1 /*
2 * Flash memory access on Hynix GMS30C7201/HMS30C7202 based
3 * evaluation boards
4 *
5 * (C) 2002 Jungjun Kim <jungjun.kim@hynix.com>
6 * 2003 Thomas Gleixner <tglx@linutronix.de>
7 */
8
9 #include <linux/module.h>
10 #include <linux/types.h>
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/errno.h>
14 #include <linux/slab.h>
15
16 #include <linux/mtd/mtd.h>
17 #include <linux/mtd/map.h>
18 #include <linux/mtd/partitions.h>
19 #include <mach/hardware.h>
20 #include <asm/io.h>
21
22 static struct mtd_info *mymtd;
23
24 static struct map_info h720x_map = {
25 .name = "H720X",
26 .bankwidth = 4,
27 .size = H720X_FLASH_SIZE,
28 .phys = H720X_FLASH_PHYS,
29 };
30
31 static struct mtd_partition h720x_partitions[] = {
32 {
33 .name = "ArMon",
34 .size = 0x00080000,
35 .offset = 0,
36 .mask_flags = MTD_WRITEABLE
37 },{
38 .name = "Env",
39 .size = 0x00040000,
40 .offset = 0x00080000,
41 .mask_flags = MTD_WRITEABLE
42 },{
43 .name = "Kernel",
44 .size = 0x00180000,
45 .offset = 0x000c0000,
46 .mask_flags = MTD_WRITEABLE
47 },{
48 .name = "Ramdisk",
49 .size = 0x00400000,
50 .offset = 0x00240000,
51 .mask_flags = MTD_WRITEABLE
52 },{
53 .name = "jffs2",
54 .size = MTDPART_SIZ_FULL,
55 .offset = MTDPART_OFS_APPEND
56 }
57 };
58
59 #define NUM_PARTITIONS ARRAY_SIZE(h720x_partitions)
60
61 /*
62 * Initialize FLASH support
63 */
h720x_mtd_init(void)64 static int __init h720x_mtd_init(void)
65 {
66 h720x_map.virt = ioremap(h720x_map.phys, h720x_map.size);
67
68 if (!h720x_map.virt) {
69 printk(KERN_ERR "H720x-MTD: ioremap failed\n");
70 return -EIO;
71 }
72
73 simple_map_init(&h720x_map);
74
75 // Probe for flash bankwidth 4
76 printk (KERN_INFO "H720x-MTD probing 32bit FLASH\n");
77 mymtd = do_map_probe("cfi_probe", &h720x_map);
78 if (!mymtd) {
79 printk (KERN_INFO "H720x-MTD probing 16bit FLASH\n");
80 // Probe for bankwidth 2
81 h720x_map.bankwidth = 2;
82 mymtd = do_map_probe("cfi_probe", &h720x_map);
83 }
84
85 if (mymtd) {
86 mymtd->owner = THIS_MODULE;
87
88 mtd_device_parse_register(mymtd, NULL, 0,
89 h720x_partitions, NUM_PARTITIONS);
90 return 0;
91 }
92
93 iounmap((void *)h720x_map.virt);
94 return -ENXIO;
95 }
96
97 /*
98 * Cleanup
99 */
h720x_mtd_cleanup(void)100 static void __exit h720x_mtd_cleanup(void)
101 {
102
103 if (mymtd) {
104 mtd_device_unregister(mymtd);
105 map_destroy(mymtd);
106 }
107
108 if (h720x_map.virt) {
109 iounmap((void *)h720x_map.virt);
110 h720x_map.virt = 0;
111 }
112 }
113
114
115 module_init(h720x_mtd_init);
116 module_exit(h720x_mtd_cleanup);
117
118 MODULE_LICENSE("GPL");
119 MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>");
120 MODULE_DESCRIPTION("MTD map driver for Hynix evaluation boards");
121