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/clk.h>
  17 #include <linux/dmaengine.h>
  18 #include <linux/module.h>
  19 #include <linux/of.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/spi/spi.h>
  22 #include <linux/pm_runtime.h>
  23 #include <linux/scatterlist.h>
  24
  25 #define DRIVER_NAME "rockchip-spi"
  26
  27 /* SPI register offsets */
  28 #define ROCKCHIP_SPI_CTRLR0                     0x0000
  29 #define ROCKCHIP_SPI_CTRLR1                     0x0004
  30 #define ROCKCHIP_SPI_SSIENR                     0x0008
  31 #define ROCKCHIP_SPI_SER                        0x000c
  32 #define ROCKCHIP_SPI_BAUDR                      0x0010
  33 #define ROCKCHIP_SPI_TXFTLR                     0x0014
  34 #define ROCKCHIP_SPI_RXFTLR                     0x0018
  35 #define ROCKCHIP_SPI_TXFLR                      0x001c
  36 #define ROCKCHIP_SPI_RXFLR                      0x0020
  37 #define ROCKCHIP_SPI_SR                         0x0024
  38 #define ROCKCHIP_SPI_IPR                        0x0028
  39 #define ROCKCHIP_SPI_IMR                        0x002c
  40 #define ROCKCHIP_SPI_ISR                        0x0030
  41 #define ROCKCHIP_SPI_RISR                       0x0034
  42 #define ROCKCHIP_SPI_ICR                        0x0038
  43 #define ROCKCHIP_SPI_DMACR                      0x003c
  44 #define ROCKCHIP_SPI_DMATDLR            0x0040
  45 #define ROCKCHIP_SPI_DMARDLR            0x0044
  46 #define ROCKCHIP_SPI_TXDR                       0x0400
  47 #define ROCKCHIP_SPI_RXDR                       0x0800
  48
  49 /* Bit fields in CTRLR0 */
  50 #define CR0_DFS_OFFSET                          0
  51
  52 #define CR0_CFS_OFFSET                          2
  53
  54 #define CR0_SCPH_OFFSET                         6
  55
  56 #define CR0_SCPOL_OFFSET                        7
  57
  58 #define CR0_CSM_OFFSET                          8
  59 #define CR0_CSM_KEEP                            0x0
  60 /* ss_n be high for half sclk_out cycles */
  61 #define CR0_CSM_HALF                            0X1
  62 /* ss_n be high for one sclk_out cycle */
  63 #define CR0_CSM_ONE                                     0x2
  64
  65 /* ss_n to sclk_out delay */
  66 #define CR0_SSD_OFFSET                          10
  67 /*
  68  * The period between ss_n active and
  69  * sclk_out active is half sclk_out cycles
  70  */
  71 #define CR0_SSD_HALF                            0x0
  72 /*
  73  * The period between ss_n active and
  74  * sclk_out active is one sclk_out cycle
  75  */
  76 #define CR0_SSD_ONE                                     0x1
  77
  78 #define CR0_EM_OFFSET                           11
  79 #define CR0_EM_LITTLE                           0x0
  80 #define CR0_EM_BIG                                      0x1
  81
  82 #define CR0_FBM_OFFSET                          12
  83 #define CR0_FBM_MSB                                     0x0
  84 #define CR0_FBM_LSB                                     0x1
  85
  86 #define CR0_BHT_OFFSET                          13
  87 #define CR0_BHT_16BIT                           0x0
  88 #define CR0_BHT_8BIT                            0x1
  89
  90 #define CR0_RSD_OFFSET                          14
  91
  92 #define CR0_FRF_OFFSET                          16
  93 #define CR0_FRF_SPI                                     0x0
  94 #define CR0_FRF_SSP                                     0x1
  95 #define CR0_FRF_MICROWIRE                       0x2
  96
  97 #define CR0_XFM_OFFSET                          18
  98 #define CR0_XFM_MASK                            (0x03 << SPI_XFM_OFFSET)
  99 #define CR0_XFM_TR                                      0x0
 100 #define CR0_XFM_TO                                      0x1
 101 #define CR0_XFM_RO                                      0x2
 102
 103 #define CR0_OPM_OFFSET                          20
 104 #define CR0_OPM_MASTER                          0x0
 105 #define CR0_OPM_SLAVE                           0x1
 106
 107 #define CR0_MTM_OFFSET                          0x21
 108
 109 /* Bit fields in SER, 2bit */
 110 #define SER_MASK                                        0x3
 111
 112 /* Bit fields in SR, 5bit */
 113 #define SR_MASK                                         0x1f
 114 #define SR_BUSY                                         (1 << 0)
 115 #define SR_TF_FULL                                      (1 << 1)
 116 #define SR_TF_EMPTY                                     (1 << 2)
 117 #define SR_RF_EMPTY                                     (1 << 3)
 118 #define SR_RF_FULL                                      (1 << 4)
 119
 120 /* Bit fields in ISR, IMR, ISR, RISR, 5bit */
 121 #define INT_MASK                                        0x1f
 122 #define INT_TF_EMPTY                            (1 << 0)
 123 #define INT_TF_OVERFLOW                         (1 << 1)
 124 #define INT_RF_UNDERFLOW                        (1 << 2)
 125 #define INT_RF_OVERFLOW                         (1 << 3)
 126 #define INT_RF_FULL                                     (1 << 4)
 127
 128 /* Bit fields in ICR, 4bit */
 129 #define ICR_MASK                                        0x0f
 130 #define ICR_ALL                                         (1 << 0)
 131 #define ICR_RF_UNDERFLOW                        (1 << 1)
 132 #define ICR_RF_OVERFLOW                         (1 << 2)
 133 #define ICR_TF_OVERFLOW                         (1 << 3)
 134
 135 /* Bit fields in DMACR */
 136 #define RF_DMA_EN                                       (1 << 0)
 137 #define TF_DMA_EN                                       (1 << 1)
 138
 139 #define RXBUSY                                          (1 << 0)
 140 #define TXBUSY                                          (1 << 1)
 141
 142 /* sclk_out: spi master internal logic in rk3x can support 50Mhz */
 143 #define MAX_SCLK_OUT            50000000
 144
 145 enum rockchip_ssi_type {
 146         SSI_MOTO_SPI = 0,
 147         SSI_TI_SSP,
 148         SSI_NS_MICROWIRE,
 149 };
 150
 151 struct rockchip_spi_dma_data {
 152         struct dma_chan *ch;
 153         enum dma_transfer_direction direction;
 154         dma_addr_t addr;
 155 };
 156
 157 struct rockchip_spi {
 158         struct device *dev;
 159         struct spi_master *master;
 160
 161         struct clk *spiclk;
 162         struct clk *apb_pclk;
 163
 164         void __iomem *regs;
 165         /*depth of the FIFO buffer */
 166         u32 fifo_len;
 167         /* max bus freq supported */
 168         u32 max_freq;
 169         /* supported slave numbers */
 170         enum rockchip_ssi_type type;
 171
 172         u16 mode;
 173         u8 tmode;
 174         u8 bpw;
 175         u8 n_bytes;
 176         u32 rsd_nsecs;
 177         unsigned len;
 178         u32 speed;
 179
 180         const void *tx;
 181         const void *tx_end;
 182         void *rx;
 183         void *rx_end;
 184
 185         u32 state;
 186         /* protect state */
 187         spinlock_t lock;
 188
 189         u32 use_dma;
 190         struct sg_table tx_sg;
 191         struct sg_table rx_sg;
 192         struct rockchip_spi_dma_data dma_rx;
 193         struct rockchip_spi_dma_data dma_tx;
 194         struct dma_slave_caps dma_caps;
 195 };
 196
 197 static inline void spi_enable_chip(struct rockchip_spi *rs, int enable)
 198 {
 199         writel_relaxed((enable ? 1 : 0), rs->regs + ROCKCHIP_SPI_SSIENR);
 200 }
 201
 202 static inline void spi_set_clk(struct rockchip_spi *rs, u16 div)
 203 {
 204         writel_relaxed(div, rs->regs + ROCKCHIP_SPI_BAUDR);
 205 }
 206
 207 static inline void flush_fifo(struct rockchip_spi *rs)
 208 {
 209         while (readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR))
 210                 readl_relaxed(rs->regs + ROCKCHIP_SPI_RXDR);
 211 }
 212
 213 static inline void wait_for_idle(struct rockchip_spi *rs)
 214 {
 215         unsigned long timeout = jiffies + msecs_to_jiffies(5);
 216
 217         do {
 218                 if (!(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY))
 219                         return;
 220         } while (!time_after(jiffies, timeout));
 221
 222         dev_warn(rs->dev, "spi controller is in busy state!\n");
 223 }
 224
 225 static u32 get_fifo_len(struct rockchip_spi *rs)
 226 {
 227         u32 fifo;
 228
 229         for (fifo = 2; fifo < 32; fifo++) {
 230                 writel_relaxed(fifo, rs->regs + ROCKCHIP_SPI_TXFTLR);
 231                 if (fifo != readl_relaxed(rs->regs + ROCKCHIP_SPI_TXFTLR))
 232                         break;
 233         }
 234
 235         writel_relaxed(0, rs->regs + ROCKCHIP_SPI_TXFTLR);
 236
 237         return (fifo == 31) ? 0 : fifo;
 238 }
 239
 240 static inline u32 tx_max(struct rockchip_spi *rs)
 241 {
 242         u32 tx_left, tx_room;
 243
 244         tx_left = (rs->tx_end - rs->tx) / rs->n_bytes;
 245         tx_room = rs->fifo_len - readl_relaxed(rs->regs + ROCKCHIP_SPI_TXFLR);
 246
 247         return min(tx_left, tx_room);
 248 }
 249
 250 static inline u32 rx_max(struct rockchip_spi *rs)
 251 {
 252         u32 rx_left = (rs->rx_end - rs->rx) / rs->n_bytes;
 253         u32 rx_room = (u32)readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR);
 254
 255         return min(rx_left, rx_room);
 256 }
 257
 258 static void rockchip_spi_set_cs(struct spi_device *spi, bool enable)
 259 {
 260         u32 ser;
 261         struct spi_master *master = spi->master;
 262         struct rockchip_spi *rs = spi_master_get_devdata(master);
 263
 264         pm_runtime_get_sync(rs->dev);
 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         pm_runtime_put_sync(rs->dev);
 291 }
 292
 293 static int rockchip_spi_prepare_message(struct spi_master *master,
 294                                         struct spi_message *msg)
 295 {
 296         struct rockchip_spi *rs = spi_master_get_devdata(master);
 297         struct spi_device *spi = msg->spi;
 298
 299         rs->mode = spi->mode;
 300
 301         return 0;
 302 }
 303
 304 static void rockchip_spi_handle_err(struct spi_master *master,
 305                                     struct spi_message *msg)
 306 {
 307         unsigned long flags;
 308         struct rockchip_spi *rs = spi_master_get_devdata(master);
 309
 310         spin_lock_irqsave(&rs->lock, flags);
 311
 312         /*
 313          * For DMA mode, we need terminate DMA channel and flush
 314          * fifo for the next transfer if DMA thansfer timeout.
 315          * handle_err() was called by core if transfer failed.
 316          * Maybe it is reasonable for error handling here.
 317          */
 318         if (rs->use_dma) {
 319                 if (rs->state & RXBUSY) {
 320                         dmaengine_terminate_async(rs->dma_rx.ch);
 321                         flush_fifo(rs);
 322                 }
 323
 324                 if (rs->state & TXBUSY)
 325                         dmaengine_terminate_async(rs->dma_tx.ch);
 326         }
 327
 328         spin_unlock_irqrestore(&rs->lock, flags);
 329 }
 330
 331 static int rockchip_spi_unprepare_message(struct spi_master *master,
 332                                           struct spi_message *msg)
 333 {
 334         struct rockchip_spi *rs = spi_master_get_devdata(master);
 335
 336         spi_enable_chip(rs, 0);
 337
 338         return 0;
 339 }
 340
 341 static void rockchip_spi_pio_writer(struct rockchip_spi *rs)
 342 {
 343         u32 max = tx_max(rs);
 344         u32 txw = 0;
 345
 346         while (max--) {
 347                 if (rs->n_bytes == 1)
 348                         txw = *(u8 *)(rs->tx);
 349                 else
 350                         txw = *(u16 *)(rs->tx);
 351
 352                 writel_relaxed(txw, rs->regs + ROCKCHIP_SPI_TXDR);
 353                 rs->tx += rs->n_bytes;
 354         }
 355 }
 356
 357 static void rockchip_spi_pio_reader(struct rockchip_spi *rs)
 358 {
 359         u32 max = rx_max(rs);
 360         u32 rxw;
 361
 362         while (max--) {
 363                 rxw = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXDR);
 364                 if (rs->n_bytes == 1)
 365                         *(u8 *)(rs->rx) = (u8)rxw;
 366                 else
 367                         *(u16 *)(rs->rx) = (u16)rxw;
 368                 rs->rx += rs->n_bytes;
 369         }
 370 }
 371
 372 static int rockchip_spi_pio_transfer(struct rockchip_spi *rs)
 373 {
 374         int remain = 0;
 375
 376         do {
 377                 if (rs->tx) {
 378                         remain = rs->tx_end - rs->tx;
 379                         rockchip_spi_pio_writer(rs);
 380                 }
 381
 382                 if (rs->rx) {
 383                         remain = rs->rx_end - rs->rx;
 384                         rockchip_spi_pio_reader(rs);
 385                 }
 386
 387                 cpu_relax();
 388         } while (remain);
 389
 390         /* If tx, wait until the FIFO data completely. */
 391         if (rs->tx)
 392                 wait_for_idle(rs);
 393
 394         spi_enable_chip(rs, 0);
 395
 396         return 0;
 397 }
 398
 399 static void rockchip_spi_dma_rxcb(void *data)
 400 {
 401         unsigned long flags;
 402         struct rockchip_spi *rs = data;
 403
 404         spin_lock_irqsave(&rs->lock, flags);
 405
 406         rs->state &= ~RXBUSY;
 407         if (!(rs->state & TXBUSY)) {
 408                 spi_enable_chip(rs, 0);
 409                 spi_finalize_current_transfer(rs->master);
 410         }
 411
 412         spin_unlock_irqrestore(&rs->lock, flags);
 413 }
 414
 415 static void rockchip_spi_dma_txcb(void *data)
 416 {
 417         unsigned long flags;
 418         struct rockchip_spi *rs = data;
 419
 420         /* Wait until the FIFO data completely. */
 421         wait_for_idle(rs);
 422
 423         spin_lock_irqsave(&rs->lock, flags);
 424
 425         rs->state &= ~TXBUSY;
 426         if (!(rs->state & RXBUSY)) {
 427                 spi_enable_chip(rs, 0);
 428                 spi_finalize_current_transfer(rs->master);
 429         }
 430
 431         spin_unlock_irqrestore(&rs->lock, flags);
 432 }
 433
 434 static int rockchip_spi_prepare_dma(struct rockchip_spi *rs)
 435 {
 436         unsigned long flags;
 437         struct dma_slave_config rxconf, txconf;
 438         struct dma_async_tx_descriptor *rxdesc, *txdesc;
 439
 440         spin_lock_irqsave(&rs->lock, flags);
 441         rs->state &= ~RXBUSY;
 442         rs->state &= ~TXBUSY;
 443         spin_unlock_irqrestore(&rs->lock, flags);
 444
 445         rxdesc = NULL;
 446         if (rs->rx) {
 447                 rxconf.direction = rs->dma_rx.direction;
 448                 rxconf.src_addr = rs->dma_rx.addr;
 449                 rxconf.src_addr_width = rs->n_bytes;
 450                 if (rs->dma_caps.max_burst > 4)
 451                         rxconf.src_maxburst = 4;
 452                 else
 453                         rxconf.src_maxburst = 1;
 454                 dmaengine_slave_config(rs->dma_rx.ch, &rxconf);
 455
 456                 rxdesc = dmaengine_prep_slave_sg(
 457                                 rs->dma_rx.ch,
 458                                 rs->rx_sg.sgl, rs->rx_sg.nents,
 459                                 rs->dma_rx.direction, DMA_PREP_INTERRUPT);
 460                 if (!rxdesc)
 461                         return -EINVAL;
 462
 463                 rxdesc->callback = rockchip_spi_dma_rxcb;
 464                 rxdesc->callback_param = rs;
 465         }
 466
 467         txdesc = NULL;
 468         if (rs->tx) {
 469                 txconf.direction = rs->dma_tx.direction;
 470                 txconf.dst_addr = rs->dma_tx.addr;
 471                 txconf.dst_addr_width = rs->n_bytes;
 472                 if (rs->dma_caps.max_burst > 4)
 473                         txconf.dst_maxburst = 4;
 474                 else
 475                         txconf.dst_maxburst = 1;
 476                 dmaengine_slave_config(rs->dma_tx.ch, &txconf);
 477
 478                 txdesc = dmaengine_prep_slave_sg(
 479                                 rs->dma_tx.ch,
 480                                 rs->tx_sg.sgl, rs->tx_sg.nents,
 481                                 rs->dma_tx.direction, DMA_PREP_INTERRUPT);
 482                 if (!txdesc) {
 483                         if (rxdesc)
 484                                 dmaengine_terminate_sync(rs->dma_rx.ch);
 485                         return -EINVAL;
 486                 }
 487
 488                 txdesc->callback = rockchip_spi_dma_txcb;
 489                 txdesc->callback_param = rs;
 490         }
 491
 492         /* rx must be started before tx due to spi instinct */
 493         if (rxdesc) {
 494                 spin_lock_irqsave(&rs->lock, flags);
 495                 rs->state |= RXBUSY;
 496                 spin_unlock_irqrestore(&rs->lock, flags);
 497                 dmaengine_submit(rxdesc);
 498                 dma_async_issue_pending(rs->dma_rx.ch);
 499         }
 500
 501         if (txdesc) {
 502                 spin_lock_irqsave(&rs->lock, flags);
 503                 rs->state |= TXBUSY;
 504                 spin_unlock_irqrestore(&rs->lock, flags);
 505                 dmaengine_submit(txdesc);
 506                 dma_async_issue_pending(rs->dma_tx.ch);
 507         }
 508
 509         return 0;
 510 }
 511
 512 static void rockchip_spi_config(struct rockchip_spi *rs)
 513 {
 514         u32 div = 0;
 515         u32 dmacr = 0;
 516         int rsd = 0;
 517
 518         u32 cr0 = (CR0_BHT_8BIT << CR0_BHT_OFFSET)
 519                 | (CR0_SSD_ONE << CR0_SSD_OFFSET)
 520                 | (CR0_EM_BIG << CR0_EM_OFFSET);
 521
 522         cr0 |= (rs->n_bytes << CR0_DFS_OFFSET);
 523         cr0 |= ((rs->mode & 0x3) << CR0_SCPH_OFFSET);
 524         cr0 |= (rs->tmode << CR0_XFM_OFFSET);
 525         cr0 |= (rs->type << CR0_FRF_OFFSET);
 526
 527         if (rs->use_dma) {
 528                 if (rs->tx)
 529                         dmacr |= TF_DMA_EN;
 530                 if (rs->rx)
 531                         dmacr |= RF_DMA_EN;
 532         }
 533
 534         if (WARN_ON(rs->speed > MAX_SCLK_OUT))
 535                 rs->speed = MAX_SCLK_OUT;
 536
 537         /* the minimum divisor is 2 */
 538         if (rs->max_freq < 2 * rs->speed) {
 539                 clk_set_rate(rs->spiclk, 2 * rs->speed);
 540                 rs->max_freq = clk_get_rate(rs->spiclk);
 541         }
 542
 543         /* div doesn't support odd number */
 544         div = DIV_ROUND_UP(rs->max_freq, rs->speed);
 545         div = (div + 1) & 0xfffe;
 546
 547         /* Rx sample delay is expressed in parent clock cycles (max 3) */
 548         rsd = DIV_ROUND_CLOSEST(rs->rsd_nsecs * (rs->max_freq >> 8),
 549                                 1000000000 >> 8);
 550         if (!rsd && rs->rsd_nsecs) {
 551                 pr_warn_once("rockchip-spi: %u Hz are too slow to express %u ns delay\n",
 552                              rs->max_freq, rs->rsd_nsecs);
 553         } else if (rsd > 3) {
 554                 rsd = 3;
 555                 pr_warn_once("rockchip-spi: %u Hz are too fast to express %u ns delay, clamping at %u ns\n",
 556                              rs->max_freq, rs->rsd_nsecs,
 557                              rsd * 1000000000U / rs->max_freq);
 558         }
 559         cr0 |= rsd << CR0_RSD_OFFSET;
 560
 561         writel_relaxed(cr0, rs->regs + ROCKCHIP_SPI_CTRLR0);
 562
 563         writel_relaxed(rs->len - 1, rs->regs + ROCKCHIP_SPI_CTRLR1);
 564         writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_TXFTLR);
 565         writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_RXFTLR);
 566
 567         writel_relaxed(0, rs->regs + ROCKCHIP_SPI_DMATDLR);
 568         writel_relaxed(0, rs->regs + ROCKCHIP_SPI_DMARDLR);
 569         writel_relaxed(dmacr, rs->regs + ROCKCHIP_SPI_DMACR);
 570
 571         spi_set_clk(rs, div);
 572
 573         dev_dbg(rs->dev, "cr0 0x%x, div %d\n", cr0, div);
 574 }
 575
 576 static int rockchip_spi_transfer_one(
 577                 struct spi_master *master,
 578                 struct spi_device *spi,
 579                 struct spi_transfer *xfer)
 580 {
 581         int ret = 1;
 582         struct rockchip_spi *rs = spi_master_get_devdata(master);
 583
 584         WARN_ON(readl_relaxed(rs->regs + ROCKCHIP_SPI_SSIENR) &&
 585                 (readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY));
 586
 587         if (!xfer->tx_buf && !xfer->rx_buf) {
 588                 dev_err(rs->dev, "No buffer for transfer\n");
 589                 return -EINVAL;
 590         }
 591
 592         rs->speed = xfer->speed_hz;
 593         rs->bpw = xfer->bits_per_word;
 594         rs->n_bytes = rs->bpw >> 3;
 595
 596         rs->tx = xfer->tx_buf;
 597         rs->tx_end = rs->tx + xfer->len;
 598         rs->rx = xfer->rx_buf;
 599         rs->rx_end = rs->rx + xfer->len;
 600         rs->len = xfer->len;
 601
 602         rs->tx_sg = xfer->tx_sg;
 603         rs->rx_sg = xfer->rx_sg;
 604
 605         if (rs->tx && rs->rx)
 606                 rs->tmode = CR0_XFM_TR;
 607         else if (rs->tx)
 608                 rs->tmode = CR0_XFM_TO;
 609         else if (rs->rx)
 610                 rs->tmode = CR0_XFM_RO;
 611
 612         /* we need prepare dma before spi was enabled */
 613         if (master->can_dma && master->can_dma(master, spi, xfer))
 614                 rs->use_dma = 1;
 615         else
 616                 rs->use_dma = 0;
 617
 618         rockchip_spi_config(rs);
 619
 620         if (rs->use_dma) {
 621                 if (rs->tmode == CR0_XFM_RO) {
 622                         /* rx: dma must be prepared first */
 623                         ret = rockchip_spi_prepare_dma(rs);
 624                         spi_enable_chip(rs, 1);
 625                 } else {
 626                         /* tx or tr: spi must be enabled first */
 627                         spi_enable_chip(rs, 1);
 628                         ret = rockchip_spi_prepare_dma(rs);
 629                 }
 630         } else {
 631                 spi_enable_chip(rs, 1);
 632                 ret = rockchip_spi_pio_transfer(rs);
 633         }
 634
 635         return ret;
 636 }
 637
 638 static bool rockchip_spi_can_dma(struct spi_master *master,
 639                                  struct spi_device *spi,
 640                                  struct spi_transfer *xfer)
 641 {
 642         struct rockchip_spi *rs = spi_master_get_devdata(master);
 643
 644         return (xfer->len > rs->fifo_len);
 645 }
 646
 647 static int rockchip_spi_probe(struct platform_device *pdev)
 648 {
 649         int ret = 0;
 650         struct rockchip_spi *rs;
 651         struct spi_master *master;
 652         struct resource *mem;
 653         u32 rsd_nsecs;
 654
 655         master = spi_alloc_master(&pdev->dev, sizeof(struct rockchip_spi));
 656         if (!master)
 657                 return -ENOMEM;
 658
 659         platform_set_drvdata(pdev, master);
 660
 661         rs = spi_master_get_devdata(master);
 662
 663         /* Get basic io resource and map it */
 664         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 665         rs->regs = devm_ioremap_resource(&pdev->dev, mem);
 666         if (IS_ERR(rs->regs)) {
 667                 ret =  PTR_ERR(rs->regs);
 668                 goto err_ioremap_resource;
 669         }
 670
 671         rs->apb_pclk = devm_clk_get(&pdev->dev, "apb_pclk");
 672         if (IS_ERR(rs->apb_pclk)) {
 673                 dev_err(&pdev->dev, "Failed to get apb_pclk\n");
 674                 ret = PTR_ERR(rs->apb_pclk);
 675                 goto err_ioremap_resource;
 676         }
 677
 678         rs->spiclk = devm_clk_get(&pdev->dev, "spiclk");
 679         if (IS_ERR(rs->spiclk)) {
 680                 dev_err(&pdev->dev, "Failed to get spi_pclk\n");
 681                 ret = PTR_ERR(rs->spiclk);
 682                 goto err_ioremap_resource;
 683         }
 684
 685         ret = clk_prepare_enable(rs->apb_pclk);
 686         if (ret) {
 687                 dev_err(&pdev->dev, "Failed to enable apb_pclk\n");
 688                 goto err_ioremap_resource;
 689         }
 690
 691         ret = clk_prepare_enable(rs->spiclk);
 692         if (ret) {
 693                 dev_err(&pdev->dev, "Failed to enable spi_clk\n");
 694                 goto err_spiclk_enable;
 695         }
 696
 697         spi_enable_chip(rs, 0);
 698
 699         rs->type = SSI_MOTO_SPI;
 700         rs->master = master;
 701         rs->dev = &pdev->dev;
 702         rs->max_freq = clk_get_rate(rs->spiclk);
 703
 704         if (!of_property_read_u32(pdev->dev.of_node, "rx-sample-delay-ns",
 705                                   &rsd_nsecs))
 706                 rs->rsd_nsecs = rsd_nsecs;
 707
 708         rs->fifo_len = get_fifo_len(rs);
 709         if (!rs->fifo_len) {
 710                 dev_err(&pdev->dev, "Failed to get fifo length\n");
 711                 ret = -EINVAL;
 712                 goto err_get_fifo_len;
 713         }
 714
 715         spin_lock_init(&rs->lock);
 716
 717         pm_runtime_set_active(&pdev->dev);
 718         pm_runtime_enable(&pdev->dev);
 719
 720         master->auto_runtime_pm = true;
 721         master->bus_num = pdev->id;
 722         master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP;
 723         master->num_chipselect = 2;
 724         master->dev.of_node = pdev->dev.of_node;
 725         master->bits_per_word_mask = SPI_BPW_MASK(16) | SPI_BPW_MASK(8);
 726
 727         master->set_cs = rockchip_spi_set_cs;
 728         master->prepare_message = rockchip_spi_prepare_message;
 729         master->unprepare_message = rockchip_spi_unprepare_message;
 730         master->transfer_one = rockchip_spi_transfer_one;
 731         master->handle_err = rockchip_spi_handle_err;
 732
 733         rs->dma_tx.ch = dma_request_chan(rs->dev, "tx");
 734         if (IS_ERR(rs->dma_tx.ch)) {
 735                 /* Check tx to see if we need defer probing driver */
 736                 if (PTR_ERR(rs->dma_tx.ch) == -EPROBE_DEFER) {
 737                         ret = -EPROBE_DEFER;
 738                         goto err_get_fifo_len;
 739                 }
 740                 dev_warn(rs->dev, "Failed to request TX DMA channel\n");
 741                 rs->dma_tx.ch = NULL;
 742         }
 743
 744         rs->dma_rx.ch = dma_request_chan(rs->dev, "rx");
 745         if (IS_ERR(rs->dma_rx.ch)) {
 746                 if (PTR_ERR(rs->dma_rx.ch) == -EPROBE_DEFER) {
 747                         ret = -EPROBE_DEFER;
 748                         goto err_free_dma_tx;
 749                 }
 750                 dev_warn(rs->dev, "Failed to request RX DMA channel\n");
 751                 rs->dma_rx.ch = NULL;
 752         }
 753
 754         if (rs->dma_tx.ch && rs->dma_rx.ch) {
 755                 dma_get_slave_caps(rs->dma_rx.ch, &(rs->dma_caps));
 756                 rs->dma_tx.addr = (dma_addr_t)(mem->start + ROCKCHIP_SPI_TXDR);
 757                 rs->dma_rx.addr = (dma_addr_t)(mem->start + ROCKCHIP_SPI_RXDR);
 758                 rs->dma_tx.direction = DMA_MEM_TO_DEV;
 759                 rs->dma_rx.direction = DMA_DEV_TO_MEM;
 760
 761                 master->can_dma = rockchip_spi_can_dma;
 762                 master->dma_tx = rs->dma_tx.ch;
 763                 master->dma_rx = rs->dma_rx.ch;
 764         }
 765
 766         ret = devm_spi_register_master(&pdev->dev, master);
 767         if (ret) {
 768                 dev_err(&pdev->dev, "Failed to register master\n");
 769                 goto err_register_master;
 770         }
 771
 772         return 0;
 773
 774 err_register_master:
 775         pm_runtime_disable(&pdev->dev);
 776         if (rs->dma_rx.ch)
 777                 dma_release_channel(rs->dma_rx.ch);
 778 err_free_dma_tx:
 779         if (rs->dma_tx.ch)
 780                 dma_release_channel(rs->dma_tx.ch);
 781 err_get_fifo_len:
 782         clk_disable_unprepare(rs->spiclk);
 783 err_spiclk_enable:
 784         clk_disable_unprepare(rs->apb_pclk);
 785 err_ioremap_resource:
 786         spi_master_put(master);
 787
 788         return ret;
 789 }
 790
 791 static int rockchip_spi_remove(struct platform_device *pdev)
 792 {
 793         struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
 794         struct rockchip_spi *rs = spi_master_get_devdata(master);
 795
 796         pm_runtime_disable(&pdev->dev);
 797
 798         clk_disable_unprepare(rs->spiclk);
 799         clk_disable_unprepare(rs->apb_pclk);
 800
 801         if (rs->dma_tx.ch)
 802                 dma_release_channel(rs->dma_tx.ch);
 803         if (rs->dma_rx.ch)
 804                 dma_release_channel(rs->dma_rx.ch);
 805
 806         spi_master_put(master);
 807
 808         return 0;
 809 }
 810
 811 #ifdef CONFIG_PM_SLEEP
 812 static int rockchip_spi_suspend(struct device *dev)
 813 {
 814         int ret = 0;
 815         struct spi_master *master = dev_get_drvdata(dev);
 816         struct rockchip_spi *rs = spi_master_get_devdata(master);
 817
 818         ret = spi_master_suspend(rs->master);
 819         if (ret)
 820                 return ret;
 821
 822         if (!pm_runtime_suspended(dev)) {
 823                 clk_disable_unprepare(rs->spiclk);
 824                 clk_disable_unprepare(rs->apb_pclk);
 825         }
 826
 827         return ret;
 828 }
 829
 830 static int rockchip_spi_resume(struct device *dev)
 831 {
 832         int ret = 0;
 833         struct spi_master *master = dev_get_drvdata(dev);
 834         struct rockchip_spi *rs = spi_master_get_devdata(master);
 835
 836         if (!pm_runtime_suspended(dev)) {
 837                 ret = clk_prepare_enable(rs->apb_pclk);
 838                 if (ret < 0)
 839                         return ret;
 840
 841                 ret = clk_prepare_enable(rs->spiclk);
 842                 if (ret < 0) {
 843                         clk_disable_unprepare(rs->apb_pclk);
 844                         return ret;
 845                 }
 846         }
 847
 848         ret = spi_master_resume(rs->master);
 849         if (ret < 0) {
 850                 clk_disable_unprepare(rs->spiclk);
 851                 clk_disable_unprepare(rs->apb_pclk);
 852         }
 853
 854         return ret;
 855 }
 856 #endif /* CONFIG_PM_SLEEP */
 857
 858 #ifdef CONFIG_PM
 859 static int rockchip_spi_runtime_suspend(struct device *dev)
 860 {
 861         struct spi_master *master = dev_get_drvdata(dev);
 862         struct rockchip_spi *rs = spi_master_get_devdata(master);
 863
 864         clk_disable_unprepare(rs->spiclk);
 865         clk_disable_unprepare(rs->apb_pclk);
 866
 867         return 0;
 868 }
 869
 870 static int rockchip_spi_runtime_resume(struct device *dev)
 871 {
 872         int ret;
 873         struct spi_master *master = dev_get_drvdata(dev);
 874         struct rockchip_spi *rs = spi_master_get_devdata(master);
 875
 876         ret = clk_prepare_enable(rs->apb_pclk);
 877         if (ret)
 878                 return ret;
 879
 880         ret = clk_prepare_enable(rs->spiclk);
 881         if (ret)
 882                 clk_disable_unprepare(rs->apb_pclk);
 883
 884         return ret;
 885 }
 886 #endif /* CONFIG_PM */
 887
 888 static const struct dev_pm_ops rockchip_spi_pm = {
 889         SET_SYSTEM_SLEEP_PM_OPS(rockchip_spi_suspend, rockchip_spi_resume)
 890         SET_RUNTIME_PM_OPS(rockchip_spi_runtime_suspend,
 891                            rockchip_spi_runtime_resume, NULL)
 892 };
 893
 894 static const struct of_device_id rockchip_spi_dt_match[] = {
 895         { .compatible = "rockchip,rk3066-spi", },
 896         { .compatible = "rockchip,rk3188-spi", },
 897         { .compatible = "rockchip,rk3288-spi", },
 898         { .compatible = "rockchip,rk3399-spi", },
 899         { },
 900 };
 901 MODULE_DEVICE_TABLE(of, rockchip_spi_dt_match);
 902
 903 static struct platform_driver rockchip_spi_driver = {
 904         .driver = {
 905                 .name   = DRIVER_NAME,
 906                 .pm = &rockchip_spi_pm,
 907                 .of_match_table = of_match_ptr(rockchip_spi_dt_match),
 908         },
 909         .probe = rockchip_spi_probe,
 910         .remove = rockchip_spi_remove,
 911 };
 912
 913 module_platform_driver(rockchip_spi_driver);
 914
 915 MODULE_AUTHOR("Addy Ke <addy.ke@rock-chips.com>");
 916 MODULE_DESCRIPTION("ROCKCHIP SPI Controller Driver");
 917 MODULE_LICENSE("GPL v2");