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_get_sync(qspi->dev); 176 if (ret < 0) { 177 pm_runtime_put_noidle(qspi->dev); 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 u32 rx; 319 u8 rxlen, rx_wlen; 320 u8 *rxbuf; 321 322 rxbuf = t->rx_buf; 323 cmd = qspi->cmd; 324 switch (t->rx_nbits) { 325 case SPI_NBITS_DUAL: 326 cmd |= QSPI_RD_DUAL; 327 break; 328 case SPI_NBITS_QUAD: 329 cmd |= QSPI_RD_QUAD; 330 break; 331 default: 332 cmd |= QSPI_RD_SNGL; 333 break; 334 } 335 wlen = t->bits_per_word >> 3; /* in bytes */ 336 rx_wlen = wlen; 337 338 while (count) { 339 dev_dbg(qspi->dev, "rx cmd %08x dc %08x\n", cmd, qspi->dc); 340 if (qspi_is_busy(qspi)) 341 return -EBUSY; 342 343 switch (wlen) { 344 case 1: 345 /* 346 * Optimize the 8-bit words transfers, as used by 347 * the SPI flash devices. 348 */ 349 if (count >= QSPI_WLEN_MAX_BYTES) { 350 rxlen = QSPI_WLEN_MAX_BYTES; 351 } else { 352 rxlen = min(count, 4); 353 } 354 rx_wlen = rxlen << 3; 355 cmd &= ~QSPI_WLEN_MASK; 356 cmd |= QSPI_WLEN(rx_wlen); 357 break; 358 default: 359 rxlen = wlen; 360 break; 361 } 362 363 ti_qspi_write(qspi, cmd, QSPI_SPI_CMD_REG); 364 if (ti_qspi_poll_wc(qspi)) { 365 dev_err(qspi->dev, "read timed out\n"); 366 return -ETIMEDOUT; 367 } 368 369 switch (wlen) { 370 case 1: 371 /* 372 * Optimize the 8-bit words transfers, as used by 373 * the SPI flash devices. 374 */ 375 if (count >= QSPI_WLEN_MAX_BYTES) { 376 u32 *rxp = (u32 *) rxbuf; 377 rx = readl(qspi->base + QSPI_SPI_DATA_REG_3); 378 *rxp++ = be32_to_cpu(rx); 379 rx = readl(qspi->base + QSPI_SPI_DATA_REG_2); 380 *rxp++ = be32_to_cpu(rx); 381 rx = readl(qspi->base + QSPI_SPI_DATA_REG_1); 382 *rxp++ = be32_to_cpu(rx); 383 rx = readl(qspi->base + QSPI_SPI_DATA_REG); 384 *rxp++ = be32_to_cpu(rx); 385 } else { 386 u8 *rxp = rxbuf; 387 rx = readl(qspi->base + QSPI_SPI_DATA_REG); 388 if (rx_wlen >= 8) 389 *rxp++ = rx >> (rx_wlen - 8); 390 if (rx_wlen >= 16) 391 *rxp++ = rx >> (rx_wlen - 16); 392 if (rx_wlen >= 24) 393 *rxp++ = rx >> (rx_wlen - 24); 394 if (rx_wlen >= 32) 395 *rxp++ = rx; 396 } 397 break; 398 case 2: 399 *((u16 *)rxbuf) = readw(qspi->base + QSPI_SPI_DATA_REG); 400 break; 401 case 4: 402 *((u32 *)rxbuf) = readl(qspi->base + QSPI_SPI_DATA_REG); 403 break; 404 } 405 rxbuf += rxlen; 406 count -= rxlen; 407 } 408 409 return 0; 410 } 411 412 static int qspi_transfer_msg(struct ti_qspi *qspi, struct spi_transfer *t, 413 int count) 414 { 415 int ret; 416 417 if (t->tx_buf) { 418 ret = qspi_write_msg(qspi, t, count); 419 if (ret) { 420 dev_dbg(qspi->dev, "Error while writing\n"); 421 return ret; 422 } 423 } 424 425 if (t->rx_buf) { 426 ret = qspi_read_msg(qspi, t, count); 427 if (ret) { 428 dev_dbg(qspi->dev, "Error while reading\n"); 429 return ret; 430 } 431 } 432 433 return 0; 434 } 435 436 static void ti_qspi_dma_callback(void *param) 437 { 438 struct ti_qspi *qspi = param; 439 440 complete(&qspi->transfer_complete); 441 } 442 443 static int ti_qspi_dma_xfer(struct ti_qspi *qspi, dma_addr_t dma_dst, 444 dma_addr_t dma_src, size_t len) 445 { 446 struct dma_chan *chan = qspi->rx_chan; 447 dma_cookie_t cookie; 448 enum dma_ctrl_flags flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT; 449 struct dma_async_tx_descriptor *tx; 450 int ret; 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 ret = wait_for_completion_timeout(&qspi->transfer_complete, 471 msecs_to_jiffies(len)); 472 if (ret <= 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 const struct of_device_id ti_qspi_match[] = { 737 {.compatible = "ti,dra7xxx-qspi" }, 738 {.compatible = "ti,am4372-qspi" }, 739 {}, 740 }; 741 MODULE_DEVICE_TABLE(of, ti_qspi_match); 742 743 static int ti_qspi_probe(struct platform_device *pdev) 744 { 745 struct ti_qspi *qspi; 746 struct spi_master *master; 747 struct resource *r, *res_mmap; 748 struct device_node *np = pdev->dev.of_node; 749 u32 max_freq; 750 int ret = 0, num_cs, irq; 751 dma_cap_mask_t mask; 752 753 master = spi_alloc_master(&pdev->dev, sizeof(*qspi)); 754 if (!master) 755 return -ENOMEM; 756 757 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD; 758 759 master->flags = SPI_MASTER_HALF_DUPLEX; 760 master->setup = ti_qspi_setup; 761 master->auto_runtime_pm = true; 762 master->transfer_one_message = ti_qspi_start_transfer_one; 763 master->dev.of_node = pdev->dev.of_node; 764 master->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(16) | 765 SPI_BPW_MASK(8); 766 master->mem_ops = &ti_qspi_mem_ops; 767 768 if (!of_property_read_u32(np, "num-cs", &num_cs)) 769 master->num_chipselect = num_cs; 770 771 qspi = spi_master_get_devdata(master); 772 qspi->master = master; 773 qspi->dev = &pdev->dev; 774 platform_set_drvdata(pdev, qspi); 775 776 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qspi_base"); 777 if (r == NULL) { 778 r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 779 if (r == NULL) { 780 dev_err(&pdev->dev, "missing platform data\n"); 781 ret = -ENODEV; 782 goto free_master; 783 } 784 } 785 786 res_mmap = platform_get_resource_byname(pdev, 787 IORESOURCE_MEM, "qspi_mmap"); 788 if (res_mmap == NULL) { 789 res_mmap = platform_get_resource(pdev, IORESOURCE_MEM, 1); 790 if (res_mmap == NULL) { 791 dev_err(&pdev->dev, 792 "memory mapped resource not required\n"); 793 } 794 } 795 796 if (res_mmap) 797 qspi->mmap_size = resource_size(res_mmap); 798 799 irq = platform_get_irq(pdev, 0); 800 if (irq < 0) { 801 ret = irq; 802 goto free_master; 803 } 804 805 mutex_init(&qspi->list_lock); 806 807 qspi->base = devm_ioremap_resource(&pdev->dev, r); 808 if (IS_ERR(qspi->base)) { 809 ret = PTR_ERR(qspi->base); 810 goto free_master; 811 } 812 813 814 if (of_property_read_bool(np, "syscon-chipselects")) { 815 qspi->ctrl_base = 816 syscon_regmap_lookup_by_phandle(np, 817 "syscon-chipselects"); 818 if (IS_ERR(qspi->ctrl_base)) { 819 ret = PTR_ERR(qspi->ctrl_base); 820 goto free_master; 821 } 822 ret = of_property_read_u32_index(np, 823 "syscon-chipselects", 824 1, &qspi->ctrl_reg); 825 if (ret) { 826 dev_err(&pdev->dev, 827 "couldn't get ctrl_mod reg index\n"); 828 goto free_master; 829 } 830 } 831 832 qspi->fclk = devm_clk_get(&pdev->dev, "fck"); 833 if (IS_ERR(qspi->fclk)) { 834 ret = PTR_ERR(qspi->fclk); 835 dev_err(&pdev->dev, "could not get clk: %d\n", ret); 836 } 837 838 pm_runtime_use_autosuspend(&pdev->dev); 839 pm_runtime_set_autosuspend_delay(&pdev->dev, QSPI_AUTOSUSPEND_TIMEOUT); 840 pm_runtime_enable(&pdev->dev); 841 842 if (!of_property_read_u32(np, "spi-max-frequency", &max_freq)) 843 qspi->spi_max_frequency = max_freq; 844 845 dma_cap_zero(mask); 846 dma_cap_set(DMA_MEMCPY, mask); 847 848 qspi->rx_chan = dma_request_chan_by_mask(&mask); 849 if (IS_ERR(qspi->rx_chan)) { 850 dev_err(qspi->dev, 851 "No Rx DMA available, trying mmap mode\n"); 852 qspi->rx_chan = NULL; 853 ret = 0; 854 goto no_dma; 855 } 856 qspi->rx_bb_addr = dma_alloc_coherent(qspi->dev, 857 QSPI_DMA_BUFFER_SIZE, 858 &qspi->rx_bb_dma_addr, 859 GFP_KERNEL | GFP_DMA); 860 if (!qspi->rx_bb_addr) { 861 dev_err(qspi->dev, 862 "dma_alloc_coherent failed, using PIO mode\n"); 863 dma_release_channel(qspi->rx_chan); 864 goto no_dma; 865 } 866 master->dma_rx = qspi->rx_chan; 867 init_completion(&qspi->transfer_complete); 868 if (res_mmap) 869 qspi->mmap_phys_base = (dma_addr_t)res_mmap->start; 870 871 no_dma: 872 if (!qspi->rx_chan && res_mmap) { 873 qspi->mmap_base = devm_ioremap_resource(&pdev->dev, res_mmap); 874 if (IS_ERR(qspi->mmap_base)) { 875 dev_info(&pdev->dev, 876 "mmap failed with error %ld using PIO mode\n", 877 PTR_ERR(qspi->mmap_base)); 878 qspi->mmap_base = NULL; 879 master->mem_ops = NULL; 880 } 881 } 882 qspi->mmap_enabled = false; 883 qspi->current_cs = -1; 884 885 ret = devm_spi_register_master(&pdev->dev, master); 886 if (!ret) 887 return 0; 888 889 pm_runtime_disable(&pdev->dev); 890 free_master: 891 spi_master_put(master); 892 return ret; 893 } 894 895 static int ti_qspi_remove(struct platform_device *pdev) 896 { 897 struct ti_qspi *qspi = platform_get_drvdata(pdev); 898 int rc; 899 900 rc = spi_master_suspend(qspi->master); 901 if (rc) 902 return rc; 903 904 pm_runtime_put_sync(&pdev->dev); 905 pm_runtime_disable(&pdev->dev); 906 907 if (qspi->rx_bb_addr) 908 dma_free_coherent(qspi->dev, QSPI_DMA_BUFFER_SIZE, 909 qspi->rx_bb_addr, 910 qspi->rx_bb_dma_addr); 911 if (qspi->rx_chan) 912 dma_release_channel(qspi->rx_chan); 913 914 return 0; 915 } 916 917 static const struct dev_pm_ops ti_qspi_pm_ops = { 918 .runtime_resume = ti_qspi_runtime_resume, 919 }; 920 921 static struct platform_driver ti_qspi_driver = { 922 .probe = ti_qspi_probe, 923 .remove = ti_qspi_remove, 924 .driver = { 925 .name = "ti-qspi", 926 .pm = &ti_qspi_pm_ops, 927 .of_match_table = ti_qspi_match, 928 } 929 }; 930 931 module_platform_driver(ti_qspi_driver); 932 933 MODULE_AUTHOR("Sourav Poddar <sourav.poddar@ti.com>"); 934 MODULE_LICENSE("GPL v2"); 935 MODULE_DESCRIPTION("TI QSPI controller driver"); 936 MODULE_ALIAS("platform:ti-qspi"); 937