arch/arm/mach-tegra/pmc.c - maze/linux - Git at Google

 /*
  * Copyright (C) 2012,2013 NVIDIA CORPORATION. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
  * version 2, as published by the Free Software Foundation.
  *
  * This program is distributed in the hope it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  * more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */

 #include <linux/kernel.h>
 #include <linux/clk.h>
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/of_address.h>

 #include "fuse.h"
 #include "pm.h"
 #include "pmc.h"
 #include "sleep.h"

 #define TEGRA_POWER_EFFECT_LP0		(1 << 14)  /* LP0 when CPU pwr gated */
 #define TEGRA_POWER_CPU_PWRREQ_POLARITY	(1 << 15)  /* CPU pwr req polarity */
 #define TEGRA_POWER_CPU_PWRREQ_OE	(1 << 16)  /* CPU pwr req enable */

 #define PMC_CTRL			0x0
 #define PMC_CTRL_INTR_LOW		(1 << 17)
 #define PMC_PWRGATE_TOGGLE		0x30
 #define PMC_PWRGATE_TOGGLE_START	(1 << 8)
 #define PMC_REMOVE_CLAMPING		0x34
 #define PMC_PWRGATE_STATUS		0x38

 #define PMC_CPUPWRGOOD_TIMER	0xc8
 #define PMC_CPUPWROFF_TIMER	0xcc

 #define TEGRA_POWERGATE_PCIE	3
 #define TEGRA_POWERGATE_VDEC	4
 #define TEGRA_POWERGATE_CPU1	9
 #define TEGRA_POWERGATE_CPU2	10
 #define TEGRA_POWERGATE_CPU3	11

 static u8 tegra_cpu_domains[] = {
 	0xFF,			/* not available for CPU0 */
 	TEGRA_POWERGATE_CPU1,
 	TEGRA_POWERGATE_CPU2,
 	TEGRA_POWERGATE_CPU3,
 };
 static DEFINE_SPINLOCK(tegra_powergate_lock);

 static void __iomem *tegra_pmc_base;
 static bool tegra_pmc_invert_interrupt;
 static struct clk *tegra_pclk;

 struct pmc_pm_data {
 	u32 cpu_good_time;	/* CPU power good time in uS */
 	u32 cpu_off_time;	/* CPU power off time in uS */
 	u32 core_osc_time;	/* Core power good osc time in uS */
 	u32 core_pmu_time;	/* Core power good pmu time in uS */
 	u32 core_off_time;	/* Core power off time in uS */
 	bool corereq_high;	/* Core power request active-high */
 	bool sysclkreq_high;	/* System clock request active-high */
 	bool combined_req;	/* Combined pwr req for CPU & Core */
 	bool cpu_pwr_good_en;	/* CPU power good signal is enabled */
 	u32 lp0_vec_phy_addr;	/* The phy addr of LP0 warm boot code */
 	u32 lp0_vec_size;	/* The size of LP0 warm boot code */
 	enum tegra_suspend_mode suspend_mode;
 };
 static struct pmc_pm_data pmc_pm_data;

 static inline u32 tegra_pmc_readl(u32 reg)
 {
 	return readl(tegra_pmc_base + reg);
 }

 static inline void tegra_pmc_writel(u32 val, u32 reg)
 {
 	writel(val, tegra_pmc_base + reg);
 }

 static int tegra_pmc_get_cpu_powerdomain_id(int cpuid)
 {
 	if (cpuid <= 0 || cpuid >= num_possible_cpus())
 		return -EINVAL;
 	return tegra_cpu_domains[cpuid];
 }

 static bool tegra_pmc_powergate_is_powered(int id)
 {
 	return (tegra_pmc_readl(PMC_PWRGATE_STATUS) >> id) & 1;
 }

 static int tegra_pmc_powergate_set(int id, bool new_state)
 {
 	bool old_state;
 	unsigned long flags;

 	spin_lock_irqsave(&tegra_powergate_lock, flags);

 	old_state = tegra_pmc_powergate_is_powered(id);
 	WARN_ON(old_state == new_state);

 	tegra_pmc_writel(PMC_PWRGATE_TOGGLE_START | id, PMC_PWRGATE_TOGGLE);

 	spin_unlock_irqrestore(&tegra_powergate_lock, flags);

 	return 0;
 }

 static int tegra_pmc_powergate_remove_clamping(int id)
 {
 	u32 mask;

 	/*
 	 * Tegra has a bug where PCIE and VDE clamping masks are
 	 * swapped relatively to the partition ids.
 	 */
 	if (id ==  TEGRA_POWERGATE_VDEC)
 		mask = (1 << TEGRA_POWERGATE_PCIE);
 	else if	(id == TEGRA_POWERGATE_PCIE)
 		mask = (1 << TEGRA_POWERGATE_VDEC);
 	else
 		mask = (1 << id);

 	tegra_pmc_writel(mask, PMC_REMOVE_CLAMPING);

 	return 0;
 }

 bool tegra_pmc_cpu_is_powered(int cpuid)
 {
 	int id;

 	id = tegra_pmc_get_cpu_powerdomain_id(cpuid);
 	if (id < 0)
 		return false;
 	return tegra_pmc_powergate_is_powered(id);
 }

 int tegra_pmc_cpu_power_on(int cpuid)
 {
 	int id;

 	id = tegra_pmc_get_cpu_powerdomain_id(cpuid);
 	if (id < 0)
 		return id;
 	return tegra_pmc_powergate_set(id, true);
 }

 int tegra_pmc_cpu_remove_clamping(int cpuid)
 {
 	int id;

 	id = tegra_pmc_get_cpu_powerdomain_id(cpuid);
 	if (id < 0)
 		return id;
 	return tegra_pmc_powergate_remove_clamping(id);
 }

 #ifdef CONFIG_PM_SLEEP
 static void set_power_timers(u32 us_on, u32 us_off, unsigned long rate)
 {
 	unsigned long long ticks;
 	unsigned long long pclk;
 	static unsigned long tegra_last_pclk;

 	if (WARN_ON_ONCE(rate <= 0))
 		pclk = 100000000;
 	else
 		pclk = rate;

 	if ((rate != tegra_last_pclk)) {
 		ticks = (us_on * pclk) + 999999ull;
 		do_div(ticks, 1000000);
 		tegra_pmc_writel((unsigned long)ticks, PMC_CPUPWRGOOD_TIMER);

 		ticks = (us_off * pclk) + 999999ull;
 		do_div(ticks, 1000000);
 		tegra_pmc_writel((unsigned long)ticks, PMC_CPUPWROFF_TIMER);
 		wmb();
 	}
 	tegra_last_pclk = pclk;
 }

 enum tegra_suspend_mode tegra_pmc_get_suspend_mode(void)
 {
 	return pmc_pm_data.suspend_mode;
 }

 void tegra_pmc_pm_set(enum tegra_suspend_mode mode)
 {
 	u32 reg;
 	unsigned long rate = 0;

 	reg = tegra_pmc_readl(PMC_CTRL);
 	reg |= TEGRA_POWER_CPU_PWRREQ_OE;
 	reg &= ~TEGRA_POWER_EFFECT_LP0;

 	switch (mode) {
 	case TEGRA_SUSPEND_LP2:
 		rate = clk_get_rate(tegra_pclk);
 		break;
 	default:
 		break;
 	}

 	set_power_timers(pmc_pm_data.cpu_good_time, pmc_pm_data.cpu_off_time,
 			 rate);

 	tegra_pmc_writel(reg, PMC_CTRL);
 }

 void tegra_pmc_suspend_init(void)
 {
 	u32 reg;

 	/* Always enable CPU power request */
 	reg = tegra_pmc_readl(PMC_CTRL);
 	reg |= TEGRA_POWER_CPU_PWRREQ_OE;
 	tegra_pmc_writel(reg, PMC_CTRL);
 }
 #endif

 static const struct of_device_id matches[] __initconst = {
 	{ .compatible = "nvidia,tegra114-pmc" },
 	{ .compatible = "nvidia,tegra30-pmc" },
 	{ .compatible = "nvidia,tegra20-pmc" },
 	{ }
 };

 static void __init tegra_pmc_parse_dt(void)
 {
 	struct device_node *np;
 	u32 prop;
 	enum tegra_suspend_mode suspend_mode;
 	u32 core_good_time[2] = {0, 0};
 	u32 lp0_vec[2] = {0, 0};

 	np = of_find_matching_node(NULL, matches);
 	BUG_ON(!np);

 	tegra_pmc_base = of_iomap(np, 0);

 	tegra_pmc_invert_interrupt = of_property_read_bool(np,
 				     "nvidia,invert-interrupt");
 	tegra_pclk = of_clk_get_by_name(np, "pclk");
 	WARN_ON(IS_ERR(tegra_pclk));

 	/* Grabbing the power management configurations */
 	if (of_property_read_u32(np, "nvidia,suspend-mode", &prop)) {
 		suspend_mode = TEGRA_SUSPEND_NONE;
 	} else {
 		switch (prop) {
 		case 0:
 			suspend_mode = TEGRA_SUSPEND_LP0;
 			break;
 		case 1:
 			suspend_mode = TEGRA_SUSPEND_LP1;
 			break;
 		case 2:
 			suspend_mode = TEGRA_SUSPEND_LP2;
 			break;
 		default:
 			suspend_mode = TEGRA_SUSPEND_NONE;
 			break;
 		}
 	}
 	suspend_mode = tegra_pm_validate_suspend_mode(suspend_mode);

 	if (of_property_read_u32(np, "nvidia,cpu-pwr-good-time", &prop))
 		suspend_mode = TEGRA_SUSPEND_NONE;
 	pmc_pm_data.cpu_good_time = prop;

 	if (of_property_read_u32(np, "nvidia,cpu-pwr-off-time", &prop))
 		suspend_mode = TEGRA_SUSPEND_NONE;
 	pmc_pm_data.cpu_off_time = prop;

 	if (of_property_read_u32_array(np, "nvidia,core-pwr-good-time",
 			core_good_time, ARRAY_SIZE(core_good_time)))
 		suspend_mode = TEGRA_SUSPEND_NONE;
 	pmc_pm_data.core_osc_time = core_good_time[0];
 	pmc_pm_data.core_pmu_time = core_good_time[1];

 	if (of_property_read_u32(np, "nvidia,core-pwr-off-time",
 				 &prop))
 		suspend_mode = TEGRA_SUSPEND_NONE;
 	pmc_pm_data.core_off_time = prop;

 	pmc_pm_data.corereq_high = of_property_read_bool(np,
 				"nvidia,core-power-req-active-high");

 	pmc_pm_data.sysclkreq_high = of_property_read_bool(np,
 				"nvidia,sys-clock-req-active-high");

 	pmc_pm_data.combined_req = of_property_read_bool(np,
 				"nvidia,combined-power-req");

 	pmc_pm_data.cpu_pwr_good_en = of_property_read_bool(np,
 				"nvidia,cpu-pwr-good-en");

 	if (of_property_read_u32_array(np, "nvidia,lp0-vec", lp0_vec,
 				       ARRAY_SIZE(lp0_vec)))
 		if (suspend_mode == TEGRA_SUSPEND_LP0)
 			suspend_mode = TEGRA_SUSPEND_LP1;

 	pmc_pm_data.lp0_vec_phy_addr = lp0_vec[0];
 	pmc_pm_data.lp0_vec_size = lp0_vec[1];

 	pmc_pm_data.suspend_mode = suspend_mode;
 }

 void __init tegra_pmc_init(void)
 {
 	u32 val;

 	tegra_pmc_parse_dt();

 	val = tegra_pmc_readl(PMC_CTRL);
 	if (tegra_pmc_invert_interrupt)
 		val |= PMC_CTRL_INTR_LOW;
 	else
 		val &= ~PMC_CTRL_INTR_LOW;
 	tegra_pmc_writel(val, PMC_CTRL);
 }
	/*
	* Copyright (C) 2012,2013 NVIDIA CORPORATION. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms and conditions of the GNU General Public License,
	* version 2, as published by the Free Software Foundation.
	*
	* This program is distributed in the hope it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	* more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*
	*/

	#include <linux/kernel.h>
	#include <linux/clk.h>
	#include <linux/io.h>
	#include <linux/of.h>
	#include <linux/of_address.h>

	#include "fuse.h"
	#include "pm.h"
	#include "pmc.h"
	#include "sleep.h"

	#define TEGRA_POWER_EFFECT_LP0 (1 << 14) /* LP0 when CPU pwr gated */
	#define TEGRA_POWER_CPU_PWRREQ_POLARITY (1 << 15) /* CPU pwr req polarity */
	#define TEGRA_POWER_CPU_PWRREQ_OE (1 << 16) /* CPU pwr req enable */

	#define PMC_CTRL 0x0
	#define PMC_CTRL_INTR_LOW (1 << 17)
	#define PMC_PWRGATE_TOGGLE 0x30
	#define PMC_PWRGATE_TOGGLE_START (1 << 8)
	#define PMC_REMOVE_CLAMPING 0x34
	#define PMC_PWRGATE_STATUS 0x38

	#define PMC_CPUPWRGOOD_TIMER 0xc8
	#define PMC_CPUPWROFF_TIMER 0xcc

	#define TEGRA_POWERGATE_PCIE 3
	#define TEGRA_POWERGATE_VDEC 4
	#define TEGRA_POWERGATE_CPU1 9
	#define TEGRA_POWERGATE_CPU2 10
	#define TEGRA_POWERGATE_CPU3 11

	static u8 tegra_cpu_domains[] = {
	0xFF, /* not available for CPU0 */
	TEGRA_POWERGATE_CPU1,
	TEGRA_POWERGATE_CPU2,
	TEGRA_POWERGATE_CPU3,
	};
	static DEFINE_SPINLOCK(tegra_powergate_lock);

	static void __iomem *tegra_pmc_base;
	static bool tegra_pmc_invert_interrupt;
	static struct clk *tegra_pclk;

	struct pmc_pm_data {
	u32 cpu_good_time; /* CPU power good time in uS */
	u32 cpu_off_time; /* CPU power off time in uS */
	u32 core_osc_time; /* Core power good osc time in uS */
	u32 core_pmu_time; /* Core power good pmu time in uS */
	u32 core_off_time; /* Core power off time in uS */
	bool corereq_high; /* Core power request active-high */
	bool sysclkreq_high; /* System clock request active-high */
	bool combined_req; /* Combined pwr req for CPU & Core */
	bool cpu_pwr_good_en; /* CPU power good signal is enabled */
	u32 lp0_vec_phy_addr; /* The phy addr of LP0 warm boot code */
	u32 lp0_vec_size; /* The size of LP0 warm boot code */
	enum tegra_suspend_mode suspend_mode;
	};
	static struct pmc_pm_data pmc_pm_data;

	static inline u32 tegra_pmc_readl(u32 reg)
	{
	return readl(tegra_pmc_base + reg);
	}

	static inline void tegra_pmc_writel(u32 val, u32 reg)
	{
	writel(val, tegra_pmc_base + reg);
	}

	static int tegra_pmc_get_cpu_powerdomain_id(int cpuid)
	{
	if (cpuid <= 0 \|\| cpuid >= num_possible_cpus())
	return -EINVAL;
	return tegra_cpu_domains[cpuid];
	}

	static bool tegra_pmc_powergate_is_powered(int id)
	{
	return (tegra_pmc_readl(PMC_PWRGATE_STATUS) >> id) & 1;
	}

	static int tegra_pmc_powergate_set(int id, bool new_state)
	{
	bool old_state;
	unsigned long flags;

	spin_lock_irqsave(&tegra_powergate_lock, flags);

	old_state = tegra_pmc_powergate_is_powered(id);
	WARN_ON(old_state == new_state);

	tegra_pmc_writel(PMC_PWRGATE_TOGGLE_START \| id, PMC_PWRGATE_TOGGLE);

	spin_unlock_irqrestore(&tegra_powergate_lock, flags);

	return 0;
	}

	static int tegra_pmc_powergate_remove_clamping(int id)
	{
	u32 mask;

	/*
	* Tegra has a bug where PCIE and VDE clamping masks are
	* swapped relatively to the partition ids.
	*/
	if (id == TEGRA_POWERGATE_VDEC)
	mask = (1 << TEGRA_POWERGATE_PCIE);
	else if (id == TEGRA_POWERGATE_PCIE)
	mask = (1 << TEGRA_POWERGATE_VDEC);
	else
	mask = (1 << id);

	tegra_pmc_writel(mask, PMC_REMOVE_CLAMPING);

	return 0;
	}

	bool tegra_pmc_cpu_is_powered(int cpuid)
	{
	int id;

	id = tegra_pmc_get_cpu_powerdomain_id(cpuid);
	if (id < 0)
	return false;
	return tegra_pmc_powergate_is_powered(id);
	}

	int tegra_pmc_cpu_power_on(int cpuid)
	{
	int id;

	id = tegra_pmc_get_cpu_powerdomain_id(cpuid);
	if (id < 0)
	return id;
	return tegra_pmc_powergate_set(id, true);
	}

	int tegra_pmc_cpu_remove_clamping(int cpuid)
	{
	int id;

	id = tegra_pmc_get_cpu_powerdomain_id(cpuid);
	if (id < 0)
	return id;
	return tegra_pmc_powergate_remove_clamping(id);
	}

	#ifdef CONFIG_PM_SLEEP
	static void set_power_timers(u32 us_on, u32 us_off, unsigned long rate)
	{
	unsigned long long ticks;
	unsigned long long pclk;
	static unsigned long tegra_last_pclk;

	if (WARN_ON_ONCE(rate <= 0))
	pclk = 100000000;
	else
	pclk = rate;

	if ((rate != tegra_last_pclk)) {
	ticks = (us_on * pclk) + 999999ull;
	do_div(ticks, 1000000);
	tegra_pmc_writel((unsigned long)ticks, PMC_CPUPWRGOOD_TIMER);

	ticks = (us_off * pclk) + 999999ull;
	do_div(ticks, 1000000);
	tegra_pmc_writel((unsigned long)ticks, PMC_CPUPWROFF_TIMER);
	wmb();
	}
	tegra_last_pclk = pclk;
	}

	enum tegra_suspend_mode tegra_pmc_get_suspend_mode(void)
	{
	return pmc_pm_data.suspend_mode;
	}

	void tegra_pmc_pm_set(enum tegra_suspend_mode mode)
	{
	u32 reg;
	unsigned long rate = 0;

	reg = tegra_pmc_readl(PMC_CTRL);
	reg \|= TEGRA_POWER_CPU_PWRREQ_OE;
	reg &= ~TEGRA_POWER_EFFECT_LP0;

	switch (mode) {
	case TEGRA_SUSPEND_LP2:
	rate = clk_get_rate(tegra_pclk);
	break;
	default:
	break;
	}

	set_power_timers(pmc_pm_data.cpu_good_time, pmc_pm_data.cpu_off_time,
	rate);

	tegra_pmc_writel(reg, PMC_CTRL);
	}

	void tegra_pmc_suspend_init(void)
	{
	u32 reg;

	/* Always enable CPU power request */
	reg = tegra_pmc_readl(PMC_CTRL);
	reg \|= TEGRA_POWER_CPU_PWRREQ_OE;
	tegra_pmc_writel(reg, PMC_CTRL);
	}
	#endif

	static const struct of_device_id matches[] __initconst = {
	{ .compatible = "nvidia,tegra114-pmc" },
	{ .compatible = "nvidia,tegra30-pmc" },
	{ .compatible = "nvidia,tegra20-pmc" },
	{ }
	};

	static void __init tegra_pmc_parse_dt(void)
	{
	struct device_node *np;
	u32 prop;
	enum tegra_suspend_mode suspend_mode;
	u32 core_good_time[2] = {0, 0};
	u32 lp0_vec[2] = {0, 0};

	np = of_find_matching_node(NULL, matches);
	BUG_ON(!np);

	tegra_pmc_base = of_iomap(np, 0);

	tegra_pmc_invert_interrupt = of_property_read_bool(np,
	"nvidia,invert-interrupt");
	tegra_pclk = of_clk_get_by_name(np, "pclk");
	WARN_ON(IS_ERR(tegra_pclk));

	/* Grabbing the power management configurations */
	if (of_property_read_u32(np, "nvidia,suspend-mode", &prop)) {
	suspend_mode = TEGRA_SUSPEND_NONE;
	} else {
	switch (prop) {
	case 0:
	suspend_mode = TEGRA_SUSPEND_LP0;
	break;
	case 1:
	suspend_mode = TEGRA_SUSPEND_LP1;
	break;
	case 2:
	suspend_mode = TEGRA_SUSPEND_LP2;
	break;
	default:
	suspend_mode = TEGRA_SUSPEND_NONE;
	break;
	}
	}
	suspend_mode = tegra_pm_validate_suspend_mode(suspend_mode);

	if (of_property_read_u32(np, "nvidia,cpu-pwr-good-time", &prop))
	suspend_mode = TEGRA_SUSPEND_NONE;
	pmc_pm_data.cpu_good_time = prop;

	if (of_property_read_u32(np, "nvidia,cpu-pwr-off-time", &prop))
	suspend_mode = TEGRA_SUSPEND_NONE;
	pmc_pm_data.cpu_off_time = prop;

	if (of_property_read_u32_array(np, "nvidia,core-pwr-good-time",
	core_good_time, ARRAY_SIZE(core_good_time)))
	suspend_mode = TEGRA_SUSPEND_NONE;
	pmc_pm_data.core_osc_time = core_good_time[0];
	pmc_pm_data.core_pmu_time = core_good_time[1];

	if (of_property_read_u32(np, "nvidia,core-pwr-off-time",
	&prop))
	suspend_mode = TEGRA_SUSPEND_NONE;
	pmc_pm_data.core_off_time = prop;

	pmc_pm_data.corereq_high = of_property_read_bool(np,
	"nvidia,core-power-req-active-high");

	pmc_pm_data.sysclkreq_high = of_property_read_bool(np,
	"nvidia,sys-clock-req-active-high");

	pmc_pm_data.combined_req = of_property_read_bool(np,
	"nvidia,combined-power-req");

	pmc_pm_data.cpu_pwr_good_en = of_property_read_bool(np,
	"nvidia,cpu-pwr-good-en");

	if (of_property_read_u32_array(np, "nvidia,lp0-vec", lp0_vec,
	ARRAY_SIZE(lp0_vec)))
	if (suspend_mode == TEGRA_SUSPEND_LP0)
	suspend_mode = TEGRA_SUSPEND_LP1;

	pmc_pm_data.lp0_vec_phy_addr = lp0_vec[0];
	pmc_pm_data.lp0_vec_size = lp0_vec[1];

	pmc_pm_data.suspend_mode = suspend_mode;
	}

	void __init tegra_pmc_init(void)
	{
	u32 val;

	tegra_pmc_parse_dt();

	val = tegra_pmc_readl(PMC_CTRL);
	if (tegra_pmc_invert_interrupt)
	val \|= PMC_CTRL_INTR_LOW;
	else
	val &= ~PMC_CTRL_INTR_LOW;
	tegra_pmc_writel(val, PMC_CTRL);
	}