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/param.h>
30 #include <sys/systm.h>
31 #include <vm/vm.h>
32 #include <vm/pmap.h>
33
34 #include <machine/bus.h>
35 #include <machine/ofw_machdep.h>
36
37 #include <dev/ofw/ofw_bus_subr.h>
38 #include <dev/ofw/openfirm.h>
39 #include <dev/uart/uart.h>
40 #include <dev/uart/uart_cpu.h>
41
42 bus_space_tag_t uart_bus_space_io = &bs_le_tag;
43 bus_space_tag_t uart_bus_space_mem = &bs_le_tag;
44
45 int
uart_cpu_eqres(struct uart_bas * b1,struct uart_bas * b2)46 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
47 {
48
49 return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0);
50 }
51
52 static int
ofw_get_uart_console(phandle_t opts,phandle_t * result,const char * inputdev,const char * outputdev)53 ofw_get_uart_console(phandle_t opts, phandle_t *result, const char *inputdev,
54 const char *outputdev)
55 {
56 char buf[64];
57 phandle_t input;
58
59 if (OF_getprop(opts, inputdev, buf, sizeof(buf)) == -1)
60 return (ENXIO);
61 input = OF_finddevice(buf);
62 if (input == -1)
63 return (ENXIO);
64
65 if (outputdev != NULL) {
66 if (OF_getprop(opts, outputdev, buf, sizeof(buf)) == -1)
67 return (ENXIO);
68 if (OF_finddevice(buf) != input)
69 return (ENXIO);
70 }
71
72 *result = input;
73 return (0);
74 }
75
76 static int
ofw_get_console_phandle_path(phandle_t node,phandle_t * result,const char * prop)77 ofw_get_console_phandle_path(phandle_t node, phandle_t *result,
78 const char *prop)
79 {
80 union {
81 char buf[64];
82 phandle_t ref;
83 } field;
84 phandle_t output;
85 ssize_t size;
86
87 size = OF_getproplen(node, prop);
88 if (size == -1)
89 return (ENXIO);
90 OF_getprop(node, prop, &field, sizeof(field));
91
92 /* This property might be either a ihandle or path. Hooray. */
93
94 output = -1;
95 if (field.buf[size - 1] == 0)
96 output = OF_finddevice(field.buf);
97 if (output == -1 && size == 4)
98 output = OF_instance_to_package(field.ref);
99
100 if (output != -1) {
101 *result = output;
102 return (0);
103 }
104
105 return (ENXIO);
106 }
107
108 int
uart_cpu_getdev(int devtype,struct uart_devinfo * di)109 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
110 {
111 char buf[64];
112 struct uart_class *class;
113 phandle_t input, opts, chosen;
114 int error;
115
116 opts = OF_finddevice("/options");
117 chosen = OF_finddevice("/chosen");
118 switch (devtype) {
119 case UART_DEV_CONSOLE:
120 error = ENXIO;
121 if (chosen != -1 && error != 0)
122 error = ofw_get_uart_console(chosen, &input,
123 "stdout-path", NULL);
124 if (chosen != -1 && error != 0)
125 error = ofw_get_uart_console(chosen, &input,
126 "linux,stdout-path", NULL);
127 if (chosen != -1 && error != 0)
128 error = ofw_get_console_phandle_path(chosen, &input,
129 "stdout");
130 if (chosen != -1 && error != 0)
131 error = ofw_get_uart_console(chosen, &input,
132 "stdin-path", NULL);
133 if (chosen != -1 && error != 0)
134 error = ofw_get_console_phandle_path(chosen, &input,
135 "stdin");
136 if (opts != -1 && error != 0)
137 error = ofw_get_uart_console(opts, &input,
138 "input-device", "output-device");
139 if (opts != -1 && error != 0)
140 error = ofw_get_uart_console(opts, &input,
141 "input-device-1", "output-device-1");
142 if (error != 0) {
143 input = OF_finddevice("serial0"); /* Last ditch */
144 if (input == -1)
145 error = (ENXIO);
146 }
147
148 if (error != 0)
149 return (error);
150 break;
151 case UART_DEV_DBGPORT:
152 if (!getenv_string("hw.uart.dbgport", buf, sizeof(buf)))
153 return (ENXIO);
154 input = OF_finddevice(buf);
155 if (input == -1)
156 return (ENXIO);
157 break;
158 default:
159 return (EINVAL);
160 }
161
162 if (OF_getprop(input, "device_type", buf, sizeof(buf)) == -1)
163 return (ENXIO);
164 if (strcmp(buf, "serial") != 0)
165 return (ENXIO);
166
167 if (ofw_bus_node_is_compatible(input, "chrp,es")) {
168 class = &uart_z8530_class;
169 di->bas.regshft = 4;
170 di->bas.chan = 1;
171 } else if (ofw_bus_node_is_compatible(input,"ns16550") ||
172 ofw_bus_node_is_compatible(input,"ns8250")) {
173 class = &uart_ns8250_class;
174 di->bas.regshft = 0;
175 di->bas.chan = 0;
176 } else
177 return (ENXIO);
178
179 if (class == NULL)
180 return (ENXIO);
181
182 error = OF_decode_addr(input, 0, &di->bas.bst, &di->bas.bsh, NULL);
183 if (error)
184 return (error);
185
186 di->ops = uart_getops(class);
187
188 if (OF_getprop(input, "clock-frequency", &di->bas.rclk,
189 sizeof(di->bas.rclk)) == -1)
190 di->bas.rclk = 230400;
191 if (OF_getprop(input, "current-speed", &di->baudrate,
192 sizeof(di->baudrate)) == -1)
193 di->baudrate = 0;
194 OF_getprop(input, "reg-shift", &di->bas.regshft,
195 sizeof(di->bas.regshft));
196
197 di->databits = 8;
198 di->stopbits = 1;
199 di->parity = UART_PARITY_NONE;
200 return (0);
201 }
202