drivers/spi/spi-tegra210-quad.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 //
   3 // Copyright (C) 2020 NVIDIA CORPORATION.
   4
   5 #include <linux/clk.h>
   6 #include <linux/completion.h>
   7 #include <linux/delay.h>
   8 #include <linux/dmaengine.h>
   9 #include <linux/dma-mapping.h>
  10 #include <linux/dmapool.h>
  11 #include <linux/err.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/io.h>
  14 #include <linux/iopoll.h>
  15 #include <linux/kernel.h>
  16 #include <linux/kthread.h>
  17 #include <linux/module.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/pm_runtime.h>
  20 #include <linux/of.h>
  21 #include <linux/of_device.h>
  22 #include <linux/reset.h>
  23 #include <linux/spi/spi.h>
  24 #include <linux/acpi.h>
  25 #include <linux/property.h>
  26
  27 #define QSPI_COMMAND1                           0x000
  28 #define QSPI_BIT_LENGTH(x)                      (((x) & 0x1f) << 0)
  29 #define QSPI_PACKED                             BIT(5)
  30 #define QSPI_INTERFACE_WIDTH_MASK               (0x03 << 7)
  31 #define QSPI_INTERFACE_WIDTH(x)                 (((x) & 0x03) << 7)
  32 #define QSPI_INTERFACE_WIDTH_SINGLE             QSPI_INTERFACE_WIDTH(0)
  33 #define QSPI_INTERFACE_WIDTH_DUAL               QSPI_INTERFACE_WIDTH(1)
  34 #define QSPI_INTERFACE_WIDTH_QUAD               QSPI_INTERFACE_WIDTH(2)
  35 #define QSPI_SDR_DDR_SEL                        BIT(9)
  36 #define QSPI_TX_EN                              BIT(11)
  37 #define QSPI_RX_EN                              BIT(12)
  38 #define QSPI_CS_SW_VAL                          BIT(20)
  39 #define QSPI_CS_SW_HW                           BIT(21)
  40
  41 #define QSPI_CS_POL_INACTIVE(n)                 (1 << (22 + (n)))
  42 #define QSPI_CS_POL_INACTIVE_MASK               (0xF << 22)
  43 #define QSPI_CS_SEL_0                           (0 << 26)
  44 #define QSPI_CS_SEL_1                           (1 << 26)
  45 #define QSPI_CS_SEL_2                           (2 << 26)
  46 #define QSPI_CS_SEL_3                           (3 << 26)
  47 #define QSPI_CS_SEL_MASK                        (3 << 26)
  48 #define QSPI_CS_SEL(x)                          (((x) & 0x3) << 26)
  49
  50 #define QSPI_CONTROL_MODE_0                     (0 << 28)
  51 #define QSPI_CONTROL_MODE_3                     (3 << 28)
  52 #define QSPI_CONTROL_MODE_MASK                  (3 << 28)
  53 #define QSPI_M_S                                BIT(30)
  54 #define QSPI_PIO                                BIT(31)
  55
  56 #define QSPI_COMMAND2                           0x004
  57 #define QSPI_TX_TAP_DELAY(x)                    (((x) & 0x3f) << 10)
  58 #define QSPI_RX_TAP_DELAY(x)                    (((x) & 0xff) << 0)
  59
  60 #define QSPI_CS_TIMING1                         0x008
  61 #define QSPI_SETUP_HOLD(setup, hold)            (((setup) << 4) | (hold))
  62
  63 #define QSPI_CS_TIMING2                         0x00c
  64 #define CYCLES_BETWEEN_PACKETS_0(x)             (((x) & 0x1f) << 0)
  65 #define CS_ACTIVE_BETWEEN_PACKETS_0             BIT(5)
  66
  67 #define QSPI_TRANS_STATUS                       0x010
  68 #define QSPI_BLK_CNT(val)                       (((val) >> 0) & 0xffff)
  69 #define QSPI_RDY                                BIT(30)
  70
  71 #define QSPI_FIFO_STATUS                        0x014
  72 #define QSPI_RX_FIFO_EMPTY                      BIT(0)
  73 #define QSPI_RX_FIFO_FULL                       BIT(1)
  74 #define QSPI_TX_FIFO_EMPTY                      BIT(2)
  75 #define QSPI_TX_FIFO_FULL                       BIT(3)
  76 #define QSPI_RX_FIFO_UNF                        BIT(4)
  77 #define QSPI_RX_FIFO_OVF                        BIT(5)
  78 #define QSPI_TX_FIFO_UNF                        BIT(6)
  79 #define QSPI_TX_FIFO_OVF                        BIT(7)
  80 #define QSPI_ERR                                BIT(8)
  81 #define QSPI_TX_FIFO_FLUSH                      BIT(14)
  82 #define QSPI_RX_FIFO_FLUSH                      BIT(15)
  83 #define QSPI_TX_FIFO_EMPTY_COUNT(val)           (((val) >> 16) & 0x7f)
  84 #define QSPI_RX_FIFO_FULL_COUNT(val)            (((val) >> 23) & 0x7f)
  85
  86 #define QSPI_FIFO_ERROR                         (QSPI_RX_FIFO_UNF | \
  87                                                  QSPI_RX_FIFO_OVF | \
  88                                                  QSPI_TX_FIFO_UNF | \
  89                                                  QSPI_TX_FIFO_OVF)
  90 #define QSPI_FIFO_EMPTY                         (QSPI_RX_FIFO_EMPTY | \
  91                                                  QSPI_TX_FIFO_EMPTY)
  92
  93 #define QSPI_TX_DATA                            0x018
  94 #define QSPI_RX_DATA                            0x01c
  95
  96 #define QSPI_DMA_CTL                            0x020
  97 #define QSPI_TX_TRIG(n)                         (((n) & 0x3) << 15)
  98 #define QSPI_TX_TRIG_1                          QSPI_TX_TRIG(0)
  99 #define QSPI_TX_TRIG_4                          QSPI_TX_TRIG(1)
 100 #define QSPI_TX_TRIG_8                          QSPI_TX_TRIG(2)
 101 #define QSPI_TX_TRIG_16                         QSPI_TX_TRIG(3)
 102
 103 #define QSPI_RX_TRIG(n)                         (((n) & 0x3) << 19)
 104 #define QSPI_RX_TRIG_1                          QSPI_RX_TRIG(0)
 105 #define QSPI_RX_TRIG_4                          QSPI_RX_TRIG(1)
 106 #define QSPI_RX_TRIG_8                          QSPI_RX_TRIG(2)
 107 #define QSPI_RX_TRIG_16                         QSPI_RX_TRIG(3)
 108
 109 #define QSPI_DMA_EN                             BIT(31)
 110
 111 #define QSPI_DMA_BLK                            0x024
 112 #define QSPI_DMA_BLK_SET(x)                     (((x) & 0xffff) << 0)
 113
 114 #define QSPI_TX_FIFO                            0x108
 115 #define QSPI_RX_FIFO                            0x188
 116
 117 #define QSPI_FIFO_DEPTH                         64
 118
 119 #define QSPI_INTR_MASK                          0x18c
 120 #define QSPI_INTR_RX_FIFO_UNF_MASK              BIT(25)
 121 #define QSPI_INTR_RX_FIFO_OVF_MASK              BIT(26)
 122 #define QSPI_INTR_TX_FIFO_UNF_MASK              BIT(27)
 123 #define QSPI_INTR_TX_FIFO_OVF_MASK              BIT(28)
 124 #define QSPI_INTR_RDY_MASK                      BIT(29)
 125 #define QSPI_INTR_RX_TX_FIFO_ERR                (QSPI_INTR_RX_FIFO_UNF_MASK | \
 126                                                  QSPI_INTR_RX_FIFO_OVF_MASK | \
 127                                                  QSPI_INTR_TX_FIFO_UNF_MASK | \
 128                                                  QSPI_INTR_TX_FIFO_OVF_MASK)
 129
 130 #define QSPI_MISC_REG                           0x194
 131 #define QSPI_NUM_DUMMY_CYCLE(x)                 (((x) & 0xff) << 0)
 132 #define QSPI_DUMMY_CYCLES_MAX                   0xff
 133
 134 #define QSPI_CMB_SEQ_CMD                        0x19c
 135 #define QSPI_COMMAND_VALUE_SET(X)               (((x) & 0xFF) << 0)
 136
 137 #define QSPI_CMB_SEQ_CMD_CFG                    0x1a0
 138 #define QSPI_COMMAND_X1_X2_X4(x)                (((x) & 0x3) << 13)
 139 #define QSPI_COMMAND_X1_X2_X4_MASK              (0x03 << 13)
 140 #define QSPI_COMMAND_SDR_DDR                    BIT(12)
 141 #define QSPI_COMMAND_SIZE_SET(x)                (((x) & 0xFF) << 0)
 142
 143 #define QSPI_GLOBAL_CONFIG                      0X1a4
 144 #define QSPI_CMB_SEQ_EN                         BIT(0)
 145
 146 #define QSPI_CMB_SEQ_ADDR                       0x1a8
 147 #define QSPI_ADDRESS_VALUE_SET(X)               (((x) & 0xFFFF) << 0)
 148
 149 #define QSPI_CMB_SEQ_ADDR_CFG                   0x1ac
 150 #define QSPI_ADDRESS_X1_X2_X4(x)                (((x) & 0x3) << 13)
 151 #define QSPI_ADDRESS_X1_X2_X4_MASK              (0x03 << 13)
 152 #define QSPI_ADDRESS_SDR_DDR                    BIT(12)
 153 #define QSPI_ADDRESS_SIZE_SET(x)                (((x) & 0xFF) << 0)
 154
 155 #define DATA_DIR_TX                             BIT(0)
 156 #define DATA_DIR_RX                             BIT(1)
 157
 158 #define QSPI_DMA_TIMEOUT                        (msecs_to_jiffies(1000))
 159 #define DEFAULT_QSPI_DMA_BUF_LEN                (64 * 1024)
 160 #define CMD_TRANSFER                            0
 161 #define ADDR_TRANSFER                           1
 162 #define DATA_TRANSFER                           2
 163
 164 struct tegra_qspi_soc_data {
 165         bool has_dma;
 166         bool cmb_xfer_capable;
 167         unsigned int cs_count;
 168 };
 169
 170 struct tegra_qspi_client_data {
 171         int tx_clk_tap_delay;
 172         int rx_clk_tap_delay;
 173 };
 174
 175 struct tegra_qspi {
 176         struct device                           *dev;
 177         struct spi_master                       *master;
 178         /* lock to protect data accessed by irq */
 179         spinlock_t                              lock;
 180
 181         struct clk                              *clk;
 182         void __iomem                            *base;
 183         phys_addr_t                             phys;
 184         unsigned int                            irq;
 185
 186         u32                                     cur_speed;
 187         unsigned int                            cur_pos;
 188         unsigned int                            words_per_32bit;
 189         unsigned int                            bytes_per_word;
 190         unsigned int                            curr_dma_words;
 191         unsigned int                            cur_direction;
 192
 193         unsigned int                            cur_rx_pos;
 194         unsigned int                            cur_tx_pos;
 195
 196         unsigned int                            dma_buf_size;
 197         unsigned int                            max_buf_size;
 198         bool                                    is_curr_dma_xfer;
 199
 200         struct completion                       rx_dma_complete;
 201         struct completion                       tx_dma_complete;
 202
 203         u32                                     tx_status;
 204         u32                                     rx_status;
 205         u32                                     status_reg;
 206         bool                                    is_packed;
 207         bool                                    use_dma;
 208
 209         u32                                     command1_reg;
 210         u32                                     dma_control_reg;
 211         u32                                     def_command1_reg;
 212         u32                                     def_command2_reg;
 213         u32                                     spi_cs_timing1;
 214         u32                                     spi_cs_timing2;
 215         u8                                      dummy_cycles;
 216
 217         struct completion                       xfer_completion;
 218         struct spi_transfer                     *curr_xfer;
 219
 220         struct dma_chan                         *rx_dma_chan;
 221         u32                                     *rx_dma_buf;
 222         dma_addr_t                              rx_dma_phys;
 223         struct dma_async_tx_descriptor          *rx_dma_desc;
 224
 225         struct dma_chan                         *tx_dma_chan;
 226         u32                                     *tx_dma_buf;
 227         dma_addr_t                              tx_dma_phys;
 228         struct dma_async_tx_descriptor          *tx_dma_desc;
 229         const struct tegra_qspi_soc_data        *soc_data;
 230 };
 231
 232 static inline u32 tegra_qspi_readl(struct tegra_qspi *tqspi, unsigned long offset)
 233 {
 234         return readl(tqspi->base + offset);
 235 }
 236
 237 static inline void tegra_qspi_writel(struct tegra_qspi *tqspi, u32 value, unsigned long offset)
 238 {
 239         writel(value, tqspi->base + offset);
 240
 241         /* read back register to make sure that register writes completed */
 242         if (offset != QSPI_TX_FIFO)
 243                 readl(tqspi->base + QSPI_COMMAND1);
 244 }
 245
 246 static void tegra_qspi_mask_clear_irq(struct tegra_qspi *tqspi)
 247 {
 248         u32 value;
 249
 250         /* write 1 to clear status register */
 251         value = tegra_qspi_readl(tqspi, QSPI_TRANS_STATUS);
 252         tegra_qspi_writel(tqspi, value, QSPI_TRANS_STATUS);
 253
 254         value = tegra_qspi_readl(tqspi, QSPI_INTR_MASK);
 255         if (!(value & QSPI_INTR_RDY_MASK)) {
 256                 value |= (QSPI_INTR_RDY_MASK | QSPI_INTR_RX_TX_FIFO_ERR);
 257                 tegra_qspi_writel(tqspi, value, QSPI_INTR_MASK);
 258         }
 259
 260         /* clear fifo status error if any */
 261         value = tegra_qspi_readl(tqspi, QSPI_FIFO_STATUS);
 262         if (value & QSPI_ERR)
 263                 tegra_qspi_writel(tqspi, QSPI_ERR | QSPI_FIFO_ERROR, QSPI_FIFO_STATUS);
 264 }
 265
 266 static unsigned int
 267 tegra_qspi_calculate_curr_xfer_param(struct tegra_qspi *tqspi, struct spi_transfer *t)
 268 {
 269         unsigned int max_word, max_len, total_fifo_words;
 270         unsigned int remain_len = t->len - tqspi->cur_pos;
 271         unsigned int bits_per_word = t->bits_per_word;
 272
 273         tqspi->bytes_per_word = DIV_ROUND_UP(bits_per_word, 8);
 274
 275         /*
 276          * Tegra QSPI controller supports packed or unpacked mode transfers.
 277          * Packed mode is used for data transfers using 8, 16, or 32 bits per
 278          * word with a minimum transfer of 1 word and for all other transfers
 279          * unpacked mode will be used.
 280          */
 281
 282         if ((bits_per_word == 8 || bits_per_word == 16 ||
 283              bits_per_word == 32) && t->len > 3) {
 284                 tqspi->is_packed = true;
 285                 tqspi->words_per_32bit = 32 / bits_per_word;
 286         } else {
 287                 tqspi->is_packed = false;
 288                 tqspi->words_per_32bit = 1;
 289         }
 290
 291         if (tqspi->is_packed) {
 292                 max_len = min(remain_len, tqspi->max_buf_size);
 293                 tqspi->curr_dma_words = max_len / tqspi->bytes_per_word;
 294                 total_fifo_words = (max_len + 3) / 4;
 295         } else {
 296                 max_word = (remain_len - 1) / tqspi->bytes_per_word + 1;
 297                 max_word = min(max_word, tqspi->max_buf_size / 4);
 298                 tqspi->curr_dma_words = max_word;
 299                 total_fifo_words = max_word;
 300         }
 301
 302         return total_fifo_words;
 303 }
 304
 305 static unsigned int
 306 tegra_qspi_fill_tx_fifo_from_client_txbuf(struct tegra_qspi *tqspi, struct spi_transfer *t)
 307 {
 308         unsigned int written_words, fifo_words_left, count;
 309         unsigned int len, tx_empty_count, max_n_32bit, i;
 310         u8 *tx_buf = (u8 *)t->tx_buf + tqspi->cur_tx_pos;
 311         u32 fifo_status;
 312
 313         fifo_status = tegra_qspi_readl(tqspi, QSPI_FIFO_STATUS);
 314         tx_empty_count = QSPI_TX_FIFO_EMPTY_COUNT(fifo_status);
 315
 316         if (tqspi->is_packed) {
 317                 fifo_words_left = tx_empty_count * tqspi->words_per_32bit;
 318                 written_words = min(fifo_words_left, tqspi->curr_dma_words);
 319                 len = written_words * tqspi->bytes_per_word;
 320                 max_n_32bit = DIV_ROUND_UP(len, 4);
 321                 for (count = 0; count < max_n_32bit; count++) {
 322                         u32 x = 0;
 323
 324                         for (i = 0; (i < 4) && len; i++, len--)
 325                                 x |= (u32)(*tx_buf++) << (i * 8);
 326                         tegra_qspi_writel(tqspi, x, QSPI_TX_FIFO);
 327                 }
 328
 329                 tqspi->cur_tx_pos += written_words * tqspi->bytes_per_word;
 330         } else {
 331                 unsigned int write_bytes;
 332                 u8 bytes_per_word = tqspi->bytes_per_word;
 333
 334                 max_n_32bit = min(tqspi->curr_dma_words, tx_empty_count);
 335                 written_words = max_n_32bit;
 336                 len = written_words * tqspi->bytes_per_word;
 337                 if (len > t->len - tqspi->cur_pos)
 338                         len = t->len - tqspi->cur_pos;
 339                 write_bytes = len;
 340                 for (count = 0; count < max_n_32bit; count++) {
 341                         u32 x = 0;
 342
 343                         for (i = 0; len && (i < bytes_per_word); i++, len--)
 344                                 x |= (u32)(*tx_buf++) << (i * 8);
 345                         tegra_qspi_writel(tqspi, x, QSPI_TX_FIFO);
 346                 }
 347
 348                 tqspi->cur_tx_pos += write_bytes;
 349         }
 350
 351         return written_words;
 352 }
 353
 354 static unsigned int
 355 tegra_qspi_read_rx_fifo_to_client_rxbuf(struct tegra_qspi *tqspi, struct spi_transfer *t)
 356 {
 357         u8 *rx_buf = (u8 *)t->rx_buf + tqspi->cur_rx_pos;
 358         unsigned int len, rx_full_count, count, i;
 359         unsigned int read_words = 0;
 360         u32 fifo_status, x;
 361
 362         fifo_status = tegra_qspi_readl(tqspi, QSPI_FIFO_STATUS);
 363         rx_full_count = QSPI_RX_FIFO_FULL_COUNT(fifo_status);
 364         if (tqspi->is_packed) {
 365                 len = tqspi->curr_dma_words * tqspi->bytes_per_word;
 366                 for (count = 0; count < rx_full_count; count++) {
 367                         x = tegra_qspi_readl(tqspi, QSPI_RX_FIFO);
 368
 369                         for (i = 0; len && (i < 4); i++, len--)
 370                                 *rx_buf++ = (x >> i * 8) & 0xff;
 371                 }
 372
 373                 read_words += tqspi->curr_dma_words;
 374                 tqspi->cur_rx_pos += tqspi->curr_dma_words * tqspi->bytes_per_word;
 375         } else {
 376                 u32 rx_mask = ((u32)1 << t->bits_per_word) - 1;
 377                 u8 bytes_per_word = tqspi->bytes_per_word;
 378                 unsigned int read_bytes;
 379
 380                 len = rx_full_count * bytes_per_word;
 381                 if (len > t->len - tqspi->cur_pos)
 382                         len = t->len - tqspi->cur_pos;
 383                 read_bytes = len;
 384                 for (count = 0; count < rx_full_count; count++) {
 385                         x = tegra_qspi_readl(tqspi, QSPI_RX_FIFO) & rx_mask;
 386
 387                         for (i = 0; len && (i < bytes_per_word); i++, len--)
 388                                 *rx_buf++ = (x >> (i * 8)) & 0xff;
 389                 }
 390
 391                 read_words += rx_full_count;
 392                 tqspi->cur_rx_pos += read_bytes;
 393         }
 394
 395         return read_words;
 396 }
 397
 398 static void
 399 tegra_qspi_copy_client_txbuf_to_qspi_txbuf(struct tegra_qspi *tqspi, struct spi_transfer *t)
 400 {
 401         dma_sync_single_for_cpu(tqspi->dev, tqspi->tx_dma_phys,
 402                                 tqspi->dma_buf_size, DMA_TO_DEVICE);
 403
 404         /*
 405          * In packed mode, each word in FIFO may contain multiple packets
 406          * based on bits per word. So all bytes in each FIFO word are valid.
 407          *
 408          * In unpacked mode, each word in FIFO contains single packet and
 409          * based on bits per word any remaining bits in FIFO word will be
 410          * ignored by the hardware and are invalid bits.
 411          */
 412         if (tqspi->is_packed) {
 413                 tqspi->cur_tx_pos += tqspi->curr_dma_words * tqspi->bytes_per_word;
 414         } else {
 415                 u8 *tx_buf = (u8 *)t->tx_buf + tqspi->cur_tx_pos;
 416                 unsigned int i, count, consume, write_bytes;
 417
 418                 /*
 419                  * Fill tx_dma_buf to contain single packet in each word based
 420                  * on bits per word from SPI core tx_buf.
 421                  */
 422                 consume = tqspi->curr_dma_words * tqspi->bytes_per_word;
 423                 if (consume > t->len - tqspi->cur_pos)
 424                         consume = t->len - tqspi->cur_pos;
 425                 write_bytes = consume;
 426                 for (count = 0; count < tqspi->curr_dma_words; count++) {
 427                         u32 x = 0;
 428
 429                         for (i = 0; consume && (i < tqspi->bytes_per_word); i++, consume--)
 430                                 x |= (u32)(*tx_buf++) << (i * 8);
 431                         tqspi->tx_dma_buf[count] = x;
 432                 }
 433
 434                 tqspi->cur_tx_pos += write_bytes;
 435         }
 436
 437         dma_sync_single_for_device(tqspi->dev, tqspi->tx_dma_phys,
 438                                    tqspi->dma_buf_size, DMA_TO_DEVICE);
 439 }
 440
 441 static void
 442 tegra_qspi_copy_qspi_rxbuf_to_client_rxbuf(struct tegra_qspi *tqspi, struct spi_transfer *t)
 443 {
 444         dma_sync_single_for_cpu(tqspi->dev, tqspi->rx_dma_phys,
 445                                 tqspi->dma_buf_size, DMA_FROM_DEVICE);
 446
 447         if (tqspi->is_packed) {
 448                 tqspi->cur_rx_pos += tqspi->curr_dma_words * tqspi->bytes_per_word;
 449         } else {
 450                 unsigned char *rx_buf = t->rx_buf + tqspi->cur_rx_pos;
 451                 u32 rx_mask = ((u32)1 << t->bits_per_word) - 1;
 452                 unsigned int i, count, consume, read_bytes;
 453
 454                 /*
 455                  * Each FIFO word contains single data packet.
 456                  * Skip invalid bits in each FIFO word based on bits per word
 457                  * and align bytes while filling in SPI core rx_buf.
 458                  */
 459                 consume = tqspi->curr_dma_words * tqspi->bytes_per_word;
 460                 if (consume > t->len - tqspi->cur_pos)
 461                         consume = t->len - tqspi->cur_pos;
 462                 read_bytes = consume;
 463                 for (count = 0; count < tqspi->curr_dma_words; count++) {
 464                         u32 x = tqspi->rx_dma_buf[count] & rx_mask;
 465
 466                         for (i = 0; consume && (i < tqspi->bytes_per_word); i++, consume--)
 467                                 *rx_buf++ = (x >> (i * 8)) & 0xff;
 468                 }
 469
 470                 tqspi->cur_rx_pos += read_bytes;
 471         }
 472
 473         dma_sync_single_for_device(tqspi->dev, tqspi->rx_dma_phys,
 474                                    tqspi->dma_buf_size, DMA_FROM_DEVICE);
 475 }
 476
 477 static void tegra_qspi_dma_complete(void *args)
 478 {
 479         struct completion *dma_complete = args;
 480
 481         complete(dma_complete);
 482 }
 483
 484 static int tegra_qspi_start_tx_dma(struct tegra_qspi *tqspi, struct spi_transfer *t, int len)
 485 {
 486         dma_addr_t tx_dma_phys;
 487
 488         reinit_completion(&tqspi->tx_dma_complete);
 489
 490         if (tqspi->is_packed)
 491                 tx_dma_phys = t->tx_dma;
 492         else
 493                 tx_dma_phys = tqspi->tx_dma_phys;
 494
 495         tqspi->tx_dma_desc = dmaengine_prep_slave_single(tqspi->tx_dma_chan, tx_dma_phys,
 496                                                          len, DMA_MEM_TO_DEV,
 497                                                          DMA_PREP_INTERRUPT |  DMA_CTRL_ACK);
 498
 499         if (!tqspi->tx_dma_desc) {
 500                 dev_err(tqspi->dev, "Unable to get TX descriptor\n");
 501                 return -EIO;
 502         }
 503
 504         tqspi->tx_dma_desc->callback = tegra_qspi_dma_complete;
 505         tqspi->tx_dma_desc->callback_param = &tqspi->tx_dma_complete;
 506         dmaengine_submit(tqspi->tx_dma_desc);
 507         dma_async_issue_pending(tqspi->tx_dma_chan);
 508
 509         return 0;
 510 }
 511
 512 static int tegra_qspi_start_rx_dma(struct tegra_qspi *tqspi, struct spi_transfer *t, int len)
 513 {
 514         dma_addr_t rx_dma_phys;
 515
 516         reinit_completion(&tqspi->rx_dma_complete);
 517
 518         if (tqspi->is_packed)
 519                 rx_dma_phys = t->rx_dma;
 520         else
 521                 rx_dma_phys = tqspi->rx_dma_phys;
 522
 523         tqspi->rx_dma_desc = dmaengine_prep_slave_single(tqspi->rx_dma_chan, rx_dma_phys,
 524                                                          len, DMA_DEV_TO_MEM,
 525                                                          DMA_PREP_INTERRUPT |  DMA_CTRL_ACK);
 526
 527         if (!tqspi->rx_dma_desc) {
 528                 dev_err(tqspi->dev, "Unable to get RX descriptor\n");
 529                 return -EIO;
 530         }
 531
 532         tqspi->rx_dma_desc->callback = tegra_qspi_dma_complete;
 533         tqspi->rx_dma_desc->callback_param = &tqspi->rx_dma_complete;
 534         dmaengine_submit(tqspi->rx_dma_desc);
 535         dma_async_issue_pending(tqspi->rx_dma_chan);
 536
 537         return 0;
 538 }
 539
 540 static int tegra_qspi_flush_fifos(struct tegra_qspi *tqspi, bool atomic)
 541 {
 542         void __iomem *addr = tqspi->base + QSPI_FIFO_STATUS;
 543         u32 val;
 544
 545         val = tegra_qspi_readl(tqspi, QSPI_FIFO_STATUS);
 546         if ((val & QSPI_FIFO_EMPTY) == QSPI_FIFO_EMPTY)
 547                 return 0;
 548
 549         val |= QSPI_RX_FIFO_FLUSH | QSPI_TX_FIFO_FLUSH;
 550         tegra_qspi_writel(tqspi, val, QSPI_FIFO_STATUS);
 551
 552         if (!atomic)
 553                 return readl_relaxed_poll_timeout(addr, val,
 554                                                   (val & QSPI_FIFO_EMPTY) == QSPI_FIFO_EMPTY,
 555                                                   1000, 1000000);
 556
 557         return readl_relaxed_poll_timeout_atomic(addr, val,
 558                                                  (val & QSPI_FIFO_EMPTY) == QSPI_FIFO_EMPTY,
 559                                                  1000, 1000000);
 560 }
 561
 562 static void tegra_qspi_unmask_irq(struct tegra_qspi *tqspi)
 563 {
 564         u32 intr_mask;
 565
 566         intr_mask = tegra_qspi_readl(tqspi, QSPI_INTR_MASK);
 567         intr_mask &= ~(QSPI_INTR_RDY_MASK | QSPI_INTR_RX_TX_FIFO_ERR);
 568         tegra_qspi_writel(tqspi, intr_mask, QSPI_INTR_MASK);
 569 }
 570
 571 static int tegra_qspi_dma_map_xfer(struct tegra_qspi *tqspi, struct spi_transfer *t)
 572 {
 573         u8 *tx_buf = (u8 *)t->tx_buf + tqspi->cur_tx_pos;
 574         u8 *rx_buf = (u8 *)t->rx_buf + tqspi->cur_rx_pos;
 575         unsigned int len;
 576
 577         len = DIV_ROUND_UP(tqspi->curr_dma_words * tqspi->bytes_per_word, 4) * 4;
 578
 579         if (t->tx_buf) {
 580                 t->tx_dma = dma_map_single(tqspi->dev, (void *)tx_buf, len, DMA_TO_DEVICE);
 581                 if (dma_mapping_error(tqspi->dev, t->tx_dma))
 582                         return -ENOMEM;
 583         }
 584
 585         if (t->rx_buf) {
 586                 t->rx_dma = dma_map_single(tqspi->dev, (void *)rx_buf, len, DMA_FROM_DEVICE);
 587                 if (dma_mapping_error(tqspi->dev, t->rx_dma)) {
 588                         dma_unmap_single(tqspi->dev, t->tx_dma, len, DMA_TO_DEVICE);
 589                         return -ENOMEM;
 590                 }
 591         }
 592
 593         return 0;
 594 }
 595
 596 static void tegra_qspi_dma_unmap_xfer(struct tegra_qspi *tqspi, struct spi_transfer *t)
 597 {
 598         unsigned int len;
 599
 600         len = DIV_ROUND_UP(tqspi->curr_dma_words * tqspi->bytes_per_word, 4) * 4;
 601
 602         dma_unmap_single(tqspi->dev, t->tx_dma, len, DMA_TO_DEVICE);
 603         dma_unmap_single(tqspi->dev, t->rx_dma, len, DMA_FROM_DEVICE);
 604 }
 605
 606 static int tegra_qspi_start_dma_based_transfer(struct tegra_qspi *tqspi, struct spi_transfer *t)
 607 {
 608         struct dma_slave_config dma_sconfig = { 0 };
 609         unsigned int len;
 610         u8 dma_burst;
 611         int ret = 0;
 612         u32 val;
 613
 614         if (tqspi->is_packed) {
 615                 ret = tegra_qspi_dma_map_xfer(tqspi, t);
 616                 if (ret < 0)
 617                         return ret;
 618         }
 619
 620         val = QSPI_DMA_BLK_SET(tqspi->curr_dma_words - 1);
 621         tegra_qspi_writel(tqspi, val, QSPI_DMA_BLK);
 622
 623         tegra_qspi_unmask_irq(tqspi);
 624
 625         if (tqspi->is_packed)
 626                 len = DIV_ROUND_UP(tqspi->curr_dma_words * tqspi->bytes_per_word, 4) * 4;
 627         else
 628                 len = tqspi->curr_dma_words * 4;
 629
 630         /* set attention level based on length of transfer */
 631         val = 0;
 632         if (len & 0xf) {
 633                 val |= QSPI_TX_TRIG_1 | QSPI_RX_TRIG_1;
 634                 dma_burst = 1;
 635         } else if (((len) >> 4) & 0x1) {
 636                 val |= QSPI_TX_TRIG_4 | QSPI_RX_TRIG_4;
 637                 dma_burst = 4;
 638         } else {
 639                 val |= QSPI_TX_TRIG_8 | QSPI_RX_TRIG_8;
 640                 dma_burst = 8;
 641         }
 642
 643         tegra_qspi_writel(tqspi, val, QSPI_DMA_CTL);
 644         tqspi->dma_control_reg = val;
 645
 646         dma_sconfig.device_fc = true;
 647         if (tqspi->cur_direction & DATA_DIR_TX) {
 648                 dma_sconfig.dst_addr = tqspi->phys + QSPI_TX_FIFO;
 649                 dma_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 650                 dma_sconfig.dst_maxburst = dma_burst;
 651                 ret = dmaengine_slave_config(tqspi->tx_dma_chan, &dma_sconfig);
 652                 if (ret < 0) {
 653                         dev_err(tqspi->dev, "failed DMA slave config: %d\n", ret);
 654                         return ret;
 655                 }
 656
 657                 tegra_qspi_copy_client_txbuf_to_qspi_txbuf(tqspi, t);
 658                 ret = tegra_qspi_start_tx_dma(tqspi, t, len);
 659                 if (ret < 0) {
 660                         dev_err(tqspi->dev, "failed to starting TX DMA: %d\n", ret);
 661                         return ret;
 662                 }
 663         }
 664
 665         if (tqspi->cur_direction & DATA_DIR_RX) {
 666                 dma_sconfig.src_addr = tqspi->phys + QSPI_RX_FIFO;
 667                 dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 668                 dma_sconfig.src_maxburst = dma_burst;
 669                 ret = dmaengine_slave_config(tqspi->rx_dma_chan, &dma_sconfig);
 670                 if (ret < 0) {
 671                         dev_err(tqspi->dev, "failed DMA slave config: %d\n", ret);
 672                         return ret;
 673                 }
 674
 675                 dma_sync_single_for_device(tqspi->dev, tqspi->rx_dma_phys,
 676                                            tqspi->dma_buf_size,
 677                                            DMA_FROM_DEVICE);
 678
 679                 ret = tegra_qspi_start_rx_dma(tqspi, t, len);
 680                 if (ret < 0) {
 681                         dev_err(tqspi->dev, "failed to start RX DMA: %d\n", ret);
 682                         if (tqspi->cur_direction & DATA_DIR_TX)
 683                                 dmaengine_terminate_all(tqspi->tx_dma_chan);
 684                         return ret;
 685                 }
 686         }
 687
 688         tegra_qspi_writel(tqspi, tqspi->command1_reg, QSPI_COMMAND1);
 689
 690         tqspi->is_curr_dma_xfer = true;
 691         tqspi->dma_control_reg = val;
 692         val |= QSPI_DMA_EN;
 693         tegra_qspi_writel(tqspi, val, QSPI_DMA_CTL);
 694
 695         return ret;
 696 }
 697
 698 static int tegra_qspi_start_cpu_based_transfer(struct tegra_qspi *qspi, struct spi_transfer *t)
 699 {
 700         u32 val;
 701         unsigned int cur_words;
 702
 703         if (qspi->cur_direction & DATA_DIR_TX)
 704                 cur_words = tegra_qspi_fill_tx_fifo_from_client_txbuf(qspi, t);
 705         else
 706                 cur_words = qspi->curr_dma_words;
 707
 708         val = QSPI_DMA_BLK_SET(cur_words - 1);
 709         tegra_qspi_writel(qspi, val, QSPI_DMA_BLK);
 710
 711         tegra_qspi_unmask_irq(qspi);
 712
 713         qspi->is_curr_dma_xfer = false;
 714         val = qspi->command1_reg;
 715         val |= QSPI_PIO;
 716         tegra_qspi_writel(qspi, val, QSPI_COMMAND1);
 717
 718         return 0;
 719 }
 720
 721 static void tegra_qspi_deinit_dma(struct tegra_qspi *tqspi)
 722 {
 723         if (!tqspi->soc_data->has_dma)
 724                 return;
 725
 726         if (tqspi->tx_dma_buf) {
 727                 dma_free_coherent(tqspi->dev, tqspi->dma_buf_size,
 728                                   tqspi->tx_dma_buf, tqspi->tx_dma_phys);
 729                 tqspi->tx_dma_buf = NULL;
 730         }
 731
 732         if (tqspi->tx_dma_chan) {
 733                 dma_release_channel(tqspi->tx_dma_chan);
 734                 tqspi->tx_dma_chan = NULL;
 735         }
 736
 737         if (tqspi->rx_dma_buf) {
 738                 dma_free_coherent(tqspi->dev, tqspi->dma_buf_size,
 739                                   tqspi->rx_dma_buf, tqspi->rx_dma_phys);
 740                 tqspi->rx_dma_buf = NULL;
 741         }
 742
 743         if (tqspi->rx_dma_chan) {
 744                 dma_release_channel(tqspi->rx_dma_chan);
 745                 tqspi->rx_dma_chan = NULL;
 746         }
 747 }
 748
 749 static int tegra_qspi_init_dma(struct tegra_qspi *tqspi)
 750 {
 751         struct dma_chan *dma_chan;
 752         dma_addr_t dma_phys;
 753         u32 *dma_buf;
 754         int err;
 755
 756         if (!tqspi->soc_data->has_dma)
 757                 return 0;
 758
 759         dma_chan = dma_request_chan(tqspi->dev, "rx");
 760         if (IS_ERR(dma_chan)) {
 761                 err = PTR_ERR(dma_chan);
 762                 goto err_out;
 763         }
 764
 765         tqspi->rx_dma_chan = dma_chan;
 766
 767         dma_buf = dma_alloc_coherent(tqspi->dev, tqspi->dma_buf_size, &dma_phys, GFP_KERNEL);
 768         if (!dma_buf) {
 769                 err = -ENOMEM;
 770                 goto err_out;
 771         }
 772
 773         tqspi->rx_dma_buf = dma_buf;
 774         tqspi->rx_dma_phys = dma_phys;
 775
 776         dma_chan = dma_request_chan(tqspi->dev, "tx");
 777         if (IS_ERR(dma_chan)) {
 778                 err = PTR_ERR(dma_chan);
 779                 goto err_out;
 780         }
 781
 782         tqspi->tx_dma_chan = dma_chan;
 783
 784         dma_buf = dma_alloc_coherent(tqspi->dev, tqspi->dma_buf_size, &dma_phys, GFP_KERNEL);
 785         if (!dma_buf) {
 786                 err = -ENOMEM;
 787                 goto err_out;
 788         }
 789
 790         tqspi->tx_dma_buf = dma_buf;
 791         tqspi->tx_dma_phys = dma_phys;
 792         tqspi->use_dma = true;
 793
 794         return 0;
 795
 796 err_out:
 797         tegra_qspi_deinit_dma(tqspi);
 798
 799         if (err != -EPROBE_DEFER) {
 800                 dev_err(tqspi->dev, "cannot use DMA: %d\n", err);
 801                 dev_err(tqspi->dev, "falling back to PIO\n");
 802                 return 0;
 803         }
 804
 805         return err;
 806 }
 807
 808 static u32 tegra_qspi_setup_transfer_one(struct spi_device *spi, struct spi_transfer *t,
 809                                          bool is_first_of_msg)
 810 {
 811         struct tegra_qspi *tqspi = spi_master_get_devdata(spi->master);
 812         struct tegra_qspi_client_data *cdata = spi->controller_data;
 813         u32 command1, command2, speed = t->speed_hz;
 814         u8 bits_per_word = t->bits_per_word;
 815         u32 tx_tap = 0, rx_tap = 0;
 816         int req_mode;
 817
 818         if (!has_acpi_companion(tqspi->dev) && speed != tqspi->cur_speed) {
 819                 clk_set_rate(tqspi->clk, speed);
 820                 tqspi->cur_speed = speed;
 821         }
 822
 823         tqspi->cur_pos = 0;
 824         tqspi->cur_rx_pos = 0;
 825         tqspi->cur_tx_pos = 0;
 826         tqspi->curr_xfer = t;
 827
 828         if (is_first_of_msg) {
 829                 tegra_qspi_mask_clear_irq(tqspi);
 830
 831                 command1 = tqspi->def_command1_reg;
 832                 command1 |= QSPI_CS_SEL(spi->chip_select);
 833                 command1 |= QSPI_BIT_LENGTH(bits_per_word - 1);
 834
 835                 command1 &= ~QSPI_CONTROL_MODE_MASK;
 836                 req_mode = spi->mode & 0x3;
 837                 if (req_mode == SPI_MODE_3)
 838                         command1 |= QSPI_CONTROL_MODE_3;
 839                 else
 840                         command1 |= QSPI_CONTROL_MODE_0;
 841
 842                 if (spi->mode & SPI_CS_HIGH)
 843                         command1 |= QSPI_CS_SW_VAL;
 844                 else
 845                         command1 &= ~QSPI_CS_SW_VAL;
 846                 tegra_qspi_writel(tqspi, command1, QSPI_COMMAND1);
 847
 848                 if (cdata && cdata->tx_clk_tap_delay)
 849                         tx_tap = cdata->tx_clk_tap_delay;
 850
 851                 if (cdata && cdata->rx_clk_tap_delay)
 852                         rx_tap = cdata->rx_clk_tap_delay;
 853
 854                 command2 = QSPI_TX_TAP_DELAY(tx_tap) | QSPI_RX_TAP_DELAY(rx_tap);
 855                 if (command2 != tqspi->def_command2_reg)
 856                         tegra_qspi_writel(tqspi, command2, QSPI_COMMAND2);
 857
 858         } else {
 859                 command1 = tqspi->command1_reg;
 860                 command1 &= ~QSPI_BIT_LENGTH(~0);
 861                 command1 |= QSPI_BIT_LENGTH(bits_per_word - 1);
 862         }
 863
 864         command1 &= ~QSPI_SDR_DDR_SEL;
 865
 866         return command1;
 867 }
 868
 869 static int tegra_qspi_start_transfer_one(struct spi_device *spi,
 870                                          struct spi_transfer *t, u32 command1)
 871 {
 872         struct tegra_qspi *tqspi = spi_master_get_devdata(spi->master);
 873         unsigned int total_fifo_words;
 874         u8 bus_width = 0;
 875         int ret;
 876
 877         total_fifo_words = tegra_qspi_calculate_curr_xfer_param(tqspi, t);
 878
 879         command1 &= ~QSPI_PACKED;
 880         if (tqspi->is_packed)
 881                 command1 |= QSPI_PACKED;
 882         tegra_qspi_writel(tqspi, command1, QSPI_COMMAND1);
 883
 884         tqspi->cur_direction = 0;
 885
 886         command1 &= ~(QSPI_TX_EN | QSPI_RX_EN);
 887         if (t->rx_buf) {
 888                 command1 |= QSPI_RX_EN;
 889                 tqspi->cur_direction |= DATA_DIR_RX;
 890                 bus_width = t->rx_nbits;
 891         }
 892
 893         if (t->tx_buf) {
 894                 command1 |= QSPI_TX_EN;
 895                 tqspi->cur_direction |= DATA_DIR_TX;
 896                 bus_width = t->tx_nbits;
 897         }
 898
 899         command1 &= ~QSPI_INTERFACE_WIDTH_MASK;
 900
 901         if (bus_width == SPI_NBITS_QUAD)
 902                 command1 |= QSPI_INTERFACE_WIDTH_QUAD;
 903         else if (bus_width == SPI_NBITS_DUAL)
 904                 command1 |= QSPI_INTERFACE_WIDTH_DUAL;
 905         else
 906                 command1 |= QSPI_INTERFACE_WIDTH_SINGLE;
 907
 908         tqspi->command1_reg = command1;
 909
 910         tegra_qspi_writel(tqspi, QSPI_NUM_DUMMY_CYCLE(tqspi->dummy_cycles), QSPI_MISC_REG);
 911
 912         ret = tegra_qspi_flush_fifos(tqspi, false);
 913         if (ret < 0)
 914                 return ret;
 915
 916         if (tqspi->use_dma && total_fifo_words > QSPI_FIFO_DEPTH)
 917                 ret = tegra_qspi_start_dma_based_transfer(tqspi, t);
 918         else
 919                 ret = tegra_qspi_start_cpu_based_transfer(tqspi, t);
 920
 921         return ret;
 922 }
 923
 924 static struct tegra_qspi_client_data *tegra_qspi_parse_cdata_dt(struct spi_device *spi)
 925 {
 926         struct tegra_qspi_client_data *cdata;
 927         struct tegra_qspi *tqspi = spi_master_get_devdata(spi->master);
 928
 929         cdata = devm_kzalloc(tqspi->dev, sizeof(*cdata), GFP_KERNEL);
 930         if (!cdata)
 931                 return NULL;
 932
 933         device_property_read_u32(&spi->dev, "nvidia,tx-clk-tap-delay",
 934                                  &cdata->tx_clk_tap_delay);
 935         device_property_read_u32(&spi->dev, "nvidia,rx-clk-tap-delay",
 936                                  &cdata->rx_clk_tap_delay);
 937
 938         return cdata;
 939 }
 940
 941 static int tegra_qspi_setup(struct spi_device *spi)
 942 {
 943         struct tegra_qspi *tqspi = spi_master_get_devdata(spi->master);
 944         struct tegra_qspi_client_data *cdata = spi->controller_data;
 945         unsigned long flags;
 946         u32 val;
 947         int ret;
 948
 949         ret = pm_runtime_resume_and_get(tqspi->dev);
 950         if (ret < 0) {
 951                 dev_err(tqspi->dev, "failed to get runtime PM: %d\n", ret);
 952                 return ret;
 953         }
 954
 955         if (!cdata) {
 956                 cdata = tegra_qspi_parse_cdata_dt(spi);
 957                 spi->controller_data = cdata;
 958         }
 959         spin_lock_irqsave(&tqspi->lock, flags);
 960
 961         /* keep default cs state to inactive */
 962         val = tqspi->def_command1_reg;
 963         val |= QSPI_CS_SEL(spi->chip_select);
 964         if (spi->mode & SPI_CS_HIGH)
 965                 val &= ~QSPI_CS_POL_INACTIVE(spi->chip_select);
 966         else
 967                 val |= QSPI_CS_POL_INACTIVE(spi->chip_select);
 968
 969         tqspi->def_command1_reg = val;
 970         tegra_qspi_writel(tqspi, tqspi->def_command1_reg, QSPI_COMMAND1);
 971
 972         spin_unlock_irqrestore(&tqspi->lock, flags);
 973
 974         pm_runtime_put(tqspi->dev);
 975
 976         return 0;
 977 }
 978
 979 static void tegra_qspi_dump_regs(struct tegra_qspi *tqspi)
 980 {
 981         dev_dbg(tqspi->dev, "============ QSPI REGISTER DUMP ============\n");
 982         dev_dbg(tqspi->dev, "Command1:    0x%08x | Command2:    0x%08x\n",
 983                 tegra_qspi_readl(tqspi, QSPI_COMMAND1),
 984                 tegra_qspi_readl(tqspi, QSPI_COMMAND2));
 985         dev_dbg(tqspi->dev, "DMA_CTL:     0x%08x | DMA_BLK:     0x%08x\n",
 986                 tegra_qspi_readl(tqspi, QSPI_DMA_CTL),
 987                 tegra_qspi_readl(tqspi, QSPI_DMA_BLK));
 988         dev_dbg(tqspi->dev, "INTR_MASK:  0x%08x | MISC: 0x%08x\n",
 989                 tegra_qspi_readl(tqspi, QSPI_INTR_MASK),
 990                 tegra_qspi_readl(tqspi, QSPI_MISC_REG));
 991         dev_dbg(tqspi->dev, "TRANS_STAT:  0x%08x | FIFO_STATUS: 0x%08x\n",
 992                 tegra_qspi_readl(tqspi, QSPI_TRANS_STATUS),
 993                 tegra_qspi_readl(tqspi, QSPI_FIFO_STATUS));
 994 }
 995
 996 static void tegra_qspi_handle_error(struct tegra_qspi *tqspi)
 997 {
 998         dev_err(tqspi->dev, "error in transfer, fifo status 0x%08x\n", tqspi->status_reg);
 999         tegra_qspi_dump_regs(tqspi);
1000         tegra_qspi_flush_fifos(tqspi, true);
1001         if (device_reset(tqspi->dev) < 0)
1002                 dev_warn_once(tqspi->dev, "device reset failed\n");
1003 }
1004
1005 static void tegra_qspi_transfer_end(struct spi_device *spi)
1006 {
1007         struct tegra_qspi *tqspi = spi_master_get_devdata(spi->master);
1008         int cs_val = (spi->mode & SPI_CS_HIGH) ? 0 : 1;
1009
1010         if (cs_val)
1011                 tqspi->command1_reg |= QSPI_CS_SW_VAL;
1012         else
1013                 tqspi->command1_reg &= ~QSPI_CS_SW_VAL;
1014         tegra_qspi_writel(tqspi, tqspi->command1_reg, QSPI_COMMAND1);
1015         tegra_qspi_writel(tqspi, tqspi->def_command1_reg, QSPI_COMMAND1);
1016 }
1017
1018 static u32 tegra_qspi_cmd_config(bool is_ddr, u8 bus_width, u8 len)
1019 {
1020         u32 cmd_config = 0;
1021
1022         /* Extract Command configuration and value */
1023         if (is_ddr)
1024                 cmd_config |= QSPI_COMMAND_SDR_DDR;
1025         else
1026                 cmd_config &= ~QSPI_COMMAND_SDR_DDR;
1027
1028         cmd_config |= QSPI_COMMAND_X1_X2_X4(bus_width);
1029         cmd_config |= QSPI_COMMAND_SIZE_SET((len * 8) - 1);
1030
1031         return cmd_config;
1032 }
1033
1034 static u32 tegra_qspi_addr_config(bool is_ddr, u8 bus_width, u8 len)
1035 {
1036         u32 addr_config = 0;
1037
1038         /* Extract Address configuration and value */
1039         is_ddr = 0; //Only SDR mode supported
1040         bus_width = 0; //X1 mode
1041
1042         if (is_ddr)
1043                 addr_config |= QSPI_ADDRESS_SDR_DDR;
1044         else
1045                 addr_config &= ~QSPI_ADDRESS_SDR_DDR;
1046
1047         addr_config |= QSPI_ADDRESS_X1_X2_X4(bus_width);
1048         addr_config |= QSPI_ADDRESS_SIZE_SET((len * 8) - 1);
1049
1050         return addr_config;
1051 }
1052
1053 static int tegra_qspi_combined_seq_xfer(struct tegra_qspi *tqspi,
1054                                         struct spi_message *msg)
1055 {
1056         bool is_first_msg = true;
1057         struct spi_transfer *xfer;
1058         struct spi_device *spi = msg->spi;
1059         u8 transfer_phase = 0;
1060         u32 cmd1 = 0, dma_ctl = 0;
1061         int ret = 0;
1062         u32 address_value = 0;
1063         u32 cmd_config = 0, addr_config = 0;
1064         u8 cmd_value = 0, val = 0;
1065
1066         /* Enable Combined sequence mode */
1067         val = tegra_qspi_readl(tqspi, QSPI_GLOBAL_CONFIG);
1068         val |= QSPI_CMB_SEQ_EN;
1069         tegra_qspi_writel(tqspi, val, QSPI_GLOBAL_CONFIG);
1070         /* Process individual transfer list */
1071         list_for_each_entry(xfer, &msg->transfers, transfer_list) {
1072                 switch (transfer_phase) {
1073                 case CMD_TRANSFER:
1074                         /* X1 SDR mode */
1075                         cmd_config = tegra_qspi_cmd_config(false, 0,
1076                                                            xfer->len);
1077                         cmd_value = *((const u8 *)(xfer->tx_buf));
1078                         break;
1079                 case ADDR_TRANSFER:
1080                         /* X1 SDR mode */
1081                         addr_config = tegra_qspi_addr_config(false, 0,
1082                                                              xfer->len);
1083                         address_value = *((const u32 *)(xfer->tx_buf));
1084                         break;
1085                 case DATA_TRANSFER:
1086                         /* Program Command, Address value in register */
1087                         tegra_qspi_writel(tqspi, cmd_value, QSPI_CMB_SEQ_CMD);
1088                         tegra_qspi_writel(tqspi, address_value,
1089                                           QSPI_CMB_SEQ_ADDR);
1090                         /* Program Command and Address config in register */
1091                         tegra_qspi_writel(tqspi, cmd_config,
1092                                           QSPI_CMB_SEQ_CMD_CFG);
1093                         tegra_qspi_writel(tqspi, addr_config,
1094                                           QSPI_CMB_SEQ_ADDR_CFG);
1095
1096                         reinit_completion(&tqspi->xfer_completion);
1097                         cmd1 = tegra_qspi_setup_transfer_one(spi, xfer,
1098                                                              is_first_msg);
1099                         ret = tegra_qspi_start_transfer_one(spi, xfer,
1100                                                             cmd1);
1101
1102                         if (ret < 0) {
1103                                 dev_err(tqspi->dev, "Failed to start transfer-one: %d\n",
1104                                         ret);
1105                                 return ret;
1106                         }
1107
1108                         is_first_msg = false;
1109                         ret = wait_for_completion_timeout
1110                                         (&tqspi->xfer_completion,
1111                                         QSPI_DMA_TIMEOUT);
1112
1113                         if (WARN_ON(ret == 0)) {
1114                                 dev_err(tqspi->dev, "QSPI Transfer failed with timeout: %d\n",
1115                                         ret);
1116                                 if (tqspi->is_curr_dma_xfer &&
1117                                     (tqspi->cur_direction & DATA_DIR_TX))
1118                                         dmaengine_terminate_all
1119                                                 (tqspi->tx_dma_chan);
1120
1121                                 if (tqspi->is_curr_dma_xfer &&
1122                                     (tqspi->cur_direction & DATA_DIR_RX))
1123                                         dmaengine_terminate_all
1124                                                 (tqspi->rx_dma_chan);
1125
1126                                 /* Abort transfer by resetting pio/dma bit */
1127                                 if (!tqspi->is_curr_dma_xfer) {
1128                                         cmd1 = tegra_qspi_readl
1129                                                         (tqspi,
1130                                                          QSPI_COMMAND1);
1131                                         cmd1 &= ~QSPI_PIO;
1132                                         tegra_qspi_writel
1133                                                         (tqspi, cmd1,
1134                                                          QSPI_COMMAND1);
1135                                 } else {
1136                                         dma_ctl = tegra_qspi_readl
1137                                                         (tqspi,
1138                                                          QSPI_DMA_CTL);
1139                                         dma_ctl &= ~QSPI_DMA_EN;
1140                                         tegra_qspi_writel(tqspi, dma_ctl,
1141                                                           QSPI_DMA_CTL);
1142                                 }
1143
1144                                 /* Reset controller if timeout happens */
1145                                 if (device_reset(tqspi->dev) < 0)
1146                                         dev_warn_once(tqspi->dev,
1147                                                       "device reset failed\n");
1148                                 ret = -EIO;
1149                                 goto exit;
1150                         }
1151
1152                         if (tqspi->tx_status ||  tqspi->rx_status) {
1153                                 dev_err(tqspi->dev, "QSPI Transfer failed\n");
1154                                 tqspi->tx_status = 0;
1155                                 tqspi->rx_status = 0;
1156                                 ret = -EIO;
1157                                 goto exit;
1158                         }
1159                         break;
1160                 default:
1161                         ret = -EINVAL;
1162                         goto exit;
1163                 }
1164                 msg->actual_length += xfer->len;
1165                 transfer_phase++;
1166         }
1167         if (!xfer->cs_change) {
1168                 tegra_qspi_transfer_end(spi);
1169                 spi_transfer_delay_exec(xfer);
1170         }
1171         ret = 0;
1172
1173 exit:
1174         msg->status = ret;
1175
1176         return ret;
1177 }
1178
1179 static int tegra_qspi_non_combined_seq_xfer(struct tegra_qspi *tqspi,
1180                                             struct spi_message *msg)
1181 {
1182         struct spi_device *spi = msg->spi;
1183         struct spi_transfer *transfer;
1184         bool is_first_msg = true;
1185         int ret = 0, val = 0;
1186
1187         msg->status = 0;
1188         msg->actual_length = 0;
1189         tqspi->tx_status = 0;
1190         tqspi->rx_status = 0;
1191
1192         /* Disable Combined sequence mode */
1193         val = tegra_qspi_readl(tqspi, QSPI_GLOBAL_CONFIG);
1194         val &= ~QSPI_CMB_SEQ_EN;
1195         tegra_qspi_writel(tqspi, val, QSPI_GLOBAL_CONFIG);
1196         list_for_each_entry(transfer, &msg->transfers, transfer_list) {
1197                 struct spi_transfer *xfer = transfer;
1198                 u8 dummy_bytes = 0;
1199                 u32 cmd1;
1200
1201                 tqspi->dummy_cycles = 0;
1202                 /*
1203                  * Tegra QSPI hardware supports dummy bytes transfer after actual transfer
1204                  * bytes based on programmed dummy clock cycles in the QSPI_MISC register.
1205                  * So, check if the next transfer is dummy data transfer and program dummy
1206                  * clock cycles along with the current transfer and skip next transfer.
1207                  */
1208                 if (!list_is_last(&xfer->transfer_list, &msg->transfers)) {
1209                         struct spi_transfer *next_xfer;
1210
1211                         next_xfer = list_next_entry(xfer, transfer_list);
1212                         if (next_xfer->dummy_data) {
1213                                 u32 dummy_cycles = next_xfer->len * 8 / next_xfer->tx_nbits;
1214
1215                                 if (dummy_cycles <= QSPI_DUMMY_CYCLES_MAX) {
1216                                         tqspi->dummy_cycles = dummy_cycles;
1217                                         dummy_bytes = next_xfer->len;
1218                                         transfer = next_xfer;
1219                                 }
1220                         }
1221                 }
1222
1223                 reinit_completion(&tqspi->xfer_completion);
1224
1225                 cmd1 = tegra_qspi_setup_transfer_one(spi, xfer, is_first_msg);
1226
1227                 ret = tegra_qspi_start_transfer_one(spi, xfer, cmd1);
1228                 if (ret < 0) {
1229                         dev_err(tqspi->dev, "failed to start transfer: %d\n", ret);
1230                         goto complete_xfer;
1231                 }
1232
1233                 ret = wait_for_completion_timeout(&tqspi->xfer_completion,
1234                                                   QSPI_DMA_TIMEOUT);
1235                 if (WARN_ON(ret == 0)) {
1236                         dev_err(tqspi->dev, "transfer timeout\n");
1237                         if (tqspi->is_curr_dma_xfer && (tqspi->cur_direction & DATA_DIR_TX))
1238                                 dmaengine_terminate_all(tqspi->tx_dma_chan);
1239                         if (tqspi->is_curr_dma_xfer && (tqspi->cur_direction & DATA_DIR_RX))
1240                                 dmaengine_terminate_all(tqspi->rx_dma_chan);
1241                         tegra_qspi_handle_error(tqspi);
1242                         ret = -EIO;
1243                         goto complete_xfer;
1244                 }
1245
1246                 if (tqspi->tx_status ||  tqspi->rx_status) {
1247                         tegra_qspi_handle_error(tqspi);
1248                         ret = -EIO;
1249                         goto complete_xfer;
1250                 }
1251
1252                 msg->actual_length += xfer->len + dummy_bytes;
1253
1254 complete_xfer:
1255                 if (ret < 0) {
1256                         tegra_qspi_transfer_end(spi);
1257                         spi_transfer_delay_exec(xfer);
1258                         goto exit;
1259                 }
1260
1261                 if (list_is_last(&xfer->transfer_list, &msg->transfers)) {
1262                         /* de-activate CS after last transfer only when cs_change is not set */
1263                         if (!xfer->cs_change) {
1264                                 tegra_qspi_transfer_end(spi);
1265                                 spi_transfer_delay_exec(xfer);
1266                         }
1267                 } else if (xfer->cs_change) {
1268                          /* de-activated CS between the transfers only when cs_change is set */
1269                         tegra_qspi_transfer_end(spi);
1270                         spi_transfer_delay_exec(xfer);
1271                 }
1272         }
1273
1274         ret = 0;
1275 exit:
1276         msg->status = ret;
1277
1278         return ret;
1279 }
1280
1281 static bool tegra_qspi_validate_cmb_seq(struct tegra_qspi *tqspi,
1282                                         struct spi_message *msg)
1283 {
1284         int transfer_count = 0;
1285         struct spi_transfer *xfer;
1286
1287         list_for_each_entry(xfer, &msg->transfers, transfer_list) {
1288                 transfer_count++;
1289         }
1290         if (!tqspi->soc_data->cmb_xfer_capable || transfer_count != 3)
1291                 return false;
1292         xfer = list_first_entry(&msg->transfers, typeof(*xfer),
1293                                 transfer_list);
1294         if (xfer->len > 2)
1295                 return false;
1296         xfer = list_next_entry(xfer, transfer_list);
1297         if (xfer->len > 4 || xfer->len < 3)
1298                 return false;
1299         xfer = list_next_entry(xfer, transfer_list);
1300         if (!tqspi->soc_data->has_dma || xfer->len > (QSPI_FIFO_DEPTH << 2))
1301                 return false;
1302
1303         return true;
1304 }
1305
1306 static int tegra_qspi_transfer_one_message(struct spi_master *master,
1307                                            struct spi_message *msg)
1308 {
1309         struct tegra_qspi *tqspi = spi_master_get_devdata(master);
1310         int ret;
1311
1312         if (tegra_qspi_validate_cmb_seq(tqspi, msg))
1313                 ret = tegra_qspi_combined_seq_xfer(tqspi, msg);
1314         else
1315                 ret = tegra_qspi_non_combined_seq_xfer(tqspi, msg);
1316
1317         spi_finalize_current_message(master);
1318
1319         return ret;
1320 }
1321
1322 static irqreturn_t handle_cpu_based_xfer(struct tegra_qspi *tqspi)
1323 {
1324         struct spi_transfer *t = tqspi->curr_xfer;
1325         unsigned long flags;
1326
1327         spin_lock_irqsave(&tqspi->lock, flags);
1328
1329         if (tqspi->tx_status ||  tqspi->rx_status) {
1330                 tegra_qspi_handle_error(tqspi);
1331                 complete(&tqspi->xfer_completion);
1332                 goto exit;
1333         }
1334
1335         if (tqspi->cur_direction & DATA_DIR_RX)
1336                 tegra_qspi_read_rx_fifo_to_client_rxbuf(tqspi, t);
1337
1338         if (tqspi->cur_direction & DATA_DIR_TX)
1339                 tqspi->cur_pos = tqspi->cur_tx_pos;
1340         else
1341                 tqspi->cur_pos = tqspi->cur_rx_pos;
1342
1343         if (tqspi->cur_pos == t->len) {
1344                 complete(&tqspi->xfer_completion);
1345                 goto exit;
1346         }
1347
1348         tegra_qspi_calculate_curr_xfer_param(tqspi, t);
1349         tegra_qspi_start_cpu_based_transfer(tqspi, t);
1350 exit:
1351         spin_unlock_irqrestore(&tqspi->lock, flags);
1352         return IRQ_HANDLED;
1353 }
1354
1355 static irqreturn_t handle_dma_based_xfer(struct tegra_qspi *tqspi)
1356 {
1357         struct spi_transfer *t = tqspi->curr_xfer;
1358         unsigned int total_fifo_words;
1359         unsigned long flags;
1360         long wait_status;
1361         int err = 0;
1362
1363         if (tqspi->cur_direction & DATA_DIR_TX) {
1364                 if (tqspi->tx_status) {
1365                         dmaengine_terminate_all(tqspi->tx_dma_chan);
1366                         err += 1;
1367                 } else {
1368                         wait_status = wait_for_completion_interruptible_timeout(
1369                                 &tqspi->tx_dma_complete, QSPI_DMA_TIMEOUT);
1370                         if (wait_status <= 0) {
1371                                 dmaengine_terminate_all(tqspi->tx_dma_chan);
1372                                 dev_err(tqspi->dev, "failed TX DMA transfer\n");
1373                                 err += 1;
1374                         }
1375                 }
1376         }
1377
1378         if (tqspi->cur_direction & DATA_DIR_RX) {
1379                 if (tqspi->rx_status) {
1380                         dmaengine_terminate_all(tqspi->rx_dma_chan);
1381                         err += 2;
1382                 } else {
1383                         wait_status = wait_for_completion_interruptible_timeout(
1384                                 &tqspi->rx_dma_complete, QSPI_DMA_TIMEOUT);
1385                         if (wait_status <= 0) {
1386                                 dmaengine_terminate_all(tqspi->rx_dma_chan);
1387                                 dev_err(tqspi->dev, "failed RX DMA transfer\n");
1388                                 err += 2;
1389                         }
1390                 }
1391         }
1392
1393         spin_lock_irqsave(&tqspi->lock, flags);
1394
1395         if (err) {
1396                 tegra_qspi_dma_unmap_xfer(tqspi, t);
1397                 tegra_qspi_handle_error(tqspi);
1398                 complete(&tqspi->xfer_completion);
1399                 goto exit;
1400         }
1401
1402         if (tqspi->cur_direction & DATA_DIR_RX)
1403                 tegra_qspi_copy_qspi_rxbuf_to_client_rxbuf(tqspi, t);
1404
1405         if (tqspi->cur_direction & DATA_DIR_TX)
1406                 tqspi->cur_pos = tqspi->cur_tx_pos;
1407         else
1408                 tqspi->cur_pos = tqspi->cur_rx_pos;
1409
1410         if (tqspi->cur_pos == t->len) {
1411                 tegra_qspi_dma_unmap_xfer(tqspi, t);
1412                 complete(&tqspi->xfer_completion);
1413                 goto exit;
1414         }
1415
1416         tegra_qspi_dma_unmap_xfer(tqspi, t);
1417
1418         /* continue transfer in current message */
1419         total_fifo_words = tegra_qspi_calculate_curr_xfer_param(tqspi, t);
1420         if (total_fifo_words > QSPI_FIFO_DEPTH)
1421                 err = tegra_qspi_start_dma_based_transfer(tqspi, t);
1422         else
1423                 err = tegra_qspi_start_cpu_based_transfer(tqspi, t);
1424
1425 exit:
1426         spin_unlock_irqrestore(&tqspi->lock, flags);
1427         return IRQ_HANDLED;
1428 }
1429
1430 static irqreturn_t tegra_qspi_isr_thread(int irq, void *context_data)
1431 {
1432         struct tegra_qspi *tqspi = context_data;
1433
1434         tqspi->status_reg = tegra_qspi_readl(tqspi, QSPI_FIFO_STATUS);
1435
1436         if (tqspi->cur_direction & DATA_DIR_TX)
1437                 tqspi->tx_status = tqspi->status_reg & (QSPI_TX_FIFO_UNF | QSPI_TX_FIFO_OVF);
1438
1439         if (tqspi->cur_direction & DATA_DIR_RX)
1440                 tqspi->rx_status = tqspi->status_reg & (QSPI_RX_FIFO_OVF | QSPI_RX_FIFO_UNF);
1441
1442         tegra_qspi_mask_clear_irq(tqspi);
1443
1444         if (!tqspi->is_curr_dma_xfer)
1445                 return handle_cpu_based_xfer(tqspi);
1446
1447         return handle_dma_based_xfer(tqspi);
1448 }
1449
1450 static struct tegra_qspi_soc_data tegra210_qspi_soc_data = {
1451         .has_dma = true,
1452         .cmb_xfer_capable = false,
1453         .cs_count = 1,
1454 };
1455
1456 static struct tegra_qspi_soc_data tegra186_qspi_soc_data = {
1457         .has_dma = true,
1458         .cmb_xfer_capable = true,
1459         .cs_count = 1,
1460 };
1461
1462 static struct tegra_qspi_soc_data tegra234_qspi_soc_data = {
1463         .has_dma = false,
1464         .cmb_xfer_capable = true,
1465         .cs_count = 1,
1466 };
1467
1468 static struct tegra_qspi_soc_data tegra241_qspi_soc_data = {
1469         .has_dma = false,
1470         .cmb_xfer_capable = true,
1471         .cs_count = 4,
1472 };
1473
1474 static const struct of_device_id tegra_qspi_of_match[] = {
1475         {
1476                 .compatible = "nvidia,tegra210-qspi",
1477                 .data       = &tegra210_qspi_soc_data,
1478         }, {
1479                 .compatible = "nvidia,tegra186-qspi",
1480                 .data       = &tegra186_qspi_soc_data,
1481         }, {
1482                 .compatible = "nvidia,tegra194-qspi",
1483                 .data       = &tegra186_qspi_soc_data,
1484         }, {
1485                 .compatible = "nvidia,tegra234-qspi",
1486                 .data       = &tegra234_qspi_soc_data,
1487         }, {
1488                 .compatible = "nvidia,tegra241-qspi",
1489                 .data       = &tegra241_qspi_soc_data,
1490         },
1491         {}
1492 };
1493
1494 MODULE_DEVICE_TABLE(of, tegra_qspi_of_match);
1495
1496 #ifdef CONFIG_ACPI
1497 static const struct acpi_device_id tegra_qspi_acpi_match[] = {
1498         {
1499                 .id = "NVDA1213",
1500                 .driver_data = (kernel_ulong_t)&tegra210_qspi_soc_data,
1501         }, {
1502                 .id = "NVDA1313",
1503                 .driver_data = (kernel_ulong_t)&tegra186_qspi_soc_data,
1504         }, {
1505                 .id = "NVDA1413",
1506                 .driver_data = (kernel_ulong_t)&tegra234_qspi_soc_data,
1507         }, {
1508                 .id = "NVDA1513",
1509                 .driver_data = (kernel_ulong_t)&tegra241_qspi_soc_data,
1510         },
1511         {}
1512 };
1513
1514 MODULE_DEVICE_TABLE(acpi, tegra_qspi_acpi_match);
1515 #endif
1516
1517 static int tegra_qspi_probe(struct platform_device *pdev)
1518 {
1519         struct spi_master       *master;
1520         struct tegra_qspi       *tqspi;
1521         struct resource         *r;
1522         int ret, qspi_irq;
1523         int bus_num;
1524
1525         master = devm_spi_alloc_master(&pdev->dev, sizeof(*tqspi));
1526         if (!master)
1527                 return -ENOMEM;
1528
1529         platform_set_drvdata(pdev, master);
1530         tqspi = spi_master_get_devdata(master);
1531
1532         master->mode_bits = SPI_MODE_0 | SPI_MODE_3 | SPI_CS_HIGH |
1533                             SPI_TX_DUAL | SPI_RX_DUAL | SPI_TX_QUAD | SPI_RX_QUAD;
1534         master->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(16) | SPI_BPW_MASK(8);
1535         master->setup = tegra_qspi_setup;
1536         master->transfer_one_message = tegra_qspi_transfer_one_message;
1537         master->num_chipselect = 1;
1538         master->auto_runtime_pm = true;
1539
1540         bus_num = of_alias_get_id(pdev->dev.of_node, "spi");
1541         if (bus_num >= 0)
1542                 master->bus_num = bus_num;
1543
1544         tqspi->master = master;
1545         tqspi->dev = &pdev->dev;
1546         spin_lock_init(&tqspi->lock);
1547
1548         tqspi->soc_data = device_get_match_data(&pdev->dev);
1549         master->num_chipselect = tqspi->soc_data->cs_count;
1550         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1551         tqspi->base = devm_ioremap_resource(&pdev->dev, r);
1552         if (IS_ERR(tqspi->base))
1553                 return PTR_ERR(tqspi->base);
1554
1555         tqspi->phys = r->start;
1556         qspi_irq = platform_get_irq(pdev, 0);
1557         if (qspi_irq < 0)
1558                 return qspi_irq;
1559         tqspi->irq = qspi_irq;
1560
1561         if (!has_acpi_companion(tqspi->dev)) {
1562                 tqspi->clk = devm_clk_get(&pdev->dev, "qspi");
1563                 if (IS_ERR(tqspi->clk)) {
1564                         ret = PTR_ERR(tqspi->clk);
1565                         dev_err(&pdev->dev, "failed to get clock: %d\n", ret);
1566                         return ret;
1567                 }
1568
1569         }
1570
1571         tqspi->max_buf_size = QSPI_FIFO_DEPTH << 2;
1572         tqspi->dma_buf_size = DEFAULT_QSPI_DMA_BUF_LEN;
1573
1574         ret = tegra_qspi_init_dma(tqspi);
1575         if (ret < 0)
1576                 return ret;
1577
1578         if (tqspi->use_dma)
1579                 tqspi->max_buf_size = tqspi->dma_buf_size;
1580
1581         init_completion(&tqspi->tx_dma_complete);
1582         init_completion(&tqspi->rx_dma_complete);
1583         init_completion(&tqspi->xfer_completion);
1584
1585         pm_runtime_enable(&pdev->dev);
1586         ret = pm_runtime_resume_and_get(&pdev->dev);
1587         if (ret < 0) {
1588                 dev_err(&pdev->dev, "failed to get runtime PM: %d\n", ret);
1589                 goto exit_pm_disable;
1590         }
1591
1592         if (device_reset(tqspi->dev) < 0)
1593                 dev_warn_once(tqspi->dev, "device reset failed\n");
1594
1595         tqspi->def_command1_reg = QSPI_M_S | QSPI_CS_SW_HW |  QSPI_CS_SW_VAL;
1596         tegra_qspi_writel(tqspi, tqspi->def_command1_reg, QSPI_COMMAND1);
1597         tqspi->spi_cs_timing1 = tegra_qspi_readl(tqspi, QSPI_CS_TIMING1);
1598         tqspi->spi_cs_timing2 = tegra_qspi_readl(tqspi, QSPI_CS_TIMING2);
1599         tqspi->def_command2_reg = tegra_qspi_readl(tqspi, QSPI_COMMAND2);
1600
1601         pm_runtime_put(&pdev->dev);
1602
1603         ret = request_threaded_irq(tqspi->irq, NULL,
1604                                    tegra_qspi_isr_thread, IRQF_ONESHOT,
1605                                    dev_name(&pdev->dev), tqspi);
1606         if (ret < 0) {
1607                 dev_err(&pdev->dev, "failed to request IRQ#%u: %d\n", tqspi->irq, ret);
1608                 goto exit_pm_disable;
1609         }
1610
1611         master->dev.of_node = pdev->dev.of_node;
1612         ret = spi_register_master(master);
1613         if (ret < 0) {
1614                 dev_err(&pdev->dev, "failed to register master: %d\n", ret);
1615                 goto exit_free_irq;
1616         }
1617
1618         return 0;
1619
1620 exit_free_irq:
1621         free_irq(qspi_irq, tqspi);
1622 exit_pm_disable:
1623         pm_runtime_force_suspend(&pdev->dev);
1624         tegra_qspi_deinit_dma(tqspi);
1625         return ret;
1626 }
1627
1628 static int tegra_qspi_remove(struct platform_device *pdev)
1629 {
1630         struct spi_master *master = platform_get_drvdata(pdev);
1631         struct tegra_qspi *tqspi = spi_master_get_devdata(master);
1632
1633         spi_unregister_master(master);
1634         free_irq(tqspi->irq, tqspi);
1635         pm_runtime_force_suspend(&pdev->dev);
1636         tegra_qspi_deinit_dma(tqspi);
1637
1638         return 0;
1639 }
1640
1641 static int __maybe_unused tegra_qspi_suspend(struct device *dev)
1642 {
1643         struct spi_master *master = dev_get_drvdata(dev);
1644
1645         return spi_master_suspend(master);
1646 }
1647
1648 static int __maybe_unused tegra_qspi_resume(struct device *dev)
1649 {
1650         struct spi_master *master = dev_get_drvdata(dev);
1651         struct tegra_qspi *tqspi = spi_master_get_devdata(master);
1652         int ret;
1653
1654         ret = pm_runtime_resume_and_get(dev);
1655         if (ret < 0) {
1656                 dev_err(dev, "failed to get runtime PM: %d\n", ret);
1657                 return ret;
1658         }
1659
1660         tegra_qspi_writel(tqspi, tqspi->command1_reg, QSPI_COMMAND1);
1661         tegra_qspi_writel(tqspi, tqspi->def_command2_reg, QSPI_COMMAND2);
1662         pm_runtime_put(dev);
1663
1664         return spi_master_resume(master);
1665 }
1666
1667 static int __maybe_unused tegra_qspi_runtime_suspend(struct device *dev)
1668 {
1669         struct spi_master *master = dev_get_drvdata(dev);
1670         struct tegra_qspi *tqspi = spi_master_get_devdata(master);
1671
1672         /* Runtime pm disabled with ACPI */
1673         if (has_acpi_companion(tqspi->dev))
1674                 return 0;
1675         /* flush all write which are in PPSB queue by reading back */
1676         tegra_qspi_readl(tqspi, QSPI_COMMAND1);
1677
1678         clk_disable_unprepare(tqspi->clk);
1679
1680         return 0;
1681 }
1682
1683 static int __maybe_unused tegra_qspi_runtime_resume(struct device *dev)
1684 {
1685         struct spi_master *master = dev_get_drvdata(dev);
1686         struct tegra_qspi *tqspi = spi_master_get_devdata(master);
1687         int ret;
1688
1689         /* Runtime pm disabled with ACPI */
1690         if (has_acpi_companion(tqspi->dev))
1691                 return 0;
1692         ret = clk_prepare_enable(tqspi->clk);
1693         if (ret < 0)
1694                 dev_err(tqspi->dev, "failed to enable clock: %d\n", ret);
1695
1696         return ret;
1697 }
1698
1699 static const struct dev_pm_ops tegra_qspi_pm_ops = {
1700         SET_RUNTIME_PM_OPS(tegra_qspi_runtime_suspend, tegra_qspi_runtime_resume, NULL)
1701         SET_SYSTEM_SLEEP_PM_OPS(tegra_qspi_suspend, tegra_qspi_resume)
1702 };
1703
1704 static struct platform_driver tegra_qspi_driver = {
1705         .driver = {
1706                 .name           = "tegra-qspi",
1707                 .pm             = &tegra_qspi_pm_ops,
1708                 .of_match_table = tegra_qspi_of_match,
1709                 .acpi_match_table = ACPI_PTR(tegra_qspi_acpi_match),
1710         },
1711         .probe =        tegra_qspi_probe,
1712         .remove =       tegra_qspi_remove,
1713 };
1714 module_platform_driver(tegra_qspi_driver);
1715
1716 MODULE_ALIAS("platform:qspi-tegra");
1717 MODULE_DESCRIPTION("NVIDIA Tegra QSPI Controller Driver");
1718 MODULE_AUTHOR("Sowjanya Komatineni <skomatineni@nvidia.com>");
1719 MODULE_LICENSE("GPL v2");