drivers/cpufreq/exynos4210-cpufreq.c - kernel/windcharger - Git at Google

 /*
  * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
  *		http://www.samsung.com
  *
  * EXYNOS4210 - 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/regs-clock.h>
 #include <mach/cpufreq.h>

 #define CPUFREQ_LEVEL_END	L5

 static int max_support_idx = L0;
 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;
 };

 static unsigned int exynos4210_volt_table[CPUFREQ_LEVEL_END] = {
 	1250000, 1150000, 1050000, 975000, 950000,
 };


 static struct cpufreq_clkdiv exynos4210_clkdiv_table[CPUFREQ_LEVEL_END];

 static struct cpufreq_frequency_table exynos4210_freq_table[] = {
 	{L0, 1200*1000},
 	{L1, 1000*1000},
 	{L2, 800*1000},
 	{L3, 500*1000},
 	{L4, 200*1000},
 	{0, CPUFREQ_TABLE_END},
 };

 static unsigned int clkdiv_cpu0[CPUFREQ_LEVEL_END][7] = {
 	/*
 	 * Clock divider value for following
 	 * { DIVCORE, DIVCOREM0, DIVCOREM1, DIVPERIPH,
 	 *		DIVATB, DIVPCLK_DBG, DIVAPLL }
 	 */

 	/* ARM L0: 1200MHz */
 	{ 0, 3, 7, 3, 4, 1, 7 },

 	/* ARM L1: 1000MHz */
 	{ 0, 3, 7, 3, 4, 1, 7 },

 	/* ARM L2: 800MHz */
 	{ 0, 3, 7, 3, 3, 1, 7 },

 	/* ARM L3: 500MHz */
 	{ 0, 3, 7, 3, 3, 1, 7 },

 	/* ARM L4: 200MHz */
 	{ 0, 1, 3, 1, 3, 1, 0 },
 };

 static unsigned int clkdiv_cpu1[CPUFREQ_LEVEL_END][2] = {
 	/*
 	 * Clock divider value for following
 	 * { DIVCOPY, DIVHPM }
 	 */

 	/* ARM L0: 1200MHz */
 	{ 5, 0 },

 	/* ARM L1: 1000MHz */
 	{ 4, 0 },

 	/* ARM L2: 800MHz */
 	{ 3, 0 },

 	/* ARM L3: 500MHz */
 	{ 3, 0 },

 	/* ARM L4: 200MHz */
 	{ 3, 0 },
 };

 static unsigned int exynos4210_apll_pms_table[CPUFREQ_LEVEL_END] = {
 	/* APLL FOUT L0: 1200MHz */
 	((150 << 16) | (3 << 8) | 1),

 	/* APLL FOUT L1: 1000MHz */
 	((250 << 16) | (6 << 8) | 1),

 	/* APLL FOUT L2: 800MHz */
 	((200 << 16) | (6 << 8) | 1),

 	/* APLL FOUT L3: 500MHz */
 	((250 << 16) | (6 << 8) | 2),

 	/* APLL FOUT L4: 200MHz */
 	((200 << 16) | (6 << 8) | 3),
 };

 static void exynos4210_set_clkdiv(unsigned int div_index)
 {
 	unsigned int tmp;

 	/* Change Divider - CPU0 */

 	tmp = exynos4210_clkdiv_table[div_index].clkdiv;

 	__raw_writel(tmp, S5P_CLKDIV_CPU);

 	do {
 		tmp = __raw_readl(S5P_CLKDIV_STATCPU);
 	} while (tmp & 0x1111111);

 	/* Change Divider - CPU1 */

 	tmp = __raw_readl(S5P_CLKDIV_CPU1);

 	tmp &= ~((0x7 << 4) | 0x7);

 	tmp |= ((clkdiv_cpu1[div_index][0] << 4) |
 		(clkdiv_cpu1[div_index][1] << 0));

 	__raw_writel(tmp, S5P_CLKDIV_CPU1);

 	do {
 		tmp = __raw_readl(S5P_CLKDIV_STATCPU1);
 	} while (tmp & 0x11);
 }

 static void exynos4210_set_apll(unsigned int index)
 {
 	unsigned int tmp;

 	/* 1. MUX_CORE_SEL = MPLL, ARMCLK uses MPLL for lock time */
 	clk_set_parent(moutcore, mout_mpll);

 	do {
 		tmp = (__raw_readl(S5P_CLKMUX_STATCPU)
 			>> S5P_CLKSRC_CPU_MUXCORE_SHIFT);
 		tmp &= 0x7;
 	} while (tmp != 0x2);

 	/* 2. Set APLL Lock time */
 	__raw_writel(S5P_APLL_LOCKTIME, S5P_APLL_LOCK);

 	/* 3. Change PLL PMS values */
 	tmp = __raw_readl(S5P_APLL_CON0);
 	tmp &= ~((0x3ff << 16) | (0x3f << 8) | (0x7 << 0));
 	tmp |= exynos4210_apll_pms_table[index];
 	__raw_writel(tmp, S5P_APLL_CON0);

 	/* 4. wait_lock_time */
 	do {
 		tmp = __raw_readl(S5P_APLL_CON0);
 	} while (!(tmp & (0x1 << S5P_APLLCON0_LOCKED_SHIFT)));

 	/* 5. MUX_CORE_SEL = APLL */
 	clk_set_parent(moutcore, mout_apll);

 	do {
 		tmp = __raw_readl(S5P_CLKMUX_STATCPU);
 		tmp &= S5P_CLKMUX_STATCPU_MUXCORE_MASK;
 	} while (tmp != (0x1 << S5P_CLKSRC_CPU_MUXCORE_SHIFT));
 }

 bool exynos4210_pms_change(unsigned int old_index, unsigned int new_index)
 {
 	unsigned int old_pm = (exynos4210_apll_pms_table[old_index] >> 8);
 	unsigned int new_pm = (exynos4210_apll_pms_table[new_index] >> 8);

 	return (old_pm == new_pm) ? 0 : 1;
 }

 static void exynos4210_set_frequency(unsigned int old_index,
 				     unsigned int new_index)
 {
 	unsigned int tmp;

 	if (old_index > new_index) {
 		if (!exynos4210_pms_change(old_index, new_index)) {
 			/* 1. Change the system clock divider values */
 			exynos4210_set_clkdiv(new_index);

 			/* 2. Change just s value in apll m,p,s value */
 			tmp = __raw_readl(S5P_APLL_CON0);
 			tmp &= ~(0x7 << 0);
 			tmp |= (exynos4210_apll_pms_table[new_index] & 0x7);
 			__raw_writel(tmp, S5P_APLL_CON0);
 		} else {
 			/* Clock Configuration Procedure */
 			/* 1. Change the system clock divider values */
 			exynos4210_set_clkdiv(new_index);
 			/* 2. Change the apll m,p,s value */
 			exynos4210_set_apll(new_index);
 		}
 	} else if (old_index < new_index) {
 		if (!exynos4210_pms_change(old_index, new_index)) {
 			/* 1. Change just s value in apll m,p,s value */
 			tmp = __raw_readl(S5P_APLL_CON0);
 			tmp &= ~(0x7 << 0);
 			tmp |= (exynos4210_apll_pms_table[new_index] & 0x7);
 			__raw_writel(tmp, S5P_APLL_CON0);

 			/* 2. Change the system clock divider values */
 			exynos4210_set_clkdiv(new_index);
 		} else {
 			/* Clock Configuration Procedure */
 			/* 1. Change the apll m,p,s value */
 			exynos4210_set_apll(new_index);
 			/* 2. Change the system clock divider values */
 			exynos4210_set_clkdiv(new_index);
 		}
 	}
 }

 int exynos4210_cpufreq_init(struct exynos_dvfs_info *info)
 {
 	int i;
 	unsigned int tmp;
 	unsigned long rate;

 	cpu_clk = clk_get(NULL, "armclk");
 	if (IS_ERR(cpu_clk))
 		return PTR_ERR(cpu_clk);

 	moutcore = clk_get(NULL, "moutcore");
 	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;

 	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));

 		exynos4210_clkdiv_table[i].clkdiv = tmp;
 	}

 	info->mpll_freq_khz = rate;
 	info->pm_lock_idx = L2;
 	info->pll_safe_idx = L2;
 	info->max_support_idx = max_support_idx;
 	info->min_support_idx = min_support_idx;
 	info->cpu_clk = cpu_clk;
 	info->volt_table = exynos4210_volt_table;
 	info->freq_table = exynos4210_freq_table;
 	info->set_freq = exynos4210_set_frequency;
 	info->need_apll_change = exynos4210_pms_change;

 	return 0;

 err_mout_apll:
 	if (!IS_ERR(mout_mpll))
 		clk_put(mout_mpll);
 err_mout_mpll:
 	if (!IS_ERR(moutcore))
 		clk_put(moutcore);
 err_moutcore:
 	if (!IS_ERR(cpu_clk))
 		clk_put(cpu_clk);

 	pr_debug("%s: failed initialization\n", __func__);
 	return -EINVAL;
 }
 EXPORT_SYMBOL(exynos4210_cpufreq_init);
	/*
	* Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
	* http://www.samsung.com
	*
	* EXYNOS4210 - 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/regs-clock.h>
	#include <mach/cpufreq.h>

	#define CPUFREQ_LEVEL_END L5

	static int max_support_idx = L0;
	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;
	};

	static unsigned int exynos4210_volt_table[CPUFREQ_LEVEL_END] = {
	1250000, 1150000, 1050000, 975000, 950000,
	};


	static struct cpufreq_clkdiv exynos4210_clkdiv_table[CPUFREQ_LEVEL_END];

	static struct cpufreq_frequency_table exynos4210_freq_table[] = {
	{L0, 1200*1000},
	{L1, 1000*1000},
	{L2, 800*1000},
	{L3, 500*1000},
	{L4, 200*1000},
	{0, CPUFREQ_TABLE_END},
	};

	static unsigned int clkdiv_cpu0[CPUFREQ_LEVEL_END][7] = {
	/*
	* Clock divider value for following
	* { DIVCORE, DIVCOREM0, DIVCOREM1, DIVPERIPH,
	* DIVATB, DIVPCLK_DBG, DIVAPLL }
	*/

	/* ARM L0: 1200MHz */
	{ 0, 3, 7, 3, 4, 1, 7 },

	/* ARM L1: 1000MHz */
	{ 0, 3, 7, 3, 4, 1, 7 },

	/* ARM L2: 800MHz */
	{ 0, 3, 7, 3, 3, 1, 7 },

	/* ARM L3: 500MHz */
	{ 0, 3, 7, 3, 3, 1, 7 },

	/* ARM L4: 200MHz */
	{ 0, 1, 3, 1, 3, 1, 0 },
	};

	static unsigned int clkdiv_cpu1[CPUFREQ_LEVEL_END][2] = {
	/*
	* Clock divider value for following
	* { DIVCOPY, DIVHPM }
	*/

	/* ARM L0: 1200MHz */
	{ 5, 0 },

	/* ARM L1: 1000MHz */
	{ 4, 0 },

	/* ARM L2: 800MHz */
	{ 3, 0 },

	/* ARM L3: 500MHz */
	{ 3, 0 },

	/* ARM L4: 200MHz */
	{ 3, 0 },
	};

	static unsigned int exynos4210_apll_pms_table[CPUFREQ_LEVEL_END] = {
	/* APLL FOUT L0: 1200MHz */
	((150 << 16) \| (3 << 8) \| 1),

	/* APLL FOUT L1: 1000MHz */
	((250 << 16) \| (6 << 8) \| 1),

	/* APLL FOUT L2: 800MHz */
	((200 << 16) \| (6 << 8) \| 1),

	/* APLL FOUT L3: 500MHz */
	((250 << 16) \| (6 << 8) \| 2),

	/* APLL FOUT L4: 200MHz */
	((200 << 16) \| (6 << 8) \| 3),
	};

	static void exynos4210_set_clkdiv(unsigned int div_index)
	{
	unsigned int tmp;

	/* Change Divider - CPU0 */

	tmp = exynos4210_clkdiv_table[div_index].clkdiv;

	__raw_writel(tmp, S5P_CLKDIV_CPU);

	do {
	tmp = __raw_readl(S5P_CLKDIV_STATCPU);
	} while (tmp & 0x1111111);

	/* Change Divider - CPU1 */

	tmp = __raw_readl(S5P_CLKDIV_CPU1);

	tmp &= ~((0x7 << 4) \| 0x7);

	tmp \|= ((clkdiv_cpu1[div_index][0] << 4) \|
	(clkdiv_cpu1[div_index][1] << 0));

	__raw_writel(tmp, S5P_CLKDIV_CPU1);

	do {
	tmp = __raw_readl(S5P_CLKDIV_STATCPU1);
	} while (tmp & 0x11);
	}

	static void exynos4210_set_apll(unsigned int index)
	{
	unsigned int tmp;

	/* 1. MUX_CORE_SEL = MPLL, ARMCLK uses MPLL for lock time */
	clk_set_parent(moutcore, mout_mpll);

	do {
	tmp = (__raw_readl(S5P_CLKMUX_STATCPU)
	>> S5P_CLKSRC_CPU_MUXCORE_SHIFT);
	tmp &= 0x7;
	} while (tmp != 0x2);

	/* 2. Set APLL Lock time */
	__raw_writel(S5P_APLL_LOCKTIME, S5P_APLL_LOCK);

	/* 3. Change PLL PMS values */
	tmp = __raw_readl(S5P_APLL_CON0);
	tmp &= ~((0x3ff << 16) \| (0x3f << 8) \| (0x7 << 0));
	tmp \|= exynos4210_apll_pms_table[index];
	__raw_writel(tmp, S5P_APLL_CON0);

	/* 4. wait_lock_time */
	do {
	tmp = __raw_readl(S5P_APLL_CON0);
	} while (!(tmp & (0x1 << S5P_APLLCON0_LOCKED_SHIFT)));

	/* 5. MUX_CORE_SEL = APLL */
	clk_set_parent(moutcore, mout_apll);

	do {
	tmp = __raw_readl(S5P_CLKMUX_STATCPU);
	tmp &= S5P_CLKMUX_STATCPU_MUXCORE_MASK;
	} while (tmp != (0x1 << S5P_CLKSRC_CPU_MUXCORE_SHIFT));
	}

	bool exynos4210_pms_change(unsigned int old_index, unsigned int new_index)
	{
	unsigned int old_pm = (exynos4210_apll_pms_table[old_index] >> 8);
	unsigned int new_pm = (exynos4210_apll_pms_table[new_index] >> 8);

	return (old_pm == new_pm) ? 0 : 1;
	}

	static void exynos4210_set_frequency(unsigned int old_index,
	unsigned int new_index)
	{
	unsigned int tmp;

	if (old_index > new_index) {
	if (!exynos4210_pms_change(old_index, new_index)) {
	/* 1. Change the system clock divider values */
	exynos4210_set_clkdiv(new_index);

	/* 2. Change just s value in apll m,p,s value */
	tmp = __raw_readl(S5P_APLL_CON0);
	tmp &= ~(0x7 << 0);
	tmp \|= (exynos4210_apll_pms_table[new_index] & 0x7);
	__raw_writel(tmp, S5P_APLL_CON0);
	} else {
	/* Clock Configuration Procedure */
	/* 1. Change the system clock divider values */
	exynos4210_set_clkdiv(new_index);
	/* 2. Change the apll m,p,s value */
	exynos4210_set_apll(new_index);
	}
	} else if (old_index < new_index) {
	if (!exynos4210_pms_change(old_index, new_index)) {
	/* 1. Change just s value in apll m,p,s value */
	tmp = __raw_readl(S5P_APLL_CON0);
	tmp &= ~(0x7 << 0);
	tmp \|= (exynos4210_apll_pms_table[new_index] & 0x7);
	__raw_writel(tmp, S5P_APLL_CON0);

	/* 2. Change the system clock divider values */
	exynos4210_set_clkdiv(new_index);
	} else {
	/* Clock Configuration Procedure */
	/* 1. Change the apll m,p,s value */
	exynos4210_set_apll(new_index);
	/* 2. Change the system clock divider values */
	exynos4210_set_clkdiv(new_index);
	}
	}
	}

	int exynos4210_cpufreq_init(struct exynos_dvfs_info *info)
	{
	int i;
	unsigned int tmp;
	unsigned long rate;

	cpu_clk = clk_get(NULL, "armclk");
	if (IS_ERR(cpu_clk))
	return PTR_ERR(cpu_clk);

	moutcore = clk_get(NULL, "moutcore");
	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;

	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));

	exynos4210_clkdiv_table[i].clkdiv = tmp;
	}

	info->mpll_freq_khz = rate;
	info->pm_lock_idx = L2;
	info->pll_safe_idx = L2;
	info->max_support_idx = max_support_idx;
	info->min_support_idx = min_support_idx;
	info->cpu_clk = cpu_clk;
	info->volt_table = exynos4210_volt_table;
	info->freq_table = exynos4210_freq_table;
	info->set_freq = exynos4210_set_frequency;
	info->need_apll_change = exynos4210_pms_change;

	return 0;

	err_mout_apll:
	if (!IS_ERR(mout_mpll))
	clk_put(mout_mpll);
	err_mout_mpll:
	if (!IS_ERR(moutcore))
	clk_put(moutcore);
	err_moutcore:
	if (!IS_ERR(cpu_clk))
	clk_put(cpu_clk);

	pr_debug("%s: failed initialization\n", __func__);
	return -EINVAL;
	}
	EXPORT_SYMBOL(exynos4210_cpufreq_init);