1 /* 2 * ARM Aspeed I2C controller 3 * 4 * Copyright (C) 2016 IBM Corp. 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 2 9 * of the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, see <http://www.gnu.org/licenses/>. 18 * 19 */ 20 21 #include "qemu/osdep.h" 22 #include "hw/sysbus.h" 23 #include "migration/vmstate.h" 24 #include "qemu/log.h" 25 #include "qemu/module.h" 26 #include "qemu/error-report.h" 27 #include "qapi/error.h" 28 #include "hw/i2c/aspeed_i2c.h" 29 #include "hw/irq.h" 30 #include "hw/qdev-properties.h" 31 #include "trace.h" 32 33 /* I2C Global Register */ 34 35 #define I2C_CTRL_STATUS 0x00 /* Device Interrupt Status */ 36 #define I2C_CTRL_ASSIGN 0x08 /* Device Interrupt Target 37 Assignment */ 38 #define I2C_CTRL_GLOBAL 0x0C /* Global Control Register */ 39 #define I2C_CTRL_SRAM_EN BIT(0) 40 41 /* I2C Device (Bus) Register */ 42 43 #define I2CD_FUN_CTRL_REG 0x00 /* I2CD Function Control */ 44 #define I2CD_POOL_PAGE_SEL(x) (((x) >> 20) & 0x7) /* AST2400 */ 45 #define I2CD_M_SDA_LOCK_EN (0x1 << 16) 46 #define I2CD_MULTI_MASTER_DIS (0x1 << 15) 47 #define I2CD_M_SCL_DRIVE_EN (0x1 << 14) 48 #define I2CD_MSB_STS (0x1 << 9) 49 #define I2CD_SDA_DRIVE_1T_EN (0x1 << 8) 50 #define I2CD_M_SDA_DRIVE_1T_EN (0x1 << 7) 51 #define I2CD_M_HIGH_SPEED_EN (0x1 << 6) 52 #define I2CD_DEF_ADDR_EN (0x1 << 5) 53 #define I2CD_DEF_ALERT_EN (0x1 << 4) 54 #define I2CD_DEF_ARP_EN (0x1 << 3) 55 #define I2CD_DEF_GCALL_EN (0x1 << 2) 56 #define I2CD_SLAVE_EN (0x1 << 1) 57 #define I2CD_MASTER_EN (0x1) 58 59 #define I2CD_AC_TIMING_REG1 0x04 /* Clock and AC Timing Control #1 */ 60 #define I2CD_AC_TIMING_REG2 0x08 /* Clock and AC Timing Control #1 */ 61 #define I2CD_INTR_CTRL_REG 0x0c /* I2CD Interrupt Control */ 62 #define I2CD_INTR_STS_REG 0x10 /* I2CD Interrupt Status */ 63 64 #define I2CD_INTR_SLAVE_ADDR_MATCH (0x1 << 31) /* 0: addr1 1: addr2 */ 65 #define I2CD_INTR_SLAVE_ADDR_RX_PENDING (0x1 << 30) 66 /* bits[19-16] Reserved */ 67 68 /* All bits below are cleared by writing 1 */ 69 #define I2CD_INTR_SLAVE_INACTIVE_TIMEOUT (0x1 << 15) 70 #define I2CD_INTR_SDA_DL_TIMEOUT (0x1 << 14) 71 #define I2CD_INTR_BUS_RECOVER_DONE (0x1 << 13) 72 #define I2CD_INTR_SMBUS_ALERT (0x1 << 12) /* Bus [0-3] only */ 73 #define I2CD_INTR_SMBUS_ARP_ADDR (0x1 << 11) /* Removed */ 74 #define I2CD_INTR_SMBUS_DEV_ALERT_ADDR (0x1 << 10) /* Removed */ 75 #define I2CD_INTR_SMBUS_DEF_ADDR (0x1 << 9) /* Removed */ 76 #define I2CD_INTR_GCALL_ADDR (0x1 << 8) /* Removed */ 77 #define I2CD_INTR_SLAVE_ADDR_RX_MATCH (0x1 << 7) /* use RX_DONE */ 78 #define I2CD_INTR_SCL_TIMEOUT (0x1 << 6) 79 #define I2CD_INTR_ABNORMAL (0x1 << 5) 80 #define I2CD_INTR_NORMAL_STOP (0x1 << 4) 81 #define I2CD_INTR_ARBIT_LOSS (0x1 << 3) 82 #define I2CD_INTR_RX_DONE (0x1 << 2) 83 #define I2CD_INTR_TX_NAK (0x1 << 1) 84 #define I2CD_INTR_TX_ACK (0x1 << 0) 85 86 #define I2CD_CMD_REG 0x14 /* I2CD Command/Status */ 87 #define I2CD_SDA_OE (0x1 << 28) 88 #define I2CD_SDA_O (0x1 << 27) 89 #define I2CD_SCL_OE (0x1 << 26) 90 #define I2CD_SCL_O (0x1 << 25) 91 #define I2CD_TX_TIMING (0x1 << 24) 92 #define I2CD_TX_STATUS (0x1 << 23) 93 94 #define I2CD_TX_STATE_SHIFT 19 /* Tx State Machine */ 95 #define I2CD_TX_STATE_MASK 0xf 96 #define I2CD_IDLE 0x0 97 #define I2CD_MACTIVE 0x8 98 #define I2CD_MSTART 0x9 99 #define I2CD_MSTARTR 0xa 100 #define I2CD_MSTOP 0xb 101 #define I2CD_MTXD 0xc 102 #define I2CD_MRXACK 0xd 103 #define I2CD_MRXD 0xe 104 #define I2CD_MTXACK 0xf 105 #define I2CD_SWAIT 0x1 106 #define I2CD_SRXD 0x4 107 #define I2CD_STXACK 0x5 108 #define I2CD_STXD 0x6 109 #define I2CD_SRXACK 0x7 110 #define I2CD_RECOVER 0x3 111 112 #define I2CD_SCL_LINE_STS (0x1 << 18) 113 #define I2CD_SDA_LINE_STS (0x1 << 17) 114 #define I2CD_BUS_BUSY_STS (0x1 << 16) 115 #define I2CD_SDA_OE_OUT_DIR (0x1 << 15) 116 #define I2CD_SDA_O_OUT_DIR (0x1 << 14) 117 #define I2CD_SCL_OE_OUT_DIR (0x1 << 13) 118 #define I2CD_SCL_O_OUT_DIR (0x1 << 12) 119 #define I2CD_BUS_RECOVER_CMD_EN (0x1 << 11) 120 #define I2CD_S_ALT_EN (0x1 << 10) 121 122 /* Command Bit */ 123 #define I2CD_RX_DMA_ENABLE (0x1 << 9) 124 #define I2CD_TX_DMA_ENABLE (0x1 << 8) 125 #define I2CD_RX_BUFF_ENABLE (0x1 << 7) 126 #define I2CD_TX_BUFF_ENABLE (0x1 << 6) 127 #define I2CD_M_STOP_CMD (0x1 << 5) 128 #define I2CD_M_S_RX_CMD_LAST (0x1 << 4) 129 #define I2CD_M_RX_CMD (0x1 << 3) 130 #define I2CD_S_TX_CMD (0x1 << 2) 131 #define I2CD_M_TX_CMD (0x1 << 1) 132 #define I2CD_M_START_CMD (0x1) 133 134 #define I2CD_DEV_ADDR_REG 0x18 /* Slave Device Address */ 135 #define I2CD_POOL_CTRL_REG 0x1c /* Pool Buffer Control */ 136 #define I2CD_POOL_RX_COUNT(x) (((x) >> 24) & 0xff) 137 #define I2CD_POOL_RX_SIZE(x) ((((x) >> 16) & 0xff) + 1) 138 #define I2CD_POOL_TX_COUNT(x) ((((x) >> 8) & 0xff) + 1) 139 #define I2CD_POOL_OFFSET(x) (((x) & 0x3f) << 2) /* AST2400 */ 140 #define I2CD_BYTE_BUF_REG 0x20 /* Transmit/Receive Byte Buffer */ 141 #define I2CD_BYTE_BUF_TX_SHIFT 0 142 #define I2CD_BYTE_BUF_TX_MASK 0xff 143 #define I2CD_BYTE_BUF_RX_SHIFT 8 144 #define I2CD_BYTE_BUF_RX_MASK 0xff 145 #define I2CD_DMA_ADDR 0x24 /* DMA Buffer Address */ 146 #define I2CD_DMA_LEN 0x28 /* DMA Transfer Length < 4KB */ 147 148 static inline bool aspeed_i2c_bus_is_master(AspeedI2CBus *bus) 149 { 150 return bus->ctrl & I2CD_MASTER_EN; 151 } 152 153 static inline bool aspeed_i2c_bus_is_enabled(AspeedI2CBus *bus) 154 { 155 return bus->ctrl & (I2CD_MASTER_EN | I2CD_SLAVE_EN); 156 } 157 158 static inline void aspeed_i2c_bus_raise_interrupt(AspeedI2CBus *bus) 159 { 160 AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(bus->controller); 161 162 trace_aspeed_i2c_bus_raise_interrupt(bus->intr_status, 163 bus->intr_status & I2CD_INTR_TX_NAK ? "nak|" : "", 164 bus->intr_status & I2CD_INTR_TX_ACK ? "ack|" : "", 165 bus->intr_status & I2CD_INTR_RX_DONE ? "done|" : "", 166 bus->intr_status & I2CD_INTR_NORMAL_STOP ? "normal|" : "", 167 bus->intr_status & I2CD_INTR_ABNORMAL ? "abnormal" : ""); 168 169 bus->intr_status &= bus->intr_ctrl; 170 if (bus->intr_status) { 171 bus->controller->intr_status |= 1 << bus->id; 172 qemu_irq_raise(aic->bus_get_irq(bus)); 173 } 174 } 175 176 static uint64_t aspeed_i2c_bus_read(void *opaque, hwaddr offset, 177 unsigned size) 178 { 179 AspeedI2CBus *bus = opaque; 180 AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(bus->controller); 181 uint64_t value = -1; 182 183 switch (offset) { 184 case I2CD_FUN_CTRL_REG: 185 value = bus->ctrl; 186 break; 187 case I2CD_AC_TIMING_REG1: 188 value = bus->timing[0]; 189 break; 190 case I2CD_AC_TIMING_REG2: 191 value = bus->timing[1]; 192 break; 193 case I2CD_INTR_CTRL_REG: 194 value = bus->intr_ctrl; 195 break; 196 case I2CD_INTR_STS_REG: 197 value = bus->intr_status; 198 break; 199 case I2CD_POOL_CTRL_REG: 200 value = bus->pool_ctrl; 201 break; 202 case I2CD_BYTE_BUF_REG: 203 value = bus->buf; 204 break; 205 case I2CD_CMD_REG: 206 value = bus->cmd | (i2c_bus_busy(bus->bus) << 16); 207 break; 208 case I2CD_DMA_ADDR: 209 if (!aic->has_dma) { 210 qemu_log_mask(LOG_GUEST_ERROR, "%s: No DMA support\n", __func__); 211 break; 212 } 213 value = bus->dma_addr; 214 break; 215 case I2CD_DMA_LEN: 216 if (!aic->has_dma) { 217 qemu_log_mask(LOG_GUEST_ERROR, "%s: No DMA support\n", __func__); 218 break; 219 } 220 value = bus->dma_len; 221 break; 222 223 default: 224 qemu_log_mask(LOG_GUEST_ERROR, 225 "%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, offset); 226 value = -1; 227 break; 228 } 229 230 trace_aspeed_i2c_bus_read(bus->id, offset, size, value); 231 return value; 232 } 233 234 static void aspeed_i2c_set_state(AspeedI2CBus *bus, uint8_t state) 235 { 236 bus->cmd &= ~(I2CD_TX_STATE_MASK << I2CD_TX_STATE_SHIFT); 237 bus->cmd |= (state & I2CD_TX_STATE_MASK) << I2CD_TX_STATE_SHIFT; 238 } 239 240 static uint8_t aspeed_i2c_get_state(AspeedI2CBus *bus) 241 { 242 return (bus->cmd >> I2CD_TX_STATE_SHIFT) & I2CD_TX_STATE_MASK; 243 } 244 245 static int aspeed_i2c_dma_read(AspeedI2CBus *bus, uint8_t *data) 246 { 247 MemTxResult result; 248 AspeedI2CState *s = bus->controller; 249 250 result = address_space_read(&s->dram_as, bus->dma_addr, 251 MEMTXATTRS_UNSPECIFIED, data, 1); 252 if (result != MEMTX_OK) { 253 qemu_log_mask(LOG_GUEST_ERROR, "%s: DRAM read failed @%08x\n", 254 __func__, bus->dma_addr); 255 return -1; 256 } 257 258 bus->dma_addr++; 259 bus->dma_len--; 260 return 0; 261 } 262 263 static int aspeed_i2c_bus_send(AspeedI2CBus *bus, uint8_t pool_start) 264 { 265 AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(bus->controller); 266 int ret = -1; 267 int i; 268 269 if (bus->cmd & I2CD_TX_BUFF_ENABLE) { 270 for (i = pool_start; i < I2CD_POOL_TX_COUNT(bus->pool_ctrl); i++) { 271 uint8_t *pool_base = aic->bus_pool_base(bus); 272 273 trace_aspeed_i2c_bus_send("BUF", i + 1, 274 I2CD_POOL_TX_COUNT(bus->pool_ctrl), 275 pool_base[i]); 276 ret = i2c_send(bus->bus, pool_base[i]); 277 if (ret) { 278 break; 279 } 280 } 281 bus->cmd &= ~I2CD_TX_BUFF_ENABLE; 282 } else if (bus->cmd & I2CD_TX_DMA_ENABLE) { 283 while (bus->dma_len) { 284 uint8_t data; 285 aspeed_i2c_dma_read(bus, &data); 286 trace_aspeed_i2c_bus_send("DMA", bus->dma_len, bus->dma_len, data); 287 ret = i2c_send(bus->bus, data); 288 if (ret) { 289 break; 290 } 291 } 292 bus->cmd &= ~I2CD_TX_DMA_ENABLE; 293 } else { 294 trace_aspeed_i2c_bus_send("BYTE", pool_start, 1, bus->buf); 295 ret = i2c_send(bus->bus, bus->buf); 296 } 297 298 return ret; 299 } 300 301 static void aspeed_i2c_bus_recv(AspeedI2CBus *bus) 302 { 303 AspeedI2CState *s = bus->controller; 304 AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(s); 305 uint8_t data; 306 int i; 307 308 if (bus->cmd & I2CD_RX_BUFF_ENABLE) { 309 uint8_t *pool_base = aic->bus_pool_base(bus); 310 311 for (i = 0; i < I2CD_POOL_RX_SIZE(bus->pool_ctrl); i++) { 312 pool_base[i] = i2c_recv(bus->bus); 313 trace_aspeed_i2c_bus_recv("BUF", i + 1, 314 I2CD_POOL_RX_SIZE(bus->pool_ctrl), 315 pool_base[i]); 316 } 317 318 /* Update RX count */ 319 bus->pool_ctrl &= ~(0xff << 24); 320 bus->pool_ctrl |= (i & 0xff) << 24; 321 bus->cmd &= ~I2CD_RX_BUFF_ENABLE; 322 } else if (bus->cmd & I2CD_RX_DMA_ENABLE) { 323 uint8_t data; 324 325 while (bus->dma_len) { 326 MemTxResult result; 327 328 data = i2c_recv(bus->bus); 329 trace_aspeed_i2c_bus_recv("DMA", bus->dma_len, bus->dma_len, data); 330 result = address_space_write(&s->dram_as, bus->dma_addr, 331 MEMTXATTRS_UNSPECIFIED, &data, 1); 332 if (result != MEMTX_OK) { 333 qemu_log_mask(LOG_GUEST_ERROR, "%s: DRAM write failed @%08x\n", 334 __func__, bus->dma_addr); 335 return; 336 } 337 bus->dma_addr++; 338 bus->dma_len--; 339 } 340 bus->cmd &= ~I2CD_RX_DMA_ENABLE; 341 } else { 342 data = i2c_recv(bus->bus); 343 trace_aspeed_i2c_bus_recv("BYTE", 1, 1, bus->buf); 344 bus->buf = (data & I2CD_BYTE_BUF_RX_MASK) << I2CD_BYTE_BUF_RX_SHIFT; 345 } 346 } 347 348 static void aspeed_i2c_handle_rx_cmd(AspeedI2CBus *bus) 349 { 350 aspeed_i2c_set_state(bus, I2CD_MRXD); 351 aspeed_i2c_bus_recv(bus); 352 bus->intr_status |= I2CD_INTR_RX_DONE; 353 if (bus->cmd & I2CD_M_S_RX_CMD_LAST) { 354 i2c_nack(bus->bus); 355 } 356 bus->cmd &= ~(I2CD_M_RX_CMD | I2CD_M_S_RX_CMD_LAST); 357 aspeed_i2c_set_state(bus, I2CD_MACTIVE); 358 } 359 360 static uint8_t aspeed_i2c_get_addr(AspeedI2CBus *bus) 361 { 362 AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(bus->controller); 363 364 if (bus->cmd & I2CD_TX_BUFF_ENABLE) { 365 uint8_t *pool_base = aic->bus_pool_base(bus); 366 367 return pool_base[0]; 368 } else if (bus->cmd & I2CD_TX_DMA_ENABLE) { 369 uint8_t data; 370 371 aspeed_i2c_dma_read(bus, &data); 372 return data; 373 } else { 374 return bus->buf; 375 } 376 } 377 378 static bool aspeed_i2c_check_sram(AspeedI2CBus *bus) 379 { 380 AspeedI2CState *s = bus->controller; 381 AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(s); 382 383 if (!aic->check_sram) { 384 return true; 385 } 386 387 /* 388 * AST2500: SRAM must be enabled before using the Buffer Pool or 389 * DMA mode. 390 */ 391 if (!(s->ctrl_global & I2C_CTRL_SRAM_EN) && 392 (bus->cmd & (I2CD_RX_DMA_ENABLE | I2CD_TX_DMA_ENABLE | 393 I2CD_RX_BUFF_ENABLE | I2CD_TX_BUFF_ENABLE))) { 394 qemu_log_mask(LOG_GUEST_ERROR, "%s: SRAM is not enabled\n", __func__); 395 return false; 396 } 397 398 return true; 399 } 400 401 static void aspeed_i2c_bus_cmd_dump(AspeedI2CBus *bus) 402 { 403 g_autofree char *cmd_flags = NULL; 404 uint32_t count; 405 406 if (bus->cmd & (I2CD_RX_BUFF_ENABLE | I2CD_RX_BUFF_ENABLE)) { 407 count = I2CD_POOL_TX_COUNT(bus->pool_ctrl); 408 } else if (bus->cmd & (I2CD_RX_DMA_ENABLE | I2CD_RX_DMA_ENABLE)) { 409 count = bus->dma_len; 410 } else { /* BYTE mode */ 411 count = 1; 412 } 413 414 cmd_flags = g_strdup_printf("%s%s%s%s%s%s%s%s%s", 415 bus->cmd & I2CD_M_START_CMD ? "start|" : "", 416 bus->cmd & I2CD_RX_DMA_ENABLE ? "rxdma|" : "", 417 bus->cmd & I2CD_TX_DMA_ENABLE ? "txdma|" : "", 418 bus->cmd & I2CD_RX_BUFF_ENABLE ? "rxbuf|" : "", 419 bus->cmd & I2CD_TX_BUFF_ENABLE ? "txbuf|" : "", 420 bus->cmd & I2CD_M_TX_CMD ? "tx|" : "", 421 bus->cmd & I2CD_M_RX_CMD ? "rx|" : "", 422 bus->cmd & I2CD_M_S_RX_CMD_LAST ? "last|" : "", 423 bus->cmd & I2CD_M_STOP_CMD ? "stop" : ""); 424 425 trace_aspeed_i2c_bus_cmd(bus->cmd, cmd_flags, count, bus->intr_status); 426 } 427 428 /* 429 * The state machine needs some refinement. It is only used to track 430 * invalid STOP commands for the moment. 431 */ 432 static void aspeed_i2c_bus_handle_cmd(AspeedI2CBus *bus, uint64_t value) 433 { 434 uint8_t pool_start = 0; 435 436 bus->cmd &= ~0xFFFF; 437 bus->cmd |= value & 0xFFFF; 438 439 if (!aspeed_i2c_check_sram(bus)) { 440 return; 441 } 442 443 if (trace_event_get_state_backends(TRACE_ASPEED_I2C_BUS_CMD)) { 444 aspeed_i2c_bus_cmd_dump(bus); 445 } 446 447 if (bus->cmd & I2CD_M_START_CMD) { 448 uint8_t state = aspeed_i2c_get_state(bus) & I2CD_MACTIVE ? 449 I2CD_MSTARTR : I2CD_MSTART; 450 uint8_t addr; 451 452 aspeed_i2c_set_state(bus, state); 453 454 addr = aspeed_i2c_get_addr(bus); 455 456 if (i2c_start_transfer(bus->bus, extract32(addr, 1, 7), 457 extract32(addr, 0, 1))) { 458 bus->intr_status |= I2CD_INTR_TX_NAK; 459 } else { 460 bus->intr_status |= I2CD_INTR_TX_ACK; 461 } 462 463 bus->cmd &= ~I2CD_M_START_CMD; 464 465 /* 466 * The START command is also a TX command, as the slave 467 * address is sent on the bus. Drop the TX flag if nothing 468 * else needs to be sent in this sequence. 469 */ 470 if (bus->cmd & I2CD_TX_BUFF_ENABLE) { 471 if (I2CD_POOL_TX_COUNT(bus->pool_ctrl) == 1) { 472 bus->cmd &= ~I2CD_M_TX_CMD; 473 } else { 474 /* 475 * Increase the start index in the TX pool buffer to 476 * skip the address byte. 477 */ 478 pool_start++; 479 } 480 } else if (bus->cmd & I2CD_TX_DMA_ENABLE) { 481 if (bus->dma_len == 0) { 482 bus->cmd &= ~I2CD_M_TX_CMD; 483 } 484 } else { 485 bus->cmd &= ~I2CD_M_TX_CMD; 486 } 487 488 /* No slave found */ 489 if (!i2c_bus_busy(bus->bus)) { 490 return; 491 } 492 aspeed_i2c_set_state(bus, I2CD_MACTIVE); 493 } 494 495 if (bus->cmd & I2CD_M_TX_CMD) { 496 aspeed_i2c_set_state(bus, I2CD_MTXD); 497 if (aspeed_i2c_bus_send(bus, pool_start)) { 498 bus->intr_status |= (I2CD_INTR_TX_NAK); 499 i2c_end_transfer(bus->bus); 500 } else { 501 bus->intr_status |= I2CD_INTR_TX_ACK; 502 } 503 bus->cmd &= ~I2CD_M_TX_CMD; 504 aspeed_i2c_set_state(bus, I2CD_MACTIVE); 505 } 506 507 if ((bus->cmd & (I2CD_M_RX_CMD | I2CD_M_S_RX_CMD_LAST)) && 508 !(bus->intr_status & I2CD_INTR_RX_DONE)) { 509 aspeed_i2c_handle_rx_cmd(bus); 510 } 511 512 if (bus->cmd & I2CD_M_STOP_CMD) { 513 if (!(aspeed_i2c_get_state(bus) & I2CD_MACTIVE)) { 514 qemu_log_mask(LOG_GUEST_ERROR, "%s: abnormal stop\n", __func__); 515 bus->intr_status |= I2CD_INTR_ABNORMAL; 516 } else { 517 aspeed_i2c_set_state(bus, I2CD_MSTOP); 518 i2c_end_transfer(bus->bus); 519 bus->intr_status |= I2CD_INTR_NORMAL_STOP; 520 } 521 bus->cmd &= ~I2CD_M_STOP_CMD; 522 aspeed_i2c_set_state(bus, I2CD_IDLE); 523 } 524 } 525 526 static void aspeed_i2c_bus_write(void *opaque, hwaddr offset, 527 uint64_t value, unsigned size) 528 { 529 AspeedI2CBus *bus = opaque; 530 AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(bus->controller); 531 bool handle_rx; 532 533 trace_aspeed_i2c_bus_write(bus->id, offset, size, value); 534 535 switch (offset) { 536 case I2CD_FUN_CTRL_REG: 537 if (value & I2CD_SLAVE_EN) { 538 qemu_log_mask(LOG_UNIMP, "%s: slave mode not implemented\n", 539 __func__); 540 break; 541 } 542 bus->ctrl = value & 0x0071C3FF; 543 break; 544 case I2CD_AC_TIMING_REG1: 545 bus->timing[0] = value & 0xFFFFF0F; 546 break; 547 case I2CD_AC_TIMING_REG2: 548 bus->timing[1] = value & 0x7; 549 break; 550 case I2CD_INTR_CTRL_REG: 551 bus->intr_ctrl = value & 0x7FFF; 552 break; 553 case I2CD_INTR_STS_REG: 554 handle_rx = (bus->intr_status & I2CD_INTR_RX_DONE) && 555 (value & I2CD_INTR_RX_DONE); 556 bus->intr_status &= ~(value & 0x7FFF); 557 if (!bus->intr_status) { 558 bus->controller->intr_status &= ~(1 << bus->id); 559 qemu_irq_lower(aic->bus_get_irq(bus)); 560 } 561 if (handle_rx && (bus->cmd & (I2CD_M_RX_CMD | I2CD_M_S_RX_CMD_LAST))) { 562 aspeed_i2c_handle_rx_cmd(bus); 563 aspeed_i2c_bus_raise_interrupt(bus); 564 } 565 break; 566 case I2CD_DEV_ADDR_REG: 567 qemu_log_mask(LOG_UNIMP, "%s: slave mode not implemented\n", 568 __func__); 569 break; 570 case I2CD_POOL_CTRL_REG: 571 bus->pool_ctrl &= ~0xffffff; 572 bus->pool_ctrl |= (value & 0xffffff); 573 break; 574 575 case I2CD_BYTE_BUF_REG: 576 bus->buf = (value & I2CD_BYTE_BUF_TX_MASK) << I2CD_BYTE_BUF_TX_SHIFT; 577 break; 578 case I2CD_CMD_REG: 579 if (!aspeed_i2c_bus_is_enabled(bus)) { 580 break; 581 } 582 583 if (!aspeed_i2c_bus_is_master(bus)) { 584 qemu_log_mask(LOG_UNIMP, "%s: slave mode not implemented\n", 585 __func__); 586 break; 587 } 588 589 if (!aic->has_dma && 590 value & (I2CD_RX_DMA_ENABLE | I2CD_TX_DMA_ENABLE)) { 591 qemu_log_mask(LOG_GUEST_ERROR, "%s: No DMA support\n", __func__); 592 break; 593 } 594 595 aspeed_i2c_bus_handle_cmd(bus, value); 596 aspeed_i2c_bus_raise_interrupt(bus); 597 break; 598 case I2CD_DMA_ADDR: 599 if (!aic->has_dma) { 600 qemu_log_mask(LOG_GUEST_ERROR, "%s: No DMA support\n", __func__); 601 break; 602 } 603 604 bus->dma_addr = value & 0xfffffffc; 605 break; 606 607 case I2CD_DMA_LEN: 608 if (!aic->has_dma) { 609 qemu_log_mask(LOG_GUEST_ERROR, "%s: No DMA support\n", __func__); 610 break; 611 } 612 613 bus->dma_len = value & 0xfff; 614 if (!bus->dma_len) { 615 qemu_log_mask(LOG_UNIMP, "%s: invalid DMA length\n", __func__); 616 } 617 break; 618 619 default: 620 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIx "\n", 621 __func__, offset); 622 } 623 } 624 625 static uint64_t aspeed_i2c_ctrl_read(void *opaque, hwaddr offset, 626 unsigned size) 627 { 628 AspeedI2CState *s = opaque; 629 630 switch (offset) { 631 case I2C_CTRL_STATUS: 632 return s->intr_status; 633 case I2C_CTRL_GLOBAL: 634 return s->ctrl_global; 635 default: 636 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIx "\n", 637 __func__, offset); 638 break; 639 } 640 641 return -1; 642 } 643 644 static void aspeed_i2c_ctrl_write(void *opaque, hwaddr offset, 645 uint64_t value, unsigned size) 646 { 647 AspeedI2CState *s = opaque; 648 649 switch (offset) { 650 case I2C_CTRL_GLOBAL: 651 s->ctrl_global = value; 652 break; 653 case I2C_CTRL_STATUS: 654 default: 655 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIx "\n", 656 __func__, offset); 657 break; 658 } 659 } 660 661 static const MemoryRegionOps aspeed_i2c_bus_ops = { 662 .read = aspeed_i2c_bus_read, 663 .write = aspeed_i2c_bus_write, 664 .endianness = DEVICE_LITTLE_ENDIAN, 665 }; 666 667 static const MemoryRegionOps aspeed_i2c_ctrl_ops = { 668 .read = aspeed_i2c_ctrl_read, 669 .write = aspeed_i2c_ctrl_write, 670 .endianness = DEVICE_LITTLE_ENDIAN, 671 }; 672 673 static uint64_t aspeed_i2c_pool_read(void *opaque, hwaddr offset, 674 unsigned size) 675 { 676 AspeedI2CState *s = opaque; 677 uint64_t ret = 0; 678 int i; 679 680 for (i = 0; i < size; i++) { 681 ret |= (uint64_t) s->pool[offset + i] << (8 * i); 682 } 683 684 return ret; 685 } 686 687 static void aspeed_i2c_pool_write(void *opaque, hwaddr offset, 688 uint64_t value, unsigned size) 689 { 690 AspeedI2CState *s = opaque; 691 int i; 692 693 for (i = 0; i < size; i++) { 694 s->pool[offset + i] = (value >> (8 * i)) & 0xFF; 695 } 696 } 697 698 static const MemoryRegionOps aspeed_i2c_pool_ops = { 699 .read = aspeed_i2c_pool_read, 700 .write = aspeed_i2c_pool_write, 701 .endianness = DEVICE_LITTLE_ENDIAN, 702 .valid = { 703 .min_access_size = 1, 704 .max_access_size = 4, 705 }, 706 }; 707 708 static const VMStateDescription aspeed_i2c_bus_vmstate = { 709 .name = TYPE_ASPEED_I2C, 710 .version_id = 3, 711 .minimum_version_id = 3, 712 .fields = (VMStateField[]) { 713 VMSTATE_UINT8(id, AspeedI2CBus), 714 VMSTATE_UINT32(ctrl, AspeedI2CBus), 715 VMSTATE_UINT32_ARRAY(timing, AspeedI2CBus, 2), 716 VMSTATE_UINT32(intr_ctrl, AspeedI2CBus), 717 VMSTATE_UINT32(intr_status, AspeedI2CBus), 718 VMSTATE_UINT32(cmd, AspeedI2CBus), 719 VMSTATE_UINT32(buf, AspeedI2CBus), 720 VMSTATE_UINT32(pool_ctrl, AspeedI2CBus), 721 VMSTATE_UINT32(dma_addr, AspeedI2CBus), 722 VMSTATE_UINT32(dma_len, AspeedI2CBus), 723 VMSTATE_END_OF_LIST() 724 } 725 }; 726 727 static const VMStateDescription aspeed_i2c_vmstate = { 728 .name = TYPE_ASPEED_I2C, 729 .version_id = 2, 730 .minimum_version_id = 2, 731 .fields = (VMStateField[]) { 732 VMSTATE_UINT32(intr_status, AspeedI2CState), 733 VMSTATE_STRUCT_ARRAY(busses, AspeedI2CState, 734 ASPEED_I2C_NR_BUSSES, 1, aspeed_i2c_bus_vmstate, 735 AspeedI2CBus), 736 VMSTATE_UINT8_ARRAY(pool, AspeedI2CState, ASPEED_I2C_MAX_POOL_SIZE), 737 VMSTATE_END_OF_LIST() 738 } 739 }; 740 741 static void aspeed_i2c_reset(DeviceState *dev) 742 { 743 int i; 744 AspeedI2CState *s = ASPEED_I2C(dev); 745 AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(s); 746 747 s->intr_status = 0; 748 749 for (i = 0; i < aic->num_busses; i++) { 750 s->busses[i].intr_ctrl = 0; 751 s->busses[i].intr_status = 0; 752 s->busses[i].cmd = 0; 753 s->busses[i].buf = 0; 754 s->busses[i].dma_addr = 0; 755 s->busses[i].dma_len = 0; 756 i2c_end_transfer(s->busses[i].bus); 757 } 758 } 759 760 /* 761 * Address Definitions (AST2400 and AST2500) 762 * 763 * 0x000 ... 0x03F: Global Register 764 * 0x040 ... 0x07F: Device 1 765 * 0x080 ... 0x0BF: Device 2 766 * 0x0C0 ... 0x0FF: Device 3 767 * 0x100 ... 0x13F: Device 4 768 * 0x140 ... 0x17F: Device 5 769 * 0x180 ... 0x1BF: Device 6 770 * 0x1C0 ... 0x1FF: Device 7 771 * 0x200 ... 0x2FF: Buffer Pool (unused in linux driver) 772 * 0x300 ... 0x33F: Device 8 773 * 0x340 ... 0x37F: Device 9 774 * 0x380 ... 0x3BF: Device 10 775 * 0x3C0 ... 0x3FF: Device 11 776 * 0x400 ... 0x43F: Device 12 777 * 0x440 ... 0x47F: Device 13 778 * 0x480 ... 0x4BF: Device 14 779 * 0x800 ... 0xFFF: Buffer Pool (unused in linux driver) 780 */ 781 static void aspeed_i2c_realize(DeviceState *dev, Error **errp) 782 { 783 int i; 784 SysBusDevice *sbd = SYS_BUS_DEVICE(dev); 785 AspeedI2CState *s = ASPEED_I2C(dev); 786 AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(s); 787 788 sysbus_init_irq(sbd, &s->irq); 789 memory_region_init_io(&s->iomem, OBJECT(s), &aspeed_i2c_ctrl_ops, s, 790 "aspeed.i2c", 0x1000); 791 sysbus_init_mmio(sbd, &s->iomem); 792 793 for (i = 0; i < aic->num_busses; i++) { 794 char name[32]; 795 int offset = i < aic->gap ? 1 : 5; 796 797 sysbus_init_irq(sbd, &s->busses[i].irq); 798 snprintf(name, sizeof(name), "aspeed.i2c.%d", i); 799 s->busses[i].controller = s; 800 s->busses[i].id = i; 801 s->busses[i].bus = i2c_init_bus(dev, name); 802 memory_region_init_io(&s->busses[i].mr, OBJECT(dev), 803 &aspeed_i2c_bus_ops, &s->busses[i], name, 804 aic->reg_size); 805 memory_region_add_subregion(&s->iomem, aic->reg_size * (i + offset), 806 &s->busses[i].mr); 807 } 808 809 memory_region_init_io(&s->pool_iomem, OBJECT(s), &aspeed_i2c_pool_ops, s, 810 "aspeed.i2c-pool", aic->pool_size); 811 memory_region_add_subregion(&s->iomem, aic->pool_base, &s->pool_iomem); 812 813 if (aic->has_dma) { 814 if (!s->dram_mr) { 815 error_setg(errp, TYPE_ASPEED_I2C ": 'dram' link not set"); 816 return; 817 } 818 819 address_space_init(&s->dram_as, s->dram_mr, "dma-dram"); 820 } 821 } 822 823 static Property aspeed_i2c_properties[] = { 824 DEFINE_PROP_LINK("dram", AspeedI2CState, dram_mr, 825 TYPE_MEMORY_REGION, MemoryRegion *), 826 DEFINE_PROP_END_OF_LIST(), 827 }; 828 829 static void aspeed_i2c_class_init(ObjectClass *klass, void *data) 830 { 831 DeviceClass *dc = DEVICE_CLASS(klass); 832 833 dc->vmsd = &aspeed_i2c_vmstate; 834 dc->reset = aspeed_i2c_reset; 835 device_class_set_props(dc, aspeed_i2c_properties); 836 dc->realize = aspeed_i2c_realize; 837 dc->desc = "Aspeed I2C Controller"; 838 } 839 840 static const TypeInfo aspeed_i2c_info = { 841 .name = TYPE_ASPEED_I2C, 842 .parent = TYPE_SYS_BUS_DEVICE, 843 .instance_size = sizeof(AspeedI2CState), 844 .class_init = aspeed_i2c_class_init, 845 .class_size = sizeof(AspeedI2CClass), 846 .abstract = true, 847 }; 848 849 static qemu_irq aspeed_2400_i2c_bus_get_irq(AspeedI2CBus *bus) 850 { 851 return bus->controller->irq; 852 } 853 854 static uint8_t *aspeed_2400_i2c_bus_pool_base(AspeedI2CBus *bus) 855 { 856 uint8_t *pool_page = 857 &bus->controller->pool[I2CD_POOL_PAGE_SEL(bus->ctrl) * 0x100]; 858 859 return &pool_page[I2CD_POOL_OFFSET(bus->pool_ctrl)]; 860 } 861 862 static void aspeed_2400_i2c_class_init(ObjectClass *klass, void *data) 863 { 864 DeviceClass *dc = DEVICE_CLASS(klass); 865 AspeedI2CClass *aic = ASPEED_I2C_CLASS(klass); 866 867 dc->desc = "ASPEED 2400 I2C Controller"; 868 869 aic->num_busses = 14; 870 aic->reg_size = 0x40; 871 aic->gap = 7; 872 aic->bus_get_irq = aspeed_2400_i2c_bus_get_irq; 873 aic->pool_size = 0x800; 874 aic->pool_base = 0x800; 875 aic->bus_pool_base = aspeed_2400_i2c_bus_pool_base; 876 } 877 878 static const TypeInfo aspeed_2400_i2c_info = { 879 .name = TYPE_ASPEED_2400_I2C, 880 .parent = TYPE_ASPEED_I2C, 881 .class_init = aspeed_2400_i2c_class_init, 882 }; 883 884 static qemu_irq aspeed_2500_i2c_bus_get_irq(AspeedI2CBus *bus) 885 { 886 return bus->controller->irq; 887 } 888 889 static uint8_t *aspeed_2500_i2c_bus_pool_base(AspeedI2CBus *bus) 890 { 891 return &bus->controller->pool[bus->id * 0x10]; 892 } 893 894 static void aspeed_2500_i2c_class_init(ObjectClass *klass, void *data) 895 { 896 DeviceClass *dc = DEVICE_CLASS(klass); 897 AspeedI2CClass *aic = ASPEED_I2C_CLASS(klass); 898 899 dc->desc = "ASPEED 2500 I2C Controller"; 900 901 aic->num_busses = 14; 902 aic->reg_size = 0x40; 903 aic->gap = 7; 904 aic->bus_get_irq = aspeed_2500_i2c_bus_get_irq; 905 aic->pool_size = 0x100; 906 aic->pool_base = 0x200; 907 aic->bus_pool_base = aspeed_2500_i2c_bus_pool_base; 908 aic->check_sram = true; 909 aic->has_dma = true; 910 } 911 912 static const TypeInfo aspeed_2500_i2c_info = { 913 .name = TYPE_ASPEED_2500_I2C, 914 .parent = TYPE_ASPEED_I2C, 915 .class_init = aspeed_2500_i2c_class_init, 916 }; 917 918 static qemu_irq aspeed_2600_i2c_bus_get_irq(AspeedI2CBus *bus) 919 { 920 return bus->irq; 921 } 922 923 static uint8_t *aspeed_2600_i2c_bus_pool_base(AspeedI2CBus *bus) 924 { 925 return &bus->controller->pool[bus->id * 0x20]; 926 } 927 928 static void aspeed_2600_i2c_class_init(ObjectClass *klass, void *data) 929 { 930 DeviceClass *dc = DEVICE_CLASS(klass); 931 AspeedI2CClass *aic = ASPEED_I2C_CLASS(klass); 932 933 dc->desc = "ASPEED 2600 I2C Controller"; 934 935 aic->num_busses = 16; 936 aic->reg_size = 0x80; 937 aic->gap = -1; /* no gap */ 938 aic->bus_get_irq = aspeed_2600_i2c_bus_get_irq; 939 aic->pool_size = 0x200; 940 aic->pool_base = 0xC00; 941 aic->bus_pool_base = aspeed_2600_i2c_bus_pool_base; 942 aic->has_dma = true; 943 } 944 945 static const TypeInfo aspeed_2600_i2c_info = { 946 .name = TYPE_ASPEED_2600_I2C, 947 .parent = TYPE_ASPEED_I2C, 948 .class_init = aspeed_2600_i2c_class_init, 949 }; 950 951 static void aspeed_i2c_register_types(void) 952 { 953 type_register_static(&aspeed_i2c_info); 954 type_register_static(&aspeed_2400_i2c_info); 955 type_register_static(&aspeed_2500_i2c_info); 956 type_register_static(&aspeed_2600_i2c_info); 957 } 958 959 type_init(aspeed_i2c_register_types) 960 961 962 I2CBus *aspeed_i2c_get_bus(DeviceState *dev, int busnr) 963 { 964 AspeedI2CState *s = ASPEED_I2C(dev); 965 AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(s); 966 I2CBus *bus = NULL; 967 968 if (busnr >= 0 && busnr < aic->num_busses) { 969 bus = s->busses[busnr].bus; 970 } 971 972 return bus; 973 } 974