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 <[email protected]>
  13  *
  14  * GRLIB support:
  15  * Copyright (c) 2012 Aeroflex Gaisler AB.
  16  * Author: Andreas Larsson <[email protected]>
  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 __iomem *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_qe_cpu_set_shifts(u32 *rx_shift, u32 *tx_shift,
 115                                       int bits_per_word, int msb_first)
 116 {
 117         *rx_shift = 0;
 118         *tx_shift = 0;
 119         if (msb_first) {
 120                 if (bits_per_word <= 8) {
 121                         *rx_shift = 16;
 122                         *tx_shift = 24;
 123                 } else if (bits_per_word <= 16) {
 124                         *rx_shift = 16;
 125                         *tx_shift = 16;
 126                 }
 127         } else {
 128                 if (bits_per_word <= 8)
 129                         *rx_shift = 8;
 130         }
 131 }
 132
 133 static void fsl_spi_grlib_set_shifts(u32 *rx_shift, u32 *tx_shift,
 134                                      int bits_per_word, int msb_first)
 135 {
 136         *rx_shift = 0;
 137         *tx_shift = 0;
 138         if (bits_per_word <= 16) {
 139                 if (msb_first) {
 140                         *rx_shift = 16; /* LSB in bit 16 */
 141                         *tx_shift = 32 - bits_per_word; /* MSB in bit 31 */
 142                 } else {
 143                         *rx_shift = 16 - bits_per_word; /* MSB in bit 15 */
 144                 }
 145         }
 146 }
 147
 148 static int mspi_apply_cpu_mode_quirks(struct spi_mpc8xxx_cs *cs,
 149                                 struct spi_device *spi,
 150                                 struct mpc8xxx_spi *mpc8xxx_spi,
 151                                 int bits_per_word)
 152 {
 153         cs->rx_shift = 0;
 154         cs->tx_shift = 0;
 155         if (bits_per_word <= 8) {
 156                 cs->get_rx = mpc8xxx_spi_rx_buf_u8;
 157                 cs->get_tx = mpc8xxx_spi_tx_buf_u8;
 158         } else if (bits_per_word <= 16) {
 159                 cs->get_rx = mpc8xxx_spi_rx_buf_u16;
 160                 cs->get_tx = mpc8xxx_spi_tx_buf_u16;
 161         } else if (bits_per_word <= 32) {
 162                 cs->get_rx = mpc8xxx_spi_rx_buf_u32;
 163                 cs->get_tx = mpc8xxx_spi_tx_buf_u32;
 164         } else
 165                 return -EINVAL;
 166
 167         if (mpc8xxx_spi->set_shifts)
 168                 mpc8xxx_spi->set_shifts(&cs->rx_shift, &cs->tx_shift,
 169                                         bits_per_word,
 170                                         !(spi->mode & SPI_LSB_FIRST));
 171
 172         mpc8xxx_spi->rx_shift = cs->rx_shift;
 173         mpc8xxx_spi->tx_shift = cs->tx_shift;
 174         mpc8xxx_spi->get_rx = cs->get_rx;
 175         mpc8xxx_spi->get_tx = cs->get_tx;
 176
 177         return bits_per_word;
 178 }
 179
 180 static int mspi_apply_qe_mode_quirks(struct spi_mpc8xxx_cs *cs,
 181                                 struct spi_device *spi,
 182                                 int bits_per_word)
 183 {
 184         /* QE uses Little Endian for words > 8
 185          * so transform all words > 8 into 8 bits
 186          * Unfortnatly that doesn't work for LSB so
 187          * reject these for now */
 188         /* Note: 32 bits word, LSB works iff
 189          * tfcr/rfcr is set to CPMFCR_GBL */
 190         if (spi->mode & SPI_LSB_FIRST &&
 191             bits_per_word > 8)
 192                 return -EINVAL;
 193         if (bits_per_word > 8)
 194                 return 8; /* pretend its 8 bits */
 195         return bits_per_word;
 196 }
 197
 198 static int fsl_spi_setup_transfer(struct spi_device *spi,
 199                                         struct spi_transfer *t)
 200 {
 201         struct mpc8xxx_spi *mpc8xxx_spi;
 202         int bits_per_word = 0;
 203         u8 pm;
 204         u32 hz = 0;
 205         struct spi_mpc8xxx_cs   *cs = spi->controller_state;
 206
 207         mpc8xxx_spi = spi_master_get_devdata(spi->master);
 208
 209         if (t) {
 210                 bits_per_word = t->bits_per_word;
 211                 hz = t->speed_hz;
 212         }
 213
 214         /* spi_transfer level calls that work per-word */
 215         if (!bits_per_word)
 216                 bits_per_word = spi->bits_per_word;
 217
 218         if (!hz)
 219                 hz = spi->max_speed_hz;
 220
 221         if (!(mpc8xxx_spi->flags & SPI_CPM_MODE))
 222                 bits_per_word = mspi_apply_cpu_mode_quirks(cs, spi,
 223                                                            mpc8xxx_spi,
 224                                                            bits_per_word);
 225         else if (mpc8xxx_spi->flags & SPI_QE)
 226                 bits_per_word = mspi_apply_qe_mode_quirks(cs, spi,
 227                                                           bits_per_word);
 228
 229         if (bits_per_word < 0)
 230                 return bits_per_word;
 231
 232         if (bits_per_word == 32)
 233                 bits_per_word = 0;
 234         else
 235                 bits_per_word = bits_per_word - 1;
 236
 237         /* mask out bits we are going to set */
 238         cs->hw_mode &= ~(SPMODE_LEN(0xF) | SPMODE_DIV16
 239                                   | SPMODE_PM(0xF));
 240
 241         cs->hw_mode |= SPMODE_LEN(bits_per_word);
 242
 243         if ((mpc8xxx_spi->spibrg / hz) > 64) {
 244                 cs->hw_mode |= SPMODE_DIV16;
 245                 pm = (mpc8xxx_spi->spibrg - 1) / (hz * 64) + 1;
 246                 WARN_ONCE(pm > 16,
 247                           "%s: Requested speed is too low: %d Hz. Will use %d Hz instead.\n",
 248                           dev_name(&spi->dev), hz, mpc8xxx_spi->spibrg / 1024);
 249                 if (pm > 16)
 250                         pm = 16;
 251         } else {
 252                 pm = (mpc8xxx_spi->spibrg - 1) / (hz * 4) + 1;
 253         }
 254         if (pm)
 255                 pm--;
 256
 257         cs->hw_mode |= SPMODE_PM(pm);
 258
 259         fsl_spi_change_mode(spi);
 260         return 0;
 261 }
 262
 263 static int fsl_spi_cpu_bufs(struct mpc8xxx_spi *mspi,
 264                                 struct spi_transfer *t, unsigned int len)
 265 {
 266         u32 word;
 267         struct fsl_spi_reg __iomem *reg_base = mspi->reg_base;
 268
 269         mspi->count = len;
 270
 271         /* enable rx ints */
 272         mpc8xxx_spi_write_reg(&reg_base->mask, SPIM_NE);
 273
 274         /* transmit word */
 275         word = mspi->get_tx(mspi);
 276         mpc8xxx_spi_write_reg(&reg_base->transmit, word);
 277
 278         return 0;
 279 }
 280
 281 static int fsl_spi_bufs(struct spi_device *spi, struct spi_transfer *t,
 282                             bool is_dma_mapped)
 283 {
 284         struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
 285         struct fsl_spi_reg __iomem *reg_base;
 286         unsigned int len = t->len;
 287         u8 bits_per_word;
 288         int ret;
 289
 290         reg_base = mpc8xxx_spi->reg_base;
 291         bits_per_word = spi->bits_per_word;
 292         if (t->bits_per_word)
 293                 bits_per_word = t->bits_per_word;
 294
 295         if (bits_per_word > 8) {
 296                 /* invalid length? */
 297                 if (len & 1)
 298                         return -EINVAL;
 299                 len /= 2;
 300         }
 301         if (bits_per_word > 16) {
 302                 /* invalid length? */
 303                 if (len & 1)
 304                         return -EINVAL;
 305                 len /= 2;
 306         }
 307
 308         mpc8xxx_spi->tx = t->tx_buf;
 309         mpc8xxx_spi->rx = t->rx_buf;
 310
 311         reinit_completion(&mpc8xxx_spi->done);
 312
 313         if (mpc8xxx_spi->flags & SPI_CPM_MODE)
 314                 ret = fsl_spi_cpm_bufs(mpc8xxx_spi, t, is_dma_mapped);
 315         else
 316                 ret = fsl_spi_cpu_bufs(mpc8xxx_spi, t, len);
 317         if (ret)
 318                 return ret;
 319
 320         wait_for_completion(&mpc8xxx_spi->done);
 321
 322         /* disable rx ints */
 323         mpc8xxx_spi_write_reg(&reg_base->mask, 0);
 324
 325         if (mpc8xxx_spi->flags & SPI_CPM_MODE)
 326                 fsl_spi_cpm_bufs_complete(mpc8xxx_spi);
 327
 328         return mpc8xxx_spi->count;
 329 }
 330
 331 static int fsl_spi_prepare_message(struct spi_controller *ctlr,
 332                                    struct spi_message *m)
 333 {
 334         struct mpc8xxx_spi *mpc8xxx_spi = spi_controller_get_devdata(ctlr);
 335         struct spi_transfer *t;
 336         struct spi_transfer *first;
 337
 338         first = list_first_entry(&m->transfers, struct spi_transfer,
 339                                  transfer_list);
 340
 341         /*
 342          * In CPU mode, optimize large byte transfers to use larger
 343          * bits_per_word values to reduce number of interrupts taken.
 344          *
 345          * Some glitches can appear on the SPI clock when the mode changes.
 346          * Check that there is no speed change during the transfer and set it up
 347          * now to change the mode without having a chip-select asserted.
 348          */
 349         list_for_each_entry(t, &m->transfers, transfer_list) {
 350                 if (t->speed_hz != first->speed_hz) {
 351                         dev_err(&m->spi->dev,
 352                                 "speed_hz cannot change during message.\n");
 353                         return -EINVAL;
 354                 }
 355                 if (!(mpc8xxx_spi->flags & SPI_CPM_MODE)) {
 356                         if (t->len < 256 || t->bits_per_word != 8)
 357                                 continue;
 358                         if ((t->len & 3) == 0)
 359                                 t->bits_per_word = 32;
 360                         else if ((t->len & 1) == 0)
 361                                 t->bits_per_word = 16;
 362                 }
 363         }
 364         return fsl_spi_setup_transfer(m->spi, first);
 365 }
 366
 367 static int fsl_spi_transfer_one(struct spi_controller *controller,
 368                                 struct spi_device *spi,
 369                                 struct spi_transfer *t)
 370 {
 371         int status;
 372
 373         status = fsl_spi_setup_transfer(spi, t);
 374         if (status < 0)
 375                 return status;
 376         if (t->len)
 377                 status = fsl_spi_bufs(spi, t, !!t->tx_dma || !!t->rx_dma);
 378         if (status > 0)
 379                 return -EMSGSIZE;
 380
 381         return status;
 382 }
 383
 384 static int fsl_spi_unprepare_message(struct spi_controller *controller,
 385                                      struct spi_message *msg)
 386 {
 387         return fsl_spi_setup_transfer(msg->spi, NULL);
 388 }
 389
 390 static int fsl_spi_setup(struct spi_device *spi)
 391 {
 392         struct mpc8xxx_spi *mpc8xxx_spi;
 393         struct fsl_spi_reg __iomem *reg_base;
 394         bool initial_setup = false;
 395         int retval;
 396         u32 hw_mode;
 397         struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi);
 398
 399         if (!spi->max_speed_hz)
 400                 return -EINVAL;
 401
 402         if (!cs) {
 403                 cs = kzalloc(sizeof(*cs), GFP_KERNEL);
 404                 if (!cs)
 405                         return -ENOMEM;
 406                 spi_set_ctldata(spi, cs);
 407                 initial_setup = true;
 408         }
 409         mpc8xxx_spi = spi_master_get_devdata(spi->master);
 410
 411         reg_base = mpc8xxx_spi->reg_base;
 412
 413         hw_mode = cs->hw_mode; /* Save original settings */
 414         cs->hw_mode = mpc8xxx_spi_read_reg(&reg_base->mode);
 415         /* mask out bits we are going to set */
 416         cs->hw_mode &= ~(SPMODE_CP_BEGIN_EDGECLK | SPMODE_CI_INACTIVEHIGH
 417                          | SPMODE_REV | SPMODE_LOOP);
 418
 419         if (spi->mode & SPI_CPHA)
 420                 cs->hw_mode |= SPMODE_CP_BEGIN_EDGECLK;
 421         if (spi->mode & SPI_CPOL)
 422                 cs->hw_mode |= SPMODE_CI_INACTIVEHIGH;
 423         if (!(spi->mode & SPI_LSB_FIRST))
 424                 cs->hw_mode |= SPMODE_REV;
 425         if (spi->mode & SPI_LOOP)
 426                 cs->hw_mode |= SPMODE_LOOP;
 427
 428         retval = fsl_spi_setup_transfer(spi, NULL);
 429         if (retval < 0) {
 430                 cs->hw_mode = hw_mode; /* Restore settings */
 431                 if (initial_setup)
 432                         kfree(cs);
 433                 return retval;
 434         }
 435
 436         return 0;
 437 }
 438
 439 static void fsl_spi_cleanup(struct spi_device *spi)
 440 {
 441         struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi);
 442
 443         kfree(cs);
 444         spi_set_ctldata(spi, NULL);
 445 }
 446
 447 static void fsl_spi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
 448 {
 449         struct fsl_spi_reg __iomem *reg_base = mspi->reg_base;
 450
 451         /* We need handle RX first */
 452         if (events & SPIE_NE) {
 453                 u32 rx_data = mpc8xxx_spi_read_reg(&reg_base->receive);
 454
 455                 if (mspi->rx)
 456                         mspi->get_rx(rx_data, mspi);
 457         }
 458
 459         if ((events & SPIE_NF) == 0)
 460                 /* spin until TX is done */
 461                 while (((events =
 462                         mpc8xxx_spi_read_reg(&reg_base->event)) &
 463                                                 SPIE_NF) == 0)
 464                         cpu_relax();
 465
 466         /* Clear the events */
 467         mpc8xxx_spi_write_reg(&reg_base->event, events);
 468
 469         mspi->count -= 1;
 470         if (mspi->count) {
 471                 u32 word = mspi->get_tx(mspi);
 472
 473                 mpc8xxx_spi_write_reg(&reg_base->transmit, word);
 474         } else {
 475                 complete(&mspi->done);
 476         }
 477 }
 478
 479 static irqreturn_t fsl_spi_irq(s32 irq, void *context_data)
 480 {
 481         struct mpc8xxx_spi *mspi = context_data;
 482         irqreturn_t ret = IRQ_NONE;
 483         u32 events;
 484         struct fsl_spi_reg __iomem *reg_base = mspi->reg_base;
 485
 486         /* Get interrupt events(tx/rx) */
 487         events = mpc8xxx_spi_read_reg(&reg_base->event);
 488         if (events)
 489                 ret = IRQ_HANDLED;
 490
 491         dev_dbg(mspi->dev, "%s: events %x\n", __func__, events);
 492
 493         if (mspi->flags & SPI_CPM_MODE)
 494                 fsl_spi_cpm_irq(mspi, events);
 495         else
 496                 fsl_spi_cpu_irq(mspi, events);
 497
 498         return ret;
 499 }
 500
 501 static void fsl_spi_grlib_cs_control(struct spi_device *spi, bool on)
 502 {
 503         struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
 504         struct fsl_spi_reg __iomem *reg_base = mpc8xxx_spi->reg_base;
 505         u32 slvsel;
 506         u16 cs = spi->chip_select;
 507
 508         if (cs < mpc8xxx_spi->native_chipselects) {
 509                 slvsel = mpc8xxx_spi_read_reg(&reg_base->slvsel);
 510                 slvsel = on ? (slvsel | (1 << cs)) : (slvsel & ~(1 << cs));
 511                 mpc8xxx_spi_write_reg(&reg_base->slvsel, slvsel);
 512         }
 513 }
 514
 515 static void fsl_spi_grlib_probe(struct device *dev)
 516 {
 517         struct spi_master *master = dev_get_drvdata(dev);
 518         struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
 519         struct fsl_spi_reg __iomem *reg_base = mpc8xxx_spi->reg_base;
 520         int mbits;
 521         u32 capabilities;
 522
 523         capabilities = mpc8xxx_spi_read_reg(&reg_base->cap);
 524
 525         mpc8xxx_spi->set_shifts = fsl_spi_grlib_set_shifts;
 526         mbits = SPCAP_MAXWLEN(capabilities);
 527         if (mbits)
 528                 mpc8xxx_spi->max_bits_per_word = mbits + 1;
 529
 530         mpc8xxx_spi->native_chipselects = 0;
 531         if (SPCAP_SSEN(capabilities)) {
 532                 mpc8xxx_spi->native_chipselects = SPCAP_SSSZ(capabilities);
 533                 mpc8xxx_spi_write_reg(&reg_base->slvsel, 0xffffffff);
 534         }
 535         master->num_chipselect = mpc8xxx_spi->native_chipselects;
 536         master->set_cs = fsl_spi_grlib_cs_control;
 537 }
 538
 539 static void fsl_spi_cs_control(struct spi_device *spi, bool on)
 540 {
 541         struct device *dev = spi->dev.parent->parent;
 542         struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
 543         struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata);
 544
 545         if (WARN_ON_ONCE(!pinfo->immr_spi_cs))
 546                 return;
 547         iowrite32be(on ? 0 : SPI_BOOT_SEL_BIT, pinfo->immr_spi_cs);
 548 }
 549
 550 static struct spi_master *fsl_spi_probe(struct device *dev,
 551                 struct resource *mem, unsigned int irq)
 552 {
 553         struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
 554         struct spi_master *master;
 555         struct mpc8xxx_spi *mpc8xxx_spi;
 556         struct fsl_spi_reg __iomem *reg_base;
 557         u32 regval;
 558         int ret = 0;
 559
 560         master = spi_alloc_master(dev, sizeof(struct mpc8xxx_spi));
 561         if (master == NULL) {
 562                 ret = -ENOMEM;
 563                 goto err;
 564         }
 565
 566         dev_set_drvdata(dev, master);
 567
 568         mpc8xxx_spi_probe(dev, mem, irq);
 569
 570         master->setup = fsl_spi_setup;
 571         master->cleanup = fsl_spi_cleanup;
 572         master->prepare_message = fsl_spi_prepare_message;
 573         master->transfer_one = fsl_spi_transfer_one;
 574         master->unprepare_message = fsl_spi_unprepare_message;
 575         master->use_gpio_descriptors = true;
 576         master->set_cs = fsl_spi_cs_control;
 577
 578         mpc8xxx_spi = spi_master_get_devdata(master);
 579         mpc8xxx_spi->max_bits_per_word = 32;
 580         mpc8xxx_spi->type = fsl_spi_get_type(dev);
 581
 582         ret = fsl_spi_cpm_init(mpc8xxx_spi);
 583         if (ret)
 584                 goto err_cpm_init;
 585
 586         mpc8xxx_spi->reg_base = devm_ioremap_resource(dev, mem);
 587         if (IS_ERR(mpc8xxx_spi->reg_base)) {
 588                 ret = PTR_ERR(mpc8xxx_spi->reg_base);
 589                 goto err_probe;
 590         }
 591
 592         if (mpc8xxx_spi->type == TYPE_GRLIB)
 593                 fsl_spi_grlib_probe(dev);
 594
 595         master->bits_per_word_mask =
 596                 (SPI_BPW_RANGE_MASK(4, 16) | SPI_BPW_MASK(32)) &
 597                 SPI_BPW_RANGE_MASK(1, mpc8xxx_spi->max_bits_per_word);
 598
 599         if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE)
 600                 mpc8xxx_spi->set_shifts = fsl_spi_qe_cpu_set_shifts;
 601
 602         if (mpc8xxx_spi->set_shifts)
 603                 /* 8 bits per word and MSB first */
 604                 mpc8xxx_spi->set_shifts(&mpc8xxx_spi->rx_shift,
 605                                         &mpc8xxx_spi->tx_shift, 8, 1);
 606
 607         /* Register for SPI Interrupt */
 608         ret = devm_request_irq(dev, mpc8xxx_spi->irq, fsl_spi_irq,
 609                                0, "fsl_spi", mpc8xxx_spi);
 610
 611         if (ret != 0)
 612                 goto err_probe;
 613
 614         reg_base = mpc8xxx_spi->reg_base;
 615
 616         /* SPI controller initializations */
 617         mpc8xxx_spi_write_reg(&reg_base->mode, 0);
 618         mpc8xxx_spi_write_reg(&reg_base->mask, 0);
 619         mpc8xxx_spi_write_reg(&reg_base->command, 0);
 620         mpc8xxx_spi_write_reg(&reg_base->event, 0xffffffff);
 621
 622         /* Enable SPI interface */
 623         regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE;
 624         if (mpc8xxx_spi->max_bits_per_word < 8) {
 625                 regval &= ~SPMODE_LEN(0xF);
 626                 regval |= SPMODE_LEN(mpc8xxx_spi->max_bits_per_word - 1);
 627         }
 628         if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE)
 629                 regval |= SPMODE_OP;
 630
 631         mpc8xxx_spi_write_reg(&reg_base->mode, regval);
 632
 633         ret = devm_spi_register_master(dev, master);
 634         if (ret < 0)
 635                 goto err_probe;
 636
 637         dev_info(dev, "at 0x%p (irq = %d), %s mode\n", reg_base,
 638                  mpc8xxx_spi->irq, mpc8xxx_spi_strmode(mpc8xxx_spi->flags));
 639
 640         return master;
 641
 642 err_probe:
 643         fsl_spi_cpm_free(mpc8xxx_spi);
 644 err_cpm_init:
 645         spi_master_put(master);
 646 err:
 647         return ERR_PTR(ret);
 648 }
 649
 650 static int of_fsl_spi_probe(struct platform_device *ofdev)
 651 {
 652         struct device *dev = &ofdev->dev;
 653         struct device_node *np = ofdev->dev.of_node;
 654         struct spi_master *master;
 655         struct resource mem;
 656         int irq, type;
 657         int ret;
 658         bool spisel_boot = false;
 659 #if IS_ENABLED(CONFIG_FSL_SOC)
 660         struct mpc8xxx_spi_probe_info *pinfo = NULL;
 661 #endif
 662
 663
 664         ret = of_mpc8xxx_spi_probe(ofdev);
 665         if (ret)
 666                 return ret;
 667
 668         type = fsl_spi_get_type(&ofdev->dev);
 669         if (type == TYPE_FSL) {
 670                 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
 671 #if IS_ENABLED(CONFIG_FSL_SOC)
 672                 pinfo = to_of_pinfo(pdata);
 673
 674                 spisel_boot = of_property_read_bool(np, "fsl,spisel_boot");
 675                 if (spisel_boot) {
 676                         pinfo->immr_spi_cs = ioremap(get_immrbase() + IMMR_SPI_CS_OFFSET, 4);
 677                         if (!pinfo->immr_spi_cs)
 678                                 return -ENOMEM;
 679                 }
 680 #endif
 681                 /*
 682                  * Handle the case where we have one hardwired (always selected)
 683                  * device on the first "chipselect". Else we let the core code
 684                  * handle any GPIOs or native chip selects and assign the
 685                  * appropriate callback for dealing with the CS lines. This isn't
 686                  * supported on the GRLIB variant.
 687                  */
 688                 ret = gpiod_count(dev, "cs");
 689                 if (ret < 0)
 690                         ret = 0;
 691                 if (ret == 0 && !spisel_boot)
 692                         pdata->max_chipselect = 1;
 693                 else
 694                         pdata->max_chipselect = ret + spisel_boot;
 695         }
 696
 697         ret = of_address_to_resource(np, 0, &mem);
 698         if (ret)
 699                 goto unmap_out;
 700
 701         irq = platform_get_irq(ofdev, 0);
 702         if (irq < 0) {
 703                 ret = irq;
 704                 goto unmap_out;
 705         }
 706
 707         master = fsl_spi_probe(dev, &mem, irq);
 708
 709         return PTR_ERR_OR_ZERO(master);
 710
 711 unmap_out:
 712 #if IS_ENABLED(CONFIG_FSL_SOC)
 713         if (spisel_boot)
 714                 iounmap(pinfo->immr_spi_cs);
 715 #endif
 716         return ret;
 717 }
 718
 719 static int of_fsl_spi_remove(struct platform_device *ofdev)
 720 {
 721         struct spi_master *master = platform_get_drvdata(ofdev);
 722         struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
 723
 724         fsl_spi_cpm_free(mpc8xxx_spi);
 725         return 0;
 726 }
 727
 728 static struct platform_driver of_fsl_spi_driver = {
 729         .driver = {
 730                 .name = "fsl_spi",
 731                 .of_match_table = of_fsl_spi_match,
 732         },
 733         .probe          = of_fsl_spi_probe,
 734         .remove         = of_fsl_spi_remove,
 735 };
 736
 737 #ifdef CONFIG_MPC832x_RDB
 738 /*
 739  * XXX XXX XXX
 740  * This is "legacy" platform driver, was used by the MPC8323E-RDB boards
 741  * only. The driver should go away soon, since newer MPC8323E-RDB's device
 742  * tree can work with OpenFirmware driver. But for now we support old trees
 743  * as well.
 744  */
 745 static int plat_mpc8xxx_spi_probe(struct platform_device *pdev)
 746 {
 747         struct resource *mem;
 748         int irq;
 749         struct spi_master *master;
 750
 751         if (!dev_get_platdata(&pdev->dev))
 752                 return -EINVAL;
 753
 754         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 755         if (!mem)
 756                 return -EINVAL;
 757
 758         irq = platform_get_irq(pdev, 0);
 759         if (irq <= 0)
 760                 return -EINVAL;
 761
 762         master = fsl_spi_probe(&pdev->dev, mem, irq);
 763         return PTR_ERR_OR_ZERO(master);
 764 }
 765
 766 static int plat_mpc8xxx_spi_remove(struct platform_device *pdev)
 767 {
 768         struct spi_master *master = platform_get_drvdata(pdev);
 769         struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
 770
 771         fsl_spi_cpm_free(mpc8xxx_spi);
 772
 773         return 0;
 774 }
 775
 776 MODULE_ALIAS("platform:mpc8xxx_spi");
 777 static struct platform_driver mpc8xxx_spi_driver = {
 778         .probe = plat_mpc8xxx_spi_probe,
 779         .remove = plat_mpc8xxx_spi_remove,
 780         .driver = {
 781                 .name = "mpc8xxx_spi",
 782         },
 783 };
 784
 785 static bool legacy_driver_failed;
 786
 787 static void __init legacy_driver_register(void)
 788 {
 789         legacy_driver_failed = platform_driver_register(&mpc8xxx_spi_driver);
 790 }
 791
 792 static void __exit legacy_driver_unregister(void)
 793 {
 794         if (legacy_driver_failed)
 795                 return;
 796         platform_driver_unregister(&mpc8xxx_spi_driver);
 797 }
 798 #else
 799 static void __init legacy_driver_register(void) {}
 800 static void __exit legacy_driver_unregister(void) {}
 801 #endif /* CONFIG_MPC832x_RDB */
 802
 803 static int __init fsl_spi_init(void)
 804 {
 805         legacy_driver_register();
 806         return platform_driver_register(&of_fsl_spi_driver);
 807 }
 808 module_init(fsl_spi_init);
 809
 810 static void __exit fsl_spi_exit(void)
 811 {
 812         platform_driver_unregister(&of_fsl_spi_driver);
 813         legacy_driver_unregister();
 814 }
 815 module_exit(fsl_spi_exit);
 816
 817 MODULE_AUTHOR("Kumar Gala");
 818 MODULE_DESCRIPTION("Simple Freescale SPI Driver");
 819 MODULE_LICENSE("GPL");