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1016 lines
25 KiB
1016 lines
25 KiB
/************************************************************************
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 * Temple Place - Suite 330, Boston,
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* MA 02111-1307, USA.
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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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* Wendy Xiong <wendyx@us.ltcfwd.linux.ibm.com>
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*
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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 "jsm.h"
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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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unsigned result;
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jsm_printk(IOCTL, INFO, &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_printk(IOCTL, INFO, &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 = (struct jsm_channel *)port;
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jsm_printk(IOCTL, INFO, &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_printk(IOCTL, INFO, &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 = (struct jsm_channel *)port;
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jsm_printk(IOCTL, INFO, &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_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n");
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udelay(10);
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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 = (struct jsm_channel *)port;
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jsm_printk(IOCTL, INFO, &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_printk(IOCTL, INFO, &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 = (struct jsm_channel *)port;
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jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n");
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channel->ch_flags |= (CH_STOP);
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jsm_printk(IOCTL, INFO, &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 = (struct jsm_channel *)port;
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spin_lock_irqsave(&port->lock, lock_flags);
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if (ch == port->info->tty->termios->c_cc[VSTART])
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channel->ch_bd->bd_ops->send_start_character(channel);
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if (ch == port->info->tty->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 = (struct jsm_channel *)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 = (struct jsm_channel *)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, 0);
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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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struct jsm_board *brd;
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int rc = 0;
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struct jsm_channel *channel = (struct jsm_channel *)port;
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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 = (u8 *) kmalloc(RQUEUESIZE, GFP_KERNEL);
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if (!channel->ch_rqueue) {
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jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev,
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"unable to allocate read queue buf");
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return -ENOMEM;
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}
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memset(channel->ch_rqueue, 0, RQUEUESIZE);
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}
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if (!channel->ch_equeue) {
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channel->ch_equeue = (u8 *) kmalloc(EQUEUESIZE, GFP_KERNEL);
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if (!channel->ch_equeue) {
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jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev,
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"unable to allocate error queue buf");
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return -ENOMEM;
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}
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memset(channel->ch_equeue, 0, EQUEUESIZE);
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}
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if (!channel->ch_wqueue) {
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channel->ch_wqueue = (u8 *) kmalloc(WQUEUESIZE, GFP_KERNEL);
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if (!channel->ch_wqueue) {
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jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev,
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"unable to allocate write queue buf");
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return -ENOMEM;
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}
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memset(channel->ch_wqueue, 0, WQUEUESIZE);
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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_printk(OPEN, INFO, &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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channel->ch_w_head = channel->ch_w_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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channel->ch_c_cflag = port->info->tty->termios->c_cflag;
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channel->ch_c_iflag = port->info->tty->termios->c_iflag;
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channel->ch_c_oflag = port->info->tty->termios->c_oflag;
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channel->ch_c_lflag = port->info->tty->termios->c_lflag;
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channel->ch_startc = port->info->tty->termios->c_cc[VSTART];
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channel->ch_stopc = port->info->tty->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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jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, "finish\n");
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return rc;
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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 termios *ts;
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struct jsm_channel *channel = (struct jsm_channel *)port;
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jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "start\n");
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bd = channel->ch_bd;
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ts = channel->uart_port.info->tty->termios;
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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_printk(CLOSE, INFO, &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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channel->ch_old_baud = 0;
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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_printk(CLOSE, INFO, &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 termios *termios,
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struct termios *old_termios)
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{
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unsigned long lock_flags;
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struct jsm_channel *channel = (struct jsm_channel *)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 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_printk(INIT, INFO, &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] = kmalloc(sizeof(struct jsm_channel), GFP_KERNEL);
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if (!brd->channels[i]) {
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jsm_printk(CORE, ERR, &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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memset(brd->channels[i], 0, sizeof(struct jsm_channel));
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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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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_printk(INIT, INFO, &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;
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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_printk(INIT, INFO, &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++, ch = brd->channels[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.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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brd->channels[i]->uart_port.line = brd->channels[i]->ch_portnum + brd->boardnum * 2;
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if (uart_add_one_port (&jsm_uart_driver, &brd->channels[i]->uart_port))
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printk(KERN_INFO "Added device failed\n");
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else
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printk(KERN_INFO "Added device \n");
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}
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jsm_printk(INIT, INFO, &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_printk(INIT, INFO, &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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uart_remove_one_port(&jsm_uart_driver, &brd->channels[i]->uart_port);
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}
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jsm_printk(INIT, INFO, &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;
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u32 rmask;
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u16 head;
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u16 tail;
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int data_len;
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unsigned long lock_flags;
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int flip_len;
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int len = 0;
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int n = 0;
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char *buf = NULL;
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char *buf2 = NULL;
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int s = 0;
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int i = 0;
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|
|
|
jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n");
|
|
|
|
if (!ch)
|
|
return;
|
|
|
|
tp = ch->uart_port.info->tty;
|
|
|
|
bd = ch->ch_bd;
|
|
if(!bd)
|
|
return;
|
|
|
|
spin_lock_irqsave(&ch->ch_lock, lock_flags);
|
|
|
|
/*
|
|
*Figure the number of characters in the buffer.
|
|
*Exit immediately if none.
|
|
*/
|
|
|
|
rmask = RQUEUEMASK;
|
|
|
|
head = ch->ch_r_head & rmask;
|
|
tail = ch->ch_r_tail & rmask;
|
|
|
|
data_len = (head - tail) & rmask;
|
|
if (data_len == 0) {
|
|
spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
|
|
return;
|
|
}
|
|
|
|
jsm_printk(READ, INFO, &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 ||
|
|
!(tp->termios->c_cflag & CREAD) ) {
|
|
|
|
jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
|
|
"input. dropping %d bytes on port %d...\n", 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_printk(READ, INFO, &ch->ch_bd->pci_dev,
|
|
"Port %d throttled, not reading any data. head: %x tail: %x\n",
|
|
ch->ch_portnum, head, tail);
|
|
return;
|
|
}
|
|
|
|
jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start 2\n");
|
|
|
|
/*
|
|
* If the rxbuf is empty and we are not throttled, put as much
|
|
* as we can directly into the linux TTY flip buffer.
|
|
* The jsm_rawreadok case takes advantage of carnal knowledge that
|
|
* the char_buf and the flag_buf are next to each other and
|
|
* are each of (2 * TTY_FLIPBUF_SIZE) size.
|
|
*
|
|
* NOTE: if(!tty->real_raw), the call to ldisc.receive_buf
|
|
*actually still uses the flag buffer, so you can't
|
|
*use it for input data
|
|
*/
|
|
if (jsm_rawreadok) {
|
|
if (tp->real_raw)
|
|
flip_len = MYFLIPLEN;
|
|
else
|
|
flip_len = 2 * TTY_FLIPBUF_SIZE;
|
|
} else
|
|
flip_len = TTY_FLIPBUF_SIZE - tp->flip.count;
|
|
|
|
len = min(data_len, flip_len);
|
|
len = min(len, (N_TTY_BUF_SIZE - 1) - tp->read_cnt);
|
|
|
|
if (len <= 0) {
|
|
spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
|
|
jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "jsm_input 1\n");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* If we're bypassing flip buffers on rx, we can blast it
|
|
* right into the beginning of the buffer.
|
|
*/
|
|
if (jsm_rawreadok) {
|
|
if (tp->real_raw) {
|
|
if (ch->ch_flags & CH_FLIPBUF_IN_USE) {
|
|
jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
|
|
"JSM - FLIPBUF in use. delaying input\n");
|
|
spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
|
|
return;
|
|
}
|
|
ch->ch_flags |= CH_FLIPBUF_IN_USE;
|
|
buf = ch->ch_bd->flipbuf;
|
|
buf2 = NULL;
|
|
} else {
|
|
buf = tp->flip.char_buf;
|
|
buf2 = tp->flip.flag_buf;
|
|
}
|
|
} else {
|
|
buf = tp->flip.char_buf_ptr;
|
|
buf2 = tp->flip.flag_buf_ptr;
|
|
}
|
|
|
|
n = len;
|
|
|
|
/*
|
|
* n 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 (n) {
|
|
s = ((head >= tail) ? head : RQUEUESIZE) - tail;
|
|
s = min(s, n);
|
|
|
|
if (s <= 0)
|
|
break;
|
|
|
|
memcpy(buf, ch->ch_rqueue + tail, s);
|
|
|
|
/* buf2 is only set when port isn't raw */
|
|
if (buf2)
|
|
memcpy(buf2, ch->ch_equeue + tail, s);
|
|
|
|
tail += s;
|
|
buf += s;
|
|
if (buf2)
|
|
buf2 += s;
|
|
n -= s;
|
|
/* Flip queue if needed */
|
|
tail &= rmask;
|
|
}
|
|
|
|
/*
|
|
* In high performance mode, we don't have to update
|
|
* flag_buf or any of the counts or pointers into flip buf.
|
|
*/
|
|
if (!jsm_rawreadok) {
|
|
if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) {
|
|
for (i = 0; i < len; i++) {
|
|
/*
|
|
* Give the Linux ld the flags in the
|
|
* format it likes.
|
|
*/
|
|
if (tp->flip.flag_buf_ptr[i] & UART_LSR_BI)
|
|
tp->flip.flag_buf_ptr[i] = TTY_BREAK;
|
|
else if (tp->flip.flag_buf_ptr[i] & UART_LSR_PE)
|
|
tp->flip.flag_buf_ptr[i] = TTY_PARITY;
|
|
else if (tp->flip.flag_buf_ptr[i] & UART_LSR_FE)
|
|
tp->flip.flag_buf_ptr[i] = TTY_FRAME;
|
|
else
|
|
tp->flip.flag_buf_ptr[i] = TTY_NORMAL;
|
|
}
|
|
} else {
|
|
memset(tp->flip.flag_buf_ptr, 0, len);
|
|
}
|
|
|
|
tp->flip.char_buf_ptr += len;
|
|
tp->flip.flag_buf_ptr += len;
|
|
tp->flip.count += len;
|
|
}
|
|
else if (!tp->real_raw) {
|
|
if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) {
|
|
for (i = 0; i < len; i++) {
|
|
/*
|
|
* Give the Linux ld the flags in the
|
|
* format it likes.
|
|
*/
|
|
if (tp->flip.flag_buf_ptr[i] & UART_LSR_BI)
|
|
tp->flip.flag_buf_ptr[i] = TTY_BREAK;
|
|
else if (tp->flip.flag_buf_ptr[i] & UART_LSR_PE)
|
|
tp->flip.flag_buf_ptr[i] = TTY_PARITY;
|
|
else if (tp->flip.flag_buf_ptr[i] & UART_LSR_FE)
|
|
tp->flip.flag_buf_ptr[i] = TTY_FRAME;
|
|
else
|
|
tp->flip.flag_buf_ptr[i] = TTY_NORMAL;
|
|
}
|
|
} else
|
|
memset(tp->flip.flag_buf, 0, len);
|
|
}
|
|
|
|
/*
|
|
* If we're doing raw reads, jam it right into the
|
|
* line disc bypassing the flip buffers.
|
|
*/
|
|
if (jsm_rawreadok) {
|
|
if (tp->real_raw) {
|
|
ch->ch_r_tail = tail & rmask;
|
|
ch->ch_e_tail = tail & rmask;
|
|
|
|
jsm_check_queue_flow_control(ch);
|
|
|
|
/* !!! WE *MUST* LET GO OF ALL LOCKS BEFORE CALLING RECEIVE BUF !!! */
|
|
|
|
spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
|
|
|
|
jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
|
|
"jsm_input. %d real_raw len:%d calling receive_buf for board %d\n",
|
|
__LINE__, len, ch->ch_bd->boardnum);
|
|
tp->ldisc.receive_buf(tp, ch->ch_bd->flipbuf, NULL, len);
|
|
|
|
/* Allow use of channel flip buffer again */
|
|
spin_lock_irqsave(&ch->ch_lock, lock_flags);
|
|
ch->ch_flags &= ~CH_FLIPBUF_IN_USE;
|
|
spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
|
|
|
|
} else {
|
|
ch->ch_r_tail = tail & rmask;
|
|
ch->ch_e_tail = tail & rmask;
|
|
|
|
jsm_check_queue_flow_control(ch);
|
|
|
|
/* !!! WE *MUST* LET GO OF ALL LOCKS BEFORE CALLING RECEIVE BUF !!! */
|
|
spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
|
|
|
|
jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
|
|
"jsm_input. %d not real_raw len:%d calling receive_buf for board %d\n",
|
|
__LINE__, len, ch->ch_bd->boardnum);
|
|
|
|
tp->ldisc.receive_buf(tp, tp->flip.char_buf, tp->flip.flag_buf, len);
|
|
}
|
|
} else {
|
|
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);
|
|
|
|
jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
|
|
"jsm_input. %d not jsm_read raw okay scheduling flip\n", __LINE__);
|
|
tty_schedule_flip(tp);
|
|
}
|
|
|
|
jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n");
|
|
}
|
|
|
|
static void jsm_carrier(struct jsm_channel *ch)
|
|
{
|
|
struct jsm_board *bd;
|
|
|
|
int virt_carrier = 0;
|
|
int phys_carrier = 0;
|
|
|
|
jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, "start\n");
|
|
if (!ch)
|
|
return;
|
|
|
|
bd = ch->ch_bd;
|
|
|
|
if (!bd)
|
|
return;
|
|
|
|
if (ch->ch_mistat & UART_MSR_DCD) {
|
|
jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev,
|
|
"mistat: %x D_CD: %x\n", ch->ch_mistat, ch->ch_mistat & UART_MSR_DCD);
|
|
phys_carrier = 1;
|
|
}
|
|
|
|
if (ch->ch_c_cflag & CLOCAL)
|
|
virt_carrier = 1;
|
|
|
|
jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev,
|
|
"DCD: physical: %d virt: %d\n", phys_carrier, virt_carrier);
|
|
|
|
/*
|
|
* Test for a VIRTUAL carrier transition to HIGH.
|
|
*/
|
|
if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) {
|
|
|
|
/*
|
|
* When carrier rises, wake any threads waiting
|
|
* for carrier in the open routine.
|
|
*/
|
|
|
|
jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev,
|
|
"carrier: virt DCD rose\n");
|
|
|
|
if (waitqueue_active(&(ch->ch_flags_wait)))
|
|
wake_up_interruptible(&ch->ch_flags_wait);
|
|
}
|
|
|
|
/*
|
|
* Test for a PHYSICAL carrier transition to HIGH.
|
|
*/
|
|
if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) {
|
|
|
|
/*
|
|
* When carrier rises, wake any threads waiting
|
|
* for carrier in the open routine.
|
|
*/
|
|
|
|
jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev,
|
|
"carrier: physical DCD rose\n");
|
|
|
|
if (waitqueue_active(&(ch->ch_flags_wait)))
|
|
wake_up_interruptible(&ch->ch_flags_wait);
|
|
}
|
|
|
|
/*
|
|
* Test for a PHYSICAL transition to low, so long as we aren't
|
|
* currently ignoring physical transitions (which is what "virtual
|
|
* carrier" indicates).
|
|
*
|
|
* The transition of the virtual carrier to low really doesn't
|
|
* matter... it really only means "ignore carrier state", not
|
|
* "make pretend that carrier is there".
|
|
*/
|
|
if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0)
|
|
&& (phys_carrier == 0)) {
|
|
/*
|
|
* When carrier drops:
|
|
*
|
|
* Drop carrier on all open units.
|
|
*
|
|
* Flush queues, waking up any task waiting in the
|
|
* line discipline.
|
|
*
|
|
* Send a hangup to the control terminal.
|
|
*
|
|
* Enable all select calls.
|
|
*/
|
|
if (waitqueue_active(&(ch->ch_flags_wait)))
|
|
wake_up_interruptible(&ch->ch_flags_wait);
|
|
}
|
|
|
|
/*
|
|
* Make sure that our cached values reflect the current reality.
|
|
*/
|
|
if (virt_carrier == 1)
|
|
ch->ch_flags |= CH_FCAR;
|
|
else
|
|
ch->ch_flags &= ~CH_FCAR;
|
|
|
|
if (phys_carrier == 1)
|
|
ch->ch_flags |= CH_CD;
|
|
else
|
|
ch->ch_flags &= ~CH_CD;
|
|
}
|
|
|
|
|
|
void jsm_check_queue_flow_control(struct jsm_channel *ch)
|
|
{
|
|
int qleft = 0;
|
|
|
|
/* Store how much space we have left in the queue */
|
|
if ((qleft = ch->ch_r_tail - ch->ch_r_head - 1) < 0)
|
|
qleft += RQUEUEMASK + 1;
|
|
|
|
/*
|
|
* Check to see if we should enforce flow control on our queue because
|
|
* the ld (or user) isn't reading data out of our queue fast enuf.
|
|
*
|
|
* NOTE: This is done based on what the current flow control of the
|
|
* port is set for.
|
|
*
|
|
* 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt.
|
|
* This will cause the UART's FIFO to back up, and force
|
|
* the RTS signal to be dropped.
|
|
* 2) SWFLOW (IXOFF) - Keep trying to send a stop character to
|
|
* the other side, in hopes it will stop sending data to us.
|
|
* 3) NONE - Nothing we can do. We will simply drop any extra data
|
|
* that gets sent into us when the queue fills up.
|
|
*/
|
|
if (qleft < 256) {
|
|
/* HWFLOW */
|
|
if (ch->ch_c_cflag & CRTSCTS) {
|
|
if(!(ch->ch_flags & CH_RECEIVER_OFF)) {
|
|
ch->ch_bd->bd_ops->disable_receiver(ch);
|
|
ch->ch_flags |= (CH_RECEIVER_OFF);
|
|
jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
|
|
"Internal queue hit hilevel mark (%d)! Turning off interrupts.\n",
|
|
qleft);
|
|
}
|
|
}
|
|
/* SWFLOW */
|
|
else if (ch->ch_c_iflag & IXOFF) {
|
|
if (ch->ch_stops_sent <= MAX_STOPS_SENT) {
|
|
ch->ch_bd->bd_ops->send_stop_character(ch);
|
|
ch->ch_stops_sent++;
|
|
jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
|
|
"Sending stop char! Times sent: %x\n", ch->ch_stops_sent);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check to see if we should unenforce flow control because
|
|
* ld (or user) finally read enuf data out of our queue.
|
|
*
|
|
* NOTE: This is done based on what the current flow control of the
|
|
* port is set for.
|
|
*
|
|
* 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt.
|
|
* This will cause the UART's FIFO to raise RTS back up,
|
|
* which will allow the other side to start sending data again.
|
|
* 2) SWFLOW (IXOFF) - Send a start character to
|
|
* the other side, so it will start sending data to us again.
|
|
* 3) NONE - Do nothing. Since we didn't do anything to turn off the
|
|
* other side, we don't need to do anything now.
|
|
*/
|
|
if (qleft > (RQUEUESIZE / 2)) {
|
|
/* HWFLOW */
|
|
if (ch->ch_c_cflag & CRTSCTS) {
|
|
if (ch->ch_flags & CH_RECEIVER_OFF) {
|
|
ch->ch_bd->bd_ops->enable_receiver(ch);
|
|
ch->ch_flags &= ~(CH_RECEIVER_OFF);
|
|
jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
|
|
"Internal queue hit lowlevel mark (%d)! Turning on interrupts.\n",
|
|
qleft);
|
|
}
|
|
}
|
|
/* SWFLOW */
|
|
else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) {
|
|
ch->ch_stops_sent = 0;
|
|
ch->ch_bd->bd_ops->send_start_character(ch);
|
|
jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "Sending start char!\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* jsm_tty_write()
|
|
*
|
|
* Take data from the user or kernel and send it out to the FEP.
|
|
* In here exists all the Transparent Print magic as well.
|
|
*/
|
|
int jsm_tty_write(struct uart_port *port)
|
|
{
|
|
int bufcount = 0, n = 0;
|
|
int data_count = 0,data_count1 =0;
|
|
u16 head;
|
|
u16 tail;
|
|
u16 tmask;
|
|
u32 remain;
|
|
int temp_tail = port->info->xmit.tail;
|
|
struct jsm_channel *channel = (struct jsm_channel *)port;
|
|
|
|
tmask = WQUEUEMASK;
|
|
head = (channel->ch_w_head) & tmask;
|
|
tail = (channel->ch_w_tail) & tmask;
|
|
|
|
if ((bufcount = tail - head - 1) < 0)
|
|
bufcount += WQUEUESIZE;
|
|
|
|
n = bufcount;
|
|
|
|
n = min(n, 56);
|
|
remain = WQUEUESIZE - head;
|
|
|
|
data_count = 0;
|
|
if (n >= remain) {
|
|
n -= remain;
|
|
while ((port->info->xmit.head != temp_tail) &&
|
|
(data_count < remain)) {
|
|
channel->ch_wqueue[head++] =
|
|
port->info->xmit.buf[temp_tail];
|
|
|
|
temp_tail++;
|
|
temp_tail &= (UART_XMIT_SIZE - 1);
|
|
data_count++;
|
|
}
|
|
if (data_count == remain) head = 0;
|
|
}
|
|
|
|
data_count1 = 0;
|
|
if (n > 0) {
|
|
remain = n;
|
|
while ((port->info->xmit.head != temp_tail) &&
|
|
(data_count1 < remain)) {
|
|
channel->ch_wqueue[head++] =
|
|
port->info->xmit.buf[temp_tail];
|
|
|
|
temp_tail++;
|
|
temp_tail &= (UART_XMIT_SIZE - 1);
|
|
data_count1++;
|
|
|
|
}
|
|
}
|
|
|
|
port->info->xmit.tail = temp_tail;
|
|
|
|
data_count += data_count1;
|
|
if (data_count) {
|
|
head &= tmask;
|
|
channel->ch_w_head = head;
|
|
}
|
|
|
|
if (data_count) {
|
|
channel->ch_bd->bd_ops->copy_data_from_queue_to_uart(channel);
|
|
}
|
|
|
|
return data_count;
|
|
}
|
|
|