acrn-hypervisor/devicemodel/hw/pci/uart.c

122 lines
3.3 KiB
C

/*-
* Copyright (c) 2012 NetApp, Inc.
* All rights reserved.
*
* 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 NETAPP, INC ``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 NETAPP, INC 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.
*
* $FreeBSD$
*/
#include <stdio.h>
#include <sys/errno.h>
#include "pci_core.h"
#include "uart_core.h"
/*
* Pick a PCI vid/did of a chip with a single uart at
* BAR0, that most versions of FreeBSD can understand:
* Siig CyberSerial 1-port.
*/
#define COM_VENDOR 0x131f
#define COM_DEV 0x2000
static void
pci_uart_intr_assert(void *arg)
{
struct pci_vdev *dev = arg;
pci_lintr_assert(dev);
}
static void
pci_uart_intr_deassert(void *arg)
{
struct pci_vdev *dev = arg;
pci_lintr_deassert(dev);
}
static void
pci_uart_write(struct vmctx *ctx, int vcpu, struct pci_vdev *dev,
int baridx, uint64_t offset, int size, uint64_t value)
{
assert(baridx == 0);
assert(size == 1);
uart_write(dev->arg, offset, value);
}
uint64_t
pci_uart_read(struct vmctx *ctx, int vcpu, struct pci_vdev *dev,
int baridx, uint64_t offset, int size)
{
uint8_t val;
assert(baridx == 0);
assert(size == 1);
val = uart_read(dev->arg, offset);
return val;
}
static int
pci_uart_init(struct vmctx *ctx, struct pci_vdev *dev, char *opts)
{
pci_emul_alloc_bar(dev, 0, PCIBAR_IO, UART_IO_BAR_SIZE);
pci_lintr_request(dev);
/* initialize config space */
pci_set_cfgdata16(dev, PCIR_DEVICE, COM_DEV);
pci_set_cfgdata16(dev, PCIR_VENDOR, COM_VENDOR);
pci_set_cfgdata8(dev, PCIR_CLASS, PCIC_SIMPLECOMM);
dev->arg = uart_set_backend(pci_uart_intr_assert, pci_uart_intr_deassert, dev, opts);
if (dev->arg == NULL) {
fprintf(stderr, "Unable to initialize backend '%s' for "
"pci uart at %d:%d\n", opts, dev->slot, dev->func);
return -1;
}
return 0;
}
static void
pci_uart_deinit(struct vmctx *ctx, struct pci_vdev *dev, char *opts)
{
struct uart_vdev *uart = (struct uart_vdev *)dev->arg;
if (uart == NULL)
return;
uart_release_backend(uart, opts);
}
struct pci_vdev_ops pci_ops_com = {
.class_name = "uart",
.vdev_init = pci_uart_init,
.vdev_deinit = pci_uart_deinit,
.vdev_barwrite = pci_uart_write,
.vdev_barread = pci_uart_read
};
DEFINE_PCI_DEVTYPE(pci_ops_com);