xref: /linux/drivers/mtd/maps/impa7.c (revision f3d9478b2ce468c3115b02ecae7e975990697f15)
1 /*
2  * $Id: impa7.c,v 1.14 2005/11/07 11:14:27 gleixner Exp $
3  *
4  * Handle mapping of the NOR flash on implementa A7 boards
5  *
6  * Copyright 2002 SYSGO Real-Time Solutions GmbH
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  */
12 
13 #include <linux/module.h>
14 #include <linux/types.h>
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <asm/io.h>
18 #include <linux/mtd/mtd.h>
19 #include <linux/mtd/map.h>
20 #include <linux/config.h>
21 
22 #ifdef CONFIG_MTD_PARTITIONS
23 #include <linux/mtd/partitions.h>
24 #endif
25 
26 #define WINDOW_ADDR0 0x00000000      /* physical properties of flash */
27 #define WINDOW_SIZE0 0x00800000
28 #define WINDOW_ADDR1 0x10000000      /* physical properties of flash */
29 #define WINDOW_SIZE1 0x00800000
30 #define NUM_FLASHBANKS 2
31 #define BUSWIDTH     4
32 
33 /* can be { "cfi_probe", "jedec_probe", "map_rom", NULL } */
34 #define PROBETYPES { "jedec_probe", NULL }
35 
36 #define MSG_PREFIX "impA7:"   /* prefix for our printk()'s */
37 #define MTDID      "impa7-%d"  /* for mtdparts= partitioning */
38 
39 static struct mtd_info *impa7_mtd[NUM_FLASHBANKS];
40 
41 
42 static struct map_info impa7_map[NUM_FLASHBANKS] = {
43 	{
44 		.name = "impA7 NOR Flash Bank #0",
45 		.size = WINDOW_SIZE0,
46 		.bankwidth = BUSWIDTH,
47 	},
48 	{
49 		.name = "impA7 NOR Flash Bank #1",
50 		.size = WINDOW_SIZE1,
51 		.bankwidth = BUSWIDTH,
52 	},
53 };
54 
55 #ifdef CONFIG_MTD_PARTITIONS
56 
57 /*
58  * MTD partitioning stuff
59  */
60 static struct mtd_partition static_partitions[] =
61 {
62 	{
63 		.name = "FileSystem",
64 		.size = 0x800000,
65 		.offset = 0x00000000
66 	},
67 };
68 
69 static int mtd_parts_nb[NUM_FLASHBANKS];
70 static struct mtd_partition *mtd_parts[NUM_FLASHBANKS];
71 
72 #endif
73 
74 static const char *probes[] = { "cmdlinepart", NULL };
75 
76 int __init init_impa7(void)
77 {
78 	static const char *rom_probe_types[] = PROBETYPES;
79 	const char **type;
80 	const char *part_type = 0;
81 	int i;
82 	static struct { u_long addr; u_long size; } pt[NUM_FLASHBANKS] = {
83 	  { WINDOW_ADDR0, WINDOW_SIZE0 },
84 	  { WINDOW_ADDR1, WINDOW_SIZE1 },
85         };
86 	int devicesfound = 0;
87 
88 	for(i=0; i<NUM_FLASHBANKS; i++)
89 	{
90 		printk(KERN_NOTICE MSG_PREFIX "probing 0x%08lx at 0x%08lx\n",
91 		       pt[i].size, pt[i].addr);
92 
93 		impa7_map[i].phys = pt[i].addr;
94 		impa7_map[i].virt = ioremap(pt[i].addr, pt[i].size);
95 		if (!impa7_map[i].virt) {
96 			printk(MSG_PREFIX "failed to ioremap\n");
97 			return -EIO;
98 		}
99 		simple_map_init(&impa7_map[i]);
100 
101 		impa7_mtd[i] = 0;
102 		type = rom_probe_types;
103 		for(; !impa7_mtd[i] && *type; type++) {
104 			impa7_mtd[i] = do_map_probe(*type, &impa7_map[i]);
105 		}
106 
107 		if (impa7_mtd[i]) {
108 			impa7_mtd[i]->owner = THIS_MODULE;
109 			devicesfound++;
110 #ifdef CONFIG_MTD_PARTITIONS
111 			mtd_parts_nb[i] = parse_mtd_partitions(impa7_mtd[i],
112 							       probes,
113 							       &mtd_parts[i],
114 							       0);
115 			if (mtd_parts_nb[i] > 0) {
116 				part_type = "command line";
117 			} else {
118 				mtd_parts[i] = static_partitions;
119 				mtd_parts_nb[i] = ARRAY_SIZE(static_partitions);
120 				part_type = "static";
121 			}
122 
123 			printk(KERN_NOTICE MSG_PREFIX
124 			       "using %s partition definition\n",
125 			       part_type);
126 			add_mtd_partitions(impa7_mtd[i],
127 					   mtd_parts[i], mtd_parts_nb[i]);
128 #else
129 			add_mtd_device(impa7_mtd[i]);
130 
131 #endif
132 		}
133 		else
134 			iounmap((void *)impa7_map[i].virt);
135 	}
136 	return devicesfound == 0 ? -ENXIO : 0;
137 }
138 
139 static void __exit cleanup_impa7(void)
140 {
141 	int i;
142 	for (i=0; i<NUM_FLASHBANKS; i++) {
143 		if (impa7_mtd[i]) {
144 #ifdef CONFIG_MTD_PARTITIONS
145 			del_mtd_partitions(impa7_mtd[i]);
146 #else
147 			del_mtd_device(impa7_mtd[i]);
148 #endif
149 			map_destroy(impa7_mtd[i]);
150 			iounmap((void *)impa7_map[i].virt);
151 			impa7_map[i].virt = 0;
152 		}
153 	}
154 }
155 
156 module_init(init_impa7);
157 module_exit(cleanup_impa7);
158 
159 MODULE_LICENSE("GPL");
160 MODULE_AUTHOR("Pavel Bartusek <pba@sysgo.de>");
161 MODULE_DESCRIPTION("MTD map driver for implementa impA7");
162