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/* SPDX-License-Identifier: GPL-2.0 */
/* timer.h: System timer definitions for sun5.
*
* Copyright (C) 1997, 2008 David S. Miller (davem@davemloft.net)
*/
#ifndef _SPARC64_TIMER_H
#define _SPARC64_TIMER_H
#include <uapi/asm/asi.h>
#include <linux/types.h>
#include <linux/init.h>
/* The most frequently accessed fields should be first,
* to fit into the same cacheline.
*/
struct sparc64_tick_ops {
unsigned long ticks_per_nsec_quotient;
unsigned long offset;
unsigned long long (*get_tick)(void);
int (*add_compare)(unsigned long);
unsigned long softint_mask;
void (*disable_irq)(void);
void (*init_tick)(void);
unsigned long (*add_tick)(unsigned long);
unsigned long (*get_frequency)(void);
unsigned long frequency;
char *name;
};
extern struct sparc64_tick_ops *tick_ops;
unsigned long sparc64_get_clock_tick(unsigned int cpu);
void setup_sparc64_timer(void);
#define TICK_PRIV_BIT BIT(63)
#define TICKCMP_IRQ_BIT BIT(63)
#define HBIRD_STICKCMP_ADDR 0x1fe0000f060UL
#define HBIRD_STICK_ADDR 0x1fe0000f070UL
#define GET_TICK_NINSTR 13
struct get_tick_patch {
unsigned int addr;
unsigned int tick[GET_TICK_NINSTR];
unsigned int stick[GET_TICK_NINSTR];
};
extern struct get_tick_patch __get_tick_patch;
extern struct get_tick_patch __get_tick_patch_end;
static inline unsigned long get_tick(void)
{
unsigned long tick, tmp1, tmp2;
__asm__ __volatile__(
/* read hbtick 13 instructions */
"661:\n"
" mov 0x1fe, %1\n"
" sllx %1, 0x20, %1\n"
" sethi %%hi(0xf000), %2\n"
" or %2, 0x70, %2\n"
" or %1, %2, %1\n" /* %1 = HBIRD_STICK_ADDR */
" add %1, 8, %2\n"
" ldxa [%2]%3, %0\n"
" ldxa [%1]%3, %1\n"
" ldxa [%2]%3, %2\n"
" sub %2, %0, %0\n" /* don't modify %xcc */
" brnz,pn %0, 661b\n" /* restart to save one register */
" sllx %2, 32, %2\n"
" or %2, %1, %0\n"
/* Common/not patched code */
" sllx %0, 1, %0\n"
" srlx %0, 1, %0\n" /* Clear TICK_PRIV_BIT */
/* Beginning of patch section */
" .section .get_tick_patch, \"ax\"\n"
" .word 661b\n"
/* read tick 2 instructions and 11 skipped */
" ba 1f\n"
" rd %%tick, %0\n"
" .skip 4 * (%4 - 2)\n"
"1:\n"
/* read stick 2 instructions and 11 skipped */
" ba 1f\n"
" rd %%asr24, %0\n"
" .skip 4 * (%4 - 2)\n"
"1:\n"
/* End of patch section */
" .previous\n"
: "=&r" (tick), "=&r" (tmp1), "=&r" (tmp2)
: "i" (ASI_PHYS_BYPASS_EC_E), "i" (GET_TICK_NINSTR));
return tick;
}
#endif /* _SPARC64_TIMER_H */