drivers/net/ieee802154/at86rf230.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * AT86RF230/RF231 driver
   4  *
   5  * Copyright (C) 2009-2012 Siemens AG
   6  *
   7  * Written by:
   8  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
   9  * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
  10  * Alexander Aring <aar@pengutronix.de>
  11  */
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/hrtimer.h>
  15 #include <linux/jiffies.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/irq.h>
  18 #include <linux/gpio.h>
  19 #include <linux/delay.h>
  20 #include <linux/spi/spi.h>
  21 #include <linux/spi/at86rf230.h>
  22 #include <linux/regmap.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/of_gpio.h>
  25 #include <linux/ieee802154.h>
  26
  27 #include <net/mac802154.h>
  28 #include <net/cfg802154.h>
  29
  30 #include "at86rf230.h"
  31
  32 struct at86rf230_local;
  33 /* at86rf2xx chip depend data.
  34  * All timings are in us.
  35  */
  36 struct at86rf2xx_chip_data {
  37         u16 t_sleep_cycle;
  38         u16 t_channel_switch;
  39         u16 t_reset_to_off;
  40         u16 t_off_to_aack;
  41         u16 t_off_to_tx_on;
  42         u16 t_off_to_sleep;
  43         u16 t_sleep_to_off;
  44         u16 t_frame;
  45         u16 t_p_ack;
  46         int rssi_base_val;
  47
  48         int (*set_channel)(struct at86rf230_local *, u8, u8);
  49         int (*set_txpower)(struct at86rf230_local *, s32);
  50 };
  51
  52 #define AT86RF2XX_MAX_BUF               (127 + 3)
  53 /* tx retries to access the TX_ON state
  54  * if it's above then force change will be started.
  55  *
  56  * We assume the max_frame_retries (7) value of 802.15.4 here.
  57  */
  58 #define AT86RF2XX_MAX_TX_RETRIES        7
  59 /* We use the recommended 5 minutes timeout to recalibrate */
  60 #define AT86RF2XX_CAL_LOOP_TIMEOUT      (5 * 60 * HZ)
  61
  62 struct at86rf230_state_change {
  63         struct at86rf230_local *lp;
  64         int irq;
  65
  66         struct hrtimer timer;
  67         struct spi_message msg;
  68         struct spi_transfer trx;
  69         u8 buf[AT86RF2XX_MAX_BUF];
  70
  71         void (*complete)(void *context);
  72         u8 from_state;
  73         u8 to_state;
  74         int trac;
  75
  76         bool free;
  77 };
  78
  79 struct at86rf230_local {
  80         struct spi_device *spi;
  81
  82         struct ieee802154_hw *hw;
  83         struct at86rf2xx_chip_data *data;
  84         struct regmap *regmap;
  85         int slp_tr;
  86         bool sleep;
  87
  88         struct completion state_complete;
  89         struct at86rf230_state_change state;
  90
  91         unsigned long cal_timeout;
  92         bool is_tx;
  93         bool is_tx_from_off;
  94         bool was_tx;
  95         u8 tx_retry;
  96         struct sk_buff *tx_skb;
  97         struct at86rf230_state_change tx;
  98 };
  99
 100 #define AT86RF2XX_NUMREGS 0x3F
 101
 102 static void
 103 at86rf230_async_state_change(struct at86rf230_local *lp,
 104                              struct at86rf230_state_change *ctx,
 105                              const u8 state, void (*complete)(void *context));
 106
 107 static inline void
 108 at86rf230_sleep(struct at86rf230_local *lp)
 109 {
 110         if (gpio_is_valid(lp->slp_tr)) {
 111                 gpio_set_value(lp->slp_tr, 1);
 112                 usleep_range(lp->data->t_off_to_sleep,
 113                              lp->data->t_off_to_sleep + 10);
 114                 lp->sleep = true;
 115         }
 116 }
 117
 118 static inline void
 119 at86rf230_awake(struct at86rf230_local *lp)
 120 {
 121         if (gpio_is_valid(lp->slp_tr)) {
 122                 gpio_set_value(lp->slp_tr, 0);
 123                 usleep_range(lp->data->t_sleep_to_off,
 124                              lp->data->t_sleep_to_off + 100);
 125                 lp->sleep = false;
 126         }
 127 }
 128
 129 static inline int
 130 __at86rf230_write(struct at86rf230_local *lp,
 131                   unsigned int addr, unsigned int data)
 132 {
 133         bool sleep = lp->sleep;
 134         int ret;
 135
 136         /* awake for register setting if sleep */
 137         if (sleep)
 138                 at86rf230_awake(lp);
 139
 140         ret = regmap_write(lp->regmap, addr, data);
 141
 142         /* sleep again if was sleeping */
 143         if (sleep)
 144                 at86rf230_sleep(lp);
 145
 146         return ret;
 147 }
 148
 149 static inline int
 150 __at86rf230_read(struct at86rf230_local *lp,
 151                  unsigned int addr, unsigned int *data)
 152 {
 153         bool sleep = lp->sleep;
 154         int ret;
 155
 156         /* awake for register setting if sleep */
 157         if (sleep)
 158                 at86rf230_awake(lp);
 159
 160         ret = regmap_read(lp->regmap, addr, data);
 161
 162         /* sleep again if was sleeping */
 163         if (sleep)
 164                 at86rf230_sleep(lp);
 165
 166         return ret;
 167 }
 168
 169 static inline int
 170 at86rf230_read_subreg(struct at86rf230_local *lp,
 171                       unsigned int addr, unsigned int mask,
 172                       unsigned int shift, unsigned int *data)
 173 {
 174         int rc;
 175
 176         rc = __at86rf230_read(lp, addr, data);
 177         if (!rc)
 178                 *data = (*data & mask) >> shift;
 179
 180         return rc;
 181 }
 182
 183 static inline int
 184 at86rf230_write_subreg(struct at86rf230_local *lp,
 185                        unsigned int addr, unsigned int mask,
 186                        unsigned int shift, unsigned int data)
 187 {
 188         bool sleep = lp->sleep;
 189         int ret;
 190
 191         /* awake for register setting if sleep */
 192         if (sleep)
 193                 at86rf230_awake(lp);
 194
 195         ret = regmap_update_bits(lp->regmap, addr, mask, data << shift);
 196
 197         /* sleep again if was sleeping */
 198         if (sleep)
 199                 at86rf230_sleep(lp);
 200
 201         return ret;
 202 }
 203
 204 static inline void
 205 at86rf230_slp_tr_rising_edge(struct at86rf230_local *lp)
 206 {
 207         gpio_set_value(lp->slp_tr, 1);
 208         udelay(1);
 209         gpio_set_value(lp->slp_tr, 0);
 210 }
 211
 212 static bool
 213 at86rf230_reg_writeable(struct device *dev, unsigned int reg)
 214 {
 215         switch (reg) {
 216         case RG_TRX_STATE:
 217         case RG_TRX_CTRL_0:
 218         case RG_TRX_CTRL_1:
 219         case RG_PHY_TX_PWR:
 220         case RG_PHY_ED_LEVEL:
 221         case RG_PHY_CC_CCA:
 222         case RG_CCA_THRES:
 223         case RG_RX_CTRL:
 224         case RG_SFD_VALUE:
 225         case RG_TRX_CTRL_2:
 226         case RG_ANT_DIV:
 227         case RG_IRQ_MASK:
 228         case RG_VREG_CTRL:
 229         case RG_BATMON:
 230         case RG_XOSC_CTRL:
 231         case RG_RX_SYN:
 232         case RG_XAH_CTRL_1:
 233         case RG_FTN_CTRL:
 234         case RG_PLL_CF:
 235         case RG_PLL_DCU:
 236         case RG_SHORT_ADDR_0:
 237         case RG_SHORT_ADDR_1:
 238         case RG_PAN_ID_0:
 239         case RG_PAN_ID_1:
 240         case RG_IEEE_ADDR_0:
 241         case RG_IEEE_ADDR_1:
 242         case RG_IEEE_ADDR_2:
 243         case RG_IEEE_ADDR_3:
 244         case RG_IEEE_ADDR_4:
 245         case RG_IEEE_ADDR_5:
 246         case RG_IEEE_ADDR_6:
 247         case RG_IEEE_ADDR_7:
 248         case RG_XAH_CTRL_0:
 249         case RG_CSMA_SEED_0:
 250         case RG_CSMA_SEED_1:
 251         case RG_CSMA_BE:
 252                 return true;
 253         default:
 254                 return false;
 255         }
 256 }
 257
 258 static bool
 259 at86rf230_reg_readable(struct device *dev, unsigned int reg)
 260 {
 261         bool rc;
 262
 263         /* all writeable are also readable */
 264         rc = at86rf230_reg_writeable(dev, reg);
 265         if (rc)
 266                 return rc;
 267
 268         /* readonly regs */
 269         switch (reg) {
 270         case RG_TRX_STATUS:
 271         case RG_PHY_RSSI:
 272         case RG_IRQ_STATUS:
 273         case RG_PART_NUM:
 274         case RG_VERSION_NUM:
 275         case RG_MAN_ID_1:
 276         case RG_MAN_ID_0:
 277                 return true;
 278         default:
 279                 return false;
 280         }
 281 }
 282
 283 static bool
 284 at86rf230_reg_volatile(struct device *dev, unsigned int reg)
 285 {
 286         /* can be changed during runtime */
 287         switch (reg) {
 288         case RG_TRX_STATUS:
 289         case RG_TRX_STATE:
 290         case RG_PHY_RSSI:
 291         case RG_PHY_ED_LEVEL:
 292         case RG_IRQ_STATUS:
 293         case RG_VREG_CTRL:
 294         case RG_PLL_CF:
 295         case RG_PLL_DCU:
 296                 return true;
 297         default:
 298                 return false;
 299         }
 300 }
 301
 302 static bool
 303 at86rf230_reg_precious(struct device *dev, unsigned int reg)
 304 {
 305         /* don't clear irq line on read */
 306         switch (reg) {
 307         case RG_IRQ_STATUS:
 308                 return true;
 309         default:
 310                 return false;
 311         }
 312 }
 313
 314 static const struct regmap_config at86rf230_regmap_spi_config = {
 315         .reg_bits = 8,
 316         .val_bits = 8,
 317         .write_flag_mask = CMD_REG | CMD_WRITE,
 318         .read_flag_mask = CMD_REG,
 319         .cache_type = REGCACHE_RBTREE,
 320         .max_register = AT86RF2XX_NUMREGS,
 321         .writeable_reg = at86rf230_reg_writeable,
 322         .readable_reg = at86rf230_reg_readable,
 323         .volatile_reg = at86rf230_reg_volatile,
 324         .precious_reg = at86rf230_reg_precious,
 325 };
 326
 327 static void
 328 at86rf230_async_error_recover_complete(void *context)
 329 {
 330         struct at86rf230_state_change *ctx = context;
 331         struct at86rf230_local *lp = ctx->lp;
 332
 333         if (ctx->free)
 334                 kfree(ctx);
 335
 336         if (lp->was_tx) {
 337                 lp->was_tx = 0;
 338                 ieee802154_xmit_hw_error(lp->hw, lp->tx_skb);
 339         }
 340 }
 341
 342 static void
 343 at86rf230_async_error_recover(void *context)
 344 {
 345         struct at86rf230_state_change *ctx = context;
 346         struct at86rf230_local *lp = ctx->lp;
 347
 348         if (lp->is_tx) {
 349                 lp->was_tx = 1;
 350                 lp->is_tx = 0;
 351         }
 352
 353         at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON,
 354                                      at86rf230_async_error_recover_complete);
 355 }
 356
 357 static inline void
 358 at86rf230_async_error(struct at86rf230_local *lp,
 359                       struct at86rf230_state_change *ctx, int rc)
 360 {
 361         dev_err(&lp->spi->dev, "spi_async error %d\n", rc);
 362
 363         at86rf230_async_state_change(lp, ctx, STATE_FORCE_TRX_OFF,
 364                                      at86rf230_async_error_recover);
 365 }
 366
 367 /* Generic function to get some register value in async mode */
 368 static void
 369 at86rf230_async_read_reg(struct at86rf230_local *lp, u8 reg,
 370                          struct at86rf230_state_change *ctx,
 371                          void (*complete)(void *context))
 372 {
 373         int rc;
 374
 375         u8 *tx_buf = ctx->buf;
 376
 377         tx_buf[0] = (reg & CMD_REG_MASK) | CMD_REG;
 378         ctx->msg.complete = complete;
 379         rc = spi_async(lp->spi, &ctx->msg);
 380         if (rc)
 381                 at86rf230_async_error(lp, ctx, rc);
 382 }
 383
 384 static void
 385 at86rf230_async_write_reg(struct at86rf230_local *lp, u8 reg, u8 val,
 386                           struct at86rf230_state_change *ctx,
 387                           void (*complete)(void *context))
 388 {
 389         int rc;
 390
 391         ctx->buf[0] = (reg & CMD_REG_MASK) | CMD_REG | CMD_WRITE;
 392         ctx->buf[1] = val;
 393         ctx->msg.complete = complete;
 394         rc = spi_async(lp->spi, &ctx->msg);
 395         if (rc)
 396                 at86rf230_async_error(lp, ctx, rc);
 397 }
 398
 399 static void
 400 at86rf230_async_state_assert(void *context)
 401 {
 402         struct at86rf230_state_change *ctx = context;
 403         struct at86rf230_local *lp = ctx->lp;
 404         const u8 *buf = ctx->buf;
 405         const u8 trx_state = buf[1] & TRX_STATE_MASK;
 406
 407         /* Assert state change */
 408         if (trx_state != ctx->to_state) {
 409                 /* Special handling if transceiver state is in
 410                  * STATE_BUSY_RX_AACK and a SHR was detected.
 411                  */
 412                 if  (trx_state == STATE_BUSY_RX_AACK) {
 413                         /* Undocumented race condition. If we send a state
 414                          * change to STATE_RX_AACK_ON the transceiver could
 415                          * change his state automatically to STATE_BUSY_RX_AACK
 416                          * if a SHR was detected. This is not an error, but we
 417                          * can't assert this.
 418                          */
 419                         if (ctx->to_state == STATE_RX_AACK_ON)
 420                                 goto done;
 421
 422                         /* If we change to STATE_TX_ON without forcing and
 423                          * transceiver state is STATE_BUSY_RX_AACK, we wait
 424                          * 'tFrame + tPAck' receiving time. In this time the
 425                          * PDU should be received. If the transceiver is still
 426                          * in STATE_BUSY_RX_AACK, we run a force state change
 427                          * to STATE_TX_ON. This is a timeout handling, if the
 428                          * transceiver stucks in STATE_BUSY_RX_AACK.
 429                          *
 430                          * Additional we do several retries to try to get into
 431                          * TX_ON state without forcing. If the retries are
 432                          * higher or equal than AT86RF2XX_MAX_TX_RETRIES we
 433                          * will do a force change.
 434                          */
 435                         if (ctx->to_state == STATE_TX_ON ||
 436                             ctx->to_state == STATE_TRX_OFF) {
 437                                 u8 state = ctx->to_state;
 438
 439                                 if (lp->tx_retry >= AT86RF2XX_MAX_TX_RETRIES)
 440                                         state = STATE_FORCE_TRX_OFF;
 441                                 lp->tx_retry++;
 442
 443                                 at86rf230_async_state_change(lp, ctx, state,
 444                                                              ctx->complete);
 445                                 return;
 446                         }
 447                 }
 448
 449                 dev_warn(&lp->spi->dev, "unexcept state change from 0x%02x to 0x%02x. Actual state: 0x%02x\n",
 450                          ctx->from_state, ctx->to_state, trx_state);
 451         }
 452
 453 done:
 454         if (ctx->complete)
 455                 ctx->complete(context);
 456 }
 457
 458 static enum hrtimer_restart at86rf230_async_state_timer(struct hrtimer *timer)
 459 {
 460         struct at86rf230_state_change *ctx =
 461                 container_of(timer, struct at86rf230_state_change, timer);
 462         struct at86rf230_local *lp = ctx->lp;
 463
 464         at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 465                                  at86rf230_async_state_assert);
 466
 467         return HRTIMER_NORESTART;
 468 }
 469
 470 /* Do state change timing delay. */
 471 static void
 472 at86rf230_async_state_delay(void *context)
 473 {
 474         struct at86rf230_state_change *ctx = context;
 475         struct at86rf230_local *lp = ctx->lp;
 476         struct at86rf2xx_chip_data *c = lp->data;
 477         bool force = false;
 478         ktime_t tim;
 479
 480         /* The force state changes are will show as normal states in the
 481          * state status subregister. We change the to_state to the
 482          * corresponding one and remember if it was a force change, this
 483          * differs if we do a state change from STATE_BUSY_RX_AACK.
 484          */
 485         switch (ctx->to_state) {
 486         case STATE_FORCE_TX_ON:
 487                 ctx->to_state = STATE_TX_ON;
 488                 force = true;
 489                 break;
 490         case STATE_FORCE_TRX_OFF:
 491                 ctx->to_state = STATE_TRX_OFF;
 492                 force = true;
 493                 break;
 494         default:
 495                 break;
 496         }
 497
 498         switch (ctx->from_state) {
 499         case STATE_TRX_OFF:
 500                 switch (ctx->to_state) {
 501                 case STATE_RX_AACK_ON:
 502                         tim = c->t_off_to_aack * NSEC_PER_USEC;
 503                         /* state change from TRX_OFF to RX_AACK_ON to do a
 504                          * calibration, we need to reset the timeout for the
 505                          * next one.
 506                          */
 507                         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
 508                         goto change;
 509                 case STATE_TX_ARET_ON:
 510                 case STATE_TX_ON:
 511                         tim = c->t_off_to_tx_on * NSEC_PER_USEC;
 512                         /* state change from TRX_OFF to TX_ON or ARET_ON to do
 513                          * a calibration, we need to reset the timeout for the
 514                          * next one.
 515                          */
 516                         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
 517                         goto change;
 518                 default:
 519                         break;
 520                 }
 521                 break;
 522         case STATE_BUSY_RX_AACK:
 523                 switch (ctx->to_state) {
 524                 case STATE_TRX_OFF:
 525                 case STATE_TX_ON:
 526                         /* Wait for worst case receiving time if we
 527                          * didn't make a force change from BUSY_RX_AACK
 528                          * to TX_ON or TRX_OFF.
 529                          */
 530                         if (!force) {
 531                                 tim = (c->t_frame + c->t_p_ack) * NSEC_PER_USEC;
 532                                 goto change;
 533                         }
 534                         break;
 535                 default:
 536                         break;
 537                 }
 538                 break;
 539         /* Default value, means RESET state */
 540         case STATE_P_ON:
 541                 switch (ctx->to_state) {
 542                 case STATE_TRX_OFF:
 543                         tim = c->t_reset_to_off * NSEC_PER_USEC;
 544                         goto change;
 545                 default:
 546                         break;
 547                 }
 548                 break;
 549         default:
 550                 break;
 551         }
 552
 553         /* Default delay is 1us in the most cases */
 554         udelay(1);
 555         at86rf230_async_state_timer(&ctx->timer);
 556         return;
 557
 558 change:
 559         hrtimer_start(&ctx->timer, tim, HRTIMER_MODE_REL);
 560 }
 561
 562 static void
 563 at86rf230_async_state_change_start(void *context)
 564 {
 565         struct at86rf230_state_change *ctx = context;
 566         struct at86rf230_local *lp = ctx->lp;
 567         u8 *buf = ctx->buf;
 568         const u8 trx_state = buf[1] & TRX_STATE_MASK;
 569
 570         /* Check for "possible" STATE_TRANSITION_IN_PROGRESS */
 571         if (trx_state == STATE_TRANSITION_IN_PROGRESS) {
 572                 udelay(1);
 573                 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 574                                          at86rf230_async_state_change_start);
 575                 return;
 576         }
 577
 578         /* Check if we already are in the state which we change in */
 579         if (trx_state == ctx->to_state) {
 580                 if (ctx->complete)
 581                         ctx->complete(context);
 582                 return;
 583         }
 584
 585         /* Set current state to the context of state change */
 586         ctx->from_state = trx_state;
 587
 588         /* Going into the next step for a state change which do a timing
 589          * relevant delay.
 590          */
 591         at86rf230_async_write_reg(lp, RG_TRX_STATE, ctx->to_state, ctx,
 592                                   at86rf230_async_state_delay);
 593 }
 594
 595 static void
 596 at86rf230_async_state_change(struct at86rf230_local *lp,
 597                              struct at86rf230_state_change *ctx,
 598                              const u8 state, void (*complete)(void *context))
 599 {
 600         /* Initialization for the state change context */
 601         ctx->to_state = state;
 602         ctx->complete = complete;
 603         at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 604                                  at86rf230_async_state_change_start);
 605 }
 606
 607 static void
 608 at86rf230_sync_state_change_complete(void *context)
 609 {
 610         struct at86rf230_state_change *ctx = context;
 611         struct at86rf230_local *lp = ctx->lp;
 612
 613         complete(&lp->state_complete);
 614 }
 615
 616 /* This function do a sync framework above the async state change.
 617  * Some callbacks of the IEEE 802.15.4 driver interface need to be
 618  * handled synchronously.
 619  */
 620 static int
 621 at86rf230_sync_state_change(struct at86rf230_local *lp, unsigned int state)
 622 {
 623         unsigned long rc;
 624
 625         at86rf230_async_state_change(lp, &lp->state, state,
 626                                      at86rf230_sync_state_change_complete);
 627
 628         rc = wait_for_completion_timeout(&lp->state_complete,
 629                                          msecs_to_jiffies(100));
 630         if (!rc) {
 631                 at86rf230_async_error(lp, &lp->state, -ETIMEDOUT);
 632                 return -ETIMEDOUT;
 633         }
 634
 635         return 0;
 636 }
 637
 638 static void
 639 at86rf230_tx_complete(void *context)
 640 {
 641         struct at86rf230_state_change *ctx = context;
 642         struct at86rf230_local *lp = ctx->lp;
 643
 644         if (ctx->trac == IEEE802154_SUCCESS)
 645                 ieee802154_xmit_complete(lp->hw, lp->tx_skb, false);
 646         else
 647                 ieee802154_xmit_error(lp->hw, lp->tx_skb, ctx->trac);
 648
 649         kfree(ctx);
 650 }
 651
 652 static void
 653 at86rf230_tx_on(void *context)
 654 {
 655         struct at86rf230_state_change *ctx = context;
 656         struct at86rf230_local *lp = ctx->lp;
 657
 658         at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON,
 659                                      at86rf230_tx_complete);
 660 }
 661
 662 static void
 663 at86rf230_tx_trac_check(void *context)
 664 {
 665         struct at86rf230_state_change *ctx = context;
 666         struct at86rf230_local *lp = ctx->lp;
 667         u8 trac = TRAC_MASK(ctx->buf[1]);
 668
 669         switch (trac) {
 670         case TRAC_SUCCESS:
 671         case TRAC_SUCCESS_DATA_PENDING:
 672                 ctx->trac = IEEE802154_SUCCESS;
 673                 break;
 674         case TRAC_CHANNEL_ACCESS_FAILURE:
 675                 ctx->trac = IEEE802154_CHANNEL_ACCESS_FAILURE;
 676                 break;
 677         case TRAC_NO_ACK:
 678                 ctx->trac = IEEE802154_NO_ACK;
 679                 break;
 680         default:
 681                 ctx->trac = IEEE802154_SYSTEM_ERROR;
 682         }
 683
 684         at86rf230_async_state_change(lp, ctx, STATE_TX_ON, at86rf230_tx_on);
 685 }
 686
 687 static void
 688 at86rf230_rx_read_frame_complete(void *context)
 689 {
 690         struct at86rf230_state_change *ctx = context;
 691         struct at86rf230_local *lp = ctx->lp;
 692         const u8 *buf = ctx->buf;
 693         struct sk_buff *skb;
 694         u8 len, lqi;
 695
 696         len = buf[1];
 697         if (!ieee802154_is_valid_psdu_len(len)) {
 698                 dev_vdbg(&lp->spi->dev, "corrupted frame received\n");
 699                 len = IEEE802154_MTU;
 700         }
 701         lqi = buf[2 + len];
 702
 703         skb = dev_alloc_skb(IEEE802154_MTU);
 704         if (!skb) {
 705                 dev_vdbg(&lp->spi->dev, "failed to allocate sk_buff\n");
 706                 kfree(ctx);
 707                 return;
 708         }
 709
 710         skb_put_data(skb, buf + 2, len);
 711         ieee802154_rx_irqsafe(lp->hw, skb, lqi);
 712         kfree(ctx);
 713 }
 714
 715 static void
 716 at86rf230_rx_trac_check(void *context)
 717 {
 718         struct at86rf230_state_change *ctx = context;
 719         struct at86rf230_local *lp = ctx->lp;
 720         u8 *buf = ctx->buf;
 721         int rc;
 722
 723         buf[0] = CMD_FB;
 724         ctx->trx.len = AT86RF2XX_MAX_BUF;
 725         ctx->msg.complete = at86rf230_rx_read_frame_complete;
 726         rc = spi_async(lp->spi, &ctx->msg);
 727         if (rc) {
 728                 ctx->trx.len = 2;
 729                 at86rf230_async_error(lp, ctx, rc);
 730         }
 731 }
 732
 733 static void
 734 at86rf230_irq_trx_end(void *context)
 735 {
 736         struct at86rf230_state_change *ctx = context;
 737         struct at86rf230_local *lp = ctx->lp;
 738
 739         if (lp->is_tx) {
 740                 lp->is_tx = 0;
 741                 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx,
 742                                          at86rf230_tx_trac_check);
 743         } else {
 744                 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx,
 745                                          at86rf230_rx_trac_check);
 746         }
 747 }
 748
 749 static void
 750 at86rf230_irq_status(void *context)
 751 {
 752         struct at86rf230_state_change *ctx = context;
 753         struct at86rf230_local *lp = ctx->lp;
 754         const u8 *buf = ctx->buf;
 755         u8 irq = buf[1];
 756
 757         enable_irq(lp->spi->irq);
 758
 759         if (irq & IRQ_TRX_END) {
 760                 at86rf230_irq_trx_end(ctx);
 761         } else {
 762                 dev_err(&lp->spi->dev, "not supported irq %02x received\n",
 763                         irq);
 764                 kfree(ctx);
 765         }
 766 }
 767
 768 static void
 769 at86rf230_setup_spi_messages(struct at86rf230_local *lp,
 770                              struct at86rf230_state_change *state)
 771 {
 772         state->lp = lp;
 773         state->irq = lp->spi->irq;
 774         spi_message_init(&state->msg);
 775         state->msg.context = state;
 776         state->trx.len = 2;
 777         state->trx.tx_buf = state->buf;
 778         state->trx.rx_buf = state->buf;
 779         spi_message_add_tail(&state->trx, &state->msg);
 780         hrtimer_init(&state->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 781         state->timer.function = at86rf230_async_state_timer;
 782 }
 783
 784 static irqreturn_t at86rf230_isr(int irq, void *data)
 785 {
 786         struct at86rf230_local *lp = data;
 787         struct at86rf230_state_change *ctx;
 788         int rc;
 789
 790         disable_irq_nosync(irq);
 791
 792         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 793         if (!ctx) {
 794                 enable_irq(irq);
 795                 return IRQ_NONE;
 796         }
 797
 798         at86rf230_setup_spi_messages(lp, ctx);
 799         /* tell on error handling to free ctx */
 800         ctx->free = true;
 801
 802         ctx->buf[0] = (RG_IRQ_STATUS & CMD_REG_MASK) | CMD_REG;
 803         ctx->msg.complete = at86rf230_irq_status;
 804         rc = spi_async(lp->spi, &ctx->msg);
 805         if (rc) {
 806                 at86rf230_async_error(lp, ctx, rc);
 807                 enable_irq(irq);
 808                 return IRQ_NONE;
 809         }
 810
 811         return IRQ_HANDLED;
 812 }
 813
 814 static void
 815 at86rf230_write_frame_complete(void *context)
 816 {
 817         struct at86rf230_state_change *ctx = context;
 818         struct at86rf230_local *lp = ctx->lp;
 819
 820         ctx->trx.len = 2;
 821
 822         if (gpio_is_valid(lp->slp_tr))
 823                 at86rf230_slp_tr_rising_edge(lp);
 824         else
 825                 at86rf230_async_write_reg(lp, RG_TRX_STATE, STATE_BUSY_TX, ctx,
 826                                           NULL);
 827 }
 828
 829 static void
 830 at86rf230_write_frame(void *context)
 831 {
 832         struct at86rf230_state_change *ctx = context;
 833         struct at86rf230_local *lp = ctx->lp;
 834         struct sk_buff *skb = lp->tx_skb;
 835         u8 *buf = ctx->buf;
 836         int rc;
 837
 838         lp->is_tx = 1;
 839
 840         buf[0] = CMD_FB | CMD_WRITE;
 841         buf[1] = skb->len + 2;
 842         memcpy(buf + 2, skb->data, skb->len);
 843         ctx->trx.len = skb->len + 2;
 844         ctx->msg.complete = at86rf230_write_frame_complete;
 845         rc = spi_async(lp->spi, &ctx->msg);
 846         if (rc) {
 847                 ctx->trx.len = 2;
 848                 at86rf230_async_error(lp, ctx, rc);
 849         }
 850 }
 851
 852 static void
 853 at86rf230_xmit_tx_on(void *context)
 854 {
 855         struct at86rf230_state_change *ctx = context;
 856         struct at86rf230_local *lp = ctx->lp;
 857
 858         at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
 859                                      at86rf230_write_frame);
 860 }
 861
 862 static void
 863 at86rf230_xmit_start(void *context)
 864 {
 865         struct at86rf230_state_change *ctx = context;
 866         struct at86rf230_local *lp = ctx->lp;
 867
 868         /* check if we change from off state */
 869         if (lp->is_tx_from_off)
 870                 at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
 871                                              at86rf230_write_frame);
 872         else
 873                 at86rf230_async_state_change(lp, ctx, STATE_TX_ON,
 874                                              at86rf230_xmit_tx_on);
 875 }
 876
 877 static int
 878 at86rf230_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
 879 {
 880         struct at86rf230_local *lp = hw->priv;
 881         struct at86rf230_state_change *ctx = &lp->tx;
 882
 883         lp->tx_skb = skb;
 884         lp->tx_retry = 0;
 885
 886         /* After 5 minutes in PLL and the same frequency we run again the
 887          * calibration loops which is recommended by at86rf2xx datasheets.
 888          *
 889          * The calibration is initiate by a state change from TRX_OFF
 890          * to TX_ON, the lp->cal_timeout should be reinit by state_delay
 891          * function then to start in the next 5 minutes.
 892          */
 893         if (time_is_before_jiffies(lp->cal_timeout)) {
 894                 lp->is_tx_from_off = true;
 895                 at86rf230_async_state_change(lp, ctx, STATE_TRX_OFF,
 896                                              at86rf230_xmit_start);
 897         } else {
 898                 lp->is_tx_from_off = false;
 899                 at86rf230_xmit_start(ctx);
 900         }
 901
 902         return 0;
 903 }
 904
 905 static int
 906 at86rf230_ed(struct ieee802154_hw *hw, u8 *level)
 907 {
 908         WARN_ON(!level);
 909         *level = 0xbe;
 910         return 0;
 911 }
 912
 913 static int
 914 at86rf230_start(struct ieee802154_hw *hw)
 915 {
 916         struct at86rf230_local *lp = hw->priv;
 917
 918         at86rf230_awake(lp);
 919         enable_irq(lp->spi->irq);
 920
 921         return at86rf230_sync_state_change(lp, STATE_RX_AACK_ON);
 922 }
 923
 924 static void
 925 at86rf230_stop(struct ieee802154_hw *hw)
 926 {
 927         struct at86rf230_local *lp = hw->priv;
 928         u8 csma_seed[2];
 929
 930         at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
 931
 932         disable_irq(lp->spi->irq);
 933
 934         /* It's recommended to set random new csma_seeds before sleep state.
 935          * Makes only sense in the stop callback, not doing this inside of
 936          * at86rf230_sleep, this is also used when we don't transmit afterwards
 937          * when calling start callback again.
 938          */
 939         get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
 940         at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
 941         at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
 942
 943         at86rf230_sleep(lp);
 944 }
 945
 946 static int
 947 at86rf23x_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
 948 {
 949         return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
 950 }
 951
 952 #define AT86RF2XX_MAX_ED_LEVELS 0xF
 953 static const s32 at86rf233_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = {
 954         -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000, -7800, -7600,
 955         -7400, -7200, -7000, -6800, -6600, -6400,
 956 };
 957
 958 static const s32 at86rf231_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = {
 959         -9100, -8900, -8700, -8500, -8300, -8100, -7900, -7700, -7500, -7300,
 960         -7100, -6900, -6700, -6500, -6300, -6100,
 961 };
 962
 963 static const s32 at86rf212_ed_levels_100[AT86RF2XX_MAX_ED_LEVELS + 1] = {
 964         -10000, -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200,
 965         -8000, -7800, -7600, -7400, -7200, -7000,
 966 };
 967
 968 static const s32 at86rf212_ed_levels_98[AT86RF2XX_MAX_ED_LEVELS + 1] = {
 969         -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000,
 970         -7800, -7600, -7400, -7200, -7000, -6800,
 971 };
 972
 973 static inline int
 974 at86rf212_update_cca_ed_level(struct at86rf230_local *lp, int rssi_base_val)
 975 {
 976         unsigned int cca_ed_thres;
 977         int rc;
 978
 979         rc = at86rf230_read_subreg(lp, SR_CCA_ED_THRES, &cca_ed_thres);
 980         if (rc < 0)
 981                 return rc;
 982
 983         switch (rssi_base_val) {
 984         case -98:
 985                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_98;
 986                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_98);
 987                 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_98[cca_ed_thres];
 988                 break;
 989         case -100:
 990                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
 991                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
 992                 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_100[cca_ed_thres];
 993                 break;
 994         default:
 995                 WARN_ON(1);
 996         }
 997
 998         return 0;
 999 }
1000
1001 static int
1002 at86rf212_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
1003 {
1004         int rc;
1005
1006         if (channel == 0)
1007                 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 0);
1008         else
1009                 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 1);
1010         if (rc < 0)
1011                 return rc;
1012
1013         if (page == 0) {
1014                 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 0);
1015                 lp->data->rssi_base_val = -100;
1016         } else {
1017                 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 1);
1018                 lp->data->rssi_base_val = -98;
1019         }
1020         if (rc < 0)
1021                 return rc;
1022
1023         rc = at86rf212_update_cca_ed_level(lp, lp->data->rssi_base_val);
1024         if (rc < 0)
1025                 return rc;
1026
1027         return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
1028 }
1029
1030 static int
1031 at86rf230_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
1032 {
1033         struct at86rf230_local *lp = hw->priv;
1034         int rc;
1035
1036         rc = lp->data->set_channel(lp, page, channel);
1037         /* Wait for PLL */
1038         usleep_range(lp->data->t_channel_switch,
1039                      lp->data->t_channel_switch + 10);
1040
1041         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
1042         return rc;
1043 }
1044
1045 static int
1046 at86rf230_set_hw_addr_filt(struct ieee802154_hw *hw,
1047                            struct ieee802154_hw_addr_filt *filt,
1048                            unsigned long changed)
1049 {
1050         struct at86rf230_local *lp = hw->priv;
1051
1052         if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
1053                 u16 addr = le16_to_cpu(filt->short_addr);
1054
1055                 dev_vdbg(&lp->spi->dev, "%s called for saddr\n", __func__);
1056                 __at86rf230_write(lp, RG_SHORT_ADDR_0, addr);
1057                 __at86rf230_write(lp, RG_SHORT_ADDR_1, addr >> 8);
1058         }
1059
1060         if (changed & IEEE802154_AFILT_PANID_CHANGED) {
1061                 u16 pan = le16_to_cpu(filt->pan_id);
1062
1063                 dev_vdbg(&lp->spi->dev, "%s called for pan id\n", __func__);
1064                 __at86rf230_write(lp, RG_PAN_ID_0, pan);
1065                 __at86rf230_write(lp, RG_PAN_ID_1, pan >> 8);
1066         }
1067
1068         if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
1069                 u8 i, addr[8];
1070
1071                 memcpy(addr, &filt->ieee_addr, 8);
1072                 dev_vdbg(&lp->spi->dev, "%s called for IEEE addr\n", __func__);
1073                 for (i = 0; i < 8; i++)
1074                         __at86rf230_write(lp, RG_IEEE_ADDR_0 + i, addr[i]);
1075         }
1076
1077         if (changed & IEEE802154_AFILT_PANC_CHANGED) {
1078                 dev_vdbg(&lp->spi->dev, "%s called for panc change\n", __func__);
1079                 if (filt->pan_coord)
1080                         at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 1);
1081                 else
1082                         at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 0);
1083         }
1084
1085         return 0;
1086 }
1087
1088 #define AT86RF23X_MAX_TX_POWERS 0xF
1089 static const s32 at86rf233_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1090         400, 370, 340, 300, 250, 200, 100, 0, -100, -200, -300, -400, -600,
1091         -800, -1200, -1700,
1092 };
1093
1094 static const s32 at86rf231_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1095         300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700,
1096         -900, -1200, -1700,
1097 };
1098
1099 #define AT86RF212_MAX_TX_POWERS 0x1F
1100 static const s32 at86rf212_powers[AT86RF212_MAX_TX_POWERS + 1] = {
1101         500, 400, 300, 200, 100, 0, -100, -200, -300, -400, -500, -600, -700,
1102         -800, -900, -1000, -1100, -1200, -1300, -1400, -1500, -1600, -1700,
1103         -1800, -1900, -2000, -2100, -2200, -2300, -2400, -2500, -2600,
1104 };
1105
1106 static int
1107 at86rf23x_set_txpower(struct at86rf230_local *lp, s32 mbm)
1108 {
1109         u32 i;
1110
1111         for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1112                 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1113                         return at86rf230_write_subreg(lp, SR_TX_PWR_23X, i);
1114         }
1115
1116         return -EINVAL;
1117 }
1118
1119 static int
1120 at86rf212_set_txpower(struct at86rf230_local *lp, s32 mbm)
1121 {
1122         u32 i;
1123
1124         for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1125                 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1126                         return at86rf230_write_subreg(lp, SR_TX_PWR_212, i);
1127         }
1128
1129         return -EINVAL;
1130 }
1131
1132 static int
1133 at86rf230_set_txpower(struct ieee802154_hw *hw, s32 mbm)
1134 {
1135         struct at86rf230_local *lp = hw->priv;
1136
1137         return lp->data->set_txpower(lp, mbm);
1138 }
1139
1140 static int
1141 at86rf230_set_lbt(struct ieee802154_hw *hw, bool on)
1142 {
1143         struct at86rf230_local *lp = hw->priv;
1144
1145         return at86rf230_write_subreg(lp, SR_CSMA_LBT_MODE, on);
1146 }
1147
1148 static int
1149 at86rf230_set_cca_mode(struct ieee802154_hw *hw,
1150                        const struct wpan_phy_cca *cca)
1151 {
1152         struct at86rf230_local *lp = hw->priv;
1153         u8 val;
1154
1155         /* mapping 802.15.4 to driver spec */
1156         switch (cca->mode) {
1157         case NL802154_CCA_ENERGY:
1158                 val = 1;
1159                 break;
1160         case NL802154_CCA_CARRIER:
1161                 val = 2;
1162                 break;
1163         case NL802154_CCA_ENERGY_CARRIER:
1164                 switch (cca->opt) {
1165                 case NL802154_CCA_OPT_ENERGY_CARRIER_AND:
1166                         val = 3;
1167                         break;
1168                 case NL802154_CCA_OPT_ENERGY_CARRIER_OR:
1169                         val = 0;
1170                         break;
1171                 default:
1172                         return -EINVAL;
1173                 }
1174                 break;
1175         default:
1176                 return -EINVAL;
1177         }
1178
1179         return at86rf230_write_subreg(lp, SR_CCA_MODE, val);
1180 }
1181
1182 static int
1183 at86rf230_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
1184 {
1185         struct at86rf230_local *lp = hw->priv;
1186         u32 i;
1187
1188         for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) {
1189                 if (hw->phy->supported.cca_ed_levels[i] == mbm)
1190                         return at86rf230_write_subreg(lp, SR_CCA_ED_THRES, i);
1191         }
1192
1193         return -EINVAL;
1194 }
1195
1196 static int
1197 at86rf230_set_csma_params(struct ieee802154_hw *hw, u8 min_be, u8 max_be,
1198                           u8 retries)
1199 {
1200         struct at86rf230_local *lp = hw->priv;
1201         int rc;
1202
1203         rc = at86rf230_write_subreg(lp, SR_MIN_BE, min_be);
1204         if (rc)
1205                 return rc;
1206
1207         rc = at86rf230_write_subreg(lp, SR_MAX_BE, max_be);
1208         if (rc)
1209                 return rc;
1210
1211         return at86rf230_write_subreg(lp, SR_MAX_CSMA_RETRIES, retries);
1212 }
1213
1214 static int
1215 at86rf230_set_frame_retries(struct ieee802154_hw *hw, s8 retries)
1216 {
1217         struct at86rf230_local *lp = hw->priv;
1218
1219         return at86rf230_write_subreg(lp, SR_MAX_FRAME_RETRIES, retries);
1220 }
1221
1222 static int
1223 at86rf230_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
1224 {
1225         struct at86rf230_local *lp = hw->priv;
1226         int rc;
1227
1228         if (on) {
1229                 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 1);
1230                 if (rc < 0)
1231                         return rc;
1232
1233                 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 1);
1234                 if (rc < 0)
1235                         return rc;
1236         } else {
1237                 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 0);
1238                 if (rc < 0)
1239                         return rc;
1240
1241                 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 0);
1242                 if (rc < 0)
1243                         return rc;
1244         }
1245
1246         return 0;
1247 }
1248
1249 static const struct ieee802154_ops at86rf230_ops = {
1250         .owner = THIS_MODULE,
1251         .xmit_async = at86rf230_xmit,
1252         .ed = at86rf230_ed,
1253         .set_channel = at86rf230_channel,
1254         .start = at86rf230_start,
1255         .stop = at86rf230_stop,
1256         .set_hw_addr_filt = at86rf230_set_hw_addr_filt,
1257         .set_txpower = at86rf230_set_txpower,
1258         .set_lbt = at86rf230_set_lbt,
1259         .set_cca_mode = at86rf230_set_cca_mode,
1260         .set_cca_ed_level = at86rf230_set_cca_ed_level,
1261         .set_csma_params = at86rf230_set_csma_params,
1262         .set_frame_retries = at86rf230_set_frame_retries,
1263         .set_promiscuous_mode = at86rf230_set_promiscuous_mode,
1264 };
1265
1266 static struct at86rf2xx_chip_data at86rf233_data = {
1267         .t_sleep_cycle = 330,
1268         .t_channel_switch = 11,
1269         .t_reset_to_off = 26,
1270         .t_off_to_aack = 80,
1271         .t_off_to_tx_on = 80,
1272         .t_off_to_sleep = 35,
1273         .t_sleep_to_off = 1000,
1274         .t_frame = 4096,
1275         .t_p_ack = 545,
1276         .rssi_base_val = -94,
1277         .set_channel = at86rf23x_set_channel,
1278         .set_txpower = at86rf23x_set_txpower,
1279 };
1280
1281 static struct at86rf2xx_chip_data at86rf231_data = {
1282         .t_sleep_cycle = 330,
1283         .t_channel_switch = 24,
1284         .t_reset_to_off = 37,
1285         .t_off_to_aack = 110,
1286         .t_off_to_tx_on = 110,
1287         .t_off_to_sleep = 35,
1288         .t_sleep_to_off = 1000,
1289         .t_frame = 4096,
1290         .t_p_ack = 545,
1291         .rssi_base_val = -91,
1292         .set_channel = at86rf23x_set_channel,
1293         .set_txpower = at86rf23x_set_txpower,
1294 };
1295
1296 static struct at86rf2xx_chip_data at86rf212_data = {
1297         .t_sleep_cycle = 330,
1298         .t_channel_switch = 11,
1299         .t_reset_to_off = 26,
1300         .t_off_to_aack = 200,
1301         .t_off_to_tx_on = 200,
1302         .t_off_to_sleep = 35,
1303         .t_sleep_to_off = 1000,
1304         .t_frame = 4096,
1305         .t_p_ack = 545,
1306         .rssi_base_val = -100,
1307         .set_channel = at86rf212_set_channel,
1308         .set_txpower = at86rf212_set_txpower,
1309 };
1310
1311 static int at86rf230_hw_init(struct at86rf230_local *lp, u8 xtal_trim)
1312 {
1313         int rc, irq_type, irq_pol = IRQ_ACTIVE_HIGH;
1314         unsigned int dvdd;
1315         u8 csma_seed[2];
1316
1317         rc = at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
1318         if (rc)
1319                 return rc;
1320
1321         irq_type = irq_get_trigger_type(lp->spi->irq);
1322         if (irq_type == IRQ_TYPE_EDGE_FALLING ||
1323             irq_type == IRQ_TYPE_LEVEL_LOW)
1324                 irq_pol = IRQ_ACTIVE_LOW;
1325
1326         rc = at86rf230_write_subreg(lp, SR_IRQ_POLARITY, irq_pol);
1327         if (rc)
1328                 return rc;
1329
1330         rc = at86rf230_write_subreg(lp, SR_RX_SAFE_MODE, 1);
1331         if (rc)
1332                 return rc;
1333
1334         rc = at86rf230_write_subreg(lp, SR_IRQ_MASK, IRQ_TRX_END);
1335         if (rc)
1336                 return rc;
1337
1338         /* reset values differs in at86rf231 and at86rf233 */
1339         rc = at86rf230_write_subreg(lp, SR_IRQ_MASK_MODE, 0);
1340         if (rc)
1341                 return rc;
1342
1343         get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
1344         rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
1345         if (rc)
1346                 return rc;
1347         rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
1348         if (rc)
1349                 return rc;
1350
1351         /* CLKM changes are applied immediately */
1352         rc = at86rf230_write_subreg(lp, SR_CLKM_SHA_SEL, 0x00);
1353         if (rc)
1354                 return rc;
1355
1356         /* Turn CLKM Off */
1357         rc = at86rf230_write_subreg(lp, SR_CLKM_CTRL, 0x00);
1358         if (rc)
1359                 return rc;
1360         /* Wait the next SLEEP cycle */
1361         usleep_range(lp->data->t_sleep_cycle,
1362                      lp->data->t_sleep_cycle + 100);
1363
1364         /* xtal_trim value is calculated by:
1365          * CL = 0.5 * (CX + CTRIM + CPAR)
1366          *
1367          * whereas:
1368          * CL = capacitor of used crystal
1369          * CX = connected capacitors at xtal pins
1370          * CPAR = in all at86rf2xx datasheets this is a constant value 3 pF,
1371          *        but this is different on each board setup. You need to fine
1372          *        tuning this value via CTRIM.
1373          * CTRIM = variable capacitor setting. Resolution is 0.3 pF range is
1374          *         0 pF upto 4.5 pF.
1375          *
1376          * Examples:
1377          * atben transceiver:
1378          *
1379          * CL = 8 pF
1380          * CX = 12 pF
1381          * CPAR = 3 pF (We assume the magic constant from datasheet)
1382          * CTRIM = 0.9 pF
1383          *
1384          * (12+0.9+3)/2 = 7.95 which is nearly at 8 pF
1385          *
1386          * xtal_trim = 0x3
1387          *
1388          * openlabs transceiver:
1389          *
1390          * CL = 16 pF
1391          * CX = 22 pF
1392          * CPAR = 3 pF (We assume the magic constant from datasheet)
1393          * CTRIM = 4.5 pF
1394          *
1395          * (22+4.5+3)/2 = 14.75 which is the nearest value to 16 pF
1396          *
1397          * xtal_trim = 0xf
1398          */
1399         rc = at86rf230_write_subreg(lp, SR_XTAL_TRIM, xtal_trim);
1400         if (rc)
1401                 return rc;
1402
1403         rc = at86rf230_read_subreg(lp, SR_DVDD_OK, &dvdd);
1404         if (rc)
1405                 return rc;
1406         if (!dvdd) {
1407                 dev_err(&lp->spi->dev, "DVDD error\n");
1408                 return -EINVAL;
1409         }
1410
1411         /* Force setting slotted operation bit to 0. Sometimes the atben
1412          * sets this bit and I don't know why. We set this always force
1413          * to zero while probing.
1414          */
1415         return at86rf230_write_subreg(lp, SR_SLOTTED_OPERATION, 0);
1416 }
1417
1418 static int
1419 at86rf230_get_pdata(struct spi_device *spi, int *rstn, int *slp_tr,
1420                     u8 *xtal_trim)
1421 {
1422         struct at86rf230_platform_data *pdata = spi->dev.platform_data;
1423         int ret;
1424
1425         if (!IS_ENABLED(CONFIG_OF) || !spi->dev.of_node) {
1426                 if (!pdata)
1427                         return -ENOENT;
1428
1429                 *rstn = pdata->rstn;
1430                 *slp_tr = pdata->slp_tr;
1431                 *xtal_trim = pdata->xtal_trim;
1432                 return 0;
1433         }
1434
1435         *rstn = of_get_named_gpio(spi->dev.of_node, "reset-gpio", 0);
1436         *slp_tr = of_get_named_gpio(spi->dev.of_node, "sleep-gpio", 0);
1437         ret = of_property_read_u8(spi->dev.of_node, "xtal-trim", xtal_trim);
1438         if (ret < 0 && ret != -EINVAL)
1439                 return ret;
1440
1441         return 0;
1442 }
1443
1444 static int
1445 at86rf230_detect_device(struct at86rf230_local *lp)
1446 {
1447         unsigned int part, version, val;
1448         u16 man_id = 0;
1449         const char *chip;
1450         int rc;
1451
1452         rc = __at86rf230_read(lp, RG_MAN_ID_0, &val);
1453         if (rc)
1454                 return rc;
1455         man_id |= val;
1456
1457         rc = __at86rf230_read(lp, RG_MAN_ID_1, &val);
1458         if (rc)
1459                 return rc;
1460         man_id |= (val << 8);
1461
1462         rc = __at86rf230_read(lp, RG_PART_NUM, &part);
1463         if (rc)
1464                 return rc;
1465
1466         rc = __at86rf230_read(lp, RG_VERSION_NUM, &version);
1467         if (rc)
1468                 return rc;
1469
1470         if (man_id != 0x001f) {
1471                 dev_err(&lp->spi->dev, "Non-Atmel dev found (MAN_ID %02x %02x)\n",
1472                         man_id >> 8, man_id & 0xFF);
1473                 return -EINVAL;
1474         }
1475
1476         lp->hw->flags = IEEE802154_HW_TX_OMIT_CKSUM |
1477                         IEEE802154_HW_CSMA_PARAMS |
1478                         IEEE802154_HW_FRAME_RETRIES | IEEE802154_HW_AFILT |
1479                         IEEE802154_HW_PROMISCUOUS;
1480
1481         lp->hw->phy->flags = WPAN_PHY_FLAG_TXPOWER |
1482                              WPAN_PHY_FLAG_CCA_ED_LEVEL |
1483                              WPAN_PHY_FLAG_CCA_MODE;
1484
1485         lp->hw->phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY) |
1486                 BIT(NL802154_CCA_CARRIER) | BIT(NL802154_CCA_ENERGY_CARRIER);
1487         lp->hw->phy->supported.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND) |
1488                 BIT(NL802154_CCA_OPT_ENERGY_CARRIER_OR);
1489
1490         lp->hw->phy->cca.mode = NL802154_CCA_ENERGY;
1491
1492         switch (part) {
1493         case 2:
1494                 chip = "at86rf230";
1495                 rc = -ENOTSUPP;
1496                 goto not_supp;
1497         case 3:
1498                 chip = "at86rf231";
1499                 lp->data = &at86rf231_data;
1500                 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1501                 lp->hw->phy->current_channel = 11;
1502                 lp->hw->phy->supported.tx_powers = at86rf231_powers;
1503                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf231_powers);
1504                 lp->hw->phy->supported.cca_ed_levels = at86rf231_ed_levels;
1505                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf231_ed_levels);
1506                 break;
1507         case 7:
1508                 chip = "at86rf212";
1509                 lp->data = &at86rf212_data;
1510                 lp->hw->flags |= IEEE802154_HW_LBT;
1511                 lp->hw->phy->supported.channels[0] = 0x00007FF;
1512                 lp->hw->phy->supported.channels[2] = 0x00007FF;
1513                 lp->hw->phy->current_channel = 5;
1514                 lp->hw->phy->supported.lbt = NL802154_SUPPORTED_BOOL_BOTH;
1515                 lp->hw->phy->supported.tx_powers = at86rf212_powers;
1516                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf212_powers);
1517                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
1518                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
1519                 break;
1520         case 11:
1521                 chip = "at86rf233";
1522                 lp->data = &at86rf233_data;
1523                 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1524                 lp->hw->phy->current_channel = 13;
1525                 lp->hw->phy->supported.tx_powers = at86rf233_powers;
1526                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf233_powers);
1527                 lp->hw->phy->supported.cca_ed_levels = at86rf233_ed_levels;
1528                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf233_ed_levels);
1529                 break;
1530         default:
1531                 chip = "unknown";
1532                 rc = -ENOTSUPP;
1533                 goto not_supp;
1534         }
1535
1536         lp->hw->phy->cca_ed_level = lp->hw->phy->supported.cca_ed_levels[7];
1537         lp->hw->phy->transmit_power = lp->hw->phy->supported.tx_powers[0];
1538
1539 not_supp:
1540         dev_info(&lp->spi->dev, "Detected %s chip version %d\n", chip, version);
1541
1542         return rc;
1543 }
1544
1545 static int at86rf230_probe(struct spi_device *spi)
1546 {
1547         struct ieee802154_hw *hw;
1548         struct at86rf230_local *lp;
1549         unsigned int status;
1550         int rc, irq_type, rstn, slp_tr;
1551         u8 xtal_trim = 0;
1552
1553         if (!spi->irq) {
1554                 dev_err(&spi->dev, "no IRQ specified\n");
1555                 return -EINVAL;
1556         }
1557
1558         rc = at86rf230_get_pdata(spi, &rstn, &slp_tr, &xtal_trim);
1559         if (rc < 0) {
1560                 dev_err(&spi->dev, "failed to parse platform_data: %d\n", rc);
1561                 return rc;
1562         }
1563
1564         if (gpio_is_valid(rstn)) {
1565                 rc = devm_gpio_request_one(&spi->dev, rstn,
1566                                            GPIOF_OUT_INIT_HIGH, "rstn");
1567                 if (rc)
1568                         return rc;
1569         }
1570
1571         if (gpio_is_valid(slp_tr)) {
1572                 rc = devm_gpio_request_one(&spi->dev, slp_tr,
1573                                            GPIOF_OUT_INIT_LOW, "slp_tr");
1574                 if (rc)
1575                         return rc;
1576         }
1577
1578         /* Reset */
1579         if (gpio_is_valid(rstn)) {
1580                 udelay(1);
1581                 gpio_set_value_cansleep(rstn, 0);
1582                 udelay(1);
1583                 gpio_set_value_cansleep(rstn, 1);
1584                 usleep_range(120, 240);
1585         }
1586
1587         hw = ieee802154_alloc_hw(sizeof(*lp), &at86rf230_ops);
1588         if (!hw)
1589                 return -ENOMEM;
1590
1591         lp = hw->priv;
1592         lp->hw = hw;
1593         lp->spi = spi;
1594         lp->slp_tr = slp_tr;
1595         hw->parent = &spi->dev;
1596         ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
1597
1598         lp->regmap = devm_regmap_init_spi(spi, &at86rf230_regmap_spi_config);
1599         if (IS_ERR(lp->regmap)) {
1600                 rc = PTR_ERR(lp->regmap);
1601                 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
1602                         rc);
1603                 goto free_dev;
1604         }
1605
1606         at86rf230_setup_spi_messages(lp, &lp->state);
1607         at86rf230_setup_spi_messages(lp, &lp->tx);
1608
1609         rc = at86rf230_detect_device(lp);
1610         if (rc < 0)
1611                 goto free_dev;
1612
1613         init_completion(&lp->state_complete);
1614
1615         spi_set_drvdata(spi, lp);
1616
1617         rc = at86rf230_hw_init(lp, xtal_trim);
1618         if (rc)
1619                 goto free_dev;
1620
1621         /* Read irq status register to reset irq line */
1622         rc = at86rf230_read_subreg(lp, RG_IRQ_STATUS, 0xff, 0, &status);
1623         if (rc)
1624                 goto free_dev;
1625
1626         irq_type = irq_get_trigger_type(spi->irq);
1627         if (!irq_type)
1628                 irq_type = IRQF_TRIGGER_HIGH;
1629
1630         rc = devm_request_irq(&spi->dev, spi->irq, at86rf230_isr,
1631                               IRQF_SHARED | irq_type, dev_name(&spi->dev), lp);
1632         if (rc)
1633                 goto free_dev;
1634
1635         /* disable_irq by default and wait for starting hardware */
1636         disable_irq(spi->irq);
1637
1638         /* going into sleep by default */
1639         at86rf230_sleep(lp);
1640
1641         rc = ieee802154_register_hw(lp->hw);
1642         if (rc)
1643                 goto free_dev;
1644
1645         return rc;
1646
1647 free_dev:
1648         ieee802154_free_hw(lp->hw);
1649
1650         return rc;
1651 }
1652
1653 static void at86rf230_remove(struct spi_device *spi)
1654 {
1655         struct at86rf230_local *lp = spi_get_drvdata(spi);
1656
1657         /* mask all at86rf230 irq's */
1658         at86rf230_write_subreg(lp, SR_IRQ_MASK, 0);
1659         ieee802154_unregister_hw(lp->hw);
1660         ieee802154_free_hw(lp->hw);
1661         dev_dbg(&spi->dev, "unregistered at86rf230\n");
1662 }
1663
1664 static const struct of_device_id at86rf230_of_match[] = {
1665         { .compatible = "atmel,at86rf230", },
1666         { .compatible = "atmel,at86rf231", },
1667         { .compatible = "atmel,at86rf233", },
1668         { .compatible = "atmel,at86rf212", },
1669         { },
1670 };
1671 MODULE_DEVICE_TABLE(of, at86rf230_of_match);
1672
1673 static const struct spi_device_id at86rf230_device_id[] = {
1674         { .name = "at86rf230", },
1675         { .name = "at86rf231", },
1676         { .name = "at86rf233", },
1677         { .name = "at86rf212", },
1678         { },
1679 };
1680 MODULE_DEVICE_TABLE(spi, at86rf230_device_id);
1681
1682 static struct spi_driver at86rf230_driver = {
1683         .id_table = at86rf230_device_id,
1684         .driver = {
1685                 .of_match_table = of_match_ptr(at86rf230_of_match),
1686                 .name   = "at86rf230",
1687         },
1688         .probe      = at86rf230_probe,
1689         .remove     = at86rf230_remove,
1690 };
1691
1692 module_spi_driver(at86rf230_driver);
1693
1694 MODULE_DESCRIPTION("AT86RF230 Transceiver Driver");
1695 MODULE_LICENSE("GPL v2");