drivers/net/ieee802154/at86rf230.c

   1 /*
   2  * AT86RF230/RF231 driver
   3  *
   4  * Copyright (C) 2009-2012 Siemens AG
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * Written by:
  16  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
  17  * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
  18  * Alexander Aring <aar@pengutronix.de>
  19  */
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/hrtimer.h>
  23 #include <linux/jiffies.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/irq.h>
  26 #include <linux/gpio.h>
  27 #include <linux/delay.h>
  28 #include <linux/spi/spi.h>
  29 #include <linux/spi/at86rf230.h>
  30 #include <linux/regmap.h>
  31 #include <linux/skbuff.h>
  32 #include <linux/of_gpio.h>
  33 #include <linux/ieee802154.h>
  34 #include <linux/debugfs.h>
  35
  36 #include <net/mac802154.h>
  37 #include <net/cfg802154.h>
  38
  39 #include "at86rf230.h"
  40
  41 struct at86rf230_local;
  42 /* at86rf2xx chip depend data.
  43  * All timings are in us.
  44  */
  45 struct at86rf2xx_chip_data {
  46         u16 t_sleep_cycle;
  47         u16 t_channel_switch;
  48         u16 t_reset_to_off;
  49         u16 t_off_to_aack;
  50         u16 t_off_to_tx_on;
  51         u16 t_off_to_sleep;
  52         u16 t_sleep_to_off;
  53         u16 t_frame;
  54         u16 t_p_ack;
  55         int rssi_base_val;
  56
  57         int (*set_channel)(struct at86rf230_local *, u8, u8);
  58         int (*set_txpower)(struct at86rf230_local *, s32);
  59 };
  60
  61 #define AT86RF2XX_MAX_BUF               (127 + 3)
  62 /* tx retries to access the TX_ON state
  63  * if it's above then force change will be started.
  64  *
  65  * We assume the max_frame_retries (7) value of 802.15.4 here.
  66  */
  67 #define AT86RF2XX_MAX_TX_RETRIES        7
  68 /* We use the recommended 5 minutes timeout to recalibrate */
  69 #define AT86RF2XX_CAL_LOOP_TIMEOUT      (5 * 60 * HZ)
  70
  71 struct at86rf230_state_change {
  72         struct at86rf230_local *lp;
  73         int irq;
  74
  75         struct hrtimer timer;
  76         struct spi_message msg;
  77         struct spi_transfer trx;
  78         u8 buf[AT86RF2XX_MAX_BUF];
  79
  80         void (*complete)(void *context);
  81         u8 from_state;
  82         u8 to_state;
  83
  84         bool free;
  85 };
  86
  87 struct at86rf230_trac {
  88         u64 success;
  89         u64 success_data_pending;
  90         u64 success_wait_for_ack;
  91         u64 channel_access_failure;
  92         u64 no_ack;
  93         u64 invalid;
  94 };
  95
  96 struct at86rf230_local {
  97         struct spi_device *spi;
  98
  99         struct ieee802154_hw *hw;
 100         struct at86rf2xx_chip_data *data;
 101         struct regmap *regmap;
 102         int slp_tr;
 103         bool sleep;
 104
 105         struct completion state_complete;
 106         struct at86rf230_state_change state;
 107
 108         unsigned long cal_timeout;
 109         bool is_tx;
 110         bool is_tx_from_off;
 111         bool was_tx;
 112         u8 tx_retry;
 113         struct sk_buff *tx_skb;
 114         struct at86rf230_state_change tx;
 115
 116         struct at86rf230_trac trac;
 117 };
 118
 119 #define AT86RF2XX_NUMREGS 0x3F
 120
 121 static void
 122 at86rf230_async_state_change(struct at86rf230_local *lp,
 123                              struct at86rf230_state_change *ctx,
 124                              const u8 state, void (*complete)(void *context));
 125
 126 static inline void
 127 at86rf230_sleep(struct at86rf230_local *lp)
 128 {
 129         if (gpio_is_valid(lp->slp_tr)) {
 130                 gpio_set_value(lp->slp_tr, 1);
 131                 usleep_range(lp->data->t_off_to_sleep,
 132                              lp->data->t_off_to_sleep + 10);
 133                 lp->sleep = true;
 134         }
 135 }
 136
 137 static inline void
 138 at86rf230_awake(struct at86rf230_local *lp)
 139 {
 140         if (gpio_is_valid(lp->slp_tr)) {
 141                 gpio_set_value(lp->slp_tr, 0);
 142                 usleep_range(lp->data->t_sleep_to_off,
 143                              lp->data->t_sleep_to_off + 100);
 144                 lp->sleep = false;
 145         }
 146 }
 147
 148 static inline int
 149 __at86rf230_write(struct at86rf230_local *lp,
 150                   unsigned int addr, unsigned int data)
 151 {
 152         bool sleep = lp->sleep;
 153         int ret;
 154
 155         /* awake for register setting if sleep */
 156         if (sleep)
 157                 at86rf230_awake(lp);
 158
 159         ret = regmap_write(lp->regmap, addr, data);
 160
 161         /* sleep again if was sleeping */
 162         if (sleep)
 163                 at86rf230_sleep(lp);
 164
 165         return ret;
 166 }
 167
 168 static inline int
 169 __at86rf230_read(struct at86rf230_local *lp,
 170                  unsigned int addr, unsigned int *data)
 171 {
 172         bool sleep = lp->sleep;
 173         int ret;
 174
 175         /* awake for register setting if sleep */
 176         if (sleep)
 177                 at86rf230_awake(lp);
 178
 179         ret = regmap_read(lp->regmap, addr, data);
 180
 181         /* sleep again if was sleeping */
 182         if (sleep)
 183                 at86rf230_sleep(lp);
 184
 185         return ret;
 186 }
 187
 188 static inline int
 189 at86rf230_read_subreg(struct at86rf230_local *lp,
 190                       unsigned int addr, unsigned int mask,
 191                       unsigned int shift, unsigned int *data)
 192 {
 193         int rc;
 194
 195         rc = __at86rf230_read(lp, addr, data);
 196         if (!rc)
 197                 *data = (*data & mask) >> shift;
 198
 199         return rc;
 200 }
 201
 202 static inline int
 203 at86rf230_write_subreg(struct at86rf230_local *lp,
 204                        unsigned int addr, unsigned int mask,
 205                        unsigned int shift, unsigned int data)
 206 {
 207         bool sleep = lp->sleep;
 208         int ret;
 209
 210         /* awake for register setting if sleep */
 211         if (sleep)
 212                 at86rf230_awake(lp);
 213
 214         ret = regmap_update_bits(lp->regmap, addr, mask, data << shift);
 215
 216         /* sleep again if was sleeping */
 217         if (sleep)
 218                 at86rf230_sleep(lp);
 219
 220         return ret;
 221 }
 222
 223 static inline void
 224 at86rf230_slp_tr_rising_edge(struct at86rf230_local *lp)
 225 {
 226         gpio_set_value(lp->slp_tr, 1);
 227         udelay(1);
 228         gpio_set_value(lp->slp_tr, 0);
 229 }
 230
 231 static bool
 232 at86rf230_reg_writeable(struct device *dev, unsigned int reg)
 233 {
 234         switch (reg) {
 235         case RG_TRX_STATE:
 236         case RG_TRX_CTRL_0:
 237         case RG_TRX_CTRL_1:
 238         case RG_PHY_TX_PWR:
 239         case RG_PHY_ED_LEVEL:
 240         case RG_PHY_CC_CCA:
 241         case RG_CCA_THRES:
 242         case RG_RX_CTRL:
 243         case RG_SFD_VALUE:
 244         case RG_TRX_CTRL_2:
 245         case RG_ANT_DIV:
 246         case RG_IRQ_MASK:
 247         case RG_VREG_CTRL:
 248         case RG_BATMON:
 249         case RG_XOSC_CTRL:
 250         case RG_RX_SYN:
 251         case RG_XAH_CTRL_1:
 252         case RG_FTN_CTRL:
 253         case RG_PLL_CF:
 254         case RG_PLL_DCU:
 255         case RG_SHORT_ADDR_0:
 256         case RG_SHORT_ADDR_1:
 257         case RG_PAN_ID_0:
 258         case RG_PAN_ID_1:
 259         case RG_IEEE_ADDR_0:
 260         case RG_IEEE_ADDR_1:
 261         case RG_IEEE_ADDR_2:
 262         case RG_IEEE_ADDR_3:
 263         case RG_IEEE_ADDR_4:
 264         case RG_IEEE_ADDR_5:
 265         case RG_IEEE_ADDR_6:
 266         case RG_IEEE_ADDR_7:
 267         case RG_XAH_CTRL_0:
 268         case RG_CSMA_SEED_0:
 269         case RG_CSMA_SEED_1:
 270         case RG_CSMA_BE:
 271                 return true;
 272         default:
 273                 return false;
 274         }
 275 }
 276
 277 static bool
 278 at86rf230_reg_readable(struct device *dev, unsigned int reg)
 279 {
 280         bool rc;
 281
 282         /* all writeable are also readable */
 283         rc = at86rf230_reg_writeable(dev, reg);
 284         if (rc)
 285                 return rc;
 286
 287         /* readonly regs */
 288         switch (reg) {
 289         case RG_TRX_STATUS:
 290         case RG_PHY_RSSI:
 291         case RG_IRQ_STATUS:
 292         case RG_PART_NUM:
 293         case RG_VERSION_NUM:
 294         case RG_MAN_ID_1:
 295         case RG_MAN_ID_0:
 296                 return true;
 297         default:
 298                 return false;
 299         }
 300 }
 301
 302 static bool
 303 at86rf230_reg_volatile(struct device *dev, unsigned int reg)
 304 {
 305         /* can be changed during runtime */
 306         switch (reg) {
 307         case RG_TRX_STATUS:
 308         case RG_TRX_STATE:
 309         case RG_PHY_RSSI:
 310         case RG_PHY_ED_LEVEL:
 311         case RG_IRQ_STATUS:
 312         case RG_VREG_CTRL:
 313         case RG_PLL_CF:
 314         case RG_PLL_DCU:
 315                 return true;
 316         default:
 317                 return false;
 318         }
 319 }
 320
 321 static bool
 322 at86rf230_reg_precious(struct device *dev, unsigned int reg)
 323 {
 324         /* don't clear irq line on read */
 325         switch (reg) {
 326         case RG_IRQ_STATUS:
 327                 return true;
 328         default:
 329                 return false;
 330         }
 331 }
 332
 333 static const struct regmap_config at86rf230_regmap_spi_config = {
 334         .reg_bits = 8,
 335         .val_bits = 8,
 336         .write_flag_mask = CMD_REG | CMD_WRITE,
 337         .read_flag_mask = CMD_REG,
 338         .cache_type = REGCACHE_RBTREE,
 339         .max_register = AT86RF2XX_NUMREGS,
 340         .writeable_reg = at86rf230_reg_writeable,
 341         .readable_reg = at86rf230_reg_readable,
 342         .volatile_reg = at86rf230_reg_volatile,
 343         .precious_reg = at86rf230_reg_precious,
 344 };
 345
 346 static void
 347 at86rf230_async_error_recover_complete(void *context)
 348 {
 349         struct at86rf230_state_change *ctx = context;
 350         struct at86rf230_local *lp = ctx->lp;
 351
 352         if (ctx->free)
 353                 kfree(ctx);
 354
 355         if (lp->was_tx) {
 356                 lp->was_tx = 0;
 357                 dev_kfree_skb_any(lp->tx_skb);
 358                 ieee802154_wake_queue(lp->hw);
 359         }
 360 }
 361
 362 static void
 363 at86rf230_async_error_recover(void *context)
 364 {
 365         struct at86rf230_state_change *ctx = context;
 366         struct at86rf230_local *lp = ctx->lp;
 367
 368         if (lp->is_tx) {
 369                 lp->was_tx = 1;
 370                 lp->is_tx = 0;
 371         }
 372
 373         at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON,
 374                                      at86rf230_async_error_recover_complete);
 375 }
 376
 377 static inline void
 378 at86rf230_async_error(struct at86rf230_local *lp,
 379                       struct at86rf230_state_change *ctx, int rc)
 380 {
 381         dev_err(&lp->spi->dev, "spi_async error %d\n", rc);
 382
 383         at86rf230_async_state_change(lp, ctx, STATE_FORCE_TRX_OFF,
 384                                      at86rf230_async_error_recover);
 385 }
 386
 387 /* Generic function to get some register value in async mode */
 388 static void
 389 at86rf230_async_read_reg(struct at86rf230_local *lp, u8 reg,
 390                          struct at86rf230_state_change *ctx,
 391                          void (*complete)(void *context))
 392 {
 393         int rc;
 394
 395         u8 *tx_buf = ctx->buf;
 396
 397         tx_buf[0] = (reg & CMD_REG_MASK) | CMD_REG;
 398         ctx->msg.complete = complete;
 399         rc = spi_async(lp->spi, &ctx->msg);
 400         if (rc)
 401                 at86rf230_async_error(lp, ctx, rc);
 402 }
 403
 404 static void
 405 at86rf230_async_write_reg(struct at86rf230_local *lp, u8 reg, u8 val,
 406                           struct at86rf230_state_change *ctx,
 407                           void (*complete)(void *context))
 408 {
 409         int rc;
 410
 411         ctx->buf[0] = (reg & CMD_REG_MASK) | CMD_REG | CMD_WRITE;
 412         ctx->buf[1] = val;
 413         ctx->msg.complete = complete;
 414         rc = spi_async(lp->spi, &ctx->msg);
 415         if (rc)
 416                 at86rf230_async_error(lp, ctx, rc);
 417 }
 418
 419 static void
 420 at86rf230_async_state_assert(void *context)
 421 {
 422         struct at86rf230_state_change *ctx = context;
 423         struct at86rf230_local *lp = ctx->lp;
 424         const u8 *buf = ctx->buf;
 425         const u8 trx_state = buf[1] & TRX_STATE_MASK;
 426
 427         /* Assert state change */
 428         if (trx_state != ctx->to_state) {
 429                 /* Special handling if transceiver state is in
 430                  * STATE_BUSY_RX_AACK and a SHR was detected.
 431                  */
 432                 if  (trx_state == STATE_BUSY_RX_AACK) {
 433                         /* Undocumented race condition. If we send a state
 434                          * change to STATE_RX_AACK_ON the transceiver could
 435                          * change his state automatically to STATE_BUSY_RX_AACK
 436                          * if a SHR was detected. This is not an error, but we
 437                          * can't assert this.
 438                          */
 439                         if (ctx->to_state == STATE_RX_AACK_ON)
 440                                 goto done;
 441
 442                         /* If we change to STATE_TX_ON without forcing and
 443                          * transceiver state is STATE_BUSY_RX_AACK, we wait
 444                          * 'tFrame + tPAck' receiving time. In this time the
 445                          * PDU should be received. If the transceiver is still
 446                          * in STATE_BUSY_RX_AACK, we run a force state change
 447                          * to STATE_TX_ON. This is a timeout handling, if the
 448                          * transceiver stucks in STATE_BUSY_RX_AACK.
 449                          *
 450                          * Additional we do several retries to try to get into
 451                          * TX_ON state without forcing. If the retries are
 452                          * higher or equal than AT86RF2XX_MAX_TX_RETRIES we
 453                          * will do a force change.
 454                          */
 455                         if (ctx->to_state == STATE_TX_ON ||
 456                             ctx->to_state == STATE_TRX_OFF) {
 457                                 u8 state = ctx->to_state;
 458
 459                                 if (lp->tx_retry >= AT86RF2XX_MAX_TX_RETRIES)
 460                                         state = STATE_FORCE_TRX_OFF;
 461                                 lp->tx_retry++;
 462
 463                                 at86rf230_async_state_change(lp, ctx, state,
 464                                                              ctx->complete);
 465                                 return;
 466                         }
 467                 }
 468
 469                 dev_warn(&lp->spi->dev, "unexcept state change from 0x%02x to 0x%02x. Actual state: 0x%02x\n",
 470                          ctx->from_state, ctx->to_state, trx_state);
 471         }
 472
 473 done:
 474         if (ctx->complete)
 475                 ctx->complete(context);
 476 }
 477
 478 static enum hrtimer_restart at86rf230_async_state_timer(struct hrtimer *timer)
 479 {
 480         struct at86rf230_state_change *ctx =
 481                 container_of(timer, struct at86rf230_state_change, timer);
 482         struct at86rf230_local *lp = ctx->lp;
 483
 484         at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 485                                  at86rf230_async_state_assert);
 486
 487         return HRTIMER_NORESTART;
 488 }
 489
 490 /* Do state change timing delay. */
 491 static void
 492 at86rf230_async_state_delay(void *context)
 493 {
 494         struct at86rf230_state_change *ctx = context;
 495         struct at86rf230_local *lp = ctx->lp;
 496         struct at86rf2xx_chip_data *c = lp->data;
 497         bool force = false;
 498         ktime_t tim;
 499
 500         /* The force state changes are will show as normal states in the
 501          * state status subregister. We change the to_state to the
 502          * corresponding one and remember if it was a force change, this
 503          * differs if we do a state change from STATE_BUSY_RX_AACK.
 504          */
 505         switch (ctx->to_state) {
 506         case STATE_FORCE_TX_ON:
 507                 ctx->to_state = STATE_TX_ON;
 508                 force = true;
 509                 break;
 510         case STATE_FORCE_TRX_OFF:
 511                 ctx->to_state = STATE_TRX_OFF;
 512                 force = true;
 513                 break;
 514         default:
 515                 break;
 516         }
 517
 518         switch (ctx->from_state) {
 519         case STATE_TRX_OFF:
 520                 switch (ctx->to_state) {
 521                 case STATE_RX_AACK_ON:
 522                         tim = ktime_set(0, c->t_off_to_aack * NSEC_PER_USEC);
 523                         /* state change from TRX_OFF to RX_AACK_ON to do a
 524                          * calibration, we need to reset the timeout for the
 525                          * next one.
 526                          */
 527                         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
 528                         goto change;
 529                 case STATE_TX_ARET_ON:
 530                 case STATE_TX_ON:
 531                         tim = ktime_set(0, c->t_off_to_tx_on * NSEC_PER_USEC);
 532                         /* state change from TRX_OFF to TX_ON or ARET_ON to do
 533                          * a calibration, we need to reset the timeout for the
 534                          * next one.
 535                          */
 536                         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
 537                         goto change;
 538                 default:
 539                         break;
 540                 }
 541                 break;
 542         case STATE_BUSY_RX_AACK:
 543                 switch (ctx->to_state) {
 544                 case STATE_TRX_OFF:
 545                 case STATE_TX_ON:
 546                         /* Wait for worst case receiving time if we
 547                          * didn't make a force change from BUSY_RX_AACK
 548                          * to TX_ON or TRX_OFF.
 549                          */
 550                         if (!force) {
 551                                 tim = ktime_set(0, (c->t_frame + c->t_p_ack) *
 552                                                    NSEC_PER_USEC);
 553                                 goto change;
 554                         }
 555                         break;
 556                 default:
 557                         break;
 558                 }
 559                 break;
 560         /* Default value, means RESET state */
 561         case STATE_P_ON:
 562                 switch (ctx->to_state) {
 563                 case STATE_TRX_OFF:
 564                         tim = ktime_set(0, c->t_reset_to_off * NSEC_PER_USEC);
 565                         goto change;
 566                 default:
 567                         break;
 568                 }
 569                 break;
 570         default:
 571                 break;
 572         }
 573
 574         /* Default delay is 1us in the most cases */
 575         udelay(1);
 576         at86rf230_async_state_timer(&ctx->timer);
 577         return;
 578
 579 change:
 580         hrtimer_start(&ctx->timer, tim, HRTIMER_MODE_REL);
 581 }
 582
 583 static void
 584 at86rf230_async_state_change_start(void *context)
 585 {
 586         struct at86rf230_state_change *ctx = context;
 587         struct at86rf230_local *lp = ctx->lp;
 588         u8 *buf = ctx->buf;
 589         const u8 trx_state = buf[1] & TRX_STATE_MASK;
 590
 591         /* Check for "possible" STATE_TRANSITION_IN_PROGRESS */
 592         if (trx_state == STATE_TRANSITION_IN_PROGRESS) {
 593                 udelay(1);
 594                 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 595                                          at86rf230_async_state_change_start);
 596                 return;
 597         }
 598
 599         /* Check if we already are in the state which we change in */
 600         if (trx_state == ctx->to_state) {
 601                 if (ctx->complete)
 602                         ctx->complete(context);
 603                 return;
 604         }
 605
 606         /* Set current state to the context of state change */
 607         ctx->from_state = trx_state;
 608
 609         /* Going into the next step for a state change which do a timing
 610          * relevant delay.
 611          */
 612         at86rf230_async_write_reg(lp, RG_TRX_STATE, ctx->to_state, ctx,
 613                                   at86rf230_async_state_delay);
 614 }
 615
 616 static void
 617 at86rf230_async_state_change(struct at86rf230_local *lp,
 618                              struct at86rf230_state_change *ctx,
 619                              const u8 state, void (*complete)(void *context))
 620 {
 621         /* Initialization for the state change context */
 622         ctx->to_state = state;
 623         ctx->complete = complete;
 624         at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 625                                  at86rf230_async_state_change_start);
 626 }
 627
 628 static void
 629 at86rf230_sync_state_change_complete(void *context)
 630 {
 631         struct at86rf230_state_change *ctx = context;
 632         struct at86rf230_local *lp = ctx->lp;
 633
 634         complete(&lp->state_complete);
 635 }
 636
 637 /* This function do a sync framework above the async state change.
 638  * Some callbacks of the IEEE 802.15.4 driver interface need to be
 639  * handled synchronously.
 640  */
 641 static int
 642 at86rf230_sync_state_change(struct at86rf230_local *lp, unsigned int state)
 643 {
 644         unsigned long rc;
 645
 646         at86rf230_async_state_change(lp, &lp->state, state,
 647                                      at86rf230_sync_state_change_complete);
 648
 649         rc = wait_for_completion_timeout(&lp->state_complete,
 650                                          msecs_to_jiffies(100));
 651         if (!rc) {
 652                 at86rf230_async_error(lp, &lp->state, -ETIMEDOUT);
 653                 return -ETIMEDOUT;
 654         }
 655
 656         return 0;
 657 }
 658
 659 static void
 660 at86rf230_tx_complete(void *context)
 661 {
 662         struct at86rf230_state_change *ctx = context;
 663         struct at86rf230_local *lp = ctx->lp;
 664
 665         ieee802154_xmit_complete(lp->hw, lp->tx_skb, false);
 666         kfree(ctx);
 667 }
 668
 669 static void
 670 at86rf230_tx_on(void *context)
 671 {
 672         struct at86rf230_state_change *ctx = context;
 673         struct at86rf230_local *lp = ctx->lp;
 674
 675         at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON,
 676                                      at86rf230_tx_complete);
 677 }
 678
 679 static void
 680 at86rf230_tx_trac_check(void *context)
 681 {
 682         struct at86rf230_state_change *ctx = context;
 683         struct at86rf230_local *lp = ctx->lp;
 684
 685         if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS)) {
 686                 u8 trac = TRAC_MASK(ctx->buf[1]);
 687
 688                 switch (trac) {
 689                 case TRAC_SUCCESS:
 690                         lp->trac.success++;
 691                         break;
 692                 case TRAC_SUCCESS_DATA_PENDING:
 693                         lp->trac.success_data_pending++;
 694                         break;
 695                 case TRAC_CHANNEL_ACCESS_FAILURE:
 696                         lp->trac.channel_access_failure++;
 697                         break;
 698                 case TRAC_NO_ACK:
 699                         lp->trac.no_ack++;
 700                         break;
 701                 case TRAC_INVALID:
 702                         lp->trac.invalid++;
 703                         break;
 704                 default:
 705                         WARN_ONCE(1, "received tx trac status %d\n", trac);
 706                         break;
 707                 }
 708         }
 709
 710         at86rf230_async_state_change(lp, ctx, STATE_TX_ON, at86rf230_tx_on);
 711 }
 712
 713 static void
 714 at86rf230_rx_read_frame_complete(void *context)
 715 {
 716         struct at86rf230_state_change *ctx = context;
 717         struct at86rf230_local *lp = ctx->lp;
 718         const u8 *buf = ctx->buf;
 719         struct sk_buff *skb;
 720         u8 len, lqi;
 721
 722         len = buf[1];
 723         if (!ieee802154_is_valid_psdu_len(len)) {
 724                 dev_vdbg(&lp->spi->dev, "corrupted frame received\n");
 725                 len = IEEE802154_MTU;
 726         }
 727         lqi = buf[2 + len];
 728
 729         skb = dev_alloc_skb(IEEE802154_MTU);
 730         if (!skb) {
 731                 dev_vdbg(&lp->spi->dev, "failed to allocate sk_buff\n");
 732                 kfree(ctx);
 733                 return;
 734         }
 735
 736         memcpy(skb_put(skb, len), buf + 2, len);
 737         ieee802154_rx_irqsafe(lp->hw, skb, lqi);
 738         kfree(ctx);
 739 }
 740
 741 static void
 742 at86rf230_rx_trac_check(void *context)
 743 {
 744         struct at86rf230_state_change *ctx = context;
 745         struct at86rf230_local *lp = ctx->lp;
 746         u8 *buf = ctx->buf;
 747         int rc;
 748
 749         if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS)) {
 750                 u8 trac = TRAC_MASK(buf[1]);
 751
 752                 switch (trac) {
 753                 case TRAC_SUCCESS:
 754                         lp->trac.success++;
 755                         break;
 756                 case TRAC_SUCCESS_WAIT_FOR_ACK:
 757                         lp->trac.success_wait_for_ack++;
 758                         break;
 759                 case TRAC_INVALID:
 760                         lp->trac.invalid++;
 761                         break;
 762                 default:
 763                         WARN_ONCE(1, "received rx trac status %d\n", trac);
 764                         break;
 765                 }
 766         }
 767
 768         buf[0] = CMD_FB;
 769         ctx->trx.len = AT86RF2XX_MAX_BUF;
 770         ctx->msg.complete = at86rf230_rx_read_frame_complete;
 771         rc = spi_async(lp->spi, &ctx->msg);
 772         if (rc) {
 773                 ctx->trx.len = 2;
 774                 at86rf230_async_error(lp, ctx, rc);
 775         }
 776 }
 777
 778 static void
 779 at86rf230_irq_trx_end(void *context)
 780 {
 781         struct at86rf230_state_change *ctx = context;
 782         struct at86rf230_local *lp = ctx->lp;
 783
 784         if (lp->is_tx) {
 785                 lp->is_tx = 0;
 786                 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx,
 787                                          at86rf230_tx_trac_check);
 788         } else {
 789                 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx,
 790                                          at86rf230_rx_trac_check);
 791         }
 792 }
 793
 794 static void
 795 at86rf230_irq_status(void *context)
 796 {
 797         struct at86rf230_state_change *ctx = context;
 798         struct at86rf230_local *lp = ctx->lp;
 799         const u8 *buf = ctx->buf;
 800         u8 irq = buf[1];
 801
 802         enable_irq(lp->spi->irq);
 803
 804         if (irq & IRQ_TRX_END) {
 805                 at86rf230_irq_trx_end(ctx);
 806         } else {
 807                 dev_err(&lp->spi->dev, "not supported irq %02x received\n",
 808                         irq);
 809                 kfree(ctx);
 810         }
 811 }
 812
 813 static void
 814 at86rf230_setup_spi_messages(struct at86rf230_local *lp,
 815                              struct at86rf230_state_change *state)
 816 {
 817         state->lp = lp;
 818         state->irq = lp->spi->irq;
 819         spi_message_init(&state->msg);
 820         state->msg.context = state;
 821         state->trx.len = 2;
 822         state->trx.tx_buf = state->buf;
 823         state->trx.rx_buf = state->buf;
 824         spi_message_add_tail(&state->trx, &state->msg);
 825         hrtimer_init(&state->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 826         state->timer.function = at86rf230_async_state_timer;
 827 }
 828
 829 static irqreturn_t at86rf230_isr(int irq, void *data)
 830 {
 831         struct at86rf230_local *lp = data;
 832         struct at86rf230_state_change *ctx;
 833         int rc;
 834
 835         disable_irq_nosync(irq);
 836
 837         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 838         if (!ctx) {
 839                 enable_irq(irq);
 840                 return IRQ_NONE;
 841         }
 842
 843         at86rf230_setup_spi_messages(lp, ctx);
 844         /* tell on error handling to free ctx */
 845         ctx->free = true;
 846
 847         ctx->buf[0] = (RG_IRQ_STATUS & CMD_REG_MASK) | CMD_REG;
 848         ctx->msg.complete = at86rf230_irq_status;
 849         rc = spi_async(lp->spi, &ctx->msg);
 850         if (rc) {
 851                 at86rf230_async_error(lp, ctx, rc);
 852                 enable_irq(irq);
 853                 return IRQ_NONE;
 854         }
 855
 856         return IRQ_HANDLED;
 857 }
 858
 859 static void
 860 at86rf230_write_frame_complete(void *context)
 861 {
 862         struct at86rf230_state_change *ctx = context;
 863         struct at86rf230_local *lp = ctx->lp;
 864
 865         ctx->trx.len = 2;
 866
 867         if (gpio_is_valid(lp->slp_tr))
 868                 at86rf230_slp_tr_rising_edge(lp);
 869         else
 870                 at86rf230_async_write_reg(lp, RG_TRX_STATE, STATE_BUSY_TX, ctx,
 871                                           NULL);
 872 }
 873
 874 static void
 875 at86rf230_write_frame(void *context)
 876 {
 877         struct at86rf230_state_change *ctx = context;
 878         struct at86rf230_local *lp = ctx->lp;
 879         struct sk_buff *skb = lp->tx_skb;
 880         u8 *buf = ctx->buf;
 881         int rc;
 882
 883         lp->is_tx = 1;
 884
 885         buf[0] = CMD_FB | CMD_WRITE;
 886         buf[1] = skb->len + 2;
 887         memcpy(buf + 2, skb->data, skb->len);
 888         ctx->trx.len = skb->len + 2;
 889         ctx->msg.complete = at86rf230_write_frame_complete;
 890         rc = spi_async(lp->spi, &ctx->msg);
 891         if (rc) {
 892                 ctx->trx.len = 2;
 893                 at86rf230_async_error(lp, ctx, rc);
 894         }
 895 }
 896
 897 static void
 898 at86rf230_xmit_tx_on(void *context)
 899 {
 900         struct at86rf230_state_change *ctx = context;
 901         struct at86rf230_local *lp = ctx->lp;
 902
 903         at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
 904                                      at86rf230_write_frame);
 905 }
 906
 907 static void
 908 at86rf230_xmit_start(void *context)
 909 {
 910         struct at86rf230_state_change *ctx = context;
 911         struct at86rf230_local *lp = ctx->lp;
 912
 913         /* check if we change from off state */
 914         if (lp->is_tx_from_off)
 915                 at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
 916                                              at86rf230_write_frame);
 917         else
 918                 at86rf230_async_state_change(lp, ctx, STATE_TX_ON,
 919                                              at86rf230_xmit_tx_on);
 920 }
 921
 922 static int
 923 at86rf230_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
 924 {
 925         struct at86rf230_local *lp = hw->priv;
 926         struct at86rf230_state_change *ctx = &lp->tx;
 927
 928         lp->tx_skb = skb;
 929         lp->tx_retry = 0;
 930
 931         /* After 5 minutes in PLL and the same frequency we run again the
 932          * calibration loops which is recommended by at86rf2xx datasheets.
 933          *
 934          * The calibration is initiate by a state change from TRX_OFF
 935          * to TX_ON, the lp->cal_timeout should be reinit by state_delay
 936          * function then to start in the next 5 minutes.
 937          */
 938         if (time_is_before_jiffies(lp->cal_timeout)) {
 939                 lp->is_tx_from_off = true;
 940                 at86rf230_async_state_change(lp, ctx, STATE_TRX_OFF,
 941                                              at86rf230_xmit_start);
 942         } else {
 943                 lp->is_tx_from_off = false;
 944                 at86rf230_xmit_start(ctx);
 945         }
 946
 947         return 0;
 948 }
 949
 950 static int
 951 at86rf230_ed(struct ieee802154_hw *hw, u8 *level)
 952 {
 953         WARN_ON(!level);
 954         *level = 0xbe;
 955         return 0;
 956 }
 957
 958 static int
 959 at86rf230_start(struct ieee802154_hw *hw)
 960 {
 961         struct at86rf230_local *lp = hw->priv;
 962
 963         /* reset trac stats on start */
 964         if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS))
 965                 memset(&lp->trac, 0, sizeof(struct at86rf230_trac));
 966
 967         at86rf230_awake(lp);
 968         enable_irq(lp->spi->irq);
 969
 970         return at86rf230_sync_state_change(lp, STATE_RX_AACK_ON);
 971 }
 972
 973 static void
 974 at86rf230_stop(struct ieee802154_hw *hw)
 975 {
 976         struct at86rf230_local *lp = hw->priv;
 977         u8 csma_seed[2];
 978
 979         at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
 980
 981         disable_irq(lp->spi->irq);
 982
 983         /* It's recommended to set random new csma_seeds before sleep state.
 984          * Makes only sense in the stop callback, not doing this inside of
 985          * at86rf230_sleep, this is also used when we don't transmit afterwards
 986          * when calling start callback again.
 987          */
 988         get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
 989         at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
 990         at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
 991
 992         at86rf230_sleep(lp);
 993 }
 994
 995 static int
 996 at86rf23x_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
 997 {
 998         return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
 999 }
1000
1001 #define AT86RF2XX_MAX_ED_LEVELS 0xF
1002 static const s32 at86rf23x_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = {
1003         -9100, -8900, -8700, -8500, -8300, -8100, -7900, -7700, -7500, -7300,
1004         -7100, -6900, -6700, -6500, -6300, -6100,
1005 };
1006
1007 static const s32 at86rf212_ed_levels_100[AT86RF2XX_MAX_ED_LEVELS + 1] = {
1008         -10000, -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200,
1009         -8000, -7800, -7600, -7400, -7200, -7000,
1010 };
1011
1012 static const s32 at86rf212_ed_levels_98[AT86RF2XX_MAX_ED_LEVELS + 1] = {
1013         -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000,
1014         -7800, -7600, -7400, -7200, -7000, -6800,
1015 };
1016
1017 static inline int
1018 at86rf212_update_cca_ed_level(struct at86rf230_local *lp, int rssi_base_val)
1019 {
1020         unsigned int cca_ed_thres;
1021         int rc;
1022
1023         rc = at86rf230_read_subreg(lp, SR_CCA_ED_THRES, &cca_ed_thres);
1024         if (rc < 0)
1025                 return rc;
1026
1027         switch (rssi_base_val) {
1028         case -98:
1029                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_98;
1030                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_98);
1031                 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_98[cca_ed_thres];
1032                 break;
1033         case -100:
1034                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
1035                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
1036                 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_100[cca_ed_thres];
1037                 break;
1038         default:
1039                 WARN_ON(1);
1040         }
1041
1042         return 0;
1043 }
1044
1045 static int
1046 at86rf212_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
1047 {
1048         int rc;
1049
1050         if (channel == 0)
1051                 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 0);
1052         else
1053                 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 1);
1054         if (rc < 0)
1055                 return rc;
1056
1057         if (page == 0) {
1058                 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 0);
1059                 lp->data->rssi_base_val = -100;
1060         } else {
1061                 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 1);
1062                 lp->data->rssi_base_val = -98;
1063         }
1064         if (rc < 0)
1065                 return rc;
1066
1067         rc = at86rf212_update_cca_ed_level(lp, lp->data->rssi_base_val);
1068         if (rc < 0)
1069                 return rc;
1070
1071         /* This sets the symbol_duration according frequency on the 212.
1072          * TODO move this handling while set channel and page in cfg802154.
1073          * We can do that, this timings are according 802.15.4 standard.
1074          * If we do that in cfg802154, this is a more generic calculation.
1075          *
1076          * This should also protected from ifs_timer. Means cancel timer and
1077          * init with a new value. For now, this is okay.
1078          */
1079         if (channel == 0) {
1080                 if (page == 0) {
1081                         /* SUB:0 and BPSK:0 -> BPSK-20 */
1082                         lp->hw->phy->symbol_duration = 50;
1083                 } else {
1084                         /* SUB:1 and BPSK:0 -> BPSK-40 */
1085                         lp->hw->phy->symbol_duration = 25;
1086                 }
1087         } else {
1088                 if (page == 0)
1089                         /* SUB:0 and BPSK:1 -> OQPSK-100/200/400 */
1090                         lp->hw->phy->symbol_duration = 40;
1091                 else
1092                         /* SUB:1 and BPSK:1 -> OQPSK-250/500/1000 */
1093                         lp->hw->phy->symbol_duration = 16;
1094         }
1095
1096         lp->hw->phy->lifs_period = IEEE802154_LIFS_PERIOD *
1097                                    lp->hw->phy->symbol_duration;
1098         lp->hw->phy->sifs_period = IEEE802154_SIFS_PERIOD *
1099                                    lp->hw->phy->symbol_duration;
1100
1101         return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
1102 }
1103
1104 static int
1105 at86rf230_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
1106 {
1107         struct at86rf230_local *lp = hw->priv;
1108         int rc;
1109
1110         rc = lp->data->set_channel(lp, page, channel);
1111         /* Wait for PLL */
1112         usleep_range(lp->data->t_channel_switch,
1113                      lp->data->t_channel_switch + 10);
1114
1115         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
1116         return rc;
1117 }
1118
1119 static int
1120 at86rf230_set_hw_addr_filt(struct ieee802154_hw *hw,
1121                            struct ieee802154_hw_addr_filt *filt,
1122                            unsigned long changed)
1123 {
1124         struct at86rf230_local *lp = hw->priv;
1125
1126         if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
1127                 u16 addr = le16_to_cpu(filt->short_addr);
1128
1129                 dev_vdbg(&lp->spi->dev, "%s called for saddr\n", __func__);
1130                 __at86rf230_write(lp, RG_SHORT_ADDR_0, addr);
1131                 __at86rf230_write(lp, RG_SHORT_ADDR_1, addr >> 8);
1132         }
1133
1134         if (changed & IEEE802154_AFILT_PANID_CHANGED) {
1135                 u16 pan = le16_to_cpu(filt->pan_id);
1136
1137                 dev_vdbg(&lp->spi->dev, "%s called for pan id\n", __func__);
1138                 __at86rf230_write(lp, RG_PAN_ID_0, pan);
1139                 __at86rf230_write(lp, RG_PAN_ID_1, pan >> 8);
1140         }
1141
1142         if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
1143                 u8 i, addr[8];
1144
1145                 memcpy(addr, &filt->ieee_addr, 8);
1146                 dev_vdbg(&lp->spi->dev, "%s called for IEEE addr\n", __func__);
1147                 for (i = 0; i < 8; i++)
1148                         __at86rf230_write(lp, RG_IEEE_ADDR_0 + i, addr[i]);
1149         }
1150
1151         if (changed & IEEE802154_AFILT_PANC_CHANGED) {
1152                 dev_vdbg(&lp->spi->dev, "%s called for panc change\n", __func__);
1153                 if (filt->pan_coord)
1154                         at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 1);
1155                 else
1156                         at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 0);
1157         }
1158
1159         return 0;
1160 }
1161
1162 #define AT86RF23X_MAX_TX_POWERS 0xF
1163 static const s32 at86rf233_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1164         400, 370, 340, 300, 250, 200, 100, 0, -100, -200, -300, -400, -600,
1165         -800, -1200, -1700,
1166 };
1167
1168 static const s32 at86rf231_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1169         300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700,
1170         -900, -1200, -1700,
1171 };
1172
1173 #define AT86RF212_MAX_TX_POWERS 0x1F
1174 static const s32 at86rf212_powers[AT86RF212_MAX_TX_POWERS + 1] = {
1175         500, 400, 300, 200, 100, 0, -100, -200, -300, -400, -500, -600, -700,
1176         -800, -900, -1000, -1100, -1200, -1300, -1400, -1500, -1600, -1700,
1177         -1800, -1900, -2000, -2100, -2200, -2300, -2400, -2500, -2600,
1178 };
1179
1180 static int
1181 at86rf23x_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_23X, i);
1188         }
1189
1190         return -EINVAL;
1191 }
1192
1193 static int
1194 at86rf212_set_txpower(struct at86rf230_local *lp, s32 mbm)
1195 {
1196         u32 i;
1197
1198         for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1199                 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1200                         return at86rf230_write_subreg(lp, SR_TX_PWR_212, i);
1201         }
1202
1203         return -EINVAL;
1204 }
1205
1206 static int
1207 at86rf230_set_txpower(struct ieee802154_hw *hw, s32 mbm)
1208 {
1209         struct at86rf230_local *lp = hw->priv;
1210
1211         return lp->data->set_txpower(lp, mbm);
1212 }
1213
1214 static int
1215 at86rf230_set_lbt(struct ieee802154_hw *hw, bool on)
1216 {
1217         struct at86rf230_local *lp = hw->priv;
1218
1219         return at86rf230_write_subreg(lp, SR_CSMA_LBT_MODE, on);
1220 }
1221
1222 static int
1223 at86rf230_set_cca_mode(struct ieee802154_hw *hw,
1224                        const struct wpan_phy_cca *cca)
1225 {
1226         struct at86rf230_local *lp = hw->priv;
1227         u8 val;
1228
1229         /* mapping 802.15.4 to driver spec */
1230         switch (cca->mode) {
1231         case NL802154_CCA_ENERGY:
1232                 val = 1;
1233                 break;
1234         case NL802154_CCA_CARRIER:
1235                 val = 2;
1236                 break;
1237         case NL802154_CCA_ENERGY_CARRIER:
1238                 switch (cca->opt) {
1239                 case NL802154_CCA_OPT_ENERGY_CARRIER_AND:
1240                         val = 3;
1241                         break;
1242                 case NL802154_CCA_OPT_ENERGY_CARRIER_OR:
1243                         val = 0;
1244                         break;
1245                 default:
1246                         return -EINVAL;
1247                 }
1248                 break;
1249         default:
1250                 return -EINVAL;
1251         }
1252
1253         return at86rf230_write_subreg(lp, SR_CCA_MODE, val);
1254 }
1255
1256 static int
1257 at86rf230_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
1258 {
1259         struct at86rf230_local *lp = hw->priv;
1260         u32 i;
1261
1262         for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) {
1263                 if (hw->phy->supported.cca_ed_levels[i] == mbm)
1264                         return at86rf230_write_subreg(lp, SR_CCA_ED_THRES, i);
1265         }
1266
1267         return -EINVAL;
1268 }
1269
1270 static int
1271 at86rf230_set_csma_params(struct ieee802154_hw *hw, u8 min_be, u8 max_be,
1272                           u8 retries)
1273 {
1274         struct at86rf230_local *lp = hw->priv;
1275         int rc;
1276
1277         rc = at86rf230_write_subreg(lp, SR_MIN_BE, min_be);
1278         if (rc)
1279                 return rc;
1280
1281         rc = at86rf230_write_subreg(lp, SR_MAX_BE, max_be);
1282         if (rc)
1283                 return rc;
1284
1285         return at86rf230_write_subreg(lp, SR_MAX_CSMA_RETRIES, retries);
1286 }
1287
1288 static int
1289 at86rf230_set_frame_retries(struct ieee802154_hw *hw, s8 retries)
1290 {
1291         struct at86rf230_local *lp = hw->priv;
1292
1293         return at86rf230_write_subreg(lp, SR_MAX_FRAME_RETRIES, retries);
1294 }
1295
1296 static int
1297 at86rf230_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
1298 {
1299         struct at86rf230_local *lp = hw->priv;
1300         int rc;
1301
1302         if (on) {
1303                 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 1);
1304                 if (rc < 0)
1305                         return rc;
1306
1307                 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 1);
1308                 if (rc < 0)
1309                         return rc;
1310         } else {
1311                 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 0);
1312                 if (rc < 0)
1313                         return rc;
1314
1315                 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 0);
1316                 if (rc < 0)
1317                         return rc;
1318         }
1319
1320         return 0;
1321 }
1322
1323 static const struct ieee802154_ops at86rf230_ops = {
1324         .owner = THIS_MODULE,
1325         .xmit_async = at86rf230_xmit,
1326         .ed = at86rf230_ed,
1327         .set_channel = at86rf230_channel,
1328         .start = at86rf230_start,
1329         .stop = at86rf230_stop,
1330         .set_hw_addr_filt = at86rf230_set_hw_addr_filt,
1331         .set_txpower = at86rf230_set_txpower,
1332         .set_lbt = at86rf230_set_lbt,
1333         .set_cca_mode = at86rf230_set_cca_mode,
1334         .set_cca_ed_level = at86rf230_set_cca_ed_level,
1335         .set_csma_params = at86rf230_set_csma_params,
1336         .set_frame_retries = at86rf230_set_frame_retries,
1337         .set_promiscuous_mode = at86rf230_set_promiscuous_mode,
1338 };
1339
1340 static struct at86rf2xx_chip_data at86rf233_data = {
1341         .t_sleep_cycle = 330,
1342         .t_channel_switch = 11,
1343         .t_reset_to_off = 26,
1344         .t_off_to_aack = 80,
1345         .t_off_to_tx_on = 80,
1346         .t_off_to_sleep = 35,
1347         .t_sleep_to_off = 1000,
1348         .t_frame = 4096,
1349         .t_p_ack = 545,
1350         .rssi_base_val = -91,
1351         .set_channel = at86rf23x_set_channel,
1352         .set_txpower = at86rf23x_set_txpower,
1353 };
1354
1355 static struct at86rf2xx_chip_data at86rf231_data = {
1356         .t_sleep_cycle = 330,
1357         .t_channel_switch = 24,
1358         .t_reset_to_off = 37,
1359         .t_off_to_aack = 110,
1360         .t_off_to_tx_on = 110,
1361         .t_off_to_sleep = 35,
1362         .t_sleep_to_off = 1000,
1363         .t_frame = 4096,
1364         .t_p_ack = 545,
1365         .rssi_base_val = -91,
1366         .set_channel = at86rf23x_set_channel,
1367         .set_txpower = at86rf23x_set_txpower,
1368 };
1369
1370 static struct at86rf2xx_chip_data at86rf212_data = {
1371         .t_sleep_cycle = 330,
1372         .t_channel_switch = 11,
1373         .t_reset_to_off = 26,
1374         .t_off_to_aack = 200,
1375         .t_off_to_tx_on = 200,
1376         .t_off_to_sleep = 35,
1377         .t_sleep_to_off = 1000,
1378         .t_frame = 4096,
1379         .t_p_ack = 545,
1380         .rssi_base_val = -100,
1381         .set_channel = at86rf212_set_channel,
1382         .set_txpower = at86rf212_set_txpower,
1383 };
1384
1385 static int at86rf230_hw_init(struct at86rf230_local *lp, u8 xtal_trim)
1386 {
1387         int rc, irq_type, irq_pol = IRQ_ACTIVE_HIGH;
1388         unsigned int dvdd;
1389         u8 csma_seed[2];
1390
1391         rc = at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
1392         if (rc)
1393                 return rc;
1394
1395         irq_type = irq_get_trigger_type(lp->spi->irq);
1396         if (irq_type == IRQ_TYPE_EDGE_FALLING ||
1397             irq_type == IRQ_TYPE_LEVEL_LOW)
1398                 irq_pol = IRQ_ACTIVE_LOW;
1399
1400         rc = at86rf230_write_subreg(lp, SR_IRQ_POLARITY, irq_pol);
1401         if (rc)
1402                 return rc;
1403
1404         rc = at86rf230_write_subreg(lp, SR_RX_SAFE_MODE, 1);
1405         if (rc)
1406                 return rc;
1407
1408         rc = at86rf230_write_subreg(lp, SR_IRQ_MASK, IRQ_TRX_END);
1409         if (rc)
1410                 return rc;
1411
1412         /* reset values differs in at86rf231 and at86rf233 */
1413         rc = at86rf230_write_subreg(lp, SR_IRQ_MASK_MODE, 0);
1414         if (rc)
1415                 return rc;
1416
1417         get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
1418         rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
1419         if (rc)
1420                 return rc;
1421         rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
1422         if (rc)
1423                 return rc;
1424
1425         /* CLKM changes are applied immediately */
1426         rc = at86rf230_write_subreg(lp, SR_CLKM_SHA_SEL, 0x00);
1427         if (rc)
1428                 return rc;
1429
1430         /* Turn CLKM Off */
1431         rc = at86rf230_write_subreg(lp, SR_CLKM_CTRL, 0x00);
1432         if (rc)
1433                 return rc;
1434         /* Wait the next SLEEP cycle */
1435         usleep_range(lp->data->t_sleep_cycle,
1436                      lp->data->t_sleep_cycle + 100);
1437
1438         /* xtal_trim value is calculated by:
1439          * CL = 0.5 * (CX + CTRIM + CPAR)
1440          *
1441          * whereas:
1442          * CL = capacitor of used crystal
1443          * CX = connected capacitors at xtal pins
1444          * CPAR = in all at86rf2xx datasheets this is a constant value 3 pF,
1445          *        but this is different on each board setup. You need to fine
1446          *        tuning this value via CTRIM.
1447          * CTRIM = variable capacitor setting. Resolution is 0.3 pF range is
1448          *         0 pF upto 4.5 pF.
1449          *
1450          * Examples:
1451          * atben transceiver:
1452          *
1453          * CL = 8 pF
1454          * CX = 12 pF
1455          * CPAR = 3 pF (We assume the magic constant from datasheet)
1456          * CTRIM = 0.9 pF
1457          *
1458          * (12+0.9+3)/2 = 7.95 which is nearly at 8 pF
1459          *
1460          * xtal_trim = 0x3
1461          *
1462          * openlabs transceiver:
1463          *
1464          * CL = 16 pF
1465          * CX = 22 pF
1466          * CPAR = 3 pF (We assume the magic constant from datasheet)
1467          * CTRIM = 4.5 pF
1468          *
1469          * (22+4.5+3)/2 = 14.75 which is the nearest value to 16 pF
1470          *
1471          * xtal_trim = 0xf
1472          */
1473         rc = at86rf230_write_subreg(lp, SR_XTAL_TRIM, xtal_trim);
1474         if (rc)
1475                 return rc;
1476
1477         rc = at86rf230_read_subreg(lp, SR_DVDD_OK, &dvdd);
1478         if (rc)
1479                 return rc;
1480         if (!dvdd) {
1481                 dev_err(&lp->spi->dev, "DVDD error\n");
1482                 return -EINVAL;
1483         }
1484
1485         /* Force setting slotted operation bit to 0. Sometimes the atben
1486          * sets this bit and I don't know why. We set this always force
1487          * to zero while probing.
1488          */
1489         return at86rf230_write_subreg(lp, SR_SLOTTED_OPERATION, 0);
1490 }
1491
1492 static int
1493 at86rf230_get_pdata(struct spi_device *spi, int *rstn, int *slp_tr,
1494                     u8 *xtal_trim)
1495 {
1496         struct at86rf230_platform_data *pdata = spi->dev.platform_data;
1497         int ret;
1498
1499         if (!IS_ENABLED(CONFIG_OF) || !spi->dev.of_node) {
1500                 if (!pdata)
1501                         return -ENOENT;
1502
1503                 *rstn = pdata->rstn;
1504                 *slp_tr = pdata->slp_tr;
1505                 *xtal_trim = pdata->xtal_trim;
1506                 return 0;
1507         }
1508
1509         *rstn = of_get_named_gpio(spi->dev.of_node, "reset-gpio", 0);
1510         *slp_tr = of_get_named_gpio(spi->dev.of_node, "sleep-gpio", 0);
1511         ret = of_property_read_u8(spi->dev.of_node, "xtal-trim", xtal_trim);
1512         if (ret < 0 && ret != -EINVAL)
1513                 return ret;
1514
1515         return 0;
1516 }
1517
1518 static int
1519 at86rf230_detect_device(struct at86rf230_local *lp)
1520 {
1521         unsigned int part, version, val;
1522         u16 man_id = 0;
1523         const char *chip;
1524         int rc;
1525
1526         rc = __at86rf230_read(lp, RG_MAN_ID_0, &val);
1527         if (rc)
1528                 return rc;
1529         man_id |= val;
1530
1531         rc = __at86rf230_read(lp, RG_MAN_ID_1, &val);
1532         if (rc)
1533                 return rc;
1534         man_id |= (val << 8);
1535
1536         rc = __at86rf230_read(lp, RG_PART_NUM, &part);
1537         if (rc)
1538                 return rc;
1539
1540         rc = __at86rf230_read(lp, RG_VERSION_NUM, &version);
1541         if (rc)
1542                 return rc;
1543
1544         if (man_id != 0x001f) {
1545                 dev_err(&lp->spi->dev, "Non-Atmel dev found (MAN_ID %02x %02x)\n",
1546                         man_id >> 8, man_id & 0xFF);
1547                 return -EINVAL;
1548         }
1549
1550         lp->hw->flags = IEEE802154_HW_TX_OMIT_CKSUM |
1551                         IEEE802154_HW_CSMA_PARAMS |
1552                         IEEE802154_HW_FRAME_RETRIES | IEEE802154_HW_AFILT |
1553                         IEEE802154_HW_PROMISCUOUS;
1554
1555         lp->hw->phy->flags = WPAN_PHY_FLAG_TXPOWER |
1556                              WPAN_PHY_FLAG_CCA_ED_LEVEL |
1557                              WPAN_PHY_FLAG_CCA_MODE;
1558
1559         lp->hw->phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY) |
1560                 BIT(NL802154_CCA_CARRIER) | BIT(NL802154_CCA_ENERGY_CARRIER);
1561         lp->hw->phy->supported.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND) |
1562                 BIT(NL802154_CCA_OPT_ENERGY_CARRIER_OR);
1563
1564         lp->hw->phy->supported.cca_ed_levels = at86rf23x_ed_levels;
1565         lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf23x_ed_levels);
1566
1567         lp->hw->phy->cca.mode = NL802154_CCA_ENERGY;
1568
1569         switch (part) {
1570         case 2:
1571                 chip = "at86rf230";
1572                 rc = -ENOTSUPP;
1573                 goto not_supp;
1574         case 3:
1575                 chip = "at86rf231";
1576                 lp->data = &at86rf231_data;
1577                 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1578                 lp->hw->phy->current_channel = 11;
1579                 lp->hw->phy->symbol_duration = 16;
1580                 lp->hw->phy->supported.tx_powers = at86rf231_powers;
1581                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf231_powers);
1582                 break;
1583         case 7:
1584                 chip = "at86rf212";
1585                 lp->data = &at86rf212_data;
1586                 lp->hw->flags |= IEEE802154_HW_LBT;
1587                 lp->hw->phy->supported.channels[0] = 0x00007FF;
1588                 lp->hw->phy->supported.channels[2] = 0x00007FF;
1589                 lp->hw->phy->current_channel = 5;
1590                 lp->hw->phy->symbol_duration = 25;
1591                 lp->hw->phy->supported.lbt = NL802154_SUPPORTED_BOOL_BOTH;
1592                 lp->hw->phy->supported.tx_powers = at86rf212_powers;
1593                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf212_powers);
1594                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
1595                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
1596                 break;
1597         case 11:
1598                 chip = "at86rf233";
1599                 lp->data = &at86rf233_data;
1600                 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1601                 lp->hw->phy->current_channel = 13;
1602                 lp->hw->phy->symbol_duration = 16;
1603                 lp->hw->phy->supported.tx_powers = at86rf233_powers;
1604                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf233_powers);
1605                 break;
1606         default:
1607                 chip = "unknown";
1608                 rc = -ENOTSUPP;
1609                 goto not_supp;
1610         }
1611
1612         lp->hw->phy->cca_ed_level = lp->hw->phy->supported.cca_ed_levels[7];
1613         lp->hw->phy->transmit_power = lp->hw->phy->supported.tx_powers[0];
1614
1615 not_supp:
1616         dev_info(&lp->spi->dev, "Detected %s chip version %d\n", chip, version);
1617
1618         return rc;
1619 }
1620
1621 #ifdef CONFIG_IEEE802154_AT86RF230_DEBUGFS
1622 static struct dentry *at86rf230_debugfs_root;
1623
1624 static int at86rf230_stats_show(struct seq_file *file, void *offset)
1625 {
1626         struct at86rf230_local *lp = file->private;
1627
1628         seq_printf(file, "SUCCESS:\t\t%8llu\n", lp->trac.success);
1629         seq_printf(file, "SUCCESS_DATA_PENDING:\t%8llu\n",
1630                    lp->trac.success_data_pending);
1631         seq_printf(file, "SUCCESS_WAIT_FOR_ACK:\t%8llu\n",
1632                    lp->trac.success_wait_for_ack);
1633         seq_printf(file, "CHANNEL_ACCESS_FAILURE:\t%8llu\n",
1634                    lp->trac.channel_access_failure);
1635         seq_printf(file, "NO_ACK:\t\t\t%8llu\n", lp->trac.no_ack);
1636         seq_printf(file, "INVALID:\t\t%8llu\n", lp->trac.invalid);
1637         return 0;
1638 }
1639
1640 static int at86rf230_stats_open(struct inode *inode, struct file *file)
1641 {
1642         return single_open(file, at86rf230_stats_show, inode->i_private);
1643 }
1644
1645 static const struct file_operations at86rf230_stats_fops = {
1646         .open           = at86rf230_stats_open,
1647         .read           = seq_read,
1648         .llseek         = seq_lseek,
1649         .release        = single_release,
1650 };
1651
1652 static int at86rf230_debugfs_init(struct at86rf230_local *lp)
1653 {
1654         char debugfs_dir_name[DNAME_INLINE_LEN + 1] = "at86rf230-";
1655         struct dentry *stats;
1656
1657         strncat(debugfs_dir_name, dev_name(&lp->spi->dev), DNAME_INLINE_LEN);
1658
1659         at86rf230_debugfs_root = debugfs_create_dir(debugfs_dir_name, NULL);
1660         if (!at86rf230_debugfs_root)
1661                 return -ENOMEM;
1662
1663         stats = debugfs_create_file("trac_stats", S_IRUGO,
1664                                     at86rf230_debugfs_root, lp,
1665                                     &at86rf230_stats_fops);
1666         if (!stats)
1667                 return -ENOMEM;
1668
1669         return 0;
1670 }
1671
1672 static void at86rf230_debugfs_remove(void)
1673 {
1674         debugfs_remove_recursive(at86rf230_debugfs_root);
1675 }
1676 #else
1677 static int at86rf230_debugfs_init(struct at86rf230_local *lp) { return 0; }
1678 static void at86rf230_debugfs_remove(void) { }
1679 #endif
1680
1681 static int at86rf230_probe(struct spi_device *spi)
1682 {
1683         struct ieee802154_hw *hw;
1684         struct at86rf230_local *lp;
1685         unsigned int status;
1686         int rc, irq_type, rstn, slp_tr;
1687         u8 xtal_trim = 0;
1688
1689         if (!spi->irq) {
1690                 dev_err(&spi->dev, "no IRQ specified\n");
1691                 return -EINVAL;
1692         }
1693
1694         rc = at86rf230_get_pdata(spi, &rstn, &slp_tr, &xtal_trim);
1695         if (rc < 0) {
1696                 dev_err(&spi->dev, "failed to parse platform_data: %d\n", rc);
1697                 return rc;
1698         }
1699
1700         if (gpio_is_valid(rstn)) {
1701                 rc = devm_gpio_request_one(&spi->dev, rstn,
1702                                            GPIOF_OUT_INIT_HIGH, "rstn");
1703                 if (rc)
1704                         return rc;
1705         }
1706
1707         if (gpio_is_valid(slp_tr)) {
1708                 rc = devm_gpio_request_one(&spi->dev, slp_tr,
1709                                            GPIOF_OUT_INIT_LOW, "slp_tr");
1710                 if (rc)
1711                         return rc;
1712         }
1713
1714         /* Reset */
1715         if (gpio_is_valid(rstn)) {
1716                 udelay(1);
1717                 gpio_set_value(rstn, 0);
1718                 udelay(1);
1719                 gpio_set_value(rstn, 1);
1720                 usleep_range(120, 240);
1721         }
1722
1723         hw = ieee802154_alloc_hw(sizeof(*lp), &at86rf230_ops);
1724         if (!hw)
1725                 return -ENOMEM;
1726
1727         lp = hw->priv;
1728         lp->hw = hw;
1729         lp->spi = spi;
1730         lp->slp_tr = slp_tr;
1731         hw->parent = &spi->dev;
1732         ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
1733
1734         lp->regmap = devm_regmap_init_spi(spi, &at86rf230_regmap_spi_config);
1735         if (IS_ERR(lp->regmap)) {
1736                 rc = PTR_ERR(lp->regmap);
1737                 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
1738                         rc);
1739                 goto free_dev;
1740         }
1741
1742         at86rf230_setup_spi_messages(lp, &lp->state);
1743         at86rf230_setup_spi_messages(lp, &lp->tx);
1744
1745         rc = at86rf230_detect_device(lp);
1746         if (rc < 0)
1747                 goto free_dev;
1748
1749         init_completion(&lp->state_complete);
1750
1751         spi_set_drvdata(spi, lp);
1752
1753         rc = at86rf230_hw_init(lp, xtal_trim);
1754         if (rc)
1755                 goto free_dev;
1756
1757         /* Read irq status register to reset irq line */
1758         rc = at86rf230_read_subreg(lp, RG_IRQ_STATUS, 0xff, 0, &status);
1759         if (rc)
1760                 goto free_dev;
1761
1762         irq_type = irq_get_trigger_type(spi->irq);
1763         if (!irq_type)
1764                 irq_type = IRQF_TRIGGER_HIGH;
1765
1766         rc = devm_request_irq(&spi->dev, spi->irq, at86rf230_isr,
1767                               IRQF_SHARED | irq_type, dev_name(&spi->dev), lp);
1768         if (rc)
1769                 goto free_dev;
1770
1771         /* disable_irq by default and wait for starting hardware */
1772         disable_irq(spi->irq);
1773
1774         /* going into sleep by default */
1775         at86rf230_sleep(lp);
1776
1777         rc = at86rf230_debugfs_init(lp);
1778         if (rc)
1779                 goto free_dev;
1780
1781         rc = ieee802154_register_hw(lp->hw);
1782         if (rc)
1783                 goto free_debugfs;
1784
1785         return rc;
1786
1787 free_debugfs:
1788         at86rf230_debugfs_remove();
1789 free_dev:
1790         ieee802154_free_hw(lp->hw);
1791
1792         return rc;
1793 }
1794
1795 static int at86rf230_remove(struct spi_device *spi)
1796 {
1797         struct at86rf230_local *lp = spi_get_drvdata(spi);
1798
1799         /* mask all at86rf230 irq's */
1800         at86rf230_write_subreg(lp, SR_IRQ_MASK, 0);
1801         ieee802154_unregister_hw(lp->hw);
1802         ieee802154_free_hw(lp->hw);
1803         at86rf230_debugfs_remove();
1804         dev_dbg(&spi->dev, "unregistered at86rf230\n");
1805
1806         return 0;
1807 }
1808
1809 static const struct of_device_id at86rf230_of_match[] = {
1810         { .compatible = "atmel,at86rf230", },
1811         { .compatible = "atmel,at86rf231", },
1812         { .compatible = "atmel,at86rf233", },
1813         { .compatible = "atmel,at86rf212", },
1814         { },
1815 };
1816 MODULE_DEVICE_TABLE(of, at86rf230_of_match);
1817
1818 static const struct spi_device_id at86rf230_device_id[] = {
1819         { .name = "at86rf230", },
1820         { .name = "at86rf231", },
1821         { .name = "at86rf233", },
1822         { .name = "at86rf212", },
1823         { },
1824 };
1825 MODULE_DEVICE_TABLE(spi, at86rf230_device_id);
1826
1827 static struct spi_driver at86rf230_driver = {
1828         .id_table = at86rf230_device_id,
1829         .driver = {
1830                 .of_match_table = of_match_ptr(at86rf230_of_match),
1831                 .name   = "at86rf230",
1832         },
1833         .probe      = at86rf230_probe,
1834         .remove     = at86rf230_remove,
1835 };
1836
1837 module_spi_driver(at86rf230_driver);
1838
1839 MODULE_DESCRIPTION("AT86RF230 Transceiver Driver");
1840 MODULE_LICENSE("GPL v2");