1 /*-
2 * Copyright (c) 2016 Michael Zhilin <mizhka@gmail.com>
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: releng/11.2/sys/mips/broadcom/uart_cpu_chipc.c 302190 2016-06-25 04:34:54Z landonf $");
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 }
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