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gemini_lpchc.c revision 1.1
      1  1.1  cliff /*	$NetBSD: gemini_lpchc.c,v 1.1 2008/11/09 09:15:42 cliff Exp $	*/
      2  1.1  cliff 
      3  1.1  cliff /*
      4  1.1  cliff  * GEMINI LPC Host Controller
      5  1.1  cliff  */
      6  1.1  cliff #include "opt_gemini.h"
      7  1.1  cliff #include "locators.h"
      8  1.1  cliff 
      9  1.1  cliff #include <sys/cdefs.h>
     10  1.1  cliff __KERNEL_RCSID(0, "$NetBSD: gemini_lpchc.c,v 1.1 2008/11/09 09:15:42 cliff Exp $");
     11  1.1  cliff 
     12  1.1  cliff #include <sys/param.h>
     13  1.1  cliff #include <sys/callout.h>
     14  1.1  cliff #include <sys/cdefs.h>
     15  1.1  cliff #include <sys/device.h>
     16  1.1  cliff #include <sys/kernel.h>
     17  1.1  cliff #include <sys/systm.h>
     18  1.1  cliff #include <sys/malloc.h>
     19  1.1  cliff 
     20  1.1  cliff #include <machine/param.h>
     21  1.1  cliff #include <machine/bus.h>
     22  1.1  cliff 
     23  1.1  cliff #include <arm/gemini/gemini_lpchcvar.h>
     24  1.1  cliff #include <arm/gemini/gemini_lpcvar.h>
     25  1.1  cliff #include <arm/gemini/gemini_reg.h>
     26  1.1  cliff 
     27  1.1  cliff static inline void
     28  1.1  cliff gemini_lpchc_sirq_cfg(bus_space_tag_t iot, bus_space_handle_t ioh,
     29  1.1  cliff 	bus_size_t offset, uint32_t bit, boolean_t doset)
     30  1.1  cliff {
     31  1.1  cliff 	uint32_t r;
     32  1.1  cliff 
     33  1.1  cliff 	r = bus_space_read_4(iot, ioh, offset);
     34  1.1  cliff 	if (doset)
     35  1.1  cliff 		r |= bit;
     36  1.1  cliff 	else
     37  1.1  cliff 		r &= ~bit;
     38  1.1  cliff 	bus_space_write_4(iot, ioh, offset, r);
     39  1.1  cliff }
     40  1.1  cliff 
     41  1.1  cliff static inline void
     42  1.1  cliff gemini_lpchc_sirq_ack(bus_space_tag_t iot, bus_space_handle_t ioh,
     43  1.1  cliff 	uint32_t bit)
     44  1.1  cliff {
     45  1.1  cliff 	uint32_t r;
     46  1.1  cliff 
     47  1.1  cliff 	r = bus_space_read_4(iot, ioh, GEMINI_LPCHC_SERIRQSTS);
     48  1.1  cliff 	r &= bit;
     49  1.1  cliff 	if (r != 0)
     50  1.1  cliff 		bus_space_write_4(iot, ioh, GEMINI_LPCHC_SERIRQSTS, r);
     51  1.1  cliff }
     52  1.1  cliff 
     53  1.1  cliff static inline void
     54  1.1  cliff gemini_lpchc_sirq_disable(bus_space_tag_t iot, bus_space_handle_t ioh)
     55  1.1  cliff {
     56  1.1  cliff 	uint32_t r;
     57  1.1  cliff 
     58  1.1  cliff 	r = bus_space_read_4(iot, ioh, GEMINI_LPCHC_IRQCTL);
     59  1.1  cliff 	r &= ~LPCHC_IRQCTL_SIRQEN;
     60  1.1  cliff 	bus_space_write_4(iot, ioh, GEMINI_LPCHC_IRQCTL, r);
     61  1.1  cliff }
     62  1.1  cliff 
     63  1.1  cliff static inline void
     64  1.1  cliff gemini_lpchc_sirq_enable(bus_space_tag_t iot, bus_space_handle_t ioh)
     65  1.1  cliff {
     66  1.1  cliff 	uint32_t r;
     67  1.1  cliff 
     68  1.1  cliff 	r = bus_space_read_4(iot, ioh, GEMINI_LPCHC_IRQCTL);
     69  1.1  cliff 	r |= LPCHC_IRQCTL_SIRQEN;
     70  1.1  cliff 	r |= LPCHC_IRQCTL_SIRQMS;	/* XXX "continuous mode" */
     71  1.1  cliff 	r |= IRQCTL_SIRQFW_8;		/* XXX SIRW Frame Width 8 clocks */
     72  1.1  cliff 	bus_space_write_4(iot, ioh, GEMINI_LPCHC_IRQCTL, r);
     73  1.1  cliff #if 0
     74  1.1  cliff 	delay(10);			/* wait 1 serial IRQ cycle */
     75  1.1  cliff 	r &= ~LPCHC_IRQCTL_SIRQMS;	/* XXX "quiet mode" */
     76  1.1  cliff 	bus_space_write_4(iot, ioh, GEMINI_LPCHC_IRQCTL, r);
     77  1.1  cliff #endif
     78  1.1  cliff }
     79  1.1  cliff 
     80  1.1  cliff static inline void
     81  1.1  cliff gemini_lpchc_intrq_init(gemini_lpchc_softc_t *sc)
     82  1.1  cliff {
     83  1.1  cliff 	SIMPLEQ_INIT(&sc->sc_intrq);
     84  1.1  cliff }
     85  1.1  cliff 
     86  1.1  cliff static inline int
     87  1.1  cliff gemini_lpchc_intrq_empty(gemini_lpchc_softc_t *sc)
     88  1.1  cliff {
     89  1.1  cliff 	return SIMPLEQ_EMPTY(&sc->sc_intrq);
     90  1.1  cliff }
     91  1.1  cliff 
     92  1.1  cliff static inline void *
     93  1.1  cliff gemini_lpchc_intrq_insert(gemini_lpchc_softc_t *sc, int (*func)(void *),
     94  1.1  cliff 	void *arg, uint32_t bit, boolean_t isedge)
     95  1.1  cliff {
     96  1.1  cliff 	gemini_lpchc_intrq_t *iqp;
     97  1.1  cliff 
     98  1.1  cliff         iqp = malloc(sizeof(*iqp), M_DEVBUF, M_NOWAIT|M_ZERO);
     99  1.1  cliff         if (iqp == NULL) {
    100  1.1  cliff 		printf("gemini_lpchc_intrq_insert: malloc failed\n");
    101  1.1  cliff 		return NULL;
    102  1.1  cliff 	}
    103  1.1  cliff 
    104  1.1  cliff         iqp->iq_func = func;
    105  1.1  cliff         iqp->iq_arg = arg;
    106  1.1  cliff         iqp->iq_bit = bit;
    107  1.1  cliff         iqp->iq_isedge = isedge;
    108  1.1  cliff         SIMPLEQ_INSERT_TAIL(&sc->sc_intrq, iqp, iq_q);
    109  1.1  cliff 
    110  1.1  cliff 	return (void *)iqp;
    111  1.1  cliff }
    112  1.1  cliff 
    113  1.1  cliff static inline void
    114  1.1  cliff gemini_lpchc_intrq_remove(gemini_lpchc_softc_t *sc, void *cookie)
    115  1.1  cliff {
    116  1.1  cliff 	gemini_lpchc_intrq_t *iqp;
    117  1.1  cliff 
    118  1.1  cliff 	SIMPLEQ_FOREACH(iqp, &sc->sc_intrq, iq_q) {
    119  1.1  cliff 		if ((void *)iqp == cookie) {
    120  1.1  cliff 			SIMPLEQ_REMOVE(&sc->sc_intrq,
    121  1.1  cliff 				iqp, gemini_lpchc_intrq, iq_q);
    122  1.1  cliff 			free(iqp, M_DEVBUF);
    123  1.1  cliff 			return;
    124  1.1  cliff 		}
    125  1.1  cliff 	}
    126  1.1  cliff }
    127  1.1  cliff 
    128  1.1  cliff static inline int
    129  1.1  cliff gemini_lpchc_intrq_dispatch(gemini_lpchc_softc_t *sc)
    130  1.1  cliff {
    131  1.1  cliff 	gemini_lpchc_intrq_t *iqp;
    132  1.1  cliff 	uint32_t r;
    133  1.1  cliff 	int rv = 0;
    134  1.1  cliff 
    135  1.1  cliff 	r = bus_space_read_4(sc->sc_iot, sc->sc_ioh, GEMINI_LPCHC_SERIRQSTS);
    136  1.1  cliff 	r &= ~LPCHC_SERIRQSTS_RESV;
    137  1.1  cliff 	SIMPLEQ_FOREACH(iqp, &sc->sc_intrq, iq_q) {
    138  1.1  cliff 		if ((r & iqp->iq_bit) != 0) {
    139  1.1  cliff 			if (iqp->iq_isedge) {
    140  1.1  cliff 				gemini_lpchc_sirq_ack(sc->sc_iot, sc->sc_ioh,
    141  1.1  cliff 					iqp->iq_bit);
    142  1.1  cliff 			}
    143  1.1  cliff 			rv |= (*iqp->iq_func)(iqp->iq_arg);
    144  1.1  cliff 		}
    145  1.1  cliff 	}
    146  1.1  cliff 	return (rv != 0);
    147  1.1  cliff }
    148  1.1  cliff 
    149  1.1  cliff void
    150  1.1  cliff gemini_lpchc_init(lpcintrtag_t tag)
    151  1.1  cliff {
    152  1.1  cliff 	gemini_lpchc_softc_t *sc = tag;
    153  1.1  cliff 	uint32_t r;
    154  1.1  cliff 
    155  1.1  cliff 	gemini_lpchc_intrq_init(sc);
    156  1.1  cliff 
    157  1.1  cliff 	r = bus_space_read_4(sc->sc_iot, sc->sc_ioh, GEMINI_LPCHC_CSR);
    158  1.1  cliff 	r |= LPCHC_CSR_BEN;
    159  1.1  cliff 	bus_space_write_4(sc->sc_iot, sc->sc_ioh, GEMINI_LPCHC_CSR, r);
    160  1.1  cliff }
    161  1.1  cliff 
    162  1.1  cliff void *
    163  1.1  cliff gemini_lpchc_intr_establish(lpcintrtag_t tag, uint irq,
    164  1.1  cliff 	int ipl, int type, int (*func)(void *), void *arg)
    165  1.1  cliff {
    166  1.1  cliff 	gemini_lpchc_softc_t *sc = tag;
    167  1.1  cliff 	bus_space_tag_t iot = sc->sc_iot;
    168  1.1  cliff 	bus_space_handle_t ioh = sc->sc_ioh;
    169  1.1  cliff 	uint32_t bit;
    170  1.1  cliff 	boolean_t isedge;
    171  1.1  cliff 	boolean_t ishigh;
    172  1.1  cliff 	void *ih;
    173  1.1  cliff 
    174  1.1  cliff 	isedge = ((type == IST_EDGE_RISING) || (type == IST_EDGE_FALLING));
    175  1.1  cliff 	ishigh = ((type == IST_EDGE_RISING) || (type == IST_LEVEL_HIGH));
    176  1.1  cliff 
    177  1.1  cliff 	if (irq >= GEMINI_LPCHC_NSERIRQ) {
    178  1.1  cliff 		printf("%s: bad irq %d\n", __FUNCTION__, irq);
    179  1.1  cliff 		return NULL;
    180  1.1  cliff 	}
    181  1.1  cliff #if 0
    182  1.1  cliff 	bit = 1 << irq;
    183  1.1  cliff #else
    184  1.1  cliff 	bit = (1 << GEMINI_LPCHC_NSERIRQ) -1;	/* XXX */
    185  1.1  cliff #endif
    186  1.1  cliff 
    187  1.1  cliff 	/* set IRQ type */
    188  1.1  cliff 	gemini_lpchc_sirq_cfg(iot, ioh, GEMINI_LPCHC_SERIRQTYP,
    189  1.1  cliff 		bit, isedge);
    190  1.1  cliff 
    191  1.1  cliff 	/* set IRQ polarity */
    192  1.1  cliff 	gemini_lpchc_sirq_cfg(iot, ioh, GEMINI_LPCHC_SERIRQPOLARITY,
    193  1.1  cliff 		bit, ishigh);
    194  1.1  cliff 
    195  1.1  cliff 	/* ack a-priori edge status */
    196  1.1  cliff 	if (isedge)
    197  1.1  cliff 		gemini_lpchc_sirq_ack(iot, ioh, bit);
    198  1.1  cliff 
    199  1.1  cliff 	if (gemini_lpchc_intrq_empty(sc))
    200  1.1  cliff 		gemini_lpchc_sirq_enable(iot, ioh);
    201  1.1  cliff 
    202  1.1  cliff 	ih = gemini_lpchc_intrq_insert(sc, func, arg, bit, isedge);
    203  1.1  cliff 	if (ih == NULL)
    204  1.1  cliff 		if (gemini_lpchc_intrq_empty(sc))
    205  1.1  cliff 			gemini_lpchc_sirq_disable(iot, ioh);
    206  1.1  cliff 
    207  1.1  cliff 	return ih;
    208  1.1  cliff }
    209  1.1  cliff 
    210  1.1  cliff void
    211  1.1  cliff gemini_lpchc_intr_disestablish(lpcintrtag_t tag, void *ih)
    212  1.1  cliff {
    213  1.1  cliff 	gemini_lpchc_softc_t *sc = tag;
    214  1.1  cliff 
    215  1.1  cliff 	gemini_lpchc_intrq_remove(sc, ih);
    216  1.1  cliff 	if (gemini_lpchc_intrq_empty(sc))
    217  1.1  cliff 		gemini_lpchc_sirq_disable(sc->sc_iot, sc->sc_ioh);
    218  1.1  cliff }
    219  1.1  cliff 
    220  1.1  cliff int
    221  1.1  cliff gemini_lpchc_intr(void *arg)
    222  1.1  cliff {
    223  1.1  cliff 	gemini_lpchc_softc_t *sc = arg;
    224  1.1  cliff 	int rv;
    225  1.1  cliff 
    226  1.1  cliff printf("%s: enter\n", __FUNCTION__);
    227  1.1  cliff 	rv = gemini_lpchc_intrq_dispatch(sc);
    228  1.1  cliff printf("%s: exit\n", __FUNCTION__);
    229  1.1  cliff 
    230  1.1  cliff 	return rv;
    231  1.1  cliff }
    232  1.1  cliff 
    233