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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: