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authorVitaly Wool <vwool@ru.mvista.com>2006-12-06 05:17:49 -0500
committerDavid Woodhouse <dwmw2@infradead.org>2006-12-08 08:32:34 -0500
commita2c2fe4b242cb9c62951ae154594cffbb94ab2ad (patch)
treeb42b889619de6667c117ef774ac4ab6f0f0270bb /drivers/mtd/maps
parentf33665d931f33a0baf44fc5d3594b23f8118eb44 (diff)
[MTD] of_device-based physmap driver
inlined below is the patch that adds physmap driver for of_device. It's an MTD part of the two-part support for flash/ROM devices based on Open Firmware descriptions. The arch part (currently only PowerPC which is no surprise) was introduced to powerpc folks earlier and recently the older version of the powerpc part has been included into the powerpc.git tree (see http://www.kernel.org/git/?p=linux/kernel/git/paulus/powerpc.git;a=commitdiff;h=28f9ec349ae47c91768b7bc5607db4442c818e11). drivers/mtd/maps/Kconfig | 9 + drivers/mtd/maps/Makefile | 1 drivers/mtd/maps/physmap_of.c | 255 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 265 insertions(+) Signed-off-by: Vitaly Wool <vwool@ru.mvista.com> Signed-off-by: Sergey Shtylyov <sshtylyov@ru.mvista.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Diffstat (limited to 'drivers/mtd/maps')
-rw-r--r--drivers/mtd/maps/Kconfig9
-rw-r--r--drivers/mtd/maps/Makefile1
-rw-r--r--drivers/mtd/maps/physmap_of.c255
3 files changed, 265 insertions, 0 deletions
diff --git a/drivers/mtd/maps/Kconfig b/drivers/mtd/maps/Kconfig
index fa7466886fd6..4a51a3d639be 100644
--- a/drivers/mtd/maps/Kconfig
+++ b/drivers/mtd/maps/Kconfig
@@ -60,6 +60,15 @@ config MTD_PHYSMAP_BANKWIDTH
60 Ignore this option if you use run-time physmap configuration 60 Ignore this option if you use run-time physmap configuration
61 (i.e., run-time calling physmap_configure()). 61 (i.e., run-time calling physmap_configure()).
62 62
63config MTD_PHYSMAP_OF
64 tristate "Flash device in physical memory map based on OF descirption"
65 depends on PPC_OF && (MTD_CFI || MTD_JEDECPROBE || MTD_ROM)
66 help
67 This provides a 'mapping' driver which allows the NOR Flash and
68 ROM driver code to communicate with chips which are mapped
69 physically into the CPU's memory. The mapping description here is
70 taken from OF device tree.
71
63config MTD_SUN_UFLASH 72config MTD_SUN_UFLASH
64 tristate "Sun Microsystems userflash support" 73 tristate "Sun Microsystems userflash support"
65 depends on SPARC && MTD_CFI 74 depends on SPARC && MTD_CFI
diff --git a/drivers/mtd/maps/Makefile b/drivers/mtd/maps/Makefile
index 34505216d403..df019be753e3 100644
--- a/drivers/mtd/maps/Makefile
+++ b/drivers/mtd/maps/Makefile
@@ -27,6 +27,7 @@ obj-$(CONFIG_MTD_MBX860) += mbx860.o
27obj-$(CONFIG_MTD_CEIVA) += ceiva.o 27obj-$(CONFIG_MTD_CEIVA) += ceiva.o
28obj-$(CONFIG_MTD_OCTAGON) += octagon-5066.o 28obj-$(CONFIG_MTD_OCTAGON) += octagon-5066.o
29obj-$(CONFIG_MTD_PHYSMAP) += physmap.o 29obj-$(CONFIG_MTD_PHYSMAP) += physmap.o
30obj-$(CONFIG_MTD_PHYSMAP_OF) += physmap_of.o
30obj-$(CONFIG_MTD_PNC2000) += pnc2000.o 31obj-$(CONFIG_MTD_PNC2000) += pnc2000.o
31obj-$(CONFIG_MTD_PCMCIA) += pcmciamtd.o 32obj-$(CONFIG_MTD_PCMCIA) += pcmciamtd.o
32obj-$(CONFIG_MTD_RPXLITE) += rpxlite.o 33obj-$(CONFIG_MTD_RPXLITE) += rpxlite.o
diff --git a/drivers/mtd/maps/physmap_of.c b/drivers/mtd/maps/physmap_of.c
new file mode 100644
index 000000000000..7efe744ad31e
--- /dev/null
+++ b/drivers/mtd/maps/physmap_of.c
@@ -0,0 +1,255 @@
1/*
2 * Normal mappings of chips in physical memory for OF devices
3 *
4 * Copyright (C) 2006 MontaVista Software Inc.
5 * Author: Vitaly Wool <vwool@ru.mvista.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 */
12
13#include <linux/module.h>
14#include <linux/types.h>
15#include <linux/kernel.h>
16#include <linux/init.h>
17#include <linux/slab.h>
18#include <linux/device.h>
19#include <linux/mtd/mtd.h>
20#include <linux/mtd/map.h>
21#include <linux/mtd/partitions.h>
22#include <linux/mtd/physmap.h>
23#include <asm/io.h>
24#include <asm/prom.h>
25#include <asm/of_device.h>
26#include <asm/of_platform.h>
27
28struct physmap_flash_info {
29 struct mtd_info *mtd;
30 struct map_info map;
31 struct resource *res;
32#ifdef CONFIG_MTD_PARTITIONS
33 int nr_parts;
34 struct mtd_partition *parts;
35#endif
36};
37
38static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
39#ifdef CONFIG_MTD_PARTITIONS
40static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
41#endif
42
43#ifdef CONFIG_MTD_PARTITIONS
44static int parse_flash_partitions(struct device_node *node,
45 struct mtd_partition **parts)
46{
47 int i, plen, retval = -ENOMEM;
48 const u32 *part;
49 const char *name;
50
51 part = get_property(node, "partitions", &plen);
52 if (part == NULL)
53 goto err;
54
55 retval = plen / (2 * sizeof(u32));
56 *parts = kzalloc(retval * sizeof(struct mtd_partition), GFP_KERNEL);
57 if (*parts == NULL) {
58 printk(KERN_ERR "Can't allocate the flash partition data!\n");
59 goto err;
60 }
61
62 name = get_property(node, "partition-names", &plen);
63
64 for (i = 0; i < retval; i++) {
65 (*parts)[i].offset = *part++;
66 (*parts)[i].size = *part & ~1;
67 if (*part++ & 1) /* bit 0 set signifies read only partition */
68 (*parts)[i].mask_flags = MTD_WRITEABLE;
69
70 if (name != NULL && plen > 0) {
71 int len = strlen(name) + 1;
72
73 (*parts)[i].name = (char *)name;
74 plen -= len;
75 name += len;
76 } else
77 (*parts)[i].name = "unnamed";
78 }
79err:
80 return retval;
81}
82#endif
83
84static int of_physmap_remove(struct of_device *dev)
85{
86 struct physmap_flash_info *info;
87
88 info = dev_get_drvdata(&dev->dev);
89 if (info == NULL)
90 return 0;
91 dev_set_drvdata(&dev->dev, NULL);
92
93 if (info->mtd != NULL) {
94#ifdef CONFIG_MTD_PARTITIONS
95 if (info->nr_parts) {
96 del_mtd_partitions(info->mtd);
97 kfree(info->parts);
98 } else {
99 del_mtd_device(info->mtd);
100 }
101#else
102 del_mtd_device(info->mtd);
103#endif
104 map_destroy(info->mtd);
105 }
106
107 if (info->map.virt != NULL)
108 iounmap(info->map.virt);
109
110 if (info->res != NULL) {
111 release_resource(info->res);
112 kfree(info->res);
113 }
114
115 return 0;
116}
117
118static int __devinit of_physmap_probe(struct of_device *dev, const struct of_device_id *match)
119{
120 struct device_node *dp = dev->node;
121 struct resource res;
122 struct physmap_flash_info *info;
123 const char **probe_type;
124 const char *of_probe;
125 const u32 *width;
126 int err;
127
128
129 if (of_address_to_resource(dp, 0, &res)) {
130 dev_err(&dev->dev, "Can't get the flash mapping!\n");
131 err = -EINVAL;
132 goto err_out;
133 }
134
135 dev_dbg(&dev->dev, "physmap flash device: %.8llx at %.8llx\n",
136 (unsigned long long)res.end - res.start + 1,
137 (unsigned long long)res.start);
138
139 info = kzalloc(sizeof(struct physmap_flash_info), GFP_KERNEL);
140 if (info == NULL) {
141 err = -ENOMEM;
142 goto err_out;
143 }
144 memset(info, 0, sizeof(*info));
145
146 dev_set_drvdata(&dev->dev, info);
147
148 info->res = request_mem_region(res.start, res.end - res.start + 1,
149 dev->dev.bus_id);
150 if (info->res == NULL) {
151 dev_err(&dev->dev, "Could not reserve memory region\n");
152 err = -ENOMEM;
153 goto err_out;
154 }
155
156 width = get_property(dp, "bank-width", NULL);
157 if (width == NULL) {
158 dev_err(&dev->dev, "Can't get the flash bank width!\n");
159 err = -EINVAL;
160 goto err_out;
161 }
162
163 info->map.name = dev->dev.bus_id;
164 info->map.phys = res.start;
165 info->map.size = res.end - res.start + 1;
166 info->map.bankwidth = *width;
167
168 info->map.virt = ioremap(info->map.phys, info->map.size);
169 if (info->map.virt == NULL) {
170 dev_err(&dev->dev, "Failed to ioremap flash region\n");
171 err = EIO;
172 goto err_out;
173 }
174
175 simple_map_init(&info->map);
176
177 of_probe = get_property(dp, "probe-type", NULL);
178 if (of_probe == NULL) {
179 probe_type = rom_probe_types;
180 for (; info->mtd == NULL && *probe_type != NULL; probe_type++)
181 info->mtd = do_map_probe(*probe_type, &info->map);
182 } else if (!strcmp(of_probe, "CFI"))
183 info->mtd = do_map_probe("cfi_probe", &info->map);
184 else if (!strcmp(of_probe, "JEDEC"))
185 info->mtd = do_map_probe("jedec_probe", &info->map);
186 else {
187 if (strcmp(of_probe, "ROM"))
188 dev_dbg(&dev->dev, "map_probe: don't know probe type "
189 "'%s', mapping as rom\n");
190 info->mtd = do_map_probe("mtd_rom", &info->map);
191 }
192 if (info->mtd == NULL) {
193 dev_err(&dev->dev, "map_probe failed\n");
194 err = -ENXIO;
195 goto err_out;
196 }
197 info->mtd->owner = THIS_MODULE;
198
199#ifdef CONFIG_MTD_PARTITIONS
200 err = parse_mtd_partitions(info->mtd, part_probe_types, &info->parts, 0);
201 if (err > 0) {
202 add_mtd_partitions(info->mtd, info->parts, err);
203 } else if ((err = parse_flash_partitions(dp, &info->parts)) > 0) {
204 dev_info(&dev->dev, "Using OF partition information\n");
205 add_mtd_partitions(info->mtd, info->parts, err);
206 info->nr_parts = err;
207 } else
208#endif
209
210 add_mtd_device(info->mtd);
211 return 0;
212
213err_out:
214 of_physmap_remove(dev);
215 return err;
216
217 return 0;
218
219
220}
221
222static struct of_device_id of_physmap_match[] = {
223 {
224 .type = "rom",
225 .compatible = "direct-mapped"
226 },
227 { },
228};
229
230MODULE_DEVICE_TABLE(of, of_physmap_match);
231
232
233static struct of_platform_driver of_physmap_flash_driver = {
234 .name = "physmap-flash",
235 .match_table = of_physmap_match,
236 .probe = of_physmap_probe,
237 .remove = of_physmap_remove,
238};
239
240static int __init of_physmap_init(void)
241{
242 return of_register_platform_driver(&of_physmap_flash_driver);
243}
244
245static void __exit of_physmap_exit(void)
246{
247 of_unregister_platform_driver(&of_physmap_flash_driver);
248}
249
250module_init(of_physmap_init);
251module_exit(of_physmap_exit);
252
253MODULE_LICENSE("GPL");
254MODULE_AUTHOR("Vitaly Wool <vwool@ru.mvista.com>");
255MODULE_DESCRIPTION("Configurable MTD map driver for OF");