drivers/spi/spi-s3c64xx.c

   1 /*
   2  * Copyright (C) 2009 Samsung Electronics Ltd.
   3  *      Jaswinder Singh <jassi.brar@samsung.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <linux/init.h>
  17 #include <linux/module.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/delay.h>
  20 #include <linux/clk.h>
  21 #include <linux/dma-mapping.h>
  22 #include <linux/dmaengine.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/pm_runtime.h>
  25 #include <linux/spi/spi.h>
  26 #include <linux/gpio.h>
  27 #include <linux/of.h>
  28 #include <linux/of_gpio.h>
  29
  30 #include <linux/platform_data/spi-s3c64xx.h>
  31
  32 #define MAX_SPI_PORTS           6
  33 #define S3C64XX_SPI_QUIRK_POLL          (1 << 0)
  34 #define S3C64XX_SPI_QUIRK_CS_AUTO       (1 << 1)
  35 #define AUTOSUSPEND_TIMEOUT     2000
  36
  37 /* Registers and bit-fields */
  38
  39 #define S3C64XX_SPI_CH_CFG              0x00
  40 #define S3C64XX_SPI_CLK_CFG             0x04
  41 #define S3C64XX_SPI_MODE_CFG    0x08
  42 #define S3C64XX_SPI_SLAVE_SEL   0x0C
  43 #define S3C64XX_SPI_INT_EN              0x10
  44 #define S3C64XX_SPI_STATUS              0x14
  45 #define S3C64XX_SPI_TX_DATA             0x18
  46 #define S3C64XX_SPI_RX_DATA             0x1C
  47 #define S3C64XX_SPI_PACKET_CNT  0x20
  48 #define S3C64XX_SPI_PENDING_CLR 0x24
  49 #define S3C64XX_SPI_SWAP_CFG    0x28
  50 #define S3C64XX_SPI_FB_CLK              0x2C
  51
  52 #define S3C64XX_SPI_CH_HS_EN            (1<<6)  /* High Speed Enable */
  53 #define S3C64XX_SPI_CH_SW_RST           (1<<5)
  54 #define S3C64XX_SPI_CH_SLAVE            (1<<4)
  55 #define S3C64XX_SPI_CPOL_L              (1<<3)
  56 #define S3C64XX_SPI_CPHA_B              (1<<2)
  57 #define S3C64XX_SPI_CH_RXCH_ON          (1<<1)
  58 #define S3C64XX_SPI_CH_TXCH_ON          (1<<0)
  59
  60 #define S3C64XX_SPI_CLKSEL_SRCMSK       (3<<9)
  61 #define S3C64XX_SPI_CLKSEL_SRCSHFT      9
  62 #define S3C64XX_SPI_ENCLK_ENABLE        (1<<8)
  63 #define S3C64XX_SPI_PSR_MASK            0xff
  64
  65 #define S3C64XX_SPI_MODE_CH_TSZ_BYTE            (0<<29)
  66 #define S3C64XX_SPI_MODE_CH_TSZ_HALFWORD        (1<<29)
  67 #define S3C64XX_SPI_MODE_CH_TSZ_WORD            (2<<29)
  68 #define S3C64XX_SPI_MODE_CH_TSZ_MASK            (3<<29)
  69 #define S3C64XX_SPI_MODE_BUS_TSZ_BYTE           (0<<17)
  70 #define S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD       (1<<17)
  71 #define S3C64XX_SPI_MODE_BUS_TSZ_WORD           (2<<17)
  72 #define S3C64XX_SPI_MODE_BUS_TSZ_MASK           (3<<17)
  73 #define S3C64XX_SPI_MODE_RXDMA_ON               (1<<2)
  74 #define S3C64XX_SPI_MODE_TXDMA_ON               (1<<1)
  75 #define S3C64XX_SPI_MODE_4BURST                 (1<<0)
  76
  77 #define S3C64XX_SPI_SLAVE_AUTO                  (1<<1)
  78 #define S3C64XX_SPI_SLAVE_SIG_INACT             (1<<0)
  79 #define S3C64XX_SPI_SLAVE_NSC_CNT_2             (2<<4)
  80
  81 #define S3C64XX_SPI_INT_TRAILING_EN             (1<<6)
  82 #define S3C64XX_SPI_INT_RX_OVERRUN_EN           (1<<5)
  83 #define S3C64XX_SPI_INT_RX_UNDERRUN_EN          (1<<4)
  84 #define S3C64XX_SPI_INT_TX_OVERRUN_EN           (1<<3)
  85 #define S3C64XX_SPI_INT_TX_UNDERRUN_EN          (1<<2)
  86 #define S3C64XX_SPI_INT_RX_FIFORDY_EN           (1<<1)
  87 #define S3C64XX_SPI_INT_TX_FIFORDY_EN           (1<<0)
  88
  89 #define S3C64XX_SPI_ST_RX_OVERRUN_ERR           (1<<5)
  90 #define S3C64XX_SPI_ST_RX_UNDERRUN_ERR  (1<<4)
  91 #define S3C64XX_SPI_ST_TX_OVERRUN_ERR           (1<<3)
  92 #define S3C64XX_SPI_ST_TX_UNDERRUN_ERR  (1<<2)
  93 #define S3C64XX_SPI_ST_RX_FIFORDY               (1<<1)
  94 #define S3C64XX_SPI_ST_TX_FIFORDY               (1<<0)
  95
  96 #define S3C64XX_SPI_PACKET_CNT_EN               (1<<16)
  97
  98 #define S3C64XX_SPI_PND_TX_UNDERRUN_CLR         (1<<4)
  99 #define S3C64XX_SPI_PND_TX_OVERRUN_CLR          (1<<3)
 100 #define S3C64XX_SPI_PND_RX_UNDERRUN_CLR         (1<<2)
 101 #define S3C64XX_SPI_PND_RX_OVERRUN_CLR          (1<<1)
 102 #define S3C64XX_SPI_PND_TRAILING_CLR            (1<<0)
 103
 104 #define S3C64XX_SPI_SWAP_RX_HALF_WORD           (1<<7)
 105 #define S3C64XX_SPI_SWAP_RX_BYTE                (1<<6)
 106 #define S3C64XX_SPI_SWAP_RX_BIT                 (1<<5)
 107 #define S3C64XX_SPI_SWAP_RX_EN                  (1<<4)
 108 #define S3C64XX_SPI_SWAP_TX_HALF_WORD           (1<<3)
 109 #define S3C64XX_SPI_SWAP_TX_BYTE                (1<<2)
 110 #define S3C64XX_SPI_SWAP_TX_BIT                 (1<<1)
 111 #define S3C64XX_SPI_SWAP_TX_EN                  (1<<0)
 112
 113 #define S3C64XX_SPI_FBCLK_MSK           (3<<0)
 114
 115 #define FIFO_LVL_MASK(i) ((i)->port_conf->fifo_lvl_mask[i->port_id])
 116 #define S3C64XX_SPI_ST_TX_DONE(v, i) (((v) & \
 117                                 (1 << (i)->port_conf->tx_st_done)) ? 1 : 0)
 118 #define TX_FIFO_LVL(v, i) (((v) >> 6) & FIFO_LVL_MASK(i))
 119 #define RX_FIFO_LVL(v, i) (((v) >> (i)->port_conf->rx_lvl_offset) & \
 120                                         FIFO_LVL_MASK(i))
 121
 122 #define S3C64XX_SPI_MAX_TRAILCNT        0x3ff
 123 #define S3C64XX_SPI_TRAILCNT_OFF        19
 124
 125 #define S3C64XX_SPI_TRAILCNT            S3C64XX_SPI_MAX_TRAILCNT
 126
 127 #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
 128 #define is_polling(x)   (x->port_conf->quirks & S3C64XX_SPI_QUIRK_POLL)
 129
 130 #define RXBUSY    (1<<2)
 131 #define TXBUSY    (1<<3)
 132
 133 struct s3c64xx_spi_dma_data {
 134         struct dma_chan *ch;
 135         enum dma_transfer_direction direction;
 136 };
 137
 138 /**
 139  * struct s3c64xx_spi_info - SPI Controller hardware info
 140  * @fifo_lvl_mask: Bit-mask for {TX|RX}_FIFO_LVL bits in SPI_STATUS register.
 141  * @rx_lvl_offset: Bit offset of RX_FIFO_LVL bits in SPI_STATUS regiter.
 142  * @tx_st_done: Bit offset of TX_DONE bit in SPI_STATUS regiter.
 143  * @high_speed: True, if the controller supports HIGH_SPEED_EN bit.
 144  * @clk_from_cmu: True, if the controller does not include a clock mux and
 145  *      prescaler unit.
 146  *
 147  * The Samsung s3c64xx SPI controller are used on various Samsung SoC's but
 148  * differ in some aspects such as the size of the fifo and spi bus clock
 149  * setup. Such differences are specified to the driver using this structure
 150  * which is provided as driver data to the driver.
 151  */
 152 struct s3c64xx_spi_port_config {
 153         int     fifo_lvl_mask[MAX_SPI_PORTS];
 154         int     rx_lvl_offset;
 155         int     tx_st_done;
 156         int     quirks;
 157         bool    high_speed;
 158         bool    clk_from_cmu;
 159         bool    clk_ioclk;
 160 };
 161
 162 /**
 163  * struct s3c64xx_spi_driver_data - Runtime info holder for SPI driver.
 164  * @clk: Pointer to the spi clock.
 165  * @src_clk: Pointer to the clock used to generate SPI signals.
 166  * @ioclk: Pointer to the i/o clock between master and slave
 167  * @master: Pointer to the SPI Protocol master.
 168  * @cntrlr_info: Platform specific data for the controller this driver manages.
 169  * @tgl_spi: Pointer to the last CS left untoggled by the cs_change hint.
 170  * @lock: Controller specific lock.
 171  * @state: Set of FLAGS to indicate status.
 172  * @rx_dmach: Controller's DMA channel for Rx.
 173  * @tx_dmach: Controller's DMA channel for Tx.
 174  * @sfr_start: BUS address of SPI controller regs.
 175  * @regs: Pointer to ioremap'ed controller registers.
 176  * @irq: interrupt
 177  * @xfer_completion: To indicate completion of xfer task.
 178  * @cur_mode: Stores the active configuration of the controller.
 179  * @cur_bpw: Stores the active bits per word settings.
 180  * @cur_speed: Stores the active xfer clock speed.
 181  */
 182 struct s3c64xx_spi_driver_data {
 183         void __iomem                    *regs;
 184         struct clk                      *clk;
 185         struct clk                      *src_clk;
 186         struct clk                      *ioclk;
 187         struct platform_device          *pdev;
 188         struct spi_master               *master;
 189         struct s3c64xx_spi_info  *cntrlr_info;
 190         struct spi_device               *tgl_spi;
 191         spinlock_t                      lock;
 192         unsigned long                   sfr_start;
 193         struct completion               xfer_completion;
 194         unsigned                        state;
 195         unsigned                        cur_mode, cur_bpw;
 196         unsigned                        cur_speed;
 197         struct s3c64xx_spi_dma_data     rx_dma;
 198         struct s3c64xx_spi_dma_data     tx_dma;
 199         struct s3c64xx_spi_port_config  *port_conf;
 200         unsigned int                    port_id;
 201 };
 202
 203 static void flush_fifo(struct s3c64xx_spi_driver_data *sdd)
 204 {
 205         void __iomem *regs = sdd->regs;
 206         unsigned long loops;
 207         u32 val;
 208
 209         writel(0, regs + S3C64XX_SPI_PACKET_CNT);
 210
 211         val = readl(regs + S3C64XX_SPI_CH_CFG);
 212         val &= ~(S3C64XX_SPI_CH_RXCH_ON | S3C64XX_SPI_CH_TXCH_ON);
 213         writel(val, regs + S3C64XX_SPI_CH_CFG);
 214
 215         val = readl(regs + S3C64XX_SPI_CH_CFG);
 216         val |= S3C64XX_SPI_CH_SW_RST;
 217         val &= ~S3C64XX_SPI_CH_HS_EN;
 218         writel(val, regs + S3C64XX_SPI_CH_CFG);
 219
 220         /* Flush TxFIFO*/
 221         loops = msecs_to_loops(1);
 222         do {
 223                 val = readl(regs + S3C64XX_SPI_STATUS);
 224         } while (TX_FIFO_LVL(val, sdd) && loops--);
 225
 226         if (loops == 0)
 227                 dev_warn(&sdd->pdev->dev, "Timed out flushing TX FIFO\n");
 228
 229         /* Flush RxFIFO*/
 230         loops = msecs_to_loops(1);
 231         do {
 232                 val = readl(regs + S3C64XX_SPI_STATUS);
 233                 if (RX_FIFO_LVL(val, sdd))
 234                         readl(regs + S3C64XX_SPI_RX_DATA);
 235                 else
 236                         break;
 237         } while (loops--);
 238
 239         if (loops == 0)
 240                 dev_warn(&sdd->pdev->dev, "Timed out flushing RX FIFO\n");
 241
 242         val = readl(regs + S3C64XX_SPI_CH_CFG);
 243         val &= ~S3C64XX_SPI_CH_SW_RST;
 244         writel(val, regs + S3C64XX_SPI_CH_CFG);
 245
 246         val = readl(regs + S3C64XX_SPI_MODE_CFG);
 247         val &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON);
 248         writel(val, regs + S3C64XX_SPI_MODE_CFG);
 249 }
 250
 251 static void s3c64xx_spi_dmacb(void *data)
 252 {
 253         struct s3c64xx_spi_driver_data *sdd;
 254         struct s3c64xx_spi_dma_data *dma = data;
 255         unsigned long flags;
 256
 257         if (dma->direction == DMA_DEV_TO_MEM)
 258                 sdd = container_of(data,
 259                         struct s3c64xx_spi_driver_data, rx_dma);
 260         else
 261                 sdd = container_of(data,
 262                         struct s3c64xx_spi_driver_data, tx_dma);
 263
 264         spin_lock_irqsave(&sdd->lock, flags);
 265
 266         if (dma->direction == DMA_DEV_TO_MEM) {
 267                 sdd->state &= ~RXBUSY;
 268                 if (!(sdd->state & TXBUSY))
 269                         complete(&sdd->xfer_completion);
 270         } else {
 271                 sdd->state &= ~TXBUSY;
 272                 if (!(sdd->state & RXBUSY))
 273                         complete(&sdd->xfer_completion);
 274         }
 275
 276         spin_unlock_irqrestore(&sdd->lock, flags);
 277 }
 278
 279 static void prepare_dma(struct s3c64xx_spi_dma_data *dma,
 280                         struct sg_table *sgt)
 281 {
 282         struct s3c64xx_spi_driver_data *sdd;
 283         struct dma_slave_config config;
 284         struct dma_async_tx_descriptor *desc;
 285
 286         memset(&config, 0, sizeof(config));
 287
 288         if (dma->direction == DMA_DEV_TO_MEM) {
 289                 sdd = container_of((void *)dma,
 290                         struct s3c64xx_spi_driver_data, rx_dma);
 291                 config.direction = dma->direction;
 292                 config.src_addr = sdd->sfr_start + S3C64XX_SPI_RX_DATA;
 293                 config.src_addr_width = sdd->cur_bpw / 8;
 294                 config.src_maxburst = 1;
 295                 dmaengine_slave_config(dma->ch, &config);
 296         } else {
 297                 sdd = container_of((void *)dma,
 298                         struct s3c64xx_spi_driver_data, tx_dma);
 299                 config.direction = dma->direction;
 300                 config.dst_addr = sdd->sfr_start + S3C64XX_SPI_TX_DATA;
 301                 config.dst_addr_width = sdd->cur_bpw / 8;
 302                 config.dst_maxburst = 1;
 303                 dmaengine_slave_config(dma->ch, &config);
 304         }
 305
 306         desc = dmaengine_prep_slave_sg(dma->ch, sgt->sgl, sgt->nents,
 307                                        dma->direction, DMA_PREP_INTERRUPT);
 308
 309         desc->callback = s3c64xx_spi_dmacb;
 310         desc->callback_param = dma;
 311
 312         dmaengine_submit(desc);
 313         dma_async_issue_pending(dma->ch);
 314 }
 315
 316 static void s3c64xx_spi_set_cs(struct spi_device *spi, bool enable)
 317 {
 318         struct s3c64xx_spi_driver_data *sdd =
 319                                         spi_master_get_devdata(spi->master);
 320
 321         if (sdd->cntrlr_info->no_cs)
 322                 return;
 323
 324         if (enable) {
 325                 if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO)) {
 326                         writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
 327                 } else {
 328                         u32 ssel = readl(sdd->regs + S3C64XX_SPI_SLAVE_SEL);
 329
 330                         ssel |= (S3C64XX_SPI_SLAVE_AUTO |
 331                                                 S3C64XX_SPI_SLAVE_NSC_CNT_2);
 332                         writel(ssel, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
 333                 }
 334         } else {
 335                 if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO))
 336                         writel(S3C64XX_SPI_SLAVE_SIG_INACT,
 337                                sdd->regs + S3C64XX_SPI_SLAVE_SEL);
 338         }
 339 }
 340
 341 static int s3c64xx_spi_prepare_transfer(struct spi_master *spi)
 342 {
 343         struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi);
 344
 345         if (is_polling(sdd))
 346                 return 0;
 347
 348         spi->dma_rx = sdd->rx_dma.ch;
 349         spi->dma_tx = sdd->tx_dma.ch;
 350
 351         return 0;
 352 }
 353
 354 static bool s3c64xx_spi_can_dma(struct spi_master *master,
 355                                 struct spi_device *spi,
 356                                 struct spi_transfer *xfer)
 357 {
 358         struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
 359
 360         return xfer->len > (FIFO_LVL_MASK(sdd) >> 1) + 1;
 361 }
 362
 363 static void enable_datapath(struct s3c64xx_spi_driver_data *sdd,
 364                                 struct spi_device *spi,
 365                                 struct spi_transfer *xfer, int dma_mode)
 366 {
 367         void __iomem *regs = sdd->regs;
 368         u32 modecfg, chcfg;
 369
 370         modecfg = readl(regs + S3C64XX_SPI_MODE_CFG);
 371         modecfg &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON);
 372
 373         chcfg = readl(regs + S3C64XX_SPI_CH_CFG);
 374         chcfg &= ~S3C64XX_SPI_CH_TXCH_ON;
 375
 376         if (dma_mode) {
 377                 chcfg &= ~S3C64XX_SPI_CH_RXCH_ON;
 378         } else {
 379                 /* Always shift in data in FIFO, even if xfer is Tx only,
 380                  * this helps setting PCKT_CNT value for generating clocks
 381                  * as exactly needed.
 382                  */
 383                 chcfg |= S3C64XX_SPI_CH_RXCH_ON;
 384                 writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff)
 385                                         | S3C64XX_SPI_PACKET_CNT_EN,
 386                                         regs + S3C64XX_SPI_PACKET_CNT);
 387         }
 388
 389         if (xfer->tx_buf != NULL) {
 390                 sdd->state |= TXBUSY;
 391                 chcfg |= S3C64XX_SPI_CH_TXCH_ON;
 392                 if (dma_mode) {
 393                         modecfg |= S3C64XX_SPI_MODE_TXDMA_ON;
 394                         prepare_dma(&sdd->tx_dma, &xfer->tx_sg);
 395                 } else {
 396                         switch (sdd->cur_bpw) {
 397                         case 32:
 398                                 iowrite32_rep(regs + S3C64XX_SPI_TX_DATA,
 399                                         xfer->tx_buf, xfer->len / 4);
 400                                 break;
 401                         case 16:
 402                                 iowrite16_rep(regs + S3C64XX_SPI_TX_DATA,
 403                                         xfer->tx_buf, xfer->len / 2);
 404                                 break;
 405                         default:
 406                                 iowrite8_rep(regs + S3C64XX_SPI_TX_DATA,
 407                                         xfer->tx_buf, xfer->len);
 408                                 break;
 409                         }
 410                 }
 411         }
 412
 413         if (xfer->rx_buf != NULL) {
 414                 sdd->state |= RXBUSY;
 415
 416                 if (sdd->port_conf->high_speed && sdd->cur_speed >= 30000000UL
 417                                         && !(sdd->cur_mode & SPI_CPHA))
 418                         chcfg |= S3C64XX_SPI_CH_HS_EN;
 419
 420                 if (dma_mode) {
 421                         modecfg |= S3C64XX_SPI_MODE_RXDMA_ON;
 422                         chcfg |= S3C64XX_SPI_CH_RXCH_ON;
 423                         writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff)
 424                                         | S3C64XX_SPI_PACKET_CNT_EN,
 425                                         regs + S3C64XX_SPI_PACKET_CNT);
 426                         prepare_dma(&sdd->rx_dma, &xfer->rx_sg);
 427                 }
 428         }
 429
 430         writel(modecfg, regs + S3C64XX_SPI_MODE_CFG);
 431         writel(chcfg, regs + S3C64XX_SPI_CH_CFG);
 432 }
 433
 434 static u32 s3c64xx_spi_wait_for_timeout(struct s3c64xx_spi_driver_data *sdd,
 435                                         int timeout_ms)
 436 {
 437         void __iomem *regs = sdd->regs;
 438         unsigned long val = 1;
 439         u32 status;
 440
 441         /* max fifo depth available */
 442         u32 max_fifo = (FIFO_LVL_MASK(sdd) >> 1) + 1;
 443
 444         if (timeout_ms)
 445                 val = msecs_to_loops(timeout_ms);
 446
 447         do {
 448                 status = readl(regs + S3C64XX_SPI_STATUS);
 449         } while (RX_FIFO_LVL(status, sdd) < max_fifo && --val);
 450
 451         /* return the actual received data length */
 452         return RX_FIFO_LVL(status, sdd);
 453 }
 454
 455 static int wait_for_dma(struct s3c64xx_spi_driver_data *sdd,
 456                         struct spi_transfer *xfer)
 457 {
 458         void __iomem *regs = sdd->regs;
 459         unsigned long val;
 460         u32 status;
 461         int ms;
 462
 463         /* millisecs to xfer 'len' bytes @ 'cur_speed' */
 464         ms = xfer->len * 8 * 1000 / sdd->cur_speed;
 465         ms += 10; /* some tolerance */
 466
 467         val = msecs_to_jiffies(ms) + 10;
 468         val = wait_for_completion_timeout(&sdd->xfer_completion, val);
 469
 470         /*
 471          * If the previous xfer was completed within timeout, then
 472          * proceed further else return -EIO.
 473          * DmaTx returns after simply writing data in the FIFO,
 474          * w/o waiting for real transmission on the bus to finish.
 475          * DmaRx returns only after Dma read data from FIFO which
 476          * needs bus transmission to finish, so we don't worry if
 477          * Xfer involved Rx(with or without Tx).
 478          */
 479         if (val && !xfer->rx_buf) {
 480                 val = msecs_to_loops(10);
 481                 status = readl(regs + S3C64XX_SPI_STATUS);
 482                 while ((TX_FIFO_LVL(status, sdd)
 483                         || !S3C64XX_SPI_ST_TX_DONE(status, sdd))
 484                        && --val) {
 485                         cpu_relax();
 486                         status = readl(regs + S3C64XX_SPI_STATUS);
 487                 }
 488
 489         }
 490
 491         /* If timed out while checking rx/tx status return error */
 492         if (!val)
 493                 return -EIO;
 494
 495         return 0;
 496 }
 497
 498 static int wait_for_pio(struct s3c64xx_spi_driver_data *sdd,
 499                         struct spi_transfer *xfer)
 500 {
 501         void __iomem *regs = sdd->regs;
 502         unsigned long val;
 503         u32 status;
 504         int loops;
 505         u32 cpy_len;
 506         u8 *buf;
 507         int ms;
 508
 509         /* millisecs to xfer 'len' bytes @ 'cur_speed' */
 510         ms = xfer->len * 8 * 1000 / sdd->cur_speed;
 511         ms += 10; /* some tolerance */
 512
 513         val = msecs_to_loops(ms);
 514         do {
 515                 status = readl(regs + S3C64XX_SPI_STATUS);
 516         } while (RX_FIFO_LVL(status, sdd) < xfer->len && --val);
 517
 518
 519         /* If it was only Tx */
 520         if (!xfer->rx_buf) {
 521                 sdd->state &= ~TXBUSY;
 522                 return 0;
 523         }
 524
 525         /*
 526          * If the receive length is bigger than the controller fifo
 527          * size, calculate the loops and read the fifo as many times.
 528          * loops = length / max fifo size (calculated by using the
 529          * fifo mask).
 530          * For any size less than the fifo size the below code is
 531          * executed atleast once.
 532          */
 533         loops = xfer->len / ((FIFO_LVL_MASK(sdd) >> 1) + 1);
 534         buf = xfer->rx_buf;
 535         do {
 536                 /* wait for data to be received in the fifo */
 537                 cpy_len = s3c64xx_spi_wait_for_timeout(sdd,
 538                                                        (loops ? ms : 0));
 539
 540                 switch (sdd->cur_bpw) {
 541                 case 32:
 542                         ioread32_rep(regs + S3C64XX_SPI_RX_DATA,
 543                                      buf, cpy_len / 4);
 544                         break;
 545                 case 16:
 546                         ioread16_rep(regs + S3C64XX_SPI_RX_DATA,
 547                                      buf, cpy_len / 2);
 548                         break;
 549                 default:
 550                         ioread8_rep(regs + S3C64XX_SPI_RX_DATA,
 551                                     buf, cpy_len);
 552                         break;
 553                 }
 554
 555                 buf = buf + cpy_len;
 556         } while (loops--);
 557         sdd->state &= ~RXBUSY;
 558
 559         return 0;
 560 }
 561
 562 static void s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd)
 563 {
 564         void __iomem *regs = sdd->regs;
 565         u32 val;
 566
 567         /* Disable Clock */
 568         if (!sdd->port_conf->clk_from_cmu) {
 569                 val = readl(regs + S3C64XX_SPI_CLK_CFG);
 570                 val &= ~S3C64XX_SPI_ENCLK_ENABLE;
 571                 writel(val, regs + S3C64XX_SPI_CLK_CFG);
 572         }
 573
 574         /* Set Polarity and Phase */
 575         val = readl(regs + S3C64XX_SPI_CH_CFG);
 576         val &= ~(S3C64XX_SPI_CH_SLAVE |
 577                         S3C64XX_SPI_CPOL_L |
 578                         S3C64XX_SPI_CPHA_B);
 579
 580         if (sdd->cur_mode & SPI_CPOL)
 581                 val |= S3C64XX_SPI_CPOL_L;
 582
 583         if (sdd->cur_mode & SPI_CPHA)
 584                 val |= S3C64XX_SPI_CPHA_B;
 585
 586         writel(val, regs + S3C64XX_SPI_CH_CFG);
 587
 588         /* Set Channel & DMA Mode */
 589         val = readl(regs + S3C64XX_SPI_MODE_CFG);
 590         val &= ~(S3C64XX_SPI_MODE_BUS_TSZ_MASK
 591                         | S3C64XX_SPI_MODE_CH_TSZ_MASK);
 592
 593         switch (sdd->cur_bpw) {
 594         case 32:
 595                 val |= S3C64XX_SPI_MODE_BUS_TSZ_WORD;
 596                 val |= S3C64XX_SPI_MODE_CH_TSZ_WORD;
 597                 break;
 598         case 16:
 599                 val |= S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD;
 600                 val |= S3C64XX_SPI_MODE_CH_TSZ_HALFWORD;
 601                 break;
 602         default:
 603                 val |= S3C64XX_SPI_MODE_BUS_TSZ_BYTE;
 604                 val |= S3C64XX_SPI_MODE_CH_TSZ_BYTE;
 605                 break;
 606         }
 607
 608         writel(val, regs + S3C64XX_SPI_MODE_CFG);
 609
 610         if (sdd->port_conf->clk_from_cmu) {
 611                 /* The src_clk clock is divided internally by 2 */
 612                 clk_set_rate(sdd->src_clk, sdd->cur_speed * 2);
 613         } else {
 614                 /* Configure Clock */
 615                 val = readl(regs + S3C64XX_SPI_CLK_CFG);
 616                 val &= ~S3C64XX_SPI_PSR_MASK;
 617                 val |= ((clk_get_rate(sdd->src_clk) / sdd->cur_speed / 2 - 1)
 618                                 & S3C64XX_SPI_PSR_MASK);
 619                 writel(val, regs + S3C64XX_SPI_CLK_CFG);
 620
 621                 /* Enable Clock */
 622                 val = readl(regs + S3C64XX_SPI_CLK_CFG);
 623                 val |= S3C64XX_SPI_ENCLK_ENABLE;
 624                 writel(val, regs + S3C64XX_SPI_CLK_CFG);
 625         }
 626 }
 627
 628 #define XFER_DMAADDR_INVALID DMA_BIT_MASK(32)
 629
 630 static int s3c64xx_spi_prepare_message(struct spi_master *master,
 631                                        struct spi_message *msg)
 632 {
 633         struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
 634         struct spi_device *spi = msg->spi;
 635         struct s3c64xx_spi_csinfo *cs = spi->controller_data;
 636
 637         /* Configure feedback delay */
 638         writel(cs->fb_delay & 0x3, sdd->regs + S3C64XX_SPI_FB_CLK);
 639
 640         return 0;
 641 }
 642
 643 static int s3c64xx_spi_transfer_one(struct spi_master *master,
 644                                     struct spi_device *spi,
 645                                     struct spi_transfer *xfer)
 646 {
 647         struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
 648         int status;
 649         u32 speed;
 650         u8 bpw;
 651         unsigned long flags;
 652         int use_dma;
 653
 654         reinit_completion(&sdd->xfer_completion);
 655
 656         /* Only BPW and Speed may change across transfers */
 657         bpw = xfer->bits_per_word;
 658         speed = xfer->speed_hz;
 659
 660         if (bpw != sdd->cur_bpw || speed != sdd->cur_speed) {
 661                 sdd->cur_bpw = bpw;
 662                 sdd->cur_speed = speed;
 663                 sdd->cur_mode = spi->mode;
 664                 s3c64xx_spi_config(sdd);
 665         }
 666
 667         /* Polling method for xfers not bigger than FIFO capacity */
 668         use_dma = 0;
 669         if (!is_polling(sdd) &&
 670             (sdd->rx_dma.ch && sdd->tx_dma.ch &&
 671              (xfer->len > ((FIFO_LVL_MASK(sdd) >> 1) + 1))))
 672                 use_dma = 1;
 673
 674         spin_lock_irqsave(&sdd->lock, flags);
 675
 676         /* Pending only which is to be done */
 677         sdd->state &= ~RXBUSY;
 678         sdd->state &= ~TXBUSY;
 679
 680         enable_datapath(sdd, spi, xfer, use_dma);
 681
 682         /* Start the signals */
 683         s3c64xx_spi_set_cs(spi, true);
 684
 685         spin_unlock_irqrestore(&sdd->lock, flags);
 686
 687         if (use_dma)
 688                 status = wait_for_dma(sdd, xfer);
 689         else
 690                 status = wait_for_pio(sdd, xfer);
 691
 692         if (status) {
 693                 dev_err(&spi->dev, "I/O Error: rx-%d tx-%d res:rx-%c tx-%c len-%d\n",
 694                         xfer->rx_buf ? 1 : 0, xfer->tx_buf ? 1 : 0,
 695                         (sdd->state & RXBUSY) ? 'f' : 'p',
 696                         (sdd->state & TXBUSY) ? 'f' : 'p',
 697                         xfer->len);
 698
 699                 if (use_dma) {
 700                         if (xfer->tx_buf != NULL
 701                             && (sdd->state & TXBUSY))
 702                                 dmaengine_terminate_all(sdd->tx_dma.ch);
 703                         if (xfer->rx_buf != NULL
 704                             && (sdd->state & RXBUSY))
 705                                 dmaengine_terminate_all(sdd->rx_dma.ch);
 706                 }
 707         } else {
 708                 flush_fifo(sdd);
 709         }
 710
 711         return status;
 712 }
 713
 714 static struct s3c64xx_spi_csinfo *s3c64xx_get_slave_ctrldata(
 715                                 struct spi_device *spi)
 716 {
 717         struct s3c64xx_spi_csinfo *cs;
 718         struct device_node *slave_np, *data_np = NULL;
 719         u32 fb_delay = 0;
 720
 721         slave_np = spi->dev.of_node;
 722         if (!slave_np) {
 723                 dev_err(&spi->dev, "device node not found\n");
 724                 return ERR_PTR(-EINVAL);
 725         }
 726
 727         data_np = of_get_child_by_name(slave_np, "controller-data");
 728         if (!data_np) {
 729                 dev_err(&spi->dev, "child node 'controller-data' not found\n");
 730                 return ERR_PTR(-EINVAL);
 731         }
 732
 733         cs = kzalloc(sizeof(*cs), GFP_KERNEL);
 734         if (!cs) {
 735                 of_node_put(data_np);
 736                 return ERR_PTR(-ENOMEM);
 737         }
 738
 739         of_property_read_u32(data_np, "samsung,spi-feedback-delay", &fb_delay);
 740         cs->fb_delay = fb_delay;
 741         of_node_put(data_np);
 742         return cs;
 743 }
 744
 745 /*
 746  * Here we only check the validity of requested configuration
 747  * and save the configuration in a local data-structure.
 748  * The controller is actually configured only just before we
 749  * get a message to transfer.
 750  */
 751 static int s3c64xx_spi_setup(struct spi_device *spi)
 752 {
 753         struct s3c64xx_spi_csinfo *cs = spi->controller_data;
 754         struct s3c64xx_spi_driver_data *sdd;
 755         int err;
 756
 757         sdd = spi_master_get_devdata(spi->master);
 758         if (spi->dev.of_node) {
 759                 cs = s3c64xx_get_slave_ctrldata(spi);
 760                 spi->controller_data = cs;
 761         } else if (cs) {
 762                 /* On non-DT platforms the SPI core will set spi->cs_gpio
 763                  * to -ENOENT. The GPIO pin used to drive the chip select
 764                  * is defined by using platform data so spi->cs_gpio value
 765                  * has to be override to have the proper GPIO pin number.
 766                  */
 767                 spi->cs_gpio = cs->line;
 768         }
 769
 770         if (IS_ERR_OR_NULL(cs)) {
 771                 dev_err(&spi->dev, "No CS for SPI(%d)\n", spi->chip_select);
 772                 return -ENODEV;
 773         }
 774
 775         if (!spi_get_ctldata(spi)) {
 776                 if (gpio_is_valid(spi->cs_gpio)) {
 777                         err = gpio_request_one(spi->cs_gpio, GPIOF_OUT_INIT_HIGH,
 778                                                dev_name(&spi->dev));
 779                         if (err) {
 780                                 dev_err(&spi->dev,
 781                                         "Failed to get /CS gpio [%d]: %d\n",
 782                                         spi->cs_gpio, err);
 783                                 goto err_gpio_req;
 784                         }
 785                 }
 786
 787                 spi_set_ctldata(spi, cs);
 788         }
 789
 790         pm_runtime_get_sync(&sdd->pdev->dev);
 791
 792         /* Check if we can provide the requested rate */
 793         if (!sdd->port_conf->clk_from_cmu) {
 794                 u32 psr, speed;
 795
 796                 /* Max possible */
 797                 speed = clk_get_rate(sdd->src_clk) / 2 / (0 + 1);
 798
 799                 if (spi->max_speed_hz > speed)
 800                         spi->max_speed_hz = speed;
 801
 802                 psr = clk_get_rate(sdd->src_clk) / 2 / spi->max_speed_hz - 1;
 803                 psr &= S3C64XX_SPI_PSR_MASK;
 804                 if (psr == S3C64XX_SPI_PSR_MASK)
 805                         psr--;
 806
 807                 speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1);
 808                 if (spi->max_speed_hz < speed) {
 809                         if (psr+1 < S3C64XX_SPI_PSR_MASK) {
 810                                 psr++;
 811                         } else {
 812                                 err = -EINVAL;
 813                                 goto setup_exit;
 814                         }
 815                 }
 816
 817                 speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1);
 818                 if (spi->max_speed_hz >= speed) {
 819                         spi->max_speed_hz = speed;
 820                 } else {
 821                         dev_err(&spi->dev, "Can't set %dHz transfer speed\n",
 822                                 spi->max_speed_hz);
 823                         err = -EINVAL;
 824                         goto setup_exit;
 825                 }
 826         }
 827
 828         pm_runtime_mark_last_busy(&sdd->pdev->dev);
 829         pm_runtime_put_autosuspend(&sdd->pdev->dev);
 830         s3c64xx_spi_set_cs(spi, false);
 831
 832         return 0;
 833
 834 setup_exit:
 835         pm_runtime_mark_last_busy(&sdd->pdev->dev);
 836         pm_runtime_put_autosuspend(&sdd->pdev->dev);
 837         /* setup() returns with device de-selected */
 838         s3c64xx_spi_set_cs(spi, false);
 839
 840         if (gpio_is_valid(spi->cs_gpio))
 841                 gpio_free(spi->cs_gpio);
 842         spi_set_ctldata(spi, NULL);
 843
 844 err_gpio_req:
 845         if (spi->dev.of_node)
 846                 kfree(cs);
 847
 848         return err;
 849 }
 850
 851 static void s3c64xx_spi_cleanup(struct spi_device *spi)
 852 {
 853         struct s3c64xx_spi_csinfo *cs = spi_get_ctldata(spi);
 854
 855         if (gpio_is_valid(spi->cs_gpio)) {
 856                 gpio_free(spi->cs_gpio);
 857                 if (spi->dev.of_node)
 858                         kfree(cs);
 859                 else {
 860                         /* On non-DT platforms, the SPI core sets
 861                          * spi->cs_gpio to -ENOENT and .setup()
 862                          * overrides it with the GPIO pin value
 863                          * passed using platform data.
 864                          */
 865                         spi->cs_gpio = -ENOENT;
 866                 }
 867         }
 868
 869         spi_set_ctldata(spi, NULL);
 870 }
 871
 872 static irqreturn_t s3c64xx_spi_irq(int irq, void *data)
 873 {
 874         struct s3c64xx_spi_driver_data *sdd = data;
 875         struct spi_master *spi = sdd->master;
 876         unsigned int val, clr = 0;
 877
 878         val = readl(sdd->regs + S3C64XX_SPI_STATUS);
 879
 880         if (val & S3C64XX_SPI_ST_RX_OVERRUN_ERR) {
 881                 clr = S3C64XX_SPI_PND_RX_OVERRUN_CLR;
 882                 dev_err(&spi->dev, "RX overrun\n");
 883         }
 884         if (val & S3C64XX_SPI_ST_RX_UNDERRUN_ERR) {
 885                 clr |= S3C64XX_SPI_PND_RX_UNDERRUN_CLR;
 886                 dev_err(&spi->dev, "RX underrun\n");
 887         }
 888         if (val & S3C64XX_SPI_ST_TX_OVERRUN_ERR) {
 889                 clr |= S3C64XX_SPI_PND_TX_OVERRUN_CLR;
 890                 dev_err(&spi->dev, "TX overrun\n");
 891         }
 892         if (val & S3C64XX_SPI_ST_TX_UNDERRUN_ERR) {
 893                 clr |= S3C64XX_SPI_PND_TX_UNDERRUN_CLR;
 894                 dev_err(&spi->dev, "TX underrun\n");
 895         }
 896
 897         /* Clear the pending irq by setting and then clearing it */
 898         writel(clr, sdd->regs + S3C64XX_SPI_PENDING_CLR);
 899         writel(0, sdd->regs + S3C64XX_SPI_PENDING_CLR);
 900
 901         return IRQ_HANDLED;
 902 }
 903
 904 static void s3c64xx_spi_hwinit(struct s3c64xx_spi_driver_data *sdd, int channel)
 905 {
 906         struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
 907         void __iomem *regs = sdd->regs;
 908         unsigned int val;
 909
 910         sdd->cur_speed = 0;
 911
 912         if (sci->no_cs)
 913                 writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
 914         else if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO))
 915                 writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
 916
 917         /* Disable Interrupts - we use Polling if not DMA mode */
 918         writel(0, regs + S3C64XX_SPI_INT_EN);
 919
 920         if (!sdd->port_conf->clk_from_cmu)
 921                 writel(sci->src_clk_nr << S3C64XX_SPI_CLKSEL_SRCSHFT,
 922                                 regs + S3C64XX_SPI_CLK_CFG);
 923         writel(0, regs + S3C64XX_SPI_MODE_CFG);
 924         writel(0, regs + S3C64XX_SPI_PACKET_CNT);
 925
 926         /* Clear any irq pending bits, should set and clear the bits */
 927         val = S3C64XX_SPI_PND_RX_OVERRUN_CLR |
 928                 S3C64XX_SPI_PND_RX_UNDERRUN_CLR |
 929                 S3C64XX_SPI_PND_TX_OVERRUN_CLR |
 930                 S3C64XX_SPI_PND_TX_UNDERRUN_CLR;
 931         writel(val, regs + S3C64XX_SPI_PENDING_CLR);
 932         writel(0, regs + S3C64XX_SPI_PENDING_CLR);
 933
 934         writel(0, regs + S3C64XX_SPI_SWAP_CFG);
 935
 936         val = readl(regs + S3C64XX_SPI_MODE_CFG);
 937         val &= ~S3C64XX_SPI_MODE_4BURST;
 938         val &= ~(S3C64XX_SPI_MAX_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF);
 939         val |= (S3C64XX_SPI_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF);
 940         writel(val, regs + S3C64XX_SPI_MODE_CFG);
 941
 942         flush_fifo(sdd);
 943 }
 944
 945 #ifdef CONFIG_OF
 946 static struct s3c64xx_spi_info *s3c64xx_spi_parse_dt(struct device *dev)
 947 {
 948         struct s3c64xx_spi_info *sci;
 949         u32 temp;
 950
 951         sci = devm_kzalloc(dev, sizeof(*sci), GFP_KERNEL);
 952         if (!sci)
 953                 return ERR_PTR(-ENOMEM);
 954
 955         if (of_property_read_u32(dev->of_node, "samsung,spi-src-clk", &temp)) {
 956                 dev_warn(dev, "spi bus clock parent not specified, using clock at index 0 as parent\n");
 957                 sci->src_clk_nr = 0;
 958         } else {
 959                 sci->src_clk_nr = temp;
 960         }
 961
 962         if (of_property_read_u32(dev->of_node, "num-cs", &temp)) {
 963                 dev_warn(dev, "number of chip select lines not specified, assuming 1 chip select line\n");
 964                 sci->num_cs = 1;
 965         } else {
 966                 sci->num_cs = temp;
 967         }
 968
 969         sci->no_cs = of_property_read_bool(dev->of_node, "no-cs-readback");
 970
 971         return sci;
 972 }
 973 #else
 974 static struct s3c64xx_spi_info *s3c64xx_spi_parse_dt(struct device *dev)
 975 {
 976         return dev_get_platdata(dev);
 977 }
 978 #endif
 979
 980 static const struct of_device_id s3c64xx_spi_dt_match[];
 981
 982 static inline struct s3c64xx_spi_port_config *s3c64xx_spi_get_port_config(
 983                                                 struct platform_device *pdev)
 984 {
 985 #ifdef CONFIG_OF
 986         if (pdev->dev.of_node) {
 987                 const struct of_device_id *match;
 988                 match = of_match_node(s3c64xx_spi_dt_match, pdev->dev.of_node);
 989                 return (struct s3c64xx_spi_port_config *)match->data;
 990         }
 991 #endif
 992         return (struct s3c64xx_spi_port_config *)
 993                          platform_get_device_id(pdev)->driver_data;
 994 }
 995
 996 static int s3c64xx_spi_probe(struct platform_device *pdev)
 997 {
 998         struct resource *mem_res;
 999         struct s3c64xx_spi_driver_data *sdd;
1000         struct s3c64xx_spi_info *sci = dev_get_platdata(&pdev->dev);
1001         struct spi_master *master;
1002         int ret, irq;
1003         char clk_name[16];
1004
1005         if (!sci && pdev->dev.of_node) {
1006                 sci = s3c64xx_spi_parse_dt(&pdev->dev);
1007                 if (IS_ERR(sci))
1008                         return PTR_ERR(sci);
1009         }
1010
1011         if (!sci) {
1012                 dev_err(&pdev->dev, "platform_data missing!\n");
1013                 return -ENODEV;
1014         }
1015
1016         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1017         if (mem_res == NULL) {
1018                 dev_err(&pdev->dev, "Unable to get SPI MEM resource\n");
1019                 return -ENXIO;
1020         }
1021
1022         irq = platform_get_irq(pdev, 0);
1023         if (irq < 0) {
1024                 dev_warn(&pdev->dev, "Failed to get IRQ: %d\n", irq);
1025                 return irq;
1026         }
1027
1028         master = spi_alloc_master(&pdev->dev,
1029                                 sizeof(struct s3c64xx_spi_driver_data));
1030         if (master == NULL) {
1031                 dev_err(&pdev->dev, "Unable to allocate SPI Master\n");
1032                 return -ENOMEM;
1033         }
1034
1035         platform_set_drvdata(pdev, master);
1036
1037         sdd = spi_master_get_devdata(master);
1038         sdd->port_conf = s3c64xx_spi_get_port_config(pdev);
1039         sdd->master = master;
1040         sdd->cntrlr_info = sci;
1041         sdd->pdev = pdev;
1042         sdd->sfr_start = mem_res->start;
1043         if (pdev->dev.of_node) {
1044                 ret = of_alias_get_id(pdev->dev.of_node, "spi");
1045                 if (ret < 0) {
1046                         dev_err(&pdev->dev, "failed to get alias id, errno %d\n",
1047                                 ret);
1048                         goto err_deref_master;
1049                 }
1050                 sdd->port_id = ret;
1051         } else {
1052                 sdd->port_id = pdev->id;
1053         }
1054
1055         sdd->cur_bpw = 8;
1056
1057         sdd->tx_dma.direction = DMA_MEM_TO_DEV;
1058         sdd->rx_dma.direction = DMA_DEV_TO_MEM;
1059
1060         master->dev.of_node = pdev->dev.of_node;
1061         master->bus_num = sdd->port_id;
1062         master->setup = s3c64xx_spi_setup;
1063         master->cleanup = s3c64xx_spi_cleanup;
1064         master->prepare_transfer_hardware = s3c64xx_spi_prepare_transfer;
1065         master->prepare_message = s3c64xx_spi_prepare_message;
1066         master->transfer_one = s3c64xx_spi_transfer_one;
1067         master->num_chipselect = sci->num_cs;
1068         master->dma_alignment = 8;
1069         master->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(16) |
1070                                         SPI_BPW_MASK(8);
1071         /* the spi->mode bits understood by this driver: */
1072         master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
1073         master->auto_runtime_pm = true;
1074         if (!is_polling(sdd))
1075                 master->can_dma = s3c64xx_spi_can_dma;
1076
1077         sdd->regs = devm_ioremap_resource(&pdev->dev, mem_res);
1078         if (IS_ERR(sdd->regs)) {
1079                 ret = PTR_ERR(sdd->regs);
1080                 goto err_deref_master;
1081         }
1082
1083         if (sci->cfg_gpio && sci->cfg_gpio()) {
1084                 dev_err(&pdev->dev, "Unable to config gpio\n");
1085                 ret = -EBUSY;
1086                 goto err_deref_master;
1087         }
1088
1089         /* Setup clocks */
1090         sdd->clk = devm_clk_get(&pdev->dev, "spi");
1091         if (IS_ERR(sdd->clk)) {
1092                 dev_err(&pdev->dev, "Unable to acquire clock 'spi'\n");
1093                 ret = PTR_ERR(sdd->clk);
1094                 goto err_deref_master;
1095         }
1096
1097         ret = clk_prepare_enable(sdd->clk);
1098         if (ret) {
1099                 dev_err(&pdev->dev, "Couldn't enable clock 'spi'\n");
1100                 goto err_deref_master;
1101         }
1102
1103         sprintf(clk_name, "spi_busclk%d", sci->src_clk_nr);
1104         sdd->src_clk = devm_clk_get(&pdev->dev, clk_name);
1105         if (IS_ERR(sdd->src_clk)) {
1106                 dev_err(&pdev->dev,
1107                         "Unable to acquire clock '%s'\n", clk_name);
1108                 ret = PTR_ERR(sdd->src_clk);
1109                 goto err_disable_clk;
1110         }
1111
1112         ret = clk_prepare_enable(sdd->src_clk);
1113         if (ret) {
1114                 dev_err(&pdev->dev, "Couldn't enable clock '%s'\n", clk_name);
1115                 goto err_disable_clk;
1116         }
1117
1118         if (sdd->port_conf->clk_ioclk) {
1119                 sdd->ioclk = devm_clk_get(&pdev->dev, "spi_ioclk");
1120                 if (IS_ERR(sdd->ioclk)) {
1121                         dev_err(&pdev->dev, "Unable to acquire 'ioclk'\n");
1122                         ret = PTR_ERR(sdd->ioclk);
1123                         goto err_disable_src_clk;
1124                 }
1125
1126                 ret = clk_prepare_enable(sdd->ioclk);
1127                 if (ret) {
1128                         dev_err(&pdev->dev, "Couldn't enable clock 'ioclk'\n");
1129                         goto err_disable_src_clk;
1130                 }
1131         }
1132
1133         if (!is_polling(sdd)) {
1134                 /* Acquire DMA channels */
1135                 sdd->rx_dma.ch = dma_request_slave_channel_reason(&pdev->dev,
1136                                                                   "rx");
1137                 if (IS_ERR(sdd->rx_dma.ch)) {
1138                         dev_err(&pdev->dev, "Failed to get RX DMA channel\n");
1139                         ret = PTR_ERR(sdd->rx_dma.ch);
1140                         goto err_disable_io_clk;
1141                 }
1142                 sdd->tx_dma.ch = dma_request_slave_channel_reason(&pdev->dev,
1143                                                                   "tx");
1144                 if (IS_ERR(sdd->tx_dma.ch)) {
1145                         dev_err(&pdev->dev, "Failed to get TX DMA channel\n");
1146                         ret = PTR_ERR(sdd->tx_dma.ch);
1147                         goto err_release_rx_dma;
1148                 }
1149         }
1150
1151         pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_TIMEOUT);
1152         pm_runtime_use_autosuspend(&pdev->dev);
1153         pm_runtime_set_active(&pdev->dev);
1154         pm_runtime_enable(&pdev->dev);
1155         pm_runtime_get_sync(&pdev->dev);
1156
1157         /* Setup Deufult Mode */
1158         s3c64xx_spi_hwinit(sdd, sdd->port_id);
1159
1160         spin_lock_init(&sdd->lock);
1161         init_completion(&sdd->xfer_completion);
1162
1163         ret = devm_request_irq(&pdev->dev, irq, s3c64xx_spi_irq, 0,
1164                                 "spi-s3c64xx", sdd);
1165         if (ret != 0) {
1166                 dev_err(&pdev->dev, "Failed to request IRQ %d: %d\n",
1167                         irq, ret);
1168                 goto err_pm_put;
1169         }
1170
1171         writel(S3C64XX_SPI_INT_RX_OVERRUN_EN | S3C64XX_SPI_INT_RX_UNDERRUN_EN |
1172                S3C64XX_SPI_INT_TX_OVERRUN_EN | S3C64XX_SPI_INT_TX_UNDERRUN_EN,
1173                sdd->regs + S3C64XX_SPI_INT_EN);
1174
1175         ret = devm_spi_register_master(&pdev->dev, master);
1176         if (ret != 0) {
1177                 dev_err(&pdev->dev, "cannot register SPI master: %d\n", ret);
1178                 goto err_pm_put;
1179         }
1180
1181         dev_dbg(&pdev->dev, "Samsung SoC SPI Driver loaded for Bus SPI-%d with %d Slaves attached\n",
1182                                         sdd->port_id, master->num_chipselect);
1183         dev_dbg(&pdev->dev, "\tIOmem=[%pR]\tFIFO %dbytes\n",
1184                                         mem_res, (FIFO_LVL_MASK(sdd) >> 1) + 1);
1185
1186         pm_runtime_mark_last_busy(&pdev->dev);
1187         pm_runtime_put_autosuspend(&pdev->dev);
1188
1189         return 0;
1190
1191 err_pm_put:
1192         pm_runtime_put_noidle(&pdev->dev);
1193         pm_runtime_disable(&pdev->dev);
1194         pm_runtime_set_suspended(&pdev->dev);
1195
1196         if (!is_polling(sdd))
1197                 dma_release_channel(sdd->tx_dma.ch);
1198 err_release_rx_dma:
1199         if (!is_polling(sdd))
1200                 dma_release_channel(sdd->rx_dma.ch);
1201 err_disable_io_clk:
1202         clk_disable_unprepare(sdd->ioclk);
1203 err_disable_src_clk:
1204         clk_disable_unprepare(sdd->src_clk);
1205 err_disable_clk:
1206         clk_disable_unprepare(sdd->clk);
1207 err_deref_master:
1208         spi_master_put(master);
1209
1210         return ret;
1211 }
1212
1213 static int s3c64xx_spi_remove(struct platform_device *pdev)
1214 {
1215         struct spi_master *master = platform_get_drvdata(pdev);
1216         struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1217
1218         pm_runtime_get_sync(&pdev->dev);
1219
1220         writel(0, sdd->regs + S3C64XX_SPI_INT_EN);
1221
1222         if (!is_polling(sdd)) {
1223                 dma_release_channel(sdd->rx_dma.ch);
1224                 dma_release_channel(sdd->tx_dma.ch);
1225         }
1226
1227         clk_disable_unprepare(sdd->ioclk);
1228
1229         clk_disable_unprepare(sdd->src_clk);
1230
1231         clk_disable_unprepare(sdd->clk);
1232
1233         pm_runtime_put_noidle(&pdev->dev);
1234         pm_runtime_disable(&pdev->dev);
1235         pm_runtime_set_suspended(&pdev->dev);
1236
1237         return 0;
1238 }
1239
1240 #ifdef CONFIG_PM_SLEEP
1241 static int s3c64xx_spi_suspend(struct device *dev)
1242 {
1243         struct spi_master *master = dev_get_drvdata(dev);
1244         struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1245
1246         int ret = spi_master_suspend(master);
1247         if (ret)
1248                 return ret;
1249
1250         ret = pm_runtime_force_suspend(dev);
1251         if (ret < 0)
1252                 return ret;
1253
1254         sdd->cur_speed = 0; /* Output Clock is stopped */
1255
1256         return 0;
1257 }
1258
1259 static int s3c64xx_spi_resume(struct device *dev)
1260 {
1261         struct spi_master *master = dev_get_drvdata(dev);
1262         struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1263         struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
1264         int ret;
1265
1266         if (sci->cfg_gpio)
1267                 sci->cfg_gpio();
1268
1269         ret = pm_runtime_force_resume(dev);
1270         if (ret < 0)
1271                 return ret;
1272
1273         s3c64xx_spi_hwinit(sdd, sdd->port_id);
1274
1275         return spi_master_resume(master);
1276 }
1277 #endif /* CONFIG_PM_SLEEP */
1278
1279 #ifdef CONFIG_PM
1280 static int s3c64xx_spi_runtime_suspend(struct device *dev)
1281 {
1282         struct spi_master *master = dev_get_drvdata(dev);
1283         struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1284
1285         clk_disable_unprepare(sdd->clk);
1286         clk_disable_unprepare(sdd->src_clk);
1287         clk_disable_unprepare(sdd->ioclk);
1288
1289         return 0;
1290 }
1291
1292 static int s3c64xx_spi_runtime_resume(struct device *dev)
1293 {
1294         struct spi_master *master = dev_get_drvdata(dev);
1295         struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1296         int ret;
1297
1298         if (sdd->port_conf->clk_ioclk) {
1299                 ret = clk_prepare_enable(sdd->ioclk);
1300                 if (ret != 0)
1301                         return ret;
1302         }
1303
1304         ret = clk_prepare_enable(sdd->src_clk);
1305         if (ret != 0)
1306                 goto err_disable_ioclk;
1307
1308         ret = clk_prepare_enable(sdd->clk);
1309         if (ret != 0)
1310                 goto err_disable_src_clk;
1311
1312         return 0;
1313
1314 err_disable_src_clk:
1315         clk_disable_unprepare(sdd->src_clk);
1316 err_disable_ioclk:
1317         clk_disable_unprepare(sdd->ioclk);
1318
1319         return ret;
1320 }
1321 #endif /* CONFIG_PM */
1322
1323 static const struct dev_pm_ops s3c64xx_spi_pm = {
1324         SET_SYSTEM_SLEEP_PM_OPS(s3c64xx_spi_suspend, s3c64xx_spi_resume)
1325         SET_RUNTIME_PM_OPS(s3c64xx_spi_runtime_suspend,
1326                            s3c64xx_spi_runtime_resume, NULL)
1327 };
1328
1329 static struct s3c64xx_spi_port_config s3c2443_spi_port_config = {
1330         .fifo_lvl_mask  = { 0x7f },
1331         .rx_lvl_offset  = 13,
1332         .tx_st_done     = 21,
1333         .high_speed     = true,
1334 };
1335
1336 static struct s3c64xx_spi_port_config s3c6410_spi_port_config = {
1337         .fifo_lvl_mask  = { 0x7f, 0x7F },
1338         .rx_lvl_offset  = 13,
1339         .tx_st_done     = 21,
1340 };
1341
1342 static struct s3c64xx_spi_port_config s5pv210_spi_port_config = {
1343         .fifo_lvl_mask  = { 0x1ff, 0x7F },
1344         .rx_lvl_offset  = 15,
1345         .tx_st_done     = 25,
1346         .high_speed     = true,
1347 };
1348
1349 static struct s3c64xx_spi_port_config exynos4_spi_port_config = {
1350         .fifo_lvl_mask  = { 0x1ff, 0x7F, 0x7F },
1351         .rx_lvl_offset  = 15,
1352         .tx_st_done     = 25,
1353         .high_speed     = true,
1354         .clk_from_cmu   = true,
1355 };
1356
1357 static struct s3c64xx_spi_port_config exynos5440_spi_port_config = {
1358         .fifo_lvl_mask  = { 0x1ff },
1359         .rx_lvl_offset  = 15,
1360         .tx_st_done     = 25,
1361         .high_speed     = true,
1362         .clk_from_cmu   = true,
1363         .quirks         = S3C64XX_SPI_QUIRK_POLL,
1364 };
1365
1366 static struct s3c64xx_spi_port_config exynos7_spi_port_config = {
1367         .fifo_lvl_mask  = { 0x1ff, 0x7F, 0x7F, 0x7F, 0x7F, 0x1ff},
1368         .rx_lvl_offset  = 15,
1369         .tx_st_done     = 25,
1370         .high_speed     = true,
1371         .clk_from_cmu   = true,
1372         .quirks         = S3C64XX_SPI_QUIRK_CS_AUTO,
1373 };
1374
1375 static struct s3c64xx_spi_port_config exynos5433_spi_port_config = {
1376         .fifo_lvl_mask  = { 0x1ff, 0x7f, 0x7f, 0x7f, 0x7f, 0x1ff},
1377         .rx_lvl_offset  = 15,
1378         .tx_st_done     = 25,
1379         .high_speed     = true,
1380         .clk_from_cmu   = true,
1381         .clk_ioclk      = true,
1382         .quirks         = S3C64XX_SPI_QUIRK_CS_AUTO,
1383 };
1384
1385 static const struct platform_device_id s3c64xx_spi_driver_ids[] = {
1386         {
1387                 .name           = "s3c2443-spi",
1388                 .driver_data    = (kernel_ulong_t)&s3c2443_spi_port_config,
1389         }, {
1390                 .name           = "s3c6410-spi",
1391                 .driver_data    = (kernel_ulong_t)&s3c6410_spi_port_config,
1392         },
1393         { },
1394 };
1395
1396 static const struct of_device_id s3c64xx_spi_dt_match[] = {
1397         { .compatible = "samsung,s3c2443-spi",
1398                         .data = (void *)&s3c2443_spi_port_config,
1399         },
1400         { .compatible = "samsung,s3c6410-spi",
1401                         .data = (void *)&s3c6410_spi_port_config,
1402         },
1403         { .compatible = "samsung,s5pv210-spi",
1404                         .data = (void *)&s5pv210_spi_port_config,
1405         },
1406         { .compatible = "samsung,exynos4210-spi",
1407                         .data = (void *)&exynos4_spi_port_config,
1408         },
1409         { .compatible = "samsung,exynos5440-spi",
1410                         .data = (void *)&exynos5440_spi_port_config,
1411         },
1412         { .compatible = "samsung,exynos7-spi",
1413                         .data = (void *)&exynos7_spi_port_config,
1414         },
1415         { .compatible = "samsung,exynos5433-spi",
1416                         .data = (void *)&exynos5433_spi_port_config,
1417         },
1418         { },
1419 };
1420 MODULE_DEVICE_TABLE(of, s3c64xx_spi_dt_match);
1421
1422 static struct platform_driver s3c64xx_spi_driver = {
1423         .driver = {
1424                 .name   = "s3c64xx-spi",
1425                 .pm = &s3c64xx_spi_pm,
1426                 .of_match_table = of_match_ptr(s3c64xx_spi_dt_match),
1427         },
1428         .probe = s3c64xx_spi_probe,
1429         .remove = s3c64xx_spi_remove,
1430         .id_table = s3c64xx_spi_driver_ids,
1431 };
1432 MODULE_ALIAS("platform:s3c64xx-spi");
1433
1434 module_platform_driver(s3c64xx_spi_driver);
1435
1436 MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>");
1437 MODULE_DESCRIPTION("S3C64XX SPI Controller Driver");
1438 MODULE_LICENSE("GPL");