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Commit | Line | Data |
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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 | ||
ed0b272e | 16 | #include <linux/err.h> |
1da177e4 LT |
17 | #include <linux/module.h> |
18 | #include <linux/types.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/string.h> | |
4e57b681 TS |
22 | #include <linux/slab.h> |
23 | #include <linux/ioport.h> | |
24 | #include <linux/device.h> | |
4fd5f826 | 25 | #include <linux/platform_device.h> |
4e57b681 | 26 | |
1da177e4 LT |
27 | #include <linux/mtd/mtd.h> |
28 | #include <linux/mtd/map.h> | |
29 | #include <linux/mtd/partitions.h> | |
4e57b681 | 30 | |
1da177e4 | 31 | #include <asm/io.h> |
1da177e4 LT |
32 | #include <asm/mach/flash.h> |
33 | ||
34 | #include <linux/reboot.h> | |
35 | ||
3c773547 JB |
36 | /* |
37 | * Read/write a 16 bit word from flash address 'addr'. | |
38 | * | |
39 | * When the cpu is in little-endian mode it swizzles the address lines | |
40 | * ('address coherency') so we need to undo the swizzling to ensure commands | |
41 | * and the like end up on the correct flash address. | |
42 | * | |
43 | * To further complicate matters, due to the way the expansion bus controller | |
44 | * handles 32 bit reads, the byte stream ABCD is stored on the flash as: | |
45 | * D15 D0 | |
46 | * +---+---+ | |
47 | * | A | B | 0 | |
48 | * +---+---+ | |
49 | * | C | D | 2 | |
50 | * +---+---+ | |
51 | * This means that on LE systems each 16 bit word must be swapped. Note that | |
52 | * this requires CONFIG_MTD_CFI_BE_BYTE_SWAP to be enabled to 'unswap' the CFI | |
53 | * data and other flash commands which are always in D7-D0. | |
54 | */ | |
1da177e4 | 55 | #ifndef __ARMEB__ |
3c773547 JB |
56 | #ifndef CONFIG_MTD_CFI_BE_BYTE_SWAP |
57 | # error CONFIG_MTD_CFI_BE_BYTE_SWAP required | |
58 | #endif | |
59 | ||
60 | static inline u16 flash_read16(void __iomem *addr) | |
61 | { | |
62 | return be16_to_cpu(__raw_readw((void __iomem *)((unsigned long)addr ^ 0x2))); | |
63 | } | |
64 | ||
65 | static inline void flash_write16(u16 d, void __iomem *addr) | |
66 | { | |
67 | __raw_writew(cpu_to_be16(d), (void __iomem *)((unsigned long)addr ^ 0x2)); | |
68 | } | |
69 | ||
1da177e4 LT |
70 | #define BYTE0(h) ((h) & 0xFF) |
71 | #define BYTE1(h) (((h) >> 8) & 0xFF) | |
3c773547 | 72 | |
1da177e4 | 73 | #else |
3c773547 JB |
74 | |
75 | static inline u16 flash_read16(const void __iomem *addr) | |
76 | { | |
77 | return __raw_readw(addr); | |
78 | } | |
79 | ||
80 | static inline void flash_write16(u16 d, void __iomem *addr) | |
81 | { | |
82 | __raw_writew(d, addr); | |
83 | } | |
84 | ||
1da177e4 LT |
85 | #define BYTE0(h) (((h) >> 8) & 0xFF) |
86 | #define BYTE1(h) ((h) & 0xFF) | |
87 | #endif | |
88 | ||
89 | static map_word ixp4xx_read16(struct map_info *map, unsigned long ofs) | |
90 | { | |
91 | map_word val; | |
3c773547 | 92 | val.x[0] = flash_read16(map->virt + ofs); |
1da177e4 LT |
93 | return val; |
94 | } | |
95 | ||
96 | /* | |
97 | * The IXP4xx expansion bus only allows 16-bit wide acceses | |
98 | * when attached to a 16-bit wide device (such as the 28F128J3A), | |
99 | * so we can't just memcpy_fromio(). | |
100 | */ | |
101 | static void ixp4xx_copy_from(struct map_info *map, void *to, | |
102 | unsigned long from, ssize_t len) | |
103 | { | |
1da177e4 | 104 | u8 *dest = (u8 *) to; |
9090ed0b | 105 | void __iomem *src = map->virt + from; |
1da177e4 | 106 | |
3c773547 JB |
107 | if (len <= 0) |
108 | return; | |
109 | ||
110 | if (from & 1) { | |
53f2b1c8 JR |
111 | *dest++ = BYTE1(flash_read16(src-1)); |
112 | src++; | |
3c773547 | 113 | --len; |
1da177e4 LT |
114 | } |
115 | ||
3c773547 JB |
116 | while (len >= 2) { |
117 | u16 data = flash_read16(src); | |
118 | *dest++ = BYTE0(data); | |
119 | *dest++ = BYTE1(data); | |
120 | src += 2; | |
121 | len -= 2; | |
68640c2a | 122 | } |
3c773547 JB |
123 | |
124 | if (len > 0) | |
125 | *dest++ = BYTE0(flash_read16(src)); | |
1da177e4 LT |
126 | } |
127 | ||
69f34c98 | 128 | /* |
1da177e4 LT |
129 | * Unaligned writes are ignored, causing the 8-bit |
130 | * probe to fail and proceed to the 16-bit probe (which succeeds). | |
131 | */ | |
132 | static void ixp4xx_probe_write16(struct map_info *map, map_word d, unsigned long adr) | |
133 | { | |
134 | if (!(adr & 1)) | |
3c773547 | 135 | flash_write16(d.x[0], map->virt + adr); |
1da177e4 LT |
136 | } |
137 | ||
69f34c98 | 138 | /* |
1da177e4 LT |
139 | * Fast write16 function without the probing check above |
140 | */ | |
141 | static void ixp4xx_write16(struct map_info *map, map_word d, unsigned long adr) | |
142 | { | |
3c773547 | 143 | flash_write16(d.x[0], map->virt + adr); |
1da177e4 LT |
144 | } |
145 | ||
146 | struct ixp4xx_flash_info { | |
147 | struct mtd_info *mtd; | |
148 | struct map_info map; | |
1da177e4 LT |
149 | struct resource *res; |
150 | }; | |
151 | ||
0984c891 | 152 | static const char * const probes[] = { "RedBoot", "cmdlinepart", NULL }; |
1da177e4 | 153 | |
3ae5eaec | 154 | static int ixp4xx_flash_remove(struct platform_device *dev) |
1da177e4 | 155 | { |
d20d5a57 | 156 | struct flash_platform_data *plat = dev_get_platdata(&dev->dev); |
3ae5eaec | 157 | struct ixp4xx_flash_info *info = platform_get_drvdata(dev); |
1da177e4 | 158 | |
1da177e4 LT |
159 | if(!info) |
160 | return 0; | |
161 | ||
1da177e4 | 162 | if (info->mtd) { |
6cbbf2ff | 163 | mtd_device_unregister(info->mtd); |
1da177e4 LT |
164 | map_destroy(info->mtd); |
165 | } | |
1da177e4 LT |
166 | |
167 | if (plat->exit) | |
168 | plat->exit(); | |
169 | ||
1da177e4 LT |
170 | return 0; |
171 | } | |
172 | ||
3ae5eaec | 173 | static int ixp4xx_flash_probe(struct platform_device *dev) |
1da177e4 | 174 | { |
d20d5a57 | 175 | struct flash_platform_data *plat = dev_get_platdata(&dev->dev); |
1da177e4 | 176 | struct ixp4xx_flash_info *info; |
a3c1e3b7 MKB |
177 | struct mtd_part_parser_data ppdata = { |
178 | .origin = dev->resource->start, | |
179 | }; | |
1da177e4 LT |
180 | int err = -1; |
181 | ||
182 | if (!plat) | |
183 | return -ENODEV; | |
184 | ||
185 | if (plat->init) { | |
186 | err = plat->init(); | |
187 | if (err) | |
188 | return err; | |
189 | } | |
190 | ||
ed0b272e JH |
191 | info = devm_kzalloc(&dev->dev, sizeof(struct ixp4xx_flash_info), |
192 | GFP_KERNEL); | |
1da177e4 LT |
193 | if(!info) { |
194 | err = -ENOMEM; | |
195 | goto Error; | |
69f34c98 | 196 | } |
1da177e4 | 197 | |
3ae5eaec | 198 | platform_set_drvdata(dev, info); |
1da177e4 | 199 | |
1da177e4 LT |
200 | /* |
201 | * Tell the MTD layer we're not 1:1 mapped so that it does | |
202 | * not attempt to do a direct access on us. | |
203 | */ | |
204 | info->map.phys = NO_XIP; | |
d6587fea | 205 | info->map.size = resource_size(dev->resource); |
1da177e4 LT |
206 | |
207 | /* | |
208 | * We only support 16-bit accesses for now. If and when | |
209 | * any board use 8-bit access, we'll fixup the driver to | |
210 | * handle that. | |
211 | */ | |
212 | info->map.bankwidth = 2; | |
475b44c1 | 213 | info->map.name = dev_name(&dev->dev); |
68640c2a RC |
214 | info->map.read = ixp4xx_read16; |
215 | info->map.write = ixp4xx_probe_write16; | |
216 | info->map.copy_from = ixp4xx_copy_from; | |
1da177e4 | 217 | |
ed0b272e JH |
218 | info->map.virt = devm_ioremap_resource(&dev->dev, dev->resource); |
219 | if (IS_ERR(info->map.virt)) { | |
220 | err = PTR_ERR(info->map.virt); | |
1da177e4 LT |
221 | goto Error; |
222 | } | |
223 | ||
224 | info->mtd = do_map_probe(plat->map_name, &info->map); | |
225 | if (!info->mtd) { | |
226 | printk(KERN_ERR "IXP4XXFlash: map_probe failed\n"); | |
227 | err = -ENXIO; | |
228 | goto Error; | |
229 | } | |
230 | info->mtd->owner = THIS_MODULE; | |
69f34c98 | 231 | |
1da177e4 | 232 | /* Use the fast version */ |
68640c2a RC |
233 | info->map.write = ixp4xx_write16; |
234 | ||
a3c1e3b7 | 235 | err = mtd_device_parse_register(info->mtd, probes, &ppdata, |
bc413f11 DES |
236 | plat->parts, plat->nr_parts); |
237 | if (err) { | |
6cbbf2ff | 238 | printk(KERN_ERR "Could not parse partitions\n"); |
1da177e4 | 239 | goto Error; |
bc413f11 | 240 | } |
1da177e4 LT |
241 | |
242 | return 0; | |
243 | ||
244 | Error: | |
3ae5eaec | 245 | ixp4xx_flash_remove(dev); |
1da177e4 LT |
246 | return err; |
247 | } | |
248 | ||
3ae5eaec | 249 | static struct platform_driver ixp4xx_flash_driver = { |
1da177e4 LT |
250 | .probe = ixp4xx_flash_probe, |
251 | .remove = ixp4xx_flash_remove, | |
3ae5eaec RK |
252 | .driver = { |
253 | .name = "IXP4XX-Flash", | |
41d867c9 | 254 | .owner = THIS_MODULE, |
3ae5eaec | 255 | }, |
1da177e4 LT |
256 | }; |
257 | ||
f99640de | 258 | module_platform_driver(ixp4xx_flash_driver); |
1da177e4 LT |
259 | |
260 | MODULE_LICENSE("GPL"); | |
82810a90 | 261 | MODULE_DESCRIPTION("MTD map driver for Intel IXP4xx systems"); |
1da177e4 | 262 | MODULE_AUTHOR("Deepak Saxena"); |
41d867c9 | 263 | MODULE_ALIAS("platform:IXP4XX-Flash"); |