diff options
Diffstat (limited to 'drivers/serial/jsm/jsm_tty.c')
| -rw-r--r-- | drivers/serial/jsm/jsm_tty.c | 1038 |
1 files changed, 1038 insertions, 0 deletions
diff --git a/drivers/serial/jsm/jsm_tty.c b/drivers/serial/jsm/jsm_tty.c new file mode 100644 index 0000000..7fb7cc0 --- /dev/null +++ b/drivers/serial/jsm/jsm_tty.c @@ -0,0 +1,1038 @@ +/************************************************************************ + * Copyright 2003 Digi International (www.digi.com) + * + * Copyright (C) 2004 IBM Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the + * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR + * PURPOSE. See the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 * Temple Place - Suite 330, Boston, + * MA 02111-1307, USA. + * + * Contact Information: + * Scott H Kilau <Scott_Kilau@digi.com> + * Wendy Xiong <wendyx@us.ltcfwd.linux.ibm.com> + * + ***********************************************************************/ +#include <linux/tty.h> +#include <linux/tty_flip.h> +#include <linux/serial_reg.h> +#include <linux/delay.h> /* For udelay */ +#include <linux/pci.h> + +#include "jsm.h" + +static inline int jsm_get_mstat(struct jsm_channel *ch) +{ + unsigned char mstat; + unsigned result; + + jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "start\n"); + + mstat = (ch->ch_mostat | ch->ch_mistat); + + result = 0; + + if (mstat & UART_MCR_DTR) + result |= TIOCM_DTR; + if (mstat & UART_MCR_RTS) + result |= TIOCM_RTS; + if (mstat & UART_MSR_CTS) + result |= TIOCM_CTS; + if (mstat & UART_MSR_DSR) + result |= TIOCM_DSR; + if (mstat & UART_MSR_RI) + result |= TIOCM_RI; + if (mstat & UART_MSR_DCD) + result |= TIOCM_CD; + + jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n"); + return result; +} + +static unsigned int jsm_tty_tx_empty(struct uart_port *port) +{ + return TIOCSER_TEMT; +} + +/* + * Return modem signals to ld. + */ +static unsigned int jsm_tty_get_mctrl(struct uart_port *port) +{ + int result; + struct jsm_channel *channel = (struct jsm_channel *)port; + + jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); + + result = jsm_get_mstat(channel); + + if (result < 0) + return -ENXIO; + + jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); + + return result; +} + +/* + * jsm_set_modem_info() + * + * Set modem signals, called by ld. + */ +static void jsm_tty_set_mctrl(struct uart_port *port, unsigned int mctrl) +{ + struct jsm_channel *channel = (struct jsm_channel *)port; + + jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); + + if (mctrl & TIOCM_RTS) + channel->ch_mostat |= UART_MCR_RTS; + else + channel->ch_mostat &= ~UART_MCR_RTS; + + if (mctrl & TIOCM_DTR) + channel->ch_mostat |= UART_MCR_DTR; + else + channel->ch_mostat &= ~UART_MCR_DTR; + + channel->ch_bd->bd_ops->assert_modem_signals(channel); + + jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); + udelay(10); +} + +static void jsm_tty_start_tx(struct uart_port *port, unsigned int tty_start) +{ + struct jsm_channel *channel = (struct jsm_channel *)port; + + jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); + + channel->ch_flags &= ~(CH_STOP); + jsm_tty_write(port); + + jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); +} + +static void jsm_tty_stop_tx(struct uart_port *port, unsigned int tty_stop) +{ + struct jsm_channel *channel = (struct jsm_channel *)port; + + jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); + + channel->ch_flags |= (CH_STOP); + + jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); +} + +static void jsm_tty_send_xchar(struct uart_port *port, char ch) +{ + unsigned long lock_flags; + struct jsm_channel *channel = (struct jsm_channel *)port; + + spin_lock_irqsave(&port->lock, lock_flags); + if (ch == port->info->tty->termios->c_cc[VSTART]) + channel->ch_bd->bd_ops->send_start_character(channel); + + if (ch == port->info->tty->termios->c_cc[VSTOP]) + channel->ch_bd->bd_ops->send_stop_character(channel); + spin_unlock_irqrestore(&port->lock, lock_flags); +} + +static void jsm_tty_stop_rx(struct uart_port *port) +{ + struct jsm_channel *channel = (struct jsm_channel *)port; + + channel->ch_bd->bd_ops->disable_receiver(channel); +} + +static void jsm_tty_break(struct uart_port *port, int break_state) +{ + unsigned long lock_flags; + struct jsm_channel *channel = (struct jsm_channel *)port; + + spin_lock_irqsave(&port->lock, lock_flags); + if (break_state == -1) + channel->ch_bd->bd_ops->send_break(channel); + else + channel->ch_bd->bd_ops->clear_break(channel, 0); + + spin_unlock_irqrestore(&port->lock, lock_flags); +} + +static int jsm_tty_open(struct uart_port *port) +{ + struct jsm_board *brd; + int rc = 0; + struct jsm_channel *channel = (struct jsm_channel *)port; + + /* Get board pointer from our array of majors we have allocated */ + brd = channel->ch_bd; + + /* + * Allocate channel buffers for read/write/error. + * Set flag, so we don't get trounced on. + */ + channel->ch_flags |= (CH_OPENING); + + /* Drop locks, as malloc with GFP_KERNEL can sleep */ + + if (!channel->ch_rqueue) { + channel->ch_rqueue = (u8 *) kmalloc(RQUEUESIZE, GFP_KERNEL); + if (!channel->ch_rqueue) { + jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, + "unable to allocate read queue buf"); + return -ENOMEM; + } + memset(channel->ch_rqueue, 0, RQUEUESIZE); + } + if (!channel->ch_equeue) { + channel->ch_equeue = (u8 *) kmalloc(EQUEUESIZE, GFP_KERNEL); + if (!channel->ch_equeue) { + jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, + "unable to allocate error queue buf"); + return -ENOMEM; + } + memset(channel->ch_equeue, 0, EQUEUESIZE); + } + if (!channel->ch_wqueue) { + channel->ch_wqueue = (u8 *) kmalloc(WQUEUESIZE, GFP_KERNEL); + if (!channel->ch_wqueue) { + jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, + "unable to allocate write queue buf"); + return -ENOMEM; + } + memset(channel->ch_wqueue, 0, WQUEUESIZE); + } + + channel->ch_flags &= ~(CH_OPENING); + /* + * Initialize if neither terminal is open. + */ + jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, + "jsm_open: initializing channel in open...\n"); + + /* + * Flush input queues. + */ + channel->ch_r_head = channel->ch_r_tail = 0; + channel->ch_e_head = channel->ch_e_tail = 0; + channel->ch_w_head = channel->ch_w_tail = 0; + + brd->bd_ops->flush_uart_write(channel); + brd->bd_ops->flush_uart_read(channel); + + channel->ch_flags = 0; + channel->ch_cached_lsr = 0; + channel->ch_stops_sent = 0; + + channel->ch_c_cflag = port->info->tty->termios->c_cflag; + channel->ch_c_iflag = port->info->tty->termios->c_iflag; + channel->ch_c_oflag = port->info->tty->termios->c_oflag; + channel->ch_c_lflag = port->info->tty->termios->c_lflag; + channel->ch_startc = port->info->tty->termios->c_cc[VSTART]; + channel->ch_stopc = port->info->tty->termios->c_cc[VSTOP]; + + /* Tell UART to init itself */ + brd->bd_ops->uart_init(channel); + + /* + * Run param in case we changed anything + */ + brd->bd_ops->param(channel); + + jsm_carrier(channel); + + channel->ch_open_count++; + + jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, "finish\n"); + return rc; +} + +static void jsm_tty_close(struct uart_port *port) +{ + struct jsm_board *bd; + struct termios *ts; + struct jsm_channel *channel = (struct jsm_channel *)port; + + jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "start\n"); + + bd = channel->ch_bd; + ts = channel->uart_port.info->tty->termios; + + channel->ch_flags &= ~(CH_STOPI); + + channel->ch_open_count--; + + /* + * If we have HUPCL set, lower DTR and RTS + */ + if (channel->ch_c_cflag & HUPCL) { + jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, + "Close. HUPCL set, dropping DTR/RTS\n"); + + /* Drop RTS/DTR */ + channel->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS); + bd->bd_ops->assert_modem_signals(channel); + } + + channel->ch_old_baud = 0; + + /* Turn off UART interrupts for this port */ + channel->ch_bd->bd_ops->uart_off(channel); + + jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "finish\n"); +} + +static void jsm_tty_set_termios(struct uart_port *port, + struct termios *termios, + struct termios *old_termios) +{ + unsigned long lock_flags; + struct jsm_channel *channel = (struct jsm_channel *)port; + + spin_lock_irqsave(&port->lock, lock_flags); + channel->ch_c_cflag = termios->c_cflag; + channel->ch_c_iflag = termios->c_iflag; + channel->ch_c_oflag = termios->c_oflag; + channel->ch_c_lflag = termios->c_lflag; + channel->ch_startc = termios->c_cc[VSTART]; + channel->ch_stopc = termios->c_cc[VSTOP]; + + channel->ch_bd->bd_ops->param(channel); + jsm_carrier(channel); + spin_unlock_irqrestore(&port->lock, lock_flags); +} + +static const char *jsm_tty_type(struct uart_port *port) +{ + return "jsm"; +} + +static void jsm_tty_release_port(struct uart_port *port) +{ +} + +static int jsm_tty_request_port(struct uart_port *port) +{ + return 0; +} + +static void jsm_config_port(struct uart_port *port, int flags) +{ + port->type = PORT_JSM; +} + +static struct uart_ops jsm_ops = { + .tx_empty = jsm_tty_tx_empty, + .set_mctrl = jsm_tty_set_mctrl, + .get_mctrl = jsm_tty_get_mctrl, + .stop_tx = jsm_tty_stop_tx, + .start_tx = jsm_tty_start_tx, + .send_xchar = jsm_tty_send_xchar, + .stop_rx = jsm_tty_stop_rx, + .break_ctl = jsm_tty_break, + .startup = jsm_tty_open, + .shutdown = jsm_tty_close, + .set_termios = jsm_tty_set_termios, + .type = jsm_tty_type, + .release_port = jsm_tty_release_port, + .request_port = jsm_tty_request_port, + .config_port = jsm_config_port, +}; + +/* + * jsm_tty_init() + * + * Init the tty subsystem. Called once per board after board has been + * downloaded and init'ed. + */ +int jsm_tty_init(struct jsm_board *brd) +{ + int i; + void __iomem *vaddr; + struct jsm_channel *ch; + + if (!brd) + return -ENXIO; + + jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); + + /* + * Initialize board structure elements. + */ + + brd->nasync = brd->maxports; + + /* + * Allocate channel memory that might not have been allocated + * when the driver was first loaded. + */ + for (i = 0; i < brd->nasync; i++) { + if (!brd->channels[i]) { + + /* + * Okay to malloc with GFP_KERNEL, we are not at + * interrupt context, and there are no locks held. + */ + brd->channels[i] = kmalloc(sizeof(struct jsm_channel), GFP_KERNEL); + if (!brd->channels[i]) { + jsm_printk(CORE, ERR, &brd->pci_dev, + "%s:%d Unable to allocate memory for channel struct\n", + __FILE__, __LINE__); + } + memset(brd->channels[i], 0, sizeof(struct jsm_channel)); + } + } + + ch = brd->channels[0]; + vaddr = brd->re_map_membase; + + /* Set up channel variables */ + for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { + + if (!brd->channels[i]) + continue; + + spin_lock_init(&ch->ch_lock); + + if (brd->bd_uart_offset == 0x200) + ch->ch_neo_uart = vaddr + (brd->bd_uart_offset * i); + + ch->ch_bd = brd; + ch->ch_portnum = i; + + /* .25 second delay */ + ch->ch_close_delay = 250; + + init_waitqueue_head(&ch->ch_flags_wait); + } + + jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); + return 0; +} + +int jsm_uart_port_init(struct jsm_board *brd) +{ + int i; + struct jsm_channel *ch; + + if (!brd) + return -ENXIO; + + jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); + + /* + * Initialize board structure elements. + */ + + brd->nasync = brd->maxports; + + /* Set up channel variables */ + for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { + + if (!brd->channels[i]) + continue; + + brd->channels[i]->uart_port.irq = brd->irq; + brd->channels[i]->uart_port.type = PORT_JSM; + brd->channels[i]->uart_port.iotype = UPIO_MEM; + brd->channels[i]->uart_port.membase = brd->re_map_membase; + brd->channels[i]->uart_port.fifosize = 16; + brd->channels[i]->uart_port.ops = &jsm_ops; + brd->channels[i]->uart_port.line = brd->channels[i]->ch_portnum + brd->boardnum * 2; + if (uart_add_one_port (&jsm_uart_driver, &brd->channels[i]->uart_port)) + printk(KERN_INFO "Added device failed\n"); + else + printk(KERN_INFO "Added device \n"); + } + + jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); + return 0; +} + +int jsm_remove_uart_port(struct jsm_board *brd) +{ + int i; + struct jsm_channel *ch; + + if (!brd) + return -ENXIO; + + jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); + + /* + * Initialize board structure elements. + */ + + brd->nasync = brd->maxports; + + /* Set up channel variables */ + for (i = 0; i < brd->nasync; i++) { + + if (!brd->channels[i]) + continue; + + ch = brd->channels[i]; + + uart_remove_one_port(&jsm_uart_driver, &brd->channels[i]->uart_port); + } + + jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); + return 0; +} + +void jsm_input(struct jsm_channel *ch) +{ + struct jsm_board *bd; + struct tty_struct *tp; + u32 rmask; + u16 head; + u16 tail; + int data_len; + unsigned long lock_flags; + int flip_len; + int len = 0; + int n = 0; + char *buf = NULL; + char *buf2 = NULL; + int s = 0; + int i = 0; + + 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"); +} + +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; +} + +static ssize_t jsm_driver_version_show(struct device_driver *ddp, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%s\n", JSM_VERSION); +} +static DRIVER_ATTR(version, S_IRUSR, jsm_driver_version_show, NULL); + +static ssize_t jsm_driver_state_show(struct device_driver *ddp, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%s\n", jsm_driver_state_text[jsm_driver_state]); +} +static DRIVER_ATTR(state, S_IRUSR, jsm_driver_state_show, NULL); + +void jsm_create_driver_sysfiles(struct device_driver *driverfs) +{ + driver_create_file(driverfs, &driver_attr_version); + driver_create_file(driverfs, &driver_attr_state); +} + +void jsm_remove_driver_sysfiles(struct device_driver *driverfs) +{ + driver_remove_file(driverfs, &driver_attr_version); + driver_remove_file(driverfs, &driver_attr_state); +} |
