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69 lines
1.4 KiB
69 lines
1.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* OMAP4 SMP cpu-hotplug support |
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* |
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* Copyright (C) 2010 Texas Instruments, Inc. |
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* Author: |
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* Santosh Shilimkar <[email protected]> |
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* |
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* Platform file needed for the OMAP4 SMP. This file is based on arm |
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* realview smp platform. |
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* Copyright (c) 2002 ARM Limited. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/errno.h> |
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#include <linux/smp.h> |
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#include <linux/io.h> |
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#include "omap-wakeupgen.h" |
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#include "common.h" |
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#include "powerdomain.h" |
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/* |
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* platform-specific code to shutdown a CPU |
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* Called with IRQs disabled |
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*/ |
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void omap4_cpu_die(unsigned int cpu) |
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{ |
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unsigned int boot_cpu = 0; |
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void __iomem *base = omap_get_wakeupgen_base(); |
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/* |
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* we're ready for shutdown now, so do it |
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*/ |
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if (omap_secure_apis_support()) { |
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if (omap_modify_auxcoreboot0(0x0, 0x200) != 0x0) |
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pr_err("Secure clear status failed\n"); |
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} else { |
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writel_relaxed(0, base + OMAP_AUX_CORE_BOOT_0); |
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} |
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for (;;) { |
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/* |
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* Enter into low power state |
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*/ |
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omap4_hotplug_cpu(cpu, PWRDM_POWER_OFF); |
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if (omap_secure_apis_support()) |
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boot_cpu = omap_read_auxcoreboot0() >> 9; |
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else |
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boot_cpu = |
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readl_relaxed(base + OMAP_AUX_CORE_BOOT_0) >> 5; |
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if (boot_cpu == smp_processor_id()) { |
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/* |
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* OK, proper wakeup, we're done |
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*/ |
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break; |
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} |
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pr_debug("CPU%u: spurious wakeup call\n", cpu); |
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} |
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} |
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/* Needed by kexec and platform_can_cpu_hotplug() */ |
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int omap4_cpu_kill(unsigned int cpu) |
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{ |
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return 1; |
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}
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