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> 207d35b8d0SSantosh Shilimkar 217d35b8d0SSantosh Shilimkar #include <asm/cacheflush.h> 22*4e65331cSTony Lindgren 23*4e65331cSTony Lindgren #include "common.h" 247d35b8d0SSantosh Shilimkar 257d35b8d0SSantosh Shilimkar int platform_cpu_kill(unsigned int cpu) 267d35b8d0SSantosh Shilimkar { 273c030beaSRussell King return 1; 287d35b8d0SSantosh Shilimkar } 297d35b8d0SSantosh Shilimkar 307d35b8d0SSantosh Shilimkar /* 317d35b8d0SSantosh Shilimkar * platform-specific code to shutdown a CPU 327d35b8d0SSantosh Shilimkar * Called with IRQs disabled 337d35b8d0SSantosh Shilimkar */ 347d35b8d0SSantosh Shilimkar void platform_cpu_die(unsigned int cpu) 357d35b8d0SSantosh Shilimkar { 367d35b8d0SSantosh Shilimkar flush_cache_all(); 377d35b8d0SSantosh Shilimkar dsb(); 387d35b8d0SSantosh Shilimkar 397d35b8d0SSantosh Shilimkar /* 407d35b8d0SSantosh Shilimkar * we're ready for shutdown now, so do it 417d35b8d0SSantosh Shilimkar */ 427d35b8d0SSantosh Shilimkar if (omap_modify_auxcoreboot0(0x0, 0x200) != 0x0) 437d35b8d0SSantosh Shilimkar printk(KERN_CRIT "Secure clear status failed\n"); 447d35b8d0SSantosh Shilimkar 457d35b8d0SSantosh Shilimkar for (;;) { 467d35b8d0SSantosh Shilimkar /* 477d35b8d0SSantosh Shilimkar * Execute WFI 487d35b8d0SSantosh Shilimkar */ 497d35b8d0SSantosh Shilimkar do_wfi(); 507d35b8d0SSantosh Shilimkar 517d35b8d0SSantosh Shilimkar if (omap_read_auxcoreboot0() == cpu) { 527d35b8d0SSantosh Shilimkar /* 537d35b8d0SSantosh Shilimkar * OK, proper wakeup, we're done 547d35b8d0SSantosh Shilimkar */ 557d35b8d0SSantosh Shilimkar break; 567d35b8d0SSantosh Shilimkar } 577d35b8d0SSantosh Shilimkar pr_debug("CPU%u: spurious wakeup call\n", cpu); 587d35b8d0SSantosh Shilimkar } 597d35b8d0SSantosh Shilimkar } 607d35b8d0SSantosh Shilimkar 617d35b8d0SSantosh Shilimkar int platform_cpu_disable(unsigned int cpu) 627d35b8d0SSantosh Shilimkar { 637d35b8d0SSantosh Shilimkar /* 647d35b8d0SSantosh Shilimkar * we don't allow CPU 0 to be shutdown (it is still too special 657d35b8d0SSantosh Shilimkar * e.g. clock tick interrupts) 667d35b8d0SSantosh Shilimkar */ 677d35b8d0SSantosh Shilimkar return cpu == 0 ? -EPERM : 0; 687d35b8d0SSantosh Shilimkar } 69