180 lines
4.8 KiB
C
180 lines
4.8 KiB
C
/*
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<:copyright-gpl
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Copyright 2004 Broadcom Corp. All Rights Reserved.
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This program is free software; you can distribute it and/or modify it
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under the terms of the GNU General Public License (Version 2) as
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published by the Free Software Foundation.
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This program is distributed in the hope it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
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:>
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*/
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/*
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* Broadcom bcm63xx serial port initialization, also prepare for printk
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* by registering with console_init
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*
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*/
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#include <linux/autoconf.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/console.h>
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#include <linux/sched.h>
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#include <asm/addrspace.h>
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#include <asm/irq.h>
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#include <asm/reboot.h>
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#include <asm/gdb-stub.h>
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#include <asm/mc146818rtc.h>
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#include <bcm_map_part.h>
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#include <board.h>
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#define SER63XX_DEFAULT_BAUD 115200
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#define BD_BCM63XX_TIMER_CLOCK_INPUT (FPERIPH)
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#define stUart ((volatile Uart * const) UART_BASE)
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// Transmit interrupts
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#define TXINT (TXFIFOEMT | TXUNDERR | TXOVFERR)
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// Receive interrupts
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#define RXINT (RXFIFONE | RXOVFERR)
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/* --------------------------------------------------------------------------
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Name: serial_init
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Purpose: Initalize the UART
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-------------------------------------------------------------------------- */
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void __init serial_init(void)
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{
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UINT32 tmpVal = SER63XX_DEFAULT_BAUD;
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ULONG clockFreqHz;
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#if defined(CONFIG_BCM96345)
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// Make sure clock is ticking
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PERF->blkEnables |= UART_CLK_EN;
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#endif
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/* Dissable channel's receiver and transmitter. */
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stUart->control &= ~(BRGEN|TXEN|RXEN);
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/*--------------------------------------------------------------------*/
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/* Write the table value to the clock select register. */
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/* DPullen - this is the equation to use: */
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/* value = clockFreqHz / baud / 32-1; */
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/* (snmod) Actually you should also take into account any necessary */
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/* rounding. Divide by 16, look at lsb, if 0, divide by 2 */
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/* and subtract 1. If 1, just divide by 2 */
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/*--------------------------------------------------------------------*/
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clockFreqHz = BD_BCM63XX_TIMER_CLOCK_INPUT;
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tmpVal = (clockFreqHz / tmpVal) / 16;
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if( tmpVal & 0x01 )
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tmpVal /= 2; //Rounding up, so sub is already accounted for
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else
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tmpVal = (tmpVal / 2) - 1; // Rounding down so we must sub 1
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stUart->baudword = tmpVal;
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/* Finally, re-enable the transmitter and receiver. */
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stUart->control |= (BRGEN|TXEN|RXEN);
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stUart->config = (BITS8SYM | ONESTOP);
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// Set the FIFO interrupt depth ... stUart->fifocfg = 0xAA;
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stUart->fifoctl = RSTTXFIFOS | RSTRXFIFOS;
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stUart->intMask = 0;
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stUart->intMask = RXINT | TXINT;
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}
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/* prom_putc()
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* Output a character to the UART
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*/
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void prom_putc(char c)
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{
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/* Wait for Tx uffer to empty */
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while (! (READ16(stUart->intStatus) & TXFIFOEMT));
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/* Send character */
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stUart->Data = c;
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}
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/* prom_puts()
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* Write a string to the UART
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*/
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void prom_puts(const char *s)
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{
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while (*s) {
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if (*s == '\n') {
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prom_putc('\r');
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}
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prom_putc(*s++);
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}
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}
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/* prom_getc_nowait()
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* Returns a character from the UART
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* Returns -1 if no characters available or corrupted
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*/
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int prom_getc_nowait(void)
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{
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uint16 uStatus;
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int cData = -1;
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uStatus = READ16(stUart->intStatus);
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if (uStatus & RXFIFONE) { /* Do we have a character? */
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cData = READ16(stUart->Data) & 0xff; /* Read character */
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if (uStatus & (RXFRAMERR | RXPARERR)) { /* If we got an error, throw it away */
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cData = -1;
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}
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}
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return cData;
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}
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/* prom_getc()
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* Returns a charcter from the serial port
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* Will block until it receives a valid character
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*/
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char prom_getc(void)
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{
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int cData = -1;
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/* Loop until we get a valid character */
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while(cData == -1) {
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cData = prom_getc_nowait();
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}
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return (char) cData;
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}
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/* prom_testc()
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* Returns 0 if no characters available
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*/
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int prom_testc(void)
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{
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uint16 uStatus;
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uStatus = READ16(stUart->intStatus);
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return (uStatus & RXFIFONE);
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}
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#if defined (CONFIG_REMOTE_DEBUG)
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/* Prevent other code from writing to the serial port */
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void _putc(char c) { }
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void _puts(const char *ptr) { }
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#else
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/* Low level outputs call prom routines */
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void _putc(char c) {
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prom_putc(c);
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}
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void _puts(const char *ptr) {
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prom_puts(ptr);
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}
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#endif
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