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

435 lines
10 KiB
C

/* $NetBSD: pci_machdep.c,v 1.13 2000/06/29 08:10:46 mrg 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 <sys/types.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/device.h>
#include <uvm/uvm_extern.h>
#define _MACPPC_BUS_DMA_PRIVATE
#include <machine/bus.h>
#include <machine/bus.h>
#include <machine/pio.h>
#include <machine/intr.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_pci.h>
static void fixpci __P((int, pci_chipset_tag_t));
static int find_node_intr __P((int, u_int32_t *, u_int32_t *));
/*
* PCI doesn't have any special needs; just use the generic versions
* of these functions.
*/
struct macppc_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,
};
void
pci_attach_hook(parent, self, pba)
struct device *parent, *self;
struct pcibus_attach_args *pba;
{
pci_chipset_tag_t pc = pba->pba_pc;
int bus = pba->pba_bus;
int node, nn, sz;
int32_t busrange[2];
for (node = pc->node; node; node = nn) {
sz = OF_getprop(node, "bus-range", busrange, 8);
if (sz == 8 && busrange[0] == bus) {
fixpci(node, pc);
return;
}
if ((nn = OF_child(node)) != 0)
continue;
while ((nn = OF_peer(node)) == 0) {
node = OF_parent(node);
if (node == pc->node)
return; /* not found */
}
}
}
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");
/* XXX magic number */
tag = 0x80000000 | (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) & 0x07;
}
pcireg_t
pci_conf_read(pc, tag, reg)
pci_chipset_tag_t pc;
pcitag_t tag;
int reg;
{
return (*pc->conf_read)(pc, tag, reg);
}
void
pci_conf_write(pc, tag, reg, data)
pci_chipset_tag_t pc;
pcitag_t tag;
int reg;
pcireg_t data;
{
(*pc->conf_write)(pc, tag, reg, data);
}
int
pci_intr_map(pc, intrtag, pin, line, ihp)
pci_chipset_tag_t pc;
pcitag_t intrtag;
int pin, line;
pci_intr_handle_t *ihp;
{
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 == 0 || line == 255) {
printf("pci_intr_map: no mapping for pin %c\n", '@' + pin);
goto bad;
} else {
if (line >= ICU_LEN) {
printf("pci_intr_map: bad interrupt line %d\n", line);
goto bad;
}
}
*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;
}
extern void * intr_establish();
extern void intr_disestablish();
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 (ih == 0 || ih >= ICU_LEN)
panic("pci_intr_establish: bogus handle 0x%x\n", ih);
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);
}
#define pcibus(x) \
(((x) & OFW_PCI_PHYS_HI_BUSMASK) >> OFW_PCI_PHYS_HI_BUSSHIFT)
#define pcidev(x) \
(((x) & OFW_PCI_PHYS_HI_DEVICEMASK) >> OFW_PCI_PHYS_HI_DEVICESHIFT)
#define pcifunc(x) \
(((x) & OFW_PCI_PHYS_HI_FUNCTIONMASK) >> OFW_PCI_PHYS_HI_FUNCTIONSHIFT)
void
fixpci(parent, pc)
int parent;
pci_chipset_tag_t pc;
{
int node;
pcitag_t tag;
pcireg_t csr, intr;
int len, i;
int32_t irqs[4];
struct {
u_int32_t phys_hi, phys_mid, phys_lo;
u_int32_t size_hi, size_lo;
} addr[8];
for (node = OF_child(parent); node; node = OF_peer(node)) {
len = OF_getprop(node, "assigned-addresses", addr,
sizeof(addr));
if (len < (int)sizeof(addr[0]))
continue;
tag = pci_make_tag(pc, pcibus(addr[0].phys_hi),
pcidev(addr[0].phys_hi),
pcifunc(addr[0].phys_hi));
/*
* Make sure the IO and MEM enable bits are set in the CSR.
*/
csr = pci_conf_read(pc, tag, PCI_COMMAND_STATUS_REG);
csr &= ~(PCI_COMMAND_IO_ENABLE | PCI_COMMAND_MEM_ENABLE);
for (i = 0; i < len / sizeof(addr[0]); i++) {
switch (addr[i].phys_hi & OFW_PCI_PHYS_HI_SPACEMASK) {
case OFW_PCI_PHYS_HI_SPACE_IO:
csr |= PCI_COMMAND_IO_ENABLE;
break;
case OFW_PCI_PHYS_HI_SPACE_MEM32:
csr |= PCI_COMMAND_MEM_ENABLE;
break;
}
}
pci_conf_write(pc, tag, PCI_COMMAND_STATUS_REG, csr);
/*
* Make sure the line register is programmed with the
* interrupt mapping.
*/
if (find_node_intr(node, &addr[0].phys_hi, irqs) == -1)
continue;
intr = pci_conf_read(pc, tag, PCI_INTERRUPT_REG);
intr &= ~PCI_INTERRUPT_LINE_MASK;
intr |= irqs[0] & PCI_INTERRUPT_LINE_MASK;
pci_conf_write(pc, tag, PCI_INTERRUPT_REG, intr);
}
}
/*
* Find PCI IRQ of the node from OF tree.
*/
int
find_node_intr(node, addr, intr)
int node;
u_int32_t *addr, *intr;
{
int parent, len, mlen, iparent;
int match, i;
u_int32_t map[64], *mp;
u_int32_t imask[8], maskedaddr[8];
u_int32_t icells;
char name[32];
len = OF_getprop(node, "AAPL,interrupts", intr, 4) ;
if (len == 4)
return len;
parent = OF_parent(node);
len = OF_getprop(parent, "interrupt-map", map, sizeof(map));
mlen = OF_getprop(parent, "interrupt-map-mask", imask, sizeof(imask));
if (len == -1 || mlen == -1)
goto nomap;
#ifdef DIAGNOSTIC
if (mlen == sizeof(imask)) {
printf("interrupt-map too long\n");
return -1;
}
#endif
/* mask addr by "interrupt-map-mask" */
bcopy(addr, maskedaddr, mlen);
for (i = 0; i < mlen / 4; i++)
maskedaddr[i] &= imask[i];
mp = map;
while (len > mlen) {
match = bcmp(maskedaddr, mp, mlen);
mp += mlen / 4;
len -= mlen;
/*
* We must read "#interrupt-cells" for each time because
* interrupt-parent may be defferent.
*
* XXX assume #address-cells == 1
*/
iparent = *mp++;
len -= 4;
if (OF_getprop(iparent, "#interrupt-cells", &icells, 4) != 4)
return -1;
/* Found. */
if (match == 0) {
bcopy(mp, intr, icells * 4);
return icells * 4;
}
mp += icells;
len -= icells * 4;
}
nomap:
/*
* If the node has no interrupt property and the parent is a
* pci-bridge, use parent's interrupt. This occurs on a PCI
* slot. (e.g. AHA-3940)
*/
bzero(name, sizeof(name));
OF_getprop(parent, "name", name, sizeof(name));
if (strcmp(name, "pci-bridge") == 0) {
len = OF_getprop(parent, "AAPL,interrupts", intr, 4) ;
if (len == 4)
return len;
}
/* XXX This may be wrong... */
len = OF_getprop(node, "interrupts", intr, 4) ;
if (len == 4)
return len;
return -1;
}