arch/arm/plat-omap/include/plat/smp.h

   1 /*
   2  * OMAP4 machine specific smp.h
   3  *
   4  * Copyright (C) 2009 Texas Instruments, Inc.
   5  *
   6  * Author:
   7  *      Santosh Shilimkar <santosh.shilimkar@ti.com>
   8  *
   9  * Interface functions needed for the SMP. This file is based on arm
  10  * realview smp platform.
  11  * Copyright (c) 2003 ARM Limited.
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License version 2 as
  15  * published by the Free Software Foundation.
  16  */
  17 #ifndef OMAP_ARCH_SMP_H
  18 #define OMAP_ARCH_SMP_H
  19
  20 #include <asm/hardware/gic.h>
  21
  22 /*
  23  * set_event() is used to wake up secondary core from wfe using sev. ROM
  24  * code puts the second core into wfe(standby).
  25  *
  26  */
  27 #define set_event()     __asm__ __volatile__ ("sev" : : : "memory")
  28
  29 /* Needed for secondary core boot */
  30 extern void omap_secondary_startup(void);
  31
  32 /*
  33  * We use Soft IRQ1 as the IPI
  34  */
  35 static inline void smp_cross_call(const struct cpumask *mask)
  36 {
  37         gic_raise_softirq(mask, 1);
  38 }
  39
  40 /*
  41  * Read MPIDR: Multiprocessor affinity register
  42  */
  43 #define hard_smp_processor_id()                 \
  44         ({                                              \
  45                 unsigned int cpunum;                    \
  46                 __asm__("mrc p15, 0, %0, c0, c0, 5"     \
  47                         : "=r" (cpunum));               \
  48                 cpunum &= 0x0F;                         \
  49         })
  50
  51 #endif