include/asm/timer_64.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /* timer.h: System timer definitions for sun5.
0003  *
0004  * Copyright (C) 1997, 2008 David S. Miller (davem@davemloft.net)
0005  */
0006
0007 #ifndef _SPARC64_TIMER_H
0008 #define _SPARC64_TIMER_H
0009
0010 #include <uapi/asm/asi.h>
0011 #include <linux/types.h>
0012 #include <linux/init.h>
0013
0014 /* The most frequently accessed fields should be first,
0015  * to fit into the same cacheline.
0016  */
0017 struct sparc64_tick_ops {
0018     unsigned long ticks_per_nsec_quotient;
0019     unsigned long offset;
0020     unsigned long long (*get_tick)(void);
0021     int (*add_compare)(unsigned long);
0022     unsigned long softint_mask;
0023     void (*disable_irq)(void);
0024
0025     void (*init_tick)(void);
0026     unsigned long (*add_tick)(unsigned long);
0027     unsigned long (*get_frequency)(void);
0028     unsigned long frequency;
0029
0030     char *name;
0031 };
0032
0033 extern struct sparc64_tick_ops *tick_ops;
0034
0035 unsigned long sparc64_get_clock_tick(unsigned int cpu);
0036 void setup_sparc64_timer(void);
0037 void __init time_init(void);
0038
0039 #define TICK_PRIV_BIT       BIT(63)
0040 #define TICKCMP_IRQ_BIT     BIT(63)
0041
0042 #define HBIRD_STICKCMP_ADDR 0x1fe0000f060UL
0043 #define HBIRD_STICK_ADDR    0x1fe0000f070UL
0044
0045 #define GET_TICK_NINSTR     13
0046 struct get_tick_patch {
0047     unsigned int    addr;
0048     unsigned int    tick[GET_TICK_NINSTR];
0049     unsigned int    stick[GET_TICK_NINSTR];
0050 };
0051
0052 extern struct get_tick_patch __get_tick_patch;
0053 extern struct get_tick_patch __get_tick_patch_end;
0054
0055 static inline unsigned long get_tick(void)
0056 {
0057     unsigned long tick, tmp1, tmp2;
0058
0059     __asm__ __volatile__(
0060     /* read hbtick 13 instructions */
0061     "661:\n"
0062     "   mov 0x1fe, %1\n"
0063     "   sllx    %1, 0x20, %1\n"
0064     "   sethi   %%hi(0xf000), %2\n"
0065     "   or  %2, 0x70, %2\n"
0066     "   or  %1, %2, %1\n"   /* %1 = HBIRD_STICK_ADDR */
0067     "   add %1, 8, %2\n"
0068     "   ldxa    [%2]%3, %0\n"
0069     "   ldxa    [%1]%3, %1\n"
0070     "   ldxa    [%2]%3, %2\n"
0071     "   sub %2, %0, %0\n"   /* don't modify %xcc */
0072     "   brnz,pn %0, 661b\n" /* restart to save one register */
0073     "    sllx   %2, 32, %2\n"
0074     "   or  %2, %1, %0\n"
0075     /* Common/not patched code */
0076     "   sllx    %0, 1, %0\n"
0077     "   srlx    %0, 1, %0\n"    /* Clear TICK_PRIV_BIT */
0078     /* Beginning of patch section */
0079     "   .section .get_tick_patch, \"ax\"\n"
0080     "   .word   661b\n"
0081     /* read tick 2 instructions and 11 skipped */
0082     "   ba  1f\n"
0083     "    rd %%tick, %0\n"
0084     "   .skip   4 * (%4 - 2)\n"
0085     "1:\n"
0086     /* read stick 2 instructions and 11 skipped */
0087     "   ba  1f\n"
0088     "    rd %%asr24, %0\n"
0089     "   .skip   4 * (%4 - 2)\n"
0090     "1:\n"
0091     /* End of patch section */
0092     "   .previous\n"
0093     : "=&r" (tick), "=&r" (tmp1), "=&r" (tmp2)
0094     : "i" (ASI_PHYS_BYPASS_EC_E), "i" (GET_TICK_NINSTR));
0095
0096     return tick;
0097 }
0098
0099 #endif /* _SPARC64_TIMER_H */