1 // SPDX-License-Identifier: GPL-2.0 1
2 /*
3 * Generic serial console support
4 *
5 * Author: Mark A. Greer <mgreer@mvista.com>
6 *
7 * Code in serial_edit_cmdline() copied from <
8 * and was written by Matt Porter <mporter@ker
9 *
10 * 2001,2006 (c) MontaVista Software, Inc.
11 */
12 #include <stdarg.h>
13 #include <stddef.h>
14 #include "types.h"
15 #include "string.h"
16 #include "stdio.h"
17 #include "io.h"
18 #include "ops.h"
19
20 static int serial_open(void)
21 {
22 struct serial_console_data *scdp = con
23 return scdp->open();
24 }
25
26 static void serial_write(const char *buf, int
27 {
28 struct serial_console_data *scdp = con
29
30 while (*buf != '\0')
31 scdp->putc(*buf++);
32 }
33
34 static void serial_edit_cmdline(char *buf, int
35 {
36 int timer = 0, count;
37 char ch, *cp;
38 struct serial_console_data *scdp = con
39
40 cp = buf;
41 count = strlen(buf);
42 cp = &buf[count];
43 count++;
44
45 do {
46 if (scdp->tstc()) {
47 while (((ch = scdp->ge
48 /* Test for ba
49 if ((ch == '\b
50 if (cp
51
52
53
54 }
55 /* Test for ^x
56 } else if ((ch
57 while
58
59
60
61 }
62 } else if (cou
63
64
65
66 }
67 }
68 break; /* Exit 'timer
69 }
70 udelay(1000); /* 1 msec */
71 } while (timer++ < timeout);
72 *cp = 0;
73 }
74
75 static void serial_close(void)
76 {
77 struct serial_console_data *scdp = con
78
79 if (scdp->close)
80 scdp->close();
81 }
82
83 static void *serial_get_stdout_devp(void)
84 {
85 void *devp;
86 char devtype[MAX_PROP_LEN];
87 char path[MAX_PATH_LEN];
88
89 devp = finddevice("/chosen");
90 if (devp == NULL)
91 goto err_out;
92
93 if (getprop(devp, "linux,stdout-path",
94 getprop(devp, "stdout-path", p
95 devp = finddevice(path);
96 if (devp == NULL)
97 goto err_out;
98
99 if ((getprop(devp, "device_typ
100 && !strcmp(dev
101 return devp;
102 }
103 err_out:
104 return NULL;
105 }
106
107 static struct serial_console_data serial_cd;
108
109 /* Node's "compatible" property determines whi
110 int serial_console_init(void)
111 {
112 void *devp;
113 int rc = -1;
114
115 devp = serial_get_stdout_devp();
116 if (devp == NULL)
117 goto err_out;
118
119 if (dt_is_compatible(devp, "ns16550")
120 dt_is_compatible(devp, "pnpPNP,501
121 rc = ns16550_console_init(devp
122 #ifdef CONFIG_CPM
123 else if (dt_is_compatible(devp, "fsl,c
124 dt_is_compatible(devp, "fsl,c
125 dt_is_compatible(devp, "fsl,c
126 dt_is_compatible(devp, "fsl,c
127 rc = cpm_console_init(devp, &s
128 #endif
129 #ifdef CONFIG_PPC_MPC52xx
130 else if (dt_is_compatible(devp, "fsl,m
131 rc = mpc5200_psc_console_init(
132 #endif
133 #ifdef CONFIG_PPC_POWERNV
134 else if (dt_is_compatible(devp, "ibm,o
135 rc = opal_console_init(devp, &
136 #endif
137
138 /* Add other serial console driver cal
139
140 if (!rc) {
141 console_ops.open = serial_open
142 console_ops.write = serial_wri
143 console_ops.close = serial_clo
144 console_ops.data = &serial_cd;
145
146 if (serial_cd.getc)
147 console_ops.edit_cmdli
148
149 return 0;
150 }
151 err_out:
152 return -1;
153 }
154
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