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freebsd-dev/sys/dev/amr/amr_pci.c
Scott Long 281017a577 Rewrite the DMA code paths from being an impenitrable maze of special cases 
to a much saner and simplier unified code path.  Along the way, fix various
CAM nits and bugs so that the passthrough works correctly for all cases.
2007-12-12 05:55:03 +00:00

720 lines
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/*-
* Copyright (c) 1999,2000 Michael Smith
* Copyright (c) 2000 BSDi
* 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.
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*/
/*-
* Copyright (c) 2002 Eric Moore
* Copyright (c) 2002, 2004 LSI Logic Corporation
* 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.
* 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.
* 3. The party using or redistributing the source code and binary forms
* agrees to the disclaimer below and the terms and conditions set forth
* herein.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/sysctl.h>
#include <sys/bio.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/amr/amrio.h>
#include <dev/amr/amrreg.h>
#include <dev/amr/amrvar.h>
static int amr_pci_probe(device_t dev);
static int amr_pci_attach(device_t dev);
static int amr_pci_detach(device_t dev);
static int amr_pci_shutdown(device_t dev);
static int amr_pci_suspend(device_t dev);
static int amr_pci_resume(device_t dev);
static void amr_pci_intr(void *arg);
static void amr_pci_free(struct amr_softc *sc);
static void amr_sglist_helper(void *arg, bus_dma_segment_t *segs, int nseg, int error);
static int amr_sglist_map(struct amr_softc *sc);
static int amr_setup_mbox(struct amr_softc *sc);
static int amr_ccb_map(struct amr_softc *sc);
static u_int amr_force_sg32 = 0;
TUNABLE_INT("hw.amr.force_sg32", &amr_force_sg32);
SYSCTL_DECL(_hw_amr);
SYSCTL_UINT(_hw_amr, OID_AUTO, force_sg32, CTLFLAG_RDTUN, &amr_force_sg32, 0,
"Force the AMR driver to use 32bit scatter gather");
static device_method_t amr_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, amr_pci_probe),
DEVMETHOD(device_attach, amr_pci_attach),
DEVMETHOD(device_detach, amr_pci_detach),
DEVMETHOD(device_shutdown, amr_pci_shutdown),
DEVMETHOD(device_suspend, amr_pci_suspend),
DEVMETHOD(device_resume, amr_pci_resume),
DEVMETHOD(bus_print_child, bus_generic_print_child),
DEVMETHOD(bus_driver_added, bus_generic_driver_added),
{ 0, 0 }
};
static driver_t amr_pci_driver = {
"amr",
amr_methods,
sizeof(struct amr_softc)
};
static devclass_t amr_devclass;
DRIVER_MODULE(amr, pci, amr_pci_driver, amr_devclass, 0, 0);
MODULE_DEPEND(amr, pci, 1, 1, 1);
MODULE_DEPEND(amr, cam, 1, 1, 1);
static struct amr_ident
{
int vendor;
int device;
int flags;
#define AMR_ID_PROBE_SIG (1<<0) /* generic i960RD, check signature */
#define AMR_ID_DO_SG64 (1<<1)
#define AMR_ID_QUARTZ (1<<2)
} amr_device_ids[] = {
{0x101e, 0x9010, 0},
{0x101e, 0x9060, 0},
{0x8086, 0x1960, AMR_ID_QUARTZ | AMR_ID_PROBE_SIG},
{0x101e, 0x1960, AMR_ID_QUARTZ},
{0x1000, 0x1960, AMR_ID_QUARTZ | AMR_ID_DO_SG64 | AMR_ID_PROBE_SIG},
{0x1000, 0x0407, AMR_ID_QUARTZ | AMR_ID_DO_SG64},
{0x1000, 0x0408, AMR_ID_QUARTZ | AMR_ID_DO_SG64},
{0x1000, 0x0409, AMR_ID_QUARTZ | AMR_ID_DO_SG64},
{0x1028, 0x000e, AMR_ID_QUARTZ | AMR_ID_DO_SG64 | AMR_ID_PROBE_SIG}, /* perc4/di i960 */
{0x1028, 0x000f, AMR_ID_QUARTZ | AMR_ID_DO_SG64}, /* perc4/di Verde*/
{0x1028, 0x0013, AMR_ID_QUARTZ | AMR_ID_DO_SG64}, /* perc4/di */
{0, 0, 0}
};
static struct amr_ident *
amr_find_ident(device_t dev)
{
struct amr_ident *id;
int sig;
for (id = amr_device_ids; id->vendor != 0; id++) {
if ((pci_get_vendor(dev) == id->vendor) &&
(pci_get_device(dev) == id->device)) {
/* do we need to test for a signature? */
if (id->flags & AMR_ID_PROBE_SIG) {
sig = pci_read_config(dev, AMR_CFG_SIG, 2);
if ((sig != AMR_SIGNATURE_1) && (sig != AMR_SIGNATURE_2))
continue;
}
return (id);
}
}
return (NULL);
}
static int
amr_pci_probe(device_t dev)
{
debug_called(1);
if (amr_find_ident(dev) != NULL) {
device_set_desc(dev, LSI_DESC_PCI);
return(BUS_PROBE_DEFAULT);
}
return(ENXIO);
}
static int
amr_pci_attach(device_t dev)
{
struct amr_softc *sc;
struct amr_ident *id;
int rid, rtype, error;
u_int32_t command;
debug_called(1);
/*
* Initialise softc.
*/
sc = device_get_softc(dev);
bzero(sc, sizeof(*sc));
sc->amr_dev = dev;
/* assume failure is 'not configured' */
error = ENXIO;
/*
* Determine board type.
*/
if ((id = amr_find_ident(dev)) == NULL)
return (ENXIO);
command = pci_read_config(dev, PCIR_COMMAND, 1);
if (id->flags & AMR_ID_QUARTZ) {
/*
* Make sure we are going to be able to talk to this board.
*/
if ((command & PCIM_CMD_MEMEN) == 0) {
device_printf(dev, "memory window not available\n");
return (ENXIO);
}
sc->amr_type |= AMR_TYPE_QUARTZ;
} else {
/*
* Make sure we are going to be able to talk to this board.
*/
if ((command & PCIM_CMD_PORTEN) == 0) {
device_printf(dev, "I/O window not available\n");
return (ENXIO);
}
}
if ((amr_force_sg32 == 0) && (id->flags & AMR_ID_DO_SG64) &&
(sizeof(vm_paddr_t) > 4)) {
device_printf(dev, "Using 64-bit DMA\n");
sc->amr_type |= AMR_TYPE_SG64;
}
/* force the busmaster enable bit on */
if (!(command & PCIM_CMD_BUSMASTEREN)) {
device_printf(dev, "busmaster bit not set, enabling\n");
command |= PCIM_CMD_BUSMASTEREN;
pci_write_config(dev, PCIR_COMMAND, command, 2);
}
/*
* Allocate the PCI register window.
*/
rid = PCIR_BAR(0);
rtype = AMR_IS_QUARTZ(sc) ? SYS_RES_MEMORY : SYS_RES_IOPORT;
sc->amr_reg = bus_alloc_resource_any(dev, rtype, &rid, RF_ACTIVE);
if (sc->amr_reg == NULL) {
device_printf(sc->amr_dev, "can't allocate register window\n");
goto out;
}
sc->amr_btag = rman_get_bustag(sc->amr_reg);
sc->amr_bhandle = rman_get_bushandle(sc->amr_reg);
/*
* Allocate and connect our interrupt.
*/
rid = 0;
sc->amr_irq = bus_alloc_resource_any(sc->amr_dev, SYS_RES_IRQ, &rid,
RF_SHAREABLE | RF_ACTIVE);
if (sc->amr_irq == NULL) {
device_printf(sc->amr_dev, "can't allocate interrupt\n");
goto out;
}
if (bus_setup_intr(sc->amr_dev, sc->amr_irq,
INTR_TYPE_BIO | INTR_ENTROPY | INTR_MPSAFE, NULL, amr_pci_intr,
sc, &sc->amr_intr)) {
device_printf(sc->amr_dev, "can't set up interrupt\n");
goto out;
}
debug(2, "interrupt attached");
/* assume failure is 'out of memory' */
error = ENOMEM;
/*
* Allocate the parent bus DMA tag appropriate for PCI.
*/
if (bus_dma_tag_create(NULL, /* parent */
1, 0, /* alignment,boundary */
AMR_IS_SG64(sc) ?
BUS_SPACE_MAXADDR :
BUS_SPACE_MAXADDR_32BIT, /* lowaddr */
BUS_SPACE_MAXADDR, /* highaddr */
NULL, NULL, /* filter, filterarg */
MAXBSIZE, AMR_NSEG, /* maxsize, nsegments */
BUS_SPACE_MAXSIZE_32BIT, /* maxsegsize */
0, /* flags */
NULL, NULL, /* lockfunc, lockarg */
&sc->amr_parent_dmat)) {
device_printf(dev, "can't allocate parent DMA tag\n");
goto out;
}
/*
* Create DMA tag for mapping buffers into controller-addressable space.
*/
if (bus_dma_tag_create(sc->amr_parent_dmat, /* parent */
1, 0, /* alignment,boundary */
BUS_SPACE_MAXADDR_32BIT, /* lowaddr */
BUS_SPACE_MAXADDR, /* highaddr */
NULL, NULL, /* filter, filterarg */
MAXBSIZE, AMR_NSEG, /* maxsize, nsegments */
MAXBSIZE, /* maxsegsize */
0, /* flags */
busdma_lock_mutex, /* lockfunc */
&sc->amr_list_lock, /* lockarg */
&sc->amr_buffer_dmat)) {
device_printf(sc->amr_dev, "can't allocate buffer DMA tag\n");
goto out;
}
if (bus_dma_tag_create(sc->amr_parent_dmat, /* parent */
1, 0, /* alignment,boundary */
BUS_SPACE_MAXADDR, /* lowaddr */
BUS_SPACE_MAXADDR, /* highaddr */
NULL, NULL, /* filter, filterarg */
MAXBSIZE, AMR_NSEG, /* maxsize, nsegments */
MAXBSIZE, /* maxsegsize */
0, /* flags */
busdma_lock_mutex, /* lockfunc */
&sc->amr_list_lock, /* lockarg */
&sc->amr_buffer64_dmat)) {
device_printf(sc->amr_dev, "can't allocate buffer DMA tag\n");
goto out;
}
debug(2, "dma tag done");
/*
* Allocate and set up mailbox in a bus-visible fashion.
*/
mtx_init(&sc->amr_list_lock, "AMR List Lock", NULL, MTX_DEF);
mtx_init(&sc->amr_hw_lock, "AMR HW Lock", NULL, MTX_DEF);
if ((error = amr_setup_mbox(sc)) != 0)
goto out;
debug(2, "mailbox setup");
/*
* Build the scatter/gather buffers.
*/
if (amr_sglist_map(sc))
goto out;
debug(2, "s/g list mapped");
if (amr_ccb_map(sc))
goto out;
debug(2, "ccb mapped");
/*
* Do bus-independant initialisation, bring controller online.
*/
error = amr_attach(sc);
out:
if (error)
amr_pci_free(sc);
return(error);
}
/********************************************************************************
* Disconnect from the controller completely, in preparation for unload.
*/
static int
amr_pci_detach(device_t dev)
{
struct amr_softc *sc = device_get_softc(dev);
int error;
debug_called(1);
if (sc->amr_state & AMR_STATE_OPEN)
return(EBUSY);
if ((error = amr_pci_shutdown(dev)))
return(error);
amr_pci_free(sc);
return(0);
}
/********************************************************************************
* Bring the controller down to a dormant state and detach all child devices.
*
* This function is called before detach, system shutdown, or before performing
* an operation which may add or delete system disks. (Call amr_startup to
* resume normal operation.)
*
* Note that we can assume that the bioq on the controller is empty, as we won't
* allow shutdown if any device is open.
*/
static int
amr_pci_shutdown(device_t dev)
{
struct amr_softc *sc = device_get_softc(dev);
int i,error;
debug_called(1);
/* mark ourselves as in-shutdown */
sc->amr_state |= AMR_STATE_SHUTDOWN;
/* flush controller */
device_printf(sc->amr_dev, "flushing cache...");
printf("%s\n", amr_flush(sc) ? "failed" : "done");
error = 0;
/* delete all our child devices */
for(i = 0 ; i < AMR_MAXLD; i++) {
if( sc->amr_drive[i].al_disk != 0) {
if((error = device_delete_child(sc->amr_dev,sc->amr_drive[i].al_disk)) != 0)
goto shutdown_out;
sc->amr_drive[i].al_disk = 0;
}
}
/* XXX disable interrupts? */
shutdown_out:
return(error);
}
/********************************************************************************
* Bring the controller to a quiescent state, ready for system suspend.
*/
static int
amr_pci_suspend(device_t dev)
{
struct amr_softc *sc = device_get_softc(dev);
debug_called(1);
sc->amr_state |= AMR_STATE_SUSPEND;
/* flush controller */
device_printf(sc->amr_dev, "flushing cache...");
printf("%s\n", amr_flush(sc) ? "failed" : "done");
/* XXX disable interrupts? */
return(0);
}
/********************************************************************************
* Bring the controller back to a state ready for operation.
*/
static int
amr_pci_resume(device_t dev)
{
struct amr_softc *sc = device_get_softc(dev);
debug_called(1);
sc->amr_state &= ~AMR_STATE_SUSPEND;
/* XXX enable interrupts? */
return(0);
}
/*******************************************************************************
* Take an interrupt, or be poked by other code to look for interrupt-worthy
* status.
*/
static void
amr_pci_intr(void *arg)
{
struct amr_softc *sc = (struct amr_softc *)arg;
debug_called(3);
/* collect finished commands, queue anything waiting */
amr_done(sc);
}
/********************************************************************************
* Free all of the resources associated with (sc)
*
* Should not be called if the controller is active.
*/
static void
amr_pci_free(struct amr_softc *sc)
{
void *p;
debug_called(1);
amr_free(sc);
/* destroy data-transfer DMA tag */
if (sc->amr_buffer_dmat)
bus_dma_tag_destroy(sc->amr_buffer_dmat);
if (sc->amr_buffer64_dmat)
bus_dma_tag_destroy(sc->amr_buffer64_dmat);
/* free and destroy DMA memory and tag for passthrough pool */
if (sc->amr_ccb)
bus_dmamem_free(sc->amr_ccb_dmat, sc->amr_ccb, sc->amr_ccb_dmamap);
if (sc->amr_ccb_dmat)
bus_dma_tag_destroy(sc->amr_ccb_dmat);
/* free and destroy DMA memory and tag for s/g lists */
if (sc->amr_sgtable)
bus_dmamem_free(sc->amr_sg_dmat, sc->amr_sgtable, sc->amr_sg_dmamap);
if (sc->amr_sg_dmat)
bus_dma_tag_destroy(sc->amr_sg_dmat);
/* free and destroy DMA memory and tag for mailbox */
p = (void *)(uintptr_t)(volatile void *)sc->amr_mailbox64;
if (sc->amr_mailbox) {
bus_dmamem_free(sc->amr_mailbox_dmat, p, sc->amr_mailbox_dmamap);
}
if (sc->amr_mailbox_dmat)
bus_dma_tag_destroy(sc->amr_mailbox_dmat);
/* disconnect the interrupt handler */
if (sc->amr_intr)
bus_teardown_intr(sc->amr_dev, sc->amr_irq, sc->amr_intr);
if (sc->amr_irq != NULL)
bus_release_resource(sc->amr_dev, SYS_RES_IRQ, 0, sc->amr_irq);
/* destroy the parent DMA tag */
if (sc->amr_parent_dmat)
bus_dma_tag_destroy(sc->amr_parent_dmat);
/* release the register window mapping */
if (sc->amr_reg != NULL)
bus_release_resource(sc->amr_dev,
AMR_IS_QUARTZ(sc) ? SYS_RES_MEMORY : SYS_RES_IOPORT,
PCIR_BAR(0), sc->amr_reg);
}
/********************************************************************************
* Allocate and map the scatter/gather table in bus space.
*/
static void
amr_sglist_helper(void *arg, bus_dma_segment_t *segs, int nseg, int error)
{
uint32_t *addr;
debug_called(1);
addr = arg;
*addr = segs[0].ds_addr;
}
static int
amr_sglist_map(struct amr_softc *sc)
{
size_t segsize;
void *p;
int error;
debug_called(1);
/*
* Create a single tag describing a region large enough to hold all of
* the s/g lists we will need.
*
* Note that we could probably use AMR_LIMITCMD here, but that may become
* tunable.
*/
if (AMR_IS_SG64(sc))
segsize = sizeof(struct amr_sg64entry) * AMR_NSEG * AMR_MAXCMD;
else
segsize = sizeof(struct amr_sgentry) * AMR_NSEG * AMR_MAXCMD;
error = bus_dma_tag_create(sc->amr_parent_dmat, /* parent */
512, 0, /* alignment,boundary */
BUS_SPACE_MAXADDR_32BIT, /* lowaddr */
BUS_SPACE_MAXADDR, /* highaddr */
NULL, NULL, /* filter, filterarg */
segsize, 1, /* maxsize, nsegments */
BUS_SPACE_MAXSIZE_32BIT, /* maxsegsize */
0, /* flags */
NULL, NULL, /* lockfunc, lockarg */
&sc->amr_sg_dmat);
if (error != 0) {
device_printf(sc->amr_dev, "can't allocate scatter/gather DMA tag\n");
return(ENOMEM);
}
/*
* Allocate enough s/g maps for all commands and permanently map them into
* controller-visible space.
*
* XXX this assumes we can get enough space for all the s/g maps in one
* contiguous slab. We may need to switch to a more complex arrangement
* where we allocate in smaller chunks and keep a lookup table from slot
* to bus address.
*
* XXX HACK ALERT: at least some controllers don't like the s/g memory
* being allocated below 0x2000. We leak some memory if
* we get some below this mark and allocate again. We
* should be able to avoid this with the tag setup, but
* that does't seem to work.
*/
retry:
error = bus_dmamem_alloc(sc->amr_sg_dmat, (void **)&p, BUS_DMA_NOWAIT, &sc->amr_sg_dmamap);
if (error) {
device_printf(sc->amr_dev, "can't allocate s/g table\n");
return(ENOMEM);
}
bus_dmamap_load(sc->amr_sg_dmat, sc->amr_sg_dmamap, p, segsize, amr_sglist_helper, &sc->amr_sgbusaddr, 0);
if (sc->amr_sgbusaddr < 0x2000) {
debug(1, "s/g table too low (0x%x), reallocating\n", sc->amr_sgbusaddr);
goto retry;
}
if (AMR_IS_SG64(sc))
sc->amr_sg64table = (struct amr_sg64entry *)p;
sc->amr_sgtable = (struct amr_sgentry *)p;
return(0);
}
/********************************************************************************
* Allocate and set up mailbox areas for the controller (sc)
*
* The basic mailbox structure should be 16-byte aligned.
*/
static int
amr_setup_mbox(struct amr_softc *sc)
{
int error;
void *p;
uint32_t baddr;
debug_called(1);
/*
* Create a single tag describing a region large enough to hold the entire
* mailbox.
*/
error = bus_dma_tag_create(sc->amr_parent_dmat, /* parent */
16, 0, /* alignment,boundary */
BUS_SPACE_MAXADDR_32BIT, /* lowaddr */
BUS_SPACE_MAXADDR, /* highaddr */
NULL, NULL, /* filter, filterarg */
sizeof(struct amr_mailbox64), /* maxsize */
1, /* nsegments */
BUS_SPACE_MAXSIZE_32BIT, /* maxsegsize */
0, /* flags */
NULL, NULL, /* lockfunc, lockarg */
&sc->amr_mailbox_dmat);
if (error != 0) {
device_printf(sc->amr_dev, "can't allocate mailbox tag\n");
return(ENOMEM);
}
/*
* Allocate the mailbox structure and permanently map it into
* controller-visible space.
*/
error = bus_dmamem_alloc(sc->amr_mailbox_dmat, (void **)&p, BUS_DMA_NOWAIT,
&sc->amr_mailbox_dmamap);
if (error) {
device_printf(sc->amr_dev, "can't allocate mailbox memory\n");
return(ENOMEM);
}
bus_dmamap_load(sc->amr_mailbox_dmat, sc->amr_mailbox_dmamap, p,
sizeof(struct amr_mailbox64), amr_sglist_helper, &baddr, 0);
/*
* Conventional mailbox is inside the mailbox64 region.
*/
/* save physical base of the basic mailbox structure */
sc->amr_mailboxphys = baddr + offsetof(struct amr_mailbox64, mb);
bzero(p, sizeof(struct amr_mailbox64));
sc->amr_mailbox64 = (struct amr_mailbox64 *)p;
sc->amr_mailbox = &sc->amr_mailbox64->mb;
return(0);
}
static int
amr_ccb_map(struct amr_softc *sc)
{
int ccbsize, error;
/*
* Passthrough and Extended passthrough structures will share the same
* memory.
*/
ccbsize = sizeof(union amr_ccb) * AMR_MAXCMD;
error = bus_dma_tag_create(sc->amr_parent_dmat, /* parent */
128, 0, /* alignment,boundary */
BUS_SPACE_MAXADDR_32BIT,/* lowaddr */
BUS_SPACE_MAXADDR, /* highaddr */
NULL, NULL, /* filter, filterarg */
ccbsize, /* maxsize */
1, /* nsegments */
ccbsize, /* maxsegsize */
0, /* flags */
NULL, NULL, /* lockfunc, lockarg */
&sc->amr_ccb_dmat);
if (error != 0) {
device_printf(sc->amr_dev, "can't allocate ccb tag\n");
return (ENOMEM);
}
error = bus_dmamem_alloc(sc->amr_ccb_dmat, (void **)&sc->amr_ccb,
BUS_DMA_NOWAIT, &sc->amr_ccb_dmamap);
if (error) {
device_printf(sc->amr_dev, "can't allocate ccb memory\n");
return (ENOMEM);
}
bus_dmamap_load(sc->amr_ccb_dmat, sc->amr_ccb_dmamap, sc->amr_ccb,
ccbsize, amr_sglist_helper, &sc->amr_ccb_busaddr, 0);
bzero(sc->amr_ccb, ccbsize);
return (0);
}
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