/* system.c - system/hardware module for ti_lm3s6965 BSP */

/*
 * Copyright (c) 2013-2015 Wind River Systems, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1) Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2) Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3) Neither the name of Wind River Systems nor the names of its contributors
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
DESCRIPTION
This module provides routines to initialize and support board-level hardware
for the ti_lm3s6965 BSP.
*/

#include <nanokernel.h>
#include <nanokernel/cpu.h>
#include <cputype.h>
#include <board.h>
#include <drivers/uart.h>

#if defined(CONFIG_PRINTK) || defined(CONFIG_STDOUT_CONSOLE)
#define DO_CONSOLE_INIT
#endif

#define RCGC1 *((volatile uint32_t *)0x400FE104)

#define RCGC1_UART0_EN 0x00000001
#define RCGC1_UART1_EN 0x00000002
#define RCGC1_UART2_EN 0x00000004

#ifdef CONFIG_RUNTIME_NMI
extern void _NmiInit(void);
#define NMI_INIT() _NmiInit()
#else
#define NMI_INIT()
#endif

#if defined(DO_CONSOLE_INIT)

/*******************************************************************************
*
* uartGenericInfoInit - initialize initialization information for one UART
*
* RETURNS: N/A
*
*/

static inline void uartGenericInfoInit(struct uart_init_info *pInfo)
{
	pInfo->sys_clk_freq = SYSCLK_DEFAULT_IOSC_HZ;
	pInfo->baud_rate = CONFIG_UART_CONSOLE_BAUDRATE;
}

#endif /* DO_CONSOLE_INIT */

#if defined(DO_CONSOLE_INIT)

/*******************************************************************************
*
* consoleInit - initialize target-only console
*
* Only used for debugging.
*
* RETURNS: N/A
*
*/

#include <console/uart_console.h>

static void consoleInit(void)
{
	struct uart_init_info info;

	/* enable clock to UART0 */
	RCGC1 |= RCGC1_UART0_EN;

	uartGenericInfoInit(&info);
	info.regs = CONFIG_UART_CONSOLE_REGS;

	/* Only supported in polling mode, but init all info fields */
	info.irq = CONFIG_UART_CONSOLE_IRQ;
	info.int_pri = CONFIG_UART_CONSOLE_INT_PRI;

	uart_init(CONFIG_UART_CONSOLE_INDEX, &info);

	uart_console_init();
}

#else
#define consoleInit()     \
	do {/* nothing */ \
	} while ((0))
#endif /* DO_CONSOLE_INIT */

/*******************************************************************************
*
* _InitHardware - perform basic hardware initialization
*
* Initialize the interrupt controller device drivers and the
* integrated 16550-compatible UART device driver.
* Also initialize the timer device driver, if required.
*
* RETURNS: N/A
*/

void _InitHardware(void)
{
	consoleInit(); /* NOP if not needed */

	/* Install default handler that simply resets the CPU
	 * if configured in the kernel, NOP otherwise
	 */
	NMI_INIT();
}