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Merge tag 'armsoc-arm64' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[deliverable/linux.git] / 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 = 210,
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 = 380,
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 = 380,
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");
Linux kernel - Deliverables
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