drivers/spi/zynqmp_gqspi.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2018 Xilinx
   4  *
   5  * Xilinx ZynqMP Generic Quad-SPI(QSPI) controller driver(master mode only)
   6  */
   7
   8 #include <common.h>
   9 #include <cpu_func.h>
  10 #include <log.h>
  11 #include <asm/arch/sys_proto.h>
  12 #include <asm/cache.h>
  13 #include <asm/io.h>
  14 #include <clk.h>
  15 #include <dm.h>
  16 #include <malloc.h>
  17 #include <memalign.h>
  18 #include <spi.h>
  19 #include <spi-mem.h>
  20 #include <ubi_uboot.h>
  21 #include <wait_bit.h>
  22 #include <dm/device_compat.h>
  23 #include <linux/bitops.h>
  24 #include <linux/err.h>
  25 #include <linux/sizes.h>
  26 #include <zynqmp_firmware.h>
  27
  28 #define GQSPI_GFIFO_STRT_MODE_MASK      BIT(29)
  29 #define GQSPI_CONFIG_MODE_EN_MASK       (3 << 30)
  30 #define GQSPI_CONFIG_DMA_MODE           (2 << 30)
  31 #define GQSPI_CONFIG_CPHA_MASK          BIT(2)
  32 #define GQSPI_CONFIG_CPOL_MASK          BIT(1)
  33
  34 /*
  35  * QSPI Interrupt Registers bit Masks
  36  *
  37  * All the four interrupt registers (Status/Mask/Enable/Disable) have the same
  38  * bit definitions.
  39  */
  40 #define GQSPI_IXR_TXNFULL_MASK          0x00000004 /* QSPI TX FIFO Overflow */
  41 #define GQSPI_IXR_TXFULL_MASK           0x00000008 /* QSPI TX FIFO is full */
  42 #define GQSPI_IXR_TXFIFOEMPTY_MASK      0x00000100 /* QSPI TX FIFO is Empty */
  43 #define GQSPI_IXR_RXNEMTY_MASK          0x00000010 /* QSPI RX FIFO Not Empty */
  44 #define GQSPI_IXR_GFEMTY_MASK           0x00000080 /* QSPI Generic FIFO Empty */
  45 #define GQSPI_IXR_GFNFULL_MASK          0x00000200 /* QSPI GENFIFO not full */
  46 #define GQSPI_IXR_ALL_MASK              (GQSPI_IXR_TXNFULL_MASK | \
  47                                          GQSPI_IXR_RXNEMTY_MASK)
  48
  49 /*
  50  * QSPI Enable Register bit Masks
  51  *
  52  * This register is used to enable or disable the QSPI controller
  53  */
  54 #define GQSPI_ENABLE_ENABLE_MASK        0x00000001 /* QSPI Enable Bit Mask */
  55
  56 #define GQSPI_GFIFO_LOW_BUS             BIT(14)
  57 #define GQSPI_GFIFO_CS_LOWER            BIT(12)
  58 #define GQSPI_GFIFO_UP_BUS              BIT(15)
  59 #define GQSPI_GFIFO_CS_UPPER            BIT(13)
  60 #define GQSPI_SPI_MODE_QSPI             (3 << 10)
  61 #define GQSPI_SPI_MODE_SPI              BIT(10)
  62 #define GQSPI_SPI_MODE_DUAL_SPI         (2 << 10)
  63 #define GQSPI_IMD_DATA_CS_ASSERT        5
  64 #define GQSPI_IMD_DATA_CS_DEASSERT      5
  65 #define GQSPI_GFIFO_TX                  BIT(16)
  66 #define GQSPI_GFIFO_RX                  BIT(17)
  67 #define GQSPI_GFIFO_STRIPE_MASK         BIT(18)
  68 #define GQSPI_GFIFO_IMD_MASK            0xFF
  69 #define GQSPI_GFIFO_EXP_MASK            BIT(9)
  70 #define GQSPI_GFIFO_DATA_XFR_MASK       BIT(8)
  71 #define GQSPI_STRT_GEN_FIFO             BIT(28)
  72 #define GQSPI_GEN_FIFO_STRT_MOD         BIT(29)
  73 #define GQSPI_GFIFO_WP_HOLD             BIT(19)
  74 #define GQSPI_BAUD_DIV_MASK             (7 << 3)
  75 #define GQSPI_DFLT_BAUD_RATE_DIV        BIT(3)
  76 #define GQSPI_GFIFO_ALL_INT_MASK        0xFBE
  77 #define GQSPI_DMA_DST_I_STS_DONE        BIT(1)
  78 #define GQSPI_DMA_DST_I_STS_MASK        0xFE
  79 #define MODEBITS                        0x6
  80
  81 #define GQSPI_GFIFO_SELECT              BIT(0)
  82 #define GQSPI_FIFO_THRESHOLD            1
  83 #define GQSPI_GENFIFO_THRESHOLD         31
  84
  85 #define SPI_XFER_ON_BOTH                0
  86 #define SPI_XFER_ON_LOWER               1
  87 #define SPI_XFER_ON_UPPER               2
  88
  89 #define GQSPI_DMA_ALIGN                 0x4
  90 #define GQSPI_MAX_BAUD_RATE_VAL         7
  91 #define GQSPI_DFLT_BAUD_RATE_VAL        2
  92
  93 #define GQSPI_TIMEOUT                   100000000
  94
  95 #define GQSPI_BAUD_DIV_SHIFT            2
  96 #define GQSPI_LPBK_DLY_ADJ_LPBK_SHIFT   5
  97 #define GQSPI_LPBK_DLY_ADJ_DLY_1        0x2
  98 #define GQSPI_LPBK_DLY_ADJ_DLY_1_SHIFT  3
  99 #define GQSPI_LPBK_DLY_ADJ_DLY_0        0x3
 100 #define GQSPI_USE_DATA_DLY              0x1
 101 #define GQSPI_USE_DATA_DLY_SHIFT        31
 102 #define GQSPI_DATA_DLY_ADJ_VALUE        0x2
 103 #define GQSPI_DATA_DLY_ADJ_SHIFT        28
 104 #define TAP_DLY_BYPASS_LQSPI_RX_VALUE   0x1
 105 #define TAP_DLY_BYPASS_LQSPI_RX_SHIFT   2
 106 #define GQSPI_DATA_DLY_ADJ_OFST         0x000001F8
 107 #define IOU_TAPDLY_BYPASS_OFST !IS_ENABLED(CONFIG_ARCH_VERSAL) ? \
 108                                 0xFF180390 : 0xF103003C
 109 #define GQSPI_LPBK_DLY_ADJ_LPBK_MASK    0x00000020
 110 #define GQSPI_FREQ_37_5MHZ              37500000
 111 #define GQSPI_FREQ_40MHZ                40000000
 112 #define GQSPI_FREQ_100MHZ               100000000
 113 #define GQSPI_FREQ_150MHZ               150000000
 114 #define IOU_TAPDLY_BYPASS_MASK          0x7
 115
 116 #define GQSPI_REG_OFFSET                0x100
 117 #define GQSPI_DMA_REG_OFFSET            0x800
 118
 119 /* QSPI register offsets */
 120 struct zynqmp_qspi_regs {
 121         u32 confr;      /* 0x00 */
 122         u32 isr;        /* 0x04 */
 123         u32 ier;        /* 0x08 */
 124         u32 idisr;      /* 0x0C */
 125         u32 imaskr;     /* 0x10 */
 126         u32 enbr;       /* 0x14 */
 127         u32 dr;         /* 0x18 */
 128         u32 txd0r;      /* 0x1C */
 129         u32 drxr;       /* 0x20 */
 130         u32 sicr;       /* 0x24 */
 131         u32 txftr;      /* 0x28 */
 132         u32 rxftr;      /* 0x2C */
 133         u32 gpior;      /* 0x30 */
 134         u32 reserved0;  /* 0x34 */
 135         u32 lpbkdly;    /* 0x38 */
 136         u32 reserved1;  /* 0x3C */
 137         u32 genfifo;    /* 0x40 */
 138         u32 gqspisel;   /* 0x44 */
 139         u32 reserved2;  /* 0x48 */
 140         u32 gqfifoctrl; /* 0x4C */
 141         u32 gqfthr;     /* 0x50 */
 142         u32 gqpollcfg;  /* 0x54 */
 143         u32 gqpollto;   /* 0x58 */
 144         u32 gqxfersts;  /* 0x5C */
 145         u32 gqfifosnap; /* 0x60 */
 146         u32 gqrxcpy;    /* 0x64 */
 147         u32 reserved3[36];      /* 0x68 */
 148         u32 gqspidlyadj;        /* 0xF8 */
 149 };
 150
 151 struct zynqmp_qspi_dma_regs {
 152         u32 dmadst;     /* 0x00 */
 153         u32 dmasize;    /* 0x04 */
 154         u32 dmasts;     /* 0x08 */
 155         u32 dmactrl;    /* 0x0C */
 156         u32 reserved0;  /* 0x10 */
 157         u32 dmaisr;     /* 0x14 */
 158         u32 dmaier;     /* 0x18 */
 159         u32 dmaidr;     /* 0x1C */
 160         u32 dmaimr;     /* 0x20 */
 161         u32 dmactrl2;   /* 0x24 */
 162         u32 dmadstmsb;  /* 0x28 */
 163 };
 164
 165 struct zynqmp_qspi_plat {
 166         struct zynqmp_qspi_regs *regs;
 167         struct zynqmp_qspi_dma_regs *dma_regs;
 168         u32 frequency;
 169         u32 speed_hz;
 170         unsigned int io_mode;
 171 };
 172
 173 struct zynqmp_qspi_priv {
 174         struct zynqmp_qspi_regs *regs;
 175         struct zynqmp_qspi_dma_regs *dma_regs;
 176         const void *tx_buf;
 177         void *rx_buf;
 178         unsigned int len;
 179         unsigned int io_mode;
 180         int bytes_to_transfer;
 181         int bytes_to_receive;
 182         const struct spi_mem_op *op;
 183 };
 184
 185 static int zynqmp_qspi_of_to_plat(struct udevice *bus)
 186 {
 187         struct zynqmp_qspi_plat *plat = dev_get_plat(bus);
 188
 189         debug("%s\n", __func__);
 190
 191         plat->regs = (struct zynqmp_qspi_regs *)(dev_read_addr(bus) +
 192                                                  GQSPI_REG_OFFSET);
 193         plat->dma_regs = (struct zynqmp_qspi_dma_regs *)
 194                           (dev_read_addr(bus) + GQSPI_DMA_REG_OFFSET);
 195
 196         plat->io_mode = dev_read_bool(bus, "has-io-mode");
 197
 198         return 0;
 199 }
 200
 201 static void zynqmp_qspi_init_hw(struct zynqmp_qspi_priv *priv)
 202 {
 203         u32 config_reg;
 204         struct zynqmp_qspi_regs *regs = priv->regs;
 205
 206         writel(GQSPI_GFIFO_SELECT, &regs->gqspisel);
 207         writel(GQSPI_GFIFO_ALL_INT_MASK, &regs->idisr);
 208         writel(GQSPI_FIFO_THRESHOLD, &regs->txftr);
 209         writel(GQSPI_FIFO_THRESHOLD, &regs->rxftr);
 210         writel(GQSPI_GENFIFO_THRESHOLD, &regs->gqfthr);
 211         writel(GQSPI_GFIFO_ALL_INT_MASK, &regs->isr);
 212         writel(~GQSPI_ENABLE_ENABLE_MASK, &regs->enbr);
 213
 214         config_reg = readl(&regs->confr);
 215         config_reg &= ~(GQSPI_GFIFO_STRT_MODE_MASK |
 216                         GQSPI_CONFIG_MODE_EN_MASK);
 217         config_reg |= GQSPI_GFIFO_WP_HOLD | GQSPI_DFLT_BAUD_RATE_DIV;
 218         config_reg |= GQSPI_GFIFO_STRT_MODE_MASK;
 219         if (!priv->io_mode)
 220                 config_reg |= GQSPI_CONFIG_DMA_MODE;
 221
 222         writel(config_reg, &regs->confr);
 223
 224         writel(GQSPI_ENABLE_ENABLE_MASK, &regs->enbr);
 225 }
 226
 227 static u32 zynqmp_qspi_bus_select(struct zynqmp_qspi_priv *priv)
 228 {
 229         u32 gqspi_fifo_reg = 0;
 230
 231         gqspi_fifo_reg = GQSPI_GFIFO_LOW_BUS |
 232                          GQSPI_GFIFO_CS_LOWER;
 233
 234         return gqspi_fifo_reg;
 235 }
 236
 237 static u32 zynqmp_qspi_genfifo_mode(u8 buswidth)
 238 {
 239         switch (buswidth) {
 240         case 1:
 241                 return GQSPI_SPI_MODE_SPI;
 242         case 2:
 243                 return GQSPI_SPI_MODE_DUAL_SPI;
 244         case 4:
 245                 return GQSPI_SPI_MODE_QSPI;
 246         default:
 247                 debug("Unsupported bus width %u\n", buswidth);
 248                 return GQSPI_SPI_MODE_SPI;
 249         }
 250 }
 251
 252 static void zynqmp_qspi_fill_gen_fifo(struct zynqmp_qspi_priv *priv,
 253                                       u32 gqspi_fifo_reg)
 254 {
 255         struct zynqmp_qspi_regs *regs = priv->regs;
 256         u32 config_reg, ier;
 257         int ret = 0;
 258
 259         writel(gqspi_fifo_reg, &regs->genfifo);
 260
 261         config_reg = readl(&regs->confr);
 262         /* Manual start if needed */
 263         config_reg |= GQSPI_STRT_GEN_FIFO;
 264         writel(config_reg, &regs->confr);
 265
 266         /* Enable interrupts */
 267         ier = readl(&regs->ier);
 268         ier |= GQSPI_IXR_GFEMTY_MASK;
 269         writel(ier, &regs->ier);
 270
 271         /* Wait until the gen fifo is empty to write the new command */
 272         ret = wait_for_bit_le32(&regs->isr, GQSPI_IXR_GFEMTY_MASK, 1,
 273                                 GQSPI_TIMEOUT, 1);
 274         if (ret)
 275                 printf("%s Timeout\n", __func__);
 276
 277 }
 278
 279 static void zynqmp_qspi_chipselect(struct zynqmp_qspi_priv *priv, int is_on)
 280 {
 281         u32 gqspi_fifo_reg = 0;
 282
 283         if (is_on) {
 284                 gqspi_fifo_reg = zynqmp_qspi_bus_select(priv);
 285                 gqspi_fifo_reg |= GQSPI_SPI_MODE_SPI |
 286                                   GQSPI_IMD_DATA_CS_ASSERT;
 287         } else {
 288                 gqspi_fifo_reg = GQSPI_GFIFO_LOW_BUS;
 289                 gqspi_fifo_reg |= GQSPI_IMD_DATA_CS_DEASSERT;
 290         }
 291
 292         debug("GFIFO_CMD_CS: 0x%x\n", gqspi_fifo_reg);
 293
 294         zynqmp_qspi_fill_gen_fifo(priv, gqspi_fifo_reg);
 295 }
 296
 297 void zynqmp_qspi_set_tapdelay(struct udevice *bus, u32 baudrateval)
 298 {
 299         struct zynqmp_qspi_plat *plat = dev_get_plat(bus);
 300         struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
 301         struct zynqmp_qspi_regs *regs = priv->regs;
 302         u32 tapdlybypass = 0, lpbkdlyadj = 0, datadlyadj = 0, clk_rate;
 303         u32 reqhz = 0;
 304
 305         clk_rate = plat->frequency;
 306         reqhz = (clk_rate / (GQSPI_BAUD_DIV_SHIFT << baudrateval));
 307
 308         debug("%s, req_hz:%d, clk_rate:%d, baudrateval:%d\n",
 309               __func__, reqhz, clk_rate, baudrateval);
 310
 311         if (!IS_ENABLED(CONFIG_ARCH_VERSAL)) {
 312                 if (reqhz <= GQSPI_FREQ_40MHZ) {
 313                         tapdlybypass = TAP_DLY_BYPASS_LQSPI_RX_VALUE <<
 314                                         TAP_DLY_BYPASS_LQSPI_RX_SHIFT;
 315                 } else if (reqhz <= GQSPI_FREQ_100MHZ) {
 316                         tapdlybypass = TAP_DLY_BYPASS_LQSPI_RX_VALUE <<
 317                                         TAP_DLY_BYPASS_LQSPI_RX_SHIFT;
 318                         lpbkdlyadj = GQSPI_LPBK_DLY_ADJ_LPBK_MASK;
 319                         datadlyadj = (GQSPI_USE_DATA_DLY <<
 320                                       GQSPI_USE_DATA_DLY_SHIFT) |
 321                                        (GQSPI_DATA_DLY_ADJ_VALUE <<
 322                                         GQSPI_DATA_DLY_ADJ_SHIFT);
 323                 } else if (reqhz <= GQSPI_FREQ_150MHZ) {
 324                         lpbkdlyadj = GQSPI_LPBK_DLY_ADJ_LPBK_MASK |
 325                                       GQSPI_LPBK_DLY_ADJ_DLY_0;
 326                 }
 327                 zynqmp_mmio_write(IOU_TAPDLY_BYPASS_OFST,
 328                                   IOU_TAPDLY_BYPASS_MASK, tapdlybypass);
 329         } else {
 330                 if (reqhz <= GQSPI_FREQ_37_5MHZ) {
 331                         tapdlybypass = TAP_DLY_BYPASS_LQSPI_RX_VALUE <<
 332                                         TAP_DLY_BYPASS_LQSPI_RX_SHIFT;
 333                 } else if (reqhz <= GQSPI_FREQ_100MHZ) {
 334                         tapdlybypass = TAP_DLY_BYPASS_LQSPI_RX_VALUE <<
 335                                         TAP_DLY_BYPASS_LQSPI_RX_SHIFT;
 336                         lpbkdlyadj = GQSPI_LPBK_DLY_ADJ_LPBK_MASK;
 337                         datadlyadj = GQSPI_USE_DATA_DLY <<
 338                                       GQSPI_USE_DATA_DLY_SHIFT;
 339                 } else if (reqhz <= GQSPI_FREQ_150MHZ) {
 340                         lpbkdlyadj = GQSPI_LPBK_DLY_ADJ_LPBK_MASK |
 341                                       (GQSPI_LPBK_DLY_ADJ_DLY_1 <<
 342                                        GQSPI_LPBK_DLY_ADJ_DLY_1_SHIFT);
 343                 }
 344                 writel(tapdlybypass, IOU_TAPDLY_BYPASS_OFST);
 345         }
 346         writel(lpbkdlyadj, &regs->lpbkdly);
 347         writel(datadlyadj, &regs->gqspidlyadj);
 348 }
 349
 350 static int zynqmp_qspi_set_speed(struct udevice *bus, uint speed)
 351 {
 352         struct zynqmp_qspi_plat *plat = dev_get_plat(bus);
 353         struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
 354         struct zynqmp_qspi_regs *regs = priv->regs;
 355         u32 confr;
 356         u8 baud_rate_val = 0;
 357
 358         debug("%s\n", __func__);
 359         if (speed > plat->frequency)
 360                 speed = plat->frequency;
 361
 362         if (plat->speed_hz != speed) {
 363                 /* Set the clock frequency */
 364                 /* If speed == 0, default to lowest speed */
 365                 while ((baud_rate_val < 8) &&
 366                        ((plat->frequency /
 367                        (2 << baud_rate_val)) > speed))
 368                         baud_rate_val++;
 369
 370                 if (baud_rate_val > GQSPI_MAX_BAUD_RATE_VAL)
 371                         baud_rate_val = GQSPI_DFLT_BAUD_RATE_VAL;
 372
 373                 plat->speed_hz = plat->frequency / (2 << baud_rate_val);
 374
 375                 confr = readl(&regs->confr);
 376                 confr &= ~GQSPI_BAUD_DIV_MASK;
 377                 confr |= (baud_rate_val << 3);
 378                 writel(confr, &regs->confr);
 379                 zynqmp_qspi_set_tapdelay(bus, baud_rate_val);
 380
 381                 debug("regs=%p, speed=%d\n", priv->regs, plat->speed_hz);
 382         }
 383
 384         return 0;
 385 }
 386
 387 static int zynqmp_qspi_probe(struct udevice *bus)
 388 {
 389         struct zynqmp_qspi_plat *plat = dev_get_plat(bus);
 390         struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
 391         struct clk clk;
 392         unsigned long clock;
 393         int ret;
 394
 395         debug("%s: bus:%p, priv:%p\n", __func__, bus, priv);
 396
 397         priv->regs = plat->regs;
 398         priv->dma_regs = plat->dma_regs;
 399         priv->io_mode = plat->io_mode;
 400
 401         ret = clk_get_by_index(bus, 0, &clk);
 402         if (ret < 0) {
 403                 dev_err(bus, "failed to get clock\n");
 404                 return ret;
 405         }
 406
 407         clock = clk_get_rate(&clk);
 408         if (IS_ERR_VALUE(clock)) {
 409                 dev_err(bus, "failed to get rate\n");
 410                 return clock;
 411         }
 412         debug("%s: CLK %ld\n", __func__, clock);
 413
 414         ret = clk_enable(&clk);
 415         if (ret) {
 416                 dev_err(bus, "failed to enable clock\n");
 417                 return ret;
 418         }
 419         plat->frequency = clock;
 420         plat->speed_hz = plat->frequency / 2;
 421
 422         /* init the zynq spi hw */
 423         zynqmp_qspi_init_hw(priv);
 424
 425         return 0;
 426 }
 427
 428 static int zynqmp_qspi_set_mode(struct udevice *bus, uint mode)
 429 {
 430         struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
 431         struct zynqmp_qspi_regs *regs = priv->regs;
 432         u32 confr;
 433
 434         debug("%s\n", __func__);
 435         /* Set the SPI Clock phase and polarities */
 436         confr = readl(&regs->confr);
 437         confr &= ~(GQSPI_CONFIG_CPHA_MASK | GQSPI_CONFIG_CPOL_MASK);
 438
 439         if (mode & SPI_CPHA)
 440                 confr |= GQSPI_CONFIG_CPHA_MASK;
 441         if (mode & SPI_CPOL)
 442                 confr |= GQSPI_CONFIG_CPOL_MASK;
 443
 444         writel(confr, &regs->confr);
 445
 446         return 0;
 447 }
 448
 449 static int zynqmp_qspi_fill_tx_fifo(struct zynqmp_qspi_priv *priv, u32 size)
 450 {
 451         u32 data;
 452         int ret = 0;
 453         struct zynqmp_qspi_regs *regs = priv->regs;
 454         u32 *buf = (u32 *)priv->tx_buf;
 455         u32 len = size;
 456
 457         debug("TxFIFO: 0x%x, size: 0x%x\n", readl(&regs->isr),
 458               size);
 459
 460         while (size) {
 461                 ret = wait_for_bit_le32(&regs->isr, GQSPI_IXR_TXNFULL_MASK, 1,
 462                                         GQSPI_TIMEOUT, 1);
 463                 if (ret) {
 464                         printf("%s: Timeout\n", __func__);
 465                         return ret;
 466                 }
 467
 468                 if (size >= 4) {
 469                         writel(*buf, &regs->txd0r);
 470                         buf++;
 471                         size -= 4;
 472                 } else {
 473                         switch (size) {
 474                         case 1:
 475                                 data = *((u8 *)buf);
 476                                 buf += 1;
 477                                 data |= GENMASK(31, 8);
 478                                 break;
 479                         case 2:
 480                                 data = *((u16 *)buf);
 481                                 buf += 2;
 482                                 data |= GENMASK(31, 16);
 483                                 break;
 484                         case 3:
 485                                 data = *buf;
 486                                 buf += 3;
 487                                 data |= GENMASK(31, 24);
 488                                 break;
 489                         }
 490                         writel(data, &regs->txd0r);
 491                         size = 0;
 492                 }
 493         }
 494
 495         ret = wait_for_bit_le32(&regs->isr, GQSPI_IXR_TXFIFOEMPTY_MASK, 1,
 496                                 GQSPI_TIMEOUT, 1);
 497         if (ret) {
 498                 printf("%s: Timeout\n", __func__);
 499                 return ret;
 500         }
 501
 502         priv->tx_buf += len;
 503         return 0;
 504 }
 505
 506 static void zynqmp_qspi_genfifo_cmd(struct zynqmp_qspi_priv *priv)
 507 {
 508         const struct spi_mem_op *op = priv->op;
 509         u32 gen_fifo_cmd;
 510         u8 i, dummy_cycles, addr;
 511
 512         /* Send opcode */
 513         gen_fifo_cmd = zynqmp_qspi_bus_select(priv);
 514         gen_fifo_cmd |= zynqmp_qspi_genfifo_mode(op->cmd.buswidth);
 515         gen_fifo_cmd |= GQSPI_GFIFO_TX;
 516         gen_fifo_cmd |= op->cmd.opcode;
 517         zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
 518
 519         /* Send address */
 520         for (i = 0; i < op->addr.nbytes; i++) {
 521                 addr = op->addr.val >> (8 * (op->addr.nbytes - i - 1));
 522
 523                 gen_fifo_cmd = zynqmp_qspi_bus_select(priv);
 524                 gen_fifo_cmd |= zynqmp_qspi_genfifo_mode(op->addr.buswidth);
 525                 gen_fifo_cmd |= GQSPI_GFIFO_TX;
 526                 gen_fifo_cmd |= addr;
 527
 528                 debug("GFIFO_CMD_Cmd = 0x%x\n", gen_fifo_cmd);
 529
 530                 zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
 531         }
 532
 533         /* Send dummy */
 534         if (op->dummy.nbytes) {
 535                 dummy_cycles = op->dummy.nbytes * 8 / op->dummy.buswidth;
 536
 537                 gen_fifo_cmd = zynqmp_qspi_bus_select(priv);
 538                 gen_fifo_cmd |= zynqmp_qspi_genfifo_mode(op->dummy.buswidth);
 539                 gen_fifo_cmd &= ~(GQSPI_GFIFO_TX | GQSPI_GFIFO_RX);
 540                 gen_fifo_cmd |= GQSPI_GFIFO_DATA_XFR_MASK;
 541                 gen_fifo_cmd |= dummy_cycles;
 542                 zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
 543         }
 544 }
 545
 546 static u32 zynqmp_qspi_calc_exp(struct zynqmp_qspi_priv *priv,
 547                                 u32 *gen_fifo_cmd)
 548 {
 549         u32 expval = 8;
 550         u32 len;
 551
 552         while (1) {
 553                 if (priv->len > 255) {
 554                         if (priv->len & (1 << expval)) {
 555                                 *gen_fifo_cmd &= ~GQSPI_GFIFO_IMD_MASK;
 556                                 *gen_fifo_cmd |= GQSPI_GFIFO_EXP_MASK;
 557                                 *gen_fifo_cmd |= expval;
 558                                 priv->len -= (1 << expval);
 559                                 return expval;
 560                         }
 561                         expval++;
 562                 } else {
 563                         *gen_fifo_cmd &= ~(GQSPI_GFIFO_IMD_MASK |
 564                                           GQSPI_GFIFO_EXP_MASK);
 565                         *gen_fifo_cmd |= (u8)priv->len;
 566                         len = (u8)priv->len;
 567                         priv->len  = 0;
 568                         return len;
 569                 }
 570         }
 571 }
 572
 573 static int zynqmp_qspi_genfifo_fill_tx(struct zynqmp_qspi_priv *priv)
 574 {
 575         u32 gen_fifo_cmd;
 576         u32 len;
 577         int ret = 0;
 578
 579         gen_fifo_cmd = zynqmp_qspi_bus_select(priv);
 580         gen_fifo_cmd |= zynqmp_qspi_genfifo_mode(priv->op->data.buswidth);
 581         gen_fifo_cmd |= GQSPI_GFIFO_TX | GQSPI_GFIFO_DATA_XFR_MASK;
 582
 583         while (priv->len) {
 584                 len = zynqmp_qspi_calc_exp(priv, &gen_fifo_cmd);
 585                 zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
 586
 587                 debug("GFIFO_CMD_TX:0x%x\n", gen_fifo_cmd);
 588
 589                 if (gen_fifo_cmd & GQSPI_GFIFO_EXP_MASK)
 590                         ret = zynqmp_qspi_fill_tx_fifo(priv, 1 << len);
 591                 else
 592                         ret = zynqmp_qspi_fill_tx_fifo(priv, len);
 593
 594                 if (ret)
 595                         return ret;
 596         }
 597         return ret;
 598 }
 599
 600 static int zynqmp_qspi_start_io(struct zynqmp_qspi_priv *priv,
 601                                 u32 gen_fifo_cmd, u32 *buf)
 602 {
 603         u32 len;
 604         u32 actuallen = priv->len;
 605         u32 config_reg, ier, isr;
 606         u32 timeout = GQSPI_TIMEOUT;
 607         struct zynqmp_qspi_regs *regs = priv->regs;
 608         u32 last_bits;
 609         u32 *traverse = buf;
 610
 611         while (priv->len) {
 612                 len = zynqmp_qspi_calc_exp(priv, &gen_fifo_cmd);
 613                 /* If exponent bit is set, reset immediate to be 2^len */
 614                 if (gen_fifo_cmd & GQSPI_GFIFO_EXP_MASK)
 615                         priv->bytes_to_receive = (1 << len);
 616                 else
 617                         priv->bytes_to_receive = len;
 618                 zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
 619                 debug("GFIFO_CMD_RX:0x%x\n", gen_fifo_cmd);
 620                 /* Manual start */
 621                 config_reg = readl(&regs->confr);
 622                 config_reg |= GQSPI_STRT_GEN_FIFO;
 623                 writel(config_reg, &regs->confr);
 624                 /* Enable RX interrupts for IO mode */
 625                 ier = readl(&regs->ier);
 626                 ier |= GQSPI_IXR_ALL_MASK;
 627                 writel(ier, &regs->ier);
 628                 while (priv->bytes_to_receive && timeout) {
 629                         isr = readl(&regs->isr);
 630                         if (isr & GQSPI_IXR_RXNEMTY_MASK) {
 631                                 if (priv->bytes_to_receive >= 4) {
 632                                         *traverse = readl(&regs->drxr);
 633                                         traverse++;
 634                                         priv->bytes_to_receive -= 4;
 635                                 } else {
 636                                         last_bits = readl(&regs->drxr);
 637                                         memcpy(traverse, &last_bits,
 638                                                priv->bytes_to_receive);
 639                                         priv->bytes_to_receive = 0;
 640                                 }
 641                                 timeout = GQSPI_TIMEOUT;
 642                         } else {
 643                                 udelay(1);
 644                                 timeout--;
 645                         }
 646                 }
 647
 648                 debug("buf:0x%lx, rxbuf:0x%lx, *buf:0x%x len: 0x%x\n",
 649                       (unsigned long)buf, (unsigned long)priv->rx_buf,
 650                       *buf, actuallen);
 651                 if (!timeout) {
 652                         printf("IO timeout: %d\n", readl(&regs->isr));
 653                         return -1;
 654                 }
 655         }
 656
 657         return 0;
 658 }
 659
 660 static int zynqmp_qspi_start_dma(struct zynqmp_qspi_priv *priv,
 661                                  u32 gen_fifo_cmd, u32 *buf)
 662 {
 663         u32 addr;
 664         u32 size;
 665         u32 actuallen = priv->len;
 666         u32 totallen = priv->len;
 667         int ret = 0;
 668         struct zynqmp_qspi_dma_regs *dma_regs = priv->dma_regs;
 669
 670         while (totallen) {
 671                 if (totallen >= SZ_512M)
 672                         priv->len = SZ_256M;
 673                 else
 674                         priv->len = totallen;
 675
 676                 totallen -= priv->len; /* Save remaining bytes length to read */
 677                 actuallen = priv->len; /* Actual number of bytes reading */
 678
 679                 writel((unsigned long)buf, &dma_regs->dmadst);
 680                 writel(roundup(priv->len, GQSPI_DMA_ALIGN), &dma_regs->dmasize);
 681                 writel(GQSPI_DMA_DST_I_STS_MASK, &dma_regs->dmaier);
 682                 addr = (unsigned long)buf;
 683                 size = roundup(priv->len, GQSPI_DMA_ALIGN);
 684                 flush_dcache_range(addr, addr + size);
 685
 686                 while (priv->len) {
 687                         zynqmp_qspi_calc_exp(priv, &gen_fifo_cmd);
 688                         zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
 689
 690                         debug("GFIFO_CMD_RX:0x%x\n", gen_fifo_cmd);
 691                 }
 692
 693                 ret = wait_for_bit_le32(&dma_regs->dmaisr,
 694                                         GQSPI_DMA_DST_I_STS_DONE, 1,
 695                                         GQSPI_TIMEOUT, 1);
 696                 if (ret) {
 697                         printf("DMA Timeout:0x%x\n", readl(&dma_regs->dmaisr));
 698                         return -ETIMEDOUT;
 699                 }
 700
 701                 writel(GQSPI_DMA_DST_I_STS_DONE, &dma_regs->dmaisr);
 702
 703                 debug("buf:0x%lx, rxbuf:0x%lx, *buf:0x%x len: 0x%x\n",
 704                       (unsigned long)buf, (unsigned long)priv->rx_buf, *buf,
 705                       actuallen);
 706
 707                 if (buf != priv->rx_buf)
 708                         memcpy(priv->rx_buf, buf, actuallen);
 709
 710                 buf = (u32 *)((u8 *)buf + actuallen);
 711                 priv->rx_buf = (u8 *)priv->rx_buf + actuallen;
 712         }
 713
 714         return 0;
 715 }
 716
 717 static int zynqmp_qspi_genfifo_fill_rx(struct zynqmp_qspi_priv *priv)
 718 {
 719         u32 gen_fifo_cmd;
 720         u32 *buf;
 721         u32 actuallen = priv->len;
 722
 723         gen_fifo_cmd = zynqmp_qspi_bus_select(priv);
 724         gen_fifo_cmd |= zynqmp_qspi_genfifo_mode(priv->op->data.buswidth);
 725         gen_fifo_cmd |= GQSPI_GFIFO_RX | GQSPI_GFIFO_DATA_XFR_MASK;
 726
 727         /*
 728          * Check if receive buffer is aligned to 4 byte and length
 729          * is multiples of four byte as we are using dma to receive.
 730          */
 731         if ((!((unsigned long)priv->rx_buf & (GQSPI_DMA_ALIGN - 1)) &&
 732              !(actuallen % GQSPI_DMA_ALIGN)) || priv->io_mode) {
 733                 buf = (u32 *)priv->rx_buf;
 734                 if (priv->io_mode)
 735                         return zynqmp_qspi_start_io(priv, gen_fifo_cmd, buf);
 736                 else
 737                         return zynqmp_qspi_start_dma(priv, gen_fifo_cmd, buf);
 738         }
 739
 740         ALLOC_CACHE_ALIGN_BUFFER(u8, tmp, roundup(priv->len, GQSPI_DMA_ALIGN));
 741         buf = (u32 *)tmp;
 742         return zynqmp_qspi_start_dma(priv, gen_fifo_cmd, buf);
 743 }
 744
 745 static int zynqmp_qspi_claim_bus(struct udevice *dev)
 746 {
 747         struct udevice *bus = dev->parent;
 748         struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
 749         struct zynqmp_qspi_regs *regs = priv->regs;
 750
 751         writel(GQSPI_ENABLE_ENABLE_MASK, &regs->enbr);
 752
 753         return 0;
 754 }
 755
 756 static int zynqmp_qspi_release_bus(struct udevice *dev)
 757 {
 758         struct udevice *bus = dev->parent;
 759         struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
 760         struct zynqmp_qspi_regs *regs = priv->regs;
 761
 762         writel(~GQSPI_ENABLE_ENABLE_MASK, &regs->enbr);
 763
 764         return 0;
 765 }
 766
 767 static int zynqmp_qspi_exec_op(struct spi_slave *slave,
 768                                const struct spi_mem_op *op)
 769 {
 770         struct zynqmp_qspi_priv *priv = dev_get_priv(slave->dev->parent);
 771         int ret = 0;
 772
 773         priv->op = op;
 774         priv->tx_buf = op->data.buf.out;
 775         priv->rx_buf = op->data.buf.in;
 776         priv->len = op->data.nbytes;
 777
 778         zynqmp_qspi_chipselect(priv, 1);
 779
 780         /* Send opcode, addr, dummy */
 781         zynqmp_qspi_genfifo_cmd(priv);
 782
 783         /* Request the transfer */
 784         if (op->data.dir == SPI_MEM_DATA_IN)
 785                 ret = zynqmp_qspi_genfifo_fill_rx(priv);
 786         else if (op->data.dir == SPI_MEM_DATA_OUT)
 787                 ret = zynqmp_qspi_genfifo_fill_tx(priv);
 788
 789         zynqmp_qspi_chipselect(priv, 0);
 790
 791         return ret;
 792 }
 793
 794 static const struct spi_controller_mem_ops zynqmp_qspi_mem_ops = {
 795         .exec_op = zynqmp_qspi_exec_op,
 796 };
 797
 798 static const struct dm_spi_ops zynqmp_qspi_ops = {
 799         .claim_bus      = zynqmp_qspi_claim_bus,
 800         .release_bus    = zynqmp_qspi_release_bus,
 801         .set_speed      = zynqmp_qspi_set_speed,
 802         .set_mode       = zynqmp_qspi_set_mode,
 803         .mem_ops        = &zynqmp_qspi_mem_ops,
 804 };
 805
 806 static const struct udevice_id zynqmp_qspi_ids[] = {
 807         { .compatible = "xlnx,zynqmp-qspi-1.0" },
 808         { .compatible = "xlnx,versal-qspi-1.0" },
 809         { }
 810 };
 811
 812 U_BOOT_DRIVER(zynqmp_qspi) = {
 813         .name   = "zynqmp_qspi",
 814         .id     = UCLASS_SPI,
 815         .of_match = zynqmp_qspi_ids,
 816         .ops    = &zynqmp_qspi_ops,
 817         .of_to_plat = zynqmp_qspi_of_to_plat,
 818         .plat_auto      = sizeof(struct zynqmp_qspi_plat),
 819         .priv_auto      = sizeof(struct zynqmp_qspi_priv),
 820         .probe  = zynqmp_qspi_probe,
 821 };