1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2011 The Chromium OS Authors.
7 * This provide a test serial port. It provides an emulated serial port where
8 * a test program and read out the serial output and inject serial input for
20 #include <linux/compiler.h>
21 #include <asm/state.h>
23 DECLARE_GLOBAL_DATA_PTR;
25 #if CONFIG_IS_ENABLED(OF_CONTROL)
29 * serial_buf: A buffer that holds keyboard characters for the
33 * serial_buf_write == serial_buf_read -> empty buffer
34 * (serial_buf_write + 1) % 16 == serial_buf_read -> full buffer
36 static char serial_buf[16];
37 static unsigned int serial_buf_write;
38 static unsigned int serial_buf_read;
40 struct sandbox_serial_platdata {
41 int colour; /* Text colour to use for output, -1 for none */
44 struct sandbox_serial_priv {
49 * output_ansi_colour() - Output an ANSI colour code
51 * @colour: Colour to output (0-7)
53 static void output_ansi_colour(int colour)
55 char ansi_code[] = "\x1b[1;3Xm";
57 ansi_code[5] = '0' + colour;
58 os_write(1, ansi_code, sizeof(ansi_code) - 1);
61 static void output_ansi_reset(void)
63 os_write(1, "\x1b[0m", 4);
66 static int sandbox_serial_probe(struct udevice *dev)
68 struct sandbox_state *state = state_get_current();
69 struct sandbox_serial_priv *priv = dev_get_priv(dev);
71 if (state->term_raw != STATE_TERM_COOKED)
72 os_tty_raw(0, state->term_raw == STATE_TERM_RAW_WITH_SIGS);
73 priv->start_of_line = 0;
75 if (state->term_raw != STATE_TERM_RAW)
81 static int sandbox_serial_remove(struct udevice *dev)
83 struct sandbox_serial_platdata *plat = dev->platdata;
85 if (plat->colour != -1)
91 static int sandbox_serial_putc(struct udevice *dev, const char ch)
93 struct sandbox_serial_priv *priv = dev_get_priv(dev);
94 struct sandbox_serial_platdata *plat = dev->platdata;
96 if (priv->start_of_line && plat->colour != -1) {
97 priv->start_of_line = false;
98 output_ansi_colour(plat->colour);
103 priv->start_of_line = true;
108 static unsigned int increment_buffer_index(unsigned int index)
110 return (index + 1) % ARRAY_SIZE(serial_buf);
113 static int sandbox_serial_pending(struct udevice *dev, bool input)
115 const unsigned int next_index =
116 increment_buffer_index(serial_buf_write);
123 #ifndef CONFIG_SPL_BUILD
126 if (next_index == serial_buf_read)
127 return 1; /* buffer full */
129 count = os_read(0, &serial_buf[serial_buf_write], 1);
131 serial_buf_write = next_index;
133 return serial_buf_write != serial_buf_read;
136 static int sandbox_serial_getc(struct udevice *dev)
140 if (!sandbox_serial_pending(dev, true))
141 return -EAGAIN; /* buffer empty */
143 result = serial_buf[serial_buf_read];
144 serial_buf_read = increment_buffer_index(serial_buf_read);
147 #endif /* CONFIG_IS_ENABLED(OF_CONTROL) */
149 #ifdef CONFIG_DEBUG_UART_SANDBOX
151 #include <debug_uart.h>
153 static inline void _debug_uart_init(void)
157 static inline void _debug_uart_putc(int ch)
164 #endif /* CONFIG_DEBUG_UART_SANDBOX */
166 static int sandbox_serial_setconfig(struct udevice *dev, uint serial_config)
168 u8 parity = SERIAL_GET_PARITY(serial_config);
169 u8 bits = SERIAL_GET_BITS(serial_config);
170 u8 stop = SERIAL_GET_STOP(serial_config);
172 if (bits != SERIAL_8_BITS || stop != SERIAL_ONE_STOP ||
173 parity != SERIAL_PAR_NONE)
174 return -ENOTSUPP; /* not supported in driver*/
179 #if CONFIG_IS_ENABLED(OF_CONTROL)
180 static const char * const ansi_colour[] = {
181 "black", "red", "green", "yellow", "blue", "megenta", "cyan",
185 static int sandbox_serial_ofdata_to_platdata(struct udevice *dev)
187 struct sandbox_serial_platdata *plat = dev->platdata;
192 colour = fdt_getprop(gd->fdt_blob, dev_of_offset(dev),
193 "sandbox,text-colour", NULL);
195 for (i = 0; i < ARRAY_SIZE(ansi_colour); i++) {
196 if (!strcmp(colour, ansi_colour[i])) {
206 static const struct dm_serial_ops sandbox_serial_ops = {
207 .putc = sandbox_serial_putc,
208 .pending = sandbox_serial_pending,
209 .getc = sandbox_serial_getc,
210 .setconfig = sandbox_serial_setconfig,
213 static const struct udevice_id sandbox_serial_ids[] = {
214 { .compatible = "sandbox,serial" },
218 U_BOOT_DRIVER(serial_sandbox) = {
219 .name = "serial_sandbox",
221 .of_match = sandbox_serial_ids,
222 .ofdata_to_platdata = sandbox_serial_ofdata_to_platdata,
223 .platdata_auto_alloc_size = sizeof(struct sandbox_serial_platdata),
224 .priv_auto_alloc_size = sizeof(struct sandbox_serial_priv),
225 .probe = sandbox_serial_probe,
226 .remove = sandbox_serial_remove,
227 .ops = &sandbox_serial_ops,
228 .flags = DM_FLAG_PRE_RELOC,
231 static const struct sandbox_serial_platdata platdata_non_fdt = {
235 U_BOOT_DEVICE(serial_sandbox_non_fdt) = {
236 .name = "serial_sandbox",
237 .platdata = &platdata_non_fdt,
239 #endif /* CONFIG_IS_ENABLED(OF_CONTROL) */