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