1 // SPDX-License-Identifier: GPL-2.0-only 2 /* linux/drivers/mfd/sm501.c 3 * 4 * Copyright (C) 2006 Simtec Electronics 5 * Ben Dooks <ben@simtec.co.uk> 6 * Vincent Sanders <vince@simtec.co.uk> 7 * 8 * SM501 MFD driver 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/delay.h> 14 #include <linux/init.h> 15 #include <linux/list.h> 16 #include <linux/device.h> 17 #include <linux/platform_device.h> 18 #include <linux/pci.h> 19 #include <linux/platform_data/i2c-gpio.h> 20 #include <linux/gpio/driver.h> 21 #include <linux/gpio/machine.h> 22 #include <linux/slab.h> 23 24 #include <linux/sm501.h> 25 #include <linux/sm501-regs.h> 26 #include <linux/serial_8250.h> 27 28 #include <linux/io.h> 29 30 struct sm501_device { 31 struct list_head list; 32 struct platform_device pdev; 33 }; 34 35 struct sm501_gpio; 36 37 #ifdef CONFIG_MFD_SM501_GPIO 38 #include <linux/gpio.h> 39 40 struct sm501_gpio_chip { 41 struct gpio_chip gpio; 42 struct sm501_gpio *ourgpio; /* to get back to parent. */ 43 void __iomem *regbase; 44 void __iomem *control; /* address of control reg. */ 45 }; 46 47 struct sm501_gpio { 48 struct sm501_gpio_chip low; 49 struct sm501_gpio_chip high; 50 spinlock_t lock; 51 52 unsigned int registered : 1; 53 void __iomem *regs; 54 struct resource *regs_res; 55 }; 56 #else 57 struct sm501_gpio { 58 /* no gpio support, empty definition for sm501_devdata. */ 59 }; 60 #endif 61 62 struct sm501_devdata { 63 spinlock_t reg_lock; 64 struct mutex clock_lock; 65 struct list_head devices; 66 struct sm501_gpio gpio; 67 68 struct device *dev; 69 struct resource *io_res; 70 struct resource *mem_res; 71 struct resource *regs_claim; 72 struct sm501_platdata *platdata; 73 74 75 unsigned int in_suspend; 76 unsigned long pm_misc; 77 78 int unit_power[20]; 79 unsigned int pdev_id; 80 unsigned int irq; 81 void __iomem *regs; 82 unsigned int rev; 83 }; 84 85 86 #define MHZ (1000 * 1000) 87 88 #ifdef DEBUG 89 static const unsigned int div_tab[] = { 90 [0] = 1, 91 [1] = 2, 92 [2] = 4, 93 [3] = 8, 94 [4] = 16, 95 [5] = 32, 96 [6] = 64, 97 [7] = 128, 98 [8] = 3, 99 [9] = 6, 100 [10] = 12, 101 [11] = 24, 102 [12] = 48, 103 [13] = 96, 104 [14] = 192, 105 [15] = 384, 106 [16] = 5, 107 [17] = 10, 108 [18] = 20, 109 [19] = 40, 110 [20] = 80, 111 [21] = 160, 112 [22] = 320, 113 [23] = 604, 114 }; 115 116 static unsigned long decode_div(unsigned long pll2, unsigned long val, 117 unsigned int lshft, unsigned int selbit, 118 unsigned long mask) 119 { 120 if (val & selbit) 121 pll2 = 288 * MHZ; 122 123 return pll2 / div_tab[(val >> lshft) & mask]; 124 } 125 126 #define fmt_freq(x) ((x) / MHZ), ((x) % MHZ), (x) 127 128 /* sm501_dump_clk 129 * 130 * Print out the current clock configuration for the device 131 */ 132 133 static void sm501_dump_clk(struct sm501_devdata *sm) 134 { 135 unsigned long misct = smc501_readl(sm->regs + SM501_MISC_TIMING); 136 unsigned long pm0 = smc501_readl(sm->regs + SM501_POWER_MODE_0_CLOCK); 137 unsigned long pm1 = smc501_readl(sm->regs + SM501_POWER_MODE_1_CLOCK); 138 unsigned long pmc = smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL); 139 unsigned long sdclk0, sdclk1; 140 unsigned long pll2 = 0; 141 142 switch (misct & 0x30) { 143 case 0x00: 144 pll2 = 336 * MHZ; 145 break; 146 case 0x10: 147 pll2 = 288 * MHZ; 148 break; 149 case 0x20: 150 pll2 = 240 * MHZ; 151 break; 152 case 0x30: 153 pll2 = 192 * MHZ; 154 break; 155 } 156 157 sdclk0 = (misct & (1<<12)) ? pll2 : 288 * MHZ; 158 sdclk0 /= div_tab[((misct >> 8) & 0xf)]; 159 160 sdclk1 = (misct & (1<<20)) ? pll2 : 288 * MHZ; 161 sdclk1 /= div_tab[((misct >> 16) & 0xf)]; 162 163 dev_dbg(sm->dev, "MISCT=%08lx, PM0=%08lx, PM1=%08lx\n", 164 misct, pm0, pm1); 165 166 dev_dbg(sm->dev, "PLL2 = %ld.%ld MHz (%ld), SDCLK0=%08lx, SDCLK1=%08lx\n", 167 fmt_freq(pll2), sdclk0, sdclk1); 168 169 dev_dbg(sm->dev, "SDRAM: PM0=%ld, PM1=%ld\n", sdclk0, sdclk1); 170 171 dev_dbg(sm->dev, "PM0[%c]: " 172 "P2 %ld.%ld MHz (%ld), V2 %ld.%ld (%ld), " 173 "M %ld.%ld (%ld), MX1 %ld.%ld (%ld)\n", 174 (pmc & 3 ) == 0 ? '*' : '-', 175 fmt_freq(decode_div(pll2, pm0, 24, 1<<29, 31)), 176 fmt_freq(decode_div(pll2, pm0, 16, 1<<20, 15)), 177 fmt_freq(decode_div(pll2, pm0, 8, 1<<12, 15)), 178 fmt_freq(decode_div(pll2, pm0, 0, 1<<4, 15))); 179 180 dev_dbg(sm->dev, "PM1[%c]: " 181 "P2 %ld.%ld MHz (%ld), V2 %ld.%ld (%ld), " 182 "M %ld.%ld (%ld), MX1 %ld.%ld (%ld)\n", 183 (pmc & 3 ) == 1 ? '*' : '-', 184 fmt_freq(decode_div(pll2, pm1, 24, 1<<29, 31)), 185 fmt_freq(decode_div(pll2, pm1, 16, 1<<20, 15)), 186 fmt_freq(decode_div(pll2, pm1, 8, 1<<12, 15)), 187 fmt_freq(decode_div(pll2, pm1, 0, 1<<4, 15))); 188 } 189 190 static void sm501_dump_regs(struct sm501_devdata *sm) 191 { 192 void __iomem *regs = sm->regs; 193 194 dev_info(sm->dev, "System Control %08x\n", 195 smc501_readl(regs + SM501_SYSTEM_CONTROL)); 196 dev_info(sm->dev, "Misc Control %08x\n", 197 smc501_readl(regs + SM501_MISC_CONTROL)); 198 dev_info(sm->dev, "GPIO Control Low %08x\n", 199 smc501_readl(regs + SM501_GPIO31_0_CONTROL)); 200 dev_info(sm->dev, "GPIO Control Hi %08x\n", 201 smc501_readl(regs + SM501_GPIO63_32_CONTROL)); 202 dev_info(sm->dev, "DRAM Control %08x\n", 203 smc501_readl(regs + SM501_DRAM_CONTROL)); 204 dev_info(sm->dev, "Arbitration Ctrl %08x\n", 205 smc501_readl(regs + SM501_ARBTRTN_CONTROL)); 206 dev_info(sm->dev, "Misc Timing %08x\n", 207 smc501_readl(regs + SM501_MISC_TIMING)); 208 } 209 210 static void sm501_dump_gate(struct sm501_devdata *sm) 211 { 212 dev_info(sm->dev, "CurrentGate %08x\n", 213 smc501_readl(sm->regs + SM501_CURRENT_GATE)); 214 dev_info(sm->dev, "CurrentClock %08x\n", 215 smc501_readl(sm->regs + SM501_CURRENT_CLOCK)); 216 dev_info(sm->dev, "PowerModeControl %08x\n", 217 smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL)); 218 } 219 220 #else 221 static inline void sm501_dump_gate(struct sm501_devdata *sm) { } 222 static inline void sm501_dump_regs(struct sm501_devdata *sm) { } 223 static inline void sm501_dump_clk(struct sm501_devdata *sm) { } 224 #endif 225 226 /* sm501_sync_regs 227 * 228 * ensure the 229 */ 230 231 static void sm501_sync_regs(struct sm501_devdata *sm) 232 { 233 smc501_readl(sm->regs); 234 } 235 236 static inline void sm501_mdelay(struct sm501_devdata *sm, unsigned int delay) 237 { 238 /* during suspend/resume, we are currently not allowed to sleep, 239 * so change to using mdelay() instead of msleep() if we 240 * are in one of these paths */ 241 242 if (sm->in_suspend) 243 mdelay(delay); 244 else 245 msleep(delay); 246 } 247 248 /* sm501_misc_control 249 * 250 * alters the miscellaneous control parameters 251 */ 252 253 int sm501_misc_control(struct device *dev, 254 unsigned long set, unsigned long clear) 255 { 256 struct sm501_devdata *sm = dev_get_drvdata(dev); 257 unsigned long misc; 258 unsigned long save; 259 unsigned long to; 260 261 spin_lock_irqsave(&sm->reg_lock, save); 262 263 misc = smc501_readl(sm->regs + SM501_MISC_CONTROL); 264 to = (misc & ~clear) | set; 265 266 if (to != misc) { 267 smc501_writel(to, sm->regs + SM501_MISC_CONTROL); 268 sm501_sync_regs(sm); 269 270 dev_dbg(sm->dev, "MISC_CONTROL %08lx\n", misc); 271 } 272 273 spin_unlock_irqrestore(&sm->reg_lock, save); 274 return to; 275 } 276 277 EXPORT_SYMBOL_GPL(sm501_misc_control); 278 279 /* sm501_modify_reg 280 * 281 * Modify a register in the SM501 which may be shared with other 282 * drivers. 283 */ 284 285 unsigned long sm501_modify_reg(struct device *dev, 286 unsigned long reg, 287 unsigned long set, 288 unsigned long clear) 289 { 290 struct sm501_devdata *sm = dev_get_drvdata(dev); 291 unsigned long data; 292 unsigned long save; 293 294 spin_lock_irqsave(&sm->reg_lock, save); 295 296 data = smc501_readl(sm->regs + reg); 297 data |= set; 298 data &= ~clear; 299 300 smc501_writel(data, sm->regs + reg); 301 sm501_sync_regs(sm); 302 303 spin_unlock_irqrestore(&sm->reg_lock, save); 304 305 return data; 306 } 307 308 EXPORT_SYMBOL_GPL(sm501_modify_reg); 309 310 /* sm501_unit_power 311 * 312 * alters the power active gate to set specific units on or off 313 */ 314 315 int sm501_unit_power(struct device *dev, unsigned int unit, unsigned int to) 316 { 317 struct sm501_devdata *sm = dev_get_drvdata(dev); 318 unsigned long mode; 319 unsigned long gate; 320 unsigned long clock; 321 322 mutex_lock(&sm->clock_lock); 323 324 mode = smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL); 325 gate = smc501_readl(sm->regs + SM501_CURRENT_GATE); 326 clock = smc501_readl(sm->regs + SM501_CURRENT_CLOCK); 327 328 mode &= 3; /* get current power mode */ 329 330 if (unit >= ARRAY_SIZE(sm->unit_power)) { 331 dev_err(dev, "%s: bad unit %d\n", __func__, unit); 332 goto already; 333 } 334 335 dev_dbg(sm->dev, "%s: unit %d, cur %d, to %d\n", __func__, unit, 336 sm->unit_power[unit], to); 337 338 if (to == 0 && sm->unit_power[unit] == 0) { 339 dev_err(sm->dev, "unit %d is already shutdown\n", unit); 340 goto already; 341 } 342 343 sm->unit_power[unit] += to ? 1 : -1; 344 to = sm->unit_power[unit] ? 1 : 0; 345 346 if (to) { 347 if (gate & (1 << unit)) 348 goto already; 349 gate |= (1 << unit); 350 } else { 351 if (!(gate & (1 << unit))) 352 goto already; 353 gate &= ~(1 << unit); 354 } 355 356 switch (mode) { 357 case 1: 358 smc501_writel(gate, sm->regs + SM501_POWER_MODE_0_GATE); 359 smc501_writel(clock, sm->regs + SM501_POWER_MODE_0_CLOCK); 360 mode = 0; 361 break; 362 case 2: 363 case 0: 364 smc501_writel(gate, sm->regs + SM501_POWER_MODE_1_GATE); 365 smc501_writel(clock, sm->regs + SM501_POWER_MODE_1_CLOCK); 366 mode = 1; 367 break; 368 369 default: 370 gate = -1; 371 goto already; 372 } 373 374 smc501_writel(mode, sm->regs + SM501_POWER_MODE_CONTROL); 375 sm501_sync_regs(sm); 376 377 dev_dbg(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n", 378 gate, clock, mode); 379 380 sm501_mdelay(sm, 16); 381 382 already: 383 mutex_unlock(&sm->clock_lock); 384 return gate; 385 } 386 387 EXPORT_SYMBOL_GPL(sm501_unit_power); 388 389 /* clock value structure. */ 390 struct sm501_clock { 391 unsigned long mclk; 392 int divider; 393 int shift; 394 unsigned int m, n, k; 395 }; 396 397 /* sm501_calc_clock 398 * 399 * Calculates the nearest discrete clock frequency that 400 * can be achieved with the specified input clock. 401 * the maximum divisor is 3 or 5 402 */ 403 404 static int sm501_calc_clock(unsigned long freq, 405 struct sm501_clock *clock, 406 int max_div, 407 unsigned long mclk, 408 long *best_diff) 409 { 410 int ret = 0; 411 int divider; 412 int shift; 413 long diff; 414 415 /* try dividers 1 and 3 for CRT and for panel, 416 try divider 5 for panel only.*/ 417 418 for (divider = 1; divider <= max_div; divider += 2) { 419 /* try all 8 shift values.*/ 420 for (shift = 0; shift < 8; shift++) { 421 /* Calculate difference to requested clock */ 422 diff = DIV_ROUND_CLOSEST(mclk, divider << shift) - freq; 423 if (diff < 0) 424 diff = -diff; 425 426 /* If it is less than the current, use it */ 427 if (diff < *best_diff) { 428 *best_diff = diff; 429 430 clock->mclk = mclk; 431 clock->divider = divider; 432 clock->shift = shift; 433 ret = 1; 434 } 435 } 436 } 437 438 return ret; 439 } 440 441 /* sm501_calc_pll 442 * 443 * Calculates the nearest discrete clock frequency that can be 444 * achieved using the programmable PLL. 445 * the maximum divisor is 3 or 5 446 */ 447 448 static unsigned long sm501_calc_pll(unsigned long freq, 449 struct sm501_clock *clock, 450 int max_div) 451 { 452 unsigned long mclk; 453 unsigned int m, n, k; 454 long best_diff = 999999999; 455 456 /* 457 * The SM502 datasheet doesn't specify the min/max values for M and N. 458 * N = 1 at least doesn't work in practice. 459 */ 460 for (m = 2; m <= 255; m++) { 461 for (n = 2; n <= 127; n++) { 462 for (k = 0; k <= 1; k++) { 463 mclk = (24000000UL * m / n) >> k; 464 465 if (sm501_calc_clock(freq, clock, max_div, 466 mclk, &best_diff)) { 467 clock->m = m; 468 clock->n = n; 469 clock->k = k; 470 } 471 } 472 } 473 } 474 475 /* Return best clock. */ 476 return clock->mclk / (clock->divider << clock->shift); 477 } 478 479 /* sm501_select_clock 480 * 481 * Calculates the nearest discrete clock frequency that can be 482 * achieved using the 288MHz and 336MHz PLLs. 483 * the maximum divisor is 3 or 5 484 */ 485 486 static unsigned long sm501_select_clock(unsigned long freq, 487 struct sm501_clock *clock, 488 int max_div) 489 { 490 unsigned long mclk; 491 long best_diff = 999999999; 492 493 /* Try 288MHz and 336MHz clocks. */ 494 for (mclk = 288000000; mclk <= 336000000; mclk += 48000000) { 495 sm501_calc_clock(freq, clock, max_div, mclk, &best_diff); 496 } 497 498 /* Return best clock. */ 499 return clock->mclk / (clock->divider << clock->shift); 500 } 501 502 /* sm501_set_clock 503 * 504 * set one of the four clock sources to the closest available frequency to 505 * the one specified 506 */ 507 508 unsigned long sm501_set_clock(struct device *dev, 509 int clksrc, 510 unsigned long req_freq) 511 { 512 struct sm501_devdata *sm = dev_get_drvdata(dev); 513 unsigned long mode = smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL); 514 unsigned long gate = smc501_readl(sm->regs + SM501_CURRENT_GATE); 515 unsigned long clock = smc501_readl(sm->regs + SM501_CURRENT_CLOCK); 516 unsigned int pll_reg = 0; 517 unsigned long sm501_freq; /* the actual frequency achieved */ 518 u64 reg; 519 520 struct sm501_clock to; 521 522 /* find achivable discrete frequency and setup register value 523 * accordingly, V2XCLK, MCLK and M1XCLK are the same P2XCLK 524 * has an extra bit for the divider */ 525 526 switch (clksrc) { 527 case SM501_CLOCK_P2XCLK: 528 /* This clock is divided in half so to achieve the 529 * requested frequency the value must be multiplied by 530 * 2. This clock also has an additional pre divisor */ 531 532 if (sm->rev >= 0xC0) { 533 /* SM502 -> use the programmable PLL */ 534 sm501_freq = (sm501_calc_pll(2 * req_freq, 535 &to, 5) / 2); 536 reg = to.shift & 0x07;/* bottom 3 bits are shift */ 537 if (to.divider == 3) 538 reg |= 0x08; /* /3 divider required */ 539 else if (to.divider == 5) 540 reg |= 0x10; /* /5 divider required */ 541 reg |= 0x40; /* select the programmable PLL */ 542 pll_reg = 0x20000 | (to.k << 15) | (to.n << 8) | to.m; 543 } else { 544 sm501_freq = (sm501_select_clock(2 * req_freq, 545 &to, 5) / 2); 546 reg = to.shift & 0x07;/* bottom 3 bits are shift */ 547 if (to.divider == 3) 548 reg |= 0x08; /* /3 divider required */ 549 else if (to.divider == 5) 550 reg |= 0x10; /* /5 divider required */ 551 if (to.mclk != 288000000) 552 reg |= 0x20; /* which mclk pll is source */ 553 } 554 break; 555 556 case SM501_CLOCK_V2XCLK: 557 /* This clock is divided in half so to achieve the 558 * requested frequency the value must be multiplied by 2. */ 559 560 sm501_freq = (sm501_select_clock(2 * req_freq, &to, 3) / 2); 561 reg=to.shift & 0x07; /* bottom 3 bits are shift */ 562 if (to.divider == 3) 563 reg |= 0x08; /* /3 divider required */ 564 if (to.mclk != 288000000) 565 reg |= 0x10; /* which mclk pll is source */ 566 break; 567 568 case SM501_CLOCK_MCLK: 569 case SM501_CLOCK_M1XCLK: 570 /* These clocks are the same and not further divided */ 571 572 sm501_freq = sm501_select_clock( req_freq, &to, 3); 573 reg=to.shift & 0x07; /* bottom 3 bits are shift */ 574 if (to.divider == 3) 575 reg |= 0x08; /* /3 divider required */ 576 if (to.mclk != 288000000) 577 reg |= 0x10; /* which mclk pll is source */ 578 break; 579 580 default: 581 return 0; /* this is bad */ 582 } 583 584 mutex_lock(&sm->clock_lock); 585 586 mode = smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL); 587 gate = smc501_readl(sm->regs + SM501_CURRENT_GATE); 588 clock = smc501_readl(sm->regs + SM501_CURRENT_CLOCK); 589 590 clock = clock & ~(0xFF << clksrc); 591 clock |= reg<<clksrc; 592 593 mode &= 3; /* find current mode */ 594 595 switch (mode) { 596 case 1: 597 smc501_writel(gate, sm->regs + SM501_POWER_MODE_0_GATE); 598 smc501_writel(clock, sm->regs + SM501_POWER_MODE_0_CLOCK); 599 mode = 0; 600 break; 601 case 2: 602 case 0: 603 smc501_writel(gate, sm->regs + SM501_POWER_MODE_1_GATE); 604 smc501_writel(clock, sm->regs + SM501_POWER_MODE_1_CLOCK); 605 mode = 1; 606 break; 607 608 default: 609 mutex_unlock(&sm->clock_lock); 610 return -1; 611 } 612 613 smc501_writel(mode, sm->regs + SM501_POWER_MODE_CONTROL); 614 615 if (pll_reg) 616 smc501_writel(pll_reg, 617 sm->regs + SM501_PROGRAMMABLE_PLL_CONTROL); 618 619 sm501_sync_regs(sm); 620 621 dev_dbg(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n", 622 gate, clock, mode); 623 624 sm501_mdelay(sm, 16); 625 mutex_unlock(&sm->clock_lock); 626 627 sm501_dump_clk(sm); 628 629 return sm501_freq; 630 } 631 632 EXPORT_SYMBOL_GPL(sm501_set_clock); 633 634 /* sm501_find_clock 635 * 636 * finds the closest available frequency for a given clock 637 */ 638 639 unsigned long sm501_find_clock(struct device *dev, 640 int clksrc, 641 unsigned long req_freq) 642 { 643 struct sm501_devdata *sm = dev_get_drvdata(dev); 644 unsigned long sm501_freq; /* the frequency achieveable by the 501 */ 645 struct sm501_clock to; 646 647 switch (clksrc) { 648 case SM501_CLOCK_P2XCLK: 649 if (sm->rev >= 0xC0) { 650 /* SM502 -> use the programmable PLL */ 651 sm501_freq = (sm501_calc_pll(2 * req_freq, 652 &to, 5) / 2); 653 } else { 654 sm501_freq = (sm501_select_clock(2 * req_freq, 655 &to, 5) / 2); 656 } 657 break; 658 659 case SM501_CLOCK_V2XCLK: 660 sm501_freq = (sm501_select_clock(2 * req_freq, &to, 3) / 2); 661 break; 662 663 case SM501_CLOCK_MCLK: 664 case SM501_CLOCK_M1XCLK: 665 sm501_freq = sm501_select_clock(req_freq, &to, 3); 666 break; 667 668 default: 669 sm501_freq = 0; /* error */ 670 } 671 672 return sm501_freq; 673 } 674 675 EXPORT_SYMBOL_GPL(sm501_find_clock); 676 677 static struct sm501_device *to_sm_device(struct platform_device *pdev) 678 { 679 return container_of(pdev, struct sm501_device, pdev); 680 } 681 682 /* sm501_device_release 683 * 684 * A release function for the platform devices we create to allow us to 685 * free any items we allocated 686 */ 687 688 static void sm501_device_release(struct device *dev) 689 { 690 kfree(to_sm_device(to_platform_device(dev))); 691 } 692 693 /* sm501_create_subdev 694 * 695 * Create a skeleton platform device with resources for passing to a 696 * sub-driver 697 */ 698 699 static struct platform_device * 700 sm501_create_subdev(struct sm501_devdata *sm, char *name, 701 unsigned int res_count, unsigned int platform_data_size) 702 { 703 struct sm501_device *smdev; 704 705 smdev = kzalloc(sizeof(struct sm501_device) + 706 (sizeof(struct resource) * res_count) + 707 platform_data_size, GFP_KERNEL); 708 if (!smdev) 709 return NULL; 710 711 smdev->pdev.dev.release = sm501_device_release; 712 713 smdev->pdev.name = name; 714 smdev->pdev.id = sm->pdev_id; 715 smdev->pdev.dev.parent = sm->dev; 716 smdev->pdev.dev.coherent_dma_mask = 0xffffffff; 717 718 if (res_count) { 719 smdev->pdev.resource = (struct resource *)(smdev+1); 720 smdev->pdev.num_resources = res_count; 721 } 722 if (platform_data_size) 723 smdev->pdev.dev.platform_data = (void *)(smdev+1); 724 725 return &smdev->pdev; 726 } 727 728 /* sm501_register_device 729 * 730 * Register a platform device created with sm501_create_subdev() 731 */ 732 733 static int sm501_register_device(struct sm501_devdata *sm, 734 struct platform_device *pdev) 735 { 736 struct sm501_device *smdev = to_sm_device(pdev); 737 int ptr; 738 int ret; 739 740 for (ptr = 0; ptr < pdev->num_resources; ptr++) { 741 printk(KERN_DEBUG "%s[%d] %pR\n", 742 pdev->name, ptr, &pdev->resource[ptr]); 743 } 744 745 ret = platform_device_register(pdev); 746 747 if (ret >= 0) { 748 dev_dbg(sm->dev, "registered %s\n", pdev->name); 749 list_add_tail(&smdev->list, &sm->devices); 750 } else 751 dev_err(sm->dev, "error registering %s (%d)\n", 752 pdev->name, ret); 753 754 return ret; 755 } 756 757 /* sm501_create_subio 758 * 759 * Fill in an IO resource for a sub device 760 */ 761 762 static void sm501_create_subio(struct sm501_devdata *sm, 763 struct resource *res, 764 resource_size_t offs, 765 resource_size_t size) 766 { 767 res->flags = IORESOURCE_MEM; 768 res->parent = sm->io_res; 769 res->start = sm->io_res->start + offs; 770 res->end = res->start + size - 1; 771 } 772 773 /* sm501_create_mem 774 * 775 * Fill in an MEM resource for a sub device 776 */ 777 778 static void sm501_create_mem(struct sm501_devdata *sm, 779 struct resource *res, 780 resource_size_t *offs, 781 resource_size_t size) 782 { 783 *offs -= size; /* adjust memory size */ 784 785 res->flags = IORESOURCE_MEM; 786 res->parent = sm->mem_res; 787 res->start = sm->mem_res->start + *offs; 788 res->end = res->start + size - 1; 789 } 790 791 /* sm501_create_irq 792 * 793 * Fill in an IRQ resource for a sub device 794 */ 795 796 static void sm501_create_irq(struct sm501_devdata *sm, 797 struct resource *res) 798 { 799 res->flags = IORESOURCE_IRQ; 800 res->parent = NULL; 801 res->start = res->end = sm->irq; 802 } 803 804 static int sm501_register_usbhost(struct sm501_devdata *sm, 805 resource_size_t *mem_avail) 806 { 807 struct platform_device *pdev; 808 809 pdev = sm501_create_subdev(sm, "sm501-usb", 3, 0); 810 if (!pdev) 811 return -ENOMEM; 812 813 sm501_create_subio(sm, &pdev->resource[0], 0x40000, 0x20000); 814 sm501_create_mem(sm, &pdev->resource[1], mem_avail, 256*1024); 815 sm501_create_irq(sm, &pdev->resource[2]); 816 817 return sm501_register_device(sm, pdev); 818 } 819 820 static void sm501_setup_uart_data(struct sm501_devdata *sm, 821 struct plat_serial8250_port *uart_data, 822 unsigned int offset) 823 { 824 uart_data->membase = sm->regs + offset; 825 uart_data->mapbase = sm->io_res->start + offset; 826 uart_data->iotype = UPIO_MEM; 827 uart_data->irq = sm->irq; 828 uart_data->flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ; 829 uart_data->regshift = 2; 830 uart_data->uartclk = (9600 * 16); 831 } 832 833 static int sm501_register_uart(struct sm501_devdata *sm, int devices) 834 { 835 struct platform_device *pdev; 836 struct plat_serial8250_port *uart_data; 837 838 pdev = sm501_create_subdev(sm, "serial8250", 0, 839 sizeof(struct plat_serial8250_port) * 3); 840 if (!pdev) 841 return -ENOMEM; 842 843 uart_data = dev_get_platdata(&pdev->dev); 844 845 if (devices & SM501_USE_UART0) { 846 sm501_setup_uart_data(sm, uart_data++, 0x30000); 847 sm501_unit_power(sm->dev, SM501_GATE_UART0, 1); 848 sm501_modify_reg(sm->dev, SM501_IRQ_MASK, 1 << 12, 0); 849 sm501_modify_reg(sm->dev, SM501_GPIO63_32_CONTROL, 0x01e0, 0); 850 } 851 if (devices & SM501_USE_UART1) { 852 sm501_setup_uart_data(sm, uart_data++, 0x30020); 853 sm501_unit_power(sm->dev, SM501_GATE_UART1, 1); 854 sm501_modify_reg(sm->dev, SM501_IRQ_MASK, 1 << 13, 0); 855 sm501_modify_reg(sm->dev, SM501_GPIO63_32_CONTROL, 0x1e00, 0); 856 } 857 858 pdev->id = PLAT8250_DEV_SM501; 859 860 return sm501_register_device(sm, pdev); 861 } 862 863 static int sm501_register_display(struct sm501_devdata *sm, 864 resource_size_t *mem_avail) 865 { 866 struct platform_device *pdev; 867 868 pdev = sm501_create_subdev(sm, "sm501-fb", 4, 0); 869 if (!pdev) 870 return -ENOMEM; 871 872 sm501_create_subio(sm, &pdev->resource[0], 0x80000, 0x10000); 873 sm501_create_subio(sm, &pdev->resource[1], 0x100000, 0x50000); 874 sm501_create_mem(sm, &pdev->resource[2], mem_avail, *mem_avail); 875 sm501_create_irq(sm, &pdev->resource[3]); 876 877 return sm501_register_device(sm, pdev); 878 } 879 880 #ifdef CONFIG_MFD_SM501_GPIO 881 882 static inline struct sm501_devdata *sm501_gpio_to_dev(struct sm501_gpio *gpio) 883 { 884 return container_of(gpio, struct sm501_devdata, gpio); 885 } 886 887 static int sm501_gpio_get(struct gpio_chip *chip, unsigned offset) 888 889 { 890 struct sm501_gpio_chip *smgpio = gpiochip_get_data(chip); 891 unsigned long result; 892 893 result = smc501_readl(smgpio->regbase + SM501_GPIO_DATA_LOW); 894 result >>= offset; 895 896 return result & 1UL; 897 } 898 899 static void sm501_gpio_ensure_gpio(struct sm501_gpio_chip *smchip, 900 unsigned long bit) 901 { 902 unsigned long ctrl; 903 904 /* check and modify if this pin is not set as gpio. */ 905 906 if (smc501_readl(smchip->control) & bit) { 907 dev_info(sm501_gpio_to_dev(smchip->ourgpio)->dev, 908 "changing mode of gpio, bit %08lx\n", bit); 909 910 ctrl = smc501_readl(smchip->control); 911 ctrl &= ~bit; 912 smc501_writel(ctrl, smchip->control); 913 914 sm501_sync_regs(sm501_gpio_to_dev(smchip->ourgpio)); 915 } 916 } 917 918 static void sm501_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 919 920 { 921 struct sm501_gpio_chip *smchip = gpiochip_get_data(chip); 922 struct sm501_gpio *smgpio = smchip->ourgpio; 923 unsigned long bit = 1 << offset; 924 void __iomem *regs = smchip->regbase; 925 unsigned long save; 926 unsigned long val; 927 928 dev_dbg(sm501_gpio_to_dev(smgpio)->dev, "%s(%p,%d)\n", 929 __func__, chip, offset); 930 931 spin_lock_irqsave(&smgpio->lock, save); 932 933 val = smc501_readl(regs + SM501_GPIO_DATA_LOW) & ~bit; 934 if (value) 935 val |= bit; 936 smc501_writel(val, regs); 937 938 sm501_sync_regs(sm501_gpio_to_dev(smgpio)); 939 sm501_gpio_ensure_gpio(smchip, bit); 940 941 spin_unlock_irqrestore(&smgpio->lock, save); 942 } 943 944 static int sm501_gpio_input(struct gpio_chip *chip, unsigned offset) 945 { 946 struct sm501_gpio_chip *smchip = gpiochip_get_data(chip); 947 struct sm501_gpio *smgpio = smchip->ourgpio; 948 void __iomem *regs = smchip->regbase; 949 unsigned long bit = 1 << offset; 950 unsigned long save; 951 unsigned long ddr; 952 953 dev_dbg(sm501_gpio_to_dev(smgpio)->dev, "%s(%p,%d)\n", 954 __func__, chip, offset); 955 956 spin_lock_irqsave(&smgpio->lock, save); 957 958 ddr = smc501_readl(regs + SM501_GPIO_DDR_LOW); 959 smc501_writel(ddr & ~bit, regs + SM501_GPIO_DDR_LOW); 960 961 sm501_sync_regs(sm501_gpio_to_dev(smgpio)); 962 sm501_gpio_ensure_gpio(smchip, bit); 963 964 spin_unlock_irqrestore(&smgpio->lock, save); 965 966 return 0; 967 } 968 969 static int sm501_gpio_output(struct gpio_chip *chip, 970 unsigned offset, int value) 971 { 972 struct sm501_gpio_chip *smchip = gpiochip_get_data(chip); 973 struct sm501_gpio *smgpio = smchip->ourgpio; 974 unsigned long bit = 1 << offset; 975 void __iomem *regs = smchip->regbase; 976 unsigned long save; 977 unsigned long val; 978 unsigned long ddr; 979 980 dev_dbg(sm501_gpio_to_dev(smgpio)->dev, "%s(%p,%d,%d)\n", 981 __func__, chip, offset, value); 982 983 spin_lock_irqsave(&smgpio->lock, save); 984 985 val = smc501_readl(regs + SM501_GPIO_DATA_LOW); 986 if (value) 987 val |= bit; 988 else 989 val &= ~bit; 990 smc501_writel(val, regs); 991 992 ddr = smc501_readl(regs + SM501_GPIO_DDR_LOW); 993 smc501_writel(ddr | bit, regs + SM501_GPIO_DDR_LOW); 994 995 sm501_sync_regs(sm501_gpio_to_dev(smgpio)); 996 smc501_writel(val, regs + SM501_GPIO_DATA_LOW); 997 998 sm501_sync_regs(sm501_gpio_to_dev(smgpio)); 999 spin_unlock_irqrestore(&smgpio->lock, save); 1000 1001 return 0; 1002 } 1003 1004 static const struct gpio_chip gpio_chip_template = { 1005 .ngpio = 32, 1006 .direction_input = sm501_gpio_input, 1007 .direction_output = sm501_gpio_output, 1008 .set = sm501_gpio_set, 1009 .get = sm501_gpio_get, 1010 }; 1011 1012 static int sm501_gpio_register_chip(struct sm501_devdata *sm, 1013 struct sm501_gpio *gpio, 1014 struct sm501_gpio_chip *chip) 1015 { 1016 struct sm501_platdata *pdata = sm->platdata; 1017 struct gpio_chip *gchip = &chip->gpio; 1018 int base = pdata->gpio_base; 1019 1020 chip->gpio = gpio_chip_template; 1021 1022 if (chip == &gpio->high) { 1023 if (base > 0) 1024 base += 32; 1025 chip->regbase = gpio->regs + SM501_GPIO_DATA_HIGH; 1026 chip->control = sm->regs + SM501_GPIO63_32_CONTROL; 1027 gchip->label = "SM501-HIGH"; 1028 } else { 1029 chip->regbase = gpio->regs + SM501_GPIO_DATA_LOW; 1030 chip->control = sm->regs + SM501_GPIO31_0_CONTROL; 1031 gchip->label = "SM501-LOW"; 1032 } 1033 1034 gchip->base = base; 1035 chip->ourgpio = gpio; 1036 1037 return gpiochip_add_data(gchip, chip); 1038 } 1039 1040 static int sm501_register_gpio(struct sm501_devdata *sm) 1041 { 1042 struct sm501_gpio *gpio = &sm->gpio; 1043 resource_size_t iobase = sm->io_res->start + SM501_GPIO; 1044 int ret; 1045 1046 dev_dbg(sm->dev, "registering gpio block %08llx\n", 1047 (unsigned long long)iobase); 1048 1049 spin_lock_init(&gpio->lock); 1050 1051 gpio->regs_res = request_mem_region(iobase, 0x20, "sm501-gpio"); 1052 if (!gpio->regs_res) { 1053 dev_err(sm->dev, "gpio: failed to request region\n"); 1054 return -ENXIO; 1055 } 1056 1057 gpio->regs = ioremap(iobase, 0x20); 1058 if (!gpio->regs) { 1059 dev_err(sm->dev, "gpio: failed to remap registers\n"); 1060 ret = -ENXIO; 1061 goto err_claimed; 1062 } 1063 1064 /* Register both our chips. */ 1065 1066 ret = sm501_gpio_register_chip(sm, gpio, &gpio->low); 1067 if (ret) { 1068 dev_err(sm->dev, "failed to add low chip\n"); 1069 goto err_mapped; 1070 } 1071 1072 ret = sm501_gpio_register_chip(sm, gpio, &gpio->high); 1073 if (ret) { 1074 dev_err(sm->dev, "failed to add high chip\n"); 1075 goto err_low_chip; 1076 } 1077 1078 gpio->registered = 1; 1079 1080 return 0; 1081 1082 err_low_chip: 1083 gpiochip_remove(&gpio->low.gpio); 1084 1085 err_mapped: 1086 iounmap(gpio->regs); 1087 1088 err_claimed: 1089 release_mem_region(iobase, 0x20); 1090 1091 return ret; 1092 } 1093 1094 static void sm501_gpio_remove(struct sm501_devdata *sm) 1095 { 1096 struct sm501_gpio *gpio = &sm->gpio; 1097 resource_size_t iobase = sm->io_res->start + SM501_GPIO; 1098 1099 if (!sm->gpio.registered) 1100 return; 1101 1102 gpiochip_remove(&gpio->low.gpio); 1103 gpiochip_remove(&gpio->high.gpio); 1104 1105 iounmap(gpio->regs); 1106 release_mem_region(iobase, 0x20); 1107 } 1108 1109 static inline int sm501_gpio_isregistered(struct sm501_devdata *sm) 1110 { 1111 return sm->gpio.registered; 1112 } 1113 #else 1114 static inline int sm501_register_gpio(struct sm501_devdata *sm) 1115 { 1116 return 0; 1117 } 1118 1119 static inline void sm501_gpio_remove(struct sm501_devdata *sm) 1120 { 1121 } 1122 1123 static inline int sm501_gpio_isregistered(struct sm501_devdata *sm) 1124 { 1125 return 0; 1126 } 1127 #endif 1128 1129 static int sm501_register_gpio_i2c_instance(struct sm501_devdata *sm, 1130 struct sm501_platdata_gpio_i2c *iic) 1131 { 1132 struct i2c_gpio_platform_data *icd; 1133 struct platform_device *pdev; 1134 struct gpiod_lookup_table *lookup; 1135 1136 pdev = sm501_create_subdev(sm, "i2c-gpio", 0, 1137 sizeof(struct i2c_gpio_platform_data)); 1138 if (!pdev) 1139 return -ENOMEM; 1140 1141 /* Create a gpiod lookup using gpiochip-local offsets */ 1142 lookup = devm_kzalloc(&pdev->dev, struct_size(lookup, table, 3), 1143 GFP_KERNEL); 1144 if (!lookup) 1145 return -ENOMEM; 1146 1147 lookup->dev_id = "i2c-gpio"; 1148 lookup->table[0] = (struct gpiod_lookup) 1149 GPIO_LOOKUP_IDX(iic->pin_sda < 32 ? "SM501-LOW" : "SM501-HIGH", 1150 iic->pin_sda % 32, NULL, 0, 1151 GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN); 1152 lookup->table[1] = (struct gpiod_lookup) 1153 GPIO_LOOKUP_IDX(iic->pin_scl < 32 ? "SM501-LOW" : "SM501-HIGH", 1154 iic->pin_scl % 32, NULL, 1, 1155 GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN); 1156 gpiod_add_lookup_table(lookup); 1157 1158 icd = dev_get_platdata(&pdev->dev); 1159 icd->timeout = iic->timeout; 1160 icd->udelay = iic->udelay; 1161 1162 /* note, we can't use either of the pin numbers, as the i2c-gpio 1163 * driver uses the platform.id field to generate the bus number 1164 * to register with the i2c core; The i2c core doesn't have enough 1165 * entries to deal with anything we currently use. 1166 */ 1167 1168 pdev->id = iic->bus_num; 1169 1170 dev_info(sm->dev, "registering i2c-%d: sda=%d, scl=%d\n", 1171 iic->bus_num, 1172 iic->pin_sda, iic->pin_scl); 1173 1174 return sm501_register_device(sm, pdev); 1175 } 1176 1177 static int sm501_register_gpio_i2c(struct sm501_devdata *sm, 1178 struct sm501_platdata *pdata) 1179 { 1180 struct sm501_platdata_gpio_i2c *iic = pdata->gpio_i2c; 1181 int index; 1182 int ret; 1183 1184 for (index = 0; index < pdata->gpio_i2c_nr; index++, iic++) { 1185 ret = sm501_register_gpio_i2c_instance(sm, iic); 1186 if (ret < 0) 1187 return ret; 1188 } 1189 1190 return 0; 1191 } 1192 1193 /* sm501_dbg_regs 1194 * 1195 * Debug attribute to attach to parent device to show core registers 1196 */ 1197 1198 static ssize_t sm501_dbg_regs(struct device *dev, 1199 struct device_attribute *attr, char *buff) 1200 { 1201 struct sm501_devdata *sm = dev_get_drvdata(dev) ; 1202 unsigned int reg; 1203 char *ptr = buff; 1204 int ret; 1205 1206 for (reg = 0x00; reg < 0x70; reg += 4) { 1207 ret = sprintf(ptr, "%08x = %08x\n", 1208 reg, smc501_readl(sm->regs + reg)); 1209 ptr += ret; 1210 } 1211 1212 return ptr - buff; 1213 } 1214 1215 1216 static DEVICE_ATTR(dbg_regs, 0444, sm501_dbg_regs, NULL); 1217 1218 /* sm501_init_reg 1219 * 1220 * Helper function for the init code to setup a register 1221 * 1222 * clear the bits which are set in r->mask, and then set 1223 * the bits set in r->set. 1224 */ 1225 1226 static inline void sm501_init_reg(struct sm501_devdata *sm, 1227 unsigned long reg, 1228 struct sm501_reg_init *r) 1229 { 1230 unsigned long tmp; 1231 1232 tmp = smc501_readl(sm->regs + reg); 1233 tmp &= ~r->mask; 1234 tmp |= r->set; 1235 smc501_writel(tmp, sm->regs + reg); 1236 } 1237 1238 /* sm501_init_regs 1239 * 1240 * Setup core register values 1241 */ 1242 1243 static void sm501_init_regs(struct sm501_devdata *sm, 1244 struct sm501_initdata *init) 1245 { 1246 sm501_misc_control(sm->dev, 1247 init->misc_control.set, 1248 init->misc_control.mask); 1249 1250 sm501_init_reg(sm, SM501_MISC_TIMING, &init->misc_timing); 1251 sm501_init_reg(sm, SM501_GPIO31_0_CONTROL, &init->gpio_low); 1252 sm501_init_reg(sm, SM501_GPIO63_32_CONTROL, &init->gpio_high); 1253 1254 if (init->m1xclk) { 1255 dev_info(sm->dev, "setting M1XCLK to %ld\n", init->m1xclk); 1256 sm501_set_clock(sm->dev, SM501_CLOCK_M1XCLK, init->m1xclk); 1257 } 1258 1259 if (init->mclk) { 1260 dev_info(sm->dev, "setting MCLK to %ld\n", init->mclk); 1261 sm501_set_clock(sm->dev, SM501_CLOCK_MCLK, init->mclk); 1262 } 1263 1264 } 1265 1266 /* Check the PLL sources for the M1CLK and M1XCLK 1267 * 1268 * If the M1CLK and M1XCLKs are not sourced from the same PLL, then 1269 * there is a risk (see errata AB-5) that the SM501 will cease proper 1270 * function. If this happens, then it is likely the SM501 will 1271 * hang the system. 1272 */ 1273 1274 static int sm501_check_clocks(struct sm501_devdata *sm) 1275 { 1276 unsigned long pwrmode = smc501_readl(sm->regs + SM501_CURRENT_CLOCK); 1277 unsigned long msrc = (pwrmode & SM501_POWERMODE_M_SRC); 1278 unsigned long m1src = (pwrmode & SM501_POWERMODE_M1_SRC); 1279 1280 return ((msrc == 0 && m1src != 0) || (msrc != 0 && m1src == 0)); 1281 } 1282 1283 static unsigned int sm501_mem_local[] = { 1284 [0] = 4*1024*1024, 1285 [1] = 8*1024*1024, 1286 [2] = 16*1024*1024, 1287 [3] = 32*1024*1024, 1288 [4] = 64*1024*1024, 1289 [5] = 2*1024*1024, 1290 }; 1291 1292 /* sm501_init_dev 1293 * 1294 * Common init code for an SM501 1295 */ 1296 1297 static int sm501_init_dev(struct sm501_devdata *sm) 1298 { 1299 struct sm501_initdata *idata; 1300 struct sm501_platdata *pdata; 1301 resource_size_t mem_avail; 1302 unsigned long dramctrl; 1303 unsigned long devid; 1304 int ret; 1305 1306 mutex_init(&sm->clock_lock); 1307 spin_lock_init(&sm->reg_lock); 1308 1309 INIT_LIST_HEAD(&sm->devices); 1310 1311 devid = smc501_readl(sm->regs + SM501_DEVICEID); 1312 1313 if ((devid & SM501_DEVICEID_IDMASK) != SM501_DEVICEID_SM501) { 1314 dev_err(sm->dev, "incorrect device id %08lx\n", devid); 1315 return -EINVAL; 1316 } 1317 1318 /* disable irqs */ 1319 smc501_writel(0, sm->regs + SM501_IRQ_MASK); 1320 1321 dramctrl = smc501_readl(sm->regs + SM501_DRAM_CONTROL); 1322 mem_avail = sm501_mem_local[(dramctrl >> 13) & 0x7]; 1323 1324 dev_info(sm->dev, "SM501 At %p: Version %08lx, %ld Mb, IRQ %d\n", 1325 sm->regs, devid, (unsigned long)mem_avail >> 20, sm->irq); 1326 1327 sm->rev = devid & SM501_DEVICEID_REVMASK; 1328 1329 sm501_dump_gate(sm); 1330 1331 ret = device_create_file(sm->dev, &dev_attr_dbg_regs); 1332 if (ret) 1333 dev_err(sm->dev, "failed to create debug regs file\n"); 1334 1335 sm501_dump_clk(sm); 1336 1337 /* check to see if we have some device initialisation */ 1338 1339 pdata = sm->platdata; 1340 idata = pdata ? pdata->init : NULL; 1341 1342 if (idata) { 1343 sm501_init_regs(sm, idata); 1344 1345 if (idata->devices & SM501_USE_USB_HOST) 1346 sm501_register_usbhost(sm, &mem_avail); 1347 if (idata->devices & (SM501_USE_UART0 | SM501_USE_UART1)) 1348 sm501_register_uart(sm, idata->devices); 1349 if (idata->devices & SM501_USE_GPIO) 1350 sm501_register_gpio(sm); 1351 } 1352 1353 if (pdata && pdata->gpio_i2c && pdata->gpio_i2c_nr > 0) { 1354 if (!sm501_gpio_isregistered(sm)) 1355 dev_err(sm->dev, "no gpio available for i2c gpio.\n"); 1356 else 1357 sm501_register_gpio_i2c(sm, pdata); 1358 } 1359 1360 ret = sm501_check_clocks(sm); 1361 if (ret) { 1362 dev_err(sm->dev, "M1X and M clocks sourced from different " 1363 "PLLs\n"); 1364 return -EINVAL; 1365 } 1366 1367 /* always create a framebuffer */ 1368 sm501_register_display(sm, &mem_avail); 1369 1370 return 0; 1371 } 1372 1373 static int sm501_plat_probe(struct platform_device *dev) 1374 { 1375 struct sm501_devdata *sm; 1376 int ret; 1377 1378 sm = kzalloc(sizeof(*sm), GFP_KERNEL); 1379 if (!sm) { 1380 ret = -ENOMEM; 1381 goto err1; 1382 } 1383 1384 sm->dev = &dev->dev; 1385 sm->pdev_id = dev->id; 1386 sm->platdata = dev_get_platdata(&dev->dev); 1387 1388 ret = platform_get_irq(dev, 0); 1389 if (ret < 0) 1390 goto err_res; 1391 sm->irq = ret; 1392 1393 sm->io_res = platform_get_resource(dev, IORESOURCE_MEM, 1); 1394 sm->mem_res = platform_get_resource(dev, IORESOURCE_MEM, 0); 1395 if (!sm->io_res || !sm->mem_res) { 1396 dev_err(&dev->dev, "failed to get IO resource\n"); 1397 ret = -ENOENT; 1398 goto err_res; 1399 } 1400 1401 sm->regs_claim = request_mem_region(sm->io_res->start, 1402 0x100, "sm501"); 1403 if (!sm->regs_claim) { 1404 dev_err(&dev->dev, "cannot claim registers\n"); 1405 ret = -EBUSY; 1406 goto err_res; 1407 } 1408 1409 platform_set_drvdata(dev, sm); 1410 1411 sm->regs = ioremap(sm->io_res->start, resource_size(sm->io_res)); 1412 if (!sm->regs) { 1413 dev_err(&dev->dev, "cannot remap registers\n"); 1414 ret = -EIO; 1415 goto err_claim; 1416 } 1417 1418 return sm501_init_dev(sm); 1419 1420 err_claim: 1421 release_mem_region(sm->io_res->start, 0x100); 1422 err_res: 1423 kfree(sm); 1424 err1: 1425 return ret; 1426 1427 } 1428 1429 #ifdef CONFIG_PM 1430 1431 /* power management support */ 1432 1433 static void sm501_set_power(struct sm501_devdata *sm, int on) 1434 { 1435 struct sm501_platdata *pd = sm->platdata; 1436 1437 if (!pd) 1438 return; 1439 1440 if (pd->get_power) { 1441 if (pd->get_power(sm->dev) == on) { 1442 dev_dbg(sm->dev, "is already %d\n", on); 1443 return; 1444 } 1445 } 1446 1447 if (pd->set_power) { 1448 dev_dbg(sm->dev, "setting power to %d\n", on); 1449 1450 pd->set_power(sm->dev, on); 1451 sm501_mdelay(sm, 10); 1452 } 1453 } 1454 1455 static int sm501_plat_suspend(struct platform_device *pdev, pm_message_t state) 1456 { 1457 struct sm501_devdata *sm = platform_get_drvdata(pdev); 1458 1459 sm->in_suspend = 1; 1460 sm->pm_misc = smc501_readl(sm->regs + SM501_MISC_CONTROL); 1461 1462 sm501_dump_regs(sm); 1463 1464 if (sm->platdata) { 1465 if (sm->platdata->flags & SM501_FLAG_SUSPEND_OFF) 1466 sm501_set_power(sm, 0); 1467 } 1468 1469 return 0; 1470 } 1471 1472 static int sm501_plat_resume(struct platform_device *pdev) 1473 { 1474 struct sm501_devdata *sm = platform_get_drvdata(pdev); 1475 1476 sm501_set_power(sm, 1); 1477 1478 sm501_dump_regs(sm); 1479 sm501_dump_gate(sm); 1480 sm501_dump_clk(sm); 1481 1482 /* check to see if we are in the same state as when suspended */ 1483 1484 if (smc501_readl(sm->regs + SM501_MISC_CONTROL) != sm->pm_misc) { 1485 dev_info(sm->dev, "SM501_MISC_CONTROL changed over sleep\n"); 1486 smc501_writel(sm->pm_misc, sm->regs + SM501_MISC_CONTROL); 1487 1488 /* our suspend causes the controller state to change, 1489 * either by something attempting setup, power loss, 1490 * or an external reset event on power change */ 1491 1492 if (sm->platdata && sm->platdata->init) { 1493 sm501_init_regs(sm, sm->platdata->init); 1494 } 1495 } 1496 1497 /* dump our state from resume */ 1498 1499 sm501_dump_regs(sm); 1500 sm501_dump_clk(sm); 1501 1502 sm->in_suspend = 0; 1503 1504 return 0; 1505 } 1506 #else 1507 #define sm501_plat_suspend NULL 1508 #define sm501_plat_resume NULL 1509 #endif 1510 1511 /* Initialisation data for PCI devices */ 1512 1513 static struct sm501_initdata sm501_pci_initdata = { 1514 .gpio_high = { 1515 .set = 0x3F000000, /* 24bit panel */ 1516 .mask = 0x0, 1517 }, 1518 .misc_timing = { 1519 .set = 0x010100, /* SDRAM timing */ 1520 .mask = 0x1F1F00, 1521 }, 1522 .misc_control = { 1523 .set = SM501_MISC_PNL_24BIT, 1524 .mask = 0, 1525 }, 1526 1527 .devices = SM501_USE_ALL, 1528 1529 /* Errata AB-3 says that 72MHz is the fastest available 1530 * for 33MHZ PCI with proper bus-mastering operation */ 1531 1532 .mclk = 72 * MHZ, 1533 .m1xclk = 144 * MHZ, 1534 }; 1535 1536 static struct sm501_platdata_fbsub sm501_pdata_fbsub = { 1537 .flags = (SM501FB_FLAG_USE_INIT_MODE | 1538 SM501FB_FLAG_USE_HWCURSOR | 1539 SM501FB_FLAG_USE_HWACCEL | 1540 SM501FB_FLAG_DISABLE_AT_EXIT), 1541 }; 1542 1543 static struct sm501_platdata_fb sm501_fb_pdata = { 1544 .fb_route = SM501_FB_OWN, 1545 .fb_crt = &sm501_pdata_fbsub, 1546 .fb_pnl = &sm501_pdata_fbsub, 1547 }; 1548 1549 static struct sm501_platdata sm501_pci_platdata = { 1550 .init = &sm501_pci_initdata, 1551 .fb = &sm501_fb_pdata, 1552 .gpio_base = -1, 1553 }; 1554 1555 static int sm501_pci_probe(struct pci_dev *dev, 1556 const struct pci_device_id *id) 1557 { 1558 struct sm501_devdata *sm; 1559 int err; 1560 1561 sm = kzalloc(sizeof(*sm), GFP_KERNEL); 1562 if (!sm) { 1563 err = -ENOMEM; 1564 goto err1; 1565 } 1566 1567 /* set a default set of platform data */ 1568 dev->dev.platform_data = sm->platdata = &sm501_pci_platdata; 1569 1570 /* set a hopefully unique id for our child platform devices */ 1571 sm->pdev_id = 32 + dev->devfn; 1572 1573 pci_set_drvdata(dev, sm); 1574 1575 err = pci_enable_device(dev); 1576 if (err) { 1577 dev_err(&dev->dev, "cannot enable device\n"); 1578 goto err2; 1579 } 1580 1581 sm->dev = &dev->dev; 1582 sm->irq = dev->irq; 1583 1584 #ifdef __BIG_ENDIAN 1585 /* if the system is big-endian, we most probably have a 1586 * translation in the IO layer making the PCI bus little endian 1587 * so make the framebuffer swapped pixels */ 1588 1589 sm501_fb_pdata.flags |= SM501_FBPD_SWAP_FB_ENDIAN; 1590 #endif 1591 1592 /* check our resources */ 1593 1594 if (!(pci_resource_flags(dev, 0) & IORESOURCE_MEM)) { 1595 dev_err(&dev->dev, "region #0 is not memory?\n"); 1596 err = -EINVAL; 1597 goto err3; 1598 } 1599 1600 if (!(pci_resource_flags(dev, 1) & IORESOURCE_MEM)) { 1601 dev_err(&dev->dev, "region #1 is not memory?\n"); 1602 err = -EINVAL; 1603 goto err3; 1604 } 1605 1606 /* make our resources ready for sharing */ 1607 1608 sm->io_res = &dev->resource[1]; 1609 sm->mem_res = &dev->resource[0]; 1610 1611 sm->regs_claim = request_mem_region(sm->io_res->start, 1612 0x100, "sm501"); 1613 if (!sm->regs_claim) { 1614 dev_err(&dev->dev, "cannot claim registers\n"); 1615 err= -EBUSY; 1616 goto err3; 1617 } 1618 1619 sm->regs = pci_ioremap_bar(dev, 1); 1620 if (!sm->regs) { 1621 dev_err(&dev->dev, "cannot remap registers\n"); 1622 err = -EIO; 1623 goto err4; 1624 } 1625 1626 sm501_init_dev(sm); 1627 return 0; 1628 1629 err4: 1630 release_mem_region(sm->io_res->start, 0x100); 1631 err3: 1632 pci_disable_device(dev); 1633 err2: 1634 kfree(sm); 1635 err1: 1636 return err; 1637 } 1638 1639 static void sm501_remove_sub(struct sm501_devdata *sm, 1640 struct sm501_device *smdev) 1641 { 1642 list_del(&smdev->list); 1643 platform_device_unregister(&smdev->pdev); 1644 } 1645 1646 static void sm501_dev_remove(struct sm501_devdata *sm) 1647 { 1648 struct sm501_device *smdev, *tmp; 1649 1650 list_for_each_entry_safe(smdev, tmp, &sm->devices, list) 1651 sm501_remove_sub(sm, smdev); 1652 1653 device_remove_file(sm->dev, &dev_attr_dbg_regs); 1654 1655 sm501_gpio_remove(sm); 1656 } 1657 1658 static void sm501_pci_remove(struct pci_dev *dev) 1659 { 1660 struct sm501_devdata *sm = pci_get_drvdata(dev); 1661 1662 sm501_dev_remove(sm); 1663 iounmap(sm->regs); 1664 1665 release_mem_region(sm->io_res->start, 0x100); 1666 1667 pci_disable_device(dev); 1668 } 1669 1670 static int sm501_plat_remove(struct platform_device *dev) 1671 { 1672 struct sm501_devdata *sm = platform_get_drvdata(dev); 1673 1674 sm501_dev_remove(sm); 1675 iounmap(sm->regs); 1676 1677 release_mem_region(sm->io_res->start, 0x100); 1678 1679 return 0; 1680 } 1681 1682 static const struct pci_device_id sm501_pci_tbl[] = { 1683 { 0x126f, 0x0501, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 }, 1684 { 0, }, 1685 }; 1686 1687 MODULE_DEVICE_TABLE(pci, sm501_pci_tbl); 1688 1689 static struct pci_driver sm501_pci_driver = { 1690 .name = "sm501", 1691 .id_table = sm501_pci_tbl, 1692 .probe = sm501_pci_probe, 1693 .remove = sm501_pci_remove, 1694 }; 1695 1696 MODULE_ALIAS("platform:sm501"); 1697 1698 static const struct of_device_id of_sm501_match_tbl[] = { 1699 { .compatible = "smi,sm501", }, 1700 { /* end */ } 1701 }; 1702 MODULE_DEVICE_TABLE(of, of_sm501_match_tbl); 1703 1704 static struct platform_driver sm501_plat_driver = { 1705 .driver = { 1706 .name = "sm501", 1707 .of_match_table = of_sm501_match_tbl, 1708 }, 1709 .probe = sm501_plat_probe, 1710 .remove = sm501_plat_remove, 1711 .suspend = sm501_plat_suspend, 1712 .resume = sm501_plat_resume, 1713 }; 1714 1715 static int __init sm501_base_init(void) 1716 { 1717 platform_driver_register(&sm501_plat_driver); 1718 return pci_register_driver(&sm501_pci_driver); 1719 } 1720 1721 static void __exit sm501_base_exit(void) 1722 { 1723 platform_driver_unregister(&sm501_plat_driver); 1724 pci_unregister_driver(&sm501_pci_driver); 1725 } 1726 1727 module_init(sm501_base_init); 1728 module_exit(sm501_base_exit); 1729 1730 MODULE_DESCRIPTION("SM501 Core Driver"); 1731 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>, Vincent Sanders"); 1732 MODULE_LICENSE("GPL v2"); 1733