tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Flash memory access on Hynix GMS30C7201/HMS30C7202 based
3 * evaluation boards
4 *
5 * $Id: h720x-flash.c,v 1.12 2005/11/07 11:14:27 gleixner Exp $
6 *
7 * (C) 2002 Jungjun Kim <jungjun.kim@hynix.com>
8 * 2003 Thomas Gleixner <tglx@linutronix.de>
9 */
10
11#include <linux/config.h>
12#include <linux/module.h>
13#include <linux/types.h>
14#include <linux/kernel.h>
15#include <linux/init.h>
16#include <linux/errno.h>
17#include <linux/slab.h>
18
19#include <linux/mtd/mtd.h>
20#include <linux/mtd/map.h>
21#include <linux/mtd/partitions.h>
22#include <asm/hardware.h>
23#include <asm/io.h>
24
25static struct mtd_info *mymtd;
26
27static struct map_info h720x_map = {
28 .name = "H720X",
29 .bankwidth = 4,
30 .size = FLASH_SIZE,
31 .phys = FLASH_PHYS,
32};
33
34static struct mtd_partition h720x_partitions[] = {
35 {
36 .name = "ArMon",
37 .size = 0x00080000,
38 .offset = 0,
39 .mask_flags = MTD_WRITEABLE
40 },{
41 .name = "Env",
42 .size = 0x00040000,
43 .offset = 0x00080000,
44 .mask_flags = MTD_WRITEABLE
45 },{
46 .name = "Kernel",
47 .size = 0x00180000,
48 .offset = 0x000c0000,
49 .mask_flags = MTD_WRITEABLE
50 },{
51 .name = "Ramdisk",
52 .size = 0x00400000,
53 .offset = 0x00240000,
54 .mask_flags = MTD_WRITEABLE
55 },{
56 .name = "jffs2",
57 .size = MTDPART_SIZ_FULL,
58 .offset = MTDPART_OFS_APPEND
59 }
60};
61
62#define NUM_PARTITIONS (sizeof(h720x_partitions)/sizeof(h720x_partitions[0]))
63
64static int nr_mtd_parts;
65static struct mtd_partition *mtd_parts;
66static const char *probes[] = { "cmdlinepart", NULL };
67
68/*
69 * Initialize FLASH support
70 */
71int __init h720x_mtd_init(void)
72{
73
74 char *part_type = NULL;
75
76 h720x_map.virt = ioremap(FLASH_PHYS, FLASH_SIZE);
77
78 if (!h720x_map.virt) {
79 printk(KERN_ERR "H720x-MTD: ioremap failed\n");
80 return -EIO;
81 }
82
83 simple_map_init(&h720x_map);
84
85 // Probe for flash bankwidth 4
86 printk (KERN_INFO "H720x-MTD probing 32bit FLASH\n");
87 mymtd = do_map_probe("cfi_probe", &h720x_map);
88 if (!mymtd) {
89 printk (KERN_INFO "H720x-MTD probing 16bit FLASH\n");
90 // Probe for bankwidth 2
91 h720x_map.bankwidth = 2;
92 mymtd = do_map_probe("cfi_probe", &h720x_map);
93 }
94
95 if (mymtd) {
96 mymtd->owner = THIS_MODULE;
97
98#ifdef CONFIG_MTD_PARTITIONS
99 nr_mtd_parts = parse_mtd_partitions(mymtd, probes, &mtd_parts, 0);
100 if (nr_mtd_parts > 0)
101 part_type = "command line";
102#endif
103 if (nr_mtd_parts <= 0) {
104 mtd_parts = h720x_partitions;
105 nr_mtd_parts = NUM_PARTITIONS;
106 part_type = "builtin";
107 }
108 printk(KERN_INFO "Using %s partition table\n", part_type);
109 add_mtd_partitions(mymtd, mtd_parts, nr_mtd_parts);
110 return 0;
111 }
112
113 iounmap((void *)h720x_map.virt);
114 return -ENXIO;
115}
116
117/*
118 * Cleanup
119 */
120static void __exit h720x_mtd_cleanup(void)
121{
122
123 if (mymtd) {
124 del_mtd_partitions(mymtd);
125 map_destroy(mymtd);
126 }
127
128 /* Free partition info, if commandline partition was used */
129 if (mtd_parts && (mtd_parts != h720x_partitions))
130 kfree (mtd_parts);
131
132 if (h720x_map.virt) {
133 iounmap((void *)h720x_map.virt);
134 h720x_map.virt = 0;
135 }
136}
137
138
139module_init(h720x_mtd_init);
140module_exit(h720x_mtd_cleanup);
141
142MODULE_LICENSE("GPL");
143MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>");
144MODULE_DESCRIPTION("MTD map driver for Hynix evaluation boards");