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 #include <linux/sizes.h> 37 38 #include <linux/spi/spi.h> 39 #include <linux/spi/spi-mem.h> 40 41 struct ti_qspi_regs { 42 u32 clkctrl; 43 }; 44 45 struct ti_qspi { 46 struct completion transfer_complete; 47 48 /* list synchronization */ 49 struct mutex list_lock; 50 51 struct spi_master *master; 52 void __iomem *base; 53 void __iomem *mmap_base; 54 size_t mmap_size; 55 struct regmap *ctrl_base; 56 unsigned int ctrl_reg; 57 struct clk *fclk; 58 struct device *dev; 59 60 struct ti_qspi_regs ctx_reg; 61 62 dma_addr_t mmap_phys_base; 63 dma_addr_t rx_bb_dma_addr; 64 void *rx_bb_addr; 65 struct dma_chan *rx_chan; 66 67 u32 spi_max_frequency; 68 u32 cmd; 69 u32 dc; 70 71 bool mmap_enabled; 72 }; 73 74 #define QSPI_PID (0x0) 75 #define QSPI_SYSCONFIG (0x10) 76 #define QSPI_SPI_CLOCK_CNTRL_REG (0x40) 77 #define QSPI_SPI_DC_REG (0x44) 78 #define QSPI_SPI_CMD_REG (0x48) 79 #define QSPI_SPI_STATUS_REG (0x4c) 80 #define QSPI_SPI_DATA_REG (0x50) 81 #define QSPI_SPI_SETUP_REG(n) ((0x54 + 4 * n)) 82 #define QSPI_SPI_SWITCH_REG (0x64) 83 #define QSPI_SPI_DATA_REG_1 (0x68) 84 #define QSPI_SPI_DATA_REG_2 (0x6c) 85 #define QSPI_SPI_DATA_REG_3 (0x70) 86 87 #define QSPI_COMPLETION_TIMEOUT msecs_to_jiffies(2000) 88 89 #define QSPI_FCLK 192000000 90 91 /* Clock Control */ 92 #define QSPI_CLK_EN (1 << 31) 93 #define QSPI_CLK_DIV_MAX 0xffff 94 95 /* Command */ 96 #define QSPI_EN_CS(n) (n << 28) 97 #define QSPI_WLEN(n) ((n - 1) << 19) 98 #define QSPI_3_PIN (1 << 18) 99 #define QSPI_RD_SNGL (1 << 16) 100 #define QSPI_WR_SNGL (2 << 16) 101 #define QSPI_RD_DUAL (3 << 16) 102 #define QSPI_RD_QUAD (7 << 16) 103 #define QSPI_INVAL (4 << 16) 104 #define QSPI_FLEN(n) ((n - 1) << 0) 105 #define QSPI_WLEN_MAX_BITS 128 106 #define QSPI_WLEN_MAX_BYTES 16 107 #define QSPI_WLEN_MASK QSPI_WLEN(QSPI_WLEN_MAX_BITS) 108 109 /* STATUS REGISTER */ 110 #define BUSY 0x01 111 #define WC 0x02 112 113 /* Device Control */ 114 #define QSPI_DD(m, n) (m << (3 + n * 8)) 115 #define QSPI_CKPHA(n) (1 << (2 + n * 8)) 116 #define QSPI_CSPOL(n) (1 << (1 + n * 8)) 117 #define QSPI_CKPOL(n) (1 << (n * 8)) 118 119 #define QSPI_FRAME 4096 120 121 #define QSPI_AUTOSUSPEND_TIMEOUT 2000 122 123 #define MEM_CS_EN(n) ((n + 1) << 8) 124 #define MEM_CS_MASK (7 << 8) 125 126 #define MM_SWITCH 0x1 127 128 #define QSPI_SETUP_RD_NORMAL (0x0 << 12) 129 #define QSPI_SETUP_RD_DUAL (0x1 << 12) 130 #define QSPI_SETUP_RD_QUAD (0x3 << 12) 131 #define QSPI_SETUP_ADDR_SHIFT 8 132 #define QSPI_SETUP_DUMMY_SHIFT 10 133 134 #define QSPI_DMA_BUFFER_SIZE SZ_64K 135 136 static inline unsigned long ti_qspi_read(struct ti_qspi *qspi, 137 unsigned long reg) 138 { 139 return readl(qspi->base + reg); 140 } 141 142 static inline void ti_qspi_write(struct ti_qspi *qspi, 143 unsigned long val, unsigned long reg) 144 { 145 writel(val, qspi->base + reg); 146 } 147 148 static int ti_qspi_setup(struct spi_device *spi) 149 { 150 struct ti_qspi *qspi = spi_master_get_devdata(spi->master); 151 struct ti_qspi_regs *ctx_reg = &qspi->ctx_reg; 152 int clk_div = 0, ret; 153 u32 clk_ctrl_reg, clk_rate, clk_mask; 154 155 if (spi->master->busy) { 156 dev_dbg(qspi->dev, "master busy doing other transfers\n"); 157 return -EBUSY; 158 } 159 160 if (!qspi->spi_max_frequency) { 161 dev_err(qspi->dev, "spi max frequency not defined\n"); 162 return -EINVAL; 163 } 164 165 clk_rate = clk_get_rate(qspi->fclk); 166 167 clk_div = DIV_ROUND_UP(clk_rate, qspi->spi_max_frequency) - 1; 168 169 if (clk_div < 0) { 170 dev_dbg(qspi->dev, "clock divider < 0, using /1 divider\n"); 171 return -EINVAL; 172 } 173 174 if (clk_div > QSPI_CLK_DIV_MAX) { 175 dev_dbg(qspi->dev, "clock divider >%d , using /%d divider\n", 176 QSPI_CLK_DIV_MAX, QSPI_CLK_DIV_MAX + 1); 177 return -EINVAL; 178 } 179 180 dev_dbg(qspi->dev, "hz: %d, clock divider %d\n", 181 qspi->spi_max_frequency, clk_div); 182 183 ret = pm_runtime_get_sync(qspi->dev); 184 if (ret < 0) { 185 dev_err(qspi->dev, "pm_runtime_get_sync() failed\n"); 186 return ret; 187 } 188 189 clk_ctrl_reg = ti_qspi_read(qspi, QSPI_SPI_CLOCK_CNTRL_REG); 190 191 clk_ctrl_reg &= ~QSPI_CLK_EN; 192 193 /* disable SCLK */ 194 ti_qspi_write(qspi, clk_ctrl_reg, QSPI_SPI_CLOCK_CNTRL_REG); 195 196 /* enable SCLK */ 197 clk_mask = QSPI_CLK_EN | clk_div; 198 ti_qspi_write(qspi, clk_mask, QSPI_SPI_CLOCK_CNTRL_REG); 199 ctx_reg->clkctrl = clk_mask; 200 201 pm_runtime_mark_last_busy(qspi->dev); 202 ret = pm_runtime_put_autosuspend(qspi->dev); 203 if (ret < 0) { 204 dev_err(qspi->dev, "pm_runtime_put_autosuspend() failed\n"); 205 return ret; 206 } 207 208 return 0; 209 } 210 211 static void ti_qspi_restore_ctx(struct ti_qspi *qspi) 212 { 213 struct ti_qspi_regs *ctx_reg = &qspi->ctx_reg; 214 215 ti_qspi_write(qspi, ctx_reg->clkctrl, QSPI_SPI_CLOCK_CNTRL_REG); 216 } 217 218 static inline u32 qspi_is_busy(struct ti_qspi *qspi) 219 { 220 u32 stat; 221 unsigned long timeout = jiffies + QSPI_COMPLETION_TIMEOUT; 222 223 stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG); 224 while ((stat & BUSY) && time_after(timeout, jiffies)) { 225 cpu_relax(); 226 stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG); 227 } 228 229 WARN(stat & BUSY, "qspi busy\n"); 230 return stat & BUSY; 231 } 232 233 static inline int ti_qspi_poll_wc(struct ti_qspi *qspi) 234 { 235 u32 stat; 236 unsigned long timeout = jiffies + QSPI_COMPLETION_TIMEOUT; 237 238 do { 239 stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG); 240 if (stat & WC) 241 return 0; 242 cpu_relax(); 243 } while (time_after(timeout, jiffies)); 244 245 stat = ti_qspi_read(qspi, QSPI_SPI_STATUS_REG); 246 if (stat & WC) 247 return 0; 248 return -ETIMEDOUT; 249 } 250 251 static int qspi_write_msg(struct ti_qspi *qspi, struct spi_transfer *t, 252 int count) 253 { 254 int wlen, xfer_len; 255 unsigned int cmd; 256 const u8 *txbuf; 257 u32 data; 258 259 txbuf = t->tx_buf; 260 cmd = qspi->cmd | QSPI_WR_SNGL; 261 wlen = t->bits_per_word >> 3; /* in bytes */ 262 xfer_len = wlen; 263 264 while (count) { 265 if (qspi_is_busy(qspi)) 266 return -EBUSY; 267 268 switch (wlen) { 269 case 1: 270 dev_dbg(qspi->dev, "tx cmd %08x dc %08x data %02x\n", 271 cmd, qspi->dc, *txbuf); 272 if (count >= QSPI_WLEN_MAX_BYTES) { 273 u32 *txp = (u32 *)txbuf; 274 275 data = cpu_to_be32(*txp++); 276 writel(data, qspi->base + 277 QSPI_SPI_DATA_REG_3); 278 data = cpu_to_be32(*txp++); 279 writel(data, qspi->base + 280 QSPI_SPI_DATA_REG_2); 281 data = cpu_to_be32(*txp++); 282 writel(data, qspi->base + 283 QSPI_SPI_DATA_REG_1); 284 data = cpu_to_be32(*txp++); 285 writel(data, qspi->base + 286 QSPI_SPI_DATA_REG); 287 xfer_len = QSPI_WLEN_MAX_BYTES; 288 cmd |= QSPI_WLEN(QSPI_WLEN_MAX_BITS); 289 } else { 290 writeb(*txbuf, qspi->base + QSPI_SPI_DATA_REG); 291 cmd = qspi->cmd | QSPI_WR_SNGL; 292 xfer_len = wlen; 293 cmd |= QSPI_WLEN(wlen); 294 } 295 break; 296 case 2: 297 dev_dbg(qspi->dev, "tx cmd %08x dc %08x data %04x\n", 298 cmd, qspi->dc, *txbuf); 299 writew(*((u16 *)txbuf), qspi->base + QSPI_SPI_DATA_REG); 300 break; 301 case 4: 302 dev_dbg(qspi->dev, "tx cmd %08x dc %08x data %08x\n", 303 cmd, qspi->dc, *txbuf); 304 writel(*((u32 *)txbuf), qspi->base + QSPI_SPI_DATA_REG); 305 break; 306 } 307 308 ti_qspi_write(qspi, cmd, QSPI_SPI_CMD_REG); 309 if (ti_qspi_poll_wc(qspi)) { 310 dev_err(qspi->dev, "write timed out\n"); 311 return -ETIMEDOUT; 312 } 313 txbuf += xfer_len; 314 count -= xfer_len; 315 } 316 317 return 0; 318 } 319 320 static int qspi_read_msg(struct ti_qspi *qspi, struct spi_transfer *t, 321 int count) 322 { 323 int wlen; 324 unsigned int cmd; 325 u8 *rxbuf; 326 327 rxbuf = t->rx_buf; 328 cmd = qspi->cmd; 329 switch (t->rx_nbits) { 330 case SPI_NBITS_DUAL: 331 cmd |= QSPI_RD_DUAL; 332 break; 333 case SPI_NBITS_QUAD: 334 cmd |= QSPI_RD_QUAD; 335 break; 336 default: 337 cmd |= QSPI_RD_SNGL; 338 break; 339 } 340 wlen = t->bits_per_word >> 3; /* in bytes */ 341 342 while (count) { 343 dev_dbg(qspi->dev, "rx cmd %08x dc %08x\n", cmd, qspi->dc); 344 if (qspi_is_busy(qspi)) 345 return -EBUSY; 346 347 ti_qspi_write(qspi, cmd, QSPI_SPI_CMD_REG); 348 if (ti_qspi_poll_wc(qspi)) { 349 dev_err(qspi->dev, "read timed out\n"); 350 return -ETIMEDOUT; 351 } 352 switch (wlen) { 353 case 1: 354 *rxbuf = readb(qspi->base + QSPI_SPI_DATA_REG); 355 break; 356 case 2: 357 *((u16 *)rxbuf) = readw(qspi->base + QSPI_SPI_DATA_REG); 358 break; 359 case 4: 360 *((u32 *)rxbuf) = readl(qspi->base + QSPI_SPI_DATA_REG); 361 break; 362 } 363 rxbuf += wlen; 364 count -= wlen; 365 } 366 367 return 0; 368 } 369 370 static int qspi_transfer_msg(struct ti_qspi *qspi, struct spi_transfer *t, 371 int count) 372 { 373 int ret; 374 375 if (t->tx_buf) { 376 ret = qspi_write_msg(qspi, t, count); 377 if (ret) { 378 dev_dbg(qspi->dev, "Error while writing\n"); 379 return ret; 380 } 381 } 382 383 if (t->rx_buf) { 384 ret = qspi_read_msg(qspi, t, count); 385 if (ret) { 386 dev_dbg(qspi->dev, "Error while reading\n"); 387 return ret; 388 } 389 } 390 391 return 0; 392 } 393 394 static void ti_qspi_dma_callback(void *param) 395 { 396 struct ti_qspi *qspi = param; 397 398 complete(&qspi->transfer_complete); 399 } 400 401 static int ti_qspi_dma_xfer(struct ti_qspi *qspi, dma_addr_t dma_dst, 402 dma_addr_t dma_src, size_t len) 403 { 404 struct dma_chan *chan = qspi->rx_chan; 405 dma_cookie_t cookie; 406 enum dma_ctrl_flags flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT; 407 struct dma_async_tx_descriptor *tx; 408 int ret; 409 410 tx = dmaengine_prep_dma_memcpy(chan, dma_dst, dma_src, len, flags); 411 if (!tx) { 412 dev_err(qspi->dev, "device_prep_dma_memcpy error\n"); 413 return -EIO; 414 } 415 416 tx->callback = ti_qspi_dma_callback; 417 tx->callback_param = qspi; 418 cookie = tx->tx_submit(tx); 419 reinit_completion(&qspi->transfer_complete); 420 421 ret = dma_submit_error(cookie); 422 if (ret) { 423 dev_err(qspi->dev, "dma_submit_error %d\n", cookie); 424 return -EIO; 425 } 426 427 dma_async_issue_pending(chan); 428 ret = wait_for_completion_timeout(&qspi->transfer_complete, 429 msecs_to_jiffies(len)); 430 if (ret <= 0) { 431 dmaengine_terminate_sync(chan); 432 dev_err(qspi->dev, "DMA wait_for_completion_timeout\n"); 433 return -ETIMEDOUT; 434 } 435 436 return 0; 437 } 438 439 static int ti_qspi_dma_bounce_buffer(struct ti_qspi *qspi, loff_t offs, 440 void *to, size_t readsize) 441 { 442 dma_addr_t dma_src = qspi->mmap_phys_base + offs; 443 int ret = 0; 444 445 /* 446 * Use bounce buffer as FS like jffs2, ubifs may pass 447 * buffers that does not belong to kernel lowmem region. 448 */ 449 while (readsize != 0) { 450 size_t xfer_len = min_t(size_t, QSPI_DMA_BUFFER_SIZE, 451 readsize); 452 453 ret = ti_qspi_dma_xfer(qspi, qspi->rx_bb_dma_addr, 454 dma_src, xfer_len); 455 if (ret != 0) 456 return ret; 457 memcpy(to, qspi->rx_bb_addr, xfer_len); 458 readsize -= xfer_len; 459 dma_src += xfer_len; 460 to += xfer_len; 461 } 462 463 return ret; 464 } 465 466 static int ti_qspi_dma_xfer_sg(struct ti_qspi *qspi, struct sg_table rx_sg, 467 loff_t from) 468 { 469 struct scatterlist *sg; 470 dma_addr_t dma_src = qspi->mmap_phys_base + from; 471 dma_addr_t dma_dst; 472 int i, len, ret; 473 474 for_each_sg(rx_sg.sgl, sg, rx_sg.nents, i) { 475 dma_dst = sg_dma_address(sg); 476 len = sg_dma_len(sg); 477 ret = ti_qspi_dma_xfer(qspi, dma_dst, dma_src, len); 478 if (ret) 479 return ret; 480 dma_src += len; 481 } 482 483 return 0; 484 } 485 486 static void ti_qspi_enable_memory_map(struct spi_device *spi) 487 { 488 struct ti_qspi *qspi = spi_master_get_devdata(spi->master); 489 490 ti_qspi_write(qspi, MM_SWITCH, QSPI_SPI_SWITCH_REG); 491 if (qspi->ctrl_base) { 492 regmap_update_bits(qspi->ctrl_base, qspi->ctrl_reg, 493 MEM_CS_MASK, 494 MEM_CS_EN(spi->chip_select)); 495 } 496 qspi->mmap_enabled = true; 497 } 498 499 static void ti_qspi_disable_memory_map(struct spi_device *spi) 500 { 501 struct ti_qspi *qspi = spi_master_get_devdata(spi->master); 502 503 ti_qspi_write(qspi, 0, QSPI_SPI_SWITCH_REG); 504 if (qspi->ctrl_base) 505 regmap_update_bits(qspi->ctrl_base, qspi->ctrl_reg, 506 MEM_CS_MASK, 0); 507 qspi->mmap_enabled = false; 508 } 509 510 static void ti_qspi_setup_mmap_read(struct spi_device *spi, u8 opcode, 511 u8 data_nbits, u8 addr_width, 512 u8 dummy_bytes) 513 { 514 struct ti_qspi *qspi = spi_master_get_devdata(spi->master); 515 u32 memval = opcode; 516 517 switch (data_nbits) { 518 case SPI_NBITS_QUAD: 519 memval |= QSPI_SETUP_RD_QUAD; 520 break; 521 case SPI_NBITS_DUAL: 522 memval |= QSPI_SETUP_RD_DUAL; 523 break; 524 default: 525 memval |= QSPI_SETUP_RD_NORMAL; 526 break; 527 } 528 memval |= ((addr_width - 1) << QSPI_SETUP_ADDR_SHIFT | 529 dummy_bytes << QSPI_SETUP_DUMMY_SHIFT); 530 ti_qspi_write(qspi, memval, 531 QSPI_SPI_SETUP_REG(spi->chip_select)); 532 } 533 534 static int ti_qspi_exec_mem_op(struct spi_mem *mem, 535 const struct spi_mem_op *op) 536 { 537 struct ti_qspi *qspi = spi_master_get_devdata(mem->spi->master); 538 u32 from = 0; 539 int ret = 0; 540 541 /* Only optimize read path. */ 542 if (!op->data.nbytes || op->data.dir != SPI_MEM_DATA_IN || 543 !op->addr.nbytes || op->addr.nbytes > 4) 544 return -ENOTSUPP; 545 546 /* Address exceeds MMIO window size, fall back to regular mode. */ 547 from = op->addr.val; 548 if (from + op->data.nbytes > qspi->mmap_size) 549 return -ENOTSUPP; 550 551 mutex_lock(&qspi->list_lock); 552 553 if (!qspi->mmap_enabled) 554 ti_qspi_enable_memory_map(mem->spi); 555 ti_qspi_setup_mmap_read(mem->spi, op->cmd.opcode, op->data.buswidth, 556 op->addr.nbytes, op->dummy.nbytes); 557 558 if (qspi->rx_chan) { 559 struct sg_table sgt; 560 561 if (virt_addr_valid(op->data.buf.in) && 562 !spi_controller_dma_map_mem_op_data(mem->spi->master, op, 563 &sgt)) { 564 ret = ti_qspi_dma_xfer_sg(qspi, sgt, from); 565 spi_controller_dma_unmap_mem_op_data(mem->spi->master, 566 op, &sgt); 567 } else { 568 ret = ti_qspi_dma_bounce_buffer(qspi, from, 569 op->data.buf.in, 570 op->data.nbytes); 571 } 572 } else { 573 memcpy_fromio(op->data.buf.in, qspi->mmap_base + from, 574 op->data.nbytes); 575 } 576 577 mutex_unlock(&qspi->list_lock); 578 579 return ret; 580 } 581 582 static const struct spi_controller_mem_ops ti_qspi_mem_ops = { 583 .exec_op = ti_qspi_exec_mem_op, 584 }; 585 586 static int ti_qspi_start_transfer_one(struct spi_master *master, 587 struct spi_message *m) 588 { 589 struct ti_qspi *qspi = spi_master_get_devdata(master); 590 struct spi_device *spi = m->spi; 591 struct spi_transfer *t; 592 int status = 0, ret; 593 unsigned int frame_len_words, transfer_len_words; 594 int wlen; 595 596 /* setup device control reg */ 597 qspi->dc = 0; 598 599 if (spi->mode & SPI_CPHA) 600 qspi->dc |= QSPI_CKPHA(spi->chip_select); 601 if (spi->mode & SPI_CPOL) 602 qspi->dc |= QSPI_CKPOL(spi->chip_select); 603 if (spi->mode & SPI_CS_HIGH) 604 qspi->dc |= QSPI_CSPOL(spi->chip_select); 605 606 frame_len_words = 0; 607 list_for_each_entry(t, &m->transfers, transfer_list) 608 frame_len_words += t->len / (t->bits_per_word >> 3); 609 frame_len_words = min_t(unsigned int, frame_len_words, QSPI_FRAME); 610 611 /* setup command reg */ 612 qspi->cmd = 0; 613 qspi->cmd |= QSPI_EN_CS(spi->chip_select); 614 qspi->cmd |= QSPI_FLEN(frame_len_words); 615 616 ti_qspi_write(qspi, qspi->dc, QSPI_SPI_DC_REG); 617 618 mutex_lock(&qspi->list_lock); 619 620 if (qspi->mmap_enabled) 621 ti_qspi_disable_memory_map(spi); 622 623 list_for_each_entry(t, &m->transfers, transfer_list) { 624 qspi->cmd = ((qspi->cmd & ~QSPI_WLEN_MASK) | 625 QSPI_WLEN(t->bits_per_word)); 626 627 wlen = t->bits_per_word >> 3; 628 transfer_len_words = min(t->len / wlen, frame_len_words); 629 630 ret = qspi_transfer_msg(qspi, t, transfer_len_words * wlen); 631 if (ret) { 632 dev_dbg(qspi->dev, "transfer message failed\n"); 633 mutex_unlock(&qspi->list_lock); 634 return -EINVAL; 635 } 636 637 m->actual_length += transfer_len_words * wlen; 638 frame_len_words -= transfer_len_words; 639 if (frame_len_words == 0) 640 break; 641 } 642 643 mutex_unlock(&qspi->list_lock); 644 645 ti_qspi_write(qspi, qspi->cmd | QSPI_INVAL, QSPI_SPI_CMD_REG); 646 m->status = status; 647 spi_finalize_current_message(master); 648 649 return status; 650 } 651 652 static int ti_qspi_runtime_resume(struct device *dev) 653 { 654 struct ti_qspi *qspi; 655 656 qspi = dev_get_drvdata(dev); 657 ti_qspi_restore_ctx(qspi); 658 659 return 0; 660 } 661 662 static const struct of_device_id ti_qspi_match[] = { 663 {.compatible = "ti,dra7xxx-qspi" }, 664 {.compatible = "ti,am4372-qspi" }, 665 {}, 666 }; 667 MODULE_DEVICE_TABLE(of, ti_qspi_match); 668 669 static int ti_qspi_probe(struct platform_device *pdev) 670 { 671 struct ti_qspi *qspi; 672 struct spi_master *master; 673 struct resource *r, *res_mmap; 674 struct device_node *np = pdev->dev.of_node; 675 u32 max_freq; 676 int ret = 0, num_cs, irq; 677 dma_cap_mask_t mask; 678 679 master = spi_alloc_master(&pdev->dev, sizeof(*qspi)); 680 if (!master) 681 return -ENOMEM; 682 683 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD; 684 685 master->flags = SPI_MASTER_HALF_DUPLEX; 686 master->setup = ti_qspi_setup; 687 master->auto_runtime_pm = true; 688 master->transfer_one_message = ti_qspi_start_transfer_one; 689 master->dev.of_node = pdev->dev.of_node; 690 master->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(16) | 691 SPI_BPW_MASK(8); 692 master->mem_ops = &ti_qspi_mem_ops; 693 694 if (!of_property_read_u32(np, "num-cs", &num_cs)) 695 master->num_chipselect = num_cs; 696 697 qspi = spi_master_get_devdata(master); 698 qspi->master = master; 699 qspi->dev = &pdev->dev; 700 platform_set_drvdata(pdev, qspi); 701 702 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qspi_base"); 703 if (r == NULL) { 704 r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 705 if (r == NULL) { 706 dev_err(&pdev->dev, "missing platform data\n"); 707 ret = -ENODEV; 708 goto free_master; 709 } 710 } 711 712 res_mmap = platform_get_resource_byname(pdev, 713 IORESOURCE_MEM, "qspi_mmap"); 714 if (res_mmap == NULL) { 715 res_mmap = platform_get_resource(pdev, IORESOURCE_MEM, 1); 716 if (res_mmap == NULL) { 717 dev_err(&pdev->dev, 718 "memory mapped resource not required\n"); 719 } 720 } 721 722 if (res_mmap) 723 qspi->mmap_size = resource_size(res_mmap); 724 725 irq = platform_get_irq(pdev, 0); 726 if (irq < 0) { 727 dev_err(&pdev->dev, "no irq resource?\n"); 728 ret = irq; 729 goto free_master; 730 } 731 732 mutex_init(&qspi->list_lock); 733 734 qspi->base = devm_ioremap_resource(&pdev->dev, r); 735 if (IS_ERR(qspi->base)) { 736 ret = PTR_ERR(qspi->base); 737 goto free_master; 738 } 739 740 741 if (of_property_read_bool(np, "syscon-chipselects")) { 742 qspi->ctrl_base = 743 syscon_regmap_lookup_by_phandle(np, 744 "syscon-chipselects"); 745 if (IS_ERR(qspi->ctrl_base)) { 746 ret = PTR_ERR(qspi->ctrl_base); 747 goto free_master; 748 } 749 ret = of_property_read_u32_index(np, 750 "syscon-chipselects", 751 1, &qspi->ctrl_reg); 752 if (ret) { 753 dev_err(&pdev->dev, 754 "couldn't get ctrl_mod reg index\n"); 755 goto free_master; 756 } 757 } 758 759 qspi->fclk = devm_clk_get(&pdev->dev, "fck"); 760 if (IS_ERR(qspi->fclk)) { 761 ret = PTR_ERR(qspi->fclk); 762 dev_err(&pdev->dev, "could not get clk: %d\n", ret); 763 } 764 765 pm_runtime_use_autosuspend(&pdev->dev); 766 pm_runtime_set_autosuspend_delay(&pdev->dev, QSPI_AUTOSUSPEND_TIMEOUT); 767 pm_runtime_enable(&pdev->dev); 768 769 if (!of_property_read_u32(np, "spi-max-frequency", &max_freq)) 770 qspi->spi_max_frequency = max_freq; 771 772 dma_cap_zero(mask); 773 dma_cap_set(DMA_MEMCPY, mask); 774 775 qspi->rx_chan = dma_request_chan_by_mask(&mask); 776 if (IS_ERR(qspi->rx_chan)) { 777 dev_err(qspi->dev, 778 "No Rx DMA available, trying mmap mode\n"); 779 qspi->rx_chan = NULL; 780 ret = 0; 781 goto no_dma; 782 } 783 qspi->rx_bb_addr = dma_alloc_coherent(qspi->dev, 784 QSPI_DMA_BUFFER_SIZE, 785 &qspi->rx_bb_dma_addr, 786 GFP_KERNEL | GFP_DMA); 787 if (!qspi->rx_bb_addr) { 788 dev_err(qspi->dev, 789 "dma_alloc_coherent failed, using PIO mode\n"); 790 dma_release_channel(qspi->rx_chan); 791 goto no_dma; 792 } 793 master->dma_rx = qspi->rx_chan; 794 init_completion(&qspi->transfer_complete); 795 if (res_mmap) 796 qspi->mmap_phys_base = (dma_addr_t)res_mmap->start; 797 798 no_dma: 799 if (!qspi->rx_chan && res_mmap) { 800 qspi->mmap_base = devm_ioremap_resource(&pdev->dev, res_mmap); 801 if (IS_ERR(qspi->mmap_base)) { 802 dev_info(&pdev->dev, 803 "mmap failed with error %ld using PIO mode\n", 804 PTR_ERR(qspi->mmap_base)); 805 qspi->mmap_base = NULL; 806 master->mem_ops = NULL; 807 } 808 } 809 qspi->mmap_enabled = false; 810 811 ret = devm_spi_register_master(&pdev->dev, master); 812 if (!ret) 813 return 0; 814 815 pm_runtime_disable(&pdev->dev); 816 free_master: 817 spi_master_put(master); 818 return ret; 819 } 820 821 static int ti_qspi_remove(struct platform_device *pdev) 822 { 823 struct ti_qspi *qspi = platform_get_drvdata(pdev); 824 int rc; 825 826 rc = spi_master_suspend(qspi->master); 827 if (rc) 828 return rc; 829 830 pm_runtime_put_sync(&pdev->dev); 831 pm_runtime_disable(&pdev->dev); 832 833 if (qspi->rx_bb_addr) 834 dma_free_coherent(qspi->dev, QSPI_DMA_BUFFER_SIZE, 835 qspi->rx_bb_addr, 836 qspi->rx_bb_dma_addr); 837 if (qspi->rx_chan) 838 dma_release_channel(qspi->rx_chan); 839 840 return 0; 841 } 842 843 static const struct dev_pm_ops ti_qspi_pm_ops = { 844 .runtime_resume = ti_qspi_runtime_resume, 845 }; 846 847 static struct platform_driver ti_qspi_driver = { 848 .probe = ti_qspi_probe, 849 .remove = ti_qspi_remove, 850 .driver = { 851 .name = "ti-qspi", 852 .pm = &ti_qspi_pm_ops, 853 .of_match_table = ti_qspi_match, 854 } 855 }; 856 857 module_platform_driver(ti_qspi_driver); 858 859 MODULE_AUTHOR("Sourav Poddar <sourav.poddar@ti.com>"); 860 MODULE_LICENSE("GPL v2"); 861 MODULE_DESCRIPTION("TI QSPI controller driver"); 862 MODULE_ALIAS("platform:ti-qspi"); 863