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");