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, *curcd; 87 int i; 88 89 SET_FOREACH(cd, uart_acpi_class_and_device_set) { 90 curcd = *cd; 91 for (i = 0; curcd[i].cd_hid != NULL; i++) { 92 if (curcd[i].cd_port_subtype == interface_type) 93 return (&curcd[i]); 94 } 95 } 96 97 SET_FOREACH(cd, uart_acpi_class_set) { 98 curcd = *cd; 99 for (i = 0; curcd[i].cd_hid != NULL; i++) { 100 if (curcd[i].cd_port_subtype == interface_type) 101 return (&curcd[i]); 102 } 103 } 104 105 return (NULL); 106 } 107 108 static int 109 uart_cpu_acpi_probe(struct uart_class **classp, bus_space_tag_t *bst, 110 bus_space_handle_t *bsh, int *baud, u_int *rclk, u_int *shiftp, 111 u_int *iowidthp) 112 { 113 struct acpi_uart_compat_data *cd; 114 ACPI_TABLE_SPCR *spcr; 115 vm_paddr_t spcr_physaddr; 116 int err; 117 118 err = ENXIO; 119 spcr_physaddr = acpi_find_table(ACPI_SIG_SPCR); 120 if (spcr_physaddr == 0) 121 return (ENXIO); 122 123 spcr = acpi_map_table(spcr_physaddr, ACPI_SIG_SPCR); 124 125 cd = uart_cpu_acpi_scan(spcr->InterfaceType); 126 if (cd == NULL) 127 goto out; 128 129 switch(spcr->BaudRate) { 130 case 3: 131 *baud = 9600; 132 break; 133 case 4: 134 *baud = 19200; 135 break; 136 case 6: 137 *baud = 57600; 138 break; 139 case 7: 140 *baud = 115200; 141 break; 142 default: 143 goto out; 144 } 145 146 err = acpi_map_addr(&spcr->SerialPort, bst, bsh, PAGE_SIZE); 147 if (err != 0) 148 goto out; 149 150 *classp = cd->cd_class; 151 *rclk = 0; 152 *shiftp = 2; 153 *iowidthp = spcr->SerialPort.BitWidth / 8; 154 155 out: 156 acpi_unmap_table(spcr); 157 return (err); 158 } 159 #endif 160 161 int 162 uart_cpu_getdev(int devtype, struct uart_devinfo *di) 163 { 164 struct uart_class *class; 165 bus_space_handle_t bsh; 166 bus_space_tag_t bst; 167 u_int rclk, shift, iowidth; 168 int br, err; 169 170 /* Allow overriding the FDT using the environment. */ 171 class = &uart_ns8250_class; 172 err = uart_getenv(devtype, di, class); 173 if (err == 0) 174 return (0); 175 176 if (devtype != UART_DEV_CONSOLE) 177 return (ENXIO); 178 179 err = ENXIO; 180 #ifdef DEV_ACPI 181 err = uart_cpu_acpi_probe(&class, &bst, &bsh, &br, &rclk, &shift, 182 &iowidth); 183 #endif 184 #ifdef FDT 185 if (err != 0) { 186 err = uart_cpu_fdt_probe(&class, &bst, &bsh, &br, &rclk, 187 &shift, &iowidth); 188 } 189 #endif 190 if (err != 0) 191 return (err); 192 193 /* 194 * Finalize configuration. 195 */ 196 di->bas.chan = 0; 197 di->bas.regshft = shift; 198 di->bas.regiowidth = iowidth; 199 di->baudrate = br; 200 di->bas.rclk = rclk; 201 di->ops = uart_getops(class); 202 di->databits = 8; 203 di->stopbits = 1; 204 di->parity = UART_PARITY_NONE; 205 di->bas.bst = bst; 206 di->bas.bsh = bsh; 207 uart_bus_space_mem = di->bas.bst; 208 uart_bus_space_io = NULL; 209 210 return (0); 211 } 212