NetBSD-5.0.2/sys/arch/vax/vsa/asc_vsbus.c
/* $NetBSD: asc_vsbus.c,v 1.40 2008/04/28 20:23:39 martin Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum.
*
* 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.
*/
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: asc_vsbus.c,v 1.40 2008/04/28 20:23:39 martin Exp $");
#include "locators.h"
#include "opt_cputype.h"
#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/user.h>
#include <sys/reboot.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/bus.h>
#include <machine/vmparam.h>
#include <dev/ic/ncr53c9xreg.h>
#include <dev/ic/ncr53c9xvar.h>
#include <machine/cpu.h>
#include <machine/sid.h>
#include <machine/scb.h>
#include <machine/vsbus.h>
#include <machine/clock.h> /* for SCSI ctlr ID# XXX */
struct asc_vsbus_softc {
struct ncr53c9x_softc sc_ncr53c9x; /* Must be first */
struct evcnt sc_intrcnt; /* count interrupts */
bus_space_tag_t sc_bst; /* bus space tag */
bus_space_handle_t sc_bsh; /* bus space handle */
bus_space_handle_t sc_dirh; /* scsi direction handle */
bus_space_handle_t sc_adrh; /* scsi address handle */
bus_space_handle_t sc_ncrh; /* ncr bus space handle */
bus_dma_tag_t sc_dmat; /* bus DMA tag */
bus_dmamap_t sc_dmamap;
uint8_t **sc_dmaaddr;
size_t *sc_dmalen;
size_t sc_dmasize;
unsigned int sc_flags;
#define ASC_FROMMEMORY 0x0001 /* Must be 1 */
#define ASC_DMAACTIVE 0x0002
#define ASC_MAPLOADED 0x0004
unsigned long sc_xfers;
};
#define ASC_REG_KA46_ADR 0x0000
#define ASC_REG_KA46_DIR 0x000C
#define ASC_REG_KA49_ADR 0x0000
#define ASC_REG_KA49_DIR 0x0004
#define ASC_REG_NCR 0x0080
#define ASC_REG_END 0x00B0
#define ASC_MAXXFERSIZE 65536
#define ASC_FREQUENCY 25000000
static int asc_vsbus_match(device_t, cfdata_t, void *);
static void asc_vsbus_attach(device_t, device_t, void *);
CFATTACH_DECL_NEW(asc_vsbus, sizeof(struct asc_vsbus_softc),
asc_vsbus_match, asc_vsbus_attach, NULL, NULL);
/*
* Functions and the switch for the MI code
*/
static uint8_t asc_vsbus_read_reg(struct ncr53c9x_softc *, int);
static void asc_vsbus_write_reg(struct ncr53c9x_softc *, int, uint8_t);
static int asc_vsbus_dma_isintr(struct ncr53c9x_softc *);
static void asc_vsbus_dma_reset(struct ncr53c9x_softc *);
static int asc_vsbus_dma_intr(struct ncr53c9x_softc *);
static int asc_vsbus_dma_setup(struct ncr53c9x_softc *, uint8_t **,
size_t *, int, size_t *);
static void asc_vsbus_dma_go(struct ncr53c9x_softc *);
static void asc_vsbus_dma_stop(struct ncr53c9x_softc *);
static int asc_vsbus_dma_isactive(struct ncr53c9x_softc *);
static const struct ncr53c9x_glue asc_vsbus_glue = {
.gl_read_reg = asc_vsbus_read_reg,
.gl_write_reg = asc_vsbus_write_reg,
.gl_dma_isintr = asc_vsbus_dma_isintr,
.gl_dma_reset = asc_vsbus_dma_reset,
.gl_dma_intr = asc_vsbus_dma_intr,
.gl_dma_setup = asc_vsbus_dma_setup,
.gl_dma_go = asc_vsbus_dma_go,
.gl_dma_stop = asc_vsbus_dma_stop,
.gl_dma_isactive = asc_vsbus_dma_isactive,
};
static uint8_t asc_attached; /* can't have more than one asc */
static int
asc_vsbus_match(device_t parent, cfdata_t cf, void *aux)
{
struct vsbus_attach_args * const va = aux;
volatile uint8_t *ncr_regs;
int dummy;
if (asc_attached)
return 0;
if (vax_boardtype == VAX_BTYP_46 || vax_boardtype == VAX_BTYP_48) {
if (cf->cf_loc[VSBUSCF_CSR] != 0x200c0080)
return 0;
} else if (vax_boardtype == VAX_BTYP_49 ||
vax_boardtype == VAX_BTYP_53) {
if (cf->cf_loc[VSBUSCF_CSR] != 0x26000080)
return 0;
} else {
return 0;
}
ncr_regs = (volatile uint8_t *) va->va_addr;
/* *** need to generate an interrupt here
* From trial and error, I've determined that an INT is generated
* only when the following sequence of events occurs:
* 1) The interrupt status register (0x05) must be read.
* 2) SCSI bus reset interrupt must be enabled
* 3) SCSI bus reset command must be sent
* 4) NOP command must be sent
*/
dummy = ncr_regs[NCR_INTR << 2] & 0xFF;
ncr_regs[NCR_CFG1 << 2] = 0x06; /* we're ID 6, turn on INT for SCSI reset */
ncr_regs[NCR_CMD << 2] = NCRCMD_RSTSCSI; /* send the reset */
ncr_regs[NCR_CMD << 2] = NCRCMD_NOP; /* send a NOP */
DELAY(10000);
dummy = ncr_regs[NCR_INTR << 2] & 0xFF;
return (dummy & NCRINTR_SBR) != 0;
}
/*
* Attach this instance, and then all the sub-devices
*/
static void
asc_vsbus_attach(device_t parent, device_t self, void *aux)
{
struct vsbus_attach_args * const va = aux;
struct asc_vsbus_softc * const asc = device_private(self);
struct ncr53c9x_softc * const sc = &asc->sc_ncr53c9x;
int error;
asc_attached = 1;
/*
* Set up glue for MI code early; we use some of it here.
*/
sc->sc_dev = self;
sc->sc_glue = &asc_vsbus_glue;
asc->sc_bst = va->va_memt;
asc->sc_dmat = va->va_dmat;
error = bus_space_map(asc->sc_bst, va->va_paddr - ASC_REG_NCR,
ASC_REG_END, 0, &asc->sc_bsh);
if (error) {
aprint_error(": failed to map registers: error=%d\n", error);
return;
}
error = bus_space_subregion(asc->sc_bst, asc->sc_bsh, ASC_REG_NCR,
ASC_REG_END - ASC_REG_NCR, &asc->sc_ncrh);
if (error) {
aprint_error(": failed to map ncr registers: error=%d\n",
error);
return;
}
if (vax_boardtype == VAX_BTYP_46 || vax_boardtype == VAX_BTYP_48) {
error = bus_space_subregion(asc->sc_bst, asc->sc_bsh,
ASC_REG_KA46_ADR, sizeof(uint32_t), &asc->sc_adrh);
if (error) {
aprint_error(": failed to map adr register: error=%d\n",
error);
return;
}
error = bus_space_subregion(asc->sc_bst, asc->sc_bsh,
ASC_REG_KA46_DIR, sizeof(uint32_t), &asc->sc_dirh);
if (error) {
aprint_error(": failed to map dir register: error=%d\n",
error);
return;
}
} else {
/* This is a gross and disgusting kludge but it'll
* save a bunch of ugly code. Unlike the VS4000/60,
* the SCSI Address and direction registers are not
* near the SCSI NCR registers and are inside the
* block of general VAXstation registers. So we grab
* them from there and knowing the internals of the
* bus_space implementation, we cast to bus_space_handles.
*/
struct vsbus_softc *vsc = device_private(parent);
asc->sc_adrh =
(bus_space_handle_t)(vsc->sc_vsregs + ASC_REG_KA49_ADR);
asc->sc_dirh =
(bus_space_handle_t)(vsc->sc_vsregs + ASC_REG_KA49_DIR);
#if 0
printf("\n%s: adrh=0x%08lx dirh=0x%08lx", device_xname(self),
asc->sc_adrh, asc->sc_dirh);
ncr53c9x_debug = NCR_SHOWDMA | NCR_SHOWINTS | NCR_SHOWCMDS |
NCR_SHOWPHASE | NCR_SHOWSTART | NCR_SHOWMSGS;
#endif
}
error = bus_dmamap_create(asc->sc_dmat, ASC_MAXXFERSIZE, 1,
ASC_MAXXFERSIZE, 0, BUS_DMA_NOWAIT, &asc->sc_dmamap);
#if defined(VAX46) || defined(VAX48) || defined(VAX49) || defined(VAXANY)
if(vax_boardtype != VAX_BTYP_53)
/* SCSI ID is store in the clock NVRAM at magic address 0xbc */
sc->sc_id = (clk_page[0xbc / 2] >> clk_tweak) & 7;
else
#endif
sc->sc_id = 6; /* XXX need to get this from VMB */
sc->sc_freq = ASC_FREQUENCY;
/* gimme MHz */
sc->sc_freq /= 1000000;
scb_vecalloc(va->va_cvec, (void (*)(void *))ncr53c9x_intr,
&asc->sc_ncr53c9x, SCB_ISTACK, &asc->sc_intrcnt);
evcnt_attach_dynamic(&asc->sc_intrcnt, EVCNT_TYPE_INTR, NULL,
device_xname(self), "intr");
/*
* 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 = 0;
sc->sc_rev = NCR_VARIANT_NCR53C94;
/*
* 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);
sc->sc_maxxfer = 64 * 1024;
aprint_normal("\n%s", device_xname(self)); /* Pretty print */
/* Do the common parts of attachment. */
sc->sc_adapter.adapt_minphys = minphys;
sc->sc_adapter.adapt_request = ncr53c9x_scsipi_request;
ncr53c9x_attach(sc);
}
/*
* Glue functions.
*/
static uint8_t
asc_vsbus_read_reg(struct ncr53c9x_softc *sc, int reg)
{
struct asc_vsbus_softc * const asc = (struct asc_vsbus_softc *)sc;
return bus_space_read_1(asc->sc_bst, asc->sc_ncrh,
reg * sizeof(uint32_t));
}
static void
asc_vsbus_write_reg(struct ncr53c9x_softc *sc, int reg, uint8_t val)
{
struct asc_vsbus_softc * const asc = (struct asc_vsbus_softc *)sc;
bus_space_write_1(asc->sc_bst, asc->sc_ncrh,
reg * sizeof(uint32_t), val);
}
static int
asc_vsbus_dma_isintr(struct ncr53c9x_softc *sc)
{
struct asc_vsbus_softc * const asc = (struct asc_vsbus_softc *)sc;
return bus_space_read_1(asc->sc_bst, asc->sc_ncrh,
NCR_STAT * sizeof(uint32_t)) & NCRSTAT_INT;
}
static void
asc_vsbus_dma_reset(struct ncr53c9x_softc *sc)
{
struct asc_vsbus_softc * const asc = (struct asc_vsbus_softc *)sc;
if (asc->sc_flags & ASC_MAPLOADED)
bus_dmamap_unload(asc->sc_dmat, asc->sc_dmamap);
asc->sc_flags &= ~(ASC_DMAACTIVE|ASC_MAPLOADED);
}
static int
asc_vsbus_dma_intr(struct ncr53c9x_softc *sc)
{
struct asc_vsbus_softc * const asc = (struct asc_vsbus_softc *)sc;
u_int tcl, tcm;
int trans, resid;
if ((asc->sc_flags & ASC_DMAACTIVE) == 0)
panic("%s: DMA wasn't active", __func__);
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(("asc_vsbus_intr: discarded %d bytes (tcl=%d, tcm=%d)\n",
tcl | (tcm << 8), tcl, tcm));
return 0;
}
resid = 0;
if ((resid = (NCR_READ_REG(sc, NCR_FFLAG) & NCRFIFO_FF)) != 0) {
NCR_DMA(("asc_vsbus_intr: empty FIFO of %d ", resid));
DELAY(1);
}
if (asc->sc_flags & ASC_MAPLOADED) {
bus_dmamap_sync(asc->sc_dmat, asc->sc_dmamap,
0, asc->sc_dmasize,
asc->sc_flags & ASC_FROMMEMORY
? BUS_DMASYNC_POSTWRITE
: BUS_DMASYNC_POSTREAD);
bus_dmamap_unload(asc->sc_dmat, asc->sc_dmamap);
}
asc->sc_flags &= ~ASC_MAPLOADED;
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("asc_vsbus_intr: xfer (%d) > req (%lu)\n",
trans, (u_long) asc->sc_dmasize);
trans = asc->sc_dmasize;
}
NCR_DMA(("asc_vsbus_intr: tcl=%d, tcm=%d; trans=%d, resid=%d\n",
tcl, tcm, trans, resid));
*asc->sc_dmalen -= trans;
*asc->sc_dmaaddr += trans;
asc->sc_xfers++;
return 0;
}
static int
asc_vsbus_dma_setup(struct ncr53c9x_softc *sc, uint8_t **addr, size_t *len,
int datain, size_t *dmasize)
{
struct asc_vsbus_softc * const asc = (struct asc_vsbus_softc *)sc;
asc->sc_dmaaddr = addr;
asc->sc_dmalen = len;
if (datain) {
asc->sc_flags &= ~ASC_FROMMEMORY;
} else {
asc->sc_flags |= ASC_FROMMEMORY;
}
if ((vaddr_t)*asc->sc_dmaaddr < VM_MIN_KERNEL_ADDRESS)
panic("%s: DMA address (%p) outside of kernel",
__func__, *asc->sc_dmaaddr);
NCR_DMA(("%s: start %d@%p,%d\n", device_xname(&sc->sc_dev),
(int)*asc->sc_dmalen, *asc->sc_dmaaddr,
(asc->sc_flags & ASC_FROMMEMORY)));
*dmasize = asc->sc_dmasize = min(*dmasize, ASC_MAXXFERSIZE);
if (asc->sc_dmasize) {
if (bus_dmamap_load(asc->sc_dmat, asc->sc_dmamap,
*asc->sc_dmaaddr, asc->sc_dmasize,
NULL /* kernel address */,
BUS_DMA_NOWAIT|VAX_BUS_DMA_SPILLPAGE))
panic("%s: cannot load DMA map",
device_xname(sc->sc_dev));
bus_dmamap_sync(asc->sc_dmat, asc->sc_dmamap,
0, asc->sc_dmasize,
asc->sc_flags & ASC_FROMMEMORY
? BUS_DMASYNC_PREWRITE
: BUS_DMASYNC_PREREAD);
bus_space_write_4(asc->sc_bst, asc->sc_adrh, 0,
asc->sc_dmamap->dm_segs[0].ds_addr);
bus_space_write_4(asc->sc_bst, asc->sc_dirh, 0,
asc->sc_flags & ASC_FROMMEMORY);
NCR_DMA(("%s: dma-load %lu@0x%08lx\n",
device_xname(sc->sc_dev),
asc->sc_dmamap->dm_segs[0].ds_len,
asc->sc_dmamap->dm_segs[0].ds_addr));
asc->sc_flags |= ASC_MAPLOADED;
}
return 0;
}
static void
asc_vsbus_dma_go(struct ncr53c9x_softc *sc)
{
struct asc_vsbus_softc * const asc = (struct asc_vsbus_softc *)sc;
asc->sc_flags |= ASC_DMAACTIVE;
}
static void
asc_vsbus_dma_stop(struct ncr53c9x_softc *sc)
{
struct asc_vsbus_softc * const asc = (struct asc_vsbus_softc *)sc;
if (asc->sc_flags & ASC_MAPLOADED) {
bus_dmamap_sync(asc->sc_dmat, asc->sc_dmamap,
0, asc->sc_dmasize,
asc->sc_flags & ASC_FROMMEMORY
? BUS_DMASYNC_POSTWRITE
: BUS_DMASYNC_POSTREAD);
bus_dmamap_unload(asc->sc_dmat, asc->sc_dmamap);
}
asc->sc_flags &= ~(ASC_DMAACTIVE|ASC_MAPLOADED);
}
static int
asc_vsbus_dma_isactive(struct ncr53c9x_softc *sc)
{
struct asc_vsbus_softc * const asc = (struct asc_vsbus_softc *)sc;
return (asc->sc_flags & ASC_DMAACTIVE) != 0;
}