1 /* Broadcom NetXtreme-C/E network driver. 2 * 3 * Copyright (c) 2021 Broadcom Inc. 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation. 8 */ 9 #include <linux/kernel.h> 10 #include <linux/errno.h> 11 #include <linux/pci.h> 12 #include <linux/netdevice.h> 13 #include <linux/etherdevice.h> 14 #include <linux/ptp_clock_kernel.h> 15 #include <linux/net_tstamp.h> 16 #include <linux/timecounter.h> 17 #include <linux/timekeeping.h> 18 #include <linux/ptp_classify.h> 19 #include "bnxt_hsi.h" 20 #include "bnxt.h" 21 #include "bnxt_ptp.h" 22 23 int bnxt_ptp_parse(struct sk_buff *skb, u16 *seq_id) 24 { 25 unsigned int ptp_class; 26 struct ptp_header *hdr; 27 28 ptp_class = ptp_classify_raw(skb); 29 30 switch (ptp_class & PTP_CLASS_VMASK) { 31 case PTP_CLASS_V1: 32 case PTP_CLASS_V2: 33 hdr = ptp_parse_header(skb, ptp_class); 34 if (!hdr) 35 return -EINVAL; 36 37 *seq_id = ntohs(hdr->sequence_id); 38 return 0; 39 default: 40 return -ERANGE; 41 } 42 } 43 44 static int bnxt_ptp_settime(struct ptp_clock_info *ptp_info, 45 const struct timespec64 *ts) 46 { 47 struct bnxt_ptp_cfg *ptp = container_of(ptp_info, struct bnxt_ptp_cfg, 48 ptp_info); 49 u64 ns = timespec64_to_ns(ts); 50 51 spin_lock_bh(&ptp->ptp_lock); 52 timecounter_init(&ptp->tc, &ptp->cc, ns); 53 spin_unlock_bh(&ptp->ptp_lock); 54 return 0; 55 } 56 57 /* Caller holds ptp_lock */ 58 static u64 bnxt_refclk_read(struct bnxt *bp, struct ptp_system_timestamp *sts) 59 { 60 struct bnxt_ptp_cfg *ptp = bp->ptp_cfg; 61 u64 ns; 62 63 ptp_read_system_prets(sts); 64 ns = readl(bp->bar0 + ptp->refclk_mapped_regs[0]); 65 ptp_read_system_postts(sts); 66 ns |= (u64)readl(bp->bar0 + ptp->refclk_mapped_regs[1]) << 32; 67 return ns; 68 } 69 70 static void bnxt_ptp_get_current_time(struct bnxt *bp) 71 { 72 struct bnxt_ptp_cfg *ptp = bp->ptp_cfg; 73 74 if (!ptp) 75 return; 76 spin_lock_bh(&ptp->ptp_lock); 77 WRITE_ONCE(ptp->old_time, ptp->current_time); 78 ptp->current_time = bnxt_refclk_read(bp, NULL); 79 spin_unlock_bh(&ptp->ptp_lock); 80 } 81 82 static int bnxt_hwrm_port_ts_query(struct bnxt *bp, u32 flags, u64 *ts) 83 { 84 struct hwrm_port_ts_query_output *resp = bp->hwrm_cmd_resp_addr; 85 struct hwrm_port_ts_query_input req = {0}; 86 int rc; 87 88 bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_PORT_TS_QUERY, -1, -1); 89 req.flags = cpu_to_le32(flags); 90 if ((flags & PORT_TS_QUERY_REQ_FLAGS_PATH) == 91 PORT_TS_QUERY_REQ_FLAGS_PATH_TX) { 92 req.enables = cpu_to_le16(BNXT_PTP_QTS_TX_ENABLES); 93 req.ptp_seq_id = cpu_to_le32(bp->ptp_cfg->tx_seqid); 94 req.ts_req_timeout = cpu_to_le16(BNXT_PTP_QTS_TIMEOUT); 95 } 96 mutex_lock(&bp->hwrm_cmd_lock); 97 rc = _hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT); 98 if (!rc) 99 *ts = le64_to_cpu(resp->ptp_msg_ts); 100 mutex_unlock(&bp->hwrm_cmd_lock); 101 return rc; 102 } 103 104 static int bnxt_ptp_gettimex(struct ptp_clock_info *ptp_info, 105 struct timespec64 *ts, 106 struct ptp_system_timestamp *sts) 107 { 108 struct bnxt_ptp_cfg *ptp = container_of(ptp_info, struct bnxt_ptp_cfg, 109 ptp_info); 110 u64 ns, cycles; 111 112 spin_lock_bh(&ptp->ptp_lock); 113 cycles = bnxt_refclk_read(ptp->bp, sts); 114 ns = timecounter_cyc2time(&ptp->tc, cycles); 115 spin_unlock_bh(&ptp->ptp_lock); 116 *ts = ns_to_timespec64(ns); 117 118 return 0; 119 } 120 121 static int bnxt_ptp_adjtime(struct ptp_clock_info *ptp_info, s64 delta) 122 { 123 struct bnxt_ptp_cfg *ptp = container_of(ptp_info, struct bnxt_ptp_cfg, 124 ptp_info); 125 126 spin_lock_bh(&ptp->ptp_lock); 127 timecounter_adjtime(&ptp->tc, delta); 128 spin_unlock_bh(&ptp->ptp_lock); 129 return 0; 130 } 131 132 static int bnxt_ptp_adjfreq(struct ptp_clock_info *ptp_info, s32 ppb) 133 { 134 struct bnxt_ptp_cfg *ptp = container_of(ptp_info, struct bnxt_ptp_cfg, 135 ptp_info); 136 struct hwrm_port_mac_cfg_input req = {0}; 137 struct bnxt *bp = ptp->bp; 138 int rc; 139 140 bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_PORT_MAC_CFG, -1, -1); 141 req.ptp_freq_adj_ppb = cpu_to_le32(ppb); 142 req.enables = cpu_to_le32(PORT_MAC_CFG_REQ_ENABLES_PTP_FREQ_ADJ_PPB); 143 rc = hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT); 144 if (rc) 145 netdev_err(ptp->bp->dev, 146 "ptp adjfreq failed. rc = %d\n", rc); 147 return rc; 148 } 149 150 static int bnxt_ptp_enable(struct ptp_clock_info *ptp, 151 struct ptp_clock_request *rq, int on) 152 { 153 return -EOPNOTSUPP; 154 } 155 156 static int bnxt_hwrm_ptp_cfg(struct bnxt *bp) 157 { 158 struct hwrm_port_mac_cfg_input req = {0}; 159 struct bnxt_ptp_cfg *ptp = bp->ptp_cfg; 160 u32 flags = 0; 161 162 bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_PORT_MAC_CFG, -1, -1); 163 if (ptp->rx_filter) 164 flags |= PORT_MAC_CFG_REQ_FLAGS_PTP_RX_TS_CAPTURE_ENABLE; 165 else 166 flags |= PORT_MAC_CFG_REQ_FLAGS_PTP_RX_TS_CAPTURE_DISABLE; 167 if (ptp->tx_tstamp_en) 168 flags |= PORT_MAC_CFG_REQ_FLAGS_PTP_TX_TS_CAPTURE_ENABLE; 169 else 170 flags |= PORT_MAC_CFG_REQ_FLAGS_PTP_TX_TS_CAPTURE_DISABLE; 171 req.flags = cpu_to_le32(flags); 172 req.enables = cpu_to_le32(PORT_MAC_CFG_REQ_ENABLES_RX_TS_CAPTURE_PTP_MSG_TYPE); 173 req.rx_ts_capture_ptp_msg_type = cpu_to_le16(ptp->rxctl); 174 175 return hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT); 176 } 177 178 int bnxt_hwtstamp_set(struct net_device *dev, struct ifreq *ifr) 179 { 180 struct bnxt *bp = netdev_priv(dev); 181 struct hwtstamp_config stmpconf; 182 struct bnxt_ptp_cfg *ptp; 183 u16 old_rxctl; 184 int old_rx_filter, rc; 185 u8 old_tx_tstamp_en; 186 187 ptp = bp->ptp_cfg; 188 if (!ptp) 189 return -EOPNOTSUPP; 190 191 if (copy_from_user(&stmpconf, ifr->ifr_data, sizeof(stmpconf))) 192 return -EFAULT; 193 194 if (stmpconf.flags) 195 return -EINVAL; 196 197 if (stmpconf.tx_type != HWTSTAMP_TX_ON && 198 stmpconf.tx_type != HWTSTAMP_TX_OFF) 199 return -ERANGE; 200 201 old_rx_filter = ptp->rx_filter; 202 old_rxctl = ptp->rxctl; 203 old_tx_tstamp_en = ptp->tx_tstamp_en; 204 switch (stmpconf.rx_filter) { 205 case HWTSTAMP_FILTER_NONE: 206 ptp->rxctl = 0; 207 ptp->rx_filter = HWTSTAMP_FILTER_NONE; 208 break; 209 case HWTSTAMP_FILTER_PTP_V2_EVENT: 210 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT: 211 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT: 212 ptp->rxctl = BNXT_PTP_MSG_EVENTS; 213 ptp->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT; 214 break; 215 case HWTSTAMP_FILTER_PTP_V2_SYNC: 216 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC: 217 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC: 218 ptp->rxctl = BNXT_PTP_MSG_SYNC; 219 ptp->rx_filter = HWTSTAMP_FILTER_PTP_V2_SYNC; 220 break; 221 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ: 222 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ: 223 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ: 224 ptp->rxctl = BNXT_PTP_MSG_DELAY_REQ; 225 ptp->rx_filter = HWTSTAMP_FILTER_PTP_V2_DELAY_REQ; 226 break; 227 default: 228 return -ERANGE; 229 } 230 231 if (stmpconf.tx_type == HWTSTAMP_TX_ON) 232 ptp->tx_tstamp_en = 1; 233 else 234 ptp->tx_tstamp_en = 0; 235 236 rc = bnxt_hwrm_ptp_cfg(bp); 237 if (rc) 238 goto ts_set_err; 239 240 stmpconf.rx_filter = ptp->rx_filter; 241 return copy_to_user(ifr->ifr_data, &stmpconf, sizeof(stmpconf)) ? 242 -EFAULT : 0; 243 244 ts_set_err: 245 ptp->rx_filter = old_rx_filter; 246 ptp->rxctl = old_rxctl; 247 ptp->tx_tstamp_en = old_tx_tstamp_en; 248 return rc; 249 } 250 251 int bnxt_hwtstamp_get(struct net_device *dev, struct ifreq *ifr) 252 { 253 struct bnxt *bp = netdev_priv(dev); 254 struct hwtstamp_config stmpconf; 255 struct bnxt_ptp_cfg *ptp; 256 257 ptp = bp->ptp_cfg; 258 if (!ptp) 259 return -EOPNOTSUPP; 260 261 stmpconf.flags = 0; 262 stmpconf.tx_type = ptp->tx_tstamp_en ? HWTSTAMP_TX_ON : HWTSTAMP_TX_OFF; 263 264 stmpconf.rx_filter = ptp->rx_filter; 265 return copy_to_user(ifr->ifr_data, &stmpconf, sizeof(stmpconf)) ? 266 -EFAULT : 0; 267 } 268 269 static int bnxt_map_regs(struct bnxt *bp, u32 *reg_arr, int count, int reg_win) 270 { 271 u32 reg_base = *reg_arr & BNXT_GRC_BASE_MASK; 272 u32 win_off; 273 int i; 274 275 for (i = 0; i < count; i++) { 276 if ((reg_arr[i] & BNXT_GRC_BASE_MASK) != reg_base) 277 return -ERANGE; 278 } 279 win_off = BNXT_GRCPF_REG_WINDOW_BASE_OUT + (reg_win - 1) * 4; 280 writel(reg_base, bp->bar0 + win_off); 281 return 0; 282 } 283 284 static int bnxt_map_ptp_regs(struct bnxt *bp) 285 { 286 struct bnxt_ptp_cfg *ptp = bp->ptp_cfg; 287 u32 *reg_arr; 288 int rc, i; 289 290 reg_arr = ptp->refclk_regs; 291 if (bp->flags & BNXT_FLAG_CHIP_P5) { 292 rc = bnxt_map_regs(bp, reg_arr, 2, BNXT_PTP_GRC_WIN); 293 if (rc) 294 return rc; 295 for (i = 0; i < 2; i++) 296 ptp->refclk_mapped_regs[i] = BNXT_PTP_GRC_WIN_BASE + 297 (ptp->refclk_regs[i] & BNXT_GRC_OFFSET_MASK); 298 return 0; 299 } 300 return -ENODEV; 301 } 302 303 static void bnxt_unmap_ptp_regs(struct bnxt *bp) 304 { 305 writel(0, bp->bar0 + BNXT_GRCPF_REG_WINDOW_BASE_OUT + 306 (BNXT_PTP_GRC_WIN - 1) * 4); 307 } 308 309 static u64 bnxt_cc_read(const struct cyclecounter *cc) 310 { 311 struct bnxt_ptp_cfg *ptp = container_of(cc, struct bnxt_ptp_cfg, cc); 312 313 return bnxt_refclk_read(ptp->bp, NULL); 314 } 315 316 static void bnxt_stamp_tx_skb(struct bnxt *bp, struct sk_buff *skb) 317 { 318 struct bnxt_ptp_cfg *ptp = bp->ptp_cfg; 319 struct skb_shared_hwtstamps timestamp; 320 u64 ts = 0, ns = 0; 321 int rc; 322 323 rc = bnxt_hwrm_port_ts_query(bp, PORT_TS_QUERY_REQ_FLAGS_PATH_TX, &ts); 324 if (!rc) { 325 memset(×tamp, 0, sizeof(timestamp)); 326 spin_lock_bh(&ptp->ptp_lock); 327 ns = timecounter_cyc2time(&ptp->tc, ts); 328 spin_unlock_bh(&ptp->ptp_lock); 329 timestamp.hwtstamp = ns_to_ktime(ns); 330 skb_tstamp_tx(ptp->tx_skb, ×tamp); 331 } else { 332 netdev_err(bp->dev, "TS query for TX timer failed rc = %x\n", 333 rc); 334 } 335 336 dev_kfree_skb_any(ptp->tx_skb); 337 ptp->tx_skb = NULL; 338 atomic_inc(&ptp->tx_avail); 339 } 340 341 static long bnxt_ptp_ts_aux_work(struct ptp_clock_info *ptp_info) 342 { 343 struct bnxt_ptp_cfg *ptp = container_of(ptp_info, struct bnxt_ptp_cfg, 344 ptp_info); 345 unsigned long now = jiffies; 346 struct bnxt *bp = ptp->bp; 347 348 if (ptp->tx_skb) 349 bnxt_stamp_tx_skb(bp, ptp->tx_skb); 350 351 if (!time_after_eq(now, ptp->next_period)) 352 return ptp->next_period - now; 353 354 bnxt_ptp_get_current_time(bp); 355 ptp->next_period = now + HZ; 356 if (time_after_eq(now, ptp->next_overflow_check)) { 357 spin_lock_bh(&ptp->ptp_lock); 358 timecounter_read(&ptp->tc); 359 spin_unlock_bh(&ptp->ptp_lock); 360 ptp->next_overflow_check = now + BNXT_PHC_OVERFLOW_PERIOD; 361 } 362 return HZ; 363 } 364 365 int bnxt_get_tx_ts_p5(struct bnxt *bp, struct sk_buff *skb) 366 { 367 struct bnxt_ptp_cfg *ptp = bp->ptp_cfg; 368 369 if (ptp->tx_skb) { 370 netdev_err(bp->dev, "deferring skb:one SKB is still outstanding\n"); 371 return -EBUSY; 372 } 373 ptp->tx_skb = skb; 374 ptp_schedule_worker(ptp->ptp_clock, 0); 375 return 0; 376 } 377 378 int bnxt_get_rx_ts_p5(struct bnxt *bp, u64 *ts, u32 pkt_ts) 379 { 380 struct bnxt_ptp_cfg *ptp = bp->ptp_cfg; 381 u64 time; 382 383 if (!ptp) 384 return -ENODEV; 385 386 BNXT_READ_TIME64(ptp, time, ptp->old_time); 387 *ts = (time & BNXT_HI_TIMER_MASK) | pkt_ts; 388 if (pkt_ts < (time & BNXT_LO_TIMER_MASK)) 389 *ts += BNXT_LO_TIMER_MASK + 1; 390 391 return 0; 392 } 393 394 static const struct ptp_clock_info bnxt_ptp_caps = { 395 .owner = THIS_MODULE, 396 .name = "bnxt clock", 397 .max_adj = BNXT_MAX_PHC_DRIFT, 398 .n_alarm = 0, 399 .n_ext_ts = 0, 400 .n_per_out = 0, 401 .n_pins = 0, 402 .pps = 0, 403 .adjfreq = bnxt_ptp_adjfreq, 404 .adjtime = bnxt_ptp_adjtime, 405 .do_aux_work = bnxt_ptp_ts_aux_work, 406 .gettimex64 = bnxt_ptp_gettimex, 407 .settime64 = bnxt_ptp_settime, 408 .enable = bnxt_ptp_enable, 409 }; 410 411 int bnxt_ptp_init(struct bnxt *bp) 412 { 413 struct bnxt_ptp_cfg *ptp = bp->ptp_cfg; 414 int rc; 415 416 if (!ptp) 417 return 0; 418 419 rc = bnxt_map_ptp_regs(bp); 420 if (rc) 421 return rc; 422 423 atomic_set(&ptp->tx_avail, BNXT_MAX_TX_TS); 424 spin_lock_init(&ptp->ptp_lock); 425 426 memset(&ptp->cc, 0, sizeof(ptp->cc)); 427 ptp->cc.read = bnxt_cc_read; 428 ptp->cc.mask = CYCLECOUNTER_MASK(48); 429 ptp->cc.shift = 0; 430 ptp->cc.mult = 1; 431 432 ptp->next_overflow_check = jiffies + BNXT_PHC_OVERFLOW_PERIOD; 433 timecounter_init(&ptp->tc, &ptp->cc, ktime_to_ns(ktime_get_real())); 434 435 ptp->ptp_info = bnxt_ptp_caps; 436 ptp->ptp_clock = ptp_clock_register(&ptp->ptp_info, &bp->pdev->dev); 437 if (IS_ERR(ptp->ptp_clock)) { 438 int err = PTR_ERR(ptp->ptp_clock); 439 440 ptp->ptp_clock = NULL; 441 bnxt_unmap_ptp_regs(bp); 442 return err; 443 } 444 if (bp->flags & BNXT_FLAG_CHIP_P5) { 445 spin_lock_bh(&ptp->ptp_lock); 446 ptp->current_time = bnxt_refclk_read(bp, NULL); 447 WRITE_ONCE(ptp->old_time, ptp->current_time); 448 spin_unlock_bh(&ptp->ptp_lock); 449 ptp_schedule_worker(ptp->ptp_clock, 0); 450 } 451 return 0; 452 } 453 454 void bnxt_ptp_clear(struct bnxt *bp) 455 { 456 struct bnxt_ptp_cfg *ptp = bp->ptp_cfg; 457 458 if (!ptp) 459 return; 460 461 if (ptp->ptp_clock) 462 ptp_clock_unregister(ptp->ptp_clock); 463 464 ptp->ptp_clock = NULL; 465 if (ptp->tx_skb) { 466 dev_kfree_skb_any(ptp->tx_skb); 467 ptp->tx_skb = NULL; 468 } 469 bnxt_unmap_ptp_regs(bp); 470 } 471