/*-
* Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
* All rights reserved.
*
* This software was developed by SRI International and the University of
* Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
* ("CTSRD"), as part of the DARPA CRASH research programme.
*
* 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 AUTHOR 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 AUTHOR 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.
*/
/*
* BERI virtio mmio backend common methods
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/cdefs.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/malloc.h>
#include <sys/rman.h>
#include <sys/timeet.h>
#include <sys/timetc.h>
#include <sys/conf.h>
#include <sys/uio.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/event.h>
#include <sys/selinfo.h>
#include <sys/endian.h>
#include <sys/rwlock.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <machine/cpu.h>
#include <machine/intr.h>
#include <dev/fdt/fdt_common.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/beri/virtio/virtio.h>
#include <dev/virtio/virtqueue.h>
#include <dev/virtio/virtio_ring.h>
#include <dev/altera/pio/pio.h>
#include "pio_if.h"
int
vq_ring_ready(struct vqueue_info *vq)
{
return (vq->vq_flags & VQ_ALLOC);
}
int
vq_has_descs(struct vqueue_info *vq)
{
return (vq_ring_ready(vq) && vq->vq_last_avail !=
be16toh(vq->vq_avail->idx));
}
void *
paddr_map(uint32_t offset, uint32_t phys, uint32_t size)
{
bus_space_handle_t bsh;
if (bus_space_map(fdtbus_bs_tag, (phys + offset),
size, 0, &bsh) != 0) {
panic("Couldn't map 0x%08x\n", (phys + offset));
}
return (void *)(bsh);
}
void
paddr_unmap(void *phys, uint32_t size)
{
bus_space_unmap(fdtbus_bs_tag, (bus_space_handle_t)phys, size);
}
static inline void
_vq_record(uint32_t offs, int i, volatile struct vring_desc *vd,
struct iovec *iov, int n_iov, uint16_t *flags) {
if (i >= n_iov)
return;
iov[i].iov_base = paddr_map(offs, be64toh(vd->addr),
be32toh(vd->len));
iov[i].iov_len = be32toh(vd->len);
if (flags != NULL)
flags[i] = be16toh(vd->flags);
}
int
vq_getchain(uint32_t offs, struct vqueue_info *vq,
struct iovec *iov, int n_iov, uint16_t *flags)
{
volatile struct vring_desc *vdir, *vindir, *vp;
int idx, ndesc, n_indir;
int head, next;
int i;
idx = vq->vq_last_avail;
ndesc = (be16toh(vq->vq_avail->idx) - idx);
if (ndesc == 0)
return (0);
head = be16toh(vq->vq_avail->ring[idx & (vq->vq_qsize - 1)]);
next = head;
for (i = 0; i < VQ_MAX_DESCRIPTORS; next = be16toh(vdir->next)) {
vdir = &vq->vq_desc[next];
if ((be16toh(vdir->flags) & VRING_DESC_F_INDIRECT) == 0) {
_vq_record(offs, i, vdir, iov, n_iov, flags);
i++;
} else {
n_indir = be32toh(vdir->len) / 16;
vindir = paddr_map(offs, be64toh(vdir->addr),
be32toh(vdir->len));
next = 0;
for (;;) {
vp = &vindir[next];
_vq_record(offs, i, vp, iov, n_iov, flags);
i+=1;
if ((be16toh(vp->flags) & \
VRING_DESC_F_NEXT) == 0)
break;
next = be16toh(vp->next);
}
paddr_unmap(__DEVOLATILE(void *, vindir), be32toh(vdir->len));
}
if ((be16toh(vdir->flags) & VRING_DESC_F_NEXT) == 0)
return (i);
}
return (i);
}
void
vq_relchain(struct vqueue_info *vq, struct iovec *iov, int n, uint32_t iolen)
{
volatile struct vring_used_elem *vue;
volatile struct vring_used *vu;
uint16_t head, uidx, mask;
int i;
mask = vq->vq_qsize - 1;
vu = vq->vq_used;
head = be16toh(vq->vq_avail->ring[vq->vq_last_avail++ & mask]);
uidx = be16toh(vu->idx);
vue = &vu->ring[uidx++ & mask];
vue->id = htobe32(head);
vue->len = htobe32(iolen);
vu->idx = htobe16(uidx);
/* Clean up */
for (i = 0; i < n; i++) {
paddr_unmap((void *)iov[i].iov_base, iov[i].iov_len);
}
}
int
setup_pio(device_t dev, char *name, device_t *pio_dev)
{
phandle_t pio_node;
struct fdt_ic *ic;
phandle_t xref;
phandle_t node;
if ((node = ofw_bus_get_node(dev)) == -1)
return (ENXIO);
if (OF_searchencprop(node, name, &xref,
sizeof(xref)) == -1) {
return (ENXIO);
}
pio_node = OF_node_from_xref(xref);
SLIST_FOREACH(ic, &fdt_ic_list_head, fdt_ics) {
if (ic->iph == pio_node) {
*pio_dev = ic->dev;
return (0);
}
}
return (ENXIO);
}
int
setup_offset(device_t dev, uint32_t *offset)
{
pcell_t dts_value[2];
phandle_t mem_node;
phandle_t xref;
phandle_t node;
int len;
if ((node = ofw_bus_get_node(dev)) == -1)
return (ENXIO);
if (OF_searchencprop(node, "beri-mem", &xref,
sizeof(xref)) == -1) {
return (ENXIO);
}
mem_node = OF_node_from_xref(xref);
if ((len = OF_getproplen(mem_node, "reg")) <= 0)
return (ENXIO);
OF_getencprop(mem_node, "reg", dts_value, len);
*offset = dts_value[0];
return (0);
}
struct iovec *
getcopy(struct iovec *iov, int n)
{
struct iovec *tiov;
int i;
tiov = malloc(n * sizeof(struct iovec), M_DEVBUF, M_NOWAIT);
for (i = 0; i < n; i++) {
tiov[i].iov_base = iov[i].iov_base;
tiov[i].iov_len = iov[i].iov_len;
}
return (tiov);
}