Root/target/linux/amazon/files/drivers/mtd/maps/amazon.c

1/*
2 * Handle mapping of the flash memory access routines
3 * on Amazon based devices.
4 *
5 * Copyright(C) 2004 peng.liu@infineon.com
6 *
7 * This code is GPLed
8 *
9 */
10// 000005:fchang 2005/6/2 Modified by Bingtao to double check if the EBU is enabled/disabled
11// 506231:tc.chen 2005/06/23 increase firmware partition size form 192KB to 256KB
12// 050701:linmars 2005/07/01 fix flash size wrong alignment after increase firmware partition
13// 165001:henryhsu 2005/8/18 Remove the support for Intel flash because of 2.1 not enough rootfs partition size
14// 165001:henryhsu 2005/9/7 Rolback to support INtel flash
15// 509071:tc.chen 2005/09/07 Reduced flash writing time
16// 511046:linmars 2005/11/04 change bootloader size from 128 into 64
17// 511241:linmars 2005/11/24 merge TaiChen's IRM patch
18
19// copyright 2005 infineon
20
21// copyright 2007 john crispin <blogic@openwrt.org>
22// copyright 2007 felix fietkau <nbd@openwrt.org>
23// copyright 2009 hauke mehrtens <hauke@hauke-m.de>
24
25#include <linux/module.h>
26#include <linux/types.h>
27#include <linux/kernel.h>
28#include <asm/io.h>
29
30#include <linux/init.h>
31#include <linux/mtd/mtd.h>
32#include <linux/mtd/map.h>
33#include <linux/mtd/partitions.h>
34#include <linux/mtd/cfi.h>
35#include <linux/mutex.h>
36#include <linux/platform_device.h>
37#include <asm/amazon/amazon.h>
38
39#define AMAZON_PCI_ARB_CTL_ALT 0xb100205c
40#define AMAZON_MTD_REG32( addr ) (*(volatile u32 *)(addr))
41
42
43static struct map_info amazon_map = {
44    .name = "AMAZON_FLASH",
45    .bankwidth = 2,
46};
47
48static map_word amazon_read16(struct map_info * map, unsigned long ofs)
49{
50    map_word temp;
51    ofs ^= 2;
52    temp.x[0] = *((__u16 *) (map->virt + ofs));
53    return temp;
54}
55
56static void amazon_write16(struct map_info *map, map_word d, unsigned long adr)
57{
58    adr ^= 2;
59    *((__u16 *) (map->virt + adr)) = d.x[0];
60}
61
62void amazon_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
63{
64    u8 *p;
65    u8 *to_8;
66    from = (unsigned long) (from + map->virt);
67    p = (u8 *) from;
68    to_8 = (u8 *) to;
69    while(len--){
70        *to_8++ = *p++;
71    }
72}
73
74void amazon_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
75{
76    u8 *p = (u8*) from;
77    u8 *to_8;
78    to += (unsigned long) map->virt;
79    to_8 = (u8*)to;
80    while(len--){
81        *p++ = *to_8++;
82    }
83}
84
85#define UBOOT_SIZE 0x40000
86
87static struct mtd_partition amazon_partitions[3] = {
88     {
89          name:"U-Boot", /* U-Boot firmware */
90          offset:0x00000000,
91          size:UBOOT_SIZE , /* 128k */
92      },
93     {
94          name:"kernel", /* firmware */
95          offset:UBOOT_SIZE,
96          size:0x00100000, /* 192K */
97      },
98     {
99          name:"rootfs", /* default partition */
100          offset:0x00200000,
101          size:0x00200000,
102      },
103};
104
105unsigned long uImage_size = 0x10000d;
106
107int find_uImage_size(unsigned long start_offset)
108{
109    unsigned long magic;
110    unsigned long temp;
111    amazon_copy_from(&amazon_map, &magic, start_offset, 4);
112    if (!(ntohl(magic) == 0x27051956)) {
113        printk(KERN_INFO "amazon_mtd: invalid magic (0x%08X) of kernel at 0x%08lx \n", ntohl(magic), start_offset);
114        return 0;
115    }
116    amazon_copy_from(&amazon_map, &temp, start_offset + 12, 4);
117    printk(KERN_INFO "amazon_mtd: kernel size is %ld \n", temp + 0x40);
118    return temp + 0x40;
119}
120
121static int amazon_mtd_probe(struct platform_device *dev)
122{
123    unsigned long uimage_size;
124    struct mtd_info *mymtd = NULL;
125    struct mtd_partition *parts = NULL;
126
127    *AMAZON_EBU_BUSCON0 = 0x1d7ff;
128    
129    amazon_map.read = amazon_read16;
130    amazon_map.write = amazon_write16;
131    amazon_map.copy_from = amazon_copy_from;
132    amazon_map.copy_to = amazon_copy_to;
133
134    amazon_map.phys = dev->resource->start;
135    amazon_map.size = dev->resource->end - amazon_map.phys + 1;
136    amazon_map.virt = ioremap_nocache(amazon_map.phys, amazon_map.size);
137    
138    if (!amazon_map.virt) {
139        printk(KERN_WARNING "amazon_mtd: Failed to ioremap!\n");
140        return -EIO;
141    }
142    
143    mymtd = (struct mtd_info *) do_map_probe("cfi_probe", &amazon_map);
144    if (!mymtd) {
145        iounmap(amazon_map.virt);
146        printk(KERN_WARNING "amazon_mtd: probing failed\n");
147        return -ENXIO;
148    }
149
150    mymtd->owner = THIS_MODULE;
151    parts = &amazon_partitions[0];
152
153    /* Some Samsung devices are containing a 16 MB flash chip with a bigger U-Boot partition. */
154    if(mymtd->size == 0x01000000 && mymtd->erasesize == 0x00020000) {
155        printk(KERN_INFO "amazon_mtd: Found big flash chip!\n");
156        amazon_partitions[0].size = 0x60000;
157        amazon_partitions[1].offset = 0x60000;
158        uimage_size = find_uImage_size(amazon_partitions[1].offset);
159        amazon_partitions[1].size = uimage_size;
160        amazon_partitions[2].offset = 0x60000 + uimage_size;
161        amazon_partitions[2].size = mymtd->size - amazon_partitions[2].offset - mymtd->erasesize;
162    } else {
163        printk(KERN_INFO "amazon_mtd: Found small flash chip!\n");
164        uimage_size = find_uImage_size(amazon_partitions[1].offset);
165        amazon_partitions[1].size = uimage_size;
166        amazon_partitions[2].offset = UBOOT_SIZE + uimage_size;
167        amazon_partitions[2].size = mymtd->size - amazon_partitions[2].offset - (2 * mymtd->erasesize);
168    }
169
170    mtd_device_register(mymtd, parts, 3);
171
172    printk(KERN_INFO "amazon_mtd: added %s flash with %dMB\n",
173        amazon_map.name, ((int)mymtd->size) >> 20);
174    return 0;
175}
176
177static struct platform_driver amazon_mtd_driver = {
178    .probe = amazon_mtd_probe,
179    .driver = {
180        .name = "amazon_mtd",
181        .owner = THIS_MODULE,
182    },
183};
184
185static int __init amazon_mtd_init(void)
186{
187    int ret = platform_driver_register(&amazon_mtd_driver);
188    if (ret)
189        printk(KERN_WARNING "amazon_mtd: error registering platfom driver!\n");
190    return ret;
191}
192
193static void __exit amazon_mtd_cleanup(void)
194{
195    platform_driver_unregister(&amazon_mtd_driver);
196}
197
198module_init(amazon_mtd_init);
199module_exit(amazon_mtd_cleanup);
200
201MODULE_LICENSE("GPL");
202MODULE_AUTHOR("john crispin blogic@openwrt.org");
203MODULE_DESCRIPTION("MTD map driver for AMAZON boards");
204
205

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