drivers/net/ieee802154/at86rf230.c

   1 /*
   2  * AT86RF230/RF231 driver
   3  *
   4  * Copyright (C) 2009-2012 Siemens AG
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * Written by:
  16  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
  17  * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
  18  * Alexander Aring <aar@pengutronix.de>
  19  */
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/hrtimer.h>
  23 #include <linux/jiffies.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/irq.h>
  26 #include <linux/gpio.h>
  27 #include <linux/delay.h>
  28 #include <linux/spi/spi.h>
  29 #include <linux/spi/at86rf230.h>
  30 #include <linux/regmap.h>
  31 #include <linux/skbuff.h>
  32 #include <linux/of_gpio.h>
  33 #include <linux/ieee802154.h>
  34 #include <linux/debugfs.h>
  35
  36 #include <net/mac802154.h>
  37 #include <net/cfg802154.h>
  38
  39 #include "at86rf230.h"
  40
  41 struct at86rf230_local;
  42 /* at86rf2xx chip depend data.
  43  * All timings are in us.
  44  */
  45 struct at86rf2xx_chip_data {
  46         u16 t_sleep_cycle;
  47         u16 t_channel_switch;
  48         u16 t_reset_to_off;
  49         u16 t_off_to_aack;
  50         u16 t_off_to_tx_on;
  51         u16 t_off_to_sleep;
  52         u16 t_sleep_to_off;
  53         u16 t_frame;
  54         u16 t_p_ack;
  55         int rssi_base_val;
  56
  57         int (*set_channel)(struct at86rf230_local *, u8, u8);
  58         int (*set_txpower)(struct at86rf230_local *, s32);
  59 };
  60
  61 #define AT86RF2XX_MAX_BUF               (127 + 3)
  62 /* tx retries to access the TX_ON state
  63  * if it's above then force change will be started.
  64  *
  65  * We assume the max_frame_retries (7) value of 802.15.4 here.
  66  */
  67 #define AT86RF2XX_MAX_TX_RETRIES        7
  68 /* We use the recommended 5 minutes timeout to recalibrate */
  69 #define AT86RF2XX_CAL_LOOP_TIMEOUT      (5 * 60 * HZ)
  70
  71 struct at86rf230_state_change {
  72         struct at86rf230_local *lp;
  73         int irq;
  74
  75         struct hrtimer timer;
  76         struct spi_message msg;
  77         struct spi_transfer trx;
  78         u8 buf[AT86RF2XX_MAX_BUF];
  79
  80         void (*complete)(void *context);
  81         u8 from_state;
  82         u8 to_state;
  83
  84         bool free;
  85 };
  86
  87 struct at86rf230_trac {
  88         u64 success;
  89         u64 success_data_pending;
  90         u64 success_wait_for_ack;
  91         u64 channel_access_failure;
  92         u64 no_ack;
  93         u64 invalid;
  94 };
  95
  96 struct at86rf230_local {
  97         struct spi_device *spi;
  98
  99         struct ieee802154_hw *hw;
 100         struct at86rf2xx_chip_data *data;
 101         struct regmap *regmap;
 102         int slp_tr;
 103         bool sleep;
 104
 105         struct completion state_complete;
 106         struct at86rf230_state_change state;
 107
 108         unsigned long cal_timeout;
 109         bool is_tx;
 110         bool is_tx_from_off;
 111         u8 tx_retry;
 112         struct sk_buff *tx_skb;
 113         struct at86rf230_state_change tx;
 114
 115         struct at86rf230_trac trac;
 116 };
 117
 118 #define AT86RF2XX_NUMREGS 0x3F
 119
 120 static void
 121 at86rf230_async_state_change(struct at86rf230_local *lp,
 122                              struct at86rf230_state_change *ctx,
 123                              const u8 state, void (*complete)(void *context));
 124
 125 static inline void
 126 at86rf230_sleep(struct at86rf230_local *lp)
 127 {
 128         if (gpio_is_valid(lp->slp_tr)) {
 129                 gpio_set_value(lp->slp_tr, 1);
 130                 usleep_range(lp->data->t_off_to_sleep,
 131                              lp->data->t_off_to_sleep + 10);
 132                 lp->sleep = true;
 133         }
 134 }
 135
 136 static inline void
 137 at86rf230_awake(struct at86rf230_local *lp)
 138 {
 139         if (gpio_is_valid(lp->slp_tr)) {
 140                 gpio_set_value(lp->slp_tr, 0);
 141                 usleep_range(lp->data->t_sleep_to_off,
 142                              lp->data->t_sleep_to_off + 100);
 143                 lp->sleep = false;
 144         }
 145 }
 146
 147 static inline int
 148 __at86rf230_write(struct at86rf230_local *lp,
 149                   unsigned int addr, unsigned int data)
 150 {
 151         bool sleep = lp->sleep;
 152         int ret;
 153
 154         /* awake for register setting if sleep */
 155         if (sleep)
 156                 at86rf230_awake(lp);
 157
 158         ret = regmap_write(lp->regmap, addr, data);
 159
 160         /* sleep again if was sleeping */
 161         if (sleep)
 162                 at86rf230_sleep(lp);
 163
 164         return ret;
 165 }
 166
 167 static inline int
 168 __at86rf230_read(struct at86rf230_local *lp,
 169                  unsigned int addr, unsigned int *data)
 170 {
 171         bool sleep = lp->sleep;
 172         int ret;
 173
 174         /* awake for register setting if sleep */
 175         if (sleep)
 176                 at86rf230_awake(lp);
 177
 178         ret = regmap_read(lp->regmap, addr, data);
 179
 180         /* sleep again if was sleeping */
 181         if (sleep)
 182                 at86rf230_sleep(lp);
 183
 184         return ret;
 185 }
 186
 187 static inline int
 188 at86rf230_read_subreg(struct at86rf230_local *lp,
 189                       unsigned int addr, unsigned int mask,
 190                       unsigned int shift, unsigned int *data)
 191 {
 192         int rc;
 193
 194         rc = __at86rf230_read(lp, addr, data);
 195         if (!rc)
 196                 *data = (*data & mask) >> shift;
 197
 198         return rc;
 199 }
 200
 201 static inline int
 202 at86rf230_write_subreg(struct at86rf230_local *lp,
 203                        unsigned int addr, unsigned int mask,
 204                        unsigned int shift, unsigned int data)
 205 {
 206         bool sleep = lp->sleep;
 207         int ret;
 208
 209         /* awake for register setting if sleep */
 210         if (sleep)
 211                 at86rf230_awake(lp);
 212
 213         ret = regmap_update_bits(lp->regmap, addr, mask, data << shift);
 214
 215         /* sleep again if was sleeping */
 216         if (sleep)
 217                 at86rf230_sleep(lp);
 218
 219         return ret;
 220 }
 221
 222 static inline void
 223 at86rf230_slp_tr_rising_edge(struct at86rf230_local *lp)
 224 {
 225         gpio_set_value(lp->slp_tr, 1);
 226         udelay(1);
 227         gpio_set_value(lp->slp_tr, 0);
 228 }
 229
 230 static bool
 231 at86rf230_reg_writeable(struct device *dev, unsigned int reg)
 232 {
 233         switch (reg) {
 234         case RG_TRX_STATE:
 235         case RG_TRX_CTRL_0:
 236         case RG_TRX_CTRL_1:
 237         case RG_PHY_TX_PWR:
 238         case RG_PHY_ED_LEVEL:
 239         case RG_PHY_CC_CCA:
 240         case RG_CCA_THRES:
 241         case RG_RX_CTRL:
 242         case RG_SFD_VALUE:
 243         case RG_TRX_CTRL_2:
 244         case RG_ANT_DIV:
 245         case RG_IRQ_MASK:
 246         case RG_VREG_CTRL:
 247         case RG_BATMON:
 248         case RG_XOSC_CTRL:
 249         case RG_RX_SYN:
 250         case RG_XAH_CTRL_1:
 251         case RG_FTN_CTRL:
 252         case RG_PLL_CF:
 253         case RG_PLL_DCU:
 254         case RG_SHORT_ADDR_0:
 255         case RG_SHORT_ADDR_1:
 256         case RG_PAN_ID_0:
 257         case RG_PAN_ID_1:
 258         case RG_IEEE_ADDR_0:
 259         case RG_IEEE_ADDR_1:
 260         case RG_IEEE_ADDR_2:
 261         case RG_IEEE_ADDR_3:
 262         case RG_IEEE_ADDR_4:
 263         case RG_IEEE_ADDR_5:
 264         case RG_IEEE_ADDR_6:
 265         case RG_IEEE_ADDR_7:
 266         case RG_XAH_CTRL_0:
 267         case RG_CSMA_SEED_0:
 268         case RG_CSMA_SEED_1:
 269         case RG_CSMA_BE:
 270                 return true;
 271         default:
 272                 return false;
 273         }
 274 }
 275
 276 static bool
 277 at86rf230_reg_readable(struct device *dev, unsigned int reg)
 278 {
 279         bool rc;
 280
 281         /* all writeable are also readable */
 282         rc = at86rf230_reg_writeable(dev, reg);
 283         if (rc)
 284                 return rc;
 285
 286         /* readonly regs */
 287         switch (reg) {
 288         case RG_TRX_STATUS:
 289         case RG_PHY_RSSI:
 290         case RG_IRQ_STATUS:
 291         case RG_PART_NUM:
 292         case RG_VERSION_NUM:
 293         case RG_MAN_ID_1:
 294         case RG_MAN_ID_0:
 295                 return true;
 296         default:
 297                 return false;
 298         }
 299 }
 300
 301 static bool
 302 at86rf230_reg_volatile(struct device *dev, unsigned int reg)
 303 {
 304         /* can be changed during runtime */
 305         switch (reg) {
 306         case RG_TRX_STATUS:
 307         case RG_TRX_STATE:
 308         case RG_PHY_RSSI:
 309         case RG_PHY_ED_LEVEL:
 310         case RG_IRQ_STATUS:
 311         case RG_VREG_CTRL:
 312         case RG_PLL_CF:
 313         case RG_PLL_DCU:
 314                 return true;
 315         default:
 316                 return false;
 317         }
 318 }
 319
 320 static bool
 321 at86rf230_reg_precious(struct device *dev, unsigned int reg)
 322 {
 323         /* don't clear irq line on read */
 324         switch (reg) {
 325         case RG_IRQ_STATUS:
 326                 return true;
 327         default:
 328                 return false;
 329         }
 330 }
 331
 332 static const struct regmap_config at86rf230_regmap_spi_config = {
 333         .reg_bits = 8,
 334         .val_bits = 8,
 335         .write_flag_mask = CMD_REG | CMD_WRITE,
 336         .read_flag_mask = CMD_REG,
 337         .cache_type = REGCACHE_RBTREE,
 338         .max_register = AT86RF2XX_NUMREGS,
 339         .writeable_reg = at86rf230_reg_writeable,
 340         .readable_reg = at86rf230_reg_readable,
 341         .volatile_reg = at86rf230_reg_volatile,
 342         .precious_reg = at86rf230_reg_precious,
 343 };
 344
 345 static void
 346 at86rf230_async_error_recover(void *context)
 347 {
 348         struct at86rf230_state_change *ctx = context;
 349         struct at86rf230_local *lp = ctx->lp;
 350
 351         lp->is_tx = 0;
 352         at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON, NULL);
 353         ieee802154_wake_queue(lp->hw);
 354         if (ctx->free)
 355                 kfree(ctx);
 356 }
 357
 358 static inline void
 359 at86rf230_async_error(struct at86rf230_local *lp,
 360                       struct at86rf230_state_change *ctx, int rc)
 361 {
 362         dev_err(&lp->spi->dev, "spi_async error %d\n", rc);
 363
 364         at86rf230_async_state_change(lp, ctx, STATE_FORCE_TRX_OFF,
 365                                      at86rf230_async_error_recover);
 366 }
 367
 368 /* Generic function to get some register value in async mode */
 369 static void
 370 at86rf230_async_read_reg(struct at86rf230_local *lp, u8 reg,
 371                          struct at86rf230_state_change *ctx,
 372                          void (*complete)(void *context))
 373 {
 374         int rc;
 375
 376         u8 *tx_buf = ctx->buf;
 377
 378         tx_buf[0] = (reg & CMD_REG_MASK) | CMD_REG;
 379         ctx->msg.complete = complete;
 380         rc = spi_async(lp->spi, &ctx->msg);
 381         if (rc)
 382                 at86rf230_async_error(lp, ctx, rc);
 383 }
 384
 385 static void
 386 at86rf230_async_write_reg(struct at86rf230_local *lp, u8 reg, u8 val,
 387                           struct at86rf230_state_change *ctx,
 388                           void (*complete)(void *context))
 389 {
 390         int rc;
 391
 392         ctx->buf[0] = (reg & CMD_REG_MASK) | CMD_REG | CMD_WRITE;
 393         ctx->buf[1] = val;
 394         ctx->msg.complete = complete;
 395         rc = spi_async(lp->spi, &ctx->msg);
 396         if (rc)
 397                 at86rf230_async_error(lp, ctx, rc);
 398 }
 399
 400 static void
 401 at86rf230_async_state_assert(void *context)
 402 {
 403         struct at86rf230_state_change *ctx = context;
 404         struct at86rf230_local *lp = ctx->lp;
 405         const u8 *buf = ctx->buf;
 406         const u8 trx_state = buf[1] & TRX_STATE_MASK;
 407
 408         /* Assert state change */
 409         if (trx_state != ctx->to_state) {
 410                 /* Special handling if transceiver state is in
 411                  * STATE_BUSY_RX_AACK and a SHR was detected.
 412                  */
 413                 if  (trx_state == STATE_BUSY_RX_AACK) {
 414                         /* Undocumented race condition. If we send a state
 415                          * change to STATE_RX_AACK_ON the transceiver could
 416                          * change his state automatically to STATE_BUSY_RX_AACK
 417                          * if a SHR was detected. This is not an error, but we
 418                          * can't assert this.
 419                          */
 420                         if (ctx->to_state == STATE_RX_AACK_ON)
 421                                 goto done;
 422
 423                         /* If we change to STATE_TX_ON without forcing and
 424                          * transceiver state is STATE_BUSY_RX_AACK, we wait
 425                          * 'tFrame + tPAck' receiving time. In this time the
 426                          * PDU should be received. If the transceiver is still
 427                          * in STATE_BUSY_RX_AACK, we run a force state change
 428                          * to STATE_TX_ON. This is a timeout handling, if the
 429                          * transceiver stucks in STATE_BUSY_RX_AACK.
 430                          *
 431                          * Additional we do several retries to try to get into
 432                          * TX_ON state without forcing. If the retries are
 433                          * higher or equal than AT86RF2XX_MAX_TX_RETRIES we
 434                          * will do a force change.
 435                          */
 436                         if (ctx->to_state == STATE_TX_ON ||
 437                             ctx->to_state == STATE_TRX_OFF) {
 438                                 u8 state = ctx->to_state;
 439
 440                                 if (lp->tx_retry >= AT86RF2XX_MAX_TX_RETRIES)
 441                                         state = STATE_FORCE_TRX_OFF;
 442                                 lp->tx_retry++;
 443
 444                                 at86rf230_async_state_change(lp, ctx, state,
 445                                                              ctx->complete);
 446                                 return;
 447                         }
 448                 }
 449
 450                 dev_warn(&lp->spi->dev, "unexcept state change from 0x%02x to 0x%02x. Actual state: 0x%02x\n",
 451                          ctx->from_state, ctx->to_state, trx_state);
 452         }
 453
 454 done:
 455         if (ctx->complete)
 456                 ctx->complete(context);
 457 }
 458
 459 static enum hrtimer_restart at86rf230_async_state_timer(struct hrtimer *timer)
 460 {
 461         struct at86rf230_state_change *ctx =
 462                 container_of(timer, struct at86rf230_state_change, timer);
 463         struct at86rf230_local *lp = ctx->lp;
 464
 465         at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 466                                  at86rf230_async_state_assert);
 467
 468         return HRTIMER_NORESTART;
 469 }
 470
 471 /* Do state change timing delay. */
 472 static void
 473 at86rf230_async_state_delay(void *context)
 474 {
 475         struct at86rf230_state_change *ctx = context;
 476         struct at86rf230_local *lp = ctx->lp;
 477         struct at86rf2xx_chip_data *c = lp->data;
 478         bool force = false;
 479         ktime_t tim;
 480
 481         /* The force state changes are will show as normal states in the
 482          * state status subregister. We change the to_state to the
 483          * corresponding one and remember if it was a force change, this
 484          * differs if we do a state change from STATE_BUSY_RX_AACK.
 485          */
 486         switch (ctx->to_state) {
 487         case STATE_FORCE_TX_ON:
 488                 ctx->to_state = STATE_TX_ON;
 489                 force = true;
 490                 break;
 491         case STATE_FORCE_TRX_OFF:
 492                 ctx->to_state = STATE_TRX_OFF;
 493                 force = true;
 494                 break;
 495         default:
 496                 break;
 497         }
 498
 499         switch (ctx->from_state) {
 500         case STATE_TRX_OFF:
 501                 switch (ctx->to_state) {
 502                 case STATE_RX_AACK_ON:
 503                         tim = ktime_set(0, c->t_off_to_aack * NSEC_PER_USEC);
 504                         /* state change from TRX_OFF to RX_AACK_ON to do a
 505                          * calibration, we need to reset the timeout for the
 506                          * next one.
 507                          */
 508                         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
 509                         goto change;
 510                 case STATE_TX_ARET_ON:
 511                 case STATE_TX_ON:
 512                         tim = ktime_set(0, c->t_off_to_tx_on * NSEC_PER_USEC);
 513                         /* state change from TRX_OFF to TX_ON or ARET_ON to do
 514                          * a calibration, we need to reset the timeout for the
 515                          * next one.
 516                          */
 517                         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
 518                         goto change;
 519                 default:
 520                         break;
 521                 }
 522                 break;
 523         case STATE_BUSY_RX_AACK:
 524                 switch (ctx->to_state) {
 525                 case STATE_TRX_OFF:
 526                 case STATE_TX_ON:
 527                         /* Wait for worst case receiving time if we
 528                          * didn't make a force change from BUSY_RX_AACK
 529                          * to TX_ON or TRX_OFF.
 530                          */
 531                         if (!force) {
 532                                 tim = ktime_set(0, (c->t_frame + c->t_p_ack) *
 533                                                    NSEC_PER_USEC);
 534                                 goto change;
 535                         }
 536                         break;
 537                 default:
 538                         break;
 539                 }
 540                 break;
 541         /* Default value, means RESET state */
 542         case STATE_P_ON:
 543                 switch (ctx->to_state) {
 544                 case STATE_TRX_OFF:
 545                         tim = ktime_set(0, c->t_reset_to_off * NSEC_PER_USEC);
 546                         goto change;
 547                 default:
 548                         break;
 549                 }
 550                 break;
 551         default:
 552                 break;
 553         }
 554
 555         /* Default delay is 1us in the most cases */
 556         udelay(1);
 557         at86rf230_async_state_timer(&ctx->timer);
 558         return;
 559
 560 change:
 561         hrtimer_start(&ctx->timer, tim, HRTIMER_MODE_REL);
 562 }
 563
 564 static void
 565 at86rf230_async_state_change_start(void *context)
 566 {
 567         struct at86rf230_state_change *ctx = context;
 568         struct at86rf230_local *lp = ctx->lp;
 569         u8 *buf = ctx->buf;
 570         const u8 trx_state = buf[1] & TRX_STATE_MASK;
 571
 572         /* Check for "possible" STATE_TRANSITION_IN_PROGRESS */
 573         if (trx_state == STATE_TRANSITION_IN_PROGRESS) {
 574                 udelay(1);
 575                 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 576                                          at86rf230_async_state_change_start);
 577                 return;
 578         }
 579
 580         /* Check if we already are in the state which we change in */
 581         if (trx_state == ctx->to_state) {
 582                 if (ctx->complete)
 583                         ctx->complete(context);
 584                 return;
 585         }
 586
 587         /* Set current state to the context of state change */
 588         ctx->from_state = trx_state;
 589
 590         /* Going into the next step for a state change which do a timing
 591          * relevant delay.
 592          */
 593         at86rf230_async_write_reg(lp, RG_TRX_STATE, ctx->to_state, ctx,
 594                                   at86rf230_async_state_delay);
 595 }
 596
 597 static void
 598 at86rf230_async_state_change(struct at86rf230_local *lp,
 599                              struct at86rf230_state_change *ctx,
 600                              const u8 state, void (*complete)(void *context))
 601 {
 602         /* Initialization for the state change context */
 603         ctx->to_state = state;
 604         ctx->complete = complete;
 605         at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 606                                  at86rf230_async_state_change_start);
 607 }
 608
 609 static void
 610 at86rf230_sync_state_change_complete(void *context)
 611 {
 612         struct at86rf230_state_change *ctx = context;
 613         struct at86rf230_local *lp = ctx->lp;
 614
 615         complete(&lp->state_complete);
 616 }
 617
 618 /* This function do a sync framework above the async state change.
 619  * Some callbacks of the IEEE 802.15.4 driver interface need to be
 620  * handled synchronously.
 621  */
 622 static int
 623 at86rf230_sync_state_change(struct at86rf230_local *lp, unsigned int state)
 624 {
 625         unsigned long rc;
 626
 627         at86rf230_async_state_change(lp, &lp->state, state,
 628                                      at86rf230_sync_state_change_complete);
 629
 630         rc = wait_for_completion_timeout(&lp->state_complete,
 631                                          msecs_to_jiffies(100));
 632         if (!rc) {
 633                 at86rf230_async_error(lp, &lp->state, -ETIMEDOUT);
 634                 return -ETIMEDOUT;
 635         }
 636
 637         return 0;
 638 }
 639
 640 static void
 641 at86rf230_tx_complete(void *context)
 642 {
 643         struct at86rf230_state_change *ctx = context;
 644         struct at86rf230_local *lp = ctx->lp;
 645
 646         ieee802154_xmit_complete(lp->hw, lp->tx_skb, false);
 647         kfree(ctx);
 648 }
 649
 650 static void
 651 at86rf230_tx_on(void *context)
 652 {
 653         struct at86rf230_state_change *ctx = context;
 654         struct at86rf230_local *lp = ctx->lp;
 655
 656         at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON,
 657                                      at86rf230_tx_complete);
 658 }
 659
 660 static void
 661 at86rf230_tx_trac_check(void *context)
 662 {
 663         struct at86rf230_state_change *ctx = context;
 664         struct at86rf230_local *lp = ctx->lp;
 665
 666         if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS)) {
 667                 u8 trac = TRAC_MASK(ctx->buf[1]);
 668
 669                 switch (trac) {
 670                 case TRAC_SUCCESS:
 671                         lp->trac.success++;
 672                         break;
 673                 case TRAC_SUCCESS_DATA_PENDING:
 674                         lp->trac.success_data_pending++;
 675                         break;
 676                 case TRAC_CHANNEL_ACCESS_FAILURE:
 677                         lp->trac.channel_access_failure++;
 678                         break;
 679                 case TRAC_NO_ACK:
 680                         lp->trac.no_ack++;
 681                         break;
 682                 case TRAC_INVALID:
 683                         lp->trac.invalid++;
 684                         break;
 685                 default:
 686                         WARN_ONCE(1, "received tx trac status %d\n", trac);
 687                         break;
 688                 }
 689         }
 690
 691         at86rf230_async_state_change(lp, ctx, STATE_TX_ON, at86rf230_tx_on);
 692 }
 693
 694 static void
 695 at86rf230_rx_read_frame_complete(void *context)
 696 {
 697         struct at86rf230_state_change *ctx = context;
 698         struct at86rf230_local *lp = ctx->lp;
 699         const u8 *buf = ctx->buf;
 700         struct sk_buff *skb;
 701         u8 len, lqi;
 702
 703         len = buf[1];
 704         if (!ieee802154_is_valid_psdu_len(len)) {
 705                 dev_vdbg(&lp->spi->dev, "corrupted frame received\n");
 706                 len = IEEE802154_MTU;
 707         }
 708         lqi = buf[2 + len];
 709
 710         skb = dev_alloc_skb(IEEE802154_MTU);
 711         if (!skb) {
 712                 dev_vdbg(&lp->spi->dev, "failed to allocate sk_buff\n");
 713                 kfree(ctx);
 714                 return;
 715         }
 716
 717         memcpy(skb_put(skb, len), buf + 2, len);
 718         ieee802154_rx_irqsafe(lp->hw, skb, lqi);
 719         kfree(ctx);
 720 }
 721
 722 static void
 723 at86rf230_rx_trac_check(void *context)
 724 {
 725         struct at86rf230_state_change *ctx = context;
 726         struct at86rf230_local *lp = ctx->lp;
 727         u8 *buf = ctx->buf;
 728         int rc;
 729
 730         if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS)) {
 731                 u8 trac = TRAC_MASK(buf[1]);
 732
 733                 switch (trac) {
 734                 case TRAC_SUCCESS:
 735                         lp->trac.success++;
 736                         break;
 737                 case TRAC_SUCCESS_WAIT_FOR_ACK:
 738                         lp->trac.success_wait_for_ack++;
 739                         break;
 740                 case TRAC_INVALID:
 741                         lp->trac.invalid++;
 742                         break;
 743                 default:
 744                         WARN_ONCE(1, "received rx trac status %d\n", trac);
 745                         break;
 746                 }
 747         }
 748
 749         buf[0] = CMD_FB;
 750         ctx->trx.len = AT86RF2XX_MAX_BUF;
 751         ctx->msg.complete = at86rf230_rx_read_frame_complete;
 752         rc = spi_async(lp->spi, &ctx->msg);
 753         if (rc) {
 754                 ctx->trx.len = 2;
 755                 at86rf230_async_error(lp, ctx, rc);
 756         }
 757 }
 758
 759 static void
 760 at86rf230_irq_trx_end(void *context)
 761 {
 762         struct at86rf230_state_change *ctx = context;
 763         struct at86rf230_local *lp = ctx->lp;
 764
 765         if (lp->is_tx) {
 766                 lp->is_tx = 0;
 767                 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx,
 768                                          at86rf230_tx_trac_check);
 769         } else {
 770                 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx,
 771                                          at86rf230_rx_trac_check);
 772         }
 773 }
 774
 775 static void
 776 at86rf230_irq_status(void *context)
 777 {
 778         struct at86rf230_state_change *ctx = context;
 779         struct at86rf230_local *lp = ctx->lp;
 780         const u8 *buf = ctx->buf;
 781         u8 irq = buf[1];
 782
 783         enable_irq(lp->spi->irq);
 784
 785         if (irq & IRQ_TRX_END) {
 786                 at86rf230_irq_trx_end(ctx);
 787         } else {
 788                 dev_err(&lp->spi->dev, "not supported irq %02x received\n",
 789                         irq);
 790                 kfree(ctx);
 791         }
 792 }
 793
 794 static void
 795 at86rf230_setup_spi_messages(struct at86rf230_local *lp,
 796                              struct at86rf230_state_change *state)
 797 {
 798         state->lp = lp;
 799         state->irq = lp->spi->irq;
 800         spi_message_init(&state->msg);
 801         state->msg.context = state;
 802         state->trx.len = 2;
 803         state->trx.tx_buf = state->buf;
 804         state->trx.rx_buf = state->buf;
 805         spi_message_add_tail(&state->trx, &state->msg);
 806         hrtimer_init(&state->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 807         state->timer.function = at86rf230_async_state_timer;
 808 }
 809
 810 static irqreturn_t at86rf230_isr(int irq, void *data)
 811 {
 812         struct at86rf230_local *lp = data;
 813         struct at86rf230_state_change *ctx;
 814         int rc;
 815
 816         disable_irq_nosync(irq);
 817
 818         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 819         if (!ctx) {
 820                 enable_irq(irq);
 821                 return IRQ_NONE;
 822         }
 823
 824         at86rf230_setup_spi_messages(lp, ctx);
 825         /* tell on error handling to free ctx */
 826         ctx->free = true;
 827
 828         ctx->buf[0] = (RG_IRQ_STATUS & CMD_REG_MASK) | CMD_REG;
 829         ctx->msg.complete = at86rf230_irq_status;
 830         rc = spi_async(lp->spi, &ctx->msg);
 831         if (rc) {
 832                 at86rf230_async_error(lp, ctx, rc);
 833                 enable_irq(irq);
 834                 return IRQ_NONE;
 835         }
 836
 837         return IRQ_HANDLED;
 838 }
 839
 840 static void
 841 at86rf230_write_frame_complete(void *context)
 842 {
 843         struct at86rf230_state_change *ctx = context;
 844         struct at86rf230_local *lp = ctx->lp;
 845
 846         ctx->trx.len = 2;
 847
 848         if (gpio_is_valid(lp->slp_tr))
 849                 at86rf230_slp_tr_rising_edge(lp);
 850         else
 851                 at86rf230_async_write_reg(lp, RG_TRX_STATE, STATE_BUSY_TX, ctx,
 852                                           NULL);
 853 }
 854
 855 static void
 856 at86rf230_write_frame(void *context)
 857 {
 858         struct at86rf230_state_change *ctx = context;
 859         struct at86rf230_local *lp = ctx->lp;
 860         struct sk_buff *skb = lp->tx_skb;
 861         u8 *buf = ctx->buf;
 862         int rc;
 863
 864         lp->is_tx = 1;
 865
 866         buf[0] = CMD_FB | CMD_WRITE;
 867         buf[1] = skb->len + 2;
 868         memcpy(buf + 2, skb->data, skb->len);
 869         ctx->trx.len = skb->len + 2;
 870         ctx->msg.complete = at86rf230_write_frame_complete;
 871         rc = spi_async(lp->spi, &ctx->msg);
 872         if (rc) {
 873                 ctx->trx.len = 2;
 874                 at86rf230_async_error(lp, ctx, rc);
 875         }
 876 }
 877
 878 static void
 879 at86rf230_xmit_tx_on(void *context)
 880 {
 881         struct at86rf230_state_change *ctx = context;
 882         struct at86rf230_local *lp = ctx->lp;
 883
 884         at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
 885                                      at86rf230_write_frame);
 886 }
 887
 888 static void
 889 at86rf230_xmit_start(void *context)
 890 {
 891         struct at86rf230_state_change *ctx = context;
 892         struct at86rf230_local *lp = ctx->lp;
 893
 894         /* check if we change from off state */
 895         if (lp->is_tx_from_off) {
 896                 lp->is_tx_from_off = false;
 897                 at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
 898                                              at86rf230_write_frame);
 899         } else {
 900                 at86rf230_async_state_change(lp, ctx, STATE_TX_ON,
 901                                              at86rf230_xmit_tx_on);
 902         }
 903 }
 904
 905 static int
 906 at86rf230_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
 907 {
 908         struct at86rf230_local *lp = hw->priv;
 909         struct at86rf230_state_change *ctx = &lp->tx;
 910
 911         lp->tx_skb = skb;
 912         lp->tx_retry = 0;
 913
 914         /* After 5 minutes in PLL and the same frequency we run again the
 915          * calibration loops which is recommended by at86rf2xx datasheets.
 916          *
 917          * The calibration is initiate by a state change from TRX_OFF
 918          * to TX_ON, the lp->cal_timeout should be reinit by state_delay
 919          * function then to start in the next 5 minutes.
 920          */
 921         if (time_is_before_jiffies(lp->cal_timeout)) {
 922                 lp->is_tx_from_off = true;
 923                 at86rf230_async_state_change(lp, ctx, STATE_TRX_OFF,
 924                                              at86rf230_xmit_start);
 925         } else {
 926                 at86rf230_xmit_start(ctx);
 927         }
 928
 929         return 0;
 930 }
 931
 932 static int
 933 at86rf230_ed(struct ieee802154_hw *hw, u8 *level)
 934 {
 935         BUG_ON(!level);
 936         *level = 0xbe;
 937         return 0;
 938 }
 939
 940 static int
 941 at86rf230_start(struct ieee802154_hw *hw)
 942 {
 943         struct at86rf230_local *lp = hw->priv;
 944
 945         /* reset trac stats on start */
 946         if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS))
 947                 memset(&lp->trac, 0, sizeof(struct at86rf230_trac));
 948
 949         at86rf230_awake(lp);
 950         enable_irq(lp->spi->irq);
 951
 952         return at86rf230_sync_state_change(lp, STATE_RX_AACK_ON);
 953 }
 954
 955 static void
 956 at86rf230_stop(struct ieee802154_hw *hw)
 957 {
 958         struct at86rf230_local *lp = hw->priv;
 959         u8 csma_seed[2];
 960
 961         at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
 962
 963         disable_irq(lp->spi->irq);
 964
 965         /* It's recommended to set random new csma_seeds before sleep state.
 966          * Makes only sense in the stop callback, not doing this inside of
 967          * at86rf230_sleep, this is also used when we don't transmit afterwards
 968          * when calling start callback again.
 969          */
 970         get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
 971         at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
 972         at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
 973
 974         at86rf230_sleep(lp);
 975 }
 976
 977 static int
 978 at86rf23x_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
 979 {
 980         return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
 981 }
 982
 983 #define AT86RF2XX_MAX_ED_LEVELS 0xF
 984 static const s32 at86rf23x_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = {
 985         -9100, -8900, -8700, -8500, -8300, -8100, -7900, -7700, -7500, -7300,
 986         -7100, -6900, -6700, -6500, -6300, -6100,
 987 };
 988
 989 static const s32 at86rf212_ed_levels_100[AT86RF2XX_MAX_ED_LEVELS + 1] = {
 990         -10000, -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200,
 991         -8000, -7800, -7600, -7400, -7200, -7000,
 992 };
 993
 994 static const s32 at86rf212_ed_levels_98[AT86RF2XX_MAX_ED_LEVELS + 1] = {
 995         -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000,
 996         -7800, -7600, -7400, -7200, -7000, -6800,
 997 };
 998
 999 static inline int
1000 at86rf212_update_cca_ed_level(struct at86rf230_local *lp, int rssi_base_val)
1001 {
1002         unsigned int cca_ed_thres;
1003         int rc;
1004
1005         rc = at86rf230_read_subreg(lp, SR_CCA_ED_THRES, &cca_ed_thres);
1006         if (rc < 0)
1007                 return rc;
1008
1009         switch (rssi_base_val) {
1010         case -98:
1011                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_98;
1012                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_98);
1013                 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_98[cca_ed_thres];
1014                 break;
1015         case -100:
1016                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
1017                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
1018                 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_100[cca_ed_thres];
1019                 break;
1020         default:
1021                 WARN_ON(1);
1022         }
1023
1024         return 0;
1025 }
1026
1027 static int
1028 at86rf212_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
1029 {
1030         int rc;
1031
1032         if (channel == 0)
1033                 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 0);
1034         else
1035                 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 1);
1036         if (rc < 0)
1037                 return rc;
1038
1039         if (page == 0) {
1040                 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 0);
1041                 lp->data->rssi_base_val = -100;
1042         } else {
1043                 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 1);
1044                 lp->data->rssi_base_val = -98;
1045         }
1046         if (rc < 0)
1047                 return rc;
1048
1049         rc = at86rf212_update_cca_ed_level(lp, lp->data->rssi_base_val);
1050         if (rc < 0)
1051                 return rc;
1052
1053         /* This sets the symbol_duration according frequency on the 212.
1054          * TODO move this handling while set channel and page in cfg802154.
1055          * We can do that, this timings are according 802.15.4 standard.
1056          * If we do that in cfg802154, this is a more generic calculation.
1057          *
1058          * This should also protected from ifs_timer. Means cancel timer and
1059          * init with a new value. For now, this is okay.
1060          */
1061         if (channel == 0) {
1062                 if (page == 0) {
1063                         /* SUB:0 and BPSK:0 -> BPSK-20 */
1064                         lp->hw->phy->symbol_duration = 50;
1065                 } else {
1066                         /* SUB:1 and BPSK:0 -> BPSK-40 */
1067                         lp->hw->phy->symbol_duration = 25;
1068                 }
1069         } else {
1070                 if (page == 0)
1071                         /* SUB:0 and BPSK:1 -> OQPSK-100/200/400 */
1072                         lp->hw->phy->symbol_duration = 40;
1073                 else
1074                         /* SUB:1 and BPSK:1 -> OQPSK-250/500/1000 */
1075                         lp->hw->phy->symbol_duration = 16;
1076         }
1077
1078         lp->hw->phy->lifs_period = IEEE802154_LIFS_PERIOD *
1079                                    lp->hw->phy->symbol_duration;
1080         lp->hw->phy->sifs_period = IEEE802154_SIFS_PERIOD *
1081                                    lp->hw->phy->symbol_duration;
1082
1083         return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
1084 }
1085
1086 static int
1087 at86rf230_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
1088 {
1089         struct at86rf230_local *lp = hw->priv;
1090         int rc;
1091
1092         rc = lp->data->set_channel(lp, page, channel);
1093         /* Wait for PLL */
1094         usleep_range(lp->data->t_channel_switch,
1095                      lp->data->t_channel_switch + 10);
1096
1097         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
1098         return rc;
1099 }
1100
1101 static int
1102 at86rf230_set_hw_addr_filt(struct ieee802154_hw *hw,
1103                            struct ieee802154_hw_addr_filt *filt,
1104                            unsigned long changed)
1105 {
1106         struct at86rf230_local *lp = hw->priv;
1107
1108         if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
1109                 u16 addr = le16_to_cpu(filt->short_addr);
1110
1111                 dev_vdbg(&lp->spi->dev,
1112                          "at86rf230_set_hw_addr_filt called for saddr\n");
1113                 __at86rf230_write(lp, RG_SHORT_ADDR_0, addr);
1114                 __at86rf230_write(lp, RG_SHORT_ADDR_1, addr >> 8);
1115         }
1116
1117         if (changed & IEEE802154_AFILT_PANID_CHANGED) {
1118                 u16 pan = le16_to_cpu(filt->pan_id);
1119
1120                 dev_vdbg(&lp->spi->dev,
1121                          "at86rf230_set_hw_addr_filt called for pan id\n");
1122                 __at86rf230_write(lp, RG_PAN_ID_0, pan);
1123                 __at86rf230_write(lp, RG_PAN_ID_1, pan >> 8);
1124         }
1125
1126         if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
1127                 u8 i, addr[8];
1128
1129                 memcpy(addr, &filt->ieee_addr, 8);
1130                 dev_vdbg(&lp->spi->dev,
1131                          "at86rf230_set_hw_addr_filt called for IEEE addr\n");
1132                 for (i = 0; i < 8; i++)
1133                         __at86rf230_write(lp, RG_IEEE_ADDR_0 + i, addr[i]);
1134         }
1135
1136         if (changed & IEEE802154_AFILT_PANC_CHANGED) {
1137                 dev_vdbg(&lp->spi->dev,
1138                          "at86rf230_set_hw_addr_filt called for panc change\n");
1139                 if (filt->pan_coord)
1140                         at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 1);
1141                 else
1142                         at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 0);
1143         }
1144
1145         return 0;
1146 }
1147
1148 #define AT86RF23X_MAX_TX_POWERS 0xF
1149 static const s32 at86rf233_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1150         400, 370, 340, 300, 250, 200, 100, 0, -100, -200, -300, -400, -600,
1151         -800, -1200, -1700,
1152 };
1153
1154 static const s32 at86rf231_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1155         300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700,
1156         -900, -1200, -1700,
1157 };
1158
1159 #define AT86RF212_MAX_TX_POWERS 0x1F
1160 static const s32 at86rf212_powers[AT86RF212_MAX_TX_POWERS + 1] = {
1161         500, 400, 300, 200, 100, 0, -100, -200, -300, -400, -500, -600, -700,
1162         -800, -900, -1000, -1100, -1200, -1300, -1400, -1500, -1600, -1700,
1163         -1800, -1900, -2000, -2100, -2200, -2300, -2400, -2500, -2600,
1164 };
1165
1166 static int
1167 at86rf23x_set_txpower(struct at86rf230_local *lp, s32 mbm)
1168 {
1169         u32 i;
1170
1171         for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1172                 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1173                         return at86rf230_write_subreg(lp, SR_TX_PWR_23X, i);
1174         }
1175
1176         return -EINVAL;
1177 }
1178
1179 static int
1180 at86rf212_set_txpower(struct at86rf230_local *lp, s32 mbm)
1181 {
1182         u32 i;
1183
1184         for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1185                 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1186                         return at86rf230_write_subreg(lp, SR_TX_PWR_212, i);
1187         }
1188
1189         return -EINVAL;
1190 }
1191
1192 static int
1193 at86rf230_set_txpower(struct ieee802154_hw *hw, s32 mbm)
1194 {
1195         struct at86rf230_local *lp = hw->priv;
1196
1197         return lp->data->set_txpower(lp, mbm);
1198 }
1199
1200 static int
1201 at86rf230_set_lbt(struct ieee802154_hw *hw, bool on)
1202 {
1203         struct at86rf230_local *lp = hw->priv;
1204
1205         return at86rf230_write_subreg(lp, SR_CSMA_LBT_MODE, on);
1206 }
1207
1208 static int
1209 at86rf230_set_cca_mode(struct ieee802154_hw *hw,
1210                        const struct wpan_phy_cca *cca)
1211 {
1212         struct at86rf230_local *lp = hw->priv;
1213         u8 val;
1214
1215         /* mapping 802.15.4 to driver spec */
1216         switch (cca->mode) {
1217         case NL802154_CCA_ENERGY:
1218                 val = 1;
1219                 break;
1220         case NL802154_CCA_CARRIER:
1221                 val = 2;
1222                 break;
1223         case NL802154_CCA_ENERGY_CARRIER:
1224                 switch (cca->opt) {
1225                 case NL802154_CCA_OPT_ENERGY_CARRIER_AND:
1226                         val = 3;
1227                         break;
1228                 case NL802154_CCA_OPT_ENERGY_CARRIER_OR:
1229                         val = 0;
1230                         break;
1231                 default:
1232                         return -EINVAL;
1233                 }
1234                 break;
1235         default:
1236                 return -EINVAL;
1237         }
1238
1239         return at86rf230_write_subreg(lp, SR_CCA_MODE, val);
1240 }
1241
1242
1243 static int
1244 at86rf230_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
1245 {
1246         struct at86rf230_local *lp = hw->priv;
1247         u32 i;
1248
1249         for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) {
1250                 if (hw->phy->supported.cca_ed_levels[i] == mbm)
1251                         return at86rf230_write_subreg(lp, SR_CCA_ED_THRES, i);
1252         }
1253
1254         return -EINVAL;
1255 }
1256
1257 static int
1258 at86rf230_set_csma_params(struct ieee802154_hw *hw, u8 min_be, u8 max_be,
1259                           u8 retries)
1260 {
1261         struct at86rf230_local *lp = hw->priv;
1262         int rc;
1263
1264         rc = at86rf230_write_subreg(lp, SR_MIN_BE, min_be);
1265         if (rc)
1266                 return rc;
1267
1268         rc = at86rf230_write_subreg(lp, SR_MAX_BE, max_be);
1269         if (rc)
1270                 return rc;
1271
1272         return at86rf230_write_subreg(lp, SR_MAX_CSMA_RETRIES, retries);
1273 }
1274
1275 static int
1276 at86rf230_set_frame_retries(struct ieee802154_hw *hw, s8 retries)
1277 {
1278         struct at86rf230_local *lp = hw->priv;
1279
1280         return at86rf230_write_subreg(lp, SR_MAX_FRAME_RETRIES, retries);
1281 }
1282
1283 static int
1284 at86rf230_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
1285 {
1286         struct at86rf230_local *lp = hw->priv;
1287         int rc;
1288
1289         if (on) {
1290                 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 1);
1291                 if (rc < 0)
1292                         return rc;
1293
1294                 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 1);
1295                 if (rc < 0)
1296                         return rc;
1297         } else {
1298                 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 0);
1299                 if (rc < 0)
1300                         return rc;
1301
1302                 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 0);
1303                 if (rc < 0)
1304                         return rc;
1305         }
1306
1307         return 0;
1308 }
1309
1310 static const struct ieee802154_ops at86rf230_ops = {
1311         .owner = THIS_MODULE,
1312         .xmit_async = at86rf230_xmit,
1313         .ed = at86rf230_ed,
1314         .set_channel = at86rf230_channel,
1315         .start = at86rf230_start,
1316         .stop = at86rf230_stop,
1317         .set_hw_addr_filt = at86rf230_set_hw_addr_filt,
1318         .set_txpower = at86rf230_set_txpower,
1319         .set_lbt = at86rf230_set_lbt,
1320         .set_cca_mode = at86rf230_set_cca_mode,
1321         .set_cca_ed_level = at86rf230_set_cca_ed_level,
1322         .set_csma_params = at86rf230_set_csma_params,
1323         .set_frame_retries = at86rf230_set_frame_retries,
1324         .set_promiscuous_mode = at86rf230_set_promiscuous_mode,
1325 };
1326
1327 static struct at86rf2xx_chip_data at86rf233_data = {
1328         .t_sleep_cycle = 330,
1329         .t_channel_switch = 11,
1330         .t_reset_to_off = 26,
1331         .t_off_to_aack = 80,
1332         .t_off_to_tx_on = 80,
1333         .t_off_to_sleep = 35,
1334         .t_sleep_to_off = 210,
1335         .t_frame = 4096,
1336         .t_p_ack = 545,
1337         .rssi_base_val = -91,
1338         .set_channel = at86rf23x_set_channel,
1339         .set_txpower = at86rf23x_set_txpower,
1340 };
1341
1342 static struct at86rf2xx_chip_data at86rf231_data = {
1343         .t_sleep_cycle = 330,
1344         .t_channel_switch = 24,
1345         .t_reset_to_off = 37,
1346         .t_off_to_aack = 110,
1347         .t_off_to_tx_on = 110,
1348         .t_off_to_sleep = 35,
1349         .t_sleep_to_off = 380,
1350         .t_frame = 4096,
1351         .t_p_ack = 545,
1352         .rssi_base_val = -91,
1353         .set_channel = at86rf23x_set_channel,
1354         .set_txpower = at86rf23x_set_txpower,
1355 };
1356
1357 static struct at86rf2xx_chip_data at86rf212_data = {
1358         .t_sleep_cycle = 330,
1359         .t_channel_switch = 11,
1360         .t_reset_to_off = 26,
1361         .t_off_to_aack = 200,
1362         .t_off_to_tx_on = 200,
1363         .t_off_to_sleep = 35,
1364         .t_sleep_to_off = 380,
1365         .t_frame = 4096,
1366         .t_p_ack = 545,
1367         .rssi_base_val = -100,
1368         .set_channel = at86rf212_set_channel,
1369         .set_txpower = at86rf212_set_txpower,
1370 };
1371
1372 static int at86rf230_hw_init(struct at86rf230_local *lp, u8 xtal_trim)
1373 {
1374         int rc, irq_type, irq_pol = IRQ_ACTIVE_HIGH;
1375         unsigned int dvdd;
1376         u8 csma_seed[2];
1377
1378         rc = at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
1379         if (rc)
1380                 return rc;
1381
1382         irq_type = irq_get_trigger_type(lp->spi->irq);
1383         if (irq_type == IRQ_TYPE_EDGE_FALLING ||
1384             irq_type == IRQ_TYPE_LEVEL_LOW)
1385                 irq_pol = IRQ_ACTIVE_LOW;
1386
1387         rc = at86rf230_write_subreg(lp, SR_IRQ_POLARITY, irq_pol);
1388         if (rc)
1389                 return rc;
1390
1391         rc = at86rf230_write_subreg(lp, SR_RX_SAFE_MODE, 1);
1392         if (rc)
1393                 return rc;
1394
1395         rc = at86rf230_write_subreg(lp, SR_IRQ_MASK, IRQ_TRX_END);
1396         if (rc)
1397                 return rc;
1398
1399         /* reset values differs in at86rf231 and at86rf233 */
1400         rc = at86rf230_write_subreg(lp, SR_IRQ_MASK_MODE, 0);
1401         if (rc)
1402                 return rc;
1403
1404         get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
1405         rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
1406         if (rc)
1407                 return rc;
1408         rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
1409         if (rc)
1410                 return rc;
1411
1412         /* CLKM changes are applied immediately */
1413         rc = at86rf230_write_subreg(lp, SR_CLKM_SHA_SEL, 0x00);
1414         if (rc)
1415                 return rc;
1416
1417         /* Turn CLKM Off */
1418         rc = at86rf230_write_subreg(lp, SR_CLKM_CTRL, 0x00);
1419         if (rc)
1420                 return rc;
1421         /* Wait the next SLEEP cycle */
1422         usleep_range(lp->data->t_sleep_cycle,
1423                      lp->data->t_sleep_cycle + 100);
1424
1425         /* xtal_trim value is calculated by:
1426          * CL = 0.5 * (CX + CTRIM + CPAR)
1427          *
1428          * whereas:
1429          * CL = capacitor of used crystal
1430          * CX = connected capacitors at xtal pins
1431          * CPAR = in all at86rf2xx datasheets this is a constant value 3 pF,
1432          *        but this is different on each board setup. You need to fine
1433          *        tuning this value via CTRIM.
1434          * CTRIM = variable capacitor setting. Resolution is 0.3 pF range is
1435          *         0 pF upto 4.5 pF.
1436          *
1437          * Examples:
1438          * atben transceiver:
1439          *
1440          * CL = 8 pF
1441          * CX = 12 pF
1442          * CPAR = 3 pF (We assume the magic constant from datasheet)
1443          * CTRIM = 0.9 pF
1444          *
1445          * (12+0.9+3)/2 = 7.95 which is nearly at 8 pF
1446          *
1447          * xtal_trim = 0x3
1448          *
1449          * openlabs transceiver:
1450          *
1451          * CL = 16 pF
1452          * CX = 22 pF
1453          * CPAR = 3 pF (We assume the magic constant from datasheet)
1454          * CTRIM = 4.5 pF
1455          *
1456          * (22+4.5+3)/2 = 14.75 which is the nearest value to 16 pF
1457          *
1458          * xtal_trim = 0xf
1459          */
1460         rc = at86rf230_write_subreg(lp, SR_XTAL_TRIM, xtal_trim);
1461         if (rc)
1462                 return rc;
1463
1464         rc = at86rf230_read_subreg(lp, SR_DVDD_OK, &dvdd);
1465         if (rc)
1466                 return rc;
1467         if (!dvdd) {
1468                 dev_err(&lp->spi->dev, "DVDD error\n");
1469                 return -EINVAL;
1470         }
1471
1472         /* Force setting slotted operation bit to 0. Sometimes the atben
1473          * sets this bit and I don't know why. We set this always force
1474          * to zero while probing.
1475          */
1476         return at86rf230_write_subreg(lp, SR_SLOTTED_OPERATION, 0);
1477 }
1478
1479 static int
1480 at86rf230_get_pdata(struct spi_device *spi, int *rstn, int *slp_tr,
1481                     u8 *xtal_trim)
1482 {
1483         struct at86rf230_platform_data *pdata = spi->dev.platform_data;
1484         int ret;
1485
1486         if (!IS_ENABLED(CONFIG_OF) || !spi->dev.of_node) {
1487                 if (!pdata)
1488                         return -ENOENT;
1489
1490                 *rstn = pdata->rstn;
1491                 *slp_tr = pdata->slp_tr;
1492                 *xtal_trim = pdata->xtal_trim;
1493                 return 0;
1494         }
1495
1496         *rstn = of_get_named_gpio(spi->dev.of_node, "reset-gpio", 0);
1497         *slp_tr = of_get_named_gpio(spi->dev.of_node, "sleep-gpio", 0);
1498         ret = of_property_read_u8(spi->dev.of_node, "xtal-trim", xtal_trim);
1499         if (ret < 0 && ret != -EINVAL)
1500                 return ret;
1501
1502         return 0;
1503 }
1504
1505 static int
1506 at86rf230_detect_device(struct at86rf230_local *lp)
1507 {
1508         unsigned int part, version, val;
1509         u16 man_id = 0;
1510         const char *chip;
1511         int rc;
1512
1513         rc = __at86rf230_read(lp, RG_MAN_ID_0, &val);
1514         if (rc)
1515                 return rc;
1516         man_id |= val;
1517
1518         rc = __at86rf230_read(lp, RG_MAN_ID_1, &val);
1519         if (rc)
1520                 return rc;
1521         man_id |= (val << 8);
1522
1523         rc = __at86rf230_read(lp, RG_PART_NUM, &part);
1524         if (rc)
1525                 return rc;
1526
1527         rc = __at86rf230_read(lp, RG_VERSION_NUM, &version);
1528         if (rc)
1529                 return rc;
1530
1531         if (man_id != 0x001f) {
1532                 dev_err(&lp->spi->dev, "Non-Atmel dev found (MAN_ID %02x %02x)\n",
1533                         man_id >> 8, man_id & 0xFF);
1534                 return -EINVAL;
1535         }
1536
1537         lp->hw->flags = IEEE802154_HW_TX_OMIT_CKSUM |
1538                         IEEE802154_HW_CSMA_PARAMS |
1539                         IEEE802154_HW_FRAME_RETRIES | IEEE802154_HW_AFILT |
1540                         IEEE802154_HW_PROMISCUOUS;
1541
1542         lp->hw->phy->flags = WPAN_PHY_FLAG_TXPOWER |
1543                              WPAN_PHY_FLAG_CCA_ED_LEVEL |
1544                              WPAN_PHY_FLAG_CCA_MODE;
1545
1546         lp->hw->phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY) |
1547                 BIT(NL802154_CCA_CARRIER) | BIT(NL802154_CCA_ENERGY_CARRIER);
1548         lp->hw->phy->supported.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND) |
1549                 BIT(NL802154_CCA_OPT_ENERGY_CARRIER_OR);
1550
1551         lp->hw->phy->supported.cca_ed_levels = at86rf23x_ed_levels;
1552         lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf23x_ed_levels);
1553
1554         lp->hw->phy->cca.mode = NL802154_CCA_ENERGY;
1555
1556         switch (part) {
1557         case 2:
1558                 chip = "at86rf230";
1559                 rc = -ENOTSUPP;
1560                 goto not_supp;
1561         case 3:
1562                 chip = "at86rf231";
1563                 lp->data = &at86rf231_data;
1564                 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1565                 lp->hw->phy->current_channel = 11;
1566                 lp->hw->phy->symbol_duration = 16;
1567                 lp->hw->phy->supported.tx_powers = at86rf231_powers;
1568                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf231_powers);
1569                 break;
1570         case 7:
1571                 chip = "at86rf212";
1572                 lp->data = &at86rf212_data;
1573                 lp->hw->flags |= IEEE802154_HW_LBT;
1574                 lp->hw->phy->supported.channels[0] = 0x00007FF;
1575                 lp->hw->phy->supported.channels[2] = 0x00007FF;
1576                 lp->hw->phy->current_channel = 5;
1577                 lp->hw->phy->symbol_duration = 25;
1578                 lp->hw->phy->supported.lbt = NL802154_SUPPORTED_BOOL_BOTH;
1579                 lp->hw->phy->supported.tx_powers = at86rf212_powers;
1580                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf212_powers);
1581                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
1582                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
1583                 break;
1584         case 11:
1585                 chip = "at86rf233";
1586                 lp->data = &at86rf233_data;
1587                 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1588                 lp->hw->phy->current_channel = 13;
1589                 lp->hw->phy->symbol_duration = 16;
1590                 lp->hw->phy->supported.tx_powers = at86rf233_powers;
1591                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf233_powers);
1592                 break;
1593         default:
1594                 chip = "unknown";
1595                 rc = -ENOTSUPP;
1596                 goto not_supp;
1597         }
1598
1599         lp->hw->phy->cca_ed_level = lp->hw->phy->supported.cca_ed_levels[7];
1600         lp->hw->phy->transmit_power = lp->hw->phy->supported.tx_powers[0];
1601
1602 not_supp:
1603         dev_info(&lp->spi->dev, "Detected %s chip version %d\n", chip, version);
1604
1605         return rc;
1606 }
1607
1608 #ifdef CONFIG_IEEE802154_AT86RF230_DEBUGFS
1609 static struct dentry *at86rf230_debugfs_root;
1610
1611 static int at86rf230_stats_show(struct seq_file *file, void *offset)
1612 {
1613         struct at86rf230_local *lp = file->private;
1614
1615         seq_printf(file, "SUCCESS:\t\t%8llu\n", lp->trac.success);
1616         seq_printf(file, "SUCCESS_DATA_PENDING:\t%8llu\n",
1617                    lp->trac.success_data_pending);
1618         seq_printf(file, "SUCCESS_WAIT_FOR_ACK:\t%8llu\n",
1619                    lp->trac.success_wait_for_ack);
1620         seq_printf(file, "CHANNEL_ACCESS_FAILURE:\t%8llu\n",
1621                    lp->trac.channel_access_failure);
1622         seq_printf(file, "NO_ACK:\t\t\t%8llu\n", lp->trac.no_ack);
1623         seq_printf(file, "INVALID:\t\t%8llu\n", lp->trac.invalid);
1624         return 0;
1625 }
1626
1627 static int at86rf230_stats_open(struct inode *inode, struct file *file)
1628 {
1629         return single_open(file, at86rf230_stats_show, inode->i_private);
1630 }
1631
1632 static const struct file_operations at86rf230_stats_fops = {
1633         .open           = at86rf230_stats_open,
1634         .read           = seq_read,
1635         .llseek         = seq_lseek,
1636         .release        = single_release,
1637 };
1638
1639 static int at86rf230_debugfs_init(struct at86rf230_local *lp)
1640 {
1641         char debugfs_dir_name[DNAME_INLINE_LEN + 1] = "at86rf230-";
1642         struct dentry *stats;
1643
1644         strncat(debugfs_dir_name, dev_name(&lp->spi->dev), DNAME_INLINE_LEN);
1645
1646         at86rf230_debugfs_root = debugfs_create_dir(debugfs_dir_name, NULL);
1647         if (!at86rf230_debugfs_root)
1648                 return -ENOMEM;
1649
1650         stats = debugfs_create_file("trac_stats", S_IRUGO,
1651                                     at86rf230_debugfs_root, lp,
1652                                     &at86rf230_stats_fops);
1653         if (!stats)
1654                 return -ENOMEM;
1655
1656         return 0;
1657 }
1658
1659 static void at86rf230_debugfs_remove(void)
1660 {
1661         debugfs_remove_recursive(at86rf230_debugfs_root);
1662 }
1663 #else
1664 static int at86rf230_debugfs_init(struct at86rf230_local *lp) { return 0; }
1665 static void at86rf230_debugfs_remove(void) { }
1666 #endif
1667
1668 static int at86rf230_probe(struct spi_device *spi)
1669 {
1670         struct ieee802154_hw *hw;
1671         struct at86rf230_local *lp;
1672         unsigned int status;
1673         int rc, irq_type, rstn, slp_tr;
1674         u8 xtal_trim = 0;
1675
1676         if (!spi->irq) {
1677                 dev_err(&spi->dev, "no IRQ specified\n");
1678                 return -EINVAL;
1679         }
1680
1681         rc = at86rf230_get_pdata(spi, &rstn, &slp_tr, &xtal_trim);
1682         if (rc < 0) {
1683                 dev_err(&spi->dev, "failed to parse platform_data: %d\n", rc);
1684                 return rc;
1685         }
1686
1687         if (gpio_is_valid(rstn)) {
1688                 rc = devm_gpio_request_one(&spi->dev, rstn,
1689                                            GPIOF_OUT_INIT_HIGH, "rstn");
1690                 if (rc)
1691                         return rc;
1692         }
1693
1694         if (gpio_is_valid(slp_tr)) {
1695                 rc = devm_gpio_request_one(&spi->dev, slp_tr,
1696                                            GPIOF_OUT_INIT_LOW, "slp_tr");
1697                 if (rc)
1698                         return rc;
1699         }
1700
1701         /* Reset */
1702         if (gpio_is_valid(rstn)) {
1703                 udelay(1);
1704                 gpio_set_value(rstn, 0);
1705                 udelay(1);
1706                 gpio_set_value(rstn, 1);
1707                 usleep_range(120, 240);
1708         }
1709
1710         hw = ieee802154_alloc_hw(sizeof(*lp), &at86rf230_ops);
1711         if (!hw)
1712                 return -ENOMEM;
1713
1714         lp = hw->priv;
1715         lp->hw = hw;
1716         lp->spi = spi;
1717         lp->slp_tr = slp_tr;
1718         hw->parent = &spi->dev;
1719         ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
1720
1721         lp->regmap = devm_regmap_init_spi(spi, &at86rf230_regmap_spi_config);
1722         if (IS_ERR(lp->regmap)) {
1723                 rc = PTR_ERR(lp->regmap);
1724                 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
1725                         rc);
1726                 goto free_dev;
1727         }
1728
1729         at86rf230_setup_spi_messages(lp, &lp->state);
1730         at86rf230_setup_spi_messages(lp, &lp->tx);
1731
1732         rc = at86rf230_detect_device(lp);
1733         if (rc < 0)
1734                 goto free_dev;
1735
1736         init_completion(&lp->state_complete);
1737
1738         spi_set_drvdata(spi, lp);
1739
1740         rc = at86rf230_hw_init(lp, xtal_trim);
1741         if (rc)
1742                 goto free_dev;
1743
1744         /* Read irq status register to reset irq line */
1745         rc = at86rf230_read_subreg(lp, RG_IRQ_STATUS, 0xff, 0, &status);
1746         if (rc)
1747                 goto free_dev;
1748
1749         irq_type = irq_get_trigger_type(spi->irq);
1750         if (!irq_type)
1751                 irq_type = IRQF_TRIGGER_HIGH;
1752
1753         rc = devm_request_irq(&spi->dev, spi->irq, at86rf230_isr,
1754                               IRQF_SHARED | irq_type, dev_name(&spi->dev), lp);
1755         if (rc)
1756                 goto free_dev;
1757
1758         /* disable_irq by default and wait for starting hardware */
1759         disable_irq(spi->irq);
1760
1761         /* going into sleep by default */
1762         at86rf230_sleep(lp);
1763
1764         rc = at86rf230_debugfs_init(lp);
1765         if (rc)
1766                 goto free_dev;
1767
1768         rc = ieee802154_register_hw(lp->hw);
1769         if (rc)
1770                 goto free_debugfs;
1771
1772         return rc;
1773
1774 free_debugfs:
1775         at86rf230_debugfs_remove();
1776 free_dev:
1777         ieee802154_free_hw(lp->hw);
1778
1779         return rc;
1780 }
1781
1782 static int at86rf230_remove(struct spi_device *spi)
1783 {
1784         struct at86rf230_local *lp = spi_get_drvdata(spi);
1785
1786         /* mask all at86rf230 irq's */
1787         at86rf230_write_subreg(lp, SR_IRQ_MASK, 0);
1788         ieee802154_unregister_hw(lp->hw);
1789         ieee802154_free_hw(lp->hw);
1790         at86rf230_debugfs_remove();
1791         dev_dbg(&spi->dev, "unregistered at86rf230\n");
1792
1793         return 0;
1794 }
1795
1796 static const struct of_device_id at86rf230_of_match[] = {
1797         { .compatible = "atmel,at86rf230", },
1798         { .compatible = "atmel,at86rf231", },
1799         { .compatible = "atmel,at86rf233", },
1800         { .compatible = "atmel,at86rf212", },
1801         { },
1802 };
1803 MODULE_DEVICE_TABLE(of, at86rf230_of_match);
1804
1805 static const struct spi_device_id at86rf230_device_id[] = {
1806         { .name = "at86rf230", },
1807         { .name = "at86rf231", },
1808         { .name = "at86rf233", },
1809         { .name = "at86rf212", },
1810         { },
1811 };
1812 MODULE_DEVICE_TABLE(spi, at86rf230_device_id);
1813
1814 static struct spi_driver at86rf230_driver = {
1815         .id_table = at86rf230_device_id,
1816         .driver = {
1817                 .of_match_table = of_match_ptr(at86rf230_of_match),
1818                 .name   = "at86rf230",
1819         },
1820         .probe      = at86rf230_probe,
1821         .remove     = at86rf230_remove,
1822 };
1823
1824 module_spi_driver(at86rf230_driver);
1825
1826 MODULE_DESCRIPTION("AT86RF230 Transceiver Driver");
1827 MODULE_LICENSE("GPL v2");