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 { 105 struct acpi_uart_compat_data *cd; 106 ACPI_TABLE_SPCR *spcr; 107 vm_paddr_t spcr_physaddr; 108 int err; 109 110 err = ENXIO; 111 spcr_physaddr = acpi_find_table(ACPI_SIG_SPCR); 112 if (spcr_physaddr == 0) 113 return (ENXIO); 114 115 spcr = acpi_map_table(spcr_physaddr, ACPI_SIG_SPCR); 116 117 cd = uart_cpu_acpi_scan(spcr->InterfaceType); 118 if (cd == NULL) 119 goto out; 120 121 switch(spcr->BaudRate) { 122 case 3: 123 *baud = 9600; 124 break; 125 case 4: 126 *baud = 19200; 127 break; 128 case 6: 129 *baud = 57600; 130 break; 131 case 7: 132 *baud = 115200; 133 break; 134 default: 135 goto out; 136 } 137 138 err = acpi_map_addr(&spcr->SerialPort, bst, bsh, PAGE_SIZE); 139 if (err != 0) 140 goto out; 141 142 *classp = cd->clas; 143 *rclk = 0; 144 *shiftp = 2; 145 146 out: 147 acpi_unmap_table(spcr); 148 return (err); 149 } 150 #endif 151 152 int 153 uart_cpu_getdev(int devtype, struct uart_devinfo *di) 154 { 155 struct uart_class *class; 156 bus_space_handle_t bsh; 157 bus_space_tag_t bst; 158 u_int rclk, shift; 159 int br, err; 160 161 /* Allow overriding the FDT using the environment. */ 162 class = &uart_ns8250_class; 163 err = uart_getenv(devtype, di, class); 164 if (err == 0) 165 return (0); 166 167 if (devtype != UART_DEV_CONSOLE) 168 return (ENXIO); 169 170 err = ENXIO; 171 #ifdef DEV_ACPI 172 err = uart_cpu_acpi_probe(&class, &bst, &bsh, &br, &rclk, &shift); 173 #endif 174 #ifdef FDT 175 if (err != 0) { 176 err = uart_cpu_fdt_probe(&class, &bst, &bsh, &br, &rclk, 177 &shift); 178 } 179 #endif 180 if (err != 0) 181 return (err); 182 183 /* 184 * Finalize configuration. 185 */ 186 di->bas.chan = 0; 187 di->bas.regshft = shift; 188 di->baudrate = br; 189 di->bas.rclk = rclk; 190 di->ops = uart_getops(class); 191 di->databits = 8; 192 di->stopbits = 1; 193 di->parity = UART_PARITY_NONE; 194 di->bas.bst = bst; 195 di->bas.bsh = bsh; 196 uart_bus_space_mem = di->bas.bst; 197 uart_bus_space_io = NULL; 198 199 return (0); 200 } 201