pyright 2002 * Sysgo Real-Time Solutions, GmbH * Marius Groeger * * (C) Copyright 2002 * ght 2002-2004 * Wolfgang Denk, DENX Software Engineering, * * (C) Copyright 2002 * Sysgo Real-Time Solutions, GmbH * Marius Groeger * * (C) Copyright 2002 * Sysgo Real-Time Solutions, GmbH * Alex Zuepke * * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl) * * SPDX-License-Identifier: GPL-2.0+ */ #include #include DECLARE_GLOBAL_DATA_PTR; /* flush serial input queue. returns 0 on success or negative error * number otherwise */ static int serial_flush_input(void) { volatile u32 tmp; /* keep on reading as long as the receiver is not empty */ while(UTRSTAT0&0x01) { tmp = REGB(URXH0); } return 0; } /* flush output queue. returns 0 on success or negative error number * otherwise */ static int serial_flush_output(void) { /* wait until the transmitter is no longer busy */ while(!(UTRSTAT0 & 0x02)) { } return 0; } static void s3c44b0_serial_setbrg(void) { u32 divisor = 0; /* get correct divisor */ switch(gd->baudrate) { case 1200: #if CONFIG_S3C44B0_CLOCK_SPEED==66 divisor = 3124; #elif CONFIG_S3C44B0_CLOCK_SPEED==75 divisor = 3905; #else # error CONFIG_S3C44B0_CLOCK_SPEED undefined #endif break; case 9600: #if CONFIG_S3C44B0_CLOCK_SPEED==66 divisor = 390; #elif CONFIG_S3C44B0_CLOCK_SPEED==75 divisor = 487; #else # error CONFIG_S3C44B0_CLOCK_SPEED undefined #endif break; case 19200: #if CONFIG_S3C44B0_CLOCK_SPEED==66 divisor = 194; #elif CONFIG_S3C44B0_CLOCK_SPEED==75 divisor = 243; #else # error CONFIG_S3C44B0_CLOCK_SPEED undefined #endif break; case 38400: #if CONFIG_S3C44B0_CLOCK_SPEED==66 divisor = 97; #elif CONFIG_S3C44B0_CLOCK_SPEED==75 divisor = 121; #else # error CONFIG_S3C44B0_CLOCK_SPEED undefined #endif /* break; */ case 57600: #if CONFIG_S3C44B0_CLOCK_SPEED==66 divisor = 64; #elif CONFIG_S3C44B0_CLOCK_SPEED==75 divisor = 80; #else # error CONFIG_S3C44B0_CLOCK_SPEED undefined #endif /* break; */ case 115200: #if CONFIG_S3C44B0_CLOCK_SPEED==66 divisor = 32; #elif CONFIG_S3C44B0_CLOCK_SPEED==75 divisor = 40; #else # error CONFIG_S3C44B0_CLOCK_SPEED undefined #endif /* break; */ } serial_flush_output(); serial_flush_input(); UFCON0 = 0x0; ULCON0 = 0x03; UCON0 = 0x05; UBRDIV0 = divisor; UFCON1 = 0x0; ULCON1 = 0x03; UCON1 = 0x05; UBRDIV1 = divisor; for(divisor=0; divisor<100; divisor++) { /* NOP */ } } /* * Initialise the serial port with the given baudrate. The settings * are always 8 data bits, no parity, 1 stop bit, no start bits. * */ static int s3c44b0_serial_init(void) { serial_setbrg (); return (0); } /* * Output a single byte to the serial port. */ static void s3c44b0_serial_putc(const char c) { /* wait for room in the transmit FIFO */ while(!(UTRSTAT0 & 0x02)); UTXH0 = (unsigned char)c; /* to be polite with serial console add a line feed to the carriage return character */ if (c=='\n') serial_putc('\r'); } /* * Read a single byte from the serial port. Returns 1 on success, 0 * otherwise. When the function is succesfull, the character read is * written into its argument c. */ static int s3c44b0_serial_tstc(void) { return (UTRSTAT0 & 0x01); } /* * Read a single byte from the serial port. Returns 1 on success, 0 * otherwise. When the function is succesfull, the character read is * written into its argument c. */ static int s3c44b0_serial_getc(void) { int rv; for(;;) { rv = s3c44b0_serial_tstc(); if(rv > 0) return URXH0; } } static struct serial_device s3c44b0_serial_drv = { .name = "s3c44b0_serial", .start = s3c44b0_serial_init, .stop = NULL, .setbrg = s3c44b0_serial_setbrg, .putc = s3c44b0_serial_putc, .puts = default_serial_puts, .getc = s3c44b0_serial_getc, .tstc = s3c44b0_serial_tstc, }; void s3c44b0_serial_initialize(void) { serial_register(&s3c44b0_serial_drv); } __weak struct serial_device *default_serial_console(void) { return &s3c44b0_serial_drv; }