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
10static bool probe_4drives;
11
12module_param_named(probe, probe_4drives, bool, 0);
13MODULE_PARM_DESC(probe, "probe for generic IDE chipset with 4 drives/port");
14
15static void ide_4drives_init_dev(ide_drive_t *drive)
16{
17	if (drive->hwif->channel)
18		drive->select ^= 0x20;
19}
20
21static const struct ide_port_ops ide_4drives_port_ops = {
22	.init_dev		= ide_4drives_init_dev,
23};
24
25static 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
32static 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
61module_init(ide_4drives_init);
62
63MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
64MODULE_DESCRIPTION("generic IDE chipset with 4 drives/port support");
65MODULE_LICENSE("GPL");
66