From: Jaecheol Lee <jc....@samsung.com>
This patch adds support ASV on Exynos4210. Exynos4 CPUFREQ
driver uses Adaptive Supply Voltage to configure voltage table.
Signed-off-by: Jaecheol Lee <jc....@samsung.com>
---
arch/arm/mach-exynos4/include/mach/cpufreq.h | 7 +++
drivers/cpufreq/exynos4210-cpufreq.c | 76
+++++++++++++++++---------
2 files changed, 57 insertions(+), 26 deletions(-)
diff --git a/arch/arm/mach-exynos4/include/mach/cpufreq.h
b/arch/arm/mach-exynos4/include/mach/cpufreq.h
index 7e00931..16bb3e9 100644
--- a/arch/arm/mach-exynos4/include/mach/cpufreq.h
+++ b/arch/arm/mach-exynos4/include/mach/cpufreq.h
@@ -37,3 +37,10 @@ enum cpufreq_lock_ID {
int exynos4_cpufreq_lock(unsigned int nId,
enum cpufreq_level_request cpufreq_level);
void exynos4_cpufreq_lock_free(unsigned int nId);
+
+#define SUPPORT_1400MHZ (1 << 31)
+#define SUPPORT_1200MHZ (1 << 30)
+#define SUPPORT_1000MHZ (1 << 29)
+
+#define SUPPORT_FREQ_SHIFT 29
+#define SUPPORT_FREQ_MASK 7
diff --git a/drivers/cpufreq/exynos4210-cpufreq.c
b/drivers/cpufreq/exynos4210-cpufreq.c
index 30e1949..8dcd9b1 100644
--- a/drivers/cpufreq/exynos4210-cpufreq.c
+++ b/drivers/cpufreq/exynos4210-cpufreq.c
@@ -60,6 +60,8 @@ static struct cpufreq_frequency_table exynos4_freq_table[]
= {
{0, CPUFREQ_TABLE_END},
};
+static unsigned int exynos4_volt_table[CPUFREQ_LEVEL_END];
+
/* This defines are for cpufreq lock */
#define CPUFREQ_MIN_LEVEL (CPUFREQ_LEVEL_END - 1)
unsigned int cpufreq_lock_id;
@@ -111,30 +113,6 @@ static unsigned int clkdiv_cpu1[CPUFREQ_LEVEL_END][2] =
{
{ 3, 0 },
};
-struct cpufreq_voltage_table {
- unsigned int index; /* any */
- unsigned int arm_volt; /* uV */
-};
-
-static struct cpufreq_voltage_table exynos4_volt_table[CPUFREQ_LEVEL_END] =
{
- {
- .index = L0,
- .arm_volt = 1350000,
- }, {
- .index = L1,
- .arm_volt = 1300000,
- }, {
- .index = L2,
- .arm_volt = 1200000,
- }, {
- .index = L3,
- .arm_volt = 1100000,
- }, {
- .index = L4,
- .arm_volt = 1050000,
- },
-};
-
static unsigned int exynos4_apll_pms_table[CPUFREQ_LEVEL_END] = {
/* APLL FOUT L0: 1200MHz */
((150 << 16) | (3 << 8) | 1),
@@ -152,6 +130,26 @@ static unsigned int
exynos4_apll_pms_table[CPUFREQ_LEVEL_END] = {
((200 << 16) | (6 << 8) | 3),
};
+/*
+ * ASV group voltage table
+ */
+static const unsigned int asv_voltage[CPUFREQ_LEVEL_END][8] = {
+ /*
+ * SS, A1, A2, B1, B2, C1, C2, D
+ * @1200 :
+ * @1000 :
+ * @800 : ASV_VOLTAGE_TABLE
+ * @500 :
+ * @200 :
+ */
+ { 1350000, 1350000, 1300000, 1275000, 1250000, 1225000, 1200000,
1175000 },
+ { 1300000, 1250000, 1200000, 1175000, 1150000, 1125000, 1100000,
1075000 },
+ { 1200000, 1150000, 1100000, 1075000, 1050000, 1025000, 1000000,
975000 },
+ { 1100000, 1050000, 1000000, 975000, 975000, 950000, 925000, 925000
},
+ { 1050000, 1000000, 975000, 950000, 950000, 925000, 925000, 925000
},
+
+};
+
static int exynos4_verify_speed(struct cpufreq_policy *policy)
{
return cpufreq_frequency_table_verify(policy, exynos4_freq_table);
@@ -312,7 +310,7 @@ static int exynos4_target(struct cpufreq_policy *policy,
}
/* get the voltage value */
- arm_volt = exynos4_volt_table[index].arm_volt;
+ arm_volt = exynos4_volt_table[index];
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
@@ -392,7 +390,7 @@ int exynos4_cpufreq_lock(unsigned int id,
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
/* get the voltage value */
- arm_volt = exynos4_volt_table[cpufreq_level].arm_volt;
+ arm_volt = exynos4_volt_table[cpufreq_level];
regulator_set_voltage(arm_regulator, arm_volt,
arm_volt);
@@ -518,11 +516,37 @@ static struct cpufreq_driver exynos4_driver = {
#endif
};
+static void __init set_volt_table(void)
+{
+ unsigned int tmp, i, asv_group = 0;
+
+ tmp = __raw_readl(S5P_INFORM2);
+
+ switch (tmp & (SUPPORT_FREQ_MASK << SUPPORT_FREQ_SHIFT)) {
+ case SUPPORT_1200MHZ:
+ asv_group = (tmp & 0xF);
+ break;
+ case SUPPORT_1400MHZ:
+ case SUPPORT_1000MHZ:
+ default:
+ /* Not supported and assign typical ASV group */
+ asv_group = 2;
+ break;
+ }
+
+ printk(KERN_INFO "DVFS: VDD_ARM Voltage table set with %d Group\n",
asv_group);
+
+ for (i = 0 ; i < CPUFREQ_LEVEL_END ; i++)
+ exynos4_volt_table[i] = asv_voltage[i][asv_group];
+}
+
static int __init exynos4_cpufreq_init(void)
{
int i;
unsigned int tmp;
+ set_volt_table();
+
cpu_clk = clk_get(NULL, "armclk");
if (IS_ERR(cpu_clk))
return PTR_ERR(cpu_clk);
--
1.7.1
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