uart_cpu_chipc.c revision 302190
197403Sobrien/*- 297403Sobrien * Copyright (c) 2016 Michael Zhilin <mizhka@gmail.com> 397403Sobrien * 497403Sobrien * All rights reserved. 597403Sobrien * 697403Sobrien * Redistribution and use in source and binary forms, with or without 797403Sobrien * modification, are permitted provided that the following conditions 897403Sobrien * are met: 997403Sobrien * 1. Redistributions of source code must retain the above copyright 1097403Sobrien * notice, this list of conditions and the following disclaimer. 1197403Sobrien * 2. Redistributions in binary form must reproduce the above copyright 1297403Sobrien * notice, this list of conditions and the following disclaimer in the 1397403Sobrien * documentation and/or other materials provided with the distribution. 1497403Sobrien * 1597403Sobrien * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1697403Sobrien * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1797403Sobrien * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1897403Sobrien * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1997403Sobrien * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2097403Sobrien * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2197403Sobrien * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2297403Sobrien * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2397403Sobrien * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2497403Sobrien * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2597403Sobrien * SUCH DAMAGE. 2697403Sobrien */ 2797403Sobrien 2897403Sobrien#include <sys/cdefs.h> 2997403Sobrien__FBSDID("$FreeBSD: head/sys/mips/broadcom/uart_cpu_chipc.c 302190 2016-06-25 04:34:54Z landonf $"); 3097403Sobrien 3197403Sobrien#include "opt_uart.h" 3297403Sobrien 3397403Sobrien#include <sys/param.h> 3497403Sobrien#include <sys/systm.h> 3597403Sobrien#include <sys/bus.h> 3697403Sobrien#include <sys/cons.h> 3797403Sobrien#include <sys/lock.h> 38#include <sys/mutex.h> 39 40#include <machine/bus.h> 41 42#include <dev/bhnd/cores/chipc/chipcreg.h> 43 44#include <dev/uart/uart.h> 45#include <dev/uart/uart_bus.h> 46#include <dev/uart/uart_cpu.h> 47 48#include "bcm_socinfo.h" 49 50bus_space_tag_t uart_bus_space_io; 51bus_space_tag_t uart_bus_space_mem; 52 53static struct uart_class *chipc_uart_class = &uart_ns8250_class; 54 55#define CHIPC_UART_BAUDRATE 115200 56 57int 58uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2) 59{ 60 return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0); 61} 62 63static int 64uart_cpu_init(struct uart_devinfo *di, int uart, int baudrate) 65{ 66 struct bcm_socinfo *socinfo; 67 68 if (uart >= CHIPC_UART_MAX) 69 return (EINVAL); 70 71 socinfo = bcm_get_socinfo(); 72 di->ops = uart_getops(chipc_uart_class); 73 di->bas.chan = 0; 74 di->bas.bst = uart_bus_space_mem; 75 di->bas.bsh = (bus_space_handle_t) BCM_SOCREG(CHIPC_UART(uart)); 76 di->bas.regshft = 0; 77 di->bas.rclk = socinfo->uartrate; /* in Hz */ 78 di->baudrate = baudrate; 79 di->databits = 8; 80 di->stopbits = 1; 81 di->parity = UART_PARITY_NONE; 82 83 return (0); 84} 85 86int 87uart_cpu_getdev(int devtype, struct uart_devinfo *di) 88{ 89 int ivar; 90 91 uart_bus_space_io = NULL; 92 uart_bus_space_mem = mips_bus_space_generic; 93 94 /* Check the environment. */ 95 if (uart_getenv(devtype, di, chipc_uart_class) == 0) 96 return (0); 97 98 /* Scan the device hints for the first matching device */ 99 for (int i = 0; i < CHIPC_UART_MAX; i++) { 100 if (resource_int_value("uart", i, "flags", &ivar)) 101 continue; 102 103 /* Check usability */ 104 if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(ivar)) 105 continue; 106 107 if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(ivar)) 108 continue; 109 110 if (resource_int_value("uart", i, "disabled", &ivar) == 0 && 111 ivar == 0) 112 continue; 113 114 /* Found */ 115 if (resource_int_value("uart", i, "baud", &ivar) != 0) 116 ivar = CHIPC_UART_BAUDRATE; 117 118 return (uart_cpu_init(di, i, ivar)); 119 } 120 121 /* Default to uart0/115200 */ 122 return (uart_cpu_init(di, 0, CHIPC_UART_BAUDRATE)); 123} 124