--- /dev/null
+/*
+ * 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);
projects / karo-tx-linux.git / blobdiff