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.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_gpio.h> 32 #include <linux/of_platform.h> 33 #include <linux/platform_device.h> 34 #include <linux/spi/spi.h> 35 #include <linux/spi/spi_bitbang.h> 36 #include <linux/types.h> 37 38 #ifdef CONFIG_FSL_SOC 39 #include <sysdev/fsl_soc.h> 40 #endif 41 42 /* Specific to the MPC8306/MPC8309 */ 43 #define IMMR_SPI_CS_OFFSET 0x14c 44 #define SPI_BOOT_SEL_BIT 0x80000000 45 46 #include "spi-fsl-lib.h" 47 #include "spi-fsl-cpm.h" 48 #include "spi-fsl-spi.h" 49 50 #define TYPE_FSL 0 51 #define TYPE_GRLIB 1 52 53 struct fsl_spi_match_data { 54 int type; 55 }; 56 57 static struct fsl_spi_match_data of_fsl_spi_fsl_config = { 58 .type = TYPE_FSL, 59 }; 60 61 static struct fsl_spi_match_data of_fsl_spi_grlib_config = { 62 .type = TYPE_GRLIB, 63 }; 64 65 static const struct of_device_id of_fsl_spi_match[] = { 66 { 67 .compatible = "fsl,spi", 68 .data = &of_fsl_spi_fsl_config, 69 }, 70 { 71 .compatible = "aeroflexgaisler,spictrl", 72 .data = &of_fsl_spi_grlib_config, 73 }, 74 {} 75 }; 76 MODULE_DEVICE_TABLE(of, of_fsl_spi_match); 77 78 static int fsl_spi_get_type(struct device *dev) 79 { 80 const struct of_device_id *match; 81 82 if (dev->of_node) { 83 match = of_match_node(of_fsl_spi_match, dev->of_node); 84 if (match && match->data) 85 return ((struct fsl_spi_match_data *)match->data)->type; 86 } 87 return TYPE_FSL; 88 } 89 90 static void fsl_spi_change_mode(struct spi_device *spi) 91 { 92 struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master); 93 struct spi_mpc8xxx_cs *cs = spi->controller_state; 94 struct fsl_spi_reg *reg_base = mspi->reg_base; 95 __be32 __iomem *mode = ®_base->mode; 96 unsigned long flags; 97 98 if (cs->hw_mode == mpc8xxx_spi_read_reg(mode)) 99 return; 100 101 /* Turn off IRQs locally to minimize time that SPI is disabled. */ 102 local_irq_save(flags); 103 104 /* Turn off SPI unit prior changing mode */ 105 mpc8xxx_spi_write_reg(mode, cs->hw_mode & ~SPMODE_ENABLE); 106 107 /* When in CPM mode, we need to reinit tx and rx. */ 108 if (mspi->flags & SPI_CPM_MODE) { 109 fsl_spi_cpm_reinit_txrx(mspi); 110 } 111 mpc8xxx_spi_write_reg(mode, cs->hw_mode); 112 local_irq_restore(flags); 113 } 114 115 static void fsl_spi_chipselect(struct spi_device *spi, int value) 116 { 117 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); 118 struct fsl_spi_platform_data *pdata; 119 bool pol = spi->mode & SPI_CS_HIGH; 120 struct spi_mpc8xxx_cs *cs = spi->controller_state; 121 122 pdata = spi->dev.parent->parent->platform_data; 123 124 if (value == BITBANG_CS_INACTIVE) { 125 if (pdata->cs_control) 126 pdata->cs_control(spi, !pol); 127 } 128 129 if (value == BITBANG_CS_ACTIVE) { 130 mpc8xxx_spi->rx_shift = cs->rx_shift; 131 mpc8xxx_spi->tx_shift = cs->tx_shift; 132 mpc8xxx_spi->get_rx = cs->get_rx; 133 mpc8xxx_spi->get_tx = cs->get_tx; 134 135 fsl_spi_change_mode(spi); 136 137 if (pdata->cs_control) 138 pdata->cs_control(spi, pol); 139 } 140 } 141 142 static void fsl_spi_qe_cpu_set_shifts(u32 *rx_shift, u32 *tx_shift, 143 int bits_per_word, int msb_first) 144 { 145 *rx_shift = 0; 146 *tx_shift = 0; 147 if (msb_first) { 148 if (bits_per_word <= 8) { 149 *rx_shift = 16; 150 *tx_shift = 24; 151 } else if (bits_per_word <= 16) { 152 *rx_shift = 16; 153 *tx_shift = 16; 154 } 155 } else { 156 if (bits_per_word <= 8) 157 *rx_shift = 8; 158 } 159 } 160 161 static void fsl_spi_grlib_set_shifts(u32 *rx_shift, u32 *tx_shift, 162 int bits_per_word, int msb_first) 163 { 164 *rx_shift = 0; 165 *tx_shift = 0; 166 if (bits_per_word <= 16) { 167 if (msb_first) { 168 *rx_shift = 16; /* LSB in bit 16 */ 169 *tx_shift = 32 - bits_per_word; /* MSB in bit 31 */ 170 } else { 171 *rx_shift = 16 - bits_per_word; /* MSB in bit 15 */ 172 } 173 } 174 } 175 176 static int mspi_apply_cpu_mode_quirks(struct spi_mpc8xxx_cs *cs, 177 struct spi_device *spi, 178 struct mpc8xxx_spi *mpc8xxx_spi, 179 int bits_per_word) 180 { 181 cs->rx_shift = 0; 182 cs->tx_shift = 0; 183 if (bits_per_word <= 8) { 184 cs->get_rx = mpc8xxx_spi_rx_buf_u8; 185 cs->get_tx = mpc8xxx_spi_tx_buf_u8; 186 } else if (bits_per_word <= 16) { 187 cs->get_rx = mpc8xxx_spi_rx_buf_u16; 188 cs->get_tx = mpc8xxx_spi_tx_buf_u16; 189 } else if (bits_per_word <= 32) { 190 cs->get_rx = mpc8xxx_spi_rx_buf_u32; 191 cs->get_tx = mpc8xxx_spi_tx_buf_u32; 192 } else 193 return -EINVAL; 194 195 if (mpc8xxx_spi->set_shifts) 196 mpc8xxx_spi->set_shifts(&cs->rx_shift, &cs->tx_shift, 197 bits_per_word, 198 !(spi->mode & SPI_LSB_FIRST)); 199 200 mpc8xxx_spi->rx_shift = cs->rx_shift; 201 mpc8xxx_spi->tx_shift = cs->tx_shift; 202 mpc8xxx_spi->get_rx = cs->get_rx; 203 mpc8xxx_spi->get_tx = cs->get_tx; 204 205 return bits_per_word; 206 } 207 208 static int mspi_apply_qe_mode_quirks(struct spi_mpc8xxx_cs *cs, 209 struct spi_device *spi, 210 int bits_per_word) 211 { 212 /* QE uses Little Endian for words > 8 213 * so transform all words > 8 into 8 bits 214 * Unfortnatly that doesn't work for LSB so 215 * reject these for now */ 216 /* Note: 32 bits word, LSB works iff 217 * tfcr/rfcr is set to CPMFCR_GBL */ 218 if (spi->mode & SPI_LSB_FIRST && 219 bits_per_word > 8) 220 return -EINVAL; 221 if (bits_per_word > 8) 222 return 8; /* pretend its 8 bits */ 223 return bits_per_word; 224 } 225 226 static int fsl_spi_setup_transfer(struct spi_device *spi, 227 struct spi_transfer *t) 228 { 229 struct mpc8xxx_spi *mpc8xxx_spi; 230 int bits_per_word = 0; 231 u8 pm; 232 u32 hz = 0; 233 struct spi_mpc8xxx_cs *cs = spi->controller_state; 234 235 mpc8xxx_spi = spi_master_get_devdata(spi->master); 236 237 if (t) { 238 bits_per_word = t->bits_per_word; 239 hz = t->speed_hz; 240 } 241 242 /* spi_transfer level calls that work per-word */ 243 if (!bits_per_word) 244 bits_per_word = spi->bits_per_word; 245 246 if (!hz) 247 hz = spi->max_speed_hz; 248 249 if (!(mpc8xxx_spi->flags & SPI_CPM_MODE)) 250 bits_per_word = mspi_apply_cpu_mode_quirks(cs, spi, 251 mpc8xxx_spi, 252 bits_per_word); 253 else if (mpc8xxx_spi->flags & SPI_QE) 254 bits_per_word = mspi_apply_qe_mode_quirks(cs, spi, 255 bits_per_word); 256 257 if (bits_per_word < 0) 258 return bits_per_word; 259 260 if (bits_per_word == 32) 261 bits_per_word = 0; 262 else 263 bits_per_word = bits_per_word - 1; 264 265 /* mask out bits we are going to set */ 266 cs->hw_mode &= ~(SPMODE_LEN(0xF) | SPMODE_DIV16 267 | SPMODE_PM(0xF)); 268 269 cs->hw_mode |= SPMODE_LEN(bits_per_word); 270 271 if ((mpc8xxx_spi->spibrg / hz) > 64) { 272 cs->hw_mode |= SPMODE_DIV16; 273 pm = (mpc8xxx_spi->spibrg - 1) / (hz * 64) + 1; 274 WARN_ONCE(pm > 16, 275 "%s: Requested speed is too low: %d Hz. Will use %d Hz instead.\n", 276 dev_name(&spi->dev), hz, mpc8xxx_spi->spibrg / 1024); 277 if (pm > 16) 278 pm = 16; 279 } else { 280 pm = (mpc8xxx_spi->spibrg - 1) / (hz * 4) + 1; 281 } 282 if (pm) 283 pm--; 284 285 cs->hw_mode |= SPMODE_PM(pm); 286 287 fsl_spi_change_mode(spi); 288 return 0; 289 } 290 291 static int fsl_spi_cpu_bufs(struct mpc8xxx_spi *mspi, 292 struct spi_transfer *t, unsigned int len) 293 { 294 u32 word; 295 struct fsl_spi_reg *reg_base = mspi->reg_base; 296 297 mspi->count = len; 298 299 /* enable rx ints */ 300 mpc8xxx_spi_write_reg(®_base->mask, SPIM_NE); 301 302 /* transmit word */ 303 word = mspi->get_tx(mspi); 304 mpc8xxx_spi_write_reg(®_base->transmit, word); 305 306 return 0; 307 } 308 309 static int fsl_spi_bufs(struct spi_device *spi, struct spi_transfer *t, 310 bool is_dma_mapped) 311 { 312 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); 313 struct fsl_spi_reg *reg_base; 314 unsigned int len = t->len; 315 u8 bits_per_word; 316 int ret; 317 318 reg_base = mpc8xxx_spi->reg_base; 319 bits_per_word = spi->bits_per_word; 320 if (t->bits_per_word) 321 bits_per_word = t->bits_per_word; 322 323 if (bits_per_word > 8) { 324 /* invalid length? */ 325 if (len & 1) 326 return -EINVAL; 327 len /= 2; 328 } 329 if (bits_per_word > 16) { 330 /* invalid length? */ 331 if (len & 1) 332 return -EINVAL; 333 len /= 2; 334 } 335 336 mpc8xxx_spi->tx = t->tx_buf; 337 mpc8xxx_spi->rx = t->rx_buf; 338 339 reinit_completion(&mpc8xxx_spi->done); 340 341 if (mpc8xxx_spi->flags & SPI_CPM_MODE) 342 ret = fsl_spi_cpm_bufs(mpc8xxx_spi, t, is_dma_mapped); 343 else 344 ret = fsl_spi_cpu_bufs(mpc8xxx_spi, t, len); 345 if (ret) 346 return ret; 347 348 wait_for_completion(&mpc8xxx_spi->done); 349 350 /* disable rx ints */ 351 mpc8xxx_spi_write_reg(®_base->mask, 0); 352 353 if (mpc8xxx_spi->flags & SPI_CPM_MODE) 354 fsl_spi_cpm_bufs_complete(mpc8xxx_spi); 355 356 return mpc8xxx_spi->count; 357 } 358 359 static int fsl_spi_do_one_msg(struct spi_master *master, 360 struct spi_message *m) 361 { 362 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master); 363 struct spi_device *spi = m->spi; 364 struct spi_transfer *t, *first; 365 unsigned int cs_change; 366 const int nsecs = 50; 367 int status, last_bpw; 368 369 /* 370 * In CPU mode, optimize large byte transfers to use larger 371 * bits_per_word values to reduce number of interrupts taken. 372 */ 373 if (!(mpc8xxx_spi->flags & SPI_CPM_MODE)) { 374 list_for_each_entry(t, &m->transfers, transfer_list) { 375 if (t->len < 256 || t->bits_per_word != 8) 376 continue; 377 if ((t->len & 3) == 0) 378 t->bits_per_word = 32; 379 else if ((t->len & 1) == 0) 380 t->bits_per_word = 16; 381 } 382 } 383 384 /* Don't allow changes if CS is active */ 385 cs_change = 1; 386 list_for_each_entry(t, &m->transfers, transfer_list) { 387 if (cs_change) 388 first = t; 389 cs_change = t->cs_change; 390 if (first->speed_hz != t->speed_hz) { 391 dev_err(&spi->dev, 392 "speed_hz cannot change while CS is active\n"); 393 return -EINVAL; 394 } 395 } 396 397 last_bpw = -1; 398 cs_change = 1; 399 status = -EINVAL; 400 list_for_each_entry(t, &m->transfers, transfer_list) { 401 if (cs_change || last_bpw != t->bits_per_word) 402 status = fsl_spi_setup_transfer(spi, t); 403 if (status < 0) 404 break; 405 last_bpw = t->bits_per_word; 406 407 if (cs_change) { 408 fsl_spi_chipselect(spi, BITBANG_CS_ACTIVE); 409 ndelay(nsecs); 410 } 411 cs_change = t->cs_change; 412 if (t->len) 413 status = fsl_spi_bufs(spi, t, m->is_dma_mapped); 414 if (status) { 415 status = -EMSGSIZE; 416 break; 417 } 418 m->actual_length += t->len; 419 420 if (t->delay_usecs) 421 udelay(t->delay_usecs); 422 423 if (cs_change) { 424 ndelay(nsecs); 425 fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE); 426 ndelay(nsecs); 427 } 428 } 429 430 m->status = status; 431 432 if (status || !cs_change) { 433 ndelay(nsecs); 434 fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE); 435 } 436 437 fsl_spi_setup_transfer(spi, NULL); 438 spi_finalize_current_message(master); 439 return 0; 440 } 441 442 static int fsl_spi_setup(struct spi_device *spi) 443 { 444 struct mpc8xxx_spi *mpc8xxx_spi; 445 struct fsl_spi_reg *reg_base; 446 int retval; 447 u32 hw_mode; 448 struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi); 449 450 if (!spi->max_speed_hz) 451 return -EINVAL; 452 453 if (!cs) { 454 cs = kzalloc(sizeof(*cs), GFP_KERNEL); 455 if (!cs) 456 return -ENOMEM; 457 spi_set_ctldata(spi, cs); 458 } 459 mpc8xxx_spi = spi_master_get_devdata(spi->master); 460 461 reg_base = mpc8xxx_spi->reg_base; 462 463 hw_mode = cs->hw_mode; /* Save original settings */ 464 cs->hw_mode = mpc8xxx_spi_read_reg(®_base->mode); 465 /* mask out bits we are going to set */ 466 cs->hw_mode &= ~(SPMODE_CP_BEGIN_EDGECLK | SPMODE_CI_INACTIVEHIGH 467 | SPMODE_REV | SPMODE_LOOP); 468 469 if (spi->mode & SPI_CPHA) 470 cs->hw_mode |= SPMODE_CP_BEGIN_EDGECLK; 471 if (spi->mode & SPI_CPOL) 472 cs->hw_mode |= SPMODE_CI_INACTIVEHIGH; 473 if (!(spi->mode & SPI_LSB_FIRST)) 474 cs->hw_mode |= SPMODE_REV; 475 if (spi->mode & SPI_LOOP) 476 cs->hw_mode |= SPMODE_LOOP; 477 478 retval = fsl_spi_setup_transfer(spi, NULL); 479 if (retval < 0) { 480 cs->hw_mode = hw_mode; /* Restore settings */ 481 return retval; 482 } 483 484 if (mpc8xxx_spi->type == TYPE_GRLIB) { 485 if (gpio_is_valid(spi->cs_gpio)) { 486 int desel; 487 488 retval = gpio_request(spi->cs_gpio, 489 dev_name(&spi->dev)); 490 if (retval) 491 return retval; 492 493 desel = !(spi->mode & SPI_CS_HIGH); 494 retval = gpio_direction_output(spi->cs_gpio, desel); 495 if (retval) { 496 gpio_free(spi->cs_gpio); 497 return retval; 498 } 499 } else if (spi->cs_gpio != -ENOENT) { 500 if (spi->cs_gpio < 0) 501 return spi->cs_gpio; 502 return -EINVAL; 503 } 504 /* When spi->cs_gpio == -ENOENT, a hole in the phandle list 505 * indicates to use native chipselect if present, or allow for 506 * an always selected chip 507 */ 508 } 509 510 /* Initialize chipselect - might be active for SPI_CS_HIGH mode */ 511 fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE); 512 513 return 0; 514 } 515 516 static void fsl_spi_cleanup(struct spi_device *spi) 517 { 518 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); 519 struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi); 520 521 if (mpc8xxx_spi->type == TYPE_GRLIB && gpio_is_valid(spi->cs_gpio)) 522 gpio_free(spi->cs_gpio); 523 524 kfree(cs); 525 spi_set_ctldata(spi, NULL); 526 } 527 528 static void fsl_spi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events) 529 { 530 struct fsl_spi_reg *reg_base = mspi->reg_base; 531 532 /* We need handle RX first */ 533 if (events & SPIE_NE) { 534 u32 rx_data = mpc8xxx_spi_read_reg(®_base->receive); 535 536 if (mspi->rx) 537 mspi->get_rx(rx_data, mspi); 538 } 539 540 if ((events & SPIE_NF) == 0) 541 /* spin until TX is done */ 542 while (((events = 543 mpc8xxx_spi_read_reg(®_base->event)) & 544 SPIE_NF) == 0) 545 cpu_relax(); 546 547 /* Clear the events */ 548 mpc8xxx_spi_write_reg(®_base->event, events); 549 550 mspi->count -= 1; 551 if (mspi->count) { 552 u32 word = mspi->get_tx(mspi); 553 554 mpc8xxx_spi_write_reg(®_base->transmit, word); 555 } else { 556 complete(&mspi->done); 557 } 558 } 559 560 static irqreturn_t fsl_spi_irq(s32 irq, void *context_data) 561 { 562 struct mpc8xxx_spi *mspi = context_data; 563 irqreturn_t ret = IRQ_NONE; 564 u32 events; 565 struct fsl_spi_reg *reg_base = mspi->reg_base; 566 567 /* Get interrupt events(tx/rx) */ 568 events = mpc8xxx_spi_read_reg(®_base->event); 569 if (events) 570 ret = IRQ_HANDLED; 571 572 dev_dbg(mspi->dev, "%s: events %x\n", __func__, events); 573 574 if (mspi->flags & SPI_CPM_MODE) 575 fsl_spi_cpm_irq(mspi, events); 576 else 577 fsl_spi_cpu_irq(mspi, events); 578 579 return ret; 580 } 581 582 static void fsl_spi_grlib_cs_control(struct spi_device *spi, bool on) 583 { 584 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); 585 struct fsl_spi_reg *reg_base = mpc8xxx_spi->reg_base; 586 u32 slvsel; 587 u16 cs = spi->chip_select; 588 589 if (gpio_is_valid(spi->cs_gpio)) { 590 gpio_set_value(spi->cs_gpio, on); 591 } else if (cs < mpc8xxx_spi->native_chipselects) { 592 slvsel = mpc8xxx_spi_read_reg(®_base->slvsel); 593 slvsel = on ? (slvsel | (1 << cs)) : (slvsel & ~(1 << cs)); 594 mpc8xxx_spi_write_reg(®_base->slvsel, slvsel); 595 } 596 } 597 598 static void fsl_spi_grlib_probe(struct device *dev) 599 { 600 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); 601 struct spi_master *master = dev_get_drvdata(dev); 602 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master); 603 struct fsl_spi_reg *reg_base = mpc8xxx_spi->reg_base; 604 int mbits; 605 u32 capabilities; 606 607 capabilities = mpc8xxx_spi_read_reg(®_base->cap); 608 609 mpc8xxx_spi->set_shifts = fsl_spi_grlib_set_shifts; 610 mbits = SPCAP_MAXWLEN(capabilities); 611 if (mbits) 612 mpc8xxx_spi->max_bits_per_word = mbits + 1; 613 614 mpc8xxx_spi->native_chipselects = 0; 615 if (SPCAP_SSEN(capabilities)) { 616 mpc8xxx_spi->native_chipselects = SPCAP_SSSZ(capabilities); 617 mpc8xxx_spi_write_reg(®_base->slvsel, 0xffffffff); 618 } 619 master->num_chipselect = mpc8xxx_spi->native_chipselects; 620 pdata->cs_control = fsl_spi_grlib_cs_control; 621 } 622 623 static struct spi_master * fsl_spi_probe(struct device *dev, 624 struct resource *mem, unsigned int irq) 625 { 626 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); 627 struct spi_master *master; 628 struct mpc8xxx_spi *mpc8xxx_spi; 629 struct fsl_spi_reg *reg_base; 630 u32 regval; 631 int ret = 0; 632 633 master = spi_alloc_master(dev, sizeof(struct mpc8xxx_spi)); 634 if (master == NULL) { 635 ret = -ENOMEM; 636 goto err; 637 } 638 639 dev_set_drvdata(dev, master); 640 641 mpc8xxx_spi_probe(dev, mem, irq); 642 643 master->setup = fsl_spi_setup; 644 master->cleanup = fsl_spi_cleanup; 645 master->transfer_one_message = fsl_spi_do_one_msg; 646 647 mpc8xxx_spi = spi_master_get_devdata(master); 648 mpc8xxx_spi->max_bits_per_word = 32; 649 mpc8xxx_spi->type = fsl_spi_get_type(dev); 650 651 ret = fsl_spi_cpm_init(mpc8xxx_spi); 652 if (ret) 653 goto err_cpm_init; 654 655 mpc8xxx_spi->reg_base = devm_ioremap_resource(dev, mem); 656 if (IS_ERR(mpc8xxx_spi->reg_base)) { 657 ret = PTR_ERR(mpc8xxx_spi->reg_base); 658 goto err_probe; 659 } 660 661 if (mpc8xxx_spi->type == TYPE_GRLIB) 662 fsl_spi_grlib_probe(dev); 663 664 master->bits_per_word_mask = 665 (SPI_BPW_RANGE_MASK(4, 16) | SPI_BPW_MASK(32)) & 666 SPI_BPW_RANGE_MASK(1, mpc8xxx_spi->max_bits_per_word); 667 668 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) 669 mpc8xxx_spi->set_shifts = fsl_spi_qe_cpu_set_shifts; 670 671 if (mpc8xxx_spi->set_shifts) 672 /* 8 bits per word and MSB first */ 673 mpc8xxx_spi->set_shifts(&mpc8xxx_spi->rx_shift, 674 &mpc8xxx_spi->tx_shift, 8, 1); 675 676 /* Register for SPI Interrupt */ 677 ret = devm_request_irq(dev, mpc8xxx_spi->irq, fsl_spi_irq, 678 0, "fsl_spi", mpc8xxx_spi); 679 680 if (ret != 0) 681 goto err_probe; 682 683 reg_base = mpc8xxx_spi->reg_base; 684 685 /* SPI controller initializations */ 686 mpc8xxx_spi_write_reg(®_base->mode, 0); 687 mpc8xxx_spi_write_reg(®_base->mask, 0); 688 mpc8xxx_spi_write_reg(®_base->command, 0); 689 mpc8xxx_spi_write_reg(®_base->event, 0xffffffff); 690 691 /* Enable SPI interface */ 692 regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE; 693 if (mpc8xxx_spi->max_bits_per_word < 8) { 694 regval &= ~SPMODE_LEN(0xF); 695 regval |= SPMODE_LEN(mpc8xxx_spi->max_bits_per_word - 1); 696 } 697 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) 698 regval |= SPMODE_OP; 699 700 mpc8xxx_spi_write_reg(®_base->mode, regval); 701 702 ret = devm_spi_register_master(dev, master); 703 if (ret < 0) 704 goto err_probe; 705 706 dev_info(dev, "at 0x%p (irq = %d), %s mode\n", reg_base, 707 mpc8xxx_spi->irq, mpc8xxx_spi_strmode(mpc8xxx_spi->flags)); 708 709 return master; 710 711 err_probe: 712 fsl_spi_cpm_free(mpc8xxx_spi); 713 err_cpm_init: 714 spi_master_put(master); 715 err: 716 return ERR_PTR(ret); 717 } 718 719 static void fsl_spi_cs_control(struct spi_device *spi, bool on) 720 { 721 struct device *dev = spi->dev.parent->parent; 722 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); 723 struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata); 724 u16 cs = spi->chip_select; 725 726 if (cs < pinfo->ngpios) { 727 int gpio = pinfo->gpios[cs]; 728 bool alow = pinfo->alow_flags[cs]; 729 730 gpio_set_value(gpio, on ^ alow); 731 } else { 732 if (WARN_ON_ONCE(cs > pinfo->ngpios || !pinfo->immr_spi_cs)) 733 return; 734 iowrite32be(on ? SPI_BOOT_SEL_BIT : 0, pinfo->immr_spi_cs); 735 } 736 } 737 738 static int of_fsl_spi_get_chipselects(struct device *dev) 739 { 740 struct device_node *np = dev->of_node; 741 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); 742 struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata); 743 bool spisel_boot = IS_ENABLED(CONFIG_FSL_SOC) && 744 of_property_read_bool(np, "fsl,spisel_boot"); 745 int ngpios; 746 int i = 0; 747 int ret; 748 749 ngpios = of_gpio_count(np); 750 ngpios = max(ngpios, 0); 751 if (ngpios == 0 && !spisel_boot) { 752 /* 753 * SPI w/o chip-select line. One SPI device is still permitted 754 * though. 755 */ 756 pdata->max_chipselect = 1; 757 return 0; 758 } 759 760 pinfo->ngpios = ngpios; 761 pinfo->gpios = kmalloc_array(ngpios, sizeof(*pinfo->gpios), 762 GFP_KERNEL); 763 if (!pinfo->gpios) 764 return -ENOMEM; 765 memset(pinfo->gpios, -1, ngpios * sizeof(*pinfo->gpios)); 766 767 pinfo->alow_flags = kcalloc(ngpios, sizeof(*pinfo->alow_flags), 768 GFP_KERNEL); 769 if (!pinfo->alow_flags) { 770 ret = -ENOMEM; 771 goto err_alloc_flags; 772 } 773 774 for (; i < ngpios; i++) { 775 int gpio; 776 enum of_gpio_flags flags; 777 778 gpio = of_get_gpio_flags(np, i, &flags); 779 if (!gpio_is_valid(gpio)) { 780 dev_err(dev, "invalid gpio #%d: %d\n", i, gpio); 781 ret = gpio; 782 goto err_loop; 783 } 784 785 ret = gpio_request(gpio, dev_name(dev)); 786 if (ret) { 787 dev_err(dev, "can't request gpio #%d: %d\n", i, ret); 788 goto err_loop; 789 } 790 791 pinfo->gpios[i] = gpio; 792 pinfo->alow_flags[i] = flags & OF_GPIO_ACTIVE_LOW; 793 794 ret = gpio_direction_output(pinfo->gpios[i], 795 pinfo->alow_flags[i]); 796 if (ret) { 797 dev_err(dev, 798 "can't set output direction for gpio #%d: %d\n", 799 i, ret); 800 goto err_loop; 801 } 802 } 803 804 #if IS_ENABLED(CONFIG_FSL_SOC) 805 if (spisel_boot) { 806 pinfo->immr_spi_cs = ioremap(get_immrbase() + IMMR_SPI_CS_OFFSET, 4); 807 if (!pinfo->immr_spi_cs) { 808 ret = -ENOMEM; 809 i = ngpios - 1; 810 goto err_loop; 811 } 812 } 813 #endif 814 815 pdata->max_chipselect = ngpios + spisel_boot; 816 pdata->cs_control = fsl_spi_cs_control; 817 818 return 0; 819 820 err_loop: 821 while (i >= 0) { 822 if (gpio_is_valid(pinfo->gpios[i])) 823 gpio_free(pinfo->gpios[i]); 824 i--; 825 } 826 827 kfree(pinfo->alow_flags); 828 pinfo->alow_flags = NULL; 829 err_alloc_flags: 830 kfree(pinfo->gpios); 831 pinfo->gpios = NULL; 832 return ret; 833 } 834 835 static int of_fsl_spi_free_chipselects(struct device *dev) 836 { 837 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); 838 struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata); 839 int i; 840 841 if (!pinfo->gpios) 842 return 0; 843 844 for (i = 0; i < pdata->max_chipselect; i++) { 845 if (gpio_is_valid(pinfo->gpios[i])) 846 gpio_free(pinfo->gpios[i]); 847 } 848 849 kfree(pinfo->gpios); 850 kfree(pinfo->alow_flags); 851 return 0; 852 } 853 854 static int of_fsl_spi_probe(struct platform_device *ofdev) 855 { 856 struct device *dev = &ofdev->dev; 857 struct device_node *np = ofdev->dev.of_node; 858 struct spi_master *master; 859 struct resource mem; 860 int irq = 0, type; 861 int ret = -ENOMEM; 862 863 ret = of_mpc8xxx_spi_probe(ofdev); 864 if (ret) 865 return ret; 866 867 type = fsl_spi_get_type(&ofdev->dev); 868 if (type == TYPE_FSL) { 869 ret = of_fsl_spi_get_chipselects(dev); 870 if (ret) 871 goto err; 872 } 873 874 ret = of_address_to_resource(np, 0, &mem); 875 if (ret) 876 goto err; 877 878 irq = irq_of_parse_and_map(np, 0); 879 if (!irq) { 880 ret = -EINVAL; 881 goto err; 882 } 883 884 master = fsl_spi_probe(dev, &mem, irq); 885 if (IS_ERR(master)) { 886 ret = PTR_ERR(master); 887 goto err; 888 } 889 890 return 0; 891 892 err: 893 irq_dispose_mapping(irq); 894 if (type == TYPE_FSL) 895 of_fsl_spi_free_chipselects(dev); 896 return ret; 897 } 898 899 static int of_fsl_spi_remove(struct platform_device *ofdev) 900 { 901 struct spi_master *master = platform_get_drvdata(ofdev); 902 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master); 903 904 fsl_spi_cpm_free(mpc8xxx_spi); 905 if (mpc8xxx_spi->type == TYPE_FSL) 906 of_fsl_spi_free_chipselects(&ofdev->dev); 907 return 0; 908 } 909 910 static struct platform_driver of_fsl_spi_driver = { 911 .driver = { 912 .name = "fsl_spi", 913 .of_match_table = of_fsl_spi_match, 914 }, 915 .probe = of_fsl_spi_probe, 916 .remove = of_fsl_spi_remove, 917 }; 918 919 #ifdef CONFIG_MPC832x_RDB 920 /* 921 * XXX XXX XXX 922 * This is "legacy" platform driver, was used by the MPC8323E-RDB boards 923 * only. The driver should go away soon, since newer MPC8323E-RDB's device 924 * tree can work with OpenFirmware driver. But for now we support old trees 925 * as well. 926 */ 927 static int plat_mpc8xxx_spi_probe(struct platform_device *pdev) 928 { 929 struct resource *mem; 930 int irq; 931 struct spi_master *master; 932 933 if (!dev_get_platdata(&pdev->dev)) 934 return -EINVAL; 935 936 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 937 if (!mem) 938 return -EINVAL; 939 940 irq = platform_get_irq(pdev, 0); 941 if (irq <= 0) 942 return -EINVAL; 943 944 master = fsl_spi_probe(&pdev->dev, mem, irq); 945 return PTR_ERR_OR_ZERO(master); 946 } 947 948 static int plat_mpc8xxx_spi_remove(struct platform_device *pdev) 949 { 950 struct spi_master *master = platform_get_drvdata(pdev); 951 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master); 952 953 fsl_spi_cpm_free(mpc8xxx_spi); 954 955 return 0; 956 } 957 958 MODULE_ALIAS("platform:mpc8xxx_spi"); 959 static struct platform_driver mpc8xxx_spi_driver = { 960 .probe = plat_mpc8xxx_spi_probe, 961 .remove = plat_mpc8xxx_spi_remove, 962 .driver = { 963 .name = "mpc8xxx_spi", 964 }, 965 }; 966 967 static bool legacy_driver_failed; 968 969 static void __init legacy_driver_register(void) 970 { 971 legacy_driver_failed = platform_driver_register(&mpc8xxx_spi_driver); 972 } 973 974 static void __exit legacy_driver_unregister(void) 975 { 976 if (legacy_driver_failed) 977 return; 978 platform_driver_unregister(&mpc8xxx_spi_driver); 979 } 980 #else 981 static void __init legacy_driver_register(void) {} 982 static void __exit legacy_driver_unregister(void) {} 983 #endif /* CONFIG_MPC832x_RDB */ 984 985 static int __init fsl_spi_init(void) 986 { 987 legacy_driver_register(); 988 return platform_driver_register(&of_fsl_spi_driver); 989 } 990 module_init(fsl_spi_init); 991 992 static void __exit fsl_spi_exit(void) 993 { 994 platform_driver_unregister(&of_fsl_spi_driver); 995 legacy_driver_unregister(); 996 } 997 module_exit(fsl_spi_exit); 998 999 MODULE_AUTHOR("Kumar Gala"); 1000 MODULE_DESCRIPTION("Simple Freescale SPI Driver"); 1001 MODULE_LICENSE("GPL"); 1002