2 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
3 * Marius Groeger <mgroeger@sysgo.de>
7 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
10 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
11 * Marius Groeger <mgroeger@sysgo.de>
14 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
15 * Alex Zuepke <azu@sysgo.de>
17 * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
19 * SPDX-License-Identifier: GPL-2.0+
23 #include <asm/hardware.h>
25 DECLARE_GLOBAL_DATA_PTR;
27 /* flush serial input queue. returns 0 on success or negative error
30 static int serial_flush_input(void)
34 /* keep on reading as long as the receiver is not empty */
35 while(UTRSTAT0&0x01) {
43 /* flush output queue. returns 0 on success or negative error number
46 static int serial_flush_output(void)
48 /* wait until the transmitter is no longer busy */
49 while(!(UTRSTAT0 & 0x02)) {
56 static void s3c44b0_serial_setbrg(void)
60 /* get correct divisor */
61 switch(gd->baudrate) {
64 #if CONFIG_S3C44B0_CLOCK_SPEED==66
66 #elif CONFIG_S3C44B0_CLOCK_SPEED==75
69 # error CONFIG_S3C44B0_CLOCK_SPEED undefined
74 #if CONFIG_S3C44B0_CLOCK_SPEED==66
76 #elif CONFIG_S3C44B0_CLOCK_SPEED==75
79 # error CONFIG_S3C44B0_CLOCK_SPEED undefined
84 #if CONFIG_S3C44B0_CLOCK_SPEED==66
86 #elif CONFIG_S3C44B0_CLOCK_SPEED==75
89 # error CONFIG_S3C44B0_CLOCK_SPEED undefined
94 #if CONFIG_S3C44B0_CLOCK_SPEED==66
96 #elif CONFIG_S3C44B0_CLOCK_SPEED==75
99 # error CONFIG_S3C44B0_CLOCK_SPEED undefined
103 #if CONFIG_S3C44B0_CLOCK_SPEED==66
105 #elif CONFIG_S3C44B0_CLOCK_SPEED==75
108 # error CONFIG_S3C44B0_CLOCK_SPEED undefined
112 #if CONFIG_S3C44B0_CLOCK_SPEED==66
114 #elif CONFIG_S3C44B0_CLOCK_SPEED==75
117 # error CONFIG_S3C44B0_CLOCK_SPEED undefined
121 serial_flush_output();
122 serial_flush_input();
133 for(divisor=0; divisor<100; divisor++) {
140 * Initialise the serial port with the given baudrate. The settings
141 * are always 8 data bits, no parity, 1 stop bit, no start bits.
144 static int s3c44b0_serial_init(void)
153 * Output a single byte to the serial port.
155 static void s3c44b0_serial_putc(const char c)
157 /* wait for room in the transmit FIFO */
158 while(!(UTRSTAT0 & 0x02));
160 UTXH0 = (unsigned char)c;
163 to be polite with serial console add a line feed
164 to the carriage return character
171 * Read a single byte from the serial port. Returns 1 on success, 0
172 * otherwise. When the function is succesfull, the character read is
173 * written into its argument c.
175 static int s3c44b0_serial_tstc(void)
177 return (UTRSTAT0 & 0x01);
181 * Read a single byte from the serial port. Returns 1 on success, 0
182 * otherwise. When the function is succesfull, the character read is
183 * written into its argument c.
185 static int s3c44b0_serial_getc(void)
190 rv = s3c44b0_serial_tstc();
197 static struct serial_device s3c44b0_serial_drv = {
198 .name = "s3c44b0_serial",
199 .start = s3c44b0_serial_init,
201 .setbrg = s3c44b0_serial_setbrg,
202 .putc = s3c44b0_serial_putc,
203 .puts = default_serial_puts,
204 .getc = s3c44b0_serial_getc,
205 .tstc = s3c44b0_serial_tstc,
208 void s3c44b0_serial_initialize(void)
210 serial_register(&s3c44b0_serial_drv);
213 __weak struct serial_device *default_serial_console(void)
215 return &s3c44b0_serial_drv;