/*      $NetBSD: cbsc.c,v 1.35 2019/01/08 19:41:09 jdolecek Exp $ */

/*
 * Copyright (c) 1997 Michael L. Hitch
 * 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.
 *
 */

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

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: cbsc.c,v 1.35 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/cbscvar.h>
#include <amiga/dev/zbusvar.h>

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

int     cbscmatch(device_t, cfdata_t, void *);
void    cbscattach(device_t, device_t, void *);

/* Linkup to the rest of the kernel */
CFATTACH_DECL_NEW(cbsc, sizeof(struct cbsc_softc),
    cbscmatch, cbscattach, NULL, NULL);

/*
 * Functions and the switch for the MI code.
 */
uint8_t cbsc_read_reg(struct ncr53c9x_softc *, int);
void    cbsc_write_reg(struct ncr53c9x_softc *, int, uint8_t);
int     cbsc_dma_isintr(struct ncr53c9x_softc *);
void    cbsc_dma_reset(struct ncr53c9x_softc *);
int     cbsc_dma_intr(struct ncr53c9x_softc *);
int     cbsc_dma_setup(struct ncr53c9x_softc *, uint8_t **,
            size_t *, int, size_t *);
void    cbsc_dma_go(struct ncr53c9x_softc *);
void    cbsc_dma_stop(struct ncr53c9x_softc *);
int     cbsc_dma_isactive(struct ncr53c9x_softc *);

struct ncr53c9x_glue cbsc_glue = {
        cbsc_read_reg,
        cbsc_write_reg,
        cbsc_dma_isintr,
        cbsc_dma_reset,
        cbsc_dma_intr,
        cbsc_dma_setup,
        cbsc_dma_go,
        cbsc_dma_stop,
        cbsc_dma_isactive,
        NULL,
};

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

u_long cbsc_cnt_pio = 0;        /* number of PIO transfers */
u_long cbsc_cnt_dma = 0;        /* number of DMA transfers */
u_long cbsc_cnt_dma2 = 0;       /* number of DMA transfers broken up */
u_long cbsc_cnt_dma3 = 0;       /* number of pages combined */

#ifdef DEBUG
struct {
        uint8_t hardbits;
        uint8_t status;
        uint8_t xx;
        uint8_t yy;
} cbsc_trace[128];
int cbsc_trace_ptr = 0;
int cbsc_trace_enable = 1;
void cbsc_dump(void);
#endif

/*
 * if we are a Phase5 CyberSCSI [mark I?]
 */
int
cbscmatch(device_t parent, cfdata_t cf, void *aux)
{
        struct zbus_args *zap;
        volatile uint8_t *regs;

        zap = aux;
        if (zap->manid != 0x2140)
                return 0;               /* It's not Phase5 */
        if (zap->prodid != 12 && zap->prodid != 11)
                return 0;               /* Not CyberStorm MKI SCSI */
        if (zap->prodid == 11 && iszthreepa(zap->pa))
                return 0;               /* Fastlane Z3! */
        regs = &((volatile uint8_t *)zap->va)[0xf400];
        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
cbscattach(device_t parent, device_t self, void *aux)
{
        struct cbsc_softc *csc = device_private(self);
        struct ncr53c9x_softc *sc = &csc->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 = &cbsc_glue;

        /*
         * Save the regs
         */
        zap = aux;
        csc->sc_reg = &((volatile uint8_t *)zap->va)[0xf400];
        csc->sc_dmabase = &csc->sc_reg[0x400];

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

        aprint_normal(": address %p", csc->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;

        /*
         * Configure interrupts.
         */
        csc->sc_isr.isr_intr = ncr53c9x_intr;
        csc->sc_isr.isr_arg  = sc;
        csc->sc_isr.isr_ipl  = 2;
        add_isr(&csc->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
cbsc_read_reg(struct ncr53c9x_softc *sc, int reg)
{
        struct cbsc_softc *csc = (struct cbsc_softc *)sc;

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

void
cbsc_write_reg(struct ncr53c9x_softc *sc, int reg, uint8_t val)
{
        struct cbsc_softc *csc = (struct cbsc_softc *)sc;
        uint8_t v = val;

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

int
cbsc_dma_isintr(struct ncr53c9x_softc *sc)
{
        struct cbsc_softc *csc = (struct cbsc_softc *)sc;

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

        if (sc->sc_state == NCR_CONNECTED)
                csc->sc_portbits |= CBSC_PB_LED;
        else
                csc->sc_portbits &= ~CBSC_PB_LED;
        csc->sc_reg[0x802] = csc->sc_portbits;

        if ((csc->sc_reg[0x802] & CBSC_HB_CREQ) == 0)
                return 0;
#ifdef DEBUG
if (/*sc->sc_nexus && sc->sc_nexus->xs->xs_control & XS_CTL_POLL &&*/ cbsc_trace_enable) {
  cbsc_trace[cbsc_trace_ptr].status = csc->sc_reg[NCR_STAT * 4];
  cbsc_trace[cbsc_trace_ptr].xx = csc->sc_reg[NCR_CMD * 4];
  cbsc_trace[cbsc_trace_ptr].yy = csc->sc_active;
  cbsc_trace_ptr = (cbsc_trace_ptr + 1) & 127;
}
#endif
        return 1;
}

void
cbsc_dma_reset(struct ncr53c9x_softc *sc)
{
        struct cbsc_softc *csc = (struct cbsc_softc *)sc;

        csc->sc_active = 0;
}

int
cbsc_dma_intr(struct ncr53c9x_softc *sc)
{
        register struct cbsc_softc *csc = (struct cbsc_softc *)sc;
        register int    cnt;

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

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

int
cbsc_dma_setup(struct ncr53c9x_softc *sc, uint8_t **addr, size_t *len,
               int datain, size_t *dmasize)
{
        struct cbsc_softc *csc = (struct cbsc_softc *)sc;
        paddr_t pa;
        uint8_t *ptr;
        size_t xfer;

        csc->sc_dmaaddr = addr;
        csc->sc_pdmalen = len;
        csc->sc_datain = datain;
        csc->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 && cbsc_max_dma != 0 &&
            csc->sc_dmasize > cbsc_max_dma)
                csc->sc_dmasize = cbsc_max_dma;
        ptr = *addr;                    /* Kernel virtual address */
        pa = kvtop(ptr);                /* Physical address of DMA */
        xfer = uimin(csc->sc_dmasize, PAGE_SIZE - (pa & (PAGE_SIZE - 1)));
        csc->sc_xfr_align = 0;
        /*
         * If output and unaligned, stuff odd byte into FIFO
         */
        if (datain == 0 && (int)ptr & 1) {
                NCR_DMA(("cbsc_dma_setup: align byte written to fifo\n"));
                pa++;
                xfer--;                 /* XXXX CHECK THIS !!!! XXXX */
                csc->sc_reg[NCR_FIFO * 4] = *ptr++;
        }
        /*
         * If unaligned address, read unaligned bytes into alignment buffer
         */
        else if ((int)ptr & 1) {
                pa = kvtop((void *)&csc->sc_alignbuf);
                xfer = csc->sc_dmasize = uimin(xfer, sizeof(csc->sc_alignbuf));
                NCR_DMA(("cbsc_dma_setup: align read by %d bytes\n", xfer));
                csc->sc_xfr_align = 1;
        }
++cbsc_cnt_dma;         /* number of DMA operations */

        while (xfer < csc->sc_dmasize) {
                if ((pa + xfer) != kvtop(*addr + xfer))
                        break;
                if ((csc->sc_dmasize - xfer) < PAGE_SIZE)
                        xfer = csc->sc_dmasize;
                else
                        xfer += PAGE_SIZE;
++cbsc_cnt_dma3;
        }
if (xfer != *len)
  ++cbsc_cnt_dma2;

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

        if (csc->sc_datain)
                pa &= ~1;
        else
                pa |= 1;
        csc->sc_dmabase[0] = (uint8_t)(pa >> 24);
        csc->sc_dmabase[2] = (uint8_t)(pa >> 16);
        csc->sc_dmabase[4] = (uint8_t)(pa >> 8);
        csc->sc_dmabase[6] = (uint8_t)(pa);
        if (csc->sc_datain)
                csc->sc_portbits &= ~CBSC_PB_WRITE;
        else
                csc->sc_portbits |= CBSC_PB_WRITE;
        csc->sc_reg[0x802] = csc->sc_portbits;
        csc->sc_active = 1;
        return 0;
}

void
cbsc_dma_go(struct ncr53c9x_softc *sc)
{
}

void
cbsc_dma_stop(struct ncr53c9x_softc *sc)
{
}

int
cbsc_dma_isactive(struct ncr53c9x_softc *sc)
{
        struct cbsc_softc *csc = (struct cbsc_softc *)sc;

        return csc->sc_active;
}

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

        i = cbsc_trace_ptr;
        printf("cbsc_trace dump: ptr %x\n", cbsc_trace_ptr);
        do {
                if (cbsc_trace[i].hardbits == 0) {
                        i = (i + 1) & 127;
                        continue;
                }
                printf("%02x%02x%02x%02x(", cbsc_trace[i].hardbits,
                    cbsc_trace[i].status, cbsc_trace[i].xx, cbsc_trace[i].yy);
                if (cbsc_trace[i].status & NCRSTAT_INT)
                        printf("NCRINT/");
                if (cbsc_trace[i].status & NCRSTAT_TC)
                        printf("NCRTC/");
                switch(cbsc_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?", cbsc_trace[i].status & NCRSTAT_PHASE);
                }
                printf(") ");
                i = (i + 1) & 127;
        } while (i != cbsc_trace_ptr);
        printf("\n");
}
#endif