1/*
2 * OMAP4 SMP cpu-hotplug support
3 *
4 * Copyright (C) 2010 Texas Instruments, Inc.
5 * Author:
6 *      Santosh Shilimkar <santosh.shilimkar@ti.com>
7 *
8 * Platform file needed for the OMAP4 SMP. This file is based on arm
9 * realview smp platform.
10 * Copyright (c) 2002 ARM Limited.
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 */
16
17#include <linux/kernel.h>
18#include <linux/errno.h>
19#include <linux/smp.h>
20#include <linux/io.h>
21
22#include "omap-wakeupgen.h"
23#include "common.h"
24#include "powerdomain.h"
25
26/*
27 * platform-specific code to shutdown a CPU
28 * Called with IRQs disabled
29 */
30void __ref omap4_cpu_die(unsigned int cpu)
31{
32	unsigned int boot_cpu = 0;
33	void __iomem *base = omap_get_wakeupgen_base();
34
35	/*
36	 * we're ready for shutdown now, so do it
37	 */
38	if (omap_secure_apis_support()) {
39		if (omap_modify_auxcoreboot0(0x0, 0x200) != 0x0)
40			pr_err("Secure clear status failed\n");
41	} else {
42		writel_relaxed(0, base + OMAP_AUX_CORE_BOOT_0);
43	}
44
45
46	for (;;) {
47		/*
48		 * Enter into low power state
49		 */
50		omap4_hotplug_cpu(cpu, PWRDM_POWER_OFF);
51
52		if (omap_secure_apis_support())
53			boot_cpu = omap_read_auxcoreboot0();
54		else
55			boot_cpu =
56				readl_relaxed(base + OMAP_AUX_CORE_BOOT_0) >> 5;
57
58		if (boot_cpu == smp_processor_id()) {
59			/*
60			 * OK, proper wakeup, we're done
61			 */
62			break;
63		}
64		pr_debug("CPU%u: spurious wakeup call\n", cpu);
65	}
66}
67