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 <reset.h>
  16 #include <spi.h>
  17 #include <spi_flash.h>
  18 #include <asm/io.h>
  19 #include <asm/arch/stm32.h>
  20 #include <linux/ioport.h>
  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, u8 fmode)
 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         dmode = STM32_QSPI_CCR_DMODE_ONE_LINE;
 233
 234         if ((priv->command & CMD_HAS_ADR) && (priv->command & CMD_HAS_DATA)) {
 235                 if (fmode == STM32_QSPI_CCR_IND_WRITE) {
 236                         if (mode & SPI_TX_QUAD)
 237                                 dmode = STM32_QSPI_CCR_DMODE_FOUR_LINE;
 238                         else if (mode & SPI_TX_DUAL)
 239                                 dmode = STM32_QSPI_CCR_DMODE_TWO_LINE;
 240                 } else if ((fmode == STM32_QSPI_CCR_MEM_MAP) ||
 241                          (fmode == STM32_QSPI_CCR_IND_READ)) {
 242                         if (mode & SPI_RX_QUAD)
 243                                 dmode = STM32_QSPI_CCR_DMODE_FOUR_LINE;
 244                         else if (mode & SPI_RX_DUAL)
 245                                 dmode = STM32_QSPI_CCR_DMODE_TWO_LINE;
 246                 }
 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
 262         ccr_reg |= (fmode << STM32_QSPI_CCR_FMODE_SHIFT);
 263         ccr_reg |= (imode << STM32_QSPI_CCR_IMODE_SHIFT);
 264         ccr_reg |= cmd;
 265
 266         return ccr_reg;
 267 }
 268
 269 static void _stm32_qspi_enable_mmap(struct stm32_qspi_priv *priv,
 270                                     struct spi_flash *flash)
 271 {
 272         unsigned int ccr_reg;
 273
 274         priv->command = flash->read_cmd | CMD_HAS_ADR | CMD_HAS_DATA
 275                         | CMD_HAS_DUMMY;
 276         priv->dummycycles = flash->dummy_byte * 8;
 277
 278         ccr_reg = _stm32_qspi_gen_ccr(priv, STM32_QSPI_CCR_MEM_MAP);
 279
 280         _stm32_qspi_wait_for_not_busy(priv);
 281
 282         writel(ccr_reg, &priv->regs->ccr);
 283
 284         priv->dummycycles = 0;
 285 }
 286
 287 static void _stm32_qspi_disable_mmap(struct stm32_qspi_priv *priv)
 288 {
 289         setbits_le32(&priv->regs->cr, STM32_QSPI_CR_ABORT);
 290 }
 291
 292 static void _stm32_qspi_set_xfer_length(struct stm32_qspi_priv *priv,
 293                                         u32 length)
 294 {
 295         writel(length - 1, &priv->regs->dlr);
 296 }
 297
 298 static void _stm32_qspi_start_xfer(struct stm32_qspi_priv *priv, u32 cr_reg)
 299 {
 300         writel(cr_reg, &priv->regs->ccr);
 301
 302         if (priv->command & CMD_HAS_ADR)
 303                 writel(priv->address, &priv->regs->ar);
 304 }
 305
 306 static int _stm32_qspi_xfer(struct stm32_qspi_priv *priv,
 307                             struct spi_flash *flash, unsigned int bitlen,
 308                             const u8 *dout, u8 *din, unsigned long flags)
 309 {
 310         unsigned int words = bitlen / 8;
 311         u32 ccr_reg;
 312         int i;
 313
 314         if (flags & SPI_XFER_MMAP) {
 315                 _stm32_qspi_enable_mmap(priv, flash);
 316                 return 0;
 317         } else if (flags & SPI_XFER_MMAP_END) {
 318                 _stm32_qspi_disable_mmap(priv);
 319                 return 0;
 320         }
 321
 322         if (bitlen == 0)
 323                 return -1;
 324
 325         if (bitlen % 8) {
 326                 debug("spi_xfer: Non byte aligned SPI transfer\n");
 327                 return -1;
 328         }
 329
 330         if (dout && din) {
 331                 debug("spi_xfer: QSPI cannot have data in and data out set\n");
 332                 return -1;
 333         }
 334
 335         if (!dout && (flags & SPI_XFER_BEGIN)) {
 336                 debug("spi_xfer: QSPI transfer must begin with command\n");
 337                 return -1;
 338         }
 339
 340         if (dout) {
 341                 if (flags & SPI_XFER_BEGIN) {
 342                         /* data is command */
 343                         priv->command = dout[0] | CMD_HAS_DATA;
 344                         if (words >= 4) {
 345                                 /* address is here too */
 346                                 priv->address = (dout[1] << 16) |
 347                                                 (dout[2] << 8) | dout[3];
 348                                 priv->command |= CMD_HAS_ADR;
 349                         }
 350
 351                         if (words > 4) {
 352                                 /* rest is dummy bytes */
 353                                 priv->dummycycles = (words - 4) * 8;
 354                                 priv->command |= CMD_HAS_DUMMY;
 355                         }
 356
 357                         if (flags & SPI_XFER_END) {
 358                                 /* command without data */
 359                                 priv->command &= ~(CMD_HAS_DATA);
 360                         }
 361                 }
 362
 363                 if (flags & SPI_XFER_END) {
 364                         ccr_reg = _stm32_qspi_gen_ccr(priv,
 365                                                       STM32_QSPI_CCR_IND_WRITE);
 366
 367                         _stm32_qspi_wait_for_not_busy(priv);
 368
 369                         if (priv->command & CMD_HAS_DATA)
 370                                 _stm32_qspi_set_xfer_length(priv, words);
 371
 372                         _stm32_qspi_start_xfer(priv, ccr_reg);
 373
 374                         debug("%s: write: ccr:0x%08x adr:0x%08x\n",
 375                               __func__, priv->regs->ccr, priv->regs->ar);
 376
 377                         if (priv->command & CMD_HAS_DATA) {
 378                                 _stm32_qspi_wait_for_ftf(priv);
 379
 380                                 debug("%s: words:%d data:", __func__, words);
 381
 382                                 i = 0;
 383                                 while (words > i) {
 384                                         writeb(dout[i], &priv->regs->dr);
 385                                         debug("%02x ", dout[i]);
 386                                         i++;
 387                                 }
 388                                 debug("\n");
 389
 390                                 _stm32_qspi_wait_for_complete(priv);
 391                         } else {
 392                                 _stm32_qspi_wait_for_not_busy(priv);
 393                         }
 394                 }
 395         } else if (din) {
 396                 ccr_reg = _stm32_qspi_gen_ccr(priv, STM32_QSPI_CCR_IND_READ);
 397
 398                 _stm32_qspi_wait_for_not_busy(priv);
 399
 400                 _stm32_qspi_set_xfer_length(priv, words);
 401
 402                 _stm32_qspi_start_xfer(priv, ccr_reg);
 403
 404                 debug("%s: read: ccr:0x%08x adr:0x%08x len:%d\n", __func__,
 405                       priv->regs->ccr, priv->regs->ar, priv->regs->dlr);
 406
 407                 debug("%s: data:", __func__);
 408
 409                 i = 0;
 410                 while (words > i) {
 411                         din[i] = readb(&priv->regs->dr);
 412                         debug("%02x ", din[i]);
 413                         i++;
 414                 }
 415                 debug("\n");
 416         }
 417
 418         return 0;
 419 }
 420
 421 static int stm32_qspi_ofdata_to_platdata(struct udevice *bus)
 422 {
 423         struct resource res_regs, res_mem;
 424         struct stm32_qspi_platdata *plat = bus->platdata;
 425         int ret;
 426
 427         ret = dev_read_resource_byname(bus, "qspi", &res_regs);
 428         if (ret) {
 429                 debug("Error: can't get regs base addresses(ret = %d)!\n", ret);
 430                 return -ENOMEM;
 431         }
 432         ret = dev_read_resource_byname(bus, "qspi_mm", &res_mem);
 433         if (ret) {
 434                 debug("Error: can't get mmap base address(ret = %d)!\n", ret);
 435                 return -ENOMEM;
 436         }
 437
 438         plat->max_hz = dev_read_u32_default(bus, "spi-max-frequency",
 439                                             STM32_QSPI_DEFAULT_SCK_FREQ);
 440
 441         plat->base = res_regs.start;
 442         plat->memory_map = res_mem.start;
 443
 444         debug("%s: regs=<0x%x> mapped=<0x%x>, max-frequency=%d\n",
 445               __func__,
 446               plat->base,
 447               plat->memory_map,
 448               plat->max_hz
 449               );
 450
 451         return 0;
 452 }
 453
 454 static int stm32_qspi_probe(struct udevice *bus)
 455 {
 456         struct stm32_qspi_platdata *plat = dev_get_platdata(bus);
 457         struct stm32_qspi_priv *priv = dev_get_priv(bus);
 458         struct dm_spi_bus *dm_spi_bus;
 459         struct clk clk;
 460         struct reset_ctl reset_ctl;
 461         int ret;
 462
 463         dm_spi_bus = bus->uclass_priv;
 464
 465         dm_spi_bus->max_hz = plat->max_hz;
 466
 467         priv->regs = (struct stm32_qspi_regs *)(uintptr_t)plat->base;
 468
 469         priv->max_hz = plat->max_hz;
 470
 471         ret = clk_get_by_index(bus, 0, &clk);
 472         if (ret < 0)
 473                 return ret;
 474
 475         ret = clk_enable(&clk);
 476
 477         if (ret) {
 478                 dev_err(bus, "failed to enable clock\n");
 479                 return ret;
 480         }
 481
 482         priv->clock_rate = clk_get_rate(&clk);
 483         if (priv->clock_rate < 0) {
 484                 clk_disable(&clk);
 485                 return priv->clock_rate;
 486         }
 487
 488         ret = reset_get_by_index(bus, 0, &reset_ctl);
 489         if (ret) {
 490                 if (ret != -ENOENT) {
 491                         dev_err(bus, "failed to get reset\n");
 492                         clk_disable(&clk);
 493                         return ret;
 494                 }
 495         } else {
 496                 /* Reset QSPI controller */
 497                 reset_assert(&reset_ctl);
 498                 udelay(2);
 499                 reset_deassert(&reset_ctl);
 500         }
 501
 502         setbits_le32(&priv->regs->cr, STM32_QSPI_CR_SSHIFT);
 503
 504         return 0;
 505 }
 506
 507 static int stm32_qspi_remove(struct udevice *bus)
 508 {
 509         return 0;
 510 }
 511
 512 static int stm32_qspi_claim_bus(struct udevice *dev)
 513 {
 514         struct stm32_qspi_priv *priv;
 515         struct udevice *bus;
 516         struct spi_flash *flash;
 517         struct dm_spi_slave_platdata *slave_plat;
 518
 519         bus = dev->parent;
 520         priv = dev_get_priv(bus);
 521         flash = dev_get_uclass_priv(dev);
 522         slave_plat = dev_get_parent_platdata(dev);
 523
 524         if (slave_plat->cs >= STM32_MAX_NORCHIP)
 525                 return -ENODEV;
 526
 527         _stm32_qspi_set_cs(priv, slave_plat->cs);
 528
 529         _stm32_qspi_set_flash_size(priv, flash->size);
 530
 531         _stm32_qspi_enable(priv);
 532
 533         return 0;
 534 }
 535
 536 static int stm32_qspi_release_bus(struct udevice *dev)
 537 {
 538         struct stm32_qspi_priv *priv;
 539         struct udevice *bus;
 540
 541         bus = dev->parent;
 542         priv = dev_get_priv(bus);
 543
 544         _stm32_qspi_disable(priv);
 545
 546         return 0;
 547 }
 548
 549 static int stm32_qspi_xfer(struct udevice *dev, unsigned int bitlen,
 550                            const void *dout, void *din, unsigned long flags)
 551 {
 552         struct stm32_qspi_priv *priv;
 553         struct udevice *bus;
 554         struct spi_flash *flash;
 555
 556         bus = dev->parent;
 557         priv = dev_get_priv(bus);
 558         flash = dev_get_uclass_priv(dev);
 559
 560         return _stm32_qspi_xfer(priv, flash, bitlen, (const u8 *)dout,
 561                                 (u8 *)din, flags);
 562 }
 563
 564 static int stm32_qspi_set_speed(struct udevice *bus, uint speed)
 565 {
 566         struct stm32_qspi_platdata *plat = bus->platdata;
 567         struct stm32_qspi_priv *priv = dev_get_priv(bus);
 568         u32 qspi_clk = priv->clock_rate;
 569         u32 prescaler = 255;
 570         u32 csht;
 571
 572         if (speed > plat->max_hz)
 573                 speed = plat->max_hz;
 574
 575         if (speed > 0) {
 576                 prescaler = DIV_ROUND_UP(qspi_clk, speed) - 1;
 577                 if (prescaler > 255)
 578                         prescaler = 255;
 579                 else if (prescaler < 0)
 580                         prescaler = 0;
 581         }
 582
 583         csht = DIV_ROUND_UP((5 * qspi_clk) / (prescaler + 1), 100000000);
 584         csht = (csht - 1) & STM32_QSPI_DCR_CSHT_MASK;
 585
 586         _stm32_qspi_wait_for_not_busy(priv);
 587
 588         clrsetbits_le32(&priv->regs->cr,
 589                         STM32_QSPI_CR_PRESCALER_MASK <<
 590                         STM32_QSPI_CR_PRESCALER_SHIFT,
 591                         prescaler << STM32_QSPI_CR_PRESCALER_SHIFT);
 592
 593         clrsetbits_le32(&priv->regs->dcr,
 594                         STM32_QSPI_DCR_CSHT_MASK << STM32_QSPI_DCR_CSHT_SHIFT,
 595                         csht << STM32_QSPI_DCR_CSHT_SHIFT);
 596
 597         debug("%s: regs=%p, speed=%d\n", __func__, priv->regs,
 598               (qspi_clk / (prescaler + 1)));
 599
 600         return 0;
 601 }
 602
 603 static int stm32_qspi_set_mode(struct udevice *bus, uint mode)
 604 {
 605         struct stm32_qspi_priv *priv = dev_get_priv(bus);
 606
 607         _stm32_qspi_wait_for_not_busy(priv);
 608
 609         if ((mode & SPI_CPHA) && (mode & SPI_CPOL))
 610                 setbits_le32(&priv->regs->dcr, STM32_QSPI_DCR_CKMODE);
 611         else if (!(mode & SPI_CPHA) && !(mode & SPI_CPOL))
 612                 clrbits_le32(&priv->regs->dcr, STM32_QSPI_DCR_CKMODE);
 613         else
 614                 return -ENODEV;
 615
 616         if (mode & SPI_CS_HIGH)
 617                 return -ENODEV;
 618
 619         if (mode & SPI_RX_QUAD)
 620                 priv->mode |= SPI_RX_QUAD;
 621         else if (mode & SPI_RX_DUAL)
 622                 priv->mode |= SPI_RX_DUAL;
 623         else
 624                 priv->mode &= ~(SPI_RX_QUAD | SPI_RX_DUAL);
 625
 626         if (mode & SPI_TX_QUAD)
 627                 priv->mode |= SPI_TX_QUAD;
 628         else if (mode & SPI_TX_DUAL)
 629                 priv->mode |= SPI_TX_DUAL;
 630         else
 631                 priv->mode &= ~(SPI_TX_QUAD | SPI_TX_DUAL);
 632
 633         debug("%s: regs=%p, mode=%d rx: ", __func__, priv->regs, mode);
 634
 635         if (mode & SPI_RX_QUAD)
 636                 debug("quad, tx: ");
 637         else if (mode & SPI_RX_DUAL)
 638                 debug("dual, tx: ");
 639         else
 640                 debug("single, tx: ");
 641
 642         if (mode & SPI_TX_QUAD)
 643                 debug("quad\n");
 644         else if (mode & SPI_TX_DUAL)
 645                 debug("dual\n");
 646         else
 647                 debug("single\n");
 648
 649         return 0;
 650 }
 651
 652 static const struct dm_spi_ops stm32_qspi_ops = {
 653         .claim_bus      = stm32_qspi_claim_bus,
 654         .release_bus    = stm32_qspi_release_bus,
 655         .xfer           = stm32_qspi_xfer,
 656         .set_speed      = stm32_qspi_set_speed,
 657         .set_mode       = stm32_qspi_set_mode,
 658 };
 659
 660 static const struct udevice_id stm32_qspi_ids[] = {
 661         { .compatible = "st,stm32-qspi" },
 662         { .compatible = "st,stm32f469-qspi" },
 663         { }
 664 };
 665
 666 U_BOOT_DRIVER(stm32_qspi) = {
 667         .name   = "stm32_qspi",
 668         .id     = UCLASS_SPI,
 669         .of_match = stm32_qspi_ids,
 670         .ops    = &stm32_qspi_ops,
 671         .ofdata_to_platdata = stm32_qspi_ofdata_to_platdata,
 672         .platdata_auto_alloc_size = sizeof(struct stm32_qspi_platdata),
 673         .priv_auto_alloc_size = sizeof(struct stm32_qspi_priv),
 674         .probe  = stm32_qspi_probe,
 675         .remove = stm32_qspi_remove,
 676 };