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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 #include <linux/i2c-gpio.h>
  23
  24 #include <linux/sm501.h>
  25 #include <linux/sm501-regs.h>
  26 #include <linux/serial_8250.h>
  27
  28 #include <asm/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 };
  45
  46 struct sm501_gpio {
  47         struct sm501_gpio_chip  low;
  48         struct sm501_gpio_chip  high;
  49         spinlock_t              lock;
  50
  51         unsigned int             registered : 1;
  52         void __iomem            *regs;
  53         struct resource         *regs_res;
  54 };
  55 #else
  56 struct sm501_gpio {
  57         /* no gpio support, empty definition for sm501_devdata. */
  58 };
  59 #endif
  60
  61 struct sm501_devdata {
  62         spinlock_t                       reg_lock;
  63         struct mutex                     clock_lock;
  64         struct list_head                 devices;
  65         struct sm501_gpio                gpio;
  66
  67         struct device                   *dev;
  68         struct resource                 *io_res;
  69         struct resource                 *mem_res;
  70         struct resource                 *regs_claim;
  71         struct sm501_platdata           *platdata;
  72
  73
  74         unsigned int                     in_suspend;
  75         unsigned long                    pm_misc;
  76
  77         int                              unit_power[20];
  78         unsigned int                     pdev_id;
  79         unsigned int                     irq;
  80         void __iomem                    *regs;
  81         unsigned int                     rev;
  82 };
  83
  84
  85 #define MHZ (1000 * 1000)
  86
  87 #ifdef DEBUG
  88 static const unsigned int div_tab[] = {
  89         [0]             = 1,
  90         [1]             = 2,
  91         [2]             = 4,
  92         [3]             = 8,
  93         [4]             = 16,
  94         [5]             = 32,
  95         [6]             = 64,
  96         [7]             = 128,
  97         [8]             = 3,
  98         [9]             = 6,
  99         [10]            = 12,
 100         [11]            = 24,
 101         [12]            = 48,
 102         [13]            = 96,
 103         [14]            = 192,
 104         [15]            = 384,
 105         [16]            = 5,
 106         [17]            = 10,
 107         [18]            = 20,
 108         [19]            = 40,
 109         [20]            = 80,
 110         [21]            = 160,
 111         [22]            = 320,
 112         [23]            = 604,
 113 };
 114
 115 static unsigned long decode_div(unsigned long pll2, unsigned long val,
 116                                 unsigned int lshft, unsigned int selbit,
 117                                 unsigned long mask)
 118 {
 119         if (val & selbit)
 120                 pll2 = 288 * MHZ;
 121
 122         return pll2 / div_tab[(val >> lshft) & mask];
 123 }
 124
 125 #define fmt_freq(x) ((x) / MHZ), ((x) % MHZ), (x)
 126
 127 /* sm501_dump_clk
 128  *
 129  * Print out the current clock configuration for the device
 130 */
 131
 132 static void sm501_dump_clk(struct sm501_devdata *sm)
 133 {
 134         unsigned long misct = readl(sm->regs + SM501_MISC_TIMING);
 135         unsigned long pm0 = readl(sm->regs + SM501_POWER_MODE_0_CLOCK);
 136         unsigned long pm1 = readl(sm->regs + SM501_POWER_MODE_1_CLOCK);
 137         unsigned long pmc = readl(sm->regs + SM501_POWER_MODE_CONTROL);
 138         unsigned long sdclk0, sdclk1;
 139         unsigned long pll2 = 0;
 140
 141         switch (misct & 0x30) {
 142         case 0x00:
 143                 pll2 = 336 * MHZ;
 144                 break;
 145         case 0x10:
 146                 pll2 = 288 * MHZ;
 147                 break;
 148         case 0x20:
 149                 pll2 = 240 * MHZ;
 150                 break;
 151         case 0x30:
 152                 pll2 = 192 * MHZ;
 153                 break;
 154         }
 155
 156         sdclk0 = (misct & (1<<12)) ? pll2 : 288 * MHZ;
 157         sdclk0 /= div_tab[((misct >> 8) & 0xf)];
 158
 159         sdclk1 = (misct & (1<<20)) ? pll2 : 288 * MHZ;
 160         sdclk1 /= div_tab[((misct >> 16) & 0xf)];
 161
 162         dev_dbg(sm->dev, "MISCT=%08lx, PM0=%08lx, PM1=%08lx\n",
 163                 misct, pm0, pm1);
 164
 165         dev_dbg(sm->dev, "PLL2 = %ld.%ld MHz (%ld), SDCLK0=%08lx, SDCLK1=%08lx\n",
 166                 fmt_freq(pll2), sdclk0, sdclk1);
 167
 168         dev_dbg(sm->dev, "SDRAM: PM0=%ld, PM1=%ld\n", sdclk0, sdclk1);
 169
 170         dev_dbg(sm->dev, "PM0[%c]: "
 171                  "P2 %ld.%ld MHz (%ld), V2 %ld.%ld (%ld), "
 172                  "M %ld.%ld (%ld), MX1 %ld.%ld (%ld)\n",
 173                  (pmc & 3 ) == 0 ? '*' : '-',
 174                  fmt_freq(decode_div(pll2, pm0, 24, 1<<29, 31)),
 175                  fmt_freq(decode_div(pll2, pm0, 16, 1<<20, 15)),
 176                  fmt_freq(decode_div(pll2, pm0, 8,  1<<12, 15)),
 177                  fmt_freq(decode_div(pll2, pm0, 0,  1<<4,  15)));
 178
 179         dev_dbg(sm->dev, "PM1[%c]: "
 180                 "P2 %ld.%ld MHz (%ld), V2 %ld.%ld (%ld), "
 181                 "M %ld.%ld (%ld), MX1 %ld.%ld (%ld)\n",
 182                 (pmc & 3 ) == 1 ? '*' : '-',
 183                 fmt_freq(decode_div(pll2, pm1, 24, 1<<29, 31)),
 184                 fmt_freq(decode_div(pll2, pm1, 16, 1<<20, 15)),
 185                 fmt_freq(decode_div(pll2, pm1, 8,  1<<12, 15)),
 186                 fmt_freq(decode_div(pll2, pm1, 0,  1<<4,  15)));
 187 }
 188
 189 static void sm501_dump_regs(struct sm501_devdata *sm)
 190 {
 191         void __iomem *regs = sm->regs;
 192
 193         dev_info(sm->dev, "System Control   %08x\n",
 194                         readl(regs + SM501_SYSTEM_CONTROL));
 195         dev_info(sm->dev, "Misc Control     %08x\n",
 196                         readl(regs + SM501_MISC_CONTROL));
 197         dev_info(sm->dev, "GPIO Control Low %08x\n",
 198                         readl(regs + SM501_GPIO31_0_CONTROL));
 199         dev_info(sm->dev, "GPIO Control Hi  %08x\n",
 200                         readl(regs + SM501_GPIO63_32_CONTROL));
 201         dev_info(sm->dev, "DRAM Control     %08x\n",
 202                         readl(regs + SM501_DRAM_CONTROL));
 203         dev_info(sm->dev, "Arbitration Ctrl %08x\n",
 204                         readl(regs + SM501_ARBTRTN_CONTROL));
 205         dev_info(sm->dev, "Misc Timing      %08x\n",
 206                         readl(regs + SM501_MISC_TIMING));
 207 }
 208
 209 static void sm501_dump_gate(struct sm501_devdata *sm)
 210 {
 211         dev_info(sm->dev, "CurrentGate      %08x\n",
 212                         readl(sm->regs + SM501_CURRENT_GATE));
 213         dev_info(sm->dev, "CurrentClock     %08x\n",
 214                         readl(sm->regs + SM501_CURRENT_CLOCK));
 215         dev_info(sm->dev, "PowerModeControl %08x\n",
 216                         readl(sm->regs + SM501_POWER_MODE_CONTROL));
 217 }
 218
 219 #else
 220 static inline void sm501_dump_gate(struct sm501_devdata *sm) { }
 221 static inline void sm501_dump_regs(struct sm501_devdata *sm) { }
 222 static inline void sm501_dump_clk(struct sm501_devdata *sm) { }
 223 #endif
 224
 225 /* sm501_sync_regs
 226  *
 227  * ensure the
 228 */
 229
 230 static void sm501_sync_regs(struct sm501_devdata *sm)
 231 {
 232         readl(sm->regs);
 233 }
 234
 235 static inline void sm501_mdelay(struct sm501_devdata *sm, unsigned int delay)
 236 {
 237         /* during suspend/resume, we are currently not allowed to sleep,
 238          * so change to using mdelay() instead of msleep() if we
 239          * are in one of these paths */
 240
 241         if (sm->in_suspend)
 242                 mdelay(delay);
 243         else
 244                 msleep(delay);
 245 }
 246
 247 /* sm501_misc_control
 248  *
 249  * alters the miscellaneous control parameters
 250 */
 251
 252 int sm501_misc_control(struct device *dev,
 253                        unsigned long set, unsigned long clear)
 254 {
 255         struct sm501_devdata *sm = dev_get_drvdata(dev);
 256         unsigned long misc;
 257         unsigned long save;
 258         unsigned long to;
 259
 260         spin_lock_irqsave(&sm->reg_lock, save);
 261
 262         misc = readl(sm->regs + SM501_MISC_CONTROL);
 263         to = (misc & ~clear) | set;
 264
 265         if (to != misc) {
 266                 writel(to, sm->regs + SM501_MISC_CONTROL);
 267                 sm501_sync_regs(sm);
 268
 269                 dev_dbg(sm->dev, "MISC_CONTROL %08lx\n", misc);
 270         }
 271
 272         spin_unlock_irqrestore(&sm->reg_lock, save);
 273         return to;
 274 }
 275
 276 EXPORT_SYMBOL_GPL(sm501_misc_control);
 277
 278 /* sm501_modify_reg
 279  *
 280  * Modify a register in the SM501 which may be shared with other
 281  * drivers.
 282 */
 283
 284 unsigned long sm501_modify_reg(struct device *dev,
 285                                unsigned long reg,
 286                                unsigned long set,
 287                                unsigned long clear)
 288 {
 289         struct sm501_devdata *sm = dev_get_drvdata(dev);
 290         unsigned long data;
 291         unsigned long save;
 292
 293         spin_lock_irqsave(&sm->reg_lock, save);
 294
 295         data = readl(sm->regs + reg);
 296         data |= set;
 297         data &= ~clear;
 298
 299         writel(data, sm->regs + reg);
 300         sm501_sync_regs(sm);
 301
 302         spin_unlock_irqrestore(&sm->reg_lock, save);
 303
 304         return data;
 305 }
 306
 307 EXPORT_SYMBOL_GPL(sm501_modify_reg);
 308
 309 /* sm501_unit_power
 310  *
 311  * alters the power active gate to set specific units on or off
 312  */
 313
 314 int sm501_unit_power(struct device *dev, unsigned int unit, unsigned int to)
 315 {
 316         struct sm501_devdata *sm = dev_get_drvdata(dev);
 317         unsigned long mode;
 318         unsigned long gate;
 319         unsigned long clock;
 320
 321         mutex_lock(&sm->clock_lock);
 322
 323         mode = readl(sm->regs + SM501_POWER_MODE_CONTROL);
 324         gate = readl(sm->regs + SM501_CURRENT_GATE);
 325         clock = readl(sm->regs + SM501_CURRENT_CLOCK);
 326
 327         mode &= 3;              /* get current power mode */
 328
 329         if (unit >= ARRAY_SIZE(sm->unit_power)) {
 330                 dev_err(dev, "%s: bad unit %d\n", __func__, unit);
 331                 goto already;
 332         }
 333
 334         dev_dbg(sm->dev, "%s: unit %d, cur %d, to %d\n", __func__, unit,
 335                 sm->unit_power[unit], to);
 336
 337         if (to == 0 && sm->unit_power[unit] == 0) {
 338                 dev_err(sm->dev, "unit %d is already shutdown\n", unit);
 339                 goto already;
 340         }
 341
 342         sm->unit_power[unit] += to ? 1 : -1;
 343         to = sm->unit_power[unit] ? 1 : 0;
 344
 345         if (to) {
 346                 if (gate & (1 << unit))
 347                         goto already;
 348                 gate |= (1 << unit);
 349         } else {
 350                 if (!(gate & (1 << unit)))
 351                         goto already;
 352                 gate &= ~(1 << unit);
 353         }
 354
 355         switch (mode) {
 356         case 1:
 357                 writel(gate, sm->regs + SM501_POWER_MODE_0_GATE);
 358                 writel(clock, sm->regs + SM501_POWER_MODE_0_CLOCK);
 359                 mode = 0;
 360                 break;
 361         case 2:
 362         case 0:
 363                 writel(gate, sm->regs + SM501_POWER_MODE_1_GATE);
 364                 writel(clock, sm->regs + SM501_POWER_MODE_1_CLOCK);
 365                 mode = 1;
 366                 break;
 367
 368         default:
 369                 return -1;
 370         }
 371
 372         writel(mode, sm->regs + SM501_POWER_MODE_CONTROL);
 373         sm501_sync_regs(sm);
 374
 375         dev_dbg(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n",
 376                 gate, clock, mode);
 377
 378         sm501_mdelay(sm, 16);
 379
 380  already:
 381         mutex_unlock(&sm->clock_lock);
 382         return gate;
 383 }
 384
 385 EXPORT_SYMBOL_GPL(sm501_unit_power);
 386
 387
 388 /* Perform a rounded division. */
 389 static long sm501fb_round_div(long num, long denom)
 390 {
 391         /* n / d + 1 / 2 = (2n + d) / 2d */
 392         return (2 * num + denom) / (2 * denom);
 393 }
 394
 395 /* clock value structure. */
 396 struct sm501_clock {
 397         unsigned long mclk;
 398         int divider;
 399         int shift;
 400         unsigned int m, n, k;
 401 };
 402
 403 /* sm501_calc_clock
 404  *
 405  * Calculates the nearest discrete clock frequency that
 406  * can be achieved with the specified input clock.
 407  *   the maximum divisor is 3 or 5
 408  */
 409
 410 static int sm501_calc_clock(unsigned long freq,
 411                             struct sm501_clock *clock,
 412                             int max_div,
 413                             unsigned long mclk,
 414                             long *best_diff)
 415 {
 416         int ret = 0;
 417         int divider;
 418         int shift;
 419         long diff;
 420
 421         /* try dividers 1 and 3 for CRT and for panel,
 422            try divider 5 for panel only.*/
 423
 424         for (divider = 1; divider <= max_div; divider += 2) {
 425                 /* try all 8 shift values.*/
 426                 for (shift = 0; shift < 8; shift++) {
 427                         /* Calculate difference to requested clock */
 428                         diff = sm501fb_round_div(mclk, divider << shift) - freq;
 429                         if (diff < 0)
 430                                 diff = -diff;
 431
 432                         /* If it is less than the current, use it */
 433                         if (diff < *best_diff) {
 434                                 *best_diff = diff;
 435
 436                                 clock->mclk = mclk;
 437                                 clock->divider = divider;
 438                                 clock->shift = shift;
 439                                 ret = 1;
 440                         }
 441                 }
 442         }
 443
 444         return ret;
 445 }
 446
 447 /* sm501_calc_pll
 448  *
 449  * Calculates the nearest discrete clock frequency that can be
 450  * achieved using the programmable PLL.
 451  *   the maximum divisor is 3 or 5
 452  */
 453
 454 static unsigned long sm501_calc_pll(unsigned long freq,
 455                                         struct sm501_clock *clock,
 456                                         int max_div)
 457 {
 458         unsigned long mclk;
 459         unsigned int m, n, k;
 460         long best_diff = 999999999;
 461
 462         /*
 463          * The SM502 datasheet doesn't specify the min/max values for M and N.
 464          * N = 1 at least doesn't work in practice.
 465          */
 466         for (m = 2; m <= 255; m++) {
 467                 for (n = 2; n <= 127; n++) {
 468                         for (k = 0; k <= 1; k++) {
 469                                 mclk = (24000000UL * m / n) >> k;
 470
 471                                 if (sm501_calc_clock(freq, clock, max_div,
 472                                                      mclk, &best_diff)) {
 473                                         clock->m = m;
 474                                         clock->n = n;
 475                                         clock->k = k;
 476                                 }
 477                         }
 478                 }
 479         }
 480
 481         /* Return best clock. */
 482         return clock->mclk / (clock->divider << clock->shift);
 483 }
 484
 485 /* sm501_select_clock
 486  *
 487  * Calculates the nearest discrete clock frequency that can be
 488  * achieved using the 288MHz and 336MHz PLLs.
 489  *   the maximum divisor is 3 or 5
 490  */
 491
 492 static unsigned long sm501_select_clock(unsigned long freq,
 493                                         struct sm501_clock *clock,
 494                                         int max_div)
 495 {
 496         unsigned long mclk;
 497         long best_diff = 999999999;
 498
 499         /* Try 288MHz and 336MHz clocks. */
 500         for (mclk = 288000000; mclk <= 336000000; mclk += 48000000) {
 501                 sm501_calc_clock(freq, clock, max_div, mclk, &best_diff);
 502         }
 503
 504         /* Return best clock. */
 505         return clock->mclk / (clock->divider << clock->shift);
 506 }
 507
 508 /* sm501_set_clock
 509  *
 510  * set one of the four clock sources to the closest available frequency to
 511  *  the one specified
 512 */
 513
 514 unsigned long sm501_set_clock(struct device *dev,
 515                               int clksrc,
 516                               unsigned long req_freq)
 517 {
 518         struct sm501_devdata *sm = dev_get_drvdata(dev);
 519         unsigned long mode = readl(sm->regs + SM501_POWER_MODE_CONTROL);
 520         unsigned long gate = readl(sm->regs + SM501_CURRENT_GATE);
 521         unsigned long clock = readl(sm->regs + SM501_CURRENT_CLOCK);
 522         unsigned char reg;
 523         unsigned int pll_reg = 0;
 524         unsigned long sm501_freq; /* the actual frequency acheived */
 525
 526         struct sm501_clock to;
 527
 528         /* find achivable discrete frequency and setup register value
 529          * accordingly, V2XCLK, MCLK and M1XCLK are the same P2XCLK
 530          * has an extra bit for the divider */
 531
 532         switch (clksrc) {
 533         case SM501_CLOCK_P2XCLK:
 534                 /* This clock is divided in half so to achive the
 535                  * requested frequency the value must be multiplied by
 536                  * 2. This clock also has an additional pre divisor */
 537
 538                 if (sm->rev >= 0xC0) {
 539                         /* SM502 -> use the programmable PLL */
 540                         sm501_freq = (sm501_calc_pll(2 * req_freq,
 541                                                      &to, 5) / 2);
 542                         reg = to.shift & 0x07;/* bottom 3 bits are shift */
 543                         if (to.divider == 3)
 544                                 reg |= 0x08; /* /3 divider required */
 545                         else if (to.divider == 5)
 546                                 reg |= 0x10; /* /5 divider required */
 547                         reg |= 0x40; /* select the programmable PLL */
 548                         pll_reg = 0x20000 | (to.k << 15) | (to.n << 8) | to.m;
 549                 } else {
 550                         sm501_freq = (sm501_select_clock(2 * req_freq,
 551                                                          &to, 5) / 2);
 552                         reg = to.shift & 0x07;/* bottom 3 bits are shift */
 553                         if (to.divider == 3)
 554                                 reg |= 0x08; /* /3 divider required */
 555                         else if (to.divider == 5)
 556                                 reg |= 0x10; /* /5 divider required */
 557                         if (to.mclk != 288000000)
 558                                 reg |= 0x20; /* which mclk pll is source */
 559                 }
 560                 break;
 561
 562         case SM501_CLOCK_V2XCLK:
 563                 /* This clock is divided in half so to achive the
 564                  * requested frequency the value must be multiplied by 2. */
 565
 566                 sm501_freq = (sm501_select_clock(2 * req_freq, &to, 3) / 2);
 567                 reg=to.shift & 0x07;    /* bottom 3 bits are shift */
 568                 if (to.divider == 3)
 569                         reg |= 0x08;    /* /3 divider required */
 570                 if (to.mclk != 288000000)
 571                         reg |= 0x10;    /* which mclk pll is source */
 572                 break;
 573
 574         case SM501_CLOCK_MCLK:
 575         case SM501_CLOCK_M1XCLK:
 576                 /* These clocks are the same and not further divided */
 577
 578                 sm501_freq = sm501_select_clock( req_freq, &to, 3);
 579                 reg=to.shift & 0x07;    /* bottom 3 bits are shift */
 580                 if (to.divider == 3)
 581                         reg |= 0x08;    /* /3 divider required */
 582                 if (to.mclk != 288000000)
 583                         reg |= 0x10;    /* which mclk pll is source */
 584                 break;
 585
 586         default:
 587                 return 0; /* this is bad */
 588         }
 589
 590         mutex_lock(&sm->clock_lock);
 591
 592         mode = readl(sm->regs + SM501_POWER_MODE_CONTROL);
 593         gate = readl(sm->regs + SM501_CURRENT_GATE);
 594         clock = readl(sm->regs + SM501_CURRENT_CLOCK);
 595
 596         clock = clock & ~(0xFF << clksrc);
 597         clock |= reg<<clksrc;
 598
 599         mode &= 3;      /* find current mode */
 600
 601         switch (mode) {
 602         case 1:
 603                 writel(gate, sm->regs + SM501_POWER_MODE_0_GATE);
 604                 writel(clock, sm->regs + SM501_POWER_MODE_0_CLOCK);
 605                 mode = 0;
 606                 break;
 607         case 2:
 608         case 0:
 609                 writel(gate, sm->regs + SM501_POWER_MODE_1_GATE);
 610                 writel(clock, sm->regs + SM501_POWER_MODE_1_CLOCK);
 611                 mode = 1;
 612                 break;
 613
 614         default:
 615                 mutex_unlock(&sm->clock_lock);
 616                 return -1;
 617         }
 618
 619         writel(mode, sm->regs + SM501_POWER_MODE_CONTROL);
 620
 621         if (pll_reg)
 622                 writel(pll_reg, sm->regs + SM501_PROGRAMMABLE_PLL_CONTROL);
 623
 624         sm501_sync_regs(sm);
 625
 626         dev_info(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n",
 627                  gate, clock, mode);
 628
 629         sm501_mdelay(sm, 16);
 630         mutex_unlock(&sm->clock_lock);
 631
 632         sm501_dump_clk(sm);
 633
 634         return sm501_freq;
 635 }
 636
 637 EXPORT_SYMBOL_GPL(sm501_set_clock);
 638
 639 /* sm501_find_clock
 640  *
 641  * finds the closest available frequency for a given clock
 642 */
 643
 644 unsigned long sm501_find_clock(struct device *dev,
 645                                int clksrc,
 646                                unsigned long req_freq)
 647 {
 648         struct sm501_devdata *sm = dev_get_drvdata(dev);
 649         unsigned long sm501_freq; /* the frequency achiveable by the 501 */
 650         struct sm501_clock to;
 651
 652         switch (clksrc) {
 653         case SM501_CLOCK_P2XCLK:
 654                 if (sm->rev >= 0xC0) {
 655                         /* SM502 -> use the programmable PLL */
 656                         sm501_freq = (sm501_calc_pll(2 * req_freq,
 657                                                      &to, 5) / 2);
 658                 } else {
 659                         sm501_freq = (sm501_select_clock(2 * req_freq,
 660                                                          &to, 5) / 2);
 661                 }
 662                 break;
 663
 664         case SM501_CLOCK_V2XCLK:
 665                 sm501_freq = (sm501_select_clock(2 * req_freq, &to, 3) / 2);
 666                 break;
 667
 668         case SM501_CLOCK_MCLK:
 669         case SM501_CLOCK_M1XCLK:
 670                 sm501_freq = sm501_select_clock(req_freq, &to, 3);
 671                 break;
 672
 673         default:
 674                 sm501_freq = 0;         /* error */
 675         }
 676
 677         return sm501_freq;
 678 }
 679
 680 EXPORT_SYMBOL_GPL(sm501_find_clock);
 681
 682 static struct sm501_device *to_sm_device(struct platform_device *pdev)
 683 {
 684         return container_of(pdev, struct sm501_device, pdev);
 685 }
 686
 687 /* sm501_device_release
 688  *
 689  * A release function for the platform devices we create to allow us to
 690  * free any items we allocated
 691 */
 692
 693 static void sm501_device_release(struct device *dev)
 694 {
 695         kfree(to_sm_device(to_platform_device(dev)));
 696 }
 697
 698 /* sm501_create_subdev
 699  *
 700  * Create a skeleton platform device with resources for passing to a
 701  * sub-driver
 702 */
 703
 704 static struct platform_device *
 705 sm501_create_subdev(struct sm501_devdata *sm, char *name,
 706                     unsigned int res_count, unsigned int platform_data_size)
 707 {
 708         struct sm501_device *smdev;
 709
 710         smdev = kzalloc(sizeof(struct sm501_device) +
 711                         (sizeof(struct resource) * res_count) +
 712                         platform_data_size, GFP_KERNEL);
 713         if (!smdev)
 714                 return NULL;
 715
 716         smdev->pdev.dev.release = sm501_device_release;
 717
 718         smdev->pdev.name = name;
 719         smdev->pdev.id = sm->pdev_id;
 720         smdev->pdev.dev.parent = sm->dev;
 721
 722         if (res_count) {
 723                 smdev->pdev.resource = (struct resource *)(smdev+1);
 724                 smdev->pdev.num_resources = res_count;
 725         }
 726         if (platform_data_size)
 727                 smdev->pdev.dev.platform_data = (void *)(smdev+1);
 728
 729         return &smdev->pdev;
 730 }
 731
 732 /* sm501_register_device
 733  *
 734  * Register a platform device created with sm501_create_subdev()
 735 */
 736
 737 static int sm501_register_device(struct sm501_devdata *sm,
 738                                  struct platform_device *pdev)
 739 {
 740         struct sm501_device *smdev = to_sm_device(pdev);
 741         int ptr;
 742         int ret;
 743
 744         for (ptr = 0; ptr < pdev->num_resources; ptr++) {
 745                 printk("%s[%d] flags %08lx: %08llx..%08llx\n",
 746                        pdev->name, ptr,
 747                        pdev->resource[ptr].flags,
 748                        (unsigned long long)pdev->resource[ptr].start,
 749                        (unsigned long long)pdev->resource[ptr].end);
 750         }
 751
 752         ret = platform_device_register(pdev);
 753
 754         if (ret >= 0) {
 755                 dev_dbg(sm->dev, "registered %s\n", pdev->name);
 756                 list_add_tail(&smdev->list, &sm->devices);
 757         } else
 758                 dev_err(sm->dev, "error registering %s (%d)\n",
 759                         pdev->name, ret);
 760
 761         return ret;
 762 }
 763
 764 /* sm501_create_subio
 765  *
 766  * Fill in an IO resource for a sub device
 767 */
 768
 769 static void sm501_create_subio(struct sm501_devdata *sm,
 770                                struct resource *res,
 771                                resource_size_t offs,
 772                                resource_size_t size)
 773 {
 774         res->flags = IORESOURCE_MEM;
 775         res->parent = sm->io_res;
 776         res->start = sm->io_res->start + offs;
 777         res->end = res->start + size - 1;
 778 }
 779
 780 /* sm501_create_mem
 781  *
 782  * Fill in an MEM resource for a sub device
 783 */
 784
 785 static void sm501_create_mem(struct sm501_devdata *sm,
 786                              struct resource *res,
 787                              resource_size_t *offs,
 788                              resource_size_t size)
 789 {
 790         *offs -= size;          /* adjust memory size */
 791
 792         res->flags = IORESOURCE_MEM;
 793         res->parent = sm->mem_res;
 794         res->start = sm->mem_res->start + *offs;
 795         res->end = res->start + size - 1;
 796 }
 797
 798 /* sm501_create_irq
 799  *
 800  * Fill in an IRQ resource for a sub device
 801 */
 802
 803 static void sm501_create_irq(struct sm501_devdata *sm,
 804                              struct resource *res)
 805 {
 806         res->flags = IORESOURCE_IRQ;
 807         res->parent = NULL;
 808         res->start = res->end = sm->irq;
 809 }
 810
 811 static int sm501_register_usbhost(struct sm501_devdata *sm,
 812                                   resource_size_t *mem_avail)
 813 {
 814         struct platform_device *pdev;
 815
 816         pdev = sm501_create_subdev(sm, "sm501-usb", 3, 0);
 817         if (!pdev)
 818                 return -ENOMEM;
 819
 820         sm501_create_subio(sm, &pdev->resource[0], 0x40000, 0x20000);
 821         sm501_create_mem(sm, &pdev->resource[1], mem_avail, 256*1024);
 822         sm501_create_irq(sm, &pdev->resource[2]);
 823
 824         return sm501_register_device(sm, pdev);
 825 }
 826
 827 static void sm501_setup_uart_data(struct sm501_devdata *sm,
 828                                   struct plat_serial8250_port *uart_data,
 829                                   unsigned int offset)
 830 {
 831         uart_data->membase = sm->regs + offset;
 832         uart_data->mapbase = sm->io_res->start + offset;
 833         uart_data->iotype = UPIO_MEM;
 834         uart_data->irq = sm->irq;
 835         uart_data->flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ;
 836         uart_data->regshift = 2;
 837         uart_data->uartclk = (9600 * 16);
 838 }
 839
 840 static int sm501_register_uart(struct sm501_devdata *sm, int devices)
 841 {
 842         struct platform_device *pdev;
 843         struct plat_serial8250_port *uart_data;
 844
 845         pdev = sm501_create_subdev(sm, "serial8250", 0,
 846                                    sizeof(struct plat_serial8250_port) * 3);
 847         if (!pdev)
 848                 return -ENOMEM;
 849
 850         uart_data = pdev->dev.platform_data;
 851
 852         if (devices & SM501_USE_UART0) {
 853                 sm501_setup_uart_data(sm, uart_data++, 0x30000);
 854                 sm501_unit_power(sm->dev, SM501_GATE_UART0, 1);
 855                 sm501_modify_reg(sm->dev, SM501_IRQ_MASK, 1 << 12, 0);
 856                 sm501_modify_reg(sm->dev, SM501_GPIO63_32_CONTROL, 0x01e0, 0);
 857         }
 858         if (devices & SM501_USE_UART1) {
 859                 sm501_setup_uart_data(sm, uart_data++, 0x30020);
 860                 sm501_unit_power(sm->dev, SM501_GATE_UART1, 1);
 861                 sm501_modify_reg(sm->dev, SM501_IRQ_MASK, 1 << 13, 0);
 862                 sm501_modify_reg(sm->dev, SM501_GPIO63_32_CONTROL, 0x1e00, 0);
 863         }
 864
 865         pdev->id = PLAT8250_DEV_SM501;
 866
 867         return sm501_register_device(sm, pdev);
 868 }
 869
 870 static int sm501_register_display(struct sm501_devdata *sm,
 871                                   resource_size_t *mem_avail)
 872 {
 873         struct platform_device *pdev;
 874
 875         pdev = sm501_create_subdev(sm, "sm501-fb", 4, 0);
 876         if (!pdev)
 877                 return -ENOMEM;
 878
 879         sm501_create_subio(sm, &pdev->resource[0], 0x80000, 0x10000);
 880         sm501_create_subio(sm, &pdev->resource[1], 0x100000, 0x50000);
 881         sm501_create_mem(sm, &pdev->resource[2], mem_avail, *mem_avail);
 882         sm501_create_irq(sm, &pdev->resource[3]);
 883
 884         return sm501_register_device(sm, pdev);
 885 }
 886
 887 #ifdef CONFIG_MFD_SM501_GPIO
 888
 889 static inline struct sm501_gpio_chip *to_sm501_gpio(struct gpio_chip *gc)
 890 {
 891         return container_of(gc, struct sm501_gpio_chip, gpio);
 892 }
 893
 894 static inline struct sm501_devdata *sm501_gpio_to_dev(struct sm501_gpio *gpio)
 895 {
 896         return container_of(gpio, struct sm501_devdata, gpio);
 897 }
 898
 899 static int sm501_gpio_get(struct gpio_chip *chip, unsigned offset)
 900
 901 {
 902         struct sm501_gpio_chip *smgpio = to_sm501_gpio(chip);
 903         unsigned long result;
 904
 905         result = readl(smgpio->regbase + SM501_GPIO_DATA_LOW);
 906         result >>= offset;
 907
 908         return result & 1UL;
 909 }
 910
 911 static void sm501_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 912
 913 {
 914         struct sm501_gpio_chip *smchip = to_sm501_gpio(chip);
 915         struct sm501_gpio *smgpio = smchip->ourgpio;
 916         unsigned long bit = 1 << offset;
 917         void __iomem *regs = smchip->regbase;
 918         unsigned long save;
 919         unsigned long val;
 920
 921         dev_dbg(sm501_gpio_to_dev(smgpio)->dev, "%s(%p,%d)\n",
 922                 __func__, chip, offset);
 923
 924         spin_lock_irqsave(&smgpio->lock, save);
 925
 926         val = readl(regs + SM501_GPIO_DATA_LOW) & ~bit;
 927         if (value)
 928                 val |= bit;
 929         writel(val, regs);
 930
 931         sm501_sync_regs(sm501_gpio_to_dev(smgpio));
 932         spin_unlock_irqrestore(&smgpio->lock, save);
 933 }
 934
 935 static int sm501_gpio_input(struct gpio_chip *chip, unsigned offset)
 936 {
 937         struct sm501_gpio_chip *smchip = to_sm501_gpio(chip);
 938         struct sm501_gpio *smgpio = smchip->ourgpio;
 939         void __iomem *regs = smchip->regbase;
 940         unsigned long bit = 1 << offset;
 941         unsigned long save;
 942         unsigned long ddr;
 943
 944         dev_info(sm501_gpio_to_dev(smgpio)->dev, "%s(%p,%d)\n",
 945                  __func__, chip, offset);
 946
 947         spin_lock_irqsave(&smgpio->lock, save);
 948
 949         ddr = readl(regs + SM501_GPIO_DDR_LOW);
 950         writel(ddr & ~bit, regs + SM501_GPIO_DDR_LOW);
 951
 952         sm501_sync_regs(sm501_gpio_to_dev(smgpio));
 953         spin_unlock_irqrestore(&smgpio->lock, save);
 954
 955         return 0;
 956 }
 957
 958 static int sm501_gpio_output(struct gpio_chip *chip,
 959                              unsigned offset, int value)
 960 {
 961         struct sm501_gpio_chip *smchip = to_sm501_gpio(chip);
 962         struct sm501_gpio *smgpio = smchip->ourgpio;
 963         unsigned long bit = 1 << offset;
 964         void __iomem *regs = smchip->regbase;
 965         unsigned long save;
 966         unsigned long val;
 967         unsigned long ddr;
 968
 969         dev_dbg(sm501_gpio_to_dev(smgpio)->dev, "%s(%p,%d,%d)\n",
 970                 __func__, chip, offset, value);
 971
 972         spin_lock_irqsave(&smgpio->lock, save);
 973
 974         val = readl(regs + SM501_GPIO_DATA_LOW);
 975         if (value)
 976                 val |= bit;
 977         else
 978                 val &= ~bit;
 979         writel(val, regs);
 980
 981         ddr = readl(regs + SM501_GPIO_DDR_LOW);
 982         writel(ddr | bit, regs + SM501_GPIO_DDR_LOW);
 983
 984         sm501_sync_regs(sm501_gpio_to_dev(smgpio));
 985         writel(val, regs + SM501_GPIO_DATA_LOW);
 986
 987         sm501_sync_regs(sm501_gpio_to_dev(smgpio));
 988         spin_unlock_irqrestore(&smgpio->lock, save);
 989
 990         return 0;
 991 }
 992
 993 static struct gpio_chip gpio_chip_template = {
 994         .ngpio                  = 32,
 995         .direction_input        = sm501_gpio_input,
 996         .direction_output       = sm501_gpio_output,
 997         .set                    = sm501_gpio_set,
 998         .get                    = sm501_gpio_get,
 999 };
1000
1001 static int __devinit sm501_gpio_register_chip(struct sm501_devdata *sm,
1002                                               struct sm501_gpio *gpio,
1003                                               struct sm501_gpio_chip *chip)
1004 {
1005         struct sm501_platdata *pdata = sm->platdata;
1006         struct gpio_chip *gchip = &chip->gpio;
1007         int base = pdata->gpio_base;
1008
1009         chip->gpio = gpio_chip_template;
1010
1011         if (chip == &gpio->high) {
1012                 if (base > 0)
1013                         base += 32;
1014                 chip->regbase = gpio->regs + SM501_GPIO_DATA_HIGH;
1015                 gchip->label  = "SM501-HIGH";
1016         } else {
1017                 chip->regbase = gpio->regs + SM501_GPIO_DATA_LOW;
1018                 gchip->label  = "SM501-LOW";
1019         }
1020
1021         gchip->base   = base;
1022         chip->ourgpio = gpio;
1023
1024         return gpiochip_add(gchip);
1025 }
1026
1027 static int sm501_register_gpio(struct sm501_devdata *sm)
1028 {
1029         struct sm501_gpio *gpio = &sm->gpio;
1030         resource_size_t iobase = sm->io_res->start + SM501_GPIO;
1031         int ret;
1032         int tmp;
1033
1034         dev_dbg(sm->dev, "registering gpio block %08llx\n",
1035                 (unsigned long long)iobase);
1036
1037         spin_lock_init(&gpio->lock);
1038
1039         gpio->regs_res = request_mem_region(iobase, 0x20, "sm501-gpio");
1040         if (gpio->regs_res == NULL) {
1041                 dev_err(sm->dev, "gpio: failed to request region\n");
1042                 return -ENXIO;
1043         }
1044
1045         gpio->regs = ioremap(iobase, 0x20);
1046         if (gpio->regs == NULL) {
1047                 dev_err(sm->dev, "gpio: failed to remap registers\n");
1048                 ret = -ENXIO;
1049                 goto err_claimed;
1050         }
1051
1052         /* Register both our chips. */
1053
1054         ret = sm501_gpio_register_chip(sm, gpio, &gpio->low);
1055         if (ret) {
1056                 dev_err(sm->dev, "failed to add low chip\n");
1057                 goto err_mapped;
1058         }
1059
1060         ret = sm501_gpio_register_chip(sm, gpio, &gpio->high);
1061         if (ret) {
1062                 dev_err(sm->dev, "failed to add high chip\n");
1063                 goto err_low_chip;
1064         }
1065
1066         gpio->registered = 1;
1067
1068         return 0;
1069
1070  err_low_chip:
1071         tmp = gpiochip_remove(&gpio->low.gpio);
1072         if (tmp) {
1073                 dev_err(sm->dev, "cannot remove low chip, cannot tidy up\n");
1074                 return ret;
1075         }
1076
1077  err_mapped:
1078         iounmap(gpio->regs);
1079
1080  err_claimed:
1081         release_resource(gpio->regs_res);
1082         kfree(gpio->regs_res);
1083
1084         return ret;
1085 }
1086
1087 static void sm501_gpio_remove(struct sm501_devdata *sm)
1088 {
1089         struct sm501_gpio *gpio = &sm->gpio;
1090         int ret;
1091
1092         if (!sm->gpio.registered)
1093                 return;
1094
1095         ret = gpiochip_remove(&gpio->low.gpio);
1096         if (ret)
1097                 dev_err(sm->dev, "cannot remove low chip, cannot tidy up\n");
1098
1099         ret = gpiochip_remove(&gpio->high.gpio);
1100         if (ret)
1101                 dev_err(sm->dev, "cannot remove high chip, cannot tidy up\n");
1102
1103         iounmap(gpio->regs);
1104         release_resource(gpio->regs_res);
1105         kfree(gpio->regs_res);
1106 }
1107
1108 static inline int sm501_gpio_pin2nr(struct sm501_devdata *sm, unsigned int pin)
1109 {
1110         struct sm501_gpio *gpio = &sm->gpio;
1111         int base = (pin < 32) ? gpio->low.gpio.base : gpio->high.gpio.base;
1112
1113         return (pin % 32) + base;
1114 }
1115
1116 static inline int sm501_gpio_isregistered(struct sm501_devdata *sm)
1117 {
1118         return sm->gpio.registered;
1119 }
1120 #else
1121 static inline int sm501_register_gpio(struct sm501_devdata *sm)
1122 {
1123         return 0;
1124 }
1125
1126 static inline void sm501_gpio_remove(struct sm501_devdata *sm)
1127 {
1128 }
1129
1130 static inline int sm501_gpio_pin2nr(struct sm501_devdata *sm, unsigned int pin)
1131 {
1132         return -1;
1133 }
1134
1135 static inline int sm501_gpio_isregistered(struct sm501_devdata *sm)
1136 {
1137         return 0;
1138 }
1139 #endif
1140
1141 static int sm501_register_gpio_i2c_instance(struct sm501_devdata *sm,
1142                                             struct sm501_platdata_gpio_i2c *iic)
1143 {
1144         struct i2c_gpio_platform_data *icd;
1145         struct platform_device *pdev;
1146
1147         pdev = sm501_create_subdev(sm, "i2c-gpio", 0,
1148                                    sizeof(struct i2c_gpio_platform_data));
1149         if (!pdev)
1150                 return -ENOMEM;
1151
1152         icd = pdev->dev.platform_data;
1153
1154         /* We keep the pin_sda and pin_scl fields relative in case the
1155          * same platform data is passed to >1 SM501.
1156          */
1157
1158         icd->sda_pin = sm501_gpio_pin2nr(sm, iic->pin_sda);
1159         icd->scl_pin = sm501_gpio_pin2nr(sm, iic->pin_scl);
1160         icd->timeout = iic->timeout;
1161         icd->udelay = iic->udelay;
1162
1163         /* note, we can't use either of the pin numbers, as the i2c-gpio
1164          * driver uses the platform.id field to generate the bus number
1165          * to register with the i2c core; The i2c core doesn't have enough
1166          * entries to deal with anything we currently use.
1167         */
1168
1169         pdev->id = iic->bus_num;
1170
1171         dev_info(sm->dev, "registering i2c-%d: sda=%d (%d), scl=%d (%d)\n",
1172                  iic->bus_num,
1173                  icd->sda_pin, iic->pin_sda, icd->scl_pin, iic->pin_scl);
1174
1175         return sm501_register_device(sm, pdev);
1176 }
1177
1178 static int sm501_register_gpio_i2c(struct sm501_devdata *sm,
1179                                    struct sm501_platdata *pdata)
1180 {
1181         struct sm501_platdata_gpio_i2c *iic = pdata->gpio_i2c;
1182         int index;
1183         int ret;
1184
1185         for (index = 0; index < pdata->gpio_i2c_nr; index++, iic++) {
1186                 ret = sm501_register_gpio_i2c_instance(sm, iic);
1187                 if (ret < 0)
1188                         return ret;
1189         }
1190
1191         return 0;
1192 }
1193
1194 /* sm501_dbg_regs
1195  *
1196  * Debug attribute to attach to parent device to show core registers
1197 */
1198
1199 static ssize_t sm501_dbg_regs(struct device *dev,
1200                               struct device_attribute *attr, char *buff)
1201 {
1202         struct sm501_devdata *sm = dev_get_drvdata(dev) ;
1203         unsigned int reg;
1204         char *ptr = buff;
1205         int ret;
1206
1207         for (reg = 0x00; reg < 0x70; reg += 4) {
1208                 ret = sprintf(ptr, "%08x = %08x\n",
1209                               reg, readl(sm->regs + reg));
1210                 ptr += ret;
1211         }
1212
1213         return ptr - buff;
1214 }
1215
1216
1217 static DEVICE_ATTR(dbg_regs, 0666, sm501_dbg_regs, NULL);
1218
1219 /* sm501_init_reg
1220  *
1221  * Helper function for the init code to setup a register
1222  *
1223  * clear the bits which are set in r->mask, and then set
1224  * the bits set in r->set.
1225 */
1226
1227 static inline void sm501_init_reg(struct sm501_devdata *sm,
1228                                   unsigned long reg,
1229                                   struct sm501_reg_init *r)
1230 {
1231         unsigned long tmp;
1232
1233         tmp = readl(sm->regs + reg);
1234         tmp &= ~r->mask;
1235         tmp |= r->set;
1236         writel(tmp, sm->regs + reg);
1237 }
1238
1239 /* sm501_init_regs
1240  *
1241  * Setup core register values
1242 */
1243
1244 static void sm501_init_regs(struct sm501_devdata *sm,
1245                             struct sm501_initdata *init)
1246 {
1247         sm501_misc_control(sm->dev,
1248                            init->misc_control.set,
1249                            init->misc_control.mask);
1250
1251         sm501_init_reg(sm, SM501_MISC_TIMING, &init->misc_timing);
1252         sm501_init_reg(sm, SM501_GPIO31_0_CONTROL, &init->gpio_low);
1253         sm501_init_reg(sm, SM501_GPIO63_32_CONTROL, &init->gpio_high);
1254
1255         if (init->m1xclk) {
1256                 dev_info(sm->dev, "setting M1XCLK to %ld\n", init->m1xclk);
1257                 sm501_set_clock(sm->dev, SM501_CLOCK_M1XCLK, init->m1xclk);
1258         }
1259
1260         if (init->mclk) {
1261                 dev_info(sm->dev, "setting MCLK to %ld\n", init->mclk);
1262                 sm501_set_clock(sm->dev, SM501_CLOCK_MCLK, init->mclk);
1263         }
1264
1265 }
1266
1267 /* Check the PLL sources for the M1CLK and M1XCLK
1268  *
1269  * If the M1CLK and M1XCLKs are not sourced from the same PLL, then
1270  * there is a risk (see errata AB-5) that the SM501 will cease proper
1271  * function. If this happens, then it is likely the SM501 will
1272  * hang the system.
1273 */
1274
1275 static int sm501_check_clocks(struct sm501_devdata *sm)
1276 {
1277         unsigned long pwrmode = readl(sm->regs + SM501_CURRENT_CLOCK);
1278         unsigned long msrc = (pwrmode & SM501_POWERMODE_M_SRC);
1279         unsigned long m1src = (pwrmode & SM501_POWERMODE_M1_SRC);
1280
1281         return ((msrc == 0 && m1src != 0) || (msrc != 0 && m1src == 0));
1282 }
1283
1284 static unsigned int sm501_mem_local[] = {
1285         [0]     = 4*1024*1024,
1286         [1]     = 8*1024*1024,
1287         [2]     = 16*1024*1024,
1288         [3]     = 32*1024*1024,
1289         [4]     = 64*1024*1024,
1290         [5]     = 2*1024*1024,
1291 };
1292
1293 /* sm501_init_dev
1294  *
1295  * Common init code for an SM501
1296 */
1297
1298 static int sm501_init_dev(struct sm501_devdata *sm)
1299 {
1300         struct sm501_initdata *idata;
1301         struct sm501_platdata *pdata;
1302         resource_size_t mem_avail;
1303         unsigned long dramctrl;
1304         unsigned long devid;
1305         int ret;
1306
1307         mutex_init(&sm->clock_lock);
1308         spin_lock_init(&sm->reg_lock);
1309
1310         INIT_LIST_HEAD(&sm->devices);
1311
1312         devid = readl(sm->regs + SM501_DEVICEID);
1313
1314         if ((devid & SM501_DEVICEID_IDMASK) != SM501_DEVICEID_SM501) {
1315                 dev_err(sm->dev, "incorrect device id %08lx\n", devid);
1316                 return -EINVAL;
1317         }
1318
1319         /* disable irqs */
1320         writel(0, sm->regs + SM501_IRQ_MASK);
1321
1322         dramctrl = readl(sm->regs + SM501_DRAM_CONTROL);
1323         mem_avail = sm501_mem_local[(dramctrl >> 13) & 0x7];
1324
1325         dev_info(sm->dev, "SM501 At %p: Version %08lx, %ld Mb, IRQ %d\n",
1326                  sm->regs, devid, (unsigned long)mem_avail >> 20, sm->irq);
1327
1328         sm->rev = devid & SM501_DEVICEID_REVMASK;
1329
1330         sm501_dump_gate(sm);
1331
1332         ret = device_create_file(sm->dev, &dev_attr_dbg_regs);
1333         if (ret)
1334                 dev_err(sm->dev, "failed to create debug regs file\n");
1335
1336         sm501_dump_clk(sm);
1337
1338         /* check to see if we have some device initialisation */
1339
1340         pdata = sm->platdata;
1341         idata = pdata ? pdata->init : NULL;
1342
1343         if (idata) {
1344                 sm501_init_regs(sm, idata);
1345
1346                 if (idata->devices & SM501_USE_USB_HOST)
1347                         sm501_register_usbhost(sm, &mem_avail);
1348                 if (idata->devices & (SM501_USE_UART0 | SM501_USE_UART1))
1349                         sm501_register_uart(sm, idata->devices);
1350                 if (idata->devices & SM501_USE_GPIO)
1351                         sm501_register_gpio(sm);
1352         }
1353
1354         if (pdata->gpio_i2c != NULL && pdata->gpio_i2c_nr > 0) {
1355                 if (!sm501_gpio_isregistered(sm))
1356                         dev_err(sm->dev, "no gpio available for i2c gpio.\n");
1357                 else
1358                         sm501_register_gpio_i2c(sm, pdata);
1359         }
1360
1361         ret = sm501_check_clocks(sm);
1362         if (ret) {
1363                 dev_err(sm->dev, "M1X and M clocks sourced from different "
1364                                         "PLLs\n");
1365                 return -EINVAL;
1366         }
1367
1368         /* always create a framebuffer */
1369         sm501_register_display(sm, &mem_avail);
1370
1371         return 0;
1372 }
1373
1374 static int sm501_plat_probe(struct platform_device *dev)
1375 {
1376         struct sm501_devdata *sm;
1377         int err;
1378
1379         sm = kzalloc(sizeof(struct sm501_devdata), GFP_KERNEL);
1380         if (sm == NULL) {
1381                 dev_err(&dev->dev, "no memory for device data\n");
1382                 err = -ENOMEM;
1383                 goto err1;
1384         }
1385
1386         sm->dev = &dev->dev;
1387         sm->pdev_id = dev->id;
1388         sm->irq = platform_get_irq(dev, 0);
1389         sm->io_res = platform_get_resource(dev, IORESOURCE_MEM, 1);
1390         sm->mem_res = platform_get_resource(dev, IORESOURCE_MEM, 0);
1391         sm->platdata = dev->dev.platform_data;
1392
1393         if (sm->irq < 0) {
1394                 dev_err(&dev->dev, "failed to get irq resource\n");
1395                 err = sm->irq;
1396                 goto err_res;
1397         }
1398
1399         if (sm->io_res == NULL || sm->mem_res == NULL) {
1400                 dev_err(&dev->dev, "failed to get IO resource\n");
1401                 err = -ENOENT;
1402                 goto err_res;
1403         }
1404
1405         sm->regs_claim = request_mem_region(sm->io_res->start,
1406                                             0x100, "sm501");
1407
1408         if (sm->regs_claim == NULL) {
1409                 dev_err(&dev->dev, "cannot claim registers\n");
1410                 err= -EBUSY;
1411                 goto err_res;
1412         }
1413
1414         platform_set_drvdata(dev, sm);
1415
1416         sm->regs = ioremap(sm->io_res->start,
1417                            (sm->io_res->end - sm->io_res->start) - 1);
1418
1419         if (sm->regs == NULL) {
1420                 dev_err(&dev->dev, "cannot remap registers\n");
1421                 err = -EIO;
1422                 goto err_claim;
1423         }
1424
1425         return sm501_init_dev(sm);
1426
1427  err_claim:
1428         release_resource(sm->regs_claim);
1429         kfree(sm->regs_claim);
1430  err_res:
1431         kfree(sm);
1432  err1:
1433         return err;
1434
1435 }
1436
1437 #ifdef CONFIG_PM
1438
1439 /* power management support */
1440
1441 static void sm501_set_power(struct sm501_devdata *sm, int on)
1442 {
1443         struct sm501_platdata *pd = sm->platdata;
1444
1445         if (pd == NULL)
1446                 return;
1447
1448         if (pd->get_power) {
1449                 if (pd->get_power(sm->dev) == on) {
1450                         dev_dbg(sm->dev, "is already %d\n", on);
1451                         return;
1452                 }
1453         }
1454
1455         if (pd->set_power) {
1456                 dev_dbg(sm->dev, "setting power to %d\n", on);
1457
1458                 pd->set_power(sm->dev, on);
1459                 sm501_mdelay(sm, 10);
1460         }
1461 }
1462
1463 static int sm501_plat_suspend(struct platform_device *pdev, pm_message_t state)
1464 {
1465         struct sm501_devdata *sm = platform_get_drvdata(pdev);
1466
1467         sm->in_suspend = 1;
1468         sm->pm_misc = readl(sm->regs + SM501_MISC_CONTROL);
1469
1470         sm501_dump_regs(sm);
1471
1472         if (sm->platdata) {
1473                 if (sm->platdata->flags & SM501_FLAG_SUSPEND_OFF)
1474                         sm501_set_power(sm, 0);
1475         }
1476
1477         return 0;
1478 }
1479
1480 static int sm501_plat_resume(struct platform_device *pdev)
1481 {
1482         struct sm501_devdata *sm = platform_get_drvdata(pdev);
1483
1484         sm501_set_power(sm, 1);
1485
1486         sm501_dump_regs(sm);
1487         sm501_dump_gate(sm);
1488         sm501_dump_clk(sm);
1489
1490         /* check to see if we are in the same state as when suspended */
1491
1492         if (readl(sm->regs + SM501_MISC_CONTROL) != sm->pm_misc) {
1493                 dev_info(sm->dev, "SM501_MISC_CONTROL changed over sleep\n");
1494                 writel(sm->pm_misc, sm->regs + SM501_MISC_CONTROL);
1495
1496                 /* our suspend causes the controller state to change,
1497                  * either by something attempting setup, power loss,
1498                  * or an external reset event on power change */
1499
1500                 if (sm->platdata && sm->platdata->init) {
1501                         sm501_init_regs(sm, sm->platdata->init);
1502                 }
1503         }
1504
1505         /* dump our state from resume */
1506
1507         sm501_dump_regs(sm);
1508         sm501_dump_clk(sm);
1509
1510         sm->in_suspend = 0;
1511
1512         return 0;
1513 }
1514 #else
1515 #define sm501_plat_suspend NULL
1516 #define sm501_plat_resume NULL
1517 #endif
1518
1519 /* Initialisation data for PCI devices */
1520
1521 static struct sm501_initdata sm501_pci_initdata = {
1522         .gpio_high      = {
1523                 .set    = 0x3F000000,           /* 24bit panel */
1524                 .mask   = 0x0,
1525         },
1526         .misc_timing    = {
1527                 .set    = 0x010100,             /* SDRAM timing */
1528                 .mask   = 0x1F1F00,
1529         },
1530         .misc_control   = {
1531                 .set    = SM501_MISC_PNL_24BIT,
1532                 .mask   = 0,
1533         },
1534
1535         .devices        = SM501_USE_ALL,
1536
1537         /* Errata AB-3 says that 72MHz is the fastest available
1538          * for 33MHZ PCI with proper bus-mastering operation */
1539
1540         .mclk           = 72 * MHZ,
1541         .m1xclk         = 144 * MHZ,
1542 };
1543
1544 static struct sm501_platdata_fbsub sm501_pdata_fbsub = {
1545         .flags          = (SM501FB_FLAG_USE_INIT_MODE |
1546                            SM501FB_FLAG_USE_HWCURSOR |
1547                            SM501FB_FLAG_USE_HWACCEL |
1548                            SM501FB_FLAG_DISABLE_AT_EXIT),
1549 };
1550
1551 static struct sm501_platdata_fb sm501_fb_pdata = {
1552         .fb_route       = SM501_FB_OWN,
1553         .fb_crt         = &sm501_pdata_fbsub,
1554         .fb_pnl         = &sm501_pdata_fbsub,
1555 };
1556
1557 static struct sm501_platdata sm501_pci_platdata = {
1558         .init           = &sm501_pci_initdata,
1559         .fb             = &sm501_fb_pdata,
1560         .gpio_base      = -1,
1561 };
1562
1563 static int sm501_pci_probe(struct pci_dev *dev,
1564                            const struct pci_device_id *id)
1565 {
1566         struct sm501_devdata *sm;
1567         int err;
1568
1569         sm = kzalloc(sizeof(struct sm501_devdata), GFP_KERNEL);
1570         if (sm == NULL) {
1571                 dev_err(&dev->dev, "no memory for device data\n");
1572                 err = -ENOMEM;
1573                 goto err1;
1574         }
1575
1576         /* set a default set of platform data */
1577         dev->dev.platform_data = sm->platdata = &sm501_pci_platdata;
1578
1579         /* set a hopefully unique id for our child platform devices */
1580         sm->pdev_id = 32 + dev->devfn;
1581
1582         pci_set_drvdata(dev, sm);
1583
1584         err = pci_enable_device(dev);
1585         if (err) {
1586                 dev_err(&dev->dev, "cannot enable device\n");
1587                 goto err2;
1588         }
1589
1590         sm->dev = &dev->dev;
1591         sm->irq = dev->irq;
1592
1593 #ifdef __BIG_ENDIAN
1594         /* if the system is big-endian, we most probably have a
1595          * translation in the IO layer making the PCI bus little endian
1596          * so make the framebuffer swapped pixels */
1597
1598         sm501_fb_pdata.flags |= SM501_FBPD_SWAP_FB_ENDIAN;
1599 #endif
1600
1601         /* check our resources */
1602
1603         if (!(pci_resource_flags(dev, 0) & IORESOURCE_MEM)) {
1604                 dev_err(&dev->dev, "region #0 is not memory?\n");
1605                 err = -EINVAL;
1606                 goto err3;
1607         }
1608
1609         if (!(pci_resource_flags(dev, 1) & IORESOURCE_MEM)) {
1610                 dev_err(&dev->dev, "region #1 is not memory?\n");
1611                 err = -EINVAL;
1612                 goto err3;
1613         }
1614
1615         /* make our resources ready for sharing */
1616
1617         sm->io_res = &dev->resource[1];
1618         sm->mem_res = &dev->resource[0];
1619
1620         sm->regs_claim = request_mem_region(sm->io_res->start,
1621                                             0x100, "sm501");
1622         if (sm->regs_claim == NULL) {
1623                 dev_err(&dev->dev, "cannot claim registers\n");
1624                 err= -EBUSY;
1625                 goto err3;
1626         }
1627
1628         sm->regs = ioremap(pci_resource_start(dev, 1),
1629                            pci_resource_len(dev, 1));
1630
1631         if (sm->regs == NULL) {
1632                 dev_err(&dev->dev, "cannot remap registers\n");
1633                 err = -EIO;
1634                 goto err4;
1635         }
1636
1637         sm501_init_dev(sm);
1638         return 0;
1639
1640  err4:
1641         release_resource(sm->regs_claim);
1642         kfree(sm->regs_claim);
1643  err3:
1644         pci_disable_device(dev);
1645  err2:
1646         pci_set_drvdata(dev, NULL);
1647         kfree(sm);
1648  err1:
1649         return err;
1650 }
1651
1652 static void sm501_remove_sub(struct sm501_devdata *sm,
1653                              struct sm501_device *smdev)
1654 {
1655         list_del(&smdev->list);
1656         platform_device_unregister(&smdev->pdev);
1657 }
1658
1659 static void sm501_dev_remove(struct sm501_devdata *sm)
1660 {
1661         struct sm501_device *smdev, *tmp;
1662
1663         list_for_each_entry_safe(smdev, tmp, &sm->devices, list)
1664                 sm501_remove_sub(sm, smdev);
1665
1666         device_remove_file(sm->dev, &dev_attr_dbg_regs);
1667
1668         sm501_gpio_remove(sm);
1669 }
1670
1671 static void sm501_pci_remove(struct pci_dev *dev)
1672 {
1673         struct sm501_devdata *sm = pci_get_drvdata(dev);
1674
1675         sm501_dev_remove(sm);
1676         iounmap(sm->regs);
1677
1678         release_resource(sm->regs_claim);
1679         kfree(sm->regs_claim);
1680
1681         pci_set_drvdata(dev, NULL);
1682         pci_disable_device(dev);
1683 }
1684
1685 static int sm501_plat_remove(struct platform_device *dev)
1686 {
1687         struct sm501_devdata *sm = platform_get_drvdata(dev);
1688
1689         sm501_dev_remove(sm);
1690         iounmap(sm->regs);
1691
1692         release_resource(sm->regs_claim);
1693         kfree(sm->regs_claim);
1694
1695         return 0;
1696 }
1697
1698 static struct pci_device_id sm501_pci_tbl[] = {
1699         { 0x126f, 0x0501, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
1700         { 0, },
1701 };
1702
1703 MODULE_DEVICE_TABLE(pci, sm501_pci_tbl);
1704
1705 static struct pci_driver sm501_pci_drv = {
1706         .name           = "sm501",
1707         .id_table       = sm501_pci_tbl,
1708         .probe          = sm501_pci_probe,
1709         .remove         = sm501_pci_remove,
1710 };
1711
1712 MODULE_ALIAS("platform:sm501");
1713
1714 static struct platform_driver sm501_plat_drv = {
1715         .driver         = {
1716                 .name   = "sm501",
1717                 .owner  = THIS_MODULE,
1718         },
1719         .probe          = sm501_plat_probe,
1720         .remove         = sm501_plat_remove,
1721         .suspend        = sm501_plat_suspend,
1722         .resume         = sm501_plat_resume,
1723 };
1724
1725 static int __init sm501_base_init(void)
1726 {
1727         platform_driver_register(&sm501_plat_drv);
1728         return pci_register_driver(&sm501_pci_drv);
1729 }
1730
1731 static void __exit sm501_base_exit(void)
1732 {
1733         platform_driver_unregister(&sm501_plat_drv);
1734         pci_unregister_driver(&sm501_pci_drv);
1735 }
1736
1737 module_init(sm501_base_init);
1738 module_exit(sm501_base_exit);
1739
1740 MODULE_DESCRIPTION("SM501 Core Driver");
1741 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>, Vincent Sanders");
1742 MODULE_LICENSE("GPL v2");