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
  22 #include "exynos-cpufreq.h"
  23
  24 static struct clk *cpu_clk;
  25 static struct clk *moutcore;
  26 static struct clk *mout_mpll;
  27 static struct clk *mout_apll;
  28
  29 static unsigned int exynos5250_volt_table[] = {
  30         1300000, 1250000, 1225000, 1200000, 1150000,
  31         1125000, 1100000, 1075000, 1050000, 1025000,
  32         1012500, 1000000,  975000,  950000,  937500,
  33         925000
  34 };
  35
  36 static struct cpufreq_frequency_table exynos5250_freq_table[] = {
  37         {L0, 1700 * 1000},
  38         {L1, 1600 * 1000},
  39         {L2, 1500 * 1000},
  40         {L3, 1400 * 1000},
  41         {L4, 1300 * 1000},
  42         {L5, 1200 * 1000},
  43         {L6, 1100 * 1000},
  44         {L7, 1000 * 1000},
  45         {L8,  900 * 1000},
  46         {L9,  800 * 1000},
  47         {L10, 700 * 1000},
  48         {L11, 600 * 1000},
  49         {L12, 500 * 1000},
  50         {L13, 400 * 1000},
  51         {L14, 300 * 1000},
  52         {L15, 200 * 1000},
  53         {0, CPUFREQ_TABLE_END},
  54 };
  55
  56 static struct apll_freq apll_freq_5250[] = {
  57         /*
  58          * values:
  59          * freq
  60          * clock divider for ARM, CPUD, ACP, PERIPH, ATB, PCLK_DBG, APLL, ARM2
  61          * clock divider for COPY, HPM, RESERVED
  62          * PLL M, P, S
  63          */
  64         APLL_FREQ(1700, 0, 3, 7, 7, 7, 3, 5, 0, 0, 2, 0, 425, 6, 0),
  65         APLL_FREQ(1600, 0, 3, 7, 7, 7, 1, 4, 0, 0, 2, 0, 200, 3, 0),
  66         APLL_FREQ(1500, 0, 2, 7, 7, 7, 1, 4, 0, 0, 2, 0, 250, 4, 0),
  67         APLL_FREQ(1400, 0, 2, 7, 7, 6, 1, 4, 0, 0, 2, 0, 175, 3, 0),
  68         APLL_FREQ(1300, 0, 2, 7, 7, 6, 1, 3, 0, 0, 2, 0, 325, 6, 0),
  69         APLL_FREQ(1200, 0, 2, 7, 7, 5, 1, 3, 0, 0, 2, 0, 200, 4, 0),
  70         APLL_FREQ(1100, 0, 3, 7, 7, 5, 1, 3, 0, 0, 2, 0, 275, 6, 0),
  71         APLL_FREQ(1000, 0, 1, 7, 7, 4, 1, 2, 0, 0, 2, 0, 125, 3, 0),
  72         APLL_FREQ(900,  0, 1, 7, 7, 4, 1, 2, 0, 0, 2, 0, 150, 4, 0),
  73         APLL_FREQ(800,  0, 1, 7, 7, 4, 1, 2, 0, 0, 2, 0, 100, 3, 0),
  74         APLL_FREQ(700,  0, 1, 7, 7, 3, 1, 1, 0, 0, 2, 0, 175, 3, 1),
  75         APLL_FREQ(600,  0, 1, 7, 7, 3, 1, 1, 0, 0, 2, 0, 200, 4, 1),
  76         APLL_FREQ(500,  0, 1, 7, 7, 2, 1, 1, 0, 0, 2, 0, 125, 3, 1),
  77         APLL_FREQ(400,  0, 1, 7, 7, 2, 1, 1, 0, 0, 2, 0, 100, 3, 1),
  78         APLL_FREQ(300,  0, 1, 7, 7, 1, 1, 1, 0, 0, 2, 0, 200, 4, 2),
  79         APLL_FREQ(200,  0, 1, 7, 7, 1, 1, 1, 0, 0, 2, 0, 100, 3, 2),
  80 };
  81
  82 static void set_clkdiv(unsigned int div_index)
  83 {
  84         unsigned int tmp;
  85
  86         /* Change Divider - CPU0 */
  87
  88         tmp = apll_freq_5250[div_index].clk_div_cpu0;
  89
  90         __raw_writel(tmp, EXYNOS5_CLKDIV_CPU0);
  91
  92         while (__raw_readl(EXYNOS5_CLKDIV_STATCPU0) & 0x11111111)
  93                 cpu_relax();
  94
  95         /* Change Divider - CPU1 */
  96         tmp = apll_freq_5250[div_index].clk_div_cpu1;
  97
  98         __raw_writel(tmp, EXYNOS5_CLKDIV_CPU1);
  99
 100         while (__raw_readl(EXYNOS5_CLKDIV_STATCPU1) & 0x11)
 101                 cpu_relax();
 102 }
 103
 104 static void set_apll(unsigned int index)
 105 {
 106         unsigned int tmp;
 107         unsigned int freq = apll_freq_5250[index].freq;
 108
 109         /* MUX_CORE_SEL = MPLL, ARMCLK uses MPLL for lock time */
 110         clk_set_parent(moutcore, mout_mpll);
 111
 112         do {
 113                 cpu_relax();
 114                 tmp = (__raw_readl(EXYNOS5_CLKMUX_STATCPU) >> 16);
 115                 tmp &= 0x7;
 116         } while (tmp != 0x2);
 117
 118         clk_set_rate(mout_apll, freq * 1000);
 119
 120         /* MUX_CORE_SEL = APLL */
 121         clk_set_parent(moutcore, mout_apll);
 122
 123         do {
 124                 cpu_relax();
 125                 tmp = __raw_readl(EXYNOS5_CLKMUX_STATCPU);
 126                 tmp &= (0x7 << 16);
 127         } while (tmp != (0x1 << 16));
 128 }
 129
 130 static void exynos5250_set_frequency(unsigned int old_index,
 131                                   unsigned int new_index)
 132 {
 133         if (old_index > new_index) {
 134                 set_clkdiv(new_index);
 135                 set_apll(new_index);
 136         } else if (old_index < new_index) {
 137                 set_apll(new_index);
 138                 set_clkdiv(new_index);
 139         }
 140 }
 141
 142 int exynos5250_cpufreq_init(struct exynos_dvfs_info *info)
 143 {
 144         unsigned long rate;
 145
 146         cpu_clk = clk_get(NULL, "armclk");
 147         if (IS_ERR(cpu_clk))
 148                 return PTR_ERR(cpu_clk);
 149
 150         moutcore = clk_get(NULL, "mout_cpu");
 151         if (IS_ERR(moutcore))
 152                 goto err_moutcore;
 153
 154         mout_mpll = clk_get(NULL, "mout_mpll");
 155         if (IS_ERR(mout_mpll))
 156                 goto err_mout_mpll;
 157
 158         rate = clk_get_rate(mout_mpll) / 1000;
 159
 160         mout_apll = clk_get(NULL, "mout_apll");
 161         if (IS_ERR(mout_apll))
 162                 goto err_mout_apll;
 163
 164         info->mpll_freq_khz = rate;
 165         /* 800Mhz */
 166         info->pll_safe_idx = L9;
 167         info->cpu_clk = cpu_clk;
 168         info->volt_table = exynos5250_volt_table;
 169         info->freq_table = exynos5250_freq_table;
 170         info->set_freq = exynos5250_set_frequency;
 171
 172         return 0;
 173
 174 err_mout_apll:
 175         clk_put(mout_mpll);
 176 err_mout_mpll:
 177         clk_put(moutcore);
 178 err_moutcore:
 179         clk_put(cpu_clk);
 180
 181         pr_err("%s: failed initialization\n", __func__);
 182         return -EINVAL;
 183 }