root/drivers/ide/ide-generic.c

DEFINITIONS

1. ide_generic_check_pci_legacy_iobases
2. ide_generic_init

   1 /*
   2  * generic/default IDE host driver
   3  *
   4  * Copyright (C) 2004, 2008-2009 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 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <linux/module.h>
  13 #include <linux/ide.h>
  14 #include <linux/pci_ids.h>
  15 
  16 /* FIXME: convert arm to use ide_platform host driver */
  17 #ifdef CONFIG_ARM
  18 #include <asm/irq.h>
  19 #endif
  20 
  21 #define DRV_NAME        "ide_generic"
  22 
  23 static int probe_mask;
  24 module_param(probe_mask, int, 0);
  25 MODULE_PARM_DESC(probe_mask, "probe mask for legacy ISA IDE ports");
  26 
  27 static const struct ide_port_info ide_generic_port_info = {
  28         .host_flags             = IDE_HFLAG_NO_DMA,
  29         .chipset                = ide_generic,
  30 };
  31 
  32 #ifdef CONFIG_ARM
  33 static const u16 legacy_bases[] = { 0x1f0 };
  34 static const int legacy_irqs[]  = { IRQ_HARDDISK };
  35 #elif defined(CONFIG_ALPHA)
  36 static const u16 legacy_bases[] = { 0x1f0, 0x170, 0x1e8, 0x168 };
  37 static const int legacy_irqs[]  = { 14, 15, 11, 10 };
  38 #else
  39 static const u16 legacy_bases[] = { 0x1f0, 0x170, 0x1e8, 0x168, 0x1e0, 0x160 };
  40 static const int legacy_irqs[]  = { 14, 15, 11, 10, 8, 12 };
  41 #endif
  42 
  43 static void ide_generic_check_pci_legacy_iobases(int *primary, int *secondary)
  44 {
  45 #ifdef CONFIG_PCI
  46         struct pci_dev *p = NULL;
  47         u16 val;
  48 
  49         for_each_pci_dev(p) {
  50                 if (pci_resource_start(p, 0) == 0x1f0)
  51                         *primary = 1;
  52                 if (pci_resource_start(p, 2) == 0x170)
  53                         *secondary = 1;
  54 
  55                 /* Cyrix CS55{1,2}0 pre SFF MWDMA ATA on the bridge */
  56                 if (p->vendor == PCI_VENDOR_ID_CYRIX &&
  57                     (p->device == PCI_DEVICE_ID_CYRIX_5510 ||
  58                      p->device == PCI_DEVICE_ID_CYRIX_5520))
  59                         *primary = *secondary = 1;
  60 
  61                 /* Intel MPIIX - PIO ATA on non PCI side of bridge */
  62                 if (p->vendor == PCI_VENDOR_ID_INTEL &&
  63                     p->device == PCI_DEVICE_ID_INTEL_82371MX) {
  64                         pci_read_config_word(p, 0x6C, &val);
  65                         if (val & 0x8000) {
  66                                 /* ATA port enabled */
  67                                 if (val & 0x4000)
  68                                         *secondary = 1;
  69                                 else
  70                                         *primary = 1;
  71                         }
  72                 }
  73         }
  74 #endif
  75 }
  76 
  77 static int __init ide_generic_init(void)
  78 {
  79         struct ide_hw hw, *hws[] = { &hw };
  80         unsigned long io_addr;
  81         int i, rc = 0, primary = 0, secondary = 0;
  82 
  83         ide_generic_check_pci_legacy_iobases(&primary, &secondary);
  84 
  85         if (!probe_mask) {
  86                 printk(KERN_INFO DRV_NAME ": please use \"probe_mask=0x3f\" "
  87                      "module parameter for probing all legacy ISA IDE ports\n");
  88 
  89                 if (primary == 0)
  90                         probe_mask |= 0x1;
  91 
  92                 if (secondary == 0)
  93                         probe_mask |= 0x2;
  94         } else
  95                 printk(KERN_INFO DRV_NAME ": enforcing probing of I/O ports "
  96                         "upon user request\n");
  97 
  98         for (i = 0; i < ARRAY_SIZE(legacy_bases); i++) {
  99                 io_addr = legacy_bases[i];
 100 
 101                 if ((probe_mask & (1 << i)) && io_addr) {
 102                         if (!request_region(io_addr, 8, DRV_NAME)) {
 103                                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX "
 104                                                 "not free.\n",
 105                                                 DRV_NAME, io_addr, io_addr + 7);
 106                                 rc = -EBUSY;
 107                                 continue;
 108                         }
 109 
 110                         if (!request_region(io_addr + 0x206, 1, DRV_NAME)) {
 111                                 printk(KERN_ERR "%s: I/O resource 0x%lX "
 112                                                 "not free.\n",
 113                                                 DRV_NAME, io_addr + 0x206);
 114                                 release_region(io_addr, 8);
 115                                 rc = -EBUSY;
 116                                 continue;
 117                         }
 118 
 119                         memset(&hw, 0, sizeof(hw));
 120                         ide_std_init_ports(&hw, io_addr, io_addr + 0x206);
 121 #ifdef CONFIG_IA64
 122                         hw.irq = isa_irq_to_vector(legacy_irqs[i]);
 123 #else
 124                         hw.irq = legacy_irqs[i];
 125 #endif
 126                         rc = ide_host_add(&ide_generic_port_info, hws, 1, NULL);
 127                         if (rc) {
 128                                 release_region(io_addr + 0x206, 1);
 129                                 release_region(io_addr, 8);
 130                         }
 131                 }
 132         }
 133 
 134         return rc;
 135 }
 136 
 137 module_init(ide_generic_init);
 138 
 139 MODULE_LICENSE("GPL");