1 /* $NetBSD: if_ath_pci.c,v 1.33 2009/05/06 09:25:15 cegger Exp $ */ 2 3 /*- 4 * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer, 12 * without modification. 13 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 14 * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any 15 * redistribution must be conditioned upon including a substantially 16 * similar Disclaimer requirement for further binary redistribution. 17 * 3. Neither the names of the above-listed copyright holders nor the names 18 * of any contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * Alternatively, this software may be distributed under the terms of the 22 * GNU General Public License ("GPL") version 2 as published by the Free 23 * Software Foundation. 24 * 25 * NO WARRANTY 26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 28 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY 29 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 30 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, 31 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 34 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 36 * THE POSSIBILITY OF SUCH DAMAGES. 37 */ 38 39 #include <sys/cdefs.h> 40 #ifdef __FreeBSD__ 41 __FBSDID("$FreeBSD: src/sys/dev/ath/if_ath_pci.c,v 1.11 2005/01/18 18:08:16 sam Exp $"); 42 #endif 43 #ifdef __NetBSD__ 44 __KERNEL_RCSID(0, "$NetBSD: if_ath_pci.c,v 1.33 2009/05/06 09:25:15 cegger Exp $"); 45 #endif 46 47 /* 48 * PCI/Cardbus front-end for the Atheros Wireless LAN controller driver. 49 */ 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/mbuf.h> 54 #include <sys/malloc.h> 55 #include <sys/kernel.h> 56 #include <sys/socket.h> 57 #include <sys/errno.h> 58 #include <sys/device.h> 59 60 #include <net/if.h> 61 #include <net/if_media.h> 62 #include <net/if_ether.h> 63 64 #include <net80211/ieee80211_netbsd.h> 65 #include <net80211/ieee80211_var.h> 66 67 #ifdef INET 68 #include <netinet/in.h> 69 #endif 70 71 #include <external/isc/atheros_hal/dist/ah.h> 72 73 #include <dev/ic/ath_netbsd.h> 74 #include <dev/ic/athvar.h> 75 76 #include <dev/pci/pcivar.h> 77 #include <dev/pci/pcireg.h> 78 #include <dev/pci/pcidevs.h> 79 80 /* 81 * PCI glue. 82 */ 83 84 struct ath_pci_softc { 85 struct ath_softc sc_sc; 86 pci_chipset_tag_t sc_pc; 87 pcitag_t sc_pcitag; 88 pci_intr_handle_t sc_pih; 89 void *sc_ih; /* interrupt handler */ 90 bus_space_tag_t sc_iot; 91 bus_space_handle_t sc_ioh; 92 bus_size_t sc_mapsz; 93 }; 94 95 #define BS_BAR 0x10 96 97 static void ath_pci_attach(device_t, device_t, void *); 98 static int ath_pci_detach(device_t, int); 99 static int ath_pci_match(device_t, cfdata_t, void *); 100 static int ath_pci_detach(device_t, int); 101 102 CFATTACH_DECL_NEW(ath_pci, 103 sizeof(struct ath_pci_softc), 104 ath_pci_match, 105 ath_pci_attach, 106 ath_pci_detach, 107 NULL); 108 109 static int 110 ath_pci_match(device_t parent, cfdata_t match, void *aux) 111 { 112 const char* devname; 113 struct pci_attach_args *pa = aux; 114 115 devname = ath_hal_probe(PCI_VENDOR(pa->pa_id), PCI_PRODUCT(pa->pa_id)); 116 if (devname != NULL) 117 return 1; 118 return 0; 119 } 120 121 static bool 122 ath_pci_suspend(device_t self PMF_FN_ARGS) 123 { 124 struct ath_pci_softc *sc = device_private(self); 125 126 ath_suspend(&sc->sc_sc); 127 pci_intr_disestablish(sc->sc_pc, sc->sc_ih); 128 sc->sc_ih = NULL; 129 130 return true; 131 } 132 133 static bool 134 ath_pci_resume(device_t self PMF_FN_ARGS) 135 { 136 struct ath_pci_softc *sc = device_private(self); 137 138 sc->sc_ih = pci_intr_establish(sc->sc_pc, sc->sc_pih, IPL_NET, ath_intr, 139 &sc->sc_sc); 140 if (sc->sc_ih == NULL) { 141 aprint_error_dev(self, "couldn't map interrupt\n"); 142 return false; 143 } 144 ath_resume(&sc->sc_sc); 145 146 return true; 147 } 148 149 static int 150 ath_pci_setup(struct ath_pci_softc *sc) 151 { 152 pcireg_t bhlc, csr, icr, lattimer; 153 /* 154 * Enable memory mapping and bus mastering. 155 */ 156 csr = pci_conf_read(sc->sc_pc, sc->sc_pcitag, PCI_COMMAND_STATUS_REG); 157 csr |= PCI_COMMAND_MASTER_ENABLE | PCI_COMMAND_MEM_ENABLE; 158 pci_conf_write(sc->sc_pc, sc->sc_pcitag, PCI_COMMAND_STATUS_REG, csr); 159 csr = pci_conf_read(sc->sc_pc, sc->sc_pcitag, PCI_COMMAND_STATUS_REG); 160 161 if ((csr & PCI_COMMAND_MEM_ENABLE) == 0) { 162 aprint_error("couldn't enable memory mapping\n"); 163 return 0; 164 } 165 if ((csr & PCI_COMMAND_MASTER_ENABLE) == 0) { 166 aprint_error("couldn't enable bus mastering\n"); 167 return 0; 168 } 169 170 /* 171 * XXX Both this comment and code are replicated in 172 * XXX cardbus_rescan(). 173 * 174 * Make sure the latency timer is set to some reasonable 175 * value. 176 * 177 * I will set the initial value of the Latency Timer here. 178 * 179 * While a PCI device owns the bus, its Latency Timer counts 180 * down bus cycles from its initial value to 0. Minimum 181 * Grant tells for how long the device wants to own the 182 * bus once it gets access, in units of 250ns. 183 * 184 * On a 33 MHz bus, there are 8 cycles per 250ns. So I 185 * multiply the Minimum Grant by 8 to find out the initial 186 * value of the Latency Timer. 187 * 188 * I never set a Latency Timer less than 0x10, since that 189 * is what the old code did. 190 */ 191 bhlc = pci_conf_read(sc->sc_pc, sc->sc_pcitag, PCI_BHLC_REG); 192 icr = pci_conf_read(sc->sc_pc, sc->sc_pcitag, PCI_INTERRUPT_REG); 193 lattimer = MAX(0x10, MIN(0xf8, 8 * PCI_MIN_GNT(icr))); 194 if (PCI_LATTIMER(bhlc) < lattimer) { 195 bhlc &= ~(PCI_LATTIMER_MASK << PCI_LATTIMER_SHIFT); 196 bhlc |= (lattimer << PCI_LATTIMER_SHIFT); 197 pci_conf_write(sc->sc_pc, sc->sc_pcitag, PCI_BHLC_REG, bhlc); 198 } 199 return 1; 200 } 201 202 static void 203 ath_pci_attach(device_t parent, device_t self, void *aux) 204 { 205 struct ath_pci_softc *psc = device_private(self); 206 struct ath_softc *sc = &psc->sc_sc; 207 struct pci_attach_args *pa = aux; 208 pci_chipset_tag_t pc = pa->pa_pc; 209 pcireg_t mem_type; 210 const char *intrstr = NULL; 211 212 sc->sc_dev = self; 213 psc->sc_pc = pc; 214 215 psc->sc_pcitag = pa->pa_tag; 216 217 if (!ath_pci_setup(psc)) 218 goto bad; 219 220 /* 221 * Setup memory-mapping of PCI registers. 222 */ 223 mem_type = pci_mapreg_type(pc, pa->pa_tag, BS_BAR); 224 if (mem_type != PCI_MAPREG_TYPE_MEM && 225 mem_type != PCI_MAPREG_MEM_TYPE_64BIT) { 226 aprint_error("bad pci register type %d\n", (int)mem_type); 227 goto bad; 228 } 229 if (pci_mapreg_map(pa, BS_BAR, mem_type, 0, &psc->sc_iot, 230 &psc->sc_ioh, NULL, &psc->sc_mapsz)) { 231 aprint_error("cannot map register space\n"); 232 goto bad; 233 } 234 235 sc->sc_st = HALTAG(psc->sc_iot); 236 sc->sc_sh = HALHANDLE(psc->sc_ioh); 237 238 /* 239 * Arrange interrupt line. 240 */ 241 if (pci_intr_map(pa, &psc->sc_pih)) { 242 aprint_error("couldn't map interrupt\n"); 243 goto bad1; 244 } 245 246 intrstr = pci_intr_string(pc, psc->sc_pih); 247 psc->sc_ih = pci_intr_establish(pc, psc->sc_pih, IPL_NET, ath_intr, sc); 248 if (psc->sc_ih == NULL) { 249 aprint_error("couldn't map interrupt\n"); 250 goto bad2; 251 } 252 253 aprint_normal("\n"); 254 aprint_verbose_dev(self, "interrupting at %s\n", intrstr); 255 256 sc->sc_dmat = pa->pa_dmat; 257 258 ATH_LOCK_INIT(sc); 259 260 if (ath_attach(PCI_PRODUCT(pa->pa_id), sc) != 0) 261 goto bad3; 262 263 if (!pmf_device_register(self, ath_pci_suspend, ath_pci_resume)) 264 aprint_error_dev(self, "couldn't establish power handler\n"); 265 else { 266 pmf_class_network_register(self, &sc->sc_if); 267 pmf_device_suspend_self(self); 268 } 269 return; 270 bad3: 271 ATH_LOCK_DESTROY(sc); 272 273 pci_intr_disestablish(pc, psc->sc_ih); 274 bad2: /* XXX */ 275 bad1: 276 bus_space_unmap(psc->sc_iot, psc->sc_ioh, psc->sc_mapsz); 277 bad: /* XXX */ 278 return; 279 } 280 281 static int 282 ath_pci_detach(device_t self, int flags) 283 { 284 struct ath_pci_softc *psc = device_private(self); 285 286 ath_detach(&psc->sc_sc); 287 pmf_device_deregister(self); 288 if (psc->sc_ih != NULL) 289 pci_intr_disestablish(psc->sc_pc, psc->sc_ih); 290 bus_space_unmap(psc->sc_iot, psc->sc_ioh, psc->sc_mapsz); 291 292 ATH_LOCK_DESTROY(&psc->sc_sc); 293 294 return (0); 295 } 296