/*
* 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'.
*/
/*
* first hack - here we make the Ethernet portion of a
* UMAX E100 card work
*/
#ifdef UMAX_E100_HACK
tag = pci_make_tag(pc, 0, 17, 0);
id = pci_conf_read(pc, tag, PCI_ID_REG);
if ((PCI_VENDOR(id) == PCI_VENDOR_DEC) &&
(PCI_PRODUCT(id) == PCI_PRODUCT_DEC_21140)) {
/* this could be one */
pcireg_t isp, reg;
pcitag_t tag_isp = pci_make_tag(pc, 0, 13, 0);
/*
* here we go. We shouldn't encounter this anywhere else
* than on a UMAX S900 with an E100 board
* look at 00:0d:00 for a Qlogic ISP 1020 to
* make sure we really have an E100 here
*/
aprint_debug("\nfound E100 candidate tlp");
isp = pci_conf_read(pc, tag_isp, PCI_ID_REG);
if ((PCI_VENDOR(isp) == PCI_VENDOR_QLOGIC) &&
(PCI_PRODUCT(isp) == PCI_PRODUCT_QLOGIC_ISP1020)) {
len = OF_getprop(parent, "#interrupt-cells", &ilen, sizeof(ilen));
if (len < 0)
ilen = 0;
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:
case OFW_PCI_PHYS_HI_SPACE_MEM64:
csr |= PCI_COMMAND_MEM_ENABLE;
break;
}
}
/*
* Make sure the line register is programmed with the
* interrupt mapping.
*/
if (ilen == 0) {
/*
* Early Apple OFW implementation don't handle
* interrupts as defined by the OFW PCI bindings.
*/
len = OF_getprop(node, "AAPL,interrupts", irqs, 4);
} else {
iaddr.phys_hi = addr[0].phys_hi;
iaddr.phys_mid = addr[0].phys_mid;
iaddr.phys_lo = addr[0].phys_lo;
/*
* Thankfully, PCI can only have one entry in its
* "interrupts" property.
*/
len = OF_getprop(node, "interrupts", &iaddr.icells[0],
4*ilen);
if (len != 4*ilen)
continue;
len = find_node_intr(node, &iaddr.phys_hi, irqs);
}
if (len <= 0) {
/*
* If we still don't have an interrupt, try one
* more time. This case covers devices behind the
* PCI-PCI bridge in a UMAX S900 or similar (9500?)
* system. These slots all share the bridge's
* interrupt.
*/
len = find_node_intr(node, &addr[0].phys_hi, irqs);
if (len <= 0)
continue;
}
/*
* For PowerBook 2400, 3400 and original G3:
* check if we have a 2nd ohare PIC - if so frob the built-in
* tlp's IRQ to 60
* first see if we have something on bus 0 device 13 and if
* it's a DEC 21041
*/
id = pci_conf_read(pc, tag, PCI_ID_REG);
if ((tag == pci_make_tag(pc, 0, 13, 0)) &&
(PCI_VENDOR(id) == PCI_VENDOR_DEC) &&
(PCI_PRODUCT(id) == PCI_PRODUCT_DEC_21041)) {
/* now look for the 2nd ohare */
if (OF_finddevice("/bandit/pci106b,7") != -1) {
/* fix secondary bus numbers on CardBus bridges */
cr = pci_conf_read(pc, tag, PCI_CLASS_REG);
if ((PCI_CLASS(cr) == PCI_CLASS_BRIDGE) &&
(PCI_SUBCLASS(cr) == PCI_SUBCLASS_BRIDGE_CARDBUS)) {
uint32_t bi, busid;
/*
* we found a CardBus bridge. Check if the bus number
* is sane
*/
bi = pci_conf_read(pc, tag, PCI_BRIDGE_BUS_REG);
busid = bi & 0xff;
if (busid == 0) {
fix_cardbus_bridge(node, pc, tag);
}
}
}
}
len = OF_package_to_path(node, path, sizeof(path));
path[len] = 0;
aprint_verbose("\n%s: fixing bus number to %d", path, bus_number);
pci_decompose_tag(pc, tag, &bus, &dev, &fn);
bi = pci_conf_read(pc, tag, PCI_BRIDGE_BUS_REG);
bi &= 0xff000000;
/* XXX subordinate is always 32 here */
bi |= (bus & 0xff) | (bus_number << 8) | 0x200000;
pci_conf_write(pc, tag, PCI_BRIDGE_BUS_REG, bi);
}
}
/*
* Find PCI IRQ of the node from OF tree.
*/
static int
find_node_intr(int node, u_int32_t *addr, uint32_t *intr)
{
int parent, len, mlen, iparent;
int match, i;
u_int32_t map[160];
const u_int32_t *mp;
u_int32_t imapmask[8], maskedaddr[8];
u_int32_t acells, icells;
char name[32];
/* XXXSL: 1st check for a interrupt-parent property */
if (OF_getprop(node, "interrupt-parent", &iparent, sizeof(iparent)) == sizeof(iparent))
{
/* How many cells to specify an interrupt ?? */
if (OF_getprop(iparent, "#interrupt-cells", &icells, 4) != 4)
return -1;
if (mlen != -1)
memcpy(maskedaddr, addr, mlen);
again:
if (len == -1 || mlen == -1)
goto nomap;
#ifdef DIAGNOSTIC
if (mlen == sizeof(imapmask)) {
aprint_error("interrupt-map too long\n");
return -1;
}
#endif
/* mask addr by "interrupt-map-mask" */
for (i = 0; i < mlen / 4; i++)
maskedaddr[i] &= imapmask[i];
mp = map;
i = 0;
while (len > mlen) {
match = memcmp(maskedaddr, mp, mlen);
mp += mlen / 4;
len -= mlen;
/*
* We must read "#address-cells" and "#interrupt-cells" each
* time because each interrupt-parent may be different.
*/
iparent = *mp++;
len -= 4;
i = OF_getprop(iparent, "#address-cells", &acells, 4);
if (i <= 0)
acells = 0;
else if (i != 4)
return -1;
if (OF_getprop(iparent, "#interrupt-cells", &icells, 4) != 4)
return -1;
/* Found. */
if (match == 0) {
/*
* We matched on address/interrupt, but are we done?
*/
if (acells == 0) { /* XXX */
/*
* If we are at the interrupt controller,
* we are finally done. Save the result and
* return.
*/
memcpy(intr, mp, icells * 4);
return icells * 4;
}
/*
* We are now at an intermedia interrupt node. We
* need to use its interrupt mask and map the
* supplied address/interrupt via its map.
*/
mlen = OF_getprop(iparent, "interrupt-map-mask",
imapmask, sizeof(imapmask));
#ifdef DIAGNOSTIC
if (mlen != (acells + icells)*4) {
aprint_error("interrupt-map inconsistent (%d, %d)\n",
mlen, (acells + icells)*4);
return -1;
}
#endif
memcpy(maskedaddr, mp, mlen);
len = OF_getprop(iparent, "interrupt-map", map,
sizeof(map));
goto again;
}
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)
*/
memset(name, 0, 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;
#if 0
/*
* XXX I don't know what is the correct local address.
* XXX Use the first entry for now.
*/
len = OF_getprop(parent, "interrupt-map", map, sizeof(map));
if (len >= 36) {
addr = &map[5];
return find_node_intr(parent, addr, intr);
}
#endif
}
/*
* If all else fails, attempt to get AAPL, interrupts property.
* Grackle, at least, uses this instead of above in some cases.
*/
len = OF_getprop(node, "AAPL,interrupts", intr, 4) ;
if (len == 4)
return len;
