drivers/spi/spi-zynqmp-gqspi.c

   1 /*
   2  * Xilinx Zynq UltraScale+ MPSoC Quad-SPI (QSPI) controller driver
   3  * (master mode only)
   4  *
   5  * Copyright (C) 2009 - 2015 Xilinx, Inc.
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published
   9  * by the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  */
  12
  13 #include <linux/clk.h>
  14 #include <linux/delay.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/dmaengine.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/io.h>
  19 #include <linux/module.h>
  20 #include <linux/of_irq.h>
  21 #include <linux/of_address.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/spi/spi.h>
  24 #include <linux/spinlock.h>
  25 #include <linux/workqueue.h>
  26
  27 /* Generic QSPI register offsets */
  28 #define GQSPI_CONFIG_OFST               0x00000100
  29 #define GQSPI_ISR_OFST                  0x00000104
  30 #define GQSPI_IDR_OFST                  0x0000010C
  31 #define GQSPI_IER_OFST                  0x00000108
  32 #define GQSPI_IMASK_OFST                0x00000110
  33 #define GQSPI_EN_OFST                   0x00000114
  34 #define GQSPI_TXD_OFST                  0x0000011C
  35 #define GQSPI_RXD_OFST                  0x00000120
  36 #define GQSPI_TX_THRESHOLD_OFST         0x00000128
  37 #define GQSPI_RX_THRESHOLD_OFST         0x0000012C
  38 #define GQSPI_LPBK_DLY_ADJ_OFST         0x00000138
  39 #define GQSPI_GEN_FIFO_OFST             0x00000140
  40 #define GQSPI_SEL_OFST                  0x00000144
  41 #define GQSPI_GF_THRESHOLD_OFST         0x00000150
  42 #define GQSPI_FIFO_CTRL_OFST            0x0000014C
  43 #define GQSPI_QSPIDMA_DST_CTRL_OFST     0x0000080C
  44 #define GQSPI_QSPIDMA_DST_SIZE_OFST     0x00000804
  45 #define GQSPI_QSPIDMA_DST_STS_OFST      0x00000808
  46 #define GQSPI_QSPIDMA_DST_I_STS_OFST    0x00000814
  47 #define GQSPI_QSPIDMA_DST_I_EN_OFST     0x00000818
  48 #define GQSPI_QSPIDMA_DST_I_DIS_OFST    0x0000081C
  49 #define GQSPI_QSPIDMA_DST_I_MASK_OFST   0x00000820
  50 #define GQSPI_QSPIDMA_DST_ADDR_OFST     0x00000800
  51 #define GQSPI_QSPIDMA_DST_ADDR_MSB_OFST 0x00000828
  52
  53 /* GQSPI register bit masks */
  54 #define GQSPI_SEL_MASK                          0x00000001
  55 #define GQSPI_EN_MASK                           0x00000001
  56 #define GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK        0x00000020
  57 #define GQSPI_ISR_WR_TO_CLR_MASK                0x00000002
  58 #define GQSPI_IDR_ALL_MASK                      0x00000FBE
  59 #define GQSPI_CFG_MODE_EN_MASK                  0xC0000000
  60 #define GQSPI_CFG_GEN_FIFO_START_MODE_MASK      0x20000000
  61 #define GQSPI_CFG_ENDIAN_MASK                   0x04000000
  62 #define GQSPI_CFG_EN_POLL_TO_MASK               0x00100000
  63 #define GQSPI_CFG_WP_HOLD_MASK                  0x00080000
  64 #define GQSPI_CFG_BAUD_RATE_DIV_MASK            0x00000038
  65 #define GQSPI_CFG_CLK_PHA_MASK                  0x00000004
  66 #define GQSPI_CFG_CLK_POL_MASK                  0x00000002
  67 #define GQSPI_CFG_START_GEN_FIFO_MASK           0x10000000
  68 #define GQSPI_GENFIFO_IMM_DATA_MASK             0x000000FF
  69 #define GQSPI_GENFIFO_DATA_XFER                 0x00000100
  70 #define GQSPI_GENFIFO_EXP                       0x00000200
  71 #define GQSPI_GENFIFO_MODE_SPI                  0x00000400
  72 #define GQSPI_GENFIFO_MODE_DUALSPI              0x00000800
  73 #define GQSPI_GENFIFO_MODE_QUADSPI              0x00000C00
  74 #define GQSPI_GENFIFO_MODE_MASK                 0x00000C00
  75 #define GQSPI_GENFIFO_CS_LOWER                  0x00001000
  76 #define GQSPI_GENFIFO_CS_UPPER                  0x00002000
  77 #define GQSPI_GENFIFO_BUS_LOWER                 0x00004000
  78 #define GQSPI_GENFIFO_BUS_UPPER                 0x00008000
  79 #define GQSPI_GENFIFO_BUS_BOTH                  0x0000C000
  80 #define GQSPI_GENFIFO_BUS_MASK                  0x0000C000
  81 #define GQSPI_GENFIFO_TX                        0x00010000
  82 #define GQSPI_GENFIFO_RX                        0x00020000
  83 #define GQSPI_GENFIFO_STRIPE                    0x00040000
  84 #define GQSPI_GENFIFO_POLL                      0x00080000
  85 #define GQSPI_GENFIFO_EXP_START                 0x00000100
  86 #define GQSPI_FIFO_CTRL_RST_RX_FIFO_MASK        0x00000004
  87 #define GQSPI_FIFO_CTRL_RST_TX_FIFO_MASK        0x00000002
  88 #define GQSPI_FIFO_CTRL_RST_GEN_FIFO_MASK       0x00000001
  89 #define GQSPI_ISR_RXEMPTY_MASK                  0x00000800
  90 #define GQSPI_ISR_GENFIFOFULL_MASK              0x00000400
  91 #define GQSPI_ISR_GENFIFONOT_FULL_MASK          0x00000200
  92 #define GQSPI_ISR_TXEMPTY_MASK                  0x00000100
  93 #define GQSPI_ISR_GENFIFOEMPTY_MASK             0x00000080
  94 #define GQSPI_ISR_RXFULL_MASK                   0x00000020
  95 #define GQSPI_ISR_RXNEMPTY_MASK                 0x00000010
  96 #define GQSPI_ISR_TXFULL_MASK                   0x00000008
  97 #define GQSPI_ISR_TXNOT_FULL_MASK               0x00000004
  98 #define GQSPI_ISR_POLL_TIME_EXPIRE_MASK         0x00000002
  99 #define GQSPI_IER_TXNOT_FULL_MASK               0x00000004
 100 #define GQSPI_IER_RXEMPTY_MASK                  0x00000800
 101 #define GQSPI_IER_POLL_TIME_EXPIRE_MASK         0x00000002
 102 #define GQSPI_IER_RXNEMPTY_MASK                 0x00000010
 103 #define GQSPI_IER_GENFIFOEMPTY_MASK             0x00000080
 104 #define GQSPI_IER_TXEMPTY_MASK                  0x00000100
 105 #define GQSPI_QSPIDMA_DST_INTR_ALL_MASK         0x000000FE
 106 #define GQSPI_QSPIDMA_DST_STS_WTC               0x0000E000
 107 #define GQSPI_CFG_MODE_EN_DMA_MASK              0x80000000
 108 #define GQSPI_ISR_IDR_MASK                      0x00000994
 109 #define GQSPI_QSPIDMA_DST_I_EN_DONE_MASK        0x00000002
 110 #define GQSPI_QSPIDMA_DST_I_STS_DONE_MASK       0x00000002
 111 #define GQSPI_IRQ_MASK                          0x00000980
 112
 113 #define GQSPI_CFG_BAUD_RATE_DIV_SHIFT           3
 114 #define GQSPI_GENFIFO_CS_SETUP                  0x4
 115 #define GQSPI_GENFIFO_CS_HOLD                   0x3
 116 #define GQSPI_TXD_DEPTH                         64
 117 #define GQSPI_RX_FIFO_THRESHOLD                 32
 118 #define GQSPI_RX_FIFO_FILL      (GQSPI_RX_FIFO_THRESHOLD * 4)
 119 #define GQSPI_TX_FIFO_THRESHOLD_RESET_VAL       32
 120 #define GQSPI_TX_FIFO_FILL      (GQSPI_TXD_DEPTH -\
 121                                 GQSPI_TX_FIFO_THRESHOLD_RESET_VAL)
 122 #define GQSPI_GEN_FIFO_THRESHOLD_RESET_VAL      0X10
 123 #define GQSPI_QSPIDMA_DST_CTRL_RESET_VAL        0x803FFA00
 124 #define GQSPI_SELECT_FLASH_CS_LOWER             0x1
 125 #define GQSPI_SELECT_FLASH_CS_UPPER             0x2
 126 #define GQSPI_SELECT_FLASH_CS_BOTH              0x3
 127 #define GQSPI_SELECT_FLASH_BUS_LOWER            0x1
 128 #define GQSPI_SELECT_FLASH_BUS_UPPER            0x2
 129 #define GQSPI_SELECT_FLASH_BUS_BOTH             0x3
 130 #define GQSPI_BAUD_DIV_MAX      7       /* Baud rate divisor maximum */
 131 #define GQSPI_BAUD_DIV_SHIFT    2       /* Baud rate divisor shift */
 132 #define GQSPI_SELECT_MODE_SPI           0x1
 133 #define GQSPI_SELECT_MODE_DUALSPI       0x2
 134 #define GQSPI_SELECT_MODE_QUADSPI       0x4
 135 #define GQSPI_DMA_UNALIGN               0x3
 136 #define GQSPI_DEFAULT_NUM_CS    1       /* Default number of chip selects */
 137
 138 enum mode_type {GQSPI_MODE_IO, GQSPI_MODE_DMA};
 139
 140 /**
 141  * struct zynqmp_qspi - Defines qspi driver instance
 142  * @regs:               Virtual address of the QSPI controller registers
 143  * @refclk:             Pointer to the peripheral clock
 144  * @pclk:               Pointer to the APB clock
 145  * @irq:                IRQ number
 146  * @dev:                Pointer to struct device
 147  * @txbuf:              Pointer to the TX buffer
 148  * @rxbuf:              Pointer to the RX buffer
 149  * @bytes_to_transfer:  Number of bytes left to transfer
 150  * @bytes_to_receive:   Number of bytes left to receive
 151  * @genfifocs:          Used for chip select
 152  * @genfifobus:         Used to select the upper or lower bus
 153  * @dma_rx_bytes:       Remaining bytes to receive by DMA mode
 154  * @dma_addr:           DMA address after mapping the kernel buffer
 155  * @genfifoentry:       Used for storing the genfifoentry instruction.
 156  * @mode:               Defines the mode in which QSPI is operating
 157  */
 158 struct zynqmp_qspi {
 159         void __iomem *regs;
 160         struct clk *refclk;
 161         struct clk *pclk;
 162         int irq;
 163         struct device *dev;
 164         const void *txbuf;
 165         void *rxbuf;
 166         int bytes_to_transfer;
 167         int bytes_to_receive;
 168         u32 genfifocs;
 169         u32 genfifobus;
 170         u32 dma_rx_bytes;
 171         dma_addr_t dma_addr;
 172         u32 genfifoentry;
 173         enum mode_type mode;
 174 };
 175
 176 /**
 177  * zynqmp_gqspi_read:   For GQSPI controller read operation
 178  * @xqspi:      Pointer to the zynqmp_qspi structure
 179  * @offset:     Offset from where to read
 180  */
 181 static u32 zynqmp_gqspi_read(struct zynqmp_qspi *xqspi, u32 offset)
 182 {
 183         return readl_relaxed(xqspi->regs + offset);
 184 }
 185
 186 /**
 187  * zynqmp_gqspi_write:  For GQSPI controller write operation
 188  * @xqspi:      Pointer to the zynqmp_qspi structure
 189  * @offset:     Offset where to write
 190  * @val:        Value to be written
 191  */
 192 static inline void zynqmp_gqspi_write(struct zynqmp_qspi *xqspi, u32 offset,
 193                                       u32 val)
 194 {
 195         writel_relaxed(val, (xqspi->regs + offset));
 196 }
 197
 198 /**
 199  * zynqmp_gqspi_selectslave:    For selection of slave device
 200  * @instanceptr:        Pointer to the zynqmp_qspi structure
 201  * @flashcs:    For chip select
 202  * @flashbus:   To check which bus is selected- upper or lower
 203  */
 204 static void zynqmp_gqspi_selectslave(struct zynqmp_qspi *instanceptr,
 205                                      u8 slavecs, u8 slavebus)
 206 {
 207         /*
 208          * Bus and CS lines selected here will be updated in the instance and
 209          * used for subsequent GENFIFO entries during transfer.
 210          */
 211
 212         /* Choose slave select line */
 213         switch (slavecs) {
 214         case GQSPI_SELECT_FLASH_CS_BOTH:
 215                 instanceptr->genfifocs = GQSPI_GENFIFO_CS_LOWER |
 216                         GQSPI_GENFIFO_CS_UPPER;
 217                 break;
 218         case GQSPI_SELECT_FLASH_CS_UPPER:
 219                 instanceptr->genfifocs = GQSPI_GENFIFO_CS_UPPER;
 220                 break;
 221         case GQSPI_SELECT_FLASH_CS_LOWER:
 222                 instanceptr->genfifocs = GQSPI_GENFIFO_CS_LOWER;
 223                 break;
 224         default:
 225                 dev_warn(instanceptr->dev, "Invalid slave select\n");
 226         }
 227
 228         /* Choose the bus */
 229         switch (slavebus) {
 230         case GQSPI_SELECT_FLASH_BUS_BOTH:
 231                 instanceptr->genfifobus = GQSPI_GENFIFO_BUS_LOWER |
 232                         GQSPI_GENFIFO_BUS_UPPER;
 233                 break;
 234         case GQSPI_SELECT_FLASH_BUS_UPPER:
 235                 instanceptr->genfifobus = GQSPI_GENFIFO_BUS_UPPER;
 236                 break;
 237         case GQSPI_SELECT_FLASH_BUS_LOWER:
 238                 instanceptr->genfifobus = GQSPI_GENFIFO_BUS_LOWER;
 239                 break;
 240         default:
 241                 dev_warn(instanceptr->dev, "Invalid slave bus\n");
 242         }
 243 }
 244
 245 /**
 246  * zynqmp_qspi_init_hw: Initialize the hardware
 247  * @xqspi:      Pointer to the zynqmp_qspi structure
 248  *
 249  * The default settings of the QSPI controller's configurable parameters on
 250  * reset are
 251  *      - Master mode
 252  *      - TX threshold set to 1
 253  *      - RX threshold set to 1
 254  *      - Flash memory interface mode enabled
 255  * This function performs the following actions
 256  *      - Disable and clear all the interrupts
 257  *      - Enable manual slave select
 258  *      - Enable manual start
 259  *      - Deselect all the chip select lines
 260  *      - Set the little endian mode of TX FIFO and
 261  *      - Enable the QSPI controller
 262  */
 263 static void zynqmp_qspi_init_hw(struct zynqmp_qspi *xqspi)
 264 {
 265         u32 config_reg;
 266
 267         /* Select the GQSPI mode */
 268         zynqmp_gqspi_write(xqspi, GQSPI_SEL_OFST, GQSPI_SEL_MASK);
 269         /* Clear and disable interrupts */
 270         zynqmp_gqspi_write(xqspi, GQSPI_ISR_OFST,
 271                            zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST) |
 272                            GQSPI_ISR_WR_TO_CLR_MASK);
 273         /* Clear the DMA STS */
 274         zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_I_STS_OFST,
 275                            zynqmp_gqspi_read(xqspi,
 276                                              GQSPI_QSPIDMA_DST_I_STS_OFST));
 277         zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_STS_OFST,
 278                            zynqmp_gqspi_read(xqspi,
 279                                              GQSPI_QSPIDMA_DST_STS_OFST) |
 280                                              GQSPI_QSPIDMA_DST_STS_WTC);
 281         zynqmp_gqspi_write(xqspi, GQSPI_IDR_OFST, GQSPI_IDR_ALL_MASK);
 282         zynqmp_gqspi_write(xqspi,
 283                            GQSPI_QSPIDMA_DST_I_DIS_OFST,
 284                            GQSPI_QSPIDMA_DST_INTR_ALL_MASK);
 285         /* Disable the GQSPI */
 286         zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0);
 287         config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
 288         config_reg &= ~GQSPI_CFG_MODE_EN_MASK;
 289         /* Manual start */
 290         config_reg |= GQSPI_CFG_GEN_FIFO_START_MODE_MASK;
 291         /* Little endian by default */
 292         config_reg &= ~GQSPI_CFG_ENDIAN_MASK;
 293         /* Disable poll time out */
 294         config_reg &= ~GQSPI_CFG_EN_POLL_TO_MASK;
 295         /* Set hold bit */
 296         config_reg |= GQSPI_CFG_WP_HOLD_MASK;
 297         /* Clear pre-scalar by default */
 298         config_reg &= ~GQSPI_CFG_BAUD_RATE_DIV_MASK;
 299         /* CPHA 0 */
 300         config_reg &= ~GQSPI_CFG_CLK_PHA_MASK;
 301         /* CPOL 0 */
 302         config_reg &= ~GQSPI_CFG_CLK_POL_MASK;
 303         zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
 304
 305         /* Clear the TX and RX FIFO */
 306         zynqmp_gqspi_write(xqspi, GQSPI_FIFO_CTRL_OFST,
 307                            GQSPI_FIFO_CTRL_RST_RX_FIFO_MASK |
 308                            GQSPI_FIFO_CTRL_RST_TX_FIFO_MASK |
 309                            GQSPI_FIFO_CTRL_RST_GEN_FIFO_MASK);
 310         /* Set by default to allow for high frequencies */
 311         zynqmp_gqspi_write(xqspi, GQSPI_LPBK_DLY_ADJ_OFST,
 312                            zynqmp_gqspi_read(xqspi, GQSPI_LPBK_DLY_ADJ_OFST) |
 313                            GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK);
 314         /* Reset thresholds */
 315         zynqmp_gqspi_write(xqspi, GQSPI_TX_THRESHOLD_OFST,
 316                            GQSPI_TX_FIFO_THRESHOLD_RESET_VAL);
 317         zynqmp_gqspi_write(xqspi, GQSPI_RX_THRESHOLD_OFST,
 318                            GQSPI_RX_FIFO_THRESHOLD);
 319         zynqmp_gqspi_write(xqspi, GQSPI_GF_THRESHOLD_OFST,
 320                            GQSPI_GEN_FIFO_THRESHOLD_RESET_VAL);
 321         zynqmp_gqspi_selectslave(xqspi,
 322                                  GQSPI_SELECT_FLASH_CS_LOWER,
 323                                  GQSPI_SELECT_FLASH_BUS_LOWER);
 324         /* Initialize DMA */
 325         zynqmp_gqspi_write(xqspi,
 326                         GQSPI_QSPIDMA_DST_CTRL_OFST,
 327                         GQSPI_QSPIDMA_DST_CTRL_RESET_VAL);
 328
 329         /* Enable the GQSPI */
 330         zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, GQSPI_EN_MASK);
 331 }
 332
 333 /**
 334  * zynqmp_qspi_copy_read_data:  Copy data to RX buffer
 335  * @xqspi:      Pointer to the zynqmp_qspi structure
 336  * @data:       The variable where data is stored
 337  * @size:       Number of bytes to be copied from data to RX buffer
 338  */
 339 static void zynqmp_qspi_copy_read_data(struct zynqmp_qspi *xqspi,
 340                                        ulong data, u8 size)
 341 {
 342         memcpy(xqspi->rxbuf, &data, size);
 343         xqspi->rxbuf += size;
 344         xqspi->bytes_to_receive -= size;
 345 }
 346
 347 /**
 348  * zynqmp_prepare_transfer_hardware:    Prepares hardware for transfer.
 349  * @master:     Pointer to the spi_master structure which provides
 350  *              information about the controller.
 351  *
 352  * This function enables SPI master controller.
 353  *
 354  * Return:      0 on success; error value otherwise
 355  */
 356 static int zynqmp_prepare_transfer_hardware(struct spi_master *master)
 357 {
 358         struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);
 359         int ret;
 360
 361         ret = clk_enable(xqspi->refclk);
 362         if (ret)
 363                 return ret;
 364
 365         ret = clk_enable(xqspi->pclk);
 366         if (ret)
 367                 goto clk_err;
 368
 369         zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, GQSPI_EN_MASK);
 370         return 0;
 371 clk_err:
 372         clk_disable(xqspi->refclk);
 373         return ret;
 374 }
 375
 376 /**
 377  * zynqmp_unprepare_transfer_hardware:  Relaxes hardware after transfer
 378  * @master:     Pointer to the spi_master structure which provides
 379  *              information about the controller.
 380  *
 381  * This function disables the SPI master controller.
 382  *
 383  * Return:      Always 0
 384  */
 385 static int zynqmp_unprepare_transfer_hardware(struct spi_master *master)
 386 {
 387         struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);
 388
 389         zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0);
 390         clk_disable(xqspi->refclk);
 391         clk_disable(xqspi->pclk);
 392         return 0;
 393 }
 394
 395 /**
 396  * zynqmp_qspi_chipselect:      Select or deselect the chip select line
 397  * @qspi:       Pointer to the spi_device structure
 398  * @is_high:    Select(0) or deselect (1) the chip select line
 399  */
 400 static void zynqmp_qspi_chipselect(struct spi_device *qspi, bool is_high)
 401 {
 402         struct zynqmp_qspi *xqspi = spi_master_get_devdata(qspi->master);
 403         ulong timeout;
 404         u32 genfifoentry = 0x0, statusreg;
 405
 406         genfifoentry |= GQSPI_GENFIFO_MODE_SPI;
 407         genfifoentry |= xqspi->genfifobus;
 408
 409         if (!is_high) {
 410                 genfifoentry |= xqspi->genfifocs;
 411                 genfifoentry |= GQSPI_GENFIFO_CS_SETUP;
 412         } else {
 413                 genfifoentry |= GQSPI_GENFIFO_CS_HOLD;
 414         }
 415
 416         zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry);
 417
 418         /* Dummy generic FIFO entry */
 419         zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, 0x0);
 420
 421         /* Manually start the generic FIFO command */
 422         zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
 423                         zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) |
 424                         GQSPI_CFG_START_GEN_FIFO_MASK);
 425
 426         timeout = jiffies + msecs_to_jiffies(1000);
 427
 428         /* Wait until the generic FIFO command is empty */
 429         do {
 430                 statusreg = zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST);
 431
 432                 if ((statusreg & GQSPI_ISR_GENFIFOEMPTY_MASK) &&
 433                         (statusreg & GQSPI_ISR_TXEMPTY_MASK))
 434                         break;
 435                 else
 436                         cpu_relax();
 437         } while (!time_after_eq(jiffies, timeout));
 438
 439         if (time_after_eq(jiffies, timeout))
 440                 dev_err(xqspi->dev, "Chip select timed out\n");
 441 }
 442
 443 /**
 444  * zynqmp_qspi_setup_transfer:  Configure QSPI controller for specified
 445  *                              transfer
 446  * @qspi:       Pointer to the spi_device structure
 447  * @transfer:   Pointer to the spi_transfer structure which provides
 448  *              information about next transfer setup parameters
 449  *
 450  * Sets the operational mode of QSPI controller for the next QSPI transfer and
 451  * sets the requested clock frequency.
 452  *
 453  * Return:      Always 0
 454  *
 455  * Note:
 456  *      If the requested frequency is not an exact match with what can be
 457  *      obtained using the pre-scalar value, the driver sets the clock
 458  *      frequency which is lower than the requested frequency (maximum lower)
 459  *      for the transfer.
 460  *
 461  *      If the requested frequency is higher or lower than that is supported
 462  *      by the QSPI controller the driver will set the highest or lowest
 463  *      frequency supported by controller.
 464  */
 465 static int zynqmp_qspi_setup_transfer(struct spi_device *qspi,
 466                                       struct spi_transfer *transfer)
 467 {
 468         struct zynqmp_qspi *xqspi = spi_master_get_devdata(qspi->master);
 469         ulong clk_rate;
 470         u32 config_reg, req_hz, baud_rate_val = 0;
 471
 472         if (transfer)
 473                 req_hz = transfer->speed_hz;
 474         else
 475                 req_hz = qspi->max_speed_hz;
 476
 477         /* Set the clock frequency */
 478         /* If req_hz == 0, default to lowest speed */
 479         clk_rate = clk_get_rate(xqspi->refclk);
 480
 481         while ((baud_rate_val < GQSPI_BAUD_DIV_MAX) &&
 482                (clk_rate /
 483                 (GQSPI_BAUD_DIV_SHIFT << baud_rate_val)) > req_hz)
 484                 baud_rate_val++;
 485
 486         config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
 487
 488         /* Set the QSPI clock phase and clock polarity */
 489         config_reg &= (~GQSPI_CFG_CLK_PHA_MASK) & (~GQSPI_CFG_CLK_POL_MASK);
 490
 491         if (qspi->mode & SPI_CPHA)
 492                 config_reg |= GQSPI_CFG_CLK_PHA_MASK;
 493         if (qspi->mode & SPI_CPOL)
 494                 config_reg |= GQSPI_CFG_CLK_POL_MASK;
 495
 496         config_reg &= ~GQSPI_CFG_BAUD_RATE_DIV_MASK;
 497         config_reg |= (baud_rate_val << GQSPI_CFG_BAUD_RATE_DIV_SHIFT);
 498         zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
 499         return 0;
 500 }
 501
 502 /**
 503  * zynqmp_qspi_setup:   Configure the QSPI controller
 504  * @qspi:       Pointer to the spi_device structure
 505  *
 506  * Sets the operational mode of QSPI controller for the next QSPI transfer,
 507  * baud rate and divisor value to setup the requested qspi clock.
 508  *
 509  * Return:      0 on success; error value otherwise.
 510  */
 511 static int zynqmp_qspi_setup(struct spi_device *qspi)
 512 {
 513         if (qspi->master->busy)
 514                 return -EBUSY;
 515         return 0;
 516 }
 517
 518 /**
 519  * zynqmp_qspi_filltxfifo:      Fills the TX FIFO as long as there is room in
 520  *                              the FIFO or the bytes required to be
 521  *                              transmitted.
 522  * @xqspi:      Pointer to the zynqmp_qspi structure
 523  * @size:       Number of bytes to be copied from TX buffer to TX FIFO
 524  */
 525 static void zynqmp_qspi_filltxfifo(struct zynqmp_qspi *xqspi, int size)
 526 {
 527         u32 count = 0, intermediate;
 528
 529         while ((xqspi->bytes_to_transfer > 0) && (count < size)) {
 530                 memcpy(&intermediate, xqspi->txbuf, 4);
 531                 zynqmp_gqspi_write(xqspi, GQSPI_TXD_OFST, intermediate);
 532
 533                 if (xqspi->bytes_to_transfer >= 4) {
 534                         xqspi->txbuf += 4;
 535                         xqspi->bytes_to_transfer -= 4;
 536                 } else {
 537                         xqspi->txbuf += xqspi->bytes_to_transfer;
 538                         xqspi->bytes_to_transfer = 0;
 539                 }
 540                 count++;
 541         }
 542 }
 543
 544 /**
 545  * zynqmp_qspi_readrxfifo:      Fills the RX FIFO as long as there is room in
 546  *                              the FIFO.
 547  * @xqspi:      Pointer to the zynqmp_qspi structure
 548  * @size:       Number of bytes to be copied from RX buffer to RX FIFO
 549  */
 550 static void zynqmp_qspi_readrxfifo(struct zynqmp_qspi *xqspi, u32 size)
 551 {
 552         ulong data;
 553         int count = 0;
 554
 555         while ((count < size) && (xqspi->bytes_to_receive > 0)) {
 556                 if (xqspi->bytes_to_receive >= 4) {
 557                         (*(u32 *) xqspi->rxbuf) =
 558                         zynqmp_gqspi_read(xqspi, GQSPI_RXD_OFST);
 559                         xqspi->rxbuf += 4;
 560                         xqspi->bytes_to_receive -= 4;
 561                         count += 4;
 562                 } else {
 563                         data = zynqmp_gqspi_read(xqspi, GQSPI_RXD_OFST);
 564                         count += xqspi->bytes_to_receive;
 565                         zynqmp_qspi_copy_read_data(xqspi, data,
 566                                                    xqspi->bytes_to_receive);
 567                         xqspi->bytes_to_receive = 0;
 568                 }
 569         }
 570 }
 571
 572 /**
 573  * zynqmp_process_dma_irq:      Handler for DMA done interrupt of QSPI
 574  *                              controller
 575  * @xqspi:      zynqmp_qspi instance pointer
 576  *
 577  * This function handles DMA interrupt only.
 578  */
 579 static void zynqmp_process_dma_irq(struct zynqmp_qspi *xqspi)
 580 {
 581         u32 config_reg, genfifoentry;
 582
 583         dma_unmap_single(xqspi->dev, xqspi->dma_addr,
 584                                 xqspi->dma_rx_bytes, DMA_FROM_DEVICE);
 585         xqspi->rxbuf += xqspi->dma_rx_bytes;
 586         xqspi->bytes_to_receive -= xqspi->dma_rx_bytes;
 587         xqspi->dma_rx_bytes = 0;
 588
 589         /* Disabling the DMA interrupts */
 590         zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_I_DIS_OFST,
 591                                         GQSPI_QSPIDMA_DST_I_EN_DONE_MASK);
 592
 593         if (xqspi->bytes_to_receive > 0) {
 594                 /* Switch to IO mode,for remaining bytes to receive */
 595                 config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
 596                 config_reg &= ~GQSPI_CFG_MODE_EN_MASK;
 597                 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
 598
 599                 /* Initiate the transfer of remaining bytes */
 600                 genfifoentry = xqspi->genfifoentry;
 601                 genfifoentry |= xqspi->bytes_to_receive;
 602                 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry);
 603
 604                 /* Dummy generic FIFO entry */
 605                 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, 0x0);
 606
 607                 /* Manual start */
 608                 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
 609                         (zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) |
 610                         GQSPI_CFG_START_GEN_FIFO_MASK));
 611
 612                 /* Enable the RX interrupts for IO mode */
 613                 zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
 614                                 GQSPI_IER_GENFIFOEMPTY_MASK |
 615                                 GQSPI_IER_RXNEMPTY_MASK |
 616                                 GQSPI_IER_RXEMPTY_MASK);
 617         }
 618 }
 619
 620 /**
 621  * zynqmp_qspi_irq:     Interrupt service routine of the QSPI controller
 622  * @irq:        IRQ number
 623  * @dev_id:     Pointer to the xqspi structure
 624  *
 625  * This function handles TX empty only.
 626  * On TX empty interrupt this function reads the received data from RX FIFO
 627  * and fills the TX FIFO if there is any data remaining to be transferred.
 628  *
 629  * Return:      IRQ_HANDLED when interrupt is handled
 630  *              IRQ_NONE otherwise.
 631  */
 632 static irqreturn_t zynqmp_qspi_irq(int irq, void *dev_id)
 633 {
 634         struct spi_master *master = dev_id;
 635         struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);
 636         int ret = IRQ_NONE;
 637         u32 status, mask, dma_status = 0;
 638
 639         status = zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST);
 640         zynqmp_gqspi_write(xqspi, GQSPI_ISR_OFST, status);
 641         mask = (status & ~(zynqmp_gqspi_read(xqspi, GQSPI_IMASK_OFST)));
 642
 643         /* Read and clear DMA status */
 644         if (xqspi->mode == GQSPI_MODE_DMA) {
 645                 dma_status =
 646                         zynqmp_gqspi_read(xqspi, GQSPI_QSPIDMA_DST_I_STS_OFST);
 647                 zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_I_STS_OFST,
 648                                                                 dma_status);
 649         }
 650
 651         if (mask & GQSPI_ISR_TXNOT_FULL_MASK) {
 652                 zynqmp_qspi_filltxfifo(xqspi, GQSPI_TX_FIFO_FILL);
 653                 ret = IRQ_HANDLED;
 654         }
 655
 656         if (dma_status & GQSPI_QSPIDMA_DST_I_STS_DONE_MASK) {
 657                 zynqmp_process_dma_irq(xqspi);
 658                 ret = IRQ_HANDLED;
 659         } else if (!(mask & GQSPI_IER_RXEMPTY_MASK) &&
 660                         (mask & GQSPI_IER_GENFIFOEMPTY_MASK)) {
 661                 zynqmp_qspi_readrxfifo(xqspi, GQSPI_RX_FIFO_FILL);
 662                 ret = IRQ_HANDLED;
 663         }
 664
 665         if ((xqspi->bytes_to_receive == 0) && (xqspi->bytes_to_transfer == 0)
 666                         && ((status & GQSPI_IRQ_MASK) == GQSPI_IRQ_MASK)) {
 667                 zynqmp_gqspi_write(xqspi, GQSPI_IDR_OFST, GQSPI_ISR_IDR_MASK);
 668                 spi_finalize_current_transfer(master);
 669                 ret = IRQ_HANDLED;
 670         }
 671         return ret;
 672 }
 673
 674 /**
 675  * zynqmp_qspi_selectspimode:   Selects SPI mode - x1 or x2 or x4.
 676  * @xqspi:      xqspi is a pointer to the GQSPI instance
 677  * @spimode:    spimode - SPI or DUAL or QUAD.
 678  * Return:      Mask to set desired SPI mode in GENFIFO entry.
 679  */
 680 static inline u32 zynqmp_qspi_selectspimode(struct zynqmp_qspi *xqspi,
 681                                                 u8 spimode)
 682 {
 683         u32 mask = 0;
 684
 685         switch (spimode) {
 686         case GQSPI_SELECT_MODE_DUALSPI:
 687                 mask = GQSPI_GENFIFO_MODE_DUALSPI;
 688                 break;
 689         case GQSPI_SELECT_MODE_QUADSPI:
 690                 mask = GQSPI_GENFIFO_MODE_QUADSPI;
 691                 break;
 692         case GQSPI_SELECT_MODE_SPI:
 693                 mask = GQSPI_GENFIFO_MODE_SPI;
 694                 break;
 695         default:
 696                 dev_warn(xqspi->dev, "Invalid SPI mode\n");
 697         }
 698
 699         return mask;
 700 }
 701
 702 /**
 703  * zynq_qspi_setuprxdma:        This function sets up the RX DMA operation
 704  * @xqspi:      xqspi is a pointer to the GQSPI instance.
 705  */
 706 static void zynq_qspi_setuprxdma(struct zynqmp_qspi *xqspi)
 707 {
 708         u32 rx_bytes, rx_rem, config_reg;
 709         dma_addr_t addr;
 710         u64 dma_align =  (u64)(uintptr_t)xqspi->rxbuf;
 711
 712         if ((xqspi->bytes_to_receive < 8) ||
 713                 ((dma_align & GQSPI_DMA_UNALIGN) != 0x0)) {
 714                 /* Setting to IO mode */
 715                 config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
 716                 config_reg &= ~GQSPI_CFG_MODE_EN_MASK;
 717                 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
 718                 xqspi->mode = GQSPI_MODE_IO;
 719                 xqspi->dma_rx_bytes = 0;
 720                 return;
 721         }
 722
 723         rx_rem = xqspi->bytes_to_receive % 4;
 724         rx_bytes = (xqspi->bytes_to_receive - rx_rem);
 725
 726         addr = dma_map_single(xqspi->dev, (void *)xqspi->rxbuf,
 727                                                 rx_bytes, DMA_FROM_DEVICE);
 728         if (dma_mapping_error(xqspi->dev, addr))
 729                 dev_err(xqspi->dev, "ERR:rxdma:memory not mapped\n");
 730
 731         xqspi->dma_rx_bytes = rx_bytes;
 732         xqspi->dma_addr = addr;
 733         zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_ADDR_OFST,
 734                                 (u32)(addr & 0xffffffff));
 735         addr = ((addr >> 16) >> 16);
 736         zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_ADDR_MSB_OFST,
 737                                 ((u32)addr) & 0xfff);
 738
 739         /* Enabling the DMA mode */
 740         config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
 741         config_reg &= ~GQSPI_CFG_MODE_EN_MASK;
 742         config_reg |= GQSPI_CFG_MODE_EN_DMA_MASK;
 743         zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
 744
 745         /* Switch to DMA mode */
 746         xqspi->mode = GQSPI_MODE_DMA;
 747
 748         /* Write the number of bytes to transfer */
 749         zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_SIZE_OFST, rx_bytes);
 750 }
 751
 752 /**
 753  * zynqmp_qspi_txrxsetup:       This function checks the TX/RX buffers in
 754  *                              the transfer and sets up the GENFIFO entries,
 755  *                              TX FIFO as required.
 756  * @xqspi:      xqspi is a pointer to the GQSPI instance.
 757  * @transfer:   It is a pointer to the structure containing transfer data.
 758  * @genfifoentry:       genfifoentry is pointer to the variable in which
 759  *                      GENFIFO mask is returned to calling function
 760  */
 761 static void zynqmp_qspi_txrxsetup(struct zynqmp_qspi *xqspi,
 762                                   struct spi_transfer *transfer,
 763                                   u32 *genfifoentry)
 764 {
 765         u32 config_reg;
 766
 767         /* Transmit */
 768         if ((xqspi->txbuf != NULL) && (xqspi->rxbuf == NULL)) {
 769                 /* Setup data to be TXed */
 770                 *genfifoentry &= ~GQSPI_GENFIFO_RX;
 771                 *genfifoentry |= GQSPI_GENFIFO_DATA_XFER;
 772                 *genfifoentry |= GQSPI_GENFIFO_TX;
 773                 *genfifoentry |=
 774                         zynqmp_qspi_selectspimode(xqspi, transfer->tx_nbits);
 775                 xqspi->bytes_to_transfer = transfer->len;
 776                 if (xqspi->mode == GQSPI_MODE_DMA) {
 777                         config_reg = zynqmp_gqspi_read(xqspi,
 778                                                         GQSPI_CONFIG_OFST);
 779                         config_reg &= ~GQSPI_CFG_MODE_EN_MASK;
 780                         zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
 781                                                                 config_reg);
 782                         xqspi->mode = GQSPI_MODE_IO;
 783                 }
 784                 zynqmp_qspi_filltxfifo(xqspi, GQSPI_TXD_DEPTH);
 785                 /* Discard RX data */
 786                 xqspi->bytes_to_receive = 0;
 787         } else if ((xqspi->txbuf == NULL) && (xqspi->rxbuf != NULL)) {
 788                 /* Receive */
 789
 790                 /* TX auto fill */
 791                 *genfifoentry &= ~GQSPI_GENFIFO_TX;
 792                 /* Setup RX */
 793                 *genfifoentry |= GQSPI_GENFIFO_DATA_XFER;
 794                 *genfifoentry |= GQSPI_GENFIFO_RX;
 795                 *genfifoentry |=
 796                         zynqmp_qspi_selectspimode(xqspi, transfer->rx_nbits);
 797                 xqspi->bytes_to_transfer = 0;
 798                 xqspi->bytes_to_receive = transfer->len;
 799                 zynq_qspi_setuprxdma(xqspi);
 800         }
 801 }
 802
 803 /**
 804  * zynqmp_qspi_start_transfer:  Initiates the QSPI transfer
 805  * @master:     Pointer to the spi_master structure which provides
 806  *              information about the controller.
 807  * @qspi:       Pointer to the spi_device structure
 808  * @transfer:   Pointer to the spi_transfer structure which provide information
 809  *              about next transfer parameters
 810  *
 811  * This function fills the TX FIFO, starts the QSPI transfer, and waits for the
 812  * transfer to be completed.
 813  *
 814  * Return:      Number of bytes transferred in the last transfer
 815  */
 816 static int zynqmp_qspi_start_transfer(struct spi_master *master,
 817                                       struct spi_device *qspi,
 818                                       struct spi_transfer *transfer)
 819 {
 820         struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);
 821         u32 genfifoentry = 0x0, transfer_len;
 822
 823         xqspi->txbuf = transfer->tx_buf;
 824         xqspi->rxbuf = transfer->rx_buf;
 825
 826         zynqmp_qspi_setup_transfer(qspi, transfer);
 827
 828         genfifoentry |= xqspi->genfifocs;
 829         genfifoentry |= xqspi->genfifobus;
 830
 831         zynqmp_qspi_txrxsetup(xqspi, transfer, &genfifoentry);
 832
 833         if (xqspi->mode == GQSPI_MODE_DMA)
 834                 transfer_len = xqspi->dma_rx_bytes;
 835         else
 836                 transfer_len = transfer->len;
 837
 838         xqspi->genfifoentry = genfifoentry;
 839         if ((transfer_len) < GQSPI_GENFIFO_IMM_DATA_MASK) {
 840                 genfifoentry &= ~GQSPI_GENFIFO_IMM_DATA_MASK;
 841                 genfifoentry |= transfer_len;
 842                 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry);
 843         } else {
 844                 int tempcount = transfer_len;
 845                 u32 exponent = 8;       /* 2^8 = 256 */
 846                 u8 imm_data = tempcount & 0xFF;
 847
 848                 tempcount &= ~(tempcount & 0xFF);
 849                 /* Immediate entry */
 850                 if (tempcount != 0) {
 851                         /* Exponent entries */
 852                         genfifoentry |= GQSPI_GENFIFO_EXP;
 853                         while (tempcount != 0) {
 854                                 if (tempcount & GQSPI_GENFIFO_EXP_START) {
 855                                         genfifoentry &=
 856                                             ~GQSPI_GENFIFO_IMM_DATA_MASK;
 857                                         genfifoentry |= exponent;
 858                                         zynqmp_gqspi_write(xqspi,
 859                                                            GQSPI_GEN_FIFO_OFST,
 860                                                            genfifoentry);
 861                                 }
 862                                 tempcount = tempcount >> 1;
 863                                 exponent++;
 864                         }
 865                 }
 866                 if (imm_data != 0) {
 867                         genfifoentry &= ~GQSPI_GENFIFO_EXP;
 868                         genfifoentry &= ~GQSPI_GENFIFO_IMM_DATA_MASK;
 869                         genfifoentry |= (u8) (imm_data & 0xFF);
 870                         zynqmp_gqspi_write(xqspi,
 871                                            GQSPI_GEN_FIFO_OFST, genfifoentry);
 872                 }
 873         }
 874
 875         if ((xqspi->mode == GQSPI_MODE_IO) &&
 876                         (xqspi->rxbuf != NULL)) {
 877                 /* Dummy generic FIFO entry */
 878                 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, 0x0);
 879         }
 880
 881         /* Since we are using manual mode */
 882         zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
 883                            zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) |
 884                            GQSPI_CFG_START_GEN_FIFO_MASK);
 885
 886         if (xqspi->txbuf != NULL)
 887                 /* Enable interrupts for TX */
 888                 zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
 889                                    GQSPI_IER_TXEMPTY_MASK |
 890                                         GQSPI_IER_GENFIFOEMPTY_MASK |
 891                                         GQSPI_IER_TXNOT_FULL_MASK);
 892
 893         if (xqspi->rxbuf != NULL) {
 894                 /* Enable interrupts for RX */
 895                 if (xqspi->mode == GQSPI_MODE_DMA) {
 896                         /* Enable DMA interrupts */
 897                         zynqmp_gqspi_write(xqspi,
 898                                         GQSPI_QSPIDMA_DST_I_EN_OFST,
 899                                         GQSPI_QSPIDMA_DST_I_EN_DONE_MASK);
 900                 } else {
 901                         zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
 902                                         GQSPI_IER_GENFIFOEMPTY_MASK |
 903                                         GQSPI_IER_RXNEMPTY_MASK |
 904                                         GQSPI_IER_RXEMPTY_MASK);
 905                 }
 906         }
 907
 908         return transfer->len;
 909 }
 910
 911 /**
 912  * zynqmp_qspi_suspend: Suspend method for the QSPI driver
 913  * @_dev:       Address of the platform_device structure
 914  *
 915  * This function stops the QSPI driver queue and disables the QSPI controller
 916  *
 917  * Return:      Always 0
 918  */
 919 static int __maybe_unused zynqmp_qspi_suspend(struct device *dev)
 920 {
 921         struct platform_device *pdev = to_platform_device(dev);
 922         struct spi_master *master = platform_get_drvdata(pdev);
 923
 924         spi_master_suspend(master);
 925
 926         zynqmp_unprepare_transfer_hardware(master);
 927
 928         return 0;
 929 }
 930
 931 /**
 932  * zynqmp_qspi_resume:  Resume method for the QSPI driver
 933  * @dev:        Address of the platform_device structure
 934  *
 935  * The function starts the QSPI driver queue and initializes the QSPI
 936  * controller
 937  *
 938  * Return:      0 on success; error value otherwise
 939  */
 940 static int __maybe_unused zynqmp_qspi_resume(struct device *dev)
 941 {
 942         struct platform_device *pdev = to_platform_device(dev);
 943         struct spi_master *master = platform_get_drvdata(pdev);
 944         struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);
 945         int ret = 0;
 946
 947         ret = clk_enable(xqspi->pclk);
 948         if (ret) {
 949                 dev_err(dev, "Cannot enable APB clock.\n");
 950                 return ret;
 951         }
 952
 953         ret = clk_enable(xqspi->refclk);
 954         if (ret) {
 955                 dev_err(dev, "Cannot enable device clock.\n");
 956                 clk_disable(xqspi->pclk);
 957                 return ret;
 958         }
 959
 960         spi_master_resume(master);
 961
 962         return 0;
 963 }
 964
 965 static SIMPLE_DEV_PM_OPS(zynqmp_qspi_dev_pm_ops, zynqmp_qspi_suspend,
 966                          zynqmp_qspi_resume);
 967
 968 /**
 969  * zynqmp_qspi_probe:   Probe method for the QSPI driver
 970  * @pdev:       Pointer to the platform_device structure
 971  *
 972  * This function initializes the driver data structures and the hardware.
 973  *
 974  * Return:      0 on success; error value otherwise
 975  */
 976 static int zynqmp_qspi_probe(struct platform_device *pdev)
 977 {
 978         int ret = 0;
 979         struct spi_master *master;
 980         struct zynqmp_qspi *xqspi;
 981         struct resource *res;
 982         struct device *dev = &pdev->dev;
 983
 984         master = spi_alloc_master(&pdev->dev, sizeof(*xqspi));
 985         if (!master)
 986                 return -ENOMEM;
 987
 988         xqspi = spi_master_get_devdata(master);
 989         master->dev.of_node = pdev->dev.of_node;
 990         platform_set_drvdata(pdev, master);
 991
 992         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 993         xqspi->regs = devm_ioremap_resource(&pdev->dev, res);
 994         if (IS_ERR(xqspi->regs)) {
 995                 ret = PTR_ERR(xqspi->regs);
 996                 goto remove_master;
 997         }
 998
 999         xqspi->dev = dev;
1000         xqspi->pclk = devm_clk_get(&pdev->dev, "pclk");
1001         if (IS_ERR(xqspi->pclk)) {
1002                 dev_err(dev, "pclk clock not found.\n");
1003                 ret = PTR_ERR(xqspi->pclk);
1004                 goto remove_master;
1005         }
1006
1007         ret = clk_prepare_enable(xqspi->pclk);
1008         if (ret) {
1009                 dev_err(dev, "Unable to enable APB clock.\n");
1010                 goto remove_master;
1011         }
1012
1013         xqspi->refclk = devm_clk_get(&pdev->dev, "ref_clk");
1014         if (IS_ERR(xqspi->refclk)) {
1015                 dev_err(dev, "ref_clk clock not found.\n");
1016                 ret = PTR_ERR(xqspi->refclk);
1017                 goto clk_dis_pclk;
1018         }
1019
1020         ret = clk_prepare_enable(xqspi->refclk);
1021         if (ret) {
1022                 dev_err(dev, "Unable to enable device clock.\n");
1023                 goto clk_dis_pclk;
1024         }
1025
1026         /* QSPI controller initializations */
1027         zynqmp_qspi_init_hw(xqspi);
1028
1029         xqspi->irq = platform_get_irq(pdev, 0);
1030         if (xqspi->irq <= 0) {
1031                 ret = -ENXIO;
1032                 dev_err(dev, "irq resource not found\n");
1033                 goto clk_dis_all;
1034         }
1035         ret = devm_request_irq(&pdev->dev, xqspi->irq, zynqmp_qspi_irq,
1036                                0, pdev->name, master);
1037         if (ret != 0) {
1038                 ret = -ENXIO;
1039                 dev_err(dev, "request_irq failed\n");
1040                 goto clk_dis_all;
1041         }
1042
1043         master->num_chipselect = GQSPI_DEFAULT_NUM_CS;
1044
1045         master->setup = zynqmp_qspi_setup;
1046         master->set_cs = zynqmp_qspi_chipselect;
1047         master->transfer_one = zynqmp_qspi_start_transfer;
1048         master->prepare_transfer_hardware = zynqmp_prepare_transfer_hardware;
1049         master->unprepare_transfer_hardware =
1050                                         zynqmp_unprepare_transfer_hardware;
1051         master->max_speed_hz = clk_get_rate(xqspi->refclk) / 2;
1052         master->bits_per_word_mask = SPI_BPW_MASK(8);
1053         master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD |
1054                             SPI_TX_DUAL | SPI_TX_QUAD;
1055
1056         if (master->dev.parent == NULL)
1057                 master->dev.parent = &master->dev;
1058
1059         ret = spi_register_master(master);
1060         if (ret)
1061                 goto clk_dis_all;
1062
1063         return 0;
1064
1065 clk_dis_all:
1066         clk_disable_unprepare(xqspi->refclk);
1067 clk_dis_pclk:
1068         clk_disable_unprepare(xqspi->pclk);
1069 remove_master:
1070         spi_master_put(master);
1071
1072         return ret;
1073 }
1074
1075 /**
1076  * zynqmp_qspi_remove:  Remove method for the QSPI driver
1077  * @pdev:       Pointer to the platform_device structure
1078  *
1079  * This function is called if a device is physically removed from the system or
1080  * if the driver module is being unloaded. It frees all resources allocated to
1081  * the device.
1082  *
1083  * Return:      0 Always
1084  */
1085 static int zynqmp_qspi_remove(struct platform_device *pdev)
1086 {
1087         struct spi_master *master = platform_get_drvdata(pdev);
1088         struct zynqmp_qspi *xqspi = spi_master_get_devdata(master);
1089
1090         zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0);
1091         clk_disable_unprepare(xqspi->refclk);
1092         clk_disable_unprepare(xqspi->pclk);
1093
1094         spi_unregister_master(master);
1095
1096         return 0;
1097 }
1098
1099 static const struct of_device_id zynqmp_qspi_of_match[] = {
1100         { .compatible = "xlnx,zynqmp-qspi-1.0", },
1101         { /* End of table */ }
1102 };
1103
1104 MODULE_DEVICE_TABLE(of, zynqmp_qspi_of_match);
1105
1106 static struct platform_driver zynqmp_qspi_driver = {
1107         .probe = zynqmp_qspi_probe,
1108         .remove = zynqmp_qspi_remove,
1109         .driver = {
1110                 .name = "zynqmp-qspi",
1111                 .of_match_table = zynqmp_qspi_of_match,
1112                 .pm = &zynqmp_qspi_dev_pm_ops,
1113         },
1114 };
1115
1116 module_platform_driver(zynqmp_qspi_driver);
1117
1118 MODULE_AUTHOR("Xilinx, Inc.");
1119 MODULE_DESCRIPTION("Xilinx Zynqmp QSPI driver");
1120 MODULE_LICENSE("GPL");