Add a bus space implementation for the Gbus, the general 8-bit bus present
on Laser / TurboLaser CPU modules.
This commit is contained in:
thorpej
parent
c88858f459
commit
8eb9eddb64
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@ -1,4 +1,4 @@
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# $NetBSD: files.alpha,v 1.196 2024/03/02 20:15:33 thorpej Exp $
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# $NetBSD: files.alpha,v 1.197 2024/03/06 05:33:09 thorpej Exp $
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#
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# alpha-specific configuration info
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@ -104,6 +104,7 @@ file arch/alpha/tlsb/tlsbmem.c tlsbmem
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device gbus { offset = -1 }
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attach gbus at tlsb
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file arch/alpha/gbus/gbus.c gbus
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file arch/alpha/gbus/gbus_io.c gbus
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#
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# MCBUS support
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@ -1,4 +1,4 @@
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/* $NetBSD: gbus.c,v 1.1 2024/03/02 19:57:57 thorpej Exp $ */
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/* $NetBSD: gbus.c,v 1.2 2024/03/06 05:33:09 thorpej Exp $ */
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/*
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* Copyright (c) 1997 by Matthew Jacob
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@ -37,7 +37,7 @@
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#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
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__KERNEL_RCSID(0, "$NetBSD: gbus.c,v 1.1 2024/03/02 19:57:57 thorpej Exp $");
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__KERNEL_RCSID(0, "$NetBSD: gbus.c,v 1.2 2024/03/06 05:33:09 thorpej Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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@ -70,10 +70,10 @@ CFATTACH_DECL_NEW(gbus, sizeof(struct gbus_softc),
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static int gbusprint(void *, const char *);
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static const struct gbus_attach_args gbus_children[] = {
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{ "zsc", GBUS_DUART0_OFFSET },
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{ "zsc", GBUS_DUART1_OFFSET },
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{ "mcclock", GBUS_CLOCK_OFFSET },
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{ NULL, 0 },
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{ "zsc", NULL, GBUS_DUART0_OFFSET },
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{ "zsc", NULL, GBUS_DUART1_OFFSET },
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{ "mcclock", NULL, GBUS_CLOCK_OFFSET },
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{ NULL, NULL, 0 },
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};
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static int
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@ -113,6 +113,7 @@ gbusattach(device_t parent, device_t self, void *aux)
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struct gbus_softc *sc = device_private(self);
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struct tlsb_dev_attach_args *ta = aux;
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const struct gbus_attach_args *ga;
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bus_space_tag_t iot = gbus_io_init(TLSB_GBUS_BASE);
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int locs[GBUSCF_NLOCS];
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aprint_normal("\n");
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@ -123,6 +124,7 @@ gbusattach(device_t parent, device_t self, void *aux)
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/* Attach the children. */
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for (ga = gbus_children; ga->ga_name != NULL; ga++) {
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struct gbus_attach_args gaa = *ga;
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gaa.ga_iot = iot;
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locs[GBUSCF_OFFSET] = gaa.ga_offset;
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config_found(self, &gaa, gbusprint,
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CFARGS(.submatch = config_stdsubmatch,
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@ -0,0 +1,177 @@
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/* $NetBSD: gbus_io.c,v 1.1 2024/03/06 05:33:09 thorpej Exp $ */
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/*-
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* Copyright (c) 2024 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Bus space implementation for the Gbus: a general 8-bit bus found
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* on Laser / TurboLaser CPU modules.
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*/
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#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
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__KERNEL_RCSID(0, "$NetBSD: gbus_io.c,v 1.1 2024/03/06 05:33:09 thorpej Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/endian.h>
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#include <sys/vmem.h>
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#include <sys/bus.h>
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#include <alpha/gbus/gbusvar.h>
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/*
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* While physically there is one Gbus per CPU module on the system,
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* logically there is only one (the one on the CPU module that holds
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* the primary CPU), and this describes it.
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*/
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static struct gbus_config {
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paddr_t gc_sysbase; /* system base address of Gbus */
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struct alpha_bus_space gc_st; /* the Gbus's space tag */
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} gbus_config;
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/* Adjacent bytes on the Gbus are spaced 64 bytes apart. */
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#define GBUS_ADDR_SHIFT 6
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static int
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gbus_io_map(
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void *v,
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bus_addr_t addr,
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bus_size_t size __unused,
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int flags __unused,
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bus_space_handle_t *iohp,
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int acct __unused)
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{
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struct gbus_config * const gc = v;
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*iohp = ALPHA_PHYS_TO_K0SEG(gc->gc_sysbase + addr);
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return 0;
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}
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static void
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gbus_io_unmap(
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void *v __unused,
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bus_space_handle_t ioh __unused,
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bus_size_t size __unused,
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int acct __unused)
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{
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/* No work to do. */
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}
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static void
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gbus_io_barrier(
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void *v __unused,
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bus_space_handle_t ioh __unused,
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bus_size_t off __unused,
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bus_size_t len __unused,
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int flags __unused)
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{
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if (flags & BUS_SPACE_BARRIER_READ) {
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alpha_mb();
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} else if (flags & BUS_SPACE_BARRIER_WRITE) {
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alpha_wmb();
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}
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}
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__CTASSERT(_BYTE_ORDER == _LITTLE_ENDIAN);
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/*
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* A 32-bit pointer is used here because the bus transaction is going to
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* be 32-bit regardless, and this avoids having the compiler generate
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* extbl / insbl / mskbl unnecessarily (or r/m/w in the write case).
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*/
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#define GBUS_ADDR(ioh, off) \
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(uint32_t *)((ioh) + ((off) << GBUS_ADDR_SHIFT))
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static uint8_t
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gbus_io_read_1(
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void *v __unused,
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bus_space_handle_t ioh,
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bus_size_t off)
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{
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uint32_t *addr = GBUS_ADDR(ioh, off);
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alpha_mb();
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return (uint8_t)atomic_load_relaxed(addr);
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}
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static void
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gbus_io_write_1(
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void *v __unused,
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bus_space_handle_t ioh,
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bus_size_t off,
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uint8_t val)
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{
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uint32_t *addr = GBUS_ADDR(ioh, off);
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atomic_store_relaxed(addr, (uint32_t)val);
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alpha_mb();
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}
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bus_space_tag_t
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gbus_io_init(paddr_t sysbase)
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{
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struct gbus_config * const gc = &gbus_config;
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bus_space_tag_t t = &gc->gc_st;
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if (t->abs_cookie == gc) {
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/* Already initialized. */
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KASSERT(gc->gc_sysbase == sysbase);
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return t;
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}
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gc->gc_sysbase = sysbase;
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memset(t, 0, sizeof(*t));
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/*
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* Initialize the bus space tag. We just support the bare
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* minimum operations required by Gbus devices.
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*/
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/* cookie */
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t->abs_cookie = gc;
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/* mapping/unmapping */
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t->abs_map = gbus_io_map;
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t->abs_unmap = gbus_io_unmap;
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/* barrier */
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t->abs_barrier = gbus_io_barrier;
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/* read (single) */
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t->abs_r_1 = gbus_io_read_1;
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/* write (single) */
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t->abs_w_1 = gbus_io_write_1;
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return t;
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}
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@ -1,4 +1,4 @@
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/* $NetBSD: gbusvar.h,v 1.1 2024/03/02 19:57:57 thorpej Exp $ */
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/* $NetBSD: gbusvar.h,v 1.2 2024/03/06 05:33:09 thorpej Exp $ */
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/*-
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* Copyright (c) 1998 The NetBSD Foundation, Inc.
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@ -30,6 +30,9 @@
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _ALPHA_GBUS_GBUSVAR_H_
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#define _ALPHA_GBUS_GBUSVAR_H_
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/*
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* Autoconfiguration definitions for the Gbus found on TurboLaser CPU modules.
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*/
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@ -37,6 +40,11 @@
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#include <sys/bus.h>
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struct gbus_attach_args {
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const char *ga_name; /* name of device */
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bus_addr_t ga_offset; /* offset from Gbus base */
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const char * ga_name; /* name of device */
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bus_space_tag_t ga_iot; /* I/O space tag */
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bus_addr_t ga_offset; /* offset from Gbus base */
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};
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bus_space_tag_t gbus_io_init(paddr_t);
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#endif /* _ALPHA_GBUS_GBUSVAR_H_ */
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