/* $OpenBSD: pci_machdep.c,v 1.9 1996/11/28 23:37:42 niklas Exp $ */ /* $NetBSD: pci_machdep.c,v 1.26 1996/10/24 12:32:29 fvdl Exp $ */ /* * 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 #include #include #include #include #include #include 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 void pci_attach_hook(parent, self, pba) struct device *parent, *self; struct pcibus_attach_args *pba; { if (pba->pba_bus == 0) printf(": configuration mode %d", pci_mode); } 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 } 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); #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; /* * 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. * * XXX * This should really be done using the PCI BIOS. */ 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(pc, intrtag, pin, line, ihp) pci_chipset_tag_t pc; pcitag_t intrtag; int pin, line; pci_intr_handle_t *ihp; { 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 == 2) { 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 == 2) panic("pci_intr_string: bogus handle 0x%x\n", ih); sprintf(irqstr, "irq %d", ih); 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; { if (ih == 0 || ih >= ICU_LEN || ih == 2) panic("pci_intr_establish: bogus handle 0x%x\n", ih); return isa_intr_establish(NULL, ih, IST_LEVEL, level, func, arg, what); } void pci_intr_disestablish(pc, cookie) pci_chipset_tag_t pc; void *cookie; { return isa_intr_disestablish(NULL, cookie); }