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/*
* (C) Copyright 2010,2011
* NVIDIA Corporation <www.nvidia.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 <ns16550.h>
#include <asm/io.h>
#include <asm/arch/tegra2.h>
#include "serial_tegra2.h"
static void setup_uart(struct uart_ctlr *u)
{
u32 reg;
/* Prepare the divisor value */
reg = NVRM_PLLP_FIXED_FREQ_KHZ * 1000 / NV_DEFAULT_DEBUG_BAUD / 16;
/* Set up UART parameters */
writel(UART_LCR_DLAB, &u->uart_lcr);
writel(reg, &u->uart_thr_dlab_0);
writel(0, &u->uart_ier_dlab_0);
writel(0, &u->uart_lcr); /* clear DLAB */
writel((UART_FCR_TRIGGER_3 | UART_FCR_FIFO_EN | \
UART_FCR_CLEAR_XMIT | UART_FCR_CLEAR_RCVR), &u->uart_iir_fcr);
writel(0, &u->uart_ier_dlab_0);
writel(UART_LCR_WLS_8, &u->uart_lcr); /* 8N1 */
writel(UART_MCR_RTS, &u->uart_mcr);
writel(0, &u->uart_msr);
writel(0, &u->uart_spr);
writel(0, &u->uart_irda_csr);
writel(0, &u->uart_asr);
writel((UART_FCR_TRIGGER_3 | UART_FCR_FIFO_EN), &u->uart_iir_fcr);
/* Flush any old characters out of the RX FIFO */
reg = readl(&u->uart_lsr);
while (reg & UART_LSR_DR) {
reg = readl(&u->uart_thr_dlab_0);
reg = readl(&u->uart_lsr);
}
}
/*
* Routine: uart_init
* Description: init the UART clocks, muxes, and baudrate/parity/etc.
*/
void uart_init(void)
{
struct uart_ctlr *uart = (struct uart_ctlr *)NV_PA_APB_UARTD_BASE;
#if defined(CONFIG_TEGRA2_ENABLE_UARTD)
setup_uart(uart);
#endif /* CONFIG_TEGRA2_ENABLE_UARTD */
#if defined(CONFIG_TEGRA2_ENABLE_UARTA)
uart = (struct uart_ctlr *)NV_PA_APB_UARTA_BASE;
setup_uart(uart);
#endif /* CONFIG_TEGRA2_ENABLE_UARTA */
}
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