Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/drivers/net/ieee802154/at86rf230.c

  1 /*
  2  * AT86RF230/RF231 driver
  3  *
  4  * Copyright (C) 2009-2012 Siemens AG
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2
  8  * as published by the Free Software Foundation.
  9  *
 10  * This program is distributed in the hope that it will be useful,
 11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13  * GNU General Public License for more details.
 14  *
 15  * Written by:
 16  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
 17  * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
 18  * Alexander Aring <aar@pengutronix.de>
 19  */
 20 #include <linux/kernel.h>
 21 #include <linux/module.h>
 22 #include <linux/hrtimer.h>
 23 #include <linux/jiffies.h>
 24 #include <linux/interrupt.h>
 25 #include <linux/irq.h>
 26 #include <linux/gpio.h>
 27 #include <linux/delay.h>
 28 #include <linux/spi/spi.h>
 29 #include <linux/spi/at86rf230.h>
 30 #include <linux/regmap.h>
 31 #include <linux/skbuff.h>
 32 #include <linux/of_gpio.h>
 33 #include <linux/ieee802154.h>
 34 #include <linux/debugfs.h>
 35 
 36 #include <net/mac802154.h>
 37 #include <net/cfg802154.h>
 38 
 39 #include "at86rf230.h"
 40 
 41 struct at86rf230_local;
 42 /* at86rf2xx chip depend data.
 43  * All timings are in us.
 44  */
 45 struct at86rf2xx_chip_data {
 46         u16 t_sleep_cycle;
 47         u16 t_channel_switch;
 48         u16 t_reset_to_off;
 49         u16 t_off_to_aack;
 50         u16 t_off_to_tx_on;
 51         u16 t_off_to_sleep;
 52         u16 t_sleep_to_off;
 53         u16 t_frame;
 54         u16 t_p_ack;
 55         int rssi_base_val;
 56 
 57         int (*set_channel)(struct at86rf230_local *, u8, u8);
 58         int (*set_txpower)(struct at86rf230_local *, s32);
 59 };
 60 
 61 #define AT86RF2XX_MAX_BUF               (127 + 3)
 62 /* tx retries to access the TX_ON state
 63  * if it's above then force change will be started.
 64  *
 65  * We assume the max_frame_retries (7) value of 802.15.4 here.
 66  */
 67 #define AT86RF2XX_MAX_TX_RETRIES        7
 68 /* We use the recommended 5 minutes timeout to recalibrate */
 69 #define AT86RF2XX_CAL_LOOP_TIMEOUT      (5 * 60 * HZ)
 70 
 71 struct at86rf230_state_change {
 72         struct at86rf230_local *lp;
 73         int irq;
 74 
 75         struct hrtimer timer;
 76         struct spi_message msg;
 77         struct spi_transfer trx;
 78         u8 buf[AT86RF2XX_MAX_BUF];
 79 
 80         void (*complete)(void *context);
 81         u8 from_state;
 82         u8 to_state;
 83 
 84         bool free;
 85 };
 86 
 87 struct at86rf230_trac {
 88         u64 success;
 89         u64 success_data_pending;
 90         u64 success_wait_for_ack;
 91         u64 channel_access_failure;
 92         u64 no_ack;
 93         u64 invalid;
 94 };
 95 
 96 struct at86rf230_local {
 97         struct spi_device *spi;
 98 
 99         struct ieee802154_hw *hw;
100         struct at86rf2xx_chip_data *data;
101         struct regmap *regmap;
102         int slp_tr;
103         bool sleep;
104 
105         struct completion state_complete;
106         struct at86rf230_state_change state;
107 
108         unsigned long cal_timeout;
109         bool is_tx;
110         bool is_tx_from_off;
111         u8 tx_retry;
112         struct sk_buff *tx_skb;
113         struct at86rf230_state_change tx;
114 
115         struct at86rf230_trac trac;
116 };
117 
118 #define AT86RF2XX_NUMREGS 0x3F
119 
120 static void
121 at86rf230_async_state_change(struct at86rf230_local *lp,
122                              struct at86rf230_state_change *ctx,
123                              const u8 state, void (*complete)(void *context));
124 
125 static inline void
126 at86rf230_sleep(struct at86rf230_local *lp)
127 {
128         if (gpio_is_valid(lp->slp_tr)) {
129                 gpio_set_value(lp->slp_tr, 1);
130                 usleep_range(lp->data->t_off_to_sleep,
131                              lp->data->t_off_to_sleep + 10);
132                 lp->sleep = true;
133         }
134 }
135 
136 static inline void
137 at86rf230_awake(struct at86rf230_local *lp)
138 {
139         if (gpio_is_valid(lp->slp_tr)) {
140                 gpio_set_value(lp->slp_tr, 0);
141                 usleep_range(lp->data->t_sleep_to_off,
142                              lp->data->t_sleep_to_off + 100);
143                 lp->sleep = false;
144         }
145 }
146 
147 static inline int
148 __at86rf230_write(struct at86rf230_local *lp,
149                   unsigned int addr, unsigned int data)
150 {
151         bool sleep = lp->sleep;
152         int ret;
153 
154         /* awake for register setting if sleep */
155         if (sleep)
156                 at86rf230_awake(lp);
157 
158         ret = regmap_write(lp->regmap, addr, data);
159 
160         /* sleep again if was sleeping */
161         if (sleep)
162                 at86rf230_sleep(lp);
163 
164         return ret;
165 }
166 
167 static inline int
168 __at86rf230_read(struct at86rf230_local *lp,
169                  unsigned int addr, unsigned int *data)
170 {
171         bool sleep = lp->sleep;
172         int ret;
173 
174         /* awake for register setting if sleep */
175         if (sleep)
176                 at86rf230_awake(lp);
177 
178         ret = regmap_read(lp->regmap, addr, data);
179 
180         /* sleep again if was sleeping */
181         if (sleep)
182                 at86rf230_sleep(lp);
183 
184         return ret;
185 }
186 
187 static inline int
188 at86rf230_read_subreg(struct at86rf230_local *lp,
189                       unsigned int addr, unsigned int mask,
190                       unsigned int shift, unsigned int *data)
191 {
192         int rc;
193 
194         rc = __at86rf230_read(lp, addr, data);
195         if (!rc)
196                 *data = (*data & mask) >> shift;
197 
198         return rc;
199 }
200 
201 static inline int
202 at86rf230_write_subreg(struct at86rf230_local *lp,
203                        unsigned int addr, unsigned int mask,
204                        unsigned int shift, unsigned int data)
205 {
206         bool sleep = lp->sleep;
207         int ret;
208 
209         /* awake for register setting if sleep */
210         if (sleep)
211                 at86rf230_awake(lp);
212 
213         ret = regmap_update_bits(lp->regmap, addr, mask, data << shift);
214 
215         /* sleep again if was sleeping */
216         if (sleep)
217                 at86rf230_sleep(lp);
218 
219         return ret;
220 }
221 
222 static inline void
223 at86rf230_slp_tr_rising_edge(struct at86rf230_local *lp)
224 {
225         gpio_set_value(lp->slp_tr, 1);
226         udelay(1);
227         gpio_set_value(lp->slp_tr, 0);
228 }
229 
230 static bool
231 at86rf230_reg_writeable(struct device *dev, unsigned int reg)
232 {
233         switch (reg) {
234         case RG_TRX_STATE:
235         case RG_TRX_CTRL_0:
236         case RG_TRX_CTRL_1:
237         case RG_PHY_TX_PWR:
238         case RG_PHY_ED_LEVEL:
239         case RG_PHY_CC_CCA:
240         case RG_CCA_THRES:
241         case RG_RX_CTRL:
242         case RG_SFD_VALUE:
243         case RG_TRX_CTRL_2:
244         case RG_ANT_DIV:
245         case RG_IRQ_MASK:
246         case RG_VREG_CTRL:
247         case RG_BATMON:
248         case RG_XOSC_CTRL:
249         case RG_RX_SYN:
250         case RG_XAH_CTRL_1:
251         case RG_FTN_CTRL:
252         case RG_PLL_CF:
253         case RG_PLL_DCU:
254         case RG_SHORT_ADDR_0:
255         case RG_SHORT_ADDR_1:
256         case RG_PAN_ID_0:
257         case RG_PAN_ID_1:
258         case RG_IEEE_ADDR_0:
259         case RG_IEEE_ADDR_1:
260         case RG_IEEE_ADDR_2:
261         case RG_IEEE_ADDR_3:
262         case RG_IEEE_ADDR_4:
263         case RG_IEEE_ADDR_5:
264         case RG_IEEE_ADDR_6:
265         case RG_IEEE_ADDR_7:
266         case RG_XAH_CTRL_0:
267         case RG_CSMA_SEED_0:
268         case RG_CSMA_SEED_1:
269         case RG_CSMA_BE:
270                 return true;
271         default:
272                 return false;
273         }
274 }
275 
276 static bool
277 at86rf230_reg_readable(struct device *dev, unsigned int reg)
278 {
279         bool rc;
280 
281         /* all writeable are also readable */
282         rc = at86rf230_reg_writeable(dev, reg);
283         if (rc)
284                 return rc;
285 
286         /* readonly regs */
287         switch (reg) {
288         case RG_TRX_STATUS:
289         case RG_PHY_RSSI:
290         case RG_IRQ_STATUS:
291         case RG_PART_NUM:
292         case RG_VERSION_NUM:
293         case RG_MAN_ID_1:
294         case RG_MAN_ID_0:
295                 return true;
296         default:
297                 return false;
298         }
299 }
300 
301 static bool
302 at86rf230_reg_volatile(struct device *dev, unsigned int reg)
303 {
304         /* can be changed during runtime */
305         switch (reg) {
306         case RG_TRX_STATUS:
307         case RG_TRX_STATE:
308         case RG_PHY_RSSI:
309         case RG_PHY_ED_LEVEL:
310         case RG_IRQ_STATUS:
311         case RG_VREG_CTRL:
312         case RG_PLL_CF:
313         case RG_PLL_DCU:
314                 return true;
315         default:
316                 return false;
317         }
318 }
319 
320 static bool
321 at86rf230_reg_precious(struct device *dev, unsigned int reg)
322 {
323         /* don't clear irq line on read */
324         switch (reg) {
325         case RG_IRQ_STATUS:
326                 return true;
327         default:
328                 return false;
329         }
330 }
331 
332 static const struct regmap_config at86rf230_regmap_spi_config = {
333         .reg_bits = 8,
334         .val_bits = 8,
335         .write_flag_mask = CMD_REG | CMD_WRITE,
336         .read_flag_mask = CMD_REG,
337         .cache_type = REGCACHE_RBTREE,
338         .max_register = AT86RF2XX_NUMREGS,
339         .writeable_reg = at86rf230_reg_writeable,
340         .readable_reg = at86rf230_reg_readable,
341         .volatile_reg = at86rf230_reg_volatile,
342         .precious_reg = at86rf230_reg_precious,
343 };
344 
345 static void
346 at86rf230_async_error_recover_complete(void *context)
347 {
348         struct at86rf230_state_change *ctx = context;
349         struct at86rf230_local *lp = ctx->lp;
350 
351         if (ctx->free)
352                 kfree(ctx);
353 
354         ieee802154_wake_queue(lp->hw);
355 }
356 
357 static void
358 at86rf230_async_error_recover(void *context)
359 {
360         struct at86rf230_state_change *ctx = context;
361         struct at86rf230_local *lp = ctx->lp;
362 
363         lp->is_tx = 0;
364         at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON,
365                                      at86rf230_async_error_recover_complete);
366 }
367 
368 static inline void
369 at86rf230_async_error(struct at86rf230_local *lp,
370                       struct at86rf230_state_change *ctx, int rc)
371 {
372         dev_err(&lp->spi->dev, "spi_async error %d\n", rc);
373 
374         at86rf230_async_state_change(lp, ctx, STATE_FORCE_TRX_OFF,
375                                      at86rf230_async_error_recover);
376 }
377 
378 /* Generic function to get some register value in async mode */
379 static void
380 at86rf230_async_read_reg(struct at86rf230_local *lp, u8 reg,
381                          struct at86rf230_state_change *ctx,
382                          void (*complete)(void *context))
383 {
384         int rc;
385 
386         u8 *tx_buf = ctx->buf;
387 
388         tx_buf[0] = (reg & CMD_REG_MASK) | CMD_REG;
389         ctx->msg.complete = complete;
390         rc = spi_async(lp->spi, &ctx->msg);
391         if (rc)
392                 at86rf230_async_error(lp, ctx, rc);
393 }
394 
395 static void
396 at86rf230_async_write_reg(struct at86rf230_local *lp, u8 reg, u8 val,
397                           struct at86rf230_state_change *ctx,
398                           void (*complete)(void *context))
399 {
400         int rc;
401 
402         ctx->buf[0] = (reg & CMD_REG_MASK) | CMD_REG | CMD_WRITE;
403         ctx->buf[1] = val;
404         ctx->msg.complete = complete;
405         rc = spi_async(lp->spi, &ctx->msg);
406         if (rc)
407                 at86rf230_async_error(lp, ctx, rc);
408 }
409 
410 static void
411 at86rf230_async_state_assert(void *context)
412 {
413         struct at86rf230_state_change *ctx = context;
414         struct at86rf230_local *lp = ctx->lp;
415         const u8 *buf = ctx->buf;
416         const u8 trx_state = buf[1] & TRX_STATE_MASK;
417 
418         /* Assert state change */
419         if (trx_state != ctx->to_state) {
420                 /* Special handling if transceiver state is in
421                  * STATE_BUSY_RX_AACK and a SHR was detected.
422                  */
423                 if  (trx_state == STATE_BUSY_RX_AACK) {
424                         /* Undocumented race condition. If we send a state
425                          * change to STATE_RX_AACK_ON the transceiver could
426                          * change his state automatically to STATE_BUSY_RX_AACK
427                          * if a SHR was detected. This is not an error, but we
428                          * can't assert this.
429                          */
430                         if (ctx->to_state == STATE_RX_AACK_ON)
431                                 goto done;
432 
433                         /* If we change to STATE_TX_ON without forcing and
434                          * transceiver state is STATE_BUSY_RX_AACK, we wait
435                          * 'tFrame + tPAck' receiving time. In this time the
436                          * PDU should be received. If the transceiver is still
437                          * in STATE_BUSY_RX_AACK, we run a force state change
438                          * to STATE_TX_ON. This is a timeout handling, if the
439                          * transceiver stucks in STATE_BUSY_RX_AACK.
440                          *
441                          * Additional we do several retries to try to get into
442                          * TX_ON state without forcing. If the retries are
443                          * higher or equal than AT86RF2XX_MAX_TX_RETRIES we
444                          * will do a force change.
445                          */
446                         if (ctx->to_state == STATE_TX_ON ||
447                             ctx->to_state == STATE_TRX_OFF) {
448                                 u8 state = ctx->to_state;
449 
450                                 if (lp->tx_retry >= AT86RF2XX_MAX_TX_RETRIES)
451                                         state = STATE_FORCE_TRX_OFF;
452                                 lp->tx_retry++;
453 
454                                 at86rf230_async_state_change(lp, ctx, state,
455                                                              ctx->complete);
456                                 return;
457                         }
458                 }
459 
460                 dev_warn(&lp->spi->dev, "unexcept state change from 0x%02x to 0x%02x. Actual state: 0x%02x\n",
461                          ctx->from_state, ctx->to_state, trx_state);
462         }
463 
464 done:
465         if (ctx->complete)
466                 ctx->complete(context);
467 }
468 
469 static enum hrtimer_restart at86rf230_async_state_timer(struct hrtimer *timer)
470 {
471         struct at86rf230_state_change *ctx =
472                 container_of(timer, struct at86rf230_state_change, timer);
473         struct at86rf230_local *lp = ctx->lp;
474 
475         at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
476                                  at86rf230_async_state_assert);
477 
478         return HRTIMER_NORESTART;
479 }
480 
481 /* Do state change timing delay. */
482 static void
483 at86rf230_async_state_delay(void *context)
484 {
485         struct at86rf230_state_change *ctx = context;
486         struct at86rf230_local *lp = ctx->lp;
487         struct at86rf2xx_chip_data *c = lp->data;
488         bool force = false;
489         ktime_t tim;
490 
491         /* The force state changes are will show as normal states in the
492          * state status subregister. We change the to_state to the
493          * corresponding one and remember if it was a force change, this
494          * differs if we do a state change from STATE_BUSY_RX_AACK.
495          */
496         switch (ctx->to_state) {
497         case STATE_FORCE_TX_ON:
498                 ctx->to_state = STATE_TX_ON;
499                 force = true;
500                 break;
501         case STATE_FORCE_TRX_OFF:
502                 ctx->to_state = STATE_TRX_OFF;
503                 force = true;
504                 break;
505         default:
506                 break;
507         }
508 
509         switch (ctx->from_state) {
510         case STATE_TRX_OFF:
511                 switch (ctx->to_state) {
512                 case STATE_RX_AACK_ON:
513                         tim = c->t_off_to_aack * NSEC_PER_USEC;
514                         /* state change from TRX_OFF to RX_AACK_ON to do a
515                          * calibration, we need to reset the timeout for the
516                          * next one.
517                          */
518                         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
519                         goto change;
520                 case STATE_TX_ARET_ON:
521                 case STATE_TX_ON:
522                         tim = c->t_off_to_tx_on * NSEC_PER_USEC;
523                         /* state change from TRX_OFF to TX_ON or ARET_ON to do
524                          * a calibration, we need to reset the timeout for the
525                          * next one.
526                          */
527                         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
528                         goto change;
529                 default:
530                         break;
531                 }
532                 break;
533         case STATE_BUSY_RX_AACK:
534                 switch (ctx->to_state) {
535                 case STATE_TRX_OFF:
536                 case STATE_TX_ON:
537                         /* Wait for worst case receiving time if we
538                          * didn't make a force change from BUSY_RX_AACK
539                          * to TX_ON or TRX_OFF.
540                          */
541                         if (!force) {
542                                 tim = (c->t_frame + c->t_p_ack) * NSEC_PER_USEC;
543                                 goto change;
544                         }
545                         break;
546                 default:
547                         break;
548                 }
549                 break;
550         /* Default value, means RESET state */
551         case STATE_P_ON:
552                 switch (ctx->to_state) {
553                 case STATE_TRX_OFF:
554                         tim = c->t_reset_to_off * NSEC_PER_USEC;
555                         goto change;
556                 default:
557                         break;
558                 }
559                 break;
560         default:
561                 break;
562         }
563 
564         /* Default delay is 1us in the most cases */
565         udelay(1);
566         at86rf230_async_state_timer(&ctx->timer);
567         return;
568 
569 change:
570         hrtimer_start(&ctx->timer, tim, HRTIMER_MODE_REL);
571 }
572 
573 static void
574 at86rf230_async_state_change_start(void *context)
575 {
576         struct at86rf230_state_change *ctx = context;
577         struct at86rf230_local *lp = ctx->lp;
578         u8 *buf = ctx->buf;
579         const u8 trx_state = buf[1] & TRX_STATE_MASK;
580 
581         /* Check for "possible" STATE_TRANSITION_IN_PROGRESS */
582         if (trx_state == STATE_TRANSITION_IN_PROGRESS) {
583                 udelay(1);
584                 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
585                                          at86rf230_async_state_change_start);
586                 return;
587         }
588 
589         /* Check if we already are in the state which we change in */
590         if (trx_state == ctx->to_state) {
591                 if (ctx->complete)
592                         ctx->complete(context);
593                 return;
594         }
595 
596         /* Set current state to the context of state change */
597         ctx->from_state = trx_state;
598 
599         /* Going into the next step for a state change which do a timing
600          * relevant delay.
601          */
602         at86rf230_async_write_reg(lp, RG_TRX_STATE, ctx->to_state, ctx,
603                                   at86rf230_async_state_delay);
604 }
605 
606 static void
607 at86rf230_async_state_change(struct at86rf230_local *lp,
608                              struct at86rf230_state_change *ctx,
609                              const u8 state, void (*complete)(void *context))
610 {
611         /* Initialization for the state change context */
612         ctx->to_state = state;
613         ctx->complete = complete;
614         at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
615                                  at86rf230_async_state_change_start);
616 }
617 
618 static void
619 at86rf230_sync_state_change_complete(void *context)
620 {
621         struct at86rf230_state_change *ctx = context;
622         struct at86rf230_local *lp = ctx->lp;
623 
624         complete(&lp->state_complete);
625 }
626 
627 /* This function do a sync framework above the async state change.
628  * Some callbacks of the IEEE 802.15.4 driver interface need to be
629  * handled synchronously.
630  */
631 static int
632 at86rf230_sync_state_change(struct at86rf230_local *lp, unsigned int state)
633 {
634         unsigned long rc;
635 
636         at86rf230_async_state_change(lp, &lp->state, state,
637                                      at86rf230_sync_state_change_complete);
638 
639         rc = wait_for_completion_timeout(&lp->state_complete,
640                                          msecs_to_jiffies(100));
641         if (!rc) {
642                 at86rf230_async_error(lp, &lp->state, -ETIMEDOUT);
643                 return -ETIMEDOUT;
644         }
645 
646         return 0;
647 }
648 
649 static void
650 at86rf230_tx_complete(void *context)
651 {
652         struct at86rf230_state_change *ctx = context;
653         struct at86rf230_local *lp = ctx->lp;
654 
655         ieee802154_xmit_complete(lp->hw, lp->tx_skb, false);
656         kfree(ctx);
657 }
658 
659 static void
660 at86rf230_tx_on(void *context)
661 {
662         struct at86rf230_state_change *ctx = context;
663         struct at86rf230_local *lp = ctx->lp;
664 
665         at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON,
666                                      at86rf230_tx_complete);
667 }
668 
669 static void
670 at86rf230_tx_trac_check(void *context)
671 {
672         struct at86rf230_state_change *ctx = context;
673         struct at86rf230_local *lp = ctx->lp;
674 
675         if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS)) {
676                 u8 trac = TRAC_MASK(ctx->buf[1]);
677 
678                 switch (trac) {
679                 case TRAC_SUCCESS:
680                         lp->trac.success++;
681                         break;
682                 case TRAC_SUCCESS_DATA_PENDING:
683                         lp->trac.success_data_pending++;
684                         break;
685                 case TRAC_CHANNEL_ACCESS_FAILURE:
686                         lp->trac.channel_access_failure++;
687                         break;
688                 case TRAC_NO_ACK:
689                         lp->trac.no_ack++;
690                         break;
691                 case TRAC_INVALID:
692                         lp->trac.invalid++;
693                         break;
694                 default:
695                         WARN_ONCE(1, "received tx trac status %d\n", trac);
696                         break;
697                 }
698         }
699 
700         at86rf230_async_state_change(lp, ctx, STATE_TX_ON, at86rf230_tx_on);
701 }
702 
703 static void
704 at86rf230_rx_read_frame_complete(void *context)
705 {
706         struct at86rf230_state_change *ctx = context;
707         struct at86rf230_local *lp = ctx->lp;
708         const u8 *buf = ctx->buf;
709         struct sk_buff *skb;
710         u8 len, lqi;
711 
712         len = buf[1];
713         if (!ieee802154_is_valid_psdu_len(len)) {
714                 dev_vdbg(&lp->spi->dev, "corrupted frame received\n");
715                 len = IEEE802154_MTU;
716         }
717         lqi = buf[2 + len];
718 
719         skb = dev_alloc_skb(IEEE802154_MTU);
720         if (!skb) {
721                 dev_vdbg(&lp->spi->dev, "failed to allocate sk_buff\n");
722                 kfree(ctx);
723                 return;
724         }
725 
726         memcpy(skb_put(skb, len), buf + 2, len);
727         ieee802154_rx_irqsafe(lp->hw, skb, lqi);
728         kfree(ctx);
729 }
730 
731 static void
732 at86rf230_rx_trac_check(void *context)
733 {
734         struct at86rf230_state_change *ctx = context;
735         struct at86rf230_local *lp = ctx->lp;
736         u8 *buf = ctx->buf;
737         int rc;
738 
739         if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS)) {
740                 u8 trac = TRAC_MASK(buf[1]);
741 
742                 switch (trac) {
743                 case TRAC_SUCCESS:
744                         lp->trac.success++;
745                         break;
746                 case TRAC_SUCCESS_WAIT_FOR_ACK:
747                         lp->trac.success_wait_for_ack++;
748                         break;
749                 case TRAC_INVALID:
750                         lp->trac.invalid++;
751                         break;
752                 default:
753                         WARN_ONCE(1, "received rx trac status %d\n", trac);
754                         break;
755                 }
756         }
757 
758         buf[0] = CMD_FB;
759         ctx->trx.len = AT86RF2XX_MAX_BUF;
760         ctx->msg.complete = at86rf230_rx_read_frame_complete;
761         rc = spi_async(lp->spi, &ctx->msg);
762         if (rc) {
763                 ctx->trx.len = 2;
764                 at86rf230_async_error(lp, ctx, rc);
765         }
766 }
767 
768 static void
769 at86rf230_irq_trx_end(void *context)
770 {
771         struct at86rf230_state_change *ctx = context;
772         struct at86rf230_local *lp = ctx->lp;
773 
774         if (lp->is_tx) {
775                 lp->is_tx = 0;
776                 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx,
777                                          at86rf230_tx_trac_check);
778         } else {
779                 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx,
780                                          at86rf230_rx_trac_check);
781         }
782 }
783 
784 static void
785 at86rf230_irq_status(void *context)
786 {
787         struct at86rf230_state_change *ctx = context;
788         struct at86rf230_local *lp = ctx->lp;
789         const u8 *buf = ctx->buf;
790         u8 irq = buf[1];
791 
792         enable_irq(lp->spi->irq);
793 
794         if (irq & IRQ_TRX_END) {
795                 at86rf230_irq_trx_end(ctx);
796         } else {
797                 dev_err(&lp->spi->dev, "not supported irq %02x received\n",
798                         irq);
799                 kfree(ctx);
800         }
801 }
802 
803 static void
804 at86rf230_setup_spi_messages(struct at86rf230_local *lp,
805                              struct at86rf230_state_change *state)
806 {
807         state->lp = lp;
808         state->irq = lp->spi->irq;
809         spi_message_init(&state->msg);
810         state->msg.context = state;
811         state->trx.len = 2;
812         state->trx.tx_buf = state->buf;
813         state->trx.rx_buf = state->buf;
814         spi_message_add_tail(&state->trx, &state->msg);
815         hrtimer_init(&state->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
816         state->timer.function = at86rf230_async_state_timer;
817 }
818 
819 static irqreturn_t at86rf230_isr(int irq, void *data)
820 {
821         struct at86rf230_local *lp = data;
822         struct at86rf230_state_change *ctx;
823         int rc;
824 
825         disable_irq_nosync(irq);
826 
827         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
828         if (!ctx) {
829                 enable_irq(irq);
830                 return IRQ_NONE;
831         }
832 
833         at86rf230_setup_spi_messages(lp, ctx);
834         /* tell on error handling to free ctx */
835         ctx->free = true;
836 
837         ctx->buf[0] = (RG_IRQ_STATUS & CMD_REG_MASK) | CMD_REG;
838         ctx->msg.complete = at86rf230_irq_status;
839         rc = spi_async(lp->spi, &ctx->msg);
840         if (rc) {
841                 at86rf230_async_error(lp, ctx, rc);
842                 enable_irq(irq);
843                 return IRQ_NONE;
844         }
845 
846         return IRQ_HANDLED;
847 }
848 
849 static void
850 at86rf230_write_frame_complete(void *context)
851 {
852         struct at86rf230_state_change *ctx = context;
853         struct at86rf230_local *lp = ctx->lp;
854 
855         ctx->trx.len = 2;
856 
857         if (gpio_is_valid(lp->slp_tr))
858                 at86rf230_slp_tr_rising_edge(lp);
859         else
860                 at86rf230_async_write_reg(lp, RG_TRX_STATE, STATE_BUSY_TX, ctx,
861                                           NULL);
862 }
863 
864 static void
865 at86rf230_write_frame(void *context)
866 {
867         struct at86rf230_state_change *ctx = context;
868         struct at86rf230_local *lp = ctx->lp;
869         struct sk_buff *skb = lp->tx_skb;
870         u8 *buf = ctx->buf;
871         int rc;
872 
873         lp->is_tx = 1;
874 
875         buf[0] = CMD_FB | CMD_WRITE;
876         buf[1] = skb->len + 2;
877         memcpy(buf + 2, skb->data, skb->len);
878         ctx->trx.len = skb->len + 2;
879         ctx->msg.complete = at86rf230_write_frame_complete;
880         rc = spi_async(lp->spi, &ctx->msg);
881         if (rc) {
882                 ctx->trx.len = 2;
883                 at86rf230_async_error(lp, ctx, rc);
884         }
885 }
886 
887 static void
888 at86rf230_xmit_tx_on(void *context)
889 {
890         struct at86rf230_state_change *ctx = context;
891         struct at86rf230_local *lp = ctx->lp;
892 
893         at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
894                                      at86rf230_write_frame);
895 }
896 
897 static void
898 at86rf230_xmit_start(void *context)
899 {
900         struct at86rf230_state_change *ctx = context;
901         struct at86rf230_local *lp = ctx->lp;
902 
903         /* check if we change from off state */
904         if (lp->is_tx_from_off)
905                 at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
906                                              at86rf230_write_frame);
907         else
908                 at86rf230_async_state_change(lp, ctx, STATE_TX_ON,
909                                              at86rf230_xmit_tx_on);
910 }
911 
912 static int
913 at86rf230_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
914 {
915         struct at86rf230_local *lp = hw->priv;
916         struct at86rf230_state_change *ctx = &lp->tx;
917 
918         lp->tx_skb = skb;
919         lp->tx_retry = 0;
920 
921         /* After 5 minutes in PLL and the same frequency we run again the
922          * calibration loops which is recommended by at86rf2xx datasheets.
923          *
924          * The calibration is initiate by a state change from TRX_OFF
925          * to TX_ON, the lp->cal_timeout should be reinit by state_delay
926          * function then to start in the next 5 minutes.
927          */
928         if (time_is_before_jiffies(lp->cal_timeout)) {
929                 lp->is_tx_from_off = true;
930                 at86rf230_async_state_change(lp, ctx, STATE_TRX_OFF,
931                                              at86rf230_xmit_start);
932         } else {
933                 lp->is_tx_from_off = false;
934                 at86rf230_xmit_start(ctx);
935         }
936 
937         return 0;
938 }
939 
940 static int
941 at86rf230_ed(struct ieee802154_hw *hw, u8 *level)
942 {
943         BUG_ON(!level);
944         *level = 0xbe;
945         return 0;
946 }
947 
948 static int
949 at86rf230_start(struct ieee802154_hw *hw)
950 {
951         struct at86rf230_local *lp = hw->priv;
952 
953         /* reset trac stats on start */
954         if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS))
955                 memset(&lp->trac, 0, sizeof(struct at86rf230_trac));
956 
957         at86rf230_awake(lp);
958         enable_irq(lp->spi->irq);
959 
960         return at86rf230_sync_state_change(lp, STATE_RX_AACK_ON);
961 }
962 
963 static void
964 at86rf230_stop(struct ieee802154_hw *hw)
965 {
966         struct at86rf230_local *lp = hw->priv;
967         u8 csma_seed[2];
968 
969         at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
970 
971         disable_irq(lp->spi->irq);
972 
973         /* It's recommended to set random new csma_seeds before sleep state.
974          * Makes only sense in the stop callback, not doing this inside of
975          * at86rf230_sleep, this is also used when we don't transmit afterwards
976          * when calling start callback again.
977          */
978         get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
979         at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
980         at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
981 
982         at86rf230_sleep(lp);
983 }
984 
985 static int
986 at86rf23x_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
987 {
988         return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
989 }
990 
991 #define AT86RF2XX_MAX_ED_LEVELS 0xF
992 static const s32 at86rf233_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = {
993         -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000, -7800, -7600,
994         -7400, -7200, -7000, -6800, -6600, -6400,
995 };
996 
997 static const s32 at86rf231_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = {
998         -9100, -8900, -8700, -8500, -8300, -8100, -7900, -7700, -7500, -7300,
999         -7100, -6900, -6700, -6500, -6300, -6100,
1000 };
1001 
1002 static const s32 at86rf212_ed_levels_100[AT86RF2XX_MAX_ED_LEVELS + 1] = {
1003         -10000, -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200,
1004         -8000, -7800, -7600, -7400, -7200, -7000,
1005 };
1006 
1007 static const s32 at86rf212_ed_levels_98[AT86RF2XX_MAX_ED_LEVELS + 1] = {
1008         -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000,
1009         -7800, -7600, -7400, -7200, -7000, -6800,
1010 };
1011 
1012 static inline int
1013 at86rf212_update_cca_ed_level(struct at86rf230_local *lp, int rssi_base_val)
1014 {
1015         unsigned int cca_ed_thres;
1016         int rc;
1017 
1018         rc = at86rf230_read_subreg(lp, SR_CCA_ED_THRES, &cca_ed_thres);
1019         if (rc < 0)
1020                 return rc;
1021 
1022         switch (rssi_base_val) {
1023         case -98:
1024                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_98;
1025                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_98);
1026                 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_98[cca_ed_thres];
1027                 break;
1028         case -100:
1029                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
1030                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
1031                 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_100[cca_ed_thres];
1032                 break;
1033         default:
1034                 WARN_ON(1);
1035         }
1036 
1037         return 0;
1038 }
1039 
1040 static int
1041 at86rf212_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
1042 {
1043         int rc;
1044 
1045         if (channel == 0)
1046                 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 0);
1047         else
1048                 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 1);
1049         if (rc < 0)
1050                 return rc;
1051 
1052         if (page == 0) {
1053                 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 0);
1054                 lp->data->rssi_base_val = -100;
1055         } else {
1056                 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 1);
1057                 lp->data->rssi_base_val = -98;
1058         }
1059         if (rc < 0)
1060                 return rc;
1061 
1062         rc = at86rf212_update_cca_ed_level(lp, lp->data->rssi_base_val);
1063         if (rc < 0)
1064                 return rc;
1065 
1066         /* This sets the symbol_duration according frequency on the 212.
1067          * TODO move this handling while set channel and page in cfg802154.
1068          * We can do that, this timings are according 802.15.4 standard.
1069          * If we do that in cfg802154, this is a more generic calculation.
1070          *
1071          * This should also protected from ifs_timer. Means cancel timer and
1072          * init with a new value. For now, this is okay.
1073          */
1074         if (channel == 0) {
1075                 if (page == 0) {
1076                         /* SUB:0 and BPSK:0 -> BPSK-20 */
1077                         lp->hw->phy->symbol_duration = 50;
1078                 } else {
1079                         /* SUB:1 and BPSK:0 -> BPSK-40 */
1080                         lp->hw->phy->symbol_duration = 25;
1081                 }
1082         } else {
1083                 if (page == 0)
1084                         /* SUB:0 and BPSK:1 -> OQPSK-100/200/400 */
1085                         lp->hw->phy->symbol_duration = 40;
1086                 else
1087                         /* SUB:1 and BPSK:1 -> OQPSK-250/500/1000 */
1088                         lp->hw->phy->symbol_duration = 16;
1089         }
1090 
1091         lp->hw->phy->lifs_period = IEEE802154_LIFS_PERIOD *
1092                                    lp->hw->phy->symbol_duration;
1093         lp->hw->phy->sifs_period = IEEE802154_SIFS_PERIOD *
1094                                    lp->hw->phy->symbol_duration;
1095 
1096         return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
1097 }
1098 
1099 static int
1100 at86rf230_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
1101 {
1102         struct at86rf230_local *lp = hw->priv;
1103         int rc;
1104 
1105         rc = lp->data->set_channel(lp, page, channel);
1106         /* Wait for PLL */
1107         usleep_range(lp->data->t_channel_switch,
1108                      lp->data->t_channel_switch + 10);
1109 
1110         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
1111         return rc;
1112 }
1113 
1114 static int
1115 at86rf230_set_hw_addr_filt(struct ieee802154_hw *hw,
1116                            struct ieee802154_hw_addr_filt *filt,
1117                            unsigned long changed)
1118 {
1119         struct at86rf230_local *lp = hw->priv;
1120 
1121         if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
1122                 u16 addr = le16_to_cpu(filt->short_addr);
1123 
1124                 dev_vdbg(&lp->spi->dev,
1125                          "at86rf230_set_hw_addr_filt called for saddr\n");
1126                 __at86rf230_write(lp, RG_SHORT_ADDR_0, addr);
1127                 __at86rf230_write(lp, RG_SHORT_ADDR_1, addr >> 8);
1128         }
1129 
1130         if (changed & IEEE802154_AFILT_PANID_CHANGED) {
1131                 u16 pan = le16_to_cpu(filt->pan_id);
1132 
1133                 dev_vdbg(&lp->spi->dev,
1134                          "at86rf230_set_hw_addr_filt called for pan id\n");
1135                 __at86rf230_write(lp, RG_PAN_ID_0, pan);
1136                 __at86rf230_write(lp, RG_PAN_ID_1, pan >> 8);
1137         }
1138 
1139         if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
1140                 u8 i, addr[8];
1141 
1142                 memcpy(addr, &filt->ieee_addr, 8);
1143                 dev_vdbg(&lp->spi->dev,
1144                          "at86rf230_set_hw_addr_filt called for IEEE addr\n");
1145                 for (i = 0; i < 8; i++)
1146                         __at86rf230_write(lp, RG_IEEE_ADDR_0 + i, addr[i]);
1147         }
1148 
1149         if (changed & IEEE802154_AFILT_PANC_CHANGED) {
1150                 dev_vdbg(&lp->spi->dev,
1151                          "at86rf230_set_hw_addr_filt called for panc change\n");
1152                 if (filt->pan_coord)
1153                         at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 1);
1154                 else
1155                         at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 0);
1156         }
1157 
1158         return 0;
1159 }
1160 
1161 #define AT86RF23X_MAX_TX_POWERS 0xF
1162 static const s32 at86rf233_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1163         400, 370, 340, 300, 250, 200, 100, 0, -100, -200, -300, -400, -600,
1164         -800, -1200, -1700,
1165 };
1166 
1167 static const s32 at86rf231_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1168         300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700,
1169         -900, -1200, -1700,
1170 };
1171 
1172 #define AT86RF212_MAX_TX_POWERS 0x1F
1173 static const s32 at86rf212_powers[AT86RF212_MAX_TX_POWERS + 1] = {
1174         500, 400, 300, 200, 100, 0, -100, -200, -300, -400, -500, -600, -700,
1175         -800, -900, -1000, -1100, -1200, -1300, -1400, -1500, -1600, -1700,
1176         -1800, -1900, -2000, -2100, -2200, -2300, -2400, -2500, -2600,
1177 };
1178 
1179 static int
1180 at86rf23x_set_txpower(struct at86rf230_local *lp, s32 mbm)
1181 {
1182         u32 i;
1183 
1184         for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1185                 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1186                         return at86rf230_write_subreg(lp, SR_TX_PWR_23X, i);
1187         }
1188 
1189         return -EINVAL;
1190 }
1191 
1192 static int
1193 at86rf212_set_txpower(struct at86rf230_local *lp, s32 mbm)
1194 {
1195         u32 i;
1196 
1197         for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1198                 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1199                         return at86rf230_write_subreg(lp, SR_TX_PWR_212, i);
1200         }
1201 
1202         return -EINVAL;
1203 }
1204 
1205 static int
1206 at86rf230_set_txpower(struct ieee802154_hw *hw, s32 mbm)
1207 {
1208         struct at86rf230_local *lp = hw->priv;
1209 
1210         return lp->data->set_txpower(lp, mbm);
1211 }
1212 
1213 static int
1214 at86rf230_set_lbt(struct ieee802154_hw *hw, bool on)
1215 {
1216         struct at86rf230_local *lp = hw->priv;
1217 
1218         return at86rf230_write_subreg(lp, SR_CSMA_LBT_MODE, on);
1219 }
1220 
1221 static int
1222 at86rf230_set_cca_mode(struct ieee802154_hw *hw,
1223                        const struct wpan_phy_cca *cca)
1224 {
1225         struct at86rf230_local *lp = hw->priv;
1226         u8 val;
1227 
1228         /* mapping 802.15.4 to driver spec */
1229         switch (cca->mode) {
1230         case NL802154_CCA_ENERGY:
1231                 val = 1;
1232                 break;
1233         case NL802154_CCA_CARRIER:
1234                 val = 2;
1235                 break;
1236         case NL802154_CCA_ENERGY_CARRIER:
1237                 switch (cca->opt) {
1238                 case NL802154_CCA_OPT_ENERGY_CARRIER_AND:
1239                         val = 3;
1240                         break;
1241                 case NL802154_CCA_OPT_ENERGY_CARRIER_OR:
1242                         val = 0;
1243                         break;
1244                 default:
1245                         return -EINVAL;
1246                 }
1247                 break;
1248         default:
1249                 return -EINVAL;
1250         }
1251 
1252         return at86rf230_write_subreg(lp, SR_CCA_MODE, val);
1253 }
1254 
1255 
1256 static int
1257 at86rf230_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
1258 {
1259         struct at86rf230_local *lp = hw->priv;
1260         u32 i;
1261 
1262         for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) {
1263                 if (hw->phy->supported.cca_ed_levels[i] == mbm)
1264                         return at86rf230_write_subreg(lp, SR_CCA_ED_THRES, i);
1265         }
1266 
1267         return -EINVAL;
1268 }
1269 
1270 static int
1271 at86rf230_set_csma_params(struct ieee802154_hw *hw, u8 min_be, u8 max_be,
1272                           u8 retries)
1273 {
1274         struct at86rf230_local *lp = hw->priv;
1275         int rc;
1276 
1277         rc = at86rf230_write_subreg(lp, SR_MIN_BE, min_be);
1278         if (rc)
1279                 return rc;
1280 
1281         rc = at86rf230_write_subreg(lp, SR_MAX_BE, max_be);
1282         if (rc)
1283                 return rc;
1284 
1285         return at86rf230_write_subreg(lp, SR_MAX_CSMA_RETRIES, retries);
1286 }
1287 
1288 static int
1289 at86rf230_set_frame_retries(struct ieee802154_hw *hw, s8 retries)
1290 {
1291         struct at86rf230_local *lp = hw->priv;
1292 
1293         return at86rf230_write_subreg(lp, SR_MAX_FRAME_RETRIES, retries);
1294 }
1295 
1296 static int
1297 at86rf230_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
1298 {
1299         struct at86rf230_local *lp = hw->priv;
1300         int rc;
1301 
1302         if (on) {
1303                 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 1);
1304                 if (rc < 0)
1305                         return rc;
1306 
1307                 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 1);
1308                 if (rc < 0)
1309                         return rc;
1310         } else {
1311                 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 0);
1312                 if (rc < 0)
1313                         return rc;
1314 
1315                 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 0);
1316                 if (rc < 0)
1317                         return rc;
1318         }
1319 
1320         return 0;
1321 }
1322 
1323 static const struct ieee802154_ops at86rf230_ops = {
1324         .owner = THIS_MODULE,
1325         .xmit_async = at86rf230_xmit,
1326         .ed = at86rf230_ed,
1327         .set_channel = at86rf230_channel,
1328         .start = at86rf230_start,
1329         .stop = at86rf230_stop,
1330         .set_hw_addr_filt = at86rf230_set_hw_addr_filt,
1331         .set_txpower = at86rf230_set_txpower,
1332         .set_lbt = at86rf230_set_lbt,
1333         .set_cca_mode = at86rf230_set_cca_mode,
1334         .set_cca_ed_level = at86rf230_set_cca_ed_level,
1335         .set_csma_params = at86rf230_set_csma_params,
1336         .set_frame_retries = at86rf230_set_frame_retries,
1337         .set_promiscuous_mode = at86rf230_set_promiscuous_mode,
1338 };
1339 
1340 static struct at86rf2xx_chip_data at86rf233_data = {
1341         .t_sleep_cycle = 330,
1342         .t_channel_switch = 11,
1343         .t_reset_to_off = 26,
1344         .t_off_to_aack = 80,
1345         .t_off_to_tx_on = 80,
1346         .t_off_to_sleep = 35,
1347         .t_sleep_to_off = 1000,
1348         .t_frame = 4096,
1349         .t_p_ack = 545,
1350         .rssi_base_val = -94,
1351         .set_channel = at86rf23x_set_channel,
1352         .set_txpower = at86rf23x_set_txpower,
1353 };
1354 
1355 static struct at86rf2xx_chip_data at86rf231_data = {
1356         .t_sleep_cycle = 330,
1357         .t_channel_switch = 24,
1358         .t_reset_to_off = 37,
1359         .t_off_to_aack = 110,
1360         .t_off_to_tx_on = 110,
1361         .t_off_to_sleep = 35,
1362         .t_sleep_to_off = 1000,
1363         .t_frame = 4096,
1364         .t_p_ack = 545,
1365         .rssi_base_val = -91,
1366         .set_channel = at86rf23x_set_channel,
1367         .set_txpower = at86rf23x_set_txpower,
1368 };
1369 
1370 static struct at86rf2xx_chip_data at86rf212_data = {
1371         .t_sleep_cycle = 330,
1372         .t_channel_switch = 11,
1373         .t_reset_to_off = 26,
1374         .t_off_to_aack = 200,
1375         .t_off_to_tx_on = 200,
1376         .t_off_to_sleep = 35,
1377         .t_sleep_to_off = 1000,
1378         .t_frame = 4096,
1379         .t_p_ack = 545,
1380         .rssi_base_val = -100,
1381         .set_channel = at86rf212_set_channel,
1382         .set_txpower = at86rf212_set_txpower,
1383 };
1384 
1385 static int at86rf230_hw_init(struct at86rf230_local *lp, u8 xtal_trim)
1386 {
1387         int rc, irq_type, irq_pol = IRQ_ACTIVE_HIGH;
1388         unsigned int dvdd;
1389         u8 csma_seed[2];
1390 
1391         rc = at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
1392         if (rc)
1393                 return rc;
1394 
1395         irq_type = irq_get_trigger_type(lp->spi->irq);
1396         if (irq_type == IRQ_TYPE_EDGE_FALLING ||
1397             irq_type == IRQ_TYPE_LEVEL_LOW)
1398                 irq_pol = IRQ_ACTIVE_LOW;
1399 
1400         rc = at86rf230_write_subreg(lp, SR_IRQ_POLARITY, irq_pol);
1401         if (rc)
1402                 return rc;
1403 
1404         rc = at86rf230_write_subreg(lp, SR_RX_SAFE_MODE, 1);
1405         if (rc)
1406                 return rc;
1407 
1408         rc = at86rf230_write_subreg(lp, SR_IRQ_MASK, IRQ_TRX_END);
1409         if (rc)
1410                 return rc;
1411 
1412         /* reset values differs in at86rf231 and at86rf233 */
1413         rc = at86rf230_write_subreg(lp, SR_IRQ_MASK_MODE, 0);
1414         if (rc)
1415                 return rc;
1416 
1417         get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
1418         rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
1419         if (rc)
1420                 return rc;
1421         rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
1422         if (rc)
1423                 return rc;
1424 
1425         /* CLKM changes are applied immediately */
1426         rc = at86rf230_write_subreg(lp, SR_CLKM_SHA_SEL, 0x00);
1427         if (rc)
1428                 return rc;
1429 
1430         /* Turn CLKM Off */
1431         rc = at86rf230_write_subreg(lp, SR_CLKM_CTRL, 0x00);
1432         if (rc)
1433                 return rc;
1434         /* Wait the next SLEEP cycle */
1435         usleep_range(lp->data->t_sleep_cycle,
1436                      lp->data->t_sleep_cycle + 100);
1437 
1438         /* xtal_trim value is calculated by:
1439          * CL = 0.5 * (CX + CTRIM + CPAR)
1440          *
1441          * whereas:
1442          * CL = capacitor of used crystal
1443          * CX = connected capacitors at xtal pins
1444          * CPAR = in all at86rf2xx datasheets this is a constant value 3 pF,
1445          *        but this is different on each board setup. You need to fine
1446          *        tuning this value via CTRIM.
1447          * CTRIM = variable capacitor setting. Resolution is 0.3 pF range is
1448          *         0 pF upto 4.5 pF.
1449          *
1450          * Examples:
1451          * atben transceiver:
1452          *
1453          * CL = 8 pF
1454          * CX = 12 pF
1455          * CPAR = 3 pF (We assume the magic constant from datasheet)
1456          * CTRIM = 0.9 pF
1457          *
1458          * (12+0.9+3)/2 = 7.95 which is nearly at 8 pF
1459          *
1460          * xtal_trim = 0x3
1461          *
1462          * openlabs transceiver:
1463          *
1464          * CL = 16 pF
1465          * CX = 22 pF
1466          * CPAR = 3 pF (We assume the magic constant from datasheet)
1467          * CTRIM = 4.5 pF
1468          *
1469          * (22+4.5+3)/2 = 14.75 which is the nearest value to 16 pF
1470          *
1471          * xtal_trim = 0xf
1472          */
1473         rc = at86rf230_write_subreg(lp, SR_XTAL_TRIM, xtal_trim);
1474         if (rc)
1475                 return rc;
1476 
1477         rc = at86rf230_read_subreg(lp, SR_DVDD_OK, &dvdd);
1478         if (rc)
1479                 return rc;
1480         if (!dvdd) {
1481                 dev_err(&lp->spi->dev, "DVDD error\n");
1482                 return -EINVAL;
1483         }
1484 
1485         /* Force setting slotted operation bit to 0. Sometimes the atben
1486          * sets this bit and I don't know why. We set this always force
1487          * to zero while probing.
1488          */
1489         return at86rf230_write_subreg(lp, SR_SLOTTED_OPERATION, 0);
1490 }
1491 
1492 static int
1493 at86rf230_get_pdata(struct spi_device *spi, int *rstn, int *slp_tr,
1494                     u8 *xtal_trim)
1495 {
1496         struct at86rf230_platform_data *pdata = spi->dev.platform_data;
1497         int ret;
1498 
1499         if (!IS_ENABLED(CONFIG_OF) || !spi->dev.of_node) {
1500                 if (!pdata)
1501                         return -ENOENT;
1502 
1503                 *rstn = pdata->rstn;
1504                 *slp_tr = pdata->slp_tr;
1505                 *xtal_trim = pdata->xtal_trim;
1506                 return 0;
1507         }
1508 
1509         *rstn = of_get_named_gpio(spi->dev.of_node, "reset-gpio", 0);
1510         *slp_tr = of_get_named_gpio(spi->dev.of_node, "sleep-gpio", 0);
1511         ret = of_property_read_u8(spi->dev.of_node, "xtal-trim", xtal_trim);
1512         if (ret < 0 && ret != -EINVAL)
1513                 return ret;
1514 
1515         return 0;
1516 }
1517 
1518 static int
1519 at86rf230_detect_device(struct at86rf230_local *lp)
1520 {
1521         unsigned int part, version, val;
1522         u16 man_id = 0;
1523         const char *chip;
1524         int rc;
1525 
1526         rc = __at86rf230_read(lp, RG_MAN_ID_0, &val);
1527         if (rc)
1528                 return rc;
1529         man_id |= val;
1530 
1531         rc = __at86rf230_read(lp, RG_MAN_ID_1, &val);
1532         if (rc)
1533                 return rc;
1534         man_id |= (val << 8);
1535 
1536         rc = __at86rf230_read(lp, RG_PART_NUM, &part);
1537         if (rc)
1538                 return rc;
1539 
1540         rc = __at86rf230_read(lp, RG_VERSION_NUM, &version);
1541         if (rc)
1542                 return rc;
1543 
1544         if (man_id != 0x001f) {
1545                 dev_err(&lp->spi->dev, "Non-Atmel dev found (MAN_ID %02x %02x)\n",
1546                         man_id >> 8, man_id & 0xFF);
1547                 return -EINVAL;
1548         }
1549 
1550         lp->hw->flags = IEEE802154_HW_TX_OMIT_CKSUM |
1551                         IEEE802154_HW_CSMA_PARAMS |
1552                         IEEE802154_HW_FRAME_RETRIES | IEEE802154_HW_AFILT |
1553                         IEEE802154_HW_PROMISCUOUS;
1554 
1555         lp->hw->phy->flags = WPAN_PHY_FLAG_TXPOWER |
1556                              WPAN_PHY_FLAG_CCA_ED_LEVEL |
1557                              WPAN_PHY_FLAG_CCA_MODE;
1558 
1559         lp->hw->phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY) |
1560                 BIT(NL802154_CCA_CARRIER) | BIT(NL802154_CCA_ENERGY_CARRIER);
1561         lp->hw->phy->supported.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND) |
1562                 BIT(NL802154_CCA_OPT_ENERGY_CARRIER_OR);
1563 
1564         lp->hw->phy->cca.mode = NL802154_CCA_ENERGY;
1565 
1566         switch (part) {
1567         case 2:
1568                 chip = "at86rf230";
1569                 rc = -ENOTSUPP;
1570                 goto not_supp;
1571         case 3:
1572                 chip = "at86rf231";
1573                 lp->data = &at86rf231_data;
1574                 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1575                 lp->hw->phy->current_channel = 11;
1576                 lp->hw->phy->symbol_duration = 16;
1577                 lp->hw->phy->supported.tx_powers = at86rf231_powers;
1578                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf231_powers);
1579                 lp->hw->phy->supported.cca_ed_levels = at86rf231_ed_levels;
1580                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf231_ed_levels);
1581                 break;
1582         case 7:
1583                 chip = "at86rf212";
1584                 lp->data = &at86rf212_data;
1585                 lp->hw->flags |= IEEE802154_HW_LBT;
1586                 lp->hw->phy->supported.channels[0] = 0x00007FF;
1587                 lp->hw->phy->supported.channels[2] = 0x00007FF;
1588                 lp->hw->phy->current_channel = 5;
1589                 lp->hw->phy->symbol_duration = 25;
1590                 lp->hw->phy->supported.lbt = NL802154_SUPPORTED_BOOL_BOTH;
1591                 lp->hw->phy->supported.tx_powers = at86rf212_powers;
1592                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf212_powers);
1593                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
1594                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
1595                 break;
1596         case 11:
1597                 chip = "at86rf233";
1598                 lp->data = &at86rf233_data;
1599                 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1600                 lp->hw->phy->current_channel = 13;
1601                 lp->hw->phy->symbol_duration = 16;
1602                 lp->hw->phy->supported.tx_powers = at86rf233_powers;
1603                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf233_powers);
1604                 lp->hw->phy->supported.cca_ed_levels = at86rf233_ed_levels;
1605                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf233_ed_levels);
1606                 break;
1607         default:
1608                 chip = "unknown";
1609                 rc = -ENOTSUPP;
1610                 goto not_supp;
1611         }
1612 
1613         lp->hw->phy->cca_ed_level = lp->hw->phy->supported.cca_ed_levels[7];
1614         lp->hw->phy->transmit_power = lp->hw->phy->supported.tx_powers[0];
1615 
1616 not_supp:
1617         dev_info(&lp->spi->dev, "Detected %s chip version %d\n", chip, version);
1618 
1619         return rc;
1620 }
1621 
1622 #ifdef CONFIG_IEEE802154_AT86RF230_DEBUGFS
1623 static struct dentry *at86rf230_debugfs_root;
1624 
1625 static int at86rf230_stats_show(struct seq_file *file, void *offset)
1626 {
1627         struct at86rf230_local *lp = file->private;
1628 
1629         seq_printf(file, "SUCCESS:\t\t%8llu\n", lp->trac.success);
1630         seq_printf(file, "SUCCESS_DATA_PENDING:\t%8llu\n",
1631                    lp->trac.success_data_pending);
1632         seq_printf(file, "SUCCESS_WAIT_FOR_ACK:\t%8llu\n",
1633                    lp->trac.success_wait_for_ack);
1634         seq_printf(file, "CHANNEL_ACCESS_FAILURE:\t%8llu\n",
1635                    lp->trac.channel_access_failure);
1636         seq_printf(file, "NO_ACK:\t\t\t%8llu\n", lp->trac.no_ack);
1637         seq_printf(file, "INVALID:\t\t%8llu\n", lp->trac.invalid);
1638         return 0;
1639 }
1640 
1641 static int at86rf230_stats_open(struct inode *inode, struct file *file)
1642 {
1643         return single_open(file, at86rf230_stats_show, inode->i_private);
1644 }
1645 
1646 static const struct file_operations at86rf230_stats_fops = {
1647         .open           = at86rf230_stats_open,
1648         .read           = seq_read,
1649         .llseek         = seq_lseek,
1650         .release        = single_release,
1651 };
1652 
1653 static int at86rf230_debugfs_init(struct at86rf230_local *lp)
1654 {
1655         char debugfs_dir_name[DNAME_INLINE_LEN + 1] = "at86rf230-";
1656         struct dentry *stats;
1657 
1658         strncat(debugfs_dir_name, dev_name(&lp->spi->dev), DNAME_INLINE_LEN);
1659 
1660         at86rf230_debugfs_root = debugfs_create_dir(debugfs_dir_name, NULL);
1661         if (!at86rf230_debugfs_root)
1662                 return -ENOMEM;
1663 
1664         stats = debugfs_create_file("trac_stats", S_IRUGO,
1665                                     at86rf230_debugfs_root, lp,
1666                                     &at86rf230_stats_fops);
1667         if (!stats)
1668                 return -ENOMEM;
1669 
1670         return 0;
1671 }
1672 
1673 static void at86rf230_debugfs_remove(void)
1674 {
1675         debugfs_remove_recursive(at86rf230_debugfs_root);
1676 }
1677 #else
1678 static int at86rf230_debugfs_init(struct at86rf230_local *lp) { return 0; }
1679 static void at86rf230_debugfs_remove(void) { }
1680 #endif
1681 
1682 static int at86rf230_probe(struct spi_device *spi)
1683 {
1684         struct ieee802154_hw *hw;
1685         struct at86rf230_local *lp;
1686         unsigned int status;
1687         int rc, irq_type, rstn, slp_tr;
1688         u8 xtal_trim = 0;
1689 
1690         if (!spi->irq) {
1691                 dev_err(&spi->dev, "no IRQ specified\n");
1692                 return -EINVAL;
1693         }
1694 
1695         rc = at86rf230_get_pdata(spi, &rstn, &slp_tr, &xtal_trim);
1696         if (rc < 0) {
1697                 dev_err(&spi->dev, "failed to parse platform_data: %d\n", rc);
1698                 return rc;
1699         }
1700 
1701         if (gpio_is_valid(rstn)) {
1702                 rc = devm_gpio_request_one(&spi->dev, rstn,
1703                                            GPIOF_OUT_INIT_HIGH, "rstn");
1704                 if (rc)
1705                         return rc;
1706         }
1707 
1708         if (gpio_is_valid(slp_tr)) {
1709                 rc = devm_gpio_request_one(&spi->dev, slp_tr,
1710                                            GPIOF_OUT_INIT_LOW, "slp_tr");
1711                 if (rc)
1712                         return rc;
1713         }
1714 
1715         /* Reset */
1716         if (gpio_is_valid(rstn)) {
1717                 udelay(1);
1718                 gpio_set_value_cansleep(rstn, 0);
1719                 udelay(1);
1720                 gpio_set_value_cansleep(rstn, 1);
1721                 usleep_range(120, 240);
1722         }
1723 
1724         hw = ieee802154_alloc_hw(sizeof(*lp), &at86rf230_ops);
1725         if (!hw)
1726                 return -ENOMEM;
1727 
1728         lp = hw->priv;
1729         lp->hw = hw;
1730         lp->spi = spi;
1731         lp->slp_tr = slp_tr;
1732         hw->parent = &spi->dev;
1733         ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
1734 
1735         lp->regmap = devm_regmap_init_spi(spi, &at86rf230_regmap_spi_config);
1736         if (IS_ERR(lp->regmap)) {
1737                 rc = PTR_ERR(lp->regmap);
1738                 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
1739                         rc);
1740                 goto free_dev;
1741         }
1742 
1743         at86rf230_setup_spi_messages(lp, &lp->state);
1744         at86rf230_setup_spi_messages(lp, &lp->tx);
1745 
1746         rc = at86rf230_detect_device(lp);
1747         if (rc < 0)
1748                 goto free_dev;
1749 
1750         init_completion(&lp->state_complete);
1751 
1752         spi_set_drvdata(spi, lp);
1753 
1754         rc = at86rf230_hw_init(lp, xtal_trim);
1755         if (rc)
1756                 goto free_dev;
1757 
1758         /* Read irq status register to reset irq line */
1759         rc = at86rf230_read_subreg(lp, RG_IRQ_STATUS, 0xff, 0, &status);
1760         if (rc)
1761                 goto free_dev;
1762 
1763         irq_type = irq_get_trigger_type(spi->irq);
1764         if (!irq_type)
1765                 irq_type = IRQF_TRIGGER_HIGH;
1766 
1767         rc = devm_request_irq(&spi->dev, spi->irq, at86rf230_isr,
1768                               IRQF_SHARED | irq_type, dev_name(&spi->dev), lp);
1769         if (rc)
1770                 goto free_dev;
1771 
1772         /* disable_irq by default and wait for starting hardware */
1773         disable_irq(spi->irq);
1774 
1775         /* going into sleep by default */
1776         at86rf230_sleep(lp);
1777 
1778         rc = at86rf230_debugfs_init(lp);
1779         if (rc)
1780                 goto free_dev;
1781 
1782         rc = ieee802154_register_hw(lp->hw);
1783         if (rc)
1784                 goto free_debugfs;
1785 
1786         return rc;
1787 
1788 free_debugfs:
1789         at86rf230_debugfs_remove();
1790 free_dev:
1791         ieee802154_free_hw(lp->hw);
1792 
1793         return rc;
1794 }
1795 
1796 static int at86rf230_remove(struct spi_device *spi)
1797 {
1798         struct at86rf230_local *lp = spi_get_drvdata(spi);
1799 
1800         /* mask all at86rf230 irq's */
1801         at86rf230_write_subreg(lp, SR_IRQ_MASK, 0);
1802         ieee802154_unregister_hw(lp->hw);
1803         ieee802154_free_hw(lp->hw);
1804         at86rf230_debugfs_remove();
1805         dev_dbg(&spi->dev, "unregistered at86rf230\n");
1806 
1807         return 0;
1808 }
1809 
1810 static const struct of_device_id at86rf230_of_match[] = {
1811         { .compatible = "atmel,at86rf230", },
1812         { .compatible = "atmel,at86rf231", },
1813         { .compatible = "atmel,at86rf233", },
1814         { .compatible = "atmel,at86rf212", },
1815         { },
1816 };
1817 MODULE_DEVICE_TABLE(of, at86rf230_of_match);
1818 
1819 static const struct spi_device_id at86rf230_device_id[] = {
1820         { .name = "at86rf230", },
1821         { .name = "at86rf231", },
1822         { .name = "at86rf233", },
1823         { .name = "at86rf212", },
1824         { },
1825 };
1826 MODULE_DEVICE_TABLE(spi, at86rf230_device_id);
1827 
1828 static struct spi_driver at86rf230_driver = {
1829         .id_table = at86rf230_device_id,
1830         .driver = {
1831                 .of_match_table = of_match_ptr(at86rf230_of_match),
1832                 .name   = "at86rf230",
1833         },
1834         .probe      = at86rf230_probe,
1835         .remove     = at86rf230_remove,
1836 };
1837 
1838 module_spi_driver(at86rf230_driver);
1839 
1840 MODULE_DESCRIPTION("AT86RF230 Transceiver Driver");
1841 MODULE_LICENSE("GPL v2");
1842 

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