1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Freescale SPI controller driver. 4 * 5 * Maintainer: Kumar Gala 6 * 7 * Copyright (C) 2006 Polycom, Inc. 8 * Copyright 2010 Freescale Semiconductor, Inc. 9 * 10 * CPM SPI and QE buffer descriptors mode support: 11 * Copyright (c) 2009 MontaVista Software, Inc. 12 * Author: Anton Vorontsov <avorontsov@ru.mvista.com> 13 * 14 * GRLIB support: 15 * Copyright (c) 2012 Aeroflex Gaisler AB. 16 * Author: Andreas Larsson <andreas@gaisler.com> 17 */ 18 #include <linux/delay.h> 19 #include <linux/dma-mapping.h> 20 #include <linux/fsl_devices.h> 21 #include <linux/gpio/consumer.h> 22 #include <linux/interrupt.h> 23 #include <linux/irq.h> 24 #include <linux/kernel.h> 25 #include <linux/mm.h> 26 #include <linux/module.h> 27 #include <linux/mutex.h> 28 #include <linux/of.h> 29 #include <linux/of_address.h> 30 #include <linux/of_irq.h> 31 #include <linux/of_platform.h> 32 #include <linux/platform_device.h> 33 #include <linux/spi/spi.h> 34 #include <linux/spi/spi_bitbang.h> 35 #include <linux/types.h> 36 37 #ifdef CONFIG_FSL_SOC 38 #include <sysdev/fsl_soc.h> 39 #endif 40 41 /* Specific to the MPC8306/MPC8309 */ 42 #define IMMR_SPI_CS_OFFSET 0x14c 43 #define SPI_BOOT_SEL_BIT 0x80000000 44 45 #include "spi-fsl-lib.h" 46 #include "spi-fsl-cpm.h" 47 #include "spi-fsl-spi.h" 48 49 #define TYPE_FSL 0 50 #define TYPE_GRLIB 1 51 52 struct fsl_spi_match_data { 53 int type; 54 }; 55 56 static struct fsl_spi_match_data of_fsl_spi_fsl_config = { 57 .type = TYPE_FSL, 58 }; 59 60 static struct fsl_spi_match_data of_fsl_spi_grlib_config = { 61 .type = TYPE_GRLIB, 62 }; 63 64 static const struct of_device_id of_fsl_spi_match[] = { 65 { 66 .compatible = "fsl,spi", 67 .data = &of_fsl_spi_fsl_config, 68 }, 69 { 70 .compatible = "aeroflexgaisler,spictrl", 71 .data = &of_fsl_spi_grlib_config, 72 }, 73 {} 74 }; 75 MODULE_DEVICE_TABLE(of, of_fsl_spi_match); 76 77 static int fsl_spi_get_type(struct device *dev) 78 { 79 const struct of_device_id *match; 80 81 if (dev->of_node) { 82 match = of_match_node(of_fsl_spi_match, dev->of_node); 83 if (match && match->data) 84 return ((struct fsl_spi_match_data *)match->data)->type; 85 } 86 return TYPE_FSL; 87 } 88 89 static void fsl_spi_change_mode(struct spi_device *spi) 90 { 91 struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master); 92 struct spi_mpc8xxx_cs *cs = spi->controller_state; 93 struct fsl_spi_reg *reg_base = mspi->reg_base; 94 __be32 __iomem *mode = ®_base->mode; 95 unsigned long flags; 96 97 if (cs->hw_mode == mpc8xxx_spi_read_reg(mode)) 98 return; 99 100 /* Turn off IRQs locally to minimize time that SPI is disabled. */ 101 local_irq_save(flags); 102 103 /* Turn off SPI unit prior changing mode */ 104 mpc8xxx_spi_write_reg(mode, cs->hw_mode & ~SPMODE_ENABLE); 105 106 /* When in CPM mode, we need to reinit tx and rx. */ 107 if (mspi->flags & SPI_CPM_MODE) { 108 fsl_spi_cpm_reinit_txrx(mspi); 109 } 110 mpc8xxx_spi_write_reg(mode, cs->hw_mode); 111 local_irq_restore(flags); 112 } 113 114 static void fsl_spi_chipselect(struct spi_device *spi, int value) 115 { 116 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); 117 struct fsl_spi_platform_data *pdata; 118 bool pol = spi->mode & SPI_CS_HIGH; 119 struct spi_mpc8xxx_cs *cs = spi->controller_state; 120 121 pdata = spi->dev.parent->parent->platform_data; 122 123 if (value == BITBANG_CS_INACTIVE) { 124 if (pdata->cs_control) 125 pdata->cs_control(spi, !pol); 126 } 127 128 if (value == BITBANG_CS_ACTIVE) { 129 mpc8xxx_spi->rx_shift = cs->rx_shift; 130 mpc8xxx_spi->tx_shift = cs->tx_shift; 131 mpc8xxx_spi->get_rx = cs->get_rx; 132 mpc8xxx_spi->get_tx = cs->get_tx; 133 134 fsl_spi_change_mode(spi); 135 136 if (pdata->cs_control) 137 pdata->cs_control(spi, pol); 138 } 139 } 140 141 static void fsl_spi_qe_cpu_set_shifts(u32 *rx_shift, u32 *tx_shift, 142 int bits_per_word, int msb_first) 143 { 144 *rx_shift = 0; 145 *tx_shift = 0; 146 if (msb_first) { 147 if (bits_per_word <= 8) { 148 *rx_shift = 16; 149 *tx_shift = 24; 150 } else if (bits_per_word <= 16) { 151 *rx_shift = 16; 152 *tx_shift = 16; 153 } 154 } else { 155 if (bits_per_word <= 8) 156 *rx_shift = 8; 157 } 158 } 159 160 static void fsl_spi_grlib_set_shifts(u32 *rx_shift, u32 *tx_shift, 161 int bits_per_word, int msb_first) 162 { 163 *rx_shift = 0; 164 *tx_shift = 0; 165 if (bits_per_word <= 16) { 166 if (msb_first) { 167 *rx_shift = 16; /* LSB in bit 16 */ 168 *tx_shift = 32 - bits_per_word; /* MSB in bit 31 */ 169 } else { 170 *rx_shift = 16 - bits_per_word; /* MSB in bit 15 */ 171 } 172 } 173 } 174 175 static int mspi_apply_cpu_mode_quirks(struct spi_mpc8xxx_cs *cs, 176 struct spi_device *spi, 177 struct mpc8xxx_spi *mpc8xxx_spi, 178 int bits_per_word) 179 { 180 cs->rx_shift = 0; 181 cs->tx_shift = 0; 182 if (bits_per_word <= 8) { 183 cs->get_rx = mpc8xxx_spi_rx_buf_u8; 184 cs->get_tx = mpc8xxx_spi_tx_buf_u8; 185 } else if (bits_per_word <= 16) { 186 cs->get_rx = mpc8xxx_spi_rx_buf_u16; 187 cs->get_tx = mpc8xxx_spi_tx_buf_u16; 188 } else if (bits_per_word <= 32) { 189 cs->get_rx = mpc8xxx_spi_rx_buf_u32; 190 cs->get_tx = mpc8xxx_spi_tx_buf_u32; 191 } else 192 return -EINVAL; 193 194 if (mpc8xxx_spi->set_shifts) 195 mpc8xxx_spi->set_shifts(&cs->rx_shift, &cs->tx_shift, 196 bits_per_word, 197 !(spi->mode & SPI_LSB_FIRST)); 198 199 mpc8xxx_spi->rx_shift = cs->rx_shift; 200 mpc8xxx_spi->tx_shift = cs->tx_shift; 201 mpc8xxx_spi->get_rx = cs->get_rx; 202 mpc8xxx_spi->get_tx = cs->get_tx; 203 204 return bits_per_word; 205 } 206 207 static int mspi_apply_qe_mode_quirks(struct spi_mpc8xxx_cs *cs, 208 struct spi_device *spi, 209 int bits_per_word) 210 { 211 /* QE uses Little Endian for words > 8 212 * so transform all words > 8 into 8 bits 213 * Unfortnatly that doesn't work for LSB so 214 * reject these for now */ 215 /* Note: 32 bits word, LSB works iff 216 * tfcr/rfcr is set to CPMFCR_GBL */ 217 if (spi->mode & SPI_LSB_FIRST && 218 bits_per_word > 8) 219 return -EINVAL; 220 if (bits_per_word > 8) 221 return 8; /* pretend its 8 bits */ 222 return bits_per_word; 223 } 224 225 static int fsl_spi_setup_transfer(struct spi_device *spi, 226 struct spi_transfer *t) 227 { 228 struct mpc8xxx_spi *mpc8xxx_spi; 229 int bits_per_word = 0; 230 u8 pm; 231 u32 hz = 0; 232 struct spi_mpc8xxx_cs *cs = spi->controller_state; 233 234 mpc8xxx_spi = spi_master_get_devdata(spi->master); 235 236 if (t) { 237 bits_per_word = t->bits_per_word; 238 hz = t->speed_hz; 239 } 240 241 /* spi_transfer level calls that work per-word */ 242 if (!bits_per_word) 243 bits_per_word = spi->bits_per_word; 244 245 if (!hz) 246 hz = spi->max_speed_hz; 247 248 if (!(mpc8xxx_spi->flags & SPI_CPM_MODE)) 249 bits_per_word = mspi_apply_cpu_mode_quirks(cs, spi, 250 mpc8xxx_spi, 251 bits_per_word); 252 else if (mpc8xxx_spi->flags & SPI_QE) 253 bits_per_word = mspi_apply_qe_mode_quirks(cs, spi, 254 bits_per_word); 255 256 if (bits_per_word < 0) 257 return bits_per_word; 258 259 if (bits_per_word == 32) 260 bits_per_word = 0; 261 else 262 bits_per_word = bits_per_word - 1; 263 264 /* mask out bits we are going to set */ 265 cs->hw_mode &= ~(SPMODE_LEN(0xF) | SPMODE_DIV16 266 | SPMODE_PM(0xF)); 267 268 cs->hw_mode |= SPMODE_LEN(bits_per_word); 269 270 if ((mpc8xxx_spi->spibrg / hz) > 64) { 271 cs->hw_mode |= SPMODE_DIV16; 272 pm = (mpc8xxx_spi->spibrg - 1) / (hz * 64) + 1; 273 WARN_ONCE(pm > 16, 274 "%s: Requested speed is too low: %d Hz. Will use %d Hz instead.\n", 275 dev_name(&spi->dev), hz, mpc8xxx_spi->spibrg / 1024); 276 if (pm > 16) 277 pm = 16; 278 } else { 279 pm = (mpc8xxx_spi->spibrg - 1) / (hz * 4) + 1; 280 } 281 if (pm) 282 pm--; 283 284 cs->hw_mode |= SPMODE_PM(pm); 285 286 fsl_spi_change_mode(spi); 287 return 0; 288 } 289 290 static int fsl_spi_cpu_bufs(struct mpc8xxx_spi *mspi, 291 struct spi_transfer *t, unsigned int len) 292 { 293 u32 word; 294 struct fsl_spi_reg *reg_base = mspi->reg_base; 295 296 mspi->count = len; 297 298 /* enable rx ints */ 299 mpc8xxx_spi_write_reg(®_base->mask, SPIM_NE); 300 301 /* transmit word */ 302 word = mspi->get_tx(mspi); 303 mpc8xxx_spi_write_reg(®_base->transmit, word); 304 305 return 0; 306 } 307 308 static int fsl_spi_bufs(struct spi_device *spi, struct spi_transfer *t, 309 bool is_dma_mapped) 310 { 311 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); 312 struct fsl_spi_reg *reg_base; 313 unsigned int len = t->len; 314 u8 bits_per_word; 315 int ret; 316 317 reg_base = mpc8xxx_spi->reg_base; 318 bits_per_word = spi->bits_per_word; 319 if (t->bits_per_word) 320 bits_per_word = t->bits_per_word; 321 322 if (bits_per_word > 8) { 323 /* invalid length? */ 324 if (len & 1) 325 return -EINVAL; 326 len /= 2; 327 } 328 if (bits_per_word > 16) { 329 /* invalid length? */ 330 if (len & 1) 331 return -EINVAL; 332 len /= 2; 333 } 334 335 mpc8xxx_spi->tx = t->tx_buf; 336 mpc8xxx_spi->rx = t->rx_buf; 337 338 reinit_completion(&mpc8xxx_spi->done); 339 340 if (mpc8xxx_spi->flags & SPI_CPM_MODE) 341 ret = fsl_spi_cpm_bufs(mpc8xxx_spi, t, is_dma_mapped); 342 else 343 ret = fsl_spi_cpu_bufs(mpc8xxx_spi, t, len); 344 if (ret) 345 return ret; 346 347 wait_for_completion(&mpc8xxx_spi->done); 348 349 /* disable rx ints */ 350 mpc8xxx_spi_write_reg(®_base->mask, 0); 351 352 if (mpc8xxx_spi->flags & SPI_CPM_MODE) 353 fsl_spi_cpm_bufs_complete(mpc8xxx_spi); 354 355 return mpc8xxx_spi->count; 356 } 357 358 static int fsl_spi_do_one_msg(struct spi_master *master, 359 struct spi_message *m) 360 { 361 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master); 362 struct spi_device *spi = m->spi; 363 struct spi_transfer *t, *first; 364 unsigned int cs_change; 365 const int nsecs = 50; 366 int status, last_bpw; 367 368 /* 369 * In CPU mode, optimize large byte transfers to use larger 370 * bits_per_word values to reduce number of interrupts taken. 371 */ 372 if (!(mpc8xxx_spi->flags & SPI_CPM_MODE)) { 373 list_for_each_entry(t, &m->transfers, transfer_list) { 374 if (t->len < 256 || t->bits_per_word != 8) 375 continue; 376 if ((t->len & 3) == 0) 377 t->bits_per_word = 32; 378 else if ((t->len & 1) == 0) 379 t->bits_per_word = 16; 380 } 381 } 382 383 /* Don't allow changes if CS is active */ 384 cs_change = 1; 385 list_for_each_entry(t, &m->transfers, transfer_list) { 386 if (cs_change) 387 first = t; 388 cs_change = t->cs_change; 389 if (first->speed_hz != t->speed_hz) { 390 dev_err(&spi->dev, 391 "speed_hz cannot change while CS is active\n"); 392 return -EINVAL; 393 } 394 } 395 396 last_bpw = -1; 397 cs_change = 1; 398 status = -EINVAL; 399 list_for_each_entry(t, &m->transfers, transfer_list) { 400 if (cs_change || last_bpw != t->bits_per_word) 401 status = fsl_spi_setup_transfer(spi, t); 402 if (status < 0) 403 break; 404 last_bpw = t->bits_per_word; 405 406 if (cs_change) { 407 fsl_spi_chipselect(spi, BITBANG_CS_ACTIVE); 408 ndelay(nsecs); 409 } 410 cs_change = t->cs_change; 411 if (t->len) 412 status = fsl_spi_bufs(spi, t, m->is_dma_mapped); 413 if (status) { 414 status = -EMSGSIZE; 415 break; 416 } 417 m->actual_length += t->len; 418 419 spi_transfer_delay_exec(t); 420 421 if (cs_change) { 422 ndelay(nsecs); 423 fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE); 424 ndelay(nsecs); 425 } 426 } 427 428 m->status = status; 429 430 if (status || !cs_change) { 431 ndelay(nsecs); 432 fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE); 433 } 434 435 fsl_spi_setup_transfer(spi, NULL); 436 spi_finalize_current_message(master); 437 return 0; 438 } 439 440 static int fsl_spi_setup(struct spi_device *spi) 441 { 442 struct mpc8xxx_spi *mpc8xxx_spi; 443 struct fsl_spi_reg *reg_base; 444 int retval; 445 u32 hw_mode; 446 struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi); 447 448 if (!spi->max_speed_hz) 449 return -EINVAL; 450 451 if (!cs) { 452 cs = kzalloc(sizeof(*cs), GFP_KERNEL); 453 if (!cs) 454 return -ENOMEM; 455 spi_set_ctldata(spi, cs); 456 } 457 mpc8xxx_spi = spi_master_get_devdata(spi->master); 458 459 reg_base = mpc8xxx_spi->reg_base; 460 461 hw_mode = cs->hw_mode; /* Save original settings */ 462 cs->hw_mode = mpc8xxx_spi_read_reg(®_base->mode); 463 /* mask out bits we are going to set */ 464 cs->hw_mode &= ~(SPMODE_CP_BEGIN_EDGECLK | SPMODE_CI_INACTIVEHIGH 465 | SPMODE_REV | SPMODE_LOOP); 466 467 if (spi->mode & SPI_CPHA) 468 cs->hw_mode |= SPMODE_CP_BEGIN_EDGECLK; 469 if (spi->mode & SPI_CPOL) 470 cs->hw_mode |= SPMODE_CI_INACTIVEHIGH; 471 if (!(spi->mode & SPI_LSB_FIRST)) 472 cs->hw_mode |= SPMODE_REV; 473 if (spi->mode & SPI_LOOP) 474 cs->hw_mode |= SPMODE_LOOP; 475 476 retval = fsl_spi_setup_transfer(spi, NULL); 477 if (retval < 0) { 478 cs->hw_mode = hw_mode; /* Restore settings */ 479 return retval; 480 } 481 482 /* Initialize chipselect - might be active for SPI_CS_HIGH mode */ 483 fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE); 484 485 return 0; 486 } 487 488 static void fsl_spi_cleanup(struct spi_device *spi) 489 { 490 struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi); 491 492 kfree(cs); 493 spi_set_ctldata(spi, NULL); 494 } 495 496 static void fsl_spi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events) 497 { 498 struct fsl_spi_reg *reg_base = mspi->reg_base; 499 500 /* We need handle RX first */ 501 if (events & SPIE_NE) { 502 u32 rx_data = mpc8xxx_spi_read_reg(®_base->receive); 503 504 if (mspi->rx) 505 mspi->get_rx(rx_data, mspi); 506 } 507 508 if ((events & SPIE_NF) == 0) 509 /* spin until TX is done */ 510 while (((events = 511 mpc8xxx_spi_read_reg(®_base->event)) & 512 SPIE_NF) == 0) 513 cpu_relax(); 514 515 /* Clear the events */ 516 mpc8xxx_spi_write_reg(®_base->event, events); 517 518 mspi->count -= 1; 519 if (mspi->count) { 520 u32 word = mspi->get_tx(mspi); 521 522 mpc8xxx_spi_write_reg(®_base->transmit, word); 523 } else { 524 complete(&mspi->done); 525 } 526 } 527 528 static irqreturn_t fsl_spi_irq(s32 irq, void *context_data) 529 { 530 struct mpc8xxx_spi *mspi = context_data; 531 irqreturn_t ret = IRQ_NONE; 532 u32 events; 533 struct fsl_spi_reg *reg_base = mspi->reg_base; 534 535 /* Get interrupt events(tx/rx) */ 536 events = mpc8xxx_spi_read_reg(®_base->event); 537 if (events) 538 ret = IRQ_HANDLED; 539 540 dev_dbg(mspi->dev, "%s: events %x\n", __func__, events); 541 542 if (mspi->flags & SPI_CPM_MODE) 543 fsl_spi_cpm_irq(mspi, events); 544 else 545 fsl_spi_cpu_irq(mspi, events); 546 547 return ret; 548 } 549 550 static void fsl_spi_grlib_cs_control(struct spi_device *spi, bool on) 551 { 552 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); 553 struct fsl_spi_reg *reg_base = mpc8xxx_spi->reg_base; 554 u32 slvsel; 555 u16 cs = spi->chip_select; 556 557 if (spi->cs_gpiod) { 558 gpiod_set_value(spi->cs_gpiod, on); 559 } else if (cs < mpc8xxx_spi->native_chipselects) { 560 slvsel = mpc8xxx_spi_read_reg(®_base->slvsel); 561 slvsel = on ? (slvsel | (1 << cs)) : (slvsel & ~(1 << cs)); 562 mpc8xxx_spi_write_reg(®_base->slvsel, slvsel); 563 } 564 } 565 566 static void fsl_spi_grlib_probe(struct device *dev) 567 { 568 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); 569 struct spi_master *master = dev_get_drvdata(dev); 570 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master); 571 struct fsl_spi_reg *reg_base = mpc8xxx_spi->reg_base; 572 int mbits; 573 u32 capabilities; 574 575 capabilities = mpc8xxx_spi_read_reg(®_base->cap); 576 577 mpc8xxx_spi->set_shifts = fsl_spi_grlib_set_shifts; 578 mbits = SPCAP_MAXWLEN(capabilities); 579 if (mbits) 580 mpc8xxx_spi->max_bits_per_word = mbits + 1; 581 582 mpc8xxx_spi->native_chipselects = 0; 583 if (SPCAP_SSEN(capabilities)) { 584 mpc8xxx_spi->native_chipselects = SPCAP_SSSZ(capabilities); 585 mpc8xxx_spi_write_reg(®_base->slvsel, 0xffffffff); 586 } 587 master->num_chipselect = mpc8xxx_spi->native_chipselects; 588 pdata->cs_control = fsl_spi_grlib_cs_control; 589 } 590 591 static struct spi_master * fsl_spi_probe(struct device *dev, 592 struct resource *mem, unsigned int irq) 593 { 594 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); 595 struct spi_master *master; 596 struct mpc8xxx_spi *mpc8xxx_spi; 597 struct fsl_spi_reg *reg_base; 598 u32 regval; 599 int ret = 0; 600 601 master = spi_alloc_master(dev, sizeof(struct mpc8xxx_spi)); 602 if (master == NULL) { 603 ret = -ENOMEM; 604 goto err; 605 } 606 607 dev_set_drvdata(dev, master); 608 609 mpc8xxx_spi_probe(dev, mem, irq); 610 611 master->setup = fsl_spi_setup; 612 master->cleanup = fsl_spi_cleanup; 613 master->transfer_one_message = fsl_spi_do_one_msg; 614 master->use_gpio_descriptors = true; 615 616 mpc8xxx_spi = spi_master_get_devdata(master); 617 mpc8xxx_spi->max_bits_per_word = 32; 618 mpc8xxx_spi->type = fsl_spi_get_type(dev); 619 620 ret = fsl_spi_cpm_init(mpc8xxx_spi); 621 if (ret) 622 goto err_cpm_init; 623 624 mpc8xxx_spi->reg_base = devm_ioremap_resource(dev, mem); 625 if (IS_ERR(mpc8xxx_spi->reg_base)) { 626 ret = PTR_ERR(mpc8xxx_spi->reg_base); 627 goto err_probe; 628 } 629 630 if (mpc8xxx_spi->type == TYPE_GRLIB) 631 fsl_spi_grlib_probe(dev); 632 633 master->bits_per_word_mask = 634 (SPI_BPW_RANGE_MASK(4, 16) | SPI_BPW_MASK(32)) & 635 SPI_BPW_RANGE_MASK(1, mpc8xxx_spi->max_bits_per_word); 636 637 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) 638 mpc8xxx_spi->set_shifts = fsl_spi_qe_cpu_set_shifts; 639 640 if (mpc8xxx_spi->set_shifts) 641 /* 8 bits per word and MSB first */ 642 mpc8xxx_spi->set_shifts(&mpc8xxx_spi->rx_shift, 643 &mpc8xxx_spi->tx_shift, 8, 1); 644 645 /* Register for SPI Interrupt */ 646 ret = devm_request_irq(dev, mpc8xxx_spi->irq, fsl_spi_irq, 647 0, "fsl_spi", mpc8xxx_spi); 648 649 if (ret != 0) 650 goto err_probe; 651 652 reg_base = mpc8xxx_spi->reg_base; 653 654 /* SPI controller initializations */ 655 mpc8xxx_spi_write_reg(®_base->mode, 0); 656 mpc8xxx_spi_write_reg(®_base->mask, 0); 657 mpc8xxx_spi_write_reg(®_base->command, 0); 658 mpc8xxx_spi_write_reg(®_base->event, 0xffffffff); 659 660 /* Enable SPI interface */ 661 regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE; 662 if (mpc8xxx_spi->max_bits_per_word < 8) { 663 regval &= ~SPMODE_LEN(0xF); 664 regval |= SPMODE_LEN(mpc8xxx_spi->max_bits_per_word - 1); 665 } 666 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) 667 regval |= SPMODE_OP; 668 669 mpc8xxx_spi_write_reg(®_base->mode, regval); 670 671 ret = devm_spi_register_master(dev, master); 672 if (ret < 0) 673 goto err_probe; 674 675 dev_info(dev, "at 0x%p (irq = %d), %s mode\n", reg_base, 676 mpc8xxx_spi->irq, mpc8xxx_spi_strmode(mpc8xxx_spi->flags)); 677 678 return master; 679 680 err_probe: 681 fsl_spi_cpm_free(mpc8xxx_spi); 682 err_cpm_init: 683 spi_master_put(master); 684 err: 685 return ERR_PTR(ret); 686 } 687 688 static void fsl_spi_cs_control(struct spi_device *spi, bool on) 689 { 690 if (spi->cs_gpiod) { 691 gpiod_set_value(spi->cs_gpiod, on); 692 } else { 693 struct device *dev = spi->dev.parent->parent; 694 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); 695 struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata); 696 697 if (WARN_ON_ONCE(!pinfo->immr_spi_cs)) 698 return; 699 iowrite32be(on ? SPI_BOOT_SEL_BIT : 0, pinfo->immr_spi_cs); 700 } 701 } 702 703 static int of_fsl_spi_probe(struct platform_device *ofdev) 704 { 705 struct device *dev = &ofdev->dev; 706 struct device_node *np = ofdev->dev.of_node; 707 struct spi_master *master; 708 struct resource mem; 709 int irq = 0, type; 710 int ret = -ENOMEM; 711 712 ret = of_mpc8xxx_spi_probe(ofdev); 713 if (ret) 714 return ret; 715 716 type = fsl_spi_get_type(&ofdev->dev); 717 if (type == TYPE_FSL) { 718 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); 719 #if IS_ENABLED(CONFIG_FSL_SOC) 720 struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata); 721 bool spisel_boot = of_property_read_bool(np, "fsl,spisel_boot"); 722 723 if (spisel_boot) { 724 pinfo->immr_spi_cs = ioremap(get_immrbase() + IMMR_SPI_CS_OFFSET, 4); 725 if (!pinfo->immr_spi_cs) { 726 ret = -ENOMEM; 727 goto err; 728 } 729 } 730 #endif 731 /* 732 * Handle the case where we have one hardwired (always selected) 733 * device on the first "chipselect". Else we let the core code 734 * handle any GPIOs or native chip selects and assign the 735 * appropriate callback for dealing with the CS lines. This isn't 736 * supported on the GRLIB variant. 737 */ 738 ret = gpiod_count(dev, "cs"); 739 if (ret <= 0) 740 pdata->max_chipselect = 1; 741 else 742 pdata->cs_control = fsl_spi_cs_control; 743 } 744 745 ret = of_address_to_resource(np, 0, &mem); 746 if (ret) 747 goto err; 748 749 irq = platform_get_irq(ofdev, 0); 750 if (irq < 0) { 751 ret = irq; 752 goto err; 753 } 754 755 master = fsl_spi_probe(dev, &mem, irq); 756 if (IS_ERR(master)) { 757 ret = PTR_ERR(master); 758 goto err; 759 } 760 761 return 0; 762 763 err: 764 return ret; 765 } 766 767 static int of_fsl_spi_remove(struct platform_device *ofdev) 768 { 769 struct spi_master *master = platform_get_drvdata(ofdev); 770 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master); 771 772 fsl_spi_cpm_free(mpc8xxx_spi); 773 return 0; 774 } 775 776 static struct platform_driver of_fsl_spi_driver = { 777 .driver = { 778 .name = "fsl_spi", 779 .of_match_table = of_fsl_spi_match, 780 }, 781 .probe = of_fsl_spi_probe, 782 .remove = of_fsl_spi_remove, 783 }; 784 785 #ifdef CONFIG_MPC832x_RDB 786 /* 787 * XXX XXX XXX 788 * This is "legacy" platform driver, was used by the MPC8323E-RDB boards 789 * only. The driver should go away soon, since newer MPC8323E-RDB's device 790 * tree can work with OpenFirmware driver. But for now we support old trees 791 * as well. 792 */ 793 static int plat_mpc8xxx_spi_probe(struct platform_device *pdev) 794 { 795 struct resource *mem; 796 int irq; 797 struct spi_master *master; 798 799 if (!dev_get_platdata(&pdev->dev)) 800 return -EINVAL; 801 802 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 803 if (!mem) 804 return -EINVAL; 805 806 irq = platform_get_irq(pdev, 0); 807 if (irq <= 0) 808 return -EINVAL; 809 810 master = fsl_spi_probe(&pdev->dev, mem, irq); 811 return PTR_ERR_OR_ZERO(master); 812 } 813 814 static int plat_mpc8xxx_spi_remove(struct platform_device *pdev) 815 { 816 struct spi_master *master = platform_get_drvdata(pdev); 817 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master); 818 819 fsl_spi_cpm_free(mpc8xxx_spi); 820 821 return 0; 822 } 823 824 MODULE_ALIAS("platform:mpc8xxx_spi"); 825 static struct platform_driver mpc8xxx_spi_driver = { 826 .probe = plat_mpc8xxx_spi_probe, 827 .remove = plat_mpc8xxx_spi_remove, 828 .driver = { 829 .name = "mpc8xxx_spi", 830 }, 831 }; 832 833 static bool legacy_driver_failed; 834 835 static void __init legacy_driver_register(void) 836 { 837 legacy_driver_failed = platform_driver_register(&mpc8xxx_spi_driver); 838 } 839 840 static void __exit legacy_driver_unregister(void) 841 { 842 if (legacy_driver_failed) 843 return; 844 platform_driver_unregister(&mpc8xxx_spi_driver); 845 } 846 #else 847 static void __init legacy_driver_register(void) {} 848 static void __exit legacy_driver_unregister(void) {} 849 #endif /* CONFIG_MPC832x_RDB */ 850 851 static int __init fsl_spi_init(void) 852 { 853 legacy_driver_register(); 854 return platform_driver_register(&of_fsl_spi_driver); 855 } 856 module_init(fsl_spi_init); 857 858 static void __exit fsl_spi_exit(void) 859 { 860 platform_driver_unregister(&of_fsl_spi_driver); 861 legacy_driver_unregister(); 862 } 863 module_exit(fsl_spi_exit); 864 865 MODULE_AUTHOR("Kumar Gala"); 866 MODULE_DESCRIPTION("Simple Freescale SPI Driver"); 867 MODULE_LICENSE("GPL"); 868