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142 lines
3.4 KiB
C
142 lines
3.4 KiB
C
/*
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* Jz47xx UART support
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*
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* Hardcoded to UART 0 for now
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* Options also hardcoded to 8N1
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*
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* Copyright (c) 2005
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* Ingenic Semiconductor, <jlwei@ingenic.cn>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (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,
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* MA 02111-1307 USA
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*/
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#include <config.h>
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#if defined(CONFIG_JZ4740)
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#include <common.h>
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#include <asm/jz4740.h>
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#undef UART_BASE
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#ifndef CONFIG_SYS_UART_BASE
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#define UART_BASE UART0_BASE
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#else
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#define UART_BASE CONFIG_SYS_UART_BASE
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#endif
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/******************************************************************************
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*
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* serial_init - initialize a channel
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*
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* This routine initializes the number of data bits, parity
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* and set the selected baud rate. Interrupts are disabled.
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* Set the modem control signals if the option is selected.
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*
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* RETURNS: N/A
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*/
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int serial_init (void)
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{
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#if !defined(CONFIG_NAND_U_BOOT) || defined(CONFIG_NAND_SPL)
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volatile u8 *uart_fcr = (volatile u8 *)(UART_BASE + OFF_FCR);
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volatile u8 *uart_lcr = (volatile u8 *)(UART_BASE + OFF_LCR);
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volatile u8 *uart_ier = (volatile u8 *)(UART_BASE + OFF_IER);
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volatile u8 *uart_sircr = (volatile u8 *)(UART_BASE + OFF_SIRCR);
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/* Disable port interrupts while changing hardware */
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*uart_ier = 0;
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/* Disable UART unit function */
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*uart_fcr = ~UART_FCR_UUE;
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/* Set both receiver and transmitter in UART mode (not SIR) */
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*uart_sircr = ~(SIRCR_RSIRE | SIRCR_TSIRE);
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/* Set databits, stopbits and parity. (8-bit data, 1 stopbit, no parity) */
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*uart_lcr = UART_LCR_WLEN_8 | UART_LCR_STOP_1;
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/* Set baud rate */
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serial_setbrg();
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/* Enable UART unit, enable and clear FIFO */
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*uart_fcr = UART_FCR_UUE | UART_FCR_FE | UART_FCR_TFLS | UART_FCR_RFLS;
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#endif
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return 0;
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}
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void serial_setbrg (void)
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{
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volatile u8 *uart_lcr = (volatile u8 *)(UART_BASE + OFF_LCR);
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volatile u8 *uart_dlhr = (volatile u8 *)(UART_BASE + OFF_DLHR);
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volatile u8 *uart_dllr = (volatile u8 *)(UART_BASE + OFF_DLLR);
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u32 baud_div, tmp;
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baud_div = CONFIG_SYS_EXTAL / 16 / CONFIG_BAUDRATE;
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tmp = *uart_lcr;
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tmp |= UART_LCR_DLAB;
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*uart_lcr = tmp;
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*uart_dlhr = (baud_div >> 8) & 0xff;
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*uart_dllr = baud_div & 0xff;
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tmp &= ~UART_LCR_DLAB;
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*uart_lcr = tmp;
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}
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void serial_putc (const char c)
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{
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volatile u8 *uart_lsr = (volatile u8 *)(UART_BASE + OFF_LSR);
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volatile u8 *uart_tdr = (volatile u8 *)(UART_BASE + OFF_TDR);
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if (c == '\n') serial_putc ('\r');
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/* Wait for fifo to shift out some bytes */
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while ( !((*uart_lsr & (UART_LSR_TDRQ | UART_LSR_TEMT)) == 0x60) );
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*uart_tdr = (u8)c;
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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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volatile u8 *uart_rdr = (volatile u8 *)(UART_BASE + OFF_RDR);
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while (!serial_tstc());
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return *uart_rdr;
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}
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int serial_tstc (void)
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{
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volatile u8 *uart_lsr = (volatile u8 *)(UART_BASE + OFF_LSR);
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if (*uart_lsr & UART_LSR_DR) {
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/* Data in rfifo */
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return (1);
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}
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return 0;
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}
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#endif
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