1 /* 2 * QEMU model of the Ibex SPI Controller 3 * SPEC Reference: https://docs.opentitan.org/hw/ip/spi_host/doc/ 4 * 5 * Copyright (C) 2022 Western Digital 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a copy 8 * of this software and associated documentation files (the "Software"), to deal 9 * in the Software without restriction, including without limitation the rights 10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 * copies of the Software, and to permit persons to whom the Software is 12 * furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in 15 * all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 23 * THE SOFTWARE. 24 */ 25 26 #include "qemu/osdep.h" 27 #include "qemu/log.h" 28 #include "qemu/module.h" 29 #include "hw/registerfields.h" 30 #include "hw/ssi/ibex_spi_host.h" 31 #include "hw/irq.h" 32 #include "hw/qdev-properties.h" 33 #include "hw/qdev-properties-system.h" 34 #include "migration/vmstate.h" 35 #include "trace.h" 36 37 REG32(INTR_STATE, 0x00) 38 FIELD(INTR_STATE, ERROR, 0, 1) 39 FIELD(INTR_STATE, SPI_EVENT, 1, 1) 40 REG32(INTR_ENABLE, 0x04) 41 FIELD(INTR_ENABLE, ERROR, 0, 1) 42 FIELD(INTR_ENABLE, SPI_EVENT, 1, 1) 43 REG32(INTR_TEST, 0x08) 44 FIELD(INTR_TEST, ERROR, 0, 1) 45 FIELD(INTR_TEST, SPI_EVENT, 1, 1) 46 REG32(ALERT_TEST, 0x0c) 47 FIELD(ALERT_TEST, FETAL_TEST, 0, 1) 48 REG32(CONTROL, 0x10) 49 FIELD(CONTROL, RX_WATERMARK, 0, 8) 50 FIELD(CONTROL, TX_WATERMARK, 1, 8) 51 FIELD(CONTROL, OUTPUT_EN, 29, 1) 52 FIELD(CONTROL, SW_RST, 30, 1) 53 FIELD(CONTROL, SPIEN, 31, 1) 54 REG32(STATUS, 0x14) 55 FIELD(STATUS, TXQD, 0, 8) 56 FIELD(STATUS, RXQD, 18, 8) 57 FIELD(STATUS, CMDQD, 16, 3) 58 FIELD(STATUS, RXWM, 20, 1) 59 FIELD(STATUS, BYTEORDER, 22, 1) 60 FIELD(STATUS, RXSTALL, 23, 1) 61 FIELD(STATUS, RXEMPTY, 24, 1) 62 FIELD(STATUS, RXFULL, 25, 1) 63 FIELD(STATUS, TXWM, 26, 1) 64 FIELD(STATUS, TXSTALL, 27, 1) 65 FIELD(STATUS, TXEMPTY, 28, 1) 66 FIELD(STATUS, TXFULL, 29, 1) 67 FIELD(STATUS, ACTIVE, 30, 1) 68 FIELD(STATUS, READY, 31, 1) 69 REG32(CONFIGOPTS, 0x18) 70 FIELD(CONFIGOPTS, CLKDIV_0, 0, 16) 71 FIELD(CONFIGOPTS, CSNIDLE_0, 16, 4) 72 FIELD(CONFIGOPTS, CSNTRAIL_0, 20, 4) 73 FIELD(CONFIGOPTS, CSNLEAD_0, 24, 4) 74 FIELD(CONFIGOPTS, FULLCYC_0, 29, 1) 75 FIELD(CONFIGOPTS, CPHA_0, 30, 1) 76 FIELD(CONFIGOPTS, CPOL_0, 31, 1) 77 REG32(CSID, 0x1c) 78 FIELD(CSID, CSID, 0, 32) 79 REG32(COMMAND, 0x20) 80 FIELD(COMMAND, LEN, 0, 8) 81 FIELD(COMMAND, CSAAT, 9, 1) 82 FIELD(COMMAND, SPEED, 10, 2) 83 FIELD(COMMAND, DIRECTION, 12, 2) 84 REG32(ERROR_ENABLE, 0x2c) 85 FIELD(ERROR_ENABLE, CMDBUSY, 0, 1) 86 FIELD(ERROR_ENABLE, OVERFLOW, 1, 1) 87 FIELD(ERROR_ENABLE, UNDERFLOW, 2, 1) 88 FIELD(ERROR_ENABLE, CMDINVAL, 3, 1) 89 FIELD(ERROR_ENABLE, CSIDINVAL, 4, 1) 90 REG32(ERROR_STATUS, 0x30) 91 FIELD(ERROR_STATUS, CMDBUSY, 0, 1) 92 FIELD(ERROR_STATUS, OVERFLOW, 1, 1) 93 FIELD(ERROR_STATUS, UNDERFLOW, 2, 1) 94 FIELD(ERROR_STATUS, CMDINVAL, 3, 1) 95 FIELD(ERROR_STATUS, CSIDINVAL, 4, 1) 96 FIELD(ERROR_STATUS, ACCESSINVAL, 5, 1) 97 REG32(EVENT_ENABLE, 0x34) 98 FIELD(EVENT_ENABLE, RXFULL, 0, 1) 99 FIELD(EVENT_ENABLE, TXEMPTY, 1, 1) 100 FIELD(EVENT_ENABLE, RXWM, 2, 1) 101 FIELD(EVENT_ENABLE, TXWM, 3, 1) 102 FIELD(EVENT_ENABLE, READY, 4, 1) 103 FIELD(EVENT_ENABLE, IDLE, 5, 1) 104 105 static inline uint8_t div4_round_up(uint8_t dividend) 106 { 107 return (dividend + 3) / 4; 108 } 109 110 static void ibex_spi_rxfifo_reset(IbexSPIHostState *s) 111 { 112 uint32_t data = s->regs[IBEX_SPI_HOST_STATUS]; 113 /* Empty the RX FIFO and assert RXEMPTY */ 114 fifo8_reset(&s->rx_fifo); 115 data = FIELD_DP32(data, STATUS, RXFULL, 0); 116 data = FIELD_DP32(data, STATUS, RXEMPTY, 1); 117 s->regs[IBEX_SPI_HOST_STATUS] = data; 118 } 119 120 static void ibex_spi_txfifo_reset(IbexSPIHostState *s) 121 { 122 uint32_t data = s->regs[IBEX_SPI_HOST_STATUS]; 123 /* Empty the TX FIFO and assert TXEMPTY */ 124 fifo8_reset(&s->tx_fifo); 125 data = FIELD_DP32(data, STATUS, TXFULL, 0); 126 data = FIELD_DP32(data, STATUS, TXEMPTY, 1); 127 s->regs[IBEX_SPI_HOST_STATUS] = data; 128 } 129 130 static void ibex_spi_host_reset(DeviceState *dev) 131 { 132 IbexSPIHostState *s = IBEX_SPI_HOST(dev); 133 trace_ibex_spi_host_reset("Resetting Ibex SPI"); 134 135 /* SPI Host Register Reset */ 136 s->regs[IBEX_SPI_HOST_INTR_STATE] = 0x00; 137 s->regs[IBEX_SPI_HOST_INTR_ENABLE] = 0x00; 138 s->regs[IBEX_SPI_HOST_INTR_TEST] = 0x00; 139 s->regs[IBEX_SPI_HOST_ALERT_TEST] = 0x00; 140 s->regs[IBEX_SPI_HOST_CONTROL] = 0x7f; 141 s->regs[IBEX_SPI_HOST_STATUS] = 0x00; 142 s->regs[IBEX_SPI_HOST_CONFIGOPTS] = 0x00; 143 s->regs[IBEX_SPI_HOST_CSID] = 0x00; 144 s->regs[IBEX_SPI_HOST_COMMAND] = 0x00; 145 /* RX/TX Modelled by FIFO */ 146 s->regs[IBEX_SPI_HOST_RXDATA] = 0x00; 147 s->regs[IBEX_SPI_HOST_TXDATA] = 0x00; 148 149 s->regs[IBEX_SPI_HOST_ERROR_ENABLE] = 0x1F; 150 s->regs[IBEX_SPI_HOST_ERROR_STATUS] = 0x00; 151 s->regs[IBEX_SPI_HOST_EVENT_ENABLE] = 0x00; 152 153 ibex_spi_rxfifo_reset(s); 154 ibex_spi_txfifo_reset(s); 155 156 s->init_status = true; 157 return; 158 } 159 160 /* 161 * Check if we need to trigger an interrupt. 162 * The two interrupts lines (host_err and event) can 163 * be enabled separately in 'IBEX_SPI_HOST_INTR_ENABLE'. 164 * 165 * Interrupts are triggered based on the ones 166 * enabled in the `IBEX_SPI_HOST_EVENT_ENABLE` and `IBEX_SPI_HOST_ERROR_ENABLE`. 167 */ 168 static void ibex_spi_host_irq(IbexSPIHostState *s) 169 { 170 uint32_t intr_test_reg = s->regs[IBEX_SPI_HOST_INTR_TEST]; 171 uint32_t intr_en_reg = s->regs[IBEX_SPI_HOST_INTR_ENABLE]; 172 uint32_t intr_state_reg = s->regs[IBEX_SPI_HOST_INTR_STATE]; 173 174 uint32_t err_en_reg = s->regs[IBEX_SPI_HOST_ERROR_ENABLE]; 175 uint32_t event_en_reg = s->regs[IBEX_SPI_HOST_EVENT_ENABLE]; 176 uint32_t err_status_reg = s->regs[IBEX_SPI_HOST_ERROR_STATUS]; 177 uint32_t status_reg = s->regs[IBEX_SPI_HOST_STATUS]; 178 179 180 bool error_en = FIELD_EX32(intr_en_reg, INTR_ENABLE, ERROR); 181 bool event_en = FIELD_EX32(intr_en_reg, INTR_ENABLE, SPI_EVENT); 182 bool err_pending = FIELD_EX32(intr_state_reg, INTR_STATE, ERROR); 183 bool status_pending = FIELD_EX32(intr_state_reg, INTR_STATE, SPI_EVENT); 184 185 int err_irq = 0, event_irq = 0; 186 187 /* Error IRQ enabled and Error IRQ Cleared */ 188 if (error_en && !err_pending) { 189 /* Event enabled, Interrupt Test Error */ 190 if (FIELD_EX32(intr_test_reg, INTR_TEST, ERROR)) { 191 err_irq = 1; 192 } else if (FIELD_EX32(err_en_reg, ERROR_ENABLE, CMDBUSY) && 193 FIELD_EX32(err_status_reg, ERROR_STATUS, CMDBUSY)) { 194 /* Wrote to COMMAND when not READY */ 195 err_irq = 1; 196 } else if (FIELD_EX32(err_en_reg, ERROR_ENABLE, CMDINVAL) && 197 FIELD_EX32(err_status_reg, ERROR_STATUS, CMDINVAL)) { 198 /* Invalid command segment */ 199 err_irq = 1; 200 } else if (FIELD_EX32(err_en_reg, ERROR_ENABLE, CSIDINVAL) && 201 FIELD_EX32(err_status_reg, ERROR_STATUS, CSIDINVAL)) { 202 /* Invalid value for CSID */ 203 err_irq = 1; 204 } 205 if (err_irq) { 206 s->regs[IBEX_SPI_HOST_INTR_STATE] |= R_INTR_STATE_ERROR_MASK; 207 } 208 } 209 210 qemu_set_irq(s->host_err, err_irq); 211 212 /* Event IRQ Enabled and Event IRQ Cleared */ 213 if (event_en && !status_pending) { 214 if (FIELD_EX32(intr_test_reg, INTR_STATE, SPI_EVENT)) { 215 /* Event enabled, Interrupt Test Event */ 216 event_irq = 1; 217 } else if (FIELD_EX32(event_en_reg, EVENT_ENABLE, READY) && 218 FIELD_EX32(status_reg, STATUS, READY)) { 219 /* SPI Host ready for next command */ 220 event_irq = 1; 221 } else if (FIELD_EX32(event_en_reg, EVENT_ENABLE, TXEMPTY) && 222 FIELD_EX32(status_reg, STATUS, TXEMPTY)) { 223 /* SPI TXEMPTY, TXFIFO drained */ 224 event_irq = 1; 225 } else if (FIELD_EX32(event_en_reg, EVENT_ENABLE, RXFULL) && 226 FIELD_EX32(status_reg, STATUS, RXFULL)) { 227 /* SPI RXFULL, RXFIFO full */ 228 event_irq = 1; 229 } 230 if (event_irq) { 231 s->regs[IBEX_SPI_HOST_INTR_STATE] |= R_INTR_STATE_SPI_EVENT_MASK; 232 } 233 } 234 235 qemu_set_irq(s->event, event_irq); 236 } 237 238 static void ibex_spi_host_transfer(IbexSPIHostState *s) 239 { 240 uint32_t rx, tx, data; 241 /* Get num of one byte transfers */ 242 uint8_t segment_len = FIELD_EX32(s->regs[IBEX_SPI_HOST_COMMAND], 243 COMMAND, LEN); 244 245 while (segment_len > 0) { 246 if (fifo8_is_empty(&s->tx_fifo)) { 247 /* Assert Stall */ 248 s->regs[IBEX_SPI_HOST_STATUS] |= R_STATUS_TXSTALL_MASK; 249 break; 250 } else if (fifo8_is_full(&s->rx_fifo)) { 251 /* Assert Stall */ 252 s->regs[IBEX_SPI_HOST_STATUS] |= R_STATUS_RXSTALL_MASK; 253 break; 254 } else { 255 tx = fifo8_pop(&s->tx_fifo); 256 } 257 258 rx = ssi_transfer(s->ssi, tx); 259 260 trace_ibex_spi_host_transfer(tx, rx); 261 262 if (!fifo8_is_full(&s->rx_fifo)) { 263 fifo8_push(&s->rx_fifo, rx); 264 } else { 265 /* Assert RXFULL */ 266 s->regs[IBEX_SPI_HOST_STATUS] |= R_STATUS_RXFULL_MASK; 267 } 268 --segment_len; 269 } 270 271 data = s->regs[IBEX_SPI_HOST_STATUS]; 272 /* Assert Ready */ 273 data = FIELD_DP32(data, STATUS, READY, 1); 274 /* Set RXQD */ 275 data = FIELD_DP32(data, STATUS, RXQD, div4_round_up(segment_len)); 276 /* Set TXQD */ 277 data = FIELD_DP32(data, STATUS, TXQD, fifo8_num_used(&s->tx_fifo) / 4); 278 /* Clear TXFULL */ 279 data = FIELD_DP32(data, STATUS, TXFULL, 0); 280 /* Reset RXEMPTY */ 281 data = FIELD_DP32(data, STATUS, RXEMPTY, 0); 282 /* Update register status */ 283 s->regs[IBEX_SPI_HOST_STATUS] = data; 284 /* Drop remaining bytes that exceed segment_len */ 285 ibex_spi_txfifo_reset(s); 286 287 ibex_spi_host_irq(s); 288 } 289 290 static uint64_t ibex_spi_host_read(void *opaque, hwaddr addr, 291 unsigned int size) 292 { 293 IbexSPIHostState *s = opaque; 294 uint32_t rc = 0; 295 uint8_t rx_byte = 0; 296 297 trace_ibex_spi_host_read(addr, size); 298 299 /* Match reg index */ 300 addr = addr >> 2; 301 switch (addr) { 302 /* Skipping any W/O registers */ 303 case IBEX_SPI_HOST_INTR_STATE...IBEX_SPI_HOST_INTR_ENABLE: 304 case IBEX_SPI_HOST_CONTROL...IBEX_SPI_HOST_STATUS: 305 rc = s->regs[addr]; 306 break; 307 case IBEX_SPI_HOST_CSID: 308 rc = s->regs[addr]; 309 break; 310 case IBEX_SPI_HOST_CONFIGOPTS: 311 rc = s->config_opts[s->regs[IBEX_SPI_HOST_CSID]]; 312 break; 313 case IBEX_SPI_HOST_TXDATA: 314 rc = s->regs[addr]; 315 break; 316 case IBEX_SPI_HOST_RXDATA: 317 /* Clear RXFULL */ 318 s->regs[IBEX_SPI_HOST_STATUS] &= ~R_STATUS_RXFULL_MASK; 319 320 for (int i = 0; i < 4; ++i) { 321 if (fifo8_is_empty(&s->rx_fifo)) { 322 /* Assert RXEMPTY, no IRQ */ 323 s->regs[IBEX_SPI_HOST_STATUS] |= R_STATUS_RXEMPTY_MASK; 324 s->regs[IBEX_SPI_HOST_ERROR_STATUS] |= 325 R_ERROR_STATUS_UNDERFLOW_MASK; 326 return rc; 327 } 328 rx_byte = fifo8_pop(&s->rx_fifo); 329 rc |= rx_byte << (i * 8); 330 } 331 break; 332 case IBEX_SPI_HOST_ERROR_ENABLE...IBEX_SPI_HOST_EVENT_ENABLE: 333 rc = s->regs[addr]; 334 break; 335 default: 336 qemu_log_mask(LOG_GUEST_ERROR, "Bad offset 0x%" HWADDR_PRIx "\n", 337 addr << 2); 338 } 339 return rc; 340 } 341 342 343 static void ibex_spi_host_write(void *opaque, hwaddr addr, 344 uint64_t val64, unsigned int size) 345 { 346 IbexSPIHostState *s = opaque; 347 uint32_t val32 = val64; 348 uint32_t shift_mask = 0xff, status = 0, data = 0; 349 uint8_t txqd_len; 350 351 trace_ibex_spi_host_write(addr, size, val64); 352 353 /* Match reg index */ 354 addr = addr >> 2; 355 356 switch (addr) { 357 /* Skipping any R/O registers */ 358 case IBEX_SPI_HOST_INTR_STATE: 359 /* rw1c status register */ 360 if (FIELD_EX32(val32, INTR_STATE, ERROR)) { 361 data = FIELD_DP32(data, INTR_STATE, ERROR, 0); 362 } 363 if (FIELD_EX32(val32, INTR_STATE, SPI_EVENT)) { 364 data = FIELD_DP32(data, INTR_STATE, SPI_EVENT, 0); 365 } 366 s->regs[addr] = data; 367 break; 368 case IBEX_SPI_HOST_INTR_ENABLE: 369 s->regs[addr] = val32; 370 break; 371 case IBEX_SPI_HOST_INTR_TEST: 372 s->regs[addr] = val32; 373 ibex_spi_host_irq(s); 374 break; 375 case IBEX_SPI_HOST_ALERT_TEST: 376 s->regs[addr] = val32; 377 qemu_log_mask(LOG_UNIMP, 378 "%s: SPI_ALERT_TEST is not supported\n", __func__); 379 break; 380 case IBEX_SPI_HOST_CONTROL: 381 s->regs[addr] = val32; 382 383 if (val32 & R_CONTROL_SW_RST_MASK) { 384 ibex_spi_host_reset((DeviceState *)s); 385 /* Clear active if any */ 386 s->regs[IBEX_SPI_HOST_STATUS] &= ~R_STATUS_ACTIVE_MASK; 387 } 388 389 if (val32 & R_CONTROL_OUTPUT_EN_MASK) { 390 qemu_log_mask(LOG_UNIMP, 391 "%s: CONTROL_OUTPUT_EN is not supported\n", __func__); 392 } 393 break; 394 case IBEX_SPI_HOST_CONFIGOPTS: 395 /* Update the respective config-opts register based on CSIDth index */ 396 s->config_opts[s->regs[IBEX_SPI_HOST_CSID]] = val32; 397 qemu_log_mask(LOG_UNIMP, 398 "%s: CONFIGOPTS Hardware settings not supported\n", 399 __func__); 400 break; 401 case IBEX_SPI_HOST_CSID: 402 if (val32 >= s->num_cs) { 403 /* CSID exceeds max num_cs */ 404 s->regs[IBEX_SPI_HOST_ERROR_STATUS] |= 405 R_ERROR_STATUS_CSIDINVAL_MASK; 406 ibex_spi_host_irq(s); 407 return; 408 } 409 s->regs[addr] = val32; 410 break; 411 case IBEX_SPI_HOST_COMMAND: 412 s->regs[addr] = val32; 413 414 /* STALL, IP not enabled */ 415 if (!(FIELD_EX32(s->regs[IBEX_SPI_HOST_CONTROL], 416 CONTROL, SPIEN))) { 417 return; 418 } 419 420 /* SPI not ready, IRQ Error */ 421 if (!(FIELD_EX32(s->regs[IBEX_SPI_HOST_STATUS], 422 STATUS, READY))) { 423 s->regs[IBEX_SPI_HOST_ERROR_STATUS] |= R_ERROR_STATUS_CMDBUSY_MASK; 424 ibex_spi_host_irq(s); 425 return; 426 } 427 428 /* Assert Not Ready */ 429 s->regs[IBEX_SPI_HOST_STATUS] &= ~R_STATUS_READY_MASK; 430 431 if (FIELD_EX32(val32, COMMAND, DIRECTION) != BIDIRECTIONAL_TRANSFER) { 432 qemu_log_mask(LOG_UNIMP, 433 "%s: Rx Only/Tx Only are not supported\n", __func__); 434 } 435 436 if (val32 & R_COMMAND_CSAAT_MASK) { 437 qemu_log_mask(LOG_UNIMP, 438 "%s: CSAAT is not supported\n", __func__); 439 } 440 if (val32 & R_COMMAND_SPEED_MASK) { 441 qemu_log_mask(LOG_UNIMP, 442 "%s: SPEED is not supported\n", __func__); 443 } 444 445 /* Set Transfer Callback */ 446 timer_mod(s->fifo_trigger_handle, 447 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + 448 (TX_INTERRUPT_TRIGGER_DELAY_NS)); 449 450 break; 451 case IBEX_SPI_HOST_TXDATA: 452 /* 453 * This is a hardware `feature` where 454 * the first word written to TXDATA after init is omitted entirely 455 */ 456 if (s->init_status) { 457 s->init_status = false; 458 return; 459 } 460 461 for (int i = 0; i < 4; ++i) { 462 /* Attempting to write when TXFULL */ 463 if (fifo8_is_full(&s->tx_fifo)) { 464 /* Assert RXEMPTY, no IRQ */ 465 s->regs[IBEX_SPI_HOST_STATUS] |= R_STATUS_TXFULL_MASK; 466 s->regs[IBEX_SPI_HOST_ERROR_STATUS] |= 467 R_ERROR_STATUS_OVERFLOW_MASK; 468 ibex_spi_host_irq(s); 469 return; 470 } 471 /* Byte ordering is set by the IP */ 472 status = s->regs[IBEX_SPI_HOST_STATUS]; 473 if (FIELD_EX32(status, STATUS, BYTEORDER) == 0) { 474 /* LE: LSB transmitted first (default for ibex processor) */ 475 shift_mask = 0xff << (i * 8); 476 } else { 477 /* BE: MSB transmitted first */ 478 qemu_log_mask(LOG_UNIMP, 479 "%s: Big endian is not supported\n", __func__); 480 } 481 482 fifo8_push(&s->tx_fifo, (val32 & shift_mask) >> (i * 8)); 483 } 484 status = s->regs[IBEX_SPI_HOST_STATUS]; 485 /* Reset TXEMPTY */ 486 status = FIELD_DP32(status, STATUS, TXEMPTY, 0); 487 /* Update TXQD */ 488 txqd_len = FIELD_EX32(status, STATUS, TXQD); 489 /* Partial bytes (size < 4) are padded, in words. */ 490 txqd_len += 1; 491 status = FIELD_DP32(status, STATUS, TXQD, txqd_len); 492 /* Assert Ready */ 493 status = FIELD_DP32(status, STATUS, READY, 1); 494 /* Update register status */ 495 s->regs[IBEX_SPI_HOST_STATUS] = status; 496 break; 497 case IBEX_SPI_HOST_ERROR_ENABLE: 498 s->regs[addr] = val32; 499 500 if (val32 & R_ERROR_ENABLE_CMDINVAL_MASK) { 501 qemu_log_mask(LOG_UNIMP, 502 "%s: Segment Length is not supported\n", __func__); 503 } 504 break; 505 case IBEX_SPI_HOST_ERROR_STATUS: 506 /* 507 * Indicates any errors that have occurred. 508 * When an error occurs, the corresponding bit must be cleared 509 * here before issuing any further commands 510 */ 511 status = s->regs[addr]; 512 /* rw1c status register */ 513 if (FIELD_EX32(val32, ERROR_STATUS, CMDBUSY)) { 514 status = FIELD_DP32(status, ERROR_STATUS, CMDBUSY, 0); 515 } 516 if (FIELD_EX32(val32, ERROR_STATUS, OVERFLOW)) { 517 status = FIELD_DP32(status, ERROR_STATUS, OVERFLOW, 0); 518 } 519 if (FIELD_EX32(val32, ERROR_STATUS, UNDERFLOW)) { 520 status = FIELD_DP32(status, ERROR_STATUS, UNDERFLOW, 0); 521 } 522 if (FIELD_EX32(val32, ERROR_STATUS, CMDINVAL)) { 523 status = FIELD_DP32(status, ERROR_STATUS, CMDINVAL, 0); 524 } 525 if (FIELD_EX32(val32, ERROR_STATUS, CSIDINVAL)) { 526 status = FIELD_DP32(status, ERROR_STATUS, CSIDINVAL, 0); 527 } 528 if (FIELD_EX32(val32, ERROR_STATUS, ACCESSINVAL)) { 529 status = FIELD_DP32(status, ERROR_STATUS, ACCESSINVAL, 0); 530 } 531 s->regs[addr] = status; 532 break; 533 case IBEX_SPI_HOST_EVENT_ENABLE: 534 /* Controls which classes of SPI events raise an interrupt. */ 535 s->regs[addr] = val32; 536 537 if (val32 & R_EVENT_ENABLE_RXWM_MASK) { 538 qemu_log_mask(LOG_UNIMP, 539 "%s: RXWM is not supported\n", __func__); 540 } 541 if (val32 & R_EVENT_ENABLE_TXWM_MASK) { 542 qemu_log_mask(LOG_UNIMP, 543 "%s: TXWM is not supported\n", __func__); 544 } 545 546 if (val32 & R_EVENT_ENABLE_IDLE_MASK) { 547 qemu_log_mask(LOG_UNIMP, 548 "%s: IDLE is not supported\n", __func__); 549 } 550 break; 551 default: 552 qemu_log_mask(LOG_GUEST_ERROR, "Bad offset 0x%" HWADDR_PRIx "\n", 553 addr << 2); 554 } 555 } 556 557 static const MemoryRegionOps ibex_spi_ops = { 558 .read = ibex_spi_host_read, 559 .write = ibex_spi_host_write, 560 /* Ibex default LE */ 561 .endianness = DEVICE_LITTLE_ENDIAN, 562 }; 563 564 static Property ibex_spi_properties[] = { 565 DEFINE_PROP_UINT32("num_cs", IbexSPIHostState, num_cs, 1), 566 DEFINE_PROP_END_OF_LIST(), 567 }; 568 569 static const VMStateDescription vmstate_ibex = { 570 .name = TYPE_IBEX_SPI_HOST, 571 .version_id = 1, 572 .minimum_version_id = 1, 573 .fields = (const VMStateField[]) { 574 VMSTATE_UINT32_ARRAY(regs, IbexSPIHostState, IBEX_SPI_HOST_MAX_REGS), 575 VMSTATE_VARRAY_UINT32(config_opts, IbexSPIHostState, 576 num_cs, 0, vmstate_info_uint32, uint32_t), 577 VMSTATE_FIFO8(rx_fifo, IbexSPIHostState), 578 VMSTATE_FIFO8(tx_fifo, IbexSPIHostState), 579 VMSTATE_TIMER_PTR(fifo_trigger_handle, IbexSPIHostState), 580 VMSTATE_BOOL(init_status, IbexSPIHostState), 581 VMSTATE_END_OF_LIST() 582 } 583 }; 584 585 static void fifo_trigger_update(void *opaque) 586 { 587 IbexSPIHostState *s = opaque; 588 ibex_spi_host_transfer(s); 589 } 590 591 static void ibex_spi_host_realize(DeviceState *dev, Error **errp) 592 { 593 IbexSPIHostState *s = IBEX_SPI_HOST(dev); 594 int i; 595 596 s->ssi = ssi_create_bus(dev, "ssi"); 597 s->cs_lines = g_new0(qemu_irq, s->num_cs); 598 599 for (i = 0; i < s->num_cs; ++i) { 600 sysbus_init_irq(SYS_BUS_DEVICE(dev), &s->cs_lines[i]); 601 } 602 603 /* Setup CONFIGOPTS Multi-register */ 604 s->config_opts = g_new0(uint32_t, s->num_cs); 605 606 /* Setup FIFO Interrupt Timer */ 607 s->fifo_trigger_handle = timer_new_ns(QEMU_CLOCK_VIRTUAL, 608 fifo_trigger_update, s); 609 610 /* FIFO sizes as per OT Spec */ 611 fifo8_create(&s->tx_fifo, IBEX_SPI_HOST_TXFIFO_LEN); 612 fifo8_create(&s->rx_fifo, IBEX_SPI_HOST_RXFIFO_LEN); 613 } 614 615 static void ibex_spi_host_init(Object *obj) 616 { 617 IbexSPIHostState *s = IBEX_SPI_HOST(obj); 618 619 sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->host_err); 620 sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->event); 621 622 memory_region_init_io(&s->mmio, obj, &ibex_spi_ops, s, 623 TYPE_IBEX_SPI_HOST, 0x1000); 624 sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio); 625 } 626 627 static void ibex_spi_host_class_init(ObjectClass *klass, void *data) 628 { 629 DeviceClass *dc = DEVICE_CLASS(klass); 630 dc->realize = ibex_spi_host_realize; 631 device_class_set_legacy_reset(dc, ibex_spi_host_reset); 632 dc->vmsd = &vmstate_ibex; 633 device_class_set_props(dc, ibex_spi_properties); 634 } 635 636 static const TypeInfo ibex_spi_host_info = { 637 .name = TYPE_IBEX_SPI_HOST, 638 .parent = TYPE_SYS_BUS_DEVICE, 639 .instance_size = sizeof(IbexSPIHostState), 640 .instance_init = ibex_spi_host_init, 641 .class_init = ibex_spi_host_class_init, 642 }; 643 644 static void ibex_spi_host_register_types(void) 645 { 646 type_register_static(&ibex_spi_host_info); 647 } 648 649 type_init(ibex_spi_host_register_types) 650