/* $OpenBSD: pci_machdep.c,v 1.22 2001/11/06 19:53:14 miod Exp $ */ /* $NetBSD: pci_machdep.c,v 1.28 1997/06/06 23:29:17 thorpej Exp $ */ /*- * Copyright (c) 1997 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, * NASA Ames Research Center. * * 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 the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``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 FOUNDATION OR CONTRIBUTORS * 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. */ /* * Copyright (c) 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. */ /* * 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 #include #include #include #include #include #include #define _I386_BUS_DMA_PRIVATE #include #include #include "bios.h" #if NBIOS > 0 #include extern bios_pciinfo_t *bios_pciinfo; #endif #include #include #include #include #include "pcibios.h" #if NPCIBIOS > 0 #include #endif int pci_mode = -1; #define PCI_MODE1_ENABLE 0x80000000UL #define PCI_MODE1_ADDRESS_REG 0x0cf8 #define PCI_MODE1_DATA_REG 0x0cfc #define PCI_MODE2_ENABLE_REG 0x0cf8 #define PCI_MODE2_FORWARD_REG 0x0cfa /* * PCI doesn't have any special needs; just use the generic versions * of these functions. */ struct i386_bus_dma_tag pci_bus_dma_tag = { NULL, /* _cookie */ _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; { #if NBIOS > 0 if (pba->pba_bus == 0) printf(": configuration mode %d (%s)", pci_mode, (bios_pciinfo?"bios":"no bios")); #else if (pba->pba_bus == 0) printf(": configuration mode %d", pci_mode); #endif } int pci_bus_maxdevs(pc, busno) pci_chipset_tag_t pc; int busno; { /* * Bus number is irrelevant. If Configuration Mechanism 2 is in * use, can only have devices 0-15 on any bus. If Configuration * Mechanism 1 is in use, can have devices 0-32 (i.e. the `normal' * range). */ if (pci_mode == 2) return (16); else return (32); } pcitag_t pci_make_tag(pc, bus, device, function) pci_chipset_tag_t pc; int bus, device, function; { pcitag_t tag; #ifndef PCI_CONF_MODE switch (pci_mode) { case 1: goto mode1; case 2: goto mode2; default: panic("pci_make_tag: mode not configured"); } #endif #if !defined(PCI_CONF_MODE) || (PCI_CONF_MODE == 1) #ifndef PCI_CONF_MODE mode1: #endif if (bus >= 256 || device >= 32 || function >= 8) panic("pci_make_tag: bad request"); tag.mode1 = PCI_MODE1_ENABLE | (bus << 16) | (device << 11) | (function << 8); return tag; #endif #if !defined(PCI_CONF_MODE) || (PCI_CONF_MODE == 2) #ifndef PCI_CONF_MODE mode2: #endif if (bus >= 256 || device >= 16 || function >= 8) panic("pci_make_tag: bad request"); tag.mode2.port = 0xc000 | (device << 8); tag.mode2.enable = 0xf0 | (function << 1); tag.mode2.forward = bus; return tag; #endif } void pci_decompose_tag(pc, tag, bp, dp, fp) pci_chipset_tag_t pc; pcitag_t tag; int *bp, *dp, *fp; { #ifndef PCI_CONF_MODE switch (pci_mode) { case 1: goto mode1; case 2: goto mode2; default: panic("pci_decompose_tag: mode not configured"); } #endif #if !defined(PCI_CONF_MODE) || (PCI_CONF_MODE == 1) #ifndef PCI_CONF_MODE mode1: #endif if (bp != NULL) *bp = (tag.mode1 >> 16) & 0xff; if (dp != NULL) *dp = (tag.mode1 >> 11) & 0x1f; if (fp != NULL) *fp = (tag.mode1 >> 8) & 0x7; return; #endif #if !defined(PCI_CONF_MODE) || (PCI_CONF_MODE == 2) #ifndef PCI_CONF_MODE mode2: #endif if (bp != NULL) *bp = tag.mode2.forward & 0xff; if (dp != NULL) *dp = (tag.mode2.port >> 8) & 0xf; if (fp != NULL) *fp = (tag.mode2.enable >> 1) & 0x7; #endif } pcireg_t pci_conf_read(pc, tag, reg) pci_chipset_tag_t pc; pcitag_t tag; int reg; { pcireg_t data; #ifndef PCI_CONF_MODE switch (pci_mode) { case 1: goto mode1; case 2: goto mode2; default: panic("pci_conf_read: mode not configured"); } #endif #if !defined(PCI_CONF_MODE) || (PCI_CONF_MODE == 1) #ifndef PCI_CONF_MODE mode1: #endif outl(PCI_MODE1_ADDRESS_REG, tag.mode1 | reg); data = inl(PCI_MODE1_DATA_REG); outl(PCI_MODE1_ADDRESS_REG, 0); return data; #endif #if !defined(PCI_CONF_MODE) || (PCI_CONF_MODE == 2) #ifndef PCI_CONF_MODE mode2: #endif outb(PCI_MODE2_ENABLE_REG, tag.mode2.enable); outb(PCI_MODE2_FORWARD_REG, tag.mode2.forward); data = inl(tag.mode2.port | reg); outb(PCI_MODE2_ENABLE_REG, 0); return data; #endif } void pci_conf_write(pc, tag, reg, data) pci_chipset_tag_t pc; pcitag_t tag; int reg; pcireg_t data; { #ifndef PCI_CONF_MODE switch (pci_mode) { case 1: goto mode1; case 2: goto mode2; default: panic("pci_conf_write: mode not configured"); } #endif #if !defined(PCI_CONF_MODE) || (PCI_CONF_MODE == 1) #ifndef PCI_CONF_MODE mode1: #endif outl(PCI_MODE1_ADDRESS_REG, tag.mode1 | reg); outl(PCI_MODE1_DATA_REG, data); outl(PCI_MODE1_ADDRESS_REG, 0); return; #endif #if !defined(PCI_CONF_MODE) || (PCI_CONF_MODE == 2) #ifndef PCI_CONF_MODE mode2: #endif outb(PCI_MODE2_ENABLE_REG, tag.mode2.enable); outb(PCI_MODE2_FORWARD_REG, tag.mode2.forward); outl(tag.mode2.port | reg, data); outb(PCI_MODE2_ENABLE_REG, 0); #endif } int pci_mode_detect() { #ifdef PCI_CONF_MODE #if (PCI_CONF_MODE == 1) || (PCI_CONF_MODE == 2) return (pci_mode = PCI_CONF_MODE); #else #error Invalid PCI configuration mode. #endif #else if (pci_mode != -1) return pci_mode; #if NBIOS > 0 /* * If we have PCI info passed from the BIOS, use the mode given there * for all of this code. If not, pass on through to the previous tests * to try and devine the correct mode. */ if (bios_pciinfo != NULL) { if (bios_pciinfo->pci_chars & 0x2) return (pci_mode = 2); if (bios_pciinfo->pci_chars & 0x1) return (pci_mode = 1); /* We should never get here, but if we do, fall through... */ } #endif /* * We try to divine which configuration mode the host bridge wants. We * try mode 2 first, because our probe for mode 1 is likely to succeed * for mode 2 also. * * This should really be done using the PCI BIOS. If we get here, the * PCI BIOS does not exist, or the boot blocks did not provide the * information. */ outb(PCI_MODE2_ENABLE_REG, 0); outb(PCI_MODE2_FORWARD_REG, 0); if (inb(PCI_MODE2_ENABLE_REG) != 0 || inb(PCI_MODE2_FORWARD_REG) != 0) goto not2; return (pci_mode = 2); not2: outl(PCI_MODE1_ADDRESS_REG, PCI_MODE1_ENABLE); if (inl(PCI_MODE1_ADDRESS_REG) != PCI_MODE1_ENABLE) goto not1; outl(PCI_MODE1_ADDRESS_REG, 0); if (inl(PCI_MODE1_ADDRESS_REG) != 0) goto not1; return (pci_mode = 1); not1: return (pci_mode = 0); #endif } int pci_intr_map(pa, ihp) struct pci_attach_args *pa; pci_intr_handle_t *ihp; { #if NPCIBIOS > 0 pci_chipset_tag_t pc = pa->pa_pc; pcitag_t intrtag = pa->pa_intrtag; #endif 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; } ihp->line = line; ihp->pin = pin; #if NPCIBIOS > 0 pci_intr_header_fixup(pc, intrtag, ihp); line = ihp->line; #endif /* * 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 == 2) { printf("pci_intr_map: changed line 2 to line 9\n"); line = 9; } } return 0; bad: ihp->line = -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.line == 0 || ih.line >= ICU_LEN || ih.line == 2) panic("pci_intr_string: bogus handle 0x%x", ih.line); sprintf(irqstr, "irq %d", ih.line); return (irqstr); } void * pci_intr_establish(pc, ih, level, func, arg, what) pci_chipset_tag_t pc; pci_intr_handle_t ih; int level, (*func) __P((void *)); void *arg; char *what; { void *ret; if (ih.line == 0 || ih.line >= ICU_LEN || ih.line == 2) panic("pci_intr_establish: bogus handle 0x%x", ih.line); ret = isa_intr_establish(NULL, ih.line, IST_LEVEL, level, func, arg, what); #if NPCIBIOS > 0 if (ret) pci_intr_route_link(pc, &ih); #endif return ret; } void pci_intr_disestablish(pc, cookie) pci_chipset_tag_t pc; void *cookie; { /* XXX oh, unroute the pci int link? */ return isa_intr_disestablish(NULL, cookie); }