Linux Kernel  3.7.1
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flash.c
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1 /*
2  * Favr-32 board-specific flash initialization
3  *
4  * Copyright (C) 2008 Atmel Corporation
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10 #include <linux/init.h>
11 #include <linux/platform_device.h>
12 #include <linux/mtd/mtd.h>
13 #include <linux/mtd/partitions.h>
14 #include <linux/mtd/physmap.h>
15 
16 #include <mach/smc.h>
17 
18 static struct smc_timing flash_timing __initdata = {
19  .ncs_read_setup = 0,
20  .nrd_setup = 40,
21  .ncs_write_setup = 0,
22  .nwe_setup = 10,
23 
24  .ncs_read_pulse = 80,
25  .nrd_pulse = 40,
26  .ncs_write_pulse = 65,
27  .nwe_pulse = 55,
28 
29  .read_cycle = 120,
30  .write_cycle = 120,
31 };
32 
33 static struct smc_config flash_config __initdata = {
34  .bus_width = 2,
35  .nrd_controlled = 1,
36  .nwe_controlled = 1,
37  .byte_write = 1,
38 };
39 
40 static struct mtd_partition flash_parts[] = {
41  {
42  .name = "u-boot",
43  .offset = 0x00000000,
44  .size = 0x00020000, /* 128 KiB */
45  .mask_flags = MTD_WRITEABLE,
46  },
47  {
48  .name = "root",
49  .offset = 0x00020000,
50  .size = 0x007d0000,
51  },
52  {
53  .name = "env",
54  .offset = 0x007f0000,
55  .size = 0x00010000,
56  .mask_flags = MTD_WRITEABLE,
57  },
58 };
59 
60 static struct physmap_flash_data flash_data = {
61  .width = 2,
62  .nr_parts = ARRAY_SIZE(flash_parts),
63  .parts = flash_parts,
64 };
65 
66 static struct resource flash_resource = {
67  .start = 0x00000000,
68  .end = 0x007fffff,
69  .flags = IORESOURCE_MEM,
70 };
71 
72 static struct platform_device flash_device = {
73  .name = "physmap-flash",
74  .id = 0,
75  .resource = &flash_resource,
76  .num_resources = 1,
77  .dev = {
78  .platform_data = &flash_data,
79  },
80 };
81 
82 /* This needs to be called after the SMC has been initialized */
83 static int __init favr32_flash_init(void)
84 {
85  int ret;
86 
87  smc_set_timing(&flash_config, &flash_timing);
88  ret = smc_set_configuration(0, &flash_config);
89  if (ret < 0) {
90  printk(KERN_ERR "Favr-32: failed to set NOR flash timing\n");
91  return ret;
92  }
93 
94  platform_device_register(&flash_device);
95 
96  return 0;
97 }
98 device_initcall(favr32_flash_init);