if_ath_pci.c

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    1 /*-
    2  * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer,
   10  *    without modification.
   11  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
   12  *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
   13  *    redistribution must be conditioned upon including a substantially
   14  *    similar Disclaimer requirement for further binary redistribution.
   15  *
   16  * NO WARRANTY
   17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   19  * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
   20  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
   21  * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
   22  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
   25  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   27  * THE POSSIBILITY OF SUCH DAMAGES.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD: releng/8.4/sys/dev/ath/if_ath_pci.c 192147 2009-05-15 17:02:11Z imp $");
   32 
   33 /*
   34  * PCI/Cardbus front-end for the Atheros Wireless LAN controller driver.
   35  */
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h> 
   39 #include <sys/module.h>
   40 #include <sys/kernel.h>
   41 #include <sys/lock.h>
   42 #include <sys/mutex.h>
   43 #include <sys/errno.h>
   44 
   45 #include <machine/bus.h>
   46 #include <machine/resource.h>
   47 #include <sys/bus.h>
   48 #include <sys/rman.h>
   49 
   50 #include <sys/socket.h>
   51  
   52 #include <net/if.h>
   53 #include <net/if_media.h>
   54 #include <net/if_arp.h>
   55 
   56 #include <net80211/ieee80211_var.h>
   57 
   58 #include <dev/ath/if_athvar.h>
   59 
   60 #include <dev/pci/pcivar.h>
   61 #include <dev/pci/pcireg.h>
   62 
   63 /*
   64  * PCI glue.
   65  */
   66 
   67 struct ath_pci_softc {
   68         struct ath_softc        sc_sc;
   69         struct resource         *sc_sr;         /* memory resource */
   70         struct resource         *sc_irq;        /* irq resource */
   71         void                    *sc_ih;         /* interrupt handler */
   72 };
   73 
   74 #define BS_BAR  0x10
   75 #define PCIR_RETRY_TIMEOUT      0x41
   76 
   77 static int
   78 ath_pci_probe(device_t dev)
   79 {
   80         const char* devname;
   81 
   82         devname = ath_hal_probe(pci_get_vendor(dev), pci_get_device(dev));
   83         if (devname != NULL) {
   84                 device_set_desc(dev, devname);
   85                 return BUS_PROBE_DEFAULT;
   86         }
   87         return ENXIO;
   88 }
   89 
   90 static int
   91 ath_pci_attach(device_t dev)
   92 {
   93         struct ath_pci_softc *psc = device_get_softc(dev);
   94         struct ath_softc *sc = &psc->sc_sc;
   95         int error = ENXIO;
   96         int rid;
   97 
   98         sc->sc_dev = dev;
   99 
  100         /*
  101          * Enable bus mastering.
  102          */
  103         pci_enable_busmaster(dev);
  104 
  105         /*
  106          * Disable retry timeout to keep PCI Tx retries from
  107          * interfering with C3 CPU state.
  108          */
  109         pci_write_config(dev, PCIR_RETRY_TIMEOUT, 0, 1);
  110 
  111         /* 
  112          * Setup memory-mapping of PCI registers.
  113          */
  114         rid = BS_BAR;
  115         psc->sc_sr = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
  116                                             RF_ACTIVE);
  117         if (psc->sc_sr == NULL) {
  118                 device_printf(dev, "cannot map register space\n");
  119                 goto bad;
  120         }
  121         /* XXX uintptr_t is a bandaid for ia64; to be fixed */
  122         sc->sc_st = (HAL_BUS_TAG)(uintptr_t) rman_get_bustag(psc->sc_sr);
  123         sc->sc_sh = (HAL_BUS_HANDLE) rman_get_bushandle(psc->sc_sr);
  124         /*
  125          * Mark device invalid so any interrupts (shared or otherwise)
  126          * that arrive before the HAL is setup are discarded.
  127          */
  128         sc->sc_invalid = 1;
  129 
  130         /*
  131          * Arrange interrupt line.
  132          */
  133         rid = 0;
  134         psc->sc_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
  135                                              RF_SHAREABLE|RF_ACTIVE);
  136         if (psc->sc_irq == NULL) {
  137                 device_printf(dev, "could not map interrupt\n");
  138                 goto bad1;
  139         }
  140         if (bus_setup_intr(dev, psc->sc_irq,
  141                            INTR_TYPE_NET | INTR_MPSAFE,
  142                            NULL, ath_intr, sc, &psc->sc_ih)) {
  143                 device_printf(dev, "could not establish interrupt\n");
  144                 goto bad2;
  145         }
  146 
  147         /*
  148          * Setup DMA descriptor area.
  149          */
  150         if (bus_dma_tag_create(bus_get_dma_tag(dev),    /* parent */
  151                                1, 0,                    /* alignment, bounds */
  152                                BUS_SPACE_MAXADDR_32BIT, /* lowaddr */
  153                                BUS_SPACE_MAXADDR,       /* highaddr */
  154                                NULL, NULL,              /* filter, filterarg */
  155                                0x3ffff,                 /* maxsize XXX */
  156                                ATH_MAX_SCATTER,         /* nsegments */
  157                                0x3ffff,                 /* maxsegsize XXX */
  158                                BUS_DMA_ALLOCNOW,        /* flags */
  159                                NULL,                    /* lockfunc */
  160                                NULL,                    /* lockarg */
  161                                &sc->sc_dmat)) {
  162                 device_printf(dev, "cannot allocate DMA tag\n");
  163                 goto bad3;
  164         }
  165 
  166         ATH_LOCK_INIT(sc);
  167 
  168         error = ath_attach(pci_get_device(dev), sc);
  169         if (error == 0)                                 /* success */
  170                 return 0;
  171 
  172         ATH_LOCK_DESTROY(sc);
  173         bus_dma_tag_destroy(sc->sc_dmat);
  174 bad3:
  175         bus_teardown_intr(dev, psc->sc_irq, psc->sc_ih);
  176 bad2:
  177         bus_release_resource(dev, SYS_RES_IRQ, 0, psc->sc_irq);
  178 bad1:
  179         bus_release_resource(dev, SYS_RES_MEMORY, BS_BAR, psc->sc_sr);
  180 bad:
  181         return (error);
  182 }
  183 
  184 static int
  185 ath_pci_detach(device_t dev)
  186 {
  187         struct ath_pci_softc *psc = device_get_softc(dev);
  188         struct ath_softc *sc = &psc->sc_sc;
  189 
  190         /* check if device was removed */
  191         sc->sc_invalid = !bus_child_present(dev);
  192 
  193         ath_detach(sc);
  194 
  195         bus_generic_detach(dev);
  196         bus_teardown_intr(dev, psc->sc_irq, psc->sc_ih);
  197         bus_release_resource(dev, SYS_RES_IRQ, 0, psc->sc_irq);
  198 
  199         bus_dma_tag_destroy(sc->sc_dmat);
  200         bus_release_resource(dev, SYS_RES_MEMORY, BS_BAR, psc->sc_sr);
  201 
  202         ATH_LOCK_DESTROY(sc);
  203 
  204         return (0);
  205 }
  206 
  207 static int
  208 ath_pci_shutdown(device_t dev)
  209 {
  210         struct ath_pci_softc *psc = device_get_softc(dev);
  211 
  212         ath_shutdown(&psc->sc_sc);
  213         return (0);
  214 }
  215 
  216 static int
  217 ath_pci_suspend(device_t dev)
  218 {
  219         struct ath_pci_softc *psc = device_get_softc(dev);
  220 
  221         ath_suspend(&psc->sc_sc);
  222 
  223         return (0);
  224 }
  225 
  226 static int
  227 ath_pci_resume(device_t dev)
  228 {
  229         struct ath_pci_softc *psc = device_get_softc(dev);
  230 
  231         ath_resume(&psc->sc_sc);
  232 
  233         return (0);
  234 }
  235 
  236 static device_method_t ath_pci_methods[] = {
  237         /* Device interface */
  238         DEVMETHOD(device_probe,         ath_pci_probe),
  239         DEVMETHOD(device_attach,        ath_pci_attach),
  240         DEVMETHOD(device_detach,        ath_pci_detach),
  241         DEVMETHOD(device_shutdown,      ath_pci_shutdown),
  242         DEVMETHOD(device_suspend,       ath_pci_suspend),
  243         DEVMETHOD(device_resume,        ath_pci_resume),
  244 
  245         { 0,0 }
  246 };
  247 static driver_t ath_pci_driver = {
  248         "ath",
  249         ath_pci_methods,
  250         sizeof (struct ath_pci_softc)
  251 };
  252 static  devclass_t ath_devclass;
  253 DRIVER_MODULE(ath, pci, ath_pci_driver, ath_devclass, 0, 0);
  254 MODULE_VERSION(ath, 1);
  255 MODULE_DEPEND(ath, wlan, 1, 1, 1);              /* 802.11 media layer */

Cache object: e17a075cc45173347f4e79f5426ffeff

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FreeBSD/Linux Kernel Cross Reference sys/dev/ath/if_ath_pci.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/ath/if_ath_pci.c