diff options
Diffstat (limited to 'drivers/cpufreq/exynos4210-cpufreq.c')
| -rw-r--r-- | drivers/cpufreq/exynos4210-cpufreq.c | 101 |
1 files changed, 65 insertions, 36 deletions
diff --git a/drivers/cpufreq/exynos4210-cpufreq.c b/drivers/cpufreq/exynos4210-cpufreq.c index ba579e0a5c3f..a0af2d4448a9 100644 --- a/drivers/cpufreq/exynos4210-cpufreq.c +++ b/drivers/cpufreq/exynos4210-cpufreq.c @@ -36,6 +36,10 @@ static struct regulator *arm_regulator; static struct cpufreq_freqs freqs; +struct cpufreq_clkdiv { + unsigned int clkdiv; +}; + static unsigned int locking_frequency; static bool frequency_locked; static DEFINE_MUTEX(cpufreq_lock); @@ -44,6 +48,8 @@ enum cpufreq_level_index { L0, L1, L2, L3, L4, CPUFREQ_LEVEL_END, }; +static struct cpufreq_clkdiv exynos4_clkdiv_table[CPUFREQ_LEVEL_END]; + static struct cpufreq_frequency_table exynos4_freq_table[] = { {L0, 1200*1000}, {L1, 1000*1000}, @@ -155,20 +161,7 @@ static void exynos4_set_clkdiv(unsigned int div_index) /* Change Divider - CPU0 */ - tmp = __raw_readl(S5P_CLKDIV_CPU); - - tmp &= ~(S5P_CLKDIV_CPU0_CORE_MASK | S5P_CLKDIV_CPU0_COREM0_MASK | - S5P_CLKDIV_CPU0_COREM1_MASK | S5P_CLKDIV_CPU0_PERIPH_MASK | - S5P_CLKDIV_CPU0_ATB_MASK | S5P_CLKDIV_CPU0_PCLKDBG_MASK | - S5P_CLKDIV_CPU0_APLL_MASK); - - tmp |= ((clkdiv_cpu0[div_index][0] << S5P_CLKDIV_CPU0_CORE_SHIFT) | - (clkdiv_cpu0[div_index][1] << S5P_CLKDIV_CPU0_COREM0_SHIFT) | - (clkdiv_cpu0[div_index][2] << S5P_CLKDIV_CPU0_COREM1_SHIFT) | - (clkdiv_cpu0[div_index][3] << S5P_CLKDIV_CPU0_PERIPH_SHIFT) | - (clkdiv_cpu0[div_index][4] << S5P_CLKDIV_CPU0_ATB_SHIFT) | - (clkdiv_cpu0[div_index][5] << S5P_CLKDIV_CPU0_PCLKDBG_SHIFT) | - (clkdiv_cpu0[div_index][6] << S5P_CLKDIV_CPU0_APLL_SHIFT)); + tmp = exynos4_clkdiv_table[div_index].clkdiv; __raw_writel(tmp, S5P_CLKDIV_CPU); @@ -233,14 +226,12 @@ static void exynos4_set_frequency(unsigned int old_index, unsigned int new_index unsigned int tmp; if (old_index > new_index) { - /* The frequency changing to L0 needs to change apll */ - if (freqs.new == exynos4_freq_table[L0].frequency) { - /* 1. Change the system clock divider values */ - exynos4_set_clkdiv(new_index); - - /* 2. Change the apll m,p,s value */ - exynos4_set_apll(new_index); - } else { + /* + * L1/L3, L2/L4 Level change require + * to only change s divider value + */ + if (((old_index == L3) && (new_index == L1)) || + ((old_index == L4) && (new_index == L2))) { /* 1. Change the system clock divider values */ exynos4_set_clkdiv(new_index); @@ -249,18 +240,20 @@ static void exynos4_set_frequency(unsigned int old_index, unsigned int new_index tmp &= ~(0x7 << 0); tmp |= (exynos4_apll_pms_table[new_index] & 0x7); __raw_writel(tmp, S5P_APLL_CON0); - } - } - - else if (old_index < new_index) { - /* The frequency changing from L0 needs to change apll */ - if (freqs.old == exynos4_freq_table[L0].frequency) { - /* 1. Change the apll m,p,s value */ - exynos4_set_apll(new_index); - - /* 2. Change the system clock divider values */ - exynos4_set_clkdiv(new_index); } else { + /* Clock Configuration Procedure */ + /* 1. Change the system clock divider values */ + exynos4_set_clkdiv(new_index); + /* 2. Change the apll m,p,s value */ + exynos4_set_apll(new_index); + } + } else if (old_index < new_index) { + /* + * L1/L3, L2/L4 Level change require + * to only change s divider value + */ + if (((old_index == L1) && (new_index == L3)) || + ((old_index == L2) && (new_index == L4))) { /* 1. Change just s value in apll m,p,s value */ tmp = __raw_readl(S5P_APLL_CON0); tmp &= ~(0x7 << 0); @@ -269,6 +262,12 @@ static void exynos4_set_frequency(unsigned int old_index, unsigned int new_index /* 2. Change the system clock divider values */ exynos4_set_clkdiv(new_index); + } else { + /* Clock Configuration Procedure */ + /* 1. Change the apll m,p,s value */ + exynos4_set_apll(new_index); + /* 2. Change the system clock divider values */ + exynos4_set_clkdiv(new_index); } } } @@ -320,14 +319,14 @@ static int exynos4_target(struct cpufreq_policy *policy, /* Clock Configuration Procedure */ exynos4_set_frequency(old_index, index); + cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); + /* control regulator */ if (freqs.new < freqs.old) { /* Voltage down */ regulator_set_voltage(arm_regulator, arm_volt, arm_volt); } - cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); - out: mutex_unlock(&cpufreq_lock); return err; @@ -438,7 +437,12 @@ static int exynos4_cpufreq_cpu_init(struct cpufreq_policy *policy) * Each cpu is bound to the same speed. * So the affected cpu is all of the cpus. */ - cpumask_setall(policy->cpus); + if (!cpu_online(1)) { + cpumask_copy(policy->related_cpus, cpu_possible_mask); + cpumask_copy(policy->cpus, cpu_online_mask); + } else { + cpumask_setall(policy->cpus); + } ret = cpufreq_frequency_table_cpuinfo(policy, exynos4_freq_table); if (ret) @@ -477,6 +481,9 @@ static struct cpufreq_driver exynos4_driver = { static int __init exynos4_cpufreq_init(void) { + int i; + unsigned int tmp; + cpu_clk = clk_get(NULL, "armclk"); if (IS_ERR(cpu_clk)) return PTR_ERR(cpu_clk); @@ -503,6 +510,28 @@ static int __init exynos4_cpufreq_init(void) register_pm_notifier(&exynos4_cpufreq_nb); + tmp = __raw_readl(S5P_CLKDIV_CPU); + + for (i = L0; i < CPUFREQ_LEVEL_END; i++) { + tmp &= ~(S5P_CLKDIV_CPU0_CORE_MASK | + S5P_CLKDIV_CPU0_COREM0_MASK | + S5P_CLKDIV_CPU0_COREM1_MASK | + S5P_CLKDIV_CPU0_PERIPH_MASK | + S5P_CLKDIV_CPU0_ATB_MASK | + S5P_CLKDIV_CPU0_PCLKDBG_MASK | + S5P_CLKDIV_CPU0_APLL_MASK); + + tmp |= ((clkdiv_cpu0[i][0] << S5P_CLKDIV_CPU0_CORE_SHIFT) | + (clkdiv_cpu0[i][1] << S5P_CLKDIV_CPU0_COREM0_SHIFT) | + (clkdiv_cpu0[i][2] << S5P_CLKDIV_CPU0_COREM1_SHIFT) | + (clkdiv_cpu0[i][3] << S5P_CLKDIV_CPU0_PERIPH_SHIFT) | + (clkdiv_cpu0[i][4] << S5P_CLKDIV_CPU0_ATB_SHIFT) | + (clkdiv_cpu0[i][5] << S5P_CLKDIV_CPU0_PCLKDBG_SHIFT) | + (clkdiv_cpu0[i][6] << S5P_CLKDIV_CPU0_APLL_SHIFT)); + + exynos4_clkdiv_table[i].clkdiv = tmp; + } + return cpufreq_register_driver(&exynos4_driver); out: |