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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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ae2163be10
Commit beb2dc0a7a breaks the MPC8xx which
seems to not support using mfspr SPRN_TBRx instead of mftb/mftbu
despite what is written in the reference manual.
This patch reverts to the use of mftb/mftbu when CONFIG_8xx is
selected.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <scottwood@freescale.com>
59 lines
962 B
C
59 lines
962 B
C
#ifndef _ASM_POWERPC_TIMEX_H
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#define _ASM_POWERPC_TIMEX_H
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#ifdef __KERNEL__
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/*
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* PowerPC architecture timex specifications
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*/
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#include <asm/cputable.h>
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#include <asm/reg.h>
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#define CLOCK_TICK_RATE 1024000 /* Underlying HZ */
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typedef unsigned long cycles_t;
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static inline cycles_t get_cycles(void)
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{
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#ifdef __powerpc64__
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return mftb();
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#else
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cycles_t ret;
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/*
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* For the "cycle" counter we use the timebase lower half.
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* Currently only used on SMP.
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*/
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ret = 0;
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__asm__ __volatile__(
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#ifdef CONFIG_8xx
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"97: mftb %0\n"
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#else
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"97: mfspr %0, %2\n"
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#endif
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"99:\n"
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".section __ftr_fixup,\"a\"\n"
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".align 2\n"
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"98:\n"
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" .long %1\n"
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" .long 0\n"
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" .long 97b-98b\n"
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" .long 99b-98b\n"
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" .long 0\n"
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" .long 0\n"
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".previous"
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#ifdef CONFIG_8xx
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: "=r" (ret) : "i" (CPU_FTR_601));
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#else
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: "=r" (ret) : "i" (CPU_FTR_601), "i" (SPRN_TBRL));
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#endif
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return ret;
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#endif
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}
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_TIMEX_H */
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