_FLASH_SIZE 0x04000000 /* 64MB */
75#define BOARD_FLASH_WIDTH 2 /* 16-bits */
76#endif
77
78#ifdef CONFIG_MIPS_HYDROGEN3
79#define BOARD_MAP_NAME "Hydrogen3 Flash"
80#define BOARD_FLASH_SIZE 0x02000000 /* 32MB */
81#define BOARD_FLASH_WIDTH 4 /* 32-bits */
82#define USE_LOCAL_ACCESSORS /* why? */
83#endif
84
85#ifdef CONFIG_MIPS_BOSPORUS
86#define BOARD_MAP_NAME "Bosporus Flash"
87#define BOARD_FLASH_SIZE 0x01000000 /* 16MB */
88#define BOARD_FLASH_WIDTH 2 /* 16-bits */
89#endif
90
91#ifdef CONFIG_MIPS_MIRAGE
92#define BOARD_MAP_NAME "Mirage Flash"
93#define BOARD_FLASH_SIZE 0x04000000 /* 64MB */
94#define BOARD_FLASH_WIDTH 4 /* 32-bits */
95#define USE_LOCAL_ACCESSORS /* why? */
96#endif
97
98static struct map_info alchemy_map = {
99	.name =	BOARD_MAP_NAME,
100};
101
102static struct mtd_partition alchemy_partitions[] = {
103        {
104                .name = "User FS",
105                .size = BOARD_FLASH_SIZE - 0x00400000,
106                .offset = 0x0000000
107        },{
108                .name = "YAMON",
109                .size = 0x0100000,
110		.offset = MTDPART_OFS_APPEND,
111                .mask_flags = MTD_WRITEABLE
112        },{
113                .name = "raw kernel",
114		.size = (0x300000 - 0x40000), /* last 256KB is yamon env */
115		.offset = MTDPART_OFS_APPEND,
116        }
117};
118
119static struct mtd_info *mymtd;
120
121int __init alchemy_mtd_init(void)
122{
123	struct mtd_partition *parts;
124	int nb_parts = 0;
125	unsigned long window_addr;
126	unsigned long window_size;
127
128	/* Default flash buswidth */
129	alchemy_map.bankwidth = BOARD_FLASH_WIDTH;
130
131	window_addr = 0x20000000 - BOARD_FLASH_SIZE;
132	window_size = BOARD_FLASH_SIZE;
133#ifdef CONFIG_MIPS_MIRAGE_WHY
134	/* Boot ROM flash bank only; no user bank */
135	window_addr = 0x1C000000;
136	window_size = 0x04000000;
137	/* USERFS from 0x1C00 0000 to 0x1FC00000 */
138	alchemy_partitions[0].size = 0x03C00000;
139#endif
140
141	/*
142	 * Static partition definition selection
143	 */
144	parts = alchemy_partitions;
145	nb_parts = ARRAY_SIZE(alchemy_partitions);
146	alchemy_map.size = window_size;
147
148	/*
149	 * Now let's probe for the actual flash.  Do it here since
150	 * specific machine settings might have been set above.
151	 */
152	printk(KERN_NOTICE BOARD_MAP_NAME ": probing %d-bit flash bus\n",
153			alchemy_map.bankwidth*8);
154	alchemy_map.virt = ioremap(window_addr, window_size);
155	mymtd = do_map_probe("cfi_probe", &alchemy_map);
156	if (!mymtd) {
157		iounmap(alchemy_map.virt);
158		return -ENXIO;
159	}
160	mymtd->owner = THIS_MODULE;
161
162	add_mtd_partitions(mymtd, parts, nb_parts);
163	return 0;
164}
165
166static void __exit alchemy_mtd_cleanup(void)
167{
168	if (mymtd) {
169		del_mtd_partitions(mymtd);
170		map_destroy(mymtd);
171		iounmap(alchemy_map.virt);
172	}
173}
174
175module_init(alchemy_mtd_init);
176module_exit(alchemy_mtd_cleanup);
177
178MODULE_AUTHOR("Embedded Alley Solutions, Inc");
179MODULE_DESCRIPTION(BOARD_MAP_NAME " MTD driver");
180MODULE_LICENSE("GPL");
181