diff options
Diffstat (limited to 'drivers/cpufreq/exynos5250-cpufreq.c')
| -rw-r--r-- | drivers/cpufreq/exynos5250-cpufreq.c | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/drivers/cpufreq/exynos5250-cpufreq.c b/drivers/cpufreq/exynos5250-cpufreq.c new file mode 100644 index 00000000..9fae466d --- /dev/null +++ b/drivers/cpufreq/exynos5250-cpufreq.c @@ -0,0 +1,239 @@ +/* + * 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 "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 exynos5250_volt_table[] = { + 1300000, 1250000, 1225000, 1200000, 1150000, + 1125000, 1100000, 1075000, 1050000, 1025000, + 1012500, 1000000, 975000, 950000, 937500, + 925000 +}; + +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 apll_freq apll_freq_5250[] = { + /* + * values: + * freq + * clock divider for ARM, CPUD, ACP, PERIPH, ATB, PCLK_DBG, APLL, ARM2 + * clock divider for COPY, HPM, RESERVED + * PLL M, P, S + */ + APLL_FREQ(1700, 0, 3, 7, 7, 7, 3, 5, 0, 0, 2, 0, 425, 6, 0), + APLL_FREQ(1600, 0, 3, 7, 7, 7, 1, 4, 0, 0, 2, 0, 200, 3, 0), + APLL_FREQ(1500, 0, 2, 7, 7, 7, 1, 4, 0, 0, 2, 0, 250, 4, 0), + APLL_FREQ(1400, 0, 2, 7, 7, 6, 1, 4, 0, 0, 2, 0, 175, 3, 0), + APLL_FREQ(1300, 0, 2, 7, 7, 6, 1, 3, 0, 0, 2, 0, 325, 6, 0), + APLL_FREQ(1200, 0, 2, 7, 7, 5, 1, 3, 0, 0, 2, 0, 200, 4, 0), + APLL_FREQ(1100, 0, 3, 7, 7, 5, 1, 3, 0, 0, 2, 0, 275, 6, 0), + APLL_FREQ(1000, 0, 1, 7, 7, 4, 1, 2, 0, 0, 2, 0, 125, 3, 0), + APLL_FREQ(900, 0, 1, 7, 7, 4, 1, 2, 0, 0, 2, 0, 150, 4, 0), + APLL_FREQ(800, 0, 1, 7, 7, 4, 1, 2, 0, 0, 2, 0, 100, 3, 0), + APLL_FREQ(700, 0, 1, 7, 7, 3, 1, 1, 0, 0, 2, 0, 175, 3, 1), + APLL_FREQ(600, 0, 1, 7, 7, 3, 1, 1, 0, 0, 2, 0, 200, 4, 1), + APLL_FREQ(500, 0, 1, 7, 7, 2, 1, 1, 0, 0, 2, 0, 125, 3, 1), + APLL_FREQ(400, 0, 1, 7, 7, 2, 1, 1, 0, 0, 2, 0, 100, 3, 1), + APLL_FREQ(300, 0, 1, 7, 7, 1, 1, 1, 0, 0, 2, 0, 200, 4, 2), + APLL_FREQ(200, 0, 1, 7, 7, 1, 1, 1, 0, 0, 2, 0, 100, 3, 2), +}; + +static void set_clkdiv(unsigned int div_index) +{ + unsigned int tmp; + + /* Change Divider - CPU0 */ + + tmp = apll_freq_5250[div_index].clk_div_cpu0; + + __raw_writel(tmp, EXYNOS5_CLKDIV_CPU0); + + while (__raw_readl(EXYNOS5_CLKDIV_STATCPU0) & 0x11111111) + cpu_relax(); + + /* Change Divider - CPU1 */ + tmp = apll_freq_5250[div_index].clk_div_cpu1; + + __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 = ((apll_freq_5250[new_index].mps >> 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 |= apll_freq_5250[new_index].mps; + __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)); + +} + +static bool exynos5250_pms_change(unsigned int old_index, unsigned int new_index) +{ + unsigned int old_pm = apll_freq_5250[old_index].mps >> 8; + unsigned int new_pm = apll_freq_5250[new_index].mps >> 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 |= apll_freq_5250[new_index].mps & 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 |= apll_freq_5250[new_index].mps & 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); + } + } +} + +int exynos5250_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, "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; + + info->mpll_freq_khz = rate; + /* 800Mhz */ + info->pll_safe_idx = L9; + 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); |