diff options
Diffstat (limited to 'target/linux/brcm63xx/files/arch/mips/bcm963xx/ser_init.c')
| -rw-r--r-- | target/linux/brcm63xx/files/arch/mips/bcm963xx/ser_init.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/target/linux/brcm63xx/files/arch/mips/bcm963xx/ser_init.c b/target/linux/brcm63xx/files/arch/mips/bcm963xx/ser_init.c new file mode 100644 index 000000000..bb745aec6 --- /dev/null +++ b/target/linux/brcm63xx/files/arch/mips/bcm963xx/ser_init.c @@ -0,0 +1,181 @@ +/* +<:copyright-gpl + Copyright 2004 Broadcom Corp. All Rights Reserved. + + This program is free software; you can distribute it and/or modify it + under the terms of the GNU General Public License (Version 2) as + published by the Free Software Foundation. + + This program is distributed in the hope 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. +:> +*/ +/* + * Broadcom bcm63xx serial port initialization, also prepare for printk + * by registering with console_init + * + */ + +#include <linux/autoconf.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/console.h> +#include <linux/sched.h> + +#include <asm/addrspace.h> +#include <asm/irq.h> +#include <asm/reboot.h> +#include <asm/gdb-stub.h> +#include <asm/mc146818rtc.h> + +#include <bcm_map_part.h> +#include <6348_map_part.h> +#include <board.h> + +#define SER63XX_DEFAULT_BAUD 115200 +#define BD_BCM63XX_TIMER_CLOCK_INPUT (FPERIPH) +#define stUart ((volatile Uart * const) UART_BASE) + +// Transmit interrupts +#define TXINT (TXFIFOEMT | TXUNDERR | TXOVFERR) +// Receive interrupts +#define RXINT (RXFIFONE | RXOVFERR) + +/* -------------------------------------------------------------------------- + Name: serial_init + Purpose: Initalize the UART +-------------------------------------------------------------------------- */ +void __init serial_init(void) +{ + u32 tmpVal = SER63XX_DEFAULT_BAUD; + ULONG clockFreqHz; + +#if defined(CONFIG_BCM96345) + // Make sure clock is ticking + PERF->blkEnables |= UART_CLK_EN; +#endif + + /* Dissable channel's receiver and transmitter. */ + stUart->control &= ~(BRGEN|TXEN|RXEN); + + /*--------------------------------------------------------------------*/ + /* Write the table value to the clock select register. */ + /* DPullen - this is the equation to use: */ + /* value = clockFreqHz / baud / 32-1; */ + /* (snmod) Actually you should also take into account any necessary */ + /* rounding. Divide by 16, look at lsb, if 0, divide by 2 */ + /* and subtract 1. If 1, just divide by 2 */ + /*--------------------------------------------------------------------*/ + clockFreqHz = BD_BCM63XX_TIMER_CLOCK_INPUT; + tmpVal = (clockFreqHz / tmpVal) / 16; + if( tmpVal & 0x01 ) + tmpVal /= 2; //Rounding up, so sub is already accounted for + else + tmpVal = (tmpVal / 2) - 1; // Rounding down so we must sub 1 + stUart->baudword = tmpVal; + + /* Finally, re-enable the transmitter and receiver. */ + stUart->control |= (BRGEN|TXEN|RXEN); + + stUart->config = (BITS8SYM | ONESTOP); + // Set the FIFO interrupt depth ... stUart->fifocfg = 0xAA; + stUart->fifoctl = RSTTXFIFOS | RSTRXFIFOS; + stUart->intMask = 0; + stUart->intMask = RXINT | TXINT; +} + + +/* prom_putc() + * Output a character to the UART + */ +void prom_putc(char c) +{ + /* Wait for Tx uffer to empty */ + while (! (READ16(stUart->intStatus) & TXFIFOEMT)); + /* Send character */ + stUart->Data = c; +} + +/* prom_puts() + * Write a string to the UART + */ +void prom_puts(const char *s) +{ + while (*s) { + if (*s == '\n') { + prom_putc('\r'); + } + prom_putc(*s++); + } +} + + +/* prom_getc_nowait() + * Returns a character from the UART + * Returns -1 if no characters available or corrupted + */ +int prom_getc_nowait(void) +{ + uint16 uStatus; + int cData = -1; + + uStatus = READ16(stUart->intStatus); + + if (uStatus & RXFIFONE) { /* Do we have a character? */ + cData = READ16(stUart->Data) & 0xff; /* Read character */ + if (uStatus & (RXFRAMERR | RXPARERR)) { /* If we got an error, throw it away */ + cData = -1; + } + } + + return cData; +} + +/* prom_getc() + * Returns a charcter from the serial port + * Will block until it receives a valid character +*/ +char prom_getc(void) +{ + int cData = -1; + + /* Loop until we get a valid character */ + while(cData == -1) { + cData = prom_getc_nowait(); + } + return (char) cData; +} + +/* prom_testc() + * Returns 0 if no characters available + */ +int prom_testc(void) +{ + uint16 uStatus; + + uStatus = READ16(stUart->intStatus); + + return (uStatus & RXFIFONE); +} + +#if defined (CONFIG_REMOTE_DEBUG) +/* Prevent other code from writing to the serial port */ +void _putc(char c) { } +void _puts(const char *ptr) { } +#else +/* Low level outputs call prom routines */ +void _putc(char c) { + prom_putc(c); +} +void _puts(const char *ptr) { + prom_puts(ptr); +} +#endif |