/* $NetBSD: tc_3000_300.c,v 1.39 2021/05/07 16:58:34 thorpej Exp $ */

/*
 * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
 * All rights reserved.
 *
 * Author: Chris G. Demetriou
 *
 * Permission to use, copy, modify and distribute this software and
 * its documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie the
 * rights to redistribute these changes.
 */

#include <sys/cdefs.h>                  /* RCS ID & Copyright macro defns */

__KERNEL_RCSID(0, "$NetBSD: tc_3000_300.c,v 1.39 2021/05/07 16:58:34 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kmem.h>
#include <sys/cpu.h>

#include <machine/autoconf.h>
#include <machine/pte.h>

#include <dev/tc/tcvar.h>
#include <dev/tc/ioasicreg.h>
#include <alpha/tc/tc_conf.h>
#include <alpha/tc/tc_3000_300.h>

#include "wsdisplay.h"
#include "sfb.h"

#if NSFB > 0
extern int      sfb_cnattach(tc_addr_t);
#endif

static int      tc_3000_300_intrnull(void *);

#define C(x)    ((void *)(u_long)x)
#define KV(x)   (ALPHA_PHYS_TO_K0SEG(x))

/*
 * We have to read and modify the IOASIC registers directly, because
 * the TC option slot interrupt request and mask bits are stored there,
 * and the ioasic code isn't initted when we need to frob some interrupt
 * bits.
 */
#define DEC_3000_300_IOASIC_ADDR        KV(0x1a0000000)

const struct tc_slotdesc tc_3000_300_slots[] = {
        { KV(0x100000000), C(TC_3000_300_DEV_OPT0), },  /* 0 - opt slot 0 */
        { KV(0x120000000), C(TC_3000_300_DEV_OPT1), },  /* 1 - opt slot 1 */
        { KV(0x140000000), C(TC_3000_300_DEV_BOGUS), }, /* 2 - unused */
        { KV(0x160000000), C(TC_3000_300_DEV_BOGUS), }, /* 3 - unused */
        { KV(0x180000000), C(TC_3000_300_DEV_BOGUS), }, /* 4 - TCDS ASIC */
        { KV(0x1a0000000), C(TC_3000_300_DEV_BOGUS), }, /* 5 - IOCTL ASIC */
        { KV(0x1c0000000), C(TC_3000_300_DEV_BOGUS), }, /* 6 - CXTurbo */
};
const int tc_3000_300_nslots = __arraycount(tc_3000_300_slots);

const struct tc_builtin tc_3000_300_builtins[] = {
        { "PMAGB-BA",   6, 0x02000000, C(TC_3000_300_DEV_CXTURBO),      },
        { "FLAMG-IO",   5, 0x00000000, C(TC_3000_300_DEV_IOASIC),       },
        { "PMAZ-DS ",   4, 0x00000000, C(TC_3000_300_DEV_TCDS),         },
};
const int tc_3000_300_nbuiltins = __arraycount(tc_3000_300_builtins);

static struct tcintr {
        int     (*tci_func)(void *);
        void    *tci_arg;
        struct evcnt tci_evcnt;
} tc_3000_300_intr[TC_3000_300_NCOOKIES];

void
tc_3000_300_intr_setup(void)
{
        volatile uint32_t *imskp;
        char *cp;
        u_long i;

        /*
         * Disable all interrupts that we can (can't disable builtins).
         */
        imskp = (volatile uint32_t *)(DEC_3000_300_IOASIC_ADDR + IOASIC_IMSK);
        *imskp &= ~(IOASIC_INTR_300_OPT0 | IOASIC_INTR_300_OPT1);

        /*
         * Set up interrupt handlers.
         */
        for (i = 0; i < TC_3000_300_NCOOKIES; i++) {
                tc_3000_300_intr[i].tci_func = tc_3000_300_intrnull;
                tc_3000_300_intr[i].tci_arg = (void *)i;
                
                cp = kmem_asprintf("slot %lu", i);
                evcnt_attach_dynamic(&tc_3000_300_intr[i].tci_evcnt,
                    EVCNT_TYPE_INTR, NULL, "tc", cp);
        }
}

const struct evcnt *
tc_3000_300_intr_evcnt(device_t tcadev, void *cookie)
{
        u_long dev = (u_long)cookie;

#ifdef DIAGNOSTIC
        /* XXX bounds-check cookie. */
#endif

        return (&tc_3000_300_intr[dev].tci_evcnt);
}

void
tc_3000_300_intr_establish(device_t tcadev, void *cookie, tc_intrlevel_t level, int (*func)(void *), void *arg)
{
        volatile uint32_t *imskp;
        u_long dev = (u_long)cookie;

#ifdef DIAGNOSTIC
        /* XXX bounds-check cookie. */
#endif

        if (tc_3000_300_intr[dev].tci_func != tc_3000_300_intrnull)
                panic("tc_3000_300_intr_establish: cookie %lu twice", dev);

        const int s = splhigh();

        /* All TC systems are uniprocessors. */
        KASSERT(CPU_IS_PRIMARY(curcpu()));
        KASSERT(ncpu == 1);
        curcpu()->ci_nintrhand++;

        tc_3000_300_intr[dev].tci_func = func;
        tc_3000_300_intr[dev].tci_arg = arg;

        splx(s);

        imskp = (volatile uint32_t *)(DEC_3000_300_IOASIC_ADDR + IOASIC_IMSK);
        switch (dev) {
        case TC_3000_300_DEV_OPT0:
                *imskp |= IOASIC_INTR_300_OPT0;
                break;
        case TC_3000_300_DEV_OPT1:
                *imskp |= IOASIC_INTR_300_OPT1;
                break;
        default:
                /* interrupts for builtins always enabled */
                break;
        }
}

void
tc_3000_300_intr_disestablish(device_t tcadev, void *cookie)
{
        volatile uint32_t *imskp;
        u_long dev = (u_long)cookie;

#ifdef DIAGNOSTIC
        /* XXX bounds-check cookie. */
#endif

        if (tc_3000_300_intr[dev].tci_func == tc_3000_300_intrnull)
                panic("tc_3000_300_intr_disestablish: cookie %lu bad intr",
                    dev);

        imskp = (volatile uint32_t *)(DEC_3000_300_IOASIC_ADDR + IOASIC_IMSK);
        switch (dev) {
        case TC_3000_300_DEV_OPT0:
                *imskp &= ~IOASIC_INTR_300_OPT0;
                break;
        case TC_3000_300_DEV_OPT1:
                *imskp &= ~IOASIC_INTR_300_OPT1;
                break;
        default:
                /* interrupts for builtins always enabled */
                break;
        }

        const int s = splhigh();

        curcpu()->ci_nintrhand--;

        tc_3000_300_intr[dev].tci_func = tc_3000_300_intrnull;
        tc_3000_300_intr[dev].tci_arg = (void *)dev;

        splx(s);
}

static int
tc_3000_300_intrnull(void *val)
{

        panic("tc_3000_300_intrnull: uncaught TC intr for cookie %ld",
            (u_long)val);
}

void
tc_3000_300_iointr(void *arg, unsigned long vec)
{
        uint32_t tcir, ioasicir, ioasicimr;
        int ifound;

        KERNEL_LOCK(1, NULL);

#ifdef DIAGNOSTIC
        int s;
        if (vec != 0x800)
                panic("INVALID ASSUMPTION: vec 0x%lx, not 0x800", vec);
        s = splhigh();
        if (s != ALPHA_PSL_IPL_IO_HI)
                panic("INVALID ASSUMPTION: IPL %d, not %d", s,
                    ALPHA_PSL_IPL_IO_HI);
        splx(s);
#endif

        do {
                tc_syncbus();

                /* find out what interrupts/errors occurred */
                tcir = *(volatile uint32_t *)TC_3000_300_IR;
                ioasicir = *(volatile uint32_t *)
                    (DEC_3000_300_IOASIC_ADDR + IOASIC_INTR);
                ioasicimr = *(volatile uint32_t *)
                    (DEC_3000_300_IOASIC_ADDR + IOASIC_IMSK);
                tc_mb();

                /* Ignore interrupts that aren't enabled out. */
                ioasicir &= ioasicimr;

                /* clear the interrupts/errors we found. */
                *(volatile uint32_t *)TC_3000_300_IR = tcir;
                /* XXX can't clear TC option slot interrupts here? */
                tc_wmb();

                ifound = 0;

#define INCRINTRCNT(slot)       tc_3000_300_intr[slot].tci_evcnt.ev_count++

#define CHECKINTR(slot, flag)                                           \
                if (flag) {                                             \
                        ifound = 1;                                     \
                        INCRINTRCNT(slot);                              \
                        (*tc_3000_300_intr[slot].tci_func)              \
                            (tc_3000_300_intr[slot].tci_arg);           \
                }
                /* Do them in order of priority; highest slot # first. */
                CHECKINTR(TC_3000_300_DEV_CXTURBO,
                    tcir & TC_3000_300_IR_CXTURBO);
                CHECKINTR(TC_3000_300_DEV_IOASIC,
                    (tcir & TC_3000_300_IR_IOASIC) &&
                    (ioasicir & ~(IOASIC_INTR_300_OPT1|IOASIC_INTR_300_OPT0)));
                CHECKINTR(TC_3000_300_DEV_TCDS, tcir & TC_3000_300_IR_TCDS);
                CHECKINTR(TC_3000_300_DEV_OPT1,
                    ioasicir & IOASIC_INTR_300_OPT1);
                CHECKINTR(TC_3000_300_DEV_OPT0,
                    ioasicir & IOASIC_INTR_300_OPT0);
#undef CHECKINTR

#ifdef DIAGNOSTIC
#define PRINTINTR(msg, bits)                                            \
        if (tcir & bits)                                                \
                printf(msg);
                PRINTINTR("BCache tag parity error\n",
                    TC_3000_300_IR_BCTAGPARITY);
                PRINTINTR("TC overrun error\n", TC_3000_300_IR_TCOVERRUN);
                PRINTINTR("TC I/O timeout\n", TC_3000_300_IR_TCTIMEOUT);
                PRINTINTR("Bcache parity error\n",
                    TC_3000_300_IR_BCACHEPARITY);
                PRINTINTR("Memory parity error\n", TC_3000_300_IR_MEMPARITY);
#undef PRINTINTR
#endif
        } while (ifound);

        KERNEL_UNLOCK_ONE(NULL);
}

#if NWSDISPLAY > 0
/*
 * tc_3000_300_fb_cnattach --
 *      Attempt to map the CTB output device to a slot and attach the
 * framebuffer as the output side of the console.
 */
int
tc_3000_300_fb_cnattach(uint64_t turbo_slot)
{
        uint32_t output_slot;

        output_slot = turbo_slot & 0xffffffff;

        if (output_slot >= tc_3000_300_nslots) {
                return EINVAL;
        }

        if (output_slot == 0) {
#if NSFB > 0
                sfb_cnattach(KV(0x1c0000000) + 0x02000000);
                return 0;
#else
                return ENXIO;
#endif
        }

        return tc_fb_cnattach(tc_3000_300_slots[output_slot-1].tcs_addr);
}
#endif /* NWSDISPLAY */