1 /* 2 * OMAP2 McSPI controller driver 3 * 4 * Copyright (C) 2005, 2006 Nokia Corporation 5 * Author: Samuel Ortiz <samuel.ortiz@nokia.com> and 6 * Juha Yrj�l� <juha.yrjola@nokia.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 * 22 */ 23 24 #include <linux/kernel.h> 25 #include <linux/init.h> 26 #include <linux/interrupt.h> 27 #include <linux/module.h> 28 #include <linux/device.h> 29 #include <linux/delay.h> 30 #include <linux/dma-mapping.h> 31 #include <linux/dmaengine.h> 32 #include <linux/omap-dma.h> 33 #include <linux/platform_device.h> 34 #include <linux/err.h> 35 #include <linux/clk.h> 36 #include <linux/io.h> 37 #include <linux/slab.h> 38 #include <linux/pm_runtime.h> 39 #include <linux/of.h> 40 #include <linux/of_device.h> 41 #include <linux/pinctrl/consumer.h> 42 43 #include <linux/spi/spi.h> 44 45 #include <linux/platform_data/spi-omap2-mcspi.h> 46 47 #define OMAP2_MCSPI_MAX_FREQ 48000000 48 #define SPI_AUTOSUSPEND_TIMEOUT 2000 49 50 #define OMAP2_MCSPI_REVISION 0x00 51 #define OMAP2_MCSPI_SYSSTATUS 0x14 52 #define OMAP2_MCSPI_IRQSTATUS 0x18 53 #define OMAP2_MCSPI_IRQENABLE 0x1c 54 #define OMAP2_MCSPI_WAKEUPENABLE 0x20 55 #define OMAP2_MCSPI_SYST 0x24 56 #define OMAP2_MCSPI_MODULCTRL 0x28 57 58 /* per-channel banks, 0x14 bytes each, first is: */ 59 #define OMAP2_MCSPI_CHCONF0 0x2c 60 #define OMAP2_MCSPI_CHSTAT0 0x30 61 #define OMAP2_MCSPI_CHCTRL0 0x34 62 #define OMAP2_MCSPI_TX0 0x38 63 #define OMAP2_MCSPI_RX0 0x3c 64 65 /* per-register bitmasks: */ 66 67 #define OMAP2_MCSPI_MODULCTRL_SINGLE BIT(0) 68 #define OMAP2_MCSPI_MODULCTRL_MS BIT(2) 69 #define OMAP2_MCSPI_MODULCTRL_STEST BIT(3) 70 71 #define OMAP2_MCSPI_CHCONF_PHA BIT(0) 72 #define OMAP2_MCSPI_CHCONF_POL BIT(1) 73 #define OMAP2_MCSPI_CHCONF_CLKD_MASK (0x0f << 2) 74 #define OMAP2_MCSPI_CHCONF_EPOL BIT(6) 75 #define OMAP2_MCSPI_CHCONF_WL_MASK (0x1f << 7) 76 #define OMAP2_MCSPI_CHCONF_TRM_RX_ONLY BIT(12) 77 #define OMAP2_MCSPI_CHCONF_TRM_TX_ONLY BIT(13) 78 #define OMAP2_MCSPI_CHCONF_TRM_MASK (0x03 << 12) 79 #define OMAP2_MCSPI_CHCONF_DMAW BIT(14) 80 #define OMAP2_MCSPI_CHCONF_DMAR BIT(15) 81 #define OMAP2_MCSPI_CHCONF_DPE0 BIT(16) 82 #define OMAP2_MCSPI_CHCONF_DPE1 BIT(17) 83 #define OMAP2_MCSPI_CHCONF_IS BIT(18) 84 #define OMAP2_MCSPI_CHCONF_TURBO BIT(19) 85 #define OMAP2_MCSPI_CHCONF_FORCE BIT(20) 86 87 #define OMAP2_MCSPI_CHSTAT_RXS BIT(0) 88 #define OMAP2_MCSPI_CHSTAT_TXS BIT(1) 89 #define OMAP2_MCSPI_CHSTAT_EOT BIT(2) 90 91 #define OMAP2_MCSPI_CHCTRL_EN BIT(0) 92 93 #define OMAP2_MCSPI_WAKEUPENABLE_WKEN BIT(0) 94 95 /* We have 2 DMA channels per CS, one for RX and one for TX */ 96 struct omap2_mcspi_dma { 97 struct dma_chan *dma_tx; 98 struct dma_chan *dma_rx; 99 100 int dma_tx_sync_dev; 101 int dma_rx_sync_dev; 102 103 struct completion dma_tx_completion; 104 struct completion dma_rx_completion; 105 }; 106 107 /* use PIO for small transfers, avoiding DMA setup/teardown overhead and 108 * cache operations; better heuristics consider wordsize and bitrate. 109 */ 110 #define DMA_MIN_BYTES 160 111 112 113 /* 114 * Used for context save and restore, structure members to be updated whenever 115 * corresponding registers are modified. 116 */ 117 struct omap2_mcspi_regs { 118 u32 modulctrl; 119 u32 wakeupenable; 120 struct list_head cs; 121 }; 122 123 struct omap2_mcspi { 124 struct spi_master *master; 125 /* Virtual base address of the controller */ 126 void __iomem *base; 127 unsigned long phys; 128 /* SPI1 has 4 channels, while SPI2 has 2 */ 129 struct omap2_mcspi_dma *dma_channels; 130 struct device *dev; 131 struct omap2_mcspi_regs ctx; 132 unsigned int pin_dir:1; 133 }; 134 135 struct omap2_mcspi_cs { 136 void __iomem *base; 137 unsigned long phys; 138 int word_len; 139 struct list_head node; 140 /* Context save and restore shadow register */ 141 u32 chconf0; 142 }; 143 144 static inline void mcspi_write_reg(struct spi_master *master, 145 int idx, u32 val) 146 { 147 struct omap2_mcspi *mcspi = spi_master_get_devdata(master); 148 149 __raw_writel(val, mcspi->base + idx); 150 } 151 152 static inline u32 mcspi_read_reg(struct spi_master *master, int idx) 153 { 154 struct omap2_mcspi *mcspi = spi_master_get_devdata(master); 155 156 return __raw_readl(mcspi->base + idx); 157 } 158 159 static inline void mcspi_write_cs_reg(const struct spi_device *spi, 160 int idx, u32 val) 161 { 162 struct omap2_mcspi_cs *cs = spi->controller_state; 163 164 __raw_writel(val, cs->base + idx); 165 } 166 167 static inline u32 mcspi_read_cs_reg(const struct spi_device *spi, int idx) 168 { 169 struct omap2_mcspi_cs *cs = spi->controller_state; 170 171 return __raw_readl(cs->base + idx); 172 } 173 174 static inline u32 mcspi_cached_chconf0(const struct spi_device *spi) 175 { 176 struct omap2_mcspi_cs *cs = spi->controller_state; 177 178 return cs->chconf0; 179 } 180 181 static inline void mcspi_write_chconf0(const struct spi_device *spi, u32 val) 182 { 183 struct omap2_mcspi_cs *cs = spi->controller_state; 184 185 cs->chconf0 = val; 186 mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCONF0, val); 187 mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCONF0); 188 } 189 190 static void omap2_mcspi_set_dma_req(const struct spi_device *spi, 191 int is_read, int enable) 192 { 193 u32 l, rw; 194 195 l = mcspi_cached_chconf0(spi); 196 197 if (is_read) /* 1 is read, 0 write */ 198 rw = OMAP2_MCSPI_CHCONF_DMAR; 199 else 200 rw = OMAP2_MCSPI_CHCONF_DMAW; 201 202 if (enable) 203 l |= rw; 204 else 205 l &= ~rw; 206 207 mcspi_write_chconf0(spi, l); 208 } 209 210 static void omap2_mcspi_set_enable(const struct spi_device *spi, int enable) 211 { 212 u32 l; 213 214 l = enable ? OMAP2_MCSPI_CHCTRL_EN : 0; 215 mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCTRL0, l); 216 /* Flash post-writes */ 217 mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCTRL0); 218 } 219 220 static void omap2_mcspi_force_cs(struct spi_device *spi, int cs_active) 221 { 222 u32 l; 223 224 l = mcspi_cached_chconf0(spi); 225 if (cs_active) 226 l |= OMAP2_MCSPI_CHCONF_FORCE; 227 else 228 l &= ~OMAP2_MCSPI_CHCONF_FORCE; 229 230 mcspi_write_chconf0(spi, l); 231 } 232 233 static void omap2_mcspi_set_master_mode(struct spi_master *master) 234 { 235 struct omap2_mcspi *mcspi = spi_master_get_devdata(master); 236 struct omap2_mcspi_regs *ctx = &mcspi->ctx; 237 u32 l; 238 239 /* 240 * Setup when switching from (reset default) slave mode 241 * to single-channel master mode 242 */ 243 l = mcspi_read_reg(master, OMAP2_MCSPI_MODULCTRL); 244 l &= ~(OMAP2_MCSPI_MODULCTRL_STEST | OMAP2_MCSPI_MODULCTRL_MS); 245 l |= OMAP2_MCSPI_MODULCTRL_SINGLE; 246 mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, l); 247 248 ctx->modulctrl = l; 249 } 250 251 static void omap2_mcspi_restore_ctx(struct omap2_mcspi *mcspi) 252 { 253 struct spi_master *spi_cntrl = mcspi->master; 254 struct omap2_mcspi_regs *ctx = &mcspi->ctx; 255 struct omap2_mcspi_cs *cs; 256 257 /* McSPI: context restore */ 258 mcspi_write_reg(spi_cntrl, OMAP2_MCSPI_MODULCTRL, ctx->modulctrl); 259 mcspi_write_reg(spi_cntrl, OMAP2_MCSPI_WAKEUPENABLE, ctx->wakeupenable); 260 261 list_for_each_entry(cs, &ctx->cs, node) 262 __raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0); 263 } 264 265 static int omap2_prepare_transfer(struct spi_master *master) 266 { 267 struct omap2_mcspi *mcspi = spi_master_get_devdata(master); 268 269 pm_runtime_get_sync(mcspi->dev); 270 return 0; 271 } 272 273 static int omap2_unprepare_transfer(struct spi_master *master) 274 { 275 struct omap2_mcspi *mcspi = spi_master_get_devdata(master); 276 277 pm_runtime_mark_last_busy(mcspi->dev); 278 pm_runtime_put_autosuspend(mcspi->dev); 279 return 0; 280 } 281 282 static int mcspi_wait_for_reg_bit(void __iomem *reg, unsigned long bit) 283 { 284 unsigned long timeout; 285 286 timeout = jiffies + msecs_to_jiffies(1000); 287 while (!(__raw_readl(reg) & bit)) { 288 if (time_after(jiffies, timeout)) 289 return -1; 290 cpu_relax(); 291 } 292 return 0; 293 } 294 295 static void omap2_mcspi_rx_callback(void *data) 296 { 297 struct spi_device *spi = data; 298 struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master); 299 struct omap2_mcspi_dma *mcspi_dma = &mcspi->dma_channels[spi->chip_select]; 300 301 /* We must disable the DMA RX request */ 302 omap2_mcspi_set_dma_req(spi, 1, 0); 303 304 complete(&mcspi_dma->dma_rx_completion); 305 } 306 307 static void omap2_mcspi_tx_callback(void *data) 308 { 309 struct spi_device *spi = data; 310 struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master); 311 struct omap2_mcspi_dma *mcspi_dma = &mcspi->dma_channels[spi->chip_select]; 312 313 /* We must disable the DMA TX request */ 314 omap2_mcspi_set_dma_req(spi, 0, 0); 315 316 complete(&mcspi_dma->dma_tx_completion); 317 } 318 319 static void omap2_mcspi_tx_dma(struct spi_device *spi, 320 struct spi_transfer *xfer, 321 struct dma_slave_config cfg) 322 { 323 struct omap2_mcspi *mcspi; 324 struct omap2_mcspi_dma *mcspi_dma; 325 unsigned int count; 326 327 mcspi = spi_master_get_devdata(spi->master); 328 mcspi_dma = &mcspi->dma_channels[spi->chip_select]; 329 count = xfer->len; 330 331 if (mcspi_dma->dma_tx) { 332 struct dma_async_tx_descriptor *tx; 333 struct scatterlist sg; 334 335 dmaengine_slave_config(mcspi_dma->dma_tx, &cfg); 336 337 sg_init_table(&sg, 1); 338 sg_dma_address(&sg) = xfer->tx_dma; 339 sg_dma_len(&sg) = xfer->len; 340 341 tx = dmaengine_prep_slave_sg(mcspi_dma->dma_tx, &sg, 1, 342 DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 343 if (tx) { 344 tx->callback = omap2_mcspi_tx_callback; 345 tx->callback_param = spi; 346 dmaengine_submit(tx); 347 } else { 348 /* FIXME: fall back to PIO? */ 349 } 350 } 351 dma_async_issue_pending(mcspi_dma->dma_tx); 352 omap2_mcspi_set_dma_req(spi, 0, 1); 353 354 } 355 356 static unsigned 357 omap2_mcspi_rx_dma(struct spi_device *spi, struct spi_transfer *xfer, 358 struct dma_slave_config cfg, 359 unsigned es) 360 { 361 struct omap2_mcspi *mcspi; 362 struct omap2_mcspi_dma *mcspi_dma; 363 unsigned int count; 364 u32 l; 365 int elements = 0; 366 int word_len, element_count; 367 struct omap2_mcspi_cs *cs = spi->controller_state; 368 mcspi = spi_master_get_devdata(spi->master); 369 mcspi_dma = &mcspi->dma_channels[spi->chip_select]; 370 count = xfer->len; 371 word_len = cs->word_len; 372 l = mcspi_cached_chconf0(spi); 373 374 if (word_len <= 8) 375 element_count = count; 376 else if (word_len <= 16) 377 element_count = count >> 1; 378 else /* word_len <= 32 */ 379 element_count = count >> 2; 380 381 if (mcspi_dma->dma_rx) { 382 struct dma_async_tx_descriptor *tx; 383 struct scatterlist sg; 384 size_t len = xfer->len - es; 385 386 dmaengine_slave_config(mcspi_dma->dma_rx, &cfg); 387 388 if (l & OMAP2_MCSPI_CHCONF_TURBO) 389 len -= es; 390 391 sg_init_table(&sg, 1); 392 sg_dma_address(&sg) = xfer->rx_dma; 393 sg_dma_len(&sg) = len; 394 395 tx = dmaengine_prep_slave_sg(mcspi_dma->dma_rx, &sg, 1, 396 DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | 397 DMA_CTRL_ACK); 398 if (tx) { 399 tx->callback = omap2_mcspi_rx_callback; 400 tx->callback_param = spi; 401 dmaengine_submit(tx); 402 } else { 403 /* FIXME: fall back to PIO? */ 404 } 405 } 406 407 dma_async_issue_pending(mcspi_dma->dma_rx); 408 omap2_mcspi_set_dma_req(spi, 1, 1); 409 410 wait_for_completion(&mcspi_dma->dma_rx_completion); 411 dma_unmap_single(mcspi->dev, xfer->rx_dma, count, 412 DMA_FROM_DEVICE); 413 omap2_mcspi_set_enable(spi, 0); 414 415 elements = element_count - 1; 416 417 if (l & OMAP2_MCSPI_CHCONF_TURBO) { 418 elements--; 419 420 if (likely(mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHSTAT0) 421 & OMAP2_MCSPI_CHSTAT_RXS)) { 422 u32 w; 423 424 w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0); 425 if (word_len <= 8) 426 ((u8 *)xfer->rx_buf)[elements++] = w; 427 else if (word_len <= 16) 428 ((u16 *)xfer->rx_buf)[elements++] = w; 429 else /* word_len <= 32 */ 430 ((u32 *)xfer->rx_buf)[elements++] = w; 431 } else { 432 dev_err(&spi->dev, "DMA RX penultimate word empty"); 433 count -= (word_len <= 8) ? 2 : 434 (word_len <= 16) ? 4 : 435 /* word_len <= 32 */ 8; 436 omap2_mcspi_set_enable(spi, 1); 437 return count; 438 } 439 } 440 if (likely(mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHSTAT0) 441 & OMAP2_MCSPI_CHSTAT_RXS)) { 442 u32 w; 443 444 w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0); 445 if (word_len <= 8) 446 ((u8 *)xfer->rx_buf)[elements] = w; 447 else if (word_len <= 16) 448 ((u16 *)xfer->rx_buf)[elements] = w; 449 else /* word_len <= 32 */ 450 ((u32 *)xfer->rx_buf)[elements] = w; 451 } else { 452 dev_err(&spi->dev, "DMA RX last word empty"); 453 count -= (word_len <= 8) ? 1 : 454 (word_len <= 16) ? 2 : 455 /* word_len <= 32 */ 4; 456 } 457 omap2_mcspi_set_enable(spi, 1); 458 return count; 459 } 460 461 static unsigned 462 omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer) 463 { 464 struct omap2_mcspi *mcspi; 465 struct omap2_mcspi_cs *cs = spi->controller_state; 466 struct omap2_mcspi_dma *mcspi_dma; 467 unsigned int count; 468 u32 l; 469 u8 *rx; 470 const u8 *tx; 471 struct dma_slave_config cfg; 472 enum dma_slave_buswidth width; 473 unsigned es; 474 void __iomem *chstat_reg; 475 476 mcspi = spi_master_get_devdata(spi->master); 477 mcspi_dma = &mcspi->dma_channels[spi->chip_select]; 478 l = mcspi_cached_chconf0(spi); 479 480 481 if (cs->word_len <= 8) { 482 width = DMA_SLAVE_BUSWIDTH_1_BYTE; 483 es = 1; 484 } else if (cs->word_len <= 16) { 485 width = DMA_SLAVE_BUSWIDTH_2_BYTES; 486 es = 2; 487 } else { 488 width = DMA_SLAVE_BUSWIDTH_4_BYTES; 489 es = 4; 490 } 491 492 memset(&cfg, 0, sizeof(cfg)); 493 cfg.src_addr = cs->phys + OMAP2_MCSPI_RX0; 494 cfg.dst_addr = cs->phys + OMAP2_MCSPI_TX0; 495 cfg.src_addr_width = width; 496 cfg.dst_addr_width = width; 497 cfg.src_maxburst = 1; 498 cfg.dst_maxburst = 1; 499 500 rx = xfer->rx_buf; 501 tx = xfer->tx_buf; 502 503 count = xfer->len; 504 505 if (tx != NULL) 506 omap2_mcspi_tx_dma(spi, xfer, cfg); 507 508 if (rx != NULL) 509 count = omap2_mcspi_rx_dma(spi, xfer, cfg, es); 510 511 if (tx != NULL) { 512 chstat_reg = cs->base + OMAP2_MCSPI_CHSTAT0; 513 wait_for_completion(&mcspi_dma->dma_tx_completion); 514 dma_unmap_single(mcspi->dev, xfer->tx_dma, xfer->len, 515 DMA_TO_DEVICE); 516 517 /* for TX_ONLY mode, be sure all words have shifted out */ 518 if (rx == NULL) { 519 if (mcspi_wait_for_reg_bit(chstat_reg, 520 OMAP2_MCSPI_CHSTAT_TXS) < 0) 521 dev_err(&spi->dev, "TXS timed out\n"); 522 else if (mcspi_wait_for_reg_bit(chstat_reg, 523 OMAP2_MCSPI_CHSTAT_EOT) < 0) 524 dev_err(&spi->dev, "EOT timed out\n"); 525 } 526 } 527 return count; 528 } 529 530 static unsigned 531 omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer) 532 { 533 struct omap2_mcspi *mcspi; 534 struct omap2_mcspi_cs *cs = spi->controller_state; 535 unsigned int count, c; 536 u32 l; 537 void __iomem *base = cs->base; 538 void __iomem *tx_reg; 539 void __iomem *rx_reg; 540 void __iomem *chstat_reg; 541 int word_len; 542 543 mcspi = spi_master_get_devdata(spi->master); 544 count = xfer->len; 545 c = count; 546 word_len = cs->word_len; 547 548 l = mcspi_cached_chconf0(spi); 549 550 /* We store the pre-calculated register addresses on stack to speed 551 * up the transfer loop. */ 552 tx_reg = base + OMAP2_MCSPI_TX0; 553 rx_reg = base + OMAP2_MCSPI_RX0; 554 chstat_reg = base + OMAP2_MCSPI_CHSTAT0; 555 556 if (c < (word_len>>3)) 557 return 0; 558 559 if (word_len <= 8) { 560 u8 *rx; 561 const u8 *tx; 562 563 rx = xfer->rx_buf; 564 tx = xfer->tx_buf; 565 566 do { 567 c -= 1; 568 if (tx != NULL) { 569 if (mcspi_wait_for_reg_bit(chstat_reg, 570 OMAP2_MCSPI_CHSTAT_TXS) < 0) { 571 dev_err(&spi->dev, "TXS timed out\n"); 572 goto out; 573 } 574 dev_vdbg(&spi->dev, "write-%d %02x\n", 575 word_len, *tx); 576 __raw_writel(*tx++, tx_reg); 577 } 578 if (rx != NULL) { 579 if (mcspi_wait_for_reg_bit(chstat_reg, 580 OMAP2_MCSPI_CHSTAT_RXS) < 0) { 581 dev_err(&spi->dev, "RXS timed out\n"); 582 goto out; 583 } 584 585 if (c == 1 && tx == NULL && 586 (l & OMAP2_MCSPI_CHCONF_TURBO)) { 587 omap2_mcspi_set_enable(spi, 0); 588 *rx++ = __raw_readl(rx_reg); 589 dev_vdbg(&spi->dev, "read-%d %02x\n", 590 word_len, *(rx - 1)); 591 if (mcspi_wait_for_reg_bit(chstat_reg, 592 OMAP2_MCSPI_CHSTAT_RXS) < 0) { 593 dev_err(&spi->dev, 594 "RXS timed out\n"); 595 goto out; 596 } 597 c = 0; 598 } else if (c == 0 && tx == NULL) { 599 omap2_mcspi_set_enable(spi, 0); 600 } 601 602 *rx++ = __raw_readl(rx_reg); 603 dev_vdbg(&spi->dev, "read-%d %02x\n", 604 word_len, *(rx - 1)); 605 } 606 } while (c); 607 } else if (word_len <= 16) { 608 u16 *rx; 609 const u16 *tx; 610 611 rx = xfer->rx_buf; 612 tx = xfer->tx_buf; 613 do { 614 c -= 2; 615 if (tx != NULL) { 616 if (mcspi_wait_for_reg_bit(chstat_reg, 617 OMAP2_MCSPI_CHSTAT_TXS) < 0) { 618 dev_err(&spi->dev, "TXS timed out\n"); 619 goto out; 620 } 621 dev_vdbg(&spi->dev, "write-%d %04x\n", 622 word_len, *tx); 623 __raw_writel(*tx++, tx_reg); 624 } 625 if (rx != NULL) { 626 if (mcspi_wait_for_reg_bit(chstat_reg, 627 OMAP2_MCSPI_CHSTAT_RXS) < 0) { 628 dev_err(&spi->dev, "RXS timed out\n"); 629 goto out; 630 } 631 632 if (c == 2 && tx == NULL && 633 (l & OMAP2_MCSPI_CHCONF_TURBO)) { 634 omap2_mcspi_set_enable(spi, 0); 635 *rx++ = __raw_readl(rx_reg); 636 dev_vdbg(&spi->dev, "read-%d %04x\n", 637 word_len, *(rx - 1)); 638 if (mcspi_wait_for_reg_bit(chstat_reg, 639 OMAP2_MCSPI_CHSTAT_RXS) < 0) { 640 dev_err(&spi->dev, 641 "RXS timed out\n"); 642 goto out; 643 } 644 c = 0; 645 } else if (c == 0 && tx == NULL) { 646 omap2_mcspi_set_enable(spi, 0); 647 } 648 649 *rx++ = __raw_readl(rx_reg); 650 dev_vdbg(&spi->dev, "read-%d %04x\n", 651 word_len, *(rx - 1)); 652 } 653 } while (c >= 2); 654 } else if (word_len <= 32) { 655 u32 *rx; 656 const u32 *tx; 657 658 rx = xfer->rx_buf; 659 tx = xfer->tx_buf; 660 do { 661 c -= 4; 662 if (tx != NULL) { 663 if (mcspi_wait_for_reg_bit(chstat_reg, 664 OMAP2_MCSPI_CHSTAT_TXS) < 0) { 665 dev_err(&spi->dev, "TXS timed out\n"); 666 goto out; 667 } 668 dev_vdbg(&spi->dev, "write-%d %08x\n", 669 word_len, *tx); 670 __raw_writel(*tx++, tx_reg); 671 } 672 if (rx != NULL) { 673 if (mcspi_wait_for_reg_bit(chstat_reg, 674 OMAP2_MCSPI_CHSTAT_RXS) < 0) { 675 dev_err(&spi->dev, "RXS timed out\n"); 676 goto out; 677 } 678 679 if (c == 4 && tx == NULL && 680 (l & OMAP2_MCSPI_CHCONF_TURBO)) { 681 omap2_mcspi_set_enable(spi, 0); 682 *rx++ = __raw_readl(rx_reg); 683 dev_vdbg(&spi->dev, "read-%d %08x\n", 684 word_len, *(rx - 1)); 685 if (mcspi_wait_for_reg_bit(chstat_reg, 686 OMAP2_MCSPI_CHSTAT_RXS) < 0) { 687 dev_err(&spi->dev, 688 "RXS timed out\n"); 689 goto out; 690 } 691 c = 0; 692 } else if (c == 0 && tx == NULL) { 693 omap2_mcspi_set_enable(spi, 0); 694 } 695 696 *rx++ = __raw_readl(rx_reg); 697 dev_vdbg(&spi->dev, "read-%d %08x\n", 698 word_len, *(rx - 1)); 699 } 700 } while (c >= 4); 701 } 702 703 /* for TX_ONLY mode, be sure all words have shifted out */ 704 if (xfer->rx_buf == NULL) { 705 if (mcspi_wait_for_reg_bit(chstat_reg, 706 OMAP2_MCSPI_CHSTAT_TXS) < 0) { 707 dev_err(&spi->dev, "TXS timed out\n"); 708 } else if (mcspi_wait_for_reg_bit(chstat_reg, 709 OMAP2_MCSPI_CHSTAT_EOT) < 0) 710 dev_err(&spi->dev, "EOT timed out\n"); 711 712 /* disable chan to purge rx datas received in TX_ONLY transfer, 713 * otherwise these rx datas will affect the direct following 714 * RX_ONLY transfer. 715 */ 716 omap2_mcspi_set_enable(spi, 0); 717 } 718 out: 719 omap2_mcspi_set_enable(spi, 1); 720 return count - c; 721 } 722 723 static u32 omap2_mcspi_calc_divisor(u32 speed_hz) 724 { 725 u32 div; 726 727 for (div = 0; div < 15; div++) 728 if (speed_hz >= (OMAP2_MCSPI_MAX_FREQ >> div)) 729 return div; 730 731 return 15; 732 } 733 734 /* called only when no transfer is active to this device */ 735 static int omap2_mcspi_setup_transfer(struct spi_device *spi, 736 struct spi_transfer *t) 737 { 738 struct omap2_mcspi_cs *cs = spi->controller_state; 739 struct omap2_mcspi *mcspi; 740 struct spi_master *spi_cntrl; 741 u32 l = 0, div = 0; 742 u8 word_len = spi->bits_per_word; 743 u32 speed_hz = spi->max_speed_hz; 744 745 mcspi = spi_master_get_devdata(spi->master); 746 spi_cntrl = mcspi->master; 747 748 if (t != NULL && t->bits_per_word) 749 word_len = t->bits_per_word; 750 751 cs->word_len = word_len; 752 753 if (t && t->speed_hz) 754 speed_hz = t->speed_hz; 755 756 speed_hz = min_t(u32, speed_hz, OMAP2_MCSPI_MAX_FREQ); 757 div = omap2_mcspi_calc_divisor(speed_hz); 758 759 l = mcspi_cached_chconf0(spi); 760 761 /* standard 4-wire master mode: SCK, MOSI/out, MISO/in, nCS 762 * REVISIT: this controller could support SPI_3WIRE mode. 763 */ 764 if (mcspi->pin_dir == MCSPI_PINDIR_D0_IN_D1_OUT) { 765 l &= ~OMAP2_MCSPI_CHCONF_IS; 766 l &= ~OMAP2_MCSPI_CHCONF_DPE1; 767 l |= OMAP2_MCSPI_CHCONF_DPE0; 768 } else { 769 l |= OMAP2_MCSPI_CHCONF_IS; 770 l |= OMAP2_MCSPI_CHCONF_DPE1; 771 l &= ~OMAP2_MCSPI_CHCONF_DPE0; 772 } 773 774 /* wordlength */ 775 l &= ~OMAP2_MCSPI_CHCONF_WL_MASK; 776 l |= (word_len - 1) << 7; 777 778 /* set chipselect polarity; manage with FORCE */ 779 if (!(spi->mode & SPI_CS_HIGH)) 780 l |= OMAP2_MCSPI_CHCONF_EPOL; /* active-low; normal */ 781 else 782 l &= ~OMAP2_MCSPI_CHCONF_EPOL; 783 784 /* set clock divisor */ 785 l &= ~OMAP2_MCSPI_CHCONF_CLKD_MASK; 786 l |= div << 2; 787 788 /* set SPI mode 0..3 */ 789 if (spi->mode & SPI_CPOL) 790 l |= OMAP2_MCSPI_CHCONF_POL; 791 else 792 l &= ~OMAP2_MCSPI_CHCONF_POL; 793 if (spi->mode & SPI_CPHA) 794 l |= OMAP2_MCSPI_CHCONF_PHA; 795 else 796 l &= ~OMAP2_MCSPI_CHCONF_PHA; 797 798 mcspi_write_chconf0(spi, l); 799 800 dev_dbg(&spi->dev, "setup: speed %d, sample %s edge, clk %s\n", 801 OMAP2_MCSPI_MAX_FREQ >> div, 802 (spi->mode & SPI_CPHA) ? "trailing" : "leading", 803 (spi->mode & SPI_CPOL) ? "inverted" : "normal"); 804 805 return 0; 806 } 807 808 static int omap2_mcspi_request_dma(struct spi_device *spi) 809 { 810 struct spi_master *master = spi->master; 811 struct omap2_mcspi *mcspi; 812 struct omap2_mcspi_dma *mcspi_dma; 813 dma_cap_mask_t mask; 814 unsigned sig; 815 816 mcspi = spi_master_get_devdata(master); 817 mcspi_dma = mcspi->dma_channels + spi->chip_select; 818 819 init_completion(&mcspi_dma->dma_rx_completion); 820 init_completion(&mcspi_dma->dma_tx_completion); 821 822 dma_cap_zero(mask); 823 dma_cap_set(DMA_SLAVE, mask); 824 sig = mcspi_dma->dma_rx_sync_dev; 825 mcspi_dma->dma_rx = dma_request_channel(mask, omap_dma_filter_fn, &sig); 826 if (!mcspi_dma->dma_rx) { 827 dev_err(&spi->dev, "no RX DMA engine channel for McSPI\n"); 828 return -EAGAIN; 829 } 830 831 sig = mcspi_dma->dma_tx_sync_dev; 832 mcspi_dma->dma_tx = dma_request_channel(mask, omap_dma_filter_fn, &sig); 833 if (!mcspi_dma->dma_tx) { 834 dev_err(&spi->dev, "no TX DMA engine channel for McSPI\n"); 835 dma_release_channel(mcspi_dma->dma_rx); 836 mcspi_dma->dma_rx = NULL; 837 return -EAGAIN; 838 } 839 840 return 0; 841 } 842 843 static int omap2_mcspi_setup(struct spi_device *spi) 844 { 845 int ret; 846 struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master); 847 struct omap2_mcspi_regs *ctx = &mcspi->ctx; 848 struct omap2_mcspi_dma *mcspi_dma; 849 struct omap2_mcspi_cs *cs = spi->controller_state; 850 851 if (spi->bits_per_word < 4 || spi->bits_per_word > 32) { 852 dev_dbg(&spi->dev, "setup: unsupported %d bit words\n", 853 spi->bits_per_word); 854 return -EINVAL; 855 } 856 857 mcspi_dma = &mcspi->dma_channels[spi->chip_select]; 858 859 if (!cs) { 860 cs = kzalloc(sizeof *cs, GFP_KERNEL); 861 if (!cs) 862 return -ENOMEM; 863 cs->base = mcspi->base + spi->chip_select * 0x14; 864 cs->phys = mcspi->phys + spi->chip_select * 0x14; 865 cs->chconf0 = 0; 866 spi->controller_state = cs; 867 /* Link this to context save list */ 868 list_add_tail(&cs->node, &ctx->cs); 869 } 870 871 if (!mcspi_dma->dma_rx || !mcspi_dma->dma_tx) { 872 ret = omap2_mcspi_request_dma(spi); 873 if (ret < 0) 874 return ret; 875 } 876 877 ret = pm_runtime_get_sync(mcspi->dev); 878 if (ret < 0) 879 return ret; 880 881 ret = omap2_mcspi_setup_transfer(spi, NULL); 882 pm_runtime_mark_last_busy(mcspi->dev); 883 pm_runtime_put_autosuspend(mcspi->dev); 884 885 return ret; 886 } 887 888 static void omap2_mcspi_cleanup(struct spi_device *spi) 889 { 890 struct omap2_mcspi *mcspi; 891 struct omap2_mcspi_dma *mcspi_dma; 892 struct omap2_mcspi_cs *cs; 893 894 mcspi = spi_master_get_devdata(spi->master); 895 896 if (spi->controller_state) { 897 /* Unlink controller state from context save list */ 898 cs = spi->controller_state; 899 list_del(&cs->node); 900 901 kfree(cs); 902 } 903 904 if (spi->chip_select < spi->master->num_chipselect) { 905 mcspi_dma = &mcspi->dma_channels[spi->chip_select]; 906 907 if (mcspi_dma->dma_rx) { 908 dma_release_channel(mcspi_dma->dma_rx); 909 mcspi_dma->dma_rx = NULL; 910 } 911 if (mcspi_dma->dma_tx) { 912 dma_release_channel(mcspi_dma->dma_tx); 913 mcspi_dma->dma_tx = NULL; 914 } 915 } 916 } 917 918 static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m) 919 { 920 921 /* We only enable one channel at a time -- the one whose message is 922 * -- although this controller would gladly 923 * arbitrate among multiple channels. This corresponds to "single 924 * channel" master mode. As a side effect, we need to manage the 925 * chipselect with the FORCE bit ... CS != channel enable. 926 */ 927 928 struct spi_device *spi; 929 struct spi_transfer *t = NULL; 930 struct spi_master *master; 931 int cs_active = 0; 932 struct omap2_mcspi_cs *cs; 933 struct omap2_mcspi_device_config *cd; 934 int par_override = 0; 935 int status = 0; 936 u32 chconf; 937 938 spi = m->spi; 939 master = spi->master; 940 cs = spi->controller_state; 941 cd = spi->controller_data; 942 943 omap2_mcspi_set_enable(spi, 1); 944 list_for_each_entry(t, &m->transfers, transfer_list) { 945 if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) { 946 status = -EINVAL; 947 break; 948 } 949 if (par_override || t->speed_hz || t->bits_per_word) { 950 par_override = 1; 951 status = omap2_mcspi_setup_transfer(spi, t); 952 if (status < 0) 953 break; 954 if (!t->speed_hz && !t->bits_per_word) 955 par_override = 0; 956 } 957 if (cd && cd->cs_per_word) { 958 chconf = mcspi->ctx.modulctrl; 959 chconf &= ~OMAP2_MCSPI_MODULCTRL_SINGLE; 960 mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, chconf); 961 mcspi->ctx.modulctrl = 962 mcspi_read_cs_reg(spi, OMAP2_MCSPI_MODULCTRL); 963 } 964 965 966 if (!cs_active) { 967 omap2_mcspi_force_cs(spi, 1); 968 cs_active = 1; 969 } 970 971 chconf = mcspi_cached_chconf0(spi); 972 chconf &= ~OMAP2_MCSPI_CHCONF_TRM_MASK; 973 chconf &= ~OMAP2_MCSPI_CHCONF_TURBO; 974 975 if (t->tx_buf == NULL) 976 chconf |= OMAP2_MCSPI_CHCONF_TRM_RX_ONLY; 977 else if (t->rx_buf == NULL) 978 chconf |= OMAP2_MCSPI_CHCONF_TRM_TX_ONLY; 979 980 if (cd && cd->turbo_mode && t->tx_buf == NULL) { 981 /* Turbo mode is for more than one word */ 982 if (t->len > ((cs->word_len + 7) >> 3)) 983 chconf |= OMAP2_MCSPI_CHCONF_TURBO; 984 } 985 986 mcspi_write_chconf0(spi, chconf); 987 988 if (t->len) { 989 unsigned count; 990 991 /* RX_ONLY mode needs dummy data in TX reg */ 992 if (t->tx_buf == NULL) 993 __raw_writel(0, cs->base 994 + OMAP2_MCSPI_TX0); 995 996 if (m->is_dma_mapped || t->len >= DMA_MIN_BYTES) 997 count = omap2_mcspi_txrx_dma(spi, t); 998 else 999 count = omap2_mcspi_txrx_pio(spi, t); 1000 m->actual_length += count; 1001 1002 if (count != t->len) { 1003 status = -EIO; 1004 break; 1005 } 1006 } 1007 1008 if (t->delay_usecs) 1009 udelay(t->delay_usecs); 1010 1011 /* ignore the "leave it on after last xfer" hint */ 1012 if (t->cs_change) { 1013 omap2_mcspi_force_cs(spi, 0); 1014 cs_active = 0; 1015 } 1016 } 1017 /* Restore defaults if they were overriden */ 1018 if (par_override) { 1019 par_override = 0; 1020 status = omap2_mcspi_setup_transfer(spi, NULL); 1021 } 1022 1023 if (cs_active) 1024 omap2_mcspi_force_cs(spi, 0); 1025 1026 if (cd && cd->cs_per_word) { 1027 chconf = mcspi->ctx.modulctrl; 1028 chconf |= OMAP2_MCSPI_MODULCTRL_SINGLE; 1029 mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, chconf); 1030 mcspi->ctx.modulctrl = 1031 mcspi_read_cs_reg(spi, OMAP2_MCSPI_MODULCTRL); 1032 } 1033 1034 omap2_mcspi_set_enable(spi, 0); 1035 1036 m->status = status; 1037 1038 } 1039 1040 static int omap2_mcspi_transfer_one_message(struct spi_master *master, 1041 struct spi_message *m) 1042 { 1043 struct omap2_mcspi *mcspi; 1044 struct spi_transfer *t; 1045 1046 mcspi = spi_master_get_devdata(master); 1047 m->actual_length = 0; 1048 m->status = 0; 1049 1050 /* reject invalid messages and transfers */ 1051 if (list_empty(&m->transfers)) 1052 return -EINVAL; 1053 list_for_each_entry(t, &m->transfers, transfer_list) { 1054 const void *tx_buf = t->tx_buf; 1055 void *rx_buf = t->rx_buf; 1056 unsigned len = t->len; 1057 1058 if (t->speed_hz > OMAP2_MCSPI_MAX_FREQ 1059 || (len && !(rx_buf || tx_buf)) 1060 || (t->bits_per_word && 1061 ( t->bits_per_word < 4 1062 || t->bits_per_word > 32))) { 1063 dev_dbg(mcspi->dev, "transfer: %d Hz, %d %s%s, %d bpw\n", 1064 t->speed_hz, 1065 len, 1066 tx_buf ? "tx" : "", 1067 rx_buf ? "rx" : "", 1068 t->bits_per_word); 1069 return -EINVAL; 1070 } 1071 if (t->speed_hz && t->speed_hz < (OMAP2_MCSPI_MAX_FREQ >> 15)) { 1072 dev_dbg(mcspi->dev, "speed_hz %d below minimum %d Hz\n", 1073 t->speed_hz, 1074 OMAP2_MCSPI_MAX_FREQ >> 15); 1075 return -EINVAL; 1076 } 1077 1078 if (m->is_dma_mapped || len < DMA_MIN_BYTES) 1079 continue; 1080 1081 if (tx_buf != NULL) { 1082 t->tx_dma = dma_map_single(mcspi->dev, (void *) tx_buf, 1083 len, DMA_TO_DEVICE); 1084 if (dma_mapping_error(mcspi->dev, t->tx_dma)) { 1085 dev_dbg(mcspi->dev, "dma %cX %d bytes error\n", 1086 'T', len); 1087 return -EINVAL; 1088 } 1089 } 1090 if (rx_buf != NULL) { 1091 t->rx_dma = dma_map_single(mcspi->dev, rx_buf, t->len, 1092 DMA_FROM_DEVICE); 1093 if (dma_mapping_error(mcspi->dev, t->rx_dma)) { 1094 dev_dbg(mcspi->dev, "dma %cX %d bytes error\n", 1095 'R', len); 1096 if (tx_buf != NULL) 1097 dma_unmap_single(mcspi->dev, t->tx_dma, 1098 len, DMA_TO_DEVICE); 1099 return -EINVAL; 1100 } 1101 } 1102 } 1103 1104 omap2_mcspi_work(mcspi, m); 1105 spi_finalize_current_message(master); 1106 return 0; 1107 } 1108 1109 static int omap2_mcspi_master_setup(struct omap2_mcspi *mcspi) 1110 { 1111 struct spi_master *master = mcspi->master; 1112 struct omap2_mcspi_regs *ctx = &mcspi->ctx; 1113 int ret = 0; 1114 1115 ret = pm_runtime_get_sync(mcspi->dev); 1116 if (ret < 0) 1117 return ret; 1118 1119 mcspi_write_reg(master, OMAP2_MCSPI_WAKEUPENABLE, 1120 OMAP2_MCSPI_WAKEUPENABLE_WKEN); 1121 ctx->wakeupenable = OMAP2_MCSPI_WAKEUPENABLE_WKEN; 1122 1123 omap2_mcspi_set_master_mode(master); 1124 pm_runtime_mark_last_busy(mcspi->dev); 1125 pm_runtime_put_autosuspend(mcspi->dev); 1126 return 0; 1127 } 1128 1129 static int omap_mcspi_runtime_resume(struct device *dev) 1130 { 1131 struct omap2_mcspi *mcspi; 1132 struct spi_master *master; 1133 1134 master = dev_get_drvdata(dev); 1135 mcspi = spi_master_get_devdata(master); 1136 omap2_mcspi_restore_ctx(mcspi); 1137 1138 return 0; 1139 } 1140 1141 static struct omap2_mcspi_platform_config omap2_pdata = { 1142 .regs_offset = 0, 1143 }; 1144 1145 static struct omap2_mcspi_platform_config omap4_pdata = { 1146 .regs_offset = OMAP4_MCSPI_REG_OFFSET, 1147 }; 1148 1149 static const struct of_device_id omap_mcspi_of_match[] = { 1150 { 1151 .compatible = "ti,omap2-mcspi", 1152 .data = &omap2_pdata, 1153 }, 1154 { 1155 .compatible = "ti,omap4-mcspi", 1156 .data = &omap4_pdata, 1157 }, 1158 { }, 1159 }; 1160 MODULE_DEVICE_TABLE(of, omap_mcspi_of_match); 1161 1162 static int omap2_mcspi_probe(struct platform_device *pdev) 1163 { 1164 struct spi_master *master; 1165 const struct omap2_mcspi_platform_config *pdata; 1166 struct omap2_mcspi *mcspi; 1167 struct resource *r; 1168 int status = 0, i; 1169 u32 regs_offset = 0; 1170 static int bus_num = 1; 1171 struct device_node *node = pdev->dev.of_node; 1172 const struct of_device_id *match; 1173 struct pinctrl *pinctrl; 1174 1175 master = spi_alloc_master(&pdev->dev, sizeof *mcspi); 1176 if (master == NULL) { 1177 dev_dbg(&pdev->dev, "master allocation failed\n"); 1178 return -ENOMEM; 1179 } 1180 1181 /* the spi->mode bits understood by this driver: */ 1182 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; 1183 1184 master->setup = omap2_mcspi_setup; 1185 master->prepare_transfer_hardware = omap2_prepare_transfer; 1186 master->unprepare_transfer_hardware = omap2_unprepare_transfer; 1187 master->transfer_one_message = omap2_mcspi_transfer_one_message; 1188 master->cleanup = omap2_mcspi_cleanup; 1189 master->dev.of_node = node; 1190 1191 dev_set_drvdata(&pdev->dev, master); 1192 1193 mcspi = spi_master_get_devdata(master); 1194 mcspi->master = master; 1195 1196 match = of_match_device(omap_mcspi_of_match, &pdev->dev); 1197 if (match) { 1198 u32 num_cs = 1; /* default number of chipselect */ 1199 pdata = match->data; 1200 1201 of_property_read_u32(node, "ti,spi-num-cs", &num_cs); 1202 master->num_chipselect = num_cs; 1203 master->bus_num = bus_num++; 1204 if (of_get_property(node, "ti,pindir-d0-out-d1-in", NULL)) 1205 mcspi->pin_dir = MCSPI_PINDIR_D0_OUT_D1_IN; 1206 } else { 1207 pdata = pdev->dev.platform_data; 1208 master->num_chipselect = pdata->num_cs; 1209 if (pdev->id != -1) 1210 master->bus_num = pdev->id; 1211 mcspi->pin_dir = pdata->pin_dir; 1212 } 1213 regs_offset = pdata->regs_offset; 1214 1215 r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1216 if (r == NULL) { 1217 status = -ENODEV; 1218 goto free_master; 1219 } 1220 1221 r->start += regs_offset; 1222 r->end += regs_offset; 1223 mcspi->phys = r->start; 1224 1225 mcspi->base = devm_request_and_ioremap(&pdev->dev, r); 1226 if (!mcspi->base) { 1227 dev_dbg(&pdev->dev, "can't ioremap MCSPI\n"); 1228 status = -ENOMEM; 1229 goto free_master; 1230 } 1231 1232 mcspi->dev = &pdev->dev; 1233 1234 INIT_LIST_HEAD(&mcspi->ctx.cs); 1235 1236 mcspi->dma_channels = kcalloc(master->num_chipselect, 1237 sizeof(struct omap2_mcspi_dma), 1238 GFP_KERNEL); 1239 1240 if (mcspi->dma_channels == NULL) 1241 goto free_master; 1242 1243 for (i = 0; i < master->num_chipselect; i++) { 1244 char dma_ch_name[14]; 1245 struct resource *dma_res; 1246 1247 sprintf(dma_ch_name, "rx%d", i); 1248 dma_res = platform_get_resource_byname(pdev, IORESOURCE_DMA, 1249 dma_ch_name); 1250 if (!dma_res) { 1251 dev_dbg(&pdev->dev, "cannot get DMA RX channel\n"); 1252 status = -ENODEV; 1253 break; 1254 } 1255 1256 mcspi->dma_channels[i].dma_rx_sync_dev = dma_res->start; 1257 sprintf(dma_ch_name, "tx%d", i); 1258 dma_res = platform_get_resource_byname(pdev, IORESOURCE_DMA, 1259 dma_ch_name); 1260 if (!dma_res) { 1261 dev_dbg(&pdev->dev, "cannot get DMA TX channel\n"); 1262 status = -ENODEV; 1263 break; 1264 } 1265 1266 mcspi->dma_channels[i].dma_tx_sync_dev = dma_res->start; 1267 } 1268 1269 if (status < 0) 1270 goto dma_chnl_free; 1271 1272 pinctrl = devm_pinctrl_get_select_default(&pdev->dev); 1273 if (IS_ERR(pinctrl)) 1274 dev_warn(&pdev->dev, 1275 "pins are not configured from the driver\n"); 1276 1277 pm_runtime_use_autosuspend(&pdev->dev); 1278 pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT); 1279 pm_runtime_enable(&pdev->dev); 1280 1281 if (status || omap2_mcspi_master_setup(mcspi) < 0) 1282 goto disable_pm; 1283 1284 status = spi_register_master(master); 1285 if (status < 0) 1286 goto disable_pm; 1287 1288 return status; 1289 1290 disable_pm: 1291 pm_runtime_disable(&pdev->dev); 1292 dma_chnl_free: 1293 kfree(mcspi->dma_channels); 1294 free_master: 1295 spi_master_put(master); 1296 return status; 1297 } 1298 1299 static int omap2_mcspi_remove(struct platform_device *pdev) 1300 { 1301 struct spi_master *master; 1302 struct omap2_mcspi *mcspi; 1303 struct omap2_mcspi_dma *dma_channels; 1304 1305 master = dev_get_drvdata(&pdev->dev); 1306 mcspi = spi_master_get_devdata(master); 1307 dma_channels = mcspi->dma_channels; 1308 1309 pm_runtime_put_sync(mcspi->dev); 1310 pm_runtime_disable(&pdev->dev); 1311 1312 spi_unregister_master(master); 1313 kfree(dma_channels); 1314 1315 return 0; 1316 } 1317 1318 /* work with hotplug and coldplug */ 1319 MODULE_ALIAS("platform:omap2_mcspi"); 1320 1321 #ifdef CONFIG_SUSPEND 1322 /* 1323 * When SPI wake up from off-mode, CS is in activate state. If it was in 1324 * unactive state when driver was suspend, then force it to unactive state at 1325 * wake up. 1326 */ 1327 static int omap2_mcspi_resume(struct device *dev) 1328 { 1329 struct spi_master *master = dev_get_drvdata(dev); 1330 struct omap2_mcspi *mcspi = spi_master_get_devdata(master); 1331 struct omap2_mcspi_regs *ctx = &mcspi->ctx; 1332 struct omap2_mcspi_cs *cs; 1333 1334 pm_runtime_get_sync(mcspi->dev); 1335 list_for_each_entry(cs, &ctx->cs, node) { 1336 if ((cs->chconf0 & OMAP2_MCSPI_CHCONF_FORCE) == 0) { 1337 /* 1338 * We need to toggle CS state for OMAP take this 1339 * change in account. 1340 */ 1341 cs->chconf0 |= OMAP2_MCSPI_CHCONF_FORCE; 1342 __raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0); 1343 cs->chconf0 &= ~OMAP2_MCSPI_CHCONF_FORCE; 1344 __raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0); 1345 } 1346 } 1347 pm_runtime_mark_last_busy(mcspi->dev); 1348 pm_runtime_put_autosuspend(mcspi->dev); 1349 return 0; 1350 } 1351 #else 1352 #define omap2_mcspi_resume NULL 1353 #endif 1354 1355 static const struct dev_pm_ops omap2_mcspi_pm_ops = { 1356 .resume = omap2_mcspi_resume, 1357 .runtime_resume = omap_mcspi_runtime_resume, 1358 }; 1359 1360 static struct platform_driver omap2_mcspi_driver = { 1361 .driver = { 1362 .name = "omap2_mcspi", 1363 .owner = THIS_MODULE, 1364 .pm = &omap2_mcspi_pm_ops, 1365 .of_match_table = omap_mcspi_of_match, 1366 }, 1367 .probe = omap2_mcspi_probe, 1368 .remove = omap2_mcspi_remove, 1369 }; 1370 1371 module_platform_driver(omap2_mcspi_driver); 1372 MODULE_LICENSE("GPL"); 1373