LXR linux/arch/sparc/include/asm/timer

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/* timer.h: System timer definitions for sun5.
   3 *
   4 * Copyright (C) 1997, 2008 David S. Miller (davem@davemloft.net)
   5 */
   6
   7#ifndef _SPARC64_TIMER_H
   8#define _SPARC64_TIMER_H
   9
  10#include <linux/types.h>
  11#include <linux/init.h>
  12
  13/* The most frequently accessed fields should be first,
  14 * to fit into the same cacheline.
  15 */
  16struct sparc64_tick_ops {
  17        unsigned long ticks_per_nsec_quotient;
  18        unsigned long offset;
  19        unsigned long long (*get_tick)(void);
  20        int (*add_compare)(unsigned long);
  21        unsigned long softint_mask;
  22        void (*disable_irq)(void);
  23
  24        void (*init_tick)(void);
  25        unsigned long (*add_tick)(unsigned long);
  26        unsigned long (*get_frequency)(void);
  27        unsigned long frequency;
  28
  29        char *name;
  30};
  31
  32extern struct sparc64_tick_ops *tick_ops;
  33
  34unsigned long sparc64_get_clock_tick(unsigned int cpu);
  35void setup_sparc64_timer(void);
  36void __init time_init(void);
  37
  38#define TICK_PRIV_BIT           BIT(63)
  39#define TICKCMP_IRQ_BIT         BIT(63)
  40
  41#define HBIRD_STICKCMP_ADDR     0x1fe0000f060UL
  42#define HBIRD_STICK_ADDR        0x1fe0000f070UL
  43
  44#define GET_TICK_NINSTR         13
  45struct get_tick_patch {
  46        unsigned int    addr;
  47        unsigned int    tick[GET_TICK_NINSTR];
  48        unsigned int    stick[GET_TICK_NINSTR];
  49};
  50
  51extern struct get_tick_patch __get_tick_patch;
  52extern struct get_tick_patch __get_tick_patch_end;
  53
  54static inline unsigned long get_tick(void)
  55{
  56        unsigned long tick, tmp1, tmp2;
  57
  58        __asm__ __volatile__(
  59        /* read hbtick 13 instructions */
  60        "661:\n"
  61        "       mov     0x1fe, %1\n"
  62        "       sllx    %1, 0x20, %1\n"
  63        "       sethi   %%hi(0xf000), %2\n"
  64        "       or      %2, 0x70, %2\n"
  65        "       or      %1, %2, %1\n"   /* %1 = HBIRD_STICK_ADDR */
  66        "       add     %1, 8, %2\n"
  67        "       ldxa    [%2]%3, %0\n"
  68        "       ldxa    [%1]%3, %1\n"
  69        "       ldxa    [%2]%3, %2\n"
  70        "       sub     %2, %0, %0\n"   /* don't modify %xcc */
  71        "       brnz,pn %0, 661b\n"     /* restart to save one register */
  72        "        sllx   %2, 32, %2\n"
  73        "       or      %2, %1, %0\n"
  74        /* Common/not patched code */
  75        "       sllx    %0, 1, %0\n"
  76        "       srlx    %0, 1, %0\n"    /* Clear TICK_PRIV_BIT */
  77        /* Beginning of patch section */
  78        "       .section .get_tick_patch, \"ax\"\n"
  79        "       .word   661b\n"
  80        /* read tick 2 instructions and 11 skipped */
  81        "       ba      1f\n"
  82        "        rd     %%tick, %0\n"
  83        "       .skip   4 * (%4 - 2)\n"
  84        "1:\n"
  85        /* read stick 2 instructions and 11 skipped */
  86        "       ba      1f\n"
  87        "        rd     %%asr24, %0\n"
  88        "       .skip   4 * (%4 - 2)\n"
  89        "1:\n"
  90        /* End of patch section */
  91        "       .previous\n"
  92        : "=&r" (tick), "=&r" (tmp1), "=&r" (tmp2)
  93        : "i" (ASI_PHYS_BYPASS_EC_E), "i" (GET_TICK_NINSTR));
  94
  95        return tick;
  96}
  97
  98#endif /* _SPARC64_TIMER_H */
  99