1// SPDX-License-Identifier: GPL-2.0+ 2/* PTP 1588 clock using the Renesas Ethernet AVB 3 * 4 * Copyright (C) 2013-2015 Renesas Electronics Corporation 5 * Copyright (C) 2015 Renesas Solutions Corp. 6 * Copyright (C) 2015-2016 Cogent Embedded, Inc. <source@cogentembedded.com> 7 */ 8 9#include "ravb.h" 10 11static int ravb_ptp_tcr_request(struct ravb_private *priv, u32 request) 12{ 13 struct net_device *ndev = priv->ndev; 14 int error; 15 16 error = ravb_wait(ndev, GCCR, GCCR_TCR, GCCR_TCR_NOREQ); 17 if (error) 18 return error; 19 20 ravb_modify(ndev, GCCR, request, request); 21 return ravb_wait(ndev, GCCR, GCCR_TCR, GCCR_TCR_NOREQ); 22} 23 24/* Caller must hold the lock */ 25static int ravb_ptp_time_read(struct ravb_private *priv, struct timespec64 *ts) 26{ 27 struct net_device *ndev = priv->ndev; 28 int error; 29 30 error = ravb_ptp_tcr_request(priv, GCCR_TCR_CAPTURE); 31 if (error) 32 return error; 33 34 ts->tv_nsec = ravb_read(ndev, GCT0); 35 ts->tv_sec = ravb_read(ndev, GCT1) | 36 ((s64)ravb_read(ndev, GCT2) << 32); 37 38 return 0; 39} 40 41/* Caller must hold the lock */ 42static int ravb_ptp_time_write(struct ravb_private *priv, 43 const struct timespec64 *ts) 44{ 45 struct net_device *ndev = priv->ndev; 46 int error; 47 u32 gccr; 48 49 error = ravb_ptp_tcr_request(priv, GCCR_TCR_RESET); 50 if (error) 51 return error; 52 53 gccr = ravb_read(ndev, GCCR); 54 if (gccr & GCCR_LTO) 55 return -EBUSY; 56 ravb_write(ndev, ts->tv_nsec, GTO0); 57 ravb_write(ndev, ts->tv_sec, GTO1); 58 ravb_write(ndev, (ts->tv_sec >> 32) & 0xffff, GTO2); 59 ravb_write(ndev, gccr | GCCR_LTO, GCCR); 60 61 return 0; 62} 63 64/* Caller must hold the lock */ 65static int ravb_ptp_update_compare(struct ravb_private *priv, u32 ns) 66{ 67 struct net_device *ndev = priv->ndev; 68 /* When the comparison value (GPTC.PTCV) is in range of 69 * [x-1 to x+1] (x is the configured increment value in 70 * GTI.TIV), it may happen that a comparison match is 71 * not detected when the timer wraps around. 72 */ 73 u32 gti_ns_plus_1 = (priv->ptp.current_addend >> 20) + 1; 74 u32 gccr; 75 76 if (ns < gti_ns_plus_1) 77 ns = gti_ns_plus_1; 78 else if (ns > 0 - gti_ns_plus_1) 79 ns = 0 - gti_ns_plus_1; 80 81 gccr = ravb_read(ndev, GCCR); 82 if (gccr & GCCR_LPTC) 83 return -EBUSY; 84 ravb_write(ndev, ns, GPTC); 85 ravb_write(ndev, gccr | GCCR_LPTC, GCCR); 86 87 return 0; 88} 89 90/* PTP clock operations */ 91static int ravb_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm) 92{ 93 struct ravb_private *priv = container_of(ptp, struct ravb_private, 94 ptp.info); 95 struct net_device *ndev = priv->ndev; 96 unsigned long flags; 97 u32 addend; 98 u32 gccr; 99 100 addend = (u32)adjust_by_scaled_ppm(priv->ptp.default_addend, 101 scaled_ppm); 102 103 spin_lock_irqsave(&priv->lock, flags); 104 105 priv->ptp.current_addend = addend; 106 107 gccr = ravb_read(ndev, GCCR); 108 if (gccr & GCCR_LTI) { 109 spin_unlock_irqrestore(&priv->lock, flags); 110 return -EBUSY; 111 } 112 ravb_write(ndev, addend & GTI_TIV, GTI); 113 ravb_write(ndev, gccr | GCCR_LTI, GCCR); 114 115 spin_unlock_irqrestore(&priv->lock, flags); 116 117 return 0; 118} 119 120static int ravb_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta) 121{ 122 struct ravb_private *priv = container_of(ptp, struct ravb_private, 123 ptp.info); 124 struct timespec64 ts; 125 unsigned long flags; 126 int error; 127 128 spin_lock_irqsave(&priv->lock, flags); 129 error = ravb_ptp_time_read(priv, &ts); 130 if (!error) { 131 u64 now = ktime_to_ns(timespec64_to_ktime(ts)); 132 133 ts = ns_to_timespec64(now + delta); 134 error = ravb_ptp_time_write(priv, &ts); 135 } 136 spin_unlock_irqrestore(&priv->lock, flags); 137 138 return error; 139} 140 141static int ravb_ptp_gettime64(struct ptp_clock_info *ptp, struct timespec64 *ts) 142{ 143 struct ravb_private *priv = container_of(ptp, struct ravb_private, 144 ptp.info); 145 unsigned long flags; 146 int error; 147 148 spin_lock_irqsave(&priv->lock, flags); 149 error = ravb_ptp_time_read(priv, ts); 150 spin_unlock_irqrestore(&priv->lock, flags); 151 152 return error; 153} 154 155static int ravb_ptp_settime64(struct ptp_clock_info *ptp, 156 const struct timespec64 *ts) 157{ 158 struct ravb_private *priv = container_of(ptp, struct ravb_private, 159 ptp.info); 160 unsigned long flags; 161 int error; 162 163 spin_lock_irqsave(&priv->lock, flags); 164 error = ravb_ptp_time_write(priv, ts); 165 spin_unlock_irqrestore(&priv->lock, flags); 166 167 return error; 168} 169 170static int ravb_ptp_extts(struct ptp_clock_info *ptp, 171 struct ptp_extts_request *req, int on) 172{ 173 struct ravb_private *priv = container_of(ptp, struct ravb_private, 174 ptp.info); 175 const struct ravb_hw_info *info = priv->info; 176 struct net_device *ndev = priv->ndev; 177 unsigned long flags; 178 179 /* Reject requests with unsupported flags */ 180 if (req->flags & ~(PTP_ENABLE_FEATURE | 181 PTP_RISING_EDGE | 182 PTP_FALLING_EDGE | 183 PTP_STRICT_FLAGS)) 184 return -EOPNOTSUPP; 185 186 if (req->index) 187 return -EINVAL; 188 189 if (priv->ptp.extts[req->index] == on) 190 return 0; 191 priv->ptp.extts[req->index] = on; 192 193 spin_lock_irqsave(&priv->lock, flags); 194 if (!info->irq_en_dis) 195 ravb_modify(ndev, GIC, GIC_PTCE, on ? GIC_PTCE : 0); 196 else if (on) 197 ravb_write(ndev, GIE_PTCS, GIE); 198 else 199 ravb_write(ndev, GID_PTCD, GID); 200 spin_unlock_irqrestore(&priv->lock, flags); 201 202 return 0; 203} 204 205static int ravb_ptp_perout(struct ptp_clock_info *ptp, 206 struct ptp_perout_request *req, int on) 207{ 208 struct ravb_private *priv = container_of(ptp, struct ravb_private, 209 ptp.info); 210 const struct ravb_hw_info *info = priv->info; 211 struct net_device *ndev = priv->ndev; 212 struct ravb_ptp_perout *perout; 213 unsigned long flags; 214 int error = 0; 215 216 /* Reject requests with unsupported flags */ 217 if (req->flags) 218 return -EOPNOTSUPP; 219 220 if (req->index) 221 return -EINVAL; 222 223 if (on) { 224 u64 start_ns; 225 u64 period_ns; 226 227 start_ns = req->start.sec * NSEC_PER_SEC + req->start.nsec; 228 period_ns = req->period.sec * NSEC_PER_SEC + req->period.nsec; 229 230 if (start_ns > U32_MAX) { 231 netdev_warn(ndev, 232 "ptp: start value (nsec) is over limit. Maximum size of start is only 32 bits\n"); 233 return -ERANGE; 234 } 235 236 if (period_ns > U32_MAX) { 237 netdev_warn(ndev, 238 "ptp: period value (nsec) is over limit. Maximum size of period is only 32 bits\n"); 239 return -ERANGE; 240 } 241 242 spin_lock_irqsave(&priv->lock, flags); 243 244 perout = &priv->ptp.perout[req->index]; 245 perout->target = (u32)start_ns; 246 perout->period = (u32)period_ns; 247 error = ravb_ptp_update_compare(priv, (u32)start_ns); 248 if (!error) { 249 /* Unmask interrupt */ 250 if (!info->irq_en_dis) 251 ravb_modify(ndev, GIC, GIC_PTME, GIC_PTME); 252 else 253 ravb_write(ndev, GIE_PTMS0, GIE); 254 } 255 } else { 256 spin_lock_irqsave(&priv->lock, flags); 257 258 perout = &priv->ptp.perout[req->index]; 259 perout->period = 0; 260 261 /* Mask interrupt */ 262 if (!info->irq_en_dis) 263 ravb_modify(ndev, GIC, GIC_PTME, 0); 264 else 265 ravb_write(ndev, GID_PTMD0, GID); 266 } 267 spin_unlock_irqrestore(&priv->lock, flags); 268 269 return error; 270} 271 272static int ravb_ptp_enable(struct ptp_clock_info *ptp, 273 struct ptp_clock_request *req, int on) 274{ 275 switch (req->type) { 276 case PTP_CLK_REQ_EXTTS: 277 return ravb_ptp_extts(ptp, &req->extts, on); 278 case PTP_CLK_REQ_PEROUT: 279 return ravb_ptp_perout(ptp, &req->perout, on); 280 default: 281 return -EOPNOTSUPP; 282 } 283} 284 285static const struct ptp_clock_info ravb_ptp_info = { 286 .owner = THIS_MODULE, 287 .name = "ravb clock", 288 .max_adj = 50000000, 289 .n_ext_ts = N_EXT_TS, 290 .n_per_out = N_PER_OUT, 291 .adjfine = ravb_ptp_adjfine, 292 .adjtime = ravb_ptp_adjtime, 293 .gettime64 = ravb_ptp_gettime64, 294 .settime64 = ravb_ptp_settime64, 295 .enable = ravb_ptp_enable, 296}; 297 298/* Caller must hold the lock */ 299void ravb_ptp_interrupt(struct net_device *ndev) 300{ 301 struct ravb_private *priv = netdev_priv(ndev); 302 u32 gis = ravb_read(ndev, GIS); 303 304 gis &= ravb_read(ndev, GIC); 305 if (gis & GIS_PTCF) { 306 struct ptp_clock_event event; 307 308 event.type = PTP_CLOCK_EXTTS; 309 event.index = 0; 310 event.timestamp = ravb_read(ndev, GCPT); 311 ptp_clock_event(priv->ptp.clock, &event); 312 } 313 if (gis & GIS_PTMF) { 314 struct ravb_ptp_perout *perout = priv->ptp.perout; 315 316 if (perout->period) { 317 perout->target += perout->period; 318 ravb_ptp_update_compare(priv, perout->target); 319 } 320 } 321 322 ravb_write(ndev, ~(gis | GIS_RESERVED), GIS); 323} 324 325void ravb_ptp_init(struct net_device *ndev, struct platform_device *pdev) 326{ 327 struct ravb_private *priv = netdev_priv(ndev); 328 unsigned long flags; 329 330 priv->ptp.info = ravb_ptp_info; 331 332 priv->ptp.default_addend = ravb_read(ndev, GTI); 333 priv->ptp.current_addend = priv->ptp.default_addend; 334 335 spin_lock_irqsave(&priv->lock, flags); 336 ravb_wait(ndev, GCCR, GCCR_TCR, GCCR_TCR_NOREQ); 337 ravb_modify(ndev, GCCR, GCCR_TCSS, GCCR_TCSS_ADJGPTP); 338 spin_unlock_irqrestore(&priv->lock, flags); 339 340 priv->ptp.clock = ptp_clock_register(&priv->ptp.info, &pdev->dev); 341} 342 343void ravb_ptp_stop(struct net_device *ndev) 344{ 345 struct ravb_private *priv = netdev_priv(ndev); 346 347 ravb_write(ndev, 0, GIC); 348 ravb_write(ndev, 0, GIS); 349 350 ptp_clock_unregister(priv->ptp.clock); 351} 352