1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2009-2010 The FreeBSD Foundation 5 * All rights reserved. 6 * 7 * This software was developed by Semihalf under sponsorship from 8 * the FreeBSD Foundation. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include "opt_platform.h" 36 37 #include <sys/param.h> 38 #include <sys/bus.h> 39 #include <sys/kernel.h> 40 #include <sys/module.h> 41 #include <sys/systm.h> 42 43 #include <vm/vm.h> 44 #include <vm/pmap.h> 45 46 #include <machine/bus.h> 47 48 #include <dev/fdt/fdt_common.h> 49 #include <dev/ofw/ofw_bus.h> 50 #include <dev/ofw/ofw_bus_subr.h> 51 #include <dev/uart/uart.h> 52 #include <dev/uart/uart_bus.h> 53 #include <dev/uart/uart_cpu.h> 54 #include <dev/uart/uart_cpu_fdt.h> 55 56 /* 57 * UART console routines. 58 */ 59 bus_space_tag_t uart_bus_space_io; 60 bus_space_tag_t uart_bus_space_mem; 61 62 int 63 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2) 64 { 65 66 if (b1->bst != b2->bst) 67 return (0); 68 if (pmap_kextract(b1->bsh) == 0) 69 return (0); 70 if (pmap_kextract(b2->bsh) == 0) 71 return (0); 72 return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0); 73 } 74 75 int 76 uart_cpu_getdev(int devtype, struct uart_devinfo *di) 77 { 78 struct uart_class *class; 79 bus_space_tag_t bst; 80 bus_space_handle_t bsh; 81 u_int shift, iowidth, rclk; 82 int br, err; 83 84 /* Allow overriding the FDT using the environment. */ 85 class = &uart_ns8250_class; 86 err = uart_getenv(devtype, di, class); 87 if (!err) 88 return (0); 89 90 if (devtype != UART_DEV_CONSOLE) 91 return (ENXIO); 92 93 err = uart_cpu_fdt_probe(&class, &bst, &bsh, &br, &rclk, &shift, &iowidth); 94 if (err != 0) 95 return (err); 96 97 /* 98 * Finalize configuration. 99 */ 100 di->bas.chan = 0; 101 di->bas.regshft = shift; 102 di->bas.regiowidth = iowidth; 103 di->baudrate = br; 104 di->bas.rclk = rclk; 105 di->ops = uart_getops(class); 106 di->databits = 8; 107 di->stopbits = 1; 108 di->parity = UART_PARITY_NONE; 109 di->bas.bst = bst; 110 di->bas.bsh = bsh; 111 112 uart_bus_space_mem = di->bas.bst; 113 uart_bus_space_io = NULL; 114 115 return (err); 116 } 117