drivers/spi/omap3_spi.c

   1 /*
   2  * Copyright (C) 2016 Jagan Teki <jteki@openedev.com>
   3  *                    Christophe Ricard <christophe.ricard@gmail.com>
   4  *
   5  * Copyright (C) 2010 Dirk Behme <dirk.behme@googlemail.com>
   6  *
   7  * Driver for McSPI controller on OMAP3. Based on davinci_spi.c
   8  * Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
   9  *
  10  * Copyright (C) 2007 Atmel Corporation
  11  *
  12  * Parts taken from linux/drivers/spi/omap2_mcspi.c
  13  * Copyright (C) 2005, 2006 Nokia Corporation
  14  *
  15  * Modified by Ruslan Araslanov <ruslan.araslanov@vitecmm.com>
  16  *
  17  * SPDX-License-Identifier:     GPL-2.0+
  18  */
  19
  20 #include <common.h>
  21 #include <dm.h>
  22 #include <spi.h>
  23 #include <malloc.h>
  24 #include <asm/io.h>
  25
  26 DECLARE_GLOBAL_DATA_PTR;
  27
  28 #if defined(CONFIG_AM33XX) || defined(CONFIG_AM43XX)
  29 #define OMAP3_MCSPI1_BASE       0x48030100
  30 #define OMAP3_MCSPI2_BASE       0x481A0100
  31 #else
  32 #define OMAP3_MCSPI1_BASE       0x48098000
  33 #define OMAP3_MCSPI2_BASE       0x4809A000
  34 #define OMAP3_MCSPI3_BASE       0x480B8000
  35 #define OMAP3_MCSPI4_BASE       0x480BA000
  36 #endif
  37
  38 #define OMAP4_MCSPI_REG_OFFSET  0x100
  39
  40 struct omap2_mcspi_platform_config {
  41         unsigned int regs_offset;
  42 };
  43
  44 /* per-register bitmasks */
  45 #define OMAP3_MCSPI_SYSCONFIG_SMARTIDLE (2 << 3)
  46 #define OMAP3_MCSPI_SYSCONFIG_ENAWAKEUP BIT(2)
  47 #define OMAP3_MCSPI_SYSCONFIG_AUTOIDLE  BIT(0)
  48 #define OMAP3_MCSPI_SYSCONFIG_SOFTRESET BIT(1)
  49
  50 #define OMAP3_MCSPI_SYSSTATUS_RESETDONE BIT(0)
  51
  52 #define OMAP3_MCSPI_MODULCTRL_SINGLE    BIT(0)
  53 #define OMAP3_MCSPI_MODULCTRL_MS        BIT(2)
  54 #define OMAP3_MCSPI_MODULCTRL_STEST     BIT(3)
  55
  56 #define OMAP3_MCSPI_CHCONF_PHA          BIT(0)
  57 #define OMAP3_MCSPI_CHCONF_POL          BIT(1)
  58 #define OMAP3_MCSPI_CHCONF_CLKD_MASK    GENMASK(5, 2)
  59 #define OMAP3_MCSPI_CHCONF_EPOL         BIT(6)
  60 #define OMAP3_MCSPI_CHCONF_WL_MASK      GENMASK(11, 7)
  61 #define OMAP3_MCSPI_CHCONF_TRM_RX_ONLY  BIT(12)
  62 #define OMAP3_MCSPI_CHCONF_TRM_TX_ONLY  BIT(13)
  63 #define OMAP3_MCSPI_CHCONF_TRM_MASK     GENMASK(13, 12)
  64 #define OMAP3_MCSPI_CHCONF_DMAW         BIT(14)
  65 #define OMAP3_MCSPI_CHCONF_DMAR         BIT(15)
  66 #define OMAP3_MCSPI_CHCONF_DPE0         BIT(16)
  67 #define OMAP3_MCSPI_CHCONF_DPE1         BIT(17)
  68 #define OMAP3_MCSPI_CHCONF_IS           BIT(18)
  69 #define OMAP3_MCSPI_CHCONF_TURBO        BIT(19)
  70 #define OMAP3_MCSPI_CHCONF_FORCE        BIT(20)
  71
  72 #define OMAP3_MCSPI_CHSTAT_RXS          BIT(0)
  73 #define OMAP3_MCSPI_CHSTAT_TXS          BIT(1)
  74 #define OMAP3_MCSPI_CHSTAT_EOT          BIT(2)
  75
  76 #define OMAP3_MCSPI_CHCTRL_EN           BIT(0)
  77 #define OMAP3_MCSPI_CHCTRL_DIS          (0 << 0)
  78
  79 #define OMAP3_MCSPI_WAKEUPENABLE_WKEN   BIT(0)
  80 #define MCSPI_PINDIR_D0_IN_D1_OUT       0
  81 #define MCSPI_PINDIR_D0_OUT_D1_IN       1
  82
  83 #define OMAP3_MCSPI_MAX_FREQ            48000000
  84 #define SPI_WAIT_TIMEOUT                10
  85
  86 /* OMAP3 McSPI registers */
  87 struct mcspi_channel {
  88         unsigned int chconf;            /* 0x2C, 0x40, 0x54, 0x68 */
  89         unsigned int chstat;            /* 0x30, 0x44, 0x58, 0x6C */
  90         unsigned int chctrl;            /* 0x34, 0x48, 0x5C, 0x70 */
  91         unsigned int tx;                /* 0x38, 0x4C, 0x60, 0x74 */
  92         unsigned int rx;                /* 0x3C, 0x50, 0x64, 0x78 */
  93 };
  94
  95 struct mcspi {
  96         unsigned char res1[0x10];
  97         unsigned int sysconfig;         /* 0x10 */
  98         unsigned int sysstatus;         /* 0x14 */
  99         unsigned int irqstatus;         /* 0x18 */
 100         unsigned int irqenable;         /* 0x1C */
 101         unsigned int wakeupenable;      /* 0x20 */
 102         unsigned int syst;              /* 0x24 */
 103         unsigned int modulctrl;         /* 0x28 */
 104         struct mcspi_channel channel[4];
 105         /* channel0: 0x2C - 0x3C, bus 0 & 1 & 2 & 3 */
 106         /* channel1: 0x40 - 0x50, bus 0 & 1 */
 107         /* channel2: 0x54 - 0x64, bus 0 & 1 */
 108         /* channel3: 0x68 - 0x78, bus 0 */
 109 };
 110
 111 struct omap3_spi_priv {
 112 #ifndef CONFIG_DM_SPI
 113         struct spi_slave slave;
 114 #endif
 115         struct mcspi *regs;
 116         unsigned int cs;
 117         unsigned int freq;
 118         unsigned int mode;
 119         unsigned int wordlen;
 120         unsigned int pin_dir:1;
 121 };
 122
 123 static void omap3_spi_write_chconf(struct omap3_spi_priv *priv, int val)
 124 {
 125         writel(val, &priv->regs->channel[priv->cs].chconf);
 126         /* Flash post writes to make immediate effect */
 127         readl(&priv->regs->channel[priv->cs].chconf);
 128 }
 129
 130 static void omap3_spi_set_enable(struct omap3_spi_priv *priv, int enable)
 131 {
 132         writel(enable, &priv->regs->channel[priv->cs].chctrl);
 133         /* Flash post writes to make immediate effect */
 134         readl(&priv->regs->channel[priv->cs].chctrl);
 135 }
 136
 137 static int omap3_spi_write(struct omap3_spi_priv *priv, unsigned int len,
 138                            const void *txp, unsigned long flags)
 139 {
 140         ulong start;
 141         int i, chconf;
 142
 143         chconf = readl(&priv->regs->channel[priv->cs].chconf);
 144
 145         /* Enable the channel */
 146         omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_EN);
 147
 148         chconf &= ~(OMAP3_MCSPI_CHCONF_TRM_MASK | OMAP3_MCSPI_CHCONF_WL_MASK);
 149         chconf |= (priv->wordlen - 1) << 7;
 150         chconf |= OMAP3_MCSPI_CHCONF_TRM_TX_ONLY;
 151         chconf |= OMAP3_MCSPI_CHCONF_FORCE;
 152         omap3_spi_write_chconf(priv, chconf);
 153
 154         for (i = 0; i < len; i++) {
 155                 /* wait till TX register is empty (TXS == 1) */
 156                 start = get_timer(0);
 157                 while (!(readl(&priv->regs->channel[priv->cs].chstat) &
 158                          OMAP3_MCSPI_CHSTAT_TXS)) {
 159                         if (get_timer(start) > SPI_WAIT_TIMEOUT) {
 160                                 printf("SPI TXS timed out, status=0x%08x\n",
 161                                         readl(&priv->regs->channel[priv->cs].chstat));
 162                                 return -1;
 163                         }
 164                 }
 165                 /* Write the data */
 166                 unsigned int *tx = &priv->regs->channel[priv->cs].tx;
 167                 if (priv->wordlen > 16)
 168                         writel(((u32 *)txp)[i], tx);
 169                 else if (priv->wordlen > 8)
 170                         writel(((u16 *)txp)[i], tx);
 171                 else
 172                         writel(((u8 *)txp)[i], tx);
 173         }
 174
 175         /* wait to finish of transfer */
 176         while ((readl(&priv->regs->channel[priv->cs].chstat) &
 177                         (OMAP3_MCSPI_CHSTAT_EOT | OMAP3_MCSPI_CHSTAT_TXS)) !=
 178                         (OMAP3_MCSPI_CHSTAT_EOT | OMAP3_MCSPI_CHSTAT_TXS))
 179                 ;
 180
 181         /* Disable the channel otherwise the next immediate RX will get affected */
 182         omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_DIS);
 183
 184         if (flags & SPI_XFER_END) {
 185
 186                 chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
 187                 omap3_spi_write_chconf(priv, chconf);
 188         }
 189         return 0;
 190 }
 191
 192 static int omap3_spi_read(struct omap3_spi_priv *priv, unsigned int len,
 193                           void *rxp, unsigned long flags)
 194 {
 195         int i, chconf;
 196         ulong start;
 197
 198         chconf = readl(&priv->regs->channel[priv->cs].chconf);
 199
 200         /* Enable the channel */
 201         omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_EN);
 202
 203         chconf &= ~(OMAP3_MCSPI_CHCONF_TRM_MASK | OMAP3_MCSPI_CHCONF_WL_MASK);
 204         chconf |= (priv->wordlen - 1) << 7;
 205         chconf |= OMAP3_MCSPI_CHCONF_TRM_RX_ONLY;
 206         chconf |= OMAP3_MCSPI_CHCONF_FORCE;
 207         omap3_spi_write_chconf(priv, chconf);
 208
 209         writel(0, &priv->regs->channel[priv->cs].tx);
 210
 211         for (i = 0; i < len; i++) {
 212                 start = get_timer(0);
 213                 /* Wait till RX register contains data (RXS == 1) */
 214                 while (!(readl(&priv->regs->channel[priv->cs].chstat) &
 215                          OMAP3_MCSPI_CHSTAT_RXS)) {
 216                         if (get_timer(start) > SPI_WAIT_TIMEOUT) {
 217                                 printf("SPI RXS timed out, status=0x%08x\n",
 218                                         readl(&priv->regs->channel[priv->cs].chstat));
 219                                 return -1;
 220                         }
 221                 }
 222
 223                 /* Disable the channel to prevent furher receiving */
 224                 if (i == (len - 1))
 225                         omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_DIS);
 226
 227                 /* Read the data */
 228                 unsigned int *rx = &priv->regs->channel[priv->cs].rx;
 229                 if (priv->wordlen > 16)
 230                         ((u32 *)rxp)[i] = readl(rx);
 231                 else if (priv->wordlen > 8)
 232                         ((u16 *)rxp)[i] = (u16)readl(rx);
 233                 else
 234                         ((u8 *)rxp)[i] = (u8)readl(rx);
 235         }
 236
 237         if (flags & SPI_XFER_END) {
 238                 chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
 239                 omap3_spi_write_chconf(priv, chconf);
 240         }
 241
 242         return 0;
 243 }
 244
 245 /*McSPI Transmit Receive Mode*/
 246 static int omap3_spi_txrx(struct omap3_spi_priv *priv, unsigned int len,
 247                           const void *txp, void *rxp, unsigned long flags)
 248 {
 249         ulong start;
 250         int chconf, i = 0;
 251
 252         chconf = readl(&priv->regs->channel[priv->cs].chconf);
 253
 254         /*Enable SPI channel*/
 255         omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_EN);
 256
 257         /*set TRANSMIT-RECEIVE Mode*/
 258         chconf &= ~(OMAP3_MCSPI_CHCONF_TRM_MASK | OMAP3_MCSPI_CHCONF_WL_MASK);
 259         chconf |= (priv->wordlen - 1) << 7;
 260         chconf |= OMAP3_MCSPI_CHCONF_FORCE;
 261         omap3_spi_write_chconf(priv, chconf);
 262
 263         /*Shift in and out 1 byte at time*/
 264         for (i=0; i < len; i++){
 265                 /* Write: wait for TX empty (TXS == 1)*/
 266                 start = get_timer(0);
 267                 while (!(readl(&priv->regs->channel[priv->cs].chstat) &
 268                          OMAP3_MCSPI_CHSTAT_TXS)) {
 269                         if (get_timer(start) > SPI_WAIT_TIMEOUT) {
 270                                 printf("SPI TXS timed out, status=0x%08x\n",
 271                                         readl(&priv->regs->channel[priv->cs].chstat));
 272                                 return -1;
 273                         }
 274                 }
 275                 /* Write the data */
 276                 unsigned int *tx = &priv->regs->channel[priv->cs].tx;
 277                 if (priv->wordlen > 16)
 278                         writel(((u32 *)txp)[i], tx);
 279                 else if (priv->wordlen > 8)
 280                         writel(((u16 *)txp)[i], tx);
 281                 else
 282                         writel(((u8 *)txp)[i], tx);
 283
 284                 /*Read: wait for RX containing data (RXS == 1)*/
 285                 start = get_timer(0);
 286                 while (!(readl(&priv->regs->channel[priv->cs].chstat) &
 287                          OMAP3_MCSPI_CHSTAT_RXS)) {
 288                         if (get_timer(start) > SPI_WAIT_TIMEOUT) {
 289                                 printf("SPI RXS timed out, status=0x%08x\n",
 290                                         readl(&priv->regs->channel[priv->cs].chstat));
 291                                 return -1;
 292                         }
 293                 }
 294                 /* Read the data */
 295                 unsigned int *rx = &priv->regs->channel[priv->cs].rx;
 296                 if (priv->wordlen > 16)
 297                         ((u32 *)rxp)[i] = readl(rx);
 298                 else if (priv->wordlen > 8)
 299                         ((u16 *)rxp)[i] = (u16)readl(rx);
 300                 else
 301                         ((u8 *)rxp)[i] = (u8)readl(rx);
 302         }
 303         /* Disable the channel */
 304         omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_DIS);
 305
 306         /*if transfer must be terminated disable the channel*/
 307         if (flags & SPI_XFER_END) {
 308                 chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
 309                 omap3_spi_write_chconf(priv, chconf);
 310         }
 311
 312         return 0;
 313 }
 314
 315 static int _spi_xfer(struct omap3_spi_priv *priv, unsigned int bitlen,
 316                      const void *dout, void *din, unsigned long flags)
 317 {
 318         unsigned int    len;
 319         int ret = -1;
 320
 321         if (priv->wordlen < 4 || priv->wordlen > 32) {
 322                 printf("omap3_spi: invalid wordlen %d\n", priv->wordlen);
 323                 return -1;
 324         }
 325
 326         if (bitlen % priv->wordlen)
 327                 return -1;
 328
 329         len = bitlen / priv->wordlen;
 330
 331         if (bitlen == 0) {       /* only change CS */
 332                 int chconf = readl(&priv->regs->channel[priv->cs].chconf);
 333
 334                 if (flags & SPI_XFER_BEGIN) {
 335                         omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_EN);
 336                         chconf |= OMAP3_MCSPI_CHCONF_FORCE;
 337                         omap3_spi_write_chconf(priv, chconf);
 338                 }
 339                 if (flags & SPI_XFER_END) {
 340                         chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
 341                         omap3_spi_write_chconf(priv, chconf);
 342                         omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_DIS);
 343                 }
 344                 ret = 0;
 345         } else {
 346                 if (dout != NULL && din != NULL)
 347                         ret = omap3_spi_txrx(priv, len, dout, din, flags);
 348                 else if (dout != NULL)
 349                         ret = omap3_spi_write(priv, len, dout, flags);
 350                 else if (din != NULL)
 351                         ret = omap3_spi_read(priv, len, din, flags);
 352         }
 353         return ret;
 354 }
 355
 356 static void _omap3_spi_set_speed(struct omap3_spi_priv *priv)
 357 {
 358         uint32_t confr, div = 0;
 359
 360         confr = readl(&priv->regs->channel[priv->cs].chconf);
 361
 362         /* Calculate clock divisor. Valid range: 0x0 - 0xC ( /1 - /4096 ) */
 363         if (priv->freq) {
 364                 while (div <= 0xC && (OMAP3_MCSPI_MAX_FREQ / (1 << div))
 365                                         > priv->freq)
 366                         div++;
 367         } else {
 368                  div = 0xC;
 369         }
 370
 371         /* set clock divisor */
 372         confr &= ~OMAP3_MCSPI_CHCONF_CLKD_MASK;
 373         confr |= div << 2;
 374
 375         omap3_spi_write_chconf(priv, confr);
 376 }
 377
 378 static void _omap3_spi_set_mode(struct omap3_spi_priv *priv)
 379 {
 380         uint32_t confr;
 381
 382         confr = readl(&priv->regs->channel[priv->cs].chconf);
 383
 384         /* standard 4-wire master mode:  SCK, MOSI/out, MISO/in, nCS
 385          * REVISIT: this controller could support SPI_3WIRE mode.
 386          */
 387         if (priv->pin_dir == MCSPI_PINDIR_D0_IN_D1_OUT) {
 388                 confr &= ~(OMAP3_MCSPI_CHCONF_IS|OMAP3_MCSPI_CHCONF_DPE1);
 389                 confr |= OMAP3_MCSPI_CHCONF_DPE0;
 390         } else {
 391                 confr &= ~OMAP3_MCSPI_CHCONF_DPE0;
 392                 confr |= OMAP3_MCSPI_CHCONF_IS|OMAP3_MCSPI_CHCONF_DPE1;
 393         }
 394
 395         /* set SPI mode 0..3 */
 396         confr &= ~(OMAP3_MCSPI_CHCONF_POL | OMAP3_MCSPI_CHCONF_PHA);
 397         if (priv->mode & SPI_CPHA)
 398                 confr |= OMAP3_MCSPI_CHCONF_PHA;
 399         if (priv->mode & SPI_CPOL)
 400                 confr |= OMAP3_MCSPI_CHCONF_POL;
 401
 402         /* set chipselect polarity; manage with FORCE */
 403         if (!(priv->mode & SPI_CS_HIGH))
 404                 confr |= OMAP3_MCSPI_CHCONF_EPOL; /* active-low; normal */
 405         else
 406                 confr &= ~OMAP3_MCSPI_CHCONF_EPOL;
 407
 408         /* Transmit & receive mode */
 409         confr &= ~OMAP3_MCSPI_CHCONF_TRM_MASK;
 410
 411         omap3_spi_write_chconf(priv, confr);
 412 }
 413
 414 static void _omap3_spi_set_wordlen(struct omap3_spi_priv *priv)
 415 {
 416         unsigned int confr;
 417
 418         /* McSPI individual channel configuration */
 419         confr = readl(&priv->regs->channel[priv->wordlen].chconf);
 420
 421         /* wordlength */
 422         confr &= ~OMAP3_MCSPI_CHCONF_WL_MASK;
 423         confr |= (priv->wordlen - 1) << 7;
 424
 425         omap3_spi_write_chconf(priv, confr);
 426 }
 427
 428 static void spi_reset(struct mcspi *regs)
 429 {
 430         unsigned int tmp;
 431
 432         writel(OMAP3_MCSPI_SYSCONFIG_SOFTRESET, &regs->sysconfig);
 433         do {
 434                 tmp = readl(&regs->sysstatus);
 435         } while (!(tmp & OMAP3_MCSPI_SYSSTATUS_RESETDONE));
 436
 437         writel(OMAP3_MCSPI_SYSCONFIG_AUTOIDLE |
 438                OMAP3_MCSPI_SYSCONFIG_ENAWAKEUP |
 439                OMAP3_MCSPI_SYSCONFIG_SMARTIDLE, &regs->sysconfig);
 440
 441         writel(OMAP3_MCSPI_WAKEUPENABLE_WKEN, &regs->wakeupenable);
 442 }
 443
 444 static void _omap3_spi_claim_bus(struct omap3_spi_priv *priv)
 445 {
 446         unsigned int conf;
 447
 448         spi_reset(priv->regs);
 449
 450         /*
 451          * setup when switching from (reset default) slave mode
 452          * to single-channel master mode
 453          */
 454         conf = readl(&priv->regs->modulctrl);
 455         conf &= ~(OMAP3_MCSPI_MODULCTRL_STEST | OMAP3_MCSPI_MODULCTRL_MS);
 456         conf |= OMAP3_MCSPI_MODULCTRL_SINGLE;
 457
 458         writel(conf, &priv->regs->modulctrl);
 459
 460         _omap3_spi_set_mode(priv);
 461         _omap3_spi_set_speed(priv);
 462 }
 463
 464 #ifndef CONFIG_DM_SPI
 465
 466 static inline struct omap3_spi_priv *to_omap3_spi(struct spi_slave *slave)
 467 {
 468         return container_of(slave, struct omap3_spi_priv, slave);
 469 }
 470
 471 void spi_init(void)
 472 {
 473         /* do nothing */
 474 }
 475
 476 void spi_free_slave(struct spi_slave *slave)
 477 {
 478         struct omap3_spi_priv *priv = to_omap3_spi(slave);
 479
 480         free(priv);
 481 }
 482
 483 int spi_claim_bus(struct spi_slave *slave)
 484 {
 485         struct omap3_spi_priv *priv = to_omap3_spi(slave);
 486
 487         _omap3_spi_claim_bus(priv);
 488         _omap3_spi_set_wordlen(priv);
 489         _omap3_spi_set_mode(priv);
 490         _omap3_spi_set_speed(priv);
 491
 492         return 0;
 493 }
 494
 495 void spi_release_bus(struct spi_slave *slave)
 496 {
 497         struct omap3_spi_priv *priv = to_omap3_spi(slave);
 498
 499         /* Reset the SPI hardware */
 500         spi_reset(priv->regs);
 501 }
 502
 503 struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
 504                                      unsigned int max_hz, unsigned int mode)
 505 {
 506         struct omap3_spi_priv *priv;
 507         struct mcspi *regs;
 508
 509         /*
 510          * OMAP3 McSPI (MultiChannel SPI) has 4 busses (modules)
 511          * with different number of chip selects (CS, channels):
 512          * McSPI1 has 4 CS (bus 0, cs 0 - 3)
 513          * McSPI2 has 2 CS (bus 1, cs 0 - 1)
 514          * McSPI3 has 2 CS (bus 2, cs 0 - 1)
 515          * McSPI4 has 1 CS (bus 3, cs 0)
 516          */
 517
 518         switch (bus) {
 519         case 0:
 520                  regs = (struct mcspi *)OMAP3_MCSPI1_BASE;
 521                  break;
 522 #ifdef OMAP3_MCSPI2_BASE
 523         case 1:
 524                  regs = (struct mcspi *)OMAP3_MCSPI2_BASE;
 525                  break;
 526 #endif
 527 #ifdef OMAP3_MCSPI3_BASE
 528         case 2:
 529                  regs = (struct mcspi *)OMAP3_MCSPI3_BASE;
 530                  break;
 531 #endif
 532 #ifdef OMAP3_MCSPI4_BASE
 533         case 3:
 534                  regs = (struct mcspi *)OMAP3_MCSPI4_BASE;
 535                  break;
 536 #endif
 537         default:
 538                  printf("SPI error: unsupported bus %i.  Supported busses 0 - 3\n", bus);
 539                  return NULL;
 540         }
 541
 542         if (((bus == 0) && (cs > 3)) ||
 543             ((bus == 1) && (cs > 1)) ||
 544             ((bus == 2) && (cs > 1)) ||
 545             ((bus == 3) && (cs > 0))) {
 546                 printf("SPI error: unsupported chip select %i on bus %i\n", cs, bus);
 547                 return NULL;
 548         }
 549
 550         if (max_hz > OMAP3_MCSPI_MAX_FREQ) {
 551                 printf("SPI error: unsupported frequency %i Hz. Max frequency is 48 Mhz\n", max_hz);
 552                 return NULL;
 553         }
 554
 555         if (mode > SPI_MODE_3) {
 556                 printf("SPI error: unsupported SPI mode %i\n", mode);
 557                 return NULL;
 558         }
 559
 560         priv = spi_alloc_slave(struct omap3_spi_priv, bus, cs);
 561         if (!priv) {
 562                 printf("SPI error: malloc of SPI structure failed\n");
 563                 return NULL;
 564         }
 565
 566         priv->regs = regs;
 567         priv->cs = cs;
 568         priv->freq = max_hz;
 569         priv->mode = mode;
 570         priv->wordlen = priv->slave.wordlen;
 571 #ifdef CONFIG_OMAP3_SPI_D0_D1_SWAPPED
 572         priv->pin_dir = MCSPI_PINDIR_D0_OUT_D1_IN;
 573 #endif
 574
 575         return &priv->slave;
 576 }
 577
 578 int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
 579              const void *dout, void *din, unsigned long flags)
 580 {
 581         struct omap3_spi_priv *priv = to_omap3_spi(slave);
 582
 583         return _spi_xfer(priv, bitlen, dout, din, flags);
 584 }
 585
 586 #else
 587
 588 static int omap3_spi_claim_bus(struct udevice *dev)
 589 {
 590         struct udevice *bus = dev->parent;
 591         struct omap3_spi_priv *priv = dev_get_priv(bus);
 592         struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
 593
 594         priv->cs = slave_plat->cs;
 595         priv->mode = slave_plat->mode;
 596         priv->freq = slave_plat->max_hz;
 597         _omap3_spi_claim_bus(priv);
 598
 599         return 0;
 600 }
 601
 602 static int omap3_spi_release_bus(struct udevice *dev)
 603 {
 604         struct udevice *bus = dev->parent;
 605         struct omap3_spi_priv *priv = dev_get_priv(bus);
 606
 607         /* Reset the SPI hardware */
 608         spi_reset(priv->regs);
 609
 610         return 0;
 611 }
 612
 613 static int omap3_spi_set_wordlen(struct udevice *dev, unsigned int wordlen)
 614 {
 615         struct udevice *bus = dev->parent;
 616         struct omap3_spi_priv *priv = dev_get_priv(bus);
 617         struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
 618
 619         priv->cs = slave_plat->cs;
 620         priv->wordlen = wordlen;
 621         _omap3_spi_set_wordlen(priv);
 622
 623         return 0;
 624 }
 625
 626 static int omap3_spi_probe(struct udevice *dev)
 627 {
 628         struct omap3_spi_priv *priv = dev_get_priv(dev);
 629         const void *blob = gd->fdt_blob;
 630         int node = dev_of_offset(dev);
 631
 632         struct omap2_mcspi_platform_config* data =
 633                 (struct omap2_mcspi_platform_config*)dev_get_driver_data(dev);
 634
 635         priv->regs = (struct mcspi *)(dev_get_addr(dev) + data->regs_offset);
 636         priv->pin_dir = fdtdec_get_uint(blob, node, "ti,pindir-d0-out-d1-in",
 637                                             MCSPI_PINDIR_D0_IN_D1_OUT);
 638         priv->wordlen = SPI_DEFAULT_WORDLEN;
 639         return 0;
 640 }
 641
 642 static int omap3_spi_xfer(struct udevice *dev, unsigned int bitlen,
 643                             const void *dout, void *din, unsigned long flags)
 644 {
 645         struct udevice *bus = dev->parent;
 646         struct omap3_spi_priv *priv = dev_get_priv(bus);
 647
 648         return _spi_xfer(priv, bitlen, dout, din, flags);
 649 }
 650
 651 static int omap3_spi_set_speed(struct udevice *bus, unsigned int speed)
 652 {
 653         return 0;
 654 }
 655
 656 static int omap3_spi_set_mode(struct udevice *bus, uint mode)
 657 {
 658         return 0;
 659 }
 660
 661 static const struct dm_spi_ops omap3_spi_ops = {
 662         .claim_bus      = omap3_spi_claim_bus,
 663         .release_bus    = omap3_spi_release_bus,
 664         .set_wordlen    = omap3_spi_set_wordlen,
 665         .xfer       = omap3_spi_xfer,
 666         .set_speed      = omap3_spi_set_speed,
 667         .set_mode       = omap3_spi_set_mode,
 668         /*
 669          * cs_info is not needed, since we require all chip selects to be
 670          * in the device tree explicitly
 671          */
 672 };
 673
 674 static struct omap2_mcspi_platform_config omap2_pdata = {
 675         .regs_offset = 0,
 676 };
 677
 678 static struct omap2_mcspi_platform_config omap4_pdata = {
 679         .regs_offset = OMAP4_MCSPI_REG_OFFSET,
 680 };
 681
 682 static const struct udevice_id omap3_spi_ids[] = {
 683         { .compatible = "ti,omap2-mcspi", .data = (ulong)&omap2_pdata },
 684         { .compatible = "ti,omap4-mcspi", .data = (ulong)&omap4_pdata },
 685         { }
 686 };
 687
 688 U_BOOT_DRIVER(omap3_spi) = {
 689         .name   = "omap3_spi",
 690         .id     = UCLASS_SPI,
 691         .of_match = omap3_spi_ids,
 692         .probe = omap3_spi_probe,
 693         .ops    = &omap3_spi_ops,
 694         .priv_auto_alloc_size = sizeof(struct omap3_spi_priv),
 695 };
 696 #endif