1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 * $FreeBSD$
29 */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
33
34 #include <sys/types.h>
35
36 #include <stdio.h>
37
38 #include "bhyverun.h"
39 #include "config.h"
40 #include "debug.h"
41 #include "pci_emul.h"
42 #include "uart_emul.h"
43
44 /*
45 * Pick a PCI vid/did of a chip with a single uart at
46 * BAR0, that most versions of FreeBSD can understand:
47 * Siig CyberSerial 1-port.
48 */
49 #define COM_VENDOR 0x131f
50 #define COM_DEV 0x2000
51
52 static void
pci_uart_intr_assert(void * arg)53 pci_uart_intr_assert(void *arg)
54 {
55 struct pci_devinst *pi = arg;
56
57 pci_lintr_assert(pi);
58 }
59
60 static void
pci_uart_intr_deassert(void * arg)61 pci_uart_intr_deassert(void *arg)
62 {
63 struct pci_devinst *pi = arg;
64
65 pci_lintr_deassert(pi);
66 }
67
68 static void
pci_uart_write(struct vmctx * ctx,int vcpu,struct pci_devinst * pi,int baridx,uint64_t offset,int size,uint64_t value)69 pci_uart_write(struct vmctx *ctx, int vcpu, struct pci_devinst *pi,
70 int baridx, uint64_t offset, int size, uint64_t value)
71 {
72
73 assert(baridx == 0);
74 assert(size == 1);
75
76 uart_write(pi->pi_arg, offset, value);
77 }
78
79 uint64_t
pci_uart_read(struct vmctx * ctx,int vcpu,struct pci_devinst * pi,int baridx,uint64_t offset,int size)80 pci_uart_read(struct vmctx *ctx, int vcpu, struct pci_devinst *pi,
81 int baridx, uint64_t offset, int size)
82 {
83 uint8_t val;
84
85 assert(baridx == 0);
86 assert(size == 1);
87
88 val = uart_read(pi->pi_arg, offset);
89 return (val);
90 }
91
92 static int
pci_uart_legacy_config(nvlist_t * nvl,const char * opts)93 pci_uart_legacy_config(nvlist_t *nvl, const char *opts)
94 {
95
96 if (opts != NULL)
97 set_config_value_node(nvl, "path", opts);
98 return (0);
99 }
100
101 static int
pci_uart_init(struct vmctx * ctx,struct pci_devinst * pi,nvlist_t * nvl)102 pci_uart_init(struct vmctx *ctx, struct pci_devinst *pi, nvlist_t *nvl)
103 {
104 struct uart_softc *sc;
105 const char *device;
106
107 pci_emul_alloc_bar(pi, 0, PCIBAR_IO, UART_IO_BAR_SIZE);
108 pci_lintr_request(pi);
109
110 /* initialize config space */
111 pci_set_cfgdata16(pi, PCIR_DEVICE, COM_DEV);
112 pci_set_cfgdata16(pi, PCIR_VENDOR, COM_VENDOR);
113 pci_set_cfgdata8(pi, PCIR_CLASS, PCIC_SIMPLECOMM);
114
115 sc = uart_init(pci_uart_intr_assert, pci_uart_intr_deassert, pi);
116 pi->pi_arg = sc;
117
118 device = get_config_value_node(nvl, "path");
119 if (uart_set_backend(sc, device) != 0) {
120 EPRINTLN("Unable to initialize backend '%s' for "
121 "pci uart at %d:%d", device, pi->pi_slot, pi->pi_func);
122 return (-1);
123 }
124
125 return (0);
126 }
127
128 struct pci_devemu pci_de_com = {
129 .pe_emu = "uart",
130 .pe_init = pci_uart_init,
131 .pe_legacy_config = pci_uart_legacy_config,
132 .pe_barwrite = pci_uart_write,
133 .pe_barread = pci_uart_read
134 };
135 PCI_EMUL_SET(pci_de_com);
136