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
  35 #include <net/mac802154.h>
  36 #include <net/cfg802154.h>
  37
  38 #include "at86rf230.h"
  39
  40 struct at86rf230_local;
  41 /* at86rf2xx chip depend data.
  42  * All timings are in us.
  43  */
  44 struct at86rf2xx_chip_data {
  45         u16 t_sleep_cycle;
  46         u16 t_channel_switch;
  47         u16 t_reset_to_off;
  48         u16 t_off_to_aack;
  49         u16 t_off_to_tx_on;
  50         u16 t_off_to_sleep;
  51         u16 t_sleep_to_off;
  52         u16 t_frame;
  53         u16 t_p_ack;
  54         int rssi_base_val;
  55
  56         int (*set_channel)(struct at86rf230_local *, u8, u8);
  57         int (*set_txpower)(struct at86rf230_local *, s32);
  58 };
  59
  60 #define AT86RF2XX_MAX_BUF               (127 + 3)
  61 /* tx retries to access the TX_ON state
  62  * if it's above then force change will be started.
  63  *
  64  * We assume the max_frame_retries (7) value of 802.15.4 here.
  65  */
  66 #define AT86RF2XX_MAX_TX_RETRIES        7
  67 /* We use the recommended 5 minutes timeout to recalibrate */
  68 #define AT86RF2XX_CAL_LOOP_TIMEOUT      (5 * 60 * HZ)
  69
  70 struct at86rf230_state_change {
  71         struct at86rf230_local *lp;
  72         int irq;
  73
  74         struct hrtimer timer;
  75         struct spi_message msg;
  76         struct spi_transfer trx;
  77         u8 buf[AT86RF2XX_MAX_BUF];
  78
  79         void (*complete)(void *context);
  80         u8 from_state;
  81         u8 to_state;
  82
  83         bool irq_enable;
  84 };
  85
  86 struct at86rf230_local {
  87         struct spi_device *spi;
  88
  89         struct ieee802154_hw *hw;
  90         struct at86rf2xx_chip_data *data;
  91         struct regmap *regmap;
  92         int slp_tr;
  93         bool sleep;
  94
  95         struct completion state_complete;
  96         struct at86rf230_state_change state;
  97
  98         struct at86rf230_state_change irq;
  99
 100         unsigned long cal_timeout;
 101         bool is_tx;
 102         bool is_tx_from_off;
 103         u8 tx_retry;
 104         struct sk_buff *tx_skb;
 105         struct at86rf230_state_change tx;
 106 };
 107
 108 #define AT86RF2XX_NUMREGS 0x3F
 109
 110 static void
 111 at86rf230_async_state_change(struct at86rf230_local *lp,
 112                              struct at86rf230_state_change *ctx,
 113                              const u8 state, void (*complete)(void *context),
 114                              const bool irq_enable);
 115
 116 static inline void
 117 at86rf230_sleep(struct at86rf230_local *lp)
 118 {
 119         if (gpio_is_valid(lp->slp_tr)) {
 120                 gpio_set_value(lp->slp_tr, 1);
 121                 usleep_range(lp->data->t_off_to_sleep,
 122                              lp->data->t_off_to_sleep + 10);
 123                 lp->sleep = true;
 124         }
 125 }
 126
 127 static inline void
 128 at86rf230_awake(struct at86rf230_local *lp)
 129 {
 130         if (gpio_is_valid(lp->slp_tr)) {
 131                 gpio_set_value(lp->slp_tr, 0);
 132                 usleep_range(lp->data->t_sleep_to_off,
 133                              lp->data->t_sleep_to_off + 100);
 134                 lp->sleep = false;
 135         }
 136 }
 137
 138 static inline int
 139 __at86rf230_write(struct at86rf230_local *lp,
 140                   unsigned int addr, unsigned int data)
 141 {
 142         bool sleep = lp->sleep;
 143         int ret;
 144
 145         /* awake for register setting if sleep */
 146         if (sleep)
 147                 at86rf230_awake(lp);
 148
 149         ret = regmap_write(lp->regmap, addr, data);
 150
 151         /* sleep again if was sleeping */
 152         if (sleep)
 153                 at86rf230_sleep(lp);
 154
 155         return ret;
 156 }
 157
 158 static inline int
 159 __at86rf230_read(struct at86rf230_local *lp,
 160                  unsigned int addr, unsigned int *data)
 161 {
 162         bool sleep = lp->sleep;
 163         int ret;
 164
 165         /* awake for register setting if sleep */
 166         if (sleep)
 167                 at86rf230_awake(lp);
 168
 169         ret = regmap_read(lp->regmap, addr, data);
 170
 171         /* sleep again if was sleeping */
 172         if (sleep)
 173                 at86rf230_sleep(lp);
 174
 175         return ret;
 176 }
 177
 178 static inline int
 179 at86rf230_read_subreg(struct at86rf230_local *lp,
 180                       unsigned int addr, unsigned int mask,
 181                       unsigned int shift, unsigned int *data)
 182 {
 183         int rc;
 184
 185         rc = __at86rf230_read(lp, addr, data);
 186         if (!rc)
 187                 *data = (*data & mask) >> shift;
 188
 189         return rc;
 190 }
 191
 192 static inline int
 193 at86rf230_write_subreg(struct at86rf230_local *lp,
 194                        unsigned int addr, unsigned int mask,
 195                        unsigned int shift, unsigned int data)
 196 {
 197         bool sleep = lp->sleep;
 198         int ret;
 199
 200         /* awake for register setting if sleep */
 201         if (sleep)
 202                 at86rf230_awake(lp);
 203
 204         ret = regmap_update_bits(lp->regmap, addr, mask, data << shift);
 205
 206         /* sleep again if was sleeping */
 207         if (sleep)
 208                 at86rf230_sleep(lp);
 209
 210         return ret;
 211 }
 212
 213 static inline void
 214 at86rf230_slp_tr_rising_edge(struct at86rf230_local *lp)
 215 {
 216         gpio_set_value(lp->slp_tr, 1);
 217         udelay(1);
 218         gpio_set_value(lp->slp_tr, 0);
 219 }
 220
 221 static bool
 222 at86rf230_reg_writeable(struct device *dev, unsigned int reg)
 223 {
 224         switch (reg) {
 225         case RG_TRX_STATE:
 226         case RG_TRX_CTRL_0:
 227         case RG_TRX_CTRL_1:
 228         case RG_PHY_TX_PWR:
 229         case RG_PHY_ED_LEVEL:
 230         case RG_PHY_CC_CCA:
 231         case RG_CCA_THRES:
 232         case RG_RX_CTRL:
 233         case RG_SFD_VALUE:
 234         case RG_TRX_CTRL_2:
 235         case RG_ANT_DIV:
 236         case RG_IRQ_MASK:
 237         case RG_VREG_CTRL:
 238         case RG_BATMON:
 239         case RG_XOSC_CTRL:
 240         case RG_RX_SYN:
 241         case RG_XAH_CTRL_1:
 242         case RG_FTN_CTRL:
 243         case RG_PLL_CF:
 244         case RG_PLL_DCU:
 245         case RG_SHORT_ADDR_0:
 246         case RG_SHORT_ADDR_1:
 247         case RG_PAN_ID_0:
 248         case RG_PAN_ID_1:
 249         case RG_IEEE_ADDR_0:
 250         case RG_IEEE_ADDR_1:
 251         case RG_IEEE_ADDR_2:
 252         case RG_IEEE_ADDR_3:
 253         case RG_IEEE_ADDR_4:
 254         case RG_IEEE_ADDR_5:
 255         case RG_IEEE_ADDR_6:
 256         case RG_IEEE_ADDR_7:
 257         case RG_XAH_CTRL_0:
 258         case RG_CSMA_SEED_0:
 259         case RG_CSMA_SEED_1:
 260         case RG_CSMA_BE:
 261                 return true;
 262         default:
 263                 return false;
 264         }
 265 }
 266
 267 static bool
 268 at86rf230_reg_readable(struct device *dev, unsigned int reg)
 269 {
 270         bool rc;
 271
 272         /* all writeable are also readable */
 273         rc = at86rf230_reg_writeable(dev, reg);
 274         if (rc)
 275                 return rc;
 276
 277         /* readonly regs */
 278         switch (reg) {
 279         case RG_TRX_STATUS:
 280         case RG_PHY_RSSI:
 281         case RG_IRQ_STATUS:
 282         case RG_PART_NUM:
 283         case RG_VERSION_NUM:
 284         case RG_MAN_ID_1:
 285         case RG_MAN_ID_0:
 286                 return true;
 287         default:
 288                 return false;
 289         }
 290 }
 291
 292 static bool
 293 at86rf230_reg_volatile(struct device *dev, unsigned int reg)
 294 {
 295         /* can be changed during runtime */
 296         switch (reg) {
 297         case RG_TRX_STATUS:
 298         case RG_TRX_STATE:
 299         case RG_PHY_RSSI:
 300         case RG_PHY_ED_LEVEL:
 301         case RG_IRQ_STATUS:
 302         case RG_VREG_CTRL:
 303         case RG_PLL_CF:
 304         case RG_PLL_DCU:
 305                 return true;
 306         default:
 307                 return false;
 308         }
 309 }
 310
 311 static bool
 312 at86rf230_reg_precious(struct device *dev, unsigned int reg)
 313 {
 314         /* don't clear irq line on read */
 315         switch (reg) {
 316         case RG_IRQ_STATUS:
 317                 return true;
 318         default:
 319                 return false;
 320         }
 321 }
 322
 323 static const struct regmap_config at86rf230_regmap_spi_config = {
 324         .reg_bits = 8,
 325         .val_bits = 8,
 326         .write_flag_mask = CMD_REG | CMD_WRITE,
 327         .read_flag_mask = CMD_REG,
 328         .cache_type = REGCACHE_RBTREE,
 329         .max_register = AT86RF2XX_NUMREGS,
 330         .writeable_reg = at86rf230_reg_writeable,
 331         .readable_reg = at86rf230_reg_readable,
 332         .volatile_reg = at86rf230_reg_volatile,
 333         .precious_reg = at86rf230_reg_precious,
 334 };
 335
 336 static void
 337 at86rf230_async_error_recover(void *context)
 338 {
 339         struct at86rf230_state_change *ctx = context;
 340         struct at86rf230_local *lp = ctx->lp;
 341
 342         lp->is_tx = 0;
 343         at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON, NULL, false);
 344         ieee802154_wake_queue(lp->hw);
 345 }
 346
 347 static inline void
 348 at86rf230_async_error(struct at86rf230_local *lp,
 349                       struct at86rf230_state_change *ctx, int rc)
 350 {
 351         dev_err(&lp->spi->dev, "spi_async error %d\n", rc);
 352
 353         at86rf230_async_state_change(lp, ctx, STATE_FORCE_TRX_OFF,
 354                                      at86rf230_async_error_recover, false);
 355 }
 356
 357 /* Generic function to get some register value in async mode */
 358 static void
 359 at86rf230_async_read_reg(struct at86rf230_local *lp, const u8 reg,
 360                          struct at86rf230_state_change *ctx,
 361                          void (*complete)(void *context),
 362                          const bool irq_enable)
 363 {
 364         int rc;
 365
 366         u8 *tx_buf = ctx->buf;
 367
 368         tx_buf[0] = (reg & CMD_REG_MASK) | CMD_REG;
 369         ctx->msg.complete = complete;
 370         ctx->irq_enable = irq_enable;
 371         rc = spi_async(lp->spi, &ctx->msg);
 372         if (rc) {
 373                 if (irq_enable)
 374                         enable_irq(ctx->irq);
 375
 376                 at86rf230_async_error(lp, ctx, rc);
 377         }
 378 }
 379
 380 static inline u8 at86rf230_state_to_force(u8 state)
 381 {
 382         if (state == STATE_TX_ON)
 383                 return STATE_FORCE_TX_ON;
 384         else
 385                 return STATE_FORCE_TRX_OFF;
 386 }
 387
 388 static void
 389 at86rf230_async_state_assert(void *context)
 390 {
 391         struct at86rf230_state_change *ctx = context;
 392         struct at86rf230_local *lp = ctx->lp;
 393         const u8 *buf = ctx->buf;
 394         const u8 trx_state = buf[1] & TRX_STATE_MASK;
 395
 396         /* Assert state change */
 397         if (trx_state != ctx->to_state) {
 398                 /* Special handling if transceiver state is in
 399                  * STATE_BUSY_RX_AACK and a SHR was detected.
 400                  */
 401                 if  (trx_state == STATE_BUSY_RX_AACK) {
 402                         /* Undocumented race condition. If we send a state
 403                          * change to STATE_RX_AACK_ON the transceiver could
 404                          * change his state automatically to STATE_BUSY_RX_AACK
 405                          * if a SHR was detected. This is not an error, but we
 406                          * can't assert this.
 407                          */
 408                         if (ctx->to_state == STATE_RX_AACK_ON)
 409                                 goto done;
 410
 411                         /* If we change to STATE_TX_ON without forcing and
 412                          * transceiver state is STATE_BUSY_RX_AACK, we wait
 413                          * 'tFrame + tPAck' receiving time. In this time the
 414                          * PDU should be received. If the transceiver is still
 415                          * in STATE_BUSY_RX_AACK, we run a force state change
 416                          * to STATE_TX_ON. This is a timeout handling, if the
 417                          * transceiver stucks in STATE_BUSY_RX_AACK.
 418                          *
 419                          * Additional we do several retries to try to get into
 420                          * TX_ON state without forcing. If the retries are
 421                          * higher or equal than AT86RF2XX_MAX_TX_RETRIES we
 422                          * will do a force change.
 423                          */
 424                         if (ctx->to_state == STATE_TX_ON ||
 425                             ctx->to_state == STATE_TRX_OFF) {
 426                                 u8 state = ctx->to_state;
 427
 428                                 if (lp->tx_retry >= AT86RF2XX_MAX_TX_RETRIES)
 429                                         state = at86rf230_state_to_force(state);
 430                                 lp->tx_retry++;
 431
 432                                 at86rf230_async_state_change(lp, ctx, state,
 433                                                              ctx->complete,
 434                                                              ctx->irq_enable);
 435                                 return;
 436                         }
 437                 }
 438
 439                 dev_warn(&lp->spi->dev, "unexcept state change from 0x%02x to 0x%02x. Actual state: 0x%02x\n",
 440                          ctx->from_state, ctx->to_state, trx_state);
 441         }
 442
 443 done:
 444         if (ctx->complete)
 445                 ctx->complete(context);
 446 }
 447
 448 static enum hrtimer_restart at86rf230_async_state_timer(struct hrtimer *timer)
 449 {
 450         struct at86rf230_state_change *ctx =
 451                 container_of(timer, struct at86rf230_state_change, timer);
 452         struct at86rf230_local *lp = ctx->lp;
 453
 454         at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 455                                  at86rf230_async_state_assert,
 456                                  ctx->irq_enable);
 457
 458         return HRTIMER_NORESTART;
 459 }
 460
 461 /* Do state change timing delay. */
 462 static void
 463 at86rf230_async_state_delay(void *context)
 464 {
 465         struct at86rf230_state_change *ctx = context;
 466         struct at86rf230_local *lp = ctx->lp;
 467         struct at86rf2xx_chip_data *c = lp->data;
 468         bool force = false;
 469         ktime_t tim;
 470
 471         /* The force state changes are will show as normal states in the
 472          * state status subregister. We change the to_state to the
 473          * corresponding one and remember if it was a force change, this
 474          * differs if we do a state change from STATE_BUSY_RX_AACK.
 475          */
 476         switch (ctx->to_state) {
 477         case STATE_FORCE_TX_ON:
 478                 ctx->to_state = STATE_TX_ON;
 479                 force = true;
 480                 break;
 481         case STATE_FORCE_TRX_OFF:
 482                 ctx->to_state = STATE_TRX_OFF;
 483                 force = true;
 484                 break;
 485         default:
 486                 break;
 487         }
 488
 489         switch (ctx->from_state) {
 490         case STATE_TRX_OFF:
 491                 switch (ctx->to_state) {
 492                 case STATE_RX_AACK_ON:
 493                         tim = ktime_set(0, c->t_off_to_aack * NSEC_PER_USEC);
 494                         /* state change from TRX_OFF to RX_AACK_ON to do a
 495                          * calibration, we need to reset the timeout for the
 496                          * next one.
 497                          */
 498                         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
 499                         goto change;
 500                 case STATE_TX_ARET_ON:
 501                 case STATE_TX_ON:
 502                         tim = ktime_set(0, c->t_off_to_tx_on * NSEC_PER_USEC);
 503                         /* state change from TRX_OFF to TX_ON or ARET_ON to do
 504                          * a calibration, we need to reset the timeout for the
 505                          * next one.
 506                          */
 507                         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
 508                         goto change;
 509                 default:
 510                         break;
 511                 }
 512                 break;
 513         case STATE_BUSY_RX_AACK:
 514                 switch (ctx->to_state) {
 515                 case STATE_TRX_OFF:
 516                 case STATE_TX_ON:
 517                         /* Wait for worst case receiving time if we
 518                          * didn't make a force change from BUSY_RX_AACK
 519                          * to TX_ON or TRX_OFF.
 520                          */
 521                         if (!force) {
 522                                 tim = ktime_set(0, (c->t_frame + c->t_p_ack) *
 523                                                    NSEC_PER_USEC);
 524                                 goto change;
 525                         }
 526                         break;
 527                 default:
 528                         break;
 529                 }
 530                 break;
 531         /* Default value, means RESET state */
 532         case STATE_P_ON:
 533                 switch (ctx->to_state) {
 534                 case STATE_TRX_OFF:
 535                         tim = ktime_set(0, c->t_reset_to_off * NSEC_PER_USEC);
 536                         goto change;
 537                 default:
 538                         break;
 539                 }
 540                 break;
 541         default:
 542                 break;
 543         }
 544
 545         /* Default delay is 1us in the most cases */
 546         udelay(1);
 547         at86rf230_async_state_timer(&ctx->timer);
 548         return;
 549
 550 change:
 551         hrtimer_start(&ctx->timer, tim, HRTIMER_MODE_REL);
 552 }
 553
 554 static void
 555 at86rf230_async_state_change_start(void *context)
 556 {
 557         struct at86rf230_state_change *ctx = context;
 558         struct at86rf230_local *lp = ctx->lp;
 559         u8 *buf = ctx->buf;
 560         const u8 trx_state = buf[1] & TRX_STATE_MASK;
 561         int rc;
 562
 563         /* Check for "possible" STATE_TRANSITION_IN_PROGRESS */
 564         if (trx_state == STATE_TRANSITION_IN_PROGRESS) {
 565                 udelay(1);
 566                 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 567                                          at86rf230_async_state_change_start,
 568                                          ctx->irq_enable);
 569                 return;
 570         }
 571
 572         /* Check if we already are in the state which we change in */
 573         if (trx_state == ctx->to_state) {
 574                 if (ctx->complete)
 575                         ctx->complete(context);
 576                 return;
 577         }
 578
 579         /* Set current state to the context of state change */
 580         ctx->from_state = trx_state;
 581
 582         /* Going into the next step for a state change which do a timing
 583          * relevant delay.
 584          */
 585         buf[0] = (RG_TRX_STATE & CMD_REG_MASK) | CMD_REG | CMD_WRITE;
 586         buf[1] = ctx->to_state;
 587         ctx->msg.complete = at86rf230_async_state_delay;
 588         rc = spi_async(lp->spi, &ctx->msg);
 589         if (rc) {
 590                 if (ctx->irq_enable)
 591                         enable_irq(ctx->irq);
 592
 593                 at86rf230_async_error(lp, ctx, rc);
 594         }
 595 }
 596
 597 static void
 598 at86rf230_async_state_change(struct at86rf230_local *lp,
 599                              struct at86rf230_state_change *ctx,
 600                              const u8 state, void (*complete)(void *context),
 601                              const bool irq_enable)
 602 {
 603         /* Initialization for the state change context */
 604         ctx->to_state = state;
 605         ctx->complete = complete;
 606         ctx->irq_enable = irq_enable;
 607         at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 608                                  at86rf230_async_state_change_start,
 609                                  irq_enable);
 610 }
 611
 612 static void
 613 at86rf230_sync_state_change_complete(void *context)
 614 {
 615         struct at86rf230_state_change *ctx = context;
 616         struct at86rf230_local *lp = ctx->lp;
 617
 618         complete(&lp->state_complete);
 619 }
 620
 621 /* This function do a sync framework above the async state change.
 622  * Some callbacks of the IEEE 802.15.4 driver interface need to be
 623  * handled synchronously.
 624  */
 625 static int
 626 at86rf230_sync_state_change(struct at86rf230_local *lp, unsigned int state)
 627 {
 628         unsigned long rc;
 629
 630         at86rf230_async_state_change(lp, &lp->state, state,
 631                                      at86rf230_sync_state_change_complete,
 632                                      false);
 633
 634         rc = wait_for_completion_timeout(&lp->state_complete,
 635                                          msecs_to_jiffies(100));
 636         if (!rc) {
 637                 at86rf230_async_error(lp, &lp->state, -ETIMEDOUT);
 638                 return -ETIMEDOUT;
 639         }
 640
 641         return 0;
 642 }
 643
 644 static void
 645 at86rf230_tx_complete(void *context)
 646 {
 647         struct at86rf230_state_change *ctx = context;
 648         struct at86rf230_local *lp = ctx->lp;
 649
 650         enable_irq(ctx->irq);
 651
 652         ieee802154_xmit_complete(lp->hw, lp->tx_skb, false);
 653 }
 654
 655 static void
 656 at86rf230_tx_on(void *context)
 657 {
 658         struct at86rf230_state_change *ctx = context;
 659         struct at86rf230_local *lp = ctx->lp;
 660
 661         at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON,
 662                                      at86rf230_tx_complete, true);
 663 }
 664
 665 static void
 666 at86rf230_tx_trac_check(void *context)
 667 {
 668         struct at86rf230_state_change *ctx = context;
 669         struct at86rf230_local *lp = ctx->lp;
 670
 671         at86rf230_async_state_change(lp, &lp->irq, STATE_TX_ON,
 672                                      at86rf230_tx_on, true);
 673 }
 674
 675 static void
 676 at86rf230_rx_read_frame_complete(void *context)
 677 {
 678         struct at86rf230_state_change *ctx = context;
 679         struct at86rf230_local *lp = ctx->lp;
 680         u8 rx_local_buf[AT86RF2XX_MAX_BUF];
 681         const u8 *buf = ctx->buf;
 682         struct sk_buff *skb;
 683         u8 len, lqi;
 684
 685         len = buf[1];
 686         if (!ieee802154_is_valid_psdu_len(len)) {
 687                 dev_vdbg(&lp->spi->dev, "corrupted frame received\n");
 688                 len = IEEE802154_MTU;
 689         }
 690         lqi = buf[2 + len];
 691
 692         memcpy(rx_local_buf, buf + 2, len);
 693         ctx->trx.len = 2;
 694         enable_irq(ctx->irq);
 695
 696         skb = dev_alloc_skb(IEEE802154_MTU);
 697         if (!skb) {
 698                 dev_vdbg(&lp->spi->dev, "failed to allocate sk_buff\n");
 699                 return;
 700         }
 701
 702         memcpy(skb_put(skb, len), rx_local_buf, len);
 703         ieee802154_rx_irqsafe(lp->hw, skb, lqi);
 704 }
 705
 706 static void
 707 at86rf230_rx_read_frame(void *context)
 708 {
 709         struct at86rf230_state_change *ctx = context;
 710         struct at86rf230_local *lp = ctx->lp;
 711         u8 *buf = ctx->buf;
 712         int rc;
 713
 714         buf[0] = CMD_FB;
 715         ctx->trx.len = AT86RF2XX_MAX_BUF;
 716         ctx->msg.complete = at86rf230_rx_read_frame_complete;
 717         rc = spi_async(lp->spi, &ctx->msg);
 718         if (rc) {
 719                 ctx->trx.len = 2;
 720                 enable_irq(ctx->irq);
 721                 at86rf230_async_error(lp, ctx, rc);
 722         }
 723 }
 724
 725 static void
 726 at86rf230_rx_trac_check(void *context)
 727 {
 728         /* Possible check on trac status here. This could be useful to make
 729          * some stats why receive is failed. Not used at the moment, but it's
 730          * maybe timing relevant. Datasheet doesn't say anything about this.
 731          * The programming guide say do it so.
 732          */
 733
 734         at86rf230_rx_read_frame(context);
 735 }
 736
 737 static void
 738 at86rf230_irq_trx_end(struct at86rf230_local *lp)
 739 {
 740         if (lp->is_tx) {
 741                 lp->is_tx = 0;
 742                 at86rf230_async_read_reg(lp, RG_TRX_STATE, &lp->irq,
 743                                          at86rf230_tx_trac_check, true);
 744         } else {
 745                 at86rf230_async_read_reg(lp, RG_TRX_STATE, &lp->irq,
 746                                          at86rf230_rx_trac_check, true);
 747         }
 748 }
 749
 750 static void
 751 at86rf230_irq_status(void *context)
 752 {
 753         struct at86rf230_state_change *ctx = context;
 754         struct at86rf230_local *lp = ctx->lp;
 755         const u8 *buf = ctx->buf;
 756         const u8 irq = buf[1];
 757
 758         if (irq & IRQ_TRX_END) {
 759                 at86rf230_irq_trx_end(lp);
 760         } else {
 761                 enable_irq(ctx->irq);
 762                 dev_err(&lp->spi->dev, "not supported irq %02x received\n",
 763                         irq);
 764         }
 765 }
 766
 767 static irqreturn_t at86rf230_isr(int irq, void *data)
 768 {
 769         struct at86rf230_local *lp = data;
 770         struct at86rf230_state_change *ctx = &lp->irq;
 771         u8 *buf = ctx->buf;
 772         int rc;
 773
 774         disable_irq_nosync(irq);
 775
 776         buf[0] = (RG_IRQ_STATUS & CMD_REG_MASK) | CMD_REG;
 777         ctx->msg.complete = at86rf230_irq_status;
 778         rc = spi_async(lp->spi, &ctx->msg);
 779         if (rc) {
 780                 enable_irq(irq);
 781                 at86rf230_async_error(lp, ctx, rc);
 782                 return IRQ_NONE;
 783         }
 784
 785         return IRQ_HANDLED;
 786 }
 787
 788 static void
 789 at86rf230_write_frame_complete(void *context)
 790 {
 791         struct at86rf230_state_change *ctx = context;
 792         struct at86rf230_local *lp = ctx->lp;
 793         u8 *buf = ctx->buf;
 794         int rc;
 795
 796         ctx->trx.len = 2;
 797
 798         if (gpio_is_valid(lp->slp_tr)) {
 799                 at86rf230_slp_tr_rising_edge(lp);
 800         } else {
 801                 buf[0] = (RG_TRX_STATE & CMD_REG_MASK) | CMD_REG | CMD_WRITE;
 802                 buf[1] = STATE_BUSY_TX;
 803                 ctx->msg.complete = NULL;
 804                 rc = spi_async(lp->spi, &ctx->msg);
 805                 if (rc)
 806                         at86rf230_async_error(lp, ctx, rc);
 807         }
 808 }
 809
 810 static void
 811 at86rf230_write_frame(void *context)
 812 {
 813         struct at86rf230_state_change *ctx = context;
 814         struct at86rf230_local *lp = ctx->lp;
 815         struct sk_buff *skb = lp->tx_skb;
 816         u8 *buf = ctx->buf;
 817         int rc;
 818
 819         lp->is_tx = 1;
 820
 821         buf[0] = CMD_FB | CMD_WRITE;
 822         buf[1] = skb->len + 2;
 823         memcpy(buf + 2, skb->data, skb->len);
 824         ctx->trx.len = skb->len + 2;
 825         ctx->msg.complete = at86rf230_write_frame_complete;
 826         rc = spi_async(lp->spi, &ctx->msg);
 827         if (rc) {
 828                 ctx->trx.len = 2;
 829                 at86rf230_async_error(lp, ctx, rc);
 830         }
 831 }
 832
 833 static void
 834 at86rf230_xmit_tx_on(void *context)
 835 {
 836         struct at86rf230_state_change *ctx = context;
 837         struct at86rf230_local *lp = ctx->lp;
 838
 839         at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
 840                                      at86rf230_write_frame, false);
 841 }
 842
 843 static void
 844 at86rf230_xmit_start(void *context)
 845 {
 846         struct at86rf230_state_change *ctx = context;
 847         struct at86rf230_local *lp = ctx->lp;
 848
 849         /* check if we change from off state */
 850         if (lp->is_tx_from_off) {
 851                 lp->is_tx_from_off = false;
 852                 at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
 853                                              at86rf230_write_frame,
 854                                              false);
 855         } else {
 856                 at86rf230_async_state_change(lp, ctx, STATE_TX_ON,
 857                                              at86rf230_xmit_tx_on,
 858                                              false);
 859         }
 860 }
 861
 862 static int
 863 at86rf230_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
 864 {
 865         struct at86rf230_local *lp = hw->priv;
 866         struct at86rf230_state_change *ctx = &lp->tx;
 867
 868         lp->tx_skb = skb;
 869         lp->tx_retry = 0;
 870
 871         /* After 5 minutes in PLL and the same frequency we run again the
 872          * calibration loops which is recommended by at86rf2xx datasheets.
 873          *
 874          * The calibration is initiate by a state change from TRX_OFF
 875          * to TX_ON, the lp->cal_timeout should be reinit by state_delay
 876          * function then to start in the next 5 minutes.
 877          */
 878         if (time_is_before_jiffies(lp->cal_timeout)) {
 879                 lp->is_tx_from_off = true;
 880                 at86rf230_async_state_change(lp, ctx, STATE_TRX_OFF,
 881                                              at86rf230_xmit_start, false);
 882         } else {
 883                 at86rf230_xmit_start(ctx);
 884         }
 885
 886         return 0;
 887 }
 888
 889 static int
 890 at86rf230_ed(struct ieee802154_hw *hw, u8 *level)
 891 {
 892         BUG_ON(!level);
 893         *level = 0xbe;
 894         return 0;
 895 }
 896
 897 static int
 898 at86rf230_start(struct ieee802154_hw *hw)
 899 {
 900         struct at86rf230_local *lp = hw->priv;
 901
 902         at86rf230_awake(lp);
 903         enable_irq(lp->spi->irq);
 904
 905         return at86rf230_sync_state_change(lp, STATE_RX_AACK_ON);
 906 }
 907
 908 static void
 909 at86rf230_stop(struct ieee802154_hw *hw)
 910 {
 911         struct at86rf230_local *lp = hw->priv;
 912         u8 csma_seed[2];
 913
 914         at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
 915
 916         disable_irq(lp->spi->irq);
 917
 918         /* It's recommended to set random new csma_seeds before sleep state.
 919          * Makes only sense in the stop callback, not doing this inside of
 920          * at86rf230_sleep, this is also used when we don't transmit afterwards
 921          * when calling start callback again.
 922          */
 923         get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
 924         at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
 925         at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
 926
 927         at86rf230_sleep(lp);
 928 }
 929
 930 static int
 931 at86rf23x_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
 932 {
 933         return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
 934 }
 935
 936 #define AT86RF2XX_MAX_ED_LEVELS 0xF
 937 static const s32 at86rf23x_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = {
 938         -9100, -8900, -8700, -8500, -8300, -8100, -7900, -7700, -7500, -7300,
 939         -7100, -6900, -6700, -6500, -6300, -6100,
 940 };
 941
 942 static const s32 at86rf212_ed_levels_100[AT86RF2XX_MAX_ED_LEVELS + 1] = {
 943         -10000, -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200,
 944         -8000, -7800, -7600, -7400, -7200, -7000,
 945 };
 946
 947 static const s32 at86rf212_ed_levels_98[AT86RF2XX_MAX_ED_LEVELS + 1] = {
 948         -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000,
 949         -7800, -7600, -7400, -7200, -7000, -6800,
 950 };
 951
 952 static inline int
 953 at86rf212_update_cca_ed_level(struct at86rf230_local *lp, int rssi_base_val)
 954 {
 955         unsigned int cca_ed_thres;
 956         int rc;
 957
 958         rc = at86rf230_read_subreg(lp, SR_CCA_ED_THRES, &cca_ed_thres);
 959         if (rc < 0)
 960                 return rc;
 961
 962         switch (rssi_base_val) {
 963         case -98:
 964                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_98;
 965                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_98);
 966                 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_98[cca_ed_thres];
 967                 break;
 968         case -100:
 969                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
 970                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
 971                 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_100[cca_ed_thres];
 972                 break;
 973         default:
 974                 WARN_ON(1);
 975         }
 976
 977         return 0;
 978 }
 979
 980 static int
 981 at86rf212_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
 982 {
 983         int rc;
 984
 985         if (channel == 0)
 986                 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 0);
 987         else
 988                 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 1);
 989         if (rc < 0)
 990                 return rc;
 991
 992         if (page == 0) {
 993                 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 0);
 994                 lp->data->rssi_base_val = -100;
 995         } else {
 996                 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 1);
 997                 lp->data->rssi_base_val = -98;
 998         }
 999         if (rc < 0)
1000                 return rc;
1001
1002         rc = at86rf212_update_cca_ed_level(lp, lp->data->rssi_base_val);
1003         if (rc < 0)
1004                 return rc;
1005
1006         /* This sets the symbol_duration according frequency on the 212.
1007          * TODO move this handling while set channel and page in cfg802154.
1008          * We can do that, this timings are according 802.15.4 standard.
1009          * If we do that in cfg802154, this is a more generic calculation.
1010          *
1011          * This should also protected from ifs_timer. Means cancel timer and
1012          * init with a new value. For now, this is okay.
1013          */
1014         if (channel == 0) {
1015                 if (page == 0) {
1016                         /* SUB:0 and BPSK:0 -> BPSK-20 */
1017                         lp->hw->phy->symbol_duration = 50;
1018                 } else {
1019                         /* SUB:1 and BPSK:0 -> BPSK-40 */
1020                         lp->hw->phy->symbol_duration = 25;
1021                 }
1022         } else {
1023                 if (page == 0)
1024                         /* SUB:0 and BPSK:1 -> OQPSK-100/200/400 */
1025                         lp->hw->phy->symbol_duration = 40;
1026                 else
1027                         /* SUB:1 and BPSK:1 -> OQPSK-250/500/1000 */
1028                         lp->hw->phy->symbol_duration = 16;
1029         }
1030
1031         lp->hw->phy->lifs_period = IEEE802154_LIFS_PERIOD *
1032                                    lp->hw->phy->symbol_duration;
1033         lp->hw->phy->sifs_period = IEEE802154_SIFS_PERIOD *
1034                                    lp->hw->phy->symbol_duration;
1035
1036         return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
1037 }
1038
1039 static int
1040 at86rf230_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
1041 {
1042         struct at86rf230_local *lp = hw->priv;
1043         int rc;
1044
1045         rc = lp->data->set_channel(lp, page, channel);
1046         /* Wait for PLL */
1047         usleep_range(lp->data->t_channel_switch,
1048                      lp->data->t_channel_switch + 10);
1049
1050         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
1051         return rc;
1052 }
1053
1054 static int
1055 at86rf230_set_hw_addr_filt(struct ieee802154_hw *hw,
1056                            struct ieee802154_hw_addr_filt *filt,
1057                            unsigned long changed)
1058 {
1059         struct at86rf230_local *lp = hw->priv;
1060
1061         if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
1062                 u16 addr = le16_to_cpu(filt->short_addr);
1063
1064                 dev_vdbg(&lp->spi->dev,
1065                          "at86rf230_set_hw_addr_filt called for saddr\n");
1066                 __at86rf230_write(lp, RG_SHORT_ADDR_0, addr);
1067                 __at86rf230_write(lp, RG_SHORT_ADDR_1, addr >> 8);
1068         }
1069
1070         if (changed & IEEE802154_AFILT_PANID_CHANGED) {
1071                 u16 pan = le16_to_cpu(filt->pan_id);
1072
1073                 dev_vdbg(&lp->spi->dev,
1074                          "at86rf230_set_hw_addr_filt called for pan id\n");
1075                 __at86rf230_write(lp, RG_PAN_ID_0, pan);
1076                 __at86rf230_write(lp, RG_PAN_ID_1, pan >> 8);
1077         }
1078
1079         if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
1080                 u8 i, addr[8];
1081
1082                 memcpy(addr, &filt->ieee_addr, 8);
1083                 dev_vdbg(&lp->spi->dev,
1084                          "at86rf230_set_hw_addr_filt called for IEEE addr\n");
1085                 for (i = 0; i < 8; i++)
1086                         __at86rf230_write(lp, RG_IEEE_ADDR_0 + i, addr[i]);
1087         }
1088
1089         if (changed & IEEE802154_AFILT_PANC_CHANGED) {
1090                 dev_vdbg(&lp->spi->dev,
1091                          "at86rf230_set_hw_addr_filt called for panc change\n");
1092                 if (filt->pan_coord)
1093                         at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 1);
1094                 else
1095                         at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 0);
1096         }
1097
1098         return 0;
1099 }
1100
1101 #define AT86RF23X_MAX_TX_POWERS 0xF
1102 static const s32 at86rf233_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1103         400, 370, 340, 300, 250, 200, 100, 0, -100, -200, -300, -400, -600,
1104         -800, -1200, -1700,
1105 };
1106
1107 static const s32 at86rf231_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1108         300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700,
1109         -900, -1200, -1700,
1110 };
1111
1112 #define AT86RF212_MAX_TX_POWERS 0x1F
1113 static const s32 at86rf212_powers[AT86RF212_MAX_TX_POWERS + 1] = {
1114         500, 400, 300, 200, 100, 0, -100, -200, -300, -400, -500, -600, -700,
1115         -800, -900, -1000, -1100, -1200, -1300, -1400, -1500, -1600, -1700,
1116         -1800, -1900, -2000, -2100, -2200, -2300, -2400, -2500, -2600,
1117 };
1118
1119 static int
1120 at86rf23x_set_txpower(struct at86rf230_local *lp, s32 mbm)
1121 {
1122         u32 i;
1123
1124         for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1125                 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1126                         return at86rf230_write_subreg(lp, SR_TX_PWR_23X, i);
1127         }
1128
1129         return -EINVAL;
1130 }
1131
1132 static int
1133 at86rf212_set_txpower(struct at86rf230_local *lp, s32 mbm)
1134 {
1135         u32 i;
1136
1137         for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1138                 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1139                         return at86rf230_write_subreg(lp, SR_TX_PWR_212, i);
1140         }
1141
1142         return -EINVAL;
1143 }
1144
1145 static int
1146 at86rf230_set_txpower(struct ieee802154_hw *hw, s32 mbm)
1147 {
1148         struct at86rf230_local *lp = hw->priv;
1149
1150         return lp->data->set_txpower(lp, mbm);
1151 }
1152
1153 static int
1154 at86rf230_set_lbt(struct ieee802154_hw *hw, bool on)
1155 {
1156         struct at86rf230_local *lp = hw->priv;
1157
1158         return at86rf230_write_subreg(lp, SR_CSMA_LBT_MODE, on);
1159 }
1160
1161 static int
1162 at86rf230_set_cca_mode(struct ieee802154_hw *hw,
1163                        const struct wpan_phy_cca *cca)
1164 {
1165         struct at86rf230_local *lp = hw->priv;
1166         u8 val;
1167
1168         /* mapping 802.15.4 to driver spec */
1169         switch (cca->mode) {
1170         case NL802154_CCA_ENERGY:
1171                 val = 1;
1172                 break;
1173         case NL802154_CCA_CARRIER:
1174                 val = 2;
1175                 break;
1176         case NL802154_CCA_ENERGY_CARRIER:
1177                 switch (cca->opt) {
1178                 case NL802154_CCA_OPT_ENERGY_CARRIER_AND:
1179                         val = 3;
1180                         break;
1181                 case NL802154_CCA_OPT_ENERGY_CARRIER_OR:
1182                         val = 0;
1183                         break;
1184                 default:
1185                         return -EINVAL;
1186                 }
1187                 break;
1188         default:
1189                 return -EINVAL;
1190         }
1191
1192         return at86rf230_write_subreg(lp, SR_CCA_MODE, val);
1193 }
1194
1195
1196 static int
1197 at86rf230_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
1198 {
1199         struct at86rf230_local *lp = hw->priv;
1200         u32 i;
1201
1202         for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) {
1203                 if (hw->phy->supported.cca_ed_levels[i] == mbm)
1204                         return at86rf230_write_subreg(lp, SR_CCA_ED_THRES, i);
1205         }
1206
1207         return -EINVAL;
1208 }
1209
1210 static int
1211 at86rf230_set_csma_params(struct ieee802154_hw *hw, u8 min_be, u8 max_be,
1212                           u8 retries)
1213 {
1214         struct at86rf230_local *lp = hw->priv;
1215         int rc;
1216
1217         rc = at86rf230_write_subreg(lp, SR_MIN_BE, min_be);
1218         if (rc)
1219                 return rc;
1220
1221         rc = at86rf230_write_subreg(lp, SR_MAX_BE, max_be);
1222         if (rc)
1223                 return rc;
1224
1225         return at86rf230_write_subreg(lp, SR_MAX_CSMA_RETRIES, retries);
1226 }
1227
1228 static int
1229 at86rf230_set_frame_retries(struct ieee802154_hw *hw, s8 retries)
1230 {
1231         struct at86rf230_local *lp = hw->priv;
1232
1233         return at86rf230_write_subreg(lp, SR_MAX_FRAME_RETRIES, retries);
1234 }
1235
1236 static int
1237 at86rf230_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
1238 {
1239         struct at86rf230_local *lp = hw->priv;
1240         int rc;
1241
1242         if (on) {
1243                 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 1);
1244                 if (rc < 0)
1245                         return rc;
1246
1247                 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 1);
1248                 if (rc < 0)
1249                         return rc;
1250         } else {
1251                 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 0);
1252                 if (rc < 0)
1253                         return rc;
1254
1255                 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 0);
1256                 if (rc < 0)
1257                         return rc;
1258         }
1259
1260         return 0;
1261 }
1262
1263 static const struct ieee802154_ops at86rf230_ops = {
1264         .owner = THIS_MODULE,
1265         .xmit_async = at86rf230_xmit,
1266         .ed = at86rf230_ed,
1267         .set_channel = at86rf230_channel,
1268         .start = at86rf230_start,
1269         .stop = at86rf230_stop,
1270         .set_hw_addr_filt = at86rf230_set_hw_addr_filt,
1271         .set_txpower = at86rf230_set_txpower,
1272         .set_lbt = at86rf230_set_lbt,
1273         .set_cca_mode = at86rf230_set_cca_mode,
1274         .set_cca_ed_level = at86rf230_set_cca_ed_level,
1275         .set_csma_params = at86rf230_set_csma_params,
1276         .set_frame_retries = at86rf230_set_frame_retries,
1277         .set_promiscuous_mode = at86rf230_set_promiscuous_mode,
1278 };
1279
1280 static struct at86rf2xx_chip_data at86rf233_data = {
1281         .t_sleep_cycle = 330,
1282         .t_channel_switch = 11,
1283         .t_reset_to_off = 26,
1284         .t_off_to_aack = 80,
1285         .t_off_to_tx_on = 80,
1286         .t_off_to_sleep = 35,
1287         .t_sleep_to_off = 210,
1288         .t_frame = 4096,
1289         .t_p_ack = 545,
1290         .rssi_base_val = -91,
1291         .set_channel = at86rf23x_set_channel,
1292         .set_txpower = at86rf23x_set_txpower,
1293 };
1294
1295 static struct at86rf2xx_chip_data at86rf231_data = {
1296         .t_sleep_cycle = 330,
1297         .t_channel_switch = 24,
1298         .t_reset_to_off = 37,
1299         .t_off_to_aack = 110,
1300         .t_off_to_tx_on = 110,
1301         .t_off_to_sleep = 35,
1302         .t_sleep_to_off = 380,
1303         .t_frame = 4096,
1304         .t_p_ack = 545,
1305         .rssi_base_val = -91,
1306         .set_channel = at86rf23x_set_channel,
1307         .set_txpower = at86rf23x_set_txpower,
1308 };
1309
1310 static struct at86rf2xx_chip_data at86rf212_data = {
1311         .t_sleep_cycle = 330,
1312         .t_channel_switch = 11,
1313         .t_reset_to_off = 26,
1314         .t_off_to_aack = 200,
1315         .t_off_to_tx_on = 200,
1316         .t_off_to_sleep = 35,
1317         .t_sleep_to_off = 380,
1318         .t_frame = 4096,
1319         .t_p_ack = 545,
1320         .rssi_base_val = -100,
1321         .set_channel = at86rf212_set_channel,
1322         .set_txpower = at86rf212_set_txpower,
1323 };
1324
1325 static int at86rf230_hw_init(struct at86rf230_local *lp, u8 xtal_trim)
1326 {
1327         int rc, irq_type, irq_pol = IRQ_ACTIVE_HIGH;
1328         unsigned int dvdd;
1329         u8 csma_seed[2];
1330
1331         rc = at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
1332         if (rc)
1333                 return rc;
1334
1335         irq_type = irq_get_trigger_type(lp->spi->irq);
1336         if (irq_type == IRQ_TYPE_EDGE_RISING ||
1337             irq_type == IRQ_TYPE_EDGE_FALLING)
1338                 dev_warn(&lp->spi->dev,
1339                          "Using edge triggered irq's are not recommended!\n");
1340         if (irq_type == IRQ_TYPE_EDGE_FALLING ||
1341             irq_type == IRQ_TYPE_LEVEL_LOW)
1342                 irq_pol = IRQ_ACTIVE_LOW;
1343
1344         rc = at86rf230_write_subreg(lp, SR_IRQ_POLARITY, irq_pol);
1345         if (rc)
1346                 return rc;
1347
1348         rc = at86rf230_write_subreg(lp, SR_RX_SAFE_MODE, 1);
1349         if (rc)
1350                 return rc;
1351
1352         rc = at86rf230_write_subreg(lp, SR_IRQ_MASK, IRQ_TRX_END);
1353         if (rc)
1354                 return rc;
1355
1356         /* reset values differs in at86rf231 and at86rf233 */
1357         rc = at86rf230_write_subreg(lp, SR_IRQ_MASK_MODE, 0);
1358         if (rc)
1359                 return rc;
1360
1361         get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
1362         rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
1363         if (rc)
1364                 return rc;
1365         rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
1366         if (rc)
1367                 return rc;
1368
1369         /* CLKM changes are applied immediately */
1370         rc = at86rf230_write_subreg(lp, SR_CLKM_SHA_SEL, 0x00);
1371         if (rc)
1372                 return rc;
1373
1374         /* Turn CLKM Off */
1375         rc = at86rf230_write_subreg(lp, SR_CLKM_CTRL, 0x00);
1376         if (rc)
1377                 return rc;
1378         /* Wait the next SLEEP cycle */
1379         usleep_range(lp->data->t_sleep_cycle,
1380                      lp->data->t_sleep_cycle + 100);
1381
1382         /* xtal_trim value is calculated by:
1383          * CL = 0.5 * (CX + CTRIM + CPAR)
1384          *
1385          * whereas:
1386          * CL = capacitor of used crystal
1387          * CX = connected capacitors at xtal pins
1388          * CPAR = in all at86rf2xx datasheets this is a constant value 3 pF,
1389          *        but this is different on each board setup. You need to fine
1390          *        tuning this value via CTRIM.
1391          * CTRIM = variable capacitor setting. Resolution is 0.3 pF range is
1392          *         0 pF upto 4.5 pF.
1393          *
1394          * Examples:
1395          * atben transceiver:
1396          *
1397          * CL = 8 pF
1398          * CX = 12 pF
1399          * CPAR = 3 pF (We assume the magic constant from datasheet)
1400          * CTRIM = 0.9 pF
1401          *
1402          * (12+0.9+3)/2 = 7.95 which is nearly at 8 pF
1403          *
1404          * xtal_trim = 0x3
1405          *
1406          * openlabs transceiver:
1407          *
1408          * CL = 16 pF
1409          * CX = 22 pF
1410          * CPAR = 3 pF (We assume the magic constant from datasheet)
1411          * CTRIM = 4.5 pF
1412          *
1413          * (22+4.5+3)/2 = 14.75 which is the nearest value to 16 pF
1414          *
1415          * xtal_trim = 0xf
1416          */
1417         rc = at86rf230_write_subreg(lp, SR_XTAL_TRIM, xtal_trim);
1418         if (rc)
1419                 return rc;
1420
1421         rc = at86rf230_read_subreg(lp, SR_DVDD_OK, &dvdd);
1422         if (rc)
1423                 return rc;
1424         if (!dvdd) {
1425                 dev_err(&lp->spi->dev, "DVDD error\n");
1426                 return -EINVAL;
1427         }
1428
1429         /* Force setting slotted operation bit to 0. Sometimes the atben
1430          * sets this bit and I don't know why. We set this always force
1431          * to zero while probing.
1432          */
1433         return at86rf230_write_subreg(lp, SR_SLOTTED_OPERATION, 0);
1434 }
1435
1436 static int
1437 at86rf230_get_pdata(struct spi_device *spi, int *rstn, int *slp_tr,
1438                     u8 *xtal_trim)
1439 {
1440         struct at86rf230_platform_data *pdata = spi->dev.platform_data;
1441         int ret;
1442
1443         if (!IS_ENABLED(CONFIG_OF) || !spi->dev.of_node) {
1444                 if (!pdata)
1445                         return -ENOENT;
1446
1447                 *rstn = pdata->rstn;
1448                 *slp_tr = pdata->slp_tr;
1449                 *xtal_trim = pdata->xtal_trim;
1450                 return 0;
1451         }
1452
1453         *rstn = of_get_named_gpio(spi->dev.of_node, "reset-gpio", 0);
1454         *slp_tr = of_get_named_gpio(spi->dev.of_node, "sleep-gpio", 0);
1455         ret = of_property_read_u8(spi->dev.of_node, "xtal-trim", xtal_trim);
1456         if (ret < 0 && ret != -EINVAL)
1457                 return ret;
1458
1459         return 0;
1460 }
1461
1462 static int
1463 at86rf230_detect_device(struct at86rf230_local *lp)
1464 {
1465         unsigned int part, version, val;
1466         u16 man_id = 0;
1467         const char *chip;
1468         int rc;
1469
1470         rc = __at86rf230_read(lp, RG_MAN_ID_0, &val);
1471         if (rc)
1472                 return rc;
1473         man_id |= val;
1474
1475         rc = __at86rf230_read(lp, RG_MAN_ID_1, &val);
1476         if (rc)
1477                 return rc;
1478         man_id |= (val << 8);
1479
1480         rc = __at86rf230_read(lp, RG_PART_NUM, &part);
1481         if (rc)
1482                 return rc;
1483
1484         rc = __at86rf230_read(lp, RG_VERSION_NUM, &version);
1485         if (rc)
1486                 return rc;
1487
1488         if (man_id != 0x001f) {
1489                 dev_err(&lp->spi->dev, "Non-Atmel dev found (MAN_ID %02x %02x)\n",
1490                         man_id >> 8, man_id & 0xFF);
1491                 return -EINVAL;
1492         }
1493
1494         lp->hw->flags = IEEE802154_HW_TX_OMIT_CKSUM |
1495                         IEEE802154_HW_CSMA_PARAMS |
1496                         IEEE802154_HW_FRAME_RETRIES | IEEE802154_HW_AFILT |
1497                         IEEE802154_HW_PROMISCUOUS;
1498
1499         lp->hw->phy->flags = WPAN_PHY_FLAG_TXPOWER |
1500                              WPAN_PHY_FLAG_CCA_ED_LEVEL |
1501                              WPAN_PHY_FLAG_CCA_MODE;
1502
1503         lp->hw->phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY) |
1504                 BIT(NL802154_CCA_CARRIER) | BIT(NL802154_CCA_ENERGY_CARRIER);
1505         lp->hw->phy->supported.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND) |
1506                 BIT(NL802154_CCA_OPT_ENERGY_CARRIER_OR);
1507
1508         lp->hw->phy->supported.cca_ed_levels = at86rf23x_ed_levels;
1509         lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf23x_ed_levels);
1510
1511         lp->hw->phy->cca.mode = NL802154_CCA_ENERGY;
1512
1513         switch (part) {
1514         case 2:
1515                 chip = "at86rf230";
1516                 rc = -ENOTSUPP;
1517                 goto not_supp;
1518         case 3:
1519                 chip = "at86rf231";
1520                 lp->data = &at86rf231_data;
1521                 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1522                 lp->hw->phy->current_channel = 11;
1523                 lp->hw->phy->symbol_duration = 16;
1524                 lp->hw->phy->supported.tx_powers = at86rf231_powers;
1525                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf231_powers);
1526                 break;
1527         case 7:
1528                 chip = "at86rf212";
1529                 lp->data = &at86rf212_data;
1530                 lp->hw->flags |= IEEE802154_HW_LBT;
1531                 lp->hw->phy->supported.channels[0] = 0x00007FF;
1532                 lp->hw->phy->supported.channels[2] = 0x00007FF;
1533                 lp->hw->phy->current_channel = 5;
1534                 lp->hw->phy->symbol_duration = 25;
1535                 lp->hw->phy->supported.lbt = NL802154_SUPPORTED_BOOL_BOTH;
1536                 lp->hw->phy->supported.tx_powers = at86rf212_powers;
1537                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf212_powers);
1538                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
1539                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
1540                 break;
1541         case 11:
1542                 chip = "at86rf233";
1543                 lp->data = &at86rf233_data;
1544                 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1545                 lp->hw->phy->current_channel = 13;
1546                 lp->hw->phy->symbol_duration = 16;
1547                 lp->hw->phy->supported.tx_powers = at86rf233_powers;
1548                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf233_powers);
1549                 break;
1550         default:
1551                 chip = "unknown";
1552                 rc = -ENOTSUPP;
1553                 goto not_supp;
1554         }
1555
1556         lp->hw->phy->cca_ed_level = lp->hw->phy->supported.cca_ed_levels[7];
1557         lp->hw->phy->transmit_power = lp->hw->phy->supported.tx_powers[0];
1558
1559 not_supp:
1560         dev_info(&lp->spi->dev, "Detected %s chip version %d\n", chip, version);
1561
1562         return rc;
1563 }
1564
1565 static void
1566 at86rf230_setup_spi_messages(struct at86rf230_local *lp)
1567 {
1568         lp->state.lp = lp;
1569         lp->state.irq = lp->spi->irq;
1570         spi_message_init(&lp->state.msg);
1571         lp->state.msg.context = &lp->state;
1572         lp->state.trx.len = 2;
1573         lp->state.trx.tx_buf = lp->state.buf;
1574         lp->state.trx.rx_buf = lp->state.buf;
1575         spi_message_add_tail(&lp->state.trx, &lp->state.msg);
1576         hrtimer_init(&lp->state.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1577         lp->state.timer.function = at86rf230_async_state_timer;
1578
1579         lp->irq.lp = lp;
1580         lp->irq.irq = lp->spi->irq;
1581         spi_message_init(&lp->irq.msg);
1582         lp->irq.msg.context = &lp->irq;
1583         lp->irq.trx.len = 2;
1584         lp->irq.trx.tx_buf = lp->irq.buf;
1585         lp->irq.trx.rx_buf = lp->irq.buf;
1586         spi_message_add_tail(&lp->irq.trx, &lp->irq.msg);
1587         hrtimer_init(&lp->irq.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1588         lp->irq.timer.function = at86rf230_async_state_timer;
1589
1590         lp->tx.lp = lp;
1591         lp->tx.irq = lp->spi->irq;
1592         spi_message_init(&lp->tx.msg);
1593         lp->tx.msg.context = &lp->tx;
1594         lp->tx.trx.len = 2;
1595         lp->tx.trx.tx_buf = lp->tx.buf;
1596         lp->tx.trx.rx_buf = lp->tx.buf;
1597         spi_message_add_tail(&lp->tx.trx, &lp->tx.msg);
1598         hrtimer_init(&lp->tx.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1599         lp->tx.timer.function = at86rf230_async_state_timer;
1600 }
1601
1602 static int at86rf230_probe(struct spi_device *spi)
1603 {
1604         struct ieee802154_hw *hw;
1605         struct at86rf230_local *lp;
1606         unsigned int status;
1607         int rc, irq_type, rstn, slp_tr;
1608         u8 xtal_trim = 0;
1609
1610         if (!spi->irq) {
1611                 dev_err(&spi->dev, "no IRQ specified\n");
1612                 return -EINVAL;
1613         }
1614
1615         rc = at86rf230_get_pdata(spi, &rstn, &slp_tr, &xtal_trim);
1616         if (rc < 0) {
1617                 dev_err(&spi->dev, "failed to parse platform_data: %d\n", rc);
1618                 return rc;
1619         }
1620
1621         if (gpio_is_valid(rstn)) {
1622                 rc = devm_gpio_request_one(&spi->dev, rstn,
1623                                            GPIOF_OUT_INIT_HIGH, "rstn");
1624                 if (rc)
1625                         return rc;
1626         }
1627
1628         if (gpio_is_valid(slp_tr)) {
1629                 rc = devm_gpio_request_one(&spi->dev, slp_tr,
1630                                            GPIOF_OUT_INIT_LOW, "slp_tr");
1631                 if (rc)
1632                         return rc;
1633         }
1634
1635         /* Reset */
1636         if (gpio_is_valid(rstn)) {
1637                 udelay(1);
1638                 gpio_set_value(rstn, 0);
1639                 udelay(1);
1640                 gpio_set_value(rstn, 1);
1641                 usleep_range(120, 240);
1642         }
1643
1644         hw = ieee802154_alloc_hw(sizeof(*lp), &at86rf230_ops);
1645         if (!hw)
1646                 return -ENOMEM;
1647
1648         lp = hw->priv;
1649         lp->hw = hw;
1650         lp->spi = spi;
1651         lp->slp_tr = slp_tr;
1652         hw->parent = &spi->dev;
1653         ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
1654
1655         lp->regmap = devm_regmap_init_spi(spi, &at86rf230_regmap_spi_config);
1656         if (IS_ERR(lp->regmap)) {
1657                 rc = PTR_ERR(lp->regmap);
1658                 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
1659                         rc);
1660                 goto free_dev;
1661         }
1662
1663         at86rf230_setup_spi_messages(lp);
1664
1665         rc = at86rf230_detect_device(lp);
1666         if (rc < 0)
1667                 goto free_dev;
1668
1669         init_completion(&lp->state_complete);
1670
1671         spi_set_drvdata(spi, lp);
1672
1673         rc = at86rf230_hw_init(lp, xtal_trim);
1674         if (rc)
1675                 goto free_dev;
1676
1677         /* Read irq status register to reset irq line */
1678         rc = at86rf230_read_subreg(lp, RG_IRQ_STATUS, 0xff, 0, &status);
1679         if (rc)
1680                 goto free_dev;
1681
1682         irq_type = irq_get_trigger_type(spi->irq);
1683         if (!irq_type)
1684                 irq_type = IRQF_TRIGGER_HIGH;
1685
1686         rc = devm_request_irq(&spi->dev, spi->irq, at86rf230_isr,
1687                               IRQF_SHARED | irq_type, dev_name(&spi->dev), lp);
1688         if (rc)
1689                 goto free_dev;
1690
1691         /* disable_irq by default and wait for starting hardware */
1692         disable_irq(spi->irq);
1693
1694         /* going into sleep by default */
1695         at86rf230_sleep(lp);
1696
1697         rc = ieee802154_register_hw(lp->hw);
1698         if (rc)
1699                 goto free_dev;
1700
1701         return rc;
1702
1703 free_dev:
1704         ieee802154_free_hw(lp->hw);
1705
1706         return rc;
1707 }
1708
1709 static int at86rf230_remove(struct spi_device *spi)
1710 {
1711         struct at86rf230_local *lp = spi_get_drvdata(spi);
1712
1713         /* mask all at86rf230 irq's */
1714         at86rf230_write_subreg(lp, SR_IRQ_MASK, 0);
1715         ieee802154_unregister_hw(lp->hw);
1716         ieee802154_free_hw(lp->hw);
1717         dev_dbg(&spi->dev, "unregistered at86rf230\n");
1718
1719         return 0;
1720 }
1721
1722 static const struct of_device_id at86rf230_of_match[] = {
1723         { .compatible = "atmel,at86rf230", },
1724         { .compatible = "atmel,at86rf231", },
1725         { .compatible = "atmel,at86rf233", },
1726         { .compatible = "atmel,at86rf212", },
1727         { },
1728 };
1729 MODULE_DEVICE_TABLE(of, at86rf230_of_match);
1730
1731 static const struct spi_device_id at86rf230_device_id[] = {
1732         { .name = "at86rf230", },
1733         { .name = "at86rf231", },
1734         { .name = "at86rf233", },
1735         { .name = "at86rf212", },
1736         { },
1737 };
1738 MODULE_DEVICE_TABLE(spi, at86rf230_device_id);
1739
1740 static struct spi_driver at86rf230_driver = {
1741         .id_table = at86rf230_device_id,
1742         .driver = {
1743                 .of_match_table = of_match_ptr(at86rf230_of_match),
1744                 .name   = "at86rf230",
1745                 .owner  = THIS_MODULE,
1746         },
1747         .probe      = at86rf230_probe,
1748         .remove     = at86rf230_remove,
1749 };
1750
1751 module_spi_driver(at86rf230_driver);
1752
1753 MODULE_DESCRIPTION("AT86RF230 Transceiver Driver");
1754 MODULE_LICENSE("GPL v2");