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/gpio/consumer.h>
  15 #include <linux/hrtimer.h>
  16 #include <linux/jiffies.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/irq.h>
  19 #include <linux/delay.h>
  20 #include <linux/property.h>
  21 #include <linux/spi/spi.h>
  22 #include <linux/regmap.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/ieee802154.h>
  25
  26 #include <net/mac802154.h>
  27 #include <net/cfg802154.h>
  28
  29 #include "at86rf230.h"
  30
  31 struct at86rf230_local;
  32 /* at86rf2xx chip depend data.
  33  * All timings are in us.
  34  */
  35 struct at86rf2xx_chip_data {
  36         u16 t_sleep_cycle;
  37         u16 t_channel_switch;
  38         u16 t_reset_to_off;
  39         u16 t_off_to_aack;
  40         u16 t_off_to_tx_on;
  41         u16 t_off_to_sleep;
  42         u16 t_sleep_to_off;
  43         u16 t_frame;
  44         u16 t_p_ack;
  45         int rssi_base_val;
  46
  47         int (*set_channel)(struct at86rf230_local *, u8, u8);
  48         int (*set_txpower)(struct at86rf230_local *, s32);
  49 };
  50
  51 #define AT86RF2XX_MAX_BUF               (127 + 3)
  52 /* tx retries to access the TX_ON state
  53  * if it's above then force change will be started.
  54  *
  55  * We assume the max_frame_retries (7) value of 802.15.4 here.
  56  */
  57 #define AT86RF2XX_MAX_TX_RETRIES        7
  58 /* We use the recommended 5 minutes timeout to recalibrate */
  59 #define AT86RF2XX_CAL_LOOP_TIMEOUT      (5 * 60 * HZ)
  60
  61 struct at86rf230_state_change {
  62         struct at86rf230_local *lp;
  63         int irq;
  64
  65         struct hrtimer timer;
  66         struct spi_message msg;
  67         struct spi_transfer trx;
  68         u8 buf[AT86RF2XX_MAX_BUF];
  69
  70         void (*complete)(void *context);
  71         u8 from_state;
  72         u8 to_state;
  73         int trac;
  74
  75         bool free;
  76 };
  77
  78 struct at86rf230_local {
  79         struct spi_device *spi;
  80
  81         struct ieee802154_hw *hw;
  82         struct at86rf2xx_chip_data *data;
  83         struct regmap *regmap;
  84         struct gpio_desc *slp_tr;
  85         bool sleep;
  86
  87         struct completion state_complete;
  88         struct at86rf230_state_change state;
  89
  90         unsigned long cal_timeout;
  91         bool is_tx;
  92         bool is_tx_from_off;
  93         bool was_tx;
  94         u8 tx_retry;
  95         struct sk_buff *tx_skb;
  96         struct at86rf230_state_change tx;
  97 };
  98
  99 #define AT86RF2XX_NUMREGS 0x3F
 100
 101 static void
 102 at86rf230_async_state_change(struct at86rf230_local *lp,
 103                              struct at86rf230_state_change *ctx,
 104                              const u8 state, void (*complete)(void *context));
 105
 106 static inline void
 107 at86rf230_sleep(struct at86rf230_local *lp)
 108 {
 109         if (lp->slp_tr) {
 110                 gpiod_set_value(lp->slp_tr, 1);
 111                 usleep_range(lp->data->t_off_to_sleep,
 112                              lp->data->t_off_to_sleep + 10);
 113                 lp->sleep = true;
 114         }
 115 }
 116
 117 static inline void
 118 at86rf230_awake(struct at86rf230_local *lp)
 119 {
 120         if (lp->slp_tr) {
 121                 gpiod_set_value(lp->slp_tr, 0);
 122                 usleep_range(lp->data->t_sleep_to_off,
 123                              lp->data->t_sleep_to_off + 100);
 124                 lp->sleep = false;
 125         }
 126 }
 127
 128 static inline int
 129 __at86rf230_write(struct at86rf230_local *lp,
 130                   unsigned int addr, unsigned int data)
 131 {
 132         bool sleep = lp->sleep;
 133         int ret;
 134
 135         /* awake for register setting if sleep */
 136         if (sleep)
 137                 at86rf230_awake(lp);
 138
 139         ret = regmap_write(lp->regmap, addr, data);
 140
 141         /* sleep again if was sleeping */
 142         if (sleep)
 143                 at86rf230_sleep(lp);
 144
 145         return ret;
 146 }
 147
 148 static inline int
 149 __at86rf230_read(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_read(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_subreg(struct at86rf230_local *lp,
 170                       unsigned int addr, unsigned int mask,
 171                       unsigned int shift, unsigned int *data)
 172 {
 173         int rc;
 174
 175         rc = __at86rf230_read(lp, addr, data);
 176         if (!rc)
 177                 *data = (*data & mask) >> shift;
 178
 179         return rc;
 180 }
 181
 182 static inline int
 183 at86rf230_write_subreg(struct at86rf230_local *lp,
 184                        unsigned int addr, unsigned int mask,
 185                        unsigned int shift, unsigned int data)
 186 {
 187         bool sleep = lp->sleep;
 188         int ret;
 189
 190         /* awake for register setting if sleep */
 191         if (sleep)
 192                 at86rf230_awake(lp);
 193
 194         ret = regmap_update_bits(lp->regmap, addr, mask, data << shift);
 195
 196         /* sleep again if was sleeping */
 197         if (sleep)
 198                 at86rf230_sleep(lp);
 199
 200         return ret;
 201 }
 202
 203 static inline void
 204 at86rf230_slp_tr_rising_edge(struct at86rf230_local *lp)
 205 {
 206         gpiod_set_value(lp->slp_tr, 1);
 207         udelay(1);
 208         gpiod_set_value(lp->slp_tr, 0);
 209 }
 210
 211 static bool
 212 at86rf230_reg_writeable(struct device *dev, unsigned int reg)
 213 {
 214         switch (reg) {
 215         case RG_TRX_STATE:
 216         case RG_TRX_CTRL_0:
 217         case RG_TRX_CTRL_1:
 218         case RG_PHY_TX_PWR:
 219         case RG_PHY_ED_LEVEL:
 220         case RG_PHY_CC_CCA:
 221         case RG_CCA_THRES:
 222         case RG_RX_CTRL:
 223         case RG_SFD_VALUE:
 224         case RG_TRX_CTRL_2:
 225         case RG_ANT_DIV:
 226         case RG_IRQ_MASK:
 227         case RG_VREG_CTRL:
 228         case RG_BATMON:
 229         case RG_XOSC_CTRL:
 230         case RG_RX_SYN:
 231         case RG_XAH_CTRL_1:
 232         case RG_FTN_CTRL:
 233         case RG_PLL_CF:
 234         case RG_PLL_DCU:
 235         case RG_SHORT_ADDR_0:
 236         case RG_SHORT_ADDR_1:
 237         case RG_PAN_ID_0:
 238         case RG_PAN_ID_1:
 239         case RG_IEEE_ADDR_0:
 240         case RG_IEEE_ADDR_1:
 241         case RG_IEEE_ADDR_2:
 242         case RG_IEEE_ADDR_3:
 243         case RG_IEEE_ADDR_4:
 244         case RG_IEEE_ADDR_5:
 245         case RG_IEEE_ADDR_6:
 246         case RG_IEEE_ADDR_7:
 247         case RG_XAH_CTRL_0:
 248         case RG_CSMA_SEED_0:
 249         case RG_CSMA_SEED_1:
 250         case RG_CSMA_BE:
 251                 return true;
 252         default:
 253                 return false;
 254         }
 255 }
 256
 257 static bool
 258 at86rf230_reg_readable(struct device *dev, unsigned int reg)
 259 {
 260         bool rc;
 261
 262         /* all writeable are also readable */
 263         rc = at86rf230_reg_writeable(dev, reg);
 264         if (rc)
 265                 return rc;
 266
 267         /* readonly regs */
 268         switch (reg) {
 269         case RG_TRX_STATUS:
 270         case RG_PHY_RSSI:
 271         case RG_IRQ_STATUS:
 272         case RG_PART_NUM:
 273         case RG_VERSION_NUM:
 274         case RG_MAN_ID_1:
 275         case RG_MAN_ID_0:
 276                 return true;
 277         default:
 278                 return false;
 279         }
 280 }
 281
 282 static bool
 283 at86rf230_reg_volatile(struct device *dev, unsigned int reg)
 284 {
 285         /* can be changed during runtime */
 286         switch (reg) {
 287         case RG_TRX_STATUS:
 288         case RG_TRX_STATE:
 289         case RG_PHY_RSSI:
 290         case RG_PHY_ED_LEVEL:
 291         case RG_IRQ_STATUS:
 292         case RG_VREG_CTRL:
 293         case RG_PLL_CF:
 294         case RG_PLL_DCU:
 295                 return true;
 296         default:
 297                 return false;
 298         }
 299 }
 300
 301 static bool
 302 at86rf230_reg_precious(struct device *dev, unsigned int reg)
 303 {
 304         /* don't clear irq line on read */
 305         switch (reg) {
 306         case RG_IRQ_STATUS:
 307                 return true;
 308         default:
 309                 return false;
 310         }
 311 }
 312
 313 static const struct regmap_config at86rf230_regmap_spi_config = {
 314         .reg_bits = 8,
 315         .val_bits = 8,
 316         .write_flag_mask = CMD_REG | CMD_WRITE,
 317         .read_flag_mask = CMD_REG,
 318         .cache_type = REGCACHE_MAPLE,
 319         .max_register = AT86RF2XX_NUMREGS,
 320         .writeable_reg = at86rf230_reg_writeable,
 321         .readable_reg = at86rf230_reg_readable,
 322         .volatile_reg = at86rf230_reg_volatile,
 323         .precious_reg = at86rf230_reg_precious,
 324 };
 325
 326 static void
 327 at86rf230_async_error_recover_complete(void *context)
 328 {
 329         struct at86rf230_state_change *ctx = context;
 330         struct at86rf230_local *lp = ctx->lp;
 331
 332         if (ctx->free)
 333                 kfree(ctx);
 334
 335         if (lp->was_tx) {
 336                 lp->was_tx = 0;
 337                 ieee802154_xmit_hw_error(lp->hw, lp->tx_skb);
 338         }
 339 }
 340
 341 static void
 342 at86rf230_async_error_recover(void *context)
 343 {
 344         struct at86rf230_state_change *ctx = context;
 345         struct at86rf230_local *lp = ctx->lp;
 346
 347         if (lp->is_tx) {
 348                 lp->was_tx = 1;
 349                 lp->is_tx = 0;
 350         }
 351
 352         at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON,
 353                                      at86rf230_async_error_recover_complete);
 354 }
 355
 356 static inline void
 357 at86rf230_async_error(struct at86rf230_local *lp,
 358                       struct at86rf230_state_change *ctx, int rc)
 359 {
 360         dev_err(&lp->spi->dev, "spi_async error %d\n", rc);
 361
 362         at86rf230_async_state_change(lp, ctx, STATE_FORCE_TRX_OFF,
 363                                      at86rf230_async_error_recover);
 364 }
 365
 366 /* Generic function to get some register value in async mode */
 367 static void
 368 at86rf230_async_read_reg(struct at86rf230_local *lp, u8 reg,
 369                          struct at86rf230_state_change *ctx,
 370                          void (*complete)(void *context))
 371 {
 372         int rc;
 373
 374         u8 *tx_buf = ctx->buf;
 375
 376         tx_buf[0] = (reg & CMD_REG_MASK) | CMD_REG;
 377         ctx->msg.complete = complete;
 378         rc = spi_async(lp->spi, &ctx->msg);
 379         if (rc)
 380                 at86rf230_async_error(lp, ctx, rc);
 381 }
 382
 383 static void
 384 at86rf230_async_write_reg(struct at86rf230_local *lp, u8 reg, u8 val,
 385                           struct at86rf230_state_change *ctx,
 386                           void (*complete)(void *context))
 387 {
 388         int rc;
 389
 390         ctx->buf[0] = (reg & CMD_REG_MASK) | CMD_REG | CMD_WRITE;
 391         ctx->buf[1] = val;
 392         ctx->msg.complete = complete;
 393         rc = spi_async(lp->spi, &ctx->msg);
 394         if (rc)
 395                 at86rf230_async_error(lp, ctx, rc);
 396 }
 397
 398 static void
 399 at86rf230_async_state_assert(void *context)
 400 {
 401         struct at86rf230_state_change *ctx = context;
 402         struct at86rf230_local *lp = ctx->lp;
 403         const u8 *buf = ctx->buf;
 404         const u8 trx_state = buf[1] & TRX_STATE_MASK;
 405
 406         /* Assert state change */
 407         if (trx_state != ctx->to_state) {
 408                 /* Special handling if transceiver state is in
 409                  * STATE_BUSY_RX_AACK and a SHR was detected.
 410                  */
 411                 if  (trx_state == STATE_BUSY_RX_AACK) {
 412                         /* Undocumented race condition. If we send a state
 413                          * change to STATE_RX_AACK_ON the transceiver could
 414                          * change his state automatically to STATE_BUSY_RX_AACK
 415                          * if a SHR was detected. This is not an error, but we
 416                          * can't assert this.
 417                          */
 418                         if (ctx->to_state == STATE_RX_AACK_ON)
 419                                 goto done;
 420
 421                         /* If we change to STATE_TX_ON without forcing and
 422                          * transceiver state is STATE_BUSY_RX_AACK, we wait
 423                          * 'tFrame + tPAck' receiving time. In this time the
 424                          * PDU should be received. If the transceiver is still
 425                          * in STATE_BUSY_RX_AACK, we run a force state change
 426                          * to STATE_TX_ON. This is a timeout handling, if the
 427                          * transceiver stucks in STATE_BUSY_RX_AACK.
 428                          *
 429                          * Additional we do several retries to try to get into
 430                          * TX_ON state without forcing. If the retries are
 431                          * higher or equal than AT86RF2XX_MAX_TX_RETRIES we
 432                          * will do a force change.
 433                          */
 434                         if (ctx->to_state == STATE_TX_ON ||
 435                             ctx->to_state == STATE_TRX_OFF) {
 436                                 u8 state = ctx->to_state;
 437
 438                                 if (lp->tx_retry >= AT86RF2XX_MAX_TX_RETRIES)
 439                                         state = STATE_FORCE_TRX_OFF;
 440                                 lp->tx_retry++;
 441
 442                                 at86rf230_async_state_change(lp, ctx, state,
 443                                                              ctx->complete);
 444                                 return;
 445                         }
 446                 }
 447
 448                 dev_warn(&lp->spi->dev, "unexcept state change from 0x%02x to 0x%02x. Actual state: 0x%02x\n",
 449                          ctx->from_state, ctx->to_state, trx_state);
 450         }
 451
 452 done:
 453         if (ctx->complete)
 454                 ctx->complete(context);
 455 }
 456
 457 static enum hrtimer_restart at86rf230_async_state_timer(struct hrtimer *timer)
 458 {
 459         struct at86rf230_state_change *ctx =
 460                 container_of(timer, struct at86rf230_state_change, timer);
 461         struct at86rf230_local *lp = ctx->lp;
 462
 463         at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 464                                  at86rf230_async_state_assert);
 465
 466         return HRTIMER_NORESTART;
 467 }
 468
 469 /* Do state change timing delay. */
 470 static void
 471 at86rf230_async_state_delay(void *context)
 472 {
 473         struct at86rf230_state_change *ctx = context;
 474         struct at86rf230_local *lp = ctx->lp;
 475         struct at86rf2xx_chip_data *c = lp->data;
 476         bool force = false;
 477         ktime_t tim;
 478
 479         /* The force state changes are will show as normal states in the
 480          * state status subregister. We change the to_state to the
 481          * corresponding one and remember if it was a force change, this
 482          * differs if we do a state change from STATE_BUSY_RX_AACK.
 483          */
 484         switch (ctx->to_state) {
 485         case STATE_FORCE_TX_ON:
 486                 ctx->to_state = STATE_TX_ON;
 487                 force = true;
 488                 break;
 489         case STATE_FORCE_TRX_OFF:
 490                 ctx->to_state = STATE_TRX_OFF;
 491                 force = true;
 492                 break;
 493         default:
 494                 break;
 495         }
 496
 497         switch (ctx->from_state) {
 498         case STATE_TRX_OFF:
 499                 switch (ctx->to_state) {
 500                 case STATE_RX_AACK_ON:
 501                         tim = c->t_off_to_aack * NSEC_PER_USEC;
 502                         /* state change from TRX_OFF to RX_AACK_ON to do a
 503                          * calibration, we need to reset the timeout for the
 504                          * next one.
 505                          */
 506                         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
 507                         goto change;
 508                 case STATE_TX_ARET_ON:
 509                 case STATE_TX_ON:
 510                         tim = c->t_off_to_tx_on * NSEC_PER_USEC;
 511                         /* state change from TRX_OFF to TX_ON or ARET_ON to do
 512                          * a calibration, we need to reset the timeout for the
 513                          * next one.
 514                          */
 515                         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
 516                         goto change;
 517                 default:
 518                         break;
 519                 }
 520                 break;
 521         case STATE_BUSY_RX_AACK:
 522                 switch (ctx->to_state) {
 523                 case STATE_TRX_OFF:
 524                 case STATE_TX_ON:
 525                         /* Wait for worst case receiving time if we
 526                          * didn't make a force change from BUSY_RX_AACK
 527                          * to TX_ON or TRX_OFF.
 528                          */
 529                         if (!force) {
 530                                 tim = (c->t_frame + c->t_p_ack) * NSEC_PER_USEC;
 531                                 goto change;
 532                         }
 533                         break;
 534                 default:
 535                         break;
 536                 }
 537                 break;
 538         /* Default value, means RESET state */
 539         case STATE_P_ON:
 540                 switch (ctx->to_state) {
 541                 case STATE_TRX_OFF:
 542                         tim = c->t_reset_to_off * NSEC_PER_USEC;
 543                         goto change;
 544                 default:
 545                         break;
 546                 }
 547                 break;
 548         default:
 549                 break;
 550         }
 551
 552         /* Default delay is 1us in the most cases */
 553         udelay(1);
 554         at86rf230_async_state_timer(&ctx->timer);
 555         return;
 556
 557 change:
 558         hrtimer_start(&ctx->timer, tim, HRTIMER_MODE_REL);
 559 }
 560
 561 static void
 562 at86rf230_async_state_change_start(void *context)
 563 {
 564         struct at86rf230_state_change *ctx = context;
 565         struct at86rf230_local *lp = ctx->lp;
 566         u8 *buf = ctx->buf;
 567         const u8 trx_state = buf[1] & TRX_STATE_MASK;
 568
 569         /* Check for "possible" STATE_TRANSITION_IN_PROGRESS */
 570         if (trx_state == STATE_TRANSITION_IN_PROGRESS) {
 571                 udelay(1);
 572                 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 573                                          at86rf230_async_state_change_start);
 574                 return;
 575         }
 576
 577         /* Check if we already are in the state which we change in */
 578         if (trx_state == ctx->to_state) {
 579                 if (ctx->complete)
 580                         ctx->complete(context);
 581                 return;
 582         }
 583
 584         /* Set current state to the context of state change */
 585         ctx->from_state = trx_state;
 586
 587         /* Going into the next step for a state change which do a timing
 588          * relevant delay.
 589          */
 590         at86rf230_async_write_reg(lp, RG_TRX_STATE, ctx->to_state, ctx,
 591                                   at86rf230_async_state_delay);
 592 }
 593
 594 static void
 595 at86rf230_async_state_change(struct at86rf230_local *lp,
 596                              struct at86rf230_state_change *ctx,
 597                              const u8 state, void (*complete)(void *context))
 598 {
 599         /* Initialization for the state change context */
 600         ctx->to_state = state;
 601         ctx->complete = complete;
 602         at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 603                                  at86rf230_async_state_change_start);
 604 }
 605
 606 static void
 607 at86rf230_sync_state_change_complete(void *context)
 608 {
 609         struct at86rf230_state_change *ctx = context;
 610         struct at86rf230_local *lp = ctx->lp;
 611
 612         complete(&lp->state_complete);
 613 }
 614
 615 /* This function do a sync framework above the async state change.
 616  * Some callbacks of the IEEE 802.15.4 driver interface need to be
 617  * handled synchronously.
 618  */
 619 static int
 620 at86rf230_sync_state_change(struct at86rf230_local *lp, unsigned int state)
 621 {
 622         unsigned long rc;
 623
 624         at86rf230_async_state_change(lp, &lp->state, state,
 625                                      at86rf230_sync_state_change_complete);
 626
 627         rc = wait_for_completion_timeout(&lp->state_complete,
 628                                          msecs_to_jiffies(100));
 629         if (!rc) {
 630                 at86rf230_async_error(lp, &lp->state, -ETIMEDOUT);
 631                 return -ETIMEDOUT;
 632         }
 633
 634         return 0;
 635 }
 636
 637 static void
 638 at86rf230_tx_complete(void *context)
 639 {
 640         struct at86rf230_state_change *ctx = context;
 641         struct at86rf230_local *lp = ctx->lp;
 642
 643         if (ctx->trac == IEEE802154_SUCCESS)
 644                 ieee802154_xmit_complete(lp->hw, lp->tx_skb, false);
 645         else
 646                 ieee802154_xmit_error(lp->hw, lp->tx_skb, ctx->trac);
 647
 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         u8 trac = TRAC_MASK(ctx->buf[1]);
 667
 668         switch (trac) {
 669         case TRAC_SUCCESS:
 670         case TRAC_SUCCESS_DATA_PENDING:
 671                 ctx->trac = IEEE802154_SUCCESS;
 672                 break;
 673         case TRAC_CHANNEL_ACCESS_FAILURE:
 674                 ctx->trac = IEEE802154_CHANNEL_ACCESS_FAILURE;
 675                 break;
 676         case TRAC_NO_ACK:
 677                 ctx->trac = IEEE802154_NO_ACK;
 678                 break;
 679         default:
 680                 ctx->trac = IEEE802154_SYSTEM_ERROR;
 681         }
 682
 683         at86rf230_async_state_change(lp, ctx, STATE_TX_ON, at86rf230_tx_on);
 684 }
 685
 686 static void
 687 at86rf230_rx_read_frame_complete(void *context)
 688 {
 689         struct at86rf230_state_change *ctx = context;
 690         struct at86rf230_local *lp = ctx->lp;
 691         const u8 *buf = ctx->buf;
 692         struct sk_buff *skb;
 693         u8 len, lqi;
 694
 695         len = buf[1];
 696         if (!ieee802154_is_valid_psdu_len(len)) {
 697                 dev_vdbg(&lp->spi->dev, "corrupted frame received\n");
 698                 len = IEEE802154_MTU;
 699         }
 700         lqi = buf[2 + len];
 701
 702         skb = dev_alloc_skb(IEEE802154_MTU);
 703         if (!skb) {
 704                 dev_vdbg(&lp->spi->dev, "failed to allocate sk_buff\n");
 705                 kfree(ctx);
 706                 return;
 707         }
 708
 709         skb_put_data(skb, buf + 2, len);
 710         ieee802154_rx_irqsafe(lp->hw, skb, lqi);
 711         kfree(ctx);
 712 }
 713
 714 static void
 715 at86rf230_rx_trac_check(void *context)
 716 {
 717         struct at86rf230_state_change *ctx = context;
 718         struct at86rf230_local *lp = ctx->lp;
 719         u8 *buf = ctx->buf;
 720         int rc;
 721
 722         buf[0] = CMD_FB;
 723         ctx->trx.len = AT86RF2XX_MAX_BUF;
 724         ctx->msg.complete = at86rf230_rx_read_frame_complete;
 725         rc = spi_async(lp->spi, &ctx->msg);
 726         if (rc) {
 727                 ctx->trx.len = 2;
 728                 at86rf230_async_error(lp, ctx, rc);
 729         }
 730 }
 731
 732 static void
 733 at86rf230_irq_trx_end(void *context)
 734 {
 735         struct at86rf230_state_change *ctx = context;
 736         struct at86rf230_local *lp = ctx->lp;
 737
 738         if (lp->is_tx) {
 739                 lp->is_tx = 0;
 740                 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx,
 741                                          at86rf230_tx_trac_check);
 742         } else {
 743                 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx,
 744                                          at86rf230_rx_trac_check);
 745         }
 746 }
 747
 748 static void
 749 at86rf230_irq_status(void *context)
 750 {
 751         struct at86rf230_state_change *ctx = context;
 752         struct at86rf230_local *lp = ctx->lp;
 753         const u8 *buf = ctx->buf;
 754         u8 irq = buf[1];
 755
 756         enable_irq(lp->spi->irq);
 757
 758         if (irq & IRQ_TRX_END) {
 759                 at86rf230_irq_trx_end(ctx);
 760         } else {
 761                 dev_err(&lp->spi->dev, "not supported irq %02x received\n",
 762                         irq);
 763                 kfree(ctx);
 764         }
 765 }
 766
 767 static void
 768 at86rf230_setup_spi_messages(struct at86rf230_local *lp,
 769                              struct at86rf230_state_change *state)
 770 {
 771         state->lp = lp;
 772         state->irq = lp->spi->irq;
 773         spi_message_init(&state->msg);
 774         state->msg.context = state;
 775         state->trx.len = 2;
 776         state->trx.tx_buf = state->buf;
 777         state->trx.rx_buf = state->buf;
 778         spi_message_add_tail(&state->trx, &state->msg);
 779         hrtimer_init(&state->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 780         state->timer.function = at86rf230_async_state_timer;
 781 }
 782
 783 static irqreturn_t at86rf230_isr(int irq, void *data)
 784 {
 785         struct at86rf230_local *lp = data;
 786         struct at86rf230_state_change *ctx;
 787         int rc;
 788
 789         disable_irq_nosync(irq);
 790
 791         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 792         if (!ctx) {
 793                 enable_irq(irq);
 794                 return IRQ_NONE;
 795         }
 796
 797         at86rf230_setup_spi_messages(lp, ctx);
 798         /* tell on error handling to free ctx */
 799         ctx->free = true;
 800
 801         ctx->buf[0] = (RG_IRQ_STATUS & CMD_REG_MASK) | CMD_REG;
 802         ctx->msg.complete = at86rf230_irq_status;
 803         rc = spi_async(lp->spi, &ctx->msg);
 804         if (rc) {
 805                 at86rf230_async_error(lp, ctx, rc);
 806                 enable_irq(irq);
 807                 return IRQ_NONE;
 808         }
 809
 810         return IRQ_HANDLED;
 811 }
 812
 813 static void
 814 at86rf230_write_frame_complete(void *context)
 815 {
 816         struct at86rf230_state_change *ctx = context;
 817         struct at86rf230_local *lp = ctx->lp;
 818
 819         ctx->trx.len = 2;
 820
 821         if (lp->slp_tr)
 822                 at86rf230_slp_tr_rising_edge(lp);
 823         else
 824                 at86rf230_async_write_reg(lp, RG_TRX_STATE, STATE_BUSY_TX, ctx,
 825                                           NULL);
 826 }
 827
 828 static void
 829 at86rf230_write_frame(void *context)
 830 {
 831         struct at86rf230_state_change *ctx = context;
 832         struct at86rf230_local *lp = ctx->lp;
 833         struct sk_buff *skb = lp->tx_skb;
 834         u8 *buf = ctx->buf;
 835         int rc;
 836
 837         lp->is_tx = 1;
 838
 839         buf[0] = CMD_FB | CMD_WRITE;
 840         buf[1] = skb->len + 2;
 841         memcpy(buf + 2, skb->data, skb->len);
 842         ctx->trx.len = skb->len + 2;
 843         ctx->msg.complete = at86rf230_write_frame_complete;
 844         rc = spi_async(lp->spi, &ctx->msg);
 845         if (rc) {
 846                 ctx->trx.len = 2;
 847                 at86rf230_async_error(lp, ctx, rc);
 848         }
 849 }
 850
 851 static void
 852 at86rf230_xmit_tx_on(void *context)
 853 {
 854         struct at86rf230_state_change *ctx = context;
 855         struct at86rf230_local *lp = ctx->lp;
 856
 857         at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
 858                                      at86rf230_write_frame);
 859 }
 860
 861 static void
 862 at86rf230_xmit_start(void *context)
 863 {
 864         struct at86rf230_state_change *ctx = context;
 865         struct at86rf230_local *lp = ctx->lp;
 866
 867         /* check if we change from off state */
 868         if (lp->is_tx_from_off)
 869                 at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
 870                                              at86rf230_write_frame);
 871         else
 872                 at86rf230_async_state_change(lp, ctx, STATE_TX_ON,
 873                                              at86rf230_xmit_tx_on);
 874 }
 875
 876 static int
 877 at86rf230_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
 878 {
 879         struct at86rf230_local *lp = hw->priv;
 880         struct at86rf230_state_change *ctx = &lp->tx;
 881
 882         lp->tx_skb = skb;
 883         lp->tx_retry = 0;
 884
 885         /* After 5 minutes in PLL and the same frequency we run again the
 886          * calibration loops which is recommended by at86rf2xx datasheets.
 887          *
 888          * The calibration is initiate by a state change from TRX_OFF
 889          * to TX_ON, the lp->cal_timeout should be reinit by state_delay
 890          * function then to start in the next 5 minutes.
 891          */
 892         if (time_is_before_jiffies(lp->cal_timeout)) {
 893                 lp->is_tx_from_off = true;
 894                 at86rf230_async_state_change(lp, ctx, STATE_TRX_OFF,
 895                                              at86rf230_xmit_start);
 896         } else {
 897                 lp->is_tx_from_off = false;
 898                 at86rf230_xmit_start(ctx);
 899         }
 900
 901         return 0;
 902 }
 903
 904 static int
 905 at86rf230_ed(struct ieee802154_hw *hw, u8 *level)
 906 {
 907         WARN_ON(!level);
 908         *level = 0xbe;
 909         return 0;
 910 }
 911
 912 static int
 913 at86rf230_start(struct ieee802154_hw *hw)
 914 {
 915         struct at86rf230_local *lp = hw->priv;
 916
 917         at86rf230_awake(lp);
 918         enable_irq(lp->spi->irq);
 919
 920         return at86rf230_sync_state_change(lp, STATE_RX_AACK_ON);
 921 }
 922
 923 static void
 924 at86rf230_stop(struct ieee802154_hw *hw)
 925 {
 926         struct at86rf230_local *lp = hw->priv;
 927         u8 csma_seed[2];
 928
 929         at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
 930
 931         disable_irq(lp->spi->irq);
 932
 933         /* It's recommended to set random new csma_seeds before sleep state.
 934          * Makes only sense in the stop callback, not doing this inside of
 935          * at86rf230_sleep, this is also used when we don't transmit afterwards
 936          * when calling start callback again.
 937          */
 938         get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
 939         at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
 940         at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
 941
 942         at86rf230_sleep(lp);
 943 }
 944
 945 static int
 946 at86rf23x_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
 947 {
 948         return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
 949 }
 950
 951 #define AT86RF2XX_MAX_ED_LEVELS 0xF
 952 static const s32 at86rf233_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = {
 953         -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000, -7800, -7600,
 954         -7400, -7200, -7000, -6800, -6600, -6400,
 955 };
 956
 957 static const s32 at86rf231_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = {
 958         -9100, -8900, -8700, -8500, -8300, -8100, -7900, -7700, -7500, -7300,
 959         -7100, -6900, -6700, -6500, -6300, -6100,
 960 };
 961
 962 static const s32 at86rf212_ed_levels_100[AT86RF2XX_MAX_ED_LEVELS + 1] = {
 963         -10000, -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200,
 964         -8000, -7800, -7600, -7400, -7200, -7000,
 965 };
 966
 967 static const s32 at86rf212_ed_levels_98[AT86RF2XX_MAX_ED_LEVELS + 1] = {
 968         -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000,
 969         -7800, -7600, -7400, -7200, -7000, -6800,
 970 };
 971
 972 static inline int
 973 at86rf212_update_cca_ed_level(struct at86rf230_local *lp, int rssi_base_val)
 974 {
 975         unsigned int cca_ed_thres;
 976         int rc;
 977
 978         rc = at86rf230_read_subreg(lp, SR_CCA_ED_THRES, &cca_ed_thres);
 979         if (rc < 0)
 980                 return rc;
 981
 982         switch (rssi_base_val) {
 983         case -98:
 984                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_98;
 985                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_98);
 986                 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_98[cca_ed_thres];
 987                 break;
 988         case -100:
 989                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
 990                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
 991                 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_100[cca_ed_thres];
 992                 break;
 993         default:
 994                 WARN_ON(1);
 995         }
 996
 997         return 0;
 998 }
 999
1000 static int
1001 at86rf212_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
1002 {
1003         int rc;
1004
1005         if (channel == 0)
1006                 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 0);
1007         else
1008                 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 1);
1009         if (rc < 0)
1010                 return rc;
1011
1012         if (page == 0) {
1013                 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 0);
1014                 lp->data->rssi_base_val = -100;
1015         } else {
1016                 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 1);
1017                 lp->data->rssi_base_val = -98;
1018         }
1019         if (rc < 0)
1020                 return rc;
1021
1022         rc = at86rf212_update_cca_ed_level(lp, lp->data->rssi_base_val);
1023         if (rc < 0)
1024                 return rc;
1025
1026         return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
1027 }
1028
1029 static int
1030 at86rf230_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
1031 {
1032         struct at86rf230_local *lp = hw->priv;
1033         int rc;
1034
1035         rc = lp->data->set_channel(lp, page, channel);
1036         /* Wait for PLL */
1037         usleep_range(lp->data->t_channel_switch,
1038                      lp->data->t_channel_switch + 10);
1039
1040         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
1041         return rc;
1042 }
1043
1044 static int
1045 at86rf230_set_hw_addr_filt(struct ieee802154_hw *hw,
1046                            struct ieee802154_hw_addr_filt *filt,
1047                            unsigned long changed)
1048 {
1049         struct at86rf230_local *lp = hw->priv;
1050
1051         if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
1052                 u16 addr = le16_to_cpu(filt->short_addr);
1053
1054                 dev_vdbg(&lp->spi->dev, "%s called for saddr\n", __func__);
1055                 __at86rf230_write(lp, RG_SHORT_ADDR_0, addr);
1056                 __at86rf230_write(lp, RG_SHORT_ADDR_1, addr >> 8);
1057         }
1058
1059         if (changed & IEEE802154_AFILT_PANID_CHANGED) {
1060                 u16 pan = le16_to_cpu(filt->pan_id);
1061
1062                 dev_vdbg(&lp->spi->dev, "%s called for pan id\n", __func__);
1063                 __at86rf230_write(lp, RG_PAN_ID_0, pan);
1064                 __at86rf230_write(lp, RG_PAN_ID_1, pan >> 8);
1065         }
1066
1067         if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
1068                 u8 i, addr[8];
1069
1070                 memcpy(addr, &filt->ieee_addr, 8);
1071                 dev_vdbg(&lp->spi->dev, "%s called for IEEE addr\n", __func__);
1072                 for (i = 0; i < 8; i++)
1073                         __at86rf230_write(lp, RG_IEEE_ADDR_0 + i, addr[i]);
1074         }
1075
1076         if (changed & IEEE802154_AFILT_PANC_CHANGED) {
1077                 dev_vdbg(&lp->spi->dev, "%s called for panc change\n", __func__);
1078                 if (filt->pan_coord)
1079                         at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 1);
1080                 else
1081                         at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 0);
1082         }
1083
1084         return 0;
1085 }
1086
1087 #define AT86RF23X_MAX_TX_POWERS 0xF
1088 static const s32 at86rf233_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1089         400, 370, 340, 300, 250, 200, 100, 0, -100, -200, -300, -400, -600,
1090         -800, -1200, -1700,
1091 };
1092
1093 static const s32 at86rf231_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1094         300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700,
1095         -900, -1200, -1700,
1096 };
1097
1098 #define AT86RF212_MAX_TX_POWERS 0x1F
1099 static const s32 at86rf212_powers[AT86RF212_MAX_TX_POWERS + 1] = {
1100         500, 400, 300, 200, 100, 0, -100, -200, -300, -400, -500, -600, -700,
1101         -800, -900, -1000, -1100, -1200, -1300, -1400, -1500, -1600, -1700,
1102         -1800, -1900, -2000, -2100, -2200, -2300, -2400, -2500, -2600,
1103 };
1104
1105 static int
1106 at86rf23x_set_txpower(struct at86rf230_local *lp, s32 mbm)
1107 {
1108         u32 i;
1109
1110         for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1111                 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1112                         return at86rf230_write_subreg(lp, SR_TX_PWR_23X, i);
1113         }
1114
1115         return -EINVAL;
1116 }
1117
1118 static int
1119 at86rf212_set_txpower(struct at86rf230_local *lp, s32 mbm)
1120 {
1121         u32 i;
1122
1123         for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1124                 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1125                         return at86rf230_write_subreg(lp, SR_TX_PWR_212, i);
1126         }
1127
1128         return -EINVAL;
1129 }
1130
1131 static int
1132 at86rf230_set_txpower(struct ieee802154_hw *hw, s32 mbm)
1133 {
1134         struct at86rf230_local *lp = hw->priv;
1135
1136         return lp->data->set_txpower(lp, mbm);
1137 }
1138
1139 static int
1140 at86rf230_set_lbt(struct ieee802154_hw *hw, bool on)
1141 {
1142         struct at86rf230_local *lp = hw->priv;
1143
1144         return at86rf230_write_subreg(lp, SR_CSMA_LBT_MODE, on);
1145 }
1146
1147 static int
1148 at86rf230_set_cca_mode(struct ieee802154_hw *hw,
1149                        const struct wpan_phy_cca *cca)
1150 {
1151         struct at86rf230_local *lp = hw->priv;
1152         u8 val;
1153
1154         /* mapping 802.15.4 to driver spec */
1155         switch (cca->mode) {
1156         case NL802154_CCA_ENERGY:
1157                 val = 1;
1158                 break;
1159         case NL802154_CCA_CARRIER:
1160                 val = 2;
1161                 break;
1162         case NL802154_CCA_ENERGY_CARRIER:
1163                 switch (cca->opt) {
1164                 case NL802154_CCA_OPT_ENERGY_CARRIER_AND:
1165                         val = 3;
1166                         break;
1167                 case NL802154_CCA_OPT_ENERGY_CARRIER_OR:
1168                         val = 0;
1169                         break;
1170                 default:
1171                         return -EINVAL;
1172                 }
1173                 break;
1174         default:
1175                 return -EINVAL;
1176         }
1177
1178         return at86rf230_write_subreg(lp, SR_CCA_MODE, val);
1179 }
1180
1181 static int
1182 at86rf230_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
1183 {
1184         struct at86rf230_local *lp = hw->priv;
1185         u32 i;
1186
1187         for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) {
1188                 if (hw->phy->supported.cca_ed_levels[i] == mbm)
1189                         return at86rf230_write_subreg(lp, SR_CCA_ED_THRES, i);
1190         }
1191
1192         return -EINVAL;
1193 }
1194
1195 static int
1196 at86rf230_set_csma_params(struct ieee802154_hw *hw, u8 min_be, u8 max_be,
1197                           u8 retries)
1198 {
1199         struct at86rf230_local *lp = hw->priv;
1200         int rc;
1201
1202         rc = at86rf230_write_subreg(lp, SR_MIN_BE, min_be);
1203         if (rc)
1204                 return rc;
1205
1206         rc = at86rf230_write_subreg(lp, SR_MAX_BE, max_be);
1207         if (rc)
1208                 return rc;
1209
1210         return at86rf230_write_subreg(lp, SR_MAX_CSMA_RETRIES, retries);
1211 }
1212
1213 static int
1214 at86rf230_set_frame_retries(struct ieee802154_hw *hw, s8 retries)
1215 {
1216         struct at86rf230_local *lp = hw->priv;
1217
1218         return at86rf230_write_subreg(lp, SR_MAX_FRAME_RETRIES, retries);
1219 }
1220
1221 static int
1222 at86rf230_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
1223 {
1224         struct at86rf230_local *lp = hw->priv;
1225         int rc;
1226
1227         if (on) {
1228                 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 1);
1229                 if (rc < 0)
1230                         return rc;
1231
1232                 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 1);
1233                 if (rc < 0)
1234                         return rc;
1235         } else {
1236                 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 0);
1237                 if (rc < 0)
1238                         return rc;
1239
1240                 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 0);
1241                 if (rc < 0)
1242                         return rc;
1243         }
1244
1245         return 0;
1246 }
1247
1248 static const struct ieee802154_ops at86rf230_ops = {
1249         .owner = THIS_MODULE,
1250         .xmit_async = at86rf230_xmit,
1251         .ed = at86rf230_ed,
1252         .set_channel = at86rf230_channel,
1253         .start = at86rf230_start,
1254         .stop = at86rf230_stop,
1255         .set_hw_addr_filt = at86rf230_set_hw_addr_filt,
1256         .set_txpower = at86rf230_set_txpower,
1257         .set_lbt = at86rf230_set_lbt,
1258         .set_cca_mode = at86rf230_set_cca_mode,
1259         .set_cca_ed_level = at86rf230_set_cca_ed_level,
1260         .set_csma_params = at86rf230_set_csma_params,
1261         .set_frame_retries = at86rf230_set_frame_retries,
1262         .set_promiscuous_mode = at86rf230_set_promiscuous_mode,
1263 };
1264
1265 static struct at86rf2xx_chip_data at86rf233_data = {
1266         .t_sleep_cycle = 330,
1267         .t_channel_switch = 11,
1268         .t_reset_to_off = 26,
1269         .t_off_to_aack = 80,
1270         .t_off_to_tx_on = 80,
1271         .t_off_to_sleep = 35,
1272         .t_sleep_to_off = 1000,
1273         .t_frame = 4096,
1274         .t_p_ack = 545,
1275         .rssi_base_val = -94,
1276         .set_channel = at86rf23x_set_channel,
1277         .set_txpower = at86rf23x_set_txpower,
1278 };
1279
1280 static struct at86rf2xx_chip_data at86rf231_data = {
1281         .t_sleep_cycle = 330,
1282         .t_channel_switch = 24,
1283         .t_reset_to_off = 37,
1284         .t_off_to_aack = 110,
1285         .t_off_to_tx_on = 110,
1286         .t_off_to_sleep = 35,
1287         .t_sleep_to_off = 1000,
1288         .t_frame = 4096,
1289         .t_p_ack = 545,
1290         .rssi_base_val = -91,
1291         .set_channel = at86rf23x_set_channel,
1292         .set_txpower = at86rf23x_set_txpower,
1293 };
1294
1295 static struct at86rf2xx_chip_data at86rf212_data = {
1296         .t_sleep_cycle = 330,
1297         .t_channel_switch = 11,
1298         .t_reset_to_off = 26,
1299         .t_off_to_aack = 200,
1300         .t_off_to_tx_on = 200,
1301         .t_off_to_sleep = 35,
1302         .t_sleep_to_off = 1000,
1303         .t_frame = 4096,
1304         .t_p_ack = 545,
1305         .rssi_base_val = -100,
1306         .set_channel = at86rf212_set_channel,
1307         .set_txpower = at86rf212_set_txpower,
1308 };
1309
1310 static int at86rf230_hw_init(struct at86rf230_local *lp, u8 xtal_trim)
1311 {
1312         int rc, irq_type, irq_pol = IRQ_ACTIVE_HIGH;
1313         unsigned int dvdd;
1314         u8 csma_seed[2];
1315
1316         rc = at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
1317         if (rc)
1318                 return rc;
1319
1320         irq_type = irq_get_trigger_type(lp->spi->irq);
1321         if (irq_type == IRQ_TYPE_EDGE_FALLING ||
1322             irq_type == IRQ_TYPE_LEVEL_LOW)
1323                 irq_pol = IRQ_ACTIVE_LOW;
1324
1325         rc = at86rf230_write_subreg(lp, SR_IRQ_POLARITY, irq_pol);
1326         if (rc)
1327                 return rc;
1328
1329         rc = at86rf230_write_subreg(lp, SR_RX_SAFE_MODE, 1);
1330         if (rc)
1331                 return rc;
1332
1333         rc = at86rf230_write_subreg(lp, SR_IRQ_MASK, IRQ_TRX_END);
1334         if (rc)
1335                 return rc;
1336
1337         /* reset values differs in at86rf231 and at86rf233 */
1338         rc = at86rf230_write_subreg(lp, SR_IRQ_MASK_MODE, 0);
1339         if (rc)
1340                 return rc;
1341
1342         get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
1343         rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
1344         if (rc)
1345                 return rc;
1346         rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
1347         if (rc)
1348                 return rc;
1349
1350         /* CLKM changes are applied immediately */
1351         rc = at86rf230_write_subreg(lp, SR_CLKM_SHA_SEL, 0x00);
1352         if (rc)
1353                 return rc;
1354
1355         /* Turn CLKM Off */
1356         rc = at86rf230_write_subreg(lp, SR_CLKM_CTRL, 0x00);
1357         if (rc)
1358                 return rc;
1359         /* Wait the next SLEEP cycle */
1360         usleep_range(lp->data->t_sleep_cycle,
1361                      lp->data->t_sleep_cycle + 100);
1362
1363         /* xtal_trim value is calculated by:
1364          * CL = 0.5 * (CX + CTRIM + CPAR)
1365          *
1366          * whereas:
1367          * CL = capacitor of used crystal
1368          * CX = connected capacitors at xtal pins
1369          * CPAR = in all at86rf2xx datasheets this is a constant value 3 pF,
1370          *        but this is different on each board setup. You need to fine
1371          *        tuning this value via CTRIM.
1372          * CTRIM = variable capacitor setting. Resolution is 0.3 pF range is
1373          *         0 pF upto 4.5 pF.
1374          *
1375          * Examples:
1376          * atben transceiver:
1377          *
1378          * CL = 8 pF
1379          * CX = 12 pF
1380          * CPAR = 3 pF (We assume the magic constant from datasheet)
1381          * CTRIM = 0.9 pF
1382          *
1383          * (12+0.9+3)/2 = 7.95 which is nearly at 8 pF
1384          *
1385          * xtal_trim = 0x3
1386          *
1387          * openlabs transceiver:
1388          *
1389          * CL = 16 pF
1390          * CX = 22 pF
1391          * CPAR = 3 pF (We assume the magic constant from datasheet)
1392          * CTRIM = 4.5 pF
1393          *
1394          * (22+4.5+3)/2 = 14.75 which is the nearest value to 16 pF
1395          *
1396          * xtal_trim = 0xf
1397          */
1398         rc = at86rf230_write_subreg(lp, SR_XTAL_TRIM, xtal_trim);
1399         if (rc)
1400                 return rc;
1401
1402         rc = at86rf230_read_subreg(lp, SR_DVDD_OK, &dvdd);
1403         if (rc)
1404                 return rc;
1405         if (!dvdd) {
1406                 dev_err(&lp->spi->dev, "DVDD error\n");
1407                 return -EINVAL;
1408         }
1409
1410         /* Force setting slotted operation bit to 0. Sometimes the atben
1411          * sets this bit and I don't know why. We set this always force
1412          * to zero while probing.
1413          */
1414         return at86rf230_write_subreg(lp, SR_SLOTTED_OPERATION, 0);
1415 }
1416
1417 static int
1418 at86rf230_detect_device(struct at86rf230_local *lp)
1419 {
1420         unsigned int part, version, val;
1421         u16 man_id = 0;
1422         const char *chip;
1423         int rc;
1424
1425         rc = __at86rf230_read(lp, RG_MAN_ID_0, &val);
1426         if (rc)
1427                 return rc;
1428         man_id |= val;
1429
1430         rc = __at86rf230_read(lp, RG_MAN_ID_1, &val);
1431         if (rc)
1432                 return rc;
1433         man_id |= (val << 8);
1434
1435         rc = __at86rf230_read(lp, RG_PART_NUM, &part);
1436         if (rc)
1437                 return rc;
1438
1439         rc = __at86rf230_read(lp, RG_VERSION_NUM, &version);
1440         if (rc)
1441                 return rc;
1442
1443         if (man_id != 0x001f) {
1444                 dev_err(&lp->spi->dev, "Non-Atmel dev found (MAN_ID %02x %02x)\n",
1445                         man_id >> 8, man_id & 0xFF);
1446                 return -EINVAL;
1447         }
1448
1449         lp->hw->flags = IEEE802154_HW_TX_OMIT_CKSUM |
1450                         IEEE802154_HW_CSMA_PARAMS |
1451                         IEEE802154_HW_FRAME_RETRIES | IEEE802154_HW_AFILT |
1452                         IEEE802154_HW_PROMISCUOUS;
1453
1454         lp->hw->phy->flags = WPAN_PHY_FLAG_TXPOWER |
1455                              WPAN_PHY_FLAG_CCA_ED_LEVEL |
1456                              WPAN_PHY_FLAG_CCA_MODE;
1457
1458         lp->hw->phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY) |
1459                 BIT(NL802154_CCA_CARRIER) | BIT(NL802154_CCA_ENERGY_CARRIER);
1460         lp->hw->phy->supported.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND) |
1461                 BIT(NL802154_CCA_OPT_ENERGY_CARRIER_OR);
1462
1463         lp->hw->phy->cca.mode = NL802154_CCA_ENERGY;
1464
1465         switch (part) {
1466         case 2:
1467                 chip = "at86rf230";
1468                 rc = -ENOTSUPP;
1469                 goto not_supp;
1470         case 3:
1471                 chip = "at86rf231";
1472                 lp->data = &at86rf231_data;
1473                 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1474                 lp->hw->phy->current_channel = 11;
1475                 lp->hw->phy->supported.tx_powers = at86rf231_powers;
1476                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf231_powers);
1477                 lp->hw->phy->supported.cca_ed_levels = at86rf231_ed_levels;
1478                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf231_ed_levels);
1479                 break;
1480         case 7:
1481                 chip = "at86rf212";
1482                 lp->data = &at86rf212_data;
1483                 lp->hw->flags |= IEEE802154_HW_LBT;
1484                 lp->hw->phy->supported.channels[0] = 0x00007FF;
1485                 lp->hw->phy->supported.channels[2] = 0x00007FF;
1486                 lp->hw->phy->current_channel = 5;
1487                 lp->hw->phy->supported.lbt = NL802154_SUPPORTED_BOOL_BOTH;
1488                 lp->hw->phy->supported.tx_powers = at86rf212_powers;
1489                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf212_powers);
1490                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
1491                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
1492                 break;
1493         case 11:
1494                 chip = "at86rf233";
1495                 lp->data = &at86rf233_data;
1496                 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1497                 lp->hw->phy->current_channel = 13;
1498                 lp->hw->phy->supported.tx_powers = at86rf233_powers;
1499                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf233_powers);
1500                 lp->hw->phy->supported.cca_ed_levels = at86rf233_ed_levels;
1501                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf233_ed_levels);
1502                 break;
1503         default:
1504                 chip = "unknown";
1505                 rc = -ENOTSUPP;
1506                 goto not_supp;
1507         }
1508
1509         lp->hw->phy->cca_ed_level = lp->hw->phy->supported.cca_ed_levels[7];
1510         lp->hw->phy->transmit_power = lp->hw->phy->supported.tx_powers[0];
1511
1512 not_supp:
1513         dev_info(&lp->spi->dev, "Detected %s chip version %d\n", chip, version);
1514
1515         return rc;
1516 }
1517
1518 static int at86rf230_probe(struct spi_device *spi)
1519 {
1520         struct ieee802154_hw *hw;
1521         struct at86rf230_local *lp;
1522         struct gpio_desc *slp_tr;
1523         struct gpio_desc *rstn;
1524         unsigned int status;
1525         int rc, irq_type;
1526         u8 xtal_trim;
1527
1528         if (!spi->irq) {
1529                 dev_err(&spi->dev, "no IRQ specified\n");
1530                 return -EINVAL;
1531         }
1532
1533         rc = device_property_read_u8(&spi->dev, "xtal-trim", &xtal_trim);
1534         if (rc < 0) {
1535                 if (rc != -EINVAL) {
1536                         dev_err(&spi->dev,
1537                                 "failed to parse xtal-trim: %d\n", rc);
1538                         return rc;
1539                 }
1540                 xtal_trim = 0;
1541         }
1542
1543         rstn = devm_gpiod_get_optional(&spi->dev, "reset", GPIOD_OUT_LOW);
1544         rc = PTR_ERR_OR_ZERO(rstn);
1545         if (rc)
1546                 return rc;
1547
1548         gpiod_set_consumer_name(rstn, "rstn");
1549
1550         slp_tr = devm_gpiod_get_optional(&spi->dev, "sleep", GPIOD_OUT_LOW);
1551         rc = PTR_ERR_OR_ZERO(slp_tr);
1552         if (rc)
1553                 return rc;
1554
1555         gpiod_set_consumer_name(slp_tr, "slp_tr");
1556
1557         /* Reset */
1558         if (rstn) {
1559                 udelay(1);
1560                 gpiod_set_value_cansleep(rstn, 1);
1561                 udelay(1);
1562                 gpiod_set_value_cansleep(rstn, 0);
1563                 usleep_range(120, 240);
1564         }
1565
1566         hw = ieee802154_alloc_hw(sizeof(*lp), &at86rf230_ops);
1567         if (!hw)
1568                 return -ENOMEM;
1569
1570         lp = hw->priv;
1571         lp->hw = hw;
1572         lp->spi = spi;
1573         lp->slp_tr = slp_tr;
1574         hw->parent = &spi->dev;
1575         ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
1576
1577         lp->regmap = devm_regmap_init_spi(spi, &at86rf230_regmap_spi_config);
1578         if (IS_ERR(lp->regmap)) {
1579                 rc = PTR_ERR(lp->regmap);
1580                 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
1581                         rc);
1582                 goto free_dev;
1583         }
1584
1585         at86rf230_setup_spi_messages(lp, &lp->state);
1586         at86rf230_setup_spi_messages(lp, &lp->tx);
1587
1588         rc = at86rf230_detect_device(lp);
1589         if (rc < 0)
1590                 goto free_dev;
1591
1592         init_completion(&lp->state_complete);
1593
1594         spi_set_drvdata(spi, lp);
1595
1596         rc = at86rf230_hw_init(lp, xtal_trim);
1597         if (rc)
1598                 goto free_dev;
1599
1600         /* Read irq status register to reset irq line */
1601         rc = at86rf230_read_subreg(lp, RG_IRQ_STATUS, 0xff, 0, &status);
1602         if (rc)
1603                 goto free_dev;
1604
1605         irq_type = irq_get_trigger_type(spi->irq);
1606         if (!irq_type)
1607                 irq_type = IRQF_TRIGGER_HIGH;
1608
1609         rc = devm_request_irq(&spi->dev, spi->irq, at86rf230_isr,
1610                               IRQF_SHARED | irq_type, dev_name(&spi->dev), lp);
1611         if (rc)
1612                 goto free_dev;
1613
1614         /* disable_irq by default and wait for starting hardware */
1615         disable_irq(spi->irq);
1616
1617         /* going into sleep by default */
1618         at86rf230_sleep(lp);
1619
1620         rc = ieee802154_register_hw(lp->hw);
1621         if (rc)
1622                 goto free_dev;
1623
1624         return rc;
1625
1626 free_dev:
1627         ieee802154_free_hw(lp->hw);
1628
1629         return rc;
1630 }
1631
1632 static void at86rf230_remove(struct spi_device *spi)
1633 {
1634         struct at86rf230_local *lp = spi_get_drvdata(spi);
1635
1636         /* mask all at86rf230 irq's */
1637         at86rf230_write_subreg(lp, SR_IRQ_MASK, 0);
1638         ieee802154_unregister_hw(lp->hw);
1639         ieee802154_free_hw(lp->hw);
1640         dev_dbg(&spi->dev, "unregistered at86rf230\n");
1641 }
1642
1643 static const struct of_device_id at86rf230_of_match[] = {
1644         { .compatible = "atmel,at86rf230", },
1645         { .compatible = "atmel,at86rf231", },
1646         { .compatible = "atmel,at86rf233", },
1647         { .compatible = "atmel,at86rf212", },
1648         { },
1649 };
1650 MODULE_DEVICE_TABLE(of, at86rf230_of_match);
1651
1652 static const struct spi_device_id at86rf230_device_id[] = {
1653         { .name = "at86rf230", },
1654         { .name = "at86rf231", },
1655         { .name = "at86rf233", },
1656         { .name = "at86rf212", },
1657         { },
1658 };
1659 MODULE_DEVICE_TABLE(spi, at86rf230_device_id);
1660
1661 static struct spi_driver at86rf230_driver = {
1662         .id_table = at86rf230_device_id,
1663         .driver = {
1664                 .of_match_table = at86rf230_of_match,
1665                 .name   = "at86rf230",
1666         },
1667         .probe      = at86rf230_probe,
1668         .remove     = at86rf230_remove,
1669 };
1670
1671 module_spi_driver(at86rf230_driver);
1672
1673 MODULE_DESCRIPTION("AT86RF230 Transceiver Driver");
1674 MODULE_LICENSE("GPL v2");