mirror of https://github.com/marqs85/ossc.git
257 lines
9.8 KiB
C
257 lines
9.8 KiB
C
/******************************************************************************
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* *
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* License Agreement *
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* *
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* Copyright (c) 2007 Altera Corporation, San Jose, California, USA. *
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* All rights reserved. *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a *
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* copy of this software and associated documentation files (the "Software"), *
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* to deal in the Software without restriction, including without limitation *
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* the rights to use, copy, modify, merge, publish, distribute, sublicense, *
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* and/or sell copies of the Software, and to permit persons to whom the *
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* Software is furnished to do so, subject to the following conditions: *
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* *
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* The above copyright notice and this permission notice shall be included in *
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* all copies or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *
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* DEALINGS IN THE SOFTWARE. *
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* *
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* This agreement shall be governed in all respects by the laws of the State *
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* of California and by the laws of the United States of America. *
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* *
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******************************************************************************/
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#include <string.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <limits.h>
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#include <sys/stat.h>
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//#include "sys/alt_irq.h"
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#include "sys/alt_alarm.h"
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#include "sys/ioctl.h"
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#include "alt_types.h"
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#include "altera_avalon_jtag_uart_regs.h"
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#include "altera_avalon_jtag_uart.h"
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#include "sys/alt_log_printf.h"
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#ifndef ALTERA_AVALON_JTAG_UART_SMALL
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/* ----------------------------------------------------------- */
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/* ------------------------- FAST DRIVER --------------------- */
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/* ----------------------------------------------------------- */
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#ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT
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static void altera_avalon_jtag_uart_irq(void* context);
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#else
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static void altera_avalon_jtag_uart_irq(void* context, alt_u32 id);
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#endif
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static alt_u32 altera_avalon_jtag_uart_timeout(void* context);
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/*
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* Driver initialization code. Register interrupts and start a timer
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* which we can use to check whether the host is there.
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* Return 1 on sucessful IRQ register and 0 on failure.
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*/
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void altera_avalon_jtag_uart_init(altera_avalon_jtag_uart_state* sp,
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int irq_controller_id, int irq)
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{
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ALT_FLAG_CREATE(&sp->events, 0);
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ALT_SEM_CREATE(&sp->read_lock, 1);
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ALT_SEM_CREATE(&sp->write_lock, 1);
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/* enable read interrupts at the device */
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sp->irq_enable = ALTERA_AVALON_JTAG_UART_CONTROL_RE_MSK;
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IOWR_ALTERA_AVALON_JTAG_UART_CONTROL(sp->base, sp->irq_enable);
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/* register the interrupt handler */
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#ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT
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alt_ic_isr_register(irq_controller_id, irq, altera_avalon_jtag_uart_irq,
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sp, NULL);
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#else
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alt_irq_register(irq, sp, altera_avalon_jtag_uart_irq);
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#endif
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/* Register an alarm to go off every second to check for presence of host */
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sp->host_inactive = 0;
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if (alt_alarm_start(&sp->alarm, alt_ticks_per_second(),
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&altera_avalon_jtag_uart_timeout, sp) < 0)
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{
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/* If we can't set the alarm then record "don't know if host present"
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* and behave as though the host is present.
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*/
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sp->timeout = INT_MAX;
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}
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/* ALT_LOG - see altera_hal/HAL/inc/sys/alt_log_printf.h */
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ALT_LOG_JTAG_UART_ALARM_REGISTER(sp, sp->base);
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}
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/*
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* Interrupt routine
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*/
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#ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT
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static void altera_avalon_jtag_uart_irq(void* context)
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#else
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static void altera_avalon_jtag_uart_irq(void* context, alt_u32 id)
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#endif
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{
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altera_avalon_jtag_uart_state* sp = (altera_avalon_jtag_uart_state*) context;
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unsigned int base = sp->base;
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/* ALT_LOG - see altera_hal/HAL/inc/sys/alt_log_printf.h */
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ALT_LOG_JTAG_UART_ISR_FUNCTION(base, sp);
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for ( ; ; )
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{
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unsigned int control = IORD_ALTERA_AVALON_JTAG_UART_CONTROL(base);
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/* Return once nothing more to do */
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if ((control & (ALTERA_AVALON_JTAG_UART_CONTROL_RI_MSK | ALTERA_AVALON_JTAG_UART_CONTROL_WI_MSK)) == 0)
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break;
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if (control & ALTERA_AVALON_JTAG_UART_CONTROL_RI_MSK)
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{
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/* process a read irq. Start by assuming that there is data in the
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* receive FIFO (otherwise why would we have been interrupted?)
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*/
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unsigned int data = 1 << ALTERA_AVALON_JTAG_UART_DATA_RAVAIL_OFST;
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for ( ; ; )
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{
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/* Check whether there is space in the buffer. If not then we must not
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* read any characters from the buffer as they will be lost.
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*/
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unsigned int next = (sp->rx_in + 1) % ALTERA_AVALON_JTAG_UART_BUF_LEN;
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if (next == sp->rx_out)
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break;
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/* Try to remove a character from the FIFO and find out whether there
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* are any more characters remaining.
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*/
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data = IORD_ALTERA_AVALON_JTAG_UART_DATA(base);
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if ((data & ALTERA_AVALON_JTAG_UART_DATA_RVALID_MSK) == 0)
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break;
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sp->rx_buf[sp->rx_in] = (data & ALTERA_AVALON_JTAG_UART_DATA_DATA_MSK) >> ALTERA_AVALON_JTAG_UART_DATA_DATA_OFST;
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sp->rx_in = (sp->rx_in + 1) % ALTERA_AVALON_JTAG_UART_BUF_LEN;
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/* Post an event to notify jtag_uart_read that a character has been read */
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ALT_FLAG_POST (sp->events, ALT_JTAG_UART_READ_RDY, OS_FLAG_SET);
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}
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if (data & ALTERA_AVALON_JTAG_UART_DATA_RAVAIL_MSK)
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{
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/* If there is still data available here then the buffer is full
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* so turn off receive interrupts until some space becomes available.
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*/
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sp->irq_enable &= ~ALTERA_AVALON_JTAG_UART_CONTROL_RE_MSK;
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IOWR_ALTERA_AVALON_JTAG_UART_CONTROL(base, sp->irq_enable);
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/* Dummy read to ensure IRQ is cleared prior to ISR completion */
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IORD_ALTERA_AVALON_JTAG_UART_CONTROL(base);
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}
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}
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if (control & ALTERA_AVALON_JTAG_UART_CONTROL_WI_MSK)
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{
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/* process a write irq */
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unsigned int space = (control & ALTERA_AVALON_JTAG_UART_CONTROL_WSPACE_MSK) >> ALTERA_AVALON_JTAG_UART_CONTROL_WSPACE_OFST;
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while (space > 0 && sp->tx_out != sp->tx_in)
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{
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IOWR_ALTERA_AVALON_JTAG_UART_DATA(base, sp->tx_buf[sp->tx_out]);
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sp->tx_out = (sp->tx_out + 1) % ALTERA_AVALON_JTAG_UART_BUF_LEN;
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/* Post an event to notify jtag_uart_write that a character has been written */
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ALT_FLAG_POST (sp->events, ALT_JTAG_UART_WRITE_RDY, OS_FLAG_SET);
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space--;
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}
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if (space > 0)
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{
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/* If we don't have any more data available then turn off the TX interrupt */
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sp->irq_enable &= ~ALTERA_AVALON_JTAG_UART_CONTROL_WE_MSK;
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IOWR_ALTERA_AVALON_JTAG_UART_CONTROL(sp->base, sp->irq_enable);
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/* Dummy read to ensure IRQ is cleared prior to ISR completion */
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IORD_ALTERA_AVALON_JTAG_UART_CONTROL(base);
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}
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}
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}
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}
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/*
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* Timeout routine is called every second
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*/
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static alt_u32
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altera_avalon_jtag_uart_timeout(void* context)
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{
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altera_avalon_jtag_uart_state* sp = (altera_avalon_jtag_uart_state *) context;
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unsigned int control = IORD_ALTERA_AVALON_JTAG_UART_CONTROL(sp->base);
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if (control & ALTERA_AVALON_JTAG_UART_CONTROL_AC_MSK)
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{
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IOWR_ALTERA_AVALON_JTAG_UART_CONTROL(sp->base, sp->irq_enable | ALTERA_AVALON_JTAG_UART_CONTROL_AC_MSK);
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sp->host_inactive = 0;
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}
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else if (sp->host_inactive < INT_MAX - 2) {
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sp->host_inactive++;
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if (sp->host_inactive >= sp->timeout) {
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/* Post an event to indicate host is inactive (for jtag_uart_read */
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ALT_FLAG_POST (sp->events, ALT_JTAG_UART_TIMEOUT, OS_FLAG_SET);
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}
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}
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return alt_ticks_per_second();
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}
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/*
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* The close() routine is implemented to drain the JTAG UART transmit buffer
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* when not in "small" mode. This routine will wait for transimt data to be
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* emptied unless a timeout from host-activity occurs. If the driver flags
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* have been set to non-blocking mode, this routine will exit immediately if
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* any data remains. This routine should be called indirectly (i.e. though
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* the C library close() routine) so that the file descriptor associated
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* with the relevant stream (i.e. stdout) can be closed as well. This routine
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* does not manage file descriptors.
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*
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* The close routine is not implemented for the small driver; instead it will
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* map to null. This is because the small driver simply waits while characters
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* are transmitted; there is no interrupt-serviced buffer to empty
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*/
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int altera_avalon_jtag_uart_close(altera_avalon_jtag_uart_state* sp, int flags)
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{
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/*
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* Wait for all transmit data to be emptied by the JTAG UART ISR, or
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* for a host-inactivity timeout, in which case transmit data will be lost
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*/
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while ( (sp->tx_out != sp->tx_in) && (sp->host_inactive < sp->timeout) ) {
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if (flags & O_NONBLOCK) {
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return -EWOULDBLOCK;
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}
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}
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return 0;
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}
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#endif /* !ALTERA_AVALON_JTAG_UART_SMALL */
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