Commit 6d45a402 authored by Anson Huang's avatar Anson Huang Committed by Shawn Guo
Browse files

ARM: imx: add i.MX7ULP cpuidle support 



This patch adds cpuidle support for i.MX7ULP, 3 cpuidle
states supported as below:

1. WFI, just ARM wfi;
2. WAIT mode, mapped to SoC's partial stop mode #3;
3. STOP mode, mapped to SoC's partial stop mode #1.

In WAIT mode, system clock and bus clock will be enabled;
In STOP mode, system clock and bus clock will be disabled.

Signed-off-by: default avatarAnson Huang <Anson.Huang@nxp.com>
Signed-off-by: default avatarShawn Guo <shawnguo@kernel.org>
parent 23b2441b

arch/arm/mach-imx/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ obj-$(CONFIG_SOC_IMX6SL) += cpuidle-imx6sl.o 
obj-$(CONFIG_SOC_IMX6SLL) += cpuidle-imx6sx.o

obj-$(CONFIG_SOC_IMX6SX) += cpuidle-imx6sx.o

obj-$(CONFIG_SOC_IMX6UL) += cpuidle-imx6sx.o

obj-$(CONFIG_SOC_IMX7ULP) += cpuidle-imx7ulp.o

endif



ifdef CONFIG_SND_SOC_IMX_PCM_FIQ

arch/arm/mach-imx/common.h

+10 −0
Original line number Diff line number Diff line
@@ -72,6 +72,15 @@ enum mxc_cpu_pwr_mode { 
	STOP_POWER_OFF,		/* STOP + SRPG */

};



enum ulp_cpu_pwr_mode {

	ULP_PM_HSRUN,    /* High speed run mode */

	ULP_PM_RUN,      /* Run mode */

	ULP_PM_WAIT,     /* Wait mode */

	ULP_PM_STOP,     /* Stop mode */

	ULP_PM_VLPS,     /* Very low power stop mode */

	ULP_PM_VLLS,     /* very low leakage stop mode */

};



void imx_enable_cpu(int cpu, bool enable);

void imx_set_cpu_jump(int cpu, void *jump_addr);

u32 imx_get_cpu_arg(int cpu);
@@ -98,6 +107,7 @@ int imx6_set_lpm(enum mxc_cpu_pwr_mode mode); 
void imx6_set_int_mem_clk_lpm(bool enable);

void imx6sl_set_wait_clk(bool enter);

int imx_mmdc_get_ddr_type(void);

int imx7ulp_set_lpm(enum ulp_cpu_pwr_mode mode);



void imx_cpu_die(unsigned int cpu);

int imx_cpu_kill(unsigned int cpu);

arch/arm/mach-imx/cpuidle-imx7ulp.c

0 → 100644
+60 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0+

/*

 * Copyright (C) 2016 Freescale Semiconductor, Inc.

 * Copyright 2017-2018 NXP

 *   Anson Huang <Anson.Huang@nxp.com>

 */



#include <linux/cpuidle.h>

#include <linux/module.h>

#include <asm/cpuidle.h>



#include "common.h"

#include "cpuidle.h"



static int imx7ulp_enter_wait(struct cpuidle_device *dev,

			    struct cpuidle_driver *drv, int index)

{

	if (index == 1)

		imx7ulp_set_lpm(ULP_PM_WAIT);

	else

		imx7ulp_set_lpm(ULP_PM_STOP);



	cpu_do_idle();



	imx7ulp_set_lpm(ULP_PM_RUN);



	return index;

}



static struct cpuidle_driver imx7ulp_cpuidle_driver = {

	.name = "imx7ulp_cpuidle",

	.owner = THIS_MODULE,

	.states = {

		/* WFI */

		ARM_CPUIDLE_WFI_STATE,

		/* WAIT */

		{

			.exit_latency = 50,

			.target_residency = 75,

			.enter = imx7ulp_enter_wait,

			.name = "WAIT",

			.desc = "PSTOP2",

		},

		/* STOP */

		{

			.exit_latency = 100,

			.target_residency = 150,

			.enter = imx7ulp_enter_wait,

			.name = "STOP",

			.desc = "PSTOP1",

		},

	},

	.state_count = 3,

	.safe_state_index = 0,

};



int __init imx7ulp_cpuidle_init(void)

{

	return cpuidle_register(&imx7ulp_cpuidle_driver, NULL);

}

arch/arm/mach-imx/cpuidle.h

+5 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ extern int imx5_cpuidle_init(void); 
extern int imx6q_cpuidle_init(void);

extern int imx6sl_cpuidle_init(void);

extern int imx6sx_cpuidle_init(void);

extern int imx7ulp_cpuidle_init(void);

#else

static inline int imx5_cpuidle_init(void)

{
@@ -32,4 +33,8 @@ static inline int imx6sx_cpuidle_init(void) 
{

	return 0;

}

static inline int imx7ulp_cpuidle_init(void)

{

	return 0;

}

#endif

arch/arm/mach-imx/mach-imx7ulp.c

+7 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
#include <asm/mach/arch.h>



#include "common.h"

#include "cpuidle.h"

#include "hardware.h"



static void __init imx7ulp_init_machine(void)
@@ -25,7 +26,13 @@ static const char *const imx7ulp_dt_compat[] __initconst = { 
	NULL,

};



static void __init imx7ulp_init_late(void)

{

	imx7ulp_cpuidle_init();

}



DT_MACHINE_START(IMX7ulp, "Freescale i.MX7ULP (Device Tree)")

	.init_machine	= imx7ulp_init_machine,

	.dt_compat	= imx7ulp_dt_compat,

	.init_late	= imx7ulp_init_late,

MACHINE_END

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