1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * ASPEED FMC/SPI Memory Controller Driver 4 * 5 * Copyright (c) 2015-2022, IBM Corporation. 6 * Copyright (c) 2020, ASPEED Corporation. 7 */ 8 9 #include <linux/clk.h> 10 #include <linux/module.h> 11 #include <linux/of.h> 12 #include <linux/of_platform.h> 13 #include <linux/platform_device.h> 14 #include <linux/spi/spi.h> 15 #include <linux/spi/spi-mem.h> 16 17 #define DEVICE_NAME "spi-aspeed-smc" 18 19 /* Type setting Register */ 20 #define CONFIG_REG 0x0 21 #define CONFIG_TYPE_SPI 0x2 22 23 /* CE Control Register */ 24 #define CE_CTRL_REG 0x4 25 26 /* CEx Control Register */ 27 #define CE0_CTRL_REG 0x10 28 #define CTRL_IO_MODE_MASK GENMASK(30, 28) 29 #define CTRL_IO_SINGLE_DATA 0x0 30 #define CTRL_IO_DUAL_DATA BIT(29) 31 #define CTRL_IO_QUAD_DATA BIT(30) 32 #define CTRL_COMMAND_SHIFT 16 33 #define CTRL_IO_ADDRESS_4B BIT(13) /* AST2400 SPI only */ 34 #define CTRL_IO_DUMMY_SET(dummy) \ 35 (((((dummy) >> 2) & 0x1) << 14) | (((dummy) & 0x3) << 6)) 36 #define CTRL_FREQ_SEL_SHIFT 8 37 #define CTRL_FREQ_SEL_MASK GENMASK(11, CTRL_FREQ_SEL_SHIFT) 38 #define CTRL_CE_STOP_ACTIVE BIT(2) 39 #define CTRL_IO_MODE_CMD_MASK GENMASK(1, 0) 40 #define CTRL_IO_MODE_NORMAL 0x0 41 #define CTRL_IO_MODE_READ 0x1 42 #define CTRL_IO_MODE_WRITE 0x2 43 #define CTRL_IO_MODE_USER 0x3 44 45 #define CTRL_IO_CMD_MASK 0xf0ff40c3 46 47 /* CEx Address Decoding Range Register */ 48 #define CE0_SEGMENT_ADDR_REG 0x30 49 50 /* CEx Read timing compensation register */ 51 #define CE0_TIMING_COMPENSATION_REG 0x94 52 53 enum aspeed_spi_ctl_reg_value { 54 ASPEED_SPI_BASE, 55 ASPEED_SPI_READ, 56 ASPEED_SPI_WRITE, 57 ASPEED_SPI_MAX, 58 }; 59 60 struct aspeed_spi; 61 62 struct aspeed_spi_chip { 63 struct aspeed_spi *aspi; 64 u32 cs; 65 void __iomem *ctl; 66 void __iomem *ahb_base; 67 u32 ahb_window_size; 68 u32 ctl_val[ASPEED_SPI_MAX]; 69 u32 clk_freq; 70 }; 71 72 struct aspeed_spi_data { 73 u32 ctl0; 74 u32 max_cs; 75 bool hastype; 76 u32 mode_bits; 77 u32 we0; 78 u32 timing; 79 u32 hclk_mask; 80 u32 hdiv_max; 81 82 u32 (*segment_start)(struct aspeed_spi *aspi, u32 reg); 83 u32 (*segment_end)(struct aspeed_spi *aspi, u32 reg); 84 u32 (*segment_reg)(struct aspeed_spi *aspi, u32 start, u32 end); 85 int (*calibrate)(struct aspeed_spi_chip *chip, u32 hdiv, 86 const u8 *golden_buf, u8 *test_buf); 87 }; 88 89 #define ASPEED_SPI_MAX_NUM_CS 5 90 91 struct aspeed_spi { 92 const struct aspeed_spi_data *data; 93 94 void __iomem *regs; 95 void __iomem *ahb_base; 96 u32 ahb_base_phy; 97 u32 ahb_window_size; 98 struct device *dev; 99 100 struct clk *clk; 101 u32 clk_freq; 102 103 struct aspeed_spi_chip chips[ASPEED_SPI_MAX_NUM_CS]; 104 }; 105 106 static u32 aspeed_spi_get_io_mode(const struct spi_mem_op *op) 107 { 108 switch (op->data.buswidth) { 109 case 1: 110 return CTRL_IO_SINGLE_DATA; 111 case 2: 112 return CTRL_IO_DUAL_DATA; 113 case 4: 114 return CTRL_IO_QUAD_DATA; 115 default: 116 return CTRL_IO_SINGLE_DATA; 117 } 118 } 119 120 static void aspeed_spi_set_io_mode(struct aspeed_spi_chip *chip, u32 io_mode) 121 { 122 u32 ctl; 123 124 if (io_mode > 0) { 125 ctl = readl(chip->ctl) & ~CTRL_IO_MODE_MASK; 126 ctl |= io_mode; 127 writel(ctl, chip->ctl); 128 } 129 } 130 131 static void aspeed_spi_start_user(struct aspeed_spi_chip *chip) 132 { 133 u32 ctl = chip->ctl_val[ASPEED_SPI_BASE]; 134 135 ctl |= CTRL_IO_MODE_USER | CTRL_CE_STOP_ACTIVE; 136 writel(ctl, chip->ctl); 137 138 ctl &= ~CTRL_CE_STOP_ACTIVE; 139 writel(ctl, chip->ctl); 140 } 141 142 static void aspeed_spi_stop_user(struct aspeed_spi_chip *chip) 143 { 144 u32 ctl = chip->ctl_val[ASPEED_SPI_READ] | 145 CTRL_IO_MODE_USER | CTRL_CE_STOP_ACTIVE; 146 147 writel(ctl, chip->ctl); 148 149 /* Restore defaults */ 150 writel(chip->ctl_val[ASPEED_SPI_READ], chip->ctl); 151 } 152 153 static int aspeed_spi_read_from_ahb(void *buf, void __iomem *src, size_t len) 154 { 155 size_t offset = 0; 156 157 if (IS_ALIGNED((uintptr_t)src, sizeof(uintptr_t)) && 158 IS_ALIGNED((uintptr_t)buf, sizeof(uintptr_t))) { 159 ioread32_rep(src, buf, len >> 2); 160 offset = len & ~0x3; 161 len -= offset; 162 } 163 ioread8_rep(src, (u8 *)buf + offset, len); 164 return 0; 165 } 166 167 static int aspeed_spi_write_to_ahb(void __iomem *dst, const void *buf, size_t len) 168 { 169 size_t offset = 0; 170 171 if (IS_ALIGNED((uintptr_t)dst, sizeof(uintptr_t)) && 172 IS_ALIGNED((uintptr_t)buf, sizeof(uintptr_t))) { 173 iowrite32_rep(dst, buf, len >> 2); 174 offset = len & ~0x3; 175 len -= offset; 176 } 177 iowrite8_rep(dst, (const u8 *)buf + offset, len); 178 return 0; 179 } 180 181 static int aspeed_spi_send_cmd_addr(struct aspeed_spi_chip *chip, u8 addr_nbytes, 182 u64 offset, u32 opcode) 183 { 184 __be32 temp; 185 u32 cmdaddr; 186 187 switch (addr_nbytes) { 188 case 3: 189 cmdaddr = offset & 0xFFFFFF; 190 cmdaddr |= opcode << 24; 191 192 temp = cpu_to_be32(cmdaddr); 193 aspeed_spi_write_to_ahb(chip->ahb_base, &temp, 4); 194 break; 195 case 4: 196 temp = cpu_to_be32(offset); 197 aspeed_spi_write_to_ahb(chip->ahb_base, &opcode, 1); 198 aspeed_spi_write_to_ahb(chip->ahb_base, &temp, 4); 199 break; 200 default: 201 WARN_ONCE(1, "Unexpected address width %u", addr_nbytes); 202 return -EOPNOTSUPP; 203 } 204 return 0; 205 } 206 207 static int aspeed_spi_read_reg(struct aspeed_spi_chip *chip, 208 const struct spi_mem_op *op) 209 { 210 aspeed_spi_start_user(chip); 211 aspeed_spi_write_to_ahb(chip->ahb_base, &op->cmd.opcode, 1); 212 aspeed_spi_read_from_ahb(op->data.buf.in, 213 chip->ahb_base, op->data.nbytes); 214 aspeed_spi_stop_user(chip); 215 return 0; 216 } 217 218 static int aspeed_spi_write_reg(struct aspeed_spi_chip *chip, 219 const struct spi_mem_op *op) 220 { 221 aspeed_spi_start_user(chip); 222 aspeed_spi_write_to_ahb(chip->ahb_base, &op->cmd.opcode, 1); 223 aspeed_spi_write_to_ahb(chip->ahb_base, op->data.buf.out, 224 op->data.nbytes); 225 aspeed_spi_stop_user(chip); 226 return 0; 227 } 228 229 static ssize_t aspeed_spi_read_user(struct aspeed_spi_chip *chip, 230 const struct spi_mem_op *op, 231 u64 offset, size_t len, void *buf) 232 { 233 int io_mode = aspeed_spi_get_io_mode(op); 234 u8 dummy = 0xFF; 235 int i; 236 int ret; 237 238 aspeed_spi_start_user(chip); 239 240 ret = aspeed_spi_send_cmd_addr(chip, op->addr.nbytes, offset, op->cmd.opcode); 241 if (ret < 0) 242 return ret; 243 244 if (op->dummy.buswidth && op->dummy.nbytes) { 245 for (i = 0; i < op->dummy.nbytes / op->dummy.buswidth; i++) 246 aspeed_spi_write_to_ahb(chip->ahb_base, &dummy, sizeof(dummy)); 247 } 248 249 aspeed_spi_set_io_mode(chip, io_mode); 250 251 aspeed_spi_read_from_ahb(buf, chip->ahb_base, len); 252 aspeed_spi_stop_user(chip); 253 return 0; 254 } 255 256 static ssize_t aspeed_spi_write_user(struct aspeed_spi_chip *chip, 257 const struct spi_mem_op *op) 258 { 259 int ret; 260 261 aspeed_spi_start_user(chip); 262 ret = aspeed_spi_send_cmd_addr(chip, op->addr.nbytes, op->addr.val, op->cmd.opcode); 263 if (ret < 0) 264 return ret; 265 aspeed_spi_write_to_ahb(chip->ahb_base, op->data.buf.out, op->data.nbytes); 266 aspeed_spi_stop_user(chip); 267 return 0; 268 } 269 270 /* support for 1-1-1, 1-1-2 or 1-1-4 */ 271 static bool aspeed_spi_supports_op(struct spi_mem *mem, const struct spi_mem_op *op) 272 { 273 if (op->cmd.buswidth > 1) 274 return false; 275 276 if (op->addr.nbytes != 0) { 277 if (op->addr.buswidth > 1) 278 return false; 279 if (op->addr.nbytes < 3 || op->addr.nbytes > 4) 280 return false; 281 } 282 283 if (op->dummy.nbytes != 0) { 284 if (op->dummy.buswidth > 1 || op->dummy.nbytes > 7) 285 return false; 286 } 287 288 if (op->data.nbytes != 0 && op->data.buswidth > 4) 289 return false; 290 291 return spi_mem_default_supports_op(mem, op); 292 } 293 294 static const struct aspeed_spi_data ast2400_spi_data; 295 296 static int do_aspeed_spi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op) 297 { 298 struct aspeed_spi *aspi = spi_controller_get_devdata(mem->spi->controller); 299 struct aspeed_spi_chip *chip = &aspi->chips[spi_get_chipselect(mem->spi, 0)]; 300 u32 addr_mode, addr_mode_backup; 301 u32 ctl_val; 302 int ret = 0; 303 304 dev_dbg(aspi->dev, 305 "CE%d %s OP %#x mode:%d.%d.%d.%d naddr:%#x ndummies:%#x len:%#x", 306 chip->cs, op->data.dir == SPI_MEM_DATA_IN ? "read" : "write", 307 op->cmd.opcode, op->cmd.buswidth, op->addr.buswidth, 308 op->dummy.buswidth, op->data.buswidth, 309 op->addr.nbytes, op->dummy.nbytes, op->data.nbytes); 310 311 addr_mode = readl(aspi->regs + CE_CTRL_REG); 312 addr_mode_backup = addr_mode; 313 314 ctl_val = chip->ctl_val[ASPEED_SPI_BASE]; 315 ctl_val &= ~CTRL_IO_CMD_MASK; 316 317 ctl_val |= op->cmd.opcode << CTRL_COMMAND_SHIFT; 318 319 /* 4BYTE address mode */ 320 if (op->addr.nbytes) { 321 if (op->addr.nbytes == 4) 322 addr_mode |= (0x11 << chip->cs); 323 else 324 addr_mode &= ~(0x11 << chip->cs); 325 326 if (op->addr.nbytes == 4 && chip->aspi->data == &ast2400_spi_data) 327 ctl_val |= CTRL_IO_ADDRESS_4B; 328 } 329 330 if (op->dummy.nbytes) 331 ctl_val |= CTRL_IO_DUMMY_SET(op->dummy.nbytes / op->dummy.buswidth); 332 333 if (op->data.nbytes) 334 ctl_val |= aspeed_spi_get_io_mode(op); 335 336 if (op->data.dir == SPI_MEM_DATA_OUT) 337 ctl_val |= CTRL_IO_MODE_WRITE; 338 else 339 ctl_val |= CTRL_IO_MODE_READ; 340 341 if (addr_mode != addr_mode_backup) 342 writel(addr_mode, aspi->regs + CE_CTRL_REG); 343 writel(ctl_val, chip->ctl); 344 345 if (op->data.dir == SPI_MEM_DATA_IN) { 346 if (!op->addr.nbytes) 347 ret = aspeed_spi_read_reg(chip, op); 348 else 349 ret = aspeed_spi_read_user(chip, op, op->addr.val, 350 op->data.nbytes, op->data.buf.in); 351 } else { 352 if (!op->addr.nbytes) 353 ret = aspeed_spi_write_reg(chip, op); 354 else 355 ret = aspeed_spi_write_user(chip, op); 356 } 357 358 /* Restore defaults */ 359 if (addr_mode != addr_mode_backup) 360 writel(addr_mode_backup, aspi->regs + CE_CTRL_REG); 361 writel(chip->ctl_val[ASPEED_SPI_READ], chip->ctl); 362 return ret; 363 } 364 365 static int aspeed_spi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op) 366 { 367 int ret; 368 369 ret = do_aspeed_spi_exec_op(mem, op); 370 if (ret) 371 dev_err(&mem->spi->dev, "operation failed: %d\n", ret); 372 return ret; 373 } 374 375 static const char *aspeed_spi_get_name(struct spi_mem *mem) 376 { 377 struct aspeed_spi *aspi = spi_controller_get_devdata(mem->spi->controller); 378 struct device *dev = aspi->dev; 379 380 return devm_kasprintf(dev, GFP_KERNEL, "%s.%d", dev_name(dev), 381 spi_get_chipselect(mem->spi, 0)); 382 } 383 384 struct aspeed_spi_window { 385 u32 cs; 386 u32 offset; 387 u32 size; 388 }; 389 390 static void aspeed_spi_get_windows(struct aspeed_spi *aspi, 391 struct aspeed_spi_window windows[ASPEED_SPI_MAX_NUM_CS]) 392 { 393 const struct aspeed_spi_data *data = aspi->data; 394 u32 reg_val; 395 u32 cs; 396 397 for (cs = 0; cs < aspi->data->max_cs; cs++) { 398 reg_val = readl(aspi->regs + CE0_SEGMENT_ADDR_REG + cs * 4); 399 windows[cs].cs = cs; 400 windows[cs].size = data->segment_end(aspi, reg_val) - 401 data->segment_start(aspi, reg_val); 402 windows[cs].offset = data->segment_start(aspi, reg_val) - aspi->ahb_base_phy; 403 dev_vdbg(aspi->dev, "CE%d offset=0x%.8x size=0x%x\n", cs, 404 windows[cs].offset, windows[cs].size); 405 } 406 } 407 408 /* 409 * On the AST2600, some CE windows are closed by default at reset but 410 * U-Boot should open all. 411 */ 412 static int aspeed_spi_chip_set_default_window(struct aspeed_spi_chip *chip) 413 { 414 struct aspeed_spi *aspi = chip->aspi; 415 struct aspeed_spi_window windows[ASPEED_SPI_MAX_NUM_CS] = { 0 }; 416 struct aspeed_spi_window *win = &windows[chip->cs]; 417 418 /* No segment registers for the AST2400 SPI controller */ 419 if (aspi->data == &ast2400_spi_data) { 420 win->offset = 0; 421 win->size = aspi->ahb_window_size; 422 } else { 423 aspeed_spi_get_windows(aspi, windows); 424 } 425 426 chip->ahb_base = aspi->ahb_base + win->offset; 427 chip->ahb_window_size = win->size; 428 429 dev_dbg(aspi->dev, "CE%d default window [ 0x%.8x - 0x%.8x ] %dMB", 430 chip->cs, aspi->ahb_base_phy + win->offset, 431 aspi->ahb_base_phy + win->offset + win->size - 1, 432 win->size >> 20); 433 434 return chip->ahb_window_size ? 0 : -1; 435 } 436 437 static int aspeed_spi_set_window(struct aspeed_spi *aspi, 438 const struct aspeed_spi_window *win) 439 { 440 u32 start = aspi->ahb_base_phy + win->offset; 441 u32 end = start + win->size; 442 void __iomem *seg_reg = aspi->regs + CE0_SEGMENT_ADDR_REG + win->cs * 4; 443 u32 seg_val_backup = readl(seg_reg); 444 u32 seg_val = aspi->data->segment_reg(aspi, start, end); 445 446 if (seg_val == seg_val_backup) 447 return 0; 448 449 writel(seg_val, seg_reg); 450 451 /* 452 * Restore initial value if something goes wrong else we could 453 * loose access to the chip. 454 */ 455 if (seg_val != readl(seg_reg)) { 456 dev_err(aspi->dev, "CE%d invalid window [ 0x%.8x - 0x%.8x ] %dMB", 457 win->cs, start, end - 1, win->size >> 20); 458 writel(seg_val_backup, seg_reg); 459 return -EIO; 460 } 461 462 if (win->size) 463 dev_dbg(aspi->dev, "CE%d new window [ 0x%.8x - 0x%.8x ] %dMB", 464 win->cs, start, end - 1, win->size >> 20); 465 else 466 dev_dbg(aspi->dev, "CE%d window closed", win->cs); 467 468 return 0; 469 } 470 471 /* 472 * Yet to be done when possible : 473 * - Align mappings on flash size (we don't have the info) 474 * - ioremap each window, not strictly necessary since the overall window 475 * is correct. 476 */ 477 static const struct aspeed_spi_data ast2500_spi_data; 478 static const struct aspeed_spi_data ast2600_spi_data; 479 static const struct aspeed_spi_data ast2600_fmc_data; 480 481 static int aspeed_spi_chip_adjust_window(struct aspeed_spi_chip *chip, 482 u32 local_offset, u32 size) 483 { 484 struct aspeed_spi *aspi = chip->aspi; 485 struct aspeed_spi_window windows[ASPEED_SPI_MAX_NUM_CS] = { 0 }; 486 struct aspeed_spi_window *win = &windows[chip->cs]; 487 int ret; 488 489 /* No segment registers for the AST2400 SPI controller */ 490 if (aspi->data == &ast2400_spi_data) 491 return 0; 492 493 /* 494 * Due to an HW issue on the AST2500 SPI controller, the CE0 495 * window size should be smaller than the maximum 128MB. 496 */ 497 if (aspi->data == &ast2500_spi_data && chip->cs == 0 && size == SZ_128M) { 498 size = 120 << 20; 499 dev_info(aspi->dev, "CE%d window resized to %dMB (AST2500 HW quirk)", 500 chip->cs, size >> 20); 501 } 502 503 /* 504 * The decoding size of AST2600 SPI controller should set at 505 * least 2MB. 506 */ 507 if ((aspi->data == &ast2600_spi_data || aspi->data == &ast2600_fmc_data) && 508 size < SZ_2M) { 509 size = SZ_2M; 510 dev_info(aspi->dev, "CE%d window resized to %dMB (AST2600 Decoding)", 511 chip->cs, size >> 20); 512 } 513 514 aspeed_spi_get_windows(aspi, windows); 515 516 /* Adjust this chip window */ 517 win->offset += local_offset; 518 win->size = size; 519 520 if (win->offset + win->size > aspi->ahb_window_size) { 521 win->size = aspi->ahb_window_size - win->offset; 522 dev_warn(aspi->dev, "CE%d window resized to %dMB", chip->cs, win->size >> 20); 523 } 524 525 ret = aspeed_spi_set_window(aspi, win); 526 if (ret) 527 return ret; 528 529 /* Update chip mapping info */ 530 chip->ahb_base = aspi->ahb_base + win->offset; 531 chip->ahb_window_size = win->size; 532 533 /* 534 * Also adjust next chip window to make sure that it does not 535 * overlap with the current window. 536 */ 537 if (chip->cs < aspi->data->max_cs - 1) { 538 struct aspeed_spi_window *next = &windows[chip->cs + 1]; 539 540 /* Change offset and size to keep the same end address */ 541 if ((next->offset + next->size) > (win->offset + win->size)) 542 next->size = (next->offset + next->size) - (win->offset + win->size); 543 else 544 next->size = 0; 545 next->offset = win->offset + win->size; 546 547 aspeed_spi_set_window(aspi, next); 548 } 549 return 0; 550 } 551 552 static int aspeed_spi_do_calibration(struct aspeed_spi_chip *chip); 553 554 static int aspeed_spi_dirmap_create(struct spi_mem_dirmap_desc *desc) 555 { 556 struct aspeed_spi *aspi = spi_controller_get_devdata(desc->mem->spi->controller); 557 struct aspeed_spi_chip *chip = &aspi->chips[spi_get_chipselect(desc->mem->spi, 0)]; 558 struct spi_mem_op *op = &desc->info.op_tmpl; 559 u32 ctl_val; 560 int ret = 0; 561 562 dev_dbg(aspi->dev, 563 "CE%d %s dirmap [ 0x%.8llx - 0x%.8llx ] OP %#x mode:%d.%d.%d.%d naddr:%#x ndummies:%#x\n", 564 chip->cs, op->data.dir == SPI_MEM_DATA_IN ? "read" : "write", 565 desc->info.offset, desc->info.offset + desc->info.length, 566 op->cmd.opcode, op->cmd.buswidth, op->addr.buswidth, 567 op->dummy.buswidth, op->data.buswidth, 568 op->addr.nbytes, op->dummy.nbytes); 569 570 chip->clk_freq = desc->mem->spi->max_speed_hz; 571 572 /* Only for reads */ 573 if (op->data.dir != SPI_MEM_DATA_IN) 574 return -EOPNOTSUPP; 575 576 aspeed_spi_chip_adjust_window(chip, desc->info.offset, desc->info.length); 577 578 if (desc->info.length > chip->ahb_window_size) 579 dev_warn(aspi->dev, "CE%d window (%dMB) too small for mapping", 580 chip->cs, chip->ahb_window_size >> 20); 581 582 /* Define the default IO read settings */ 583 ctl_val = readl(chip->ctl) & ~CTRL_IO_CMD_MASK; 584 ctl_val |= aspeed_spi_get_io_mode(op) | 585 op->cmd.opcode << CTRL_COMMAND_SHIFT | 586 CTRL_IO_MODE_READ; 587 588 if (op->dummy.nbytes) 589 ctl_val |= CTRL_IO_DUMMY_SET(op->dummy.nbytes / op->dummy.buswidth); 590 591 /* Tune 4BYTE address mode */ 592 if (op->addr.nbytes) { 593 u32 addr_mode = readl(aspi->regs + CE_CTRL_REG); 594 595 if (op->addr.nbytes == 4) 596 addr_mode |= (0x11 << chip->cs); 597 else 598 addr_mode &= ~(0x11 << chip->cs); 599 writel(addr_mode, aspi->regs + CE_CTRL_REG); 600 601 /* AST2400 SPI controller sets 4BYTE address mode in 602 * CE0 Control Register 603 */ 604 if (op->addr.nbytes == 4 && chip->aspi->data == &ast2400_spi_data) 605 ctl_val |= CTRL_IO_ADDRESS_4B; 606 } 607 608 /* READ mode is the controller default setting */ 609 chip->ctl_val[ASPEED_SPI_READ] = ctl_val; 610 writel(chip->ctl_val[ASPEED_SPI_READ], chip->ctl); 611 612 ret = aspeed_spi_do_calibration(chip); 613 614 dev_info(aspi->dev, "CE%d read buswidth:%d [0x%08x]\n", 615 chip->cs, op->data.buswidth, chip->ctl_val[ASPEED_SPI_READ]); 616 617 return ret; 618 } 619 620 static ssize_t aspeed_spi_dirmap_read(struct spi_mem_dirmap_desc *desc, 621 u64 offset, size_t len, void *buf) 622 { 623 struct aspeed_spi *aspi = spi_controller_get_devdata(desc->mem->spi->controller); 624 struct aspeed_spi_chip *chip = &aspi->chips[spi_get_chipselect(desc->mem->spi, 0)]; 625 626 /* Switch to USER command mode if mapping window is too small */ 627 if (chip->ahb_window_size < offset + len) { 628 int ret; 629 630 ret = aspeed_spi_read_user(chip, &desc->info.op_tmpl, offset, len, buf); 631 if (ret < 0) 632 return ret; 633 } else { 634 memcpy_fromio(buf, chip->ahb_base + offset, len); 635 } 636 637 return len; 638 } 639 640 static const struct spi_controller_mem_ops aspeed_spi_mem_ops = { 641 .supports_op = aspeed_spi_supports_op, 642 .exec_op = aspeed_spi_exec_op, 643 .get_name = aspeed_spi_get_name, 644 .dirmap_create = aspeed_spi_dirmap_create, 645 .dirmap_read = aspeed_spi_dirmap_read, 646 }; 647 648 static void aspeed_spi_chip_set_type(struct aspeed_spi *aspi, unsigned int cs, int type) 649 { 650 u32 reg; 651 652 reg = readl(aspi->regs + CONFIG_REG); 653 reg &= ~(0x3 << (cs * 2)); 654 reg |= type << (cs * 2); 655 writel(reg, aspi->regs + CONFIG_REG); 656 } 657 658 static void aspeed_spi_chip_enable(struct aspeed_spi *aspi, unsigned int cs, bool enable) 659 { 660 u32 we_bit = BIT(aspi->data->we0 + cs); 661 u32 reg = readl(aspi->regs + CONFIG_REG); 662 663 if (enable) 664 reg |= we_bit; 665 else 666 reg &= ~we_bit; 667 writel(reg, aspi->regs + CONFIG_REG); 668 } 669 670 static int aspeed_spi_setup(struct spi_device *spi) 671 { 672 struct aspeed_spi *aspi = spi_controller_get_devdata(spi->controller); 673 const struct aspeed_spi_data *data = aspi->data; 674 unsigned int cs = spi_get_chipselect(spi, 0); 675 struct aspeed_spi_chip *chip = &aspi->chips[cs]; 676 677 chip->aspi = aspi; 678 chip->cs = cs; 679 chip->ctl = aspi->regs + data->ctl0 + cs * 4; 680 681 /* The driver only supports SPI type flash */ 682 if (data->hastype) 683 aspeed_spi_chip_set_type(aspi, cs, CONFIG_TYPE_SPI); 684 685 if (aspeed_spi_chip_set_default_window(chip) < 0) { 686 dev_warn(aspi->dev, "CE%d window invalid", cs); 687 return -EINVAL; 688 } 689 690 aspeed_spi_chip_enable(aspi, cs, true); 691 692 chip->ctl_val[ASPEED_SPI_BASE] = CTRL_CE_STOP_ACTIVE | CTRL_IO_MODE_USER; 693 694 dev_dbg(aspi->dev, "CE%d setup done\n", cs); 695 return 0; 696 } 697 698 static void aspeed_spi_cleanup(struct spi_device *spi) 699 { 700 struct aspeed_spi *aspi = spi_controller_get_devdata(spi->controller); 701 unsigned int cs = spi_get_chipselect(spi, 0); 702 703 aspeed_spi_chip_enable(aspi, cs, false); 704 705 dev_dbg(aspi->dev, "CE%d cleanup done\n", cs); 706 } 707 708 static void aspeed_spi_enable(struct aspeed_spi *aspi, bool enable) 709 { 710 int cs; 711 712 for (cs = 0; cs < aspi->data->max_cs; cs++) 713 aspeed_spi_chip_enable(aspi, cs, enable); 714 } 715 716 static int aspeed_spi_probe(struct platform_device *pdev) 717 { 718 struct device *dev = &pdev->dev; 719 const struct aspeed_spi_data *data; 720 struct spi_controller *ctlr; 721 struct aspeed_spi *aspi; 722 struct resource *res; 723 int ret; 724 725 data = of_device_get_match_data(&pdev->dev); 726 if (!data) 727 return -ENODEV; 728 729 ctlr = devm_spi_alloc_host(dev, sizeof(*aspi)); 730 if (!ctlr) 731 return -ENOMEM; 732 733 aspi = spi_controller_get_devdata(ctlr); 734 platform_set_drvdata(pdev, aspi); 735 aspi->data = data; 736 aspi->dev = dev; 737 738 aspi->regs = devm_platform_ioremap_resource(pdev, 0); 739 if (IS_ERR(aspi->regs)) 740 return PTR_ERR(aspi->regs); 741 742 aspi->ahb_base = devm_platform_get_and_ioremap_resource(pdev, 1, &res); 743 if (IS_ERR(aspi->ahb_base)) { 744 dev_err(dev, "missing AHB mapping window\n"); 745 return PTR_ERR(aspi->ahb_base); 746 } 747 748 aspi->ahb_window_size = resource_size(res); 749 aspi->ahb_base_phy = res->start; 750 751 aspi->clk = devm_clk_get(&pdev->dev, NULL); 752 if (IS_ERR(aspi->clk)) { 753 dev_err(dev, "missing clock\n"); 754 return PTR_ERR(aspi->clk); 755 } 756 757 aspi->clk_freq = clk_get_rate(aspi->clk); 758 if (!aspi->clk_freq) { 759 dev_err(dev, "invalid clock\n"); 760 return -EINVAL; 761 } 762 763 ret = clk_prepare_enable(aspi->clk); 764 if (ret) { 765 dev_err(dev, "can not enable the clock\n"); 766 return ret; 767 } 768 769 /* IRQ is for DMA, which the driver doesn't support yet */ 770 771 ctlr->mode_bits = SPI_RX_DUAL | SPI_TX_DUAL | data->mode_bits; 772 ctlr->bus_num = pdev->id; 773 ctlr->mem_ops = &aspeed_spi_mem_ops; 774 ctlr->setup = aspeed_spi_setup; 775 ctlr->cleanup = aspeed_spi_cleanup; 776 ctlr->num_chipselect = data->max_cs; 777 ctlr->dev.of_node = dev->of_node; 778 779 ret = devm_spi_register_controller(dev, ctlr); 780 if (ret) { 781 dev_err(&pdev->dev, "spi_register_controller failed\n"); 782 goto disable_clk; 783 } 784 return 0; 785 786 disable_clk: 787 clk_disable_unprepare(aspi->clk); 788 return ret; 789 } 790 791 static void aspeed_spi_remove(struct platform_device *pdev) 792 { 793 struct aspeed_spi *aspi = platform_get_drvdata(pdev); 794 795 aspeed_spi_enable(aspi, false); 796 clk_disable_unprepare(aspi->clk); 797 } 798 799 /* 800 * AHB mappings 801 */ 802 803 /* 804 * The Segment Registers of the AST2400 and AST2500 use a 8MB unit. 805 * The address range is encoded with absolute addresses in the overall 806 * mapping window. 807 */ 808 static u32 aspeed_spi_segment_start(struct aspeed_spi *aspi, u32 reg) 809 { 810 return ((reg >> 16) & 0xFF) << 23; 811 } 812 813 static u32 aspeed_spi_segment_end(struct aspeed_spi *aspi, u32 reg) 814 { 815 return ((reg >> 24) & 0xFF) << 23; 816 } 817 818 static u32 aspeed_spi_segment_reg(struct aspeed_spi *aspi, u32 start, u32 end) 819 { 820 return (((start >> 23) & 0xFF) << 16) | (((end >> 23) & 0xFF) << 24); 821 } 822 823 /* 824 * The Segment Registers of the AST2600 use a 1MB unit. The address 825 * range is encoded with offsets in the overall mapping window. 826 */ 827 828 #define AST2600_SEG_ADDR_MASK 0x0ff00000 829 830 static u32 aspeed_spi_segment_ast2600_start(struct aspeed_spi *aspi, 831 u32 reg) 832 { 833 u32 start_offset = (reg << 16) & AST2600_SEG_ADDR_MASK; 834 835 return aspi->ahb_base_phy + start_offset; 836 } 837 838 static u32 aspeed_spi_segment_ast2600_end(struct aspeed_spi *aspi, 839 u32 reg) 840 { 841 u32 end_offset = reg & AST2600_SEG_ADDR_MASK; 842 843 /* segment is disabled */ 844 if (!end_offset) 845 return aspi->ahb_base_phy; 846 847 return aspi->ahb_base_phy + end_offset + 0x100000; 848 } 849 850 static u32 aspeed_spi_segment_ast2600_reg(struct aspeed_spi *aspi, 851 u32 start, u32 end) 852 { 853 /* disable zero size segments */ 854 if (start == end) 855 return 0; 856 857 return ((start & AST2600_SEG_ADDR_MASK) >> 16) | 858 ((end - 1) & AST2600_SEG_ADDR_MASK); 859 } 860 861 /* 862 * Read timing compensation sequences 863 */ 864 865 #define CALIBRATE_BUF_SIZE SZ_16K 866 867 static bool aspeed_spi_check_reads(struct aspeed_spi_chip *chip, 868 const u8 *golden_buf, u8 *test_buf) 869 { 870 int i; 871 872 for (i = 0; i < 10; i++) { 873 memcpy_fromio(test_buf, chip->ahb_base, CALIBRATE_BUF_SIZE); 874 if (memcmp(test_buf, golden_buf, CALIBRATE_BUF_SIZE) != 0) { 875 #if defined(VERBOSE_DEBUG) 876 print_hex_dump_bytes(DEVICE_NAME " fail: ", DUMP_PREFIX_NONE, 877 test_buf, 0x100); 878 #endif 879 return false; 880 } 881 } 882 return true; 883 } 884 885 #define FREAD_TPASS(i) (((i) / 2) | (((i) & 1) ? 0 : 8)) 886 887 /* 888 * The timing register is shared by all devices. Only update for CE0. 889 */ 890 static int aspeed_spi_calibrate(struct aspeed_spi_chip *chip, u32 hdiv, 891 const u8 *golden_buf, u8 *test_buf) 892 { 893 struct aspeed_spi *aspi = chip->aspi; 894 const struct aspeed_spi_data *data = aspi->data; 895 int i; 896 int good_pass = -1, pass_count = 0; 897 u32 shift = (hdiv - 1) << 2; 898 u32 mask = ~(0xfu << shift); 899 u32 fread_timing_val = 0; 900 901 /* Try HCLK delay 0..5, each one with/without delay and look for a 902 * good pair. 903 */ 904 for (i = 0; i < 12; i++) { 905 bool pass; 906 907 if (chip->cs == 0) { 908 fread_timing_val &= mask; 909 fread_timing_val |= FREAD_TPASS(i) << shift; 910 writel(fread_timing_val, aspi->regs + data->timing); 911 } 912 pass = aspeed_spi_check_reads(chip, golden_buf, test_buf); 913 dev_dbg(aspi->dev, 914 " * [%08x] %d HCLK delay, %dns DI delay : %s", 915 fread_timing_val, i / 2, (i & 1) ? 0 : 4, 916 pass ? "PASS" : "FAIL"); 917 if (pass) { 918 pass_count++; 919 if (pass_count == 3) { 920 good_pass = i - 1; 921 break; 922 } 923 } else { 924 pass_count = 0; 925 } 926 } 927 928 /* No good setting for this frequency */ 929 if (good_pass < 0) 930 return -1; 931 932 /* We have at least one pass of margin, let's use first pass */ 933 if (chip->cs == 0) { 934 fread_timing_val &= mask; 935 fread_timing_val |= FREAD_TPASS(good_pass) << shift; 936 writel(fread_timing_val, aspi->regs + data->timing); 937 } 938 dev_dbg(aspi->dev, " * -> good is pass %d [0x%08x]", 939 good_pass, fread_timing_val); 940 return 0; 941 } 942 943 static bool aspeed_spi_check_calib_data(const u8 *test_buf, u32 size) 944 { 945 const u32 *tb32 = (const u32 *)test_buf; 946 u32 i, cnt = 0; 947 948 /* We check if we have enough words that are neither all 0 949 * nor all 1's so the calibration can be considered valid. 950 * 951 * I use an arbitrary threshold for now of 64 952 */ 953 size >>= 2; 954 for (i = 0; i < size; i++) { 955 if (tb32[i] != 0 && tb32[i] != 0xffffffff) 956 cnt++; 957 } 958 return cnt >= 64; 959 } 960 961 static const u32 aspeed_spi_hclk_divs[] = { 962 0xf, /* HCLK */ 963 0x7, /* HCLK/2 */ 964 0xe, /* HCLK/3 */ 965 0x6, /* HCLK/4 */ 966 0xd, /* HCLK/5 */ 967 }; 968 969 #define ASPEED_SPI_HCLK_DIV(i) \ 970 (aspeed_spi_hclk_divs[(i) - 1] << CTRL_FREQ_SEL_SHIFT) 971 972 static int aspeed_spi_do_calibration(struct aspeed_spi_chip *chip) 973 { 974 struct aspeed_spi *aspi = chip->aspi; 975 const struct aspeed_spi_data *data = aspi->data; 976 u32 ahb_freq = aspi->clk_freq; 977 u32 max_freq = chip->clk_freq; 978 u32 ctl_val; 979 u8 *golden_buf = NULL; 980 u8 *test_buf = NULL; 981 int i, rc, best_div = -1; 982 983 dev_dbg(aspi->dev, "calculate timing compensation - AHB freq: %d MHz", 984 ahb_freq / 1000000); 985 986 /* 987 * use the related low frequency to get check calibration data 988 * and get golden data. 989 */ 990 ctl_val = chip->ctl_val[ASPEED_SPI_READ] & data->hclk_mask; 991 writel(ctl_val, chip->ctl); 992 993 test_buf = kzalloc(CALIBRATE_BUF_SIZE * 2, GFP_KERNEL); 994 if (!test_buf) 995 return -ENOMEM; 996 997 golden_buf = test_buf + CALIBRATE_BUF_SIZE; 998 999 memcpy_fromio(golden_buf, chip->ahb_base, CALIBRATE_BUF_SIZE); 1000 if (!aspeed_spi_check_calib_data(golden_buf, CALIBRATE_BUF_SIZE)) { 1001 dev_info(aspi->dev, "Calibration area too uniform, using low speed"); 1002 goto no_calib; 1003 } 1004 1005 #if defined(VERBOSE_DEBUG) 1006 print_hex_dump_bytes(DEVICE_NAME " good: ", DUMP_PREFIX_NONE, 1007 golden_buf, 0x100); 1008 #endif 1009 1010 /* Now we iterate the HCLK dividers until we find our breaking point */ 1011 for (i = ARRAY_SIZE(aspeed_spi_hclk_divs); i > data->hdiv_max - 1; i--) { 1012 u32 tv, freq; 1013 1014 freq = ahb_freq / i; 1015 if (freq > max_freq) 1016 continue; 1017 1018 /* Set the timing */ 1019 tv = chip->ctl_val[ASPEED_SPI_READ] | ASPEED_SPI_HCLK_DIV(i); 1020 writel(tv, chip->ctl); 1021 dev_dbg(aspi->dev, "Trying HCLK/%d [%08x] ...", i, tv); 1022 rc = data->calibrate(chip, i, golden_buf, test_buf); 1023 if (rc == 0) 1024 best_div = i; 1025 } 1026 1027 /* Nothing found ? */ 1028 if (best_div < 0) { 1029 dev_warn(aspi->dev, "No good frequency, using dumb slow"); 1030 } else { 1031 dev_dbg(aspi->dev, "Found good read timings at HCLK/%d", best_div); 1032 1033 /* Record the freq */ 1034 for (i = 0; i < ASPEED_SPI_MAX; i++) 1035 chip->ctl_val[i] = (chip->ctl_val[i] & data->hclk_mask) | 1036 ASPEED_SPI_HCLK_DIV(best_div); 1037 } 1038 1039 no_calib: 1040 writel(chip->ctl_val[ASPEED_SPI_READ], chip->ctl); 1041 kfree(test_buf); 1042 return 0; 1043 } 1044 1045 #define TIMING_DELAY_DI BIT(3) 1046 #define TIMING_DELAY_HCYCLE_MAX 5 1047 #define TIMING_REG_AST2600(chip) \ 1048 ((chip)->aspi->regs + (chip)->aspi->data->timing + \ 1049 (chip)->cs * 4) 1050 1051 static int aspeed_spi_ast2600_calibrate(struct aspeed_spi_chip *chip, u32 hdiv, 1052 const u8 *golden_buf, u8 *test_buf) 1053 { 1054 struct aspeed_spi *aspi = chip->aspi; 1055 int hcycle; 1056 u32 shift = (hdiv - 2) << 3; 1057 u32 mask = ~(0xfu << shift); 1058 u32 fread_timing_val = 0; 1059 1060 for (hcycle = 0; hcycle <= TIMING_DELAY_HCYCLE_MAX; hcycle++) { 1061 int delay_ns; 1062 bool pass = false; 1063 1064 fread_timing_val &= mask; 1065 fread_timing_val |= hcycle << shift; 1066 1067 /* no DI input delay first */ 1068 writel(fread_timing_val, TIMING_REG_AST2600(chip)); 1069 pass = aspeed_spi_check_reads(chip, golden_buf, test_buf); 1070 dev_dbg(aspi->dev, 1071 " * [%08x] %d HCLK delay, DI delay none : %s", 1072 fread_timing_val, hcycle, pass ? "PASS" : "FAIL"); 1073 if (pass) 1074 return 0; 1075 1076 /* Add DI input delays */ 1077 fread_timing_val &= mask; 1078 fread_timing_val |= (TIMING_DELAY_DI | hcycle) << shift; 1079 1080 for (delay_ns = 0; delay_ns < 0x10; delay_ns++) { 1081 fread_timing_val &= ~(0xf << (4 + shift)); 1082 fread_timing_val |= delay_ns << (4 + shift); 1083 1084 writel(fread_timing_val, TIMING_REG_AST2600(chip)); 1085 pass = aspeed_spi_check_reads(chip, golden_buf, test_buf); 1086 dev_dbg(aspi->dev, 1087 " * [%08x] %d HCLK delay, DI delay %d.%dns : %s", 1088 fread_timing_val, hcycle, (delay_ns + 1) / 2, 1089 (delay_ns + 1) & 1 ? 5 : 5, pass ? "PASS" : "FAIL"); 1090 /* 1091 * TODO: This is optimistic. We should look 1092 * for a working interval and save the middle 1093 * value in the read timing register. 1094 */ 1095 if (pass) 1096 return 0; 1097 } 1098 } 1099 1100 /* No good setting for this frequency */ 1101 return -1; 1102 } 1103 1104 /* 1105 * Platform definitions 1106 */ 1107 static const struct aspeed_spi_data ast2400_fmc_data = { 1108 .max_cs = 5, 1109 .hastype = true, 1110 .we0 = 16, 1111 .ctl0 = CE0_CTRL_REG, 1112 .timing = CE0_TIMING_COMPENSATION_REG, 1113 .hclk_mask = 0xfffff0ff, 1114 .hdiv_max = 1, 1115 .calibrate = aspeed_spi_calibrate, 1116 .segment_start = aspeed_spi_segment_start, 1117 .segment_end = aspeed_spi_segment_end, 1118 .segment_reg = aspeed_spi_segment_reg, 1119 }; 1120 1121 static const struct aspeed_spi_data ast2400_spi_data = { 1122 .max_cs = 1, 1123 .hastype = false, 1124 .we0 = 0, 1125 .ctl0 = 0x04, 1126 .timing = 0x14, 1127 .hclk_mask = 0xfffff0ff, 1128 .hdiv_max = 1, 1129 .calibrate = aspeed_spi_calibrate, 1130 /* No segment registers */ 1131 }; 1132 1133 static const struct aspeed_spi_data ast2500_fmc_data = { 1134 .max_cs = 3, 1135 .hastype = true, 1136 .we0 = 16, 1137 .ctl0 = CE0_CTRL_REG, 1138 .timing = CE0_TIMING_COMPENSATION_REG, 1139 .hclk_mask = 0xffffd0ff, 1140 .hdiv_max = 1, 1141 .calibrate = aspeed_spi_calibrate, 1142 .segment_start = aspeed_spi_segment_start, 1143 .segment_end = aspeed_spi_segment_end, 1144 .segment_reg = aspeed_spi_segment_reg, 1145 }; 1146 1147 static const struct aspeed_spi_data ast2500_spi_data = { 1148 .max_cs = 2, 1149 .hastype = false, 1150 .we0 = 16, 1151 .ctl0 = CE0_CTRL_REG, 1152 .timing = CE0_TIMING_COMPENSATION_REG, 1153 .hclk_mask = 0xffffd0ff, 1154 .hdiv_max = 1, 1155 .calibrate = aspeed_spi_calibrate, 1156 .segment_start = aspeed_spi_segment_start, 1157 .segment_end = aspeed_spi_segment_end, 1158 .segment_reg = aspeed_spi_segment_reg, 1159 }; 1160 1161 static const struct aspeed_spi_data ast2600_fmc_data = { 1162 .max_cs = 3, 1163 .hastype = false, 1164 .mode_bits = SPI_RX_QUAD | SPI_TX_QUAD, 1165 .we0 = 16, 1166 .ctl0 = CE0_CTRL_REG, 1167 .timing = CE0_TIMING_COMPENSATION_REG, 1168 .hclk_mask = 0xf0fff0ff, 1169 .hdiv_max = 2, 1170 .calibrate = aspeed_spi_ast2600_calibrate, 1171 .segment_start = aspeed_spi_segment_ast2600_start, 1172 .segment_end = aspeed_spi_segment_ast2600_end, 1173 .segment_reg = aspeed_spi_segment_ast2600_reg, 1174 }; 1175 1176 static const struct aspeed_spi_data ast2600_spi_data = { 1177 .max_cs = 2, 1178 .hastype = false, 1179 .mode_bits = SPI_RX_QUAD | SPI_TX_QUAD, 1180 .we0 = 16, 1181 .ctl0 = CE0_CTRL_REG, 1182 .timing = CE0_TIMING_COMPENSATION_REG, 1183 .hclk_mask = 0xf0fff0ff, 1184 .hdiv_max = 2, 1185 .calibrate = aspeed_spi_ast2600_calibrate, 1186 .segment_start = aspeed_spi_segment_ast2600_start, 1187 .segment_end = aspeed_spi_segment_ast2600_end, 1188 .segment_reg = aspeed_spi_segment_ast2600_reg, 1189 }; 1190 1191 static const struct of_device_id aspeed_spi_matches[] = { 1192 { .compatible = "aspeed,ast2400-fmc", .data = &ast2400_fmc_data }, 1193 { .compatible = "aspeed,ast2400-spi", .data = &ast2400_spi_data }, 1194 { .compatible = "aspeed,ast2500-fmc", .data = &ast2500_fmc_data }, 1195 { .compatible = "aspeed,ast2500-spi", .data = &ast2500_spi_data }, 1196 { .compatible = "aspeed,ast2600-fmc", .data = &ast2600_fmc_data }, 1197 { .compatible = "aspeed,ast2600-spi", .data = &ast2600_spi_data }, 1198 { } 1199 }; 1200 MODULE_DEVICE_TABLE(of, aspeed_spi_matches); 1201 1202 static struct platform_driver aspeed_spi_driver = { 1203 .probe = aspeed_spi_probe, 1204 .remove_new = aspeed_spi_remove, 1205 .driver = { 1206 .name = DEVICE_NAME, 1207 .of_match_table = aspeed_spi_matches, 1208 } 1209 }; 1210 1211 module_platform_driver(aspeed_spi_driver); 1212 1213 MODULE_DESCRIPTION("ASPEED Static Memory Controller Driver"); 1214 MODULE_AUTHOR("Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>"); 1215 MODULE_AUTHOR("Cedric Le Goater <clg@kaod.org>"); 1216 MODULE_LICENSE("GPL v2"); 1217