1
2 /*
3 * drivers/mtd/maps/dmv182.c
4 *
5 * Flash map driver for the Dy4 SVME182 board
6 *
7 * $Id: dmv182.c,v 1.6 2005/11/07 11:14:26 gleixner Exp $
8 *
9 * Copyright 2003-2004, TimeSys Corporation
10 *
11 * Based on the SVME181 flash map, by Tom Nelson, Dot4, Inc. for TimeSys Corp.
12 *
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the
15 * Free Software Foundation; either version 2 of the License, or (at your
16 * option) any later version.
17 */
18
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/types.h>
22 #include <linux/kernel.h>
23 #include <asm/io.h>
24 #include <linux/mtd/mtd.h>
25 #include <linux/mtd/map.h>
26 #include <linux/mtd/partitions.h>
27 #include <linux/errno.h>
28
29 /*
30 * This driver currently handles only the 16MiB user flash bank 1 on the
31 * board. It does not provide access to bank 0 (contains the Dy4 FFW), bank 2
32 * (VxWorks boot), or the optional 48MiB expansion flash.
33 *
34 * scott.wood@timesys.com: On the newer boards with 128MiB flash, it
35 * now supports the first 96MiB (the boot flash bank containing FFW
36 * is excluded). The VxWorks loader is in partition 1.
37 */
38
39 #define FLASH_BASE_ADDR 0xf0000000
40 #define FLASH_BANK_SIZE (128*1024*1024)
41
42 MODULE_AUTHOR("Scott Wood, TimeSys Corporation <scott.wood@timesys.com>");
43 MODULE_DESCRIPTION("User-programmable flash device on the Dy4 SVME182 board");
44 MODULE_LICENSE("GPL");
45
46 static struct map_info svme182_map = {
47 .name = "Dy4 SVME182",
48 .bankwidth = 32,
49 .size = 128 * 1024 * 1024
50 };
51
52 #define BOOTIMAGE_PART_SIZE ((6*1024*1024)-RESERVED_PART_SIZE)
53
54 // Allow 6MiB for the kernel
55 #define NEW_BOOTIMAGE_PART_SIZE (6 * 1024 * 1024)
56 // Allow 1MiB for the bootloader
57 #define NEW_BOOTLOADER_PART_SIZE (1024 * 1024)
58 // Use the remaining 9MiB at the end of flash for the RFS
59 #define NEW_RFS_PART_SIZE (0x01000000 - NEW_BOOTLOADER_PART_SIZE - \
60 NEW_BOOTIMAGE_PART_SIZE)
61
62 static struct mtd_partition svme182_partitions[] = {
63 // The Lower PABS is only 128KiB, but the partition code doesn't
64 // like partitions that don't end on the largest erase block
65 // size of the device, even if all of the erase blocks in the
66 // partition are small ones. The hardware should prevent
67 // writes to the actual PABS areas.
68 {
69 name: "Lower PABS and CPU 0 bootloader or kernel",
70 size: 6*1024*1024,
71 offset: 0,
72 },
73 {
74 name: "Root Filesystem",
75 size: 10*1024*1024,
76 offset: MTDPART_OFS_NXTBLK
77 },
78 {
79 name: "CPU1 Bootloader",
80 size: 1024*1024,
81 offset: MTDPART_OFS_NXTBLK,
82 },
83 {
84 name: "Extra",
85 size: 110*1024*1024,
86 offset: MTDPART_OFS_NXTBLK
87 },
88 {
89 name: "Foundation Firmware and Upper PABS",
90 size: 1024*1024,
91 offset: MTDPART_OFS_NXTBLK,
92 mask_flags: MTD_WRITEABLE // read-only
93 }
94 };
95
96 static struct mtd_info *this_mtd;
97
98 static int __init init_svme182(void)
99 {
100 struct mtd_partition *partitions;
101 int num_parts = ARRAY_SIZE(svme182_partitions);
102
103 partitions = svme182_partitions;
104
105 svme182_map.virt = ioremap(FLASH_BASE_ADDR, svme182_map.size);
106
107 if (svme182_map.virt == 0) {
108 printk("Failed to ioremap FLASH memory area.\n");
109 return -EIO;
110 }
111
112 simple_map_init(&svme182_map);
113
114 this_mtd = do_map_probe("cfi_probe", &svme182_map);
115 if (!this_mtd)
116 {
117 iounmap((void *)svme182_map.virt);
118 return -ENXIO;
119 }
120
121 printk(KERN_NOTICE "SVME182 flash device: %dMiB at 0x%08x\n",
122 this_mtd->size >> 20, FLASH_BASE_ADDR);
123
124 this_mtd->owner = THIS_MODULE;
125 add_mtd_partitions(this_mtd, partitions, num_parts);
126
127 return 0;
128 }
129
130 static void __exit cleanup_svme182(void)
131 {
132 if (this_mtd)
133 {
134 del_mtd_partitions(this_mtd);
135 map_destroy(this_mtd);
136 }
137
138 if (svme182_map.virt)
139 {
140 iounmap((void *)svme182_map.virt);
141 svme182_map.virt = 0;
142 }
143
144 return;
145 }
146
147 module_init(init_svme182);
148 module_exit(cleanup_svme182);
149
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