drivers/net/ieee802154/mcr20a.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Driver for NXP MCR20A 802.15.4 Wireless-PAN Networking controller
   4  *
   5  * Copyright (C) 2018 Xue Liu <[email protected]>
   6  */
   7 #include <linux/kernel.h>
   8 #include <linux/module.h>
   9 #include <linux/gpio/consumer.h>
  10 #include <linux/spi/spi.h>
  11 #include <linux/workqueue.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/irq.h>
  14 #include <linux/skbuff.h>
  15 #include <linux/of_gpio.h>
  16 #include <linux/regmap.h>
  17 #include <linux/ieee802154.h>
  18 #include <linux/debugfs.h>
  19
  20 #include <net/mac802154.h>
  21 #include <net/cfg802154.h>
  22
  23 #include <linux/device.h>
  24
  25 #include "mcr20a.h"
  26
  27 #define SPI_COMMAND_BUFFER              3
  28
  29 #define REGISTER_READ                   BIT(7)
  30 #define REGISTER_WRITE                  (0 << 7)
  31 #define REGISTER_ACCESS                 (0 << 6)
  32 #define PACKET_BUFF_BURST_ACCESS        BIT(6)
  33 #define PACKET_BUFF_BYTE_ACCESS         BIT(5)
  34
  35 #define MCR20A_WRITE_REG(x)             (x)
  36 #define MCR20A_READ_REG(x)              (REGISTER_READ | (x))
  37 #define MCR20A_BURST_READ_PACKET_BUF    (0xC0)
  38 #define MCR20A_BURST_WRITE_PACKET_BUF   (0x40)
  39
  40 #define MCR20A_CMD_REG          0x80
  41 #define MCR20A_CMD_REG_MASK     0x3f
  42 #define MCR20A_CMD_WRITE        0x40
  43 #define MCR20A_CMD_FB           0x20
  44
  45 /* Number of Interrupt Request Status Register */
  46 #define MCR20A_IRQSTS_NUM 2 /* only IRQ_STS1 and IRQ_STS2 */
  47
  48 /* MCR20A CCA Type */
  49 enum {
  50         MCR20A_CCA_ED,    // energy detect - CCA bit not active,
  51                           // not to be used for T and CCCA sequences
  52         MCR20A_CCA_MODE1, // energy detect - CCA bit ACTIVE
  53         MCR20A_CCA_MODE2, // 802.15.4 compliant signal detect - CCA bit ACTIVE
  54         MCR20A_CCA_MODE3
  55 };
  56
  57 enum {
  58         MCR20A_XCVSEQ_IDLE      = 0x00,
  59         MCR20A_XCVSEQ_RX        = 0x01,
  60         MCR20A_XCVSEQ_TX        = 0x02,
  61         MCR20A_XCVSEQ_CCA       = 0x03,
  62         MCR20A_XCVSEQ_TR        = 0x04,
  63         MCR20A_XCVSEQ_CCCA      = 0x05,
  64 };
  65
  66 /* IEEE-802.15.4 defined constants (2.4 GHz logical channels) */
  67 #define MCR20A_MIN_CHANNEL      (11)
  68 #define MCR20A_MAX_CHANNEL      (26)
  69 #define MCR20A_CHANNEL_SPACING  (5)
  70
  71 /* MCR20A CCA Threshold constans */
  72 #define MCR20A_MIN_CCA_THRESHOLD (0x6EU)
  73 #define MCR20A_MAX_CCA_THRESHOLD (0x00U)
  74
  75 /* version 0C */
  76 #define MCR20A_OVERWRITE_VERSION (0x0C)
  77
  78 /* MCR20A PLL configurations */
  79 static const u8  PLL_INT[16] = {
  80         /* 2405 */ 0x0B,        /* 2410 */ 0x0B,        /* 2415 */ 0x0B,
  81         /* 2420 */ 0x0B,        /* 2425 */ 0x0B,        /* 2430 */ 0x0B,
  82         /* 2435 */ 0x0C,        /* 2440 */ 0x0C,        /* 2445 */ 0x0C,
  83         /* 2450 */ 0x0C,        /* 2455 */ 0x0C,        /* 2460 */ 0x0C,
  84         /* 2465 */ 0x0D,        /* 2470 */ 0x0D,        /* 2475 */ 0x0D,
  85         /* 2480 */ 0x0D
  86 };
  87
  88 static const u8 PLL_FRAC[16] = {
  89         /* 2405 */ 0x28,        /* 2410 */ 0x50,        /* 2415 */ 0x78,
  90         /* 2420 */ 0xA0,        /* 2425 */ 0xC8,        /* 2430 */ 0xF0,
  91         /* 2435 */ 0x18,        /* 2440 */ 0x40,        /* 2445 */ 0x68,
  92         /* 2450 */ 0x90,        /* 2455 */ 0xB8,        /* 2460 */ 0xE0,
  93         /* 2465 */ 0x08,        /* 2470 */ 0x30,        /* 2475 */ 0x58,
  94         /* 2480 */ 0x80
  95 };
  96
  97 static const struct reg_sequence mar20a_iar_overwrites[] = {
  98         { IAR_MISC_PAD_CTRL,    0x02 },
  99         { IAR_VCO_CTRL1,        0xB3 },
 100         { IAR_VCO_CTRL2,        0x07 },
 101         { IAR_PA_TUNING,        0x71 },
 102         { IAR_CHF_IBUF,         0x2F },
 103         { IAR_CHF_QBUF,         0x2F },
 104         { IAR_CHF_IRIN,         0x24 },
 105         { IAR_CHF_QRIN,         0x24 },
 106         { IAR_CHF_IL,           0x24 },
 107         { IAR_CHF_QL,           0x24 },
 108         { IAR_CHF_CC1,          0x32 },
 109         { IAR_CHF_CCL,          0x1D },
 110         { IAR_CHF_CC2,          0x2D },
 111         { IAR_CHF_IROUT,        0x24 },
 112         { IAR_CHF_QROUT,        0x24 },
 113         { IAR_PA_CAL,           0x28 },
 114         { IAR_AGC_THR1,         0x55 },
 115         { IAR_AGC_THR2,         0x2D },
 116         { IAR_ATT_RSSI1,        0x5F },
 117         { IAR_ATT_RSSI2,        0x8F },
 118         { IAR_RSSI_OFFSET,      0x61 },
 119         { IAR_CHF_PMA_GAIN,     0x03 },
 120         { IAR_CCA1_THRESH,      0x50 },
 121         { IAR_CORR_NVAL,        0x13 },
 122         { IAR_ACKDELAY,         0x3D },
 123 };
 124
 125 #define MCR20A_VALID_CHANNELS (0x07FFF800)
 126 #define MCR20A_MAX_BUF          (127)
 127
 128 #define printdev(X) (&X->spi->dev)
 129
 130 /* regmap information for Direct Access Register (DAR) access */
 131 #define MCR20A_DAR_WRITE        0x01
 132 #define MCR20A_DAR_READ         0x00
 133 #define MCR20A_DAR_NUMREGS      0x3F
 134
 135 /* regmap information for Indirect Access Register (IAR) access */
 136 #define MCR20A_IAR_ACCESS       0x80
 137 #define MCR20A_IAR_NUMREGS      0xBEFF
 138
 139 /* Read/Write SPI Commands for DAR and IAR registers. */
 140 #define MCR20A_READSHORT(reg)   ((reg) << 1)
 141 #define MCR20A_WRITESHORT(reg)  ((reg) << 1 | 1)
 142 #define MCR20A_READLONG(reg)    (1 << 15 | (reg) << 5)
 143 #define MCR20A_WRITELONG(reg)   (1 << 15 | (reg) << 5 | 1 << 4)
 144
 145 /* Type definitions for link configuration of instantiable layers  */
 146 #define MCR20A_PHY_INDIRECT_QUEUE_SIZE (12)
 147
 148 static bool
 149 mcr20a_dar_writeable(struct device *dev, unsigned int reg)
 150 {
 151         switch (reg) {
 152         case DAR_IRQ_STS1:
 153         case DAR_IRQ_STS2:
 154         case DAR_IRQ_STS3:
 155         case DAR_PHY_CTRL1:
 156         case DAR_PHY_CTRL2:
 157         case DAR_PHY_CTRL3:
 158         case DAR_PHY_CTRL4:
 159         case DAR_SRC_CTRL:
 160         case DAR_SRC_ADDRS_SUM_LSB:
 161         case DAR_SRC_ADDRS_SUM_MSB:
 162         case DAR_T3CMP_LSB:
 163         case DAR_T3CMP_MSB:
 164         case DAR_T3CMP_USB:
 165         case DAR_T2PRIMECMP_LSB:
 166         case DAR_T2PRIMECMP_MSB:
 167         case DAR_T1CMP_LSB:
 168         case DAR_T1CMP_MSB:
 169         case DAR_T1CMP_USB:
 170         case DAR_T2CMP_LSB:
 171         case DAR_T2CMP_MSB:
 172         case DAR_T2CMP_USB:
 173         case DAR_T4CMP_LSB:
 174         case DAR_T4CMP_MSB:
 175         case DAR_T4CMP_USB:
 176         case DAR_PLL_INT0:
 177         case DAR_PLL_FRAC0_LSB:
 178         case DAR_PLL_FRAC0_MSB:
 179         case DAR_PA_PWR:
 180         /* no DAR_ACM */
 181         case DAR_OVERWRITE_VER:
 182         case DAR_CLK_OUT_CTRL:
 183         case DAR_PWR_MODES:
 184                 return true;
 185         default:
 186                 return false;
 187         }
 188 }
 189
 190 static bool
 191 mcr20a_dar_readable(struct device *dev, unsigned int reg)
 192 {
 193         bool rc;
 194
 195         /* all writeable are also readable */
 196         rc = mcr20a_dar_writeable(dev, reg);
 197         if (rc)
 198                 return rc;
 199
 200         /* readonly regs */
 201         switch (reg) {
 202         case DAR_RX_FRM_LEN:
 203         case DAR_CCA1_ED_FNL:
 204         case DAR_EVENT_TMR_LSB:
 205         case DAR_EVENT_TMR_MSB:
 206         case DAR_EVENT_TMR_USB:
 207         case DAR_TIMESTAMP_LSB:
 208         case DAR_TIMESTAMP_MSB:
 209         case DAR_TIMESTAMP_USB:
 210         case DAR_SEQ_STATE:
 211         case DAR_LQI_VALUE:
 212         case DAR_RSSI_CCA_CONT:
 213                 return true;
 214         default:
 215                 return false;
 216         }
 217 }
 218
 219 static bool
 220 mcr20a_dar_volatile(struct device *dev, unsigned int reg)
 221 {
 222         /* can be changed during runtime */
 223         switch (reg) {
 224         case DAR_IRQ_STS1:
 225         case DAR_IRQ_STS2:
 226         case DAR_IRQ_STS3:
 227         /* use them in spi_async and regmap so it's volatile */
 228                 return true;
 229         default:
 230                 return false;
 231         }
 232 }
 233
 234 static bool
 235 mcr20a_dar_precious(struct device *dev, unsigned int reg)
 236 {
 237         /* don't clear irq line on read */
 238         switch (reg) {
 239         case DAR_IRQ_STS1:
 240         case DAR_IRQ_STS2:
 241         case DAR_IRQ_STS3:
 242                 return true;
 243         default:
 244                 return false;
 245         }
 246 }
 247
 248 static const struct regmap_config mcr20a_dar_regmap = {
 249         .name                   = "mcr20a_dar",
 250         .reg_bits               = 8,
 251         .val_bits               = 8,
 252         .write_flag_mask        = REGISTER_ACCESS | REGISTER_WRITE,
 253         .read_flag_mask         = REGISTER_ACCESS | REGISTER_READ,
 254         .cache_type             = REGCACHE_RBTREE,
 255         .writeable_reg          = mcr20a_dar_writeable,
 256         .readable_reg           = mcr20a_dar_readable,
 257         .volatile_reg           = mcr20a_dar_volatile,
 258         .precious_reg           = mcr20a_dar_precious,
 259         .fast_io                = true,
 260         .can_multi_write        = true,
 261 };
 262
 263 static bool
 264 mcr20a_iar_writeable(struct device *dev, unsigned int reg)
 265 {
 266         switch (reg) {
 267         case IAR_XTAL_TRIM:
 268         case IAR_PMC_LP_TRIM:
 269         case IAR_MACPANID0_LSB:
 270         case IAR_MACPANID0_MSB:
 271         case IAR_MACSHORTADDRS0_LSB:
 272         case IAR_MACSHORTADDRS0_MSB:
 273         case IAR_MACLONGADDRS0_0:
 274         case IAR_MACLONGADDRS0_8:
 275         case IAR_MACLONGADDRS0_16:
 276         case IAR_MACLONGADDRS0_24:
 277         case IAR_MACLONGADDRS0_32:
 278         case IAR_MACLONGADDRS0_40:
 279         case IAR_MACLONGADDRS0_48:
 280         case IAR_MACLONGADDRS0_56:
 281         case IAR_RX_FRAME_FILTER:
 282         case IAR_PLL_INT1:
 283         case IAR_PLL_FRAC1_LSB:
 284         case IAR_PLL_FRAC1_MSB:
 285         case IAR_MACPANID1_LSB:
 286         case IAR_MACPANID1_MSB:
 287         case IAR_MACSHORTADDRS1_LSB:
 288         case IAR_MACSHORTADDRS1_MSB:
 289         case IAR_MACLONGADDRS1_0:
 290         case IAR_MACLONGADDRS1_8:
 291         case IAR_MACLONGADDRS1_16:
 292         case IAR_MACLONGADDRS1_24:
 293         case IAR_MACLONGADDRS1_32:
 294         case IAR_MACLONGADDRS1_40:
 295         case IAR_MACLONGADDRS1_48:
 296         case IAR_MACLONGADDRS1_56:
 297         case IAR_DUAL_PAN_CTRL:
 298         case IAR_DUAL_PAN_DWELL:
 299         case IAR_CCA1_THRESH:
 300         case IAR_CCA1_ED_OFFSET_COMP:
 301         case IAR_LQI_OFFSET_COMP:
 302         case IAR_CCA_CTRL:
 303         case IAR_CCA2_CORR_PEAKS:
 304         case IAR_CCA2_CORR_THRESH:
 305         case IAR_TMR_PRESCALE:
 306         case IAR_ANT_PAD_CTRL:
 307         case IAR_MISC_PAD_CTRL:
 308         case IAR_BSM_CTRL:
 309         case IAR_RNG:
 310         case IAR_RX_WTR_MARK:
 311         case IAR_SOFT_RESET:
 312         case IAR_TXDELAY:
 313         case IAR_ACKDELAY:
 314         case IAR_CORR_NVAL:
 315         case IAR_ANT_AGC_CTRL:
 316         case IAR_AGC_THR1:
 317         case IAR_AGC_THR2:
 318         case IAR_PA_CAL:
 319         case IAR_ATT_RSSI1:
 320         case IAR_ATT_RSSI2:
 321         case IAR_RSSI_OFFSET:
 322         case IAR_XTAL_CTRL:
 323         case IAR_CHF_PMA_GAIN:
 324         case IAR_CHF_IBUF:
 325         case IAR_CHF_QBUF:
 326         case IAR_CHF_IRIN:
 327         case IAR_CHF_QRIN:
 328         case IAR_CHF_IL:
 329         case IAR_CHF_QL:
 330         case IAR_CHF_CC1:
 331         case IAR_CHF_CCL:
 332         case IAR_CHF_CC2:
 333         case IAR_CHF_IROUT:
 334         case IAR_CHF_QROUT:
 335         case IAR_PA_TUNING:
 336         case IAR_VCO_CTRL1:
 337         case IAR_VCO_CTRL2:
 338                 return true;
 339         default:
 340                 return false;
 341         }
 342 }
 343
 344 static bool
 345 mcr20a_iar_readable(struct device *dev, unsigned int reg)
 346 {
 347         bool rc;
 348
 349         /* all writeable are also readable */
 350         rc = mcr20a_iar_writeable(dev, reg);
 351         if (rc)
 352                 return rc;
 353
 354         /* readonly regs */
 355         switch (reg) {
 356         case IAR_PART_ID:
 357         case IAR_DUAL_PAN_STS:
 358         case IAR_RX_BYTE_COUNT:
 359         case IAR_FILTERFAIL_CODE1:
 360         case IAR_FILTERFAIL_CODE2:
 361         case IAR_RSSI:
 362                 return true;
 363         default:
 364                 return false;
 365         }
 366 }
 367
 368 static bool
 369 mcr20a_iar_volatile(struct device *dev, unsigned int reg)
 370 {
 371 /* can be changed during runtime */
 372         switch (reg) {
 373         case IAR_DUAL_PAN_STS:
 374         case IAR_RX_BYTE_COUNT:
 375         case IAR_FILTERFAIL_CODE1:
 376         case IAR_FILTERFAIL_CODE2:
 377         case IAR_RSSI:
 378                 return true;
 379         default:
 380                 return false;
 381         }
 382 }
 383
 384 static const struct regmap_config mcr20a_iar_regmap = {
 385         .name                   = "mcr20a_iar",
 386         .reg_bits               = 16,
 387         .val_bits               = 8,
 388         .write_flag_mask        = REGISTER_ACCESS | REGISTER_WRITE | IAR_INDEX,
 389         .read_flag_mask         = REGISTER_ACCESS | REGISTER_READ  | IAR_INDEX,
 390         .cache_type             = REGCACHE_RBTREE,
 391         .writeable_reg          = mcr20a_iar_writeable,
 392         .readable_reg           = mcr20a_iar_readable,
 393         .volatile_reg           = mcr20a_iar_volatile,
 394         .fast_io                = true,
 395 };
 396
 397 struct mcr20a_local {
 398         struct spi_device *spi;
 399
 400         struct ieee802154_hw *hw;
 401         struct regmap *regmap_dar;
 402         struct regmap *regmap_iar;
 403
 404         u8 *buf;
 405
 406         bool is_tx;
 407
 408         /* for writing tx buffer */
 409         struct spi_message tx_buf_msg;
 410         u8 tx_header[1];
 411         /* burst buffer write command */
 412         struct spi_transfer tx_xfer_header;
 413         u8 tx_len[1];
 414         /* len of tx packet */
 415         struct spi_transfer tx_xfer_len;
 416         /* data of tx packet */
 417         struct spi_transfer tx_xfer_buf;
 418         struct sk_buff *tx_skb;
 419
 420         /* for read length rxfifo */
 421         struct spi_message reg_msg;
 422         u8 reg_cmd[1];
 423         u8 reg_data[MCR20A_IRQSTS_NUM];
 424         struct spi_transfer reg_xfer_cmd;
 425         struct spi_transfer reg_xfer_data;
 426
 427         /* receive handling */
 428         struct spi_message rx_buf_msg;
 429         u8 rx_header[1];
 430         struct spi_transfer rx_xfer_header;
 431         u8 rx_lqi[1];
 432         struct spi_transfer rx_xfer_lqi;
 433         u8 rx_buf[MCR20A_MAX_BUF];
 434         struct spi_transfer rx_xfer_buf;
 435
 436         /* isr handling for reading intstat */
 437         struct spi_message irq_msg;
 438         u8 irq_header[1];
 439         u8 irq_data[MCR20A_IRQSTS_NUM];
 440         struct spi_transfer irq_xfer_data;
 441         struct spi_transfer irq_xfer_header;
 442 };
 443
 444 static void
 445 mcr20a_write_tx_buf_complete(void *context)
 446 {
 447         struct mcr20a_local *lp = context;
 448         int ret;
 449
 450         dev_dbg(printdev(lp), "%s\n", __func__);
 451
 452         lp->reg_msg.complete = NULL;
 453         lp->reg_cmd[0]  = MCR20A_WRITE_REG(DAR_PHY_CTRL1);
 454         lp->reg_data[0] = MCR20A_XCVSEQ_TX;
 455         lp->reg_xfer_data.len = 1;
 456
 457         ret = spi_async(lp->spi, &lp->reg_msg);
 458         if (ret)
 459                 dev_err(printdev(lp), "failed to set SEQ TX\n");
 460 }
 461
 462 static int
 463 mcr20a_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
 464 {
 465         struct mcr20a_local *lp = hw->priv;
 466
 467         dev_dbg(printdev(lp), "%s\n", __func__);
 468
 469         lp->tx_skb = skb;
 470
 471         print_hex_dump_debug("mcr20a tx: ", DUMP_PREFIX_OFFSET, 16, 1,
 472                              skb->data, skb->len, 0);
 473
 474         lp->is_tx = 1;
 475
 476         lp->reg_msg.complete    = NULL;
 477         lp->reg_cmd[0]          = MCR20A_WRITE_REG(DAR_PHY_CTRL1);
 478         lp->reg_data[0]         = MCR20A_XCVSEQ_IDLE;
 479         lp->reg_xfer_data.len   = 1;
 480
 481         return spi_async(lp->spi, &lp->reg_msg);
 482 }
 483
 484 static int
 485 mcr20a_ed(struct ieee802154_hw *hw, u8 *level)
 486 {
 487         WARN_ON(!level);
 488         *level = 0xbe;
 489         return 0;
 490 }
 491
 492 static int
 493 mcr20a_set_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
 494 {
 495         struct mcr20a_local *lp = hw->priv;
 496         int ret;
 497
 498         dev_dbg(printdev(lp), "%s\n", __func__);
 499
 500         /* freqency = ((PLL_INT+64) + (PLL_FRAC/65536)) * 32 MHz */
 501         ret = regmap_write(lp->regmap_dar, DAR_PLL_INT0, PLL_INT[channel - 11]);
 502         if (ret)
 503                 return ret;
 504         ret = regmap_write(lp->regmap_dar, DAR_PLL_FRAC0_LSB, 0x00);
 505         if (ret)
 506                 return ret;
 507         ret = regmap_write(lp->regmap_dar, DAR_PLL_FRAC0_MSB,
 508                            PLL_FRAC[channel - 11]);
 509         if (ret)
 510                 return ret;
 511
 512         return 0;
 513 }
 514
 515 static int
 516 mcr20a_start(struct ieee802154_hw *hw)
 517 {
 518         struct mcr20a_local *lp = hw->priv;
 519         int ret;
 520
 521         dev_dbg(printdev(lp), "%s\n", __func__);
 522
 523         /* No slotted operation */
 524         dev_dbg(printdev(lp), "no slotted operation\n");
 525         ret = regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL1,
 526                                  DAR_PHY_CTRL1_SLOTTED, 0x0);
 527         if (ret < 0)
 528                 return ret;
 529
 530         /* enable irq */
 531         enable_irq(lp->spi->irq);
 532
 533         /* Unmask SEQ interrupt */
 534         ret = regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL2,
 535                                  DAR_PHY_CTRL2_SEQMSK, 0x0);
 536         if (ret < 0)
 537                 return ret;
 538
 539         /* Start the RX sequence */
 540         dev_dbg(printdev(lp), "start the RX sequence\n");
 541         ret = regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL1,
 542                                  DAR_PHY_CTRL1_XCVSEQ_MASK, MCR20A_XCVSEQ_RX);
 543         if (ret < 0)
 544                 return ret;
 545
 546         return 0;
 547 }
 548
 549 static void
 550 mcr20a_stop(struct ieee802154_hw *hw)
 551 {
 552         struct mcr20a_local *lp = hw->priv;
 553
 554         dev_dbg(printdev(lp), "%s\n", __func__);
 555
 556         /* stop all running sequence */
 557         regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL1,
 558                            DAR_PHY_CTRL1_XCVSEQ_MASK, MCR20A_XCVSEQ_IDLE);
 559
 560         /* disable irq */
 561         disable_irq(lp->spi->irq);
 562 }
 563
 564 static int
 565 mcr20a_set_hw_addr_filt(struct ieee802154_hw *hw,
 566                         struct ieee802154_hw_addr_filt *filt,
 567                         unsigned long changed)
 568 {
 569         struct mcr20a_local *lp = hw->priv;
 570
 571         dev_dbg(printdev(lp), "%s\n", __func__);
 572
 573         if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
 574                 u16 addr = le16_to_cpu(filt->short_addr);
 575
 576                 regmap_write(lp->regmap_iar, IAR_MACSHORTADDRS0_LSB, addr);
 577                 regmap_write(lp->regmap_iar, IAR_MACSHORTADDRS0_MSB, addr >> 8);
 578         }
 579
 580         if (changed & IEEE802154_AFILT_PANID_CHANGED) {
 581                 u16 pan = le16_to_cpu(filt->pan_id);
 582
 583                 regmap_write(lp->regmap_iar, IAR_MACPANID0_LSB, pan);
 584                 regmap_write(lp->regmap_iar, IAR_MACPANID0_MSB, pan >> 8);
 585         }
 586
 587         if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
 588                 u8 addr[8], i;
 589
 590                 memcpy(addr, &filt->ieee_addr, 8);
 591                 for (i = 0; i < 8; i++)
 592                         regmap_write(lp->regmap_iar,
 593                                      IAR_MACLONGADDRS0_0 + i, addr[i]);
 594         }
 595
 596         if (changed & IEEE802154_AFILT_PANC_CHANGED) {
 597                 if (filt->pan_coord) {
 598                         regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL4,
 599                                            DAR_PHY_CTRL4_PANCORDNTR0, 0x10);
 600                 } else {
 601                         regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL4,
 602                                            DAR_PHY_CTRL4_PANCORDNTR0, 0x00);
 603                 }
 604         }
 605
 606         return 0;
 607 }
 608
 609 /* -30 dBm to 10 dBm */
 610 #define MCR20A_MAX_TX_POWERS 0x14
 611 static const s32 mcr20a_powers[MCR20A_MAX_TX_POWERS + 1] = {
 612         -3000, -2800, -2600, -2400, -2200, -2000, -1800, -1600, -1400,
 613         -1200, -1000, -800, -600, -400, -200, 0, 200, 400, 600, 800, 1000
 614 };
 615
 616 static int
 617 mcr20a_set_txpower(struct ieee802154_hw *hw, s32 mbm)
 618 {
 619         struct mcr20a_local *lp = hw->priv;
 620         u32 i;
 621
 622         dev_dbg(printdev(lp), "%s(%d)\n", __func__, mbm);
 623
 624         for (i = 0; i < lp->hw->phy->supported.tx_powers_size; i++) {
 625                 if (lp->hw->phy->supported.tx_powers[i] == mbm)
 626                         return regmap_write(lp->regmap_dar, DAR_PA_PWR,
 627                                             ((i + 8) & 0x1F));
 628         }
 629
 630         return -EINVAL;
 631 }
 632
 633 #define MCR20A_MAX_ED_LEVELS MCR20A_MIN_CCA_THRESHOLD
 634 static s32 mcr20a_ed_levels[MCR20A_MAX_ED_LEVELS + 1];
 635
 636 static int
 637 mcr20a_set_cca_mode(struct ieee802154_hw *hw,
 638                     const struct wpan_phy_cca *cca)
 639 {
 640         struct mcr20a_local *lp = hw->priv;
 641         unsigned int cca_mode = 0xff;
 642         bool cca_mode_and = false;
 643         int ret;
 644
 645         dev_dbg(printdev(lp), "%s\n", __func__);
 646
 647         /* mapping 802.15.4 to driver spec */
 648         switch (cca->mode) {
 649         case NL802154_CCA_ENERGY:
 650                 cca_mode = MCR20A_CCA_MODE1;
 651                 break;
 652         case NL802154_CCA_CARRIER:
 653                 cca_mode = MCR20A_CCA_MODE2;
 654                 break;
 655         case NL802154_CCA_ENERGY_CARRIER:
 656                 switch (cca->opt) {
 657                 case NL802154_CCA_OPT_ENERGY_CARRIER_AND:
 658                         cca_mode = MCR20A_CCA_MODE3;
 659                         cca_mode_and = true;
 660                         break;
 661                 case NL802154_CCA_OPT_ENERGY_CARRIER_OR:
 662                         cca_mode = MCR20A_CCA_MODE3;
 663                         cca_mode_and = false;
 664                         break;
 665                 default:
 666                         return -EINVAL;
 667                 }
 668                 break;
 669         default:
 670                 return -EINVAL;
 671         }
 672         ret = regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL4,
 673                                  DAR_PHY_CTRL4_CCATYPE_MASK,
 674                                  cca_mode << DAR_PHY_CTRL4_CCATYPE_SHIFT);
 675         if (ret < 0)
 676                 return ret;
 677
 678         if (cca_mode == MCR20A_CCA_MODE3) {
 679                 if (cca_mode_and) {
 680                         ret = regmap_update_bits(lp->regmap_iar, IAR_CCA_CTRL,
 681                                                  IAR_CCA_CTRL_CCA3_AND_NOT_OR,
 682                                                  0x08);
 683                 } else {
 684                         ret = regmap_update_bits(lp->regmap_iar,
 685                                                  IAR_CCA_CTRL,
 686                                                  IAR_CCA_CTRL_CCA3_AND_NOT_OR,
 687                                                  0x00);
 688                 }
 689                 if (ret < 0)
 690                         return ret;
 691         }
 692
 693         return ret;
 694 }
 695
 696 static int
 697 mcr20a_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
 698 {
 699         struct mcr20a_local *lp = hw->priv;
 700         u32 i;
 701
 702         dev_dbg(printdev(lp), "%s\n", __func__);
 703
 704         for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) {
 705                 if (hw->phy->supported.cca_ed_levels[i] == mbm)
 706                         return regmap_write(lp->regmap_iar, IAR_CCA1_THRESH, i);
 707         }
 708
 709         return 0;
 710 }
 711
 712 static int
 713 mcr20a_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
 714 {
 715         struct mcr20a_local *lp = hw->priv;
 716         int ret;
 717         u8 rx_frame_filter_reg = 0x0;
 718
 719         dev_dbg(printdev(lp), "%s(%d)\n", __func__, on);
 720
 721         if (on) {
 722                 /* All frame types accepted*/
 723                 rx_frame_filter_reg &= ~(IAR_RX_FRAME_FLT_FRM_VER);
 724                 rx_frame_filter_reg |= (IAR_RX_FRAME_FLT_ACK_FT |
 725                                   IAR_RX_FRAME_FLT_NS_FT);
 726
 727                 ret = regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL4,
 728                                          DAR_PHY_CTRL4_PROMISCUOUS,
 729                                          DAR_PHY_CTRL4_PROMISCUOUS);
 730                 if (ret < 0)
 731                         return ret;
 732
 733                 ret = regmap_write(lp->regmap_iar, IAR_RX_FRAME_FILTER,
 734                                    rx_frame_filter_reg);
 735                 if (ret < 0)
 736                         return ret;
 737         } else {
 738                 ret = regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL4,
 739                                          DAR_PHY_CTRL4_PROMISCUOUS, 0x0);
 740                 if (ret < 0)
 741                         return ret;
 742
 743                 ret = regmap_write(lp->regmap_iar, IAR_RX_FRAME_FILTER,
 744                                    IAR_RX_FRAME_FLT_FRM_VER |
 745                                    IAR_RX_FRAME_FLT_BEACON_FT |
 746                                    IAR_RX_FRAME_FLT_DATA_FT |
 747                                    IAR_RX_FRAME_FLT_CMD_FT);
 748                 if (ret < 0)
 749                         return ret;
 750         }
 751
 752         return 0;
 753 }
 754
 755 static const struct ieee802154_ops mcr20a_hw_ops = {
 756         .owner                  = THIS_MODULE,
 757         .xmit_async             = mcr20a_xmit,
 758         .ed                     = mcr20a_ed,
 759         .set_channel            = mcr20a_set_channel,
 760         .start                  = mcr20a_start,
 761         .stop                   = mcr20a_stop,
 762         .set_hw_addr_filt       = mcr20a_set_hw_addr_filt,
 763         .set_txpower            = mcr20a_set_txpower,
 764         .set_cca_mode           = mcr20a_set_cca_mode,
 765         .set_cca_ed_level       = mcr20a_set_cca_ed_level,
 766         .set_promiscuous_mode   = mcr20a_set_promiscuous_mode,
 767 };
 768
 769 static int
 770 mcr20a_request_rx(struct mcr20a_local *lp)
 771 {
 772         dev_dbg(printdev(lp), "%s\n", __func__);
 773
 774         /* Start the RX sequence */
 775         regmap_update_bits_async(lp->regmap_dar, DAR_PHY_CTRL1,
 776                                  DAR_PHY_CTRL1_XCVSEQ_MASK, MCR20A_XCVSEQ_RX);
 777
 778         return 0;
 779 }
 780
 781 static void
 782 mcr20a_handle_rx_read_buf_complete(void *context)
 783 {
 784         struct mcr20a_local *lp = context;
 785         u8 len = lp->reg_data[0] & DAR_RX_FRAME_LENGTH_MASK;
 786         struct sk_buff *skb;
 787
 788         dev_dbg(printdev(lp), "%s\n", __func__);
 789
 790         dev_dbg(printdev(lp), "RX is done\n");
 791
 792         if (!ieee802154_is_valid_psdu_len(len)) {
 793                 dev_vdbg(&lp->spi->dev, "corrupted frame received\n");
 794                 len = IEEE802154_MTU;
 795         }
 796
 797         len = len - 2;  /* get rid of frame check field */
 798
 799         skb = dev_alloc_skb(len);
 800         if (!skb)
 801                 return;
 802
 803         __skb_put_data(skb, lp->rx_buf, len);
 804         ieee802154_rx_irqsafe(lp->hw, skb, lp->rx_lqi[0]);
 805
 806         print_hex_dump_debug("mcr20a rx: ", DUMP_PREFIX_OFFSET, 16, 1,
 807                              lp->rx_buf, len, 0);
 808         pr_debug("mcr20a rx: lqi: %02hhx\n", lp->rx_lqi[0]);
 809
 810         /* start RX sequence */
 811         mcr20a_request_rx(lp);
 812 }
 813
 814 static void
 815 mcr20a_handle_rx_read_len_complete(void *context)
 816 {
 817         struct mcr20a_local *lp = context;
 818         u8 len;
 819         int ret;
 820
 821         dev_dbg(printdev(lp), "%s\n", __func__);
 822
 823         /* get the length of received frame */
 824         len = lp->reg_data[0] & DAR_RX_FRAME_LENGTH_MASK;
 825         dev_dbg(printdev(lp), "frame len : %d\n", len);
 826
 827         /* prepare to read the rx buf */
 828         lp->rx_buf_msg.complete = mcr20a_handle_rx_read_buf_complete;
 829         lp->rx_header[0] = MCR20A_BURST_READ_PACKET_BUF;
 830         lp->rx_xfer_buf.len = len;
 831
 832         ret = spi_async(lp->spi, &lp->rx_buf_msg);
 833         if (ret)
 834                 dev_err(printdev(lp), "failed to read rx buffer length\n");
 835 }
 836
 837 static int
 838 mcr20a_handle_rx(struct mcr20a_local *lp)
 839 {
 840         dev_dbg(printdev(lp), "%s\n", __func__);
 841         lp->reg_msg.complete = mcr20a_handle_rx_read_len_complete;
 842         lp->reg_cmd[0] = MCR20A_READ_REG(DAR_RX_FRM_LEN);
 843         lp->reg_xfer_data.len   = 1;
 844
 845         return spi_async(lp->spi, &lp->reg_msg);
 846 }
 847
 848 static int
 849 mcr20a_handle_tx_complete(struct mcr20a_local *lp)
 850 {
 851         dev_dbg(printdev(lp), "%s\n", __func__);
 852
 853         ieee802154_xmit_complete(lp->hw, lp->tx_skb, false);
 854
 855         return mcr20a_request_rx(lp);
 856 }
 857
 858 static int
 859 mcr20a_handle_tx(struct mcr20a_local *lp)
 860 {
 861         int ret;
 862
 863         dev_dbg(printdev(lp), "%s\n", __func__);
 864
 865         /* write tx buffer */
 866         lp->tx_header[0]        = MCR20A_BURST_WRITE_PACKET_BUF;
 867         /* add 2 bytes of FCS */
 868         lp->tx_len[0]           = lp->tx_skb->len + 2;
 869         lp->tx_xfer_buf.tx_buf  = lp->tx_skb->data;
 870         /* add 1 byte psduLength */
 871         lp->tx_xfer_buf.len     = lp->tx_skb->len + 1;
 872
 873         ret = spi_async(lp->spi, &lp->tx_buf_msg);
 874         if (ret) {
 875                 dev_err(printdev(lp), "SPI write Failed for TX buf\n");
 876                 return ret;
 877         }
 878
 879         return 0;
 880 }
 881
 882 static void
 883 mcr20a_irq_clean_complete(void *context)
 884 {
 885         struct mcr20a_local *lp = context;
 886         u8 seq_state = lp->irq_data[DAR_IRQ_STS1] & DAR_PHY_CTRL1_XCVSEQ_MASK;
 887
 888         dev_dbg(printdev(lp), "%s\n", __func__);
 889
 890         enable_irq(lp->spi->irq);
 891
 892         dev_dbg(printdev(lp), "IRQ STA1 (%02x) STA2 (%02x)\n",
 893                 lp->irq_data[DAR_IRQ_STS1], lp->irq_data[DAR_IRQ_STS2]);
 894
 895         switch (seq_state) {
 896         /* TX IRQ, RX IRQ and SEQ IRQ */
 897         case (DAR_IRQSTS1_TXIRQ | DAR_IRQSTS1_SEQIRQ):
 898                 if (lp->is_tx) {
 899                         lp->is_tx = 0;
 900                         dev_dbg(printdev(lp), "TX is done. No ACK\n");
 901                         mcr20a_handle_tx_complete(lp);
 902                 }
 903                 break;
 904         case (DAR_IRQSTS1_RXIRQ | DAR_IRQSTS1_SEQIRQ):
 905                 /* rx is starting */
 906                 dev_dbg(printdev(lp), "RX is starting\n");
 907                 mcr20a_handle_rx(lp);
 908                 break;
 909         case (DAR_IRQSTS1_RXIRQ | DAR_IRQSTS1_TXIRQ | DAR_IRQSTS1_SEQIRQ):
 910                 if (lp->is_tx) {
 911                         /* tx is done */
 912                         lp->is_tx = 0;
 913                         dev_dbg(printdev(lp), "TX is done. Get ACK\n");
 914                         mcr20a_handle_tx_complete(lp);
 915                 } else {
 916                         /* rx is starting */
 917                         dev_dbg(printdev(lp), "RX is starting\n");
 918                         mcr20a_handle_rx(lp);
 919                 }
 920                 break;
 921         case (DAR_IRQSTS1_SEQIRQ):
 922                 if (lp->is_tx) {
 923                         dev_dbg(printdev(lp), "TX is starting\n");
 924                         mcr20a_handle_tx(lp);
 925                 } else {
 926                         dev_dbg(printdev(lp), "MCR20A is stop\n");
 927                 }
 928                 break;
 929         }
 930 }
 931
 932 static void mcr20a_irq_status_complete(void *context)
 933 {
 934         int ret;
 935         struct mcr20a_local *lp = context;
 936
 937         dev_dbg(printdev(lp), "%s\n", __func__);
 938         regmap_update_bits_async(lp->regmap_dar, DAR_PHY_CTRL1,
 939                                  DAR_PHY_CTRL1_XCVSEQ_MASK, MCR20A_XCVSEQ_IDLE);
 940
 941         lp->reg_msg.complete = mcr20a_irq_clean_complete;
 942         lp->reg_cmd[0] = MCR20A_WRITE_REG(DAR_IRQ_STS1);
 943         memcpy(lp->reg_data, lp->irq_data, MCR20A_IRQSTS_NUM);
 944         lp->reg_xfer_data.len = MCR20A_IRQSTS_NUM;
 945
 946         ret = spi_async(lp->spi, &lp->reg_msg);
 947
 948         if (ret)
 949                 dev_err(printdev(lp), "failed to clean irq status\n");
 950 }
 951
 952 static irqreturn_t mcr20a_irq_isr(int irq, void *data)
 953 {
 954         struct mcr20a_local *lp = data;
 955         int ret;
 956
 957         disable_irq_nosync(irq);
 958
 959         lp->irq_header[0] = MCR20A_READ_REG(DAR_IRQ_STS1);
 960         /* read IRQSTSx */
 961         ret = spi_async(lp->spi, &lp->irq_msg);
 962         if (ret) {
 963                 enable_irq(irq);
 964                 return IRQ_NONE;
 965         }
 966
 967         return IRQ_HANDLED;
 968 }
 969
 970 static void mcr20a_hw_setup(struct mcr20a_local *lp)
 971 {
 972         u8 i;
 973         struct ieee802154_hw *hw = lp->hw;
 974         struct wpan_phy *phy = lp->hw->phy;
 975
 976         dev_dbg(printdev(lp), "%s\n", __func__);
 977
 978         phy->symbol_duration = 16;
 979         phy->lifs_period = 40;
 980         phy->sifs_period = 12;
 981
 982         hw->flags = IEEE802154_HW_TX_OMIT_CKSUM |
 983                         IEEE802154_HW_AFILT |
 984                         IEEE802154_HW_PROMISCUOUS;
 985
 986         phy->flags = WPAN_PHY_FLAG_TXPOWER | WPAN_PHY_FLAG_CCA_ED_LEVEL |
 987                         WPAN_PHY_FLAG_CCA_MODE;
 988
 989         phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY) |
 990                 BIT(NL802154_CCA_CARRIER) | BIT(NL802154_CCA_ENERGY_CARRIER);
 991         phy->supported.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND) |
 992                 BIT(NL802154_CCA_OPT_ENERGY_CARRIER_OR);
 993
 994         /* initiating cca_ed_levels */
 995         for (i = MCR20A_MAX_CCA_THRESHOLD; i < MCR20A_MIN_CCA_THRESHOLD + 1;
 996               ++i) {
 997                 mcr20a_ed_levels[i] =  -i * 100;
 998         }
 999
1000         phy->supported.cca_ed_levels = mcr20a_ed_levels;
1001         phy->supported.cca_ed_levels_size = ARRAY_SIZE(mcr20a_ed_levels);
1002
1003         phy->cca.mode = NL802154_CCA_ENERGY;
1004
1005         phy->supported.channels[0] = MCR20A_VALID_CHANNELS;
1006         phy->current_page = 0;
1007         /* MCR20A default reset value */
1008         phy->current_channel = 20;
1009         phy->symbol_duration = 16;
1010         phy->supported.tx_powers = mcr20a_powers;
1011         phy->supported.tx_powers_size = ARRAY_SIZE(mcr20a_powers);
1012         phy->cca_ed_level = phy->supported.cca_ed_levels[75];
1013         phy->transmit_power = phy->supported.tx_powers[0x0F];
1014 }
1015
1016 static void
1017 mcr20a_setup_tx_spi_messages(struct mcr20a_local *lp)
1018 {
1019         spi_message_init(&lp->tx_buf_msg);
1020         lp->tx_buf_msg.context = lp;
1021         lp->tx_buf_msg.complete = mcr20a_write_tx_buf_complete;
1022
1023         lp->tx_xfer_header.len = 1;
1024         lp->tx_xfer_header.tx_buf = lp->tx_header;
1025
1026         lp->tx_xfer_len.len = 1;
1027         lp->tx_xfer_len.tx_buf = lp->tx_len;
1028
1029         spi_message_add_tail(&lp->tx_xfer_header, &lp->tx_buf_msg);
1030         spi_message_add_tail(&lp->tx_xfer_len, &lp->tx_buf_msg);
1031         spi_message_add_tail(&lp->tx_xfer_buf, &lp->tx_buf_msg);
1032 }
1033
1034 static void
1035 mcr20a_setup_rx_spi_messages(struct mcr20a_local *lp)
1036 {
1037         spi_message_init(&lp->reg_msg);
1038         lp->reg_msg.context = lp;
1039
1040         lp->reg_xfer_cmd.len = 1;
1041         lp->reg_xfer_cmd.tx_buf = lp->reg_cmd;
1042         lp->reg_xfer_cmd.rx_buf = lp->reg_cmd;
1043
1044         lp->reg_xfer_data.rx_buf = lp->reg_data;
1045         lp->reg_xfer_data.tx_buf = lp->reg_data;
1046
1047         spi_message_add_tail(&lp->reg_xfer_cmd, &lp->reg_msg);
1048         spi_message_add_tail(&lp->reg_xfer_data, &lp->reg_msg);
1049
1050         spi_message_init(&lp->rx_buf_msg);
1051         lp->rx_buf_msg.context = lp;
1052         lp->rx_buf_msg.complete = mcr20a_handle_rx_read_buf_complete;
1053         lp->rx_xfer_header.len = 1;
1054         lp->rx_xfer_header.tx_buf = lp->rx_header;
1055         lp->rx_xfer_header.rx_buf = lp->rx_header;
1056
1057         lp->rx_xfer_buf.rx_buf = lp->rx_buf;
1058
1059         lp->rx_xfer_lqi.len = 1;
1060         lp->rx_xfer_lqi.rx_buf = lp->rx_lqi;
1061
1062         spi_message_add_tail(&lp->rx_xfer_header, &lp->rx_buf_msg);
1063         spi_message_add_tail(&lp->rx_xfer_buf, &lp->rx_buf_msg);
1064         spi_message_add_tail(&lp->rx_xfer_lqi, &lp->rx_buf_msg);
1065 }
1066
1067 static void
1068 mcr20a_setup_irq_spi_messages(struct mcr20a_local *lp)
1069 {
1070         spi_message_init(&lp->irq_msg);
1071         lp->irq_msg.context             = lp;
1072         lp->irq_msg.complete    = mcr20a_irq_status_complete;
1073         lp->irq_xfer_header.len = 1;
1074         lp->irq_xfer_header.tx_buf = lp->irq_header;
1075         lp->irq_xfer_header.rx_buf = lp->irq_header;
1076
1077         lp->irq_xfer_data.len   = MCR20A_IRQSTS_NUM;
1078         lp->irq_xfer_data.rx_buf = lp->irq_data;
1079
1080         spi_message_add_tail(&lp->irq_xfer_header, &lp->irq_msg);
1081         spi_message_add_tail(&lp->irq_xfer_data, &lp->irq_msg);
1082 }
1083
1084 static int
1085 mcr20a_phy_init(struct mcr20a_local *lp)
1086 {
1087         u8 index;
1088         unsigned int phy_reg = 0;
1089         int ret;
1090
1091         dev_dbg(printdev(lp), "%s\n", __func__);
1092
1093         /* Disable Tristate on COCO MISO for SPI reads */
1094         ret = regmap_write(lp->regmap_iar, IAR_MISC_PAD_CTRL, 0x02);
1095         if (ret)
1096                 goto err_ret;
1097
1098         /* Clear all PP IRQ bits in IRQSTS1 to avoid unexpected interrupts
1099          * immediately after init
1100          */
1101         ret = regmap_write(lp->regmap_dar, DAR_IRQ_STS1, 0xEF);
1102         if (ret)
1103                 goto err_ret;
1104
1105         /* Clear all PP IRQ bits in IRQSTS2 */
1106         ret = regmap_write(lp->regmap_dar, DAR_IRQ_STS2,
1107                            DAR_IRQSTS2_ASM_IRQ | DAR_IRQSTS2_PB_ERR_IRQ |
1108                            DAR_IRQSTS2_WAKE_IRQ);
1109         if (ret)
1110                 goto err_ret;
1111
1112         /* Disable all timer interrupts */
1113         ret = regmap_write(lp->regmap_dar, DAR_IRQ_STS3, 0xFF);
1114         if (ret)
1115                 goto err_ret;
1116
1117         /*  PHY_CTRL1 : default HW settings + AUTOACK enabled */
1118         ret = regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL1,
1119                                  DAR_PHY_CTRL1_AUTOACK, DAR_PHY_CTRL1_AUTOACK);
1120
1121         /*  PHY_CTRL2 : disable all interrupts */
1122         ret = regmap_write(lp->regmap_dar, DAR_PHY_CTRL2, 0xFF);
1123         if (ret)
1124                 goto err_ret;
1125
1126         /* PHY_CTRL3 : disable all timers and remaining interrupts */
1127         ret = regmap_write(lp->regmap_dar, DAR_PHY_CTRL3,
1128                            DAR_PHY_CTRL3_ASM_MSK | DAR_PHY_CTRL3_PB_ERR_MSK |
1129                            DAR_PHY_CTRL3_WAKE_MSK);
1130         if (ret)
1131                 goto err_ret;
1132
1133         /* SRC_CTRL : enable Acknowledge Frame Pending and
1134          * Source Address Matching Enable
1135          */
1136         ret = regmap_write(lp->regmap_dar, DAR_SRC_CTRL,
1137                            DAR_SRC_CTRL_ACK_FRM_PND |
1138                            (DAR_SRC_CTRL_INDEX << DAR_SRC_CTRL_INDEX_SHIFT));
1139         if (ret)
1140                 goto err_ret;
1141
1142         /*  RX_FRAME_FILTER */
1143         /*  FRM_VER[1:0] = b11. Accept FrameVersion 0 and 1 packets */
1144         ret = regmap_write(lp->regmap_iar, IAR_RX_FRAME_FILTER,
1145                            IAR_RX_FRAME_FLT_FRM_VER |
1146                            IAR_RX_FRAME_FLT_BEACON_FT |
1147                            IAR_RX_FRAME_FLT_DATA_FT |
1148                            IAR_RX_FRAME_FLT_CMD_FT);
1149         if (ret)
1150                 goto err_ret;
1151
1152         dev_info(printdev(lp), "MCR20A DAR overwrites version: 0x%02x\n",
1153                  MCR20A_OVERWRITE_VERSION);
1154
1155         /* Overwrites direct registers  */
1156         ret = regmap_write(lp->regmap_dar, DAR_OVERWRITE_VER,
1157                            MCR20A_OVERWRITE_VERSION);
1158         if (ret)
1159                 goto err_ret;
1160
1161         /* Overwrites indirect registers  */
1162         ret = regmap_multi_reg_write(lp->regmap_iar, mar20a_iar_overwrites,
1163                                      ARRAY_SIZE(mar20a_iar_overwrites));
1164         if (ret)
1165                 goto err_ret;
1166
1167         /* Clear HW indirect queue */
1168         dev_dbg(printdev(lp), "clear HW indirect queue\n");
1169         for (index = 0; index < MCR20A_PHY_INDIRECT_QUEUE_SIZE; index++) {
1170                 phy_reg = (u8)(((index & DAR_SRC_CTRL_INDEX) <<
1171                                DAR_SRC_CTRL_INDEX_SHIFT)
1172                               | (DAR_SRC_CTRL_SRCADDR_EN)
1173                               | (DAR_SRC_CTRL_INDEX_DISABLE));
1174                 ret = regmap_write(lp->regmap_dar, DAR_SRC_CTRL, phy_reg);
1175                 if (ret)
1176                         goto err_ret;
1177                 phy_reg = 0;
1178         }
1179
1180         /* Assign HW Indirect hash table to PAN0 */
1181         ret = regmap_read(lp->regmap_iar, IAR_DUAL_PAN_CTRL, &phy_reg);
1182         if (ret)
1183                 goto err_ret;
1184
1185         /* Clear current lvl */
1186         phy_reg &= ~IAR_DUAL_PAN_CTRL_DUAL_PAN_SAM_LVL_MSK;
1187
1188         /* Set new lvl */
1189         phy_reg |= MCR20A_PHY_INDIRECT_QUEUE_SIZE <<
1190                 IAR_DUAL_PAN_CTRL_DUAL_PAN_SAM_LVL_SHIFT;
1191         ret = regmap_write(lp->regmap_iar, IAR_DUAL_PAN_CTRL, phy_reg);
1192         if (ret)
1193                 goto err_ret;
1194
1195         /* Set CCA threshold to -75 dBm */
1196         ret = regmap_write(lp->regmap_iar, IAR_CCA1_THRESH, 0x4B);
1197         if (ret)
1198                 goto err_ret;
1199
1200         /* Set prescaller to obtain 1 symbol (16us) timebase */
1201         ret = regmap_write(lp->regmap_iar, IAR_TMR_PRESCALE, 0x05);
1202         if (ret)
1203                 goto err_ret;
1204
1205         /* Enable autodoze mode. */
1206         ret = regmap_update_bits(lp->regmap_dar, DAR_PWR_MODES,
1207                                  DAR_PWR_MODES_AUTODOZE,
1208                                  DAR_PWR_MODES_AUTODOZE);
1209         if (ret)
1210                 goto err_ret;
1211
1212         /* Disable clk_out */
1213         ret = regmap_update_bits(lp->regmap_dar, DAR_CLK_OUT_CTRL,
1214                                  DAR_CLK_OUT_CTRL_EN, 0x0);
1215         if (ret)
1216                 goto err_ret;
1217
1218         return 0;
1219
1220 err_ret:
1221         return ret;
1222 }
1223
1224 static int
1225 mcr20a_probe(struct spi_device *spi)
1226 {
1227         struct ieee802154_hw *hw;
1228         struct mcr20a_local *lp;
1229         struct gpio_desc *rst_b;
1230         int irq_type;
1231         int ret = -ENOMEM;
1232
1233         dev_dbg(&spi->dev, "%s\n", __func__);
1234
1235         if (!spi->irq) {
1236                 dev_err(&spi->dev, "no IRQ specified\n");
1237                 return -EINVAL;
1238         }
1239
1240         rst_b = devm_gpiod_get(&spi->dev, "rst_b", GPIOD_OUT_HIGH);
1241         if (IS_ERR(rst_b)) {
1242                 ret = PTR_ERR(rst_b);
1243                 if (ret != -EPROBE_DEFER)
1244                         dev_err(&spi->dev, "Failed to get 'rst_b' gpio: %d", ret);
1245                 return ret;
1246         }
1247
1248         /* reset mcr20a */
1249         usleep_range(10, 20);
1250         gpiod_set_value_cansleep(rst_b, 1);
1251         usleep_range(10, 20);
1252         gpiod_set_value_cansleep(rst_b, 0);
1253         usleep_range(120, 240);
1254
1255         /* allocate ieee802154_hw and private data */
1256         hw = ieee802154_alloc_hw(sizeof(*lp), &mcr20a_hw_ops);
1257         if (!hw) {
1258                 dev_crit(&spi->dev, "ieee802154_alloc_hw failed\n");
1259                 return ret;
1260         }
1261
1262         /* init mcr20a local data */
1263         lp = hw->priv;
1264         lp->hw = hw;
1265         lp->spi = spi;
1266
1267         /* init ieee802154_hw */
1268         hw->parent = &spi->dev;
1269         ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
1270
1271         /* init buf */
1272         lp->buf = devm_kzalloc(&spi->dev, SPI_COMMAND_BUFFER, GFP_KERNEL);
1273
1274         if (!lp->buf) {
1275                 ret = -ENOMEM;
1276                 goto free_dev;
1277         }
1278
1279         mcr20a_setup_tx_spi_messages(lp);
1280         mcr20a_setup_rx_spi_messages(lp);
1281         mcr20a_setup_irq_spi_messages(lp);
1282
1283         /* setup regmap */
1284         lp->regmap_dar = devm_regmap_init_spi(spi, &mcr20a_dar_regmap);
1285         if (IS_ERR(lp->regmap_dar)) {
1286                 ret = PTR_ERR(lp->regmap_dar);
1287                 dev_err(&spi->dev, "Failed to allocate dar map: %d\n",
1288                         ret);
1289                 goto free_dev;
1290         }
1291
1292         lp->regmap_iar = devm_regmap_init_spi(spi, &mcr20a_iar_regmap);
1293         if (IS_ERR(lp->regmap_iar)) {
1294                 ret = PTR_ERR(lp->regmap_iar);
1295                 dev_err(&spi->dev, "Failed to allocate iar map: %d\n", ret);
1296                 goto free_dev;
1297         }
1298
1299         mcr20a_hw_setup(lp);
1300
1301         spi_set_drvdata(spi, lp);
1302
1303         ret = mcr20a_phy_init(lp);
1304         if (ret < 0) {
1305                 dev_crit(&spi->dev, "mcr20a_phy_init failed\n");
1306                 goto free_dev;
1307         }
1308
1309         irq_type = irq_get_trigger_type(spi->irq);
1310         if (!irq_type)
1311                 irq_type = IRQF_TRIGGER_FALLING;
1312
1313         ret = devm_request_irq(&spi->dev, spi->irq, mcr20a_irq_isr,
1314                                irq_type, dev_name(&spi->dev), lp);
1315         if (ret) {
1316                 dev_err(&spi->dev, "could not request_irq for mcr20a\n");
1317                 ret = -ENODEV;
1318                 goto free_dev;
1319         }
1320
1321         /* disable_irq by default and wait for starting hardware */
1322         disable_irq(spi->irq);
1323
1324         ret = ieee802154_register_hw(hw);
1325         if (ret) {
1326                 dev_crit(&spi->dev, "ieee802154_register_hw failed\n");
1327                 goto free_dev;
1328         }
1329
1330         return ret;
1331
1332 free_dev:
1333         ieee802154_free_hw(lp->hw);
1334
1335         return ret;
1336 }
1337
1338 static int mcr20a_remove(struct spi_device *spi)
1339 {
1340         struct mcr20a_local *lp = spi_get_drvdata(spi);
1341
1342         dev_dbg(&spi->dev, "%s\n", __func__);
1343
1344         ieee802154_unregister_hw(lp->hw);
1345         ieee802154_free_hw(lp->hw);
1346
1347         return 0;
1348 }
1349
1350 static const struct of_device_id mcr20a_of_match[] = {
1351         { .compatible = "nxp,mcr20a", },
1352         { },
1353 };
1354 MODULE_DEVICE_TABLE(of, mcr20a_of_match);
1355
1356 static const struct spi_device_id mcr20a_device_id[] = {
1357         { .name = "mcr20a", },
1358         { },
1359 };
1360 MODULE_DEVICE_TABLE(spi, mcr20a_device_id);
1361
1362 static struct spi_driver mcr20a_driver = {
1363         .id_table = mcr20a_device_id,
1364         .driver = {
1365                 .of_match_table = of_match_ptr(mcr20a_of_match),
1366                 .name   = "mcr20a",
1367         },
1368         .probe      = mcr20a_probe,
1369         .remove     = mcr20a_remove,
1370 };
1371
1372 module_spi_driver(mcr20a_driver);
1373
1374 MODULE_DESCRIPTION("MCR20A Transceiver Driver");
1375 MODULE_LICENSE("GPL v2");
1376 MODULE_AUTHOR("Xue Liu <liuxuenetmail@gmail>");