pci_lpc.c revision 261088 
1/*-
2 * Copyright (c) 2013 Neel Natu <neel@freebsd.org>
3 * Copyright (c) 2013 Tycho Nightingale <tycho.nightingale@pluribusnetworks.com>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * $FreeBSD: stable/10/usr.sbin/bhyve/pci_lpc.c 261088 2014-01-23 20:21:39Z jhb $
28 */
29
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD: stable/10/usr.sbin/bhyve/pci_lpc.c 261088 2014-01-23 20:21:39Z jhb $");
32
33#include <sys/types.h>
34#include <machine/vmm.h>
35#include <machine/vmm_dev.h>
36
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40
41#include <vmmapi.h>
42
43#include "inout.h"
44#include "pci_emul.h"
45#include "uart_emul.h"
46
47static struct pci_devinst *lpc_bridge;
48
49#define	LPC_UART_NUM	2
50static struct lpc_uart_softc {
51	struct uart_softc *uart_softc;
52	const char *opts;
53	int	iobase;
54	int	irq;
55} lpc_uart_softc[LPC_UART_NUM];
56
57static const char *lpc_uart_names[LPC_UART_NUM] = { "COM1", "COM2" };
58
59/*
60 * LPC device configuration is in the following form:
61 * <lpc_device_name>[,<options>]
62 * For e.g. "com1,stdio"
63 */
64int
65lpc_device_parse(const char *opts)
66{
67	int unit, error;
68	char *str, *cpy, *lpcdev;
69
70	error = -1;
71	str = cpy = strdup(opts);
72	lpcdev = strsep(&str, ",");
73	if (lpcdev != NULL) {
74		for (unit = 0; unit < LPC_UART_NUM; unit++) {
75			if (strcasecmp(lpcdev, lpc_uart_names[unit]) == 0) {
76				lpc_uart_softc[unit].opts = str;
77				error = 0;
78				goto done;
79			}
80		}
81	}
82
83done:
84	if (error)
85		free(cpy);
86
87	return (error);
88}
89
90static void
91lpc_uart_intr_assert(void *arg)
92{
93	struct lpc_uart_softc *sc = arg;
94
95	assert(sc->irq >= 0);
96
97	vm_ioapic_pulse_irq(lpc_bridge->pi_vmctx, sc->irq);
98}
99
100static void
101lpc_uart_intr_deassert(void *arg)
102{
103	/*
104	 * The COM devices on the LPC bus generate edge triggered interrupts,
105	 * so nothing more to do here.
106	 */
107}
108
109static int
110lpc_uart_io_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
111		    uint32_t *eax, void *arg)
112{
113	int offset;
114	struct lpc_uart_softc *sc = arg;
115
116	if (bytes != 1)
117		return (-1);
118
119	offset = port - sc->iobase;
120
121	if (in)
122		*eax = uart_read(sc->uart_softc, offset);
123	else
124		uart_write(sc->uart_softc, offset, *eax);
125
126	return (0);
127}
128
129static int
130lpc_init(void)
131{
132	struct lpc_uart_softc *sc;
133	struct inout_port iop;
134	const char *name;
135	int unit, error;
136
137	/* COM1 and COM2 */
138	for (unit = 0; unit < LPC_UART_NUM; unit++) {
139		sc = &lpc_uart_softc[unit];
140		name = lpc_uart_names[unit];
141
142		if (uart_legacy_alloc(unit, &sc->iobase, &sc->irq) != 0) {
143			fprintf(stderr, "Unable to allocate resources for "
144			    "LPC device %s\n", name);
145			return (-1);
146		}
147
148		sc->uart_softc = uart_init(lpc_uart_intr_assert,
149				    lpc_uart_intr_deassert, sc);
150
151		if (uart_set_backend(sc->uart_softc, sc->opts) != 0) {
152			fprintf(stderr, "Unable to initialize backend '%s' "
153			    "for LPC device %s\n", sc->opts, name);
154			return (-1);
155		}
156
157		bzero(&iop, sizeof(struct inout_port));
158		iop.name = name;
159		iop.port = sc->iobase;
160		iop.size = UART_IO_BAR_SIZE;
161		iop.flags = IOPORT_F_INOUT;
162		iop.handler = lpc_uart_io_handler;
163		iop.arg = sc;
164
165		error = register_inout(&iop);
166		assert(error == 0);
167	}
168
169	return (0);
170}
171
172static void
173pci_lpc_write(struct vmctx *ctx, int vcpu, struct pci_devinst *pi,
174	       int baridx, uint64_t offset, int size, uint64_t value)
175{
176}
177
178uint64_t
179pci_lpc_read(struct vmctx *ctx, int vcpu, struct pci_devinst *pi,
180	      int baridx, uint64_t offset, int size)
181{
182	return (0);
183}
184
185#define	LPC_DEV		0x7000
186#define	LPC_VENDOR	0x8086
187
188static int
189pci_lpc_init(struct vmctx *ctx, struct pci_devinst *pi, char *opts)
190{
191	/*
192	 * Do not allow more than one LPC bridge to be configured.
193	 */
194	if (lpc_bridge != NULL)
195		return (-1);
196
197	if (lpc_init() != 0)
198		return (-1);
199
200	/* initialize config space */
201	pci_set_cfgdata16(pi, PCIR_DEVICE, LPC_DEV);
202	pci_set_cfgdata16(pi, PCIR_VENDOR, LPC_VENDOR);
203	pci_set_cfgdata8(pi, PCIR_CLASS, PCIC_BRIDGE);
204	pci_set_cfgdata8(pi, PCIR_SUBCLASS, PCIS_BRIDGE_ISA);
205
206	lpc_bridge = pi;
207
208	return (0);
209}
210
211struct pci_devemu pci_de_lpc = {
212	.pe_emu =	"lpc",
213	.pe_init =	pci_lpc_init,
214	.pe_barwrite =	pci_lpc_write,
215	.pe_barread =	pci_lpc_read
216};
217PCI_EMUL_SET(pci_de_lpc);
218