1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * AT86RF230/RF231 driver 4 * 5 * Copyright (C) 2009-2012 Siemens AG 6 * 7 * Written by: 8 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> 9 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com> 10 * Alexander Aring <aar@pengutronix.de> 11 */ 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/hrtimer.h> 15 #include <linux/jiffies.h> 16 #include <linux/interrupt.h> 17 #include <linux/irq.h> 18 #include <linux/gpio.h> 19 #include <linux/delay.h> 20 #include <linux/spi/spi.h> 21 #include <linux/spi/at86rf230.h> 22 #include <linux/regmap.h> 23 #include <linux/skbuff.h> 24 #include <linux/of_gpio.h> 25 #include <linux/ieee802154.h> 26 #include <linux/debugfs.h> 27 28 #include <net/mac802154.h> 29 #include <net/cfg802154.h> 30 31 #include "at86rf230.h" 32 33 struct at86rf230_local; 34 /* at86rf2xx chip depend data. 35 * All timings are in us. 36 */ 37 struct at86rf2xx_chip_data { 38 u16 t_sleep_cycle; 39 u16 t_channel_switch; 40 u16 t_reset_to_off; 41 u16 t_off_to_aack; 42 u16 t_off_to_tx_on; 43 u16 t_off_to_sleep; 44 u16 t_sleep_to_off; 45 u16 t_frame; 46 u16 t_p_ack; 47 int rssi_base_val; 48 49 int (*set_channel)(struct at86rf230_local *, u8, u8); 50 int (*set_txpower)(struct at86rf230_local *, s32); 51 }; 52 53 #define AT86RF2XX_MAX_BUF (127 + 3) 54 /* tx retries to access the TX_ON state 55 * if it's above then force change will be started. 56 * 57 * We assume the max_frame_retries (7) value of 802.15.4 here. 58 */ 59 #define AT86RF2XX_MAX_TX_RETRIES 7 60 /* We use the recommended 5 minutes timeout to recalibrate */ 61 #define AT86RF2XX_CAL_LOOP_TIMEOUT (5 * 60 * HZ) 62 63 struct at86rf230_state_change { 64 struct at86rf230_local *lp; 65 int irq; 66 67 struct hrtimer timer; 68 struct spi_message msg; 69 struct spi_transfer trx; 70 u8 buf[AT86RF2XX_MAX_BUF]; 71 72 void (*complete)(void *context); 73 u8 from_state; 74 u8 to_state; 75 76 bool free; 77 }; 78 79 struct at86rf230_trac { 80 u64 success; 81 u64 success_data_pending; 82 u64 success_wait_for_ack; 83 u64 channel_access_failure; 84 u64 no_ack; 85 u64 invalid; 86 }; 87 88 struct at86rf230_local { 89 struct spi_device *spi; 90 91 struct ieee802154_hw *hw; 92 struct at86rf2xx_chip_data *data; 93 struct regmap *regmap; 94 int slp_tr; 95 bool sleep; 96 97 struct completion state_complete; 98 struct at86rf230_state_change state; 99 100 unsigned long cal_timeout; 101 bool is_tx; 102 bool is_tx_from_off; 103 bool was_tx; 104 u8 tx_retry; 105 struct sk_buff *tx_skb; 106 struct at86rf230_state_change tx; 107 108 struct at86rf230_trac trac; 109 }; 110 111 #define AT86RF2XX_NUMREGS 0x3F 112 113 static void 114 at86rf230_async_state_change(struct at86rf230_local *lp, 115 struct at86rf230_state_change *ctx, 116 const u8 state, void (*complete)(void *context)); 117 118 static inline void 119 at86rf230_sleep(struct at86rf230_local *lp) 120 { 121 if (gpio_is_valid(lp->slp_tr)) { 122 gpio_set_value(lp->slp_tr, 1); 123 usleep_range(lp->data->t_off_to_sleep, 124 lp->data->t_off_to_sleep + 10); 125 lp->sleep = true; 126 } 127 } 128 129 static inline void 130 at86rf230_awake(struct at86rf230_local *lp) 131 { 132 if (gpio_is_valid(lp->slp_tr)) { 133 gpio_set_value(lp->slp_tr, 0); 134 usleep_range(lp->data->t_sleep_to_off, 135 lp->data->t_sleep_to_off + 100); 136 lp->sleep = false; 137 } 138 } 139 140 static inline int 141 __at86rf230_write(struct at86rf230_local *lp, 142 unsigned int addr, unsigned int data) 143 { 144 bool sleep = lp->sleep; 145 int ret; 146 147 /* awake for register setting if sleep */ 148 if (sleep) 149 at86rf230_awake(lp); 150 151 ret = regmap_write(lp->regmap, addr, data); 152 153 /* sleep again if was sleeping */ 154 if (sleep) 155 at86rf230_sleep(lp); 156 157 return ret; 158 } 159 160 static inline int 161 __at86rf230_read(struct at86rf230_local *lp, 162 unsigned int addr, unsigned int *data) 163 { 164 bool sleep = lp->sleep; 165 int ret; 166 167 /* awake for register setting if sleep */ 168 if (sleep) 169 at86rf230_awake(lp); 170 171 ret = regmap_read(lp->regmap, addr, data); 172 173 /* sleep again if was sleeping */ 174 if (sleep) 175 at86rf230_sleep(lp); 176 177 return ret; 178 } 179 180 static inline int 181 at86rf230_read_subreg(struct at86rf230_local *lp, 182 unsigned int addr, unsigned int mask, 183 unsigned int shift, unsigned int *data) 184 { 185 int rc; 186 187 rc = __at86rf230_read(lp, addr, data); 188 if (!rc) 189 *data = (*data & mask) >> shift; 190 191 return rc; 192 } 193 194 static inline int 195 at86rf230_write_subreg(struct at86rf230_local *lp, 196 unsigned int addr, unsigned int mask, 197 unsigned int shift, unsigned int data) 198 { 199 bool sleep = lp->sleep; 200 int ret; 201 202 /* awake for register setting if sleep */ 203 if (sleep) 204 at86rf230_awake(lp); 205 206 ret = regmap_update_bits(lp->regmap, addr, mask, data << shift); 207 208 /* sleep again if was sleeping */ 209 if (sleep) 210 at86rf230_sleep(lp); 211 212 return ret; 213 } 214 215 static inline void 216 at86rf230_slp_tr_rising_edge(struct at86rf230_local *lp) 217 { 218 gpio_set_value(lp->slp_tr, 1); 219 udelay(1); 220 gpio_set_value(lp->slp_tr, 0); 221 } 222 223 static bool 224 at86rf230_reg_writeable(struct device *dev, unsigned int reg) 225 { 226 switch (reg) { 227 case RG_TRX_STATE: 228 case RG_TRX_CTRL_0: 229 case RG_TRX_CTRL_1: 230 case RG_PHY_TX_PWR: 231 case RG_PHY_ED_LEVEL: 232 case RG_PHY_CC_CCA: 233 case RG_CCA_THRES: 234 case RG_RX_CTRL: 235 case RG_SFD_VALUE: 236 case RG_TRX_CTRL_2: 237 case RG_ANT_DIV: 238 case RG_IRQ_MASK: 239 case RG_VREG_CTRL: 240 case RG_BATMON: 241 case RG_XOSC_CTRL: 242 case RG_RX_SYN: 243 case RG_XAH_CTRL_1: 244 case RG_FTN_CTRL: 245 case RG_PLL_CF: 246 case RG_PLL_DCU: 247 case RG_SHORT_ADDR_0: 248 case RG_SHORT_ADDR_1: 249 case RG_PAN_ID_0: 250 case RG_PAN_ID_1: 251 case RG_IEEE_ADDR_0: 252 case RG_IEEE_ADDR_1: 253 case RG_IEEE_ADDR_2: 254 case RG_IEEE_ADDR_3: 255 case RG_IEEE_ADDR_4: 256 case RG_IEEE_ADDR_5: 257 case RG_IEEE_ADDR_6: 258 case RG_IEEE_ADDR_7: 259 case RG_XAH_CTRL_0: 260 case RG_CSMA_SEED_0: 261 case RG_CSMA_SEED_1: 262 case RG_CSMA_BE: 263 return true; 264 default: 265 return false; 266 } 267 } 268 269 static bool 270 at86rf230_reg_readable(struct device *dev, unsigned int reg) 271 { 272 bool rc; 273 274 /* all writeable are also readable */ 275 rc = at86rf230_reg_writeable(dev, reg); 276 if (rc) 277 return rc; 278 279 /* readonly regs */ 280 switch (reg) { 281 case RG_TRX_STATUS: 282 case RG_PHY_RSSI: 283 case RG_IRQ_STATUS: 284 case RG_PART_NUM: 285 case RG_VERSION_NUM: 286 case RG_MAN_ID_1: 287 case RG_MAN_ID_0: 288 return true; 289 default: 290 return false; 291 } 292 } 293 294 static bool 295 at86rf230_reg_volatile(struct device *dev, unsigned int reg) 296 { 297 /* can be changed during runtime */ 298 switch (reg) { 299 case RG_TRX_STATUS: 300 case RG_TRX_STATE: 301 case RG_PHY_RSSI: 302 case RG_PHY_ED_LEVEL: 303 case RG_IRQ_STATUS: 304 case RG_VREG_CTRL: 305 case RG_PLL_CF: 306 case RG_PLL_DCU: 307 return true; 308 default: 309 return false; 310 } 311 } 312 313 static bool 314 at86rf230_reg_precious(struct device *dev, unsigned int reg) 315 { 316 /* don't clear irq line on read */ 317 switch (reg) { 318 case RG_IRQ_STATUS: 319 return true; 320 default: 321 return false; 322 } 323 } 324 325 static const struct regmap_config at86rf230_regmap_spi_config = { 326 .reg_bits = 8, 327 .val_bits = 8, 328 .write_flag_mask = CMD_REG | CMD_WRITE, 329 .read_flag_mask = CMD_REG, 330 .cache_type = REGCACHE_RBTREE, 331 .max_register = AT86RF2XX_NUMREGS, 332 .writeable_reg = at86rf230_reg_writeable, 333 .readable_reg = at86rf230_reg_readable, 334 .volatile_reg = at86rf230_reg_volatile, 335 .precious_reg = at86rf230_reg_precious, 336 }; 337 338 static void 339 at86rf230_async_error_recover_complete(void *context) 340 { 341 struct at86rf230_state_change *ctx = context; 342 struct at86rf230_local *lp = ctx->lp; 343 344 if (ctx->free) 345 kfree(ctx); 346 347 if (lp->was_tx) { 348 lp->was_tx = 0; 349 dev_kfree_skb_any(lp->tx_skb); 350 ieee802154_wake_queue(lp->hw); 351 } 352 } 353 354 static void 355 at86rf230_async_error_recover(void *context) 356 { 357 struct at86rf230_state_change *ctx = context; 358 struct at86rf230_local *lp = ctx->lp; 359 360 if (lp->is_tx) { 361 lp->was_tx = 1; 362 lp->is_tx = 0; 363 } 364 365 at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON, 366 at86rf230_async_error_recover_complete); 367 } 368 369 static inline void 370 at86rf230_async_error(struct at86rf230_local *lp, 371 struct at86rf230_state_change *ctx, int rc) 372 { 373 dev_err(&lp->spi->dev, "spi_async error %d\n", rc); 374 375 at86rf230_async_state_change(lp, ctx, STATE_FORCE_TRX_OFF, 376 at86rf230_async_error_recover); 377 } 378 379 /* Generic function to get some register value in async mode */ 380 static void 381 at86rf230_async_read_reg(struct at86rf230_local *lp, u8 reg, 382 struct at86rf230_state_change *ctx, 383 void (*complete)(void *context)) 384 { 385 int rc; 386 387 u8 *tx_buf = ctx->buf; 388 389 tx_buf[0] = (reg & CMD_REG_MASK) | CMD_REG; 390 ctx->msg.complete = complete; 391 rc = spi_async(lp->spi, &ctx->msg); 392 if (rc) 393 at86rf230_async_error(lp, ctx, rc); 394 } 395 396 static void 397 at86rf230_async_write_reg(struct at86rf230_local *lp, u8 reg, u8 val, 398 struct at86rf230_state_change *ctx, 399 void (*complete)(void *context)) 400 { 401 int rc; 402 403 ctx->buf[0] = (reg & CMD_REG_MASK) | CMD_REG | CMD_WRITE; 404 ctx->buf[1] = val; 405 ctx->msg.complete = complete; 406 rc = spi_async(lp->spi, &ctx->msg); 407 if (rc) 408 at86rf230_async_error(lp, ctx, rc); 409 } 410 411 static void 412 at86rf230_async_state_assert(void *context) 413 { 414 struct at86rf230_state_change *ctx = context; 415 struct at86rf230_local *lp = ctx->lp; 416 const u8 *buf = ctx->buf; 417 const u8 trx_state = buf[1] & TRX_STATE_MASK; 418 419 /* Assert state change */ 420 if (trx_state != ctx->to_state) { 421 /* Special handling if transceiver state is in 422 * STATE_BUSY_RX_AACK and a SHR was detected. 423 */ 424 if (trx_state == STATE_BUSY_RX_AACK) { 425 /* Undocumented race condition. If we send a state 426 * change to STATE_RX_AACK_ON the transceiver could 427 * change his state automatically to STATE_BUSY_RX_AACK 428 * if a SHR was detected. This is not an error, but we 429 * can't assert this. 430 */ 431 if (ctx->to_state == STATE_RX_AACK_ON) 432 goto done; 433 434 /* If we change to STATE_TX_ON without forcing and 435 * transceiver state is STATE_BUSY_RX_AACK, we wait 436 * 'tFrame + tPAck' receiving time. In this time the 437 * PDU should be received. If the transceiver is still 438 * in STATE_BUSY_RX_AACK, we run a force state change 439 * to STATE_TX_ON. This is a timeout handling, if the 440 * transceiver stucks in STATE_BUSY_RX_AACK. 441 * 442 * Additional we do several retries to try to get into 443 * TX_ON state without forcing. If the retries are 444 * higher or equal than AT86RF2XX_MAX_TX_RETRIES we 445 * will do a force change. 446 */ 447 if (ctx->to_state == STATE_TX_ON || 448 ctx->to_state == STATE_TRX_OFF) { 449 u8 state = ctx->to_state; 450 451 if (lp->tx_retry >= AT86RF2XX_MAX_TX_RETRIES) 452 state = STATE_FORCE_TRX_OFF; 453 lp->tx_retry++; 454 455 at86rf230_async_state_change(lp, ctx, state, 456 ctx->complete); 457 return; 458 } 459 } 460 461 dev_warn(&lp->spi->dev, "unexcept state change from 0x%02x to 0x%02x. Actual state: 0x%02x\n", 462 ctx->from_state, ctx->to_state, trx_state); 463 } 464 465 done: 466 if (ctx->complete) 467 ctx->complete(context); 468 } 469 470 static enum hrtimer_restart at86rf230_async_state_timer(struct hrtimer *timer) 471 { 472 struct at86rf230_state_change *ctx = 473 container_of(timer, struct at86rf230_state_change, timer); 474 struct at86rf230_local *lp = ctx->lp; 475 476 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx, 477 at86rf230_async_state_assert); 478 479 return HRTIMER_NORESTART; 480 } 481 482 /* Do state change timing delay. */ 483 static void 484 at86rf230_async_state_delay(void *context) 485 { 486 struct at86rf230_state_change *ctx = context; 487 struct at86rf230_local *lp = ctx->lp; 488 struct at86rf2xx_chip_data *c = lp->data; 489 bool force = false; 490 ktime_t tim; 491 492 /* The force state changes are will show as normal states in the 493 * state status subregister. We change the to_state to the 494 * corresponding one and remember if it was a force change, this 495 * differs if we do a state change from STATE_BUSY_RX_AACK. 496 */ 497 switch (ctx->to_state) { 498 case STATE_FORCE_TX_ON: 499 ctx->to_state = STATE_TX_ON; 500 force = true; 501 break; 502 case STATE_FORCE_TRX_OFF: 503 ctx->to_state = STATE_TRX_OFF; 504 force = true; 505 break; 506 default: 507 break; 508 } 509 510 switch (ctx->from_state) { 511 case STATE_TRX_OFF: 512 switch (ctx->to_state) { 513 case STATE_RX_AACK_ON: 514 tim = c->t_off_to_aack * NSEC_PER_USEC; 515 /* state change from TRX_OFF to RX_AACK_ON to do a 516 * calibration, we need to reset the timeout for the 517 * next one. 518 */ 519 lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT; 520 goto change; 521 case STATE_TX_ARET_ON: 522 case STATE_TX_ON: 523 tim = c->t_off_to_tx_on * NSEC_PER_USEC; 524 /* state change from TRX_OFF to TX_ON or ARET_ON to do 525 * a calibration, we need to reset the timeout for the 526 * next one. 527 */ 528 lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT; 529 goto change; 530 default: 531 break; 532 } 533 break; 534 case STATE_BUSY_RX_AACK: 535 switch (ctx->to_state) { 536 case STATE_TRX_OFF: 537 case STATE_TX_ON: 538 /* Wait for worst case receiving time if we 539 * didn't make a force change from BUSY_RX_AACK 540 * to TX_ON or TRX_OFF. 541 */ 542 if (!force) { 543 tim = (c->t_frame + c->t_p_ack) * NSEC_PER_USEC; 544 goto change; 545 } 546 break; 547 default: 548 break; 549 } 550 break; 551 /* Default value, means RESET state */ 552 case STATE_P_ON: 553 switch (ctx->to_state) { 554 case STATE_TRX_OFF: 555 tim = c->t_reset_to_off * NSEC_PER_USEC; 556 goto change; 557 default: 558 break; 559 } 560 break; 561 default: 562 break; 563 } 564 565 /* Default delay is 1us in the most cases */ 566 udelay(1); 567 at86rf230_async_state_timer(&ctx->timer); 568 return; 569 570 change: 571 hrtimer_start(&ctx->timer, tim, HRTIMER_MODE_REL); 572 } 573 574 static void 575 at86rf230_async_state_change_start(void *context) 576 { 577 struct at86rf230_state_change *ctx = context; 578 struct at86rf230_local *lp = ctx->lp; 579 u8 *buf = ctx->buf; 580 const u8 trx_state = buf[1] & TRX_STATE_MASK; 581 582 /* Check for "possible" STATE_TRANSITION_IN_PROGRESS */ 583 if (trx_state == STATE_TRANSITION_IN_PROGRESS) { 584 udelay(1); 585 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx, 586 at86rf230_async_state_change_start); 587 return; 588 } 589 590 /* Check if we already are in the state which we change in */ 591 if (trx_state == ctx->to_state) { 592 if (ctx->complete) 593 ctx->complete(context); 594 return; 595 } 596 597 /* Set current state to the context of state change */ 598 ctx->from_state = trx_state; 599 600 /* Going into the next step for a state change which do a timing 601 * relevant delay. 602 */ 603 at86rf230_async_write_reg(lp, RG_TRX_STATE, ctx->to_state, ctx, 604 at86rf230_async_state_delay); 605 } 606 607 static void 608 at86rf230_async_state_change(struct at86rf230_local *lp, 609 struct at86rf230_state_change *ctx, 610 const u8 state, void (*complete)(void *context)) 611 { 612 /* Initialization for the state change context */ 613 ctx->to_state = state; 614 ctx->complete = complete; 615 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx, 616 at86rf230_async_state_change_start); 617 } 618 619 static void 620 at86rf230_sync_state_change_complete(void *context) 621 { 622 struct at86rf230_state_change *ctx = context; 623 struct at86rf230_local *lp = ctx->lp; 624 625 complete(&lp->state_complete); 626 } 627 628 /* This function do a sync framework above the async state change. 629 * Some callbacks of the IEEE 802.15.4 driver interface need to be 630 * handled synchronously. 631 */ 632 static int 633 at86rf230_sync_state_change(struct at86rf230_local *lp, unsigned int state) 634 { 635 unsigned long rc; 636 637 at86rf230_async_state_change(lp, &lp->state, state, 638 at86rf230_sync_state_change_complete); 639 640 rc = wait_for_completion_timeout(&lp->state_complete, 641 msecs_to_jiffies(100)); 642 if (!rc) { 643 at86rf230_async_error(lp, &lp->state, -ETIMEDOUT); 644 return -ETIMEDOUT; 645 } 646 647 return 0; 648 } 649 650 static void 651 at86rf230_tx_complete(void *context) 652 { 653 struct at86rf230_state_change *ctx = context; 654 struct at86rf230_local *lp = ctx->lp; 655 656 ieee802154_xmit_complete(lp->hw, lp->tx_skb, false); 657 kfree(ctx); 658 } 659 660 static void 661 at86rf230_tx_on(void *context) 662 { 663 struct at86rf230_state_change *ctx = context; 664 struct at86rf230_local *lp = ctx->lp; 665 666 at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON, 667 at86rf230_tx_complete); 668 } 669 670 static void 671 at86rf230_tx_trac_check(void *context) 672 { 673 struct at86rf230_state_change *ctx = context; 674 struct at86rf230_local *lp = ctx->lp; 675 676 if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS)) { 677 u8 trac = TRAC_MASK(ctx->buf[1]); 678 679 switch (trac) { 680 case TRAC_SUCCESS: 681 lp->trac.success++; 682 break; 683 case TRAC_SUCCESS_DATA_PENDING: 684 lp->trac.success_data_pending++; 685 break; 686 case TRAC_CHANNEL_ACCESS_FAILURE: 687 lp->trac.channel_access_failure++; 688 break; 689 case TRAC_NO_ACK: 690 lp->trac.no_ack++; 691 break; 692 case TRAC_INVALID: 693 lp->trac.invalid++; 694 break; 695 default: 696 WARN_ONCE(1, "received tx trac status %d\n", trac); 697 break; 698 } 699 } 700 701 at86rf230_async_state_change(lp, ctx, STATE_TX_ON, at86rf230_tx_on); 702 } 703 704 static void 705 at86rf230_rx_read_frame_complete(void *context) 706 { 707 struct at86rf230_state_change *ctx = context; 708 struct at86rf230_local *lp = ctx->lp; 709 const u8 *buf = ctx->buf; 710 struct sk_buff *skb; 711 u8 len, lqi; 712 713 len = buf[1]; 714 if (!ieee802154_is_valid_psdu_len(len)) { 715 dev_vdbg(&lp->spi->dev, "corrupted frame received\n"); 716 len = IEEE802154_MTU; 717 } 718 lqi = buf[2 + len]; 719 720 skb = dev_alloc_skb(IEEE802154_MTU); 721 if (!skb) { 722 dev_vdbg(&lp->spi->dev, "failed to allocate sk_buff\n"); 723 kfree(ctx); 724 return; 725 } 726 727 skb_put_data(skb, buf + 2, len); 728 ieee802154_rx_irqsafe(lp->hw, skb, lqi); 729 kfree(ctx); 730 } 731 732 static void 733 at86rf230_rx_trac_check(void *context) 734 { 735 struct at86rf230_state_change *ctx = context; 736 struct at86rf230_local *lp = ctx->lp; 737 u8 *buf = ctx->buf; 738 int rc; 739 740 if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS)) { 741 u8 trac = TRAC_MASK(buf[1]); 742 743 switch (trac) { 744 case TRAC_SUCCESS: 745 lp->trac.success++; 746 break; 747 case TRAC_SUCCESS_WAIT_FOR_ACK: 748 lp->trac.success_wait_for_ack++; 749 break; 750 case TRAC_INVALID: 751 lp->trac.invalid++; 752 break; 753 default: 754 WARN_ONCE(1, "received rx trac status %d\n", trac); 755 break; 756 } 757 } 758 759 buf[0] = CMD_FB; 760 ctx->trx.len = AT86RF2XX_MAX_BUF; 761 ctx->msg.complete = at86rf230_rx_read_frame_complete; 762 rc = spi_async(lp->spi, &ctx->msg); 763 if (rc) { 764 ctx->trx.len = 2; 765 at86rf230_async_error(lp, ctx, rc); 766 } 767 } 768 769 static void 770 at86rf230_irq_trx_end(void *context) 771 { 772 struct at86rf230_state_change *ctx = context; 773 struct at86rf230_local *lp = ctx->lp; 774 775 if (lp->is_tx) { 776 lp->is_tx = 0; 777 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx, 778 at86rf230_tx_trac_check); 779 } else { 780 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx, 781 at86rf230_rx_trac_check); 782 } 783 } 784 785 static void 786 at86rf230_irq_status(void *context) 787 { 788 struct at86rf230_state_change *ctx = context; 789 struct at86rf230_local *lp = ctx->lp; 790 const u8 *buf = ctx->buf; 791 u8 irq = buf[1]; 792 793 enable_irq(lp->spi->irq); 794 795 if (irq & IRQ_TRX_END) { 796 at86rf230_irq_trx_end(ctx); 797 } else { 798 dev_err(&lp->spi->dev, "not supported irq %02x received\n", 799 irq); 800 kfree(ctx); 801 } 802 } 803 804 static void 805 at86rf230_setup_spi_messages(struct at86rf230_local *lp, 806 struct at86rf230_state_change *state) 807 { 808 state->lp = lp; 809 state->irq = lp->spi->irq; 810 spi_message_init(&state->msg); 811 state->msg.context = state; 812 state->trx.len = 2; 813 state->trx.tx_buf = state->buf; 814 state->trx.rx_buf = state->buf; 815 spi_message_add_tail(&state->trx, &state->msg); 816 hrtimer_init(&state->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 817 state->timer.function = at86rf230_async_state_timer; 818 } 819 820 static irqreturn_t at86rf230_isr(int irq, void *data) 821 { 822 struct at86rf230_local *lp = data; 823 struct at86rf230_state_change *ctx; 824 int rc; 825 826 disable_irq_nosync(irq); 827 828 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC); 829 if (!ctx) { 830 enable_irq(irq); 831 return IRQ_NONE; 832 } 833 834 at86rf230_setup_spi_messages(lp, ctx); 835 /* tell on error handling to free ctx */ 836 ctx->free = true; 837 838 ctx->buf[0] = (RG_IRQ_STATUS & CMD_REG_MASK) | CMD_REG; 839 ctx->msg.complete = at86rf230_irq_status; 840 rc = spi_async(lp->spi, &ctx->msg); 841 if (rc) { 842 at86rf230_async_error(lp, ctx, rc); 843 enable_irq(irq); 844 return IRQ_NONE; 845 } 846 847 return IRQ_HANDLED; 848 } 849 850 static void 851 at86rf230_write_frame_complete(void *context) 852 { 853 struct at86rf230_state_change *ctx = context; 854 struct at86rf230_local *lp = ctx->lp; 855 856 ctx->trx.len = 2; 857 858 if (gpio_is_valid(lp->slp_tr)) 859 at86rf230_slp_tr_rising_edge(lp); 860 else 861 at86rf230_async_write_reg(lp, RG_TRX_STATE, STATE_BUSY_TX, ctx, 862 NULL); 863 } 864 865 static void 866 at86rf230_write_frame(void *context) 867 { 868 struct at86rf230_state_change *ctx = context; 869 struct at86rf230_local *lp = ctx->lp; 870 struct sk_buff *skb = lp->tx_skb; 871 u8 *buf = ctx->buf; 872 int rc; 873 874 lp->is_tx = 1; 875 876 buf[0] = CMD_FB | CMD_WRITE; 877 buf[1] = skb->len + 2; 878 memcpy(buf + 2, skb->data, skb->len); 879 ctx->trx.len = skb->len + 2; 880 ctx->msg.complete = at86rf230_write_frame_complete; 881 rc = spi_async(lp->spi, &ctx->msg); 882 if (rc) { 883 ctx->trx.len = 2; 884 at86rf230_async_error(lp, ctx, rc); 885 } 886 } 887 888 static void 889 at86rf230_xmit_tx_on(void *context) 890 { 891 struct at86rf230_state_change *ctx = context; 892 struct at86rf230_local *lp = ctx->lp; 893 894 at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON, 895 at86rf230_write_frame); 896 } 897 898 static void 899 at86rf230_xmit_start(void *context) 900 { 901 struct at86rf230_state_change *ctx = context; 902 struct at86rf230_local *lp = ctx->lp; 903 904 /* check if we change from off state */ 905 if (lp->is_tx_from_off) 906 at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON, 907 at86rf230_write_frame); 908 else 909 at86rf230_async_state_change(lp, ctx, STATE_TX_ON, 910 at86rf230_xmit_tx_on); 911 } 912 913 static int 914 at86rf230_xmit(struct ieee802154_hw *hw, struct sk_buff *skb) 915 { 916 struct at86rf230_local *lp = hw->priv; 917 struct at86rf230_state_change *ctx = &lp->tx; 918 919 lp->tx_skb = skb; 920 lp->tx_retry = 0; 921 922 /* After 5 minutes in PLL and the same frequency we run again the 923 * calibration loops which is recommended by at86rf2xx datasheets. 924 * 925 * The calibration is initiate by a state change from TRX_OFF 926 * to TX_ON, the lp->cal_timeout should be reinit by state_delay 927 * function then to start in the next 5 minutes. 928 */ 929 if (time_is_before_jiffies(lp->cal_timeout)) { 930 lp->is_tx_from_off = true; 931 at86rf230_async_state_change(lp, ctx, STATE_TRX_OFF, 932 at86rf230_xmit_start); 933 } else { 934 lp->is_tx_from_off = false; 935 at86rf230_xmit_start(ctx); 936 } 937 938 return 0; 939 } 940 941 static int 942 at86rf230_ed(struct ieee802154_hw *hw, u8 *level) 943 { 944 WARN_ON(!level); 945 *level = 0xbe; 946 return 0; 947 } 948 949 static int 950 at86rf230_start(struct ieee802154_hw *hw) 951 { 952 struct at86rf230_local *lp = hw->priv; 953 954 /* reset trac stats on start */ 955 if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS)) 956 memset(&lp->trac, 0, sizeof(struct at86rf230_trac)); 957 958 at86rf230_awake(lp); 959 enable_irq(lp->spi->irq); 960 961 return at86rf230_sync_state_change(lp, STATE_RX_AACK_ON); 962 } 963 964 static void 965 at86rf230_stop(struct ieee802154_hw *hw) 966 { 967 struct at86rf230_local *lp = hw->priv; 968 u8 csma_seed[2]; 969 970 at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF); 971 972 disable_irq(lp->spi->irq); 973 974 /* It's recommended to set random new csma_seeds before sleep state. 975 * Makes only sense in the stop callback, not doing this inside of 976 * at86rf230_sleep, this is also used when we don't transmit afterwards 977 * when calling start callback again. 978 */ 979 get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed)); 980 at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]); 981 at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]); 982 983 at86rf230_sleep(lp); 984 } 985 986 static int 987 at86rf23x_set_channel(struct at86rf230_local *lp, u8 page, u8 channel) 988 { 989 return at86rf230_write_subreg(lp, SR_CHANNEL, channel); 990 } 991 992 #define AT86RF2XX_MAX_ED_LEVELS 0xF 993 static const s32 at86rf233_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = { 994 -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000, -7800, -7600, 995 -7400, -7200, -7000, -6800, -6600, -6400, 996 }; 997 998 static const s32 at86rf231_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = { 999 -9100, -8900, -8700, -8500, -8300, -8100, -7900, -7700, -7500, -7300, 1000 -7100, -6900, -6700, -6500, -6300, -6100, 1001 }; 1002 1003 static const s32 at86rf212_ed_levels_100[AT86RF2XX_MAX_ED_LEVELS + 1] = { 1004 -10000, -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200, 1005 -8000, -7800, -7600, -7400, -7200, -7000, 1006 }; 1007 1008 static const s32 at86rf212_ed_levels_98[AT86RF2XX_MAX_ED_LEVELS + 1] = { 1009 -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000, 1010 -7800, -7600, -7400, -7200, -7000, -6800, 1011 }; 1012 1013 static inline int 1014 at86rf212_update_cca_ed_level(struct at86rf230_local *lp, int rssi_base_val) 1015 { 1016 unsigned int cca_ed_thres; 1017 int rc; 1018 1019 rc = at86rf230_read_subreg(lp, SR_CCA_ED_THRES, &cca_ed_thres); 1020 if (rc < 0) 1021 return rc; 1022 1023 switch (rssi_base_val) { 1024 case -98: 1025 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_98; 1026 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_98); 1027 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_98[cca_ed_thres]; 1028 break; 1029 case -100: 1030 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100; 1031 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100); 1032 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_100[cca_ed_thres]; 1033 break; 1034 default: 1035 WARN_ON(1); 1036 } 1037 1038 return 0; 1039 } 1040 1041 static int 1042 at86rf212_set_channel(struct at86rf230_local *lp, u8 page, u8 channel) 1043 { 1044 int rc; 1045 1046 if (channel == 0) 1047 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 0); 1048 else 1049 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 1); 1050 if (rc < 0) 1051 return rc; 1052 1053 if (page == 0) { 1054 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 0); 1055 lp->data->rssi_base_val = -100; 1056 } else { 1057 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 1); 1058 lp->data->rssi_base_val = -98; 1059 } 1060 if (rc < 0) 1061 return rc; 1062 1063 rc = at86rf212_update_cca_ed_level(lp, lp->data->rssi_base_val); 1064 if (rc < 0) 1065 return rc; 1066 1067 /* This sets the symbol_duration according frequency on the 212. 1068 * TODO move this handling while set channel and page in cfg802154. 1069 * We can do that, this timings are according 802.15.4 standard. 1070 * If we do that in cfg802154, this is a more generic calculation. 1071 * 1072 * This should also protected from ifs_timer. Means cancel timer and 1073 * init with a new value. For now, this is okay. 1074 */ 1075 if (channel == 0) { 1076 if (page == 0) { 1077 /* SUB:0 and BPSK:0 -> BPSK-20 */ 1078 lp->hw->phy->symbol_duration = 50; 1079 } else { 1080 /* SUB:1 and BPSK:0 -> BPSK-40 */ 1081 lp->hw->phy->symbol_duration = 25; 1082 } 1083 } else { 1084 if (page == 0) 1085 /* SUB:0 and BPSK:1 -> OQPSK-100/200/400 */ 1086 lp->hw->phy->symbol_duration = 40; 1087 else 1088 /* SUB:1 and BPSK:1 -> OQPSK-250/500/1000 */ 1089 lp->hw->phy->symbol_duration = 16; 1090 } 1091 1092 lp->hw->phy->lifs_period = IEEE802154_LIFS_PERIOD * 1093 lp->hw->phy->symbol_duration; 1094 lp->hw->phy->sifs_period = IEEE802154_SIFS_PERIOD * 1095 lp->hw->phy->symbol_duration; 1096 1097 return at86rf230_write_subreg(lp, SR_CHANNEL, channel); 1098 } 1099 1100 static int 1101 at86rf230_channel(struct ieee802154_hw *hw, u8 page, u8 channel) 1102 { 1103 struct at86rf230_local *lp = hw->priv; 1104 int rc; 1105 1106 rc = lp->data->set_channel(lp, page, channel); 1107 /* Wait for PLL */ 1108 usleep_range(lp->data->t_channel_switch, 1109 lp->data->t_channel_switch + 10); 1110 1111 lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT; 1112 return rc; 1113 } 1114 1115 static int 1116 at86rf230_set_hw_addr_filt(struct ieee802154_hw *hw, 1117 struct ieee802154_hw_addr_filt *filt, 1118 unsigned long changed) 1119 { 1120 struct at86rf230_local *lp = hw->priv; 1121 1122 if (changed & IEEE802154_AFILT_SADDR_CHANGED) { 1123 u16 addr = le16_to_cpu(filt->short_addr); 1124 1125 dev_vdbg(&lp->spi->dev, "%s called for saddr\n", __func__); 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, "%s called for pan id\n", __func__); 1134 __at86rf230_write(lp, RG_PAN_ID_0, pan); 1135 __at86rf230_write(lp, RG_PAN_ID_1, pan >> 8); 1136 } 1137 1138 if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) { 1139 u8 i, addr[8]; 1140 1141 memcpy(addr, &filt->ieee_addr, 8); 1142 dev_vdbg(&lp->spi->dev, "%s called for IEEE addr\n", __func__); 1143 for (i = 0; i < 8; i++) 1144 __at86rf230_write(lp, RG_IEEE_ADDR_0 + i, addr[i]); 1145 } 1146 1147 if (changed & IEEE802154_AFILT_PANC_CHANGED) { 1148 dev_vdbg(&lp->spi->dev, "%s called for panc change\n", __func__); 1149 if (filt->pan_coord) 1150 at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 1); 1151 else 1152 at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 0); 1153 } 1154 1155 return 0; 1156 } 1157 1158 #define AT86RF23X_MAX_TX_POWERS 0xF 1159 static const s32 at86rf233_powers[AT86RF23X_MAX_TX_POWERS + 1] = { 1160 400, 370, 340, 300, 250, 200, 100, 0, -100, -200, -300, -400, -600, 1161 -800, -1200, -1700, 1162 }; 1163 1164 static const s32 at86rf231_powers[AT86RF23X_MAX_TX_POWERS + 1] = { 1165 300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700, 1166 -900, -1200, -1700, 1167 }; 1168 1169 #define AT86RF212_MAX_TX_POWERS 0x1F 1170 static const s32 at86rf212_powers[AT86RF212_MAX_TX_POWERS + 1] = { 1171 500, 400, 300, 200, 100, 0, -100, -200, -300, -400, -500, -600, -700, 1172 -800, -900, -1000, -1100, -1200, -1300, -1400, -1500, -1600, -1700, 1173 -1800, -1900, -2000, -2100, -2200, -2300, -2400, -2500, -2600, 1174 }; 1175 1176 static int 1177 at86rf23x_set_txpower(struct at86rf230_local *lp, s32 mbm) 1178 { 1179 u32 i; 1180 1181 for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) { 1182 if (lp->hw->phy->supported.tx_powers[i] == mbm) 1183 return at86rf230_write_subreg(lp, SR_TX_PWR_23X, i); 1184 } 1185 1186 return -EINVAL; 1187 } 1188 1189 static int 1190 at86rf212_set_txpower(struct at86rf230_local *lp, s32 mbm) 1191 { 1192 u32 i; 1193 1194 for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) { 1195 if (lp->hw->phy->supported.tx_powers[i] == mbm) 1196 return at86rf230_write_subreg(lp, SR_TX_PWR_212, i); 1197 } 1198 1199 return -EINVAL; 1200 } 1201 1202 static int 1203 at86rf230_set_txpower(struct ieee802154_hw *hw, s32 mbm) 1204 { 1205 struct at86rf230_local *lp = hw->priv; 1206 1207 return lp->data->set_txpower(lp, mbm); 1208 } 1209 1210 static int 1211 at86rf230_set_lbt(struct ieee802154_hw *hw, bool on) 1212 { 1213 struct at86rf230_local *lp = hw->priv; 1214 1215 return at86rf230_write_subreg(lp, SR_CSMA_LBT_MODE, on); 1216 } 1217 1218 static int 1219 at86rf230_set_cca_mode(struct ieee802154_hw *hw, 1220 const struct wpan_phy_cca *cca) 1221 { 1222 struct at86rf230_local *lp = hw->priv; 1223 u8 val; 1224 1225 /* mapping 802.15.4 to driver spec */ 1226 switch (cca->mode) { 1227 case NL802154_CCA_ENERGY: 1228 val = 1; 1229 break; 1230 case NL802154_CCA_CARRIER: 1231 val = 2; 1232 break; 1233 case NL802154_CCA_ENERGY_CARRIER: 1234 switch (cca->opt) { 1235 case NL802154_CCA_OPT_ENERGY_CARRIER_AND: 1236 val = 3; 1237 break; 1238 case NL802154_CCA_OPT_ENERGY_CARRIER_OR: 1239 val = 0; 1240 break; 1241 default: 1242 return -EINVAL; 1243 } 1244 break; 1245 default: 1246 return -EINVAL; 1247 } 1248 1249 return at86rf230_write_subreg(lp, SR_CCA_MODE, val); 1250 } 1251 1252 static int 1253 at86rf230_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm) 1254 { 1255 struct at86rf230_local *lp = hw->priv; 1256 u32 i; 1257 1258 for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) { 1259 if (hw->phy->supported.cca_ed_levels[i] == mbm) 1260 return at86rf230_write_subreg(lp, SR_CCA_ED_THRES, i); 1261 } 1262 1263 return -EINVAL; 1264 } 1265 1266 static int 1267 at86rf230_set_csma_params(struct ieee802154_hw *hw, u8 min_be, u8 max_be, 1268 u8 retries) 1269 { 1270 struct at86rf230_local *lp = hw->priv; 1271 int rc; 1272 1273 rc = at86rf230_write_subreg(lp, SR_MIN_BE, min_be); 1274 if (rc) 1275 return rc; 1276 1277 rc = at86rf230_write_subreg(lp, SR_MAX_BE, max_be); 1278 if (rc) 1279 return rc; 1280 1281 return at86rf230_write_subreg(lp, SR_MAX_CSMA_RETRIES, retries); 1282 } 1283 1284 static int 1285 at86rf230_set_frame_retries(struct ieee802154_hw *hw, s8 retries) 1286 { 1287 struct at86rf230_local *lp = hw->priv; 1288 1289 return at86rf230_write_subreg(lp, SR_MAX_FRAME_RETRIES, retries); 1290 } 1291 1292 static int 1293 at86rf230_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on) 1294 { 1295 struct at86rf230_local *lp = hw->priv; 1296 int rc; 1297 1298 if (on) { 1299 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 1); 1300 if (rc < 0) 1301 return rc; 1302 1303 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 1); 1304 if (rc < 0) 1305 return rc; 1306 } else { 1307 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 0); 1308 if (rc < 0) 1309 return rc; 1310 1311 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 0); 1312 if (rc < 0) 1313 return rc; 1314 } 1315 1316 return 0; 1317 } 1318 1319 static const struct ieee802154_ops at86rf230_ops = { 1320 .owner = THIS_MODULE, 1321 .xmit_async = at86rf230_xmit, 1322 .ed = at86rf230_ed, 1323 .set_channel = at86rf230_channel, 1324 .start = at86rf230_start, 1325 .stop = at86rf230_stop, 1326 .set_hw_addr_filt = at86rf230_set_hw_addr_filt, 1327 .set_txpower = at86rf230_set_txpower, 1328 .set_lbt = at86rf230_set_lbt, 1329 .set_cca_mode = at86rf230_set_cca_mode, 1330 .set_cca_ed_level = at86rf230_set_cca_ed_level, 1331 .set_csma_params = at86rf230_set_csma_params, 1332 .set_frame_retries = at86rf230_set_frame_retries, 1333 .set_promiscuous_mode = at86rf230_set_promiscuous_mode, 1334 }; 1335 1336 static struct at86rf2xx_chip_data at86rf233_data = { 1337 .t_sleep_cycle = 330, 1338 .t_channel_switch = 11, 1339 .t_reset_to_off = 26, 1340 .t_off_to_aack = 80, 1341 .t_off_to_tx_on = 80, 1342 .t_off_to_sleep = 35, 1343 .t_sleep_to_off = 1000, 1344 .t_frame = 4096, 1345 .t_p_ack = 545, 1346 .rssi_base_val = -94, 1347 .set_channel = at86rf23x_set_channel, 1348 .set_txpower = at86rf23x_set_txpower, 1349 }; 1350 1351 static struct at86rf2xx_chip_data at86rf231_data = { 1352 .t_sleep_cycle = 330, 1353 .t_channel_switch = 24, 1354 .t_reset_to_off = 37, 1355 .t_off_to_aack = 110, 1356 .t_off_to_tx_on = 110, 1357 .t_off_to_sleep = 35, 1358 .t_sleep_to_off = 1000, 1359 .t_frame = 4096, 1360 .t_p_ack = 545, 1361 .rssi_base_val = -91, 1362 .set_channel = at86rf23x_set_channel, 1363 .set_txpower = at86rf23x_set_txpower, 1364 }; 1365 1366 static struct at86rf2xx_chip_data at86rf212_data = { 1367 .t_sleep_cycle = 330, 1368 .t_channel_switch = 11, 1369 .t_reset_to_off = 26, 1370 .t_off_to_aack = 200, 1371 .t_off_to_tx_on = 200, 1372 .t_off_to_sleep = 35, 1373 .t_sleep_to_off = 1000, 1374 .t_frame = 4096, 1375 .t_p_ack = 545, 1376 .rssi_base_val = -100, 1377 .set_channel = at86rf212_set_channel, 1378 .set_txpower = at86rf212_set_txpower, 1379 }; 1380 1381 static int at86rf230_hw_init(struct at86rf230_local *lp, u8 xtal_trim) 1382 { 1383 int rc, irq_type, irq_pol = IRQ_ACTIVE_HIGH; 1384 unsigned int dvdd; 1385 u8 csma_seed[2]; 1386 1387 rc = at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF); 1388 if (rc) 1389 return rc; 1390 1391 irq_type = irq_get_trigger_type(lp->spi->irq); 1392 if (irq_type == IRQ_TYPE_EDGE_FALLING || 1393 irq_type == IRQ_TYPE_LEVEL_LOW) 1394 irq_pol = IRQ_ACTIVE_LOW; 1395 1396 rc = at86rf230_write_subreg(lp, SR_IRQ_POLARITY, irq_pol); 1397 if (rc) 1398 return rc; 1399 1400 rc = at86rf230_write_subreg(lp, SR_RX_SAFE_MODE, 1); 1401 if (rc) 1402 return rc; 1403 1404 rc = at86rf230_write_subreg(lp, SR_IRQ_MASK, IRQ_TRX_END); 1405 if (rc) 1406 return rc; 1407 1408 /* reset values differs in at86rf231 and at86rf233 */ 1409 rc = at86rf230_write_subreg(lp, SR_IRQ_MASK_MODE, 0); 1410 if (rc) 1411 return rc; 1412 1413 get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed)); 1414 rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]); 1415 if (rc) 1416 return rc; 1417 rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]); 1418 if (rc) 1419 return rc; 1420 1421 /* CLKM changes are applied immediately */ 1422 rc = at86rf230_write_subreg(lp, SR_CLKM_SHA_SEL, 0x00); 1423 if (rc) 1424 return rc; 1425 1426 /* Turn CLKM Off */ 1427 rc = at86rf230_write_subreg(lp, SR_CLKM_CTRL, 0x00); 1428 if (rc) 1429 return rc; 1430 /* Wait the next SLEEP cycle */ 1431 usleep_range(lp->data->t_sleep_cycle, 1432 lp->data->t_sleep_cycle + 100); 1433 1434 /* xtal_trim value is calculated by: 1435 * CL = 0.5 * (CX + CTRIM + CPAR) 1436 * 1437 * whereas: 1438 * CL = capacitor of used crystal 1439 * CX = connected capacitors at xtal pins 1440 * CPAR = in all at86rf2xx datasheets this is a constant value 3 pF, 1441 * but this is different on each board setup. You need to fine 1442 * tuning this value via CTRIM. 1443 * CTRIM = variable capacitor setting. Resolution is 0.3 pF range is 1444 * 0 pF upto 4.5 pF. 1445 * 1446 * Examples: 1447 * atben transceiver: 1448 * 1449 * CL = 8 pF 1450 * CX = 12 pF 1451 * CPAR = 3 pF (We assume the magic constant from datasheet) 1452 * CTRIM = 0.9 pF 1453 * 1454 * (12+0.9+3)/2 = 7.95 which is nearly at 8 pF 1455 * 1456 * xtal_trim = 0x3 1457 * 1458 * openlabs transceiver: 1459 * 1460 * CL = 16 pF 1461 * CX = 22 pF 1462 * CPAR = 3 pF (We assume the magic constant from datasheet) 1463 * CTRIM = 4.5 pF 1464 * 1465 * (22+4.5+3)/2 = 14.75 which is the nearest value to 16 pF 1466 * 1467 * xtal_trim = 0xf 1468 */ 1469 rc = at86rf230_write_subreg(lp, SR_XTAL_TRIM, xtal_trim); 1470 if (rc) 1471 return rc; 1472 1473 rc = at86rf230_read_subreg(lp, SR_DVDD_OK, &dvdd); 1474 if (rc) 1475 return rc; 1476 if (!dvdd) { 1477 dev_err(&lp->spi->dev, "DVDD error\n"); 1478 return -EINVAL; 1479 } 1480 1481 /* Force setting slotted operation bit to 0. Sometimes the atben 1482 * sets this bit and I don't know why. We set this always force 1483 * to zero while probing. 1484 */ 1485 return at86rf230_write_subreg(lp, SR_SLOTTED_OPERATION, 0); 1486 } 1487 1488 static int 1489 at86rf230_get_pdata(struct spi_device *spi, int *rstn, int *slp_tr, 1490 u8 *xtal_trim) 1491 { 1492 struct at86rf230_platform_data *pdata = spi->dev.platform_data; 1493 int ret; 1494 1495 if (!IS_ENABLED(CONFIG_OF) || !spi->dev.of_node) { 1496 if (!pdata) 1497 return -ENOENT; 1498 1499 *rstn = pdata->rstn; 1500 *slp_tr = pdata->slp_tr; 1501 *xtal_trim = pdata->xtal_trim; 1502 return 0; 1503 } 1504 1505 *rstn = of_get_named_gpio(spi->dev.of_node, "reset-gpio", 0); 1506 *slp_tr = of_get_named_gpio(spi->dev.of_node, "sleep-gpio", 0); 1507 ret = of_property_read_u8(spi->dev.of_node, "xtal-trim", xtal_trim); 1508 if (ret < 0 && ret != -EINVAL) 1509 return ret; 1510 1511 return 0; 1512 } 1513 1514 static int 1515 at86rf230_detect_device(struct at86rf230_local *lp) 1516 { 1517 unsigned int part, version, val; 1518 u16 man_id = 0; 1519 const char *chip; 1520 int rc; 1521 1522 rc = __at86rf230_read(lp, RG_MAN_ID_0, &val); 1523 if (rc) 1524 return rc; 1525 man_id |= val; 1526 1527 rc = __at86rf230_read(lp, RG_MAN_ID_1, &val); 1528 if (rc) 1529 return rc; 1530 man_id |= (val << 8); 1531 1532 rc = __at86rf230_read(lp, RG_PART_NUM, &part); 1533 if (rc) 1534 return rc; 1535 1536 rc = __at86rf230_read(lp, RG_VERSION_NUM, &version); 1537 if (rc) 1538 return rc; 1539 1540 if (man_id != 0x001f) { 1541 dev_err(&lp->spi->dev, "Non-Atmel dev found (MAN_ID %02x %02x)\n", 1542 man_id >> 8, man_id & 0xFF); 1543 return -EINVAL; 1544 } 1545 1546 lp->hw->flags = IEEE802154_HW_TX_OMIT_CKSUM | 1547 IEEE802154_HW_CSMA_PARAMS | 1548 IEEE802154_HW_FRAME_RETRIES | IEEE802154_HW_AFILT | 1549 IEEE802154_HW_PROMISCUOUS; 1550 1551 lp->hw->phy->flags = WPAN_PHY_FLAG_TXPOWER | 1552 WPAN_PHY_FLAG_CCA_ED_LEVEL | 1553 WPAN_PHY_FLAG_CCA_MODE; 1554 1555 lp->hw->phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY) | 1556 BIT(NL802154_CCA_CARRIER) | BIT(NL802154_CCA_ENERGY_CARRIER); 1557 lp->hw->phy->supported.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND) | 1558 BIT(NL802154_CCA_OPT_ENERGY_CARRIER_OR); 1559 1560 lp->hw->phy->cca.mode = NL802154_CCA_ENERGY; 1561 1562 switch (part) { 1563 case 2: 1564 chip = "at86rf230"; 1565 rc = -ENOTSUPP; 1566 goto not_supp; 1567 case 3: 1568 chip = "at86rf231"; 1569 lp->data = &at86rf231_data; 1570 lp->hw->phy->supported.channels[0] = 0x7FFF800; 1571 lp->hw->phy->current_channel = 11; 1572 lp->hw->phy->symbol_duration = 16; 1573 lp->hw->phy->supported.tx_powers = at86rf231_powers; 1574 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf231_powers); 1575 lp->hw->phy->supported.cca_ed_levels = at86rf231_ed_levels; 1576 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf231_ed_levels); 1577 break; 1578 case 7: 1579 chip = "at86rf212"; 1580 lp->data = &at86rf212_data; 1581 lp->hw->flags |= IEEE802154_HW_LBT; 1582 lp->hw->phy->supported.channels[0] = 0x00007FF; 1583 lp->hw->phy->supported.channels[2] = 0x00007FF; 1584 lp->hw->phy->current_channel = 5; 1585 lp->hw->phy->symbol_duration = 25; 1586 lp->hw->phy->supported.lbt = NL802154_SUPPORTED_BOOL_BOTH; 1587 lp->hw->phy->supported.tx_powers = at86rf212_powers; 1588 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf212_powers); 1589 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100; 1590 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100); 1591 break; 1592 case 11: 1593 chip = "at86rf233"; 1594 lp->data = &at86rf233_data; 1595 lp->hw->phy->supported.channels[0] = 0x7FFF800; 1596 lp->hw->phy->current_channel = 13; 1597 lp->hw->phy->symbol_duration = 16; 1598 lp->hw->phy->supported.tx_powers = at86rf233_powers; 1599 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf233_powers); 1600 lp->hw->phy->supported.cca_ed_levels = at86rf233_ed_levels; 1601 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf233_ed_levels); 1602 break; 1603 default: 1604 chip = "unknown"; 1605 rc = -ENOTSUPP; 1606 goto not_supp; 1607 } 1608 1609 lp->hw->phy->cca_ed_level = lp->hw->phy->supported.cca_ed_levels[7]; 1610 lp->hw->phy->transmit_power = lp->hw->phy->supported.tx_powers[0]; 1611 1612 not_supp: 1613 dev_info(&lp->spi->dev, "Detected %s chip version %d\n", chip, version); 1614 1615 return rc; 1616 } 1617 1618 #ifdef CONFIG_IEEE802154_AT86RF230_DEBUGFS 1619 static struct dentry *at86rf230_debugfs_root; 1620 1621 static int at86rf230_stats_show(struct seq_file *file, void *offset) 1622 { 1623 struct at86rf230_local *lp = file->private; 1624 1625 seq_printf(file, "SUCCESS:\t\t%8llu\n", lp->trac.success); 1626 seq_printf(file, "SUCCESS_DATA_PENDING:\t%8llu\n", 1627 lp->trac.success_data_pending); 1628 seq_printf(file, "SUCCESS_WAIT_FOR_ACK:\t%8llu\n", 1629 lp->trac.success_wait_for_ack); 1630 seq_printf(file, "CHANNEL_ACCESS_FAILURE:\t%8llu\n", 1631 lp->trac.channel_access_failure); 1632 seq_printf(file, "NO_ACK:\t\t\t%8llu\n", lp->trac.no_ack); 1633 seq_printf(file, "INVALID:\t\t%8llu\n", lp->trac.invalid); 1634 return 0; 1635 } 1636 DEFINE_SHOW_ATTRIBUTE(at86rf230_stats); 1637 1638 static void at86rf230_debugfs_init(struct at86rf230_local *lp) 1639 { 1640 char debugfs_dir_name[DNAME_INLINE_LEN + 1] = "at86rf230-"; 1641 1642 strncat(debugfs_dir_name, dev_name(&lp->spi->dev), DNAME_INLINE_LEN); 1643 1644 at86rf230_debugfs_root = debugfs_create_dir(debugfs_dir_name, NULL); 1645 1646 debugfs_create_file("trac_stats", 0444, at86rf230_debugfs_root, lp, 1647 &at86rf230_stats_fops); 1648 } 1649 1650 static void at86rf230_debugfs_remove(void) 1651 { 1652 debugfs_remove_recursive(at86rf230_debugfs_root); 1653 } 1654 #else 1655 static void at86rf230_debugfs_init(struct at86rf230_local *lp) { } 1656 static void at86rf230_debugfs_remove(void) { } 1657 #endif 1658 1659 static int at86rf230_probe(struct spi_device *spi) 1660 { 1661 struct ieee802154_hw *hw; 1662 struct at86rf230_local *lp; 1663 unsigned int status; 1664 int rc, irq_type, rstn, slp_tr; 1665 u8 xtal_trim = 0; 1666 1667 if (!spi->irq) { 1668 dev_err(&spi->dev, "no IRQ specified\n"); 1669 return -EINVAL; 1670 } 1671 1672 rc = at86rf230_get_pdata(spi, &rstn, &slp_tr, &xtal_trim); 1673 if (rc < 0) { 1674 dev_err(&spi->dev, "failed to parse platform_data: %d\n", rc); 1675 return rc; 1676 } 1677 1678 if (gpio_is_valid(rstn)) { 1679 rc = devm_gpio_request_one(&spi->dev, rstn, 1680 GPIOF_OUT_INIT_HIGH, "rstn"); 1681 if (rc) 1682 return rc; 1683 } 1684 1685 if (gpio_is_valid(slp_tr)) { 1686 rc = devm_gpio_request_one(&spi->dev, slp_tr, 1687 GPIOF_OUT_INIT_LOW, "slp_tr"); 1688 if (rc) 1689 return rc; 1690 } 1691 1692 /* Reset */ 1693 if (gpio_is_valid(rstn)) { 1694 udelay(1); 1695 gpio_set_value_cansleep(rstn, 0); 1696 udelay(1); 1697 gpio_set_value_cansleep(rstn, 1); 1698 usleep_range(120, 240); 1699 } 1700 1701 hw = ieee802154_alloc_hw(sizeof(*lp), &at86rf230_ops); 1702 if (!hw) 1703 return -ENOMEM; 1704 1705 lp = hw->priv; 1706 lp->hw = hw; 1707 lp->spi = spi; 1708 lp->slp_tr = slp_tr; 1709 hw->parent = &spi->dev; 1710 ieee802154_random_extended_addr(&hw->phy->perm_extended_addr); 1711 1712 lp->regmap = devm_regmap_init_spi(spi, &at86rf230_regmap_spi_config); 1713 if (IS_ERR(lp->regmap)) { 1714 rc = PTR_ERR(lp->regmap); 1715 dev_err(&spi->dev, "Failed to allocate register map: %d\n", 1716 rc); 1717 goto free_dev; 1718 } 1719 1720 at86rf230_setup_spi_messages(lp, &lp->state); 1721 at86rf230_setup_spi_messages(lp, &lp->tx); 1722 1723 rc = at86rf230_detect_device(lp); 1724 if (rc < 0) 1725 goto free_dev; 1726 1727 init_completion(&lp->state_complete); 1728 1729 spi_set_drvdata(spi, lp); 1730 1731 rc = at86rf230_hw_init(lp, xtal_trim); 1732 if (rc) 1733 goto free_dev; 1734 1735 /* Read irq status register to reset irq line */ 1736 rc = at86rf230_read_subreg(lp, RG_IRQ_STATUS, 0xff, 0, &status); 1737 if (rc) 1738 goto free_dev; 1739 1740 irq_type = irq_get_trigger_type(spi->irq); 1741 if (!irq_type) 1742 irq_type = IRQF_TRIGGER_HIGH; 1743 1744 rc = devm_request_irq(&spi->dev, spi->irq, at86rf230_isr, 1745 IRQF_SHARED | irq_type, dev_name(&spi->dev), lp); 1746 if (rc) 1747 goto free_dev; 1748 1749 /* disable_irq by default and wait for starting hardware */ 1750 disable_irq(spi->irq); 1751 1752 /* going into sleep by default */ 1753 at86rf230_sleep(lp); 1754 1755 at86rf230_debugfs_init(lp); 1756 1757 rc = ieee802154_register_hw(lp->hw); 1758 if (rc) 1759 goto free_debugfs; 1760 1761 return rc; 1762 1763 free_debugfs: 1764 at86rf230_debugfs_remove(); 1765 free_dev: 1766 ieee802154_free_hw(lp->hw); 1767 1768 return rc; 1769 } 1770 1771 static int at86rf230_remove(struct spi_device *spi) 1772 { 1773 struct at86rf230_local *lp = spi_get_drvdata(spi); 1774 1775 /* mask all at86rf230 irq's */ 1776 at86rf230_write_subreg(lp, SR_IRQ_MASK, 0); 1777 ieee802154_unregister_hw(lp->hw); 1778 ieee802154_free_hw(lp->hw); 1779 at86rf230_debugfs_remove(); 1780 dev_dbg(&spi->dev, "unregistered at86rf230\n"); 1781 1782 return 0; 1783 } 1784 1785 static const struct of_device_id at86rf230_of_match[] = { 1786 { .compatible = "atmel,at86rf230", }, 1787 { .compatible = "atmel,at86rf231", }, 1788 { .compatible = "atmel,at86rf233", }, 1789 { .compatible = "atmel,at86rf212", }, 1790 { }, 1791 }; 1792 MODULE_DEVICE_TABLE(of, at86rf230_of_match); 1793 1794 static const struct spi_device_id at86rf230_device_id[] = { 1795 { .name = "at86rf230", }, 1796 { .name = "at86rf231", }, 1797 { .name = "at86rf233", }, 1798 { .name = "at86rf212", }, 1799 { }, 1800 }; 1801 MODULE_DEVICE_TABLE(spi, at86rf230_device_id); 1802 1803 static struct spi_driver at86rf230_driver = { 1804 .id_table = at86rf230_device_id, 1805 .driver = { 1806 .of_match_table = of_match_ptr(at86rf230_of_match), 1807 .name = "at86rf230", 1808 }, 1809 .probe = at86rf230_probe, 1810 .remove = at86rf230_remove, 1811 }; 1812 1813 module_spi_driver(at86rf230_driver); 1814 1815 MODULE_DESCRIPTION("AT86RF230 Transceiver Driver"); 1816 MODULE_LICENSE("GPL v2"); 1817