FreeBSD/Linux Kernel Cross Reference
sys/dev/ata/ata-pci.c

     /*-
      * Copyright (c) 1998 - 2007 Søren Schmidt <sos@FreeBSD.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer,
     *    without modification, immediately at the beginning of the file.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include "opt_ata.h"
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/ata.h>
    #include <sys/bus.h>
    #include <sys/conf.h>
    #include <sys/malloc.h>
    #include <sys/sema.h>
    #include <sys/taskqueue.h>
    #include <vm/uma.h>
    #include <machine/stdarg.h>
    #include <machine/resource.h>
    #include <machine/bus.h>
    #include <sys/rman.h>
    #include <dev/pci/pcivar.h>
    #include <dev/pci/pcireg.h>
    #include <dev/ata/ata-all.h>
    #include <dev/ata/ata-pci.h>
    #include <ata_if.h>
    
    /* local vars */
    static MALLOC_DEFINE(M_ATAPCI, "ata_pci", "ATA driver PCI");
    
    /* misc defines */
    #define IOMASK                  0xfffffffc
    #define ATA_PROBE_OK            -10
    
    int
    ata_legacy(device_t dev)
    {
        return (((pci_read_config(dev, PCIR_PROGIF, 1)&PCIP_STORAGE_IDE_MASTERDEV)&&
                 ((pci_read_config(dev, PCIR_PROGIF, 1) &
                   (PCIP_STORAGE_IDE_MODEPRIM | PCIP_STORAGE_IDE_MODESEC)) !=
                  (PCIP_STORAGE_IDE_MODEPRIM | PCIP_STORAGE_IDE_MODESEC))) ||
                (!pci_read_config(dev, PCIR_BAR(0), 4) &&
                 !pci_read_config(dev, PCIR_BAR(1), 4) &&
                 !pci_read_config(dev, PCIR_BAR(2), 4) &&
                 !pci_read_config(dev, PCIR_BAR(3), 4) &&
                 !pci_read_config(dev, PCIR_BAR(5), 4)));
    }
    
    int
    ata_pci_probe(device_t dev)
    {
        if (pci_get_class(dev) != PCIC_STORAGE)
            return ENXIO;
    
        /* if this is an AHCI chipset grab it */
        if (pci_get_subclass(dev) == PCIS_STORAGE_SATA) {
            if (!ata_ahci_ident(dev))
                return ATA_PROBE_OK;
        }
    
        /* run through the vendor specific drivers */
        switch (pci_get_vendor(dev)) {
        case ATA_ACARD_ID: 
            if (!ata_acard_ident(dev))
                return ATA_PROBE_OK;
            break;
        case ATA_ACER_LABS_ID:
            if (!ata_ali_ident(dev))
                return ATA_PROBE_OK;
            break;
        case ATA_AMD_ID:
            if (!ata_amd_ident(dev))
                return ATA_PROBE_OK;
            break;
        case ATA_ATI_ID:
           if (!ata_ati_ident(dev))
               return ATA_PROBE_OK;
           break;
       case ATA_CYRIX_ID:
           if (!ata_cyrix_ident(dev))
               return ATA_PROBE_OK;
           break;
       case ATA_CYPRESS_ID:
           if (!ata_cypress_ident(dev))
               return ATA_PROBE_OK;
           break;
       case ATA_HIGHPOINT_ID: 
           if (!ata_highpoint_ident(dev))
               return ATA_PROBE_OK;
           break;
       case ATA_INTEL_ID:
           if (!ata_intel_ident(dev))
               return ATA_PROBE_OK;
           break;
       case ATA_ITE_ID:
           if (!ata_ite_ident(dev))
               return ATA_PROBE_OK;
           break;
       case ATA_JMICRON_ID:
           if (!ata_jmicron_ident(dev))
               return ATA_PROBE_OK;
           break;
       case ATA_MARVELL_ID:
           if (!ata_marvell_ident(dev))
               return ATA_PROBE_OK;
           break;
       case ATA_NATIONAL_ID:
           if (!ata_national_ident(dev))
               return ATA_PROBE_OK;
           break;
       case ATA_NETCELL_ID:
           if (!ata_netcell_ident(dev))
               return ATA_PROBE_OK;
           break;
       case ATA_NVIDIA_ID:
           if (!ata_nvidia_ident(dev))
               return ATA_PROBE_OK;
           break;
       case ATA_PROMISE_ID:
           if (!ata_promise_ident(dev))
               return ATA_PROBE_OK;
           break;
       case ATA_SERVERWORKS_ID: 
           if (!ata_serverworks_ident(dev))
               return ATA_PROBE_OK;
           break;
       case ATA_SILICON_IMAGE_ID:
           if (!ata_sii_ident(dev))
               return ATA_PROBE_OK;
           break;
       case ATA_SIS_ID:
           if (!ata_sis_ident(dev))
               return ATA_PROBE_OK;
           break;
       case ATA_VIA_ID: 
           if (!ata_via_ident(dev))
               return ATA_PROBE_OK;
           break;
       case ATA_CENATEK_ID:
           if (pci_get_devid(dev) == ATA_CENATEK_ROCKET) {
               ata_generic_ident(dev);
               device_set_desc(dev, "Cenatek Rocket Drive controller");
               return ATA_PROBE_OK;
           }
           break;
       case ATA_MICRON_ID:
           if (pci_get_devid(dev) == ATA_MICRON_RZ1000 ||
               pci_get_devid(dev) == ATA_MICRON_RZ1001) {
               ata_generic_ident(dev);
               device_set_desc(dev, 
                   "RZ 100? ATA controller !WARNING! data loss/corruption risk");
               return ATA_PROBE_OK;
           }
           break;
       }
   
       /* unknown chipset, try generic DMA if it seems possible */
       if (pci_get_subclass(dev) == PCIS_STORAGE_IDE) {
           if (!ata_generic_ident(dev))
               return ATA_PROBE_OK;
       }
       return ENXIO;
   }
   
   int
   ata_pci_attach(device_t dev)
   {
       struct ata_pci_controller *ctlr = device_get_softc(dev);
       u_int32_t cmd;
       int unit;
   
       /* do chipset specific setups only needed once */
       if (ata_legacy(dev) || pci_read_config(dev, PCIR_BAR(2), 4) & IOMASK)
           ctlr->channels = 2;
       else
           ctlr->channels = 1;
       ctlr->allocate = ata_pci_allocate;
       ctlr->dmainit = ata_pci_dmainit;
       ctlr->dev = dev;
   
       /* if needed try to enable busmastering */
       cmd = pci_read_config(dev, PCIR_COMMAND, 2);
       if (!(cmd & PCIM_CMD_BUSMASTEREN)) {
           pci_write_config(dev, PCIR_COMMAND, cmd | PCIM_CMD_BUSMASTEREN, 2);
           cmd = pci_read_config(dev, PCIR_COMMAND, 2);
       }
   
       /* if busmastering mode "stuck" use it */
       if ((cmd & PCIM_CMD_BUSMASTEREN) == PCIM_CMD_BUSMASTEREN) {
           ctlr->r_type1 = SYS_RES_IOPORT;
           ctlr->r_rid1 = ATA_BMADDR_RID;
           ctlr->r_res1 = bus_alloc_resource_any(dev, ctlr->r_type1, &ctlr->r_rid1,
                                                 RF_ACTIVE);
       }
   
       if (ctlr->chipinit(dev))
           return ENXIO;
   
       /* attach all channels on this controller */
       for (unit = 0; unit < ctlr->channels; unit++) {
           if ((unit == 0 || unit == 1) && ata_legacy(dev)) {
               device_add_child(dev, "ata", unit);
               continue;
           }
           device_add_child(dev, "ata", devclass_find_free_unit(ata_devclass, 2));
       }
       bus_generic_attach(dev);
       return 0;
   }
   
   int
   ata_pci_detach(device_t dev)
   {
       struct ata_pci_controller *ctlr = device_get_softc(dev);
       device_t *children;
       int nchildren, i;
   
       /* detach & delete all children */
       if (!device_get_children(dev, &children, &nchildren)) {
           for (i = 0; i < nchildren; i++)
               device_delete_child(dev, children[i]);
           free(children, M_TEMP);
       }
   
       if (ctlr->r_irq) {
           bus_teardown_intr(dev, ctlr->r_irq, ctlr->handle);
           bus_release_resource(dev, SYS_RES_IRQ, ATA_IRQ_RID, ctlr->r_irq);
       }
       if (ctlr->r_res2)
           bus_release_resource(dev, ctlr->r_type2, ctlr->r_rid2, ctlr->r_res2);
       if (ctlr->r_res1)
           bus_release_resource(dev, ctlr->r_type1, ctlr->r_rid1, ctlr->r_res1);
   
       return 0;
   }
   
   struct resource *
   ata_pci_alloc_resource(device_t dev, device_t child, int type, int *rid,
                          u_long start, u_long end, u_long count, u_int flags)
   {
       struct ata_pci_controller *controller = device_get_softc(dev);
       int unit = ((struct ata_channel *)device_get_softc(child))->unit;
       struct resource *res = NULL;
       int myrid;
   
       if (type == SYS_RES_IOPORT) {
           switch (*rid) {
           case ATA_IOADDR_RID:
               if (ata_legacy(dev)) {
                   start = (unit ? ATA_SECONDARY : ATA_PRIMARY);
                   count = ATA_IOSIZE;
                   end = start + count - 1;
               }
               myrid = PCIR_BAR(0) + (unit << 3);
               res = BUS_ALLOC_RESOURCE(device_get_parent(dev), dev,
                                        SYS_RES_IOPORT, &myrid,
                                        start, end, count, flags);
               break;
   
           case ATA_CTLADDR_RID:
               if (ata_legacy(dev)) {
                   start = (unit ? ATA_SECONDARY : ATA_PRIMARY) + ATA_CTLOFFSET;
                   count = ATA_CTLIOSIZE;
                   end = start + count - 1;
               }
               myrid = PCIR_BAR(1) + (unit << 3);
               res = BUS_ALLOC_RESOURCE(device_get_parent(dev), dev,
                                        SYS_RES_IOPORT, &myrid,
                                        start, end, count, flags);
               break;
           }
       }
       if (type == SYS_RES_IRQ && *rid == ATA_IRQ_RID) {
           if (ata_legacy(dev)) {
               int irq = (unit == 0 ? 14 : 15);
               
               res = BUS_ALLOC_RESOURCE(device_get_parent(dev), child,
                                        SYS_RES_IRQ, rid, irq, irq, 1, flags);
           }
           else
               res = controller->r_irq;
       }
       return res;
   }
   
   int
   ata_pci_release_resource(device_t dev, device_t child, int type, int rid,
                            struct resource *r)
   {
       int unit = ((struct ata_channel *)device_get_softc(child))->unit;
   
       if (type == SYS_RES_IOPORT) {
           switch (rid) {
           case ATA_IOADDR_RID:
               return BUS_RELEASE_RESOURCE(device_get_parent(dev), dev,
                                           SYS_RES_IOPORT,
                                           PCIR_BAR(0) + (unit << 3), r);
               break;
   
           case ATA_CTLADDR_RID:
               return BUS_RELEASE_RESOURCE(device_get_parent(dev), dev,
                                           SYS_RES_IOPORT,
                                           PCIR_BAR(1) + (unit << 3), r);
               break;
           default:
               return ENOENT;
           }
       }
       if (type == SYS_RES_IRQ) {
           if (rid != ATA_IRQ_RID)
               return ENOENT;
   
           if (ata_legacy(dev)) {
               return BUS_RELEASE_RESOURCE(device_get_parent(dev), child,
                                           SYS_RES_IRQ, rid, r);
           }
           else  
               return 0;
       }
       return EINVAL;
   }
   
   int
   ata_pci_setup_intr(device_t dev, device_t child, struct resource *irq, 
                      int flags, driver_filter_t *filter, driver_intr_t *function, 
                      void *argument, void **cookiep)
   {
       if (ata_legacy(dev)) {
           return BUS_SETUP_INTR(device_get_parent(dev), child, irq,
                                 flags, filter, function, argument, cookiep);
       }
       else {
           struct ata_pci_controller *controller = device_get_softc(dev);
           int unit = ((struct ata_channel *)device_get_softc(child))->unit;
   
           if (filter != NULL) {
                   printf("ata-pci.c: we cannot use a filter here\n");
                   return (EINVAL);
           }
           controller->interrupt[unit].function = function;
           controller->interrupt[unit].argument = argument;
           *cookiep = controller;
           return 0;
       }
   }
   
   int
   ata_pci_teardown_intr(device_t dev, device_t child, struct resource *irq,
                         void *cookie)
   {
       if (ata_legacy(dev)) {
           return BUS_TEARDOWN_INTR(device_get_parent(dev), child, irq, cookie);
       }
       else {
           struct ata_pci_controller *controller = device_get_softc(dev);
           int unit = ((struct ata_channel *)device_get_softc(child))->unit;
   
           controller->interrupt[unit].function = NULL;
           controller->interrupt[unit].argument = NULL;
           return 0;
       }
   }
       
   int
   ata_pci_allocate(device_t dev)
   {
       struct ata_pci_controller *ctlr = device_get_softc(device_get_parent(dev));
       struct ata_channel *ch = device_get_softc(dev);
       struct resource *io = NULL, *ctlio = NULL;
       int i, rid;
   
       rid = ATA_IOADDR_RID;
       if (!(io = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &rid, RF_ACTIVE)))
           return ENXIO;
   
       rid = ATA_CTLADDR_RID;
       if (!(ctlio = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &rid,RF_ACTIVE))){
           bus_release_resource(dev, SYS_RES_IOPORT, ATA_IOADDR_RID, io);
           return ENXIO;
       }
   
       for (i = ATA_DATA; i <= ATA_COMMAND; i ++) {
           ch->r_io[i].res = io;
           ch->r_io[i].offset = i;
       }
       ch->r_io[ATA_CONTROL].res = ctlio;
       ch->r_io[ATA_CONTROL].offset = ata_legacy(device_get_parent(dev)) ? 0 : 2;
       ch->r_io[ATA_IDX_ADDR].res = io;
       ata_default_registers(dev);
       if (ctlr->r_res1) {
           for (i = ATA_BMCMD_PORT; i <= ATA_BMDTP_PORT; i++) {
               ch->r_io[i].res = ctlr->r_res1;
               ch->r_io[i].offset = (i - ATA_BMCMD_PORT) + (ch->unit*ATA_BMIOSIZE);
           }
       }
   
       ata_pci_hw(dev);
       return 0;
   }
   
   void
   ata_pci_hw(device_t dev)
   {
       struct ata_channel *ch = device_get_softc(dev);
   
       ata_generic_hw(dev);
       ch->hw.status = ata_pci_status;
   }
   
   int
   ata_pci_status(device_t dev)
   {
       struct ata_channel *ch = device_get_softc(dev);
   
       if ((dumping || !ata_legacy(device_get_parent(dev))) &&
           ch->dma && ((ch->flags & ATA_ALWAYS_DMASTAT) ||
                       (ch->dma->flags & ATA_DMA_ACTIVE))) {
           int bmstat = ATA_IDX_INB(ch, ATA_BMSTAT_PORT) & ATA_BMSTAT_MASK;
   
           if ((bmstat & (ATA_BMSTAT_ACTIVE | ATA_BMSTAT_INTERRUPT)) !=
               ATA_BMSTAT_INTERRUPT)
               return 0;
           ATA_IDX_OUTB(ch, ATA_BMSTAT_PORT, bmstat & ~ATA_BMSTAT_ERROR);
           DELAY(1);
       }
       if (ATA_IDX_INB(ch, ATA_ALTSTAT) & ATA_S_BUSY) {
           DELAY(100);
           if (ATA_IDX_INB(ch, ATA_ALTSTAT) & ATA_S_BUSY)
               return 0;
       }
       return 1;
   }
   
   static int
   ata_pci_dmastart(device_t dev)
   {
       struct ata_channel *ch = device_get_softc(device_get_parent(dev));
   
       ATA_IDX_OUTB(ch, ATA_BMSTAT_PORT, (ATA_IDX_INB(ch, ATA_BMSTAT_PORT) | 
                    (ATA_BMSTAT_INTERRUPT | ATA_BMSTAT_ERROR)));
       ATA_IDX_OUTL(ch, ATA_BMDTP_PORT, ch->dma->sg_bus);
       ch->dma->flags |= ATA_DMA_ACTIVE;
       ATA_IDX_OUTB(ch, ATA_BMCMD_PORT,
                    (ATA_IDX_INB(ch, ATA_BMCMD_PORT) & ~ATA_BMCMD_WRITE_READ) |
                    ((ch->dma->flags & ATA_DMA_READ) ? ATA_BMCMD_WRITE_READ : 0) |
                    ATA_BMCMD_START_STOP);
       return 0;
   }
   
   static int
   ata_pci_dmastop(device_t dev)
   {
       struct ata_channel *ch = device_get_softc(device_get_parent(dev));
       int error;
   
       ATA_IDX_OUTB(ch, ATA_BMCMD_PORT, 
                    ATA_IDX_INB(ch, ATA_BMCMD_PORT) & ~ATA_BMCMD_START_STOP);
       ch->dma->flags &= ~ATA_DMA_ACTIVE;
       error = ATA_IDX_INB(ch, ATA_BMSTAT_PORT) & ATA_BMSTAT_MASK;
       ATA_IDX_OUTB(ch, ATA_BMSTAT_PORT, ATA_BMSTAT_INTERRUPT | ATA_BMSTAT_ERROR);
       return error;
   }
   
   static void
   ata_pci_dmareset(device_t dev)
   {
       struct ata_channel *ch = device_get_softc(dev);
   
       ATA_IDX_OUTB(ch, ATA_BMCMD_PORT, 
                    ATA_IDX_INB(ch, ATA_BMCMD_PORT) & ~ATA_BMCMD_START_STOP);
       ch->dma->flags &= ~ATA_DMA_ACTIVE;
       ATA_IDX_OUTB(ch, ATA_BMSTAT_PORT, ATA_BMSTAT_INTERRUPT | ATA_BMSTAT_ERROR);
       ch->dma->unload(dev);
   }
   
   void
   ata_pci_dmainit(device_t dev)
   {
       struct ata_channel *ch = device_get_softc(dev);
   
       ata_dmainit(dev);
       if (ch->dma) {
           ch->dma->start = ata_pci_dmastart;
           ch->dma->stop = ata_pci_dmastop;
           ch->dma->reset = ata_pci_dmareset;
       }
   }
   
   char *
   ata_pcivendor2str(device_t dev)
   {
       switch (pci_get_vendor(dev)) {
       case ATA_ACARD_ID:          return "Acard";
       case ATA_ACER_LABS_ID:      return "AcerLabs";
       case ATA_AMD_ID:            return "AMD";
       case ATA_ATI_ID:            return "ATI";
       case ATA_CYRIX_ID:          return "Cyrix";
       case ATA_CYPRESS_ID:        return "Cypress";
       case ATA_HIGHPOINT_ID:      return "HighPoint";
       case ATA_INTEL_ID:          return "Intel";
       case ATA_ITE_ID:            return "ITE";
       case ATA_JMICRON_ID:        return "JMicron";
       case ATA_MARVELL_ID:        return "Marvell";
       case ATA_NATIONAL_ID:       return "National";
       case ATA_NETCELL_ID:        return "Netcell";
       case ATA_NVIDIA_ID:         return "nVidia";
       case ATA_PROMISE_ID:        return "Promise";
       case ATA_SERVERWORKS_ID:    return "ServerWorks";
       case ATA_SILICON_IMAGE_ID:  return "SiI";
       case ATA_SIS_ID:            return "SiS";
       case ATA_VIA_ID:            return "VIA";
       case ATA_CENATEK_ID:        return "Cenatek";
       case ATA_MICRON_ID:         return "Micron";
       default:                    return "Generic";
       }
   }
   
   static device_method_t ata_pci_methods[] = {
       /* device interface */
       DEVMETHOD(device_probe,             ata_pci_probe),
       DEVMETHOD(device_attach,            ata_pci_attach),
       DEVMETHOD(device_detach,            ata_pci_detach),
       DEVMETHOD(device_shutdown,          bus_generic_shutdown),
       DEVMETHOD(device_suspend,           bus_generic_suspend),
       DEVMETHOD(device_resume,            bus_generic_resume),
   
       /* bus methods */
       DEVMETHOD(bus_alloc_resource,       ata_pci_alloc_resource),
       DEVMETHOD(bus_release_resource,     ata_pci_release_resource),
       DEVMETHOD(bus_activate_resource,    bus_generic_activate_resource),
       DEVMETHOD(bus_deactivate_resource,  bus_generic_deactivate_resource),
       DEVMETHOD(bus_setup_intr,           ata_pci_setup_intr),
       DEVMETHOD(bus_teardown_intr,        ata_pci_teardown_intr),
   
       { 0, 0 }
   };
   
   devclass_t atapci_devclass;
   
   static driver_t ata_pci_driver = {
       "atapci",
       ata_pci_methods,
       sizeof(struct ata_pci_controller),
   };
   
   DRIVER_MODULE(atapci, pci, ata_pci_driver, atapci_devclass, 0, 0);
   MODULE_VERSION(atapci, 1);
   MODULE_DEPEND(atapci, ata, 1, 1, 1);
   
   static int
   ata_pcichannel_probe(device_t dev)
   {
       struct ata_channel *ch = device_get_softc(dev);
       device_t *children;
       int count, i;
       char buffer[32];
   
       /* take care of green memory */
       bzero(ch, sizeof(struct ata_channel));
   
       /* find channel number on this controller */
       device_get_children(device_get_parent(dev), &children, &count);
       for (i = 0; i < count; i++) {
           if (children[i] == dev)
               ch->unit = i;
       }
       free(children, M_TEMP);
   
       sprintf(buffer, "ATA channel %d", ch->unit);
       device_set_desc_copy(dev, buffer);
   
       return ata_probe(dev);
   }
   
   static int
   ata_pcichannel_attach(device_t dev)
   {
       struct ata_pci_controller *ctlr = device_get_softc(device_get_parent(dev));
       struct ata_channel *ch = device_get_softc(dev);
       int error;
   
       if (ctlr->dmainit)
           ctlr->dmainit(dev);
       if (ch->dma)
           ch->dma->alloc(dev);
   
       if ((error = ctlr->allocate(dev))) {
           if (ch->dma)
               ch->dma->free(dev);
           return error;
       }
   
       return ata_attach(dev);
   }
   
   static int
   ata_pcichannel_detach(device_t dev)
   {
       struct ata_channel *ch = device_get_softc(dev);
       int error;
   
       if ((error = ata_detach(dev)))
           return error;
   
       if (ch->dma)
           ch->dma->free(dev);
   
       /* XXX SOS free resources for io and ctlio ?? */
   
       return 0;
   }
   
   static int
   ata_pcichannel_locking(device_t dev, int mode)
   {
       struct ata_pci_controller *ctlr = device_get_softc(device_get_parent(dev));
       struct ata_channel *ch = device_get_softc(dev);
   
       if (ctlr->locking)
           return ctlr->locking(dev, mode);
       else
           return ch->unit;
   }
   
   static void
   ata_pcichannel_reset(device_t dev)
   {
       struct ata_pci_controller *ctlr = device_get_softc(device_get_parent(dev));
       struct ata_channel *ch = device_get_softc(dev);
   
       /* if DMA engine present reset it  */
       if (ch->dma) {
           if (ch->dma->reset)
               ch->dma->reset(dev);
           ch->dma->unload(dev);
       }
   
       /* reset the controller HW */
       if (ctlr->reset)
           ctlr->reset(dev);
       else
           ata_generic_reset(dev);
   }
   
   static void
   ata_pcichannel_setmode(device_t parent, device_t dev)
   {
       struct ata_pci_controller *ctlr = device_get_softc(GRANDPARENT(dev));
       struct ata_device *atadev = device_get_softc(dev);
       int mode = atadev->mode;
   
       ctlr->setmode(dev, ATA_PIO_MAX);
       if (mode >= ATA_DMA)
           ctlr->setmode(dev, mode);
   }
   
   static device_method_t ata_pcichannel_methods[] = {
       /* device interface */
       DEVMETHOD(device_probe,     ata_pcichannel_probe),
       DEVMETHOD(device_attach,    ata_pcichannel_attach),
       DEVMETHOD(device_detach,    ata_pcichannel_detach),
       DEVMETHOD(device_shutdown,  bus_generic_shutdown),
       DEVMETHOD(device_suspend,   ata_suspend),
       DEVMETHOD(device_resume,    ata_resume),
   
       /* ATA methods */
       DEVMETHOD(ata_setmode,      ata_pcichannel_setmode),
       DEVMETHOD(ata_locking,      ata_pcichannel_locking),
       DEVMETHOD(ata_reset,        ata_pcichannel_reset),
   
       { 0, 0 }
   };
   
   driver_t ata_pcichannel_driver = {
       "ata",
       ata_pcichannel_methods,
       sizeof(struct ata_channel),
   };
   
   DRIVER_MODULE(ata, atapci, ata_pcichannel_driver, ata_devclass, 0, 0);

Cache object: 5fe58c8293f9ed3a4b158fcb9d8d16f2