Release 4.11 arch/arm/mach-exynos/platsmp.c

/*
 * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
 *              http://www.samsung.com
 *
 * Cloned from linux/arch/arm/mach-vexpress/platsmp.c
 *
 *  Copyright (C) 2002 ARM Ltd.
 *  All Rights Reserved
 *
 * 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/init.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/jiffies.h>
#include <linux/smp.h>
#include <linux/io.h>
#include <linux/of_address.h>
#include <linux/soc/samsung/exynos-regs-pmu.h>

#include <asm/cacheflush.h>
#include <asm/cp15.h>
#include <asm/smp_plat.h>
#include <asm/smp_scu.h>
#include <asm/firmware.h>

#include <mach/map.h>

#include "common.h"

extern void exynos4_secondary_startup(void);

#ifdef CONFIG_HOTPLUG_CPU


static inline void cpu_leave_lowpower(u32 core_id)
{
	unsigned int v;

	asm volatile(
        "mrc    p15, 0, %0, c1, c0, 0\n"
        "       orr     %0, %0, %1\n"
        "       mcr     p15, 0, %0, c1, c0, 0\n"
        "       mrc     p15, 0, %0, c1, c0, 1\n"
        "       orr     %0, %0, %2\n"
        "       mcr     p15, 0, %0, c1, c0, 1\n"
          : "=&r" (v)
          : "Ir" (CR_C), "Ir" (0x40)
          : "cc");
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Krzysztof Kozlowski
17
100.00%
2
100.00%
Total
17
100.00%
2
100.00%



static inline void platform_do_lowpower(unsigned int cpu, int *spurious)
{
	u32 mpidr = cpu_logical_map(cpu);
	u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);

	for (;;) {

		/* Turn the CPU off on next WFI instruction. */
		exynos_cpu_power_down(core_id);

		wfi();

		if (pen_release == core_id) {
			/*
                         * OK, proper wakeup, we're done
                         */
			break;
		}

		/*
                 * Getting here, means that we have come out of WFI without
                 * having been woken up - this shouldn't happen
                 *
                 * Just note it happening - when we're woken, we can report
                 * its occurrence.
                 */
		(*spurious)++;
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Krzysztof Kozlowski
66
100.00%
1
100.00%
Total
66
100.00%
1
100.00%

#endif /* CONFIG_HOTPLUG_CPU */

/**
 * exynos_core_power_down : power down the specified cpu
 * @cpu : the cpu to power down
 *
 * Power down the specified cpu. The sequence must be finished by a
 * call to cpu_do_idle()
 *
 */


void exynos_cpu_power_down(int cpu)
{
	u32 core_conf;

	if (cpu == 0 && (soc_is_exynos5420() || soc_is_exynos5800())) {
		/*
                 * Bypass power down for CPU0 during suspend. Check for
                 * the SYS_PWR_REG value to decide if we are suspending
                 * the system.
                 */
		int val = pmu_raw_readl(EXYNOS5_ARM_CORE0_SYS_PWR_REG);

		if (!(val & S5P_CORE_LOCAL_PWR_EN))
			return;
	}

	core_conf = pmu_raw_readl(EXYNOS_ARM_CORE_CONFIGURATION(cpu));
	core_conf &= ~S5P_CORE_LOCAL_PWR_EN;
	pmu_raw_writel(core_conf, EXYNOS_ARM_CORE_CONFIGURATION(cpu));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Abhilash Kesavan
31
43.66%
1
20.00%
Krzysztof Kozlowski
20
28.17%
2
40.00%
Bartlomiej Zolnierkiewicz
19
26.76%
1
20.00%
Arnd Bergmann
1
1.41%
1
20.00%
Total
71
100.00%
5
100.00%

/**
 * exynos_cpu_power_up : power up the specified cpu
 * @cpu : the cpu to power up
 *
 * Power up the specified cpu
 */


void exynos_cpu_power_up(int cpu)
{
	u32 core_conf = S5P_CORE_LOCAL_PWR_EN;

	if (soc_is_exynos3250())
		core_conf |= S5P_CORE_AUTOWAKEUP_EN;

	pmu_raw_writel(core_conf,
			EXYNOS_ARM_CORE_CONFIGURATION(cpu));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Krzysztof Kozlowski
16
50.00%
1
33.33%
Bartlomiej Zolnierkiewicz
15
46.88%
1
33.33%
Arnd Bergmann
1
3.12%
1
33.33%
Total
32
100.00%
3
100.00%

/**
 * exynos_cpu_power_state : returns the power state of the cpu
 * @cpu : the cpu to retrieve the power state from
 *
 */


int exynos_cpu_power_state(int cpu)
{
	return (pmu_raw_readl(EXYNOS_ARM_CORE_STATUS(cpu)) &
			S5P_CORE_LOCAL_PWR_EN);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Krzysztof Kozlowski
20
95.24%
1
50.00%
Arnd Bergmann
1
4.76%
1
50.00%
Total
21
100.00%
2
100.00%

/**
 * exynos_cluster_power_down : power down the specified cluster
 * @cluster : the cluster to power down
 */


void exynos_cluster_power_down(int cluster)
{
	pmu_raw_writel(0, EXYNOS_COMMON_CONFIGURATION(cluster));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Krzysztof Kozlowski
17
94.44%
1
50.00%
Arnd Bergmann
1
5.56%
1
50.00%
Total
18
100.00%
2
100.00%

/**
 * exynos_cluster_power_up : power up the specified cluster
 * @cluster : the cluster to power up
 */


void exynos_cluster_power_up(int cluster)
{
	pmu_raw_writel(S5P_CORE_LOCAL_PWR_EN,
			EXYNOS_COMMON_CONFIGURATION(cluster));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Krzysztof Kozlowski
17
94.44%
1
50.00%
Arnd Bergmann
1
5.56%
1
50.00%
Total
18
100.00%
2
100.00%

/**
 * exynos_cluster_power_state : returns the power state of the cluster
 * @cluster : the cluster to retrieve the power state from
 *
 */


int exynos_cluster_power_state(int cluster)
{
	return (pmu_raw_readl(EXYNOS_COMMON_STATUS(cluster)) &
		S5P_CORE_LOCAL_PWR_EN);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Krzysztof Kozlowski
20
95.24%
1
50.00%
Arnd Bergmann
1
4.76%
1
50.00%
Total
21
100.00%
2
100.00%



static void __iomem *cpu_boot_reg_base(void)
{
	if (soc_is_exynos4210() && samsung_rev() == EXYNOS4210_REV_1_1)
		return pmu_base_addr + S5P_INFORM5;
	return sysram_base_addr;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tomasz Figa
24
85.71%
1
25.00%
Pankaj Dubey
2
7.14%
1
25.00%
Sachin Kamat
1
3.57%
1
25.00%
Bartlomiej Zolnierkiewicz
1
3.57%
1
25.00%
Total
28
100.00%
4
100.00%



static inline void __iomem *cpu_boot_reg(int cpu)
{
	void __iomem *boot_reg;

	boot_reg = cpu_boot_reg_base();
	if (!boot_reg)
		return IOMEM_ERR_PTR(-ENODEV);
	if (soc_is_exynos4412())
		boot_reg += 4*cpu;
	else if (soc_is_exynos5420() || soc_is_exynos5800())
		boot_reg += 4;
	return boot_reg;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tomasz Figa
36
59.02%
1
20.00%
Sachin Kamat
11
18.03%
1
20.00%
Chander Kashyap
10
16.39%
1
20.00%
Arun Kumar K
3
4.92%
1
20.00%
Krzysztof Kozlowski
1
1.64%
1
20.00%
Total
61
100.00%
5
100.00%

/*
 * Set wake up by local power mode and execute software reset for given core.
 *
 * Currently this is needed only when booting secondary CPU on Exynos3250.
 */


void exynos_core_restart(u32 core_id)
{
	u32 val;

	if (!of_machine_is_compatible("samsung,exynos3250"))
		return;

	while (!pmu_raw_readl(S5P_PMU_SPARE2))
		udelay(10);
	udelay(10);

	val = pmu_raw_readl(EXYNOS_ARM_CORE_STATUS(core_id));
	val |= S5P_CORE_WAKEUP_FROM_LOCAL_CFG;
	pmu_raw_writel(val, EXYNOS_ARM_CORE_STATUS(core_id));

	pmu_raw_writel(EXYNOS_CORE_PO_RESET(core_id), EXYNOS_SWRESET);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Krzysztof Kozlowski
54
75.00%
1
50.00%
Bartlomiej Zolnierkiewicz
18
25.00%
1
50.00%
Total
72
100.00%
2
100.00%

/*
 * Write pen_release in a way that is guaranteed to be visible to all
 * observers, irrespective of whether they're taking part in coherency
 * or not.  This is necessary for the hotplug code to work reliably.
 */


static void write_pen_release(int val)
{
	pen_release = val;
	smp_wmb();
	sync_cache_w(&pen_release);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Russell King
21
95.45%
1
50.00%
Nico Pitre
1
4.55%
1
50.00%
Total
22
100.00%
2
100.00%



static void __iomem *scu_base_addr(void)
{
	return (void __iomem *)(S5P_VA_SCU);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Changhwan Youn
20
100.00%
1
100.00%
Total
20
100.00%
1
100.00%

static DEFINE_SPINLOCK(boot_lock);



static void exynos_secondary_init(unsigned int cpu)
{
	/*
         * let the primary processor know we're out of the
         * pen, then head off into the C entry point
         */
	write_pen_release(-1);

	/*
         * Synchronise with the boot thread.
         */
	spin_lock(&boot_lock);
	spin_unlock(&boot_lock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Changhwan Youn
25
83.33%
1
33.33%
Russell King
3
10.00%
1
33.33%
Marc Zyngier
2
6.67%
1
33.33%
Total
30
100.00%
3
100.00%



int exynos_set_boot_addr(u32 core_id, unsigned long boot_addr)
{
	int ret;

	/*
         * Try to set boot address using firmware first
         * and fall back to boot register if it fails.
         */
	ret = call_firmware_op(set_cpu_boot_addr, core_id, boot_addr);
	if (ret && ret != -ENOSYS)
		goto fail;
	if (ret == -ENOSYS) {
		void __iomem *boot_reg = cpu_boot_reg(core_id);

		if (IS_ERR(boot_reg)) {
			ret = PTR_ERR(boot_reg);
			goto fail;
		}
		writel_relaxed(boot_addr, boot_reg);
		ret = 0;
	}
fail:
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Bartlomiej Zolnierkiewicz
92
98.92%
1
50.00%
Ben Dooks
1
1.08%
1
50.00%
Total
93
100.00%
2
100.00%



int exynos_get_boot_addr(u32 core_id, unsigned long *boot_addr)
{
	int ret;

	/*
         * Try to get boot address using firmware first
         * and fall back to boot register if it fails.
         */
	ret = call_firmware_op(get_cpu_boot_addr, core_id, boot_addr);
	if (ret && ret != -ENOSYS)
		goto fail;
	if (ret == -ENOSYS) {
		void __iomem *boot_reg = cpu_boot_reg(core_id);

		if (IS_ERR(boot_reg)) {
			ret = PTR_ERR(boot_reg);
			goto fail;
		}
		*boot_addr = readl_relaxed(boot_reg);
		ret = 0;
	}
fail:
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Bartlomiej Zolnierkiewicz
94
98.95%
1
50.00%
Ben Dooks
1
1.05%
1
50.00%
Total
95
100.00%
2
100.00%



static int exynos_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
	unsigned long timeout;
	u32 mpidr = cpu_logical_map(cpu);
	u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
	int ret = -ENOSYS;

	/*
         * Set synchronisation state between this boot processor
         * and the secondary one
         */
	spin_lock(&boot_lock);

	/*
         * The secondary processor is waiting to be released from
         * the holding pen - release it, then wait for it to flag
         * that it has been released by resetting pen_release.
         *
         * Note that "pen_release" is the hardware CPU core ID, whereas
         * "cpu" is Linux's internal ID.
         */
	write_pen_release(core_id);

	if (!exynos_cpu_power_state(core_id)) {
		exynos_cpu_power_up(core_id);
		timeout = 10;

		/* wait max 10 ms until cpu1 is on */
		while (exynos_cpu_power_state(core_id)
		       != S5P_CORE_LOCAL_PWR_EN) {
			if (timeout-- == 0)
				break;

			mdelay(1);
		}

		if (timeout == 0) {
			printk(KERN_ERR "cpu1 power enable failed");
			spin_unlock(&boot_lock);
			return -ETIMEDOUT;
		}
	}

	exynos_core_restart(core_id);

	/*
         * Send the secondary CPU a soft interrupt, thereby causing
         * the boot monitor to read the system wide flags register,
         * and branch to the address found there.
         */

	timeout = jiffies + (1 * HZ);
	while (time_before(jiffies, timeout)) {
		unsigned long boot_addr;

		smp_rmb();

		boot_addr = __pa_symbol(exynos4_secondary_startup);

		ret = exynos_set_boot_addr(core_id, boot_addr);
		if (ret)
			goto fail;

		call_firmware_op(cpu_boot, core_id);

		if (soc_is_exynos3250())
			dsb_sev();
		else
			arch_send_wakeup_ipi_mask(cpumask_of(cpu));

		if (pen_release == -1)
			break;

		udelay(10);
	}

	if (pen_release != -1)
		ret = -ETIMEDOUT;

	/*
         * now the secondary core is starting up let it run its
         * calibrations, then wait for it to finish
         */
fail:
	spin_unlock(&boot_lock);

	return pen_release != -1 ? ret : 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Changhwan Youn
83
33.33%
1
5.88%
JungHi Min
68
27.31%
1
5.88%
Tomasz Figa
42
16.87%
3
17.65%
Bartlomiej Zolnierkiewicz
22
8.84%
3
17.65%
Sachin Kamat
19
7.63%
1
5.88%
Krzysztof Kozlowski
5
2.01%
1
5.88%
Leela Krishna Amudala
3
1.20%
1
5.88%
Marc Zyngier
2
0.80%
1
5.88%
Russell King
2
0.80%
2
11.76%
Will Deacon
1
0.40%
1
5.88%
Rob Herring
1
0.40%
1
5.88%
Florian Fainelli
1
0.40%
1
5.88%
Total
249
100.00%
17
100.00%



static void __init exynos_smp_prepare_cpus(unsigned int max_cpus)
{
	int i;

	exynos_sysram_init();

	exynos_set_delayed_reset_assertion(true);

	if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9)
		scu_enable(scu_base_addr());

	/*
         * Write the address of secondary startup into the
         * system-wide flags register. The boot monitor waits
         * until it receives a soft interrupt, and then the
         * secondary CPU branches to this address.
         *
         * Try using firmware operation first and fall back to
         * boot register if it fails.
         */
	for (i = 1; i < max_cpus; ++i) {
		unsigned long boot_addr;
		u32 mpidr;
		u32 core_id;
		int ret;

		mpidr = cpu_logical_map(i);
		core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
		boot_addr = __pa_symbol(exynos4_secondary_startup);

		ret = exynos_set_boot_addr(core_id, boot_addr);
		if (ret)
			break;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tomasz Figa
53
52.48%
3
21.43%
Changhwan Youn
17
16.83%
1
7.14%
Sachin Kamat
11
10.89%
1
7.14%
Kukjin Kim
5
4.95%
2
14.29%
Krzysztof Kozlowski
5
4.95%
1
7.14%
Olof Johansson
3
2.97%
1
7.14%
Leela Krishna Amudala
2
1.98%
1
7.14%
Marc Zyngier
2
1.98%
1
7.14%
Bartlomiej Zolnierkiewicz
1
0.99%
1
7.14%
Russell King
1
0.99%
1
7.14%
Florian Fainelli
1
0.99%
1
7.14%
Total
101
100.00%
14
100.00%

#ifdef CONFIG_HOTPLUG_CPU
/*
 * platform-specific code to shutdown a CPU
 *
 * Called with IRQs disabled
 */


static void exynos_cpu_die(unsigned int cpu)
{
	int spurious = 0;
	u32 mpidr = cpu_logical_map(cpu);
	u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);

	v7_exit_coherency_flush(louis);

	platform_do_lowpower(cpu, &spurious);

	/*
         * bring this CPU back into the world of cache
         * coherency, and then restore interrupts
         */
	cpu_leave_lowpower(core_id);

	if (spurious)
		pr_warn("CPU%u: %u spurious wakeup calls\n", cpu, spurious);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Krzysztof Kozlowski
65
100.00%
2
100.00%
Total
65
100.00%
2
100.00%

#endif /* CONFIG_HOTPLUG_CPU */


const struct smp_operations exynos_smp_ops __initconst = {
	.smp_prepare_cpus	= exynos_smp_prepare_cpus,
	.smp_secondary_init	= exynos_secondary_init,
	.smp_boot_secondary	= exynos_boot_secondary,
#ifdef CONFIG_HOTPLUG_CPU
	.cpu_die		= exynos_cpu_die,
#endif
};
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Krzysztof Kozlowski
346
28.50%
7
15.91%
Bartlomiej Zolnierkiewicz
262
21.58%
5
11.36%
Changhwan Youn
180
14.83%
1
2.27%
Tomasz Figa
158
13.01%
3
6.82%
JungHi Min
68
5.60%
1
2.27%
Sachin Kamat
45
3.71%
1
2.27%
Marc Zyngier
38
3.13%
1
2.27%
Abhilash Kesavan
31
2.55%
1
2.27%
Russell King
30
2.47%
4
9.09%
Chander Kashyap
10
0.82%
1
2.27%
Pankaj Dubey
9
0.74%
3
6.82%
Kukjin Kim
7
0.58%
3
6.82%
Arnd Bergmann
6
0.49%
1
2.27%
Leela Krishna Amudala
5
0.41%
2
4.55%
Will Deacon
4
0.33%
2
4.55%
Olof Johansson
3
0.25%
1
2.27%
Arun Kumar K
3
0.25%
1
2.27%
Rob Herring
2
0.16%
2
4.55%
Masahiro Yamada
2
0.16%
1
2.27%
Florian Fainelli
2
0.16%
1
2.27%
Ben Dooks
2
0.16%
1
2.27%
Nico Pitre
1
0.08%
1
2.27%
Total
1214
100.00%
44
100.00%
Directory: arch/arm/mach-exynos

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.