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