Annotation of funnyos/arch/sam7s64/dev/sartt.c, Revision 1.1
1.1 ! nbrk 1: /*
! 2: * $Id$
! 3: */
! 4: #include <sys/types.h>
! 5: #include <sys/device.h>
! 6: #include <sys/bus.h>
! 7:
! 8: #include <sys/kern_time.h>
! 9: #include <arch/sam7s64/dev/sarttvar.h>
! 10: #include <arch/sam7s64/dev/at91sam7.h>
! 11:
! 12: #include <arch/sam7s64/dev/saaicvar.h> /* XXX */
! 13: #include <libkern/printf.h>
! 14:
! 15: /*
! 16: * Real Time Timer.
! 17: */
! 18: int sartt_attach(struct device *, uint32_t loc, uint8_t flags);
! 19: void sartt_interrupt(struct device *);
! 20: void sartt_sethz(uint8_t hz);
! 21: uint32_t sartt_getsec(void);
! 22: uint32_t sartt_getusec(void);
! 23:
! 24:
! 25: /* default sartt device to use; will bind to first sartt instance */
! 26: struct sartt_dd *sarttdd = NULL;
! 27: extern struct rtcops sysrtcops;
! 28:
! 29: struct driver sartt_dr = {
! 30: sizeof(struct sartt_dd),
! 31: sartt_attach,
! 32: NULL,
! 33: sartt_interrupt
! 34: };
! 35:
! 36:
! 37: int
! 38: sartt_attach(struct device *self, uint32_t loc, uint8_t flags)
! 39: {
! 40: struct sartt_dd *ddp = self->dv_devdata;
! 41: uint32_t value;
! 42:
! 43: /* acquire bus_handle from parent */
! 44: ddp->sr_bhp = self->dv_parent->dv_aux;
! 45:
! 46: /* read counter value */
! 47: value = bus_read_4(ddp->sr_bhp, (uint32_t)AT91C_RTTC_RTVR);
! 48:
! 49: printf("SAM7 Real Time Timer (value=%d)\n", value);
! 50:
! 51: /* set default sartt */
! 52: sarttdd = ddp;
! 53:
! 54: /* fill-in rtcops to be used by kern_time */
! 55: sysrtcops.ro_sethz = sartt_sethz;
! 56: sysrtcops.ro_getsec = sartt_getsec;
! 57: sysrtcops.ro_getusec = sartt_getusec;
! 58:
! 59: return(0);
! 60:
! 61: }
! 62:
! 63:
! 64: void
! 65: sartt_sethz(uint8_t hz)
! 66: {
! 67: /*
! 68: * Set timer frequency.
! 69: * RTT is clocked from 32768Hz SCK (Slow Clock) oscillator.
! 70: * Default prescaler value is 2^16 (32768) means that after reset HZ is 1 (1 second).
! 71: */
! 72: if (sarttdd == NULL)
! 73: panic("sartt_sethz: can't calibrate timer: default device not configured\n");
! 74:
! 75: /* program prescaler (which is 2^16/HZ) and enable timer interrupts */
! 76: bus_write_4(sarttdd->sr_bhp, (uint32_t)AT91C_RTTC_RTMR, AT91C_RTTC_RTTINCIEN | (32768 / hz));
! 77:
! 78: /* enable coresponding interrupt source in AIC */
! 79: saaic_unmask_intr(1);
! 80: /* XXX should not be here */
! 81: }
! 82:
! 83:
! 84: uint32_t
! 85: sartt_getsec(void)
! 86: {
! 87: /*
! 88: * Get seconds.
! 89: */
! 90: if (sarttdd == NULL)
! 91: panic("sartt_getsec: can't get seconds from rtc: default device not configured\n");
! 92:
! 93: /* TODO */
! 94: return(0);
! 95: }
! 96:
! 97:
! 98: uint32_t
! 99: sartt_getusec(void)
! 100: {
! 101: /*
! 102: * Get microseconds.
! 103: */
! 104: if (sarttdd == NULL)
! 105: panic("sartt_getusec: can't get microseconds from rtc: default device not configured\n");
! 106:
! 107: /* TODO */
! 108: return(0);
! 109: }
! 110:
! 111:
! 112: void
! 113: sartt_interrupt(struct device *self)
! 114: {
! 115: /* process system tick */
! 116: sysclock();
! 117: }
! 118:
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