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linux-next/drivers/cpufreq/exynos4x12-cpufreq.c
Jaecheol Lee a35c50510d EXYNOS4X12: Add support cpufreq for EXYNOS4X12 
This patch adds support cpufreq for EXYNOS4X12 SoCs. Basically,
the exynos-cpufreq.c is used commonly and exynos4x12-cpufreq.c
is used for EXYNOS4212(two Cortex-A9 cores) and EXYNOS4412(four
Cortex-A9 cores) SoCs.

Signed-off-by: Jaecheol Lee <jc.lee@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Dave Jones <davej@redhat.com>
2012-03-14 14:39:47 -04:00

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/*
* 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 <mach/cpufreq.h>
#define CPUFREQ_LEVEL_END (L13 + 1)
static int max_support_idx;
static int min_support_idx = (CPUFREQ_LEVEL_END - 1);
static struct clk *cpu_clk;
static struct clk *moutcore;
static struct clk *mout_mpll;
static struct clk *mout_apll;
struct cpufreq_clkdiv {
unsigned int index;
unsigned int clkdiv;
unsigned int clkdiv1;
};
static unsigned int exynos4x12_volt_table[CPUFREQ_LEVEL_END];
static struct cpufreq_frequency_table exynos4x12_freq_table[] = {
{L0, 1500 * 1000},
{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 cpufreq_clkdiv exynos4x12_clkdiv_table[CPUFREQ_LEVEL_END];
static unsigned int clkdiv_cpu0_4212[CPUFREQ_LEVEL_END][8] = {
/*
* Clock divider value for following
* { DIVCORE, DIVCOREM0, DIVCOREM1, DIVPERIPH,
* DIVATB, DIVPCLK_DBG, DIVAPLL, DIVCORE2 }
*/
/* ARM L0: 1500 MHz */
{ 0, 3, 7, 0, 6, 1, 2, 0 },
/* ARM L1: 1400 MHz */
{ 0, 3, 7, 0, 6, 1, 2, 0 },
/* ARM L2: 1300 MHz */
{ 0, 3, 7, 0, 5, 1, 2, 0 },
/* ARM L3: 1200 MHz */
{ 0, 3, 7, 0, 5, 1, 2, 0 },
/* ARM L4: 1100 MHz */
{ 0, 3, 6, 0, 4, 1, 2, 0 },
/* ARM L5: 1000 MHz */
{ 0, 2, 5, 0, 4, 1, 1, 0 },
/* ARM L6: 900 MHz */
{ 0, 2, 5, 0, 3, 1, 1, 0 },
/* ARM L7: 800 MHz */
{ 0, 2, 5, 0, 3, 1, 1, 0 },
/* ARM L8: 700 MHz */
{ 0, 2, 4, 0, 3, 1, 1, 0 },
/* ARM L9: 600 MHz */
{ 0, 2, 4, 0, 3, 1, 1, 0 },
/* ARM L10: 500 MHz */
{ 0, 2, 4, 0, 3, 1, 1, 0 },
/* ARM L11: 400 MHz */
{ 0, 2, 4, 0, 3, 1, 1, 0 },
/* ARM L12: 300 MHz */
{ 0, 2, 4, 0, 2, 1, 1, 0 },
/* ARM L13: 200 MHz */
{ 0, 1, 3, 0, 1, 1, 1, 0 },
};
static unsigned int clkdiv_cpu0_4412[CPUFREQ_LEVEL_END][8] = {
/*
* Clock divider value for following
* { DIVCORE, DIVCOREM0, DIVCOREM1, DIVPERIPH,
* DIVATB, DIVPCLK_DBG, DIVAPLL, DIVCORE2 }
*/
/* ARM L0: 1500 MHz */
{ 0, 3, 7, 0, 6, 1, 2, 0 },
/* ARM L1: 1400 MHz */
{ 0, 3, 7, 0, 6, 1, 2, 0 },
/* ARM L2: 1300 MHz */
{ 0, 3, 7, 0, 5, 1, 2, 0 },
/* ARM L3: 1200 MHz */
{ 0, 3, 7, 0, 5, 1, 2, 0 },
/* ARM L4: 1100 MHz */
{ 0, 3, 6, 0, 4, 1, 2, 0 },
/* ARM L5: 1000 MHz */
{ 0, 2, 5, 0, 4, 1, 1, 0 },
/* ARM L6: 900 MHz */
{ 0, 2, 5, 0, 3, 1, 1, 0 },
/* ARM L7: 800 MHz */
{ 0, 2, 5, 0, 3, 1, 1, 0 },
/* ARM L8: 700 MHz */
{ 0, 2, 4, 0, 3, 1, 1, 0 },
/* ARM L9: 600 MHz */
{ 0, 2, 4, 0, 3, 1, 1, 0 },
/* ARM L10: 500 MHz */
{ 0, 2, 4, 0, 3, 1, 1, 0 },
/* ARM L11: 400 MHz */
{ 0, 2, 4, 0, 3, 1, 1, 0 },
/* ARM L12: 300 MHz */
{ 0, 2, 4, 0, 2, 1, 1, 0 },
/* ARM L13: 200 MHz */
{ 0, 1, 3, 0, 1, 1, 1, 0 },
};
static unsigned int clkdiv_cpu1_4212[CPUFREQ_LEVEL_END][2] = {
/* Clock divider value for following
* { DIVCOPY, DIVHPM }
*/
/* ARM L0: 1500 MHz */
{ 6, 0 },
/* ARM L1: 1400 MHz */
{ 6, 0 },
/* ARM L2: 1300 MHz */
{ 5, 0 },
/* ARM L3: 1200 MHz */
{ 5, 0 },
/* ARM L4: 1100 MHz */
{ 4, 0 },
/* ARM L5: 1000 MHz */
{ 4, 0 },
/* ARM L6: 900 MHz */
{ 3, 0 },
/* ARM L7: 800 MHz */
{ 3, 0 },
/* ARM L8: 700 MHz */
{ 3, 0 },
/* ARM L9: 600 MHz */
{ 3, 0 },
/* ARM L10: 500 MHz */
{ 3, 0 },
/* ARM L11: 400 MHz */
{ 3, 0 },
/* ARM L12: 300 MHz */
{ 3, 0 },
/* ARM L13: 200 MHz */
{ 3, 0 },
};
static unsigned int clkdiv_cpu1_4412[CPUFREQ_LEVEL_END][3] = {
/* Clock divider value for following
* { DIVCOPY, DIVHPM, DIVCORES }
*/
/* ARM L0: 1500 MHz */
{ 6, 0, 7 },
/* ARM L1: 1400 MHz */
{ 6, 0, 6 },
/* ARM L2: 1300 MHz */
{ 5, 0, 6 },
/* ARM L3: 1200 MHz */
{ 5, 0, 5 },
/* ARM L4: 1100 MHz */
{ 4, 0, 5 },
/* ARM L5: 1000 MHz */
{ 4, 0, 4 },
/* ARM L6: 900 MHz */
{ 3, 0, 4 },
/* ARM L7: 800 MHz */
{ 3, 0, 3 },
/* ARM L8: 700 MHz */
{ 3, 0, 3 },
/* ARM L9: 600 MHz */
{ 3, 0, 2 },
/* ARM L10: 500 MHz */
{ 3, 0, 2 },
/* ARM L11: 400 MHz */
{ 3, 0, 1 },
/* ARM L12: 300 MHz */
{ 3, 0, 1 },
/* ARM L13: 200 MHz */
{ 3, 0, 0 },
};
static unsigned int exynos4x12_apll_pms_table[CPUFREQ_LEVEL_END] = {
/* APLL FOUT L0: 1500 MHz */
((250 << 16) | (4 << 8) | (0x0)),
/* APLL FOUT L1: 1400 MHz */
((175 << 16) | (3 << 8) | (0x0)),
/* APLL FOUT L2: 1300 MHz */
((325 << 16) | (6 << 8) | (0x0)),
/* APLL FOUT L3: 1200 MHz */
((200 << 16) | (4 << 8) | (0x0)),
/* APLL FOUT L4: 1100 MHz */
((275 << 16) | (6 << 8) | (0x0)),
/* APLL FOUT L5: 1000 MHz */
((125 << 16) | (3 << 8) | (0x0)),
/* APLL FOUT L6: 900 MHz */
((150 << 16) | (4 << 8) | (0x0)),
/* APLL FOUT L7: 800 MHz */
((100 << 16) | (3 << 8) | (0x0)),
/* APLL FOUT L8: 700 MHz */
((175 << 16) | (3 << 8) | (0x1)),
/* APLL FOUT L9: 600 MHz */
((200 << 16) | (4 << 8) | (0x1)),
/* APLL FOUT L10: 500 MHz */
((125 << 16) | (3 << 8) | (0x1)),
/* APLL FOUT L11 400 MHz */
((100 << 16) | (3 << 8) | (0x1)),
/* APLL FOUT L12: 300 MHz */
((200 << 16) | (4 << 8) | (0x2)),
/* APLL FOUT L13: 200 MHz */
((100 << 16) | (3 << 8) | (0x2)),
};
static const unsigned int asv_voltage_4x12[CPUFREQ_LEVEL_END] = {
1350000, 1287500, 1250000, 1187500, 1137500, 1087500, 1037500,
1000000, 987500, 975000, 950000, 925000, 900000, 900000
};
static void exynos4x12_set_clkdiv(unsigned int div_index)
{
unsigned int tmp;
unsigned int stat_cpu1;
/* Change Divider - CPU0 */
tmp = exynos4x12_clkdiv_table[div_index].clkdiv;
__raw_writel(tmp, EXYNOS4_CLKDIV_CPU);
while (__raw_readl(EXYNOS4_CLKDIV_STATCPU) & 0x11111111)
cpu_relax();
/* Change Divider - CPU1 */
tmp = exynos4x12_clkdiv_table[div_index].clkdiv1;
__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 = ((exynos4x12_apll_pms_table[index] >> 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 |= exynos4x12_apll_pms_table[index];
__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));
}
bool exynos4x12_pms_change(unsigned int old_index, unsigned int new_index)
{
unsigned int old_pm = exynos4x12_apll_pms_table[old_index] >> 8;
unsigned int new_pm = exynos4x12_apll_pms_table[new_index] >> 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 |= (exynos4x12_apll_pms_table[new_index] & 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 |= (exynos4x12_apll_pms_table[new_index] & 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);
}
}
}
static void __init set_volt_table(void)
{
unsigned int i;
max_support_idx = L1;
/* Not supported */
exynos4x12_freq_table[L0].frequency = CPUFREQ_ENTRY_INVALID;
for (i = 0 ; i < CPUFREQ_LEVEL_END ; i++)
exynos4x12_volt_table[i] = asv_voltage_4x12[i];
}
int exynos4x12_cpufreq_init(struct exynos_dvfs_info *info)
{
int i;
unsigned int tmp;
unsigned long rate;
set_volt_table();
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;
for (i = L0; i < CPUFREQ_LEVEL_END; i++) {
exynos4x12_clkdiv_table[i].index = i;
tmp = __raw_readl(EXYNOS4_CLKDIV_CPU);
tmp &= ~(EXYNOS4_CLKDIV_CPU0_CORE_MASK |
EXYNOS4_CLKDIV_CPU0_COREM0_MASK |
EXYNOS4_CLKDIV_CPU0_COREM1_MASK |
EXYNOS4_CLKDIV_CPU0_PERIPH_MASK |
EXYNOS4_CLKDIV_CPU0_ATB_MASK |
EXYNOS4_CLKDIV_CPU0_PCLKDBG_MASK |
EXYNOS4_CLKDIV_CPU0_APLL_MASK);
if (soc_is_exynos4212()) {
tmp |= ((clkdiv_cpu0_4212[i][0] << EXYNOS4_CLKDIV_CPU0_CORE_SHIFT) |
(clkdiv_cpu0_4212[i][1] << EXYNOS4_CLKDIV_CPU0_COREM0_SHIFT) |
(clkdiv_cpu0_4212[i][2] << EXYNOS4_CLKDIV_CPU0_COREM1_SHIFT) |
(clkdiv_cpu0_4212[i][3] << EXYNOS4_CLKDIV_CPU0_PERIPH_SHIFT) |
(clkdiv_cpu0_4212[i][4] << EXYNOS4_CLKDIV_CPU0_ATB_SHIFT) |
(clkdiv_cpu0_4212[i][5] << EXYNOS4_CLKDIV_CPU0_PCLKDBG_SHIFT) |
(clkdiv_cpu0_4212[i][6] << EXYNOS4_CLKDIV_CPU0_APLL_SHIFT));
} else {
tmp &= ~EXYNOS4_CLKDIV_CPU0_CORE2_MASK;
tmp |= ((clkdiv_cpu0_4412[i][0] << EXYNOS4_CLKDIV_CPU0_CORE_SHIFT) |
(clkdiv_cpu0_4412[i][1] << EXYNOS4_CLKDIV_CPU0_COREM0_SHIFT) |
(clkdiv_cpu0_4412[i][2] << EXYNOS4_CLKDIV_CPU0_COREM1_SHIFT) |
(clkdiv_cpu0_4412[i][3] << EXYNOS4_CLKDIV_CPU0_PERIPH_SHIFT) |
(clkdiv_cpu0_4412[i][4] << EXYNOS4_CLKDIV_CPU0_ATB_SHIFT) |
(clkdiv_cpu0_4412[i][5] << EXYNOS4_CLKDIV_CPU0_PCLKDBG_SHIFT) |
(clkdiv_cpu0_4412[i][6] << EXYNOS4_CLKDIV_CPU0_APLL_SHIFT) |
(clkdiv_cpu0_4412[i][7] << EXYNOS4_CLKDIV_CPU0_CORE2_SHIFT));
}
exynos4x12_clkdiv_table[i].clkdiv = tmp;
tmp = __raw_readl(EXYNOS4_CLKDIV_CPU1);
if (soc_is_exynos4212()) {
tmp &= ~(EXYNOS4_CLKDIV_CPU1_COPY_MASK |
EXYNOS4_CLKDIV_CPU1_HPM_MASK);
tmp |= ((clkdiv_cpu1_4212[i][0] << EXYNOS4_CLKDIV_CPU1_COPY_SHIFT) |
(clkdiv_cpu1_4212[i][1] << EXYNOS4_CLKDIV_CPU1_HPM_SHIFT));
} else {
tmp &= ~(EXYNOS4_CLKDIV_CPU1_COPY_MASK |
EXYNOS4_CLKDIV_CPU1_HPM_MASK |
EXYNOS4_CLKDIV_CPU1_CORES_MASK);
tmp |= ((clkdiv_cpu1_4412[i][0] << EXYNOS4_CLKDIV_CPU1_COPY_SHIFT) |
(clkdiv_cpu1_4412[i][1] << EXYNOS4_CLKDIV_CPU1_HPM_SHIFT) |
(clkdiv_cpu1_4412[i][2] << EXYNOS4_CLKDIV_CPU1_CORES_SHIFT));
}
exynos4x12_clkdiv_table[i].clkdiv1 = tmp;
}
info->mpll_freq_khz = rate;
info->pm_lock_idx = L5;
info->pll_safe_idx = L7;
info->max_support_idx = max_support_idx;
info->min_support_idx = min_support_idx;
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);
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