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/types.h>
30
31 #include <stdio.h>
32
33 #include "bhyverun.h"
34 #include "config.h"
35 #include "debug.h"
36 #include "pci_emul.h"
37 #include "uart_emul.h"
38
39 /*
40 * Pick a PCI vid/did of a chip with a single uart at
41 * BAR0, that most versions of FreeBSD can understand:
42 * Siig CyberSerial 1-port.
43 */
44 #define COM_VENDOR 0x131f
45 #define COM_DEV 0x2000
46
47 static void
pci_uart_intr_assert(void * arg)48 pci_uart_intr_assert(void *arg)
49 {
50 struct pci_devinst *pi = arg;
51
52 pci_lintr_assert(pi);
53 }
54
55 static void
pci_uart_intr_deassert(void * arg)56 pci_uart_intr_deassert(void *arg)
57 {
58 struct pci_devinst *pi = arg;
59
60 pci_lintr_deassert(pi);
61 }
62
63 static void
pci_uart_write(struct pci_devinst * pi,int baridx,uint64_t offset,int size,uint64_t value)64 pci_uart_write(struct pci_devinst *pi, int baridx, uint64_t offset, int size,
65 uint64_t value)
66 {
67 assert(baridx == 0);
68 assert(size == 1);
69
70 uart_ns16550_write(pi->pi_arg, offset, value);
71 }
72
73 static uint64_t
pci_uart_read(struct pci_devinst * pi,int baridx,uint64_t offset,int size)74 pci_uart_read(struct pci_devinst *pi, int baridx, uint64_t offset, int size)
75 {
76 uint8_t val;
77
78 assert(baridx == 0);
79 assert(size == 1);
80
81 val = uart_ns16550_read(pi->pi_arg, offset);
82 return (val);
83 }
84
85 static int
pci_uart_legacy_config(nvlist_t * nvl,const char * opts)86 pci_uart_legacy_config(nvlist_t *nvl, const char *opts)
87 {
88
89 if (opts != NULL)
90 set_config_value_node(nvl, "path", opts);
91 return (0);
92 }
93
94 static int
pci_uart_init(struct pci_devinst * pi,nvlist_t * nvl)95 pci_uart_init(struct pci_devinst *pi, nvlist_t *nvl)
96 {
97 struct uart_ns16550_softc *sc;
98 const char *device;
99
100 pci_emul_alloc_bar(pi, 0, PCIBAR_IO, UART_NS16550_IO_BAR_SIZE);
101 pci_lintr_request(pi);
102
103 /* initialize config space */
104 pci_set_cfgdata16(pi, PCIR_DEVICE, COM_DEV);
105 pci_set_cfgdata16(pi, PCIR_VENDOR, COM_VENDOR);
106 pci_set_cfgdata8(pi, PCIR_CLASS, PCIC_SIMPLECOMM);
107
108 sc = uart_ns16550_init(pci_uart_intr_assert, pci_uart_intr_deassert,
109 pi);
110 pi->pi_arg = sc;
111
112 device = get_config_value_node(nvl, "path");
113 if (device != NULL && uart_ns16550_tty_open(sc, device) != 0) {
114 EPRINTLN("Unable to initialize backend '%s' for "
115 "pci uart at %d:%d", device, pi->pi_slot, pi->pi_func);
116 return (-1);
117 }
118
119 return (0);
120 }
121
122 static const struct pci_devemu pci_de_com = {
123 .pe_emu = "uart",
124 .pe_init = pci_uart_init,
125 .pe_legacy_config = pci_uart_legacy_config,
126 .pe_barwrite = pci_uart_write,
127 .pe_barread = pci_uart_read
128 };
129 PCI_EMUL_SET(pci_de_com);
130