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/* $OpenBSD: tcds_dma.c,v 1.5 1997/01/24 19:58:23 niklas Exp $ */
/* $NetBSD: tcds_dma.c,v 1.15 1996/12/04 22:35:08 mycroft Exp $ */
/*
* Copyright (c) 1994 Peter Galbavy. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Peter Galbavy.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#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/malloc.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <scsi/scsi_all.h>
#include <scsi/scsiconf.h>
#include <dev/tc/tcvar.h>
#include <alpha/tc/tcdsreg.h>
#include <alpha/tc/tcdsvar.h>
#include <alpha/tc/espreg.h>
#include <alpha/tc/espvar.h>
void
tcds_dma_reset(sc)
struct tcds_slotconfig *sc;
{
/* TCDS SCSI disable/reset/enable. */
tcds_scsi_reset(sc); /* XXX */
sc->sc_active = 0; /* and of course we aren't */
}
int
tcds_dma_isintr(sc)
struct tcds_slotconfig *sc;
{
int x;
x = tcds_scsi_isintr(sc, 1);
/* XXX */
return x;
}
/*
* Pseudo (chained) interrupt from the esp driver to kick the
* current running DMA transfer. I am replying on espintr() to
* pickup and clean errors for now
*
* return 1 if it was a DMA continue.
*/
int
tcds_dma_intr(sc)
struct tcds_slotconfig *sc;
{
u_int32_t dud;
int trans = 0, resid = 0;
u_int32_t *addr, dudmask;
u_char tcl, tcm, tch;
ESP_DMA(("tcds_dma %d: intr", sc->sc_slot));
if (tcds_scsi_iserr(sc))
return (0);
/* This is an "assertion" :) */
if (sc->sc_active == 0)
panic("dmaintr: DMA wasn't active");
/* DMA has stopped */
tcds_dma_enable(sc, 0);
sc->sc_active = 0;
if (sc->sc_dmasize == 0) {
/* A "Transfer Pad" operation completed */
tcl = ESP_READ_REG(sc->sc_esp, ESP_TCL);
tcm = ESP_READ_REG(sc->sc_esp, ESP_TCM);
ESP_DMA(("dmaintr: discarded %d bytes (tcl=%d, tcm=%d)\n",
tcl | (tcm << 8), tcl, tcm));
return 0;
}
if (!sc->sc_iswrite &&
(resid = (ESP_READ_REG(sc->sc_esp, ESP_FFLAG) & ESPFIFO_FF)) != 0) {
ESPCMD(sc->sc_esp, ESPCMD_FLUSH);
DELAY(1);
}
resid += (tcl = ESP_READ_REG(sc->sc_esp, ESP_TCL));
resid += (tcm = ESP_READ_REG(sc->sc_esp, ESP_TCM)) << 8;
if (sc->sc_esp->sc_rev == ESP200)
resid += (tch = ESP_READ_REG(sc->sc_esp, ESP_TCH)) << 16;
else
tch = 0;
if (resid == 0 && (sc->sc_esp->sc_rev <= ESP100A) &&
(sc->sc_esp->sc_espstat & ESPSTAT_TC) == 0)
resid = 65536;
trans = sc->sc_dmasize - resid;
if (trans < 0) { /* transferred < 0 ? */
printf("tcds_dma %d: xfer (%d) > req (%ld)\n",
sc->sc_slot, trans, sc->sc_dmasize);
trans = sc->sc_dmasize;
}
ESP_DMA(("dmaintr: tcl=%d, tcm=%d, tch=%d; trans=%d, resid=%d\n",
tcl, tcm, tch, trans, resid));
/*
* Clean up unaligned DMAs into main memory.
*/
if (sc->sc_iswrite) {
/* Handle unaligned starting address, length. */
dud = *sc->sc_dud0;
if ((dud & TCDS_DUD0_VALIDBITS) != 0) {
addr = (u_int32_t *)
((vm_offset_t)sc->sc_dmaaddr & ~0x3);
dudmask = 0;
if (dud & TCDS_DUD0_VALID00)
panic("tcds_dma: dud0 byte 0 valid");
if (dud & TCDS_DUD0_VALID01)
dudmask |= TCDS_DUD_BYTE01;
if (dud & TCDS_DUD0_VALID10)
dudmask |= TCDS_DUD_BYTE10;
#ifdef DIAGNOSTIC
if (dud & TCDS_DUD0_VALID11)
dudmask |= TCDS_DUD_BYTE11;
#endif
ESP_DMA(("dud0 at 0x%p dudmask 0x%x\n",
addr, dudmask));
addr = (u_int32_t *)ALPHA_PHYS_TO_K0SEG((vm_offset_t)addr);
*addr = (*addr & ~dudmask) | (dud & dudmask);
}
dud = *sc->sc_dud1;
if ((dud & TCDS_DUD1_VALIDBITS) != 0) {
addr = (u_int32_t *)
((vm_offset_t)*sc->sc_sda << 2);
dudmask = 0;
if (dud & TCDS_DUD1_VALID00)
dudmask |= TCDS_DUD_BYTE00;
if (dud & TCDS_DUD1_VALID01)
dudmask |= TCDS_DUD_BYTE01;
if (dud & TCDS_DUD1_VALID10)
dudmask |= TCDS_DUD_BYTE10;
#ifdef DIAGNOSTIC
if (dud & TCDS_DUD1_VALID11)
panic("tcds_dma: dud1 byte 3 valid");
#endif
ESP_DMA(("dud1 at 0x%p dudmask 0x%x\n",
addr, dudmask));
addr = (u_int32_t *)ALPHA_PHYS_TO_K0SEG((vm_offset_t)addr);
*addr = (*addr & ~dudmask) | (dud & dudmask);
}
/* XXX deal with saved residual byte? */
}
*sc->sc_dmalen -= trans;
*sc->sc_dmaaddr += trans;
#if 0 /* this is not normal operation just yet */
if (*sc->sc_dmalen == 0 ||
sc->sc_esp->sc_phase != sc->sc_esp->sc_prevphase)
return 0;
/* and again */
dma_start(sc, sc->sc_dmaaddr, sc->sc_dmalen, sc->sc_iswrite);
return 1;
#endif
return 0;
}
#define DMAMAX(a) (0x02000 - ((a) & 0x1fff))
/*
* start a dma transfer or keep it going
*/
int
tcds_dma_setup(sc, addr, len, datain, dmasize)
struct tcds_slotconfig *sc;
caddr_t *addr;
size_t *len, *dmasize;
int datain; /* DMA into main memory */
{
u_int32_t dic;
size_t size;
sc->sc_dmaaddr = addr;
sc->sc_dmalen = len;
sc->sc_iswrite = datain;
ESP_DMA(("tcds_dma %d: start %ld@%p,%d\n", sc->sc_slot, *sc->sc_dmalen, *sc->sc_dmaaddr, sc->sc_iswrite));
/*
* the rules say we cannot transfer more than the limit
* of this DMA chip (64k) and we cannot cross a 8k boundary.
*/
size = min(*dmasize, DMAMAX((size_t) *sc->sc_dmaaddr));
*dmasize = sc->sc_dmasize = size;
ESP_DMA(("dma_start: dmasize = %ld\n", sc->sc_dmasize));
/* Load address, set/clear unaligned transfer and read/write bits. */
/* XXX PICK AN ADDRESS TYPE, AND STICK TO IT! */
if ((u_long)*addr > VM_MIN_KERNEL_ADDRESS) {
*sc->sc_sda = vatopa((u_long)*addr) >> 2;
} else {
*sc->sc_sda = ALPHA_K0SEG_TO_PHYS((u_long)*addr) >> 2;
}
alpha_mb();
dic = *sc->sc_dic;
dic &= ~TCDS_DIC_ADDRMASK;
dic |= (vm_offset_t)*addr & TCDS_DIC_ADDRMASK;
if (datain)
dic |= TCDS_DIC_WRITE;
else
dic &= ~TCDS_DIC_WRITE;
*sc->sc_dic = dic;
alpha_mb();
return (0);
}
void
tcds_dma_go(sc)
struct tcds_slotconfig *sc;
{
/* mark unit as DMA-active */
sc->sc_active = 1;
/* Start DMA */
tcds_dma_enable(sc, 1);
}
int
tcds_dma_isactive(sc)
struct tcds_slotconfig *sc;
{
return (sc->sc_active);
}
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