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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  13
  14 #include <linux/types.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/err.h>
  18 #include <linux/clk.h>
  19 #include <linux/io.h>
  20 #include <linux/cpufreq.h>
  21 #include <linux/of.h>
  22 #include <linux/of_address.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/reboot.h>
  25 #include <linux/regulator/consumer.h>
  26
  27 static void __iomem *clk_base;
  28 static void __iomem *dmc_base[2];
  29
  30 #define S5P_CLKREG(x)           (clk_base + (x))
  31
  32 #define S5P_APLL_LOCK           S5P_CLKREG(0x00)
  33 #define S5P_APLL_CON            S5P_CLKREG(0x100)
  34 #define S5P_CLK_SRC0            S5P_CLKREG(0x200)
  35 #define S5P_CLK_SRC2            S5P_CLKREG(0x208)
  36 #define S5P_CLK_DIV0            S5P_CLKREG(0x300)
  37 #define S5P_CLK_DIV2            S5P_CLKREG(0x308)
  38 #define S5P_CLK_DIV6            S5P_CLKREG(0x318)
  39 #define S5P_CLKDIV_STAT0        S5P_CLKREG(0x1000)
  40 #define S5P_CLKDIV_STAT1        S5P_CLKREG(0x1004)
  41 #define S5P_CLKMUX_STAT0        S5P_CLKREG(0x1100)
  42 #define S5P_CLKMUX_STAT1        S5P_CLKREG(0x1104)
  43
  44 #define S5P_ARM_MCS_CON         S5P_CLKREG(0x6100)
  45
  46 /* CLKSRC0 */
  47 #define S5P_CLKSRC0_MUX200_SHIFT        (16)
  48 #define S5P_CLKSRC0_MUX200_MASK         (0x1 << S5P_CLKSRC0_MUX200_SHIFT)
  49 #define S5P_CLKSRC0_MUX166_MASK         (0x1<<20)
  50 #define S5P_CLKSRC0_MUX133_MASK         (0x1<<24)
  51
  52 /* CLKSRC2 */
  53 #define S5P_CLKSRC2_G3D_SHIFT           (0)
  54 #define S5P_CLKSRC2_G3D_MASK            (0x3 << S5P_CLKSRC2_G3D_SHIFT)
  55 #define S5P_CLKSRC2_MFC_SHIFT           (4)
  56 #define S5P_CLKSRC2_MFC_MASK            (0x3 << S5P_CLKSRC2_MFC_SHIFT)
  57
  58 /* CLKDIV0 */
  59 #define S5P_CLKDIV0_APLL_SHIFT          (0)
  60 #define S5P_CLKDIV0_APLL_MASK           (0x7 << S5P_CLKDIV0_APLL_SHIFT)
  61 #define S5P_CLKDIV0_A2M_SHIFT           (4)
  62 #define S5P_CLKDIV0_A2M_MASK            (0x7 << S5P_CLKDIV0_A2M_SHIFT)
  63 #define S5P_CLKDIV0_HCLK200_SHIFT       (8)
  64 #define S5P_CLKDIV0_HCLK200_MASK        (0x7 << S5P_CLKDIV0_HCLK200_SHIFT)
  65 #define S5P_CLKDIV0_PCLK100_SHIFT       (12)
  66 #define S5P_CLKDIV0_PCLK100_MASK        (0x7 << S5P_CLKDIV0_PCLK100_SHIFT)
  67 #define S5P_CLKDIV0_HCLK166_SHIFT       (16)
  68 #define S5P_CLKDIV0_HCLK166_MASK        (0xF << S5P_CLKDIV0_HCLK166_SHIFT)
  69 #define S5P_CLKDIV0_PCLK83_SHIFT        (20)
  70 #define S5P_CLKDIV0_PCLK83_MASK         (0x7 << S5P_CLKDIV0_PCLK83_SHIFT)
  71 #define S5P_CLKDIV0_HCLK133_SHIFT       (24)
  72 #define S5P_CLKDIV0_HCLK133_MASK        (0xF << S5P_CLKDIV0_HCLK133_SHIFT)
  73 #define S5P_CLKDIV0_PCLK66_SHIFT        (28)
  74 #define S5P_CLKDIV0_PCLK66_MASK         (0x7 << S5P_CLKDIV0_PCLK66_SHIFT)
  75
  76 /* CLKDIV2 */
  77 #define S5P_CLKDIV2_G3D_SHIFT           (0)
  78 #define S5P_CLKDIV2_G3D_MASK            (0xF << S5P_CLKDIV2_G3D_SHIFT)
  79 #define S5P_CLKDIV2_MFC_SHIFT           (4)
  80 #define S5P_CLKDIV2_MFC_MASK            (0xF << S5P_CLKDIV2_MFC_SHIFT)
  81
  82 /* CLKDIV6 */
  83 #define S5P_CLKDIV6_ONEDRAM_SHIFT       (28)
  84 #define S5P_CLKDIV6_ONEDRAM_MASK        (0xF << S5P_CLKDIV6_ONEDRAM_SHIFT)
  85
  86 static struct clk *dmc0_clk;
  87 static struct clk *dmc1_clk;
  88 static DEFINE_MUTEX(set_freq_lock);
  89
  90 /* APLL M,P,S values for 1G/800Mhz */
  91 #define APLL_VAL_1000   ((1 << 31) | (125 << 16) | (3 << 8) | 1)
  92 #define APLL_VAL_800    ((1 << 31) | (100 << 16) | (3 << 8) | 1)
  93
  94 /* Use 800MHz when entering sleep mode */
  95 #define SLEEP_FREQ      (800 * 1000)
  96
  97 /* Tracks if cpu freqency can be updated anymore */
  98 static bool no_cpufreq_access;
  99
 100 /*
 101  * DRAM configurations to calculate refresh counter for changing
 102  * frequency of memory.
 103  */
 104 struct dram_conf {
 105         unsigned long freq;     /* HZ */
 106         unsigned long refresh;  /* DRAM refresh counter * 1000 */
 107 };
 108
 109 /* DRAM configuration (DMC0 and DMC1) */
 110 static struct dram_conf s5pv210_dram_conf[2];
 111
 112 enum perf_level {
 113         L0, L1, L2, L3, L4,
 114 };
 115
 116 enum s5pv210_mem_type {
 117         LPDDR   = 0x1,
 118         LPDDR2  = 0x2,
 119         DDR2    = 0x4,
 120 };
 121
 122 enum s5pv210_dmc_port {
 123         DMC0 = 0,
 124         DMC1,
 125 };
 126
 127 static struct cpufreq_frequency_table s5pv210_freq_table[] = {
 128         {0, L0, 1000*1000},
 129         {0, L1, 800*1000},
 130         {0, L2, 400*1000},
 131         {0, L3, 200*1000},
 132         {0, L4, 100*1000},
 133         {0, 0, CPUFREQ_TABLE_END},
 134 };
 135
 136 static struct regulator *arm_regulator;
 137 static struct regulator *int_regulator;
 138
 139 struct s5pv210_dvs_conf {
 140         int arm_volt;   /* uV */
 141         int int_volt;   /* uV */
 142 };
 143
 144 static const int arm_volt_max = 1350000;
 145 static const int int_volt_max = 1250000;
 146
 147 static struct s5pv210_dvs_conf dvs_conf[] = {
 148         [L0] = {
 149                 .arm_volt       = 1250000,
 150                 .int_volt       = 1100000,
 151         },
 152         [L1] = {
 153                 .arm_volt       = 1200000,
 154                 .int_volt       = 1100000,
 155         },
 156         [L2] = {
 157                 .arm_volt       = 1050000,
 158                 .int_volt       = 1100000,
 159         },
 160         [L3] = {
 161                 .arm_volt       = 950000,
 162                 .int_volt       = 1100000,
 163         },
 164         [L4] = {
 165                 .arm_volt       = 950000,
 166                 .int_volt       = 1000000,
 167         },
 168 };
 169
 170 static u32 clkdiv_val[5][11] = {
 171         /*
 172          * Clock divider value for following
 173          * { APLL, A2M, HCLK_MSYS, PCLK_MSYS,
 174          *   HCLK_DSYS, PCLK_DSYS, HCLK_PSYS, PCLK_PSYS,
 175          *   ONEDRAM, MFC, G3D }
 176          */
 177
 178         /* L0 : [1000/200/100][166/83][133/66][200/200] */
 179         {0, 4, 4, 1, 3, 1, 4, 1, 3, 0, 0},
 180
 181         /* L1 : [800/200/100][166/83][133/66][200/200] */
 182         {0, 3, 3, 1, 3, 1, 4, 1, 3, 0, 0},
 183
 184         /* L2 : [400/200/100][166/83][133/66][200/200] */
 185         {1, 3, 1, 1, 3, 1, 4, 1, 3, 0, 0},
 186
 187         /* L3 : [200/200/100][166/83][133/66][200/200] */
 188         {3, 3, 1, 1, 3, 1, 4, 1, 3, 0, 0},
 189
 190         /* L4 : [100/100/100][83/83][66/66][100/100] */
 191         {7, 7, 0, 0, 7, 0, 9, 0, 7, 0, 0},
 192 };
 193
 194 /*
 195  * This function set DRAM refresh counter
 196  * accoriding to operating frequency of DRAM
 197  * ch: DMC port number 0 or 1
 198  * freq: Operating frequency of DRAM(KHz)
 199  */
 200 static void s5pv210_set_refresh(enum s5pv210_dmc_port ch, unsigned long freq)
 201 {
 202         unsigned long tmp, tmp1;
 203         void __iomem *reg = NULL;
 204
 205         if (ch == DMC0) {
 206                 reg = (dmc_base[0] + 0x30);
 207         } else if (ch == DMC1) {
 208                 reg = (dmc_base[1] + 0x30);
 209         } else {
 210                 pr_err("Cannot find DMC port\n");
 211                 return;
 212         }
 213
 214         /* Find current DRAM frequency */
 215         tmp = s5pv210_dram_conf[ch].freq;
 216
 217         tmp /= freq;
 218
 219         tmp1 = s5pv210_dram_conf[ch].refresh;
 220
 221         tmp1 /= tmp;
 222
 223         __raw_writel(tmp1, reg);
 224 }
 225
 226 static int s5pv210_target(struct cpufreq_policy *policy, unsigned int index)
 227 {
 228         unsigned long reg;
 229         unsigned int priv_index;
 230         unsigned int pll_changing = 0;
 231         unsigned int bus_speed_changing = 0;
 232         unsigned int old_freq, new_freq;
 233         int arm_volt, int_volt;
 234         int ret = 0;
 235
 236         mutex_lock(&set_freq_lock);
 237
 238         if (no_cpufreq_access) {
 239                 pr_err("Denied access to %s as it is disabled temporarily\n",
 240                        __func__);
 241                 ret = -EINVAL;
 242                 goto exit;
 243         }
 244
 245         old_freq = policy->cur;
 246         new_freq = s5pv210_freq_table[index].frequency;
 247
 248         /* Finding current running level index */
 249         priv_index = cpufreq_table_find_index_h(policy, old_freq);
 250
 251         arm_volt = dvs_conf[index].arm_volt;
 252         int_volt = dvs_conf[index].int_volt;
 253
 254         if (new_freq > old_freq) {
 255                 ret = regulator_set_voltage(arm_regulator,
 256                                 arm_volt, arm_volt_max);
 257                 if (ret)
 258                         goto exit;
 259
 260                 ret = regulator_set_voltage(int_regulator,
 261                                 int_volt, int_volt_max);
 262                 if (ret)
 263                         goto exit;
 264         }
 265
 266         /* Check if there need to change PLL */
 267         if ((index == L0) || (priv_index == L0))
 268                 pll_changing = 1;
 269
 270         /* Check if there need to change System bus clock */
 271         if ((index == L4) || (priv_index == L4))
 272                 bus_speed_changing = 1;
 273
 274         if (bus_speed_changing) {
 275                 /*
 276                  * Reconfigure DRAM refresh counter value for minimum
 277                  * temporary clock while changing divider.
 278                  * expected clock is 83Mhz : 7.8usec/(1/83Mhz) = 0x287
 279                  */
 280                 if (pll_changing)
 281                         s5pv210_set_refresh(DMC1, 83000);
 282                 else
 283                         s5pv210_set_refresh(DMC1, 100000);
 284
 285                 s5pv210_set_refresh(DMC0, 83000);
 286         }
 287
 288         /*
 289          * APLL should be changed in this level
 290          * APLL -> MPLL(for stable transition) -> APLL
 291          * Some clock source's clock API are not prepared.
 292          * Do not use clock API in below code.
 293          */
 294         if (pll_changing) {
 295                 /*
 296                  * 1. Temporary Change divider for MFC and G3D
 297                  * SCLKA2M(200/1=200)->(200/4=50)Mhz
 298                  */
 299                 reg = __raw_readl(S5P_CLK_DIV2);
 300                 reg &= ~(S5P_CLKDIV2_G3D_MASK | S5P_CLKDIV2_MFC_MASK);
 301                 reg |= (3 << S5P_CLKDIV2_G3D_SHIFT) |
 302                         (3 << S5P_CLKDIV2_MFC_SHIFT);
 303                 __raw_writel(reg, S5P_CLK_DIV2);
 304
 305                 /* For MFC, G3D dividing */
 306                 do {
 307                         reg = __raw_readl(S5P_CLKDIV_STAT0);
 308                 } while (reg & ((1 << 16) | (1 << 17)));
 309
 310                 /*
 311                  * 2. Change SCLKA2M(200Mhz)to SCLKMPLL in MFC_MUX, G3D MUX
 312                  * (200/4=50)->(667/4=166)Mhz
 313                  */
 314                 reg = __raw_readl(S5P_CLK_SRC2);
 315                 reg &= ~(S5P_CLKSRC2_G3D_MASK | S5P_CLKSRC2_MFC_MASK);
 316                 reg |= (1 << S5P_CLKSRC2_G3D_SHIFT) |
 317                         (1 << S5P_CLKSRC2_MFC_SHIFT);
 318                 __raw_writel(reg, S5P_CLK_SRC2);
 319
 320                 do {
 321                         reg = __raw_readl(S5P_CLKMUX_STAT1);
 322                 } while (reg & ((1 << 7) | (1 << 3)));
 323
 324                 /*
 325                  * 3. DMC1 refresh count for 133Mhz if (index == L4) is
 326                  * true refresh counter is already programed in upper
 327                  * code. 0x287@83Mhz
 328                  */
 329                 if (!bus_speed_changing)
 330                         s5pv210_set_refresh(DMC1, 133000);
 331
 332                 /* 4. SCLKAPLL -> SCLKMPLL */
 333                 reg = __raw_readl(S5P_CLK_SRC0);
 334                 reg &= ~(S5P_CLKSRC0_MUX200_MASK);
 335                 reg |= (0x1 << S5P_CLKSRC0_MUX200_SHIFT);
 336                 __raw_writel(reg, S5P_CLK_SRC0);
 337
 338                 do {
 339                         reg = __raw_readl(S5P_CLKMUX_STAT0);
 340                 } while (reg & (0x1 << 18));
 341
 342         }
 343
 344         /* Change divider */
 345         reg = __raw_readl(S5P_CLK_DIV0);
 346
 347         reg &= ~(S5P_CLKDIV0_APLL_MASK | S5P_CLKDIV0_A2M_MASK |
 348                 S5P_CLKDIV0_HCLK200_MASK | S5P_CLKDIV0_PCLK100_MASK |
 349                 S5P_CLKDIV0_HCLK166_MASK | S5P_CLKDIV0_PCLK83_MASK |
 350                 S5P_CLKDIV0_HCLK133_MASK | S5P_CLKDIV0_PCLK66_MASK);
 351
 352         reg |= ((clkdiv_val[index][0] << S5P_CLKDIV0_APLL_SHIFT) |
 353                 (clkdiv_val[index][1] << S5P_CLKDIV0_A2M_SHIFT) |
 354                 (clkdiv_val[index][2] << S5P_CLKDIV0_HCLK200_SHIFT) |
 355                 (clkdiv_val[index][3] << S5P_CLKDIV0_PCLK100_SHIFT) |
 356                 (clkdiv_val[index][4] << S5P_CLKDIV0_HCLK166_SHIFT) |
 357                 (clkdiv_val[index][5] << S5P_CLKDIV0_PCLK83_SHIFT) |
 358                 (clkdiv_val[index][6] << S5P_CLKDIV0_HCLK133_SHIFT) |
 359                 (clkdiv_val[index][7] << S5P_CLKDIV0_PCLK66_SHIFT));
 360
 361         __raw_writel(reg, S5P_CLK_DIV0);
 362
 363         do {
 364                 reg = __raw_readl(S5P_CLKDIV_STAT0);
 365         } while (reg & 0xff);
 366
 367         /* ARM MCS value changed */
 368         reg = __raw_readl(S5P_ARM_MCS_CON);
 369         reg &= ~0x3;
 370         if (index >= L3)
 371                 reg |= 0x3;
 372         else
 373                 reg |= 0x1;
 374
 375         __raw_writel(reg, S5P_ARM_MCS_CON);
 376
 377         if (pll_changing) {
 378                 /* 5. Set Lock time = 30us*24Mhz = 0x2cf */
 379                 __raw_writel(0x2cf, S5P_APLL_LOCK);
 380
 381                 /*
 382                  * 6. Turn on APLL
 383                  * 6-1. Set PMS values
 384                  * 6-2. Wait untile the PLL is locked
 385                  */
 386                 if (index == L0)
 387                         __raw_writel(APLL_VAL_1000, S5P_APLL_CON);
 388                 else
 389                         __raw_writel(APLL_VAL_800, S5P_APLL_CON);
 390
 391                 do {
 392                         reg = __raw_readl(S5P_APLL_CON);
 393                 } while (!(reg & (0x1 << 29)));
 394
 395                 /*
 396                  * 7. Change souce clock from SCLKMPLL(667Mhz)
 397                  * to SCLKA2M(200Mhz) in MFC_MUX and G3D MUX
 398                  * (667/4=166)->(200/4=50)Mhz
 399                  */
 400                 reg = __raw_readl(S5P_CLK_SRC2);
 401                 reg &= ~(S5P_CLKSRC2_G3D_MASK | S5P_CLKSRC2_MFC_MASK);
 402                 reg |= (0 << S5P_CLKSRC2_G3D_SHIFT) |
 403                         (0 << S5P_CLKSRC2_MFC_SHIFT);
 404                 __raw_writel(reg, S5P_CLK_SRC2);
 405
 406                 do {
 407                         reg = __raw_readl(S5P_CLKMUX_STAT1);
 408                 } while (reg & ((1 << 7) | (1 << 3)));
 409
 410                 /*
 411                  * 8. Change divider for MFC and G3D
 412                  * (200/4=50)->(200/1=200)Mhz
 413                  */
 414                 reg = __raw_readl(S5P_CLK_DIV2);
 415                 reg &= ~(S5P_CLKDIV2_G3D_MASK | S5P_CLKDIV2_MFC_MASK);
 416                 reg |= (clkdiv_val[index][10] << S5P_CLKDIV2_G3D_SHIFT) |
 417                         (clkdiv_val[index][9] << S5P_CLKDIV2_MFC_SHIFT);
 418                 __raw_writel(reg, S5P_CLK_DIV2);
 419
 420                 /* For MFC, G3D dividing */
 421                 do {
 422                         reg = __raw_readl(S5P_CLKDIV_STAT0);
 423                 } while (reg & ((1 << 16) | (1 << 17)));
 424
 425                 /* 9. Change MPLL to APLL in MSYS_MUX */
 426                 reg = __raw_readl(S5P_CLK_SRC0);
 427                 reg &= ~(S5P_CLKSRC0_MUX200_MASK);
 428                 reg |= (0x0 << S5P_CLKSRC0_MUX200_SHIFT);
 429                 __raw_writel(reg, S5P_CLK_SRC0);
 430
 431                 do {
 432                         reg = __raw_readl(S5P_CLKMUX_STAT0);
 433                 } while (reg & (0x1 << 18));
 434
 435                 /*
 436                  * 10. DMC1 refresh counter
 437                  * L4 : DMC1 = 100Mhz 7.8us/(1/100) = 0x30c
 438                  * Others : DMC1 = 200Mhz 7.8us/(1/200) = 0x618
 439                  */
 440                 if (!bus_speed_changing)
 441                         s5pv210_set_refresh(DMC1, 200000);
 442         }
 443
 444         /*
 445          * L4 level need to change memory bus speed, hence onedram clock divier
 446          * and memory refresh parameter should be changed
 447          */
 448         if (bus_speed_changing) {
 449                 reg = __raw_readl(S5P_CLK_DIV6);
 450                 reg &= ~S5P_CLKDIV6_ONEDRAM_MASK;
 451                 reg |= (clkdiv_val[index][8] << S5P_CLKDIV6_ONEDRAM_SHIFT);
 452                 __raw_writel(reg, S5P_CLK_DIV6);
 453
 454                 do {
 455                         reg = __raw_readl(S5P_CLKDIV_STAT1);
 456                 } while (reg & (1 << 15));
 457
 458                 /* Reconfigure DRAM refresh counter value */
 459                 if (index != L4) {
 460                         /*
 461                          * DMC0 : 166Mhz
 462                          * DMC1 : 200Mhz
 463                          */
 464                         s5pv210_set_refresh(DMC0, 166000);
 465                         s5pv210_set_refresh(DMC1, 200000);
 466                 } else {
 467                         /*
 468                          * DMC0 : 83Mhz
 469                          * DMC1 : 100Mhz
 470                          */
 471                         s5pv210_set_refresh(DMC0, 83000);
 472                         s5pv210_set_refresh(DMC1, 100000);
 473                 }
 474         }
 475
 476         if (new_freq < old_freq) {
 477                 regulator_set_voltage(int_regulator,
 478                                 int_volt, int_volt_max);
 479
 480                 regulator_set_voltage(arm_regulator,
 481                                 arm_volt, arm_volt_max);
 482         }
 483
 484         printk(KERN_DEBUG "Perf changed[L%d]\n", index);
 485
 486 exit:
 487         mutex_unlock(&set_freq_lock);
 488         return ret;
 489 }
 490
 491 static int check_mem_type(void __iomem *dmc_reg)
 492 {
 493         unsigned long val;
 494
 495         val = __raw_readl(dmc_reg + 0x4);
 496         val = (val & (0xf << 8));
 497
 498         return val >> 8;
 499 }
 500
 501 static int s5pv210_cpu_init(struct cpufreq_policy *policy)
 502 {
 503         unsigned long mem_type;
 504         int ret;
 505
 506         policy->clk = clk_get(NULL, "armclk");
 507         if (IS_ERR(policy->clk))
 508                 return PTR_ERR(policy->clk);
 509
 510         dmc0_clk = clk_get(NULL, "sclk_dmc0");
 511         if (IS_ERR(dmc0_clk)) {
 512                 ret = PTR_ERR(dmc0_clk);
 513                 goto out_dmc0;
 514         }
 515
 516         dmc1_clk = clk_get(NULL, "hclk_msys");
 517         if (IS_ERR(dmc1_clk)) {
 518                 ret = PTR_ERR(dmc1_clk);
 519                 goto out_dmc1;
 520         }
 521
 522         if (policy->cpu != 0) {
 523                 ret = -EINVAL;
 524                 goto out_dmc1;
 525         }
 526
 527         /*
 528          * check_mem_type : This driver only support LPDDR & LPDDR2.
 529          * other memory type is not supported.
 530          */
 531         mem_type = check_mem_type(dmc_base[0]);
 532
 533         if ((mem_type != LPDDR) && (mem_type != LPDDR2)) {
 534                 pr_err("CPUFreq doesn't support this memory type\n");
 535                 ret = -EINVAL;
 536                 goto out_dmc1;
 537         }
 538
 539         /* Find current refresh counter and frequency each DMC */
 540         s5pv210_dram_conf[0].refresh = (__raw_readl(dmc_base[0] + 0x30) * 1000);
 541         s5pv210_dram_conf[0].freq = clk_get_rate(dmc0_clk);
 542
 543         s5pv210_dram_conf[1].refresh = (__raw_readl(dmc_base[1] + 0x30) * 1000);
 544         s5pv210_dram_conf[1].freq = clk_get_rate(dmc1_clk);
 545
 546         policy->suspend_freq = SLEEP_FREQ;
 547         return cpufreq_generic_init(policy, s5pv210_freq_table, 40000);
 548
 549 out_dmc1:
 550         clk_put(dmc0_clk);
 551 out_dmc0:
 552         clk_put(policy->clk);
 553         return ret;
 554 }
 555
 556 static int s5pv210_cpufreq_reboot_notifier_event(struct notifier_block *this,
 557                                                  unsigned long event, void *ptr)
 558 {
 559         int ret;
 560
 561         ret = cpufreq_driver_target(cpufreq_cpu_get(0), SLEEP_FREQ, 0);
 562         if (ret < 0)
 563                 return NOTIFY_BAD;
 564
 565         no_cpufreq_access = true;
 566         return NOTIFY_DONE;
 567 }
 568
 569 static struct cpufreq_driver s5pv210_driver = {
 570         .flags          = CPUFREQ_STICKY | CPUFREQ_NEED_INITIAL_FREQ_CHECK,
 571         .verify         = cpufreq_generic_frequency_table_verify,
 572         .target_index   = s5pv210_target,
 573         .get            = cpufreq_generic_get,
 574         .init           = s5pv210_cpu_init,
 575         .name           = "s5pv210",
 576         .suspend        = cpufreq_generic_suspend,
 577         .resume         = cpufreq_generic_suspend, /* We need to set SLEEP FREQ again */
 578 };
 579
 580 static struct notifier_block s5pv210_cpufreq_reboot_notifier = {
 581         .notifier_call = s5pv210_cpufreq_reboot_notifier_event,
 582 };
 583
 584 static int s5pv210_cpufreq_probe(struct platform_device *pdev)
 585 {
 586         struct device_node *np;
 587         int id;
 588
 589         /*
 590          * HACK: This is a temporary workaround to get access to clock
 591          * and DMC controller registers directly and remove static mappings
 592          * and dependencies on platform headers. It is necessary to enable
 593          * S5PV210 multi-platform support and will be removed together with
 594          * this whole driver as soon as S5PV210 gets migrated to use
 595          * cpufreq-dt driver.
 596          */
 597         np = of_find_compatible_node(NULL, NULL, "samsung,s5pv210-clock");
 598         if (!np) {
 599                 pr_err("%s: failed to find clock controller DT node\n",
 600                         __func__);
 601                 return -ENODEV;
 602         }
 603
 604         clk_base = of_iomap(np, 0);
 605         if (!clk_base) {
 606                 pr_err("%s: failed to map clock registers\n", __func__);
 607                 return -EFAULT;
 608         }
 609
 610         for_each_compatible_node(np, NULL, "samsung,s5pv210-dmc") {
 611                 id = of_alias_get_id(np, "dmc");
 612                 if (id < 0 || id >= ARRAY_SIZE(dmc_base)) {
 613                         pr_err("%s: failed to get alias of dmc node '%s'\n",
 614                                 __func__, np->name);
 615                         return id;
 616                 }
 617
 618                 dmc_base[id] = of_iomap(np, 0);
 619                 if (!dmc_base[id]) {
 620                         pr_err("%s: failed to map dmc%d registers\n",
 621                                 __func__, id);
 622                         return -EFAULT;
 623                 }
 624         }
 625
 626         for (id = 0; id < ARRAY_SIZE(dmc_base); ++id) {
 627                 if (!dmc_base[id]) {
 628                         pr_err("%s: failed to find dmc%d node\n", __func__, id);
 629                         return -ENODEV;
 630                 }
 631         }
 632
 633         arm_regulator = regulator_get(NULL, "vddarm");
 634         if (IS_ERR(arm_regulator)) {
 635                 pr_err("failed to get regulator vddarm\n");
 636                 return PTR_ERR(arm_regulator);
 637         }
 638
 639         int_regulator = regulator_get(NULL, "vddint");
 640         if (IS_ERR(int_regulator)) {
 641                 pr_err("failed to get regulator vddint\n");
 642                 regulator_put(arm_regulator);
 643                 return PTR_ERR(int_regulator);
 644         }
 645
 646         register_reboot_notifier(&s5pv210_cpufreq_reboot_notifier);
 647
 648         return cpufreq_register_driver(&s5pv210_driver);
 649 }
 650
 651 static struct platform_driver s5pv210_cpufreq_platdrv = {
 652         .driver = {
 653                 .name   = "s5pv210-cpufreq",
 654         },
 655         .probe = s5pv210_cpufreq_probe,
 656 };
 657 builtin_platform_driver(s5pv210_cpufreq_platdrv);