drivers/ide/ide-4drives.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 #include <linux/kernel.h>
   4 #include <linux/init.h>
   5 #include <linux/module.h>
   6 #include <linux/ide.h>
   7
   8 #define DRV_NAME "ide-4drives"
   9
  10 static bool probe_4drives;
  11
  12 module_param_named(probe, probe_4drives, bool, 0);
  13 MODULE_PARM_DESC(probe, "probe for generic IDE chipset with 4 drives/port");
  14
  15 static void ide_4drives_init_dev(ide_drive_t *drive)
  16 {
  17         if (drive->hwif->channel)
  18                 drive->select ^= 0x20;
  19 }
  20
  21 static const struct ide_port_ops ide_4drives_port_ops = {
  22         .init_dev               = ide_4drives_init_dev,
  23 };
  24
  25 static const struct ide_port_info ide_4drives_port_info = {
  26         .port_ops               = &ide_4drives_port_ops,
  27         .host_flags             = IDE_HFLAG_SERIALIZE | IDE_HFLAG_NO_DMA |
  28                                   IDE_HFLAG_4DRIVES,
  29         .chipset                = ide_4drives,
  30 };
  31
  32 static int __init ide_4drives_init(void)
  33 {
  34         unsigned long base = 0x1f0, ctl = 0x3f6;
  35         struct ide_hw hw, *hws[] = { &hw, &hw };
  36
  37         if (probe_4drives == 0)
  38                 return -ENODEV;
  39
  40         if (!request_region(base, 8, DRV_NAME)) {
  41                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
  42                                 DRV_NAME, base, base + 7);
  43                 return -EBUSY;
  44         }
  45
  46         if (!request_region(ctl, 1, DRV_NAME)) {
  47                 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
  48                                 DRV_NAME, ctl);
  49                 release_region(base, 8);
  50                 return -EBUSY;
  51         }
  52
  53         memset(&hw, 0, sizeof(hw));
  54
  55         ide_std_init_ports(&hw, base, ctl);
  56         hw.irq = 14;
  57
  58         return ide_host_add(&ide_4drives_port_info, hws, 2, NULL);
  59 }
  60
  61 module_init(ide_4drives_init);
  62
  63 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
  64 MODULE_DESCRIPTION("generic IDE chipset with 4 drives/port support");
  65 MODULE_LICENSE("GPL");