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Linux/arch/arm/mach-spear/hotplug.c

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  1 /*
  2  * linux/arch/arm/mach-spear13xx/hotplug.c
  3  *
  4  * Copyright (C) 2012 ST Microelectronics Ltd.
  5  * Deepak Sikri <deepak.sikri@st.com>
  6  *
  7  * based upon linux/arch/arm/mach-realview/hotplug.c
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License version 2 as
 11  * published by the Free Software Foundation.
 12  */
 13 #include <linux/kernel.h>
 14 #include <linux/errno.h>
 15 #include <linux/smp.h>
 16 #include <asm/cp15.h>
 17 #include <asm/smp_plat.h>
 18 
 19 static inline void cpu_enter_lowpower(void)
 20 {
 21         unsigned int v;
 22 
 23         asm volatile(
 24         "       mcr     p15, 0, %1, c7, c5, 0\n"
 25         "       dsb\n"
 26         /*
 27          * Turn off coherency
 28          */
 29         "       mrc     p15, 0, %0, c1, c0, 1\n"
 30         "       bic     %0, %0, #0x20\n"
 31         "       mcr     p15, 0, %0, c1, c0, 1\n"
 32         "       mrc     p15, 0, %0, c1, c0, 0\n"
 33         "       bic     %0, %0, %2\n"
 34         "       mcr     p15, 0, %0, c1, c0, 0\n"
 35         : "=&r" (v)
 36         : "r" (0), "Ir" (CR_C)
 37         : "cc", "memory");
 38 }
 39 
 40 static inline void cpu_leave_lowpower(void)
 41 {
 42         unsigned int v;
 43 
 44         asm volatile("mrc       p15, 0, %0, c1, c0, 0\n"
 45         "       orr     %0, %0, %1\n"
 46         "       mcr     p15, 0, %0, c1, c0, 0\n"
 47         "       mrc     p15, 0, %0, c1, c0, 1\n"
 48         "       orr     %0, %0, #0x20\n"
 49         "       mcr     p15, 0, %0, c1, c0, 1\n"
 50         : "=&r" (v)
 51         : "Ir" (CR_C)
 52         : "cc");
 53 }
 54 
 55 static inline void spear13xx_do_lowpower(unsigned int cpu, int *spurious)
 56 {
 57         for (;;) {
 58                 wfi();
 59 
 60                 if (pen_release == cpu) {
 61                         /*
 62                          * OK, proper wakeup, we're done
 63                          */
 64                         break;
 65                 }
 66 
 67                 /*
 68                  * Getting here, means that we have come out of WFI without
 69                  * having been woken up - this shouldn't happen
 70                  *
 71                  * Just note it happening - when we're woken, we can report
 72                  * its occurrence.
 73                  */
 74                 (*spurious)++;
 75         }
 76 }
 77 
 78 /*
 79  * platform-specific code to shutdown a CPU
 80  *
 81  * Called with IRQs disabled
 82  */
 83 void spear13xx_cpu_die(unsigned int cpu)
 84 {
 85         int spurious = 0;
 86 
 87         /*
 88          * we're ready for shutdown now, so do it
 89          */
 90         cpu_enter_lowpower();
 91         spear13xx_do_lowpower(cpu, &spurious);
 92 
 93         /*
 94          * bring this CPU back into the world of cache
 95          * coherency, and then restore interrupts
 96          */
 97         cpu_leave_lowpower();
 98 
 99         if (spurious)
100                 pr_warn("CPU%u: %u spurious wakeup calls\n", cpu, spurious);
101 }
102 

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