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 * $FreeBSD$
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
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
48 static void
pci_uart_intr_assert(void * arg)49 pci_uart_intr_assert(void *arg)
50 {
51 struct pci_devinst *pi = arg;
52
53 pci_lintr_assert(pi);
54 }
55
56 static void
pci_uart_intr_deassert(void * arg)57 pci_uart_intr_deassert(void *arg)
58 {
59 struct pci_devinst *pi = arg;
60
61 pci_lintr_deassert(pi);
62 }
63
64 static void
pci_uart_write(struct vmctx * ctx,int vcpu,struct pci_devinst * pi,int baridx,uint64_t offset,int size,uint64_t value)65 pci_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
75 uint64_t
pci_uart_read(struct vmctx * ctx,int vcpu,struct pci_devinst * pi,int baridx,uint64_t offset,int size)76 pci_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
88 static int
pci_uart_init(struct vmctx * ctx,struct pci_devinst * pi,char * opts)89 pci_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
113 struct 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 };
119 PCI_EMUL_SET(pci_de_com);
120