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