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		__raw_writel(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				__raw_readl(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}

 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * OMAP4 SMP cpu-hotplug support
 4 *
 5 * Copyright (C) 2010 Texas Instruments, Inc.
 6 * Author:
 7 *      Santosh Shilimkar <santosh.shilimkar@ti.com>
 8 *
 9 * Platform file needed for the OMAP4 SMP. This file is based on arm
10 * realview smp platform.
11 * Copyright (c) 2002 ARM Limited.
 
 
 
 
12 */
13
14#include <linux/kernel.h>
15#include <linux/errno.h>
16#include <linux/smp.h>
17#include <linux/io.h>
18
19#include "omap-wakeupgen.h"
20#include "common.h"
21#include "powerdomain.h"
22
23/*
24 * platform-specific code to shutdown a CPU
25 * Called with IRQs disabled
26 */
27void omap4_cpu_die(unsigned int cpu)
28{
29	unsigned int boot_cpu = 0;
30	void __iomem *base = omap_get_wakeupgen_base();
31
32	/*
33	 * we're ready for shutdown now, so do it
34	 */
35	if (omap_secure_apis_support()) {
36		if (omap_modify_auxcoreboot0(0x0, 0x200) != 0x0)
37			pr_err("Secure clear status failed\n");
38	} else {
39		writel_relaxed(0, base + OMAP_AUX_CORE_BOOT_0);
40	}
41
42
43	for (;;) {
44		/*
45		 * Enter into low power state
46		 */
47		omap4_hotplug_cpu(cpu, PWRDM_POWER_OFF);
48
49		if (omap_secure_apis_support())
50			boot_cpu = omap_read_auxcoreboot0() >> 9;
51		else
52			boot_cpu =
53				readl_relaxed(base + OMAP_AUX_CORE_BOOT_0) >> 5;
54
55		if (boot_cpu == smp_processor_id()) {
56			/*
57			 * OK, proper wakeup, we're done
58			 */
59			break;
60		}
61		pr_debug("CPU%u: spurious wakeup call\n", cpu);
62	}
63}
64
65/* Needed by kexec and platform_can_cpu_hotplug() */
66int omap4_cpu_kill(unsigned int cpu)
67{
68	return 1;
69}