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   1 /* linux/drivers/mfd/sm501.c
   2  *
   3  * Copyright (C) 2006 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *      Vincent Sanders <vince@simtec.co.uk>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * SM501 MFD driver
  12 */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/delay.h>
  17 #include <linux/init.h>
  18 #include <linux/list.h>
  19 #include <linux/device.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/pci.h>
  22
  23 #include <linux/sm501.h>
  24 #include <linux/sm501-regs.h>
  25
  26 #include <asm/io.h>
  27
  28 struct sm501_device {
  29         struct list_head                list;
  30         struct platform_device          pdev;
  31 };
  32
  33 struct sm501_devdata {
  34         spinlock_t                       reg_lock;
  35         struct mutex                     clock_lock;
  36         struct list_head                 devices;
  37
  38         struct device                   *dev;
  39         struct resource                 *io_res;
  40         struct resource                 *mem_res;
  41         struct resource                 *regs_claim;
  42         struct sm501_platdata           *platdata;
  43
  44         unsigned int                     in_suspend;
  45         unsigned long                    pm_misc;
  46
  47         int                              unit_power[20];
  48         unsigned int                     pdev_id;
  49         unsigned int                     irq;
  50         void __iomem                    *regs;
  51 };
  52
  53 #define MHZ (1000 * 1000)
  54
  55 #ifdef DEBUG
  56 static const unsigned int misc_div[] = {
  57         [0]             = 1,
  58         [1]             = 2,
  59         [2]             = 4,
  60         [3]             = 8,
  61         [4]             = 16,
  62         [5]             = 32,
  63         [6]             = 64,
  64         [7]             = 128,
  65         [8]             = 3,
  66         [9]             = 6,
  67         [10]            = 12,
  68         [11]            = 24,
  69         [12]            = 48,
  70         [13]            = 96,
  71         [14]            = 192,
  72         [15]            = 384,
  73 };
  74
  75 static const unsigned int px_div[] = {
  76         [0]             = 1,
  77         [1]             = 2,
  78         [2]             = 4,
  79         [3]             = 8,
  80         [4]             = 16,
  81         [5]             = 32,
  82         [6]             = 64,
  83         [7]             = 128,
  84         [8]             = 3,
  85         [9]             = 6,
  86         [10]            = 12,
  87         [11]            = 24,
  88         [12]            = 48,
  89         [13]            = 96,
  90         [14]            = 192,
  91         [15]            = 384,
  92         [16]            = 5,
  93         [17]            = 10,
  94         [18]            = 20,
  95         [19]            = 40,
  96         [20]            = 80,
  97         [21]            = 160,
  98         [22]            = 320,
  99         [23]            = 604,
 100 };
 101
 102 static unsigned long decode_div(unsigned long pll2, unsigned long val,
 103                                 unsigned int lshft, unsigned int selbit,
 104                                 unsigned long mask, const unsigned int *dtab)
 105 {
 106         if (val & selbit)
 107                 pll2 = 288 * MHZ;
 108
 109         return pll2 / dtab[(val >> lshft) & mask];
 110 }
 111
 112 #define fmt_freq(x) ((x) / MHZ), ((x) % MHZ), (x)
 113
 114 /* sm501_dump_clk
 115  *
 116  * Print out the current clock configuration for the device
 117 */
 118
 119 static void sm501_dump_clk(struct sm501_devdata *sm)
 120 {
 121         unsigned long misct = readl(sm->regs + SM501_MISC_TIMING);
 122         unsigned long pm0 = readl(sm->regs + SM501_POWER_MODE_0_CLOCK);
 123         unsigned long pm1 = readl(sm->regs + SM501_POWER_MODE_1_CLOCK);
 124         unsigned long pmc = readl(sm->regs + SM501_POWER_MODE_CONTROL);
 125         unsigned long sdclk0, sdclk1;
 126         unsigned long pll2 = 0;
 127
 128         switch (misct & 0x30) {
 129         case 0x00:
 130                 pll2 = 336 * MHZ;
 131                 break;
 132         case 0x10:
 133                 pll2 = 288 * MHZ;
 134                 break;
 135         case 0x20:
 136                 pll2 = 240 * MHZ;
 137                 break;
 138         case 0x30:
 139                 pll2 = 192 * MHZ;
 140                 break;
 141         }
 142
 143         sdclk0 = (misct & (1<<12)) ? pll2 : 288 * MHZ;
 144         sdclk0 /= misc_div[((misct >> 8) & 0xf)];
 145
 146         sdclk1 = (misct & (1<<20)) ? pll2 : 288 * MHZ;
 147         sdclk1 /= misc_div[((misct >> 16) & 0xf)];
 148
 149         dev_dbg(sm->dev, "MISCT=%08lx, PM0=%08lx, PM1=%08lx\n",
 150                 misct, pm0, pm1);
 151
 152         dev_dbg(sm->dev, "PLL2 = %ld.%ld MHz (%ld), SDCLK0=%08lx, SDCLK1=%08lx\n",
 153                 fmt_freq(pll2), sdclk0, sdclk1);
 154
 155         dev_dbg(sm->dev, "SDRAM: PM0=%ld, PM1=%ld\n", sdclk0, sdclk1);
 156
 157         dev_dbg(sm->dev, "PM0[%c]: "
 158                  "P2 %ld.%ld MHz (%ld), V2 %ld.%ld (%ld), "
 159                  "M %ld.%ld (%ld), MX1 %ld.%ld (%ld)\n",
 160                  (pmc & 3 ) == 0 ? '*' : '-',
 161                  fmt_freq(decode_div(pll2, pm0, 24, 1<<29, 31, px_div)),
 162                  fmt_freq(decode_div(pll2, pm0, 16, 1<<20, 15, misc_div)),
 163                  fmt_freq(decode_div(pll2, pm0, 8,  1<<12, 15, misc_div)),
 164                  fmt_freq(decode_div(pll2, pm0, 0,  1<<4,  15, misc_div)));
 165
 166         dev_dbg(sm->dev, "PM1[%c]: "
 167                 "P2 %ld.%ld MHz (%ld), V2 %ld.%ld (%ld), "
 168                 "M %ld.%ld (%ld), MX1 %ld.%ld (%ld)\n",
 169                 (pmc & 3 ) == 1 ? '*' : '-',
 170                 fmt_freq(decode_div(pll2, pm1, 24, 1<<29, 31, px_div)),
 171                 fmt_freq(decode_div(pll2, pm1, 16, 1<<20, 15, misc_div)),
 172                 fmt_freq(decode_div(pll2, pm1, 8,  1<<12, 15, misc_div)),
 173                 fmt_freq(decode_div(pll2, pm1, 0,  1<<4,  15, misc_div)));
 174 }
 175
 176 static void sm501_dump_regs(struct sm501_devdata *sm)
 177 {
 178         void __iomem *regs = sm->regs;
 179
 180         dev_info(sm->dev, "System Control   %08x\n",
 181                         readl(regs + SM501_SYSTEM_CONTROL));
 182         dev_info(sm->dev, "Misc Control     %08x\n",
 183                         readl(regs + SM501_MISC_CONTROL));
 184         dev_info(sm->dev, "GPIO Control Low %08x\n",
 185                         readl(regs + SM501_GPIO31_0_CONTROL));
 186         dev_info(sm->dev, "GPIO Control Hi  %08x\n",
 187                         readl(regs + SM501_GPIO63_32_CONTROL));
 188         dev_info(sm->dev, "DRAM Control     %08x\n",
 189                         readl(regs + SM501_DRAM_CONTROL));
 190         dev_info(sm->dev, "Arbitration Ctrl %08x\n",
 191                         readl(regs + SM501_ARBTRTN_CONTROL));
 192         dev_info(sm->dev, "Misc Timing      %08x\n",
 193                         readl(regs + SM501_MISC_TIMING));
 194 }
 195
 196 static void sm501_dump_gate(struct sm501_devdata *sm)
 197 {
 198         dev_info(sm->dev, "CurrentGate      %08x\n",
 199                         readl(sm->regs + SM501_CURRENT_GATE));
 200         dev_info(sm->dev, "CurrentClock     %08x\n",
 201                         readl(sm->regs + SM501_CURRENT_CLOCK));
 202         dev_info(sm->dev, "PowerModeControl %08x\n",
 203                         readl(sm->regs + SM501_POWER_MODE_CONTROL));
 204 }
 205
 206 #else
 207 static inline void sm501_dump_gate(struct sm501_devdata *sm) { }
 208 static inline void sm501_dump_regs(struct sm501_devdata *sm) { }
 209 static inline void sm501_dump_clk(struct sm501_devdata *sm) { }
 210 #endif
 211
 212 /* sm501_sync_regs
 213  *
 214  * ensure the
 215 */
 216
 217 static void sm501_sync_regs(struct sm501_devdata *sm)
 218 {
 219         readl(sm->regs);
 220 }
 221
 222 static inline void sm501_mdelay(struct sm501_devdata *sm, unsigned int delay)
 223 {
 224         /* during suspend/resume, we are currently not allowed to sleep,
 225          * so change to using mdelay() instead of msleep() if we
 226          * are in one of these paths */
 227
 228         if (sm->in_suspend)
 229                 mdelay(delay);
 230         else
 231                 msleep(delay);
 232 }
 233
 234 /* sm501_misc_control
 235  *
 236  * alters the miscellaneous control parameters
 237 */
 238
 239 int sm501_misc_control(struct device *dev,
 240                        unsigned long set, unsigned long clear)
 241 {
 242         struct sm501_devdata *sm = dev_get_drvdata(dev);
 243         unsigned long misc;
 244         unsigned long save;
 245         unsigned long to;
 246
 247         spin_lock_irqsave(&sm->reg_lock, save);
 248
 249         misc = readl(sm->regs + SM501_MISC_CONTROL);
 250         to = (misc & ~clear) | set;
 251
 252         if (to != misc) {
 253                 writel(to, sm->regs + SM501_MISC_CONTROL);
 254                 sm501_sync_regs(sm);
 255
 256                 dev_dbg(sm->dev, "MISC_CONTROL %08lx\n", misc);
 257         }
 258
 259         spin_unlock_irqrestore(&sm->reg_lock, save);
 260         return to;
 261 }
 262
 263 EXPORT_SYMBOL_GPL(sm501_misc_control);
 264
 265 /* sm501_modify_reg
 266  *
 267  * Modify a register in the SM501 which may be shared with other
 268  * drivers.
 269 */
 270
 271 unsigned long sm501_modify_reg(struct device *dev,
 272                                unsigned long reg,
 273                                unsigned long set,
 274                                unsigned long clear)
 275 {
 276         struct sm501_devdata *sm = dev_get_drvdata(dev);
 277         unsigned long data;
 278         unsigned long save;
 279
 280         spin_lock_irqsave(&sm->reg_lock, save);
 281
 282         data = readl(sm->regs + reg);
 283         data |= set;
 284         data &= ~clear;
 285
 286         writel(data, sm->regs + reg);
 287         sm501_sync_regs(sm);
 288
 289         spin_unlock_irqrestore(&sm->reg_lock, save);
 290
 291         return data;
 292 }
 293
 294 EXPORT_SYMBOL_GPL(sm501_modify_reg);
 295
 296 unsigned long sm501_gpio_get(struct device *dev,
 297                              unsigned long gpio)
 298 {
 299         struct sm501_devdata *sm = dev_get_drvdata(dev);
 300         unsigned long result;
 301         unsigned long reg;
 302
 303         reg = (gpio > 32) ? SM501_GPIO_DATA_HIGH : SM501_GPIO_DATA_LOW;
 304         result = readl(sm->regs + reg);
 305
 306         result >>= (gpio & 31);
 307         return result & 1UL;
 308 }
 309
 310 EXPORT_SYMBOL_GPL(sm501_gpio_get);
 311
 312 void sm501_gpio_set(struct device *dev,
 313                     unsigned long gpio,
 314                     unsigned int to,
 315                     unsigned int dir)
 316 {
 317         struct sm501_devdata *sm = dev_get_drvdata(dev);
 318
 319         unsigned long bit = 1 << (gpio & 31);
 320         unsigned long base;
 321         unsigned long save;
 322         unsigned long val;
 323
 324         base = (gpio > 32) ? SM501_GPIO_DATA_HIGH : SM501_GPIO_DATA_LOW;
 325         base += SM501_GPIO;
 326
 327         spin_lock_irqsave(&sm->reg_lock, save);
 328
 329         val = readl(sm->regs + base) & ~bit;
 330         if (to)
 331                 val |= bit;
 332         writel(val, sm->regs + base);
 333
 334         val = readl(sm->regs + SM501_GPIO_DDR_LOW) & ~bit;
 335         if (dir)
 336                 val |= bit;
 337
 338         writel(val, sm->regs + SM501_GPIO_DDR_LOW);
 339         sm501_sync_regs(sm);
 340
 341         spin_unlock_irqrestore(&sm->reg_lock, save);
 342
 343 }
 344
 345 EXPORT_SYMBOL_GPL(sm501_gpio_set);
 346
 347
 348 /* sm501_unit_power
 349  *
 350  * alters the power active gate to set specific units on or off
 351  */
 352
 353 int sm501_unit_power(struct device *dev, unsigned int unit, unsigned int to)
 354 {
 355         struct sm501_devdata *sm = dev_get_drvdata(dev);
 356         unsigned long mode;
 357         unsigned long gate;
 358         unsigned long clock;
 359
 360         mutex_lock(&sm->clock_lock);
 361
 362         mode = readl(sm->regs + SM501_POWER_MODE_CONTROL);
 363         gate = readl(sm->regs + SM501_CURRENT_GATE);
 364         clock = readl(sm->regs + SM501_CURRENT_CLOCK);
 365
 366         mode &= 3;              /* get current power mode */
 367
 368         if (unit >= ARRAY_SIZE(sm->unit_power)) {
 369                 dev_err(dev, "%s: bad unit %d\n", __FUNCTION__, unit);
 370                 goto already;
 371         }
 372
 373         dev_dbg(sm->dev, "%s: unit %d, cur %d, to %d\n", __FUNCTION__, unit,
 374                 sm->unit_power[unit], to);
 375
 376         if (to == 0 && sm->unit_power[unit] == 0) {
 377                 dev_err(sm->dev, "unit %d is already shutdown\n", unit);
 378                 goto already;
 379         }
 380
 381         sm->unit_power[unit] += to ? 1 : -1;
 382         to = sm->unit_power[unit] ? 1 : 0;
 383
 384         if (to) {
 385                 if (gate & (1 << unit))
 386                         goto already;
 387                 gate |= (1 << unit);
 388         } else {
 389                 if (!(gate & (1 << unit)))
 390                         goto already;
 391                 gate &= ~(1 << unit);
 392         }
 393
 394         switch (mode) {
 395         case 1:
 396                 writel(gate, sm->regs + SM501_POWER_MODE_0_GATE);
 397                 writel(clock, sm->regs + SM501_POWER_MODE_0_CLOCK);
 398                 mode = 0;
 399                 break;
 400         case 2:
 401         case 0:
 402                 writel(gate, sm->regs + SM501_POWER_MODE_1_GATE);
 403                 writel(clock, sm->regs + SM501_POWER_MODE_1_CLOCK);
 404                 mode = 1;
 405                 break;
 406
 407         default:
 408                 return -1;
 409         }
 410
 411         writel(mode, sm->regs + SM501_POWER_MODE_CONTROL);
 412         sm501_sync_regs(sm);
 413
 414         dev_dbg(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n",
 415                 gate, clock, mode);
 416
 417         sm501_mdelay(sm, 16);
 418
 419  already:
 420         mutex_unlock(&sm->clock_lock);
 421         return gate;
 422 }
 423
 424 EXPORT_SYMBOL_GPL(sm501_unit_power);
 425
 426
 427 /* Perform a rounded division. */
 428 static long sm501fb_round_div(long num, long denom)
 429 {
 430         /* n / d + 1 / 2 = (2n + d) / 2d */
 431         return (2 * num + denom) / (2 * denom);
 432 }
 433
 434 /* clock value structure. */
 435 struct sm501_clock {
 436         unsigned long mclk;
 437         int divider;
 438         int shift;
 439 };
 440
 441 /* sm501_select_clock
 442  *
 443  * selects nearest discrete clock frequency the SM501 can achive
 444  *   the maximum divisor is 3 or 5
 445  */
 446 static unsigned long sm501_select_clock(unsigned long freq,
 447                                         struct sm501_clock *clock,
 448                                         int max_div)
 449 {
 450         unsigned long mclk;
 451         int divider;
 452         int shift;
 453         long diff;
 454         long best_diff = 999999999;
 455
 456         /* Try 288MHz and 336MHz clocks. */
 457         for (mclk = 288000000; mclk <= 336000000; mclk += 48000000) {
 458                 /* try dividers 1 and 3 for CRT and for panel,
 459                    try divider 5 for panel only.*/
 460
 461                 for (divider = 1; divider <= max_div; divider += 2) {
 462                         /* try all 8 shift values.*/
 463                         for (shift = 0; shift < 8; shift++) {
 464                                 /* Calculate difference to requested clock */
 465                                 diff = sm501fb_round_div(mclk, divider << shift) - freq;
 466                                 if (diff < 0)
 467                                         diff = -diff;
 468
 469                                 /* If it is less than the current, use it */
 470                                 if (diff < best_diff) {
 471                                         best_diff = diff;
 472
 473                                         clock->mclk = mclk;
 474                                         clock->divider = divider;
 475                                         clock->shift = shift;
 476                                 }
 477                         }
 478                 }
 479         }
 480
 481         /* Return best clock. */
 482         return clock->mclk / (clock->divider << clock->shift);
 483 }
 484
 485 /* sm501_set_clock
 486  *
 487  * set one of the four clock sources to the closest available frequency to
 488  *  the one specified
 489 */
 490
 491 unsigned long sm501_set_clock(struct device *dev,
 492                               int clksrc,
 493                               unsigned long req_freq)
 494 {
 495         struct sm501_devdata *sm = dev_get_drvdata(dev);
 496         unsigned long mode = readl(sm->regs + SM501_POWER_MODE_CONTROL);
 497         unsigned long gate = readl(sm->regs + SM501_CURRENT_GATE);
 498         unsigned long clock = readl(sm->regs + SM501_CURRENT_CLOCK);
 499         unsigned char reg;
 500         unsigned long sm501_freq; /* the actual frequency acheived */
 501
 502         struct sm501_clock to;
 503
 504         /* find achivable discrete frequency and setup register value
 505          * accordingly, V2XCLK, MCLK and M1XCLK are the same P2XCLK
 506          * has an extra bit for the divider */
 507
 508         switch (clksrc) {
 509         case SM501_CLOCK_P2XCLK:
 510                 /* This clock is divided in half so to achive the
 511                  * requested frequency the value must be multiplied by
 512                  * 2. This clock also has an additional pre divisor */
 513
 514                 sm501_freq = (sm501_select_clock(2 * req_freq, &to, 5) / 2);
 515                 reg=to.shift & 0x07;/* bottom 3 bits are shift */
 516                 if (to.divider == 3)
 517                         reg |= 0x08; /* /3 divider required */
 518                 else if (to.divider == 5)
 519                         reg |= 0x10; /* /5 divider required */
 520                 if (to.mclk != 288000000)
 521                         reg |= 0x20; /* which mclk pll is source */
 522                 break;
 523
 524         case SM501_CLOCK_V2XCLK:
 525                 /* This clock is divided in half so to achive the
 526                  * requested frequency the value must be multiplied by 2. */
 527
 528                 sm501_freq = (sm501_select_clock(2 * req_freq, &to, 3) / 2);
 529                 reg=to.shift & 0x07;    /* bottom 3 bits are shift */
 530                 if (to.divider == 3)
 531                         reg |= 0x08;    /* /3 divider required */
 532                 if (to.mclk != 288000000)
 533                         reg |= 0x10;    /* which mclk pll is source */
 534                 break;
 535
 536         case SM501_CLOCK_MCLK:
 537         case SM501_CLOCK_M1XCLK:
 538                 /* These clocks are the same and not further divided */
 539
 540                 sm501_freq = sm501_select_clock( req_freq, &to, 3);
 541                 reg=to.shift & 0x07;    /* bottom 3 bits are shift */
 542                 if (to.divider == 3)
 543                         reg |= 0x08;    /* /3 divider required */
 544                 if (to.mclk != 288000000)
 545                         reg |= 0x10;    /* which mclk pll is source */
 546                 break;
 547
 548         default:
 549                 return 0; /* this is bad */
 550         }
 551
 552         mutex_lock(&sm->clock_lock);
 553
 554         mode = readl(sm->regs + SM501_POWER_MODE_CONTROL);
 555         gate = readl(sm->regs + SM501_CURRENT_GATE);
 556         clock = readl(sm->regs + SM501_CURRENT_CLOCK);
 557
 558         clock = clock & ~(0xFF << clksrc);
 559         clock |= reg<<clksrc;
 560
 561         mode &= 3;      /* find current mode */
 562
 563         switch (mode) {
 564         case 1:
 565                 writel(gate, sm->regs + SM501_POWER_MODE_0_GATE);
 566                 writel(clock, sm->regs + SM501_POWER_MODE_0_CLOCK);
 567                 mode = 0;
 568                 break;
 569         case 2:
 570         case 0:
 571                 writel(gate, sm->regs + SM501_POWER_MODE_1_GATE);
 572                 writel(clock, sm->regs + SM501_POWER_MODE_1_CLOCK);
 573                 mode = 1;
 574                 break;
 575
 576         default:
 577                 mutex_unlock(&sm->clock_lock);
 578                 return -1;
 579         }
 580
 581         writel(mode, sm->regs + SM501_POWER_MODE_CONTROL);
 582         sm501_sync_regs(sm);
 583
 584         dev_info(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n",
 585                  gate, clock, mode);
 586
 587         sm501_mdelay(sm, 16);
 588         mutex_unlock(&sm->clock_lock);
 589
 590         sm501_dump_clk(sm);
 591
 592         return sm501_freq;
 593 }
 594
 595 EXPORT_SYMBOL_GPL(sm501_set_clock);
 596
 597 /* sm501_find_clock
 598  *
 599  * finds the closest available frequency for a given clock
 600 */
 601
 602 unsigned long sm501_find_clock(int clksrc,
 603                                unsigned long req_freq)
 604 {
 605         unsigned long sm501_freq; /* the frequency achiveable by the 501 */
 606         struct sm501_clock to;
 607
 608         switch (clksrc) {
 609         case SM501_CLOCK_P2XCLK:
 610                 sm501_freq = (sm501_select_clock(2 * req_freq, &to, 5) / 2);
 611                 break;
 612
 613         case SM501_CLOCK_V2XCLK:
 614                 sm501_freq = (sm501_select_clock(2 * req_freq, &to, 3) / 2);
 615                 break;
 616
 617         case SM501_CLOCK_MCLK:
 618         case SM501_CLOCK_M1XCLK:
 619                 sm501_freq = sm501_select_clock(req_freq, &to, 3);
 620                 break;
 621
 622         default:
 623                 sm501_freq = 0;         /* error */
 624         }
 625
 626         return sm501_freq;
 627 }
 628
 629 EXPORT_SYMBOL_GPL(sm501_find_clock);
 630
 631 static struct sm501_device *to_sm_device(struct platform_device *pdev)
 632 {
 633         return container_of(pdev, struct sm501_device, pdev);
 634 }
 635
 636 /* sm501_device_release
 637  *
 638  * A release function for the platform devices we create to allow us to
 639  * free any items we allocated
 640 */
 641
 642 static void sm501_device_release(struct device *dev)
 643 {
 644         kfree(to_sm_device(to_platform_device(dev)));
 645 }
 646
 647 /* sm501_create_subdev
 648  *
 649  * Create a skeleton platform device with resources for passing to a
 650  * sub-driver
 651 */
 652
 653 static struct platform_device *
 654 sm501_create_subdev(struct sm501_devdata *sm,
 655                     char *name, unsigned int res_count)
 656 {
 657         struct sm501_device *smdev;
 658
 659         smdev = kzalloc(sizeof(struct sm501_device) +
 660                         sizeof(struct resource) * res_count, GFP_KERNEL);
 661         if (!smdev)
 662                 return NULL;
 663
 664         smdev->pdev.dev.release = sm501_device_release;
 665
 666         smdev->pdev.name = name;
 667         smdev->pdev.id = sm->pdev_id;
 668         smdev->pdev.resource = (struct resource *)(smdev+1);
 669         smdev->pdev.num_resources = res_count;
 670
 671         smdev->pdev.dev.parent = sm->dev;
 672
 673         return &smdev->pdev;
 674 }
 675
 676 /* sm501_register_device
 677  *
 678  * Register a platform device created with sm501_create_subdev()
 679 */
 680
 681 static int sm501_register_device(struct sm501_devdata *sm,
 682                                  struct platform_device *pdev)
 683 {
 684         struct sm501_device *smdev = to_sm_device(pdev);
 685         int ptr;
 686         int ret;
 687
 688         for (ptr = 0; ptr < pdev->num_resources; ptr++) {
 689                 printk("%s[%d] flags %08lx: %08llx..%08llx\n",
 690                        pdev->name, ptr,
 691                        pdev->resource[ptr].flags,
 692                        (unsigned long long)pdev->resource[ptr].start,
 693                        (unsigned long long)pdev->resource[ptr].end);
 694         }
 695
 696         ret = platform_device_register(pdev);
 697
 698         if (ret >= 0) {
 699                 dev_dbg(sm->dev, "registered %s\n", pdev->name);
 700                 list_add_tail(&smdev->list, &sm->devices);
 701         } else
 702                 dev_err(sm->dev, "error registering %s (%d)\n",
 703                         pdev->name, ret);
 704
 705         return ret;
 706 }
 707
 708 /* sm501_create_subio
 709  *
 710  * Fill in an IO resource for a sub device
 711 */
 712
 713 static void sm501_create_subio(struct sm501_devdata *sm,
 714                                struct resource *res,
 715                                resource_size_t offs,
 716                                resource_size_t size)
 717 {
 718         res->flags = IORESOURCE_MEM;
 719         res->parent = sm->io_res;
 720         res->start = sm->io_res->start + offs;
 721         res->end = res->start + size - 1;
 722 }
 723
 724 /* sm501_create_mem
 725  *
 726  * Fill in an MEM resource for a sub device
 727 */
 728
 729 static void sm501_create_mem(struct sm501_devdata *sm,
 730                              struct resource *res,
 731                              resource_size_t *offs,
 732                              resource_size_t size)
 733 {
 734         *offs -= size;          /* adjust memory size */
 735
 736         res->flags = IORESOURCE_MEM;
 737         res->parent = sm->mem_res;
 738         res->start = sm->mem_res->start + *offs;
 739         res->end = res->start + size - 1;
 740 }
 741
 742 /* sm501_create_irq
 743  *
 744  * Fill in an IRQ resource for a sub device
 745 */
 746
 747 static void sm501_create_irq(struct sm501_devdata *sm,
 748                              struct resource *res)
 749 {
 750         res->flags = IORESOURCE_IRQ;
 751         res->parent = NULL;
 752         res->start = res->end = sm->irq;
 753 }
 754
 755 static int sm501_register_usbhost(struct sm501_devdata *sm,
 756                                   resource_size_t *mem_avail)
 757 {
 758         struct platform_device *pdev;
 759
 760         pdev = sm501_create_subdev(sm, "sm501-usb", 3);
 761         if (!pdev)
 762                 return -ENOMEM;
 763
 764         sm501_create_subio(sm, &pdev->resource[0], 0x40000, 0x20000);
 765         sm501_create_mem(sm, &pdev->resource[1], mem_avail, 256*1024);
 766         sm501_create_irq(sm, &pdev->resource[2]);
 767
 768         return sm501_register_device(sm, pdev);
 769 }
 770
 771 static int sm501_register_display(struct sm501_devdata *sm,
 772                                   resource_size_t *mem_avail)
 773 {
 774         struct platform_device *pdev;
 775
 776         pdev = sm501_create_subdev(sm, "sm501-fb", 4);
 777         if (!pdev)
 778                 return -ENOMEM;
 779
 780         sm501_create_subio(sm, &pdev->resource[0], 0x80000, 0x10000);
 781         sm501_create_subio(sm, &pdev->resource[1], 0x100000, 0x50000);
 782         sm501_create_mem(sm, &pdev->resource[2], mem_avail, *mem_avail);
 783         sm501_create_irq(sm, &pdev->resource[3]);
 784
 785         return sm501_register_device(sm, pdev);
 786 }
 787
 788 /* sm501_dbg_regs
 789  *
 790  * Debug attribute to attach to parent device to show core registers
 791 */
 792
 793 static ssize_t sm501_dbg_regs(struct device *dev,
 794                               struct device_attribute *attr, char *buff)
 795 {
 796         struct sm501_devdata *sm = dev_get_drvdata(dev) ;
 797         unsigned int reg;
 798         char *ptr = buff;
 799         int ret;
 800
 801         for (reg = 0x00; reg < 0x70; reg += 4) {
 802                 ret = sprintf(ptr, "%08x = %08x\n",
 803                               reg, readl(sm->regs + reg));
 804                 ptr += ret;
 805         }
 806
 807         return ptr - buff;
 808 }
 809
 810
 811 static DEVICE_ATTR(dbg_regs, 0666, sm501_dbg_regs, NULL);
 812
 813 /* sm501_init_reg
 814  *
 815  * Helper function for the init code to setup a register
 816  *
 817  * clear the bits which are set in r->mask, and then set
 818  * the bits set in r->set.
 819 */
 820
 821 static inline void sm501_init_reg(struct sm501_devdata *sm,
 822                                   unsigned long reg,
 823                                   struct sm501_reg_init *r)
 824 {
 825         unsigned long tmp;
 826
 827         tmp = readl(sm->regs + reg);
 828         tmp &= ~r->mask;
 829         tmp |= r->set;
 830         writel(tmp, sm->regs + reg);
 831 }
 832
 833 /* sm501_init_regs
 834  *
 835  * Setup core register values
 836 */
 837
 838 static void sm501_init_regs(struct sm501_devdata *sm,
 839                             struct sm501_initdata *init)
 840 {
 841         sm501_misc_control(sm->dev,
 842                            init->misc_control.set,
 843                            init->misc_control.mask);
 844
 845         sm501_init_reg(sm, SM501_MISC_TIMING, &init->misc_timing);
 846         sm501_init_reg(sm, SM501_GPIO31_0_CONTROL, &init->gpio_low);
 847         sm501_init_reg(sm, SM501_GPIO63_32_CONTROL, &init->gpio_high);
 848
 849         if (init->m1xclk) {
 850                 dev_info(sm->dev, "setting M1XCLK to %ld\n", init->m1xclk);
 851                 sm501_set_clock(sm->dev, SM501_CLOCK_M1XCLK, init->m1xclk);
 852         }
 853
 854         if (init->mclk) {
 855                 dev_info(sm->dev, "setting MCLK to %ld\n", init->mclk);
 856                 sm501_set_clock(sm->dev, SM501_CLOCK_MCLK, init->mclk);
 857         }
 858
 859 }
 860
 861 /* Check the PLL sources for the M1CLK and M1XCLK
 862  *
 863  * If the M1CLK and M1XCLKs are not sourced from the same PLL, then
 864  * there is a risk (see errata AB-5) that the SM501 will cease proper
 865  * function. If this happens, then it is likely the SM501 will
 866  * hang the system.
 867 */
 868
 869 static int sm501_check_clocks(struct sm501_devdata *sm)
 870 {
 871         unsigned long pwrmode = readl(sm->regs + SM501_CURRENT_CLOCK);
 872         unsigned long msrc = (pwrmode & SM501_POWERMODE_M_SRC);
 873         unsigned long m1src = (pwrmode & SM501_POWERMODE_M1_SRC);
 874
 875         return ((msrc == 0 && m1src != 0) || (msrc != 0 && m1src == 0));
 876 }
 877
 878 static unsigned int sm501_mem_local[] = {
 879         [0]     = 4*1024*1024,
 880         [1]     = 8*1024*1024,
 881         [2]     = 16*1024*1024,
 882         [3]     = 32*1024*1024,
 883         [4]     = 64*1024*1024,
 884         [5]     = 2*1024*1024,
 885 };
 886
 887 /* sm501_init_dev
 888  *
 889  * Common init code for an SM501
 890 */
 891
 892 static int sm501_init_dev(struct sm501_devdata *sm)
 893 {
 894         resource_size_t mem_avail;
 895         unsigned long dramctrl;
 896         unsigned long devid;
 897         int ret;
 898
 899         mutex_init(&sm->clock_lock);
 900         spin_lock_init(&sm->reg_lock);
 901
 902         INIT_LIST_HEAD(&sm->devices);
 903
 904         devid = readl(sm->regs + SM501_DEVICEID);
 905
 906         if ((devid & SM501_DEVICEID_IDMASK) != SM501_DEVICEID_SM501) {
 907                 dev_err(sm->dev, "incorrect device id %08lx\n", devid);
 908                 return -EINVAL;
 909         }
 910
 911         dramctrl = readl(sm->regs + SM501_DRAM_CONTROL);
 912         mem_avail = sm501_mem_local[(dramctrl >> 13) & 0x7];
 913
 914         dev_info(sm->dev, "SM501 At %p: Version %08lx, %ld Mb, IRQ %d\n",
 915                  sm->regs, devid, (unsigned long)mem_avail >> 20, sm->irq);
 916
 917         sm501_dump_gate(sm);
 918
 919         ret = device_create_file(sm->dev, &dev_attr_dbg_regs);
 920         if (ret)
 921                 dev_err(sm->dev, "failed to create debug regs file\n");
 922
 923         sm501_dump_clk(sm);
 924
 925         /* check to see if we have some device initialisation */
 926
 927         if (sm->platdata) {
 928                 struct sm501_platdata *pdata = sm->platdata;
 929
 930                 if (pdata->init) {
 931                         sm501_init_regs(sm, sm->platdata->init);
 932
 933                         if (pdata->init->devices & SM501_USE_USB_HOST)
 934                                 sm501_register_usbhost(sm, &mem_avail);
 935                 }
 936         }
 937
 938         ret = sm501_check_clocks(sm);
 939         if (ret) {
 940                 dev_err(sm->dev, "M1X and M clocks sourced from different "
 941                                         "PLLs\n");
 942                 return -EINVAL;
 943         }
 944
 945         /* always create a framebuffer */
 946         sm501_register_display(sm, &mem_avail);
 947
 948         return 0;
 949 }
 950
 951 static int sm501_plat_probe(struct platform_device *dev)
 952 {
 953         struct sm501_devdata *sm;
 954         int err;
 955
 956         sm = kzalloc(sizeof(struct sm501_devdata), GFP_KERNEL);
 957         if (sm == NULL) {
 958                 dev_err(&dev->dev, "no memory for device data\n");
 959                 err = -ENOMEM;
 960                 goto err1;
 961         }
 962
 963         sm->dev = &dev->dev;
 964         sm->pdev_id = dev->id;
 965         sm->irq = platform_get_irq(dev, 0);
 966         sm->io_res = platform_get_resource(dev, IORESOURCE_MEM, 1);
 967         sm->mem_res = platform_get_resource(dev, IORESOURCE_MEM, 0);
 968         sm->platdata = dev->dev.platform_data;
 969
 970         if (sm->irq < 0) {
 971                 dev_err(&dev->dev, "failed to get irq resource\n");
 972                 err = sm->irq;
 973                 goto err_res;
 974         }
 975
 976         if (sm->io_res == NULL || sm->mem_res == NULL) {
 977                 dev_err(&dev->dev, "failed to get IO resource\n");
 978                 err = -ENOENT;
 979                 goto err_res;
 980         }
 981
 982         sm->regs_claim = request_mem_region(sm->io_res->start,
 983                                             0x100, "sm501");
 984
 985         if (sm->regs_claim == NULL) {
 986                 dev_err(&dev->dev, "cannot claim registers\n");
 987                 err= -EBUSY;
 988                 goto err_res;
 989         }
 990
 991         platform_set_drvdata(dev, sm);
 992
 993         sm->regs = ioremap(sm->io_res->start,
 994                            (sm->io_res->end - sm->io_res->start) - 1);
 995
 996         if (sm->regs == NULL) {
 997                 dev_err(&dev->dev, "cannot remap registers\n");
 998                 err = -EIO;
 999                 goto err_claim;
1000         }
1001
1002         return sm501_init_dev(sm);
1003
1004  err_claim:
1005         release_resource(sm->regs_claim);
1006         kfree(sm->regs_claim);
1007  err_res:
1008         kfree(sm);
1009  err1:
1010         return err;
1011
1012 }
1013
1014 #ifdef CONFIG_PM
1015 /* power management support */
1016
1017 static int sm501_plat_suspend(struct platform_device *pdev, pm_message_t state)
1018 {
1019         struct sm501_devdata *sm = platform_get_drvdata(pdev);
1020
1021         sm->in_suspend = 1;
1022         sm->pm_misc = readl(sm->regs + SM501_MISC_CONTROL);
1023
1024         sm501_dump_regs(sm);
1025         return 0;
1026 }
1027
1028 static int sm501_plat_resume(struct platform_device *pdev)
1029 {
1030         struct sm501_devdata *sm = platform_get_drvdata(pdev);
1031
1032         sm501_dump_regs(sm);
1033         sm501_dump_gate(sm);
1034         sm501_dump_clk(sm);
1035
1036         /* check to see if we are in the same state as when suspended */
1037
1038         if (readl(sm->regs + SM501_MISC_CONTROL) != sm->pm_misc) {
1039                 dev_info(sm->dev, "SM501_MISC_CONTROL changed over sleep\n");
1040                 writel(sm->pm_misc, sm->regs + SM501_MISC_CONTROL);
1041
1042                 /* our suspend causes the controller state to change,
1043                  * either by something attempting setup, power loss,
1044                  * or an external reset event on power change */
1045
1046                 if (sm->platdata && sm->platdata->init) {
1047                         sm501_init_regs(sm, sm->platdata->init);
1048                 }
1049         }
1050
1051         /* dump our state from resume */
1052
1053         sm501_dump_regs(sm);
1054         sm501_dump_clk(sm);
1055
1056         sm->in_suspend = 0;
1057
1058         return 0;
1059 }
1060 #else
1061 #define sm501_plat_suspend NULL
1062 #define sm501_plat_resume NULL
1063 #endif
1064
1065 /* Initialisation data for PCI devices */
1066
1067 static struct sm501_initdata sm501_pci_initdata = {
1068         .gpio_high      = {
1069                 .set    = 0x3F000000,           /* 24bit panel */
1070                 .mask   = 0x0,
1071         },
1072         .misc_timing    = {
1073                 .set    = 0x010100,             /* SDRAM timing */
1074                 .mask   = 0x1F1F00,
1075         },
1076         .misc_control   = {
1077                 .set    = SM501_MISC_PNL_24BIT,
1078                 .mask   = 0,
1079         },
1080
1081         .devices        = SM501_USE_ALL,
1082
1083         /* Errata AB-3 says that 72MHz is the fastest available
1084          * for 33MHZ PCI with proper bus-mastering operation */
1085
1086         .mclk           = 72 * MHZ,
1087         .m1xclk         = 144 * MHZ,
1088 };
1089
1090 static struct sm501_platdata_fbsub sm501_pdata_fbsub = {
1091         .flags          = (SM501FB_FLAG_USE_INIT_MODE |
1092                            SM501FB_FLAG_USE_HWCURSOR |
1093                            SM501FB_FLAG_USE_HWACCEL |
1094                            SM501FB_FLAG_DISABLE_AT_EXIT),
1095 };
1096
1097 static struct sm501_platdata_fb sm501_fb_pdata = {
1098         .fb_route       = SM501_FB_OWN,
1099         .fb_crt         = &sm501_pdata_fbsub,
1100         .fb_pnl         = &sm501_pdata_fbsub,
1101 };
1102
1103 static struct sm501_platdata sm501_pci_platdata = {
1104         .init           = &sm501_pci_initdata,
1105         .fb             = &sm501_fb_pdata,
1106 };
1107
1108 static int sm501_pci_probe(struct pci_dev *dev,
1109                            const struct pci_device_id *id)
1110 {
1111         struct sm501_devdata *sm;
1112         int err;
1113
1114         sm = kzalloc(sizeof(struct sm501_devdata), GFP_KERNEL);
1115         if (sm == NULL) {
1116                 dev_err(&dev->dev, "no memory for device data\n");
1117                 err = -ENOMEM;
1118                 goto err1;
1119         }
1120
1121         /* set a default set of platform data */
1122         dev->dev.platform_data = sm->platdata = &sm501_pci_platdata;
1123
1124         /* set a hopefully unique id for our child platform devices */
1125         sm->pdev_id = 32 + dev->devfn;
1126
1127         pci_set_drvdata(dev, sm);
1128
1129         err = pci_enable_device(dev);
1130         if (err) {
1131                 dev_err(&dev->dev, "cannot enable device\n");
1132                 goto err2;
1133         }
1134
1135         sm->dev = &dev->dev;
1136         sm->irq = dev->irq;
1137
1138 #ifdef __BIG_ENDIAN
1139         /* if the system is big-endian, we most probably have a
1140          * translation in the IO layer making the PCI bus little endian
1141          * so make the framebuffer swapped pixels */
1142
1143         sm501_fb_pdata.flags |= SM501_FBPD_SWAP_FB_ENDIAN;
1144 #endif
1145
1146         /* check our resources */
1147
1148         if (!(pci_resource_flags(dev, 0) & IORESOURCE_MEM)) {
1149                 dev_err(&dev->dev, "region #0 is not memory?\n");
1150                 err = -EINVAL;
1151                 goto err3;
1152         }
1153
1154         if (!(pci_resource_flags(dev, 1) & IORESOURCE_MEM)) {
1155                 dev_err(&dev->dev, "region #1 is not memory?\n");
1156                 err = -EINVAL;
1157                 goto err3;
1158         }
1159
1160         /* make our resources ready for sharing */
1161
1162         sm->io_res = &dev->resource[1];
1163         sm->mem_res = &dev->resource[0];
1164
1165         sm->regs_claim = request_mem_region(sm->io_res->start,
1166                                             0x100, "sm501");
1167         if (sm->regs_claim == NULL) {
1168                 dev_err(&dev->dev, "cannot claim registers\n");
1169                 err= -EBUSY;
1170                 goto err3;
1171         }
1172
1173         sm->regs = ioremap(pci_resource_start(dev, 1),
1174                            pci_resource_len(dev, 1));
1175
1176         if (sm->regs == NULL) {
1177                 dev_err(&dev->dev, "cannot remap registers\n");
1178                 err = -EIO;
1179                 goto err4;
1180         }
1181
1182         sm501_init_dev(sm);
1183         return 0;
1184
1185  err4:
1186         release_resource(sm->regs_claim);
1187         kfree(sm->regs_claim);
1188  err3:
1189         pci_disable_device(dev);
1190  err2:
1191         pci_set_drvdata(dev, NULL);
1192         kfree(sm);
1193  err1:
1194         return err;
1195 }
1196
1197 static void sm501_remove_sub(struct sm501_devdata *sm,
1198                              struct sm501_device *smdev)
1199 {
1200         list_del(&smdev->list);
1201         platform_device_unregister(&smdev->pdev);
1202 }
1203
1204 static void sm501_dev_remove(struct sm501_devdata *sm)
1205 {
1206         struct sm501_device *smdev, *tmp;
1207
1208         list_for_each_entry_safe(smdev, tmp, &sm->devices, list)
1209                 sm501_remove_sub(sm, smdev);
1210
1211         device_remove_file(sm->dev, &dev_attr_dbg_regs);
1212 }
1213
1214 static void sm501_pci_remove(struct pci_dev *dev)
1215 {
1216         struct sm501_devdata *sm = pci_get_drvdata(dev);
1217
1218         sm501_dev_remove(sm);
1219         iounmap(sm->regs);
1220
1221         release_resource(sm->regs_claim);
1222         kfree(sm->regs_claim);
1223
1224         pci_set_drvdata(dev, NULL);
1225         pci_disable_device(dev);
1226 }
1227
1228 static int sm501_plat_remove(struct platform_device *dev)
1229 {
1230         struct sm501_devdata *sm = platform_get_drvdata(dev);
1231
1232         sm501_dev_remove(sm);
1233         iounmap(sm->regs);
1234
1235         release_resource(sm->regs_claim);
1236         kfree(sm->regs_claim);
1237
1238         return 0;
1239 }
1240
1241 static struct pci_device_id sm501_pci_tbl[] = {
1242         { 0x126f, 0x0501, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
1243         { 0, },
1244 };
1245
1246 MODULE_DEVICE_TABLE(pci, sm501_pci_tbl);
1247
1248 static struct pci_driver sm501_pci_drv = {
1249         .name           = "sm501",
1250         .id_table       = sm501_pci_tbl,
1251         .probe          = sm501_pci_probe,
1252         .remove         = sm501_pci_remove,
1253 };
1254
1255 static struct platform_driver sm501_plat_drv = {
1256         .driver         = {
1257                 .name   = "sm501",
1258                 .owner  = THIS_MODULE,
1259         },
1260         .probe          = sm501_plat_probe,
1261         .remove         = sm501_plat_remove,
1262         .suspend        = sm501_plat_suspend,
1263         .resume         = sm501_plat_resume,
1264 };
1265
1266 static int __init sm501_base_init(void)
1267 {
1268         platform_driver_register(&sm501_plat_drv);
1269         return pci_register_driver(&sm501_pci_drv);
1270 }
1271
1272 static void __exit sm501_base_exit(void)
1273 {
1274         platform_driver_unregister(&sm501_plat_drv);
1275         pci_unregister_driver(&sm501_pci_drv);
1276 }
1277
1278 module_init(sm501_base_init);
1279 module_exit(sm501_base_exit);
1280
1281 MODULE_DESCRIPTION("SM501 Core Driver");
1282 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>, Vincent Sanders");
1283 MODULE_LICENSE("GPL v2");