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NetBSD/sys/dev/pci/pci_map.c

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/* $NetBSD: pci_map.c,v 1.24 2008/07/22 04:52:19 bjs 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.
*
* 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pci_map.c,v 1.24 2008/07/22 04:52:19 bjs Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
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) {
aprint_debug("pci_io_find: expected type i/o, found mem\n");
return (1);
}
if (PCI_MAPREG_IO_SIZE(mask) == 0) {
aprint_debug("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, isrom;
is64bit = (PCI_MAPREG_MEM_TYPE(type) == PCI_MAPREG_MEM_TYPE_64BIT);
isrom = (reg == PCI_MAPREG_ROM);
if ((!isrom) && (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 (!isrom) {
/*
* roms should have an enable bit instead of a memory
* type decoder bit. For normal BARs, make sure that
* the address decoder type matches what we asked for.
*/
if (PCI_MAPREG_TYPE(address) != PCI_MAPREG_TYPE_MEM) {
printf("pci_mem_find: expected type mem, found i/o\n");
return (1);
}
/* XXX Allow 64bit bars for 32bit requests.*/
if (PCI_MAPREG_MEM_TYPE(address) !=
PCI_MAPREG_MEM_TYPE(type) &&
PCI_MAPREG_MEM_TYPE(address) !=
PCI_MAPREG_MEM_TYPE_64BIT) {
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 ((is64bit && PCI_MAPREG_MEM64_SIZE(wmask) == 0) ||
(!is64bit && PCI_MAPREG_MEM_SIZE(mask) == 0)) {
aprint_debug("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 = (isrom || PCI_MAPREG_MEM_PREFETCHABLE(address)) ?
BUS_SPACE_MAP_PREFETCHABLE : 0;
return (0);
}
#define _PCI_MAPREG_TYPEBITS(reg) \
(PCI_MAPREG_TYPE(reg) == PCI_MAPREG_TYPE_IO ? \
reg & PCI_MAPREG_TYPE_MASK : \
reg & (PCI_MAPREG_TYPE_MASK|PCI_MAPREG_MEM_TYPE_MASK))
pcireg_t
pci_mapreg_type(pci_chipset_tag_t pc, pcitag_t tag, int reg)
{
return (_PCI_MAPREG_TYPEBITS(pci_conf_read(pc, tag, reg)));
}
int
pci_mapreg_probe(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t *typep)
{
pcireg_t address, mask;
int s;
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 (mask == 0) /* unimplemented mapping register */
return (0);
if (typep)
*typep = _PCI_MAPREG_TYPEBITS(address);
return (1);
}
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)
{
return pci_mapreg_submap(pa, reg, type, busflags, 0, 0, tagp,
handlep, basep, sizep);
}
int
pci_mapreg_submap(struct pci_attach_args *pa, int reg, pcireg_t type,
int busflags, bus_size_t maxsize, bus_size_t offset, 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 (reg == PCI_MAPREG_ROM) {
pcireg_t mask;
int s;
/* we have to enable the ROM address decoder... */
s = splhigh();
mask = pci_conf_read(pa->pa_pc, pa->pa_tag, reg);
mask |= PCI_MAPREG_ROM_ENABLE;
pci_conf_write(pa->pa_pc, pa->pa_tag, reg, mask);
splx(s);
}
/* If we're called with maxsize/offset of 0, behave like
* pci_mapreg_map.
*/
maxsize = (maxsize && offset) ? maxsize : size;
base += offset;
if ((maxsize < size && offset + maxsize <= size) || offset != 0)
return (1);
if (bus_space_map(tag, base, maxsize, busflags | flags, &handle))
return (1);
if (tagp != 0)
*tagp = tag;
if (handlep != 0)
*handlep = handle;
if (basep != 0)
*basep = base;
if (sizep != 0)
*sizep = maxsize;
return (0);
}
int
pci_find_rom(struct pci_attach_args *pa, bus_space_tag_t bst,
bus_space_handle_t bsh, int type, bus_space_handle_t *romh, bus_size_t *sz)
{
bus_size_t romsz, offset = 0, imagesz;
uint16_t ptr;
int done = 0;
if (pci_mem_find(pa->pa_pc, pa->pa_tag, PCI_MAPREG_ROM,
PCI_MAPREG_TYPE_ROM, NULL, &romsz, NULL))
return 1;
/*
* no upper bound check; i cannot imagine a 4GB ROM, but
* it appears the spec would allow it!
*/
if (romsz < 1024)
return 1;
while (offset < romsz && !done){
struct pci_rom_header hdr;
struct pci_rom rom;
hdr.romh_magic = bus_space_read_2(bst, bsh,
offset + offsetof (struct pci_rom_header, romh_magic));
hdr.romh_data_ptr = bus_space_read_2(bst, bsh,
offset + offsetof (struct pci_rom_header, romh_data_ptr));
/* no warning: quite possibly ROM is simply not populated */
if (hdr.romh_magic != PCI_ROM_HEADER_MAGIC)
return 1;
ptr = offset + hdr.romh_data_ptr;
if (ptr > romsz) {
printf("pci_find_rom: rom data ptr out of range\n");
return 1;
}
rom.rom_signature = bus_space_read_4(bst, bsh, ptr);
rom.rom_vendor = bus_space_read_2(bst, bsh, ptr +
offsetof(struct pci_rom, rom_vendor));
rom.rom_product = bus_space_read_2(bst, bsh, ptr +
offsetof(struct pci_rom, rom_product));
rom.rom_class = bus_space_read_1(bst, bsh,
ptr + offsetof (struct pci_rom, rom_class));
rom.rom_subclass = bus_space_read_1(bst, bsh,
ptr + offsetof (struct pci_rom, rom_subclass));
rom.rom_interface = bus_space_read_1(bst, bsh,
ptr + offsetof (struct pci_rom, rom_interface));
rom.rom_len = bus_space_read_2(bst, bsh,
ptr + offsetof (struct pci_rom, rom_len));
rom.rom_code_type = bus_space_read_1(bst, bsh,
ptr + offsetof (struct pci_rom, rom_code_type));
rom.rom_indicator = bus_space_read_1(bst, bsh,
ptr + offsetof (struct pci_rom, rom_indicator));
if (rom.rom_signature != PCI_ROM_SIGNATURE) {
printf("pci_find_rom: bad rom data signature\n");
return 1;
}
imagesz = rom.rom_len * 512;
if ((rom.rom_vendor == PCI_VENDOR(pa->pa_id)) &&
(rom.rom_product == PCI_PRODUCT(pa->pa_id)) &&
(rom.rom_class == PCI_CLASS(pa->pa_class)) &&
(rom.rom_subclass == PCI_SUBCLASS(pa->pa_class)) &&
(rom.rom_interface == PCI_INTERFACE(pa->pa_class)) &&
(rom.rom_code_type == type)) {
*sz = imagesz;
bus_space_subregion(bst, bsh, offset, imagesz, romh);
return 0;
}
/* last image check */
if (rom.rom_indicator & PCI_ROM_INDICATOR_LAST)
return 1;
/* offset by size */
offset += imagesz;
}
return 1;
}
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