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Linux/drivers/mtd/maps/latch-addr-flash.c

  1 /*
  2  * Interface for NOR flash driver whose high address lines are latched
  3  *
  4  * Copyright © 2000 Nicolas Pitre <nico@cam.org>
  5  * Copyright © 2005-2008 Analog Devices Inc.
  6  * Copyright © 2008 MontaVista Software, Inc. <source@mvista.com>
  7  *
  8  * This file is licensed under the terms of the GNU General Public License
  9  * version 2. This program is licensed "as is" without any warranty of any
 10  * kind, whether express or implied.
 11  */
 12 
 13 #include <linux/kernel.h>
 14 #include <linux/module.h>
 15 #include <linux/mtd/mtd.h>
 16 #include <linux/mtd/map.h>
 17 #include <linux/mtd/partitions.h>
 18 #include <linux/platform_device.h>
 19 #include <linux/mtd/latch-addr-flash.h>
 20 #include <linux/slab.h>
 21 
 22 #define DRIVER_NAME "latch-addr-flash"
 23 
 24 struct latch_addr_flash_info {
 25         struct mtd_info         *mtd;
 26         struct map_info         map;
 27         struct resource         *res;
 28 
 29         void                    (*set_window)(unsigned long offset, void *data);
 30         void                    *data;
 31 
 32         /* cache; could be found out of res */
 33         unsigned long           win_mask;
 34 
 35         spinlock_t              lock;
 36 };
 37 
 38 static map_word lf_read(struct map_info *map, unsigned long ofs)
 39 {
 40         struct latch_addr_flash_info *info;
 41         map_word datum;
 42 
 43         info = (struct latch_addr_flash_info *)map->map_priv_1;
 44 
 45         spin_lock(&info->lock);
 46 
 47         info->set_window(ofs, info->data);
 48         datum = inline_map_read(map, info->win_mask & ofs);
 49 
 50         spin_unlock(&info->lock);
 51 
 52         return datum;
 53 }
 54 
 55 static void lf_write(struct map_info *map, map_word datum, unsigned long ofs)
 56 {
 57         struct latch_addr_flash_info *info;
 58 
 59         info = (struct latch_addr_flash_info *)map->map_priv_1;
 60 
 61         spin_lock(&info->lock);
 62 
 63         info->set_window(ofs, info->data);
 64         inline_map_write(map, datum, info->win_mask & ofs);
 65 
 66         spin_unlock(&info->lock);
 67 }
 68 
 69 static void lf_copy_from(struct map_info *map, void *to,
 70                 unsigned long from, ssize_t len)
 71 {
 72         struct latch_addr_flash_info *info =
 73                 (struct latch_addr_flash_info *) map->map_priv_1;
 74         unsigned n;
 75 
 76         while (len > 0) {
 77                 n = info->win_mask + 1 - (from & info->win_mask);
 78                 if (n > len)
 79                         n = len;
 80 
 81                 spin_lock(&info->lock);
 82 
 83                 info->set_window(from, info->data);
 84                 memcpy_fromio(to, map->virt + (from & info->win_mask), n);
 85 
 86                 spin_unlock(&info->lock);
 87 
 88                 to += n;
 89                 from += n;
 90                 len -= n;
 91         }
 92 }
 93 
 94 static char *rom_probe_types[] = { "cfi_probe", NULL };
 95 
 96 static int latch_addr_flash_remove(struct platform_device *dev)
 97 {
 98         struct latch_addr_flash_info *info;
 99         struct latch_addr_flash_data *latch_addr_data;
100 
101         info = platform_get_drvdata(dev);
102         if (info == NULL)
103                 return 0;
104 
105         latch_addr_data = dev_get_platdata(&dev->dev);
106 
107         if (info->mtd != NULL) {
108                 mtd_device_unregister(info->mtd);
109                 map_destroy(info->mtd);
110         }
111 
112         if (info->map.virt != NULL)
113                 iounmap(info->map.virt);
114 
115         if (info->res != NULL)
116                 release_mem_region(info->res->start, resource_size(info->res));
117 
118         kfree(info);
119 
120         if (latch_addr_data->done)
121                 latch_addr_data->done(latch_addr_data->data);
122 
123         return 0;
124 }
125 
126 static int latch_addr_flash_probe(struct platform_device *dev)
127 {
128         struct latch_addr_flash_data *latch_addr_data;
129         struct latch_addr_flash_info *info;
130         resource_size_t win_base = dev->resource->start;
131         resource_size_t win_size = resource_size(dev->resource);
132         char **probe_type;
133         int chipsel;
134         int err;
135 
136         latch_addr_data = dev_get_platdata(&dev->dev);
137         if (latch_addr_data == NULL)
138                 return -ENODEV;
139 
140         pr_notice("latch-addr platform flash device: %#llx byte "
141                   "window at %#.8llx\n",
142                   (unsigned long long)win_size, (unsigned long long)win_base);
143 
144         chipsel = dev->id;
145 
146         if (latch_addr_data->init) {
147                 err = latch_addr_data->init(latch_addr_data->data, chipsel);
148                 if (err != 0)
149                         return err;
150         }
151 
152         info = kzalloc(sizeof(struct latch_addr_flash_info), GFP_KERNEL);
153         if (info == NULL) {
154                 err = -ENOMEM;
155                 goto done;
156         }
157 
158         platform_set_drvdata(dev, info);
159 
160         info->res = request_mem_region(win_base, win_size, DRIVER_NAME);
161         if (info->res == NULL) {
162                 dev_err(&dev->dev, "Could not reserve memory region\n");
163                 err = -EBUSY;
164                 goto free_info;
165         }
166 
167         info->map.name          = DRIVER_NAME;
168         info->map.size          = latch_addr_data->size;
169         info->map.bankwidth     = latch_addr_data->width;
170 
171         info->map.phys          = NO_XIP;
172         info->map.virt          = ioremap(win_base, win_size);
173         if (!info->map.virt) {
174                 err = -ENOMEM;
175                 goto free_res;
176         }
177 
178         info->map.map_priv_1    = (unsigned long)info;
179 
180         info->map.read          = lf_read;
181         info->map.copy_from     = lf_copy_from;
182         info->map.write         = lf_write;
183         info->set_window        = latch_addr_data->set_window;
184         info->data              = latch_addr_data->data;
185         info->win_mask          = win_size - 1;
186 
187         spin_lock_init(&info->lock);
188 
189         for (probe_type = rom_probe_types; !info->mtd && *probe_type;
190                 probe_type++)
191                 info->mtd = do_map_probe(*probe_type, &info->map);
192 
193         if (info->mtd == NULL) {
194                 dev_err(&dev->dev, "map_probe failed\n");
195                 err = -ENODEV;
196                 goto iounmap;
197         }
198         info->mtd->owner = THIS_MODULE;
199 
200         mtd_device_parse_register(info->mtd, NULL, NULL,
201                                   latch_addr_data->parts,
202                                   latch_addr_data->nr_parts);
203         return 0;
204 
205 iounmap:
206         iounmap(info->map.virt);
207 free_res:
208         release_mem_region(info->res->start, resource_size(info->res));
209 free_info:
210         kfree(info);
211 done:
212         if (latch_addr_data->done)
213                 latch_addr_data->done(latch_addr_data->data);
214         return err;
215 }
216 
217 static struct platform_driver latch_addr_flash_driver = {
218         .probe          = latch_addr_flash_probe,
219         .remove         = latch_addr_flash_remove,
220         .driver         = {
221                 .name   = DRIVER_NAME,
222         },
223 };
224 
225 module_platform_driver(latch_addr_flash_driver);
226 
227 MODULE_AUTHOR("David Griego <dgriego@mvista.com>");
228 MODULE_DESCRIPTION("MTD map driver for flashes addressed physically with upper "
229                 "address lines being set board specifically");
230 MODULE_LICENSE("GPL v2");
231 

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