drivers/cpufreq/s5pv210-cpufreq.c

   1 /*
   2  * Copyright (c) 2010 Samsung Electronics Co., Ltd.
   3  *              http://www.samsung.com
   4  *
   5  * CPU frequency scaling for S5PC110/S5PV210
   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
  12 #include <linux/types.h>
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/err.h>
  16 #include <linux/clk.h>
  17 #include <linux/io.h>
  18 #include <linux/cpufreq.h>
  19 #include <linux/reboot.h>
  20 #include <linux/regulator/consumer.h>
  21 #include <linux/suspend.h>
  22
  23 #include <mach/map.h>
  24 #include <mach/regs-clock.h>
  25
  26 static struct clk *cpu_clk;
  27 static struct clk *dmc0_clk;
  28 static struct clk *dmc1_clk;
  29 static struct cpufreq_freqs freqs;
  30 static DEFINE_MUTEX(set_freq_lock);
  31
  32 /* APLL M,P,S values for 1G/800Mhz */
  33 #define APLL_VAL_1000   ((1 << 31) | (125 << 16) | (3 << 8) | 1)
  34 #define APLL_VAL_800    ((1 << 31) | (100 << 16) | (3 << 8) | 1)
  35
  36 /* Use 800MHz when entering sleep mode */
  37 #define SLEEP_FREQ      (800 * 1000)
  38
  39 /*
  40  * relation has an additional symantics other than the standard of cpufreq
  41  * DISALBE_FURTHER_CPUFREQ: disable further access to target
  42  * ENABLE_FURTUER_CPUFREQ: enable access to target
  43  */
  44 enum cpufreq_access {
  45         DISABLE_FURTHER_CPUFREQ = 0x10,
  46         ENABLE_FURTHER_CPUFREQ = 0x20,
  47 };
  48
  49 static bool no_cpufreq_access;
  50
  51 /*
  52  * DRAM configurations to calculate refresh counter for changing
  53  * frequency of memory.
  54  */
  55 struct dram_conf {
  56         unsigned long freq;     /* HZ */
  57         unsigned long refresh;  /* DRAM refresh counter * 1000 */
  58 };
  59
  60 /* DRAM configuration (DMC0 and DMC1) */
  61 static struct dram_conf s5pv210_dram_conf[2];
  62
  63 enum perf_level {
  64         L0, L1, L2, L3, L4,
  65 };
  66
  67 enum s5pv210_mem_type {
  68         LPDDR   = 0x1,
  69         LPDDR2  = 0x2,
  70         DDR2    = 0x4,
  71 };
  72
  73 enum s5pv210_dmc_port {
  74         DMC0 = 0,
  75         DMC1,
  76 };
  77
  78 static struct cpufreq_frequency_table s5pv210_freq_table[] = {
  79         {L0, 1000*1000},
  80         {L1, 800*1000},
  81         {L2, 400*1000},
  82         {L3, 200*1000},
  83         {L4, 100*1000},
  84         {0, CPUFREQ_TABLE_END},
  85 };
  86
  87 static struct regulator *arm_regulator;
  88 static struct regulator *int_regulator;
  89
  90 struct s5pv210_dvs_conf {
  91         int arm_volt;   /* uV */
  92         int int_volt;   /* uV */
  93 };
  94
  95 static const int arm_volt_max = 1350000;
  96 static const int int_volt_max = 1250000;
  97
  98 static struct s5pv210_dvs_conf dvs_conf[] = {
  99         [L0] = {
 100                 .arm_volt       = 1250000,
 101                 .int_volt       = 1100000,
 102         },
 103         [L1] = {
 104                 .arm_volt       = 1200000,
 105                 .int_volt       = 1100000,
 106         },
 107         [L2] = {
 108                 .arm_volt       = 1050000,
 109                 .int_volt       = 1100000,
 110         },
 111         [L3] = {
 112                 .arm_volt       = 950000,
 113                 .int_volt       = 1100000,
 114         },
 115         [L4] = {
 116                 .arm_volt       = 950000,
 117                 .int_volt       = 1000000,
 118         },
 119 };
 120
 121 static u32 clkdiv_val[5][11] = {
 122         /*
 123          * Clock divider value for following
 124          * { APLL, A2M, HCLK_MSYS, PCLK_MSYS,
 125          *   HCLK_DSYS, PCLK_DSYS, HCLK_PSYS, PCLK_PSYS,
 126          *   ONEDRAM, MFC, G3D }
 127          */
 128
 129         /* L0 : [1000/200/100][166/83][133/66][200/200] */
 130         {0, 4, 4, 1, 3, 1, 4, 1, 3, 0, 0},
 131
 132         /* L1 : [800/200/100][166/83][133/66][200/200] */
 133         {0, 3, 3, 1, 3, 1, 4, 1, 3, 0, 0},
 134
 135         /* L2 : [400/200/100][166/83][133/66][200/200] */
 136         {1, 3, 1, 1, 3, 1, 4, 1, 3, 0, 0},
 137
 138         /* L3 : [200/200/100][166/83][133/66][200/200] */
 139         {3, 3, 1, 1, 3, 1, 4, 1, 3, 0, 0},
 140
 141         /* L4 : [100/100/100][83/83][66/66][100/100] */
 142         {7, 7, 0, 0, 7, 0, 9, 0, 7, 0, 0},
 143 };
 144
 145 /*
 146  * This function set DRAM refresh counter
 147  * accoriding to operating frequency of DRAM
 148  * ch: DMC port number 0 or 1
 149  * freq: Operating frequency of DRAM(KHz)
 150  */
 151 static void s5pv210_set_refresh(enum s5pv210_dmc_port ch, unsigned long freq)
 152 {
 153         unsigned long tmp, tmp1;
 154         void __iomem *reg = NULL;
 155
 156         if (ch == DMC0) {
 157                 reg = (S5P_VA_DMC0 + 0x30);
 158         } else if (ch == DMC1) {
 159                 reg = (S5P_VA_DMC1 + 0x30);
 160         } else {
 161                 printk(KERN_ERR "Cannot find DMC port\n");
 162                 return;
 163         }
 164
 165         /* Find current DRAM frequency */
 166         tmp = s5pv210_dram_conf[ch].freq;
 167
 168         do_div(tmp, freq);
 169
 170         tmp1 = s5pv210_dram_conf[ch].refresh;
 171
 172         do_div(tmp1, tmp);
 173
 174         __raw_writel(tmp1, reg);
 175 }
 176
 177 static int s5pv210_verify_speed(struct cpufreq_policy *policy)
 178 {
 179         if (policy->cpu)
 180                 return -EINVAL;
 181
 182         return cpufreq_frequency_table_verify(policy, s5pv210_freq_table);
 183 }
 184
 185 static unsigned int s5pv210_getspeed(unsigned int cpu)
 186 {
 187         if (cpu)
 188                 return 0;
 189
 190         return clk_get_rate(cpu_clk) / 1000;
 191 }
 192
 193 static int s5pv210_target(struct cpufreq_policy *policy,
 194                           unsigned int target_freq,
 195                           unsigned int relation)
 196 {
 197         unsigned long reg;
 198         unsigned int index, priv_index;
 199         unsigned int pll_changing = 0;
 200         unsigned int bus_speed_changing = 0;
 201         int arm_volt, int_volt;
 202         int ret = 0;
 203
 204         mutex_lock(&set_freq_lock);
 205
 206         if (relation & ENABLE_FURTHER_CPUFREQ)
 207                 no_cpufreq_access = false;
 208
 209         if (no_cpufreq_access) {
 210 #ifdef CONFIG_PM_VERBOSE
 211                 pr_err("%s:%d denied access to %s as it is disabled"
 212                                 "temporarily\n", __FILE__, __LINE__, __func__);
 213 #endif
 214                 ret = -EINVAL;
 215                 goto exit;
 216         }
 217
 218         if (relation & DISABLE_FURTHER_CPUFREQ)
 219                 no_cpufreq_access = true;
 220
 221         relation &= ~(ENABLE_FURTHER_CPUFREQ | DISABLE_FURTHER_CPUFREQ);
 222
 223         freqs.old = s5pv210_getspeed(0);
 224
 225         if (cpufreq_frequency_table_target(policy, s5pv210_freq_table,
 226                                            target_freq, relation, &index)) {
 227                 ret = -EINVAL;
 228                 goto exit;
 229         }
 230
 231         freqs.new = s5pv210_freq_table[index].frequency;
 232
 233         if (freqs.new == freqs.old)
 234                 goto exit;
 235
 236         /* Finding current running level index */
 237         if (cpufreq_frequency_table_target(policy, s5pv210_freq_table,
 238                                            freqs.old, relation, &priv_index)) {
 239                 ret = -EINVAL;
 240                 goto exit;
 241         }
 242
 243         arm_volt = dvs_conf[index].arm_volt;
 244         int_volt = dvs_conf[index].int_volt;
 245
 246         if (freqs.new > freqs.old) {
 247                 ret = regulator_set_voltage(arm_regulator,
 248                                 arm_volt, arm_volt_max);
 249                 if (ret)
 250                         goto exit;
 251
 252                 ret = regulator_set_voltage(int_regulator,
 253                                 int_volt, int_volt_max);
 254                 if (ret)
 255                         goto exit;
 256         }
 257
 258         cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
 259
 260         /* Check if there need to change PLL */
 261         if ((index == L0) || (priv_index == L0))
 262                 pll_changing = 1;
 263
 264         /* Check if there need to change System bus clock */
 265         if ((index == L4) || (priv_index == L4))
 266                 bus_speed_changing = 1;
 267
 268         if (bus_speed_changing) {
 269                 /*
 270                  * Reconfigure DRAM refresh counter value for minimum
 271                  * temporary clock while changing divider.
 272                  * expected clock is 83Mhz : 7.8usec/(1/83Mhz) = 0x287
 273                  */
 274                 if (pll_changing)
 275                         s5pv210_set_refresh(DMC1, 83000);
 276                 else
 277                         s5pv210_set_refresh(DMC1, 100000);
 278
 279                 s5pv210_set_refresh(DMC0, 83000);
 280         }
 281
 282         /*
 283          * APLL should be changed in this level
 284          * APLL -> MPLL(for stable transition) -> APLL
 285          * Some clock source's clock API are not prepared.
 286          * Do not use clock API in below code.
 287          */
 288         if (pll_changing) {
 289                 /*
 290                  * 1. Temporary Change divider for MFC and G3D
 291                  * SCLKA2M(200/1=200)->(200/4=50)Mhz
 292                  */
 293                 reg = __raw_readl(S5P_CLK_DIV2);
 294                 reg &= ~(S5P_CLKDIV2_G3D_MASK | S5P_CLKDIV2_MFC_MASK);
 295                 reg |= (3 << S5P_CLKDIV2_G3D_SHIFT) |
 296                         (3 << S5P_CLKDIV2_MFC_SHIFT);
 297                 __raw_writel(reg, S5P_CLK_DIV2);
 298
 299                 /* For MFC, G3D dividing */
 300                 do {
 301                         reg = __raw_readl(S5P_CLKDIV_STAT0);
 302                 } while (reg & ((1 << 16) | (1 << 17)));
 303
 304                 /*
 305                  * 2. Change SCLKA2M(200Mhz)to SCLKMPLL in MFC_MUX, G3D MUX
 306                  * (200/4=50)->(667/4=166)Mhz
 307                  */
 308                 reg = __raw_readl(S5P_CLK_SRC2);
 309                 reg &= ~(S5P_CLKSRC2_G3D_MASK | S5P_CLKSRC2_MFC_MASK);
 310                 reg |= (1 << S5P_CLKSRC2_G3D_SHIFT) |
 311                         (1 << S5P_CLKSRC2_MFC_SHIFT);
 312                 __raw_writel(reg, S5P_CLK_SRC2);
 313
 314                 do {
 315                         reg = __raw_readl(S5P_CLKMUX_STAT1);
 316                 } while (reg & ((1 << 7) | (1 << 3)));
 317
 318                 /*
 319                  * 3. DMC1 refresh count for 133Mhz if (index == L4) is
 320                  * true refresh counter is already programed in upper
 321                  * code. 0x287@83Mhz
 322                  */
 323                 if (!bus_speed_changing)
 324                         s5pv210_set_refresh(DMC1, 133000);
 325
 326                 /* 4. SCLKAPLL -> SCLKMPLL */
 327                 reg = __raw_readl(S5P_CLK_SRC0);
 328                 reg &= ~(S5P_CLKSRC0_MUX200_MASK);
 329                 reg |= (0x1 << S5P_CLKSRC0_MUX200_SHIFT);
 330                 __raw_writel(reg, S5P_CLK_SRC0);
 331
 332                 do {
 333                         reg = __raw_readl(S5P_CLKMUX_STAT0);
 334                 } while (reg & (0x1 << 18));
 335
 336         }
 337
 338         /* Change divider */
 339         reg = __raw_readl(S5P_CLK_DIV0);
 340
 341         reg &= ~(S5P_CLKDIV0_APLL_MASK | S5P_CLKDIV0_A2M_MASK |
 342                 S5P_CLKDIV0_HCLK200_MASK | S5P_CLKDIV0_PCLK100_MASK |
 343                 S5P_CLKDIV0_HCLK166_MASK | S5P_CLKDIV0_PCLK83_MASK |
 344                 S5P_CLKDIV0_HCLK133_MASK | S5P_CLKDIV0_PCLK66_MASK);
 345
 346         reg |= ((clkdiv_val[index][0] << S5P_CLKDIV0_APLL_SHIFT) |
 347                 (clkdiv_val[index][1] << S5P_CLKDIV0_A2M_SHIFT) |
 348                 (clkdiv_val[index][2] << S5P_CLKDIV0_HCLK200_SHIFT) |
 349                 (clkdiv_val[index][3] << S5P_CLKDIV0_PCLK100_SHIFT) |
 350                 (clkdiv_val[index][4] << S5P_CLKDIV0_HCLK166_SHIFT) |
 351                 (clkdiv_val[index][5] << S5P_CLKDIV0_PCLK83_SHIFT) |
 352                 (clkdiv_val[index][6] << S5P_CLKDIV0_HCLK133_SHIFT) |
 353                 (clkdiv_val[index][7] << S5P_CLKDIV0_PCLK66_SHIFT));
 354
 355         __raw_writel(reg, S5P_CLK_DIV0);
 356
 357         do {
 358                 reg = __raw_readl(S5P_CLKDIV_STAT0);
 359         } while (reg & 0xff);
 360
 361         /* ARM MCS value changed */
 362         reg = __raw_readl(S5P_ARM_MCS_CON);
 363         reg &= ~0x3;
 364         if (index >= L3)
 365                 reg |= 0x3;
 366         else
 367                 reg |= 0x1;
 368
 369         __raw_writel(reg, S5P_ARM_MCS_CON);
 370
 371         if (pll_changing) {
 372                 /* 5. Set Lock time = 30us*24Mhz = 0x2cf */
 373                 __raw_writel(0x2cf, S5P_APLL_LOCK);
 374
 375                 /*
 376                  * 6. Turn on APLL
 377                  * 6-1. Set PMS values
 378                  * 6-2. Wait untile the PLL is locked
 379                  */
 380                 if (index == L0)
 381                         __raw_writel(APLL_VAL_1000, S5P_APLL_CON);
 382                 else
 383                         __raw_writel(APLL_VAL_800, S5P_APLL_CON);
 384
 385                 do {
 386                         reg = __raw_readl(S5P_APLL_CON);
 387                 } while (!(reg & (0x1 << 29)));
 388
 389                 /*
 390                  * 7. Change souce clock from SCLKMPLL(667Mhz)
 391                  * to SCLKA2M(200Mhz) in MFC_MUX and G3D MUX
 392                  * (667/4=166)->(200/4=50)Mhz
 393                  */
 394                 reg = __raw_readl(S5P_CLK_SRC2);
 395                 reg &= ~(S5P_CLKSRC2_G3D_MASK | S5P_CLKSRC2_MFC_MASK);
 396                 reg |= (0 << S5P_CLKSRC2_G3D_SHIFT) |
 397                         (0 << S5P_CLKSRC2_MFC_SHIFT);
 398                 __raw_writel(reg, S5P_CLK_SRC2);
 399
 400                 do {
 401                         reg = __raw_readl(S5P_CLKMUX_STAT1);
 402                 } while (reg & ((1 << 7) | (1 << 3)));
 403
 404                 /*
 405                  * 8. Change divider for MFC and G3D
 406                  * (200/4=50)->(200/1=200)Mhz
 407                  */
 408                 reg = __raw_readl(S5P_CLK_DIV2);
 409                 reg &= ~(S5P_CLKDIV2_G3D_MASK | S5P_CLKDIV2_MFC_MASK);
 410                 reg |= (clkdiv_val[index][10] << S5P_CLKDIV2_G3D_SHIFT) |
 411                         (clkdiv_val[index][9] << S5P_CLKDIV2_MFC_SHIFT);
 412                 __raw_writel(reg, S5P_CLK_DIV2);
 413
 414                 /* For MFC, G3D dividing */
 415                 do {
 416                         reg = __raw_readl(S5P_CLKDIV_STAT0);
 417                 } while (reg & ((1 << 16) | (1 << 17)));
 418
 419                 /* 9. Change MPLL to APLL in MSYS_MUX */
 420                 reg = __raw_readl(S5P_CLK_SRC0);
 421                 reg &= ~(S5P_CLKSRC0_MUX200_MASK);
 422                 reg |= (0x0 << S5P_CLKSRC0_MUX200_SHIFT);
 423                 __raw_writel(reg, S5P_CLK_SRC0);
 424
 425                 do {
 426                         reg = __raw_readl(S5P_CLKMUX_STAT0);
 427                 } while (reg & (0x1 << 18));
 428
 429                 /*
 430                  * 10. DMC1 refresh counter
 431                  * L4 : DMC1 = 100Mhz 7.8us/(1/100) = 0x30c
 432                  * Others : DMC1 = 200Mhz 7.8us/(1/200) = 0x618
 433                  */
 434                 if (!bus_speed_changing)
 435                         s5pv210_set_refresh(DMC1, 200000);
 436         }
 437
 438         /*
 439          * L4 level need to change memory bus speed, hence onedram clock divier
 440          * and memory refresh parameter should be changed
 441          */
 442         if (bus_speed_changing) {
 443                 reg = __raw_readl(S5P_CLK_DIV6);
 444                 reg &= ~S5P_CLKDIV6_ONEDRAM_MASK;
 445                 reg |= (clkdiv_val[index][8] << S5P_CLKDIV6_ONEDRAM_SHIFT);
 446                 __raw_writel(reg, S5P_CLK_DIV6);
 447
 448                 do {
 449                         reg = __raw_readl(S5P_CLKDIV_STAT1);
 450                 } while (reg & (1 << 15));
 451
 452                 /* Reconfigure DRAM refresh counter value */
 453                 if (index != L4) {
 454                         /*
 455                          * DMC0 : 166Mhz
 456                          * DMC1 : 200Mhz
 457                          */
 458                         s5pv210_set_refresh(DMC0, 166000);
 459                         s5pv210_set_refresh(DMC1, 200000);
 460                 } else {
 461                         /*
 462                          * DMC0 : 83Mhz
 463                          * DMC1 : 100Mhz
 464                          */
 465                         s5pv210_set_refresh(DMC0, 83000);
 466                         s5pv210_set_refresh(DMC1, 100000);
 467                 }
 468         }
 469
 470         cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
 471
 472         if (freqs.new < freqs.old) {
 473                 regulator_set_voltage(int_regulator,
 474                                 int_volt, int_volt_max);
 475
 476                 regulator_set_voltage(arm_regulator,
 477                                 arm_volt, arm_volt_max);
 478         }
 479
 480         printk(KERN_DEBUG "Perf changed[L%d]\n", index);
 481
 482 exit:
 483         mutex_unlock(&set_freq_lock);
 484         return ret;
 485 }
 486
 487 #ifdef CONFIG_PM
 488 static int s5pv210_cpufreq_suspend(struct cpufreq_policy *policy)
 489 {
 490         return 0;
 491 }
 492
 493 static int s5pv210_cpufreq_resume(struct cpufreq_policy *policy)
 494 {
 495         return 0;
 496 }
 497 #endif
 498
 499 static int check_mem_type(void __iomem *dmc_reg)
 500 {
 501         unsigned long val;
 502
 503         val = __raw_readl(dmc_reg + 0x4);
 504         val = (val & (0xf << 8));
 505
 506         return val >> 8;
 507 }
 508
 509 static int __init s5pv210_cpu_init(struct cpufreq_policy *policy)
 510 {
 511         unsigned long mem_type;
 512         int ret;
 513
 514         cpu_clk = clk_get(NULL, "armclk");
 515         if (IS_ERR(cpu_clk))
 516                 return PTR_ERR(cpu_clk);
 517
 518         dmc0_clk = clk_get(NULL, "sclk_dmc0");
 519         if (IS_ERR(dmc0_clk)) {
 520                 ret = PTR_ERR(dmc0_clk);
 521                 goto out_dmc0;
 522         }
 523
 524         dmc1_clk = clk_get(NULL, "hclk_msys");
 525         if (IS_ERR(dmc1_clk)) {
 526                 ret = PTR_ERR(dmc1_clk);
 527                 goto out_dmc1;
 528         }
 529
 530         if (policy->cpu != 0) {
 531                 ret = -EINVAL;
 532                 goto out_dmc1;
 533         }
 534
 535         /*
 536          * check_mem_type : This driver only support LPDDR & LPDDR2.
 537          * other memory type is not supported.
 538          */
 539         mem_type = check_mem_type(S5P_VA_DMC0);
 540
 541         if ((mem_type != LPDDR) && (mem_type != LPDDR2)) {
 542                 printk(KERN_ERR "CPUFreq doesn't support this memory type\n");
 543                 ret = -EINVAL;
 544                 goto out_dmc1;
 545         }
 546
 547         /* Find current refresh counter and frequency each DMC */
 548         s5pv210_dram_conf[0].refresh = (__raw_readl(S5P_VA_DMC0 + 0x30) * 1000);
 549         s5pv210_dram_conf[0].freq = clk_get_rate(dmc0_clk);
 550
 551         s5pv210_dram_conf[1].refresh = (__raw_readl(S5P_VA_DMC1 + 0x30) * 1000);
 552         s5pv210_dram_conf[1].freq = clk_get_rate(dmc1_clk);
 553
 554         policy->cur = policy->min = policy->max = s5pv210_getspeed(0);
 555
 556         cpufreq_frequency_table_get_attr(s5pv210_freq_table, policy->cpu);
 557
 558         policy->cpuinfo.transition_latency = 40000;
 559
 560         return cpufreq_frequency_table_cpuinfo(policy, s5pv210_freq_table);
 561
 562 out_dmc1:
 563         clk_put(dmc0_clk);
 564 out_dmc0:
 565         clk_put(cpu_clk);
 566         return ret;
 567 }
 568
 569 static int s5pv210_cpufreq_notifier_event(struct notifier_block *this,
 570                                           unsigned long event, void *ptr)
 571 {
 572         int ret;
 573
 574         switch (event) {
 575         case PM_SUSPEND_PREPARE:
 576                 ret = cpufreq_driver_target(cpufreq_cpu_get(0), SLEEP_FREQ,
 577                                             DISABLE_FURTHER_CPUFREQ);
 578                 if (ret < 0)
 579                         return NOTIFY_BAD;
 580
 581                 return NOTIFY_OK;
 582         case PM_POST_RESTORE:
 583         case PM_POST_SUSPEND:
 584                 cpufreq_driver_target(cpufreq_cpu_get(0), SLEEP_FREQ,
 585                                       ENABLE_FURTHER_CPUFREQ);
 586
 587                 return NOTIFY_OK;
 588         }
 589
 590         return NOTIFY_DONE;
 591 }
 592
 593 static int s5pv210_cpufreq_reboot_notifier_event(struct notifier_block *this,
 594                                                  unsigned long event, void *ptr)
 595 {
 596         int ret;
 597
 598         ret = cpufreq_driver_target(cpufreq_cpu_get(0), SLEEP_FREQ,
 599                                     DISABLE_FURTHER_CPUFREQ);
 600         if (ret < 0)
 601                 return NOTIFY_BAD;
 602
 603         return NOTIFY_DONE;
 604 }
 605
 606 static struct cpufreq_driver s5pv210_driver = {
 607         .flags          = CPUFREQ_STICKY,
 608         .verify         = s5pv210_verify_speed,
 609         .target         = s5pv210_target,
 610         .get            = s5pv210_getspeed,
 611         .init           = s5pv210_cpu_init,
 612         .name           = "s5pv210",
 613 #ifdef CONFIG_PM
 614         .suspend        = s5pv210_cpufreq_suspend,
 615         .resume         = s5pv210_cpufreq_resume,
 616 #endif
 617 };
 618
 619 static struct notifier_block s5pv210_cpufreq_notifier = {
 620         .notifier_call = s5pv210_cpufreq_notifier_event,
 621 };
 622
 623 static struct notifier_block s5pv210_cpufreq_reboot_notifier = {
 624         .notifier_call = s5pv210_cpufreq_reboot_notifier_event,
 625 };
 626
 627 static int __init s5pv210_cpufreq_init(void)
 628 {
 629         arm_regulator = regulator_get(NULL, "vddarm");
 630         if (IS_ERR(arm_regulator)) {
 631                 pr_err("failed to get regulator vddarm");
 632                 return PTR_ERR(arm_regulator);
 633         }
 634
 635         int_regulator = regulator_get(NULL, "vddint");
 636         if (IS_ERR(int_regulator)) {
 637                 pr_err("failed to get regulator vddint");
 638                 regulator_put(arm_regulator);
 639                 return PTR_ERR(int_regulator);
 640         }
 641
 642         register_pm_notifier(&s5pv210_cpufreq_notifier);
 643         register_reboot_notifier(&s5pv210_cpufreq_reboot_notifier);
 644
 645         return cpufreq_register_driver(&s5pv210_driver);
 646 }
 647
 648 late_initcall(s5pv210_cpufreq_init);