1/*
2 * Generic serial console support
3 *
4 * Author: Mark A. Greer <mgreer@mvista.com>
5 *
6 * Code in serial_edit_cmdline() copied from <file:arch/ppc/boot/simple/misc.c>
7 * and was written by Matt Porter <mporter@kernel.crashing.org>.
8 *
9 * 2001,2006 (c) MontaVista Software, Inc.  This file is licensed under
10 * the terms of the GNU General Public License version 2.  This program
11 * is licensed "as is" without any warranty of any kind, whether express
12 * or implied.
13 */
14#include <stdarg.h>
15#include <stddef.h>
16#include "types.h"
17#include "string.h"
18#include "stdio.h"
19#include "io.h"
20#include "ops.h"
21
22static int serial_open(void)
23{
24	struct serial_console_data *scdp = console_ops.data;
25	return scdp->open();
26}
27
28static void serial_write(const char *buf, int len)
29{
30	struct serial_console_data *scdp = console_ops.data;
31
32	while (*buf != '\0')
33		scdp->putc(*buf++);
34}
35
36static void serial_edit_cmdline(char *buf, int len)
37{
38	int timer = 0, count;
39	char ch, *cp;
40	struct serial_console_data *scdp = console_ops.data;
41
42	cp = buf;
43	count = strlen(buf);
44	cp = &buf[count];
45	count++;
46
47	while (timer++ < 5*1000) {
48		if (scdp->tstc()) {
49			while (((ch = scdp->getc()) != '\n') && (ch != '\r')) {
50				/* Test for backspace/delete */
51				if ((ch == '\b') || (ch == '\177')) {
52					if (cp != buf) {
53						cp--;
54						count--;
55						printf("\b \b");
56					}
57				/* Test for ^x/^u (and wipe the line) */
58				} else if ((ch == '\030') || (ch == '\025')) {
59					while (cp != buf) {
60						cp--;
61						count--;
62						printf("\b \b");
63					}
64				} else if (count < len) {
65						*cp++ = ch;
66						count++;
67						scdp->putc(ch);
68				}
69			}
70			break;  /* Exit 'timer' loop */
71		}
72		udelay(1000);  /* 1 msec */
73	}
74	*cp = 0;
75}
76
77static void serial_close(void)
78{
79	struct serial_console_data *scdp = console_ops.data;
80
81	if (scdp->close)
82		scdp->close();
83}
84
85static void *serial_get_stdout_devp(void)
86{
87	void *devp;
88	char devtype[MAX_PROP_LEN];
89	char path[MAX_PATH_LEN];
90
91	devp = finddevice("/chosen");
92	if (devp == NULL)
93		goto err_out;
94
95	if (getprop(devp, "linux,stdout-path", path, MAX_PATH_LEN) > 0) {
96		devp = finddevice(path);
97		if (devp == NULL)
98			goto err_out;
99
100		if ((getprop(devp, "device_type", devtype, sizeof(devtype)) > 0)
101				&& !strcmp(devtype, "serial"))
102			return devp;
103	}
104err_out:
105	return NULL;
106}
107
108static struct serial_console_data serial_cd;
109
110/* Node's "compatible" property determines which serial driver to use */
111int serial_console_init(void)
112{
113	void *devp;
114	int rc = -1;
115
116	devp = serial_get_stdout_devp();
117	if (devp == NULL)
118		goto err_out;
119
120	if (dt_is_compatible(devp, "ns16550") ||
121	    dt_is_compatible(devp, "pnpPNP,501"))
122		rc = ns16550_console_init(devp, &serial_cd);
123	else if (dt_is_compatible(devp, "marvell,mv64360-mpsc"))
124		rc = mpsc_console_init(devp, &serial_cd);
125	else if (dt_is_compatible(devp, "fsl,cpm1-scc-uart") ||
126	         dt_is_compatible(devp, "fsl,cpm1-smc-uart") ||
127	         dt_is_compatible(devp, "fsl,cpm2-scc-uart") ||
128	         dt_is_compatible(devp, "fsl,cpm2-smc-uart"))
129		rc = cpm_console_init(devp, &serial_cd);
130	else if (dt_is_compatible(devp, "fsl,mpc5200-psc-uart"))
131		rc = mpc5200_psc_console_init(devp, &serial_cd);
132	else if (dt_is_compatible(devp, "xlnx,opb-uartlite-1.00.b") ||
133		 dt_is_compatible(devp, "xlnx,xps-uartlite-1.00.a"))
134		rc = uartlite_console_init(devp, &serial_cd);
135
136	/* Add other serial console driver calls here */
137
138	if (!rc) {
139		console_ops.open = serial_open;
140		console_ops.write = serial_write;
141		console_ops.close = serial_close;
142		console_ops.data = &serial_cd;
143
144		if (serial_cd.getc)
145			console_ops.edit_cmdline = serial_edit_cmdline;
146
147		return 0;
148	}
149err_out:
150	return -1;
151}
152