1 /*- 2 * Copyright (c) 2016 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Andrew Turner under sponsorship from 6 * the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include "opt_acpi.h" 31 #include "opt_platform.h" 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <sys/param.h> 37 #include <sys/bus.h> 38 #include <sys/kernel.h> 39 #include <sys/module.h> 40 #include <sys/systm.h> 41 42 #include <vm/vm.h> 43 #include <vm/pmap.h> 44 45 #include <machine/bus.h> 46 47 #include <dev/uart/uart.h> 48 #include <dev/uart/uart_bus.h> 49 #include <dev/uart/uart_cpu.h> 50 51 #ifdef DEV_ACPI 52 #include <contrib/dev/acpica/include/acpi.h> 53 #include <contrib/dev/acpica/include/accommon.h> 54 #include <contrib/dev/acpica/include/actables.h> 55 #include <dev/uart/uart_cpu_acpi.h> 56 #endif 57 58 #ifdef FDT 59 #include <dev/fdt/fdt_common.h> 60 #include <dev/ofw/ofw_bus.h> 61 #include <dev/ofw/ofw_bus_subr.h> 62 #include <dev/uart/uart_cpu_fdt.h> 63 #endif 64 65 /* 66 * UART console routines. 67 */ 68 bus_space_tag_t uart_bus_space_io; 69 bus_space_tag_t uart_bus_space_mem; 70 71 int 72 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2) 73 { 74 75 if (pmap_kextract(b1->bsh) == 0) 76 return (0); 77 if (pmap_kextract(b2->bsh) == 0) 78 return (0); 79 return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0); 80 } 81 82 #ifdef DEV_ACPI 83 static struct acpi_uart_compat_data * 84 uart_cpu_acpi_scan(uint8_t interface_type) 85 { 86 struct acpi_uart_compat_data **cd; 87 88 SET_FOREACH(cd, uart_acpi_class_and_device_set) { 89 if ((*cd)->port_subtype == interface_type) 90 return (*cd); 91 } 92 93 SET_FOREACH(cd, uart_acpi_class_set) { 94 if ((*cd)->port_subtype == interface_type) 95 return (*cd); 96 } 97 98 return (NULL); 99 } 100 101 static int 102 uart_cpu_acpi_probe(struct uart_class **classp, bus_space_tag_t *bst, 103 bus_space_handle_t *bsh, int *baud, u_int *rclk, u_int *shiftp, 104 u_int *iowidthp) 105 { 106 struct acpi_uart_compat_data *cd; 107 ACPI_TABLE_SPCR *spcr; 108 vm_paddr_t spcr_physaddr; 109 int err; 110 111 err = ENXIO; 112 spcr_physaddr = acpi_find_table(ACPI_SIG_SPCR); 113 if (spcr_physaddr == 0) 114 return (ENXIO); 115 116 spcr = acpi_map_table(spcr_physaddr, ACPI_SIG_SPCR); 117 118 cd = uart_cpu_acpi_scan(spcr->InterfaceType); 119 if (cd == NULL) 120 goto out; 121 122 switch(spcr->BaudRate) { 123 case 3: 124 *baud = 9600; 125 break; 126 case 4: 127 *baud = 19200; 128 break; 129 case 6: 130 *baud = 57600; 131 break; 132 case 7: 133 *baud = 115200; 134 break; 135 default: 136 goto out; 137 } 138 139 err = acpi_map_addr(&spcr->SerialPort, bst, bsh, PAGE_SIZE); 140 if (err != 0) 141 goto out; 142 143 *classp = cd->clas; 144 *rclk = 0; 145 *shiftp = 2; 146 *iowidthp = spcr->SerialPort.BitWidth / 8; 147 148 out: 149 acpi_unmap_table(spcr); 150 return (err); 151 } 152 #endif 153 154 int 155 uart_cpu_getdev(int devtype, struct uart_devinfo *di) 156 { 157 struct uart_class *class; 158 bus_space_handle_t bsh; 159 bus_space_tag_t bst; 160 u_int rclk, shift, iowidth; 161 int br, err; 162 163 /* Allow overriding the FDT using the environment. */ 164 class = &uart_ns8250_class; 165 err = uart_getenv(devtype, di, class); 166 if (err == 0) 167 return (0); 168 169 if (devtype != UART_DEV_CONSOLE) 170 return (ENXIO); 171 172 err = ENXIO; 173 #ifdef DEV_ACPI 174 err = uart_cpu_acpi_probe(&class, &bst, &bsh, &br, &rclk, &shift, 175 &iowidth); 176 #endif 177 #ifdef FDT 178 if (err != 0) { 179 err = uart_cpu_fdt_probe(&class, &bst, &bsh, &br, &rclk, 180 &shift, &iowidth); 181 } 182 #endif 183 if (err != 0) 184 return (err); 185 186 /* 187 * Finalize configuration. 188 */ 189 di->bas.chan = 0; 190 di->bas.regshft = shift; 191 di->bas.regiowidth = iowidth; 192 di->baudrate = br; 193 di->bas.rclk = rclk; 194 di->ops = uart_getops(class); 195 di->databits = 8; 196 di->stopbits = 1; 197 di->parity = UART_PARITY_NONE; 198 di->bas.bst = bst; 199 di->bas.bsh = bsh; 200 uart_bus_space_mem = di->bas.bst; 201 uart_bus_space_io = NULL; 202 203 return (0); 204 } 205