drivers/spi/spi-rockchip.c

   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_before(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 = rs->max_freq / rs->speed;
 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_SR) & SR_BUSY));
 531
 532         if (!xfer->tx_buf && !xfer->rx_buf) {
 533                 dev_err(rs->dev, "No buffer for transfer\n");
 534                 return -EINVAL;
 535         }
 536
 537         rs->speed = xfer->speed_hz;
 538         rs->bpw = xfer->bits_per_word;
 539         rs->n_bytes = rs->bpw >> 3;
 540
 541         rs->tx = xfer->tx_buf;
 542         rs->tx_end = rs->tx + xfer->len;
 543         rs->rx = xfer->rx_buf;
 544         rs->rx_end = rs->rx + xfer->len;
 545         rs->len = xfer->len;
 546
 547         rs->tx_sg = xfer->tx_sg;
 548         rs->rx_sg = xfer->rx_sg;
 549
 550         if (rs->tx && rs->rx)
 551                 rs->tmode = CR0_XFM_TR;
 552         else if (rs->tx)
 553                 rs->tmode = CR0_XFM_TO;
 554         else if (rs->rx)
 555                 rs->tmode = CR0_XFM_RO;
 556
 557         /* we need prepare dma before spi was enabled */
 558         if (master->can_dma && master->can_dma(master, spi, xfer)) {
 559                 rs->use_dma = 1;
 560                 rockchip_spi_prepare_dma(rs);
 561         } else {
 562                 rs->use_dma = 0;
 563         }
 564
 565         rockchip_spi_config(rs);
 566
 567         if (!rs->use_dma)
 568                 ret = rockchip_spi_pio_transfer(rs);
 569
 570         return ret;
 571 }
 572
 573 static bool rockchip_spi_can_dma(struct spi_master *master,
 574                                  struct spi_device *spi,
 575                                  struct spi_transfer *xfer)
 576 {
 577         struct rockchip_spi *rs = spi_master_get_devdata(master);
 578
 579         return (xfer->len > rs->fifo_len);
 580 }
 581
 582 static int rockchip_spi_probe(struct platform_device *pdev)
 583 {
 584         int ret = 0;
 585         struct rockchip_spi *rs;
 586         struct spi_master *master;
 587         struct resource *mem;
 588
 589         master = spi_alloc_master(&pdev->dev, sizeof(struct rockchip_spi));
 590         if (!master)
 591                 return -ENOMEM;
 592
 593         platform_set_drvdata(pdev, master);
 594
 595         rs = spi_master_get_devdata(master);
 596         memset(rs, 0, sizeof(struct rockchip_spi));
 597
 598         /* Get basic io resource and map it */
 599         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 600         rs->regs = devm_ioremap_resource(&pdev->dev, mem);
 601         if (IS_ERR(rs->regs)) {
 602                 ret =  PTR_ERR(rs->regs);
 603                 goto err_ioremap_resource;
 604         }
 605
 606         rs->apb_pclk = devm_clk_get(&pdev->dev, "apb_pclk");
 607         if (IS_ERR(rs->apb_pclk)) {
 608                 dev_err(&pdev->dev, "Failed to get apb_pclk\n");
 609                 ret = PTR_ERR(rs->apb_pclk);
 610                 goto err_ioremap_resource;
 611         }
 612
 613         rs->spiclk = devm_clk_get(&pdev->dev, "spiclk");
 614         if (IS_ERR(rs->spiclk)) {
 615                 dev_err(&pdev->dev, "Failed to get spi_pclk\n");
 616                 ret = PTR_ERR(rs->spiclk);
 617                 goto err_ioremap_resource;
 618         }
 619
 620         ret = clk_prepare_enable(rs->apb_pclk);
 621         if (ret) {
 622                 dev_err(&pdev->dev, "Failed to enable apb_pclk\n");
 623                 goto err_ioremap_resource;
 624         }
 625
 626         ret = clk_prepare_enable(rs->spiclk);
 627         if (ret) {
 628                 dev_err(&pdev->dev, "Failed to enable spi_clk\n");
 629                 goto err_spiclk_enable;
 630         }
 631
 632         spi_enable_chip(rs, 0);
 633
 634         rs->type = SSI_MOTO_SPI;
 635         rs->master = master;
 636         rs->dev = &pdev->dev;
 637         rs->max_freq = clk_get_rate(rs->spiclk);
 638
 639         rs->fifo_len = get_fifo_len(rs);
 640         if (!rs->fifo_len) {
 641                 dev_err(&pdev->dev, "Failed to get fifo length\n");
 642                 ret = -EINVAL;
 643                 goto err_get_fifo_len;
 644         }
 645
 646         spin_lock_init(&rs->lock);
 647
 648         pm_runtime_set_active(&pdev->dev);
 649         pm_runtime_enable(&pdev->dev);
 650
 651         master->auto_runtime_pm = true;
 652         master->bus_num = pdev->id;
 653         master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP;
 654         master->num_chipselect = 2;
 655         master->dev.of_node = pdev->dev.of_node;
 656         master->bits_per_word_mask = SPI_BPW_MASK(16) | SPI_BPW_MASK(8);
 657
 658         master->set_cs = rockchip_spi_set_cs;
 659         master->prepare_message = rockchip_spi_prepare_message;
 660         master->unprepare_message = rockchip_spi_unprepare_message;
 661         master->transfer_one = rockchip_spi_transfer_one;
 662
 663         rs->dma_tx.ch = dma_request_slave_channel(rs->dev, "tx");
 664         if (!rs->dma_tx.ch)
 665                 dev_warn(rs->dev, "Failed to request TX DMA channel\n");
 666
 667         rs->dma_rx.ch = dma_request_slave_channel(rs->dev, "rx");
 668         if (!rs->dma_rx.ch) {
 669                 if (rs->dma_tx.ch) {
 670                         dma_release_channel(rs->dma_tx.ch);
 671                         rs->dma_tx.ch = NULL;
 672                 }
 673                 dev_warn(rs->dev, "Failed to request RX DMA channel\n");
 674         }
 675
 676         if (rs->dma_tx.ch && rs->dma_rx.ch) {
 677                 rs->dma_tx.addr = (dma_addr_t)(mem->start + ROCKCHIP_SPI_TXDR);
 678                 rs->dma_rx.addr = (dma_addr_t)(mem->start + ROCKCHIP_SPI_RXDR);
 679                 rs->dma_tx.direction = DMA_MEM_TO_DEV;
 680                 rs->dma_tx.direction = DMA_DEV_TO_MEM;
 681
 682                 master->can_dma = rockchip_spi_can_dma;
 683                 master->dma_tx = rs->dma_tx.ch;
 684                 master->dma_rx = rs->dma_rx.ch;
 685         }
 686
 687         ret = devm_spi_register_master(&pdev->dev, master);
 688         if (ret) {
 689                 dev_err(&pdev->dev, "Failed to register master\n");
 690                 goto err_register_master;
 691         }
 692
 693         return 0;
 694
 695 err_register_master:
 696         if (rs->dma_tx.ch)
 697                 dma_release_channel(rs->dma_tx.ch);
 698         if (rs->dma_rx.ch)
 699                 dma_release_channel(rs->dma_rx.ch);
 700 err_get_fifo_len:
 701         clk_disable_unprepare(rs->spiclk);
 702 err_spiclk_enable:
 703         clk_disable_unprepare(rs->apb_pclk);
 704 err_ioremap_resource:
 705         spi_master_put(master);
 706
 707         return ret;
 708 }
 709
 710 static int rockchip_spi_remove(struct platform_device *pdev)
 711 {
 712         struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
 713         struct rockchip_spi *rs = spi_master_get_devdata(master);
 714
 715         pm_runtime_disable(&pdev->dev);
 716
 717         clk_disable_unprepare(rs->spiclk);
 718         clk_disable_unprepare(rs->apb_pclk);
 719
 720         if (rs->dma_tx.ch)
 721                 dma_release_channel(rs->dma_tx.ch);
 722         if (rs->dma_rx.ch)
 723                 dma_release_channel(rs->dma_rx.ch);
 724
 725         spi_master_put(master);
 726
 727         return 0;
 728 }
 729
 730 #ifdef CONFIG_PM_SLEEP
 731 static int rockchip_spi_suspend(struct device *dev)
 732 {
 733         int ret = 0;
 734         struct spi_master *master = dev_get_drvdata(dev);
 735         struct rockchip_spi *rs = spi_master_get_devdata(master);
 736
 737         ret = spi_master_suspend(rs->master);
 738         if (ret)
 739                 return ret;
 740
 741         if (!pm_runtime_suspended(dev)) {
 742                 clk_disable_unprepare(rs->spiclk);
 743                 clk_disable_unprepare(rs->apb_pclk);
 744         }
 745
 746         return ret;
 747 }
 748
 749 static int rockchip_spi_resume(struct device *dev)
 750 {
 751         int ret = 0;
 752         struct spi_master *master = dev_get_drvdata(dev);
 753         struct rockchip_spi *rs = spi_master_get_devdata(master);
 754
 755         if (!pm_runtime_suspended(dev)) {
 756                 ret = clk_prepare_enable(rs->apb_pclk);
 757                 if (ret < 0)
 758                         return ret;
 759
 760                 ret = clk_prepare_enable(rs->spiclk);
 761                 if (ret < 0) {
 762                         clk_disable_unprepare(rs->apb_pclk);
 763                         return ret;
 764                 }
 765         }
 766
 767         ret = spi_master_resume(rs->master);
 768         if (ret < 0) {
 769                 clk_disable_unprepare(rs->spiclk);
 770                 clk_disable_unprepare(rs->apb_pclk);
 771         }
 772
 773         return ret;
 774 }
 775 #endif /* CONFIG_PM_SLEEP */
 776
 777 #ifdef CONFIG_PM_RUNTIME
 778 static int rockchip_spi_runtime_suspend(struct device *dev)
 779 {
 780         struct spi_master *master = dev_get_drvdata(dev);
 781         struct rockchip_spi *rs = spi_master_get_devdata(master);
 782
 783         clk_disable_unprepare(rs->spiclk);
 784         clk_disable_unprepare(rs->apb_pclk);
 785
 786         return 0;
 787 }
 788
 789 static int rockchip_spi_runtime_resume(struct device *dev)
 790 {
 791         int ret;
 792         struct spi_master *master = dev_get_drvdata(dev);
 793         struct rockchip_spi *rs = spi_master_get_devdata(master);
 794
 795         ret = clk_prepare_enable(rs->apb_pclk);
 796         if (ret)
 797                 return ret;
 798
 799         ret = clk_prepare_enable(rs->spiclk);
 800         if (ret)
 801                 clk_disable_unprepare(rs->apb_pclk);
 802
 803         return ret;
 804 }
 805 #endif /* CONFIG_PM_RUNTIME */
 806
 807 static const struct dev_pm_ops rockchip_spi_pm = {
 808         SET_SYSTEM_SLEEP_PM_OPS(rockchip_spi_suspend, rockchip_spi_resume)
 809         SET_RUNTIME_PM_OPS(rockchip_spi_runtime_suspend,
 810                            rockchip_spi_runtime_resume, NULL)
 811 };
 812
 813 static const struct of_device_id rockchip_spi_dt_match[] = {
 814         { .compatible = "rockchip,rk3066-spi", },
 815         { .compatible = "rockchip,rk3188-spi", },
 816         { .compatible = "rockchip,rk3288-spi", },
 817         { },
 818 };
 819 MODULE_DEVICE_TABLE(of, rockchip_spi_dt_match);
 820
 821 static struct platform_driver rockchip_spi_driver = {
 822         .driver = {
 823                 .name   = DRIVER_NAME,
 824                 .owner = THIS_MODULE,
 825                 .pm = &rockchip_spi_pm,
 826                 .of_match_table = of_match_ptr(rockchip_spi_dt_match),
 827         },
 828         .probe = rockchip_spi_probe,
 829         .remove = rockchip_spi_remove,
 830 };
 831
 832 module_platform_driver(rockchip_spi_driver);
 833
 834 MODULE_AUTHOR("Addy Ke <addy.ke@rock-chips.com>");
 835 MODULE_DESCRIPTION("ROCKCHIP SPI Controller Driver");
 836 MODULE_LICENSE("GPL v2");