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/*
* The PCI Library -- OpenBSD /dev/pci access
*
* Adapted from fbsd-device.c by Matthieu Herrb <matthieu.herrb@laas.fr>, 2006
*
* Can be freely distributed and used under the terms of the GNU GPL v2+.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/endian.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/pciio.h>
#include "internal.h"
static void
obsd_config(struct pci_access *a)
{
pci_define_param(a, "obsd.path", PCI_PATH_OBSD_DEVICE, "Path to the OpenBSD PCI device");
}
static int
obsd_detect(struct pci_access *a)
{
char *name = pci_get_param(a, "obsd.path");
if (access(name, R_OK))
{
a->warning("Cannot open %s", name);
return 0;
}
a->debug("...using %s", name);
return 1;
}
static void
obsd_init(struct pci_access *a)
{
char *name = pci_get_param(a, "obsd.path");
a->fd = open(name, O_RDWR, 0);
if (a->fd < 0)
a->error("obsd_init: %s open failed", name);
}
static void
obsd_cleanup(struct pci_access *a)
{
close(a->fd);
}
static int
obsd_read(struct pci_dev *d, int pos, byte *buf, int len)
{
struct pci_io pi;
union {
u_int32_t u32;
u_int16_t u16[2];
u_int8_t u8[4];
} u;
if (!(len == 1 || len == 2 || len == 4))
return pci_generic_block_read(d, pos, buf, len);
if (d->domain || pos >= 256)
return 0;
pi.pi_sel.pc_bus = d->bus;
pi.pi_sel.pc_dev = d->dev;
pi.pi_sel.pc_func = d->func;
pi.pi_reg = pos - (pos % 4);
pi.pi_width = 4;
if (ioctl(d->access->fd, PCIOCREAD, &pi) < 0) {
if (errno == ENXIO)
pi.pi_data = 0xffffffff;
else
d->access->error("obsd_read: ioctl(PCIOCREAD) failed");
}
u.u32 = pi.pi_data;
switch (len)
{
case 1:
buf[0] = (u8) u.u8[pos % 4];
break;
case 2:
((u16 *) buf)[0] = letoh16(u.u16[(pos % 4) / 2]);
break;
case 4:
((u32 *) buf)[0] = (u32) letoh32(pi.pi_data);
break;
}
return 1;
}
static int
obsd_write(struct pci_dev *d, int pos, byte *buf, int len)
{
struct pci_io pi;
if (!(len == 1 || len == 2 || len == 4))
return pci_generic_block_write(d, pos, buf, len);
if (d->domain || pos >= 256)
return 0;
pi.pi_sel.pc_bus = d->bus;
pi.pi_sel.pc_dev = d->dev;
pi.pi_sel.pc_func = d->func;
pi.pi_reg = pos;
pi.pi_width = len;
switch (len)
{
case 1:
pi.pi_data = buf[0];
break;
case 2:
pi.pi_data = ((u16 *) buf)[0];
break;
case 4:
pi.pi_data = ((u32 *) buf)[0];
break;
}
if (ioctl(d->access->fd, PCIOCWRITE, &pi) < 0)
d->access->error("obsd_write: ioctl(PCIOCWRITE) failed");
return 1;
}
struct pci_methods pm_obsd_device = {
"obsd-device",
"/dev/pci on OpenBSD",
obsd_config,
obsd_detect,
obsd_init,
obsd_cleanup,
pci_generic_scan,
pci_generic_fill_info,
obsd_read,
obsd_write,
NULL, /* read_vpd */
NULL, /* dev_init */
NULL /* dev_cleanup */
};
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