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 <asm/arch/clk.h>
  10 #include <asm/arch/hardware.h>
  11 #include <asm/arch/sys_proto.h>
  12 #include <asm/io.h>
  13 #include <clk.h>
  14 #include <dm.h>
  15 #include <malloc.h>
  16 #include <memalign.h>
  17 #include <spi.h>
  18 #include <ubi_uboot.h>
  19 #include <wait_bit.h>
  20
  21 #define GQSPI_GFIFO_STRT_MODE_MASK      BIT(29)
  22 #define GQSPI_CONFIG_MODE_EN_MASK       (3 << 30)
  23 #define GQSPI_CONFIG_DMA_MODE           (2 << 30)
  24 #define GQSPI_CONFIG_CPHA_MASK          BIT(2)
  25 #define GQSPI_CONFIG_CPOL_MASK          BIT(1)
  26
  27 /*
  28  * QSPI Interrupt Registers bit Masks
  29  *
  30  * All the four interrupt registers (Status/Mask/Enable/Disable) have the same
  31  * bit definitions.
  32  */
  33 #define GQSPI_IXR_TXNFULL_MASK          0x00000004 /* QSPI TX FIFO Overflow */
  34 #define GQSPI_IXR_TXFULL_MASK           0x00000008 /* QSPI TX FIFO is full */
  35 #define GQSPI_IXR_RXNEMTY_MASK          0x00000010 /* QSPI RX FIFO Not Empty */
  36 #define GQSPI_IXR_GFEMTY_MASK           0x00000080 /* QSPI Generic FIFO Empty */
  37 #define GQSPI_IXR_ALL_MASK              (GQSPI_IXR_TXNFULL_MASK | \
  38                                          GQSPI_IXR_RXNEMTY_MASK)
  39
  40 /*
  41  * QSPI Enable Register bit Masks
  42  *
  43  * This register is used to enable or disable the QSPI controller
  44  */
  45 #define GQSPI_ENABLE_ENABLE_MASK        0x00000001 /* QSPI Enable Bit Mask */
  46
  47 #define GQSPI_GFIFO_LOW_BUS             BIT(14)
  48 #define GQSPI_GFIFO_CS_LOWER            BIT(12)
  49 #define GQSPI_GFIFO_UP_BUS              BIT(15)
  50 #define GQSPI_GFIFO_CS_UPPER            BIT(13)
  51 #define GQSPI_SPI_MODE_QSPI             (3 << 10)
  52 #define GQSPI_SPI_MODE_SPI              BIT(10)
  53 #define GQSPI_SPI_MODE_DUAL_SPI         (2 << 10)
  54 #define GQSPI_IMD_DATA_CS_ASSERT        5
  55 #define GQSPI_IMD_DATA_CS_DEASSERT      5
  56 #define GQSPI_GFIFO_TX                  BIT(16)
  57 #define GQSPI_GFIFO_RX                  BIT(17)
  58 #define GQSPI_GFIFO_STRIPE_MASK         BIT(18)
  59 #define GQSPI_GFIFO_IMD_MASK            0xFF
  60 #define GQSPI_GFIFO_EXP_MASK            BIT(9)
  61 #define GQSPI_GFIFO_DATA_XFR_MASK       BIT(8)
  62 #define GQSPI_STRT_GEN_FIFO             BIT(28)
  63 #define GQSPI_GEN_FIFO_STRT_MOD         BIT(29)
  64 #define GQSPI_GFIFO_WP_HOLD             BIT(19)
  65 #define GQSPI_BAUD_DIV_MASK             (7 << 3)
  66 #define GQSPI_DFLT_BAUD_RATE_DIV        BIT(3)
  67 #define GQSPI_GFIFO_ALL_INT_MASK        0xFBE
  68 #define GQSPI_DMA_DST_I_STS_DONE        BIT(1)
  69 #define GQSPI_DMA_DST_I_STS_MASK        0xFE
  70 #define MODEBITS                        0x6
  71
  72 #define GQSPI_GFIFO_SELECT              BIT(0)
  73 #define GQSPI_FIFO_THRESHOLD            1
  74
  75 #define SPI_XFER_ON_BOTH                0
  76 #define SPI_XFER_ON_LOWER               1
  77 #define SPI_XFER_ON_UPPER               2
  78
  79 #define GQSPI_DMA_ALIGN                 0x4
  80 #define GQSPI_MAX_BAUD_RATE_VAL         7
  81 #define GQSPI_DFLT_BAUD_RATE_VAL        2
  82
  83 #define GQSPI_TIMEOUT                   100000000
  84
  85 #define GQSPI_BAUD_DIV_SHIFT            2
  86 #define GQSPI_LPBK_DLY_ADJ_LPBK_SHIFT   5
  87 #define GQSPI_LPBK_DLY_ADJ_DLY_1        0x2
  88 #define GQSPI_LPBK_DLY_ADJ_DLY_1_SHIFT  3
  89 #define GQSPI_LPBK_DLY_ADJ_DLY_0        0x3
  90 #define GQSPI_USE_DATA_DLY              0x1
  91 #define GQSPI_USE_DATA_DLY_SHIFT        31
  92 #define GQSPI_DATA_DLY_ADJ_VALUE        0x2
  93 #define GQSPI_DATA_DLY_ADJ_SHIFT        28
  94 #define TAP_DLY_BYPASS_LQSPI_RX_VALUE   0x1
  95 #define TAP_DLY_BYPASS_LQSPI_RX_SHIFT   2
  96 #define GQSPI_DATA_DLY_ADJ_OFST         0x000001F8
  97 #define IOU_TAPDLY_BYPASS_OFST          0xFF180390
  98 #define GQSPI_LPBK_DLY_ADJ_LPBK_MASK    0x00000020
  99 #define GQSPI_FREQ_40MHZ                40000000
 100 #define GQSPI_FREQ_100MHZ               100000000
 101 #define GQSPI_FREQ_150MHZ               150000000
 102 #define IOU_TAPDLY_BYPASS_MASK          0x7
 103
 104 #define GQSPI_REG_OFFSET                0x100
 105 #define GQSPI_DMA_REG_OFFSET            0x800
 106
 107 /* QSPI register offsets */
 108 struct zynqmp_qspi_regs {
 109         u32 confr;      /* 0x00 */
 110         u32 isr;        /* 0x04 */
 111         u32 ier;        /* 0x08 */
 112         u32 idisr;      /* 0x0C */
 113         u32 imaskr;     /* 0x10 */
 114         u32 enbr;       /* 0x14 */
 115         u32 dr;         /* 0x18 */
 116         u32 txd0r;      /* 0x1C */
 117         u32 drxr;       /* 0x20 */
 118         u32 sicr;       /* 0x24 */
 119         u32 txftr;      /* 0x28 */
 120         u32 rxftr;      /* 0x2C */
 121         u32 gpior;      /* 0x30 */
 122         u32 reserved0;  /* 0x34 */
 123         u32 lpbkdly;    /* 0x38 */
 124         u32 reserved1;  /* 0x3C */
 125         u32 genfifo;    /* 0x40 */
 126         u32 gqspisel;   /* 0x44 */
 127         u32 reserved2;  /* 0x48 */
 128         u32 gqfifoctrl; /* 0x4C */
 129         u32 gqfthr;     /* 0x50 */
 130         u32 gqpollcfg;  /* 0x54 */
 131         u32 gqpollto;   /* 0x58 */
 132         u32 gqxfersts;  /* 0x5C */
 133         u32 gqfifosnap; /* 0x60 */
 134         u32 gqrxcpy;    /* 0x64 */
 135         u32 reserved3[36];      /* 0x68 */
 136         u32 gqspidlyadj;        /* 0xF8 */
 137 };
 138
 139 struct zynqmp_qspi_dma_regs {
 140         u32 dmadst;     /* 0x00 */
 141         u32 dmasize;    /* 0x04 */
 142         u32 dmasts;     /* 0x08 */
 143         u32 dmactrl;    /* 0x0C */
 144         u32 reserved0;  /* 0x10 */
 145         u32 dmaisr;     /* 0x14 */
 146         u32 dmaier;     /* 0x18 */
 147         u32 dmaidr;     /* 0x1C */
 148         u32 dmaimr;     /* 0x20 */
 149         u32 dmactrl2;   /* 0x24 */
 150         u32 dmadstmsb;  /* 0x28 */
 151 };
 152
 153 DECLARE_GLOBAL_DATA_PTR;
 154
 155 struct zynqmp_qspi_platdata {
 156         struct zynqmp_qspi_regs *regs;
 157         struct zynqmp_qspi_dma_regs *dma_regs;
 158         u32 frequency;
 159         u32 speed_hz;
 160 };
 161
 162 struct zynqmp_qspi_priv {
 163         struct zynqmp_qspi_regs *regs;
 164         struct zynqmp_qspi_dma_regs *dma_regs;
 165         const void *tx_buf;
 166         void *rx_buf;
 167         unsigned int len;
 168         int bytes_to_transfer;
 169         int bytes_to_receive;
 170         unsigned int is_inst;
 171         unsigned int cs_change:1;
 172 };
 173
 174 static int zynqmp_qspi_ofdata_to_platdata(struct udevice *bus)
 175 {
 176         struct zynqmp_qspi_platdata *plat = bus->platdata;
 177
 178         debug("%s\n", __func__);
 179
 180         plat->regs = (struct zynqmp_qspi_regs *)(devfdt_get_addr(bus) +
 181                                                  GQSPI_REG_OFFSET);
 182         plat->dma_regs = (struct zynqmp_qspi_dma_regs *)
 183                           (devfdt_get_addr(bus) + GQSPI_DMA_REG_OFFSET);
 184
 185         return 0;
 186 }
 187
 188 static void zynqmp_qspi_init_hw(struct zynqmp_qspi_priv *priv)
 189 {
 190         u32 config_reg;
 191         struct zynqmp_qspi_regs *regs = priv->regs;
 192
 193         writel(GQSPI_GFIFO_SELECT, &regs->gqspisel);
 194         writel(GQSPI_GFIFO_ALL_INT_MASK, &regs->idisr);
 195         writel(GQSPI_FIFO_THRESHOLD, &regs->txftr);
 196         writel(GQSPI_FIFO_THRESHOLD, &regs->rxftr);
 197         writel(GQSPI_GFIFO_ALL_INT_MASK, &regs->isr);
 198
 199         config_reg = readl(&regs->confr);
 200         config_reg &= ~(GQSPI_GFIFO_STRT_MODE_MASK |
 201                         GQSPI_CONFIG_MODE_EN_MASK);
 202         config_reg |= GQSPI_CONFIG_DMA_MODE |
 203                       GQSPI_GFIFO_WP_HOLD |
 204                       GQSPI_DFLT_BAUD_RATE_DIV;
 205         writel(config_reg, &regs->confr);
 206
 207         writel(GQSPI_ENABLE_ENABLE_MASK, &regs->enbr);
 208 }
 209
 210 static u32 zynqmp_qspi_bus_select(struct zynqmp_qspi_priv *priv)
 211 {
 212         u32 gqspi_fifo_reg = 0;
 213
 214         gqspi_fifo_reg = GQSPI_GFIFO_LOW_BUS |
 215                          GQSPI_GFIFO_CS_LOWER;
 216
 217         return gqspi_fifo_reg;
 218 }
 219
 220 static void zynqmp_qspi_fill_gen_fifo(struct zynqmp_qspi_priv *priv,
 221                                       u32 gqspi_fifo_reg)
 222 {
 223         struct zynqmp_qspi_regs *regs = priv->regs;
 224         int ret = 0;
 225
 226         ret = wait_for_bit_le32(&regs->isr, GQSPI_IXR_GFEMTY_MASK, 1,
 227                                 GQSPI_TIMEOUT, 1);
 228         if (ret)
 229                 printf("%s Timeout\n", __func__);
 230
 231         writel(gqspi_fifo_reg, &regs->genfifo);
 232 }
 233
 234 static void zynqmp_qspi_chipselect(struct zynqmp_qspi_priv *priv, int is_on)
 235 {
 236         u32 gqspi_fifo_reg = 0;
 237
 238         if (is_on) {
 239                 gqspi_fifo_reg = zynqmp_qspi_bus_select(priv);
 240                 gqspi_fifo_reg |= GQSPI_SPI_MODE_SPI |
 241                                   GQSPI_IMD_DATA_CS_ASSERT;
 242         } else {
 243                 gqspi_fifo_reg = GQSPI_GFIFO_LOW_BUS;
 244                 gqspi_fifo_reg |= GQSPI_IMD_DATA_CS_DEASSERT;
 245         }
 246
 247         debug("GFIFO_CMD_CS: 0x%x\n", gqspi_fifo_reg);
 248
 249         zynqmp_qspi_fill_gen_fifo(priv, gqspi_fifo_reg);
 250 }
 251
 252 void zynqmp_qspi_set_tapdelay(struct udevice *bus, u32 baudrateval)
 253 {
 254         struct zynqmp_qspi_platdata *plat = bus->platdata;
 255         struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
 256         struct zynqmp_qspi_regs *regs = priv->regs;
 257         u32 tapdlybypass = 0, lpbkdlyadj = 0, datadlyadj = 0, clk_rate;
 258         u32 reqhz = 0;
 259
 260         clk_rate = plat->frequency;
 261         reqhz = (clk_rate / (GQSPI_BAUD_DIV_SHIFT << baudrateval));
 262
 263         debug("%s, req_hz:%d, clk_rate:%d, baudrateval:%d\n",
 264               __func__, reqhz, clk_rate, baudrateval);
 265
 266         if (reqhz < GQSPI_FREQ_40MHZ) {
 267                 zynqmp_mmio_read(IOU_TAPDLY_BYPASS_OFST, &tapdlybypass);
 268                 tapdlybypass |= (TAP_DLY_BYPASS_LQSPI_RX_VALUE <<
 269                                 TAP_DLY_BYPASS_LQSPI_RX_SHIFT);
 270         } else if (reqhz < GQSPI_FREQ_100MHZ) {
 271                 zynqmp_mmio_read(IOU_TAPDLY_BYPASS_OFST, &tapdlybypass);
 272                 tapdlybypass |= (TAP_DLY_BYPASS_LQSPI_RX_VALUE <<
 273                                 TAP_DLY_BYPASS_LQSPI_RX_SHIFT);
 274                 lpbkdlyadj = readl(&regs->lpbkdly);
 275                 lpbkdlyadj |= (GQSPI_LPBK_DLY_ADJ_LPBK_MASK);
 276                 datadlyadj = readl(&regs->gqspidlyadj);
 277                 datadlyadj |= ((GQSPI_USE_DATA_DLY << GQSPI_USE_DATA_DLY_SHIFT)
 278                                 | (GQSPI_DATA_DLY_ADJ_VALUE <<
 279                                         GQSPI_DATA_DLY_ADJ_SHIFT));
 280         } else if (reqhz < GQSPI_FREQ_150MHZ) {
 281                 lpbkdlyadj = readl(&regs->lpbkdly);
 282                 lpbkdlyadj |= ((GQSPI_LPBK_DLY_ADJ_LPBK_MASK) |
 283                                 GQSPI_LPBK_DLY_ADJ_DLY_0);
 284         }
 285
 286         zynqmp_mmio_write(IOU_TAPDLY_BYPASS_OFST, IOU_TAPDLY_BYPASS_MASK,
 287                           tapdlybypass);
 288         writel(lpbkdlyadj, &regs->lpbkdly);
 289         writel(datadlyadj, &regs->gqspidlyadj);
 290 }
 291
 292 static int zynqmp_qspi_set_speed(struct udevice *bus, uint speed)
 293 {
 294         struct zynqmp_qspi_platdata *plat = bus->platdata;
 295         struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
 296         struct zynqmp_qspi_regs *regs = priv->regs;
 297         u32 confr;
 298         u8 baud_rate_val = 0;
 299
 300         debug("%s\n", __func__);
 301         if (speed > plat->frequency)
 302                 speed = plat->frequency;
 303
 304         /* Set the clock frequency */
 305         confr = readl(&regs->confr);
 306         if (speed == 0) {
 307                 /* Set baudrate x8, if the freq is 0 */
 308                 baud_rate_val = GQSPI_DFLT_BAUD_RATE_VAL;
 309         } else if (plat->speed_hz != speed) {
 310                 while ((baud_rate_val < 8) &&
 311                        ((plat->frequency /
 312                        (2 << baud_rate_val)) > speed))
 313                         baud_rate_val++;
 314
 315                 if (baud_rate_val > GQSPI_MAX_BAUD_RATE_VAL)
 316                         baud_rate_val = GQSPI_DFLT_BAUD_RATE_VAL;
 317
 318                 plat->speed_hz = plat->frequency / (2 << baud_rate_val);
 319         }
 320         confr &= ~GQSPI_BAUD_DIV_MASK;
 321         confr |= (baud_rate_val << 3);
 322         writel(confr, &regs->confr);
 323
 324         zynqmp_qspi_set_tapdelay(bus, baud_rate_val);
 325         debug("regs=%p, speed=%d\n", priv->regs, plat->speed_hz);
 326
 327         return 0;
 328 }
 329
 330 static int zynqmp_qspi_probe(struct udevice *bus)
 331 {
 332         struct zynqmp_qspi_platdata *plat = dev_get_platdata(bus);
 333         struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
 334         struct clk clk;
 335         unsigned long clock;
 336         int ret;
 337
 338         debug("%s: bus:%p, priv:%p\n", __func__, bus, priv);
 339
 340         priv->regs = plat->regs;
 341         priv->dma_regs = plat->dma_regs;
 342
 343         ret = clk_get_by_index(bus, 0, &clk);
 344         if (ret < 0) {
 345                 dev_err(dev, "failed to get clock\n");
 346                 return ret;
 347         }
 348
 349         clock = clk_get_rate(&clk);
 350         if (IS_ERR_VALUE(clock)) {
 351                 dev_err(dev, "failed to get rate\n");
 352                 return clock;
 353         }
 354         debug("%s: CLK %ld\n", __func__, clock);
 355
 356         ret = clk_enable(&clk);
 357         if (ret && ret != -ENOSYS) {
 358                 dev_err(dev, "failed to enable clock\n");
 359                 return ret;
 360         }
 361         plat->frequency = clock;
 362         plat->speed_hz = plat->frequency / 2;
 363
 364         /* init the zynq spi hw */
 365         zynqmp_qspi_init_hw(priv);
 366
 367         return 0;
 368 }
 369
 370 static int zynqmp_qspi_set_mode(struct udevice *bus, uint mode)
 371 {
 372         struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
 373         struct zynqmp_qspi_regs *regs = priv->regs;
 374         u32 confr;
 375
 376         debug("%s\n", __func__);
 377         /* Set the SPI Clock phase and polarities */
 378         confr = readl(&regs->confr);
 379         confr &= ~(GQSPI_CONFIG_CPHA_MASK |
 380                    GQSPI_CONFIG_CPOL_MASK);
 381
 382         if (mode & SPI_CPHA)
 383                 confr |= GQSPI_CONFIG_CPHA_MASK;
 384         if (mode & SPI_CPOL)
 385                 confr |= GQSPI_CONFIG_CPOL_MASK;
 386
 387         writel(confr, &regs->confr);
 388
 389         return 0;
 390 }
 391
 392 static int zynqmp_qspi_fill_tx_fifo(struct zynqmp_qspi_priv *priv, u32 size)
 393 {
 394         u32 data;
 395         int ret = 0;
 396         struct zynqmp_qspi_regs *regs = priv->regs;
 397         u32 *buf = (u32 *)priv->tx_buf;
 398         u32 len = size;
 399
 400         debug("TxFIFO: 0x%x, size: 0x%x\n", readl(&regs->isr),
 401               size);
 402
 403         while (size) {
 404                 ret = wait_for_bit_le32(&regs->isr, GQSPI_IXR_TXNFULL_MASK, 1,
 405                                         GQSPI_TIMEOUT, 1);
 406                 if (ret) {
 407                         printf("%s: Timeout\n", __func__);
 408                         return ret;
 409                 }
 410
 411                 if (size >= 4) {
 412                         writel(*buf, &regs->txd0r);
 413                         buf++;
 414                         size -= 4;
 415                 } else {
 416                         switch (size) {
 417                         case 1:
 418                                 data = *((u8 *)buf);
 419                                 buf += 1;
 420                                 data |= GENMASK(31, 8);
 421                                 break;
 422                         case 2:
 423                                 data = *((u16 *)buf);
 424                                 buf += 2;
 425                                 data |= GENMASK(31, 16);
 426                                 break;
 427                         case 3:
 428                                 data = *((u16 *)buf);
 429                                 buf += 2;
 430                                 data |= (*((u8 *)buf) << 16);
 431                                 buf += 1;
 432                                 data |= GENMASK(31, 24);
 433                                 break;
 434                         }
 435                         writel(data, &regs->txd0r);
 436                         size = 0;
 437                 }
 438         }
 439
 440         priv->tx_buf += len;
 441         return 0;
 442 }
 443
 444 static void zynqmp_qspi_genfifo_cmd(struct zynqmp_qspi_priv *priv)
 445 {
 446         u32 gen_fifo_cmd;
 447         u32 bytecount = 0;
 448
 449         while (priv->len) {
 450                 gen_fifo_cmd = zynqmp_qspi_bus_select(priv);
 451                 gen_fifo_cmd |= GQSPI_GFIFO_TX | GQSPI_SPI_MODE_SPI;
 452                 gen_fifo_cmd |= *(u8 *)priv->tx_buf;
 453                 bytecount++;
 454                 priv->len--;
 455                 priv->tx_buf = (u8 *)priv->tx_buf + 1;
 456
 457                 debug("GFIFO_CMD_Cmd = 0x%x\n", gen_fifo_cmd);
 458
 459                 zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
 460         }
 461 }
 462
 463 static u32 zynqmp_qspi_calc_exp(struct zynqmp_qspi_priv *priv,
 464                                 u32 *gen_fifo_cmd)
 465 {
 466         u32 expval = 8;
 467         u32 len;
 468
 469         while (1) {
 470                 if (priv->len > 255) {
 471                         if (priv->len & (1 << expval)) {
 472                                 *gen_fifo_cmd &= ~GQSPI_GFIFO_IMD_MASK;
 473                                 *gen_fifo_cmd |= GQSPI_GFIFO_EXP_MASK;
 474                                 *gen_fifo_cmd |= expval;
 475                                 priv->len -= (1 << expval);
 476                                 return expval;
 477                         }
 478                         expval++;
 479                 } else {
 480                         *gen_fifo_cmd &= ~(GQSPI_GFIFO_IMD_MASK |
 481                                           GQSPI_GFIFO_EXP_MASK);
 482                         *gen_fifo_cmd |= (u8)priv->len;
 483                         len = (u8)priv->len;
 484                         priv->len  = 0;
 485                         return len;
 486                 }
 487         }
 488 }
 489
 490 static int zynqmp_qspi_genfifo_fill_tx(struct zynqmp_qspi_priv *priv)
 491 {
 492         u32 gen_fifo_cmd;
 493         u32 len;
 494         int ret = 0;
 495
 496         gen_fifo_cmd = zynqmp_qspi_bus_select(priv);
 497         gen_fifo_cmd |= GQSPI_GFIFO_TX |
 498                         GQSPI_GFIFO_DATA_XFR_MASK;
 499
 500         gen_fifo_cmd |= GQSPI_SPI_MODE_SPI;
 501
 502         while (priv->len) {
 503                 len = zynqmp_qspi_calc_exp(priv, &gen_fifo_cmd);
 504                 zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
 505
 506                 debug("GFIFO_CMD_TX:0x%x\n", gen_fifo_cmd);
 507
 508                 if (gen_fifo_cmd & GQSPI_GFIFO_EXP_MASK)
 509                         ret = zynqmp_qspi_fill_tx_fifo(priv,
 510                                                        1 << len);
 511                 else
 512                         ret = zynqmp_qspi_fill_tx_fifo(priv,
 513                                                        len);
 514
 515                 if (ret)
 516                         return ret;
 517         }
 518         return ret;
 519 }
 520
 521 static int zynqmp_qspi_start_dma(struct zynqmp_qspi_priv *priv,
 522                                  u32 gen_fifo_cmd, u32 *buf)
 523 {
 524         u32 addr;
 525         u32 size, len;
 526         u32 actuallen = priv->len;
 527         int ret = 0;
 528         struct zynqmp_qspi_dma_regs *dma_regs = priv->dma_regs;
 529
 530         writel((unsigned long)buf, &dma_regs->dmadst);
 531         writel(roundup(priv->len, ARCH_DMA_MINALIGN), &dma_regs->dmasize);
 532         writel(GQSPI_DMA_DST_I_STS_MASK, &dma_regs->dmaier);
 533         addr = (unsigned long)buf;
 534         size = roundup(priv->len, ARCH_DMA_MINALIGN);
 535         flush_dcache_range(addr, addr + size);
 536
 537         while (priv->len) {
 538                 len = zynqmp_qspi_calc_exp(priv, &gen_fifo_cmd);
 539                 if (!(gen_fifo_cmd & GQSPI_GFIFO_EXP_MASK) &&
 540                     (len % ARCH_DMA_MINALIGN)) {
 541                         gen_fifo_cmd &= ~GENMASK(7, 0);
 542                         gen_fifo_cmd |= roundup(len, ARCH_DMA_MINALIGN);
 543                 }
 544                 zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
 545
 546                 debug("GFIFO_CMD_RX:0x%x\n", gen_fifo_cmd);
 547         }
 548
 549         ret = wait_for_bit_le32(&dma_regs->dmaisr, GQSPI_DMA_DST_I_STS_DONE,
 550                                 1, GQSPI_TIMEOUT, 1);
 551         if (ret) {
 552                 printf("DMA Timeout:0x%x\n", readl(&dma_regs->dmaisr));
 553                 return -ETIMEDOUT;
 554         }
 555
 556         writel(GQSPI_DMA_DST_I_STS_DONE, &dma_regs->dmaisr);
 557
 558         debug("buf:0x%lx, rxbuf:0x%lx, *buf:0x%x len: 0x%x\n",
 559               (unsigned long)buf, (unsigned long)priv->rx_buf, *buf,
 560               actuallen);
 561
 562         if (buf != priv->rx_buf)
 563                 memcpy(priv->rx_buf, buf, actuallen);
 564
 565         return 0;
 566 }
 567
 568 static int zynqmp_qspi_genfifo_fill_rx(struct zynqmp_qspi_priv *priv)
 569 {
 570         u32 gen_fifo_cmd;
 571         u32 *buf;
 572         u32 actuallen = priv->len;
 573
 574         gen_fifo_cmd = zynqmp_qspi_bus_select(priv);
 575         gen_fifo_cmd |= GQSPI_GFIFO_RX |
 576                         GQSPI_GFIFO_DATA_XFR_MASK;
 577
 578         gen_fifo_cmd |= GQSPI_SPI_MODE_SPI;
 579
 580         /*
 581          * Check if receive buffer is aligned to 4 byte and length
 582          * is multiples of four byte as we are using dma to receive.
 583          */
 584         if (!((unsigned long)priv->rx_buf & (GQSPI_DMA_ALIGN - 1)) &&
 585             !(actuallen % GQSPI_DMA_ALIGN)) {
 586                 buf = (u32 *)priv->rx_buf;
 587                 return zynqmp_qspi_start_dma(priv, gen_fifo_cmd, buf);
 588         }
 589
 590         ALLOC_CACHE_ALIGN_BUFFER(u8, tmp, roundup(priv->len,
 591                                                   GQSPI_DMA_ALIGN));
 592         buf = (u32 *)tmp;
 593         return zynqmp_qspi_start_dma(priv, gen_fifo_cmd, buf);
 594 }
 595
 596 static int zynqmp_qspi_start_transfer(struct zynqmp_qspi_priv *priv)
 597 {
 598         int ret = 0;
 599
 600         if (priv->is_inst) {
 601                 if (priv->tx_buf)
 602                         zynqmp_qspi_genfifo_cmd(priv);
 603                 else
 604                         return -EINVAL;
 605         } else {
 606                 if (priv->tx_buf)
 607                         ret = zynqmp_qspi_genfifo_fill_tx(priv);
 608                 else if (priv->rx_buf)
 609                         ret = zynqmp_qspi_genfifo_fill_rx(priv);
 610                 else
 611                         return -EINVAL;
 612         }
 613         return ret;
 614 }
 615
 616 static int zynqmp_qspi_transfer(struct zynqmp_qspi_priv *priv)
 617 {
 618         static unsigned int cs_change = 1;
 619         int status = 0;
 620
 621         debug("%s\n", __func__);
 622
 623         while (1) {
 624                 /* Select the chip if required */
 625                 if (cs_change)
 626                         zynqmp_qspi_chipselect(priv, 1);
 627
 628                 cs_change = priv->cs_change;
 629
 630                 if (!priv->tx_buf && !priv->rx_buf && priv->len) {
 631                         status = -EINVAL;
 632                         break;
 633                 }
 634
 635                 /* Request the transfer */
 636                 if (priv->len) {
 637                         status = zynqmp_qspi_start_transfer(priv);
 638                         priv->is_inst = 0;
 639                         if (status < 0)
 640                                 break;
 641                 }
 642
 643                 if (cs_change)
 644                         /* Deselect the chip */
 645                         zynqmp_qspi_chipselect(priv, 0);
 646                 break;
 647         }
 648
 649         return status;
 650 }
 651
 652 static int zynqmp_qspi_claim_bus(struct udevice *dev)
 653 {
 654         struct udevice *bus = dev->parent;
 655         struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
 656         struct zynqmp_qspi_regs *regs = priv->regs;
 657
 658         writel(GQSPI_ENABLE_ENABLE_MASK, &regs->enbr);
 659
 660         return 0;
 661 }
 662
 663 static int zynqmp_qspi_release_bus(struct udevice *dev)
 664 {
 665         struct udevice *bus = dev->parent;
 666         struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
 667         struct zynqmp_qspi_regs *regs = priv->regs;
 668
 669         writel(~GQSPI_ENABLE_ENABLE_MASK, &regs->enbr);
 670
 671         return 0;
 672 }
 673
 674 int zynqmp_qspi_xfer(struct udevice *dev, unsigned int bitlen, const void *dout,
 675                      void *din, unsigned long flags)
 676 {
 677         struct udevice *bus = dev->parent;
 678         struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
 679
 680         debug("%s: priv: 0x%08lx bitlen: %d dout: 0x%08lx ", __func__,
 681               (unsigned long)priv, bitlen, (unsigned long)dout);
 682         debug("din: 0x%08lx flags: 0x%lx\n", (unsigned long)din, flags);
 683
 684         priv->tx_buf = dout;
 685         priv->rx_buf = din;
 686         priv->len = bitlen / 8;
 687
 688         /*
 689          * Assume that the beginning of a transfer with bits to
 690          * transmit must contain a device command.
 691          */
 692         if (dout && flags & SPI_XFER_BEGIN)
 693                 priv->is_inst = 1;
 694         else
 695                 priv->is_inst = 0;
 696
 697         if (flags & SPI_XFER_END)
 698                 priv->cs_change = 1;
 699         else
 700                 priv->cs_change = 0;
 701
 702         zynqmp_qspi_transfer(priv);
 703
 704         return 0;
 705 }
 706
 707 static const struct dm_spi_ops zynqmp_qspi_ops = {
 708         .claim_bus      = zynqmp_qspi_claim_bus,
 709         .release_bus    = zynqmp_qspi_release_bus,
 710         .xfer           = zynqmp_qspi_xfer,
 711         .set_speed      = zynqmp_qspi_set_speed,
 712         .set_mode       = zynqmp_qspi_set_mode,
 713 };
 714
 715 static const struct udevice_id zynqmp_qspi_ids[] = {
 716         { .compatible = "xlnx,zynqmp-qspi-1.0" },
 717         { }
 718 };
 719
 720 U_BOOT_DRIVER(zynqmp_qspi) = {
 721         .name   = "zynqmp_qspi",
 722         .id     = UCLASS_SPI,
 723         .of_match = zynqmp_qspi_ids,
 724         .ops    = &zynqmp_qspi_ops,
 725         .ofdata_to_platdata = zynqmp_qspi_ofdata_to_platdata,
 726         .platdata_auto_alloc_size = sizeof(struct zynqmp_qspi_platdata),
 727         .priv_auto_alloc_size = sizeof(struct zynqmp_qspi_priv),
 728         .probe  = zynqmp_qspi_probe,
 729 };