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/* 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;
}
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