drivers/spi/stm32_qspi.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2016
   4  *
   5  * Michael Kurz, <michi.kurz@gmail.com>
   6  *
   7  * STM32 QSPI driver
   8  */
   9
  10 #include <common.h>
  11 #include <clk.h>
  12 #include <dm.h>
  13 #include <errno.h>
  14 #include <malloc.h>
  15 #include <spi.h>
  16 #include <spi_flash.h>
  17 #include <asm/io.h>
  18 #include <asm/arch/stm32.h>
  19
  20 DECLARE_GLOBAL_DATA_PTR;
  21
  22 struct stm32_qspi_regs {
  23         u32 cr;         /* 0x00 */
  24         u32 dcr;        /* 0x04 */
  25         u32 sr;         /* 0x08 */
  26         u32 fcr;        /* 0x0C */
  27         u32 dlr;        /* 0x10 */
  28         u32 ccr;        /* 0x14 */
  29         u32 ar;         /* 0x18 */
  30         u32 abr;        /* 0x1C */
  31         u32 dr;         /* 0x20 */
  32         u32 psmkr;      /* 0x24 */
  33         u32 psmar;      /* 0x28 */
  34         u32 pir;        /* 0x2C */
  35         u32 lptr;       /* 0x30 */
  36 };
  37
  38 /*
  39  * QUADSPI control register
  40  */
  41 #define STM32_QSPI_CR_EN                BIT(0)
  42 #define STM32_QSPI_CR_ABORT             BIT(1)
  43 #define STM32_QSPI_CR_DMAEN             BIT(2)
  44 #define STM32_QSPI_CR_TCEN              BIT(3)
  45 #define STM32_QSPI_CR_SSHIFT            BIT(4)
  46 #define STM32_QSPI_CR_DFM               BIT(6)
  47 #define STM32_QSPI_CR_FSEL              BIT(7)
  48 #define STM32_QSPI_CR_FTHRES_MASK       GENMASK(4, 0)
  49 #define STM32_QSPI_CR_FTHRES_SHIFT      (8)
  50 #define STM32_QSPI_CR_TEIE              BIT(16)
  51 #define STM32_QSPI_CR_TCIE              BIT(17)
  52 #define STM32_QSPI_CR_FTIE              BIT(18)
  53 #define STM32_QSPI_CR_SMIE              BIT(19)
  54 #define STM32_QSPI_CR_TOIE              BIT(20)
  55 #define STM32_QSPI_CR_APMS              BIT(22)
  56 #define STM32_QSPI_CR_PMM               BIT(23)
  57 #define STM32_QSPI_CR_PRESCALER_MASK    GENMASK(7, 0)
  58 #define STM32_QSPI_CR_PRESCALER_SHIFT   (24)
  59
  60 /*
  61  * QUADSPI device configuration register
  62  */
  63 #define STM32_QSPI_DCR_CKMODE           BIT(0)
  64 #define STM32_QSPI_DCR_CSHT_MASK        GENMASK(2, 0)
  65 #define STM32_QSPI_DCR_CSHT_SHIFT       (8)
  66 #define STM32_QSPI_DCR_FSIZE_MASK       GENMASK(4, 0)
  67 #define STM32_QSPI_DCR_FSIZE_SHIFT      (16)
  68
  69 /*
  70  * QUADSPI status register
  71  */
  72 #define STM32_QSPI_SR_TEF               BIT(0)
  73 #define STM32_QSPI_SR_TCF               BIT(1)
  74 #define STM32_QSPI_SR_FTF               BIT(2)
  75 #define STM32_QSPI_SR_SMF               BIT(3)
  76 #define STM32_QSPI_SR_TOF               BIT(4)
  77 #define STM32_QSPI_SR_BUSY              BIT(5)
  78 #define STM32_QSPI_SR_FLEVEL_MASK       GENMASK(5, 0)
  79 #define STM32_QSPI_SR_FLEVEL_SHIFT      (8)
  80
  81 /*
  82  * QUADSPI flag clear register
  83  */
  84 #define STM32_QSPI_FCR_CTEF             BIT(0)
  85 #define STM32_QSPI_FCR_CTCF             BIT(1)
  86 #define STM32_QSPI_FCR_CSMF             BIT(3)
  87 #define STM32_QSPI_FCR_CTOF             BIT(4)
  88
  89 /*
  90  * QUADSPI communication configuration register
  91  */
  92 #define STM32_QSPI_CCR_DDRM             BIT(31)
  93 #define STM32_QSPI_CCR_DHHC             BIT(30)
  94 #define STM32_QSPI_CCR_SIOO             BIT(28)
  95 #define STM32_QSPI_CCR_FMODE_SHIFT      (26)
  96 #define STM32_QSPI_CCR_DMODE_SHIFT      (24)
  97 #define STM32_QSPI_CCR_DCYC_SHIFT       (18)
  98 #define STM32_QSPI_CCR_DCYC_MASK        GENMASK(4, 0)
  99 #define STM32_QSPI_CCR_ABSIZE_SHIFT     (16)
 100 #define STM32_QSPI_CCR_ABMODE_SHIFT     (14)
 101 #define STM32_QSPI_CCR_ADSIZE_SHIFT     (12)
 102 #define STM32_QSPI_CCR_ADMODE_SHIFT     (10)
 103 #define STM32_QSPI_CCR_IMODE_SHIFT      (8)
 104 #define STM32_QSPI_CCR_INSTRUCTION_MASK GENMASK(7, 0)
 105
 106 enum STM32_QSPI_CCR_IMODE {
 107         STM32_QSPI_CCR_IMODE_NONE = 0,
 108         STM32_QSPI_CCR_IMODE_ONE_LINE = 1,
 109         STM32_QSPI_CCR_IMODE_TWO_LINE = 2,
 110         STM32_QSPI_CCR_IMODE_FOUR_LINE = 3,
 111 };
 112
 113 enum STM32_QSPI_CCR_ADMODE {
 114         STM32_QSPI_CCR_ADMODE_NONE = 0,
 115         STM32_QSPI_CCR_ADMODE_ONE_LINE = 1,
 116         STM32_QSPI_CCR_ADMODE_TWO_LINE = 2,
 117         STM32_QSPI_CCR_ADMODE_FOUR_LINE = 3,
 118 };
 119
 120 enum STM32_QSPI_CCR_ADSIZE {
 121         STM32_QSPI_CCR_ADSIZE_8BIT = 0,
 122         STM32_QSPI_CCR_ADSIZE_16BIT = 1,
 123         STM32_QSPI_CCR_ADSIZE_24BIT = 2,
 124         STM32_QSPI_CCR_ADSIZE_32BIT = 3,
 125 };
 126
 127 enum STM32_QSPI_CCR_ABMODE {
 128         STM32_QSPI_CCR_ABMODE_NONE = 0,
 129         STM32_QSPI_CCR_ABMODE_ONE_LINE = 1,
 130         STM32_QSPI_CCR_ABMODE_TWO_LINE = 2,
 131         STM32_QSPI_CCR_ABMODE_FOUR_LINE = 3,
 132 };
 133
 134 enum STM32_QSPI_CCR_ABSIZE {
 135         STM32_QSPI_CCR_ABSIZE_8BIT = 0,
 136         STM32_QSPI_CCR_ABSIZE_16BIT = 1,
 137         STM32_QSPI_CCR_ABSIZE_24BIT = 2,
 138         STM32_QSPI_CCR_ABSIZE_32BIT = 3,
 139 };
 140
 141 enum STM32_QSPI_CCR_DMODE {
 142         STM32_QSPI_CCR_DMODE_NONE = 0,
 143         STM32_QSPI_CCR_DMODE_ONE_LINE = 1,
 144         STM32_QSPI_CCR_DMODE_TWO_LINE = 2,
 145         STM32_QSPI_CCR_DMODE_FOUR_LINE = 3,
 146 };
 147
 148 enum STM32_QSPI_CCR_FMODE {
 149         STM32_QSPI_CCR_IND_WRITE = 0,
 150         STM32_QSPI_CCR_IND_READ = 1,
 151         STM32_QSPI_CCR_AUTO_POLL = 2,
 152         STM32_QSPI_CCR_MEM_MAP = 3,
 153 };
 154
 155 /* default SCK frequency, unit: HZ */
 156 #define STM32_QSPI_DEFAULT_SCK_FREQ 108000000
 157
 158 #define STM32_MAX_NORCHIP 2
 159
 160 struct stm32_qspi_platdata {
 161         u32 base;
 162         u32 memory_map;
 163         u32 max_hz;
 164 };
 165
 166 struct stm32_qspi_priv {
 167         struct stm32_qspi_regs *regs;
 168         ulong clock_rate;
 169         u32 max_hz;
 170         u32 mode;
 171
 172         u32 command;
 173         u32 address;
 174         u32 dummycycles;
 175 #define CMD_HAS_ADR     BIT(24)
 176 #define CMD_HAS_DUMMY   BIT(25)
 177 #define CMD_HAS_DATA    BIT(26)
 178 };
 179
 180 static void _stm32_qspi_disable(struct stm32_qspi_priv *priv)
 181 {
 182         clrbits_le32(&priv->regs->cr, STM32_QSPI_CR_EN);
 183 }
 184
 185 static void _stm32_qspi_enable(struct stm32_qspi_priv *priv)
 186 {
 187         setbits_le32(&priv->regs->cr, STM32_QSPI_CR_EN);
 188 }
 189
 190 static void _stm32_qspi_wait_for_not_busy(struct stm32_qspi_priv *priv)
 191 {
 192         while (readl(&priv->regs->sr) & STM32_QSPI_SR_BUSY)
 193                 ;
 194 }
 195
 196 static void _stm32_qspi_wait_for_complete(struct stm32_qspi_priv *priv)
 197 {
 198         while (!(readl(&priv->regs->sr) & STM32_QSPI_SR_TCF))
 199                 ;
 200 }
 201
 202 static void _stm32_qspi_wait_for_ftf(struct stm32_qspi_priv *priv)
 203 {
 204         while (!(readl(&priv->regs->sr) & STM32_QSPI_SR_FTF))
 205                 ;
 206 }
 207
 208 static void _stm32_qspi_set_flash_size(struct stm32_qspi_priv *priv, u32 size)
 209 {
 210         u32 fsize = fls(size) - 1;
 211
 212         clrsetbits_le32(&priv->regs->dcr,
 213                         STM32_QSPI_DCR_FSIZE_MASK << STM32_QSPI_DCR_FSIZE_SHIFT,
 214                         fsize << STM32_QSPI_DCR_FSIZE_SHIFT);
 215 }
 216
 217 static void _stm32_qspi_set_cs(struct stm32_qspi_priv *priv, unsigned int cs)
 218 {
 219         clrsetbits_le32(&priv->regs->cr, STM32_QSPI_CR_FSEL,
 220                         cs ? STM32_QSPI_CR_FSEL : 0);
 221 }
 222
 223 static unsigned int _stm32_qspi_gen_ccr(struct stm32_qspi_priv *priv)
 224 {
 225         unsigned int ccr_reg = 0;
 226         u8 imode, admode, dmode;
 227         u32 mode = priv->mode;
 228         u32 cmd = (priv->command & STM32_QSPI_CCR_INSTRUCTION_MASK);
 229
 230         imode = STM32_QSPI_CCR_IMODE_ONE_LINE;
 231         admode = STM32_QSPI_CCR_ADMODE_ONE_LINE;
 232
 233         if (mode & SPI_RX_QUAD) {
 234                 dmode = STM32_QSPI_CCR_DMODE_FOUR_LINE;
 235                 if (mode & SPI_TX_QUAD) {
 236                         imode = STM32_QSPI_CCR_IMODE_FOUR_LINE;
 237                         admode = STM32_QSPI_CCR_ADMODE_FOUR_LINE;
 238                 }
 239         } else if (mode & SPI_RX_DUAL) {
 240                 dmode = STM32_QSPI_CCR_DMODE_TWO_LINE;
 241                 if (mode & SPI_TX_DUAL) {
 242                         imode = STM32_QSPI_CCR_IMODE_TWO_LINE;
 243                         admode = STM32_QSPI_CCR_ADMODE_TWO_LINE;
 244                 }
 245         } else {
 246                 dmode = STM32_QSPI_CCR_DMODE_ONE_LINE;
 247         }
 248
 249         if (priv->command & CMD_HAS_DATA)
 250                 ccr_reg |= (dmode << STM32_QSPI_CCR_DMODE_SHIFT);
 251
 252         if (priv->command & CMD_HAS_DUMMY)
 253                 ccr_reg |= ((priv->dummycycles & STM32_QSPI_CCR_DCYC_MASK)
 254                                 << STM32_QSPI_CCR_DCYC_SHIFT);
 255
 256         if (priv->command & CMD_HAS_ADR) {
 257                 ccr_reg |= (STM32_QSPI_CCR_ADSIZE_24BIT
 258                                 << STM32_QSPI_CCR_ADSIZE_SHIFT);
 259                 ccr_reg |= (admode << STM32_QSPI_CCR_ADMODE_SHIFT);
 260         }
 261         ccr_reg |= (imode << STM32_QSPI_CCR_IMODE_SHIFT);
 262         ccr_reg |= cmd;
 263         return ccr_reg;
 264 }
 265
 266 static void _stm32_qspi_enable_mmap(struct stm32_qspi_priv *priv,
 267                                     struct spi_flash *flash)
 268 {
 269         unsigned int ccr_reg;
 270
 271         priv->command = flash->read_cmd | CMD_HAS_ADR | CMD_HAS_DATA
 272                         | CMD_HAS_DUMMY;
 273         priv->dummycycles = flash->dummy_byte * 8;
 274
 275         ccr_reg = _stm32_qspi_gen_ccr(priv);
 276         ccr_reg |= (STM32_QSPI_CCR_MEM_MAP << STM32_QSPI_CCR_FMODE_SHIFT);
 277
 278         _stm32_qspi_wait_for_not_busy(priv);
 279
 280         writel(ccr_reg, &priv->regs->ccr);
 281
 282         priv->dummycycles = 0;
 283 }
 284
 285 static void _stm32_qspi_disable_mmap(struct stm32_qspi_priv *priv)
 286 {
 287         setbits_le32(&priv->regs->cr, STM32_QSPI_CR_ABORT);
 288 }
 289
 290 static void _stm32_qspi_set_xfer_length(struct stm32_qspi_priv *priv,
 291                                         u32 length)
 292 {
 293         writel(length - 1, &priv->regs->dlr);
 294 }
 295
 296 static void _stm32_qspi_start_xfer(struct stm32_qspi_priv *priv, u32 cr_reg)
 297 {
 298         writel(cr_reg, &priv->regs->ccr);
 299
 300         if (priv->command & CMD_HAS_ADR)
 301                 writel(priv->address, &priv->regs->ar);
 302 }
 303
 304 static int _stm32_qspi_xfer(struct stm32_qspi_priv *priv,
 305                             struct spi_flash *flash, unsigned int bitlen,
 306                             const u8 *dout, u8 *din, unsigned long flags)
 307 {
 308         unsigned int words = bitlen / 8;
 309         u32 ccr_reg;
 310         int i;
 311
 312         if (flags & SPI_XFER_MMAP) {
 313                 _stm32_qspi_enable_mmap(priv, flash);
 314                 return 0;
 315         } else if (flags & SPI_XFER_MMAP_END) {
 316                 _stm32_qspi_disable_mmap(priv);
 317                 return 0;
 318         }
 319
 320         if (bitlen == 0)
 321                 return -1;
 322
 323         if (bitlen % 8) {
 324                 debug("spi_xfer: Non byte aligned SPI transfer\n");
 325                 return -1;
 326         }
 327
 328         if (dout && din) {
 329                 debug("spi_xfer: QSPI cannot have data in and data out set\n");
 330                 return -1;
 331         }
 332
 333         if (!dout && (flags & SPI_XFER_BEGIN)) {
 334                 debug("spi_xfer: QSPI transfer must begin with command\n");
 335                 return -1;
 336         }
 337
 338         if (dout) {
 339                 if (flags & SPI_XFER_BEGIN) {
 340                         /* data is command */
 341                         priv->command = dout[0] | CMD_HAS_DATA;
 342                         if (words >= 4) {
 343                                 /* address is here too */
 344                                 priv->address = (dout[1] << 16) |
 345                                                 (dout[2] << 8) | dout[3];
 346                                 priv->command |= CMD_HAS_ADR;
 347                         }
 348
 349                         if (words > 4) {
 350                                 /* rest is dummy bytes */
 351                                 priv->dummycycles = (words - 4) * 8;
 352                                 priv->command |= CMD_HAS_DUMMY;
 353                         }
 354
 355                         if (flags & SPI_XFER_END) {
 356                                 /* command without data */
 357                                 priv->command &= ~(CMD_HAS_DATA);
 358                         }
 359                 }
 360
 361                 if (flags & SPI_XFER_END) {
 362                         ccr_reg = _stm32_qspi_gen_ccr(priv);
 363                         ccr_reg |= STM32_QSPI_CCR_IND_WRITE
 364                                         << STM32_QSPI_CCR_FMODE_SHIFT;
 365
 366                         _stm32_qspi_wait_for_not_busy(priv);
 367
 368                         if (priv->command & CMD_HAS_DATA)
 369                                 _stm32_qspi_set_xfer_length(priv, words);
 370
 371                         _stm32_qspi_start_xfer(priv, ccr_reg);
 372
 373                         debug("%s: write: ccr:0x%08x adr:0x%08x\n",
 374                               __func__, priv->regs->ccr, priv->regs->ar);
 375
 376                         if (priv->command & CMD_HAS_DATA) {
 377                                 _stm32_qspi_wait_for_ftf(priv);
 378
 379                                 debug("%s: words:%d data:", __func__, words);
 380
 381                                 i = 0;
 382                                 while (words > i) {
 383                                         writeb(dout[i], &priv->regs->dr);
 384                                         debug("%02x ", dout[i]);
 385                                         i++;
 386                                 }
 387                                 debug("\n");
 388
 389                                 _stm32_qspi_wait_for_complete(priv);
 390                         } else {
 391                                 _stm32_qspi_wait_for_not_busy(priv);
 392                         }
 393                 }
 394         } else if (din) {
 395                 ccr_reg = _stm32_qspi_gen_ccr(priv);
 396                 ccr_reg |= STM32_QSPI_CCR_IND_READ
 397                                 << STM32_QSPI_CCR_FMODE_SHIFT;
 398
 399                 _stm32_qspi_wait_for_not_busy(priv);
 400
 401                 _stm32_qspi_set_xfer_length(priv, words);
 402
 403                 _stm32_qspi_start_xfer(priv, ccr_reg);
 404
 405                 debug("%s: read: ccr:0x%08x adr:0x%08x len:%d\n", __func__,
 406                       priv->regs->ccr, priv->regs->ar, priv->regs->dlr);
 407
 408                 debug("%s: data:", __func__);
 409
 410                 i = 0;
 411                 while (words > i) {
 412                         din[i] = readb(&priv->regs->dr);
 413                         debug("%02x ", din[i]);
 414                         i++;
 415                 }
 416                 debug("\n");
 417         }
 418
 419         return 0;
 420 }
 421
 422 static int stm32_qspi_ofdata_to_platdata(struct udevice *bus)
 423 {
 424         struct fdt_resource res_regs, res_mem;
 425         struct stm32_qspi_platdata *plat = bus->platdata;
 426         const void *blob = gd->fdt_blob;
 427         int node = dev_of_offset(bus);
 428         int ret;
 429
 430         ret = fdt_get_named_resource(blob, node, "reg", "reg-names",
 431                                      "qspi", &res_regs);
 432         if (ret) {
 433                 debug("Error: can't get regs base addresses(ret = %d)!\n", ret);
 434                 return -ENOMEM;
 435         }
 436         ret = fdt_get_named_resource(blob, node, "reg", "reg-names",
 437                                      "qspi_mm", &res_mem);
 438         if (ret) {
 439                 debug("Error: can't get mmap base address(ret = %d)!\n", ret);
 440                 return -ENOMEM;
 441         }
 442
 443         plat->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency",
 444                                         STM32_QSPI_DEFAULT_SCK_FREQ);
 445
 446         plat->base = res_regs.start;
 447         plat->memory_map = res_mem.start;
 448
 449         debug("%s: regs=<0x%x> mapped=<0x%x>, max-frequency=%d\n",
 450               __func__,
 451               plat->base,
 452               plat->memory_map,
 453               plat->max_hz
 454               );
 455
 456         return 0;
 457 }
 458
 459 static int stm32_qspi_probe(struct udevice *bus)
 460 {
 461         struct stm32_qspi_platdata *plat = dev_get_platdata(bus);
 462         struct stm32_qspi_priv *priv = dev_get_priv(bus);
 463         struct dm_spi_bus *dm_spi_bus;
 464         struct clk clk;
 465         int ret;
 466
 467         dm_spi_bus = bus->uclass_priv;
 468
 469         dm_spi_bus->max_hz = plat->max_hz;
 470
 471         priv->regs = (struct stm32_qspi_regs *)(uintptr_t)plat->base;
 472
 473         priv->max_hz = plat->max_hz;
 474
 475         ret = clk_get_by_index(bus, 0, &clk);
 476         if (ret < 0)
 477                 return ret;
 478
 479         ret = clk_enable(&clk);
 480
 481         if (ret) {
 482                 dev_err(bus, "failed to enable clock\n");
 483                 return ret;
 484         }
 485
 486         priv->clock_rate = clk_get_rate(&clk);
 487         if (priv->clock_rate < 0) {
 488                 clk_disable(&clk);
 489                 return priv->clock_rate;
 490         }
 491
 492
 493         setbits_le32(&priv->regs->cr, STM32_QSPI_CR_SSHIFT);
 494
 495         return 0;
 496 }
 497
 498 static int stm32_qspi_remove(struct udevice *bus)
 499 {
 500         return 0;
 501 }
 502
 503 static int stm32_qspi_claim_bus(struct udevice *dev)
 504 {
 505         struct stm32_qspi_priv *priv;
 506         struct udevice *bus;
 507         struct spi_flash *flash;
 508         struct dm_spi_slave_platdata *slave_plat;
 509
 510         bus = dev->parent;
 511         priv = dev_get_priv(bus);
 512         flash = dev_get_uclass_priv(dev);
 513         slave_plat = dev_get_parent_platdata(dev);
 514
 515         if (slave_plat->cs >= STM32_MAX_NORCHIP)
 516                 return -ENODEV;
 517
 518         _stm32_qspi_set_cs(priv, slave_plat->cs);
 519
 520         _stm32_qspi_set_flash_size(priv, flash->size);
 521
 522         _stm32_qspi_enable(priv);
 523
 524         return 0;
 525 }
 526
 527 static int stm32_qspi_release_bus(struct udevice *dev)
 528 {
 529         struct stm32_qspi_priv *priv;
 530         struct udevice *bus;
 531
 532         bus = dev->parent;
 533         priv = dev_get_priv(bus);
 534
 535         _stm32_qspi_disable(priv);
 536
 537         return 0;
 538 }
 539
 540 static int stm32_qspi_xfer(struct udevice *dev, unsigned int bitlen,
 541                            const void *dout, void *din, unsigned long flags)
 542 {
 543         struct stm32_qspi_priv *priv;
 544         struct udevice *bus;
 545         struct spi_flash *flash;
 546
 547         bus = dev->parent;
 548         priv = dev_get_priv(bus);
 549         flash = dev_get_uclass_priv(dev);
 550
 551         return _stm32_qspi_xfer(priv, flash, bitlen, (const u8 *)dout,
 552                                 (u8 *)din, flags);
 553 }
 554
 555 static int stm32_qspi_set_speed(struct udevice *bus, uint speed)
 556 {
 557         struct stm32_qspi_platdata *plat = bus->platdata;
 558         struct stm32_qspi_priv *priv = dev_get_priv(bus);
 559         u32 qspi_clk = priv->clock_rate;
 560         u32 prescaler = 255;
 561         u32 csht;
 562
 563         if (speed > plat->max_hz)
 564                 speed = plat->max_hz;
 565
 566         if (speed > 0) {
 567                 prescaler = DIV_ROUND_UP(qspi_clk, speed) - 1;
 568                 if (prescaler > 255)
 569                         prescaler = 255;
 570                 else if (prescaler < 0)
 571                         prescaler = 0;
 572         }
 573
 574         csht = DIV_ROUND_UP((5 * qspi_clk) / (prescaler + 1), 100000000);
 575         csht = (csht - 1) & STM32_QSPI_DCR_CSHT_MASK;
 576
 577         _stm32_qspi_wait_for_not_busy(priv);
 578
 579         clrsetbits_le32(&priv->regs->cr,
 580                         STM32_QSPI_CR_PRESCALER_MASK <<
 581                         STM32_QSPI_CR_PRESCALER_SHIFT,
 582                         prescaler << STM32_QSPI_CR_PRESCALER_SHIFT);
 583
 584         clrsetbits_le32(&priv->regs->dcr,
 585                         STM32_QSPI_DCR_CSHT_MASK << STM32_QSPI_DCR_CSHT_SHIFT,
 586                         csht << STM32_QSPI_DCR_CSHT_SHIFT);
 587
 588         debug("%s: regs=%p, speed=%d\n", __func__, priv->regs,
 589               (qspi_clk / (prescaler + 1)));
 590
 591         return 0;
 592 }
 593
 594 static int stm32_qspi_set_mode(struct udevice *bus, uint mode)
 595 {
 596         struct stm32_qspi_priv *priv = dev_get_priv(bus);
 597
 598         _stm32_qspi_wait_for_not_busy(priv);
 599
 600         if ((mode & SPI_CPHA) && (mode & SPI_CPOL))
 601                 setbits_le32(&priv->regs->dcr, STM32_QSPI_DCR_CKMODE);
 602         else if (!(mode & SPI_CPHA) && !(mode & SPI_CPOL))
 603                 clrbits_le32(&priv->regs->dcr, STM32_QSPI_DCR_CKMODE);
 604         else
 605                 return -ENODEV;
 606
 607         if (mode & SPI_CS_HIGH)
 608                 return -ENODEV;
 609
 610         if (mode & SPI_RX_QUAD)
 611                 priv->mode |= SPI_RX_QUAD;
 612         else if (mode & SPI_RX_DUAL)
 613                 priv->mode |= SPI_RX_DUAL;
 614         else
 615                 priv->mode &= ~(SPI_RX_QUAD | SPI_RX_DUAL);
 616
 617         if (mode & SPI_TX_QUAD)
 618                 priv->mode |= SPI_TX_QUAD;
 619         else if (mode & SPI_TX_DUAL)
 620                 priv->mode |= SPI_TX_DUAL;
 621         else
 622                 priv->mode &= ~(SPI_TX_QUAD | SPI_TX_DUAL);
 623
 624         debug("%s: regs=%p, mode=%d rx: ", __func__, priv->regs, mode);
 625
 626         if (mode & SPI_RX_QUAD)
 627                 debug("quad, tx: ");
 628         else if (mode & SPI_RX_DUAL)
 629                 debug("dual, tx: ");
 630         else
 631                 debug("single, tx: ");
 632
 633         if (mode & SPI_TX_QUAD)
 634                 debug("quad\n");
 635         else if (mode & SPI_TX_DUAL)
 636                 debug("dual\n");
 637         else
 638                 debug("single\n");
 639
 640         return 0;
 641 }
 642
 643 static const struct dm_spi_ops stm32_qspi_ops = {
 644         .claim_bus      = stm32_qspi_claim_bus,
 645         .release_bus    = stm32_qspi_release_bus,
 646         .xfer           = stm32_qspi_xfer,
 647         .set_speed      = stm32_qspi_set_speed,
 648         .set_mode       = stm32_qspi_set_mode,
 649 };
 650
 651 static const struct udevice_id stm32_qspi_ids[] = {
 652         { .compatible = "st,stm32-qspi" },
 653         { .compatible = "st,stm32f469-qspi" },
 654         { }
 655 };
 656
 657 U_BOOT_DRIVER(stm32_qspi) = {
 658         .name   = "stm32_qspi",
 659         .id     = UCLASS_SPI,
 660         .of_match = stm32_qspi_ids,
 661         .ops    = &stm32_qspi_ops,
 662         .ofdata_to_platdata = stm32_qspi_ofdata_to_platdata,
 663         .platdata_auto_alloc_size = sizeof(struct stm32_qspi_platdata),
 664         .priv_auto_alloc_size = sizeof(struct stm32_qspi_priv),
 665         .probe  = stm32_qspi_probe,
 666         .remove = stm32_qspi_remove,
 667 };