1/*-
2 * Copyright (c) 2012 NetApp, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: releng/11.0/usr.sbin/bhyve/pci_uart.c 261268 2014-01-29 14:56:48Z jhb $
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: releng/11.0/usr.sbin/bhyve/pci_uart.c 261268 2014-01-29 14:56:48Z jhb $");
31
32#include <sys/types.h>
33
34#include <stdio.h>
35
36#include "bhyverun.h"
37#include "pci_emul.h"
38#include "uart_emul.h"
39
40/*
41 * Pick a PCI vid/did of a chip with a single uart at
42 * BAR0, that most versions of FreeBSD can understand:
43 * Siig CyberSerial 1-port.
44 */
45#define COM_VENDOR	0x131f
46#define COM_DEV		0x2000
47
48static void
49pci_uart_intr_assert(void *arg)
50{
51	struct pci_devinst *pi = arg;
52
53	pci_lintr_assert(pi);
54}
55
56static void
57pci_uart_intr_deassert(void *arg)
58{
59	struct pci_devinst *pi = arg;
60
61	pci_lintr_deassert(pi);
62}
63
64static void
65pci_uart_write(struct vmctx *ctx, int vcpu, struct pci_devinst *pi,
66	       int baridx, uint64_t offset, int size, uint64_t value)
67{
68
69	assert(baridx == 0);
70	assert(size == 1);
71
72	uart_write(pi->pi_arg, offset, value);
73}
74
75uint64_t
76pci_uart_read(struct vmctx *ctx, int vcpu, struct pci_devinst *pi,
77	      int baridx, uint64_t offset, int size)
78{
79	uint8_t val;
80
81	assert(baridx == 0);
82	assert(size == 1);
83
84	val = uart_read(pi->pi_arg, offset);
85	return (val);
86}
87
88static int
89pci_uart_init(struct vmctx *ctx, struct pci_devinst *pi, char *opts)
90{
91	struct uart_softc *sc;
92
93	pci_emul_alloc_bar(pi, 0, PCIBAR_IO, UART_IO_BAR_SIZE);
94	pci_lintr_request(pi);
95
96	/* initialize config space */
97	pci_set_cfgdata16(pi, PCIR_DEVICE, COM_DEV);
98	pci_set_cfgdata16(pi, PCIR_VENDOR, COM_VENDOR);
99	pci_set_cfgdata8(pi, PCIR_CLASS, PCIC_SIMPLECOMM);
100
101	sc = uart_init(pci_uart_intr_assert, pci_uart_intr_deassert, pi);
102	pi->pi_arg = sc;
103
104	if (uart_set_backend(sc, opts) != 0) {
105		fprintf(stderr, "Unable to initialize backend '%s' for "
106		    "pci uart at %d:%d\n", opts, pi->pi_slot, pi->pi_func);
107		return (-1);
108	}
109
110	return (0);
111}
112
113struct pci_devemu pci_de_com = {
114	.pe_emu =	"uart",
115	.pe_init =	pci_uart_init,
116	.pe_barwrite =	pci_uart_write,
117	.pe_barread =	pci_uart_read
118};
119PCI_EMUL_SET(pci_de_com);
120