Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/arm/broadcom/bcm2835/bcm2835_spi.c
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@freebsd.org> 5 * Copyright (c) 2013 Luiz Otavio O Souza <loos@freebsd.org> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 */ 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/bus.h> 36 37 #include <sys/kernel.h> 38 #include <sys/module.h> 39 #include <sys/rman.h> 40 #include <sys/lock.h> 41 #include <sys/mutex.h> 42 #include <sys/sysctl.h> 43 44 #include <machine/bus.h> 45 #include <machine/resource.h> 46 #include <machine/intr.h> 47 48 #include <dev/ofw/ofw_bus.h> 49 #include <dev/ofw/ofw_bus_subr.h> 50 51 #include <dev/spibus/spi.h> 52 #include <dev/spibus/spibusvar.h> 53 54 #include <arm/broadcom/bcm2835/bcm2835_spireg.h> 55 #include <arm/broadcom/bcm2835/bcm2835_spivar.h> 56 57 #include "spibus_if.h" 58 59 static struct ofw_compat_data compat_data[] = { 60 {"broadcom,bcm2835-spi", 1}, 61 {"brcm,bcm2835-spi", 1}, 62 {NULL, 0} 63 }; 64 65 static void bcm_spi_intr(void *); 66 67 #ifdef BCM_SPI_DEBUG 68 static void 69 bcm_spi_printr(device_t dev) 70 { 71 struct bcm_spi_softc *sc; 72 uint32_t reg; 73 74 sc = device_get_softc(dev); 75 reg = BCM_SPI_READ(sc, SPI_CS); 76 device_printf(dev, "CS=%b\n", reg, 77 "\2\1CS0\2CS1\3CPHA\4CPOL\7CSPOL" 78 "\10TA\11DMAEN\12INTD\13INTR\14ADCS\15REN\16LEN" 79 "\21DONE\22RXD\23TXD\24RXR\25RXF\26CSPOL0\27CSPOL1" 80 "\30CSPOL2\31DMA_LEN\32LEN_LONG"); 81 reg = BCM_SPI_READ(sc, SPI_CLK) & SPI_CLK_MASK; 82 if (reg % 2) 83 reg--; 84 if (reg == 0) 85 reg = 65536; 86 device_printf(dev, "CLK=%uMhz/%d=%luhz\n", 87 SPI_CORE_CLK / 1000000, reg, SPI_CORE_CLK / reg); 88 reg = BCM_SPI_READ(sc, SPI_DLEN) & SPI_DLEN_MASK; 89 device_printf(dev, "DLEN=%d\n", reg); 90 reg = BCM_SPI_READ(sc, SPI_LTOH) & SPI_LTOH_MASK; 91 device_printf(dev, "LTOH=%d\n", reg); 92 reg = BCM_SPI_READ(sc, SPI_DC); 93 device_printf(dev, "DC=RPANIC=%#x RDREQ=%#x TPANIC=%#x TDREQ=%#x\n", 94 (reg & SPI_DC_RPANIC_MASK) >> SPI_DC_RPANIC_SHIFT, 95 (reg & SPI_DC_RDREQ_MASK) >> SPI_DC_RDREQ_SHIFT, 96 (reg & SPI_DC_TPANIC_MASK) >> SPI_DC_TPANIC_SHIFT, 97 (reg & SPI_DC_TDREQ_MASK) >> SPI_DC_TDREQ_SHIFT); 98 } 99 #endif 100 101 static void 102 bcm_spi_modifyreg(struct bcm_spi_softc *sc, uint32_t off, uint32_t mask, 103 uint32_t value) 104 { 105 uint32_t reg; 106 107 mtx_assert(&sc->sc_mtx, MA_OWNED); 108 reg = BCM_SPI_READ(sc, off); 109 reg &= ~mask; 110 reg |= value; 111 BCM_SPI_WRITE(sc, off, reg); 112 } 113 114 static int 115 bcm_spi_clock_proc(SYSCTL_HANDLER_ARGS) 116 { 117 struct bcm_spi_softc *sc; 118 uint32_t clk; 119 int error; 120 121 sc = (struct bcm_spi_softc *)arg1; 122 123 BCM_SPI_LOCK(sc); 124 clk = BCM_SPI_READ(sc, SPI_CLK); 125 BCM_SPI_UNLOCK(sc); 126 clk &= 0xffff; 127 if (clk == 0) 128 clk = 65536; 129 clk = SPI_CORE_CLK / clk; 130 131 error = sysctl_handle_int(oidp, &clk, sizeof(clk), req); 132 if (error != 0 || req->newptr == NULL) 133 return (error); 134 135 return (0); 136 } 137 138 static int 139 bcm_spi_cs_bit_proc(SYSCTL_HANDLER_ARGS, uint32_t bit) 140 { 141 struct bcm_spi_softc *sc; 142 uint32_t reg; 143 int error; 144 145 sc = (struct bcm_spi_softc *)arg1; 146 BCM_SPI_LOCK(sc); 147 reg = BCM_SPI_READ(sc, SPI_CS); 148 BCM_SPI_UNLOCK(sc); 149 reg = (reg & bit) ? 1 : 0; 150 151 error = sysctl_handle_int(oidp, ®, sizeof(reg), req); 152 if (error != 0 || req->newptr == NULL) 153 return (error); 154 155 return (0); 156 } 157 158 static int 159 bcm_spi_cpol_proc(SYSCTL_HANDLER_ARGS) 160 { 161 162 return (bcm_spi_cs_bit_proc(oidp, arg1, arg2, req, SPI_CS_CPOL)); 163 } 164 165 static int 166 bcm_spi_cpha_proc(SYSCTL_HANDLER_ARGS) 167 { 168 169 return (bcm_spi_cs_bit_proc(oidp, arg1, arg2, req, SPI_CS_CPHA)); 170 } 171 172 static int 173 bcm_spi_cspol0_proc(SYSCTL_HANDLER_ARGS) 174 { 175 176 return (bcm_spi_cs_bit_proc(oidp, arg1, arg2, req, SPI_CS_CSPOL0)); 177 } 178 179 static int 180 bcm_spi_cspol1_proc(SYSCTL_HANDLER_ARGS) 181 { 182 183 return (bcm_spi_cs_bit_proc(oidp, arg1, arg2, req, SPI_CS_CSPOL1)); 184 } 185 186 static int 187 bcm_spi_cspol2_proc(SYSCTL_HANDLER_ARGS) 188 { 189 190 return (bcm_spi_cs_bit_proc(oidp, arg1, arg2, req, SPI_CS_CSPOL2)); 191 } 192 193 static void 194 bcm_spi_sysctl_init(struct bcm_spi_softc *sc) 195 { 196 struct sysctl_ctx_list *ctx; 197 struct sysctl_oid *tree_node; 198 struct sysctl_oid_list *tree; 199 200 /* 201 * Add system sysctl tree/handlers. 202 */ 203 ctx = device_get_sysctl_ctx(sc->sc_dev); 204 tree_node = device_get_sysctl_tree(sc->sc_dev); 205 tree = SYSCTL_CHILDREN(tree_node); 206 SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "clock", 207 CTLFLAG_RD | CTLTYPE_UINT | CTLFLAG_NEEDGIANT, sc, sizeof(*sc), 208 bcm_spi_clock_proc, "IU", "SPI BUS clock frequency"); 209 SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "cpol", 210 CTLFLAG_RD | CTLTYPE_UINT | CTLFLAG_NEEDGIANT, sc, sizeof(*sc), 211 bcm_spi_cpol_proc, "IU", "SPI BUS clock polarity"); 212 SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "cpha", 213 CTLFLAG_RD | CTLTYPE_UINT | CTLFLAG_NEEDGIANT, sc, sizeof(*sc), 214 bcm_spi_cpha_proc, "IU", "SPI BUS clock phase"); 215 SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "cspol0", 216 CTLFLAG_RD | CTLTYPE_UINT | CTLFLAG_NEEDGIANT, sc, sizeof(*sc), 217 bcm_spi_cspol0_proc, "IU", "SPI BUS chip select 0 polarity"); 218 SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "cspol1", 219 CTLFLAG_RD | CTLTYPE_UINT | CTLFLAG_NEEDGIANT, sc, sizeof(*sc), 220 bcm_spi_cspol1_proc, "IU", "SPI BUS chip select 1 polarity"); 221 SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "cspol2", 222 CTLFLAG_RD | CTLTYPE_UINT | CTLFLAG_NEEDGIANT, sc, sizeof(*sc), 223 bcm_spi_cspol2_proc, "IU", "SPI BUS chip select 2 polarity"); 224 } 225 226 static int 227 bcm_spi_probe(device_t dev) 228 { 229 230 if (!ofw_bus_status_okay(dev)) 231 return (ENXIO); 232 233 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 234 return (ENXIO); 235 236 device_set_desc(dev, "BCM2708/2835 SPI controller"); 237 238 return (BUS_PROBE_DEFAULT); 239 } 240 241 static int 242 bcm_spi_attach(device_t dev) 243 { 244 struct bcm_spi_softc *sc; 245 int rid; 246 247 if (device_get_unit(dev) != 0) { 248 device_printf(dev, "only one SPI controller supported\n"); 249 return (ENXIO); 250 } 251 252 sc = device_get_softc(dev); 253 sc->sc_dev = dev; 254 255 rid = 0; 256 sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 257 RF_ACTIVE); 258 if (!sc->sc_mem_res) { 259 device_printf(dev, "cannot allocate memory window\n"); 260 return (ENXIO); 261 } 262 263 sc->sc_bst = rman_get_bustag(sc->sc_mem_res); 264 sc->sc_bsh = rman_get_bushandle(sc->sc_mem_res); 265 266 rid = 0; 267 sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, 268 RF_ACTIVE); 269 if (!sc->sc_irq_res) { 270 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res); 271 device_printf(dev, "cannot allocate interrupt\n"); 272 return (ENXIO); 273 } 274 275 /* Hook up our interrupt handler. */ 276 if (bus_setup_intr(dev, sc->sc_irq_res, INTR_TYPE_MISC | INTR_MPSAFE, 277 NULL, bcm_spi_intr, sc, &sc->sc_intrhand)) { 278 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_irq_res); 279 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res); 280 device_printf(dev, "cannot setup the interrupt handler\n"); 281 return (ENXIO); 282 } 283 284 mtx_init(&sc->sc_mtx, "bcm_spi", NULL, MTX_DEF); 285 286 /* Add sysctl nodes. */ 287 bcm_spi_sysctl_init(sc); 288 289 #ifdef BCM_SPI_DEBUG 290 bcm_spi_printr(dev); 291 #endif 292 293 /* 294 * Enable the SPI controller. Clear the rx and tx FIFO. 295 * Defaults to SPI mode 0. 296 */ 297 BCM_SPI_WRITE(sc, SPI_CS, SPI_CS_CLEAR_RXFIFO | SPI_CS_CLEAR_TXFIFO); 298 299 #ifdef BCM_SPI_DEBUG 300 bcm_spi_printr(dev); 301 #endif 302 303 device_add_child(dev, "spibus", -1); 304 305 return (bus_generic_attach(dev)); 306 } 307 308 static int 309 bcm_spi_detach(device_t dev) 310 { 311 struct bcm_spi_softc *sc; 312 313 bus_generic_detach(dev); 314 315 sc = device_get_softc(dev); 316 mtx_destroy(&sc->sc_mtx); 317 if (sc->sc_intrhand) 318 bus_teardown_intr(dev, sc->sc_irq_res, sc->sc_intrhand); 319 if (sc->sc_irq_res) 320 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_irq_res); 321 if (sc->sc_mem_res) 322 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res); 323 324 return (0); 325 } 326 327 static void 328 bcm_spi_fill_fifo(struct bcm_spi_softc *sc) 329 { 330 struct spi_command *cmd; 331 uint32_t cs, written; 332 uint8_t *data; 333 334 cmd = sc->sc_cmd; 335 cs = BCM_SPI_READ(sc, SPI_CS) & (SPI_CS_TA | SPI_CS_TXD); 336 while (sc->sc_written < sc->sc_len && 337 cs == (SPI_CS_TA | SPI_CS_TXD)) { 338 data = (uint8_t *)cmd->tx_cmd; 339 written = sc->sc_written++; 340 if (written >= cmd->tx_cmd_sz) { 341 data = (uint8_t *)cmd->tx_data; 342 written -= cmd->tx_cmd_sz; 343 } 344 BCM_SPI_WRITE(sc, SPI_FIFO, data[written]); 345 cs = BCM_SPI_READ(sc, SPI_CS) & (SPI_CS_TA | SPI_CS_TXD); 346 } 347 } 348 349 static void 350 bcm_spi_drain_fifo(struct bcm_spi_softc *sc) 351 { 352 struct spi_command *cmd; 353 uint32_t cs, read; 354 uint8_t *data; 355 356 cmd = sc->sc_cmd; 357 cs = BCM_SPI_READ(sc, SPI_CS) & SPI_CS_RXD; 358 while (sc->sc_read < sc->sc_len && cs == SPI_CS_RXD) { 359 data = (uint8_t *)cmd->rx_cmd; 360 read = sc->sc_read++; 361 if (read >= cmd->rx_cmd_sz) { 362 data = (uint8_t *)cmd->rx_data; 363 read -= cmd->rx_cmd_sz; 364 } 365 data[read] = BCM_SPI_READ(sc, SPI_FIFO) & 0xff; 366 cs = BCM_SPI_READ(sc, SPI_CS) & SPI_CS_RXD; 367 } 368 } 369 370 static void 371 bcm_spi_intr(void *arg) 372 { 373 struct bcm_spi_softc *sc; 374 375 sc = (struct bcm_spi_softc *)arg; 376 BCM_SPI_LOCK(sc); 377 378 /* Filter stray interrupts. */ 379 if ((sc->sc_flags & BCM_SPI_BUSY) == 0) { 380 BCM_SPI_UNLOCK(sc); 381 return; 382 } 383 384 /* TX - Fill up the FIFO. */ 385 bcm_spi_fill_fifo(sc); 386 387 /* RX - Drain the FIFO. */ 388 bcm_spi_drain_fifo(sc); 389 390 /* Check for end of transfer. */ 391 if (sc->sc_written == sc->sc_len && sc->sc_read == sc->sc_len) { 392 /* Disable interrupts and the SPI engine. */ 393 bcm_spi_modifyreg(sc, SPI_CS, 394 SPI_CS_TA | SPI_CS_INTR | SPI_CS_INTD, 0); 395 wakeup(sc->sc_dev); 396 } 397 398 BCM_SPI_UNLOCK(sc); 399 } 400 401 static int 402 bcm_spi_transfer(device_t dev, device_t child, struct spi_command *cmd) 403 { 404 struct bcm_spi_softc *sc; 405 uint32_t cs, mode, clock; 406 int err; 407 408 sc = device_get_softc(dev); 409 410 KASSERT(cmd->tx_cmd_sz == cmd->rx_cmd_sz, 411 ("TX/RX command sizes should be equal")); 412 KASSERT(cmd->tx_data_sz == cmd->rx_data_sz, 413 ("TX/RX data sizes should be equal")); 414 415 /* Get the bus speed, mode, and chip select for this child. */ 416 417 spibus_get_cs(child, &cs); 418 if ((cs & (~SPIBUS_CS_HIGH)) > 2) { 419 device_printf(dev, 420 "Invalid chip select %u requested by %s\n", cs, 421 device_get_nameunit(child)); 422 return (EINVAL); 423 } 424 425 spibus_get_clock(child, &clock); 426 if (clock == 0) { 427 device_printf(dev, 428 "Invalid clock %uHz requested by %s\n", clock, 429 device_get_nameunit(child)); 430 return (EINVAL); 431 } 432 433 spibus_get_mode(child, &mode); 434 if (mode > 3) { 435 device_printf(dev, 436 "Invalid mode %u requested by %s\n", mode, 437 device_get_nameunit(child)); 438 return (EINVAL); 439 } 440 441 /* If the controller is in use wait until it is available. */ 442 BCM_SPI_LOCK(sc); 443 while (sc->sc_flags & BCM_SPI_BUSY) 444 mtx_sleep(dev, &sc->sc_mtx, 0, "bcm_spi", 0); 445 446 /* Now we have control over SPI controller. */ 447 sc->sc_flags = BCM_SPI_BUSY; 448 449 /* Clear the FIFO. */ 450 bcm_spi_modifyreg(sc, SPI_CS, 451 SPI_CS_CLEAR_RXFIFO | SPI_CS_CLEAR_TXFIFO, 452 SPI_CS_CLEAR_RXFIFO | SPI_CS_CLEAR_TXFIFO); 453 454 /* Save a pointer to the SPI command. */ 455 sc->sc_cmd = cmd; 456 sc->sc_read = 0; 457 sc->sc_written = 0; 458 sc->sc_len = cmd->tx_cmd_sz + cmd->tx_data_sz; 459 460 #ifdef BCM2835_SPI_USE_CS_HIGH /* TODO: for when behavior is correct */ 461 /* 462 * Assign CS polarity first, while the CS indicates 'inactive'. 463 * This will need to set the correct polarity bit based on the 'cs', and 464 * the polarity bit will remain in this state, even after the transaction 465 * is complete. 466 */ 467 if((cs & ~SPIBUS_CS_HIGH) == 0) { 468 bcm_spi_modifyreg(sc, SPI_CS, 469 SPI_CS_CSPOL0, 470 ((cs & (SPIBUS_CS_HIGH)) ? SPI_CS_CSPOL0 : 0)); 471 } 472 else if((cs & ~SPIBUS_CS_HIGH) == 1) { 473 bcm_spi_modifyreg(sc, SPI_CS, 474 SPI_CS_CSPOL1, 475 ((cs & (SPIBUS_CS_HIGH)) ? SPI_CS_CSPOL1 : 0)); 476 } 477 else if((cs & ~SPIBUS_CS_HIGH) == 2) { 478 bcm_spi_modifyreg(sc, SPI_CS, 479 SPI_CS_CSPOL2, 480 ((cs & (SPIBUS_CS_HIGH)) ? SPI_CS_CSPOL2 : 0)); 481 } 482 #endif 483 484 /* 485 * Set the mode in 'SPI_CS' (clock phase and polarity bits). 486 * This must happen before CS output pin is active. 487 * Otherwise, you might glitch and drop the first bit. 488 */ 489 bcm_spi_modifyreg(sc, SPI_CS, 490 SPI_CS_CPOL | SPI_CS_CPHA, 491 ((mode & SPIBUS_MODE_CPHA) ? SPI_CS_CPHA : 0) | 492 ((mode & SPIBUS_MODE_CPOL) ? SPI_CS_CPOL : 0)); 493 494 /* 495 * Set the clock divider in 'SPI_CLK - see 'bcm_spi_clock_proc()'. 496 */ 497 498 /* calculate 'clock' as a divider value from freq */ 499 clock = SPI_CORE_CLK / clock; 500 if (clock <= 1) 501 clock = 2; 502 else if (clock % 2) 503 clock--; 504 if (clock > 0xffff) 505 clock = 0; 506 507 BCM_SPI_WRITE(sc, SPI_CLK, clock); 508 509 /* 510 * Set the CS for this transaction, enable interrupts and announce 511 * we're ready to tx. This will kick off the first interrupt. 512 */ 513 bcm_spi_modifyreg(sc, SPI_CS, 514 SPI_CS_MASK | SPI_CS_TA | SPI_CS_INTR | SPI_CS_INTD, 515 (cs & (~SPIBUS_CS_HIGH)) | /* cs is the lower 2 bits of the reg */ 516 SPI_CS_TA | SPI_CS_INTR | SPI_CS_INTD); 517 518 /* Wait for the transaction to complete. */ 519 err = mtx_sleep(dev, &sc->sc_mtx, 0, "bcm_spi", hz * 2); 520 521 /* Make sure the SPI engine and interrupts are disabled. */ 522 bcm_spi_modifyreg(sc, SPI_CS, SPI_CS_TA | SPI_CS_INTR | SPI_CS_INTD, 0); 523 524 /* Release the controller and wakeup the next thread waiting for it. */ 525 sc->sc_flags = 0; 526 wakeup_one(dev); 527 BCM_SPI_UNLOCK(sc); 528 529 /* 530 * Check for transfer timeout. The SPI controller doesn't 531 * return errors. 532 */ 533 if (err == EWOULDBLOCK) { 534 device_printf(sc->sc_dev, "SPI error (timeout)\n"); 535 err = EIO; 536 } 537 538 return (err); 539 } 540 541 static phandle_t 542 bcm_spi_get_node(device_t bus, device_t dev) 543 { 544 545 /* We only have one child, the SPI bus, which needs our own node. */ 546 return (ofw_bus_get_node(bus)); 547 } 548 549 static device_method_t bcm_spi_methods[] = { 550 /* Device interface */ 551 DEVMETHOD(device_probe, bcm_spi_probe), 552 DEVMETHOD(device_attach, bcm_spi_attach), 553 DEVMETHOD(device_detach, bcm_spi_detach), 554 555 /* SPI interface */ 556 DEVMETHOD(spibus_transfer, bcm_spi_transfer), 557 558 /* ofw_bus interface */ 559 DEVMETHOD(ofw_bus_get_node, bcm_spi_get_node), 560 561 DEVMETHOD_END 562 }; 563 564 static driver_t bcm_spi_driver = { 565 "spi", 566 bcm_spi_methods, 567 sizeof(struct bcm_spi_softc), 568 }; 569 570 DRIVER_MODULE(bcm2835_spi, simplebus, bcm_spi_driver, 0, 0);
Cache object: 9e6b5e475195054e41faf570697fc105
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