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 25 #include <net/mac802154.h> 26 #include <net/cfg802154.h> 27 28 #define SPI_COMMAND_BUFFER 3 29 #define HIGH 1 30 #define LOW 0 31 #define STATE_IDLE 0 32 #define RSSI_VALID 0 33 #define RSSI_OFFSET 78 34 35 #define CC2520_RAM_SIZE 640 36 #define CC2520_FIFO_SIZE 128 37 38 #define CC2520RAM_TXFIFO 0x100 39 #define CC2520RAM_RXFIFO 0x180 40 #define CC2520RAM_IEEEADDR 0x3EA 41 #define CC2520RAM_PANID 0x3F2 42 #define CC2520RAM_SHORTADDR 0x3F4 43 44 #define CC2520_FREG_MASK 0x3F 45 46 /* status byte values */ 47 #define CC2520_STATUS_XOSC32M_STABLE BIT(7) 48 #define CC2520_STATUS_RSSI_VALID BIT(6) 49 #define CC2520_STATUS_TX_UNDERFLOW BIT(3) 50 51 /* IEEE-802.15.4 defined constants (2.4 GHz logical channels) */ 52 #define CC2520_MINCHANNEL 11 53 #define CC2520_MAXCHANNEL 26 54 #define CC2520_CHANNEL_SPACING 5 55 56 /* command strobes */ 57 #define CC2520_CMD_SNOP 0x00 58 #define CC2520_CMD_IBUFLD 0x02 59 #define CC2520_CMD_SIBUFEX 0x03 60 #define CC2520_CMD_SSAMPLECCA 0x04 61 #define CC2520_CMD_SRES 0x0f 62 #define CC2520_CMD_MEMORY_MASK 0x0f 63 #define CC2520_CMD_MEMORY_READ 0x10 64 #define CC2520_CMD_MEMORY_WRITE 0x20 65 #define CC2520_CMD_RXBUF 0x30 66 #define CC2520_CMD_RXBUFCP 0x38 67 #define CC2520_CMD_RXBUFMOV 0x32 68 #define CC2520_CMD_TXBUF 0x3A 69 #define CC2520_CMD_TXBUFCP 0x3E 70 #define CC2520_CMD_RANDOM 0x3C 71 #define CC2520_CMD_SXOSCON 0x40 72 #define CC2520_CMD_STXCAL 0x41 73 #define CC2520_CMD_SRXON 0x42 74 #define CC2520_CMD_STXON 0x43 75 #define CC2520_CMD_STXONCCA 0x44 76 #define CC2520_CMD_SRFOFF 0x45 77 #define CC2520_CMD_SXOSCOFF 0x46 78 #define CC2520_CMD_SFLUSHRX 0x47 79 #define CC2520_CMD_SFLUSHTX 0x48 80 #define CC2520_CMD_SACK 0x49 81 #define CC2520_CMD_SACKPEND 0x4A 82 #define CC2520_CMD_SNACK 0x4B 83 #define CC2520_CMD_SRXMASKBITSET 0x4C 84 #define CC2520_CMD_SRXMASKBITCLR 0x4D 85 #define CC2520_CMD_RXMASKAND 0x4E 86 #define CC2520_CMD_RXMASKOR 0x4F 87 #define CC2520_CMD_MEMCP 0x50 88 #define CC2520_CMD_MEMCPR 0x52 89 #define CC2520_CMD_MEMXCP 0x54 90 #define CC2520_CMD_MEMXWR 0x56 91 #define CC2520_CMD_BCLR 0x58 92 #define CC2520_CMD_BSET 0x59 93 #define CC2520_CMD_CTR_UCTR 0x60 94 #define CC2520_CMD_CBCMAC 0x64 95 #define CC2520_CMD_UCBCMAC 0x66 96 #define CC2520_CMD_CCM 0x68 97 #define CC2520_CMD_UCCM 0x6A 98 #define CC2520_CMD_ECB 0x70 99 #define CC2520_CMD_ECBO 0x72 100 #define CC2520_CMD_ECBX 0x74 101 #define CC2520_CMD_INC 0x78 102 #define CC2520_CMD_ABORT 0x7F 103 #define CC2520_CMD_REGISTER_READ 0x80 104 #define CC2520_CMD_REGISTER_WRITE 0xC0 105 106 /* status registers */ 107 #define CC2520_CHIPID 0x40 108 #define CC2520_VERSION 0x42 109 #define CC2520_EXTCLOCK 0x44 110 #define CC2520_MDMCTRL0 0x46 111 #define CC2520_MDMCTRL1 0x47 112 #define CC2520_FREQEST 0x48 113 #define CC2520_RXCTRL 0x4A 114 #define CC2520_FSCTRL 0x4C 115 #define CC2520_FSCAL0 0x4E 116 #define CC2520_FSCAL1 0x4F 117 #define CC2520_FSCAL2 0x50 118 #define CC2520_FSCAL3 0x51 119 #define CC2520_AGCCTRL0 0x52 120 #define CC2520_AGCCTRL1 0x53 121 #define CC2520_AGCCTRL2 0x54 122 #define CC2520_AGCCTRL3 0x55 123 #define CC2520_ADCTEST0 0x56 124 #define CC2520_ADCTEST1 0x57 125 #define CC2520_ADCTEST2 0x58 126 #define CC2520_MDMTEST0 0x5A 127 #define CC2520_MDMTEST1 0x5B 128 #define CC2520_DACTEST0 0x5C 129 #define CC2520_DACTEST1 0x5D 130 #define CC2520_ATEST 0x5E 131 #define CC2520_DACTEST2 0x5F 132 #define CC2520_PTEST0 0x60 133 #define CC2520_PTEST1 0x61 134 #define CC2520_RESERVED 0x62 135 #define CC2520_DPUBIST 0x7A 136 #define CC2520_ACTBIST 0x7C 137 #define CC2520_RAMBIST 0x7E 138 139 /* frame registers */ 140 #define CC2520_FRMFILT0 0x00 141 #define CC2520_FRMFILT1 0x01 142 #define CC2520_SRCMATCH 0x02 143 #define CC2520_SRCSHORTEN0 0x04 144 #define CC2520_SRCSHORTEN1 0x05 145 #define CC2520_SRCSHORTEN2 0x06 146 #define CC2520_SRCEXTEN0 0x08 147 #define CC2520_SRCEXTEN1 0x09 148 #define CC2520_SRCEXTEN2 0x0A 149 #define CC2520_FRMCTRL0 0x0C 150 #define CC2520_FRMCTRL1 0x0D 151 #define CC2520_RXENABLE0 0x0E 152 #define CC2520_RXENABLE1 0x0F 153 #define CC2520_EXCFLAG0 0x10 154 #define CC2520_EXCFLAG1 0x11 155 #define CC2520_EXCFLAG2 0x12 156 #define CC2520_EXCMASKA0 0x14 157 #define CC2520_EXCMASKA1 0x15 158 #define CC2520_EXCMASKA2 0x16 159 #define CC2520_EXCMASKB0 0x18 160 #define CC2520_EXCMASKB1 0x19 161 #define CC2520_EXCMASKB2 0x1A 162 #define CC2520_EXCBINDX0 0x1C 163 #define CC2520_EXCBINDX1 0x1D 164 #define CC2520_EXCBINDY0 0x1E 165 #define CC2520_EXCBINDY1 0x1F 166 #define CC2520_GPIOCTRL0 0x20 167 #define CC2520_GPIOCTRL1 0x21 168 #define CC2520_GPIOCTRL2 0x22 169 #define CC2520_GPIOCTRL3 0x23 170 #define CC2520_GPIOCTRL4 0x24 171 #define CC2520_GPIOCTRL5 0x25 172 #define CC2520_GPIOPOLARITY 0x26 173 #define CC2520_GPIOCTRL 0x28 174 #define CC2520_DPUCON 0x2A 175 #define CC2520_DPUSTAT 0x2C 176 #define CC2520_FREQCTRL 0x2E 177 #define CC2520_FREQTUNE 0x2F 178 #define CC2520_TXPOWER 0x30 179 #define CC2520_TXCTRL 0x31 180 #define CC2520_FSMSTAT0 0x32 181 #define CC2520_FSMSTAT1 0x33 182 #define CC2520_FIFOPCTRL 0x34 183 #define CC2520_FSMCTRL 0x35 184 #define CC2520_CCACTRL0 0x36 185 #define CC2520_CCACTRL1 0x37 186 #define CC2520_RSSI 0x38 187 #define CC2520_RSSISTAT 0x39 188 #define CC2520_RXFIRST 0x3C 189 #define CC2520_RXFIFOCNT 0x3E 190 #define CC2520_TXFIFOCNT 0x3F 191 192 /* Driver private information */ 193 struct cc2520_private { 194 struct spi_device *spi; /* SPI device structure */ 195 struct ieee802154_hw *hw; /* IEEE-802.15.4 device */ 196 u8 *buf; /* SPI TX/Rx data buffer */ 197 struct mutex buffer_mutex; /* SPI buffer mutex */ 198 bool is_tx; /* Flag for sync b/w Tx and Rx */ 199 int fifo_pin; /* FIFO GPIO pin number */ 200 struct work_struct fifop_irqwork;/* Workqueue for FIFOP */ 201 spinlock_t lock; /* Lock for is_tx*/ 202 struct completion tx_complete; /* Work completion for Tx */ 203 }; 204 205 /* Generic Functions */ 206 static int 207 cc2520_cmd_strobe(struct cc2520_private *priv, u8 cmd) 208 { 209 int ret; 210 u8 status = 0xff; 211 struct spi_message msg; 212 struct spi_transfer xfer = { 213 .len = 0, 214 .tx_buf = priv->buf, 215 .rx_buf = priv->buf, 216 }; 217 218 spi_message_init(&msg); 219 spi_message_add_tail(&xfer, &msg); 220 221 mutex_lock(&priv->buffer_mutex); 222 priv->buf[xfer.len++] = cmd; 223 dev_vdbg(&priv->spi->dev, 224 "command strobe buf[0] = %02x\n", 225 priv->buf[0]); 226 227 ret = spi_sync(priv->spi, &msg); 228 if (!ret) 229 status = priv->buf[0]; 230 dev_vdbg(&priv->spi->dev, 231 "buf[0] = %02x\n", priv->buf[0]); 232 mutex_unlock(&priv->buffer_mutex); 233 234 return ret; 235 } 236 237 static int 238 cc2520_get_status(struct cc2520_private *priv, u8 *status) 239 { 240 int ret; 241 struct spi_message msg; 242 struct spi_transfer xfer = { 243 .len = 0, 244 .tx_buf = priv->buf, 245 .rx_buf = priv->buf, 246 }; 247 248 spi_message_init(&msg); 249 spi_message_add_tail(&xfer, &msg); 250 251 mutex_lock(&priv->buffer_mutex); 252 priv->buf[xfer.len++] = CC2520_CMD_SNOP; 253 dev_vdbg(&priv->spi->dev, 254 "get status command buf[0] = %02x\n", priv->buf[0]); 255 256 ret = spi_sync(priv->spi, &msg); 257 if (!ret) 258 *status = priv->buf[0]; 259 dev_vdbg(&priv->spi->dev, 260 "buf[0] = %02x\n", priv->buf[0]); 261 mutex_unlock(&priv->buffer_mutex); 262 263 return ret; 264 } 265 266 static int 267 cc2520_write_register(struct cc2520_private *priv, u8 reg, u8 value) 268 { 269 int status; 270 struct spi_message msg; 271 struct spi_transfer xfer = { 272 .len = 0, 273 .tx_buf = priv->buf, 274 .rx_buf = priv->buf, 275 }; 276 277 spi_message_init(&msg); 278 spi_message_add_tail(&xfer, &msg); 279 280 mutex_lock(&priv->buffer_mutex); 281 282 if (reg <= CC2520_FREG_MASK) { 283 priv->buf[xfer.len++] = CC2520_CMD_REGISTER_WRITE | reg; 284 priv->buf[xfer.len++] = value; 285 } else { 286 priv->buf[xfer.len++] = CC2520_CMD_MEMORY_WRITE; 287 priv->buf[xfer.len++] = reg; 288 priv->buf[xfer.len++] = value; 289 } 290 status = spi_sync(priv->spi, &msg); 291 if (msg.status) 292 status = msg.status; 293 294 mutex_unlock(&priv->buffer_mutex); 295 296 return status; 297 } 298 299 static int 300 cc2520_write_ram(struct cc2520_private *priv, u16 reg, u8 len, u8 *data) 301 { 302 int status; 303 struct spi_message msg; 304 struct spi_transfer xfer_head = { 305 .len = 0, 306 .tx_buf = priv->buf, 307 .rx_buf = priv->buf, 308 }; 309 310 struct spi_transfer xfer_buf = { 311 .len = len, 312 .tx_buf = data, 313 }; 314 315 mutex_lock(&priv->buffer_mutex); 316 priv->buf[xfer_head.len++] = (CC2520_CMD_MEMORY_WRITE | 317 ((reg >> 8) & 0xff)); 318 priv->buf[xfer_head.len++] = reg & 0xff; 319 320 spi_message_init(&msg); 321 spi_message_add_tail(&xfer_head, &msg); 322 spi_message_add_tail(&xfer_buf, &msg); 323 324 status = spi_sync(priv->spi, &msg); 325 dev_dbg(&priv->spi->dev, "spi status = %d\n", status); 326 if (msg.status) 327 status = msg.status; 328 329 mutex_unlock(&priv->buffer_mutex); 330 return status; 331 } 332 333 static int 334 cc2520_read_register(struct cc2520_private *priv, u8 reg, u8 *data) 335 { 336 int status; 337 struct spi_message msg; 338 struct spi_transfer xfer1 = { 339 .len = 0, 340 .tx_buf = priv->buf, 341 .rx_buf = priv->buf, 342 }; 343 344 struct spi_transfer xfer2 = { 345 .len = 1, 346 .rx_buf = data, 347 }; 348 349 spi_message_init(&msg); 350 spi_message_add_tail(&xfer1, &msg); 351 spi_message_add_tail(&xfer2, &msg); 352 353 mutex_lock(&priv->buffer_mutex); 354 priv->buf[xfer1.len++] = CC2520_CMD_MEMORY_READ; 355 priv->buf[xfer1.len++] = reg; 356 357 status = spi_sync(priv->spi, &msg); 358 dev_dbg(&priv->spi->dev, 359 "spi status = %d\n", status); 360 if (msg.status) 361 status = msg.status; 362 363 mutex_unlock(&priv->buffer_mutex); 364 365 return status; 366 } 367 368 static int 369 cc2520_write_txfifo(struct cc2520_private *priv, u8 *data, u8 len) 370 { 371 int status; 372 373 /* length byte must include FCS even 374 * if it is calculated in the hardware 375 */ 376 int len_byte = len + 2; 377 378 struct spi_message msg; 379 380 struct spi_transfer xfer_head = { 381 .len = 0, 382 .tx_buf = priv->buf, 383 .rx_buf = priv->buf, 384 }; 385 struct spi_transfer xfer_len = { 386 .len = 1, 387 .tx_buf = &len_byte, 388 }; 389 struct spi_transfer xfer_buf = { 390 .len = len, 391 .tx_buf = data, 392 }; 393 394 spi_message_init(&msg); 395 spi_message_add_tail(&xfer_head, &msg); 396 spi_message_add_tail(&xfer_len, &msg); 397 spi_message_add_tail(&xfer_buf, &msg); 398 399 mutex_lock(&priv->buffer_mutex); 400 priv->buf[xfer_head.len++] = CC2520_CMD_TXBUF; 401 dev_vdbg(&priv->spi->dev, 402 "TX_FIFO cmd buf[0] = %02x\n", priv->buf[0]); 403 404 status = spi_sync(priv->spi, &msg); 405 dev_vdbg(&priv->spi->dev, "status = %d\n", status); 406 if (msg.status) 407 status = msg.status; 408 dev_vdbg(&priv->spi->dev, "status = %d\n", status); 409 dev_vdbg(&priv->spi->dev, "buf[0] = %02x\n", priv->buf[0]); 410 mutex_unlock(&priv->buffer_mutex); 411 412 return status; 413 } 414 415 static int 416 cc2520_read_rxfifo(struct cc2520_private *priv, u8 *data, u8 len, u8 *lqi) 417 { 418 int status; 419 struct spi_message msg; 420 421 struct spi_transfer xfer_head = { 422 .len = 0, 423 .tx_buf = priv->buf, 424 .rx_buf = priv->buf, 425 }; 426 struct spi_transfer xfer_buf = { 427 .len = len, 428 .rx_buf = data, 429 }; 430 431 spi_message_init(&msg); 432 spi_message_add_tail(&xfer_head, &msg); 433 spi_message_add_tail(&xfer_buf, &msg); 434 435 mutex_lock(&priv->buffer_mutex); 436 priv->buf[xfer_head.len++] = CC2520_CMD_RXBUF; 437 438 dev_vdbg(&priv->spi->dev, "read rxfifo buf[0] = %02x\n", priv->buf[0]); 439 dev_vdbg(&priv->spi->dev, "buf[1] = %02x\n", priv->buf[1]); 440 441 status = spi_sync(priv->spi, &msg); 442 dev_vdbg(&priv->spi->dev, "status = %d\n", status); 443 if (msg.status) 444 status = msg.status; 445 dev_vdbg(&priv->spi->dev, "status = %d\n", status); 446 dev_vdbg(&priv->spi->dev, 447 "return status buf[0] = %02x\n", priv->buf[0]); 448 dev_vdbg(&priv->spi->dev, "length buf[1] = %02x\n", priv->buf[1]); 449 450 mutex_unlock(&priv->buffer_mutex); 451 452 return status; 453 } 454 455 static int cc2520_start(struct ieee802154_hw *hw) 456 { 457 return cc2520_cmd_strobe(hw->priv, CC2520_CMD_SRXON); 458 } 459 460 static void cc2520_stop(struct ieee802154_hw *hw) 461 { 462 cc2520_cmd_strobe(hw->priv, CC2520_CMD_SRFOFF); 463 } 464 465 static int 466 cc2520_tx(struct ieee802154_hw *hw, struct sk_buff *skb) 467 { 468 struct cc2520_private *priv = hw->priv; 469 unsigned long flags; 470 int rc; 471 u8 status = 0; 472 473 rc = cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHTX); 474 if (rc) 475 goto err_tx; 476 477 rc = cc2520_write_txfifo(priv, skb->data, skb->len); 478 if (rc) 479 goto err_tx; 480 481 rc = cc2520_get_status(priv, &status); 482 if (rc) 483 goto err_tx; 484 485 if (status & CC2520_STATUS_TX_UNDERFLOW) { 486 dev_err(&priv->spi->dev, "cc2520 tx underflow exception\n"); 487 goto err_tx; 488 } 489 490 spin_lock_irqsave(&priv->lock, flags); 491 BUG_ON(priv->is_tx); 492 priv->is_tx = 1; 493 spin_unlock_irqrestore(&priv->lock, flags); 494 495 rc = cc2520_cmd_strobe(priv, CC2520_CMD_STXONCCA); 496 if (rc) 497 goto err; 498 499 rc = wait_for_completion_interruptible(&priv->tx_complete); 500 if (rc < 0) 501 goto err; 502 503 cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHTX); 504 cc2520_cmd_strobe(priv, CC2520_CMD_SRXON); 505 506 return rc; 507 err: 508 spin_lock_irqsave(&priv->lock, flags); 509 priv->is_tx = 0; 510 spin_unlock_irqrestore(&priv->lock, flags); 511 err_tx: 512 return rc; 513 } 514 515 static int cc2520_rx(struct cc2520_private *priv) 516 { 517 u8 len = 0, lqi = 0, bytes = 1; 518 struct sk_buff *skb; 519 520 cc2520_read_rxfifo(priv, &len, bytes, &lqi); 521 522 if (len < 2 || len > IEEE802154_MTU) 523 return -EINVAL; 524 525 skb = dev_alloc_skb(len); 526 if (!skb) 527 return -ENOMEM; 528 529 if (cc2520_read_rxfifo(priv, skb_put(skb, len), len, &lqi)) { 530 dev_dbg(&priv->spi->dev, "frame reception failed\n"); 531 kfree_skb(skb); 532 return -EINVAL; 533 } 534 535 skb_trim(skb, skb->len - 2); 536 537 ieee802154_rx_irqsafe(priv->hw, skb, lqi); 538 539 dev_vdbg(&priv->spi->dev, "RXFIFO: %x %x\n", len, lqi); 540 541 return 0; 542 } 543 544 static int 545 cc2520_ed(struct ieee802154_hw *hw, u8 *level) 546 { 547 struct cc2520_private *priv = hw->priv; 548 u8 status = 0xff; 549 u8 rssi; 550 int ret; 551 552 ret = cc2520_read_register(priv, CC2520_RSSISTAT, &status); 553 if (ret) 554 return ret; 555 556 if (status != RSSI_VALID) 557 return -EINVAL; 558 559 ret = cc2520_read_register(priv, CC2520_RSSI, &rssi); 560 if (ret) 561 return ret; 562 563 /* level = RSSI(rssi) - OFFSET [dBm] : offset is 76dBm */ 564 *level = rssi - RSSI_OFFSET; 565 566 return 0; 567 } 568 569 static int 570 cc2520_set_channel(struct ieee802154_hw *hw, u8 page, u8 channel) 571 { 572 struct cc2520_private *priv = hw->priv; 573 int ret; 574 575 dev_dbg(&priv->spi->dev, "trying to set channel\n"); 576 577 BUG_ON(page != 0); 578 BUG_ON(channel < CC2520_MINCHANNEL); 579 BUG_ON(channel > CC2520_MAXCHANNEL); 580 581 ret = cc2520_write_register(priv, CC2520_FREQCTRL, 582 11 + 5*(channel - 11)); 583 584 return ret; 585 } 586 587 static int 588 cc2520_filter(struct ieee802154_hw *hw, 589 struct ieee802154_hw_addr_filt *filt, unsigned long changed) 590 { 591 struct cc2520_private *priv = hw->priv; 592 593 if (changed & IEEE802154_AFILT_PANID_CHANGED) { 594 u16 panid = le16_to_cpu(filt->pan_id); 595 596 dev_vdbg(&priv->spi->dev, 597 "cc2520_filter called for pan id\n"); 598 cc2520_write_ram(priv, CC2520RAM_PANID, 599 sizeof(panid), (u8 *)&panid); 600 } 601 602 if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) { 603 dev_vdbg(&priv->spi->dev, 604 "cc2520_filter called for IEEE addr\n"); 605 cc2520_write_ram(priv, CC2520RAM_IEEEADDR, 606 sizeof(filt->ieee_addr), 607 (u8 *)&filt->ieee_addr); 608 } 609 610 if (changed & IEEE802154_AFILT_SADDR_CHANGED) { 611 u16 addr = le16_to_cpu(filt->short_addr); 612 613 dev_vdbg(&priv->spi->dev, 614 "cc2520_filter called for saddr\n"); 615 cc2520_write_ram(priv, CC2520RAM_SHORTADDR, 616 sizeof(addr), (u8 *)&addr); 617 } 618 619 if (changed & IEEE802154_AFILT_PANC_CHANGED) { 620 dev_vdbg(&priv->spi->dev, 621 "cc2520_filter called for panc change\n"); 622 if (filt->pan_coord) 623 cc2520_write_register(priv, CC2520_FRMFILT0, 0x02); 624 else 625 cc2520_write_register(priv, CC2520_FRMFILT0, 0x00); 626 } 627 628 return 0; 629 } 630 631 static const struct ieee802154_ops cc2520_ops = { 632 .owner = THIS_MODULE, 633 .start = cc2520_start, 634 .stop = cc2520_stop, 635 .xmit_sync = cc2520_tx, 636 .ed = cc2520_ed, 637 .set_channel = cc2520_set_channel, 638 .set_hw_addr_filt = cc2520_filter, 639 }; 640 641 static int cc2520_register(struct cc2520_private *priv) 642 { 643 int ret = -ENOMEM; 644 645 priv->hw = ieee802154_alloc_hw(sizeof(*priv), &cc2520_ops); 646 if (!priv->hw) 647 goto err_ret; 648 649 priv->hw->priv = priv; 650 priv->hw->parent = &priv->spi->dev; 651 priv->hw->extra_tx_headroom = 0; 652 priv->hw->vif_data_size = sizeof(*priv); 653 ieee802154_random_extended_addr(&priv->hw->phy->perm_extended_addr); 654 655 /* We do support only 2.4 Ghz */ 656 priv->hw->phy->channels_supported[0] = 0x7FFF800; 657 priv->hw->flags = IEEE802154_HW_OMIT_CKSUM | IEEE802154_HW_AACK | 658 IEEE802154_HW_AFILT; 659 660 dev_vdbg(&priv->spi->dev, "registered cc2520\n"); 661 ret = ieee802154_register_hw(priv->hw); 662 if (ret) 663 goto err_free_device; 664 665 return 0; 666 667 err_free_device: 668 ieee802154_free_hw(priv->hw); 669 err_ret: 670 return ret; 671 } 672 673 static void cc2520_fifop_irqwork(struct work_struct *work) 674 { 675 struct cc2520_private *priv 676 = container_of(work, struct cc2520_private, fifop_irqwork); 677 678 dev_dbg(&priv->spi->dev, "fifop interrupt received\n"); 679 680 if (gpio_get_value(priv->fifo_pin)) 681 cc2520_rx(priv); 682 else 683 dev_dbg(&priv->spi->dev, "rxfifo overflow\n"); 684 685 cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHRX); 686 cc2520_cmd_strobe(priv, CC2520_CMD_SFLUSHRX); 687 } 688 689 static irqreturn_t cc2520_fifop_isr(int irq, void *data) 690 { 691 struct cc2520_private *priv = data; 692 693 schedule_work(&priv->fifop_irqwork); 694 695 return IRQ_HANDLED; 696 } 697 698 static irqreturn_t cc2520_sfd_isr(int irq, void *data) 699 { 700 struct cc2520_private *priv = data; 701 unsigned long flags; 702 703 spin_lock_irqsave(&priv->lock, flags); 704 if (priv->is_tx) { 705 priv->is_tx = 0; 706 spin_unlock_irqrestore(&priv->lock, flags); 707 dev_dbg(&priv->spi->dev, "SFD for TX\n"); 708 complete(&priv->tx_complete); 709 } else { 710 spin_unlock_irqrestore(&priv->lock, flags); 711 dev_dbg(&priv->spi->dev, "SFD for RX\n"); 712 } 713 714 return IRQ_HANDLED; 715 } 716 717 static int cc2520_hw_init(struct cc2520_private *priv) 718 { 719 u8 status = 0, state = 0xff; 720 int ret; 721 int timeout = 100; 722 723 ret = cc2520_read_register(priv, CC2520_FSMSTAT1, &state); 724 if (ret) 725 goto err_ret; 726 727 if (state != STATE_IDLE) 728 return -EINVAL; 729 730 do { 731 ret = cc2520_get_status(priv, &status); 732 if (ret) 733 goto err_ret; 734 735 if (timeout-- <= 0) { 736 dev_err(&priv->spi->dev, "oscillator start failed!\n"); 737 return ret; 738 } 739 udelay(1); 740 } while (!(status & CC2520_STATUS_XOSC32M_STABLE)); 741 742 dev_vdbg(&priv->spi->dev, "oscillator brought up\n"); 743 744 /* Registers default value: section 28.1 in Datasheet */ 745 ret = cc2520_write_register(priv, CC2520_TXPOWER, 0xF7); 746 if (ret) 747 goto err_ret; 748 749 ret = cc2520_write_register(priv, CC2520_CCACTRL0, 0x1A); 750 if (ret) 751 goto err_ret; 752 753 ret = cc2520_write_register(priv, CC2520_MDMCTRL0, 0x85); 754 if (ret) 755 goto err_ret; 756 757 ret = cc2520_write_register(priv, CC2520_MDMCTRL1, 0x14); 758 if (ret) 759 goto err_ret; 760 761 ret = cc2520_write_register(priv, CC2520_RXCTRL, 0x3f); 762 if (ret) 763 goto err_ret; 764 765 ret = cc2520_write_register(priv, CC2520_FSCTRL, 0x5a); 766 if (ret) 767 goto err_ret; 768 769 ret = cc2520_write_register(priv, CC2520_FSCAL1, 0x2b); 770 if (ret) 771 goto err_ret; 772 773 ret = cc2520_write_register(priv, CC2520_AGCCTRL1, 0x11); 774 if (ret) 775 goto err_ret; 776 777 ret = cc2520_write_register(priv, CC2520_ADCTEST0, 0x10); 778 if (ret) 779 goto err_ret; 780 781 ret = cc2520_write_register(priv, CC2520_ADCTEST1, 0x0e); 782 if (ret) 783 goto err_ret; 784 785 ret = cc2520_write_register(priv, CC2520_ADCTEST2, 0x03); 786 if (ret) 787 goto err_ret; 788 789 ret = cc2520_write_register(priv, CC2520_FRMCTRL0, 0x60); 790 if (ret) 791 goto err_ret; 792 793 ret = cc2520_write_register(priv, CC2520_FRMCTRL1, 0x03); 794 if (ret) 795 goto err_ret; 796 797 ret = cc2520_write_register(priv, CC2520_FRMFILT0, 0x00); 798 if (ret) 799 goto err_ret; 800 801 ret = cc2520_write_register(priv, CC2520_FIFOPCTRL, 127); 802 if (ret) 803 goto err_ret; 804 805 return 0; 806 807 err_ret: 808 return ret; 809 } 810 811 static struct cc2520_platform_data * 812 cc2520_get_platform_data(struct spi_device *spi) 813 { 814 struct cc2520_platform_data *pdata; 815 struct device_node *np = spi->dev.of_node; 816 struct cc2520_private *priv = spi_get_drvdata(spi); 817 818 if (!np) 819 return spi->dev.platform_data; 820 821 pdata = devm_kzalloc(&spi->dev, sizeof(*pdata), GFP_KERNEL); 822 if (!pdata) 823 goto done; 824 825 pdata->fifo = of_get_named_gpio(np, "fifo-gpio", 0); 826 priv->fifo_pin = pdata->fifo; 827 828 pdata->fifop = of_get_named_gpio(np, "fifop-gpio", 0); 829 830 pdata->sfd = of_get_named_gpio(np, "sfd-gpio", 0); 831 pdata->cca = of_get_named_gpio(np, "cca-gpio", 0); 832 pdata->vreg = of_get_named_gpio(np, "vreg-gpio", 0); 833 pdata->reset = of_get_named_gpio(np, "reset-gpio", 0); 834 835 spi->dev.platform_data = pdata; 836 837 done: 838 return pdata; 839 } 840 841 static int cc2520_probe(struct spi_device *spi) 842 { 843 struct cc2520_private *priv; 844 struct cc2520_platform_data *pdata; 845 int ret; 846 847 priv = devm_kzalloc(&spi->dev, sizeof(*priv), GFP_KERNEL); 848 if (!priv) 849 return -ENOMEM; 850 851 spi_set_drvdata(spi, priv); 852 853 pdata = cc2520_get_platform_data(spi); 854 if (!pdata) { 855 dev_err(&spi->dev, "no platform data\n"); 856 return -EINVAL; 857 } 858 859 priv->spi = spi; 860 861 priv->buf = devm_kzalloc(&spi->dev, 862 SPI_COMMAND_BUFFER, GFP_KERNEL); 863 if (!priv->buf) 864 return -ENOMEM; 865 866 mutex_init(&priv->buffer_mutex); 867 INIT_WORK(&priv->fifop_irqwork, cc2520_fifop_irqwork); 868 spin_lock_init(&priv->lock); 869 init_completion(&priv->tx_complete); 870 871 /* Request all the gpio's */ 872 if (!gpio_is_valid(pdata->fifo)) { 873 dev_err(&spi->dev, "fifo gpio is not valid\n"); 874 ret = -EINVAL; 875 goto err_hw_init; 876 } 877 878 ret = devm_gpio_request_one(&spi->dev, pdata->fifo, 879 GPIOF_IN, "fifo"); 880 if (ret) 881 goto err_hw_init; 882 883 if (!gpio_is_valid(pdata->cca)) { 884 dev_err(&spi->dev, "cca gpio is not valid\n"); 885 ret = -EINVAL; 886 goto err_hw_init; 887 } 888 889 ret = devm_gpio_request_one(&spi->dev, pdata->cca, 890 GPIOF_IN, "cca"); 891 if (ret) 892 goto err_hw_init; 893 894 if (!gpio_is_valid(pdata->fifop)) { 895 dev_err(&spi->dev, "fifop gpio is not valid\n"); 896 ret = -EINVAL; 897 goto err_hw_init; 898 } 899 900 ret = devm_gpio_request_one(&spi->dev, pdata->fifop, 901 GPIOF_IN, "fifop"); 902 if (ret) 903 goto err_hw_init; 904 905 if (!gpio_is_valid(pdata->sfd)) { 906 dev_err(&spi->dev, "sfd gpio is not valid\n"); 907 ret = -EINVAL; 908 goto err_hw_init; 909 } 910 911 ret = devm_gpio_request_one(&spi->dev, pdata->sfd, 912 GPIOF_IN, "sfd"); 913 if (ret) 914 goto err_hw_init; 915 916 if (!gpio_is_valid(pdata->reset)) { 917 dev_err(&spi->dev, "reset gpio is not valid\n"); 918 ret = -EINVAL; 919 goto err_hw_init; 920 } 921 922 ret = devm_gpio_request_one(&spi->dev, pdata->reset, 923 GPIOF_OUT_INIT_LOW, "reset"); 924 if (ret) 925 goto err_hw_init; 926 927 if (!gpio_is_valid(pdata->vreg)) { 928 dev_err(&spi->dev, "vreg gpio is not valid\n"); 929 ret = -EINVAL; 930 goto err_hw_init; 931 } 932 933 ret = devm_gpio_request_one(&spi->dev, pdata->vreg, 934 GPIOF_OUT_INIT_LOW, "vreg"); 935 if (ret) 936 goto err_hw_init; 937 938 gpio_set_value(pdata->vreg, HIGH); 939 usleep_range(100, 150); 940 941 gpio_set_value(pdata->reset, HIGH); 942 usleep_range(200, 250); 943 944 ret = cc2520_hw_init(priv); 945 if (ret) 946 goto err_hw_init; 947 948 /* Set up fifop interrupt */ 949 ret = devm_request_irq(&spi->dev, 950 gpio_to_irq(pdata->fifop), 951 cc2520_fifop_isr, 952 IRQF_TRIGGER_RISING, 953 dev_name(&spi->dev), 954 priv); 955 if (ret) { 956 dev_err(&spi->dev, "could not get fifop irq\n"); 957 goto err_hw_init; 958 } 959 960 /* Set up sfd interrupt */ 961 ret = devm_request_irq(&spi->dev, 962 gpio_to_irq(pdata->sfd), 963 cc2520_sfd_isr, 964 IRQF_TRIGGER_FALLING, 965 dev_name(&spi->dev), 966 priv); 967 if (ret) { 968 dev_err(&spi->dev, "could not get sfd irq\n"); 969 goto err_hw_init; 970 } 971 972 ret = cc2520_register(priv); 973 if (ret) 974 goto err_hw_init; 975 976 return 0; 977 978 err_hw_init: 979 mutex_destroy(&priv->buffer_mutex); 980 flush_work(&priv->fifop_irqwork); 981 return ret; 982 } 983 984 static int cc2520_remove(struct spi_device *spi) 985 { 986 struct cc2520_private *priv = spi_get_drvdata(spi); 987 988 mutex_destroy(&priv->buffer_mutex); 989 flush_work(&priv->fifop_irqwork); 990 991 ieee802154_unregister_hw(priv->hw); 992 ieee802154_free_hw(priv->hw); 993 994 return 0; 995 } 996 997 static const struct spi_device_id cc2520_ids[] = { 998 {"cc2520", }, 999 {}, 1000 }; 1001 MODULE_DEVICE_TABLE(spi, cc2520_ids); 1002 1003 static const struct of_device_id cc2520_of_ids[] = { 1004 {.compatible = "ti,cc2520", }, 1005 {}, 1006 }; 1007 MODULE_DEVICE_TABLE(of, cc2520_of_ids); 1008 1009 /* SPI driver structure */ 1010 static struct spi_driver cc2520_driver = { 1011 .driver = { 1012 .name = "cc2520", 1013 .bus = &spi_bus_type, 1014 .owner = THIS_MODULE, 1015 .of_match_table = of_match_ptr(cc2520_of_ids), 1016 }, 1017 .id_table = cc2520_ids, 1018 .probe = cc2520_probe, 1019 .remove = cc2520_remove, 1020 }; 1021 module_spi_driver(cc2520_driver); 1022 1023 MODULE_AUTHOR("Varka Bhadram <varkab@cdac.in>"); 1024 MODULE_DESCRIPTION("CC2520 Transceiver Driver"); 1025 MODULE_LICENSE("GPL v2"); 1026