arch/arm/plat-omap/clock.c

   1 /*
   2  *  linux/arch/arm/plat-omap/clock.c
   3  *
   4  *  Copyright (C) 2004 Nokia corporation
   5  *  Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>
   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 #include <linux/module.h>
  12 #include <linux/kernel.h>
  13 #include <linux/list.h>
  14 #include <linux/errno.h>
  15 #include <linux/err.h>
  16
  17 #include <asm/io.h>
  18 #include <asm/semaphore.h>
  19 #include <asm/hardware/clock.h>
  20 #include <asm/arch/board.h>
  21 #include <asm/arch/usb.h>
  22
  23 #include "clock.h"
  24
  25 static LIST_HEAD(clocks);
  26 static DECLARE_MUTEX(clocks_sem);
  27 static DEFINE_SPINLOCK(clockfw_lock);
  28 static void propagate_rate(struct clk *  clk);
  29 /* UART clock function */
  30 static int set_uart_rate(struct clk * clk, unsigned long rate);
  31 /* External clock (MCLK & BCLK) functions */
  32 static int set_ext_clk_rate(struct clk *  clk, unsigned long rate);
  33 static long round_ext_clk_rate(struct clk *  clk, unsigned long rate);
  34 static void init_ext_clk(struct clk *  clk);
  35 /* MPU virtual clock functions */
  36 static int select_table_rate(struct clk *  clk, unsigned long rate);
  37 static long round_to_table_rate(struct clk *  clk, unsigned long rate);
  38 void clk_setdpll(__u16, __u16);
  39
  40 static struct mpu_rate rate_table[] = {
  41         /* MPU MHz, xtal MHz, dpll1 MHz, CKCTL, DPLL_CTL
  42          * armdiv, dspdiv, dspmmu, tcdiv, perdiv, lcddiv
  43          */
  44 #if defined(CONFIG_OMAP_ARM_216MHZ)
  45         { 216000000, 12000000, 216000000, 0x050d, 0x2910 }, /* 1/1/2/2/2/8 */
  46 #endif
  47 #if defined(CONFIG_OMAP_ARM_195MHZ)
  48         { 195000000, 13000000, 195000000, 0x050e, 0x2790 }, /* 1/1/2/2/4/8 */
  49 #endif
  50 #if defined(CONFIG_OMAP_ARM_192MHZ)
  51         { 192000000, 19200000, 192000000, 0x050f, 0x2510 }, /* 1/1/2/2/8/8 */
  52         { 192000000, 12000000, 192000000, 0x050f, 0x2810 }, /* 1/1/2/2/8/8 */
  53         {  96000000, 12000000, 192000000, 0x055f, 0x2810 }, /* 2/2/2/2/8/8 */
  54         {  48000000, 12000000, 192000000, 0x0baf, 0x2810 }, /* 4/8/4/4/8/8 */
  55         {  24000000, 12000000, 192000000, 0x0fff, 0x2810 }, /* 8/8/8/8/8/8 */
  56 #endif
  57 #if defined(CONFIG_OMAP_ARM_182MHZ)
  58         { 182000000, 13000000, 182000000, 0x050e, 0x2710 }, /* 1/1/2/2/4/8 */
  59 #endif
  60 #if defined(CONFIG_OMAP_ARM_168MHZ)
  61         { 168000000, 12000000, 168000000, 0x010f, 0x2710 }, /* 1/1/1/2/8/8 */
  62 #endif
  63 #if defined(CONFIG_OMAP_ARM_150MHZ)
  64         { 150000000, 12000000, 150000000, 0x010a, 0x2cb0 }, /* 1/1/1/2/4/4 */
  65 #endif
  66 #if defined(CONFIG_OMAP_ARM_120MHZ)
  67         { 120000000, 12000000, 120000000, 0x010a, 0x2510 }, /* 1/1/1/2/4/4 */
  68 #endif
  69 #if defined(CONFIG_OMAP_ARM_96MHZ)
  70         {  96000000, 12000000,  96000000, 0x0005, 0x2410 }, /* 1/1/1/1/2/2 */
  71 #endif
  72 #if defined(CONFIG_OMAP_ARM_60MHZ)
  73         {  60000000, 12000000,  60000000, 0x0005, 0x2290 }, /* 1/1/1/1/2/2 */
  74 #endif
  75 #if defined(CONFIG_OMAP_ARM_30MHZ)
  76         {  30000000, 12000000,  60000000, 0x0555, 0x2290 }, /* 2/2/2/2/2/2 */
  77 #endif
  78         { 0, 0, 0, 0, 0 },
  79 };
  80
  81
  82 static void ckctl_recalc(struct clk *  clk);
  83 int __clk_enable(struct clk *clk);
  84 void __clk_disable(struct clk *clk);
  85 void __clk_unuse(struct clk *clk);
  86 int __clk_use(struct clk *clk);
  87
  88
  89 static void followparent_recalc(struct clk *  clk)
  90 {
  91         clk->rate = clk->parent->rate;
  92 }
  93
  94
  95 static void watchdog_recalc(struct clk *  clk)
  96 {
  97         clk->rate = clk->parent->rate / 14;
  98 }
  99
 100 static void uart_recalc(struct clk * clk)
 101 {
 102         unsigned int val = omap_readl(clk->enable_reg);
 103         if (val & clk->enable_bit)
 104                 clk->rate = 48000000;
 105         else
 106                 clk->rate = 12000000;
 107 }
 108
 109 static struct clk ck_ref = {
 110         .name           = "ck_ref",
 111         .rate           = 12000000,
 112         .flags          = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
 113                           ALWAYS_ENABLED,
 114 };
 115
 116 static struct clk ck_dpll1 = {
 117         .name           = "ck_dpll1",
 118         .parent         = &ck_ref,
 119         .flags          = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
 120                           RATE_PROPAGATES | ALWAYS_ENABLED,
 121 };
 122
 123 static struct clk ck_dpll1out = {
 124         .name           = "ck_dpll1out",
 125         .parent         = &ck_dpll1,
 126         .flags          = CLOCK_IN_OMAP16XX,
 127         .enable_reg     = ARM_IDLECT2,
 128         .enable_bit     = EN_CKOUT_ARM,
 129         .recalc         = &followparent_recalc,
 130 };
 131
 132 static struct clk arm_ck = {
 133         .name           = "arm_ck",
 134         .parent         = &ck_dpll1,
 135         .flags          = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
 136                           RATE_CKCTL | RATE_PROPAGATES | ALWAYS_ENABLED,
 137         .rate_offset    = CKCTL_ARMDIV_OFFSET,
 138         .recalc         = &ckctl_recalc,
 139 };
 140
 141 static struct clk armper_ck = {
 142         .name           = "armper_ck",
 143         .parent         = &ck_dpll1,
 144         .flags          = CLOCK_IN_OMAP730 | CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
 145                           RATE_CKCTL,
 146         .enable_reg     = ARM_IDLECT2,
 147         .enable_bit     = EN_PERCK,
 148         .rate_offset    = CKCTL_PERDIV_OFFSET,
 149         .recalc         = &ckctl_recalc,
 150 };
 151
 152 static struct clk arm_gpio_ck = {
 153         .name           = "arm_gpio_ck",
 154         .parent         = &ck_dpll1,
 155         .flags          = CLOCK_IN_OMAP1510,
 156         .enable_reg     = ARM_IDLECT2,
 157         .enable_bit     = EN_GPIOCK,
 158         .recalc         = &followparent_recalc,
 159 };
 160
 161 static struct clk armxor_ck = {
 162         .name           = "armxor_ck",
 163         .parent         = &ck_ref,
 164         .flags          = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX,
 165         .enable_reg     = ARM_IDLECT2,
 166         .enable_bit     = EN_XORPCK,
 167         .recalc         = &followparent_recalc,
 168 };
 169
 170 static struct clk armtim_ck = {
 171         .name           = "armtim_ck",
 172         .parent         = &ck_ref,
 173         .flags          = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX,
 174         .enable_reg     = ARM_IDLECT2,
 175         .enable_bit     = EN_TIMCK,
 176         .recalc         = &followparent_recalc,
 177 };
 178
 179 static struct clk armwdt_ck = {
 180         .name           = "armwdt_ck",
 181         .parent         = &ck_ref,
 182         .flags          = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX,
 183         .enable_reg     = ARM_IDLECT2,
 184         .enable_bit     = EN_WDTCK,
 185         .recalc         = &watchdog_recalc,
 186 };
 187
 188 static struct clk arminth_ck16xx = {
 189         .name           = "arminth_ck",
 190         .parent         = &arm_ck,
 191         .flags          = CLOCK_IN_OMAP16XX | ALWAYS_ENABLED,
 192         .recalc         = &followparent_recalc,
 193         /* Note: On 16xx the frequency can be divided by 2 by programming
 194          * ARM_CKCTL:ARM_INTHCK_SEL(14) to 1
 195          *
 196          * 1510 version is in TC clocks.
 197          */
 198 };
 199
 200 static struct clk dsp_ck = {
 201         .name           = "dsp_ck",
 202         .parent         = &ck_dpll1,
 203         .flags          = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
 204                           RATE_CKCTL,
 205         .enable_reg     = ARM_CKCTL,
 206         .enable_bit     = EN_DSPCK,
 207         .rate_offset    = CKCTL_DSPDIV_OFFSET,
 208         .recalc         = &ckctl_recalc,
 209 };
 210
 211 static struct clk dspmmu_ck = {
 212         .name           = "dspmmu_ck",
 213         .parent         = &ck_dpll1,
 214         .flags          = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
 215                           RATE_CKCTL | ALWAYS_ENABLED,
 216         .rate_offset    = CKCTL_DSPMMUDIV_OFFSET,
 217         .recalc         = &ckctl_recalc,
 218 };
 219
 220 static struct clk dspper_ck = {
 221         .name           = "dspper_ck",
 222         .parent         = &ck_dpll1,
 223         .flags          = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
 224                           RATE_CKCTL | DSP_DOMAIN_CLOCK | VIRTUAL_IO_ADDRESS,
 225         .enable_reg     = DSP_IDLECT2,
 226         .enable_bit     = EN_PERCK,
 227         .rate_offset    = CKCTL_PERDIV_OFFSET,
 228         .recalc         = &followparent_recalc,
 229         //.recalc               = &ckctl_recalc,
 230 };
 231
 232 static struct clk dspxor_ck = {
 233         .name           = "dspxor_ck",
 234         .parent         = &ck_ref,
 235         .flags          = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
 236                           DSP_DOMAIN_CLOCK | VIRTUAL_IO_ADDRESS,
 237         .enable_reg     = DSP_IDLECT2,
 238         .enable_bit     = EN_XORPCK,
 239         .recalc         = &followparent_recalc,
 240 };
 241
 242 static struct clk dsptim_ck = {
 243         .name           = "dsptim_ck",
 244         .parent         = &ck_ref,
 245         .flags          = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
 246                           DSP_DOMAIN_CLOCK | VIRTUAL_IO_ADDRESS,
 247         .enable_reg     = DSP_IDLECT2,
 248         .enable_bit     = EN_DSPTIMCK,
 249         .recalc         = &followparent_recalc,
 250 };
 251
 252 static struct clk tc_ck = {
 253         .name           = "tc_ck",
 254         .parent         = &ck_dpll1,
 255         .flags          = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX | CLOCK_IN_OMAP730 |
 256                           RATE_CKCTL | RATE_PROPAGATES | ALWAYS_ENABLED,
 257         .rate_offset    = CKCTL_TCDIV_OFFSET,
 258         .recalc         = &ckctl_recalc,
 259 };
 260
 261 static struct clk arminth_ck1510 = {
 262         .name           = "arminth_ck",
 263         .parent         = &tc_ck,
 264         .flags          = CLOCK_IN_OMAP1510 | ALWAYS_ENABLED,
 265         .recalc         = &followparent_recalc,
 266         /* Note: On 1510 the frequency follows TC_CK
 267          *
 268          * 16xx version is in MPU clocks.
 269          */
 270 };
 271
 272 static struct clk tipb_ck = {
 273         .name           = "tibp_ck",
 274         .parent         = &tc_ck,
 275         .flags          = CLOCK_IN_OMAP1510 | ALWAYS_ENABLED,
 276         .recalc         = &followparent_recalc,
 277 };
 278
 279 static struct clk l3_ocpi_ck = {
 280         .name           = "l3_ocpi_ck",
 281         .parent         = &tc_ck,
 282         .flags          = CLOCK_IN_OMAP16XX,
 283         .enable_reg     = ARM_IDLECT3,
 284         .enable_bit     = EN_OCPI_CK,
 285         .recalc         = &followparent_recalc,
 286 };
 287
 288 static struct clk tc1_ck = {
 289         .name           = "tc1_ck",
 290         .parent         = &tc_ck,
 291         .flags          = CLOCK_IN_OMAP16XX,
 292         .enable_reg     = ARM_IDLECT3,
 293         .enable_bit     = EN_TC1_CK,
 294         .recalc         = &followparent_recalc,
 295 };
 296
 297 static struct clk tc2_ck = {
 298         .name           = "tc2_ck",
 299         .parent         = &tc_ck,
 300         .flags          = CLOCK_IN_OMAP16XX,
 301         .enable_reg     = ARM_IDLECT3,
 302         .enable_bit     = EN_TC2_CK,
 303         .recalc         = &followparent_recalc,
 304 };
 305
 306 static struct clk dma_ck = {
 307         .name           = "dma_ck",
 308         .parent         = &tc_ck,
 309         .flags          = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
 310                           ALWAYS_ENABLED,
 311         .recalc         = &followparent_recalc,
 312 };
 313
 314 static struct clk dma_lcdfree_ck = {
 315         .name           = "dma_lcdfree_ck",
 316         .parent         = &tc_ck,
 317         .flags          = CLOCK_IN_OMAP16XX | ALWAYS_ENABLED,
 318         .recalc         = &followparent_recalc,
 319 };
 320
 321 static struct clk api_ck = {
 322         .name           = "api_ck",
 323         .parent         = &tc_ck,
 324         .flags          = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX,
 325         .enable_reg     = ARM_IDLECT2,
 326         .enable_bit     = EN_APICK,
 327         .recalc         = &followparent_recalc,
 328 };
 329
 330 static struct clk lb_ck = {
 331         .name           = "lb_ck",
 332         .parent         = &tc_ck,
 333         .flags          = CLOCK_IN_OMAP1510,
 334         .enable_reg     = ARM_IDLECT2,
 335         .enable_bit     = EN_LBCK,
 336         .recalc         = &followparent_recalc,
 337 };
 338
 339 static struct clk rhea1_ck = {
 340         .name           = "rhea1_ck",
 341         .parent         = &tc_ck,
 342         .flags          = CLOCK_IN_OMAP16XX | ALWAYS_ENABLED,
 343         .recalc         = &followparent_recalc,
 344 };
 345
 346 static struct clk rhea2_ck = {
 347         .name           = "rhea2_ck",
 348         .parent         = &tc_ck,
 349         .flags          = CLOCK_IN_OMAP16XX | ALWAYS_ENABLED,
 350         .recalc         = &followparent_recalc,
 351 };
 352
 353 static struct clk lcd_ck = {
 354         .name           = "lcd_ck",
 355         .parent         = &ck_dpll1,
 356         .flags          = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX | CLOCK_IN_OMAP730 |
 357                           RATE_CKCTL,
 358         .enable_reg     = ARM_IDLECT2,
 359         .enable_bit     = EN_LCDCK,
 360         .rate_offset    = CKCTL_LCDDIV_OFFSET,
 361         .recalc         = &ckctl_recalc,
 362 };
 363
 364 static struct clk uart1_1510 = {
 365         .name           = "uart1_ck",
 366         /* Direct from ULPD, no parent */
 367         .rate           = 12000000,
 368         .flags          = CLOCK_IN_OMAP1510 | ENABLE_REG_32BIT | ALWAYS_ENABLED,
 369         .enable_reg     = MOD_CONF_CTRL_0,
 370         .enable_bit     = 29,   /* Chooses between 12MHz and 48MHz */
 371         .set_rate       = &set_uart_rate,
 372         .recalc         = &uart_recalc,
 373 };
 374
 375 static struct clk uart1_16xx = {
 376         .name           = "uart1_ck",
 377         /* Direct from ULPD, no parent */
 378         .rate           = 48000000,
 379         .flags          = CLOCK_IN_OMAP16XX | RATE_FIXED | ENABLE_REG_32BIT,
 380         .enable_reg     = MOD_CONF_CTRL_0,
 381         .enable_bit     = 29,
 382 };
 383
 384 static struct clk uart2_ck = {
 385         .name           = "uart2_ck",
 386         /* Direct from ULPD, no parent */
 387         .rate           = 12000000,
 388         .flags          = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX | ENABLE_REG_32BIT,
 389         .enable_reg     = MOD_CONF_CTRL_0,
 390         .enable_bit     = 30,   /* Chooses between 12MHz and 48MHz */
 391         .set_rate       = &set_uart_rate,
 392         .recalc         = &uart_recalc,
 393 };
 394
 395 static struct clk uart3_1510 = {
 396         .name           = "uart3_ck",
 397         /* Direct from ULPD, no parent */
 398         .rate           = 12000000,
 399         .flags          = CLOCK_IN_OMAP1510 | ENABLE_REG_32BIT | ALWAYS_ENABLED,
 400         .enable_reg     = MOD_CONF_CTRL_0,
 401         .enable_bit     = 31,   /* Chooses between 12MHz and 48MHz */
 402         .set_rate       = &set_uart_rate,
 403         .recalc         = &uart_recalc,
 404 };
 405
 406 static struct clk uart3_16xx = {
 407         .name           = "uart3_ck",
 408         /* Direct from ULPD, no parent */
 409         .rate           = 48000000,
 410         .flags          = CLOCK_IN_OMAP16XX | RATE_FIXED | ENABLE_REG_32BIT,
 411         .enable_reg     = MOD_CONF_CTRL_0,
 412         .enable_bit     = 31,
 413 };
 414
 415 static struct clk usb_clko = {  /* 6 MHz output on W4_USB_CLKO */
 416         .name           = "usb_clko",
 417         /* Direct from ULPD, no parent */
 418         .rate           = 6000000,
 419         .flags          = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
 420                           RATE_FIXED | ENABLE_REG_32BIT,
 421         .enable_reg     = ULPD_CLOCK_CTRL,
 422         .enable_bit     = USB_MCLK_EN_BIT,
 423 };
 424
 425 static struct clk usb_hhc_ck1510 = {
 426         .name           = "usb_hhc_ck",
 427         /* Direct from ULPD, no parent */
 428         .rate           = 48000000, /* Actually 2 clocks, 12MHz and 48MHz */
 429         .flags          = CLOCK_IN_OMAP1510 |
 430                           RATE_FIXED | ENABLE_REG_32BIT,
 431         .enable_reg     = MOD_CONF_CTRL_0,
 432         .enable_bit     = USB_HOST_HHC_UHOST_EN,
 433 };
 434
 435 static struct clk usb_hhc_ck16xx = {
 436         .name           = "usb_hhc_ck",
 437         /* Direct from ULPD, no parent */
 438         .rate           = 48000000,
 439         /* OTG_SYSCON_2.OTG_PADEN == 0 (not 1510-compatible) */
 440         .flags          = CLOCK_IN_OMAP16XX |
 441                           RATE_FIXED | ENABLE_REG_32BIT,
 442         .enable_reg     = OTG_BASE + 0x08 /* OTG_SYSCON_2 */,
 443         .enable_bit     = 8 /* UHOST_EN */,
 444 };
 445
 446 static struct clk mclk_1510 = {
 447         .name           = "mclk",
 448         /* Direct from ULPD, no parent. May be enabled by ext hardware. */
 449         .rate           = 12000000,
 450         .flags          = CLOCK_IN_OMAP1510 | RATE_FIXED,
 451 };
 452
 453 static struct clk mclk_16xx = {
 454         .name           = "mclk",
 455         /* Direct from ULPD, no parent. May be enabled by ext hardware. */
 456         .flags          = CLOCK_IN_OMAP16XX,
 457         .enable_reg     = COM_CLK_DIV_CTRL_SEL,
 458         .enable_bit     = COM_ULPD_PLL_CLK_REQ,
 459         .set_rate       = &set_ext_clk_rate,
 460         .round_rate     = &round_ext_clk_rate,
 461         .init           = &init_ext_clk,
 462 };
 463
 464 static struct clk bclk_1510 = {
 465         .name           = "bclk",
 466         /* Direct from ULPD, no parent. May be enabled by ext hardware. */
 467         .rate           = 12000000,
 468         .flags          = CLOCK_IN_OMAP1510 | RATE_FIXED,
 469 };
 470
 471 static struct clk bclk_16xx = {
 472         .name           = "bclk",
 473         /* Direct from ULPD, no parent. May be enabled by ext hardware. */
 474         .flags          = CLOCK_IN_OMAP16XX,
 475         .enable_reg     = SWD_CLK_DIV_CTRL_SEL,
 476         .enable_bit     = SWD_ULPD_PLL_CLK_REQ,
 477         .set_rate       = &set_ext_clk_rate,
 478         .round_rate     = &round_ext_clk_rate,
 479         .init           = &init_ext_clk,
 480 };
 481
 482 static struct clk mmc1_ck = {
 483         .name           = "mmc1_ck",
 484         /* Functional clock is direct from ULPD, interface clock is ARMPER */
 485         .parent         = &armper_ck,
 486         .rate           = 48000000,
 487         .flags          = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
 488                           RATE_FIXED | ENABLE_REG_32BIT,
 489         .enable_reg     = MOD_CONF_CTRL_0,
 490         .enable_bit     = 23,
 491 };
 492
 493 static struct clk mmc2_ck = {
 494         .name           = "mmc2_ck",
 495         /* Functional clock is direct from ULPD, interface clock is ARMPER */
 496         .parent         = &armper_ck,
 497         .rate           = 48000000,
 498         .flags          = CLOCK_IN_OMAP16XX |
 499                           RATE_FIXED | ENABLE_REG_32BIT,
 500         .enable_reg     = MOD_CONF_CTRL_0,
 501         .enable_bit     = 20,
 502 };
 503
 504 static struct clk virtual_ck_mpu = {
 505         .name           = "mpu",
 506         .flags          = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
 507                           VIRTUAL_CLOCK | ALWAYS_ENABLED,
 508         .parent         = &arm_ck, /* Is smarter alias for */
 509         .recalc         = &followparent_recalc,
 510         .set_rate       = &select_table_rate,
 511         .round_rate     = &round_to_table_rate,
 512 };
 513
 514
 515 static struct clk *  onchip_clks[] = {
 516         /* non-ULPD clocks */
 517         &ck_ref,
 518         &ck_dpll1,
 519         /* CK_GEN1 clocks */
 520         &ck_dpll1out,
 521         &arm_ck,
 522         &armper_ck,
 523         &arm_gpio_ck,
 524         &armxor_ck,
 525         &armtim_ck,
 526         &armwdt_ck,
 527         &arminth_ck1510,  &arminth_ck16xx,
 528         /* CK_GEN2 clocks */
 529         &dsp_ck,
 530         &dspmmu_ck,
 531         &dspper_ck,
 532         &dspxor_ck,
 533         &dsptim_ck,
 534         /* CK_GEN3 clocks */
 535         &tc_ck,
 536         &tipb_ck,
 537         &l3_ocpi_ck,
 538         &tc1_ck,
 539         &tc2_ck,
 540         &dma_ck,
 541         &dma_lcdfree_ck,
 542         &api_ck,
 543         &lb_ck,
 544         &rhea1_ck,
 545         &rhea2_ck,
 546         &lcd_ck,
 547         /* ULPD clocks */
 548         &uart1_1510,
 549         &uart1_16xx,
 550         &uart2_ck,
 551         &uart3_1510,
 552         &uart3_16xx,
 553         &usb_clko,
 554         &usb_hhc_ck1510, &usb_hhc_ck16xx,
 555         &mclk_1510,  &mclk_16xx,
 556         &bclk_1510,  &bclk_16xx,
 557         &mmc1_ck,
 558         &mmc2_ck,
 559         /* Virtual clocks */
 560         &virtual_ck_mpu,
 561 };
 562
 563 struct clk *clk_get(struct device *dev, const char *id)
 564 {
 565         struct clk *p, *clk = ERR_PTR(-ENOENT);
 566
 567         down(&clocks_sem);
 568         list_for_each_entry(p, &clocks, node) {
 569                 if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
 570                         clk = p;
 571                         break;
 572                 }
 573         }
 574         up(&clocks_sem);
 575
 576         return clk;
 577 }
 578 EXPORT_SYMBOL(clk_get);
 579
 580
 581 void clk_put(struct clk *clk)
 582 {
 583         if (clk && !IS_ERR(clk))
 584                 module_put(clk->owner);
 585 }
 586 EXPORT_SYMBOL(clk_put);
 587
 588
 589 int __clk_enable(struct clk *clk)
 590 {
 591         __u16 regval16;
 592         __u32 regval32;
 593
 594         if (clk->flags & ALWAYS_ENABLED)
 595                 return 0;
 596
 597         if (unlikely(clk->enable_reg == 0)) {
 598                 printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
 599                        clk->name);
 600                 return 0;
 601         }
 602
 603         if (clk->flags & DSP_DOMAIN_CLOCK) {
 604                 __clk_use(&api_ck);
 605         }
 606
 607         if (clk->flags & ENABLE_REG_32BIT) {
 608                 if (clk->flags & VIRTUAL_IO_ADDRESS) {
 609                         regval32 = __raw_readl(clk->enable_reg);
 610                         regval32 |= (1 << clk->enable_bit);
 611                         __raw_writel(regval32, clk->enable_reg);
 612                 } else {
 613                         regval32 = omap_readl(clk->enable_reg);
 614                         regval32 |= (1 << clk->enable_bit);
 615                         omap_writel(regval32, clk->enable_reg);
 616                 }
 617         } else {
 618                 if (clk->flags & VIRTUAL_IO_ADDRESS) {
 619                         regval16 = __raw_readw(clk->enable_reg);
 620                         regval16 |= (1 << clk->enable_bit);
 621                         __raw_writew(regval16, clk->enable_reg);
 622                 } else {
 623                         regval16 = omap_readw(clk->enable_reg);
 624                         regval16 |= (1 << clk->enable_bit);
 625                         omap_writew(regval16, clk->enable_reg);
 626                 }
 627         }
 628
 629         if (clk->flags & DSP_DOMAIN_CLOCK) {
 630                 __clk_unuse(&api_ck);
 631         }
 632
 633         return 0;
 634 }
 635
 636
 637 void __clk_disable(struct clk *clk)
 638 {
 639         __u16 regval16;
 640         __u32 regval32;
 641
 642         if (clk->enable_reg == 0)
 643                 return;
 644
 645         if (clk->flags & DSP_DOMAIN_CLOCK) {
 646                 __clk_use(&api_ck);
 647         }
 648
 649         if (clk->flags & ENABLE_REG_32BIT) {
 650                 if (clk->flags & VIRTUAL_IO_ADDRESS) {
 651                         regval32 = __raw_readl(clk->enable_reg);
 652                         regval32 &= ~(1 << clk->enable_bit);
 653                         __raw_writel(regval32, clk->enable_reg);
 654                 } else {
 655                         regval32 = omap_readl(clk->enable_reg);
 656                         regval32 &= ~(1 << clk->enable_bit);
 657                         omap_writel(regval32, clk->enable_reg);
 658                 }
 659         } else {
 660                 if (clk->flags & VIRTUAL_IO_ADDRESS) {
 661                         regval16 = __raw_readw(clk->enable_reg);
 662                         regval16 &= ~(1 << clk->enable_bit);
 663                         __raw_writew(regval16, clk->enable_reg);
 664                 } else {
 665                         regval16 = omap_readw(clk->enable_reg);
 666                         regval16 &= ~(1 << clk->enable_bit);
 667                         omap_writew(regval16, clk->enable_reg);
 668                 }
 669         }
 670
 671         if (clk->flags & DSP_DOMAIN_CLOCK) {
 672                 __clk_unuse(&api_ck);
 673         }
 674 }
 675
 676
 677 void __clk_unuse(struct clk *clk)
 678 {
 679         if (clk->usecount > 0 && !(--clk->usecount)) {
 680                 __clk_disable(clk);
 681                 if (likely(clk->parent))
 682                         __clk_unuse(clk->parent);
 683         }
 684 }
 685
 686
 687 int __clk_use(struct clk *clk)
 688 {
 689         int ret = 0;
 690         if (clk->usecount++ == 0) {
 691                 if (likely(clk->parent))
 692                         ret = __clk_use(clk->parent);
 693
 694                 if (unlikely(ret != 0)) {
 695                         clk->usecount--;
 696                         return ret;
 697                 }
 698
 699                 ret = __clk_enable(clk);
 700
 701                 if (unlikely(ret != 0) && clk->parent) {
 702                         __clk_unuse(clk->parent);
 703                         clk->usecount--;
 704                 }
 705         }
 706
 707         return ret;
 708 }
 709
 710
 711 int clk_enable(struct clk *clk)
 712 {
 713         unsigned long flags;
 714         int ret;
 715
 716         spin_lock_irqsave(&clockfw_lock, flags);
 717         ret = __clk_enable(clk);
 718         spin_unlock_irqrestore(&clockfw_lock, flags);
 719         return ret;
 720 }
 721 EXPORT_SYMBOL(clk_enable);
 722
 723
 724 void clk_disable(struct clk *clk)
 725 {
 726         unsigned long flags;
 727
 728         spin_lock_irqsave(&clockfw_lock, flags);
 729         __clk_disable(clk);
 730         spin_unlock_irqrestore(&clockfw_lock, flags);
 731 }
 732 EXPORT_SYMBOL(clk_disable);
 733
 734
 735 int clk_use(struct clk *clk)
 736 {
 737         unsigned long flags;
 738         int ret = 0;
 739
 740         spin_lock_irqsave(&clockfw_lock, flags);
 741         ret = __clk_use(clk);
 742         spin_unlock_irqrestore(&clockfw_lock, flags);
 743         return ret;
 744 }
 745 EXPORT_SYMBOL(clk_use);
 746
 747
 748 void clk_unuse(struct clk *clk)
 749 {
 750         unsigned long flags;
 751
 752         spin_lock_irqsave(&clockfw_lock, flags);
 753         __clk_unuse(clk);
 754         spin_unlock_irqrestore(&clockfw_lock, flags);
 755 }
 756 EXPORT_SYMBOL(clk_unuse);
 757
 758
 759 int clk_get_usecount(struct clk *clk)
 760 {
 761         return clk->usecount;
 762 }
 763 EXPORT_SYMBOL(clk_get_usecount);
 764
 765
 766 unsigned long clk_get_rate(struct clk *clk)
 767 {
 768         return clk->rate;
 769 }
 770 EXPORT_SYMBOL(clk_get_rate);
 771
 772
 773 static __u16 verify_ckctl_value(__u16 newval)
 774 {
 775         /* This function checks for following limitations set
 776          * by the hardware (all conditions must be true):
 777          * DSPMMU_CK == DSP_CK  or  DSPMMU_CK == DSP_CK/2
 778          * ARM_CK >= TC_CK
 779          * DSP_CK >= TC_CK
 780          * DSPMMU_CK >= TC_CK
 781          *
 782          * In addition following rules are enforced:
 783          * LCD_CK <= TC_CK
 784          * ARMPER_CK <= TC_CK
 785          *
 786          * However, maximum frequencies are not checked for!
 787          */
 788         __u8 per_exp;
 789         __u8 lcd_exp;
 790         __u8 arm_exp;
 791         __u8 dsp_exp;
 792         __u8 tc_exp;
 793         __u8 dspmmu_exp;
 794
 795         per_exp = (newval >> CKCTL_PERDIV_OFFSET) & 3;
 796         lcd_exp = (newval >> CKCTL_LCDDIV_OFFSET) & 3;
 797         arm_exp = (newval >> CKCTL_ARMDIV_OFFSET) & 3;
 798         dsp_exp = (newval >> CKCTL_DSPDIV_OFFSET) & 3;
 799         tc_exp = (newval >> CKCTL_TCDIV_OFFSET) & 3;
 800         dspmmu_exp = (newval >> CKCTL_DSPMMUDIV_OFFSET) & 3;
 801
 802         if (dspmmu_exp < dsp_exp)
 803                 dspmmu_exp = dsp_exp;
 804         if (dspmmu_exp > dsp_exp+1)
 805                 dspmmu_exp = dsp_exp+1;
 806         if (tc_exp < arm_exp)
 807                 tc_exp = arm_exp;
 808         if (tc_exp < dspmmu_exp)
 809                 tc_exp = dspmmu_exp;
 810         if (tc_exp > lcd_exp)
 811                 lcd_exp = tc_exp;
 812         if (tc_exp > per_exp)
 813                 per_exp = tc_exp;
 814
 815         newval &= 0xf000;
 816         newval |= per_exp << CKCTL_PERDIV_OFFSET;
 817         newval |= lcd_exp << CKCTL_LCDDIV_OFFSET;
 818         newval |= arm_exp << CKCTL_ARMDIV_OFFSET;
 819         newval |= dsp_exp << CKCTL_DSPDIV_OFFSET;
 820         newval |= tc_exp << CKCTL_TCDIV_OFFSET;
 821         newval |= dspmmu_exp << CKCTL_DSPMMUDIV_OFFSET;
 822
 823         return newval;
 824 }
 825
 826
 827 static int calc_dsor_exp(struct clk *clk, unsigned long rate)
 828 {
 829         /* Note: If target frequency is too low, this function will return 4,
 830          * which is invalid value. Caller must check for this value and act
 831          * accordingly.
 832          *
 833          * Note: This function does not check for following limitations set
 834          * by the hardware (all conditions must be true):
 835          * DSPMMU_CK == DSP_CK  or  DSPMMU_CK == DSP_CK/2
 836          * ARM_CK >= TC_CK
 837          * DSP_CK >= TC_CK
 838          * DSPMMU_CK >= TC_CK
 839          */
 840         unsigned long realrate;
 841         struct clk *  parent;
 842         unsigned  dsor_exp;
 843
 844         if (unlikely(!(clk->flags & RATE_CKCTL)))
 845                 return -EINVAL;
 846
 847         parent = clk->parent;
 848         if (unlikely(parent == 0))
 849                 return -EIO;
 850
 851         realrate = parent->rate;
 852         for (dsor_exp=0; dsor_exp<4; dsor_exp++) {
 853                 if (realrate <= rate)
 854                         break;
 855
 856                 realrate /= 2;
 857         }
 858
 859         return dsor_exp;
 860 }
 861
 862
 863 static void ckctl_recalc(struct clk *  clk)
 864 {
 865         int dsor;
 866
 867         /* Calculate divisor encoded as 2-bit exponent */
 868         if (clk->flags & DSP_DOMAIN_CLOCK) {
 869                 /* The clock control bits are in DSP domain,
 870                  * so api_ck is needed for access.
 871                  * Note that DSP_CKCTL virt addr = phys addr, so
 872                  * we must use __raw_readw() instead of omap_readw().
 873                  */
 874                 __clk_use(&api_ck);
 875                 dsor = 1 << (3 & (__raw_readw(DSP_CKCTL) >> clk->rate_offset));
 876                 __clk_unuse(&api_ck);
 877         } else {
 878                 dsor = 1 << (3 & (omap_readw(ARM_CKCTL) >> clk->rate_offset));
 879         }
 880         if (unlikely(clk->rate == clk->parent->rate / dsor))
 881                 return; /* No change, quick exit */
 882         clk->rate = clk->parent->rate / dsor;
 883
 884         if (unlikely(clk->flags & RATE_PROPAGATES))
 885                 propagate_rate(clk);
 886 }
 887
 888
 889 long clk_round_rate(struct clk *clk, unsigned long rate)
 890 {
 891         int dsor_exp;
 892
 893         if (clk->flags & RATE_FIXED)
 894                 return clk->rate;
 895
 896         if (clk->flags & RATE_CKCTL) {
 897                 dsor_exp = calc_dsor_exp(clk, rate);
 898                 if (dsor_exp < 0)
 899                         return dsor_exp;
 900                 if (dsor_exp > 3)
 901                         dsor_exp = 3;
 902                 return clk->parent->rate / (1 << dsor_exp);
 903         }
 904
 905         if(clk->round_rate != 0)
 906                 return clk->round_rate(clk, rate);
 907
 908         return clk->rate;
 909 }
 910 EXPORT_SYMBOL(clk_round_rate);
 911
 912
 913 static void propagate_rate(struct clk *  clk)
 914 {
 915         struct clk **  clkp;
 916
 917         for (clkp = onchip_clks; clkp < onchip_clks+ARRAY_SIZE(onchip_clks); clkp++) {
 918                 if (likely((*clkp)->parent != clk)) continue;
 919                 if (likely((*clkp)->recalc))
 920                         (*clkp)->recalc(*clkp);
 921         }
 922 }
 923
 924
 925 static int select_table_rate(struct clk *  clk, unsigned long rate)
 926 {
 927         /* Find the highest supported frequency <= rate and switch to it */
 928         struct mpu_rate *  ptr;
 929
 930         if (clk != &virtual_ck_mpu)
 931                 return -EINVAL;
 932
 933         for (ptr = rate_table; ptr->rate; ptr++) {
 934                 if (ptr->xtal != ck_ref.rate)
 935                         continue;
 936
 937                 /* DPLL1 cannot be reprogrammed without risking system crash */
 938                 if (likely(ck_dpll1.rate!=0) && ptr->pll_rate != ck_dpll1.rate)
 939                         continue;
 940
 941                 /* Can check only after xtal frequency check */
 942                 if (ptr->rate <= rate)
 943                         break;
 944         }
 945
 946         if (!ptr->rate)
 947                 return -EINVAL;
 948
 949         if (!ptr->rate)
 950                 return -EINVAL;
 951
 952         if (unlikely(ck_dpll1.rate == 0)) {
 953                 omap_writew(ptr->dpllctl_val, DPLL_CTL);
 954                 ck_dpll1.rate = ptr->pll_rate;
 955         }
 956         omap_writew(ptr->ckctl_val, ARM_CKCTL);
 957         propagate_rate(&ck_dpll1);
 958         return 0;
 959 }
 960
 961
 962 static long round_to_table_rate(struct clk *  clk, unsigned long rate)
 963 {
 964         /* Find the highest supported frequency <= rate */
 965         struct mpu_rate *  ptr;
 966         long  highest_rate;
 967
 968         if (clk != &virtual_ck_mpu)
 969                 return -EINVAL;
 970
 971         highest_rate = -EINVAL;
 972
 973         for (ptr = rate_table; ptr->rate; ptr++) {
 974                 if (ptr->xtal != ck_ref.rate)
 975                         continue;
 976
 977                 highest_rate = ptr->rate;
 978
 979                 /* Can check only after xtal frequency check */
 980                 if (ptr->rate <= rate)
 981                         break;
 982         }
 983
 984         return highest_rate;
 985 }
 986
 987
 988 int clk_set_rate(struct clk *clk, unsigned long rate)
 989 {
 990         int  ret = -EINVAL;
 991         int  dsor_exp;
 992         __u16  regval;
 993         unsigned long  flags;
 994
 995         if (clk->flags & RATE_CKCTL) {
 996                 dsor_exp = calc_dsor_exp(clk, rate);
 997                 if (dsor_exp > 3)
 998                         dsor_exp = -EINVAL;
 999                 if (dsor_exp < 0)
1000                         return dsor_exp;
1001
1002                 spin_lock_irqsave(&clockfw_lock, flags);
1003                 regval = omap_readw(ARM_CKCTL);
1004                 regval &= ~(3 << clk->rate_offset);
1005                 regval |= dsor_exp << clk->rate_offset;
1006                 regval = verify_ckctl_value(regval);
1007                 omap_writew(regval, ARM_CKCTL);
1008                 clk->rate = clk->parent->rate / (1 << dsor_exp);
1009                 spin_unlock_irqrestore(&clockfw_lock, flags);
1010                 ret = 0;
1011         } else if(clk->set_rate != 0) {
1012                 spin_lock_irqsave(&clockfw_lock, flags);
1013                 ret = clk->set_rate(clk, rate);
1014                 spin_unlock_irqrestore(&clockfw_lock, flags);
1015         }
1016
1017         if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
1018                 propagate_rate(clk);
1019
1020         return ret;
1021 }
1022 EXPORT_SYMBOL(clk_set_rate);
1023
1024
1025 static unsigned calc_ext_dsor(unsigned long rate)
1026 {
1027         unsigned dsor;
1028
1029         /* MCLK and BCLK divisor selection is not linear:
1030          * freq = 96MHz / dsor
1031          *
1032          * RATIO_SEL range: dsor <-> RATIO_SEL
1033          * 0..6: (RATIO_SEL+2) <-> (dsor-2)
1034          * 6..48:  (8+(RATIO_SEL-6)*2) <-> ((dsor-8)/2+6)
1035          * Minimum dsor is 2 and maximum is 96. Odd divisors starting from 9
1036          * can not be used.
1037          */
1038         for (dsor = 2; dsor < 96; ++dsor) {
1039                 if ((dsor & 1) && dsor > 8)
1040                         continue;
1041                 if (rate >= 96000000 / dsor)
1042                         break;
1043         }
1044         return dsor;
1045 }
1046
1047 /* Only needed on 1510 */
1048 static int set_uart_rate(struct clk * clk, unsigned long rate)
1049 {
1050         unsigned int val;
1051
1052         val = omap_readl(clk->enable_reg);
1053         if (rate == 12000000)
1054                 val &= ~(1 << clk->enable_bit);
1055         else if (rate == 48000000)
1056                 val |= (1 << clk->enable_bit);
1057         else
1058                 return -EINVAL;
1059         omap_writel(val, clk->enable_reg);
1060         clk->rate = rate;
1061
1062         return 0;
1063 }
1064
1065 static int set_ext_clk_rate(struct clk *  clk, unsigned long rate)
1066 {
1067         unsigned dsor;
1068         __u16 ratio_bits;
1069
1070         dsor = calc_ext_dsor(rate);
1071         clk->rate = 96000000 / dsor;
1072         if (dsor > 8)
1073                 ratio_bits = ((dsor - 8) / 2 + 6) << 2;
1074         else
1075                 ratio_bits = (dsor - 2) << 2;
1076
1077         ratio_bits |= omap_readw(clk->enable_reg) & ~0xfd;
1078         omap_writew(ratio_bits, clk->enable_reg);
1079
1080         return 0;
1081 }
1082
1083
1084 static long round_ext_clk_rate(struct clk *  clk, unsigned long rate)
1085 {
1086         return 96000000 / calc_ext_dsor(rate);
1087 }
1088
1089
1090 static void init_ext_clk(struct clk *  clk)
1091 {
1092         unsigned dsor;
1093         __u16 ratio_bits;
1094
1095         /* Determine current rate and ensure clock is based on 96MHz APLL */
1096         ratio_bits = omap_readw(clk->enable_reg) & ~1;
1097         omap_writew(ratio_bits, clk->enable_reg);
1098
1099         ratio_bits = (ratio_bits & 0xfc) >> 2;
1100         if (ratio_bits > 6)
1101                 dsor = (ratio_bits - 6) * 2 + 8;
1102         else
1103                 dsor = ratio_bits + 2;
1104
1105         clk-> rate = 96000000 / dsor;
1106 }
1107
1108
1109 int clk_register(struct clk *clk)
1110 {
1111         down(&clocks_sem);
1112         list_add(&clk->node, &clocks);
1113         if (clk->init)
1114                 clk->init(clk);
1115         up(&clocks_sem);
1116         return 0;
1117 }
1118 EXPORT_SYMBOL(clk_register);
1119
1120 void clk_unregister(struct clk *clk)
1121 {
1122         down(&clocks_sem);
1123         list_del(&clk->node);
1124         up(&clocks_sem);
1125 }
1126 EXPORT_SYMBOL(clk_unregister);
1127
1128 #ifdef CONFIG_OMAP_RESET_CLOCKS
1129 /*
1130  * Resets some clocks that may be left on from bootloader,
1131  * but leaves serial clocks on. See also omap_late_clk_reset().
1132  */
1133 static inline void omap_early_clk_reset(void)
1134 {
1135         //omap_writel(0x3 << 29, MOD_CONF_CTRL_0);
1136 }
1137 #else
1138 #define omap_early_clk_reset()  {}
1139 #endif
1140
1141 int __init clk_init(void)
1142 {
1143         struct clk **  clkp;
1144         const struct omap_clock_config *info;
1145         int crystal_type = 0; /* Default 12 MHz */
1146
1147         omap_early_clk_reset();
1148
1149         for (clkp = onchip_clks; clkp < onchip_clks+ARRAY_SIZE(onchip_clks); clkp++) {
1150                 if (((*clkp)->flags &CLOCK_IN_OMAP1510) && cpu_is_omap1510()) {
1151                         clk_register(*clkp);
1152                         continue;
1153                 }
1154
1155                 if (((*clkp)->flags &CLOCK_IN_OMAP16XX) && cpu_is_omap16xx()) {
1156                         clk_register(*clkp);
1157                         continue;
1158                 }
1159
1160                 if (((*clkp)->flags &CLOCK_IN_OMAP730) && cpu_is_omap730()) {
1161                         clk_register(*clkp);
1162                         continue;
1163                 }
1164         }
1165
1166         info = omap_get_config(OMAP_TAG_CLOCK, struct omap_clock_config);
1167         if (info != NULL) {
1168                 if (!cpu_is_omap1510())
1169                         crystal_type = info->system_clock_type;
1170         }
1171
1172 #if defined(CONFIG_ARCH_OMAP730)
1173         ck_ref.rate = 13000000;
1174 #elif defined(CONFIG_ARCH_OMAP16XX)
1175         if (crystal_type == 2)
1176                 ck_ref.rate = 19200000;
1177 #endif
1178
1179         printk("Clocks: ARM_SYSST: 0x%04x DPLL_CTL: 0x%04x ARM_CKCTL: 0x%04x\n",
1180                omap_readw(ARM_SYSST), omap_readw(DPLL_CTL),
1181                omap_readw(ARM_CKCTL));
1182
1183         /* We want to be in syncronous scalable mode */
1184         omap_writew(0x1000, ARM_SYSST);
1185
1186 #ifdef CONFIG_OMAP_CLOCKS_SET_BY_BOOTLOADER
1187         /* Use values set by bootloader. Determine PLL rate and recalculate
1188          * dependent clocks as if kernel had changed PLL or divisors.
1189          */
1190         {
1191                 unsigned pll_ctl_val = omap_readw(DPLL_CTL);
1192
1193                 ck_dpll1.rate = ck_ref.rate; /* Base xtal rate */
1194                 if (pll_ctl_val & 0x10) {
1195                         /* PLL enabled, apply multiplier and divisor */
1196                         if (pll_ctl_val & 0xf80)
1197                                 ck_dpll1.rate *= (pll_ctl_val & 0xf80) >> 7;
1198                         ck_dpll1.rate /= ((pll_ctl_val & 0x60) >> 5) + 1;
1199                 } else {
1200                         /* PLL disabled, apply bypass divisor */
1201                         switch (pll_ctl_val & 0xc) {
1202                         case 0:
1203                                 break;
1204                         case 0x4:
1205                                 ck_dpll1.rate /= 2;
1206                                 break;
1207                         default:
1208                                 ck_dpll1.rate /= 4;
1209                                 break;
1210                         }
1211                 }
1212         }
1213         propagate_rate(&ck_dpll1);
1214 #else
1215         /* Find the highest supported frequency and enable it */
1216         if (select_table_rate(&virtual_ck_mpu, ~0)) {
1217                 printk(KERN_ERR "System frequencies not set. Check your config.\n");
1218                 /* Guess sane values (60MHz) */
1219                 omap_writew(0x2290, DPLL_CTL);
1220                 omap_writew(0x1005, ARM_CKCTL);
1221                 ck_dpll1.rate = 60000000;
1222                 propagate_rate(&ck_dpll1);
1223         }
1224 #endif
1225         /* Cache rates for clocks connected to ck_ref (not dpll1) */
1226         propagate_rate(&ck_ref);
1227         printk(KERN_INFO "Clocking rate (xtal/DPLL1/MPU): %ld.%01ld/%ld/%ld MHz\n",
1228                ck_ref.rate / 1000000, (ck_ref.rate / 100000) % 10,
1229                ck_dpll1.rate, arm_ck.rate);
1230
1231 #ifdef CONFIG_MACH_OMAP_PERSEUS2
1232         /* Select slicer output as OMAP input clock */
1233         omap_writew(omap_readw(OMAP730_PCC_UPLD_CTRL) & ~0x1, OMAP730_PCC_UPLD_CTRL);
1234 #endif
1235
1236         /* Turn off DSP and ARM_TIMXO. Make sure ARM_INTHCK is not divided */
1237         omap_writew(omap_readw(ARM_CKCTL) & 0x0fff, ARM_CKCTL);
1238
1239         /* Put DSP/MPUI into reset until needed */
1240         omap_writew(0, ARM_RSTCT1);
1241         omap_writew(1, ARM_RSTCT2);
1242         omap_writew(0x400, ARM_IDLECT1);
1243
1244         /*
1245          * According to OMAP5910 Erratum SYS_DMA_1, bit DMACK_REQ (bit 8)
1246          * of the ARM_IDLECT2 register must be set to zero. The power-on
1247          * default value of this bit is one.
1248          */
1249         omap_writew(0x0000, ARM_IDLECT2);       /* Turn LCD clock off also */
1250
1251         /*
1252          * Only enable those clocks we will need, let the drivers
1253          * enable other clocks as necessary
1254          */
1255         clk_use(&armper_ck);
1256         clk_use(&armxor_ck);
1257         clk_use(&armtim_ck);
1258
1259         if (cpu_is_omap1510())
1260                 clk_enable(&arm_gpio_ck);
1261
1262         return 0;
1263 }
1264
1265
1266 #ifdef CONFIG_OMAP_RESET_CLOCKS
1267
1268 static int __init omap_late_clk_reset(void)
1269 {
1270         /* Turn off all unused clocks */
1271         struct clk *p;
1272         __u32 regval32;
1273
1274         omap_writew(0, SOFT_REQ_REG);
1275         omap_writew(0, SOFT_REQ_REG2);
1276
1277         list_for_each_entry(p, &clocks, node) {
1278                 if (p->usecount > 0 || (p->flags & ALWAYS_ENABLED) ||
1279                         p->enable_reg == 0)
1280                         continue;
1281
1282                 /* Assume no DSP clocks have been activated by bootloader */
1283                 if (p->flags & DSP_DOMAIN_CLOCK)
1284                         continue;
1285
1286                 /* Is the clock already disabled? */
1287                 if (p->flags & ENABLE_REG_32BIT) {
1288                         if (p->flags & VIRTUAL_IO_ADDRESS)
1289                                 regval32 = __raw_readl(p->enable_reg);
1290                         else
1291                                 regval32 = omap_readl(p->enable_reg);
1292                 } else {
1293                         if (p->flags & VIRTUAL_IO_ADDRESS)
1294                                 regval32 = __raw_readw(p->enable_reg);
1295                         else
1296                                 regval32 = omap_readw(p->enable_reg);
1297                 }
1298
1299                 if ((regval32 & (1 << p->enable_bit)) == 0)
1300                         continue;
1301
1302                 /* FIXME: This clock seems to be necessary but no-one
1303                  * has asked for its activation. */
1304                 if (p == &tc2_ck         // FIX: pm.c (SRAM), CCP, Camera
1305                     || p == &ck_dpll1out // FIX: SoSSI, SSR
1306                     || p == &arm_gpio_ck // FIX: GPIO code for 1510
1307                     ) {
1308                         printk(KERN_INFO "FIXME: Clock \"%s\" seems unused\n",
1309                                p->name);
1310                         continue;
1311                 }
1312
1313                 printk(KERN_INFO "Disabling unused clock \"%s\"... ", p->name);
1314                 __clk_disable(p);
1315                 printk(" done\n");
1316         }
1317
1318         return 0;
1319 }
1320
1321 late_initcall(omap_late_clk_reset);
1322
1323 #endif