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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * AT86RF230/RF231 driver
4 *
5 * Copyright (C) 2009-2012 Siemens AG
6 *
7 * Written by:
8 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
9 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
10 * Alexander Aring <aar@pengutronix.de>
11 */
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/gpio/consumer.h>
15#include <linux/hrtimer.h>
16#include <linux/jiffies.h>
17#include <linux/interrupt.h>
18#include <linux/irq.h>
19#include <linux/delay.h>
20#include <linux/property.h>
21#include <linux/spi/spi.h>
22#include <linux/regmap.h>
23#include <linux/skbuff.h>
24#include <linux/ieee802154.h>
25
26#include <net/mac802154.h>
27#include <net/cfg802154.h>
28
29#include "at86rf230.h"
30
31struct at86rf230_local;
32/* at86rf2xx chip depend data.
33 * All timings are in us.
34 */
35struct at86rf2xx_chip_data {
36 u16 t_sleep_cycle;
37 u16 t_channel_switch;
38 u16 t_reset_to_off;
39 u16 t_off_to_aack;
40 u16 t_off_to_tx_on;
41 u16 t_off_to_sleep;
42 u16 t_sleep_to_off;
43 u16 t_frame;
44 u16 t_p_ack;
45 int rssi_base_val;
46
47 int (*set_channel)(struct at86rf230_local *, u8, u8);
48 int (*set_txpower)(struct at86rf230_local *, s32);
49};
50
51#define AT86RF2XX_MAX_BUF (127 + 3)
52/* tx retries to access the TX_ON state
53 * if it's above then force change will be started.
54 *
55 * We assume the max_frame_retries (7) value of 802.15.4 here.
56 */
57#define AT86RF2XX_MAX_TX_RETRIES 7
58/* We use the recommended 5 minutes timeout to recalibrate */
59#define AT86RF2XX_CAL_LOOP_TIMEOUT (5 * 60 * HZ)
60
61struct at86rf230_state_change {
62 struct at86rf230_local *lp;
63 int irq;
64
65 struct hrtimer timer;
66 struct spi_message msg;
67 struct spi_transfer trx;
68 u8 buf[AT86RF2XX_MAX_BUF];
69
70 void (*complete)(void *context);
71 u8 from_state;
72 u8 to_state;
73 int trac;
74
75 bool free;
76};
77
78struct at86rf230_local {
79 struct spi_device *spi;
80
81 struct ieee802154_hw *hw;
82 struct at86rf2xx_chip_data *data;
83 struct regmap *regmap;
84 struct gpio_desc *slp_tr;
85 bool sleep;
86
87 struct completion state_complete;
88 struct at86rf230_state_change state;
89
90 unsigned long cal_timeout;
91 bool is_tx;
92 bool is_tx_from_off;
93 bool was_tx;
94 u8 tx_retry;
95 struct sk_buff *tx_skb;
96 struct at86rf230_state_change tx;
97};
98
99#define AT86RF2XX_NUMREGS 0x3F
100
101static void
102at86rf230_async_state_change(struct at86rf230_local *lp,
103 struct at86rf230_state_change *ctx,
104 const u8 state, void (*complete)(void *context));
105
106static inline void
107at86rf230_sleep(struct at86rf230_local *lp)
108{
109 if (lp->slp_tr) {
110 gpiod_set_value(lp->slp_tr, 1);
111 usleep_range(lp->data->t_off_to_sleep,
112 lp->data->t_off_to_sleep + 10);
113 lp->sleep = true;
114 }
115}
116
117static inline void
118at86rf230_awake(struct at86rf230_local *lp)
119{
120 if (lp->slp_tr) {
121 gpiod_set_value(lp->slp_tr, 0);
122 usleep_range(lp->data->t_sleep_to_off,
123 lp->data->t_sleep_to_off + 100);
124 lp->sleep = false;
125 }
126}
127
128static inline int
129__at86rf230_write(struct at86rf230_local *lp,
130 unsigned int addr, unsigned int data)
131{
132 bool sleep = lp->sleep;
133 int ret;
134
135 /* awake for register setting if sleep */
136 if (sleep)
137 at86rf230_awake(lp);
138
139 ret = regmap_write(lp->regmap, addr, data);
140
141 /* sleep again if was sleeping */
142 if (sleep)
143 at86rf230_sleep(lp);
144
145 return ret;
146}
147
148static inline int
149__at86rf230_read(struct at86rf230_local *lp,
150 unsigned int addr, unsigned int *data)
151{
152 bool sleep = lp->sleep;
153 int ret;
154
155 /* awake for register setting if sleep */
156 if (sleep)
157 at86rf230_awake(lp);
158
159 ret = regmap_read(lp->regmap, addr, data);
160
161 /* sleep again if was sleeping */
162 if (sleep)
163 at86rf230_sleep(lp);
164
165 return ret;
166}
167
168static inline int
169at86rf230_read_subreg(struct at86rf230_local *lp,
170 unsigned int addr, unsigned int mask,
171 unsigned int shift, unsigned int *data)
172{
173 int rc;
174
175 rc = __at86rf230_read(lp, addr, data);
176 if (!rc)
177 *data = (*data & mask) >> shift;
178
179 return rc;
180}
181
182static inline int
183at86rf230_write_subreg(struct at86rf230_local *lp,
184 unsigned int addr, unsigned int mask,
185 unsigned int shift, unsigned int data)
186{
187 bool sleep = lp->sleep;
188 int ret;
189
190 /* awake for register setting if sleep */
191 if (sleep)
192 at86rf230_awake(lp);
193
194 ret = regmap_update_bits(lp->regmap, addr, mask, data << shift);
195
196 /* sleep again if was sleeping */
197 if (sleep)
198 at86rf230_sleep(lp);
199
200 return ret;
201}
202
203static inline void
204at86rf230_slp_tr_rising_edge(struct at86rf230_local *lp)
205{
206 gpiod_set_value(lp->slp_tr, 1);
207 udelay(1);
208 gpiod_set_value(lp->slp_tr, 0);
209}
210
211static bool
212at86rf230_reg_writeable(struct device *dev, unsigned int reg)
213{
214 switch (reg) {
215 case RG_TRX_STATE:
216 case RG_TRX_CTRL_0:
217 case RG_TRX_CTRL_1:
218 case RG_PHY_TX_PWR:
219 case RG_PHY_ED_LEVEL:
220 case RG_PHY_CC_CCA:
221 case RG_CCA_THRES:
222 case RG_RX_CTRL:
223 case RG_SFD_VALUE:
224 case RG_TRX_CTRL_2:
225 case RG_ANT_DIV:
226 case RG_IRQ_MASK:
227 case RG_VREG_CTRL:
228 case RG_BATMON:
229 case RG_XOSC_CTRL:
230 case RG_RX_SYN:
231 case RG_XAH_CTRL_1:
232 case RG_FTN_CTRL:
233 case RG_PLL_CF:
234 case RG_PLL_DCU:
235 case RG_SHORT_ADDR_0:
236 case RG_SHORT_ADDR_1:
237 case RG_PAN_ID_0:
238 case RG_PAN_ID_1:
239 case RG_IEEE_ADDR_0:
240 case RG_IEEE_ADDR_1:
241 case RG_IEEE_ADDR_2:
242 case RG_IEEE_ADDR_3:
243 case RG_IEEE_ADDR_4:
244 case RG_IEEE_ADDR_5:
245 case RG_IEEE_ADDR_6:
246 case RG_IEEE_ADDR_7:
247 case RG_XAH_CTRL_0:
248 case RG_CSMA_SEED_0:
249 case RG_CSMA_SEED_1:
250 case RG_CSMA_BE:
251 return true;
252 default:
253 return false;
254 }
255}
256
257static bool
258at86rf230_reg_readable(struct device *dev, unsigned int reg)
259{
260 bool rc;
261
262 /* all writeable are also readable */
263 rc = at86rf230_reg_writeable(dev, reg);
264 if (rc)
265 return rc;
266
267 /* readonly regs */
268 switch (reg) {
269 case RG_TRX_STATUS:
270 case RG_PHY_RSSI:
271 case RG_IRQ_STATUS:
272 case RG_PART_NUM:
273 case RG_VERSION_NUM:
274 case RG_MAN_ID_1:
275 case RG_MAN_ID_0:
276 return true;
277 default:
278 return false;
279 }
280}
281
282static bool
283at86rf230_reg_volatile(struct device *dev, unsigned int reg)
284{
285 /* can be changed during runtime */
286 switch (reg) {
287 case RG_TRX_STATUS:
288 case RG_TRX_STATE:
289 case RG_PHY_RSSI:
290 case RG_PHY_ED_LEVEL:
291 case RG_IRQ_STATUS:
292 case RG_VREG_CTRL:
293 case RG_PLL_CF:
294 case RG_PLL_DCU:
295 return true;
296 default:
297 return false;
298 }
299}
300
301static bool
302at86rf230_reg_precious(struct device *dev, unsigned int reg)
303{
304 /* don't clear irq line on read */
305 switch (reg) {
306 case RG_IRQ_STATUS:
307 return true;
308 default:
309 return false;
310 }
311}
312
313static const struct regmap_config at86rf230_regmap_spi_config = {
314 .reg_bits = 8,
315 .val_bits = 8,
316 .write_flag_mask = CMD_REG | CMD_WRITE,
317 .read_flag_mask = CMD_REG,
318 .cache_type = REGCACHE_MAPLE,
319 .max_register = AT86RF2XX_NUMREGS,
320 .writeable_reg = at86rf230_reg_writeable,
321 .readable_reg = at86rf230_reg_readable,
322 .volatile_reg = at86rf230_reg_volatile,
323 .precious_reg = at86rf230_reg_precious,
324};
325
326static void
327at86rf230_async_error_recover_complete(void *context)
328{
329 struct at86rf230_state_change *ctx = context;
330 struct at86rf230_local *lp = ctx->lp;
331
332 if (ctx->free)
333 kfree(ctx);
334
335 if (lp->was_tx) {
336 lp->was_tx = 0;
337 ieee802154_xmit_hw_error(lp->hw, lp->tx_skb);
338 }
339}
340
341static void
342at86rf230_async_error_recover(void *context)
343{
344 struct at86rf230_state_change *ctx = context;
345 struct at86rf230_local *lp = ctx->lp;
346
347 if (lp->is_tx) {
348 lp->was_tx = 1;
349 lp->is_tx = 0;
350 }
351
352 at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON,
353 at86rf230_async_error_recover_complete);
354}
355
356static inline void
357at86rf230_async_error(struct at86rf230_local *lp,
358 struct at86rf230_state_change *ctx, int rc)
359{
360 dev_err(&lp->spi->dev, "spi_async error %d\n", rc);
361
362 at86rf230_async_state_change(lp, ctx, STATE_FORCE_TRX_OFF,
363 at86rf230_async_error_recover);
364}
365
366/* Generic function to get some register value in async mode */
367static void
368at86rf230_async_read_reg(struct at86rf230_local *lp, u8 reg,
369 struct at86rf230_state_change *ctx,
370 void (*complete)(void *context))
371{
372 int rc;
373
374 u8 *tx_buf = ctx->buf;
375
376 tx_buf[0] = (reg & CMD_REG_MASK) | CMD_REG;
377 ctx->msg.complete = complete;
378 rc = spi_async(lp->spi, &ctx->msg);
379 if (rc)
380 at86rf230_async_error(lp, ctx, rc);
381}
382
383static void
384at86rf230_async_write_reg(struct at86rf230_local *lp, u8 reg, u8 val,
385 struct at86rf230_state_change *ctx,
386 void (*complete)(void *context))
387{
388 int rc;
389
390 ctx->buf[0] = (reg & CMD_REG_MASK) | CMD_REG | CMD_WRITE;
391 ctx->buf[1] = val;
392 ctx->msg.complete = complete;
393 rc = spi_async(lp->spi, &ctx->msg);
394 if (rc)
395 at86rf230_async_error(lp, ctx, rc);
396}
397
398static void
399at86rf230_async_state_assert(void *context)
400{
401 struct at86rf230_state_change *ctx = context;
402 struct at86rf230_local *lp = ctx->lp;
403 const u8 *buf = ctx->buf;
404 const u8 trx_state = buf[1] & TRX_STATE_MASK;
405
406 /* Assert state change */
407 if (trx_state != ctx->to_state) {
408 /* Special handling if transceiver state is in
409 * STATE_BUSY_RX_AACK and a SHR was detected.
410 */
411 if (trx_state == STATE_BUSY_RX_AACK) {
412 /* Undocumented race condition. If we send a state
413 * change to STATE_RX_AACK_ON the transceiver could
414 * change his state automatically to STATE_BUSY_RX_AACK
415 * if a SHR was detected. This is not an error, but we
416 * can't assert this.
417 */
418 if (ctx->to_state == STATE_RX_AACK_ON)
419 goto done;
420
421 /* If we change to STATE_TX_ON without forcing and
422 * transceiver state is STATE_BUSY_RX_AACK, we wait
423 * 'tFrame + tPAck' receiving time. In this time the
424 * PDU should be received. If the transceiver is still
425 * in STATE_BUSY_RX_AACK, we run a force state change
426 * to STATE_TX_ON. This is a timeout handling, if the
427 * transceiver stucks in STATE_BUSY_RX_AACK.
428 *
429 * Additional we do several retries to try to get into
430 * TX_ON state without forcing. If the retries are
431 * higher or equal than AT86RF2XX_MAX_TX_RETRIES we
432 * will do a force change.
433 */
434 if (ctx->to_state == STATE_TX_ON ||
435 ctx->to_state == STATE_TRX_OFF) {
436 u8 state = ctx->to_state;
437
438 if (lp->tx_retry >= AT86RF2XX_MAX_TX_RETRIES)
439 state = STATE_FORCE_TRX_OFF;
440 lp->tx_retry++;
441
442 at86rf230_async_state_change(lp, ctx, state,
443 ctx->complete);
444 return;
445 }
446 }
447
448 dev_warn(&lp->spi->dev, "unexcept state change from 0x%02x to 0x%02x. Actual state: 0x%02x\n",
449 ctx->from_state, ctx->to_state, trx_state);
450 }
451
452done:
453 if (ctx->complete)
454 ctx->complete(context);
455}
456
457static enum hrtimer_restart at86rf230_async_state_timer(struct hrtimer *timer)
458{
459 struct at86rf230_state_change *ctx =
460 container_of(timer, struct at86rf230_state_change, timer);
461 struct at86rf230_local *lp = ctx->lp;
462
463 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
464 at86rf230_async_state_assert);
465
466 return HRTIMER_NORESTART;
467}
468
469/* Do state change timing delay. */
470static void
471at86rf230_async_state_delay(void *context)
472{
473 struct at86rf230_state_change *ctx = context;
474 struct at86rf230_local *lp = ctx->lp;
475 struct at86rf2xx_chip_data *c = lp->data;
476 bool force = false;
477 ktime_t tim;
478
479 /* The force state changes are will show as normal states in the
480 * state status subregister. We change the to_state to the
481 * corresponding one and remember if it was a force change, this
482 * differs if we do a state change from STATE_BUSY_RX_AACK.
483 */
484 switch (ctx->to_state) {
485 case STATE_FORCE_TX_ON:
486 ctx->to_state = STATE_TX_ON;
487 force = true;
488 break;
489 case STATE_FORCE_TRX_OFF:
490 ctx->to_state = STATE_TRX_OFF;
491 force = true;
492 break;
493 default:
494 break;
495 }
496
497 switch (ctx->from_state) {
498 case STATE_TRX_OFF:
499 switch (ctx->to_state) {
500 case STATE_RX_AACK_ON:
501 tim = c->t_off_to_aack * NSEC_PER_USEC;
502 /* state change from TRX_OFF to RX_AACK_ON to do a
503 * calibration, we need to reset the timeout for the
504 * next one.
505 */
506 lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
507 goto change;
508 case STATE_TX_ARET_ON:
509 case STATE_TX_ON:
510 tim = c->t_off_to_tx_on * NSEC_PER_USEC;
511 /* state change from TRX_OFF to TX_ON or ARET_ON to do
512 * a calibration, we need to reset the timeout for the
513 * next one.
514 */
515 lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
516 goto change;
517 default:
518 break;
519 }
520 break;
521 case STATE_BUSY_RX_AACK:
522 switch (ctx->to_state) {
523 case STATE_TRX_OFF:
524 case STATE_TX_ON:
525 /* Wait for worst case receiving time if we
526 * didn't make a force change from BUSY_RX_AACK
527 * to TX_ON or TRX_OFF.
528 */
529 if (!force) {
530 tim = (c->t_frame + c->t_p_ack) * NSEC_PER_USEC;
531 goto change;
532 }
533 break;
534 default:
535 break;
536 }
537 break;
538 /* Default value, means RESET state */
539 case STATE_P_ON:
540 switch (ctx->to_state) {
541 case STATE_TRX_OFF:
542 tim = c->t_reset_to_off * NSEC_PER_USEC;
543 goto change;
544 default:
545 break;
546 }
547 break;
548 default:
549 break;
550 }
551
552 /* Default delay is 1us in the most cases */
553 udelay(1);
554 at86rf230_async_state_timer(&ctx->timer);
555 return;
556
557change:
558 hrtimer_start(&ctx->timer, tim, HRTIMER_MODE_REL);
559}
560
561static void
562at86rf230_async_state_change_start(void *context)
563{
564 struct at86rf230_state_change *ctx = context;
565 struct at86rf230_local *lp = ctx->lp;
566 u8 *buf = ctx->buf;
567 const u8 trx_state = buf[1] & TRX_STATE_MASK;
568
569 /* Check for "possible" STATE_TRANSITION_IN_PROGRESS */
570 if (trx_state == STATE_TRANSITION_IN_PROGRESS) {
571 udelay(1);
572 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
573 at86rf230_async_state_change_start);
574 return;
575 }
576
577 /* Check if we already are in the state which we change in */
578 if (trx_state == ctx->to_state) {
579 if (ctx->complete)
580 ctx->complete(context);
581 return;
582 }
583
584 /* Set current state to the context of state change */
585 ctx->from_state = trx_state;
586
587 /* Going into the next step for a state change which do a timing
588 * relevant delay.
589 */
590 at86rf230_async_write_reg(lp, RG_TRX_STATE, ctx->to_state, ctx,
591 at86rf230_async_state_delay);
592}
593
594static void
595at86rf230_async_state_change(struct at86rf230_local *lp,
596 struct at86rf230_state_change *ctx,
597 const u8 state, void (*complete)(void *context))
598{
599 /* Initialization for the state change context */
600 ctx->to_state = state;
601 ctx->complete = complete;
602 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
603 at86rf230_async_state_change_start);
604}
605
606static void
607at86rf230_sync_state_change_complete(void *context)
608{
609 struct at86rf230_state_change *ctx = context;
610 struct at86rf230_local *lp = ctx->lp;
611
612 complete(&lp->state_complete);
613}
614
615/* This function do a sync framework above the async state change.
616 * Some callbacks of the IEEE 802.15.4 driver interface need to be
617 * handled synchronously.
618 */
619static int
620at86rf230_sync_state_change(struct at86rf230_local *lp, unsigned int state)
621{
622 unsigned long rc;
623
624 at86rf230_async_state_change(lp, &lp->state, state,
625 at86rf230_sync_state_change_complete);
626
627 rc = wait_for_completion_timeout(&lp->state_complete,
628 msecs_to_jiffies(100));
629 if (!rc) {
630 at86rf230_async_error(lp, &lp->state, -ETIMEDOUT);
631 return -ETIMEDOUT;
632 }
633
634 return 0;
635}
636
637static void
638at86rf230_tx_complete(void *context)
639{
640 struct at86rf230_state_change *ctx = context;
641 struct at86rf230_local *lp = ctx->lp;
642
643 if (ctx->trac == IEEE802154_SUCCESS)
644 ieee802154_xmit_complete(lp->hw, lp->tx_skb, false);
645 else
646 ieee802154_xmit_error(lp->hw, lp->tx_skb, ctx->trac);
647
648 kfree(ctx);
649}
650
651static void
652at86rf230_tx_on(void *context)
653{
654 struct at86rf230_state_change *ctx = context;
655 struct at86rf230_local *lp = ctx->lp;
656
657 at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON,
658 at86rf230_tx_complete);
659}
660
661static void
662at86rf230_tx_trac_check(void *context)
663{
664 struct at86rf230_state_change *ctx = context;
665 struct at86rf230_local *lp = ctx->lp;
666 u8 trac = TRAC_MASK(ctx->buf[1]);
667
668 switch (trac) {
669 case TRAC_SUCCESS:
670 case TRAC_SUCCESS_DATA_PENDING:
671 ctx->trac = IEEE802154_SUCCESS;
672 break;
673 case TRAC_CHANNEL_ACCESS_FAILURE:
674 ctx->trac = IEEE802154_CHANNEL_ACCESS_FAILURE;
675 break;
676 case TRAC_NO_ACK:
677 ctx->trac = IEEE802154_NO_ACK;
678 break;
679 default:
680 ctx->trac = IEEE802154_SYSTEM_ERROR;
681 }
682
683 at86rf230_async_state_change(lp, ctx, STATE_TX_ON, at86rf230_tx_on);
684}
685
686static void
687at86rf230_rx_read_frame_complete(void *context)
688{
689 struct at86rf230_state_change *ctx = context;
690 struct at86rf230_local *lp = ctx->lp;
691 const u8 *buf = ctx->buf;
692 struct sk_buff *skb;
693 u8 len, lqi;
694
695 len = buf[1];
696 if (!ieee802154_is_valid_psdu_len(len)) {
697 dev_vdbg(&lp->spi->dev, "corrupted frame received\n");
698 len = IEEE802154_MTU;
699 }
700 lqi = buf[2 + len];
701
702 skb = dev_alloc_skb(IEEE802154_MTU);
703 if (!skb) {
704 dev_vdbg(&lp->spi->dev, "failed to allocate sk_buff\n");
705 kfree(ctx);
706 return;
707 }
708
709 skb_put_data(skb, buf + 2, len);
710 ieee802154_rx_irqsafe(lp->hw, skb, lqi);
711 kfree(ctx);
712}
713
714static void
715at86rf230_rx_trac_check(void *context)
716{
717 struct at86rf230_state_change *ctx = context;
718 struct at86rf230_local *lp = ctx->lp;
719 u8 *buf = ctx->buf;
720 int rc;
721
722 buf[0] = CMD_FB;
723 ctx->trx.len = AT86RF2XX_MAX_BUF;
724 ctx->msg.complete = at86rf230_rx_read_frame_complete;
725 rc = spi_async(lp->spi, &ctx->msg);
726 if (rc) {
727 ctx->trx.len = 2;
728 at86rf230_async_error(lp, ctx, rc);
729 }
730}
731
732static void
733at86rf230_irq_trx_end(void *context)
734{
735 struct at86rf230_state_change *ctx = context;
736 struct at86rf230_local *lp = ctx->lp;
737
738 if (lp->is_tx) {
739 lp->is_tx = 0;
740 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx,
741 at86rf230_tx_trac_check);
742 } else {
743 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx,
744 at86rf230_rx_trac_check);
745 }
746}
747
748static void
749at86rf230_irq_status(void *context)
750{
751 struct at86rf230_state_change *ctx = context;
752 struct at86rf230_local *lp = ctx->lp;
753 const u8 *buf = ctx->buf;
754 u8 irq = buf[1];
755
756 enable_irq(lp->spi->irq);
757
758 if (irq & IRQ_TRX_END) {
759 at86rf230_irq_trx_end(ctx);
760 } else {
761 dev_err(&lp->spi->dev, "not supported irq %02x received\n",
762 irq);
763 kfree(ctx);
764 }
765}
766
767static void
768at86rf230_setup_spi_messages(struct at86rf230_local *lp,
769 struct at86rf230_state_change *state)
770{
771 state->lp = lp;
772 state->irq = lp->spi->irq;
773 spi_message_init(&state->msg);
774 state->msg.context = state;
775 state->trx.len = 2;
776 state->trx.tx_buf = state->buf;
777 state->trx.rx_buf = state->buf;
778 spi_message_add_tail(&state->trx, &state->msg);
779 hrtimer_init(&state->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
780 state->timer.function = at86rf230_async_state_timer;
781}
782
783static irqreturn_t at86rf230_isr(int irq, void *data)
784{
785 struct at86rf230_local *lp = data;
786 struct at86rf230_state_change *ctx;
787 int rc;
788
789 disable_irq_nosync(irq);
790
791 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
792 if (!ctx) {
793 enable_irq(irq);
794 return IRQ_NONE;
795 }
796
797 at86rf230_setup_spi_messages(lp, ctx);
798 /* tell on error handling to free ctx */
799 ctx->free = true;
800
801 ctx->buf[0] = (RG_IRQ_STATUS & CMD_REG_MASK) | CMD_REG;
802 ctx->msg.complete = at86rf230_irq_status;
803 rc = spi_async(lp->spi, &ctx->msg);
804 if (rc) {
805 at86rf230_async_error(lp, ctx, rc);
806 enable_irq(irq);
807 return IRQ_NONE;
808 }
809
810 return IRQ_HANDLED;
811}
812
813static void
814at86rf230_write_frame_complete(void *context)
815{
816 struct at86rf230_state_change *ctx = context;
817 struct at86rf230_local *lp = ctx->lp;
818
819 ctx->trx.len = 2;
820
821 if (lp->slp_tr)
822 at86rf230_slp_tr_rising_edge(lp);
823 else
824 at86rf230_async_write_reg(lp, RG_TRX_STATE, STATE_BUSY_TX, ctx,
825 NULL);
826}
827
828static void
829at86rf230_write_frame(void *context)
830{
831 struct at86rf230_state_change *ctx = context;
832 struct at86rf230_local *lp = ctx->lp;
833 struct sk_buff *skb = lp->tx_skb;
834 u8 *buf = ctx->buf;
835 int rc;
836
837 lp->is_tx = 1;
838
839 buf[0] = CMD_FB | CMD_WRITE;
840 buf[1] = skb->len + 2;
841 memcpy(buf + 2, skb->data, skb->len);
842 ctx->trx.len = skb->len + 2;
843 ctx->msg.complete = at86rf230_write_frame_complete;
844 rc = spi_async(lp->spi, &ctx->msg);
845 if (rc) {
846 ctx->trx.len = 2;
847 at86rf230_async_error(lp, ctx, rc);
848 }
849}
850
851static void
852at86rf230_xmit_tx_on(void *context)
853{
854 struct at86rf230_state_change *ctx = context;
855 struct at86rf230_local *lp = ctx->lp;
856
857 at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
858 at86rf230_write_frame);
859}
860
861static void
862at86rf230_xmit_start(void *context)
863{
864 struct at86rf230_state_change *ctx = context;
865 struct at86rf230_local *lp = ctx->lp;
866
867 /* check if we change from off state */
868 if (lp->is_tx_from_off)
869 at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
870 at86rf230_write_frame);
871 else
872 at86rf230_async_state_change(lp, ctx, STATE_TX_ON,
873 at86rf230_xmit_tx_on);
874}
875
876static int
877at86rf230_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
878{
879 struct at86rf230_local *lp = hw->priv;
880 struct at86rf230_state_change *ctx = &lp->tx;
881
882 lp->tx_skb = skb;
883 lp->tx_retry = 0;
884
885 /* After 5 minutes in PLL and the same frequency we run again the
886 * calibration loops which is recommended by at86rf2xx datasheets.
887 *
888 * The calibration is initiate by a state change from TRX_OFF
889 * to TX_ON, the lp->cal_timeout should be reinit by state_delay
890 * function then to start in the next 5 minutes.
891 */
892 if (time_is_before_jiffies(lp->cal_timeout)) {
893 lp->is_tx_from_off = true;
894 at86rf230_async_state_change(lp, ctx, STATE_TRX_OFF,
895 at86rf230_xmit_start);
896 } else {
897 lp->is_tx_from_off = false;
898 at86rf230_xmit_start(ctx);
899 }
900
901 return 0;
902}
903
904static int
905at86rf230_ed(struct ieee802154_hw *hw, u8 *level)
906{
907 WARN_ON(!level);
908 *level = 0xbe;
909 return 0;
910}
911
912static int
913at86rf230_start(struct ieee802154_hw *hw)
914{
915 struct at86rf230_local *lp = hw->priv;
916
917 at86rf230_awake(lp);
918 enable_irq(lp->spi->irq);
919
920 return at86rf230_sync_state_change(lp, STATE_RX_AACK_ON);
921}
922
923static void
924at86rf230_stop(struct ieee802154_hw *hw)
925{
926 struct at86rf230_local *lp = hw->priv;
927 u8 csma_seed[2];
928
929 at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
930
931 disable_irq(lp->spi->irq);
932
933 /* It's recommended to set random new csma_seeds before sleep state.
934 * Makes only sense in the stop callback, not doing this inside of
935 * at86rf230_sleep, this is also used when we don't transmit afterwards
936 * when calling start callback again.
937 */
938 get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
939 at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
940 at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
941
942 at86rf230_sleep(lp);
943}
944
945static int
946at86rf23x_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
947{
948 return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
949}
950
951#define AT86RF2XX_MAX_ED_LEVELS 0xF
952static const s32 at86rf233_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = {
953 -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000, -7800, -7600,
954 -7400, -7200, -7000, -6800, -6600, -6400,
955};
956
957static const s32 at86rf231_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = {
958 -9100, -8900, -8700, -8500, -8300, -8100, -7900, -7700, -7500, -7300,
959 -7100, -6900, -6700, -6500, -6300, -6100,
960};
961
962static const s32 at86rf212_ed_levels_100[AT86RF2XX_MAX_ED_LEVELS + 1] = {
963 -10000, -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200,
964 -8000, -7800, -7600, -7400, -7200, -7000,
965};
966
967static const s32 at86rf212_ed_levels_98[AT86RF2XX_MAX_ED_LEVELS + 1] = {
968 -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000,
969 -7800, -7600, -7400, -7200, -7000, -6800,
970};
971
972static inline int
973at86rf212_update_cca_ed_level(struct at86rf230_local *lp, int rssi_base_val)
974{
975 unsigned int cca_ed_thres;
976 int rc;
977
978 rc = at86rf230_read_subreg(lp, SR_CCA_ED_THRES, &cca_ed_thres);
979 if (rc < 0)
980 return rc;
981
982 switch (rssi_base_val) {
983 case -98:
984 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_98;
985 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_98);
986 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_98[cca_ed_thres];
987 break;
988 case -100:
989 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
990 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
991 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_100[cca_ed_thres];
992 break;
993 default:
994 WARN_ON(1);
995 }
996
997 return 0;
998}
999
1000static int
1001at86rf212_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
1002{
1003 int rc;
1004
1005 if (channel == 0)
1006 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 0);
1007 else
1008 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 1);
1009 if (rc < 0)
1010 return rc;
1011
1012 if (page == 0) {
1013 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 0);
1014 lp->data->rssi_base_val = -100;
1015 } else {
1016 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 1);
1017 lp->data->rssi_base_val = -98;
1018 }
1019 if (rc < 0)
1020 return rc;
1021
1022 rc = at86rf212_update_cca_ed_level(lp, lp->data->rssi_base_val);
1023 if (rc < 0)
1024 return rc;
1025
1026 return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
1027}
1028
1029static int
1030at86rf230_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
1031{
1032 struct at86rf230_local *lp = hw->priv;
1033 int rc;
1034
1035 rc = lp->data->set_channel(lp, page, channel);
1036 /* Wait for PLL */
1037 usleep_range(lp->data->t_channel_switch,
1038 lp->data->t_channel_switch + 10);
1039
1040 lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
1041 return rc;
1042}
1043
1044static int
1045at86rf230_set_hw_addr_filt(struct ieee802154_hw *hw,
1046 struct ieee802154_hw_addr_filt *filt,
1047 unsigned long changed)
1048{
1049 struct at86rf230_local *lp = hw->priv;
1050
1051 if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
1052 u16 addr = le16_to_cpu(filt->short_addr);
1053
1054 dev_vdbg(&lp->spi->dev, "%s called for saddr\n", __func__);
1055 __at86rf230_write(lp, RG_SHORT_ADDR_0, addr);
1056 __at86rf230_write(lp, RG_SHORT_ADDR_1, addr >> 8);
1057 }
1058
1059 if (changed & IEEE802154_AFILT_PANID_CHANGED) {
1060 u16 pan = le16_to_cpu(filt->pan_id);
1061
1062 dev_vdbg(&lp->spi->dev, "%s called for pan id\n", __func__);
1063 __at86rf230_write(lp, RG_PAN_ID_0, pan);
1064 __at86rf230_write(lp, RG_PAN_ID_1, pan >> 8);
1065 }
1066
1067 if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
1068 u8 i, addr[8];
1069
1070 memcpy(addr, &filt->ieee_addr, 8);
1071 dev_vdbg(&lp->spi->dev, "%s called for IEEE addr\n", __func__);
1072 for (i = 0; i < 8; i++)
1073 __at86rf230_write(lp, RG_IEEE_ADDR_0 + i, addr[i]);
1074 }
1075
1076 if (changed & IEEE802154_AFILT_PANC_CHANGED) {
1077 dev_vdbg(&lp->spi->dev, "%s called for panc change\n", __func__);
1078 if (filt->pan_coord)
1079 at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 1);
1080 else
1081 at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 0);
1082 }
1083
1084 return 0;
1085}
1086
1087#define AT86RF23X_MAX_TX_POWERS 0xF
1088static const s32 at86rf233_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1089 400, 370, 340, 300, 250, 200, 100, 0, -100, -200, -300, -400, -600,
1090 -800, -1200, -1700,
1091};
1092
1093static const s32 at86rf231_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1094 300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700,
1095 -900, -1200, -1700,
1096};
1097
1098#define AT86RF212_MAX_TX_POWERS 0x1F
1099static const s32 at86rf212_powers[AT86RF212_MAX_TX_POWERS + 1] = {
1100 500, 400, 300, 200, 100, 0, -100, -200, -300, -400, -500, -600, -700,
1101 -800, -900, -1000, -1100, -1200, -1300, -1400, -1500, -1600, -1700,
1102 -1800, -1900, -2000, -2100, -2200, -2300, -2400, -2500, -2600,
1103};
1104
1105static int
1106at86rf23x_set_txpower(struct at86rf230_local *lp, s32 mbm)
1107{
1108 u32 i;
1109
1110 for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1111 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1112 return at86rf230_write_subreg(lp, SR_TX_PWR_23X, i);
1113 }
1114
1115 return -EINVAL;
1116}
1117
1118static int
1119at86rf212_set_txpower(struct at86rf230_local *lp, s32 mbm)
1120{
1121 u32 i;
1122
1123 for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1124 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1125 return at86rf230_write_subreg(lp, SR_TX_PWR_212, i);
1126 }
1127
1128 return -EINVAL;
1129}
1130
1131static int
1132at86rf230_set_txpower(struct ieee802154_hw *hw, s32 mbm)
1133{
1134 struct at86rf230_local *lp = hw->priv;
1135
1136 return lp->data->set_txpower(lp, mbm);
1137}
1138
1139static int
1140at86rf230_set_lbt(struct ieee802154_hw *hw, bool on)
1141{
1142 struct at86rf230_local *lp = hw->priv;
1143
1144 return at86rf230_write_subreg(lp, SR_CSMA_LBT_MODE, on);
1145}
1146
1147static int
1148at86rf230_set_cca_mode(struct ieee802154_hw *hw,
1149 const struct wpan_phy_cca *cca)
1150{
1151 struct at86rf230_local *lp = hw->priv;
1152 u8 val;
1153
1154 /* mapping 802.15.4 to driver spec */
1155 switch (cca->mode) {
1156 case NL802154_CCA_ENERGY:
1157 val = 1;
1158 break;
1159 case NL802154_CCA_CARRIER:
1160 val = 2;
1161 break;
1162 case NL802154_CCA_ENERGY_CARRIER:
1163 switch (cca->opt) {
1164 case NL802154_CCA_OPT_ENERGY_CARRIER_AND:
1165 val = 3;
1166 break;
1167 case NL802154_CCA_OPT_ENERGY_CARRIER_OR:
1168 val = 0;
1169 break;
1170 default:
1171 return -EINVAL;
1172 }
1173 break;
1174 default:
1175 return -EINVAL;
1176 }
1177
1178 return at86rf230_write_subreg(lp, SR_CCA_MODE, val);
1179}
1180
1181static int
1182at86rf230_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
1183{
1184 struct at86rf230_local *lp = hw->priv;
1185 u32 i;
1186
1187 for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) {
1188 if (hw->phy->supported.cca_ed_levels[i] == mbm)
1189 return at86rf230_write_subreg(lp, SR_CCA_ED_THRES, i);
1190 }
1191
1192 return -EINVAL;
1193}
1194
1195static int
1196at86rf230_set_csma_params(struct ieee802154_hw *hw, u8 min_be, u8 max_be,
1197 u8 retries)
1198{
1199 struct at86rf230_local *lp = hw->priv;
1200 int rc;
1201
1202 rc = at86rf230_write_subreg(lp, SR_MIN_BE, min_be);
1203 if (rc)
1204 return rc;
1205
1206 rc = at86rf230_write_subreg(lp, SR_MAX_BE, max_be);
1207 if (rc)
1208 return rc;
1209
1210 return at86rf230_write_subreg(lp, SR_MAX_CSMA_RETRIES, retries);
1211}
1212
1213static int
1214at86rf230_set_frame_retries(struct ieee802154_hw *hw, s8 retries)
1215{
1216 struct at86rf230_local *lp = hw->priv;
1217
1218 return at86rf230_write_subreg(lp, SR_MAX_FRAME_RETRIES, retries);
1219}
1220
1221static int
1222at86rf230_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
1223{
1224 struct at86rf230_local *lp = hw->priv;
1225 int rc;
1226
1227 if (on) {
1228 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 1);
1229 if (rc < 0)
1230 return rc;
1231
1232 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 1);
1233 if (rc < 0)
1234 return rc;
1235 } else {
1236 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 0);
1237 if (rc < 0)
1238 return rc;
1239
1240 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 0);
1241 if (rc < 0)
1242 return rc;
1243 }
1244
1245 return 0;
1246}
1247
1248static const struct ieee802154_ops at86rf230_ops = {
1249 .owner = THIS_MODULE,
1250 .xmit_async = at86rf230_xmit,
1251 .ed = at86rf230_ed,
1252 .set_channel = at86rf230_channel,
1253 .start = at86rf230_start,
1254 .stop = at86rf230_stop,
1255 .set_hw_addr_filt = at86rf230_set_hw_addr_filt,
1256 .set_txpower = at86rf230_set_txpower,
1257 .set_lbt = at86rf230_set_lbt,
1258 .set_cca_mode = at86rf230_set_cca_mode,
1259 .set_cca_ed_level = at86rf230_set_cca_ed_level,
1260 .set_csma_params = at86rf230_set_csma_params,
1261 .set_frame_retries = at86rf230_set_frame_retries,
1262 .set_promiscuous_mode = at86rf230_set_promiscuous_mode,
1263};
1264
1265static struct at86rf2xx_chip_data at86rf233_data = {
1266 .t_sleep_cycle = 330,
1267 .t_channel_switch = 11,
1268 .t_reset_to_off = 26,
1269 .t_off_to_aack = 80,
1270 .t_off_to_tx_on = 80,
1271 .t_off_to_sleep = 35,
1272 .t_sleep_to_off = 1000,
1273 .t_frame = 4096,
1274 .t_p_ack = 545,
1275 .rssi_base_val = -94,
1276 .set_channel = at86rf23x_set_channel,
1277 .set_txpower = at86rf23x_set_txpower,
1278};
1279
1280static struct at86rf2xx_chip_data at86rf231_data = {
1281 .t_sleep_cycle = 330,
1282 .t_channel_switch = 24,
1283 .t_reset_to_off = 37,
1284 .t_off_to_aack = 110,
1285 .t_off_to_tx_on = 110,
1286 .t_off_to_sleep = 35,
1287 .t_sleep_to_off = 1000,
1288 .t_frame = 4096,
1289 .t_p_ack = 545,
1290 .rssi_base_val = -91,
1291 .set_channel = at86rf23x_set_channel,
1292 .set_txpower = at86rf23x_set_txpower,
1293};
1294
1295static struct at86rf2xx_chip_data at86rf212_data = {
1296 .t_sleep_cycle = 330,
1297 .t_channel_switch = 11,
1298 .t_reset_to_off = 26,
1299 .t_off_to_aack = 200,
1300 .t_off_to_tx_on = 200,
1301 .t_off_to_sleep = 35,
1302 .t_sleep_to_off = 1000,
1303 .t_frame = 4096,
1304 .t_p_ack = 545,
1305 .rssi_base_val = -100,
1306 .set_channel = at86rf212_set_channel,
1307 .set_txpower = at86rf212_set_txpower,
1308};
1309
1310static int at86rf230_hw_init(struct at86rf230_local *lp, u8 xtal_trim)
1311{
1312 int rc, irq_type, irq_pol = IRQ_ACTIVE_HIGH;
1313 unsigned int dvdd;
1314 u8 csma_seed[2];
1315
1316 rc = at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
1317 if (rc)
1318 return rc;
1319
1320 irq_type = irq_get_trigger_type(lp->spi->irq);
1321 if (irq_type == IRQ_TYPE_EDGE_FALLING ||
1322 irq_type == IRQ_TYPE_LEVEL_LOW)
1323 irq_pol = IRQ_ACTIVE_LOW;
1324
1325 rc = at86rf230_write_subreg(lp, SR_IRQ_POLARITY, irq_pol);
1326 if (rc)
1327 return rc;
1328
1329 rc = at86rf230_write_subreg(lp, SR_RX_SAFE_MODE, 1);
1330 if (rc)
1331 return rc;
1332
1333 rc = at86rf230_write_subreg(lp, SR_IRQ_MASK, IRQ_TRX_END);
1334 if (rc)
1335 return rc;
1336
1337 /* reset values differs in at86rf231 and at86rf233 */
1338 rc = at86rf230_write_subreg(lp, SR_IRQ_MASK_MODE, 0);
1339 if (rc)
1340 return rc;
1341
1342 get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
1343 rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
1344 if (rc)
1345 return rc;
1346 rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
1347 if (rc)
1348 return rc;
1349
1350 /* CLKM changes are applied immediately */
1351 rc = at86rf230_write_subreg(lp, SR_CLKM_SHA_SEL, 0x00);
1352 if (rc)
1353 return rc;
1354
1355 /* Turn CLKM Off */
1356 rc = at86rf230_write_subreg(lp, SR_CLKM_CTRL, 0x00);
1357 if (rc)
1358 return rc;
1359 /* Wait the next SLEEP cycle */
1360 usleep_range(lp->data->t_sleep_cycle,
1361 lp->data->t_sleep_cycle + 100);
1362
1363 /* xtal_trim value is calculated by:
1364 * CL = 0.5 * (CX + CTRIM + CPAR)
1365 *
1366 * whereas:
1367 * CL = capacitor of used crystal
1368 * CX = connected capacitors at xtal pins
1369 * CPAR = in all at86rf2xx datasheets this is a constant value 3 pF,
1370 * but this is different on each board setup. You need to fine
1371 * tuning this value via CTRIM.
1372 * CTRIM = variable capacitor setting. Resolution is 0.3 pF range is
1373 * 0 pF upto 4.5 pF.
1374 *
1375 * Examples:
1376 * atben transceiver:
1377 *
1378 * CL = 8 pF
1379 * CX = 12 pF
1380 * CPAR = 3 pF (We assume the magic constant from datasheet)
1381 * CTRIM = 0.9 pF
1382 *
1383 * (12+0.9+3)/2 = 7.95 which is nearly at 8 pF
1384 *
1385 * xtal_trim = 0x3
1386 *
1387 * openlabs transceiver:
1388 *
1389 * CL = 16 pF
1390 * CX = 22 pF
1391 * CPAR = 3 pF (We assume the magic constant from datasheet)
1392 * CTRIM = 4.5 pF
1393 *
1394 * (22+4.5+3)/2 = 14.75 which is the nearest value to 16 pF
1395 *
1396 * xtal_trim = 0xf
1397 */
1398 rc = at86rf230_write_subreg(lp, SR_XTAL_TRIM, xtal_trim);
1399 if (rc)
1400 return rc;
1401
1402 rc = at86rf230_read_subreg(lp, SR_DVDD_OK, &dvdd);
1403 if (rc)
1404 return rc;
1405 if (!dvdd) {
1406 dev_err(&lp->spi->dev, "DVDD error\n");
1407 return -EINVAL;
1408 }
1409
1410 /* Force setting slotted operation bit to 0. Sometimes the atben
1411 * sets this bit and I don't know why. We set this always force
1412 * to zero while probing.
1413 */
1414 return at86rf230_write_subreg(lp, SR_SLOTTED_OPERATION, 0);
1415}
1416
1417static int
1418at86rf230_detect_device(struct at86rf230_local *lp)
1419{
1420 unsigned int part, version, val;
1421 u16 man_id = 0;
1422 const char *chip;
1423 int rc;
1424
1425 rc = __at86rf230_read(lp, RG_MAN_ID_0, &val);
1426 if (rc)
1427 return rc;
1428 man_id |= val;
1429
1430 rc = __at86rf230_read(lp, RG_MAN_ID_1, &val);
1431 if (rc)
1432 return rc;
1433 man_id |= (val << 8);
1434
1435 rc = __at86rf230_read(lp, RG_PART_NUM, &part);
1436 if (rc)
1437 return rc;
1438
1439 rc = __at86rf230_read(lp, RG_VERSION_NUM, &version);
1440 if (rc)
1441 return rc;
1442
1443 if (man_id != 0x001f) {
1444 dev_err(&lp->spi->dev, "Non-Atmel dev found (MAN_ID %02x %02x)\n",
1445 man_id >> 8, man_id & 0xFF);
1446 return -EINVAL;
1447 }
1448
1449 lp->hw->flags = IEEE802154_HW_TX_OMIT_CKSUM |
1450 IEEE802154_HW_CSMA_PARAMS |
1451 IEEE802154_HW_FRAME_RETRIES | IEEE802154_HW_AFILT |
1452 IEEE802154_HW_PROMISCUOUS;
1453
1454 lp->hw->phy->flags = WPAN_PHY_FLAG_TXPOWER |
1455 WPAN_PHY_FLAG_CCA_ED_LEVEL |
1456 WPAN_PHY_FLAG_CCA_MODE;
1457
1458 lp->hw->phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY) |
1459 BIT(NL802154_CCA_CARRIER) | BIT(NL802154_CCA_ENERGY_CARRIER);
1460 lp->hw->phy->supported.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND) |
1461 BIT(NL802154_CCA_OPT_ENERGY_CARRIER_OR);
1462
1463 lp->hw->phy->cca.mode = NL802154_CCA_ENERGY;
1464
1465 switch (part) {
1466 case 2:
1467 chip = "at86rf230";
1468 rc = -ENOTSUPP;
1469 goto not_supp;
1470 case 3:
1471 chip = "at86rf231";
1472 lp->data = &at86rf231_data;
1473 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1474 lp->hw->phy->current_channel = 11;
1475 lp->hw->phy->supported.tx_powers = at86rf231_powers;
1476 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf231_powers);
1477 lp->hw->phy->supported.cca_ed_levels = at86rf231_ed_levels;
1478 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf231_ed_levels);
1479 break;
1480 case 7:
1481 chip = "at86rf212";
1482 lp->data = &at86rf212_data;
1483 lp->hw->flags |= IEEE802154_HW_LBT;
1484 lp->hw->phy->supported.channels[0] = 0x00007FF;
1485 lp->hw->phy->supported.channels[2] = 0x00007FF;
1486 lp->hw->phy->current_channel = 5;
1487 lp->hw->phy->supported.lbt = NL802154_SUPPORTED_BOOL_BOTH;
1488 lp->hw->phy->supported.tx_powers = at86rf212_powers;
1489 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf212_powers);
1490 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
1491 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
1492 break;
1493 case 11:
1494 chip = "at86rf233";
1495 lp->data = &at86rf233_data;
1496 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1497 lp->hw->phy->current_channel = 13;
1498 lp->hw->phy->supported.tx_powers = at86rf233_powers;
1499 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf233_powers);
1500 lp->hw->phy->supported.cca_ed_levels = at86rf233_ed_levels;
1501 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf233_ed_levels);
1502 break;
1503 default:
1504 chip = "unknown";
1505 rc = -ENOTSUPP;
1506 goto not_supp;
1507 }
1508
1509 lp->hw->phy->cca_ed_level = lp->hw->phy->supported.cca_ed_levels[7];
1510 lp->hw->phy->transmit_power = lp->hw->phy->supported.tx_powers[0];
1511
1512not_supp:
1513 dev_info(&lp->spi->dev, "Detected %s chip version %d\n", chip, version);
1514
1515 return rc;
1516}
1517
1518static int at86rf230_probe(struct spi_device *spi)
1519{
1520 struct ieee802154_hw *hw;
1521 struct at86rf230_local *lp;
1522 struct gpio_desc *slp_tr;
1523 struct gpio_desc *rstn;
1524 unsigned int status;
1525 int rc, irq_type;
1526 u8 xtal_trim;
1527
1528 if (!spi->irq) {
1529 dev_err(&spi->dev, "no IRQ specified\n");
1530 return -EINVAL;
1531 }
1532
1533 rc = device_property_read_u8(&spi->dev, "xtal-trim", &xtal_trim);
1534 if (rc < 0) {
1535 if (rc != -EINVAL) {
1536 dev_err(&spi->dev,
1537 "failed to parse xtal-trim: %d\n", rc);
1538 return rc;
1539 }
1540 xtal_trim = 0;
1541 }
1542
1543 rstn = devm_gpiod_get_optional(&spi->dev, "reset", GPIOD_OUT_LOW);
1544 rc = PTR_ERR_OR_ZERO(rstn);
1545 if (rc)
1546 return rc;
1547
1548 gpiod_set_consumer_name(rstn, "rstn");
1549
1550 slp_tr = devm_gpiod_get_optional(&spi->dev, "sleep", GPIOD_OUT_LOW);
1551 rc = PTR_ERR_OR_ZERO(slp_tr);
1552 if (rc)
1553 return rc;
1554
1555 gpiod_set_consumer_name(slp_tr, "slp_tr");
1556
1557 /* Reset */
1558 if (rstn) {
1559 udelay(1);
1560 gpiod_set_value_cansleep(rstn, 1);
1561 udelay(1);
1562 gpiod_set_value_cansleep(rstn, 0);
1563 usleep_range(120, 240);
1564 }
1565
1566 hw = ieee802154_alloc_hw(sizeof(*lp), &at86rf230_ops);
1567 if (!hw)
1568 return -ENOMEM;
1569
1570 lp = hw->priv;
1571 lp->hw = hw;
1572 lp->spi = spi;
1573 lp->slp_tr = slp_tr;
1574 hw->parent = &spi->dev;
1575 ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
1576
1577 lp->regmap = devm_regmap_init_spi(spi, &at86rf230_regmap_spi_config);
1578 if (IS_ERR(lp->regmap)) {
1579 rc = PTR_ERR(lp->regmap);
1580 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
1581 rc);
1582 goto free_dev;
1583 }
1584
1585 at86rf230_setup_spi_messages(lp, &lp->state);
1586 at86rf230_setup_spi_messages(lp, &lp->tx);
1587
1588 rc = at86rf230_detect_device(lp);
1589 if (rc < 0)
1590 goto free_dev;
1591
1592 init_completion(&lp->state_complete);
1593
1594 spi_set_drvdata(spi, lp);
1595
1596 rc = at86rf230_hw_init(lp, xtal_trim);
1597 if (rc)
1598 goto free_dev;
1599
1600 /* Read irq status register to reset irq line */
1601 rc = at86rf230_read_subreg(lp, RG_IRQ_STATUS, 0xff, 0, &status);
1602 if (rc)
1603 goto free_dev;
1604
1605 irq_type = irq_get_trigger_type(spi->irq);
1606 if (!irq_type)
1607 irq_type = IRQF_TRIGGER_HIGH;
1608
1609 rc = devm_request_irq(&spi->dev, spi->irq, at86rf230_isr,
1610 IRQF_SHARED | irq_type, dev_name(&spi->dev), lp);
1611 if (rc)
1612 goto free_dev;
1613
1614 /* disable_irq by default and wait for starting hardware */
1615 disable_irq(spi->irq);
1616
1617 /* going into sleep by default */
1618 at86rf230_sleep(lp);
1619
1620 rc = ieee802154_register_hw(lp->hw);
1621 if (rc)
1622 goto free_dev;
1623
1624 return rc;
1625
1626free_dev:
1627 ieee802154_free_hw(lp->hw);
1628
1629 return rc;
1630}
1631
1632static void at86rf230_remove(struct spi_device *spi)
1633{
1634 struct at86rf230_local *lp = spi_get_drvdata(spi);
1635
1636 /* mask all at86rf230 irq's */
1637 at86rf230_write_subreg(lp, SR_IRQ_MASK, 0);
1638 ieee802154_unregister_hw(lp->hw);
1639 ieee802154_free_hw(lp->hw);
1640 dev_dbg(&spi->dev, "unregistered at86rf230\n");
1641}
1642
1643static const struct of_device_id at86rf230_of_match[] = {
1644 { .compatible = "atmel,at86rf230", },
1645 { .compatible = "atmel,at86rf231", },
1646 { .compatible = "atmel,at86rf233", },
1647 { .compatible = "atmel,at86rf212", },
1648 { },
1649};
1650MODULE_DEVICE_TABLE(of, at86rf230_of_match);
1651
1652static const struct spi_device_id at86rf230_device_id[] = {
1653 { .name = "at86rf230", },
1654 { .name = "at86rf231", },
1655 { .name = "at86rf233", },
1656 { .name = "at86rf212", },
1657 { },
1658};
1659MODULE_DEVICE_TABLE(spi, at86rf230_device_id);
1660
1661static struct spi_driver at86rf230_driver = {
1662 .id_table = at86rf230_device_id,
1663 .driver = {
1664 .of_match_table = at86rf230_of_match,
1665 .name = "at86rf230",
1666 },
1667 .probe = at86rf230_probe,
1668 .remove = at86rf230_remove,
1669};
1670
1671module_spi_driver(at86rf230_driver);
1672
1673MODULE_DESCRIPTION("AT86RF230 Transceiver Driver");
1674MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * AT86RF230/RF231 driver
4 *
5 * Copyright (C) 2009-2012 Siemens AG
6 *
7 * Written by:
8 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
9 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
10 * Alexander Aring <aar@pengutronix.de>
11 */
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/hrtimer.h>
15#include <linux/jiffies.h>
16#include <linux/interrupt.h>
17#include <linux/irq.h>
18#include <linux/gpio.h>
19#include <linux/delay.h>
20#include <linux/spi/spi.h>
21#include <linux/spi/at86rf230.h>
22#include <linux/regmap.h>
23#include <linux/skbuff.h>
24#include <linux/of_gpio.h>
25#include <linux/ieee802154.h>
26
27#include <net/mac802154.h>
28#include <net/cfg802154.h>
29
30#include "at86rf230.h"
31
32struct at86rf230_local;
33/* at86rf2xx chip depend data.
34 * All timings are in us.
35 */
36struct at86rf2xx_chip_data {
37 u16 t_sleep_cycle;
38 u16 t_channel_switch;
39 u16 t_reset_to_off;
40 u16 t_off_to_aack;
41 u16 t_off_to_tx_on;
42 u16 t_off_to_sleep;
43 u16 t_sleep_to_off;
44 u16 t_frame;
45 u16 t_p_ack;
46 int rssi_base_val;
47
48 int (*set_channel)(struct at86rf230_local *, u8, u8);
49 int (*set_txpower)(struct at86rf230_local *, s32);
50};
51
52#define AT86RF2XX_MAX_BUF (127 + 3)
53/* tx retries to access the TX_ON state
54 * if it's above then force change will be started.
55 *
56 * We assume the max_frame_retries (7) value of 802.15.4 here.
57 */
58#define AT86RF2XX_MAX_TX_RETRIES 7
59/* We use the recommended 5 minutes timeout to recalibrate */
60#define AT86RF2XX_CAL_LOOP_TIMEOUT (5 * 60 * HZ)
61
62struct at86rf230_state_change {
63 struct at86rf230_local *lp;
64 int irq;
65
66 struct hrtimer timer;
67 struct spi_message msg;
68 struct spi_transfer trx;
69 u8 buf[AT86RF2XX_MAX_BUF];
70
71 void (*complete)(void *context);
72 u8 from_state;
73 u8 to_state;
74 int trac;
75
76 bool free;
77};
78
79struct at86rf230_local {
80 struct spi_device *spi;
81
82 struct ieee802154_hw *hw;
83 struct at86rf2xx_chip_data *data;
84 struct regmap *regmap;
85 int slp_tr;
86 bool sleep;
87
88 struct completion state_complete;
89 struct at86rf230_state_change state;
90
91 unsigned long cal_timeout;
92 bool is_tx;
93 bool is_tx_from_off;
94 bool was_tx;
95 u8 tx_retry;
96 struct sk_buff *tx_skb;
97 struct at86rf230_state_change tx;
98};
99
100#define AT86RF2XX_NUMREGS 0x3F
101
102static void
103at86rf230_async_state_change(struct at86rf230_local *lp,
104 struct at86rf230_state_change *ctx,
105 const u8 state, void (*complete)(void *context));
106
107static inline void
108at86rf230_sleep(struct at86rf230_local *lp)
109{
110 if (gpio_is_valid(lp->slp_tr)) {
111 gpio_set_value(lp->slp_tr, 1);
112 usleep_range(lp->data->t_off_to_sleep,
113 lp->data->t_off_to_sleep + 10);
114 lp->sleep = true;
115 }
116}
117
118static inline void
119at86rf230_awake(struct at86rf230_local *lp)
120{
121 if (gpio_is_valid(lp->slp_tr)) {
122 gpio_set_value(lp->slp_tr, 0);
123 usleep_range(lp->data->t_sleep_to_off,
124 lp->data->t_sleep_to_off + 100);
125 lp->sleep = false;
126 }
127}
128
129static inline int
130__at86rf230_write(struct at86rf230_local *lp,
131 unsigned int addr, unsigned int data)
132{
133 bool sleep = lp->sleep;
134 int ret;
135
136 /* awake for register setting if sleep */
137 if (sleep)
138 at86rf230_awake(lp);
139
140 ret = regmap_write(lp->regmap, addr, data);
141
142 /* sleep again if was sleeping */
143 if (sleep)
144 at86rf230_sleep(lp);
145
146 return ret;
147}
148
149static inline int
150__at86rf230_read(struct at86rf230_local *lp,
151 unsigned int addr, unsigned int *data)
152{
153 bool sleep = lp->sleep;
154 int ret;
155
156 /* awake for register setting if sleep */
157 if (sleep)
158 at86rf230_awake(lp);
159
160 ret = regmap_read(lp->regmap, addr, data);
161
162 /* sleep again if was sleeping */
163 if (sleep)
164 at86rf230_sleep(lp);
165
166 return ret;
167}
168
169static inline int
170at86rf230_read_subreg(struct at86rf230_local *lp,
171 unsigned int addr, unsigned int mask,
172 unsigned int shift, unsigned int *data)
173{
174 int rc;
175
176 rc = __at86rf230_read(lp, addr, data);
177 if (!rc)
178 *data = (*data & mask) >> shift;
179
180 return rc;
181}
182
183static inline int
184at86rf230_write_subreg(struct at86rf230_local *lp,
185 unsigned int addr, unsigned int mask,
186 unsigned int shift, unsigned int data)
187{
188 bool sleep = lp->sleep;
189 int ret;
190
191 /* awake for register setting if sleep */
192 if (sleep)
193 at86rf230_awake(lp);
194
195 ret = regmap_update_bits(lp->regmap, addr, mask, data << shift);
196
197 /* sleep again if was sleeping */
198 if (sleep)
199 at86rf230_sleep(lp);
200
201 return ret;
202}
203
204static inline void
205at86rf230_slp_tr_rising_edge(struct at86rf230_local *lp)
206{
207 gpio_set_value(lp->slp_tr, 1);
208 udelay(1);
209 gpio_set_value(lp->slp_tr, 0);
210}
211
212static bool
213at86rf230_reg_writeable(struct device *dev, unsigned int reg)
214{
215 switch (reg) {
216 case RG_TRX_STATE:
217 case RG_TRX_CTRL_0:
218 case RG_TRX_CTRL_1:
219 case RG_PHY_TX_PWR:
220 case RG_PHY_ED_LEVEL:
221 case RG_PHY_CC_CCA:
222 case RG_CCA_THRES:
223 case RG_RX_CTRL:
224 case RG_SFD_VALUE:
225 case RG_TRX_CTRL_2:
226 case RG_ANT_DIV:
227 case RG_IRQ_MASK:
228 case RG_VREG_CTRL:
229 case RG_BATMON:
230 case RG_XOSC_CTRL:
231 case RG_RX_SYN:
232 case RG_XAH_CTRL_1:
233 case RG_FTN_CTRL:
234 case RG_PLL_CF:
235 case RG_PLL_DCU:
236 case RG_SHORT_ADDR_0:
237 case RG_SHORT_ADDR_1:
238 case RG_PAN_ID_0:
239 case RG_PAN_ID_1:
240 case RG_IEEE_ADDR_0:
241 case RG_IEEE_ADDR_1:
242 case RG_IEEE_ADDR_2:
243 case RG_IEEE_ADDR_3:
244 case RG_IEEE_ADDR_4:
245 case RG_IEEE_ADDR_5:
246 case RG_IEEE_ADDR_6:
247 case RG_IEEE_ADDR_7:
248 case RG_XAH_CTRL_0:
249 case RG_CSMA_SEED_0:
250 case RG_CSMA_SEED_1:
251 case RG_CSMA_BE:
252 return true;
253 default:
254 return false;
255 }
256}
257
258static bool
259at86rf230_reg_readable(struct device *dev, unsigned int reg)
260{
261 bool rc;
262
263 /* all writeable are also readable */
264 rc = at86rf230_reg_writeable(dev, reg);
265 if (rc)
266 return rc;
267
268 /* readonly regs */
269 switch (reg) {
270 case RG_TRX_STATUS:
271 case RG_PHY_RSSI:
272 case RG_IRQ_STATUS:
273 case RG_PART_NUM:
274 case RG_VERSION_NUM:
275 case RG_MAN_ID_1:
276 case RG_MAN_ID_0:
277 return true;
278 default:
279 return false;
280 }
281}
282
283static bool
284at86rf230_reg_volatile(struct device *dev, unsigned int reg)
285{
286 /* can be changed during runtime */
287 switch (reg) {
288 case RG_TRX_STATUS:
289 case RG_TRX_STATE:
290 case RG_PHY_RSSI:
291 case RG_PHY_ED_LEVEL:
292 case RG_IRQ_STATUS:
293 case RG_VREG_CTRL:
294 case RG_PLL_CF:
295 case RG_PLL_DCU:
296 return true;
297 default:
298 return false;
299 }
300}
301
302static bool
303at86rf230_reg_precious(struct device *dev, unsigned int reg)
304{
305 /* don't clear irq line on read */
306 switch (reg) {
307 case RG_IRQ_STATUS:
308 return true;
309 default:
310 return false;
311 }
312}
313
314static const struct regmap_config at86rf230_regmap_spi_config = {
315 .reg_bits = 8,
316 .val_bits = 8,
317 .write_flag_mask = CMD_REG | CMD_WRITE,
318 .read_flag_mask = CMD_REG,
319 .cache_type = REGCACHE_RBTREE,
320 .max_register = AT86RF2XX_NUMREGS,
321 .writeable_reg = at86rf230_reg_writeable,
322 .readable_reg = at86rf230_reg_readable,
323 .volatile_reg = at86rf230_reg_volatile,
324 .precious_reg = at86rf230_reg_precious,
325};
326
327static void
328at86rf230_async_error_recover_complete(void *context)
329{
330 struct at86rf230_state_change *ctx = context;
331 struct at86rf230_local *lp = ctx->lp;
332
333 if (ctx->free)
334 kfree(ctx);
335
336 if (lp->was_tx) {
337 lp->was_tx = 0;
338 ieee802154_xmit_hw_error(lp->hw, lp->tx_skb);
339 }
340}
341
342static void
343at86rf230_async_error_recover(void *context)
344{
345 struct at86rf230_state_change *ctx = context;
346 struct at86rf230_local *lp = ctx->lp;
347
348 if (lp->is_tx) {
349 lp->was_tx = 1;
350 lp->is_tx = 0;
351 }
352
353 at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON,
354 at86rf230_async_error_recover_complete);
355}
356
357static inline void
358at86rf230_async_error(struct at86rf230_local *lp,
359 struct at86rf230_state_change *ctx, int rc)
360{
361 dev_err(&lp->spi->dev, "spi_async error %d\n", rc);
362
363 at86rf230_async_state_change(lp, ctx, STATE_FORCE_TRX_OFF,
364 at86rf230_async_error_recover);
365}
366
367/* Generic function to get some register value in async mode */
368static void
369at86rf230_async_read_reg(struct at86rf230_local *lp, u8 reg,
370 struct at86rf230_state_change *ctx,
371 void (*complete)(void *context))
372{
373 int rc;
374
375 u8 *tx_buf = ctx->buf;
376
377 tx_buf[0] = (reg & CMD_REG_MASK) | CMD_REG;
378 ctx->msg.complete = complete;
379 rc = spi_async(lp->spi, &ctx->msg);
380 if (rc)
381 at86rf230_async_error(lp, ctx, rc);
382}
383
384static void
385at86rf230_async_write_reg(struct at86rf230_local *lp, u8 reg, u8 val,
386 struct at86rf230_state_change *ctx,
387 void (*complete)(void *context))
388{
389 int rc;
390
391 ctx->buf[0] = (reg & CMD_REG_MASK) | CMD_REG | CMD_WRITE;
392 ctx->buf[1] = val;
393 ctx->msg.complete = complete;
394 rc = spi_async(lp->spi, &ctx->msg);
395 if (rc)
396 at86rf230_async_error(lp, ctx, rc);
397}
398
399static void
400at86rf230_async_state_assert(void *context)
401{
402 struct at86rf230_state_change *ctx = context;
403 struct at86rf230_local *lp = ctx->lp;
404 const u8 *buf = ctx->buf;
405 const u8 trx_state = buf[1] & TRX_STATE_MASK;
406
407 /* Assert state change */
408 if (trx_state != ctx->to_state) {
409 /* Special handling if transceiver state is in
410 * STATE_BUSY_RX_AACK and a SHR was detected.
411 */
412 if (trx_state == STATE_BUSY_RX_AACK) {
413 /* Undocumented race condition. If we send a state
414 * change to STATE_RX_AACK_ON the transceiver could
415 * change his state automatically to STATE_BUSY_RX_AACK
416 * if a SHR was detected. This is not an error, but we
417 * can't assert this.
418 */
419 if (ctx->to_state == STATE_RX_AACK_ON)
420 goto done;
421
422 /* If we change to STATE_TX_ON without forcing and
423 * transceiver state is STATE_BUSY_RX_AACK, we wait
424 * 'tFrame + tPAck' receiving time. In this time the
425 * PDU should be received. If the transceiver is still
426 * in STATE_BUSY_RX_AACK, we run a force state change
427 * to STATE_TX_ON. This is a timeout handling, if the
428 * transceiver stucks in STATE_BUSY_RX_AACK.
429 *
430 * Additional we do several retries to try to get into
431 * TX_ON state without forcing. If the retries are
432 * higher or equal than AT86RF2XX_MAX_TX_RETRIES we
433 * will do a force change.
434 */
435 if (ctx->to_state == STATE_TX_ON ||
436 ctx->to_state == STATE_TRX_OFF) {
437 u8 state = ctx->to_state;
438
439 if (lp->tx_retry >= AT86RF2XX_MAX_TX_RETRIES)
440 state = STATE_FORCE_TRX_OFF;
441 lp->tx_retry++;
442
443 at86rf230_async_state_change(lp, ctx, state,
444 ctx->complete);
445 return;
446 }
447 }
448
449 dev_warn(&lp->spi->dev, "unexcept state change from 0x%02x to 0x%02x. Actual state: 0x%02x\n",
450 ctx->from_state, ctx->to_state, trx_state);
451 }
452
453done:
454 if (ctx->complete)
455 ctx->complete(context);
456}
457
458static enum hrtimer_restart at86rf230_async_state_timer(struct hrtimer *timer)
459{
460 struct at86rf230_state_change *ctx =
461 container_of(timer, struct at86rf230_state_change, timer);
462 struct at86rf230_local *lp = ctx->lp;
463
464 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
465 at86rf230_async_state_assert);
466
467 return HRTIMER_NORESTART;
468}
469
470/* Do state change timing delay. */
471static void
472at86rf230_async_state_delay(void *context)
473{
474 struct at86rf230_state_change *ctx = context;
475 struct at86rf230_local *lp = ctx->lp;
476 struct at86rf2xx_chip_data *c = lp->data;
477 bool force = false;
478 ktime_t tim;
479
480 /* The force state changes are will show as normal states in the
481 * state status subregister. We change the to_state to the
482 * corresponding one and remember if it was a force change, this
483 * differs if we do a state change from STATE_BUSY_RX_AACK.
484 */
485 switch (ctx->to_state) {
486 case STATE_FORCE_TX_ON:
487 ctx->to_state = STATE_TX_ON;
488 force = true;
489 break;
490 case STATE_FORCE_TRX_OFF:
491 ctx->to_state = STATE_TRX_OFF;
492 force = true;
493 break;
494 default:
495 break;
496 }
497
498 switch (ctx->from_state) {
499 case STATE_TRX_OFF:
500 switch (ctx->to_state) {
501 case STATE_RX_AACK_ON:
502 tim = c->t_off_to_aack * NSEC_PER_USEC;
503 /* state change from TRX_OFF to RX_AACK_ON to do a
504 * calibration, we need to reset the timeout for the
505 * next one.
506 */
507 lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
508 goto change;
509 case STATE_TX_ARET_ON:
510 case STATE_TX_ON:
511 tim = c->t_off_to_tx_on * NSEC_PER_USEC;
512 /* state change from TRX_OFF to TX_ON or ARET_ON to do
513 * a calibration, we need to reset the timeout for the
514 * next one.
515 */
516 lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
517 goto change;
518 default:
519 break;
520 }
521 break;
522 case STATE_BUSY_RX_AACK:
523 switch (ctx->to_state) {
524 case STATE_TRX_OFF:
525 case STATE_TX_ON:
526 /* Wait for worst case receiving time if we
527 * didn't make a force change from BUSY_RX_AACK
528 * to TX_ON or TRX_OFF.
529 */
530 if (!force) {
531 tim = (c->t_frame + c->t_p_ack) * NSEC_PER_USEC;
532 goto change;
533 }
534 break;
535 default:
536 break;
537 }
538 break;
539 /* Default value, means RESET state */
540 case STATE_P_ON:
541 switch (ctx->to_state) {
542 case STATE_TRX_OFF:
543 tim = c->t_reset_to_off * NSEC_PER_USEC;
544 goto change;
545 default:
546 break;
547 }
548 break;
549 default:
550 break;
551 }
552
553 /* Default delay is 1us in the most cases */
554 udelay(1);
555 at86rf230_async_state_timer(&ctx->timer);
556 return;
557
558change:
559 hrtimer_start(&ctx->timer, tim, HRTIMER_MODE_REL);
560}
561
562static void
563at86rf230_async_state_change_start(void *context)
564{
565 struct at86rf230_state_change *ctx = context;
566 struct at86rf230_local *lp = ctx->lp;
567 u8 *buf = ctx->buf;
568 const u8 trx_state = buf[1] & TRX_STATE_MASK;
569
570 /* Check for "possible" STATE_TRANSITION_IN_PROGRESS */
571 if (trx_state == STATE_TRANSITION_IN_PROGRESS) {
572 udelay(1);
573 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
574 at86rf230_async_state_change_start);
575 return;
576 }
577
578 /* Check if we already are in the state which we change in */
579 if (trx_state == ctx->to_state) {
580 if (ctx->complete)
581 ctx->complete(context);
582 return;
583 }
584
585 /* Set current state to the context of state change */
586 ctx->from_state = trx_state;
587
588 /* Going into the next step for a state change which do a timing
589 * relevant delay.
590 */
591 at86rf230_async_write_reg(lp, RG_TRX_STATE, ctx->to_state, ctx,
592 at86rf230_async_state_delay);
593}
594
595static void
596at86rf230_async_state_change(struct at86rf230_local *lp,
597 struct at86rf230_state_change *ctx,
598 const u8 state, void (*complete)(void *context))
599{
600 /* Initialization for the state change context */
601 ctx->to_state = state;
602 ctx->complete = complete;
603 at86rf230_async_read_reg(lp, RG_TRX_STATUS, ctx,
604 at86rf230_async_state_change_start);
605}
606
607static void
608at86rf230_sync_state_change_complete(void *context)
609{
610 struct at86rf230_state_change *ctx = context;
611 struct at86rf230_local *lp = ctx->lp;
612
613 complete(&lp->state_complete);
614}
615
616/* This function do a sync framework above the async state change.
617 * Some callbacks of the IEEE 802.15.4 driver interface need to be
618 * handled synchronously.
619 */
620static int
621at86rf230_sync_state_change(struct at86rf230_local *lp, unsigned int state)
622{
623 unsigned long rc;
624
625 at86rf230_async_state_change(lp, &lp->state, state,
626 at86rf230_sync_state_change_complete);
627
628 rc = wait_for_completion_timeout(&lp->state_complete,
629 msecs_to_jiffies(100));
630 if (!rc) {
631 at86rf230_async_error(lp, &lp->state, -ETIMEDOUT);
632 return -ETIMEDOUT;
633 }
634
635 return 0;
636}
637
638static void
639at86rf230_tx_complete(void *context)
640{
641 struct at86rf230_state_change *ctx = context;
642 struct at86rf230_local *lp = ctx->lp;
643
644 if (ctx->trac == IEEE802154_SUCCESS)
645 ieee802154_xmit_complete(lp->hw, lp->tx_skb, false);
646 else
647 ieee802154_xmit_error(lp->hw, lp->tx_skb, ctx->trac);
648
649 kfree(ctx);
650}
651
652static void
653at86rf230_tx_on(void *context)
654{
655 struct at86rf230_state_change *ctx = context;
656 struct at86rf230_local *lp = ctx->lp;
657
658 at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON,
659 at86rf230_tx_complete);
660}
661
662static void
663at86rf230_tx_trac_check(void *context)
664{
665 struct at86rf230_state_change *ctx = context;
666 struct at86rf230_local *lp = ctx->lp;
667 u8 trac = TRAC_MASK(ctx->buf[1]);
668
669 switch (trac) {
670 case TRAC_SUCCESS:
671 case TRAC_SUCCESS_DATA_PENDING:
672 ctx->trac = IEEE802154_SUCCESS;
673 break;
674 case TRAC_CHANNEL_ACCESS_FAILURE:
675 ctx->trac = IEEE802154_CHANNEL_ACCESS_FAILURE;
676 break;
677 case TRAC_NO_ACK:
678 ctx->trac = IEEE802154_NO_ACK;
679 break;
680 default:
681 ctx->trac = IEEE802154_SYSTEM_ERROR;
682 }
683
684 at86rf230_async_state_change(lp, ctx, STATE_TX_ON, at86rf230_tx_on);
685}
686
687static void
688at86rf230_rx_read_frame_complete(void *context)
689{
690 struct at86rf230_state_change *ctx = context;
691 struct at86rf230_local *lp = ctx->lp;
692 const u8 *buf = ctx->buf;
693 struct sk_buff *skb;
694 u8 len, lqi;
695
696 len = buf[1];
697 if (!ieee802154_is_valid_psdu_len(len)) {
698 dev_vdbg(&lp->spi->dev, "corrupted frame received\n");
699 len = IEEE802154_MTU;
700 }
701 lqi = buf[2 + len];
702
703 skb = dev_alloc_skb(IEEE802154_MTU);
704 if (!skb) {
705 dev_vdbg(&lp->spi->dev, "failed to allocate sk_buff\n");
706 kfree(ctx);
707 return;
708 }
709
710 skb_put_data(skb, buf + 2, len);
711 ieee802154_rx_irqsafe(lp->hw, skb, lqi);
712 kfree(ctx);
713}
714
715static void
716at86rf230_rx_trac_check(void *context)
717{
718 struct at86rf230_state_change *ctx = context;
719 struct at86rf230_local *lp = ctx->lp;
720 u8 *buf = ctx->buf;
721 int rc;
722
723 buf[0] = CMD_FB;
724 ctx->trx.len = AT86RF2XX_MAX_BUF;
725 ctx->msg.complete = at86rf230_rx_read_frame_complete;
726 rc = spi_async(lp->spi, &ctx->msg);
727 if (rc) {
728 ctx->trx.len = 2;
729 at86rf230_async_error(lp, ctx, rc);
730 }
731}
732
733static void
734at86rf230_irq_trx_end(void *context)
735{
736 struct at86rf230_state_change *ctx = context;
737 struct at86rf230_local *lp = ctx->lp;
738
739 if (lp->is_tx) {
740 lp->is_tx = 0;
741 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx,
742 at86rf230_tx_trac_check);
743 } else {
744 at86rf230_async_read_reg(lp, RG_TRX_STATE, ctx,
745 at86rf230_rx_trac_check);
746 }
747}
748
749static void
750at86rf230_irq_status(void *context)
751{
752 struct at86rf230_state_change *ctx = context;
753 struct at86rf230_local *lp = ctx->lp;
754 const u8 *buf = ctx->buf;
755 u8 irq = buf[1];
756
757 enable_irq(lp->spi->irq);
758
759 if (irq & IRQ_TRX_END) {
760 at86rf230_irq_trx_end(ctx);
761 } else {
762 dev_err(&lp->spi->dev, "not supported irq %02x received\n",
763 irq);
764 kfree(ctx);
765 }
766}
767
768static void
769at86rf230_setup_spi_messages(struct at86rf230_local *lp,
770 struct at86rf230_state_change *state)
771{
772 state->lp = lp;
773 state->irq = lp->spi->irq;
774 spi_message_init(&state->msg);
775 state->msg.context = state;
776 state->trx.len = 2;
777 state->trx.tx_buf = state->buf;
778 state->trx.rx_buf = state->buf;
779 spi_message_add_tail(&state->trx, &state->msg);
780 hrtimer_init(&state->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
781 state->timer.function = at86rf230_async_state_timer;
782}
783
784static irqreturn_t at86rf230_isr(int irq, void *data)
785{
786 struct at86rf230_local *lp = data;
787 struct at86rf230_state_change *ctx;
788 int rc;
789
790 disable_irq_nosync(irq);
791
792 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
793 if (!ctx) {
794 enable_irq(irq);
795 return IRQ_NONE;
796 }
797
798 at86rf230_setup_spi_messages(lp, ctx);
799 /* tell on error handling to free ctx */
800 ctx->free = true;
801
802 ctx->buf[0] = (RG_IRQ_STATUS & CMD_REG_MASK) | CMD_REG;
803 ctx->msg.complete = at86rf230_irq_status;
804 rc = spi_async(lp->spi, &ctx->msg);
805 if (rc) {
806 at86rf230_async_error(lp, ctx, rc);
807 enable_irq(irq);
808 return IRQ_NONE;
809 }
810
811 return IRQ_HANDLED;
812}
813
814static void
815at86rf230_write_frame_complete(void *context)
816{
817 struct at86rf230_state_change *ctx = context;
818 struct at86rf230_local *lp = ctx->lp;
819
820 ctx->trx.len = 2;
821
822 if (gpio_is_valid(lp->slp_tr))
823 at86rf230_slp_tr_rising_edge(lp);
824 else
825 at86rf230_async_write_reg(lp, RG_TRX_STATE, STATE_BUSY_TX, ctx,
826 NULL);
827}
828
829static void
830at86rf230_write_frame(void *context)
831{
832 struct at86rf230_state_change *ctx = context;
833 struct at86rf230_local *lp = ctx->lp;
834 struct sk_buff *skb = lp->tx_skb;
835 u8 *buf = ctx->buf;
836 int rc;
837
838 lp->is_tx = 1;
839
840 buf[0] = CMD_FB | CMD_WRITE;
841 buf[1] = skb->len + 2;
842 memcpy(buf + 2, skb->data, skb->len);
843 ctx->trx.len = skb->len + 2;
844 ctx->msg.complete = at86rf230_write_frame_complete;
845 rc = spi_async(lp->spi, &ctx->msg);
846 if (rc) {
847 ctx->trx.len = 2;
848 at86rf230_async_error(lp, ctx, rc);
849 }
850}
851
852static void
853at86rf230_xmit_tx_on(void *context)
854{
855 struct at86rf230_state_change *ctx = context;
856 struct at86rf230_local *lp = ctx->lp;
857
858 at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
859 at86rf230_write_frame);
860}
861
862static void
863at86rf230_xmit_start(void *context)
864{
865 struct at86rf230_state_change *ctx = context;
866 struct at86rf230_local *lp = ctx->lp;
867
868 /* check if we change from off state */
869 if (lp->is_tx_from_off)
870 at86rf230_async_state_change(lp, ctx, STATE_TX_ARET_ON,
871 at86rf230_write_frame);
872 else
873 at86rf230_async_state_change(lp, ctx, STATE_TX_ON,
874 at86rf230_xmit_tx_on);
875}
876
877static int
878at86rf230_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
879{
880 struct at86rf230_local *lp = hw->priv;
881 struct at86rf230_state_change *ctx = &lp->tx;
882
883 lp->tx_skb = skb;
884 lp->tx_retry = 0;
885
886 /* After 5 minutes in PLL and the same frequency we run again the
887 * calibration loops which is recommended by at86rf2xx datasheets.
888 *
889 * The calibration is initiate by a state change from TRX_OFF
890 * to TX_ON, the lp->cal_timeout should be reinit by state_delay
891 * function then to start in the next 5 minutes.
892 */
893 if (time_is_before_jiffies(lp->cal_timeout)) {
894 lp->is_tx_from_off = true;
895 at86rf230_async_state_change(lp, ctx, STATE_TRX_OFF,
896 at86rf230_xmit_start);
897 } else {
898 lp->is_tx_from_off = false;
899 at86rf230_xmit_start(ctx);
900 }
901
902 return 0;
903}
904
905static int
906at86rf230_ed(struct ieee802154_hw *hw, u8 *level)
907{
908 WARN_ON(!level);
909 *level = 0xbe;
910 return 0;
911}
912
913static int
914at86rf230_start(struct ieee802154_hw *hw)
915{
916 struct at86rf230_local *lp = hw->priv;
917
918 at86rf230_awake(lp);
919 enable_irq(lp->spi->irq);
920
921 return at86rf230_sync_state_change(lp, STATE_RX_AACK_ON);
922}
923
924static void
925at86rf230_stop(struct ieee802154_hw *hw)
926{
927 struct at86rf230_local *lp = hw->priv;
928 u8 csma_seed[2];
929
930 at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
931
932 disable_irq(lp->spi->irq);
933
934 /* It's recommended to set random new csma_seeds before sleep state.
935 * Makes only sense in the stop callback, not doing this inside of
936 * at86rf230_sleep, this is also used when we don't transmit afterwards
937 * when calling start callback again.
938 */
939 get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
940 at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
941 at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
942
943 at86rf230_sleep(lp);
944}
945
946static int
947at86rf23x_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
948{
949 return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
950}
951
952#define AT86RF2XX_MAX_ED_LEVELS 0xF
953static const s32 at86rf233_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = {
954 -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000, -7800, -7600,
955 -7400, -7200, -7000, -6800, -6600, -6400,
956};
957
958static const s32 at86rf231_ed_levels[AT86RF2XX_MAX_ED_LEVELS + 1] = {
959 -9100, -8900, -8700, -8500, -8300, -8100, -7900, -7700, -7500, -7300,
960 -7100, -6900, -6700, -6500, -6300, -6100,
961};
962
963static const s32 at86rf212_ed_levels_100[AT86RF2XX_MAX_ED_LEVELS + 1] = {
964 -10000, -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200,
965 -8000, -7800, -7600, -7400, -7200, -7000,
966};
967
968static const s32 at86rf212_ed_levels_98[AT86RF2XX_MAX_ED_LEVELS + 1] = {
969 -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000,
970 -7800, -7600, -7400, -7200, -7000, -6800,
971};
972
973static inline int
974at86rf212_update_cca_ed_level(struct at86rf230_local *lp, int rssi_base_val)
975{
976 unsigned int cca_ed_thres;
977 int rc;
978
979 rc = at86rf230_read_subreg(lp, SR_CCA_ED_THRES, &cca_ed_thres);
980 if (rc < 0)
981 return rc;
982
983 switch (rssi_base_val) {
984 case -98:
985 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_98;
986 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_98);
987 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_98[cca_ed_thres];
988 break;
989 case -100:
990 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
991 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
992 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_100[cca_ed_thres];
993 break;
994 default:
995 WARN_ON(1);
996 }
997
998 return 0;
999}
1000
1001static int
1002at86rf212_set_channel(struct at86rf230_local *lp, u8 page, u8 channel)
1003{
1004 int rc;
1005
1006 if (channel == 0)
1007 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 0);
1008 else
1009 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 1);
1010 if (rc < 0)
1011 return rc;
1012
1013 if (page == 0) {
1014 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 0);
1015 lp->data->rssi_base_val = -100;
1016 } else {
1017 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 1);
1018 lp->data->rssi_base_val = -98;
1019 }
1020 if (rc < 0)
1021 return rc;
1022
1023 rc = at86rf212_update_cca_ed_level(lp, lp->data->rssi_base_val);
1024 if (rc < 0)
1025 return rc;
1026
1027 return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
1028}
1029
1030static int
1031at86rf230_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
1032{
1033 struct at86rf230_local *lp = hw->priv;
1034 int rc;
1035
1036 rc = lp->data->set_channel(lp, page, channel);
1037 /* Wait for PLL */
1038 usleep_range(lp->data->t_channel_switch,
1039 lp->data->t_channel_switch + 10);
1040
1041 lp->cal_timeout = jiffies + AT86RF2XX_CAL_LOOP_TIMEOUT;
1042 return rc;
1043}
1044
1045static int
1046at86rf230_set_hw_addr_filt(struct ieee802154_hw *hw,
1047 struct ieee802154_hw_addr_filt *filt,
1048 unsigned long changed)
1049{
1050 struct at86rf230_local *lp = hw->priv;
1051
1052 if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
1053 u16 addr = le16_to_cpu(filt->short_addr);
1054
1055 dev_vdbg(&lp->spi->dev, "%s called for saddr\n", __func__);
1056 __at86rf230_write(lp, RG_SHORT_ADDR_0, addr);
1057 __at86rf230_write(lp, RG_SHORT_ADDR_1, addr >> 8);
1058 }
1059
1060 if (changed & IEEE802154_AFILT_PANID_CHANGED) {
1061 u16 pan = le16_to_cpu(filt->pan_id);
1062
1063 dev_vdbg(&lp->spi->dev, "%s called for pan id\n", __func__);
1064 __at86rf230_write(lp, RG_PAN_ID_0, pan);
1065 __at86rf230_write(lp, RG_PAN_ID_1, pan >> 8);
1066 }
1067
1068 if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
1069 u8 i, addr[8];
1070
1071 memcpy(addr, &filt->ieee_addr, 8);
1072 dev_vdbg(&lp->spi->dev, "%s called for IEEE addr\n", __func__);
1073 for (i = 0; i < 8; i++)
1074 __at86rf230_write(lp, RG_IEEE_ADDR_0 + i, addr[i]);
1075 }
1076
1077 if (changed & IEEE802154_AFILT_PANC_CHANGED) {
1078 dev_vdbg(&lp->spi->dev, "%s called for panc change\n", __func__);
1079 if (filt->pan_coord)
1080 at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 1);
1081 else
1082 at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 0);
1083 }
1084
1085 return 0;
1086}
1087
1088#define AT86RF23X_MAX_TX_POWERS 0xF
1089static const s32 at86rf233_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1090 400, 370, 340, 300, 250, 200, 100, 0, -100, -200, -300, -400, -600,
1091 -800, -1200, -1700,
1092};
1093
1094static const s32 at86rf231_powers[AT86RF23X_MAX_TX_POWERS + 1] = {
1095 300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700,
1096 -900, -1200, -1700,
1097};
1098
1099#define AT86RF212_MAX_TX_POWERS 0x1F
1100static const s32 at86rf212_powers[AT86RF212_MAX_TX_POWERS + 1] = {
1101 500, 400, 300, 200, 100, 0, -100, -200, -300, -400, -500, -600, -700,
1102 -800, -900, -1000, -1100, -1200, -1300, -1400, -1500, -1600, -1700,
1103 -1800, -1900, -2000, -2100, -2200, -2300, -2400, -2500, -2600,
1104};
1105
1106static int
1107at86rf23x_set_txpower(struct at86rf230_local *lp, s32 mbm)
1108{
1109 u32 i;
1110
1111 for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1112 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1113 return at86rf230_write_subreg(lp, SR_TX_PWR_23X, i);
1114 }
1115
1116 return -EINVAL;
1117}
1118
1119static int
1120at86rf212_set_txpower(struct at86rf230_local *lp, s32 mbm)
1121{
1122 u32 i;
1123
1124 for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
1125 if (lp->hw->phy->supported.tx_powers[i] == mbm)
1126 return at86rf230_write_subreg(lp, SR_TX_PWR_212, i);
1127 }
1128
1129 return -EINVAL;
1130}
1131
1132static int
1133at86rf230_set_txpower(struct ieee802154_hw *hw, s32 mbm)
1134{
1135 struct at86rf230_local *lp = hw->priv;
1136
1137 return lp->data->set_txpower(lp, mbm);
1138}
1139
1140static int
1141at86rf230_set_lbt(struct ieee802154_hw *hw, bool on)
1142{
1143 struct at86rf230_local *lp = hw->priv;
1144
1145 return at86rf230_write_subreg(lp, SR_CSMA_LBT_MODE, on);
1146}
1147
1148static int
1149at86rf230_set_cca_mode(struct ieee802154_hw *hw,
1150 const struct wpan_phy_cca *cca)
1151{
1152 struct at86rf230_local *lp = hw->priv;
1153 u8 val;
1154
1155 /* mapping 802.15.4 to driver spec */
1156 switch (cca->mode) {
1157 case NL802154_CCA_ENERGY:
1158 val = 1;
1159 break;
1160 case NL802154_CCA_CARRIER:
1161 val = 2;
1162 break;
1163 case NL802154_CCA_ENERGY_CARRIER:
1164 switch (cca->opt) {
1165 case NL802154_CCA_OPT_ENERGY_CARRIER_AND:
1166 val = 3;
1167 break;
1168 case NL802154_CCA_OPT_ENERGY_CARRIER_OR:
1169 val = 0;
1170 break;
1171 default:
1172 return -EINVAL;
1173 }
1174 break;
1175 default:
1176 return -EINVAL;
1177 }
1178
1179 return at86rf230_write_subreg(lp, SR_CCA_MODE, val);
1180}
1181
1182static int
1183at86rf230_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
1184{
1185 struct at86rf230_local *lp = hw->priv;
1186 u32 i;
1187
1188 for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) {
1189 if (hw->phy->supported.cca_ed_levels[i] == mbm)
1190 return at86rf230_write_subreg(lp, SR_CCA_ED_THRES, i);
1191 }
1192
1193 return -EINVAL;
1194}
1195
1196static int
1197at86rf230_set_csma_params(struct ieee802154_hw *hw, u8 min_be, u8 max_be,
1198 u8 retries)
1199{
1200 struct at86rf230_local *lp = hw->priv;
1201 int rc;
1202
1203 rc = at86rf230_write_subreg(lp, SR_MIN_BE, min_be);
1204 if (rc)
1205 return rc;
1206
1207 rc = at86rf230_write_subreg(lp, SR_MAX_BE, max_be);
1208 if (rc)
1209 return rc;
1210
1211 return at86rf230_write_subreg(lp, SR_MAX_CSMA_RETRIES, retries);
1212}
1213
1214static int
1215at86rf230_set_frame_retries(struct ieee802154_hw *hw, s8 retries)
1216{
1217 struct at86rf230_local *lp = hw->priv;
1218
1219 return at86rf230_write_subreg(lp, SR_MAX_FRAME_RETRIES, retries);
1220}
1221
1222static int
1223at86rf230_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
1224{
1225 struct at86rf230_local *lp = hw->priv;
1226 int rc;
1227
1228 if (on) {
1229 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 1);
1230 if (rc < 0)
1231 return rc;
1232
1233 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 1);
1234 if (rc < 0)
1235 return rc;
1236 } else {
1237 rc = at86rf230_write_subreg(lp, SR_AACK_PROM_MODE, 0);
1238 if (rc < 0)
1239 return rc;
1240
1241 rc = at86rf230_write_subreg(lp, SR_AACK_DIS_ACK, 0);
1242 if (rc < 0)
1243 return rc;
1244 }
1245
1246 return 0;
1247}
1248
1249static const struct ieee802154_ops at86rf230_ops = {
1250 .owner = THIS_MODULE,
1251 .xmit_async = at86rf230_xmit,
1252 .ed = at86rf230_ed,
1253 .set_channel = at86rf230_channel,
1254 .start = at86rf230_start,
1255 .stop = at86rf230_stop,
1256 .set_hw_addr_filt = at86rf230_set_hw_addr_filt,
1257 .set_txpower = at86rf230_set_txpower,
1258 .set_lbt = at86rf230_set_lbt,
1259 .set_cca_mode = at86rf230_set_cca_mode,
1260 .set_cca_ed_level = at86rf230_set_cca_ed_level,
1261 .set_csma_params = at86rf230_set_csma_params,
1262 .set_frame_retries = at86rf230_set_frame_retries,
1263 .set_promiscuous_mode = at86rf230_set_promiscuous_mode,
1264};
1265
1266static struct at86rf2xx_chip_data at86rf233_data = {
1267 .t_sleep_cycle = 330,
1268 .t_channel_switch = 11,
1269 .t_reset_to_off = 26,
1270 .t_off_to_aack = 80,
1271 .t_off_to_tx_on = 80,
1272 .t_off_to_sleep = 35,
1273 .t_sleep_to_off = 1000,
1274 .t_frame = 4096,
1275 .t_p_ack = 545,
1276 .rssi_base_val = -94,
1277 .set_channel = at86rf23x_set_channel,
1278 .set_txpower = at86rf23x_set_txpower,
1279};
1280
1281static struct at86rf2xx_chip_data at86rf231_data = {
1282 .t_sleep_cycle = 330,
1283 .t_channel_switch = 24,
1284 .t_reset_to_off = 37,
1285 .t_off_to_aack = 110,
1286 .t_off_to_tx_on = 110,
1287 .t_off_to_sleep = 35,
1288 .t_sleep_to_off = 1000,
1289 .t_frame = 4096,
1290 .t_p_ack = 545,
1291 .rssi_base_val = -91,
1292 .set_channel = at86rf23x_set_channel,
1293 .set_txpower = at86rf23x_set_txpower,
1294};
1295
1296static struct at86rf2xx_chip_data at86rf212_data = {
1297 .t_sleep_cycle = 330,
1298 .t_channel_switch = 11,
1299 .t_reset_to_off = 26,
1300 .t_off_to_aack = 200,
1301 .t_off_to_tx_on = 200,
1302 .t_off_to_sleep = 35,
1303 .t_sleep_to_off = 1000,
1304 .t_frame = 4096,
1305 .t_p_ack = 545,
1306 .rssi_base_val = -100,
1307 .set_channel = at86rf212_set_channel,
1308 .set_txpower = at86rf212_set_txpower,
1309};
1310
1311static int at86rf230_hw_init(struct at86rf230_local *lp, u8 xtal_trim)
1312{
1313 int rc, irq_type, irq_pol = IRQ_ACTIVE_HIGH;
1314 unsigned int dvdd;
1315 u8 csma_seed[2];
1316
1317 rc = at86rf230_sync_state_change(lp, STATE_FORCE_TRX_OFF);
1318 if (rc)
1319 return rc;
1320
1321 irq_type = irq_get_trigger_type(lp->spi->irq);
1322 if (irq_type == IRQ_TYPE_EDGE_FALLING ||
1323 irq_type == IRQ_TYPE_LEVEL_LOW)
1324 irq_pol = IRQ_ACTIVE_LOW;
1325
1326 rc = at86rf230_write_subreg(lp, SR_IRQ_POLARITY, irq_pol);
1327 if (rc)
1328 return rc;
1329
1330 rc = at86rf230_write_subreg(lp, SR_RX_SAFE_MODE, 1);
1331 if (rc)
1332 return rc;
1333
1334 rc = at86rf230_write_subreg(lp, SR_IRQ_MASK, IRQ_TRX_END);
1335 if (rc)
1336 return rc;
1337
1338 /* reset values differs in at86rf231 and at86rf233 */
1339 rc = at86rf230_write_subreg(lp, SR_IRQ_MASK_MODE, 0);
1340 if (rc)
1341 return rc;
1342
1343 get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
1344 rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
1345 if (rc)
1346 return rc;
1347 rc = at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
1348 if (rc)
1349 return rc;
1350
1351 /* CLKM changes are applied immediately */
1352 rc = at86rf230_write_subreg(lp, SR_CLKM_SHA_SEL, 0x00);
1353 if (rc)
1354 return rc;
1355
1356 /* Turn CLKM Off */
1357 rc = at86rf230_write_subreg(lp, SR_CLKM_CTRL, 0x00);
1358 if (rc)
1359 return rc;
1360 /* Wait the next SLEEP cycle */
1361 usleep_range(lp->data->t_sleep_cycle,
1362 lp->data->t_sleep_cycle + 100);
1363
1364 /* xtal_trim value is calculated by:
1365 * CL = 0.5 * (CX + CTRIM + CPAR)
1366 *
1367 * whereas:
1368 * CL = capacitor of used crystal
1369 * CX = connected capacitors at xtal pins
1370 * CPAR = in all at86rf2xx datasheets this is a constant value 3 pF,
1371 * but this is different on each board setup. You need to fine
1372 * tuning this value via CTRIM.
1373 * CTRIM = variable capacitor setting. Resolution is 0.3 pF range is
1374 * 0 pF upto 4.5 pF.
1375 *
1376 * Examples:
1377 * atben transceiver:
1378 *
1379 * CL = 8 pF
1380 * CX = 12 pF
1381 * CPAR = 3 pF (We assume the magic constant from datasheet)
1382 * CTRIM = 0.9 pF
1383 *
1384 * (12+0.9+3)/2 = 7.95 which is nearly at 8 pF
1385 *
1386 * xtal_trim = 0x3
1387 *
1388 * openlabs transceiver:
1389 *
1390 * CL = 16 pF
1391 * CX = 22 pF
1392 * CPAR = 3 pF (We assume the magic constant from datasheet)
1393 * CTRIM = 4.5 pF
1394 *
1395 * (22+4.5+3)/2 = 14.75 which is the nearest value to 16 pF
1396 *
1397 * xtal_trim = 0xf
1398 */
1399 rc = at86rf230_write_subreg(lp, SR_XTAL_TRIM, xtal_trim);
1400 if (rc)
1401 return rc;
1402
1403 rc = at86rf230_read_subreg(lp, SR_DVDD_OK, &dvdd);
1404 if (rc)
1405 return rc;
1406 if (!dvdd) {
1407 dev_err(&lp->spi->dev, "DVDD error\n");
1408 return -EINVAL;
1409 }
1410
1411 /* Force setting slotted operation bit to 0. Sometimes the atben
1412 * sets this bit and I don't know why. We set this always force
1413 * to zero while probing.
1414 */
1415 return at86rf230_write_subreg(lp, SR_SLOTTED_OPERATION, 0);
1416}
1417
1418static int
1419at86rf230_get_pdata(struct spi_device *spi, int *rstn, int *slp_tr,
1420 u8 *xtal_trim)
1421{
1422 struct at86rf230_platform_data *pdata = spi->dev.platform_data;
1423 int ret;
1424
1425 if (!IS_ENABLED(CONFIG_OF) || !spi->dev.of_node) {
1426 if (!pdata)
1427 return -ENOENT;
1428
1429 *rstn = pdata->rstn;
1430 *slp_tr = pdata->slp_tr;
1431 *xtal_trim = pdata->xtal_trim;
1432 return 0;
1433 }
1434
1435 *rstn = of_get_named_gpio(spi->dev.of_node, "reset-gpio", 0);
1436 *slp_tr = of_get_named_gpio(spi->dev.of_node, "sleep-gpio", 0);
1437 ret = of_property_read_u8(spi->dev.of_node, "xtal-trim", xtal_trim);
1438 if (ret < 0 && ret != -EINVAL)
1439 return ret;
1440
1441 return 0;
1442}
1443
1444static int
1445at86rf230_detect_device(struct at86rf230_local *lp)
1446{
1447 unsigned int part, version, val;
1448 u16 man_id = 0;
1449 const char *chip;
1450 int rc;
1451
1452 rc = __at86rf230_read(lp, RG_MAN_ID_0, &val);
1453 if (rc)
1454 return rc;
1455 man_id |= val;
1456
1457 rc = __at86rf230_read(lp, RG_MAN_ID_1, &val);
1458 if (rc)
1459 return rc;
1460 man_id |= (val << 8);
1461
1462 rc = __at86rf230_read(lp, RG_PART_NUM, &part);
1463 if (rc)
1464 return rc;
1465
1466 rc = __at86rf230_read(lp, RG_VERSION_NUM, &version);
1467 if (rc)
1468 return rc;
1469
1470 if (man_id != 0x001f) {
1471 dev_err(&lp->spi->dev, "Non-Atmel dev found (MAN_ID %02x %02x)\n",
1472 man_id >> 8, man_id & 0xFF);
1473 return -EINVAL;
1474 }
1475
1476 lp->hw->flags = IEEE802154_HW_TX_OMIT_CKSUM |
1477 IEEE802154_HW_CSMA_PARAMS |
1478 IEEE802154_HW_FRAME_RETRIES | IEEE802154_HW_AFILT |
1479 IEEE802154_HW_PROMISCUOUS;
1480
1481 lp->hw->phy->flags = WPAN_PHY_FLAG_TXPOWER |
1482 WPAN_PHY_FLAG_CCA_ED_LEVEL |
1483 WPAN_PHY_FLAG_CCA_MODE;
1484
1485 lp->hw->phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY) |
1486 BIT(NL802154_CCA_CARRIER) | BIT(NL802154_CCA_ENERGY_CARRIER);
1487 lp->hw->phy->supported.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND) |
1488 BIT(NL802154_CCA_OPT_ENERGY_CARRIER_OR);
1489
1490 lp->hw->phy->cca.mode = NL802154_CCA_ENERGY;
1491
1492 switch (part) {
1493 case 2:
1494 chip = "at86rf230";
1495 rc = -ENOTSUPP;
1496 goto not_supp;
1497 case 3:
1498 chip = "at86rf231";
1499 lp->data = &at86rf231_data;
1500 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1501 lp->hw->phy->current_channel = 11;
1502 lp->hw->phy->supported.tx_powers = at86rf231_powers;
1503 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf231_powers);
1504 lp->hw->phy->supported.cca_ed_levels = at86rf231_ed_levels;
1505 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf231_ed_levels);
1506 break;
1507 case 7:
1508 chip = "at86rf212";
1509 lp->data = &at86rf212_data;
1510 lp->hw->flags |= IEEE802154_HW_LBT;
1511 lp->hw->phy->supported.channels[0] = 0x00007FF;
1512 lp->hw->phy->supported.channels[2] = 0x00007FF;
1513 lp->hw->phy->current_channel = 5;
1514 lp->hw->phy->supported.lbt = NL802154_SUPPORTED_BOOL_BOTH;
1515 lp->hw->phy->supported.tx_powers = at86rf212_powers;
1516 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf212_powers);
1517 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
1518 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
1519 break;
1520 case 11:
1521 chip = "at86rf233";
1522 lp->data = &at86rf233_data;
1523 lp->hw->phy->supported.channels[0] = 0x7FFF800;
1524 lp->hw->phy->current_channel = 13;
1525 lp->hw->phy->supported.tx_powers = at86rf233_powers;
1526 lp->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf233_powers);
1527 lp->hw->phy->supported.cca_ed_levels = at86rf233_ed_levels;
1528 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf233_ed_levels);
1529 break;
1530 default:
1531 chip = "unknown";
1532 rc = -ENOTSUPP;
1533 goto not_supp;
1534 }
1535
1536 lp->hw->phy->cca_ed_level = lp->hw->phy->supported.cca_ed_levels[7];
1537 lp->hw->phy->transmit_power = lp->hw->phy->supported.tx_powers[0];
1538
1539not_supp:
1540 dev_info(&lp->spi->dev, "Detected %s chip version %d\n", chip, version);
1541
1542 return rc;
1543}
1544
1545static int at86rf230_probe(struct spi_device *spi)
1546{
1547 struct ieee802154_hw *hw;
1548 struct at86rf230_local *lp;
1549 unsigned int status;
1550 int rc, irq_type, rstn, slp_tr;
1551 u8 xtal_trim = 0;
1552
1553 if (!spi->irq) {
1554 dev_err(&spi->dev, "no IRQ specified\n");
1555 return -EINVAL;
1556 }
1557
1558 rc = at86rf230_get_pdata(spi, &rstn, &slp_tr, &xtal_trim);
1559 if (rc < 0) {
1560 dev_err(&spi->dev, "failed to parse platform_data: %d\n", rc);
1561 return rc;
1562 }
1563
1564 if (gpio_is_valid(rstn)) {
1565 rc = devm_gpio_request_one(&spi->dev, rstn,
1566 GPIOF_OUT_INIT_HIGH, "rstn");
1567 if (rc)
1568 return rc;
1569 }
1570
1571 if (gpio_is_valid(slp_tr)) {
1572 rc = devm_gpio_request_one(&spi->dev, slp_tr,
1573 GPIOF_OUT_INIT_LOW, "slp_tr");
1574 if (rc)
1575 return rc;
1576 }
1577
1578 /* Reset */
1579 if (gpio_is_valid(rstn)) {
1580 udelay(1);
1581 gpio_set_value_cansleep(rstn, 0);
1582 udelay(1);
1583 gpio_set_value_cansleep(rstn, 1);
1584 usleep_range(120, 240);
1585 }
1586
1587 hw = ieee802154_alloc_hw(sizeof(*lp), &at86rf230_ops);
1588 if (!hw)
1589 return -ENOMEM;
1590
1591 lp = hw->priv;
1592 lp->hw = hw;
1593 lp->spi = spi;
1594 lp->slp_tr = slp_tr;
1595 hw->parent = &spi->dev;
1596 ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
1597
1598 lp->regmap = devm_regmap_init_spi(spi, &at86rf230_regmap_spi_config);
1599 if (IS_ERR(lp->regmap)) {
1600 rc = PTR_ERR(lp->regmap);
1601 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
1602 rc);
1603 goto free_dev;
1604 }
1605
1606 at86rf230_setup_spi_messages(lp, &lp->state);
1607 at86rf230_setup_spi_messages(lp, &lp->tx);
1608
1609 rc = at86rf230_detect_device(lp);
1610 if (rc < 0)
1611 goto free_dev;
1612
1613 init_completion(&lp->state_complete);
1614
1615 spi_set_drvdata(spi, lp);
1616
1617 rc = at86rf230_hw_init(lp, xtal_trim);
1618 if (rc)
1619 goto free_dev;
1620
1621 /* Read irq status register to reset irq line */
1622 rc = at86rf230_read_subreg(lp, RG_IRQ_STATUS, 0xff, 0, &status);
1623 if (rc)
1624 goto free_dev;
1625
1626 irq_type = irq_get_trigger_type(spi->irq);
1627 if (!irq_type)
1628 irq_type = IRQF_TRIGGER_HIGH;
1629
1630 rc = devm_request_irq(&spi->dev, spi->irq, at86rf230_isr,
1631 IRQF_SHARED | irq_type, dev_name(&spi->dev), lp);
1632 if (rc)
1633 goto free_dev;
1634
1635 /* disable_irq by default and wait for starting hardware */
1636 disable_irq(spi->irq);
1637
1638 /* going into sleep by default */
1639 at86rf230_sleep(lp);
1640
1641 rc = ieee802154_register_hw(lp->hw);
1642 if (rc)
1643 goto free_dev;
1644
1645 return rc;
1646
1647free_dev:
1648 ieee802154_free_hw(lp->hw);
1649
1650 return rc;
1651}
1652
1653static void at86rf230_remove(struct spi_device *spi)
1654{
1655 struct at86rf230_local *lp = spi_get_drvdata(spi);
1656
1657 /* mask all at86rf230 irq's */
1658 at86rf230_write_subreg(lp, SR_IRQ_MASK, 0);
1659 ieee802154_unregister_hw(lp->hw);
1660 ieee802154_free_hw(lp->hw);
1661 dev_dbg(&spi->dev, "unregistered at86rf230\n");
1662}
1663
1664static const struct of_device_id at86rf230_of_match[] = {
1665 { .compatible = "atmel,at86rf230", },
1666 { .compatible = "atmel,at86rf231", },
1667 { .compatible = "atmel,at86rf233", },
1668 { .compatible = "atmel,at86rf212", },
1669 { },
1670};
1671MODULE_DEVICE_TABLE(of, at86rf230_of_match);
1672
1673static const struct spi_device_id at86rf230_device_id[] = {
1674 { .name = "at86rf230", },
1675 { .name = "at86rf231", },
1676 { .name = "at86rf233", },
1677 { .name = "at86rf212", },
1678 { },
1679};
1680MODULE_DEVICE_TABLE(spi, at86rf230_device_id);
1681
1682static struct spi_driver at86rf230_driver = {
1683 .id_table = at86rf230_device_id,
1684 .driver = {
1685 .of_match_table = of_match_ptr(at86rf230_of_match),
1686 .name = "at86rf230",
1687 },
1688 .probe = at86rf230_probe,
1689 .remove = at86rf230_remove,
1690};
1691
1692module_spi_driver(at86rf230_driver);
1693
1694MODULE_DESCRIPTION("AT86RF230 Transceiver Driver");
1695MODULE_LICENSE("GPL v2");