17d35b8d0SSantosh Shilimkar /* 27d35b8d0SSantosh Shilimkar * OMAP4 SMP cpu-hotplug support 37d35b8d0SSantosh Shilimkar * 47d35b8d0SSantosh Shilimkar * Copyright (C) 2010 Texas Instruments, Inc. 57d35b8d0SSantosh Shilimkar * Author: 67d35b8d0SSantosh Shilimkar * Santosh Shilimkar <santosh.shilimkar@ti.com> 77d35b8d0SSantosh Shilimkar * 87d35b8d0SSantosh Shilimkar * Platform file needed for the OMAP4 SMP. This file is based on arm 97d35b8d0SSantosh Shilimkar * realview smp platform. 107d35b8d0SSantosh Shilimkar * Copyright (c) 2002 ARM Limited. 117d35b8d0SSantosh Shilimkar * 127d35b8d0SSantosh Shilimkar * This program is free software; you can redistribute it and/or modify 137d35b8d0SSantosh Shilimkar * it under the terms of the GNU General Public License version 2 as 147d35b8d0SSantosh Shilimkar * published by the Free Software Foundation. 157d35b8d0SSantosh Shilimkar */ 167d35b8d0SSantosh Shilimkar 177d35b8d0SSantosh Shilimkar #include <linux/kernel.h> 187d35b8d0SSantosh Shilimkar #include <linux/errno.h> 197d35b8d0SSantosh Shilimkar #include <linux/smp.h> 20247c445cSSantosh Shilimkar #include <linux/io.h> 217d35b8d0SSantosh Shilimkar 22732231a7STony Lindgren #include "omap-wakeupgen.h" 234e65331cSTony Lindgren #include "common.h" 24b5b4f288SSantosh Shilimkar #include "powerdomain.h" 25b5b4f288SSantosh Shilimkar 267d35b8d0SSantosh Shilimkar /* 277d35b8d0SSantosh Shilimkar * platform-specific code to shutdown a CPU 287d35b8d0SSantosh Shilimkar * Called with IRQs disabled 297d35b8d0SSantosh Shilimkar */ 30*b96fc2f3SStephen Boyd void omap4_cpu_die(unsigned int cpu) 317d35b8d0SSantosh Shilimkar { 32247c445cSSantosh Shilimkar unsigned int boot_cpu = 0; 33247c445cSSantosh Shilimkar void __iomem *base = omap_get_wakeupgen_base(); 34b5b4f288SSantosh Shilimkar 357d35b8d0SSantosh Shilimkar /* 367d35b8d0SSantosh Shilimkar * we're ready for shutdown now, so do it 377d35b8d0SSantosh Shilimkar */ 38247c445cSSantosh Shilimkar if (omap_secure_apis_support()) { 397d35b8d0SSantosh Shilimkar if (omap_modify_auxcoreboot0(0x0, 0x200) != 0x0) 40b5b4f288SSantosh Shilimkar pr_err("Secure clear status failed\n"); 41247c445cSSantosh Shilimkar } else { 42edfaf05cSVictor Kamensky writel_relaxed(0, base + OMAP_AUX_CORE_BOOT_0); 43247c445cSSantosh Shilimkar } 44247c445cSSantosh Shilimkar 457d35b8d0SSantosh Shilimkar 467d35b8d0SSantosh Shilimkar for (;;) { 477d35b8d0SSantosh Shilimkar /* 48b5b4f288SSantosh Shilimkar * Enter into low power state 497d35b8d0SSantosh Shilimkar */ 50b5b4f288SSantosh Shilimkar omap4_hotplug_cpu(cpu, PWRDM_POWER_OFF); 51247c445cSSantosh Shilimkar 52247c445cSSantosh Shilimkar if (omap_secure_apis_support()) 53247c445cSSantosh Shilimkar boot_cpu = omap_read_auxcoreboot0(); 54247c445cSSantosh Shilimkar else 55247c445cSSantosh Shilimkar boot_cpu = 56edfaf05cSVictor Kamensky readl_relaxed(base + OMAP_AUX_CORE_BOOT_0) >> 5; 57247c445cSSantosh Shilimkar 58247c445cSSantosh Shilimkar if (boot_cpu == smp_processor_id()) { 597d35b8d0SSantosh Shilimkar /* 607d35b8d0SSantosh Shilimkar * OK, proper wakeup, we're done 617d35b8d0SSantosh Shilimkar */ 627d35b8d0SSantosh Shilimkar break; 637d35b8d0SSantosh Shilimkar } 647d35b8d0SSantosh Shilimkar pr_debug("CPU%u: spurious wakeup call\n", cpu); 657d35b8d0SSantosh Shilimkar } 667d35b8d0SSantosh Shilimkar } 67