drivers/ide/ide-4drives.c

   1
   2 #include <linux/kernel.h>
   3 #include <linux/init.h>
   4 #include <linux/module.h>
   5 #include <linux/ide.h>
   6
   7 #define DRV_NAME "ide-4drives"
   8
   9 static bool probe_4drives;
  10
  11 module_param_named(probe, probe_4drives, bool, 0);
  12 MODULE_PARM_DESC(probe, "probe for generic IDE chipset with 4 drives/port");
  13
  14 static void ide_4drives_init_dev(ide_drive_t *drive)
  15 {
  16         if (drive->hwif->channel)
  17                 drive->select ^= 0x20;
  18 }
  19
  20 static const struct ide_port_ops ide_4drives_port_ops = {
  21         .init_dev               = ide_4drives_init_dev,
  22 };
  23
  24 static const struct ide_port_info ide_4drives_port_info = {
  25         .port_ops               = &ide_4drives_port_ops,
  26         .host_flags             = IDE_HFLAG_SERIALIZE | IDE_HFLAG_NO_DMA |
  27                                   IDE_HFLAG_4DRIVES,
  28         .chipset                = ide_4drives,
  29 };
  30
  31 static int __init ide_4drives_init(void)
  32 {
  33         unsigned long base = 0x1f0, ctl = 0x3f6;
  34         struct ide_hw hw, *hws[] = { &hw, &hw };
  35
  36         if (probe_4drives == 0)
  37                 return -ENODEV;
  38
  39         if (!request_region(base, 8, DRV_NAME)) {
  40                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
  41                                 DRV_NAME, base, base + 7);
  42                 return -EBUSY;
  43         }
  44
  45         if (!request_region(ctl, 1, DRV_NAME)) {
  46                 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
  47                                 DRV_NAME, ctl);
  48                 release_region(base, 8);
  49                 return -EBUSY;
  50         }
  51
  52         memset(&hw, 0, sizeof(hw));
  53
  54         ide_std_init_ports(&hw, base, ctl);
  55         hw.irq = 14;
  56
  57         return ide_host_add(&ide_4drives_port_info, hws, 2, NULL);
  58 }
  59
  60 module_init(ide_4drives_init);
  61
  62 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
  63 MODULE_DESCRIPTION("generic IDE chipset with 4 drives/port support");
  64 MODULE_LICENSE("GPL");