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Santosh Shilimkar7d35b8d2010-08-02 13:18:19 +03001/*
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>
Santosh Shilimkar247c4452012-05-09 20:38:35 +053020#include <linux/io.h>
Santosh Shilimkar7d35b8d2010-08-02 13:18:19 +030021
Tony Lindgren732231a2012-09-20 11:41:16 -070022#include "omap-wakeupgen.h"
Tony Lindgren4e653312011-11-10 22:45:17 +010023#include "common.h"
Santosh Shilimkarb5b4f282010-06-16 22:19:48 +053024#include "powerdomain.h"
25
Santosh Shilimkar7d35b8d2010-08-02 13:18:19 +030026/*
27 * platform-specific code to shutdown a CPU
28 * Called with IRQs disabled
29 */
Marc Zyngier06915322011-09-08 13:15:22 +010030void __ref omap4_cpu_die(unsigned int cpu)
Santosh Shilimkar7d35b8d2010-08-02 13:18:19 +030031{
Santosh Shilimkar247c4452012-05-09 20:38:35 +053032 unsigned int boot_cpu = 0;
33 void __iomem *base = omap_get_wakeupgen_base();
Santosh Shilimkarb5b4f282010-06-16 22:19:48 +053034
Santosh Shilimkar7d35b8d2010-08-02 13:18:19 +030035 /*
36 * we're ready for shutdown now, so do it
37 */
Santosh Shilimkar247c4452012-05-09 20:38:35 +053038 if (omap_secure_apis_support()) {
39 if (omap_modify_auxcoreboot0(0x0, 0x200) != 0x0)
40 pr_err("Secure clear status failed\n");
41 } else {
42 __raw_writel(0, base + OMAP_AUX_CORE_BOOT_0);
43 }
44
Santosh Shilimkar7d35b8d2010-08-02 13:18:19 +030045
46 for (;;) {
47 /*
Santosh Shilimkarb5b4f282010-06-16 22:19:48 +053048 * Enter into low power state
Santosh Shilimkar7d35b8d2010-08-02 13:18:19 +030049 */
Santosh Shilimkarb5b4f282010-06-16 22:19:48 +053050 omap4_hotplug_cpu(cpu, PWRDM_POWER_OFF);
Santosh Shilimkar247c4452012-05-09 20:38:35 +053051
52 if (omap_secure_apis_support())
53 boot_cpu = omap_read_auxcoreboot0();
54 else
55 boot_cpu =
56 __raw_readl(base + OMAP_AUX_CORE_BOOT_0) >> 5;
57
58 if (boot_cpu == smp_processor_id()) {
Santosh Shilimkar7d35b8d2010-08-02 13:18:19 +030059 /*
60 * OK, proper wakeup, we're done
61 */
62 break;
63 }
64 pr_debug("CPU%u: spurious wakeup call\n", cpu);
65 }
66}