1 /* 2 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting 3 * Copyright (c) 2002-2008 Atheros Communications, Inc. 4 * 5 * Permission to use, copy, modify, and/or distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 * 17 * $Id: ar5212_recv.c,v 1.4 2008/11/10 04:08:03 sam Exp $ 18 */ 19 #include "opt_ah.h" 20 21 #include "ah.h" 22 #include "ah_internal.h" 23 24 #include "ar5212/ar5212.h" 25 #include "ar5212/ar5212reg.h" 26 #include "ar5212/ar5212desc.h" 27 28 /* 29 * Get the RXDP. 30 */ 31 uint32_t 32 ar5212GetRxDP(struct ath_hal *ath) 33 { 34 return OS_REG_READ(ath, AR_RXDP); 35 } 36 37 /* 38 * Set the RxDP. 39 */ 40 void 41 ar5212SetRxDP(struct ath_hal *ah, uint32_t rxdp) 42 { 43 OS_REG_WRITE(ah, AR_RXDP, rxdp); 44 HALASSERT(OS_REG_READ(ah, AR_RXDP) == rxdp); 45 } 46 47 /* 48 * Set Receive Enable bits. 49 */ 50 void 51 ar5212EnableReceive(struct ath_hal *ah) 52 { 53 OS_REG_WRITE(ah, AR_CR, AR_CR_RXE); 54 } 55 56 /* 57 * Stop Receive at the DMA engine 58 */ 59 HAL_BOOL 60 ar5212StopDmaReceive(struct ath_hal *ah) 61 { 62 OS_REG_WRITE(ah, AR_CR, AR_CR_RXD); /* Set receive disable bit */ 63 if (!ath_hal_wait(ah, AR_CR, AR_CR_RXE, 0)) { 64 #ifdef AH_DEBUG 65 ath_hal_printf(ah, "%s: dma failed to stop in 10ms\n" 66 "AR_CR=0x%08x\nAR_DIAG_SW=0x%08x\n", 67 __func__, 68 OS_REG_READ(ah, AR_CR), 69 OS_REG_READ(ah, AR_DIAG_SW)); 70 #endif 71 return AH_FALSE; 72 } else { 73 return AH_TRUE; 74 } 75 } 76 77 /* 78 * Start Transmit at the PCU engine (unpause receive) 79 */ 80 void 81 ar5212StartPcuReceive(struct ath_hal *ah) 82 { 83 struct ath_hal_private *ahp = AH_PRIVATE(ah); 84 85 OS_REG_WRITE(ah, AR_DIAG_SW, 86 OS_REG_READ(ah, AR_DIAG_SW) &~ AR_DIAG_RX_DIS); 87 ar5212EnableMibCounters(ah); 88 /* NB: restore current settings */ 89 ar5212AniReset(ah, ahp->ah_curchan, ahp->ah_opmode, AH_TRUE); 90 } 91 92 /* 93 * Stop Transmit at the PCU engine (pause receive) 94 */ 95 void 96 ar5212StopPcuReceive(struct ath_hal *ah) 97 { 98 OS_REG_WRITE(ah, AR_DIAG_SW, 99 OS_REG_READ(ah, AR_DIAG_SW) | AR_DIAG_RX_DIS); 100 ar5212DisableMibCounters(ah); 101 } 102 103 /* 104 * Set multicast filter 0 (lower 32-bits) 105 * filter 1 (upper 32-bits) 106 */ 107 void 108 ar5212SetMulticastFilter(struct ath_hal *ah, uint32_t filter0, uint32_t filter1) 109 { 110 OS_REG_WRITE(ah, AR_MCAST_FIL0, filter0); 111 OS_REG_WRITE(ah, AR_MCAST_FIL1, filter1); 112 } 113 114 /* 115 * Clear multicast filter by index 116 */ 117 HAL_BOOL 118 ar5212ClrMulticastFilterIndex(struct ath_hal *ah, uint32_t ix) 119 { 120 uint32_t val; 121 122 if (ix >= 64) 123 return AH_FALSE; 124 if (ix >= 32) { 125 val = OS_REG_READ(ah, AR_MCAST_FIL1); 126 OS_REG_WRITE(ah, AR_MCAST_FIL1, (val &~ (1<<(ix-32)))); 127 } else { 128 val = OS_REG_READ(ah, AR_MCAST_FIL0); 129 OS_REG_WRITE(ah, AR_MCAST_FIL0, (val &~ (1<<ix))); 130 } 131 return AH_TRUE; 132 } 133 134 /* 135 * Set multicast filter by index 136 */ 137 HAL_BOOL 138 ar5212SetMulticastFilterIndex(struct ath_hal *ah, uint32_t ix) 139 { 140 uint32_t val; 141 142 if (ix >= 64) 143 return AH_FALSE; 144 if (ix >= 32) { 145 val = OS_REG_READ(ah, AR_MCAST_FIL1); 146 OS_REG_WRITE(ah, AR_MCAST_FIL1, (val | (1<<(ix-32)))); 147 } else { 148 val = OS_REG_READ(ah, AR_MCAST_FIL0); 149 OS_REG_WRITE(ah, AR_MCAST_FIL0, (val | (1<<ix))); 150 } 151 return AH_TRUE; 152 } 153 154 /* 155 * Get the receive filter. 156 */ 157 uint32_t 158 ar5212GetRxFilter(struct ath_hal *ah) 159 { 160 uint32_t bits = OS_REG_READ(ah, AR_RX_FILTER); 161 uint32_t phybits = OS_REG_READ(ah, AR_PHY_ERR); 162 if (phybits & AR_PHY_ERR_RADAR) 163 bits |= HAL_RX_FILTER_PHYRADAR; 164 if (phybits & (AR_PHY_ERR_OFDM_TIMING|AR_PHY_ERR_CCK_TIMING)) 165 bits |= HAL_RX_FILTER_PHYERR; 166 return bits; 167 } 168 169 /* 170 * Set the receive filter. 171 */ 172 void 173 ar5212SetRxFilter(struct ath_hal *ah, uint32_t bits) 174 { 175 uint32_t phybits; 176 177 OS_REG_WRITE(ah, AR_RX_FILTER, 178 bits &~ (HAL_RX_FILTER_PHYRADAR|HAL_RX_FILTER_PHYERR)); 179 phybits = 0; 180 if (bits & HAL_RX_FILTER_PHYRADAR) 181 phybits |= AR_PHY_ERR_RADAR; 182 if (bits & HAL_RX_FILTER_PHYERR) 183 phybits |= AR_PHY_ERR_OFDM_TIMING | AR_PHY_ERR_CCK_TIMING; 184 OS_REG_WRITE(ah, AR_PHY_ERR, phybits); 185 if (phybits) { 186 OS_REG_WRITE(ah, AR_RXCFG, 187 OS_REG_READ(ah, AR_RXCFG) | AR_RXCFG_ZLFDMA); 188 } else { 189 OS_REG_WRITE(ah, AR_RXCFG, 190 OS_REG_READ(ah, AR_RXCFG) &~ AR_RXCFG_ZLFDMA); 191 } 192 } 193 194 /* 195 * Initialize RX descriptor, by clearing the status and setting 196 * the size (and any other flags). 197 */ 198 HAL_BOOL 199 ar5212SetupRxDesc(struct ath_hal *ah, struct ath_desc *ds, 200 uint32_t size, u_int flags) 201 { 202 struct ar5212_desc *ads = AR5212DESC(ds); 203 204 HALASSERT((size &~ AR_BufLen) == 0); 205 206 ads->ds_ctl0 = 0; 207 ads->ds_ctl1 = size & AR_BufLen; 208 209 if (flags & HAL_RXDESC_INTREQ) 210 ads->ds_ctl1 |= AR_RxInterReq; 211 ads->ds_rxstatus0 = ads->ds_rxstatus1 = 0; 212 213 return AH_TRUE; 214 } 215 216 /* 217 * Process an RX descriptor, and return the status to the caller. 218 * Copy some hardware specific items into the software portion 219 * of the descriptor. 220 * 221 * NB: the caller is responsible for validating the memory contents 222 * of the descriptor (e.g. flushing any cached copy). 223 */ 224 HAL_STATUS 225 ar5212ProcRxDesc(struct ath_hal *ah, struct ath_desc *ds, 226 uint32_t pa, struct ath_desc *nds, uint64_t tsf, 227 struct ath_rx_status *rs) 228 { 229 struct ar5212_desc *ads = AR5212DESC(ds); 230 struct ar5212_desc *ands = AR5212DESC(nds); 231 232 if ((ads->ds_rxstatus1 & AR_Done) == 0) 233 return HAL_EINPROGRESS; 234 /* 235 * Given the use of a self-linked tail be very sure that the hw is 236 * done with this descriptor; the hw may have done this descriptor 237 * once and picked it up again...make sure the hw has moved on. 238 */ 239 if ((ands->ds_rxstatus1&AR_Done) == 0 && OS_REG_READ(ah, AR_RXDP) == pa) 240 return HAL_EINPROGRESS; 241 242 rs->rs_datalen = ads->ds_rxstatus0 & AR_DataLen; 243 rs->rs_tstamp = MS(ads->ds_rxstatus1, AR_RcvTimestamp); 244 rs->rs_status = 0; 245 /* XXX what about KeyCacheMiss? */ 246 rs->rs_rssi = MS(ads->ds_rxstatus0, AR_RcvSigStrength); 247 /* discard invalid h/w rssi data */ 248 if (rs->rs_rssi == -128) 249 rs->rs_rssi = 0; 250 if (ads->ds_rxstatus1 & AR_KeyIdxValid) 251 rs->rs_keyix = MS(ads->ds_rxstatus1, AR_KeyIdx); 252 else 253 rs->rs_keyix = HAL_RXKEYIX_INVALID; 254 /* NB: caller expected to do rate table mapping */ 255 rs->rs_rate = MS(ads->ds_rxstatus0, AR_RcvRate); 256 rs->rs_antenna = MS(ads->ds_rxstatus0, AR_RcvAntenna); 257 rs->rs_more = (ads->ds_rxstatus0 & AR_More) ? 1 : 0; 258 259 if ((ads->ds_rxstatus1 & AR_FrmRcvOK) == 0) { 260 /* 261 * These four bits should not be set together. The 262 * 5212 spec states a Michael error can only occur if 263 * DecryptCRCErr not set (and TKIP is used). Experience 264 * indicates however that you can also get Michael errors 265 * when a CRC error is detected, but these are specious. 266 * Consequently we filter them out here so we don't 267 * confuse and/or complicate drivers. 268 */ 269 if (ads->ds_rxstatus1 & AR_CRCErr) 270 rs->rs_status |= HAL_RXERR_CRC; 271 else if (ads->ds_rxstatus1 & AR_PHYErr) { 272 u_int phyerr; 273 274 rs->rs_status |= HAL_RXERR_PHY; 275 phyerr = MS(ads->ds_rxstatus1, AR_PHYErrCode); 276 rs->rs_phyerr = phyerr; 277 if (!AH5212(ah)->ah_hasHwPhyCounters && 278 phyerr != HAL_PHYERR_RADAR) 279 ar5212AniPhyErrReport(ah, rs); 280 } else if (ads->ds_rxstatus1 & AR_DecryptCRCErr) 281 rs->rs_status |= HAL_RXERR_DECRYPT; 282 else if (ads->ds_rxstatus1 & AR_MichaelErr) 283 rs->rs_status |= HAL_RXERR_MIC; 284 } 285 return HAL_OK; 286 } 287