if_ath_ahb.c

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    1 /*-
    2  * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
    3  * Copyright (c) 2010-2011 Adrian Chadd, Xenion Pty Ltd
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer,
   11  *    without modification.
   12  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
   13  *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
   14  *    redistribution must be conditioned upon including a substantially
   15  *    similar Disclaimer requirement for further binary redistribution.
   16  *
   17  * NO WARRANTY
   18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   20  * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
   21  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
   22  * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
   23  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
   26  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   28  * THE POSSIBILITY OF SUCH DAMAGES.
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD: releng/11.2/sys/dev/ath/if_ath_ahb.c 331722 2018-03-29 02:50:57Z eadler $");
   33 
   34 /*
   35  * AHB bus front-end for the Atheros Wireless LAN controller driver.
   36  */
   37 
   38 #include "opt_ath.h"
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h> 
   42 #include <sys/malloc.h>
   43 #include <sys/module.h>
   44 #include <sys/kernel.h>
   45 #include <sys/lock.h>
   46 #include <sys/mutex.h>
   47 #include <sys/errno.h>
   48 
   49 #include <machine/bus.h>
   50 #include <machine/resource.h>
   51 #include <sys/bus.h>
   52 #include <sys/rman.h>
   53 
   54 #include <sys/socket.h>
   55  
   56 #include <net/if.h>
   57 #include <net/if_media.h>
   58 #include <net/if_arp.h>
   59 #include <net/ethernet.h>
   60 
   61 #include <net80211/ieee80211_var.h>
   62 
   63 #include <dev/ath/if_athvar.h>
   64 
   65 #include <mips/atheros/ar71xxreg.h>
   66 #include <mips/atheros/ar91xxreg.h>
   67 #include <mips/atheros/ar71xx_cpudef.h>
   68 
   69 /*
   70  * bus glue.
   71  */
   72 
   73 /* number of 16 bit words */
   74 #define ATH_EEPROM_DATA_SIZE    2048
   75 
   76 struct ath_ahb_softc {
   77         struct ath_softc        sc_sc;
   78         struct resource         *sc_sr;         /* memory resource */
   79         struct resource         *sc_irq;        /* irq resource */
   80         struct resource         *sc_eeprom;     /* eeprom location */
   81         void                    *sc_ih;         /* interrupt handler */
   82 };
   83 
   84 #define VENDOR_ATHEROS  0x168c
   85 #define AR9130_DEVID    0x000b
   86 
   87 static int
   88 ath_ahb_probe(device_t dev)
   89 {
   90         int vendor_id, device_id;
   91         const char* devname;
   92 
   93         /*
   94          * Check if a device/vendor ID is provided in hints.
   95          */
   96         if (resource_int_value(device_get_name(dev), device_get_unit(dev),
   97             "vendor_id", &vendor_id) != 0) {
   98                 vendor_id = VENDOR_ATHEROS;
   99         }
  100 
  101         if (resource_int_value(device_get_name(dev), device_get_unit(dev),
  102             "device_id", &device_id) != 0) {
  103                 device_id = AR9130_DEVID;
  104         }
  105 
  106         device_printf(dev, "Vendor=0x%04x, Device=0x%04x\n",
  107             vendor_id & 0xffff,
  108             device_id & 0xffff);
  109 
  110         /* Attempt to probe */
  111         devname = ath_hal_probe(vendor_id, device_id);
  112 
  113         if (devname != NULL) {
  114                 device_set_desc(dev, devname);
  115                 return BUS_PROBE_DEFAULT;
  116         }
  117         return ENXIO;
  118 }
  119 
  120 static void
  121 ath_ahb_intr(void *arg)
  122 {
  123         /* XXX TODO: check if its ours! */
  124         ar71xx_device_flush_ddr(AR71XX_CPU_DDR_FLUSH_WMAC);
  125         ath_intr(arg);
  126 }
  127 
  128 static int
  129 ath_ahb_attach(device_t dev)
  130 {
  131         struct ath_ahb_softc *psc = device_get_softc(dev);
  132         struct ath_softc *sc = &psc->sc_sc;
  133         int error = ENXIO;
  134         int rid;
  135         long eepromaddr;
  136         int eepromsize;
  137         uint8_t *p;
  138         int device_id, vendor_id;
  139 
  140         sc->sc_dev = dev;
  141 
  142         rid = 0;
  143         psc->sc_sr = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
  144         if (psc->sc_sr == NULL) {
  145                 device_printf(dev, "cannot map register space\n");
  146                 goto bad;
  147         }
  148 
  149         if (resource_long_value(device_get_name(dev), device_get_unit(dev),
  150             "eepromaddr", &eepromaddr) != 0) {
  151                 device_printf(dev, "cannot fetch 'eepromaddr' from hints\n");
  152                 goto bad0;
  153         }
  154 
  155         /*
  156          * The default EEPROM size is 2048 * 16 bit words.
  157          * Later EEPROM/OTP/flash regions may be quite a bit bigger.
  158          */
  159         if (resource_int_value(device_get_name(dev), device_get_unit(dev),
  160             "eepromsize", &eepromsize) != 0) {
  161                 eepromsize = ATH_EEPROM_DATA_SIZE * 2;
  162         }
  163 
  164         rid = 0;
  165         device_printf(sc->sc_dev, "eeprom @ %p (%d bytes)\n",
  166             (void *) eepromaddr, eepromsize);
  167         /*
  168          * XXX this assumes that the parent device is the nexus
  169          * and will just pass through requests for all of memory.
  170          *
  171          * Later on, when this has to attach off of the actual
  172          * AHB, this won't work.
  173          *
  174          * Ideally this would be done in machdep code in mips/atheros/
  175          * and it'd expose the EEPROM via the firmware interface,
  176          * so the ath/ath_ahb drivers can be loaded as modules
  177          * after boot-time.
  178          */
  179         psc->sc_eeprom = bus_alloc_resource(dev, SYS_RES_MEMORY,
  180             &rid, (uintptr_t) eepromaddr,
  181             (uintptr_t) eepromaddr + (uintptr_t) (eepromsize - 1), 0, RF_ACTIVE);
  182         if (psc->sc_eeprom == NULL) {
  183                 device_printf(dev, "cannot map eeprom space\n");
  184                 goto bad0;
  185         }
  186 
  187         sc->sc_st = (HAL_BUS_TAG) rman_get_bustag(psc->sc_sr);
  188         sc->sc_sh = (HAL_BUS_HANDLE) rman_get_bushandle(psc->sc_sr);
  189         /*
  190          * Mark device invalid so any interrupts (shared or otherwise)
  191          * that arrive before the HAL is setup are discarded.
  192          */
  193         sc->sc_invalid = 1;
  194 
  195         /* Copy the EEPROM data out */
  196         sc->sc_eepromdata = malloc(eepromsize, M_TEMP, M_NOWAIT | M_ZERO);
  197         if (sc->sc_eepromdata == NULL) {
  198                 device_printf(dev, "cannot allocate memory for eeprom data\n");
  199                 goto bad1;
  200         }
  201         device_printf(sc->sc_dev, "eeprom data @ %p\n", (void *) rman_get_bushandle(psc->sc_eeprom));
  202         /* XXX why doesn't this work? -adrian */
  203 #if 0
  204         bus_space_read_multi_1(
  205             rman_get_bustag(psc->sc_eeprom),
  206             rman_get_bushandle(psc->sc_eeprom),
  207             0, (u_int8_t *) sc->sc_eepromdata, eepromsize);
  208 #endif
  209         p = (void *) rman_get_bushandle(psc->sc_eeprom);
  210         memcpy(sc->sc_eepromdata, p, eepromsize);
  211 
  212         /*
  213          * Arrange interrupt line.
  214          */
  215         rid = 0;
  216         psc->sc_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_SHAREABLE|RF_ACTIVE);
  217         if (psc->sc_irq == NULL) {
  218                 device_printf(dev, "could not map interrupt\n");
  219                 goto bad1;
  220         }
  221         if (bus_setup_intr(dev, psc->sc_irq,
  222                            INTR_TYPE_NET | INTR_MPSAFE,
  223                            NULL, ath_ahb_intr, sc, &psc->sc_ih)) {
  224                 device_printf(dev, "could not establish interrupt\n");
  225                 goto bad2;
  226         }
  227 
  228         /*
  229          * Setup DMA descriptor area.
  230          */
  231         if (bus_dma_tag_create(bus_get_dma_tag(dev),    /* parent */
  232                                1, 0,                    /* alignment, bounds */
  233                                BUS_SPACE_MAXADDR_32BIT, /* lowaddr */
  234                                BUS_SPACE_MAXADDR,       /* highaddr */
  235                                NULL, NULL,              /* filter, filterarg */
  236                                0x3ffff,                 /* maxsize XXX */
  237                                ATH_MAX_SCATTER,         /* nsegments */
  238                                0x3ffff,                 /* maxsegsize XXX */
  239                                BUS_DMA_ALLOCNOW,        /* flags */
  240                                NULL,                    /* lockfunc */
  241                                NULL,                    /* lockarg */
  242                                &sc->sc_dmat)) {
  243                 device_printf(dev, "cannot allocate DMA tag\n");
  244                 goto bad3;
  245         }
  246 
  247         /*
  248          * Check if a device/vendor ID is provided in hints.
  249          */
  250         if (resource_int_value(device_get_name(dev), device_get_unit(dev),
  251             "vendor_id", &vendor_id) != 0) {
  252                 vendor_id = VENDOR_ATHEROS;
  253         }
  254 
  255         if (resource_int_value(device_get_name(dev), device_get_unit(dev),
  256             "device_id", &device_id) != 0) {
  257                 device_id = AR9130_DEVID;
  258         }
  259 
  260         ATH_LOCK_INIT(sc);
  261         ATH_PCU_LOCK_INIT(sc);
  262         ATH_RX_LOCK_INIT(sc);
  263         ATH_TX_LOCK_INIT(sc);
  264         ATH_TXSTATUS_LOCK_INIT(sc);
  265 
  266         error = ath_attach(device_id, sc);
  267         if (error == 0)                                 /* success */
  268                 return 0;
  269 
  270         ATH_TXSTATUS_LOCK_DESTROY(sc);
  271         ATH_RX_LOCK_DESTROY(sc);
  272         ATH_TX_LOCK_DESTROY(sc);
  273         ATH_PCU_LOCK_DESTROY(sc);
  274         ATH_LOCK_DESTROY(sc);
  275         bus_dma_tag_destroy(sc->sc_dmat);
  276 bad3:
  277         bus_teardown_intr(dev, psc->sc_irq, psc->sc_ih);
  278 bad2:
  279         bus_release_resource(dev, SYS_RES_IRQ, 0, psc->sc_irq);
  280 bad1:
  281         bus_release_resource(dev, SYS_RES_MEMORY, 0, psc->sc_eeprom);
  282 bad0:
  283         bus_release_resource(dev, SYS_RES_MEMORY, 0, psc->sc_sr);
  284 bad:
  285         /* XXX?! */
  286         if (sc->sc_eepromdata)
  287                 free(sc->sc_eepromdata, M_TEMP);
  288         return (error);
  289 }
  290 
  291 static int
  292 ath_ahb_detach(device_t dev)
  293 {
  294         struct ath_ahb_softc *psc = device_get_softc(dev);
  295         struct ath_softc *sc = &psc->sc_sc;
  296 
  297         /* check if device was removed */
  298         sc->sc_invalid = !bus_child_present(dev);
  299 
  300         ath_detach(sc);
  301 
  302         bus_generic_detach(dev);
  303         bus_teardown_intr(dev, psc->sc_irq, psc->sc_ih);
  304         bus_release_resource(dev, SYS_RES_IRQ, 0, psc->sc_irq);
  305 
  306         bus_dma_tag_destroy(sc->sc_dmat);
  307         bus_release_resource(dev, SYS_RES_MEMORY, 0, psc->sc_sr);
  308         bus_release_resource(dev, SYS_RES_MEMORY, 0, psc->sc_eeprom);
  309         /* XXX?! */
  310         if (sc->sc_eepromdata)
  311                 free(sc->sc_eepromdata, M_TEMP);
  312 
  313         ATH_TXSTATUS_LOCK_DESTROY(sc);
  314         ATH_RX_LOCK_DESTROY(sc);
  315         ATH_TX_LOCK_DESTROY(sc);
  316         ATH_PCU_LOCK_DESTROY(sc);
  317         ATH_LOCK_DESTROY(sc);
  318 
  319         return (0);
  320 }
  321 
  322 static int
  323 ath_ahb_shutdown(device_t dev)
  324 {
  325         struct ath_ahb_softc *psc = device_get_softc(dev);
  326 
  327         ath_shutdown(&psc->sc_sc);
  328         return (0);
  329 }
  330 
  331 static int
  332 ath_ahb_suspend(device_t dev)
  333 {
  334         struct ath_ahb_softc *psc = device_get_softc(dev);
  335 
  336         ath_suspend(&psc->sc_sc);
  337 
  338         return (0);
  339 }
  340 
  341 static int
  342 ath_ahb_resume(device_t dev)
  343 {
  344         struct ath_ahb_softc *psc = device_get_softc(dev);
  345 
  346         ath_resume(&psc->sc_sc);
  347 
  348         return (0);
  349 }
  350 
  351 static device_method_t ath_ahb_methods[] = {
  352         /* Device interface */
  353         DEVMETHOD(device_probe,         ath_ahb_probe),
  354         DEVMETHOD(device_attach,        ath_ahb_attach),
  355         DEVMETHOD(device_detach,        ath_ahb_detach),
  356         DEVMETHOD(device_shutdown,      ath_ahb_shutdown),
  357         DEVMETHOD(device_suspend,       ath_ahb_suspend),
  358         DEVMETHOD(device_resume,        ath_ahb_resume),
  359 
  360         { 0,0 }
  361 };
  362 static driver_t ath_ahb_driver = {
  363         "ath",
  364         ath_ahb_methods,
  365         sizeof (struct ath_ahb_softc)
  366 };
  367 static  devclass_t ath_devclass;
  368 DRIVER_MODULE(ath, nexus, ath_ahb_driver, ath_devclass, 0, 0);
  369 DRIVER_MODULE(ath, apb, ath_ahb_driver, ath_devclass, 0, 0);
  370 MODULE_VERSION(ath, 1);
  371 MODULE_DEPEND(ath, wlan, 1, 1, 1);              /* 802.11 media layer */
  372 MODULE_DEPEND(ath, if_ath, 1, 1, 1);            /* if_ath driver */
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FreeBSD/Linux Kernel Cross Reference sys/dev/ath/if_ath_ahb.c

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