Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * drivers/mtd/maps/ixp4xx.c |
3 | * | |
4 | * MTD Map file for IXP4XX based systems. Please do not make per-board | |
5 | * changes in here. If your board needs special setup, do it in your | |
6 | * platform level code in arch/arm/mach-ixp4xx/board-setup.c | |
7 | * | |
8 | * Original Author: Intel Corporation | |
9 | * Maintainer: Deepak Saxena <dsaxena@mvista.com> | |
10 | * | |
11 | * Copyright (C) 2002 Intel Corporation | |
12 | * Copyright (C) 2003-2004 MontaVista Software, Inc. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/types.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/string.h> | |
4e57b681 TS |
21 | #include <linux/slab.h> |
22 | #include <linux/ioport.h> | |
23 | #include <linux/device.h> | |
4fd5f826 | 24 | #include <linux/platform_device.h> |
4e57b681 | 25 | |
1da177e4 LT |
26 | #include <linux/mtd/mtd.h> |
27 | #include <linux/mtd/map.h> | |
28 | #include <linux/mtd/partitions.h> | |
4e57b681 | 29 | |
1da177e4 | 30 | #include <asm/io.h> |
1da177e4 LT |
31 | #include <asm/mach/flash.h> |
32 | ||
33 | #include <linux/reboot.h> | |
34 | ||
3c773547 JB |
35 | /* |
36 | * Read/write a 16 bit word from flash address 'addr'. | |
37 | * | |
38 | * When the cpu is in little-endian mode it swizzles the address lines | |
39 | * ('address coherency') so we need to undo the swizzling to ensure commands | |
40 | * and the like end up on the correct flash address. | |
41 | * | |
42 | * To further complicate matters, due to the way the expansion bus controller | |
43 | * handles 32 bit reads, the byte stream ABCD is stored on the flash as: | |
44 | * D15 D0 | |
45 | * +---+---+ | |
46 | * | A | B | 0 | |
47 | * +---+---+ | |
48 | * | C | D | 2 | |
49 | * +---+---+ | |
50 | * This means that on LE systems each 16 bit word must be swapped. Note that | |
51 | * this requires CONFIG_MTD_CFI_BE_BYTE_SWAP to be enabled to 'unswap' the CFI | |
52 | * data and other flash commands which are always in D7-D0. | |
53 | */ | |
1da177e4 | 54 | #ifndef __ARMEB__ |
3c773547 JB |
55 | #ifndef CONFIG_MTD_CFI_BE_BYTE_SWAP |
56 | # error CONFIG_MTD_CFI_BE_BYTE_SWAP required | |
57 | #endif | |
58 | ||
59 | static inline u16 flash_read16(void __iomem *addr) | |
60 | { | |
61 | return be16_to_cpu(__raw_readw((void __iomem *)((unsigned long)addr ^ 0x2))); | |
62 | } | |
63 | ||
64 | static inline void flash_write16(u16 d, void __iomem *addr) | |
65 | { | |
66 | __raw_writew(cpu_to_be16(d), (void __iomem *)((unsigned long)addr ^ 0x2)); | |
67 | } | |
68 | ||
1da177e4 LT |
69 | #define BYTE0(h) ((h) & 0xFF) |
70 | #define BYTE1(h) (((h) >> 8) & 0xFF) | |
3c773547 | 71 | |
1da177e4 | 72 | #else |
3c773547 JB |
73 | |
74 | static inline u16 flash_read16(const void __iomem *addr) | |
75 | { | |
76 | return __raw_readw(addr); | |
77 | } | |
78 | ||
79 | static inline void flash_write16(u16 d, void __iomem *addr) | |
80 | { | |
81 | __raw_writew(d, addr); | |
82 | } | |
83 | ||
1da177e4 LT |
84 | #define BYTE0(h) (((h) >> 8) & 0xFF) |
85 | #define BYTE1(h) ((h) & 0xFF) | |
86 | #endif | |
87 | ||
88 | static map_word ixp4xx_read16(struct map_info *map, unsigned long ofs) | |
89 | { | |
90 | map_word val; | |
3c773547 | 91 | val.x[0] = flash_read16(map->virt + ofs); |
1da177e4 LT |
92 | return val; |
93 | } | |
94 | ||
95 | /* | |
96 | * The IXP4xx expansion bus only allows 16-bit wide acceses | |
97 | * when attached to a 16-bit wide device (such as the 28F128J3A), | |
98 | * so we can't just memcpy_fromio(). | |
99 | */ | |
100 | static void ixp4xx_copy_from(struct map_info *map, void *to, | |
101 | unsigned long from, ssize_t len) | |
102 | { | |
1da177e4 | 103 | u8 *dest = (u8 *) to; |
9090ed0b | 104 | void __iomem *src = map->virt + from; |
1da177e4 | 105 | |
3c773547 JB |
106 | if (len <= 0) |
107 | return; | |
108 | ||
109 | if (from & 1) { | |
53f2b1c8 JR |
110 | *dest++ = BYTE1(flash_read16(src-1)); |
111 | src++; | |
3c773547 | 112 | --len; |
1da177e4 LT |
113 | } |
114 | ||
3c773547 JB |
115 | while (len >= 2) { |
116 | u16 data = flash_read16(src); | |
117 | *dest++ = BYTE0(data); | |
118 | *dest++ = BYTE1(data); | |
119 | src += 2; | |
120 | len -= 2; | |
68640c2a | 121 | } |
3c773547 JB |
122 | |
123 | if (len > 0) | |
124 | *dest++ = BYTE0(flash_read16(src)); | |
1da177e4 LT |
125 | } |
126 | ||
69f34c98 | 127 | /* |
1da177e4 LT |
128 | * Unaligned writes are ignored, causing the 8-bit |
129 | * probe to fail and proceed to the 16-bit probe (which succeeds). | |
130 | */ | |
131 | static void ixp4xx_probe_write16(struct map_info *map, map_word d, unsigned long adr) | |
132 | { | |
133 | if (!(adr & 1)) | |
3c773547 | 134 | flash_write16(d.x[0], map->virt + adr); |
1da177e4 LT |
135 | } |
136 | ||
69f34c98 | 137 | /* |
1da177e4 LT |
138 | * Fast write16 function without the probing check above |
139 | */ | |
140 | static void ixp4xx_write16(struct map_info *map, map_word d, unsigned long adr) | |
141 | { | |
3c773547 | 142 | flash_write16(d.x[0], map->virt + adr); |
1da177e4 LT |
143 | } |
144 | ||
145 | struct ixp4xx_flash_info { | |
146 | struct mtd_info *mtd; | |
147 | struct map_info map; | |
1da177e4 LT |
148 | struct resource *res; |
149 | }; | |
150 | ||
151 | static const char *probes[] = { "RedBoot", "cmdlinepart", NULL }; | |
152 | ||
3ae5eaec | 153 | static int ixp4xx_flash_remove(struct platform_device *dev) |
1da177e4 | 154 | { |
1da177e4 | 155 | struct flash_platform_data *plat = dev->dev.platform_data; |
3ae5eaec | 156 | struct ixp4xx_flash_info *info = platform_get_drvdata(dev); |
1da177e4 | 157 | |
3ae5eaec | 158 | platform_set_drvdata(dev, NULL); |
1da177e4 LT |
159 | |
160 | if(!info) | |
161 | return 0; | |
162 | ||
1da177e4 | 163 | if (info->mtd) { |
6cbbf2ff | 164 | mtd_device_unregister(info->mtd); |
1da177e4 LT |
165 | map_destroy(info->mtd); |
166 | } | |
9090ed0b DV |
167 | if (info->map.virt) |
168 | iounmap(info->map.virt); | |
1da177e4 | 169 | |
1da177e4 LT |
170 | if (info->res) { |
171 | release_resource(info->res); | |
172 | kfree(info->res); | |
173 | } | |
174 | ||
175 | if (plat->exit) | |
176 | plat->exit(); | |
177 | ||
1da177e4 LT |
178 | return 0; |
179 | } | |
180 | ||
3ae5eaec | 181 | static int ixp4xx_flash_probe(struct platform_device *dev) |
1da177e4 | 182 | { |
1da177e4 LT |
183 | struct flash_platform_data *plat = dev->dev.platform_data; |
184 | struct ixp4xx_flash_info *info; | |
a3c1e3b7 MKB |
185 | struct mtd_part_parser_data ppdata = { |
186 | .origin = dev->resource->start, | |
187 | }; | |
1da177e4 LT |
188 | int err = -1; |
189 | ||
190 | if (!plat) | |
191 | return -ENODEV; | |
192 | ||
193 | if (plat->init) { | |
194 | err = plat->init(); | |
195 | if (err) | |
196 | return err; | |
197 | } | |
198 | ||
2bfefa4c | 199 | info = kzalloc(sizeof(struct ixp4xx_flash_info), GFP_KERNEL); |
1da177e4 LT |
200 | if(!info) { |
201 | err = -ENOMEM; | |
202 | goto Error; | |
69f34c98 | 203 | } |
1da177e4 | 204 | |
3ae5eaec | 205 | platform_set_drvdata(dev, info); |
1da177e4 | 206 | |
1da177e4 LT |
207 | /* |
208 | * Tell the MTD layer we're not 1:1 mapped so that it does | |
209 | * not attempt to do a direct access on us. | |
210 | */ | |
211 | info->map.phys = NO_XIP; | |
d6587fea | 212 | info->map.size = resource_size(dev->resource); |
1da177e4 LT |
213 | |
214 | /* | |
215 | * We only support 16-bit accesses for now. If and when | |
216 | * any board use 8-bit access, we'll fixup the driver to | |
217 | * handle that. | |
218 | */ | |
219 | info->map.bankwidth = 2; | |
475b44c1 | 220 | info->map.name = dev_name(&dev->dev); |
68640c2a RC |
221 | info->map.read = ixp4xx_read16; |
222 | info->map.write = ixp4xx_probe_write16; | |
223 | info->map.copy_from = ixp4xx_copy_from; | |
1da177e4 | 224 | |
69f34c98 | 225 | info->res = request_mem_region(dev->resource->start, |
d6587fea | 226 | resource_size(dev->resource), |
1da177e4 LT |
227 | "IXP4XXFlash"); |
228 | if (!info->res) { | |
229 | printk(KERN_ERR "IXP4XXFlash: Could not reserve memory region\n"); | |
230 | err = -ENOMEM; | |
231 | goto Error; | |
232 | } | |
233 | ||
9090ed0b | 234 | info->map.virt = ioremap(dev->resource->start, |
d6587fea | 235 | resource_size(dev->resource)); |
9090ed0b | 236 | if (!info->map.virt) { |
1da177e4 LT |
237 | printk(KERN_ERR "IXP4XXFlash: Failed to ioremap region\n"); |
238 | err = -EIO; | |
239 | goto Error; | |
240 | } | |
241 | ||
242 | info->mtd = do_map_probe(plat->map_name, &info->map); | |
243 | if (!info->mtd) { | |
244 | printk(KERN_ERR "IXP4XXFlash: map_probe failed\n"); | |
245 | err = -ENXIO; | |
246 | goto Error; | |
247 | } | |
248 | info->mtd->owner = THIS_MODULE; | |
69f34c98 | 249 | |
1da177e4 | 250 | /* Use the fast version */ |
68640c2a RC |
251 | info->map.write = ixp4xx_write16; |
252 | ||
a3c1e3b7 | 253 | err = mtd_device_parse_register(info->mtd, probes, &ppdata, |
bc413f11 DES |
254 | plat->parts, plat->nr_parts); |
255 | if (err) { | |
6cbbf2ff | 256 | printk(KERN_ERR "Could not parse partitions\n"); |
1da177e4 | 257 | goto Error; |
bc413f11 | 258 | } |
1da177e4 LT |
259 | |
260 | return 0; | |
261 | ||
262 | Error: | |
3ae5eaec | 263 | ixp4xx_flash_remove(dev); |
1da177e4 LT |
264 | return err; |
265 | } | |
266 | ||
3ae5eaec | 267 | static struct platform_driver ixp4xx_flash_driver = { |
1da177e4 LT |
268 | .probe = ixp4xx_flash_probe, |
269 | .remove = ixp4xx_flash_remove, | |
3ae5eaec RK |
270 | .driver = { |
271 | .name = "IXP4XX-Flash", | |
41d867c9 | 272 | .owner = THIS_MODULE, |
3ae5eaec | 273 | }, |
1da177e4 LT |
274 | }; |
275 | ||
f99640de | 276 | module_platform_driver(ixp4xx_flash_driver); |
1da177e4 LT |
277 | |
278 | MODULE_LICENSE("GPL"); | |
82810a90 | 279 | MODULE_DESCRIPTION("MTD map driver for Intel IXP4xx systems"); |
1da177e4 | 280 | MODULE_AUTHOR("Deepak Saxena"); |
41d867c9 | 281 | MODULE_ALIAS("platform:IXP4XX-Flash"); |