82 lines
2.7 KiB
C
82 lines
2.7 KiB
C
/*
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* Copyright (c) 2014-2015, 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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#include <nanokernel.h>
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#include <nanokernel/cpu.h>
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#include <sections.h>
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#include <misc/__assert.h>
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#include <stdint.h>
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#include <misc/util.h>
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#include <string.h>
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#include <board.h>
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#include <drivers/uart.h>
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#define NSIM_UART_DATA 0
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#define NSIM_UART_STATUS 1
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#define DATA_REG(n) (uart[n].regs + NSIM_UART_DATA)
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#define STATUS_REG(n) (uart[n].regs + NSIM_UART_STATUS)
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#define TXEMPTY 0x80 /* Transmit FIFO empty and next character can be sent */
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struct uart {
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uint32_t regs; /* MM base address */
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};
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static struct uart __noinit uart[CONFIG_UART_NUM_SYSTEM_PORTS];
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/*
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* uart_init - initialize fake serial port
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* @which: port number
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* @init_info: pointer to initialization information
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*/
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void uart_init(int which, const struct uart_init_info * const init_info)
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{
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int key = irq_lock();
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uart[which].regs = init_info->regs;
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irq_unlock(key);
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}
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/*
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* uart_poll_out - output a character to serial port
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* @port: port number
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* @c: character to output
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*/
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unsigned char uart_poll_out(int port, unsigned char c)
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{
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/* wait for transmitter to ready to accept a character */
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while ((_arc_v2_aux_reg_read(STATUS_REG(port)) & TXEMPTY) == 0)
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;
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_arc_v2_aux_reg_write(DATA_REG(port), c);
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return c;
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}
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