/* $OpenBSD: pci.c,v 1.6 1997/01/24 19:34:15 niklas Exp $ */ /* $NetBSD: pci.c,v 1.26 1996/12/05 01:25:30 cgd Exp $ */ /* * Copyright (c) 1995, 1996 Christopher G. Demetriou. All rights reserved. * Copyright (c) 1994 Charles 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 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. */ /* * PCI bus autoconfiguration. */ #include #include #include #include #include int pcimatch __P((struct device *, void *, void *)); void pciattach __P((struct device *, struct device *, void *)); struct cfattach pci_ca = { sizeof(struct device), pcimatch, pciattach }; struct cfdriver pci_cd = { NULL, "pci", DV_DULL }; int pciprint __P((void *, const char *)); int pcisubmatch __P((struct device *, void *, void *)); /* * Callback so that ISA/EISA bridges can attach their child busses * after PCI configuration is done. * * This works because: * (1) there can be at most one ISA/EISA bridge per PCI bus, and * (2) any ISA/EISA bridges must be attached to primary PCI * busses (i.e. bus zero). * * That boils down to: there can only be one of these outstanding * at a time, it is cleared when configuring PCI bus 0 before any * subdevices have been found, and it is run after all subdevices * of PCI bus 0 have been found. * * This is needed because there are some (legacy) PCI devices which * can show up as ISA/EISA devices as well (the prime example of which * are VGA controllers). If you attach ISA from a PCI-ISA/EISA bridge, * and the bridge is seen before the video board is, the board can show * up as an ISA device, and that can (bogusly) complicate the PCI device's * attach code, or make the PCI device not be properly attached at all. */ static void (*pci_isa_bridge_callback) __P((void *)); static void *pci_isa_bridge_callback_arg; int pcimatch(parent, match, aux) struct device *parent; void *match, *aux; { struct cfdata *cf = match; struct pcibus_attach_args *pba = aux; if (strcmp(pba->pba_busname, cf->cf_driver->cd_name)) return (0); /* Check the locators */ if (cf->pcibuscf_bus != PCIBUS_UNK_BUS && cf->pcibuscf_bus != pba->pba_bus) return (0); /* sanity */ if (pba->pba_bus < 0 || pba->pba_bus > 255) return (0); /* * XXX check other (hardware?) indicators */ return 1; } void pciattach(parent, self, aux) struct device *parent, *self; void *aux; { struct pcibus_attach_args *pba = aux; bus_space_tag_t iot, memt; pci_chipset_tag_t pc; int bus, device, maxndevs, function, nfunctions; pci_attach_hook(parent, self, pba); printf("\n"); iot = pba->pba_iot; memt = pba->pba_memt; pc = pba->pba_pc; bus = pba->pba_bus; maxndevs = pci_bus_maxdevs(pc, bus); if (bus == 0) pci_isa_bridge_callback = NULL; for (device = 0; device < maxndevs; device++) { pcitag_t tag; pcireg_t id, class, intr, bhlcr; struct pci_attach_args pa; int pin; tag = pci_make_tag(pc, bus, device, 0); id = pci_conf_read(pc, tag, PCI_ID_REG); if (id == 0 || id == 0xffffffff) continue; bhlcr = pci_conf_read(pc, tag, PCI_BHLC_REG); nfunctions = PCI_HDRTYPE_MULTIFN(bhlcr) ? 8 : 1; for (function = 0; function < nfunctions; function++) { tag = pci_make_tag(pc, bus, device, function); id = pci_conf_read(pc, tag, PCI_ID_REG); if (id == 0 || id == 0xffffffff) continue; class = pci_conf_read(pc, tag, PCI_CLASS_REG); intr = pci_conf_read(pc, tag, PCI_INTERRUPT_REG); pa.pa_iot = iot; pa.pa_memt = memt; pa.pa_pc = pc; pa.pa_device = device; pa.pa_function = function; pa.pa_tag = tag; pa.pa_id = id; pa.pa_class = class; if (bus == 0) { pa.pa_intrswiz = 0; pa.pa_intrtag = tag; } else { pa.pa_intrswiz = pba->pba_intrswiz + device; pa.pa_intrtag = pba->pba_intrtag; } pin = PCI_INTERRUPT_PIN(intr); if (pin == PCI_INTERRUPT_PIN_NONE) { /* no interrupt */ pa.pa_intrpin = 0; } else { /* * swizzle it based on the number of * busses we're behind and our device * number. */ pa.pa_intrpin = /* XXX */ ((pin + pa.pa_intrswiz - 1) % 4) + 1; } pa.pa_intrline = PCI_INTERRUPT_LINE(intr); config_found_sm(self, &pa, pciprint, pcisubmatch); } } if (bus == 0 && pci_isa_bridge_callback != NULL) (*pci_isa_bridge_callback)(pci_isa_bridge_callback_arg); } int pciprint(aux, pnp) void *aux; const char *pnp; { register struct pci_attach_args *pa = aux; char devinfo[256]; if (pnp) { pci_devinfo(pa->pa_id, pa->pa_class, 1, devinfo); printf("%s at %s", devinfo, pnp); } printf(" dev %d function %d", pa->pa_device, pa->pa_function); return (UNCONF); } int pcisubmatch(parent, match, aux) struct device *parent; void *match, *aux; { struct cfdata *cf = match; struct pci_attach_args *pa = aux; if (cf->pcicf_dev != PCI_UNK_DEV && cf->pcicf_dev != pa->pa_device) return 0; if (cf->pcicf_function != PCI_UNK_FUNCTION && cf->pcicf_function != pa->pa_function) return 0; return ((*cf->cf_attach->ca_match)(parent, match, aux)); } int pci_io_find(pc, pcitag, reg, iobasep, iosizep) pci_chipset_tag_t pc; pcitag_t pcitag; int reg; bus_addr_t *iobasep; bus_size_t *iosizep; { pcireg_t addrdata, sizedata; int s; if (reg < PCI_MAPREG_START || reg >= PCI_MAPREG_END || (reg & 3)) panic("pci_io_find: bad request"); /* XXX? * Section 6.2.5.1, `Address Maps', tells us that: * * 1) The builtin software should have already mapped the device in a * reasonable way. * * 2) A device which wants 2^n bytes of memory will hardwire the bottom * n bits of the address to 0. As recommended, we write all 1s and see * what we get back. */ addrdata = pci_conf_read(pc, pcitag, reg); s = splhigh(); pci_conf_write(pc, pcitag, reg, 0xffffffff); sizedata = pci_conf_read(pc, pcitag, reg); pci_conf_write(pc, pcitag, reg, addrdata); splx(s); if (PCI_MAPREG_TYPE(addrdata) != PCI_MAPREG_TYPE_IO) panic("pci_io_find: not an I/O region"); if (iobasep != NULL) *iobasep = PCI_MAPREG_IO_ADDR(addrdata); if (iosizep != NULL) *iosizep = PCI_MAPREG_IO_SIZE(sizedata); return (0); } int pci_mem_find(pc, pcitag, reg, membasep, memsizep, cacheablep) pci_chipset_tag_t pc; pcitag_t pcitag; int reg; bus_addr_t *membasep; bus_size_t *memsizep; int *cacheablep; { pcireg_t addrdata, sizedata; int s; if (reg < PCI_MAPREG_START || reg >= PCI_MAPREG_END || (reg & 3)) panic("pci_find_mem: bad request"); /* * Section 6.2.5.1, `Address Maps', tells us that: * * 1) The builtin software should have already mapped the device in a * reasonable way. * * 2) A device which wants 2^n bytes of memory will hardwire the bottom * n bits of the address to 0. As recommended, we write all 1s and see * what we get back. */ addrdata = pci_conf_read(pc, pcitag, reg); s = splhigh(); pci_conf_write(pc, pcitag, reg, 0xffffffff); sizedata = pci_conf_read(pc, pcitag, reg); pci_conf_write(pc, pcitag, reg, addrdata); splx(s); if (PCI_MAPREG_TYPE(addrdata) == PCI_MAPREG_TYPE_IO) panic("pci_find_mem: I/O region"); switch (PCI_MAPREG_MEM_TYPE(addrdata)) { case PCI_MAPREG_MEM_TYPE_32BIT: case PCI_MAPREG_MEM_TYPE_32BIT_1M: break; case PCI_MAPREG_MEM_TYPE_64BIT: /* XXX */ printf("pci_find_mem: 64-bit region\n"); /* XXX */ return (1); default: printf("pci_find_mem: reserved region type\n"); return (1); } if (membasep != NULL) *membasep = PCI_MAPREG_MEM_ADDR(addrdata); /* PCI addr */ if (memsizep != NULL) *memsizep = PCI_MAPREG_MEM_SIZE(sizedata); if (cacheablep != NULL) *cacheablep = PCI_MAPREG_MEM_CACHEABLE(addrdata); return 0; } void set_pci_isa_bridge_callback(fn, arg) void (*fn) __P((void *)); void *arg; { if (pci_isa_bridge_callback != NULL) panic("set_pci_isa_bridge_callback"); pci_isa_bridge_callback = fn; pci_isa_bridge_callback_arg = arg; }