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/*
* (C) Copyright 2009 SAMSUNG Electronics
* Minkyu Kang <mk7.kang@samsung.com>
* Heungjun Kim <riverful.kim@samsung.com>
*
* based on drivers/serial/s3c64xx.c
*
* 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 <types.h>
#include <uart.h>
#include <arch/io.h>
#include <console/console.h> /* for __console definition */
#include <cpu/ti/am335x/uart.h>
#define RX_FIFO_COUNT_MASK 0xff
#define RX_FIFO_FULL_MASK (1 << 8)
#define TX_FIFO_FULL_MASK (1 << 24)
/*
* Initialise the serial port with the given baudrate. The settings
* are always 8 data bits, no parity, 1 stop bit, no start bits.
*/
static void am335x_uart_init_dev(void)
{
/* FIXME: implement this
* ref: section 19.4.1.1.1 for reset
* ref: section 19.4.1.1.2 for FIFO, skip DMA
* ref: section 19.4.1.1.3 for baud rate, skip
* interrupts and protocol stuff.
* */
#if 0
struct s5p_uart *uart = (struct s5p_uart *)base_port;
// TODO initialize with correct peripheral id by base_port.
exynos_pinmux_config(PERIPH_ID_UART3, PINMUX_FLAG_NONE);
/* enable FIFOs */
writel(0x1, &uart->ufcon);
writel(0, &uart->umcon);
/* 8N1 */
writel(0x3, &uart->ulcon);
/* No interrupts, no DMA, pure polling */
writel(0x245, &uart->ucon);
serial_setbrg_dev();
#endif
}
/*
* Read a single byte from the serial port. Returns 1 on success, 0
* otherwise. When the function is succesfull, the character read is
* written into its argument c.
*/
static unsigned char am335x_uart_rx_byte(void)
{
/* FIXME: stub */
#if 0
struct s5p_uart *uart = (struct s5p_uart *)base_port;
/* wait for character to arrive */
while (!(readl(&uart->ufstat) & (RX_FIFO_COUNT_MASK |
RX_FIFO_FULL_MASK))) {
if (exynos5_uart_err_check(0))
return 0;
}
return readb(&uart->urxh) & 0xff;
#endif
return 0xaa;
}
/*
* Output a single byte to the serial port.
*/
static void am335x_uart_tx_byte(unsigned char data)
{
/* FIXME: stub */
#if 0
struct s5p_uart *uart = (struct s5p_uart *)base_port;
/* wait for room in the tx FIFO */
while ((readl(&uart->ufstat) & TX_FIFO_FULL_MASK)) {
if (exynos5_uart_err_check(1))
return;
}
writeb(data, &uart->utxh);
#endif
}
uint32_t uartmem_getbaseaddr(void)
{
return CONFIG_CONSOLE_SERIAL_UART_ADDRESS;
}
#if !defined(__PRE_RAM__)
static const struct console_driver exynos5_uart_console __console = {
.init = am335x_uart_init_dev,
.tx_byte = am335x_uart_tx_byte,
.rx_byte = am335x_uart_rx_byte,
};
#else
void uart_init(void)
{
am335x_uart_init_dev();
}
unsigned char uart_rx_byte(void)
{
return am335x_uart_rx_byte();
}
void uart_tx_byte(unsigned char data)
{
am335x_uart_tx_byte(data);
}
void uart_tx_flush(void) {
}
#endif
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