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 = ktime_set(0, 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 = ktime_set(0, 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 = ktime_set(0, (c->t_frame + c->t_p_ack) *
 543                                                    NSEC_PER_USEC);
 544                                 goto change;
 545                         }
 546                         break;
 547                 default:
 548                         break;
 549                 }
 550                 break;
 551         /* Default value, means RESET state */
 552         case STATE_P_ON:
 553                 switch (ctx->to_state) {
 554                 case STATE_TRX_OFF:
 555                         tim = ktime_set(0, c->t_reset_to_off * NSEC_PER_USEC);
 556                         goto change;
 557                 default:
 558                         break;
 559                 }
 560                 break;
 561         default:
 562                 break;
 563         }
 564
 565         /* Default delay is 1us in the most cases */
 566         udelay(1);
 567         at86rf230_async_state_timer(&ctx->timer);
 568         return;
 569
 570 change:
 571         hrtimer_start(&ctx->timer, tim, HRTIMER_MODE_REL);
 572 }
 573
 574 static void
 575 at86rf230_async_state_change_start(void *context)
 576 {
 577         struct at86rf230_state_change *ctx = context;
 578         struct at86rf230_local *lp = ctx->lp;
 579         u8 *buf = ctx->buf;
 580         const u8 trx_state = buf[1] & TRX_STATE_MASK;
 581
 582         /* Check for "possible" STATE_TRANSITION_IN_PROGRESS */
 583         if (trx_state == STATE_TRANSITION_IN_PROGRESS) {
 584                 udelay(1);
 585                 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 586                                          at86rf230_async_state_change_start);
 587                 return;
 588         }
 589
 590         /* Check if we already are in the state which we change in */
 591         if (trx_state == ctx->to_state) {
 592                 if (ctx->complete)
 593                         ctx->complete(context);
 594                 return;
 595         }
 596
 597         /* Set current state to the context of state change */
 598         ctx->from_state = trx_state;
 599
 600         /* Going into the next step for a state change which do a timing
 601          * relevant delay.
 602          */
 603         at86rf230_async_write_reg(lp, RG_TRX_STATE, ctx->to_state, ctx,
 604                                   at86rf230_async_state_delay);
 605 }
 606
 607 static void
 608 at86rf230_async_state_change(struct at86rf230_local *lp,
 609                              struct at86rf230_state_change *ctx,
 610                              const u8 state, void (*complete)(void *context))
 611 {
 612         /* Initialization for the state change context */
 613         ctx->to_state = state;
 614         ctx->complete = complete;
 615         at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 616                                  at86rf230_async_state_change_start);
 617 }
 618
 619 static void
 620 at86rf230_sync_state_change_complete(void *context)
 621 {
 622         struct at86rf230_state_change *ctx = context;
 623         struct at86rf230_local *lp = ctx->lp;
 624
 625         complete(&lp->state_complete);
 626 }
 627
 628 /* This function do a sync framework above the async state change.
 629  * Some callbacks of the IEEE 802.15.4 driver interface need to be
 630  * handled synchronously.
 631  */
 632 static int
 633 at86rf230_sync_state_change(struct at86rf230_local *lp, unsigned int state)
 634 {
 635         unsigned long rc;
 636
 637         at86rf230_async_state_change(lp, &lp->state, state,
 638                                      at86rf230_sync_state_change_complete);
 639
 640         rc = wait_for_completion_timeout(&lp->state_complete,
 641                                          msecs_to_jiffies(100));
 642         if (!rc) {
 643                 at86rf230_async_error(lp, &lp->state, -ETIMEDOUT);
 644                 return -ETIMEDOUT;
 645         }
 646
 647         return 0;
 648 }
 649
 650 static void
 651 at86rf230_tx_complete(void *context)
 652 {
 653         struct at86rf230_state_change *ctx = context;
 654         struct at86rf230_local *lp = ctx->lp;
 655
 656         ieee802154_xmit_complete(lp->hw, lp->tx_skb, false);
 657         kfree(ctx);
 658 }
 659
 660 static void
 661 at86rf230_tx_on(void *context)
 662 {
 663         struct at86rf230_state_change *ctx = context;
 664         struct at86rf230_local *lp = ctx->lp;
 665
 666         at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON,
 667                                      at86rf230_tx_complete);
 668 }
 669
 670 static void
 671 at86rf230_tx_trac_check(void *context)
 672 {
 673         struct at86rf230_state_change *ctx = context;
 674         struct at86rf230_local *lp = ctx->lp;
 675
 676         if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS)) {
 677                 u8 trac = TRAC_MASK(ctx->buf[1]);
 678
 679                 switch (trac) {
 680                 case TRAC_SUCCESS:
 681                         lp->trac.success++;
 682                         break;
 683                 case TRAC_SUCCESS_DATA_PENDING:
 684                         lp->trac.success_data_pending++;
 685                         break;
 686                 case TRAC_CHANNEL_ACCESS_FAILURE:
 687                         lp->trac.channel_access_failure++;
 688                         break;
 689                 case TRAC_NO_ACK:
 690                         lp->trac.no_ack++;
 691                         break;
 692                 case TRAC_INVALID:
 693                         lp->trac.invalid++;
 694                         break;
 695                 default:
 696                         WARN_ONCE(1, "received tx trac status %d\n", trac);
 697                         break;
 698                 }
 699         }
 700
 701         at86rf230_async_state_change(lp, ctx, STATE_TX_ON, at86rf230_tx_on);
 702 }
 703
 704 static void
 705 at86rf230_rx_read_frame_complete(void *context)
 706 {
 707         struct at86rf230_state_change *ctx = context;
 708         struct at86rf230_local *lp = ctx->lp;
 709         const u8 *buf = ctx->buf;
 710         struct sk_buff *skb;
 711         u8 len, lqi;
 712
 713         len = buf[1];
 714         if (!ieee802154_is_valid_psdu_len(len)) {
 715                 dev_vdbg(&lp->spi->dev, "corrupted frame received\n");
 716                 len = IEEE802154_MTU;
 717         }
 718         lqi = buf[2 + len];
 719
 720         skb = dev_alloc_skb(IEEE802154_MTU);
 721         if (!skb) {
 722                 dev_vdbg(&lp->spi->dev, "failed to allocate sk_buff\n");
 723                 kfree(ctx);
 724                 return;
 725         }
 726
 727         memcpy(skb_put(skb, len), buf + 2, len);
 728         ieee802154_rx_irqsafe(lp->hw, skb, lqi);
 729         kfree(ctx);
 730 }
 731
 732 static void
 733 at86rf230_rx_trac_check(void *context)
 734 {
 735         struct at86rf230_state_change *ctx = context;
 736         struct at86rf230_local *lp = ctx->lp;
 737         u8 *buf = ctx->buf;
 738         int rc;
 739
 740         if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS)) {
 741                 u8 trac = TRAC_MASK(buf[1]);
 742
 743                 switch (trac) {
 744                 case TRAC_SUCCESS:
 745                         lp->trac.success++;
 746                         break;
 747                 case TRAC_SUCCESS_WAIT_FOR_ACK:
 748                         lp->trac.success_wait_for_ack++;
 749                         break;
 750                 case TRAC_INVALID:
 751                         lp->trac.invalid++;
 752                         break;
 753                 default:
 754                         WARN_ONCE(1, "received rx trac status %d\n", trac);
 755                         break;
 756                 }
 757         }
 758
 759         buf[0] = CMD_FB;
 760         ctx->trx.len = AT86RF2XX_MAX_BUF;
 761         ctx->msg.complete = at86rf230_rx_read_frame_complete;
 762         rc = spi_async(lp->spi, &ctx->msg);
 763         if (rc) {
 764                 ctx->trx.len = 2;
 765                 at86rf230_async_error(lp, ctx, rc);
 766         }
 767 }
 768
 769 static void
 770 at86rf230_irq_trx_end(void *context)
 771 {
 772         struct at86rf230_state_change *ctx = context;
 773         struct at86rf230_local *lp = ctx->lp;
 774
 775         if (lp->is_tx) {
 776                 lp->is_tx = 0;
 777                 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx,
 778                                          at86rf230_tx_trac_check);
 779         } else {
 780                 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx,
 781                                          at86rf230_rx_trac_check);
 782         }
 783 }
 784
 785 static void
 786 at86rf230_irq_status(void *context)
 787 {
 788         struct at86rf230_state_change *ctx = context;
 789         struct at86rf230_local *lp = ctx->lp;
 790         const u8 *buf = ctx->buf;
 791         u8 irq = buf[1];
 792
 793         enable_irq(lp->spi->irq);
 794
 795         if (irq & IRQ_TRX_END) {
 796                 at86rf230_irq_trx_end(ctx);
 797         } else {
 798                 dev_err(&lp->spi->dev, "not supported irq %02x received\n",
 799                         irq);
 800                 kfree(ctx);
 801         }
 802 }
 803
 804 static void
 805 at86rf230_setup_spi_messages(struct at86rf230_local *lp,
 806                              struct at86rf230_state_change *state)
 807 {
 808         state->lp = lp;
 809         state->irq = lp->spi->irq;
 810         spi_message_init(&state->msg);
 811         state->msg.context = state;
 812         state->trx.len = 2;
 813         state->trx.tx_buf = state->buf;
 814         state->trx.rx_buf = state->buf;
 815         spi_message_add_tail(&state->trx, &state->msg);
 816         hrtimer_init(&state->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 817         state->timer.function = at86rf230_async_state_timer;
 818 }
 819
 820 static irqreturn_t at86rf230_isr(int irq, void *data)
 821 {
 822         struct at86rf230_local *lp = data;
 823         struct at86rf230_state_change *ctx;
 824         int rc;
 825
 826         disable_irq_nosync(irq);
 827
 828         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
 829         if (!ctx) {
 830                 enable_irq(irq);
 831                 return IRQ_NONE;
 832         }
 833
 834         at86rf230_setup_spi_messages(lp, ctx);
 835         /* tell on error handling to free ctx */
 836         ctx->free = true;
 837
 838         ctx->buf[0] = (RG_IRQ_STATUS & CMD_REG_MASK) | CMD_REG;
 839         ctx->msg.complete = at86rf230_irq_status;
 840         rc = spi_async(lp->spi, &ctx->msg);
 841         if (rc) {
 842                 at86rf230_async_error(lp, ctx, rc);
 843                 enable_irq(irq);
 844                 return IRQ_NONE;
 845         }
 846
 847         return IRQ_HANDLED;
 848 }
 849
 850 static void
 851 at86rf230_write_frame_complete(void *context)
 852 {
 853         struct at86rf230_state_change *ctx = context;
 854         struct at86rf230_local *lp = ctx->lp;
 855
 856         ctx->trx.len = 2;
 857
 858         if (gpio_is_valid(lp->slp_tr))
 859                 at86rf230_slp_tr_rising_edge(lp);
 860         else
 861                 at86rf230_async_write_reg(lp, RG_TRX_STATE, STATE_BUSY_TX, ctx,
 862                                           NULL);
 863 }
 864
 865 static void
 866 at86rf230_write_frame(void *context)
 867 {
 868         struct at86rf230_state_change *ctx = context;
 869         struct at86rf230_local *lp = ctx->lp;
 870         struct sk_buff *skb = lp->tx_skb;
 871         u8 *buf = ctx->buf;
 872         int rc;
 873
 874         lp->is_tx = 1;
 875
 876         buf[0] = CMD_FB | CMD_WRITE;
 877         buf[1] = skb->len + 2;
 878         memcpy(buf + 2, skb->data, skb->len);
 879         ctx->trx.len = skb->len + 2;
 880         ctx->msg.complete = at86rf230_write_frame_complete;
 881         rc = spi_async(lp->spi, &ctx->msg);
 882         if (rc) {
 883                 ctx->trx.len = 2;
 884                 at86rf230_async_error(lp, ctx, rc);
 885         }
 886 }
 887
 888 static void
 889 at86rf230_xmit_tx_on(void *context)
 890 {
 891         struct at86rf230_state_change *ctx = context;
 892         struct at86rf230_local *lp = ctx->lp;
 893
 894         at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
 895                                      at86rf230_write_frame);
 896 }
 897
 898 static void
 899 at86rf230_xmit_start(void *context)
 900 {
 901         struct at86rf230_state_change *ctx = context;
 902         struct at86rf230_local *lp = ctx->lp;
 903
 904         /* check if we change from off state */
 905         if (lp->is_tx_from_off)
 906                 at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
 907                                              at86rf230_write_frame);
 908         else
 909                 at86rf230_async_state_change(lp, ctx, STATE_TX_ON,
 910                                              at86rf230_xmit_tx_on);
 911 }
 912
 913 static int
 914 at86rf230_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
 915 {
 916         struct at86rf230_local *lp = hw->priv;
 917         struct at86rf230_state_change *ctx = &lp->tx;
 918
 919         lp->tx_skb = skb;
 920         lp->tx_retry = 0;
 921
 922         /* After 5 minutes in PLL and the same frequency we run again the
 923          * calibration loops which is recommended by at86rf2xx datasheets.
 924          *
 925          * The calibration is initiate by a state change from TRX_OFF
 926          * to TX_ON, the lp->cal_timeout should be reinit by state_delay
 927          * function then to start in the next 5 minutes.
 928          */
 929         if (time_is_before_jiffies(lp->cal_timeout)) {
 930                 lp->is_tx_from_off = true;
 931                 at86rf230_async_state_change(lp, ctx, STATE_TRX_OFF,
 932                                              at86rf230_xmit_start);
 933         } else {
 934                 lp->is_tx_from_off = false;
 935                 at86rf230_xmit_start(ctx);
 936         }
 937
 938         return 0;
 939 }
 940
 941 static int
 942 at86rf230_ed(struct ieee802154_hw *hw, u8 *level)
 943 {
 944         BUG_ON(!level);
 945         *level = 0xbe;
 946         return 0;
 947 }
 948
 949 static int
 950 at86rf230_start(struct ieee802154_hw *hw)
 951 {
 952         struct at86rf230_local *lp = hw->priv;
 953
 954         /* reset trac stats on start */
 955         if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS))
 956                 memset(&lp->trac, 0, sizeof(struct at86rf230_trac));
 957
 958         at86rf230_awake(lp);
 959         enable_irq(lp->spi->irq);
 960
 961         return at86rf230_sync_state_change(lp, STATE_RX_AACK_ON);
 962 }
 963
 964 static void
 965 at86rf230_stop(struct ieee802154_hw *hw)
 966 {
 967         struct at86rf230_local *lp = hw->priv;
 968         u8 csma_seed[2];
 969
 970         at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
 971
 972         disable_irq(lp->spi->irq);
 973
 974         /* It's recommended to set random new csma_seeds before sleep state.
 975          * Makes only sense in the stop callback, not doing this inside of
 976          * at86rf230_sleep, this is also used when we don't transmit afterwards
 977          * when calling start callback again.
 978          */
 979         get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
 980         at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
 981         at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
 982
 983         at86rf230_sleep(lp);
 984 }
 985
 986 static int
 987 at86rf23x_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
 988 {
 989         return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
 990 }
 991
 992 #define AT86RF2XX_MAX_ED_LEVELS 0xF
 993 static const s32 at86rf23x_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = {
 994         -9100, -8900, -8700, -8500, -8300, -8100, -7900, -7700, -7500, -7300,
 995         -7100, -6900, -6700, -6500, -6300, -6100,
 996 };
 997
 998 static const s32 at86rf212_ed_levels_100[AT86RF2XX_MAX_ED_LEVELS + 1] = {
 999         -10000, -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200,
1000         -8000, -7800, -7600, -7400, -7200, -7000,
1001 };
1002
1003 static const s32 at86rf212_ed_levels_98[AT86RF2XX_MAX_ED_LEVELS + 1] = {
1004         -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000,
1005         -7800, -7600, -7400, -7200, -7000, -6800,
1006 };
1007
1008 static inline int
1009 at86rf212_update_cca_ed_level(struct at86rf230_local *lp, int rssi_base_val)
1010 {
1011         unsigned int cca_ed_thres;
1012         int rc;
1013
1014         rc = at86rf230_read_subreg(lp, SR_CCA_ED_THRES, &cca_ed_thres);
1015         if (rc < 0)
1016                 return rc;
1017
1018         switch (rssi_base_val) {
1019         case -98:
1020                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_98;
1021                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_98);
1022                 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_98[cca_ed_thres];
1023                 break;
1024         case -100:
1025                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
1026                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
1027                 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_100[cca_ed_thres];
1028                 break;
1029         default:
1030                 WARN_ON(1);
1031         }
1032
1033         return 0;
1034 }
1035
1036 static int
1037 at86rf212_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
1038 {
1039         int rc;
1040
1041         if (channel == 0)
1042                 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 0);
1043         else
1044                 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 1);
1045         if (rc < 0)
1046                 return rc;
1047
1048         if (page == 0) {
1049                 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 0);
1050                 lp->data->rssi_base_val = -100;
1051         } else {
1052                 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 1);
1053                 lp->data->rssi_base_val = -98;
1054         }
1055         if (rc < 0)
1056                 return rc;
1057
1058         rc = at86rf212_update_cca_ed_level(lp, lp->data->rssi_base_val);
1059         if (rc < 0)
1060                 return rc;
1061
1062         /* This sets the symbol_duration according frequency on the 212.
1063          * TODO move this handling while set channel and page in cfg802154.
1064          * We can do that, this timings are according 802.15.4 standard.
1065          * If we do that in cfg802154, this is a more generic calculation.
1066          *
1067          * This should also protected from ifs_timer. Means cancel timer and
1068          * init with a new value. For now, this is okay.
1069          */
1070         if (channel == 0) {
1071                 if (page == 0) {
1072                         /* SUB:0 and BPSK:0 -> BPSK-20 */
1073                         lp->hw->phy->symbol_duration = 50;
1074                 } else {
1075                         /* SUB:1 and BPSK:0 -> BPSK-40 */
1076                         lp->hw->phy->symbol_duration = 25;
1077                 }
1078         } else {
1079                 if (page == 0)
1080                         /* SUB:0 and BPSK:1 -> OQPSK-100/200/400 */
1081                         lp->hw->phy->symbol_duration = 40;
1082                 else
1083                         /* SUB:1 and BPSK:1 -> OQPSK-250/500/1000 */
1084                         lp->hw->phy->symbol_duration = 16;
1085         }
1086
1087         lp->hw->phy->lifs_period = IEEE802154_LIFS_PERIOD *
1088                                    lp->hw->phy->symbol_duration;
1089         lp->hw->phy->sifs_period = IEEE802154_SIFS_PERIOD *
1090                                    lp->hw->phy->symbol_duration;
1091
1092         return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
1093 }
1094
1095 static int
1096 at86rf230_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
1097 {
1098         struct at86rf230_local *lp = hw->priv;
1099         int rc;
1100
1101         rc = lp->data->set_channel(lp, page, channel);
1102         /* Wait for PLL */
1103         usleep_range(lp->data->t_channel_switch,
1104                      lp->data->t_channel_switch + 10);
1105
1106         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
1107         return rc;
1108 }
1109
1110 static int
1111 at86rf230_set_hw_addr_filt(struct ieee802154_hw *hw,
1112                            struct ieee802154_hw_addr_filt *filt,
1113                            unsigned long changed)
1114 {
1115         struct at86rf230_local *lp = hw->priv;
1116
1117         if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
1118                 u16 addr = le16_to_cpu(filt->short_addr);
1119
1120                 dev_vdbg(&lp->spi->dev,
1121                          "at86rf230_set_hw_addr_filt called for saddr\n");
1122                 __at86rf230_write(lp, RG_SHORT_ADDR_0, addr);
1123                 __at86rf230_write(lp, RG_SHORT_ADDR_1, addr >> 8);
1124         }
1125
1126         if (changed & IEEE802154_AFILT_PANID_CHANGED) {
1127                 u16 pan = le16_to_cpu(filt->pan_id);
1128
1129                 dev_vdbg(&lp->spi->dev,
1130                          "at86rf230_set_hw_addr_filt called for pan id\n");
1131                 __at86rf230_write(lp, RG_PAN_ID_0, pan);
1132                 __at86rf230_write(lp, RG_PAN_ID_1, pan >> 8);
1133         }
1134
1135         if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
1136                 u8 i, addr[8];
1137
1138                 memcpy(addr, &filt->ieee_addr, 8);
1139                 dev_vdbg(&lp->spi->dev,
1140                          "at86rf230_set_hw_addr_filt called for IEEE addr\n");
1141                 for (i = 0; i < 8; i++)
1142                         __at86rf230_write(lp, RG_IEEE_ADDR_0 + i, addr[i]);
1143         }
1144
1145         if (changed & IEEE802154_AFILT_PANC_CHANGED) {
1146                 dev_vdbg(&lp->spi->dev,
1147                          "at86rf230_set_hw_addr_filt called for panc change\n");
1148                 if (filt->pan_coord)
1149                         at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 1);
1150                 else
1151                         at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 0);
1152         }
1153
1154         return 0;
1155 }
1156
1157 #define AT86RF23X_MAX_TX_POWERS 0xF
1158 static const s32 at86rf233_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1159         400, 370, 340, 300, 250, 200, 100, 0, -100, -200, -300, -400, -600,
1160         -800, -1200, -1700,
1161 };
1162
1163 static const s32 at86rf231_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1164         300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700,
1165         -900, -1200, -1700,
1166 };
1167
1168 #define AT86RF212_MAX_TX_POWERS 0x1F
1169 static const s32 at86rf212_powers[AT86RF212_MAX_TX_POWERS + 1] = {
1170         500, 400, 300, 200, 100, 0, -100, -200, -300, -400, -500, -600, -700,
1171         -800, -900, -1000, -1100, -1200, -1300, -1400, -1500, -1600, -1700,
1172         -1800, -1900, -2000, -2100, -2200, -2300, -2400, -2500, -2600,
1173 };
1174
1175 static int
1176 at86rf23x_set_txpower(struct at86rf230_local *lp, s32 mbm)
1177 {
1178         u32 i;
1179
1180         for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1181                 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1182                         return at86rf230_write_subreg(lp, SR_TX_PWR_23X, i);
1183         }
1184
1185         return -EINVAL;
1186 }
1187
1188 static int
1189 at86rf212_set_txpower(struct at86rf230_local *lp, s32 mbm)
1190 {
1191         u32 i;
1192
1193         for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1194                 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1195                         return at86rf230_write_subreg(lp, SR_TX_PWR_212, i);
1196         }
1197
1198         return -EINVAL;
1199 }
1200
1201 static int
1202 at86rf230_set_txpower(struct ieee802154_hw *hw, s32 mbm)
1203 {
1204         struct at86rf230_local *lp = hw->priv;
1205
1206         return lp->data->set_txpower(lp, mbm);
1207 }
1208
1209 static int
1210 at86rf230_set_lbt(struct ieee802154_hw *hw, bool on)
1211 {
1212         struct at86rf230_local *lp = hw->priv;
1213
1214         return at86rf230_write_subreg(lp, SR_CSMA_LBT_MODE, on);
1215 }
1216
1217 static int
1218 at86rf230_set_cca_mode(struct ieee802154_hw *hw,
1219                        const struct wpan_phy_cca *cca)
1220 {
1221         struct at86rf230_local *lp = hw->priv;
1222         u8 val;
1223
1224         /* mapping 802.15.4 to driver spec */
1225         switch (cca->mode) {
1226         case NL802154_CCA_ENERGY:
1227                 val = 1;
1228                 break;
1229         case NL802154_CCA_CARRIER:
1230                 val = 2;
1231                 break;
1232         case NL802154_CCA_ENERGY_CARRIER:
1233                 switch (cca->opt) {
1234                 case NL802154_CCA_OPT_ENERGY_CARRIER_AND:
1235                         val = 3;
1236                         break;
1237                 case NL802154_CCA_OPT_ENERGY_CARRIER_OR:
1238                         val = 0;
1239                         break;
1240                 default:
1241                         return -EINVAL;
1242                 }
1243                 break;
1244         default:
1245                 return -EINVAL;
1246         }
1247
1248         return at86rf230_write_subreg(lp, SR_CCA_MODE, val);
1249 }
1250
1251
1252 static int
1253 at86rf230_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
1254 {
1255         struct at86rf230_local *lp = hw->priv;
1256         u32 i;
1257
1258         for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) {
1259                 if (hw->phy->supported.cca_ed_levels[i] == mbm)
1260                         return at86rf230_write_subreg(lp, SR_CCA_ED_THRES, i);
1261         }
1262
1263         return -EINVAL;
1264 }
1265
1266 static int
1267 at86rf230_set_csma_params(struct ieee802154_hw *hw, u8 min_be, u8 max_be,
1268                           u8 retries)
1269 {
1270         struct at86rf230_local *lp = hw->priv;
1271         int rc;
1272
1273         rc = at86rf230_write_subreg(lp, SR_MIN_BE, min_be);
1274         if (rc)
1275                 return rc;
1276
1277         rc = at86rf230_write_subreg(lp, SR_MAX_BE, max_be);
1278         if (rc)
1279                 return rc;
1280
1281         return at86rf230_write_subreg(lp, SR_MAX_CSMA_RETRIES, retries);
1282 }
1283
1284 static int
1285 at86rf230_set_frame_retries(struct ieee802154_hw *hw, s8 retries)
1286 {
1287         struct at86rf230_local *lp = hw->priv;
1288
1289         return at86rf230_write_subreg(lp, SR_MAX_FRAME_RETRIES, retries);
1290 }
1291
1292 static int
1293 at86rf230_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
1294 {
1295         struct at86rf230_local *lp = hw->priv;
1296         int rc;
1297
1298         if (on) {
1299                 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 1);
1300                 if (rc < 0)
1301                         return rc;
1302
1303                 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 1);
1304                 if (rc < 0)
1305                         return rc;
1306         } else {
1307                 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 0);
1308                 if (rc < 0)
1309                         return rc;
1310
1311                 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 0);
1312                 if (rc < 0)
1313                         return rc;
1314         }
1315
1316         return 0;
1317 }
1318
1319 static const struct ieee802154_ops at86rf230_ops = {
1320         .owner = THIS_MODULE,
1321         .xmit_async = at86rf230_xmit,
1322         .ed = at86rf230_ed,
1323         .set_channel = at86rf230_channel,
1324         .start = at86rf230_start,
1325         .stop = at86rf230_stop,
1326         .set_hw_addr_filt = at86rf230_set_hw_addr_filt,
1327         .set_txpower = at86rf230_set_txpower,
1328         .set_lbt = at86rf230_set_lbt,
1329         .set_cca_mode = at86rf230_set_cca_mode,
1330         .set_cca_ed_level = at86rf230_set_cca_ed_level,
1331         .set_csma_params = at86rf230_set_csma_params,
1332         .set_frame_retries = at86rf230_set_frame_retries,
1333         .set_promiscuous_mode = at86rf230_set_promiscuous_mode,
1334 };
1335
1336 static struct at86rf2xx_chip_data at86rf233_data = {
1337         .t_sleep_cycle = 330,
1338         .t_channel_switch = 11,
1339         .t_reset_to_off = 26,
1340         .t_off_to_aack = 80,
1341         .t_off_to_tx_on = 80,
1342         .t_off_to_sleep = 35,
1343         .t_sleep_to_off = 1000,
1344         .t_frame = 4096,
1345         .t_p_ack = 545,
1346         .rssi_base_val = -91,
1347         .set_channel = at86rf23x_set_channel,
1348         .set_txpower = at86rf23x_set_txpower,
1349 };
1350
1351 static struct at86rf2xx_chip_data at86rf231_data = {
1352         .t_sleep_cycle = 330,
1353         .t_channel_switch = 24,
1354         .t_reset_to_off = 37,
1355         .t_off_to_aack = 110,
1356         .t_off_to_tx_on = 110,
1357         .t_off_to_sleep = 35,
1358         .t_sleep_to_off = 1000,
1359         .t_frame = 4096,
1360         .t_p_ack = 545,
1361         .rssi_base_val = -91,
1362         .set_channel = at86rf23x_set_channel,
1363         .set_txpower = at86rf23x_set_txpower,
1364 };
1365
1366 static struct at86rf2xx_chip_data at86rf212_data = {
1367         .t_sleep_cycle = 330,
1368         .t_channel_switch = 11,
1369         .t_reset_to_off = 26,
1370         .t_off_to_aack = 200,
1371         .t_off_to_tx_on = 200,
1372         .t_off_to_sleep = 35,
1373         .t_sleep_to_off = 1000,
1374         .t_frame = 4096,
1375         .t_p_ack = 545,
1376         .rssi_base_val = -100,
1377         .set_channel = at86rf212_set_channel,
1378         .set_txpower = at86rf212_set_txpower,
1379 };
1380
1381 static int at86rf230_hw_init(struct at86rf230_local *lp, u8 xtal_trim)
1382 {
1383         int rc, irq_type, irq_pol = IRQ_ACTIVE_HIGH;
1384         unsigned int dvdd;
1385         u8 csma_seed[2];
1386
1387         rc = at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
1388         if (rc)
1389                 return rc;
1390
1391         irq_type = irq_get_trigger_type(lp->spi->irq);
1392         if (irq_type == IRQ_TYPE_EDGE_FALLING ||
1393             irq_type == IRQ_TYPE_LEVEL_LOW)
1394                 irq_pol = IRQ_ACTIVE_LOW;
1395
1396         rc = at86rf230_write_subreg(lp, SR_IRQ_POLARITY, irq_pol);
1397         if (rc)
1398                 return rc;
1399
1400         rc = at86rf230_write_subreg(lp, SR_RX_SAFE_MODE, 1);
1401         if (rc)
1402                 return rc;
1403
1404         rc = at86rf230_write_subreg(lp, SR_IRQ_MASK, IRQ_TRX_END);
1405         if (rc)
1406                 return rc;
1407
1408         /* reset values differs in at86rf231 and at86rf233 */
1409         rc = at86rf230_write_subreg(lp, SR_IRQ_MASK_MODE, 0);
1410         if (rc)
1411                 return rc;
1412
1413         get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
1414         rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
1415         if (rc)
1416                 return rc;
1417         rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
1418         if (rc)
1419                 return rc;
1420
1421         /* CLKM changes are applied immediately */
1422         rc = at86rf230_write_subreg(lp, SR_CLKM_SHA_SEL, 0x00);
1423         if (rc)
1424                 return rc;
1425
1426         /* Turn CLKM Off */
1427         rc = at86rf230_write_subreg(lp, SR_CLKM_CTRL, 0x00);
1428         if (rc)
1429                 return rc;
1430         /* Wait the next SLEEP cycle */
1431         usleep_range(lp->data->t_sleep_cycle,
1432                      lp->data->t_sleep_cycle + 100);
1433
1434         /* xtal_trim value is calculated by:
1435          * CL = 0.5 * (CX + CTRIM + CPAR)
1436          *
1437          * whereas:
1438          * CL = capacitor of used crystal
1439          * CX = connected capacitors at xtal pins
1440          * CPAR = in all at86rf2xx datasheets this is a constant value 3 pF,
1441          *        but this is different on each board setup. You need to fine
1442          *        tuning this value via CTRIM.
1443          * CTRIM = variable capacitor setting. Resolution is 0.3 pF range is
1444          *         0 pF upto 4.5 pF.
1445          *
1446          * Examples:
1447          * atben transceiver:
1448          *
1449          * CL = 8 pF
1450          * CX = 12 pF
1451          * CPAR = 3 pF (We assume the magic constant from datasheet)
1452          * CTRIM = 0.9 pF
1453          *
1454          * (12+0.9+3)/2 = 7.95 which is nearly at 8 pF
1455          *
1456          * xtal_trim = 0x3
1457          *
1458          * openlabs transceiver:
1459          *
1460          * CL = 16 pF
1461          * CX = 22 pF
1462          * CPAR = 3 pF (We assume the magic constant from datasheet)
1463          * CTRIM = 4.5 pF
1464          *
1465          * (22+4.5+3)/2 = 14.75 which is the nearest value to 16 pF
1466          *
1467          * xtal_trim = 0xf
1468          */
1469         rc = at86rf230_write_subreg(lp, SR_XTAL_TRIM, xtal_trim);
1470         if (rc)
1471                 return rc;
1472
1473         rc = at86rf230_read_subreg(lp, SR_DVDD_OK, &dvdd);
1474         if (rc)
1475                 return rc;
1476         if (!dvdd) {
1477                 dev_err(&lp->spi->dev, "DVDD error\n");
1478                 return -EINVAL;
1479         }
1480
1481         /* Force setting slotted operation bit to 0. Sometimes the atben
1482          * sets this bit and I don't know why. We set this always force
1483          * to zero while probing.
1484          */
1485         return at86rf230_write_subreg(lp, SR_SLOTTED_OPERATION, 0);
1486 }
1487
1488 static int
1489 at86rf230_get_pdata(struct spi_device *spi, int *rstn, int *slp_tr,
1490                     u8 *xtal_trim)
1491 {
1492         struct at86rf230_platform_data *pdata = spi->dev.platform_data;
1493         int ret;
1494
1495         if (!IS_ENABLED(CONFIG_OF) || !spi->dev.of_node) {
1496                 if (!pdata)
1497                         return -ENOENT;
1498
1499                 *rstn = pdata->rstn;
1500                 *slp_tr = pdata->slp_tr;
1501                 *xtal_trim = pdata->xtal_trim;
1502                 return 0;
1503         }
1504
1505         *rstn = of_get_named_gpio(spi->dev.of_node, "reset-gpio", 0);
1506         *slp_tr = of_get_named_gpio(spi->dev.of_node, "sleep-gpio", 0);
1507         ret = of_property_read_u8(spi->dev.of_node, "xtal-trim", xtal_trim);
1508         if (ret < 0 && ret != -EINVAL)
1509                 return ret;
1510
1511         return 0;
1512 }
1513
1514 static int
1515 at86rf230_detect_device(struct at86rf230_local *lp)
1516 {
1517         unsigned int part, version, val;
1518         u16 man_id = 0;
1519         const char *chip;
1520         int rc;
1521
1522         rc = __at86rf230_read(lp, RG_MAN_ID_0, &val);
1523         if (rc)
1524                 return rc;
1525         man_id |= val;
1526
1527         rc = __at86rf230_read(lp, RG_MAN_ID_1, &val);
1528         if (rc)
1529                 return rc;
1530         man_id |= (val << 8);
1531
1532         rc = __at86rf230_read(lp, RG_PART_NUM, &part);
1533         if (rc)
1534                 return rc;
1535
1536         rc = __at86rf230_read(lp, RG_VERSION_NUM, &version);
1537         if (rc)
1538                 return rc;
1539
1540         if (man_id != 0x001f) {
1541                 dev_err(&lp->spi->dev, "Non-Atmel dev found (MAN_ID %02x %02x)\n",
1542                         man_id >> 8, man_id & 0xFF);
1543                 return -EINVAL;
1544         }
1545
1546         lp->hw->flags = IEEE802154_HW_TX_OMIT_CKSUM |
1547                         IEEE802154_HW_CSMA_PARAMS |
1548                         IEEE802154_HW_FRAME_RETRIES | IEEE802154_HW_AFILT |
1549                         IEEE802154_HW_PROMISCUOUS;
1550
1551         lp->hw->phy->flags = WPAN_PHY_FLAG_TXPOWER |
1552                              WPAN_PHY_FLAG_CCA_ED_LEVEL |
1553                              WPAN_PHY_FLAG_CCA_MODE;
1554
1555         lp->hw->phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY) |
1556                 BIT(NL802154_CCA_CARRIER) | BIT(NL802154_CCA_ENERGY_CARRIER);
1557         lp->hw->phy->supported.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND) |
1558                 BIT(NL802154_CCA_OPT_ENERGY_CARRIER_OR);
1559
1560         lp->hw->phy->supported.cca_ed_levels = at86rf23x_ed_levels;
1561         lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf23x_ed_levels);
1562
1563         lp->hw->phy->cca.mode = NL802154_CCA_ENERGY;
1564
1565         switch (part) {
1566         case 2:
1567                 chip = "at86rf230";
1568                 rc = -ENOTSUPP;
1569                 goto not_supp;
1570         case 3:
1571                 chip = "at86rf231";
1572                 lp->data = &at86rf231_data;
1573                 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1574                 lp->hw->phy->current_channel = 11;
1575                 lp->hw->phy->symbol_duration = 16;
1576                 lp->hw->phy->supported.tx_powers = at86rf231_powers;
1577                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf231_powers);
1578                 break;
1579         case 7:
1580                 chip = "at86rf212";
1581                 lp->data = &at86rf212_data;
1582                 lp->hw->flags |= IEEE802154_HW_LBT;
1583                 lp->hw->phy->supported.channels[0] = 0x00007FF;
1584                 lp->hw->phy->supported.channels[2] = 0x00007FF;
1585                 lp->hw->phy->current_channel = 5;
1586                 lp->hw->phy->symbol_duration = 25;
1587                 lp->hw->phy->supported.lbt = NL802154_SUPPORTED_BOOL_BOTH;
1588                 lp->hw->phy->supported.tx_powers = at86rf212_powers;
1589                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf212_powers);
1590                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
1591                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
1592                 break;
1593         case 11:
1594                 chip = "at86rf233";
1595                 lp->data = &at86rf233_data;
1596                 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1597                 lp->hw->phy->current_channel = 13;
1598                 lp->hw->phy->symbol_duration = 16;
1599                 lp->hw->phy->supported.tx_powers = at86rf233_powers;
1600                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf233_powers);
1601                 break;
1602         default:
1603                 chip = "unknown";
1604                 rc = -ENOTSUPP;
1605                 goto not_supp;
1606         }
1607
1608         lp->hw->phy->cca_ed_level = lp->hw->phy->supported.cca_ed_levels[7];
1609         lp->hw->phy->transmit_power = lp->hw->phy->supported.tx_powers[0];
1610
1611 not_supp:
1612         dev_info(&lp->spi->dev, "Detected %s chip version %d\n", chip, version);
1613
1614         return rc;
1615 }
1616
1617 #ifdef CONFIG_IEEE802154_AT86RF230_DEBUGFS
1618 static struct dentry *at86rf230_debugfs_root;
1619
1620 static int at86rf230_stats_show(struct seq_file *file, void *offset)
1621 {
1622         struct at86rf230_local *lp = file->private;
1623
1624         seq_printf(file, "SUCCESS:\t\t%8llu\n", lp->trac.success);
1625         seq_printf(file, "SUCCESS_DATA_PENDING:\t%8llu\n",
1626                    lp->trac.success_data_pending);
1627         seq_printf(file, "SUCCESS_WAIT_FOR_ACK:\t%8llu\n",
1628                    lp->trac.success_wait_for_ack);
1629         seq_printf(file, "CHANNEL_ACCESS_FAILURE:\t%8llu\n",
1630                    lp->trac.channel_access_failure);
1631         seq_printf(file, "NO_ACK:\t\t\t%8llu\n", lp->trac.no_ack);
1632         seq_printf(file, "INVALID:\t\t%8llu\n", lp->trac.invalid);
1633         return 0;
1634 }
1635
1636 static int at86rf230_stats_open(struct inode *inode, struct file *file)
1637 {
1638         return single_open(file, at86rf230_stats_show, inode->i_private);
1639 }
1640
1641 static const struct file_operations at86rf230_stats_fops = {
1642         .open           = at86rf230_stats_open,
1643         .read           = seq_read,
1644         .llseek         = seq_lseek,
1645         .release        = single_release,
1646 };
1647
1648 static int at86rf230_debugfs_init(struct at86rf230_local *lp)
1649 {
1650         char debugfs_dir_name[DNAME_INLINE_LEN + 1] = "at86rf230-";
1651         struct dentry *stats;
1652
1653         strncat(debugfs_dir_name, dev_name(&lp->spi->dev), DNAME_INLINE_LEN);
1654
1655         at86rf230_debugfs_root = debugfs_create_dir(debugfs_dir_name, NULL);
1656         if (!at86rf230_debugfs_root)
1657                 return -ENOMEM;
1658
1659         stats = debugfs_create_file("trac_stats", S_IRUGO,
1660                                     at86rf230_debugfs_root, lp,
1661                                     &at86rf230_stats_fops);
1662         if (!stats)
1663                 return -ENOMEM;
1664
1665         return 0;
1666 }
1667
1668 static void at86rf230_debugfs_remove(void)
1669 {
1670         debugfs_remove_recursive(at86rf230_debugfs_root);
1671 }
1672 #else
1673 static int at86rf230_debugfs_init(struct at86rf230_local *lp) { return 0; }
1674 static void at86rf230_debugfs_remove(void) { }
1675 #endif
1676
1677 static int at86rf230_probe(struct spi_device *spi)
1678 {
1679         struct ieee802154_hw *hw;
1680         struct at86rf230_local *lp;
1681         unsigned int status;
1682         int rc, irq_type, rstn, slp_tr;
1683         u8 xtal_trim = 0;
1684
1685         if (!spi->irq) {
1686                 dev_err(&spi->dev, "no IRQ specified\n");
1687                 return -EINVAL;
1688         }
1689
1690         rc = at86rf230_get_pdata(spi, &rstn, &slp_tr, &xtal_trim);
1691         if (rc < 0) {
1692                 dev_err(&spi->dev, "failed to parse platform_data: %d\n", rc);
1693                 return rc;
1694         }
1695
1696         if (gpio_is_valid(rstn)) {
1697                 rc = devm_gpio_request_one(&spi->dev, rstn,
1698                                            GPIOF_OUT_INIT_HIGH, "rstn");
1699                 if (rc)
1700                         return rc;
1701         }
1702
1703         if (gpio_is_valid(slp_tr)) {
1704                 rc = devm_gpio_request_one(&spi->dev, slp_tr,
1705                                            GPIOF_OUT_INIT_LOW, "slp_tr");
1706                 if (rc)
1707                         return rc;
1708         }
1709
1710         /* Reset */
1711         if (gpio_is_valid(rstn)) {
1712                 udelay(1);
1713                 gpio_set_value(rstn, 0);
1714                 udelay(1);
1715                 gpio_set_value(rstn, 1);
1716                 usleep_range(120, 240);
1717         }
1718
1719         hw = ieee802154_alloc_hw(sizeof(*lp), &at86rf230_ops);
1720         if (!hw)
1721                 return -ENOMEM;
1722
1723         lp = hw->priv;
1724         lp->hw = hw;
1725         lp->spi = spi;
1726         lp->slp_tr = slp_tr;
1727         hw->parent = &spi->dev;
1728         ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
1729
1730         lp->regmap = devm_regmap_init_spi(spi, &at86rf230_regmap_spi_config);
1731         if (IS_ERR(lp->regmap)) {
1732                 rc = PTR_ERR(lp->regmap);
1733                 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
1734                         rc);
1735                 goto free_dev;
1736         }
1737
1738         at86rf230_setup_spi_messages(lp, &lp->state);
1739         at86rf230_setup_spi_messages(lp, &lp->tx);
1740
1741         rc = at86rf230_detect_device(lp);
1742         if (rc < 0)
1743                 goto free_dev;
1744
1745         init_completion(&lp->state_complete);
1746
1747         spi_set_drvdata(spi, lp);
1748
1749         rc = at86rf230_hw_init(lp, xtal_trim);
1750         if (rc)
1751                 goto free_dev;
1752
1753         /* Read irq status register to reset irq line */
1754         rc = at86rf230_read_subreg(lp, RG_IRQ_STATUS, 0xff, 0, &status);
1755         if (rc)
1756                 goto free_dev;
1757
1758         irq_type = irq_get_trigger_type(spi->irq);
1759         if (!irq_type)
1760                 irq_type = IRQF_TRIGGER_HIGH;
1761
1762         rc = devm_request_irq(&spi->dev, spi->irq, at86rf230_isr,
1763                               IRQF_SHARED | irq_type, dev_name(&spi->dev), lp);
1764         if (rc)
1765                 goto free_dev;
1766
1767         /* disable_irq by default and wait for starting hardware */
1768         disable_irq(spi->irq);
1769
1770         /* going into sleep by default */
1771         at86rf230_sleep(lp);
1772
1773         rc = at86rf230_debugfs_init(lp);
1774         if (rc)
1775                 goto free_dev;
1776
1777         rc = ieee802154_register_hw(lp->hw);
1778         if (rc)
1779                 goto free_debugfs;
1780
1781         return rc;
1782
1783 free_debugfs:
1784         at86rf230_debugfs_remove();
1785 free_dev:
1786         ieee802154_free_hw(lp->hw);
1787
1788         return rc;
1789 }
1790
1791 static int at86rf230_remove(struct spi_device *spi)
1792 {
1793         struct at86rf230_local *lp = spi_get_drvdata(spi);
1794
1795         /* mask all at86rf230 irq's */
1796         at86rf230_write_subreg(lp, SR_IRQ_MASK, 0);
1797         ieee802154_unregister_hw(lp->hw);
1798         ieee802154_free_hw(lp->hw);
1799         at86rf230_debugfs_remove();
1800         dev_dbg(&spi->dev, "unregistered at86rf230\n");
1801
1802         return 0;
1803 }
1804
1805 static const struct of_device_id at86rf230_of_match[] = {
1806         { .compatible = "atmel,at86rf230", },
1807         { .compatible = "atmel,at86rf231", },
1808         { .compatible = "atmel,at86rf233", },
1809         { .compatible = "atmel,at86rf212", },
1810         { },
1811 };
1812 MODULE_DEVICE_TABLE(of, at86rf230_of_match);
1813
1814 static const struct spi_device_id at86rf230_device_id[] = {
1815         { .name = "at86rf230", },
1816         { .name = "at86rf231", },
1817         { .name = "at86rf233", },
1818         { .name = "at86rf212", },
1819         { },
1820 };
1821 MODULE_DEVICE_TABLE(spi, at86rf230_device_id);
1822
1823 static struct spi_driver at86rf230_driver = {
1824         .id_table = at86rf230_device_id,
1825         .driver = {
1826                 .of_match_table = of_match_ptr(at86rf230_of_match),
1827                 .name   = "at86rf230",
1828         },
1829         .probe      = at86rf230_probe,
1830         .remove     = at86rf230_remove,
1831 };
1832
1833 module_spi_driver(at86rf230_driver);
1834
1835 MODULE_DESCRIPTION("AT86RF230 Transceiver Driver");
1836 MODULE_LICENSE("GPL v2");