1 /*-
2 * Copyright (c) 2016 The FreeBSD Foundation
3 *
4 * This software was developed by Andrew Turner under sponsorship from
5 * the FreeBSD Foundation.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include "opt_acpi.h"
30 #include "opt_platform.h"
31
32 #include <sys/cdefs.h>
33 #include <sys/param.h>
34 #include <sys/bus.h>
35 #include <sys/kernel.h>
36 #include <sys/module.h>
37 #include <sys/systm.h>
38
39 #include <vm/vm.h>
40 #include <vm/pmap.h>
41
42 #include <machine/bus.h>
43
44 #include <dev/uart/uart.h>
45 #include <dev/uart/uart_bus.h>
46 #include <dev/uart/uart_cpu.h>
47
48 #ifdef DEV_ACPI
49 #include <contrib/dev/acpica/include/acpi.h>
50 #include <contrib/dev/acpica/include/accommon.h>
51 #include <contrib/dev/acpica/include/actables.h>
52 #include <dev/uart/uart_cpu_acpi.h>
53 #endif
54
55 #ifdef FDT
56 #include <dev/fdt/fdt_common.h>
57 #include <dev/ofw/ofw_bus.h>
58 #include <dev/ofw/ofw_bus_subr.h>
59 #include <dev/uart/uart_cpu_fdt.h>
60 #endif
61
62 /*
63 * UART console routines.
64 */
65 extern struct bus_space memmap_bus;
66 bus_space_tag_t uart_bus_space_io;
67 bus_space_tag_t uart_bus_space_mem = &memmap_bus;
68
69 int
uart_cpu_eqres(struct uart_bas * b1,struct uart_bas * b2)70 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
71 {
72
73 if (pmap_kextract(b1->bsh) == 0)
74 return (0);
75 if (pmap_kextract(b2->bsh) == 0)
76 return (0);
77 return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0);
78 }
79
80 #ifdef FDT
81 static int
uart_cpu_fdt_setup(struct uart_class * class,int devtype,struct uart_devinfo * di)82 uart_cpu_fdt_setup(struct uart_class *class, int devtype, struct uart_devinfo *di)
83 {
84 bus_space_handle_t bsh;
85 bus_space_tag_t bst;
86 u_int rclk, shift, iowidth;
87 int br, err;
88
89 err = uart_cpu_fdt_probe(&class, &bst, &bsh, &br, &rclk,
90 &shift, &iowidth, devtype);
91 if (err != 0)
92 return (err);
93
94 /*
95 * Finalize configuration.
96 */
97 di->bas.chan = 0;
98 di->bas.regshft = shift;
99 di->bas.regiowidth = iowidth;
100 di->baudrate = br;
101 di->bas.rclk = rclk;
102 di->ops = uart_getops(class);
103 di->databits = 8;
104 di->stopbits = 1;
105 di->parity = UART_PARITY_NONE;
106 di->bas.bst = bst;
107 di->bas.bsh = bsh;
108 uart_bus_space_mem = di->bas.bst;
109 uart_bus_space_io = NULL;
110
111 return (0);
112 }
113 #endif
114
115 int
uart_cpu_getdev(int devtype,struct uart_devinfo * di)116 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
117 {
118 struct uart_class *class;
119 int err;
120
121 /* Allow overriding ACPI/FDT using the environment. */
122 class = &uart_ns8250_class;
123 err = uart_getenv(devtype, di, class);
124 if (err == 0)
125 return (0);
126
127 #ifdef DEV_ACPI
128 /* Check if SPCR can tell us what console to use. */
129 if (uart_cpu_acpi_spcr(devtype, di) == 0)
130 return (0);
131 #endif
132 #ifdef FDT
133 if (uart_cpu_fdt_setup(class, devtype, di) == 0)
134 return (0);
135 #endif
136
137 return (ENXIO);
138 }
139