LXR linux/drivers/ide/ide-generic.c

   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
  23static int probe_mask;
  24module_param(probe_mask, int, 0);
  25MODULE_PARM_DESC(probe_mask, "probe mask for legacy ISA IDE ports");
  26
  27static 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
  33static const u16 legacy_bases[] = { 0x1f0 };
  34static const int legacy_irqs[]  = { IRQ_HARDDISK };
  35#elif defined(CONFIG_ALPHA)
  36static const u16 legacy_bases[] = { 0x1f0, 0x170, 0x1e8, 0x168 };
  37static const int legacy_irqs[]  = { 14, 15, 11, 10 };
  38#else
  39static const u16 legacy_bases[] = { 0x1f0, 0x170, 0x1e8, 0x168, 0x1e0, 0x160 };
  40static const int legacy_irqs[]  = { 14, 15, 11, 10, 8, 12 };
  41#endif
  42
  43static 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
  77static 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
 137module_init(ide_generic_init);
 138
 139MODULE_LICENSE("GPL");
 140