From 393541dce8995dbe0fc3d4691b382c06e5824b14 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Mon, 12 Apr 2010 18:17:26 +0000 Subject: Add uboot for xburst package SVN-Revision: 20832 --- package/uboot-xburst/files/cpu/mips/jz_serial.c | 141 ++++++++++++++++++++++++ 1 file changed, 141 insertions(+) create mode 100644 package/uboot-xburst/files/cpu/mips/jz_serial.c (limited to 'package/uboot-xburst/files/cpu/mips/jz_serial.c') diff --git a/package/uboot-xburst/files/cpu/mips/jz_serial.c b/package/uboot-xburst/files/cpu/mips/jz_serial.c new file mode 100644 index 0000000..e9a18a1 --- /dev/null +++ b/package/uboot-xburst/files/cpu/mips/jz_serial.c @@ -0,0 +1,141 @@ +/* + * Jz47xx UART support + * + * Hardcoded to UART 0 for now + * Options also hardcoded to 8N1 + * + * Copyright (c) 2005 + * Ingenic Semiconductor, + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include + +#if defined(CONFIG_JZ4740) + +#include + +#include + +#undef UART_BASE +#ifndef CONFIG_SYS_UART_BASE +#define UART_BASE UART0_BASE +#else +#define UART_BASE CONFIG_SYS_UART_BASE +#endif + +/****************************************************************************** +* +* serial_init - initialize a channel +* +* This routine initializes the number of data bits, parity +* and set the selected baud rate. Interrupts are disabled. +* Set the modem control signals if the option is selected. +* +* RETURNS: N/A +*/ + +int serial_init (void) +{ +#if !defined(CONFIG_NAND_U_BOOT) || defined(CONFIG_NAND_SPL) + volatile u8 *uart_fcr = (volatile u8 *)(UART_BASE + OFF_FCR); + volatile u8 *uart_lcr = (volatile u8 *)(UART_BASE + OFF_LCR); + volatile u8 *uart_ier = (volatile u8 *)(UART_BASE + OFF_IER); + volatile u8 *uart_sircr = (volatile u8 *)(UART_BASE + OFF_SIRCR); + + /* Disable port interrupts while changing hardware */ + *uart_ier = 0; + + /* Disable UART unit function */ + *uart_fcr = ~UART_FCR_UUE; + + /* Set both receiver and transmitter in UART mode (not SIR) */ + *uart_sircr = ~(SIRCR_RSIRE | SIRCR_TSIRE); + + /* Set databits, stopbits and parity. (8-bit data, 1 stopbit, no parity) */ + *uart_lcr = UART_LCR_WLEN_8 | UART_LCR_STOP_1; + + /* Set baud rate */ + serial_setbrg(); + + /* Enable UART unit, enable and clear FIFO */ + *uart_fcr = UART_FCR_UUE | UART_FCR_FE | UART_FCR_TFLS | UART_FCR_RFLS; +#endif + return 0; +} + +void serial_setbrg (void) +{ + volatile u8 *uart_lcr = (volatile u8 *)(UART_BASE + OFF_LCR); + volatile u8 *uart_dlhr = (volatile u8 *)(UART_BASE + OFF_DLHR); + volatile u8 *uart_dllr = (volatile u8 *)(UART_BASE + OFF_DLLR); + u32 baud_div, tmp; + + baud_div = CONFIG_SYS_EXTAL / 16 / CONFIG_BAUDRATE; + + tmp = *uart_lcr; + tmp |= UART_LCR_DLAB; + *uart_lcr = tmp; + + *uart_dlhr = (baud_div >> 8) & 0xff; + *uart_dllr = baud_div & 0xff; + + tmp &= ~UART_LCR_DLAB; + *uart_lcr = tmp; +} + +void serial_putc (const char c) +{ + volatile u8 *uart_lsr = (volatile u8 *)(UART_BASE + OFF_LSR); + volatile u8 *uart_tdr = (volatile u8 *)(UART_BASE + OFF_TDR); + + if (c == '\n') serial_putc ('\r'); + + /* Wait for fifo to shift out some bytes */ + while ( !((*uart_lsr & (UART_LSR_TDRQ | UART_LSR_TEMT)) == 0x60) ); + + *uart_tdr = (u8)c; +} + +void serial_puts (const char *s) +{ + while (*s) { + serial_putc (*s++); + } +} + +int serial_getc (void) +{ + volatile u8 *uart_rdr = (volatile u8 *)(UART_BASE + OFF_RDR); + + while (!serial_tstc()); + + return *uart_rdr; +} + +int serial_tstc (void) +{ + volatile u8 *uart_lsr = (volatile u8 *)(UART_BASE + OFF_LSR); + + if (*uart_lsr & UART_LSR_DR) { + /* Data in rfifo */ + return (1); + } + return 0; +} + +#endif -- cgit v1.1