From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001 From: Yuval Adam <_@yuv.al> Date: Wed, 30 Aug 2017 08:25:59 +0000 Subject: Initial file dump from open source release --- arch/arm/mach-omap2/omap-hotplug.c | 66 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 arch/arm/mach-omap2/omap-hotplug.c (limited to 'arch/arm/mach-omap2/omap-hotplug.c') diff --git a/arch/arm/mach-omap2/omap-hotplug.c b/arch/arm/mach-omap2/omap-hotplug.c new file mode 100644 index 00000000..458f72f9 --- /dev/null +++ b/arch/arm/mach-omap2/omap-hotplug.c @@ -0,0 +1,66 @@ +/* + * OMAP4 SMP cpu-hotplug support + * + * Copyright (C) 2010 Texas Instruments, Inc. + * Author: + * Santosh Shilimkar + * + * Platform file needed for the OMAP4 SMP. This file is based on arm + * realview smp platform. + * Copyright (c) 2002 ARM Limited. + * + * 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 +#include +#include +#include + +#include "omap-wakeupgen.h" +#include "common.h" +#include "powerdomain.h" + +/* + * platform-specific code to shutdown a CPU + * Called with IRQs disabled + */ +void __ref omap4_cpu_die(unsigned int cpu) +{ + unsigned int boot_cpu = 0; + void __iomem *base = omap_get_wakeupgen_base(); + + /* + * we're ready for shutdown now, so do it + */ + if (omap_secure_apis_support()) { + if (omap_modify_auxcoreboot0(0x0, 0x200) != 0x0) + pr_err("Secure clear status failed\n"); + } else { + __raw_writel(0, base + OMAP_AUX_CORE_BOOT_0); + } + + + for (;;) { + /* + * Enter into low power state + */ + omap4_hotplug_cpu(cpu, PWRDM_POWER_OFF); + + if (omap_secure_apis_support()) + boot_cpu = omap_read_auxcoreboot0(); + else + boot_cpu = + __raw_readl(base + OMAP_AUX_CORE_BOOT_0) >> 5; + + if (boot_cpu == smp_processor_id()) { + /* + * OK, proper wakeup, we're done + */ + break; + } + pr_debug("CPU%u: spurious wakeup call\n", cpu); + } +} -- cgit v1.3.1