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 *)kmalloc(sizeof(struct cf_mips_dev),GFP_KERNEL);
  97         if (!dev)
  98                 goto out_err;
  99         memset(dev, 0, sizeof(struct cf_mips_dev));
 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)) goto out_err;
 108         printk("init done");
 109
 110         spin_lock_init(&dev->lock);
 111         dev->queue = blk_init_queue(cf_request,&dev->lock);
 112         if (!dev->queue){
 113                 printk(KERN_ERR "cf-mips: no mem for queue\n");
 114                 goto out_err;
 115         }
 116         blk_queue_max_sectors(dev->queue,ATA_MAX_SECT_PER_CMD);
 117
 118         /* For memory devices, it is always better to avoid crossing segments
 119         inside the same request. */
 120 /*      if (dev->dtype==0x848A){
 121                 printk(KERN_INFO "Setting boundary for cf to 0x%x",(dev->block_size*512)-1);
 122                 blk_queue_segment_boundary(dev->queue, (dev->block_size*512)-1);
 123         }*/
 124
 125         dev->gd = alloc_disk(CF_MAX_PART);
 126         cf_gendisk = dev->gd;
 127         cdev->gd = dev->gd;
 128         if (!cf_gendisk) goto out_err; /* Last of these goto's */
 129
 130         cf_gendisk->major = MAJOR_NR;
 131         cf_gendisk->first_minor = 0;
 132         cf_gendisk->queue=dev->queue;
 133         BUG_ON(cf_gendisk->minors != CF_MAX_PART);
 134         strcpy(cf_gendisk->disk_name,"cfa");
 135         cf_gendisk->fops = &cf_bdops;
 136         cf_gendisk->flags = 0 ; /* is not yet GENHD_FL_REMOVABLE */
 137         cf_gendisk->private_data=dev;
 138
 139         set_capacity(cf_gendisk,dev->sectors * CF_KERNEL_MUL);
 140
 141         /* Let the disk go live */
 142         add_disk(cf_gendisk);
 143 #if 0
 144         result = cf_init();
 145
 146         /* default cfg for all partitions */
 147         memset(cf_parts, 0, sizeof (cf_parts[0]) * CF_MAX_PART);
 148         memset(cf_part_sizes, 0, sizeof (cf_part_sizes[0]) * CF_MAX_PART);
 149         for (i = 0; i < CF_MAX_PART; ++i) {
 150                 cf_hsect_sizes[i] = CF_SECT_SIZE;
 151                 cf_max_sectors[i] = ATA_MAX_SECT_PER_CMD;
 152                 cf_blksize_sizes[i] = BLOCK_SIZE;
 153         }
 154
 155         /* setup info for whole disk (partition 0) */
 156         cf_part_sizes[0] = cf_sectors / 2;
 157         cf_parts[0].nr_sects = cf_sectors;
 158
 159         blk_size[MAJOR_NR] = cf_part_sizes;
 160         blksize_size[MAJOR_NR] = cf_blksize_sizes;
 161         max_sectors[MAJOR_NR] = cf_max_sectors;
 162         hardsect_size[MAJOR_NR] = cf_hsect_sizes;
 163         read_ahead[MAJOR_NR] = 8;       /* (4kB) */
 164
 165         blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
 166
 167         add_gendisk(&cf_gendisk);
 168 #endif
 169 //      printk(KERN_INFO "cf-mips partition check: \n");
 170 //      register_disk(cf_gendisk, MKDEV(MAJOR_NR, 0), CF_MAX_PART,
 171 //                    &cf_bdops, dev->sectors);
 172         return 0;
 173
 174 out_err:
 175         if (dev->queue){
 176                 blk_cleanup_queue(dev->queue);
 177         }
 178         if (reg_result) {
 179                 unregister_blkdev(MAJOR_NR, "cf-mips");
 180                 return reg_result;
 181         }
 182         if (dev){
 183                 cf_cleanup(dev);
 184                 kfree(dev);
 185         }
 186         return 1;
 187 }
 188
 189 static int
 190 cf_mips_remove(struct platform_device *pdev)
 191 {
 192         struct cf_device *cdev = (struct cf_device *) pdev->dev.platform_data;
 193         struct cf_mips_dev *dev = (struct cf_mips_dev *) cdev->dev;
 194
 195         unregister_blkdev(MAJOR_NR, "cf-mips");
 196         blk_cleanup_queue(dev->queue);
 197
 198         del_gendisk(dev->gd);
 199         cf_cleanup(dev);
 200         return 0;
 201 }
 202
 203
 204 static struct platform_driver cf_driver = {
 205         .driver.name = "rb153-cf",
 206         .probe = cf_mips_probe,
 207         .remove = cf_mips_remove,
 208 };
 209
 210 static int __init cf_mips_init(void)
 211 {
 212         printk(KERN_INFO "cf-mips module loaded\n");
 213         return platform_driver_register(&cf_driver);
 214 }
 215
 216 static void cf_mips_cleanup(void)
 217 {
 218         platform_driver_unregister(&cf_driver);
 219         printk(KERN_INFO "cf-mips module removed\n");
 220 }
 221
 222 module_init(cf_mips_init);
 223 module_exit(cf_mips_cleanup);
 224
 225 MODULE_LICENSE("GPL");
 226 MODULE_ALIAS_BLOCKDEV_MAJOR(CF_MIPS_MAJOR);
 227
 228
 229 static int cf_open(struct inode *inode, struct file *filp)
 230 {
 231         struct cf_mips_dev  *dev=inode->i_bdev->bd_disk->private_data;
 232         int minor = MINOR(inode->i_rdev);
 233
 234         if (minor >= CF_MAX_PART)
 235                 return -ENODEV;
 236         //DEBUGP(KERN_INFO "cf-mips module opened, minor %d\n", minor);
 237         spin_lock(&dev->lock);
 238         dev->users++;
 239         spin_unlock(&dev->lock);
 240         filp->private_data=dev;
 241
 242         /* dirty workaround to set CFRDY GPIO as an input when some other
 243            program sets it as an output */
 244         //gpio_set(CFG, (1 << dev->pin), 0);
 245         return 0;               /* success */
 246 }
 247
 248 static int cf_release(struct inode *inode, struct file *filp)
 249 {
 250         int minor = MINOR(inode->i_rdev);
 251         struct cf_mips_dev  *dev=inode->i_bdev->bd_disk->private_data;
 252         spin_lock(&dev->lock);
 253         dev->users--;
 254         spin_unlock(&dev->lock);
 255         return 0;
 256 }
 257
 258 static int cf_ioctl(struct inode *inode, struct file *filp,
 259          unsigned int cmd, unsigned long arg)
 260 {
 261         unsigned minor = MINOR(inode->i_rdev);
 262         struct cf_mips_dev  *dev=inode->i_bdev->bd_disk->private_data;
 263
 264         DEBUGP(KERN_INFO "cf_ioctl cmd %u\n", cmd);
 265         switch (cmd) {
 266         case BLKRRPART: /* re-read partition table */
 267                 if (!capable(CAP_SYS_ADMIN))
 268                         return -EACCES;
 269                 printk(KERN_INFO "cf-mips partition check: \n");
 270                 register_disk(dev->gd);
 271                 return 0;
 272
 273         case HDIO_GETGEO:
 274                 {
 275                         struct hd_geometry geo;
 276                         geo.cylinders = dev->cyl;
 277                         geo.heads = dev->head;
 278                         geo.sectors = dev->spt;
 279                         geo.start = (*dev->gd->part)[minor].start_sect;
 280                         if (copy_to_user((void *) arg, &geo, sizeof (geo)))
 281                                 return -EFAULT;
 282                 }
 283                 return 0;
 284         }
 285
 286         return -EINVAL;         /* unknown command */
 287 }
 288
 289 static void cf_request(request_queue_t * q)
 290 {
 291         struct cf_mips_dev* dev;
 292
 293         struct request * req;
 294         int status;
 295
 296         /* We could have q->queuedata = dev , but haven't yet. */
 297         if (active_req)
 298                 return;
 299
 300         while ((req=elv_next_request(q))!=NULL){
 301                 dev=req->rq_disk->private_data;
 302                 status=cf_transfer(req);
 303                 if (status==CF_TRANS_IN_PROGRESS){
 304                         active_req=req;
 305                         return;
 306                 }
 307                 end_request(req,status);
 308         }
 309 }
 310
 311 static int cf_transfer(const struct request *req)
 312 {
 313         struct cf_mips_dev* dev=req->rq_disk->private_data;
 314
 315         if (!blk_fs_request(req)){
 316                 if (printk_ratelimit())
 317                         printk(KERN_WARNING "cf-mips: skipping non-fs request 0x%x\n",req->cmd[0]);
 318                 return CF_TRANS_FAILED;
 319         }
 320
 321         return cf_do_transfer(dev,req->sector,req->current_nr_sectors,req->buffer,rq_data_dir(req));
 322 }
 323
 324 void cf_async_trans_done(struct cf_mips_dev * dev,int result)
 325 {
 326         struct request *req;
 327
 328         spin_lock(&dev->lock);
 329         req=active_req;
 330         active_req=NULL;
 331         end_request(req,result);
 332         spin_unlock(&dev->lock);
 333
 334         spin_lock(&dev->lock);
 335         cf_request(dev->queue);
 336         spin_unlock(&dev->lock);
 337 }
 338