freebsd-dev/sys/dev/ath/if_ath_pci.c
Adrian Chadd 0f0c074eaa Conditionally compile the PCI latency workaround; I think it's
only required for some earlier NICs.
2011-11-08 18:37:52 +00:00

298 lines
7.4 KiB
C

/*-
* Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
* 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.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
* redistribution must be conditioned upon including a substantially
* similar Disclaimer requirement for further binary redistribution.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* PCI/Cardbus front-end for the Atheros Wireless LAN controller driver.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/errno.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_media.h>
#include <net/if_arp.h>
#include <net80211/ieee80211_var.h>
#include <dev/ath/if_athvar.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
/*
* PCI glue.
*/
struct ath_pci_softc {
struct ath_softc sc_sc;
struct resource *sc_sr; /* memory resource */
struct resource *sc_irq; /* irq resource */
void *sc_ih; /* interrupt handler */
};
#define BS_BAR 0x10
#define PCIR_RETRY_TIMEOUT 0x41
#define PCIR_CFG_PMCSR 0x48
static void
ath_pci_setup(device_t dev)
{
#ifdef ATH_PCI_LATENCY_WAR
/* Override the system latency timer */
pci_write_config(dev, PCIR_LATTIMER, 0x80, 1);
#endif
/* If a PCI NIC, force wakeup */
#ifdef ATH_PCI_WAKEUP_WAR
/* XXX TODO: don't do this for non-PCI (ie, PCIe, Cardbus!) */
if (1) {
uint16_t pmcsr;
pmcsr = pci_read_config(dev, PCIR_CFG_PMCSR, 2);
pmcsr |= 3;
pci_write_config(dev, PCIR_CFG_PMCSR, pmcsr, 2);
pmcsr &= ~3;
pci_write_config(dev, PCIR_CFG_PMCSR, pmcsr, 2);
}
#endif
/*
* Disable retry timeout to keep PCI Tx retries from
* interfering with C3 CPU state.
*/
pci_write_config(dev, PCIR_RETRY_TIMEOUT, 0, 1);
}
static int
ath_pci_probe(device_t dev)
{
const char* devname;
devname = ath_hal_probe(pci_get_vendor(dev), pci_get_device(dev));
if (devname != NULL) {
device_set_desc(dev, devname);
return BUS_PROBE_DEFAULT;
}
return ENXIO;
}
static int
ath_pci_attach(device_t dev)
{
struct ath_pci_softc *psc = device_get_softc(dev);
struct ath_softc *sc = &psc->sc_sc;
int error = ENXIO;
int rid;
sc->sc_dev = dev;
/*
* Enable bus mastering.
*/
pci_enable_busmaster(dev);
/*
* Setup other PCI bus configuration parameters.
*/
ath_pci_setup(dev);
/*
* Setup memory-mapping of PCI registers.
*/
rid = BS_BAR;
psc->sc_sr = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
if (psc->sc_sr == NULL) {
device_printf(dev, "cannot map register space\n");
goto bad;
}
/* XXX uintptr_t is a bandaid for ia64; to be fixed */
sc->sc_st = (HAL_BUS_TAG)(uintptr_t) rman_get_bustag(psc->sc_sr);
sc->sc_sh = (HAL_BUS_HANDLE) rman_get_bushandle(psc->sc_sr);
/*
* Mark device invalid so any interrupts (shared or otherwise)
* that arrive before the HAL is setup are discarded.
*/
sc->sc_invalid = 1;
/*
* Arrange interrupt line.
*/
rid = 0;
psc->sc_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
RF_SHAREABLE|RF_ACTIVE);
if (psc->sc_irq == NULL) {
device_printf(dev, "could not map interrupt\n");
goto bad1;
}
if (bus_setup_intr(dev, psc->sc_irq,
INTR_TYPE_NET | INTR_MPSAFE,
NULL, ath_intr, sc, &psc->sc_ih)) {
device_printf(dev, "could not establish interrupt\n");
goto bad2;
}
/*
* Setup DMA descriptor area.
*/
if (bus_dma_tag_create(bus_get_dma_tag(dev), /* parent */
1, 0, /* alignment, bounds */
BUS_SPACE_MAXADDR_32BIT, /* lowaddr */
BUS_SPACE_MAXADDR, /* highaddr */
NULL, NULL, /* filter, filterarg */
0x3ffff, /* maxsize XXX */
ATH_MAX_SCATTER, /* nsegments */
0x3ffff, /* maxsegsize XXX */
BUS_DMA_ALLOCNOW, /* flags */
NULL, /* lockfunc */
NULL, /* lockarg */
&sc->sc_dmat)) {
device_printf(dev, "cannot allocate DMA tag\n");
goto bad3;
}
ATH_LOCK_INIT(sc);
ATH_PCU_LOCK_INIT(sc);
error = ath_attach(pci_get_device(dev), sc);
if (error == 0) /* success */
return 0;
ATH_PCU_LOCK_DESTROY(sc);
ATH_LOCK_DESTROY(sc);
bus_dma_tag_destroy(sc->sc_dmat);
bad3:
bus_teardown_intr(dev, psc->sc_irq, psc->sc_ih);
bad2:
bus_release_resource(dev, SYS_RES_IRQ, 0, psc->sc_irq);
bad1:
bus_release_resource(dev, SYS_RES_MEMORY, BS_BAR, psc->sc_sr);
bad:
return (error);
}
static int
ath_pci_detach(device_t dev)
{
struct ath_pci_softc *psc = device_get_softc(dev);
struct ath_softc *sc = &psc->sc_sc;
/* check if device was removed */
sc->sc_invalid = !bus_child_present(dev);
/*
* Do a config read to clear pre-existing pci error status.
*/
(void) pci_read_config(dev, PCIR_COMMAND, 4);
ath_detach(sc);
bus_generic_detach(dev);
bus_teardown_intr(dev, psc->sc_irq, psc->sc_ih);
bus_release_resource(dev, SYS_RES_IRQ, 0, psc->sc_irq);
bus_dma_tag_destroy(sc->sc_dmat);
bus_release_resource(dev, SYS_RES_MEMORY, BS_BAR, psc->sc_sr);
ATH_PCU_LOCK_DESTROY(sc);
ATH_LOCK_DESTROY(sc);
return (0);
}
static int
ath_pci_shutdown(device_t dev)
{
struct ath_pci_softc *psc = device_get_softc(dev);
ath_shutdown(&psc->sc_sc);
return (0);
}
static int
ath_pci_suspend(device_t dev)
{
struct ath_pci_softc *psc = device_get_softc(dev);
ath_suspend(&psc->sc_sc);
return (0);
}
static int
ath_pci_resume(device_t dev)
{
struct ath_pci_softc *psc = device_get_softc(dev);
/*
* Suspend/resume resets the PCI configuration space.
*/
ath_pci_setup(dev);
ath_resume(&psc->sc_sc);
return (0);
}
static device_method_t ath_pci_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, ath_pci_probe),
DEVMETHOD(device_attach, ath_pci_attach),
DEVMETHOD(device_detach, ath_pci_detach),
DEVMETHOD(device_shutdown, ath_pci_shutdown),
DEVMETHOD(device_suspend, ath_pci_suspend),
DEVMETHOD(device_resume, ath_pci_resume),
{ 0,0 }
};
static driver_t ath_pci_driver = {
"ath",
ath_pci_methods,
sizeof (struct ath_pci_softc)
};
static devclass_t ath_devclass;
DRIVER_MODULE(ath_pci, pci, ath_pci_driver, ath_devclass, 0, 0);
MODULE_VERSION(ath_pci, 1);
MODULE_DEPEND(ath_pci, wlan, 1, 1, 1); /* 802.11 media layer */
MODULE_DEPEND(ath_pci, if_ath, 1, 1, 1); /* if_ath driver */