projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 7d35b8d0 SS |
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> | |
| 247c445c | 20 | #include <linux/io.h> |
| 7d35b8d0 SS |
21 | |
| 22 | #include <asm/cacheflush.h> | |
| 732231a7 | 23 | #include "omap-wakeupgen.h" |
| 4e65331c TL |
24 | |
| 25 | #include "common.h" | |
| 7d35b8d0 | 26 | |
| b5b4f288 SS |
27 | #include "powerdomain.h" |
| 28 | ||
| 7d35b8d0 SS |
29 | /* |
| 30 | * platform-specific code to shutdown a CPU | |
| 31 | * Called with IRQs disabled | |
| 32 | */ | |
| 06915321 | 33 | void __ref omap4_cpu_die(unsigned int cpu) |
| 7d35b8d0 | 34 | { |
| 247c445c SS |
35 | unsigned int boot_cpu = 0; |
| 36 | void __iomem *base = omap_get_wakeupgen_base(); | |
| b5b4f288 | 37 | |
| 7d35b8d0 SS |
38 | flush_cache_all(); |
| 39 | dsb(); | |
| 40 | ||
| 41 | /* | |
| 42 | * we're ready for shutdown now, so do it | |
| 43 | */ | |
| 247c445c SS |
44 | if (omap_secure_apis_support()) { |
| 45 | if (omap_modify_auxcoreboot0(0x0, 0x200) != 0x0) | |
| 46 | pr_err("Secure clear status failed\n"); | |
| 47 | } else { | |
| 48 | __raw_writel(0, base + OMAP_AUX_CORE_BOOT_0); | |
| 49 | } | |
| 50 | ||
| 7d35b8d0 SS |
51 | |
| 52 | for (;;) { | |
| 53 | /* | |
| b5b4f288 | 54 | * Enter into low power state |
| 7d35b8d0 | 55 | */ |
| b5b4f288 | 56 | omap4_hotplug_cpu(cpu, PWRDM_POWER_OFF); |
| 247c445c SS |
57 | |
| 58 | if (omap_secure_apis_support()) | |
| 59 | boot_cpu = omap_read_auxcoreboot0(); | |
| 60 | else | |
| 61 | boot_cpu = | |
| 62 | __raw_readl(base + OMAP_AUX_CORE_BOOT_0) >> 5; | |
| 63 | ||
| 64 | if (boot_cpu == smp_processor_id()) { | |
| 7d35b8d0 SS |
65 | /* |
| 66 | * OK, proper wakeup, we're done | |
| 67 | */ | |
| 68 | break; | |
| 69 | } | |
| 70 | pr_debug("CPU%u: spurious wakeup call\n", cpu); | |
| 71 | } | |
| 72 | } |