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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* Driver for TI CC2520 802.15.4 Wireless-PAN Networking controller
3 *
4 * Copyright (C) 2014 Varka Bhadram <varkab@cdac.in>
5 * Md.Jamal Mohiuddin <mjmohiuddin@cdac.in>
6 * P Sowjanya <sowjanyap@cdac.in>
7 */
8#include <linux/kernel.h>
9#include <linux/module.h>
10#include <linux/gpio/consumer.h>
11#include <linux/delay.h>
12#include <linux/spi/spi.h>
13#include <linux/property.h>
14#include <linux/workqueue.h>
15#include <linux/interrupt.h>
16#include <linux/skbuff.h>
17#include <linux/ieee802154.h>
18#include <linux/crc-ccitt.h>
19#include <linux/unaligned.h>
20
21#include <net/mac802154.h>
22#include <net/cfg802154.h>
23
24#define SPI_COMMAND_BUFFER 3
25#define HIGH 1
26#define LOW 0
27#define STATE_IDLE 0
28#define RSSI_VALID 0
29#define RSSI_OFFSET 78
30
31#define CC2520_RAM_SIZE 640
32#define CC2520_FIFO_SIZE 128
33
34#define CC2520RAM_TXFIFO 0x100
35#define CC2520RAM_RXFIFO 0x180
36#define CC2520RAM_IEEEADDR 0x3EA
37#define CC2520RAM_PANID 0x3F2
38#define CC2520RAM_SHORTADDR 0x3F4
39
40#define CC2520_FREG_MASK 0x3F
41
42/* status byte values */
43#define CC2520_STATUS_XOSC32M_STABLE BIT(7)
44#define CC2520_STATUS_RSSI_VALID BIT(6)
45#define CC2520_STATUS_TX_UNDERFLOW BIT(3)
46
47/* IEEE-802.15.4 defined constants (2.4 GHz logical channels) */
48#define CC2520_MINCHANNEL 11
49#define CC2520_MAXCHANNEL 26
50#define CC2520_CHANNEL_SPACING 5
51
52/* command strobes */
53#define CC2520_CMD_SNOP 0x00
54#define CC2520_CMD_IBUFLD 0x02
55#define CC2520_CMD_SIBUFEX 0x03
56#define CC2520_CMD_SSAMPLECCA 0x04
57#define CC2520_CMD_SRES 0x0f
58#define CC2520_CMD_MEMORY_MASK 0x0f
59#define CC2520_CMD_MEMORY_READ 0x10
60#define CC2520_CMD_MEMORY_WRITE 0x20
61#define CC2520_CMD_RXBUF 0x30
62#define CC2520_CMD_RXBUFCP 0x38
63#define CC2520_CMD_RXBUFMOV 0x32
64#define CC2520_CMD_TXBUF 0x3A
65#define CC2520_CMD_TXBUFCP 0x3E
66#define CC2520_CMD_RANDOM 0x3C
67#define CC2520_CMD_SXOSCON 0x40
68#define CC2520_CMD_STXCAL 0x41
69#define CC2520_CMD_SRXON 0x42
70#define CC2520_CMD_STXON 0x43
71#define CC2520_CMD_STXONCCA 0x44
72#define CC2520_CMD_SRFOFF 0x45
73#define CC2520_CMD_SXOSCOFF 0x46
74#define CC2520_CMD_SFLUSHRX 0x47
75#define CC2520_CMD_SFLUSHTX 0x48
76#define CC2520_CMD_SACK 0x49
77#define CC2520_CMD_SACKPEND 0x4A
78#define CC2520_CMD_SNACK 0x4B
79#define CC2520_CMD_SRXMASKBITSET 0x4C
80#define CC2520_CMD_SRXMASKBITCLR 0x4D
81#define CC2520_CMD_RXMASKAND 0x4E
82#define CC2520_CMD_RXMASKOR 0x4F
83#define CC2520_CMD_MEMCP 0x50
84#define CC2520_CMD_MEMCPR 0x52
85#define CC2520_CMD_MEMXCP 0x54
86#define CC2520_CMD_MEMXWR 0x56
87#define CC2520_CMD_BCLR 0x58
88#define CC2520_CMD_BSET 0x59
89#define CC2520_CMD_CTR_UCTR 0x60
90#define CC2520_CMD_CBCMAC 0x64
91#define CC2520_CMD_UCBCMAC 0x66
92#define CC2520_CMD_CCM 0x68
93#define CC2520_CMD_UCCM 0x6A
94#define CC2520_CMD_ECB 0x70
95#define CC2520_CMD_ECBO 0x72
96#define CC2520_CMD_ECBX 0x74
97#define CC2520_CMD_INC 0x78
98#define CC2520_CMD_ABORT 0x7F
99#define CC2520_CMD_REGISTER_READ 0x80
100#define CC2520_CMD_REGISTER_WRITE 0xC0
101
102/* status registers */
103#define CC2520_CHIPID 0x40
104#define CC2520_VERSION 0x42
105#define CC2520_EXTCLOCK 0x44
106#define CC2520_MDMCTRL0 0x46
107#define CC2520_MDMCTRL1 0x47
108#define CC2520_FREQEST 0x48
109#define CC2520_RXCTRL 0x4A
110#define CC2520_FSCTRL 0x4C
111#define CC2520_FSCAL0 0x4E
112#define CC2520_FSCAL1 0x4F
113#define CC2520_FSCAL2 0x50
114#define CC2520_FSCAL3 0x51
115#define CC2520_AGCCTRL0 0x52
116#define CC2520_AGCCTRL1 0x53
117#define CC2520_AGCCTRL2 0x54
118#define CC2520_AGCCTRL3 0x55
119#define CC2520_ADCTEST0 0x56
120#define CC2520_ADCTEST1 0x57
121#define CC2520_ADCTEST2 0x58
122#define CC2520_MDMTEST0 0x5A
123#define CC2520_MDMTEST1 0x5B
124#define CC2520_DACTEST0 0x5C
125#define CC2520_DACTEST1 0x5D
126#define CC2520_ATEST 0x5E
127#define CC2520_DACTEST2 0x5F
128#define CC2520_PTEST0 0x60
129#define CC2520_PTEST1 0x61
130#define CC2520_RESERVED 0x62
131#define CC2520_DPUBIST 0x7A
132#define CC2520_ACTBIST 0x7C
133#define CC2520_RAMBIST 0x7E
134
135/* frame registers */
136#define CC2520_FRMFILT0 0x00
137#define CC2520_FRMFILT1 0x01
138#define CC2520_SRCMATCH 0x02
139#define CC2520_SRCSHORTEN0 0x04
140#define CC2520_SRCSHORTEN1 0x05
141#define CC2520_SRCSHORTEN2 0x06
142#define CC2520_SRCEXTEN0 0x08
143#define CC2520_SRCEXTEN1 0x09
144#define CC2520_SRCEXTEN2 0x0A
145#define CC2520_FRMCTRL0 0x0C
146#define CC2520_FRMCTRL1 0x0D
147#define CC2520_RXENABLE0 0x0E
148#define CC2520_RXENABLE1 0x0F
149#define CC2520_EXCFLAG0 0x10
150#define CC2520_EXCFLAG1 0x11
151#define CC2520_EXCFLAG2 0x12
152#define CC2520_EXCMASKA0 0x14
153#define CC2520_EXCMASKA1 0x15
154#define CC2520_EXCMASKA2 0x16
155#define CC2520_EXCMASKB0 0x18
156#define CC2520_EXCMASKB1 0x19
157#define CC2520_EXCMASKB2 0x1A
158#define CC2520_EXCBINDX0 0x1C
159#define CC2520_EXCBINDX1 0x1D
160#define CC2520_EXCBINDY0 0x1E
161#define CC2520_EXCBINDY1 0x1F
162#define CC2520_GPIOCTRL0 0x20
163#define CC2520_GPIOCTRL1 0x21
164#define CC2520_GPIOCTRL2 0x22
165#define CC2520_GPIOCTRL3 0x23
166#define CC2520_GPIOCTRL4 0x24
167#define CC2520_GPIOCTRL5 0x25
168#define CC2520_GPIOPOLARITY 0x26
169#define CC2520_GPIOCTRL 0x28
170#define CC2520_DPUCON 0x2A
171#define CC2520_DPUSTAT 0x2C
172#define CC2520_FREQCTRL 0x2E
173#define CC2520_FREQTUNE 0x2F
174#define CC2520_TXPOWER 0x30
175#define CC2520_TXCTRL 0x31
176#define CC2520_FSMSTAT0 0x32
177#define CC2520_FSMSTAT1 0x33
178#define CC2520_FIFOPCTRL 0x34
179#define CC2520_FSMCTRL 0x35
180#define CC2520_CCACTRL0 0x36
181#define CC2520_CCACTRL1 0x37
182#define CC2520_RSSI 0x38
183#define CC2520_RSSISTAT 0x39
184#define CC2520_RXFIRST 0x3C
185#define CC2520_RXFIFOCNT 0x3E
186#define CC2520_TXFIFOCNT 0x3F
187
188/* CC2520_FRMFILT0 */
189#define FRMFILT0_FRAME_FILTER_EN BIT(0)
190#define FRMFILT0_PAN_COORDINATOR BIT(1)
191
192/* CC2520_FRMCTRL0 */
193#define FRMCTRL0_AUTOACK BIT(5)
194#define FRMCTRL0_AUTOCRC BIT(6)
195
196/* CC2520_FRMCTRL1 */
197#define FRMCTRL1_SET_RXENMASK_ON_TX BIT(0)
198#define FRMCTRL1_IGNORE_TX_UNDERF BIT(1)
199
200/* Driver private information */
201struct cc2520_private {
202 struct spi_device *spi; /* SPI device structure */
203 struct ieee802154_hw *hw; /* IEEE-802.15.4 device */
204 u8 *buf; /* SPI TX/Rx data buffer */
205 struct mutex buffer_mutex; /* SPI buffer mutex */
206 bool is_tx; /* Flag for sync b/w Tx and Rx */
207 bool amplified; /* Flag for CC2591 */
208 struct gpio_desc *fifo_pin; /* FIFO GPIO pin number */
209 struct work_struct fifop_irqwork;/* Workqueue for FIFOP */
210 spinlock_t lock; /* Lock for is_tx*/
211 struct completion tx_complete; /* Work completion for Tx */
212 bool promiscuous; /* Flag for promiscuous mode */
213};
214
215/* Generic Functions */
216static int
217cc2520_cmd_strobe(struct cc2520_private *priv, u8 cmd)
218{
219 int ret;
220 struct spi_message msg;
221 struct spi_transfer xfer = {
222 .len = 0,
223 .tx_buf = priv->buf,
224 .rx_buf = priv->buf,
225 };
226
227 spi_message_init(&msg);
228 spi_message_add_tail(&xfer, &msg);
229
230 mutex_lock(&priv->buffer_mutex);
231 priv->buf[xfer.len++] = cmd;
232 dev_vdbg(&priv->spi->dev,
233 "command strobe buf[0] = %02x\n",
234 priv->buf[0]);
235
236 ret = spi_sync(priv->spi, &msg);
237 dev_vdbg(&priv->spi->dev,
238 "buf[0] = %02x\n", priv->buf[0]);
239 mutex_unlock(&priv->buffer_mutex);
240
241 return ret;
242}
243
244static int
245cc2520_get_status(struct cc2520_private *priv, u8 *status)
246{
247 int ret;
248 struct spi_message msg;
249 struct spi_transfer xfer = {
250 .len = 0,
251 .tx_buf = priv->buf,
252 .rx_buf = priv->buf,
253 };
254
255 spi_message_init(&msg);
256 spi_message_add_tail(&xfer, &msg);
257
258 mutex_lock(&priv->buffer_mutex);
259 priv->buf[xfer.len++] = CC2520_CMD_SNOP;
260 dev_vdbg(&priv->spi->dev,
261 "get status command buf[0] = %02x\n", priv->buf[0]);
262
263 ret = spi_sync(priv->spi, &msg);
264 if (!ret)
265 *status = priv->buf[0];
266 dev_vdbg(&priv->spi->dev,
267 "buf[0] = %02x\n", priv->buf[0]);
268 mutex_unlock(&priv->buffer_mutex);
269
270 return ret;
271}
272
273static int
274cc2520_write_register(struct cc2520_private *priv, u8 reg, u8 value)
275{
276 int status;
277 struct spi_message msg;
278 struct spi_transfer xfer = {
279 .len = 0,
280 .tx_buf = priv->buf,
281 .rx_buf = priv->buf,
282 };
283
284 spi_message_init(&msg);
285 spi_message_add_tail(&xfer, &msg);
286
287 mutex_lock(&priv->buffer_mutex);
288
289 if (reg <= CC2520_FREG_MASK) {
290 priv->buf[xfer.len++] = CC2520_CMD_REGISTER_WRITE | reg;
291 priv->buf[xfer.len++] = value;
292 } else {
293 priv->buf[xfer.len++] = CC2520_CMD_MEMORY_WRITE;
294 priv->buf[xfer.len++] = reg;
295 priv->buf[xfer.len++] = value;
296 }
297 status = spi_sync(priv->spi, &msg);
298 if (msg.status)
299 status = msg.status;
300
301 mutex_unlock(&priv->buffer_mutex);
302
303 return status;
304}
305
306static int
307cc2520_write_ram(struct cc2520_private *priv, u16 reg, u8 len, u8 *data)
308{
309 int status;
310 struct spi_message msg;
311 struct spi_transfer xfer_head = {
312 .len = 0,
313 .tx_buf = priv->buf,
314 .rx_buf = priv->buf,
315 };
316
317 struct spi_transfer xfer_buf = {
318 .len = len,
319 .tx_buf = data,
320 };
321
322 mutex_lock(&priv->buffer_mutex);
323 priv->buf[xfer_head.len++] = (CC2520_CMD_MEMORY_WRITE |
324 ((reg >> 8) & 0xff));
325 priv->buf[xfer_head.len++] = reg & 0xff;
326
327 spi_message_init(&msg);
328 spi_message_add_tail(&xfer_head, &msg);
329 spi_message_add_tail(&xfer_buf, &msg);
330
331 status = spi_sync(priv->spi, &msg);
332 dev_dbg(&priv->spi->dev, "spi status = %d\n", status);
333 if (msg.status)
334 status = msg.status;
335
336 mutex_unlock(&priv->buffer_mutex);
337 return status;
338}
339
340static int
341cc2520_read_register(struct cc2520_private *priv, u8 reg, u8 *data)
342{
343 int status;
344 struct spi_message msg;
345 struct spi_transfer xfer1 = {
346 .len = 0,
347 .tx_buf = priv->buf,
348 .rx_buf = priv->buf,
349 };
350
351 struct spi_transfer xfer2 = {
352 .len = 1,
353 .rx_buf = data,
354 };
355
356 spi_message_init(&msg);
357 spi_message_add_tail(&xfer1, &msg);
358 spi_message_add_tail(&xfer2, &msg);
359
360 mutex_lock(&priv->buffer_mutex);
361 priv->buf[xfer1.len++] = CC2520_CMD_MEMORY_READ;
362 priv->buf[xfer1.len++] = reg;
363
364 status = spi_sync(priv->spi, &msg);
365 dev_dbg(&priv->spi->dev,
366 "spi status = %d\n", status);
367 if (msg.status)
368 status = msg.status;
369
370 mutex_unlock(&priv->buffer_mutex);
371
372 return status;
373}
374
375static int
376cc2520_write_txfifo(struct cc2520_private *priv, u8 pkt_len, u8 *data, u8 len)
377{
378 int status;
379
380 /* length byte must include FCS even
381 * if it is calculated in the hardware
382 */
383 int len_byte = pkt_len;
384
385 struct spi_message msg;
386
387 struct spi_transfer xfer_head = {
388 .len = 0,
389 .tx_buf = priv->buf,
390 .rx_buf = priv->buf,
391 };
392 struct spi_transfer xfer_len = {
393 .len = 1,
394 .tx_buf = &len_byte,
395 };
396 struct spi_transfer xfer_buf = {
397 .len = len,
398 .tx_buf = data,
399 };
400
401 spi_message_init(&msg);
402 spi_message_add_tail(&xfer_head, &msg);
403 spi_message_add_tail(&xfer_len, &msg);
404 spi_message_add_tail(&xfer_buf, &msg);
405
406 mutex_lock(&priv->buffer_mutex);
407 priv->buf[xfer_head.len++] = CC2520_CMD_TXBUF;
408 dev_vdbg(&priv->spi->dev,
409 "TX_FIFO cmd buf[0] = %02x\n", priv->buf[0]);
410
411 status = spi_sync(priv->spi, &msg);
412 dev_vdbg(&priv->spi->dev, "status = %d\n", status);
413 if (msg.status)
414 status = msg.status;
415 dev_vdbg(&priv->spi->dev, "status = %d\n", status);
416 dev_vdbg(&priv->spi->dev, "buf[0] = %02x\n", priv->buf[0]);
417 mutex_unlock(&priv->buffer_mutex);
418
419 return status;
420}
421
422static int
423cc2520_read_rxfifo(struct cc2520_private *priv, u8 *data, u8 len)
424{
425 int status;
426 struct spi_message msg;
427
428 struct spi_transfer xfer_head = {
429 .len = 0,
430 .tx_buf = priv->buf,
431 .rx_buf = priv->buf,
432 };
433 struct spi_transfer xfer_buf = {
434 .len = len,
435 .rx_buf = data,
436 };
437
438 spi_message_init(&msg);
439 spi_message_add_tail(&xfer_head, &msg);
440 spi_message_add_tail(&xfer_buf, &msg);
441
442 mutex_lock(&priv->buffer_mutex);
443 priv->buf[xfer_head.len++] = CC2520_CMD_RXBUF;
444
445 dev_vdbg(&priv->spi->dev, "read rxfifo buf[0] = %02x\n", priv->buf[0]);
446 dev_vdbg(&priv->spi->dev, "buf[1] = %02x\n", priv->buf[1]);
447
448 status = spi_sync(priv->spi, &msg);
449 dev_vdbg(&priv->spi->dev, "status = %d\n", status);
450 if (msg.status)
451 status = msg.status;
452 dev_vdbg(&priv->spi->dev, "status = %d\n", status);
453 dev_vdbg(&priv->spi->dev,
454 "return status buf[0] = %02x\n", priv->buf[0]);
455 dev_vdbg(&priv->spi->dev, "length buf[1] = %02x\n", priv->buf[1]);
456
457 mutex_unlock(&priv->buffer_mutex);
458
459 return status;
460}
461
462static int cc2520_start(struct ieee802154_hw *hw)
463{
464 return cc2520_cmd_strobe(hw->priv, CC2520_CMD_SRXON);
465}
466
467static void cc2520_stop(struct ieee802154_hw *hw)
468{
469 cc2520_cmd_strobe(hw->priv, CC2520_CMD_SRFOFF);
470}
471
472static int
473cc2520_tx(struct ieee802154_hw *hw, struct sk_buff *skb)
474{
475 struct cc2520_private *priv = hw->priv;
476 unsigned long flags;
477 int rc;
478 u8 status = 0;
479 u8 pkt_len;
480
481 /* In promiscuous mode we disable AUTOCRC so we can get the raw CRC
482 * values on RX. This means we need to manually add the CRC on TX.
483 */
484 if (priv->promiscuous) {
485 u16 crc = crc_ccitt(0, skb->data, skb->len);
486
487 put_unaligned_le16(crc, skb_put(skb, 2));
488 pkt_len = skb->len;
489 } else {
490 pkt_len = skb->len + 2;
491 }
492
493 rc = cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHTX);
494 if (rc)
495 goto err_tx;
496
497 rc = cc2520_write_txfifo(priv, pkt_len, skb->data, skb->len);
498 if (rc)
499 goto err_tx;
500
501 rc = cc2520_get_status(priv, &status);
502 if (rc)
503 goto err_tx;
504
505 if (status & CC2520_STATUS_TX_UNDERFLOW) {
506 rc = -EINVAL;
507 dev_err(&priv->spi->dev, "cc2520 tx underflow exception\n");
508 goto err_tx;
509 }
510
511 spin_lock_irqsave(&priv->lock, flags);
512 WARN_ON(priv->is_tx);
513 priv->is_tx = 1;
514 spin_unlock_irqrestore(&priv->lock, flags);
515
516 rc = cc2520_cmd_strobe(priv, CC2520_CMD_STXONCCA);
517 if (rc)
518 goto err;
519
520 rc = wait_for_completion_interruptible(&priv->tx_complete);
521 if (rc < 0)
522 goto err;
523
524 cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHTX);
525 cc2520_cmd_strobe(priv, CC2520_CMD_SRXON);
526
527 return rc;
528err:
529 spin_lock_irqsave(&priv->lock, flags);
530 priv->is_tx = 0;
531 spin_unlock_irqrestore(&priv->lock, flags);
532err_tx:
533 return rc;
534}
535
536static int cc2520_rx(struct cc2520_private *priv)
537{
538 u8 len = 0, lqi = 0, bytes = 1;
539 struct sk_buff *skb;
540
541 /* Read single length byte from the radio. */
542 cc2520_read_rxfifo(priv, &len, bytes);
543
544 if (!ieee802154_is_valid_psdu_len(len)) {
545 /* Corrupted frame received, clear frame buffer by
546 * reading entire buffer.
547 */
548 dev_dbg(&priv->spi->dev, "corrupted frame received\n");
549 len = IEEE802154_MTU;
550 }
551
552 skb = dev_alloc_skb(len);
553 if (!skb)
554 return -ENOMEM;
555
556 if (cc2520_read_rxfifo(priv, skb_put(skb, len), len)) {
557 dev_dbg(&priv->spi->dev, "frame reception failed\n");
558 kfree_skb(skb);
559 return -EINVAL;
560 }
561
562 /* In promiscuous mode, we configure the radio to include the
563 * CRC (AUTOCRC==0) and we pass on the packet unconditionally. If not
564 * in promiscuous mode, we check the CRC here, but leave the
565 * RSSI/LQI/CRC_OK bytes as they will get removed in the mac layer.
566 */
567 if (!priv->promiscuous) {
568 bool crc_ok;
569
570 /* Check if the CRC is valid. With AUTOCRC set, the most
571 * significant bit of the last byte returned from the CC2520
572 * is CRC_OK flag. See section 20.3.4 of the datasheet.
573 */
574 crc_ok = skb->data[len - 1] & BIT(7);
575
576 /* If we failed CRC drop the packet in the driver layer. */
577 if (!crc_ok) {
578 dev_dbg(&priv->spi->dev, "CRC check failed\n");
579 kfree_skb(skb);
580 return -EINVAL;
581 }
582
583 /* To calculate LQI, the lower 7 bits of the last byte (the
584 * correlation value provided by the radio) must be scaled to
585 * the range 0-255. According to section 20.6, the correlation
586 * value ranges from 50-110. Ideally this would be calibrated
587 * per hardware design, but we use roughly the datasheet values
588 * to get close enough while avoiding floating point.
589 */
590 lqi = skb->data[len - 1] & 0x7f;
591 if (lqi < 50)
592 lqi = 50;
593 else if (lqi > 113)
594 lqi = 113;
595 lqi = (lqi - 50) * 4;
596 }
597
598 ieee802154_rx_irqsafe(priv->hw, skb, lqi);
599
600 dev_vdbg(&priv->spi->dev, "RXFIFO: %x %x\n", len, lqi);
601
602 return 0;
603}
604
605static int
606cc2520_ed(struct ieee802154_hw *hw, u8 *level)
607{
608 struct cc2520_private *priv = hw->priv;
609 u8 status = 0xff;
610 u8 rssi;
611 int ret;
612
613 ret = cc2520_read_register(priv, CC2520_RSSISTAT, &status);
614 if (ret)
615 return ret;
616
617 if (status != RSSI_VALID)
618 return -EINVAL;
619
620 ret = cc2520_read_register(priv, CC2520_RSSI, &rssi);
621 if (ret)
622 return ret;
623
624 /* level = RSSI(rssi) - OFFSET [dBm] : offset is 76dBm */
625 *level = rssi - RSSI_OFFSET;
626
627 return 0;
628}
629
630static int
631cc2520_set_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
632{
633 struct cc2520_private *priv = hw->priv;
634 int ret;
635
636 dev_dbg(&priv->spi->dev, "trying to set channel\n");
637
638 WARN_ON(page != 0);
639 WARN_ON(channel < CC2520_MINCHANNEL);
640 WARN_ON(channel > CC2520_MAXCHANNEL);
641
642 ret = cc2520_write_register(priv, CC2520_FREQCTRL,
643 11 + 5 * (channel - 11));
644
645 return ret;
646}
647
648static int
649cc2520_filter(struct ieee802154_hw *hw,
650 struct ieee802154_hw_addr_filt *filt, unsigned long changed)
651{
652 struct cc2520_private *priv = hw->priv;
653 int ret = 0;
654
655 if (changed & IEEE802154_AFILT_PANID_CHANGED) {
656 u16 panid = le16_to_cpu(filt->pan_id);
657
658 dev_vdbg(&priv->spi->dev, "%s called for pan id\n", __func__);
659 ret = cc2520_write_ram(priv, CC2520RAM_PANID,
660 sizeof(panid), (u8 *)&panid);
661 }
662
663 if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
664 dev_vdbg(&priv->spi->dev,
665 "%s called for IEEE addr\n", __func__);
666 ret = cc2520_write_ram(priv, CC2520RAM_IEEEADDR,
667 sizeof(filt->ieee_addr),
668 (u8 *)&filt->ieee_addr);
669 }
670
671 if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
672 u16 addr = le16_to_cpu(filt->short_addr);
673
674 dev_vdbg(&priv->spi->dev, "%s called for saddr\n", __func__);
675 ret = cc2520_write_ram(priv, CC2520RAM_SHORTADDR,
676 sizeof(addr), (u8 *)&addr);
677 }
678
679 if (changed & IEEE802154_AFILT_PANC_CHANGED) {
680 u8 frmfilt0;
681
682 dev_vdbg(&priv->spi->dev,
683 "%s called for panc change\n", __func__);
684
685 cc2520_read_register(priv, CC2520_FRMFILT0, &frmfilt0);
686
687 if (filt->pan_coord)
688 frmfilt0 |= FRMFILT0_PAN_COORDINATOR;
689 else
690 frmfilt0 &= ~FRMFILT0_PAN_COORDINATOR;
691
692 ret = cc2520_write_register(priv, CC2520_FRMFILT0, frmfilt0);
693 }
694
695 return ret;
696}
697
698static inline int cc2520_set_tx_power(struct cc2520_private *priv, s32 mbm)
699{
700 u8 power;
701
702 switch (mbm) {
703 case 500:
704 power = 0xF7;
705 break;
706 case 300:
707 power = 0xF2;
708 break;
709 case 200:
710 power = 0xAB;
711 break;
712 case 100:
713 power = 0x13;
714 break;
715 case 0:
716 power = 0x32;
717 break;
718 case -200:
719 power = 0x81;
720 break;
721 case -400:
722 power = 0x88;
723 break;
724 case -700:
725 power = 0x2C;
726 break;
727 case -1800:
728 power = 0x03;
729 break;
730 default:
731 return -EINVAL;
732 }
733
734 return cc2520_write_register(priv, CC2520_TXPOWER, power);
735}
736
737static inline int cc2520_cc2591_set_tx_power(struct cc2520_private *priv,
738 s32 mbm)
739{
740 u8 power;
741
742 switch (mbm) {
743 case 1700:
744 power = 0xF9;
745 break;
746 case 1600:
747 power = 0xF0;
748 break;
749 case 1400:
750 power = 0xA0;
751 break;
752 case 1100:
753 power = 0x2C;
754 break;
755 case -100:
756 power = 0x03;
757 break;
758 case -800:
759 power = 0x01;
760 break;
761 default:
762 return -EINVAL;
763 }
764
765 return cc2520_write_register(priv, CC2520_TXPOWER, power);
766}
767
768#define CC2520_MAX_TX_POWERS 0x8
769static const s32 cc2520_powers[CC2520_MAX_TX_POWERS + 1] = {
770 500, 300, 200, 100, 0, -200, -400, -700, -1800,
771};
772
773#define CC2520_CC2591_MAX_TX_POWERS 0x5
774static const s32 cc2520_cc2591_powers[CC2520_CC2591_MAX_TX_POWERS + 1] = {
775 1700, 1600, 1400, 1100, -100, -800,
776};
777
778static int
779cc2520_set_txpower(struct ieee802154_hw *hw, s32 mbm)
780{
781 struct cc2520_private *priv = hw->priv;
782
783 if (!priv->amplified)
784 return cc2520_set_tx_power(priv, mbm);
785
786 return cc2520_cc2591_set_tx_power(priv, mbm);
787}
788
789static int
790cc2520_set_promiscuous_mode(struct ieee802154_hw *hw, bool on)
791{
792 struct cc2520_private *priv = hw->priv;
793 u8 frmfilt0;
794
795 dev_dbg(&priv->spi->dev, "%s : mode %d\n", __func__, on);
796
797 priv->promiscuous = on;
798
799 cc2520_read_register(priv, CC2520_FRMFILT0, &frmfilt0);
800
801 if (on) {
802 /* Disable automatic ACK, automatic CRC, and frame filtering. */
803 cc2520_write_register(priv, CC2520_FRMCTRL0, 0);
804 frmfilt0 &= ~FRMFILT0_FRAME_FILTER_EN;
805 } else {
806 cc2520_write_register(priv, CC2520_FRMCTRL0, FRMCTRL0_AUTOACK |
807 FRMCTRL0_AUTOCRC);
808 frmfilt0 |= FRMFILT0_FRAME_FILTER_EN;
809 }
810 return cc2520_write_register(priv, CC2520_FRMFILT0, frmfilt0);
811}
812
813static const struct ieee802154_ops cc2520_ops = {
814 .owner = THIS_MODULE,
815 .start = cc2520_start,
816 .stop = cc2520_stop,
817 .xmit_sync = cc2520_tx,
818 .ed = cc2520_ed,
819 .set_channel = cc2520_set_channel,
820 .set_hw_addr_filt = cc2520_filter,
821 .set_txpower = cc2520_set_txpower,
822 .set_promiscuous_mode = cc2520_set_promiscuous_mode,
823};
824
825static int cc2520_register(struct cc2520_private *priv)
826{
827 int ret = -ENOMEM;
828
829 priv->hw = ieee802154_alloc_hw(sizeof(*priv), &cc2520_ops);
830 if (!priv->hw)
831 goto err_ret;
832
833 priv->hw->priv = priv;
834 priv->hw->parent = &priv->spi->dev;
835 priv->hw->extra_tx_headroom = 0;
836 ieee802154_random_extended_addr(&priv->hw->phy->perm_extended_addr);
837
838 /* We do support only 2.4 Ghz */
839 priv->hw->phy->supported.channels[0] = 0x7FFF800;
840 priv->hw->flags = IEEE802154_HW_TX_OMIT_CKSUM | IEEE802154_HW_AFILT |
841 IEEE802154_HW_PROMISCUOUS;
842
843 priv->hw->phy->flags = WPAN_PHY_FLAG_TXPOWER;
844
845 if (!priv->amplified) {
846 priv->hw->phy->supported.tx_powers = cc2520_powers;
847 priv->hw->phy->supported.tx_powers_size = ARRAY_SIZE(cc2520_powers);
848 priv->hw->phy->transmit_power = priv->hw->phy->supported.tx_powers[4];
849 } else {
850 priv->hw->phy->supported.tx_powers = cc2520_cc2591_powers;
851 priv->hw->phy->supported.tx_powers_size = ARRAY_SIZE(cc2520_cc2591_powers);
852 priv->hw->phy->transmit_power = priv->hw->phy->supported.tx_powers[0];
853 }
854
855 priv->hw->phy->current_channel = 11;
856
857 dev_vdbg(&priv->spi->dev, "registered cc2520\n");
858 ret = ieee802154_register_hw(priv->hw);
859 if (ret)
860 goto err_free_device;
861
862 return 0;
863
864err_free_device:
865 ieee802154_free_hw(priv->hw);
866err_ret:
867 return ret;
868}
869
870static void cc2520_fifop_irqwork(struct work_struct *work)
871{
872 struct cc2520_private *priv
873 = container_of(work, struct cc2520_private, fifop_irqwork);
874
875 dev_dbg(&priv->spi->dev, "fifop interrupt received\n");
876
877 if (gpiod_get_value(priv->fifo_pin))
878 cc2520_rx(priv);
879 else
880 dev_dbg(&priv->spi->dev, "rxfifo overflow\n");
881
882 cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHRX);
883 cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHRX);
884}
885
886static irqreturn_t cc2520_fifop_isr(int irq, void *data)
887{
888 struct cc2520_private *priv = data;
889
890 schedule_work(&priv->fifop_irqwork);
891
892 return IRQ_HANDLED;
893}
894
895static irqreturn_t cc2520_sfd_isr(int irq, void *data)
896{
897 struct cc2520_private *priv = data;
898 unsigned long flags;
899
900 spin_lock_irqsave(&priv->lock, flags);
901 if (priv->is_tx) {
902 priv->is_tx = 0;
903 spin_unlock_irqrestore(&priv->lock, flags);
904 dev_dbg(&priv->spi->dev, "SFD for TX\n");
905 complete(&priv->tx_complete);
906 } else {
907 spin_unlock_irqrestore(&priv->lock, flags);
908 dev_dbg(&priv->spi->dev, "SFD for RX\n");
909 }
910
911 return IRQ_HANDLED;
912}
913
914static int cc2520_hw_init(struct cc2520_private *priv)
915{
916 u8 status = 0, state = 0xff;
917 int ret;
918 int timeout = 100;
919
920 ret = cc2520_read_register(priv, CC2520_FSMSTAT1, &state);
921 if (ret)
922 goto err_ret;
923
924 if (state != STATE_IDLE)
925 return -EINVAL;
926
927 do {
928 ret = cc2520_get_status(priv, &status);
929 if (ret)
930 goto err_ret;
931
932 if (timeout-- <= 0) {
933 dev_err(&priv->spi->dev, "oscillator start failed!\n");
934 return -ETIMEDOUT;
935 }
936 udelay(1);
937 } while (!(status & CC2520_STATUS_XOSC32M_STABLE));
938
939 dev_vdbg(&priv->spi->dev, "oscillator brought up\n");
940
941 /* If the CC2520 is connected to a CC2591 amplifier, we must both
942 * configure GPIOs on the CC2520 to correctly configure the CC2591
943 * and change a couple settings of the CC2520 to work with the
944 * amplifier. See section 8 page 17 of TI application note AN065.
945 * http://www.ti.com/lit/an/swra229a/swra229a.pdf
946 */
947 if (priv->amplified) {
948 ret = cc2520_write_register(priv, CC2520_AGCCTRL1, 0x16);
949 if (ret)
950 goto err_ret;
951
952 ret = cc2520_write_register(priv, CC2520_GPIOCTRL0, 0x46);
953 if (ret)
954 goto err_ret;
955
956 ret = cc2520_write_register(priv, CC2520_GPIOCTRL5, 0x47);
957 if (ret)
958 goto err_ret;
959
960 ret = cc2520_write_register(priv, CC2520_GPIOPOLARITY, 0x1e);
961 if (ret)
962 goto err_ret;
963
964 ret = cc2520_write_register(priv, CC2520_TXCTRL, 0xc1);
965 if (ret)
966 goto err_ret;
967 } else {
968 ret = cc2520_write_register(priv, CC2520_AGCCTRL1, 0x11);
969 if (ret)
970 goto err_ret;
971 }
972
973 /* Registers default value: section 28.1 in Datasheet */
974
975 /* Set the CCA threshold to -50 dBm. This seems to have been copied
976 * from the TinyOS CC2520 driver and is much higher than the -84 dBm
977 * threshold suggested in the datasheet.
978 */
979 ret = cc2520_write_register(priv, CC2520_CCACTRL0, 0x1A);
980 if (ret)
981 goto err_ret;
982
983 ret = cc2520_write_register(priv, CC2520_MDMCTRL0, 0x85);
984 if (ret)
985 goto err_ret;
986
987 ret = cc2520_write_register(priv, CC2520_MDMCTRL1, 0x14);
988 if (ret)
989 goto err_ret;
990
991 ret = cc2520_write_register(priv, CC2520_RXCTRL, 0x3f);
992 if (ret)
993 goto err_ret;
994
995 ret = cc2520_write_register(priv, CC2520_FSCTRL, 0x5a);
996 if (ret)
997 goto err_ret;
998
999 ret = cc2520_write_register(priv, CC2520_FSCAL1, 0x2b);
1000 if (ret)
1001 goto err_ret;
1002
1003 ret = cc2520_write_register(priv, CC2520_ADCTEST0, 0x10);
1004 if (ret)
1005 goto err_ret;
1006
1007 ret = cc2520_write_register(priv, CC2520_ADCTEST1, 0x0e);
1008 if (ret)
1009 goto err_ret;
1010
1011 ret = cc2520_write_register(priv, CC2520_ADCTEST2, 0x03);
1012 if (ret)
1013 goto err_ret;
1014
1015 /* Configure registers correctly for this driver. */
1016 ret = cc2520_write_register(priv, CC2520_FRMCTRL1,
1017 FRMCTRL1_SET_RXENMASK_ON_TX |
1018 FRMCTRL1_IGNORE_TX_UNDERF);
1019 if (ret)
1020 goto err_ret;
1021
1022 ret = cc2520_write_register(priv, CC2520_FIFOPCTRL, 127);
1023 if (ret)
1024 goto err_ret;
1025
1026 return 0;
1027
1028err_ret:
1029 return ret;
1030}
1031
1032static int cc2520_probe(struct spi_device *spi)
1033{
1034 struct cc2520_private *priv;
1035 struct gpio_desc *fifop;
1036 struct gpio_desc *cca;
1037 struct gpio_desc *sfd;
1038 struct gpio_desc *reset;
1039 struct gpio_desc *vreg;
1040 int ret;
1041
1042 priv = devm_kzalloc(&spi->dev, sizeof(*priv), GFP_KERNEL);
1043 if (!priv)
1044 return -ENOMEM;
1045
1046 spi_set_drvdata(spi, priv);
1047
1048 /* CC2591 front end for CC2520 */
1049 /* Assumption that CC2591 is not connected */
1050 priv->amplified = false;
1051 if (device_property_read_bool(&spi->dev, "amplified"))
1052 priv->amplified = true;
1053
1054 priv->spi = spi;
1055
1056 priv->buf = devm_kzalloc(&spi->dev,
1057 SPI_COMMAND_BUFFER, GFP_KERNEL);
1058 if (!priv->buf)
1059 return -ENOMEM;
1060
1061 mutex_init(&priv->buffer_mutex);
1062 INIT_WORK(&priv->fifop_irqwork, cc2520_fifop_irqwork);
1063 spin_lock_init(&priv->lock);
1064 init_completion(&priv->tx_complete);
1065
1066 /* Request all the gpio's */
1067 priv->fifo_pin = devm_gpiod_get(&spi->dev, "fifo", GPIOD_IN);
1068 if (IS_ERR(priv->fifo_pin)) {
1069 dev_err(&spi->dev, "fifo gpio is not valid\n");
1070 ret = PTR_ERR(priv->fifo_pin);
1071 goto err_hw_init;
1072 }
1073
1074 cca = devm_gpiod_get(&spi->dev, "cca", GPIOD_IN);
1075 if (IS_ERR(cca)) {
1076 dev_err(&spi->dev, "cca gpio is not valid\n");
1077 ret = PTR_ERR(cca);
1078 goto err_hw_init;
1079 }
1080
1081 fifop = devm_gpiod_get(&spi->dev, "fifop", GPIOD_IN);
1082 if (IS_ERR(fifop)) {
1083 dev_err(&spi->dev, "fifop gpio is not valid\n");
1084 ret = PTR_ERR(fifop);
1085 goto err_hw_init;
1086 }
1087
1088 sfd = devm_gpiod_get(&spi->dev, "sfd", GPIOD_IN);
1089 if (IS_ERR(sfd)) {
1090 dev_err(&spi->dev, "sfd gpio is not valid\n");
1091 ret = PTR_ERR(sfd);
1092 goto err_hw_init;
1093 }
1094
1095 reset = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_LOW);
1096 if (IS_ERR(reset)) {
1097 dev_err(&spi->dev, "reset gpio is not valid\n");
1098 ret = PTR_ERR(reset);
1099 goto err_hw_init;
1100 }
1101
1102 vreg = devm_gpiod_get(&spi->dev, "vreg", GPIOD_OUT_LOW);
1103 if (IS_ERR(vreg)) {
1104 dev_err(&spi->dev, "vreg gpio is not valid\n");
1105 ret = PTR_ERR(vreg);
1106 goto err_hw_init;
1107 }
1108
1109 gpiod_set_value(vreg, HIGH);
1110 usleep_range(100, 150);
1111
1112 gpiod_set_value(reset, HIGH);
1113 usleep_range(200, 250);
1114
1115 ret = cc2520_hw_init(priv);
1116 if (ret)
1117 goto err_hw_init;
1118
1119 /* Set up fifop interrupt */
1120 ret = devm_request_irq(&spi->dev,
1121 gpiod_to_irq(fifop),
1122 cc2520_fifop_isr,
1123 IRQF_TRIGGER_RISING,
1124 dev_name(&spi->dev),
1125 priv);
1126 if (ret) {
1127 dev_err(&spi->dev, "could not get fifop irq\n");
1128 goto err_hw_init;
1129 }
1130
1131 /* Set up sfd interrupt */
1132 ret = devm_request_irq(&spi->dev,
1133 gpiod_to_irq(sfd),
1134 cc2520_sfd_isr,
1135 IRQF_TRIGGER_FALLING,
1136 dev_name(&spi->dev),
1137 priv);
1138 if (ret) {
1139 dev_err(&spi->dev, "could not get sfd irq\n");
1140 goto err_hw_init;
1141 }
1142
1143 ret = cc2520_register(priv);
1144 if (ret)
1145 goto err_hw_init;
1146
1147 return 0;
1148
1149err_hw_init:
1150 mutex_destroy(&priv->buffer_mutex);
1151 flush_work(&priv->fifop_irqwork);
1152 return ret;
1153}
1154
1155static void cc2520_remove(struct spi_device *spi)
1156{
1157 struct cc2520_private *priv = spi_get_drvdata(spi);
1158
1159 mutex_destroy(&priv->buffer_mutex);
1160 flush_work(&priv->fifop_irqwork);
1161
1162 ieee802154_unregister_hw(priv->hw);
1163 ieee802154_free_hw(priv->hw);
1164}
1165
1166static const struct spi_device_id cc2520_ids[] = {
1167 {"cc2520", },
1168 {},
1169};
1170MODULE_DEVICE_TABLE(spi, cc2520_ids);
1171
1172static const struct of_device_id cc2520_of_ids[] = {
1173 {.compatible = "ti,cc2520", },
1174 {},
1175};
1176MODULE_DEVICE_TABLE(of, cc2520_of_ids);
1177
1178/* SPI driver structure */
1179static struct spi_driver cc2520_driver = {
1180 .driver = {
1181 .name = "cc2520",
1182 .of_match_table = cc2520_of_ids,
1183 },
1184 .id_table = cc2520_ids,
1185 .probe = cc2520_probe,
1186 .remove = cc2520_remove,
1187};
1188module_spi_driver(cc2520_driver);
1189
1190MODULE_AUTHOR("Varka Bhadram <varkab@cdac.in>");
1191MODULE_DESCRIPTION("CC2520 Transceiver Driver");
1192MODULE_LICENSE("GPL v2");
1/* Driver for TI CC2520 802.15.4 Wireless-PAN Networking controller
2 *
3 * Copyright (C) 2014 Varka Bhadram <varkab@cdac.in>
4 * Md.Jamal Mohiuddin <mjmohiuddin@cdac.in>
5 * P Sowjanya <sowjanyap@cdac.in>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 */
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/gpio.h>
16#include <linux/delay.h>
17#include <linux/spi/spi.h>
18#include <linux/spi/cc2520.h>
19#include <linux/workqueue.h>
20#include <linux/interrupt.h>
21#include <linux/skbuff.h>
22#include <linux/of_gpio.h>
23#include <linux/ieee802154.h>
24#include <linux/crc-ccitt.h>
25#include <asm/unaligned.h>
26
27#include <net/mac802154.h>
28#include <net/cfg802154.h>
29
30#define SPI_COMMAND_BUFFER 3
31#define HIGH 1
32#define LOW 0
33#define STATE_IDLE 0
34#define RSSI_VALID 0
35#define RSSI_OFFSET 78
36
37#define CC2520_RAM_SIZE 640
38#define CC2520_FIFO_SIZE 128
39
40#define CC2520RAM_TXFIFO 0x100
41#define CC2520RAM_RXFIFO 0x180
42#define CC2520RAM_IEEEADDR 0x3EA
43#define CC2520RAM_PANID 0x3F2
44#define CC2520RAM_SHORTADDR 0x3F4
45
46#define CC2520_FREG_MASK 0x3F
47
48/* status byte values */
49#define CC2520_STATUS_XOSC32M_STABLE BIT(7)
50#define CC2520_STATUS_RSSI_VALID BIT(6)
51#define CC2520_STATUS_TX_UNDERFLOW BIT(3)
52
53/* IEEE-802.15.4 defined constants (2.4 GHz logical channels) */
54#define CC2520_MINCHANNEL 11
55#define CC2520_MAXCHANNEL 26
56#define CC2520_CHANNEL_SPACING 5
57
58/* command strobes */
59#define CC2520_CMD_SNOP 0x00
60#define CC2520_CMD_IBUFLD 0x02
61#define CC2520_CMD_SIBUFEX 0x03
62#define CC2520_CMD_SSAMPLECCA 0x04
63#define CC2520_CMD_SRES 0x0f
64#define CC2520_CMD_MEMORY_MASK 0x0f
65#define CC2520_CMD_MEMORY_READ 0x10
66#define CC2520_CMD_MEMORY_WRITE 0x20
67#define CC2520_CMD_RXBUF 0x30
68#define CC2520_CMD_RXBUFCP 0x38
69#define CC2520_CMD_RXBUFMOV 0x32
70#define CC2520_CMD_TXBUF 0x3A
71#define CC2520_CMD_TXBUFCP 0x3E
72#define CC2520_CMD_RANDOM 0x3C
73#define CC2520_CMD_SXOSCON 0x40
74#define CC2520_CMD_STXCAL 0x41
75#define CC2520_CMD_SRXON 0x42
76#define CC2520_CMD_STXON 0x43
77#define CC2520_CMD_STXONCCA 0x44
78#define CC2520_CMD_SRFOFF 0x45
79#define CC2520_CMD_SXOSCOFF 0x46
80#define CC2520_CMD_SFLUSHRX 0x47
81#define CC2520_CMD_SFLUSHTX 0x48
82#define CC2520_CMD_SACK 0x49
83#define CC2520_CMD_SACKPEND 0x4A
84#define CC2520_CMD_SNACK 0x4B
85#define CC2520_CMD_SRXMASKBITSET 0x4C
86#define CC2520_CMD_SRXMASKBITCLR 0x4D
87#define CC2520_CMD_RXMASKAND 0x4E
88#define CC2520_CMD_RXMASKOR 0x4F
89#define CC2520_CMD_MEMCP 0x50
90#define CC2520_CMD_MEMCPR 0x52
91#define CC2520_CMD_MEMXCP 0x54
92#define CC2520_CMD_MEMXWR 0x56
93#define CC2520_CMD_BCLR 0x58
94#define CC2520_CMD_BSET 0x59
95#define CC2520_CMD_CTR_UCTR 0x60
96#define CC2520_CMD_CBCMAC 0x64
97#define CC2520_CMD_UCBCMAC 0x66
98#define CC2520_CMD_CCM 0x68
99#define CC2520_CMD_UCCM 0x6A
100#define CC2520_CMD_ECB 0x70
101#define CC2520_CMD_ECBO 0x72
102#define CC2520_CMD_ECBX 0x74
103#define CC2520_CMD_INC 0x78
104#define CC2520_CMD_ABORT 0x7F
105#define CC2520_CMD_REGISTER_READ 0x80
106#define CC2520_CMD_REGISTER_WRITE 0xC0
107
108/* status registers */
109#define CC2520_CHIPID 0x40
110#define CC2520_VERSION 0x42
111#define CC2520_EXTCLOCK 0x44
112#define CC2520_MDMCTRL0 0x46
113#define CC2520_MDMCTRL1 0x47
114#define CC2520_FREQEST 0x48
115#define CC2520_RXCTRL 0x4A
116#define CC2520_FSCTRL 0x4C
117#define CC2520_FSCAL0 0x4E
118#define CC2520_FSCAL1 0x4F
119#define CC2520_FSCAL2 0x50
120#define CC2520_FSCAL3 0x51
121#define CC2520_AGCCTRL0 0x52
122#define CC2520_AGCCTRL1 0x53
123#define CC2520_AGCCTRL2 0x54
124#define CC2520_AGCCTRL3 0x55
125#define CC2520_ADCTEST0 0x56
126#define CC2520_ADCTEST1 0x57
127#define CC2520_ADCTEST2 0x58
128#define CC2520_MDMTEST0 0x5A
129#define CC2520_MDMTEST1 0x5B
130#define CC2520_DACTEST0 0x5C
131#define CC2520_DACTEST1 0x5D
132#define CC2520_ATEST 0x5E
133#define CC2520_DACTEST2 0x5F
134#define CC2520_PTEST0 0x60
135#define CC2520_PTEST1 0x61
136#define CC2520_RESERVED 0x62
137#define CC2520_DPUBIST 0x7A
138#define CC2520_ACTBIST 0x7C
139#define CC2520_RAMBIST 0x7E
140
141/* frame registers */
142#define CC2520_FRMFILT0 0x00
143#define CC2520_FRMFILT1 0x01
144#define CC2520_SRCMATCH 0x02
145#define CC2520_SRCSHORTEN0 0x04
146#define CC2520_SRCSHORTEN1 0x05
147#define CC2520_SRCSHORTEN2 0x06
148#define CC2520_SRCEXTEN0 0x08
149#define CC2520_SRCEXTEN1 0x09
150#define CC2520_SRCEXTEN2 0x0A
151#define CC2520_FRMCTRL0 0x0C
152#define CC2520_FRMCTRL1 0x0D
153#define CC2520_RXENABLE0 0x0E
154#define CC2520_RXENABLE1 0x0F
155#define CC2520_EXCFLAG0 0x10
156#define CC2520_EXCFLAG1 0x11
157#define CC2520_EXCFLAG2 0x12
158#define CC2520_EXCMASKA0 0x14
159#define CC2520_EXCMASKA1 0x15
160#define CC2520_EXCMASKA2 0x16
161#define CC2520_EXCMASKB0 0x18
162#define CC2520_EXCMASKB1 0x19
163#define CC2520_EXCMASKB2 0x1A
164#define CC2520_EXCBINDX0 0x1C
165#define CC2520_EXCBINDX1 0x1D
166#define CC2520_EXCBINDY0 0x1E
167#define CC2520_EXCBINDY1 0x1F
168#define CC2520_GPIOCTRL0 0x20
169#define CC2520_GPIOCTRL1 0x21
170#define CC2520_GPIOCTRL2 0x22
171#define CC2520_GPIOCTRL3 0x23
172#define CC2520_GPIOCTRL4 0x24
173#define CC2520_GPIOCTRL5 0x25
174#define CC2520_GPIOPOLARITY 0x26
175#define CC2520_GPIOCTRL 0x28
176#define CC2520_DPUCON 0x2A
177#define CC2520_DPUSTAT 0x2C
178#define CC2520_FREQCTRL 0x2E
179#define CC2520_FREQTUNE 0x2F
180#define CC2520_TXPOWER 0x30
181#define CC2520_TXCTRL 0x31
182#define CC2520_FSMSTAT0 0x32
183#define CC2520_FSMSTAT1 0x33
184#define CC2520_FIFOPCTRL 0x34
185#define CC2520_FSMCTRL 0x35
186#define CC2520_CCACTRL0 0x36
187#define CC2520_CCACTRL1 0x37
188#define CC2520_RSSI 0x38
189#define CC2520_RSSISTAT 0x39
190#define CC2520_RXFIRST 0x3C
191#define CC2520_RXFIFOCNT 0x3E
192#define CC2520_TXFIFOCNT 0x3F
193
194/* CC2520_FRMFILT0 */
195#define FRMFILT0_FRAME_FILTER_EN BIT(0)
196#define FRMFILT0_PAN_COORDINATOR BIT(1)
197
198/* CC2520_FRMCTRL0 */
199#define FRMCTRL0_AUTOACK BIT(5)
200#define FRMCTRL0_AUTOCRC BIT(6)
201
202/* CC2520_FRMCTRL1 */
203#define FRMCTRL1_SET_RXENMASK_ON_TX BIT(0)
204#define FRMCTRL1_IGNORE_TX_UNDERF BIT(1)
205
206/* Driver private information */
207struct cc2520_private {
208 struct spi_device *spi; /* SPI device structure */
209 struct ieee802154_hw *hw; /* IEEE-802.15.4 device */
210 u8 *buf; /* SPI TX/Rx data buffer */
211 struct mutex buffer_mutex; /* SPI buffer mutex */
212 bool is_tx; /* Flag for sync b/w Tx and Rx */
213 bool amplified; /* Flag for CC2591 */
214 int fifo_pin; /* FIFO GPIO pin number */
215 struct work_struct fifop_irqwork;/* Workqueue for FIFOP */
216 spinlock_t lock; /* Lock for is_tx*/
217 struct completion tx_complete; /* Work completion for Tx */
218 bool promiscuous; /* Flag for promiscuous mode */
219};
220
221/* Generic Functions */
222static int
223cc2520_cmd_strobe(struct cc2520_private *priv, u8 cmd)
224{
225 int ret;
226 u8 status = 0xff;
227 struct spi_message msg;
228 struct spi_transfer xfer = {
229 .len = 0,
230 .tx_buf = priv->buf,
231 .rx_buf = priv->buf,
232 };
233
234 spi_message_init(&msg);
235 spi_message_add_tail(&xfer, &msg);
236
237 mutex_lock(&priv->buffer_mutex);
238 priv->buf[xfer.len++] = cmd;
239 dev_vdbg(&priv->spi->dev,
240 "command strobe buf[0] = %02x\n",
241 priv->buf[0]);
242
243 ret = spi_sync(priv->spi, &msg);
244 if (!ret)
245 status = priv->buf[0];
246 dev_vdbg(&priv->spi->dev,
247 "buf[0] = %02x\n", priv->buf[0]);
248 mutex_unlock(&priv->buffer_mutex);
249
250 return ret;
251}
252
253static int
254cc2520_get_status(struct cc2520_private *priv, u8 *status)
255{
256 int ret;
257 struct spi_message msg;
258 struct spi_transfer xfer = {
259 .len = 0,
260 .tx_buf = priv->buf,
261 .rx_buf = priv->buf,
262 };
263
264 spi_message_init(&msg);
265 spi_message_add_tail(&xfer, &msg);
266
267 mutex_lock(&priv->buffer_mutex);
268 priv->buf[xfer.len++] = CC2520_CMD_SNOP;
269 dev_vdbg(&priv->spi->dev,
270 "get status command buf[0] = %02x\n", priv->buf[0]);
271
272 ret = spi_sync(priv->spi, &msg);
273 if (!ret)
274 *status = priv->buf[0];
275 dev_vdbg(&priv->spi->dev,
276 "buf[0] = %02x\n", priv->buf[0]);
277 mutex_unlock(&priv->buffer_mutex);
278
279 return ret;
280}
281
282static int
283cc2520_write_register(struct cc2520_private *priv, u8 reg, u8 value)
284{
285 int status;
286 struct spi_message msg;
287 struct spi_transfer xfer = {
288 .len = 0,
289 .tx_buf = priv->buf,
290 .rx_buf = priv->buf,
291 };
292
293 spi_message_init(&msg);
294 spi_message_add_tail(&xfer, &msg);
295
296 mutex_lock(&priv->buffer_mutex);
297
298 if (reg <= CC2520_FREG_MASK) {
299 priv->buf[xfer.len++] = CC2520_CMD_REGISTER_WRITE | reg;
300 priv->buf[xfer.len++] = value;
301 } else {
302 priv->buf[xfer.len++] = CC2520_CMD_MEMORY_WRITE;
303 priv->buf[xfer.len++] = reg;
304 priv->buf[xfer.len++] = value;
305 }
306 status = spi_sync(priv->spi, &msg);
307 if (msg.status)
308 status = msg.status;
309
310 mutex_unlock(&priv->buffer_mutex);
311
312 return status;
313}
314
315static int
316cc2520_write_ram(struct cc2520_private *priv, u16 reg, u8 len, u8 *data)
317{
318 int status;
319 struct spi_message msg;
320 struct spi_transfer xfer_head = {
321 .len = 0,
322 .tx_buf = priv->buf,
323 .rx_buf = priv->buf,
324 };
325
326 struct spi_transfer xfer_buf = {
327 .len = len,
328 .tx_buf = data,
329 };
330
331 mutex_lock(&priv->buffer_mutex);
332 priv->buf[xfer_head.len++] = (CC2520_CMD_MEMORY_WRITE |
333 ((reg >> 8) & 0xff));
334 priv->buf[xfer_head.len++] = reg & 0xff;
335
336 spi_message_init(&msg);
337 spi_message_add_tail(&xfer_head, &msg);
338 spi_message_add_tail(&xfer_buf, &msg);
339
340 status = spi_sync(priv->spi, &msg);
341 dev_dbg(&priv->spi->dev, "spi status = %d\n", status);
342 if (msg.status)
343 status = msg.status;
344
345 mutex_unlock(&priv->buffer_mutex);
346 return status;
347}
348
349static int
350cc2520_read_register(struct cc2520_private *priv, u8 reg, u8 *data)
351{
352 int status;
353 struct spi_message msg;
354 struct spi_transfer xfer1 = {
355 .len = 0,
356 .tx_buf = priv->buf,
357 .rx_buf = priv->buf,
358 };
359
360 struct spi_transfer xfer2 = {
361 .len = 1,
362 .rx_buf = data,
363 };
364
365 spi_message_init(&msg);
366 spi_message_add_tail(&xfer1, &msg);
367 spi_message_add_tail(&xfer2, &msg);
368
369 mutex_lock(&priv->buffer_mutex);
370 priv->buf[xfer1.len++] = CC2520_CMD_MEMORY_READ;
371 priv->buf[xfer1.len++] = reg;
372
373 status = spi_sync(priv->spi, &msg);
374 dev_dbg(&priv->spi->dev,
375 "spi status = %d\n", status);
376 if (msg.status)
377 status = msg.status;
378
379 mutex_unlock(&priv->buffer_mutex);
380
381 return status;
382}
383
384static int
385cc2520_write_txfifo(struct cc2520_private *priv, u8 pkt_len, u8 *data, u8 len)
386{
387 int status;
388
389 /* length byte must include FCS even
390 * if it is calculated in the hardware
391 */
392 int len_byte = pkt_len;
393
394 struct spi_message msg;
395
396 struct spi_transfer xfer_head = {
397 .len = 0,
398 .tx_buf = priv->buf,
399 .rx_buf = priv->buf,
400 };
401 struct spi_transfer xfer_len = {
402 .len = 1,
403 .tx_buf = &len_byte,
404 };
405 struct spi_transfer xfer_buf = {
406 .len = len,
407 .tx_buf = data,
408 };
409
410 spi_message_init(&msg);
411 spi_message_add_tail(&xfer_head, &msg);
412 spi_message_add_tail(&xfer_len, &msg);
413 spi_message_add_tail(&xfer_buf, &msg);
414
415 mutex_lock(&priv->buffer_mutex);
416 priv->buf[xfer_head.len++] = CC2520_CMD_TXBUF;
417 dev_vdbg(&priv->spi->dev,
418 "TX_FIFO cmd buf[0] = %02x\n", priv->buf[0]);
419
420 status = spi_sync(priv->spi, &msg);
421 dev_vdbg(&priv->spi->dev, "status = %d\n", status);
422 if (msg.status)
423 status = msg.status;
424 dev_vdbg(&priv->spi->dev, "status = %d\n", status);
425 dev_vdbg(&priv->spi->dev, "buf[0] = %02x\n", priv->buf[0]);
426 mutex_unlock(&priv->buffer_mutex);
427
428 return status;
429}
430
431static int
432cc2520_read_rxfifo(struct cc2520_private *priv, u8 *data, u8 len)
433{
434 int status;
435 struct spi_message msg;
436
437 struct spi_transfer xfer_head = {
438 .len = 0,
439 .tx_buf = priv->buf,
440 .rx_buf = priv->buf,
441 };
442 struct spi_transfer xfer_buf = {
443 .len = len,
444 .rx_buf = data,
445 };
446
447 spi_message_init(&msg);
448 spi_message_add_tail(&xfer_head, &msg);
449 spi_message_add_tail(&xfer_buf, &msg);
450
451 mutex_lock(&priv->buffer_mutex);
452 priv->buf[xfer_head.len++] = CC2520_CMD_RXBUF;
453
454 dev_vdbg(&priv->spi->dev, "read rxfifo buf[0] = %02x\n", priv->buf[0]);
455 dev_vdbg(&priv->spi->dev, "buf[1] = %02x\n", priv->buf[1]);
456
457 status = spi_sync(priv->spi, &msg);
458 dev_vdbg(&priv->spi->dev, "status = %d\n", status);
459 if (msg.status)
460 status = msg.status;
461 dev_vdbg(&priv->spi->dev, "status = %d\n", status);
462 dev_vdbg(&priv->spi->dev,
463 "return status buf[0] = %02x\n", priv->buf[0]);
464 dev_vdbg(&priv->spi->dev, "length buf[1] = %02x\n", priv->buf[1]);
465
466 mutex_unlock(&priv->buffer_mutex);
467
468 return status;
469}
470
471static int cc2520_start(struct ieee802154_hw *hw)
472{
473 return cc2520_cmd_strobe(hw->priv, CC2520_CMD_SRXON);
474}
475
476static void cc2520_stop(struct ieee802154_hw *hw)
477{
478 cc2520_cmd_strobe(hw->priv, CC2520_CMD_SRFOFF);
479}
480
481static int
482cc2520_tx(struct ieee802154_hw *hw, struct sk_buff *skb)
483{
484 struct cc2520_private *priv = hw->priv;
485 unsigned long flags;
486 int rc;
487 u8 status = 0;
488 u8 pkt_len;
489
490 /* In promiscuous mode we disable AUTOCRC so we can get the raw CRC
491 * values on RX. This means we need to manually add the CRC on TX.
492 */
493 if (priv->promiscuous) {
494 u16 crc = crc_ccitt(0, skb->data, skb->len);
495
496 put_unaligned_le16(crc, skb_put(skb, 2));
497 pkt_len = skb->len;
498 } else {
499 pkt_len = skb->len + 2;
500 }
501
502 rc = cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHTX);
503 if (rc)
504 goto err_tx;
505
506 rc = cc2520_write_txfifo(priv, pkt_len, skb->data, skb->len);
507 if (rc)
508 goto err_tx;
509
510 rc = cc2520_get_status(priv, &status);
511 if (rc)
512 goto err_tx;
513
514 if (status & CC2520_STATUS_TX_UNDERFLOW) {
515 dev_err(&priv->spi->dev, "cc2520 tx underflow exception\n");
516 goto err_tx;
517 }
518
519 spin_lock_irqsave(&priv->lock, flags);
520 WARN_ON(priv->is_tx);
521 priv->is_tx = 1;
522 spin_unlock_irqrestore(&priv->lock, flags);
523
524 rc = cc2520_cmd_strobe(priv, CC2520_CMD_STXONCCA);
525 if (rc)
526 goto err;
527
528 rc = wait_for_completion_interruptible(&priv->tx_complete);
529 if (rc < 0)
530 goto err;
531
532 cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHTX);
533 cc2520_cmd_strobe(priv, CC2520_CMD_SRXON);
534
535 return rc;
536err:
537 spin_lock_irqsave(&priv->lock, flags);
538 priv->is_tx = 0;
539 spin_unlock_irqrestore(&priv->lock, flags);
540err_tx:
541 return rc;
542}
543
544static int cc2520_rx(struct cc2520_private *priv)
545{
546 u8 len = 0, lqi = 0, bytes = 1;
547 struct sk_buff *skb;
548
549 /* Read single length byte from the radio. */
550 cc2520_read_rxfifo(priv, &len, bytes);
551
552 if (!ieee802154_is_valid_psdu_len(len)) {
553 /* Corrupted frame received, clear frame buffer by
554 * reading entire buffer.
555 */
556 dev_dbg(&priv->spi->dev, "corrupted frame received\n");
557 len = IEEE802154_MTU;
558 }
559
560 skb = dev_alloc_skb(len);
561 if (!skb)
562 return -ENOMEM;
563
564 if (cc2520_read_rxfifo(priv, skb_put(skb, len), len)) {
565 dev_dbg(&priv->spi->dev, "frame reception failed\n");
566 kfree_skb(skb);
567 return -EINVAL;
568 }
569
570 /* In promiscuous mode, we configure the radio to include the
571 * CRC (AUTOCRC==0) and we pass on the packet unconditionally. If not
572 * in promiscuous mode, we check the CRC here, but leave the
573 * RSSI/LQI/CRC_OK bytes as they will get removed in the mac layer.
574 */
575 if (!priv->promiscuous) {
576 bool crc_ok;
577
578 /* Check if the CRC is valid. With AUTOCRC set, the most
579 * significant bit of the last byte returned from the CC2520
580 * is CRC_OK flag. See section 20.3.4 of the datasheet.
581 */
582 crc_ok = skb->data[len - 1] & BIT(7);
583
584 /* If we failed CRC drop the packet in the driver layer. */
585 if (!crc_ok) {
586 dev_dbg(&priv->spi->dev, "CRC check failed\n");
587 kfree_skb(skb);
588 return -EINVAL;
589 }
590
591 /* To calculate LQI, the lower 7 bits of the last byte (the
592 * correlation value provided by the radio) must be scaled to
593 * the range 0-255. According to section 20.6, the correlation
594 * value ranges from 50-110. Ideally this would be calibrated
595 * per hardware design, but we use roughly the datasheet values
596 * to get close enough while avoiding floating point.
597 */
598 lqi = skb->data[len - 1] & 0x7f;
599 if (lqi < 50)
600 lqi = 50;
601 else if (lqi > 113)
602 lqi = 113;
603 lqi = (lqi - 50) * 4;
604 }
605
606 ieee802154_rx_irqsafe(priv->hw, skb, lqi);
607
608 dev_vdbg(&priv->spi->dev, "RXFIFO: %x %x\n", len, lqi);
609
610 return 0;
611}
612
613static int
614cc2520_ed(struct ieee802154_hw *hw, u8 *level)
615{
616 struct cc2520_private *priv = hw->priv;
617 u8 status = 0xff;
618 u8 rssi;
619 int ret;
620
621 ret = cc2520_read_register(priv, CC2520_RSSISTAT, &status);
622 if (ret)
623 return ret;
624
625 if (status != RSSI_VALID)
626 return -EINVAL;
627
628 ret = cc2520_read_register(priv, CC2520_RSSI, &rssi);
629 if (ret)
630 return ret;
631
632 /* level = RSSI(rssi) - OFFSET [dBm] : offset is 76dBm */
633 *level = rssi - RSSI_OFFSET;
634
635 return 0;
636}
637
638static int
639cc2520_set_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
640{
641 struct cc2520_private *priv = hw->priv;
642 int ret;
643
644 dev_dbg(&priv->spi->dev, "trying to set channel\n");
645
646 WARN_ON(page != 0);
647 WARN_ON(channel < CC2520_MINCHANNEL);
648 WARN_ON(channel > CC2520_MAXCHANNEL);
649
650 ret = cc2520_write_register(priv, CC2520_FREQCTRL,
651 11 + 5 * (channel - 11));
652
653 return ret;
654}
655
656static int
657cc2520_filter(struct ieee802154_hw *hw,
658 struct ieee802154_hw_addr_filt *filt, unsigned long changed)
659{
660 struct cc2520_private *priv = hw->priv;
661 int ret = 0;
662
663 if (changed & IEEE802154_AFILT_PANID_CHANGED) {
664 u16 panid = le16_to_cpu(filt->pan_id);
665
666 dev_vdbg(&priv->spi->dev, "%s called for pan id\n", __func__);
667 ret = cc2520_write_ram(priv, CC2520RAM_PANID,
668 sizeof(panid), (u8 *)&panid);
669 }
670
671 if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
672 dev_vdbg(&priv->spi->dev,
673 "%s called for IEEE addr\n", __func__);
674 ret = cc2520_write_ram(priv, CC2520RAM_IEEEADDR,
675 sizeof(filt->ieee_addr),
676 (u8 *)&filt->ieee_addr);
677 }
678
679 if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
680 u16 addr = le16_to_cpu(filt->short_addr);
681
682 dev_vdbg(&priv->spi->dev, "%s called for saddr\n", __func__);
683 ret = cc2520_write_ram(priv, CC2520RAM_SHORTADDR,
684 sizeof(addr), (u8 *)&addr);
685 }
686
687 if (changed & IEEE802154_AFILT_PANC_CHANGED) {
688 u8 frmfilt0;
689
690 dev_vdbg(&priv->spi->dev,
691 "%s called for panc change\n", __func__);
692
693 cc2520_read_register(priv, CC2520_FRMFILT0, &frmfilt0);
694
695 if (filt->pan_coord)
696 frmfilt0 |= FRMFILT0_PAN_COORDINATOR;
697 else
698 frmfilt0 &= ~FRMFILT0_PAN_COORDINATOR;
699
700 ret = cc2520_write_register(priv, CC2520_FRMFILT0, frmfilt0);
701 }
702
703 return ret;
704}
705
706static inline int cc2520_set_tx_power(struct cc2520_private *priv, s32 mbm)
707{
708 u8 power;
709
710 switch (mbm) {
711 case 500:
712 power = 0xF7;
713 break;
714 case 300:
715 power = 0xF2;
716 break;
717 case 200:
718 power = 0xAB;
719 break;
720 case 100:
721 power = 0x13;
722 break;
723 case 0:
724 power = 0x32;
725 break;
726 case -200:
727 power = 0x81;
728 break;
729 case -400:
730 power = 0x88;
731 break;
732 case -700:
733 power = 0x2C;
734 break;
735 case -1800:
736 power = 0x03;
737 break;
738 default:
739 return -EINVAL;
740 }
741
742 return cc2520_write_register(priv, CC2520_TXPOWER, power);
743}
744
745static inline int cc2520_cc2591_set_tx_power(struct cc2520_private *priv,
746 s32 mbm)
747{
748 u8 power;
749
750 switch (mbm) {
751 case 1700:
752 power = 0xF9;
753 break;
754 case 1600:
755 power = 0xF0;
756 break;
757 case 1400:
758 power = 0xA0;
759 break;
760 case 1100:
761 power = 0x2C;
762 break;
763 case -100:
764 power = 0x03;
765 break;
766 case -800:
767 power = 0x01;
768 break;
769 default:
770 return -EINVAL;
771 }
772
773 return cc2520_write_register(priv, CC2520_TXPOWER, power);
774}
775
776#define CC2520_MAX_TX_POWERS 0x8
777static const s32 cc2520_powers[CC2520_MAX_TX_POWERS + 1] = {
778 500, 300, 200, 100, 0, -200, -400, -700, -1800,
779};
780
781#define CC2520_CC2591_MAX_TX_POWERS 0x5
782static const s32 cc2520_cc2591_powers[CC2520_CC2591_MAX_TX_POWERS + 1] = {
783 1700, 1600, 1400, 1100, -100, -800,
784};
785
786static int
787cc2520_set_txpower(struct ieee802154_hw *hw, s32 mbm)
788{
789 struct cc2520_private *priv = hw->priv;
790
791 if (!priv->amplified)
792 return cc2520_set_tx_power(priv, mbm);
793
794 return cc2520_cc2591_set_tx_power(priv, mbm);
795}
796
797static int
798cc2520_set_promiscuous_mode(struct ieee802154_hw *hw, bool on)
799{
800 struct cc2520_private *priv = hw->priv;
801 u8 frmfilt0;
802
803 dev_dbg(&priv->spi->dev, "%s : mode %d\n", __func__, on);
804
805 priv->promiscuous = on;
806
807 cc2520_read_register(priv, CC2520_FRMFILT0, &frmfilt0);
808
809 if (on) {
810 /* Disable automatic ACK, automatic CRC, and frame filtering. */
811 cc2520_write_register(priv, CC2520_FRMCTRL0, 0);
812 frmfilt0 &= ~FRMFILT0_FRAME_FILTER_EN;
813 } else {
814 cc2520_write_register(priv, CC2520_FRMCTRL0, FRMCTRL0_AUTOACK |
815 FRMCTRL0_AUTOCRC);
816 frmfilt0 |= FRMFILT0_FRAME_FILTER_EN;
817 }
818 return cc2520_write_register(priv, CC2520_FRMFILT0, frmfilt0);
819}
820
821static const struct ieee802154_ops cc2520_ops = {
822 .owner = THIS_MODULE,
823 .start = cc2520_start,
824 .stop = cc2520_stop,
825 .xmit_sync = cc2520_tx,
826 .ed = cc2520_ed,
827 .set_channel = cc2520_set_channel,
828 .set_hw_addr_filt = cc2520_filter,
829 .set_txpower = cc2520_set_txpower,
830 .set_promiscuous_mode = cc2520_set_promiscuous_mode,
831};
832
833static int cc2520_register(struct cc2520_private *priv)
834{
835 int ret = -ENOMEM;
836
837 priv->hw = ieee802154_alloc_hw(sizeof(*priv), &cc2520_ops);
838 if (!priv->hw)
839 goto err_ret;
840
841 priv->hw->priv = priv;
842 priv->hw->parent = &priv->spi->dev;
843 priv->hw->extra_tx_headroom = 0;
844 ieee802154_random_extended_addr(&priv->hw->phy->perm_extended_addr);
845
846 /* We do support only 2.4 Ghz */
847 priv->hw->phy->supported.channels[0] = 0x7FFF800;
848 priv->hw->flags = IEEE802154_HW_TX_OMIT_CKSUM | IEEE802154_HW_AFILT |
849 IEEE802154_HW_PROMISCUOUS;
850
851 priv->hw->phy->flags = WPAN_PHY_FLAG_TXPOWER;
852
853 if (!priv->amplified) {
854 priv->hw->phy->supported.tx_powers = cc2520_powers;
855 priv->hw->phy->supported.tx_powers_size = ARRAY_SIZE(cc2520_powers);
856 priv->hw->phy->transmit_power = priv->hw->phy->supported.tx_powers[4];
857 } else {
858 priv->hw->phy->supported.tx_powers = cc2520_cc2591_powers;
859 priv->hw->phy->supported.tx_powers_size = ARRAY_SIZE(cc2520_cc2591_powers);
860 priv->hw->phy->transmit_power = priv->hw->phy->supported.tx_powers[0];
861 }
862
863 priv->hw->phy->current_channel = 11;
864
865 dev_vdbg(&priv->spi->dev, "registered cc2520\n");
866 ret = ieee802154_register_hw(priv->hw);
867 if (ret)
868 goto err_free_device;
869
870 return 0;
871
872err_free_device:
873 ieee802154_free_hw(priv->hw);
874err_ret:
875 return ret;
876}
877
878static void cc2520_fifop_irqwork(struct work_struct *work)
879{
880 struct cc2520_private *priv
881 = container_of(work, struct cc2520_private, fifop_irqwork);
882
883 dev_dbg(&priv->spi->dev, "fifop interrupt received\n");
884
885 if (gpio_get_value(priv->fifo_pin))
886 cc2520_rx(priv);
887 else
888 dev_dbg(&priv->spi->dev, "rxfifo overflow\n");
889
890 cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHRX);
891 cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHRX);
892}
893
894static irqreturn_t cc2520_fifop_isr(int irq, void *data)
895{
896 struct cc2520_private *priv = data;
897
898 schedule_work(&priv->fifop_irqwork);
899
900 return IRQ_HANDLED;
901}
902
903static irqreturn_t cc2520_sfd_isr(int irq, void *data)
904{
905 struct cc2520_private *priv = data;
906 unsigned long flags;
907
908 spin_lock_irqsave(&priv->lock, flags);
909 if (priv->is_tx) {
910 priv->is_tx = 0;
911 spin_unlock_irqrestore(&priv->lock, flags);
912 dev_dbg(&priv->spi->dev, "SFD for TX\n");
913 complete(&priv->tx_complete);
914 } else {
915 spin_unlock_irqrestore(&priv->lock, flags);
916 dev_dbg(&priv->spi->dev, "SFD for RX\n");
917 }
918
919 return IRQ_HANDLED;
920}
921
922static int cc2520_get_platform_data(struct spi_device *spi,
923 struct cc2520_platform_data *pdata)
924{
925 struct device_node *np = spi->dev.of_node;
926 struct cc2520_private *priv = spi_get_drvdata(spi);
927
928 if (!np) {
929 struct cc2520_platform_data *spi_pdata = spi->dev.platform_data;
930
931 if (!spi_pdata)
932 return -ENOENT;
933 *pdata = *spi_pdata;
934 priv->fifo_pin = pdata->fifo;
935 return 0;
936 }
937
938 pdata->fifo = of_get_named_gpio(np, "fifo-gpio", 0);
939 priv->fifo_pin = pdata->fifo;
940
941 pdata->fifop = of_get_named_gpio(np, "fifop-gpio", 0);
942
943 pdata->sfd = of_get_named_gpio(np, "sfd-gpio", 0);
944 pdata->cca = of_get_named_gpio(np, "cca-gpio", 0);
945 pdata->vreg = of_get_named_gpio(np, "vreg-gpio", 0);
946 pdata->reset = of_get_named_gpio(np, "reset-gpio", 0);
947
948 /* CC2591 front end for CC2520 */
949 if (of_property_read_bool(np, "amplified"))
950 priv->amplified = true;
951
952 return 0;
953}
954
955static int cc2520_hw_init(struct cc2520_private *priv)
956{
957 u8 status = 0, state = 0xff;
958 int ret;
959 int timeout = 100;
960 struct cc2520_platform_data pdata;
961
962 ret = cc2520_get_platform_data(priv->spi, &pdata);
963 if (ret)
964 goto err_ret;
965
966 ret = cc2520_read_register(priv, CC2520_FSMSTAT1, &state);
967 if (ret)
968 goto err_ret;
969
970 if (state != STATE_IDLE)
971 return -EINVAL;
972
973 do {
974 ret = cc2520_get_status(priv, &status);
975 if (ret)
976 goto err_ret;
977
978 if (timeout-- <= 0) {
979 dev_err(&priv->spi->dev, "oscillator start failed!\n");
980 return ret;
981 }
982 udelay(1);
983 } while (!(status & CC2520_STATUS_XOSC32M_STABLE));
984
985 dev_vdbg(&priv->spi->dev, "oscillator brought up\n");
986
987 /* If the CC2520 is connected to a CC2591 amplifier, we must both
988 * configure GPIOs on the CC2520 to correctly configure the CC2591
989 * and change a couple settings of the CC2520 to work with the
990 * amplifier. See section 8 page 17 of TI application note AN065.
991 * http://www.ti.com/lit/an/swra229a/swra229a.pdf
992 */
993 if (priv->amplified) {
994 ret = cc2520_write_register(priv, CC2520_AGCCTRL1, 0x16);
995 if (ret)
996 goto err_ret;
997
998 ret = cc2520_write_register(priv, CC2520_GPIOCTRL0, 0x46);
999 if (ret)
1000 goto err_ret;
1001
1002 ret = cc2520_write_register(priv, CC2520_GPIOCTRL5, 0x47);
1003 if (ret)
1004 goto err_ret;
1005
1006 ret = cc2520_write_register(priv, CC2520_GPIOPOLARITY, 0x1e);
1007 if (ret)
1008 goto err_ret;
1009
1010 ret = cc2520_write_register(priv, CC2520_TXCTRL, 0xc1);
1011 if (ret)
1012 goto err_ret;
1013 } else {
1014 ret = cc2520_write_register(priv, CC2520_AGCCTRL1, 0x11);
1015 if (ret)
1016 goto err_ret;
1017 }
1018
1019 /* Registers default value: section 28.1 in Datasheet */
1020
1021 /* Set the CCA threshold to -50 dBm. This seems to have been copied
1022 * from the TinyOS CC2520 driver and is much higher than the -84 dBm
1023 * threshold suggested in the datasheet.
1024 */
1025 ret = cc2520_write_register(priv, CC2520_CCACTRL0, 0x1A);
1026 if (ret)
1027 goto err_ret;
1028
1029 ret = cc2520_write_register(priv, CC2520_MDMCTRL0, 0x85);
1030 if (ret)
1031 goto err_ret;
1032
1033 ret = cc2520_write_register(priv, CC2520_MDMCTRL1, 0x14);
1034 if (ret)
1035 goto err_ret;
1036
1037 ret = cc2520_write_register(priv, CC2520_RXCTRL, 0x3f);
1038 if (ret)
1039 goto err_ret;
1040
1041 ret = cc2520_write_register(priv, CC2520_FSCTRL, 0x5a);
1042 if (ret)
1043 goto err_ret;
1044
1045 ret = cc2520_write_register(priv, CC2520_FSCAL1, 0x2b);
1046 if (ret)
1047 goto err_ret;
1048
1049 ret = cc2520_write_register(priv, CC2520_ADCTEST0, 0x10);
1050 if (ret)
1051 goto err_ret;
1052
1053 ret = cc2520_write_register(priv, CC2520_ADCTEST1, 0x0e);
1054 if (ret)
1055 goto err_ret;
1056
1057 ret = cc2520_write_register(priv, CC2520_ADCTEST2, 0x03);
1058 if (ret)
1059 goto err_ret;
1060
1061 /* Configure registers correctly for this driver. */
1062 ret = cc2520_write_register(priv, CC2520_FRMCTRL1,
1063 FRMCTRL1_SET_RXENMASK_ON_TX |
1064 FRMCTRL1_IGNORE_TX_UNDERF);
1065 if (ret)
1066 goto err_ret;
1067
1068 ret = cc2520_write_register(priv, CC2520_FIFOPCTRL, 127);
1069 if (ret)
1070 goto err_ret;
1071
1072 return 0;
1073
1074err_ret:
1075 return ret;
1076}
1077
1078static int cc2520_probe(struct spi_device *spi)
1079{
1080 struct cc2520_private *priv;
1081 struct cc2520_platform_data pdata;
1082 int ret;
1083
1084 priv = devm_kzalloc(&spi->dev, sizeof(*priv), GFP_KERNEL);
1085 if (!priv)
1086 return -ENOMEM;
1087
1088 spi_set_drvdata(spi, priv);
1089
1090 ret = cc2520_get_platform_data(spi, &pdata);
1091 if (ret < 0) {
1092 dev_err(&spi->dev, "no platform data\n");
1093 return -EINVAL;
1094 }
1095
1096 priv->spi = spi;
1097
1098 priv->buf = devm_kzalloc(&spi->dev,
1099 SPI_COMMAND_BUFFER, GFP_KERNEL);
1100 if (!priv->buf)
1101 return -ENOMEM;
1102
1103 mutex_init(&priv->buffer_mutex);
1104 INIT_WORK(&priv->fifop_irqwork, cc2520_fifop_irqwork);
1105 spin_lock_init(&priv->lock);
1106 init_completion(&priv->tx_complete);
1107
1108 /* Assumption that CC2591 is not connected */
1109 priv->amplified = false;
1110
1111 /* Request all the gpio's */
1112 if (!gpio_is_valid(pdata.fifo)) {
1113 dev_err(&spi->dev, "fifo gpio is not valid\n");
1114 ret = -EINVAL;
1115 goto err_hw_init;
1116 }
1117
1118 ret = devm_gpio_request_one(&spi->dev, pdata.fifo,
1119 GPIOF_IN, "fifo");
1120 if (ret)
1121 goto err_hw_init;
1122
1123 if (!gpio_is_valid(pdata.cca)) {
1124 dev_err(&spi->dev, "cca gpio is not valid\n");
1125 ret = -EINVAL;
1126 goto err_hw_init;
1127 }
1128
1129 ret = devm_gpio_request_one(&spi->dev, pdata.cca,
1130 GPIOF_IN, "cca");
1131 if (ret)
1132 goto err_hw_init;
1133
1134 if (!gpio_is_valid(pdata.fifop)) {
1135 dev_err(&spi->dev, "fifop gpio is not valid\n");
1136 ret = -EINVAL;
1137 goto err_hw_init;
1138 }
1139
1140 ret = devm_gpio_request_one(&spi->dev, pdata.fifop,
1141 GPIOF_IN, "fifop");
1142 if (ret)
1143 goto err_hw_init;
1144
1145 if (!gpio_is_valid(pdata.sfd)) {
1146 dev_err(&spi->dev, "sfd gpio is not valid\n");
1147 ret = -EINVAL;
1148 goto err_hw_init;
1149 }
1150
1151 ret = devm_gpio_request_one(&spi->dev, pdata.sfd,
1152 GPIOF_IN, "sfd");
1153 if (ret)
1154 goto err_hw_init;
1155
1156 if (!gpio_is_valid(pdata.reset)) {
1157 dev_err(&spi->dev, "reset gpio is not valid\n");
1158 ret = -EINVAL;
1159 goto err_hw_init;
1160 }
1161
1162 ret = devm_gpio_request_one(&spi->dev, pdata.reset,
1163 GPIOF_OUT_INIT_LOW, "reset");
1164 if (ret)
1165 goto err_hw_init;
1166
1167 if (!gpio_is_valid(pdata.vreg)) {
1168 dev_err(&spi->dev, "vreg gpio is not valid\n");
1169 ret = -EINVAL;
1170 goto err_hw_init;
1171 }
1172
1173 ret = devm_gpio_request_one(&spi->dev, pdata.vreg,
1174 GPIOF_OUT_INIT_LOW, "vreg");
1175 if (ret)
1176 goto err_hw_init;
1177
1178 gpio_set_value(pdata.vreg, HIGH);
1179 usleep_range(100, 150);
1180
1181 gpio_set_value(pdata.reset, HIGH);
1182 usleep_range(200, 250);
1183
1184 ret = cc2520_hw_init(priv);
1185 if (ret)
1186 goto err_hw_init;
1187
1188 /* Set up fifop interrupt */
1189 ret = devm_request_irq(&spi->dev,
1190 gpio_to_irq(pdata.fifop),
1191 cc2520_fifop_isr,
1192 IRQF_TRIGGER_RISING,
1193 dev_name(&spi->dev),
1194 priv);
1195 if (ret) {
1196 dev_err(&spi->dev, "could not get fifop irq\n");
1197 goto err_hw_init;
1198 }
1199
1200 /* Set up sfd interrupt */
1201 ret = devm_request_irq(&spi->dev,
1202 gpio_to_irq(pdata.sfd),
1203 cc2520_sfd_isr,
1204 IRQF_TRIGGER_FALLING,
1205 dev_name(&spi->dev),
1206 priv);
1207 if (ret) {
1208 dev_err(&spi->dev, "could not get sfd irq\n");
1209 goto err_hw_init;
1210 }
1211
1212 ret = cc2520_register(priv);
1213 if (ret)
1214 goto err_hw_init;
1215
1216 return 0;
1217
1218err_hw_init:
1219 mutex_destroy(&priv->buffer_mutex);
1220 flush_work(&priv->fifop_irqwork);
1221 return ret;
1222}
1223
1224static int cc2520_remove(struct spi_device *spi)
1225{
1226 struct cc2520_private *priv = spi_get_drvdata(spi);
1227
1228 mutex_destroy(&priv->buffer_mutex);
1229 flush_work(&priv->fifop_irqwork);
1230
1231 ieee802154_unregister_hw(priv->hw);
1232 ieee802154_free_hw(priv->hw);
1233
1234 return 0;
1235}
1236
1237static const struct spi_device_id cc2520_ids[] = {
1238 {"cc2520", },
1239 {},
1240};
1241MODULE_DEVICE_TABLE(spi, cc2520_ids);
1242
1243static const struct of_device_id cc2520_of_ids[] = {
1244 {.compatible = "ti,cc2520", },
1245 {},
1246};
1247MODULE_DEVICE_TABLE(of, cc2520_of_ids);
1248
1249/* SPI driver structure */
1250static struct spi_driver cc2520_driver = {
1251 .driver = {
1252 .name = "cc2520",
1253 .of_match_table = of_match_ptr(cc2520_of_ids),
1254 },
1255 .id_table = cc2520_ids,
1256 .probe = cc2520_probe,
1257 .remove = cc2520_remove,
1258};
1259module_spi_driver(cc2520_driver);
1260
1261MODULE_AUTHOR("Varka Bhadram <varkab@cdac.in>");
1262MODULE_DESCRIPTION("CC2520 Transceiver Driver");
1263MODULE_LICENSE("GPL v2");