mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-14 23:33:00 +00:00
139 lines
3.3 KiB
C
139 lines
3.3 KiB
C
/* GRLIB APBUART Serial controller driver
|
|
*
|
|
* (C) Copyright 2007
|
|
* Daniel Hellstrom, Gaisler Research, daniel@gaisler.com.
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* 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 <common.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/leon.h>
|
|
#include <ambapp.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
/* Force cache miss each time a serial controller reg is read */
|
|
#define CACHE_BYPASS 1
|
|
|
|
#ifdef CACHE_BYPASS
|
|
#define READ_BYTE(var) SPARC_NOCACHE_READ_BYTE((unsigned int)&(var))
|
|
#define READ_HWORD(var) SPARC_NOCACHE_READ_HWORD((unsigned int)&(var))
|
|
#define READ_WORD(var) SPARC_NOCACHE_READ((unsigned int)&(var))
|
|
#define READ_DWORD(var) SPARC_NOCACHE_READ_DWORD((unsigned int)&(var))
|
|
#endif
|
|
|
|
ambapp_dev_apbuart *leon3_apbuart = NULL;
|
|
|
|
int serial_init(void)
|
|
{
|
|
ambapp_apbdev apbdev;
|
|
unsigned int tmp;
|
|
|
|
/* find UART */
|
|
if (ambapp_apb_first(VENDOR_GAISLER, GAISLER_APBUART, &apbdev) == 1) {
|
|
|
|
leon3_apbuart = (ambapp_dev_apbuart *) apbdev.address;
|
|
|
|
/* found apbuart, let's init...
|
|
*
|
|
* Set scaler / baud rate
|
|
*
|
|
* Receiver & transmitter enable
|
|
*/
|
|
leon3_apbuart->scaler = CONFIG_SYS_GRLIB_APBUART_SCALER;
|
|
|
|
/* Let bit 11 be unchanged (debug bit for GRMON) */
|
|
tmp = READ_WORD(leon3_apbuart->ctrl);
|
|
|
|
leon3_apbuart->ctrl = ((tmp & LEON_REG_UART_CTRL_DBG) |
|
|
LEON_REG_UART_CTRL_RE |
|
|
LEON_REG_UART_CTRL_TE);
|
|
|
|
return 0;
|
|
}
|
|
return -1; /* didn't find hardware */
|
|
}
|
|
|
|
void serial_putc(const char c)
|
|
{
|
|
if (c == '\n')
|
|
serial_putc_raw('\r');
|
|
|
|
serial_putc_raw(c);
|
|
}
|
|
|
|
void serial_putc_raw(const char c)
|
|
{
|
|
if (!leon3_apbuart)
|
|
return;
|
|
|
|
/* Wait for last character to go. */
|
|
while (!(READ_WORD(leon3_apbuart->status) & LEON_REG_UART_STATUS_THE)) ;
|
|
|
|
/* Send data */
|
|
leon3_apbuart->data = c;
|
|
|
|
#ifdef LEON_DEBUG
|
|
/* Wait for data to be sent */
|
|
while (!(READ_WORD(leon3_apbuart->status) & LEON_REG_UART_STATUS_TSE)) ;
|
|
#endif
|
|
}
|
|
|
|
void serial_puts(const char *s)
|
|
{
|
|
while (*s) {
|
|
serial_putc(*s++);
|
|
}
|
|
}
|
|
|
|
int serial_getc(void)
|
|
{
|
|
if (!leon3_apbuart)
|
|
return 0;
|
|
|
|
/* Wait for a character to arrive. */
|
|
while (!(READ_WORD(leon3_apbuart->status) & LEON_REG_UART_STATUS_DR)) ;
|
|
|
|
/* read data */
|
|
return READ_WORD(leon3_apbuart->data);
|
|
}
|
|
|
|
int serial_tstc(void)
|
|
{
|
|
if (leon3_apbuart)
|
|
return (READ_WORD(leon3_apbuart->status) &
|
|
LEON_REG_UART_STATUS_DR);
|
|
return 0;
|
|
}
|
|
|
|
/* set baud rate for uart */
|
|
void serial_setbrg(void)
|
|
{
|
|
/* update baud rate settings, read it from gd->baudrate */
|
|
unsigned int scaler;
|
|
if (leon3_apbuart && (gd->baudrate > 0)) {
|
|
scaler =
|
|
(((CONFIG_SYS_CLK_FREQ * 10) / (gd->baudrate * 8)) -
|
|
5) / 10;
|
|
leon3_apbuart->scaler = scaler;
|
|
}
|
|
return;
|
|
}
|