drivers/spi/spi-ti-qspi.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * TI QSPI driver
   4  *
   5  * Copyright (C) 2013 Texas Instruments Incorporated - https://www.ti.com
   6  * Author: Sourav Poddar <sourav.poddar@ti.com>
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/module.h>
  13 #include <linux/device.h>
  14 #include <linux/delay.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/dmaengine.h>
  17 #include <linux/omap-dma.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/err.h>
  20 #include <linux/clk.h>
  21 #include <linux/io.h>
  22 #include <linux/slab.h>
  23 #include <linux/pm_runtime.h>
  24 #include <linux/of.h>
  25 #include <linux/of_device.h>
  26 #include <linux/pinctrl/consumer.h>
  27 #include <linux/mfd/syscon.h>
  28 #include <linux/regmap.h>
  29 #include <linux/sizes.h>
  30
  31 #include <linux/spi/spi.h>
  32 #include <linux/spi/spi-mem.h>
  33
  34 struct ti_qspi_regs {
  35         u32 clkctrl;
  36 };
  37
  38 struct ti_qspi {
  39         struct completion       transfer_complete;
  40
  41         /* list synchronization */
  42         struct mutex            list_lock;
  43
  44         struct spi_master       *master;
  45         void __iomem            *base;
  46         void __iomem            *mmap_base;
  47         size_t                  mmap_size;
  48         struct regmap           *ctrl_base;
  49         unsigned int            ctrl_reg;
  50         struct clk              *fclk;
  51         struct device           *dev;
  52
  53         struct ti_qspi_regs     ctx_reg;
  54
  55         dma_addr_t              mmap_phys_base;
  56         dma_addr_t              rx_bb_dma_addr;
  57         void                    *rx_bb_addr;
  58         struct dma_chan         *rx_chan;
  59
  60         u32 spi_max_frequency;
  61         u32 cmd;
  62         u32 dc;
  63
  64         bool mmap_enabled;
  65         int current_cs;
  66 };
  67
  68 #define QSPI_PID                        (0x0)
  69 #define QSPI_SYSCONFIG                  (0x10)
  70 #define QSPI_SPI_CLOCK_CNTRL_REG        (0x40)
  71 #define QSPI_SPI_DC_REG                 (0x44)
  72 #define QSPI_SPI_CMD_REG                (0x48)
  73 #define QSPI_SPI_STATUS_REG             (0x4c)
  74 #define QSPI_SPI_DATA_REG               (0x50)
  75 #define QSPI_SPI_SETUP_REG(n)           ((0x54 + 4 * n))
  76 #define QSPI_SPI_SWITCH_REG             (0x64)
  77 #define QSPI_SPI_DATA_REG_1             (0x68)
  78 #define QSPI_SPI_DATA_REG_2             (0x6c)
  79 #define QSPI_SPI_DATA_REG_3             (0x70)
  80
  81 #define QSPI_COMPLETION_TIMEOUT         msecs_to_jiffies(2000)
  82
  83 /* Clock Control */
  84 #define QSPI_CLK_EN                     (1 << 31)
  85 #define QSPI_CLK_DIV_MAX                0xffff
  86
  87 /* Command */
  88 #define QSPI_EN_CS(n)                   (n << 28)
  89 #define QSPI_WLEN(n)                    ((n - 1) << 19)
  90 #define QSPI_3_PIN                      (1 << 18)
  91 #define QSPI_RD_SNGL                    (1 << 16)
  92 #define QSPI_WR_SNGL                    (2 << 16)
  93 #define QSPI_RD_DUAL                    (3 << 16)
  94 #define QSPI_RD_QUAD                    (7 << 16)
  95 #define QSPI_INVAL                      (4 << 16)
  96 #define QSPI_FLEN(n)                    ((n - 1) << 0)
  97 #define QSPI_WLEN_MAX_BITS              128
  98 #define QSPI_WLEN_MAX_BYTES             16
  99 #define QSPI_WLEN_MASK                  QSPI_WLEN(QSPI_WLEN_MAX_BITS)
 100
 101 /* STATUS REGISTER */
 102 #define BUSY                            0x01
 103 #define WC                              0x02
 104
 105 /* Device Control */
 106 #define QSPI_DD(m, n)                   (m << (3 + n * 8))
 107 #define QSPI_CKPHA(n)                   (1 << (2 + n * 8))
 108 #define QSPI_CSPOL(n)                   (1 << (1 + n * 8))
 109 #define QSPI_CKPOL(n)                   (1 << (n * 8))
 110
 111 #define QSPI_FRAME                      4096
 112
 113 #define QSPI_AUTOSUSPEND_TIMEOUT         2000
 114
 115 #define MEM_CS_EN(n)                    ((n + 1) << 8)
 116 #define MEM_CS_MASK                     (7 << 8)
 117
 118 #define MM_SWITCH                       0x1
 119
 120 #define QSPI_SETUP_RD_NORMAL            (0x0 << 12)
 121 #define QSPI_SETUP_RD_DUAL              (0x1 << 12)
 122 #define QSPI_SETUP_RD_QUAD              (0x3 << 12)
 123 #define QSPI_SETUP_ADDR_SHIFT           8
 124 #define QSPI_SETUP_DUMMY_SHIFT          10
 125
 126 #define QSPI_DMA_BUFFER_SIZE            SZ_64K
 127
 128 static inline unsigned long ti_qspi_read(struct ti_qspi *qspi,
 129                 unsigned long reg)
 130 {
 131         return readl(qspi->base + reg);
 132 }
 133
 134 static inline void ti_qspi_write(struct ti_qspi *qspi,
 135                 unsigned long val, unsigned long reg)
 136 {
 137         writel(val, qspi->base + reg);
 138 }
 139
 140 static int ti_qspi_setup(struct spi_device *spi)
 141 {
 142         struct ti_qspi  *qspi = spi_master_get_devdata(spi->master);
 143         struct ti_qspi_regs *ctx_reg = &qspi->ctx_reg;
 144         int clk_div = 0, ret;
 145         u32 clk_ctrl_reg, clk_rate, clk_mask;
 146
 147         if (spi->master->busy) {
 148                 dev_dbg(qspi->dev, "master busy doing other transfers\n");
 149                 return -EBUSY;
 150         }
 151
 152         if (!qspi->spi_max_frequency) {
 153                 dev_err(qspi->dev, "spi max frequency not defined\n");
 154                 return -EINVAL;
 155         }
 156
 157         clk_rate = clk_get_rate(qspi->fclk);
 158
 159         clk_div = DIV_ROUND_UP(clk_rate, qspi->spi_max_frequency) - 1;
 160
 161         if (clk_div < 0) {
 162                 dev_dbg(qspi->dev, "clock divider < 0, using /1 divider\n");
 163                 return -EINVAL;
 164         }
 165
 166         if (clk_div > QSPI_CLK_DIV_MAX) {
 167                 dev_dbg(qspi->dev, "clock divider >%d , using /%d divider\n",
 168                                 QSPI_CLK_DIV_MAX, QSPI_CLK_DIV_MAX + 1);
 169                 return -EINVAL;
 170         }
 171
 172         dev_dbg(qspi->dev, "hz: %d, clock divider %d\n",
 173                         qspi->spi_max_frequency, clk_div);
 174
 175         ret = pm_runtime_resume_and_get(qspi->dev);
 176         if (ret < 0) {
 177                 dev_err(qspi->dev, "pm_runtime_get_sync() failed\n");
 178                 return ret;
 179         }
 180
 181         clk_ctrl_reg = ti_qspi_read(qspi, QSPI_SPI_CLOCK_CNTRL_REG);
 182
 183         clk_ctrl_reg &= ~QSPI_CLK_EN;
 184
 185         /* disable SCLK */
 186         ti_qspi_write(qspi, clk_ctrl_reg, QSPI_SPI_CLOCK_CNTRL_REG);
 187
 188         /* enable SCLK */
 189         clk_mask = QSPI_CLK_EN | clk_div;
 190         ti_qspi_write(qspi, clk_mask, QSPI_SPI_CLOCK_CNTRL_REG);
 191         ctx_reg->clkctrl = clk_mask;
 192
 193         pm_runtime_mark_last_busy(qspi->dev);
 194         ret = pm_runtime_put_autosuspend(qspi->dev);
 195         if (ret < 0) {
 196                 dev_err(qspi->dev, "pm_runtime_put_autosuspend() failed\n");
 197                 return ret;
 198         }
 199
 200         return 0;
 201 }
 202
 203 static void ti_qspi_restore_ctx(struct ti_qspi *qspi)
 204 {
 205         struct ti_qspi_regs *ctx_reg = &qspi->ctx_reg;
 206
 207         ti_qspi_write(qspi, ctx_reg->clkctrl, QSPI_SPI_CLOCK_CNTRL_REG);
 208 }
 209
 210 static inline u32 qspi_is_busy(struct ti_qspi *qspi)
 211 {
 212         u32 stat;
 213         unsigned long timeout = jiffies + QSPI_COMPLETION_TIMEOUT;
 214
 215         stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG);
 216         while ((stat & BUSY) && time_after(timeout, jiffies)) {
 217                 cpu_relax();
 218                 stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG);
 219         }
 220
 221         WARN(stat & BUSY, "qspi busy\n");
 222         return stat & BUSY;
 223 }
 224
 225 static inline int ti_qspi_poll_wc(struct ti_qspi *qspi)
 226 {
 227         u32 stat;
 228         unsigned long timeout = jiffies + QSPI_COMPLETION_TIMEOUT;
 229
 230         do {
 231                 stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG);
 232                 if (stat & WC)
 233                         return 0;
 234                 cpu_relax();
 235         } while (time_after(timeout, jiffies));
 236
 237         stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG);
 238         if (stat & WC)
 239                 return 0;
 240         return  -ETIMEDOUT;
 241 }
 242
 243 static int qspi_write_msg(struct ti_qspi *qspi, struct spi_transfer *t,
 244                           int count)
 245 {
 246         int wlen, xfer_len;
 247         unsigned int cmd;
 248         const u8 *txbuf;
 249         u32 data;
 250
 251         txbuf = t->tx_buf;
 252         cmd = qspi->cmd | QSPI_WR_SNGL;
 253         wlen = t->bits_per_word >> 3;   /* in bytes */
 254         xfer_len = wlen;
 255
 256         while (count) {
 257                 if (qspi_is_busy(qspi))
 258                         return -EBUSY;
 259
 260                 switch (wlen) {
 261                 case 1:
 262                         dev_dbg(qspi->dev, "tx cmd %08x dc %08x data %02x\n",
 263                                         cmd, qspi->dc, *txbuf);
 264                         if (count >= QSPI_WLEN_MAX_BYTES) {
 265                                 u32 *txp = (u32 *)txbuf;
 266
 267                                 data = cpu_to_be32(*txp++);
 268                                 writel(data, qspi->base +
 269                                        QSPI_SPI_DATA_REG_3);
 270                                 data = cpu_to_be32(*txp++);
 271                                 writel(data, qspi->base +
 272                                        QSPI_SPI_DATA_REG_2);
 273                                 data = cpu_to_be32(*txp++);
 274                                 writel(data, qspi->base +
 275                                        QSPI_SPI_DATA_REG_1);
 276                                 data = cpu_to_be32(*txp++);
 277                                 writel(data, qspi->base +
 278                                        QSPI_SPI_DATA_REG);
 279                                 xfer_len = QSPI_WLEN_MAX_BYTES;
 280                                 cmd |= QSPI_WLEN(QSPI_WLEN_MAX_BITS);
 281                         } else {
 282                                 writeb(*txbuf, qspi->base + QSPI_SPI_DATA_REG);
 283                                 cmd = qspi->cmd | QSPI_WR_SNGL;
 284                                 xfer_len = wlen;
 285                                 cmd |= QSPI_WLEN(wlen);
 286                         }
 287                         break;
 288                 case 2:
 289                         dev_dbg(qspi->dev, "tx cmd %08x dc %08x data %04x\n",
 290                                         cmd, qspi->dc, *txbuf);
 291                         writew(*((u16 *)txbuf), qspi->base + QSPI_SPI_DATA_REG);
 292                         break;
 293                 case 4:
 294                         dev_dbg(qspi->dev, "tx cmd %08x dc %08x data %08x\n",
 295                                         cmd, qspi->dc, *txbuf);
 296                         writel(*((u32 *)txbuf), qspi->base + QSPI_SPI_DATA_REG);
 297                         break;
 298                 }
 299
 300                 ti_qspi_write(qspi, cmd, QSPI_SPI_CMD_REG);
 301                 if (ti_qspi_poll_wc(qspi)) {
 302                         dev_err(qspi->dev, "write timed out\n");
 303                         return -ETIMEDOUT;
 304                 }
 305                 txbuf += xfer_len;
 306                 count -= xfer_len;
 307         }
 308
 309         return 0;
 310 }
 311
 312 static int qspi_read_msg(struct ti_qspi *qspi, struct spi_transfer *t,
 313                          int count)
 314 {
 315         int wlen;
 316         unsigned int cmd;
 317         u32 rx;
 318         u8 rxlen, rx_wlen;
 319         u8 *rxbuf;
 320
 321         rxbuf = t->rx_buf;
 322         cmd = qspi->cmd;
 323         switch (t->rx_nbits) {
 324         case SPI_NBITS_DUAL:
 325                 cmd |= QSPI_RD_DUAL;
 326                 break;
 327         case SPI_NBITS_QUAD:
 328                 cmd |= QSPI_RD_QUAD;
 329                 break;
 330         default:
 331                 cmd |= QSPI_RD_SNGL;
 332                 break;
 333         }
 334         wlen = t->bits_per_word >> 3;   /* in bytes */
 335         rx_wlen = wlen;
 336
 337         while (count) {
 338                 dev_dbg(qspi->dev, "rx cmd %08x dc %08x\n", cmd, qspi->dc);
 339                 if (qspi_is_busy(qspi))
 340                         return -EBUSY;
 341
 342                 switch (wlen) {
 343                 case 1:
 344                         /*
 345                          * Optimize the 8-bit words transfers, as used by
 346                          * the SPI flash devices.
 347                          */
 348                         if (count >= QSPI_WLEN_MAX_BYTES) {
 349                                 rxlen = QSPI_WLEN_MAX_BYTES;
 350                         } else {
 351                                 rxlen = min(count, 4);
 352                         }
 353                         rx_wlen = rxlen << 3;
 354                         cmd &= ~QSPI_WLEN_MASK;
 355                         cmd |= QSPI_WLEN(rx_wlen);
 356                         break;
 357                 default:
 358                         rxlen = wlen;
 359                         break;
 360                 }
 361
 362                 ti_qspi_write(qspi, cmd, QSPI_SPI_CMD_REG);
 363                 if (ti_qspi_poll_wc(qspi)) {
 364                         dev_err(qspi->dev, "read timed out\n");
 365                         return -ETIMEDOUT;
 366                 }
 367
 368                 switch (wlen) {
 369                 case 1:
 370                         /*
 371                          * Optimize the 8-bit words transfers, as used by
 372                          * the SPI flash devices.
 373                          */
 374                         if (count >= QSPI_WLEN_MAX_BYTES) {
 375                                 u32 *rxp = (u32 *) rxbuf;
 376                                 rx = readl(qspi->base + QSPI_SPI_DATA_REG_3);
 377                                 *rxp++ = be32_to_cpu(rx);
 378                                 rx = readl(qspi->base + QSPI_SPI_DATA_REG_2);
 379                                 *rxp++ = be32_to_cpu(rx);
 380                                 rx = readl(qspi->base + QSPI_SPI_DATA_REG_1);
 381                                 *rxp++ = be32_to_cpu(rx);
 382                                 rx = readl(qspi->base + QSPI_SPI_DATA_REG);
 383                                 *rxp++ = be32_to_cpu(rx);
 384                         } else {
 385                                 u8 *rxp = rxbuf;
 386                                 rx = readl(qspi->base + QSPI_SPI_DATA_REG);
 387                                 if (rx_wlen >= 8)
 388                                         *rxp++ = rx >> (rx_wlen - 8);
 389                                 if (rx_wlen >= 16)
 390                                         *rxp++ = rx >> (rx_wlen - 16);
 391                                 if (rx_wlen >= 24)
 392                                         *rxp++ = rx >> (rx_wlen - 24);
 393                                 if (rx_wlen >= 32)
 394                                         *rxp++ = rx;
 395                         }
 396                         break;
 397                 case 2:
 398                         *((u16 *)rxbuf) = readw(qspi->base + QSPI_SPI_DATA_REG);
 399                         break;
 400                 case 4:
 401                         *((u32 *)rxbuf) = readl(qspi->base + QSPI_SPI_DATA_REG);
 402                         break;
 403                 }
 404                 rxbuf += rxlen;
 405                 count -= rxlen;
 406         }
 407
 408         return 0;
 409 }
 410
 411 static int qspi_transfer_msg(struct ti_qspi *qspi, struct spi_transfer *t,
 412                              int count)
 413 {
 414         int ret;
 415
 416         if (t->tx_buf) {
 417                 ret = qspi_write_msg(qspi, t, count);
 418                 if (ret) {
 419                         dev_dbg(qspi->dev, "Error while writing\n");
 420                         return ret;
 421                 }
 422         }
 423
 424         if (t->rx_buf) {
 425                 ret = qspi_read_msg(qspi, t, count);
 426                 if (ret) {
 427                         dev_dbg(qspi->dev, "Error while reading\n");
 428                         return ret;
 429                 }
 430         }
 431
 432         return 0;
 433 }
 434
 435 static void ti_qspi_dma_callback(void *param)
 436 {
 437         struct ti_qspi *qspi = param;
 438
 439         complete(&qspi->transfer_complete);
 440 }
 441
 442 static int ti_qspi_dma_xfer(struct ti_qspi *qspi, dma_addr_t dma_dst,
 443                             dma_addr_t dma_src, size_t len)
 444 {
 445         struct dma_chan *chan = qspi->rx_chan;
 446         dma_cookie_t cookie;
 447         enum dma_ctrl_flags flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
 448         struct dma_async_tx_descriptor *tx;
 449         int ret;
 450         unsigned long time_left;
 451
 452         tx = dmaengine_prep_dma_memcpy(chan, dma_dst, dma_src, len, flags);
 453         if (!tx) {
 454                 dev_err(qspi->dev, "device_prep_dma_memcpy error\n");
 455                 return -EIO;
 456         }
 457
 458         tx->callback = ti_qspi_dma_callback;
 459         tx->callback_param = qspi;
 460         cookie = tx->tx_submit(tx);
 461         reinit_completion(&qspi->transfer_complete);
 462
 463         ret = dma_submit_error(cookie);
 464         if (ret) {
 465                 dev_err(qspi->dev, "dma_submit_error %d\n", cookie);
 466                 return -EIO;
 467         }
 468
 469         dma_async_issue_pending(chan);
 470         time_left = wait_for_completion_timeout(&qspi->transfer_complete,
 471                                           msecs_to_jiffies(len));
 472         if (time_left == 0) {
 473                 dmaengine_terminate_sync(chan);
 474                 dev_err(qspi->dev, "DMA wait_for_completion_timeout\n");
 475                 return -ETIMEDOUT;
 476         }
 477
 478         return 0;
 479 }
 480
 481 static int ti_qspi_dma_bounce_buffer(struct ti_qspi *qspi, loff_t offs,
 482                                      void *to, size_t readsize)
 483 {
 484         dma_addr_t dma_src = qspi->mmap_phys_base + offs;
 485         int ret = 0;
 486
 487         /*
 488          * Use bounce buffer as FS like jffs2, ubifs may pass
 489          * buffers that does not belong to kernel lowmem region.
 490          */
 491         while (readsize != 0) {
 492                 size_t xfer_len = min_t(size_t, QSPI_DMA_BUFFER_SIZE,
 493                                         readsize);
 494
 495                 ret = ti_qspi_dma_xfer(qspi, qspi->rx_bb_dma_addr,
 496                                        dma_src, xfer_len);
 497                 if (ret != 0)
 498                         return ret;
 499                 memcpy(to, qspi->rx_bb_addr, xfer_len);
 500                 readsize -= xfer_len;
 501                 dma_src += xfer_len;
 502                 to += xfer_len;
 503         }
 504
 505         return ret;
 506 }
 507
 508 static int ti_qspi_dma_xfer_sg(struct ti_qspi *qspi, struct sg_table rx_sg,
 509                                loff_t from)
 510 {
 511         struct scatterlist *sg;
 512         dma_addr_t dma_src = qspi->mmap_phys_base + from;
 513         dma_addr_t dma_dst;
 514         int i, len, ret;
 515
 516         for_each_sg(rx_sg.sgl, sg, rx_sg.nents, i) {
 517                 dma_dst = sg_dma_address(sg);
 518                 len = sg_dma_len(sg);
 519                 ret = ti_qspi_dma_xfer(qspi, dma_dst, dma_src, len);
 520                 if (ret)
 521                         return ret;
 522                 dma_src += len;
 523         }
 524
 525         return 0;
 526 }
 527
 528 static void ti_qspi_enable_memory_map(struct spi_device *spi)
 529 {
 530         struct ti_qspi  *qspi = spi_master_get_devdata(spi->master);
 531
 532         ti_qspi_write(qspi, MM_SWITCH, QSPI_SPI_SWITCH_REG);
 533         if (qspi->ctrl_base) {
 534                 regmap_update_bits(qspi->ctrl_base, qspi->ctrl_reg,
 535                                    MEM_CS_MASK,
 536                                    MEM_CS_EN(spi->chip_select));
 537         }
 538         qspi->mmap_enabled = true;
 539         qspi->current_cs = spi->chip_select;
 540 }
 541
 542 static void ti_qspi_disable_memory_map(struct spi_device *spi)
 543 {
 544         struct ti_qspi  *qspi = spi_master_get_devdata(spi->master);
 545
 546         ti_qspi_write(qspi, 0, QSPI_SPI_SWITCH_REG);
 547         if (qspi->ctrl_base)
 548                 regmap_update_bits(qspi->ctrl_base, qspi->ctrl_reg,
 549                                    MEM_CS_MASK, 0);
 550         qspi->mmap_enabled = false;
 551         qspi->current_cs = -1;
 552 }
 553
 554 static void ti_qspi_setup_mmap_read(struct spi_device *spi, u8 opcode,
 555                                     u8 data_nbits, u8 addr_width,
 556                                     u8 dummy_bytes)
 557 {
 558         struct ti_qspi  *qspi = spi_master_get_devdata(spi->master);
 559         u32 memval = opcode;
 560
 561         switch (data_nbits) {
 562         case SPI_NBITS_QUAD:
 563                 memval |= QSPI_SETUP_RD_QUAD;
 564                 break;
 565         case SPI_NBITS_DUAL:
 566                 memval |= QSPI_SETUP_RD_DUAL;
 567                 break;
 568         default:
 569                 memval |= QSPI_SETUP_RD_NORMAL;
 570                 break;
 571         }
 572         memval |= ((addr_width - 1) << QSPI_SETUP_ADDR_SHIFT |
 573                    dummy_bytes << QSPI_SETUP_DUMMY_SHIFT);
 574         ti_qspi_write(qspi, memval,
 575                       QSPI_SPI_SETUP_REG(spi->chip_select));
 576 }
 577
 578 static int ti_qspi_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op)
 579 {
 580         struct ti_qspi *qspi = spi_controller_get_devdata(mem->spi->master);
 581         size_t max_len;
 582
 583         if (op->data.dir == SPI_MEM_DATA_IN) {
 584                 if (op->addr.val < qspi->mmap_size) {
 585                         /* Limit MMIO to the mmaped region */
 586                         if (op->addr.val + op->data.nbytes > qspi->mmap_size) {
 587                                 max_len = qspi->mmap_size - op->addr.val;
 588                                 op->data.nbytes = min((size_t) op->data.nbytes,
 589                                                       max_len);
 590                         }
 591                 } else {
 592                         /*
 593                          * Use fallback mode (SW generated transfers) above the
 594                          * mmaped region.
 595                          * Adjust size to comply with the QSPI max frame length.
 596                          */
 597                         max_len = QSPI_FRAME;
 598                         max_len -= 1 + op->addr.nbytes + op->dummy.nbytes;
 599                         op->data.nbytes = min((size_t) op->data.nbytes,
 600                                               max_len);
 601                 }
 602         }
 603
 604         return 0;
 605 }
 606
 607 static int ti_qspi_exec_mem_op(struct spi_mem *mem,
 608                                const struct spi_mem_op *op)
 609 {
 610         struct ti_qspi *qspi = spi_master_get_devdata(mem->spi->master);
 611         u32 from = 0;
 612         int ret = 0;
 613
 614         /* Only optimize read path. */
 615         if (!op->data.nbytes || op->data.dir != SPI_MEM_DATA_IN ||
 616             !op->addr.nbytes || op->addr.nbytes > 4)
 617                 return -ENOTSUPP;
 618
 619         /* Address exceeds MMIO window size, fall back to regular mode. */
 620         from = op->addr.val;
 621         if (from + op->data.nbytes > qspi->mmap_size)
 622                 return -ENOTSUPP;
 623
 624         mutex_lock(&qspi->list_lock);
 625
 626         if (!qspi->mmap_enabled || qspi->current_cs != mem->spi->chip_select)
 627                 ti_qspi_enable_memory_map(mem->spi);
 628         ti_qspi_setup_mmap_read(mem->spi, op->cmd.opcode, op->data.buswidth,
 629                                 op->addr.nbytes, op->dummy.nbytes);
 630
 631         if (qspi->rx_chan) {
 632                 struct sg_table sgt;
 633
 634                 if (virt_addr_valid(op->data.buf.in) &&
 635                     !spi_controller_dma_map_mem_op_data(mem->spi->master, op,
 636                                                         &sgt)) {
 637                         ret = ti_qspi_dma_xfer_sg(qspi, sgt, from);
 638                         spi_controller_dma_unmap_mem_op_data(mem->spi->master,
 639                                                              op, &sgt);
 640                 } else {
 641                         ret = ti_qspi_dma_bounce_buffer(qspi, from,
 642                                                         op->data.buf.in,
 643                                                         op->data.nbytes);
 644                 }
 645         } else {
 646                 memcpy_fromio(op->data.buf.in, qspi->mmap_base + from,
 647                               op->data.nbytes);
 648         }
 649
 650         mutex_unlock(&qspi->list_lock);
 651
 652         return ret;
 653 }
 654
 655 static const struct spi_controller_mem_ops ti_qspi_mem_ops = {
 656         .exec_op = ti_qspi_exec_mem_op,
 657         .adjust_op_size = ti_qspi_adjust_op_size,
 658 };
 659
 660 static int ti_qspi_start_transfer_one(struct spi_master *master,
 661                 struct spi_message *m)
 662 {
 663         struct ti_qspi *qspi = spi_master_get_devdata(master);
 664         struct spi_device *spi = m->spi;
 665         struct spi_transfer *t;
 666         int status = 0, ret;
 667         unsigned int frame_len_words, transfer_len_words;
 668         int wlen;
 669
 670         /* setup device control reg */
 671         qspi->dc = 0;
 672
 673         if (spi->mode & SPI_CPHA)
 674                 qspi->dc |= QSPI_CKPHA(spi->chip_select);
 675         if (spi->mode & SPI_CPOL)
 676                 qspi->dc |= QSPI_CKPOL(spi->chip_select);
 677         if (spi->mode & SPI_CS_HIGH)
 678                 qspi->dc |= QSPI_CSPOL(spi->chip_select);
 679
 680         frame_len_words = 0;
 681         list_for_each_entry(t, &m->transfers, transfer_list)
 682                 frame_len_words += t->len / (t->bits_per_word >> 3);
 683         frame_len_words = min_t(unsigned int, frame_len_words, QSPI_FRAME);
 684
 685         /* setup command reg */
 686         qspi->cmd = 0;
 687         qspi->cmd |= QSPI_EN_CS(spi->chip_select);
 688         qspi->cmd |= QSPI_FLEN(frame_len_words);
 689
 690         ti_qspi_write(qspi, qspi->dc, QSPI_SPI_DC_REG);
 691
 692         mutex_lock(&qspi->list_lock);
 693
 694         if (qspi->mmap_enabled)
 695                 ti_qspi_disable_memory_map(spi);
 696
 697         list_for_each_entry(t, &m->transfers, transfer_list) {
 698                 qspi->cmd = ((qspi->cmd & ~QSPI_WLEN_MASK) |
 699                              QSPI_WLEN(t->bits_per_word));
 700
 701                 wlen = t->bits_per_word >> 3;
 702                 transfer_len_words = min(t->len / wlen, frame_len_words);
 703
 704                 ret = qspi_transfer_msg(qspi, t, transfer_len_words * wlen);
 705                 if (ret) {
 706                         dev_dbg(qspi->dev, "transfer message failed\n");
 707                         mutex_unlock(&qspi->list_lock);
 708                         return -EINVAL;
 709                 }
 710
 711                 m->actual_length += transfer_len_words * wlen;
 712                 frame_len_words -= transfer_len_words;
 713                 if (frame_len_words == 0)
 714                         break;
 715         }
 716
 717         mutex_unlock(&qspi->list_lock);
 718
 719         ti_qspi_write(qspi, qspi->cmd | QSPI_INVAL, QSPI_SPI_CMD_REG);
 720         m->status = status;
 721         spi_finalize_current_message(master);
 722
 723         return status;
 724 }
 725
 726 static int ti_qspi_runtime_resume(struct device *dev)
 727 {
 728         struct ti_qspi      *qspi;
 729
 730         qspi = dev_get_drvdata(dev);
 731         ti_qspi_restore_ctx(qspi);
 732
 733         return 0;
 734 }
 735
 736 static void ti_qspi_dma_cleanup(struct ti_qspi *qspi)
 737 {
 738         if (qspi->rx_bb_addr)
 739                 dma_free_coherent(qspi->dev, QSPI_DMA_BUFFER_SIZE,
 740                                   qspi->rx_bb_addr,
 741                                   qspi->rx_bb_dma_addr);
 742
 743         if (qspi->rx_chan)
 744                 dma_release_channel(qspi->rx_chan);
 745 }
 746
 747 static const struct of_device_id ti_qspi_match[] = {
 748         {.compatible = "ti,dra7xxx-qspi" },
 749         {.compatible = "ti,am4372-qspi" },
 750         {},
 751 };
 752 MODULE_DEVICE_TABLE(of, ti_qspi_match);
 753
 754 static int ti_qspi_probe(struct platform_device *pdev)
 755 {
 756         struct  ti_qspi *qspi;
 757         struct spi_master *master;
 758         struct resource         *r, *res_mmap;
 759         struct device_node *np = pdev->dev.of_node;
 760         u32 max_freq;
 761         int ret = 0, num_cs, irq;
 762         dma_cap_mask_t mask;
 763
 764         master = spi_alloc_master(&pdev->dev, sizeof(*qspi));
 765         if (!master)
 766                 return -ENOMEM;
 767
 768         master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD;
 769
 770         master->flags = SPI_MASTER_HALF_DUPLEX;
 771         master->setup = ti_qspi_setup;
 772         master->auto_runtime_pm = true;
 773         master->transfer_one_message = ti_qspi_start_transfer_one;
 774         master->dev.of_node = pdev->dev.of_node;
 775         master->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(16) |
 776                                      SPI_BPW_MASK(8);
 777         master->mem_ops = &ti_qspi_mem_ops;
 778
 779         if (!of_property_read_u32(np, "num-cs", &num_cs))
 780                 master->num_chipselect = num_cs;
 781
 782         qspi = spi_master_get_devdata(master);
 783         qspi->master = master;
 784         qspi->dev = &pdev->dev;
 785         platform_set_drvdata(pdev, qspi);
 786
 787         r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qspi_base");
 788         if (r == NULL) {
 789                 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 790                 if (r == NULL) {
 791                         dev_err(&pdev->dev, "missing platform data\n");
 792                         ret = -ENODEV;
 793                         goto free_master;
 794                 }
 795         }
 796
 797         res_mmap = platform_get_resource_byname(pdev,
 798                         IORESOURCE_MEM, "qspi_mmap");
 799         if (res_mmap == NULL) {
 800                 res_mmap = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 801                 if (res_mmap == NULL) {
 802                         dev_err(&pdev->dev,
 803                                 "memory mapped resource not required\n");
 804                 }
 805         }
 806
 807         if (res_mmap)
 808                 qspi->mmap_size = resource_size(res_mmap);
 809
 810         irq = platform_get_irq(pdev, 0);
 811         if (irq < 0) {
 812                 ret = irq;
 813                 goto free_master;
 814         }
 815
 816         mutex_init(&qspi->list_lock);
 817
 818         qspi->base = devm_ioremap_resource(&pdev->dev, r);
 819         if (IS_ERR(qspi->base)) {
 820                 ret = PTR_ERR(qspi->base);
 821                 goto free_master;
 822         }
 823
 824
 825         if (of_property_read_bool(np, "syscon-chipselects")) {
 826                 qspi->ctrl_base =
 827                 syscon_regmap_lookup_by_phandle(np,
 828                                                 "syscon-chipselects");
 829                 if (IS_ERR(qspi->ctrl_base)) {
 830                         ret = PTR_ERR(qspi->ctrl_base);
 831                         goto free_master;
 832                 }
 833                 ret = of_property_read_u32_index(np,
 834                                                  "syscon-chipselects",
 835                                                  1, &qspi->ctrl_reg);
 836                 if (ret) {
 837                         dev_err(&pdev->dev,
 838                                 "couldn't get ctrl_mod reg index\n");
 839                         goto free_master;
 840                 }
 841         }
 842
 843         qspi->fclk = devm_clk_get(&pdev->dev, "fck");
 844         if (IS_ERR(qspi->fclk)) {
 845                 ret = PTR_ERR(qspi->fclk);
 846                 dev_err(&pdev->dev, "could not get clk: %d\n", ret);
 847         }
 848
 849         pm_runtime_use_autosuspend(&pdev->dev);
 850         pm_runtime_set_autosuspend_delay(&pdev->dev, QSPI_AUTOSUSPEND_TIMEOUT);
 851         pm_runtime_enable(&pdev->dev);
 852
 853         if (!of_property_read_u32(np, "spi-max-frequency", &max_freq))
 854                 qspi->spi_max_frequency = max_freq;
 855
 856         dma_cap_zero(mask);
 857         dma_cap_set(DMA_MEMCPY, mask);
 858
 859         qspi->rx_chan = dma_request_chan_by_mask(&mask);
 860         if (IS_ERR(qspi->rx_chan)) {
 861                 dev_err(qspi->dev,
 862                         "No Rx DMA available, trying mmap mode\n");
 863                 qspi->rx_chan = NULL;
 864                 ret = 0;
 865                 goto no_dma;
 866         }
 867         qspi->rx_bb_addr = dma_alloc_coherent(qspi->dev,
 868                                               QSPI_DMA_BUFFER_SIZE,
 869                                               &qspi->rx_bb_dma_addr,
 870                                               GFP_KERNEL | GFP_DMA);
 871         if (!qspi->rx_bb_addr) {
 872                 dev_err(qspi->dev,
 873                         "dma_alloc_coherent failed, using PIO mode\n");
 874                 dma_release_channel(qspi->rx_chan);
 875                 goto no_dma;
 876         }
 877         master->dma_rx = qspi->rx_chan;
 878         init_completion(&qspi->transfer_complete);
 879         if (res_mmap)
 880                 qspi->mmap_phys_base = (dma_addr_t)res_mmap->start;
 881
 882 no_dma:
 883         if (!qspi->rx_chan && res_mmap) {
 884                 qspi->mmap_base = devm_ioremap_resource(&pdev->dev, res_mmap);
 885                 if (IS_ERR(qspi->mmap_base)) {
 886                         dev_info(&pdev->dev,
 887                                  "mmap failed with error %ld using PIO mode\n",
 888                                  PTR_ERR(qspi->mmap_base));
 889                         qspi->mmap_base = NULL;
 890                         master->mem_ops = NULL;
 891                 }
 892         }
 893         qspi->mmap_enabled = false;
 894         qspi->current_cs = -1;
 895
 896         ret = devm_spi_register_master(&pdev->dev, master);
 897         if (!ret)
 898                 return 0;
 899
 900         ti_qspi_dma_cleanup(qspi);
 901
 902         pm_runtime_disable(&pdev->dev);
 903 free_master:
 904         spi_master_put(master);
 905         return ret;
 906 }
 907
 908 static int ti_qspi_remove(struct platform_device *pdev)
 909 {
 910         struct ti_qspi *qspi = platform_get_drvdata(pdev);
 911         int rc;
 912
 913         rc = spi_master_suspend(qspi->master);
 914         if (rc)
 915                 return rc;
 916
 917         pm_runtime_put_sync(&pdev->dev);
 918         pm_runtime_disable(&pdev->dev);
 919
 920         ti_qspi_dma_cleanup(qspi);
 921
 922         return 0;
 923 }
 924
 925 static const struct dev_pm_ops ti_qspi_pm_ops = {
 926         .runtime_resume = ti_qspi_runtime_resume,
 927 };
 928
 929 static struct platform_driver ti_qspi_driver = {
 930         .probe  = ti_qspi_probe,
 931         .remove = ti_qspi_remove,
 932         .driver = {
 933                 .name   = "ti-qspi",
 934                 .pm =   &ti_qspi_pm_ops,
 935                 .of_match_table = ti_qspi_match,
 936         }
 937 };
 938
 939 module_platform_driver(ti_qspi_driver);
 940
 941 MODULE_AUTHOR("Sourav Poddar <sourav.poddar@ti.com>");
 942 MODULE_LICENSE("GPL v2");
 943 MODULE_DESCRIPTION("TI QSPI controller driver");
 944 MODULE_ALIAS("platform:ti-qspi");