drivers/cpufreq/exynos5250-cpufreq.c

   1 /*
   2  * Copyright (c) 2010-20122Samsung Electronics Co., Ltd.
   3  *              http://www.samsung.com
   4  *
   5  * EXYNOS5250 - CPU frequency scaling support
   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/module.h>
  13 #include <linux/kernel.h>
  14 #include <linux/err.h>
  15 #include <linux/clk.h>
  16 #include <linux/io.h>
  17 #include <linux/slab.h>
  18 #include <linux/cpufreq.h>
  19
  20 #include <mach/map.h>
  21 #include <mach/regs-clock.h>
  22
  23 #include "exynos-cpufreq.h"
  24
  25 static struct clk *cpu_clk;
  26 static struct clk *moutcore;
  27 static struct clk *mout_mpll;
  28 static struct clk *mout_apll;
  29
  30 static unsigned int exynos5250_volt_table[] = {
  31         1300000, 1250000, 1225000, 1200000, 1150000,
  32         1125000, 1100000, 1075000, 1050000, 1025000,
  33         1012500, 1000000,  975000,  950000,  937500,
  34         925000
  35 };
  36
  37 static struct cpufreq_frequency_table exynos5250_freq_table[] = {
  38         {L0, 1700 * 1000},
  39         {L1, 1600 * 1000},
  40         {L2, 1500 * 1000},
  41         {L3, 1400 * 1000},
  42         {L4, 1300 * 1000},
  43         {L5, 1200 * 1000},
  44         {L6, 1100 * 1000},
  45         {L7, 1000 * 1000},
  46         {L8,  900 * 1000},
  47         {L9,  800 * 1000},
  48         {L10, 700 * 1000},
  49         {L11, 600 * 1000},
  50         {L12, 500 * 1000},
  51         {L13, 400 * 1000},
  52         {L14, 300 * 1000},
  53         {L15, 200 * 1000},
  54         {0, CPUFREQ_TABLE_END},
  55 };
  56
  57 static struct apll_freq apll_freq_5250[] = {
  58         /*
  59          * values:
  60          * freq
  61          * clock divider for ARM, CPUD, ACP, PERIPH, ATB, PCLK_DBG, APLL, ARM2
  62          * clock divider for COPY, HPM, RESERVED
  63          * PLL M, P, S
  64          */
  65         APLL_FREQ(1700, 0, 3, 7, 7, 7, 3, 5, 0, 0, 2, 0, 425, 6, 0),
  66         APLL_FREQ(1600, 0, 3, 7, 7, 7, 1, 4, 0, 0, 2, 0, 200, 3, 0),
  67         APLL_FREQ(1500, 0, 2, 7, 7, 7, 1, 4, 0, 0, 2, 0, 250, 4, 0),
  68         APLL_FREQ(1400, 0, 2, 7, 7, 6, 1, 4, 0, 0, 2, 0, 175, 3, 0),
  69         APLL_FREQ(1300, 0, 2, 7, 7, 6, 1, 3, 0, 0, 2, 0, 325, 6, 0),
  70         APLL_FREQ(1200, 0, 2, 7, 7, 5, 1, 3, 0, 0, 2, 0, 200, 4, 0),
  71         APLL_FREQ(1100, 0, 3, 7, 7, 5, 1, 3, 0, 0, 2, 0, 275, 6, 0),
  72         APLL_FREQ(1000, 0, 1, 7, 7, 4, 1, 2, 0, 0, 2, 0, 125, 3, 0),
  73         APLL_FREQ(900,  0, 1, 7, 7, 4, 1, 2, 0, 0, 2, 0, 150, 4, 0),
  74         APLL_FREQ(800,  0, 1, 7, 7, 4, 1, 2, 0, 0, 2, 0, 100, 3, 0),
  75         APLL_FREQ(700,  0, 1, 7, 7, 3, 1, 1, 0, 0, 2, 0, 175, 3, 1),
  76         APLL_FREQ(600,  0, 1, 7, 7, 3, 1, 1, 0, 0, 2, 0, 200, 4, 1),
  77         APLL_FREQ(500,  0, 1, 7, 7, 2, 1, 1, 0, 0, 2, 0, 125, 3, 1),
  78         APLL_FREQ(400,  0, 1, 7, 7, 2, 1, 1, 0, 0, 2, 0, 100, 3, 1),
  79         APLL_FREQ(300,  0, 1, 7, 7, 1, 1, 1, 0, 0, 2, 0, 200, 4, 2),
  80         APLL_FREQ(200,  0, 1, 7, 7, 1, 1, 1, 0, 0, 2, 0, 100, 3, 2),
  81 };
  82
  83 static void set_clkdiv(unsigned int div_index)
  84 {
  85         unsigned int tmp;
  86
  87         /* Change Divider - CPU0 */
  88
  89         tmp = apll_freq_5250[div_index].clk_div_cpu0;
  90
  91         __raw_writel(tmp, EXYNOS5_CLKDIV_CPU0);
  92
  93         while (__raw_readl(EXYNOS5_CLKDIV_STATCPU0) & 0x11111111)
  94                 cpu_relax();
  95
  96         /* Change Divider - CPU1 */
  97         tmp = apll_freq_5250[div_index].clk_div_cpu1;
  98
  99         __raw_writel(tmp, EXYNOS5_CLKDIV_CPU1);
 100
 101         while (__raw_readl(EXYNOS5_CLKDIV_STATCPU1) & 0x11)
 102                 cpu_relax();
 103 }
 104
 105 static void set_apll(unsigned int new_index,
 106                              unsigned int old_index)
 107 {
 108         unsigned int tmp, pdiv;
 109
 110         /* 1. MUX_CORE_SEL = MPLL, ARMCLK uses MPLL for lock time */
 111         clk_set_parent(moutcore, mout_mpll);
 112
 113         do {
 114                 cpu_relax();
 115                 tmp = (__raw_readl(EXYNOS5_CLKMUX_STATCPU) >> 16);
 116                 tmp &= 0x7;
 117         } while (tmp != 0x2);
 118
 119         /* 2. Set APLL Lock time */
 120         pdiv = ((apll_freq_5250[new_index].mps >> 8) & 0x3f);
 121
 122         __raw_writel((pdiv * 250), EXYNOS5_APLL_LOCK);
 123
 124         /* 3. Change PLL PMS values */
 125         tmp = __raw_readl(EXYNOS5_APLL_CON0);
 126         tmp &= ~((0x3ff << 16) | (0x3f << 8) | (0x7 << 0));
 127         tmp |= apll_freq_5250[new_index].mps;
 128         __raw_writel(tmp, EXYNOS5_APLL_CON0);
 129
 130         /* 4. wait_lock_time */
 131         do {
 132                 cpu_relax();
 133                 tmp = __raw_readl(EXYNOS5_APLL_CON0);
 134         } while (!(tmp & (0x1 << 29)));
 135
 136         /* 5. MUX_CORE_SEL = APLL */
 137         clk_set_parent(moutcore, mout_apll);
 138
 139         do {
 140                 cpu_relax();
 141                 tmp = __raw_readl(EXYNOS5_CLKMUX_STATCPU);
 142                 tmp &= (0x7 << 16);
 143         } while (tmp != (0x1 << 16));
 144
 145 }
 146
 147 static bool exynos5250_pms_change(unsigned int old_index, unsigned int new_index)
 148 {
 149         unsigned int old_pm = apll_freq_5250[old_index].mps >> 8;
 150         unsigned int new_pm = apll_freq_5250[new_index].mps >> 8;
 151
 152         return (old_pm == new_pm) ? 0 : 1;
 153 }
 154
 155 static void exynos5250_set_frequency(unsigned int old_index,
 156                                   unsigned int new_index)
 157 {
 158         unsigned int tmp;
 159
 160         if (old_index > new_index) {
 161                 if (!exynos5250_pms_change(old_index, new_index)) {
 162                         /* 1. Change the system clock divider values */
 163                         set_clkdiv(new_index);
 164                         /* 2. Change just s value in apll m,p,s value */
 165                         tmp = __raw_readl(EXYNOS5_APLL_CON0);
 166                         tmp &= ~(0x7 << 0);
 167                         tmp |= apll_freq_5250[new_index].mps & 0x7;
 168                         __raw_writel(tmp, EXYNOS5_APLL_CON0);
 169
 170                 } else {
 171                         /* Clock Configuration Procedure */
 172                         /* 1. Change the system clock divider values */
 173                         set_clkdiv(new_index);
 174                         /* 2. Change the apll m,p,s value */
 175                         set_apll(new_index, old_index);
 176                 }
 177         } else if (old_index < new_index) {
 178                 if (!exynos5250_pms_change(old_index, new_index)) {
 179                         /* 1. Change just s value in apll m,p,s value */
 180                         tmp = __raw_readl(EXYNOS5_APLL_CON0);
 181                         tmp &= ~(0x7 << 0);
 182                         tmp |= apll_freq_5250[new_index].mps & 0x7;
 183                         __raw_writel(tmp, EXYNOS5_APLL_CON0);
 184                         /* 2. Change the system clock divider values */
 185                         set_clkdiv(new_index);
 186                 } else {
 187                         /* Clock Configuration Procedure */
 188                         /* 1. Change the apll m,p,s value */
 189                         set_apll(new_index, old_index);
 190                         /* 2. Change the system clock divider values */
 191                         set_clkdiv(new_index);
 192                 }
 193         }
 194 }
 195
 196 int exynos5250_cpufreq_init(struct exynos_dvfs_info *info)
 197 {
 198         unsigned long rate;
 199
 200         cpu_clk = clk_get(NULL, "armclk");
 201         if (IS_ERR(cpu_clk))
 202                 return PTR_ERR(cpu_clk);
 203
 204         moutcore = clk_get(NULL, "mout_cpu");
 205         if (IS_ERR(moutcore))
 206                 goto err_moutcore;
 207
 208         mout_mpll = clk_get(NULL, "mout_mpll");
 209         if (IS_ERR(mout_mpll))
 210                 goto err_mout_mpll;
 211
 212         rate = clk_get_rate(mout_mpll) / 1000;
 213
 214         mout_apll = clk_get(NULL, "mout_apll");
 215         if (IS_ERR(mout_apll))
 216                 goto err_mout_apll;
 217
 218         info->mpll_freq_khz = rate;
 219         /* 800Mhz */
 220         info->pll_safe_idx = L9;
 221         info->cpu_clk = cpu_clk;
 222         info->volt_table = exynos5250_volt_table;
 223         info->freq_table = exynos5250_freq_table;
 224         info->set_freq = exynos5250_set_frequency;
 225         info->need_apll_change = exynos5250_pms_change;
 226
 227         return 0;
 228
 229 err_mout_apll:
 230         clk_put(mout_mpll);
 231 err_mout_mpll:
 232         clk_put(moutcore);
 233 err_moutcore:
 234         clk_put(cpu_clk);
 235
 236         pr_err("%s: failed initialization\n", __func__);
 237         return -EINVAL;
 238 }
 239 EXPORT_SYMBOL(exynos5250_cpufreq_init);