1 /* 2 * AT86RF230/RF231 driver 3 * 4 * Copyright (C) 2009-2012 Siemens AG 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 8 * as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * Written by: 16 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> 17 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com> 18 * Alexander Aring <aar@pengutronix.de> 19 */ 20 #include <linux/kernel.h> 21 #include <linux/module.h> 22 #include <linux/hrtimer.h> 23 #include <linux/jiffies.h> 24 #include <linux/interrupt.h> 25 #include <linux/irq.h> 26 #include <linux/gpio.h> 27 #include <linux/delay.h> 28 #include <linux/spi/spi.h> 29 #include <linux/spi/at86rf230.h> 30 #include <linux/regmap.h> 31 #include <linux/skbuff.h> 32 #include <linux/of_gpio.h> 33 #include <linux/ieee802154.h> 34 #include <linux/debugfs.h> 35 36 #include <net/mac802154.h> 37 #include <net/cfg802154.h> 38 39 #include "at86rf230.h" 40 41 struct at86rf230_local; 42 /* at86rf2xx chip depend data. 43 * All timings are in us. 44 */ 45 struct at86rf2xx_chip_data { 46 u16 t_sleep_cycle; 47 u16 t_channel_switch; 48 u16 t_reset_to_off; 49 u16 t_off_to_aack; 50 u16 t_off_to_tx_on; 51 u16 t_off_to_sleep; 52 u16 t_sleep_to_off; 53 u16 t_frame; 54 u16 t_p_ack; 55 int rssi_base_val; 56 57 int (*set_channel)(struct at86rf230_local *, u8, u8); 58 int (*set_txpower)(struct at86rf230_local *, s32); 59 }; 60 61 #define AT86RF2XX_MAX_BUF (127 + 3) 62 /* tx retries to access the TX_ON state 63 * if it's above then force change will be started. 64 * 65 * We assume the max_frame_retries (7) value of 802.15.4 here. 66 */ 67 #define AT86RF2XX_MAX_TX_RETRIES 7 68 /* We use the recommended 5 minutes timeout to recalibrate */ 69 #define AT86RF2XX_CAL_LOOP_TIMEOUT (5 * 60 * HZ) 70 71 struct at86rf230_state_change { 72 struct at86rf230_local *lp; 73 int irq; 74 75 struct hrtimer timer; 76 struct spi_message msg; 77 struct spi_transfer trx; 78 u8 buf[AT86RF2XX_MAX_BUF]; 79 80 void (*complete)(void *context); 81 u8 from_state; 82 u8 to_state; 83 84 bool free; 85 }; 86 87 struct at86rf230_trac { 88 u64 success; 89 u64 success_data_pending; 90 u64 success_wait_for_ack; 91 u64 channel_access_failure; 92 u64 no_ack; 93 u64 invalid; 94 }; 95 96 struct at86rf230_local { 97 struct spi_device *spi; 98 99 struct ieee802154_hw *hw; 100 struct at86rf2xx_chip_data *data; 101 struct regmap *regmap; 102 int slp_tr; 103 bool sleep; 104 105 struct completion state_complete; 106 struct at86rf230_state_change state; 107 108 unsigned long cal_timeout; 109 bool is_tx; 110 bool is_tx_from_off; 111 u8 tx_retry; 112 struct sk_buff *tx_skb; 113 struct at86rf230_state_change tx; 114 115 struct at86rf230_trac trac; 116 }; 117 118 #define AT86RF2XX_NUMREGS 0x3F 119 120 static void 121 at86rf230_async_state_change(struct at86rf230_local *lp, 122 struct at86rf230_state_change *ctx, 123 const u8 state, void (*complete)(void *context)); 124 125 static inline void 126 at86rf230_sleep(struct at86rf230_local *lp) 127 { 128 if (gpio_is_valid(lp->slp_tr)) { 129 gpio_set_value(lp->slp_tr, 1); 130 usleep_range(lp->data->t_off_to_sleep, 131 lp->data->t_off_to_sleep + 10); 132 lp->sleep = true; 133 } 134 } 135 136 static inline void 137 at86rf230_awake(struct at86rf230_local *lp) 138 { 139 if (gpio_is_valid(lp->slp_tr)) { 140 gpio_set_value(lp->slp_tr, 0); 141 usleep_range(lp->data->t_sleep_to_off, 142 lp->data->t_sleep_to_off + 100); 143 lp->sleep = false; 144 } 145 } 146 147 static inline int 148 __at86rf230_write(struct at86rf230_local *lp, 149 unsigned int addr, unsigned int data) 150 { 151 bool sleep = lp->sleep; 152 int ret; 153 154 /* awake for register setting if sleep */ 155 if (sleep) 156 at86rf230_awake(lp); 157 158 ret = regmap_write(lp->regmap, addr, data); 159 160 /* sleep again if was sleeping */ 161 if (sleep) 162 at86rf230_sleep(lp); 163 164 return ret; 165 } 166 167 static inline int 168 __at86rf230_read(struct at86rf230_local *lp, 169 unsigned int addr, unsigned int *data) 170 { 171 bool sleep = lp->sleep; 172 int ret; 173 174 /* awake for register setting if sleep */ 175 if (sleep) 176 at86rf230_awake(lp); 177 178 ret = regmap_read(lp->regmap, addr, data); 179 180 /* sleep again if was sleeping */ 181 if (sleep) 182 at86rf230_sleep(lp); 183 184 return ret; 185 } 186 187 static inline int 188 at86rf230_read_subreg(struct at86rf230_local *lp, 189 unsigned int addr, unsigned int mask, 190 unsigned int shift, unsigned int *data) 191 { 192 int rc; 193 194 rc = __at86rf230_read(lp, addr, data); 195 if (!rc) 196 *data = (*data & mask) >> shift; 197 198 return rc; 199 } 200 201 static inline int 202 at86rf230_write_subreg(struct at86rf230_local *lp, 203 unsigned int addr, unsigned int mask, 204 unsigned int shift, unsigned int data) 205 { 206 bool sleep = lp->sleep; 207 int ret; 208 209 /* awake for register setting if sleep */ 210 if (sleep) 211 at86rf230_awake(lp); 212 213 ret = regmap_update_bits(lp->regmap, addr, mask, data << shift); 214 215 /* sleep again if was sleeping */ 216 if (sleep) 217 at86rf230_sleep(lp); 218 219 return ret; 220 } 221 222 static inline void 223 at86rf230_slp_tr_rising_edge(struct at86rf230_local *lp) 224 { 225 gpio_set_value(lp->slp_tr, 1); 226 udelay(1); 227 gpio_set_value(lp->slp_tr, 0); 228 } 229 230 static bool 231 at86rf230_reg_writeable(struct device *dev, unsigned int reg) 232 { 233 switch (reg) { 234 case RG_TRX_STATE: 235 case RG_TRX_CTRL_0: 236 case RG_TRX_CTRL_1: 237 case RG_PHY_TX_PWR: 238 case RG_PHY_ED_LEVEL: 239 case RG_PHY_CC_CCA: 240 case RG_CCA_THRES: 241 case RG_RX_CTRL: 242 case RG_SFD_VALUE: 243 case RG_TRX_CTRL_2: 244 case RG_ANT_DIV: 245 case RG_IRQ_MASK: 246 case RG_VREG_CTRL: 247 case RG_BATMON: 248 case RG_XOSC_CTRL: 249 case RG_RX_SYN: 250 case RG_XAH_CTRL_1: 251 case RG_FTN_CTRL: 252 case RG_PLL_CF: 253 case RG_PLL_DCU: 254 case RG_SHORT_ADDR_0: 255 case RG_SHORT_ADDR_1: 256 case RG_PAN_ID_0: 257 case RG_PAN_ID_1: 258 case RG_IEEE_ADDR_0: 259 case RG_IEEE_ADDR_1: 260 case RG_IEEE_ADDR_2: 261 case RG_IEEE_ADDR_3: 262 case RG_IEEE_ADDR_4: 263 case RG_IEEE_ADDR_5: 264 case RG_IEEE_ADDR_6: 265 case RG_IEEE_ADDR_7: 266 case RG_XAH_CTRL_0: 267 case RG_CSMA_SEED_0: 268 case RG_CSMA_SEED_1: 269 case RG_CSMA_BE: 270 return true; 271 default: 272 return false; 273 } 274 } 275 276 static bool 277 at86rf230_reg_readable(struct device *dev, unsigned int reg) 278 { 279 bool rc; 280 281 /* all writeable are also readable */ 282 rc = at86rf230_reg_writeable(dev, reg); 283 if (rc) 284 return rc; 285 286 /* readonly regs */ 287 switch (reg) { 288 case RG_TRX_STATUS: 289 case RG_PHY_RSSI: 290 case RG_IRQ_STATUS: 291 case RG_PART_NUM: 292 case RG_VERSION_NUM: 293 case RG_MAN_ID_1: 294 case RG_MAN_ID_0: 295 return true; 296 default: 297 return false; 298 } 299 } 300 301 static bool 302 at86rf230_reg_volatile(struct device *dev, unsigned int reg) 303 { 304 /* can be changed during runtime */ 305 switch (reg) { 306 case RG_TRX_STATUS: 307 case RG_TRX_STATE: 308 case RG_PHY_RSSI: 309 case RG_PHY_ED_LEVEL: 310 case RG_IRQ_STATUS: 311 case RG_VREG_CTRL: 312 case RG_PLL_CF: 313 case RG_PLL_DCU: 314 return true; 315 default: 316 return false; 317 } 318 } 319 320 static bool 321 at86rf230_reg_precious(struct device *dev, unsigned int reg) 322 { 323 /* don't clear irq line on read */ 324 switch (reg) { 325 case RG_IRQ_STATUS: 326 return true; 327 default: 328 return false; 329 } 330 } 331 332 static const struct regmap_config at86rf230_regmap_spi_config = { 333 .reg_bits = 8, 334 .val_bits = 8, 335 .write_flag_mask = CMD_REG | CMD_WRITE, 336 .read_flag_mask = CMD_REG, 337 .cache_type = REGCACHE_RBTREE, 338 .max_register = AT86RF2XX_NUMREGS, 339 .writeable_reg = at86rf230_reg_writeable, 340 .readable_reg = at86rf230_reg_readable, 341 .volatile_reg = at86rf230_reg_volatile, 342 .precious_reg = at86rf230_reg_precious, 343 }; 344 345 static void 346 at86rf230_async_error_recover_complete(void *context) 347 { 348 struct at86rf230_state_change *ctx = context; 349 struct at86rf230_local *lp = ctx->lp; 350 351 if (ctx->free) 352 kfree(ctx); 353 354 ieee802154_wake_queue(lp->hw); 355 } 356 357 static void 358 at86rf230_async_error_recover(void *context) 359 { 360 struct at86rf230_state_change *ctx = context; 361 struct at86rf230_local *lp = ctx->lp; 362 363 lp->is_tx = 0; 364 at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON, 365 at86rf230_async_error_recover_complete); 366 } 367 368 static inline void 369 at86rf230_async_error(struct at86rf230_local *lp, 370 struct at86rf230_state_change *ctx, int rc) 371 { 372 dev_err(&lp->spi->dev, "spi_async error %d\n", rc); 373 374 at86rf230_async_state_change(lp, ctx, STATE_FORCE_TRX_OFF, 375 at86rf230_async_error_recover); 376 } 377 378 /* Generic function to get some register value in async mode */ 379 static void 380 at86rf230_async_read_reg(struct at86rf230_local *lp, u8 reg, 381 struct at86rf230_state_change *ctx, 382 void (*complete)(void *context)) 383 { 384 int rc; 385 386 u8 *tx_buf = ctx->buf; 387 388 tx_buf[0] = (reg & CMD_REG_MASK) | CMD_REG; 389 ctx->msg.complete = complete; 390 rc = spi_async(lp->spi, &ctx->msg); 391 if (rc) 392 at86rf230_async_error(lp, ctx, rc); 393 } 394 395 static void 396 at86rf230_async_write_reg(struct at86rf230_local *lp, u8 reg, u8 val, 397 struct at86rf230_state_change *ctx, 398 void (*complete)(void *context)) 399 { 400 int rc; 401 402 ctx->buf[0] = (reg & CMD_REG_MASK) | CMD_REG | CMD_WRITE; 403 ctx->buf[1] = val; 404 ctx->msg.complete = complete; 405 rc = spi_async(lp->spi, &ctx->msg); 406 if (rc) 407 at86rf230_async_error(lp, ctx, rc); 408 } 409 410 static void 411 at86rf230_async_state_assert(void *context) 412 { 413 struct at86rf230_state_change *ctx = context; 414 struct at86rf230_local *lp = ctx->lp; 415 const u8 *buf = ctx->buf; 416 const u8 trx_state = buf[1] & TRX_STATE_MASK; 417 418 /* Assert state change */ 419 if (trx_state != ctx->to_state) { 420 /* Special handling if transceiver state is in 421 * STATE_BUSY_RX_AACK and a SHR was detected. 422 */ 423 if (trx_state == STATE_BUSY_RX_AACK) { 424 /* Undocumented race condition. If we send a state 425 * change to STATE_RX_AACK_ON the transceiver could 426 * change his state automatically to STATE_BUSY_RX_AACK 427 * if a SHR was detected. This is not an error, but we 428 * can't assert this. 429 */ 430 if (ctx->to_state == STATE_RX_AACK_ON) 431 goto done; 432 433 /* If we change to STATE_TX_ON without forcing and 434 * transceiver state is STATE_BUSY_RX_AACK, we wait 435 * 'tFrame + tPAck' receiving time. In this time the 436 * PDU should be received. If the transceiver is still 437 * in STATE_BUSY_RX_AACK, we run a force state change 438 * to STATE_TX_ON. This is a timeout handling, if the 439 * transceiver stucks in STATE_BUSY_RX_AACK. 440 * 441 * Additional we do several retries to try to get into 442 * TX_ON state without forcing. If the retries are 443 * higher or equal than AT86RF2XX_MAX_TX_RETRIES we 444 * will do a force change. 445 */ 446 if (ctx->to_state == STATE_TX_ON || 447 ctx->to_state == STATE_TRX_OFF) { 448 u8 state = ctx->to_state; 449 450 if (lp->tx_retry >= AT86RF2XX_MAX_TX_RETRIES) 451 state = STATE_FORCE_TRX_OFF; 452 lp->tx_retry++; 453 454 at86rf230_async_state_change(lp, ctx, state, 455 ctx->complete); 456 return; 457 } 458 } 459 460 dev_warn(&lp->spi->dev, "unexcept state change from 0x%02x to 0x%02x. Actual state: 0x%02x\n", 461 ctx->from_state, ctx->to_state, trx_state); 462 } 463 464 done: 465 if (ctx->complete) 466 ctx->complete(context); 467 } 468 469 static enum hrtimer_restart at86rf230_async_state_timer(struct hrtimer *timer) 470 { 471 struct at86rf230_state_change *ctx = 472 container_of(timer, struct at86rf230_state_change, timer); 473 struct at86rf230_local *lp = ctx->lp; 474 475 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx, 476 at86rf230_async_state_assert); 477 478 return HRTIMER_NORESTART; 479 } 480 481 /* Do state change timing delay. */ 482 static void 483 at86rf230_async_state_delay(void *context) 484 { 485 struct at86rf230_state_change *ctx = context; 486 struct at86rf230_local *lp = ctx->lp; 487 struct at86rf2xx_chip_data *c = lp->data; 488 bool force = false; 489 ktime_t tim; 490 491 /* The force state changes are will show as normal states in the 492 * state status subregister. We change the to_state to the 493 * corresponding one and remember if it was a force change, this 494 * differs if we do a state change from STATE_BUSY_RX_AACK. 495 */ 496 switch (ctx->to_state) { 497 case STATE_FORCE_TX_ON: 498 ctx->to_state = STATE_TX_ON; 499 force = true; 500 break; 501 case STATE_FORCE_TRX_OFF: 502 ctx->to_state = STATE_TRX_OFF; 503 force = true; 504 break; 505 default: 506 break; 507 } 508 509 switch (ctx->from_state) { 510 case STATE_TRX_OFF: 511 switch (ctx->to_state) { 512 case STATE_RX_AACK_ON: 513 tim = c->t_off_to_aack * NSEC_PER_USEC; 514 /* state change from TRX_OFF to RX_AACK_ON to do a 515 * calibration, we need to reset the timeout for the 516 * next one. 517 */ 518 lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT; 519 goto change; 520 case STATE_TX_ARET_ON: 521 case STATE_TX_ON: 522 tim = c->t_off_to_tx_on * NSEC_PER_USEC; 523 /* state change from TRX_OFF to TX_ON or ARET_ON to do 524 * a calibration, we need to reset the timeout for the 525 * next one. 526 */ 527 lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT; 528 goto change; 529 default: 530 break; 531 } 532 break; 533 case STATE_BUSY_RX_AACK: 534 switch (ctx->to_state) { 535 case STATE_TRX_OFF: 536 case STATE_TX_ON: 537 /* Wait for worst case receiving time if we 538 * didn't make a force change from BUSY_RX_AACK 539 * to TX_ON or TRX_OFF. 540 */ 541 if (!force) { 542 tim = (c->t_frame + c->t_p_ack) * NSEC_PER_USEC; 543 goto change; 544 } 545 break; 546 default: 547 break; 548 } 549 break; 550 /* Default value, means RESET state */ 551 case STATE_P_ON: 552 switch (ctx->to_state) { 553 case STATE_TRX_OFF: 554 tim = c->t_reset_to_off * NSEC_PER_USEC; 555 goto change; 556 default: 557 break; 558 } 559 break; 560 default: 561 break; 562 } 563 564 /* Default delay is 1us in the most cases */ 565 udelay(1); 566 at86rf230_async_state_timer(&ctx->timer); 567 return; 568 569 change: 570 hrtimer_start(&ctx->timer, tim, HRTIMER_MODE_REL); 571 } 572 573 static void 574 at86rf230_async_state_change_start(void *context) 575 { 576 struct at86rf230_state_change *ctx = context; 577 struct at86rf230_local *lp = ctx->lp; 578 u8 *buf = ctx->buf; 579 const u8 trx_state = buf[1] & TRX_STATE_MASK; 580 581 /* Check for "possible" STATE_TRANSITION_IN_PROGRESS */ 582 if (trx_state == STATE_TRANSITION_IN_PROGRESS) { 583 udelay(1); 584 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx, 585 at86rf230_async_state_change_start); 586 return; 587 } 588 589 /* Check if we already are in the state which we change in */ 590 if (trx_state == ctx->to_state) { 591 if (ctx->complete) 592 ctx->complete(context); 593 return; 594 } 595 596 /* Set current state to the context of state change */ 597 ctx->from_state = trx_state; 598 599 /* Going into the next step for a state change which do a timing 600 * relevant delay. 601 */ 602 at86rf230_async_write_reg(lp, RG_TRX_STATE, ctx->to_state, ctx, 603 at86rf230_async_state_delay); 604 } 605 606 static void 607 at86rf230_async_state_change(struct at86rf230_local *lp, 608 struct at86rf230_state_change *ctx, 609 const u8 state, void (*complete)(void *context)) 610 { 611 /* Initialization for the state change context */ 612 ctx->to_state = state; 613 ctx->complete = complete; 614 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx, 615 at86rf230_async_state_change_start); 616 } 617 618 static void 619 at86rf230_sync_state_change_complete(void *context) 620 { 621 struct at86rf230_state_change *ctx = context; 622 struct at86rf230_local *lp = ctx->lp; 623 624 complete(&lp->state_complete); 625 } 626 627 /* This function do a sync framework above the async state change. 628 * Some callbacks of the IEEE 802.15.4 driver interface need to be 629 * handled synchronously. 630 */ 631 static int 632 at86rf230_sync_state_change(struct at86rf230_local *lp, unsigned int state) 633 { 634 unsigned long rc; 635 636 at86rf230_async_state_change(lp, &lp->state, state, 637 at86rf230_sync_state_change_complete); 638 639 rc = wait_for_completion_timeout(&lp->state_complete, 640 msecs_to_jiffies(100)); 641 if (!rc) { 642 at86rf230_async_error(lp, &lp->state, -ETIMEDOUT); 643 return -ETIMEDOUT; 644 } 645 646 return 0; 647 } 648 649 static void 650 at86rf230_tx_complete(void *context) 651 { 652 struct at86rf230_state_change *ctx = context; 653 struct at86rf230_local *lp = ctx->lp; 654 655 ieee802154_xmit_complete(lp->hw, lp->tx_skb, false); 656 kfree(ctx); 657 } 658 659 static void 660 at86rf230_tx_on(void *context) 661 { 662 struct at86rf230_state_change *ctx = context; 663 struct at86rf230_local *lp = ctx->lp; 664 665 at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON, 666 at86rf230_tx_complete); 667 } 668 669 static void 670 at86rf230_tx_trac_check(void *context) 671 { 672 struct at86rf230_state_change *ctx = context; 673 struct at86rf230_local *lp = ctx->lp; 674 675 if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS)) { 676 u8 trac = TRAC_MASK(ctx->buf[1]); 677 678 switch (trac) { 679 case TRAC_SUCCESS: 680 lp->trac.success++; 681 break; 682 case TRAC_SUCCESS_DATA_PENDING: 683 lp->trac.success_data_pending++; 684 break; 685 case TRAC_CHANNEL_ACCESS_FAILURE: 686 lp->trac.channel_access_failure++; 687 break; 688 case TRAC_NO_ACK: 689 lp->trac.no_ack++; 690 break; 691 case TRAC_INVALID: 692 lp->trac.invalid++; 693 break; 694 default: 695 WARN_ONCE(1, "received tx trac status %d\n", trac); 696 break; 697 } 698 } 699 700 at86rf230_async_state_change(lp, ctx, STATE_TX_ON, at86rf230_tx_on); 701 } 702 703 static void 704 at86rf230_rx_read_frame_complete(void *context) 705 { 706 struct at86rf230_state_change *ctx = context; 707 struct at86rf230_local *lp = ctx->lp; 708 const u8 *buf = ctx->buf; 709 struct sk_buff *skb; 710 u8 len, lqi; 711 712 len = buf[1]; 713 if (!ieee802154_is_valid_psdu_len(len)) { 714 dev_vdbg(&lp->spi->dev, "corrupted frame received\n"); 715 len = IEEE802154_MTU; 716 } 717 lqi = buf[2 + len]; 718 719 skb = dev_alloc_skb(IEEE802154_MTU); 720 if (!skb) { 721 dev_vdbg(&lp->spi->dev, "failed to allocate sk_buff\n"); 722 kfree(ctx); 723 return; 724 } 725 726 skb_put_data(skb, buf + 2, len); 727 ieee802154_rx_irqsafe(lp->hw, skb, lqi); 728 kfree(ctx); 729 } 730 731 static void 732 at86rf230_rx_trac_check(void *context) 733 { 734 struct at86rf230_state_change *ctx = context; 735 struct at86rf230_local *lp = ctx->lp; 736 u8 *buf = ctx->buf; 737 int rc; 738 739 if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS)) { 740 u8 trac = TRAC_MASK(buf[1]); 741 742 switch (trac) { 743 case TRAC_SUCCESS: 744 lp->trac.success++; 745 break; 746 case TRAC_SUCCESS_WAIT_FOR_ACK: 747 lp->trac.success_wait_for_ack++; 748 break; 749 case TRAC_INVALID: 750 lp->trac.invalid++; 751 break; 752 default: 753 WARN_ONCE(1, "received rx trac status %d\n", trac); 754 break; 755 } 756 } 757 758 buf[0] = CMD_FB; 759 ctx->trx.len = AT86RF2XX_MAX_BUF; 760 ctx->msg.complete = at86rf230_rx_read_frame_complete; 761 rc = spi_async(lp->spi, &ctx->msg); 762 if (rc) { 763 ctx->trx.len = 2; 764 at86rf230_async_error(lp, ctx, rc); 765 } 766 } 767 768 static void 769 at86rf230_irq_trx_end(void *context) 770 { 771 struct at86rf230_state_change *ctx = context; 772 struct at86rf230_local *lp = ctx->lp; 773 774 if (lp->is_tx) { 775 lp->is_tx = 0; 776 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx, 777 at86rf230_tx_trac_check); 778 } else { 779 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx, 780 at86rf230_rx_trac_check); 781 } 782 } 783 784 static void 785 at86rf230_irq_status(void *context) 786 { 787 struct at86rf230_state_change *ctx = context; 788 struct at86rf230_local *lp = ctx->lp; 789 const u8 *buf = ctx->buf; 790 u8 irq = buf[1]; 791 792 enable_irq(lp->spi->irq); 793 794 if (irq & IRQ_TRX_END) { 795 at86rf230_irq_trx_end(ctx); 796 } else { 797 dev_err(&lp->spi->dev, "not supported irq %02x received\n", 798 irq); 799 kfree(ctx); 800 } 801 } 802 803 static void 804 at86rf230_setup_spi_messages(struct at86rf230_local *lp, 805 struct at86rf230_state_change *state) 806 { 807 state->lp = lp; 808 state->irq = lp->spi->irq; 809 spi_message_init(&state->msg); 810 state->msg.context = state; 811 state->trx.len = 2; 812 state->trx.tx_buf = state->buf; 813 state->trx.rx_buf = state->buf; 814 spi_message_add_tail(&state->trx, &state->msg); 815 hrtimer_init(&state->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 816 state->timer.function = at86rf230_async_state_timer; 817 } 818 819 static irqreturn_t at86rf230_isr(int irq, void *data) 820 { 821 struct at86rf230_local *lp = data; 822 struct at86rf230_state_change *ctx; 823 int rc; 824 825 disable_irq_nosync(irq); 826 827 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC); 828 if (!ctx) { 829 enable_irq(irq); 830 return IRQ_NONE; 831 } 832 833 at86rf230_setup_spi_messages(lp, ctx); 834 /* tell on error handling to free ctx */ 835 ctx->free = true; 836 837 ctx->buf[0] = (RG_IRQ_STATUS & CMD_REG_MASK) | CMD_REG; 838 ctx->msg.complete = at86rf230_irq_status; 839 rc = spi_async(lp->spi, &ctx->msg); 840 if (rc) { 841 at86rf230_async_error(lp, ctx, rc); 842 enable_irq(irq); 843 return IRQ_NONE; 844 } 845 846 return IRQ_HANDLED; 847 } 848 849 static void 850 at86rf230_write_frame_complete(void *context) 851 { 852 struct at86rf230_state_change *ctx = context; 853 struct at86rf230_local *lp = ctx->lp; 854 855 ctx->trx.len = 2; 856 857 if (gpio_is_valid(lp->slp_tr)) 858 at86rf230_slp_tr_rising_edge(lp); 859 else 860 at86rf230_async_write_reg(lp, RG_TRX_STATE, STATE_BUSY_TX, ctx, 861 NULL); 862 } 863 864 static void 865 at86rf230_write_frame(void *context) 866 { 867 struct at86rf230_state_change *ctx = context; 868 struct at86rf230_local *lp = ctx->lp; 869 struct sk_buff *skb = lp->tx_skb; 870 u8 *buf = ctx->buf; 871 int rc; 872 873 lp->is_tx = 1; 874 875 buf[0] = CMD_FB | CMD_WRITE; 876 buf[1] = skb->len + 2; 877 memcpy(buf + 2, skb->data, skb->len); 878 ctx->trx.len = skb->len + 2; 879 ctx->msg.complete = at86rf230_write_frame_complete; 880 rc = spi_async(lp->spi, &ctx->msg); 881 if (rc) { 882 ctx->trx.len = 2; 883 at86rf230_async_error(lp, ctx, rc); 884 } 885 } 886 887 static void 888 at86rf230_xmit_tx_on(void *context) 889 { 890 struct at86rf230_state_change *ctx = context; 891 struct at86rf230_local *lp = ctx->lp; 892 893 at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON, 894 at86rf230_write_frame); 895 } 896 897 static void 898 at86rf230_xmit_start(void *context) 899 { 900 struct at86rf230_state_change *ctx = context; 901 struct at86rf230_local *lp = ctx->lp; 902 903 /* check if we change from off state */ 904 if (lp->is_tx_from_off) 905 at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON, 906 at86rf230_write_frame); 907 else 908 at86rf230_async_state_change(lp, ctx, STATE_TX_ON, 909 at86rf230_xmit_tx_on); 910 } 911 912 static int 913 at86rf230_xmit(struct ieee802154_hw *hw, struct sk_buff *skb) 914 { 915 struct at86rf230_local *lp = hw->priv; 916 struct at86rf230_state_change *ctx = &lp->tx; 917 918 lp->tx_skb = skb; 919 lp->tx_retry = 0; 920 921 /* After 5 minutes in PLL and the same frequency we run again the 922 * calibration loops which is recommended by at86rf2xx datasheets. 923 * 924 * The calibration is initiate by a state change from TRX_OFF 925 * to TX_ON, the lp->cal_timeout should be reinit by state_delay 926 * function then to start in the next 5 minutes. 927 */ 928 if (time_is_before_jiffies(lp->cal_timeout)) { 929 lp->is_tx_from_off = true; 930 at86rf230_async_state_change(lp, ctx, STATE_TRX_OFF, 931 at86rf230_xmit_start); 932 } else { 933 lp->is_tx_from_off = false; 934 at86rf230_xmit_start(ctx); 935 } 936 937 return 0; 938 } 939 940 static int 941 at86rf230_ed(struct ieee802154_hw *hw, u8 *level) 942 { 943 BUG_ON(!level); 944 *level = 0xbe; 945 return 0; 946 } 947 948 static int 949 at86rf230_start(struct ieee802154_hw *hw) 950 { 951 struct at86rf230_local *lp = hw->priv; 952 953 /* reset trac stats on start */ 954 if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS)) 955 memset(&lp->trac, 0, sizeof(struct at86rf230_trac)); 956 957 at86rf230_awake(lp); 958 enable_irq(lp->spi->irq); 959 960 return at86rf230_sync_state_change(lp, STATE_RX_AACK_ON); 961 } 962 963 static void 964 at86rf230_stop(struct ieee802154_hw *hw) 965 { 966 struct at86rf230_local *lp = hw->priv; 967 u8 csma_seed[2]; 968 969 at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF); 970 971 disable_irq(lp->spi->irq); 972 973 /* It's recommended to set random new csma_seeds before sleep state. 974 * Makes only sense in the stop callback, not doing this inside of 975 * at86rf230_sleep, this is also used when we don't transmit afterwards 976 * when calling start callback again. 977 */ 978 get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed)); 979 at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]); 980 at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]); 981 982 at86rf230_sleep(lp); 983 } 984 985 static int 986 at86rf23x_set_channel(struct at86rf230_local *lp, u8 page, u8 channel) 987 { 988 return at86rf230_write_subreg(lp, SR_CHANNEL, channel); 989 } 990 991 #define AT86RF2XX_MAX_ED_LEVELS 0xF 992 static const s32 at86rf233_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = { 993 -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000, -7800, -7600, 994 -7400, -7200, -7000, -6800, -6600, -6400, 995 }; 996 997 static const s32 at86rf231_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = { 998 -9100, -8900, -8700, -8500, -8300, -8100, -7900, -7700, -7500, -7300, 999 -7100, -6900, -6700, -6500, -6300, -6100, 1000 }; 1001 1002 static const s32 at86rf212_ed_levels_100[AT86RF2XX_MAX_ED_LEVELS + 1] = { 1003 -10000, -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200, 1004 -8000, -7800, -7600, -7400, -7200, -7000, 1005 }; 1006 1007 static const s32 at86rf212_ed_levels_98[AT86RF2XX_MAX_ED_LEVELS + 1] = { 1008 -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000, 1009 -7800, -7600, -7400, -7200, -7000, -6800, 1010 }; 1011 1012 static inline int 1013 at86rf212_update_cca_ed_level(struct at86rf230_local *lp, int rssi_base_val) 1014 { 1015 unsigned int cca_ed_thres; 1016 int rc; 1017 1018 rc = at86rf230_read_subreg(lp, SR_CCA_ED_THRES, &cca_ed_thres); 1019 if (rc < 0) 1020 return rc; 1021 1022 switch (rssi_base_val) { 1023 case -98: 1024 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_98; 1025 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_98); 1026 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_98[cca_ed_thres]; 1027 break; 1028 case -100: 1029 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100; 1030 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100); 1031 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_100[cca_ed_thres]; 1032 break; 1033 default: 1034 WARN_ON(1); 1035 } 1036 1037 return 0; 1038 } 1039 1040 static int 1041 at86rf212_set_channel(struct at86rf230_local *lp, u8 page, u8 channel) 1042 { 1043 int rc; 1044 1045 if (channel == 0) 1046 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 0); 1047 else 1048 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 1); 1049 if (rc < 0) 1050 return rc; 1051 1052 if (page == 0) { 1053 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 0); 1054 lp->data->rssi_base_val = -100; 1055 } else { 1056 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 1); 1057 lp->data->rssi_base_val = -98; 1058 } 1059 if (rc < 0) 1060 return rc; 1061 1062 rc = at86rf212_update_cca_ed_level(lp, lp->data->rssi_base_val); 1063 if (rc < 0) 1064 return rc; 1065 1066 /* This sets the symbol_duration according frequency on the 212. 1067 * TODO move this handling while set channel and page in cfg802154. 1068 * We can do that, this timings are according 802.15.4 standard. 1069 * If we do that in cfg802154, this is a more generic calculation. 1070 * 1071 * This should also protected from ifs_timer. Means cancel timer and 1072 * init with a new value. For now, this is okay. 1073 */ 1074 if (channel == 0) { 1075 if (page == 0) { 1076 /* SUB:0 and BPSK:0 -> BPSK-20 */ 1077 lp->hw->phy->symbol_duration = 50; 1078 } else { 1079 /* SUB:1 and BPSK:0 -> BPSK-40 */ 1080 lp->hw->phy->symbol_duration = 25; 1081 } 1082 } else { 1083 if (page == 0) 1084 /* SUB:0 and BPSK:1 -> OQPSK-100/200/400 */ 1085 lp->hw->phy->symbol_duration = 40; 1086 else 1087 /* SUB:1 and BPSK:1 -> OQPSK-250/500/1000 */ 1088 lp->hw->phy->symbol_duration = 16; 1089 } 1090 1091 lp->hw->phy->lifs_period = IEEE802154_LIFS_PERIOD * 1092 lp->hw->phy->symbol_duration; 1093 lp->hw->phy->sifs_period = IEEE802154_SIFS_PERIOD * 1094 lp->hw->phy->symbol_duration; 1095 1096 return at86rf230_write_subreg(lp, SR_CHANNEL, channel); 1097 } 1098 1099 static int 1100 at86rf230_channel(struct ieee802154_hw *hw, u8 page, u8 channel) 1101 { 1102 struct at86rf230_local *lp = hw->priv; 1103 int rc; 1104 1105 rc = lp->data->set_channel(lp, page, channel); 1106 /* Wait for PLL */ 1107 usleep_range(lp->data->t_channel_switch, 1108 lp->data->t_channel_switch + 10); 1109 1110 lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT; 1111 return rc; 1112 } 1113 1114 static int 1115 at86rf230_set_hw_addr_filt(struct ieee802154_hw *hw, 1116 struct ieee802154_hw_addr_filt *filt, 1117 unsigned long changed) 1118 { 1119 struct at86rf230_local *lp = hw->priv; 1120 1121 if (changed & IEEE802154_AFILT_SADDR_CHANGED) { 1122 u16 addr = le16_to_cpu(filt->short_addr); 1123 1124 dev_vdbg(&lp->spi->dev, 1125 "at86rf230_set_hw_addr_filt called for saddr\n"); 1126 __at86rf230_write(lp, RG_SHORT_ADDR_0, addr); 1127 __at86rf230_write(lp, RG_SHORT_ADDR_1, addr >> 8); 1128 } 1129 1130 if (changed & IEEE802154_AFILT_PANID_CHANGED) { 1131 u16 pan = le16_to_cpu(filt->pan_id); 1132 1133 dev_vdbg(&lp->spi->dev, 1134 "at86rf230_set_hw_addr_filt called for pan id\n"); 1135 __at86rf230_write(lp, RG_PAN_ID_0, pan); 1136 __at86rf230_write(lp, RG_PAN_ID_1, pan >> 8); 1137 } 1138 1139 if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) { 1140 u8 i, addr[8]; 1141 1142 memcpy(addr, &filt->ieee_addr, 8); 1143 dev_vdbg(&lp->spi->dev, 1144 "at86rf230_set_hw_addr_filt called for IEEE addr\n"); 1145 for (i = 0; i < 8; i++) 1146 __at86rf230_write(lp, RG_IEEE_ADDR_0 + i, addr[i]); 1147 } 1148 1149 if (changed & IEEE802154_AFILT_PANC_CHANGED) { 1150 dev_vdbg(&lp->spi->dev, 1151 "at86rf230_set_hw_addr_filt called for panc change\n"); 1152 if (filt->pan_coord) 1153 at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 1); 1154 else 1155 at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 0); 1156 } 1157 1158 return 0; 1159 } 1160 1161 #define AT86RF23X_MAX_TX_POWERS 0xF 1162 static const s32 at86rf233_powers[AT86RF23X_MAX_TX_POWERS + 1] = { 1163 400, 370, 340, 300, 250, 200, 100, 0, -100, -200, -300, -400, -600, 1164 -800, -1200, -1700, 1165 }; 1166 1167 static const s32 at86rf231_powers[AT86RF23X_MAX_TX_POWERS + 1] = { 1168 300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700, 1169 -900, -1200, -1700, 1170 }; 1171 1172 #define AT86RF212_MAX_TX_POWERS 0x1F 1173 static const s32 at86rf212_powers[AT86RF212_MAX_TX_POWERS + 1] = { 1174 500, 400, 300, 200, 100, 0, -100, -200, -300, -400, -500, -600, -700, 1175 -800, -900, -1000, -1100, -1200, -1300, -1400, -1500, -1600, -1700, 1176 -1800, -1900, -2000, -2100, -2200, -2300, -2400, -2500, -2600, 1177 }; 1178 1179 static int 1180 at86rf23x_set_txpower(struct at86rf230_local *lp, s32 mbm) 1181 { 1182 u32 i; 1183 1184 for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) { 1185 if (lp->hw->phy->supported.tx_powers[i] == mbm) 1186 return at86rf230_write_subreg(lp, SR_TX_PWR_23X, i); 1187 } 1188 1189 return -EINVAL; 1190 } 1191 1192 static int 1193 at86rf212_set_txpower(struct at86rf230_local *lp, s32 mbm) 1194 { 1195 u32 i; 1196 1197 for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) { 1198 if (lp->hw->phy->supported.tx_powers[i] == mbm) 1199 return at86rf230_write_subreg(lp, SR_TX_PWR_212, i); 1200 } 1201 1202 return -EINVAL; 1203 } 1204 1205 static int 1206 at86rf230_set_txpower(struct ieee802154_hw *hw, s32 mbm) 1207 { 1208 struct at86rf230_local *lp = hw->priv; 1209 1210 return lp->data->set_txpower(lp, mbm); 1211 } 1212 1213 static int 1214 at86rf230_set_lbt(struct ieee802154_hw *hw, bool on) 1215 { 1216 struct at86rf230_local *lp = hw->priv; 1217 1218 return at86rf230_write_subreg(lp, SR_CSMA_LBT_MODE, on); 1219 } 1220 1221 static int 1222 at86rf230_set_cca_mode(struct ieee802154_hw *hw, 1223 const struct wpan_phy_cca *cca) 1224 { 1225 struct at86rf230_local *lp = hw->priv; 1226 u8 val; 1227 1228 /* mapping 802.15.4 to driver spec */ 1229 switch (cca->mode) { 1230 case NL802154_CCA_ENERGY: 1231 val = 1; 1232 break; 1233 case NL802154_CCA_CARRIER: 1234 val = 2; 1235 break; 1236 case NL802154_CCA_ENERGY_CARRIER: 1237 switch (cca->opt) { 1238 case NL802154_CCA_OPT_ENERGY_CARRIER_AND: 1239 val = 3; 1240 break; 1241 case NL802154_CCA_OPT_ENERGY_CARRIER_OR: 1242 val = 0; 1243 break; 1244 default: 1245 return -EINVAL; 1246 } 1247 break; 1248 default: 1249 return -EINVAL; 1250 } 1251 1252 return at86rf230_write_subreg(lp, SR_CCA_MODE, val); 1253 } 1254 1255 1256 static int 1257 at86rf230_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm) 1258 { 1259 struct at86rf230_local *lp = hw->priv; 1260 u32 i; 1261 1262 for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) { 1263 if (hw->phy->supported.cca_ed_levels[i] == mbm) 1264 return at86rf230_write_subreg(lp, SR_CCA_ED_THRES, i); 1265 } 1266 1267 return -EINVAL; 1268 } 1269 1270 static int 1271 at86rf230_set_csma_params(struct ieee802154_hw *hw, u8 min_be, u8 max_be, 1272 u8 retries) 1273 { 1274 struct at86rf230_local *lp = hw->priv; 1275 int rc; 1276 1277 rc = at86rf230_write_subreg(lp, SR_MIN_BE, min_be); 1278 if (rc) 1279 return rc; 1280 1281 rc = at86rf230_write_subreg(lp, SR_MAX_BE, max_be); 1282 if (rc) 1283 return rc; 1284 1285 return at86rf230_write_subreg(lp, SR_MAX_CSMA_RETRIES, retries); 1286 } 1287 1288 static int 1289 at86rf230_set_frame_retries(struct ieee802154_hw *hw, s8 retries) 1290 { 1291 struct at86rf230_local *lp = hw->priv; 1292 1293 return at86rf230_write_subreg(lp, SR_MAX_FRAME_RETRIES, retries); 1294 } 1295 1296 static int 1297 at86rf230_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on) 1298 { 1299 struct at86rf230_local *lp = hw->priv; 1300 int rc; 1301 1302 if (on) { 1303 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 1); 1304 if (rc < 0) 1305 return rc; 1306 1307 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 1); 1308 if (rc < 0) 1309 return rc; 1310 } else { 1311 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 0); 1312 if (rc < 0) 1313 return rc; 1314 1315 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 0); 1316 if (rc < 0) 1317 return rc; 1318 } 1319 1320 return 0; 1321 } 1322 1323 static const struct ieee802154_ops at86rf230_ops = { 1324 .owner = THIS_MODULE, 1325 .xmit_async = at86rf230_xmit, 1326 .ed = at86rf230_ed, 1327 .set_channel = at86rf230_channel, 1328 .start = at86rf230_start, 1329 .stop = at86rf230_stop, 1330 .set_hw_addr_filt = at86rf230_set_hw_addr_filt, 1331 .set_txpower = at86rf230_set_txpower, 1332 .set_lbt = at86rf230_set_lbt, 1333 .set_cca_mode = at86rf230_set_cca_mode, 1334 .set_cca_ed_level = at86rf230_set_cca_ed_level, 1335 .set_csma_params = at86rf230_set_csma_params, 1336 .set_frame_retries = at86rf230_set_frame_retries, 1337 .set_promiscuous_mode = at86rf230_set_promiscuous_mode, 1338 }; 1339 1340 static struct at86rf2xx_chip_data at86rf233_data = { 1341 .t_sleep_cycle = 330, 1342 .t_channel_switch = 11, 1343 .t_reset_to_off = 26, 1344 .t_off_to_aack = 80, 1345 .t_off_to_tx_on = 80, 1346 .t_off_to_sleep = 35, 1347 .t_sleep_to_off = 1000, 1348 .t_frame = 4096, 1349 .t_p_ack = 545, 1350 .rssi_base_val = -94, 1351 .set_channel = at86rf23x_set_channel, 1352 .set_txpower = at86rf23x_set_txpower, 1353 }; 1354 1355 static struct at86rf2xx_chip_data at86rf231_data = { 1356 .t_sleep_cycle = 330, 1357 .t_channel_switch = 24, 1358 .t_reset_to_off = 37, 1359 .t_off_to_aack = 110, 1360 .t_off_to_tx_on = 110, 1361 .t_off_to_sleep = 35, 1362 .t_sleep_to_off = 1000, 1363 .t_frame = 4096, 1364 .t_p_ack = 545, 1365 .rssi_base_val = -91, 1366 .set_channel = at86rf23x_set_channel, 1367 .set_txpower = at86rf23x_set_txpower, 1368 }; 1369 1370 static struct at86rf2xx_chip_data at86rf212_data = { 1371 .t_sleep_cycle = 330, 1372 .t_channel_switch = 11, 1373 .t_reset_to_off = 26, 1374 .t_off_to_aack = 200, 1375 .t_off_to_tx_on = 200, 1376 .t_off_to_sleep = 35, 1377 .t_sleep_to_off = 1000, 1378 .t_frame = 4096, 1379 .t_p_ack = 545, 1380 .rssi_base_val = -100, 1381 .set_channel = at86rf212_set_channel, 1382 .set_txpower = at86rf212_set_txpower, 1383 }; 1384 1385 static int at86rf230_hw_init(struct at86rf230_local *lp, u8 xtal_trim) 1386 { 1387 int rc, irq_type, irq_pol = IRQ_ACTIVE_HIGH; 1388 unsigned int dvdd; 1389 u8 csma_seed[2]; 1390 1391 rc = at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF); 1392 if (rc) 1393 return rc; 1394 1395 irq_type = irq_get_trigger_type(lp->spi->irq); 1396 if (irq_type == IRQ_TYPE_EDGE_FALLING || 1397 irq_type == IRQ_TYPE_LEVEL_LOW) 1398 irq_pol = IRQ_ACTIVE_LOW; 1399 1400 rc = at86rf230_write_subreg(lp, SR_IRQ_POLARITY, irq_pol); 1401 if (rc) 1402 return rc; 1403 1404 rc = at86rf230_write_subreg(lp, SR_RX_SAFE_MODE, 1); 1405 if (rc) 1406 return rc; 1407 1408 rc = at86rf230_write_subreg(lp, SR_IRQ_MASK, IRQ_TRX_END); 1409 if (rc) 1410 return rc; 1411 1412 /* reset values differs in at86rf231 and at86rf233 */ 1413 rc = at86rf230_write_subreg(lp, SR_IRQ_MASK_MODE, 0); 1414 if (rc) 1415 return rc; 1416 1417 get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed)); 1418 rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]); 1419 if (rc) 1420 return rc; 1421 rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]); 1422 if (rc) 1423 return rc; 1424 1425 /* CLKM changes are applied immediately */ 1426 rc = at86rf230_write_subreg(lp, SR_CLKM_SHA_SEL, 0x00); 1427 if (rc) 1428 return rc; 1429 1430 /* Turn CLKM Off */ 1431 rc = at86rf230_write_subreg(lp, SR_CLKM_CTRL, 0x00); 1432 if (rc) 1433 return rc; 1434 /* Wait the next SLEEP cycle */ 1435 usleep_range(lp->data->t_sleep_cycle, 1436 lp->data->t_sleep_cycle + 100); 1437 1438 /* xtal_trim value is calculated by: 1439 * CL = 0.5 * (CX + CTRIM + CPAR) 1440 * 1441 * whereas: 1442 * CL = capacitor of used crystal 1443 * CX = connected capacitors at xtal pins 1444 * CPAR = in all at86rf2xx datasheets this is a constant value 3 pF, 1445 * but this is different on each board setup. You need to fine 1446 * tuning this value via CTRIM. 1447 * CTRIM = variable capacitor setting. Resolution is 0.3 pF range is 1448 * 0 pF upto 4.5 pF. 1449 * 1450 * Examples: 1451 * atben transceiver: 1452 * 1453 * CL = 8 pF 1454 * CX = 12 pF 1455 * CPAR = 3 pF (We assume the magic constant from datasheet) 1456 * CTRIM = 0.9 pF 1457 * 1458 * (12+0.9+3)/2 = 7.95 which is nearly at 8 pF 1459 * 1460 * xtal_trim = 0x3 1461 * 1462 * openlabs transceiver: 1463 * 1464 * CL = 16 pF 1465 * CX = 22 pF 1466 * CPAR = 3 pF (We assume the magic constant from datasheet) 1467 * CTRIM = 4.5 pF 1468 * 1469 * (22+4.5+3)/2 = 14.75 which is the nearest value to 16 pF 1470 * 1471 * xtal_trim = 0xf 1472 */ 1473 rc = at86rf230_write_subreg(lp, SR_XTAL_TRIM, xtal_trim); 1474 if (rc) 1475 return rc; 1476 1477 rc = at86rf230_read_subreg(lp, SR_DVDD_OK, &dvdd); 1478 if (rc) 1479 return rc; 1480 if (!dvdd) { 1481 dev_err(&lp->spi->dev, "DVDD error\n"); 1482 return -EINVAL; 1483 } 1484 1485 /* Force setting slotted operation bit to 0. Sometimes the atben 1486 * sets this bit and I don't know why. We set this always force 1487 * to zero while probing. 1488 */ 1489 return at86rf230_write_subreg(lp, SR_SLOTTED_OPERATION, 0); 1490 } 1491 1492 static int 1493 at86rf230_get_pdata(struct spi_device *spi, int *rstn, int *slp_tr, 1494 u8 *xtal_trim) 1495 { 1496 struct at86rf230_platform_data *pdata = spi->dev.platform_data; 1497 int ret; 1498 1499 if (!IS_ENABLED(CONFIG_OF) || !spi->dev.of_node) { 1500 if (!pdata) 1501 return -ENOENT; 1502 1503 *rstn = pdata->rstn; 1504 *slp_tr = pdata->slp_tr; 1505 *xtal_trim = pdata->xtal_trim; 1506 return 0; 1507 } 1508 1509 *rstn = of_get_named_gpio(spi->dev.of_node, "reset-gpio", 0); 1510 *slp_tr = of_get_named_gpio(spi->dev.of_node, "sleep-gpio", 0); 1511 ret = of_property_read_u8(spi->dev.of_node, "xtal-trim", xtal_trim); 1512 if (ret < 0 && ret != -EINVAL) 1513 return ret; 1514 1515 return 0; 1516 } 1517 1518 static int 1519 at86rf230_detect_device(struct at86rf230_local *lp) 1520 { 1521 unsigned int part, version, val; 1522 u16 man_id = 0; 1523 const char *chip; 1524 int rc; 1525 1526 rc = __at86rf230_read(lp, RG_MAN_ID_0, &val); 1527 if (rc) 1528 return rc; 1529 man_id |= val; 1530 1531 rc = __at86rf230_read(lp, RG_MAN_ID_1, &val); 1532 if (rc) 1533 return rc; 1534 man_id |= (val << 8); 1535 1536 rc = __at86rf230_read(lp, RG_PART_NUM, &part); 1537 if (rc) 1538 return rc; 1539 1540 rc = __at86rf230_read(lp, RG_VERSION_NUM, &version); 1541 if (rc) 1542 return rc; 1543 1544 if (man_id != 0x001f) { 1545 dev_err(&lp->spi->dev, "Non-Atmel dev found (MAN_ID %02x %02x)\n", 1546 man_id >> 8, man_id & 0xFF); 1547 return -EINVAL; 1548 } 1549 1550 lp->hw->flags = IEEE802154_HW_TX_OMIT_CKSUM | 1551 IEEE802154_HW_CSMA_PARAMS | 1552 IEEE802154_HW_FRAME_RETRIES | IEEE802154_HW_AFILT | 1553 IEEE802154_HW_PROMISCUOUS; 1554 1555 lp->hw->phy->flags = WPAN_PHY_FLAG_TXPOWER | 1556 WPAN_PHY_FLAG_CCA_ED_LEVEL | 1557 WPAN_PHY_FLAG_CCA_MODE; 1558 1559 lp->hw->phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY) | 1560 BIT(NL802154_CCA_CARRIER) | BIT(NL802154_CCA_ENERGY_CARRIER); 1561 lp->hw->phy->supported.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND) | 1562 BIT(NL802154_CCA_OPT_ENERGY_CARRIER_OR); 1563 1564 lp->hw->phy->cca.mode = NL802154_CCA_ENERGY; 1565 1566 switch (part) { 1567 case 2: 1568 chip = "at86rf230"; 1569 rc = -ENOTSUPP; 1570 goto not_supp; 1571 case 3: 1572 chip = "at86rf231"; 1573 lp->data = &at86rf231_data; 1574 lp->hw->phy->supported.channels[0] = 0x7FFF800; 1575 lp->hw->phy->current_channel = 11; 1576 lp->hw->phy->symbol_duration = 16; 1577 lp->hw->phy->supported.tx_powers = at86rf231_powers; 1578 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf231_powers); 1579 lp->hw->phy->supported.cca_ed_levels = at86rf231_ed_levels; 1580 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf231_ed_levels); 1581 break; 1582 case 7: 1583 chip = "at86rf212"; 1584 lp->data = &at86rf212_data; 1585 lp->hw->flags |= IEEE802154_HW_LBT; 1586 lp->hw->phy->supported.channels[0] = 0x00007FF; 1587 lp->hw->phy->supported.channels[2] = 0x00007FF; 1588 lp->hw->phy->current_channel = 5; 1589 lp->hw->phy->symbol_duration = 25; 1590 lp->hw->phy->supported.lbt = NL802154_SUPPORTED_BOOL_BOTH; 1591 lp->hw->phy->supported.tx_powers = at86rf212_powers; 1592 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf212_powers); 1593 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100; 1594 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100); 1595 break; 1596 case 11: 1597 chip = "at86rf233"; 1598 lp->data = &at86rf233_data; 1599 lp->hw->phy->supported.channels[0] = 0x7FFF800; 1600 lp->hw->phy->current_channel = 13; 1601 lp->hw->phy->symbol_duration = 16; 1602 lp->hw->phy->supported.tx_powers = at86rf233_powers; 1603 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf233_powers); 1604 lp->hw->phy->supported.cca_ed_levels = at86rf233_ed_levels; 1605 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf233_ed_levels); 1606 break; 1607 default: 1608 chip = "unknown"; 1609 rc = -ENOTSUPP; 1610 goto not_supp; 1611 } 1612 1613 lp->hw->phy->cca_ed_level = lp->hw->phy->supported.cca_ed_levels[7]; 1614 lp->hw->phy->transmit_power = lp->hw->phy->supported.tx_powers[0]; 1615 1616 not_supp: 1617 dev_info(&lp->spi->dev, "Detected %s chip version %d\n", chip, version); 1618 1619 return rc; 1620 } 1621 1622 #ifdef CONFIG_IEEE802154_AT86RF230_DEBUGFS 1623 static struct dentry *at86rf230_debugfs_root; 1624 1625 static int at86rf230_stats_show(struct seq_file *file, void *offset) 1626 { 1627 struct at86rf230_local *lp = file->private; 1628 1629 seq_printf(file, "SUCCESS:\t\t%8llu\n", lp->trac.success); 1630 seq_printf(file, "SUCCESS_DATA_PENDING:\t%8llu\n", 1631 lp->trac.success_data_pending); 1632 seq_printf(file, "SUCCESS_WAIT_FOR_ACK:\t%8llu\n", 1633 lp->trac.success_wait_for_ack); 1634 seq_printf(file, "CHANNEL_ACCESS_FAILURE:\t%8llu\n", 1635 lp->trac.channel_access_failure); 1636 seq_printf(file, "NO_ACK:\t\t\t%8llu\n", lp->trac.no_ack); 1637 seq_printf(file, "INVALID:\t\t%8llu\n", lp->trac.invalid); 1638 return 0; 1639 } 1640 1641 static int at86rf230_stats_open(struct inode *inode, struct file *file) 1642 { 1643 return single_open(file, at86rf230_stats_show, inode->i_private); 1644 } 1645 1646 static const struct file_operations at86rf230_stats_fops = { 1647 .open = at86rf230_stats_open, 1648 .read = seq_read, 1649 .llseek = seq_lseek, 1650 .release = single_release, 1651 }; 1652 1653 static int at86rf230_debugfs_init(struct at86rf230_local *lp) 1654 { 1655 char debugfs_dir_name[DNAME_INLINE_LEN + 1] = "at86rf230-"; 1656 struct dentry *stats; 1657 1658 strncat(debugfs_dir_name, dev_name(&lp->spi->dev), DNAME_INLINE_LEN); 1659 1660 at86rf230_debugfs_root = debugfs_create_dir(debugfs_dir_name, NULL); 1661 if (!at86rf230_debugfs_root) 1662 return -ENOMEM; 1663 1664 stats = debugfs_create_file("trac_stats", 0444, 1665 at86rf230_debugfs_root, lp, 1666 &at86rf230_stats_fops); 1667 if (!stats) 1668 return -ENOMEM; 1669 1670 return 0; 1671 } 1672 1673 static void at86rf230_debugfs_remove(void) 1674 { 1675 debugfs_remove_recursive(at86rf230_debugfs_root); 1676 } 1677 #else 1678 static int at86rf230_debugfs_init(struct at86rf230_local *lp) { return 0; } 1679 static void at86rf230_debugfs_remove(void) { } 1680 #endif 1681 1682 static int at86rf230_probe(struct spi_device *spi) 1683 { 1684 struct ieee802154_hw *hw; 1685 struct at86rf230_local *lp; 1686 unsigned int status; 1687 int rc, irq_type, rstn, slp_tr; 1688 u8 xtal_trim = 0; 1689 1690 if (!spi->irq) { 1691 dev_err(&spi->dev, "no IRQ specified\n"); 1692 return -EINVAL; 1693 } 1694 1695 rc = at86rf230_get_pdata(spi, &rstn, &slp_tr, &xtal_trim); 1696 if (rc < 0) { 1697 dev_err(&spi->dev, "failed to parse platform_data: %d\n", rc); 1698 return rc; 1699 } 1700 1701 if (gpio_is_valid(rstn)) { 1702 rc = devm_gpio_request_one(&spi->dev, rstn, 1703 GPIOF_OUT_INIT_HIGH, "rstn"); 1704 if (rc) 1705 return rc; 1706 } 1707 1708 if (gpio_is_valid(slp_tr)) { 1709 rc = devm_gpio_request_one(&spi->dev, slp_tr, 1710 GPIOF_OUT_INIT_LOW, "slp_tr"); 1711 if (rc) 1712 return rc; 1713 } 1714 1715 /* Reset */ 1716 if (gpio_is_valid(rstn)) { 1717 udelay(1); 1718 gpio_set_value_cansleep(rstn, 0); 1719 udelay(1); 1720 gpio_set_value_cansleep(rstn, 1); 1721 usleep_range(120, 240); 1722 } 1723 1724 hw = ieee802154_alloc_hw(sizeof(*lp), &at86rf230_ops); 1725 if (!hw) 1726 return -ENOMEM; 1727 1728 lp = hw->priv; 1729 lp->hw = hw; 1730 lp->spi = spi; 1731 lp->slp_tr = slp_tr; 1732 hw->parent = &spi->dev; 1733 ieee802154_random_extended_addr(&hw->phy->perm_extended_addr); 1734 1735 lp->regmap = devm_regmap_init_spi(spi, &at86rf230_regmap_spi_config); 1736 if (IS_ERR(lp->regmap)) { 1737 rc = PTR_ERR(lp->regmap); 1738 dev_err(&spi->dev, "Failed to allocate register map: %d\n", 1739 rc); 1740 goto free_dev; 1741 } 1742 1743 at86rf230_setup_spi_messages(lp, &lp->state); 1744 at86rf230_setup_spi_messages(lp, &lp->tx); 1745 1746 rc = at86rf230_detect_device(lp); 1747 if (rc < 0) 1748 goto free_dev; 1749 1750 init_completion(&lp->state_complete); 1751 1752 spi_set_drvdata(spi, lp); 1753 1754 rc = at86rf230_hw_init(lp, xtal_trim); 1755 if (rc) 1756 goto free_dev; 1757 1758 /* Read irq status register to reset irq line */ 1759 rc = at86rf230_read_subreg(lp, RG_IRQ_STATUS, 0xff, 0, &status); 1760 if (rc) 1761 goto free_dev; 1762 1763 irq_type = irq_get_trigger_type(spi->irq); 1764 if (!irq_type) 1765 irq_type = IRQF_TRIGGER_HIGH; 1766 1767 rc = devm_request_irq(&spi->dev, spi->irq, at86rf230_isr, 1768 IRQF_SHARED | irq_type, dev_name(&spi->dev), lp); 1769 if (rc) 1770 goto free_dev; 1771 1772 /* disable_irq by default and wait for starting hardware */ 1773 disable_irq(spi->irq); 1774 1775 /* going into sleep by default */ 1776 at86rf230_sleep(lp); 1777 1778 rc = at86rf230_debugfs_init(lp); 1779 if (rc) 1780 goto free_dev; 1781 1782 rc = ieee802154_register_hw(lp->hw); 1783 if (rc) 1784 goto free_debugfs; 1785 1786 return rc; 1787 1788 free_debugfs: 1789 at86rf230_debugfs_remove(); 1790 free_dev: 1791 ieee802154_free_hw(lp->hw); 1792 1793 return rc; 1794 } 1795 1796 static int at86rf230_remove(struct spi_device *spi) 1797 { 1798 struct at86rf230_local *lp = spi_get_drvdata(spi); 1799 1800 /* mask all at86rf230 irq's */ 1801 at86rf230_write_subreg(lp, SR_IRQ_MASK, 0); 1802 ieee802154_unregister_hw(lp->hw); 1803 ieee802154_free_hw(lp->hw); 1804 at86rf230_debugfs_remove(); 1805 dev_dbg(&spi->dev, "unregistered at86rf230\n"); 1806 1807 return 0; 1808 } 1809 1810 static const struct of_device_id at86rf230_of_match[] = { 1811 { .compatible = "atmel,at86rf230", }, 1812 { .compatible = "atmel,at86rf231", }, 1813 { .compatible = "atmel,at86rf233", }, 1814 { .compatible = "atmel,at86rf212", }, 1815 { }, 1816 }; 1817 MODULE_DEVICE_TABLE(of, at86rf230_of_match); 1818 1819 static const struct spi_device_id at86rf230_device_id[] = { 1820 { .name = "at86rf230", }, 1821 { .name = "at86rf231", }, 1822 { .name = "at86rf233", }, 1823 { .name = "at86rf212", }, 1824 { }, 1825 }; 1826 MODULE_DEVICE_TABLE(spi, at86rf230_device_id); 1827 1828 static struct spi_driver at86rf230_driver = { 1829 .id_table = at86rf230_device_id, 1830 .driver = { 1831 .of_match_table = of_match_ptr(at86rf230_of_match), 1832 .name = "at86rf230", 1833 }, 1834 .probe = at86rf230_probe, 1835 .remove = at86rf230_remove, 1836 }; 1837 1838 module_spi_driver(at86rf230_driver); 1839 1840 MODULE_DESCRIPTION("AT86RF230 Transceiver Driver"); 1841 MODULE_LICENSE("GPL v2"); 1842