arch/arm/mach-mvebu/pmsu.c - arm/linux-arm64-legacy - Git at Google

 /*
  * Power Management Service Unit(PMSU) support for Armada 370/XP platforms.
  *
  * Copyright (C) 2012 Marvell
  *
  * Yehuda Yitschak <yehuday@marvell.com>
  * Gregory Clement <gregory.clement@free-electrons.com>
  * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
  *
  * This file is licensed under the terms of the GNU General Public
  * License version 2.  This program is licensed "as is" without any
  * warranty of any kind, whether express or implied.
  *
  * The Armada 370 and Armada XP SOCs have a power management service
  * unit which is responsible for powering down and waking up CPUs and
  * other SOC units
  */

 #define pr_fmt(fmt) "mvebu-pmsu: " fmt

 #include <linux/cpu_pm.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/of_address.h>
 #include <linux/io.h>
 #include <linux/platform_device.h>
 #include <linux/smp.h>
 #include <linux/resource.h>
 #include <asm/cacheflush.h>
 #include <asm/cp15.h>
 #include <asm/smp_plat.h>
 #include <asm/suspend.h>
 #include <asm/tlbflush.h>
 #include "common.h"

 static void __iomem *pmsu_mp_base;

 #define PMSU_BASE_OFFSET    0x100
 #define PMSU_REG_SIZE	    0x1000

 /* PMSU MP registers */
 #define PMSU_CONTROL_AND_CONFIG(cpu)	    ((cpu * 0x100) + 0x104)
 #define PMSU_CONTROL_AND_CONFIG_DFS_REQ		BIT(18)
 #define PMSU_CONTROL_AND_CONFIG_PWDDN_REQ	BIT(16)
 #define PMSU_CONTROL_AND_CONFIG_L2_PWDDN	BIT(20)

 #define PMSU_CPU_POWER_DOWN_CONTROL(cpu)    ((cpu * 0x100) + 0x108)

 #define PMSU_CPU_POWER_DOWN_DIS_SNP_Q_SKIP	BIT(0)

 #define PMSU_STATUS_AND_MASK(cpu)	    ((cpu * 0x100) + 0x10c)
 #define PMSU_STATUS_AND_MASK_CPU_IDLE_WAIT	BIT(16)
 #define PMSU_STATUS_AND_MASK_SNP_Q_EMPTY_WAIT	BIT(17)
 #define PMSU_STATUS_AND_MASK_IRQ_WAKEUP		BIT(20)
 #define PMSU_STATUS_AND_MASK_FIQ_WAKEUP		BIT(21)
 #define PMSU_STATUS_AND_MASK_DBG_WAKEUP		BIT(22)
 #define PMSU_STATUS_AND_MASK_IRQ_MASK		BIT(24)
 #define PMSU_STATUS_AND_MASK_FIQ_MASK		BIT(25)

 #define PMSU_BOOT_ADDR_REDIRECT_OFFSET(cpu) ((cpu * 0x100) + 0x124)

 /* PMSU fabric registers */
 #define L2C_NFABRIC_PM_CTL		    0x4
 #define L2C_NFABRIC_PM_CTL_PWR_DOWN		BIT(20)

 extern void ll_disable_coherency(void);
 extern void ll_enable_coherency(void);

 extern void armada_370_xp_cpu_resume(void);

 static struct platform_device armada_xp_cpuidle_device = {
 	.name = "cpuidle-armada-370-xp",
 };

 static struct of_device_id of_pmsu_table[] = {
 	{ .compatible = "marvell,armada-370-pmsu", },
 	{ .compatible = "marvell,armada-370-xp-pmsu", },
 	{ .compatible = "marvell,armada-380-pmsu", },
 	{ /* end of list */ },
 };

 void mvebu_pmsu_set_cpu_boot_addr(int hw_cpu, void *boot_addr)
 {
 	writel(virt_to_phys(boot_addr), pmsu_mp_base +
 		PMSU_BOOT_ADDR_REDIRECT_OFFSET(hw_cpu));
 }

 static int __init armada_370_xp_pmsu_init(void)
 {
 	struct device_node *np;
 	struct resource res;
 	int ret = 0;

 	np = of_find_matching_node(NULL, of_pmsu_table);
 	if (!np)
 		return 0;

 	pr_info("Initializing Power Management Service Unit\n");

 	if (of_address_to_resource(np, 0, &res)) {
 		pr_err("unable to get resource\n");
 		ret = -ENOENT;
 		goto out;
 	}

 	if (of_device_is_compatible(np, "marvell,armada-370-xp-pmsu")) {
 		pr_warn(FW_WARN "deprecated pmsu binding\n");
 		res.start = res.start - PMSU_BASE_OFFSET;
 		res.end = res.start + PMSU_REG_SIZE - 1;
 	}

 	if (!request_mem_region(res.start, resource_size(&res),
 				np->full_name)) {
 		pr_err("unable to request region\n");
 		ret = -EBUSY;
 		goto out;
 	}

 	pmsu_mp_base = ioremap(res.start, resource_size(&res));
 	if (!pmsu_mp_base) {
 		pr_err("unable to map registers\n");
 		release_mem_region(res.start, resource_size(&res));
 		ret = -ENOMEM;
 		goto out;
 	}

  out:
 	of_node_put(np);
 	return ret;
 }

 static void armada_370_xp_pmsu_enable_l2_powerdown_onidle(void)
 {
 	u32 reg;

 	if (pmsu_mp_base == NULL)
 		return;

 	/* Enable L2 & Fabric powerdown in Deep-Idle mode - Fabric */
 	reg = readl(pmsu_mp_base + L2C_NFABRIC_PM_CTL);
 	reg |= L2C_NFABRIC_PM_CTL_PWR_DOWN;
 	writel(reg, pmsu_mp_base + L2C_NFABRIC_PM_CTL);
 }

 /* No locking is needed because we only access per-CPU registers */
 void armada_370_xp_pmsu_idle_prepare(bool deepidle)
 {
 	unsigned int hw_cpu = cpu_logical_map(smp_processor_id());
 	u32 reg;

 	if (pmsu_mp_base == NULL)
 		return;

 	/*
 	 * Adjust the PMSU configuration to wait for WFI signal, enable
 	 * IRQ and FIQ as wakeup events, set wait for snoop queue empty
 	 * indication and mask IRQ and FIQ from CPU
 	 */
 	reg = readl(pmsu_mp_base + PMSU_STATUS_AND_MASK(hw_cpu));
 	reg |= PMSU_STATUS_AND_MASK_CPU_IDLE_WAIT    |
 	       PMSU_STATUS_AND_MASK_IRQ_WAKEUP       |
 	       PMSU_STATUS_AND_MASK_FIQ_WAKEUP       |
 	       PMSU_STATUS_AND_MASK_SNP_Q_EMPTY_WAIT |
 	       PMSU_STATUS_AND_MASK_IRQ_MASK         |
 	       PMSU_STATUS_AND_MASK_FIQ_MASK;
 	writel(reg, pmsu_mp_base + PMSU_STATUS_AND_MASK(hw_cpu));

 	reg = readl(pmsu_mp_base + PMSU_CONTROL_AND_CONFIG(hw_cpu));
 	/* ask HW to power down the L2 Cache if needed */
 	if (deepidle)
 		reg |= PMSU_CONTROL_AND_CONFIG_L2_PWDDN;

 	/* request power down */
 	reg |= PMSU_CONTROL_AND_CONFIG_PWDDN_REQ;
 	writel(reg, pmsu_mp_base + PMSU_CONTROL_AND_CONFIG(hw_cpu));

 	/* Disable snoop disable by HW - SW is taking care of it */
 	reg = readl(pmsu_mp_base + PMSU_CPU_POWER_DOWN_CONTROL(hw_cpu));
 	reg |= PMSU_CPU_POWER_DOWN_DIS_SNP_Q_SKIP;
 	writel(reg, pmsu_mp_base + PMSU_CPU_POWER_DOWN_CONTROL(hw_cpu));
 }

 static noinline int do_armada_370_xp_cpu_suspend(unsigned long deepidle)
 {
 	armada_370_xp_pmsu_idle_prepare(deepidle);

 	v7_exit_coherency_flush(all);

 	ll_disable_coherency();

 	dsb();

 	wfi();

 	/* If we are here, wfi failed. As processors run out of
 	 * coherency for some time, tlbs might be stale, so flush them
 	 */
 	local_flush_tlb_all();

 	ll_enable_coherency();

 	/* Test the CR_C bit and set it if it was cleared */
 	asm volatile(
 	"mrc	p15, 0, r0, c1, c0, 0 \n\t"
 	"tst	r0, #(1 << 2) \n\t"
 	"orreq	r0, r0, #(1 << 2) \n\t"
 	"mcreq	p15, 0, r0, c1, c0, 0 \n\t"
 	"isb	"
 	: : : "r0");

 	pr_warn("Failed to suspend the system\n");

 	return 0;
 }

 static int armada_370_xp_cpu_suspend(unsigned long deepidle)
 {
 	return cpu_suspend(deepidle, do_armada_370_xp_cpu_suspend);
 }

 /* No locking is needed because we only access per-CPU registers */
 static noinline void armada_370_xp_pmsu_idle_restore(void)
 {
 	unsigned int hw_cpu = cpu_logical_map(smp_processor_id());
 	u32 reg;

 	if (pmsu_mp_base == NULL)
 		return;

 	/* cancel ask HW to power down the L2 Cache if possible */
 	reg = readl(pmsu_mp_base + PMSU_CONTROL_AND_CONFIG(hw_cpu));
 	reg &= ~PMSU_CONTROL_AND_CONFIG_L2_PWDDN;
 	writel(reg, pmsu_mp_base + PMSU_CONTROL_AND_CONFIG(hw_cpu));

 	/* cancel Enable wakeup events and mask interrupts */
 	reg = readl(pmsu_mp_base + PMSU_STATUS_AND_MASK(hw_cpu));
 	reg &= ~(PMSU_STATUS_AND_MASK_IRQ_WAKEUP | PMSU_STATUS_AND_MASK_FIQ_WAKEUP);
 	reg &= ~PMSU_STATUS_AND_MASK_CPU_IDLE_WAIT;
 	reg &= ~PMSU_STATUS_AND_MASK_SNP_Q_EMPTY_WAIT;
 	reg &= ~(PMSU_STATUS_AND_MASK_IRQ_MASK | PMSU_STATUS_AND_MASK_FIQ_MASK);
 	writel(reg, pmsu_mp_base + PMSU_STATUS_AND_MASK(hw_cpu));
 }

 static int armada_370_xp_cpu_pm_notify(struct notifier_block *self,
 				    unsigned long action, void *hcpu)
 {
 	if (action == CPU_PM_ENTER) {
 		unsigned int hw_cpu = cpu_logical_map(smp_processor_id());
 		mvebu_pmsu_set_cpu_boot_addr(hw_cpu, armada_370_xp_cpu_resume);
 	} else if (action == CPU_PM_EXIT) {
 		armada_370_xp_pmsu_idle_restore();
 	}

 	return NOTIFY_OK;
 }

 static struct notifier_block armada_370_xp_cpu_pm_notifier = {
 	.notifier_call = armada_370_xp_cpu_pm_notify,
 };

 int __init armada_370_xp_cpu_pm_init(void)
 {
 	struct device_node *np;

 	/*
 	 * Check that all the requirements are available to enable
 	 * cpuidle. So far, it is only supported on Armada XP, cpuidle
 	 * needs the coherency fabric and the PMSU enabled
 	 */

 	if (!of_machine_is_compatible("marvell,armadaxp"))
 		return 0;

 	np = of_find_compatible_node(NULL, NULL, "marvell,coherency-fabric");
 	if (!np)
 		return 0;
 	of_node_put(np);

 	np = of_find_matching_node(NULL, of_pmsu_table);
 	if (!np)
 		return 0;
 	of_node_put(np);

 	armada_370_xp_pmsu_enable_l2_powerdown_onidle();
 	armada_xp_cpuidle_device.dev.platform_data = armada_370_xp_cpu_suspend;
 	platform_device_register(&armada_xp_cpuidle_device);
 	cpu_pm_register_notifier(&armada_370_xp_cpu_pm_notifier);

 	return 0;
 }

 arch_initcall(armada_370_xp_cpu_pm_init);
 early_initcall(armada_370_xp_pmsu_init);
	/*
	* Power Management Service Unit(PMSU) support for Armada 370/XP platforms.
	*
	* Copyright (C) 2012 Marvell
	*
	* Yehuda Yitschak <yehuday@marvell.com>
	* Gregory Clement <gregory.clement@free-electrons.com>
	* Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
	*
	* This file is licensed under the terms of the GNU General Public
	* License version 2. This program is licensed "as is" without any
	* warranty of any kind, whether express or implied.
	*
	* The Armada 370 and Armada XP SOCs have a power management service
	* unit which is responsible for powering down and waking up CPUs and
	* other SOC units
	*/

	#define pr_fmt(fmt) "mvebu-pmsu: " fmt

	#include <linux/cpu_pm.h>
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/of_address.h>
	#include <linux/io.h>
	#include <linux/platform_device.h>
	#include <linux/smp.h>
	#include <linux/resource.h>
	#include <asm/cacheflush.h>
	#include <asm/cp15.h>
	#include <asm/smp_plat.h>
	#include <asm/suspend.h>
	#include <asm/tlbflush.h>
	#include "common.h"

	static void __iomem *pmsu_mp_base;

	#define PMSU_BASE_OFFSET 0x100
	#define PMSU_REG_SIZE 0x1000

	/* PMSU MP registers */
	#define PMSU_CONTROL_AND_CONFIG(cpu) ((cpu * 0x100) + 0x104)
	#define PMSU_CONTROL_AND_CONFIG_DFS_REQ BIT(18)
	#define PMSU_CONTROL_AND_CONFIG_PWDDN_REQ BIT(16)
	#define PMSU_CONTROL_AND_CONFIG_L2_PWDDN BIT(20)

	#define PMSU_CPU_POWER_DOWN_CONTROL(cpu) ((cpu * 0x100) + 0x108)

	#define PMSU_CPU_POWER_DOWN_DIS_SNP_Q_SKIP BIT(0)

	#define PMSU_STATUS_AND_MASK(cpu) ((cpu * 0x100) + 0x10c)
	#define PMSU_STATUS_AND_MASK_CPU_IDLE_WAIT BIT(16)
	#define PMSU_STATUS_AND_MASK_SNP_Q_EMPTY_WAIT BIT(17)
	#define PMSU_STATUS_AND_MASK_IRQ_WAKEUP BIT(20)
	#define PMSU_STATUS_AND_MASK_FIQ_WAKEUP BIT(21)
	#define PMSU_STATUS_AND_MASK_DBG_WAKEUP BIT(22)
	#define PMSU_STATUS_AND_MASK_IRQ_MASK BIT(24)
	#define PMSU_STATUS_AND_MASK_FIQ_MASK BIT(25)

	#define PMSU_BOOT_ADDR_REDIRECT_OFFSET(cpu) ((cpu * 0x100) + 0x124)

	/* PMSU fabric registers */
	#define L2C_NFABRIC_PM_CTL 0x4
	#define L2C_NFABRIC_PM_CTL_PWR_DOWN BIT(20)

	extern void ll_disable_coherency(void);
	extern void ll_enable_coherency(void);

	extern void armada_370_xp_cpu_resume(void);

	static struct platform_device armada_xp_cpuidle_device = {
	.name = "cpuidle-armada-370-xp",
	};

	static struct of_device_id of_pmsu_table[] = {
	{ .compatible = "marvell,armada-370-pmsu", },
	{ .compatible = "marvell,armada-370-xp-pmsu", },
	{ .compatible = "marvell,armada-380-pmsu", },
	{ /* end of list */ },
	};

	void mvebu_pmsu_set_cpu_boot_addr(int hw_cpu, void *boot_addr)
	{
	writel(virt_to_phys(boot_addr), pmsu_mp_base +
	PMSU_BOOT_ADDR_REDIRECT_OFFSET(hw_cpu));
	}

	static int __init armada_370_xp_pmsu_init(void)
	{
	struct device_node *np;
	struct resource res;
	int ret = 0;

	np = of_find_matching_node(NULL, of_pmsu_table);
	if (!np)
	return 0;

	pr_info("Initializing Power Management Service Unit\n");

	if (of_address_to_resource(np, 0, &res)) {
	pr_err("unable to get resource\n");
	ret = -ENOENT;
	goto out;
	}

	if (of_device_is_compatible(np, "marvell,armada-370-xp-pmsu")) {
	pr_warn(FW_WARN "deprecated pmsu binding\n");
	res.start = res.start - PMSU_BASE_OFFSET;
	res.end = res.start + PMSU_REG_SIZE - 1;
	}

	if (!request_mem_region(res.start, resource_size(&res),
	np->full_name)) {
	pr_err("unable to request region\n");
	ret = -EBUSY;
	goto out;
	}

	pmsu_mp_base = ioremap(res.start, resource_size(&res));
	if (!pmsu_mp_base) {
	pr_err("unable to map registers\n");
	release_mem_region(res.start, resource_size(&res));
	ret = -ENOMEM;
	goto out;
	}

	out:
	of_node_put(np);
	return ret;
	}

	static void armada_370_xp_pmsu_enable_l2_powerdown_onidle(void)
	{
	u32 reg;

	if (pmsu_mp_base == NULL)
	return;

	/* Enable L2 & Fabric powerdown in Deep-Idle mode - Fabric */
	reg = readl(pmsu_mp_base + L2C_NFABRIC_PM_CTL);
	reg \|= L2C_NFABRIC_PM_CTL_PWR_DOWN;
	writel(reg, pmsu_mp_base + L2C_NFABRIC_PM_CTL);
	}

	/* No locking is needed because we only access per-CPU registers */
	void armada_370_xp_pmsu_idle_prepare(bool deepidle)
	{
	unsigned int hw_cpu = cpu_logical_map(smp_processor_id());
	u32 reg;

	if (pmsu_mp_base == NULL)
	return;

	/*
	* Adjust the PMSU configuration to wait for WFI signal, enable
	* IRQ and FIQ as wakeup events, set wait for snoop queue empty
	* indication and mask IRQ and FIQ from CPU
	*/
	reg = readl(pmsu_mp_base + PMSU_STATUS_AND_MASK(hw_cpu));
	reg \|= PMSU_STATUS_AND_MASK_CPU_IDLE_WAIT \|
	PMSU_STATUS_AND_MASK_IRQ_WAKEUP \|
	PMSU_STATUS_AND_MASK_FIQ_WAKEUP \|
	PMSU_STATUS_AND_MASK_SNP_Q_EMPTY_WAIT \|
	PMSU_STATUS_AND_MASK_IRQ_MASK \|
	PMSU_STATUS_AND_MASK_FIQ_MASK;
	writel(reg, pmsu_mp_base + PMSU_STATUS_AND_MASK(hw_cpu));

	reg = readl(pmsu_mp_base + PMSU_CONTROL_AND_CONFIG(hw_cpu));
	/* ask HW to power down the L2 Cache if needed */
	if (deepidle)
	reg \|= PMSU_CONTROL_AND_CONFIG_L2_PWDDN;

	/* request power down */
	reg \|= PMSU_CONTROL_AND_CONFIG_PWDDN_REQ;
	writel(reg, pmsu_mp_base + PMSU_CONTROL_AND_CONFIG(hw_cpu));

	/* Disable snoop disable by HW - SW is taking care of it */
	reg = readl(pmsu_mp_base + PMSU_CPU_POWER_DOWN_CONTROL(hw_cpu));
	reg \|= PMSU_CPU_POWER_DOWN_DIS_SNP_Q_SKIP;
	writel(reg, pmsu_mp_base + PMSU_CPU_POWER_DOWN_CONTROL(hw_cpu));
	}

	static noinline int do_armada_370_xp_cpu_suspend(unsigned long deepidle)
	{
	armada_370_xp_pmsu_idle_prepare(deepidle);

	v7_exit_coherency_flush(all);

	ll_disable_coherency();

	dsb();

	wfi();

	/* If we are here, wfi failed. As processors run out of
	* coherency for some time, tlbs might be stale, so flush them
	*/
	local_flush_tlb_all();

	ll_enable_coherency();

	/* Test the CR_C bit and set it if it was cleared */
	asm volatile(
	"mrc p15, 0, r0, c1, c0, 0 \n\t"
	"tst r0, #(1 << 2) \n\t"
	"orreq r0, r0, #(1 << 2) \n\t"
	"mcreq p15, 0, r0, c1, c0, 0 \n\t"
	"isb "
	: : : "r0");

	pr_warn("Failed to suspend the system\n");

	return 0;
	}

	static int armada_370_xp_cpu_suspend(unsigned long deepidle)
	{
	return cpu_suspend(deepidle, do_armada_370_xp_cpu_suspend);
	}

	/* No locking is needed because we only access per-CPU registers */
	static noinline void armada_370_xp_pmsu_idle_restore(void)
	{
	unsigned int hw_cpu = cpu_logical_map(smp_processor_id());
	u32 reg;

	if (pmsu_mp_base == NULL)
	return;

	/* cancel ask HW to power down the L2 Cache if possible */
	reg = readl(pmsu_mp_base + PMSU_CONTROL_AND_CONFIG(hw_cpu));
	reg &= ~PMSU_CONTROL_AND_CONFIG_L2_PWDDN;
	writel(reg, pmsu_mp_base + PMSU_CONTROL_AND_CONFIG(hw_cpu));

	/* cancel Enable wakeup events and mask interrupts */
	reg = readl(pmsu_mp_base + PMSU_STATUS_AND_MASK(hw_cpu));
	reg &= ~(PMSU_STATUS_AND_MASK_IRQ_WAKEUP \| PMSU_STATUS_AND_MASK_FIQ_WAKEUP);
	reg &= ~PMSU_STATUS_AND_MASK_CPU_IDLE_WAIT;
	reg &= ~PMSU_STATUS_AND_MASK_SNP_Q_EMPTY_WAIT;
	reg &= ~(PMSU_STATUS_AND_MASK_IRQ_MASK \| PMSU_STATUS_AND_MASK_FIQ_MASK);
	writel(reg, pmsu_mp_base + PMSU_STATUS_AND_MASK(hw_cpu));
	}

	static int armada_370_xp_cpu_pm_notify(struct notifier_block *self,
	unsigned long action, void *hcpu)
	{
	if (action == CPU_PM_ENTER) {
	unsigned int hw_cpu = cpu_logical_map(smp_processor_id());
	mvebu_pmsu_set_cpu_boot_addr(hw_cpu, armada_370_xp_cpu_resume);
	} else if (action == CPU_PM_EXIT) {
	armada_370_xp_pmsu_idle_restore();
	}

	return NOTIFY_OK;
	}

	static struct notifier_block armada_370_xp_cpu_pm_notifier = {
	.notifier_call = armada_370_xp_cpu_pm_notify,
	};

	int __init armada_370_xp_cpu_pm_init(void)
	{
	struct device_node *np;

	/*
	* Check that all the requirements are available to enable
	* cpuidle. So far, it is only supported on Armada XP, cpuidle
	* needs the coherency fabric and the PMSU enabled
	*/

	if (!of_machine_is_compatible("marvell,armadaxp"))
	return 0;

	np = of_find_compatible_node(NULL, NULL, "marvell,coherency-fabric");
	if (!np)
	return 0;
	of_node_put(np);

	np = of_find_matching_node(NULL, of_pmsu_table);
	if (!np)
	return 0;
	of_node_put(np);

	armada_370_xp_pmsu_enable_l2_powerdown_onidle();
	armada_xp_cpuidle_device.dev.platform_data = armada_370_xp_cpu_suspend;
	platform_device_register(&armada_xp_cpuidle_device);
	cpu_pm_register_notifier(&armada_370_xp_cpu_pm_notifier);

	return 0;
	}

	arch_initcall(armada_370_xp_cpu_pm_init);
	early_initcall(armada_370_xp_pmsu_init);