/* * Copyright (c) 1997, Stefan Esser * Copyright (c) 2000, Michael Smith * Copyright (c) 2000, BSDi * 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 unmodified, 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. * * 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. * * $FreeBSD: src/sys/i386/isa/pci_cfgreg.c,v 1.1.2.7 2001/11/28 05:47:03 imp Exp $ * */ #include /* XXX trim includes */ #include #include #include #include #include #include #include #include #include #include #include #include /* #include */ #include #include #include #ifdef APIC_IO #include #endif /* APIC_IO */ static int cfgmech; static int devmax; #define PRVERB(a) printf a static int pci_cfgintr_unique(struct PIR_entry *pe, int pin); static int pci_cfgintr_linked(struct PIR_entry *pe, int pin); static int pci_cfgintr_search(struct PIR_entry *pe, int bus, int device, int matchpin, int pin); static int pci_cfgintr_virgin(struct PIR_entry *pe, int pin); static int pcireg_cfgread(int bus, int slot, int func, int reg, int bytes); static void pcireg_cfgwrite(int bus, int slot, int func, int reg, int data, int bytes); static int pcireg_cfgopen(void); static struct PIR_table *pci_route_table; static int pci_route_count; static u_int16_t pcibios_get_version(void) { struct bios_regs args; if (PCIbios.entry == 0) { PRVERB(("pcibios: No call entry point\n")); return (0); } args.eax = PCIBIOS_BIOS_PRESENT; if (bios32(&args, PCIbios.ventry, GSEL(GCODE_SEL, SEL_KPL))) { PRVERB(("pcibios: BIOS_PRESENT call failed\n")); return (0); } if (args.edx != 0x20494350) { PRVERB(("pcibios: BIOS_PRESENT didn't return 'PCI ' in edx\n")); return (0); } return (args.ebx & 0xffff); } /* * Initialise access to PCI configuration space */ int pci_cfgregopen(void) { static int opened = 0; u_long sigaddr; static struct PIR_table *pt; u_int8_t ck, *cv; int i; if (opened) return(1); if (pcireg_cfgopen() == 0) return(0); /* * Look for the interrupt routing table. */ /* We use PCI BIOS's PIR table if it's available */ if (pcibios_get_version() >= 0x0210 && pt == NULL && (sigaddr = bios_sigsearch(0, "$PIR", 4, 16, 0)) != 0) { pt = (struct PIR_table *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr); for (cv = (u_int8_t *)pt, ck = 0, i = 0; i < (pt->pt_header.ph_length); i++) { ck += cv[i]; } if (ck == 0) { pci_route_table = pt; pci_route_count = (pt->pt_header.ph_length - sizeof(struct PIR_header)) / sizeof(struct PIR_entry); printf("Using $PIR table, %d entries at %p\n", pci_route_count, pci_route_table); } } opened = 1; return(1); } /* * Read configuration space register */ static u_int32_t pci_do_cfgregread(int bus, int slot, int func, int reg, int bytes) { return(pcireg_cfgread(bus, slot, func, reg, bytes)); } u_int32_t pci_cfgregread(int bus, int slot, int func, int reg, int bytes) { #ifdef APIC_IO /* * If we are using the APIC, the contents of the intline register will probably * be wrong (since they are set up for use with the PIC. * Rather than rewrite these registers (maybe that would be smarter) we trap * attempts to read them and translate to our private vector numbers. */ if ((reg == PCIR_INTLINE) && (bytes == 1)) { int pin, line; pin = pci_do_cfgregread(bus, slot, func, PCIR_INTPIN, 1); line = pci_do_cfgregread(bus, slot, func, PCIR_INTLINE, 1); if (pin != 0) { int airq; airq = pci_apic_irq(bus, slot, pin); if (airq >= 0) { /* PCI specific entry found in MP table */ if (airq != line) undirect_pci_irq(line); return(airq); } else { /* * PCI interrupts might be redirected to the * ISA bus according to some MP tables. Use the * same methods as used by the ISA devices * devices to find the proper IOAPIC int pin. */ airq = isa_apic_irq(line); if ((airq >= 0) && (airq != line)) { /* XXX: undirect_pci_irq() ? */ undirect_isa_irq(line); return(airq); } } } return(line); } #endif /* APIC_IO */ return(pci_do_cfgregread(bus, slot, func, reg, bytes)); } /* * Write configuration space register */ void pci_cfgregwrite(int bus, int slot, int func, int reg, u_int32_t data, int bytes) { return(pcireg_cfgwrite(bus, slot, func, reg, data, bytes)); } int pci_cfgread(pcicfgregs *cfg, int reg, int bytes) { return(pci_cfgregread(cfg->bus, cfg->slot, cfg->func, reg, bytes)); } void pci_cfgwrite(pcicfgregs *cfg, int reg, int data, int bytes) { pci_cfgregwrite(cfg->bus, cfg->slot, cfg->func, reg, data, bytes); } /* * Route a PCI interrupt * * XXX we don't do anything "right" with the function number in the PIR table * (because the consumer isn't currently passing it in). We don't care * anyway, due to the way PCI interrupts are assigned. */ int pci_cfgintr(int bus, int device, int pin) { struct PIR_entry *pe; int i, irq; struct bios_regs args; u_int16_t v; int already = 0; v = pcibios_get_version(); if (v < 0x0210) { PRVERB(( "pci_cfgintr: BIOS %x.%02x doesn't support interrupt routing\n", (v & 0xff00) >> 8, v & 0xff)); return (255); } if ((bus < 0) || (bus > 255) || (device < 0) || (device > 255) || (pin < 1) || (pin > 4)) return(255); /* * Scan the entry table for a contender */ for (i = 0, pe = &pci_route_table->pt_entry[0]; i < pci_route_count; i++, pe++) { if ((bus != pe->pe_bus) || (device != pe->pe_device)) continue; irq = pci_cfgintr_linked(pe, pin); if (irq != 255) already = 1; if (irq == 255) irq = pci_cfgintr_unique(pe, pin); if (irq == 255) irq = pci_cfgintr_virgin(pe, pin); if (irq == 255) break; /* * Ask the BIOS to route the interrupt */ args.eax = PCIBIOS_ROUTE_INTERRUPT; args.ebx = (bus << 8) | (device << 3); args.ecx = (irq << 8) | (0xa + pin - 1); /* pin value is 0xa - 0xd */ if (bios32(&args, PCIbios.ventry, GSEL(GCODE_SEL, SEL_KPL)) && !already) { /* * XXX if it fails, we should try to smack the router * hardware directly. * XXX Also, there may be other choices that we can try that * will work. */ PRVERB(("pci_cfgintr: ROUTE_INTERRUPT failed.\n")); return(255); } printf("pci_cfgintr: %d:%d INT%c routed to irq %d\n", bus, device, 'A' + pin - 1, irq); return(irq); } PRVERB(("pci_cfgintr: can't route an interrupt to %d:%d INT%c\n", bus, device, 'A' + pin - 1)); return(255); } /* * Look to see if the routing table claims this pin is uniquely routed. */ static int pci_cfgintr_unique(struct PIR_entry *pe, int pin) { int irq; if (powerof2(pe->pe_intpin[pin - 1].irqs)) { irq = ffs(pe->pe_intpin[pin - 1].irqs) - 1; PRVERB(("pci_cfgintr_unique: hard-routed to irq %d\n", irq)); return(irq); } return(255); } /* * Look for another device which shares the same link byte and * already has a unique IRQ, or which has had one routed already. */ static int pci_cfgintr_linked(struct PIR_entry *pe, int pin) { struct PIR_entry *oe; struct PIR_intpin *pi; int i, j, irq; /* * Scan table slots. */ for (i = 0, oe = &pci_route_table->pt_entry[0]; i < pci_route_count; i++, oe++) { /* scan interrupt pins */ for (j = 0, pi = &oe->pe_intpin[0]; j < 4; j++, pi++) { /* don't look at the entry we're trying to match with */ if ((pe == oe) && (i == (pin - 1))) continue; /* compare link bytes */ if (pi->link != pe->pe_intpin[pin - 1].link) continue; /* link destination mapped to a unique interrupt? */ if (powerof2(pi->irqs)) { irq = ffs(pi->irqs) - 1; PRVERB(("pci_cfgintr_linked: linked (%x) to hard-routed irq %d\n", pi->link, irq)); return(irq); } /* look for the real PCI device that matches this table entry */ if ((irq = pci_cfgintr_search(pe, oe->pe_bus, oe->pe_device, j, pin)) != 255) return(irq); } } return(255); } /* * Scan for the real PCI device at (bus)/(device) using intpin (matchpin) and * see if it has already been assigned an interrupt. */ static int pci_cfgintr_search(struct PIR_entry *pe, int bus, int device, int matchpin, int pin) { devclass_t pci_devclass; device_t *pci_devices; int pci_count; device_t *pci_children; int pci_childcount; device_t *busp, *childp; int i, j, irq; /* * Find all the PCI busses. */ pci_count = 0; if ((pci_devclass = devclass_find("pci")) != NULL) devclass_get_devices(pci_devclass, &pci_devices, &pci_count); /* * Scan all the PCI busses/devices looking for this one. */ irq = 255; for (i = 0, busp = pci_devices; (i < pci_count) && (irq == 255); i++, busp++) { pci_childcount = 0; device_get_children(*busp, &pci_children, &pci_childcount); for (j = 0, childp = pci_children; j < pci_childcount; j++, childp++) { if ((pci_get_bus(*childp) == bus) && (pci_get_slot(*childp) == device) && (pci_get_intpin(*childp) == matchpin)) { irq = pci_get_irq(*childp); /* * Some BIOS writers seem to want to ignore the spec and put * 0 in the intline rather than 255 to indicate none. Once * we've found one that matches, we break because there can * be no others (which is why test looks a little odd). */ if (irq == 0) irq = 255; if (irq != 255) PRVERB(("pci_cfgintr_search: linked (%x) to configured irq %d at %d:%d:%d\n", pe->pe_intpin[pin - 1].link, irq, pci_get_bus(*childp), pci_get_slot(*childp), pci_get_function(*childp))); break; } } if (pci_children != NULL) free(pci_children, M_TEMP); } if (pci_devices != NULL) free(pci_devices, M_TEMP); return(irq); } /* * Pick a suitable IRQ from those listed as routable to this device. */ static int pci_cfgintr_virgin(struct PIR_entry *pe, int pin) { int irq, ibit; /* first scan the set of PCI-only interrupts and see if any of these are routable */ for (irq = 0; irq < 16; irq++) { ibit = (1 << irq); /* can we use this interrupt? */ if ((pci_route_table->pt_header.ph_pci_irqs & ibit) && (pe->pe_intpin[pin - 1].irqs & ibit)) { PRVERB(("pci_cfgintr_virgin: using routable PCI-only interrupt %d\n", irq)); return(irq); } } /* life is tough, so just pick an interrupt */ for (irq = 0; irq < 16; irq++) { ibit = (1 << irq); if (pe->pe_intpin[pin - 1].irqs & ibit) { PRVERB(("pci_cfgintr_virgin: using routable interrupt %d\n", irq)); return(irq); } } return(255); } /* * Configuration space access using direct register operations */ /* enable configuration space accesses and return data port address */ static int pci_cfgenable(unsigned bus, unsigned slot, unsigned func, int reg, int bytes) { int dataport = 0; if (bus <= PCI_BUSMAX && slot < devmax && func <= PCI_FUNCMAX && reg <= PCI_REGMAX && bytes != 3 && (unsigned) bytes <= 4 && (reg & (bytes -1)) == 0) { switch (cfgmech) { case 1: outl(CONF1_ADDR_PORT, (1 << 31) | (bus << 16) | (slot << 11) | (func << 8) | (reg & ~0x03)); dataport = CONF1_DATA_PORT + (reg & 0x03); break; case 2: outb(CONF2_ENABLE_PORT, 0xf0 | (func << 1)); outb(CONF2_FORWARD_PORT, bus); dataport = 0xc000 | (slot << 8) | reg; break; } } return (dataport); } /* disable configuration space accesses */ static void pci_cfgdisable(void) { switch (cfgmech) { case 1: outl(CONF1_ADDR_PORT, 0); break; case 2: outb(CONF2_ENABLE_PORT, 0); outb(CONF2_FORWARD_PORT, 0); break; } } static int pcireg_cfgread(int bus, int slot, int func, int reg, int bytes) { int data = -1; int port; port = pci_cfgenable(bus, slot, func, reg, bytes); if (port != 0) { switch (bytes) { case 1: data = inb(port); break; case 2: data = inw(port); break; case 4: data = inl(port); break; } pci_cfgdisable(); } return (data); } static void pcireg_cfgwrite(int bus, int slot, int func, int reg, int data, int bytes) { int port; port = pci_cfgenable(bus, slot, func, reg, bytes); if (port != 0) { switch (bytes) { case 1: outb(port, data); break; case 2: outw(port, data); break; case 4: outl(port, data); break; } pci_cfgdisable(); } } /* check whether the configuration mechanism has been correctly identified */ static int pci_cfgcheck(int maxdev) { u_char device; if (bootverbose) printf("pci_cfgcheck:\tdevice "); for (device = 0; device < maxdev; device++) { unsigned id, class, header; if (bootverbose) printf("%d ", device); id = inl(pci_cfgenable(0, device, 0, 0, 4)); if (id == 0 || id == -1) continue; class = inl(pci_cfgenable(0, device, 0, 8, 4)) >> 8; if (bootverbose) printf("[class=%06x] ", class); if (class == 0 || (class & 0xf870ff) != 0) continue; header = inb(pci_cfgenable(0, device, 0, 14, 1)); if (bootverbose) printf("[hdr=%02x] ", header); if ((header & 0x7e) != 0) continue; if (bootverbose) printf("is there (id=%08x)\n", id); pci_cfgdisable(); return (1); } if (bootverbose) printf("-- nothing found\n"); pci_cfgdisable(); return (0); } static int pcireg_cfgopen(void) { unsigned long mode1res,oldval1; unsigned char mode2res,oldval2; oldval1 = inl(CONF1_ADDR_PORT); if (bootverbose) { printf("pci_open(1):\tmode 1 addr port (0x0cf8) is 0x%08lx\n", oldval1); } if ((oldval1 & CONF1_ENABLE_MSK) == 0) { cfgmech = 1; devmax = 32; outl(CONF1_ADDR_PORT, CONF1_ENABLE_CHK); outb(CONF1_ADDR_PORT +3, 0); mode1res = inl(CONF1_ADDR_PORT); outl(CONF1_ADDR_PORT, oldval1); if (bootverbose) printf("pci_open(1a):\tmode1res=0x%08lx (0x%08lx)\n", mode1res, CONF1_ENABLE_CHK); if (mode1res) { if (pci_cfgcheck(32)) return (cfgmech); } outl(CONF1_ADDR_PORT, CONF1_ENABLE_CHK1); mode1res = inl(CONF1_ADDR_PORT); outl(CONF1_ADDR_PORT, oldval1); if (bootverbose) printf("pci_open(1b):\tmode1res=0x%08lx (0x%08lx)\n", mode1res, CONF1_ENABLE_CHK1); if ((mode1res & CONF1_ENABLE_MSK1) == CONF1_ENABLE_RES1) { if (pci_cfgcheck(32)) return (cfgmech); } } oldval2 = inb(CONF2_ENABLE_PORT); if (bootverbose) { printf("pci_open(2):\tmode 2 enable port (0x0cf8) is 0x%02x\n", oldval2); } if ((oldval2 & 0xf0) == 0) { cfgmech = 2; devmax = 16; outb(CONF2_ENABLE_PORT, CONF2_ENABLE_CHK); mode2res = inb(CONF2_ENABLE_PORT); outb(CONF2_ENABLE_PORT, oldval2); if (bootverbose) printf("pci_open(2a):\tmode2res=0x%02x (0x%02x)\n", mode2res, CONF2_ENABLE_CHK); if (mode2res == CONF2_ENABLE_RES) { if (bootverbose) printf("pci_open(2a):\tnow trying mechanism 2\n"); if (pci_cfgcheck(16)) return (cfgmech); } } cfgmech = 0; devmax = 0; return (cfgmech); }