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Linux/drivers/mtd/maps/sa1100-flash.c

  1 /*
  2  * Flash memory access on SA11x0 based devices
  3  *
  4  * (C) 2000 Nicolas Pitre <nico@fluxnic.net>
  5  */
  6 #include <linux/module.h>
  7 #include <linux/types.h>
  8 #include <linux/ioport.h>
  9 #include <linux/kernel.h>
 10 #include <linux/init.h>
 11 #include <linux/errno.h>
 12 #include <linux/slab.h>
 13 #include <linux/platform_device.h>
 14 #include <linux/err.h>
 15 #include <linux/io.h>
 16 
 17 #include <linux/mtd/mtd.h>
 18 #include <linux/mtd/map.h>
 19 #include <linux/mtd/partitions.h>
 20 #include <linux/mtd/concat.h>
 21 
 22 #include <mach/hardware.h>
 23 #include <asm/sizes.h>
 24 #include <asm/mach/flash.h>
 25 
 26 struct sa_subdev_info {
 27         char name[16];
 28         struct map_info map;
 29         struct mtd_info *mtd;
 30         struct flash_platform_data *plat;
 31 };
 32 
 33 struct sa_info {
 34         struct mtd_info         *mtd;
 35         int                     num_subdev;
 36         struct sa_subdev_info   subdev[0];
 37 };
 38 
 39 static DEFINE_SPINLOCK(sa1100_vpp_lock);
 40 static int sa1100_vpp_refcnt;
 41 static void sa1100_set_vpp(struct map_info *map, int on)
 42 {
 43         struct sa_subdev_info *subdev = container_of(map, struct sa_subdev_info, map);
 44         unsigned long flags;
 45 
 46         spin_lock_irqsave(&sa1100_vpp_lock, flags);
 47         if (on) {
 48                 if (++sa1100_vpp_refcnt == 1)   /* first nested 'on' */
 49                         subdev->plat->set_vpp(1);
 50         } else {
 51                 if (--sa1100_vpp_refcnt == 0)   /* last nested 'off' */
 52                         subdev->plat->set_vpp(0);
 53         }
 54         spin_unlock_irqrestore(&sa1100_vpp_lock, flags);
 55 }
 56 
 57 static void sa1100_destroy_subdev(struct sa_subdev_info *subdev)
 58 {
 59         if (subdev->mtd)
 60                 map_destroy(subdev->mtd);
 61         if (subdev->map.virt)
 62                 iounmap(subdev->map.virt);
 63         release_mem_region(subdev->map.phys, subdev->map.size);
 64 }
 65 
 66 static int sa1100_probe_subdev(struct sa_subdev_info *subdev, struct resource *res)
 67 {
 68         unsigned long phys;
 69         unsigned int size;
 70         int ret;
 71 
 72         phys = res->start;
 73         size = res->end - phys + 1;
 74 
 75         /*
 76          * Retrieve the bankwidth from the MSC registers.
 77          * We currently only implement CS0 and CS1 here.
 78          */
 79         switch (phys) {
 80         default:
 81                 printk(KERN_WARNING "SA1100 flash: unknown base address "
 82                        "0x%08lx, assuming CS0\n", phys);
 83 
 84         case SA1100_CS0_PHYS:
 85                 subdev->map.bankwidth = (MSC0 & MSC_RBW) ? 2 : 4;
 86                 break;
 87 
 88         case SA1100_CS1_PHYS:
 89                 subdev->map.bankwidth = ((MSC0 >> 16) & MSC_RBW) ? 2 : 4;
 90                 break;
 91         }
 92 
 93         if (!request_mem_region(phys, size, subdev->name)) {
 94                 ret = -EBUSY;
 95                 goto out;
 96         }
 97 
 98         if (subdev->plat->set_vpp)
 99                 subdev->map.set_vpp = sa1100_set_vpp;
100 
101         subdev->map.phys = phys;
102         subdev->map.size = size;
103         subdev->map.virt = ioremap(phys, size);
104         if (!subdev->map.virt) {
105                 ret = -ENOMEM;
106                 goto err;
107         }
108 
109         simple_map_init(&subdev->map);
110 
111         /*
112          * Now let's probe for the actual flash.  Do it here since
113          * specific machine settings might have been set above.
114          */
115         subdev->mtd = do_map_probe(subdev->plat->map_name, &subdev->map);
116         if (subdev->mtd == NULL) {
117                 ret = -ENXIO;
118                 goto err;
119         }
120         subdev->mtd->owner = THIS_MODULE;
121 
122         printk(KERN_INFO "SA1100 flash: CFI device at 0x%08lx, %uMiB, %d-bit\n",
123                 phys, (unsigned)(subdev->mtd->size >> 20),
124                 subdev->map.bankwidth * 8);
125 
126         return 0;
127 
128  err:
129         sa1100_destroy_subdev(subdev);
130  out:
131         return ret;
132 }
133 
134 static void sa1100_destroy(struct sa_info *info, struct flash_platform_data *plat)
135 {
136         int i;
137 
138         if (info->mtd) {
139                 mtd_device_unregister(info->mtd);
140                 if (info->mtd != info->subdev[0].mtd)
141                         mtd_concat_destroy(info->mtd);
142         }
143 
144         for (i = info->num_subdev - 1; i >= 0; i--)
145                 sa1100_destroy_subdev(&info->subdev[i]);
146         kfree(info);
147 
148         if (plat->exit)
149                 plat->exit();
150 }
151 
152 static struct sa_info *sa1100_setup_mtd(struct platform_device *pdev,
153                                         struct flash_platform_data *plat)
154 {
155         struct sa_info *info;
156         int nr, size, i, ret = 0;
157 
158         /*
159          * Count number of devices.
160          */
161         for (nr = 0; ; nr++)
162                 if (!platform_get_resource(pdev, IORESOURCE_MEM, nr))
163                         break;
164 
165         if (nr == 0) {
166                 ret = -ENODEV;
167                 goto out;
168         }
169 
170         size = sizeof(struct sa_info) + sizeof(struct sa_subdev_info) * nr;
171 
172         /*
173          * Allocate the map_info structs in one go.
174          */
175         info = kzalloc(size, GFP_KERNEL);
176         if (!info) {
177                 ret = -ENOMEM;
178                 goto out;
179         }
180 
181         if (plat->init) {
182                 ret = plat->init();
183                 if (ret)
184                         goto err;
185         }
186 
187         /*
188          * Claim and then map the memory regions.
189          */
190         for (i = 0; i < nr; i++) {
191                 struct sa_subdev_info *subdev = &info->subdev[i];
192                 struct resource *res;
193 
194                 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
195                 if (!res)
196                         break;
197 
198                 subdev->map.name = subdev->name;
199                 sprintf(subdev->name, "%s-%d", plat->name, i);
200                 subdev->plat = plat;
201 
202                 ret = sa1100_probe_subdev(subdev, res);
203                 if (ret)
204                         break;
205         }
206 
207         info->num_subdev = i;
208 
209         /*
210          * ENXIO is special.  It means we didn't find a chip when we probed.
211          */
212         if (ret != 0 && !(ret == -ENXIO && info->num_subdev > 0))
213                 goto err;
214 
215         /*
216          * If we found one device, don't bother with concat support.  If
217          * we found multiple devices, use concat if we have it available,
218          * otherwise fail.  Either way, it'll be called "sa1100".
219          */
220         if (info->num_subdev == 1) {
221                 strcpy(info->subdev[0].name, plat->name);
222                 info->mtd = info->subdev[0].mtd;
223                 ret = 0;
224         } else if (info->num_subdev > 1) {
225                 struct mtd_info *cdev[nr];
226                 /*
227                  * We detected multiple devices.  Concatenate them together.
228                  */
229                 for (i = 0; i < info->num_subdev; i++)
230                         cdev[i] = info->subdev[i].mtd;
231 
232                 info->mtd = mtd_concat_create(cdev, info->num_subdev,
233                                               plat->name);
234                 if (info->mtd == NULL)
235                         ret = -ENXIO;
236         }
237 
238         if (ret == 0)
239                 return info;
240 
241  err:
242         sa1100_destroy(info, plat);
243  out:
244         return ERR_PTR(ret);
245 }
246 
247 static const char * const part_probes[] = { "cmdlinepart", "RedBoot", NULL };
248 
249 static int sa1100_mtd_probe(struct platform_device *pdev)
250 {
251         struct flash_platform_data *plat = dev_get_platdata(&pdev->dev);
252         struct sa_info *info;
253         int err;
254 
255         if (!plat)
256                 return -ENODEV;
257 
258         info = sa1100_setup_mtd(pdev, plat);
259         if (IS_ERR(info)) {
260                 err = PTR_ERR(info);
261                 goto out;
262         }
263 
264         /*
265          * Partition selection stuff.
266          */
267         mtd_device_parse_register(info->mtd, part_probes, NULL, plat->parts,
268                                   plat->nr_parts);
269 
270         platform_set_drvdata(pdev, info);
271         err = 0;
272 
273  out:
274         return err;
275 }
276 
277 static int __exit sa1100_mtd_remove(struct platform_device *pdev)
278 {
279         struct sa_info *info = platform_get_drvdata(pdev);
280         struct flash_platform_data *plat = dev_get_platdata(&pdev->dev);
281 
282         sa1100_destroy(info, plat);
283 
284         return 0;
285 }
286 
287 static struct platform_driver sa1100_mtd_driver = {
288         .probe          = sa1100_mtd_probe,
289         .remove         = __exit_p(sa1100_mtd_remove),
290         .driver         = {
291                 .name   = "sa1100-mtd",
292                 .owner  = THIS_MODULE,
293         },
294 };
295 
296 module_platform_driver(sa1100_mtd_driver);
297 
298 MODULE_AUTHOR("Nicolas Pitre");
299 MODULE_DESCRIPTION("SA1100 CFI map driver");
300 MODULE_LICENSE("GPL");
301 MODULE_ALIAS("platform:sa1100-mtd");
302 

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