1 /* 2 * i2c driver for Freescale i.MX series 3 * 4 * (c) 2007 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de> 5 * (c) 2011 Marek Vasut <marek.vasut@gmail.com> 6 * 7 * Based on i2c-imx.c from linux kernel: 8 * Copyright (C) 2005 Torsten Koschorrek <koschorrek at synertronixx.de> 9 * Copyright (C) 2005 Matthias Blaschke <blaschke at synertronixx.de> 10 * Copyright (C) 2007 RightHand Technologies, Inc. 11 * Copyright (C) 2008 Darius Augulis <darius.augulis at teltonika.lt> 12 * 13 * 14 * SPDX-License-Identifier: GPL-2.0+ 15 */ 16 17 #include <common.h> 18 #include <asm/arch/clock.h> 19 #include <asm/arch/imx-regs.h> 20 #include <linux/errno.h> 21 #include <asm/mach-imx/mxc_i2c.h> 22 #include <asm/io.h> 23 #include <i2c.h> 24 #include <watchdog.h> 25 #include <dm.h> 26 #include <dm/pinctrl.h> 27 #include <fdtdec.h> 28 29 DECLARE_GLOBAL_DATA_PTR; 30 31 #define I2C_QUIRK_FLAG (1 << 0) 32 33 #define IMX_I2C_REGSHIFT 2 34 #define VF610_I2C_REGSHIFT 0 35 36 #define I2C_EARLY_INIT_INDEX 0 37 #ifdef CONFIG_SYS_I2C_IFDR_DIV 38 #define I2C_IFDR_DIV_CONSERVATIVE CONFIG_SYS_I2C_IFDR_DIV 39 #else 40 #define I2C_IFDR_DIV_CONSERVATIVE 0x7e 41 #endif 42 43 /* Register index */ 44 #define IADR 0 45 #define IFDR 1 46 #define I2CR 2 47 #define I2SR 3 48 #define I2DR 4 49 50 #define I2CR_IIEN (1 << 6) 51 #define I2CR_MSTA (1 << 5) 52 #define I2CR_MTX (1 << 4) 53 #define I2CR_TX_NO_AK (1 << 3) 54 #define I2CR_RSTA (1 << 2) 55 56 #define I2SR_ICF (1 << 7) 57 #define I2SR_IBB (1 << 5) 58 #define I2SR_IAL (1 << 4) 59 #define I2SR_IIF (1 << 1) 60 #define I2SR_RX_NO_AK (1 << 0) 61 62 #ifdef I2C_QUIRK_REG 63 #define I2CR_IEN (0 << 7) 64 #define I2CR_IDIS (1 << 7) 65 #define I2SR_IIF_CLEAR (1 << 1) 66 #else 67 #define I2CR_IEN (1 << 7) 68 #define I2CR_IDIS (0 << 7) 69 #define I2SR_IIF_CLEAR (0 << 1) 70 #endif 71 72 #ifdef I2C_QUIRK_REG 73 static u16 i2c_clk_div[60][2] = { 74 { 20, 0x00 }, { 22, 0x01 }, { 24, 0x02 }, { 26, 0x03 }, 75 { 28, 0x04 }, { 30, 0x05 }, { 32, 0x09 }, { 34, 0x06 }, 76 { 36, 0x0A }, { 40, 0x07 }, { 44, 0x0C }, { 48, 0x0D }, 77 { 52, 0x43 }, { 56, 0x0E }, { 60, 0x45 }, { 64, 0x12 }, 78 { 68, 0x0F }, { 72, 0x13 }, { 80, 0x14 }, { 88, 0x15 }, 79 { 96, 0x19 }, { 104, 0x16 }, { 112, 0x1A }, { 128, 0x17 }, 80 { 136, 0x4F }, { 144, 0x1C }, { 160, 0x1D }, { 176, 0x55 }, 81 { 192, 0x1E }, { 208, 0x56 }, { 224, 0x22 }, { 228, 0x24 }, 82 { 240, 0x1F }, { 256, 0x23 }, { 288, 0x5C }, { 320, 0x25 }, 83 { 384, 0x26 }, { 448, 0x2A }, { 480, 0x27 }, { 512, 0x2B }, 84 { 576, 0x2C }, { 640, 0x2D }, { 768, 0x31 }, { 896, 0x32 }, 85 { 960, 0x2F }, { 1024, 0x33 }, { 1152, 0x34 }, { 1280, 0x35 }, 86 { 1536, 0x36 }, { 1792, 0x3A }, { 1920, 0x37 }, { 2048, 0x3B }, 87 { 2304, 0x3C }, { 2560, 0x3D }, { 3072, 0x3E }, { 3584, 0x7A }, 88 { 3840, 0x3F }, { 4096, 0x7B }, { 5120, 0x7D }, { 6144, 0x7E }, 89 }; 90 #else 91 static u16 i2c_clk_div[50][2] = { 92 { 22, 0x20 }, { 24, 0x21 }, { 26, 0x22 }, { 28, 0x23 }, 93 { 30, 0x00 }, { 32, 0x24 }, { 36, 0x25 }, { 40, 0x26 }, 94 { 42, 0x03 }, { 44, 0x27 }, { 48, 0x28 }, { 52, 0x05 }, 95 { 56, 0x29 }, { 60, 0x06 }, { 64, 0x2A }, { 72, 0x2B }, 96 { 80, 0x2C }, { 88, 0x09 }, { 96, 0x2D }, { 104, 0x0A }, 97 { 112, 0x2E }, { 128, 0x2F }, { 144, 0x0C }, { 160, 0x30 }, 98 { 192, 0x31 }, { 224, 0x32 }, { 240, 0x0F }, { 256, 0x33 }, 99 { 288, 0x10 }, { 320, 0x34 }, { 384, 0x35 }, { 448, 0x36 }, 100 { 480, 0x13 }, { 512, 0x37 }, { 576, 0x14 }, { 640, 0x38 }, 101 { 768, 0x39 }, { 896, 0x3A }, { 960, 0x17 }, { 1024, 0x3B }, 102 { 1152, 0x18 }, { 1280, 0x3C }, { 1536, 0x3D }, { 1792, 0x3E }, 103 { 1920, 0x1B }, { 2048, 0x3F }, { 2304, 0x1C }, { 2560, 0x1D }, 104 { 3072, 0x1E }, { 3840, 0x1F } 105 }; 106 #endif 107 108 #ifndef CONFIG_SYS_MXC_I2C1_SPEED 109 #define CONFIG_SYS_MXC_I2C1_SPEED 100000 110 #endif 111 #ifndef CONFIG_SYS_MXC_I2C2_SPEED 112 #define CONFIG_SYS_MXC_I2C2_SPEED 100000 113 #endif 114 #ifndef CONFIG_SYS_MXC_I2C3_SPEED 115 #define CONFIG_SYS_MXC_I2C3_SPEED 100000 116 #endif 117 #ifndef CONFIG_SYS_MXC_I2C4_SPEED 118 #define CONFIG_SYS_MXC_I2C4_SPEED 100000 119 #endif 120 121 #ifndef CONFIG_SYS_MXC_I2C1_SLAVE 122 #define CONFIG_SYS_MXC_I2C1_SLAVE 0 123 #endif 124 #ifndef CONFIG_SYS_MXC_I2C2_SLAVE 125 #define CONFIG_SYS_MXC_I2C2_SLAVE 0 126 #endif 127 #ifndef CONFIG_SYS_MXC_I2C3_SLAVE 128 #define CONFIG_SYS_MXC_I2C3_SLAVE 0 129 #endif 130 #ifndef CONFIG_SYS_MXC_I2C4_SLAVE 131 #define CONFIG_SYS_MXC_I2C4_SLAVE 0 132 #endif 133 134 /* 135 * Calculate and set proper clock divider 136 */ 137 static uint8_t i2c_imx_get_clk(struct mxc_i2c_bus *i2c_bus, unsigned int rate) 138 { 139 unsigned int i2c_clk_rate; 140 unsigned int div; 141 u8 clk_div; 142 143 #if defined(CONFIG_MX31) 144 struct clock_control_regs *sc_regs = 145 (struct clock_control_regs *)CCM_BASE; 146 147 /* start the required I2C clock */ 148 writel(readl(&sc_regs->cgr0) | (3 << CONFIG_SYS_I2C_CLK_OFFSET), 149 &sc_regs->cgr0); 150 #endif 151 152 /* Divider value calculation */ 153 i2c_clk_rate = mxc_get_clock(MXC_I2C_CLK); 154 div = (i2c_clk_rate + rate - 1) / rate; 155 if (div < i2c_clk_div[0][0]) 156 clk_div = 0; 157 else if (div > i2c_clk_div[ARRAY_SIZE(i2c_clk_div) - 1][0]) 158 clk_div = ARRAY_SIZE(i2c_clk_div) - 1; 159 else 160 for (clk_div = 0; i2c_clk_div[clk_div][0] < div; clk_div++) 161 ; 162 163 /* Store divider value */ 164 return clk_div; 165 } 166 167 /* 168 * Set I2C Bus speed 169 */ 170 static int bus_i2c_set_bus_speed(struct mxc_i2c_bus *i2c_bus, int speed) 171 { 172 ulong base = i2c_bus->base; 173 bool quirk = i2c_bus->driver_data & I2C_QUIRK_FLAG ? true : false; 174 u8 clk_idx = i2c_imx_get_clk(i2c_bus, speed); 175 u8 idx = i2c_clk_div[clk_idx][1]; 176 int reg_shift = quirk ? VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT; 177 178 if (!base) 179 return -EINVAL; 180 181 /* Store divider value */ 182 writeb(idx, base + (IFDR << reg_shift)); 183 184 /* Reset module */ 185 writeb(I2CR_IDIS, base + (I2CR << reg_shift)); 186 writeb(0, base + (I2SR << reg_shift)); 187 return 0; 188 } 189 190 #define ST_BUS_IDLE (0 | (I2SR_IBB << 8)) 191 #define ST_BUS_BUSY (I2SR_IBB | (I2SR_IBB << 8)) 192 #define ST_IIF (I2SR_IIF | (I2SR_IIF << 8)) 193 194 static int wait_for_sr_state(struct mxc_i2c_bus *i2c_bus, unsigned state) 195 { 196 unsigned sr; 197 ulong elapsed; 198 bool quirk = i2c_bus->driver_data & I2C_QUIRK_FLAG ? true : false; 199 int reg_shift = quirk ? VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT; 200 ulong base = i2c_bus->base; 201 ulong start_time = get_timer(0); 202 for (;;) { 203 sr = readb(base + (I2SR << reg_shift)); 204 if (sr & I2SR_IAL) { 205 if (quirk) 206 writeb(sr | I2SR_IAL, base + 207 (I2SR << reg_shift)); 208 else 209 writeb(sr & ~I2SR_IAL, base + 210 (I2SR << reg_shift)); 211 printf("%s: Arbitration lost sr=%x cr=%x state=%x\n", 212 __func__, sr, readb(base + (I2CR << reg_shift)), 213 state); 214 return -ERESTART; 215 } 216 if ((sr & (state >> 8)) == (unsigned char)state) 217 return sr; 218 WATCHDOG_RESET(); 219 elapsed = get_timer(start_time); 220 if (elapsed > (CONFIG_SYS_HZ / 10)) /* .1 seconds */ 221 break; 222 } 223 printf("%s: failed sr=%x cr=%x state=%x\n", __func__, 224 sr, readb(base + (I2CR << reg_shift)), state); 225 return -ETIMEDOUT; 226 } 227 228 static int tx_byte(struct mxc_i2c_bus *i2c_bus, u8 byte) 229 { 230 int ret; 231 int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ? 232 VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT; 233 ulong base = i2c_bus->base; 234 235 writeb(I2SR_IIF_CLEAR, base + (I2SR << reg_shift)); 236 writeb(byte, base + (I2DR << reg_shift)); 237 238 ret = wait_for_sr_state(i2c_bus, ST_IIF); 239 if (ret < 0) 240 return ret; 241 if (ret & I2SR_RX_NO_AK) 242 return -EREMOTEIO; 243 return 0; 244 } 245 246 /* 247 * Stub implementations for outer i2c slave operations. 248 */ 249 void __i2c_force_reset_slave(void) 250 { 251 } 252 void i2c_force_reset_slave(void) 253 __attribute__((weak, alias("__i2c_force_reset_slave"))); 254 255 /* 256 * Stop I2C transaction 257 */ 258 static void i2c_imx_stop(struct mxc_i2c_bus *i2c_bus) 259 { 260 int ret; 261 int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ? 262 VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT; 263 ulong base = i2c_bus->base; 264 unsigned int temp = readb(base + (I2CR << reg_shift)); 265 266 temp &= ~(I2CR_MSTA | I2CR_MTX); 267 writeb(temp, base + (I2CR << reg_shift)); 268 ret = wait_for_sr_state(i2c_bus, ST_BUS_IDLE); 269 if (ret < 0) 270 printf("%s:trigger stop failed\n", __func__); 271 } 272 273 /* 274 * Send start signal, chip address and 275 * write register address 276 */ 277 static int i2c_init_transfer_(struct mxc_i2c_bus *i2c_bus, u8 chip, 278 u32 addr, int alen) 279 { 280 unsigned int temp; 281 int ret; 282 bool quirk = i2c_bus->driver_data & I2C_QUIRK_FLAG ? true : false; 283 ulong base = i2c_bus->base; 284 int reg_shift = quirk ? VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT; 285 286 /* Reset i2c slave */ 287 i2c_force_reset_slave(); 288 289 /* Enable I2C controller */ 290 if (quirk) 291 ret = readb(base + (I2CR << reg_shift)) & I2CR_IDIS; 292 else 293 ret = !(readb(base + (I2CR << reg_shift)) & I2CR_IEN); 294 295 if (ret) { 296 writeb(I2CR_IEN, base + (I2CR << reg_shift)); 297 /* Wait for controller to be stable */ 298 udelay(50); 299 } 300 301 if (readb(base + (IADR << reg_shift)) == (chip << 1)) 302 writeb((chip << 1) ^ 2, base + (IADR << reg_shift)); 303 writeb(I2SR_IIF_CLEAR, base + (I2SR << reg_shift)); 304 ret = wait_for_sr_state(i2c_bus, ST_BUS_IDLE); 305 if (ret < 0) 306 return ret; 307 308 /* Start I2C transaction */ 309 temp = readb(base + (I2CR << reg_shift)); 310 temp |= I2CR_MSTA; 311 writeb(temp, base + (I2CR << reg_shift)); 312 313 ret = wait_for_sr_state(i2c_bus, ST_BUS_BUSY); 314 if (ret < 0) 315 return ret; 316 317 temp |= I2CR_MTX | I2CR_TX_NO_AK; 318 writeb(temp, base + (I2CR << reg_shift)); 319 320 if (alen >= 0) { 321 /* write slave address */ 322 ret = tx_byte(i2c_bus, chip << 1); 323 if (ret < 0) 324 return ret; 325 326 while (alen--) { 327 ret = tx_byte(i2c_bus, (addr >> (alen * 8)) & 0xff); 328 if (ret < 0) 329 return ret; 330 } 331 } 332 333 return 0; 334 } 335 336 #ifndef CONFIG_DM_I2C 337 int i2c_idle_bus(struct mxc_i2c_bus *i2c_bus) 338 { 339 if (i2c_bus && i2c_bus->idle_bus_fn) 340 return i2c_bus->idle_bus_fn(i2c_bus->idle_bus_data); 341 return 0; 342 } 343 #else 344 /* 345 * See Linux Documentation/devicetree/bindings/i2c/i2c-imx.txt 346 * " 347 * scl-gpios: specify the gpio related to SCL pin 348 * sda-gpios: specify the gpio related to SDA pin 349 * add pinctrl to configure i2c pins to gpio function for i2c 350 * bus recovery, call it "gpio" state 351 * " 352 * 353 * The i2c_idle_bus is an implementation following Linux Kernel. 354 */ 355 int i2c_idle_bus(struct mxc_i2c_bus *i2c_bus) 356 { 357 struct udevice *bus = i2c_bus->bus; 358 struct gpio_desc *scl_gpio = &i2c_bus->scl_gpio; 359 struct gpio_desc *sda_gpio = &i2c_bus->sda_gpio; 360 int sda, scl; 361 int i, ret = 0; 362 ulong elapsed, start_time; 363 364 if (pinctrl_select_state(bus, "gpio")) { 365 dev_dbg(bus, "Can not to switch to use gpio pinmux\n"); 366 /* 367 * GPIO pinctrl for i2c force idle is not a must, 368 * but it is strongly recommended to be used. 369 * Because it can help you to recover from bad 370 * i2c bus state. Do not return failure, because 371 * it is not a must. 372 */ 373 return 0; 374 } 375 376 dm_gpio_set_dir_flags(scl_gpio, GPIOD_IS_IN); 377 dm_gpio_set_dir_flags(sda_gpio, GPIOD_IS_IN); 378 scl = dm_gpio_get_value(scl_gpio); 379 sda = dm_gpio_get_value(sda_gpio); 380 381 if ((sda & scl) == 1) 382 goto exit; /* Bus is idle already */ 383 384 /* Send high and low on the SCL line */ 385 for (i = 0; i < 9; i++) { 386 dm_gpio_set_dir_flags(scl_gpio, GPIOD_IS_OUT); 387 dm_gpio_set_value(scl_gpio, 0); 388 udelay(50); 389 dm_gpio_set_dir_flags(scl_gpio, GPIOD_IS_IN); 390 udelay(50); 391 } 392 start_time = get_timer(0); 393 for (;;) { 394 dm_gpio_set_dir_flags(scl_gpio, GPIOD_IS_IN); 395 dm_gpio_set_dir_flags(sda_gpio, GPIOD_IS_IN); 396 scl = dm_gpio_get_value(scl_gpio); 397 sda = dm_gpio_get_value(sda_gpio); 398 if ((sda & scl) == 1) 399 break; 400 WATCHDOG_RESET(); 401 elapsed = get_timer(start_time); 402 if (elapsed > (CONFIG_SYS_HZ / 5)) { /* .2 seconds */ 403 ret = -EBUSY; 404 printf("%s: failed to clear bus, sda=%d scl=%d\n", __func__, sda, scl); 405 break; 406 } 407 } 408 409 exit: 410 pinctrl_select_state(bus, "default"); 411 return ret; 412 } 413 #endif 414 415 static int i2c_init_transfer(struct mxc_i2c_bus *i2c_bus, u8 chip, 416 u32 addr, int alen) 417 { 418 int retry; 419 int ret; 420 int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ? 421 VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT; 422 423 if (!i2c_bus->base) 424 return -EINVAL; 425 426 for (retry = 0; retry < 3; retry++) { 427 ret = i2c_init_transfer_(i2c_bus, chip, addr, alen); 428 if (ret >= 0) 429 return 0; 430 i2c_imx_stop(i2c_bus); 431 if (ret == -EREMOTEIO) 432 return ret; 433 434 printf("%s: failed for chip 0x%x retry=%d\n", __func__, chip, 435 retry); 436 if (ret != -ERESTART) 437 /* Disable controller */ 438 writeb(I2CR_IDIS, i2c_bus->base + (I2CR << reg_shift)); 439 udelay(100); 440 if (i2c_idle_bus(i2c_bus) < 0) 441 break; 442 } 443 printf("%s: give up i2c_regs=0x%lx\n", __func__, i2c_bus->base); 444 return ret; 445 } 446 447 448 static int i2c_write_data(struct mxc_i2c_bus *i2c_bus, u8 chip, const u8 *buf, 449 int len) 450 { 451 int i, ret = 0; 452 453 debug("i2c_write_data: chip=0x%x, len=0x%x\n", chip, len); 454 debug("write_data: "); 455 /* use rc for counter */ 456 for (i = 0; i < len; ++i) 457 debug(" 0x%02x", buf[i]); 458 debug("\n"); 459 460 for (i = 0; i < len; i++) { 461 ret = tx_byte(i2c_bus, buf[i]); 462 if (ret < 0) { 463 debug("i2c_write_data(): rc=%d\n", ret); 464 break; 465 } 466 } 467 468 return ret; 469 } 470 471 static int i2c_read_data(struct mxc_i2c_bus *i2c_bus, uchar chip, uchar *buf, 472 int len) 473 { 474 int ret; 475 unsigned int temp; 476 int i; 477 int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ? 478 VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT; 479 ulong base = i2c_bus->base; 480 481 debug("i2c_read_data: chip=0x%x, len=0x%x\n", chip, len); 482 483 /* setup bus to read data */ 484 temp = readb(base + (I2CR << reg_shift)); 485 temp &= ~(I2CR_MTX | I2CR_TX_NO_AK); 486 if (len == 1) 487 temp |= I2CR_TX_NO_AK; 488 writeb(temp, base + (I2CR << reg_shift)); 489 writeb(I2SR_IIF_CLEAR, base + (I2SR << reg_shift)); 490 /* dummy read to clear ICF */ 491 readb(base + (I2DR << reg_shift)); 492 493 /* read data */ 494 for (i = 0; i < len; i++) { 495 ret = wait_for_sr_state(i2c_bus, ST_IIF); 496 if (ret < 0) { 497 debug("i2c_read_data(): ret=%d\n", ret); 498 i2c_imx_stop(i2c_bus); 499 return ret; 500 } 501 502 /* 503 * It must generate STOP before read I2DR to prevent 504 * controller from generating another clock cycle 505 */ 506 if (i == (len - 1)) { 507 i2c_imx_stop(i2c_bus); 508 } else if (i == (len - 2)) { 509 temp = readb(base + (I2CR << reg_shift)); 510 temp |= I2CR_TX_NO_AK; 511 writeb(temp, base + (I2CR << reg_shift)); 512 } 513 writeb(I2SR_IIF_CLEAR, base + (I2SR << reg_shift)); 514 buf[i] = readb(base + (I2DR << reg_shift)); 515 } 516 517 /* reuse ret for counter*/ 518 for (ret = 0; ret < len; ++ret) 519 debug(" 0x%02x", buf[ret]); 520 debug("\n"); 521 522 i2c_imx_stop(i2c_bus); 523 return 0; 524 } 525 526 #ifndef CONFIG_DM_I2C 527 /* 528 * Read data from I2C device 529 */ 530 static int bus_i2c_read(struct mxc_i2c_bus *i2c_bus, u8 chip, u32 addr, 531 int alen, u8 *buf, int len) 532 { 533 int ret = 0; 534 u32 temp; 535 int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ? 536 VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT; 537 ulong base = i2c_bus->base; 538 539 ret = i2c_init_transfer(i2c_bus, chip, addr, alen); 540 if (ret < 0) 541 return ret; 542 543 if (alen >= 0) { 544 temp = readb(base + (I2CR << reg_shift)); 545 temp |= I2CR_RSTA; 546 writeb(temp, base + (I2CR << reg_shift)); 547 } 548 549 ret = tx_byte(i2c_bus, (chip << 1) | 1); 550 if (ret < 0) { 551 i2c_imx_stop(i2c_bus); 552 return ret; 553 } 554 555 ret = i2c_read_data(i2c_bus, chip, buf, len); 556 557 i2c_imx_stop(i2c_bus); 558 return ret; 559 } 560 561 /* 562 * Write data to I2C device 563 */ 564 static int bus_i2c_write(struct mxc_i2c_bus *i2c_bus, u8 chip, u32 addr, 565 int alen, const u8 *buf, int len) 566 { 567 int ret = 0; 568 569 ret = i2c_init_transfer(i2c_bus, chip, addr, alen); 570 if (ret < 0) 571 return ret; 572 573 ret = i2c_write_data(i2c_bus, chip, buf, len); 574 575 i2c_imx_stop(i2c_bus); 576 577 return ret; 578 } 579 580 #if !defined(I2C2_BASE_ADDR) 581 #define I2C2_BASE_ADDR 0 582 #endif 583 584 #if !defined(I2C3_BASE_ADDR) 585 #define I2C3_BASE_ADDR 0 586 #endif 587 588 #if !defined(I2C4_BASE_ADDR) 589 #define I2C4_BASE_ADDR 0 590 #endif 591 592 static struct mxc_i2c_bus mxc_i2c_buses[] = { 593 #if defined(CONFIG_ARCH_LS1021A) || defined(CONFIG_VF610) || \ 594 defined(CONFIG_FSL_LAYERSCAPE) 595 { 0, I2C1_BASE_ADDR, I2C_QUIRK_FLAG }, 596 { 1, I2C2_BASE_ADDR, I2C_QUIRK_FLAG }, 597 { 2, I2C3_BASE_ADDR, I2C_QUIRK_FLAG }, 598 { 3, I2C4_BASE_ADDR, I2C_QUIRK_FLAG }, 599 #else 600 { 0, I2C1_BASE_ADDR, 0 }, 601 { 1, I2C2_BASE_ADDR, 0 }, 602 { 2, I2C3_BASE_ADDR, 0 }, 603 { 3, I2C4_BASE_ADDR, 0 }, 604 #endif 605 }; 606 607 struct mxc_i2c_bus *i2c_get_base(struct i2c_adapter *adap) 608 { 609 return &mxc_i2c_buses[adap->hwadapnr]; 610 } 611 612 static int mxc_i2c_read(struct i2c_adapter *adap, uint8_t chip, 613 uint addr, int alen, uint8_t *buffer, 614 int len) 615 { 616 return bus_i2c_read(i2c_get_base(adap), chip, addr, alen, buffer, len); 617 } 618 619 static int mxc_i2c_write(struct i2c_adapter *adap, uint8_t chip, 620 uint addr, int alen, uint8_t *buffer, 621 int len) 622 { 623 return bus_i2c_write(i2c_get_base(adap), chip, addr, alen, buffer, len); 624 } 625 626 /* 627 * Test if a chip at a given address responds (probe the chip) 628 */ 629 static int mxc_i2c_probe(struct i2c_adapter *adap, uint8_t chip) 630 { 631 return bus_i2c_write(i2c_get_base(adap), chip, 0, 0, NULL, 0); 632 } 633 634 int __enable_i2c_clk(unsigned char enable, unsigned i2c_num) 635 { 636 return 1; 637 } 638 int enable_i2c_clk(unsigned char enable, unsigned i2c_num) 639 __attribute__((weak, alias("__enable_i2c_clk"))); 640 641 void bus_i2c_init(int index, int speed, int unused, 642 int (*idle_bus_fn)(void *p), void *idle_bus_data) 643 { 644 int ret; 645 646 if (index >= ARRAY_SIZE(mxc_i2c_buses)) { 647 debug("Error i2c index\n"); 648 return; 649 } 650 651 /* 652 * Warning: Be careful to allow the assignment to a static 653 * variable here. This function could be called while U-Boot is 654 * still running in flash memory. So such assignment is equal 655 * to write data to flash without erasing. 656 */ 657 if (idle_bus_fn) 658 mxc_i2c_buses[index].idle_bus_fn = idle_bus_fn; 659 if (idle_bus_data) 660 mxc_i2c_buses[index].idle_bus_data = idle_bus_data; 661 662 ret = enable_i2c_clk(1, index); 663 if (ret < 0) { 664 debug("I2C-%d clk fail to enable.\n", index); 665 return; 666 } 667 668 bus_i2c_set_bus_speed(&mxc_i2c_buses[index], speed); 669 } 670 671 /* 672 * Early init I2C for prepare read the clk through I2C. 673 */ 674 void i2c_early_init_f(void) 675 { 676 ulong base = mxc_i2c_buses[I2C_EARLY_INIT_INDEX].base; 677 bool quirk = mxc_i2c_buses[I2C_EARLY_INIT_INDEX].driver_data 678 & I2C_QUIRK_FLAG ? true : false; 679 int reg_shift = quirk ? VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT; 680 681 /* Set I2C divider value */ 682 writeb(I2C_IFDR_DIV_CONSERVATIVE, base + (IFDR << reg_shift)); 683 /* Reset module */ 684 writeb(I2CR_IDIS, base + (I2CR << reg_shift)); 685 writeb(0, base + (I2SR << reg_shift)); 686 /* Enable I2C */ 687 writeb(I2CR_IEN, base + (I2CR << reg_shift)); 688 } 689 690 /* 691 * Init I2C Bus 692 */ 693 static void mxc_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr) 694 { 695 bus_i2c_init(adap->hwadapnr, speed, slaveaddr, NULL, NULL); 696 } 697 698 /* 699 * Set I2C Speed 700 */ 701 static u32 mxc_i2c_set_bus_speed(struct i2c_adapter *adap, uint speed) 702 { 703 return bus_i2c_set_bus_speed(i2c_get_base(adap), speed); 704 } 705 706 /* 707 * Register mxc i2c adapters 708 */ 709 #ifdef CONFIG_SYS_I2C_MXC_I2C1 710 U_BOOT_I2C_ADAP_COMPLETE(mxc0, mxc_i2c_init, mxc_i2c_probe, 711 mxc_i2c_read, mxc_i2c_write, 712 mxc_i2c_set_bus_speed, 713 CONFIG_SYS_MXC_I2C1_SPEED, 714 CONFIG_SYS_MXC_I2C1_SLAVE, 0) 715 #endif 716 717 #ifdef CONFIG_SYS_I2C_MXC_I2C2 718 U_BOOT_I2C_ADAP_COMPLETE(mxc1, mxc_i2c_init, mxc_i2c_probe, 719 mxc_i2c_read, mxc_i2c_write, 720 mxc_i2c_set_bus_speed, 721 CONFIG_SYS_MXC_I2C2_SPEED, 722 CONFIG_SYS_MXC_I2C2_SLAVE, 1) 723 #endif 724 725 #ifdef CONFIG_SYS_I2C_MXC_I2C3 726 U_BOOT_I2C_ADAP_COMPLETE(mxc2, mxc_i2c_init, mxc_i2c_probe, 727 mxc_i2c_read, mxc_i2c_write, 728 mxc_i2c_set_bus_speed, 729 CONFIG_SYS_MXC_I2C3_SPEED, 730 CONFIG_SYS_MXC_I2C3_SLAVE, 2) 731 #endif 732 733 #ifdef CONFIG_SYS_I2C_MXC_I2C4 734 U_BOOT_I2C_ADAP_COMPLETE(mxc3, mxc_i2c_init, mxc_i2c_probe, 735 mxc_i2c_read, mxc_i2c_write, 736 mxc_i2c_set_bus_speed, 737 CONFIG_SYS_MXC_I2C4_SPEED, 738 CONFIG_SYS_MXC_I2C4_SLAVE, 3) 739 #endif 740 741 #else 742 743 static int mxc_i2c_set_bus_speed(struct udevice *bus, unsigned int speed) 744 { 745 struct mxc_i2c_bus *i2c_bus = dev_get_priv(bus); 746 747 return bus_i2c_set_bus_speed(i2c_bus, speed); 748 } 749 750 static int mxc_i2c_probe(struct udevice *bus) 751 { 752 struct mxc_i2c_bus *i2c_bus = dev_get_priv(bus); 753 const void *fdt = gd->fdt_blob; 754 int node = dev_of_offset(bus); 755 fdt_addr_t addr; 756 int ret, ret2; 757 758 i2c_bus->driver_data = dev_get_driver_data(bus); 759 760 addr = devfdt_get_addr(bus); 761 if (addr == FDT_ADDR_T_NONE) 762 return -EINVAL; 763 764 i2c_bus->base = addr; 765 i2c_bus->index = bus->seq; 766 i2c_bus->bus = bus; 767 768 /* Enable clk */ 769 ret = enable_i2c_clk(1, bus->seq); 770 if (ret < 0) 771 return ret; 772 773 /* 774 * See Documentation/devicetree/bindings/i2c/i2c-imx.txt 775 * Use gpio to force bus idle when necessary. 776 */ 777 ret = fdt_stringlist_search(fdt, node, "pinctrl-names", "gpio"); 778 if (ret < 0) { 779 debug("i2c bus %d at 0x%2lx, no gpio pinctrl state.\n", bus->seq, i2c_bus->base); 780 } else { 781 ret = gpio_request_by_name_nodev(offset_to_ofnode(node), 782 "scl-gpios", 0, &i2c_bus->scl_gpio, 783 GPIOD_IS_OUT); 784 ret2 = gpio_request_by_name_nodev(offset_to_ofnode(node), 785 "sda-gpios", 0, &i2c_bus->sda_gpio, 786 GPIOD_IS_OUT); 787 if (!dm_gpio_is_valid(&i2c_bus->sda_gpio) | 788 !dm_gpio_is_valid(&i2c_bus->scl_gpio) | 789 ret | ret2) { 790 dev_err(dev, "i2c bus %d at %lu, fail to request scl/sda gpio\n", bus->seq, i2c_bus->base); 791 return -EINVAL; 792 } 793 } 794 795 ret = i2c_idle_bus(i2c_bus); 796 if (ret < 0) { 797 /* Disable clk */ 798 enable_i2c_clk(0, bus->seq); 799 return ret; 800 } 801 802 /* 803 * Pinmux settings are in board file now, until pinmux is supported, 804 * we can set pinmux here in probe function. 805 */ 806 807 debug("i2c : controller bus %d at %lu , speed %d: ", 808 bus->seq, i2c_bus->base, 809 i2c_bus->speed); 810 811 return 0; 812 } 813 814 static int mxc_i2c_probe_chip(struct udevice *bus, u32 chip_addr, 815 u32 chip_flags) 816 { 817 int ret; 818 struct mxc_i2c_bus *i2c_bus = dev_get_priv(bus); 819 820 ret = i2c_init_transfer(i2c_bus, chip_addr, 0, 0); 821 if (ret < 0) { 822 debug("%s failed, ret = %d\n", __func__, ret); 823 return ret; 824 } 825 826 i2c_imx_stop(i2c_bus); 827 828 return 0; 829 } 830 831 static int mxc_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, int nmsgs) 832 { 833 struct mxc_i2c_bus *i2c_bus = dev_get_priv(bus); 834 int ret = 0; 835 ulong base = i2c_bus->base; 836 int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ? 837 VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT; 838 839 /* 840 * Here the 3rd parameter addr and the 4th one alen are set to 0, 841 * because here we only want to send out chip address. The register 842 * address is wrapped in msg. 843 */ 844 ret = i2c_init_transfer(i2c_bus, msg->addr, 0, 0); 845 if (ret < 0) { 846 debug("i2c_init_transfer error: %d\n", ret); 847 return ret; 848 } 849 850 for (; nmsgs > 0; nmsgs--, msg++) { 851 bool next_is_read = nmsgs > 1 && (msg[1].flags & I2C_M_RD); 852 debug("i2c_xfer: chip=0x%x, len=0x%x\n", msg->addr, msg->len); 853 if (msg->flags & I2C_M_RD) 854 ret = i2c_read_data(i2c_bus, msg->addr, msg->buf, 855 msg->len); 856 else { 857 ret = i2c_write_data(i2c_bus, msg->addr, msg->buf, 858 msg->len); 859 if (ret) 860 break; 861 if (next_is_read) { 862 /* Reuse ret */ 863 ret = readb(base + (I2CR << reg_shift)); 864 ret |= I2CR_RSTA; 865 writeb(ret, base + (I2CR << reg_shift)); 866 867 ret = tx_byte(i2c_bus, (msg->addr << 1) | 1); 868 if (ret < 0) { 869 i2c_imx_stop(i2c_bus); 870 break; 871 } 872 } 873 } 874 } 875 876 if (ret) 877 debug("i2c_write: error sending\n"); 878 879 i2c_imx_stop(i2c_bus); 880 881 return ret; 882 } 883 884 static const struct dm_i2c_ops mxc_i2c_ops = { 885 .xfer = mxc_i2c_xfer, 886 .probe_chip = mxc_i2c_probe_chip, 887 .set_bus_speed = mxc_i2c_set_bus_speed, 888 }; 889 890 static const struct udevice_id mxc_i2c_ids[] = { 891 { .compatible = "fsl,imx21-i2c", }, 892 { .compatible = "fsl,vf610-i2c", .data = I2C_QUIRK_FLAG, }, 893 {} 894 }; 895 896 U_BOOT_DRIVER(i2c_mxc) = { 897 .name = "i2c_mxc", 898 .id = UCLASS_I2C, 899 .of_match = mxc_i2c_ids, 900 .probe = mxc_i2c_probe, 901 .priv_auto_alloc_size = sizeof(struct mxc_i2c_bus), 902 .ops = &mxc_i2c_ops, 903 }; 904 #endif 905