Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/arm/mv/a37x0_spi.c
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1 /*- 2 * Copyright (c) 2018, 2019 Rubicon Communications, LLC (Netgate) 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 * 24 */ 25 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD$"); 28 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/bus.h> 32 #include <sys/kernel.h> 33 #include <sys/module.h> 34 #include <sys/mutex.h> 35 #include <sys/rman.h> 36 37 #include <machine/bus.h> 38 #include <machine/resource.h> 39 #include <machine/intr.h> 40 41 #include <dev/ofw/ofw_bus.h> 42 #include <dev/ofw/ofw_bus_subr.h> 43 #include <dev/spibus/spi.h> 44 #include <dev/spibus/spibusvar.h> 45 46 #include "spibus_if.h" 47 48 struct a37x0_spi_softc { 49 device_t sc_dev; 50 struct mtx sc_mtx; 51 struct resource *sc_mem_res; 52 struct resource *sc_irq_res; 53 struct spi_command *sc_cmd; 54 bus_space_tag_t sc_bst; 55 bus_space_handle_t sc_bsh; 56 uint32_t sc_len; 57 uint32_t sc_maxfreq; 58 uint32_t sc_read; 59 uint32_t sc_flags; 60 uint32_t sc_written; 61 void *sc_intrhand; 62 }; 63 64 #define A37X0_SPI_WRITE(_sc, _off, _val) \ 65 bus_space_write_4((_sc)->sc_bst, (_sc)->sc_bsh, (_off), (_val)) 66 #define A37X0_SPI_READ(_sc, _off) \ 67 bus_space_read_4((_sc)->sc_bst, (_sc)->sc_bsh, (_off)) 68 #define A37X0_SPI_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx) 69 #define A37X0_SPI_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx) 70 71 #define A37X0_SPI_BUSY (1 << 0) 72 /* 73 * While the A3700 utils from Marvell usually sets the QSF clock to 200MHz, 74 * there is no guarantee that it is correct without the proper clock framework 75 * to retrieve the actual TBG and PLL settings. 76 */ 77 #define A37X0_SPI_CLOCK 200000000 /* QSF Clock 200MHz */ 78 79 #define A37X0_SPI_CONTROL 0x0 80 #define A37X0_SPI_CS_SHIFT 16 81 #define A37X0_SPI_CS_MASK (0xf << A37X0_SPI_CS_SHIFT) 82 #define A37X0_SPI_CONF 0x4 83 #define A37X0_SPI_WFIFO_THRS_SHIFT 28 84 #define A37X0_SPI_RFIFO_THRS_SHIFT 24 85 #define A37X0_SPI_AUTO_CS_EN (1 << 20) 86 #define A37X0_SPI_DMA_WR_EN (1 << 19) 87 #define A37X0_SPI_DMA_RD_EN (1 << 18) 88 #define A37X0_SPI_FIFO_MODE (1 << 17) 89 #define A37X0_SPI_SRST (1 << 16) 90 #define A37X0_SPI_XFER_START (1 << 15) 91 #define A37X0_SPI_XFER_STOP (1 << 14) 92 #define A37X0_SPI_INSTR_PIN (1 << 13) 93 #define A37X0_SPI_ADDR_PIN (1 << 12) 94 #define A37X0_SPI_DATA_PIN_MASK 0x3 95 #define A37X0_SPI_DATA_PIN_SHIFT 10 96 #define A37X0_SPI_FIFO_FLUSH (1 << 9) 97 #define A37X0_SPI_RW_EN (1 << 8) 98 #define A37X0_SPI_CLK_POL (1 << 7) 99 #define A37X0_SPI_CLK_PHASE (1 << 6) 100 #define A37X0_SPI_BYTE_LEN (1 << 5) 101 #define A37X0_SPI_PSC_MASK 0x1f 102 #define A37X0_SPI_DATA_OUT 0x8 103 #define A37X0_SPI_DATA_IN 0xc 104 #define A37X0_SPI_INTR_STAT 0x28 105 #define A37X0_SPI_INTR_MASK 0x2c 106 #define A37X0_SPI_RDY (1 << 1) 107 #define A37X0_SPI_XFER_DONE (1 << 0) 108 109 static struct ofw_compat_data compat_data[] = { 110 { "marvell,armada-3700-spi", 1 }, 111 { NULL, 0 } 112 }; 113 114 static void a37x0_spi_intr(void *); 115 116 static int 117 a37x0_spi_wait(struct a37x0_spi_softc *sc, int timeout, uint32_t reg, 118 uint32_t mask) 119 { 120 int i; 121 122 for (i = 0; i < timeout; i++) { 123 if ((A37X0_SPI_READ(sc, reg) & mask) == 0) 124 return (0); 125 DELAY(100); 126 } 127 128 return (ETIMEDOUT); 129 } 130 131 static int 132 a37x0_spi_probe(device_t dev) 133 { 134 135 if (!ofw_bus_status_okay(dev)) 136 return (ENXIO); 137 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 138 return (ENXIO); 139 device_set_desc(dev, "Armada 37x0 SPI controller"); 140 141 return (BUS_PROBE_DEFAULT); 142 } 143 144 static int 145 a37x0_spi_attach(device_t dev) 146 { 147 int err, rid; 148 pcell_t maxfreq; 149 struct a37x0_spi_softc *sc; 150 uint32_t reg; 151 152 sc = device_get_softc(dev); 153 sc->sc_dev = dev; 154 155 rid = 0; 156 sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 157 RF_ACTIVE); 158 if (!sc->sc_mem_res) { 159 device_printf(dev, "cannot allocate memory window\n"); 160 return (ENXIO); 161 } 162 163 sc->sc_bst = rman_get_bustag(sc->sc_mem_res); 164 sc->sc_bsh = rman_get_bushandle(sc->sc_mem_res); 165 166 rid = 0; 167 sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, 168 RF_ACTIVE); 169 if (!sc->sc_irq_res) { 170 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res); 171 device_printf(dev, "cannot allocate interrupt\n"); 172 return (ENXIO); 173 } 174 175 /* Make sure that no CS is asserted. */ 176 reg = A37X0_SPI_READ(sc, A37X0_SPI_CONTROL); 177 A37X0_SPI_WRITE(sc, A37X0_SPI_CONTROL, reg & ~A37X0_SPI_CS_MASK); 178 179 /* Reset FIFO. */ 180 reg = A37X0_SPI_READ(sc, A37X0_SPI_CONF); 181 A37X0_SPI_WRITE(sc, A37X0_SPI_CONF, reg | A37X0_SPI_FIFO_FLUSH); 182 err = a37x0_spi_wait(sc, 20, A37X0_SPI_CONF, A37X0_SPI_FIFO_FLUSH); 183 if (err != 0) { 184 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_irq_res); 185 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res); 186 device_printf(dev, "cannot flush the controller fifo.\n"); 187 return (ENXIO); 188 } 189 190 /* Reset the Controller. */ 191 reg = A37X0_SPI_READ(sc, A37X0_SPI_CONF); 192 A37X0_SPI_WRITE(sc, A37X0_SPI_CONF, reg | A37X0_SPI_SRST); 193 DELAY(1000); 194 /* Enable the single byte IO, disable FIFO. */ 195 reg &= ~(A37X0_SPI_FIFO_MODE | A37X0_SPI_BYTE_LEN); 196 A37X0_SPI_WRITE(sc, A37X0_SPI_CONF, reg); 197 198 /* Disable and clear interrupts. */ 199 A37X0_SPI_WRITE(sc, A37X0_SPI_INTR_MASK, 0); 200 reg = A37X0_SPI_READ(sc, A37X0_SPI_INTR_STAT); 201 A37X0_SPI_WRITE(sc, A37X0_SPI_INTR_STAT, reg); 202 203 /* Hook up our interrupt handler. */ 204 if (bus_setup_intr(dev, sc->sc_irq_res, INTR_TYPE_MISC | INTR_MPSAFE, 205 NULL, a37x0_spi_intr, sc, &sc->sc_intrhand)) { 206 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_irq_res); 207 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res); 208 device_printf(dev, "cannot setup the interrupt handler\n"); 209 return (ENXIO); 210 } 211 212 mtx_init(&sc->sc_mtx, "a37x0_spi", NULL, MTX_DEF); 213 214 /* Read the controller max-frequency. */ 215 if (OF_getencprop(ofw_bus_get_node(dev), "spi-max-frequency", &maxfreq, 216 sizeof(maxfreq)) == -1) 217 maxfreq = 0; 218 sc->sc_maxfreq = maxfreq; 219 220 device_add_child(dev, "spibus", -1); 221 222 /* Probe and attach the spibus when interrupts are available. */ 223 return (bus_delayed_attach_children(dev)); 224 } 225 226 static int 227 a37x0_spi_detach(device_t dev) 228 { 229 int err; 230 struct a37x0_spi_softc *sc; 231 232 if ((err = device_delete_children(dev)) != 0) 233 return (err); 234 sc = device_get_softc(dev); 235 mtx_destroy(&sc->sc_mtx); 236 if (sc->sc_intrhand) 237 bus_teardown_intr(dev, sc->sc_irq_res, sc->sc_intrhand); 238 if (sc->sc_irq_res) 239 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_irq_res); 240 if (sc->sc_mem_res) 241 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res); 242 243 return (0); 244 } 245 246 static __inline void 247 a37x0_spi_rx_byte(struct a37x0_spi_softc *sc) 248 { 249 struct spi_command *cmd; 250 uint32_t read; 251 uint8_t *p; 252 253 if (sc->sc_read == sc->sc_len) 254 return; 255 cmd = sc->sc_cmd; 256 p = (uint8_t *)cmd->rx_cmd; 257 read = sc->sc_read++; 258 if (read >= cmd->rx_cmd_sz) { 259 p = (uint8_t *)cmd->rx_data; 260 read -= cmd->rx_cmd_sz; 261 } 262 p[read] = A37X0_SPI_READ(sc, A37X0_SPI_DATA_IN) & 0xff; 263 } 264 265 static __inline void 266 a37x0_spi_tx_byte(struct a37x0_spi_softc *sc) 267 { 268 struct spi_command *cmd; 269 uint32_t written; 270 uint8_t *p; 271 272 if (sc->sc_written == sc->sc_len) 273 return; 274 cmd = sc->sc_cmd; 275 p = (uint8_t *)cmd->tx_cmd; 276 written = sc->sc_written++; 277 if (written >= cmd->tx_cmd_sz) { 278 p = (uint8_t *)cmd->tx_data; 279 written -= cmd->tx_cmd_sz; 280 } 281 A37X0_SPI_WRITE(sc, A37X0_SPI_DATA_OUT, p[written]); 282 } 283 284 static __inline void 285 a37x0_spi_set_clock(struct a37x0_spi_softc *sc, uint32_t clock) 286 { 287 uint32_t psc, reg; 288 289 if (sc->sc_maxfreq > 0 && clock > sc->sc_maxfreq) 290 clock = sc->sc_maxfreq; 291 psc = A37X0_SPI_CLOCK / clock; 292 if ((A37X0_SPI_CLOCK % clock) > 0) 293 psc++; 294 reg = A37X0_SPI_READ(sc, A37X0_SPI_CONF); 295 reg &= ~A37X0_SPI_PSC_MASK; 296 reg |= psc & A37X0_SPI_PSC_MASK; 297 A37X0_SPI_WRITE(sc, A37X0_SPI_CONF, reg); 298 } 299 300 static __inline void 301 a37x0_spi_set_pins(struct a37x0_spi_softc *sc, uint32_t npins) 302 { 303 uint32_t reg; 304 305 /* Sets single, dual or quad SPI mode. */ 306 reg = A37X0_SPI_READ(sc, A37X0_SPI_CONF); 307 reg &= ~(A37X0_SPI_DATA_PIN_MASK << A37X0_SPI_DATA_PIN_SHIFT); 308 reg |= (npins / 2) << A37X0_SPI_DATA_PIN_SHIFT; 309 reg |= A37X0_SPI_INSTR_PIN | A37X0_SPI_ADDR_PIN; 310 A37X0_SPI_WRITE(sc, A37X0_SPI_CONF, reg); 311 } 312 313 static __inline void 314 a37x0_spi_set_mode(struct a37x0_spi_softc *sc, uint32_t mode) 315 { 316 uint32_t reg; 317 318 reg = A37X0_SPI_READ(sc, A37X0_SPI_CONF); 319 switch (mode) { 320 case 0: 321 reg &= ~(A37X0_SPI_CLK_PHASE | A37X0_SPI_CLK_POL); 322 break; 323 case 1: 324 reg &= ~A37X0_SPI_CLK_POL; 325 reg |= A37X0_SPI_CLK_PHASE; 326 break; 327 case 2: 328 reg &= ~A37X0_SPI_CLK_PHASE; 329 reg |= A37X0_SPI_CLK_POL; 330 break; 331 case 3: 332 reg |= (A37X0_SPI_CLK_PHASE | A37X0_SPI_CLK_POL); 333 break; 334 } 335 A37X0_SPI_WRITE(sc, A37X0_SPI_CONF, reg); 336 } 337 338 static void 339 a37x0_spi_intr(void *arg) 340 { 341 struct a37x0_spi_softc *sc; 342 uint32_t status; 343 344 sc = (struct a37x0_spi_softc *)arg; 345 A37X0_SPI_LOCK(sc); 346 347 /* Filter stray interrupts. */ 348 if ((sc->sc_flags & A37X0_SPI_BUSY) == 0) { 349 A37X0_SPI_UNLOCK(sc); 350 return; 351 } 352 353 status = A37X0_SPI_READ(sc, A37X0_SPI_INTR_STAT); 354 if (status & A37X0_SPI_XFER_DONE) 355 a37x0_spi_rx_byte(sc); 356 357 /* Clear the interrupt status. */ 358 A37X0_SPI_WRITE(sc, A37X0_SPI_INTR_STAT, status); 359 360 /* Check for end of transfer. */ 361 if (sc->sc_written == sc->sc_len && sc->sc_read == sc->sc_len) 362 wakeup(sc->sc_dev); 363 else 364 a37x0_spi_tx_byte(sc); 365 366 A37X0_SPI_UNLOCK(sc); 367 } 368 369 static int 370 a37x0_spi_transfer(device_t dev, device_t child, struct spi_command *cmd) 371 { 372 int timeout; 373 struct a37x0_spi_softc *sc; 374 uint32_t clock, cs, mode, reg; 375 376 KASSERT(cmd->tx_cmd_sz == cmd->rx_cmd_sz, 377 ("TX/RX command sizes should be equal")); 378 KASSERT(cmd->tx_data_sz == cmd->rx_data_sz, 379 ("TX/RX data sizes should be equal")); 380 381 /* Get the proper data for this child. */ 382 spibus_get_cs(child, &cs); 383 cs &= ~SPIBUS_CS_HIGH; 384 if (cs > 3) { 385 device_printf(dev, 386 "Invalid CS %d requested by %s\n", cs, 387 device_get_nameunit(child)); 388 return (EINVAL); 389 } 390 spibus_get_clock(child, &clock); 391 if (clock == 0) { 392 device_printf(dev, 393 "Invalid clock %uHz requested by %s\n", clock, 394 device_get_nameunit(child)); 395 return (EINVAL); 396 } 397 spibus_get_mode(child, &mode); 398 if (mode > 3) { 399 device_printf(dev, 400 "Invalid mode %u requested by %s\n", mode, 401 device_get_nameunit(child)); 402 return (EINVAL); 403 } 404 405 sc = device_get_softc(dev); 406 A37X0_SPI_LOCK(sc); 407 408 /* Wait until the controller is free. */ 409 while (sc->sc_flags & A37X0_SPI_BUSY) 410 mtx_sleep(dev, &sc->sc_mtx, 0, "a37x0_spi", 0); 411 412 /* Now we have control over SPI controller. */ 413 sc->sc_flags = A37X0_SPI_BUSY; 414 415 /* Set transfer mode and clock. */ 416 a37x0_spi_set_mode(sc, mode); 417 a37x0_spi_set_pins(sc, 1); 418 a37x0_spi_set_clock(sc, clock); 419 420 /* Set CS. */ 421 A37X0_SPI_WRITE(sc, A37X0_SPI_CONTROL, 1 << (A37X0_SPI_CS_SHIFT + cs)); 422 423 /* Save a pointer to the SPI command. */ 424 sc->sc_cmd = cmd; 425 sc->sc_read = 0; 426 sc->sc_written = 0; 427 sc->sc_len = cmd->tx_cmd_sz + cmd->tx_data_sz; 428 429 /* Clear interrupts. */ 430 reg = A37X0_SPI_READ(sc, A37X0_SPI_INTR_STAT); 431 A37X0_SPI_WRITE(sc, A37X0_SPI_INTR_STAT, reg); 432 433 while ((sc->sc_len - sc->sc_written) > 0) { 434 /* 435 * Write to start the transmission and read the byte 436 * back when ready. 437 */ 438 a37x0_spi_tx_byte(sc); 439 timeout = 1000; 440 while (--timeout > 0) { 441 reg = A37X0_SPI_READ(sc, A37X0_SPI_CONTROL); 442 if (reg & A37X0_SPI_XFER_DONE) 443 break; 444 DELAY(1); 445 } 446 if (timeout == 0) 447 break; 448 a37x0_spi_rx_byte(sc); 449 } 450 451 /* Stop the controller. */ 452 reg = A37X0_SPI_READ(sc, A37X0_SPI_CONTROL); 453 A37X0_SPI_WRITE(sc, A37X0_SPI_CONTROL, reg & ~A37X0_SPI_CS_MASK); 454 A37X0_SPI_WRITE(sc, A37X0_SPI_INTR_MASK, 0); 455 456 /* Release the controller and wakeup the next thread waiting for it. */ 457 sc->sc_flags = 0; 458 wakeup_one(dev); 459 A37X0_SPI_UNLOCK(sc); 460 461 return ((timeout == 0) ? EIO : 0); 462 } 463 464 static phandle_t 465 a37x0_spi_get_node(device_t bus, device_t dev) 466 { 467 468 return (ofw_bus_get_node(bus)); 469 } 470 471 static device_method_t a37x0_spi_methods[] = { 472 /* Device interface */ 473 DEVMETHOD(device_probe, a37x0_spi_probe), 474 DEVMETHOD(device_attach, a37x0_spi_attach), 475 DEVMETHOD(device_detach, a37x0_spi_detach), 476 477 /* SPI interface */ 478 DEVMETHOD(spibus_transfer, a37x0_spi_transfer), 479 480 /* ofw_bus interface */ 481 DEVMETHOD(ofw_bus_get_node, a37x0_spi_get_node), 482 483 DEVMETHOD_END 484 }; 485 486 static devclass_t a37x0_spi_devclass; 487 488 static driver_t a37x0_spi_driver = { 489 "spi", 490 a37x0_spi_methods, 491 sizeof(struct a37x0_spi_softc), 492 }; 493 494 DRIVER_MODULE(a37x0_spi, simplebus, a37x0_spi_driver, a37x0_spi_devclass, 0, 0);
Cache object: 338cee83b96b6c090b735f91da104f12
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