1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2012 NetApp, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30
31 #include <sys/types.h>
32
33 #include <stdio.h>
34
35 #include "bhyverun.h"
36 #include "config.h"
37 #include "debug.h"
38 #include "pci_emul.h"
39 #include "uart_emul.h"
40
41 /*
42 * Pick a PCI vid/did of a chip with a single uart at
43 * BAR0, that most versions of FreeBSD can understand:
44 * Siig CyberSerial 1-port.
45 */
46 #define COM_VENDOR 0x131f
47 #define COM_DEV 0x2000
48
49 static void
pci_uart_intr_assert(void * arg)50 pci_uart_intr_assert(void *arg)
51 {
52 struct pci_devinst *pi = arg;
53
54 pci_lintr_assert(pi);
55 }
56
57 static void
pci_uart_intr_deassert(void * arg)58 pci_uart_intr_deassert(void *arg)
59 {
60 struct pci_devinst *pi = arg;
61
62 pci_lintr_deassert(pi);
63 }
64
65 static void
pci_uart_write(struct pci_devinst * pi,int baridx,uint64_t offset,int size,uint64_t value)66 pci_uart_write(struct pci_devinst *pi, int baridx, uint64_t offset, int size,
67 uint64_t value)
68 {
69 assert(baridx == 0);
70 assert(size == 1);
71
72 uart_write(pi->pi_arg, offset, value);
73 }
74
75 static uint64_t
pci_uart_read(struct pci_devinst * pi,int baridx,uint64_t offset,int size)76 pci_uart_read(struct pci_devinst *pi, int baridx, uint64_t offset, int size)
77 {
78 uint8_t val;
79
80 assert(baridx == 0);
81 assert(size == 1);
82
83 val = uart_read(pi->pi_arg, offset);
84 return (val);
85 }
86
87 static int
pci_uart_legacy_config(nvlist_t * nvl,const char * opts)88 pci_uart_legacy_config(nvlist_t *nvl, const char *opts)
89 {
90
91 if (opts != NULL)
92 set_config_value_node(nvl, "path", opts);
93 return (0);
94 }
95
96 static int
pci_uart_init(struct pci_devinst * pi,nvlist_t * nvl)97 pci_uart_init(struct pci_devinst *pi, nvlist_t *nvl)
98 {
99 struct uart_softc *sc;
100 const char *device;
101
102 pci_emul_alloc_bar(pi, 0, PCIBAR_IO, UART_IO_BAR_SIZE);
103 pci_lintr_request(pi);
104
105 /* initialize config space */
106 pci_set_cfgdata16(pi, PCIR_DEVICE, COM_DEV);
107 pci_set_cfgdata16(pi, PCIR_VENDOR, COM_VENDOR);
108 pci_set_cfgdata8(pi, PCIR_CLASS, PCIC_SIMPLECOMM);
109
110 sc = uart_init(pci_uart_intr_assert, pci_uart_intr_deassert, pi);
111 pi->pi_arg = sc;
112
113 device = get_config_value_node(nvl, "path");
114 if (uart_set_backend(sc, device) != 0) {
115 EPRINTLN("Unable to initialize backend '%s' for "
116 "pci uart at %d:%d", device, pi->pi_slot, pi->pi_func);
117 return (-1);
118 }
119
120 return (0);
121 }
122
123 static const struct pci_devemu pci_de_com = {
124 .pe_emu = "uart",
125 .pe_init = pci_uart_init,
126 .pe_legacy_config = pci_uart_legacy_config,
127 .pe_barwrite = pci_uart_write,
128 .pe_barread = pci_uart_read
129 };
130 PCI_EMUL_SET(pci_de_com);
131