Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 ide_hwif_t *hwif;
32 unsigned int base, ctl;
33 int irq;
34 hw_regs_t hw;
35 u8 idx[] = { 0xff, 0xff, 0xff, 0xff };
36
37 if (sscanf(buf, "%x:%x:%d", &base, &ctl, &irq) != 3)
38 return -EINVAL;
39
40 hwif = ide_find_port();
41 if (hwif == NULL)
42 return -ENOENT;
43
44 memset(&hw, 0, sizeof(hw));
45 ide_std_init_ports(&hw, base, ctl);
46 hw.irq = irq;
47 hw.chipset = ide_generic;
48
49 ide_init_port_hw(hwif, &hw);
50
51 idx[0] = hwif->index;
52
53 ide_device_add(idx, NULL);
54
55 return n;
56};
57
58static struct class_attribute ide_generic_class_attrs[] = {
59 __ATTR(add, S_IWUSR, NULL, store_add),
60 __ATTR_NULL
61};
62
63static void ide_generic_class_release(struct class *cls)
64{
65 kfree(cls);
66}
67
68static int __init ide_generic_sysfs_init(void)
69{
70 struct class *cls;
71 int rc;
72
73 cls = kzalloc(sizeof(*cls), GFP_KERNEL);
74 if (!cls)
75 return -ENOMEM;
76
77 cls->name = DRV_NAME;
78 cls->owner = THIS_MODULE;
79 cls->class_release = ide_generic_class_release;
80 cls->class_attrs = ide_generic_class_attrs;
81
82 rc = class_register(cls);
83 if (rc) {
84 kfree(cls);
85 return rc;
86 }
87
88 return 0;
89}
90
91static int __init ide_generic_init(void)
92{
93 u8 idx[MAX_HWIFS];
94 int i;
95
96 printk(KERN_INFO DRV_NAME ": please use \"probe_mask=0x3f\" module "
97 "parameter for probing all legacy ISA IDE ports\n");
98
99 for (i = 0; i < MAX_HWIFS; i++) {
100 ide_hwif_t *hwif;
101 unsigned long io_addr = ide_default_io_base(i);
102 hw_regs_t hw;
103
104 idx[i] = 0xff;
105
106 if ((probe_mask & (1 << i)) && io_addr) {
107 if (!request_region(io_addr, 8, DRV_NAME)) {
108 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX "
109 "not free.\n",
110 DRV_NAME, io_addr, io_addr + 7);
111 continue;
112 }
113
114 if (!request_region(io_addr + 0x206, 1, DRV_NAME)) {
115 printk(KERN_ERR "%s: I/O resource 0x%lX "
116 "not free.\n",
117 DRV_NAME, io_addr + 0x206);
118 release_region(io_addr, 8);
119 continue;
120 }
121
122 /*
123 * Skip probing if the corresponding
124 * slot is already occupied.
125 */
126 hwif = ide_find_port();
127 if (hwif == NULL || hwif->index != i) {
128 idx[i] = 0xff;
129 continue;
130 }
131
132 memset(&hw, 0, sizeof(hw));
133 ide_std_init_ports(&hw, io_addr, io_addr + 0x206);
134 hw.irq = ide_default_irq(io_addr);
135 hw.chipset = ide_generic;
136 ide_init_port_hw(hwif, &hw);
137
138 idx[i] = i;
139 }
140 }
141
142 ide_device_add_all(idx, NULL);
143
144 if (ide_generic_sysfs_init())
145 printk(KERN_ERR DRV_NAME ": failed to create ide_generic "
146 "class\n");
147
148 return 0;
149}
150
151module_init(ide_generic_init);
152
153MODULE_LICENSE("GPL");