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 */
207 struct 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 */
222 static int
cc2520_cmd_strobe(struct cc2520_private * priv,u8 cmd)223 cc2520_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
253 static int
cc2520_get_status(struct cc2520_private * priv,u8 * status)254 cc2520_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
282 static int
cc2520_write_register(struct cc2520_private * priv,u8 reg,u8 value)283 cc2520_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
315 static int
cc2520_write_ram(struct cc2520_private * priv,u16 reg,u8 len,u8 * data)316 cc2520_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
349 static int
cc2520_read_register(struct cc2520_private * priv,u8 reg,u8 * data)350 cc2520_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
384 static int
cc2520_write_txfifo(struct cc2520_private * priv,u8 pkt_len,u8 * data,u8 len)385 cc2520_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
431 static int
cc2520_read_rxfifo(struct cc2520_private * priv,u8 * data,u8 len)432 cc2520_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
cc2520_start(struct ieee802154_hw * hw)471 static int cc2520_start(struct ieee802154_hw *hw)
472 {
473 return cc2520_cmd_strobe(hw->priv, CC2520_CMD_SRXON);
474 }
475
cc2520_stop(struct ieee802154_hw * hw)476 static void cc2520_stop(struct ieee802154_hw *hw)
477 {
478 cc2520_cmd_strobe(hw->priv, CC2520_CMD_SRFOFF);
479 }
480
481 static int
cc2520_tx(struct ieee802154_hw * hw,struct sk_buff * skb)482 cc2520_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;
536 err:
537 spin_lock_irqsave(&priv->lock, flags);
538 priv->is_tx = 0;
539 spin_unlock_irqrestore(&priv->lock, flags);
540 err_tx:
541 return rc;
542 }
543
cc2520_rx(struct cc2520_private * priv)544 static 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
613 static int
cc2520_ed(struct ieee802154_hw * hw,u8 * level)614 cc2520_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
638 static int
cc2520_set_channel(struct ieee802154_hw * hw,u8 page,u8 channel)639 cc2520_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
656 static int
cc2520_filter(struct ieee802154_hw * hw,struct ieee802154_hw_addr_filt * filt,unsigned long changed)657 cc2520_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
cc2520_set_tx_power(struct cc2520_private * priv,s32 mbm)706 static 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
cc2520_cc2591_set_tx_power(struct cc2520_private * priv,s32 mbm)745 static 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
777 static 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
782 static const s32 cc2520_cc2591_powers[CC2520_CC2591_MAX_TX_POWERS + 1] = {
783 1700, 1600, 1400, 1100, -100, -800,
784 };
785
786 static int
cc2520_set_txpower(struct ieee802154_hw * hw,s32 mbm)787 cc2520_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
797 static int
cc2520_set_promiscuous_mode(struct ieee802154_hw * hw,bool on)798 cc2520_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
821 static 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
cc2520_register(struct cc2520_private * priv)833 static 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
872 err_free_device:
873 ieee802154_free_hw(priv->hw);
874 err_ret:
875 return ret;
876 }
877
cc2520_fifop_irqwork(struct work_struct * work)878 static 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
cc2520_fifop_isr(int irq,void * data)894 static 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
cc2520_sfd_isr(int irq,void * data)903 static 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
cc2520_get_platform_data(struct spi_device * spi,struct cc2520_platform_data * pdata)922 static 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
cc2520_hw_init(struct cc2520_private * priv)955 static 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
1074 err_ret:
1075 return ret;
1076 }
1077
cc2520_probe(struct spi_device * spi)1078 static 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
1218 err_hw_init:
1219 mutex_destroy(&priv->buffer_mutex);
1220 flush_work(&priv->fifop_irqwork);
1221 return ret;
1222 }
1223
cc2520_remove(struct spi_device * spi)1224 static 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
1237 static const struct spi_device_id cc2520_ids[] = {
1238 {"cc2520", },
1239 {},
1240 };
1241 MODULE_DEVICE_TABLE(spi, cc2520_ids);
1242
1243 static const struct of_device_id cc2520_of_ids[] = {
1244 {.compatible = "ti,cc2520", },
1245 {},
1246 };
1247 MODULE_DEVICE_TABLE(of, cc2520_of_ids);
1248
1249 /* SPI driver structure */
1250 static 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 };
1259 module_spi_driver(cc2520_driver);
1260
1261 MODULE_AUTHOR("Varka Bhadram <varkab@cdac.in>");
1262 MODULE_DESCRIPTION("CC2520 Transceiver Driver");
1263 MODULE_LICENSE("GPL v2");
1264
