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 22 /* BCM 6338/6348 SPI core */ 23 #define SPI_6348_RSET_SIZE 64 24 #define SPI_6348_CMD 0x00 /* 16-bits register */ 25 #define SPI_6348_INT_STATUS 0x02 26 #define SPI_6348_INT_MASK_ST 0x03 27 #define SPI_6348_INT_MASK 0x04 28 #define SPI_6348_ST 0x05 29 #define SPI_6348_CLK_CFG 0x06 30 #define SPI_6348_FILL_BYTE 0x07 31 #define SPI_6348_MSG_TAIL 0x09 32 #define SPI_6348_RX_TAIL 0x0b 33 #define SPI_6348_MSG_CTL 0x40 /* 8-bits register */ 34 #define SPI_6348_MSG_CTL_WIDTH 8 35 #define SPI_6348_MSG_DATA 0x41 36 #define SPI_6348_MSG_DATA_SIZE 0x3f 37 #define SPI_6348_RX_DATA 0x80 38 #define SPI_6348_RX_DATA_SIZE 0x3f 39 40 /* BCM 3368/6358/6262/6368 SPI core */ 41 #define SPI_6358_RSET_SIZE 1804 42 #define SPI_6358_MSG_CTL 0x00 /* 16-bits register */ 43 #define SPI_6358_MSG_CTL_WIDTH 16 44 #define SPI_6358_MSG_DATA 0x02 45 #define SPI_6358_MSG_DATA_SIZE 0x21e 46 #define SPI_6358_RX_DATA 0x400 47 #define SPI_6358_RX_DATA_SIZE 0x220 48 #define SPI_6358_CMD 0x700 /* 16-bits register */ 49 #define SPI_6358_INT_STATUS 0x702 50 #define SPI_6358_INT_MASK_ST 0x703 51 #define SPI_6358_INT_MASK 0x704 52 #define SPI_6358_ST 0x705 53 #define SPI_6358_CLK_CFG 0x706 54 #define SPI_6358_FILL_BYTE 0x707 55 #define SPI_6358_MSG_TAIL 0x709 56 #define SPI_6358_RX_TAIL 0x70B 57 58 /* Shared SPI definitions */ 59 60 /* Message configuration */ 61 #define SPI_FD_RW 0x00 62 #define SPI_HD_W 0x01 63 #define SPI_HD_R 0x02 64 #define SPI_BYTE_CNT_SHIFT 0 65 #define SPI_6348_MSG_TYPE_SHIFT 6 66 #define SPI_6358_MSG_TYPE_SHIFT 14 67 68 /* Command */ 69 #define SPI_CMD_NOOP 0x00 70 #define SPI_CMD_SOFT_RESET 0x01 71 #define SPI_CMD_HARD_RESET 0x02 72 #define SPI_CMD_START_IMMEDIATE 0x03 73 #define SPI_CMD_COMMAND_SHIFT 0 74 #define SPI_CMD_COMMAND_MASK 0x000f 75 #define SPI_CMD_DEVICE_ID_SHIFT 4 76 #define SPI_CMD_PREPEND_BYTE_CNT_SHIFT 8 77 #define SPI_CMD_ONE_BYTE_SHIFT 11 78 #define SPI_CMD_ONE_WIRE_SHIFT 12 79 #define SPI_DEV_ID_0 0 80 #define SPI_DEV_ID_1 1 81 #define SPI_DEV_ID_2 2 82 #define SPI_DEV_ID_3 3 83 84 /* Interrupt mask */ 85 #define SPI_INTR_CMD_DONE 0x01 86 #define SPI_INTR_RX_OVERFLOW 0x02 87 #define SPI_INTR_TX_UNDERFLOW 0x04 88 #define SPI_INTR_TX_OVERFLOW 0x08 89 #define SPI_INTR_RX_UNDERFLOW 0x10 90 #define SPI_INTR_CLEAR_ALL 0x1f 91 92 /* Status */ 93 #define SPI_RX_EMPTY 0x02 94 #define SPI_CMD_BUSY 0x04 95 #define SPI_SERIAL_BUSY 0x08 96 97 /* Clock configuration */ 98 #define SPI_CLK_20MHZ 0x00 99 #define SPI_CLK_0_391MHZ 0x01 100 #define SPI_CLK_0_781MHZ 0x02 /* default */ 101 #define SPI_CLK_1_563MHZ 0x03 102 #define SPI_CLK_3_125MHZ 0x04 103 #define SPI_CLK_6_250MHZ 0x05 104 #define SPI_CLK_12_50MHZ 0x06 105 #define SPI_CLK_MASK 0x07 106 #define SPI_SSOFFTIME_MASK 0x38 107 #define SPI_SSOFFTIME_SHIFT 3 108 #define SPI_BYTE_SWAP 0x80 109 110 enum bcm63xx_regs_spi { 111 SPI_CMD, 112 SPI_INT_STATUS, 113 SPI_INT_MASK_ST, 114 SPI_INT_MASK, 115 SPI_ST, 116 SPI_CLK_CFG, 117 SPI_FILL_BYTE, 118 SPI_MSG_TAIL, 119 SPI_RX_TAIL, 120 SPI_MSG_CTL, 121 SPI_MSG_DATA, 122 SPI_RX_DATA, 123 SPI_MSG_TYPE_SHIFT, 124 SPI_MSG_CTL_WIDTH, 125 SPI_MSG_DATA_SIZE, 126 }; 127 128 #define BCM63XX_SPI_MAX_PREPEND 15 129 130 #define BCM63XX_SPI_MAX_CS 8 131 #define BCM63XX_SPI_BUS_NUM 0 132 133 struct bcm63xx_spi { 134 struct completion done; 135 136 void __iomem *regs; 137 int irq; 138 139 /* Platform data */ 140 const unsigned long *reg_offsets; 141 unsigned int fifo_size; 142 unsigned int msg_type_shift; 143 unsigned int msg_ctl_width; 144 145 /* data iomem */ 146 u8 __iomem *tx_io; 147 const u8 __iomem *rx_io; 148 149 struct clk *clk; 150 struct platform_device *pdev; 151 }; 152 153 static inline u8 bcm_spi_readb(struct bcm63xx_spi *bs, 154 unsigned int offset) 155 { 156 return readb(bs->regs + bs->reg_offsets[offset]); 157 } 158 159 static inline u16 bcm_spi_readw(struct bcm63xx_spi *bs, 160 unsigned int offset) 161 { 162 #ifdef CONFIG_CPU_BIG_ENDIAN 163 return ioread16be(bs->regs + bs->reg_offsets[offset]); 164 #else 165 return readw(bs->regs + bs->reg_offsets[offset]); 166 #endif 167 } 168 169 static inline void bcm_spi_writeb(struct bcm63xx_spi *bs, 170 u8 value, unsigned int offset) 171 { 172 writeb(value, bs->regs + bs->reg_offsets[offset]); 173 } 174 175 static inline void bcm_spi_writew(struct bcm63xx_spi *bs, 176 u16 value, unsigned int offset) 177 { 178 #ifdef CONFIG_CPU_BIG_ENDIAN 179 iowrite16be(value, bs->regs + bs->reg_offsets[offset]); 180 #else 181 writew(value, bs->regs + bs->reg_offsets[offset]); 182 #endif 183 } 184 185 static const unsigned int bcm63xx_spi_freq_table[SPI_CLK_MASK][2] = { 186 { 20000000, SPI_CLK_20MHZ }, 187 { 12500000, SPI_CLK_12_50MHZ }, 188 { 6250000, SPI_CLK_6_250MHZ }, 189 { 3125000, SPI_CLK_3_125MHZ }, 190 { 1563000, SPI_CLK_1_563MHZ }, 191 { 781000, SPI_CLK_0_781MHZ }, 192 { 391000, SPI_CLK_0_391MHZ } 193 }; 194 195 static void bcm63xx_spi_setup_transfer(struct spi_device *spi, 196 struct spi_transfer *t) 197 { 198 struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); 199 u8 clk_cfg, reg; 200 int i; 201 202 /* Default to lowest clock configuration */ 203 clk_cfg = SPI_CLK_0_391MHZ; 204 205 /* Find the closest clock configuration */ 206 for (i = 0; i < SPI_CLK_MASK; i++) { 207 if (t->speed_hz >= bcm63xx_spi_freq_table[i][0]) { 208 clk_cfg = bcm63xx_spi_freq_table[i][1]; 209 break; 210 } 211 } 212 213 /* clear existing clock configuration bits of the register */ 214 reg = bcm_spi_readb(bs, SPI_CLK_CFG); 215 reg &= ~SPI_CLK_MASK; 216 reg |= clk_cfg; 217 218 bcm_spi_writeb(bs, reg, SPI_CLK_CFG); 219 dev_dbg(&spi->dev, "Setting clock register to %02x (hz %d)\n", 220 clk_cfg, t->speed_hz); 221 } 222 223 /* the spi->mode bits understood by this driver: */ 224 #define MODEBITS (SPI_CPOL | SPI_CPHA) 225 226 static int bcm63xx_txrx_bufs(struct spi_device *spi, struct spi_transfer *first, 227 unsigned int num_transfers) 228 { 229 struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); 230 u16 msg_ctl; 231 u16 cmd; 232 unsigned int i, timeout = 0, prepend_len = 0, len = 0; 233 struct spi_transfer *t = first; 234 bool do_rx = false; 235 bool do_tx = false; 236 237 /* Disable the CMD_DONE interrupt */ 238 bcm_spi_writeb(bs, 0, SPI_INT_MASK); 239 240 dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n", 241 t->tx_buf, t->rx_buf, t->len); 242 243 if (num_transfers > 1 && t->tx_buf && t->len <= BCM63XX_SPI_MAX_PREPEND) 244 prepend_len = t->len; 245 246 /* prepare the buffer */ 247 for (i = 0; i < num_transfers; i++) { 248 if (t->tx_buf) { 249 do_tx = true; 250 memcpy_toio(bs->tx_io + len, t->tx_buf, t->len); 251 252 /* don't prepend more than one tx */ 253 if (t != first) 254 prepend_len = 0; 255 } 256 257 if (t->rx_buf) { 258 do_rx = true; 259 /* prepend is half-duplex write only */ 260 if (t == first) 261 prepend_len = 0; 262 } 263 264 len += t->len; 265 266 t = list_entry(t->transfer_list.next, struct spi_transfer, 267 transfer_list); 268 } 269 270 reinit_completion(&bs->done); 271 272 /* Fill in the Message control register */ 273 msg_ctl = (len << SPI_BYTE_CNT_SHIFT); 274 275 if (do_rx && do_tx && prepend_len == 0) 276 msg_ctl |= (SPI_FD_RW << bs->msg_type_shift); 277 else if (do_rx) 278 msg_ctl |= (SPI_HD_R << bs->msg_type_shift); 279 else if (do_tx) 280 msg_ctl |= (SPI_HD_W << bs->msg_type_shift); 281 282 switch (bs->msg_ctl_width) { 283 case 8: 284 bcm_spi_writeb(bs, msg_ctl, SPI_MSG_CTL); 285 break; 286 case 16: 287 bcm_spi_writew(bs, msg_ctl, SPI_MSG_CTL); 288 break; 289 } 290 291 /* Issue the transfer */ 292 cmd = SPI_CMD_START_IMMEDIATE; 293 cmd |= (prepend_len << SPI_CMD_PREPEND_BYTE_CNT_SHIFT); 294 cmd |= (spi->chip_select << SPI_CMD_DEVICE_ID_SHIFT); 295 bcm_spi_writew(bs, cmd, SPI_CMD); 296 297 /* Enable the CMD_DONE interrupt */ 298 bcm_spi_writeb(bs, SPI_INTR_CMD_DONE, SPI_INT_MASK); 299 300 timeout = wait_for_completion_timeout(&bs->done, HZ); 301 if (!timeout) 302 return -ETIMEDOUT; 303 304 if (!do_rx) 305 return 0; 306 307 len = 0; 308 t = first; 309 /* Read out all the data */ 310 for (i = 0; i < num_transfers; i++) { 311 if (t->rx_buf) 312 memcpy_fromio(t->rx_buf, bs->rx_io + len, t->len); 313 314 if (t != first || prepend_len == 0) 315 len += t->len; 316 317 t = list_entry(t->transfer_list.next, struct spi_transfer, 318 transfer_list); 319 } 320 321 return 0; 322 } 323 324 static int bcm63xx_spi_transfer_one(struct spi_master *master, 325 struct spi_message *m) 326 { 327 struct bcm63xx_spi *bs = spi_master_get_devdata(master); 328 struct spi_transfer *t, *first = NULL; 329 struct spi_device *spi = m->spi; 330 int status = 0; 331 unsigned int n_transfers = 0, total_len = 0; 332 bool can_use_prepend = false; 333 334 /* 335 * This SPI controller does not support keeping CS active after a 336 * transfer. 337 * Work around this by merging as many transfers we can into one big 338 * full-duplex transfers. 339 */ 340 list_for_each_entry(t, &m->transfers, transfer_list) { 341 if (!first) 342 first = t; 343 344 n_transfers++; 345 total_len += t->len; 346 347 if (n_transfers == 2 && !first->rx_buf && !t->tx_buf && 348 first->len <= BCM63XX_SPI_MAX_PREPEND) 349 can_use_prepend = true; 350 else if (can_use_prepend && t->tx_buf) 351 can_use_prepend = false; 352 353 /* we can only transfer one fifo worth of data */ 354 if ((can_use_prepend && 355 total_len > (bs->fifo_size + BCM63XX_SPI_MAX_PREPEND)) || 356 (!can_use_prepend && total_len > bs->fifo_size)) { 357 dev_err(&spi->dev, "unable to do transfers larger than FIFO size (%i > %i)\n", 358 total_len, bs->fifo_size); 359 status = -EINVAL; 360 goto exit; 361 } 362 363 /* all combined transfers have to have the same speed */ 364 if (t->speed_hz != first->speed_hz) { 365 dev_err(&spi->dev, "unable to change speed between transfers\n"); 366 status = -EINVAL; 367 goto exit; 368 } 369 370 /* CS will be deasserted directly after transfer */ 371 if (t->delay_usecs) { 372 dev_err(&spi->dev, "unable to keep CS asserted after transfer\n"); 373 status = -EINVAL; 374 goto exit; 375 } 376 377 if (t->cs_change || 378 list_is_last(&t->transfer_list, &m->transfers)) { 379 /* configure adapter for a new transfer */ 380 bcm63xx_spi_setup_transfer(spi, first); 381 382 /* send the data */ 383 status = bcm63xx_txrx_bufs(spi, first, n_transfers); 384 if (status) 385 goto exit; 386 387 m->actual_length += total_len; 388 389 first = NULL; 390 n_transfers = 0; 391 total_len = 0; 392 can_use_prepend = false; 393 } 394 } 395 exit: 396 m->status = status; 397 spi_finalize_current_message(master); 398 399 return 0; 400 } 401 402 /* This driver supports single master mode only. Hence 403 * CMD_DONE is the only interrupt we care about 404 */ 405 static irqreturn_t bcm63xx_spi_interrupt(int irq, void *dev_id) 406 { 407 struct spi_master *master = (struct spi_master *)dev_id; 408 struct bcm63xx_spi *bs = spi_master_get_devdata(master); 409 u8 intr; 410 411 /* Read interupts and clear them immediately */ 412 intr = bcm_spi_readb(bs, SPI_INT_STATUS); 413 bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS); 414 bcm_spi_writeb(bs, 0, SPI_INT_MASK); 415 416 /* A transfer completed */ 417 if (intr & SPI_INTR_CMD_DONE) 418 complete(&bs->done); 419 420 return IRQ_HANDLED; 421 } 422 423 static size_t bcm63xx_spi_max_length(struct spi_device *spi) 424 { 425 struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); 426 427 return bs->fifo_size; 428 } 429 430 static const unsigned long bcm6348_spi_reg_offsets[] = { 431 [SPI_CMD] = SPI_6348_CMD, 432 [SPI_INT_STATUS] = SPI_6348_INT_STATUS, 433 [SPI_INT_MASK_ST] = SPI_6348_INT_MASK_ST, 434 [SPI_INT_MASK] = SPI_6348_INT_MASK, 435 [SPI_ST] = SPI_6348_ST, 436 [SPI_CLK_CFG] = SPI_6348_CLK_CFG, 437 [SPI_FILL_BYTE] = SPI_6348_FILL_BYTE, 438 [SPI_MSG_TAIL] = SPI_6348_MSG_TAIL, 439 [SPI_RX_TAIL] = SPI_6348_RX_TAIL, 440 [SPI_MSG_CTL] = SPI_6348_MSG_CTL, 441 [SPI_MSG_DATA] = SPI_6348_MSG_DATA, 442 [SPI_RX_DATA] = SPI_6348_RX_DATA, 443 [SPI_MSG_TYPE_SHIFT] = SPI_6348_MSG_TYPE_SHIFT, 444 [SPI_MSG_CTL_WIDTH] = SPI_6348_MSG_CTL_WIDTH, 445 [SPI_MSG_DATA_SIZE] = SPI_6348_MSG_DATA_SIZE, 446 }; 447 448 static const unsigned long bcm6358_spi_reg_offsets[] = { 449 [SPI_CMD] = SPI_6358_CMD, 450 [SPI_INT_STATUS] = SPI_6358_INT_STATUS, 451 [SPI_INT_MASK_ST] = SPI_6358_INT_MASK_ST, 452 [SPI_INT_MASK] = SPI_6358_INT_MASK, 453 [SPI_ST] = SPI_6358_ST, 454 [SPI_CLK_CFG] = SPI_6358_CLK_CFG, 455 [SPI_FILL_BYTE] = SPI_6358_FILL_BYTE, 456 [SPI_MSG_TAIL] = SPI_6358_MSG_TAIL, 457 [SPI_RX_TAIL] = SPI_6358_RX_TAIL, 458 [SPI_MSG_CTL] = SPI_6358_MSG_CTL, 459 [SPI_MSG_DATA] = SPI_6358_MSG_DATA, 460 [SPI_RX_DATA] = SPI_6358_RX_DATA, 461 [SPI_MSG_TYPE_SHIFT] = SPI_6358_MSG_TYPE_SHIFT, 462 [SPI_MSG_CTL_WIDTH] = SPI_6358_MSG_CTL_WIDTH, 463 [SPI_MSG_DATA_SIZE] = SPI_6358_MSG_DATA_SIZE, 464 }; 465 466 static const struct platform_device_id bcm63xx_spi_dev_match[] = { 467 { 468 .name = "bcm6348-spi", 469 .driver_data = (unsigned long)bcm6348_spi_reg_offsets, 470 }, 471 { 472 .name = "bcm6358-spi", 473 .driver_data = (unsigned long)bcm6358_spi_reg_offsets, 474 }, 475 { 476 }, 477 }; 478 479 static const struct of_device_id bcm63xx_spi_of_match[] = { 480 { .compatible = "brcm,bcm6348-spi", .data = &bcm6348_spi_reg_offsets }, 481 { .compatible = "brcm,bcm6358-spi", .data = &bcm6358_spi_reg_offsets }, 482 { }, 483 }; 484 485 static int bcm63xx_spi_probe(struct platform_device *pdev) 486 { 487 struct resource *r; 488 const unsigned long *bcm63xx_spireg; 489 struct device *dev = &pdev->dev; 490 int irq, bus_num; 491 struct spi_master *master; 492 struct clk *clk; 493 struct bcm63xx_spi *bs; 494 int ret; 495 u32 num_cs = BCM63XX_SPI_MAX_CS; 496 497 if (dev->of_node) { 498 const struct of_device_id *match; 499 500 match = of_match_node(bcm63xx_spi_of_match, dev->of_node); 501 if (!match) 502 return -EINVAL; 503 bcm63xx_spireg = match->data; 504 505 of_property_read_u32(dev->of_node, "num-cs", &num_cs); 506 if (num_cs > BCM63XX_SPI_MAX_CS) { 507 dev_warn(dev, "unsupported number of cs (%i), reducing to 8\n", 508 num_cs); 509 num_cs = BCM63XX_SPI_MAX_CS; 510 } 511 512 bus_num = -1; 513 } else if (pdev->id_entry->driver_data) { 514 const struct platform_device_id *match = pdev->id_entry; 515 516 bcm63xx_spireg = (const unsigned long *)match->driver_data; 517 bus_num = BCM63XX_SPI_BUS_NUM; 518 } else { 519 return -EINVAL; 520 } 521 522 irq = platform_get_irq(pdev, 0); 523 if (irq < 0) { 524 dev_err(dev, "no irq: %d\n", irq); 525 return irq; 526 } 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 master = spi_alloc_master(dev, sizeof(*bs)); 535 if (!master) { 536 dev_err(dev, "out of memory\n"); 537 return -ENOMEM; 538 } 539 540 bs = spi_master_get_devdata(master); 541 init_completion(&bs->done); 542 543 platform_set_drvdata(pdev, master); 544 bs->pdev = pdev; 545 546 r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 547 bs->regs = devm_ioremap_resource(&pdev->dev, r); 548 if (IS_ERR(bs->regs)) { 549 ret = PTR_ERR(bs->regs); 550 goto out_err; 551 } 552 553 bs->irq = irq; 554 bs->clk = clk; 555 bs->reg_offsets = bcm63xx_spireg; 556 bs->fifo_size = bs->reg_offsets[SPI_MSG_DATA_SIZE]; 557 558 ret = devm_request_irq(&pdev->dev, irq, bcm63xx_spi_interrupt, 0, 559 pdev->name, master); 560 if (ret) { 561 dev_err(dev, "unable to request irq\n"); 562 goto out_err; 563 } 564 565 master->dev.of_node = dev->of_node; 566 master->bus_num = bus_num; 567 master->num_chipselect = num_cs; 568 master->transfer_one_message = bcm63xx_spi_transfer_one; 569 master->mode_bits = MODEBITS; 570 master->bits_per_word_mask = SPI_BPW_MASK(8); 571 master->max_transfer_size = bcm63xx_spi_max_length; 572 master->max_message_size = bcm63xx_spi_max_length; 573 master->auto_runtime_pm = true; 574 bs->msg_type_shift = bs->reg_offsets[SPI_MSG_TYPE_SHIFT]; 575 bs->msg_ctl_width = bs->reg_offsets[SPI_MSG_CTL_WIDTH]; 576 bs->tx_io = (u8 *)(bs->regs + bs->reg_offsets[SPI_MSG_DATA]); 577 bs->rx_io = (const u8 *)(bs->regs + bs->reg_offsets[SPI_RX_DATA]); 578 579 /* Initialize hardware */ 580 ret = clk_prepare_enable(bs->clk); 581 if (ret) 582 goto out_err; 583 584 bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS); 585 586 /* register and we are done */ 587 ret = devm_spi_register_master(dev, master); 588 if (ret) { 589 dev_err(dev, "spi register failed\n"); 590 goto out_clk_disable; 591 } 592 593 dev_info(dev, "at %pr (irq %d, FIFOs size %d)\n", 594 r, irq, bs->fifo_size); 595 596 return 0; 597 598 out_clk_disable: 599 clk_disable_unprepare(clk); 600 out_err: 601 spi_master_put(master); 602 return ret; 603 } 604 605 static int bcm63xx_spi_remove(struct platform_device *pdev) 606 { 607 struct spi_master *master = platform_get_drvdata(pdev); 608 struct bcm63xx_spi *bs = spi_master_get_devdata(master); 609 610 /* reset spi block */ 611 bcm_spi_writeb(bs, 0, SPI_INT_MASK); 612 613 /* HW shutdown */ 614 clk_disable_unprepare(bs->clk); 615 616 return 0; 617 } 618 619 #ifdef CONFIG_PM_SLEEP 620 static int bcm63xx_spi_suspend(struct device *dev) 621 { 622 struct spi_master *master = dev_get_drvdata(dev); 623 struct bcm63xx_spi *bs = spi_master_get_devdata(master); 624 625 spi_master_suspend(master); 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_master *master = dev_get_drvdata(dev); 635 struct bcm63xx_spi *bs = spi_master_get_devdata(master); 636 int ret; 637 638 ret = clk_prepare_enable(bs->clk); 639 if (ret) 640 return ret; 641 642 spi_master_resume(master); 643 644 return 0; 645 } 646 #endif 647 648 static const struct dev_pm_ops bcm63xx_spi_pm_ops = { 649 SET_SYSTEM_SLEEP_PM_OPS(bcm63xx_spi_suspend, bcm63xx_spi_resume) 650 }; 651 652 static struct platform_driver bcm63xx_spi_driver = { 653 .driver = { 654 .name = "bcm63xx-spi", 655 .pm = &bcm63xx_spi_pm_ops, 656 .of_match_table = bcm63xx_spi_of_match, 657 }, 658 .id_table = bcm63xx_spi_dev_match, 659 .probe = bcm63xx_spi_probe, 660 .remove = bcm63xx_spi_remove, 661 }; 662 663 module_platform_driver(bcm63xx_spi_driver); 664 665 MODULE_ALIAS("platform:bcm63xx_spi"); 666 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); 667 MODULE_AUTHOR("Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>"); 668 MODULE_DESCRIPTION("Broadcom BCM63xx SPI Controller driver"); 669 MODULE_LICENSE("GPL"); 670