drivers/spi/spi-geni-qcom.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (c) 2017-2018, The Linux foundation. All rights reserved.
   3
   4 #include <linux/clk.h>
   5 #include <linux/interrupt.h>
   6 #include <linux/io.h>
   7 #include <linux/log2.h>
   8 #include <linux/module.h>
   9 #include <linux/of.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/pm_runtime.h>
  12 #include <linux/qcom-geni-se.h>
  13 #include <linux/spi/spi.h>
  14 #include <linux/spinlock.h>
  15
  16 /* SPI SE specific registers and respective register fields */
  17 #define SE_SPI_CPHA             0x224
  18 #define CPHA                    BIT(0)
  19
  20 #define SE_SPI_LOOPBACK         0x22c
  21 #define LOOPBACK_ENABLE         0x1
  22 #define NORMAL_MODE             0x0
  23 #define LOOPBACK_MSK            GENMASK(1, 0)
  24
  25 #define SE_SPI_CPOL             0x230
  26 #define CPOL                    BIT(2)
  27
  28 #define SE_SPI_DEMUX_OUTPUT_INV 0x24c
  29 #define CS_DEMUX_OUTPUT_INV_MSK GENMASK(3, 0)
  30
  31 #define SE_SPI_DEMUX_SEL        0x250
  32 #define CS_DEMUX_OUTPUT_SEL     GENMASK(3, 0)
  33
  34 #define SE_SPI_TRANS_CFG        0x25c
  35 #define CS_TOGGLE               BIT(0)
  36
  37 #define SE_SPI_WORD_LEN         0x268
  38 #define WORD_LEN_MSK            GENMASK(9, 0)
  39 #define MIN_WORD_LEN            4
  40
  41 #define SE_SPI_TX_TRANS_LEN     0x26c
  42 #define SE_SPI_RX_TRANS_LEN     0x270
  43 #define TRANS_LEN_MSK           GENMASK(23, 0)
  44
  45 #define SE_SPI_PRE_POST_CMD_DLY 0x274
  46
  47 #define SE_SPI_DELAY_COUNTERS   0x278
  48 #define SPI_INTER_WORDS_DELAY_MSK       GENMASK(9, 0)
  49 #define SPI_CS_CLK_DELAY_MSK            GENMASK(19, 10)
  50 #define SPI_CS_CLK_DELAY_SHFT           10
  51
  52 /* M_CMD OP codes for SPI */
  53 #define SPI_TX_ONLY             1
  54 #define SPI_RX_ONLY             2
  55 #define SPI_FULL_DUPLEX         3
  56 #define SPI_TX_RX               7
  57 #define SPI_CS_ASSERT           8
  58 #define SPI_CS_DEASSERT         9
  59 #define SPI_SCK_ONLY            10
  60 /* M_CMD params for SPI */
  61 #define SPI_PRE_CMD_DELAY       BIT(0)
  62 #define TIMESTAMP_BEFORE        BIT(1)
  63 #define FRAGMENTATION           BIT(2)
  64 #define TIMESTAMP_AFTER         BIT(3)
  65 #define POST_CMD_DELAY          BIT(4)
  66
  67 enum spi_m_cmd_opcode {
  68         CMD_NONE,
  69         CMD_XFER,
  70         CMD_CS,
  71         CMD_CANCEL,
  72 };
  73
  74 struct spi_geni_master {
  75         struct geni_se se;
  76         struct device *dev;
  77         u32 tx_fifo_depth;
  78         u32 fifo_width_bits;
  79         u32 tx_wm;
  80         unsigned long cur_speed_hz;
  81         unsigned int cur_bits_per_word;
  82         unsigned int tx_rem_bytes;
  83         unsigned int rx_rem_bytes;
  84         const struct spi_transfer *cur_xfer;
  85         struct completion xfer_done;
  86         unsigned int oversampling;
  87         spinlock_t lock;
  88         enum spi_m_cmd_opcode cur_mcmd;
  89         int irq;
  90 };
  91
  92 static int get_spi_clk_cfg(unsigned int speed_hz,
  93                         struct spi_geni_master *mas,
  94                         unsigned int *clk_idx,
  95                         unsigned int *clk_div)
  96 {
  97         unsigned long sclk_freq;
  98         unsigned int actual_hz;
  99         struct geni_se *se = &mas->se;
 100         int ret;
 101
 102         ret = geni_se_clk_freq_match(&mas->se,
 103                                 speed_hz * mas->oversampling,
 104                                 clk_idx, &sclk_freq, false);
 105         if (ret) {
 106                 dev_err(mas->dev, "Failed(%d) to find src clk for %dHz\n",
 107                                                         ret, speed_hz);
 108                 return ret;
 109         }
 110
 111         *clk_div = DIV_ROUND_UP(sclk_freq, mas->oversampling * speed_hz);
 112         actual_hz = sclk_freq / (mas->oversampling * *clk_div);
 113
 114         dev_dbg(mas->dev, "req %u=>%u sclk %lu, idx %d, div %d\n", speed_hz,
 115                                 actual_hz, sclk_freq, *clk_idx, *clk_div);
 116         ret = clk_set_rate(se->clk, sclk_freq);
 117         if (ret)
 118                 dev_err(mas->dev, "clk_set_rate failed %d\n", ret);
 119         return ret;
 120 }
 121
 122 static void handle_fifo_timeout(struct spi_master *spi,
 123                                 struct spi_message *msg)
 124 {
 125         struct spi_geni_master *mas = spi_master_get_devdata(spi);
 126         unsigned long time_left, flags;
 127         struct geni_se *se = &mas->se;
 128
 129         spin_lock_irqsave(&mas->lock, flags);
 130         reinit_completion(&mas->xfer_done);
 131         mas->cur_mcmd = CMD_CANCEL;
 132         geni_se_cancel_m_cmd(se);
 133         writel(0, se->base + SE_GENI_TX_WATERMARK_REG);
 134         spin_unlock_irqrestore(&mas->lock, flags);
 135         time_left = wait_for_completion_timeout(&mas->xfer_done, HZ);
 136         if (time_left)
 137                 return;
 138
 139         spin_lock_irqsave(&mas->lock, flags);
 140         reinit_completion(&mas->xfer_done);
 141         geni_se_abort_m_cmd(se);
 142         spin_unlock_irqrestore(&mas->lock, flags);
 143         time_left = wait_for_completion_timeout(&mas->xfer_done, HZ);
 144         if (!time_left)
 145                 dev_err(mas->dev, "Failed to cancel/abort m_cmd\n");
 146 }
 147
 148 static void spi_geni_set_cs(struct spi_device *slv, bool set_flag)
 149 {
 150         struct spi_geni_master *mas = spi_master_get_devdata(slv->master);
 151         struct spi_master *spi = dev_get_drvdata(mas->dev);
 152         struct geni_se *se = &mas->se;
 153         unsigned long time_left;
 154
 155         reinit_completion(&mas->xfer_done);
 156         pm_runtime_get_sync(mas->dev);
 157         if (!(slv->mode & SPI_CS_HIGH))
 158                 set_flag = !set_flag;
 159
 160         mas->cur_mcmd = CMD_CS;
 161         if (set_flag)
 162                 geni_se_setup_m_cmd(se, SPI_CS_ASSERT, 0);
 163         else
 164                 geni_se_setup_m_cmd(se, SPI_CS_DEASSERT, 0);
 165
 166         time_left = wait_for_completion_timeout(&mas->xfer_done, HZ);
 167         if (!time_left)
 168                 handle_fifo_timeout(spi, NULL);
 169
 170         pm_runtime_put(mas->dev);
 171 }
 172
 173 static void spi_setup_word_len(struct spi_geni_master *mas, u16 mode,
 174                                         unsigned int bits_per_word)
 175 {
 176         unsigned int pack_words;
 177         bool msb_first = (mode & SPI_LSB_FIRST) ? false : true;
 178         struct geni_se *se = &mas->se;
 179         u32 word_len;
 180
 181         word_len = readl(se->base + SE_SPI_WORD_LEN);
 182
 183         /*
 184          * If bits_per_word isn't a byte aligned value, set the packing to be
 185          * 1 SPI word per FIFO word.
 186          */
 187         if (!(mas->fifo_width_bits % bits_per_word))
 188                 pack_words = mas->fifo_width_bits / bits_per_word;
 189         else
 190                 pack_words = 1;
 191         word_len &= ~WORD_LEN_MSK;
 192         word_len |= ((bits_per_word - MIN_WORD_LEN) & WORD_LEN_MSK);
 193         geni_se_config_packing(&mas->se, bits_per_word, pack_words, msb_first,
 194                                                                 true, true);
 195         writel(word_len, se->base + SE_SPI_WORD_LEN);
 196 }
 197
 198 static int setup_fifo_params(struct spi_device *spi_slv,
 199                                         struct spi_master *spi)
 200 {
 201         struct spi_geni_master *mas = spi_master_get_devdata(spi);
 202         struct geni_se *se = &mas->se;
 203         u32 loopback_cfg, cpol, cpha, demux_output_inv;
 204         u32 demux_sel, clk_sel, m_clk_cfg, idx, div;
 205         int ret;
 206
 207         loopback_cfg = readl(se->base + SE_SPI_LOOPBACK);
 208         cpol = readl(se->base + SE_SPI_CPOL);
 209         cpha = readl(se->base + SE_SPI_CPHA);
 210         demux_output_inv = 0;
 211         loopback_cfg &= ~LOOPBACK_MSK;
 212         cpol &= ~CPOL;
 213         cpha &= ~CPHA;
 214
 215         if (spi_slv->mode & SPI_LOOP)
 216                 loopback_cfg |= LOOPBACK_ENABLE;
 217
 218         if (spi_slv->mode & SPI_CPOL)
 219                 cpol |= CPOL;
 220
 221         if (spi_slv->mode & SPI_CPHA)
 222                 cpha |= CPHA;
 223
 224         if (spi_slv->mode & SPI_CS_HIGH)
 225                 demux_output_inv = BIT(spi_slv->chip_select);
 226
 227         demux_sel = spi_slv->chip_select;
 228         mas->cur_speed_hz = spi_slv->max_speed_hz;
 229         mas->cur_bits_per_word = spi_slv->bits_per_word;
 230
 231         ret = get_spi_clk_cfg(mas->cur_speed_hz, mas, &idx, &div);
 232         if (ret) {
 233                 dev_err(mas->dev, "Err setting clks ret(%d) for %ld\n",
 234                                                         ret, mas->cur_speed_hz);
 235                 return ret;
 236         }
 237
 238         clk_sel = idx & CLK_SEL_MSK;
 239         m_clk_cfg = (div << CLK_DIV_SHFT) | SER_CLK_EN;
 240         spi_setup_word_len(mas, spi_slv->mode, spi_slv->bits_per_word);
 241         writel(loopback_cfg, se->base + SE_SPI_LOOPBACK);
 242         writel(demux_sel, se->base + SE_SPI_DEMUX_SEL);
 243         writel(cpha, se->base + SE_SPI_CPHA);
 244         writel(cpol, se->base + SE_SPI_CPOL);
 245         writel(demux_output_inv, se->base + SE_SPI_DEMUX_OUTPUT_INV);
 246         writel(clk_sel, se->base + SE_GENI_CLK_SEL);
 247         writel(m_clk_cfg, se->base + GENI_SER_M_CLK_CFG);
 248         return 0;
 249 }
 250
 251 static int spi_geni_prepare_message(struct spi_master *spi,
 252                                         struct spi_message *spi_msg)
 253 {
 254         int ret;
 255         struct spi_geni_master *mas = spi_master_get_devdata(spi);
 256         struct geni_se *se = &mas->se;
 257
 258         geni_se_select_mode(se, GENI_SE_FIFO);
 259         ret = setup_fifo_params(spi_msg->spi, spi);
 260         if (ret)
 261                 dev_err(mas->dev, "Couldn't select mode %d\n", ret);
 262         return ret;
 263 }
 264
 265 static int spi_geni_init(struct spi_geni_master *mas)
 266 {
 267         struct geni_se *se = &mas->se;
 268         unsigned int proto, major, minor, ver;
 269
 270         pm_runtime_get_sync(mas->dev);
 271
 272         proto = geni_se_read_proto(se);
 273         if (proto != GENI_SE_SPI) {
 274                 dev_err(mas->dev, "Invalid proto %d\n", proto);
 275                 pm_runtime_put(mas->dev);
 276                 return -ENXIO;
 277         }
 278         mas->tx_fifo_depth = geni_se_get_tx_fifo_depth(se);
 279
 280         /* Width of Tx and Rx FIFO is same */
 281         mas->fifo_width_bits = geni_se_get_tx_fifo_width(se);
 282
 283         /*
 284          * Hardware programming guide suggests to configure
 285          * RX FIFO RFR level to fifo_depth-2.
 286          */
 287         geni_se_init(se, 0x0, mas->tx_fifo_depth - 2);
 288         /* Transmit an entire FIFO worth of data per IRQ */
 289         mas->tx_wm = 1;
 290         ver = geni_se_get_qup_hw_version(se);
 291         major = GENI_SE_VERSION_MAJOR(ver);
 292         minor = GENI_SE_VERSION_MINOR(ver);
 293
 294         if (major == 1 && minor == 0)
 295                 mas->oversampling = 2;
 296         else
 297                 mas->oversampling = 1;
 298
 299         pm_runtime_put(mas->dev);
 300         return 0;
 301 }
 302
 303 static void setup_fifo_xfer(struct spi_transfer *xfer,
 304                                 struct spi_geni_master *mas,
 305                                 u16 mode, struct spi_master *spi)
 306 {
 307         u32 m_cmd = 0;
 308         u32 spi_tx_cfg, len;
 309         struct geni_se *se = &mas->se;
 310
 311         spi_tx_cfg = readl(se->base + SE_SPI_TRANS_CFG);
 312         if (xfer->bits_per_word != mas->cur_bits_per_word) {
 313                 spi_setup_word_len(mas, mode, xfer->bits_per_word);
 314                 mas->cur_bits_per_word = xfer->bits_per_word;
 315         }
 316
 317         /* Speed and bits per word can be overridden per transfer */
 318         if (xfer->speed_hz != mas->cur_speed_hz) {
 319                 int ret;
 320                 u32 clk_sel, m_clk_cfg;
 321                 unsigned int idx, div;
 322
 323                 ret = get_spi_clk_cfg(xfer->speed_hz, mas, &idx, &div);
 324                 if (ret) {
 325                         dev_err(mas->dev, "Err setting clks:%d\n", ret);
 326                         return;
 327                 }
 328                 /*
 329                  * SPI core clock gets configured with the requested frequency
 330                  * or the frequency closer to the requested frequency.
 331                  * For that reason requested frequency is stored in the
 332                  * cur_speed_hz and referred in the consecutive transfer instead
 333                  * of calling clk_get_rate() API.
 334                  */
 335                 mas->cur_speed_hz = xfer->speed_hz;
 336                 clk_sel = idx & CLK_SEL_MSK;
 337                 m_clk_cfg = (div << CLK_DIV_SHFT) | SER_CLK_EN;
 338                 writel(clk_sel, se->base + SE_GENI_CLK_SEL);
 339                 writel(m_clk_cfg, se->base + GENI_SER_M_CLK_CFG);
 340         }
 341
 342         mas->tx_rem_bytes = 0;
 343         mas->rx_rem_bytes = 0;
 344         if (xfer->tx_buf && xfer->rx_buf)
 345                 m_cmd = SPI_FULL_DUPLEX;
 346         else if (xfer->tx_buf)
 347                 m_cmd = SPI_TX_ONLY;
 348         else if (xfer->rx_buf)
 349                 m_cmd = SPI_RX_ONLY;
 350
 351         spi_tx_cfg &= ~CS_TOGGLE;
 352
 353         if (!(mas->cur_bits_per_word % MIN_WORD_LEN))
 354                 len = xfer->len * BITS_PER_BYTE / mas->cur_bits_per_word;
 355         else
 356                 len = xfer->len / (mas->cur_bits_per_word / BITS_PER_BYTE + 1);
 357         len &= TRANS_LEN_MSK;
 358
 359         mas->cur_xfer = xfer;
 360         if (m_cmd & SPI_TX_ONLY) {
 361                 mas->tx_rem_bytes = xfer->len;
 362                 writel(len, se->base + SE_SPI_TX_TRANS_LEN);
 363         }
 364
 365         if (m_cmd & SPI_RX_ONLY) {
 366                 writel(len, se->base + SE_SPI_RX_TRANS_LEN);
 367                 mas->rx_rem_bytes = xfer->len;
 368         }
 369         writel(spi_tx_cfg, se->base + SE_SPI_TRANS_CFG);
 370         mas->cur_mcmd = CMD_XFER;
 371         geni_se_setup_m_cmd(se, m_cmd, FRAGMENTATION);
 372
 373         /*
 374          * TX_WATERMARK_REG should be set after SPI configuration and
 375          * setting up GENI SE engine, as driver starts data transfer
 376          * for the watermark interrupt.
 377          */
 378         if (m_cmd & SPI_TX_ONLY)
 379                 writel(mas->tx_wm, se->base + SE_GENI_TX_WATERMARK_REG);
 380 }
 381
 382 static int spi_geni_transfer_one(struct spi_master *spi,
 383                                 struct spi_device *slv,
 384                                 struct spi_transfer *xfer)
 385 {
 386         struct spi_geni_master *mas = spi_master_get_devdata(spi);
 387
 388         /* Terminate and return success for 0 byte length transfer */
 389         if (!xfer->len)
 390                 return 0;
 391
 392         setup_fifo_xfer(xfer, mas, slv->mode, spi);
 393         return 1;
 394 }
 395
 396 static unsigned int geni_byte_per_fifo_word(struct spi_geni_master *mas)
 397 {
 398         /*
 399          * Calculate how many bytes we'll put in each FIFO word.  If the
 400          * transfer words don't pack cleanly into a FIFO word we'll just put
 401          * one transfer word in each FIFO word.  If they do pack we'll pack 'em.
 402          */
 403         if (mas->fifo_width_bits % mas->cur_bits_per_word)
 404                 return roundup_pow_of_two(DIV_ROUND_UP(mas->cur_bits_per_word,
 405                                                        BITS_PER_BYTE));
 406
 407         return mas->fifo_width_bits / BITS_PER_BYTE;
 408 }
 409
 410 static void geni_spi_handle_tx(struct spi_geni_master *mas)
 411 {
 412         struct geni_se *se = &mas->se;
 413         unsigned int max_bytes;
 414         const u8 *tx_buf;
 415         unsigned int bytes_per_fifo_word = geni_byte_per_fifo_word(mas);
 416         unsigned int i = 0;
 417
 418         max_bytes = (mas->tx_fifo_depth - mas->tx_wm) * bytes_per_fifo_word;
 419         if (mas->tx_rem_bytes < max_bytes)
 420                 max_bytes = mas->tx_rem_bytes;
 421
 422         tx_buf = mas->cur_xfer->tx_buf + mas->cur_xfer->len - mas->tx_rem_bytes;
 423         while (i < max_bytes) {
 424                 unsigned int j;
 425                 unsigned int bytes_to_write;
 426                 u32 fifo_word = 0;
 427                 u8 *fifo_byte = (u8 *)&fifo_word;
 428
 429                 bytes_to_write = min(bytes_per_fifo_word, max_bytes - i);
 430                 for (j = 0; j < bytes_to_write; j++)
 431                         fifo_byte[j] = tx_buf[i++];
 432                 iowrite32_rep(se->base + SE_GENI_TX_FIFOn, &fifo_word, 1);
 433         }
 434         mas->tx_rem_bytes -= max_bytes;
 435         if (!mas->tx_rem_bytes)
 436                 writel(0, se->base + SE_GENI_TX_WATERMARK_REG);
 437 }
 438
 439 static void geni_spi_handle_rx(struct spi_geni_master *mas)
 440 {
 441         struct geni_se *se = &mas->se;
 442         u32 rx_fifo_status;
 443         unsigned int rx_bytes;
 444         unsigned int rx_last_byte_valid;
 445         u8 *rx_buf;
 446         unsigned int bytes_per_fifo_word = geni_byte_per_fifo_word(mas);
 447         unsigned int i = 0;
 448
 449         rx_fifo_status = readl(se->base + SE_GENI_RX_FIFO_STATUS);
 450         rx_bytes = (rx_fifo_status & RX_FIFO_WC_MSK) * bytes_per_fifo_word;
 451         if (rx_fifo_status & RX_LAST) {
 452                 rx_last_byte_valid = rx_fifo_status & RX_LAST_BYTE_VALID_MSK;
 453                 rx_last_byte_valid >>= RX_LAST_BYTE_VALID_SHFT;
 454                 if (rx_last_byte_valid && rx_last_byte_valid < 4)
 455                         rx_bytes -= bytes_per_fifo_word - rx_last_byte_valid;
 456         }
 457         if (mas->rx_rem_bytes < rx_bytes)
 458                 rx_bytes = mas->rx_rem_bytes;
 459
 460         rx_buf = mas->cur_xfer->rx_buf + mas->cur_xfer->len - mas->rx_rem_bytes;
 461         while (i < rx_bytes) {
 462                 u32 fifo_word = 0;
 463                 u8 *fifo_byte = (u8 *)&fifo_word;
 464                 unsigned int bytes_to_read;
 465                 unsigned int j;
 466
 467                 bytes_to_read = min(bytes_per_fifo_word, rx_bytes - i);
 468                 ioread32_rep(se->base + SE_GENI_RX_FIFOn, &fifo_word, 1);
 469                 for (j = 0; j < bytes_to_read; j++)
 470                         rx_buf[i++] = fifo_byte[j];
 471         }
 472         mas->rx_rem_bytes -= rx_bytes;
 473 }
 474
 475 static irqreturn_t geni_spi_isr(int irq, void *data)
 476 {
 477         struct spi_master *spi = data;
 478         struct spi_geni_master *mas = spi_master_get_devdata(spi);
 479         struct geni_se *se = &mas->se;
 480         u32 m_irq;
 481         unsigned long flags;
 482
 483         if (mas->cur_mcmd == CMD_NONE)
 484                 return IRQ_NONE;
 485
 486         spin_lock_irqsave(&mas->lock, flags);
 487         m_irq = readl(se->base + SE_GENI_M_IRQ_STATUS);
 488
 489         if ((m_irq & M_RX_FIFO_WATERMARK_EN) || (m_irq & M_RX_FIFO_LAST_EN))
 490                 geni_spi_handle_rx(mas);
 491
 492         if (m_irq & M_TX_FIFO_WATERMARK_EN)
 493                 geni_spi_handle_tx(mas);
 494
 495         if (m_irq & M_CMD_DONE_EN) {
 496                 if (mas->cur_mcmd == CMD_XFER)
 497                         spi_finalize_current_transfer(spi);
 498                 else if (mas->cur_mcmd == CMD_CS)
 499                         complete(&mas->xfer_done);
 500                 mas->cur_mcmd = CMD_NONE;
 501                 /*
 502                  * If this happens, then a CMD_DONE came before all the Tx
 503                  * buffer bytes were sent out. This is unusual, log this
 504                  * condition and disable the WM interrupt to prevent the
 505                  * system from stalling due an interrupt storm.
 506                  * If this happens when all Rx bytes haven't been received, log
 507                  * the condition.
 508                  * The only known time this can happen is if bits_per_word != 8
 509                  * and some registers that expect xfer lengths in num spi_words
 510                  * weren't written correctly.
 511                  */
 512                 if (mas->tx_rem_bytes) {
 513                         writel(0, se->base + SE_GENI_TX_WATERMARK_REG);
 514                         dev_err(mas->dev, "Premature done. tx_rem = %d bpw%d\n",
 515                                 mas->tx_rem_bytes, mas->cur_bits_per_word);
 516                 }
 517                 if (mas->rx_rem_bytes)
 518                         dev_err(mas->dev, "Premature done. rx_rem = %d bpw%d\n",
 519                                 mas->rx_rem_bytes, mas->cur_bits_per_word);
 520         }
 521
 522         if ((m_irq & M_CMD_CANCEL_EN) || (m_irq & M_CMD_ABORT_EN)) {
 523                 mas->cur_mcmd = CMD_NONE;
 524                 complete(&mas->xfer_done);
 525         }
 526
 527         writel(m_irq, se->base + SE_GENI_M_IRQ_CLEAR);
 528         spin_unlock_irqrestore(&mas->lock, flags);
 529         return IRQ_HANDLED;
 530 }
 531
 532 static int spi_geni_probe(struct platform_device *pdev)
 533 {
 534         int ret, irq;
 535         struct spi_master *spi;
 536         struct spi_geni_master *mas;
 537         void __iomem *base;
 538         struct clk *clk;
 539
 540         irq = platform_get_irq(pdev, 0);
 541         if (irq < 0)
 542                 return irq;
 543
 544         base = devm_platform_ioremap_resource(pdev, 0);
 545         if (IS_ERR(base))
 546                 return PTR_ERR(base);
 547
 548         clk = devm_clk_get(&pdev->dev, "se");
 549         if (IS_ERR(clk)) {
 550                 dev_err(&pdev->dev, "Err getting SE Core clk %ld\n",
 551                                                 PTR_ERR(clk));
 552                 return PTR_ERR(clk);
 553         }
 554
 555         spi = spi_alloc_master(&pdev->dev, sizeof(*mas));
 556         if (!spi)
 557                 return -ENOMEM;
 558
 559         platform_set_drvdata(pdev, spi);
 560         mas = spi_master_get_devdata(spi);
 561         mas->irq = irq;
 562         mas->dev = &pdev->dev;
 563         mas->se.dev = &pdev->dev;
 564         mas->se.wrapper = dev_get_drvdata(pdev->dev.parent);
 565         mas->se.base = base;
 566         mas->se.clk = clk;
 567
 568         spi->bus_num = -1;
 569         spi->dev.of_node = pdev->dev.of_node;
 570         spi->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP | SPI_CS_HIGH;
 571         spi->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
 572         spi->num_chipselect = 4;
 573         spi->max_speed_hz = 50000000;
 574         spi->prepare_message = spi_geni_prepare_message;
 575         spi->transfer_one = spi_geni_transfer_one;
 576         spi->auto_runtime_pm = true;
 577         spi->handle_err = handle_fifo_timeout;
 578         spi->set_cs = spi_geni_set_cs;
 579
 580         init_completion(&mas->xfer_done);
 581         spin_lock_init(&mas->lock);
 582         pm_runtime_enable(&pdev->dev);
 583
 584         ret = spi_geni_init(mas);
 585         if (ret)
 586                 goto spi_geni_probe_runtime_disable;
 587
 588         ret = request_irq(mas->irq, geni_spi_isr,
 589                         IRQF_TRIGGER_HIGH, "spi_geni", spi);
 590         if (ret)
 591                 goto spi_geni_probe_runtime_disable;
 592
 593         ret = spi_register_master(spi);
 594         if (ret)
 595                 goto spi_geni_probe_free_irq;
 596
 597         return 0;
 598 spi_geni_probe_free_irq:
 599         free_irq(mas->irq, spi);
 600 spi_geni_probe_runtime_disable:
 601         pm_runtime_disable(&pdev->dev);
 602         spi_master_put(spi);
 603         return ret;
 604 }
 605
 606 static int spi_geni_remove(struct platform_device *pdev)
 607 {
 608         struct spi_master *spi = platform_get_drvdata(pdev);
 609         struct spi_geni_master *mas = spi_master_get_devdata(spi);
 610
 611         /* Unregister _before_ disabling pm_runtime() so we stop transfers */
 612         spi_unregister_master(spi);
 613
 614         free_irq(mas->irq, spi);
 615         pm_runtime_disable(&pdev->dev);
 616         return 0;
 617 }
 618
 619 static int __maybe_unused spi_geni_runtime_suspend(struct device *dev)
 620 {
 621         struct spi_master *spi = dev_get_drvdata(dev);
 622         struct spi_geni_master *mas = spi_master_get_devdata(spi);
 623
 624         return geni_se_resources_off(&mas->se);
 625 }
 626
 627 static int __maybe_unused spi_geni_runtime_resume(struct device *dev)
 628 {
 629         struct spi_master *spi = dev_get_drvdata(dev);
 630         struct spi_geni_master *mas = spi_master_get_devdata(spi);
 631
 632         return geni_se_resources_on(&mas->se);
 633 }
 634
 635 static int __maybe_unused spi_geni_suspend(struct device *dev)
 636 {
 637         struct spi_master *spi = dev_get_drvdata(dev);
 638         int ret;
 639
 640         ret = spi_master_suspend(spi);
 641         if (ret)
 642                 return ret;
 643
 644         ret = pm_runtime_force_suspend(dev);
 645         if (ret)
 646                 spi_master_resume(spi);
 647
 648         return ret;
 649 }
 650
 651 static int __maybe_unused spi_geni_resume(struct device *dev)
 652 {
 653         struct spi_master *spi = dev_get_drvdata(dev);
 654         int ret;
 655
 656         ret = pm_runtime_force_resume(dev);
 657         if (ret)
 658                 return ret;
 659
 660         ret = spi_master_resume(spi);
 661         if (ret)
 662                 pm_runtime_force_suspend(dev);
 663
 664         return ret;
 665 }
 666
 667 static const struct dev_pm_ops spi_geni_pm_ops = {
 668         SET_RUNTIME_PM_OPS(spi_geni_runtime_suspend,
 669                                         spi_geni_runtime_resume, NULL)
 670         SET_SYSTEM_SLEEP_PM_OPS(spi_geni_suspend, spi_geni_resume)
 671 };
 672
 673 static const struct of_device_id spi_geni_dt_match[] = {
 674         { .compatible = "qcom,geni-spi" },
 675         {}
 676 };
 677 MODULE_DEVICE_TABLE(of, spi_geni_dt_match);
 678
 679 static struct platform_driver spi_geni_driver = {
 680         .probe  = spi_geni_probe,
 681         .remove = spi_geni_remove,
 682         .driver = {
 683                 .name = "geni_spi",
 684                 .pm = &spi_geni_pm_ops,
 685                 .of_match_table = spi_geni_dt_match,
 686         },
 687 };
 688 module_platform_driver(spi_geni_driver);
 689
 690 MODULE_DESCRIPTION("SPI driver for GENI based QUP cores");
 691 MODULE_LICENSE("GPL v2");