/* $NetBSD: pci_machdep.c,v 1.27 2004/12/07 15:42:08 briggs 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 __KERNEL_RCSID(0, "$NetBSD: pci_machdep.c,v 1.27 2004/12/07 15:42:08 briggs Exp $"); #include #include #include #include #include #include #include #define _MACPPC_BUS_DMA_PRIVATE #include #include #include #include #include #include #include #include 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(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 == 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", 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 (ih == 0 || ih >= ICU_LEN) panic("pci_intr_establish: bogus handle 0x%x", 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, ilen; int32_t irqs[4]; struct { u_int32_t phys_hi, phys_mid, phys_lo; u_int32_t size_hi, size_lo; } addr[8]; struct { u_int32_t phys_hi, phys_mid, phys_lo; u_int32_t icells[5]; } iaddr; 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; } } pci_conf_write(pc, tag, PCI_COMMAND_STATUS_REG, csr); /* * 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; } 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[160]; const u_int32_t *mp; u_int32_t imask[8], maskedaddr[8]; u_int32_t acells, icells; char name[32]; parent = OF_parent(node); len = OF_getprop(parent, "interrupt-map", map, sizeof(map)); mlen = OF_getprop(parent, "interrupt-map-mask", imask, sizeof(imask)); if (mlen != -1) memcpy(maskedaddr, addr, mlen); again: 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" */ for (i = 0; i < mlen / 4; i++) maskedaddr[i] &= imask[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", imask, sizeof(imask)); #ifdef DIAGNOSTIC if (mlen != (acells + icells)*4) { printf("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; } mp += (acells + icells); len -= (acells + 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) */ 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; return -1; }