136 lines
3.8 KiB
C
136 lines
3.8 KiB
C
/* system.c - system/hardware module for ti_lm3s6965 BSP */
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/*
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* Copyright (c) 2013-2015 Wind River Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of Wind River Systems nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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DESCRIPTION
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This module provides routines to initialize and support board-level hardware
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for the ti_lm3s6965 BSP.
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*/
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#include <nanokernel.h>
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#include <nanokernel/cpu.h>
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#include <cputype.h>
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#include <board.h>
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#include <drivers/uart.h>
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#if defined(CONFIG_PRINTK) || defined(CONFIG_STDOUT_CONSOLE)
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#define DO_CONSOLE_INIT
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#endif
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#define RCGC1 *((volatile uint32_t *)0x400FE104)
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#define RCGC1_UART0_EN 0x00000001
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#define RCGC1_UART1_EN 0x00000002
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#define RCGC1_UART2_EN 0x00000004
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#ifdef CONFIG_RUNTIME_NMI
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extern void _NmiInit(void);
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#define NMI_INIT() _NmiInit()
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#else
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#define NMI_INIT()
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#endif
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#if defined(DO_CONSOLE_INIT)
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/*******************************************************************************
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*
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* uartGenericInfoInit - initialize initialization information for one UART
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*
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* RETURNS: N/A
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*
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*/
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static inline void uartGenericInfoInit(struct uart_init_info *pInfo)
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{
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pInfo->sys_clk_freq = SYSCLK_DEFAULT_IOSC_HZ;
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pInfo->baud_rate = CONFIG_UART_CONSOLE_BAUDRATE;
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}
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#endif /* DO_CONSOLE_INIT */
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#if defined(DO_CONSOLE_INIT)
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/*******************************************************************************
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*
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* consoleInit - initialize target-only console
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*
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* Only used for debugging.
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*
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* RETURNS: N/A
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*
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*/
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#include <console/uart_console.h>
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static void consoleInit(void)
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{
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struct uart_init_info info;
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/* enable clock to UART0 */
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RCGC1 |= RCGC1_UART0_EN;
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uartGenericInfoInit(&info);
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info.regs = CONFIG_UART_CONSOLE_REGS;
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/* Only supported in polling mode, but init all info fields */
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info.irq = CONFIG_UART_CONSOLE_IRQ;
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info.int_pri = CONFIG_UART_CONSOLE_INT_PRI;
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uart_init(CONFIG_UART_CONSOLE_INDEX, &info);
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uartConsoleInit();
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}
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#else
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#define consoleInit() \
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do {/* nothing */ \
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} while ((0))
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#endif /* DO_CONSOLE_INIT */
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/*******************************************************************************
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*
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* _InitHardware - perform basic hardware initialization
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*
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* Initialize the interrupt controller device drivers and the
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* integrated 16550-compatible UART device driver.
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* Also initialize the timer device driver, if required.
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*
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* RETURNS: N/A
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*/
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void _InitHardware(void)
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{
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consoleInit(); /* NOP if not needed */
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NMI_INIT(); /* install default handler that simply resets the CPU
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* if configured in the kernel, NOP otherwise */
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}
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