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 * $FreeBSD: head/sys/dev/ath/if_ath_pci.c 192147 2009-05-15 17:02:11Z imp $ 30 */ 31 32 /* 33 * PCI/Cardbus front-end for the Atheros Wireless LAN controller driver. 34 */ 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/module.h> 39 #include <sys/kernel.h> 40 #include <sys/lock.h> 41 #include <sys/mutex.h> 42 #include <sys/errno.h> 43 #include <sys/bus.h> 44 #include <sys/rman.h> 45 46 #include <sys/socket.h> 47 48 #include <net/if.h> 49 #include <net/if_media.h> 50 #include <net/if_arp.h> 51 52 #include <netproto/802_11/ieee80211_var.h> 53 54 #include <dev/netif/ath/ath/if_athvar.h> 55 56 #include <bus/pci/pcivar.h> 57 #include <bus/pci/pcireg.h> 58 59 /* 60 * PCI glue. 61 */ 62 63 struct ath_pci_softc { 64 struct ath_softc sc_sc; 65 struct resource *sc_sr; /* memory resource */ 66 struct resource *sc_irq; /* irq resource */ 67 void *sc_ih; /* interrupt handler */ 68 }; 69 70 #define BS_BAR 0x10 71 #define PCIR_RETRY_TIMEOUT 0x41 72 73 static int 74 ath_pci_probe(device_t dev) 75 { 76 const char* devname; 77 78 wlan_serialize_enter(); 79 devname = ath_hal_probe(pci_get_vendor(dev), pci_get_device(dev)); 80 if (devname != NULL) { 81 device_set_desc(dev, devname); 82 wlan_serialize_exit(); 83 return BUS_PROBE_DEFAULT; 84 } 85 wlan_serialize_exit(); 86 return ENXIO; 87 } 88 89 static int 90 ath_pci_attach(device_t dev) 91 { 92 struct ath_pci_softc *psc = device_get_softc(dev); 93 struct ath_softc *sc = &psc->sc_sc; 94 int error = ENXIO; 95 int rid; 96 97 wlan_serialize_enter(); 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_MPSAFE, 142 ath_intr, sc, &psc->sc_ih, 143 &wlan_global_serializer)) { 144 device_printf(dev, "could not establish interrupt\n"); 145 goto bad2; 146 } 147 148 /* 149 * Setup DMA descriptor area. 150 */ 151 if (bus_dma_tag_create(sc->sc_dmat, /* parent */ 152 4, 0, /* alignment, bounds */ 153 BUS_SPACE_MAXADDR_32BIT, /* lowaddr */ 154 BUS_SPACE_MAXADDR, /* highaddr */ 155 NULL, NULL, /* filter, filterarg */ 156 0x3ffff, /* maxsize XXX */ 157 ATH_MAX_SCATTER, /* nsegments */ 158 0x3ffff, /* maxsegsize XXX */ 159 BUS_DMA_ALLOCNOW, /* flags */ 160 &sc->sc_dmat)) { 161 device_printf(dev, "cannot allocate DMA tag\n"); 162 goto bad3; 163 } 164 165 error = ath_attach(pci_get_device(dev), sc); 166 if (error == 0) { /* success */ 167 wlan_serialize_exit(); 168 return 0; 169 } 170 171 bus_dma_tag_destroy(sc->sc_dmat); 172 bad3: 173 bus_teardown_intr(dev, psc->sc_irq, psc->sc_ih); 174 bad2: 175 bus_release_resource(dev, SYS_RES_IRQ, 0, psc->sc_irq); 176 bad1: 177 bus_release_resource(dev, SYS_RES_MEMORY, BS_BAR, psc->sc_sr); 178 bad: 179 wlan_serialize_exit(); 180 return (error); 181 } 182 183 static int 184 ath_pci_detach(device_t dev) 185 { 186 struct ath_pci_softc *psc = device_get_softc(dev); 187 struct ath_softc *sc = &psc->sc_sc; 188 189 wlan_serialize_enter(); 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 wlan_serialize_exit(); 203 return (0); 204 } 205 206 static int 207 ath_pci_shutdown(device_t dev) 208 { 209 struct ath_pci_softc *psc = device_get_softc(dev); 210 211 wlan_serialize_enter(); 212 ath_shutdown(&psc->sc_sc); 213 wlan_serialize_exit(); 214 return (0); 215 } 216 217 static int 218 ath_pci_suspend(device_t dev) 219 { 220 struct ath_pci_softc *psc = device_get_softc(dev); 221 222 wlan_serialize_enter(); 223 ath_suspend(&psc->sc_sc); 224 wlan_serialize_exit(); 225 226 return (0); 227 } 228 229 static int 230 ath_pci_resume(device_t dev) 231 { 232 struct ath_pci_softc *psc = device_get_softc(dev); 233 234 wlan_serialize_enter(); 235 ath_resume(&psc->sc_sc); 236 wlan_serialize_exit(); 237 238 return (0); 239 } 240 241 static device_method_t ath_pci_methods[] = { 242 /* Device interface */ 243 DEVMETHOD(device_probe, ath_pci_probe), 244 DEVMETHOD(device_attach, ath_pci_attach), 245 DEVMETHOD(device_detach, ath_pci_detach), 246 DEVMETHOD(device_shutdown, ath_pci_shutdown), 247 DEVMETHOD(device_suspend, ath_pci_suspend), 248 DEVMETHOD(device_resume, ath_pci_resume), 249 250 { 0,0 } 251 }; 252 static driver_t ath_pci_driver = { 253 "ath", 254 ath_pci_methods, 255 sizeof (struct ath_pci_softc) 256 }; 257 static devclass_t ath_devclass; 258 DRIVER_MODULE(ath, pci, ath_pci_driver, ath_devclass, NULL, NULL); 259 MODULE_VERSION(ath, 1); 260 261 MODULE_DEPEND(ath, ath_hal, 1, 1, 1); /* Atheros HAL */ 262 MODULE_DEPEND(ath, ath_rate, 1, 1, 1); /* rate control algorithm */ 263 MODULE_DEPEND(ath, wlan, 1, 1, 1); /* 802.11 media layer */ 264