blob: c03456f17004017ca0cb1f65513343cd8d470b7c [file] [log] [blame]
John Crispin3c544732011-04-12 18:10:01 +02001/*
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
10#include <linux/module.h>
11#include <linux/types.h>
12#include <linux/kernel.h>
13#include <linux/io.h>
14#include <linux/slab.h>
15#include <linux/init.h>
16#include <linux/mtd/mtd.h>
17#include <linux/mtd/map.h>
18#include <linux/mtd/partitions.h>
19#include <linux/mtd/cfi.h>
20#include <linux/platform_device.h>
21#include <linux/mtd/physmap.h>
John Crispinfa09ede2012-05-05 15:41:42 +020022#include <linux/of.h>
John Crispin3c544732011-04-12 18:10:01 +020023
24#include <lantiq_soc.h>
John Crispin3c544732011-04-12 18:10:01 +020025
26/*
27 * The NOR flash is connected to the same external bus unit (EBU) as PCI.
28 * To make PCI work we need to enable the endianness swapping for the address
29 * written to the EBU. This endianness swapping works for PCI correctly but
30 * fails for attached NOR devices. To workaround this we need to use a complex
31 * map. The workaround involves swapping all addresses whilst probing the chip.
32 * Once probing is complete we stop swapping the addresses but swizzle the
33 * unlock addresses to ensure that access to the NOR device works correctly.
34 */
35
36enum {
37 LTQ_NOR_PROBING,
38 LTQ_NOR_NORMAL
39};
40
41struct ltq_mtd {
42 struct resource *res;
43 struct mtd_info *mtd;
44 struct map_info *map;
45};
46
John Crispin02fa9612012-04-13 09:36:46 +020047static const char ltq_map_name[] = "ltq_nor";
48static const char *ltq_probe_types[] __devinitconst = {
49 "cmdlinepart", "ofpart", NULL };
John Crispin3c544732011-04-12 18:10:01 +020050
51static map_word
52ltq_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
65static void
66ltq_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 */
84static void
85ltq_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
98static void
99ltq_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
John Crispin02fa9612012-04-13 09:36:46 +0200112static int __devinit
John Crispin3c544732011-04-12 18:10:01 +0200113ltq_mtd_probe(struct platform_device *pdev)
114{
John Crispin02fa9612012-04-13 09:36:46 +0200115 struct mtd_part_parser_data ppdata;
John Crispin3c544732011-04-12 18:10:01 +0200116 struct ltq_mtd *ltq_mtd;
John Crispin3c544732011-04-12 18:10:01 +0200117 struct cfi_private *cfi;
118 int err;
119
John Crispinfa09ede2012-05-05 15:41:42 +0200120 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
John Crispin3c544732011-04-12 18:10:01 +0200126 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) {
John Crispin02fa9612012-04-13 09:36:46 +0200131 dev_err(&pdev->dev, "failed to get memory resource\n");
John Crispin3c544732011-04-12 18:10:01 +0200132 err = -ENOENT;
133 goto err_out;
134 }
135
John Crispin02fa9612012-04-13 09:36:46 +0200136 ltq_mtd->map = kzalloc(sizeof(struct map_info), GFP_KERNEL);
137 ltq_mtd->map->phys = ltq_mtd->res->start;
138 ltq_mtd->map->size = resource_size(ltq_mtd->res);
139 ltq_mtd->map->virt = devm_request_and_ioremap(&pdev->dev, ltq_mtd->res);
140 if (!ltq_mtd->map->virt) {
141 dev_err(&pdev->dev, "failed to remap mem resource\n");
John Crispin3c544732011-04-12 18:10:01 +0200142 err = -EBUSY;
143 goto err_out;
144 }
145
John Crispin3c544732011-04-12 18:10:01 +0200146 ltq_mtd->map->name = ltq_map_name;
147 ltq_mtd->map->bankwidth = 2;
148 ltq_mtd->map->read = ltq_read16;
149 ltq_mtd->map->write = ltq_write16;
150 ltq_mtd->map->copy_from = ltq_copy_from;
151 ltq_mtd->map->copy_to = ltq_copy_to;
152
153 ltq_mtd->map->map_priv_1 = LTQ_NOR_PROBING;
154 ltq_mtd->mtd = do_map_probe("cfi_probe", ltq_mtd->map);
155 ltq_mtd->map->map_priv_1 = LTQ_NOR_NORMAL;
156
157 if (!ltq_mtd->mtd) {
158 dev_err(&pdev->dev, "probing failed\n");
159 err = -ENXIO;
Julia Lawallaf32b362011-12-26 18:38:01 +0100160 goto err_free;
John Crispin3c544732011-04-12 18:10:01 +0200161 }
162
163 ltq_mtd->mtd->owner = THIS_MODULE;
164
165 cfi = ltq_mtd->map->fldrv_priv;
166 cfi->addr_unlock1 ^= 1;
167 cfi->addr_unlock2 ^= 1;
168
John Crispin02fa9612012-04-13 09:36:46 +0200169 ppdata.of_node = pdev->dev.of_node;
170 err = mtd_device_parse_register(ltq_mtd->mtd, ltq_probe_types,
171 &ppdata, NULL, 0);
John Crispin3c544732011-04-12 18:10:01 +0200172 if (err) {
173 dev_err(&pdev->dev, "failed to add partitions\n");
174 goto err_destroy;
175 }
176
177 return 0;
178
179err_destroy:
180 map_destroy(ltq_mtd->mtd);
John Crispin3c544732011-04-12 18:10:01 +0200181err_free:
182 kfree(ltq_mtd->map);
183err_out:
184 kfree(ltq_mtd);
185 return err;
186}
187
188static int __devexit
189ltq_mtd_remove(struct platform_device *pdev)
190{
191 struct ltq_mtd *ltq_mtd = platform_get_drvdata(pdev);
192
193 if (ltq_mtd) {
194 if (ltq_mtd->mtd) {
John Crispin2e5db862011-06-09 19:57:33 +0200195 mtd_device_unregister(ltq_mtd->mtd);
John Crispin3c544732011-04-12 18:10:01 +0200196 map_destroy(ltq_mtd->mtd);
197 }
John Crispin3c544732011-04-12 18:10:01 +0200198 kfree(ltq_mtd->map);
199 kfree(ltq_mtd);
200 }
201 return 0;
202}
203
John Crispin02fa9612012-04-13 09:36:46 +0200204static const struct of_device_id ltq_mtd_match[] = {
205 { .compatible = "lantiq,nor" },
206 {},
207};
208MODULE_DEVICE_TABLE(of, ltq_mtd_match);
209
John Crispin3c544732011-04-12 18:10:01 +0200210static struct platform_driver ltq_mtd_driver = {
John Crispin02fa9612012-04-13 09:36:46 +0200211 .probe = ltq_mtd_probe,
John Crispin3c544732011-04-12 18:10:01 +0200212 .remove = __devexit_p(ltq_mtd_remove),
213 .driver = {
John Crispin02fa9612012-04-13 09:36:46 +0200214 .name = "ltq-nor",
John Crispin3c544732011-04-12 18:10:01 +0200215 .owner = THIS_MODULE,
John Crispin02fa9612012-04-13 09:36:46 +0200216 .of_match_table = ltq_mtd_match,
John Crispin3c544732011-04-12 18:10:01 +0200217 },
218};
219
John Crispin02fa9612012-04-13 09:36:46 +0200220module_platform_driver(ltq_mtd_driver);
John Crispin3c544732011-04-12 18:10:01 +0200221
222MODULE_LICENSE("GPL");
223MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
224MODULE_DESCRIPTION("Lantiq SoC NOR");