/* 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);
|
void __init time_init(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 */
|
