spi-bcm63xx.c (17486B)
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 111enum 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 15 130 131#define BCM63XX_SPI_MAX_CS 8 132#define BCM63XX_SPI_BUS_NUM 0 133 134struct 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 154static 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 160static inline u16 bcm_spi_readw(struct bcm63xx_spi *bs, 161 unsigned int offset) 162{ 163#ifdef CONFIG_CPU_BIG_ENDIAN 164 return ioread16be(bs->regs + bs->reg_offsets[offset]); 165#else 166 return readw(bs->regs + bs->reg_offsets[offset]); 167#endif 168} 169 170static inline void bcm_spi_writeb(struct bcm63xx_spi *bs, 171 u8 value, unsigned int offset) 172{ 173 writeb(value, bs->regs + bs->reg_offsets[offset]); 174} 175 176static inline void bcm_spi_writew(struct bcm63xx_spi *bs, 177 u16 value, unsigned int offset) 178{ 179#ifdef CONFIG_CPU_BIG_ENDIAN 180 iowrite16be(value, bs->regs + bs->reg_offsets[offset]); 181#else 182 writew(value, bs->regs + bs->reg_offsets[offset]); 183#endif 184} 185 186static const unsigned int bcm63xx_spi_freq_table[SPI_CLK_MASK][2] = { 187 { 20000000, SPI_CLK_20MHZ }, 188 { 12500000, SPI_CLK_12_50MHZ }, 189 { 6250000, SPI_CLK_6_250MHZ }, 190 { 3125000, SPI_CLK_3_125MHZ }, 191 { 1563000, SPI_CLK_1_563MHZ }, 192 { 781000, SPI_CLK_0_781MHZ }, 193 { 391000, SPI_CLK_0_391MHZ } 194}; 195 196static void bcm63xx_spi_setup_transfer(struct spi_device *spi, 197 struct spi_transfer *t) 198{ 199 struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); 200 u8 clk_cfg, reg; 201 int i; 202 203 /* Default to lowest clock configuration */ 204 clk_cfg = SPI_CLK_0_391MHZ; 205 206 /* Find the closest clock configuration */ 207 for (i = 0; i < SPI_CLK_MASK; i++) { 208 if (t->speed_hz >= bcm63xx_spi_freq_table[i][0]) { 209 clk_cfg = bcm63xx_spi_freq_table[i][1]; 210 break; 211 } 212 } 213 214 /* clear existing clock configuration bits of the register */ 215 reg = bcm_spi_readb(bs, SPI_CLK_CFG); 216 reg &= ~SPI_CLK_MASK; 217 reg |= clk_cfg; 218 219 bcm_spi_writeb(bs, reg, SPI_CLK_CFG); 220 dev_dbg(&spi->dev, "Setting clock register to %02x (hz %d)\n", 221 clk_cfg, t->speed_hz); 222} 223 224/* the spi->mode bits understood by this driver: */ 225#define MODEBITS (SPI_CPOL | SPI_CPHA) 226 227static int bcm63xx_txrx_bufs(struct spi_device *spi, struct spi_transfer *first, 228 unsigned int num_transfers) 229{ 230 struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); 231 u16 msg_ctl; 232 u16 cmd; 233 unsigned int i, timeout = 0, prepend_len = 0, len = 0; 234 struct spi_transfer *t = first; 235 bool do_rx = false; 236 bool do_tx = false; 237 238 /* Disable the CMD_DONE interrupt */ 239 bcm_spi_writeb(bs, 0, SPI_INT_MASK); 240 241 dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n", 242 t->tx_buf, t->rx_buf, t->len); 243 244 if (num_transfers > 1 && t->tx_buf && t->len <= BCM63XX_SPI_MAX_PREPEND) 245 prepend_len = t->len; 246 247 /* prepare the buffer */ 248 for (i = 0; i < num_transfers; i++) { 249 if (t->tx_buf) { 250 do_tx = true; 251 memcpy_toio(bs->tx_io + len, t->tx_buf, t->len); 252 253 /* don't prepend more than one tx */ 254 if (t != first) 255 prepend_len = 0; 256 } 257 258 if (t->rx_buf) { 259 do_rx = true; 260 /* prepend is half-duplex write only */ 261 if (t == first) 262 prepend_len = 0; 263 } 264 265 len += t->len; 266 267 t = list_entry(t->transfer_list.next, struct spi_transfer, 268 transfer_list); 269 } 270 271 reinit_completion(&bs->done); 272 273 /* Fill in the Message control register */ 274 msg_ctl = (len << SPI_BYTE_CNT_SHIFT); 275 276 if (do_rx && do_tx && prepend_len == 0) 277 msg_ctl |= (SPI_FD_RW << bs->msg_type_shift); 278 else if (do_rx) 279 msg_ctl |= (SPI_HD_R << bs->msg_type_shift); 280 else if (do_tx) 281 msg_ctl |= (SPI_HD_W << bs->msg_type_shift); 282 283 switch (bs->msg_ctl_width) { 284 case 8: 285 bcm_spi_writeb(bs, msg_ctl, SPI_MSG_CTL); 286 break; 287 case 16: 288 bcm_spi_writew(bs, msg_ctl, SPI_MSG_CTL); 289 break; 290 } 291 292 /* Issue the transfer */ 293 cmd = SPI_CMD_START_IMMEDIATE; 294 cmd |= (prepend_len << SPI_CMD_PREPEND_BYTE_CNT_SHIFT); 295 cmd |= (spi->chip_select << SPI_CMD_DEVICE_ID_SHIFT); 296 bcm_spi_writew(bs, cmd, SPI_CMD); 297 298 /* Enable the CMD_DONE interrupt */ 299 bcm_spi_writeb(bs, SPI_INTR_CMD_DONE, SPI_INT_MASK); 300 301 timeout = wait_for_completion_timeout(&bs->done, HZ); 302 if (!timeout) 303 return -ETIMEDOUT; 304 305 if (!do_rx) 306 return 0; 307 308 len = 0; 309 t = first; 310 /* Read out all the data */ 311 for (i = 0; i < num_transfers; i++) { 312 if (t->rx_buf) 313 memcpy_fromio(t->rx_buf, bs->rx_io + len, t->len); 314 315 if (t != first || prepend_len == 0) 316 len += t->len; 317 318 t = list_entry(t->transfer_list.next, struct spi_transfer, 319 transfer_list); 320 } 321 322 return 0; 323} 324 325static int bcm63xx_spi_transfer_one(struct spi_master *master, 326 struct spi_message *m) 327{ 328 struct bcm63xx_spi *bs = spi_master_get_devdata(master); 329 struct spi_transfer *t, *first = NULL; 330 struct spi_device *spi = m->spi; 331 int status = 0; 332 unsigned int n_transfers = 0, total_len = 0; 333 bool can_use_prepend = false; 334 335 /* 336 * This SPI controller does not support keeping CS active after a 337 * transfer. 338 * Work around this by merging as many transfers we can into one big 339 * full-duplex transfers. 340 */ 341 list_for_each_entry(t, &m->transfers, transfer_list) { 342 if (!first) 343 first = t; 344 345 n_transfers++; 346 total_len += t->len; 347 348 if (n_transfers == 2 && !first->rx_buf && !t->tx_buf && 349 first->len <= BCM63XX_SPI_MAX_PREPEND) 350 can_use_prepend = true; 351 else if (can_use_prepend && t->tx_buf) 352 can_use_prepend = false; 353 354 /* we can only transfer one fifo worth of data */ 355 if ((can_use_prepend && 356 total_len > (bs->fifo_size + BCM63XX_SPI_MAX_PREPEND)) || 357 (!can_use_prepend && total_len > bs->fifo_size)) { 358 dev_err(&spi->dev, "unable to do transfers larger than FIFO size (%i > %i)\n", 359 total_len, bs->fifo_size); 360 status = -EINVAL; 361 goto exit; 362 } 363 364 /* all combined transfers have to have the same speed */ 365 if (t->speed_hz != first->speed_hz) { 366 dev_err(&spi->dev, "unable to change speed between transfers\n"); 367 status = -EINVAL; 368 goto exit; 369 } 370 371 /* CS will be deasserted directly after transfer */ 372 if (t->delay.value) { 373 dev_err(&spi->dev, "unable to keep CS asserted after transfer\n"); 374 status = -EINVAL; 375 goto exit; 376 } 377 378 if (t->cs_change || 379 list_is_last(&t->transfer_list, &m->transfers)) { 380 /* configure adapter for a new transfer */ 381 bcm63xx_spi_setup_transfer(spi, first); 382 383 /* send the data */ 384 status = bcm63xx_txrx_bufs(spi, first, n_transfers); 385 if (status) 386 goto exit; 387 388 m->actual_length += total_len; 389 390 first = NULL; 391 n_transfers = 0; 392 total_len = 0; 393 can_use_prepend = false; 394 } 395 } 396exit: 397 m->status = status; 398 spi_finalize_current_message(master); 399 400 return 0; 401} 402 403/* This driver supports single master mode only. Hence 404 * CMD_DONE is the only interrupt we care about 405 */ 406static irqreturn_t bcm63xx_spi_interrupt(int irq, void *dev_id) 407{ 408 struct spi_master *master = (struct spi_master *)dev_id; 409 struct bcm63xx_spi *bs = spi_master_get_devdata(master); 410 u8 intr; 411 412 /* Read interupts and clear them immediately */ 413 intr = bcm_spi_readb(bs, SPI_INT_STATUS); 414 bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS); 415 bcm_spi_writeb(bs, 0, SPI_INT_MASK); 416 417 /* A transfer completed */ 418 if (intr & SPI_INTR_CMD_DONE) 419 complete(&bs->done); 420 421 return IRQ_HANDLED; 422} 423 424static size_t bcm63xx_spi_max_length(struct spi_device *spi) 425{ 426 struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); 427 428 return bs->fifo_size; 429} 430 431static const unsigned long bcm6348_spi_reg_offsets[] = { 432 [SPI_CMD] = SPI_6348_CMD, 433 [SPI_INT_STATUS] = SPI_6348_INT_STATUS, 434 [SPI_INT_MASK_ST] = SPI_6348_INT_MASK_ST, 435 [SPI_INT_MASK] = SPI_6348_INT_MASK, 436 [SPI_ST] = SPI_6348_ST, 437 [SPI_CLK_CFG] = SPI_6348_CLK_CFG, 438 [SPI_FILL_BYTE] = SPI_6348_FILL_BYTE, 439 [SPI_MSG_TAIL] = SPI_6348_MSG_TAIL, 440 [SPI_RX_TAIL] = SPI_6348_RX_TAIL, 441 [SPI_MSG_CTL] = SPI_6348_MSG_CTL, 442 [SPI_MSG_DATA] = SPI_6348_MSG_DATA, 443 [SPI_RX_DATA] = SPI_6348_RX_DATA, 444 [SPI_MSG_TYPE_SHIFT] = SPI_6348_MSG_TYPE_SHIFT, 445 [SPI_MSG_CTL_WIDTH] = SPI_6348_MSG_CTL_WIDTH, 446 [SPI_MSG_DATA_SIZE] = SPI_6348_MSG_DATA_SIZE, 447}; 448 449static const unsigned long bcm6358_spi_reg_offsets[] = { 450 [SPI_CMD] = SPI_6358_CMD, 451 [SPI_INT_STATUS] = SPI_6358_INT_STATUS, 452 [SPI_INT_MASK_ST] = SPI_6358_INT_MASK_ST, 453 [SPI_INT_MASK] = SPI_6358_INT_MASK, 454 [SPI_ST] = SPI_6358_ST, 455 [SPI_CLK_CFG] = SPI_6358_CLK_CFG, 456 [SPI_FILL_BYTE] = SPI_6358_FILL_BYTE, 457 [SPI_MSG_TAIL] = SPI_6358_MSG_TAIL, 458 [SPI_RX_TAIL] = SPI_6358_RX_TAIL, 459 [SPI_MSG_CTL] = SPI_6358_MSG_CTL, 460 [SPI_MSG_DATA] = SPI_6358_MSG_DATA, 461 [SPI_RX_DATA] = SPI_6358_RX_DATA, 462 [SPI_MSG_TYPE_SHIFT] = SPI_6358_MSG_TYPE_SHIFT, 463 [SPI_MSG_CTL_WIDTH] = SPI_6358_MSG_CTL_WIDTH, 464 [SPI_MSG_DATA_SIZE] = SPI_6358_MSG_DATA_SIZE, 465}; 466 467static const struct platform_device_id bcm63xx_spi_dev_match[] = { 468 { 469 .name = "bcm6348-spi", 470 .driver_data = (unsigned long)bcm6348_spi_reg_offsets, 471 }, 472 { 473 .name = "bcm6358-spi", 474 .driver_data = (unsigned long)bcm6358_spi_reg_offsets, 475 }, 476 { 477 }, 478}; 479 480static const struct of_device_id bcm63xx_spi_of_match[] = { 481 { .compatible = "brcm,bcm6348-spi", .data = &bcm6348_spi_reg_offsets }, 482 { .compatible = "brcm,bcm6358-spi", .data = &bcm6358_spi_reg_offsets }, 483 { }, 484}; 485 486static int bcm63xx_spi_probe(struct platform_device *pdev) 487{ 488 struct resource *r; 489 const unsigned long *bcm63xx_spireg; 490 struct device *dev = &pdev->dev; 491 int irq, bus_num; 492 struct spi_master *master; 493 struct clk *clk; 494 struct bcm63xx_spi *bs; 495 int ret; 496 u32 num_cs = BCM63XX_SPI_MAX_CS; 497 struct reset_control *reset; 498 499 if (dev->of_node) { 500 const struct of_device_id *match; 501 502 match = of_match_node(bcm63xx_spi_of_match, dev->of_node); 503 if (!match) 504 return -EINVAL; 505 bcm63xx_spireg = match->data; 506 507 of_property_read_u32(dev->of_node, "num-cs", &num_cs); 508 if (num_cs > BCM63XX_SPI_MAX_CS) { 509 dev_warn(dev, "unsupported number of cs (%i), reducing to 8\n", 510 num_cs); 511 num_cs = BCM63XX_SPI_MAX_CS; 512 } 513 514 bus_num = -1; 515 } else if (pdev->id_entry->driver_data) { 516 const struct platform_device_id *match = pdev->id_entry; 517 518 bcm63xx_spireg = (const unsigned long *)match->driver_data; 519 bus_num = BCM63XX_SPI_BUS_NUM; 520 } else { 521 return -EINVAL; 522 } 523 524 irq = platform_get_irq(pdev, 0); 525 if (irq < 0) 526 return irq; 527 528 clk = devm_clk_get(dev, "spi"); 529 if (IS_ERR(clk)) { 530 dev_err(dev, "no clock for device\n"); 531 return PTR_ERR(clk); 532 } 533 534 reset = devm_reset_control_get_optional_exclusive(dev, NULL); 535 if (IS_ERR(reset)) 536 return PTR_ERR(reset); 537 538 master = spi_alloc_master(dev, sizeof(*bs)); 539 if (!master) { 540 dev_err(dev, "out of memory\n"); 541 return -ENOMEM; 542 } 543 544 bs = spi_master_get_devdata(master); 545 init_completion(&bs->done); 546 547 platform_set_drvdata(pdev, master); 548 bs->pdev = pdev; 549 550 r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 551 bs->regs = devm_ioremap_resource(&pdev->dev, r); 552 if (IS_ERR(bs->regs)) { 553 ret = PTR_ERR(bs->regs); 554 goto out_err; 555 } 556 557 bs->irq = irq; 558 bs->clk = clk; 559 bs->reg_offsets = bcm63xx_spireg; 560 bs->fifo_size = bs->reg_offsets[SPI_MSG_DATA_SIZE]; 561 562 ret = devm_request_irq(&pdev->dev, irq, bcm63xx_spi_interrupt, 0, 563 pdev->name, master); 564 if (ret) { 565 dev_err(dev, "unable to request irq\n"); 566 goto out_err; 567 } 568 569 master->dev.of_node = dev->of_node; 570 master->bus_num = bus_num; 571 master->num_chipselect = num_cs; 572 master->transfer_one_message = bcm63xx_spi_transfer_one; 573 master->mode_bits = MODEBITS; 574 master->bits_per_word_mask = SPI_BPW_MASK(8); 575 master->max_transfer_size = bcm63xx_spi_max_length; 576 master->max_message_size = bcm63xx_spi_max_length; 577 master->auto_runtime_pm = true; 578 bs->msg_type_shift = bs->reg_offsets[SPI_MSG_TYPE_SHIFT]; 579 bs->msg_ctl_width = bs->reg_offsets[SPI_MSG_CTL_WIDTH]; 580 bs->tx_io = (u8 *)(bs->regs + bs->reg_offsets[SPI_MSG_DATA]); 581 bs->rx_io = (const u8 *)(bs->regs + bs->reg_offsets[SPI_RX_DATA]); 582 583 /* Initialize hardware */ 584 ret = clk_prepare_enable(bs->clk); 585 if (ret) 586 goto out_err; 587 588 ret = reset_control_reset(reset); 589 if (ret) { 590 dev_err(dev, "unable to reset device: %d\n", ret); 591 goto out_clk_disable; 592 } 593 594 bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS); 595 596 pm_runtime_enable(&pdev->dev); 597 598 /* register and we are done */ 599 ret = devm_spi_register_master(dev, master); 600 if (ret) { 601 dev_err(dev, "spi register failed\n"); 602 goto out_pm_disable; 603 } 604 605 dev_info(dev, "at %pr (irq %d, FIFOs size %d)\n", 606 r, irq, bs->fifo_size); 607 608 return 0; 609 610out_pm_disable: 611 pm_runtime_disable(&pdev->dev); 612out_clk_disable: 613 clk_disable_unprepare(clk); 614out_err: 615 spi_master_put(master); 616 return ret; 617} 618 619static int bcm63xx_spi_remove(struct platform_device *pdev) 620{ 621 struct spi_master *master = platform_get_drvdata(pdev); 622 struct bcm63xx_spi *bs = spi_master_get_devdata(master); 623 624 /* reset spi block */ 625 bcm_spi_writeb(bs, 0, SPI_INT_MASK); 626 627 /* HW shutdown */ 628 clk_disable_unprepare(bs->clk); 629 630 return 0; 631} 632 633#ifdef CONFIG_PM_SLEEP 634static int bcm63xx_spi_suspend(struct device *dev) 635{ 636 struct spi_master *master = dev_get_drvdata(dev); 637 struct bcm63xx_spi *bs = spi_master_get_devdata(master); 638 639 spi_master_suspend(master); 640 641 clk_disable_unprepare(bs->clk); 642 643 return 0; 644} 645 646static int bcm63xx_spi_resume(struct device *dev) 647{ 648 struct spi_master *master = dev_get_drvdata(dev); 649 struct bcm63xx_spi *bs = spi_master_get_devdata(master); 650 int ret; 651 652 ret = clk_prepare_enable(bs->clk); 653 if (ret) 654 return ret; 655 656 spi_master_resume(master); 657 658 return 0; 659} 660#endif 661 662static const struct dev_pm_ops bcm63xx_spi_pm_ops = { 663 SET_SYSTEM_SLEEP_PM_OPS(bcm63xx_spi_suspend, bcm63xx_spi_resume) 664}; 665 666static struct platform_driver bcm63xx_spi_driver = { 667 .driver = { 668 .name = "bcm63xx-spi", 669 .pm = &bcm63xx_spi_pm_ops, 670 .of_match_table = bcm63xx_spi_of_match, 671 }, 672 .id_table = bcm63xx_spi_dev_match, 673 .probe = bcm63xx_spi_probe, 674 .remove = bcm63xx_spi_remove, 675}; 676 677module_platform_driver(bcm63xx_spi_driver); 678 679MODULE_ALIAS("platform:bcm63xx_spi"); 680MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); 681MODULE_AUTHOR("Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>"); 682MODULE_DESCRIPTION("Broadcom BCM63xx SPI Controller driver"); 683MODULE_LICENSE("GPL");