Version:  2.0.40 2.2.26 2.4.37 3.10 3.11 3.12 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

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 = ktime_set(0, c->t_off_to_aack * NSEC_PER_USEC);
514                         /* state change from TRX_OFF to RX_AACK_ON to do a
515                          * calibration, we need to reset the timeout for the
516                          * next one.
517                          */
518                         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
519                         goto change;
520                 case STATE_TX_ARET_ON:
521                 case STATE_TX_ON:
522                         tim = ktime_set(0, c->t_off_to_tx_on * NSEC_PER_USEC);
523                         /* state change from TRX_OFF to TX_ON or ARET_ON to do
524                          * a calibration, we need to reset the timeout for the
525                          * next one.
526                          */
527                         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
528                         goto change;
529                 default:
530                         break;
531                 }
532                 break;
533         case STATE_BUSY_RX_AACK:
534                 switch (ctx->to_state) {
535                 case STATE_TRX_OFF:
536                 case STATE_TX_ON:
537                         /* Wait for worst case receiving time if we
538                          * didn't make a force change from BUSY_RX_AACK
539                          * to TX_ON or TRX_OFF.
540                          */
541                         if (!force) {
542                                 tim = ktime_set(0, (c->t_frame + c->t_p_ack) *
543                                                    NSEC_PER_USEC);
544                                 goto change;
545                         }
546                         break;
547                 default:
548                         break;
549                 }
550                 break;
551         /* Default value, means RESET state */
552         case STATE_P_ON:
553                 switch (ctx->to_state) {
554                 case STATE_TRX_OFF:
555                         tim = ktime_set(0, c->t_reset_to_off * NSEC_PER_USEC);
556                         goto change;
557                 default:
558                         break;
559                 }
560                 break;
561         default:
562                 break;
563         }
564 
565         /* Default delay is 1us in the most cases */
566         udelay(1);
567         at86rf230_async_state_timer(&ctx->timer);
568         return;
569 
570 change:
571         hrtimer_start(&ctx->timer, tim, HRTIMER_MODE_REL);
572 }
573 
574 static void
575 at86rf230_async_state_change_start(void *context)
576 {
577         struct at86rf230_state_change *ctx = context;
578         struct at86rf230_local *lp = ctx->lp;
579         u8 *buf = ctx->buf;
580         const u8 trx_state = buf[1] & TRX_STATE_MASK;
581 
582         /* Check for "possible" STATE_TRANSITION_IN_PROGRESS */
583         if (trx_state == STATE_TRANSITION_IN_PROGRESS) {
584                 udelay(1);
585                 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
586                                          at86rf230_async_state_change_start);
587                 return;
588         }
589 
590         /* Check if we already are in the state which we change in */
591         if (trx_state == ctx->to_state) {
592                 if (ctx->complete)
593                         ctx->complete(context);
594                 return;
595         }
596 
597         /* Set current state to the context of state change */
598         ctx->from_state = trx_state;
599 
600         /* Going into the next step for a state change which do a timing
601          * relevant delay.
602          */
603         at86rf230_async_write_reg(lp, RG_TRX_STATE, ctx->to_state, ctx,
604                                   at86rf230_async_state_delay);
605 }
606 
607 static void
608 at86rf230_async_state_change(struct at86rf230_local *lp,
609                              struct at86rf230_state_change *ctx,
610                              const u8 state, void (*complete)(void *context))
611 {
612         /* Initialization for the state change context */
613         ctx->to_state = state;
614         ctx->complete = complete;
615         at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
616                                  at86rf230_async_state_change_start);
617 }
618 
619 static void
620 at86rf230_sync_state_change_complete(void *context)
621 {
622         struct at86rf230_state_change *ctx = context;
623         struct at86rf230_local *lp = ctx->lp;
624 
625         complete(&lp->state_complete);
626 }
627 
628 /* This function do a sync framework above the async state change.
629  * Some callbacks of the IEEE 802.15.4 driver interface need to be
630  * handled synchronously.
631  */
632 static int
633 at86rf230_sync_state_change(struct at86rf230_local *lp, unsigned int state)
634 {
635         unsigned long rc;
636 
637         at86rf230_async_state_change(lp, &lp->state, state,
638                                      at86rf230_sync_state_change_complete);
639 
640         rc = wait_for_completion_timeout(&lp->state_complete,
641                                          msecs_to_jiffies(100));
642         if (!rc) {
643                 at86rf230_async_error(lp, &lp->state, -ETIMEDOUT);
644                 return -ETIMEDOUT;
645         }
646 
647         return 0;
648 }
649 
650 static void
651 at86rf230_tx_complete(void *context)
652 {
653         struct at86rf230_state_change *ctx = context;
654         struct at86rf230_local *lp = ctx->lp;
655 
656         ieee802154_xmit_complete(lp->hw, lp->tx_skb, false);
657         kfree(ctx);
658 }
659 
660 static void
661 at86rf230_tx_on(void *context)
662 {
663         struct at86rf230_state_change *ctx = context;
664         struct at86rf230_local *lp = ctx->lp;
665 
666         at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON,
667                                      at86rf230_tx_complete);
668 }
669 
670 static void
671 at86rf230_tx_trac_check(void *context)
672 {
673         struct at86rf230_state_change *ctx = context;
674         struct at86rf230_local *lp = ctx->lp;
675 
676         if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS)) {
677                 u8 trac = TRAC_MASK(ctx->buf[1]);
678 
679                 switch (trac) {
680                 case TRAC_SUCCESS:
681                         lp->trac.success++;
682                         break;
683                 case TRAC_SUCCESS_DATA_PENDING:
684                         lp->trac.success_data_pending++;
685                         break;
686                 case TRAC_CHANNEL_ACCESS_FAILURE:
687                         lp->trac.channel_access_failure++;
688                         break;
689                 case TRAC_NO_ACK:
690                         lp->trac.no_ack++;
691                         break;
692                 case TRAC_INVALID:
693                         lp->trac.invalid++;
694                         break;
695                 default:
696                         WARN_ONCE(1, "received tx trac status %d\n", trac);
697                         break;
698                 }
699         }
700 
701         at86rf230_async_state_change(lp, ctx, STATE_TX_ON, at86rf230_tx_on);
702 }
703 
704 static void
705 at86rf230_rx_read_frame_complete(void *context)
706 {
707         struct at86rf230_state_change *ctx = context;
708         struct at86rf230_local *lp = ctx->lp;
709         const u8 *buf = ctx->buf;
710         struct sk_buff *skb;
711         u8 len, lqi;
712 
713         len = buf[1];
714         if (!ieee802154_is_valid_psdu_len(len)) {
715                 dev_vdbg(&lp->spi->dev, "corrupted frame received\n");
716                 len = IEEE802154_MTU;
717         }
718         lqi = buf[2 + len];
719 
720         skb = dev_alloc_skb(IEEE802154_MTU);
721         if (!skb) {
722                 dev_vdbg(&lp->spi->dev, "failed to allocate sk_buff\n");
723                 kfree(ctx);
724                 return;
725         }
726 
727         memcpy(skb_put(skb, len), buf + 2, len);
728         ieee802154_rx_irqsafe(lp->hw, skb, lqi);
729         kfree(ctx);
730 }
731 
732 static void
733 at86rf230_rx_trac_check(void *context)
734 {
735         struct at86rf230_state_change *ctx = context;
736         struct at86rf230_local *lp = ctx->lp;
737         u8 *buf = ctx->buf;
738         int rc;
739 
740         if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS)) {
741                 u8 trac = TRAC_MASK(buf[1]);
742 
743                 switch (trac) {
744                 case TRAC_SUCCESS:
745                         lp->trac.success++;
746                         break;
747                 case TRAC_SUCCESS_WAIT_FOR_ACK:
748                         lp->trac.success_wait_for_ack++;
749                         break;
750                 case TRAC_INVALID:
751                         lp->trac.invalid++;
752                         break;
753                 default:
754                         WARN_ONCE(1, "received rx trac status %d\n", trac);
755                         break;
756                 }
757         }
758 
759         buf[0] = CMD_FB;
760         ctx->trx.len = AT86RF2XX_MAX_BUF;
761         ctx->msg.complete = at86rf230_rx_read_frame_complete;
762         rc = spi_async(lp->spi, &ctx->msg);
763         if (rc) {
764                 ctx->trx.len = 2;
765                 at86rf230_async_error(lp, ctx, rc);
766         }
767 }
768 
769 static void
770 at86rf230_irq_trx_end(void *context)
771 {
772         struct at86rf230_state_change *ctx = context;
773         struct at86rf230_local *lp = ctx->lp;
774 
775         if (lp->is_tx) {
776                 lp->is_tx = 0;
777                 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx,
778                                          at86rf230_tx_trac_check);
779         } else {
780                 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx,
781                                          at86rf230_rx_trac_check);
782         }
783 }
784 
785 static void
786 at86rf230_irq_status(void *context)
787 {
788         struct at86rf230_state_change *ctx = context;
789         struct at86rf230_local *lp = ctx->lp;
790         const u8 *buf = ctx->buf;
791         u8 irq = buf[1];
792 
793         enable_irq(lp->spi->irq);
794 
795         if (irq & IRQ_TRX_END) {
796                 at86rf230_irq_trx_end(ctx);
797         } else {
798                 dev_err(&lp->spi->dev, "not supported irq %02x received\n",
799                         irq);
800                 kfree(ctx);
801         }
802 }
803 
804 static void
805 at86rf230_setup_spi_messages(struct at86rf230_local *lp,
806                              struct at86rf230_state_change *state)
807 {
808         state->lp = lp;
809         state->irq = lp->spi->irq;
810         spi_message_init(&state->msg);
811         state->msg.context = state;
812         state->trx.len = 2;
813         state->trx.tx_buf = state->buf;
814         state->trx.rx_buf = state->buf;
815         spi_message_add_tail(&state->trx, &state->msg);
816         hrtimer_init(&state->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
817         state->timer.function = at86rf230_async_state_timer;
818 }
819 
820 static irqreturn_t at86rf230_isr(int irq, void *data)
821 {
822         struct at86rf230_local *lp = data;
823         struct at86rf230_state_change *ctx;
824         int rc;
825 
826         disable_irq_nosync(irq);
827 
828         ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
829         if (!ctx) {
830                 enable_irq(irq);
831                 return IRQ_NONE;
832         }
833 
834         at86rf230_setup_spi_messages(lp, ctx);
835         /* tell on error handling to free ctx */
836         ctx->free = true;
837 
838         ctx->buf[0] = (RG_IRQ_STATUS & CMD_REG_MASK) | CMD_REG;
839         ctx->msg.complete = at86rf230_irq_status;
840         rc = spi_async(lp->spi, &ctx->msg);
841         if (rc) {
842                 at86rf230_async_error(lp, ctx, rc);
843                 enable_irq(irq);
844                 return IRQ_NONE;
845         }
846 
847         return IRQ_HANDLED;
848 }
849 
850 static void
851 at86rf230_write_frame_complete(void *context)
852 {
853         struct at86rf230_state_change *ctx = context;
854         struct at86rf230_local *lp = ctx->lp;
855 
856         ctx->trx.len = 2;
857 
858         if (gpio_is_valid(lp->slp_tr))
859                 at86rf230_slp_tr_rising_edge(lp);
860         else
861                 at86rf230_async_write_reg(lp, RG_TRX_STATE, STATE_BUSY_TX, ctx,
862                                           NULL);
863 }
864 
865 static void
866 at86rf230_write_frame(void *context)
867 {
868         struct at86rf230_state_change *ctx = context;
869         struct at86rf230_local *lp = ctx->lp;
870         struct sk_buff *skb = lp->tx_skb;
871         u8 *buf = ctx->buf;
872         int rc;
873 
874         lp->is_tx = 1;
875 
876         buf[0] = CMD_FB | CMD_WRITE;
877         buf[1] = skb->len + 2;
878         memcpy(buf + 2, skb->data, skb->len);
879         ctx->trx.len = skb->len + 2;
880         ctx->msg.complete = at86rf230_write_frame_complete;
881         rc = spi_async(lp->spi, &ctx->msg);
882         if (rc) {
883                 ctx->trx.len = 2;
884                 at86rf230_async_error(lp, ctx, rc);
885         }
886 }
887 
888 static void
889 at86rf230_xmit_tx_on(void *context)
890 {
891         struct at86rf230_state_change *ctx = context;
892         struct at86rf230_local *lp = ctx->lp;
893 
894         at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
895                                      at86rf230_write_frame);
896 }
897 
898 static void
899 at86rf230_xmit_start(void *context)
900 {
901         struct at86rf230_state_change *ctx = context;
902         struct at86rf230_local *lp = ctx->lp;
903 
904         /* check if we change from off state */
905         if (lp->is_tx_from_off)
906                 at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
907                                              at86rf230_write_frame);
908         else
909                 at86rf230_async_state_change(lp, ctx, STATE_TX_ON,
910                                              at86rf230_xmit_tx_on);
911 }
912 
913 static int
914 at86rf230_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
915 {
916         struct at86rf230_local *lp = hw->priv;
917         struct at86rf230_state_change *ctx = &lp->tx;
918 
919         lp->tx_skb = skb;
920         lp->tx_retry = 0;
921 
922         /* After 5 minutes in PLL and the same frequency we run again the
923          * calibration loops which is recommended by at86rf2xx datasheets.
924          *
925          * The calibration is initiate by a state change from TRX_OFF
926          * to TX_ON, the lp->cal_timeout should be reinit by state_delay
927          * function then to start in the next 5 minutes.
928          */
929         if (time_is_before_jiffies(lp->cal_timeout)) {
930                 lp->is_tx_from_off = true;
931                 at86rf230_async_state_change(lp, ctx, STATE_TRX_OFF,
932                                              at86rf230_xmit_start);
933         } else {
934                 lp->is_tx_from_off = false;
935                 at86rf230_xmit_start(ctx);
936         }
937 
938         return 0;
939 }
940 
941 static int
942 at86rf230_ed(struct ieee802154_hw *hw, u8 *level)
943 {
944         BUG_ON(!level);
945         *level = 0xbe;
946         return 0;
947 }
948 
949 static int
950 at86rf230_start(struct ieee802154_hw *hw)
951 {
952         struct at86rf230_local *lp = hw->priv;
953 
954         /* reset trac stats on start */
955         if (IS_ENABLED(CONFIG_IEEE802154_AT86RF230_DEBUGFS))
956                 memset(&lp->trac, 0, sizeof(struct at86rf230_trac));
957 
958         at86rf230_awake(lp);
959         enable_irq(lp->spi->irq);
960 
961         return at86rf230_sync_state_change(lp, STATE_RX_AACK_ON);
962 }
963 
964 static void
965 at86rf230_stop(struct ieee802154_hw *hw)
966 {
967         struct at86rf230_local *lp = hw->priv;
968         u8 csma_seed[2];
969 
970         at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
971 
972         disable_irq(lp->spi->irq);
973 
974         /* It's recommended to set random new csma_seeds before sleep state.
975          * Makes only sense in the stop callback, not doing this inside of
976          * at86rf230_sleep, this is also used when we don't transmit afterwards
977          * when calling start callback again.
978          */
979         get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
980         at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
981         at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
982 
983         at86rf230_sleep(lp);
984 }
985 
986 static int
987 at86rf23x_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
988 {
989         return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
990 }
991 
992 #define AT86RF2XX_MAX_ED_LEVELS 0xF
993 static const s32 at86rf23x_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = {
994         -9100, -8900, -8700, -8500, -8300, -8100, -7900, -7700, -7500, -7300,
995         -7100, -6900, -6700, -6500, -6300, -6100,
996 };
997 
998 static const s32 at86rf212_ed_levels_100[AT86RF2XX_MAX_ED_LEVELS + 1] = {
999         -10000, -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200,
1000         -8000, -7800, -7600, -7400, -7200, -7000,
1001 };
1002 
1003 static const s32 at86rf212_ed_levels_98[AT86RF2XX_MAX_ED_LEVELS + 1] = {
1004         -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000,
1005         -7800, -7600, -7400, -7200, -7000, -6800,
1006 };
1007 
1008 static inline int
1009 at86rf212_update_cca_ed_level(struct at86rf230_local *lp, int rssi_base_val)
1010 {
1011         unsigned int cca_ed_thres;
1012         int rc;
1013 
1014         rc = at86rf230_read_subreg(lp, SR_CCA_ED_THRES, &cca_ed_thres);
1015         if (rc < 0)
1016                 return rc;
1017 
1018         switch (rssi_base_val) {
1019         case -98:
1020                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_98;
1021                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_98);
1022                 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_98[cca_ed_thres];
1023                 break;
1024         case -100:
1025                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
1026                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
1027                 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_100[cca_ed_thres];
1028                 break;
1029         default:
1030                 WARN_ON(1);
1031         }
1032 
1033         return 0;
1034 }
1035 
1036 static int
1037 at86rf212_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
1038 {
1039         int rc;
1040 
1041         if (channel == 0)
1042                 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 0);
1043         else
1044                 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 1);
1045         if (rc < 0)
1046                 return rc;
1047 
1048         if (page == 0) {
1049                 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 0);
1050                 lp->data->rssi_base_val = -100;
1051         } else {
1052                 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 1);
1053                 lp->data->rssi_base_val = -98;
1054         }
1055         if (rc < 0)
1056                 return rc;
1057 
1058         rc = at86rf212_update_cca_ed_level(lp, lp->data->rssi_base_val);
1059         if (rc < 0)
1060                 return rc;
1061 
1062         /* This sets the symbol_duration according frequency on the 212.
1063          * TODO move this handling while set channel and page in cfg802154.
1064          * We can do that, this timings are according 802.15.4 standard.
1065          * If we do that in cfg802154, this is a more generic calculation.
1066          *
1067          * This should also protected from ifs_timer. Means cancel timer and
1068          * init with a new value. For now, this is okay.
1069          */
1070         if (channel == 0) {
1071                 if (page == 0) {
1072                         /* SUB:0 and BPSK:0 -> BPSK-20 */
1073                         lp->hw->phy->symbol_duration = 50;
1074                 } else {
1075                         /* SUB:1 and BPSK:0 -> BPSK-40 */
1076                         lp->hw->phy->symbol_duration = 25;
1077                 }
1078         } else {
1079                 if (page == 0)
1080                         /* SUB:0 and BPSK:1 -> OQPSK-100/200/400 */
1081                         lp->hw->phy->symbol_duration = 40;
1082                 else
1083                         /* SUB:1 and BPSK:1 -> OQPSK-250/500/1000 */
1084                         lp->hw->phy->symbol_duration = 16;
1085         }
1086 
1087         lp->hw->phy->lifs_period = IEEE802154_LIFS_PERIOD *
1088                                    lp->hw->phy->symbol_duration;
1089         lp->hw->phy->sifs_period = IEEE802154_SIFS_PERIOD *
1090                                    lp->hw->phy->symbol_duration;
1091 
1092         return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
1093 }
1094 
1095 static int
1096 at86rf230_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
1097 {
1098         struct at86rf230_local *lp = hw->priv;
1099         int rc;
1100 
1101         rc = lp->data->set_channel(lp, page, channel);
1102         /* Wait for PLL */
1103         usleep_range(lp->data->t_channel_switch,
1104                      lp->data->t_channel_switch + 10);
1105 
1106         lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
1107         return rc;
1108 }
1109 
1110 static int
1111 at86rf230_set_hw_addr_filt(struct ieee802154_hw *hw,
1112                            struct ieee802154_hw_addr_filt *filt,
1113                            unsigned long changed)
1114 {
1115         struct at86rf230_local *lp = hw->priv;
1116 
1117         if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
1118                 u16 addr = le16_to_cpu(filt->short_addr);
1119 
1120                 dev_vdbg(&lp->spi->dev,
1121                          "at86rf230_set_hw_addr_filt called for saddr\n");
1122                 __at86rf230_write(lp, RG_SHORT_ADDR_0, addr);
1123                 __at86rf230_write(lp, RG_SHORT_ADDR_1, addr >> 8);
1124         }
1125 
1126         if (changed & IEEE802154_AFILT_PANID_CHANGED) {
1127                 u16 pan = le16_to_cpu(filt->pan_id);
1128 
1129                 dev_vdbg(&lp->spi->dev,
1130                          "at86rf230_set_hw_addr_filt called for pan id\n");
1131                 __at86rf230_write(lp, RG_PAN_ID_0, pan);
1132                 __at86rf230_write(lp, RG_PAN_ID_1, pan >> 8);
1133         }
1134 
1135         if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
1136                 u8 i, addr[8];
1137 
1138                 memcpy(addr, &filt->ieee_addr, 8);
1139                 dev_vdbg(&lp->spi->dev,
1140                          "at86rf230_set_hw_addr_filt called for IEEE addr\n");
1141                 for (i = 0; i < 8; i++)
1142                         __at86rf230_write(lp, RG_IEEE_ADDR_0 + i, addr[i]);
1143         }
1144 
1145         if (changed & IEEE802154_AFILT_PANC_CHANGED) {
1146                 dev_vdbg(&lp->spi->dev,
1147                          "at86rf230_set_hw_addr_filt called for panc change\n");
1148                 if (filt->pan_coord)
1149                         at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 1);
1150                 else
1151                         at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 0);
1152         }
1153 
1154         return 0;
1155 }
1156 
1157 #define AT86RF23X_MAX_TX_POWERS 0xF
1158 static const s32 at86rf233_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1159         400, 370, 340, 300, 250, 200, 100, 0, -100, -200, -300, -400, -600,
1160         -800, -1200, -1700,
1161 };
1162 
1163 static const s32 at86rf231_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1164         300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700,
1165         -900, -1200, -1700,
1166 };
1167 
1168 #define AT86RF212_MAX_TX_POWERS 0x1F
1169 static const s32 at86rf212_powers[AT86RF212_MAX_TX_POWERS + 1] = {
1170         500, 400, 300, 200, 100, 0, -100, -200, -300, -400, -500, -600, -700,
1171         -800, -900, -1000, -1100, -1200, -1300, -1400, -1500, -1600, -1700,
1172         -1800, -1900, -2000, -2100, -2200, -2300, -2400, -2500, -2600,
1173 };
1174 
1175 static int
1176 at86rf23x_set_txpower(struct at86rf230_local *lp, s32 mbm)
1177 {
1178         u32 i;
1179 
1180         for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1181                 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1182                         return at86rf230_write_subreg(lp, SR_TX_PWR_23X, i);
1183         }
1184 
1185         return -EINVAL;
1186 }
1187 
1188 static int
1189 at86rf212_set_txpower(struct at86rf230_local *lp, s32 mbm)
1190 {
1191         u32 i;
1192 
1193         for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1194                 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1195                         return at86rf230_write_subreg(lp, SR_TX_PWR_212, i);
1196         }
1197 
1198         return -EINVAL;
1199 }
1200 
1201 static int
1202 at86rf230_set_txpower(struct ieee802154_hw *hw, s32 mbm)
1203 {
1204         struct at86rf230_local *lp = hw->priv;
1205 
1206         return lp->data->set_txpower(lp, mbm);
1207 }
1208 
1209 static int
1210 at86rf230_set_lbt(struct ieee802154_hw *hw, bool on)
1211 {
1212         struct at86rf230_local *lp = hw->priv;
1213 
1214         return at86rf230_write_subreg(lp, SR_CSMA_LBT_MODE, on);
1215 }
1216 
1217 static int
1218 at86rf230_set_cca_mode(struct ieee802154_hw *hw,
1219                        const struct wpan_phy_cca *cca)
1220 {
1221         struct at86rf230_local *lp = hw->priv;
1222         u8 val;
1223 
1224         /* mapping 802.15.4 to driver spec */
1225         switch (cca->mode) {
1226         case NL802154_CCA_ENERGY:
1227                 val = 1;
1228                 break;
1229         case NL802154_CCA_CARRIER:
1230                 val = 2;
1231                 break;
1232         case NL802154_CCA_ENERGY_CARRIER:
1233                 switch (cca->opt) {
1234                 case NL802154_CCA_OPT_ENERGY_CARRIER_AND:
1235                         val = 3;
1236                         break;
1237                 case NL802154_CCA_OPT_ENERGY_CARRIER_OR:
1238                         val = 0;
1239                         break;
1240                 default:
1241                         return -EINVAL;
1242                 }
1243                 break;
1244         default:
1245                 return -EINVAL;
1246         }
1247 
1248         return at86rf230_write_subreg(lp, SR_CCA_MODE, val);
1249 }
1250 
1251 
1252 static int
1253 at86rf230_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
1254 {
1255         struct at86rf230_local *lp = hw->priv;
1256         u32 i;
1257 
1258         for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) {
1259                 if (hw->phy->supported.cca_ed_levels[i] == mbm)
1260                         return at86rf230_write_subreg(lp, SR_CCA_ED_THRES, i);
1261         }
1262 
1263         return -EINVAL;
1264 }
1265 
1266 static int
1267 at86rf230_set_csma_params(struct ieee802154_hw *hw, u8 min_be, u8 max_be,
1268                           u8 retries)
1269 {
1270         struct at86rf230_local *lp = hw->priv;
1271         int rc;
1272 
1273         rc = at86rf230_write_subreg(lp, SR_MIN_BE, min_be);
1274         if (rc)
1275                 return rc;
1276 
1277         rc = at86rf230_write_subreg(lp, SR_MAX_BE, max_be);
1278         if (rc)
1279                 return rc;
1280 
1281         return at86rf230_write_subreg(lp, SR_MAX_CSMA_RETRIES, retries);
1282 }
1283 
1284 static int
1285 at86rf230_set_frame_retries(struct ieee802154_hw *hw, s8 retries)
1286 {
1287         struct at86rf230_local *lp = hw->priv;
1288 
1289         return at86rf230_write_subreg(lp, SR_MAX_FRAME_RETRIES, retries);
1290 }
1291 
1292 static int
1293 at86rf230_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
1294 {
1295         struct at86rf230_local *lp = hw->priv;
1296         int rc;
1297 
1298         if (on) {
1299                 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 1);
1300                 if (rc < 0)
1301                         return rc;
1302 
1303                 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 1);
1304                 if (rc < 0)
1305                         return rc;
1306         } else {
1307                 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 0);
1308                 if (rc < 0)
1309                         return rc;
1310 
1311                 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 0);
1312                 if (rc < 0)
1313                         return rc;
1314         }
1315 
1316         return 0;
1317 }
1318 
1319 static const struct ieee802154_ops at86rf230_ops = {
1320         .owner = THIS_MODULE,
1321         .xmit_async = at86rf230_xmit,
1322         .ed = at86rf230_ed,
1323         .set_channel = at86rf230_channel,
1324         .start = at86rf230_start,
1325         .stop = at86rf230_stop,
1326         .set_hw_addr_filt = at86rf230_set_hw_addr_filt,
1327         .set_txpower = at86rf230_set_txpower,
1328         .set_lbt = at86rf230_set_lbt,
1329         .set_cca_mode = at86rf230_set_cca_mode,
1330         .set_cca_ed_level = at86rf230_set_cca_ed_level,
1331         .set_csma_params = at86rf230_set_csma_params,
1332         .set_frame_retries = at86rf230_set_frame_retries,
1333         .set_promiscuous_mode = at86rf230_set_promiscuous_mode,
1334 };
1335 
1336 static struct at86rf2xx_chip_data at86rf233_data = {
1337         .t_sleep_cycle = 330,
1338         .t_channel_switch = 11,
1339         .t_reset_to_off = 26,
1340         .t_off_to_aack = 80,
1341         .t_off_to_tx_on = 80,
1342         .t_off_to_sleep = 35,
1343         .t_sleep_to_off = 1000,
1344         .t_frame = 4096,
1345         .t_p_ack = 545,
1346         .rssi_base_val = -91,
1347         .set_channel = at86rf23x_set_channel,
1348         .set_txpower = at86rf23x_set_txpower,
1349 };
1350 
1351 static struct at86rf2xx_chip_data at86rf231_data = {
1352         .t_sleep_cycle = 330,
1353         .t_channel_switch = 24,
1354         .t_reset_to_off = 37,
1355         .t_off_to_aack = 110,
1356         .t_off_to_tx_on = 110,
1357         .t_off_to_sleep = 35,
1358         .t_sleep_to_off = 1000,
1359         .t_frame = 4096,
1360         .t_p_ack = 545,
1361         .rssi_base_val = -91,
1362         .set_channel = at86rf23x_set_channel,
1363         .set_txpower = at86rf23x_set_txpower,
1364 };
1365 
1366 static struct at86rf2xx_chip_data at86rf212_data = {
1367         .t_sleep_cycle = 330,
1368         .t_channel_switch = 11,
1369         .t_reset_to_off = 26,
1370         .t_off_to_aack = 200,
1371         .t_off_to_tx_on = 200,
1372         .t_off_to_sleep = 35,
1373         .t_sleep_to_off = 1000,
1374         .t_frame = 4096,
1375         .t_p_ack = 545,
1376         .rssi_base_val = -100,
1377         .set_channel = at86rf212_set_channel,
1378         .set_txpower = at86rf212_set_txpower,
1379 };
1380 
1381 static int at86rf230_hw_init(struct at86rf230_local *lp, u8 xtal_trim)
1382 {
1383         int rc, irq_type, irq_pol = IRQ_ACTIVE_HIGH;
1384         unsigned int dvdd;
1385         u8 csma_seed[2];
1386 
1387         rc = at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
1388         if (rc)
1389                 return rc;
1390 
1391         irq_type = irq_get_trigger_type(lp->spi->irq);
1392         if (irq_type == IRQ_TYPE_EDGE_FALLING ||
1393             irq_type == IRQ_TYPE_LEVEL_LOW)
1394                 irq_pol = IRQ_ACTIVE_LOW;
1395 
1396         rc = at86rf230_write_subreg(lp, SR_IRQ_POLARITY, irq_pol);
1397         if (rc)
1398                 return rc;
1399 
1400         rc = at86rf230_write_subreg(lp, SR_RX_SAFE_MODE, 1);
1401         if (rc)
1402                 return rc;
1403 
1404         rc = at86rf230_write_subreg(lp, SR_IRQ_MASK, IRQ_TRX_END);
1405         if (rc)
1406                 return rc;
1407 
1408         /* reset values differs in at86rf231 and at86rf233 */
1409         rc = at86rf230_write_subreg(lp, SR_IRQ_MASK_MODE, 0);
1410         if (rc)
1411                 return rc;
1412 
1413         get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
1414         rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
1415         if (rc)
1416                 return rc;
1417         rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
1418         if (rc)
1419                 return rc;
1420 
1421         /* CLKM changes are applied immediately */
1422         rc = at86rf230_write_subreg(lp, SR_CLKM_SHA_SEL, 0x00);
1423         if (rc)
1424                 return rc;
1425 
1426         /* Turn CLKM Off */
1427         rc = at86rf230_write_subreg(lp, SR_CLKM_CTRL, 0x00);
1428         if (rc)
1429                 return rc;
1430         /* Wait the next SLEEP cycle */
1431         usleep_range(lp->data->t_sleep_cycle,
1432                      lp->data->t_sleep_cycle + 100);
1433 
1434         /* xtal_trim value is calculated by:
1435          * CL = 0.5 * (CX + CTRIM + CPAR)
1436          *
1437          * whereas:
1438          * CL = capacitor of used crystal
1439          * CX = connected capacitors at xtal pins
1440          * CPAR = in all at86rf2xx datasheets this is a constant value 3 pF,
1441          *        but this is different on each board setup. You need to fine
1442          *        tuning this value via CTRIM.
1443          * CTRIM = variable capacitor setting. Resolution is 0.3 pF range is
1444          *         0 pF upto 4.5 pF.
1445          *
1446          * Examples:
1447          * atben transceiver:
1448          *
1449          * CL = 8 pF
1450          * CX = 12 pF
1451          * CPAR = 3 pF (We assume the magic constant from datasheet)
1452          * CTRIM = 0.9 pF
1453          *
1454          * (12+0.9+3)/2 = 7.95 which is nearly at 8 pF
1455          *
1456          * xtal_trim = 0x3
1457          *
1458          * openlabs transceiver:
1459          *
1460          * CL = 16 pF
1461          * CX = 22 pF
1462          * CPAR = 3 pF (We assume the magic constant from datasheet)
1463          * CTRIM = 4.5 pF
1464          *
1465          * (22+4.5+3)/2 = 14.75 which is the nearest value to 16 pF
1466          *
1467          * xtal_trim = 0xf
1468          */
1469         rc = at86rf230_write_subreg(lp, SR_XTAL_TRIM, xtal_trim);
1470         if (rc)
1471                 return rc;
1472 
1473         rc = at86rf230_read_subreg(lp, SR_DVDD_OK, &dvdd);
1474         if (rc)
1475                 return rc;
1476         if (!dvdd) {
1477                 dev_err(&lp->spi->dev, "DVDD error\n");
1478                 return -EINVAL;
1479         }
1480 
1481         /* Force setting slotted operation bit to 0. Sometimes the atben
1482          * sets this bit and I don't know why. We set this always force
1483          * to zero while probing.
1484          */
1485         return at86rf230_write_subreg(lp, SR_SLOTTED_OPERATION, 0);
1486 }
1487 
1488 static int
1489 at86rf230_get_pdata(struct spi_device *spi, int *rstn, int *slp_tr,
1490                     u8 *xtal_trim)
1491 {
1492         struct at86rf230_platform_data *pdata = spi->dev.platform_data;
1493         int ret;
1494 
1495         if (!IS_ENABLED(CONFIG_OF) || !spi->dev.of_node) {
1496                 if (!pdata)
1497                         return -ENOENT;
1498 
1499                 *rstn = pdata->rstn;
1500                 *slp_tr = pdata->slp_tr;
1501                 *xtal_trim = pdata->xtal_trim;
1502                 return 0;
1503         }
1504 
1505         *rstn = of_get_named_gpio(spi->dev.of_node, "reset-gpio", 0);
1506         *slp_tr = of_get_named_gpio(spi->dev.of_node, "sleep-gpio", 0);
1507         ret = of_property_read_u8(spi->dev.of_node, "xtal-trim", xtal_trim);
1508         if (ret < 0 && ret != -EINVAL)
1509                 return ret;
1510 
1511         return 0;
1512 }
1513 
1514 static int
1515 at86rf230_detect_device(struct at86rf230_local *lp)
1516 {
1517         unsigned int part, version, val;
1518         u16 man_id = 0;
1519         const char *chip;
1520         int rc;
1521 
1522         rc = __at86rf230_read(lp, RG_MAN_ID_0, &val);
1523         if (rc)
1524                 return rc;
1525         man_id |= val;
1526 
1527         rc = __at86rf230_read(lp, RG_MAN_ID_1, &val);
1528         if (rc)
1529                 return rc;
1530         man_id |= (val << 8);
1531 
1532         rc = __at86rf230_read(lp, RG_PART_NUM, &part);
1533         if (rc)
1534                 return rc;
1535 
1536         rc = __at86rf230_read(lp, RG_VERSION_NUM, &version);
1537         if (rc)
1538                 return rc;
1539 
1540         if (man_id != 0x001f) {
1541                 dev_err(&lp->spi->dev, "Non-Atmel dev found (MAN_ID %02x %02x)\n",
1542                         man_id >> 8, man_id & 0xFF);
1543                 return -EINVAL;
1544         }
1545 
1546         lp->hw->flags = IEEE802154_HW_TX_OMIT_CKSUM |
1547                         IEEE802154_HW_CSMA_PARAMS |
1548                         IEEE802154_HW_FRAME_RETRIES | IEEE802154_HW_AFILT |
1549                         IEEE802154_HW_PROMISCUOUS;
1550 
1551         lp->hw->phy->flags = WPAN_PHY_FLAG_TXPOWER |
1552                              WPAN_PHY_FLAG_CCA_ED_LEVEL |
1553                              WPAN_PHY_FLAG_CCA_MODE;
1554 
1555         lp->hw->phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY) |
1556                 BIT(NL802154_CCA_CARRIER) | BIT(NL802154_CCA_ENERGY_CARRIER);
1557         lp->hw->phy->supported.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND) |
1558                 BIT(NL802154_CCA_OPT_ENERGY_CARRIER_OR);
1559 
1560         lp->hw->phy->supported.cca_ed_levels = at86rf23x_ed_levels;
1561         lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf23x_ed_levels);
1562 
1563         lp->hw->phy->cca.mode = NL802154_CCA_ENERGY;
1564 
1565         switch (part) {
1566         case 2:
1567                 chip = "at86rf230";
1568                 rc = -ENOTSUPP;
1569                 goto not_supp;
1570         case 3:
1571                 chip = "at86rf231";
1572                 lp->data = &at86rf231_data;
1573                 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1574                 lp->hw->phy->current_channel = 11;
1575                 lp->hw->phy->symbol_duration = 16;
1576                 lp->hw->phy->supported.tx_powers = at86rf231_powers;
1577                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf231_powers);
1578                 break;
1579         case 7:
1580                 chip = "at86rf212";
1581                 lp->data = &at86rf212_data;
1582                 lp->hw->flags |= IEEE802154_HW_LBT;
1583                 lp->hw->phy->supported.channels[0] = 0x00007FF;
1584                 lp->hw->phy->supported.channels[2] = 0x00007FF;
1585                 lp->hw->phy->current_channel = 5;
1586                 lp->hw->phy->symbol_duration = 25;
1587                 lp->hw->phy->supported.lbt = NL802154_SUPPORTED_BOOL_BOTH;
1588                 lp->hw->phy->supported.tx_powers = at86rf212_powers;
1589                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf212_powers);
1590                 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
1591                 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
1592                 break;
1593         case 11:
1594                 chip = "at86rf233";
1595                 lp->data = &at86rf233_data;
1596                 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1597                 lp->hw->phy->current_channel = 13;
1598                 lp->hw->phy->symbol_duration = 16;
1599                 lp->hw->phy->supported.tx_powers = at86rf233_powers;
1600                 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf233_powers);
1601                 break;
1602         default:
1603                 chip = "unknown";
1604                 rc = -ENOTSUPP;
1605                 goto not_supp;
1606         }
1607 
1608         lp->hw->phy->cca_ed_level = lp->hw->phy->supported.cca_ed_levels[7];
1609         lp->hw->phy->transmit_power = lp->hw->phy->supported.tx_powers[0];
1610 
1611 not_supp:
1612         dev_info(&lp->spi->dev, "Detected %s chip version %d\n", chip, version);
1613 
1614         return rc;
1615 }
1616 
1617 #ifdef CONFIG_IEEE802154_AT86RF230_DEBUGFS
1618 static struct dentry *at86rf230_debugfs_root;
1619 
1620 static int at86rf230_stats_show(struct seq_file *file, void *offset)
1621 {
1622         struct at86rf230_local *lp = file->private;
1623 
1624         seq_printf(file, "SUCCESS:\t\t%8llu\n", lp->trac.success);
1625         seq_printf(file, "SUCCESS_DATA_PENDING:\t%8llu\n",
1626                    lp->trac.success_data_pending);
1627         seq_printf(file, "SUCCESS_WAIT_FOR_ACK:\t%8llu\n",
1628                    lp->trac.success_wait_for_ack);
1629         seq_printf(file, "CHANNEL_ACCESS_FAILURE:\t%8llu\n",
1630                    lp->trac.channel_access_failure);
1631         seq_printf(file, "NO_ACK:\t\t\t%8llu\n", lp->trac.no_ack);
1632         seq_printf(file, "INVALID:\t\t%8llu\n", lp->trac.invalid);
1633         return 0;
1634 }
1635 
1636 static int at86rf230_stats_open(struct inode *inode, struct file *file)
1637 {
1638         return single_open(file, at86rf230_stats_show, inode->i_private);
1639 }
1640 
1641 static const struct file_operations at86rf230_stats_fops = {
1642         .open           = at86rf230_stats_open,
1643         .read           = seq_read,
1644         .llseek         = seq_lseek,
1645         .release        = single_release,
1646 };
1647 
1648 static int at86rf230_debugfs_init(struct at86rf230_local *lp)
1649 {
1650         char debugfs_dir_name[DNAME_INLINE_LEN + 1] = "at86rf230-";
1651         struct dentry *stats;
1652 
1653         strncat(debugfs_dir_name, dev_name(&lp->spi->dev), DNAME_INLINE_LEN);
1654 
1655         at86rf230_debugfs_root = debugfs_create_dir(debugfs_dir_name, NULL);
1656         if (!at86rf230_debugfs_root)
1657                 return -ENOMEM;
1658 
1659         stats = debugfs_create_file("trac_stats", S_IRUGO,
1660                                     at86rf230_debugfs_root, lp,
1661                                     &at86rf230_stats_fops);
1662         if (!stats)
1663                 return -ENOMEM;
1664 
1665         return 0;
1666 }
1667 
1668 static void at86rf230_debugfs_remove(void)
1669 {
1670         debugfs_remove_recursive(at86rf230_debugfs_root);
1671 }
1672 #else
1673 static int at86rf230_debugfs_init(struct at86rf230_local *lp) { return 0; }
1674 static void at86rf230_debugfs_remove(void) { }
1675 #endif
1676 
1677 static int at86rf230_probe(struct spi_device *spi)
1678 {
1679         struct ieee802154_hw *hw;
1680         struct at86rf230_local *lp;
1681         unsigned int status;
1682         int rc, irq_type, rstn, slp_tr;
1683         u8 xtal_trim = 0;
1684 
1685         if (!spi->irq) {
1686                 dev_err(&spi->dev, "no IRQ specified\n");
1687                 return -EINVAL;
1688         }
1689 
1690         rc = at86rf230_get_pdata(spi, &rstn, &slp_tr, &xtal_trim);
1691         if (rc < 0) {
1692                 dev_err(&spi->dev, "failed to parse platform_data: %d\n", rc);
1693                 return rc;
1694         }
1695 
1696         if (gpio_is_valid(rstn)) {
1697                 rc = devm_gpio_request_one(&spi->dev, rstn,
1698                                            GPIOF_OUT_INIT_HIGH, "rstn");
1699                 if (rc)
1700                         return rc;
1701         }
1702 
1703         if (gpio_is_valid(slp_tr)) {
1704                 rc = devm_gpio_request_one(&spi->dev, slp_tr,
1705                                            GPIOF_OUT_INIT_LOW, "slp_tr");
1706                 if (rc)
1707                         return rc;
1708         }
1709 
1710         /* Reset */
1711         if (gpio_is_valid(rstn)) {
1712                 udelay(1);
1713                 gpio_set_value(rstn, 0);
1714                 udelay(1);
1715                 gpio_set_value(rstn, 1);
1716                 usleep_range(120, 240);
1717         }
1718 
1719         hw = ieee802154_alloc_hw(sizeof(*lp), &at86rf230_ops);
1720         if (!hw)
1721                 return -ENOMEM;
1722 
1723         lp = hw->priv;
1724         lp->hw = hw;
1725         lp->spi = spi;
1726         lp->slp_tr = slp_tr;
1727         hw->parent = &spi->dev;
1728         ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
1729 
1730         lp->regmap = devm_regmap_init_spi(spi, &at86rf230_regmap_spi_config);
1731         if (IS_ERR(lp->regmap)) {
1732                 rc = PTR_ERR(lp->regmap);
1733                 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
1734                         rc);
1735                 goto free_dev;
1736         }
1737 
1738         at86rf230_setup_spi_messages(lp, &lp->state);
1739         at86rf230_setup_spi_messages(lp, &lp->tx);
1740 
1741         rc = at86rf230_detect_device(lp);
1742         if (rc < 0)
1743                 goto free_dev;
1744 
1745         init_completion(&lp->state_complete);
1746 
1747         spi_set_drvdata(spi, lp);
1748 
1749         rc = at86rf230_hw_init(lp, xtal_trim);
1750         if (rc)
1751                 goto free_dev;
1752 
1753         /* Read irq status register to reset irq line */
1754         rc = at86rf230_read_subreg(lp, RG_IRQ_STATUS, 0xff, 0, &status);
1755         if (rc)
1756                 goto free_dev;
1757 
1758         irq_type = irq_get_trigger_type(spi->irq);
1759         if (!irq_type)
1760                 irq_type = IRQF_TRIGGER_HIGH;
1761 
1762         rc = devm_request_irq(&spi->dev, spi->irq, at86rf230_isr,
1763                               IRQF_SHARED | irq_type, dev_name(&spi->dev), lp);
1764         if (rc)
1765                 goto free_dev;
1766 
1767         /* disable_irq by default and wait for starting hardware */
1768         disable_irq(spi->irq);
1769 
1770         /* going into sleep by default */
1771         at86rf230_sleep(lp);
1772 
1773         rc = at86rf230_debugfs_init(lp);
1774         if (rc)
1775                 goto free_dev;
1776 
1777         rc = ieee802154_register_hw(lp->hw);
1778         if (rc)
1779                 goto free_debugfs;
1780 
1781         return rc;
1782 
1783 free_debugfs:
1784         at86rf230_debugfs_remove();
1785 free_dev:
1786         ieee802154_free_hw(lp->hw);
1787 
1788         return rc;
1789 }
1790 
1791 static int at86rf230_remove(struct spi_device *spi)
1792 {
1793         struct at86rf230_local *lp = spi_get_drvdata(spi);
1794 
1795         /* mask all at86rf230 irq's */
1796         at86rf230_write_subreg(lp, SR_IRQ_MASK, 0);
1797         ieee802154_unregister_hw(lp->hw);
1798         ieee802154_free_hw(lp->hw);
1799         at86rf230_debugfs_remove();
1800         dev_dbg(&spi->dev, "unregistered at86rf230\n");
1801 
1802         return 0;
1803 }
1804 
1805 static const struct of_device_id at86rf230_of_match[] = {
1806         { .compatible = "atmel,at86rf230", },
1807         { .compatible = "atmel,at86rf231", },
1808         { .compatible = "atmel,at86rf233", },
1809         { .compatible = "atmel,at86rf212", },
1810         { },
1811 };
1812 MODULE_DEVICE_TABLE(of, at86rf230_of_match);
1813 
1814 static const struct spi_device_id at86rf230_device_id[] = {
1815         { .name = "at86rf230", },
1816         { .name = "at86rf231", },
1817         { .name = "at86rf233", },
1818         { .name = "at86rf212", },
1819         { },
1820 };
1821 MODULE_DEVICE_TABLE(spi, at86rf230_device_id);
1822 
1823 static struct spi_driver at86rf230_driver = {
1824         .id_table = at86rf230_device_id,
1825         .driver = {
1826                 .of_match_table = of_match_ptr(at86rf230_of_match),
1827                 .name   = "at86rf230",
1828         },
1829         .probe      = at86rf230_probe,
1830         .remove     = at86rf230_remove,
1831 };
1832 
1833 module_spi_driver(at86rf230_driver);
1834 
1835 MODULE_DESCRIPTION("AT86RF230 Transceiver Driver");
1836 MODULE_LICENSE("GPL v2");
1837 

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