Merge branch 'linus' into core/generic-dma-coherent
[linux-2.6] / drivers / ide / ide-generic.c
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
25 static int probe_mask = 0x03;
26 module_param(probe_mask, int, 0);
27 MODULE_PARM_DESC(probe_mask, "probe mask for legacy ISA IDE ports");
28
29 static 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
58 static struct class_attribute ide_generic_class_attrs[] = {
59         __ATTR(add, S_IWUSR, NULL, store_add),
60         __ATTR_NULL
61 };
62
63 static void ide_generic_class_release(struct class *cls)
64 {
65         kfree(cls);
66 }
67
68 static 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
91 static 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
151 module_init(ide_generic_init);
152
153 MODULE_LICENSE("GPL");