1 /* 2 * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd 3 * Author: Addy Ke <addy.ke@rock-chips.com> 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms and conditions of the GNU General Public License, 7 * version 2, as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 */ 15 16 #include <linux/init.h> 17 #include <linux/module.h> 18 #include <linux/clk.h> 19 #include <linux/err.h> 20 #include <linux/delay.h> 21 #include <linux/interrupt.h> 22 #include <linux/platform_device.h> 23 #include <linux/slab.h> 24 #include <linux/spi/spi.h> 25 #include <linux/scatterlist.h> 26 #include <linux/of.h> 27 #include <linux/pm_runtime.h> 28 #include <linux/io.h> 29 #include <linux/dmaengine.h> 30 31 #define DRIVER_NAME "rockchip-spi" 32 33 /* SPI register offsets */ 34 #define ROCKCHIP_SPI_CTRLR0 0x0000 35 #define ROCKCHIP_SPI_CTRLR1 0x0004 36 #define ROCKCHIP_SPI_SSIENR 0x0008 37 #define ROCKCHIP_SPI_SER 0x000c 38 #define ROCKCHIP_SPI_BAUDR 0x0010 39 #define ROCKCHIP_SPI_TXFTLR 0x0014 40 #define ROCKCHIP_SPI_RXFTLR 0x0018 41 #define ROCKCHIP_SPI_TXFLR 0x001c 42 #define ROCKCHIP_SPI_RXFLR 0x0020 43 #define ROCKCHIP_SPI_SR 0x0024 44 #define ROCKCHIP_SPI_IPR 0x0028 45 #define ROCKCHIP_SPI_IMR 0x002c 46 #define ROCKCHIP_SPI_ISR 0x0030 47 #define ROCKCHIP_SPI_RISR 0x0034 48 #define ROCKCHIP_SPI_ICR 0x0038 49 #define ROCKCHIP_SPI_DMACR 0x003c 50 #define ROCKCHIP_SPI_DMATDLR 0x0040 51 #define ROCKCHIP_SPI_DMARDLR 0x0044 52 #define ROCKCHIP_SPI_TXDR 0x0400 53 #define ROCKCHIP_SPI_RXDR 0x0800 54 55 /* Bit fields in CTRLR0 */ 56 #define CR0_DFS_OFFSET 0 57 58 #define CR0_CFS_OFFSET 2 59 60 #define CR0_SCPH_OFFSET 6 61 62 #define CR0_SCPOL_OFFSET 7 63 64 #define CR0_CSM_OFFSET 8 65 #define CR0_CSM_KEEP 0x0 66 /* ss_n be high for half sclk_out cycles */ 67 #define CR0_CSM_HALF 0X1 68 /* ss_n be high for one sclk_out cycle */ 69 #define CR0_CSM_ONE 0x2 70 71 /* ss_n to sclk_out delay */ 72 #define CR0_SSD_OFFSET 10 73 /* 74 * The period between ss_n active and 75 * sclk_out active is half sclk_out cycles 76 */ 77 #define CR0_SSD_HALF 0x0 78 /* 79 * The period between ss_n active and 80 * sclk_out active is one sclk_out cycle 81 */ 82 #define CR0_SSD_ONE 0x1 83 84 #define CR0_EM_OFFSET 11 85 #define CR0_EM_LITTLE 0x0 86 #define CR0_EM_BIG 0x1 87 88 #define CR0_FBM_OFFSET 12 89 #define CR0_FBM_MSB 0x0 90 #define CR0_FBM_LSB 0x1 91 92 #define CR0_BHT_OFFSET 13 93 #define CR0_BHT_16BIT 0x0 94 #define CR0_BHT_8BIT 0x1 95 96 #define CR0_RSD_OFFSET 14 97 98 #define CR0_FRF_OFFSET 16 99 #define CR0_FRF_SPI 0x0 100 #define CR0_FRF_SSP 0x1 101 #define CR0_FRF_MICROWIRE 0x2 102 103 #define CR0_XFM_OFFSET 18 104 #define CR0_XFM_MASK (0x03 << SPI_XFM_OFFSET) 105 #define CR0_XFM_TR 0x0 106 #define CR0_XFM_TO 0x1 107 #define CR0_XFM_RO 0x2 108 109 #define CR0_OPM_OFFSET 20 110 #define CR0_OPM_MASTER 0x0 111 #define CR0_OPM_SLAVE 0x1 112 113 #define CR0_MTM_OFFSET 0x21 114 115 /* Bit fields in SER, 2bit */ 116 #define SER_MASK 0x3 117 118 /* Bit fields in SR, 5bit */ 119 #define SR_MASK 0x1f 120 #define SR_BUSY (1 << 0) 121 #define SR_TF_FULL (1 << 1) 122 #define SR_TF_EMPTY (1 << 2) 123 #define SR_RF_EMPTY (1 << 3) 124 #define SR_RF_FULL (1 << 4) 125 126 /* Bit fields in ISR, IMR, ISR, RISR, 5bit */ 127 #define INT_MASK 0x1f 128 #define INT_TF_EMPTY (1 << 0) 129 #define INT_TF_OVERFLOW (1 << 1) 130 #define INT_RF_UNDERFLOW (1 << 2) 131 #define INT_RF_OVERFLOW (1 << 3) 132 #define INT_RF_FULL (1 << 4) 133 134 /* Bit fields in ICR, 4bit */ 135 #define ICR_MASK 0x0f 136 #define ICR_ALL (1 << 0) 137 #define ICR_RF_UNDERFLOW (1 << 1) 138 #define ICR_RF_OVERFLOW (1 << 2) 139 #define ICR_TF_OVERFLOW (1 << 3) 140 141 /* Bit fields in DMACR */ 142 #define RF_DMA_EN (1 << 0) 143 #define TF_DMA_EN (1 << 1) 144 145 #define RXBUSY (1 << 0) 146 #define TXBUSY (1 << 1) 147 148 enum rockchip_ssi_type { 149 SSI_MOTO_SPI = 0, 150 SSI_TI_SSP, 151 SSI_NS_MICROWIRE, 152 }; 153 154 struct rockchip_spi_dma_data { 155 struct dma_chan *ch; 156 enum dma_transfer_direction direction; 157 dma_addr_t addr; 158 }; 159 160 struct rockchip_spi { 161 struct device *dev; 162 struct spi_master *master; 163 164 struct clk *spiclk; 165 struct clk *apb_pclk; 166 167 void __iomem *regs; 168 /*depth of the FIFO buffer */ 169 u32 fifo_len; 170 /* max bus freq supported */ 171 u32 max_freq; 172 /* supported slave numbers */ 173 enum rockchip_ssi_type type; 174 175 u16 mode; 176 u8 tmode; 177 u8 bpw; 178 u8 n_bytes; 179 unsigned len; 180 u32 speed; 181 182 const void *tx; 183 const void *tx_end; 184 void *rx; 185 void *rx_end; 186 187 u32 state; 188 /* protect state */ 189 spinlock_t lock; 190 191 struct completion xfer_completion; 192 193 u32 use_dma; 194 struct sg_table tx_sg; 195 struct sg_table rx_sg; 196 struct rockchip_spi_dma_data dma_rx; 197 struct rockchip_spi_dma_data dma_tx; 198 }; 199 200 static inline void spi_enable_chip(struct rockchip_spi *rs, int enable) 201 { 202 writel_relaxed((enable ? 1 : 0), rs->regs + ROCKCHIP_SPI_SSIENR); 203 } 204 205 static inline void spi_set_clk(struct rockchip_spi *rs, u16 div) 206 { 207 writel_relaxed(div, rs->regs + ROCKCHIP_SPI_BAUDR); 208 } 209 210 static inline void flush_fifo(struct rockchip_spi *rs) 211 { 212 while (readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR)) 213 readl_relaxed(rs->regs + ROCKCHIP_SPI_RXDR); 214 } 215 216 static inline void wait_for_idle(struct rockchip_spi *rs) 217 { 218 unsigned long timeout = jiffies + msecs_to_jiffies(5); 219 220 do { 221 if (!(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY)) 222 return; 223 } while (!time_after(jiffies, timeout)); 224 225 dev_warn(rs->dev, "spi controller is in busy state!\n"); 226 } 227 228 static u32 get_fifo_len(struct rockchip_spi *rs) 229 { 230 u32 fifo; 231 232 for (fifo = 2; fifo < 32; fifo++) { 233 writel_relaxed(fifo, rs->regs + ROCKCHIP_SPI_TXFTLR); 234 if (fifo != readl_relaxed(rs->regs + ROCKCHIP_SPI_TXFTLR)) 235 break; 236 } 237 238 writel_relaxed(0, rs->regs + ROCKCHIP_SPI_TXFTLR); 239 240 return (fifo == 31) ? 0 : fifo; 241 } 242 243 static inline u32 tx_max(struct rockchip_spi *rs) 244 { 245 u32 tx_left, tx_room; 246 247 tx_left = (rs->tx_end - rs->tx) / rs->n_bytes; 248 tx_room = rs->fifo_len - readl_relaxed(rs->regs + ROCKCHIP_SPI_TXFLR); 249 250 return min(tx_left, tx_room); 251 } 252 253 static inline u32 rx_max(struct rockchip_spi *rs) 254 { 255 u32 rx_left = (rs->rx_end - rs->rx) / rs->n_bytes; 256 u32 rx_room = (u32)readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR); 257 258 return min(rx_left, rx_room); 259 } 260 261 static void rockchip_spi_set_cs(struct spi_device *spi, bool enable) 262 { 263 u32 ser; 264 struct rockchip_spi *rs = spi_master_get_devdata(spi->master); 265 266 ser = readl_relaxed(rs->regs + ROCKCHIP_SPI_SER) & SER_MASK; 267 268 /* 269 * drivers/spi/spi.c: 270 * static void spi_set_cs(struct spi_device *spi, bool enable) 271 * { 272 * if (spi->mode & SPI_CS_HIGH) 273 * enable = !enable; 274 * 275 * if (spi->cs_gpio >= 0) 276 * gpio_set_value(spi->cs_gpio, !enable); 277 * else if (spi->master->set_cs) 278 * spi->master->set_cs(spi, !enable); 279 * } 280 * 281 * Note: enable(rockchip_spi_set_cs) = !enable(spi_set_cs) 282 */ 283 if (!enable) 284 ser |= 1 << spi->chip_select; 285 else 286 ser &= ~(1 << spi->chip_select); 287 288 writel_relaxed(ser, rs->regs + ROCKCHIP_SPI_SER); 289 } 290 291 static int rockchip_spi_prepare_message(struct spi_master *master, 292 struct spi_message *msg) 293 { 294 struct rockchip_spi *rs = spi_master_get_devdata(master); 295 struct spi_device *spi = msg->spi; 296 297 rs->mode = spi->mode; 298 299 return 0; 300 } 301 302 static int rockchip_spi_unprepare_message(struct spi_master *master, 303 struct spi_message *msg) 304 { 305 unsigned long flags; 306 struct rockchip_spi *rs = spi_master_get_devdata(master); 307 308 spin_lock_irqsave(&rs->lock, flags); 309 310 /* 311 * For DMA mode, we need terminate DMA channel and flush 312 * fifo for the next transfer if DMA thansfer timeout. 313 * unprepare_message() was called by core if transfer complete 314 * or timeout. Maybe it is reasonable for error handling here. 315 */ 316 if (rs->use_dma) { 317 if (rs->state & RXBUSY) { 318 dmaengine_terminate_all(rs->dma_rx.ch); 319 flush_fifo(rs); 320 } 321 322 if (rs->state & TXBUSY) 323 dmaengine_terminate_all(rs->dma_tx.ch); 324 } 325 326 spin_unlock_irqrestore(&rs->lock, flags); 327 328 return 0; 329 } 330 331 static void rockchip_spi_pio_writer(struct rockchip_spi *rs) 332 { 333 u32 max = tx_max(rs); 334 u32 txw = 0; 335 336 while (max--) { 337 if (rs->n_bytes == 1) 338 txw = *(u8 *)(rs->tx); 339 else 340 txw = *(u16 *)(rs->tx); 341 342 writel_relaxed(txw, rs->regs + ROCKCHIP_SPI_TXDR); 343 rs->tx += rs->n_bytes; 344 } 345 } 346 347 static void rockchip_spi_pio_reader(struct rockchip_spi *rs) 348 { 349 u32 max = rx_max(rs); 350 u32 rxw; 351 352 while (max--) { 353 rxw = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXDR); 354 if (rs->n_bytes == 1) 355 *(u8 *)(rs->rx) = (u8)rxw; 356 else 357 *(u16 *)(rs->rx) = (u16)rxw; 358 rs->rx += rs->n_bytes; 359 } 360 } 361 362 static int rockchip_spi_pio_transfer(struct rockchip_spi *rs) 363 { 364 int remain = 0; 365 366 do { 367 if (rs->tx) { 368 remain = rs->tx_end - rs->tx; 369 rockchip_spi_pio_writer(rs); 370 } 371 372 if (rs->rx) { 373 remain = rs->rx_end - rs->rx; 374 rockchip_spi_pio_reader(rs); 375 } 376 377 cpu_relax(); 378 } while (remain); 379 380 /* If tx, wait until the FIFO data completely. */ 381 if (rs->tx) 382 wait_for_idle(rs); 383 384 return 0; 385 } 386 387 static void rockchip_spi_dma_rxcb(void *data) 388 { 389 unsigned long flags; 390 struct rockchip_spi *rs = data; 391 392 spin_lock_irqsave(&rs->lock, flags); 393 394 rs->state &= ~RXBUSY; 395 if (!(rs->state & TXBUSY)) 396 spi_finalize_current_transfer(rs->master); 397 398 spin_unlock_irqrestore(&rs->lock, flags); 399 } 400 401 static void rockchip_spi_dma_txcb(void *data) 402 { 403 unsigned long flags; 404 struct rockchip_spi *rs = data; 405 406 /* Wait until the FIFO data completely. */ 407 wait_for_idle(rs); 408 409 spin_lock_irqsave(&rs->lock, flags); 410 411 rs->state &= ~TXBUSY; 412 if (!(rs->state & RXBUSY)) 413 spi_finalize_current_transfer(rs->master); 414 415 spin_unlock_irqrestore(&rs->lock, flags); 416 } 417 418 static void rockchip_spi_prepare_dma(struct rockchip_spi *rs) 419 { 420 unsigned long flags; 421 struct dma_slave_config rxconf, txconf; 422 struct dma_async_tx_descriptor *rxdesc, *txdesc; 423 424 spin_lock_irqsave(&rs->lock, flags); 425 rs->state &= ~RXBUSY; 426 rs->state &= ~TXBUSY; 427 spin_unlock_irqrestore(&rs->lock, flags); 428 429 if (rs->rx) { 430 rxconf.direction = rs->dma_rx.direction; 431 rxconf.src_addr = rs->dma_rx.addr; 432 rxconf.src_addr_width = rs->n_bytes; 433 rxconf.src_maxburst = rs->n_bytes; 434 dmaengine_slave_config(rs->dma_rx.ch, &rxconf); 435 436 rxdesc = dmaengine_prep_slave_sg( 437 rs->dma_rx.ch, 438 rs->rx_sg.sgl, rs->rx_sg.nents, 439 rs->dma_rx.direction, DMA_PREP_INTERRUPT); 440 441 rxdesc->callback = rockchip_spi_dma_rxcb; 442 rxdesc->callback_param = rs; 443 } 444 445 if (rs->tx) { 446 txconf.direction = rs->dma_tx.direction; 447 txconf.dst_addr = rs->dma_tx.addr; 448 txconf.dst_addr_width = rs->n_bytes; 449 txconf.dst_maxburst = rs->n_bytes; 450 dmaengine_slave_config(rs->dma_tx.ch, &txconf); 451 452 txdesc = dmaengine_prep_slave_sg( 453 rs->dma_tx.ch, 454 rs->tx_sg.sgl, rs->tx_sg.nents, 455 rs->dma_tx.direction, DMA_PREP_INTERRUPT); 456 457 txdesc->callback = rockchip_spi_dma_txcb; 458 txdesc->callback_param = rs; 459 } 460 461 /* rx must be started before tx due to spi instinct */ 462 if (rs->rx) { 463 spin_lock_irqsave(&rs->lock, flags); 464 rs->state |= RXBUSY; 465 spin_unlock_irqrestore(&rs->lock, flags); 466 dmaengine_submit(rxdesc); 467 dma_async_issue_pending(rs->dma_rx.ch); 468 } 469 470 if (rs->tx) { 471 spin_lock_irqsave(&rs->lock, flags); 472 rs->state |= TXBUSY; 473 spin_unlock_irqrestore(&rs->lock, flags); 474 dmaengine_submit(txdesc); 475 dma_async_issue_pending(rs->dma_tx.ch); 476 } 477 } 478 479 static void rockchip_spi_config(struct rockchip_spi *rs) 480 { 481 u32 div = 0; 482 u32 dmacr = 0; 483 484 u32 cr0 = (CR0_BHT_8BIT << CR0_BHT_OFFSET) 485 | (CR0_SSD_ONE << CR0_SSD_OFFSET); 486 487 cr0 |= (rs->n_bytes << CR0_DFS_OFFSET); 488 cr0 |= ((rs->mode & 0x3) << CR0_SCPH_OFFSET); 489 cr0 |= (rs->tmode << CR0_XFM_OFFSET); 490 cr0 |= (rs->type << CR0_FRF_OFFSET); 491 492 if (rs->use_dma) { 493 if (rs->tx) 494 dmacr |= TF_DMA_EN; 495 if (rs->rx) 496 dmacr |= RF_DMA_EN; 497 } 498 499 /* div doesn't support odd number */ 500 div = max_t(u32, rs->max_freq / rs->speed, 1); 501 div = (div + 1) & 0xfffe; 502 503 spi_enable_chip(rs, 0); 504 505 writel_relaxed(cr0, rs->regs + ROCKCHIP_SPI_CTRLR0); 506 507 writel_relaxed(rs->len - 1, rs->regs + ROCKCHIP_SPI_CTRLR1); 508 writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_TXFTLR); 509 writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_RXFTLR); 510 511 writel_relaxed(0, rs->regs + ROCKCHIP_SPI_DMATDLR); 512 writel_relaxed(0, rs->regs + ROCKCHIP_SPI_DMARDLR); 513 writel_relaxed(dmacr, rs->regs + ROCKCHIP_SPI_DMACR); 514 515 spi_set_clk(rs, div); 516 517 dev_dbg(rs->dev, "cr0 0x%x, div %d\n", cr0, div); 518 519 spi_enable_chip(rs, 1); 520 } 521 522 static int rockchip_spi_transfer_one( 523 struct spi_master *master, 524 struct spi_device *spi, 525 struct spi_transfer *xfer) 526 { 527 int ret = 0; 528 struct rockchip_spi *rs = spi_master_get_devdata(master); 529 530 WARN_ON(readl_relaxed(rs->regs + ROCKCHIP_SPI_SSIENR) && 531 (readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY)); 532 533 if (!xfer->tx_buf && !xfer->rx_buf) { 534 dev_err(rs->dev, "No buffer for transfer\n"); 535 return -EINVAL; 536 } 537 538 rs->speed = xfer->speed_hz; 539 rs->bpw = xfer->bits_per_word; 540 rs->n_bytes = rs->bpw >> 3; 541 542 rs->tx = xfer->tx_buf; 543 rs->tx_end = rs->tx + xfer->len; 544 rs->rx = xfer->rx_buf; 545 rs->rx_end = rs->rx + xfer->len; 546 rs->len = xfer->len; 547 548 rs->tx_sg = xfer->tx_sg; 549 rs->rx_sg = xfer->rx_sg; 550 551 if (rs->tx && rs->rx) 552 rs->tmode = CR0_XFM_TR; 553 else if (rs->tx) 554 rs->tmode = CR0_XFM_TO; 555 else if (rs->rx) 556 rs->tmode = CR0_XFM_RO; 557 558 /* we need prepare dma before spi was enabled */ 559 if (master->can_dma && master->can_dma(master, spi, xfer)) { 560 rs->use_dma = 1; 561 rockchip_spi_prepare_dma(rs); 562 } else { 563 rs->use_dma = 0; 564 } 565 566 rockchip_spi_config(rs); 567 568 if (!rs->use_dma) 569 ret = rockchip_spi_pio_transfer(rs); 570 571 return ret; 572 } 573 574 static bool rockchip_spi_can_dma(struct spi_master *master, 575 struct spi_device *spi, 576 struct spi_transfer *xfer) 577 { 578 struct rockchip_spi *rs = spi_master_get_devdata(master); 579 580 return (xfer->len > rs->fifo_len); 581 } 582 583 static int rockchip_spi_probe(struct platform_device *pdev) 584 { 585 int ret = 0; 586 struct rockchip_spi *rs; 587 struct spi_master *master; 588 struct resource *mem; 589 590 master = spi_alloc_master(&pdev->dev, sizeof(struct rockchip_spi)); 591 if (!master) 592 return -ENOMEM; 593 594 platform_set_drvdata(pdev, master); 595 596 rs = spi_master_get_devdata(master); 597 memset(rs, 0, sizeof(struct rockchip_spi)); 598 599 /* Get basic io resource and map it */ 600 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 601 rs->regs = devm_ioremap_resource(&pdev->dev, mem); 602 if (IS_ERR(rs->regs)) { 603 ret = PTR_ERR(rs->regs); 604 goto err_ioremap_resource; 605 } 606 607 rs->apb_pclk = devm_clk_get(&pdev->dev, "apb_pclk"); 608 if (IS_ERR(rs->apb_pclk)) { 609 dev_err(&pdev->dev, "Failed to get apb_pclk\n"); 610 ret = PTR_ERR(rs->apb_pclk); 611 goto err_ioremap_resource; 612 } 613 614 rs->spiclk = devm_clk_get(&pdev->dev, "spiclk"); 615 if (IS_ERR(rs->spiclk)) { 616 dev_err(&pdev->dev, "Failed to get spi_pclk\n"); 617 ret = PTR_ERR(rs->spiclk); 618 goto err_ioremap_resource; 619 } 620 621 ret = clk_prepare_enable(rs->apb_pclk); 622 if (ret) { 623 dev_err(&pdev->dev, "Failed to enable apb_pclk\n"); 624 goto err_ioremap_resource; 625 } 626 627 ret = clk_prepare_enable(rs->spiclk); 628 if (ret) { 629 dev_err(&pdev->dev, "Failed to enable spi_clk\n"); 630 goto err_spiclk_enable; 631 } 632 633 spi_enable_chip(rs, 0); 634 635 rs->type = SSI_MOTO_SPI; 636 rs->master = master; 637 rs->dev = &pdev->dev; 638 rs->max_freq = clk_get_rate(rs->spiclk); 639 640 rs->fifo_len = get_fifo_len(rs); 641 if (!rs->fifo_len) { 642 dev_err(&pdev->dev, "Failed to get fifo length\n"); 643 ret = -EINVAL; 644 goto err_get_fifo_len; 645 } 646 647 spin_lock_init(&rs->lock); 648 649 pm_runtime_set_active(&pdev->dev); 650 pm_runtime_enable(&pdev->dev); 651 652 master->auto_runtime_pm = true; 653 master->bus_num = pdev->id; 654 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP; 655 master->num_chipselect = 2; 656 master->dev.of_node = pdev->dev.of_node; 657 master->bits_per_word_mask = SPI_BPW_MASK(16) | SPI_BPW_MASK(8); 658 659 master->set_cs = rockchip_spi_set_cs; 660 master->prepare_message = rockchip_spi_prepare_message; 661 master->unprepare_message = rockchip_spi_unprepare_message; 662 master->transfer_one = rockchip_spi_transfer_one; 663 664 rs->dma_tx.ch = dma_request_slave_channel(rs->dev, "tx"); 665 if (!rs->dma_tx.ch) 666 dev_warn(rs->dev, "Failed to request TX DMA channel\n"); 667 668 rs->dma_rx.ch = dma_request_slave_channel(rs->dev, "rx"); 669 if (!rs->dma_rx.ch) { 670 if (rs->dma_tx.ch) { 671 dma_release_channel(rs->dma_tx.ch); 672 rs->dma_tx.ch = NULL; 673 } 674 dev_warn(rs->dev, "Failed to request RX DMA channel\n"); 675 } 676 677 if (rs->dma_tx.ch && rs->dma_rx.ch) { 678 rs->dma_tx.addr = (dma_addr_t)(mem->start + ROCKCHIP_SPI_TXDR); 679 rs->dma_rx.addr = (dma_addr_t)(mem->start + ROCKCHIP_SPI_RXDR); 680 rs->dma_tx.direction = DMA_MEM_TO_DEV; 681 rs->dma_rx.direction = DMA_DEV_TO_MEM; 682 683 master->can_dma = rockchip_spi_can_dma; 684 master->dma_tx = rs->dma_tx.ch; 685 master->dma_rx = rs->dma_rx.ch; 686 } 687 688 ret = devm_spi_register_master(&pdev->dev, master); 689 if (ret) { 690 dev_err(&pdev->dev, "Failed to register master\n"); 691 goto err_register_master; 692 } 693 694 return 0; 695 696 err_register_master: 697 if (rs->dma_tx.ch) 698 dma_release_channel(rs->dma_tx.ch); 699 if (rs->dma_rx.ch) 700 dma_release_channel(rs->dma_rx.ch); 701 err_get_fifo_len: 702 clk_disable_unprepare(rs->spiclk); 703 err_spiclk_enable: 704 clk_disable_unprepare(rs->apb_pclk); 705 err_ioremap_resource: 706 spi_master_put(master); 707 708 return ret; 709 } 710 711 static int rockchip_spi_remove(struct platform_device *pdev) 712 { 713 struct spi_master *master = spi_master_get(platform_get_drvdata(pdev)); 714 struct rockchip_spi *rs = spi_master_get_devdata(master); 715 716 pm_runtime_disable(&pdev->dev); 717 718 clk_disable_unprepare(rs->spiclk); 719 clk_disable_unprepare(rs->apb_pclk); 720 721 if (rs->dma_tx.ch) 722 dma_release_channel(rs->dma_tx.ch); 723 if (rs->dma_rx.ch) 724 dma_release_channel(rs->dma_rx.ch); 725 726 spi_master_put(master); 727 728 return 0; 729 } 730 731 #ifdef CONFIG_PM_SLEEP 732 static int rockchip_spi_suspend(struct device *dev) 733 { 734 int ret = 0; 735 struct spi_master *master = dev_get_drvdata(dev); 736 struct rockchip_spi *rs = spi_master_get_devdata(master); 737 738 ret = spi_master_suspend(rs->master); 739 if (ret) 740 return ret; 741 742 if (!pm_runtime_suspended(dev)) { 743 clk_disable_unprepare(rs->spiclk); 744 clk_disable_unprepare(rs->apb_pclk); 745 } 746 747 return ret; 748 } 749 750 static int rockchip_spi_resume(struct device *dev) 751 { 752 int ret = 0; 753 struct spi_master *master = dev_get_drvdata(dev); 754 struct rockchip_spi *rs = spi_master_get_devdata(master); 755 756 if (!pm_runtime_suspended(dev)) { 757 ret = clk_prepare_enable(rs->apb_pclk); 758 if (ret < 0) 759 return ret; 760 761 ret = clk_prepare_enable(rs->spiclk); 762 if (ret < 0) { 763 clk_disable_unprepare(rs->apb_pclk); 764 return ret; 765 } 766 } 767 768 ret = spi_master_resume(rs->master); 769 if (ret < 0) { 770 clk_disable_unprepare(rs->spiclk); 771 clk_disable_unprepare(rs->apb_pclk); 772 } 773 774 return ret; 775 } 776 #endif /* CONFIG_PM_SLEEP */ 777 778 #ifdef CONFIG_PM_RUNTIME 779 static int rockchip_spi_runtime_suspend(struct device *dev) 780 { 781 struct spi_master *master = dev_get_drvdata(dev); 782 struct rockchip_spi *rs = spi_master_get_devdata(master); 783 784 clk_disable_unprepare(rs->spiclk); 785 clk_disable_unprepare(rs->apb_pclk); 786 787 return 0; 788 } 789 790 static int rockchip_spi_runtime_resume(struct device *dev) 791 { 792 int ret; 793 struct spi_master *master = dev_get_drvdata(dev); 794 struct rockchip_spi *rs = spi_master_get_devdata(master); 795 796 ret = clk_prepare_enable(rs->apb_pclk); 797 if (ret) 798 return ret; 799 800 ret = clk_prepare_enable(rs->spiclk); 801 if (ret) 802 clk_disable_unprepare(rs->apb_pclk); 803 804 return ret; 805 } 806 #endif /* CONFIG_PM_RUNTIME */ 807 808 static const struct dev_pm_ops rockchip_spi_pm = { 809 SET_SYSTEM_SLEEP_PM_OPS(rockchip_spi_suspend, rockchip_spi_resume) 810 SET_RUNTIME_PM_OPS(rockchip_spi_runtime_suspend, 811 rockchip_spi_runtime_resume, NULL) 812 }; 813 814 static const struct of_device_id rockchip_spi_dt_match[] = { 815 { .compatible = "rockchip,rk3066-spi", }, 816 { .compatible = "rockchip,rk3188-spi", }, 817 { .compatible = "rockchip,rk3288-spi", }, 818 { }, 819 }; 820 MODULE_DEVICE_TABLE(of, rockchip_spi_dt_match); 821 822 static struct platform_driver rockchip_spi_driver = { 823 .driver = { 824 .name = DRIVER_NAME, 825 .owner = THIS_MODULE, 826 .pm = &rockchip_spi_pm, 827 .of_match_table = of_match_ptr(rockchip_spi_dt_match), 828 }, 829 .probe = rockchip_spi_probe, 830 .remove = rockchip_spi_remove, 831 }; 832 833 module_platform_driver(rockchip_spi_driver); 834 835 MODULE_AUTHOR("Addy Ke <addy.ke@rock-chips.com>"); 836 MODULE_DESCRIPTION("ROCKCHIP SPI Controller Driver"); 837 MODULE_LICENSE("GPL v2"); 838