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NetBSD/sys/dev/pci/pci_map.c

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/* $NetBSD: pci_map.c,v 1.7 2000/05/10 16:58:42 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 <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 __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, 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 || reg >= PCI_MAPREG_END || (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(pc, tag, reg)
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(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);
}
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