/* $NetBSD: pci_map.c,v 1.4 1997/10/06 21:01:24 thorpej Exp $ */ /* * Copyright (c) 1994, 1997 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. */ /* * PCI device mapping. */ #include #include #include #include #include static int pci_io_find __P((pci_chipset_tag_t, pcitag_t, int, pcireg_t, bus_addr_t *, bus_size_t *, int *)); static int pci_mem_find __P((pci_chipset_tag_t, pcitag_t, int, pcireg_t, bus_addr_t *, bus_size_t *, int *)); static int pci_io_find(pc, tag, reg, type, basep, sizep, flagsp) pci_chipset_tag_t pc; pcitag_t tag; int reg; pcireg_t type; bus_addr_t *basep; bus_size_t *sizep; int *flagsp; { pcireg_t address, mask; int s; if (reg < PCI_MAPREG_START || reg >= PCI_MAPREG_END || (reg & 3)) panic("pci_io_find: 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. */ s = splhigh(); address = pci_conf_read(pc, tag, reg); pci_conf_write(pc, tag, reg, 0xffffffff); mask = pci_conf_read(pc, tag, reg); pci_conf_write(pc, tag, reg, address); splx(s); if (PCI_MAPREG_TYPE(address) != PCI_MAPREG_TYPE_IO) { printf("pci_io_find: expected type i/o, found mem\n"); return (1); } if (PCI_MAPREG_IO_SIZE(mask) == 0) { printf("pci_io_find: void region\n"); return (1); } if (basep != 0) *basep = PCI_MAPREG_IO_ADDR(address); if (sizep != 0) *sizep = PCI_MAPREG_IO_SIZE(mask); if (flagsp != 0) *flagsp = 0; return (0); } static int pci_mem_find(pc, tag, reg, type, basep, sizep, flagsp) pci_chipset_tag_t pc; pcitag_t tag; int reg; pcireg_t type; bus_addr_t *basep; bus_size_t *sizep; int *flagsp; { pcireg_t address, mask; 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. */ s = splhigh(); address = pci_conf_read(pc, tag, reg); pci_conf_write(pc, tag, reg, 0xffffffff); mask = pci_conf_read(pc, tag, reg); pci_conf_write(pc, tag, reg, address); splx(s); if (PCI_MAPREG_TYPE(address) != PCI_MAPREG_TYPE_MEM) { printf("pci_mem_find: expected type mem, found i/o\n"); return (1); } if (PCI_MAPREG_MEM_TYPE(address) != PCI_MAPREG_MEM_TYPE(type)) { printf("pci_mem_find: expected mem type %08x, found %08x\n", PCI_MAPREG_MEM_TYPE(type), PCI_MAPREG_MEM_TYPE(address)); return (1); } if (PCI_MAPREG_MEM_SIZE(mask) == 0) { printf("pci_mem_find: void region\n"); return (1); } switch (PCI_MAPREG_MEM_TYPE(address)) { case PCI_MAPREG_MEM_TYPE_32BIT: case PCI_MAPREG_MEM_TYPE_32BIT_1M: break; case PCI_MAPREG_MEM_TYPE_64BIT: printf("pci_mem_find: 64-bit memory mapping register\n"); return (1); default: printf("pci_mem_find: reserved mapping register type\n"); return (1); } if (basep != 0) *basep = PCI_MAPREG_MEM_ADDR(address); if (sizep != 0) *sizep = PCI_MAPREG_MEM_SIZE(mask); if (flagsp != 0) *flagsp = PCI_MAPREG_MEM_CACHEABLE(address) ? BUS_SPACE_MAP_CACHEABLE : 0; return (0); } int pci_mapreg_info(pc, tag, reg, type, basep, sizep, flagsp) pci_chipset_tag_t pc; pcitag_t tag; int reg; pcireg_t type; bus_addr_t *basep; bus_size_t *sizep; int *flagsp; { if (PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_IO) return (pci_io_find(pc, tag, reg, type, basep, sizep, flagsp)); else return (pci_mem_find(pc, tag, reg, type, basep, sizep, flagsp)); } int pci_mapreg_map(pa, reg, type, busflags, tagp, handlep, basep, sizep) struct pci_attach_args *pa; int reg, busflags; pcireg_t type; bus_space_tag_t *tagp; bus_space_handle_t *handlep; bus_addr_t *basep; bus_size_t *sizep; { bus_space_tag_t tag; bus_space_handle_t handle; bus_addr_t base; bus_size_t size; int flags; if (PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_IO) { if ((pa->pa_flags & PCI_FLAGS_IO_ENABLED) == 0) return (1); if (pci_io_find(pa->pa_pc, pa->pa_tag, reg, type, &base, &size, &flags)) return (1); tag = pa->pa_iot; } else { if ((pa->pa_flags & PCI_FLAGS_MEM_ENABLED) == 0) return (1); if (pci_mem_find(pa->pa_pc, pa->pa_tag, reg, type, &base, &size, &flags)) return (1); tag = pa->pa_memt; } if (bus_space_map(tag, base, size, busflags | flags, &handle)) return (1); if (tagp != 0) *tagp = tag; if (handlep != 0) *handlep = handle; if (basep != 0) *basep = base; if (sizep != 0) *sizep = size; return (0); }