NetBSD-5.0.2/sys/dev/tc/asc_tcds.c
/* $NetBSD: asc_tcds.c,v 1.24 2008/04/28 20:23:58 martin Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: asc_tcds.c,v 1.24 2008/04/28 20:23:58 martin Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/buf.h>
#include <uvm/uvm_extern.h>
#include <dev/scsipi/scsi_all.h>
#include <dev/scsipi/scsipi_all.h>
#include <dev/scsipi/scsiconf.h>
#include <dev/ic/ncr53c9xreg.h>
#include <dev/ic/ncr53c9xvar.h>
#include <sys/bus.h>
#include <dev/tc/tcvar.h>
#include <dev/tc/tcdsreg.h>
#include <dev/tc/tcdsvar.h>
struct asc_softc {
struct ncr53c9x_softc sc_ncr53c9x; /* glue to MI code */
bus_space_tag_t sc_bst; /* bus space tag */
bus_space_handle_t sc_scsi_bsh; /* ASC register handle */
bus_dma_tag_t sc_dmat; /* bus DMA tag */
bus_dmamap_t sc_dmamap; /* bus dmamap */
uint8_t **sc_dmaaddr;
size_t *sc_dmalen;
size_t sc_dmasize;
unsigned sc_flags;
#define ASC_ISPULLUP 0x01
#define ASC_DMAACTIVE 0x02
#define ASC_MAPLOADED 0x04
struct tcds_slotconfig *sc_tcds; /* DMA/slot info lives here */
};
static int asc_tcds_match(device_t, cfdata_t, void *);
static void asc_tcds_attach(device_t, device_t, void *);
CFATTACH_DECL_NEW(asc_tcds, sizeof(struct asc_softc),
asc_tcds_match, asc_tcds_attach, NULL, NULL);
/*
* Functions and the switch for the MI code.
*/
static uint8_t asc_read_reg(struct ncr53c9x_softc *, int);
static void asc_write_reg(struct ncr53c9x_softc *, int, uint8_t);
static int tcds_dma_isintr(struct ncr53c9x_softc *);
static void tcds_dma_reset(struct ncr53c9x_softc *);
static int tcds_dma_intr(struct ncr53c9x_softc *);
static int tcds_dma_setup(struct ncr53c9x_softc *, uint8_t **,
size_t *, int, size_t *);
static void tcds_dma_go(struct ncr53c9x_softc *);
static void tcds_dma_stop(struct ncr53c9x_softc *);
static int tcds_dma_isactive(struct ncr53c9x_softc *);
static void tcds_clear_latched_intr(struct ncr53c9x_softc *);
static struct ncr53c9x_glue asc_tcds_glue = {
asc_read_reg,
asc_write_reg,
tcds_dma_isintr,
tcds_dma_reset,
tcds_dma_intr,
tcds_dma_setup,
tcds_dma_go,
tcds_dma_stop,
tcds_dma_isactive,
tcds_clear_latched_intr,
};
static int
asc_tcds_match(device_t parent, cfdata_t cf, void *aux)
{
/* We always exist. */
return 1;
}
#define DMAMAX(a) (PAGE_SIZE - ((a) & (PAGE_SIZE - 1)))
/*
* Attach this instance, and then all the sub-devices
*/
static void
asc_tcds_attach(device_t parent, device_t self, void *aux)
{
struct asc_softc *asc = device_private(self);
struct ncr53c9x_softc *sc = &asc->sc_ncr53c9x;
struct tcdsdev_attach_args *tcdsdev = aux;
int error;
/*
* Set up glue for MI code early; we use some of it here.
*/
sc->sc_dev = self;
sc->sc_glue = &asc_tcds_glue;
asc->sc_bst = tcdsdev->tcdsda_bst;
asc->sc_scsi_bsh = tcdsdev->tcdsda_bsh;
asc->sc_tcds = tcdsdev->tcdsda_sc;
/*
* The TCDS ASIC cannot DMA across 8k boundaries, and this
* driver is written such that each DMA segment gets a new
* call to tcds_dma_setup(). Thus, the DMA map only needs
* to support 8k transfers.
*/
asc->sc_dmat = tcdsdev->tcdsda_dmat;
if ((error = bus_dmamap_create(asc->sc_dmat, PAGE_SIZE, 1, PAGE_SIZE,
PAGE_SIZE, BUS_DMA_NOWAIT, &asc->sc_dmamap)) < 0) {
aprint_error(": failed to create DMA map, error = %d\n", error);
return;
}
sc->sc_id = tcdsdev->tcdsda_id;
sc->sc_freq = tcdsdev->tcdsda_freq;
/* gimme MHz */
sc->sc_freq /= 1000000;
tcds_intr_establish(parent, tcdsdev->tcdsda_chip, ncr53c9x_intr, sc);
/*
* XXX More of this should be in ncr53c9x_attach(), but
* XXX should we really poke around the chip that much in
* XXX the MI code? Think about this more...
*/
/*
* Set up static configuration info.
*/
sc->sc_cfg1 = sc->sc_id | NCRCFG1_PARENB;
sc->sc_cfg2 = NCRCFG2_SCSI2;
sc->sc_cfg3 = NCRCFG3_CDB;
if (sc->sc_freq > 25)
sc->sc_cfg3 |= NCRF9XCFG3_FCLK;
sc->sc_rev = tcdsdev->tcdsda_variant;
if (tcdsdev->tcdsda_fast) {
sc->sc_features |= NCR_F_FASTSCSI;
sc->sc_cfg3_fscsi = NCRF9XCFG3_FSCSI;
}
/*
* XXX minsync and maxxfer _should_ be set up in MI code,
* XXX but it appears to have some dependency on what sort
* XXX of DMA we're hooked up to, etc.
*/
/*
* 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) * tcdsdev->tcdsda_period / 4;
sc->sc_maxxfer = 64 * 1024;
/* Do the common parts of attachment. */
sc->sc_adapter.adapt_minphys = minphys;
sc->sc_adapter.adapt_request = ncr53c9x_scsipi_request;
ncr53c9x_attach(sc);
}
static void
tcds_dma_reset(struct ncr53c9x_softc *sc)
{
struct asc_softc *asc = (struct asc_softc *)sc;
/* TCDS SCSI disable/reset/enable. */
tcds_scsi_reset(asc->sc_tcds); /* XXX */
if (asc->sc_flags & ASC_MAPLOADED)
bus_dmamap_unload(asc->sc_dmat, asc->sc_dmamap);
asc->sc_flags &= ~(ASC_DMAACTIVE|ASC_MAPLOADED);
}
/*
* start a DMA transfer or keep it going
*/
int
tcds_dma_setup(struct ncr53c9x_softc *sc, uint8_t **addr, size_t *len,
int ispullup, size_t *dmasize)
{
struct asc_softc *asc = (struct asc_softc *)sc;
struct tcds_slotconfig *tcds = asc->sc_tcds;
size_t size;
uint32_t dic;
NCR_DMA(("tcds_dma %d: start %d@%p,%s\n", tcds->sc_slot,
(int)*asc->sc_dmalen, *asc->sc_dmaaddr,
(ispullup) ? "IN" : "OUT"));
/*
* 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)*addr));
asc->sc_dmaaddr = addr;
asc->sc_dmalen = len;
asc->sc_flags = (ispullup) ? ASC_ISPULLUP : 0;
*dmasize = asc->sc_dmasize = size;
NCR_DMA(("dma_start: dmasize = %d\n", (int)size));
if (size == 0)
return 0;
if (bus_dmamap_load(asc->sc_dmat, asc->sc_dmamap, *addr, size,
NULL, BUS_DMA_NOWAIT | (ispullup ? BUS_DMA_READ : BUS_DMA_WRITE))) {
/*
* XXX Should return an error, here, but the upper-layer
* XXX doesn't check the return value!
*/
panic("%s: dmamap load failed", __func__);
}
/* synchronize dmamap contents with memory image */
bus_dmamap_sync(asc->sc_dmat, asc->sc_dmamap, 0, size,
(ispullup) ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE);
/* load address, set/clear unaligned transfer and read/write bits. */
bus_space_write_4(tcds->sc_bst, tcds->sc_bsh, tcds->sc_sda,
asc->sc_dmamap->dm_segs[0].ds_addr >> 2);
dic = bus_space_read_4(tcds->sc_bst, tcds->sc_bsh, tcds->sc_dic);
dic &= ~TCDS_DIC_ADDRMASK;
dic |= asc->sc_dmamap->dm_segs[0].ds_addr & TCDS_DIC_ADDRMASK;
if (ispullup)
dic |= TCDS_DIC_WRITE;
else
dic &= ~TCDS_DIC_WRITE;
bus_space_write_4(tcds->sc_bst, tcds->sc_bsh, tcds->sc_dic, dic);
asc->sc_flags |= ASC_MAPLOADED;
return 0;
}
static void
tcds_dma_go(struct ncr53c9x_softc *sc)
{
struct asc_softc *asc = (struct asc_softc *)sc;
/* mark unit as DMA-active */
asc->sc_flags |= ASC_DMAACTIVE;
/* start DMA */
tcds_dma_enable(asc->sc_tcds, 1);
}
static void
tcds_dma_stop(struct ncr53c9x_softc *sc)
{
#if 0
struct asc_softc *asc = (struct asc_softc *)sc;
#endif
/*
* XXX STOP DMA HERE!
*/
}
/*
* Pseudo (chained) interrupt from the asc driver to kick the
* current running DMA transfer. Called from ncr53c9x_intr()
* for now.
*
* return 1 if it was a DMA continue.
*/
static int
tcds_dma_intr(struct ncr53c9x_softc *sc)
{
struct asc_softc *asc = (struct asc_softc *)sc;
struct tcds_slotconfig *tcds = asc->sc_tcds;
int trans, resid;
uint32_t tcl, tcm;
uint32_t dud, dudmask, *addr;
bus_addr_t pa;
NCR_DMA(("tcds_dma %d: intr", tcds->sc_slot));
if (tcds_scsi_iserr(tcds))
return 0;
/* This is an "assertion" :) */
if ((asc->sc_flags & ASC_DMAACTIVE) == 0)
panic("%s: DMA wasn't active", __func__);
/* DMA has stopped */
tcds_dma_enable(tcds, 0);
asc->sc_flags &= ~ASC_DMAACTIVE;
if (asc->sc_dmasize == 0) {
/* A "Transfer Pad" operation completed */
tcl = NCR_READ_REG(sc, NCR_TCL);
tcm = NCR_READ_REG(sc, NCR_TCM);
NCR_DMA(("dma_intr: discarded %d bytes (tcl=%d, tcm=%d)\n",
tcl | (tcm << 8), tcl, tcm));
return 0;
}
resid = 0;
if ((asc->sc_flags & ASC_ISPULLUP) == 0 &&
(resid = (NCR_READ_REG(sc, NCR_FFLAG) & NCRFIFO_FF)) != 0) {
NCR_DMA(("dma_intr: empty esp FIFO of %d ", resid));
DELAY(1);
}
resid += (tcl = NCR_READ_REG(sc, NCR_TCL));
resid += (tcm = NCR_READ_REG(sc, NCR_TCM)) << 8;
trans = asc->sc_dmasize - resid;
if (trans < 0) { /* transferred < 0 ? */
printf("tcds_dma %d: xfer (%d) > req (%d)\n",
tcds->sc_slot, trans, (int)asc->sc_dmasize);
trans = asc->sc_dmasize;
}
NCR_DMA(("dma_intr: tcl=%d, tcm=%d; trans=%d, resid=%d\n",
tcl, tcm, trans, resid));
*asc->sc_dmalen -= trans;
*asc->sc_dmaaddr += trans;
bus_dmamap_sync(asc->sc_dmat, asc->sc_dmamap,
0, asc->sc_dmamap->dm_mapsize,
(sc->sc_flags & ASC_ISPULLUP) ?
BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
/*
* Clean up unaligned DMAs into main memory.
*/
if (asc->sc_flags & ASC_ISPULLUP) {
/* Handle unaligned starting address, length. */
dud = bus_space_read_4(tcds->sc_bst,
tcds->sc_bsh, tcds->sc_dud0);
if ((dud & TCDS_DUD0_VALIDBITS) != 0) {
addr = (uint32_t *)((paddr_t)*asc->sc_dmaaddr & ~0x3);
dudmask = 0;
if (dud & TCDS_DUD0_VALID00)
panic("%s: dud0 byte 0 valid", __func__);
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
NCR_DMA(("dud0 at %p dudmask 0x%x\n",
addr, dudmask));
*addr = (*addr & ~dudmask) | (dud & dudmask);
}
dud = bus_space_read_4(tcds->sc_bst,
tcds->sc_bsh, tcds->sc_dud1);
if ((dud & TCDS_DUD1_VALIDBITS) != 0) {
pa = bus_space_read_4(tcds->sc_bst, tcds->sc_bsh,
tcds->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("%s: dud1 byte 3 valid", __func__);
#endif
NCR_DMA(("dud1 at 0x%lx dudmask 0x%x\n",
pa, dudmask));
/* XXX Fix TC_PHYS_TO_UNCACHED() */
#if defined(__alpha__)
addr = (uint32_t *)ALPHA_PHYS_TO_K0SEG(pa);
#elif defined(__mips__)
addr = (uint32_t *)MIPS_PHYS_TO_KSEG1(pa);
#elif defined(__vax__)
addr = (uint32_t *)VAX_PHYS_TO_S0(pa);
#else
#error TURBOchannel only exists on DECs, folks...
#endif
*addr = (*addr & ~dudmask) | (dud & dudmask);
}
/* XXX deal with saved residual byte? */
}
bus_dmamap_unload(asc->sc_dmat, asc->sc_dmamap);
asc->sc_flags &= ~ASC_MAPLOADED;
return 0;
}
/*
* Glue functions.
*/
static uint8_t
asc_read_reg(struct ncr53c9x_softc *sc, int reg)
{
struct asc_softc *asc = (struct asc_softc *)sc;
uint32_t v;
v = bus_space_read_4(asc->sc_bst, asc->sc_scsi_bsh,
reg * sizeof(uint32_t));
return v & 0xff;
}
static void
asc_write_reg(struct ncr53c9x_softc *sc, int reg, u_char val)
{
struct asc_softc *asc = (struct asc_softc *)sc;
bus_space_write_4(asc->sc_bst, asc->sc_scsi_bsh,
reg * sizeof(uint32_t), val);
}
static int
tcds_dma_isintr(struct ncr53c9x_softc *sc)
{
struct asc_softc *asc = (struct asc_softc *)sc;
int x;
x = tcds_scsi_isintr(asc->sc_tcds, 1);
/* XXX */
return x;
}
static int
tcds_dma_isactive(struct ncr53c9x_softc *sc)
{
struct asc_softc *asc = (struct asc_softc *)sc;
return (asc->sc_flags & ASC_DMAACTIVE) != 0;
}
static void
tcds_clear_latched_intr(struct ncr53c9x_softc *sc)
{
struct asc_softc *asc = (struct asc_softc *)sc;
/* Clear the TCDS interrupt bit. */
(void)tcds_scsi_isintr(asc->sc_tcds, 1);
}