1 /* 2 * TI QSPI driver 3 * 4 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com 5 * Author: Sourav Poddar <sourav.poddar@ti.com> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GPLv2. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR /PURPOSE. See the 13 * GNU General Public License for more details. 14 */ 15 16 #include <linux/kernel.h> 17 #include <linux/init.h> 18 #include <linux/interrupt.h> 19 #include <linux/module.h> 20 #include <linux/device.h> 21 #include <linux/delay.h> 22 #include <linux/dma-mapping.h> 23 #include <linux/dmaengine.h> 24 #include <linux/omap-dma.h> 25 #include <linux/platform_device.h> 26 #include <linux/err.h> 27 #include <linux/clk.h> 28 #include <linux/io.h> 29 #include <linux/slab.h> 30 #include <linux/pm_runtime.h> 31 #include <linux/of.h> 32 #include <linux/of_device.h> 33 #include <linux/pinctrl/consumer.h> 34 #include <linux/mfd/syscon.h> 35 #include <linux/regmap.h> 36 37 #include <linux/spi/spi.h> 38 39 struct ti_qspi_regs { 40 u32 clkctrl; 41 }; 42 43 struct ti_qspi { 44 struct completion transfer_complete; 45 46 /* list synchronization */ 47 struct mutex list_lock; 48 49 struct spi_master *master; 50 void __iomem *base; 51 void __iomem *mmap_base; 52 struct regmap *ctrl_base; 53 unsigned int ctrl_reg; 54 struct clk *fclk; 55 struct device *dev; 56 57 struct ti_qspi_regs ctx_reg; 58 59 dma_addr_t mmap_phys_base; 60 struct dma_chan *rx_chan; 61 62 u32 spi_max_frequency; 63 u32 cmd; 64 u32 dc; 65 66 bool mmap_enabled; 67 }; 68 69 #define QSPI_PID (0x0) 70 #define QSPI_SYSCONFIG (0x10) 71 #define QSPI_SPI_CLOCK_CNTRL_REG (0x40) 72 #define QSPI_SPI_DC_REG (0x44) 73 #define QSPI_SPI_CMD_REG (0x48) 74 #define QSPI_SPI_STATUS_REG (0x4c) 75 #define QSPI_SPI_DATA_REG (0x50) 76 #define QSPI_SPI_SETUP_REG(n) ((0x54 + 4 * n)) 77 #define QSPI_SPI_SWITCH_REG (0x64) 78 #define QSPI_SPI_DATA_REG_1 (0x68) 79 #define QSPI_SPI_DATA_REG_2 (0x6c) 80 #define QSPI_SPI_DATA_REG_3 (0x70) 81 82 #define QSPI_COMPLETION_TIMEOUT msecs_to_jiffies(2000) 83 84 #define QSPI_FCLK 192000000 85 86 /* Clock Control */ 87 #define QSPI_CLK_EN (1 << 31) 88 #define QSPI_CLK_DIV_MAX 0xffff 89 90 /* Command */ 91 #define QSPI_EN_CS(n) (n << 28) 92 #define QSPI_WLEN(n) ((n - 1) << 19) 93 #define QSPI_3_PIN (1 << 18) 94 #define QSPI_RD_SNGL (1 << 16) 95 #define QSPI_WR_SNGL (2 << 16) 96 #define QSPI_RD_DUAL (3 << 16) 97 #define QSPI_RD_QUAD (7 << 16) 98 #define QSPI_INVAL (4 << 16) 99 #define QSPI_FLEN(n) ((n - 1) << 0) 100 #define QSPI_WLEN_MAX_BITS 128 101 #define QSPI_WLEN_MAX_BYTES 16 102 #define QSPI_WLEN_MASK QSPI_WLEN(QSPI_WLEN_MAX_BITS) 103 104 /* STATUS REGISTER */ 105 #define BUSY 0x01 106 #define WC 0x02 107 108 /* Device Control */ 109 #define QSPI_DD(m, n) (m << (3 + n * 8)) 110 #define QSPI_CKPHA(n) (1 << (2 + n * 8)) 111 #define QSPI_CSPOL(n) (1 << (1 + n * 8)) 112 #define QSPI_CKPOL(n) (1 << (n * 8)) 113 114 #define QSPI_FRAME 4096 115 116 #define QSPI_AUTOSUSPEND_TIMEOUT 2000 117 118 #define MEM_CS_EN(n) ((n + 1) << 8) 119 #define MEM_CS_MASK (7 << 8) 120 121 #define MM_SWITCH 0x1 122 123 #define QSPI_SETUP_RD_NORMAL (0x0 << 12) 124 #define QSPI_SETUP_RD_DUAL (0x1 << 12) 125 #define QSPI_SETUP_RD_QUAD (0x3 << 12) 126 #define QSPI_SETUP_ADDR_SHIFT 8 127 #define QSPI_SETUP_DUMMY_SHIFT 10 128 129 static inline unsigned long ti_qspi_read(struct ti_qspi *qspi, 130 unsigned long reg) 131 { 132 return readl(qspi->base + reg); 133 } 134 135 static inline void ti_qspi_write(struct ti_qspi *qspi, 136 unsigned long val, unsigned long reg) 137 { 138 writel(val, qspi->base + reg); 139 } 140 141 static int ti_qspi_setup(struct spi_device *spi) 142 { 143 struct ti_qspi *qspi = spi_master_get_devdata(spi->master); 144 struct ti_qspi_regs *ctx_reg = &qspi->ctx_reg; 145 int clk_div = 0, ret; 146 u32 clk_ctrl_reg, clk_rate, clk_mask; 147 148 if (spi->master->busy) { 149 dev_dbg(qspi->dev, "master busy doing other transfers\n"); 150 return -EBUSY; 151 } 152 153 if (!qspi->spi_max_frequency) { 154 dev_err(qspi->dev, "spi max frequency not defined\n"); 155 return -EINVAL; 156 } 157 158 clk_rate = clk_get_rate(qspi->fclk); 159 160 clk_div = DIV_ROUND_UP(clk_rate, qspi->spi_max_frequency) - 1; 161 162 if (clk_div < 0) { 163 dev_dbg(qspi->dev, "clock divider < 0, using /1 divider\n"); 164 return -EINVAL; 165 } 166 167 if (clk_div > QSPI_CLK_DIV_MAX) { 168 dev_dbg(qspi->dev, "clock divider >%d , using /%d divider\n", 169 QSPI_CLK_DIV_MAX, QSPI_CLK_DIV_MAX + 1); 170 return -EINVAL; 171 } 172 173 dev_dbg(qspi->dev, "hz: %d, clock divider %d\n", 174 qspi->spi_max_frequency, clk_div); 175 176 ret = pm_runtime_get_sync(qspi->dev); 177 if (ret < 0) { 178 dev_err(qspi->dev, "pm_runtime_get_sync() failed\n"); 179 return ret; 180 } 181 182 clk_ctrl_reg = ti_qspi_read(qspi, QSPI_SPI_CLOCK_CNTRL_REG); 183 184 clk_ctrl_reg &= ~QSPI_CLK_EN; 185 186 /* disable SCLK */ 187 ti_qspi_write(qspi, clk_ctrl_reg, QSPI_SPI_CLOCK_CNTRL_REG); 188 189 /* enable SCLK */ 190 clk_mask = QSPI_CLK_EN | clk_div; 191 ti_qspi_write(qspi, clk_mask, QSPI_SPI_CLOCK_CNTRL_REG); 192 ctx_reg->clkctrl = clk_mask; 193 194 pm_runtime_mark_last_busy(qspi->dev); 195 ret = pm_runtime_put_autosuspend(qspi->dev); 196 if (ret < 0) { 197 dev_err(qspi->dev, "pm_runtime_put_autosuspend() failed\n"); 198 return ret; 199 } 200 201 return 0; 202 } 203 204 static void ti_qspi_restore_ctx(struct ti_qspi *qspi) 205 { 206 struct ti_qspi_regs *ctx_reg = &qspi->ctx_reg; 207 208 ti_qspi_write(qspi, ctx_reg->clkctrl, QSPI_SPI_CLOCK_CNTRL_REG); 209 } 210 211 static inline u32 qspi_is_busy(struct ti_qspi *qspi) 212 { 213 u32 stat; 214 unsigned long timeout = jiffies + QSPI_COMPLETION_TIMEOUT; 215 216 stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG); 217 while ((stat & BUSY) && time_after(timeout, jiffies)) { 218 cpu_relax(); 219 stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG); 220 } 221 222 WARN(stat & BUSY, "qspi busy\n"); 223 return stat & BUSY; 224 } 225 226 static inline int ti_qspi_poll_wc(struct ti_qspi *qspi) 227 { 228 u32 stat; 229 unsigned long timeout = jiffies + QSPI_COMPLETION_TIMEOUT; 230 231 do { 232 stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG); 233 if (stat & WC) 234 return 0; 235 cpu_relax(); 236 } while (time_after(timeout, jiffies)); 237 238 stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG); 239 if (stat & WC) 240 return 0; 241 return -ETIMEDOUT; 242 } 243 244 static int qspi_write_msg(struct ti_qspi *qspi, struct spi_transfer *t, 245 int count) 246 { 247 int wlen, xfer_len; 248 unsigned int cmd; 249 const u8 *txbuf; 250 u32 data; 251 252 txbuf = t->tx_buf; 253 cmd = qspi->cmd | QSPI_WR_SNGL; 254 wlen = t->bits_per_word >> 3; /* in bytes */ 255 xfer_len = wlen; 256 257 while (count) { 258 if (qspi_is_busy(qspi)) 259 return -EBUSY; 260 261 switch (wlen) { 262 case 1: 263 dev_dbg(qspi->dev, "tx cmd %08x dc %08x data %02x\n", 264 cmd, qspi->dc, *txbuf); 265 if (count >= QSPI_WLEN_MAX_BYTES) { 266 u32 *txp = (u32 *)txbuf; 267 268 data = cpu_to_be32(*txp++); 269 writel(data, qspi->base + 270 QSPI_SPI_DATA_REG_3); 271 data = cpu_to_be32(*txp++); 272 writel(data, qspi->base + 273 QSPI_SPI_DATA_REG_2); 274 data = cpu_to_be32(*txp++); 275 writel(data, qspi->base + 276 QSPI_SPI_DATA_REG_1); 277 data = cpu_to_be32(*txp++); 278 writel(data, qspi->base + 279 QSPI_SPI_DATA_REG); 280 xfer_len = QSPI_WLEN_MAX_BYTES; 281 cmd |= QSPI_WLEN(QSPI_WLEN_MAX_BITS); 282 } else { 283 writeb(*txbuf, qspi->base + QSPI_SPI_DATA_REG); 284 cmd = qspi->cmd | QSPI_WR_SNGL; 285 xfer_len = wlen; 286 cmd |= QSPI_WLEN(wlen); 287 } 288 break; 289 case 2: 290 dev_dbg(qspi->dev, "tx cmd %08x dc %08x data %04x\n", 291 cmd, qspi->dc, *txbuf); 292 writew(*((u16 *)txbuf), qspi->base + QSPI_SPI_DATA_REG); 293 break; 294 case 4: 295 dev_dbg(qspi->dev, "tx cmd %08x dc %08x data %08x\n", 296 cmd, qspi->dc, *txbuf); 297 writel(*((u32 *)txbuf), qspi->base + QSPI_SPI_DATA_REG); 298 break; 299 } 300 301 ti_qspi_write(qspi, cmd, QSPI_SPI_CMD_REG); 302 if (ti_qspi_poll_wc(qspi)) { 303 dev_err(qspi->dev, "write timed out\n"); 304 return -ETIMEDOUT; 305 } 306 txbuf += xfer_len; 307 count -= xfer_len; 308 } 309 310 return 0; 311 } 312 313 static int qspi_read_msg(struct ti_qspi *qspi, struct spi_transfer *t, 314 int count) 315 { 316 int wlen; 317 unsigned int cmd; 318 u8 *rxbuf; 319 320 rxbuf = t->rx_buf; 321 cmd = qspi->cmd; 322 switch (t->rx_nbits) { 323 case SPI_NBITS_DUAL: 324 cmd |= QSPI_RD_DUAL; 325 break; 326 case SPI_NBITS_QUAD: 327 cmd |= QSPI_RD_QUAD; 328 break; 329 default: 330 cmd |= QSPI_RD_SNGL; 331 break; 332 } 333 wlen = t->bits_per_word >> 3; /* in bytes */ 334 335 while (count) { 336 dev_dbg(qspi->dev, "rx cmd %08x dc %08x\n", cmd, qspi->dc); 337 if (qspi_is_busy(qspi)) 338 return -EBUSY; 339 340 ti_qspi_write(qspi, cmd, QSPI_SPI_CMD_REG); 341 if (ti_qspi_poll_wc(qspi)) { 342 dev_err(qspi->dev, "read timed out\n"); 343 return -ETIMEDOUT; 344 } 345 switch (wlen) { 346 case 1: 347 *rxbuf = readb(qspi->base + QSPI_SPI_DATA_REG); 348 break; 349 case 2: 350 *((u16 *)rxbuf) = readw(qspi->base + QSPI_SPI_DATA_REG); 351 break; 352 case 4: 353 *((u32 *)rxbuf) = readl(qspi->base + QSPI_SPI_DATA_REG); 354 break; 355 } 356 rxbuf += wlen; 357 count -= wlen; 358 } 359 360 return 0; 361 } 362 363 static int qspi_transfer_msg(struct ti_qspi *qspi, struct spi_transfer *t, 364 int count) 365 { 366 int ret; 367 368 if (t->tx_buf) { 369 ret = qspi_write_msg(qspi, t, count); 370 if (ret) { 371 dev_dbg(qspi->dev, "Error while writing\n"); 372 return ret; 373 } 374 } 375 376 if (t->rx_buf) { 377 ret = qspi_read_msg(qspi, t, count); 378 if (ret) { 379 dev_dbg(qspi->dev, "Error while reading\n"); 380 return ret; 381 } 382 } 383 384 return 0; 385 } 386 387 static void ti_qspi_dma_callback(void *param) 388 { 389 struct ti_qspi *qspi = param; 390 391 complete(&qspi->transfer_complete); 392 } 393 394 static int ti_qspi_dma_xfer(struct ti_qspi *qspi, dma_addr_t dma_dst, 395 dma_addr_t dma_src, size_t len) 396 { 397 struct dma_chan *chan = qspi->rx_chan; 398 struct dma_device *dma_dev = chan->device; 399 dma_cookie_t cookie; 400 enum dma_ctrl_flags flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT; 401 struct dma_async_tx_descriptor *tx; 402 int ret; 403 404 tx = dma_dev->device_prep_dma_memcpy(chan, dma_dst, dma_src, 405 len, flags); 406 if (!tx) { 407 dev_err(qspi->dev, "device_prep_dma_memcpy error\n"); 408 return -EIO; 409 } 410 411 tx->callback = ti_qspi_dma_callback; 412 tx->callback_param = qspi; 413 cookie = tx->tx_submit(tx); 414 415 ret = dma_submit_error(cookie); 416 if (ret) { 417 dev_err(qspi->dev, "dma_submit_error %d\n", cookie); 418 return -EIO; 419 } 420 421 dma_async_issue_pending(chan); 422 ret = wait_for_completion_timeout(&qspi->transfer_complete, 423 msecs_to_jiffies(len)); 424 if (ret <= 0) { 425 dmaengine_terminate_sync(chan); 426 dev_err(qspi->dev, "DMA wait_for_completion_timeout\n"); 427 return -ETIMEDOUT; 428 } 429 430 return 0; 431 } 432 433 static int ti_qspi_dma_xfer_sg(struct ti_qspi *qspi, struct sg_table rx_sg, 434 loff_t from) 435 { 436 struct scatterlist *sg; 437 dma_addr_t dma_src = qspi->mmap_phys_base + from; 438 dma_addr_t dma_dst; 439 int i, len, ret; 440 441 for_each_sg(rx_sg.sgl, sg, rx_sg.nents, i) { 442 dma_dst = sg_dma_address(sg); 443 len = sg_dma_len(sg); 444 ret = ti_qspi_dma_xfer(qspi, dma_dst, dma_src, len); 445 if (ret) 446 return ret; 447 dma_src += len; 448 } 449 450 return 0; 451 } 452 453 static void ti_qspi_enable_memory_map(struct spi_device *spi) 454 { 455 struct ti_qspi *qspi = spi_master_get_devdata(spi->master); 456 457 ti_qspi_write(qspi, MM_SWITCH, QSPI_SPI_SWITCH_REG); 458 if (qspi->ctrl_base) { 459 regmap_update_bits(qspi->ctrl_base, qspi->ctrl_reg, 460 MEM_CS_EN(spi->chip_select), 461 MEM_CS_MASK); 462 } 463 qspi->mmap_enabled = true; 464 } 465 466 static void ti_qspi_disable_memory_map(struct spi_device *spi) 467 { 468 struct ti_qspi *qspi = spi_master_get_devdata(spi->master); 469 470 ti_qspi_write(qspi, 0, QSPI_SPI_SWITCH_REG); 471 if (qspi->ctrl_base) 472 regmap_update_bits(qspi->ctrl_base, qspi->ctrl_reg, 473 0, MEM_CS_MASK); 474 qspi->mmap_enabled = false; 475 } 476 477 static void ti_qspi_setup_mmap_read(struct spi_device *spi, 478 struct spi_flash_read_message *msg) 479 { 480 struct ti_qspi *qspi = spi_master_get_devdata(spi->master); 481 u32 memval = msg->read_opcode; 482 483 switch (msg->data_nbits) { 484 case SPI_NBITS_QUAD: 485 memval |= QSPI_SETUP_RD_QUAD; 486 break; 487 case SPI_NBITS_DUAL: 488 memval |= QSPI_SETUP_RD_DUAL; 489 break; 490 default: 491 memval |= QSPI_SETUP_RD_NORMAL; 492 break; 493 } 494 memval |= ((msg->addr_width - 1) << QSPI_SETUP_ADDR_SHIFT | 495 msg->dummy_bytes << QSPI_SETUP_DUMMY_SHIFT); 496 ti_qspi_write(qspi, memval, 497 QSPI_SPI_SETUP_REG(spi->chip_select)); 498 } 499 500 static int ti_qspi_spi_flash_read(struct spi_device *spi, 501 struct spi_flash_read_message *msg) 502 { 503 struct ti_qspi *qspi = spi_master_get_devdata(spi->master); 504 int ret = 0; 505 506 mutex_lock(&qspi->list_lock); 507 508 if (!qspi->mmap_enabled) 509 ti_qspi_enable_memory_map(spi); 510 ti_qspi_setup_mmap_read(spi, msg); 511 512 if (qspi->rx_chan) { 513 if (msg->cur_msg_mapped) { 514 ret = ti_qspi_dma_xfer_sg(qspi, msg->rx_sg, msg->from); 515 if (ret) 516 goto err_unlock; 517 } else { 518 dev_err(qspi->dev, "Invalid address for DMA\n"); 519 ret = -EIO; 520 goto err_unlock; 521 } 522 } else { 523 memcpy_fromio(msg->buf, qspi->mmap_base + msg->from, msg->len); 524 } 525 msg->retlen = msg->len; 526 527 err_unlock: 528 mutex_unlock(&qspi->list_lock); 529 530 return ret; 531 } 532 533 static int ti_qspi_start_transfer_one(struct spi_master *master, 534 struct spi_message *m) 535 { 536 struct ti_qspi *qspi = spi_master_get_devdata(master); 537 struct spi_device *spi = m->spi; 538 struct spi_transfer *t; 539 int status = 0, ret; 540 unsigned int frame_len_words, transfer_len_words; 541 int wlen; 542 543 /* setup device control reg */ 544 qspi->dc = 0; 545 546 if (spi->mode & SPI_CPHA) 547 qspi->dc |= QSPI_CKPHA(spi->chip_select); 548 if (spi->mode & SPI_CPOL) 549 qspi->dc |= QSPI_CKPOL(spi->chip_select); 550 if (spi->mode & SPI_CS_HIGH) 551 qspi->dc |= QSPI_CSPOL(spi->chip_select); 552 553 frame_len_words = 0; 554 list_for_each_entry(t, &m->transfers, transfer_list) 555 frame_len_words += t->len / (t->bits_per_word >> 3); 556 frame_len_words = min_t(unsigned int, frame_len_words, QSPI_FRAME); 557 558 /* setup command reg */ 559 qspi->cmd = 0; 560 qspi->cmd |= QSPI_EN_CS(spi->chip_select); 561 qspi->cmd |= QSPI_FLEN(frame_len_words); 562 563 ti_qspi_write(qspi, qspi->dc, QSPI_SPI_DC_REG); 564 565 mutex_lock(&qspi->list_lock); 566 567 if (qspi->mmap_enabled) 568 ti_qspi_disable_memory_map(spi); 569 570 list_for_each_entry(t, &m->transfers, transfer_list) { 571 qspi->cmd = ((qspi->cmd & ~QSPI_WLEN_MASK) | 572 QSPI_WLEN(t->bits_per_word)); 573 574 wlen = t->bits_per_word >> 3; 575 transfer_len_words = min(t->len / wlen, frame_len_words); 576 577 ret = qspi_transfer_msg(qspi, t, transfer_len_words * wlen); 578 if (ret) { 579 dev_dbg(qspi->dev, "transfer message failed\n"); 580 mutex_unlock(&qspi->list_lock); 581 return -EINVAL; 582 } 583 584 m->actual_length += transfer_len_words * wlen; 585 frame_len_words -= transfer_len_words; 586 if (frame_len_words == 0) 587 break; 588 } 589 590 mutex_unlock(&qspi->list_lock); 591 592 ti_qspi_write(qspi, qspi->cmd | QSPI_INVAL, QSPI_SPI_CMD_REG); 593 m->status = status; 594 spi_finalize_current_message(master); 595 596 return status; 597 } 598 599 static int ti_qspi_runtime_resume(struct device *dev) 600 { 601 struct ti_qspi *qspi; 602 603 qspi = dev_get_drvdata(dev); 604 ti_qspi_restore_ctx(qspi); 605 606 return 0; 607 } 608 609 static const struct of_device_id ti_qspi_match[] = { 610 {.compatible = "ti,dra7xxx-qspi" }, 611 {.compatible = "ti,am4372-qspi" }, 612 {}, 613 }; 614 MODULE_DEVICE_TABLE(of, ti_qspi_match); 615 616 static int ti_qspi_probe(struct platform_device *pdev) 617 { 618 struct ti_qspi *qspi; 619 struct spi_master *master; 620 struct resource *r, *res_mmap; 621 struct device_node *np = pdev->dev.of_node; 622 u32 max_freq; 623 int ret = 0, num_cs, irq; 624 dma_cap_mask_t mask; 625 626 master = spi_alloc_master(&pdev->dev, sizeof(*qspi)); 627 if (!master) 628 return -ENOMEM; 629 630 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD; 631 632 master->flags = SPI_MASTER_HALF_DUPLEX; 633 master->setup = ti_qspi_setup; 634 master->auto_runtime_pm = true; 635 master->transfer_one_message = ti_qspi_start_transfer_one; 636 master->dev.of_node = pdev->dev.of_node; 637 master->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(16) | 638 SPI_BPW_MASK(8); 639 master->spi_flash_read = ti_qspi_spi_flash_read; 640 641 if (!of_property_read_u32(np, "num-cs", &num_cs)) 642 master->num_chipselect = num_cs; 643 644 qspi = spi_master_get_devdata(master); 645 qspi->master = master; 646 qspi->dev = &pdev->dev; 647 platform_set_drvdata(pdev, qspi); 648 649 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qspi_base"); 650 if (r == NULL) { 651 r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 652 if (r == NULL) { 653 dev_err(&pdev->dev, "missing platform data\n"); 654 return -ENODEV; 655 } 656 } 657 658 res_mmap = platform_get_resource_byname(pdev, 659 IORESOURCE_MEM, "qspi_mmap"); 660 if (res_mmap == NULL) { 661 res_mmap = platform_get_resource(pdev, IORESOURCE_MEM, 1); 662 if (res_mmap == NULL) { 663 dev_err(&pdev->dev, 664 "memory mapped resource not required\n"); 665 } 666 } 667 668 irq = platform_get_irq(pdev, 0); 669 if (irq < 0) { 670 dev_err(&pdev->dev, "no irq resource?\n"); 671 return irq; 672 } 673 674 mutex_init(&qspi->list_lock); 675 676 qspi->base = devm_ioremap_resource(&pdev->dev, r); 677 if (IS_ERR(qspi->base)) { 678 ret = PTR_ERR(qspi->base); 679 goto free_master; 680 } 681 682 683 if (of_property_read_bool(np, "syscon-chipselects")) { 684 qspi->ctrl_base = 685 syscon_regmap_lookup_by_phandle(np, 686 "syscon-chipselects"); 687 if (IS_ERR(qspi->ctrl_base)) 688 return PTR_ERR(qspi->ctrl_base); 689 ret = of_property_read_u32_index(np, 690 "syscon-chipselects", 691 1, &qspi->ctrl_reg); 692 if (ret) { 693 dev_err(&pdev->dev, 694 "couldn't get ctrl_mod reg index\n"); 695 return ret; 696 } 697 } 698 699 qspi->fclk = devm_clk_get(&pdev->dev, "fck"); 700 if (IS_ERR(qspi->fclk)) { 701 ret = PTR_ERR(qspi->fclk); 702 dev_err(&pdev->dev, "could not get clk: %d\n", ret); 703 } 704 705 pm_runtime_use_autosuspend(&pdev->dev); 706 pm_runtime_set_autosuspend_delay(&pdev->dev, QSPI_AUTOSUSPEND_TIMEOUT); 707 pm_runtime_enable(&pdev->dev); 708 709 if (!of_property_read_u32(np, "spi-max-frequency", &max_freq)) 710 qspi->spi_max_frequency = max_freq; 711 712 dma_cap_zero(mask); 713 dma_cap_set(DMA_MEMCPY, mask); 714 715 qspi->rx_chan = dma_request_chan_by_mask(&mask); 716 if (!qspi->rx_chan) { 717 dev_err(qspi->dev, 718 "No Rx DMA available, trying mmap mode\n"); 719 ret = 0; 720 goto no_dma; 721 } 722 master->dma_rx = qspi->rx_chan; 723 init_completion(&qspi->transfer_complete); 724 if (res_mmap) 725 qspi->mmap_phys_base = (dma_addr_t)res_mmap->start; 726 727 no_dma: 728 if (!qspi->rx_chan && res_mmap) { 729 qspi->mmap_base = devm_ioremap_resource(&pdev->dev, res_mmap); 730 if (IS_ERR(qspi->mmap_base)) { 731 dev_info(&pdev->dev, 732 "mmap failed with error %ld using PIO mode\n", 733 PTR_ERR(qspi->mmap_base)); 734 qspi->mmap_base = NULL; 735 master->spi_flash_read = NULL; 736 } 737 } 738 qspi->mmap_enabled = false; 739 740 ret = devm_spi_register_master(&pdev->dev, master); 741 if (!ret) 742 return 0; 743 744 free_master: 745 spi_master_put(master); 746 return ret; 747 } 748 749 static int ti_qspi_remove(struct platform_device *pdev) 750 { 751 struct ti_qspi *qspi = platform_get_drvdata(pdev); 752 int rc; 753 754 rc = spi_master_suspend(qspi->master); 755 if (rc) 756 return rc; 757 758 pm_runtime_put_sync(&pdev->dev); 759 pm_runtime_disable(&pdev->dev); 760 761 if (qspi->rx_chan) 762 dma_release_channel(qspi->rx_chan); 763 764 return 0; 765 } 766 767 static const struct dev_pm_ops ti_qspi_pm_ops = { 768 .runtime_resume = ti_qspi_runtime_resume, 769 }; 770 771 static struct platform_driver ti_qspi_driver = { 772 .probe = ti_qspi_probe, 773 .remove = ti_qspi_remove, 774 .driver = { 775 .name = "ti-qspi", 776 .pm = &ti_qspi_pm_ops, 777 .of_match_table = ti_qspi_match, 778 } 779 }; 780 781 module_platform_driver(ti_qspi_driver); 782 783 MODULE_AUTHOR("Sourav Poddar <sourav.poddar@ti.com>"); 784 MODULE_LICENSE("GPL v2"); 785 MODULE_DESCRIPTION("TI QSPI controller driver"); 786 MODULE_ALIAS("platform:ti-qspi"); 787