NetBSD/sys/arch/sandpoint/pci/pci_machdep.c

326 lines
8.4 KiB
C

/* $NetBSD: pci_machdep.c,v 1.7 2001/10/29 23:37:37 thorpej Exp $ */
/*
* Copyright (c) 1996 Christopher G. Demetriou. All rights reserved.
* Copyright (c) 1994 Charles M. Hannum. 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 Charles M. Hannum.
* 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.
*/
/*
* Machine-specific functions for PCI autoconfiguration.
*
* On PCs, there are two methods of generating PCI configuration cycles.
* We try to detect the appropriate mechanism for this machine and set
* up a few function pointers to access the correct method directly.
*
* The configuration method can be hard-coded in the config file by
* using `options PCI_CONF_MODE=N', where `N' is the configuration mode
* as defined section 3.6.4.1, `Generating Configuration Cycles'.
*/
#include "opt_openpic.h"
#include <sys/types.h>
#include <sys/param.h>
#include <sys/device.h>
#include <sys/errno.h>
#include <sys/extent.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <uvm/uvm.h>
#define _POWERPC_BUS_DMA_PRIVATE
#include <machine/bus.h>
#include <machine/pio.h>
#include <machine/intr.h>
#include <dev/isa/isavar.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pciconf.h>
#include <sandpoint/isa/icu.h>
struct powerpc_bus_dma_tag pci_bus_dma_tag = {
0, /* _bounce_thresh */
_bus_dmamap_create,
_bus_dmamap_destroy,
_bus_dmamap_load,
_bus_dmamap_load_mbuf,
_bus_dmamap_load_uio,
_bus_dmamap_load_raw,
_bus_dmamap_unload,
NULL, /* _dmamap_sync */
_bus_dmamem_alloc,
_bus_dmamem_free,
_bus_dmamem_map,
_bus_dmamem_unmap,
_bus_dmamem_mmap,
};
#define PCI_CONFIG_ENABLE 0x80000000UL
void
pci_attach_hook(parent, self, pba)
struct device *parent, *self;
struct pcibus_attach_args *pba;
{
}
int
pci_bus_maxdevs(pc, busno)
pci_chipset_tag_t pc;
int busno;
{
/*
* Bus number is irrelevant. Configuration Mechanism 1 is in
* use, can have devices 0-32 (i.e. the `normal' range).
*/
return (32);
}
pcitag_t
pci_make_tag(pc, bus, device, function)
pci_chipset_tag_t pc;
int bus, device, function;
{
pcitag_t tag;
if (bus >= 256 || device >= 32 || function >= 8)
panic("pci_make_tag: bad request");
tag = PCI_CONFIG_ENABLE |
(bus << 16) | (device << 11) | (function << 8);
return tag;
}
void
pci_decompose_tag(pc, tag, bp, dp, fp)
pci_chipset_tag_t pc;
pcitag_t tag;
int *bp, *dp, *fp;
{
if (bp != NULL)
*bp = (tag >> 16) & 0xff;
if (dp != NULL)
*dp = (tag >> 11) & 0x1f;
if (fp != NULL)
*fp = (tag >> 8) & 0x7;
return;
}
/*
* The Kahlua documentation says that "reg" should be left-shifted by two
* and be in bits 2-7. Apparently not. It doesn't work that way, and the
* DINK32 ROM doesn't do it that way (I peeked at 0xfec00000 after running
* the DINK32 "pcf" command).
*/
#define SP_PCI(tag, reg) ((tag) | (reg))
pcireg_t
pci_conf_read(pc, tag, reg)
pci_chipset_tag_t pc;
pcitag_t tag;
int reg;
{
pcireg_t data;
out32rb(SANDPOINT_PCI_CONFIG_ADDR, SP_PCI(tag,reg));
data = in32rb(SANDPOINT_PCI_CONFIG_DATA);
out32rb(SANDPOINT_PCI_CONFIG_ADDR, 0);
return data;
}
void
pci_conf_write(pc, tag, reg, data)
pci_chipset_tag_t pc;
pcitag_t tag;
int reg;
pcireg_t data;
{
out32rb(SANDPOINT_PCI_CONFIG_ADDR, SP_PCI(tag, reg));
out32rb(SANDPOINT_PCI_CONFIG_DATA, data);
out32rb(SANDPOINT_PCI_CONFIG_ADDR, 0);
}
int
pci_intr_map(pa, ihp)
struct pci_attach_args *pa;
pci_intr_handle_t *ihp;
{
int pin = pa->pa_intrpin;
int line = pa->pa_intrline;
if (pin == 0) {
/* No IRQ used. */
goto bad;
}
if (pin > 4) {
printf("pci_intr_map: bad interrupt pin %d\n", pin);
goto bad;
}
/*
* Section 6.2.4, `Miscellaneous Functions', says that 255 means
* `unknown' or `no connection' on a PC. We assume that a device with
* `no connection' either doesn't have an interrupt (in which case the
* pin number should be 0, and would have been noticed above), or
* wasn't configured by the BIOS (in which case we punt, since there's
* no real way we can know how the interrupt lines are mapped in the
* hardware).
*
* XXX
* Since IRQ 0 is only used by the clock, and we can't actually be sure
* that the BIOS did its job, we also recognize that as meaning that
* the BIOS has not configured the device.
*/
if (line == 255) {
printf("pci_intr_map: no mapping for pin %c\n", '@' + pin);
goto bad;
} else {
/*
* Sandpoint has 4 PCI slots.
* Sandpoint rev. X2 has them in a weird order. Counting
* from center out toward the edge, we have:
* Slot 1 (dev 14?) (labelled 1)
* Slot 0 (dev 13?) (labelled 2)
* Slot 3 (dev 16) (labelled 3)
* Slot 2 (dev 15) (labelled 4)
* To keep things confusing, we will consistently use a zero-
* based numbering scheme where Motorola's is usually 1-based.
*/
if (line < 13 || line > 16) {
printf("pci_intr_map: bad interrupt line %d\n", line);
goto bad;
}
}
/*
* In the PCI configuration code, we simply assign the dev
* number to the interrupt line. We extract it here for the
* interrupt, but subtract off the lowest dev (13) to get
* the IRQ.
*/
#if defined(OPENPIC_SERIAL_MODE)
line -= 11;
#else
line -= 13;
#endif
*ihp = line;
return 0;
bad:
*ihp = -1;
return 1;
}
const char *
pci_intr_string(pc, ih)
pci_chipset_tag_t pc;
pci_intr_handle_t ih;
{
static char irqstr[8]; /* 4 + 2 + NULL + sanity */
if (ih < 0 || ih >= ICU_LEN)
panic("pci_intr_string: bogus handle 0x%x\n", ih);
sprintf(irqstr, "irq %d", ih);
return (irqstr);
}
const struct evcnt *
pci_intr_evcnt(pc, ih)
pci_chipset_tag_t pc;
pci_intr_handle_t ih;
{
/* XXX for now, no evcnt parent reported */
return NULL;
}
void *
pci_intr_establish(pc, ih, level, func, arg)
pci_chipset_tag_t pc;
pci_intr_handle_t ih;
int level, (*func) __P((void *));
void *arg;
{
#if 0
if (ih < SANDPOINT_INTR_PCI0 || ih > SANDPOINT_INTR_PCI3)
panic("pci_intr_establish: bogus handle 0x%x\n", ih);
#endif
/*
* ih is the value assigned in pci_intr_map(), above.
* For the Sandpoint, this is the zero-based slot #,
* configured when the bus is set up.
*/
return intr_establish(ih, IST_LEVEL, level, func, arg);
}
void
pci_intr_disestablish(pc, cookie)
pci_chipset_tag_t pc;
void *cookie;
{
intr_disestablish(cookie);
}
void
pci_conf_interrupt(pci_chipset_tag_t pc, int bus, int dev, int pin, int swiz,
int *iline)
{
if (bus == 0) {
*iline = dev;
} else {
/*
* If we are not on bus zero, we're behind a bridge, so we
* swizzle.
*
* The documentation lies about this. In slot 3 (numbering
* from 0) aka device 16, INTD# becomes an interrupt for
* slot 2. INTC# becomes an interrupt for slot 1, etc.
* In slot 2 aka device 16, INTD# becomes an interrupt for
* slot 1, etc.
*
* Verified for INTD# on device 16, INTC# on device 16,
* INTD# on device 15, INTD# on device 13, and INTC# on
* device 14. I presume that the rest follow the same
* pattern.
*
* Slot 0 is device 13, and is the base for the rest.
*/
*iline = 13 + ((swiz + dev + 3) & 3);
}
}