aboutsummaryrefslogtreecommitdiff
path: root/drivers/serial/sandbox.c
blob: 4a05ea44ce99fed335c722fb5791f5c27b5bbb8e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2011 The Chromium OS Authors.
 */

/*
 * This provide a test serial port. It provides an emulated serial port where
 * a test program and read out the serial output and inject serial input for
 * U-Boot.
 */

#include <common.h>
#include <console.h>
#include <dm.h>
#include <fdtdec.h>
#include <lcd.h>
#include <os.h>
#include <serial.h>
#include <video.h>
#include <linux/compiler.h>
#include <asm/state.h>

DECLARE_GLOBAL_DATA_PTR;

#if CONFIG_IS_ENABLED(OF_CONTROL)

/*
 *
 *   serial_buf: A buffer that holds keyboard characters for the
 *		 Sandbox U-Boot.
 *
 * invariants:
 *   serial_buf_write		 == serial_buf_read -> empty buffer
 *   (serial_buf_write + 1) % 16 == serial_buf_read -> full buffer
 */
static char serial_buf[16];
static unsigned int serial_buf_write;
static unsigned int serial_buf_read;

struct sandbox_serial_platdata {
	int colour;	/* Text colour to use for output, -1 for none */
};

struct sandbox_serial_priv {
	bool start_of_line;
};

/**
 * output_ansi_colour() - Output an ANSI colour code
 *
 * @colour: Colour to output (0-7)
 */
static void output_ansi_colour(int colour)
{
	char ansi_code[] = "\x1b[1;3Xm";

	ansi_code[5] = '0' + colour;
	os_write(1, ansi_code, sizeof(ansi_code) - 1);
}

static void output_ansi_reset(void)
{
	os_write(1, "\x1b[0m", 4);
}

static int sandbox_serial_probe(struct udevice *dev)
{
	struct sandbox_state *state = state_get_current();
	struct sandbox_serial_priv *priv = dev_get_priv(dev);

	if (state->term_raw != STATE_TERM_COOKED)
		os_tty_raw(0, state->term_raw == STATE_TERM_RAW_WITH_SIGS);
	priv->start_of_line = 0;

	if (state->term_raw != STATE_TERM_RAW)
		disable_ctrlc(1);

	return 0;
}

static int sandbox_serial_remove(struct udevice *dev)
{
	struct sandbox_serial_platdata *plat = dev->platdata;

	if (plat->colour != -1)
		output_ansi_reset();

	return 0;
}

static int sandbox_serial_putc(struct udevice *dev, const char ch)
{
	struct sandbox_serial_priv *priv = dev_get_priv(dev);
	struct sandbox_serial_platdata *plat = dev->platdata;

	if (priv->start_of_line && plat->colour != -1) {
		priv->start_of_line = false;
		output_ansi_colour(plat->colour);
	}

	os_write(1, &ch, 1);
	if (ch == '\n')
		priv->start_of_line = true;

	return 0;
}

static unsigned int increment_buffer_index(unsigned int index)
{
	return (index + 1) % ARRAY_SIZE(serial_buf);
}

static int sandbox_serial_pending(struct udevice *dev, bool input)
{
	const unsigned int next_index =
		increment_buffer_index(serial_buf_write);
	ssize_t count;

	if (!input)
		return 0;

	os_usleep(100);
#ifndef CONFIG_SPL_BUILD
	video_sync_all();
#endif
	if (next_index == serial_buf_read)
		return 1;	/* buffer full */

	count = os_read(0, &serial_buf[serial_buf_write], 1);
	if (count == 1)
		serial_buf_write = next_index;

	return serial_buf_write != serial_buf_read;
}

static int sandbox_serial_getc(struct udevice *dev)
{
	int result;

	if (!sandbox_serial_pending(dev, true))
		return -EAGAIN;	/* buffer empty */

	result = serial_buf[serial_buf_read];
	serial_buf_read = increment_buffer_index(serial_buf_read);
	return result;
}
#endif /* CONFIG_IS_ENABLED(OF_CONTROL) */

#ifdef CONFIG_DEBUG_UART_SANDBOX

#include <debug_uart.h>

static inline void _debug_uart_init(void)
{
}

static inline void _debug_uart_putc(int ch)
{
	os_putc(ch);
}

DEBUG_UART_FUNCS

#endif /* CONFIG_DEBUG_UART_SANDBOX */

static int sandbox_serial_setconfig(struct udevice *dev, uint serial_config)
{
	u8 parity = SERIAL_GET_PARITY(serial_config);
	u8 bits = SERIAL_GET_BITS(serial_config);
	u8 stop = SERIAL_GET_STOP(serial_config);

	if (bits != SERIAL_8_BITS || stop != SERIAL_ONE_STOP ||
	    parity != SERIAL_PAR_NONE)
		return -ENOTSUPP; /* not supported in driver*/

	return 0;
}

#if CONFIG_IS_ENABLED(OF_CONTROL)
static const char * const ansi_colour[] = {
	"black", "red", "green", "yellow", "blue", "megenta", "cyan",
	"white",
};

static int sandbox_serial_ofdata_to_platdata(struct udevice *dev)
{
	struct sandbox_serial_platdata *plat = dev->platdata;
	const char *colour;
	int i;

	plat->colour = -1;
	colour = fdt_getprop(gd->fdt_blob, dev_of_offset(dev),
			     "sandbox,text-colour", NULL);
	if (colour) {
		for (i = 0; i < ARRAY_SIZE(ansi_colour); i++) {
			if (!strcmp(colour, ansi_colour[i])) {
				plat->colour = i;
				break;
			}
		}
	}

	return 0;
}

static const struct dm_serial_ops sandbox_serial_ops = {
	.putc = sandbox_serial_putc,
	.pending = sandbox_serial_pending,
	.getc = sandbox_serial_getc,
	.setconfig = sandbox_serial_setconfig,
};

static const struct udevice_id sandbox_serial_ids[] = {
	{ .compatible = "sandbox,serial" },
	{ }
};

U_BOOT_DRIVER(serial_sandbox) = {
	.name	= "serial_sandbox",
	.id	= UCLASS_SERIAL,
	.of_match = sandbox_serial_ids,
	.ofdata_to_platdata = sandbox_serial_ofdata_to_platdata,
	.platdata_auto_alloc_size = sizeof(struct sandbox_serial_platdata),
	.priv_auto_alloc_size = sizeof(struct sandbox_serial_priv),
	.probe = sandbox_serial_probe,
	.remove = sandbox_serial_remove,
	.ops	= &sandbox_serial_ops,
	.flags = DM_FLAG_PRE_RELOC,
};

static const struct sandbox_serial_platdata platdata_non_fdt = {
	.colour = -1,
};

U_BOOT_DEVICE(serial_sandbox_non_fdt) = {
	.name = "serial_sandbox",
	.platdata = &platdata_non_fdt,
};
#endif /* CONFIG_IS_ENABLED(OF_CONTROL) */