158 lines
3.7 KiB
C
158 lines
3.7 KiB
C
/*
|
|
* Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
|
|
* http://www.samsung.com
|
|
*
|
|
* EXYNOS4210 - 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 "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 exynos4210_volt_table[] = {
|
|
1250000, 1150000, 1050000, 975000, 950000,
|
|
};
|
|
|
|
static struct cpufreq_frequency_table exynos4210_freq_table[] = {
|
|
{0, L0, 1200 * 1000},
|
|
{0, L1, 1000 * 1000},
|
|
{0, L2, 800 * 1000},
|
|
{0, L3, 500 * 1000},
|
|
{0, L4, 200 * 1000},
|
|
{0, 0, CPUFREQ_TABLE_END},
|
|
};
|
|
|
|
static struct apll_freq apll_freq_4210[] = {
|
|
/*
|
|
* values:
|
|
* freq
|
|
* clock divider for CORE, COREM0, COREM1, PERIPH, ATB, PCLK_DBG, APLL, RESERVED
|
|
* clock divider for COPY, HPM, RESERVED
|
|
* PLL M, P, S
|
|
*/
|
|
APLL_FREQ(1200, 0, 3, 7, 3, 4, 1, 7, 0, 5, 0, 0, 150, 3, 1),
|
|
APLL_FREQ(1000, 0, 3, 7, 3, 4, 1, 7, 0, 4, 0, 0, 250, 6, 1),
|
|
APLL_FREQ(800, 0, 3, 7, 3, 3, 1, 7, 0, 3, 0, 0, 200, 6, 1),
|
|
APLL_FREQ(500, 0, 3, 7, 3, 3, 1, 7, 0, 3, 0, 0, 250, 6, 2),
|
|
APLL_FREQ(200, 0, 1, 3, 1, 3, 1, 0, 0, 3, 0, 0, 200, 6, 3),
|
|
};
|
|
|
|
static void exynos4210_set_clkdiv(unsigned int div_index)
|
|
{
|
|
unsigned int tmp;
|
|
|
|
/* Change Divider - CPU0 */
|
|
|
|
tmp = apll_freq_4210[div_index].clk_div_cpu0;
|
|
|
|
__raw_writel(tmp, EXYNOS4_CLKDIV_CPU);
|
|
|
|
do {
|
|
tmp = __raw_readl(EXYNOS4_CLKDIV_STATCPU);
|
|
} while (tmp & 0x1111111);
|
|
|
|
/* Change Divider - CPU1 */
|
|
|
|
tmp = apll_freq_4210[div_index].clk_div_cpu1;
|
|
|
|
__raw_writel(tmp, EXYNOS4_CLKDIV_CPU1);
|
|
|
|
do {
|
|
tmp = __raw_readl(EXYNOS4_CLKDIV_STATCPU1);
|
|
} while (tmp & 0x11);
|
|
}
|
|
|
|
static void exynos4210_set_apll(unsigned int index)
|
|
{
|
|
unsigned int tmp, freq = apll_freq_4210[index].freq;
|
|
|
|
/* MUX_CORE_SEL = MPLL, ARMCLK uses MPLL for lock time */
|
|
clk_set_parent(moutcore, mout_mpll);
|
|
|
|
do {
|
|
tmp = (__raw_readl(EXYNOS4_CLKMUX_STATCPU)
|
|
>> EXYNOS4_CLKSRC_CPU_MUXCORE_SHIFT);
|
|
tmp &= 0x7;
|
|
} while (tmp != 0x2);
|
|
|
|
clk_set_rate(mout_apll, freq * 1000);
|
|
|
|
/* MUX_CORE_SEL = APLL */
|
|
clk_set_parent(moutcore, mout_apll);
|
|
|
|
do {
|
|
tmp = __raw_readl(EXYNOS4_CLKMUX_STATCPU);
|
|
tmp &= EXYNOS4_CLKMUX_STATCPU_MUXCORE_MASK;
|
|
} while (tmp != (0x1 << EXYNOS4_CLKSRC_CPU_MUXCORE_SHIFT));
|
|
}
|
|
|
|
static void exynos4210_set_frequency(unsigned int old_index,
|
|
unsigned int new_index)
|
|
{
|
|
if (old_index > new_index) {
|
|
exynos4210_set_clkdiv(new_index);
|
|
exynos4210_set_apll(new_index);
|
|
} else if (old_index < new_index) {
|
|
exynos4210_set_apll(new_index);
|
|
exynos4210_set_clkdiv(new_index);
|
|
}
|
|
}
|
|
|
|
int exynos4210_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;
|
|
|
|
info->mpll_freq_khz = rate;
|
|
/* 800Mhz */
|
|
info->pll_safe_idx = L2;
|
|
info->cpu_clk = cpu_clk;
|
|
info->volt_table = exynos4210_volt_table;
|
|
info->freq_table = exynos4210_freq_table;
|
|
info->set_freq = exynos4210_set_frequency;
|
|
|
|
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;
|
|
}
|