drivers/net/ieee802154/cc2520.c

   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    (1 << 7)
  48 #define CC2520_STATUS_RSSI_VALID        (1 << 6)
  49 #define CC2520_STATUS_TX_UNDERFLOW      (1 << 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");