drivers/net/ieee802154/at86rf230.c

   1 /*
   2  * AT86RF230/RF231 driver
   3  *
   4  * Copyright (C) 2009-2012 Siemens AG
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Written by:
  20  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
  21  * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
  22  */
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/gpio.h>
  27 #include <linux/delay.h>
  28 #include <linux/mutex.h>
  29 #include <linux/workqueue.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/spi/spi.h>
  32 #include <linux/spi/at86rf230.h>
  33 #include <linux/skbuff.h>
  34
  35 #include <net/mac802154.h>
  36 #include <net/wpan-phy.h>
  37
  38 struct at86rf230_local {
  39         struct spi_device *spi;
  40
  41         u8 part;
  42         u8 vers;
  43
  44         u8 buf[2];
  45         struct mutex bmux;
  46
  47         struct work_struct irqwork;
  48         struct completion tx_complete;
  49
  50         struct ieee802154_dev *dev;
  51
  52         spinlock_t lock;
  53         bool irq_busy;
  54         bool is_tx;
  55 };
  56
  57 static inline int is_rf212(struct at86rf230_local *local)
  58 {
  59         return local->part == 7;
  60 }
  61
  62 #define RG_TRX_STATUS   (0x01)
  63 #define SR_TRX_STATUS           0x01, 0x1f, 0
  64 #define SR_RESERVED_01_3        0x01, 0x20, 5
  65 #define SR_CCA_STATUS           0x01, 0x40, 6
  66 #define SR_CCA_DONE             0x01, 0x80, 7
  67 #define RG_TRX_STATE    (0x02)
  68 #define SR_TRX_CMD              0x02, 0x1f, 0
  69 #define SR_TRAC_STATUS          0x02, 0xe0, 5
  70 #define RG_TRX_CTRL_0   (0x03)
  71 #define SR_CLKM_CTRL            0x03, 0x07, 0
  72 #define SR_CLKM_SHA_SEL         0x03, 0x08, 3
  73 #define SR_PAD_IO_CLKM          0x03, 0x30, 4
  74 #define SR_PAD_IO               0x03, 0xc0, 6
  75 #define RG_TRX_CTRL_1   (0x04)
  76 #define SR_IRQ_POLARITY         0x04, 0x01, 0
  77 #define SR_IRQ_MASK_MODE        0x04, 0x02, 1
  78 #define SR_SPI_CMD_MODE         0x04, 0x0c, 2
  79 #define SR_RX_BL_CTRL           0x04, 0x10, 4
  80 #define SR_TX_AUTO_CRC_ON       0x04, 0x20, 5
  81 #define SR_IRQ_2_EXT_EN         0x04, 0x40, 6
  82 #define SR_PA_EXT_EN            0x04, 0x80, 7
  83 #define RG_PHY_TX_PWR   (0x05)
  84 #define SR_TX_PWR               0x05, 0x0f, 0
  85 #define SR_PA_LT                0x05, 0x30, 4
  86 #define SR_PA_BUF_LT            0x05, 0xc0, 6
  87 #define RG_PHY_RSSI     (0x06)
  88 #define SR_RSSI                 0x06, 0x1f, 0
  89 #define SR_RND_VALUE            0x06, 0x60, 5
  90 #define SR_RX_CRC_VALID         0x06, 0x80, 7
  91 #define RG_PHY_ED_LEVEL (0x07)
  92 #define SR_ED_LEVEL             0x07, 0xff, 0
  93 #define RG_PHY_CC_CCA   (0x08)
  94 #define SR_CHANNEL              0x08, 0x1f, 0
  95 #define SR_CCA_MODE             0x08, 0x60, 5
  96 #define SR_CCA_REQUEST          0x08, 0x80, 7
  97 #define RG_CCA_THRES    (0x09)
  98 #define SR_CCA_ED_THRES         0x09, 0x0f, 0
  99 #define SR_RESERVED_09_1        0x09, 0xf0, 4
 100 #define RG_RX_CTRL      (0x0a)
 101 #define SR_PDT_THRES            0x0a, 0x0f, 0
 102 #define SR_RESERVED_0a_1        0x0a, 0xf0, 4
 103 #define RG_SFD_VALUE    (0x0b)
 104 #define SR_SFD_VALUE            0x0b, 0xff, 0
 105 #define RG_TRX_CTRL_2   (0x0c)
 106 #define SR_OQPSK_DATA_RATE      0x0c, 0x03, 0
 107 #define SR_SUB_MODE             0x0c, 0x04, 2
 108 #define SR_BPSK_QPSK            0x0c, 0x08, 3
 109 #define SR_OQPSK_SUB1_RC_EN     0x0c, 0x10, 4
 110 #define SR_RESERVED_0c_5        0x0c, 0x60, 5
 111 #define SR_RX_SAFE_MODE         0x0c, 0x80, 7
 112 #define RG_ANT_DIV      (0x0d)
 113 #define SR_ANT_CTRL             0x0d, 0x03, 0
 114 #define SR_ANT_EXT_SW_EN        0x0d, 0x04, 2
 115 #define SR_ANT_DIV_EN           0x0d, 0x08, 3
 116 #define SR_RESERVED_0d_2        0x0d, 0x70, 4
 117 #define SR_ANT_SEL              0x0d, 0x80, 7
 118 #define RG_IRQ_MASK     (0x0e)
 119 #define SR_IRQ_MASK             0x0e, 0xff, 0
 120 #define RG_IRQ_STATUS   (0x0f)
 121 #define SR_IRQ_0_PLL_LOCK       0x0f, 0x01, 0
 122 #define SR_IRQ_1_PLL_UNLOCK     0x0f, 0x02, 1
 123 #define SR_IRQ_2_RX_START       0x0f, 0x04, 2
 124 #define SR_IRQ_3_TRX_END        0x0f, 0x08, 3
 125 #define SR_IRQ_4_CCA_ED_DONE    0x0f, 0x10, 4
 126 #define SR_IRQ_5_AMI            0x0f, 0x20, 5
 127 #define SR_IRQ_6_TRX_UR         0x0f, 0x40, 6
 128 #define SR_IRQ_7_BAT_LOW        0x0f, 0x80, 7
 129 #define RG_VREG_CTRL    (0x10)
 130 #define SR_RESERVED_10_6        0x10, 0x03, 0
 131 #define SR_DVDD_OK              0x10, 0x04, 2
 132 #define SR_DVREG_EXT            0x10, 0x08, 3
 133 #define SR_RESERVED_10_3        0x10, 0x30, 4
 134 #define SR_AVDD_OK              0x10, 0x40, 6
 135 #define SR_AVREG_EXT            0x10, 0x80, 7
 136 #define RG_BATMON       (0x11)
 137 #define SR_BATMON_VTH           0x11, 0x0f, 0
 138 #define SR_BATMON_HR            0x11, 0x10, 4
 139 #define SR_BATMON_OK            0x11, 0x20, 5
 140 #define SR_RESERVED_11_1        0x11, 0xc0, 6
 141 #define RG_XOSC_CTRL    (0x12)
 142 #define SR_XTAL_TRIM            0x12, 0x0f, 0
 143 #define SR_XTAL_MODE            0x12, 0xf0, 4
 144 #define RG_RX_SYN       (0x15)
 145 #define SR_RX_PDT_LEVEL         0x15, 0x0f, 0
 146 #define SR_RESERVED_15_2        0x15, 0x70, 4
 147 #define SR_RX_PDT_DIS           0x15, 0x80, 7
 148 #define RG_XAH_CTRL_1   (0x17)
 149 #define SR_RESERVED_17_8        0x17, 0x01, 0
 150 #define SR_AACK_PROM_MODE       0x17, 0x02, 1
 151 #define SR_AACK_ACK_TIME        0x17, 0x04, 2
 152 #define SR_RESERVED_17_5        0x17, 0x08, 3
 153 #define SR_AACK_UPLD_RES_FT     0x17, 0x10, 4
 154 #define SR_AACK_FLTR_RES_FT     0x17, 0x20, 5
 155 #define SR_CSMA_LBT_MODE        0x17, 0x40, 6
 156 #define SR_RESERVED_17_1        0x17, 0x80, 7
 157 #define RG_FTN_CTRL     (0x18)
 158 #define SR_RESERVED_18_2        0x18, 0x7f, 0
 159 #define SR_FTN_START            0x18, 0x80, 7
 160 #define RG_PLL_CF       (0x1a)
 161 #define SR_RESERVED_1a_2        0x1a, 0x7f, 0
 162 #define SR_PLL_CF_START         0x1a, 0x80, 7
 163 #define RG_PLL_DCU      (0x1b)
 164 #define SR_RESERVED_1b_3        0x1b, 0x3f, 0
 165 #define SR_RESERVED_1b_2        0x1b, 0x40, 6
 166 #define SR_PLL_DCU_START        0x1b, 0x80, 7
 167 #define RG_PART_NUM     (0x1c)
 168 #define SR_PART_NUM             0x1c, 0xff, 0
 169 #define RG_VERSION_NUM  (0x1d)
 170 #define SR_VERSION_NUM          0x1d, 0xff, 0
 171 #define RG_MAN_ID_0     (0x1e)
 172 #define SR_MAN_ID_0             0x1e, 0xff, 0
 173 #define RG_MAN_ID_1     (0x1f)
 174 #define SR_MAN_ID_1             0x1f, 0xff, 0
 175 #define RG_SHORT_ADDR_0 (0x20)
 176 #define SR_SHORT_ADDR_0         0x20, 0xff, 0
 177 #define RG_SHORT_ADDR_1 (0x21)
 178 #define SR_SHORT_ADDR_1         0x21, 0xff, 0
 179 #define RG_PAN_ID_0     (0x22)
 180 #define SR_PAN_ID_0             0x22, 0xff, 0
 181 #define RG_PAN_ID_1     (0x23)
 182 #define SR_PAN_ID_1             0x23, 0xff, 0
 183 #define RG_IEEE_ADDR_0  (0x24)
 184 #define SR_IEEE_ADDR_0          0x24, 0xff, 0
 185 #define RG_IEEE_ADDR_1  (0x25)
 186 #define SR_IEEE_ADDR_1          0x25, 0xff, 0
 187 #define RG_IEEE_ADDR_2  (0x26)
 188 #define SR_IEEE_ADDR_2          0x26, 0xff, 0
 189 #define RG_IEEE_ADDR_3  (0x27)
 190 #define SR_IEEE_ADDR_3          0x27, 0xff, 0
 191 #define RG_IEEE_ADDR_4  (0x28)
 192 #define SR_IEEE_ADDR_4          0x28, 0xff, 0
 193 #define RG_IEEE_ADDR_5  (0x29)
 194 #define SR_IEEE_ADDR_5          0x29, 0xff, 0
 195 #define RG_IEEE_ADDR_6  (0x2a)
 196 #define SR_IEEE_ADDR_6          0x2a, 0xff, 0
 197 #define RG_IEEE_ADDR_7  (0x2b)
 198 #define SR_IEEE_ADDR_7          0x2b, 0xff, 0
 199 #define RG_XAH_CTRL_0   (0x2c)
 200 #define SR_SLOTTED_OPERATION    0x2c, 0x01, 0
 201 #define SR_MAX_CSMA_RETRIES     0x2c, 0x0e, 1
 202 #define SR_MAX_FRAME_RETRIES    0x2c, 0xf0, 4
 203 #define RG_CSMA_SEED_0  (0x2d)
 204 #define SR_CSMA_SEED_0          0x2d, 0xff, 0
 205 #define RG_CSMA_SEED_1  (0x2e)
 206 #define SR_CSMA_SEED_1          0x2e, 0x07, 0
 207 #define SR_AACK_I_AM_COORD      0x2e, 0x08, 3
 208 #define SR_AACK_DIS_ACK         0x2e, 0x10, 4
 209 #define SR_AACK_SET_PD          0x2e, 0x20, 5
 210 #define SR_AACK_FVN_MODE        0x2e, 0xc0, 6
 211 #define RG_CSMA_BE      (0x2f)
 212 #define SR_MIN_BE               0x2f, 0x0f, 0
 213 #define SR_MAX_BE               0x2f, 0xf0, 4
 214
 215 #define CMD_REG         0x80
 216 #define CMD_REG_MASK    0x3f
 217 #define CMD_WRITE       0x40
 218 #define CMD_FB          0x20
 219
 220 #define IRQ_BAT_LOW     (1 << 7)
 221 #define IRQ_TRX_UR      (1 << 6)
 222 #define IRQ_AMI         (1 << 5)
 223 #define IRQ_CCA_ED      (1 << 4)
 224 #define IRQ_TRX_END     (1 << 3)
 225 #define IRQ_RX_START    (1 << 2)
 226 #define IRQ_PLL_UNL     (1 << 1)
 227 #define IRQ_PLL_LOCK    (1 << 0)
 228
 229 #define IRQ_ACTIVE_HIGH 0
 230 #define IRQ_ACTIVE_LOW  1
 231
 232 #define STATE_P_ON              0x00    /* BUSY */
 233 #define STATE_BUSY_RX           0x01
 234 #define STATE_BUSY_TX           0x02
 235 #define STATE_FORCE_TRX_OFF     0x03
 236 #define STATE_FORCE_TX_ON       0x04    /* IDLE */
 237 /* 0x05 */                              /* INVALID_PARAMETER */
 238 #define STATE_RX_ON             0x06
 239 /* 0x07 */                              /* SUCCESS */
 240 #define STATE_TRX_OFF           0x08
 241 #define STATE_TX_ON             0x09
 242 /* 0x0a - 0x0e */                       /* 0x0a - UNSUPPORTED_ATTRIBUTE */
 243 #define STATE_SLEEP             0x0F
 244 #define STATE_BUSY_RX_AACK      0x11
 245 #define STATE_BUSY_TX_ARET      0x12
 246 #define STATE_RX_AACK_ON        0x16
 247 #define STATE_TX_ARET_ON        0x19
 248 #define STATE_RX_ON_NOCLK       0x1C
 249 #define STATE_RX_AACK_ON_NOCLK  0x1D
 250 #define STATE_BUSY_RX_AACK_NOCLK 0x1E
 251 #define STATE_TRANSITION_IN_PROGRESS 0x1F
 252
 253 static int
 254 __at86rf230_detect_device(struct spi_device *spi, u16 *man_id, u8 *part,
 255                 u8 *version)
 256 {
 257         u8 data[4];
 258         u8 *buf = kmalloc(2, GFP_KERNEL);
 259         int status;
 260         struct spi_message msg;
 261         struct spi_transfer xfer = {
 262                 .len    = 2,
 263                 .tx_buf = buf,
 264                 .rx_buf = buf,
 265         };
 266         u8 reg;
 267
 268         if (!buf)
 269                 return -ENOMEM;
 270
 271         for (reg = RG_PART_NUM; reg <= RG_MAN_ID_1; reg++) {
 272                 buf[0] = (reg & CMD_REG_MASK) | CMD_REG;
 273                 buf[1] = 0xff;
 274                 dev_vdbg(&spi->dev, "buf[0] = %02x\n", buf[0]);
 275                 spi_message_init(&msg);
 276                 spi_message_add_tail(&xfer, &msg);
 277
 278                 status = spi_sync(spi, &msg);
 279                 dev_vdbg(&spi->dev, "status = %d\n", status);
 280                 if (msg.status)
 281                         status = msg.status;
 282
 283                 dev_vdbg(&spi->dev, "status = %d\n", status);
 284                 dev_vdbg(&spi->dev, "buf[0] = %02x\n", buf[0]);
 285                 dev_vdbg(&spi->dev, "buf[1] = %02x\n", buf[1]);
 286
 287                 if (status == 0)
 288                         data[reg - RG_PART_NUM] = buf[1];
 289                 else
 290                         break;
 291         }
 292
 293         if (status == 0) {
 294                 *part = data[0];
 295                 *version = data[1];
 296                 *man_id = (data[3] << 8) | data[2];
 297         }
 298
 299         kfree(buf);
 300
 301         return status;
 302 }
 303
 304 static int
 305 __at86rf230_write(struct at86rf230_local *lp, u8 addr, u8 data)
 306 {
 307         u8 *buf = lp->buf;
 308         int status;
 309         struct spi_message msg;
 310         struct spi_transfer xfer = {
 311                 .len    = 2,
 312                 .tx_buf = buf,
 313         };
 314
 315         buf[0] = (addr & CMD_REG_MASK) | CMD_REG | CMD_WRITE;
 316         buf[1] = data;
 317         dev_vdbg(&lp->spi->dev, "buf[0] = %02x\n", buf[0]);
 318         dev_vdbg(&lp->spi->dev, "buf[1] = %02x\n", buf[1]);
 319         spi_message_init(&msg);
 320         spi_message_add_tail(&xfer, &msg);
 321
 322         status = spi_sync(lp->spi, &msg);
 323         dev_vdbg(&lp->spi->dev, "status = %d\n", status);
 324         if (msg.status)
 325                 status = msg.status;
 326
 327         dev_vdbg(&lp->spi->dev, "status = %d\n", status);
 328         dev_vdbg(&lp->spi->dev, "buf[0] = %02x\n", buf[0]);
 329         dev_vdbg(&lp->spi->dev, "buf[1] = %02x\n", buf[1]);
 330
 331         return status;
 332 }
 333
 334 static int
 335 __at86rf230_read_subreg(struct at86rf230_local *lp,
 336                         u8 addr, u8 mask, int shift, u8 *data)
 337 {
 338         u8 *buf = lp->buf;
 339         int status;
 340         struct spi_message msg;
 341         struct spi_transfer xfer = {
 342                 .len    = 2,
 343                 .tx_buf = buf,
 344                 .rx_buf = buf,
 345         };
 346
 347         buf[0] = (addr & CMD_REG_MASK) | CMD_REG;
 348         buf[1] = 0xff;
 349         dev_vdbg(&lp->spi->dev, "buf[0] = %02x\n", buf[0]);
 350         spi_message_init(&msg);
 351         spi_message_add_tail(&xfer, &msg);
 352
 353         status = spi_sync(lp->spi, &msg);
 354         dev_vdbg(&lp->spi->dev, "status = %d\n", status);
 355         if (msg.status)
 356                 status = msg.status;
 357
 358         dev_vdbg(&lp->spi->dev, "status = %d\n", status);
 359         dev_vdbg(&lp->spi->dev, "buf[0] = %02x\n", buf[0]);
 360         dev_vdbg(&lp->spi->dev, "buf[1] = %02x\n", buf[1]);
 361
 362         if (status == 0)
 363                 *data = buf[1];
 364
 365         return status;
 366 }
 367
 368 static int
 369 at86rf230_read_subreg(struct at86rf230_local *lp,
 370                       u8 addr, u8 mask, int shift, u8 *data)
 371 {
 372         int status;
 373
 374         mutex_lock(&lp->bmux);
 375         status = __at86rf230_read_subreg(lp, addr, mask, shift, data);
 376         mutex_unlock(&lp->bmux);
 377
 378         return status;
 379 }
 380
 381 static int
 382 at86rf230_write_subreg(struct at86rf230_local *lp,
 383                        u8 addr, u8 mask, int shift, u8 data)
 384 {
 385         int status;
 386         u8 val;
 387
 388         mutex_lock(&lp->bmux);
 389         status = __at86rf230_read_subreg(lp, addr, 0xff, 0, &val);
 390         if (status)
 391                 goto out;
 392
 393         val &= ~mask;
 394         val |= (data << shift) & mask;
 395
 396         status = __at86rf230_write(lp, addr, val);
 397 out:
 398         mutex_unlock(&lp->bmux);
 399
 400         return status;
 401 }
 402
 403 static int
 404 at86rf230_write_fbuf(struct at86rf230_local *lp, u8 *data, u8 len)
 405 {
 406         u8 *buf = lp->buf;
 407         int status;
 408         struct spi_message msg;
 409         struct spi_transfer xfer_head = {
 410                 .len            = 2,
 411                 .tx_buf         = buf,
 412
 413         };
 414         struct spi_transfer xfer_buf = {
 415                 .len            = len,
 416                 .tx_buf         = data,
 417         };
 418
 419         mutex_lock(&lp->bmux);
 420         buf[0] = CMD_WRITE | CMD_FB;
 421         buf[1] = len + 2; /* 2 bytes for CRC that isn't written */
 422
 423         dev_vdbg(&lp->spi->dev, "buf[0] = %02x\n", buf[0]);
 424         dev_vdbg(&lp->spi->dev, "buf[1] = %02x\n", buf[1]);
 425
 426         spi_message_init(&msg);
 427         spi_message_add_tail(&xfer_head, &msg);
 428         spi_message_add_tail(&xfer_buf, &msg);
 429
 430         status = spi_sync(lp->spi, &msg);
 431         dev_vdbg(&lp->spi->dev, "status = %d\n", status);
 432         if (msg.status)
 433                 status = msg.status;
 434
 435         dev_vdbg(&lp->spi->dev, "status = %d\n", status);
 436         dev_vdbg(&lp->spi->dev, "buf[0] = %02x\n", buf[0]);
 437         dev_vdbg(&lp->spi->dev, "buf[1] = %02x\n", buf[1]);
 438
 439         mutex_unlock(&lp->bmux);
 440         return status;
 441 }
 442
 443 static int
 444 at86rf230_read_fbuf(struct at86rf230_local *lp, u8 *data, u8 *len, u8 *lqi)
 445 {
 446         u8 *buf = lp->buf;
 447         int status;
 448         struct spi_message msg;
 449         struct spi_transfer xfer_head = {
 450                 .len            = 2,
 451                 .tx_buf         = buf,
 452                 .rx_buf         = buf,
 453         };
 454         struct spi_transfer xfer_head1 = {
 455                 .len            = 2,
 456                 .tx_buf         = buf,
 457                 .rx_buf         = buf,
 458         };
 459         struct spi_transfer xfer_buf = {
 460                 .len            = 0,
 461                 .rx_buf         = data,
 462         };
 463
 464         mutex_lock(&lp->bmux);
 465
 466         buf[0] = CMD_FB;
 467         buf[1] = 0x00;
 468
 469         spi_message_init(&msg);
 470         spi_message_add_tail(&xfer_head, &msg);
 471
 472         status = spi_sync(lp->spi, &msg);
 473         dev_vdbg(&lp->spi->dev, "status = %d\n", status);
 474
 475         xfer_buf.len = *(buf + 1) + 1;
 476         *len = buf[1];
 477
 478         buf[0] = CMD_FB;
 479         buf[1] = 0x00;
 480
 481         spi_message_init(&msg);
 482         spi_message_add_tail(&xfer_head1, &msg);
 483         spi_message_add_tail(&xfer_buf, &msg);
 484
 485         status = spi_sync(lp->spi, &msg);
 486
 487         if (msg.status)
 488                 status = msg.status;
 489
 490         dev_vdbg(&lp->spi->dev, "status = %d\n", status);
 491         dev_vdbg(&lp->spi->dev, "buf[0] = %02x\n", buf[0]);
 492         dev_vdbg(&lp->spi->dev, "buf[1] = %02x\n", buf[1]);
 493
 494         if (status) {
 495                 if (lqi && (*len > lp->buf[1]))
 496                         *lqi = data[lp->buf[1]];
 497         }
 498         mutex_unlock(&lp->bmux);
 499
 500         return status;
 501 }
 502
 503 static int
 504 at86rf230_ed(struct ieee802154_dev *dev, u8 *level)
 505 {
 506         might_sleep();
 507         BUG_ON(!level);
 508         *level = 0xbe;
 509         return 0;
 510 }
 511
 512 static int
 513 at86rf230_state(struct ieee802154_dev *dev, int state)
 514 {
 515         struct at86rf230_local *lp = dev->priv;
 516         int rc;
 517         u8 val;
 518         u8 desired_status;
 519
 520         might_sleep();
 521
 522         if (state == STATE_FORCE_TX_ON)
 523                 desired_status = STATE_TX_ON;
 524         else if (state == STATE_FORCE_TRX_OFF)
 525                 desired_status = STATE_TRX_OFF;
 526         else
 527                 desired_status = state;
 528
 529         do {
 530                 rc = at86rf230_read_subreg(lp, SR_TRX_STATUS, &val);
 531                 if (rc)
 532                         goto err;
 533         } while (val == STATE_TRANSITION_IN_PROGRESS);
 534
 535         if (val == desired_status)
 536                 return 0;
 537
 538         /* state is equal to phy states */
 539         rc = at86rf230_write_subreg(lp, SR_TRX_CMD, state);
 540         if (rc)
 541                 goto err;
 542
 543         do {
 544                 rc = at86rf230_read_subreg(lp, SR_TRX_STATUS, &val);
 545                 if (rc)
 546                         goto err;
 547         } while (val == STATE_TRANSITION_IN_PROGRESS);
 548
 549
 550         if (val == desired_status)
 551                 return 0;
 552
 553         pr_err("unexpected state change: %d, asked for %d\n", val, state);
 554         return -EBUSY;
 555
 556 err:
 557         pr_err("error: %d\n", rc);
 558         return rc;
 559 }
 560
 561 static int
 562 at86rf230_start(struct ieee802154_dev *dev)
 563 {
 564         struct at86rf230_local *lp = dev->priv;
 565         u8 rc;
 566
 567         rc = at86rf230_write_subreg(lp, SR_RX_SAFE_MODE, 1);
 568         if (rc)
 569                 return rc;
 570
 571         return at86rf230_state(dev, STATE_RX_AACK_ON);
 572 }
 573
 574 static void
 575 at86rf230_stop(struct ieee802154_dev *dev)
 576 {
 577         at86rf230_state(dev, STATE_FORCE_TRX_OFF);
 578 }
 579
 580 static int
 581 at86rf230_set_channel(struct at86rf230_local *lp, int page, int channel)
 582 {
 583         return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
 584 }
 585
 586 static int
 587 at86rf212_set_channel(struct at86rf230_local *lp, int page, int channel)
 588 {
 589         int rc;
 590
 591         if (channel == 0)
 592                 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 0);
 593         else
 594                 rc = at86rf230_write_subreg(lp, SR_SUB_MODE, 1);
 595         if (rc < 0)
 596                 return rc;
 597
 598         if (page == 0)
 599                 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 0);
 600         else
 601                 rc = at86rf230_write_subreg(lp, SR_BPSK_QPSK, 1);
 602         if (rc < 0)
 603                 return rc;
 604
 605         return at86rf230_write_subreg(lp, SR_CHANNEL, channel);
 606 }
 607
 608 static int
 609 at86rf230_channel(struct ieee802154_dev *dev, int page, int channel)
 610 {
 611         struct at86rf230_local *lp = dev->priv;
 612         int rc;
 613
 614         might_sleep();
 615
 616         if (page < 0 || page > 31 ||
 617             !(lp->dev->phy->channels_supported[page] & BIT(channel))) {
 618                 WARN_ON(1);
 619                 return -EINVAL;
 620         }
 621
 622         if (is_rf212(lp))
 623                 rc = at86rf212_set_channel(lp, page, channel);
 624         else
 625                 rc = at86rf230_set_channel(lp, page, channel);
 626         if (rc < 0)
 627                 return rc;
 628
 629         msleep(1); /* Wait for PLL */
 630         dev->phy->current_channel = channel;
 631         dev->phy->current_page = page;
 632
 633         return 0;
 634 }
 635
 636 static int
 637 at86rf230_xmit(struct ieee802154_dev *dev, struct sk_buff *skb)
 638 {
 639         struct at86rf230_local *lp = dev->priv;
 640         int rc;
 641         unsigned long flags;
 642
 643         spin_lock(&lp->lock);
 644         if  (lp->irq_busy) {
 645                 spin_unlock(&lp->lock);
 646                 return -EBUSY;
 647         }
 648         spin_unlock(&lp->lock);
 649
 650         might_sleep();
 651
 652         rc = at86rf230_state(dev, STATE_FORCE_TX_ON);
 653         if (rc)
 654                 goto err;
 655
 656         spin_lock_irqsave(&lp->lock, flags);
 657         lp->is_tx = 1;
 658         reinit_completion(&lp->tx_complete);
 659         spin_unlock_irqrestore(&lp->lock, flags);
 660
 661         rc = at86rf230_write_fbuf(lp, skb->data, skb->len);
 662         if (rc)
 663                 goto err_rx;
 664
 665         rc = at86rf230_write_subreg(lp, SR_TRX_CMD, STATE_BUSY_TX);
 666         if (rc)
 667                 goto err_rx;
 668
 669         rc = wait_for_completion_interruptible(&lp->tx_complete);
 670         if (rc < 0)
 671                 goto err_rx;
 672
 673         rc = at86rf230_start(dev);
 674
 675         return rc;
 676
 677 err_rx:
 678         at86rf230_start(dev);
 679 err:
 680         pr_err("error: %d\n", rc);
 681
 682         spin_lock_irqsave(&lp->lock, flags);
 683         lp->is_tx = 0;
 684         spin_unlock_irqrestore(&lp->lock, flags);
 685
 686         return rc;
 687 }
 688
 689 static int at86rf230_rx(struct at86rf230_local *lp)
 690 {
 691         u8 len = 128, lqi = 0;
 692         struct sk_buff *skb;
 693
 694         skb = alloc_skb(len, GFP_KERNEL);
 695
 696         if (!skb)
 697                 return -ENOMEM;
 698
 699         if (at86rf230_read_fbuf(lp, skb_put(skb, len), &len, &lqi))
 700                 goto err;
 701
 702         if (len < 2)
 703                 goto err;
 704
 705         skb_trim(skb, len - 2); /* We do not put CRC into the frame */
 706
 707         ieee802154_rx_irqsafe(lp->dev, skb, lqi);
 708
 709         dev_dbg(&lp->spi->dev, "READ_FBUF: %d %x\n", len, lqi);
 710
 711         return 0;
 712 err:
 713         pr_debug("received frame is too small\n");
 714
 715         kfree_skb(skb);
 716         return -EINVAL;
 717 }
 718
 719 static int
 720 at86rf230_set_hw_addr_filt(struct ieee802154_dev *dev,
 721                            struct ieee802154_hw_addr_filt *filt,
 722                            unsigned long changed)
 723 {
 724         struct at86rf230_local *lp = dev->priv;
 725
 726         if (changed & IEEE802515_AFILT_SADDR_CHANGED) {
 727                 dev_vdbg(&lp->spi->dev,
 728                         "at86rf230_set_hw_addr_filt called for saddr\n");
 729                 __at86rf230_write(lp, RG_SHORT_ADDR_0, filt->short_addr);
 730                 __at86rf230_write(lp, RG_SHORT_ADDR_1, filt->short_addr >> 8);
 731         }
 732
 733         if (changed & IEEE802515_AFILT_PANID_CHANGED) {
 734                 dev_vdbg(&lp->spi->dev,
 735                         "at86rf230_set_hw_addr_filt called for pan id\n");
 736                 __at86rf230_write(lp, RG_PAN_ID_0, filt->pan_id);
 737                 __at86rf230_write(lp, RG_PAN_ID_1, filt->pan_id >> 8);
 738         }
 739
 740         if (changed & IEEE802515_AFILT_IEEEADDR_CHANGED) {
 741                 dev_vdbg(&lp->spi->dev,
 742                         "at86rf230_set_hw_addr_filt called for IEEE addr\n");
 743                 at86rf230_write_subreg(lp, SR_IEEE_ADDR_0, filt->ieee_addr[7]);
 744                 at86rf230_write_subreg(lp, SR_IEEE_ADDR_1, filt->ieee_addr[6]);
 745                 at86rf230_write_subreg(lp, SR_IEEE_ADDR_2, filt->ieee_addr[5]);
 746                 at86rf230_write_subreg(lp, SR_IEEE_ADDR_3, filt->ieee_addr[4]);
 747                 at86rf230_write_subreg(lp, SR_IEEE_ADDR_4, filt->ieee_addr[3]);
 748                 at86rf230_write_subreg(lp, SR_IEEE_ADDR_5, filt->ieee_addr[2]);
 749                 at86rf230_write_subreg(lp, SR_IEEE_ADDR_6, filt->ieee_addr[1]);
 750                 at86rf230_write_subreg(lp, SR_IEEE_ADDR_7, filt->ieee_addr[0]);
 751         }
 752
 753         if (changed & IEEE802515_AFILT_PANC_CHANGED) {
 754                 dev_vdbg(&lp->spi->dev,
 755                         "at86rf230_set_hw_addr_filt called for panc change\n");
 756                 if (filt->pan_coord)
 757                         at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 1);
 758                 else
 759                         at86rf230_write_subreg(lp, SR_AACK_I_AM_COORD, 0);
 760         }
 761
 762         return 0;
 763 }
 764
 765 static int
 766 at86rf212_set_txpower(struct ieee802154_dev *dev, int db)
 767 {
 768         struct at86rf230_local *lp = dev->priv;
 769         int rc;
 770
 771         /* typical maximum output is 5dBm with RG_PHY_TX_PWR 0x60, lower five
 772          * bits decrease power in 1dB steps. 0x60 represents extra PA gain of
 773          * 0dB.
 774          * thus, supported values for db range from -26 to 5, for 31dB of
 775          * reduction to 0dB of reduction.
 776          */
 777         if (db > 5 || db < -26)
 778                 return -EINVAL;
 779
 780         db = -(db - 5);
 781
 782         rc = __at86rf230_write(lp, RG_PHY_TX_PWR, 0x60 | db);
 783         if (rc)
 784                 return rc;
 785
 786         return 0;
 787 }
 788
 789 static int
 790 at86rf212_set_lbt(struct ieee802154_dev *dev, bool on)
 791 {
 792         struct at86rf230_local *lp = dev->priv;
 793
 794         return at86rf230_write_subreg(lp, SR_CSMA_LBT_MODE, on);
 795 }
 796
 797 static struct ieee802154_ops at86rf230_ops = {
 798         .owner = THIS_MODULE,
 799         .xmit = at86rf230_xmit,
 800         .ed = at86rf230_ed,
 801         .set_channel = at86rf230_channel,
 802         .start = at86rf230_start,
 803         .stop = at86rf230_stop,
 804         .set_hw_addr_filt = at86rf230_set_hw_addr_filt,
 805 };
 806
 807 static struct ieee802154_ops at86rf212_ops = {
 808         .owner = THIS_MODULE,
 809         .xmit = at86rf230_xmit,
 810         .ed = at86rf230_ed,
 811         .set_channel = at86rf230_channel,
 812         .start = at86rf230_start,
 813         .stop = at86rf230_stop,
 814         .set_hw_addr_filt = at86rf230_set_hw_addr_filt,
 815         .set_txpower = at86rf212_set_txpower,
 816         .set_lbt = at86rf212_set_lbt,
 817 };
 818
 819 static void at86rf230_irqwork(struct work_struct *work)
 820 {
 821         struct at86rf230_local *lp =
 822                 container_of(work, struct at86rf230_local, irqwork);
 823         u8 status = 0, val;
 824         int rc;
 825         unsigned long flags;
 826
 827         rc = at86rf230_read_subreg(lp, RG_IRQ_STATUS, 0xff, 0, &val);
 828         status |= val;
 829
 830         status &= ~IRQ_PLL_LOCK; /* ignore */
 831         status &= ~IRQ_RX_START; /* ignore */
 832         status &= ~IRQ_AMI; /* ignore */
 833         status &= ~IRQ_TRX_UR; /* FIXME: possibly handle ???*/
 834
 835         if (status & IRQ_TRX_END) {
 836                 spin_lock_irqsave(&lp->lock, flags);
 837                 status &= ~IRQ_TRX_END;
 838                 if (lp->is_tx) {
 839                         lp->is_tx = 0;
 840                         spin_unlock_irqrestore(&lp->lock, flags);
 841                         complete(&lp->tx_complete);
 842                 } else {
 843                         spin_unlock_irqrestore(&lp->lock, flags);
 844                         at86rf230_rx(lp);
 845                 }
 846         }
 847
 848         spin_lock_irqsave(&lp->lock, flags);
 849         lp->irq_busy = 0;
 850         spin_unlock_irqrestore(&lp->lock, flags);
 851 }
 852
 853 static void at86rf230_irqwork_level(struct work_struct *work)
 854 {
 855         struct at86rf230_local *lp =
 856                 container_of(work, struct at86rf230_local, irqwork);
 857
 858         at86rf230_irqwork(work);
 859
 860         enable_irq(lp->spi->irq);
 861 }
 862
 863 static irqreturn_t at86rf230_isr(int irq, void *data)
 864 {
 865         struct at86rf230_local *lp = data;
 866
 867         spin_lock(&lp->lock);
 868         lp->irq_busy = 1;
 869         spin_unlock(&lp->lock);
 870
 871         schedule_work(&lp->irqwork);
 872
 873         return IRQ_HANDLED;
 874 }
 875
 876 static irqreturn_t at86rf230_isr_level(int irq, void *data)
 877 {
 878         disable_irq_nosync(irq);
 879
 880         return at86rf230_isr(irq, data);
 881 }
 882
 883 static int at86rf230_irq_polarity(struct at86rf230_local *lp, int pol)
 884 {
 885         return at86rf230_write_subreg(lp, SR_IRQ_POLARITY, pol);
 886 }
 887
 888 static int at86rf230_hw_init(struct at86rf230_local *lp)
 889 {
 890         struct at86rf230_platform_data *pdata = lp->spi->dev.platform_data;
 891         int rc, irq_pol;
 892         u8 status;
 893
 894         rc = at86rf230_read_subreg(lp, SR_TRX_STATUS, &status);
 895         if (rc)
 896                 return rc;
 897
 898         dev_info(&lp->spi->dev, "Status: %02x\n", status);
 899         if (status == STATE_P_ON) {
 900                 rc = at86rf230_write_subreg(lp, SR_TRX_CMD,
 901                                             STATE_FORCE_TRX_OFF);
 902                 if (rc)
 903                         return rc;
 904                 msleep(1);
 905                 rc = at86rf230_read_subreg(lp, SR_TRX_STATUS, &status);
 906                 if (rc)
 907                         return rc;
 908                 dev_info(&lp->spi->dev, "Status: %02x\n", status);
 909         }
 910
 911         /* configure irq polarity, defaults to high active */
 912         if (pdata->irq_type & (IRQF_TRIGGER_FALLING | IRQF_TRIGGER_LOW))
 913                 irq_pol = IRQ_ACTIVE_LOW;
 914         else
 915                 irq_pol = IRQ_ACTIVE_HIGH;
 916
 917         rc = at86rf230_irq_polarity(lp, irq_pol);
 918         if (rc)
 919                 return rc;
 920
 921         rc = at86rf230_write_subreg(lp, SR_IRQ_MASK, IRQ_TRX_END);
 922         if (rc)
 923                 return rc;
 924
 925         /* CLKM changes are applied immediately */
 926         rc = at86rf230_write_subreg(lp, SR_CLKM_SHA_SEL, 0x00);
 927         if (rc)
 928                 return rc;
 929
 930         /* Turn CLKM Off */
 931         rc = at86rf230_write_subreg(lp, SR_CLKM_CTRL, 0x00);
 932         if (rc)
 933                 return rc;
 934         /* Wait the next SLEEP cycle */
 935         msleep(100);
 936
 937         rc = at86rf230_write_subreg(lp, SR_TRX_CMD, STATE_TX_ON);
 938         if (rc)
 939                 return rc;
 940         msleep(1);
 941
 942         rc = at86rf230_read_subreg(lp, SR_TRX_STATUS, &status);
 943         if (rc)
 944                 return rc;
 945         dev_info(&lp->spi->dev, "Status: %02x\n", status);
 946
 947         rc = at86rf230_read_subreg(lp, SR_DVDD_OK, &status);
 948         if (rc)
 949                 return rc;
 950         if (!status) {
 951                 dev_err(&lp->spi->dev, "DVDD error\n");
 952                 return -EINVAL;
 953         }
 954
 955         rc = at86rf230_read_subreg(lp, SR_AVDD_OK, &status);
 956         if (rc)
 957                 return rc;
 958         if (!status) {
 959                 dev_err(&lp->spi->dev, "AVDD error\n");
 960                 return -EINVAL;
 961         }
 962
 963         return 0;
 964 }
 965
 966 static int at86rf230_probe(struct spi_device *spi)
 967 {
 968         struct at86rf230_platform_data *pdata;
 969         struct ieee802154_dev *dev;
 970         struct at86rf230_local *lp;
 971         u16 man_id = 0;
 972         u8 part = 0, version = 0, status;
 973         irq_handler_t irq_handler;
 974         work_func_t irq_worker;
 975         int rc;
 976         const char *chip;
 977         struct ieee802154_ops *ops = NULL;
 978
 979         if (!spi->irq) {
 980                 dev_err(&spi->dev, "no IRQ specified\n");
 981                 return -EINVAL;
 982         }
 983
 984         pdata = spi->dev.platform_data;
 985         if (!pdata) {
 986                 dev_err(&spi->dev, "no platform_data\n");
 987                 return -EINVAL;
 988         }
 989
 990         rc = gpio_request(pdata->rstn, "rstn");
 991         if (rc)
 992                 return rc;
 993
 994         if (gpio_is_valid(pdata->slp_tr)) {
 995                 rc = gpio_request(pdata->slp_tr, "slp_tr");
 996                 if (rc)
 997                         goto err_slp_tr;
 998         }
 999
1000         rc = gpio_direction_output(pdata->rstn, 1);
1001         if (rc)
1002                 goto err_gpio_dir;
1003
1004         if (gpio_is_valid(pdata->slp_tr)) {
1005                 rc = gpio_direction_output(pdata->slp_tr, 0);
1006                 if (rc)
1007                         goto err_gpio_dir;
1008         }
1009
1010         /* Reset */
1011         msleep(1);
1012         gpio_set_value(pdata->rstn, 0);
1013         msleep(1);
1014         gpio_set_value(pdata->rstn, 1);
1015         msleep(1);
1016
1017         rc = __at86rf230_detect_device(spi, &man_id, &part, &version);
1018         if (rc < 0)
1019                 goto err_gpio_dir;
1020
1021         if (man_id != 0x001f) {
1022                 dev_err(&spi->dev, "Non-Atmel dev found (MAN_ID %02x %02x)\n",
1023                         man_id >> 8, man_id & 0xFF);
1024                 rc = -EINVAL;
1025                 goto err_gpio_dir;
1026         }
1027
1028         switch (part) {
1029         case 2:
1030                 chip = "at86rf230";
1031                 /* FIXME: should be easy to support; */
1032                 break;
1033         case 3:
1034                 chip = "at86rf231";
1035                 ops = &at86rf230_ops;
1036                 break;
1037         case 7:
1038                 chip = "at86rf212";
1039                 if (version == 1)
1040                         ops = &at86rf212_ops;
1041                 break;
1042         default:
1043                 chip = "UNKNOWN";
1044                 break;
1045         }
1046
1047         dev_info(&spi->dev, "Detected %s chip version %d\n", chip, version);
1048         if (!ops) {
1049                 rc = -ENOTSUPP;
1050                 goto err_gpio_dir;
1051         }
1052
1053         dev = ieee802154_alloc_device(sizeof(*lp), ops);
1054         if (!dev) {
1055                 rc = -ENOMEM;
1056                 goto err_gpio_dir;
1057         }
1058
1059         lp = dev->priv;
1060         lp->dev = dev;
1061         lp->part = part;
1062         lp->vers = version;
1063
1064         lp->spi = spi;
1065
1066         dev->parent = &spi->dev;
1067         dev->extra_tx_headroom = 0;
1068         dev->flags = IEEE802154_HW_OMIT_CKSUM | IEEE802154_HW_AACK;
1069
1070         if (pdata->irq_type & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) {
1071                 irq_worker = at86rf230_irqwork;
1072                 irq_handler = at86rf230_isr;
1073         } else {
1074                 irq_worker = at86rf230_irqwork_level;
1075                 irq_handler = at86rf230_isr_level;
1076         }
1077
1078         mutex_init(&lp->bmux);
1079         INIT_WORK(&lp->irqwork, irq_worker);
1080         spin_lock_init(&lp->lock);
1081         init_completion(&lp->tx_complete);
1082
1083         spi_set_drvdata(spi, lp);
1084
1085         if (is_rf212(lp)) {
1086                 dev->phy->channels_supported[0] = 0x00007FF;
1087                 dev->phy->channels_supported[2] = 0x00007FF;
1088         } else {
1089                 dev->phy->channels_supported[0] = 0x7FFF800;
1090         }
1091
1092         rc = at86rf230_hw_init(lp);
1093         if (rc)
1094                 goto err_hw_init;
1095
1096         rc = request_irq(spi->irq, irq_handler,
1097                          IRQF_SHARED | pdata->irq_type,
1098                          dev_name(&spi->dev), lp);
1099         if (rc)
1100                 goto err_hw_init;
1101
1102         /* Read irq status register to reset irq line */
1103         rc = at86rf230_read_subreg(lp, RG_IRQ_STATUS, 0xff, 0, &status);
1104         if (rc)
1105                 goto err_irq;
1106
1107         rc = ieee802154_register_device(lp->dev);
1108         if (rc)
1109                 goto err_irq;
1110
1111         return rc;
1112
1113 err_irq:
1114         free_irq(spi->irq, lp);
1115 err_hw_init:
1116         flush_work(&lp->irqwork);
1117         spi_set_drvdata(spi, NULL);
1118         mutex_destroy(&lp->bmux);
1119         ieee802154_free_device(lp->dev);
1120
1121 err_gpio_dir:
1122         if (gpio_is_valid(pdata->slp_tr))
1123                 gpio_free(pdata->slp_tr);
1124 err_slp_tr:
1125         gpio_free(pdata->rstn);
1126         return rc;
1127 }
1128
1129 static int at86rf230_remove(struct spi_device *spi)
1130 {
1131         struct at86rf230_local *lp = spi_get_drvdata(spi);
1132         struct at86rf230_platform_data *pdata = spi->dev.platform_data;
1133
1134         ieee802154_unregister_device(lp->dev);
1135
1136         free_irq(spi->irq, lp);
1137         flush_work(&lp->irqwork);
1138
1139         if (gpio_is_valid(pdata->slp_tr))
1140                 gpio_free(pdata->slp_tr);
1141         gpio_free(pdata->rstn);
1142
1143         mutex_destroy(&lp->bmux);
1144         ieee802154_free_device(lp->dev);
1145
1146         dev_dbg(&spi->dev, "unregistered at86rf230\n");
1147         return 0;
1148 }
1149
1150 static struct spi_driver at86rf230_driver = {
1151         .driver = {
1152                 .name   = "at86rf230",
1153                 .owner  = THIS_MODULE,
1154         },
1155         .probe      = at86rf230_probe,
1156         .remove     = at86rf230_remove,
1157 };
1158
1159 module_spi_driver(at86rf230_driver);
1160
1161 MODULE_DESCRIPTION("AT86RF230 Transceiver Driver");
1162 MODULE_LICENSE("GPL v2");