Merge "ARM: qcom: Add MSM Legacy hotplug low power mode APIs"
diff --git a/arch/arm/mach-qcom/Makefile b/arch/arm/mach-qcom/Makefile
index 5b93fa3..2f26f39 100644
--- a/arch/arm/mach-qcom/Makefile
+++ b/arch/arm/mach-qcom/Makefile
@@ -1,5 +1,6 @@
obj-$(CONFIG_USE_OF) += board-dt.o
obj-$(CONFIG_SMP) += platsmp.o
+obj-$(CONFIG_MSM_PM_LEGACY) +=hotplug.o
obj-$(CONFIG_ARCH_SDXPOORWILLS) += board-poorwills.o
obj-$(CONFIG_ARCH_MSM8953) += board-msm8953.o
obj-$(CONFIG_ARCH_MSM8937) += board-msm8937.o
diff --git a/arch/arm/mach-qcom/hotplug.c b/arch/arm/mach-qcom/hotplug.c
new file mode 100644
index 0000000..c038f4b
--- /dev/null
+++ b/arch/arm/mach-qcom/hotplug.c
@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2002 ARM Ltd.
+ * All Rights Reserved
+ * Copyright (c) 2011-2014, 2016, 2018, The Linux Foundation.
+ * 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/kernel.h>
+#include <linux/errno.h>
+#include <linux/smp.h>
+#include <linux/cpu.h>
+#include <soc/qcom/spm.h>
+#include <soc/qcom/pm-legacy.h>
+#include <asm/smp_plat.h>
+#include "platsmp.h"
+#include <soc/qcom/jtag.h>
+
+static cpumask_t cpu_dying_mask;
+static DEFINE_PER_CPU(unsigned int, warm_boot_flag);
+
+static inline void cpu_enter_lowpower(void)
+{
+}
+
+static inline void cpu_leave_lowpower(void)
+{
+}
+
+static inline void platform_do_lowpower(unsigned int cpu)
+{
+ lpm_cpu_hotplug_enter(cpu);
+ /*
+ * getting here, means that we have come out of low power mode
+ * without having been woken up - this shouldn't happen
+ *
+ */
+ pr_err("%s: CPU%u has failed to Hotplug\n", __func__, cpu);
+}
+
+int qcom_cpu_kill_legacy(unsigned int cpu)
+{
+ int ret = 0;
+
+ if (cpumask_test_and_clear_cpu(cpu, &cpu_dying_mask))
+ ret = msm_pm_wait_cpu_shutdown(cpu);
+
+ return ret ? 0 : 1;
+}
+
+/*
+ * platform-specific code to shutdown a CPU
+ *
+ * Called with IRQs disabled
+ */
+void __ref qcom_cpu_die_legacy(unsigned int cpu)
+{
+ if (unlikely(cpu != smp_processor_id())) {
+ pr_crit("%s: running on %u, should be %u\n",
+ __func__, smp_processor_id(), cpu);
+ WARN_ON(cpu);
+ }
+ /*
+ * we're ready for shutdown now, so do it
+ */
+ cpu_enter_lowpower();
+ platform_do_lowpower(cpu);
+
+ pr_debug("CPU%u: %s: normal wakeup\n", cpu, __func__);
+ cpu_leave_lowpower();
+}
+
+int msm_platform_secondary_init(unsigned int cpu)
+{
+ int ret;
+ unsigned int *warm_boot = this_cpu_ptr(&warm_boot_flag);
+
+ if (!(*warm_boot)) {
+ *warm_boot = 1;
+ /*
+ * All CPU0 boots are considered warm boots (restore needed)
+ * since CPU0 is the system boot CPU and never cold-booted
+ * by the kernel.
+ */
+ if (cpu)
+ return 0;
+ }
+ msm_jtag_restore_state();
+ ret = msm_spm_set_low_power_mode(MSM_SPM_MODE_CLOCK_GATING, false);
+
+ return ret;
+}
+
+static int hotplug_dying_cpu(unsigned int cpu)
+{
+ cpumask_set_cpu(cpu, &cpu_dying_mask);
+ return 0;
+}
+
+static int __init init_hotplug_dying(void)
+{
+ cpuhp_setup_state(CPUHP_AP_QCOM_SLEEP_STARTING,
+ "AP_QCOM_HOTPLUG_STARTING", NULL, hotplug_dying_cpu);
+
+ return 0;
+}
+early_initcall(init_hotplug_dying);
diff --git a/arch/arm/mach-qcom/platsmp.c b/arch/arm/mach-qcom/platsmp.c
index c422ac3..803804d 100644
--- a/arch/arm/mach-qcom/platsmp.c
+++ b/arch/arm/mach-qcom/platsmp.c
@@ -22,6 +22,9 @@
#include <asm/smp_plat.h>
#include <asm/fixmap.h>
#include "platsmp.h"
+#ifdef CONFIG_MSM_PM_LEGACY
+#include <soc/qcom/pm-legacy.h>
+#endif
#define MSM_APCS_IDR 0x0B011030
@@ -62,10 +65,18 @@
{
wfi();
}
+
+static bool qcom_cpu_can_disable(unsigned int cpu)
+{
+ return true; /*Hotplug of any CPU is supported */
+}
#endif
static void qcom_secondary_init(unsigned int cpu)
{
+#ifdef CONFIG_MSM_PM_LEGACY
+ WARN_ON(msm_platform_secondary_init(cpu));
+#endif
/*
* Synchronise with the boot thread.
*/
@@ -472,8 +483,14 @@
.smp_secondary_init = qcom_secondary_init,
.smp_boot_secondary = msm8909_boot_secondary,
#ifdef CONFIG_HOTPLUG_CPU
+#ifdef CONFIG_MSM_PM_LEGACY
+ .cpu_die = qcom_cpu_die_legacy,
+ .cpu_kill = qcom_cpu_kill_legacy,
+#else
.cpu_die = qcom_cpu_die,
#endif
+ .cpu_can_disable = qcom_cpu_can_disable,
+#endif
};
CPU_METHOD_OF_DECLARE(qcom_smp_8909, "qcom,apss-8909", &msm8909_smp_ops);
diff --git a/include/soc/qcom/pm-legacy.h b/include/soc/qcom/pm-legacy.h
index 7fdb0cd..0ae5d7b 100644
--- a/include/soc/qcom/pm-legacy.h
+++ b/include/soc/qcom/pm-legacy.h
@@ -179,9 +179,13 @@
#endif
#ifdef CONFIG_HOTPLUG_CPU
+void qcom_cpu_die_legacy(unsigned int cpu);
+int qcom_cpu_kill_legacy(unsigned int cpu);
int msm_platform_secondary_init(unsigned int cpu);
#else
static inline int msm_platform_secondary_init(unsigned int cpu) { return 0; }
+static inline void qcom_cpu_die_legacy(unsigned int cpu) {}
+static inline int qcom_cpu_kill_legacy(unsigned int cpu) { return 0; }
#endif
enum msm_pm_time_stats_id {