drivers/spi/spi-fsl-spi.c

   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 = &reg_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(&reg_base->mask, SPIM_NE);
 300
 301         /* transmit word */
 302         word = mspi->get_tx(mspi);
 303         mpc8xxx_spi_write_reg(&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(&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(&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(&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(&reg_base->event)) &
 512                                                 SPIE_NF) == 0)
 513                         cpu_relax();
 514
 515         /* Clear the events */
 516         mpc8xxx_spi_write_reg(&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(&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(&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(&reg_base->slvsel);
 561                 slvsel = on ? (slvsel | (1 << cs)) : (slvsel & ~(1 << cs));
 562                 mpc8xxx_spi_write_reg(&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(&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(&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(&reg_base->mode, 0);
 656         mpc8xxx_spi_write_reg(&reg_base->mask, 0);
 657         mpc8xxx_spi_write_reg(&reg_base->command, 0);
 658         mpc8xxx_spi_write_reg(&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(&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, type;
 710         int ret;
 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                                 return -ENOMEM;
 727                 }
 728 #endif
 729                 /*
 730                  * Handle the case where we have one hardwired (always selected)
 731                  * device on the first "chipselect". Else we let the core code
 732                  * handle any GPIOs or native chip selects and assign the
 733                  * appropriate callback for dealing with the CS lines. This isn't
 734                  * supported on the GRLIB variant.
 735                  */
 736                 ret = gpiod_count(dev, "cs");
 737                 if (ret <= 0)
 738                         pdata->max_chipselect = 1;
 739                 else
 740                         pdata->cs_control = fsl_spi_cs_control;
 741         }
 742
 743         ret = of_address_to_resource(np, 0, &mem);
 744         if (ret)
 745                 return ret;
 746
 747         irq = platform_get_irq(ofdev, 0);
 748         if (irq < 0)
 749                 return irq;
 750
 751         master = fsl_spi_probe(dev, &mem, irq);
 752
 753         return PTR_ERR_OR_ZERO(master);
 754 }
 755
 756 static int of_fsl_spi_remove(struct platform_device *ofdev)
 757 {
 758         struct spi_master *master = platform_get_drvdata(ofdev);
 759         struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
 760
 761         fsl_spi_cpm_free(mpc8xxx_spi);
 762         return 0;
 763 }
 764
 765 static struct platform_driver of_fsl_spi_driver = {
 766         .driver = {
 767                 .name = "fsl_spi",
 768                 .of_match_table = of_fsl_spi_match,
 769         },
 770         .probe          = of_fsl_spi_probe,
 771         .remove         = of_fsl_spi_remove,
 772 };
 773
 774 #ifdef CONFIG_MPC832x_RDB
 775 /*
 776  * XXX XXX XXX
 777  * This is "legacy" platform driver, was used by the MPC8323E-RDB boards
 778  * only. The driver should go away soon, since newer MPC8323E-RDB's device
 779  * tree can work with OpenFirmware driver. But for now we support old trees
 780  * as well.
 781  */
 782 static int plat_mpc8xxx_spi_probe(struct platform_device *pdev)
 783 {
 784         struct resource *mem;
 785         int irq;
 786         struct spi_master *master;
 787
 788         if (!dev_get_platdata(&pdev->dev))
 789                 return -EINVAL;
 790
 791         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 792         if (!mem)
 793                 return -EINVAL;
 794
 795         irq = platform_get_irq(pdev, 0);
 796         if (irq <= 0)
 797                 return -EINVAL;
 798
 799         master = fsl_spi_probe(&pdev->dev, mem, irq);
 800         return PTR_ERR_OR_ZERO(master);
 801 }
 802
 803 static int plat_mpc8xxx_spi_remove(struct platform_device *pdev)
 804 {
 805         struct spi_master *master = platform_get_drvdata(pdev);
 806         struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
 807
 808         fsl_spi_cpm_free(mpc8xxx_spi);
 809
 810         return 0;
 811 }
 812
 813 MODULE_ALIAS("platform:mpc8xxx_spi");
 814 static struct platform_driver mpc8xxx_spi_driver = {
 815         .probe = plat_mpc8xxx_spi_probe,
 816         .remove = plat_mpc8xxx_spi_remove,
 817         .driver = {
 818                 .name = "mpc8xxx_spi",
 819         },
 820 };
 821
 822 static bool legacy_driver_failed;
 823
 824 static void __init legacy_driver_register(void)
 825 {
 826         legacy_driver_failed = platform_driver_register(&mpc8xxx_spi_driver);
 827 }
 828
 829 static void __exit legacy_driver_unregister(void)
 830 {
 831         if (legacy_driver_failed)
 832                 return;
 833         platform_driver_unregister(&mpc8xxx_spi_driver);
 834 }
 835 #else
 836 static void __init legacy_driver_register(void) {}
 837 static void __exit legacy_driver_unregister(void) {}
 838 #endif /* CONFIG_MPC832x_RDB */
 839
 840 static int __init fsl_spi_init(void)
 841 {
 842         legacy_driver_register();
 843         return platform_driver_register(&of_fsl_spi_driver);
 844 }
 845 module_init(fsl_spi_init);
 846
 847 static void __exit fsl_spi_exit(void)
 848 {
 849         platform_driver_unregister(&of_fsl_spi_driver);
 850         legacy_driver_unregister();
 851 }
 852 module_exit(fsl_spi_exit);
 853
 854 MODULE_AUTHOR("Kumar Gala");
 855 MODULE_DESCRIPTION("Simple Freescale SPI Driver");
 856 MODULE_LICENSE("GPL");