mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-26 04:53:42 +00:00
1a4596601f
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
128 lines
2.6 KiB
C
128 lines
2.6 KiB
C
/* GRLIB APBUART Serial controller driver
|
|
*
|
|
* (C) Copyright 2007
|
|
* Daniel Hellstrom, Gaisler Research, daniel@gaisler.com.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/leon.h>
|
|
#include <ambapp.h>
|
|
#include <serial.h>
|
|
#include <linux/compiler.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
ambapp_dev_apbuart *leon3_apbuart = NULL;
|
|
|
|
static int leon3_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 */
|
|
}
|
|
|
|
static void leon3_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
|
|
}
|
|
|
|
static void leon3_serial_putc(const char c)
|
|
{
|
|
if (c == '\n')
|
|
leon3_serial_putc_raw('\r');
|
|
|
|
leon3_serial_putc_raw(c);
|
|
}
|
|
|
|
static int leon3_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);
|
|
}
|
|
|
|
static int leon3_serial_tstc(void)
|
|
{
|
|
if (leon3_apbuart)
|
|
return (READ_WORD(leon3_apbuart->status) &
|
|
LEON_REG_UART_STATUS_DR);
|
|
return 0;
|
|
}
|
|
|
|
/* set baud rate for uart */
|
|
static void leon3_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;
|
|
}
|
|
|
|
static struct serial_device leon3_serial_drv = {
|
|
.name = "leon3_serial",
|
|
.start = leon3_serial_init,
|
|
.stop = NULL,
|
|
.setbrg = leon3_serial_setbrg,
|
|
.putc = leon3_serial_putc,
|
|
.puts = default_serial_puts,
|
|
.getc = leon3_serial_getc,
|
|
.tstc = leon3_serial_tstc,
|
|
};
|
|
|
|
void leon3_serial_initialize(void)
|
|
{
|
|
serial_register(&leon3_serial_drv);
|
|
}
|
|
|
|
__weak struct serial_device *default_serial_console(void)
|
|
{
|
|
return &leon3_serial_drv;
|
|
}
|