/* $NetBSD: pci_machdep.c,v 1.9 2001/05/15 14:48:58 lukem 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. */ #include #include #include #include #include #include #include #define _PREP_BUS_DMA_PRIVATE #include #include #include #include #include #include #include #define PCI_MODE1_ENABLE 0x80000000UL #define PCI_MODE1_ADDRESS_REG (PREP_BUS_SPACE_IO + 0xcf8) #define PCI_MODE1_DATA_REG (PREP_BUS_SPACE_IO + 0xcfc) #define o2i(off) ((off)/sizeof(pcireg_t)) /* * PCI doesn't have any special needs; just use the generic versions * of these functions. */ struct prep_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; int bus, device, maxndevs, function, nfunctions; int iq = 2; /* fixup ioaddr: 0x02000000~ */ int mq = 1; /* fixup memaddr: 0x01000000~ */ pc = pba->pba_pc; bus = pba->pba_bus; maxndevs = pci_bus_maxdevs(pba->pba_pc, pba->pba_bus); for (device = 0; device < maxndevs; device++) { pcitag_t tag; pcireg_t id, intr, bhlcr, csr, adr; int line; tag = pci_make_tag(pc, bus, device, 0); id = pci_conf_read(pc, tag, PCI_ID_REG); /* Invalid vendor ID value? */ if (PCI_VENDOR(id) == PCI_VENDOR_INVALID) continue; /* XXX Not invalid, but we've done this ~forever. */ if (PCI_VENDOR(id) == 0) continue; bhlcr = pci_conf_read(pc, tag, PCI_BHLC_REG); if (PCI_HDRTYPE_MULTIFN(bhlcr)) nfunctions = 8; else nfunctions = 1; for (function = 0; function < nfunctions; function++) { pcireg_t regs[256/sizeof(pcireg_t)]; pcireg_t mask; pcireg_t rval; int off; int memfound, iofound; tag = pci_make_tag(pc, bus, device, function); id = pci_conf_read(pc, tag, PCI_ID_REG); /* Invalid vendor ID value? */ if (PCI_VENDOR(id) == PCI_VENDOR_INVALID) continue; /* XXX Not invalid, but we've done this ~forever. */ if (PCI_VENDOR(id) == 0) continue; /* Enable io/mem */ memfound = 0; iofound = 0; for (off = 0; off < 256; off += sizeof(pcireg_t)) regs[o2i(off)] = pci_conf_read(pc, tag, off); /* is it a std device header? */ if (PCI_HDRTYPE_TYPE(regs[o2i(PCI_BHLC_REG)]) != 0) continue; for (off = PCI_MAPREG_START; off < PCI_MAPREG_END; off += sizeof(pcireg_t)) { rval = regs[o2i(off)]; if (rval != 0) { pci_conf_write(pc, tag, off, 0xffffffff); mask = pci_conf_read(pc, tag, off); pci_conf_write(pc, tag, off, rval); } else mask = 0; #ifdef DEBUG printf("\n"); printf("dev %d func %d ", device, function); printf("off %02x addr %08x mask %08x", off, rval, mask); #endif if (rval == 0) continue; /* find IO or MEM space */ if (PCI_MAPREG_TYPE(rval) == PCI_MAPREG_TYPE_MEM) memfound = 1; else iofound = 1; } if (memfound) { csr = pci_conf_read(pc, tag, PCI_COMMAND_STATUS_REG); csr |= PCI_COMMAND_MEM_ENABLE; pci_conf_write(pc, tag, PCI_COMMAND_STATUS_REG, csr); #ifdef DEBUG printf("\n"); printf("dev %d func %d: mem", device, function); #endif } if (iofound) { csr = pci_conf_read(pc, tag, PCI_COMMAND_STATUS_REG); csr |= PCI_COMMAND_IO_ENABLE; pci_conf_write(pc, tag, PCI_COMMAND_STATUS_REG, csr); #ifdef DEBUG printf("\n"); printf("dev %d func %d: io", device, function); #endif } /* Fixup insane address */ for (off = PCI_MAPREG_START; off < PCI_MAPREG_END; off += sizeof(pcireg_t)) { int need_fixup; need_fixup = 0; adr = pci_conf_read(pc, tag, off); if (adr > 0x10000000 || (adr < 0x1000 && adr != 0)) need_fixup = 1; if (need_fixup) { #ifdef DEBUG printf("\n"); printf("dev %d func %d %saddr %08x -> ", device, function, PCI_MAPREG_TYPE(adr) == PCI_MAPREG_TYPE_MEM ? "mem":"io", adr); #endif adr &= 0x00ffffff; adr |= 0x01000000 * (PCI_MAPREG_TYPE(adr) == PCI_MAPREG_TYPE_MEM ? mq++:iq++); #ifdef DEBUG printf("%08x", adr); #endif pci_conf_write(pc, tag, off, adr); } } /* Fixup intr */ #if 1 /* XXX: ibm_machdep : ppc830 depend */ switch (device) { case 12: case 18: case 22: line = 15; break; default: line = 0; break; } if (line) { intr = pci_conf_read(pc, tag, PCI_INTERRUPT_REG); pci_conf_write(pc, tag, PCI_INTERRUPT_REG, (intr & ~0xff) | line); } #endif } } } 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"); tag = PCI_MODE1_ENABLE | (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) & 0x7; return; } pcireg_t pci_conf_read(pc, tag, reg) pci_chipset_tag_t pc; pcitag_t tag; int reg; { pcireg_t data; out32rb(PCI_MODE1_ADDRESS_REG, tag | reg); data = in32rb(PCI_MODE1_DATA_REG); out32rb(PCI_MODE1_ADDRESS_REG, 0); return data; } void pci_conf_write(pc, tag, reg, data) pci_chipset_tag_t pc; pcitag_t tag; int reg; pcireg_t data; { out32rb(PCI_MODE1_ADDRESS_REG, tag | reg); out32rb(PCI_MODE1_DATA_REG, data); out32rb(PCI_MODE1_ADDRESS_REG, 0); } 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; } if (line == IRQ_SLAVE) { printf("pci_intr_map: changed line 2 to line 9\n"); line = 9; } } *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 || ih == IRQ_SLAVE) 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; } 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 || ih == IRQ_SLAVE) panic("pci_intr_establish: bogus handle 0x%x\n", ih); return isa_intr_establish(NULL, ih, IST_LEVEL, level, func, arg); } void pci_intr_disestablish(pc, cookie) pci_chipset_tag_t pc; void *cookie; { isa_intr_disestablish(NULL, cookie); }