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 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 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 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 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 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 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 static const 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