drivers/spi/atmel-quadspi.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Driver for Atmel QSPI Controller
   4  *
   5  * Copyright (C) 2015 Atmel Corporation
   6  * Copyright (C) 2018 Cryptera A/S
   7  *
   8  * Author: Cyrille Pitchen <[email protected]>
   9  * Author: Piotr Bugalski <[email protected]>
  10  *
  11  * This driver is based on drivers/mtd/spi-nor/fsl-quadspi.c from Freescale.
  12  */
  13
  14 #include <linux/clk.h>
  15 #include <linux/delay.h>
  16 #include <linux/err.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/io.h>
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/of.h>
  22 #include <linux/of_platform.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/pm_runtime.h>
  25 #include <linux/spi/spi-mem.h>
  26
  27 /* QSPI register offsets */
  28 #define QSPI_CR      0x0000  /* Control Register */
  29 #define QSPI_MR      0x0004  /* Mode Register */
  30 #define QSPI_RD      0x0008  /* Receive Data Register */
  31 #define QSPI_TD      0x000c  /* Transmit Data Register */
  32 #define QSPI_SR      0x0010  /* Status Register */
  33 #define QSPI_IER     0x0014  /* Interrupt Enable Register */
  34 #define QSPI_IDR     0x0018  /* Interrupt Disable Register */
  35 #define QSPI_IMR     0x001c  /* Interrupt Mask Register */
  36 #define QSPI_SCR     0x0020  /* Serial Clock Register */
  37
  38 #define QSPI_IAR     0x0030  /* Instruction Address Register */
  39 #define QSPI_ICR     0x0034  /* Instruction Code Register */
  40 #define QSPI_WICR    0x0034  /* Write Instruction Code Register */
  41 #define QSPI_IFR     0x0038  /* Instruction Frame Register */
  42 #define QSPI_RICR    0x003C  /* Read Instruction Code Register */
  43
  44 #define QSPI_SMR     0x0040  /* Scrambling Mode Register */
  45 #define QSPI_SKR     0x0044  /* Scrambling Key Register */
  46
  47 #define QSPI_WPMR    0x00E4  /* Write Protection Mode Register */
  48 #define QSPI_WPSR    0x00E8  /* Write Protection Status Register */
  49
  50 #define QSPI_VERSION 0x00FC  /* Version Register */
  51
  52
  53 /* Bitfields in QSPI_CR (Control Register) */
  54 #define QSPI_CR_QSPIEN                  BIT(0)
  55 #define QSPI_CR_QSPIDIS                 BIT(1)
  56 #define QSPI_CR_SWRST                   BIT(7)
  57 #define QSPI_CR_LASTXFER                BIT(24)
  58
  59 /* Bitfields in QSPI_MR (Mode Register) */
  60 #define QSPI_MR_SMM                     BIT(0)
  61 #define QSPI_MR_LLB                     BIT(1)
  62 #define QSPI_MR_WDRBT                   BIT(2)
  63 #define QSPI_MR_SMRM                    BIT(3)
  64 #define QSPI_MR_CSMODE_MASK             GENMASK(5, 4)
  65 #define QSPI_MR_CSMODE_NOT_RELOADED     (0 << 4)
  66 #define QSPI_MR_CSMODE_LASTXFER         (1 << 4)
  67 #define QSPI_MR_CSMODE_SYSTEMATICALLY   (2 << 4)
  68 #define QSPI_MR_NBBITS_MASK             GENMASK(11, 8)
  69 #define QSPI_MR_NBBITS(n)               ((((n) - 8) << 8) & QSPI_MR_NBBITS_MASK)
  70 #define QSPI_MR_DLYBCT_MASK             GENMASK(23, 16)
  71 #define QSPI_MR_DLYBCT(n)               (((n) << 16) & QSPI_MR_DLYBCT_MASK)
  72 #define QSPI_MR_DLYCS_MASK              GENMASK(31, 24)
  73 #define QSPI_MR_DLYCS(n)                (((n) << 24) & QSPI_MR_DLYCS_MASK)
  74
  75 /* Bitfields in QSPI_SR/QSPI_IER/QSPI_IDR/QSPI_IMR  */
  76 #define QSPI_SR_RDRF                    BIT(0)
  77 #define QSPI_SR_TDRE                    BIT(1)
  78 #define QSPI_SR_TXEMPTY                 BIT(2)
  79 #define QSPI_SR_OVRES                   BIT(3)
  80 #define QSPI_SR_CSR                     BIT(8)
  81 #define QSPI_SR_CSS                     BIT(9)
  82 #define QSPI_SR_INSTRE                  BIT(10)
  83 #define QSPI_SR_QSPIENS                 BIT(24)
  84
  85 #define QSPI_SR_CMD_COMPLETED   (QSPI_SR_INSTRE | QSPI_SR_CSR)
  86
  87 /* Bitfields in QSPI_SCR (Serial Clock Register) */
  88 #define QSPI_SCR_CPOL                   BIT(0)
  89 #define QSPI_SCR_CPHA                   BIT(1)
  90 #define QSPI_SCR_SCBR_MASK              GENMASK(15, 8)
  91 #define QSPI_SCR_SCBR(n)                (((n) << 8) & QSPI_SCR_SCBR_MASK)
  92 #define QSPI_SCR_DLYBS_MASK             GENMASK(23, 16)
  93 #define QSPI_SCR_DLYBS(n)               (((n) << 16) & QSPI_SCR_DLYBS_MASK)
  94
  95 /* Bitfields in QSPI_ICR (Read/Write Instruction Code Register) */
  96 #define QSPI_ICR_INST_MASK              GENMASK(7, 0)
  97 #define QSPI_ICR_INST(inst)             (((inst) << 0) & QSPI_ICR_INST_MASK)
  98 #define QSPI_ICR_OPT_MASK               GENMASK(23, 16)
  99 #define QSPI_ICR_OPT(opt)               (((opt) << 16) & QSPI_ICR_OPT_MASK)
 100
 101 /* Bitfields in QSPI_IFR (Instruction Frame Register) */
 102 #define QSPI_IFR_WIDTH_MASK             GENMASK(2, 0)
 103 #define QSPI_IFR_WIDTH_SINGLE_BIT_SPI   (0 << 0)
 104 #define QSPI_IFR_WIDTH_DUAL_OUTPUT      (1 << 0)
 105 #define QSPI_IFR_WIDTH_QUAD_OUTPUT      (2 << 0)
 106 #define QSPI_IFR_WIDTH_DUAL_IO          (3 << 0)
 107 #define QSPI_IFR_WIDTH_QUAD_IO          (4 << 0)
 108 #define QSPI_IFR_WIDTH_DUAL_CMD         (5 << 0)
 109 #define QSPI_IFR_WIDTH_QUAD_CMD         (6 << 0)
 110 #define QSPI_IFR_INSTEN                 BIT(4)
 111 #define QSPI_IFR_ADDREN                 BIT(5)
 112 #define QSPI_IFR_OPTEN                  BIT(6)
 113 #define QSPI_IFR_DATAEN                 BIT(7)
 114 #define QSPI_IFR_OPTL_MASK              GENMASK(9, 8)
 115 #define QSPI_IFR_OPTL_1BIT              (0 << 8)
 116 #define QSPI_IFR_OPTL_2BIT              (1 << 8)
 117 #define QSPI_IFR_OPTL_4BIT              (2 << 8)
 118 #define QSPI_IFR_OPTL_8BIT              (3 << 8)
 119 #define QSPI_IFR_ADDRL                  BIT(10)
 120 #define QSPI_IFR_TFRTYP_MEM             BIT(12)
 121 #define QSPI_IFR_SAMA5D2_WRITE_TRSFR    BIT(13)
 122 #define QSPI_IFR_CRM                    BIT(14)
 123 #define QSPI_IFR_NBDUM_MASK             GENMASK(20, 16)
 124 #define QSPI_IFR_NBDUM(n)               (((n) << 16) & QSPI_IFR_NBDUM_MASK)
 125 #define QSPI_IFR_APBTFRTYP_READ         BIT(24) /* Defined in SAM9X60 */
 126
 127 /* Bitfields in QSPI_SMR (Scrambling Mode Register) */
 128 #define QSPI_SMR_SCREN                  BIT(0)
 129 #define QSPI_SMR_RVDIS                  BIT(1)
 130
 131 /* Bitfields in QSPI_WPMR (Write Protection Mode Register) */
 132 #define QSPI_WPMR_WPEN                  BIT(0)
 133 #define QSPI_WPMR_WPKEY_MASK            GENMASK(31, 8)
 134 #define QSPI_WPMR_WPKEY(wpkey)          (((wpkey) << 8) & QSPI_WPMR_WPKEY_MASK)
 135
 136 /* Bitfields in QSPI_WPSR (Write Protection Status Register) */
 137 #define QSPI_WPSR_WPVS                  BIT(0)
 138 #define QSPI_WPSR_WPVSRC_MASK           GENMASK(15, 8)
 139 #define QSPI_WPSR_WPVSRC(src)           (((src) << 8) & QSPI_WPSR_WPVSRC)
 140
 141 struct atmel_qspi_caps {
 142         bool has_qspick;
 143         bool has_ricr;
 144 };
 145
 146 struct atmel_qspi {
 147         void __iomem            *regs;
 148         void __iomem            *mem;
 149         struct clk              *pclk;
 150         struct clk              *qspick;
 151         struct platform_device  *pdev;
 152         const struct atmel_qspi_caps *caps;
 153         resource_size_t         mmap_size;
 154         u32                     pending;
 155         u32                     mr;
 156         u32                     scr;
 157         struct completion       cmd_completion;
 158 };
 159
 160 struct atmel_qspi_mode {
 161         u8 cmd_buswidth;
 162         u8 addr_buswidth;
 163         u8 data_buswidth;
 164         u32 config;
 165 };
 166
 167 static const struct atmel_qspi_mode atmel_qspi_modes[] = {
 168         { 1, 1, 1, QSPI_IFR_WIDTH_SINGLE_BIT_SPI },
 169         { 1, 1, 2, QSPI_IFR_WIDTH_DUAL_OUTPUT },
 170         { 1, 1, 4, QSPI_IFR_WIDTH_QUAD_OUTPUT },
 171         { 1, 2, 2, QSPI_IFR_WIDTH_DUAL_IO },
 172         { 1, 4, 4, QSPI_IFR_WIDTH_QUAD_IO },
 173         { 2, 2, 2, QSPI_IFR_WIDTH_DUAL_CMD },
 174         { 4, 4, 4, QSPI_IFR_WIDTH_QUAD_CMD },
 175 };
 176
 177 #ifdef VERBOSE_DEBUG
 178 static const char *atmel_qspi_reg_name(u32 offset, char *tmp, size_t sz)
 179 {
 180         switch (offset) {
 181         case QSPI_CR:
 182                 return "CR";
 183         case QSPI_MR:
 184                 return "MR";
 185         case QSPI_RD:
 186                 return "RD";
 187         case QSPI_TD:
 188                 return "TD";
 189         case QSPI_SR:
 190                 return "SR";
 191         case QSPI_IER:
 192                 return "IER";
 193         case QSPI_IDR:
 194                 return "IDR";
 195         case QSPI_IMR:
 196                 return "IMR";
 197         case QSPI_SCR:
 198                 return "SCR";
 199         case QSPI_IAR:
 200                 return "IAR";
 201         case QSPI_ICR:
 202                 return "ICR/WICR";
 203         case QSPI_IFR:
 204                 return "IFR";
 205         case QSPI_RICR:
 206                 return "RICR";
 207         case QSPI_SMR:
 208                 return "SMR";
 209         case QSPI_SKR:
 210                 return "SKR";
 211         case QSPI_WPMR:
 212                 return "WPMR";
 213         case QSPI_WPSR:
 214                 return "WPSR";
 215         case QSPI_VERSION:
 216                 return "VERSION";
 217         default:
 218                 snprintf(tmp, sz, "0x%02x", offset);
 219                 break;
 220         }
 221
 222         return tmp;
 223 }
 224 #endif /* VERBOSE_DEBUG */
 225
 226 static u32 atmel_qspi_read(struct atmel_qspi *aq, u32 offset)
 227 {
 228         u32 value = readl_relaxed(aq->regs + offset);
 229
 230 #ifdef VERBOSE_DEBUG
 231         char tmp[8];
 232
 233         dev_vdbg(&aq->pdev->dev, "read 0x%08x from %s\n", value,
 234                  atmel_qspi_reg_name(offset, tmp, sizeof(tmp)));
 235 #endif /* VERBOSE_DEBUG */
 236
 237         return value;
 238 }
 239
 240 static void atmel_qspi_write(u32 value, struct atmel_qspi *aq, u32 offset)
 241 {
 242 #ifdef VERBOSE_DEBUG
 243         char tmp[8];
 244
 245         dev_vdbg(&aq->pdev->dev, "write 0x%08x into %s\n", value,
 246                  atmel_qspi_reg_name(offset, tmp, sizeof(tmp)));
 247 #endif /* VERBOSE_DEBUG */
 248
 249         writel_relaxed(value, aq->regs + offset);
 250 }
 251
 252 static inline bool atmel_qspi_is_compatible(const struct spi_mem_op *op,
 253                                             const struct atmel_qspi_mode *mode)
 254 {
 255         if (op->cmd.buswidth != mode->cmd_buswidth)
 256                 return false;
 257
 258         if (op->addr.nbytes && op->addr.buswidth != mode->addr_buswidth)
 259                 return false;
 260
 261         if (op->data.nbytes && op->data.buswidth != mode->data_buswidth)
 262                 return false;
 263
 264         return true;
 265 }
 266
 267 static int atmel_qspi_find_mode(const struct spi_mem_op *op)
 268 {
 269         u32 i;
 270
 271         for (i = 0; i < ARRAY_SIZE(atmel_qspi_modes); i++)
 272                 if (atmel_qspi_is_compatible(op, &atmel_qspi_modes[i]))
 273                         return i;
 274
 275         return -EOPNOTSUPP;
 276 }
 277
 278 static bool atmel_qspi_supports_op(struct spi_mem *mem,
 279                                    const struct spi_mem_op *op)
 280 {
 281         if (!spi_mem_default_supports_op(mem, op))
 282                 return false;
 283
 284         if (atmel_qspi_find_mode(op) < 0)
 285                 return false;
 286
 287         /* special case not supported by hardware */
 288         if (op->addr.nbytes == 2 && op->cmd.buswidth != op->addr.buswidth &&
 289             op->dummy.nbytes == 0)
 290                 return false;
 291
 292         return true;
 293 }
 294
 295 static int atmel_qspi_set_cfg(struct atmel_qspi *aq,
 296                               const struct spi_mem_op *op, u32 *offset)
 297 {
 298         u32 iar, icr, ifr;
 299         u32 dummy_cycles = 0;
 300         int mode;
 301
 302         iar = 0;
 303         icr = QSPI_ICR_INST(op->cmd.opcode);
 304         ifr = QSPI_IFR_INSTEN;
 305
 306         mode = atmel_qspi_find_mode(op);
 307         if (mode < 0)
 308                 return mode;
 309         ifr |= atmel_qspi_modes[mode].config;
 310
 311         if (op->dummy.nbytes)
 312                 dummy_cycles = op->dummy.nbytes * 8 / op->dummy.buswidth;
 313
 314         /*
 315          * The controller allows 24 and 32-bit addressing while NAND-flash
 316          * requires 16-bit long. Handling 8-bit long addresses is done using
 317          * the option field. For the 16-bit addresses, the workaround depends
 318          * of the number of requested dummy bits. If there are 8 or more dummy
 319          * cycles, the address is shifted and sent with the first dummy byte.
 320          * Otherwise opcode is disabled and the first byte of the address
 321          * contains the command opcode (works only if the opcode and address
 322          * use the same buswidth). The limitation is when the 16-bit address is
 323          * used without enough dummy cycles and the opcode is using a different
 324          * buswidth than the address.
 325          */
 326         if (op->addr.buswidth) {
 327                 switch (op->addr.nbytes) {
 328                 case 0:
 329                         break;
 330                 case 1:
 331                         ifr |= QSPI_IFR_OPTEN | QSPI_IFR_OPTL_8BIT;
 332                         icr |= QSPI_ICR_OPT(op->addr.val & 0xff);
 333                         break;
 334                 case 2:
 335                         if (dummy_cycles < 8 / op->addr.buswidth) {
 336                                 ifr &= ~QSPI_IFR_INSTEN;
 337                                 ifr |= QSPI_IFR_ADDREN;
 338                                 iar = (op->cmd.opcode << 16) |
 339                                         (op->addr.val & 0xffff);
 340                         } else {
 341                                 ifr |= QSPI_IFR_ADDREN;
 342                                 iar = (op->addr.val << 8) & 0xffffff;
 343                                 dummy_cycles -= 8 / op->addr.buswidth;
 344                         }
 345                         break;
 346                 case 3:
 347                         ifr |= QSPI_IFR_ADDREN;
 348                         iar = op->addr.val & 0xffffff;
 349                         break;
 350                 case 4:
 351                         ifr |= QSPI_IFR_ADDREN | QSPI_IFR_ADDRL;
 352                         iar = op->addr.val & 0x7ffffff;
 353                         break;
 354                 default:
 355                         return -ENOTSUPP;
 356                 }
 357         }
 358
 359         /* offset of the data access in the QSPI memory space */
 360         *offset = iar;
 361
 362         /* Set number of dummy cycles */
 363         if (dummy_cycles)
 364                 ifr |= QSPI_IFR_NBDUM(dummy_cycles);
 365
 366         /* Set data enable and data transfer type. */
 367         if (op->data.nbytes) {
 368                 ifr |= QSPI_IFR_DATAEN;
 369
 370                 if (op->addr.nbytes)
 371                         ifr |= QSPI_IFR_TFRTYP_MEM;
 372         }
 373
 374         /*
 375          * If the QSPI controller is set in regular SPI mode, set it in
 376          * Serial Memory Mode (SMM).
 377          */
 378         if (!(aq->mr & QSPI_MR_SMM)) {
 379                 aq->mr |= QSPI_MR_SMM;
 380                 atmel_qspi_write(aq->mr, aq, QSPI_MR);
 381         }
 382
 383         /* Clear pending interrupts */
 384         (void)atmel_qspi_read(aq, QSPI_SR);
 385
 386         /* Set QSPI Instruction Frame registers. */
 387         if (op->addr.nbytes && !op->data.nbytes)
 388                 atmel_qspi_write(iar, aq, QSPI_IAR);
 389
 390         if (aq->caps->has_ricr) {
 391                 if (op->data.dir == SPI_MEM_DATA_IN)
 392                         atmel_qspi_write(icr, aq, QSPI_RICR);
 393                 else
 394                         atmel_qspi_write(icr, aq, QSPI_WICR);
 395         } else {
 396                 if (op->data.nbytes && op->data.dir == SPI_MEM_DATA_OUT)
 397                         ifr |= QSPI_IFR_SAMA5D2_WRITE_TRSFR;
 398
 399                 atmel_qspi_write(icr, aq, QSPI_ICR);
 400         }
 401
 402         atmel_qspi_write(ifr, aq, QSPI_IFR);
 403
 404         return 0;
 405 }
 406
 407 static int atmel_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
 408 {
 409         struct atmel_qspi *aq = spi_controller_get_devdata(mem->spi->controller);
 410         u32 sr, offset;
 411         int err;
 412
 413         /*
 414          * Check if the address exceeds the MMIO window size. An improvement
 415          * would be to add support for regular SPI mode and fall back to it
 416          * when the flash memories overrun the controller's memory space.
 417          */
 418         if (op->addr.val + op->data.nbytes > aq->mmap_size)
 419                 return -ENOTSUPP;
 420
 421         err = pm_runtime_resume_and_get(&aq->pdev->dev);
 422         if (err < 0)
 423                 return err;
 424
 425         err = atmel_qspi_set_cfg(aq, op, &offset);
 426         if (err)
 427                 goto pm_runtime_put;
 428
 429         /* Skip to the final steps if there is no data */
 430         if (op->data.nbytes) {
 431                 /* Dummy read of QSPI_IFR to synchronize APB and AHB accesses */
 432                 (void)atmel_qspi_read(aq, QSPI_IFR);
 433
 434                 /* Send/Receive data */
 435                 if (op->data.dir == SPI_MEM_DATA_IN)
 436                         memcpy_fromio(op->data.buf.in, aq->mem + offset,
 437                                       op->data.nbytes);
 438                 else
 439                         memcpy_toio(aq->mem + offset, op->data.buf.out,
 440                                     op->data.nbytes);
 441
 442                 /* Release the chip-select */
 443                 atmel_qspi_write(QSPI_CR_LASTXFER, aq, QSPI_CR);
 444         }
 445
 446         /* Poll INSTRuction End status */
 447         sr = atmel_qspi_read(aq, QSPI_SR);
 448         if ((sr & QSPI_SR_CMD_COMPLETED) == QSPI_SR_CMD_COMPLETED)
 449                 goto pm_runtime_put;
 450
 451         /* Wait for INSTRuction End interrupt */
 452         reinit_completion(&aq->cmd_completion);
 453         aq->pending = sr & QSPI_SR_CMD_COMPLETED;
 454         atmel_qspi_write(QSPI_SR_CMD_COMPLETED, aq, QSPI_IER);
 455         if (!wait_for_completion_timeout(&aq->cmd_completion,
 456                                          msecs_to_jiffies(1000)))
 457                 err = -ETIMEDOUT;
 458         atmel_qspi_write(QSPI_SR_CMD_COMPLETED, aq, QSPI_IDR);
 459
 460 pm_runtime_put:
 461         pm_runtime_mark_last_busy(&aq->pdev->dev);
 462         pm_runtime_put_autosuspend(&aq->pdev->dev);
 463         return err;
 464 }
 465
 466 static const char *atmel_qspi_get_name(struct spi_mem *spimem)
 467 {
 468         return dev_name(spimem->spi->dev.parent);
 469 }
 470
 471 static const struct spi_controller_mem_ops atmel_qspi_mem_ops = {
 472         .supports_op = atmel_qspi_supports_op,
 473         .exec_op = atmel_qspi_exec_op,
 474         .get_name = atmel_qspi_get_name
 475 };
 476
 477 static int atmel_qspi_setup(struct spi_device *spi)
 478 {
 479         struct spi_controller *ctrl = spi->controller;
 480         struct atmel_qspi *aq = spi_controller_get_devdata(ctrl);
 481         unsigned long src_rate;
 482         u32 scbr;
 483         int ret;
 484
 485         if (ctrl->busy)
 486                 return -EBUSY;
 487
 488         if (!spi->max_speed_hz)
 489                 return -EINVAL;
 490
 491         src_rate = clk_get_rate(aq->pclk);
 492         if (!src_rate)
 493                 return -EINVAL;
 494
 495         /* Compute the QSPI baudrate */
 496         scbr = DIV_ROUND_UP(src_rate, spi->max_speed_hz);
 497         if (scbr > 0)
 498                 scbr--;
 499
 500         ret = pm_runtime_resume_and_get(ctrl->dev.parent);
 501         if (ret < 0)
 502                 return ret;
 503
 504         aq->scr &= ~QSPI_SCR_SCBR_MASK;
 505         aq->scr |= QSPI_SCR_SCBR(scbr);
 506         atmel_qspi_write(aq->scr, aq, QSPI_SCR);
 507
 508         pm_runtime_mark_last_busy(ctrl->dev.parent);
 509         pm_runtime_put_autosuspend(ctrl->dev.parent);
 510
 511         return 0;
 512 }
 513
 514 static int atmel_qspi_set_cs_timing(struct spi_device *spi)
 515 {
 516         struct spi_controller *ctrl = spi->controller;
 517         struct atmel_qspi *aq = spi_controller_get_devdata(ctrl);
 518         unsigned long clk_rate;
 519         u32 cs_inactive;
 520         u32 cs_setup;
 521         u32 cs_hold;
 522         int delay;
 523         int ret;
 524
 525         clk_rate = clk_get_rate(aq->pclk);
 526         if (!clk_rate)
 527                 return -EINVAL;
 528
 529         /* hold */
 530         delay = spi_delay_to_ns(&spi->cs_hold, NULL);
 531         if (aq->mr & QSPI_MR_SMM) {
 532                 if (delay > 0)
 533                         dev_warn(&aq->pdev->dev,
 534                                  "Ignoring cs_hold, must be 0 in Serial Memory Mode.\n");
 535                 cs_hold = 0;
 536         } else {
 537                 delay = spi_delay_to_ns(&spi->cs_hold, NULL);
 538                 if (delay < 0)
 539                         return delay;
 540
 541                 cs_hold = DIV_ROUND_UP((delay * DIV_ROUND_UP(clk_rate, 1000000)), 32000);
 542         }
 543
 544         /* setup */
 545         delay = spi_delay_to_ns(&spi->cs_setup, NULL);
 546         if (delay < 0)
 547                 return delay;
 548
 549         cs_setup = DIV_ROUND_UP((delay * DIV_ROUND_UP(clk_rate, 1000000)),
 550                                 1000);
 551
 552         /* inactive */
 553         delay = spi_delay_to_ns(&spi->cs_inactive, NULL);
 554         if (delay < 0)
 555                 return delay;
 556         cs_inactive = DIV_ROUND_UP((delay * DIV_ROUND_UP(clk_rate, 1000000)), 1000);
 557
 558         ret = pm_runtime_resume_and_get(ctrl->dev.parent);
 559         if (ret < 0)
 560                 return ret;
 561
 562         aq->scr &= ~QSPI_SCR_DLYBS_MASK;
 563         aq->scr |= QSPI_SCR_DLYBS(cs_setup);
 564         atmel_qspi_write(aq->scr, aq, QSPI_SCR);
 565
 566         aq->mr &= ~(QSPI_MR_DLYBCT_MASK | QSPI_MR_DLYCS_MASK);
 567         aq->mr |= QSPI_MR_DLYBCT(cs_hold) | QSPI_MR_DLYCS(cs_inactive);
 568         atmel_qspi_write(aq->mr, aq, QSPI_MR);
 569
 570         pm_runtime_mark_last_busy(ctrl->dev.parent);
 571         pm_runtime_put_autosuspend(ctrl->dev.parent);
 572
 573         return 0;
 574 }
 575
 576 static void atmel_qspi_init(struct atmel_qspi *aq)
 577 {
 578         /* Reset the QSPI controller */
 579         atmel_qspi_write(QSPI_CR_SWRST, aq, QSPI_CR);
 580
 581         /* Set the QSPI controller by default in Serial Memory Mode */
 582         aq->mr |= QSPI_MR_SMM;
 583         atmel_qspi_write(aq->mr, aq, QSPI_MR);
 584
 585         /* Enable the QSPI controller */
 586         atmel_qspi_write(QSPI_CR_QSPIEN, aq, QSPI_CR);
 587 }
 588
 589 static irqreturn_t atmel_qspi_interrupt(int irq, void *dev_id)
 590 {
 591         struct atmel_qspi *aq = dev_id;
 592         u32 status, mask, pending;
 593
 594         status = atmel_qspi_read(aq, QSPI_SR);
 595         mask = atmel_qspi_read(aq, QSPI_IMR);
 596         pending = status & mask;
 597
 598         if (!pending)
 599                 return IRQ_NONE;
 600
 601         aq->pending |= pending;
 602         if ((aq->pending & QSPI_SR_CMD_COMPLETED) == QSPI_SR_CMD_COMPLETED)
 603                 complete(&aq->cmd_completion);
 604
 605         return IRQ_HANDLED;
 606 }
 607
 608 static int atmel_qspi_probe(struct platform_device *pdev)
 609 {
 610         struct spi_controller *ctrl;
 611         struct atmel_qspi *aq;
 612         struct resource *res;
 613         int irq, err = 0;
 614
 615         ctrl = devm_spi_alloc_host(&pdev->dev, sizeof(*aq));
 616         if (!ctrl)
 617                 return -ENOMEM;
 618
 619         ctrl->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD | SPI_TX_DUAL | SPI_TX_QUAD;
 620         ctrl->setup = atmel_qspi_setup;
 621         ctrl->set_cs_timing = atmel_qspi_set_cs_timing;
 622         ctrl->bus_num = -1;
 623         ctrl->mem_ops = &atmel_qspi_mem_ops;
 624         ctrl->num_chipselect = 1;
 625         ctrl->dev.of_node = pdev->dev.of_node;
 626         platform_set_drvdata(pdev, ctrl);
 627
 628         aq = spi_controller_get_devdata(ctrl);
 629
 630         init_completion(&aq->cmd_completion);
 631         aq->pdev = pdev;
 632
 633         /* Map the registers */
 634         aq->regs = devm_platform_ioremap_resource_byname(pdev, "qspi_base");
 635         if (IS_ERR(aq->regs))
 636                 return dev_err_probe(&pdev->dev, PTR_ERR(aq->regs),
 637                                      "missing registers\n");
 638
 639         /* Map the AHB memory */
 640         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qspi_mmap");
 641         aq->mem = devm_ioremap_resource(&pdev->dev, res);
 642         if (IS_ERR(aq->mem))
 643                 return dev_err_probe(&pdev->dev, PTR_ERR(aq->mem),
 644                                      "missing AHB memory\n");
 645
 646         aq->mmap_size = resource_size(res);
 647
 648         /* Get the peripheral clock */
 649         aq->pclk = devm_clk_get(&pdev->dev, "pclk");
 650         if (IS_ERR(aq->pclk))
 651                 aq->pclk = devm_clk_get(&pdev->dev, NULL);
 652
 653         if (IS_ERR(aq->pclk))
 654                 return dev_err_probe(&pdev->dev, PTR_ERR(aq->pclk),
 655                                      "missing peripheral clock\n");
 656
 657         /* Enable the peripheral clock */
 658         err = clk_prepare_enable(aq->pclk);
 659         if (err)
 660                 return dev_err_probe(&pdev->dev, err,
 661                                      "failed to enable the peripheral clock\n");
 662
 663         aq->caps = of_device_get_match_data(&pdev->dev);
 664         if (!aq->caps) {
 665                 dev_err(&pdev->dev, "Could not retrieve QSPI caps\n");
 666                 err = -EINVAL;
 667                 goto disable_pclk;
 668         }
 669
 670         if (aq->caps->has_qspick) {
 671                 /* Get the QSPI system clock */
 672                 aq->qspick = devm_clk_get(&pdev->dev, "qspick");
 673                 if (IS_ERR(aq->qspick)) {
 674                         dev_err(&pdev->dev, "missing system clock\n");
 675                         err = PTR_ERR(aq->qspick);
 676                         goto disable_pclk;
 677                 }
 678
 679                 /* Enable the QSPI system clock */
 680                 err = clk_prepare_enable(aq->qspick);
 681                 if (err) {
 682                         dev_err(&pdev->dev,
 683                                 "failed to enable the QSPI system clock\n");
 684                         goto disable_pclk;
 685                 }
 686         }
 687
 688         /* Request the IRQ */
 689         irq = platform_get_irq(pdev, 0);
 690         if (irq < 0) {
 691                 err = irq;
 692                 goto disable_qspick;
 693         }
 694         err = devm_request_irq(&pdev->dev, irq, atmel_qspi_interrupt,
 695                                0, dev_name(&pdev->dev), aq);
 696         if (err)
 697                 goto disable_qspick;
 698
 699         pm_runtime_set_autosuspend_delay(&pdev->dev, 500);
 700         pm_runtime_use_autosuspend(&pdev->dev);
 701         pm_runtime_set_active(&pdev->dev);
 702         pm_runtime_enable(&pdev->dev);
 703         pm_runtime_get_noresume(&pdev->dev);
 704
 705         atmel_qspi_init(aq);
 706
 707         err = spi_register_controller(ctrl);
 708         if (err) {
 709                 pm_runtime_put_noidle(&pdev->dev);
 710                 pm_runtime_disable(&pdev->dev);
 711                 pm_runtime_set_suspended(&pdev->dev);
 712                 pm_runtime_dont_use_autosuspend(&pdev->dev);
 713                 goto disable_qspick;
 714         }
 715         pm_runtime_mark_last_busy(&pdev->dev);
 716         pm_runtime_put_autosuspend(&pdev->dev);
 717
 718         return 0;
 719
 720 disable_qspick:
 721         clk_disable_unprepare(aq->qspick);
 722 disable_pclk:
 723         clk_disable_unprepare(aq->pclk);
 724
 725         return err;
 726 }
 727
 728 static void atmel_qspi_remove(struct platform_device *pdev)
 729 {
 730         struct spi_controller *ctrl = platform_get_drvdata(pdev);
 731         struct atmel_qspi *aq = spi_controller_get_devdata(ctrl);
 732         int ret;
 733
 734         spi_unregister_controller(ctrl);
 735
 736         ret = pm_runtime_get_sync(&pdev->dev);
 737         if (ret >= 0) {
 738                 atmel_qspi_write(QSPI_CR_QSPIDIS, aq, QSPI_CR);
 739                 clk_disable(aq->qspick);
 740                 clk_disable(aq->pclk);
 741         } else {
 742                 /*
 743                  * atmel_qspi_runtime_{suspend,resume} just disable and enable
 744                  * the two clks respectively. So after resume failed these are
 745                  * off, and we skip hardware access and disabling these clks again.
 746                  */
 747                 dev_warn(&pdev->dev, "Failed to resume device on remove\n");
 748         }
 749
 750         clk_unprepare(aq->qspick);
 751         clk_unprepare(aq->pclk);
 752
 753         pm_runtime_disable(&pdev->dev);
 754         pm_runtime_dont_use_autosuspend(&pdev->dev);
 755         pm_runtime_put_noidle(&pdev->dev);
 756 }
 757
 758 static int __maybe_unused atmel_qspi_suspend(struct device *dev)
 759 {
 760         struct spi_controller *ctrl = dev_get_drvdata(dev);
 761         struct atmel_qspi *aq = spi_controller_get_devdata(ctrl);
 762         int ret;
 763
 764         ret = pm_runtime_resume_and_get(dev);
 765         if (ret < 0)
 766                 return ret;
 767
 768         atmel_qspi_write(QSPI_CR_QSPIDIS, aq, QSPI_CR);
 769
 770         pm_runtime_mark_last_busy(dev);
 771         pm_runtime_force_suspend(dev);
 772
 773         clk_unprepare(aq->qspick);
 774         clk_unprepare(aq->pclk);
 775
 776         return 0;
 777 }
 778
 779 static int __maybe_unused atmel_qspi_resume(struct device *dev)
 780 {
 781         struct spi_controller *ctrl = dev_get_drvdata(dev);
 782         struct atmel_qspi *aq = spi_controller_get_devdata(ctrl);
 783         int ret;
 784
 785         ret = clk_prepare(aq->pclk);
 786         if (ret)
 787                 return ret;
 788
 789         ret = clk_prepare(aq->qspick);
 790         if (ret) {
 791                 clk_unprepare(aq->pclk);
 792                 return ret;
 793         }
 794
 795         ret = pm_runtime_force_resume(dev);
 796         if (ret < 0)
 797                 return ret;
 798
 799         atmel_qspi_init(aq);
 800
 801         atmel_qspi_write(aq->scr, aq, QSPI_SCR);
 802
 803         pm_runtime_mark_last_busy(dev);
 804         pm_runtime_put_autosuspend(dev);
 805
 806         return 0;
 807 }
 808
 809 static int __maybe_unused atmel_qspi_runtime_suspend(struct device *dev)
 810 {
 811         struct spi_controller *ctrl = dev_get_drvdata(dev);
 812         struct atmel_qspi *aq = spi_controller_get_devdata(ctrl);
 813
 814         clk_disable(aq->qspick);
 815         clk_disable(aq->pclk);
 816
 817         return 0;
 818 }
 819
 820 static int __maybe_unused atmel_qspi_runtime_resume(struct device *dev)
 821 {
 822         struct spi_controller *ctrl = dev_get_drvdata(dev);
 823         struct atmel_qspi *aq = spi_controller_get_devdata(ctrl);
 824         int ret;
 825
 826         ret = clk_enable(aq->pclk);
 827         if (ret)
 828                 return ret;
 829
 830         ret = clk_enable(aq->qspick);
 831         if (ret)
 832                 clk_disable(aq->pclk);
 833
 834         return ret;
 835 }
 836
 837 static const struct dev_pm_ops __maybe_unused atmel_qspi_pm_ops = {
 838         SET_SYSTEM_SLEEP_PM_OPS(atmel_qspi_suspend, atmel_qspi_resume)
 839         SET_RUNTIME_PM_OPS(atmel_qspi_runtime_suspend,
 840                            atmel_qspi_runtime_resume, NULL)
 841 };
 842
 843 static const struct atmel_qspi_caps atmel_sama5d2_qspi_caps = {};
 844
 845 static const struct atmel_qspi_caps atmel_sam9x60_qspi_caps = {
 846         .has_qspick = true,
 847         .has_ricr = true,
 848 };
 849
 850 static const struct of_device_id atmel_qspi_dt_ids[] = {
 851         {
 852                 .compatible = "atmel,sama5d2-qspi",
 853                 .data = &atmel_sama5d2_qspi_caps,
 854         },
 855         {
 856                 .compatible = "microchip,sam9x60-qspi",
 857                 .data = &atmel_sam9x60_qspi_caps,
 858         },
 859         { /* sentinel */ }
 860 };
 861
 862 MODULE_DEVICE_TABLE(of, atmel_qspi_dt_ids);
 863
 864 static struct platform_driver atmel_qspi_driver = {
 865         .driver = {
 866                 .name   = "atmel_qspi",
 867                 .of_match_table = atmel_qspi_dt_ids,
 868                 .pm     = pm_ptr(&atmel_qspi_pm_ops),
 869         },
 870         .probe          = atmel_qspi_probe,
 871         .remove         = atmel_qspi_remove,
 872 };
 873 module_platform_driver(atmel_qspi_driver);
 874
 875 MODULE_AUTHOR("Cyrille Pitchen <[email protected]>");
 876 MODULE_AUTHOR("Piotr Bugalski <[email protected]");
 877 MODULE_DESCRIPTION("Atmel QSPI Controller driver");
 878 MODULE_LICENSE("GPL v2");