102 lines
2.1 KiB
C
Executable File
102 lines
2.1 KiB
C
Executable File
#include "pxa255_RTC.h"
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#include "mem.h"
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void pxa255rtcPrvUpdate(Pxa255rtc* rtc){
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UInt32 time = rtcCurTime();
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if(rtc->lastSeenTime != time){ //do not triger alarm more than once per second please
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if((rtc->RTSR & 0x4) && (time + rtc->RCNR_offset == rtc->RTAR)){ //check alarm
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rtc->RTSR |= 1;
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}
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if(rtc->RTSR & 0x8){ //send HZ interrupt
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rtc->RTSR |= 2;
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}
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}
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pxa255icInt(rtc->ic, PXA255_I_RTC_ALM, (rtc->RTSR & 1) != 0);
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pxa255icInt(rtc->ic, PXA255_I_RTC_HZ, (rtc->RTSR & 2) != 0);
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}
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static Boolean pxa255rtcPrvMemAccessF(void* userData, UInt32 pa, UInt8 size, Boolean write, void* buf){
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Pxa255rtc* rtc = userData;
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UInt32 val = 0;
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if(size != 4) {
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err_str(__FILE__ ": Unexpected ");
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// err_str(write ? "write" : "read");
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// err_str(" of ");
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// err_dec(size);
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// err_str(" bytes to 0x");
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// err_hex(pa);
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// err_str("\r\n");
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return true; //we do not support non-word accesses
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}
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pa = (pa - PXA255_RTC_BASE) >> 2;
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if(write){
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val = *(UInt32*)buf;
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switch(pa){
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case 0:
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rtc->RCNR_offset = rtcCurTime() - val;
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break;
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case 1:
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rtc->RTAR = val;
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pxa255rtcPrvUpdate(rtc);
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break;
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case 2:
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rtc->RTSR = (val &~ 3UL) | ((rtc->RTSR &~ val) & 3UL);
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pxa255rtcPrvUpdate(rtc);
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break;
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case 3:
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if(!(rtc->RTTR & 0x80000000UL)) rtc->RTTR = val;
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break;
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}
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}
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else{
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switch(pa){
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case 0:
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val = rtcCurTime() - rtc->RCNR_offset;
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break;
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case 1:
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val = rtc->RTAR;
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break;
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case 2:
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val = rtc->RTSR;
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break;
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case 3:
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val = rtc->RTTR;
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break;
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}
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*(UInt32*)buf = val;
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}
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return true;
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}
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Boolean pxa255rtcInit(Pxa255rtc* rtc, ArmMem* physMem, Pxa255ic* ic){
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__mem_zero(rtc, sizeof(Pxa255rtc));
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rtc->ic = ic;
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rtc->RCNR_offset = 0;
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rtc->RTTR = 0x7FFF; //nice default value
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rtc->lastSeenTime = rtcCurTime();
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return memRegionAdd(physMem, PXA255_RTC_BASE, PXA255_RTC_SIZE, pxa255rtcPrvMemAccessF, rtc);
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}
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void pxa255rtcUpdate(Pxa255rtc* rtc){
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pxa255rtcPrvUpdate(rtc);
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}
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