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_complete(void *context)
 347 {
 348         struct at86rf230_state_change *ctx = context;
 349         struct at86rf230_local *lp = ctx->lp;
 350
 351         if (ctx->free)
 352                 kfree(ctx);
 353
 354         ieee802154_wake_queue(lp->hw);
 355 }
 356
 357 static void
 358 at86rf230_async_error_recover(void *context)
 359 {
 360         struct at86rf230_state_change *ctx = context;
 361         struct at86rf230_local *lp = ctx->lp;
 362
 363         lp->is_tx = 0;
 364         at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON,
 365                                      at86rf230_async_error_recover_complete);
 366 }
 367
 368 static inline void
 369 at86rf230_async_error(struct at86rf230_local *lp,
 370                       struct at86rf230_state_change *ctx, int rc)
 371 {
 372         dev_err(&lp->spi->dev, "spi_async error %d\n", rc);
 373
 374         at86rf230_async_state_change(lp, ctx, STATE_FORCE_TRX_OFF,
 375                                      at86rf230_async_error_recover);
 376 }
 377
 378 /* Generic function to get some register value in async mode */
 379 static void
 380 at86rf230_async_read_reg(struct at86rf230_local *lp, u8 reg,
 381                          struct at86rf230_state_change *ctx,
 382                          void (*complete)(void *context))
 383 {
 384         int rc;
 385
 386         u8 *tx_buf = ctx->buf;
 387
 388         tx_buf[0] = (reg & CMD_REG_MASK) | CMD_REG;
 389         ctx->msg.complete = complete;
 390         rc = spi_async(lp->spi, &ctx->msg);
 391         if (rc)
 392                 at86rf230_async_error(lp, ctx, rc);
 393 }
 394
 395 static void
 396 at86rf230_async_write_reg(struct at86rf230_local *lp, u8 reg, u8 val,
 397                           struct at86rf230_state_change *ctx,
 398                           void (*complete)(void *context))
 399 {
 400         int rc;
 401
 402         ctx->buf[0] = (reg & CMD_REG_MASK) | CMD_REG | CMD_WRITE;
 403         ctx->buf[1] = val;
 404         ctx->msg.complete = complete;
 405         rc = spi_async(lp->spi, &ctx->msg);
 406         if (rc)
 407                 at86rf230_async_error(lp, ctx, rc);
 408 }
 409
 410 static void
 411 at86rf230_async_state_assert(void *context)
 412 {
 413         struct at86rf230_state_change *ctx = context;
 414         struct at86rf230_local *lp = ctx->lp;
 415         const u8 *buf = ctx->buf;
 416         const u8 trx_state = buf[1] & TRX_STATE_MASK;
 417
 418         /* Assert state change */
 419         if (trx_state != ctx->to_state) {
 420                 /* Special handling if transceiver state is in
 421                  * STATE_BUSY_RX_AACK and a SHR was detected.
 422                  */
 423                 if  (trx_state == STATE_BUSY_RX_AACK) {
 424                         /* Undocumented race condition. If we send a state
 425                          * change to STATE_RX_AACK_ON the transceiver could
 426                          * change his state automatically to STATE_BUSY_RX_AACK
 427                          * if a SHR was detected. This is not an error, but we
 428                          * can't assert this.
 429                          */
 430                         if (ctx->to_state == STATE_RX_AACK_ON)
 431                                 goto done;
 432
 433                         /* If we change to STATE_TX_ON without forcing and
 434                          * transceiver state is STATE_BUSY_RX_AACK, we wait
 435                          * 'tFrame + tPAck' receiving time. In this time the
 436                          * PDU should be received. If the transceiver is still
 437                          * in STATE_BUSY_RX_AACK, we run a force state change
 438                          * to STATE_TX_ON. This is a timeout handling, if the
 439                          * transceiver stucks in STATE_BUSY_RX_AACK.
 440                          *
 441                          * Additional we do several retries to try to get into
 442                          * TX_ON state without forcing. If the retries are
 443                          * higher or equal than AT86RF2XX_MAX_TX_RETRIES we
 444                          * will do a force change.
 445                          */
 446                         if (ctx->to_state == STATE_TX_ON ||
 447                             ctx->to_state == STATE_TRX_OFF) {
 448                                 u8 state = ctx->to_state;
 449
 450                                 if (lp->tx_retry >= AT86RF2XX_MAX_TX_RETRIES)
 451                                         state = STATE_FORCE_TRX_OFF;
 452                                 lp->tx_retry++;
 453
 454                                 at86rf230_async_state_change(lp, ctx, state,
 455                                                              ctx->complete);
 456                                 return;
 457                         }
 458                 }
 459
 460                 dev_warn(&lp->spi->dev, "unexcept state change from 0x%02x to 0x%02x. Actual state: 0x%02x\n",
 461                          ctx->from_state, ctx->to_state, trx_state);
 462         }
 463
 464 done:
 465         if (ctx->complete)
 466                 ctx->complete(context);
 467 }
 468
 469 static enum hrtimer_restart at86rf230_async_state_timer(struct hrtimer *timer)
 470 {
 471         struct at86rf230_state_change *ctx =
 472                 container_of(timer, struct at86rf230_state_change, timer);
 473         struct at86rf230_local *lp = ctx->lp;
 474
 475         at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 476                                  at86rf230_async_state_assert);
 477
 478         return HRTIMER_NORESTART;
 479 }
 480
 481 /* Do state change timing delay. */
 482 static void
 483 at86rf230_async_state_delay(void *context)
 484 {
 485         struct at86rf230_state_change *ctx = context;
 486         struct at86rf230_local *lp = ctx->lp;
 487         struct at86rf2xx_chip_data *c = lp->data;
 488         bool force = false;
 489         ktime_t tim;
 490
 491         /* The force state changes are will show as normal states in the
 492          * state status subregister. We change the to_state to the
 493          * corresponding one and remember if it was a force change, this
 494          * differs if we do a state change from STATE_BUSY_RX_AACK.
 495          */
 496         switch (ctx->to_state) {
 497         case STATE_FORCE_TX_ON:
 498                 ctx->to_state = STATE_TX_ON;
 499                 force = true;
 500                 break;
 501         case STATE_FORCE_TRX_OFF:
 502                 ctx->to_state = STATE_TRX_OFF;
 503                 force = true;
 504                 break;
 505         default:
 506                 break;
 507         }
 508
 509         switch (ctx->from_state) {
 510         case STATE_TRX_OFF:
 511                 switch (ctx->to_state) {
 512                 case STATE_RX_AACK_ON:
 513                         tim = c->t_off_to_aack * NSEC_PER_USEC;
 514                         /* state change from TRX_OFF to RX_AACK_ON to do a
 515                          * calibration, we need to reset the timeout for the
 516                          * next one.
 517                          */
 518                         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
 519                         goto change;
 520                 case STATE_TX_ARET_ON:
 521                 case STATE_TX_ON:
 522                         tim = c->t_off_to_tx_on * NSEC_PER_USEC;
 523                         /* state change from TRX_OFF to TX_ON or ARET_ON to do
 524                          * a calibration, we need to reset the timeout for the
 525                          * next one.
 526                          */
 527                         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
 528                         goto change;
 529                 default:
 530                         break;
 531                 }
 532                 break;
 533         case STATE_BUSY_RX_AACK:
 534                 switch (ctx->to_state) {
 535                 case STATE_TRX_OFF:
 536                 case STATE_TX_ON:
 537                         /* Wait for worst case receiving time if we
 538                          * didn't make a force change from BUSY_RX_AACK
 539                          * to TX_ON or TRX_OFF.
 540                          */
 541                         if (!force) {
 542                                 tim = (c->t_frame + c->t_p_ack) * NSEC_PER_USEC;
 543                                 goto change;
 544                         }
 545                         break;
 546                 default:
 547                         break;
 548                 }
 549                 break;
 550         /* Default value, means RESET state */
 551         case STATE_P_ON:
 552                 switch (ctx->to_state) {
 553                 case STATE_TRX_OFF:
 554                         tim = c->t_reset_to_off * NSEC_PER_USEC;
 555                         goto change;
 556                 default:
 557                         break;
 558                 }
 559                 break;
 560         default:
 561                 break;
 562         }
 563
 564         /* Default delay is 1us in the most cases */
 565         udelay(1);
 566         at86rf230_async_state_timer(&ctx->timer);
 567         return;
 568
 569 change:
 570         hrtimer_start(&ctx->timer, tim, HRTIMER_MODE_REL);
 571 }
 572
 573 static void
 574 at86rf230_async_state_change_start(void *context)
 575 {
 576         struct at86rf230_state_change *ctx = context;
 577         struct at86rf230_local *lp = ctx->lp;
 578         u8 *buf = ctx->buf;
 579         const u8 trx_state = buf[1] & TRX_STATE_MASK;
 580
 581         /* Check for "possible" STATE_TRANSITION_IN_PROGRESS */
 582         if (trx_state == STATE_TRANSITION_IN_PROGRESS) {
 583                 udelay(1);
 584                 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 585                                          at86rf230_async_state_change_start);
 586                 return;
 587         }
 588
 589         /* Check if we already are in the state which we change in */
 590         if (trx_state == ctx->to_state) {
 591                 if (ctx->complete)
 592                         ctx->complete(context);
 593                 return;
 594         }
 595
 596         /* Set current state to the context of state change */
 597         ctx->from_state = trx_state;
 598
 599         /* Going into the next step for a state change which do a timing
 600          * relevant delay.
 601          */
 602         at86rf230_async_write_reg(lp, RG_TRX_STATE, ctx->to_state, ctx,
 603                                   at86rf230_async_state_delay);
 604 }
 605
 606 static void
 607 at86rf230_async_state_change(struct at86rf230_local *lp,
 608                              struct at86rf230_state_change *ctx,
 609                              const u8 state, void (*complete)(void *context))
 610 {
 611         /* Initialization for the state change context */
 612         ctx->to_state = state;
 613         ctx->complete = complete;
 614         at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 615                                  at86rf230_async_state_change_start);
 616 }
 617
 618 static void
 619 at86rf230_sync_state_change_complete(void *context)
 620 {
 621         struct at86rf230_state_change *ctx = context;
 622         struct at86rf230_local *lp = ctx->lp;
 623
 624         complete(&lp->state_complete);
 625 }
 626
 627 /* This function do a sync framework above the async state change.
 628  * Some callbacks of the IEEE 802.15.4 driver interface need to be
 629  * handled synchronously.
 630  */
 631 static int
 632 at86rf230_sync_state_change(struct at86rf230_local *lp, unsigned int state)
 633 {
 634         unsigned long rc;
 635
 636         at86rf230_async_state_change(lp, &lp->state, state,
 637                                      at86rf230_sync_state_change_complete);
 638
 639         rc = wait_for_completion_timeout(&lp->state_complete,
 640                                          msecs_to_jiffies(100));
 641         if (!rc) {
 642                 at86rf230_async_error(lp, &lp->state, -ETIMEDOUT);
 643                 return -ETIMEDOUT;
 644         }
 645
 646         return 0;
 647 }
 648
 649 static void
 650 at86rf230_tx_complete(void *context)
 651 {
 652         struct at86rf230_state_change *ctx = context;
 653         struct at86rf230_local *lp = ctx->lp;
 654
 655         ieee802154_xmit_complete(lp->hw, lp->tx_skb, false);
 656         kfree(ctx);
 657 }
 658
 659 static void
 660 at86rf230_tx_on(void *context)
 661 {
 662         struct at86rf230_state_change *ctx = context;
 663         struct at86rf230_local *lp = ctx->lp;
 664
 665         at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON,
 666                                      at86rf230_tx_complete);
 667 }
 668
 669 static void
 670 at86rf230_tx_trac_check(void *context)
 671 {
 672         struct at86rf230_state_change *ctx = context;
 673         struct at86rf230_local *lp = ctx->lp;
 674
 675         if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS)) {
 676                 u8 trac = TRAC_MASK(ctx->buf[1]);
 677
 678                 switch (trac) {
 679                 case TRAC_SUCCESS:
 680                         lp->trac.success++;
 681                         break;
 682                 case TRAC_SUCCESS_DATA_PENDING:
 683                         lp->trac.success_data_pending++;
 684                         break;
 685                 case TRAC_CHANNEL_ACCESS_FAILURE:
 686                         lp->trac.channel_access_failure++;
 687                         break;
 688                 case TRAC_NO_ACK:
 689                         lp->trac.no_ack++;
 690                         break;
 691                 case TRAC_INVALID:
 692                         lp->trac.invalid++;
 693                         break;
 694                 default:
 695                         WARN_ONCE(1, "received tx trac status %d\n", trac);
 696                         break;
 697                 }
 698         }
 699
 700         at86rf230_async_state_change(lp, ctx, STATE_TX_ON, at86rf230_tx_on);
 701 }
 702
 703 static void
 704 at86rf230_rx_read_frame_complete(void *context)
 705 {
 706         struct at86rf230_state_change *ctx = context;
 707         struct at86rf230_local *lp = ctx->lp;
 708         const u8 *buf = ctx->buf;
 709         struct sk_buff *skb;
 710         u8 len, lqi;
 711
 712         len = buf[1];
 713         if (!ieee802154_is_valid_psdu_len(len)) {
 714                 dev_vdbg(&lp->spi->dev, "corrupted frame received\n");
 715                 len = IEEE802154_MTU;
 716         }
 717         lqi = buf[2 + len];
 718
 719         skb = dev_alloc_skb(IEEE802154_MTU);
 720         if (!skb) {
 721                 dev_vdbg(&lp->spi->dev, "failed to allocate sk_buff\n");
 722                 kfree(ctx);
 723                 return;
 724         }
 725
 726         skb_put_data(skb, buf + 2, len);
 727         ieee802154_rx_irqsafe(lp->hw, skb, lqi);
 728         kfree(ctx);
 729 }
 730
 731 static void
 732 at86rf230_rx_trac_check(void *context)
 733 {
 734         struct at86rf230_state_change *ctx = context;
 735         struct at86rf230_local *lp = ctx->lp;
 736         u8 *buf = ctx->buf;
 737         int rc;
 738
 739         if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS)) {
 740                 u8 trac = TRAC_MASK(buf[1]);
 741
 742                 switch (trac) {
 743                 case TRAC_SUCCESS:
 744                         lp->trac.success++;
 745                         break;
 746                 case TRAC_SUCCESS_WAIT_FOR_ACK:
 747                         lp->trac.success_wait_for_ack++;
 748                         break;
 749                 case TRAC_INVALID:
 750                         lp->trac.invalid++;
 751                         break;
 752                 default:
 753                         WARN_ONCE(1, "received rx trac status %d\n", trac);
 754                         break;
 755                 }
 756         }
 757
 758         buf[0] = CMD_FB;
 759         ctx->trx.len = AT86RF2XX_MAX_BUF;
 760         ctx->msg.complete = at86rf230_rx_read_frame_complete;
 761         rc = spi_async(lp->spi, &ctx->msg);
 762         if (rc) {
 763                 ctx->trx.len = 2;
 764                 at86rf230_async_error(lp, ctx, rc);
 765         }
 766 }
 767
 768 static void
 769 at86rf230_irq_trx_end(void *context)
 770 {
 771         struct at86rf230_state_change *ctx = context;
 772         struct at86rf230_local *lp = ctx->lp;
 773
 774         if (lp->is_tx) {
 775                 lp->is_tx = 0;
 776                 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx,
 777                                          at86rf230_tx_trac_check);
 778         } else {
 779                 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx,
 780                                          at86rf230_rx_trac_check);
 781         }
 782 }
 783
 784 static void
 785 at86rf230_irq_status(void *context)
 786 {
 787         struct at86rf230_state_change *ctx = context;
 788         struct at86rf230_local *lp = ctx->lp;
 789         const u8 *buf = ctx->buf;
 790         u8 irq = buf[1];
 791
 792         enable_irq(lp->spi->irq);
 793
 794         if (irq & IRQ_TRX_END) {
 795                 at86rf230_irq_trx_end(ctx);
 796         } else {
 797                 dev_err(&lp->spi->dev, "not supported irq %02x received\n",
 798                         irq);
 799                 kfree(ctx);
 800         }
 801 }
 802
 803 static void
 804 at86rf230_setup_spi_messages(struct at86rf230_local *lp,
 805                              struct at86rf230_state_change *state)
 806 {
 807         state->lp = lp;
 808         state->irq = lp->spi->irq;
 809         spi_message_init(&state->msg);
 810         state->msg.context = state;
 811         state->trx.len = 2;
 812         state->trx.tx_buf = state->buf;
 813         state->trx.rx_buf = state->buf;
 814         spi_message_add_tail(&state->trx, &state->msg);
 815         hrtimer_init(&state->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 816         state->timer.function = at86rf230_async_state_timer;
 817 }
 818
 819 static irqreturn_t at86rf230_isr(int irq, void *data)
 820 {
 821         struct at86rf230_local *lp = data;
 822         struct at86rf230_state_change *ctx;
 823         int rc;
 824
 825         disable_irq_nosync(irq);
 826
 827         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 828         if (!ctx) {
 829                 enable_irq(irq);
 830                 return IRQ_NONE;
 831         }
 832
 833         at86rf230_setup_spi_messages(lp, ctx);
 834         /* tell on error handling to free ctx */
 835         ctx->free = true;
 836
 837         ctx->buf[0] = (RG_IRQ_STATUS & CMD_REG_MASK) | CMD_REG;
 838         ctx->msg.complete = at86rf230_irq_status;
 839         rc = spi_async(lp->spi, &ctx->msg);
 840         if (rc) {
 841                 at86rf230_async_error(lp, ctx, rc);
 842                 enable_irq(irq);
 843                 return IRQ_NONE;
 844         }
 845
 846         return IRQ_HANDLED;
 847 }
 848
 849 static void
 850 at86rf230_write_frame_complete(void *context)
 851 {
 852         struct at86rf230_state_change *ctx = context;
 853         struct at86rf230_local *lp = ctx->lp;
 854
 855         ctx->trx.len = 2;
 856
 857         if (gpio_is_valid(lp->slp_tr))
 858                 at86rf230_slp_tr_rising_edge(lp);
 859         else
 860                 at86rf230_async_write_reg(lp, RG_TRX_STATE, STATE_BUSY_TX, ctx,
 861                                           NULL);
 862 }
 863
 864 static void
 865 at86rf230_write_frame(void *context)
 866 {
 867         struct at86rf230_state_change *ctx = context;
 868         struct at86rf230_local *lp = ctx->lp;
 869         struct sk_buff *skb = lp->tx_skb;
 870         u8 *buf = ctx->buf;
 871         int rc;
 872
 873         lp->is_tx = 1;
 874
 875         buf[0] = CMD_FB | CMD_WRITE;
 876         buf[1] = skb->len + 2;
 877         memcpy(buf + 2, skb->data, skb->len);
 878         ctx->trx.len = skb->len + 2;
 879         ctx->msg.complete = at86rf230_write_frame_complete;
 880         rc = spi_async(lp->spi, &ctx->msg);
 881         if (rc) {
 882                 ctx->trx.len = 2;
 883                 at86rf230_async_error(lp, ctx, rc);
 884         }
 885 }
 886
 887 static void
 888 at86rf230_xmit_tx_on(void *context)
 889 {
 890         struct at86rf230_state_change *ctx = context;
 891         struct at86rf230_local *lp = ctx->lp;
 892
 893         at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
 894                                      at86rf230_write_frame);
 895 }
 896
 897 static void
 898 at86rf230_xmit_start(void *context)
 899 {
 900         struct at86rf230_state_change *ctx = context;
 901         struct at86rf230_local *lp = ctx->lp;
 902
 903         /* check if we change from off state */
 904         if (lp->is_tx_from_off)
 905                 at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
 906                                              at86rf230_write_frame);
 907         else
 908                 at86rf230_async_state_change(lp, ctx, STATE_TX_ON,
 909                                              at86rf230_xmit_tx_on);
 910 }
 911
 912 static int
 913 at86rf230_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
 914 {
 915         struct at86rf230_local *lp = hw->priv;
 916         struct at86rf230_state_change *ctx = &lp->tx;
 917
 918         lp->tx_skb = skb;
 919         lp->tx_retry = 0;
 920
 921         /* After 5 minutes in PLL and the same frequency we run again the
 922          * calibration loops which is recommended by at86rf2xx datasheets.
 923          *
 924          * The calibration is initiate by a state change from TRX_OFF
 925          * to TX_ON, the lp->cal_timeout should be reinit by state_delay
 926          * function then to start in the next 5 minutes.
 927          */
 928         if (time_is_before_jiffies(lp->cal_timeout)) {
 929                 lp->is_tx_from_off = true;
 930                 at86rf230_async_state_change(lp, ctx, STATE_TRX_OFF,
 931                                              at86rf230_xmit_start);
 932         } else {
 933                 lp->is_tx_from_off = false;
 934                 at86rf230_xmit_start(ctx);
 935         }
 936
 937         return 0;
 938 }
 939
 940 static int
 941 at86rf230_ed(struct ieee802154_hw *hw, u8 *level)
 942 {
 943         BUG_ON(!level);
 944         *level = 0xbe;
 945         return 0;
 946 }
 947
 948 static int
 949 at86rf230_start(struct ieee802154_hw *hw)
 950 {
 951         struct at86rf230_local *lp = hw->priv;
 952
 953         /* reset trac stats on start */
 954         if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS))
 955                 memset(&lp->trac, 0, sizeof(struct at86rf230_trac));
 956
 957         at86rf230_awake(lp);
 958         enable_irq(lp->spi->irq);
 959
 960         return at86rf230_sync_state_change(lp, STATE_RX_AACK_ON);
 961 }
 962
 963 static void
 964 at86rf230_stop(struct ieee802154_hw *hw)
 965 {
 966         struct at86rf230_local *lp = hw->priv;
 967         u8 csma_seed[2];
 968
 969         at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
 970
 971         disable_irq(lp->spi->irq);
 972
 973         /* It's recommended to set random new csma_seeds before sleep state.
 974          * Makes only sense in the stop callback, not doing this inside of
 975          * at86rf230_sleep, this is also used when we don't transmit afterwards
 976          * when calling start callback again.
 977          */
 978         get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
 979         at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
 980         at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
 981
 982         at86rf230_sleep(lp);
 983 }
 984
 985 static int
 986 at86rf23x_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
 987 {
 988         return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
 989 }
 990
 991 #define AT86RF2XX_MAX_ED_LEVELS 0xF
 992 static const s32 at86rf233_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = {
 993         -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000, -7800, -7600,
 994         -7400, -7200, -7000, -6800, -6600, -6400,
 995 };
 996
 997 static const s32 at86rf231_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = {
 998         -9100, -8900, -8700, -8500, -8300, -8100, -7900, -7700, -7500, -7300,
 999         -7100, -6900, -6700, -6500, -6300, -6100,
1000 };
1001
1002 static const s32 at86rf212_ed_levels_100[AT86RF2XX_MAX_ED_LEVELS + 1] = {
1003         -10000, -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200,
1004         -8000, -7800, -7600, -7400, -7200, -7000,
1005 };
1006
1007 static const s32 at86rf212_ed_levels_98[AT86RF2XX_MAX_ED_LEVELS + 1] = {
1008         -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000,
1009         -7800, -7600, -7400, -7200, -7000, -6800,
1010 };
1011
1012 static inline int
1013 at86rf212_update_cca_ed_level(struct at86rf230_local *lp, int rssi_base_val)
1014 {
1015         unsigned int cca_ed_thres;
1016         int rc;
1017
1018         rc = at86rf230_read_subreg(lp, SR_CCA_ED_THRES, &cca_ed_thres);
1019         if (rc < 0)
1020                 return rc;
1021
1022         switch (rssi_base_val) {
1023         case -98:
1024                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_98;
1025                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_98);
1026                 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_98[cca_ed_thres];
1027                 break;
1028         case -100:
1029                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
1030                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
1031                 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_100[cca_ed_thres];
1032                 break;
1033         default:
1034                 WARN_ON(1);
1035         }
1036
1037         return 0;
1038 }
1039
1040 static int
1041 at86rf212_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
1042 {
1043         int rc;
1044
1045         if (channel == 0)
1046                 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 0);
1047         else
1048                 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 1);
1049         if (rc < 0)
1050                 return rc;
1051
1052         if (page == 0) {
1053                 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 0);
1054                 lp->data->rssi_base_val = -100;
1055         } else {
1056                 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 1);
1057                 lp->data->rssi_base_val = -98;
1058         }
1059         if (rc < 0)
1060                 return rc;
1061
1062         rc = at86rf212_update_cca_ed_level(lp, lp->data->rssi_base_val);
1063         if (rc < 0)
1064                 return rc;
1065
1066         /* This sets the symbol_duration according frequency on the 212.
1067          * TODO move this handling while set channel and page in cfg802154.
1068          * We can do that, this timings are according 802.15.4 standard.
1069          * If we do that in cfg802154, this is a more generic calculation.
1070          *
1071          * This should also protected from ifs_timer. Means cancel timer and
1072          * init with a new value. For now, this is okay.
1073          */
1074         if (channel == 0) {
1075                 if (page == 0) {
1076                         /* SUB:0 and BPSK:0 -> BPSK-20 */
1077                         lp->hw->phy->symbol_duration = 50;
1078                 } else {
1079                         /* SUB:1 and BPSK:0 -> BPSK-40 */
1080                         lp->hw->phy->symbol_duration = 25;
1081                 }
1082         } else {
1083                 if (page == 0)
1084                         /* SUB:0 and BPSK:1 -> OQPSK-100/200/400 */
1085                         lp->hw->phy->symbol_duration = 40;
1086                 else
1087                         /* SUB:1 and BPSK:1 -> OQPSK-250/500/1000 */
1088                         lp->hw->phy->symbol_duration = 16;
1089         }
1090
1091         lp->hw->phy->lifs_period = IEEE802154_LIFS_PERIOD *
1092                                    lp->hw->phy->symbol_duration;
1093         lp->hw->phy->sifs_period = IEEE802154_SIFS_PERIOD *
1094                                    lp->hw->phy->symbol_duration;
1095
1096         return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
1097 }
1098
1099 static int
1100 at86rf230_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
1101 {
1102         struct at86rf230_local *lp = hw->priv;
1103         int rc;
1104
1105         rc = lp->data->set_channel(lp, page, channel);
1106         /* Wait for PLL */
1107         usleep_range(lp->data->t_channel_switch,
1108                      lp->data->t_channel_switch + 10);
1109
1110         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
1111         return rc;
1112 }
1113
1114 static int
1115 at86rf230_set_hw_addr_filt(struct ieee802154_hw *hw,
1116                            struct ieee802154_hw_addr_filt *filt,
1117                            unsigned long changed)
1118 {
1119         struct at86rf230_local *lp = hw->priv;
1120
1121         if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
1122                 u16 addr = le16_to_cpu(filt->short_addr);
1123
1124                 dev_vdbg(&lp->spi->dev,
1125                          "at86rf230_set_hw_addr_filt called for saddr\n");
1126                 __at86rf230_write(lp, RG_SHORT_ADDR_0, addr);
1127                 __at86rf230_write(lp, RG_SHORT_ADDR_1, addr >> 8);
1128         }
1129
1130         if (changed & IEEE802154_AFILT_PANID_CHANGED) {
1131                 u16 pan = le16_to_cpu(filt->pan_id);
1132
1133                 dev_vdbg(&lp->spi->dev,
1134                          "at86rf230_set_hw_addr_filt called for pan id\n");
1135                 __at86rf230_write(lp, RG_PAN_ID_0, pan);
1136                 __at86rf230_write(lp, RG_PAN_ID_1, pan >> 8);
1137         }
1138
1139         if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
1140                 u8 i, addr[8];
1141
1142                 memcpy(addr, &filt->ieee_addr, 8);
1143                 dev_vdbg(&lp->spi->dev,
1144                          "at86rf230_set_hw_addr_filt called for IEEE addr\n");
1145                 for (i = 0; i < 8; i++)
1146                         __at86rf230_write(lp, RG_IEEE_ADDR_0 + i, addr[i]);
1147         }
1148
1149         if (changed & IEEE802154_AFILT_PANC_CHANGED) {
1150                 dev_vdbg(&lp->spi->dev,
1151                          "at86rf230_set_hw_addr_filt called for panc change\n");
1152                 if (filt->pan_coord)
1153                         at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 1);
1154                 else
1155                         at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 0);
1156         }
1157
1158         return 0;
1159 }
1160
1161 #define AT86RF23X_MAX_TX_POWERS 0xF
1162 static const s32 at86rf233_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1163         400, 370, 340, 300, 250, 200, 100, 0, -100, -200, -300, -400, -600,
1164         -800, -1200, -1700,
1165 };
1166
1167 static const s32 at86rf231_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1168         300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700,
1169         -900, -1200, -1700,
1170 };
1171
1172 #define AT86RF212_MAX_TX_POWERS 0x1F
1173 static const s32 at86rf212_powers[AT86RF212_MAX_TX_POWERS + 1] = {
1174         500, 400, 300, 200, 100, 0, -100, -200, -300, -400, -500, -600, -700,
1175         -800, -900, -1000, -1100, -1200, -1300, -1400, -1500, -1600, -1700,
1176         -1800, -1900, -2000, -2100, -2200, -2300, -2400, -2500, -2600,
1177 };
1178
1179 static int
1180 at86rf23x_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_23X, i);
1187         }
1188
1189         return -EINVAL;
1190 }
1191
1192 static int
1193 at86rf212_set_txpower(struct at86rf230_local *lp, s32 mbm)
1194 {
1195         u32 i;
1196
1197         for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1198                 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1199                         return at86rf230_write_subreg(lp, SR_TX_PWR_212, i);
1200         }
1201
1202         return -EINVAL;
1203 }
1204
1205 static int
1206 at86rf230_set_txpower(struct ieee802154_hw *hw, s32 mbm)
1207 {
1208         struct at86rf230_local *lp = hw->priv;
1209
1210         return lp->data->set_txpower(lp, mbm);
1211 }
1212
1213 static int
1214 at86rf230_set_lbt(struct ieee802154_hw *hw, bool on)
1215 {
1216         struct at86rf230_local *lp = hw->priv;
1217
1218         return at86rf230_write_subreg(lp, SR_CSMA_LBT_MODE, on);
1219 }
1220
1221 static int
1222 at86rf230_set_cca_mode(struct ieee802154_hw *hw,
1223                        const struct wpan_phy_cca *cca)
1224 {
1225         struct at86rf230_local *lp = hw->priv;
1226         u8 val;
1227
1228         /* mapping 802.15.4 to driver spec */
1229         switch (cca->mode) {
1230         case NL802154_CCA_ENERGY:
1231                 val = 1;
1232                 break;
1233         case NL802154_CCA_CARRIER:
1234                 val = 2;
1235                 break;
1236         case NL802154_CCA_ENERGY_CARRIER:
1237                 switch (cca->opt) {
1238                 case NL802154_CCA_OPT_ENERGY_CARRIER_AND:
1239                         val = 3;
1240                         break;
1241                 case NL802154_CCA_OPT_ENERGY_CARRIER_OR:
1242                         val = 0;
1243                         break;
1244                 default:
1245                         return -EINVAL;
1246                 }
1247                 break;
1248         default:
1249                 return -EINVAL;
1250         }
1251
1252         return at86rf230_write_subreg(lp, SR_CCA_MODE, val);
1253 }
1254
1255
1256 static int
1257 at86rf230_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
1258 {
1259         struct at86rf230_local *lp = hw->priv;
1260         u32 i;
1261
1262         for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) {
1263                 if (hw->phy->supported.cca_ed_levels[i] == mbm)
1264                         return at86rf230_write_subreg(lp, SR_CCA_ED_THRES, i);
1265         }
1266
1267         return -EINVAL;
1268 }
1269
1270 static int
1271 at86rf230_set_csma_params(struct ieee802154_hw *hw, u8 min_be, u8 max_be,
1272                           u8 retries)
1273 {
1274         struct at86rf230_local *lp = hw->priv;
1275         int rc;
1276
1277         rc = at86rf230_write_subreg(lp, SR_MIN_BE, min_be);
1278         if (rc)
1279                 return rc;
1280
1281         rc = at86rf230_write_subreg(lp, SR_MAX_BE, max_be);
1282         if (rc)
1283                 return rc;
1284
1285         return at86rf230_write_subreg(lp, SR_MAX_CSMA_RETRIES, retries);
1286 }
1287
1288 static int
1289 at86rf230_set_frame_retries(struct ieee802154_hw *hw, s8 retries)
1290 {
1291         struct at86rf230_local *lp = hw->priv;
1292
1293         return at86rf230_write_subreg(lp, SR_MAX_FRAME_RETRIES, retries);
1294 }
1295
1296 static int
1297 at86rf230_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
1298 {
1299         struct at86rf230_local *lp = hw->priv;
1300         int rc;
1301
1302         if (on) {
1303                 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 1);
1304                 if (rc < 0)
1305                         return rc;
1306
1307                 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 1);
1308                 if (rc < 0)
1309                         return rc;
1310         } else {
1311                 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 0);
1312                 if (rc < 0)
1313                         return rc;
1314
1315                 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 0);
1316                 if (rc < 0)
1317                         return rc;
1318         }
1319
1320         return 0;
1321 }
1322
1323 static const struct ieee802154_ops at86rf230_ops = {
1324         .owner = THIS_MODULE,
1325         .xmit_async = at86rf230_xmit,
1326         .ed = at86rf230_ed,
1327         .set_channel = at86rf230_channel,
1328         .start = at86rf230_start,
1329         .stop = at86rf230_stop,
1330         .set_hw_addr_filt = at86rf230_set_hw_addr_filt,
1331         .set_txpower = at86rf230_set_txpower,
1332         .set_lbt = at86rf230_set_lbt,
1333         .set_cca_mode = at86rf230_set_cca_mode,
1334         .set_cca_ed_level = at86rf230_set_cca_ed_level,
1335         .set_csma_params = at86rf230_set_csma_params,
1336         .set_frame_retries = at86rf230_set_frame_retries,
1337         .set_promiscuous_mode = at86rf230_set_promiscuous_mode,
1338 };
1339
1340 static struct at86rf2xx_chip_data at86rf233_data = {
1341         .t_sleep_cycle = 330,
1342         .t_channel_switch = 11,
1343         .t_reset_to_off = 26,
1344         .t_off_to_aack = 80,
1345         .t_off_to_tx_on = 80,
1346         .t_off_to_sleep = 35,
1347         .t_sleep_to_off = 1000,
1348         .t_frame = 4096,
1349         .t_p_ack = 545,
1350         .rssi_base_val = -94,
1351         .set_channel = at86rf23x_set_channel,
1352         .set_txpower = at86rf23x_set_txpower,
1353 };
1354
1355 static struct at86rf2xx_chip_data at86rf231_data = {
1356         .t_sleep_cycle = 330,
1357         .t_channel_switch = 24,
1358         .t_reset_to_off = 37,
1359         .t_off_to_aack = 110,
1360         .t_off_to_tx_on = 110,
1361         .t_off_to_sleep = 35,
1362         .t_sleep_to_off = 1000,
1363         .t_frame = 4096,
1364         .t_p_ack = 545,
1365         .rssi_base_val = -91,
1366         .set_channel = at86rf23x_set_channel,
1367         .set_txpower = at86rf23x_set_txpower,
1368 };
1369
1370 static struct at86rf2xx_chip_data at86rf212_data = {
1371         .t_sleep_cycle = 330,
1372         .t_channel_switch = 11,
1373         .t_reset_to_off = 26,
1374         .t_off_to_aack = 200,
1375         .t_off_to_tx_on = 200,
1376         .t_off_to_sleep = 35,
1377         .t_sleep_to_off = 1000,
1378         .t_frame = 4096,
1379         .t_p_ack = 545,
1380         .rssi_base_val = -100,
1381         .set_channel = at86rf212_set_channel,
1382         .set_txpower = at86rf212_set_txpower,
1383 };
1384
1385 static int at86rf230_hw_init(struct at86rf230_local *lp, u8 xtal_trim)
1386 {
1387         int rc, irq_type, irq_pol = IRQ_ACTIVE_HIGH;
1388         unsigned int dvdd;
1389         u8 csma_seed[2];
1390
1391         rc = at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
1392         if (rc)
1393                 return rc;
1394
1395         irq_type = irq_get_trigger_type(lp->spi->irq);
1396         if (irq_type == IRQ_TYPE_EDGE_FALLING ||
1397             irq_type == IRQ_TYPE_LEVEL_LOW)
1398                 irq_pol = IRQ_ACTIVE_LOW;
1399
1400         rc = at86rf230_write_subreg(lp, SR_IRQ_POLARITY, irq_pol);
1401         if (rc)
1402                 return rc;
1403
1404         rc = at86rf230_write_subreg(lp, SR_RX_SAFE_MODE, 1);
1405         if (rc)
1406                 return rc;
1407
1408         rc = at86rf230_write_subreg(lp, SR_IRQ_MASK, IRQ_TRX_END);
1409         if (rc)
1410                 return rc;
1411
1412         /* reset values differs in at86rf231 and at86rf233 */
1413         rc = at86rf230_write_subreg(lp, SR_IRQ_MASK_MODE, 0);
1414         if (rc)
1415                 return rc;
1416
1417         get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
1418         rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
1419         if (rc)
1420                 return rc;
1421         rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
1422         if (rc)
1423                 return rc;
1424
1425         /* CLKM changes are applied immediately */
1426         rc = at86rf230_write_subreg(lp, SR_CLKM_SHA_SEL, 0x00);
1427         if (rc)
1428                 return rc;
1429
1430         /* Turn CLKM Off */
1431         rc = at86rf230_write_subreg(lp, SR_CLKM_CTRL, 0x00);
1432         if (rc)
1433                 return rc;
1434         /* Wait the next SLEEP cycle */
1435         usleep_range(lp->data->t_sleep_cycle,
1436                      lp->data->t_sleep_cycle + 100);
1437
1438         /* xtal_trim value is calculated by:
1439          * CL = 0.5 * (CX + CTRIM + CPAR)
1440          *
1441          * whereas:
1442          * CL = capacitor of used crystal
1443          * CX = connected capacitors at xtal pins
1444          * CPAR = in all at86rf2xx datasheets this is a constant value 3 pF,
1445          *        but this is different on each board setup. You need to fine
1446          *        tuning this value via CTRIM.
1447          * CTRIM = variable capacitor setting. Resolution is 0.3 pF range is
1448          *         0 pF upto 4.5 pF.
1449          *
1450          * Examples:
1451          * atben transceiver:
1452          *
1453          * CL = 8 pF
1454          * CX = 12 pF
1455          * CPAR = 3 pF (We assume the magic constant from datasheet)
1456          * CTRIM = 0.9 pF
1457          *
1458          * (12+0.9+3)/2 = 7.95 which is nearly at 8 pF
1459          *
1460          * xtal_trim = 0x3
1461          *
1462          * openlabs transceiver:
1463          *
1464          * CL = 16 pF
1465          * CX = 22 pF
1466          * CPAR = 3 pF (We assume the magic constant from datasheet)
1467          * CTRIM = 4.5 pF
1468          *
1469          * (22+4.5+3)/2 = 14.75 which is the nearest value to 16 pF
1470          *
1471          * xtal_trim = 0xf
1472          */
1473         rc = at86rf230_write_subreg(lp, SR_XTAL_TRIM, xtal_trim);
1474         if (rc)
1475                 return rc;
1476
1477         rc = at86rf230_read_subreg(lp, SR_DVDD_OK, &dvdd);
1478         if (rc)
1479                 return rc;
1480         if (!dvdd) {
1481                 dev_err(&lp->spi->dev, "DVDD error\n");
1482                 return -EINVAL;
1483         }
1484
1485         /* Force setting slotted operation bit to 0. Sometimes the atben
1486          * sets this bit and I don't know why. We set this always force
1487          * to zero while probing.
1488          */
1489         return at86rf230_write_subreg(lp, SR_SLOTTED_OPERATION, 0);
1490 }
1491
1492 static int
1493 at86rf230_get_pdata(struct spi_device *spi, int *rstn, int *slp_tr,
1494                     u8 *xtal_trim)
1495 {
1496         struct at86rf230_platform_data *pdata = spi->dev.platform_data;
1497         int ret;
1498
1499         if (!IS_ENABLED(CONFIG_OF) || !spi->dev.of_node) {
1500                 if (!pdata)
1501                         return -ENOENT;
1502
1503                 *rstn = pdata->rstn;
1504                 *slp_tr = pdata->slp_tr;
1505                 *xtal_trim = pdata->xtal_trim;
1506                 return 0;
1507         }
1508
1509         *rstn = of_get_named_gpio(spi->dev.of_node, "reset-gpio", 0);
1510         *slp_tr = of_get_named_gpio(spi->dev.of_node, "sleep-gpio", 0);
1511         ret = of_property_read_u8(spi->dev.of_node, "xtal-trim", xtal_trim);
1512         if (ret < 0 && ret != -EINVAL)
1513                 return ret;
1514
1515         return 0;
1516 }
1517
1518 static int
1519 at86rf230_detect_device(struct at86rf230_local *lp)
1520 {
1521         unsigned int part, version, val;
1522         u16 man_id = 0;
1523         const char *chip;
1524         int rc;
1525
1526         rc = __at86rf230_read(lp, RG_MAN_ID_0, &val);
1527         if (rc)
1528                 return rc;
1529         man_id |= val;
1530
1531         rc = __at86rf230_read(lp, RG_MAN_ID_1, &val);
1532         if (rc)
1533                 return rc;
1534         man_id |= (val << 8);
1535
1536         rc = __at86rf230_read(lp, RG_PART_NUM, &part);
1537         if (rc)
1538                 return rc;
1539
1540         rc = __at86rf230_read(lp, RG_VERSION_NUM, &version);
1541         if (rc)
1542                 return rc;
1543
1544         if (man_id != 0x001f) {
1545                 dev_err(&lp->spi->dev, "Non-Atmel dev found (MAN_ID %02x %02x)\n",
1546                         man_id >> 8, man_id & 0xFF);
1547                 return -EINVAL;
1548         }
1549
1550         lp->hw->flags = IEEE802154_HW_TX_OMIT_CKSUM |
1551                         IEEE802154_HW_CSMA_PARAMS |
1552                         IEEE802154_HW_FRAME_RETRIES | IEEE802154_HW_AFILT |
1553                         IEEE802154_HW_PROMISCUOUS;
1554
1555         lp->hw->phy->flags = WPAN_PHY_FLAG_TXPOWER |
1556                              WPAN_PHY_FLAG_CCA_ED_LEVEL |
1557                              WPAN_PHY_FLAG_CCA_MODE;
1558
1559         lp->hw->phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY) |
1560                 BIT(NL802154_CCA_CARRIER) | BIT(NL802154_CCA_ENERGY_CARRIER);
1561         lp->hw->phy->supported.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND) |
1562                 BIT(NL802154_CCA_OPT_ENERGY_CARRIER_OR);
1563
1564         lp->hw->phy->cca.mode = NL802154_CCA_ENERGY;
1565
1566         switch (part) {
1567         case 2:
1568                 chip = "at86rf230";
1569                 rc = -ENOTSUPP;
1570                 goto not_supp;
1571         case 3:
1572                 chip = "at86rf231";
1573                 lp->data = &at86rf231_data;
1574                 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1575                 lp->hw->phy->current_channel = 11;
1576                 lp->hw->phy->symbol_duration = 16;
1577                 lp->hw->phy->supported.tx_powers = at86rf231_powers;
1578                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf231_powers);
1579                 lp->hw->phy->supported.cca_ed_levels = at86rf231_ed_levels;
1580                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf231_ed_levels);
1581                 break;
1582         case 7:
1583                 chip = "at86rf212";
1584                 lp->data = &at86rf212_data;
1585                 lp->hw->flags |= IEEE802154_HW_LBT;
1586                 lp->hw->phy->supported.channels[0] = 0x00007FF;
1587                 lp->hw->phy->supported.channels[2] = 0x00007FF;
1588                 lp->hw->phy->current_channel = 5;
1589                 lp->hw->phy->symbol_duration = 25;
1590                 lp->hw->phy->supported.lbt = NL802154_SUPPORTED_BOOL_BOTH;
1591                 lp->hw->phy->supported.tx_powers = at86rf212_powers;
1592                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf212_powers);
1593                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
1594                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
1595                 break;
1596         case 11:
1597                 chip = "at86rf233";
1598                 lp->data = &at86rf233_data;
1599                 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1600                 lp->hw->phy->current_channel = 13;
1601                 lp->hw->phy->symbol_duration = 16;
1602                 lp->hw->phy->supported.tx_powers = at86rf233_powers;
1603                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf233_powers);
1604                 lp->hw->phy->supported.cca_ed_levels = at86rf233_ed_levels;
1605                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf233_ed_levels);
1606                 break;
1607         default:
1608                 chip = "unknown";
1609                 rc = -ENOTSUPP;
1610                 goto not_supp;
1611         }
1612
1613         lp->hw->phy->cca_ed_level = lp->hw->phy->supported.cca_ed_levels[7];
1614         lp->hw->phy->transmit_power = lp->hw->phy->supported.tx_powers[0];
1615
1616 not_supp:
1617         dev_info(&lp->spi->dev, "Detected %s chip version %d\n", chip, version);
1618
1619         return rc;
1620 }
1621
1622 #ifdef CONFIG_IEEE802154_AT86RF230_DEBUGFS
1623 static struct dentry *at86rf230_debugfs_root;
1624
1625 static int at86rf230_stats_show(struct seq_file *file, void *offset)
1626 {
1627         struct at86rf230_local *lp = file->private;
1628
1629         seq_printf(file, "SUCCESS:\t\t%8llu\n", lp->trac.success);
1630         seq_printf(file, "SUCCESS_DATA_PENDING:\t%8llu\n",
1631                    lp->trac.success_data_pending);
1632         seq_printf(file, "SUCCESS_WAIT_FOR_ACK:\t%8llu\n",
1633                    lp->trac.success_wait_for_ack);
1634         seq_printf(file, "CHANNEL_ACCESS_FAILURE:\t%8llu\n",
1635                    lp->trac.channel_access_failure);
1636         seq_printf(file, "NO_ACK:\t\t\t%8llu\n", lp->trac.no_ack);
1637         seq_printf(file, "INVALID:\t\t%8llu\n", lp->trac.invalid);
1638         return 0;
1639 }
1640
1641 static int at86rf230_stats_open(struct inode *inode, struct file *file)
1642 {
1643         return single_open(file, at86rf230_stats_show, inode->i_private);
1644 }
1645
1646 static const struct file_operations at86rf230_stats_fops = {
1647         .open           = at86rf230_stats_open,
1648         .read           = seq_read,
1649         .llseek         = seq_lseek,
1650         .release        = single_release,
1651 };
1652
1653 static int at86rf230_debugfs_init(struct at86rf230_local *lp)
1654 {
1655         char debugfs_dir_name[DNAME_INLINE_LEN + 1] = "at86rf230-";
1656         struct dentry *stats;
1657
1658         strncat(debugfs_dir_name, dev_name(&lp->spi->dev), DNAME_INLINE_LEN);
1659
1660         at86rf230_debugfs_root = debugfs_create_dir(debugfs_dir_name, NULL);
1661         if (!at86rf230_debugfs_root)
1662                 return -ENOMEM;
1663
1664         stats = debugfs_create_file("trac_stats", 0444,
1665                                     at86rf230_debugfs_root, lp,
1666                                     &at86rf230_stats_fops);
1667         if (!stats)
1668                 return -ENOMEM;
1669
1670         return 0;
1671 }
1672
1673 static void at86rf230_debugfs_remove(void)
1674 {
1675         debugfs_remove_recursive(at86rf230_debugfs_root);
1676 }
1677 #else
1678 static int at86rf230_debugfs_init(struct at86rf230_local *lp) { return 0; }
1679 static void at86rf230_debugfs_remove(void) { }
1680 #endif
1681
1682 static int at86rf230_probe(struct spi_device *spi)
1683 {
1684         struct ieee802154_hw *hw;
1685         struct at86rf230_local *lp;
1686         unsigned int status;
1687         int rc, irq_type, rstn, slp_tr;
1688         u8 xtal_trim = 0;
1689
1690         if (!spi->irq) {
1691                 dev_err(&spi->dev, "no IRQ specified\n");
1692                 return -EINVAL;
1693         }
1694
1695         rc = at86rf230_get_pdata(spi, &rstn, &slp_tr, &xtal_trim);
1696         if (rc < 0) {
1697                 dev_err(&spi->dev, "failed to parse platform_data: %d\n", rc);
1698                 return rc;
1699         }
1700
1701         if (gpio_is_valid(rstn)) {
1702                 rc = devm_gpio_request_one(&spi->dev, rstn,
1703                                            GPIOF_OUT_INIT_HIGH, "rstn");
1704                 if (rc)
1705                         return rc;
1706         }
1707
1708         if (gpio_is_valid(slp_tr)) {
1709                 rc = devm_gpio_request_one(&spi->dev, slp_tr,
1710                                            GPIOF_OUT_INIT_LOW, "slp_tr");
1711                 if (rc)
1712                         return rc;
1713         }
1714
1715         /* Reset */
1716         if (gpio_is_valid(rstn)) {
1717                 udelay(1);
1718                 gpio_set_value_cansleep(rstn, 0);
1719                 udelay(1);
1720                 gpio_set_value_cansleep(rstn, 1);
1721                 usleep_range(120, 240);
1722         }
1723
1724         hw = ieee802154_alloc_hw(sizeof(*lp), &at86rf230_ops);
1725         if (!hw)
1726                 return -ENOMEM;
1727
1728         lp = hw->priv;
1729         lp->hw = hw;
1730         lp->spi = spi;
1731         lp->slp_tr = slp_tr;
1732         hw->parent = &spi->dev;
1733         ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
1734
1735         lp->regmap = devm_regmap_init_spi(spi, &at86rf230_regmap_spi_config);
1736         if (IS_ERR(lp->regmap)) {
1737                 rc = PTR_ERR(lp->regmap);
1738                 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
1739                         rc);
1740                 goto free_dev;
1741         }
1742
1743         at86rf230_setup_spi_messages(lp, &lp->state);
1744         at86rf230_setup_spi_messages(lp, &lp->tx);
1745
1746         rc = at86rf230_detect_device(lp);
1747         if (rc < 0)
1748                 goto free_dev;
1749
1750         init_completion(&lp->state_complete);
1751
1752         spi_set_drvdata(spi, lp);
1753
1754         rc = at86rf230_hw_init(lp, xtal_trim);
1755         if (rc)
1756                 goto free_dev;
1757
1758         /* Read irq status register to reset irq line */
1759         rc = at86rf230_read_subreg(lp, RG_IRQ_STATUS, 0xff, 0, &status);
1760         if (rc)
1761                 goto free_dev;
1762
1763         irq_type = irq_get_trigger_type(spi->irq);
1764         if (!irq_type)
1765                 irq_type = IRQF_TRIGGER_HIGH;
1766
1767         rc = devm_request_irq(&spi->dev, spi->irq, at86rf230_isr,
1768                               IRQF_SHARED | irq_type, dev_name(&spi->dev), lp);
1769         if (rc)
1770                 goto free_dev;
1771
1772         /* disable_irq by default and wait for starting hardware */
1773         disable_irq(spi->irq);
1774
1775         /* going into sleep by default */
1776         at86rf230_sleep(lp);
1777
1778         rc = at86rf230_debugfs_init(lp);
1779         if (rc)
1780                 goto free_dev;
1781
1782         rc = ieee802154_register_hw(lp->hw);
1783         if (rc)
1784                 goto free_debugfs;
1785
1786         return rc;
1787
1788 free_debugfs:
1789         at86rf230_debugfs_remove();
1790 free_dev:
1791         ieee802154_free_hw(lp->hw);
1792
1793         return rc;
1794 }
1795
1796 static int at86rf230_remove(struct spi_device *spi)
1797 {
1798         struct at86rf230_local *lp = spi_get_drvdata(spi);
1799
1800         /* mask all at86rf230 irq's */
1801         at86rf230_write_subreg(lp, SR_IRQ_MASK, 0);
1802         ieee802154_unregister_hw(lp->hw);
1803         ieee802154_free_hw(lp->hw);
1804         at86rf230_debugfs_remove();
1805         dev_dbg(&spi->dev, "unregistered at86rf230\n");
1806
1807         return 0;
1808 }
1809
1810 static const struct of_device_id at86rf230_of_match[] = {
1811         { .compatible = "atmel,at86rf230", },
1812         { .compatible = "atmel,at86rf231", },
1813         { .compatible = "atmel,at86rf233", },
1814         { .compatible = "atmel,at86rf212", },
1815         { },
1816 };
1817 MODULE_DEVICE_TABLE(of, at86rf230_of_match);
1818
1819 static const struct spi_device_id at86rf230_device_id[] = {
1820         { .name = "at86rf230", },
1821         { .name = "at86rf231", },
1822         { .name = "at86rf233", },
1823         { .name = "at86rf212", },
1824         { },
1825 };
1826 MODULE_DEVICE_TABLE(spi, at86rf230_device_id);
1827
1828 static struct spi_driver at86rf230_driver = {
1829         .id_table = at86rf230_device_id,
1830         .driver = {
1831                 .of_match_table = of_match_ptr(at86rf230_of_match),
1832                 .name   = "at86rf230",
1833         },
1834         .probe      = at86rf230_probe,
1835         .remove     = at86rf230_remove,
1836 };
1837
1838 module_spi_driver(at86rf230_driver);
1839
1840 MODULE_DESCRIPTION("AT86RF230 Transceiver Driver");
1841 MODULE_LICENSE("GPL v2");