100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
/*
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* (C) Copyright 2006
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* Mindspeed Technologies, Inc. <www.mindspeed.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <common.h>
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#include <asm/arch/bsp.h>
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#include <asm/hardware.h>
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#if defined(CONFIG_UART0)
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DECLARE_GLOBAL_DATA_PTR;
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#define MCR_RXD_ENABLE 0x80
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#define MCR_TXD_ENABLE 0x40
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#define MCR_TIMER_SOURCE 0x20
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#define LCR_WLEN8 0x03 /* Wordlength: 8 bits */
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#define SSR_DR 0x01 /* Receiver data ready */
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#define SSR_THRE 0x20 /* Transmit-hold-register empty */
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#define FCR_TIMER_DIV_BYPASS 0x04
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void serial_setbrg (void)
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{
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int baudrate;
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unsigned int reg;
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unsigned int clk = SoC_clk_amba_get();
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if ((baudrate = gd->baudrate) <= 0)
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baudrate = CONFIG_BAUDRATE;
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reg = clk / (baudrate * 16);
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(*(volatile u8 *)UART_RXD) = 0x0F;
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(*(volatile u8 *)UART_TXD) = 0x0F;
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SoC_timer1_set(reg);
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}
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int serial_init (void)
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{
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serial_setbrg ();
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(*(volatile u8 *)UART_FCR) = FCR_TIMER_DIV_BYPASS;
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(*(volatile u8 *)UART_MCR) = MCR_RXD_ENABLE | MCR_TXD_ENABLE | MCR_TIMER_SOURCE;
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(*(volatile u8 *)UART_LCR) = LCR_WLEN8;
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(*(volatile u8 *)UART_IER) = 0x00;
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return (0);
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}
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void serial_putc (const char c)
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{
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/* wait for transmitter to empty */
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while (!((*(volatile u8 *)UART_SSR) & SSR_THRE)) ;
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(*(volatile u8 *)UART_THR) = c;
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if (c == '\n')
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serial_putc ('\r');
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}
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void serial_puts (const char *s)
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{
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while (*s) {
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serial_putc (*s++);
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}
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}
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int serial_getc (void)
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{
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while (!((*(volatile u8 *)UART_SSR) & SSR_DR)) ;
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return ((*(volatile u8 *)UART_RBR) & 0xff);
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}
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int serial_tstc (void)
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{
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return ((*(volatile u8 *)UART_SSR) & SSR_DR);
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}
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#endif
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