uart_cpu_powerpc.c revision 308373 
1/*-
2 * Copyright (c) 2006 Marcel Moolenaar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
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 ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/11/sys/dev/uart/uart_cpu_powerpc.c 308373 2016-11-06 15:12:05Z jhibbits $");
29
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
43bus_space_tag_t uart_bus_space_io = &bs_le_tag;
44bus_space_tag_t uart_bus_space_mem = &bs_le_tag;
45
46int
47uart_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
53static int
54ofw_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
77static int
78ofw_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
109int
110uart_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
204