drivers/mfd/sm501.c

   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 #include <linux/slab.h>
  24
  25 #include <linux/sm501.h>
  26 #include <linux/sm501-regs.h>
  27 #include <linux/serial_8250.h>
  28
  29 #include <linux/io.h>
  30
  31 struct sm501_device {
  32         struct list_head                list;
  33         struct platform_device          pdev;
  34 };
  35
  36 struct sm501_gpio;
  37
  38 #ifdef CONFIG_MFD_SM501_GPIO
  39 #include <linux/gpio.h>
  40
  41 struct sm501_gpio_chip {
  42         struct gpio_chip        gpio;
  43         struct sm501_gpio       *ourgpio;       /* to get back to parent. */
  44         void __iomem            *regbase;
  45         void __iomem            *control;       /* address of control reg. */
  46 };
  47
  48 struct sm501_gpio {
  49         struct sm501_gpio_chip  low;
  50         struct sm501_gpio_chip  high;
  51         spinlock_t              lock;
  52
  53         unsigned int             registered : 1;
  54         void __iomem            *regs;
  55         struct resource         *regs_res;
  56 };
  57 #else
  58 struct sm501_gpio {
  59         /* no gpio support, empty definition for sm501_devdata. */
  60 };
  61 #endif
  62
  63 struct sm501_devdata {
  64         spinlock_t                       reg_lock;
  65         struct mutex                     clock_lock;
  66         struct list_head                 devices;
  67         struct sm501_gpio                gpio;
  68
  69         struct device                   *dev;
  70         struct resource                 *io_res;
  71         struct resource                 *mem_res;
  72         struct resource                 *regs_claim;
  73         struct sm501_platdata           *platdata;
  74
  75
  76         unsigned int                     in_suspend;
  77         unsigned long                    pm_misc;
  78
  79         int                              unit_power[20];
  80         unsigned int                     pdev_id;
  81         unsigned int                     irq;
  82         void __iomem                    *regs;
  83         unsigned int                     rev;
  84 };
  85
  86
  87 #define MHZ (1000 * 1000)
  88
  89 #ifdef DEBUG
  90 static const unsigned int div_tab[] = {
  91         [0]             = 1,
  92         [1]             = 2,
  93         [2]             = 4,
  94         [3]             = 8,
  95         [4]             = 16,
  96         [5]             = 32,
  97         [6]             = 64,
  98         [7]             = 128,
  99         [8]             = 3,
 100         [9]             = 6,
 101         [10]            = 12,
 102         [11]            = 24,
 103         [12]            = 48,
 104         [13]            = 96,
 105         [14]            = 192,
 106         [15]            = 384,
 107         [16]            = 5,
 108         [17]            = 10,
 109         [18]            = 20,
 110         [19]            = 40,
 111         [20]            = 80,
 112         [21]            = 160,
 113         [22]            = 320,
 114         [23]            = 604,
 115 };
 116
 117 static unsigned long decode_div(unsigned long pll2, unsigned long val,
 118                                 unsigned int lshft, unsigned int selbit,
 119                                 unsigned long mask)
 120 {
 121         if (val & selbit)
 122                 pll2 = 288 * MHZ;
 123
 124         return pll2 / div_tab[(val >> lshft) & mask];
 125 }
 126
 127 #define fmt_freq(x) ((x) / MHZ), ((x) % MHZ), (x)
 128
 129 /* sm501_dump_clk
 130  *
 131  * Print out the current clock configuration for the device
 132 */
 133
 134 static void sm501_dump_clk(struct sm501_devdata *sm)
 135 {
 136         unsigned long misct = smc501_readl(sm->regs + SM501_MISC_TIMING);
 137         unsigned long pm0 = smc501_readl(sm->regs + SM501_POWER_MODE_0_CLOCK);
 138         unsigned long pm1 = smc501_readl(sm->regs + SM501_POWER_MODE_1_CLOCK);
 139         unsigned long pmc = smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL);
 140         unsigned long sdclk0, sdclk1;
 141         unsigned long pll2 = 0;
 142
 143         switch (misct & 0x30) {
 144         case 0x00:
 145                 pll2 = 336 * MHZ;
 146                 break;
 147         case 0x10:
 148                 pll2 = 288 * MHZ;
 149                 break;
 150         case 0x20:
 151                 pll2 = 240 * MHZ;
 152                 break;
 153         case 0x30:
 154                 pll2 = 192 * MHZ;
 155                 break;
 156         }
 157
 158         sdclk0 = (misct & (1<<12)) ? pll2 : 288 * MHZ;
 159         sdclk0 /= div_tab[((misct >> 8) & 0xf)];
 160
 161         sdclk1 = (misct & (1<<20)) ? pll2 : 288 * MHZ;
 162         sdclk1 /= div_tab[((misct >> 16) & 0xf)];
 163
 164         dev_dbg(sm->dev, "MISCT=%08lx, PM0=%08lx, PM1=%08lx\n",
 165                 misct, pm0, pm1);
 166
 167         dev_dbg(sm->dev, "PLL2 = %ld.%ld MHz (%ld), SDCLK0=%08lx, SDCLK1=%08lx\n",
 168                 fmt_freq(pll2), sdclk0, sdclk1);
 169
 170         dev_dbg(sm->dev, "SDRAM: PM0=%ld, PM1=%ld\n", sdclk0, sdclk1);
 171
 172         dev_dbg(sm->dev, "PM0[%c]: "
 173                  "P2 %ld.%ld MHz (%ld), V2 %ld.%ld (%ld), "
 174                  "M %ld.%ld (%ld), MX1 %ld.%ld (%ld)\n",
 175                  (pmc & 3 ) == 0 ? '*' : '-',
 176                  fmt_freq(decode_div(pll2, pm0, 24, 1<<29, 31)),
 177                  fmt_freq(decode_div(pll2, pm0, 16, 1<<20, 15)),
 178                  fmt_freq(decode_div(pll2, pm0, 8,  1<<12, 15)),
 179                  fmt_freq(decode_div(pll2, pm0, 0,  1<<4,  15)));
 180
 181         dev_dbg(sm->dev, "PM1[%c]: "
 182                 "P2 %ld.%ld MHz (%ld), V2 %ld.%ld (%ld), "
 183                 "M %ld.%ld (%ld), MX1 %ld.%ld (%ld)\n",
 184                 (pmc & 3 ) == 1 ? '*' : '-',
 185                 fmt_freq(decode_div(pll2, pm1, 24, 1<<29, 31)),
 186                 fmt_freq(decode_div(pll2, pm1, 16, 1<<20, 15)),
 187                 fmt_freq(decode_div(pll2, pm1, 8,  1<<12, 15)),
 188                 fmt_freq(decode_div(pll2, pm1, 0,  1<<4,  15)));
 189 }
 190
 191 static void sm501_dump_regs(struct sm501_devdata *sm)
 192 {
 193         void __iomem *regs = sm->regs;
 194
 195         dev_info(sm->dev, "System Control   %08x\n",
 196                         smc501_readl(regs + SM501_SYSTEM_CONTROL));
 197         dev_info(sm->dev, "Misc Control     %08x\n",
 198                         smc501_readl(regs + SM501_MISC_CONTROL));
 199         dev_info(sm->dev, "GPIO Control Low %08x\n",
 200                         smc501_readl(regs + SM501_GPIO31_0_CONTROL));
 201         dev_info(sm->dev, "GPIO Control Hi  %08x\n",
 202                         smc501_readl(regs + SM501_GPIO63_32_CONTROL));
 203         dev_info(sm->dev, "DRAM Control     %08x\n",
 204                         smc501_readl(regs + SM501_DRAM_CONTROL));
 205         dev_info(sm->dev, "Arbitration Ctrl %08x\n",
 206                         smc501_readl(regs + SM501_ARBTRTN_CONTROL));
 207         dev_info(sm->dev, "Misc Timing      %08x\n",
 208                         smc501_readl(regs + SM501_MISC_TIMING));
 209 }
 210
 211 static void sm501_dump_gate(struct sm501_devdata *sm)
 212 {
 213         dev_info(sm->dev, "CurrentGate      %08x\n",
 214                         smc501_readl(sm->regs + SM501_CURRENT_GATE));
 215         dev_info(sm->dev, "CurrentClock     %08x\n",
 216                         smc501_readl(sm->regs + SM501_CURRENT_CLOCK));
 217         dev_info(sm->dev, "PowerModeControl %08x\n",
 218                         smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL));
 219 }
 220
 221 #else
 222 static inline void sm501_dump_gate(struct sm501_devdata *sm) { }
 223 static inline void sm501_dump_regs(struct sm501_devdata *sm) { }
 224 static inline void sm501_dump_clk(struct sm501_devdata *sm) { }
 225 #endif
 226
 227 /* sm501_sync_regs
 228  *
 229  * ensure the
 230 */
 231
 232 static void sm501_sync_regs(struct sm501_devdata *sm)
 233 {
 234         smc501_readl(sm->regs);
 235 }
 236
 237 static inline void sm501_mdelay(struct sm501_devdata *sm, unsigned int delay)
 238 {
 239         /* during suspend/resume, we are currently not allowed to sleep,
 240          * so change to using mdelay() instead of msleep() if we
 241          * are in one of these paths */
 242
 243         if (sm->in_suspend)
 244                 mdelay(delay);
 245         else
 246                 msleep(delay);
 247 }
 248
 249 /* sm501_misc_control
 250  *
 251  * alters the miscellaneous control parameters
 252 */
 253
 254 int sm501_misc_control(struct device *dev,
 255                        unsigned long set, unsigned long clear)
 256 {
 257         struct sm501_devdata *sm = dev_get_drvdata(dev);
 258         unsigned long misc;
 259         unsigned long save;
 260         unsigned long to;
 261
 262         spin_lock_irqsave(&sm->reg_lock, save);
 263
 264         misc = smc501_readl(sm->regs + SM501_MISC_CONTROL);
 265         to = (misc & ~clear) | set;
 266
 267         if (to != misc) {
 268                 smc501_writel(to, sm->regs + SM501_MISC_CONTROL);
 269                 sm501_sync_regs(sm);
 270
 271                 dev_dbg(sm->dev, "MISC_CONTROL %08lx\n", misc);
 272         }
 273
 274         spin_unlock_irqrestore(&sm->reg_lock, save);
 275         return to;
 276 }
 277
 278 EXPORT_SYMBOL_GPL(sm501_misc_control);
 279
 280 /* sm501_modify_reg
 281  *
 282  * Modify a register in the SM501 which may be shared with other
 283  * drivers.
 284 */
 285
 286 unsigned long sm501_modify_reg(struct device *dev,
 287                                unsigned long reg,
 288                                unsigned long set,
 289                                unsigned long clear)
 290 {
 291         struct sm501_devdata *sm = dev_get_drvdata(dev);
 292         unsigned long data;
 293         unsigned long save;
 294
 295         spin_lock_irqsave(&sm->reg_lock, save);
 296
 297         data = smc501_readl(sm->regs + reg);
 298         data |= set;
 299         data &= ~clear;
 300
 301         smc501_writel(data, sm->regs + reg);
 302         sm501_sync_regs(sm);
 303
 304         spin_unlock_irqrestore(&sm->reg_lock, save);
 305
 306         return data;
 307 }
 308
 309 EXPORT_SYMBOL_GPL(sm501_modify_reg);
 310
 311 /* sm501_unit_power
 312  *
 313  * alters the power active gate to set specific units on or off
 314  */
 315
 316 int sm501_unit_power(struct device *dev, unsigned int unit, unsigned int to)
 317 {
 318         struct sm501_devdata *sm = dev_get_drvdata(dev);
 319         unsigned long mode;
 320         unsigned long gate;
 321         unsigned long clock;
 322
 323         mutex_lock(&sm->clock_lock);
 324
 325         mode = smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL);
 326         gate = smc501_readl(sm->regs + SM501_CURRENT_GATE);
 327         clock = smc501_readl(sm->regs + SM501_CURRENT_CLOCK);
 328
 329         mode &= 3;              /* get current power mode */
 330
 331         if (unit >= ARRAY_SIZE(sm->unit_power)) {
 332                 dev_err(dev, "%s: bad unit %d\n", __func__, unit);
 333                 goto already;
 334         }
 335
 336         dev_dbg(sm->dev, "%s: unit %d, cur %d, to %d\n", __func__, unit,
 337                 sm->unit_power[unit], to);
 338
 339         if (to == 0 && sm->unit_power[unit] == 0) {
 340                 dev_err(sm->dev, "unit %d is already shutdown\n", unit);
 341                 goto already;
 342         }
 343
 344         sm->unit_power[unit] += to ? 1 : -1;
 345         to = sm->unit_power[unit] ? 1 : 0;
 346
 347         if (to) {
 348                 if (gate & (1 << unit))
 349                         goto already;
 350                 gate |= (1 << unit);
 351         } else {
 352                 if (!(gate & (1 << unit)))
 353                         goto already;
 354                 gate &= ~(1 << unit);
 355         }
 356
 357         switch (mode) {
 358         case 1:
 359                 smc501_writel(gate, sm->regs + SM501_POWER_MODE_0_GATE);
 360                 smc501_writel(clock, sm->regs + SM501_POWER_MODE_0_CLOCK);
 361                 mode = 0;
 362                 break;
 363         case 2:
 364         case 0:
 365                 smc501_writel(gate, sm->regs + SM501_POWER_MODE_1_GATE);
 366                 smc501_writel(clock, sm->regs + SM501_POWER_MODE_1_CLOCK);
 367                 mode = 1;
 368                 break;
 369
 370         default:
 371                 gate = -1;
 372                 goto already;
 373         }
 374
 375         smc501_writel(mode, sm->regs + SM501_POWER_MODE_CONTROL);
 376         sm501_sync_regs(sm);
 377
 378         dev_dbg(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n",
 379                 gate, clock, mode);
 380
 381         sm501_mdelay(sm, 16);
 382
 383  already:
 384         mutex_unlock(&sm->clock_lock);
 385         return gate;
 386 }
 387
 388 EXPORT_SYMBOL_GPL(sm501_unit_power);
 389
 390 /* clock value structure. */
 391 struct sm501_clock {
 392         unsigned long mclk;
 393         int divider;
 394         int shift;
 395         unsigned int m, n, k;
 396 };
 397
 398 /* sm501_calc_clock
 399  *
 400  * Calculates the nearest discrete clock frequency that
 401  * can be achieved with the specified input clock.
 402  *   the maximum divisor is 3 or 5
 403  */
 404
 405 static int sm501_calc_clock(unsigned long freq,
 406                             struct sm501_clock *clock,
 407                             int max_div,
 408                             unsigned long mclk,
 409                             long *best_diff)
 410 {
 411         int ret = 0;
 412         int divider;
 413         int shift;
 414         long diff;
 415
 416         /* try dividers 1 and 3 for CRT and for panel,
 417            try divider 5 for panel only.*/
 418
 419         for (divider = 1; divider <= max_div; divider += 2) {
 420                 /* try all 8 shift values.*/
 421                 for (shift = 0; shift < 8; shift++) {
 422                         /* Calculate difference to requested clock */
 423                         diff = DIV_ROUND_CLOSEST(mclk, divider << shift) - freq;
 424                         if (diff < 0)
 425                                 diff = -diff;
 426
 427                         /* If it is less than the current, use it */
 428                         if (diff < *best_diff) {
 429                                 *best_diff = diff;
 430
 431                                 clock->mclk = mclk;
 432                                 clock->divider = divider;
 433                                 clock->shift = shift;
 434                                 ret = 1;
 435                         }
 436                 }
 437         }
 438
 439         return ret;
 440 }
 441
 442 /* sm501_calc_pll
 443  *
 444  * Calculates the nearest discrete clock frequency that can be
 445  * achieved using the programmable PLL.
 446  *   the maximum divisor is 3 or 5
 447  */
 448
 449 static unsigned long sm501_calc_pll(unsigned long freq,
 450                                         struct sm501_clock *clock,
 451                                         int max_div)
 452 {
 453         unsigned long mclk;
 454         unsigned int m, n, k;
 455         long best_diff = 999999999;
 456
 457         /*
 458          * The SM502 datasheet doesn't specify the min/max values for M and N.
 459          * N = 1 at least doesn't work in practice.
 460          */
 461         for (m = 2; m <= 255; m++) {
 462                 for (n = 2; n <= 127; n++) {
 463                         for (k = 0; k <= 1; k++) {
 464                                 mclk = (24000000UL * m / n) >> k;
 465
 466                                 if (sm501_calc_clock(freq, clock, max_div,
 467                                                      mclk, &best_diff)) {
 468                                         clock->m = m;
 469                                         clock->n = n;
 470                                         clock->k = k;
 471                                 }
 472                         }
 473                 }
 474         }
 475
 476         /* Return best clock. */
 477         return clock->mclk / (clock->divider << clock->shift);
 478 }
 479
 480 /* sm501_select_clock
 481  *
 482  * Calculates the nearest discrete clock frequency that can be
 483  * achieved using the 288MHz and 336MHz PLLs.
 484  *   the maximum divisor is 3 or 5
 485  */
 486
 487 static unsigned long sm501_select_clock(unsigned long freq,
 488                                         struct sm501_clock *clock,
 489                                         int max_div)
 490 {
 491         unsigned long mclk;
 492         long best_diff = 999999999;
 493
 494         /* Try 288MHz and 336MHz clocks. */
 495         for (mclk = 288000000; mclk <= 336000000; mclk += 48000000) {
 496                 sm501_calc_clock(freq, clock, max_div, mclk, &best_diff);
 497         }
 498
 499         /* Return best clock. */
 500         return clock->mclk / (clock->divider << clock->shift);
 501 }
 502
 503 /* sm501_set_clock
 504  *
 505  * set one of the four clock sources to the closest available frequency to
 506  *  the one specified
 507 */
 508
 509 unsigned long sm501_set_clock(struct device *dev,
 510                               int clksrc,
 511                               unsigned long req_freq)
 512 {
 513         struct sm501_devdata *sm = dev_get_drvdata(dev);
 514         unsigned long mode = smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL);
 515         unsigned long gate = smc501_readl(sm->regs + SM501_CURRENT_GATE);
 516         unsigned long clock = smc501_readl(sm->regs + SM501_CURRENT_CLOCK);
 517         unsigned char reg;
 518         unsigned int pll_reg = 0;
 519         unsigned long sm501_freq; /* the actual frequency achieved */
 520
 521         struct sm501_clock to;
 522
 523         /* find achivable discrete frequency and setup register value
 524          * accordingly, V2XCLK, MCLK and M1XCLK are the same P2XCLK
 525          * has an extra bit for the divider */
 526
 527         switch (clksrc) {
 528         case SM501_CLOCK_P2XCLK:
 529                 /* This clock is divided in half so to achieve the
 530                  * requested frequency the value must be multiplied by
 531                  * 2. This clock also has an additional pre divisor */
 532
 533                 if (sm->rev >= 0xC0) {
 534                         /* SM502 -> use the programmable PLL */
 535                         sm501_freq = (sm501_calc_pll(2 * req_freq,
 536                                                      &to, 5) / 2);
 537                         reg = to.shift & 0x07;/* bottom 3 bits are shift */
 538                         if (to.divider == 3)
 539                                 reg |= 0x08; /* /3 divider required */
 540                         else if (to.divider == 5)
 541                                 reg |= 0x10; /* /5 divider required */
 542                         reg |= 0x40; /* select the programmable PLL */
 543                         pll_reg = 0x20000 | (to.k << 15) | (to.n << 8) | to.m;
 544                 } else {
 545                         sm501_freq = (sm501_select_clock(2 * req_freq,
 546                                                          &to, 5) / 2);
 547                         reg = to.shift & 0x07;/* bottom 3 bits are shift */
 548                         if (to.divider == 3)
 549                                 reg |= 0x08; /* /3 divider required */
 550                         else if (to.divider == 5)
 551                                 reg |= 0x10; /* /5 divider required */
 552                         if (to.mclk != 288000000)
 553                                 reg |= 0x20; /* which mclk pll is source */
 554                 }
 555                 break;
 556
 557         case SM501_CLOCK_V2XCLK:
 558                 /* This clock is divided in half so to achieve the
 559                  * requested frequency the value must be multiplied by 2. */
 560
 561                 sm501_freq = (sm501_select_clock(2 * req_freq, &to, 3) / 2);
 562                 reg=to.shift & 0x07;    /* bottom 3 bits are shift */
 563                 if (to.divider == 3)
 564                         reg |= 0x08;    /* /3 divider required */
 565                 if (to.mclk != 288000000)
 566                         reg |= 0x10;    /* which mclk pll is source */
 567                 break;
 568
 569         case SM501_CLOCK_MCLK:
 570         case SM501_CLOCK_M1XCLK:
 571                 /* These clocks are the same and not further divided */
 572
 573                 sm501_freq = sm501_select_clock( req_freq, &to, 3);
 574                 reg=to.shift & 0x07;    /* bottom 3 bits are shift */
 575                 if (to.divider == 3)
 576                         reg |= 0x08;    /* /3 divider required */
 577                 if (to.mclk != 288000000)
 578                         reg |= 0x10;    /* which mclk pll is source */
 579                 break;
 580
 581         default:
 582                 return 0; /* this is bad */
 583         }
 584
 585         mutex_lock(&sm->clock_lock);
 586
 587         mode = smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL);
 588         gate = smc501_readl(sm->regs + SM501_CURRENT_GATE);
 589         clock = smc501_readl(sm->regs + SM501_CURRENT_CLOCK);
 590
 591         clock = clock & ~(0xFF << clksrc);
 592         clock |= reg<<clksrc;
 593
 594         mode &= 3;      /* find current mode */
 595
 596         switch (mode) {
 597         case 1:
 598                 smc501_writel(gate, sm->regs + SM501_POWER_MODE_0_GATE);
 599                 smc501_writel(clock, sm->regs + SM501_POWER_MODE_0_CLOCK);
 600                 mode = 0;
 601                 break;
 602         case 2:
 603         case 0:
 604                 smc501_writel(gate, sm->regs + SM501_POWER_MODE_1_GATE);
 605                 smc501_writel(clock, sm->regs + SM501_POWER_MODE_1_CLOCK);
 606                 mode = 1;
 607                 break;
 608
 609         default:
 610                 mutex_unlock(&sm->clock_lock);
 611                 return -1;
 612         }
 613
 614         smc501_writel(mode, sm->regs + SM501_POWER_MODE_CONTROL);
 615
 616         if (pll_reg)
 617                 smc501_writel(pll_reg,
 618                                 sm->regs + SM501_PROGRAMMABLE_PLL_CONTROL);
 619
 620         sm501_sync_regs(sm);
 621
 622         dev_dbg(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n",
 623                 gate, clock, mode);
 624
 625         sm501_mdelay(sm, 16);
 626         mutex_unlock(&sm->clock_lock);
 627
 628         sm501_dump_clk(sm);
 629
 630         return sm501_freq;
 631 }
 632
 633 EXPORT_SYMBOL_GPL(sm501_set_clock);
 634
 635 /* sm501_find_clock
 636  *
 637  * finds the closest available frequency for a given clock
 638 */
 639
 640 unsigned long sm501_find_clock(struct device *dev,
 641                                int clksrc,
 642                                unsigned long req_freq)
 643 {
 644         struct sm501_devdata *sm = dev_get_drvdata(dev);
 645         unsigned long sm501_freq; /* the frequency achieveable by the 501 */
 646         struct sm501_clock to;
 647
 648         switch (clksrc) {
 649         case SM501_CLOCK_P2XCLK:
 650                 if (sm->rev >= 0xC0) {
 651                         /* SM502 -> use the programmable PLL */
 652                         sm501_freq = (sm501_calc_pll(2 * req_freq,
 653                                                      &to, 5) / 2);
 654                 } else {
 655                         sm501_freq = (sm501_select_clock(2 * req_freq,
 656                                                          &to, 5) / 2);
 657                 }
 658                 break;
 659
 660         case SM501_CLOCK_V2XCLK:
 661                 sm501_freq = (sm501_select_clock(2 * req_freq, &to, 3) / 2);
 662                 break;
 663
 664         case SM501_CLOCK_MCLK:
 665         case SM501_CLOCK_M1XCLK:
 666                 sm501_freq = sm501_select_clock(req_freq, &to, 3);
 667                 break;
 668
 669         default:
 670                 sm501_freq = 0;         /* error */
 671         }
 672
 673         return sm501_freq;
 674 }
 675
 676 EXPORT_SYMBOL_GPL(sm501_find_clock);
 677
 678 static struct sm501_device *to_sm_device(struct platform_device *pdev)
 679 {
 680         return container_of(pdev, struct sm501_device, pdev);
 681 }
 682
 683 /* sm501_device_release
 684  *
 685  * A release function for the platform devices we create to allow us to
 686  * free any items we allocated
 687 */
 688
 689 static void sm501_device_release(struct device *dev)
 690 {
 691         kfree(to_sm_device(to_platform_device(dev)));
 692 }
 693
 694 /* sm501_create_subdev
 695  *
 696  * Create a skeleton platform device with resources for passing to a
 697  * sub-driver
 698 */
 699
 700 static struct platform_device *
 701 sm501_create_subdev(struct sm501_devdata *sm, char *name,
 702                     unsigned int res_count, unsigned int platform_data_size)
 703 {
 704         struct sm501_device *smdev;
 705
 706         smdev = kzalloc(sizeof(struct sm501_device) +
 707                         (sizeof(struct resource) * res_count) +
 708                         platform_data_size, GFP_KERNEL);
 709         if (!smdev)
 710                 return NULL;
 711
 712         smdev->pdev.dev.release = sm501_device_release;
 713
 714         smdev->pdev.name = name;
 715         smdev->pdev.id = sm->pdev_id;
 716         smdev->pdev.dev.parent = sm->dev;
 717
 718         if (res_count) {
 719                 smdev->pdev.resource = (struct resource *)(smdev+1);
 720                 smdev->pdev.num_resources = res_count;
 721         }
 722         if (platform_data_size)
 723                 smdev->pdev.dev.platform_data = (void *)(smdev+1);
 724
 725         return &smdev->pdev;
 726 }
 727
 728 /* sm501_register_device
 729  *
 730  * Register a platform device created with sm501_create_subdev()
 731 */
 732
 733 static int sm501_register_device(struct sm501_devdata *sm,
 734                                  struct platform_device *pdev)
 735 {
 736         struct sm501_device *smdev = to_sm_device(pdev);
 737         int ptr;
 738         int ret;
 739
 740         for (ptr = 0; ptr < pdev->num_resources; ptr++) {
 741                 printk(KERN_DEBUG "%s[%d] %pR\n",
 742                        pdev->name, ptr, &pdev->resource[ptr]);
 743         }
 744
 745         ret = platform_device_register(pdev);
 746
 747         if (ret >= 0) {
 748                 dev_dbg(sm->dev, "registered %s\n", pdev->name);
 749                 list_add_tail(&smdev->list, &sm->devices);
 750         } else
 751                 dev_err(sm->dev, "error registering %s (%d)\n",
 752                         pdev->name, ret);
 753
 754         return ret;
 755 }
 756
 757 /* sm501_create_subio
 758  *
 759  * Fill in an IO resource for a sub device
 760 */
 761
 762 static void sm501_create_subio(struct sm501_devdata *sm,
 763                                struct resource *res,
 764                                resource_size_t offs,
 765                                resource_size_t size)
 766 {
 767         res->flags = IORESOURCE_MEM;
 768         res->parent = sm->io_res;
 769         res->start = sm->io_res->start + offs;
 770         res->end = res->start + size - 1;
 771 }
 772
 773 /* sm501_create_mem
 774  *
 775  * Fill in an MEM resource for a sub device
 776 */
 777
 778 static void sm501_create_mem(struct sm501_devdata *sm,
 779                              struct resource *res,
 780                              resource_size_t *offs,
 781                              resource_size_t size)
 782 {
 783         *offs -= size;          /* adjust memory size */
 784
 785         res->flags = IORESOURCE_MEM;
 786         res->parent = sm->mem_res;
 787         res->start = sm->mem_res->start + *offs;
 788         res->end = res->start + size - 1;
 789 }
 790
 791 /* sm501_create_irq
 792  *
 793  * Fill in an IRQ resource for a sub device
 794 */
 795
 796 static void sm501_create_irq(struct sm501_devdata *sm,
 797                              struct resource *res)
 798 {
 799         res->flags = IORESOURCE_IRQ;
 800         res->parent = NULL;
 801         res->start = res->end = sm->irq;
 802 }
 803
 804 static int sm501_register_usbhost(struct sm501_devdata *sm,
 805                                   resource_size_t *mem_avail)
 806 {
 807         struct platform_device *pdev;
 808
 809         pdev = sm501_create_subdev(sm, "sm501-usb", 3, 0);
 810         if (!pdev)
 811                 return -ENOMEM;
 812
 813         sm501_create_subio(sm, &pdev->resource[0], 0x40000, 0x20000);
 814         sm501_create_mem(sm, &pdev->resource[1], mem_avail, 256*1024);
 815         sm501_create_irq(sm, &pdev->resource[2]);
 816
 817         return sm501_register_device(sm, pdev);
 818 }
 819
 820 static void sm501_setup_uart_data(struct sm501_devdata *sm,
 821                                   struct plat_serial8250_port *uart_data,
 822                                   unsigned int offset)
 823 {
 824         uart_data->membase = sm->regs + offset;
 825         uart_data->mapbase = sm->io_res->start + offset;
 826         uart_data->iotype = UPIO_MEM;
 827         uart_data->irq = sm->irq;
 828         uart_data->flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ;
 829         uart_data->regshift = 2;
 830         uart_data->uartclk = (9600 * 16);
 831 }
 832
 833 static int sm501_register_uart(struct sm501_devdata *sm, int devices)
 834 {
 835         struct platform_device *pdev;
 836         struct plat_serial8250_port *uart_data;
 837
 838         pdev = sm501_create_subdev(sm, "serial8250", 0,
 839                                    sizeof(struct plat_serial8250_port) * 3);
 840         if (!pdev)
 841                 return -ENOMEM;
 842
 843         uart_data = dev_get_platdata(&pdev->dev);
 844
 845         if (devices & SM501_USE_UART0) {
 846                 sm501_setup_uart_data(sm, uart_data++, 0x30000);
 847                 sm501_unit_power(sm->dev, SM501_GATE_UART0, 1);
 848                 sm501_modify_reg(sm->dev, SM501_IRQ_MASK, 1 << 12, 0);
 849                 sm501_modify_reg(sm->dev, SM501_GPIO63_32_CONTROL, 0x01e0, 0);
 850         }
 851         if (devices & SM501_USE_UART1) {
 852                 sm501_setup_uart_data(sm, uart_data++, 0x30020);
 853                 sm501_unit_power(sm->dev, SM501_GATE_UART1, 1);
 854                 sm501_modify_reg(sm->dev, SM501_IRQ_MASK, 1 << 13, 0);
 855                 sm501_modify_reg(sm->dev, SM501_GPIO63_32_CONTROL, 0x1e00, 0);
 856         }
 857
 858         pdev->id = PLAT8250_DEV_SM501;
 859
 860         return sm501_register_device(sm, pdev);
 861 }
 862
 863 static int sm501_register_display(struct sm501_devdata *sm,
 864                                   resource_size_t *mem_avail)
 865 {
 866         struct platform_device *pdev;
 867
 868         pdev = sm501_create_subdev(sm, "sm501-fb", 4, 0);
 869         if (!pdev)
 870                 return -ENOMEM;
 871
 872         sm501_create_subio(sm, &pdev->resource[0], 0x80000, 0x10000);
 873         sm501_create_subio(sm, &pdev->resource[1], 0x100000, 0x50000);
 874         sm501_create_mem(sm, &pdev->resource[2], mem_avail, *mem_avail);
 875         sm501_create_irq(sm, &pdev->resource[3]);
 876
 877         return sm501_register_device(sm, pdev);
 878 }
 879
 880 #ifdef CONFIG_MFD_SM501_GPIO
 881
 882 static inline struct sm501_gpio_chip *to_sm501_gpio(struct gpio_chip *gc)
 883 {
 884         return container_of(gc, struct sm501_gpio_chip, gpio);
 885 }
 886
 887 static inline struct sm501_devdata *sm501_gpio_to_dev(struct sm501_gpio *gpio)
 888 {
 889         return container_of(gpio, struct sm501_devdata, gpio);
 890 }
 891
 892 static int sm501_gpio_get(struct gpio_chip *chip, unsigned offset)
 893
 894 {
 895         struct sm501_gpio_chip *smgpio = to_sm501_gpio(chip);
 896         unsigned long result;
 897
 898         result = smc501_readl(smgpio->regbase + SM501_GPIO_DATA_LOW);
 899         result >>= offset;
 900
 901         return result & 1UL;
 902 }
 903
 904 static void sm501_gpio_ensure_gpio(struct sm501_gpio_chip *smchip,
 905                                    unsigned long bit)
 906 {
 907         unsigned long ctrl;
 908
 909         /* check and modify if this pin is not set as gpio. */
 910
 911         if (smc501_readl(smchip->control) & bit) {
 912                 dev_info(sm501_gpio_to_dev(smchip->ourgpio)->dev,
 913                          "changing mode of gpio, bit %08lx\n", bit);
 914
 915                 ctrl = smc501_readl(smchip->control);
 916                 ctrl &= ~bit;
 917                 smc501_writel(ctrl, smchip->control);
 918
 919                 sm501_sync_regs(sm501_gpio_to_dev(smchip->ourgpio));
 920         }
 921 }
 922
 923 static void sm501_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 924
 925 {
 926         struct sm501_gpio_chip *smchip = to_sm501_gpio(chip);
 927         struct sm501_gpio *smgpio = smchip->ourgpio;
 928         unsigned long bit = 1 << offset;
 929         void __iomem *regs = smchip->regbase;
 930         unsigned long save;
 931         unsigned long val;
 932
 933         dev_dbg(sm501_gpio_to_dev(smgpio)->dev, "%s(%p,%d)\n",
 934                 __func__, chip, offset);
 935
 936         spin_lock_irqsave(&smgpio->lock, save);
 937
 938         val = smc501_readl(regs + SM501_GPIO_DATA_LOW) & ~bit;
 939         if (value)
 940                 val |= bit;
 941         smc501_writel(val, regs);
 942
 943         sm501_sync_regs(sm501_gpio_to_dev(smgpio));
 944         sm501_gpio_ensure_gpio(smchip, bit);
 945
 946         spin_unlock_irqrestore(&smgpio->lock, save);
 947 }
 948
 949 static int sm501_gpio_input(struct gpio_chip *chip, unsigned offset)
 950 {
 951         struct sm501_gpio_chip *smchip = to_sm501_gpio(chip);
 952         struct sm501_gpio *smgpio = smchip->ourgpio;
 953         void __iomem *regs = smchip->regbase;
 954         unsigned long bit = 1 << offset;
 955         unsigned long save;
 956         unsigned long ddr;
 957
 958         dev_dbg(sm501_gpio_to_dev(smgpio)->dev, "%s(%p,%d)\n",
 959                 __func__, chip, offset);
 960
 961         spin_lock_irqsave(&smgpio->lock, save);
 962
 963         ddr = smc501_readl(regs + SM501_GPIO_DDR_LOW);
 964         smc501_writel(ddr & ~bit, regs + SM501_GPIO_DDR_LOW);
 965
 966         sm501_sync_regs(sm501_gpio_to_dev(smgpio));
 967         sm501_gpio_ensure_gpio(smchip, bit);
 968
 969         spin_unlock_irqrestore(&smgpio->lock, save);
 970
 971         return 0;
 972 }
 973
 974 static int sm501_gpio_output(struct gpio_chip *chip,
 975                              unsigned offset, int value)
 976 {
 977         struct sm501_gpio_chip *smchip = to_sm501_gpio(chip);
 978         struct sm501_gpio *smgpio = smchip->ourgpio;
 979         unsigned long bit = 1 << offset;
 980         void __iomem *regs = smchip->regbase;
 981         unsigned long save;
 982         unsigned long val;
 983         unsigned long ddr;
 984
 985         dev_dbg(sm501_gpio_to_dev(smgpio)->dev, "%s(%p,%d,%d)\n",
 986                 __func__, chip, offset, value);
 987
 988         spin_lock_irqsave(&smgpio->lock, save);
 989
 990         val = smc501_readl(regs + SM501_GPIO_DATA_LOW);
 991         if (value)
 992                 val |= bit;
 993         else
 994                 val &= ~bit;
 995         smc501_writel(val, regs);
 996
 997         ddr = smc501_readl(regs + SM501_GPIO_DDR_LOW);
 998         smc501_writel(ddr | bit, regs + SM501_GPIO_DDR_LOW);
 999
1000         sm501_sync_regs(sm501_gpio_to_dev(smgpio));
1001         smc501_writel(val, regs + SM501_GPIO_DATA_LOW);
1002
1003         sm501_sync_regs(sm501_gpio_to_dev(smgpio));
1004         spin_unlock_irqrestore(&smgpio->lock, save);
1005
1006         return 0;
1007 }
1008
1009 static struct gpio_chip gpio_chip_template = {
1010         .ngpio                  = 32,
1011         .direction_input        = sm501_gpio_input,
1012         .direction_output       = sm501_gpio_output,
1013         .set                    = sm501_gpio_set,
1014         .get                    = sm501_gpio_get,
1015 };
1016
1017 static int sm501_gpio_register_chip(struct sm501_devdata *sm,
1018                                               struct sm501_gpio *gpio,
1019                                               struct sm501_gpio_chip *chip)
1020 {
1021         struct sm501_platdata *pdata = sm->platdata;
1022         struct gpio_chip *gchip = &chip->gpio;
1023         int base = pdata->gpio_base;
1024
1025         chip->gpio = gpio_chip_template;
1026
1027         if (chip == &gpio->high) {
1028                 if (base > 0)
1029                         base += 32;
1030                 chip->regbase = gpio->regs + SM501_GPIO_DATA_HIGH;
1031                 chip->control = sm->regs + SM501_GPIO63_32_CONTROL;
1032                 gchip->label  = "SM501-HIGH";
1033         } else {
1034                 chip->regbase = gpio->regs + SM501_GPIO_DATA_LOW;
1035                 chip->control = sm->regs + SM501_GPIO31_0_CONTROL;
1036                 gchip->label  = "SM501-LOW";
1037         }
1038
1039         gchip->base   = base;
1040         chip->ourgpio = gpio;
1041
1042         return gpiochip_add(gchip);
1043 }
1044
1045 static int sm501_register_gpio(struct sm501_devdata *sm)
1046 {
1047         struct sm501_gpio *gpio = &sm->gpio;
1048         resource_size_t iobase = sm->io_res->start + SM501_GPIO;
1049         int ret;
1050         int tmp;
1051
1052         dev_dbg(sm->dev, "registering gpio block %08llx\n",
1053                 (unsigned long long)iobase);
1054
1055         spin_lock_init(&gpio->lock);
1056
1057         gpio->regs_res = request_mem_region(iobase, 0x20, "sm501-gpio");
1058         if (gpio->regs_res == NULL) {
1059                 dev_err(sm->dev, "gpio: failed to request region\n");
1060                 return -ENXIO;
1061         }
1062
1063         gpio->regs = ioremap(iobase, 0x20);
1064         if (gpio->regs == NULL) {
1065                 dev_err(sm->dev, "gpio: failed to remap registers\n");
1066                 ret = -ENXIO;
1067                 goto err_claimed;
1068         }
1069
1070         /* Register both our chips. */
1071
1072         ret = sm501_gpio_register_chip(sm, gpio, &gpio->low);
1073         if (ret) {
1074                 dev_err(sm->dev, "failed to add low chip\n");
1075                 goto err_mapped;
1076         }
1077
1078         ret = sm501_gpio_register_chip(sm, gpio, &gpio->high);
1079         if (ret) {
1080                 dev_err(sm->dev, "failed to add high chip\n");
1081                 goto err_low_chip;
1082         }
1083
1084         gpio->registered = 1;
1085
1086         return 0;
1087
1088  err_low_chip:
1089         tmp = gpiochip_remove(&gpio->low.gpio);
1090         if (tmp) {
1091                 dev_err(sm->dev, "cannot remove low chip, cannot tidy up\n");
1092                 return ret;
1093         }
1094
1095  err_mapped:
1096         iounmap(gpio->regs);
1097
1098  err_claimed:
1099         release_resource(gpio->regs_res);
1100         kfree(gpio->regs_res);
1101
1102         return ret;
1103 }
1104
1105 static void sm501_gpio_remove(struct sm501_devdata *sm)
1106 {
1107         struct sm501_gpio *gpio = &sm->gpio;
1108         int ret;
1109
1110         if (!sm->gpio.registered)
1111                 return;
1112
1113         ret = gpiochip_remove(&gpio->low.gpio);
1114         if (ret)
1115                 dev_err(sm->dev, "cannot remove low chip, cannot tidy up\n");
1116
1117         ret = gpiochip_remove(&gpio->high.gpio);
1118         if (ret)
1119                 dev_err(sm->dev, "cannot remove high chip, cannot tidy up\n");
1120
1121         iounmap(gpio->regs);
1122         release_resource(gpio->regs_res);
1123         kfree(gpio->regs_res);
1124 }
1125
1126 static inline int sm501_gpio_pin2nr(struct sm501_devdata *sm, unsigned int pin)
1127 {
1128         struct sm501_gpio *gpio = &sm->gpio;
1129         int base = (pin < 32) ? gpio->low.gpio.base : gpio->high.gpio.base;
1130
1131         return (pin % 32) + base;
1132 }
1133
1134 static inline int sm501_gpio_isregistered(struct sm501_devdata *sm)
1135 {
1136         return sm->gpio.registered;
1137 }
1138 #else
1139 static inline int sm501_register_gpio(struct sm501_devdata *sm)
1140 {
1141         return 0;
1142 }
1143
1144 static inline void sm501_gpio_remove(struct sm501_devdata *sm)
1145 {
1146 }
1147
1148 static inline int sm501_gpio_pin2nr(struct sm501_devdata *sm, unsigned int pin)
1149 {
1150         return -1;
1151 }
1152
1153 static inline int sm501_gpio_isregistered(struct sm501_devdata *sm)
1154 {
1155         return 0;
1156 }
1157 #endif
1158
1159 static int sm501_register_gpio_i2c_instance(struct sm501_devdata *sm,
1160                                             struct sm501_platdata_gpio_i2c *iic)
1161 {
1162         struct i2c_gpio_platform_data *icd;
1163         struct platform_device *pdev;
1164
1165         pdev = sm501_create_subdev(sm, "i2c-gpio", 0,
1166                                    sizeof(struct i2c_gpio_platform_data));
1167         if (!pdev)
1168                 return -ENOMEM;
1169
1170         icd = dev_get_platdata(&pdev->dev);
1171
1172         /* We keep the pin_sda and pin_scl fields relative in case the
1173          * same platform data is passed to >1 SM501.
1174          */
1175
1176         icd->sda_pin = sm501_gpio_pin2nr(sm, iic->pin_sda);
1177         icd->scl_pin = sm501_gpio_pin2nr(sm, iic->pin_scl);
1178         icd->timeout = iic->timeout;
1179         icd->udelay = iic->udelay;
1180
1181         /* note, we can't use either of the pin numbers, as the i2c-gpio
1182          * driver uses the platform.id field to generate the bus number
1183          * to register with the i2c core; The i2c core doesn't have enough
1184          * entries to deal with anything we currently use.
1185         */
1186
1187         pdev->id = iic->bus_num;
1188
1189         dev_info(sm->dev, "registering i2c-%d: sda=%d (%d), scl=%d (%d)\n",
1190                  iic->bus_num,
1191                  icd->sda_pin, iic->pin_sda, icd->scl_pin, iic->pin_scl);
1192
1193         return sm501_register_device(sm, pdev);
1194 }
1195
1196 static int sm501_register_gpio_i2c(struct sm501_devdata *sm,
1197                                    struct sm501_platdata *pdata)
1198 {
1199         struct sm501_platdata_gpio_i2c *iic = pdata->gpio_i2c;
1200         int index;
1201         int ret;
1202
1203         for (index = 0; index < pdata->gpio_i2c_nr; index++, iic++) {
1204                 ret = sm501_register_gpio_i2c_instance(sm, iic);
1205                 if (ret < 0)
1206                         return ret;
1207         }
1208
1209         return 0;
1210 }
1211
1212 /* sm501_dbg_regs
1213  *
1214  * Debug attribute to attach to parent device to show core registers
1215 */
1216
1217 static ssize_t sm501_dbg_regs(struct device *dev,
1218                               struct device_attribute *attr, char *buff)
1219 {
1220         struct sm501_devdata *sm = dev_get_drvdata(dev) ;
1221         unsigned int reg;
1222         char *ptr = buff;
1223         int ret;
1224
1225         for (reg = 0x00; reg < 0x70; reg += 4) {
1226                 ret = sprintf(ptr, "%08x = %08x\n",
1227                               reg, smc501_readl(sm->regs + reg));
1228                 ptr += ret;
1229         }
1230
1231         return ptr - buff;
1232 }
1233
1234
1235 static DEVICE_ATTR(dbg_regs, 0444, sm501_dbg_regs, NULL);
1236
1237 /* sm501_init_reg
1238  *
1239  * Helper function for the init code to setup a register
1240  *
1241  * clear the bits which are set in r->mask, and then set
1242  * the bits set in r->set.
1243 */
1244
1245 static inline void sm501_init_reg(struct sm501_devdata *sm,
1246                                   unsigned long reg,
1247                                   struct sm501_reg_init *r)
1248 {
1249         unsigned long tmp;
1250
1251         tmp = smc501_readl(sm->regs + reg);
1252         tmp &= ~r->mask;
1253         tmp |= r->set;
1254         smc501_writel(tmp, sm->regs + reg);
1255 }
1256
1257 /* sm501_init_regs
1258  *
1259  * Setup core register values
1260 */
1261
1262 static void sm501_init_regs(struct sm501_devdata *sm,
1263                             struct sm501_initdata *init)
1264 {
1265         sm501_misc_control(sm->dev,
1266                            init->misc_control.set,
1267                            init->misc_control.mask);
1268
1269         sm501_init_reg(sm, SM501_MISC_TIMING, &init->misc_timing);
1270         sm501_init_reg(sm, SM501_GPIO31_0_CONTROL, &init->gpio_low);
1271         sm501_init_reg(sm, SM501_GPIO63_32_CONTROL, &init->gpio_high);
1272
1273         if (init->m1xclk) {
1274                 dev_info(sm->dev, "setting M1XCLK to %ld\n", init->m1xclk);
1275                 sm501_set_clock(sm->dev, SM501_CLOCK_M1XCLK, init->m1xclk);
1276         }
1277
1278         if (init->mclk) {
1279                 dev_info(sm->dev, "setting MCLK to %ld\n", init->mclk);
1280                 sm501_set_clock(sm->dev, SM501_CLOCK_MCLK, init->mclk);
1281         }
1282
1283 }
1284
1285 /* Check the PLL sources for the M1CLK and M1XCLK
1286  *
1287  * If the M1CLK and M1XCLKs are not sourced from the same PLL, then
1288  * there is a risk (see errata AB-5) that the SM501 will cease proper
1289  * function. If this happens, then it is likely the SM501 will
1290  * hang the system.
1291 */
1292
1293 static int sm501_check_clocks(struct sm501_devdata *sm)
1294 {
1295         unsigned long pwrmode = smc501_readl(sm->regs + SM501_CURRENT_CLOCK);
1296         unsigned long msrc = (pwrmode & SM501_POWERMODE_M_SRC);
1297         unsigned long m1src = (pwrmode & SM501_POWERMODE_M1_SRC);
1298
1299         return ((msrc == 0 && m1src != 0) || (msrc != 0 && m1src == 0));
1300 }
1301
1302 static unsigned int sm501_mem_local[] = {
1303         [0]     = 4*1024*1024,
1304         [1]     = 8*1024*1024,
1305         [2]     = 16*1024*1024,
1306         [3]     = 32*1024*1024,
1307         [4]     = 64*1024*1024,
1308         [5]     = 2*1024*1024,
1309 };
1310
1311 /* sm501_init_dev
1312  *
1313  * Common init code for an SM501
1314 */
1315
1316 static int sm501_init_dev(struct sm501_devdata *sm)
1317 {
1318         struct sm501_initdata *idata;
1319         struct sm501_platdata *pdata;
1320         resource_size_t mem_avail;
1321         unsigned long dramctrl;
1322         unsigned long devid;
1323         int ret;
1324
1325         mutex_init(&sm->clock_lock);
1326         spin_lock_init(&sm->reg_lock);
1327
1328         INIT_LIST_HEAD(&sm->devices);
1329
1330         devid = smc501_readl(sm->regs + SM501_DEVICEID);
1331
1332         if ((devid & SM501_DEVICEID_IDMASK) != SM501_DEVICEID_SM501) {
1333                 dev_err(sm->dev, "incorrect device id %08lx\n", devid);
1334                 return -EINVAL;
1335         }
1336
1337         /* disable irqs */
1338         smc501_writel(0, sm->regs + SM501_IRQ_MASK);
1339
1340         dramctrl = smc501_readl(sm->regs + SM501_DRAM_CONTROL);
1341         mem_avail = sm501_mem_local[(dramctrl >> 13) & 0x7];
1342
1343         dev_info(sm->dev, "SM501 At %p: Version %08lx, %ld Mb, IRQ %d\n",
1344                  sm->regs, devid, (unsigned long)mem_avail >> 20, sm->irq);
1345
1346         sm->rev = devid & SM501_DEVICEID_REVMASK;
1347
1348         sm501_dump_gate(sm);
1349
1350         ret = device_create_file(sm->dev, &dev_attr_dbg_regs);
1351         if (ret)
1352                 dev_err(sm->dev, "failed to create debug regs file\n");
1353
1354         sm501_dump_clk(sm);
1355
1356         /* check to see if we have some device initialisation */
1357
1358         pdata = sm->platdata;
1359         idata = pdata ? pdata->init : NULL;
1360
1361         if (idata) {
1362                 sm501_init_regs(sm, idata);
1363
1364                 if (idata->devices & SM501_USE_USB_HOST)
1365                         sm501_register_usbhost(sm, &mem_avail);
1366                 if (idata->devices & (SM501_USE_UART0 | SM501_USE_UART1))
1367                         sm501_register_uart(sm, idata->devices);
1368                 if (idata->devices & SM501_USE_GPIO)
1369                         sm501_register_gpio(sm);
1370         }
1371
1372         if (pdata && pdata->gpio_i2c != NULL && pdata->gpio_i2c_nr > 0) {
1373                 if (!sm501_gpio_isregistered(sm))
1374                         dev_err(sm->dev, "no gpio available for i2c gpio.\n");
1375                 else
1376                         sm501_register_gpio_i2c(sm, pdata);
1377         }
1378
1379         ret = sm501_check_clocks(sm);
1380         if (ret) {
1381                 dev_err(sm->dev, "M1X and M clocks sourced from different "
1382                                         "PLLs\n");
1383                 return -EINVAL;
1384         }
1385
1386         /* always create a framebuffer */
1387         sm501_register_display(sm, &mem_avail);
1388
1389         return 0;
1390 }
1391
1392 static int sm501_plat_probe(struct platform_device *dev)
1393 {
1394         struct sm501_devdata *sm;
1395         int ret;
1396
1397         sm = kzalloc(sizeof(struct sm501_devdata), GFP_KERNEL);
1398         if (sm == NULL) {
1399                 dev_err(&dev->dev, "no memory for device data\n");
1400                 ret = -ENOMEM;
1401                 goto err1;
1402         }
1403
1404         sm->dev = &dev->dev;
1405         sm->pdev_id = dev->id;
1406         sm->platdata = dev_get_platdata(&dev->dev);
1407
1408         ret = platform_get_irq(dev, 0);
1409         if (ret < 0) {
1410                 dev_err(&dev->dev, "failed to get irq resource\n");
1411                 goto err_res;
1412         }
1413         sm->irq = ret;
1414
1415         sm->io_res = platform_get_resource(dev, IORESOURCE_MEM, 1);
1416         sm->mem_res = platform_get_resource(dev, IORESOURCE_MEM, 0);
1417
1418         if (sm->io_res == NULL || sm->mem_res == NULL) {
1419                 dev_err(&dev->dev, "failed to get IO resource\n");
1420                 ret = -ENOENT;
1421                 goto err_res;
1422         }
1423
1424         sm->regs_claim = request_mem_region(sm->io_res->start,
1425                                             0x100, "sm501");
1426
1427         if (sm->regs_claim == NULL) {
1428                 dev_err(&dev->dev, "cannot claim registers\n");
1429                 ret = -EBUSY;
1430                 goto err_res;
1431         }
1432
1433         platform_set_drvdata(dev, sm);
1434
1435         sm->regs = ioremap(sm->io_res->start, resource_size(sm->io_res));
1436
1437         if (sm->regs == NULL) {
1438                 dev_err(&dev->dev, "cannot remap registers\n");
1439                 ret = -EIO;
1440                 goto err_claim;
1441         }
1442
1443         return sm501_init_dev(sm);
1444
1445  err_claim:
1446         release_resource(sm->regs_claim);
1447         kfree(sm->regs_claim);
1448  err_res:
1449         kfree(sm);
1450  err1:
1451         return ret;
1452
1453 }
1454
1455 #ifdef CONFIG_PM
1456
1457 /* power management support */
1458
1459 static void sm501_set_power(struct sm501_devdata *sm, int on)
1460 {
1461         struct sm501_platdata *pd = sm->platdata;
1462
1463         if (pd == NULL)
1464                 return;
1465
1466         if (pd->get_power) {
1467                 if (pd->get_power(sm->dev) == on) {
1468                         dev_dbg(sm->dev, "is already %d\n", on);
1469                         return;
1470                 }
1471         }
1472
1473         if (pd->set_power) {
1474                 dev_dbg(sm->dev, "setting power to %d\n", on);
1475
1476                 pd->set_power(sm->dev, on);
1477                 sm501_mdelay(sm, 10);
1478         }
1479 }
1480
1481 static int sm501_plat_suspend(struct platform_device *pdev, pm_message_t state)
1482 {
1483         struct sm501_devdata *sm = platform_get_drvdata(pdev);
1484
1485         sm->in_suspend = 1;
1486         sm->pm_misc = smc501_readl(sm->regs + SM501_MISC_CONTROL);
1487
1488         sm501_dump_regs(sm);
1489
1490         if (sm->platdata) {
1491                 if (sm->platdata->flags & SM501_FLAG_SUSPEND_OFF)
1492                         sm501_set_power(sm, 0);
1493         }
1494
1495         return 0;
1496 }
1497
1498 static int sm501_plat_resume(struct platform_device *pdev)
1499 {
1500         struct sm501_devdata *sm = platform_get_drvdata(pdev);
1501
1502         sm501_set_power(sm, 1);
1503
1504         sm501_dump_regs(sm);
1505         sm501_dump_gate(sm);
1506         sm501_dump_clk(sm);
1507
1508         /* check to see if we are in the same state as when suspended */
1509
1510         if (smc501_readl(sm->regs + SM501_MISC_CONTROL) != sm->pm_misc) {
1511                 dev_info(sm->dev, "SM501_MISC_CONTROL changed over sleep\n");
1512                 smc501_writel(sm->pm_misc, sm->regs + SM501_MISC_CONTROL);
1513
1514                 /* our suspend causes the controller state to change,
1515                  * either by something attempting setup, power loss,
1516                  * or an external reset event on power change */
1517
1518                 if (sm->platdata && sm->platdata->init) {
1519                         sm501_init_regs(sm, sm->platdata->init);
1520                 }
1521         }
1522
1523         /* dump our state from resume */
1524
1525         sm501_dump_regs(sm);
1526         sm501_dump_clk(sm);
1527
1528         sm->in_suspend = 0;
1529
1530         return 0;
1531 }
1532 #else
1533 #define sm501_plat_suspend NULL
1534 #define sm501_plat_resume NULL
1535 #endif
1536
1537 /* Initialisation data for PCI devices */
1538
1539 static struct sm501_initdata sm501_pci_initdata = {
1540         .gpio_high      = {
1541                 .set    = 0x3F000000,           /* 24bit panel */
1542                 .mask   = 0x0,
1543         },
1544         .misc_timing    = {
1545                 .set    = 0x010100,             /* SDRAM timing */
1546                 .mask   = 0x1F1F00,
1547         },
1548         .misc_control   = {
1549                 .set    = SM501_MISC_PNL_24BIT,
1550                 .mask   = 0,
1551         },
1552
1553         .devices        = SM501_USE_ALL,
1554
1555         /* Errata AB-3 says that 72MHz is the fastest available
1556          * for 33MHZ PCI with proper bus-mastering operation */
1557
1558         .mclk           = 72 * MHZ,
1559         .m1xclk         = 144 * MHZ,
1560 };
1561
1562 static struct sm501_platdata_fbsub sm501_pdata_fbsub = {
1563         .flags          = (SM501FB_FLAG_USE_INIT_MODE |
1564                            SM501FB_FLAG_USE_HWCURSOR |
1565                            SM501FB_FLAG_USE_HWACCEL |
1566                            SM501FB_FLAG_DISABLE_AT_EXIT),
1567 };
1568
1569 static struct sm501_platdata_fb sm501_fb_pdata = {
1570         .fb_route       = SM501_FB_OWN,
1571         .fb_crt         = &sm501_pdata_fbsub,
1572         .fb_pnl         = &sm501_pdata_fbsub,
1573 };
1574
1575 static struct sm501_platdata sm501_pci_platdata = {
1576         .init           = &sm501_pci_initdata,
1577         .fb             = &sm501_fb_pdata,
1578         .gpio_base      = -1,
1579 };
1580
1581 static int sm501_pci_probe(struct pci_dev *dev,
1582                                      const struct pci_device_id *id)
1583 {
1584         struct sm501_devdata *sm;
1585         int err;
1586
1587         sm = kzalloc(sizeof(struct sm501_devdata), GFP_KERNEL);
1588         if (sm == NULL) {
1589                 dev_err(&dev->dev, "no memory for device data\n");
1590                 err = -ENOMEM;
1591                 goto err1;
1592         }
1593
1594         /* set a default set of platform data */
1595         dev->dev.platform_data = sm->platdata = &sm501_pci_platdata;
1596
1597         /* set a hopefully unique id for our child platform devices */
1598         sm->pdev_id = 32 + dev->devfn;
1599
1600         pci_set_drvdata(dev, sm);
1601
1602         err = pci_enable_device(dev);
1603         if (err) {
1604                 dev_err(&dev->dev, "cannot enable device\n");
1605                 goto err2;
1606         }
1607
1608         sm->dev = &dev->dev;
1609         sm->irq = dev->irq;
1610
1611 #ifdef __BIG_ENDIAN
1612         /* if the system is big-endian, we most probably have a
1613          * translation in the IO layer making the PCI bus little endian
1614          * so make the framebuffer swapped pixels */
1615
1616         sm501_fb_pdata.flags |= SM501_FBPD_SWAP_FB_ENDIAN;
1617 #endif
1618
1619         /* check our resources */
1620
1621         if (!(pci_resource_flags(dev, 0) & IORESOURCE_MEM)) {
1622                 dev_err(&dev->dev, "region #0 is not memory?\n");
1623                 err = -EINVAL;
1624                 goto err3;
1625         }
1626
1627         if (!(pci_resource_flags(dev, 1) & IORESOURCE_MEM)) {
1628                 dev_err(&dev->dev, "region #1 is not memory?\n");
1629                 err = -EINVAL;
1630                 goto err3;
1631         }
1632
1633         /* make our resources ready for sharing */
1634
1635         sm->io_res = &dev->resource[1];
1636         sm->mem_res = &dev->resource[0];
1637
1638         sm->regs_claim = request_mem_region(sm->io_res->start,
1639                                             0x100, "sm501");
1640         if (sm->regs_claim == NULL) {
1641                 dev_err(&dev->dev, "cannot claim registers\n");
1642                 err= -EBUSY;
1643                 goto err3;
1644         }
1645
1646         sm->regs = pci_ioremap_bar(dev, 1);
1647
1648         if (sm->regs == NULL) {
1649                 dev_err(&dev->dev, "cannot remap registers\n");
1650                 err = -EIO;
1651                 goto err4;
1652         }
1653
1654         sm501_init_dev(sm);
1655         return 0;
1656
1657  err4:
1658         release_resource(sm->regs_claim);
1659         kfree(sm->regs_claim);
1660  err3:
1661         pci_disable_device(dev);
1662  err2:
1663         kfree(sm);
1664  err1:
1665         return err;
1666 }
1667
1668 static void sm501_remove_sub(struct sm501_devdata *sm,
1669                              struct sm501_device *smdev)
1670 {
1671         list_del(&smdev->list);
1672         platform_device_unregister(&smdev->pdev);
1673 }
1674
1675 static void sm501_dev_remove(struct sm501_devdata *sm)
1676 {
1677         struct sm501_device *smdev, *tmp;
1678
1679         list_for_each_entry_safe(smdev, tmp, &sm->devices, list)
1680                 sm501_remove_sub(sm, smdev);
1681
1682         device_remove_file(sm->dev, &dev_attr_dbg_regs);
1683
1684         sm501_gpio_remove(sm);
1685 }
1686
1687 static void sm501_pci_remove(struct pci_dev *dev)
1688 {
1689         struct sm501_devdata *sm = pci_get_drvdata(dev);
1690
1691         sm501_dev_remove(sm);
1692         iounmap(sm->regs);
1693
1694         release_resource(sm->regs_claim);
1695         kfree(sm->regs_claim);
1696
1697         pci_disable_device(dev);
1698 }
1699
1700 static int sm501_plat_remove(struct platform_device *dev)
1701 {
1702         struct sm501_devdata *sm = platform_get_drvdata(dev);
1703
1704         sm501_dev_remove(sm);
1705         iounmap(sm->regs);
1706
1707         release_resource(sm->regs_claim);
1708         kfree(sm->regs_claim);
1709
1710         return 0;
1711 }
1712
1713 static DEFINE_PCI_DEVICE_TABLE(sm501_pci_tbl) = {
1714         { 0x126f, 0x0501, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
1715         { 0, },
1716 };
1717
1718 MODULE_DEVICE_TABLE(pci, sm501_pci_tbl);
1719
1720 static struct pci_driver sm501_pci_driver = {
1721         .name           = "sm501",
1722         .id_table       = sm501_pci_tbl,
1723         .probe          = sm501_pci_probe,
1724         .remove         = sm501_pci_remove,
1725 };
1726
1727 MODULE_ALIAS("platform:sm501");
1728
1729 static struct of_device_id of_sm501_match_tbl[] = {
1730         { .compatible = "smi,sm501", },
1731         { /* end */ }
1732 };
1733
1734 static struct platform_driver sm501_plat_driver = {
1735         .driver         = {
1736                 .name   = "sm501",
1737                 .owner  = THIS_MODULE,
1738                 .of_match_table = of_sm501_match_tbl,
1739         },
1740         .probe          = sm501_plat_probe,
1741         .remove         = sm501_plat_remove,
1742         .suspend        = sm501_plat_suspend,
1743         .resume         = sm501_plat_resume,
1744 };
1745
1746 static int __init sm501_base_init(void)
1747 {
1748         platform_driver_register(&sm501_plat_driver);
1749         return pci_register_driver(&sm501_pci_driver);
1750 }
1751
1752 static void __exit sm501_base_exit(void)
1753 {
1754         platform_driver_unregister(&sm501_plat_driver);
1755         pci_unregister_driver(&sm501_pci_driver);
1756 }
1757
1758 module_init(sm501_base_init);
1759 module_exit(sm501_base_exit);
1760
1761 MODULE_DESCRIPTION("SM501 Core Driver");
1762 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>, Vincent Sanders");
1763 MODULE_LICENSE("GPL v2");