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