f363b73f87
(Lynx), written from scratch by me over a year ago, but never committed to the tree because there was a bug I could never quite find. I have fixed a few problems in the code, but still don't know if that bug is quite fixed. Since I don't have access to the hardware directly, I'll have to call for testers again.
249 lines
6.7 KiB
C
249 lines
6.7 KiB
C
/* $NetBSD: ttwoga_pci.c,v 1.1 2000/12/21 20:51:55 thorpej Exp $ */
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/*-
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* Copyright (c) 1999, 2000 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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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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#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
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__KERNEL_RCSID(0, "$NetBSD: ttwoga_pci.c,v 1.1 2000/12/21 20:51:55 thorpej Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/device.h>
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#include <sys/lock.h>
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#include <dev/pci/pcireg.h>
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#include <dev/pci/pcivar.h>
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#include <alpha/pci/ttwogareg.h>
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#include <alpha/pci/ttwogavar.h>
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void ttwoga_attach_hook(struct device *, struct device *,
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struct pcibus_attach_args *);
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int ttwoga_bus_maxdevs(void *, int);
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pcitag_t ttwoga_make_tag(void *, int, int, int);
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void ttwoga_decompose_tag(void *, pcitag_t, int *, int *,
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int *);
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pcireg_t ttwoga_conf_read(void *, pcitag_t, int);
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void ttwoga_conf_write(void *, pcitag_t, int, pcireg_t);
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paddr_t ttwoga_make_type0addr(int, int);
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/*
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* The T2 has an annoying bug that can manifest itself while
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* probing for devices. If a non-existent CBUS address is
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* accessed with a read, "a few" subsequent write cycles
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* will generate spurious memory errors. We work around this
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* by tracking which CPU has the PCI configuration mutex and
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* "expect" machine checks on that CPU for the duraction of
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* the PCI configuration access routine.
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*/
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struct simplelock ttwoga_conf_slock;
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cpuid_t ttwoga_conf_cpu; /* XXX core logic bug */
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#define TTWOGA_CONF_LOCK(s) \
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do { \
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(s) = splhigh(); \
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simple_lock(&ttwoga_conf_slock); \
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ttwoga_conf_cpu = cpu_number(); \
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} while (0)
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#define TTWOGA_CONF_UNLOCK(s) \
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do { \
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ttwoga_conf_cpu = (cpuid_t)-1; \
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simple_unlock(&ttwoga_conf_slock); \
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splx((s)); \
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} while (0)
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void
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ttwoga_pci_init(pci_chipset_tag_t pc, void *v)
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{
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simple_lock_init(&ttwoga_conf_slock);
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pc->pc_conf_v = v;
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pc->pc_attach_hook = ttwoga_attach_hook;
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pc->pc_bus_maxdevs = ttwoga_bus_maxdevs;
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pc->pc_make_tag = ttwoga_make_tag;
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pc->pc_decompose_tag = ttwoga_decompose_tag;
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pc->pc_conf_read = ttwoga_conf_read;
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pc->pc_conf_write = ttwoga_conf_write;
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}
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void
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ttwoga_attach_hook(struct device *parent, struct device *self,
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struct pcibus_attach_args *pba)
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{
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}
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int
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ttwoga_bus_maxdevs(void *cpv, int busno)
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{
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return 32;
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}
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pcitag_t
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ttwoga_make_tag(void *cpv, int b, int d, int f)
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{
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/* This is the format used for Type 1 configuration cycles. */
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return (b << 16) | (d << 11) | (f << 8);
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}
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void
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ttwoga_decompose_tag(void *cpv, pcitag_t tag, int *bp, int *dp, int *fp)
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{
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if (bp != NULL)
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*bp = (tag >> 16) & 0xff;
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if (dp != NULL)
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*dp = (tag >> 11) & 0x1f;
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if (fp != NULL)
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*fp = (tag >> 8) & 0x7;
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}
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paddr_t
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ttwoga_make_type0addr(int d, int f)
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{
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if (d > 8) /* XXX ??? */
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return ((paddr_t) -1);
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return ((0x0800UL << d) | (f << 8));
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}
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pcireg_t
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ttwoga_conf_read(void *cpv, pcitag_t tag, int offset)
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{
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struct ttwoga_config *tcp = cpv;
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pcireg_t *datap, data;
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int s, b, d, f, ba;
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paddr_t addr;
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u_int64_t old_hae3;
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alpha_pci_decompose_tag(&tcp->tc_pc, tag, &b, &d, &f);
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addr = b ? tag : ttwoga_make_type0addr(d, f);
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if (addr == (paddr_t)-1)
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return ((pcireg_t) -1);
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TTWOGA_CONF_LOCK(s);
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alpha_mb();
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old_hae3 = T2GA(tcp, T2_HAE0_3) & ~HAE0_3_PCA;
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T2GA(tcp, T2_HAE0_3) =
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old_hae3 | ((b ? 1UL : 0UL) << HAE0_3_PCA_SHIFT);
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alpha_mb();
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alpha_mb();
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datap =
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(pcireg_t *)ALPHA_PHYS_TO_K0SEG(tcp->tc_sysmap->tsmap_conf_base |
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addr << 5UL | /* address shift */
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(offset & ~0x03) << 5UL | /* address shift */
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0x3 << 3UL); /* 4-byte, size shift */
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data = (pcireg_t)-1;
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if (!(ba = badaddr(datap, sizeof *datap)))
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data = *datap;
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alpha_mb();
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T2GA(tcp, T2_HAE0_3) = old_hae3;
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alpha_mb();
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alpha_mb();
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alpha_pal_draina();
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alpha_mb();
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alpha_mb();
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TTWOGA_CONF_UNLOCK(s);
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#if 0
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printf("ttwoga_conf_read: tag 0x%lx, reg 0x%x -> 0x%x @ %p%s\n",
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tag, offset, data, datap, ba ? " (badaddr)" : "");
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#endif
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return (data);
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}
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void
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ttwoga_conf_write(void *cpv, pcitag_t tag, int offset, pcireg_t data)
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{
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struct ttwoga_config *tcp = cpv;
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pcireg_t *datap;
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int s, b, d, f;
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paddr_t addr;
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u_int64_t old_hae3;
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alpha_pci_decompose_tag(&tcp->tc_pc, tag, &b, &d, &f);
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addr = b ? tag : ttwoga_make_type0addr(d, f);
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if (addr == (paddr_t)-1)
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return;
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TTWOGA_CONF_LOCK(s);
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alpha_mb();
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old_hae3 = T2GA(tcp, T2_HAE0_3) & ~HAE0_3_PCA;
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T2GA(tcp, T2_HAE0_3) =
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old_hae3 | ((b ? 1UL : 0UL) << HAE0_3_PCA_SHIFT);
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alpha_mb();
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alpha_mb();
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datap =
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(pcireg_t *)ALPHA_PHYS_TO_K0SEG(tcp->tc_sysmap->tsmap_conf_base |
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addr << 5UL | /* address shift */
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(offset & ~0x03) << 5UL | /* address shift */
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0x3 << 3UL); /* 4-byte, size shift */
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alpha_mb();
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*datap = data;
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alpha_mb();
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alpha_mb();
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alpha_mb();
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T2GA(tcp, T2_HAE0_3) = old_hae3;
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alpha_mb();
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alpha_mb();
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TTWOGA_CONF_UNLOCK(s);
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#if 0
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printf("ttwoga_conf_write: tag 0x%lx, reg 0x%x -> 0x%x @ %p\n",
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tag, offset, data, datap);
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#endif
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}
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