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NetBSD/sys/dev/pci/puc.c

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/* $NetBSD: puc.c,v 1.1 1998/06/26 18:52:41 cgd Exp $ */
/*
* Copyright (c) 1996, 1998 Christopher G. Demetriou. 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 Christopher G. Demetriou
* for the NetBSD Project.
* 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.
*/
/*
* PCI "universal" communication card device driver, glues com, lpt,
* and similar ports to PCI via bridge chip often much larger than
* the devices being glued.
*
* Author: Christopher G. Demetriou, May 14, 1998 (derived from NetBSD
* sys/dev/pci/pciide.c, revision 1.6).
*
* These devices could be (and some times are) described as
* communications/{serial,parallel}, etc. devices with known
* programming interfaces, but those programming interfaces (in
* particular the BAR assignments for devices, etc.) in fact are not
* particularly well defined.
*
* After I/we have seen more of these devices, it may be possible
* to generalize some of these bits. In particular, devices which
* describe themselves as communications/serial/16[45]50, and
* communications/parallel/??? might be attached via direct
* 'com' and 'lpt' attachments to pci.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pucvar.h>
struct puc_softc {
struct device sc_dev;
/* static configuration data */
const struct puc_device_description *sc_desc;
/* card-global dynamic data */
void *sc_ih;
struct {
int mapped;
bus_addr_t a;
bus_size_t s;
bus_space_tag_t t;
bus_space_handle_t h;
} sc_bar_mappings[6]; /* XXX constant */
/* per-port dynamic data */
struct {
struct device *dev;
/* filled in by port attachments */
int (*ihand) __P((void *));
void *ihandarg;
} sc_ports[PUC_MAX_PORTS];
};
int puc_match __P((struct device *, struct cfdata *, void *));
void puc_attach __P((struct device *, struct device *, void *));
int puc_print __P((void *, const char *));
int puc_submatch __P((struct device *, struct cfdata *, void *));
struct cfattach puc_ca = {
sizeof(struct puc_softc), puc_match, puc_attach
};
static const struct puc_device_description *
puc_find_description __P((pcireg_t, pcireg_t, pcireg_t, pcireg_t));
static const char *
puc_port_type_name __P((int));
int
puc_match(parent, match, aux)
struct device *parent;
struct cfdata *match;
void *aux;
{
struct pci_attach_args *pa = aux;
const struct puc_device_description *desc;
pcireg_t bhlc, subsys;
bhlc = pci_conf_read(pa->pa_pc, pa->pa_tag, PCI_BHLC_REG);
if (PCI_HDRTYPE_TYPE(bhlc) != 0)
return (0);
subsys = pci_conf_read(pa->pa_pc, pa->pa_tag, 0x2c); /* XXX const */
desc = puc_find_description(PCI_VENDOR(pa->pa_id),
PCI_PRODUCT(pa->pa_id), PCI_VENDOR(subsys), PCI_PRODUCT(subsys));
if (desc != NULL)
return (10);
/*
* Match class/subclass, so we can tell people to compile kernel
* with options that cause this driver to spew.
*/
if (PCI_CLASS(pa->pa_class) == PCI_CLASS_COMMUNICATIONS &&
PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_BRIDGE_PCI)
return (1);
return (0);
}
void
puc_attach(parent, self, aux)
struct device *parent, *self;
void *aux;
{
struct puc_softc *sc = (struct puc_softc *)self;
struct pci_attach_args *pa = aux;
struct puc_attach_args paa;
pci_intr_handle_t intrhandle;
pcireg_t subsys;
int i, barindex;
subsys = pci_conf_read(pa->pa_pc, pa->pa_tag, 0x2c); /* XXX const */
sc->sc_desc = puc_find_description(PCI_VENDOR(pa->pa_id),
PCI_PRODUCT(pa->pa_id), PCI_VENDOR(subsys), PCI_PRODUCT(subsys));
if (sc->sc_desc == NULL) {
/*
* This was a class/subclass match, so tell people to compile
* kernel with options that cause this driver to spew.
*/
#ifdef PUC_PRINT_REGS
printf(":\n");
pci_conf_print(pa->pa_pc, pa->pa_tag, NULL);
#else
printf(": unknown PCI communications device\n");
printf("%s: compile kernel with PUC_PRINT_REGS and larger\n",
sc->sc_dev.dv_xname);
printf("%s: mesage buffer (via 'options MSGBUFSIZE=...'),\n",
sc->sc_dev.dv_xname);
printf("%s: and report the result with send-pr\n",
sc->sc_dev.dv_xname);
#endif
return;
}
printf(": %s (", sc->sc_desc->name);
for (i = 0; PUC_PORT_VALID(sc->sc_desc, i); i++)
printf("%s%s", i ? ", " : "",
puc_port_type_name(sc->sc_desc->ports[i].type));
printf(")\n");
/*
* XXX This driver assumes that 'com' ports attached to it
* XXX can not be console. That isn't unreasonable, because PCI
* XXX devices are supposed to be dynamically mapped, and com
* XXX console ports want fixed addresses. When/if baseboard
* XXX 'com' ports are identified as PCI/communications/serial
* XXX devices and are known to be mapped at the standard
* XXX addresses, if they can be the system console then we have
* XXX to cope with doing the mapping right. Then this will get
* XXX really ugly. Of course, by then we might know the real
* XXX definition of PCI/communications/serial, and attach 'com'
* XXX directly on PCI.
*/
for (i = 0; i < 6; i++) {
pcireg_t bar, type;
sc->sc_bar_mappings[i].mapped = 0;
bar = pci_conf_read(pa->pa_pc, pa->pa_tag,
PCI_MAPREG_START + 4 * i); /* XXX const */
if (bar == 0) /* BAR not implemented(?) */
continue;
type = (PCI_MAPREG_TYPE(bar) == PCI_MAPREG_TYPE_IO ?
PCI_MAPREG_TYPE_IO : PCI_MAPREG_MEM_TYPE(bar));
sc->sc_bar_mappings[i].mapped = (pci_mapreg_map(pa,
PCI_MAPREG_START + 4 * i, type, 0,
&sc->sc_bar_mappings[i].t, &sc->sc_bar_mappings[i].h,
&sc->sc_bar_mappings[i].a, &sc->sc_bar_mappings[i].s)
== 0);
if (sc->sc_bar_mappings[i].mapped)
continue;
printf("%s: couldn't map BAR at offset 0x%lx\n",
sc->sc_dev.dv_xname, (long)(PCI_MAPREG_START + 4 * i));
}
/* Map interrupt. */
if (pci_intr_map(pa->pa_pc, pa->pa_intrtag, pa->pa_intrpin,
pa->pa_intrline, &intrhandle)) {
printf("%s: couldn't map interrupt\n", sc->sc_dev.dv_xname);
return;
}
/*
* XXX the sub-devices establish the interrupts, for the
* XXX following reasons:
* XXX
* XXX * we can't really know what IPLs they'd want
* XXX
* XXX * the MD dispatching code can ("should") dispatch
* XXX chained interrupts better than we can.
* XXX
* XXX It would be nice if we could indicate to the MD interrupt
* XXX handling code that the interrupt line used by the device
* XXX was a PCI (level triggered) interrupt.
* XXX
* XXX It's not pretty, but hey, what is?
*/
/* Configure each port. */
for (i = 0; PUC_PORT_VALID(sc->sc_desc, i); i++) {
/* make sure the base address register is mapped */
barindex = PUC_PORT_BAR_INDEX(sc->sc_desc->ports[i].bar);
if (!sc->sc_bar_mappings[barindex].mapped) {
printf("%s: %s port uses unmapped BAR (0x%x)\n",
sc->sc_dev.dv_xname,
puc_port_type_name(sc->sc_desc->ports[i].type),
sc->sc_desc->ports[i].bar);
continue;
}
/* set up to configure the child device */
paa.port = i;
paa.type = sc->sc_desc->ports[i].type;
paa.pc = pa->pa_pc;
paa.intrhandle = intrhandle;
paa.a = sc->sc_bar_mappings[barindex].a;
paa.s = sc->sc_bar_mappings[barindex].s;
paa.t = sc->sc_bar_mappings[barindex].t;
paa.h = sc->sc_bar_mappings[barindex].h;
#if 0
printf("%s: port %d: %s @ (index %d) 0x%x/%d (0x%lx, 0x%lx)\n",
sc->sc_dev.dv_xname, paa.port,
puc_port_type_name(paa.type), barindex, (int)paa.a,
(int)paa.s, (long)paa.t, (long)paa.h);
#endif
/* and configure it */
sc->sc_ports[i].dev = config_found_sm(self, &paa, puc_print,
puc_submatch);
}
}
int
puc_print(aux, pnp)
void *aux;
const char *pnp;
{
struct puc_attach_args *paa = aux;
if (pnp)
printf("%s at %s", puc_port_type_name(paa->type), pnp);
printf(" port %d", paa->port);
return (UNCONF);
}
int
puc_submatch(parent, cf, aux)
struct device *parent;
struct cfdata *cf;
void *aux;
{
struct puc_attach_args *aa = aux;
if (cf->cf_loc[PUCCF_PORT] != PUCCF_PORT_DEFAULT &&
cf->cf_loc[PUCCF_PORT] != aa->port)
return 0;
return ((*cf->cf_attach->ca_match)(parent, cf, aux));
}
static const struct puc_device_description *
puc_find_description(vend, prod, svend, sprod)
pcireg_t vend, prod, svend, sprod;
{
int i;
#define checkreg(val, index) \
(((val) & puc_devices[i].rmask[(index)]) == puc_devices[i].rval[(index)])
for (i = 0; puc_devices[i].name != NULL; i++) {
if (checkreg(vend, PUC_REG_VEND) &&
checkreg(prod, PUC_REG_PROD) &&
checkreg(svend, PUC_REG_SVEND) &&
checkreg(sprod, PUC_REG_SPROD))
return (&puc_devices[i]);
}
#undef checkreg
return (NULL);
}
static const char *
puc_port_type_name(type)
int type;
{
switch (type) {
case PUC_PORT_TYPE_COM:
return "com";
case PUC_PORT_TYPE_LPT:
return "lpt";
default:
panic("puc_port_type_name %d", type);
}
}
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