diff options
Diffstat (limited to 'kernel/drivers/cpufreq/exynos5250-cpufreq.c')
| -rw-r--r-- | kernel/drivers/cpufreq/exynos5250-cpufreq.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/kernel/drivers/cpufreq/exynos5250-cpufreq.c b/kernel/drivers/cpufreq/exynos5250-cpufreq.c new file mode 100644 index 000000000..3eafdc7ba --- /dev/null +++ b/kernel/drivers/cpufreq/exynos5250-cpufreq.c @@ -0,0 +1,210 @@ +/* + * 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 <linux/of.h> +#include <linux/of_address.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 struct exynos_dvfs_info *cpufreq; + +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[] = { + {0, L0, 1700 * 1000}, + {0, L1, 1600 * 1000}, + {0, L2, 1500 * 1000}, + {0, L3, 1400 * 1000}, + {0, L4, 1300 * 1000}, + {0, L5, 1200 * 1000}, + {0, L6, 1100 * 1000}, + {0, L7, 1000 * 1000}, + {0, L8, 900 * 1000}, + {0, L9, 800 * 1000}, + {0, L10, 700 * 1000}, + {0, L11, 600 * 1000}, + {0, L12, 500 * 1000}, + {0, L13, 400 * 1000}, + {0, L14, 300 * 1000}, + {0, L15, 200 * 1000}, + {0, 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, cpufreq->cmu_regs + EXYNOS5_CLKDIV_CPU0); + + while (__raw_readl(cpufreq->cmu_regs + EXYNOS5_CLKDIV_STATCPU0) + & 0x11111111) + cpu_relax(); + + /* Change Divider - CPU1 */ + tmp = apll_freq_5250[div_index].clk_div_cpu1; + + __raw_writel(tmp, cpufreq->cmu_regs + EXYNOS5_CLKDIV_CPU1); + + while (__raw_readl(cpufreq->cmu_regs + EXYNOS5_CLKDIV_STATCPU1) & 0x11) + cpu_relax(); +} + +static void set_apll(unsigned int index) +{ + unsigned int tmp; + unsigned int freq = apll_freq_5250[index].freq; + + /* MUX_CORE_SEL = MPLL, ARMCLK uses MPLL for lock time */ + clk_set_parent(moutcore, mout_mpll); + + do { + cpu_relax(); + tmp = (__raw_readl(cpufreq->cmu_regs + EXYNOS5_CLKMUX_STATCPU) + >> 16); + tmp &= 0x7; + } while (tmp != 0x2); + + clk_set_rate(mout_apll, freq * 1000); + + /* MUX_CORE_SEL = APLL */ + clk_set_parent(moutcore, mout_apll); + + do { + cpu_relax(); + tmp = __raw_readl(cpufreq->cmu_regs + EXYNOS5_CLKMUX_STATCPU); + tmp &= (0x7 << 16); + } while (tmp != (0x1 << 16)); +} + +static void exynos5250_set_frequency(unsigned int old_index, + unsigned int new_index) +{ + if (old_index > new_index) { + set_clkdiv(new_index); + set_apll(new_index); + } else if (old_index < new_index) { + set_apll(new_index); + set_clkdiv(new_index); + } +} + +int exynos5250_cpufreq_init(struct exynos_dvfs_info *info) +{ + struct device_node *np; + unsigned long rate; + + /* + * HACK: This is a temporary workaround to get access to clock + * controller registers directly and remove static mappings and + * dependencies on platform headers. It is necessary to enable + * Exynos multi-platform support and will be removed together with + * this whole driver as soon as Exynos gets migrated to use + * cpufreq-dt driver. + */ + np = of_find_compatible_node(NULL, NULL, "samsung,exynos5250-clock"); + if (!np) { + pr_err("%s: failed to find clock controller DT node\n", + __func__); + return -ENODEV; + } + + info->cmu_regs = of_iomap(np, 0); + if (!info->cmu_regs) { + pr_err("%s: failed to map CMU registers\n", __func__); + return -EFAULT; + } + + 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; + + cpufreq = info; + + 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; +} |