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EXYNOS5250: Add support cpufreq for EXYNOS5250
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This patch adds support cpufreq for EXYNOS5250 SoC. Basically,
the exynos-cpufreq.c is used commonly and exynos5250-cpufreq.c
is used for EXYNOS5250(two Cortex-A15 cores) SoC.

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>
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Jaecheol Lee authored and Dave Jones committed Mar 14, 2012
1 parent a35c505 commit 562a6cb
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Showing 5 changed files with 358 additions and 0 deletions.
1 change: 1 addition & 0 deletions arch/arm/mach-exynos/include/mach/cpufreq.h
Original file line number Diff line number Diff line change
Expand Up @@ -33,3 +33,4 @@ struct exynos_dvfs_info {

extern int exynos4210_cpufreq_init(struct exynos_dvfs_info *);
extern int exynos4x12_cpufreq_init(struct exynos_dvfs_info *);
extern int exynos5250_cpufreq_init(struct exynos_dvfs_info *);
7 changes: 7 additions & 0 deletions drivers/cpufreq/Kconfig.arm
Original file line number Diff line number Diff line change
Expand Up @@ -48,6 +48,7 @@ config ARM_EXYNOS_CPUFREQ
depends on ARCH_EXYNOS
select ARM_EXYNOS4210_CPUFREQ if CPU_EXYNOS4210
select ARM_EXYNOS4X12_CPUFREQ if (SOC_EXYNOS4212 || SOC_EXYNOS4412)
select ARM_EXYNOS5250_CPUFREQ if SOC_EXYNOS5250
default y
help
This adds the CPUFreq driver common part for Samsung
Expand All @@ -67,3 +68,9 @@ config ARM_EXYNOS4X12_CPUFREQ
help
This adds the CPUFreq driver for Samsung EXYNOS4X12
SoC (EXYNOS4212 or EXYNOS4412).

config ARM_EXYNOS5250_CPUFREQ
bool "Samsung EXYNOS5250"
help
This adds the CPUFreq driver for Samsung EXYNOS5250
SoC.
1 change: 1 addition & 0 deletions drivers/cpufreq/Makefile
Original file line number Diff line number Diff line change
Expand Up @@ -46,6 +46,7 @@ obj-$(CONFIG_ARM_S5PV210_CPUFREQ) += s5pv210-cpufreq.o
obj-$(CONFIG_ARM_EXYNOS_CPUFREQ) += exynos-cpufreq.o
obj-$(CONFIG_ARM_EXYNOS4210_CPUFREQ) += exynos4210-cpufreq.o
obj-$(CONFIG_ARM_EXYNOS4X12_CPUFREQ) += exynos4x12-cpufreq.o
obj-$(CONFIG_ARM_EXYNOS5250_CPUFREQ) += exynos5250-cpufreq.o
obj-$(CONFIG_ARCH_OMAP2PLUS) += omap-cpufreq.o

##################################################################################
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2 changes: 2 additions & 0 deletions drivers/cpufreq/exynos-cpufreq.c
Original file line number Diff line number Diff line change
Expand Up @@ -256,6 +256,8 @@ static int __init exynos_cpufreq_init(void)
ret = exynos4210_cpufreq_init(exynos_info);
else if (soc_is_exynos4212() || soc_is_exynos4412())
ret = exynos4x12_cpufreq_init(exynos_info);
else if (soc_is_exynos5250())
ret = exynos5250_cpufreq_init(exynos_info);
else
pr_err("%s: CPU type not found\n", __func__);

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347 changes: 347 additions & 0 deletions drivers/cpufreq/exynos5250-cpufreq.c
Original file line number Diff line number Diff line change
@@ -0,0 +1,347 @@
/*
* Copyright (c) 2010-20122Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* EXYNOS5250 - 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/map.h>
#include <mach/regs-clock.h>
#include <mach/cpufreq.h>

#define CPUFREQ_LEVEL_END (L15 + 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 exynos5250_volt_table[CPUFREQ_LEVEL_END];

static struct cpufreq_frequency_table exynos5250_freq_table[] = {
{L0, 1700 * 1000},
{L1, 1600 * 1000},
{L2, 1500 * 1000},
{L3, 1400 * 1000},
{L4, 1300 * 1000},
{L5, 1200 * 1000},
{L6, 1100 * 1000},
{L7, 1000 * 1000},
{L8, 900 * 1000},
{L9, 800 * 1000},
{L10, 700 * 1000},
{L11, 600 * 1000},
{L12, 500 * 1000},
{L13, 400 * 1000},
{L14, 300 * 1000},
{L15, 200 * 1000},
{0, CPUFREQ_TABLE_END},
};

static struct cpufreq_clkdiv exynos5250_clkdiv_table[CPUFREQ_LEVEL_END];

static unsigned int clkdiv_cpu0_5250[CPUFREQ_LEVEL_END][8] = {
/*
* Clock divider value for following
* { ARM, CPUD, ACP, PERIPH, ATB, PCLK_DBG, APLL, ARM2 }
*/
{ 0, 3, 7, 7, 6, 1, 3, 0 }, /* 1700 MHz - N/A */
{ 0, 3, 7, 7, 6, 1, 3, 0 }, /* 1600 MHz - N/A */
{ 0, 3, 7, 7, 5, 1, 3, 0 }, /* 1500 MHz - N/A */
{ 0, 3, 7, 7, 6, 1, 3, 0 }, /* 1400 MHz */
{ 0, 3, 7, 7, 6, 1, 3, 0 }, /* 1300 MHz */
{ 0, 3, 7, 7, 5, 1, 3, 0 }, /* 1200 MHz */
{ 0, 2, 7, 7, 5, 1, 2, 0 }, /* 1100 MHz */
{ 0, 2, 7, 7, 4, 1, 2, 0 }, /* 1000 MHz */
{ 0, 2, 7, 7, 4, 1, 2, 0 }, /* 900 MHz */
{ 0, 2, 7, 7, 3, 1, 1, 0 }, /* 800 MHz */
{ 0, 1, 7, 7, 3, 1, 1, 0 }, /* 700 MHz */
{ 0, 1, 7, 7, 2, 1, 1, 0 }, /* 600 MHz */
{ 0, 1, 7, 7, 2, 1, 1, 0 }, /* 500 MHz */
{ 0, 1, 7, 7, 1, 1, 1, 0 }, /* 400 MHz */
{ 0, 1, 7, 7, 1, 1, 1, 0 }, /* 300 MHz */
{ 0, 1, 7, 7, 1, 1, 1, 0 }, /* 200 MHz */
};

static unsigned int clkdiv_cpu1_5250[CPUFREQ_LEVEL_END][2] = {
/* Clock divider value for following
* { COPY, HPM }
*/
{ 0, 2 }, /* 1700 MHz - N/A */
{ 0, 2 }, /* 1600 MHz - N/A */
{ 0, 2 }, /* 1500 MHz - N/A */
{ 0, 2 }, /* 1400 MHz */
{ 0, 2 }, /* 1300 MHz */
{ 0, 2 }, /* 1200 MHz */
{ 0, 2 }, /* 1100 MHz */
{ 0, 2 }, /* 1000 MHz */
{ 0, 2 }, /* 900 MHz */
{ 0, 2 }, /* 800 MHz */
{ 0, 2 }, /* 700 MHz */
{ 0, 2 }, /* 600 MHz */
{ 0, 2 }, /* 500 MHz */
{ 0, 2 }, /* 400 MHz */
{ 0, 2 }, /* 300 MHz */
{ 0, 2 }, /* 200 MHz */
};

static unsigned int exynos5_apll_pms_table[CPUFREQ_LEVEL_END] = {
(0), /* 1700 MHz - N/A */
(0), /* 1600 MHz - N/A */
(0), /* 1500 MHz - N/A */
(0), /* 1400 MHz */
((325 << 16) | (6 << 8) | 0), /* 1300 MHz */
((200 << 16) | (4 << 8) | 0), /* 1200 MHz */
((275 << 16) | (6 << 8) | 0), /* 1100 MHz */
((125 << 16) | (3 << 8) | 0), /* 1000 MHz */
((150 << 16) | (4 << 8) | 0), /* 900 MHz */
((100 << 16) | (3 << 8) | 0), /* 800 MHz */
((175 << 16) | (3 << 8) | 1), /* 700 MHz */
((200 << 16) | (4 << 8) | 1), /* 600 MHz */
((125 << 16) | (3 << 8) | 1), /* 500 MHz */
((100 << 16) | (3 << 8) | 1), /* 400 MHz */
((200 << 16) | (4 << 8) | 2), /* 300 MHz */
((100 << 16) | (3 << 8) | 2), /* 200 MHz */
};

/* ASV group voltage table */
static const unsigned int asv_voltage_5250[CPUFREQ_LEVEL_END] = {
0, 0, 0, 0, 0, 0, 0, /* 1700 MHz ~ 1100 MHz Not supported */
1175000, 1125000, 1075000, 1050000, 1000000,
950000, 925000, 925000, 900000
};

static void set_clkdiv(unsigned int div_index)
{
unsigned int tmp;

/* Change Divider - CPU0 */

tmp = exynos5250_clkdiv_table[div_index].clkdiv;

__raw_writel(tmp, EXYNOS5_CLKDIV_CPU0);

while (__raw_readl(EXYNOS5_CLKDIV_STATCPU0) & 0x11111111)
cpu_relax();

/* Change Divider - CPU1 */
tmp = exynos5250_clkdiv_table[div_index].clkdiv1;

__raw_writel(tmp, EXYNOS5_CLKDIV_CPU1);

while (__raw_readl(EXYNOS5_CLKDIV_STATCPU1) & 0x11)
cpu_relax();
}

static void set_apll(unsigned int new_index,
unsigned int old_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(EXYNOS5_CLKMUX_STATCPU) >> 16);
tmp &= 0x7;
} while (tmp != 0x2);

/* 2. Set APLL Lock time */
pdiv = ((exynos5_apll_pms_table[new_index] >> 8) & 0x3f);

__raw_writel((pdiv * 250), EXYNOS5_APLL_LOCK);

/* 3. Change PLL PMS values */
tmp = __raw_readl(EXYNOS5_APLL_CON0);
tmp &= ~((0x3ff << 16) | (0x3f << 8) | (0x7 << 0));
tmp |= exynos5_apll_pms_table[new_index];
__raw_writel(tmp, EXYNOS5_APLL_CON0);

/* 4. wait_lock_time */
do {
cpu_relax();
tmp = __raw_readl(EXYNOS5_APLL_CON0);
} while (!(tmp & (0x1 << 29)));

/* 5. MUX_CORE_SEL = APLL */
clk_set_parent(moutcore, mout_apll);

do {
cpu_relax();
tmp = __raw_readl(EXYNOS5_CLKMUX_STATCPU);
tmp &= (0x7 << 16);
} while (tmp != (0x1 << 16));

}

bool exynos5250_pms_change(unsigned int old_index, unsigned int new_index)
{
unsigned int old_pm = (exynos5_apll_pms_table[old_index] >> 8);
unsigned int new_pm = (exynos5_apll_pms_table[new_index] >> 8);

return (old_pm == new_pm) ? 0 : 1;
}

static void exynos5250_set_frequency(unsigned int old_index,
unsigned int new_index)
{
unsigned int tmp;

if (old_index > new_index) {
if (!exynos5250_pms_change(old_index, new_index)) {
/* 1. Change the system clock divider values */
set_clkdiv(new_index);
/* 2. Change just s value in apll m,p,s value */
tmp = __raw_readl(EXYNOS5_APLL_CON0);
tmp &= ~(0x7 << 0);
tmp |= (exynos5_apll_pms_table[new_index] & 0x7);
__raw_writel(tmp, EXYNOS5_APLL_CON0);

} else {
/* Clock Configuration Procedure */
/* 1. Change the system clock divider values */
set_clkdiv(new_index);
/* 2. Change the apll m,p,s value */
set_apll(new_index, old_index);
}
} else if (old_index < new_index) {
if (!exynos5250_pms_change(old_index, new_index)) {
/* 1. Change just s value in apll m,p,s value */
tmp = __raw_readl(EXYNOS5_APLL_CON0);
tmp &= ~(0x7 << 0);
tmp |= (exynos5_apll_pms_table[new_index] & 0x7);
__raw_writel(tmp, EXYNOS5_APLL_CON0);
/* 2. Change the system clock divider values */
set_clkdiv(new_index);
} else {
/* Clock Configuration Procedure */
/* 1. Change the apll m,p,s value */
set_apll(new_index, old_index);
/* 2. Change the system clock divider values */
set_clkdiv(new_index);
}
}
}

static void __init set_volt_table(void)
{
unsigned int i;

exynos5250_freq_table[L0].frequency = CPUFREQ_ENTRY_INVALID;
exynos5250_freq_table[L1].frequency = CPUFREQ_ENTRY_INVALID;
exynos5250_freq_table[L2].frequency = CPUFREQ_ENTRY_INVALID;
exynos5250_freq_table[L3].frequency = CPUFREQ_ENTRY_INVALID;
exynos5250_freq_table[L4].frequency = CPUFREQ_ENTRY_INVALID;
exynos5250_freq_table[L5].frequency = CPUFREQ_ENTRY_INVALID;
exynos5250_freq_table[L6].frequency = CPUFREQ_ENTRY_INVALID;

max_support_idx = L7;

for (i = 0 ; i < CPUFREQ_LEVEL_END ; i++)
exynos5250_volt_table[i] = asv_voltage_5250[i];
}

int exynos5250_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, "mout_cpu");
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++) {

exynos5250_clkdiv_table[i].index = i;

tmp = __raw_readl(EXYNOS5_CLKDIV_CPU0);

tmp &= ~((0x7 << 0) | (0x7 << 4) | (0x7 << 8) |
(0x7 << 12) | (0x7 << 16) | (0x7 << 20) |
(0x7 << 24) | (0x7 << 28));

tmp |= ((clkdiv_cpu0_5250[i][0] << 0) |
(clkdiv_cpu0_5250[i][1] << 4) |
(clkdiv_cpu0_5250[i][2] << 8) |
(clkdiv_cpu0_5250[i][3] << 12) |
(clkdiv_cpu0_5250[i][4] << 16) |
(clkdiv_cpu0_5250[i][5] << 20) |
(clkdiv_cpu0_5250[i][6] << 24) |
(clkdiv_cpu0_5250[i][7] << 28));

exynos5250_clkdiv_table[i].clkdiv = tmp;

tmp = __raw_readl(EXYNOS5_CLKDIV_CPU1);

tmp &= ~((0x7 << 0) | (0x7 << 4));

tmp |= ((clkdiv_cpu1_5250[i][0] << 0) |
(clkdiv_cpu1_5250[i][1] << 4));

exynos5250_clkdiv_table[i].clkdiv1 = tmp;
}

info->mpll_freq_khz = rate;
/* 1000Mhz */
info->pm_lock_idx = L7;
/* 800Mhz */
info->pll_safe_idx = L9;
info->max_support_idx = max_support_idx;
info->min_support_idx = min_support_idx;
info->cpu_clk = cpu_clk;
info->volt_table = exynos5250_volt_table;
info->freq_table = exynos5250_freq_table;
info->set_freq = exynos5250_set_frequency;
info->need_apll_change = exynos5250_pms_change;

return 0;

err_mout_apll:
clk_put(mout_mpll);
err_mout_mpll:
clk_put(moutcore);
err_moutcore:
clk_put(cpu_clk);

pr_err("%s: failed initialization\n", __func__);
return -EINVAL;
}
EXPORT_SYMBOL(exynos5250_cpufreq_init);

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