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 extern struct bus_space memmap_bus; 69 bus_space_tag_t uart_bus_space_io; 70 bus_space_tag_t uart_bus_space_mem = &memmap_bus; 71 72 int 73 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2) 74 { 75 76 if (pmap_kextract(b1->bsh) == 0) 77 return (0); 78 if (pmap_kextract(b2->bsh) == 0) 79 return (0); 80 return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0); 81 } 82 83 #ifdef DEV_ACPI 84 static struct acpi_uart_compat_data * 85 uart_cpu_acpi_scan(uint8_t interface_type) 86 { 87 struct acpi_uart_compat_data **cd, *curcd; 88 int i; 89 90 SET_FOREACH(cd, uart_acpi_class_and_device_set) { 91 curcd = *cd; 92 for (i = 0; curcd[i].cd_hid != NULL; i++) { 93 if (curcd[i].cd_port_subtype == interface_type) 94 return (&curcd[i]); 95 } 96 } 97 98 SET_FOREACH(cd, uart_acpi_class_set) { 99 curcd = *cd; 100 for (i = 0; curcd[i].cd_hid != NULL; i++) { 101 if (curcd[i].cd_port_subtype == interface_type) 102 return (&curcd[i]); 103 } 104 } 105 106 return (NULL); 107 } 108 109 static int 110 uart_cpu_acpi_probe(struct uart_class **classp, bus_space_tag_t *bst, 111 bus_space_handle_t *bsh, int *baud, u_int *rclk, u_int *shiftp, 112 u_int *iowidthp) 113 { 114 struct acpi_uart_compat_data *cd; 115 ACPI_TABLE_SPCR *spcr; 116 vm_paddr_t spcr_physaddr; 117 int err; 118 119 err = ENXIO; 120 spcr_physaddr = acpi_find_table(ACPI_SIG_SPCR); 121 if (spcr_physaddr == 0) 122 return (ENXIO); 123 124 spcr = acpi_map_table(spcr_physaddr, ACPI_SIG_SPCR); 125 126 cd = uart_cpu_acpi_scan(spcr->InterfaceType); 127 if (cd == NULL) 128 goto out; 129 130 switch(spcr->BaudRate) { 131 case 3: 132 *baud = 9600; 133 break; 134 case 4: 135 *baud = 19200; 136 break; 137 case 6: 138 *baud = 57600; 139 break; 140 case 7: 141 *baud = 115200; 142 break; 143 default: 144 goto out; 145 } 146 147 err = acpi_map_addr(&spcr->SerialPort, bst, bsh, PAGE_SIZE); 148 if (err != 0) 149 goto out; 150 151 *classp = cd->cd_class; 152 *rclk = 0; 153 *shiftp = spcr->SerialPort.AccessWidth - 1; 154 *iowidthp = spcr->SerialPort.BitWidth / 8; 155 156 if ((cd->cd_quirks & UART_F_IGNORE_SPCR_REGSHFT) == 157 UART_F_IGNORE_SPCR_REGSHFT) { 158 *shiftp = cd->cd_regshft; 159 } 160 161 out: 162 acpi_unmap_table(spcr); 163 return (err); 164 } 165 #endif 166 167 int 168 uart_cpu_getdev(int devtype, struct uart_devinfo *di) 169 { 170 struct uart_class *class; 171 bus_space_handle_t bsh; 172 bus_space_tag_t bst; 173 u_int rclk, shift, iowidth; 174 int br, err; 175 176 /* Allow overriding the FDT using the environment. */ 177 class = &uart_ns8250_class; 178 err = uart_getenv(devtype, di, class); 179 if (err == 0) 180 return (0); 181 182 if (devtype != UART_DEV_CONSOLE) 183 return (ENXIO); 184 185 err = ENXIO; 186 #ifdef DEV_ACPI 187 err = uart_cpu_acpi_probe(&class, &bst, &bsh, &br, &rclk, &shift, 188 &iowidth); 189 #endif 190 #ifdef FDT 191 if (err != 0) { 192 err = uart_cpu_fdt_probe(&class, &bst, &bsh, &br, &rclk, 193 &shift, &iowidth); 194 } 195 #endif 196 if (err != 0) 197 return (err); 198 199 /* 200 * Finalize configuration. 201 */ 202 di->bas.chan = 0; 203 di->bas.regshft = shift; 204 di->bas.regiowidth = iowidth; 205 di->baudrate = br; 206 di->bas.rclk = rclk; 207 di->ops = uart_getops(class); 208 di->databits = 8; 209 di->stopbits = 1; 210 di->parity = UART_PARITY_NONE; 211 di->bas.bst = bst; 212 di->bas.bsh = bsh; 213 uart_bus_space_mem = di->bas.bst; 214 uart_bus_space_io = NULL; 215 216 return (0); 217 } 218