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/*
* The PCI Library -- NetBSD libpci access
* (based on FreeBSD /dev/pci access)
*
* Copyright (c) 1999 Jari Kirma <kirma@cs.hut.fi>
* Copyright (c) 2002 Quentin Garnier <cube@cubidou.net>
* Copyright (c) 2002 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL v2+.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/*
* Read functionality of this driver is briefly tested, and seems
* to supply basic information correctly, but I promise no more.
*/
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <pci.h>
#include "internal.h"
static void
nbsd_config(struct pci_access *a)
{
pci_define_param(a, "nbsd.path", PCI_PATH_NBSD_DEVICE, "Path to the NetBSD PCI device");
}
static int
nbsd_detect(struct pci_access *a)
{
char *name = pci_get_param(a, "nbsd.path");
if (access(name, R_OK))
{
a->warning("Cannot open %s", name);
return 0;
}
if (!access(name, W_OK))
a->writeable = O_RDWR;
a->debug("...using %s", name);
return 1;
}
static void
nbsd_init(struct pci_access *a)
{
char *name = pci_get_param(a, "nbsd.path");
int mode = a->writeable ? O_RDWR : O_RDONLY;
a->fd = open(name, mode, 0);
if (a->fd < 0)
a->error("nbsd_init: %s open failed", name);
}
static void
nbsd_cleanup(struct pci_access *a)
{
close(a->fd);
}
static int
nbsd_read(struct pci_dev *d, int pos, byte *buf, int len)
{
pcireg_t val;
int shift;
if (!(len == 1 || len == 2 || len == 4))
return pci_generic_block_read(d, pos, buf, len);
if (d->domain || pos >= 4096)
return 0;
shift = 8*(pos % 4);
pos &= ~3;
if (pcibus_conf_read(d->access->fd, d->bus, d->dev, d->func, pos, &val) < 0)
d->access->error("nbsd_read: pci_bus_conf_read() failed");
switch (len)
{
case 1:
*buf = val >> shift;
break;
case 2:
*(u16*)buf = cpu_to_le16(val >> shift);
break;
case 4:
*(u32*)buf = cpu_to_le32(val);
break;
}
return 1;
}
static int
nbsd_write(struct pci_dev *d, int pos, byte *buf, int len)
{
pcireg_t val = 0;
int shift;
if (!(len == 1 || len == 2 || len == 4))
return pci_generic_block_write(d, pos, buf, len);
if (d->domain || pos >= 256)
return 0;
/*
* BEWARE: NetBSD seems to support only 32-bit access, so we have
* to emulate byte and word writes by read-modify-write, possibly
* causing troubles.
*/
shift = 8*(pos % 4);
pos &= ~3;
if (len != 4)
{
if (pcibus_conf_read(d->access->fd, d->bus, d->dev, d->func, pos, &val) < 0)
d->access->error("nbsd_write: pci_bus_conf_read() failed");
}
switch (len)
{
case 1:
val = (val & ~(0xff << shift)) | (buf[0] << shift);
break;
case 2:
val = (val & ~(0xffff << shift)) | (le16_to_cpu(*(u16*)buf) << shift);
break;
case 4:
val = le32_to_cpu(*(u32*)buf);
break;
}
if (pcibus_conf_write(d->access->fd, d->bus, d->dev, d->func, pos, val) < 0)
d->access->error("nbsd_write: pci_bus_conf_write() failed");
return 1;
}
struct pci_methods pm_nbsd_libpci = {
.name = "nbsd-libpci",
.help = "NetBSD libpci",
.config = nbsd_config,
.detect = nbsd_detect,
.init = nbsd_init,
.cleanup = nbsd_cleanup,
.scan = pci_generic_scan,
.fill_info = pci_generic_fill_info,
.read = nbsd_read,
.write = nbsd_write,
};
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