target/linux/rb532-2.6/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
  27 #include <asm/rc32434/rb.h>
  28
  29 #ifdef DEBUG
  30 #define DEBUGP printk
  31 #define DLEVEL 1
  32 #else
  33 #define DEBUGP(format, args...)
  34 #define DLEVEL 0
  35 #endif
  36
  37 #define CF_MIPS_MAJOR 13
  38 #define MAJOR_NR        CF_MIPS_MAJOR
  39 #define CF_MAX_PART     16              /* max 15 partitions */
  40
  41 #include "ata.h"
  42
  43 //extern struct block_device_operations cf_bdops;
  44
  45 // static struct hd_struct cf_parts[CF_MAX_PART];
  46 // static int cf_part_sizes[CF_MAX_PART];
  47 // static int cf_hsect_sizes[CF_MAX_PART];
  48 // static int cf_max_sectors[CF_MAX_PART];
  49 // static int cf_blksize_sizes[CF_MAX_PART];
  50
  51 // static spinlock_t lock = SPIN_LOCK_UNLOCKED;
  52
  53 // volatile int cf_busy = 0;
  54
  55 static struct request *active_req = NULL;
  56
  57 static int cf_open (struct inode *, struct file *);
  58 static int cf_release (struct inode *, struct file *);
  59 static int cf_ioctl (struct inode *, struct file *, unsigned, unsigned long);
  60
  61 static void cf_request(request_queue_t * q);
  62 static int cf_transfer(const struct request *req);
  63
  64 /*long (*unlocked_ioctl) (struct file *, unsigned, unsigned long);
  65 long (*compat_ioctl) (struct file *, unsigned, unsigned long);*/
  66 // int (*direct_access) (struct block_device *, sector_t, unsigned long *);
  67 // int (*media_changed) (struct gendisk *);
  68 // int (*revalidate_disk) (struct gendisk *);
  69
  70 static struct block_device_operations cf_bdops = {
  71       .owner = THIS_MODULE,
  72       .open = cf_open,
  73       .release = cf_release,
  74       .ioctl = cf_ioctl,
  75       .media_changed = NULL,
  76       .unlocked_ioctl = NULL,
  77       .revalidate_disk = NULL,
  78       .compat_ioctl = NULL,
  79       .direct_access = NULL
  80 };
  81
  82
  83 int cf_mips_probe(struct platform_device *pdev)
  84 {
  85         struct gendisk* cf_gendisk=NULL;
  86         struct cf_device *cdev = (struct cf_device *) pdev->dev.platform_data;
  87         struct cf_mips_dev *dev;
  88         struct resource *r;
  89         int reg_result;
  90
  91         reg_result = register_blkdev(MAJOR_NR, "cf-mips");
  92         if (reg_result < 0) {
  93                 printk(KERN_WARNING "cf-mips: can't get major %d\n", MAJOR_NR);
  94                 return reg_result;
  95         }
  96
  97         dev = (struct cf_mips_dev *)kmalloc(sizeof(struct cf_mips_dev),GFP_KERNEL);
  98         if (!dev)
  99                 goto out_err;
 100         memset(dev, 0, sizeof(struct cf_mips_dev));
 101         cdev->dev = dev;
 102
 103         dev->pin = cdev->gpio_pin;
 104         dev->irq = platform_get_irq_byname(pdev, "cf_irq");
 105         r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cf_membase");
 106         dev->base = (void *) r->start;
 107
 108         if (cf_init(dev)) goto out_err;
 109         printk("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         if (!cf_gendisk) goto out_err; /* Last of these goto's */
 130
 131         cf_gendisk->major = MAJOR_NR;
 132         cf_gendisk->first_minor = 0;
 133         cf_gendisk->queue=dev->queue;
 134         BUG_ON(cf_gendisk->minors != CF_MAX_PART);
 135         strcpy(cf_gendisk->disk_name,"cfa");
 136         cf_gendisk->fops = &cf_bdops;
 137         cf_gendisk->flags = 0 ; /* is not yet GENHD_FL_REMOVABLE */
 138         cf_gendisk->private_data=dev;
 139
 140         set_capacity(cf_gendisk,dev->sectors * CF_KERNEL_MUL);
 141
 142         /* Let the disk go live */
 143         add_disk(cf_gendisk);
 144 #if 0
 145         result = cf_init();
 146
 147         /* default cfg for all partitions */
 148         memset(cf_parts, 0, sizeof (cf_parts[0]) * CF_MAX_PART);
 149         memset(cf_part_sizes, 0, sizeof (cf_part_sizes[0]) * CF_MAX_PART);
 150         for (i = 0; i < CF_MAX_PART; ++i) {
 151                 cf_hsect_sizes[i] = CF_SECT_SIZE;
 152                 cf_max_sectors[i] = ATA_MAX_SECT_PER_CMD;
 153                 cf_blksize_sizes[i] = BLOCK_SIZE;
 154         }
 155
 156         /* setup info for whole disk (partition 0) */
 157         cf_part_sizes[0] = cf_sectors / 2;
 158         cf_parts[0].nr_sects = cf_sectors;
 159
 160         blk_size[MAJOR_NR] = cf_part_sizes;
 161         blksize_size[MAJOR_NR] = cf_blksize_sizes;
 162         max_sectors[MAJOR_NR] = cf_max_sectors;
 163         hardsect_size[MAJOR_NR] = cf_hsect_sizes;
 164         read_ahead[MAJOR_NR] = 8;       /* (4kB) */
 165
 166         blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
 167
 168         add_gendisk(&cf_gendisk);
 169 #endif
 170 //      printk(KERN_INFO "cf-mips partition check: \n");
 171 //      register_disk(cf_gendisk, MKDEV(MAJOR_NR, 0), CF_MAX_PART,
 172 //                    &cf_bdops, dev->sectors);
 173         return 0;
 174
 175 out_err:
 176         if (dev->queue){
 177                 blk_cleanup_queue(dev->queue);
 178         }
 179         if (reg_result) {
 180                 unregister_blkdev(MAJOR_NR, "cf-mips");
 181                 return reg_result;
 182         }
 183         if (dev){
 184                 cf_cleanup(dev);
 185                 kfree(dev);
 186         }
 187         return 1;
 188 }
 189
 190 static int
 191 cf_mips_remove(struct platform_device *pdev)
 192 {
 193         struct cf_device *cdev = (struct cf_device *) pdev->dev.platform_data;
 194         struct cf_mips_dev *dev = (struct cf_mips_dev *) cdev->dev;
 195
 196         unregister_blkdev(MAJOR_NR, "cf-mips");
 197         blk_cleanup_queue(dev->queue);
 198
 199         del_gendisk(dev->gd);
 200         cf_cleanup(dev);
 201         return 0;
 202 }
 203
 204
 205 static struct platform_driver cf_driver = {
 206         .driver.name = "rb500-cf",
 207         .probe = cf_mips_probe,
 208         .remove = cf_mips_remove,
 209 };
 210
 211 static int __init cf_mips_init(void)
 212 {
 213         printk(KERN_INFO "cf-mips module loaded\n");
 214         return platform_driver_register(&cf_driver);
 215 }
 216
 217 static void cf_mips_cleanup(void)
 218 {
 219         platform_driver_unregister(&cf_driver);
 220         printk(KERN_INFO "cf-mips module removed\n");
 221 }
 222
 223 module_init(cf_mips_init);
 224 module_exit(cf_mips_cleanup);
 225
 226 MODULE_LICENSE("GPL");
 227 MODULE_ALIAS_BLOCKDEV_MAJOR(CF_MIPS_MAJOR);
 228
 229
 230 static int cf_open(struct inode *inode, struct file *filp)
 231 {
 232         struct cf_mips_dev  *dev=inode->i_bdev->bd_disk->private_data;
 233         int minor = MINOR(inode->i_rdev);
 234
 235         if (minor >= CF_MAX_PART)
 236                 return -ENODEV;
 237         //DEBUGP(KERN_INFO "cf-mips module opened, minor %d\n", minor);
 238         spin_lock(&dev->lock);
 239         dev->users++;
 240         spin_unlock(&dev->lock);
 241         filp->private_data=dev;
 242
 243         /* dirty workaround to set CFRDY GPIO as an input when some other
 244            program sets it as an output */
 245         gpio_set(CFG, (1 << dev->pin), 0);
 246         return 0;               /* success */
 247 }
 248
 249 static int cf_release(struct inode *inode, struct file *filp)
 250 {
 251         int minor = MINOR(inode->i_rdev);
 252         struct cf_mips_dev  *dev=inode->i_bdev->bd_disk->private_data;
 253         spin_lock(&dev->lock);
 254         dev->users--;
 255         spin_unlock(&dev->lock);
 256         return 0;
 257 }
 258
 259 static int cf_ioctl(struct inode *inode, struct file *filp,
 260          unsigned int cmd, unsigned long arg)
 261 {
 262         unsigned minor = MINOR(inode->i_rdev);
 263         struct cf_mips_dev  *dev=inode->i_bdev->bd_disk->private_data;
 264
 265         DEBUGP(KERN_INFO "cf_ioctl cmd %u\n", cmd);
 266         switch (cmd) {
 267         case BLKRRPART: /* re-read partition table */
 268                 if (!capable(CAP_SYS_ADMIN))
 269                         return -EACCES;
 270                 printk(KERN_INFO "cf-mips partition check: \n");
 271                 register_disk(dev->gd);
 272                 return 0;
 273
 274         case HDIO_GETGEO:
 275                 {
 276                         struct hd_geometry geo;
 277                         geo.cylinders = dev->cyl;
 278                         geo.heads = dev->head;
 279                         geo.sectors = dev->spt;
 280                         geo.start = (*dev->gd->part)[minor].start_sect;
 281                         if (copy_to_user((void *) arg, &geo, sizeof (geo)))
 282                                 return -EFAULT;
 283                 }
 284                 return 0;
 285         }
 286
 287         return -EINVAL;         /* unknown command */
 288 }
 289
 290 static void cf_request(request_queue_t * q)
 291 {
 292         struct cf_mips_dev* dev;
 293
 294         struct request * req;
 295         int status;
 296
 297         /* We could have q->queuedata = dev , but haven't yet. */
 298         if (active_req)
 299                 return;
 300
 301         while ((req=elv_next_request(q))!=NULL){
 302                 dev=req->rq_disk->private_data;
 303                 status=cf_transfer(req);
 304                 if (status==CF_TRANS_IN_PROGRESS){
 305                         active_req=req;
 306                         return;
 307                 }
 308                 end_request(req,status);
 309         }
 310 }
 311
 312 static int cf_transfer(const struct request *req)
 313 {
 314         struct cf_mips_dev* dev=req->rq_disk->private_data;
 315
 316         if (!blk_fs_request(req)){
 317                 if (printk_ratelimit())
 318                         printk(KERN_WARNING "cf-mips: skipping non-fs request 0x%x\n",req->cmd[0]);
 319                 return CF_TRANS_FAILED;
 320         }
 321
 322         return cf_do_transfer(dev,req->sector,req->current_nr_sectors,req->buffer,rq_data_dir(req));
 323 }
 324
 325 void cf_async_trans_done(struct cf_mips_dev * dev,int result)
 326 {
 327         struct request *req;
 328
 329         spin_lock(&dev->lock);
 330         req=active_req;
 331         active_req=NULL;
 332         end_request(req,result);
 333         spin_unlock(&dev->lock);
 334
 335         spin_lock(&dev->lock);
 336         cf_request(dev->queue);
 337         spin_unlock(&dev->lock);
 338 }
 339