1 /* 2 * Copyright 2019 Advanced Micro Devices, Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 */ 23 24 #include "smuio/smuio_11_0_0_offset.h" 25 #include "smuio/smuio_11_0_0_sh_mask.h" 26 27 #include "smu_v11_0_i2c.h" 28 #include "amdgpu.h" 29 #include "amdgpu_dpm.h" 30 #include "soc15_common.h" 31 #include <drm/drm_fixed.h> 32 #include <drm/drm_drv.h> 33 #include "amdgpu_amdkfd.h" 34 #include <linux/i2c.h> 35 #include <linux/pci.h> 36 37 /* error codes */ 38 #define I2C_OK 0 39 #define I2C_NAK_7B_ADDR_NOACK 1 40 #define I2C_NAK_TXDATA_NOACK 2 41 #define I2C_TIMEOUT 4 42 #define I2C_SW_TIMEOUT 8 43 #define I2C_ABORT 0x10 44 45 #define I2C_X_RESTART BIT(31) 46 smu_v11_0_i2c_set_clock_gating(struct i2c_adapter * control,bool en)47 static void smu_v11_0_i2c_set_clock_gating(struct i2c_adapter *control, bool en) 48 { 49 struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); 50 struct amdgpu_device *adev = smu_i2c->adev; 51 uint32_t reg = RREG32_SOC15(SMUIO, 0, mmSMUIO_PWRMGT); 52 53 reg = REG_SET_FIELD(reg, SMUIO_PWRMGT, i2c_clk_gate_en, en ? 1 : 0); 54 WREG32_SOC15(SMUIO, 0, mmSMUIO_PWRMGT, reg); 55 } 56 57 /* The T_I2C_POLL_US is defined as follows: 58 * 59 * "Define a timer interval (t_i2c_poll) equal to 10 times the 60 * signalling period for the highest I2C transfer speed used in the 61 * system and supported by DW_apb_i2c. For instance, if the highest 62 * I2C data transfer mode is 400 kb/s, then t_i2c_poll is 25 us." -- 63 * DesignWare DW_apb_i2c Databook, Version 1.21a, section 3.8.3.1, 64 * page 56, with grammar and syntax corrections. 65 * 66 * Vcc for our device is at 1.8V which puts it at 400 kHz, 67 * see Atmel AT24CM02 datasheet, section 8.3 DC Characteristics table, page 14. 68 * 69 * The procedure to disable the IP block is described in section 70 * 3.8.3 Disabling DW_apb_i2c on page 56. 71 */ 72 #define I2C_SPEED_MODE_FAST 2 73 #define T_I2C_POLL_US 25 74 #define I2C_MAX_T_POLL_COUNT 1000 75 smu_v11_0_i2c_enable(struct i2c_adapter * control,bool enable)76 static int smu_v11_0_i2c_enable(struct i2c_adapter *control, bool enable) 77 { 78 struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); 79 struct amdgpu_device *adev = smu_i2c->adev; 80 81 WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_ENABLE, enable ? 1 : 0); 82 83 if (!enable) { 84 int ii; 85 86 for (ii = I2C_MAX_T_POLL_COUNT; ii > 0; ii--) { 87 u32 en_stat = RREG32_SOC15(SMUIO, 88 0, 89 mmCKSVII2C_IC_ENABLE_STATUS); 90 if (REG_GET_FIELD(en_stat, CKSVII2C_IC_ENABLE_STATUS, IC_EN)) 91 udelay(T_I2C_POLL_US); 92 else 93 return I2C_OK; 94 } 95 96 return I2C_ABORT; 97 } 98 99 return I2C_OK; 100 } 101 smu_v11_0_i2c_clear_status(struct i2c_adapter * control)102 static void smu_v11_0_i2c_clear_status(struct i2c_adapter *control) 103 { 104 struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); 105 struct amdgpu_device *adev = smu_i2c->adev; 106 /* do */ 107 { 108 RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_CLR_INTR); 109 110 } /* while (reg_CKSVII2C_ic_clr_intr == 0) */ 111 } 112 smu_v11_0_i2c_configure(struct i2c_adapter * control)113 static void smu_v11_0_i2c_configure(struct i2c_adapter *control) 114 { 115 struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); 116 struct amdgpu_device *adev = smu_i2c->adev; 117 uint32_t reg = 0; 118 119 reg = REG_SET_FIELD(reg, CKSVII2C_IC_CON, IC_SLAVE_DISABLE, 1); 120 reg = REG_SET_FIELD(reg, CKSVII2C_IC_CON, IC_RESTART_EN, 1); 121 reg = REG_SET_FIELD(reg, CKSVII2C_IC_CON, IC_10BITADDR_MASTER, 0); 122 reg = REG_SET_FIELD(reg, CKSVII2C_IC_CON, IC_10BITADDR_SLAVE, 0); 123 /* The values of IC_MAX_SPEED_MODE are, 124 * 1: standard mode, 0 - 100 Kb/s, 125 * 2: fast mode, <= 400 Kb/s, or fast mode plus, <= 1000 Kb/s, 126 * 3: high speed mode, <= 3.4 Mb/s. 127 */ 128 reg = REG_SET_FIELD(reg, CKSVII2C_IC_CON, IC_MAX_SPEED_MODE, 129 I2C_SPEED_MODE_FAST); 130 reg = REG_SET_FIELD(reg, CKSVII2C_IC_CON, IC_MASTER_MODE, 1); 131 132 WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_CON, reg); 133 } 134 smu_v11_0_i2c_set_clock(struct i2c_adapter * control)135 static void smu_v11_0_i2c_set_clock(struct i2c_adapter *control) 136 { 137 struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); 138 struct amdgpu_device *adev = smu_i2c->adev; 139 140 /* 141 * Standard mode speed, These values are taken from SMUIO MAS, 142 * but are different from what is given is 143 * Synopsys spec. The values here are based on assumption 144 * that refclock is 100MHz 145 * 146 * Configuration for standard mode; Speed = 100kbps 147 * Scale linearly, for now only support standard speed clock 148 * This will work only with 100M ref clock 149 * 150 * TBD:Change the calculation to take into account ref clock values also. 151 */ 152 153 WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_FS_SPKLEN, 2); 154 WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_SS_SCL_HCNT, 120); 155 WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_SS_SCL_LCNT, 130); 156 WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_SDA_HOLD, 20); 157 } 158 smu_v11_0_i2c_set_address(struct i2c_adapter * control,u16 address)159 static void smu_v11_0_i2c_set_address(struct i2c_adapter *control, u16 address) 160 { 161 struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); 162 struct amdgpu_device *adev = smu_i2c->adev; 163 164 /* The IC_TAR::IC_TAR field is 10-bits wide. 165 * It takes a 7-bit or 10-bit addresses as an address, 166 * i.e. no read/write bit--no wire format, just the address. 167 */ 168 WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_TAR, address & 0x3FF); 169 } 170 smu_v11_0_i2c_poll_tx_status(struct i2c_adapter * control)171 static uint32_t smu_v11_0_i2c_poll_tx_status(struct i2c_adapter *control) 172 { 173 struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); 174 struct amdgpu_device *adev = smu_i2c->adev; 175 uint32_t ret = I2C_OK; 176 uint32_t reg, reg_c_tx_abrt_source; 177 178 /*Check if transmission is completed */ 179 unsigned long timeout_counter = jiffies + msecs_to_jiffies(20); 180 181 do { 182 if (time_after(jiffies, timeout_counter)) { 183 ret |= I2C_SW_TIMEOUT; 184 break; 185 } 186 187 reg = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_STATUS); 188 189 } while (REG_GET_FIELD(reg, CKSVII2C_IC_STATUS, TFE) == 0); 190 191 if (ret != I2C_OK) 192 return ret; 193 194 /* This only checks if NAK is received and transaction got aborted */ 195 reg = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_INTR_STAT); 196 197 if (REG_GET_FIELD(reg, CKSVII2C_IC_INTR_STAT, R_TX_ABRT) == 1) { 198 reg_c_tx_abrt_source = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_TX_ABRT_SOURCE); 199 DRM_INFO("TX was terminated, IC_TX_ABRT_SOURCE val is:%x", reg_c_tx_abrt_source); 200 201 /* Check for stop due to NACK */ 202 if (REG_GET_FIELD(reg_c_tx_abrt_source, 203 CKSVII2C_IC_TX_ABRT_SOURCE, 204 ABRT_TXDATA_NOACK) == 1) { 205 206 ret |= I2C_NAK_TXDATA_NOACK; 207 208 } else if (REG_GET_FIELD(reg_c_tx_abrt_source, 209 CKSVII2C_IC_TX_ABRT_SOURCE, 210 ABRT_7B_ADDR_NOACK) == 1) { 211 212 ret |= I2C_NAK_7B_ADDR_NOACK; 213 } else { 214 ret |= I2C_ABORT; 215 } 216 217 smu_v11_0_i2c_clear_status(control); 218 } 219 220 return ret; 221 } 222 smu_v11_0_i2c_poll_rx_status(struct i2c_adapter * control)223 static uint32_t smu_v11_0_i2c_poll_rx_status(struct i2c_adapter *control) 224 { 225 struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); 226 struct amdgpu_device *adev = smu_i2c->adev; 227 uint32_t ret = I2C_OK; 228 uint32_t reg_ic_status, reg_c_tx_abrt_source; 229 230 reg_c_tx_abrt_source = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_TX_ABRT_SOURCE); 231 232 /* If slave is not present */ 233 if (REG_GET_FIELD(reg_c_tx_abrt_source, 234 CKSVII2C_IC_TX_ABRT_SOURCE, 235 ABRT_7B_ADDR_NOACK) == 1) { 236 ret |= I2C_NAK_7B_ADDR_NOACK; 237 238 smu_v11_0_i2c_clear_status(control); 239 } else { /* wait till some data is there in RXFIFO */ 240 /* Poll for some byte in RXFIFO */ 241 unsigned long timeout_counter = jiffies + msecs_to_jiffies(20); 242 243 do { 244 if (time_after(jiffies, timeout_counter)) { 245 ret |= I2C_SW_TIMEOUT; 246 break; 247 } 248 249 reg_ic_status = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_STATUS); 250 251 } while (REG_GET_FIELD(reg_ic_status, CKSVII2C_IC_STATUS, RFNE) == 0); 252 } 253 254 return ret; 255 } 256 257 /** 258 * smu_v11_0_i2c_transmit - Send a block of data over the I2C bus to a slave device. 259 * 260 * @control: I2C adapter reference 261 * @address: The I2C address of the slave device. 262 * @data: The data to transmit over the bus. 263 * @numbytes: The amount of data to transmit. 264 * @i2c_flag: Flags for transmission 265 * 266 * Returns 0 on success or error. 267 */ smu_v11_0_i2c_transmit(struct i2c_adapter * control,u16 address,u8 * data,u32 numbytes,u32 i2c_flag)268 static uint32_t smu_v11_0_i2c_transmit(struct i2c_adapter *control, 269 u16 address, u8 *data, 270 u32 numbytes, u32 i2c_flag) 271 { 272 struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); 273 struct amdgpu_device *adev = smu_i2c->adev; 274 u32 bytes_sent, reg, ret = I2C_OK; 275 unsigned long timeout_counter; 276 277 bytes_sent = 0; 278 279 DRM_DEBUG_DRIVER("I2C_Transmit(), address = %x, bytes = %d , data: ", 280 address, numbytes); 281 282 if (drm_debug_enabled(DRM_UT_DRIVER)) { 283 print_hex_dump(KERN_INFO, "data: ", DUMP_PREFIX_NONE, 284 16, 1, data, numbytes, false); 285 } 286 287 /* Set the I2C slave address */ 288 smu_v11_0_i2c_set_address(control, address); 289 /* Enable I2C */ 290 smu_v11_0_i2c_enable(control, true); 291 292 /* Clear status bits */ 293 smu_v11_0_i2c_clear_status(control); 294 295 timeout_counter = jiffies + msecs_to_jiffies(20); 296 297 while (numbytes > 0) { 298 reg = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_STATUS); 299 if (!REG_GET_FIELD(reg, CKSVII2C_IC_STATUS, TFNF)) { 300 /* 301 * We waited for too long for the transmission 302 * FIFO to become not-full. Exit the loop 303 * with error. 304 */ 305 if (time_after(jiffies, timeout_counter)) { 306 ret |= I2C_SW_TIMEOUT; 307 goto Err; 308 } 309 } else { 310 reg = REG_SET_FIELD(reg, CKSVII2C_IC_DATA_CMD, DAT, 311 data[bytes_sent]); 312 313 /* Final message, final byte, must generate a 314 * STOP to release the bus, i.e. don't hold 315 * SCL low. 316 */ 317 if (numbytes == 1 && i2c_flag & I2C_M_STOP) 318 reg = REG_SET_FIELD(reg, 319 CKSVII2C_IC_DATA_CMD, 320 STOP, 1); 321 322 if (bytes_sent == 0 && i2c_flag & I2C_X_RESTART) 323 reg = REG_SET_FIELD(reg, 324 CKSVII2C_IC_DATA_CMD, 325 RESTART, 1); 326 327 /* Write */ 328 reg = REG_SET_FIELD(reg, CKSVII2C_IC_DATA_CMD, CMD, 0); 329 WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_DATA_CMD, reg); 330 331 /* Record that the bytes were transmitted */ 332 bytes_sent++; 333 numbytes--; 334 } 335 } 336 337 ret = smu_v11_0_i2c_poll_tx_status(control); 338 Err: 339 /* Any error, no point in proceeding */ 340 if (ret != I2C_OK) { 341 if (ret & I2C_SW_TIMEOUT) 342 DRM_ERROR("TIMEOUT ERROR !!!"); 343 344 if (ret & I2C_NAK_7B_ADDR_NOACK) 345 DRM_ERROR("Received I2C_NAK_7B_ADDR_NOACK !!!"); 346 347 348 if (ret & I2C_NAK_TXDATA_NOACK) 349 DRM_ERROR("Received I2C_NAK_TXDATA_NOACK !!!"); 350 } 351 352 return ret; 353 } 354 355 356 /** 357 * smu_v11_0_i2c_receive - Receive a block of data over the I2C bus from a slave device. 358 * 359 * @control: I2C adapter reference 360 * @address: The I2C address of the slave device. 361 * @data: Placeholder to store received data. 362 * @numbytes: The amount of data to transmit. 363 * @i2c_flag: Flags for transmission 364 * 365 * Returns 0 on success or error. 366 */ smu_v11_0_i2c_receive(struct i2c_adapter * control,u16 address,u8 * data,u32 numbytes,u32 i2c_flag)367 static uint32_t smu_v11_0_i2c_receive(struct i2c_adapter *control, 368 u16 address, u8 *data, 369 u32 numbytes, u32 i2c_flag) 370 { 371 struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); 372 struct amdgpu_device *adev = smu_i2c->adev; 373 uint32_t bytes_received, ret = I2C_OK; 374 375 bytes_received = 0; 376 377 /* Set the I2C slave address */ 378 smu_v11_0_i2c_set_address(control, address); 379 380 /* Enable I2C */ 381 smu_v11_0_i2c_enable(control, true); 382 383 while (numbytes > 0) { 384 uint32_t reg = 0; 385 386 smu_v11_0_i2c_clear_status(control); 387 388 /* Prepare transaction */ 389 reg = REG_SET_FIELD(reg, CKSVII2C_IC_DATA_CMD, DAT, 0); 390 /* Read */ 391 reg = REG_SET_FIELD(reg, CKSVII2C_IC_DATA_CMD, CMD, 1); 392 393 /* Final message, final byte, must generate a STOP 394 * to release the bus, i.e. don't hold SCL low. 395 */ 396 if (numbytes == 1 && i2c_flag & I2C_M_STOP) 397 reg = REG_SET_FIELD(reg, CKSVII2C_IC_DATA_CMD, 398 STOP, 1); 399 400 if (bytes_received == 0 && i2c_flag & I2C_X_RESTART) 401 reg = REG_SET_FIELD(reg, CKSVII2C_IC_DATA_CMD, 402 RESTART, 1); 403 404 WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_DATA_CMD, reg); 405 406 ret = smu_v11_0_i2c_poll_rx_status(control); 407 408 /* Any error, no point in proceeding */ 409 if (ret != I2C_OK) { 410 if (ret & I2C_SW_TIMEOUT) 411 DRM_ERROR("TIMEOUT ERROR !!!"); 412 413 if (ret & I2C_NAK_7B_ADDR_NOACK) 414 DRM_ERROR("Received I2C_NAK_7B_ADDR_NOACK !!!"); 415 416 if (ret & I2C_NAK_TXDATA_NOACK) 417 DRM_ERROR("Received I2C_NAK_TXDATA_NOACK !!!"); 418 419 break; 420 } 421 422 reg = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_DATA_CMD); 423 data[bytes_received] = REG_GET_FIELD(reg, CKSVII2C_IC_DATA_CMD, DAT); 424 425 /* Record that the bytes were received */ 426 bytes_received++; 427 numbytes--; 428 } 429 430 DRM_DEBUG_DRIVER("I2C_Receive(), address = %x, bytes = %d, data :", 431 (uint16_t)address, bytes_received); 432 433 if (drm_debug_enabled(DRM_UT_DRIVER)) { 434 print_hex_dump(KERN_INFO, "data: ", DUMP_PREFIX_NONE, 435 16, 1, data, bytes_received, false); 436 } 437 438 return ret; 439 } 440 smu_v11_0_i2c_abort(struct i2c_adapter * control)441 static void smu_v11_0_i2c_abort(struct i2c_adapter *control) 442 { 443 struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); 444 struct amdgpu_device *adev = smu_i2c->adev; 445 uint32_t reg = 0; 446 447 /* Enable I2C engine; */ 448 reg = REG_SET_FIELD(reg, CKSVII2C_IC_ENABLE, ENABLE, 1); 449 WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_ENABLE, reg); 450 451 /* Abort previous transaction */ 452 reg = REG_SET_FIELD(reg, CKSVII2C_IC_ENABLE, ABORT, 1); 453 WREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_ENABLE, reg); 454 455 DRM_DEBUG_DRIVER("I2C_Abort() Done."); 456 } 457 smu_v11_0_i2c_activity_done(struct i2c_adapter * control)458 static bool smu_v11_0_i2c_activity_done(struct i2c_adapter *control) 459 { 460 struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); 461 struct amdgpu_device *adev = smu_i2c->adev; 462 463 const uint32_t IDLE_TIMEOUT = 1024; 464 uint32_t timeout_count = 0; 465 uint32_t reg_ic_enable, reg_ic_enable_status, reg_ic_clr_activity; 466 467 reg_ic_enable_status = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_ENABLE_STATUS); 468 reg_ic_enable = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_ENABLE); 469 470 if ((REG_GET_FIELD(reg_ic_enable, CKSVII2C_IC_ENABLE, ENABLE) == 0) && 471 (REG_GET_FIELD(reg_ic_enable_status, CKSVII2C_IC_ENABLE_STATUS, IC_EN) == 1)) { 472 /* 473 * Nobody is using I2C engine, but engine remains active because 474 * someone missed to send STOP 475 */ 476 smu_v11_0_i2c_abort(control); 477 } else if (REG_GET_FIELD(reg_ic_enable, CKSVII2C_IC_ENABLE, ENABLE) == 0) { 478 /* Nobody is using I2C engine */ 479 return true; 480 } 481 482 /* Keep reading activity bit until it's cleared */ 483 do { 484 reg_ic_clr_activity = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_CLR_ACTIVITY); 485 486 if (REG_GET_FIELD(reg_ic_clr_activity, 487 CKSVII2C_IC_CLR_ACTIVITY, CLR_ACTIVITY) == 0) 488 return true; 489 490 ++timeout_count; 491 492 } while (timeout_count < IDLE_TIMEOUT); 493 494 return false; 495 } 496 smu_v11_0_i2c_init(struct i2c_adapter * control)497 static void smu_v11_0_i2c_init(struct i2c_adapter *control) 498 { 499 int res; 500 501 /* Disable clock gating */ 502 smu_v11_0_i2c_set_clock_gating(control, false); 503 504 if (!smu_v11_0_i2c_activity_done(control)) 505 DRM_WARN("I2C busy !"); 506 507 /* Disable I2C */ 508 res = smu_v11_0_i2c_enable(control, false); 509 if (res != I2C_OK) 510 smu_v11_0_i2c_abort(control); 511 512 /* Configure I2C to operate as master and in standard mode */ 513 smu_v11_0_i2c_configure(control); 514 515 /* Initialize the clock to 50 kHz default */ 516 smu_v11_0_i2c_set_clock(control); 517 518 } 519 smu_v11_0_i2c_fini(struct i2c_adapter * control)520 static void smu_v11_0_i2c_fini(struct i2c_adapter *control) 521 { 522 struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); 523 struct amdgpu_device *adev = smu_i2c->adev; 524 u32 status, enable, en_stat; 525 int res; 526 527 res = smu_v11_0_i2c_enable(control, false); 528 if (res != I2C_OK) { 529 status = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_STATUS); 530 enable = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_ENABLE); 531 en_stat = RREG32_SOC15(SMUIO, 0, mmCKSVII2C_IC_ENABLE_STATUS); 532 533 /* Nobody is using the I2C engine, yet it remains 534 * active, possibly because someone missed to send 535 * STOP. 536 */ 537 DRM_DEBUG_DRIVER("Aborting from fini: status:0x%08x " 538 "enable:0x%08x enable_stat:0x%08x", 539 status, enable, en_stat); 540 smu_v11_0_i2c_abort(control); 541 } 542 543 /* Restore clock gating */ 544 545 /* 546 * TODO Reenabling clock gating seems to break subsequent SMU operation 547 * on the I2C bus. My guess is that SMU doesn't disable clock gating like 548 * we do here before working with the bus. So for now just don't restore 549 * it but later work with SMU to see if they have this issue and can 550 * update their code appropriately 551 */ 552 /* smu_v11_0_i2c_set_clock_gating(control, true); */ 553 554 } 555 smu_v11_0_i2c_bus_lock(struct i2c_adapter * control)556 static bool smu_v11_0_i2c_bus_lock(struct i2c_adapter *control) 557 { 558 struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); 559 struct amdgpu_device *adev = smu_i2c->adev; 560 561 /* Send PPSMC_MSG_RequestI2CBus */ 562 if (!amdgpu_dpm_smu_i2c_bus_access(adev, true)) 563 return true; 564 565 return false; 566 } 567 smu_v11_0_i2c_bus_unlock(struct i2c_adapter * control)568 static bool smu_v11_0_i2c_bus_unlock(struct i2c_adapter *control) 569 { 570 struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(control); 571 struct amdgpu_device *adev = smu_i2c->adev; 572 573 /* Send PPSMC_MSG_ReleaseI2CBus */ 574 if (!amdgpu_dpm_smu_i2c_bus_access(adev, false)) 575 return true; 576 577 return false; 578 } 579 580 /***************************** I2C GLUE ****************************/ 581 smu_v11_0_i2c_read_data(struct i2c_adapter * control,struct i2c_msg * msg,uint32_t i2c_flag)582 static uint32_t smu_v11_0_i2c_read_data(struct i2c_adapter *control, 583 struct i2c_msg *msg, uint32_t i2c_flag) 584 { 585 uint32_t ret; 586 587 ret = smu_v11_0_i2c_receive(control, msg->addr, msg->buf, msg->len, i2c_flag); 588 589 if (ret != I2C_OK) 590 DRM_ERROR("ReadData() - I2C error occurred :%x", ret); 591 592 return ret; 593 } 594 smu_v11_0_i2c_write_data(struct i2c_adapter * control,struct i2c_msg * msg,uint32_t i2c_flag)595 static uint32_t smu_v11_0_i2c_write_data(struct i2c_adapter *control, 596 struct i2c_msg *msg, uint32_t i2c_flag) 597 { 598 uint32_t ret; 599 600 ret = smu_v11_0_i2c_transmit(control, msg->addr, msg->buf, msg->len, i2c_flag); 601 602 if (ret != I2C_OK) 603 DRM_ERROR("WriteI2CData() - I2C error occurred :%x", ret); 604 605 return ret; 606 607 } 608 lock_bus(struct i2c_adapter * i2c,unsigned int flags)609 static void lock_bus(struct i2c_adapter *i2c, unsigned int flags) 610 { 611 struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(i2c); 612 struct amdgpu_device *adev = smu_i2c->adev; 613 614 mutex_lock(&smu_i2c->mutex); 615 if (!smu_v11_0_i2c_bus_lock(i2c)) 616 DRM_ERROR("Failed to lock the bus from SMU"); 617 else 618 adev->pm.bus_locked = true; 619 } 620 trylock_bus(struct i2c_adapter * i2c,unsigned int flags)621 static int trylock_bus(struct i2c_adapter *i2c, unsigned int flags) 622 { 623 WARN_ONCE(1, "This operation not supposed to run in atomic context!"); 624 return false; 625 } 626 unlock_bus(struct i2c_adapter * i2c,unsigned int flags)627 static void unlock_bus(struct i2c_adapter *i2c, unsigned int flags) 628 { 629 struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(i2c); 630 struct amdgpu_device *adev = smu_i2c->adev; 631 632 if (!smu_v11_0_i2c_bus_unlock(i2c)) 633 DRM_ERROR("Failed to unlock the bus from SMU"); 634 else 635 adev->pm.bus_locked = false; 636 mutex_unlock(&smu_i2c->mutex); 637 } 638 639 static const struct i2c_lock_operations smu_v11_0_i2c_i2c_lock_ops = { 640 .lock_bus = lock_bus, 641 .trylock_bus = trylock_bus, 642 .unlock_bus = unlock_bus, 643 }; 644 smu_v11_0_i2c_xfer(struct i2c_adapter * i2c_adap,struct i2c_msg * msg,int num)645 static int smu_v11_0_i2c_xfer(struct i2c_adapter *i2c_adap, 646 struct i2c_msg *msg, int num) 647 { 648 int i, ret; 649 u16 addr, dir; 650 651 smu_v11_0_i2c_init(i2c_adap); 652 653 /* From the client's point of view, this sequence of 654 * messages-- the array i2c_msg *msg, is a single transaction 655 * on the bus, starting with START and ending with STOP. 656 * 657 * The client is welcome to send any sequence of messages in 658 * this array, as processing under this function here is 659 * striving to be agnostic. 660 * 661 * Record the first address and direction we see. If either 662 * changes for a subsequent message, generate ReSTART. The 663 * DW_apb_i2c databook, v1.21a, specifies that ReSTART is 664 * generated when the direction changes, with the default IP 665 * block parameter settings, but it doesn't specify if ReSTART 666 * is generated when the address changes (possibly...). We 667 * don't rely on the default IP block parameter settings as 668 * the block is shared and they may change. 669 */ 670 if (num > 0) { 671 addr = msg[0].addr; 672 dir = msg[0].flags & I2C_M_RD; 673 } 674 675 for (i = 0; i < num; i++) { 676 u32 i2c_flag = 0; 677 678 if (msg[i].addr != addr || (msg[i].flags ^ dir) & I2C_M_RD) { 679 addr = msg[i].addr; 680 dir = msg[i].flags & I2C_M_RD; 681 i2c_flag |= I2C_X_RESTART; 682 } 683 684 if (i == num - 1) { 685 /* Set the STOP bit on the last message, so 686 * that the IP block generates a STOP after 687 * the last byte of the message. 688 */ 689 i2c_flag |= I2C_M_STOP; 690 } 691 692 if (msg[i].flags & I2C_M_RD) 693 ret = smu_v11_0_i2c_read_data(i2c_adap, 694 msg + i, 695 i2c_flag); 696 else 697 ret = smu_v11_0_i2c_write_data(i2c_adap, 698 msg + i, 699 i2c_flag); 700 701 if (ret != I2C_OK) { 702 num = -EIO; 703 break; 704 } 705 } 706 707 smu_v11_0_i2c_fini(i2c_adap); 708 return num; 709 } 710 smu_v11_0_i2c_func(struct i2c_adapter * adap)711 static u32 smu_v11_0_i2c_func(struct i2c_adapter *adap) 712 { 713 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; 714 } 715 716 static const struct i2c_algorithm smu_v11_0_i2c_algo = { 717 .master_xfer = smu_v11_0_i2c_xfer, 718 .functionality = smu_v11_0_i2c_func, 719 }; 720 721 static const struct i2c_adapter_quirks smu_v11_0_i2c_control_quirks = { 722 .flags = I2C_AQ_NO_ZERO_LEN, 723 }; 724 smu_v11_0_i2c_control_init(struct amdgpu_device * adev)725 int smu_v11_0_i2c_control_init(struct amdgpu_device *adev) 726 { 727 struct amdgpu_smu_i2c_bus *smu_i2c = &adev->pm.smu_i2c[0]; 728 struct i2c_adapter *control = &smu_i2c->adapter; 729 int res; 730 731 smu_i2c->adev = adev; 732 smu_i2c->port = 0; 733 mutex_init(&smu_i2c->mutex); 734 control->owner = THIS_MODULE; 735 control->class = I2C_CLASS_HWMON; 736 control->dev.parent = &adev->pdev->dev; 737 control->algo = &smu_v11_0_i2c_algo; 738 snprintf(control->name, sizeof(control->name), "AMDGPU SMU 0"); 739 control->lock_ops = &smu_v11_0_i2c_i2c_lock_ops; 740 control->quirks = &smu_v11_0_i2c_control_quirks; 741 i2c_set_adapdata(control, smu_i2c); 742 743 adev->pm.ras_eeprom_i2c_bus = &adev->pm.smu_i2c[0].adapter; 744 adev->pm.fru_eeprom_i2c_bus = &adev->pm.smu_i2c[0].adapter; 745 746 res = i2c_add_adapter(control); 747 if (res) 748 DRM_ERROR("Failed to register hw i2c, err: %d\n", res); 749 750 return res; 751 } 752 smu_v11_0_i2c_control_fini(struct amdgpu_device * adev)753 void smu_v11_0_i2c_control_fini(struct amdgpu_device *adev) 754 { 755 struct i2c_adapter *control = adev->pm.ras_eeprom_i2c_bus; 756 757 i2c_del_adapter(control); 758 adev->pm.ras_eeprom_i2c_bus = NULL; 759 adev->pm.fru_eeprom_i2c_bus = NULL; 760 } 761 762 /* 763 * Keep this for future unit test if bugs arise 764 */ 765 #if 0 766 #define I2C_TARGET_ADDR 0xA0 767 768 bool smu_v11_0_i2c_test_bus(struct i2c_adapter *control) 769 { 770 771 uint32_t ret = I2C_OK; 772 uint8_t data[6] = {0xf, 0, 0xde, 0xad, 0xbe, 0xef}; 773 774 775 DRM_INFO("Begin"); 776 777 if (!smu_v11_0_i2c_bus_lock(control)) { 778 DRM_ERROR("Failed to lock the bus!."); 779 return false; 780 } 781 782 smu_v11_0_i2c_init(control); 783 784 /* Write 0xde to address 0x0000 on the EEPROM */ 785 ret = smu_v11_0_i2c_write_data(control, I2C_TARGET_ADDR, data, 6); 786 787 ret = smu_v11_0_i2c_read_data(control, I2C_TARGET_ADDR, data, 6); 788 789 smu_v11_0_i2c_fini(control); 790 791 smu_v11_0_i2c_bus_unlock(control); 792 793 794 DRM_INFO("End"); 795 return true; 796 } 797 #endif 798