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Annotation of funnyos/arch/testarm/dev/tartc.c, Revision 1.6

1.1       init        1: /*
1.6     ! init        2:  * $Id: tartc.c,v 1.5 2007/11/06 22:57:45 init Exp $
1.1       init        3:  */
                      4: #include <sys/types.h>
                      5: #include <sys/device.h>
1.2       init        6: #include <sys/bus.h>
                      7:
1.5       init        8: #include <sys/kern_time.h>
1.2       init        9: #include <arch/testarm/dev/tartcvar.h>
                     10: #include <arch/testarm/dev/tartcreg.h>
1.1       init       11: #include <libkern/printf.h>
                     12:
                     13: /*
                     14:  * testarm Real Time Clock driver.
                     15:  */
1.2       init       16: int    tartc_attach(struct device *, uint32_t loc, uint8_t flags);
1.3       init       17: void   tartc_interrupt(struct device *);
1.5       init       18: void   tartc_sethz(uint8_t hz);
                     19: uint32_t tartc_getsec(void);
                     20: uint32_t tartc_getusec(void);
1.2       init       21:
                     22:
1.5       init       23: /* default tartc device to use; will bind to first tartc instance */
                     24: struct tartc_dd *tartcdd = NULL;
                     25: extern struct rtcops sysrtcops;
                     26:
1.2       init       27: struct driver tartc_dr = {
                     28:        sizeof(struct tartc_dd),
                     29:        tartc_attach,
1.3       init       30:        NULL,
                     31:        tartc_interrupt
1.2       init       32: };
1.1       init       33:
                     34:
                     35: int
1.2       init       36: tartc_attach(struct device *self, uint32_t loc, uint8_t flags)
1.1       init       37: {
1.2       init       38:        struct tartc_dd *ddp = self->dv_devdata;
                     39:        uint32_t seconds;
1.1       init       40:
1.2       init       41:        /* acquire bus_handle from parent */
                     42:        ddp->td_bushandlep = self->dv_parent->dv_aux;
                     43:
                     44:        /* save our location on parent (or use default if loc == 0) */
                     45:        ddp->td_ioaddr = (loc != 0) ? loc : TARTC_REG_BASE;
                     46:
                     47:        /*
                     48:         * Read seconds past Epoch.
                     49:         */
                     50:        /* trigger clock update on host */
                     51:        bus_write_1(ddp->td_bushandlep, ddp->td_ioaddr + TARTC_OFF_CLOCKUPDATE, 1);
                     52:
                     53:        /* get seconds past Epoch */
                     54:        seconds = bus_read_4(ddp->td_bushandlep, ddp->td_ioaddr + TARTC_OFF_READSECONDS);
                     55:
                     56:        printf("testarm Real Time Clock (%d seconds past Epoch)\n", seconds);
1.1       init       57:
1.5       init       58:        /* set default tartc */
                     59:        tartcdd = ddp;
                     60:
                     61:        /* fill-in rtcops to be used by kern_time */
                     62:        sysrtcops.ro_sethz = tartc_sethz;
                     63:        sysrtcops.ro_getsec = tartc_getsec;
                     64:        sysrtcops.ro_getusec = tartc_getusec;
1.4       init       65:
1.1       init       66:        return(0);
1.3       init       67:
                     68: }
                     69:
                     70:
                     71: void
1.5       init       72: tartc_sethz(uint8_t hz)
                     73: {
                     74:        /*
                     75:         * Set timer frequency.
                     76:         */
                     77:        if (tartcdd == NULL)
1.6     ! init       78:                panic("tartc_sethz: can't calibrate timer: default device not configured\n");
1.5       init       79:
                     80:        bus_write_1(tartcdd->td_bushandlep, tartcdd->td_ioaddr + TARTC_OFF_TMRINTRFREQ, hz);
                     81: }
                     82:
                     83:
                     84: uint32_t
                     85: tartc_getsec(void)
                     86: {
                     87:        /*
                     88:         * Get seconds.
                     89:         */
                     90:        if (tartcdd == NULL)
                     91:                panic("tartc_getsec: can't get seconds from rtc: default device not configured\n");
                     92:
                     93:        /* trigger clock update on host */
                     94:        bus_write_1(tartcdd->td_bushandlep, tartcdd->td_ioaddr + TARTC_OFF_CLOCKUPDATE, 1);
                     95:
                     96:        return( bus_read_4(tartcdd->td_bushandlep, tartcdd->td_ioaddr + TARTC_OFF_READSECONDS) );
                     97: }
                     98:
                     99:
                    100: uint32_t
                    101: tartc_getusec(void)
                    102: {
                    103:        /*
                    104:         * Get microseconds.
                    105:         */
                    106:        if (tartcdd == NULL)
                    107:                panic("tartc_getusec: can't get microseconds from rtc: default device not configured\n");
                    108:
                    109:        /* trigger clock update on host */
                    110:        bus_write_1(tartcdd->td_bushandlep, tartcdd->td_ioaddr + TARTC_OFF_CLOCKUPDATE, 1);
                    111:
                    112:        return( bus_read_4(tartcdd->td_bushandlep, tartcdd->td_ioaddr + TARTC_OFF_READUSECONDS) );
                    113: }
                    114:
                    115:
                    116: void
1.3       init      117: tartc_interrupt(struct device *self)
                    118: {
1.4       init      119:        struct tartc_dd *ddp = self->dv_devdata;
                    120:
1.5       init      121:        /* process system tick */
                    122:        sysclock();
                    123:
1.4       init      124:        /* acknowledge one timer intr */
                    125:        bus_write_1(ddp->td_bushandlep, ddp->td_ioaddr + TARTC_OFF_TMRINTRACK, 0xff);
1.1       init      126: }
                    127: