1 /* 2 * Broadcom BCM63xx SPI controller support 3 * 4 * Copyright (C) 2009-2012 Florian Fainelli <florian@openwrt.org> 5 * Copyright (C) 2010 Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 2 10 * of the License, or (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 */ 17 18 #include <linux/kernel.h> 19 #include <linux/clk.h> 20 #include <linux/io.h> 21 #include <linux/module.h> 22 #include <linux/platform_device.h> 23 #include <linux/delay.h> 24 #include <linux/interrupt.h> 25 #include <linux/spi/spi.h> 26 #include <linux/completion.h> 27 #include <linux/err.h> 28 #include <linux/pm_runtime.h> 29 #include <linux/of.h> 30 31 /* BCM 6338/6348 SPI core */ 32 #define SPI_6348_RSET_SIZE 64 33 #define SPI_6348_CMD 0x00 /* 16-bits register */ 34 #define SPI_6348_INT_STATUS 0x02 35 #define SPI_6348_INT_MASK_ST 0x03 36 #define SPI_6348_INT_MASK 0x04 37 #define SPI_6348_ST 0x05 38 #define SPI_6348_CLK_CFG 0x06 39 #define SPI_6348_FILL_BYTE 0x07 40 #define SPI_6348_MSG_TAIL 0x09 41 #define SPI_6348_RX_TAIL 0x0b 42 #define SPI_6348_MSG_CTL 0x40 /* 8-bits register */ 43 #define SPI_6348_MSG_CTL_WIDTH 8 44 #define SPI_6348_MSG_DATA 0x41 45 #define SPI_6348_MSG_DATA_SIZE 0x3f 46 #define SPI_6348_RX_DATA 0x80 47 #define SPI_6348_RX_DATA_SIZE 0x3f 48 49 /* BCM 3368/6358/6262/6368 SPI core */ 50 #define SPI_6358_RSET_SIZE 1804 51 #define SPI_6358_MSG_CTL 0x00 /* 16-bits register */ 52 #define SPI_6358_MSG_CTL_WIDTH 16 53 #define SPI_6358_MSG_DATA 0x02 54 #define SPI_6358_MSG_DATA_SIZE 0x21e 55 #define SPI_6358_RX_DATA 0x400 56 #define SPI_6358_RX_DATA_SIZE 0x220 57 #define SPI_6358_CMD 0x700 /* 16-bits register */ 58 #define SPI_6358_INT_STATUS 0x702 59 #define SPI_6358_INT_MASK_ST 0x703 60 #define SPI_6358_INT_MASK 0x704 61 #define SPI_6358_ST 0x705 62 #define SPI_6358_CLK_CFG 0x706 63 #define SPI_6358_FILL_BYTE 0x707 64 #define SPI_6358_MSG_TAIL 0x709 65 #define SPI_6358_RX_TAIL 0x70B 66 67 /* Shared SPI definitions */ 68 69 /* Message configuration */ 70 #define SPI_FD_RW 0x00 71 #define SPI_HD_W 0x01 72 #define SPI_HD_R 0x02 73 #define SPI_BYTE_CNT_SHIFT 0 74 #define SPI_6348_MSG_TYPE_SHIFT 6 75 #define SPI_6358_MSG_TYPE_SHIFT 14 76 77 /* Command */ 78 #define SPI_CMD_NOOP 0x00 79 #define SPI_CMD_SOFT_RESET 0x01 80 #define SPI_CMD_HARD_RESET 0x02 81 #define SPI_CMD_START_IMMEDIATE 0x03 82 #define SPI_CMD_COMMAND_SHIFT 0 83 #define SPI_CMD_COMMAND_MASK 0x000f 84 #define SPI_CMD_DEVICE_ID_SHIFT 4 85 #define SPI_CMD_PREPEND_BYTE_CNT_SHIFT 8 86 #define SPI_CMD_ONE_BYTE_SHIFT 11 87 #define SPI_CMD_ONE_WIRE_SHIFT 12 88 #define SPI_DEV_ID_0 0 89 #define SPI_DEV_ID_1 1 90 #define SPI_DEV_ID_2 2 91 #define SPI_DEV_ID_3 3 92 93 /* Interrupt mask */ 94 #define SPI_INTR_CMD_DONE 0x01 95 #define SPI_INTR_RX_OVERFLOW 0x02 96 #define SPI_INTR_TX_UNDERFLOW 0x04 97 #define SPI_INTR_TX_OVERFLOW 0x08 98 #define SPI_INTR_RX_UNDERFLOW 0x10 99 #define SPI_INTR_CLEAR_ALL 0x1f 100 101 /* Status */ 102 #define SPI_RX_EMPTY 0x02 103 #define SPI_CMD_BUSY 0x04 104 #define SPI_SERIAL_BUSY 0x08 105 106 /* Clock configuration */ 107 #define SPI_CLK_20MHZ 0x00 108 #define SPI_CLK_0_391MHZ 0x01 109 #define SPI_CLK_0_781MHZ 0x02 /* default */ 110 #define SPI_CLK_1_563MHZ 0x03 111 #define SPI_CLK_3_125MHZ 0x04 112 #define SPI_CLK_6_250MHZ 0x05 113 #define SPI_CLK_12_50MHZ 0x06 114 #define SPI_CLK_MASK 0x07 115 #define SPI_SSOFFTIME_MASK 0x38 116 #define SPI_SSOFFTIME_SHIFT 3 117 #define SPI_BYTE_SWAP 0x80 118 119 enum bcm63xx_regs_spi { 120 SPI_CMD, 121 SPI_INT_STATUS, 122 SPI_INT_MASK_ST, 123 SPI_INT_MASK, 124 SPI_ST, 125 SPI_CLK_CFG, 126 SPI_FILL_BYTE, 127 SPI_MSG_TAIL, 128 SPI_RX_TAIL, 129 SPI_MSG_CTL, 130 SPI_MSG_DATA, 131 SPI_RX_DATA, 132 SPI_MSG_TYPE_SHIFT, 133 SPI_MSG_CTL_WIDTH, 134 SPI_MSG_DATA_SIZE, 135 }; 136 137 #define BCM63XX_SPI_MAX_PREPEND 15 138 139 #define BCM63XX_SPI_MAX_CS 8 140 #define BCM63XX_SPI_BUS_NUM 0 141 142 struct bcm63xx_spi { 143 struct completion done; 144 145 void __iomem *regs; 146 int irq; 147 148 /* Platform data */ 149 const unsigned long *reg_offsets; 150 unsigned fifo_size; 151 unsigned int msg_type_shift; 152 unsigned int msg_ctl_width; 153 154 /* data iomem */ 155 u8 __iomem *tx_io; 156 const u8 __iomem *rx_io; 157 158 struct clk *clk; 159 struct platform_device *pdev; 160 }; 161 162 static inline u8 bcm_spi_readb(struct bcm63xx_spi *bs, 163 unsigned int offset) 164 { 165 return readb(bs->regs + bs->reg_offsets[offset]); 166 } 167 168 static inline u16 bcm_spi_readw(struct bcm63xx_spi *bs, 169 unsigned int offset) 170 { 171 #ifdef CONFIG_CPU_BIG_ENDIAN 172 return ioread16be(bs->regs + bs->reg_offsets[offset]); 173 #else 174 return readw(bs->regs + bs->reg_offsets[offset]); 175 #endif 176 } 177 178 static inline void bcm_spi_writeb(struct bcm63xx_spi *bs, 179 u8 value, unsigned int offset) 180 { 181 writeb(value, bs->regs + bs->reg_offsets[offset]); 182 } 183 184 static inline void bcm_spi_writew(struct bcm63xx_spi *bs, 185 u16 value, unsigned int offset) 186 { 187 #ifdef CONFIG_CPU_BIG_ENDIAN 188 iowrite16be(value, bs->regs + bs->reg_offsets[offset]); 189 #else 190 writew(value, bs->regs + bs->reg_offsets[offset]); 191 #endif 192 } 193 194 static const unsigned bcm63xx_spi_freq_table[SPI_CLK_MASK][2] = { 195 { 20000000, SPI_CLK_20MHZ }, 196 { 12500000, SPI_CLK_12_50MHZ }, 197 { 6250000, SPI_CLK_6_250MHZ }, 198 { 3125000, SPI_CLK_3_125MHZ }, 199 { 1563000, SPI_CLK_1_563MHZ }, 200 { 781000, SPI_CLK_0_781MHZ }, 201 { 391000, SPI_CLK_0_391MHZ } 202 }; 203 204 static void bcm63xx_spi_setup_transfer(struct spi_device *spi, 205 struct spi_transfer *t) 206 { 207 struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); 208 u8 clk_cfg, reg; 209 int i; 210 211 /* Default to lowest clock configuration */ 212 clk_cfg = SPI_CLK_0_391MHZ; 213 214 /* Find the closest clock configuration */ 215 for (i = 0; i < SPI_CLK_MASK; i++) { 216 if (t->speed_hz >= bcm63xx_spi_freq_table[i][0]) { 217 clk_cfg = bcm63xx_spi_freq_table[i][1]; 218 break; 219 } 220 } 221 222 /* clear existing clock configuration bits of the register */ 223 reg = bcm_spi_readb(bs, SPI_CLK_CFG); 224 reg &= ~SPI_CLK_MASK; 225 reg |= clk_cfg; 226 227 bcm_spi_writeb(bs, reg, SPI_CLK_CFG); 228 dev_dbg(&spi->dev, "Setting clock register to %02x (hz %d)\n", 229 clk_cfg, t->speed_hz); 230 } 231 232 /* the spi->mode bits understood by this driver: */ 233 #define MODEBITS (SPI_CPOL | SPI_CPHA) 234 235 static int bcm63xx_txrx_bufs(struct spi_device *spi, struct spi_transfer *first, 236 unsigned int num_transfers) 237 { 238 struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); 239 u16 msg_ctl; 240 u16 cmd; 241 unsigned int i, timeout = 0, prepend_len = 0, len = 0; 242 struct spi_transfer *t = first; 243 bool do_rx = false; 244 bool do_tx = false; 245 246 /* Disable the CMD_DONE interrupt */ 247 bcm_spi_writeb(bs, 0, SPI_INT_MASK); 248 249 dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n", 250 t->tx_buf, t->rx_buf, t->len); 251 252 if (num_transfers > 1 && t->tx_buf && t->len <= BCM63XX_SPI_MAX_PREPEND) 253 prepend_len = t->len; 254 255 /* prepare the buffer */ 256 for (i = 0; i < num_transfers; i++) { 257 if (t->tx_buf) { 258 do_tx = true; 259 memcpy_toio(bs->tx_io + len, t->tx_buf, t->len); 260 261 /* don't prepend more than one tx */ 262 if (t != first) 263 prepend_len = 0; 264 } 265 266 if (t->rx_buf) { 267 do_rx = true; 268 /* prepend is half-duplex write only */ 269 if (t == first) 270 prepend_len = 0; 271 } 272 273 len += t->len; 274 275 t = list_entry(t->transfer_list.next, struct spi_transfer, 276 transfer_list); 277 } 278 279 reinit_completion(&bs->done); 280 281 /* Fill in the Message control register */ 282 msg_ctl = (len << SPI_BYTE_CNT_SHIFT); 283 284 if (do_rx && do_tx && prepend_len == 0) 285 msg_ctl |= (SPI_FD_RW << bs->msg_type_shift); 286 else if (do_rx) 287 msg_ctl |= (SPI_HD_R << bs->msg_type_shift); 288 else if (do_tx) 289 msg_ctl |= (SPI_HD_W << bs->msg_type_shift); 290 291 switch (bs->msg_ctl_width) { 292 case 8: 293 bcm_spi_writeb(bs, msg_ctl, SPI_MSG_CTL); 294 break; 295 case 16: 296 bcm_spi_writew(bs, msg_ctl, SPI_MSG_CTL); 297 break; 298 } 299 300 /* Issue the transfer */ 301 cmd = SPI_CMD_START_IMMEDIATE; 302 cmd |= (prepend_len << SPI_CMD_PREPEND_BYTE_CNT_SHIFT); 303 cmd |= (spi->chip_select << SPI_CMD_DEVICE_ID_SHIFT); 304 bcm_spi_writew(bs, cmd, SPI_CMD); 305 306 /* Enable the CMD_DONE interrupt */ 307 bcm_spi_writeb(bs, SPI_INTR_CMD_DONE, SPI_INT_MASK); 308 309 timeout = wait_for_completion_timeout(&bs->done, HZ); 310 if (!timeout) 311 return -ETIMEDOUT; 312 313 if (!do_rx) 314 return 0; 315 316 len = 0; 317 t = first; 318 /* Read out all the data */ 319 for (i = 0; i < num_transfers; i++) { 320 if (t->rx_buf) 321 memcpy_fromio(t->rx_buf, bs->rx_io + len, t->len); 322 323 if (t != first || prepend_len == 0) 324 len += t->len; 325 326 t = list_entry(t->transfer_list.next, struct spi_transfer, 327 transfer_list); 328 } 329 330 return 0; 331 } 332 333 static int bcm63xx_spi_transfer_one(struct spi_master *master, 334 struct spi_message *m) 335 { 336 struct bcm63xx_spi *bs = spi_master_get_devdata(master); 337 struct spi_transfer *t, *first = NULL; 338 struct spi_device *spi = m->spi; 339 int status = 0; 340 unsigned int n_transfers = 0, total_len = 0; 341 bool can_use_prepend = false; 342 343 /* 344 * This SPI controller does not support keeping CS active after a 345 * transfer. 346 * Work around this by merging as many transfers we can into one big 347 * full-duplex transfers. 348 */ 349 list_for_each_entry(t, &m->transfers, transfer_list) { 350 if (!first) 351 first = t; 352 353 n_transfers++; 354 total_len += t->len; 355 356 if (n_transfers == 2 && !first->rx_buf && !t->tx_buf && 357 first->len <= BCM63XX_SPI_MAX_PREPEND) 358 can_use_prepend = true; 359 else if (can_use_prepend && t->tx_buf) 360 can_use_prepend = false; 361 362 /* we can only transfer one fifo worth of data */ 363 if ((can_use_prepend && 364 total_len > (bs->fifo_size + BCM63XX_SPI_MAX_PREPEND)) || 365 (!can_use_prepend && total_len > bs->fifo_size)) { 366 dev_err(&spi->dev, "unable to do transfers larger than FIFO size (%i > %i)\n", 367 total_len, bs->fifo_size); 368 status = -EINVAL; 369 goto exit; 370 } 371 372 /* all combined transfers have to have the same speed */ 373 if (t->speed_hz != first->speed_hz) { 374 dev_err(&spi->dev, "unable to change speed between transfers\n"); 375 status = -EINVAL; 376 goto exit; 377 } 378 379 /* CS will be deasserted directly after transfer */ 380 if (t->delay_usecs) { 381 dev_err(&spi->dev, "unable to keep CS asserted after transfer\n"); 382 status = -EINVAL; 383 goto exit; 384 } 385 386 if (t->cs_change || 387 list_is_last(&t->transfer_list, &m->transfers)) { 388 /* configure adapter for a new transfer */ 389 bcm63xx_spi_setup_transfer(spi, first); 390 391 /* send the data */ 392 status = bcm63xx_txrx_bufs(spi, first, n_transfers); 393 if (status) 394 goto exit; 395 396 m->actual_length += total_len; 397 398 first = NULL; 399 n_transfers = 0; 400 total_len = 0; 401 can_use_prepend = false; 402 } 403 } 404 exit: 405 m->status = status; 406 spi_finalize_current_message(master); 407 408 return 0; 409 } 410 411 /* This driver supports single master mode only. Hence 412 * CMD_DONE is the only interrupt we care about 413 */ 414 static irqreturn_t bcm63xx_spi_interrupt(int irq, void *dev_id) 415 { 416 struct spi_master *master = (struct spi_master *)dev_id; 417 struct bcm63xx_spi *bs = spi_master_get_devdata(master); 418 u8 intr; 419 420 /* Read interupts and clear them immediately */ 421 intr = bcm_spi_readb(bs, SPI_INT_STATUS); 422 bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS); 423 bcm_spi_writeb(bs, 0, SPI_INT_MASK); 424 425 /* A transfer completed */ 426 if (intr & SPI_INTR_CMD_DONE) 427 complete(&bs->done); 428 429 return IRQ_HANDLED; 430 } 431 432 static size_t bcm63xx_spi_max_length(struct spi_device *spi) 433 { 434 struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); 435 436 return bs->fifo_size; 437 } 438 439 static const unsigned long bcm6348_spi_reg_offsets[] = { 440 [SPI_CMD] = SPI_6348_CMD, 441 [SPI_INT_STATUS] = SPI_6348_INT_STATUS, 442 [SPI_INT_MASK_ST] = SPI_6348_INT_MASK_ST, 443 [SPI_INT_MASK] = SPI_6348_INT_MASK, 444 [SPI_ST] = SPI_6348_ST, 445 [SPI_CLK_CFG] = SPI_6348_CLK_CFG, 446 [SPI_FILL_BYTE] = SPI_6348_FILL_BYTE, 447 [SPI_MSG_TAIL] = SPI_6348_MSG_TAIL, 448 [SPI_RX_TAIL] = SPI_6348_RX_TAIL, 449 [SPI_MSG_CTL] = SPI_6348_MSG_CTL, 450 [SPI_MSG_DATA] = SPI_6348_MSG_DATA, 451 [SPI_RX_DATA] = SPI_6348_RX_DATA, 452 [SPI_MSG_TYPE_SHIFT] = SPI_6348_MSG_TYPE_SHIFT, 453 [SPI_MSG_CTL_WIDTH] = SPI_6348_MSG_CTL_WIDTH, 454 [SPI_MSG_DATA_SIZE] = SPI_6348_MSG_DATA_SIZE, 455 }; 456 457 static const unsigned long bcm6358_spi_reg_offsets[] = { 458 [SPI_CMD] = SPI_6358_CMD, 459 [SPI_INT_STATUS] = SPI_6358_INT_STATUS, 460 [SPI_INT_MASK_ST] = SPI_6358_INT_MASK_ST, 461 [SPI_INT_MASK] = SPI_6358_INT_MASK, 462 [SPI_ST] = SPI_6358_ST, 463 [SPI_CLK_CFG] = SPI_6358_CLK_CFG, 464 [SPI_FILL_BYTE] = SPI_6358_FILL_BYTE, 465 [SPI_MSG_TAIL] = SPI_6358_MSG_TAIL, 466 [SPI_RX_TAIL] = SPI_6358_RX_TAIL, 467 [SPI_MSG_CTL] = SPI_6358_MSG_CTL, 468 [SPI_MSG_DATA] = SPI_6358_MSG_DATA, 469 [SPI_RX_DATA] = SPI_6358_RX_DATA, 470 [SPI_MSG_TYPE_SHIFT] = SPI_6358_MSG_TYPE_SHIFT, 471 [SPI_MSG_CTL_WIDTH] = SPI_6358_MSG_CTL_WIDTH, 472 [SPI_MSG_DATA_SIZE] = SPI_6358_MSG_DATA_SIZE, 473 }; 474 475 static const struct platform_device_id bcm63xx_spi_dev_match[] = { 476 { 477 .name = "bcm6348-spi", 478 .driver_data = (unsigned long)bcm6348_spi_reg_offsets, 479 }, 480 { 481 .name = "bcm6358-spi", 482 .driver_data = (unsigned long)bcm6358_spi_reg_offsets, 483 }, 484 { 485 }, 486 }; 487 488 static const struct of_device_id bcm63xx_spi_of_match[] = { 489 { .compatible = "brcm,bcm6348-spi", .data = &bcm6348_spi_reg_offsets }, 490 { .compatible = "brcm,bcm6358-spi", .data = &bcm6358_spi_reg_offsets }, 491 { }, 492 }; 493 494 static int bcm63xx_spi_probe(struct platform_device *pdev) 495 { 496 struct resource *r; 497 const unsigned long *bcm63xx_spireg; 498 struct device *dev = &pdev->dev; 499 int irq, bus_num; 500 struct spi_master *master; 501 struct clk *clk; 502 struct bcm63xx_spi *bs; 503 int ret; 504 u32 num_cs = BCM63XX_SPI_MAX_CS; 505 506 if (dev->of_node) { 507 const struct of_device_id *match; 508 509 match = of_match_node(bcm63xx_spi_of_match, dev->of_node); 510 if (!match) 511 return -EINVAL; 512 bcm63xx_spireg = match->data; 513 514 of_property_read_u32(dev->of_node, "num-cs", &num_cs); 515 if (num_cs > BCM63XX_SPI_MAX_CS) { 516 dev_warn(dev, "unsupported number of cs (%i), reducing to 8\n", 517 num_cs); 518 num_cs = BCM63XX_SPI_MAX_CS; 519 } 520 521 bus_num = -1; 522 } else if (pdev->id_entry->driver_data) { 523 const struct platform_device_id *match = pdev->id_entry; 524 525 bcm63xx_spireg = (const unsigned long *)match->driver_data; 526 bus_num = BCM63XX_SPI_BUS_NUM; 527 } else { 528 return -EINVAL; 529 } 530 531 irq = platform_get_irq(pdev, 0); 532 if (irq < 0) { 533 dev_err(dev, "no irq\n"); 534 return -ENXIO; 535 } 536 537 clk = devm_clk_get(dev, "spi"); 538 if (IS_ERR(clk)) { 539 dev_err(dev, "no clock for device\n"); 540 return PTR_ERR(clk); 541 } 542 543 master = spi_alloc_master(dev, sizeof(*bs)); 544 if (!master) { 545 dev_err(dev, "out of memory\n"); 546 return -ENOMEM; 547 } 548 549 bs = spi_master_get_devdata(master); 550 init_completion(&bs->done); 551 552 platform_set_drvdata(pdev, master); 553 bs->pdev = pdev; 554 555 r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 556 bs->regs = devm_ioremap_resource(&pdev->dev, r); 557 if (IS_ERR(bs->regs)) { 558 ret = PTR_ERR(bs->regs); 559 goto out_err; 560 } 561 562 bs->irq = irq; 563 bs->clk = clk; 564 bs->reg_offsets = bcm63xx_spireg; 565 bs->fifo_size = bs->reg_offsets[SPI_MSG_DATA_SIZE]; 566 567 ret = devm_request_irq(&pdev->dev, irq, bcm63xx_spi_interrupt, 0, 568 pdev->name, master); 569 if (ret) { 570 dev_err(dev, "unable to request irq\n"); 571 goto out_err; 572 } 573 574 master->dev.of_node = dev->of_node; 575 master->bus_num = bus_num; 576 master->num_chipselect = num_cs; 577 master->transfer_one_message = bcm63xx_spi_transfer_one; 578 master->mode_bits = MODEBITS; 579 master->bits_per_word_mask = SPI_BPW_MASK(8); 580 master->max_transfer_size = bcm63xx_spi_max_length; 581 master->max_message_size = bcm63xx_spi_max_length; 582 master->auto_runtime_pm = true; 583 bs->msg_type_shift = bs->reg_offsets[SPI_MSG_TYPE_SHIFT]; 584 bs->msg_ctl_width = bs->reg_offsets[SPI_MSG_CTL_WIDTH]; 585 bs->tx_io = (u8 *)(bs->regs + bs->reg_offsets[SPI_MSG_DATA]); 586 bs->rx_io = (const u8 *)(bs->regs + bs->reg_offsets[SPI_RX_DATA]); 587 588 /* Initialize hardware */ 589 ret = clk_prepare_enable(bs->clk); 590 if (ret) 591 goto out_err; 592 593 bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS); 594 595 /* register and we are done */ 596 ret = devm_spi_register_master(dev, master); 597 if (ret) { 598 dev_err(dev, "spi register failed\n"); 599 goto out_clk_disable; 600 } 601 602 dev_info(dev, "at %pr (irq %d, FIFOs size %d)\n", 603 r, irq, bs->fifo_size); 604 605 return 0; 606 607 out_clk_disable: 608 clk_disable_unprepare(clk); 609 out_err: 610 spi_master_put(master); 611 return ret; 612 } 613 614 static int bcm63xx_spi_remove(struct platform_device *pdev) 615 { 616 struct spi_master *master = platform_get_drvdata(pdev); 617 struct bcm63xx_spi *bs = spi_master_get_devdata(master); 618 619 /* reset spi block */ 620 bcm_spi_writeb(bs, 0, SPI_INT_MASK); 621 622 /* HW shutdown */ 623 clk_disable_unprepare(bs->clk); 624 625 return 0; 626 } 627 628 #ifdef CONFIG_PM_SLEEP 629 static int bcm63xx_spi_suspend(struct device *dev) 630 { 631 struct spi_master *master = dev_get_drvdata(dev); 632 struct bcm63xx_spi *bs = spi_master_get_devdata(master); 633 634 spi_master_suspend(master); 635 636 clk_disable_unprepare(bs->clk); 637 638 return 0; 639 } 640 641 static int bcm63xx_spi_resume(struct device *dev) 642 { 643 struct spi_master *master = dev_get_drvdata(dev); 644 struct bcm63xx_spi *bs = spi_master_get_devdata(master); 645 int ret; 646 647 ret = clk_prepare_enable(bs->clk); 648 if (ret) 649 return ret; 650 651 spi_master_resume(master); 652 653 return 0; 654 } 655 #endif 656 657 static const struct dev_pm_ops bcm63xx_spi_pm_ops = { 658 SET_SYSTEM_SLEEP_PM_OPS(bcm63xx_spi_suspend, bcm63xx_spi_resume) 659 }; 660 661 static struct platform_driver bcm63xx_spi_driver = { 662 .driver = { 663 .name = "bcm63xx-spi", 664 .pm = &bcm63xx_spi_pm_ops, 665 .of_match_table = bcm63xx_spi_of_match, 666 }, 667 .id_table = bcm63xx_spi_dev_match, 668 .probe = bcm63xx_spi_probe, 669 .remove = bcm63xx_spi_remove, 670 }; 671 672 module_platform_driver(bcm63xx_spi_driver); 673 674 MODULE_ALIAS("platform:bcm63xx_spi"); 675 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); 676 MODULE_AUTHOR("Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>"); 677 MODULE_DESCRIPTION("Broadcom BCM63xx SPI Controller driver"); 678 MODULE_LICENSE("GPL"); 679