268 lines
7.5 KiB
C
268 lines
7.5 KiB
C
/*
|
|
* Copyright (c) 2010-2012 Samsung Electronics Co., Ltd.
|
|
* http://www.samsung.com
|
|
*
|
|
* EXYNOS4X12 - CPU frequency scaling support
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/err.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/io.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/cpufreq.h>
|
|
|
|
#include <mach/regs-clock.h>
|
|
|
|
#include "exynos-cpufreq.h"
|
|
|
|
static struct clk *cpu_clk;
|
|
static struct clk *moutcore;
|
|
static struct clk *mout_mpll;
|
|
static struct clk *mout_apll;
|
|
|
|
static unsigned int exynos4x12_volt_table[] = {
|
|
1350000, 1287500, 1250000, 1187500, 1137500, 1087500, 1037500,
|
|
1000000, 987500, 975000, 950000, 925000, 900000, 900000
|
|
};
|
|
|
|
static struct cpufreq_frequency_table exynos4x12_freq_table[] = {
|
|
{L0, CPUFREQ_ENTRY_INVALID},
|
|
{L1, 1400 * 1000},
|
|
{L2, 1300 * 1000},
|
|
{L3, 1200 * 1000},
|
|
{L4, 1100 * 1000},
|
|
{L5, 1000 * 1000},
|
|
{L6, 900 * 1000},
|
|
{L7, 800 * 1000},
|
|
{L8, 700 * 1000},
|
|
{L9, 600 * 1000},
|
|
{L10, 500 * 1000},
|
|
{L11, 400 * 1000},
|
|
{L12, 300 * 1000},
|
|
{L13, 200 * 1000},
|
|
{0, CPUFREQ_TABLE_END},
|
|
};
|
|
|
|
static struct apll_freq *apll_freq_4x12;
|
|
|
|
static struct apll_freq apll_freq_4212[] = {
|
|
/*
|
|
* values:
|
|
* freq
|
|
* clock divider for CORE, COREM0, COREM1, PERIPH, ATB, PCLK_DBG, APLL, CORE2
|
|
* clock divider for COPY, HPM, RESERVED
|
|
* PLL M, P, S
|
|
*/
|
|
APLL_FREQ(1500, 0, 3, 7, 0, 6, 1, 2, 0, 6, 2, 0, 250, 4, 0),
|
|
APLL_FREQ(1400, 0, 3, 7, 0, 6, 1, 2, 0, 6, 2, 0, 175, 3, 0),
|
|
APLL_FREQ(1300, 0, 3, 7, 0, 5, 1, 2, 0, 5, 2, 0, 325, 6, 0),
|
|
APLL_FREQ(1200, 0, 3, 7, 0, 5, 1, 2, 0, 5, 2, 0, 200, 4, 0),
|
|
APLL_FREQ(1100, 0, 3, 6, 0, 4, 1, 2, 0, 4, 2, 0, 275, 6, 0),
|
|
APLL_FREQ(1000, 0, 2, 5, 0, 4, 1, 1, 0, 4, 2, 0, 125, 3, 0),
|
|
APLL_FREQ(900, 0, 2, 5, 0, 3, 1, 1, 0, 3, 2, 0, 150, 4, 0),
|
|
APLL_FREQ(800, 0, 2, 5, 0, 3, 1, 1, 0, 3, 2, 0, 100, 3, 0),
|
|
APLL_FREQ(700, 0, 2, 4, 0, 3, 1, 1, 0, 3, 2, 0, 175, 3, 1),
|
|
APLL_FREQ(600, 0, 2, 4, 0, 3, 1, 1, 0, 3, 2, 0, 200, 4, 1),
|
|
APLL_FREQ(500, 0, 2, 4, 0, 3, 1, 1, 0, 3, 2, 0, 125, 3, 1),
|
|
APLL_FREQ(400, 0, 2, 4, 0, 3, 1, 1, 0, 3, 2, 0, 100, 3, 1),
|
|
APLL_FREQ(300, 0, 2, 4, 0, 2, 1, 1, 0, 3, 2, 0, 200, 4, 2),
|
|
APLL_FREQ(200, 0, 1, 3, 0, 1, 1, 1, 0, 3, 2, 0, 100, 3, 2),
|
|
};
|
|
|
|
static struct apll_freq apll_freq_4412[] = {
|
|
/*
|
|
* values:
|
|
* freq
|
|
* clock divider for CORE, COREM0, COREM1, PERIPH, ATB, PCLK_DBG, APLL, CORE2
|
|
* clock divider for COPY, HPM, CORES
|
|
* PLL M, P, S
|
|
*/
|
|
APLL_FREQ(1500, 0, 3, 7, 0, 6, 1, 2, 0, 6, 0, 7, 250, 4, 0),
|
|
APLL_FREQ(1400, 0, 3, 7, 0, 6, 1, 2, 0, 6, 0, 6, 175, 3, 0),
|
|
APLL_FREQ(1300, 0, 3, 7, 0, 5, 1, 2, 0, 5, 0, 6, 325, 6, 0),
|
|
APLL_FREQ(1200, 0, 3, 7, 0, 5, 1, 2, 0, 5, 0, 5, 200, 4, 0),
|
|
APLL_FREQ(1100, 0, 3, 6, 0, 4, 1, 2, 0, 4, 0, 5, 275, 6, 0),
|
|
APLL_FREQ(1000, 0, 2, 5, 0, 4, 1, 1, 0, 4, 0, 4, 125, 3, 0),
|
|
APLL_FREQ(900, 0, 2, 5, 0, 3, 1, 1, 0, 3, 0, 4, 150, 4, 0),
|
|
APLL_FREQ(800, 0, 2, 5, 0, 3, 1, 1, 0, 3, 0, 3, 100, 3, 0),
|
|
APLL_FREQ(700, 0, 2, 4, 0, 3, 1, 1, 0, 3, 0, 3, 175, 3, 1),
|
|
APLL_FREQ(600, 0, 2, 4, 0, 3, 1, 1, 0, 3, 0, 2, 200, 4, 1),
|
|
APLL_FREQ(500, 0, 2, 4, 0, 3, 1, 1, 0, 3, 0, 2, 125, 3, 1),
|
|
APLL_FREQ(400, 0, 2, 4, 0, 3, 1, 1, 0, 3, 0, 1, 100, 3, 1),
|
|
APLL_FREQ(300, 0, 2, 4, 0, 2, 1, 1, 0, 3, 0, 1, 200, 4, 2),
|
|
APLL_FREQ(200, 0, 1, 3, 0, 1, 1, 1, 0, 3, 0, 0, 100, 3, 2),
|
|
};
|
|
|
|
static void exynos4x12_set_clkdiv(unsigned int div_index)
|
|
{
|
|
unsigned int tmp;
|
|
unsigned int stat_cpu1;
|
|
|
|
/* Change Divider - CPU0 */
|
|
|
|
tmp = apll_freq_4x12[div_index].clk_div_cpu0;
|
|
|
|
__raw_writel(tmp, EXYNOS4_CLKDIV_CPU);
|
|
|
|
while (__raw_readl(EXYNOS4_CLKDIV_STATCPU) & 0x11111111)
|
|
cpu_relax();
|
|
|
|
/* Change Divider - CPU1 */
|
|
tmp = apll_freq_4x12[div_index].clk_div_cpu1;
|
|
|
|
__raw_writel(tmp, EXYNOS4_CLKDIV_CPU1);
|
|
if (soc_is_exynos4212())
|
|
stat_cpu1 = 0x11;
|
|
else
|
|
stat_cpu1 = 0x111;
|
|
|
|
while (__raw_readl(EXYNOS4_CLKDIV_STATCPU1) & stat_cpu1)
|
|
cpu_relax();
|
|
}
|
|
|
|
static void exynos4x12_set_apll(unsigned int index)
|
|
{
|
|
unsigned int tmp, pdiv;
|
|
|
|
/* 1. MUX_CORE_SEL = MPLL, ARMCLK uses MPLL for lock time */
|
|
clk_set_parent(moutcore, mout_mpll);
|
|
|
|
do {
|
|
cpu_relax();
|
|
tmp = (__raw_readl(EXYNOS4_CLKMUX_STATCPU)
|
|
>> EXYNOS4_CLKSRC_CPU_MUXCORE_SHIFT);
|
|
tmp &= 0x7;
|
|
} while (tmp != 0x2);
|
|
|
|
/* 2. Set APLL Lock time */
|
|
pdiv = ((apll_freq_4x12[index].mps >> 8) & 0x3f);
|
|
|
|
__raw_writel((pdiv * 250), EXYNOS4_APLL_LOCK);
|
|
|
|
/* 3. Change PLL PMS values */
|
|
tmp = __raw_readl(EXYNOS4_APLL_CON0);
|
|
tmp &= ~((0x3ff << 16) | (0x3f << 8) | (0x7 << 0));
|
|
tmp |= apll_freq_4x12[index].mps;
|
|
__raw_writel(tmp, EXYNOS4_APLL_CON0);
|
|
|
|
/* 4. wait_lock_time */
|
|
do {
|
|
cpu_relax();
|
|
tmp = __raw_readl(EXYNOS4_APLL_CON0);
|
|
} while (!(tmp & (0x1 << EXYNOS4_APLLCON0_LOCKED_SHIFT)));
|
|
|
|
/* 5. MUX_CORE_SEL = APLL */
|
|
clk_set_parent(moutcore, mout_apll);
|
|
|
|
do {
|
|
cpu_relax();
|
|
tmp = __raw_readl(EXYNOS4_CLKMUX_STATCPU);
|
|
tmp &= EXYNOS4_CLKMUX_STATCPU_MUXCORE_MASK;
|
|
} while (tmp != (0x1 << EXYNOS4_CLKSRC_CPU_MUXCORE_SHIFT));
|
|
}
|
|
|
|
static bool exynos4x12_pms_change(unsigned int old_index, unsigned int new_index)
|
|
{
|
|
unsigned int old_pm = apll_freq_4x12[old_index].mps >> 8;
|
|
unsigned int new_pm = apll_freq_4x12[new_index].mps >> 8;
|
|
|
|
return (old_pm == new_pm) ? 0 : 1;
|
|
}
|
|
|
|
static void exynos4x12_set_frequency(unsigned int old_index,
|
|
unsigned int new_index)
|
|
{
|
|
unsigned int tmp;
|
|
|
|
if (old_index > new_index) {
|
|
if (!exynos4x12_pms_change(old_index, new_index)) {
|
|
/* 1. Change the system clock divider values */
|
|
exynos4x12_set_clkdiv(new_index);
|
|
/* 2. Change just s value in apll m,p,s value */
|
|
tmp = __raw_readl(EXYNOS4_APLL_CON0);
|
|
tmp &= ~(0x7 << 0);
|
|
tmp |= apll_freq_4x12[new_index].mps & 0x7;
|
|
__raw_writel(tmp, EXYNOS4_APLL_CON0);
|
|
|
|
} else {
|
|
/* Clock Configuration Procedure */
|
|
/* 1. Change the system clock divider values */
|
|
exynos4x12_set_clkdiv(new_index);
|
|
/* 2. Change the apll m,p,s value */
|
|
exynos4x12_set_apll(new_index);
|
|
}
|
|
} else if (old_index < new_index) {
|
|
if (!exynos4x12_pms_change(old_index, new_index)) {
|
|
/* 1. Change just s value in apll m,p,s value */
|
|
tmp = __raw_readl(EXYNOS4_APLL_CON0);
|
|
tmp &= ~(0x7 << 0);
|
|
tmp |= apll_freq_4x12[new_index].mps & 0x7;
|
|
__raw_writel(tmp, EXYNOS4_APLL_CON0);
|
|
/* 2. Change the system clock divider values */
|
|
exynos4x12_set_clkdiv(new_index);
|
|
} else {
|
|
/* Clock Configuration Procedure */
|
|
/* 1. Change the apll m,p,s value */
|
|
exynos4x12_set_apll(new_index);
|
|
/* 2. Change the system clock divider values */
|
|
exynos4x12_set_clkdiv(new_index);
|
|
}
|
|
}
|
|
}
|
|
|
|
int exynos4x12_cpufreq_init(struct exynos_dvfs_info *info)
|
|
{
|
|
unsigned long rate;
|
|
|
|
cpu_clk = clk_get(NULL, "armclk");
|
|
if (IS_ERR(cpu_clk))
|
|
return PTR_ERR(cpu_clk);
|
|
|
|
moutcore = clk_get(NULL, "moutcore");
|
|
if (IS_ERR(moutcore))
|
|
goto err_moutcore;
|
|
|
|
mout_mpll = clk_get(NULL, "mout_mpll");
|
|
if (IS_ERR(mout_mpll))
|
|
goto err_mout_mpll;
|
|
|
|
rate = clk_get_rate(mout_mpll) / 1000;
|
|
|
|
mout_apll = clk_get(NULL, "mout_apll");
|
|
if (IS_ERR(mout_apll))
|
|
goto err_mout_apll;
|
|
|
|
if (soc_is_exynos4212())
|
|
apll_freq_4x12 = apll_freq_4212;
|
|
else
|
|
apll_freq_4x12 = apll_freq_4412;
|
|
|
|
info->mpll_freq_khz = rate;
|
|
/* 800Mhz */
|
|
info->pll_safe_idx = L7;
|
|
info->cpu_clk = cpu_clk;
|
|
info->volt_table = exynos4x12_volt_table;
|
|
info->freq_table = exynos4x12_freq_table;
|
|
info->set_freq = exynos4x12_set_frequency;
|
|
info->need_apll_change = exynos4x12_pms_change;
|
|
|
|
return 0;
|
|
|
|
err_mout_apll:
|
|
clk_put(mout_mpll);
|
|
err_mout_mpll:
|
|
clk_put(moutcore);
|
|
err_moutcore:
|
|
clk_put(cpu_clk);
|
|
|
|
pr_debug("%s: failed initialization\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL(exynos4x12_cpufreq_init);
|