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         bool tx_aret;
 101         unsigned long cal_timeout;
 102         s8 max_frame_retries;
 103         bool is_tx;
 104         bool is_tx_from_off;
 105         u8 tx_retry;
 106         struct sk_buff *tx_skb;
 107         struct at86rf230_state_change tx;
 108 };
 109
 110 #define AT86RF2XX_NUMREGS 0x3F
 111
 112 static void
 113 at86rf230_async_state_change(struct at86rf230_local *lp,
 114                              struct at86rf230_state_change *ctx,
 115                              const u8 state, void (*complete)(void *context),
 116                              const bool irq_enable);
 117
 118 static inline void
 119 at86rf230_sleep(struct at86rf230_local *lp)
 120 {
 121         if (gpio_is_valid(lp->slp_tr)) {
 122                 gpio_set_value(lp->slp_tr, 1);
 123                 usleep_range(lp->data->t_off_to_sleep,
 124                              lp->data->t_off_to_sleep + 10);
 125                 lp->sleep = true;
 126         }
 127 }
 128
 129 static inline void
 130 at86rf230_awake(struct at86rf230_local *lp)
 131 {
 132         if (gpio_is_valid(lp->slp_tr)) {
 133                 gpio_set_value(lp->slp_tr, 0);
 134                 usleep_range(lp->data->t_sleep_to_off,
 135                              lp->data->t_sleep_to_off + 100);
 136                 lp->sleep = false;
 137         }
 138 }
 139
 140 static inline int
 141 __at86rf230_write(struct at86rf230_local *lp,
 142                   unsigned int addr, unsigned int data)
 143 {
 144         bool sleep = lp->sleep;
 145         int ret;
 146
 147         /* awake for register setting if sleep */
 148         if (sleep)
 149                 at86rf230_awake(lp);
 150
 151         ret = regmap_write(lp->regmap, addr, data);
 152
 153         /* sleep again if was sleeping */
 154         if (sleep)
 155                 at86rf230_sleep(lp);
 156
 157         return ret;
 158 }
 159
 160 static inline int
 161 __at86rf230_read(struct at86rf230_local *lp,
 162                  unsigned int addr, unsigned int *data)
 163 {
 164         bool sleep = lp->sleep;
 165         int ret;
 166
 167         /* awake for register setting if sleep */
 168         if (sleep)
 169                 at86rf230_awake(lp);
 170
 171         ret = regmap_read(lp->regmap, addr, data);
 172
 173         /* sleep again if was sleeping */
 174         if (sleep)
 175                 at86rf230_sleep(lp);
 176
 177         return ret;
 178 }
 179
 180 static inline int
 181 at86rf230_read_subreg(struct at86rf230_local *lp,
 182                       unsigned int addr, unsigned int mask,
 183                       unsigned int shift, unsigned int *data)
 184 {
 185         int rc;
 186
 187         rc = __at86rf230_read(lp, addr, data);
 188         if (!rc)
 189                 *data = (*data & mask) >> shift;
 190
 191         return rc;
 192 }
 193
 194 static inline int
 195 at86rf230_write_subreg(struct at86rf230_local *lp,
 196                        unsigned int addr, unsigned int mask,
 197                        unsigned int shift, unsigned int data)
 198 {
 199         bool sleep = lp->sleep;
 200         int ret;
 201
 202         /* awake for register setting if sleep */
 203         if (sleep)
 204                 at86rf230_awake(lp);
 205
 206         ret = regmap_update_bits(lp->regmap, addr, mask, data << shift);
 207
 208         /* sleep again if was sleeping */
 209         if (sleep)
 210                 at86rf230_sleep(lp);
 211
 212         return ret;
 213 }
 214
 215 static inline void
 216 at86rf230_slp_tr_rising_edge(struct at86rf230_local *lp)
 217 {
 218         gpio_set_value(lp->slp_tr, 1);
 219         udelay(1);
 220         gpio_set_value(lp->slp_tr, 0);
 221 }
 222
 223 static bool
 224 at86rf230_reg_writeable(struct device *dev, unsigned int reg)
 225 {
 226         switch (reg) {
 227         case RG_TRX_STATE:
 228         case RG_TRX_CTRL_0:
 229         case RG_TRX_CTRL_1:
 230         case RG_PHY_TX_PWR:
 231         case RG_PHY_ED_LEVEL:
 232         case RG_PHY_CC_CCA:
 233         case RG_CCA_THRES:
 234         case RG_RX_CTRL:
 235         case RG_SFD_VALUE:
 236         case RG_TRX_CTRL_2:
 237         case RG_ANT_DIV:
 238         case RG_IRQ_MASK:
 239         case RG_VREG_CTRL:
 240         case RG_BATMON:
 241         case RG_XOSC_CTRL:
 242         case RG_RX_SYN:
 243         case RG_XAH_CTRL_1:
 244         case RG_FTN_CTRL:
 245         case RG_PLL_CF:
 246         case RG_PLL_DCU:
 247         case RG_SHORT_ADDR_0:
 248         case RG_SHORT_ADDR_1:
 249         case RG_PAN_ID_0:
 250         case RG_PAN_ID_1:
 251         case RG_IEEE_ADDR_0:
 252         case RG_IEEE_ADDR_1:
 253         case RG_IEEE_ADDR_2:
 254         case RG_IEEE_ADDR_3:
 255         case RG_IEEE_ADDR_4:
 256         case RG_IEEE_ADDR_5:
 257         case RG_IEEE_ADDR_6:
 258         case RG_IEEE_ADDR_7:
 259         case RG_XAH_CTRL_0:
 260         case RG_CSMA_SEED_0:
 261         case RG_CSMA_SEED_1:
 262         case RG_CSMA_BE:
 263                 return true;
 264         default:
 265                 return false;
 266         }
 267 }
 268
 269 static bool
 270 at86rf230_reg_readable(struct device *dev, unsigned int reg)
 271 {
 272         bool rc;
 273
 274         /* all writeable are also readable */
 275         rc = at86rf230_reg_writeable(dev, reg);
 276         if (rc)
 277                 return rc;
 278
 279         /* readonly regs */
 280         switch (reg) {
 281         case RG_TRX_STATUS:
 282         case RG_PHY_RSSI:
 283         case RG_IRQ_STATUS:
 284         case RG_PART_NUM:
 285         case RG_VERSION_NUM:
 286         case RG_MAN_ID_1:
 287         case RG_MAN_ID_0:
 288                 return true;
 289         default:
 290                 return false;
 291         }
 292 }
 293
 294 static bool
 295 at86rf230_reg_volatile(struct device *dev, unsigned int reg)
 296 {
 297         /* can be changed during runtime */
 298         switch (reg) {
 299         case RG_TRX_STATUS:
 300         case RG_TRX_STATE:
 301         case RG_PHY_RSSI:
 302         case RG_PHY_ED_LEVEL:
 303         case RG_IRQ_STATUS:
 304         case RG_VREG_CTRL:
 305         case RG_PLL_CF:
 306         case RG_PLL_DCU:
 307                 return true;
 308         default:
 309                 return false;
 310         }
 311 }
 312
 313 static bool
 314 at86rf230_reg_precious(struct device *dev, unsigned int reg)
 315 {
 316         /* don't clear irq line on read */
 317         switch (reg) {
 318         case RG_IRQ_STATUS:
 319                 return true;
 320         default:
 321                 return false;
 322         }
 323 }
 324
 325 static const struct regmap_config at86rf230_regmap_spi_config = {
 326         .reg_bits = 8,
 327         .val_bits = 8,
 328         .write_flag_mask = CMD_REG | CMD_WRITE,
 329         .read_flag_mask = CMD_REG,
 330         .cache_type = REGCACHE_RBTREE,
 331         .max_register = AT86RF2XX_NUMREGS,
 332         .writeable_reg = at86rf230_reg_writeable,
 333         .readable_reg = at86rf230_reg_readable,
 334         .volatile_reg = at86rf230_reg_volatile,
 335         .precious_reg = at86rf230_reg_precious,
 336 };
 337
 338 static void
 339 at86rf230_async_error_recover(void *context)
 340 {
 341         struct at86rf230_state_change *ctx = context;
 342         struct at86rf230_local *lp = ctx->lp;
 343
 344         lp->is_tx = 0;
 345         at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON, NULL, false);
 346         ieee802154_wake_queue(lp->hw);
 347 }
 348
 349 static inline void
 350 at86rf230_async_error(struct at86rf230_local *lp,
 351                       struct at86rf230_state_change *ctx, int rc)
 352 {
 353         dev_err(&lp->spi->dev, "spi_async error %d\n", rc);
 354
 355         at86rf230_async_state_change(lp, ctx, STATE_FORCE_TRX_OFF,
 356                                      at86rf230_async_error_recover, false);
 357 }
 358
 359 /* Generic function to get some register value in async mode */
 360 static void
 361 at86rf230_async_read_reg(struct at86rf230_local *lp, const u8 reg,
 362                          struct at86rf230_state_change *ctx,
 363                          void (*complete)(void *context),
 364                          const bool irq_enable)
 365 {
 366         int rc;
 367
 368         u8 *tx_buf = ctx->buf;
 369
 370         tx_buf[0] = (reg & CMD_REG_MASK) | CMD_REG;
 371         ctx->msg.complete = complete;
 372         ctx->irq_enable = irq_enable;
 373         rc = spi_async(lp->spi, &ctx->msg);
 374         if (rc) {
 375                 if (irq_enable)
 376                         enable_irq(ctx->irq);
 377
 378                 at86rf230_async_error(lp, ctx, rc);
 379         }
 380 }
 381
 382 static inline u8 at86rf230_state_to_force(u8 state)
 383 {
 384         if (state == STATE_TX_ON)
 385                 return STATE_FORCE_TX_ON;
 386         else
 387                 return STATE_FORCE_TRX_OFF;
 388 }
 389
 390 static void
 391 at86rf230_async_state_assert(void *context)
 392 {
 393         struct at86rf230_state_change *ctx = context;
 394         struct at86rf230_local *lp = ctx->lp;
 395         const u8 *buf = ctx->buf;
 396         const u8 trx_state = buf[1] & TRX_STATE_MASK;
 397
 398         /* Assert state change */
 399         if (trx_state != ctx->to_state) {
 400                 /* Special handling if transceiver state is in
 401                  * STATE_BUSY_RX_AACK and a SHR was detected.
 402                  */
 403                 if  (trx_state == STATE_BUSY_RX_AACK) {
 404                         /* Undocumented race condition. If we send a state
 405                          * change to STATE_RX_AACK_ON the transceiver could
 406                          * change his state automatically to STATE_BUSY_RX_AACK
 407                          * if a SHR was detected. This is not an error, but we
 408                          * can't assert this.
 409                          */
 410                         if (ctx->to_state == STATE_RX_AACK_ON)
 411                                 goto done;
 412
 413                         /* If we change to STATE_TX_ON without forcing and
 414                          * transceiver state is STATE_BUSY_RX_AACK, we wait
 415                          * 'tFrame + tPAck' receiving time. In this time the
 416                          * PDU should be received. If the transceiver is still
 417                          * in STATE_BUSY_RX_AACK, we run a force state change
 418                          * to STATE_TX_ON. This is a timeout handling, if the
 419                          * transceiver stucks in STATE_BUSY_RX_AACK.
 420                          *
 421                          * Additional we do several retries to try to get into
 422                          * TX_ON state without forcing. If the retries are
 423                          * higher or equal than AT86RF2XX_MAX_TX_RETRIES we
 424                          * will do a force change.
 425                          */
 426                         if (ctx->to_state == STATE_TX_ON ||
 427                             ctx->to_state == STATE_TRX_OFF) {
 428                                 u8 state = ctx->to_state;
 429
 430                                 if (lp->tx_retry >= AT86RF2XX_MAX_TX_RETRIES)
 431                                         state = at86rf230_state_to_force(state);
 432                                 lp->tx_retry++;
 433
 434                                 at86rf230_async_state_change(lp, ctx, state,
 435                                                              ctx->complete,
 436                                                              ctx->irq_enable);
 437                                 return;
 438                         }
 439                 }
 440
 441                 dev_warn(&lp->spi->dev, "unexcept state change from 0x%02x to 0x%02x. Actual state: 0x%02x\n",
 442                          ctx->from_state, ctx->to_state, trx_state);
 443         }
 444
 445 done:
 446         if (ctx->complete)
 447                 ctx->complete(context);
 448 }
 449
 450 static enum hrtimer_restart at86rf230_async_state_timer(struct hrtimer *timer)
 451 {
 452         struct at86rf230_state_change *ctx =
 453                 container_of(timer, struct at86rf230_state_change, timer);
 454         struct at86rf230_local *lp = ctx->lp;
 455
 456         at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 457                                  at86rf230_async_state_assert,
 458                                  ctx->irq_enable);
 459
 460         return HRTIMER_NORESTART;
 461 }
 462
 463 /* Do state change timing delay. */
 464 static void
 465 at86rf230_async_state_delay(void *context)
 466 {
 467         struct at86rf230_state_change *ctx = context;
 468         struct at86rf230_local *lp = ctx->lp;
 469         struct at86rf2xx_chip_data *c = lp->data;
 470         bool force = false;
 471         ktime_t tim;
 472
 473         /* The force state changes are will show as normal states in the
 474          * state status subregister. We change the to_state to the
 475          * corresponding one and remember if it was a force change, this
 476          * differs if we do a state change from STATE_BUSY_RX_AACK.
 477          */
 478         switch (ctx->to_state) {
 479         case STATE_FORCE_TX_ON:
 480                 ctx->to_state = STATE_TX_ON;
 481                 force = true;
 482                 break;
 483         case STATE_FORCE_TRX_OFF:
 484                 ctx->to_state = STATE_TRX_OFF;
 485                 force = true;
 486                 break;
 487         default:
 488                 break;
 489         }
 490
 491         switch (ctx->from_state) {
 492         case STATE_TRX_OFF:
 493                 switch (ctx->to_state) {
 494                 case STATE_RX_AACK_ON:
 495                         tim = ktime_set(0, c->t_off_to_aack * NSEC_PER_USEC);
 496                         /* state change from TRX_OFF to RX_AACK_ON to do a
 497                          * calibration, we need to reset the timeout for the
 498                          * next one.
 499                          */
 500                         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
 501                         goto change;
 502                 case STATE_TX_ARET_ON:
 503                 case STATE_TX_ON:
 504                         tim = ktime_set(0, c->t_off_to_tx_on * NSEC_PER_USEC);
 505                         /* state change from TRX_OFF to TX_ON or ARET_ON to do
 506                          * a calibration, we need to reset the timeout for the
 507                          * next one.
 508                          */
 509                         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
 510                         goto change;
 511                 default:
 512                         break;
 513                 }
 514                 break;
 515         case STATE_BUSY_RX_AACK:
 516                 switch (ctx->to_state) {
 517                 case STATE_TRX_OFF:
 518                 case STATE_TX_ON:
 519                         /* Wait for worst case receiving time if we
 520                          * didn't make a force change from BUSY_RX_AACK
 521                          * to TX_ON or TRX_OFF.
 522                          */
 523                         if (!force) {
 524                                 tim = ktime_set(0, (c->t_frame + c->t_p_ack) *
 525                                                    NSEC_PER_USEC);
 526                                 goto change;
 527                         }
 528                         break;
 529                 default:
 530                         break;
 531                 }
 532                 break;
 533         /* Default value, means RESET state */
 534         case STATE_P_ON:
 535                 switch (ctx->to_state) {
 536                 case STATE_TRX_OFF:
 537                         tim = ktime_set(0, c->t_reset_to_off * NSEC_PER_USEC);
 538                         goto change;
 539                 default:
 540                         break;
 541                 }
 542                 break;
 543         default:
 544                 break;
 545         }
 546
 547         /* Default delay is 1us in the most cases */
 548         udelay(1);
 549         at86rf230_async_state_timer(&ctx->timer);
 550         return;
 551
 552 change:
 553         hrtimer_start(&ctx->timer, tim, HRTIMER_MODE_REL);
 554 }
 555
 556 static void
 557 at86rf230_async_state_change_start(void *context)
 558 {
 559         struct at86rf230_state_change *ctx = context;
 560         struct at86rf230_local *lp = ctx->lp;
 561         u8 *buf = ctx->buf;
 562         const u8 trx_state = buf[1] & TRX_STATE_MASK;
 563         int rc;
 564
 565         /* Check for "possible" STATE_TRANSITION_IN_PROGRESS */
 566         if (trx_state == STATE_TRANSITION_IN_PROGRESS) {
 567                 udelay(1);
 568                 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 569                                          at86rf230_async_state_change_start,
 570                                          ctx->irq_enable);
 571                 return;
 572         }
 573
 574         /* Check if we already are in the state which we change in */
 575         if (trx_state == ctx->to_state) {
 576                 if (ctx->complete)
 577                         ctx->complete(context);
 578                 return;
 579         }
 580
 581         /* Set current state to the context of state change */
 582         ctx->from_state = trx_state;
 583
 584         /* Going into the next step for a state change which do a timing
 585          * relevant delay.
 586          */
 587         buf[0] = (RG_TRX_STATE & CMD_REG_MASK) | CMD_REG | CMD_WRITE;
 588         buf[1] = ctx->to_state;
 589         ctx->msg.complete = at86rf230_async_state_delay;
 590         rc = spi_async(lp->spi, &ctx->msg);
 591         if (rc) {
 592                 if (ctx->irq_enable)
 593                         enable_irq(ctx->irq);
 594
 595                 at86rf230_async_error(lp, ctx, rc);
 596         }
 597 }
 598
 599 static void
 600 at86rf230_async_state_change(struct at86rf230_local *lp,
 601                              struct at86rf230_state_change *ctx,
 602                              const u8 state, void (*complete)(void *context),
 603                              const bool irq_enable)
 604 {
 605         /* Initialization for the state change context */
 606         ctx->to_state = state;
 607         ctx->complete = complete;
 608         ctx->irq_enable = irq_enable;
 609         at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
 610                                  at86rf230_async_state_change_start,
 611                                  irq_enable);
 612 }
 613
 614 static void
 615 at86rf230_sync_state_change_complete(void *context)
 616 {
 617         struct at86rf230_state_change *ctx = context;
 618         struct at86rf230_local *lp = ctx->lp;
 619
 620         complete(&lp->state_complete);
 621 }
 622
 623 /* This function do a sync framework above the async state change.
 624  * Some callbacks of the IEEE 802.15.4 driver interface need to be
 625  * handled synchronously.
 626  */
 627 static int
 628 at86rf230_sync_state_change(struct at86rf230_local *lp, unsigned int state)
 629 {
 630         unsigned long rc;
 631
 632         at86rf230_async_state_change(lp, &lp->state, state,
 633                                      at86rf230_sync_state_change_complete,
 634                                      false);
 635
 636         rc = wait_for_completion_timeout(&lp->state_complete,
 637                                          msecs_to_jiffies(100));
 638         if (!rc) {
 639                 at86rf230_async_error(lp, &lp->state, -ETIMEDOUT);
 640                 return -ETIMEDOUT;
 641         }
 642
 643         return 0;
 644 }
 645
 646 static void
 647 at86rf230_tx_complete(void *context)
 648 {
 649         struct at86rf230_state_change *ctx = context;
 650         struct at86rf230_local *lp = ctx->lp;
 651
 652         enable_irq(ctx->irq);
 653
 654         ieee802154_xmit_complete(lp->hw, lp->tx_skb, !lp->tx_aret);
 655 }
 656
 657 static void
 658 at86rf230_tx_on(void *context)
 659 {
 660         struct at86rf230_state_change *ctx = context;
 661         struct at86rf230_local *lp = ctx->lp;
 662
 663         at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON,
 664                                      at86rf230_tx_complete, true);
 665 }
 666
 667 static void
 668 at86rf230_tx_trac_check(void *context)
 669 {
 670         struct at86rf230_state_change *ctx = context;
 671         struct at86rf230_local *lp = ctx->lp;
 672         const u8 *buf = ctx->buf;
 673         const u8 trac = (buf[1] & 0xe0) >> 5;
 674
 675         /* If trac status is different than zero we need to do a state change
 676          * to STATE_FORCE_TRX_OFF then STATE_RX_AACK_ON to recover the
 677          * transceiver.
 678          */
 679         if (trac)
 680                 at86rf230_async_state_change(lp, ctx, STATE_FORCE_TRX_OFF,
 681                                              at86rf230_tx_on, true);
 682         else
 683                 at86rf230_tx_on(context);
 684 }
 685
 686 static void
 687 at86rf230_tx_trac_status(void *context)
 688 {
 689         struct at86rf230_state_change *ctx = context;
 690         struct at86rf230_local *lp = ctx->lp;
 691
 692         at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx,
 693                                  at86rf230_tx_trac_check, true);
 694 }
 695
 696 static void
 697 at86rf230_rx_read_frame_complete(void *context)
 698 {
 699         struct at86rf230_state_change *ctx = context;
 700         struct at86rf230_local *lp = ctx->lp;
 701         u8 rx_local_buf[AT86RF2XX_MAX_BUF];
 702         const u8 *buf = ctx->buf;
 703         struct sk_buff *skb;
 704         u8 len, lqi;
 705
 706         len = buf[1];
 707         if (!ieee802154_is_valid_psdu_len(len)) {
 708                 dev_vdbg(&lp->spi->dev, "corrupted frame received\n");
 709                 len = IEEE802154_MTU;
 710         }
 711         lqi = buf[2 + len];
 712
 713         memcpy(rx_local_buf, buf + 2, len);
 714         ctx->trx.len = 2;
 715         enable_irq(ctx->irq);
 716
 717         skb = dev_alloc_skb(IEEE802154_MTU);
 718         if (!skb) {
 719                 dev_vdbg(&lp->spi->dev, "failed to allocate sk_buff\n");
 720                 return;
 721         }
 722
 723         memcpy(skb_put(skb, len), rx_local_buf, len);
 724         ieee802154_rx_irqsafe(lp->hw, skb, lqi);
 725 }
 726
 727 static void
 728 at86rf230_rx_read_frame(void *context)
 729 {
 730         struct at86rf230_state_change *ctx = context;
 731         struct at86rf230_local *lp = ctx->lp;
 732         u8 *buf = ctx->buf;
 733         int rc;
 734
 735         buf[0] = CMD_FB;
 736         ctx->trx.len = AT86RF2XX_MAX_BUF;
 737         ctx->msg.complete = at86rf230_rx_read_frame_complete;
 738         rc = spi_async(lp->spi, &ctx->msg);
 739         if (rc) {
 740                 ctx->trx.len = 2;
 741                 enable_irq(ctx->irq);
 742                 at86rf230_async_error(lp, ctx, rc);
 743         }
 744 }
 745
 746 static void
 747 at86rf230_rx_trac_check(void *context)
 748 {
 749         /* Possible check on trac status here. This could be useful to make
 750          * some stats why receive is failed. Not used at the moment, but it's
 751          * maybe timing relevant. Datasheet doesn't say anything about this.
 752          * The programming guide say do it so.
 753          */
 754
 755         at86rf230_rx_read_frame(context);
 756 }
 757
 758 static void
 759 at86rf230_irq_trx_end(struct at86rf230_local *lp)
 760 {
 761         if (lp->is_tx) {
 762                 lp->is_tx = 0;
 763
 764                 if (lp->tx_aret)
 765                         at86rf230_async_state_change(lp, &lp->irq,
 766                                                      STATE_FORCE_TX_ON,
 767                                                      at86rf230_tx_trac_status,
 768                                                      true);
 769                 else
 770                         at86rf230_async_state_change(lp, &lp->irq,
 771                                                      STATE_RX_AACK_ON,
 772                                                      at86rf230_tx_complete,
 773                                                      true);
 774         } else {
 775                 at86rf230_async_read_reg(lp, RG_TRX_STATE, &lp->irq,
 776                                          at86rf230_rx_trac_check, true);
 777         }
 778 }
 779
 780 static void
 781 at86rf230_irq_status(void *context)
 782 {
 783         struct at86rf230_state_change *ctx = context;
 784         struct at86rf230_local *lp = ctx->lp;
 785         const u8 *buf = ctx->buf;
 786         const u8 irq = buf[1];
 787
 788         if (irq & IRQ_TRX_END) {
 789                 at86rf230_irq_trx_end(lp);
 790         } else {
 791                 enable_irq(ctx->irq);
 792                 dev_err(&lp->spi->dev, "not supported irq %02x received\n",
 793                         irq);
 794         }
 795 }
 796
 797 static irqreturn_t at86rf230_isr(int irq, void *data)
 798 {
 799         struct at86rf230_local *lp = data;
 800         struct at86rf230_state_change *ctx = &lp->irq;
 801         u8 *buf = ctx->buf;
 802         int rc;
 803
 804         disable_irq_nosync(irq);
 805
 806         buf[0] = (RG_IRQ_STATUS & CMD_REG_MASK) | CMD_REG;
 807         ctx->msg.complete = at86rf230_irq_status;
 808         rc = spi_async(lp->spi, &ctx->msg);
 809         if (rc) {
 810                 enable_irq(irq);
 811                 at86rf230_async_error(lp, ctx, rc);
 812                 return IRQ_NONE;
 813         }
 814
 815         return IRQ_HANDLED;
 816 }
 817
 818 static void
 819 at86rf230_write_frame_complete(void *context)
 820 {
 821         struct at86rf230_state_change *ctx = context;
 822         struct at86rf230_local *lp = ctx->lp;
 823         u8 *buf = ctx->buf;
 824         int rc;
 825
 826         ctx->trx.len = 2;
 827
 828         if (gpio_is_valid(lp->slp_tr)) {
 829                 at86rf230_slp_tr_rising_edge(lp);
 830         } else {
 831                 buf[0] = (RG_TRX_STATE & CMD_REG_MASK) | CMD_REG | CMD_WRITE;
 832                 buf[1] = STATE_BUSY_TX;
 833                 ctx->msg.complete = NULL;
 834                 rc = spi_async(lp->spi, &ctx->msg);
 835                 if (rc)
 836                         at86rf230_async_error(lp, ctx, rc);
 837         }
 838 }
 839
 840 static void
 841 at86rf230_write_frame(void *context)
 842 {
 843         struct at86rf230_state_change *ctx = context;
 844         struct at86rf230_local *lp = ctx->lp;
 845         struct sk_buff *skb = lp->tx_skb;
 846         u8 *buf = ctx->buf;
 847         int rc;
 848
 849         lp->is_tx = 1;
 850
 851         buf[0] = CMD_FB | CMD_WRITE;
 852         buf[1] = skb->len + 2;
 853         memcpy(buf + 2, skb->data, skb->len);
 854         ctx->trx.len = skb->len + 2;
 855         ctx->msg.complete = at86rf230_write_frame_complete;
 856         rc = spi_async(lp->spi, &ctx->msg);
 857         if (rc) {
 858                 ctx->trx.len = 2;
 859                 at86rf230_async_error(lp, ctx, rc);
 860         }
 861 }
 862
 863 static void
 864 at86rf230_xmit_tx_on(void *context)
 865 {
 866         struct at86rf230_state_change *ctx = context;
 867         struct at86rf230_local *lp = ctx->lp;
 868
 869         at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
 870                                      at86rf230_write_frame, false);
 871 }
 872
 873 static void
 874 at86rf230_xmit_start(void *context)
 875 {
 876         struct at86rf230_state_change *ctx = context;
 877         struct at86rf230_local *lp = ctx->lp;
 878
 879         /* In ARET mode we need to go into STATE_TX_ARET_ON after we
 880          * are in STATE_TX_ON. The pfad differs here, so we change
 881          * the complete handler.
 882          */
 883         if (lp->tx_aret) {
 884                 if (lp->is_tx_from_off) {
 885                         lp->is_tx_from_off = false;
 886                         at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
 887                                                      at86rf230_write_frame,
 888                                                      false);
 889                 } else {
 890                         at86rf230_async_state_change(lp, ctx, STATE_TX_ON,
 891                                                      at86rf230_xmit_tx_on,
 892                                                      false);
 893                 }
 894         } else {
 895                 at86rf230_async_state_change(lp, ctx, STATE_TX_ON,
 896                                              at86rf230_write_frame, false);
 897         }
 898 }
 899
 900 static int
 901 at86rf230_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
 902 {
 903         struct at86rf230_local *lp = hw->priv;
 904         struct at86rf230_state_change *ctx = &lp->tx;
 905
 906         lp->tx_skb = skb;
 907         lp->tx_retry = 0;
 908
 909         /* After 5 minutes in PLL and the same frequency we run again the
 910          * calibration loops which is recommended by at86rf2xx datasheets.
 911          *
 912          * The calibration is initiate by a state change from TRX_OFF
 913          * to TX_ON, the lp->cal_timeout should be reinit by state_delay
 914          * function then to start in the next 5 minutes.
 915          */
 916         if (time_is_before_jiffies(lp->cal_timeout)) {
 917                 lp->is_tx_from_off = true;
 918                 at86rf230_async_state_change(lp, ctx, STATE_TRX_OFF,
 919                                              at86rf230_xmit_start, false);
 920         } else {
 921                 at86rf230_xmit_start(ctx);
 922         }
 923
 924         return 0;
 925 }
 926
 927 static int
 928 at86rf230_ed(struct ieee802154_hw *hw, u8 *level)
 929 {
 930         BUG_ON(!level);
 931         *level = 0xbe;
 932         return 0;
 933 }
 934
 935 static int
 936 at86rf230_start(struct ieee802154_hw *hw)
 937 {
 938         struct at86rf230_local *lp = hw->priv;
 939
 940         at86rf230_awake(lp);
 941         enable_irq(lp->spi->irq);
 942
 943         return at86rf230_sync_state_change(lp, STATE_RX_AACK_ON);
 944 }
 945
 946 static void
 947 at86rf230_stop(struct ieee802154_hw *hw)
 948 {
 949         struct at86rf230_local *lp = hw->priv;
 950         u8 csma_seed[2];
 951
 952         at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
 953
 954         disable_irq(lp->spi->irq);
 955
 956         /* It's recommended to set random new csma_seeds before sleep state.
 957          * Makes only sense in the stop callback, not doing this inside of
 958          * at86rf230_sleep, this is also used when we don't transmit afterwards
 959          * when calling start callback again.
 960          */
 961         get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
 962         at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
 963         at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
 964
 965         at86rf230_sleep(lp);
 966 }
 967
 968 static int
 969 at86rf23x_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
 970 {
 971         return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
 972 }
 973
 974 #define AT86RF2XX_MAX_ED_LEVELS 0xF
 975 static const s32 at86rf23x_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = {
 976         -9100, -8900, -8700, -8500, -8300, -8100, -7900, -7700, -7500, -7300,
 977         -7100, -6900, -6700, -6500, -6300, -6100,
 978 };
 979
 980 static const s32 at86rf212_ed_levels_100[AT86RF2XX_MAX_ED_LEVELS + 1] = {
 981         -10000, -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200,
 982         -8000, -7800, -7600, -7400, -7200, -7000,
 983 };
 984
 985 static const s32 at86rf212_ed_levels_98[AT86RF2XX_MAX_ED_LEVELS + 1] = {
 986         -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000,
 987         -7800, -7600, -7400, -7200, -7000, -6800,
 988 };
 989
 990 static inline int
 991 at86rf212_update_cca_ed_level(struct at86rf230_local *lp, int rssi_base_val)
 992 {
 993         unsigned int cca_ed_thres;
 994         int rc;
 995
 996         rc = at86rf230_read_subreg(lp, SR_CCA_ED_THRES, &cca_ed_thres);
 997         if (rc < 0)
 998                 return rc;
 999
1000         switch (rssi_base_val) {
1001         case -98:
1002                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_98;
1003                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_98);
1004                 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_98[cca_ed_thres];
1005                 break;
1006         case -100:
1007                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
1008                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
1009                 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_100[cca_ed_thres];
1010                 break;
1011         default:
1012                 WARN_ON(1);
1013         }
1014
1015         return 0;
1016 }
1017
1018 static int
1019 at86rf212_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
1020 {
1021         int rc;
1022
1023         if (channel == 0)
1024                 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 0);
1025         else
1026                 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 1);
1027         if (rc < 0)
1028                 return rc;
1029
1030         if (page == 0) {
1031                 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 0);
1032                 lp->data->rssi_base_val = -100;
1033         } else {
1034                 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 1);
1035                 lp->data->rssi_base_val = -98;
1036         }
1037         if (rc < 0)
1038                 return rc;
1039
1040         rc = at86rf212_update_cca_ed_level(lp, lp->data->rssi_base_val);
1041         if (rc < 0)
1042                 return rc;
1043
1044         /* This sets the symbol_duration according frequency on the 212.
1045          * TODO move this handling while set channel and page in cfg802154.
1046          * We can do that, this timings are according 802.15.4 standard.
1047          * If we do that in cfg802154, this is a more generic calculation.
1048          *
1049          * This should also protected from ifs_timer. Means cancel timer and
1050          * init with a new value. For now, this is okay.
1051          */
1052         if (channel == 0) {
1053                 if (page == 0) {
1054                         /* SUB:0 and BPSK:0 -> BPSK-20 */
1055                         lp->hw->phy->symbol_duration = 50;
1056                 } else {
1057                         /* SUB:1 and BPSK:0 -> BPSK-40 */
1058                         lp->hw->phy->symbol_duration = 25;
1059                 }
1060         } else {
1061                 if (page == 0)
1062                         /* SUB:0 and BPSK:1 -> OQPSK-100/200/400 */
1063                         lp->hw->phy->symbol_duration = 40;
1064                 else
1065                         /* SUB:1 and BPSK:1 -> OQPSK-250/500/1000 */
1066                         lp->hw->phy->symbol_duration = 16;
1067         }
1068
1069         lp->hw->phy->lifs_period = IEEE802154_LIFS_PERIOD *
1070                                    lp->hw->phy->symbol_duration;
1071         lp->hw->phy->sifs_period = IEEE802154_SIFS_PERIOD *
1072                                    lp->hw->phy->symbol_duration;
1073
1074         return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
1075 }
1076
1077 static int
1078 at86rf230_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
1079 {
1080         struct at86rf230_local *lp = hw->priv;
1081         int rc;
1082
1083         rc = lp->data->set_channel(lp, page, channel);
1084         /* Wait for PLL */
1085         usleep_range(lp->data->t_channel_switch,
1086                      lp->data->t_channel_switch + 10);
1087
1088         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
1089         return rc;
1090 }
1091
1092 static int
1093 at86rf230_set_hw_addr_filt(struct ieee802154_hw *hw,
1094                            struct ieee802154_hw_addr_filt *filt,
1095                            unsigned long changed)
1096 {
1097         struct at86rf230_local *lp = hw->priv;
1098
1099         if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
1100                 u16 addr = le16_to_cpu(filt->short_addr);
1101
1102                 dev_vdbg(&lp->spi->dev,
1103                          "at86rf230_set_hw_addr_filt called for saddr\n");
1104                 __at86rf230_write(lp, RG_SHORT_ADDR_0, addr);
1105                 __at86rf230_write(lp, RG_SHORT_ADDR_1, addr >> 8);
1106         }
1107
1108         if (changed & IEEE802154_AFILT_PANID_CHANGED) {
1109                 u16 pan = le16_to_cpu(filt->pan_id);
1110
1111                 dev_vdbg(&lp->spi->dev,
1112                          "at86rf230_set_hw_addr_filt called for pan id\n");
1113                 __at86rf230_write(lp, RG_PAN_ID_0, pan);
1114                 __at86rf230_write(lp, RG_PAN_ID_1, pan >> 8);
1115         }
1116
1117         if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
1118                 u8 i, addr[8];
1119
1120                 memcpy(addr, &filt->ieee_addr, 8);
1121                 dev_vdbg(&lp->spi->dev,
1122                          "at86rf230_set_hw_addr_filt called for IEEE addr\n");
1123                 for (i = 0; i < 8; i++)
1124                         __at86rf230_write(lp, RG_IEEE_ADDR_0 + i, addr[i]);
1125         }
1126
1127         if (changed & IEEE802154_AFILT_PANC_CHANGED) {
1128                 dev_vdbg(&lp->spi->dev,
1129                          "at86rf230_set_hw_addr_filt called for panc change\n");
1130                 if (filt->pan_coord)
1131                         at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 1);
1132                 else
1133                         at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 0);
1134         }
1135
1136         return 0;
1137 }
1138
1139 #define AT86RF23X_MAX_TX_POWERS 0xF
1140 static const s32 at86rf233_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1141         400, 370, 340, 300, 250, 200, 100, 0, -100, -200, -300, -400, -600,
1142         -800, -1200, -1700,
1143 };
1144
1145 static const s32 at86rf231_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1146         300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700,
1147         -900, -1200, -1700,
1148 };
1149
1150 #define AT86RF212_MAX_TX_POWERS 0x1F
1151 static const s32 at86rf212_powers[AT86RF212_MAX_TX_POWERS + 1] = {
1152         500, 400, 300, 200, 100, 0, -100, -200, -300, -400, -500, -600, -700,
1153         -800, -900, -1000, -1100, -1200, -1300, -1400, -1500, -1600, -1700,
1154         -1800, -1900, -2000, -2100, -2200, -2300, -2400, -2500, -2600,
1155 };
1156
1157 static int
1158 at86rf23x_set_txpower(struct at86rf230_local *lp, s32 mbm)
1159 {
1160         u32 i;
1161
1162         for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1163                 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1164                         return at86rf230_write_subreg(lp, SR_TX_PWR_23X, i);
1165         }
1166
1167         return -EINVAL;
1168 }
1169
1170 static int
1171 at86rf212_set_txpower(struct at86rf230_local *lp, s32 mbm)
1172 {
1173         u32 i;
1174
1175         for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1176                 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1177                         return at86rf230_write_subreg(lp, SR_TX_PWR_212, i);
1178         }
1179
1180         return -EINVAL;
1181 }
1182
1183 static int
1184 at86rf230_set_txpower(struct ieee802154_hw *hw, s32 mbm)
1185 {
1186         struct at86rf230_local *lp = hw->priv;
1187
1188         return lp->data->set_txpower(lp, mbm);
1189 }
1190
1191 static int
1192 at86rf230_set_lbt(struct ieee802154_hw *hw, bool on)
1193 {
1194         struct at86rf230_local *lp = hw->priv;
1195
1196         return at86rf230_write_subreg(lp, SR_CSMA_LBT_MODE, on);
1197 }
1198
1199 static int
1200 at86rf230_set_cca_mode(struct ieee802154_hw *hw,
1201                        const struct wpan_phy_cca *cca)
1202 {
1203         struct at86rf230_local *lp = hw->priv;
1204         u8 val;
1205
1206         /* mapping 802.15.4 to driver spec */
1207         switch (cca->mode) {
1208         case NL802154_CCA_ENERGY:
1209                 val = 1;
1210                 break;
1211         case NL802154_CCA_CARRIER:
1212                 val = 2;
1213                 break;
1214         case NL802154_CCA_ENERGY_CARRIER:
1215                 switch (cca->opt) {
1216                 case NL802154_CCA_OPT_ENERGY_CARRIER_AND:
1217                         val = 3;
1218                         break;
1219                 case NL802154_CCA_OPT_ENERGY_CARRIER_OR:
1220                         val = 0;
1221                         break;
1222                 default:
1223                         return -EINVAL;
1224                 }
1225                 break;
1226         default:
1227                 return -EINVAL;
1228         }
1229
1230         return at86rf230_write_subreg(lp, SR_CCA_MODE, val);
1231 }
1232
1233
1234 static int
1235 at86rf230_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
1236 {
1237         struct at86rf230_local *lp = hw->priv;
1238         u32 i;
1239
1240         for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) {
1241                 if (hw->phy->supported.cca_ed_levels[i] == mbm)
1242                         return at86rf230_write_subreg(lp, SR_CCA_ED_THRES, i);
1243         }
1244
1245         return -EINVAL;
1246 }
1247
1248 static int
1249 at86rf230_set_csma_params(struct ieee802154_hw *hw, u8 min_be, u8 max_be,
1250                           u8 retries)
1251 {
1252         struct at86rf230_local *lp = hw->priv;
1253         int rc;
1254
1255         rc = at86rf230_write_subreg(lp, SR_MIN_BE, min_be);
1256         if (rc)
1257                 return rc;
1258
1259         rc = at86rf230_write_subreg(lp, SR_MAX_BE, max_be);
1260         if (rc)
1261                 return rc;
1262
1263         return at86rf230_write_subreg(lp, SR_MAX_CSMA_RETRIES, retries);
1264 }
1265
1266 static int
1267 at86rf230_set_frame_retries(struct ieee802154_hw *hw, s8 retries)
1268 {
1269         struct at86rf230_local *lp = hw->priv;
1270         int rc = 0;
1271
1272         lp->tx_aret = retries >= 0;
1273         lp->max_frame_retries = retries;
1274
1275         if (retries >= 0)
1276                 rc = at86rf230_write_subreg(lp, SR_MAX_FRAME_RETRIES, retries);
1277
1278         return rc;
1279 }
1280
1281 static int
1282 at86rf230_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
1283 {
1284         struct at86rf230_local *lp = hw->priv;
1285         int rc;
1286
1287         if (on) {
1288                 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 1);
1289                 if (rc < 0)
1290                         return rc;
1291
1292                 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 1);
1293                 if (rc < 0)
1294                         return rc;
1295         } else {
1296                 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 0);
1297                 if (rc < 0)
1298                         return rc;
1299
1300                 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 0);
1301                 if (rc < 0)
1302                         return rc;
1303         }
1304
1305         return 0;
1306 }
1307
1308 static const struct ieee802154_ops at86rf230_ops = {
1309         .owner = THIS_MODULE,
1310         .xmit_async = at86rf230_xmit,
1311         .ed = at86rf230_ed,
1312         .set_channel = at86rf230_channel,
1313         .start = at86rf230_start,
1314         .stop = at86rf230_stop,
1315         .set_hw_addr_filt = at86rf230_set_hw_addr_filt,
1316         .set_txpower = at86rf230_set_txpower,
1317         .set_lbt = at86rf230_set_lbt,
1318         .set_cca_mode = at86rf230_set_cca_mode,
1319         .set_cca_ed_level = at86rf230_set_cca_ed_level,
1320         .set_csma_params = at86rf230_set_csma_params,
1321         .set_frame_retries = at86rf230_set_frame_retries,
1322         .set_promiscuous_mode = at86rf230_set_promiscuous_mode,
1323 };
1324
1325 static struct at86rf2xx_chip_data at86rf233_data = {
1326         .t_sleep_cycle = 330,
1327         .t_channel_switch = 11,
1328         .t_reset_to_off = 26,
1329         .t_off_to_aack = 80,
1330         .t_off_to_tx_on = 80,
1331         .t_off_to_sleep = 35,
1332         .t_sleep_to_off = 210,
1333         .t_frame = 4096,
1334         .t_p_ack = 545,
1335         .rssi_base_val = -91,
1336         .set_channel = at86rf23x_set_channel,
1337         .set_txpower = at86rf23x_set_txpower,
1338 };
1339
1340 static struct at86rf2xx_chip_data at86rf231_data = {
1341         .t_sleep_cycle = 330,
1342         .t_channel_switch = 24,
1343         .t_reset_to_off = 37,
1344         .t_off_to_aack = 110,
1345         .t_off_to_tx_on = 110,
1346         .t_off_to_sleep = 35,
1347         .t_sleep_to_off = 380,
1348         .t_frame = 4096,
1349         .t_p_ack = 545,
1350         .rssi_base_val = -91,
1351         .set_channel = at86rf23x_set_channel,
1352         .set_txpower = at86rf23x_set_txpower,
1353 };
1354
1355 static struct at86rf2xx_chip_data at86rf212_data = {
1356         .t_sleep_cycle = 330,
1357         .t_channel_switch = 11,
1358         .t_reset_to_off = 26,
1359         .t_off_to_aack = 200,
1360         .t_off_to_tx_on = 200,
1361         .t_off_to_sleep = 35,
1362         .t_sleep_to_off = 380,
1363         .t_frame = 4096,
1364         .t_p_ack = 545,
1365         .rssi_base_val = -100,
1366         .set_channel = at86rf212_set_channel,
1367         .set_txpower = at86rf212_set_txpower,
1368 };
1369
1370 static int at86rf230_hw_init(struct at86rf230_local *lp, u8 xtal_trim)
1371 {
1372         int rc, irq_type, irq_pol = IRQ_ACTIVE_HIGH;
1373         unsigned int dvdd;
1374         u8 csma_seed[2];
1375
1376         rc = at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
1377         if (rc)
1378                 return rc;
1379
1380         irq_type = irq_get_trigger_type(lp->spi->irq);
1381         if (irq_type == IRQ_TYPE_EDGE_RISING ||
1382             irq_type == IRQ_TYPE_EDGE_FALLING)
1383                 dev_warn(&lp->spi->dev,
1384                          "Using edge triggered irq's are not recommended!\n");
1385         if (irq_type == IRQ_TYPE_EDGE_FALLING ||
1386             irq_type == IRQ_TYPE_LEVEL_LOW)
1387                 irq_pol = IRQ_ACTIVE_LOW;
1388
1389         rc = at86rf230_write_subreg(lp, SR_IRQ_POLARITY, irq_pol);
1390         if (rc)
1391                 return rc;
1392
1393         rc = at86rf230_write_subreg(lp, SR_RX_SAFE_MODE, 1);
1394         if (rc)
1395                 return rc;
1396
1397         rc = at86rf230_write_subreg(lp, SR_IRQ_MASK, IRQ_TRX_END);
1398         if (rc)
1399                 return rc;
1400
1401         /* reset values differs in at86rf231 and at86rf233 */
1402         rc = at86rf230_write_subreg(lp, SR_IRQ_MASK_MODE, 0);
1403         if (rc)
1404                 return rc;
1405
1406         get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
1407         rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
1408         if (rc)
1409                 return rc;
1410         rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
1411         if (rc)
1412                 return rc;
1413
1414         /* CLKM changes are applied immediately */
1415         rc = at86rf230_write_subreg(lp, SR_CLKM_SHA_SEL, 0x00);
1416         if (rc)
1417                 return rc;
1418
1419         /* Turn CLKM Off */
1420         rc = at86rf230_write_subreg(lp, SR_CLKM_CTRL, 0x00);
1421         if (rc)
1422                 return rc;
1423         /* Wait the next SLEEP cycle */
1424         usleep_range(lp->data->t_sleep_cycle,
1425                      lp->data->t_sleep_cycle + 100);
1426
1427         /* xtal_trim value is calculated by:
1428          * CL = 0.5 * (CX + CTRIM + CPAR)
1429          *
1430          * whereas:
1431          * CL = capacitor of used crystal
1432          * CX = connected capacitors at xtal pins
1433          * CPAR = in all at86rf2xx datasheets this is a constant value 3 pF,
1434          *        but this is different on each board setup. You need to fine
1435          *        tuning this value via CTRIM.
1436          * CTRIM = variable capacitor setting. Resolution is 0.3 pF range is
1437          *         0 pF upto 4.5 pF.
1438          *
1439          * Examples:
1440          * atben transceiver:
1441          *
1442          * CL = 8 pF
1443          * CX = 12 pF
1444          * CPAR = 3 pF (We assume the magic constant from datasheet)
1445          * CTRIM = 0.9 pF
1446          *
1447          * (12+0.9+3)/2 = 7.95 which is nearly at 8 pF
1448          *
1449          * xtal_trim = 0x3
1450          *
1451          * openlabs transceiver:
1452          *
1453          * CL = 16 pF
1454          * CX = 22 pF
1455          * CPAR = 3 pF (We assume the magic constant from datasheet)
1456          * CTRIM = 4.5 pF
1457          *
1458          * (22+4.5+3)/2 = 14.75 which is the nearest value to 16 pF
1459          *
1460          * xtal_trim = 0xf
1461          */
1462         rc = at86rf230_write_subreg(lp, SR_XTAL_TRIM, xtal_trim);
1463         if (rc)
1464                 return rc;
1465
1466         rc = at86rf230_read_subreg(lp, SR_DVDD_OK, &dvdd);
1467         if (rc)
1468                 return rc;
1469         if (!dvdd) {
1470                 dev_err(&lp->spi->dev, "DVDD error\n");
1471                 return -EINVAL;
1472         }
1473
1474         /* Force setting slotted operation bit to 0. Sometimes the atben
1475          * sets this bit and I don't know why. We set this always force
1476          * to zero while probing.
1477          */
1478         return at86rf230_write_subreg(lp, SR_SLOTTED_OPERATION, 0);
1479 }
1480
1481 static int
1482 at86rf230_get_pdata(struct spi_device *spi, int *rstn, int *slp_tr,
1483                     u8 *xtal_trim)
1484 {
1485         struct at86rf230_platform_data *pdata = spi->dev.platform_data;
1486         int ret;
1487
1488         if (!IS_ENABLED(CONFIG_OF) || !spi->dev.of_node) {
1489                 if (!pdata)
1490                         return -ENOENT;
1491
1492                 *rstn = pdata->rstn;
1493                 *slp_tr = pdata->slp_tr;
1494                 *xtal_trim = pdata->xtal_trim;
1495                 return 0;
1496         }
1497
1498         *rstn = of_get_named_gpio(spi->dev.of_node, "reset-gpio", 0);
1499         *slp_tr = of_get_named_gpio(spi->dev.of_node, "sleep-gpio", 0);
1500         ret = of_property_read_u8(spi->dev.of_node, "xtal-trim", xtal_trim);
1501         if (ret < 0 && ret != -EINVAL)
1502                 return ret;
1503
1504         return 0;
1505 }
1506
1507 static int
1508 at86rf230_detect_device(struct at86rf230_local *lp)
1509 {
1510         unsigned int part, version, val;
1511         u16 man_id = 0;
1512         const char *chip;
1513         int rc;
1514
1515         rc = __at86rf230_read(lp, RG_MAN_ID_0, &val);
1516         if (rc)
1517                 return rc;
1518         man_id |= val;
1519
1520         rc = __at86rf230_read(lp, RG_MAN_ID_1, &val);
1521         if (rc)
1522                 return rc;
1523         man_id |= (val << 8);
1524
1525         rc = __at86rf230_read(lp, RG_PART_NUM, &part);
1526         if (rc)
1527                 return rc;
1528
1529         rc = __at86rf230_read(lp, RG_VERSION_NUM, &version);
1530         if (rc)
1531                 return rc;
1532
1533         if (man_id != 0x001f) {
1534                 dev_err(&lp->spi->dev, "Non-Atmel dev found (MAN_ID %02x %02x)\n",
1535                         man_id >> 8, man_id & 0xFF);
1536                 return -EINVAL;
1537         }
1538
1539         lp->hw->flags = IEEE802154_HW_TX_OMIT_CKSUM |
1540                         IEEE802154_HW_CSMA_PARAMS |
1541                         IEEE802154_HW_FRAME_RETRIES | IEEE802154_HW_AFILT |
1542                         IEEE802154_HW_PROMISCUOUS;
1543
1544         lp->hw->phy->flags = WPAN_PHY_FLAG_TXPOWER |
1545                              WPAN_PHY_FLAG_CCA_ED_LEVEL |
1546                              WPAN_PHY_FLAG_CCA_MODE;
1547
1548         lp->hw->phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY) |
1549                 BIT(NL802154_CCA_CARRIER) | BIT(NL802154_CCA_ENERGY_CARRIER);
1550         lp->hw->phy->supported.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND) |
1551                 BIT(NL802154_CCA_OPT_ENERGY_CARRIER_OR);
1552
1553         lp->hw->phy->supported.cca_ed_levels = at86rf23x_ed_levels;
1554         lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf23x_ed_levels);
1555
1556         lp->hw->phy->cca.mode = NL802154_CCA_ENERGY;
1557
1558         switch (part) {
1559         case 2:
1560                 chip = "at86rf230";
1561                 rc = -ENOTSUPP;
1562                 goto not_supp;
1563         case 3:
1564                 chip = "at86rf231";
1565                 lp->data = &at86rf231_data;
1566                 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1567                 lp->hw->phy->current_channel = 11;
1568                 lp->hw->phy->symbol_duration = 16;
1569                 lp->hw->phy->supported.tx_powers = at86rf231_powers;
1570                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf231_powers);
1571                 break;
1572         case 7:
1573                 chip = "at86rf212";
1574                 lp->data = &at86rf212_data;
1575                 lp->hw->flags |= IEEE802154_HW_LBT;
1576                 lp->hw->phy->supported.channels[0] = 0x00007FF;
1577                 lp->hw->phy->supported.channels[2] = 0x00007FF;
1578                 lp->hw->phy->current_channel = 5;
1579                 lp->hw->phy->symbol_duration = 25;
1580                 lp->hw->phy->supported.lbt = NL802154_SUPPORTED_BOOL_BOTH;
1581                 lp->hw->phy->supported.tx_powers = at86rf212_powers;
1582                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf212_powers);
1583                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
1584                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
1585                 break;
1586         case 11:
1587                 chip = "at86rf233";
1588                 lp->data = &at86rf233_data;
1589                 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1590                 lp->hw->phy->current_channel = 13;
1591                 lp->hw->phy->symbol_duration = 16;
1592                 lp->hw->phy->supported.tx_powers = at86rf233_powers;
1593                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf233_powers);
1594                 break;
1595         default:
1596                 chip = "unknown";
1597                 rc = -ENOTSUPP;
1598                 goto not_supp;
1599         }
1600
1601         lp->hw->phy->cca_ed_level = lp->hw->phy->supported.cca_ed_levels[7];
1602         lp->hw->phy->transmit_power = lp->hw->phy->supported.tx_powers[0];
1603
1604 not_supp:
1605         dev_info(&lp->spi->dev, "Detected %s chip version %d\n", chip, version);
1606
1607         return rc;
1608 }
1609
1610 static void
1611 at86rf230_setup_spi_messages(struct at86rf230_local *lp)
1612 {
1613         lp->state.lp = lp;
1614         lp->state.irq = lp->spi->irq;
1615         spi_message_init(&lp->state.msg);
1616         lp->state.msg.context = &lp->state;
1617         lp->state.trx.len = 2;
1618         lp->state.trx.tx_buf = lp->state.buf;
1619         lp->state.trx.rx_buf = lp->state.buf;
1620         spi_message_add_tail(&lp->state.trx, &lp->state.msg);
1621         hrtimer_init(&lp->state.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1622         lp->state.timer.function = at86rf230_async_state_timer;
1623
1624         lp->irq.lp = lp;
1625         lp->irq.irq = lp->spi->irq;
1626         spi_message_init(&lp->irq.msg);
1627         lp->irq.msg.context = &lp->irq;
1628         lp->irq.trx.len = 2;
1629         lp->irq.trx.tx_buf = lp->irq.buf;
1630         lp->irq.trx.rx_buf = lp->irq.buf;
1631         spi_message_add_tail(&lp->irq.trx, &lp->irq.msg);
1632         hrtimer_init(&lp->irq.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1633         lp->irq.timer.function = at86rf230_async_state_timer;
1634
1635         lp->tx.lp = lp;
1636         lp->tx.irq = lp->spi->irq;
1637         spi_message_init(&lp->tx.msg);
1638         lp->tx.msg.context = &lp->tx;
1639         lp->tx.trx.len = 2;
1640         lp->tx.trx.tx_buf = lp->tx.buf;
1641         lp->tx.trx.rx_buf = lp->tx.buf;
1642         spi_message_add_tail(&lp->tx.trx, &lp->tx.msg);
1643         hrtimer_init(&lp->tx.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1644         lp->tx.timer.function = at86rf230_async_state_timer;
1645 }
1646
1647 static int at86rf230_probe(struct spi_device *spi)
1648 {
1649         struct ieee802154_hw *hw;
1650         struct at86rf230_local *lp;
1651         unsigned int status;
1652         int rc, irq_type, rstn, slp_tr;
1653         u8 xtal_trim = 0;
1654
1655         if (!spi->irq) {
1656                 dev_err(&spi->dev, "no IRQ specified\n");
1657                 return -EINVAL;
1658         }
1659
1660         rc = at86rf230_get_pdata(spi, &rstn, &slp_tr, &xtal_trim);
1661         if (rc < 0) {
1662                 dev_err(&spi->dev, "failed to parse platform_data: %d\n", rc);
1663                 return rc;
1664         }
1665
1666         if (gpio_is_valid(rstn)) {
1667                 rc = devm_gpio_request_one(&spi->dev, rstn,
1668                                            GPIOF_OUT_INIT_HIGH, "rstn");
1669                 if (rc)
1670                         return rc;
1671         }
1672
1673         if (gpio_is_valid(slp_tr)) {
1674                 rc = devm_gpio_request_one(&spi->dev, slp_tr,
1675                                            GPIOF_OUT_INIT_LOW, "slp_tr");
1676                 if (rc)
1677                         return rc;
1678         }
1679
1680         /* Reset */
1681         if (gpio_is_valid(rstn)) {
1682                 udelay(1);
1683                 gpio_set_value(rstn, 0);
1684                 udelay(1);
1685                 gpio_set_value(rstn, 1);
1686                 usleep_range(120, 240);
1687         }
1688
1689         hw = ieee802154_alloc_hw(sizeof(*lp), &at86rf230_ops);
1690         if (!hw)
1691                 return -ENOMEM;
1692
1693         lp = hw->priv;
1694         lp->hw = hw;
1695         lp->spi = spi;
1696         lp->slp_tr = slp_tr;
1697         hw->parent = &spi->dev;
1698         ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
1699
1700         lp->regmap = devm_regmap_init_spi(spi, &at86rf230_regmap_spi_config);
1701         if (IS_ERR(lp->regmap)) {
1702                 rc = PTR_ERR(lp->regmap);
1703                 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
1704                         rc);
1705                 goto free_dev;
1706         }
1707
1708         at86rf230_setup_spi_messages(lp);
1709
1710         rc = at86rf230_detect_device(lp);
1711         if (rc < 0)
1712                 goto free_dev;
1713
1714         init_completion(&lp->state_complete);
1715
1716         spi_set_drvdata(spi, lp);
1717
1718         rc = at86rf230_hw_init(lp, xtal_trim);
1719         if (rc)
1720                 goto free_dev;
1721
1722         /* Read irq status register to reset irq line */
1723         rc = at86rf230_read_subreg(lp, RG_IRQ_STATUS, 0xff, 0, &status);
1724         if (rc)
1725                 goto free_dev;
1726
1727         irq_type = irq_get_trigger_type(spi->irq);
1728         if (!irq_type)
1729                 irq_type = IRQF_TRIGGER_HIGH;
1730
1731         rc = devm_request_irq(&spi->dev, spi->irq, at86rf230_isr,
1732                               IRQF_SHARED | irq_type, dev_name(&spi->dev), lp);
1733         if (rc)
1734                 goto free_dev;
1735
1736         /* disable_irq by default and wait for starting hardware */
1737         disable_irq(spi->irq);
1738
1739         /* going into sleep by default */
1740         at86rf230_sleep(lp);
1741
1742         rc = ieee802154_register_hw(lp->hw);
1743         if (rc)
1744                 goto free_dev;
1745
1746         return rc;
1747
1748 free_dev:
1749         ieee802154_free_hw(lp->hw);
1750
1751         return rc;
1752 }
1753
1754 static int at86rf230_remove(struct spi_device *spi)
1755 {
1756         struct at86rf230_local *lp = spi_get_drvdata(spi);
1757
1758         /* mask all at86rf230 irq's */
1759         at86rf230_write_subreg(lp, SR_IRQ_MASK, 0);
1760         ieee802154_unregister_hw(lp->hw);
1761         ieee802154_free_hw(lp->hw);
1762         dev_dbg(&spi->dev, "unregistered at86rf230\n");
1763
1764         return 0;
1765 }
1766
1767 static const struct of_device_id at86rf230_of_match[] = {
1768         { .compatible = "atmel,at86rf230", },
1769         { .compatible = "atmel,at86rf231", },
1770         { .compatible = "atmel,at86rf233", },
1771         { .compatible = "atmel,at86rf212", },
1772         { },
1773 };
1774 MODULE_DEVICE_TABLE(of, at86rf230_of_match);
1775
1776 static const struct spi_device_id at86rf230_device_id[] = {
1777         { .name = "at86rf230", },
1778         { .name = "at86rf231", },
1779         { .name = "at86rf233", },
1780         { .name = "at86rf212", },
1781         { },
1782 };
1783 MODULE_DEVICE_TABLE(spi, at86rf230_device_id);
1784
1785 static struct spi_driver at86rf230_driver = {
1786         .id_table = at86rf230_device_id,
1787         .driver = {
1788                 .of_match_table = of_match_ptr(at86rf230_of_match),
1789                 .name   = "at86rf230",
1790                 .owner  = THIS_MODULE,
1791         },
1792         .probe      = at86rf230_probe,
1793         .remove     = at86rf230_remove,
1794 };
1795
1796 module_spi_driver(at86rf230_driver);
1797
1798 MODULE_DESCRIPTION("AT86RF230 Transceiver Driver");
1799 MODULE_LICENSE("GPL v2");