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3c544739 JC |
1 | /* |
2 | * This program is free software; you can redistribute it and/or modify it | |
3 | * under the terms of the GNU General Public License version 2 as published | |
4 | * by the Free Software Foundation. | |
5 | * | |
6 | * Copyright (C) 2004 Liu Peng Infineon IFAP DC COM CPE | |
7 | * Copyright (C) 2010 John Crispin <blogic@openwrt.org> | |
8 | */ | |
9 | ||
b0de774c | 10 | #include <linux/err.h> |
3c544739 JC |
11 | #include <linux/module.h> |
12 | #include <linux/types.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/io.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/mtd/mtd.h> | |
18 | #include <linux/mtd/map.h> | |
19 | #include <linux/mtd/partitions.h> | |
20 | #include <linux/mtd/cfi.h> | |
21 | #include <linux/platform_device.h> | |
22 | #include <linux/mtd/physmap.h> | |
fa09eded | 23 | #include <linux/of.h> |
3c544739 JC |
24 | |
25 | #include <lantiq_soc.h> | |
3c544739 JC |
26 | |
27 | /* | |
28 | * The NOR flash is connected to the same external bus unit (EBU) as PCI. | |
29 | * To make PCI work we need to enable the endianness swapping for the address | |
30 | * written to the EBU. This endianness swapping works for PCI correctly but | |
31 | * fails for attached NOR devices. To workaround this we need to use a complex | |
32 | * map. The workaround involves swapping all addresses whilst probing the chip. | |
33 | * Once probing is complete we stop swapping the addresses but swizzle the | |
34 | * unlock addresses to ensure that access to the NOR device works correctly. | |
35 | */ | |
36 | ||
37 | enum { | |
38 | LTQ_NOR_PROBING, | |
39 | LTQ_NOR_NORMAL | |
40 | }; | |
41 | ||
42 | struct ltq_mtd { | |
43 | struct resource *res; | |
44 | struct mtd_info *mtd; | |
45 | struct map_info *map; | |
46 | }; | |
47 | ||
02fa961f | 48 | static const char ltq_map_name[] = "ltq_nor"; |
0984c891 | 49 | static const char * const ltq_probe_types[] = { "cmdlinepart", "ofpart", NULL }; |
3c544739 JC |
50 | |
51 | static map_word | |
52 | ltq_read16(struct map_info *map, unsigned long adr) | |
53 | { | |
54 | unsigned long flags; | |
55 | map_word temp; | |
56 | ||
57 | if (map->map_priv_1 == LTQ_NOR_PROBING) | |
58 | adr ^= 2; | |
59 | spin_lock_irqsave(&ebu_lock, flags); | |
60 | temp.x[0] = *(u16 *)(map->virt + adr); | |
61 | spin_unlock_irqrestore(&ebu_lock, flags); | |
62 | return temp; | |
63 | } | |
64 | ||
65 | static void | |
66 | ltq_write16(struct map_info *map, map_word d, unsigned long adr) | |
67 | { | |
68 | unsigned long flags; | |
69 | ||
70 | if (map->map_priv_1 == LTQ_NOR_PROBING) | |
71 | adr ^= 2; | |
72 | spin_lock_irqsave(&ebu_lock, flags); | |
73 | *(u16 *)(map->virt + adr) = d.x[0]; | |
74 | spin_unlock_irqrestore(&ebu_lock, flags); | |
75 | } | |
76 | ||
77 | /* | |
78 | * The following 2 functions copy data between iomem and a cached memory | |
79 | * section. As memcpy() makes use of pre-fetching we cannot use it here. | |
80 | * The normal alternative of using memcpy_{to,from}io also makes use of | |
81 | * memcpy() on MIPS so it is not applicable either. We are therefore stuck | |
82 | * with having to use our own loop. | |
83 | */ | |
84 | static void | |
85 | ltq_copy_from(struct map_info *map, void *to, | |
86 | unsigned long from, ssize_t len) | |
87 | { | |
88 | unsigned char *f = (unsigned char *)map->virt + from; | |
89 | unsigned char *t = (unsigned char *)to; | |
90 | unsigned long flags; | |
91 | ||
92 | spin_lock_irqsave(&ebu_lock, flags); | |
93 | while (len--) | |
94 | *t++ = *f++; | |
95 | spin_unlock_irqrestore(&ebu_lock, flags); | |
96 | } | |
97 | ||
98 | static void | |
99 | ltq_copy_to(struct map_info *map, unsigned long to, | |
100 | const void *from, ssize_t len) | |
101 | { | |
102 | unsigned char *f = (unsigned char *)from; | |
103 | unsigned char *t = (unsigned char *)map->virt + to; | |
104 | unsigned long flags; | |
105 | ||
106 | spin_lock_irqsave(&ebu_lock, flags); | |
107 | while (len--) | |
108 | *t++ = *f++; | |
109 | spin_unlock_irqrestore(&ebu_lock, flags); | |
110 | } | |
111 | ||
06f25510 | 112 | static int |
3c544739 JC |
113 | ltq_mtd_probe(struct platform_device *pdev) |
114 | { | |
02fa961f | 115 | struct mtd_part_parser_data ppdata; |
3c544739 | 116 | struct ltq_mtd *ltq_mtd; |
3c544739 JC |
117 | struct cfi_private *cfi; |
118 | int err; | |
119 | ||
fa09eded JC |
120 | if (of_machine_is_compatible("lantiq,falcon") && |
121 | (ltq_boot_select() != BS_FLASH)) { | |
122 | dev_err(&pdev->dev, "invalid bootstrap options\n"); | |
123 | return -ENODEV; | |
124 | } | |
125 | ||
3c544739 JC |
126 | ltq_mtd = kzalloc(sizeof(struct ltq_mtd), GFP_KERNEL); |
127 | platform_set_drvdata(pdev, ltq_mtd); | |
128 | ||
129 | ltq_mtd->res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
130 | if (!ltq_mtd->res) { | |
02fa961f | 131 | dev_err(&pdev->dev, "failed to get memory resource\n"); |
3c544739 JC |
132 | err = -ENOENT; |
133 | goto err_out; | |
134 | } | |
135 | ||
3c544739 | 136 | ltq_mtd->map = kzalloc(sizeof(struct map_info), GFP_KERNEL); |
02fa961f JC |
137 | ltq_mtd->map->phys = ltq_mtd->res->start; |
138 | ltq_mtd->map->size = resource_size(ltq_mtd->res); | |
b0de774c TR |
139 | ltq_mtd->map->virt = devm_ioremap_resource(&pdev->dev, ltq_mtd->res); |
140 | if (IS_ERR(ltq_mtd->map->virt)) { | |
141 | err = PTR_ERR(ltq_mtd->map->virt); | |
02fa961f | 142 | goto err_out; |
3c544739 JC |
143 | } |
144 | ||
145 | ltq_mtd->map->name = ltq_map_name; | |
146 | ltq_mtd->map->bankwidth = 2; | |
147 | ltq_mtd->map->read = ltq_read16; | |
148 | ltq_mtd->map->write = ltq_write16; | |
149 | ltq_mtd->map->copy_from = ltq_copy_from; | |
150 | ltq_mtd->map->copy_to = ltq_copy_to; | |
151 | ||
152 | ltq_mtd->map->map_priv_1 = LTQ_NOR_PROBING; | |
153 | ltq_mtd->mtd = do_map_probe("cfi_probe", ltq_mtd->map); | |
154 | ltq_mtd->map->map_priv_1 = LTQ_NOR_NORMAL; | |
155 | ||
156 | if (!ltq_mtd->mtd) { | |
157 | dev_err(&pdev->dev, "probing failed\n"); | |
158 | err = -ENXIO; | |
af32b360 | 159 | goto err_free; |
3c544739 JC |
160 | } |
161 | ||
162 | ltq_mtd->mtd->owner = THIS_MODULE; | |
163 | ||
164 | cfi = ltq_mtd->map->fldrv_priv; | |
165 | cfi->addr_unlock1 ^= 1; | |
166 | cfi->addr_unlock2 ^= 1; | |
167 | ||
02fa961f JC |
168 | ppdata.of_node = pdev->dev.of_node; |
169 | err = mtd_device_parse_register(ltq_mtd->mtd, ltq_probe_types, | |
170 | &ppdata, NULL, 0); | |
3c544739 JC |
171 | if (err) { |
172 | dev_err(&pdev->dev, "failed to add partitions\n"); | |
173 | goto err_destroy; | |
174 | } | |
175 | ||
176 | return 0; | |
177 | ||
178 | err_destroy: | |
179 | map_destroy(ltq_mtd->mtd); | |
3c544739 JC |
180 | err_free: |
181 | kfree(ltq_mtd->map); | |
182 | err_out: | |
183 | kfree(ltq_mtd); | |
184 | return err; | |
185 | } | |
186 | ||
810b7e06 | 187 | static int |
3c544739 JC |
188 | ltq_mtd_remove(struct platform_device *pdev) |
189 | { | |
190 | struct ltq_mtd *ltq_mtd = platform_get_drvdata(pdev); | |
191 | ||
192 | if (ltq_mtd) { | |
193 | if (ltq_mtd->mtd) { | |
2e5db86d | 194 | mtd_device_unregister(ltq_mtd->mtd); |
3c544739 JC |
195 | map_destroy(ltq_mtd->mtd); |
196 | } | |
3c544739 JC |
197 | kfree(ltq_mtd->map); |
198 | kfree(ltq_mtd); | |
199 | } | |
200 | return 0; | |
201 | } | |
202 | ||
02fa961f JC |
203 | static const struct of_device_id ltq_mtd_match[] = { |
204 | { .compatible = "lantiq,nor" }, | |
205 | {}, | |
206 | }; | |
207 | MODULE_DEVICE_TABLE(of, ltq_mtd_match); | |
208 | ||
3c544739 | 209 | static struct platform_driver ltq_mtd_driver = { |
02fa961f | 210 | .probe = ltq_mtd_probe, |
5153b88c | 211 | .remove = ltq_mtd_remove, |
3c544739 | 212 | .driver = { |
02fa961f | 213 | .name = "ltq-nor", |
3c544739 | 214 | .owner = THIS_MODULE, |
02fa961f | 215 | .of_match_table = ltq_mtd_match, |
3c544739 JC |
216 | }, |
217 | }; | |
218 | ||
02fa961f | 219 | module_platform_driver(ltq_mtd_driver); |
3c544739 JC |
220 | |
221 | MODULE_LICENSE("GPL"); | |
222 | MODULE_AUTHOR("John Crispin <blogic@openwrt.org>"); | |
223 | MODULE_DESCRIPTION("Lantiq SoC NOR"); |