1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2006 Marcel Moolenaar
5 * All rights reserved.
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 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <vm/vm.h>
33 #include <vm/pmap.h>
34
35 #include <machine/bus.h>
36 #include <machine/ofw_machdep.h>
37
38 #include <dev/ofw/ofw_bus_subr.h>
39 #include <dev/ofw/openfirm.h>
40 #include <dev/uart/uart.h>
41 #include <dev/uart/uart_cpu.h>
42
43 bus_space_tag_t uart_bus_space_io = &bs_le_tag;
44 bus_space_tag_t uart_bus_space_mem = &bs_le_tag;
45
46 int
uart_cpu_eqres(struct uart_bas * b1,struct uart_bas * b2)47 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
48 {
49
50 return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0);
51 }
52
53 static int
ofw_get_uart_console(phandle_t opts,phandle_t * result,const char * inputdev,const char * outputdev)54 ofw_get_uart_console(phandle_t opts, phandle_t *result, const char *inputdev,
55 const char *outputdev)
56 {
57 char buf[64];
58 phandle_t input;
59
60 if (OF_getprop(opts, inputdev, buf, sizeof(buf)) == -1)
61 return (ENXIO);
62 input = OF_finddevice(buf);
63 if (input == -1)
64 return (ENXIO);
65
66 if (outputdev != NULL) {
67 if (OF_getprop(opts, outputdev, buf, sizeof(buf)) == -1)
68 return (ENXIO);
69 if (OF_finddevice(buf) != input)
70 return (ENXIO);
71 }
72
73 *result = input;
74 return (0);
75 }
76
77 static int
ofw_get_console_phandle_path(phandle_t node,phandle_t * result,const char * prop)78 ofw_get_console_phandle_path(phandle_t node, phandle_t *result,
79 const char *prop)
80 {
81 union {
82 char buf[64];
83 phandle_t ref;
84 } field;
85 phandle_t output;
86 ssize_t size;
87
88 size = OF_getproplen(node, prop);
89 if (size == -1)
90 return (ENXIO);
91 OF_getprop(node, prop, &field, sizeof(field));
92
93 /* This property might be either a ihandle or path. Hooray. */
94
95 output = -1;
96 if (field.buf[size - 1] == 0)
97 output = OF_finddevice(field.buf);
98 if (output == -1 && size == 4)
99 output = OF_instance_to_package(field.ref);
100
101 if (output != -1) {
102 *result = output;
103 return (0);
104 }
105
106 return (ENXIO);
107 }
108
109 int
uart_cpu_getdev(int devtype,struct uart_devinfo * di)110 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
111 {
112 char buf[64];
113 struct uart_class *class;
114 phandle_t input, opts, chosen;
115 int error;
116
117 opts = OF_finddevice("/options");
118 chosen = OF_finddevice("/chosen");
119 switch (devtype) {
120 case UART_DEV_CONSOLE:
121 error = ENXIO;
122 if (chosen != -1 && error != 0)
123 error = ofw_get_uart_console(chosen, &input,
124 "stdout-path", NULL);
125 if (chosen != -1 && error != 0)
126 error = ofw_get_uart_console(chosen, &input,
127 "linux,stdout-path", NULL);
128 if (chosen != -1 && error != 0)
129 error = ofw_get_console_phandle_path(chosen, &input,
130 "stdout");
131 if (chosen != -1 && error != 0)
132 error = ofw_get_uart_console(chosen, &input,
133 "stdin-path", NULL);
134 if (chosen != -1 && error != 0)
135 error = ofw_get_console_phandle_path(chosen, &input,
136 "stdin");
137 if (opts != -1 && error != 0)
138 error = ofw_get_uart_console(opts, &input,
139 "input-device", "output-device");
140 if (opts != -1 && error != 0)
141 error = ofw_get_uart_console(opts, &input,
142 "input-device-1", "output-device-1");
143 if (error != 0) {
144 input = OF_finddevice("serial0"); /* Last ditch */
145 if (input == -1)
146 error = (ENXIO);
147 }
148
149 if (error != 0)
150 return (error);
151 break;
152 case UART_DEV_DBGPORT:
153 if (!getenv_string("hw.uart.dbgport", buf, sizeof(buf)))
154 return (ENXIO);
155 input = OF_finddevice(buf);
156 if (input == -1)
157 return (ENXIO);
158 break;
159 default:
160 return (EINVAL);
161 }
162
163 if (OF_getprop(input, "device_type", buf, sizeof(buf)) == -1)
164 return (ENXIO);
165 if (strcmp(buf, "serial") != 0)
166 return (ENXIO);
167
168 if (ofw_bus_node_is_compatible(input, "chrp,es")) {
169 class = &uart_z8530_class;
170 di->bas.regshft = 4;
171 di->bas.chan = 1;
172 } else if (ofw_bus_node_is_compatible(input,"ns16550") ||
173 ofw_bus_node_is_compatible(input,"ns8250")) {
174 class = &uart_ns8250_class;
175 di->bas.regshft = 0;
176 di->bas.chan = 0;
177 } else
178 return (ENXIO);
179
180 if (class == NULL)
181 return (ENXIO);
182
183 error = OF_decode_addr(input, 0, &di->bas.bst, &di->bas.bsh, NULL);
184 if (error)
185 return (error);
186
187 di->ops = uart_getops(class);
188
189 if (OF_getprop(input, "clock-frequency", &di->bas.rclk,
190 sizeof(di->bas.rclk)) == -1)
191 di->bas.rclk = 230400;
192 if (OF_getprop(input, "current-speed", &di->baudrate,
193 sizeof(di->baudrate)) == -1)
194 di->baudrate = 0;
195 OF_getprop(input, "reg-shift", &di->bas.regshft,
196 sizeof(di->bas.regshft));
197
198 di->databits = 8;
199 di->stopbits = 1;
200 di->parity = UART_PARITY_NONE;
201 return (0);
202 }
203