1 // SPDX-License-Identifier: GPL-2.0+ 2 // Copyright 2018 IBM Corp 3 /* 4 * A FSI master controller, using a simple GPIO bit-banging interface 5 */ 6 7 #include <linux/crc4.h> 8 #include <linux/delay.h> 9 #include <linux/device.h> 10 #include <linux/fsi.h> 11 #include <linux/gpio/consumer.h> 12 #include <linux/io.h> 13 #include <linux/irqflags.h> 14 #include <linux/module.h> 15 #include <linux/of.h> 16 #include <linux/platform_device.h> 17 #include <linux/slab.h> 18 #include <linux/regmap.h> 19 #include <linux/firmware.h> 20 #include <linux/gpio/aspeed.h> 21 #include <linux/mfd/syscon.h> 22 #include <linux/of_address.h> 23 #include <linux/genalloc.h> 24 25 #include "fsi-master.h" 26 #include "cf-fsi-fw.h" 27 28 #define FW_FILE_NAME "cf-fsi-fw.bin" 29 30 /* Common SCU based coprocessor control registers */ 31 #define SCU_COPRO_CTRL 0x100 32 #define SCU_COPRO_RESET 0x00000002 33 #define SCU_COPRO_CLK_EN 0x00000001 34 35 /* AST2500 specific ones */ 36 #define SCU_2500_COPRO_SEG0 0x104 37 #define SCU_2500_COPRO_SEG1 0x108 38 #define SCU_2500_COPRO_SEG2 0x10c 39 #define SCU_2500_COPRO_SEG3 0x110 40 #define SCU_2500_COPRO_SEG4 0x114 41 #define SCU_2500_COPRO_SEG5 0x118 42 #define SCU_2500_COPRO_SEG6 0x11c 43 #define SCU_2500_COPRO_SEG7 0x120 44 #define SCU_2500_COPRO_SEG8 0x124 45 #define SCU_2500_COPRO_SEG_SWAP 0x00000001 46 #define SCU_2500_COPRO_CACHE_CTL 0x128 47 #define SCU_2500_COPRO_CACHE_EN 0x00000001 48 #define SCU_2500_COPRO_SEG0_CACHE_EN 0x00000002 49 #define SCU_2500_COPRO_SEG1_CACHE_EN 0x00000004 50 #define SCU_2500_COPRO_SEG2_CACHE_EN 0x00000008 51 #define SCU_2500_COPRO_SEG3_CACHE_EN 0x00000010 52 #define SCU_2500_COPRO_SEG4_CACHE_EN 0x00000020 53 #define SCU_2500_COPRO_SEG5_CACHE_EN 0x00000040 54 #define SCU_2500_COPRO_SEG6_CACHE_EN 0x00000080 55 #define SCU_2500_COPRO_SEG7_CACHE_EN 0x00000100 56 #define SCU_2500_COPRO_SEG8_CACHE_EN 0x00000200 57 58 #define SCU_2400_COPRO_SEG0 0x104 59 #define SCU_2400_COPRO_SEG2 0x108 60 #define SCU_2400_COPRO_SEG4 0x10c 61 #define SCU_2400_COPRO_SEG6 0x110 62 #define SCU_2400_COPRO_SEG8 0x114 63 #define SCU_2400_COPRO_SEG_SWAP 0x80000000 64 #define SCU_2400_COPRO_CACHE_CTL 0x118 65 #define SCU_2400_COPRO_CACHE_EN 0x00000001 66 #define SCU_2400_COPRO_SEG0_CACHE_EN 0x00000002 67 #define SCU_2400_COPRO_SEG2_CACHE_EN 0x00000004 68 #define SCU_2400_COPRO_SEG4_CACHE_EN 0x00000008 69 #define SCU_2400_COPRO_SEG6_CACHE_EN 0x00000010 70 #define SCU_2400_COPRO_SEG8_CACHE_EN 0x00000020 71 72 /* CVIC registers */ 73 #define CVIC_EN_REG 0x10 74 #define CVIC_TRIG_REG 0x18 75 76 /* 77 * System register base address (needed for configuring the 78 * coldfire maps) 79 */ 80 #define SYSREG_BASE 0x1e600000 81 82 /* Amount of SRAM required */ 83 #define SRAM_SIZE 0x1000 84 85 #define LAST_ADDR_INVALID 0x1 86 87 struct fsi_master_acf { 88 struct fsi_master master; 89 struct device *dev; 90 struct regmap *scu; 91 struct mutex lock; /* mutex for command ordering */ 92 struct gpio_desc *gpio_clk; 93 struct gpio_desc *gpio_data; 94 struct gpio_desc *gpio_trans; /* Voltage translator */ 95 struct gpio_desc *gpio_enable; /* FSI enable */ 96 struct gpio_desc *gpio_mux; /* Mux control */ 97 uint16_t gpio_clk_vreg; 98 uint16_t gpio_clk_dreg; 99 uint16_t gpio_dat_vreg; 100 uint16_t gpio_dat_dreg; 101 uint16_t gpio_tra_vreg; 102 uint16_t gpio_tra_dreg; 103 uint8_t gpio_clk_bit; 104 uint8_t gpio_dat_bit; 105 uint8_t gpio_tra_bit; 106 uint32_t cf_mem_addr; 107 size_t cf_mem_size; 108 void __iomem *cf_mem; 109 void __iomem *cvic; 110 struct gen_pool *sram_pool; 111 void __iomem *sram; 112 bool is_ast2500; 113 bool external_mode; 114 bool trace_enabled; 115 uint32_t last_addr; 116 uint8_t t_send_delay; 117 uint8_t t_echo_delay; 118 uint32_t cvic_sw_irq; 119 }; 120 #define to_fsi_master_acf(m) container_of(m, struct fsi_master_acf, master) 121 122 struct fsi_msg { 123 uint64_t msg; 124 uint8_t bits; 125 }; 126 127 #define CREATE_TRACE_POINTS 128 #include <trace/events/fsi_master_ast_cf.h> 129 130 static void msg_push_bits(struct fsi_msg *msg, uint64_t data, int bits) 131 { 132 msg->msg <<= bits; 133 msg->msg |= data & ((1ull << bits) - 1); 134 msg->bits += bits; 135 } 136 137 static void msg_push_crc(struct fsi_msg *msg) 138 { 139 uint8_t crc; 140 int top; 141 142 top = msg->bits & 0x3; 143 144 /* start bit, and any non-aligned top bits */ 145 crc = crc4(0, 1 << top | msg->msg >> (msg->bits - top), top + 1); 146 147 /* aligned bits */ 148 crc = crc4(crc, msg->msg, msg->bits - top); 149 150 msg_push_bits(msg, crc, 4); 151 } 152 153 static void msg_finish_cmd(struct fsi_msg *cmd) 154 { 155 /* Left align message */ 156 cmd->msg <<= (64 - cmd->bits); 157 } 158 159 static bool check_same_address(struct fsi_master_acf *master, int id, 160 uint32_t addr) 161 { 162 /* this will also handle LAST_ADDR_INVALID */ 163 return master->last_addr == (((id & 0x3) << 21) | (addr & ~0x3)); 164 } 165 166 static bool check_relative_address(struct fsi_master_acf *master, int id, 167 uint32_t addr, uint32_t *rel_addrp) 168 { 169 uint32_t last_addr = master->last_addr; 170 int32_t rel_addr; 171 172 if (last_addr == LAST_ADDR_INVALID) 173 return false; 174 175 /* We may be in 23-bit addressing mode, which uses the id as the 176 * top two address bits. So, if we're referencing a different ID, 177 * use absolute addresses. 178 */ 179 if (((last_addr >> 21) & 0x3) != id) 180 return false; 181 182 /* remove the top two bits from any 23-bit addressing */ 183 last_addr &= (1 << 21) - 1; 184 185 /* We know that the addresses are limited to 21 bits, so this won't 186 * overflow the signed rel_addr */ 187 rel_addr = addr - last_addr; 188 if (rel_addr > 255 || rel_addr < -256) 189 return false; 190 191 *rel_addrp = (uint32_t)rel_addr; 192 193 return true; 194 } 195 196 static void last_address_update(struct fsi_master_acf *master, 197 int id, bool valid, uint32_t addr) 198 { 199 if (!valid) 200 master->last_addr = LAST_ADDR_INVALID; 201 else 202 master->last_addr = ((id & 0x3) << 21) | (addr & ~0x3); 203 } 204 205 /* 206 * Encode an Absolute/Relative/Same Address command 207 */ 208 static void build_ar_command(struct fsi_master_acf *master, 209 struct fsi_msg *cmd, uint8_t id, 210 uint32_t addr, size_t size, 211 const void *data) 212 { 213 int i, addr_bits, opcode_bits; 214 bool write = !!data; 215 uint8_t ds, opcode; 216 uint32_t rel_addr; 217 218 cmd->bits = 0; 219 cmd->msg = 0; 220 221 /* we have 21 bits of address max */ 222 addr &= ((1 << 21) - 1); 223 224 /* cmd opcodes are variable length - SAME_AR is only two bits */ 225 opcode_bits = 3; 226 227 if (check_same_address(master, id, addr)) { 228 /* we still address the byte offset within the word */ 229 addr_bits = 2; 230 opcode_bits = 2; 231 opcode = FSI_CMD_SAME_AR; 232 trace_fsi_master_acf_cmd_same_addr(master); 233 234 } else if (check_relative_address(master, id, addr, &rel_addr)) { 235 /* 8 bits plus sign */ 236 addr_bits = 9; 237 addr = rel_addr; 238 opcode = FSI_CMD_REL_AR; 239 trace_fsi_master_acf_cmd_rel_addr(master, rel_addr); 240 241 } else { 242 addr_bits = 21; 243 opcode = FSI_CMD_ABS_AR; 244 trace_fsi_master_acf_cmd_abs_addr(master, addr); 245 } 246 247 /* 248 * The read/write size is encoded in the lower bits of the address 249 * (as it must be naturally-aligned), and the following ds bit. 250 * 251 * size addr:1 addr:0 ds 252 * 1 x x 0 253 * 2 x 0 1 254 * 4 0 1 1 255 * 256 */ 257 ds = size > 1 ? 1 : 0; 258 addr &= ~(size - 1); 259 if (size == 4) 260 addr |= 1; 261 262 msg_push_bits(cmd, id, 2); 263 msg_push_bits(cmd, opcode, opcode_bits); 264 msg_push_bits(cmd, write ? 0 : 1, 1); 265 msg_push_bits(cmd, addr, addr_bits); 266 msg_push_bits(cmd, ds, 1); 267 for (i = 0; write && i < size; i++) 268 msg_push_bits(cmd, ((uint8_t *)data)[i], 8); 269 270 msg_push_crc(cmd); 271 msg_finish_cmd(cmd); 272 } 273 274 static void build_dpoll_command(struct fsi_msg *cmd, uint8_t slave_id) 275 { 276 cmd->bits = 0; 277 cmd->msg = 0; 278 279 msg_push_bits(cmd, slave_id, 2); 280 msg_push_bits(cmd, FSI_CMD_DPOLL, 3); 281 msg_push_crc(cmd); 282 msg_finish_cmd(cmd); 283 } 284 285 static void build_epoll_command(struct fsi_msg *cmd, uint8_t slave_id) 286 { 287 cmd->bits = 0; 288 cmd->msg = 0; 289 290 msg_push_bits(cmd, slave_id, 2); 291 msg_push_bits(cmd, FSI_CMD_EPOLL, 3); 292 msg_push_crc(cmd); 293 msg_finish_cmd(cmd); 294 } 295 296 static void build_term_command(struct fsi_msg *cmd, uint8_t slave_id) 297 { 298 cmd->bits = 0; 299 cmd->msg = 0; 300 301 msg_push_bits(cmd, slave_id, 2); 302 msg_push_bits(cmd, FSI_CMD_TERM, 6); 303 msg_push_crc(cmd); 304 msg_finish_cmd(cmd); 305 } 306 307 static int do_copro_command(struct fsi_master_acf *master, uint32_t op) 308 { 309 uint32_t timeout = 10000000; 310 uint8_t stat; 311 312 trace_fsi_master_acf_copro_command(master, op); 313 314 /* Send command */ 315 iowrite32be(op, master->sram + CMD_STAT_REG); 316 317 /* Ring doorbell if any */ 318 if (master->cvic) 319 iowrite32(0x2, master->cvic + CVIC_TRIG_REG); 320 321 /* Wait for status to indicate completion (or error) */ 322 do { 323 if (timeout-- == 0) { 324 dev_warn(master->dev, 325 "Timeout waiting for coprocessor completion\n"); 326 return -ETIMEDOUT; 327 } 328 stat = ioread8(master->sram + CMD_STAT_REG); 329 } while(stat < STAT_COMPLETE || stat == 0xff); 330 331 if (stat == STAT_COMPLETE) 332 return 0; 333 switch(stat) { 334 case STAT_ERR_INVAL_CMD: 335 return -EINVAL; 336 case STAT_ERR_INVAL_IRQ: 337 return -EIO; 338 case STAT_ERR_MTOE: 339 return -ESHUTDOWN; 340 } 341 return -ENXIO; 342 } 343 344 static int clock_zeros(struct fsi_master_acf *master, int count) 345 { 346 while (count) { 347 int rc, lcnt = min(count, 255); 348 349 rc = do_copro_command(master, 350 CMD_IDLE_CLOCKS | (lcnt << CMD_REG_CLEN_SHIFT)); 351 if (rc) 352 return rc; 353 count -= lcnt; 354 } 355 return 0; 356 } 357 358 static int send_request(struct fsi_master_acf *master, struct fsi_msg *cmd, 359 unsigned int resp_bits) 360 { 361 uint32_t op; 362 363 trace_fsi_master_acf_send_request(master, cmd, resp_bits); 364 365 /* Store message into SRAM */ 366 iowrite32be((cmd->msg >> 32), master->sram + CMD_DATA); 367 iowrite32be((cmd->msg & 0xffffffff), master->sram + CMD_DATA + 4); 368 369 op = CMD_COMMAND; 370 op |= cmd->bits << CMD_REG_CLEN_SHIFT; 371 if (resp_bits) 372 op |= resp_bits << CMD_REG_RLEN_SHIFT; 373 374 return do_copro_command(master, op); 375 } 376 377 static int read_copro_response(struct fsi_master_acf *master, uint8_t size, 378 uint32_t *response, u8 *tag) 379 { 380 uint8_t rtag = ioread8(master->sram + STAT_RTAG) & 0xf; 381 uint8_t rcrc = ioread8(master->sram + STAT_RCRC) & 0xf; 382 uint32_t rdata = 0; 383 uint32_t crc; 384 uint8_t ack; 385 386 *tag = ack = rtag & 3; 387 388 /* we have a whole message now; check CRC */ 389 crc = crc4(0, 1, 1); 390 crc = crc4(crc, rtag, 4); 391 if (ack == FSI_RESP_ACK && size) { 392 rdata = ioread32be(master->sram + RSP_DATA); 393 crc = crc4(crc, rdata, size); 394 if (response) 395 *response = rdata; 396 } 397 crc = crc4(crc, rcrc, 4); 398 399 trace_fsi_master_acf_copro_response(master, rtag, rcrc, rdata, crc == 0); 400 401 if (crc) { 402 /* 403 * Check if it's all 1's or all 0's, that probably means 404 * the host is off 405 */ 406 if ((rtag == 0xf && rcrc == 0xf) || (rtag == 0 && rcrc == 0)) 407 return -ENODEV; 408 dev_dbg(master->dev, "Bad response CRC !\n"); 409 return -EAGAIN; 410 } 411 return 0; 412 } 413 414 static int send_term(struct fsi_master_acf *master, uint8_t slave) 415 { 416 struct fsi_msg cmd; 417 uint8_t tag; 418 int rc; 419 420 build_term_command(&cmd, slave); 421 422 rc = send_request(master, &cmd, 0); 423 if (rc) { 424 dev_warn(master->dev, "Error %d sending term\n", rc); 425 return rc; 426 } 427 428 rc = read_copro_response(master, 0, NULL, &tag); 429 if (rc < 0) { 430 dev_err(master->dev, 431 "TERM failed; lost communication with slave\n"); 432 return -EIO; 433 } else if (tag != FSI_RESP_ACK) { 434 dev_err(master->dev, "TERM failed; response %d\n", tag); 435 return -EIO; 436 } 437 return 0; 438 } 439 440 static void dump_ucode_trace(struct fsi_master_acf *master) 441 { 442 char trbuf[52]; 443 char *p; 444 int i; 445 446 dev_dbg(master->dev, 447 "CMDSTAT:%08x RTAG=%02x RCRC=%02x RDATA=%02x #INT=%08x\n", 448 ioread32be(master->sram + CMD_STAT_REG), 449 ioread8(master->sram + STAT_RTAG), 450 ioread8(master->sram + STAT_RCRC), 451 ioread32be(master->sram + RSP_DATA), 452 ioread32be(master->sram + INT_CNT)); 453 454 for (i = 0; i < 512; i++) { 455 uint8_t v; 456 if ((i % 16) == 0) 457 p = trbuf; 458 v = ioread8(master->sram + TRACEBUF + i); 459 p += sprintf(p, "%02x ", v); 460 if (((i % 16) == 15) || v == TR_END) 461 dev_dbg(master->dev, "%s\n", trbuf); 462 if (v == TR_END) 463 break; 464 } 465 } 466 467 static int handle_response(struct fsi_master_acf *master, 468 uint8_t slave, uint8_t size, void *data) 469 { 470 int busy_count = 0, rc; 471 int crc_err_retries = 0; 472 struct fsi_msg cmd; 473 uint32_t response; 474 uint8_t tag; 475 retry: 476 rc = read_copro_response(master, size, &response, &tag); 477 478 /* Handle retries on CRC errors */ 479 if (rc == -EAGAIN) { 480 /* Too many retries ? */ 481 if (crc_err_retries++ > FSI_CRC_ERR_RETRIES) { 482 /* 483 * Pass it up as a -EIO otherwise upper level will retry 484 * the whole command which isn't what we want here. 485 */ 486 rc = -EIO; 487 goto bail; 488 } 489 trace_fsi_master_acf_crc_rsp_error(master, crc_err_retries); 490 if (master->trace_enabled) 491 dump_ucode_trace(master); 492 rc = clock_zeros(master, FSI_MASTER_EPOLL_CLOCKS); 493 if (rc) { 494 dev_warn(master->dev, 495 "Error %d clocking zeros for E_POLL\n", rc); 496 return rc; 497 } 498 build_epoll_command(&cmd, slave); 499 rc = send_request(master, &cmd, size); 500 if (rc) { 501 dev_warn(master->dev, "Error %d sending E_POLL\n", rc); 502 return -EIO; 503 } 504 goto retry; 505 } 506 if (rc) 507 return rc; 508 509 switch (tag) { 510 case FSI_RESP_ACK: 511 if (size && data) { 512 if (size == 32) 513 *(__be32 *)data = cpu_to_be32(response); 514 else if (size == 16) 515 *(__be16 *)data = cpu_to_be16(response); 516 else 517 *(u8 *)data = response; 518 } 519 break; 520 case FSI_RESP_BUSY: 521 /* 522 * Its necessary to clock slave before issuing 523 * d-poll, not indicated in the hardware protocol 524 * spec. < 20 clocks causes slave to hang, 21 ok. 525 */ 526 dev_dbg(master->dev, "Busy, retrying...\n"); 527 if (master->trace_enabled) 528 dump_ucode_trace(master); 529 rc = clock_zeros(master, FSI_MASTER_DPOLL_CLOCKS); 530 if (rc) { 531 dev_warn(master->dev, 532 "Error %d clocking zeros for D_POLL\n", rc); 533 break; 534 } 535 if (busy_count++ < FSI_MASTER_MAX_BUSY) { 536 build_dpoll_command(&cmd, slave); 537 rc = send_request(master, &cmd, size); 538 if (rc) { 539 dev_warn(master->dev, "Error %d sending D_POLL\n", rc); 540 break; 541 } 542 goto retry; 543 } 544 dev_dbg(master->dev, 545 "ERR slave is stuck in busy state, issuing TERM\n"); 546 send_term(master, slave); 547 rc = -EIO; 548 break; 549 550 case FSI_RESP_ERRA: 551 dev_dbg(master->dev, "ERRA received\n"); 552 if (master->trace_enabled) 553 dump_ucode_trace(master); 554 rc = -EIO; 555 break; 556 case FSI_RESP_ERRC: 557 dev_dbg(master->dev, "ERRC received\n"); 558 if (master->trace_enabled) 559 dump_ucode_trace(master); 560 rc = -EAGAIN; 561 break; 562 } 563 bail: 564 if (busy_count > 0) { 565 trace_fsi_master_acf_poll_response_busy(master, busy_count); 566 } 567 568 return rc; 569 } 570 571 static int fsi_master_acf_xfer(struct fsi_master_acf *master, uint8_t slave, 572 struct fsi_msg *cmd, size_t resp_len, void *resp) 573 { 574 int rc = -EAGAIN, retries = 0; 575 576 resp_len <<= 3; 577 while ((retries++) < FSI_CRC_ERR_RETRIES) { 578 rc = send_request(master, cmd, resp_len); 579 if (rc) { 580 if (rc != -ESHUTDOWN) 581 dev_warn(master->dev, "Error %d sending command\n", rc); 582 break; 583 } 584 rc = handle_response(master, slave, resp_len, resp); 585 if (rc != -EAGAIN) 586 break; 587 rc = -EIO; 588 dev_dbg(master->dev, "ECRC retry %d\n", retries); 589 590 /* Pace it a bit before retry */ 591 msleep(1); 592 } 593 594 return rc; 595 } 596 597 static int fsi_master_acf_read(struct fsi_master *_master, int link, 598 uint8_t id, uint32_t addr, void *val, 599 size_t size) 600 { 601 struct fsi_master_acf *master = to_fsi_master_acf(_master); 602 struct fsi_msg cmd; 603 int rc; 604 605 if (link != 0) 606 return -ENODEV; 607 608 mutex_lock(&master->lock); 609 dev_dbg(master->dev, "read id %d addr %x size %zd\n", id, addr, size); 610 build_ar_command(master, &cmd, id, addr, size, NULL); 611 rc = fsi_master_acf_xfer(master, id, &cmd, size, val); 612 last_address_update(master, id, rc == 0, addr); 613 if (rc) 614 dev_dbg(master->dev, "read id %d addr 0x%08x err: %d\n", 615 id, addr, rc); 616 mutex_unlock(&master->lock); 617 618 return rc; 619 } 620 621 static int fsi_master_acf_write(struct fsi_master *_master, int link, 622 uint8_t id, uint32_t addr, const void *val, 623 size_t size) 624 { 625 struct fsi_master_acf *master = to_fsi_master_acf(_master); 626 struct fsi_msg cmd; 627 int rc; 628 629 if (link != 0) 630 return -ENODEV; 631 632 mutex_lock(&master->lock); 633 build_ar_command(master, &cmd, id, addr, size, val); 634 dev_dbg(master->dev, "write id %d addr %x size %zd raw_data: %08x\n", 635 id, addr, size, *(uint32_t *)val); 636 rc = fsi_master_acf_xfer(master, id, &cmd, 0, NULL); 637 last_address_update(master, id, rc == 0, addr); 638 if (rc) 639 dev_dbg(master->dev, "write id %d addr 0x%08x err: %d\n", 640 id, addr, rc); 641 mutex_unlock(&master->lock); 642 643 return rc; 644 } 645 646 static int fsi_master_acf_term(struct fsi_master *_master, 647 int link, uint8_t id) 648 { 649 struct fsi_master_acf *master = to_fsi_master_acf(_master); 650 struct fsi_msg cmd; 651 int rc; 652 653 if (link != 0) 654 return -ENODEV; 655 656 mutex_lock(&master->lock); 657 build_term_command(&cmd, id); 658 dev_dbg(master->dev, "term id %d\n", id); 659 rc = fsi_master_acf_xfer(master, id, &cmd, 0, NULL); 660 last_address_update(master, id, false, 0); 661 mutex_unlock(&master->lock); 662 663 return rc; 664 } 665 666 static int fsi_master_acf_break(struct fsi_master *_master, int link) 667 { 668 struct fsi_master_acf *master = to_fsi_master_acf(_master); 669 int rc; 670 671 if (link != 0) 672 return -ENODEV; 673 674 mutex_lock(&master->lock); 675 if (master->external_mode) { 676 mutex_unlock(&master->lock); 677 return -EBUSY; 678 } 679 dev_dbg(master->dev, "sending BREAK\n"); 680 rc = do_copro_command(master, CMD_BREAK); 681 last_address_update(master, 0, false, 0); 682 mutex_unlock(&master->lock); 683 684 /* Wait for logic reset to take effect */ 685 udelay(200); 686 687 return rc; 688 } 689 690 static void reset_cf(struct fsi_master_acf *master) 691 { 692 regmap_write(master->scu, SCU_COPRO_CTRL, SCU_COPRO_RESET); 693 usleep_range(20,20); 694 regmap_write(master->scu, SCU_COPRO_CTRL, 0); 695 usleep_range(20,20); 696 } 697 698 static void start_cf(struct fsi_master_acf *master) 699 { 700 regmap_write(master->scu, SCU_COPRO_CTRL, SCU_COPRO_CLK_EN); 701 } 702 703 static void setup_ast2500_cf_maps(struct fsi_master_acf *master) 704 { 705 /* 706 * Note about byteswap setting: the bus is wired backwards, 707 * so setting the byteswap bit actually makes the ColdFire 708 * work "normally" for a BE processor, ie, put the MSB in 709 * the lowest address byte. 710 * 711 * We thus need to set the bit for our main memory which 712 * contains our program code. We create two mappings for 713 * the register, one with each setting. 714 * 715 * Segments 2 and 3 has a "swapped" mapping (BE) 716 * and 6 and 7 have a non-swapped mapping (LE) which allows 717 * us to avoid byteswapping register accesses since the 718 * registers are all LE. 719 */ 720 721 /* Setup segment 0 to our memory region */ 722 regmap_write(master->scu, SCU_2500_COPRO_SEG0, master->cf_mem_addr | 723 SCU_2500_COPRO_SEG_SWAP); 724 725 /* Segments 2 and 3 to sysregs with byteswap (for SRAM) */ 726 regmap_write(master->scu, SCU_2500_COPRO_SEG2, SYSREG_BASE | 727 SCU_2500_COPRO_SEG_SWAP); 728 regmap_write(master->scu, SCU_2500_COPRO_SEG3, SYSREG_BASE | 0x100000 | 729 SCU_2500_COPRO_SEG_SWAP); 730 731 /* And segment 6 and 7 to sysregs no byteswap */ 732 regmap_write(master->scu, SCU_2500_COPRO_SEG6, SYSREG_BASE); 733 regmap_write(master->scu, SCU_2500_COPRO_SEG7, SYSREG_BASE | 0x100000); 734 735 /* Memory cachable, regs and SRAM not cachable */ 736 regmap_write(master->scu, SCU_2500_COPRO_CACHE_CTL, 737 SCU_2500_COPRO_SEG0_CACHE_EN | SCU_2500_COPRO_CACHE_EN); 738 } 739 740 static void setup_ast2400_cf_maps(struct fsi_master_acf *master) 741 { 742 /* Setup segment 0 to our memory region */ 743 regmap_write(master->scu, SCU_2400_COPRO_SEG0, master->cf_mem_addr | 744 SCU_2400_COPRO_SEG_SWAP); 745 746 /* Segments 2 to sysregs with byteswap (for SRAM) */ 747 regmap_write(master->scu, SCU_2400_COPRO_SEG2, SYSREG_BASE | 748 SCU_2400_COPRO_SEG_SWAP); 749 750 /* And segment 6 to sysregs no byteswap */ 751 regmap_write(master->scu, SCU_2400_COPRO_SEG6, SYSREG_BASE); 752 753 /* Memory cachable, regs and SRAM not cachable */ 754 regmap_write(master->scu, SCU_2400_COPRO_CACHE_CTL, 755 SCU_2400_COPRO_SEG0_CACHE_EN | SCU_2400_COPRO_CACHE_EN); 756 } 757 758 static void setup_common_fw_config(struct fsi_master_acf *master, 759 void __iomem *base) 760 { 761 iowrite16be(master->gpio_clk_vreg, base + HDR_CLOCK_GPIO_VADDR); 762 iowrite16be(master->gpio_clk_dreg, base + HDR_CLOCK_GPIO_DADDR); 763 iowrite16be(master->gpio_dat_vreg, base + HDR_DATA_GPIO_VADDR); 764 iowrite16be(master->gpio_dat_dreg, base + HDR_DATA_GPIO_DADDR); 765 iowrite16be(master->gpio_tra_vreg, base + HDR_TRANS_GPIO_VADDR); 766 iowrite16be(master->gpio_tra_dreg, base + HDR_TRANS_GPIO_DADDR); 767 iowrite8(master->gpio_clk_bit, base + HDR_CLOCK_GPIO_BIT); 768 iowrite8(master->gpio_dat_bit, base + HDR_DATA_GPIO_BIT); 769 iowrite8(master->gpio_tra_bit, base + HDR_TRANS_GPIO_BIT); 770 } 771 772 static void setup_ast2500_fw_config(struct fsi_master_acf *master) 773 { 774 void __iomem *base = master->cf_mem + HDR_OFFSET; 775 776 setup_common_fw_config(master, base); 777 iowrite32be(FW_CONTROL_USE_STOP, base + HDR_FW_CONTROL); 778 } 779 780 static void setup_ast2400_fw_config(struct fsi_master_acf *master) 781 { 782 void __iomem *base = master->cf_mem + HDR_OFFSET; 783 784 setup_common_fw_config(master, base); 785 iowrite32be(FW_CONTROL_CONT_CLOCK|FW_CONTROL_DUMMY_RD, base + HDR_FW_CONTROL); 786 } 787 788 static int setup_gpios_for_copro(struct fsi_master_acf *master) 789 { 790 791 int rc; 792 793 /* This aren't under ColdFire control, just set them up appropriately */ 794 gpiod_direction_output(master->gpio_mux, 1); 795 gpiod_direction_output(master->gpio_enable, 1); 796 797 /* Those are under ColdFire control, let it configure them */ 798 rc = aspeed_gpio_copro_grab_gpio(master->gpio_clk, &master->gpio_clk_vreg, 799 &master->gpio_clk_dreg, &master->gpio_clk_bit); 800 if (rc) { 801 dev_err(master->dev, "failed to assign clock gpio to coprocessor\n"); 802 return rc; 803 } 804 rc = aspeed_gpio_copro_grab_gpio(master->gpio_data, &master->gpio_dat_vreg, 805 &master->gpio_dat_dreg, &master->gpio_dat_bit); 806 if (rc) { 807 dev_err(master->dev, "failed to assign data gpio to coprocessor\n"); 808 aspeed_gpio_copro_release_gpio(master->gpio_clk); 809 return rc; 810 } 811 rc = aspeed_gpio_copro_grab_gpio(master->gpio_trans, &master->gpio_tra_vreg, 812 &master->gpio_tra_dreg, &master->gpio_tra_bit); 813 if (rc) { 814 dev_err(master->dev, "failed to assign trans gpio to coprocessor\n"); 815 aspeed_gpio_copro_release_gpio(master->gpio_clk); 816 aspeed_gpio_copro_release_gpio(master->gpio_data); 817 return rc; 818 } 819 return 0; 820 } 821 822 static void release_copro_gpios(struct fsi_master_acf *master) 823 { 824 aspeed_gpio_copro_release_gpio(master->gpio_clk); 825 aspeed_gpio_copro_release_gpio(master->gpio_data); 826 aspeed_gpio_copro_release_gpio(master->gpio_trans); 827 } 828 829 static int load_copro_firmware(struct fsi_master_acf *master) 830 { 831 const struct firmware *fw; 832 uint16_t sig = 0, wanted_sig; 833 const u8 *data; 834 size_t size = 0; 835 int rc; 836 837 /* Get the binary */ 838 rc = request_firmware(&fw, FW_FILE_NAME, master->dev); 839 if (rc) { 840 dev_err( 841 master->dev, "Error %d to load firmware '%s' !\n", 842 rc, FW_FILE_NAME); 843 return rc; 844 } 845 846 /* Which image do we want ? (shared vs. split clock/data GPIOs) */ 847 if (master->gpio_clk_vreg == master->gpio_dat_vreg) 848 wanted_sig = SYS_SIG_SHARED; 849 else 850 wanted_sig = SYS_SIG_SPLIT; 851 dev_dbg(master->dev, "Looking for image sig %04x\n", wanted_sig); 852 853 /* Try to find it */ 854 for (data = fw->data; data < (fw->data + fw->size);) { 855 sig = be16_to_cpup((__be16 *)(data + HDR_OFFSET + HDR_SYS_SIG)); 856 size = be32_to_cpup((__be32 *)(data + HDR_OFFSET + HDR_FW_SIZE)); 857 if (sig == wanted_sig) 858 break; 859 data += size; 860 } 861 if (sig != wanted_sig) { 862 dev_err(master->dev, "Failed to locate image sig %04x in FW blob\n", 863 wanted_sig); 864 rc = -ENODEV; 865 goto release_fw; 866 } 867 if (size > master->cf_mem_size) { 868 dev_err(master->dev, "FW size (%zd) bigger than memory reserve (%zd)\n", 869 fw->size, master->cf_mem_size); 870 rc = -ENOMEM; 871 } else { 872 memcpy_toio(master->cf_mem, data, size); 873 } 874 875 release_fw: 876 release_firmware(fw); 877 return rc; 878 } 879 880 static int check_firmware_image(struct fsi_master_acf *master) 881 { 882 uint32_t fw_vers, fw_api, fw_options; 883 884 fw_vers = ioread16be(master->cf_mem + HDR_OFFSET + HDR_FW_VERS); 885 fw_api = ioread16be(master->cf_mem + HDR_OFFSET + HDR_API_VERS); 886 fw_options = ioread32be(master->cf_mem + HDR_OFFSET + HDR_FW_OPTIONS); 887 master->trace_enabled = !!(fw_options & FW_OPTION_TRACE_EN); 888 889 /* Check version and signature */ 890 dev_info(master->dev, "ColdFire initialized, firmware v%d API v%d.%d (trace %s)\n", 891 fw_vers, fw_api >> 8, fw_api & 0xff, 892 master->trace_enabled ? "enabled" : "disabled"); 893 894 if ((fw_api >> 8) != API_VERSION_MAJ) { 895 dev_err(master->dev, "Unsupported coprocessor API version !\n"); 896 return -ENODEV; 897 } 898 899 return 0; 900 } 901 902 static int copro_enable_sw_irq(struct fsi_master_acf *master) 903 { 904 int timeout; 905 uint32_t val; 906 907 /* 908 * Enable coprocessor interrupt input. I've had problems getting the 909 * value to stick, so try in a loop 910 */ 911 for (timeout = 0; timeout < 10; timeout++) { 912 iowrite32(0x2, master->cvic + CVIC_EN_REG); 913 val = ioread32(master->cvic + CVIC_EN_REG); 914 if (val & 2) 915 break; 916 msleep(1); 917 } 918 if (!(val & 2)) { 919 dev_err(master->dev, "Failed to enable coprocessor interrupt !\n"); 920 return -ENODEV; 921 } 922 return 0; 923 } 924 925 static int fsi_master_acf_setup(struct fsi_master_acf *master) 926 { 927 int timeout, rc; 928 uint32_t val; 929 930 /* Make sure the ColdFire is stopped */ 931 reset_cf(master); 932 933 /* 934 * Clear SRAM. This needs to happen before we setup the GPIOs 935 * as we might start trying to arbitrate as soon as that happens. 936 */ 937 memset_io(master->sram, 0, SRAM_SIZE); 938 939 /* Configure GPIOs */ 940 rc = setup_gpios_for_copro(master); 941 if (rc) 942 return rc; 943 944 /* Load the firmware into the reserved memory */ 945 rc = load_copro_firmware(master); 946 if (rc) 947 return rc; 948 949 /* Read signature and check versions */ 950 rc = check_firmware_image(master); 951 if (rc) 952 return rc; 953 954 /* Setup coldfire memory map */ 955 if (master->is_ast2500) { 956 setup_ast2500_cf_maps(master); 957 setup_ast2500_fw_config(master); 958 } else { 959 setup_ast2400_cf_maps(master); 960 setup_ast2400_fw_config(master); 961 } 962 963 /* Start the ColdFire */ 964 start_cf(master); 965 966 /* Wait for status register to indicate command completion 967 * which signals the initialization is complete 968 */ 969 for (timeout = 0; timeout < 10; timeout++) { 970 val = ioread8(master->sram + CF_STARTED); 971 if (val) 972 break; 973 msleep(1); 974 } 975 if (!val) { 976 dev_err(master->dev, "Coprocessor startup timeout !\n"); 977 rc = -ENODEV; 978 goto err; 979 } 980 981 /* Configure echo & send delay */ 982 iowrite8(master->t_send_delay, master->sram + SEND_DLY_REG); 983 iowrite8(master->t_echo_delay, master->sram + ECHO_DLY_REG); 984 985 /* Enable SW interrupt to copro if any */ 986 if (master->cvic) { 987 rc = copro_enable_sw_irq(master); 988 if (rc) 989 goto err; 990 } 991 return 0; 992 err: 993 /* An error occurred, don't leave the coprocessor running */ 994 reset_cf(master); 995 996 /* Release the GPIOs */ 997 release_copro_gpios(master); 998 999 return rc; 1000 } 1001 1002 1003 static void fsi_master_acf_terminate(struct fsi_master_acf *master) 1004 { 1005 unsigned long flags; 1006 1007 /* 1008 * A GPIO arbitration requestion could come in while this is 1009 * happening. To avoid problems, we disable interrupts so it 1010 * cannot preempt us on this CPU 1011 */ 1012 1013 local_irq_save(flags); 1014 1015 /* Stop the coprocessor */ 1016 reset_cf(master); 1017 1018 /* We mark the copro not-started */ 1019 iowrite32(0, master->sram + CF_STARTED); 1020 1021 /* We mark the ARB register as having given up arbitration to 1022 * deal with a potential race with the arbitration request 1023 */ 1024 iowrite8(ARB_ARM_ACK, master->sram + ARB_REG); 1025 1026 local_irq_restore(flags); 1027 1028 /* Return the GPIOs to the ARM */ 1029 release_copro_gpios(master); 1030 } 1031 1032 static void fsi_master_acf_setup_external(struct fsi_master_acf *master) 1033 { 1034 /* Setup GPIOs for external FSI master (FSP box) */ 1035 gpiod_direction_output(master->gpio_mux, 0); 1036 gpiod_direction_output(master->gpio_trans, 0); 1037 gpiod_direction_output(master->gpio_enable, 1); 1038 gpiod_direction_input(master->gpio_clk); 1039 gpiod_direction_input(master->gpio_data); 1040 } 1041 1042 static int fsi_master_acf_link_enable(struct fsi_master *_master, int link, 1043 bool enable) 1044 { 1045 struct fsi_master_acf *master = to_fsi_master_acf(_master); 1046 int rc = -EBUSY; 1047 1048 if (link != 0) 1049 return -ENODEV; 1050 1051 mutex_lock(&master->lock); 1052 if (!master->external_mode) { 1053 gpiod_set_value(master->gpio_enable, enable ? 1 : 0); 1054 rc = 0; 1055 } 1056 mutex_unlock(&master->lock); 1057 1058 return rc; 1059 } 1060 1061 static int fsi_master_acf_link_config(struct fsi_master *_master, int link, 1062 u8 t_send_delay, u8 t_echo_delay) 1063 { 1064 struct fsi_master_acf *master = to_fsi_master_acf(_master); 1065 1066 if (link != 0) 1067 return -ENODEV; 1068 1069 mutex_lock(&master->lock); 1070 master->t_send_delay = t_send_delay; 1071 master->t_echo_delay = t_echo_delay; 1072 dev_dbg(master->dev, "Changing delays: send=%d echo=%d\n", 1073 t_send_delay, t_echo_delay); 1074 iowrite8(master->t_send_delay, master->sram + SEND_DLY_REG); 1075 iowrite8(master->t_echo_delay, master->sram + ECHO_DLY_REG); 1076 mutex_unlock(&master->lock); 1077 1078 return 0; 1079 } 1080 1081 static ssize_t external_mode_show(struct device *dev, 1082 struct device_attribute *attr, char *buf) 1083 { 1084 struct fsi_master_acf *master = dev_get_drvdata(dev); 1085 1086 return snprintf(buf, PAGE_SIZE - 1, "%u\n", 1087 master->external_mode ? 1 : 0); 1088 } 1089 1090 static ssize_t external_mode_store(struct device *dev, 1091 struct device_attribute *attr, const char *buf, size_t count) 1092 { 1093 struct fsi_master_acf *master = dev_get_drvdata(dev); 1094 unsigned long val; 1095 bool external_mode; 1096 int err; 1097 1098 err = kstrtoul(buf, 0, &val); 1099 if (err) 1100 return err; 1101 1102 external_mode = !!val; 1103 1104 mutex_lock(&master->lock); 1105 1106 if (external_mode == master->external_mode) { 1107 mutex_unlock(&master->lock); 1108 return count; 1109 } 1110 1111 master->external_mode = external_mode; 1112 if (master->external_mode) { 1113 fsi_master_acf_terminate(master); 1114 fsi_master_acf_setup_external(master); 1115 } else 1116 fsi_master_acf_setup(master); 1117 1118 mutex_unlock(&master->lock); 1119 1120 fsi_master_rescan(&master->master); 1121 1122 return count; 1123 } 1124 1125 static DEVICE_ATTR(external_mode, 0664, 1126 external_mode_show, external_mode_store); 1127 1128 static int fsi_master_acf_gpio_request(void *data) 1129 { 1130 struct fsi_master_acf *master = data; 1131 int timeout; 1132 u8 val; 1133 1134 /* Note: This doesn't require holding out mutex */ 1135 1136 /* Write reqest */ 1137 iowrite8(ARB_ARM_REQ, master->sram + ARB_REG); 1138 1139 /* 1140 * There is a race (which does happen at boot time) when we get an 1141 * arbitration request as we are either about to or just starting 1142 * the coprocessor. 1143 * 1144 * To handle it, we first check if we are running. If not yet we 1145 * check whether the copro is started in the SCU. 1146 * 1147 * If it's not started, we can basically just assume we have arbitration 1148 * and return. Otherwise, we wait normally expecting for the arbitration 1149 * to eventually complete. 1150 */ 1151 if (ioread32(master->sram + CF_STARTED) == 0) { 1152 unsigned int reg = 0; 1153 1154 regmap_read(master->scu, SCU_COPRO_CTRL, ®); 1155 if (!(reg & SCU_COPRO_CLK_EN)) 1156 return 0; 1157 } 1158 1159 /* Ring doorbell if any */ 1160 if (master->cvic) 1161 iowrite32(0x2, master->cvic + CVIC_TRIG_REG); 1162 1163 for (timeout = 0; timeout < 10000; timeout++) { 1164 val = ioread8(master->sram + ARB_REG); 1165 if (val != ARB_ARM_REQ) 1166 break; 1167 udelay(1); 1168 } 1169 1170 /* If it failed, override anyway */ 1171 if (val != ARB_ARM_ACK) 1172 dev_warn(master->dev, "GPIO request arbitration timeout\n"); 1173 1174 return 0; 1175 } 1176 1177 static int fsi_master_acf_gpio_release(void *data) 1178 { 1179 struct fsi_master_acf *master = data; 1180 1181 /* Write release */ 1182 iowrite8(0, master->sram + ARB_REG); 1183 1184 /* Ring doorbell if any */ 1185 if (master->cvic) 1186 iowrite32(0x2, master->cvic + CVIC_TRIG_REG); 1187 1188 return 0; 1189 } 1190 1191 static void fsi_master_acf_release(struct device *dev) 1192 { 1193 struct fsi_master_acf *master = to_fsi_master_acf(dev_to_fsi_master(dev)); 1194 1195 /* Cleanup, stop coprocessor */ 1196 mutex_lock(&master->lock); 1197 fsi_master_acf_terminate(master); 1198 aspeed_gpio_copro_set_ops(NULL, NULL); 1199 mutex_unlock(&master->lock); 1200 1201 /* Free resources */ 1202 gen_pool_free(master->sram_pool, (unsigned long)master->sram, SRAM_SIZE); 1203 of_node_put(dev_of_node(master->dev)); 1204 1205 kfree(master); 1206 } 1207 1208 static const struct aspeed_gpio_copro_ops fsi_master_acf_gpio_ops = { 1209 .request_access = fsi_master_acf_gpio_request, 1210 .release_access = fsi_master_acf_gpio_release, 1211 }; 1212 1213 static int fsi_master_acf_probe(struct platform_device *pdev) 1214 { 1215 struct device_node *np, *mnode = dev_of_node(&pdev->dev); 1216 struct genpool_data_fixed gpdf; 1217 struct fsi_master_acf *master; 1218 struct gpio_desc *gpio; 1219 struct resource res; 1220 uint32_t cf_mem_align; 1221 int rc; 1222 1223 master = kzalloc(sizeof(*master), GFP_KERNEL); 1224 if (!master) 1225 return -ENOMEM; 1226 1227 master->dev = &pdev->dev; 1228 master->master.dev.parent = master->dev; 1229 master->last_addr = LAST_ADDR_INVALID; 1230 1231 /* AST2400 vs. AST2500 */ 1232 master->is_ast2500 = of_device_is_compatible(mnode, "aspeed,ast2500-cf-fsi-master"); 1233 1234 /* Grab the SCU, we'll need to access it to configure the coprocessor */ 1235 if (master->is_ast2500) 1236 master->scu = syscon_regmap_lookup_by_compatible("aspeed,ast2500-scu"); 1237 else 1238 master->scu = syscon_regmap_lookup_by_compatible("aspeed,ast2400-scu"); 1239 if (IS_ERR(master->scu)) { 1240 dev_err(&pdev->dev, "failed to find SCU regmap\n"); 1241 rc = PTR_ERR(master->scu); 1242 goto err_free; 1243 } 1244 1245 /* Grab all the GPIOs we need */ 1246 gpio = devm_gpiod_get(&pdev->dev, "clock", 0); 1247 if (IS_ERR(gpio)) { 1248 dev_err(&pdev->dev, "failed to get clock gpio\n"); 1249 rc = PTR_ERR(gpio); 1250 goto err_free; 1251 } 1252 master->gpio_clk = gpio; 1253 1254 gpio = devm_gpiod_get(&pdev->dev, "data", 0); 1255 if (IS_ERR(gpio)) { 1256 dev_err(&pdev->dev, "failed to get data gpio\n"); 1257 rc = PTR_ERR(gpio); 1258 goto err_free; 1259 } 1260 master->gpio_data = gpio; 1261 1262 /* Optional GPIOs */ 1263 gpio = devm_gpiod_get_optional(&pdev->dev, "trans", 0); 1264 if (IS_ERR(gpio)) { 1265 dev_err(&pdev->dev, "failed to get trans gpio\n"); 1266 rc = PTR_ERR(gpio); 1267 goto err_free; 1268 } 1269 master->gpio_trans = gpio; 1270 1271 gpio = devm_gpiod_get_optional(&pdev->dev, "enable", 0); 1272 if (IS_ERR(gpio)) { 1273 dev_err(&pdev->dev, "failed to get enable gpio\n"); 1274 rc = PTR_ERR(gpio); 1275 goto err_free; 1276 } 1277 master->gpio_enable = gpio; 1278 1279 gpio = devm_gpiod_get_optional(&pdev->dev, "mux", 0); 1280 if (IS_ERR(gpio)) { 1281 dev_err(&pdev->dev, "failed to get mux gpio\n"); 1282 rc = PTR_ERR(gpio); 1283 goto err_free; 1284 } 1285 master->gpio_mux = gpio; 1286 1287 /* Grab the reserved memory region (use DMA API instead ?) */ 1288 np = of_parse_phandle(mnode, "memory-region", 0); 1289 if (!np) { 1290 dev_err(&pdev->dev, "Didn't find reserved memory\n"); 1291 rc = -EINVAL; 1292 goto err_free; 1293 } 1294 rc = of_address_to_resource(np, 0, &res); 1295 of_node_put(np); 1296 if (rc) { 1297 dev_err(&pdev->dev, "Couldn't address to resource for reserved memory\n"); 1298 rc = -ENOMEM; 1299 goto err_free; 1300 } 1301 master->cf_mem_size = resource_size(&res); 1302 master->cf_mem_addr = (uint32_t)res.start; 1303 cf_mem_align = master->is_ast2500 ? 0x00100000 : 0x00200000; 1304 if (master->cf_mem_addr & (cf_mem_align - 1)) { 1305 dev_err(&pdev->dev, "Reserved memory has insufficient alignment\n"); 1306 rc = -ENOMEM; 1307 goto err_free; 1308 } 1309 master->cf_mem = devm_ioremap_resource(&pdev->dev, &res); 1310 if (IS_ERR(master->cf_mem)) { 1311 rc = PTR_ERR(master->cf_mem); 1312 goto err_free; 1313 } 1314 dev_dbg(&pdev->dev, "DRAM allocation @%x\n", master->cf_mem_addr); 1315 1316 /* AST2500 has a SW interrupt to the coprocessor */ 1317 if (master->is_ast2500) { 1318 /* Grab the CVIC (ColdFire interrupts controller) */ 1319 np = of_parse_phandle(mnode, "aspeed,cvic", 0); 1320 if (!np) { 1321 dev_err(&pdev->dev, "Didn't find CVIC\n"); 1322 rc = -EINVAL; 1323 goto err_free; 1324 } 1325 master->cvic = devm_of_iomap(&pdev->dev, np, 0, NULL); 1326 if (IS_ERR(master->cvic)) { 1327 rc = PTR_ERR(master->cvic); 1328 dev_err(&pdev->dev, "Error %d mapping CVIC\n", rc); 1329 goto err_free; 1330 } 1331 rc = of_property_read_u32(np, "copro-sw-interrupts", 1332 &master->cvic_sw_irq); 1333 if (rc) { 1334 dev_err(&pdev->dev, "Can't find coprocessor SW interrupt\n"); 1335 goto err_free; 1336 } 1337 } 1338 1339 /* Grab the SRAM */ 1340 master->sram_pool = of_gen_pool_get(dev_of_node(&pdev->dev), "aspeed,sram", 0); 1341 if (!master->sram_pool) { 1342 rc = -ENODEV; 1343 dev_err(&pdev->dev, "Can't find sram pool\n"); 1344 goto err_free; 1345 } 1346 1347 /* Current microcode only deals with fixed location in SRAM */ 1348 gpdf.offset = 0; 1349 master->sram = (void __iomem *)gen_pool_alloc_algo(master->sram_pool, SRAM_SIZE, 1350 gen_pool_fixed_alloc, &gpdf); 1351 if (!master->sram) { 1352 rc = -ENOMEM; 1353 dev_err(&pdev->dev, "Failed to allocate sram from pool\n"); 1354 goto err_free; 1355 } 1356 dev_dbg(&pdev->dev, "SRAM allocation @%lx\n", 1357 (unsigned long)gen_pool_virt_to_phys(master->sram_pool, 1358 (unsigned long)master->sram)); 1359 1360 /* 1361 * Hookup with the GPIO driver for arbitration of GPIO banks 1362 * ownership. 1363 */ 1364 aspeed_gpio_copro_set_ops(&fsi_master_acf_gpio_ops, master); 1365 1366 /* Default FSI command delays */ 1367 master->t_send_delay = FSI_SEND_DELAY_CLOCKS; 1368 master->t_echo_delay = FSI_ECHO_DELAY_CLOCKS; 1369 master->master.n_links = 1; 1370 if (master->is_ast2500) 1371 master->master.flags = FSI_MASTER_FLAG_SWCLOCK; 1372 master->master.read = fsi_master_acf_read; 1373 master->master.write = fsi_master_acf_write; 1374 master->master.term = fsi_master_acf_term; 1375 master->master.send_break = fsi_master_acf_break; 1376 master->master.link_enable = fsi_master_acf_link_enable; 1377 master->master.link_config = fsi_master_acf_link_config; 1378 master->master.dev.of_node = of_node_get(dev_of_node(master->dev)); 1379 master->master.dev.release = fsi_master_acf_release; 1380 platform_set_drvdata(pdev, master); 1381 mutex_init(&master->lock); 1382 1383 mutex_lock(&master->lock); 1384 rc = fsi_master_acf_setup(master); 1385 mutex_unlock(&master->lock); 1386 if (rc) 1387 goto release_of_dev; 1388 1389 rc = device_create_file(&pdev->dev, &dev_attr_external_mode); 1390 if (rc) 1391 goto stop_copro; 1392 1393 rc = fsi_master_register(&master->master); 1394 if (!rc) 1395 return 0; 1396 1397 device_remove_file(master->dev, &dev_attr_external_mode); 1398 put_device(&master->master.dev); 1399 return rc; 1400 1401 stop_copro: 1402 fsi_master_acf_terminate(master); 1403 release_of_dev: 1404 aspeed_gpio_copro_set_ops(NULL, NULL); 1405 gen_pool_free(master->sram_pool, (unsigned long)master->sram, SRAM_SIZE); 1406 of_node_put(dev_of_node(master->dev)); 1407 err_free: 1408 kfree(master); 1409 return rc; 1410 } 1411 1412 1413 static int fsi_master_acf_remove(struct platform_device *pdev) 1414 { 1415 struct fsi_master_acf *master = platform_get_drvdata(pdev); 1416 1417 device_remove_file(master->dev, &dev_attr_external_mode); 1418 1419 fsi_master_unregister(&master->master); 1420 1421 return 0; 1422 } 1423 1424 static const struct of_device_id fsi_master_acf_match[] = { 1425 { .compatible = "aspeed,ast2400-cf-fsi-master" }, 1426 { .compatible = "aspeed,ast2500-cf-fsi-master" }, 1427 { }, 1428 }; 1429 MODULE_DEVICE_TABLE(of, fsi_master_acf_match); 1430 1431 static struct platform_driver fsi_master_acf = { 1432 .driver = { 1433 .name = "fsi-master-acf", 1434 .of_match_table = fsi_master_acf_match, 1435 }, 1436 .probe = fsi_master_acf_probe, 1437 .remove = fsi_master_acf_remove, 1438 }; 1439 1440 module_platform_driver(fsi_master_acf); 1441 MODULE_LICENSE("GPL"); 1442