1 /* 2 * Copyright 2013 Broadcom Corporation. 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <asm/io.h> 9 #include <asm/errno.h> 10 #include <asm/arch/sysmap.h> 11 #include <asm/kona-common/clk.h> 12 #include <i2c.h> 13 14 /* Hardware register offsets and field defintions */ 15 #define CS_OFFSET 0x00000020 16 #define CS_ACK_SHIFT 3 17 #define CS_ACK_MASK 0x00000008 18 #define CS_ACK_CMD_GEN_START 0x00000000 19 #define CS_ACK_CMD_GEN_RESTART 0x00000001 20 #define CS_CMD_SHIFT 1 21 #define CS_CMD_CMD_NO_ACTION 0x00000000 22 #define CS_CMD_CMD_START_RESTART 0x00000001 23 #define CS_CMD_CMD_STOP 0x00000002 24 #define CS_EN_SHIFT 0 25 #define CS_EN_CMD_ENABLE_BSC 0x00000001 26 27 #define TIM_OFFSET 0x00000024 28 #define TIM_PRESCALE_SHIFT 6 29 #define TIM_P_SHIFT 3 30 #define TIM_NO_DIV_SHIFT 2 31 #define TIM_DIV_SHIFT 0 32 33 #define DAT_OFFSET 0x00000028 34 35 #define TOUT_OFFSET 0x0000002c 36 37 #define TXFCR_OFFSET 0x0000003c 38 #define TXFCR_FIFO_FLUSH_MASK 0x00000080 39 #define TXFCR_FIFO_EN_MASK 0x00000040 40 41 #define IER_OFFSET 0x00000044 42 #define IER_READ_COMPLETE_INT_MASK 0x00000010 43 #define IER_I2C_INT_EN_MASK 0x00000008 44 #define IER_FIFO_INT_EN_MASK 0x00000002 45 #define IER_NOACK_EN_MASK 0x00000001 46 47 #define ISR_OFFSET 0x00000048 48 #define ISR_RESERVED_MASK 0xffffff60 49 #define ISR_CMDBUSY_MASK 0x00000080 50 #define ISR_READ_COMPLETE_MASK 0x00000010 51 #define ISR_SES_DONE_MASK 0x00000008 52 #define ISR_ERR_MASK 0x00000004 53 #define ISR_TXFIFOEMPTY_MASK 0x00000002 54 #define ISR_NOACK_MASK 0x00000001 55 56 #define CLKEN_OFFSET 0x0000004c 57 #define CLKEN_AUTOSENSE_OFF_MASK 0x00000080 58 #define CLKEN_M_SHIFT 4 59 #define CLKEN_N_SHIFT 1 60 #define CLKEN_CLKEN_MASK 0x00000001 61 62 #define FIFO_STATUS_OFFSET 0x00000054 63 #define FIFO_STATUS_RXFIFO_EMPTY_MASK 0x00000004 64 #define FIFO_STATUS_TXFIFO_EMPTY_MASK 0x00000010 65 66 #define HSTIM_OFFSET 0x00000058 67 #define HSTIM_HS_MODE_MASK 0x00008000 68 #define HSTIM_HS_HOLD_SHIFT 10 69 #define HSTIM_HS_HIGH_PHASE_SHIFT 5 70 #define HSTIM_HS_SETUP_SHIFT 0 71 72 #define PADCTL_OFFSET 0x0000005c 73 #define PADCTL_PAD_OUT_EN_MASK 0x00000004 74 75 #define RXFCR_OFFSET 0x00000068 76 #define RXFCR_NACK_EN_SHIFT 7 77 #define RXFCR_READ_COUNT_SHIFT 0 78 #define RXFIFORDOUT_OFFSET 0x0000006c 79 80 /* Locally used constants */ 81 #define MAX_RX_FIFO_SIZE 64U /* bytes */ 82 #define MAX_TX_FIFO_SIZE 64U /* bytes */ 83 84 #define I2C_TIMEOUT 100000 /* usecs */ 85 86 #define WAIT_INT_CHK 100 /* usecs */ 87 #if I2C_TIMEOUT % WAIT_INT_CHK 88 #error I2C_TIMEOUT must be a multiple of WAIT_INT_CHK 89 #endif 90 91 /* Operations that can be commanded to the controller */ 92 enum bcm_kona_cmd_t { 93 BCM_CMD_NOACTION = 0, 94 BCM_CMD_START, 95 BCM_CMD_RESTART, 96 BCM_CMD_STOP, 97 }; 98 99 enum bus_speed_index { 100 BCM_SPD_100K = 0, 101 BCM_SPD_400K, 102 BCM_SPD_1MHZ, 103 }; 104 105 /* Internal divider settings for standard mode, fast mode and fast mode plus */ 106 struct bus_speed_cfg { 107 uint8_t time_m; /* Number of cycles for setup time */ 108 uint8_t time_n; /* Number of cycles for hold time */ 109 uint8_t prescale; /* Prescale divider */ 110 uint8_t time_p; /* Timing coefficient */ 111 uint8_t no_div; /* Disable clock divider */ 112 uint8_t time_div; /* Post-prescale divider */ 113 }; 114 115 static const struct bus_speed_cfg std_cfg_table[] = { 116 [BCM_SPD_100K] = {0x01, 0x01, 0x03, 0x06, 0x00, 0x02}, 117 [BCM_SPD_400K] = {0x05, 0x01, 0x03, 0x05, 0x01, 0x02}, 118 [BCM_SPD_1MHZ] = {0x01, 0x01, 0x03, 0x01, 0x01, 0x03}, 119 }; 120 121 struct bcm_kona_i2c_dev { 122 void *base; 123 uint speed; 124 const struct bus_speed_cfg *std_cfg; 125 }; 126 127 /* Keep these two defines in sync */ 128 #define DEF_SPD 100000 129 #define DEF_SPD_ENUM BCM_SPD_100K 130 131 #define DEF_DEVICE(num) \ 132 {(void *)CONFIG_SYS_I2C_BASE##num, DEF_SPD, &std_cfg_table[DEF_SPD_ENUM]} 133 134 static struct bcm_kona_i2c_dev g_i2c_devs[CONFIG_SYS_MAX_I2C_BUS] = { 135 #ifdef CONFIG_SYS_I2C_BASE0 136 DEF_DEVICE(0), 137 #endif 138 #ifdef CONFIG_SYS_I2C_BASE1 139 DEF_DEVICE(1), 140 #endif 141 #ifdef CONFIG_SYS_I2C_BASE2 142 DEF_DEVICE(2), 143 #endif 144 #ifdef CONFIG_SYS_I2C_BASE3 145 DEF_DEVICE(3), 146 #endif 147 #ifdef CONFIG_SYS_I2C_BASE4 148 DEF_DEVICE(4), 149 #endif 150 #ifdef CONFIG_SYS_I2C_BASE5 151 DEF_DEVICE(5), 152 #endif 153 }; 154 155 #define I2C_M_TEN 0x0010 /* ten bit address */ 156 #define I2C_M_RD 0x0001 /* read data */ 157 #define I2C_M_NOSTART 0x4000 /* no restart between msgs */ 158 159 struct kona_i2c_msg { 160 uint16_t addr; 161 uint16_t flags; 162 uint16_t len; 163 uint8_t *buf; 164 }; 165 166 static void bcm_kona_i2c_send_cmd_to_ctrl(struct bcm_kona_i2c_dev *dev, 167 enum bcm_kona_cmd_t cmd) 168 { 169 debug("%s, %d\n", __func__, cmd); 170 171 switch (cmd) { 172 case BCM_CMD_NOACTION: 173 writel((CS_CMD_CMD_NO_ACTION << CS_CMD_SHIFT) | 174 (CS_EN_CMD_ENABLE_BSC << CS_EN_SHIFT), 175 dev->base + CS_OFFSET); 176 break; 177 178 case BCM_CMD_START: 179 writel((CS_ACK_CMD_GEN_START << CS_ACK_SHIFT) | 180 (CS_CMD_CMD_START_RESTART << CS_CMD_SHIFT) | 181 (CS_EN_CMD_ENABLE_BSC << CS_EN_SHIFT), 182 dev->base + CS_OFFSET); 183 break; 184 185 case BCM_CMD_RESTART: 186 writel((CS_ACK_CMD_GEN_RESTART << CS_ACK_SHIFT) | 187 (CS_CMD_CMD_START_RESTART << CS_CMD_SHIFT) | 188 (CS_EN_CMD_ENABLE_BSC << CS_EN_SHIFT), 189 dev->base + CS_OFFSET); 190 break; 191 192 case BCM_CMD_STOP: 193 writel((CS_CMD_CMD_STOP << CS_CMD_SHIFT) | 194 (CS_EN_CMD_ENABLE_BSC << CS_EN_SHIFT), 195 dev->base + CS_OFFSET); 196 break; 197 198 default: 199 printf("Unknown command %d\n", cmd); 200 } 201 } 202 203 static void bcm_kona_i2c_enable_clock(struct bcm_kona_i2c_dev *dev) 204 { 205 writel(readl(dev->base + CLKEN_OFFSET) | CLKEN_CLKEN_MASK, 206 dev->base + CLKEN_OFFSET); 207 } 208 209 static void bcm_kona_i2c_disable_clock(struct bcm_kona_i2c_dev *dev) 210 { 211 writel(readl(dev->base + CLKEN_OFFSET) & ~CLKEN_CLKEN_MASK, 212 dev->base + CLKEN_OFFSET); 213 } 214 215 /* Wait until at least one of the mask bit(s) are set */ 216 static unsigned long wait_for_int_timeout(struct bcm_kona_i2c_dev *dev, 217 unsigned long time_left, 218 uint32_t mask) 219 { 220 uint32_t status; 221 222 while (time_left) { 223 status = readl(dev->base + ISR_OFFSET); 224 225 if ((status & ~ISR_RESERVED_MASK) == 0) { 226 debug("Bogus I2C interrupt 0x%x\n", status); 227 continue; 228 } 229 230 /* Must flush the TX FIFO when NAK detected */ 231 if (status & ISR_NOACK_MASK) 232 writel(TXFCR_FIFO_FLUSH_MASK | TXFCR_FIFO_EN_MASK, 233 dev->base + TXFCR_OFFSET); 234 235 writel(status & ~ISR_RESERVED_MASK, dev->base + ISR_OFFSET); 236 237 if (status & mask) { 238 /* We are done since one of the mask bits are set */ 239 return time_left; 240 } 241 udelay(WAIT_INT_CHK); 242 time_left -= WAIT_INT_CHK; 243 } 244 return 0; 245 } 246 247 /* Send command to I2C bus */ 248 static int bcm_kona_send_i2c_cmd(struct bcm_kona_i2c_dev *dev, 249 enum bcm_kona_cmd_t cmd) 250 { 251 int rc = 0; 252 unsigned long time_left = I2C_TIMEOUT; 253 254 /* Send the command */ 255 bcm_kona_i2c_send_cmd_to_ctrl(dev, cmd); 256 257 /* Wait for transaction to finish or timeout */ 258 time_left = wait_for_int_timeout(dev, time_left, IER_I2C_INT_EN_MASK); 259 260 if (!time_left) { 261 printf("controller timed out\n"); 262 rc = -ETIMEDOUT; 263 } 264 265 /* Clear command */ 266 bcm_kona_i2c_send_cmd_to_ctrl(dev, BCM_CMD_NOACTION); 267 268 return rc; 269 } 270 271 /* Read a single RX FIFO worth of data from the i2c bus */ 272 static int bcm_kona_i2c_read_fifo_single(struct bcm_kona_i2c_dev *dev, 273 uint8_t *buf, unsigned int len, 274 unsigned int last_byte_nak) 275 { 276 unsigned long time_left = I2C_TIMEOUT; 277 278 /* Start the RX FIFO */ 279 writel((last_byte_nak << RXFCR_NACK_EN_SHIFT) | 280 (len << RXFCR_READ_COUNT_SHIFT), dev->base + RXFCR_OFFSET); 281 282 /* Wait for FIFO read to complete */ 283 time_left = 284 wait_for_int_timeout(dev, time_left, IER_READ_COMPLETE_INT_MASK); 285 286 if (!time_left) { 287 printf("RX FIFO time out\n"); 288 return -EREMOTEIO; 289 } 290 291 /* Read data from FIFO */ 292 for (; len > 0; len--, buf++) 293 *buf = readl(dev->base + RXFIFORDOUT_OFFSET); 294 295 return 0; 296 } 297 298 /* Read any amount of data using the RX FIFO from the i2c bus */ 299 static int bcm_kona_i2c_read_fifo(struct bcm_kona_i2c_dev *dev, 300 struct kona_i2c_msg *msg) 301 { 302 unsigned int bytes_to_read = MAX_RX_FIFO_SIZE; 303 unsigned int last_byte_nak = 0; 304 unsigned int bytes_read = 0; 305 int rc; 306 307 uint8_t *tmp_buf = msg->buf; 308 309 while (bytes_read < msg->len) { 310 if (msg->len - bytes_read <= MAX_RX_FIFO_SIZE) { 311 last_byte_nak = 1; /* NAK last byte of transfer */ 312 bytes_to_read = msg->len - bytes_read; 313 } 314 315 rc = bcm_kona_i2c_read_fifo_single(dev, tmp_buf, bytes_to_read, 316 last_byte_nak); 317 if (rc < 0) 318 return -EREMOTEIO; 319 320 bytes_read += bytes_to_read; 321 tmp_buf += bytes_to_read; 322 } 323 324 return 0; 325 } 326 327 /* Write a single byte of data to the i2c bus */ 328 static int bcm_kona_i2c_write_byte(struct bcm_kona_i2c_dev *dev, uint8_t data, 329 unsigned int nak_expected) 330 { 331 unsigned long time_left = I2C_TIMEOUT; 332 unsigned int nak_received; 333 334 /* Clear pending session done interrupt */ 335 writel(ISR_SES_DONE_MASK, dev->base + ISR_OFFSET); 336 337 /* Send one byte of data */ 338 writel(data, dev->base + DAT_OFFSET); 339 340 time_left = wait_for_int_timeout(dev, time_left, IER_I2C_INT_EN_MASK); 341 342 if (!time_left) { 343 debug("controller timed out\n"); 344 return -ETIMEDOUT; 345 } 346 347 nak_received = readl(dev->base + CS_OFFSET) & CS_ACK_MASK ? 1 : 0; 348 349 if (nak_received ^ nak_expected) { 350 debug("unexpected NAK/ACK\n"); 351 return -EREMOTEIO; 352 } 353 354 return 0; 355 } 356 357 /* Write a single TX FIFO worth of data to the i2c bus */ 358 static int bcm_kona_i2c_write_fifo_single(struct bcm_kona_i2c_dev *dev, 359 uint8_t *buf, unsigned int len) 360 { 361 int k; 362 unsigned long time_left = I2C_TIMEOUT; 363 unsigned int fifo_status; 364 365 /* Write data into FIFO */ 366 for (k = 0; k < len; k++) 367 writel(buf[k], (dev->base + DAT_OFFSET)); 368 369 /* Wait for FIFO to empty */ 370 do { 371 time_left = 372 wait_for_int_timeout(dev, time_left, 373 (IER_FIFO_INT_EN_MASK | 374 IER_NOACK_EN_MASK)); 375 fifo_status = readl(dev->base + FIFO_STATUS_OFFSET); 376 } while (time_left && !(fifo_status & FIFO_STATUS_TXFIFO_EMPTY_MASK)); 377 378 /* Check if there was a NAK */ 379 if (readl(dev->base + CS_OFFSET) & CS_ACK_MASK) { 380 printf("unexpected NAK\n"); 381 return -EREMOTEIO; 382 } 383 384 /* Check if a timeout occurred */ 385 if (!time_left) { 386 printf("completion timed out\n"); 387 return -EREMOTEIO; 388 } 389 390 return 0; 391 } 392 393 /* Write any amount of data using TX FIFO to the i2c bus */ 394 static int bcm_kona_i2c_write_fifo(struct bcm_kona_i2c_dev *dev, 395 struct kona_i2c_msg *msg) 396 { 397 unsigned int bytes_to_write = MAX_TX_FIFO_SIZE; 398 unsigned int bytes_written = 0; 399 int rc; 400 401 uint8_t *tmp_buf = msg->buf; 402 403 while (bytes_written < msg->len) { 404 if (msg->len - bytes_written <= MAX_TX_FIFO_SIZE) 405 bytes_to_write = msg->len - bytes_written; 406 407 rc = bcm_kona_i2c_write_fifo_single(dev, tmp_buf, 408 bytes_to_write); 409 if (rc < 0) 410 return -EREMOTEIO; 411 412 bytes_written += bytes_to_write; 413 tmp_buf += bytes_to_write; 414 } 415 416 return 0; 417 } 418 419 /* Send i2c address */ 420 static int bcm_kona_i2c_do_addr(struct bcm_kona_i2c_dev *dev, 421 struct kona_i2c_msg *msg) 422 { 423 unsigned char addr; 424 425 if (msg->flags & I2C_M_TEN) { 426 /* First byte is 11110XX0 where XX is upper 2 bits */ 427 addr = 0xf0 | ((msg->addr & 0x300) >> 7); 428 if (bcm_kona_i2c_write_byte(dev, addr, 0) < 0) 429 return -EREMOTEIO; 430 431 /* Second byte is the remaining 8 bits */ 432 addr = msg->addr & 0xff; 433 if (bcm_kona_i2c_write_byte(dev, addr, 0) < 0) 434 return -EREMOTEIO; 435 436 if (msg->flags & I2C_M_RD) { 437 /* For read, send restart command */ 438 if (bcm_kona_send_i2c_cmd(dev, BCM_CMD_RESTART) < 0) 439 return -EREMOTEIO; 440 441 /* Then re-send the first byte with the read bit set */ 442 addr = 0xf0 | ((msg->addr & 0x300) >> 7) | 0x01; 443 if (bcm_kona_i2c_write_byte(dev, addr, 0) < 0) 444 return -EREMOTEIO; 445 } 446 } else { 447 addr = msg->addr << 1; 448 449 if (msg->flags & I2C_M_RD) 450 addr |= 1; 451 452 if (bcm_kona_i2c_write_byte(dev, addr, 0) < 0) 453 return -EREMOTEIO; 454 } 455 456 return 0; 457 } 458 459 static void bcm_kona_i2c_enable_autosense(struct bcm_kona_i2c_dev *dev) 460 { 461 writel(readl(dev->base + CLKEN_OFFSET) & ~CLKEN_AUTOSENSE_OFF_MASK, 462 dev->base + CLKEN_OFFSET); 463 } 464 465 static void bcm_kona_i2c_config_timing(struct bcm_kona_i2c_dev *dev) 466 { 467 writel(readl(dev->base + HSTIM_OFFSET) & ~HSTIM_HS_MODE_MASK, 468 dev->base + HSTIM_OFFSET); 469 470 writel((dev->std_cfg->prescale << TIM_PRESCALE_SHIFT) | 471 (dev->std_cfg->time_p << TIM_P_SHIFT) | 472 (dev->std_cfg->no_div << TIM_NO_DIV_SHIFT) | 473 (dev->std_cfg->time_div << TIM_DIV_SHIFT), 474 dev->base + TIM_OFFSET); 475 476 writel((dev->std_cfg->time_m << CLKEN_M_SHIFT) | 477 (dev->std_cfg->time_n << CLKEN_N_SHIFT) | 478 CLKEN_CLKEN_MASK, dev->base + CLKEN_OFFSET); 479 } 480 481 /* Master transfer function */ 482 static int bcm_kona_i2c_xfer(struct bcm_kona_i2c_dev *dev, 483 struct kona_i2c_msg msgs[], int num) 484 { 485 struct kona_i2c_msg *pmsg; 486 int rc = 0; 487 int i; 488 489 /* Enable pad output */ 490 writel(0, dev->base + PADCTL_OFFSET); 491 492 /* Enable internal clocks */ 493 bcm_kona_i2c_enable_clock(dev); 494 495 /* Send start command */ 496 rc = bcm_kona_send_i2c_cmd(dev, BCM_CMD_START); 497 if (rc < 0) { 498 printf("Start command failed rc = %d\n", rc); 499 goto xfer_disable_pad; 500 } 501 502 /* Loop through all messages */ 503 for (i = 0; i < num; i++) { 504 pmsg = &msgs[i]; 505 506 /* Send restart for subsequent messages */ 507 if ((i != 0) && ((pmsg->flags & I2C_M_NOSTART) == 0)) { 508 rc = bcm_kona_send_i2c_cmd(dev, BCM_CMD_RESTART); 509 if (rc < 0) { 510 printf("restart cmd failed rc = %d\n", rc); 511 goto xfer_send_stop; 512 } 513 } 514 515 /* Send slave address */ 516 if (!(pmsg->flags & I2C_M_NOSTART)) { 517 rc = bcm_kona_i2c_do_addr(dev, pmsg); 518 if (rc < 0) { 519 debug("NAK from addr %2.2x msg#%d rc = %d\n", 520 pmsg->addr, i, rc); 521 goto xfer_send_stop; 522 } 523 } 524 525 /* Perform data transfer */ 526 if (pmsg->flags & I2C_M_RD) { 527 rc = bcm_kona_i2c_read_fifo(dev, pmsg); 528 if (rc < 0) { 529 printf("read failure\n"); 530 goto xfer_send_stop; 531 } 532 } else { 533 rc = bcm_kona_i2c_write_fifo(dev, pmsg); 534 if (rc < 0) { 535 printf("write failure"); 536 goto xfer_send_stop; 537 } 538 } 539 } 540 541 rc = num; 542 543 xfer_send_stop: 544 /* Send a STOP command */ 545 bcm_kona_send_i2c_cmd(dev, BCM_CMD_STOP); 546 547 xfer_disable_pad: 548 /* Disable pad output */ 549 writel(PADCTL_PAD_OUT_EN_MASK, dev->base + PADCTL_OFFSET); 550 551 /* Stop internal clock */ 552 bcm_kona_i2c_disable_clock(dev); 553 554 return rc; 555 } 556 557 static uint bcm_kona_i2c_assign_bus_speed(struct bcm_kona_i2c_dev *dev, 558 uint speed) 559 { 560 switch (speed) { 561 case 100000: 562 dev->std_cfg = &std_cfg_table[BCM_SPD_100K]; 563 break; 564 case 400000: 565 dev->std_cfg = &std_cfg_table[BCM_SPD_400K]; 566 break; 567 case 1000000: 568 dev->std_cfg = &std_cfg_table[BCM_SPD_1MHZ]; 569 break; 570 default: 571 printf("%d hz bus speed not supported\n", speed); 572 return -EINVAL; 573 } 574 dev->speed = speed; 575 return 0; 576 } 577 578 static void bcm_kona_i2c_init(struct bcm_kona_i2c_dev *dev) 579 { 580 /* Parse bus speed */ 581 bcm_kona_i2c_assign_bus_speed(dev, dev->speed); 582 583 /* Enable internal clocks */ 584 bcm_kona_i2c_enable_clock(dev); 585 586 /* Configure internal dividers */ 587 bcm_kona_i2c_config_timing(dev); 588 589 /* Disable timeout */ 590 writel(0, dev->base + TOUT_OFFSET); 591 592 /* Enable autosense */ 593 bcm_kona_i2c_enable_autosense(dev); 594 595 /* Enable TX FIFO */ 596 writel(TXFCR_FIFO_FLUSH_MASK | TXFCR_FIFO_EN_MASK, 597 dev->base + TXFCR_OFFSET); 598 599 /* Mask all interrupts */ 600 writel(0, dev->base + IER_OFFSET); 601 602 /* Clear all pending interrupts */ 603 writel(ISR_CMDBUSY_MASK | 604 ISR_READ_COMPLETE_MASK | 605 ISR_SES_DONE_MASK | 606 ISR_ERR_MASK | 607 ISR_TXFIFOEMPTY_MASK | ISR_NOACK_MASK, dev->base + ISR_OFFSET); 608 609 /* Enable the controller but leave it idle */ 610 bcm_kona_i2c_send_cmd_to_ctrl(dev, BCM_CMD_NOACTION); 611 612 /* Disable pad output */ 613 writel(PADCTL_PAD_OUT_EN_MASK, dev->base + PADCTL_OFFSET); 614 } 615 616 /* 617 * uboot layer 618 */ 619 struct bcm_kona_i2c_dev *kona_get_dev(struct i2c_adapter *adap) 620 { 621 return &g_i2c_devs[adap->hwadapnr]; 622 } 623 624 static void kona_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr) 625 { 626 struct bcm_kona_i2c_dev *dev = kona_get_dev(adap); 627 628 if (clk_bsc_enable(dev->base)) 629 return; 630 631 bcm_kona_i2c_init(dev); 632 } 633 634 static int kona_i2c_read(struct i2c_adapter *adap, uchar chip, uint addr, 635 int alen, uchar *buffer, int len) 636 { 637 /* msg[0] writes the addr, msg[1] reads the data */ 638 struct kona_i2c_msg msg[2]; 639 unsigned char msgbuf0[64]; 640 struct bcm_kona_i2c_dev *dev = kona_get_dev(adap); 641 642 msg[0].addr = chip; 643 msg[0].flags = 0; 644 msg[0].len = 1; 645 msg[0].buf = msgbuf0; /* msgbuf0 contains incrementing reg addr */ 646 647 msg[1].addr = chip; 648 msg[1].flags = I2C_M_RD; 649 /* msg[1].buf dest ptr increments each read */ 650 651 msgbuf0[0] = (unsigned char)addr; 652 msg[1].buf = buffer; 653 msg[1].len = len; 654 if (bcm_kona_i2c_xfer(dev, msg, 2) < 0) { 655 /* Sending 2 i2c messages */ 656 kona_i2c_init(adap, adap->speed, adap->slaveaddr); 657 debug("I2C read: I/O error\n"); 658 return -EIO; 659 } 660 return 0; 661 } 662 663 static int kona_i2c_write(struct i2c_adapter *adap, uchar chip, uint addr, 664 int alen, uchar *buffer, int len) 665 { 666 struct kona_i2c_msg msg[1]; 667 unsigned char msgbuf0[64]; 668 unsigned int i; 669 struct bcm_kona_i2c_dev *dev = kona_get_dev(adap); 670 671 msg[0].addr = chip; 672 msg[0].flags = 0; 673 msg[0].len = 2; /* addr byte plus data */ 674 msg[0].buf = msgbuf0; 675 676 for (i = 0; i < len; i++) { 677 msgbuf0[0] = addr++; 678 msgbuf0[1] = buffer[i]; 679 if (bcm_kona_i2c_xfer(dev, msg, 1) < 0) { 680 kona_i2c_init(adap, adap->speed, adap->slaveaddr); 681 debug("I2C write: I/O error\n"); 682 return -EIO; 683 } 684 } 685 return 0; 686 } 687 688 static int kona_i2c_probe(struct i2c_adapter *adap, uchar chip) 689 { 690 uchar tmp; 691 692 /* 693 * read addr 0x0 of the given chip. 694 */ 695 return kona_i2c_read(adap, chip, 0x0, 1, &tmp, 1); 696 } 697 698 static uint kona_i2c_set_bus_speed(struct i2c_adapter *adap, uint speed) 699 { 700 struct bcm_kona_i2c_dev *dev = kona_get_dev(adap); 701 return bcm_kona_i2c_assign_bus_speed(dev, speed); 702 } 703 704 /* 705 * Register kona i2c adapters. Keep the order below so 706 * that the bus number matches the adapter number. 707 */ 708 #define DEF_ADAPTER(num) \ 709 U_BOOT_I2C_ADAP_COMPLETE(kona##num, kona_i2c_init, kona_i2c_probe, \ 710 kona_i2c_read, kona_i2c_write, \ 711 kona_i2c_set_bus_speed, DEF_SPD, 0x00, num) 712 713 #ifdef CONFIG_SYS_I2C_BASE0 714 DEF_ADAPTER(0) 715 #endif 716 #ifdef CONFIG_SYS_I2C_BASE1 717 DEF_ADAPTER(1) 718 #endif 719 #ifdef CONFIG_SYS_I2C_BASE2 720 DEF_ADAPTER(2) 721 #endif 722 #ifdef CONFIG_SYS_I2C_BASE3 723 DEF_ADAPTER(3) 724 #endif 725 #ifdef CONFIG_SYS_I2C_BASE4 726 DEF_ADAPTER(4) 727 #endif 728 #ifdef CONFIG_SYS_I2C_BASE5 729 DEF_ADAPTER(5) 730 #endif 731