From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001 From: root Date: Fri, 25 Dec 2015 04:40:36 +0000 Subject: initial_commit --- arch/arm/mach-omap2/omap-hotplug.c | 67 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 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..4976b939 --- /dev/null +++ b/arch/arm/mach-omap2/omap-hotplug.c @@ -0,0 +1,67 @@ +/* + * 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 + +int platform_cpu_kill(unsigned int cpu) +{ + return 1; +} + +/* + * platform-specific code to shutdown a CPU + * Called with IRQs disabled + */ +void platform_cpu_die(unsigned int cpu) +{ + flush_cache_all(); + dsb(); + + /* + * we're ready for shutdown now, so do it + */ + if (omap_modify_auxcoreboot0(0x0, 0x200) != 0x0) + printk(KERN_CRIT "Secure clear status failed\n"); + + for (;;) { + /* + * Execute WFI + */ + do_wfi(); + + if (omap_read_auxcoreboot0() == cpu) { + /* + * OK, proper wakeup, we're done + */ + break; + } + pr_debug("CPU%u: spurious wakeup call\n", cpu); + } +} + +int platform_cpu_disable(unsigned int cpu) +{ + /* + * we don't allow CPU 0 to be shutdown (it is still too special + * e.g. clock tick interrupts) + */ + return cpu == 0 ? -EPERM : 0; +} -- cgit v1.2.3