/* $NetBSD: cia.c,v 1.81 2023/12/04 00:32:10 thorpej Exp $ */
/*-
* Copyright (c) 1998, 2000 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) 1995, 1996 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chris G. Demetriou
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or
[email protected]
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
#include "opt_dec_550.h"
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: cia.c,v 1.81 2023/12/04 00:32:10 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <machine/autoconf.h>
#include <machine/rpb.h>
#include <machine/sysarch.h>
#include <machine/alpha.h>
#include <dev/isa/isareg.h>
#include <dev/isa/isavar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <alpha/pci/ciareg.h>
#include <alpha/pci/ciavar.h>
static int ciamatch(device_t, cfdata_t, void *);
static void ciaattach(device_t, device_t, void *);
CFATTACH_DECL_NEW(cia, sizeof(struct cia_softc),
ciamatch, ciaattach, NULL, NULL);
extern struct cfdriver cia_cd;
static int cia_bus_get_window(int, int,
struct alpha_bus_space_translation *);
/* There can be only one. */
static int ciafound;
struct cia_config cia_configuration;
/*
* This determines if we attempt to use BWX for PCI bus and config space
* access. Some systems, notably with Pyxis, don't fare so well unless
* BWX is used.
*
* EXCEPT! Some devices have a really hard time if BWX is used (WHY?!).
* So, we decouple the uses for PCI config space and PCI bus space.
*
* FURTHERMORE! The Pyxis, most notably earlier revs, really don't
* do so well if you don't use BWX for bus access. So we default to
* forcing BWX on those chips.
*
* Geez.
*/
#ifndef CIA_PCI_USE_BWX
#define CIA_PCI_USE_BWX 1
#endif
#ifndef CIA_BUS_USE_BWX
#define CIA_BUS_USE_BWX 0
#endif
#ifndef CIA_PYXIS_FORCE_BWX
#define CIA_PYXIS_FORCE_BWX 0
#endif
int cia_pci_use_bwx = CIA_PCI_USE_BWX;
int cia_bus_use_bwx = CIA_BUS_USE_BWX;
int cia_pyxis_force_bwx = CIA_PYXIS_FORCE_BWX;
static int
ciamatch(device_t parent, cfdata_t match, void *aux)
{
struct mainbus_attach_args *ma = aux;
/* Make sure that we're looking for a CIA. */
if (strcmp(ma->ma_name, cia_cd.cd_name) != 0)
return (0);
if (ciafound)
return (0);
return (1);
}
/*
* Set up the chipset's function pointers.
*/
void
cia_init(struct cia_config *ccp)
{
int pci_use_bwx = cia_pci_use_bwx;
int bus_use_bwx = cia_bus_use_bwx;
ccp->cc_hae_mem = REGVAL(CIA_CSR_HAE_MEM);
ccp->cc_hae_io = REGVAL(CIA_CSR_HAE_IO);
ccp->cc_rev = REGVAL(CIA_CSR_REV) & REV_MASK;
/*
* Determine if we have a Pyxis. Only two systypes can
* have this: the EB164 systype (AlphaPC164LX and AlphaPC164SX)
* and the DEC_550 systype (Miata).
*/
if ((cputype == ST_EB164 &&
(hwrpb->rpb_variation & SV_ST_MASK) >= SV_ST_ALPHAPC164LX_400) ||
cputype == ST_DEC_550) {
ccp->cc_flags |= CCF_ISPYXIS;
if (cia_pyxis_force_bwx)
pci_use_bwx = bus_use_bwx = 1;
}
/*
* ALCOR/ALCOR2 Revisions >= 2 and Pyxis have the CNFG register.
*/
if (ccp->cc_rev >= 2 || (ccp->cc_flags & CCF_ISPYXIS) != 0)
ccp->cc_cnfg = REGVAL(CIA_CSR_CNFG);
else
ccp->cc_cnfg = 0;
/*
* Use BWX iff:
*
* - It hasn't been disabled by the user,
* - it's enabled in CNFG,
* - we're implementation version ev5,
* - BWX is enabled in the CPU's capabilities mask
*/
if ((pci_use_bwx || bus_use_bwx) &&
(ccp->cc_cnfg & CNFG_BWEN) != 0 &&
(cpu_amask & ALPHA_AMASK_BWX) != 0) {
uint32_t ctrl;
if (pci_use_bwx)
ccp->cc_flags |= CCF_PCI_USE_BWX;
if (bus_use_bwx)
ccp->cc_flags |= CCF_BUS_USE_BWX;
/*
* For whatever reason, the firmware seems to enable PCI
* loopback mode if it also enables BWX. Make sure it's
* enabled if we have an old, buggy firmware rev.
*/
alpha_mb();
ctrl = REGVAL(CIA_CSR_CTRL);
if ((ctrl & CTRL_PCI_LOOP_EN) == 0) {
REGVAL(CIA_CSR_CTRL) = ctrl | CTRL_PCI_LOOP_EN;
alpha_mb();
}
}
if (!ccp->cc_initted) {
/* don't do these twice since they set up extents */
if (ccp->cc_flags & CCF_BUS_USE_BWX) {
cia_bwx_bus_io_init(&ccp->cc_iot, ccp);
cia_bwx_bus_mem_init(&ccp->cc_memt, ccp);
/*
* We have one window for both PCI I/O and MEM
* in BWX mode.
*/
alpha_bus_window_count[ALPHA_BUS_TYPE_PCI_IO] = 1;
alpha_bus_window_count[ALPHA_BUS_TYPE_PCI_MEM] = 1;
} else {
cia_swiz_bus_io_init(&ccp->cc_iot, ccp);
cia_swiz_bus_mem_init(&ccp->cc_memt, ccp);
/*
* We have two I/O windows and 4 MEM windows in
* SWIZ mode.
*/
alpha_bus_window_count[ALPHA_BUS_TYPE_PCI_IO] = 2;
alpha_bus_window_count[ALPHA_BUS_TYPE_PCI_MEM] = 4;
}
alpha_bus_get_window = cia_bus_get_window;
}
cia_pci_init(&ccp->cc_pc, ccp);
alpha_pci_chipset = &ccp->cc_pc;
ccp->cc_initted = 1;
}
static void
ciaattach(device_t parent, device_t self, void *aux)
{
struct cia_softc *sc = device_private(self);
struct cia_config *ccp;
struct pcibus_attach_args pba;
char bits[64];
const char *name;
/* note that we've attached the chipset; can't have 2 CIAs. */
ciafound = 1;
sc->sc_dev = self;
/*
* set up the chipset's info; done once at console init time
* (maybe), but we must do it here as well to take care of things
* that need to use memory allocation.
*/
ccp = sc->sc_ccp = &cia_configuration;
cia_init(ccp);
if (ccp->cc_flags & CCF_ISPYXIS) {
name = "Pyxis";
} else {
name = "ALCOR/ALCOR2";
}
aprint_normal(": DECchip 2117x Core Logic Chipset (%s), pass %d\n",
name, ccp->cc_rev + 1);
if (ccp->cc_cnfg) {
snprintb(bits, sizeof(bits), CIA_CSR_CNFG_BITS, ccp->cc_cnfg);
aprint_normal_dev(self, "extended capabilities: %s\n", bits);
}
switch (ccp->cc_flags & (CCF_PCI_USE_BWX|CCF_BUS_USE_BWX)) {
case CCF_PCI_USE_BWX|CCF_BUS_USE_BWX:
name = "PCI config and bus";
break;
case CCF_PCI_USE_BWX:
name = "PCI config";
break;
case CCF_BUS_USE_BWX:
name = "bus";
break;
default:
name = NULL;
break;
}
if (name != NULL)
aprint_normal_dev(self, "using BWX for %s access\n", name);
#ifdef DEC_550
if (cputype == ST_DEC_550 &&
(hwrpb->rpb_variation & SV_ST_MASK) < SV_ST_MIATA_1_5) {
/*
* Miata 1 systems have a bug: DMA cannot cross
* an 8k boundary! Make sure PCI read prefetching
* is disabled on these chips. Note that secondary
* PCI busses don't have this problem, because of
* the way PPBs handle PCI read requests.
*
* In the 21174 Technical Reference Manual, this is
* actually documented as "Pyxis Pass 1", but apparently
* there are chips that report themselves as "Pass 1"
* which do not have the bug! Miatas with the Cypress
* PCI-ISA bridge (i.e. Miata 1.5 and Miata 2) do not
* have the bug, so we use this check.
*
* NOTE: This bug is actually worked around in cia_dma.c,
* when direct-mapped DMA maps are created.
*
* XXX WE NEED TO THINK ABOUT HOW TO HANDLE THIS FOR
* XXX SGMAP DMA MAPPINGS!
*/
uint32_t ctrl;
/* XXX no bets... */
aprint_error_dev(self,
"WARNING: Pyxis pass 1 DMA bug; no bets...\n");
ccp->cc_flags |= CCF_PYXISBUG;
alpha_mb();
ctrl = REGVAL(CIA_CSR_CTRL);
ctrl &= ~(CTRL_RD_TYPE|CTRL_RL_TYPE|CTRL_RM_TYPE);
REGVAL(CIA_CSR_CTRL) = ctrl;
alpha_mb();
}
#endif /* DEC_550 */
cia_dma_init(ccp);
alpha_pci_intr_init(ccp, &ccp->cc_iot, &ccp->cc_memt, &ccp->cc_pc);
pba.pba_iot = &ccp->cc_iot;
pba.pba_memt = &ccp->cc_memt;
pba.pba_dmat =
alphabus_dma_get_tag(&ccp->cc_dmat_direct, ALPHA_BUS_PCI);
pba.pba_dmat64 = NULL;
pba.pba_pc = &ccp->cc_pc;
pba.pba_bus = 0;
pba.pba_bridgetag = NULL;
pba.pba_flags = PCI_FLAGS_IO_OKAY | PCI_FLAGS_MEM_OKAY;
if ((ccp->cc_flags & CCF_PYXISBUG) == 0)
pba.pba_flags |= PCI_FLAGS_MRL_OKAY | PCI_FLAGS_MRM_OKAY |
PCI_FLAGS_MWI_OKAY;
config_found(self, &pba, pcibusprint, CFARGS_NONE);
}
static int
cia_bus_get_window(int type, int window,
struct alpha_bus_space_translation *abst)
{
struct cia_config *ccp = &cia_configuration;
bus_space_tag_t st;
switch (type) {
case ALPHA_BUS_TYPE_PCI_IO:
st = &ccp->cc_iot;
break;
case ALPHA_BUS_TYPE_PCI_MEM:
st = &ccp->cc_memt;
break;
default:
panic("cia_bus_get_window");
}
return (alpha_bus_space_get_window(st, window, abst));
}
void
cia_pyxis_intr_enable(int irq, int onoff)
{
uint64_t imask;
int s;
#if 0
printf("cia_pyxis_intr_enable: %s %d\n",
onoff ? "enabling" : "disabling", irq);
#endif
s = splhigh();
alpha_mb();
imask = REGVAL64(PYXIS_INT_MASK);
if (onoff)
imask |= (1UL << irq);
else
imask &= ~(1UL << irq);
REGVAL64(PYXIS_INT_MASK) = imask;
alpha_mb();
splx(s);
}
