drivers/spi/spi-bcm63xx.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Broadcom BCM63xx SPI controller support
   4  *
   5  * Copyright (C) 2009-2012 Florian Fainelli <florian@openwrt.org>
   6  * Copyright (C) 2010 Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/clk.h>
  11 #include <linux/io.h>
  12 #include <linux/module.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/delay.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/spi/spi.h>
  17 #include <linux/completion.h>
  18 #include <linux/err.h>
  19 #include <linux/pm_runtime.h>
  20 #include <linux/of.h>
  21 #include <linux/reset.h>
  22
  23 /* BCM 6338/6348 SPI core */
  24 #define SPI_6348_RSET_SIZE              64
  25 #define SPI_6348_CMD                    0x00    /* 16-bits register */
  26 #define SPI_6348_INT_STATUS             0x02
  27 #define SPI_6348_INT_MASK_ST            0x03
  28 #define SPI_6348_INT_MASK               0x04
  29 #define SPI_6348_ST                     0x05
  30 #define SPI_6348_CLK_CFG                0x06
  31 #define SPI_6348_FILL_BYTE              0x07
  32 #define SPI_6348_MSG_TAIL               0x09
  33 #define SPI_6348_RX_TAIL                0x0b
  34 #define SPI_6348_MSG_CTL                0x40    /* 8-bits register */
  35 #define SPI_6348_MSG_CTL_WIDTH          8
  36 #define SPI_6348_MSG_DATA               0x41
  37 #define SPI_6348_MSG_DATA_SIZE          0x3f
  38 #define SPI_6348_RX_DATA                0x80
  39 #define SPI_6348_RX_DATA_SIZE           0x3f
  40
  41 /* BCM 3368/6358/6262/6368 SPI core */
  42 #define SPI_6358_RSET_SIZE              1804
  43 #define SPI_6358_MSG_CTL                0x00    /* 16-bits register */
  44 #define SPI_6358_MSG_CTL_WIDTH          16
  45 #define SPI_6358_MSG_DATA               0x02
  46 #define SPI_6358_MSG_DATA_SIZE          0x21e
  47 #define SPI_6358_RX_DATA                0x400
  48 #define SPI_6358_RX_DATA_SIZE           0x220
  49 #define SPI_6358_CMD                    0x700   /* 16-bits register */
  50 #define SPI_6358_INT_STATUS             0x702
  51 #define SPI_6358_INT_MASK_ST            0x703
  52 #define SPI_6358_INT_MASK               0x704
  53 #define SPI_6358_ST                     0x705
  54 #define SPI_6358_CLK_CFG                0x706
  55 #define SPI_6358_FILL_BYTE              0x707
  56 #define SPI_6358_MSG_TAIL               0x709
  57 #define SPI_6358_RX_TAIL                0x70B
  58
  59 /* Shared SPI definitions */
  60
  61 /* Message configuration */
  62 #define SPI_FD_RW                       0x00
  63 #define SPI_HD_W                        0x01
  64 #define SPI_HD_R                        0x02
  65 #define SPI_BYTE_CNT_SHIFT              0
  66 #define SPI_6348_MSG_TYPE_SHIFT         6
  67 #define SPI_6358_MSG_TYPE_SHIFT         14
  68
  69 /* Command */
  70 #define SPI_CMD_NOOP                    0x00
  71 #define SPI_CMD_SOFT_RESET              0x01
  72 #define SPI_CMD_HARD_RESET              0x02
  73 #define SPI_CMD_START_IMMEDIATE         0x03
  74 #define SPI_CMD_COMMAND_SHIFT           0
  75 #define SPI_CMD_COMMAND_MASK            0x000f
  76 #define SPI_CMD_DEVICE_ID_SHIFT         4
  77 #define SPI_CMD_PREPEND_BYTE_CNT_SHIFT  8
  78 #define SPI_CMD_ONE_BYTE_SHIFT          11
  79 #define SPI_CMD_ONE_WIRE_SHIFT          12
  80 #define SPI_DEV_ID_0                    0
  81 #define SPI_DEV_ID_1                    1
  82 #define SPI_DEV_ID_2                    2
  83 #define SPI_DEV_ID_3                    3
  84
  85 /* Interrupt mask */
  86 #define SPI_INTR_CMD_DONE               0x01
  87 #define SPI_INTR_RX_OVERFLOW            0x02
  88 #define SPI_INTR_TX_UNDERFLOW           0x04
  89 #define SPI_INTR_TX_OVERFLOW            0x08
  90 #define SPI_INTR_RX_UNDERFLOW           0x10
  91 #define SPI_INTR_CLEAR_ALL              0x1f
  92
  93 /* Status */
  94 #define SPI_RX_EMPTY                    0x02
  95 #define SPI_CMD_BUSY                    0x04
  96 #define SPI_SERIAL_BUSY                 0x08
  97
  98 /* Clock configuration */
  99 #define SPI_CLK_20MHZ                   0x00
 100 #define SPI_CLK_0_391MHZ                0x01
 101 #define SPI_CLK_0_781MHZ                0x02    /* default */
 102 #define SPI_CLK_1_563MHZ                0x03
 103 #define SPI_CLK_3_125MHZ                0x04
 104 #define SPI_CLK_6_250MHZ                0x05
 105 #define SPI_CLK_12_50MHZ                0x06
 106 #define SPI_CLK_MASK                    0x07
 107 #define SPI_SSOFFTIME_MASK              0x38
 108 #define SPI_SSOFFTIME_SHIFT             3
 109 #define SPI_BYTE_SWAP                   0x80
 110
 111 enum bcm63xx_regs_spi {
 112         SPI_CMD,
 113         SPI_INT_STATUS,
 114         SPI_INT_MASK_ST,
 115         SPI_INT_MASK,
 116         SPI_ST,
 117         SPI_CLK_CFG,
 118         SPI_FILL_BYTE,
 119         SPI_MSG_TAIL,
 120         SPI_RX_TAIL,
 121         SPI_MSG_CTL,
 122         SPI_MSG_DATA,
 123         SPI_RX_DATA,
 124         SPI_MSG_TYPE_SHIFT,
 125         SPI_MSG_CTL_WIDTH,
 126         SPI_MSG_DATA_SIZE,
 127 };
 128
 129 #define BCM63XX_SPI_MAX_PREPEND         7
 130
 131 #define BCM63XX_SPI_MAX_CS              8
 132 #define BCM63XX_SPI_BUS_NUM             0
 133
 134 struct bcm63xx_spi {
 135         struct completion       done;
 136
 137         void __iomem            *regs;
 138         int                     irq;
 139
 140         /* Platform data */
 141         const unsigned long     *reg_offsets;
 142         unsigned int            fifo_size;
 143         unsigned int            msg_type_shift;
 144         unsigned int            msg_ctl_width;
 145
 146         /* data iomem */
 147         u8 __iomem              *tx_io;
 148         const u8 __iomem        *rx_io;
 149
 150         struct clk              *clk;
 151         struct platform_device  *pdev;
 152 };
 153
 154 static inline u8 bcm_spi_readb(struct bcm63xx_spi *bs,
 155                                unsigned int offset)
 156 {
 157         return readb(bs->regs + bs->reg_offsets[offset]);
 158 }
 159
 160 static inline void bcm_spi_writeb(struct bcm63xx_spi *bs,
 161                                   u8 value, unsigned int offset)
 162 {
 163         writeb(value, bs->regs + bs->reg_offsets[offset]);
 164 }
 165
 166 static inline void bcm_spi_writew(struct bcm63xx_spi *bs,
 167                                   u16 value, unsigned int offset)
 168 {
 169 #ifdef CONFIG_CPU_BIG_ENDIAN
 170         iowrite16be(value, bs->regs + bs->reg_offsets[offset]);
 171 #else
 172         writew(value, bs->regs + bs->reg_offsets[offset]);
 173 #endif
 174 }
 175
 176 static const unsigned int bcm63xx_spi_freq_table[SPI_CLK_MASK][2] = {
 177         { 20000000, SPI_CLK_20MHZ },
 178         { 12500000, SPI_CLK_12_50MHZ },
 179         {  6250000, SPI_CLK_6_250MHZ },
 180         {  3125000, SPI_CLK_3_125MHZ },
 181         {  1563000, SPI_CLK_1_563MHZ },
 182         {   781000, SPI_CLK_0_781MHZ },
 183         {   391000, SPI_CLK_0_391MHZ }
 184 };
 185
 186 static void bcm63xx_spi_setup_transfer(struct spi_device *spi,
 187                                       struct spi_transfer *t)
 188 {
 189         struct bcm63xx_spi *bs = spi_controller_get_devdata(spi->controller);
 190         u8 clk_cfg, reg;
 191         int i;
 192
 193         /* Default to lowest clock configuration */
 194         clk_cfg = SPI_CLK_0_391MHZ;
 195
 196         /* Find the closest clock configuration */
 197         for (i = 0; i < SPI_CLK_MASK; i++) {
 198                 if (t->speed_hz >= bcm63xx_spi_freq_table[i][0]) {
 199                         clk_cfg = bcm63xx_spi_freq_table[i][1];
 200                         break;
 201                 }
 202         }
 203
 204         /* clear existing clock configuration bits of the register */
 205         reg = bcm_spi_readb(bs, SPI_CLK_CFG);
 206         reg &= ~SPI_CLK_MASK;
 207         reg |= clk_cfg;
 208
 209         bcm_spi_writeb(bs, reg, SPI_CLK_CFG);
 210         dev_dbg(&spi->dev, "Setting clock register to %02x (hz %d)\n",
 211                 clk_cfg, t->speed_hz);
 212 }
 213
 214 /* the spi->mode bits understood by this driver: */
 215 #define MODEBITS (SPI_CPOL | SPI_CPHA)
 216
 217 static int bcm63xx_txrx_bufs(struct spi_device *spi, struct spi_transfer *first,
 218                                 unsigned int num_transfers)
 219 {
 220         struct bcm63xx_spi *bs = spi_controller_get_devdata(spi->controller);
 221         u16 msg_ctl;
 222         u16 cmd;
 223         unsigned int i, timeout = 0, prepend_len = 0, len = 0;
 224         struct spi_transfer *t = first;
 225         bool do_rx = false;
 226         bool do_tx = false;
 227
 228         /* Disable the CMD_DONE interrupt */
 229         bcm_spi_writeb(bs, 0, SPI_INT_MASK);
 230
 231         dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n",
 232                 t->tx_buf, t->rx_buf, t->len);
 233
 234         if (num_transfers > 1 && t->tx_buf && t->len <= BCM63XX_SPI_MAX_PREPEND)
 235                 prepend_len = t->len;
 236
 237         /* prepare the buffer */
 238         for (i = 0; i < num_transfers; i++) {
 239                 if (t->tx_buf) {
 240                         do_tx = true;
 241                         memcpy_toio(bs->tx_io + len, t->tx_buf, t->len);
 242
 243                         /* don't prepend more than one tx */
 244                         if (t != first)
 245                                 prepend_len = 0;
 246                 }
 247
 248                 if (t->rx_buf) {
 249                         do_rx = true;
 250                         /* prepend is half-duplex write only */
 251                         if (t == first)
 252                                 prepend_len = 0;
 253                 }
 254
 255                 len += t->len;
 256
 257                 t = list_entry(t->transfer_list.next, struct spi_transfer,
 258                                transfer_list);
 259         }
 260
 261         reinit_completion(&bs->done);
 262
 263         /* Fill in the Message control register */
 264         msg_ctl = (len << SPI_BYTE_CNT_SHIFT);
 265
 266         if (do_rx && do_tx && prepend_len == 0)
 267                 msg_ctl |= (SPI_FD_RW << bs->msg_type_shift);
 268         else if (do_rx)
 269                 msg_ctl |= (SPI_HD_R << bs->msg_type_shift);
 270         else if (do_tx)
 271                 msg_ctl |= (SPI_HD_W << bs->msg_type_shift);
 272
 273         switch (bs->msg_ctl_width) {
 274         case 8:
 275                 bcm_spi_writeb(bs, msg_ctl, SPI_MSG_CTL);
 276                 break;
 277         case 16:
 278                 bcm_spi_writew(bs, msg_ctl, SPI_MSG_CTL);
 279                 break;
 280         }
 281
 282         /* Issue the transfer */
 283         cmd = SPI_CMD_START_IMMEDIATE;
 284         cmd |= (prepend_len << SPI_CMD_PREPEND_BYTE_CNT_SHIFT);
 285         cmd |= (spi_get_chipselect(spi, 0) << SPI_CMD_DEVICE_ID_SHIFT);
 286         bcm_spi_writew(bs, cmd, SPI_CMD);
 287
 288         /* Enable the CMD_DONE interrupt */
 289         bcm_spi_writeb(bs, SPI_INTR_CMD_DONE, SPI_INT_MASK);
 290
 291         timeout = wait_for_completion_timeout(&bs->done, HZ);
 292         if (!timeout)
 293                 return -ETIMEDOUT;
 294
 295         if (!do_rx)
 296                 return 0;
 297
 298         len = 0;
 299         t = first;
 300         /* Read out all the data */
 301         for (i = 0; i < num_transfers; i++) {
 302                 if (t->rx_buf)
 303                         memcpy_fromio(t->rx_buf, bs->rx_io + len, t->len);
 304
 305                 if (t != first || prepend_len == 0)
 306                         len += t->len;
 307
 308                 t = list_entry(t->transfer_list.next, struct spi_transfer,
 309                                transfer_list);
 310         }
 311
 312         return 0;
 313 }
 314
 315 static int bcm63xx_spi_transfer_one(struct spi_controller *host,
 316                                         struct spi_message *m)
 317 {
 318         struct bcm63xx_spi *bs = spi_controller_get_devdata(host);
 319         struct spi_transfer *t, *first = NULL;
 320         struct spi_device *spi = m->spi;
 321         int status = 0;
 322         unsigned int n_transfers = 0, total_len = 0;
 323         bool can_use_prepend = false;
 324
 325         /*
 326          * This SPI controller does not support keeping CS active after a
 327          * transfer.
 328          * Work around this by merging as many transfers we can into one big
 329          * full-duplex transfers.
 330          */
 331         list_for_each_entry(t, &m->transfers, transfer_list) {
 332                 if (!first)
 333                         first = t;
 334
 335                 n_transfers++;
 336                 total_len += t->len;
 337
 338                 if (n_transfers == 2 && !first->rx_buf && !t->tx_buf &&
 339                     first->len <= BCM63XX_SPI_MAX_PREPEND)
 340                         can_use_prepend = true;
 341                 else if (can_use_prepend && t->tx_buf)
 342                         can_use_prepend = false;
 343
 344                 /* we can only transfer one fifo worth of data */
 345                 if ((can_use_prepend &&
 346                      total_len > (bs->fifo_size + BCM63XX_SPI_MAX_PREPEND)) ||
 347                     (!can_use_prepend && total_len > bs->fifo_size)) {
 348                         dev_err(&spi->dev, "unable to do transfers larger than FIFO size (%i > %i)\n",
 349                                 total_len, bs->fifo_size);
 350                         status = -EINVAL;
 351                         goto exit;
 352                 }
 353
 354                 /* all combined transfers have to have the same speed */
 355                 if (t->speed_hz != first->speed_hz) {
 356                         dev_err(&spi->dev, "unable to change speed between transfers\n");
 357                         status = -EINVAL;
 358                         goto exit;
 359                 }
 360
 361                 /* CS will be deasserted directly after transfer */
 362                 if (t->delay.value) {
 363                         dev_err(&spi->dev, "unable to keep CS asserted after transfer\n");
 364                         status = -EINVAL;
 365                         goto exit;
 366                 }
 367
 368                 if (t->cs_change ||
 369                     list_is_last(&t->transfer_list, &m->transfers)) {
 370                         /* configure adapter for a new transfer */
 371                         bcm63xx_spi_setup_transfer(spi, first);
 372
 373                         /* send the data */
 374                         status = bcm63xx_txrx_bufs(spi, first, n_transfers);
 375                         if (status)
 376                                 goto exit;
 377
 378                         m->actual_length += total_len;
 379
 380                         first = NULL;
 381                         n_transfers = 0;
 382                         total_len = 0;
 383                         can_use_prepend = false;
 384                 }
 385         }
 386 exit:
 387         m->status = status;
 388         spi_finalize_current_message(host);
 389
 390         return 0;
 391 }
 392
 393 /* This driver supports single host mode only. Hence
 394  * CMD_DONE is the only interrupt we care about
 395  */
 396 static irqreturn_t bcm63xx_spi_interrupt(int irq, void *dev_id)
 397 {
 398         struct spi_controller *host = (struct spi_controller *)dev_id;
 399         struct bcm63xx_spi *bs = spi_controller_get_devdata(host);
 400         u8 intr;
 401
 402         /* Read interupts and clear them immediately */
 403         intr = bcm_spi_readb(bs, SPI_INT_STATUS);
 404         bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS);
 405         bcm_spi_writeb(bs, 0, SPI_INT_MASK);
 406
 407         /* A transfer completed */
 408         if (intr & SPI_INTR_CMD_DONE)
 409                 complete(&bs->done);
 410
 411         return IRQ_HANDLED;
 412 }
 413
 414 static size_t bcm63xx_spi_max_length(struct spi_device *spi)
 415 {
 416         struct bcm63xx_spi *bs = spi_controller_get_devdata(spi->controller);
 417
 418         return bs->fifo_size;
 419 }
 420
 421 static const unsigned long bcm6348_spi_reg_offsets[] = {
 422         [SPI_CMD]               = SPI_6348_CMD,
 423         [SPI_INT_STATUS]        = SPI_6348_INT_STATUS,
 424         [SPI_INT_MASK_ST]       = SPI_6348_INT_MASK_ST,
 425         [SPI_INT_MASK]          = SPI_6348_INT_MASK,
 426         [SPI_ST]                = SPI_6348_ST,
 427         [SPI_CLK_CFG]           = SPI_6348_CLK_CFG,
 428         [SPI_FILL_BYTE]         = SPI_6348_FILL_BYTE,
 429         [SPI_MSG_TAIL]          = SPI_6348_MSG_TAIL,
 430         [SPI_RX_TAIL]           = SPI_6348_RX_TAIL,
 431         [SPI_MSG_CTL]           = SPI_6348_MSG_CTL,
 432         [SPI_MSG_DATA]          = SPI_6348_MSG_DATA,
 433         [SPI_RX_DATA]           = SPI_6348_RX_DATA,
 434         [SPI_MSG_TYPE_SHIFT]    = SPI_6348_MSG_TYPE_SHIFT,
 435         [SPI_MSG_CTL_WIDTH]     = SPI_6348_MSG_CTL_WIDTH,
 436         [SPI_MSG_DATA_SIZE]     = SPI_6348_MSG_DATA_SIZE,
 437 };
 438
 439 static const unsigned long bcm6358_spi_reg_offsets[] = {
 440         [SPI_CMD]               = SPI_6358_CMD,
 441         [SPI_INT_STATUS]        = SPI_6358_INT_STATUS,
 442         [SPI_INT_MASK_ST]       = SPI_6358_INT_MASK_ST,
 443         [SPI_INT_MASK]          = SPI_6358_INT_MASK,
 444         [SPI_ST]                = SPI_6358_ST,
 445         [SPI_CLK_CFG]           = SPI_6358_CLK_CFG,
 446         [SPI_FILL_BYTE]         = SPI_6358_FILL_BYTE,
 447         [SPI_MSG_TAIL]          = SPI_6358_MSG_TAIL,
 448         [SPI_RX_TAIL]           = SPI_6358_RX_TAIL,
 449         [SPI_MSG_CTL]           = SPI_6358_MSG_CTL,
 450         [SPI_MSG_DATA]          = SPI_6358_MSG_DATA,
 451         [SPI_RX_DATA]           = SPI_6358_RX_DATA,
 452         [SPI_MSG_TYPE_SHIFT]    = SPI_6358_MSG_TYPE_SHIFT,
 453         [SPI_MSG_CTL_WIDTH]     = SPI_6358_MSG_CTL_WIDTH,
 454         [SPI_MSG_DATA_SIZE]     = SPI_6358_MSG_DATA_SIZE,
 455 };
 456
 457 static const struct platform_device_id bcm63xx_spi_dev_match[] = {
 458         {
 459                 .name = "bcm6348-spi",
 460                 .driver_data = (unsigned long)bcm6348_spi_reg_offsets,
 461         },
 462         {
 463                 .name = "bcm6358-spi",
 464                 .driver_data = (unsigned long)bcm6358_spi_reg_offsets,
 465         },
 466         {
 467         },
 468 };
 469
 470 static const struct of_device_id bcm63xx_spi_of_match[] = {
 471         { .compatible = "brcm,bcm6348-spi", .data = &bcm6348_spi_reg_offsets },
 472         { .compatible = "brcm,bcm6358-spi", .data = &bcm6358_spi_reg_offsets },
 473         { },
 474 };
 475
 476 static int bcm63xx_spi_probe(struct platform_device *pdev)
 477 {
 478         struct resource *r;
 479         const unsigned long *bcm63xx_spireg;
 480         struct device *dev = &pdev->dev;
 481         int irq, bus_num;
 482         struct spi_controller *host;
 483         struct clk *clk;
 484         struct bcm63xx_spi *bs;
 485         int ret;
 486         u32 num_cs = BCM63XX_SPI_MAX_CS;
 487         struct reset_control *reset;
 488
 489         if (dev->of_node) {
 490                 const struct of_device_id *match;
 491
 492                 match = of_match_node(bcm63xx_spi_of_match, dev->of_node);
 493                 if (!match)
 494                         return -EINVAL;
 495                 bcm63xx_spireg = match->data;
 496
 497                 of_property_read_u32(dev->of_node, "num-cs", &num_cs);
 498                 if (num_cs > BCM63XX_SPI_MAX_CS) {
 499                         dev_warn(dev, "unsupported number of cs (%i), reducing to 8\n",
 500                                  num_cs);
 501                         num_cs = BCM63XX_SPI_MAX_CS;
 502                 }
 503
 504                 bus_num = -1;
 505         } else if (pdev->id_entry->driver_data) {
 506                 const struct platform_device_id *match = pdev->id_entry;
 507
 508                 bcm63xx_spireg = (const unsigned long *)match->driver_data;
 509                 bus_num = BCM63XX_SPI_BUS_NUM;
 510         } else {
 511                 return -EINVAL;
 512         }
 513
 514         irq = platform_get_irq(pdev, 0);
 515         if (irq < 0)
 516                 return irq;
 517
 518         clk = devm_clk_get(dev, "spi");
 519         if (IS_ERR(clk)) {
 520                 dev_err(dev, "no clock for device\n");
 521                 return PTR_ERR(clk);
 522         }
 523
 524         reset = devm_reset_control_get_optional_exclusive(dev, NULL);
 525         if (IS_ERR(reset))
 526                 return PTR_ERR(reset);
 527
 528         host = spi_alloc_host(dev, sizeof(*bs));
 529         if (!host) {
 530                 dev_err(dev, "out of memory\n");
 531                 return -ENOMEM;
 532         }
 533
 534         bs = spi_controller_get_devdata(host);
 535         init_completion(&bs->done);
 536
 537         platform_set_drvdata(pdev, host);
 538         bs->pdev = pdev;
 539
 540         bs->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &r);
 541         if (IS_ERR(bs->regs)) {
 542                 ret = PTR_ERR(bs->regs);
 543                 goto out_err;
 544         }
 545
 546         bs->irq = irq;
 547         bs->clk = clk;
 548         bs->reg_offsets = bcm63xx_spireg;
 549         bs->fifo_size = bs->reg_offsets[SPI_MSG_DATA_SIZE];
 550
 551         ret = devm_request_irq(&pdev->dev, irq, bcm63xx_spi_interrupt, 0,
 552                                pdev->name, host);
 553         if (ret) {
 554                 dev_err(dev, "unable to request irq\n");
 555                 goto out_err;
 556         }
 557
 558         host->dev.of_node = dev->of_node;
 559         host->bus_num = bus_num;
 560         host->num_chipselect = num_cs;
 561         host->transfer_one_message = bcm63xx_spi_transfer_one;
 562         host->mode_bits = MODEBITS;
 563         host->bits_per_word_mask = SPI_BPW_MASK(8);
 564         host->max_transfer_size = bcm63xx_spi_max_length;
 565         host->max_message_size = bcm63xx_spi_max_length;
 566         host->auto_runtime_pm = true;
 567         bs->msg_type_shift = bs->reg_offsets[SPI_MSG_TYPE_SHIFT];
 568         bs->msg_ctl_width = bs->reg_offsets[SPI_MSG_CTL_WIDTH];
 569         bs->tx_io = (u8 *)(bs->regs + bs->reg_offsets[SPI_MSG_DATA]);
 570         bs->rx_io = (const u8 *)(bs->regs + bs->reg_offsets[SPI_RX_DATA]);
 571
 572         /* Initialize hardware */
 573         ret = clk_prepare_enable(bs->clk);
 574         if (ret)
 575                 goto out_err;
 576
 577         ret = reset_control_reset(reset);
 578         if (ret) {
 579                 dev_err(dev, "unable to reset device: %d\n", ret);
 580                 goto out_clk_disable;
 581         }
 582
 583         bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS);
 584
 585         pm_runtime_enable(&pdev->dev);
 586
 587         /* register and we are done */
 588         ret = devm_spi_register_controller(dev, host);
 589         if (ret) {
 590                 dev_err(dev, "spi register failed\n");
 591                 goto out_pm_disable;
 592         }
 593
 594         dev_info(dev, "at %pr (irq %d, FIFOs size %d)\n",
 595                  r, irq, bs->fifo_size);
 596
 597         return 0;
 598
 599 out_pm_disable:
 600         pm_runtime_disable(&pdev->dev);
 601 out_clk_disable:
 602         clk_disable_unprepare(clk);
 603 out_err:
 604         spi_controller_put(host);
 605         return ret;
 606 }
 607
 608 static void bcm63xx_spi_remove(struct platform_device *pdev)
 609 {
 610         struct spi_controller *host = platform_get_drvdata(pdev);
 611         struct bcm63xx_spi *bs = spi_controller_get_devdata(host);
 612
 613         /* reset spi block */
 614         bcm_spi_writeb(bs, 0, SPI_INT_MASK);
 615
 616         /* HW shutdown */
 617         clk_disable_unprepare(bs->clk);
 618 }
 619
 620 static int bcm63xx_spi_suspend(struct device *dev)
 621 {
 622         struct spi_controller *host = dev_get_drvdata(dev);
 623         struct bcm63xx_spi *bs = spi_controller_get_devdata(host);
 624
 625         spi_controller_suspend(host);
 626
 627         clk_disable_unprepare(bs->clk);
 628
 629         return 0;
 630 }
 631
 632 static int bcm63xx_spi_resume(struct device *dev)
 633 {
 634         struct spi_controller *host = dev_get_drvdata(dev);
 635         struct bcm63xx_spi *bs = spi_controller_get_devdata(host);
 636         int ret;
 637
 638         ret = clk_prepare_enable(bs->clk);
 639         if (ret)
 640                 return ret;
 641
 642         spi_controller_resume(host);
 643
 644         return 0;
 645 }
 646
 647 static DEFINE_SIMPLE_DEV_PM_OPS(bcm63xx_spi_pm_ops, bcm63xx_spi_suspend, bcm63xx_spi_resume);
 648
 649 static struct platform_driver bcm63xx_spi_driver = {
 650         .driver = {
 651                 .name   = "bcm63xx-spi",
 652                 .pm     = &bcm63xx_spi_pm_ops,
 653                 .of_match_table = bcm63xx_spi_of_match,
 654         },
 655         .id_table       = bcm63xx_spi_dev_match,
 656         .probe          = bcm63xx_spi_probe,
 657         .remove_new     = bcm63xx_spi_remove,
 658 };
 659
 660 module_platform_driver(bcm63xx_spi_driver);
 661
 662 MODULE_ALIAS("platform:bcm63xx_spi");
 663 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
 664 MODULE_AUTHOR("Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>");
 665 MODULE_DESCRIPTION("Broadcom BCM63xx SPI Controller driver");
 666 MODULE_LICENSE("GPL");