/*      $NetBSD: bztzsc.c,v 1.38 2019/01/08 19:41:09 jdolecek Exp $ */

/*
 * Copyright (c) 1997 Michael L. Hitch
 * Copyright (c) 1996 Ignatios Souvatzis
 * Copyright (c) 1982, 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

/*
 * Initial amiga Blizzard 2060 driver by Ingatios Souvatzis.  Conversion to
 * 53c9x MI driver by Michael L. Hitch (mhitch@montana.edu).
 */

#ifdef __m68k__
#include "opt_m68k_arch.h"
#endif

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: bztzsc.c,v 1.38 2019/01/08 19:41:09 jdolecek Exp $");

#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/device.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/queue.h>

#include <dev/scsipi/scsi_all.h>
#include <dev/scsipi/scsipi_all.h>
#include <dev/scsipi/scsiconf.h>
#include <dev/scsipi/scsi_message.h>

#include <machine/cpu.h>

#include <dev/ic/ncr53c9xreg.h>
#include <dev/ic/ncr53c9xvar.h>

#include <amiga/amiga/isr.h>
#include <amiga/dev/bztzscvar.h>
#include <amiga/dev/zbusvar.h>

#ifdef __powerpc__
#define badaddr(a)      badaddr_read(a, 2, NULL)
#endif

int     bztzscmatch(device_t, cfdata_t, void *);
void    bztzscattach(device_t, device_t, void *);

/* Linkup to the rest of the kernel */
CFATTACH_DECL_NEW(bztzsc, sizeof(struct bztzsc_softc),
    bztzscmatch, bztzscattach, NULL, NULL);

/*
 * Functions and the switch for the MI code.
 */
uint8_t bztzsc_read_reg(struct ncr53c9x_softc *, int);
void    bztzsc_write_reg(struct ncr53c9x_softc *, int, uint8_t);
int     bztzsc_dma_isintr(struct ncr53c9x_softc *);
void    bztzsc_dma_reset(struct ncr53c9x_softc *);
int     bztzsc_dma_intr(struct ncr53c9x_softc *);
int     bztzsc_dma_setup(struct ncr53c9x_softc *, uint8_t **,
            size_t *, int, size_t *);
void    bztzsc_dma_go(struct ncr53c9x_softc *);
void    bztzsc_dma_stop(struct ncr53c9x_softc *);
int     bztzsc_dma_isactive(struct ncr53c9x_softc *);

struct ncr53c9x_glue bztzsc_glue = {
        bztzsc_read_reg,
        bztzsc_write_reg,
        bztzsc_dma_isintr,
        bztzsc_dma_reset,
        bztzsc_dma_intr,
        bztzsc_dma_setup,
        bztzsc_dma_go,
        bztzsc_dma_stop,
        bztzsc_dma_isactive,
        NULL,
};

/* Maximum DMA transfer length to reduce impact on high-speed serial input */
u_long bztzsc_max_dma = 1024;
extern int ser_open_speed;

u_long bztzsc_cnt_pio = 0;      /* number of PIO transfers */
u_long bztzsc_cnt_dma = 0;      /* number of DMA transfers */
u_long bztzsc_cnt_dma2 = 0;     /* number of DMA transfers broken up */
u_long bztzsc_cnt_dma3 = 0;     /* number of pages combined */

#ifdef DEBUG
struct {
        uint8_t hardbits;
        uint8_t status;
        uint8_t xx;
        uint8_t yy;
} bztzsc_trace[128];
int bztzsc_trace_ptr = 0;
int bztzsc_trace_enable = 1;
void bztzsc_dump(void);
#endif

/*
 * if we are a Phase5 Blizzard 2060 SCSI
 */
int
bztzscmatch(device_t parent, cfdata_t cf, void *aux)
{
        struct zbus_args *zap;
        volatile uint8_t *regs;

        zap = aux;
        if (zap->manid != 0x2140 || zap->prodid != 24)
                return 0;
        regs = &((volatile uint8_t *)zap->va)[0x1ff00];
        if (badaddr((void *)__UNVOLATILE(regs)))
                return 0;
        regs[NCR_CFG1 * 4] = 0;
        regs[NCR_CFG1 * 4] = NCRCFG1_PARENB | 7;
        delay(5);
        if (regs[NCR_CFG1 * 4] != (NCRCFG1_PARENB | 7))
                return 0;
        return 1;
}

/*
 * Attach this instance, and then all the sub-devices
 */
void
bztzscattach(device_t parent, device_t self, void *aux)
{
        struct bztzsc_softc *bsc = device_private(self);
        struct ncr53c9x_softc *sc = &bsc->sc_ncr53c9x;
        struct zbus_args  *zap;
        extern u_long scsi_nosync;
        extern int shift_nosync;
        extern int ncr53c9x_debug;

        /*
         * Set up the glue for MI code early; we use some of it here.
         */
        sc->sc_dev = self;
        sc->sc_glue = &bztzsc_glue;

        /*
         * Save the regs
         */
        zap = aux;
        bsc->sc_reg = &((volatile uint8_t *)zap->va)[0x1ff00];
        bsc->sc_dmabase = &bsc->sc_reg[0xf0];

        sc->sc_freq = 40;               /* Clocked at 40 MHz */

        aprint_normal(": address %p", bsc->sc_reg);

        sc->sc_id = 7;

        /*
         * It is necessary to try to load the 2nd config register here,
         * to find out what rev the FAS chip is, else the ncr53c9x_reset
         * will not set up the defaults correctly.
         */
        sc->sc_cfg1 = sc->sc_id | NCRCFG1_PARENB;
        sc->sc_cfg2 = NCRCFG2_SCSI2 | NCRCFG2_FE;
        sc->sc_cfg3 = 0x08 /*FCLK*/ | NCRESPCFG3_FSCSI | NCRESPCFG3_CDB;
        sc->sc_rev = NCR_VARIANT_FAS216;

        /*
         * This is the value used to start sync negotiations
         * Note that the NCR register "SYNCTP" is programmed
         * in "clocks per byte", and has a minimum value of 4.
         * The SCSI period used in negotiation is one-fourth
         * of the time (in nanoseconds) needed to transfer one byte.
         * Since the chip's clock is given in MHz, we have the following
         * formula: 4 * period = (1000 / freq) * 4
         */
        sc->sc_minsync = 1000 / sc->sc_freq;

        /*
         * get flags from -I argument and set cf_flags.
         * NOTE: low 8 bits are to disable disconnect, and the next
         *       8 bits are to disable sync.
         */
        device_cfdata(self)->cf_flags |= (scsi_nosync >> shift_nosync)
            & 0xffff;
        shift_nosync += 16;

        /* Use next 16 bits of -I argument to set ncr53c9x_debug flags */
        ncr53c9x_debug |= (scsi_nosync >> shift_nosync) & 0xffff;
        shift_nosync += 16;

#if 1
        if (((scsi_nosync >> shift_nosync) & 0xff00) == 0xff00)
                sc->sc_minsync = 0;
#endif

        /* Really no limit, but since we want to fit into the TCR... */
        sc->sc_maxxfer = 64 * 1024;

        bsc->sc_reg[0xe0] = BZTZSC_PB_LED;      /* Turn LED off */

        /*
         * Configure interrupts.
         */
        bsc->sc_isr.isr_intr = ncr53c9x_intr;
        bsc->sc_isr.isr_arg  = sc;
        bsc->sc_isr.isr_ipl  = 2;
        add_isr(&bsc->sc_isr);

        /*
         * Now try to attach all the sub-devices
         */
        sc->sc_adapter.adapt_request = ncr53c9x_scsipi_request;
        sc->sc_adapter.adapt_minphys = minphys;
        ncr53c9x_attach(sc);
}

/*
 * Glue functions.
 */

uint8_t
bztzsc_read_reg(struct ncr53c9x_softc *sc, int reg)
{
        struct bztzsc_softc *bsc = (struct bztzsc_softc *)sc;

        return bsc->sc_reg[reg * 4];
}

void
bztzsc_write_reg(struct ncr53c9x_softc *sc, int reg, uint8_t val)
{
        struct bztzsc_softc *bsc = (struct bztzsc_softc *)sc;
        uint8_t v = val;

        bsc->sc_reg[reg * 4] = v;
#ifdef DEBUG
if (bztzsc_trace_enable/* && sc->sc_nexus && sc->sc_nexus->xs->xs_control & XS_CTL_POLL*/ &&
  reg == NCR_CMD/* && bsc->sc_active*/) {
  bztzsc_trace[(bztzsc_trace_ptr - 1) & 127].yy = v;
/*  printf(" cmd %x", v);*/
}
#endif
}

int
bztzsc_dma_isintr(struct ncr53c9x_softc *sc)
{
        struct bztzsc_softc *bsc = (struct bztzsc_softc *)sc;

        if ((bsc->sc_reg[NCR_STAT * 4] & NCRSTAT_INT) == 0)
                return 0;

        if (sc->sc_state == NCR_CONNECTED)
                bsc->sc_reg[0xe0] = 0;                  /* Turn LED on */
        else
                bsc->sc_reg[0xe0] = BZTZSC_PB_LED;      /* Turn LED off */

#ifdef DEBUG
if (/*sc->sc_nexus && sc->sc_nexus->xs->xs_control & XS_CTL_POLL &&*/ bztzsc_trace_enable) {
  bztzsc_trace[bztzsc_trace_ptr].status = bsc->sc_reg[NCR_STAT * 4];
  bztzsc_trace[bztzsc_trace_ptr].xx = bsc->sc_reg[NCR_CMD * 4];
  bztzsc_trace[bztzsc_trace_ptr].yy = bsc->sc_active;
  bztzsc_trace_ptr = (bztzsc_trace_ptr + 1) & 127;
}
#endif
        return 1;
}

void
bztzsc_dma_reset(struct ncr53c9x_softc *sc)
{
        struct bztzsc_softc *bsc = (struct bztzsc_softc *)sc;

        bsc->sc_active = 0;
}

int
bztzsc_dma_intr(struct ncr53c9x_softc *sc)
{
        register struct bztzsc_softc *bsc = (struct bztzsc_softc *)sc;
        register int    cnt;

        NCR_DMA(("bztzsc_dma_intr: cnt %d int %x stat %x fifo %d ",
            bsc->sc_dmasize, sc->sc_espintr, sc->sc_espstat,
            bsc->sc_reg[NCR_FFLAG * 4] & NCRFIFO_FF));
        if (bsc->sc_active == 0) {
                printf("bztzsc_intr--inactive DMA\n");
                return -1;
        }

        /* update sc_dmaaddr and sc_pdmalen */
        cnt = bsc->sc_reg[NCR_TCL * 4];
        cnt += bsc->sc_reg[NCR_TCM * 4] << 8;
        cnt += bsc->sc_reg[NCR_TCH * 4] << 16;
        if (!bsc->sc_datain) {
                cnt += bsc->sc_reg[NCR_FFLAG * 4] & NCRFIFO_FF;
                bsc->sc_reg[NCR_CMD * 4] = NCRCMD_FLUSH;
        }
        cnt = bsc->sc_dmasize - cnt;    /* number of bytes transferred */
        NCR_DMA(("DMA xferred %d\n", cnt));
        if (bsc->sc_xfr_align) {
                memcpy(*bsc->sc_dmaaddr, bsc->sc_alignbuf, cnt);
                bsc->sc_xfr_align = 0;
        }
        *bsc->sc_dmaaddr += cnt;
        *bsc->sc_pdmalen -= cnt;
        bsc->sc_active = 0;
        return 0;
}

int
bztzsc_dma_setup(struct ncr53c9x_softc *sc, uint8_t **addr, size_t *len,
                 int datain, size_t *dmasize)
{
        struct bztzsc_softc *bsc = (struct bztzsc_softc *)sc;
        paddr_t pa;
        uint8_t *ptr;
        size_t xfer;

        bsc->sc_dmaaddr = addr;
        bsc->sc_pdmalen = len;
        bsc->sc_datain = datain;
        bsc->sc_dmasize = *dmasize;
        /*
         * DMA can be nasty for high-speed serial input, so limit the
         * size of this DMA operation if the serial port is running at
         * a high speed (higher than 19200 for now - should be adjusted
         * based on CPU type and speed?).
         * XXX - add serial speed check XXX
         */
        if (ser_open_speed > 19200 && bztzsc_max_dma != 0 &&
            bsc->sc_dmasize > bztzsc_max_dma)
                bsc->sc_dmasize = bztzsc_max_dma;
        ptr = *addr;                    /* Kernel virtual address */
        pa = kvtop(ptr);                /* Physical address of DMA */
        xfer = uimin(bsc->sc_dmasize, PAGE_SIZE - (pa & (PAGE_SIZE - 1)));
        bsc->sc_xfr_align = 0;
        /*
         * If output and unaligned, stuff odd byte into FIFO
         */
        if (datain == 0 && (int)ptr & 1) {
                NCR_DMA(("bztzsc_dma_setup: align byte written to fifo\n"));
                pa++;
                xfer--;                 /* XXXX CHECK THIS !!!! XXXX */
                bsc->sc_reg[NCR_FIFO * 4] = *ptr++;
        }
        /*
         * If unaligned address, read unaligned bytes into alignment buffer
         */
        else if ((int)ptr & 1) {
                pa = kvtop((void *)&bsc->sc_alignbuf);
                xfer = bsc->sc_dmasize = uimin(xfer, sizeof(bsc->sc_alignbuf));
                NCR_DMA(("bztzsc_dma_setup: align read by %d bytes\n", xfer));
                bsc->sc_xfr_align = 1;
        }
++bztzsc_cnt_dma;               /* number of DMA operations */

        while (xfer < bsc->sc_dmasize) {
                if ((pa + xfer) != kvtop(*addr + xfer))
                        break;
                if ((bsc->sc_dmasize - xfer) < PAGE_SIZE)
                        xfer = bsc->sc_dmasize;
                else
                        xfer += PAGE_SIZE;
++bztzsc_cnt_dma3;
        }
if (xfer != *len)
  ++bztzsc_cnt_dma2;

        bsc->sc_dmasize = xfer;
        *dmasize = bsc->sc_dmasize;
        bsc->sc_pa = pa;
#if defined(M68040) || defined(M68060)
        if (mmutype == MMU_68040) {
                if (bsc->sc_xfr_align) {
                        dma_cachectl(bsc->sc_alignbuf,
                            sizeof(bsc->sc_alignbuf));
                }
                else
                        dma_cachectl(*bsc->sc_dmaaddr, bsc->sc_dmasize);
        }
#endif

        pa >>= 1;
        if (!bsc->sc_datain)
                pa |= 0x80000000;
        bsc->sc_dmabase[12] = (uint8_t)(pa);
        bsc->sc_dmabase[8] = (uint8_t)(pa >> 8);
        bsc->sc_dmabase[4] = (uint8_t)(pa >> 16);
        bsc->sc_dmabase[0] = (uint8_t)(pa >> 24);
        bsc->sc_active = 1;
        return 0;
}

void
bztzsc_dma_go(struct ncr53c9x_softc *sc)
{
}

void
bztzsc_dma_stop(struct ncr53c9x_softc *sc)
{
}

int
bztzsc_dma_isactive(struct ncr53c9x_softc *sc)
{
        struct bztzsc_softc *bsc = (struct bztzsc_softc *)sc;

        return bsc->sc_active;
}

#ifdef DEBUG
void
bztzsc_dump(void)
{
        int i;

        i = bztzsc_trace_ptr;
        printf("bztzsc_trace dump: ptr %x\n", bztzsc_trace_ptr);
        do {
                if (bztzsc_trace[i].hardbits == 0) {
                        i = (i + 1) & 127;
                        continue;
                }
                printf("%02x%02x%02x%02x(", bztzsc_trace[i].hardbits,
                    bztzsc_trace[i].status, bztzsc_trace[i].xx, bztzsc_trace[i].yy);
                if (bztzsc_trace[i].status & NCRSTAT_INT)
                        printf("NCRINT/");
                if (bztzsc_trace[i].status & NCRSTAT_TC)
                        printf("NCRTC/");
                switch(bztzsc_trace[i].status & NCRSTAT_PHASE) {
                case 0:
                        printf("dataout"); break;
                case 1:
                        printf("datain"); break;
                case 2:
                        printf("cmdout"); break;
                case 3:
                        printf("status"); break;
                case 6:
                        printf("msgout"); break;
                case 7:
                        printf("msgin"); break;
                default:
                        printf("phase%d?", bztzsc_trace[i].status & NCRSTAT_PHASE);
                }
                printf(") ");
                i = (i + 1) & 127;
        } while (i != bztzsc_trace_ptr);
        printf("\n");
}
#endif