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Diffstat (limited to 'arch/metag/tbx/tbitimer.S')
| -rw-r--r-- | arch/metag/tbx/tbitimer.S | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/arch/metag/tbx/tbitimer.S b/arch/metag/tbx/tbitimer.S new file mode 100644 index 00000000000..5dbeddeee7b --- /dev/null +++ b/arch/metag/tbx/tbitimer.S @@ -0,0 +1,207 @@ +/* + * tbitimer.S + * + * Copyright (C) 2001, 2002, 2007, 2012 Imagination Technologies. + * + * This program is free software; you can redistribute it and/or modify it under + * the terms of the GNU General Public License version 2 as published by the + * Free Software Foundation. + * + * TBI timer support routines and data values + */ + + .file "tbitimer.S" +/* + * Get data structures and defines from the main C header + */ +#include <asm/tbx.h> + + .data + .balign 8 + .global ___TBITimeB + .type ___TBITimeB,object +___TBITimeB: + .quad 0 /* Background 'lost' ticks */ + .size ___TBITimeB,.-___TBITimeB + + .data + .balign 8 + .global ___TBITimeI + .type ___TBITimeI,object +___TBITimeI: + .quad 0 /* Interrupt 'lost' ticks */ + .size ___TBITimeI,.-___TBITimeI + + .data + .balign 8 + .global ___TBITimes + .type ___TBITimes,object +___TBITimes: + .long ___TBITimeB /* Table of 'lost' tick values */ + .long ___TBITimeI + .size ___TBITimes,.-___TBITimes + +/* + * Flag bits for control of ___TBITimeCore + */ +#define TIMER_SET_BIT 1 +#define TIMER_ADD_BIT 2 + +/* + * Initialise or stop timer support + * + * Register Usage: D1Ar1 holds Id, D1Ar2 is initial delay or 0 + * D0FrT is used to call ___TBITimeCore + * D0Re0 is used for the result which is TXSTAT_TIMER_BIT + * D0Ar4, D1Ar5, D0Ar6 are all used as scratch + * Other registers are those set by ___TBITimeCore + * A0.3 is assumed to point at ___TBITime(I/B) + */ + .text + .balign 4 + .global ___TBITimerCtrl + .type ___TBITimerCtrl,function +___TBITimerCtrl: + MOV D1Ar5,#TIMER_SET_BIT /* Timer SET request */ + MOVT D0FrT,#HI(___TBITimeCore) /* Get timer core reg values */ + CALL D0FrT,#LO(___TBITimeCore) /* and perform register update */ + NEGS D0Ar6,D0Ar2 /* Set flags from time-stamp */ + ASR D1Ar5,D0Ar6,#31 /* Sign extend D0Ar6 into D1Ar5 */ + SETLNZ [A0.3],D0Ar6,D1Ar5 /* ___TBITime(B/I)=-Start if enable */ + MOV PC,D1RtP /* Return */ + .size ___TBITimerCtrl,.-___TBITimerCtrl + +/* + * Return ___TBITimeStamp value + * + * Register Usage: D1Ar1 holds Id + * D0FrT is used to call ___TBITimeCore + * D0Re0, D1Re0 is used for the result + * D1Ar3, D0Ar4, D1Ar5 + * Other registers are those set by ___TBITimeCore + * D0Ar6 is assumed to be the timer value read + * A0.3 is assumed to point at ___TBITime(I/B) + */ + .text + .balign 4 + .global ___TBITimeStamp + .type ___TBITimeStamp,function +___TBITimeStamp: + MOV D1Ar5,#0 /* Timer GET request */ + MOVT D0FrT,#HI(___TBITimeCore) /* Get timer core reg values */ + CALL D0FrT,#LO(___TBITimeCore) /* with no register update */ + ADDS D0Re0,D0Ar4,D0Ar6 /* Add current time value */ + ADD D1Re0,D1Ar3,D1Ar5 /* to 64-bit signed extend time */ + ADDCS D1Re0,D1Re0,#1 /* Support borrow too */ + MOV PC,D1RtP /* Return */ + .size ___TBITimeStamp,.-___TBITimeStamp + +/* + * Perform ___TBITimerAdd logic + * + * Register Usage: D1Ar1 holds Id, D0Ar2 holds value to be added to the timer + * D0Re0 is used for the result - new TIMER value + * D1Ar5, D0Ar6 are used as scratch + * Other registers are those set by ___TBITimeCore + * D0Ar6 is assumed to be the timer value read + * D0Ar4, D1Ar3 is the current value of ___TBITime(B/I) + */ + .text + .balign 4 + .global ___TBITimerAdd + .type ___TBITimerAdd,function +___TBITimerAdd: + MOV D1Ar5,#TIMER_ADD_BIT /* Timer ADD request */ + MOVT D0FrT,#HI(___TBITimeCore) /* Get timer core reg values */ + CALL D0FrT,#LO(___TBITimeCore) /* with no register update */ + ADD D0Re0,D0Ar2,D0Ar6 /* Regenerate new value = result */ + NEG D0Ar2,D0Ar2 /* Negate delta */ + ASR D1Re0,D0Ar2,#31 /* Sign extend negated delta */ + ADDS D0Ar4,D0Ar4,D0Ar2 /* Add time added to ... */ + ADD D1Ar3,D1Ar3,D1Re0 /* ... real timer ... */ + ADDCS D1Ar3,D1Ar3,#1 /* ... with carry */ + SETL [A0.3],D0Ar4,D1Ar3 /* Update ___TBITime(B/I) */ + MOV PC,D1RtP /* Return */ + .size ___TBITimerAdd,.-___TBITimerAdd + +#ifdef TBI_1_4 +/* + * Perform ___TBITimerDeadline logic + * NB: Delays are positive compared to the Wait values which are -ive + * + * Register Usage: D1Ar1 holds Id + * D0Ar2 holds Delay requested + * D0Re0 is used for the result - old TIMER Delay value + * D1Ar5, D0Ar6 are used as scratch + * Other registers are those set by ___TBITimeCore + * D0Ar6 is assumed to be the timer value read + * D0Ar4, D1Ar3 is the current value of ___TBITime(B/I) + * + */ + .text + .type ___TBITimerDeadline,function + .global ___TBITimerDeadline + .align 2 +___TBITimerDeadline: + MOV D1Ar5,#TIMER_SET_BIT /* Timer SET request */ + MOVT D0FrT,#HI(___TBITimeCore) /* Get timer core reg values */ + CALL D0FrT,#LO(___TBITimeCore) /* with no register update */ + MOV D0Re0,D0Ar6 /* Old value read = result */ + SUB D0Ar2,D0Ar6,D0Ar2 /* Delta from (old - new) */ + ASR D1Re0,D0Ar2,#31 /* Sign extend delta */ + ADDS D0Ar4,D0Ar4,D0Ar2 /* Add time added to ... */ + ADD D1Ar3,D1Ar3,D1Re0 /* ... real timer ... */ + ADDCS D1Ar3,D1Ar3,#1 /* ... with carry */ + SETL [A0.3],D0Ar4,D1Ar3 /* Update ___TBITime(B/I) */ + MOV PC,D1RtP /* Return */ + .size ___TBITimerDeadline,.-___TBITimerDeadline +#endif /* TBI_1_4 */ + +/* + * Perform core timer access logic + * + * Register Usage: D1Ar1 holds Id, D0Ar2 holds input value for SET and + * input value for ADD + * D1Ar5 controls op as SET or ADD as bit values + * On return D0Ar6, D1Ar5 holds the old 64-bit timer value + * A0.3 is setup to point at ___TBITime(I/B) + * A1.3 is setup to point at ___TBITimes + * D0Ar4, D1Ar3 is setup to value of ___TBITime(I/B) + */ + .text + .balign 4 + .global ___TBITimeCore + .type ___TBITimeCore,function +___TBITimeCore: +#ifndef METAC_0_1 + TSTT D1Ar1,#HI(TBID_ISTAT_BIT) /* Interrupt level timer? */ +#endif + MOVT A1LbP,#HI(___TBITimes) + ADD A1LbP,A1LbP,#LO(___TBITimes) + MOV A1.3,A1LbP /* Get ___TBITimes address */ +#ifndef METAC_0_1 + BNZ $LTimeCoreI /* Yes: Service TXTIMERI! */ +#endif + LSRS D1Ar5,D1Ar5,#1 /* Carry = SET, Zero = !ADD */ + GETD A0.3,[A1.3+#0] /* A0.3 == &___TBITimeB */ + MOV D0Ar6,TXTIMER /* Always GET old value */ + MOVCS TXTIMER,D0Ar2 /* Conditional SET operation */ + ADDNZ TXTIMER,D0Ar2,D0Ar6 /* Conditional ADD operation */ +#ifndef METAC_0_1 + B $LTimeCoreEnd +$LTimeCoreI: + LSRS D1Ar5,D1Ar5,#1 /* Carry = SET, Zero = !ADD */ + GETD A0.3,[A1.3+#4] /* A0.3 == &___TBITimeI */ + MOV D0Ar6,TXTIMERI /* Always GET old value */ + MOVCS TXTIMERI,D0Ar2 /* Conditional SET operation */ + ADDNZ TXTIMERI,D0Ar2,D0Ar6 /* Conditional ADD operation */ +$LTimeCoreEnd: +#endif + ASR D1Ar5,D0Ar6,#31 /* Sign extend D0Ar6 into D1Ar5 */ + GETL D0Ar4,D1Ar3,[A0.3] /* Read ___TBITime(B/I) */ + MOV PC,D0FrT /* Return quickly */ + .size ___TBITimeCore,.-___TBITimeCore + +/* + * End of tbitimer.S + */ |