// SPDX-License-Identifier: GPL-2.0+
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/************************************************************************
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* Copyright 2003 Digi International (www.digi.com)
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*
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* Copyright (C) 2004 IBM Corporation. All rights reserved.
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*
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* Contact Information:
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* Scott H Kilau <Scott_Kilau@digi.com>
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* Ananda Venkatarman <mansarov@us.ibm.com>
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* Modifications:
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* 01/19/06: changed jsm_input routine to use the dynamically allocated
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* tty_buffer changes. Contributors: Scott Kilau and Ananda V.
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***********************************************************************/
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/serial_reg.h>
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#include <linux/delay.h> /* For udelay */
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include "jsm.h"
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static DECLARE_BITMAP(linemap, MAXLINES);
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static void jsm_carrier(struct jsm_channel *ch);
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static inline int jsm_get_mstat(struct jsm_channel *ch)
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{
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unsigned char mstat;
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int result;
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jsm_dbg(IOCTL, &ch->ch_bd->pci_dev, "start\n");
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mstat = (ch->ch_mostat | ch->ch_mistat);
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result = 0;
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if (mstat & UART_MCR_DTR)
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result |= TIOCM_DTR;
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if (mstat & UART_MCR_RTS)
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result |= TIOCM_RTS;
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if (mstat & UART_MSR_CTS)
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result |= TIOCM_CTS;
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if (mstat & UART_MSR_DSR)
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result |= TIOCM_DSR;
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if (mstat & UART_MSR_RI)
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result |= TIOCM_RI;
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if (mstat & UART_MSR_DCD)
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result |= TIOCM_CD;
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jsm_dbg(IOCTL, &ch->ch_bd->pci_dev, "finish\n");
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return result;
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}
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static unsigned int jsm_tty_tx_empty(struct uart_port *port)
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{
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return TIOCSER_TEMT;
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}
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/*
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* Return modem signals to ld.
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*/
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static unsigned int jsm_tty_get_mctrl(struct uart_port *port)
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{
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int result;
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struct jsm_channel *channel =
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container_of(port, struct jsm_channel, uart_port);
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jsm_dbg(IOCTL, &channel->ch_bd->pci_dev, "start\n");
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result = jsm_get_mstat(channel);
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if (result < 0)
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return -ENXIO;
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jsm_dbg(IOCTL, &channel->ch_bd->pci_dev, "finish\n");
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return result;
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}
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/*
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* jsm_set_modem_info()
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*
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* Set modem signals, called by ld.
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*/
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static void jsm_tty_set_mctrl(struct uart_port *port, unsigned int mctrl)
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{
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struct jsm_channel *channel =
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container_of(port, struct jsm_channel, uart_port);
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jsm_dbg(IOCTL, &channel->ch_bd->pci_dev, "start\n");
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if (mctrl & TIOCM_RTS)
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channel->ch_mostat |= UART_MCR_RTS;
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else
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channel->ch_mostat &= ~UART_MCR_RTS;
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if (mctrl & TIOCM_DTR)
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channel->ch_mostat |= UART_MCR_DTR;
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else
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channel->ch_mostat &= ~UART_MCR_DTR;
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channel->ch_bd->bd_ops->assert_modem_signals(channel);
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jsm_dbg(IOCTL, &channel->ch_bd->pci_dev, "finish\n");
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udelay(10);
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}
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/*
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* jsm_tty_write()
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*
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* Take data from the user or kernel and send it out to the FEP.
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* In here exists all the Transparent Print magic as well.
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*/
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static void jsm_tty_write(struct uart_port *port)
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{
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struct jsm_channel *channel;
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channel = container_of(port, struct jsm_channel, uart_port);
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channel->ch_bd->bd_ops->copy_data_from_queue_to_uart(channel);
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}
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static void jsm_tty_start_tx(struct uart_port *port)
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{
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struct jsm_channel *channel =
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container_of(port, struct jsm_channel, uart_port);
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jsm_dbg(IOCTL, &channel->ch_bd->pci_dev, "start\n");
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channel->ch_flags &= ~(CH_STOP);
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jsm_tty_write(port);
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jsm_dbg(IOCTL, &channel->ch_bd->pci_dev, "finish\n");
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}
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static void jsm_tty_stop_tx(struct uart_port *port)
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{
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struct jsm_channel *channel =
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container_of(port, struct jsm_channel, uart_port);
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jsm_dbg(IOCTL, &channel->ch_bd->pci_dev, "start\n");
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channel->ch_flags |= (CH_STOP);
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jsm_dbg(IOCTL, &channel->ch_bd->pci_dev, "finish\n");
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}
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static void jsm_tty_send_xchar(struct uart_port *port, char ch)
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{
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unsigned long lock_flags;
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struct jsm_channel *channel =
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container_of(port, struct jsm_channel, uart_port);
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struct ktermios *termios;
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spin_lock_irqsave(&port->lock, lock_flags);
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termios = &port->state->port.tty->termios;
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if (ch == termios->c_cc[VSTART])
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channel->ch_bd->bd_ops->send_start_character(channel);
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if (ch == termios->c_cc[VSTOP])
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channel->ch_bd->bd_ops->send_stop_character(channel);
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spin_unlock_irqrestore(&port->lock, lock_flags);
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}
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static void jsm_tty_stop_rx(struct uart_port *port)
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{
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struct jsm_channel *channel =
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container_of(port, struct jsm_channel, uart_port);
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channel->ch_bd->bd_ops->disable_receiver(channel);
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}
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static void jsm_tty_break(struct uart_port *port, int break_state)
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{
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unsigned long lock_flags;
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struct jsm_channel *channel =
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container_of(port, struct jsm_channel, uart_port);
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spin_lock_irqsave(&port->lock, lock_flags);
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if (break_state == -1)
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channel->ch_bd->bd_ops->send_break(channel);
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else
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channel->ch_bd->bd_ops->clear_break(channel);
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spin_unlock_irqrestore(&port->lock, lock_flags);
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}
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static int jsm_tty_open(struct uart_port *port)
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{
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unsigned long lock_flags;
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struct jsm_board *brd;
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struct jsm_channel *channel =
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container_of(port, struct jsm_channel, uart_port);
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struct ktermios *termios;
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/* Get board pointer from our array of majors we have allocated */
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brd = channel->ch_bd;
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/*
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* Allocate channel buffers for read/write/error.
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* Set flag, so we don't get trounced on.
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*/
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channel->ch_flags |= (CH_OPENING);
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/* Drop locks, as malloc with GFP_KERNEL can sleep */
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if (!channel->ch_rqueue) {
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channel->ch_rqueue = kzalloc(RQUEUESIZE, GFP_KERNEL);
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if (!channel->ch_rqueue) {
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jsm_dbg(INIT, &channel->ch_bd->pci_dev,
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"unable to allocate read queue buf\n");
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return -ENOMEM;
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}
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}
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if (!channel->ch_equeue) {
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channel->ch_equeue = kzalloc(EQUEUESIZE, GFP_KERNEL);
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if (!channel->ch_equeue) {
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jsm_dbg(INIT, &channel->ch_bd->pci_dev,
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"unable to allocate error queue buf\n");
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return -ENOMEM;
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}
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}
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channel->ch_flags &= ~(CH_OPENING);
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/*
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* Initialize if neither terminal is open.
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*/
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jsm_dbg(OPEN, &channel->ch_bd->pci_dev,
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"jsm_open: initializing channel in open...\n");
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/*
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* Flush input queues.
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*/
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channel->ch_r_head = channel->ch_r_tail = 0;
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channel->ch_e_head = channel->ch_e_tail = 0;
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brd->bd_ops->flush_uart_write(channel);
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brd->bd_ops->flush_uart_read(channel);
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channel->ch_flags = 0;
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channel->ch_cached_lsr = 0;
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channel->ch_stops_sent = 0;
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spin_lock_irqsave(&port->lock, lock_flags);
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termios = &port->state->port.tty->termios;
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channel->ch_c_cflag = termios->c_cflag;
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channel->ch_c_iflag = termios->c_iflag;
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channel->ch_c_oflag = termios->c_oflag;
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channel->ch_c_lflag = termios->c_lflag;
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channel->ch_startc = termios->c_cc[VSTART];
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channel->ch_stopc = termios->c_cc[VSTOP];
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/* Tell UART to init itself */
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brd->bd_ops->uart_init(channel);
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/*
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* Run param in case we changed anything
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*/
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brd->bd_ops->param(channel);
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jsm_carrier(channel);
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channel->ch_open_count++;
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spin_unlock_irqrestore(&port->lock, lock_flags);
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jsm_dbg(OPEN, &channel->ch_bd->pci_dev, "finish\n");
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return 0;
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}
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static void jsm_tty_close(struct uart_port *port)
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{
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struct jsm_board *bd;
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struct jsm_channel *channel =
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container_of(port, struct jsm_channel, uart_port);
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jsm_dbg(CLOSE, &channel->ch_bd->pci_dev, "start\n");
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bd = channel->ch_bd;
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channel->ch_flags &= ~(CH_STOPI);
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channel->ch_open_count--;
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/*
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* If we have HUPCL set, lower DTR and RTS
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*/
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if (channel->ch_c_cflag & HUPCL) {
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jsm_dbg(CLOSE, &channel->ch_bd->pci_dev,
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"Close. HUPCL set, dropping DTR/RTS\n");
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/* Drop RTS/DTR */
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channel->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS);
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bd->bd_ops->assert_modem_signals(channel);
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}
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/* Turn off UART interrupts for this port */
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channel->ch_bd->bd_ops->uart_off(channel);
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jsm_dbg(CLOSE, &channel->ch_bd->pci_dev, "finish\n");
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}
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static void jsm_tty_set_termios(struct uart_port *port,
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struct ktermios *termios,
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struct ktermios *old_termios)
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{
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unsigned long lock_flags;
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struct jsm_channel *channel =
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container_of(port, struct jsm_channel, uart_port);
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spin_lock_irqsave(&port->lock, lock_flags);
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channel->ch_c_cflag = termios->c_cflag;
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channel->ch_c_iflag = termios->c_iflag;
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channel->ch_c_oflag = termios->c_oflag;
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channel->ch_c_lflag = termios->c_lflag;
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channel->ch_startc = termios->c_cc[VSTART];
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channel->ch_stopc = termios->c_cc[VSTOP];
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channel->ch_bd->bd_ops->param(channel);
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jsm_carrier(channel);
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spin_unlock_irqrestore(&port->lock, lock_flags);
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}
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static const char *jsm_tty_type(struct uart_port *port)
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{
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return "jsm";
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}
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static void jsm_tty_release_port(struct uart_port *port)
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{
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}
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static int jsm_tty_request_port(struct uart_port *port)
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{
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return 0;
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}
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static void jsm_config_port(struct uart_port *port, int flags)
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{
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port->type = PORT_JSM;
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}
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static const struct uart_ops jsm_ops = {
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.tx_empty = jsm_tty_tx_empty,
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.set_mctrl = jsm_tty_set_mctrl,
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.get_mctrl = jsm_tty_get_mctrl,
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.stop_tx = jsm_tty_stop_tx,
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.start_tx = jsm_tty_start_tx,
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.send_xchar = jsm_tty_send_xchar,
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.stop_rx = jsm_tty_stop_rx,
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.break_ctl = jsm_tty_break,
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.startup = jsm_tty_open,
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.shutdown = jsm_tty_close,
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.set_termios = jsm_tty_set_termios,
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.type = jsm_tty_type,
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.release_port = jsm_tty_release_port,
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.request_port = jsm_tty_request_port,
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.config_port = jsm_config_port,
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};
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/*
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* jsm_tty_init()
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*
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* Init the tty subsystem. Called once per board after board has been
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* downloaded and init'ed.
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*/
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int jsm_tty_init(struct jsm_board *brd)
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{
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int i;
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void __iomem *vaddr;
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struct jsm_channel *ch;
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if (!brd)
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return -ENXIO;
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jsm_dbg(INIT, &brd->pci_dev, "start\n");
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/*
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* Initialize board structure elements.
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*/
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brd->nasync = brd->maxports;
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/*
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* Allocate channel memory that might not have been allocated
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* when the driver was first loaded.
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*/
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for (i = 0; i < brd->nasync; i++) {
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if (!brd->channels[i]) {
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/*
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* Okay to malloc with GFP_KERNEL, we are not at
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* interrupt context, and there are no locks held.
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*/
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brd->channels[i] = kzalloc(sizeof(struct jsm_channel), GFP_KERNEL);
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if (!brd->channels[i]) {
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jsm_dbg(CORE, &brd->pci_dev,
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"%s:%d Unable to allocate memory for channel struct\n",
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__FILE__, __LINE__);
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}
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}
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}
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ch = brd->channels[0];
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vaddr = brd->re_map_membase;
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/* Set up channel variables */
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for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) {
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if (!brd->channels[i])
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continue;
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spin_lock_init(&ch->ch_lock);
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if (brd->bd_uart_offset == 0x200)
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ch->ch_neo_uart = vaddr + (brd->bd_uart_offset * i);
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else
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ch->ch_cls_uart = vaddr + (brd->bd_uart_offset * i);
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ch->ch_bd = brd;
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ch->ch_portnum = i;
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/* .25 second delay */
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ch->ch_close_delay = 250;
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init_waitqueue_head(&ch->ch_flags_wait);
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}
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jsm_dbg(INIT, &brd->pci_dev, "finish\n");
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return 0;
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}
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int jsm_uart_port_init(struct jsm_board *brd)
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{
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int i, rc;
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unsigned int line;
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if (!brd)
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return -ENXIO;
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jsm_dbg(INIT, &brd->pci_dev, "start\n");
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/*
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* Initialize board structure elements.
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*/
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brd->nasync = brd->maxports;
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/* Set up channel variables */
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for (i = 0; i < brd->nasync; i++) {
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if (!brd->channels[i])
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continue;
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brd->channels[i]->uart_port.irq = brd->irq;
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brd->channels[i]->uart_port.uartclk = 14745600;
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brd->channels[i]->uart_port.type = PORT_JSM;
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brd->channels[i]->uart_port.iotype = UPIO_MEM;
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brd->channels[i]->uart_port.membase = brd->re_map_membase;
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brd->channels[i]->uart_port.fifosize = 16;
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brd->channels[i]->uart_port.ops = &jsm_ops;
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line = find_first_zero_bit(linemap, MAXLINES);
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if (line >= MAXLINES) {
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printk(KERN_INFO "jsm: linemap is full, added device failed\n");
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continue;
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} else
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set_bit(line, linemap);
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brd->channels[i]->uart_port.line = line;
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rc = uart_add_one_port(&jsm_uart_driver, &brd->channels[i]->uart_port);
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if (rc) {
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printk(KERN_INFO "jsm: Port %d failed. Aborting...\n", i);
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return rc;
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} else
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printk(KERN_INFO "jsm: Port %d added\n", i);
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}
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jsm_dbg(INIT, &brd->pci_dev, "finish\n");
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return 0;
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}
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int jsm_remove_uart_port(struct jsm_board *brd)
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{
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int i;
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struct jsm_channel *ch;
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if (!brd)
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return -ENXIO;
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jsm_dbg(INIT, &brd->pci_dev, "start\n");
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/*
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* Initialize board structure elements.
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*/
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brd->nasync = brd->maxports;
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/* Set up channel variables */
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for (i = 0; i < brd->nasync; i++) {
|
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if (!brd->channels[i])
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continue;
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ch = brd->channels[i];
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clear_bit(ch->uart_port.line, linemap);
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uart_remove_one_port(&jsm_uart_driver, &brd->channels[i]->uart_port);
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}
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jsm_dbg(INIT, &brd->pci_dev, "finish\n");
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return 0;
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}
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void jsm_input(struct jsm_channel *ch)
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{
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struct jsm_board *bd;
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struct tty_struct *tp;
|
struct tty_port *port;
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u32 rmask;
|
u16 head;
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u16 tail;
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int data_len;
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unsigned long lock_flags;
|
int len = 0;
|
int s = 0;
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int i = 0;
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jsm_dbg(READ, &ch->ch_bd->pci_dev, "start\n");
|
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port = &ch->uart_port.state->port;
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tp = port->tty;
|
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bd = ch->ch_bd;
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if (!bd)
|
return;
|
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spin_lock_irqsave(&ch->ch_lock, lock_flags);
|
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/*
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*Figure the number of characters in the buffer.
|
*Exit immediately if none.
|
*/
|
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rmask = RQUEUEMASK;
|
|
head = ch->ch_r_head & rmask;
|
tail = ch->ch_r_tail & rmask;
|
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data_len = (head - tail) & rmask;
|
if (data_len == 0) {
|
spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
|
return;
|
}
|
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jsm_dbg(READ, &ch->ch_bd->pci_dev, "start\n");
|
|
/*
|
*If the device is not open, or CREAD is off, flush
|
*input data and return immediately.
|
*/
|
if (!tp || !C_CREAD(tp)) {
|
|
jsm_dbg(READ, &ch->ch_bd->pci_dev,
|
"input. dropping %d bytes on port %d...\n",
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data_len, ch->ch_portnum);
|
ch->ch_r_head = tail;
|
|
/* Force queue flow control to be released, if needed */
|
jsm_check_queue_flow_control(ch);
|
|
spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
|
return;
|
}
|
|
/*
|
* If we are throttled, simply don't read any data.
|
*/
|
if (ch->ch_flags & CH_STOPI) {
|
spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
|
jsm_dbg(READ, &ch->ch_bd->pci_dev,
|
"Port %d throttled, not reading any data. head: %x tail: %x\n",
|
ch->ch_portnum, head, tail);
|
return;
|
}
|
|
jsm_dbg(READ, &ch->ch_bd->pci_dev, "start 2\n");
|
|
len = tty_buffer_request_room(port, data_len);
|
|
/*
|
* len now contains the most amount of data we can copy,
|
* bounded either by the flip buffer size or the amount
|
* of data the card actually has pending...
|
*/
|
while (len) {
|
s = ((head >= tail) ? head : RQUEUESIZE) - tail;
|
s = min(s, len);
|
|
if (s <= 0)
|
break;
|
|
/*
|
* If conditions are such that ld needs to see all
|
* UART errors, we will have to walk each character
|
* and error byte and send them to the buffer one at
|
* a time.
|
*/
|
|
if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) {
|
for (i = 0; i < s; i++) {
|
/*
|
* Give the Linux ld the flags in the
|
* format it likes.
|
*/
|
if (*(ch->ch_equeue +tail +i) & UART_LSR_BI)
|
tty_insert_flip_char(port, *(ch->ch_rqueue +tail +i), TTY_BREAK);
|
else if (*(ch->ch_equeue +tail +i) & UART_LSR_PE)
|
tty_insert_flip_char(port, *(ch->ch_rqueue +tail +i), TTY_PARITY);
|
else if (*(ch->ch_equeue +tail +i) & UART_LSR_FE)
|
tty_insert_flip_char(port, *(ch->ch_rqueue +tail +i), TTY_FRAME);
|
else
|
tty_insert_flip_char(port, *(ch->ch_rqueue +tail +i), TTY_NORMAL);
|
}
|
} else {
|
tty_insert_flip_string(port, ch->ch_rqueue + tail, s);
|
}
|
tail += s;
|
len -= s;
|
/* Flip queue if needed */
|
tail &= rmask;
|
}
|
|
ch->ch_r_tail = tail & rmask;
|
ch->ch_e_tail = tail & rmask;
|
jsm_check_queue_flow_control(ch);
|
spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
|
|
/* Tell the tty layer its okay to "eat" the data now */
|
tty_flip_buffer_push(port);
|
|
jsm_dbg(IOCTL, &ch->ch_bd->pci_dev, "finish\n");
|
}
|
|
static void jsm_carrier(struct jsm_channel *ch)
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{
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struct jsm_board *bd;
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int virt_carrier = 0;
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int phys_carrier = 0;
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jsm_dbg(CARR, &ch->ch_bd->pci_dev, "start\n");
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bd = ch->ch_bd;
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if (!bd)
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return;
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if (ch->ch_mistat & UART_MSR_DCD) {
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jsm_dbg(CARR, &ch->ch_bd->pci_dev, "mistat: %x D_CD: %x\n",
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ch->ch_mistat, ch->ch_mistat & UART_MSR_DCD);
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phys_carrier = 1;
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}
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if (ch->ch_c_cflag & CLOCAL)
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virt_carrier = 1;
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jsm_dbg(CARR, &ch->ch_bd->pci_dev, "DCD: physical: %d virt: %d\n",
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phys_carrier, virt_carrier);
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/*
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* Test for a VIRTUAL carrier transition to HIGH.
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*/
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if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) {
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/*
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* When carrier rises, wake any threads waiting
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* for carrier in the open routine.
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*/
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jsm_dbg(CARR, &ch->ch_bd->pci_dev, "carrier: virt DCD rose\n");
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if (waitqueue_active(&(ch->ch_flags_wait)))
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wake_up_interruptible(&ch->ch_flags_wait);
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}
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/*
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* Test for a PHYSICAL carrier transition to HIGH.
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*/
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if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) {
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/*
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* When carrier rises, wake any threads waiting
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* for carrier in the open routine.
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*/
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jsm_dbg(CARR, &ch->ch_bd->pci_dev,
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"carrier: physical DCD rose\n");
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if (waitqueue_active(&(ch->ch_flags_wait)))
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wake_up_interruptible(&ch->ch_flags_wait);
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}
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/*
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* Test for a PHYSICAL transition to low, so long as we aren't
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* currently ignoring physical transitions (which is what "virtual
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* carrier" indicates).
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*
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* The transition of the virtual carrier to low really doesn't
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* matter... it really only means "ignore carrier state", not
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* "make pretend that carrier is there".
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*/
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if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0)
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&& (phys_carrier == 0)) {
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/*
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* When carrier drops:
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*
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* Drop carrier on all open units.
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*
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* Flush queues, waking up any task waiting in the
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* line discipline.
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*
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* Send a hangup to the control terminal.
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*
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* Enable all select calls.
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*/
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if (waitqueue_active(&(ch->ch_flags_wait)))
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wake_up_interruptible(&ch->ch_flags_wait);
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}
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/*
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* Make sure that our cached values reflect the current reality.
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*/
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if (virt_carrier == 1)
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ch->ch_flags |= CH_FCAR;
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else
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ch->ch_flags &= ~CH_FCAR;
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if (phys_carrier == 1)
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ch->ch_flags |= CH_CD;
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else
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ch->ch_flags &= ~CH_CD;
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}
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void jsm_check_queue_flow_control(struct jsm_channel *ch)
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{
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struct board_ops *bd_ops = ch->ch_bd->bd_ops;
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int qleft;
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/* Store how much space we have left in the queue */
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if ((qleft = ch->ch_r_tail - ch->ch_r_head - 1) < 0)
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qleft += RQUEUEMASK + 1;
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/*
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* Check to see if we should enforce flow control on our queue because
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* the ld (or user) isn't reading data out of our queue fast enuf.
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*
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* NOTE: This is done based on what the current flow control of the
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* port is set for.
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*
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* 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt.
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* This will cause the UART's FIFO to back up, and force
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* the RTS signal to be dropped.
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* 2) SWFLOW (IXOFF) - Keep trying to send a stop character to
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* the other side, in hopes it will stop sending data to us.
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* 3) NONE - Nothing we can do. We will simply drop any extra data
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* that gets sent into us when the queue fills up.
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*/
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if (qleft < 256) {
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/* HWFLOW */
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if (ch->ch_c_cflag & CRTSCTS) {
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if (!(ch->ch_flags & CH_RECEIVER_OFF)) {
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bd_ops->disable_receiver(ch);
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ch->ch_flags |= (CH_RECEIVER_OFF);
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jsm_dbg(READ, &ch->ch_bd->pci_dev,
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"Internal queue hit hilevel mark (%d)! Turning off interrupts\n",
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qleft);
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}
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}
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/* SWFLOW */
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else if (ch->ch_c_iflag & IXOFF) {
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if (ch->ch_stops_sent <= MAX_STOPS_SENT) {
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bd_ops->send_stop_character(ch);
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ch->ch_stops_sent++;
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jsm_dbg(READ, &ch->ch_bd->pci_dev,
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"Sending stop char! Times sent: %x\n",
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ch->ch_stops_sent);
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}
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}
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}
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/*
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* Check to see if we should unenforce flow control because
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* ld (or user) finally read enuf data out of our queue.
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*
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* NOTE: This is done based on what the current flow control of the
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* port is set for.
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*
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* 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt.
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* This will cause the UART's FIFO to raise RTS back up,
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* which will allow the other side to start sending data again.
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* 2) SWFLOW (IXOFF) - Send a start character to
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* the other side, so it will start sending data to us again.
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* 3) NONE - Do nothing. Since we didn't do anything to turn off the
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* other side, we don't need to do anything now.
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*/
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if (qleft > (RQUEUESIZE / 2)) {
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/* HWFLOW */
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if (ch->ch_c_cflag & CRTSCTS) {
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if (ch->ch_flags & CH_RECEIVER_OFF) {
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bd_ops->enable_receiver(ch);
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ch->ch_flags &= ~(CH_RECEIVER_OFF);
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jsm_dbg(READ, &ch->ch_bd->pci_dev,
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"Internal queue hit lowlevel mark (%d)! Turning on interrupts\n",
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qleft);
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}
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}
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/* SWFLOW */
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else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) {
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ch->ch_stops_sent = 0;
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bd_ops->send_start_character(ch);
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jsm_dbg(READ, &ch->ch_bd->pci_dev,
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"Sending start char!\n");
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}
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}
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}
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