ide-generic.c revision 8a69580e1ea9516caada5eed202afd39546e9809 
1/*
2 * generic/default IDE host driver
3 *
4 * Copyright (C) 2004, 2008 Bartlomiej Zolnierkiewicz
5 * This code was split off from ide.c.  See it for original copyrights.
6 *
7 * May be copied or modified under the terms of the GNU General Public License.
8 */
9
10/*
11 * For special cases new interfaces may be added using sysfs, i.e.
12 *
13 *	echo -n "0x168:0x36e:10" > /sys/class/ide_generic/add
14 *
15 * will add an interface using I/O ports 0x168-0x16f/0x36e and IRQ 10.
16 */
17
18#include <linux/kernel.h>
19#include <linux/init.h>
20#include <linux/module.h>
21#include <linux/ide.h>
22
23#define DRV_NAME	"ide_generic"
24
25static int probe_mask = 0x03;
26module_param(probe_mask, int, 0);
27MODULE_PARM_DESC(probe_mask, "probe mask for legacy ISA IDE ports");
28
29static ssize_t store_add(struct class *cls, const char *buf, size_t n)
30{
31	unsigned int base, ctl;
32	int irq, rc;
33	hw_regs_t hw, *hws[] = { &hw, NULL, NULL, NULL };
34
35	if (sscanf(buf, "%x:%x:%d", &base, &ctl, &irq) != 3)
36		return -EINVAL;
37
38	memset(&hw, 0, sizeof(hw));
39	ide_std_init_ports(&hw, base, ctl);
40	hw.irq = irq;
41	hw.chipset = ide_generic;
42
43	rc = ide_host_add(NULL, hws, NULL);
44	if (rc)
45		return rc;
46
47	return n;
48};
49
50static struct class_attribute ide_generic_class_attrs[] = {
51	__ATTR(add, S_IWUSR, NULL, store_add),
52	__ATTR_NULL
53};
54
55static void ide_generic_class_release(struct class *cls)
56{
57	kfree(cls);
58}
59
60static int __init ide_generic_sysfs_init(void)
61{
62	struct class *cls;
63	int rc;
64
65	cls = kzalloc(sizeof(*cls), GFP_KERNEL);
66	if (!cls)
67		return -ENOMEM;
68
69	cls->name = DRV_NAME;
70	cls->owner = THIS_MODULE;
71	cls->class_release = ide_generic_class_release;
72	cls->class_attrs = ide_generic_class_attrs;
73
74	rc = class_register(cls);
75	if (rc) {
76		kfree(cls);
77		return rc;
78	}
79
80	return 0;
81}
82
83static int __init ide_generic_init(void)
84{
85	hw_regs_t hw[MAX_HWIFS], *hws[MAX_HWIFS];
86	struct ide_host *host;
87	unsigned long io_addr;
88	int i, rc;
89
90	printk(KERN_INFO DRV_NAME ": please use \"probe_mask=0x3f\" module "
91			 "parameter for probing all legacy ISA IDE ports\n");
92
93	for (i = 0; i < MAX_HWIFS; i++) {
94		io_addr = ide_default_io_base(i);
95
96		hws[i] = NULL;
97
98		if ((probe_mask & (1 << i)) && io_addr) {
99			if (!request_region(io_addr, 8, DRV_NAME)) {
100				printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX "
101						"not free.\n",
102						DRV_NAME, io_addr, io_addr + 7);
103				continue;
104			}
105
106			if (!request_region(io_addr + 0x206, 1, DRV_NAME)) {
107				printk(KERN_ERR "%s: I/O resource 0x%lX "
108						"not free.\n",
109						DRV_NAME, io_addr + 0x206);
110				release_region(io_addr, 8);
111				continue;
112			}
113
114			memset(&hw[i], 0, sizeof(hw[i]));
115			ide_std_init_ports(&hw[i], io_addr, io_addr + 0x206);
116			hw[i].irq = ide_default_irq(io_addr);
117			hw[i].chipset = ide_generic;
118
119			hws[i] = &hw[i];
120		}
121	}
122
123	host = ide_host_alloc_all(NULL, hws);
124	if (host == NULL) {
125		rc = -ENOMEM;
126		goto err;
127	}
128
129	rc = ide_host_register(host, NULL, hws);
130	if (rc)
131		goto err_free;
132
133	if (ide_generic_sysfs_init())
134		printk(KERN_ERR DRV_NAME ": failed to create ide_generic "
135					 "class\n");
136
137	return 0;
138err_free:
139	ide_host_free(host);
140err:
141	for (i = 0; i < MAX_HWIFS; i++) {
142		if (hws[i] == NULL)
143			continue;
144
145		io_addr = hws[i]->io_ports.data_addr;
146		release_region(io_addr + 0x206, 1);
147		release_region(io_addr, 8);
148	}
149	return rc;
150}
151
152module_init(ide_generic_init);
153
154MODULE_LICENSE("GPL");
155