tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/*
2 * $Id: lubbock-flash.c,v 1.19 2004/11/04 13:24:15 gleixner Exp $
3 *
4 * Map driver for the Lubbock developer platform.
5 *
6 * Author: Nicolas Pitre
7 * Copyright: (C) 2001 MontaVista Software Inc.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/module.h>
15#include <linux/types.h>
16#include <linux/kernel.h>
17#include <linux/init.h>
18#include <linux/dma-mapping.h>
19#include <linux/mtd/mtd.h>
20#include <linux/mtd/map.h>
21#include <linux/mtd/partitions.h>
22#include <asm/io.h>
23#include <asm/hardware.h>
24#include <asm/arch/pxa-regs.h>
25#include <asm/arch/lubbock.h>
26
27
28#define ROM_ADDR 0x00000000
29#define FLASH_ADDR 0x04000000
30
31#define WINDOW_SIZE 64*1024*1024
32
33static void lubbock_map_inval_cache(struct map_info *map, unsigned long from, ssize_t len)
34{
35 consistent_sync((char *)map->cached + from, len, DMA_FROM_DEVICE);
36}
37
38static struct map_info lubbock_maps[2] = { {
39 .size = WINDOW_SIZE,
40 .phys = 0x00000000,
41 .inval_cache = lubbock_map_inval_cache,
42}, {
43 .size = WINDOW_SIZE,
44 .phys = 0x04000000,
45 .inval_cache = lubbock_map_inval_cache,
46} };
47
48static struct mtd_partition lubbock_partitions[] = {
49 {
50 .name = "Bootloader",
51 .size = 0x00040000,
52 .offset = 0,
53 .mask_flags = MTD_WRITEABLE /* force read-only */
54 },{
55 .name = "Kernel",
56 .size = 0x00100000,
57 .offset = 0x00040000,
58 },{
59 .name = "Filesystem",
60 .size = MTDPART_SIZ_FULL,
61 .offset = 0x00140000
62 }
63};
64
65static struct mtd_info *mymtds[2];
66static struct mtd_partition *parsed_parts[2];
67static int nr_parsed_parts[2];
68
69static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
70
71static int __init init_lubbock(void)
72{
73 int flashboot = (LUB_CONF_SWITCHES & 1);
74 int ret = 0, i;
75
76 lubbock_maps[0].bankwidth = lubbock_maps[1].bankwidth =
77 (BOOT_DEF & 1) ? 2 : 4;
78
79 /* Compensate for the nROMBT switch which swaps the flash banks */
80 printk(KERN_NOTICE "Lubbock configured to boot from %s (bank %d)\n",
81 flashboot?"Flash":"ROM", flashboot);
82
83 lubbock_maps[flashboot^1].name = "Lubbock Application Flash";
84 lubbock_maps[flashboot].name = "Lubbock Boot ROM";
85
86 for (i = 0; i < 2; i++) {
87 lubbock_maps[i].virt = ioremap(lubbock_maps[i].phys, WINDOW_SIZE);
88 if (!lubbock_maps[i].virt) {
89 printk(KERN_WARNING "Failed to ioremap %s\n", lubbock_maps[i].name);
90 if (!ret)
91 ret = -ENOMEM;
92 continue;
93 }
94 lubbock_maps[i].cached = ioremap_cached(lubbock_maps[i].phys, WINDOW_SIZE);
95 if (!lubbock_maps[i].cached)
96 printk(KERN_WARNING "Failed to ioremap cached %s\n", lubbock_maps[i].name);
97 simple_map_init(&lubbock_maps[i]);
98
99 printk(KERN_NOTICE "Probing %s at physical address 0x%08lx (%d-bit bankwidth)\n",
100 lubbock_maps[i].name, lubbock_maps[i].phys,
101 lubbock_maps[i].bankwidth * 8);
102
103 mymtds[i] = do_map_probe("cfi_probe", &lubbock_maps[i]);
104
105 if (!mymtds[i]) {
106 iounmap((void *)lubbock_maps[i].virt);
107 if (lubbock_maps[i].cached)
108 iounmap(lubbock_maps[i].cached);
109 if (!ret)
110 ret = -EIO;
111 continue;
112 }
113 mymtds[i]->owner = THIS_MODULE;
114
115 ret = parse_mtd_partitions(mymtds[i], probes,
116 &parsed_parts[i], 0);
117
118 if (ret > 0)
119 nr_parsed_parts[i] = ret;
120 }
121
122 if (!mymtds[0] && !mymtds[1])
123 return ret;
124
125 for (i = 0; i < 2; i++) {
126 if (!mymtds[i]) {
127 printk(KERN_WARNING "%s is absent. Skipping\n", lubbock_maps[i].name);
128 } else if (nr_parsed_parts[i]) {
129 add_mtd_partitions(mymtds[i], parsed_parts[i], nr_parsed_parts[i]);
130 } else if (!i) {
131 printk("Using static partitions on %s\n", lubbock_maps[i].name);
132 add_mtd_partitions(mymtds[i], lubbock_partitions, ARRAY_SIZE(lubbock_partitions));
133 } else {
134 printk("Registering %s as whole device\n", lubbock_maps[i].name);
135 add_mtd_device(mymtds[i]);
136 }
137 }
138 return 0;
139}
140
141static void __exit cleanup_lubbock(void)
142{
143 int i;
144 for (i = 0; i < 2; i++) {
145 if (!mymtds[i])
146 continue;
147
148 if (nr_parsed_parts[i] || !i)
149 del_mtd_partitions(mymtds[i]);
150 else
151 del_mtd_device(mymtds[i]);
152
153 map_destroy(mymtds[i]);
154 iounmap((void *)lubbock_maps[i].virt);
155 if (lubbock_maps[i].cached)
156 iounmap(lubbock_maps[i].cached);
157
158 if (parsed_parts[i])
159 kfree(parsed_parts[i]);
160 }
161}
162
163module_init(init_lubbock);
164module_exit(cleanup_lubbock);
165
166MODULE_LICENSE("GPL");
167MODULE_AUTHOR("Nicolas Pitre <nico@cam.org>");
168MODULE_DESCRIPTION("MTD map driver for Intel Lubbock");