target/linux/adm5120/files/drivers/block/rb1xx/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/mach-adm5120/adm5120_cf.h>
  27
  28 #ifdef DEBUG
  29 #define DEBUGP printk
  30 #define DLEVEL 1
  31 #else
  32 #define DEBUGP(format, args...)
  33 #define DLEVEL 0
  34 #endif
  35
  36 #define CF_MIPS_MAJOR 13
  37 #define MAJOR_NR        CF_MIPS_MAJOR
  38 #define CF_MAX_PART     16              /* max 15 partitions */
  39
  40 #include "ata.h"
  41
  42 //extern struct block_device_operations cf_bdops;
  43
  44 // static struct hd_struct cf_parts[CF_MAX_PART];
  45 // static int cf_part_sizes[CF_MAX_PART];
  46 // static int cf_hsect_sizes[CF_MAX_PART];
  47 // static int cf_max_sectors[CF_MAX_PART];
  48 // static int cf_blksize_sizes[CF_MAX_PART];
  49
  50 // static spinlock_t lock = SPIN_LOCK_UNLOCKED;
  51
  52 // volatile int cf_busy = 0;
  53
  54 static struct request *active_req = NULL;
  55
  56 static int cf_open (struct inode *, struct file *);
  57 static int cf_release (struct inode *, struct file *);
  58 static int cf_ioctl (struct inode *, struct file *, unsigned, unsigned long);
  59
  60 static void cf_request(request_queue_t * q);
  61 static int cf_transfer(const struct request *req);
  62
  63 /*long (*unlocked_ioctl) (struct file *, unsigned, unsigned long);
  64 long (*compat_ioctl) (struct file *, unsigned, unsigned long);*/
  65 // int (*direct_access) (struct block_device *, sector_t, unsigned long *);
  66 // int (*media_changed) (struct gendisk *);
  67 // int (*revalidate_disk) (struct gendisk *);
  68
  69 static struct block_device_operations cf_bdops = {
  70       .owner = THIS_MODULE,
  71       .open = cf_open,
  72       .release = cf_release,
  73       .ioctl = cf_ioctl,
  74       .media_changed = NULL,
  75       .unlocked_ioctl = NULL,
  76       .revalidate_disk = NULL,
  77       .compat_ioctl = NULL,
  78       .direct_access = NULL
  79 };
  80
  81
  82 int cf_mips_probe(struct platform_device *pdev)
  83 {
  84         struct gendisk* cf_gendisk=NULL;
  85         struct cf_device *cdev = (struct cf_device *) pdev->dev.platform_data;
  86         struct cf_mips_dev *dev;
  87         struct resource *r;
  88         int reg_result;
  89
  90         reg_result = register_blkdev(MAJOR_NR, "cf-mips");
  91         if (reg_result < 0) {
  92                 printk(KERN_WARNING "cf-mips: can't get major %d\n", MAJOR_NR);
  93                 return reg_result;
  94         }
  95
  96         dev = (struct cf_mips_dev *)kzalloc(sizeof(struct cf_mips_dev),GFP_KERNEL);
  97         if (!dev)
  98                 goto out_err;
  99
 100         cdev->dev = dev;
 101
 102         dev->pin = cdev->gpio_pin;
 103         dev->irq = platform_get_irq_byname(pdev, "cf_irq");
 104         r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cf_membase");
 105         dev->base = (void *) r->start;
 106
 107         if (cf_init(dev))
 108                 goto out_err;
 109         printk(KERN_INFO "cf-mips: init done");
 110
 111         spin_lock_init(&dev->lock);
 112         dev->queue = blk_init_queue(cf_request,&dev->lock);
 113         if (!dev->queue){
 114                 printk(KERN_ERR "cf-mips: no mem for queue\n");
 115                 goto out_err;
 116         }
 117         blk_queue_max_sectors(dev->queue,ATA_MAX_SECT_PER_CMD);
 118
 119         /* For memory devices, it is always better to avoid crossing segments
 120         inside the same request. */
 121 /*      if (dev->dtype==0x848A){
 122                 printk(KERN_INFO "Setting boundary for cf to 0x%x",(dev->block_size*512)-1);
 123                 blk_queue_segment_boundary(dev->queue, (dev->block_size*512)-1);
 124         }*/
 125
 126         dev->gd = alloc_disk(CF_MAX_PART);
 127         cf_gendisk = dev->gd;
 128         cdev->gd = dev->gd;
 129
 130         if (!cf_gendisk)
 131                 goto out_err; /* Last of these goto's */
 132
 133         cf_gendisk->major = MAJOR_NR;
 134         cf_gendisk->first_minor = 0;
 135         cf_gendisk->queue=dev->queue;
 136         BUG_ON(cf_gendisk->minors != CF_MAX_PART);
 137         strcpy(cf_gendisk->disk_name,"cfa");
 138         cf_gendisk->fops = &cf_bdops;
 139         cf_gendisk->flags = 0 ; /* is not yet GENHD_FL_REMOVABLE */
 140         cf_gendisk->private_data=dev;
 141
 142         set_capacity(cf_gendisk,dev->sectors * CF_KERNEL_MUL);
 143
 144         /* Let the disk go live */
 145         add_disk(cf_gendisk);
 146 #if 0
 147         result = cf_init();
 148
 149         /* default cfg for all partitions */
 150         memset(cf_parts, 0, sizeof (cf_parts[0]) * CF_MAX_PART);
 151         memset(cf_part_sizes, 0, sizeof (cf_part_sizes[0]) * CF_MAX_PART);
 152         for (i = 0; i < CF_MAX_PART; ++i) {
 153                 cf_hsect_sizes[i] = CF_SECT_SIZE;
 154                 cf_max_sectors[i] = ATA_MAX_SECT_PER_CMD;
 155                 cf_blksize_sizes[i] = BLOCK_SIZE;
 156         }
 157
 158         /* setup info for whole disk (partition 0) */
 159         cf_part_sizes[0] = cf_sectors / 2;
 160         cf_parts[0].nr_sects = cf_sectors;
 161
 162         blk_size[MAJOR_NR] = cf_part_sizes;
 163         blksize_size[MAJOR_NR] = cf_blksize_sizes;
 164         max_sectors[MAJOR_NR] = cf_max_sectors;
 165         hardsect_size[MAJOR_NR] = cf_hsect_sizes;
 166         read_ahead[MAJOR_NR] = 8;       /* (4kB) */
 167
 168         blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
 169
 170         add_gendisk(&cf_gendisk);
 171 #endif
 172 //      printk(KERN_INFO "cf-mips partition check: \n");
 173 //      register_disk(cf_gendisk, MKDEV(MAJOR_NR, 0), CF_MAX_PART,
 174 //                    &cf_bdops, dev->sectors);
 175         return 0;
 176
 177 out_err:
 178         if (dev->queue){
 179                 blk_cleanup_queue(dev->queue);
 180         }
 181         if (reg_result) {
 182                 unregister_blkdev(MAJOR_NR, "cf-mips");
 183                 return reg_result;
 184         }
 185         if (dev){
 186                 cf_cleanup(dev);
 187                 kfree(dev);
 188         }
 189         return 1;
 190 }
 191
 192 static int
 193 cf_mips_remove(struct platform_device *pdev)
 194 {
 195         struct cf_device *cdev = (struct cf_device *) pdev->dev.platform_data;
 196         struct cf_mips_dev *dev = (struct cf_mips_dev *) cdev->dev;
 197
 198         unregister_blkdev(MAJOR_NR, "cf-mips");
 199         blk_cleanup_queue(dev->queue);
 200
 201         del_gendisk(dev->gd);
 202         cf_cleanup(dev);
 203         return 0;
 204 }
 205
 206
 207 static struct platform_driver cf_driver = {
 208         .driver.name = "rb153-cf",
 209         .probe = cf_mips_probe,
 210         .remove = cf_mips_remove,
 211 };
 212
 213 static int __init cf_mips_init(void)
 214 {
 215         printk(KERN_INFO "cf-mips module loaded\n");
 216         return platform_driver_register(&cf_driver);
 217 }
 218
 219 static void cf_mips_cleanup(void)
 220 {
 221         platform_driver_unregister(&cf_driver);
 222         printk(KERN_INFO "cf-mips module removed\n");
 223 }
 224
 225 module_init(cf_mips_init);
 226 module_exit(cf_mips_cleanup);
 227
 228 MODULE_LICENSE("GPL");
 229 MODULE_ALIAS_BLOCKDEV_MAJOR(CF_MIPS_MAJOR);
 230
 231
 232 static int cf_open(struct inode *inode, struct file *filp)
 233 {
 234         struct cf_mips_dev  *dev=inode->i_bdev->bd_disk->private_data;
 235         int minor = MINOR(inode->i_rdev);
 236
 237         if (minor >= CF_MAX_PART)
 238                 return -ENODEV;
 239         //DEBUGP(KERN_INFO "cf-mips module opened, minor %d\n", minor);
 240         spin_lock(&dev->lock);
 241         dev->users++;
 242         spin_unlock(&dev->lock);
 243         filp->private_data=dev;
 244
 245         /* dirty workaround to set CFRDY GPIO as an input when some other
 246            program sets it as an output */
 247         //gpio_set(CFG, (1 << dev->pin), 0);
 248         return 0;               /* success */
 249 }
 250
 251 static int cf_release(struct inode *inode, struct file *filp)
 252 {
 253         int minor = MINOR(inode->i_rdev);
 254         struct cf_mips_dev  *dev=inode->i_bdev->bd_disk->private_data;
 255         spin_lock(&dev->lock);
 256         dev->users--;
 257         spin_unlock(&dev->lock);
 258         return 0;
 259 }
 260
 261 static int cf_ioctl(struct inode *inode, struct file *filp,
 262          unsigned int cmd, unsigned long arg)
 263 {
 264         unsigned minor = MINOR(inode->i_rdev);
 265         struct cf_mips_dev  *dev=inode->i_bdev->bd_disk->private_data;
 266
 267         DEBUGP(KERN_INFO "cf_ioctl cmd %u\n", cmd);
 268         switch (cmd) {
 269         case BLKRRPART: /* re-read partition table */
 270                 if (!capable(CAP_SYS_ADMIN))
 271                         return -EACCES;
 272                 printk(KERN_INFO "cf-mips partition check: \n");
 273                 register_disk(dev->gd);
 274                 return 0;
 275
 276         case HDIO_GETGEO:
 277                 {
 278                         struct hd_geometry geo;
 279                         geo.cylinders = dev->cyl;
 280                         geo.heads = dev->head;
 281                         geo.sectors = dev->spt;
 282                         geo.start = (*dev->gd->part)[minor].start_sect;
 283                         if (copy_to_user((void *) arg, &geo, sizeof (geo)))
 284                                 return -EFAULT;
 285                 }
 286                 return 0;
 287         }
 288
 289         return -EINVAL;         /* unknown command */
 290 }
 291
 292 static void cf_request(request_queue_t * q)
 293 {
 294         struct cf_mips_dev* dev;
 295
 296         struct request * req;
 297         int status;
 298
 299         /* We could have q->queuedata = dev , but haven't yet. */
 300         if (active_req)
 301                 return;
 302
 303         while ((req=elv_next_request(q))!=NULL){
 304                 dev=req->rq_disk->private_data;
 305                 status=cf_transfer(req);
 306                 if (status==CF_TRANS_IN_PROGRESS){
 307                         active_req=req;
 308                         return;
 309                 }
 310                 end_request(req,status);
 311         }
 312 }
 313
 314 static int cf_transfer(const struct request *req)
 315 {
 316         struct cf_mips_dev* dev=req->rq_disk->private_data;
 317
 318         if (!blk_fs_request(req)){
 319                 if (printk_ratelimit())
 320                         printk(KERN_WARNING "cf-mips: skipping non-fs request 0x%x\n",req->cmd[0]);
 321                 return CF_TRANS_FAILED;
 322         }
 323
 324         return cf_do_transfer(dev,req->sector,req->current_nr_sectors,req->buffer,rq_data_dir(req));
 325 }
 326
 327 void cf_async_trans_done(struct cf_mips_dev * dev,int result)
 328 {
 329         struct request *req;
 330
 331         spin_lock(&dev->lock);
 332         req=active_req;
 333         active_req=NULL;
 334         end_request(req,result);
 335         spin_unlock(&dev->lock);
 336
 337         spin_lock(&dev->lock);
 338         cf_request(dev->queue);
 339         spin_unlock(&dev->lock);
 340 }
 341