1 /*- 2 * Copyright (c) 2016 Michael Zhilin <[email protected]> 3 * 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include "opt_uart.h" 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/bus.h> 36 #include <sys/cons.h> 37 #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 50 bus_space_tag_t uart_bus_space_io; 51 bus_space_tag_t uart_bus_space_mem; 52 53 static struct uart_class *chipc_uart_class = &uart_ns8250_class; 54 55 #define CHIPC_UART_BAUDRATE 115200 56 57 int 58 uart_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 63 static int 64 uart_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 86 int 87 uart_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