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Subject[PATCH v8 16/19] cpuidle: tegra: Squash Tegra114 driver into the common driver
Date
Tegra20/30/114/124 SoCs have common idling states, thus there is no much
point in having separate drivers for a similar hardware. This patch moves
Tegra114/124 arch/ drivers into the common driver without any functional
changes. The CC6 state is kept disabled on Tegra114/124 because the core
Tegra PM code needs some more work in order to support that state.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
arch/arm/mach-tegra/Makefile | 7 --
arch/arm/mach-tegra/cpuidle-tegra114.c | 90 --------------------------
arch/arm/mach-tegra/cpuidle.c | 37 -----------
arch/arm/mach-tegra/cpuidle.h | 16 -----
arch/arm/mach-tegra/tegra.c | 6 +-
drivers/cpuidle/cpuidle-tegra.c | 44 ++++++++++++-
6 files changed, 47 insertions(+), 153 deletions(-)
delete mode 100644 arch/arm/mach-tegra/cpuidle-tegra114.c
delete mode 100644 arch/arm/mach-tegra/cpuidle.c
delete mode 100644 arch/arm/mach-tegra/cpuidle.h

diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile
index 99c5f4274e5c..07572b5373b8 100644
--- a/arch/arm/mach-tegra/Makefile
+++ b/arch/arm/mach-tegra/Makefile
@@ -10,19 +10,12 @@ obj-y += sleep.o
obj-y += tegra.o
obj-y += sleep-tegra20.o
obj-y += sleep-tegra30.o
-obj-$(CONFIG_CPU_IDLE) += cpuidle.o
obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += pm-tegra20.o
obj-$(CONFIG_ARCH_TEGRA_3x_SOC) += pm-tegra30.o
obj-$(CONFIG_SMP) += platsmp.o
obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o

obj-$(CONFIG_ARCH_TEGRA_114_SOC) += pm-tegra30.o
-ifeq ($(CONFIG_CPU_IDLE),y)
-obj-$(CONFIG_ARCH_TEGRA_114_SOC) += cpuidle-tegra114.o
-endif
obj-$(CONFIG_ARCH_TEGRA_124_SOC) += pm-tegra30.o
-ifeq ($(CONFIG_CPU_IDLE),y)
-obj-$(CONFIG_ARCH_TEGRA_124_SOC) += cpuidle-tegra114.o
-endif

obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += board-paz00.o
diff --git a/arch/arm/mach-tegra/cpuidle-tegra114.c b/arch/arm/mach-tegra/cpuidle-tegra114.c
deleted file mode 100644
index 858c30cc5dc7..000000000000
--- a/arch/arm/mach-tegra/cpuidle-tegra114.c
+++ /dev/null
@@ -1,90 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (c) 2013, NVIDIA Corporation. All rights reserved.
- */
-
-#include <asm/firmware.h>
-#include <linux/tick.h>
-#include <linux/cpuidle.h>
-#include <linux/cpu_pm.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-
-#include <linux/firmware/trusted_foundations.h>
-
-#include <soc/tegra/pm.h>
-
-#include <asm/cpuidle.h>
-#include <asm/smp_plat.h>
-#include <asm/suspend.h>
-#include <asm/psci.h>
-
-#include "cpuidle.h"
-#include "sleep.h"
-
-#ifdef CONFIG_PM_SLEEP
-#define TEGRA114_MAX_STATES 2
-#else
-#define TEGRA114_MAX_STATES 1
-#endif
-
-#ifdef CONFIG_PM_SLEEP
-static int tegra114_idle_power_down(struct cpuidle_device *dev,
- struct cpuidle_driver *drv,
- int index)
-{
- local_fiq_disable();
-
- tegra_pm_set_cpu_in_lp2();
- cpu_pm_enter();
-
- call_firmware_op(prepare_idle, TF_PM_MODE_LP2_NOFLUSH_L2);
-
- /* Do suspend by ourselves if the firmware does not implement it */
- if (call_firmware_op(do_idle, 0) == -ENOSYS)
- cpu_suspend(0, tegra30_pm_secondary_cpu_suspend);
-
- cpu_pm_exit();
- tegra_pm_clear_cpu_in_lp2();
-
- local_fiq_enable();
-
- return index;
-}
-
-static void tegra114_idle_enter_s2idle(struct cpuidle_device *dev,
- struct cpuidle_driver *drv,
- int index)
-{
- tegra114_idle_power_down(dev, drv, index);
-}
-#endif
-
-static struct cpuidle_driver tegra_idle_driver = {
- .name = "tegra_idle",
- .owner = THIS_MODULE,
- .state_count = TEGRA114_MAX_STATES,
- .states = {
- [0] = ARM_CPUIDLE_WFI_STATE_PWR(600),
-#ifdef CONFIG_PM_SLEEP
- [1] = {
- .enter = tegra114_idle_power_down,
- .enter_s2idle = tegra114_idle_enter_s2idle,
- .exit_latency = 500,
- .target_residency = 1000,
- .flags = CPUIDLE_FLAG_TIMER_STOP,
- .power_usage = 0,
- .name = "powered-down",
- .desc = "CPU power gated",
- },
-#endif
- },
-};
-
-int __init tegra114_cpuidle_init(void)
-{
- if (!psci_smp_available())
- return cpuidle_register(&tegra_idle_driver, NULL);
-
- return 0;
-}
diff --git a/arch/arm/mach-tegra/cpuidle.c b/arch/arm/mach-tegra/cpuidle.c
deleted file mode 100644
index fa0dcf3c2c45..000000000000
--- a/arch/arm/mach-tegra/cpuidle.c
+++ /dev/null
@@ -1,37 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * arch/arm/mach-tegra/cpuidle.c
- *
- * CPU idle driver for Tegra CPUs
- *
- * Copyright (c) 2010-2012, NVIDIA Corporation.
- * Copyright (c) 2011 Google, Inc.
- * Author: Colin Cross <ccross@android.com>
- * Gary King <gking@nvidia.com>
- *
- * Rework for 3.3 by Peter De Schrijver <pdeschrijver@nvidia.com>
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-
-#include <soc/tegra/fuse.h>
-
-#include "cpuidle.h"
-
-void __init tegra_cpuidle_init(void)
-{
- switch (tegra_get_chip_id()) {
- case TEGRA20:
- case TEGRA30:
- platform_device_register_simple("tegra-cpuidle", -1, NULL, 0);
- break;
- case TEGRA114:
- case TEGRA124:
- if (IS_ENABLED(CONFIG_ARCH_TEGRA_114_SOC) ||
- IS_ENABLED(CONFIG_ARCH_TEGRA_124_SOC))
- tegra114_cpuidle_init();
- break;
- }
-}
diff --git a/arch/arm/mach-tegra/cpuidle.h b/arch/arm/mach-tegra/cpuidle.h
deleted file mode 100644
index 5423a05a69f6..000000000000
--- a/arch/arm/mach-tegra/cpuidle.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright (c) 2012, NVIDIA Corporation. All rights reserved.
- */
-
-#ifndef __MACH_TEGRA_CPUIDLE_H
-#define __MACH_TEGRA_CPUIDLE_H
-
-#ifdef CONFIG_CPU_IDLE
-int tegra114_cpuidle_init(void);
-void tegra_cpuidle_init(void);
-#else
-static inline void tegra_cpuidle_init(void) {}
-#endif
-
-#endif
diff --git a/arch/arm/mach-tegra/tegra.c b/arch/arm/mach-tegra/tegra.c
index 79184a077c84..eeacff626546 100644
--- a/arch/arm/mach-tegra/tegra.c
+++ b/arch/arm/mach-tegra/tegra.c
@@ -36,11 +36,11 @@
#include <asm/mach/arch.h>
#include <asm/mach/time.h>
#include <asm/mach-types.h>
+#include <asm/psci.h>
#include <asm/setup.h>

#include "board.h"
#include "common.h"
-#include "cpuidle.h"
#include "iomap.h"
#include "pm.h"
#include "reset.h"
@@ -85,7 +85,6 @@ static void __init tegra_dt_init(void)
static void __init tegra_dt_init_late(void)
{
tegra_init_suspend();
- tegra_cpuidle_init();

if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC) &&
of_machine_is_compatible("compal,paz00"))
@@ -98,6 +97,9 @@ static void __init tegra_dt_init_late(void)
if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC) &&
of_machine_is_compatible("nvidia,tegra30"))
platform_device_register_simple("tegra20-cpufreq", -1, NULL, 0);
+
+ if (IS_ENABLED(CONFIG_ARM_TEGRA_CPUIDLE) && !psci_smp_available())
+ platform_device_register_simple("tegra-cpuidle", -1, NULL, 0);
}

static const char * const tegra_dt_board_compat[] = {
diff --git a/drivers/cpuidle/cpuidle-tegra.c b/drivers/cpuidle/cpuidle-tegra.c
index bacc1d1532cd..bbd7999a3910 100644
--- a/drivers/cpuidle/cpuidle-tegra.c
+++ b/drivers/cpuidle/cpuidle-tegra.c
@@ -24,6 +24,7 @@
#include <linux/types.h>

#include <linux/clk/tegra.h>
+#include <linux/firmware/trusted_foundations.h>

#include <soc/tegra/cpuidle.h>
#include <soc/tegra/flowctrl.h>
@@ -32,6 +33,7 @@
#include <soc/tegra/pm.h>

#include <asm/cpuidle.h>
+#include <asm/firmware.h>
#include <asm/smp_plat.h>
#include <asm/suspend.h>

@@ -45,6 +47,11 @@ enum {
static atomic_t tegra_idle_barrier;
static atomic_t tegra_abort_flag;

+static inline bool tegra_cpuidle_using_firmware(void)
+{
+ return firmware_ops->prepare_idle && firmware_ops->do_idle;
+}
+
static void tegra_cpuidle_report_cpus_state(void)
{
unsigned int cpu, lcpu;
@@ -121,6 +128,16 @@ static int tegra_cpuidle_cc6_enter(unsigned int cpu)

static int tegra_cpuidle_c7_enter(void)
{
+ int err;
+
+ if (tegra_cpuidle_using_firmware()) {
+ err = call_firmware_op(prepare_idle, TF_PM_MODE_LP2_NOFLUSH_L2);
+ if (err)
+ return err;
+
+ return call_firmware_op(do_idle, 0);
+ }
+
return cpu_suspend(0, tegra30_pm_secondary_cpu_suspend);
}

@@ -229,6 +246,13 @@ static int tegra_cpuidle_enter(struct cpuidle_device *dev,
return err ? -1 : index;
}

+static void tegra114_enter_s2idle(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv,
+ int index)
+{
+ tegra_cpuidle_enter(dev, drv, index);
+}
+
/*
* The previous versions of Tegra CPUIDLE driver used a different "legacy"
* terminology for naming of the idling states, while this driver uses the
@@ -290,6 +314,15 @@ void tegra_cpuidle_pcie_irqs_in_use(void)
tegra_idle_driver.states[TEGRA_CC6].disabled = true;
}

+static void tegra_cpuidle_setup_tegra114_c7_state(void)
+{
+ struct cpuidle_state *s = &tegra_idle_driver.states[TEGRA_C7];
+
+ s->enter_s2idle = tegra114_enter_s2idle;
+ s->target_residency = 1000;
+ s->exit_latency = 500;
+}
+
static int tegra_cpuidle_probe(struct platform_device *pdev)
{
/*
@@ -298,7 +331,9 @@ static int tegra_cpuidle_probe(struct platform_device *pdev)
* is disabled.
*/
if (!IS_ENABLED(CONFIG_PM_SLEEP)) {
- tegra_idle_driver.states[TEGRA_C7].disabled = true;
+ if (!tegra_cpuidle_using_firmware())
+ tegra_idle_driver.states[TEGRA_C7].disabled = true;
+
tegra_idle_driver.states[TEGRA_CC6].disabled = true;
}

@@ -313,6 +348,13 @@ static int tegra_cpuidle_probe(struct platform_device *pdev)
break;
case TEGRA30:
break;
+ case TEGRA114:
+ case TEGRA124:
+ tegra_cpuidle_setup_tegra114_c7_state();
+
+ /* coupled CC6 (LP2) state isn't implemented yet */
+ tegra_idle_driver.states[TEGRA_CC6].disabled = true;
+ break;
default:
return -EINVAL;
}
--
2.24.0
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