target/linux/rb532/files/drivers/block/rb500/bdev.c

   1 /* CF-mips driver
   2    This is a block driver for the direct (mmaped) interface to the CF-slot,
   3    found in Routerboard.com's RB532 board
   4    See SDK provided from routerboard.com.
   5
   6    Module adapted By P.Christeas <p_christeas@yahoo.com>, 2005-6.
   7    Cleaned up and adapted to platform_device by Felix Fietkau <nbd@openwrt.org>
   8
   9    This work is redistributed under the terms of the GNU General Public License.
  10 */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/time.h>
  16 #include <linux/wait.h>
  17 #include <linux/fs.h>
  18 #include <linux/genhd.h>
  19 #include <linux/blkdev.h>
  20 #include <linux/blkpg.h>
  21 #include <linux/hdreg.h>
  22 #include <linux/platform_device.h>
  23
  24 #include <asm/uaccess.h>
  25 #include <asm/io.h>
  26 #include <asm/gpio.h>
  27
  28 #include <asm/rc32434/rb.h>
  29
  30 #ifdef DEBUG
  31 #define DEBUGP printk
  32 #define DLEVEL 1
  33 #else
  34 #define DEBUGP(format, args...)
  35 #define DLEVEL 0
  36 #endif
  37
  38 #define CF_MIPS_MAJOR 13
  39 #define MAJOR_NR        CF_MIPS_MAJOR
  40 #define CF_MAX_PART     16              /* max 15 partitions */
  41
  42 #include "ata.h"
  43
  44 //extern struct block_device_operations cf_bdops;
  45
  46 // static struct hd_struct cf_parts[CF_MAX_PART];
  47 // static int cf_part_sizes[CF_MAX_PART];
  48 // static int cf_hsect_sizes[CF_MAX_PART];
  49 // static int cf_max_sectors[CF_MAX_PART];
  50 // static int cf_blksize_sizes[CF_MAX_PART];
  51
  52 // static spinlock_t lock = SPIN_LOCK_UNLOCKED;
  53
  54 // volatile int cf_busy = 0;
  55
  56 static struct request *active_req = NULL;
  57
  58 static int cf_open (struct inode *, struct file *);
  59 static int cf_release (struct inode *, struct file *);
  60 static int cf_ioctl (struct inode *, struct file *, unsigned, unsigned long);
  61
  62 static void cf_request(request_queue_t * q);
  63 static int cf_transfer(const struct request *req);
  64
  65 /*long (*unlocked_ioctl) (struct file *, unsigned, unsigned long);
  66 long (*compat_ioctl) (struct file *, unsigned, unsigned long);*/
  67 // int (*direct_access) (struct block_device *, sector_t, unsigned long *);
  68 // int (*media_changed) (struct gendisk *);
  69 // int (*revalidate_disk) (struct gendisk *);
  70
  71 static struct block_device_operations cf_bdops = {
  72       .owner = THIS_MODULE,
  73       .open = cf_open,
  74       .release = cf_release,
  75       .ioctl = cf_ioctl,
  76       .media_changed = NULL,
  77       .unlocked_ioctl = NULL,
  78       .revalidate_disk = NULL,
  79       .compat_ioctl = NULL,
  80       .direct_access = NULL
  81 };
  82
  83
  84 int cf_mips_probe(struct platform_device *pdev)
  85 {
  86         struct gendisk* cf_gendisk=NULL;
  87         struct cf_device *cdev = (struct cf_device *) pdev->dev.platform_data;
  88         struct cf_mips_dev *dev;
  89         struct resource *r;
  90         int reg_result;
  91
  92         reg_result = register_blkdev(MAJOR_NR, "cf-mips");
  93         if (reg_result < 0) {
  94                 printk(KERN_WARNING "cf-mips: can't get major %d\n", MAJOR_NR);
  95                 return reg_result;
  96         }
  97
  98         dev = (struct cf_mips_dev *)kmalloc(sizeof(struct cf_mips_dev),GFP_KERNEL);
  99         if (!dev)
 100                 goto out_err;
 101         memset(dev, 0, sizeof(struct cf_mips_dev));
 102         cdev->dev = dev;
 103
 104         dev->pin = cdev->gpio_pin;
 105         dev->irq = platform_get_irq_byname(pdev, "cf_irq");
 106         r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cf_membase");
 107         dev->base = (void *) r->start;
 108
 109         if (cf_init(dev)) goto out_err;
 110         printk("init done");
 111
 112         spin_lock_init(&dev->lock);
 113         dev->queue = blk_init_queue(cf_request,&dev->lock);
 114         if (!dev->queue){
 115                 printk(KERN_ERR "cf-mips: no mem for queue\n");
 116                 goto out_err;
 117         }
 118         blk_queue_max_sectors(dev->queue,ATA_MAX_SECT_PER_CMD);
 119
 120         /* For memory devices, it is always better to avoid crossing segments
 121         inside the same request. */
 122 /*      if (dev->dtype==0x848A){
 123                 printk(KERN_INFO "Setting boundary for cf to 0x%x",(dev->block_size*512)-1);
 124                 blk_queue_segment_boundary(dev->queue, (dev->block_size*512)-1);
 125         }*/
 126
 127         dev->gd = alloc_disk(CF_MAX_PART);
 128         cf_gendisk = dev->gd;
 129         cdev->gd = dev->gd;
 130         if (!cf_gendisk) goto out_err; /* Last of these goto's */
 131
 132         cf_gendisk->major = MAJOR_NR;
 133         cf_gendisk->first_minor = 0;
 134         cf_gendisk->queue=dev->queue;
 135         BUG_ON(cf_gendisk->minors != CF_MAX_PART);
 136         strcpy(cf_gendisk->disk_name,"cfa");
 137         cf_gendisk->fops = &cf_bdops;
 138         cf_gendisk->flags = 0 ; /* is not yet GENHD_FL_REMOVABLE */
 139         cf_gendisk->private_data=dev;
 140
 141         set_capacity(cf_gendisk,dev->sectors * CF_KERNEL_MUL);
 142
 143         /* Let the disk go live */
 144         add_disk(cf_gendisk);
 145 #if 0
 146         result = cf_init();
 147
 148         /* default cfg for all partitions */
 149         memset(cf_parts, 0, sizeof (cf_parts[0]) * CF_MAX_PART);
 150         memset(cf_part_sizes, 0, sizeof (cf_part_sizes[0]) * CF_MAX_PART);
 151         for (i = 0; i < CF_MAX_PART; ++i) {
 152                 cf_hsect_sizes[i] = CF_SECT_SIZE;
 153                 cf_max_sectors[i] = ATA_MAX_SECT_PER_CMD;
 154                 cf_blksize_sizes[i] = BLOCK_SIZE;
 155         }
 156
 157         /* setup info for whole disk (partition 0) */
 158         cf_part_sizes[0] = cf_sectors / 2;
 159         cf_parts[0].nr_sects = cf_sectors;
 160
 161         blk_size[MAJOR_NR] = cf_part_sizes;
 162         blksize_size[MAJOR_NR] = cf_blksize_sizes;
 163         max_sectors[MAJOR_NR] = cf_max_sectors;
 164         hardsect_size[MAJOR_NR] = cf_hsect_sizes;
 165         read_ahead[MAJOR_NR] = 8;       /* (4kB) */
 166
 167         blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
 168
 169         add_gendisk(&cf_gendisk);
 170 #endif
 171 //      printk(KERN_INFO "cf-mips partition check: \n");
 172 //      register_disk(cf_gendisk, MKDEV(MAJOR_NR, 0), CF_MAX_PART,
 173 //                    &cf_bdops, dev->sectors);
 174         return 0;
 175
 176 out_err:
 177         if (dev->queue){
 178                 blk_cleanup_queue(dev->queue);
 179         }
 180         if (reg_result) {
 181                 unregister_blkdev(MAJOR_NR, "cf-mips");
 182                 return reg_result;
 183         }
 184         if (dev){
 185                 cf_cleanup(dev);
 186                 kfree(dev);
 187         }
 188         return 1;
 189 }
 190
 191 static int
 192 cf_mips_remove(struct platform_device *pdev)
 193 {
 194         struct cf_device *cdev = (struct cf_device *) pdev->dev.platform_data;
 195         struct cf_mips_dev *dev = (struct cf_mips_dev *) cdev->dev;
 196
 197         unregister_blkdev(MAJOR_NR, "cf-mips");
 198         blk_cleanup_queue(dev->queue);
 199
 200         del_gendisk(dev->gd);
 201         cf_cleanup(dev);
 202         return 0;
 203 }
 204
 205
 206 static struct platform_driver cf_driver = {
 207         .driver.name = "rb500-cf",
 208         .probe = cf_mips_probe,
 209         .remove = cf_mips_remove,
 210 };
 211
 212 static int __init cf_mips_init(void)
 213 {
 214         printk(KERN_INFO "cf-mips module loaded\n");
 215         return platform_driver_register(&cf_driver);
 216 }
 217
 218 static void cf_mips_cleanup(void)
 219 {
 220         platform_driver_unregister(&cf_driver);
 221         printk(KERN_INFO "cf-mips module removed\n");
 222 }
 223
 224 module_init(cf_mips_init);
 225 module_exit(cf_mips_cleanup);
 226
 227 MODULE_LICENSE("GPL");
 228 MODULE_ALIAS_BLOCKDEV_MAJOR(CF_MIPS_MAJOR);
 229
 230
 231 static int cf_open(struct inode *inode, struct file *filp)
 232 {
 233         struct cf_mips_dev  *dev=inode->i_bdev->bd_disk->private_data;
 234         int minor = MINOR(inode->i_rdev);
 235
 236         if (minor >= CF_MAX_PART)
 237                 return -ENODEV;
 238         //DEBUGP(KERN_INFO "cf-mips module opened, minor %d\n", minor);
 239         spin_lock(&dev->lock);
 240         dev->users++;
 241         spin_unlock(&dev->lock);
 242         filp->private_data=dev;
 243
 244         /* dirty workaround to set CFRDY GPIO as an input when some other
 245            program sets it as an output */
 246         gpio_set_value(dev->pin, 0);
 247         return 0;               /* success */
 248 }
 249
 250 static int cf_release(struct inode *inode, struct file *filp)
 251 {
 252         int minor = MINOR(inode->i_rdev);
 253         struct cf_mips_dev  *dev=inode->i_bdev->bd_disk->private_data;
 254         spin_lock(&dev->lock);
 255         dev->users--;
 256         spin_unlock(&dev->lock);
 257         return 0;
 258 }
 259
 260 static int cf_ioctl(struct inode *inode, struct file *filp,
 261          unsigned int cmd, unsigned long arg)
 262 {
 263         unsigned minor = MINOR(inode->i_rdev);
 264         struct cf_mips_dev  *dev=inode->i_bdev->bd_disk->private_data;
 265
 266         DEBUGP(KERN_INFO "cf_ioctl cmd %u\n", cmd);
 267         switch (cmd) {
 268         case BLKRRPART: /* re-read partition table */
 269                 if (!capable(CAP_SYS_ADMIN))
 270                         return -EACCES;
 271                 printk(KERN_INFO "cf-mips partition check: \n");
 272                 register_disk(dev->gd);
 273                 return 0;
 274
 275         case HDIO_GETGEO:
 276                 {
 277                         struct hd_geometry geo;
 278                         geo.cylinders = dev->cyl;
 279                         geo.heads = dev->head;
 280                         geo.sectors = dev->spt;
 281                         geo.start = (*dev->gd->part)[minor].start_sect;
 282                         if (copy_to_user((void *) arg, &geo, sizeof (geo)))
 283                                 return -EFAULT;
 284                 }
 285                 return 0;
 286         }
 287
 288         return -EINVAL;         /* unknown command */
 289 }
 290
 291 static void cf_request(request_queue_t * q)
 292 {
 293         struct cf_mips_dev* dev;
 294
 295         struct request * req;
 296         int status;
 297
 298         /* We could have q->queuedata = dev , but haven't yet. */
 299         if (active_req)
 300                 return;
 301
 302         while ((req=elv_next_request(q))!=NULL){
 303                 dev=req->rq_disk->private_data;
 304                 status=cf_transfer(req);
 305                 if (status==CF_TRANS_IN_PROGRESS){
 306                         active_req=req;
 307                         return;
 308                 }
 309                 end_request(req,status);
 310         }
 311 }
 312
 313 static int cf_transfer(const struct request *req)
 314 {
 315         struct cf_mips_dev* dev=req->rq_disk->private_data;
 316
 317         if (!blk_fs_request(req)){
 318                 if (printk_ratelimit())
 319                         printk(KERN_WARNING "cf-mips: skipping non-fs request 0x%x\n",req->cmd[0]);
 320                 return CF_TRANS_FAILED;
 321         }
 322
 323         return cf_do_transfer(dev,req->sector,req->current_nr_sectors,req->buffer,rq_data_dir(req));
 324 }
 325
 326 void cf_async_trans_done(struct cf_mips_dev * dev,int result)
 327 {
 328         struct request *req;
 329
 330         spin_lock(&dev->lock);
 331         req=active_req;
 332         active_req=NULL;
 333         end_request(req,result);
 334         spin_unlock(&dev->lock);
 335
 336         spin_lock(&dev->lock);
 337         cf_request(dev->queue);
 338         spin_unlock(&dev->lock);
 339 }
 340