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