1 /* 2 * Freescale eSPI controller driver. 3 * 4 * Copyright 2010 Freescale Semiconductor, Inc. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation; either version 2 of the License, or (at your 9 * option) any later version. 10 */ 11 #include <linux/delay.h> 12 #include <linux/err.h> 13 #include <linux/fsl_devices.h> 14 #include <linux/interrupt.h> 15 #include <linux/irq.h> 16 #include <linux/module.h> 17 #include <linux/mm.h> 18 #include <linux/of.h> 19 #include <linux/of_address.h> 20 #include <linux/of_irq.h> 21 #include <linux/of_platform.h> 22 #include <linux/platform_device.h> 23 #include <linux/spi/spi.h> 24 #include <sysdev/fsl_soc.h> 25 26 #include "spi-fsl-lib.h" 27 28 /* eSPI Controller registers */ 29 struct fsl_espi_reg { 30 __be32 mode; /* 0x000 - eSPI mode register */ 31 __be32 event; /* 0x004 - eSPI event register */ 32 __be32 mask; /* 0x008 - eSPI mask register */ 33 __be32 command; /* 0x00c - eSPI command register */ 34 __be32 transmit; /* 0x010 - eSPI transmit FIFO access register*/ 35 __be32 receive; /* 0x014 - eSPI receive FIFO access register*/ 36 u8 res[8]; /* 0x018 - 0x01c reserved */ 37 __be32 csmode[4]; /* 0x020 - 0x02c eSPI cs mode register */ 38 }; 39 40 struct fsl_espi_transfer { 41 const void *tx_buf; 42 void *rx_buf; 43 unsigned len; 44 unsigned n_tx; 45 unsigned n_rx; 46 unsigned actual_length; 47 int status; 48 }; 49 50 /* eSPI Controller mode register definitions */ 51 #define SPMODE_ENABLE (1 << 31) 52 #define SPMODE_LOOP (1 << 30) 53 #define SPMODE_TXTHR(x) ((x) << 8) 54 #define SPMODE_RXTHR(x) ((x) << 0) 55 56 /* eSPI Controller CS mode register definitions */ 57 #define CSMODE_CI_INACTIVEHIGH (1 << 31) 58 #define CSMODE_CP_BEGIN_EDGECLK (1 << 30) 59 #define CSMODE_REV (1 << 29) 60 #define CSMODE_DIV16 (1 << 28) 61 #define CSMODE_PM(x) ((x) << 24) 62 #define CSMODE_POL_1 (1 << 20) 63 #define CSMODE_LEN(x) ((x) << 16) 64 #define CSMODE_BEF(x) ((x) << 12) 65 #define CSMODE_AFT(x) ((x) << 8) 66 #define CSMODE_CG(x) ((x) << 3) 67 68 /* Default mode/csmode for eSPI controller */ 69 #define SPMODE_INIT_VAL (SPMODE_TXTHR(4) | SPMODE_RXTHR(3)) 70 #define CSMODE_INIT_VAL (CSMODE_POL_1 | CSMODE_BEF(0) \ 71 | CSMODE_AFT(0) | CSMODE_CG(1)) 72 73 /* SPIE register values */ 74 #define SPIE_NE 0x00000200 /* Not empty */ 75 #define SPIE_NF 0x00000100 /* Not full */ 76 77 /* SPIM register values */ 78 #define SPIM_NE 0x00000200 /* Not empty */ 79 #define SPIM_NF 0x00000100 /* Not full */ 80 #define SPIE_RXCNT(reg) ((reg >> 24) & 0x3F) 81 #define SPIE_TXCNT(reg) ((reg >> 16) & 0x3F) 82 83 /* SPCOM register values */ 84 #define SPCOM_CS(x) ((x) << 30) 85 #define SPCOM_TRANLEN(x) ((x) << 0) 86 #define SPCOM_TRANLEN_MAX 0xFFFF /* Max transaction length */ 87 88 static void fsl_espi_change_mode(struct spi_device *spi) 89 { 90 struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master); 91 struct spi_mpc8xxx_cs *cs = spi->controller_state; 92 struct fsl_espi_reg *reg_base = mspi->reg_base; 93 __be32 __iomem *mode = ®_base->csmode[spi->chip_select]; 94 __be32 __iomem *espi_mode = ®_base->mode; 95 u32 tmp; 96 unsigned long flags; 97 98 /* Turn off IRQs locally to minimize time that SPI is disabled. */ 99 local_irq_save(flags); 100 101 /* Turn off SPI unit prior changing mode */ 102 tmp = mpc8xxx_spi_read_reg(espi_mode); 103 mpc8xxx_spi_write_reg(espi_mode, tmp & ~SPMODE_ENABLE); 104 mpc8xxx_spi_write_reg(mode, cs->hw_mode); 105 mpc8xxx_spi_write_reg(espi_mode, tmp); 106 107 local_irq_restore(flags); 108 } 109 110 static u32 fsl_espi_tx_buf_lsb(struct mpc8xxx_spi *mpc8xxx_spi) 111 { 112 u32 data; 113 u16 data_h; 114 u16 data_l; 115 const u32 *tx = mpc8xxx_spi->tx; 116 117 if (!tx) 118 return 0; 119 120 data = *tx++ << mpc8xxx_spi->tx_shift; 121 data_l = data & 0xffff; 122 data_h = (data >> 16) & 0xffff; 123 swab16s(&data_l); 124 swab16s(&data_h); 125 data = data_h | data_l; 126 127 mpc8xxx_spi->tx = tx; 128 return data; 129 } 130 131 static int fsl_espi_setup_transfer(struct spi_device *spi, 132 struct spi_transfer *t) 133 { 134 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); 135 int bits_per_word = 0; 136 u8 pm; 137 u32 hz = 0; 138 struct spi_mpc8xxx_cs *cs = spi->controller_state; 139 140 if (t) { 141 bits_per_word = t->bits_per_word; 142 hz = t->speed_hz; 143 } 144 145 /* spi_transfer level calls that work per-word */ 146 if (!bits_per_word) 147 bits_per_word = spi->bits_per_word; 148 149 if (!hz) 150 hz = spi->max_speed_hz; 151 152 cs->rx_shift = 0; 153 cs->tx_shift = 0; 154 cs->get_rx = mpc8xxx_spi_rx_buf_u32; 155 cs->get_tx = mpc8xxx_spi_tx_buf_u32; 156 if (bits_per_word <= 8) { 157 cs->rx_shift = 8 - bits_per_word; 158 } else { 159 cs->rx_shift = 16 - bits_per_word; 160 if (spi->mode & SPI_LSB_FIRST) 161 cs->get_tx = fsl_espi_tx_buf_lsb; 162 } 163 164 mpc8xxx_spi->rx_shift = cs->rx_shift; 165 mpc8xxx_spi->tx_shift = cs->tx_shift; 166 mpc8xxx_spi->get_rx = cs->get_rx; 167 mpc8xxx_spi->get_tx = cs->get_tx; 168 169 bits_per_word = bits_per_word - 1; 170 171 /* mask out bits we are going to set */ 172 cs->hw_mode &= ~(CSMODE_LEN(0xF) | CSMODE_DIV16 | CSMODE_PM(0xF)); 173 174 cs->hw_mode |= CSMODE_LEN(bits_per_word); 175 176 if ((mpc8xxx_spi->spibrg / hz) > 64) { 177 cs->hw_mode |= CSMODE_DIV16; 178 pm = DIV_ROUND_UP(mpc8xxx_spi->spibrg, hz * 16 * 4); 179 180 WARN_ONCE(pm > 33, "%s: Requested speed is too low: %d Hz. " 181 "Will use %d Hz instead.\n", dev_name(&spi->dev), 182 hz, mpc8xxx_spi->spibrg / (4 * 16 * (32 + 1))); 183 if (pm > 33) 184 pm = 33; 185 } else { 186 pm = DIV_ROUND_UP(mpc8xxx_spi->spibrg, hz * 4); 187 } 188 if (pm) 189 pm--; 190 if (pm < 2) 191 pm = 2; 192 193 cs->hw_mode |= CSMODE_PM(pm); 194 195 fsl_espi_change_mode(spi); 196 return 0; 197 } 198 199 static int fsl_espi_cpu_bufs(struct mpc8xxx_spi *mspi, struct spi_transfer *t, 200 unsigned int len) 201 { 202 u32 word; 203 struct fsl_espi_reg *reg_base = mspi->reg_base; 204 205 mspi->count = len; 206 207 /* enable rx ints */ 208 mpc8xxx_spi_write_reg(®_base->mask, SPIM_NE); 209 210 /* transmit word */ 211 word = mspi->get_tx(mspi); 212 mpc8xxx_spi_write_reg(®_base->transmit, word); 213 214 return 0; 215 } 216 217 static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t) 218 { 219 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); 220 struct fsl_espi_reg *reg_base = mpc8xxx_spi->reg_base; 221 unsigned int len = t->len; 222 int ret; 223 224 mpc8xxx_spi->len = t->len; 225 len = roundup(len, 4) / 4; 226 227 mpc8xxx_spi->tx = t->tx_buf; 228 mpc8xxx_spi->rx = t->rx_buf; 229 230 reinit_completion(&mpc8xxx_spi->done); 231 232 /* Set SPCOM[CS] and SPCOM[TRANLEN] field */ 233 if ((t->len - 1) > SPCOM_TRANLEN_MAX) { 234 dev_err(mpc8xxx_spi->dev, "Transaction length (%d)" 235 " beyond the SPCOM[TRANLEN] field\n", t->len); 236 return -EINVAL; 237 } 238 mpc8xxx_spi_write_reg(®_base->command, 239 (SPCOM_CS(spi->chip_select) | SPCOM_TRANLEN(t->len - 1))); 240 241 ret = fsl_espi_cpu_bufs(mpc8xxx_spi, t, len); 242 if (ret) 243 return ret; 244 245 wait_for_completion(&mpc8xxx_spi->done); 246 247 /* disable rx ints */ 248 mpc8xxx_spi_write_reg(®_base->mask, 0); 249 250 return mpc8xxx_spi->count; 251 } 252 253 static inline void fsl_espi_addr2cmd(unsigned int addr, u8 *cmd) 254 { 255 if (cmd) { 256 cmd[1] = (u8)(addr >> 16); 257 cmd[2] = (u8)(addr >> 8); 258 cmd[3] = (u8)(addr >> 0); 259 } 260 } 261 262 static inline unsigned int fsl_espi_cmd2addr(u8 *cmd) 263 { 264 if (cmd) 265 return cmd[1] << 16 | cmd[2] << 8 | cmd[3] << 0; 266 267 return 0; 268 } 269 270 static void fsl_espi_do_trans(struct spi_message *m, 271 struct fsl_espi_transfer *tr) 272 { 273 struct spi_device *spi = m->spi; 274 struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master); 275 struct fsl_espi_transfer *espi_trans = tr; 276 struct spi_message message; 277 struct spi_transfer *t, *first, trans; 278 int status = 0; 279 280 spi_message_init(&message); 281 memset(&trans, 0, sizeof(trans)); 282 283 first = list_first_entry(&m->transfers, struct spi_transfer, 284 transfer_list); 285 list_for_each_entry(t, &m->transfers, transfer_list) { 286 if ((first->bits_per_word != t->bits_per_word) || 287 (first->speed_hz != t->speed_hz)) { 288 espi_trans->status = -EINVAL; 289 dev_err(mspi->dev, 290 "bits_per_word/speed_hz should be same for the same SPI transfer\n"); 291 return; 292 } 293 294 trans.speed_hz = t->speed_hz; 295 trans.bits_per_word = t->bits_per_word; 296 trans.delay_usecs = max(first->delay_usecs, t->delay_usecs); 297 } 298 299 trans.len = espi_trans->len; 300 trans.tx_buf = espi_trans->tx_buf; 301 trans.rx_buf = espi_trans->rx_buf; 302 spi_message_add_tail(&trans, &message); 303 304 list_for_each_entry(t, &message.transfers, transfer_list) { 305 if (t->bits_per_word || t->speed_hz) { 306 status = -EINVAL; 307 308 status = fsl_espi_setup_transfer(spi, t); 309 if (status < 0) 310 break; 311 } 312 313 if (t->len) 314 status = fsl_espi_bufs(spi, t); 315 316 if (status) { 317 status = -EMSGSIZE; 318 break; 319 } 320 321 if (t->delay_usecs) 322 udelay(t->delay_usecs); 323 } 324 325 espi_trans->status = status; 326 fsl_espi_setup_transfer(spi, NULL); 327 } 328 329 static void fsl_espi_cmd_trans(struct spi_message *m, 330 struct fsl_espi_transfer *trans, u8 *rx_buff) 331 { 332 struct spi_transfer *t; 333 u8 *local_buf; 334 int i = 0; 335 struct fsl_espi_transfer *espi_trans = trans; 336 337 local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL); 338 if (!local_buf) { 339 espi_trans->status = -ENOMEM; 340 return; 341 } 342 343 list_for_each_entry(t, &m->transfers, transfer_list) { 344 if (t->tx_buf) { 345 memcpy(local_buf + i, t->tx_buf, t->len); 346 i += t->len; 347 } 348 } 349 350 espi_trans->tx_buf = local_buf; 351 espi_trans->rx_buf = local_buf; 352 fsl_espi_do_trans(m, espi_trans); 353 354 espi_trans->actual_length = espi_trans->len; 355 kfree(local_buf); 356 } 357 358 static void fsl_espi_rw_trans(struct spi_message *m, 359 struct fsl_espi_transfer *trans, u8 *rx_buff) 360 { 361 struct fsl_espi_transfer *espi_trans = trans; 362 unsigned int n_tx = espi_trans->n_tx; 363 unsigned int n_rx = espi_trans->n_rx; 364 struct spi_transfer *t; 365 u8 *local_buf; 366 u8 *rx_buf = rx_buff; 367 unsigned int trans_len; 368 unsigned int addr; 369 int i, pos, loop; 370 371 local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL); 372 if (!local_buf) { 373 espi_trans->status = -ENOMEM; 374 return; 375 } 376 377 for (pos = 0, loop = 0; pos < n_rx; pos += trans_len, loop++) { 378 trans_len = n_rx - pos; 379 if (trans_len > SPCOM_TRANLEN_MAX - n_tx) 380 trans_len = SPCOM_TRANLEN_MAX - n_tx; 381 382 i = 0; 383 list_for_each_entry(t, &m->transfers, transfer_list) { 384 if (t->tx_buf) { 385 memcpy(local_buf + i, t->tx_buf, t->len); 386 i += t->len; 387 } 388 } 389 390 if (pos > 0) { 391 addr = fsl_espi_cmd2addr(local_buf); 392 addr += pos; 393 fsl_espi_addr2cmd(addr, local_buf); 394 } 395 396 espi_trans->n_tx = n_tx; 397 espi_trans->n_rx = trans_len; 398 espi_trans->len = trans_len + n_tx; 399 espi_trans->tx_buf = local_buf; 400 espi_trans->rx_buf = local_buf; 401 fsl_espi_do_trans(m, espi_trans); 402 403 memcpy(rx_buf + pos, espi_trans->rx_buf + n_tx, trans_len); 404 405 if (loop > 0) 406 espi_trans->actual_length += espi_trans->len - n_tx; 407 else 408 espi_trans->actual_length += espi_trans->len; 409 } 410 411 kfree(local_buf); 412 } 413 414 static int fsl_espi_do_one_msg(struct spi_master *master, 415 struct spi_message *m) 416 { 417 struct spi_transfer *t; 418 u8 *rx_buf = NULL; 419 unsigned int n_tx = 0; 420 unsigned int n_rx = 0; 421 struct fsl_espi_transfer espi_trans; 422 423 list_for_each_entry(t, &m->transfers, transfer_list) { 424 if (t->tx_buf) 425 n_tx += t->len; 426 if (t->rx_buf) { 427 n_rx += t->len; 428 rx_buf = t->rx_buf; 429 } 430 } 431 432 espi_trans.n_tx = n_tx; 433 espi_trans.n_rx = n_rx; 434 espi_trans.len = n_tx + n_rx; 435 espi_trans.actual_length = 0; 436 espi_trans.status = 0; 437 438 if (!rx_buf) 439 fsl_espi_cmd_trans(m, &espi_trans, NULL); 440 else 441 fsl_espi_rw_trans(m, &espi_trans, rx_buf); 442 443 m->actual_length = espi_trans.actual_length; 444 m->status = espi_trans.status; 445 spi_finalize_current_message(master); 446 return 0; 447 } 448 449 static int fsl_espi_setup(struct spi_device *spi) 450 { 451 struct mpc8xxx_spi *mpc8xxx_spi; 452 struct fsl_espi_reg *reg_base; 453 int retval; 454 u32 hw_mode; 455 u32 loop_mode; 456 struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi); 457 458 if (!spi->max_speed_hz) 459 return -EINVAL; 460 461 if (!cs) { 462 cs = kzalloc(sizeof(*cs), GFP_KERNEL); 463 if (!cs) 464 return -ENOMEM; 465 spi_set_ctldata(spi, cs); 466 } 467 468 mpc8xxx_spi = spi_master_get_devdata(spi->master); 469 reg_base = mpc8xxx_spi->reg_base; 470 471 hw_mode = cs->hw_mode; /* Save original settings */ 472 cs->hw_mode = mpc8xxx_spi_read_reg( 473 ®_base->csmode[spi->chip_select]); 474 /* mask out bits we are going to set */ 475 cs->hw_mode &= ~(CSMODE_CP_BEGIN_EDGECLK | CSMODE_CI_INACTIVEHIGH 476 | CSMODE_REV); 477 478 if (spi->mode & SPI_CPHA) 479 cs->hw_mode |= CSMODE_CP_BEGIN_EDGECLK; 480 if (spi->mode & SPI_CPOL) 481 cs->hw_mode |= CSMODE_CI_INACTIVEHIGH; 482 if (!(spi->mode & SPI_LSB_FIRST)) 483 cs->hw_mode |= CSMODE_REV; 484 485 /* Handle the loop mode */ 486 loop_mode = mpc8xxx_spi_read_reg(®_base->mode); 487 loop_mode &= ~SPMODE_LOOP; 488 if (spi->mode & SPI_LOOP) 489 loop_mode |= SPMODE_LOOP; 490 mpc8xxx_spi_write_reg(®_base->mode, loop_mode); 491 492 retval = fsl_espi_setup_transfer(spi, NULL); 493 if (retval < 0) { 494 cs->hw_mode = hw_mode; /* Restore settings */ 495 return retval; 496 } 497 return 0; 498 } 499 500 static void fsl_espi_cleanup(struct spi_device *spi) 501 { 502 struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi); 503 504 kfree(cs); 505 spi_set_ctldata(spi, NULL); 506 } 507 508 void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events) 509 { 510 struct fsl_espi_reg *reg_base = mspi->reg_base; 511 512 /* We need handle RX first */ 513 if (events & SPIE_NE) { 514 u32 rx_data, tmp; 515 u8 rx_data_8; 516 517 /* Spin until RX is done */ 518 while (SPIE_RXCNT(events) < min(4, mspi->len)) { 519 cpu_relax(); 520 events = mpc8xxx_spi_read_reg(®_base->event); 521 } 522 523 if (mspi->len >= 4) { 524 rx_data = mpc8xxx_spi_read_reg(®_base->receive); 525 } else { 526 tmp = mspi->len; 527 rx_data = 0; 528 while (tmp--) { 529 rx_data_8 = in_8((u8 *)®_base->receive); 530 rx_data |= (rx_data_8 << (tmp * 8)); 531 } 532 533 rx_data <<= (4 - mspi->len) * 8; 534 } 535 536 mspi->len -= 4; 537 538 if (mspi->rx) 539 mspi->get_rx(rx_data, mspi); 540 } 541 542 if (!(events & SPIE_NF)) { 543 int ret; 544 545 /* spin until TX is done */ 546 ret = spin_event_timeout(((events = mpc8xxx_spi_read_reg( 547 ®_base->event)) & SPIE_NF) == 0, 1000, 0); 548 if (!ret) { 549 dev_err(mspi->dev, "tired waiting for SPIE_NF\n"); 550 return; 551 } 552 } 553 554 /* Clear the events */ 555 mpc8xxx_spi_write_reg(®_base->event, events); 556 557 mspi->count -= 1; 558 if (mspi->count) { 559 u32 word = mspi->get_tx(mspi); 560 561 mpc8xxx_spi_write_reg(®_base->transmit, word); 562 } else { 563 complete(&mspi->done); 564 } 565 } 566 567 static irqreturn_t fsl_espi_irq(s32 irq, void *context_data) 568 { 569 struct mpc8xxx_spi *mspi = context_data; 570 struct fsl_espi_reg *reg_base = mspi->reg_base; 571 irqreturn_t ret = IRQ_NONE; 572 u32 events; 573 574 /* Get interrupt events(tx/rx) */ 575 events = mpc8xxx_spi_read_reg(®_base->event); 576 if (events) 577 ret = IRQ_HANDLED; 578 579 dev_vdbg(mspi->dev, "%s: events %x\n", __func__, events); 580 581 fsl_espi_cpu_irq(mspi, events); 582 583 return ret; 584 } 585 586 static void fsl_espi_remove(struct mpc8xxx_spi *mspi) 587 { 588 iounmap(mspi->reg_base); 589 } 590 591 static int fsl_espi_suspend(struct spi_master *master) 592 { 593 struct mpc8xxx_spi *mpc8xxx_spi; 594 struct fsl_espi_reg *reg_base; 595 u32 regval; 596 597 mpc8xxx_spi = spi_master_get_devdata(master); 598 reg_base = mpc8xxx_spi->reg_base; 599 600 regval = mpc8xxx_spi_read_reg(®_base->mode); 601 regval &= ~SPMODE_ENABLE; 602 mpc8xxx_spi_write_reg(®_base->mode, regval); 603 604 return 0; 605 } 606 607 static int fsl_espi_resume(struct spi_master *master) 608 { 609 struct mpc8xxx_spi *mpc8xxx_spi; 610 struct fsl_espi_reg *reg_base; 611 u32 regval; 612 613 mpc8xxx_spi = spi_master_get_devdata(master); 614 reg_base = mpc8xxx_spi->reg_base; 615 616 regval = mpc8xxx_spi_read_reg(®_base->mode); 617 regval |= SPMODE_ENABLE; 618 mpc8xxx_spi_write_reg(®_base->mode, regval); 619 620 return 0; 621 } 622 623 static struct spi_master * fsl_espi_probe(struct device *dev, 624 struct resource *mem, unsigned int irq) 625 { 626 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); 627 struct spi_master *master; 628 struct mpc8xxx_spi *mpc8xxx_spi; 629 struct fsl_espi_reg *reg_base; 630 struct device_node *nc; 631 const __be32 *prop; 632 u32 regval, csmode; 633 int i, len, ret = 0; 634 635 master = spi_alloc_master(dev, sizeof(struct mpc8xxx_spi)); 636 if (!master) { 637 ret = -ENOMEM; 638 goto err; 639 } 640 641 dev_set_drvdata(dev, master); 642 643 mpc8xxx_spi_probe(dev, mem, irq); 644 645 master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16); 646 master->setup = fsl_espi_setup; 647 master->cleanup = fsl_espi_cleanup; 648 master->transfer_one_message = fsl_espi_do_one_msg; 649 master->prepare_transfer_hardware = fsl_espi_resume; 650 master->unprepare_transfer_hardware = fsl_espi_suspend; 651 652 mpc8xxx_spi = spi_master_get_devdata(master); 653 mpc8xxx_spi->spi_remove = fsl_espi_remove; 654 655 mpc8xxx_spi->reg_base = ioremap(mem->start, resource_size(mem)); 656 if (!mpc8xxx_spi->reg_base) { 657 ret = -ENOMEM; 658 goto err_probe; 659 } 660 661 reg_base = mpc8xxx_spi->reg_base; 662 663 /* Register for SPI Interrupt */ 664 ret = request_irq(mpc8xxx_spi->irq, fsl_espi_irq, 665 0, "fsl_espi", mpc8xxx_spi); 666 if (ret) 667 goto free_irq; 668 669 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) { 670 mpc8xxx_spi->rx_shift = 16; 671 mpc8xxx_spi->tx_shift = 24; 672 } 673 674 /* SPI controller initializations */ 675 mpc8xxx_spi_write_reg(®_base->mode, 0); 676 mpc8xxx_spi_write_reg(®_base->mask, 0); 677 mpc8xxx_spi_write_reg(®_base->command, 0); 678 mpc8xxx_spi_write_reg(®_base->event, 0xffffffff); 679 680 /* Init eSPI CS mode register */ 681 for_each_available_child_of_node(master->dev.of_node, nc) { 682 /* get chip select */ 683 prop = of_get_property(nc, "reg", &len); 684 if (!prop || len < sizeof(*prop)) 685 continue; 686 i = be32_to_cpup(prop); 687 if (i < 0 || i >= pdata->max_chipselect) 688 continue; 689 690 csmode = CSMODE_INIT_VAL; 691 /* check if CSBEF is set in device tree */ 692 prop = of_get_property(nc, "fsl,csbef", &len); 693 if (prop && len >= sizeof(*prop)) { 694 csmode &= ~(CSMODE_BEF(0xf)); 695 csmode |= CSMODE_BEF(be32_to_cpup(prop)); 696 } 697 /* check if CSAFT is set in device tree */ 698 prop = of_get_property(nc, "fsl,csaft", &len); 699 if (prop && len >= sizeof(*prop)) { 700 csmode &= ~(CSMODE_AFT(0xf)); 701 csmode |= CSMODE_AFT(be32_to_cpup(prop)); 702 } 703 mpc8xxx_spi_write_reg(®_base->csmode[i], csmode); 704 705 dev_info(dev, "cs=%d, init_csmode=0x%x\n", i, csmode); 706 } 707 708 /* Enable SPI interface */ 709 regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE; 710 711 mpc8xxx_spi_write_reg(®_base->mode, regval); 712 713 ret = spi_register_master(master); 714 if (ret < 0) 715 goto unreg_master; 716 717 dev_info(dev, "at 0x%p (irq = %d)\n", reg_base, mpc8xxx_spi->irq); 718 719 return master; 720 721 unreg_master: 722 free_irq(mpc8xxx_spi->irq, mpc8xxx_spi); 723 free_irq: 724 iounmap(mpc8xxx_spi->reg_base); 725 err_probe: 726 spi_master_put(master); 727 err: 728 return ERR_PTR(ret); 729 } 730 731 static int of_fsl_espi_get_chipselects(struct device *dev) 732 { 733 struct device_node *np = dev->of_node; 734 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); 735 const u32 *prop; 736 int len; 737 738 prop = of_get_property(np, "fsl,espi-num-chipselects", &len); 739 if (!prop || len < sizeof(*prop)) { 740 dev_err(dev, "No 'fsl,espi-num-chipselects' property\n"); 741 return -EINVAL; 742 } 743 744 pdata->max_chipselect = *prop; 745 pdata->cs_control = NULL; 746 747 return 0; 748 } 749 750 static int of_fsl_espi_probe(struct platform_device *ofdev) 751 { 752 struct device *dev = &ofdev->dev; 753 struct device_node *np = ofdev->dev.of_node; 754 struct spi_master *master; 755 struct resource mem; 756 unsigned int irq; 757 int ret = -ENOMEM; 758 759 ret = of_mpc8xxx_spi_probe(ofdev); 760 if (ret) 761 return ret; 762 763 ret = of_fsl_espi_get_chipselects(dev); 764 if (ret) 765 goto err; 766 767 ret = of_address_to_resource(np, 0, &mem); 768 if (ret) 769 goto err; 770 771 irq = irq_of_parse_and_map(np, 0); 772 if (!irq) { 773 ret = -EINVAL; 774 goto err; 775 } 776 777 master = fsl_espi_probe(dev, &mem, irq); 778 if (IS_ERR(master)) { 779 ret = PTR_ERR(master); 780 goto err; 781 } 782 783 return 0; 784 785 err: 786 return ret; 787 } 788 789 static int of_fsl_espi_remove(struct platform_device *dev) 790 { 791 return mpc8xxx_spi_remove(&dev->dev); 792 } 793 794 #ifdef CONFIG_PM_SLEEP 795 static int of_fsl_espi_suspend(struct device *dev) 796 { 797 struct spi_master *master = dev_get_drvdata(dev); 798 int ret; 799 800 ret = spi_master_suspend(master); 801 if (ret) { 802 dev_warn(dev, "cannot suspend master\n"); 803 return ret; 804 } 805 806 return fsl_espi_suspend(master); 807 } 808 809 static int of_fsl_espi_resume(struct device *dev) 810 { 811 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); 812 struct spi_master *master = dev_get_drvdata(dev); 813 struct mpc8xxx_spi *mpc8xxx_spi; 814 struct fsl_espi_reg *reg_base; 815 u32 regval; 816 int i; 817 818 mpc8xxx_spi = spi_master_get_devdata(master); 819 reg_base = mpc8xxx_spi->reg_base; 820 821 /* SPI controller initializations */ 822 mpc8xxx_spi_write_reg(®_base->mode, 0); 823 mpc8xxx_spi_write_reg(®_base->mask, 0); 824 mpc8xxx_spi_write_reg(®_base->command, 0); 825 mpc8xxx_spi_write_reg(®_base->event, 0xffffffff); 826 827 /* Init eSPI CS mode register */ 828 for (i = 0; i < pdata->max_chipselect; i++) 829 mpc8xxx_spi_write_reg(®_base->csmode[i], CSMODE_INIT_VAL); 830 831 /* Enable SPI interface */ 832 regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE; 833 834 mpc8xxx_spi_write_reg(®_base->mode, regval); 835 836 return spi_master_resume(master); 837 } 838 #endif /* CONFIG_PM_SLEEP */ 839 840 static const struct dev_pm_ops espi_pm = { 841 SET_SYSTEM_SLEEP_PM_OPS(of_fsl_espi_suspend, of_fsl_espi_resume) 842 }; 843 844 static const struct of_device_id of_fsl_espi_match[] = { 845 { .compatible = "fsl,mpc8536-espi" }, 846 {} 847 }; 848 MODULE_DEVICE_TABLE(of, of_fsl_espi_match); 849 850 static struct platform_driver fsl_espi_driver = { 851 .driver = { 852 .name = "fsl_espi", 853 .of_match_table = of_fsl_espi_match, 854 .pm = &espi_pm, 855 }, 856 .probe = of_fsl_espi_probe, 857 .remove = of_fsl_espi_remove, 858 }; 859 module_platform_driver(fsl_espi_driver); 860 861 MODULE_AUTHOR("Mingkai Hu"); 862 MODULE_DESCRIPTION("Enhanced Freescale SPI Driver"); 863 MODULE_LICENSE("GPL"); 864