drivers/net/ieee802154/at86rf230.c

   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         u8 tx_retry;
 104         struct sk_buff *tx_skb;
 105         struct at86rf230_state_change tx;
 106
 107         struct at86rf230_trac trac;
 108 };
 109
 110 #define AT86RF2XX_NUMREGS 0x3F
 111
 112 static void
 113 at86rf230_async_state_change(struct at86rf230_local *lp,
 114                              struct at86rf230_state_change *ctx,
 115                              const u8 state, void (*complete)(void *context));
 116
 117 static inline void
 118 at86rf230_sleep(struct at86rf230_local *lp)
 119 {
 120         if (gpio_is_valid(lp->slp_tr)) {
 121                 gpio_set_value(lp->slp_tr, 1);
 122                 usleep_range(lp->data->t_off_to_sleep,
 123                              lp->data->t_off_to_sleep + 10);
 124                 lp->sleep = true;
 125         }
 126 }
 127
 128 static inline void
 129 at86rf230_awake(struct at86rf230_local *lp)
 130 {
 131         if (gpio_is_valid(lp->slp_tr)) {
 132                 gpio_set_value(lp->slp_tr, 0);
 133                 usleep_range(lp->data->t_sleep_to_off,
 134                              lp->data->t_sleep_to_off + 100);
 135                 lp->sleep = false;
 136         }
 137 }
 138
 139 static inline int
 140 __at86rf230_write(struct at86rf230_local *lp,
 141                   unsigned int addr, unsigned int data)
 142 {
 143         bool sleep = lp->sleep;
 144         int ret;
 145
 146         /* awake for register setting if sleep */
 147         if (sleep)
 148                 at86rf230_awake(lp);
 149
 150         ret = regmap_write(lp->regmap, addr, data);
 151
 152         /* sleep again if was sleeping */
 153         if (sleep)
 154                 at86rf230_sleep(lp);
 155
 156         return ret;
 157 }
 158
 159 static inline int
 160 __at86rf230_read(struct at86rf230_local *lp,
 161                  unsigned int addr, unsigned int *data)
 162 {
 163         bool sleep = lp->sleep;
 164         int ret;
 165
 166         /* awake for register setting if sleep */
 167         if (sleep)
 168                 at86rf230_awake(lp);
 169
 170         ret = regmap_read(lp->regmap, addr, data);
 171
 172         /* sleep again if was sleeping */
 173         if (sleep)
 174                 at86rf230_sleep(lp);
 175
 176         return ret;
 177 }
 178
 179 static inline int
 180 at86rf230_read_subreg(struct at86rf230_local *lp,
 181                       unsigned int addr, unsigned int mask,
 182                       unsigned int shift, unsigned int *data)
 183 {
 184         int rc;
 185
 186         rc = __at86rf230_read(lp, addr, data);
 187         if (!rc)
 188                 *data = (*data & mask) >> shift;
 189
 190         return rc;
 191 }
 192
 193 static inline int
 194 at86rf230_write_subreg(struct at86rf230_local *lp,
 195                        unsigned int addr, unsigned int mask,
 196                        unsigned int shift, unsigned int data)
 197 {
 198         bool sleep = lp->sleep;
 199         int ret;
 200
 201         /* awake for register setting if sleep */
 202         if (sleep)
 203                 at86rf230_awake(lp);
 204
 205         ret = regmap_update_bits(lp->regmap, addr, mask, data << shift);
 206
 207         /* sleep again if was sleeping */
 208         if (sleep)
 209                 at86rf230_sleep(lp);
 210
 211         return ret;
 212 }
 213
 214 static inline void
 215 at86rf230_slp_tr_rising_edge(struct at86rf230_local *lp)
 216 {
 217         gpio_set_value(lp->slp_tr, 1);
 218         udelay(1);
 219         gpio_set_value(lp->slp_tr, 0);
 220 }
 221
 222 static bool
 223 at86rf230_reg_writeable(struct device *dev, unsigned int reg)
 224 {
 225         switch (reg) {
 226         case RG_TRX_STATE:
 227         case RG_TRX_CTRL_0:
 228         case RG_TRX_CTRL_1:
 229         case RG_PHY_TX_PWR:
 230         case RG_PHY_ED_LEVEL:
 231         case RG_PHY_CC_CCA:
 232         case RG_CCA_THRES:
 233         case RG_RX_CTRL:
 234         case RG_SFD_VALUE:
 235         case RG_TRX_CTRL_2:
 236         case RG_ANT_DIV:
 237         case RG_IRQ_MASK:
 238         case RG_VREG_CTRL:
 239         case RG_BATMON:
 240         case RG_XOSC_CTRL:
 241         case RG_RX_SYN:
 242         case RG_XAH_CTRL_1:
 243         case RG_FTN_CTRL:
 244         case RG_PLL_CF:
 245         case RG_PLL_DCU:
 246         case RG_SHORT_ADDR_0:
 247         case RG_SHORT_ADDR_1:
 248         case RG_PAN_ID_0:
 249         case RG_PAN_ID_1:
 250         case RG_IEEE_ADDR_0:
 251         case RG_IEEE_ADDR_1:
 252         case RG_IEEE_ADDR_2:
 253         case RG_IEEE_ADDR_3:
 254         case RG_IEEE_ADDR_4:
 255         case RG_IEEE_ADDR_5:
 256         case RG_IEEE_ADDR_6:
 257         case RG_IEEE_ADDR_7:
 258         case RG_XAH_CTRL_0:
 259         case RG_CSMA_SEED_0:
 260         case RG_CSMA_SEED_1:
 261         case RG_CSMA_BE:
 262                 return true;
 263         default:
 264                 return false;
 265         }
 266 }
 267
 268 static bool
 269 at86rf230_reg_readable(struct device *dev, unsigned int reg)
 270 {
 271         bool rc;
 272
 273         /* all writeable are also readable */
 274         rc = at86rf230_reg_writeable(dev, reg);
 275         if (rc)
 276                 return rc;
 277
 278         /* readonly regs */
 279         switch (reg) {
 280         case RG_TRX_STATUS:
 281         case RG_PHY_RSSI:
 282         case RG_IRQ_STATUS:
 283         case RG_PART_NUM:
 284         case RG_VERSION_NUM:
 285         case RG_MAN_ID_1:
 286         case RG_MAN_ID_0:
 287                 return true;
 288         default:
 289                 return false;
 290         }
 291 }
 292
 293 static bool
 294 at86rf230_reg_volatile(struct device *dev, unsigned int reg)
 295 {
 296         /* can be changed during runtime */
 297         switch (reg) {
 298         case RG_TRX_STATUS:
 299         case RG_TRX_STATE:
 300         case RG_PHY_RSSI:
 301         case RG_PHY_ED_LEVEL:
 302         case RG_IRQ_STATUS:
 303         case RG_VREG_CTRL:
 304         case RG_PLL_CF:
 305         case RG_PLL_DCU:
 306                 return true;
 307         default:
 308                 return false;
 309         }
 310 }
 311
 312 static bool
 313 at86rf230_reg_precious(struct device *dev, unsigned int reg)
 314 {
 315         /* don't clear irq line on read */
 316         switch (reg) {
 317         case RG_IRQ_STATUS:
 318                 return true;
 319         default:
 320                 return false;
 321         }
 322 }
 323
 324 static const struct regmap_config at86rf230_regmap_spi_config = {
 325         .reg_bits = 8,
 326         .val_bits = 8,
 327         .write_flag_mask = CMD_REG | CMD_WRITE,
 328         .read_flag_mask = CMD_REG,
 329         .cache_type = REGCACHE_RBTREE,
 330         .max_register = AT86RF2XX_NUMREGS,
 331         .writeable_reg = at86rf230_reg_writeable,
 332         .readable_reg = at86rf230_reg_readable,
 333         .volatile_reg = at86rf230_reg_volatile,
 334         .precious_reg = at86rf230_reg_precious,
 335 };
 336
 337 static void
 338 at86rf230_async_error_recover_complete(void *context)
 339 {
 340         struct at86rf230_state_change *ctx = context;
 341         struct at86rf230_local *lp = ctx->lp;
 342
 343         if (ctx->free)
 344                 kfree(ctx);
 345
 346         ieee802154_wake_queue(lp->hw);
 347 }
 348
 349 static void
 350 at86rf230_async_error_recover(void *context)
 351 {
 352         struct at86rf230_state_change *ctx = context;
 353         struct at86rf230_local *lp = ctx->lp;
 354
 355         lp->is_tx = 0;
 356         at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON,
 357                                      at86rf230_async_error_recover_complete);
 358 }
 359
 360 static inline void
 361 at86rf230_async_error(struct at86rf230_local *lp,
 362                       struct at86rf230_state_change *ctx, int rc)
 363 {
 364         dev_err(&lp->spi->dev, "spi_async error %d\n", rc);
 365
 366         at86rf230_async_state_change(lp, ctx, STATE_FORCE_TRX_OFF,
 367                                      at86rf230_async_error_recover);
 368 }
 369
 370 /* Generic function to get some register value in async mode */
 371 static void
 372 at86rf230_async_read_reg(struct at86rf230_local *lp, u8 reg,
 373                          struct at86rf230_state_change *ctx,
 374                          void (*complete)(void *context))
 375 {
 376         int rc;
 377
 378         u8 *tx_buf = ctx->buf;
 379
 380         tx_buf[0] = (reg & CMD_REG_MASK) | CMD_REG;
 381         ctx->msg.complete = complete;
 382         rc = spi_async(lp->spi, &ctx->msg);
 383         if (rc)
 384                 at86rf230_async_error(lp, ctx, rc);
 385 }
 386
 387 static void
 388 at86rf230_async_write_reg(struct at86rf230_local *lp, u8 reg, u8 val,
 389                           struct at86rf230_state_change *ctx,
 390                           void (*complete)(void *context))
 391 {
 392         int rc;
 393
 394         ctx->buf[0] = (reg & CMD_REG_MASK) | CMD_REG | CMD_WRITE;
 395         ctx->buf[1] = val;
 396         ctx->msg.complete = complete;
 397         rc = spi_async(lp->spi, &ctx->msg);
 398         if (rc)
 399                 at86rf230_async_error(lp, ctx, rc);
 400 }
 401
 402 static void
 403 at86rf230_async_state_assert(void *context)
 404 {
 405         struct at86rf230_state_change *ctx = context;
 406         struct at86rf230_local *lp = ctx->lp;
 407         const u8 *buf = ctx->buf;
 408         const u8 trx_state = buf[1] & TRX_STATE_MASK;
 409
 410         /* Assert state change */
 411         if (trx_state != ctx->to_state) {
 412                 /* Special handling if transceiver state is in
 413                  * STATE_BUSY_RX_AACK and a SHR was detected.
 414                  */
 415                 if  (trx_state == STATE_BUSY_RX_AACK) {
 416                         /* Undocumented race condition. If we send a state
 417                          * change to STATE_RX_AACK_ON the transceiver could
 418                          * change his state automatically to STATE_BUSY_RX_AACK
 419                          * if a SHR was detected. This is not an error, but we
 420                          * can't assert this.
 421                          */
 422                         if (ctx->to_state == STATE_RX_AACK_ON)
 423                                 goto done;
 424
 425                         /* If we change to STATE_TX_ON without forcing and
 426                          * transceiver state is STATE_BUSY_RX_AACK, we wait
 427                          * 'tFrame + tPAck' receiving time. In this time the
 428                          * PDU should be received. If the transceiver is still
 429                          * in STATE_BUSY_RX_AACK, we run a force state change
 430                          * to STATE_TX_ON. This is a timeout handling, if the
 431                          * transceiver stucks in STATE_BUSY_RX_AACK.
 432                          *
 433                          * Additional we do several retries to try to get into
 434                          * TX_ON state without forcing. If the retries are
 435                          * higher or equal than AT86RF2XX_MAX_TX_RETRIES we
 436                          * will do a force change.
 437                          */
 438                         if (ctx->to_state == STATE_TX_ON ||
 439                             ctx->to_state == STATE_TRX_OFF) {
 440                                 u8 state = ctx->to_state;
 441
 442                                 if (lp->tx_retry >= AT86RF2XX_MAX_TX_RETRIES)
 443                                         state = STATE_FORCE_TRX_OFF;
 444                                 lp->tx_retry++;
 445
 446                                 at86rf230_async_state_change(lp, ctx, state,
 447                                                              ctx->complete);
 448                                 return;
 449                         }
 450                 }
 451
 452                 dev_warn(&lp->spi->dev, "unexcept state change from 0x%02x to 0x%02x. Actual state: 0x%02x\n",
 453                          ctx->from_state, ctx->to_state, trx_state);
 454         }
 455
 456 done:
 457         if (ctx->complete)
 458                 ctx->complete(context);
 459 }
 460
 461 static enum hrtimer_restart at86rf230_async_state_timer(struct hrtimer *timer)
 462 {
 463         struct at86rf230_state_change *ctx =
 464                 container_of(timer, struct at86rf230_state_change, timer);
 465         struct at86rf230_local *lp = ctx->lp;
 466
 467         at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 468                                  at86rf230_async_state_assert);
 469
 470         return HRTIMER_NORESTART;
 471 }
 472
 473 /* Do state change timing delay. */
 474 static void
 475 at86rf230_async_state_delay(void *context)
 476 {
 477         struct at86rf230_state_change *ctx = context;
 478         struct at86rf230_local *lp = ctx->lp;
 479         struct at86rf2xx_chip_data *c = lp->data;
 480         bool force = false;
 481         ktime_t tim;
 482
 483         /* The force state changes are will show as normal states in the
 484          * state status subregister. We change the to_state to the
 485          * corresponding one and remember if it was a force change, this
 486          * differs if we do a state change from STATE_BUSY_RX_AACK.
 487          */
 488         switch (ctx->to_state) {
 489         case STATE_FORCE_TX_ON:
 490                 ctx->to_state = STATE_TX_ON;
 491                 force = true;
 492                 break;
 493         case STATE_FORCE_TRX_OFF:
 494                 ctx->to_state = STATE_TRX_OFF;
 495                 force = true;
 496                 break;
 497         default:
 498                 break;
 499         }
 500
 501         switch (ctx->from_state) {
 502         case STATE_TRX_OFF:
 503                 switch (ctx->to_state) {
 504                 case STATE_RX_AACK_ON:
 505                         tim = c->t_off_to_aack * NSEC_PER_USEC;
 506                         /* state change from TRX_OFF to RX_AACK_ON to do a
 507                          * calibration, we need to reset the timeout for the
 508                          * next one.
 509                          */
 510                         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
 511                         goto change;
 512                 case STATE_TX_ARET_ON:
 513                 case STATE_TX_ON:
 514                         tim = c->t_off_to_tx_on * NSEC_PER_USEC;
 515                         /* state change from TRX_OFF to TX_ON or ARET_ON to do
 516                          * a 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                 default:
 522                         break;
 523                 }
 524                 break;
 525         case STATE_BUSY_RX_AACK:
 526                 switch (ctx->to_state) {
 527                 case STATE_TRX_OFF:
 528                 case STATE_TX_ON:
 529                         /* Wait for worst case receiving time if we
 530                          * didn't make a force change from BUSY_RX_AACK
 531                          * to TX_ON or TRX_OFF.
 532                          */
 533                         if (!force) {
 534                                 tim = (c->t_frame + c->t_p_ack) * NSEC_PER_USEC;
 535                                 goto change;
 536                         }
 537                         break;
 538                 default:
 539                         break;
 540                 }
 541                 break;
 542         /* Default value, means RESET state */
 543         case STATE_P_ON:
 544                 switch (ctx->to_state) {
 545                 case STATE_TRX_OFF:
 546                         tim = c->t_reset_to_off * NSEC_PER_USEC;
 547                         goto change;
 548                 default:
 549                         break;
 550                 }
 551                 break;
 552         default:
 553                 break;
 554         }
 555
 556         /* Default delay is 1us in the most cases */
 557         udelay(1);
 558         at86rf230_async_state_timer(&ctx->timer);
 559         return;
 560
 561 change:
 562         hrtimer_start(&ctx->timer, tim, HRTIMER_MODE_REL);
 563 }
 564
 565 static void
 566 at86rf230_async_state_change_start(void *context)
 567 {
 568         struct at86rf230_state_change *ctx = context;
 569         struct at86rf230_local *lp = ctx->lp;
 570         u8 *buf = ctx->buf;
 571         const u8 trx_state = buf[1] & TRX_STATE_MASK;
 572
 573         /* Check for "possible" STATE_TRANSITION_IN_PROGRESS */
 574         if (trx_state == STATE_TRANSITION_IN_PROGRESS) {
 575                 udelay(1);
 576                 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 577                                          at86rf230_async_state_change_start);
 578                 return;
 579         }
 580
 581         /* Check if we already are in the state which we change in */
 582         if (trx_state == ctx->to_state) {
 583                 if (ctx->complete)
 584                         ctx->complete(context);
 585                 return;
 586         }
 587
 588         /* Set current state to the context of state change */
 589         ctx->from_state = trx_state;
 590
 591         /* Going into the next step for a state change which do a timing
 592          * relevant delay.
 593          */
 594         at86rf230_async_write_reg(lp, RG_TRX_STATE, ctx->to_state, ctx,
 595                                   at86rf230_async_state_delay);
 596 }
 597
 598 static void
 599 at86rf230_async_state_change(struct at86rf230_local *lp,
 600                              struct at86rf230_state_change *ctx,
 601                              const u8 state, void (*complete)(void *context))
 602 {
 603         /* Initialization for the state change context */
 604         ctx->to_state = state;
 605         ctx->complete = complete;
 606         at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 607                                  at86rf230_async_state_change_start);
 608 }
 609
 610 static void
 611 at86rf230_sync_state_change_complete(void *context)
 612 {
 613         struct at86rf230_state_change *ctx = context;
 614         struct at86rf230_local *lp = ctx->lp;
 615
 616         complete(&lp->state_complete);
 617 }
 618
 619 /* This function do a sync framework above the async state change.
 620  * Some callbacks of the IEEE 802.15.4 driver interface need to be
 621  * handled synchronously.
 622  */
 623 static int
 624 at86rf230_sync_state_change(struct at86rf230_local *lp, unsigned int state)
 625 {
 626         unsigned long rc;
 627
 628         at86rf230_async_state_change(lp, &lp->state, state,
 629                                      at86rf230_sync_state_change_complete);
 630
 631         rc = wait_for_completion_timeout(&lp->state_complete,
 632                                          msecs_to_jiffies(100));
 633         if (!rc) {
 634                 at86rf230_async_error(lp, &lp->state, -ETIMEDOUT);
 635                 return -ETIMEDOUT;
 636         }
 637
 638         return 0;
 639 }
 640
 641 static void
 642 at86rf230_tx_complete(void *context)
 643 {
 644         struct at86rf230_state_change *ctx = context;
 645         struct at86rf230_local *lp = ctx->lp;
 646
 647         ieee802154_xmit_complete(lp->hw, lp->tx_skb, false);
 648         kfree(ctx);
 649 }
 650
 651 static void
 652 at86rf230_tx_on(void *context)
 653 {
 654         struct at86rf230_state_change *ctx = context;
 655         struct at86rf230_local *lp = ctx->lp;
 656
 657         at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON,
 658                                      at86rf230_tx_complete);
 659 }
 660
 661 static void
 662 at86rf230_tx_trac_check(void *context)
 663 {
 664         struct at86rf230_state_change *ctx = context;
 665         struct at86rf230_local *lp = ctx->lp;
 666
 667         if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS)) {
 668                 u8 trac = TRAC_MASK(ctx->buf[1]);
 669
 670                 switch (trac) {
 671                 case TRAC_SUCCESS:
 672                         lp->trac.success++;
 673                         break;
 674                 case TRAC_SUCCESS_DATA_PENDING:
 675                         lp->trac.success_data_pending++;
 676                         break;
 677                 case TRAC_CHANNEL_ACCESS_FAILURE:
 678                         lp->trac.channel_access_failure++;
 679                         break;
 680                 case TRAC_NO_ACK:
 681                         lp->trac.no_ack++;
 682                         break;
 683                 case TRAC_INVALID:
 684                         lp->trac.invalid++;
 685                         break;
 686                 default:
 687                         WARN_ONCE(1, "received tx trac status %d\n", trac);
 688                         break;
 689                 }
 690         }
 691
 692         at86rf230_async_state_change(lp, ctx, STATE_TX_ON, at86rf230_tx_on);
 693 }
 694
 695 static void
 696 at86rf230_rx_read_frame_complete(void *context)
 697 {
 698         struct at86rf230_state_change *ctx = context;
 699         struct at86rf230_local *lp = ctx->lp;
 700         const u8 *buf = ctx->buf;
 701         struct sk_buff *skb;
 702         u8 len, lqi;
 703
 704         len = buf[1];
 705         if (!ieee802154_is_valid_psdu_len(len)) {
 706                 dev_vdbg(&lp->spi->dev, "corrupted frame received\n");
 707                 len = IEEE802154_MTU;
 708         }
 709         lqi = buf[2 + len];
 710
 711         skb = dev_alloc_skb(IEEE802154_MTU);
 712         if (!skb) {
 713                 dev_vdbg(&lp->spi->dev, "failed to allocate sk_buff\n");
 714                 kfree(ctx);
 715                 return;
 716         }
 717
 718         skb_put_data(skb, buf + 2, len);
 719         ieee802154_rx_irqsafe(lp->hw, skb, lqi);
 720         kfree(ctx);
 721 }
 722
 723 static void
 724 at86rf230_rx_trac_check(void *context)
 725 {
 726         struct at86rf230_state_change *ctx = context;
 727         struct at86rf230_local *lp = ctx->lp;
 728         u8 *buf = ctx->buf;
 729         int rc;
 730
 731         if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS)) {
 732                 u8 trac = TRAC_MASK(buf[1]);
 733
 734                 switch (trac) {
 735                 case TRAC_SUCCESS:
 736                         lp->trac.success++;
 737                         break;
 738                 case TRAC_SUCCESS_WAIT_FOR_ACK:
 739                         lp->trac.success_wait_for_ack++;
 740                         break;
 741                 case TRAC_INVALID:
 742                         lp->trac.invalid++;
 743                         break;
 744                 default:
 745                         WARN_ONCE(1, "received rx trac status %d\n", trac);
 746                         break;
 747                 }
 748         }
 749
 750         buf[0] = CMD_FB;
 751         ctx->trx.len = AT86RF2XX_MAX_BUF;
 752         ctx->msg.complete = at86rf230_rx_read_frame_complete;
 753         rc = spi_async(lp->spi, &ctx->msg);
 754         if (rc) {
 755                 ctx->trx.len = 2;
 756                 at86rf230_async_error(lp, ctx, rc);
 757         }
 758 }
 759
 760 static void
 761 at86rf230_irq_trx_end(void *context)
 762 {
 763         struct at86rf230_state_change *ctx = context;
 764         struct at86rf230_local *lp = ctx->lp;
 765
 766         if (lp->is_tx) {
 767                 lp->is_tx = 0;
 768                 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx,
 769                                          at86rf230_tx_trac_check);
 770         } else {
 771                 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx,
 772                                          at86rf230_rx_trac_check);
 773         }
 774 }
 775
 776 static void
 777 at86rf230_irq_status(void *context)
 778 {
 779         struct at86rf230_state_change *ctx = context;
 780         struct at86rf230_local *lp = ctx->lp;
 781         const u8 *buf = ctx->buf;
 782         u8 irq = buf[1];
 783
 784         enable_irq(lp->spi->irq);
 785
 786         if (irq & IRQ_TRX_END) {
 787                 at86rf230_irq_trx_end(ctx);
 788         } else {
 789                 dev_err(&lp->spi->dev, "not supported irq %02x received\n",
 790                         irq);
 791                 kfree(ctx);
 792         }
 793 }
 794
 795 static void
 796 at86rf230_setup_spi_messages(struct at86rf230_local *lp,
 797                              struct at86rf230_state_change *state)
 798 {
 799         state->lp = lp;
 800         state->irq = lp->spi->irq;
 801         spi_message_init(&state->msg);
 802         state->msg.context = state;
 803         state->trx.len = 2;
 804         state->trx.tx_buf = state->buf;
 805         state->trx.rx_buf = state->buf;
 806         spi_message_add_tail(&state->trx, &state->msg);
 807         hrtimer_init(&state->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 808         state->timer.function = at86rf230_async_state_timer;
 809 }
 810
 811 static irqreturn_t at86rf230_isr(int irq, void *data)
 812 {
 813         struct at86rf230_local *lp = data;
 814         struct at86rf230_state_change *ctx;
 815         int rc;
 816
 817         disable_irq_nosync(irq);
 818
 819         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 820         if (!ctx) {
 821                 enable_irq(irq);
 822                 return IRQ_NONE;
 823         }
 824
 825         at86rf230_setup_spi_messages(lp, ctx);
 826         /* tell on error handling to free ctx */
 827         ctx->free = true;
 828
 829         ctx->buf[0] = (RG_IRQ_STATUS & CMD_REG_MASK) | CMD_REG;
 830         ctx->msg.complete = at86rf230_irq_status;
 831         rc = spi_async(lp->spi, &ctx->msg);
 832         if (rc) {
 833                 at86rf230_async_error(lp, ctx, rc);
 834                 enable_irq(irq);
 835                 return IRQ_NONE;
 836         }
 837
 838         return IRQ_HANDLED;
 839 }
 840
 841 static void
 842 at86rf230_write_frame_complete(void *context)
 843 {
 844         struct at86rf230_state_change *ctx = context;
 845         struct at86rf230_local *lp = ctx->lp;
 846
 847         ctx->trx.len = 2;
 848
 849         if (gpio_is_valid(lp->slp_tr))
 850                 at86rf230_slp_tr_rising_edge(lp);
 851         else
 852                 at86rf230_async_write_reg(lp, RG_TRX_STATE, STATE_BUSY_TX, ctx,
 853                                           NULL);
 854 }
 855
 856 static void
 857 at86rf230_write_frame(void *context)
 858 {
 859         struct at86rf230_state_change *ctx = context;
 860         struct at86rf230_local *lp = ctx->lp;
 861         struct sk_buff *skb = lp->tx_skb;
 862         u8 *buf = ctx->buf;
 863         int rc;
 864
 865         lp->is_tx = 1;
 866
 867         buf[0] = CMD_FB | CMD_WRITE;
 868         buf[1] = skb->len + 2;
 869         memcpy(buf + 2, skb->data, skb->len);
 870         ctx->trx.len = skb->len + 2;
 871         ctx->msg.complete = at86rf230_write_frame_complete;
 872         rc = spi_async(lp->spi, &ctx->msg);
 873         if (rc) {
 874                 ctx->trx.len = 2;
 875                 at86rf230_async_error(lp, ctx, rc);
 876         }
 877 }
 878
 879 static void
 880 at86rf230_xmit_tx_on(void *context)
 881 {
 882         struct at86rf230_state_change *ctx = context;
 883         struct at86rf230_local *lp = ctx->lp;
 884
 885         at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
 886                                      at86rf230_write_frame);
 887 }
 888
 889 static void
 890 at86rf230_xmit_start(void *context)
 891 {
 892         struct at86rf230_state_change *ctx = context;
 893         struct at86rf230_local *lp = ctx->lp;
 894
 895         /* check if we change from off state */
 896         if (lp->is_tx_from_off)
 897                 at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
 898                                              at86rf230_write_frame);
 899         else
 900                 at86rf230_async_state_change(lp, ctx, STATE_TX_ON,
 901                                              at86rf230_xmit_tx_on);
 902 }
 903
 904 static int
 905 at86rf230_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
 906 {
 907         struct at86rf230_local *lp = hw->priv;
 908         struct at86rf230_state_change *ctx = &lp->tx;
 909
 910         lp->tx_skb = skb;
 911         lp->tx_retry = 0;
 912
 913         /* After 5 minutes in PLL and the same frequency we run again the
 914          * calibration loops which is recommended by at86rf2xx datasheets.
 915          *
 916          * The calibration is initiate by a state change from TRX_OFF
 917          * to TX_ON, the lp->cal_timeout should be reinit by state_delay
 918          * function then to start in the next 5 minutes.
 919          */
 920         if (time_is_before_jiffies(lp->cal_timeout)) {
 921                 lp->is_tx_from_off = true;
 922                 at86rf230_async_state_change(lp, ctx, STATE_TRX_OFF,
 923                                              at86rf230_xmit_start);
 924         } else {
 925                 lp->is_tx_from_off = false;
 926                 at86rf230_xmit_start(ctx);
 927         }
 928
 929         return 0;
 930 }
 931
 932 static int
 933 at86rf230_ed(struct ieee802154_hw *hw, u8 *level)
 934 {
 935         WARN_ON(!level);
 936         *level = 0xbe;
 937         return 0;
 938 }
 939
 940 static int
 941 at86rf230_start(struct ieee802154_hw *hw)
 942 {
 943         struct at86rf230_local *lp = hw->priv;
 944
 945         /* reset trac stats on start */
 946         if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS))
 947                 memset(&lp->trac, 0, sizeof(struct at86rf230_trac));
 948
 949         at86rf230_awake(lp);
 950         enable_irq(lp->spi->irq);
 951
 952         return at86rf230_sync_state_change(lp, STATE_RX_AACK_ON);
 953 }
 954
 955 static void
 956 at86rf230_stop(struct ieee802154_hw *hw)
 957 {
 958         struct at86rf230_local *lp = hw->priv;
 959         u8 csma_seed[2];
 960
 961         at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
 962
 963         disable_irq(lp->spi->irq);
 964
 965         /* It's recommended to set random new csma_seeds before sleep state.
 966          * Makes only sense in the stop callback, not doing this inside of
 967          * at86rf230_sleep, this is also used when we don't transmit afterwards
 968          * when calling start callback again.
 969          */
 970         get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
 971         at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
 972         at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
 973
 974         at86rf230_sleep(lp);
 975 }
 976
 977 static int
 978 at86rf23x_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
 979 {
 980         return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
 981 }
 982
 983 #define AT86RF2XX_MAX_ED_LEVELS 0xF
 984 static const s32 at86rf233_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = {
 985         -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000, -7800, -7600,
 986         -7400, -7200, -7000, -6800, -6600, -6400,
 987 };
 988
 989 static const s32 at86rf231_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = {
 990         -9100, -8900, -8700, -8500, -8300, -8100, -7900, -7700, -7500, -7300,
 991         -7100, -6900, -6700, -6500, -6300, -6100,
 992 };
 993
 994 static const s32 at86rf212_ed_levels_100[AT86RF2XX_MAX_ED_LEVELS + 1] = {
 995         -10000, -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200,
 996         -8000, -7800, -7600, -7400, -7200, -7000,
 997 };
 998
 999 static const s32 at86rf212_ed_levels_98[AT86RF2XX_MAX_ED_LEVELS + 1] = {
1000         -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000,
1001         -7800, -7600, -7400, -7200, -7000, -6800,
1002 };
1003
1004 static inline int
1005 at86rf212_update_cca_ed_level(struct at86rf230_local *lp, int rssi_base_val)
1006 {
1007         unsigned int cca_ed_thres;
1008         int rc;
1009
1010         rc = at86rf230_read_subreg(lp, SR_CCA_ED_THRES, &cca_ed_thres);
1011         if (rc < 0)
1012                 return rc;
1013
1014         switch (rssi_base_val) {
1015         case -98:
1016                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_98;
1017                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_98);
1018                 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_98[cca_ed_thres];
1019                 break;
1020         case -100:
1021                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
1022                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
1023                 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_100[cca_ed_thres];
1024                 break;
1025         default:
1026                 WARN_ON(1);
1027         }
1028
1029         return 0;
1030 }
1031
1032 static int
1033 at86rf212_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
1034 {
1035         int rc;
1036
1037         if (channel == 0)
1038                 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 0);
1039         else
1040                 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 1);
1041         if (rc < 0)
1042                 return rc;
1043
1044         if (page == 0) {
1045                 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 0);
1046                 lp->data->rssi_base_val = -100;
1047         } else {
1048                 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 1);
1049                 lp->data->rssi_base_val = -98;
1050         }
1051         if (rc < 0)
1052                 return rc;
1053
1054         rc = at86rf212_update_cca_ed_level(lp, lp->data->rssi_base_val);
1055         if (rc < 0)
1056                 return rc;
1057
1058         /* This sets the symbol_duration according frequency on the 212.
1059          * TODO move this handling while set channel and page in cfg802154.
1060          * We can do that, this timings are according 802.15.4 standard.
1061          * If we do that in cfg802154, this is a more generic calculation.
1062          *
1063          * This should also protected from ifs_timer. Means cancel timer and
1064          * init with a new value. For now, this is okay.
1065          */
1066         if (channel == 0) {
1067                 if (page == 0) {
1068                         /* SUB:0 and BPSK:0 -> BPSK-20 */
1069                         lp->hw->phy->symbol_duration = 50;
1070                 } else {
1071                         /* SUB:1 and BPSK:0 -> BPSK-40 */
1072                         lp->hw->phy->symbol_duration = 25;
1073                 }
1074         } else {
1075                 if (page == 0)
1076                         /* SUB:0 and BPSK:1 -> OQPSK-100/200/400 */
1077                         lp->hw->phy->symbol_duration = 40;
1078                 else
1079                         /* SUB:1 and BPSK:1 -> OQPSK-250/500/1000 */
1080                         lp->hw->phy->symbol_duration = 16;
1081         }
1082
1083         lp->hw->phy->lifs_period = IEEE802154_LIFS_PERIOD *
1084                                    lp->hw->phy->symbol_duration;
1085         lp->hw->phy->sifs_period = IEEE802154_SIFS_PERIOD *
1086                                    lp->hw->phy->symbol_duration;
1087
1088         return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
1089 }
1090
1091 static int
1092 at86rf230_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
1093 {
1094         struct at86rf230_local *lp = hw->priv;
1095         int rc;
1096
1097         rc = lp->data->set_channel(lp, page, channel);
1098         /* Wait for PLL */
1099         usleep_range(lp->data->t_channel_switch,
1100                      lp->data->t_channel_switch + 10);
1101
1102         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
1103         return rc;
1104 }
1105
1106 static int
1107 at86rf230_set_hw_addr_filt(struct ieee802154_hw *hw,
1108                            struct ieee802154_hw_addr_filt *filt,
1109                            unsigned long changed)
1110 {
1111         struct at86rf230_local *lp = hw->priv;
1112
1113         if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
1114                 u16 addr = le16_to_cpu(filt->short_addr);
1115
1116                 dev_vdbg(&lp->spi->dev, "%s called for saddr\n", __func__);
1117                 __at86rf230_write(lp, RG_SHORT_ADDR_0, addr);
1118                 __at86rf230_write(lp, RG_SHORT_ADDR_1, addr >> 8);
1119         }
1120
1121         if (changed & IEEE802154_AFILT_PANID_CHANGED) {
1122                 u16 pan = le16_to_cpu(filt->pan_id);
1123
1124                 dev_vdbg(&lp->spi->dev, "%s called for pan id\n", __func__);
1125                 __at86rf230_write(lp, RG_PAN_ID_0, pan);
1126                 __at86rf230_write(lp, RG_PAN_ID_1, pan >> 8);
1127         }
1128
1129         if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
1130                 u8 i, addr[8];
1131
1132                 memcpy(addr, &filt->ieee_addr, 8);
1133                 dev_vdbg(&lp->spi->dev, "%s called for IEEE addr\n", __func__);
1134                 for (i = 0; i < 8; i++)
1135                         __at86rf230_write(lp, RG_IEEE_ADDR_0 + i, addr[i]);
1136         }
1137
1138         if (changed & IEEE802154_AFILT_PANC_CHANGED) {
1139                 dev_vdbg(&lp->spi->dev, "%s called for panc change\n", __func__);
1140                 if (filt->pan_coord)
1141                         at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 1);
1142                 else
1143                         at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 0);
1144         }
1145
1146         return 0;
1147 }
1148
1149 #define AT86RF23X_MAX_TX_POWERS 0xF
1150 static const s32 at86rf233_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1151         400, 370, 340, 300, 250, 200, 100, 0, -100, -200, -300, -400, -600,
1152         -800, -1200, -1700,
1153 };
1154
1155 static const s32 at86rf231_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1156         300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700,
1157         -900, -1200, -1700,
1158 };
1159
1160 #define AT86RF212_MAX_TX_POWERS 0x1F
1161 static const s32 at86rf212_powers[AT86RF212_MAX_TX_POWERS + 1] = {
1162         500, 400, 300, 200, 100, 0, -100, -200, -300, -400, -500, -600, -700,
1163         -800, -900, -1000, -1100, -1200, -1300, -1400, -1500, -1600, -1700,
1164         -1800, -1900, -2000, -2100, -2200, -2300, -2400, -2500, -2600,
1165 };
1166
1167 static int
1168 at86rf23x_set_txpower(struct at86rf230_local *lp, s32 mbm)
1169 {
1170         u32 i;
1171
1172         for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1173                 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1174                         return at86rf230_write_subreg(lp, SR_TX_PWR_23X, i);
1175         }
1176
1177         return -EINVAL;
1178 }
1179
1180 static int
1181 at86rf212_set_txpower(struct at86rf230_local *lp, s32 mbm)
1182 {
1183         u32 i;
1184
1185         for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1186                 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1187                         return at86rf230_write_subreg(lp, SR_TX_PWR_212, i);
1188         }
1189
1190         return -EINVAL;
1191 }
1192
1193 static int
1194 at86rf230_set_txpower(struct ieee802154_hw *hw, s32 mbm)
1195 {
1196         struct at86rf230_local *lp = hw->priv;
1197
1198         return lp->data->set_txpower(lp, mbm);
1199 }
1200
1201 static int
1202 at86rf230_set_lbt(struct ieee802154_hw *hw, bool on)
1203 {
1204         struct at86rf230_local *lp = hw->priv;
1205
1206         return at86rf230_write_subreg(lp, SR_CSMA_LBT_MODE, on);
1207 }
1208
1209 static int
1210 at86rf230_set_cca_mode(struct ieee802154_hw *hw,
1211                        const struct wpan_phy_cca *cca)
1212 {
1213         struct at86rf230_local *lp = hw->priv;
1214         u8 val;
1215
1216         /* mapping 802.15.4 to driver spec */
1217         switch (cca->mode) {
1218         case NL802154_CCA_ENERGY:
1219                 val = 1;
1220                 break;
1221         case NL802154_CCA_CARRIER:
1222                 val = 2;
1223                 break;
1224         case NL802154_CCA_ENERGY_CARRIER:
1225                 switch (cca->opt) {
1226                 case NL802154_CCA_OPT_ENERGY_CARRIER_AND:
1227                         val = 3;
1228                         break;
1229                 case NL802154_CCA_OPT_ENERGY_CARRIER_OR:
1230                         val = 0;
1231                         break;
1232                 default:
1233                         return -EINVAL;
1234                 }
1235                 break;
1236         default:
1237                 return -EINVAL;
1238         }
1239
1240         return at86rf230_write_subreg(lp, SR_CCA_MODE, val);
1241 }
1242
1243 static int
1244 at86rf230_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
1245 {
1246         struct at86rf230_local *lp = hw->priv;
1247         u32 i;
1248
1249         for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) {
1250                 if (hw->phy->supported.cca_ed_levels[i] == mbm)
1251                         return at86rf230_write_subreg(lp, SR_CCA_ED_THRES, i);
1252         }
1253
1254         return -EINVAL;
1255 }
1256
1257 static int
1258 at86rf230_set_csma_params(struct ieee802154_hw *hw, u8 min_be, u8 max_be,
1259                           u8 retries)
1260 {
1261         struct at86rf230_local *lp = hw->priv;
1262         int rc;
1263
1264         rc = at86rf230_write_subreg(lp, SR_MIN_BE, min_be);
1265         if (rc)
1266                 return rc;
1267
1268         rc = at86rf230_write_subreg(lp, SR_MAX_BE, max_be);
1269         if (rc)
1270                 return rc;
1271
1272         return at86rf230_write_subreg(lp, SR_MAX_CSMA_RETRIES, retries);
1273 }
1274
1275 static int
1276 at86rf230_set_frame_retries(struct ieee802154_hw *hw, s8 retries)
1277 {
1278         struct at86rf230_local *lp = hw->priv;
1279
1280         return at86rf230_write_subreg(lp, SR_MAX_FRAME_RETRIES, retries);
1281 }
1282
1283 static int
1284 at86rf230_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
1285 {
1286         struct at86rf230_local *lp = hw->priv;
1287         int rc;
1288
1289         if (on) {
1290                 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 1);
1291                 if (rc < 0)
1292                         return rc;
1293
1294                 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 1);
1295                 if (rc < 0)
1296                         return rc;
1297         } else {
1298                 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 0);
1299                 if (rc < 0)
1300                         return rc;
1301
1302                 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 0);
1303                 if (rc < 0)
1304                         return rc;
1305         }
1306
1307         return 0;
1308 }
1309
1310 static const struct ieee802154_ops at86rf230_ops = {
1311         .owner = THIS_MODULE,
1312         .xmit_async = at86rf230_xmit,
1313         .ed = at86rf230_ed,
1314         .set_channel = at86rf230_channel,
1315         .start = at86rf230_start,
1316         .stop = at86rf230_stop,
1317         .set_hw_addr_filt = at86rf230_set_hw_addr_filt,
1318         .set_txpower = at86rf230_set_txpower,
1319         .set_lbt = at86rf230_set_lbt,
1320         .set_cca_mode = at86rf230_set_cca_mode,
1321         .set_cca_ed_level = at86rf230_set_cca_ed_level,
1322         .set_csma_params = at86rf230_set_csma_params,
1323         .set_frame_retries = at86rf230_set_frame_retries,
1324         .set_promiscuous_mode = at86rf230_set_promiscuous_mode,
1325 };
1326
1327 static struct at86rf2xx_chip_data at86rf233_data = {
1328         .t_sleep_cycle = 330,
1329         .t_channel_switch = 11,
1330         .t_reset_to_off = 26,
1331         .t_off_to_aack = 80,
1332         .t_off_to_tx_on = 80,
1333         .t_off_to_sleep = 35,
1334         .t_sleep_to_off = 1000,
1335         .t_frame = 4096,
1336         .t_p_ack = 545,
1337         .rssi_base_val = -94,
1338         .set_channel = at86rf23x_set_channel,
1339         .set_txpower = at86rf23x_set_txpower,
1340 };
1341
1342 static struct at86rf2xx_chip_data at86rf231_data = {
1343         .t_sleep_cycle = 330,
1344         .t_channel_switch = 24,
1345         .t_reset_to_off = 37,
1346         .t_off_to_aack = 110,
1347         .t_off_to_tx_on = 110,
1348         .t_off_to_sleep = 35,
1349         .t_sleep_to_off = 1000,
1350         .t_frame = 4096,
1351         .t_p_ack = 545,
1352         .rssi_base_val = -91,
1353         .set_channel = at86rf23x_set_channel,
1354         .set_txpower = at86rf23x_set_txpower,
1355 };
1356
1357 static struct at86rf2xx_chip_data at86rf212_data = {
1358         .t_sleep_cycle = 330,
1359         .t_channel_switch = 11,
1360         .t_reset_to_off = 26,
1361         .t_off_to_aack = 200,
1362         .t_off_to_tx_on = 200,
1363         .t_off_to_sleep = 35,
1364         .t_sleep_to_off = 1000,
1365         .t_frame = 4096,
1366         .t_p_ack = 545,
1367         .rssi_base_val = -100,
1368         .set_channel = at86rf212_set_channel,
1369         .set_txpower = at86rf212_set_txpower,
1370 };
1371
1372 static int at86rf230_hw_init(struct at86rf230_local *lp, u8 xtal_trim)
1373 {
1374         int rc, irq_type, irq_pol = IRQ_ACTIVE_HIGH;
1375         unsigned int dvdd;
1376         u8 csma_seed[2];
1377
1378         rc = at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
1379         if (rc)
1380                 return rc;
1381
1382         irq_type = irq_get_trigger_type(lp->spi->irq);
1383         if (irq_type == IRQ_TYPE_EDGE_FALLING ||
1384             irq_type == IRQ_TYPE_LEVEL_LOW)
1385                 irq_pol = IRQ_ACTIVE_LOW;
1386
1387         rc = at86rf230_write_subreg(lp, SR_IRQ_POLARITY, irq_pol);
1388         if (rc)
1389                 return rc;
1390
1391         rc = at86rf230_write_subreg(lp, SR_RX_SAFE_MODE, 1);
1392         if (rc)
1393                 return rc;
1394
1395         rc = at86rf230_write_subreg(lp, SR_IRQ_MASK, IRQ_TRX_END);
1396         if (rc)
1397                 return rc;
1398
1399         /* reset values differs in at86rf231 and at86rf233 */
1400         rc = at86rf230_write_subreg(lp, SR_IRQ_MASK_MODE, 0);
1401         if (rc)
1402                 return rc;
1403
1404         get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
1405         rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
1406         if (rc)
1407                 return rc;
1408         rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
1409         if (rc)
1410                 return rc;
1411
1412         /* CLKM changes are applied immediately */
1413         rc = at86rf230_write_subreg(lp, SR_CLKM_SHA_SEL, 0x00);
1414         if (rc)
1415                 return rc;
1416
1417         /* Turn CLKM Off */
1418         rc = at86rf230_write_subreg(lp, SR_CLKM_CTRL, 0x00);
1419         if (rc)
1420                 return rc;
1421         /* Wait the next SLEEP cycle */
1422         usleep_range(lp->data->t_sleep_cycle,
1423                      lp->data->t_sleep_cycle + 100);
1424
1425         /* xtal_trim value is calculated by:
1426          * CL = 0.5 * (CX + CTRIM + CPAR)
1427          *
1428          * whereas:
1429          * CL = capacitor of used crystal
1430          * CX = connected capacitors at xtal pins
1431          * CPAR = in all at86rf2xx datasheets this is a constant value 3 pF,
1432          *        but this is different on each board setup. You need to fine
1433          *        tuning this value via CTRIM.
1434          * CTRIM = variable capacitor setting. Resolution is 0.3 pF range is
1435          *         0 pF upto 4.5 pF.
1436          *
1437          * Examples:
1438          * atben transceiver:
1439          *
1440          * CL = 8 pF
1441          * CX = 12 pF
1442          * CPAR = 3 pF (We assume the magic constant from datasheet)
1443          * CTRIM = 0.9 pF
1444          *
1445          * (12+0.9+3)/2 = 7.95 which is nearly at 8 pF
1446          *
1447          * xtal_trim = 0x3
1448          *
1449          * openlabs transceiver:
1450          *
1451          * CL = 16 pF
1452          * CX = 22 pF
1453          * CPAR = 3 pF (We assume the magic constant from datasheet)
1454          * CTRIM = 4.5 pF
1455          *
1456          * (22+4.5+3)/2 = 14.75 which is the nearest value to 16 pF
1457          *
1458          * xtal_trim = 0xf
1459          */
1460         rc = at86rf230_write_subreg(lp, SR_XTAL_TRIM, xtal_trim);
1461         if (rc)
1462                 return rc;
1463
1464         rc = at86rf230_read_subreg(lp, SR_DVDD_OK, &dvdd);
1465         if (rc)
1466                 return rc;
1467         if (!dvdd) {
1468                 dev_err(&lp->spi->dev, "DVDD error\n");
1469                 return -EINVAL;
1470         }
1471
1472         /* Force setting slotted operation bit to 0. Sometimes the atben
1473          * sets this bit and I don't know why. We set this always force
1474          * to zero while probing.
1475          */
1476         return at86rf230_write_subreg(lp, SR_SLOTTED_OPERATION, 0);
1477 }
1478
1479 static int
1480 at86rf230_get_pdata(struct spi_device *spi, int *rstn, int *slp_tr,
1481                     u8 *xtal_trim)
1482 {
1483         struct at86rf230_platform_data *pdata = spi->dev.platform_data;
1484         int ret;
1485
1486         if (!IS_ENABLED(CONFIG_OF) || !spi->dev.of_node) {
1487                 if (!pdata)
1488                         return -ENOENT;
1489
1490                 *rstn = pdata->rstn;
1491                 *slp_tr = pdata->slp_tr;
1492                 *xtal_trim = pdata->xtal_trim;
1493                 return 0;
1494         }
1495
1496         *rstn = of_get_named_gpio(spi->dev.of_node, "reset-gpio", 0);
1497         *slp_tr = of_get_named_gpio(spi->dev.of_node, "sleep-gpio", 0);
1498         ret = of_property_read_u8(spi->dev.of_node, "xtal-trim", xtal_trim);
1499         if (ret < 0 && ret != -EINVAL)
1500                 return ret;
1501
1502         return 0;
1503 }
1504
1505 static int
1506 at86rf230_detect_device(struct at86rf230_local *lp)
1507 {
1508         unsigned int part, version, val;
1509         u16 man_id = 0;
1510         const char *chip;
1511         int rc;
1512
1513         rc = __at86rf230_read(lp, RG_MAN_ID_0, &val);
1514         if (rc)
1515                 return rc;
1516         man_id |= val;
1517
1518         rc = __at86rf230_read(lp, RG_MAN_ID_1, &val);
1519         if (rc)
1520                 return rc;
1521         man_id |= (val << 8);
1522
1523         rc = __at86rf230_read(lp, RG_PART_NUM, &part);
1524         if (rc)
1525                 return rc;
1526
1527         rc = __at86rf230_read(lp, RG_VERSION_NUM, &version);
1528         if (rc)
1529                 return rc;
1530
1531         if (man_id != 0x001f) {
1532                 dev_err(&lp->spi->dev, "Non-Atmel dev found (MAN_ID %02x %02x)\n",
1533                         man_id >> 8, man_id & 0xFF);
1534                 return -EINVAL;
1535         }
1536
1537         lp->hw->flags = IEEE802154_HW_TX_OMIT_CKSUM |
1538                         IEEE802154_HW_CSMA_PARAMS |
1539                         IEEE802154_HW_FRAME_RETRIES | IEEE802154_HW_AFILT |
1540                         IEEE802154_HW_PROMISCUOUS;
1541
1542         lp->hw->phy->flags = WPAN_PHY_FLAG_TXPOWER |
1543                              WPAN_PHY_FLAG_CCA_ED_LEVEL |
1544                              WPAN_PHY_FLAG_CCA_MODE;
1545
1546         lp->hw->phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY) |
1547                 BIT(NL802154_CCA_CARRIER) | BIT(NL802154_CCA_ENERGY_CARRIER);
1548         lp->hw->phy->supported.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND) |
1549                 BIT(NL802154_CCA_OPT_ENERGY_CARRIER_OR);
1550
1551         lp->hw->phy->cca.mode = NL802154_CCA_ENERGY;
1552
1553         switch (part) {
1554         case 2:
1555                 chip = "at86rf230";
1556                 rc = -ENOTSUPP;
1557                 goto not_supp;
1558         case 3:
1559                 chip = "at86rf231";
1560                 lp->data = &at86rf231_data;
1561                 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1562                 lp->hw->phy->current_channel = 11;
1563                 lp->hw->phy->symbol_duration = 16;
1564                 lp->hw->phy->supported.tx_powers = at86rf231_powers;
1565                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf231_powers);
1566                 lp->hw->phy->supported.cca_ed_levels = at86rf231_ed_levels;
1567                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf231_ed_levels);
1568                 break;
1569         case 7:
1570                 chip = "at86rf212";
1571                 lp->data = &at86rf212_data;
1572                 lp->hw->flags |= IEEE802154_HW_LBT;
1573                 lp->hw->phy->supported.channels[0] = 0x00007FF;
1574                 lp->hw->phy->supported.channels[2] = 0x00007FF;
1575                 lp->hw->phy->current_channel = 5;
1576                 lp->hw->phy->symbol_duration = 25;
1577                 lp->hw->phy->supported.lbt = NL802154_SUPPORTED_BOOL_BOTH;
1578                 lp->hw->phy->supported.tx_powers = at86rf212_powers;
1579                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf212_powers);
1580                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
1581                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
1582                 break;
1583         case 11:
1584                 chip = "at86rf233";
1585                 lp->data = &at86rf233_data;
1586                 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1587                 lp->hw->phy->current_channel = 13;
1588                 lp->hw->phy->symbol_duration = 16;
1589                 lp->hw->phy->supported.tx_powers = at86rf233_powers;
1590                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf233_powers);
1591                 lp->hw->phy->supported.cca_ed_levels = at86rf233_ed_levels;
1592                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf233_ed_levels);
1593                 break;
1594         default:
1595                 chip = "unknown";
1596                 rc = -ENOTSUPP;
1597                 goto not_supp;
1598         }
1599
1600         lp->hw->phy->cca_ed_level = lp->hw->phy->supported.cca_ed_levels[7];
1601         lp->hw->phy->transmit_power = lp->hw->phy->supported.tx_powers[0];
1602
1603 not_supp:
1604         dev_info(&lp->spi->dev, "Detected %s chip version %d\n", chip, version);
1605
1606         return rc;
1607 }
1608
1609 #ifdef CONFIG_IEEE802154_AT86RF230_DEBUGFS
1610 static struct dentry *at86rf230_debugfs_root;
1611
1612 static int at86rf230_stats_show(struct seq_file *file, void *offset)
1613 {
1614         struct at86rf230_local *lp = file->private;
1615
1616         seq_printf(file, "SUCCESS:\t\t%8llu\n", lp->trac.success);
1617         seq_printf(file, "SUCCESS_DATA_PENDING:\t%8llu\n",
1618                    lp->trac.success_data_pending);
1619         seq_printf(file, "SUCCESS_WAIT_FOR_ACK:\t%8llu\n",
1620                    lp->trac.success_wait_for_ack);
1621         seq_printf(file, "CHANNEL_ACCESS_FAILURE:\t%8llu\n",
1622                    lp->trac.channel_access_failure);
1623         seq_printf(file, "NO_ACK:\t\t\t%8llu\n", lp->trac.no_ack);
1624         seq_printf(file, "INVALID:\t\t%8llu\n", lp->trac.invalid);
1625         return 0;
1626 }
1627 DEFINE_SHOW_ATTRIBUTE(at86rf230_stats);
1628
1629 static void at86rf230_debugfs_init(struct at86rf230_local *lp)
1630 {
1631         char debugfs_dir_name[DNAME_INLINE_LEN + 1] = "at86rf230-";
1632
1633         strncat(debugfs_dir_name, dev_name(&lp->spi->dev), DNAME_INLINE_LEN);
1634
1635         at86rf230_debugfs_root = debugfs_create_dir(debugfs_dir_name, NULL);
1636
1637         debugfs_create_file("trac_stats", 0444, at86rf230_debugfs_root, lp,
1638                             &at86rf230_stats_fops);
1639 }
1640
1641 static void at86rf230_debugfs_remove(void)
1642 {
1643         debugfs_remove_recursive(at86rf230_debugfs_root);
1644 }
1645 #else
1646 static void at86rf230_debugfs_init(struct at86rf230_local *lp) { }
1647 static void at86rf230_debugfs_remove(void) { }
1648 #endif
1649
1650 static int at86rf230_probe(struct spi_device *spi)
1651 {
1652         struct ieee802154_hw *hw;
1653         struct at86rf230_local *lp;
1654         unsigned int status;
1655         int rc, irq_type, rstn, slp_tr;
1656         u8 xtal_trim = 0;
1657
1658         if (!spi->irq) {
1659                 dev_err(&spi->dev, "no IRQ specified\n");
1660                 return -EINVAL;
1661         }
1662
1663         rc = at86rf230_get_pdata(spi, &rstn, &slp_tr, &xtal_trim);
1664         if (rc < 0) {
1665                 dev_err(&spi->dev, "failed to parse platform_data: %d\n", rc);
1666                 return rc;
1667         }
1668
1669         if (gpio_is_valid(rstn)) {
1670                 rc = devm_gpio_request_one(&spi->dev, rstn,
1671                                            GPIOF_OUT_INIT_HIGH, "rstn");
1672                 if (rc)
1673                         return rc;
1674         }
1675
1676         if (gpio_is_valid(slp_tr)) {
1677                 rc = devm_gpio_request_one(&spi->dev, slp_tr,
1678                                            GPIOF_OUT_INIT_LOW, "slp_tr");
1679                 if (rc)
1680                         return rc;
1681         }
1682
1683         /* Reset */
1684         if (gpio_is_valid(rstn)) {
1685                 udelay(1);
1686                 gpio_set_value_cansleep(rstn, 0);
1687                 udelay(1);
1688                 gpio_set_value_cansleep(rstn, 1);
1689                 usleep_range(120, 240);
1690         }
1691
1692         hw = ieee802154_alloc_hw(sizeof(*lp), &at86rf230_ops);
1693         if (!hw)
1694                 return -ENOMEM;
1695
1696         lp = hw->priv;
1697         lp->hw = hw;
1698         lp->spi = spi;
1699         lp->slp_tr = slp_tr;
1700         hw->parent = &spi->dev;
1701         ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
1702
1703         lp->regmap = devm_regmap_init_spi(spi, &at86rf230_regmap_spi_config);
1704         if (IS_ERR(lp->regmap)) {
1705                 rc = PTR_ERR(lp->regmap);
1706                 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
1707                         rc);
1708                 goto free_dev;
1709         }
1710
1711         at86rf230_setup_spi_messages(lp, &lp->state);
1712         at86rf230_setup_spi_messages(lp, &lp->tx);
1713
1714         rc = at86rf230_detect_device(lp);
1715         if (rc < 0)
1716                 goto free_dev;
1717
1718         init_completion(&lp->state_complete);
1719
1720         spi_set_drvdata(spi, lp);
1721
1722         rc = at86rf230_hw_init(lp, xtal_trim);
1723         if (rc)
1724                 goto free_dev;
1725
1726         /* Read irq status register to reset irq line */
1727         rc = at86rf230_read_subreg(lp, RG_IRQ_STATUS, 0xff, 0, &status);
1728         if (rc)
1729                 goto free_dev;
1730
1731         irq_type = irq_get_trigger_type(spi->irq);
1732         if (!irq_type)
1733                 irq_type = IRQF_TRIGGER_HIGH;
1734
1735         rc = devm_request_irq(&spi->dev, spi->irq, at86rf230_isr,
1736                               IRQF_SHARED | irq_type, dev_name(&spi->dev), lp);
1737         if (rc)
1738                 goto free_dev;
1739
1740         /* disable_irq by default and wait for starting hardware */
1741         disable_irq(spi->irq);
1742
1743         /* going into sleep by default */
1744         at86rf230_sleep(lp);
1745
1746         at86rf230_debugfs_init(lp);
1747
1748         rc = ieee802154_register_hw(lp->hw);
1749         if (rc)
1750                 goto free_debugfs;
1751
1752         return rc;
1753
1754 free_debugfs:
1755         at86rf230_debugfs_remove();
1756 free_dev:
1757         ieee802154_free_hw(lp->hw);
1758
1759         return rc;
1760 }
1761
1762 static int at86rf230_remove(struct spi_device *spi)
1763 {
1764         struct at86rf230_local *lp = spi_get_drvdata(spi);
1765
1766         /* mask all at86rf230 irq's */
1767         at86rf230_write_subreg(lp, SR_IRQ_MASK, 0);
1768         ieee802154_unregister_hw(lp->hw);
1769         ieee802154_free_hw(lp->hw);
1770         at86rf230_debugfs_remove();
1771         dev_dbg(&spi->dev, "unregistered at86rf230\n");
1772
1773         return 0;
1774 }
1775
1776 static const struct of_device_id at86rf230_of_match[] = {
1777         { .compatible = "atmel,at86rf230", },
1778         { .compatible = "atmel,at86rf231", },
1779         { .compatible = "atmel,at86rf233", },
1780         { .compatible = "atmel,at86rf212", },
1781         { },
1782 };
1783 MODULE_DEVICE_TABLE(of, at86rf230_of_match);
1784
1785 static const struct spi_device_id at86rf230_device_id[] = {
1786         { .name = "at86rf230", },
1787         { .name = "at86rf231", },
1788         { .name = "at86rf233", },
1789         { .name = "at86rf212", },
1790         { },
1791 };
1792 MODULE_DEVICE_TABLE(spi, at86rf230_device_id);
1793
1794 static struct spi_driver at86rf230_driver = {
1795         .id_table = at86rf230_device_id,
1796         .driver = {
1797                 .of_match_table = of_match_ptr(at86rf230_of_match),
1798                 .name   = "at86rf230",
1799         },
1800         .probe      = at86rf230_probe,
1801         .remove     = at86rf230_remove,
1802 };
1803
1804 module_spi_driver(at86rf230_driver);
1805
1806 MODULE_DESCRIPTION("AT86RF230 Transceiver Driver");
1807 MODULE_LICENSE("GPL v2");