drivers/spi/omap3_spi.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2016 Jagan Teki <jteki@openedev.com>
   4  *                    Christophe Ricard <christophe.ricard@gmail.com>
   5  *
   6  * Copyright (C) 2010 Dirk Behme <dirk.behme@googlemail.com>
   7  *
   8  * Driver for McSPI controller on OMAP3. Based on davinci_spi.c
   9  * Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
  10  *
  11  * Copyright (C) 2007 Atmel Corporation
  12  *
  13  * Parts taken from linux/drivers/spi/omap2_mcspi.c
  14  * Copyright (C) 2005, 2006 Nokia Corporation
  15  *
  16  * Modified by Ruslan Araslanov <ruslan.araslanov@vitecmm.com>
  17  */
  18
  19 #include <common.h>
  20 #include <dm.h>
  21 #include <spi.h>
  22 #include <malloc.h>
  23 #include <asm/io.h>
  24
  25 DECLARE_GLOBAL_DATA_PTR;
  26
  27 #if defined(CONFIG_AM33XX) || defined(CONFIG_AM43XX)
  28 #define OMAP3_MCSPI1_BASE       0x48030100
  29 #define OMAP3_MCSPI2_BASE       0x481A0100
  30 #else
  31 #define OMAP3_MCSPI1_BASE       0x48098000
  32 #define OMAP3_MCSPI2_BASE       0x4809A000
  33 #define OMAP3_MCSPI3_BASE       0x480B8000
  34 #define OMAP3_MCSPI4_BASE       0x480BA000
  35 #endif
  36
  37 #define OMAP4_MCSPI_REG_OFFSET  0x100
  38
  39 struct omap2_mcspi_platform_config {
  40         unsigned int regs_offset;
  41 };
  42
  43 /* per-register bitmasks */
  44 #define OMAP3_MCSPI_SYSCONFIG_SMARTIDLE (2 << 3)
  45 #define OMAP3_MCSPI_SYSCONFIG_ENAWAKEUP BIT(2)
  46 #define OMAP3_MCSPI_SYSCONFIG_AUTOIDLE  BIT(0)
  47 #define OMAP3_MCSPI_SYSCONFIG_SOFTRESET BIT(1)
  48
  49 #define OMAP3_MCSPI_SYSSTATUS_RESETDONE BIT(0)
  50
  51 #define OMAP3_MCSPI_MODULCTRL_SINGLE    BIT(0)
  52 #define OMAP3_MCSPI_MODULCTRL_MS        BIT(2)
  53 #define OMAP3_MCSPI_MODULCTRL_STEST     BIT(3)
  54
  55 #define OMAP3_MCSPI_CHCONF_PHA          BIT(0)
  56 #define OMAP3_MCSPI_CHCONF_POL          BIT(1)
  57 #define OMAP3_MCSPI_CHCONF_CLKD_MASK    GENMASK(5, 2)
  58 #define OMAP3_MCSPI_CHCONF_EPOL         BIT(6)
  59 #define OMAP3_MCSPI_CHCONF_WL_MASK      GENMASK(11, 7)
  60 #define OMAP3_MCSPI_CHCONF_TRM_RX_ONLY  BIT(12)
  61 #define OMAP3_MCSPI_CHCONF_TRM_TX_ONLY  BIT(13)
  62 #define OMAP3_MCSPI_CHCONF_TRM_MASK     GENMASK(13, 12)
  63 #define OMAP3_MCSPI_CHCONF_DMAW         BIT(14)
  64 #define OMAP3_MCSPI_CHCONF_DMAR         BIT(15)
  65 #define OMAP3_MCSPI_CHCONF_DPE0         BIT(16)
  66 #define OMAP3_MCSPI_CHCONF_DPE1         BIT(17)
  67 #define OMAP3_MCSPI_CHCONF_IS           BIT(18)
  68 #define OMAP3_MCSPI_CHCONF_TURBO        BIT(19)
  69 #define OMAP3_MCSPI_CHCONF_FORCE        BIT(20)
  70
  71 #define OMAP3_MCSPI_CHSTAT_RXS          BIT(0)
  72 #define OMAP3_MCSPI_CHSTAT_TXS          BIT(1)
  73 #define OMAP3_MCSPI_CHSTAT_EOT          BIT(2)
  74
  75 #define OMAP3_MCSPI_CHCTRL_EN           BIT(0)
  76 #define OMAP3_MCSPI_CHCTRL_DIS          (0 << 0)
  77
  78 #define OMAP3_MCSPI_WAKEUPENABLE_WKEN   BIT(0)
  79 #define MCSPI_PINDIR_D0_IN_D1_OUT       0
  80 #define MCSPI_PINDIR_D0_OUT_D1_IN       1
  81
  82 #define OMAP3_MCSPI_MAX_FREQ            48000000
  83 #define SPI_WAIT_TIMEOUT                10
  84
  85 /* OMAP3 McSPI registers */
  86 struct mcspi_channel {
  87         unsigned int chconf;            /* 0x2C, 0x40, 0x54, 0x68 */
  88         unsigned int chstat;            /* 0x30, 0x44, 0x58, 0x6C */
  89         unsigned int chctrl;            /* 0x34, 0x48, 0x5C, 0x70 */
  90         unsigned int tx;                /* 0x38, 0x4C, 0x60, 0x74 */
  91         unsigned int rx;                /* 0x3C, 0x50, 0x64, 0x78 */
  92 };
  93
  94 struct mcspi {
  95         unsigned char res1[0x10];
  96         unsigned int sysconfig;         /* 0x10 */
  97         unsigned int sysstatus;         /* 0x14 */
  98         unsigned int irqstatus;         /* 0x18 */
  99         unsigned int irqenable;         /* 0x1C */
 100         unsigned int wakeupenable;      /* 0x20 */
 101         unsigned int syst;              /* 0x24 */
 102         unsigned int modulctrl;         /* 0x28 */
 103         struct mcspi_channel channel[4];
 104         /* channel0: 0x2C - 0x3C, bus 0 & 1 & 2 & 3 */
 105         /* channel1: 0x40 - 0x50, bus 0 & 1 */
 106         /* channel2: 0x54 - 0x64, bus 0 & 1 */
 107         /* channel3: 0x68 - 0x78, bus 0 */
 108 };
 109
 110 struct omap3_spi_priv {
 111 #ifndef CONFIG_DM_SPI
 112         struct spi_slave slave;
 113 #endif
 114         struct mcspi *regs;
 115         unsigned int cs;
 116         unsigned int freq;
 117         unsigned int mode;
 118         unsigned int wordlen;
 119         unsigned int pin_dir:1;
 120 };
 121
 122 static void omap3_spi_write_chconf(struct omap3_spi_priv *priv, int val)
 123 {
 124         writel(val, &priv->regs->channel[priv->cs].chconf);
 125         /* Flash post writes to make immediate effect */
 126         readl(&priv->regs->channel[priv->cs].chconf);
 127 }
 128
 129 static void omap3_spi_set_enable(struct omap3_spi_priv *priv, int enable)
 130 {
 131         writel(enable, &priv->regs->channel[priv->cs].chctrl);
 132         /* Flash post writes to make immediate effect */
 133         readl(&priv->regs->channel[priv->cs].chctrl);
 134 }
 135
 136 static int omap3_spi_write(struct omap3_spi_priv *priv, unsigned int len,
 137                            const void *txp, unsigned long flags)
 138 {
 139         ulong start;
 140         int i, chconf;
 141
 142         chconf = readl(&priv->regs->channel[priv->cs].chconf);
 143
 144         /* Enable the channel */
 145         omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_EN);
 146
 147         chconf &= ~(OMAP3_MCSPI_CHCONF_TRM_MASK | OMAP3_MCSPI_CHCONF_WL_MASK);
 148         chconf |= (priv->wordlen - 1) << 7;
 149         chconf |= OMAP3_MCSPI_CHCONF_TRM_TX_ONLY;
 150         chconf |= OMAP3_MCSPI_CHCONF_FORCE;
 151         omap3_spi_write_chconf(priv, chconf);
 152
 153         for (i = 0; i < len; i++) {
 154                 /* wait till TX register is empty (TXS == 1) */
 155                 start = get_timer(0);
 156                 while (!(readl(&priv->regs->channel[priv->cs].chstat) &
 157                          OMAP3_MCSPI_CHSTAT_TXS)) {
 158                         if (get_timer(start) > SPI_WAIT_TIMEOUT) {
 159                                 printf("SPI TXS timed out, status=0x%08x\n",
 160                                         readl(&priv->regs->channel[priv->cs].chstat));
 161                                 return -1;
 162                         }
 163                 }
 164                 /* Write the data */
 165                 unsigned int *tx = &priv->regs->channel[priv->cs].tx;
 166                 if (priv->wordlen > 16)
 167                         writel(((u32 *)txp)[i], tx);
 168                 else if (priv->wordlen > 8)
 169                         writel(((u16 *)txp)[i], tx);
 170                 else
 171                         writel(((u8 *)txp)[i], tx);
 172         }
 173
 174         /* wait to finish of transfer */
 175         while ((readl(&priv->regs->channel[priv->cs].chstat) &
 176                         (OMAP3_MCSPI_CHSTAT_EOT | OMAP3_MCSPI_CHSTAT_TXS)) !=
 177                         (OMAP3_MCSPI_CHSTAT_EOT | OMAP3_MCSPI_CHSTAT_TXS))
 178                 ;
 179
 180         /* Disable the channel otherwise the next immediate RX will get affected */
 181         omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_DIS);
 182
 183         if (flags & SPI_XFER_END) {
 184
 185                 chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
 186                 omap3_spi_write_chconf(priv, chconf);
 187         }
 188         return 0;
 189 }
 190
 191 static int omap3_spi_read(struct omap3_spi_priv *priv, unsigned int len,
 192                           void *rxp, unsigned long flags)
 193 {
 194         int i, chconf;
 195         ulong start;
 196
 197         chconf = readl(&priv->regs->channel[priv->cs].chconf);
 198
 199         /* Enable the channel */
 200         omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_EN);
 201
 202         chconf &= ~(OMAP3_MCSPI_CHCONF_TRM_MASK | OMAP3_MCSPI_CHCONF_WL_MASK);
 203         chconf |= (priv->wordlen - 1) << 7;
 204         chconf |= OMAP3_MCSPI_CHCONF_TRM_RX_ONLY;
 205         chconf |= OMAP3_MCSPI_CHCONF_FORCE;
 206         omap3_spi_write_chconf(priv, chconf);
 207
 208         writel(0, &priv->regs->channel[priv->cs].tx);
 209
 210         for (i = 0; i < len; i++) {
 211                 start = get_timer(0);
 212                 /* Wait till RX register contains data (RXS == 1) */
 213                 while (!(readl(&priv->regs->channel[priv->cs].chstat) &
 214                          OMAP3_MCSPI_CHSTAT_RXS)) {
 215                         if (get_timer(start) > SPI_WAIT_TIMEOUT) {
 216                                 printf("SPI RXS timed out, status=0x%08x\n",
 217                                         readl(&priv->regs->channel[priv->cs].chstat));
 218                                 return -1;
 219                         }
 220                 }
 221
 222                 /* Disable the channel to prevent furher receiving */
 223                 if (i == (len - 1))
 224                         omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_DIS);
 225
 226                 /* Read the data */
 227                 unsigned int *rx = &priv->regs->channel[priv->cs].rx;
 228                 if (priv->wordlen > 16)
 229                         ((u32 *)rxp)[i] = readl(rx);
 230                 else if (priv->wordlen > 8)
 231                         ((u16 *)rxp)[i] = (u16)readl(rx);
 232                 else
 233                         ((u8 *)rxp)[i] = (u8)readl(rx);
 234         }
 235
 236         if (flags & SPI_XFER_END) {
 237                 chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
 238                 omap3_spi_write_chconf(priv, chconf);
 239         }
 240
 241         return 0;
 242 }
 243
 244 /*McSPI Transmit Receive Mode*/
 245 static int omap3_spi_txrx(struct omap3_spi_priv *priv, unsigned int len,
 246                           const void *txp, void *rxp, unsigned long flags)
 247 {
 248         ulong start;
 249         int chconf, i = 0;
 250
 251         chconf = readl(&priv->regs->channel[priv->cs].chconf);
 252
 253         /*Enable SPI channel*/
 254         omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_EN);
 255
 256         /*set TRANSMIT-RECEIVE Mode*/
 257         chconf &= ~(OMAP3_MCSPI_CHCONF_TRM_MASK | OMAP3_MCSPI_CHCONF_WL_MASK);
 258         chconf |= (priv->wordlen - 1) << 7;
 259         chconf |= OMAP3_MCSPI_CHCONF_FORCE;
 260         omap3_spi_write_chconf(priv, chconf);
 261
 262         /*Shift in and out 1 byte at time*/
 263         for (i=0; i < len; i++){
 264                 /* Write: wait for TX empty (TXS == 1)*/
 265                 start = get_timer(0);
 266                 while (!(readl(&priv->regs->channel[priv->cs].chstat) &
 267                          OMAP3_MCSPI_CHSTAT_TXS)) {
 268                         if (get_timer(start) > SPI_WAIT_TIMEOUT) {
 269                                 printf("SPI TXS timed out, status=0x%08x\n",
 270                                         readl(&priv->regs->channel[priv->cs].chstat));
 271                                 return -1;
 272                         }
 273                 }
 274                 /* Write the data */
 275                 unsigned int *tx = &priv->regs->channel[priv->cs].tx;
 276                 if (priv->wordlen > 16)
 277                         writel(((u32 *)txp)[i], tx);
 278                 else if (priv->wordlen > 8)
 279                         writel(((u16 *)txp)[i], tx);
 280                 else
 281                         writel(((u8 *)txp)[i], tx);
 282
 283                 /*Read: wait for RX containing data (RXS == 1)*/
 284                 start = get_timer(0);
 285                 while (!(readl(&priv->regs->channel[priv->cs].chstat) &
 286                          OMAP3_MCSPI_CHSTAT_RXS)) {
 287                         if (get_timer(start) > SPI_WAIT_TIMEOUT) {
 288                                 printf("SPI RXS timed out, status=0x%08x\n",
 289                                         readl(&priv->regs->channel[priv->cs].chstat));
 290                                 return -1;
 291                         }
 292                 }
 293                 /* Read the data */
 294                 unsigned int *rx = &priv->regs->channel[priv->cs].rx;
 295                 if (priv->wordlen > 16)
 296                         ((u32 *)rxp)[i] = readl(rx);
 297                 else if (priv->wordlen > 8)
 298                         ((u16 *)rxp)[i] = (u16)readl(rx);
 299                 else
 300                         ((u8 *)rxp)[i] = (u8)readl(rx);
 301         }
 302         /* Disable the channel */
 303         omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_DIS);
 304
 305         /*if transfer must be terminated disable the channel*/
 306         if (flags & SPI_XFER_END) {
 307                 chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
 308                 omap3_spi_write_chconf(priv, chconf);
 309         }
 310
 311         return 0;
 312 }
 313
 314 static int _spi_xfer(struct omap3_spi_priv *priv, unsigned int bitlen,
 315                      const void *dout, void *din, unsigned long flags)
 316 {
 317         unsigned int    len;
 318         int ret = -1;
 319
 320         if (priv->wordlen < 4 || priv->wordlen > 32) {
 321                 printf("omap3_spi: invalid wordlen %d\n", priv->wordlen);
 322                 return -1;
 323         }
 324
 325         if (bitlen % priv->wordlen)
 326                 return -1;
 327
 328         len = bitlen / priv->wordlen;
 329
 330         if (bitlen == 0) {       /* only change CS */
 331                 int chconf = readl(&priv->regs->channel[priv->cs].chconf);
 332
 333                 if (flags & SPI_XFER_BEGIN) {
 334                         omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_EN);
 335                         chconf |= OMAP3_MCSPI_CHCONF_FORCE;
 336                         omap3_spi_write_chconf(priv, chconf);
 337                 }
 338                 if (flags & SPI_XFER_END) {
 339                         chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
 340                         omap3_spi_write_chconf(priv, chconf);
 341                         omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_DIS);
 342                 }
 343                 ret = 0;
 344         } else {
 345                 if (dout != NULL && din != NULL)
 346                         ret = omap3_spi_txrx(priv, len, dout, din, flags);
 347                 else if (dout != NULL)
 348                         ret = omap3_spi_write(priv, len, dout, flags);
 349                 else if (din != NULL)
 350                         ret = omap3_spi_read(priv, len, din, flags);
 351         }
 352         return ret;
 353 }
 354
 355 static void _omap3_spi_set_speed(struct omap3_spi_priv *priv)
 356 {
 357         uint32_t confr, div = 0;
 358
 359         confr = readl(&priv->regs->channel[priv->cs].chconf);
 360
 361         /* Calculate clock divisor. Valid range: 0x0 - 0xC ( /1 - /4096 ) */
 362         if (priv->freq) {
 363                 while (div <= 0xC && (OMAP3_MCSPI_MAX_FREQ / (1 << div))
 364                                         > priv->freq)
 365                         div++;
 366         } else {
 367                  div = 0xC;
 368         }
 369
 370         /* set clock divisor */
 371         confr &= ~OMAP3_MCSPI_CHCONF_CLKD_MASK;
 372         confr |= div << 2;
 373
 374         omap3_spi_write_chconf(priv, confr);
 375 }
 376
 377 static void _omap3_spi_set_mode(struct omap3_spi_priv *priv)
 378 {
 379         uint32_t confr;
 380
 381         confr = readl(&priv->regs->channel[priv->cs].chconf);
 382
 383         /* standard 4-wire master mode:  SCK, MOSI/out, MISO/in, nCS
 384          * REVISIT: this controller could support SPI_3WIRE mode.
 385          */
 386         if (priv->pin_dir == MCSPI_PINDIR_D0_IN_D1_OUT) {
 387                 confr &= ~(OMAP3_MCSPI_CHCONF_IS|OMAP3_MCSPI_CHCONF_DPE1);
 388                 confr |= OMAP3_MCSPI_CHCONF_DPE0;
 389         } else {
 390                 confr &= ~OMAP3_MCSPI_CHCONF_DPE0;
 391                 confr |= OMAP3_MCSPI_CHCONF_IS|OMAP3_MCSPI_CHCONF_DPE1;
 392         }
 393
 394         /* set SPI mode 0..3 */
 395         confr &= ~(OMAP3_MCSPI_CHCONF_POL | OMAP3_MCSPI_CHCONF_PHA);
 396         if (priv->mode & SPI_CPHA)
 397                 confr |= OMAP3_MCSPI_CHCONF_PHA;
 398         if (priv->mode & SPI_CPOL)
 399                 confr |= OMAP3_MCSPI_CHCONF_POL;
 400
 401         /* set chipselect polarity; manage with FORCE */
 402         if (!(priv->mode & SPI_CS_HIGH))
 403                 confr |= OMAP3_MCSPI_CHCONF_EPOL; /* active-low; normal */
 404         else
 405                 confr &= ~OMAP3_MCSPI_CHCONF_EPOL;
 406
 407         /* Transmit & receive mode */
 408         confr &= ~OMAP3_MCSPI_CHCONF_TRM_MASK;
 409
 410         omap3_spi_write_chconf(priv, confr);
 411 }
 412
 413 static void _omap3_spi_set_wordlen(struct omap3_spi_priv *priv)
 414 {
 415         unsigned int confr;
 416
 417         /* McSPI individual channel configuration */
 418         confr = readl(&priv->regs->channel[priv->cs].chconf);
 419
 420         /* wordlength */
 421         confr &= ~OMAP3_MCSPI_CHCONF_WL_MASK;
 422         confr |= (priv->wordlen - 1) << 7;
 423
 424         omap3_spi_write_chconf(priv, confr);
 425 }
 426
 427 static void spi_reset(struct mcspi *regs)
 428 {
 429         unsigned int tmp;
 430
 431         writel(OMAP3_MCSPI_SYSCONFIG_SOFTRESET, &regs->sysconfig);
 432         do {
 433                 tmp = readl(&regs->sysstatus);
 434         } while (!(tmp & OMAP3_MCSPI_SYSSTATUS_RESETDONE));
 435
 436         writel(OMAP3_MCSPI_SYSCONFIG_AUTOIDLE |
 437                OMAP3_MCSPI_SYSCONFIG_ENAWAKEUP |
 438                OMAP3_MCSPI_SYSCONFIG_SMARTIDLE, &regs->sysconfig);
 439
 440         writel(OMAP3_MCSPI_WAKEUPENABLE_WKEN, &regs->wakeupenable);
 441 }
 442
 443 static void _omap3_spi_claim_bus(struct omap3_spi_priv *priv)
 444 {
 445         unsigned int conf;
 446         /*
 447          * setup when switching from (reset default) slave mode
 448          * to single-channel master mode
 449          */
 450         conf = readl(&priv->regs->modulctrl);
 451         conf &= ~(OMAP3_MCSPI_MODULCTRL_STEST | OMAP3_MCSPI_MODULCTRL_MS);
 452         conf |= OMAP3_MCSPI_MODULCTRL_SINGLE;
 453
 454         writel(conf, &priv->regs->modulctrl);
 455 }
 456
 457 #ifndef CONFIG_DM_SPI
 458
 459 static inline struct omap3_spi_priv *to_omap3_spi(struct spi_slave *slave)
 460 {
 461         return container_of(slave, struct omap3_spi_priv, slave);
 462 }
 463
 464 void spi_free_slave(struct spi_slave *slave)
 465 {
 466         struct omap3_spi_priv *priv = to_omap3_spi(slave);
 467
 468         free(priv);
 469 }
 470
 471 int spi_claim_bus(struct spi_slave *slave)
 472 {
 473         struct omap3_spi_priv *priv = to_omap3_spi(slave);
 474
 475         spi_reset(priv->regs);
 476
 477         _omap3_spi_claim_bus(priv);
 478         _omap3_spi_set_wordlen(priv);
 479         _omap3_spi_set_mode(priv);
 480         _omap3_spi_set_speed(priv);
 481
 482         return 0;
 483 }
 484
 485 void spi_release_bus(struct spi_slave *slave)
 486 {
 487         struct omap3_spi_priv *priv = to_omap3_spi(slave);
 488
 489         writel(OMAP3_MCSPI_MODULCTRL_MS, &priv->regs->modulctrl);
 490 }
 491
 492 struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
 493                                      unsigned int max_hz, unsigned int mode)
 494 {
 495         struct omap3_spi_priv *priv;
 496         struct mcspi *regs;
 497
 498         /*
 499          * OMAP3 McSPI (MultiChannel SPI) has 4 busses (modules)
 500          * with different number of chip selects (CS, channels):
 501          * McSPI1 has 4 CS (bus 0, cs 0 - 3)
 502          * McSPI2 has 2 CS (bus 1, cs 0 - 1)
 503          * McSPI3 has 2 CS (bus 2, cs 0 - 1)
 504          * McSPI4 has 1 CS (bus 3, cs 0)
 505          */
 506
 507         switch (bus) {
 508         case 0:
 509                  regs = (struct mcspi *)OMAP3_MCSPI1_BASE;
 510                  break;
 511 #ifdef OMAP3_MCSPI2_BASE
 512         case 1:
 513                  regs = (struct mcspi *)OMAP3_MCSPI2_BASE;
 514                  break;
 515 #endif
 516 #ifdef OMAP3_MCSPI3_BASE
 517         case 2:
 518                  regs = (struct mcspi *)OMAP3_MCSPI3_BASE;
 519                  break;
 520 #endif
 521 #ifdef OMAP3_MCSPI4_BASE
 522         case 3:
 523                  regs = (struct mcspi *)OMAP3_MCSPI4_BASE;
 524                  break;
 525 #endif
 526         default:
 527                  printf("SPI error: unsupported bus %i.  Supported busses 0 - 3\n", bus);
 528                  return NULL;
 529         }
 530
 531         if (((bus == 0) && (cs > 3)) ||
 532             ((bus == 1) && (cs > 1)) ||
 533             ((bus == 2) && (cs > 1)) ||
 534             ((bus == 3) && (cs > 0))) {
 535                 printf("SPI error: unsupported chip select %i on bus %i\n", cs, bus);
 536                 return NULL;
 537         }
 538
 539         if (max_hz > OMAP3_MCSPI_MAX_FREQ) {
 540                 printf("SPI error: unsupported frequency %i Hz. Max frequency is 48 MHz\n",
 541                        max_hz);
 542                 return NULL;
 543         }
 544
 545         if (mode > SPI_MODE_3) {
 546                 printf("SPI error: unsupported SPI mode %i\n", mode);
 547                 return NULL;
 548         }
 549
 550         priv = spi_alloc_slave(struct omap3_spi_priv, bus, cs);
 551         if (!priv) {
 552                 printf("SPI error: malloc of SPI structure failed\n");
 553                 return NULL;
 554         }
 555
 556         priv->regs = regs;
 557         priv->cs = cs;
 558         priv->freq = max_hz;
 559         priv->mode = mode;
 560         priv->wordlen = priv->slave.wordlen;
 561 #if 0
 562         /* Please migrate to DM_SPI support for this feature. */
 563         priv->pin_dir = MCSPI_PINDIR_D0_OUT_D1_IN;
 564 #endif
 565
 566         return &priv->slave;
 567 }
 568
 569 int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
 570              const void *dout, void *din, unsigned long flags)
 571 {
 572         struct omap3_spi_priv *priv = to_omap3_spi(slave);
 573
 574         return _spi_xfer(priv, bitlen, dout, din, flags);
 575 }
 576
 577 #else
 578
 579 static int omap3_spi_claim_bus(struct udevice *dev)
 580 {
 581         struct udevice *bus = dev->parent;
 582         struct omap3_spi_priv *priv = dev_get_priv(bus);
 583         struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
 584
 585         priv->cs = slave_plat->cs;
 586         priv->freq = slave_plat->max_hz;
 587
 588         _omap3_spi_claim_bus(priv);
 589
 590         return 0;
 591 }
 592
 593 static int omap3_spi_release_bus(struct udevice *dev)
 594 {
 595         struct udevice *bus = dev->parent;
 596         struct omap3_spi_priv *priv = dev_get_priv(bus);
 597
 598         writel(OMAP3_MCSPI_MODULCTRL_MS, &priv->regs->modulctrl);
 599
 600         return 0;
 601 }
 602
 603 static int omap3_spi_set_wordlen(struct udevice *dev, unsigned int wordlen)
 604 {
 605         struct udevice *bus = dev->parent;
 606         struct omap3_spi_priv *priv = dev_get_priv(bus);
 607         struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
 608
 609         priv->cs = slave_plat->cs;
 610         priv->wordlen = wordlen;
 611         _omap3_spi_set_wordlen(priv);
 612
 613         return 0;
 614 }
 615
 616 static int omap3_spi_probe(struct udevice *dev)
 617 {
 618         struct omap3_spi_priv *priv = dev_get_priv(dev);
 619         const void *blob = gd->fdt_blob;
 620         int node = dev_of_offset(dev);
 621
 622         struct omap2_mcspi_platform_config* data =
 623                 (struct omap2_mcspi_platform_config*)dev_get_driver_data(dev);
 624
 625         priv->regs = (struct mcspi *)(devfdt_get_addr(dev) + data->regs_offset);
 626         if (fdtdec_get_bool(blob, node, "ti,pindir-d0-out-d1-in"))
 627                 priv->pin_dir = MCSPI_PINDIR_D0_OUT_D1_IN;
 628         else
 629                 priv->pin_dir = MCSPI_PINDIR_D0_IN_D1_OUT;
 630         priv->wordlen = SPI_DEFAULT_WORDLEN;
 631
 632         spi_reset(priv->regs);
 633
 634         return 0;
 635 }
 636
 637 static int omap3_spi_xfer(struct udevice *dev, unsigned int bitlen,
 638                             const void *dout, void *din, unsigned long flags)
 639 {
 640         struct udevice *bus = dev->parent;
 641         struct omap3_spi_priv *priv = dev_get_priv(bus);
 642
 643         return _spi_xfer(priv, bitlen, dout, din, flags);
 644 }
 645
 646 static int omap3_spi_set_speed(struct udevice *dev, unsigned int speed)
 647 {
 648
 649         struct omap3_spi_priv *priv = dev_get_priv(dev);
 650
 651         priv->freq = speed;
 652         _omap3_spi_set_speed(priv);
 653
 654         return 0;
 655 }
 656
 657 static int omap3_spi_set_mode(struct udevice *dev, uint mode)
 658 {
 659         struct omap3_spi_priv *priv = dev_get_priv(dev);
 660
 661         priv->mode = mode;
 662
 663         _omap3_spi_set_mode(priv);
 664
 665         return 0;
 666 }
 667
 668 static const struct dm_spi_ops omap3_spi_ops = {
 669         .claim_bus      = omap3_spi_claim_bus,
 670         .release_bus    = omap3_spi_release_bus,
 671         .set_wordlen    = omap3_spi_set_wordlen,
 672         .xfer       = omap3_spi_xfer,
 673         .set_speed      = omap3_spi_set_speed,
 674         .set_mode       = omap3_spi_set_mode,
 675         /*
 676          * cs_info is not needed, since we require all chip selects to be
 677          * in the device tree explicitly
 678          */
 679 };
 680
 681 static struct omap2_mcspi_platform_config omap2_pdata = {
 682         .regs_offset = 0,
 683 };
 684
 685 static struct omap2_mcspi_platform_config omap4_pdata = {
 686         .regs_offset = OMAP4_MCSPI_REG_OFFSET,
 687 };
 688
 689 static const struct udevice_id omap3_spi_ids[] = {
 690         { .compatible = "ti,omap2-mcspi", .data = (ulong)&omap2_pdata },
 691         { .compatible = "ti,omap4-mcspi", .data = (ulong)&omap4_pdata },
 692         { }
 693 };
 694
 695 U_BOOT_DRIVER(omap3_spi) = {
 696         .name   = "omap3_spi",
 697         .id     = UCLASS_SPI,
 698         .of_match = omap3_spi_ids,
 699         .probe = omap3_spi_probe,
 700         .ops    = &omap3_spi_ops,
 701         .priv_auto_alloc_size = sizeof(struct omap3_spi_priv),
 702 };
 703 #endif