/* $NetBSD: pci_map.c,v 1.9 2000/11/29 18:22:17 thorpej Exp $ */ /*- * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Charles M. Hannum; by William R. Studenmund; by Jason R. Thorpe. * * 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. */ /* * PCI device mapping. */ #include #include #include #include #include static int pci_io_find(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 || #if 0 /* * Can't do this check; some devices have mapping registers * way out in left field. */ reg >= PCI_MAPREG_END || #endif (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(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, address1 = 0, mask1 = 0xffffffff; u_int64_t waddress, wmask; int s, is64bit; is64bit = (PCI_MAPREG_MEM_TYPE(type) == PCI_MAPREG_MEM_TYPE_64BIT); if (reg < PCI_MAPREG_START || #if 0 /* * Can't do this check; some devices have mapping registers * way out in left field. */ reg >= PCI_MAPREG_END || #endif (reg & 3)) panic("pci_mem_find: bad request"); if (is64bit && (reg + 4) >= PCI_MAPREG_END) panic("pci_mem_find: bad 64-bit 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); if (is64bit) { address1 = pci_conf_read(pc, tag, reg + 4); pci_conf_write(pc, tag, reg + 4, 0xffffffff); mask1 = pci_conf_read(pc, tag, reg + 4); pci_conf_write(pc, tag, reg + 4, address1); } 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); } waddress = (u_int64_t)address1 << 32UL | address; wmask = (u_int64_t)mask1 << 32UL | mask; if (PCI_MAPREG_MEM64_SIZE(wmask) == 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: /* * Handle the case of a 64-bit memory register on a * platform with 32-bit addressing. Make sure that * the address assigned and the device's memory size * fit in 32 bits. We implicitly assume that if * bus_addr_t is 64-bit, then so is bus_size_t. */ if (sizeof(u_int64_t) > sizeof(bus_addr_t) && (address1 != 0 || mask1 != 0xffffffff)) { printf("pci_mem_find: 64-bit memory map which is " "inaccessible on a 32-bit platform\n"); return (1); } break; default: printf("pci_mem_find: reserved mapping register type\n"); return (1); } if (sizeof(u_int64_t) > sizeof(bus_addr_t)) { if (basep != 0) *basep = PCI_MAPREG_MEM_ADDR(address); if (sizep != 0) *sizep = PCI_MAPREG_MEM_SIZE(mask); } else { if (basep != 0) *basep = PCI_MAPREG_MEM64_ADDR(waddress); if (sizep != 0) *sizep = PCI_MAPREG_MEM64_SIZE(wmask); } if (flagsp != 0) *flagsp = PCI_MAPREG_MEM_PREFETCHABLE(address) ? BUS_SPACE_MAP_PREFETCHABLE : 0; return (0); } pcireg_t pci_mapreg_type(pci_chipset_tag_t pc, pcitag_t tag, int reg) { pcireg_t rv; rv = pci_conf_read(pc, tag, reg); if (PCI_MAPREG_TYPE(rv) == PCI_MAPREG_TYPE_IO) rv &= PCI_MAPREG_TYPE_MASK; else rv &= PCI_MAPREG_TYPE_MASK|PCI_MAPREG_MEM_TYPE_MASK; return (rv); } int pci_mapreg_info(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(struct pci_attach_args *pa, int reg, pcireg_t type, int busflags, 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); }