blob: d1fceabe3aefcd5b54d8b071626a057b87564f8b [file] [log] [blame]
/*
* linux/drivers/char/pcmcia/synclink_cs.c
*
* $Id: synclink_cs.c,v 4.34 2005/09/08 13:20:54 paulkf Exp $
*
* Device driver for Microgate SyncLink PC Card
* multiprotocol serial adapter.
*
* written by Paul Fulghum for Microgate Corporation
* paulkf@microgate.com
*
* Microgate and SyncLink are trademarks of Microgate Corporation
*
* This code is released under the GNU General Public License (GPL)
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
#if defined(__i386__)
# define BREAKPOINT() asm(" int $3");
#else
# define BREAKPOINT() { }
#endif
#define MAX_DEVICE_COUNT 4
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/time.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/vmalloc.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/ioctl.h>
#include <linux/synclink.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/dma.h>
#include <linux/bitops.h>
#include <asm/types.h>
#include <linux/termios.h>
#include <linux/workqueue.h>
#include <linux/hdlc.h>
#include <pcmcia/cs_types.h>
#include <pcmcia/cs.h>
#include <pcmcia/cistpl.h>
#include <pcmcia/cisreg.h>
#include <pcmcia/ds.h>
#if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_CS_MODULE))
#define SYNCLINK_GENERIC_HDLC 1
#else
#define SYNCLINK_GENERIC_HDLC 0
#endif
#define GET_USER(error,value,addr) error = get_user(value,addr)
#define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
#define PUT_USER(error,value,addr) error = put_user(value,addr)
#define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
#include <asm/uaccess.h>
static MGSL_PARAMS default_params = {
MGSL_MODE_HDLC, /* unsigned long mode */
0, /* unsigned char loopback; */
HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */
HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */
0, /* unsigned long clock_speed; */
0xff, /* unsigned char addr_filter; */
HDLC_CRC_16_CCITT, /* unsigned short crc_type; */
HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */
HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */
9600, /* unsigned long data_rate; */
8, /* unsigned char data_bits; */
1, /* unsigned char stop_bits; */
ASYNC_PARITY_NONE /* unsigned char parity; */
};
typedef struct
{
int count;
unsigned char status;
char data[1];
} RXBUF;
/* The queue of BH actions to be performed */
#define BH_RECEIVE 1
#define BH_TRANSMIT 2
#define BH_STATUS 4
#define IO_PIN_SHUTDOWN_LIMIT 100
#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
struct _input_signal_events {
int ri_up;
int ri_down;
int dsr_up;
int dsr_down;
int dcd_up;
int dcd_down;
int cts_up;
int cts_down;
};
/*
* Device instance data structure
*/
typedef struct _mgslpc_info {
void *if_ptr; /* General purpose pointer (used by SPPP) */
int magic;
int flags;
int count; /* count of opens */
int line;
unsigned short close_delay;
unsigned short closing_wait; /* time to wait before closing */
struct mgsl_icount icount;
struct tty_struct *tty;
int timeout;
int x_char; /* xon/xoff character */
int blocked_open; /* # of blocked opens */
unsigned char read_status_mask;
unsigned char ignore_status_mask;
unsigned char *tx_buf;
int tx_put;
int tx_get;
int tx_count;
/* circular list of fixed length rx buffers */
unsigned char *rx_buf; /* memory allocated for all rx buffers */
int rx_buf_total_size; /* size of memory allocated for rx buffers */
int rx_put; /* index of next empty rx buffer */
int rx_get; /* index of next full rx buffer */
int rx_buf_size; /* size in bytes of single rx buffer */
int rx_buf_count; /* total number of rx buffers */
int rx_frame_count; /* number of full rx buffers */
wait_queue_head_t open_wait;
wait_queue_head_t close_wait;
wait_queue_head_t status_event_wait_q;
wait_queue_head_t event_wait_q;
struct timer_list tx_timer; /* HDLC transmit timeout timer */
struct _mgslpc_info *next_device; /* device list link */
unsigned short imra_value;
unsigned short imrb_value;
unsigned char pim_value;
spinlock_t lock;
struct work_struct task; /* task structure for scheduling bh */
u32 max_frame_size;
u32 pending_bh;
bool bh_running;
bool bh_requested;
int dcd_chkcount; /* check counts to prevent */
int cts_chkcount; /* too many IRQs if a signal */
int dsr_chkcount; /* is floating */
int ri_chkcount;
bool rx_enabled;
bool rx_overflow;
bool tx_enabled;
bool tx_active;
bool tx_aborting;
u32 idle_mode;
int if_mode; /* serial interface selection (RS-232, v.35 etc) */
char device_name[25]; /* device instance name */
unsigned int io_base; /* base I/O address of adapter */
unsigned int irq_level;
MGSL_PARAMS params; /* communications parameters */
unsigned char serial_signals; /* current serial signal states */
bool irq_occurred; /* for diagnostics use */
char testing_irq;
unsigned int init_error; /* startup error (DIAGS) */
char flag_buf[MAX_ASYNC_BUFFER_SIZE];
bool drop_rts_on_tx_done;
struct _input_signal_events input_signal_events;
/* PCMCIA support */
struct pcmcia_device *p_dev;
dev_node_t node;
int stop;
/* SPPP/Cisco HDLC device parts */
int netcount;
int dosyncppp;
spinlock_t netlock;
#if SYNCLINK_GENERIC_HDLC
struct net_device *netdev;
#endif
} MGSLPC_INFO;
#define MGSLPC_MAGIC 0x5402
/*
* The size of the serial xmit buffer is 1 page, or 4096 bytes
*/
#define TXBUFSIZE 4096
#define CHA 0x00 /* channel A offset */
#define CHB 0x40 /* channel B offset */
/*
* FIXME: PPC has PVR defined in asm/reg.h. For now we just undef it.
*/
#undef PVR
#define RXFIFO 0
#define TXFIFO 0
#define STAR 0x20
#define CMDR 0x20
#define RSTA 0x21
#define PRE 0x21
#define MODE 0x22
#define TIMR 0x23
#define XAD1 0x24
#define XAD2 0x25
#define RAH1 0x26
#define RAH2 0x27
#define DAFO 0x27
#define RAL1 0x28
#define RFC 0x28
#define RHCR 0x29
#define RAL2 0x29
#define RBCL 0x2a
#define XBCL 0x2a
#define RBCH 0x2b
#define XBCH 0x2b
#define CCR0 0x2c
#define CCR1 0x2d
#define CCR2 0x2e
#define CCR3 0x2f
#define VSTR 0x34
#define BGR 0x34
#define RLCR 0x35
#define AML 0x36
#define AMH 0x37
#define GIS 0x38
#define IVA 0x38
#define IPC 0x39
#define ISR 0x3a
#define IMR 0x3a
#define PVR 0x3c
#define PIS 0x3d
#define PIM 0x3d
#define PCR 0x3e
#define CCR4 0x3f
// IMR/ISR
#define IRQ_BREAK_ON BIT15 // rx break detected
#define IRQ_DATAOVERRUN BIT14 // receive data overflow
#define IRQ_ALLSENT BIT13 // all sent
#define IRQ_UNDERRUN BIT12 // transmit data underrun
#define IRQ_TIMER BIT11 // timer interrupt
#define IRQ_CTS BIT10 // CTS status change
#define IRQ_TXREPEAT BIT9 // tx message repeat
#define IRQ_TXFIFO BIT8 // transmit pool ready
#define IRQ_RXEOM BIT7 // receive message end
#define IRQ_EXITHUNT BIT6 // receive frame start
#define IRQ_RXTIME BIT6 // rx char timeout
#define IRQ_DCD BIT2 // carrier detect status change
#define IRQ_OVERRUN BIT1 // receive frame overflow
#define IRQ_RXFIFO BIT0 // receive pool full
// STAR
#define XFW BIT6 // transmit FIFO write enable
#define CEC BIT2 // command executing
#define CTS BIT1 // CTS state
#define PVR_DTR BIT0
#define PVR_DSR BIT1
#define PVR_RI BIT2
#define PVR_AUTOCTS BIT3
#define PVR_RS232 0x20 /* 0010b */
#define PVR_V35 0xe0 /* 1110b */
#define PVR_RS422 0x40 /* 0100b */
/* Register access functions */
#define write_reg(info, reg, val) outb((val),(info)->io_base + (reg))
#define read_reg(info, reg) inb((info)->io_base + (reg))
#define read_reg16(info, reg) inw((info)->io_base + (reg))
#define write_reg16(info, reg, val) outw((val), (info)->io_base + (reg))
#define set_reg_bits(info, reg, mask) \
write_reg(info, (reg), \
(unsigned char) (read_reg(info, (reg)) | (mask)))
#define clear_reg_bits(info, reg, mask) \
write_reg(info, (reg), \
(unsigned char) (read_reg(info, (reg)) & ~(mask)))
/*
* interrupt enable/disable routines
*/
static void irq_disable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
{
if (channel == CHA) {
info->imra_value |= mask;
write_reg16(info, CHA + IMR, info->imra_value);
} else {
info->imrb_value |= mask;
write_reg16(info, CHB + IMR, info->imrb_value);
}
}
static void irq_enable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
{
if (channel == CHA) {
info->imra_value &= ~mask;
write_reg16(info, CHA + IMR, info->imra_value);
} else {
info->imrb_value &= ~mask;
write_reg16(info, CHB + IMR, info->imrb_value);
}
}
#define port_irq_disable(info, mask) \
{ info->pim_value |= (mask); write_reg(info, PIM, info->pim_value); }
#define port_irq_enable(info, mask) \
{ info->pim_value &= ~(mask); write_reg(info, PIM, info->pim_value); }
static void rx_start(MGSLPC_INFO *info);
static void rx_stop(MGSLPC_INFO *info);
static void tx_start(MGSLPC_INFO *info);
static void tx_stop(MGSLPC_INFO *info);
static void tx_set_idle(MGSLPC_INFO *info);
static void get_signals(MGSLPC_INFO *info);
static void set_signals(MGSLPC_INFO *info);
static void reset_device(MGSLPC_INFO *info);
static void hdlc_mode(MGSLPC_INFO *info);
static void async_mode(MGSLPC_INFO *info);
static void tx_timeout(unsigned long context);
static int ioctl_common(MGSLPC_INFO *info, unsigned int cmd, unsigned long arg);
#if SYNCLINK_GENERIC_HDLC
#define dev_to_port(D) (dev_to_hdlc(D)->priv)
static void hdlcdev_tx_done(MGSLPC_INFO *info);
static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size);
static int hdlcdev_init(MGSLPC_INFO *info);
static void hdlcdev_exit(MGSLPC_INFO *info);
#endif
static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit);
static bool register_test(MGSLPC_INFO *info);
static bool irq_test(MGSLPC_INFO *info);
static int adapter_test(MGSLPC_INFO *info);
static int claim_resources(MGSLPC_INFO *info);
static void release_resources(MGSLPC_INFO *info);
static void mgslpc_add_device(MGSLPC_INFO *info);
static void mgslpc_remove_device(MGSLPC_INFO *info);
static bool rx_get_frame(MGSLPC_INFO *info);
static void rx_reset_buffers(MGSLPC_INFO *info);
static int rx_alloc_buffers(MGSLPC_INFO *info);
static void rx_free_buffers(MGSLPC_INFO *info);
static irqreturn_t mgslpc_isr(int irq, void *dev_id);
/*
* Bottom half interrupt handlers
*/
static void bh_handler(struct work_struct *work);
static void bh_transmit(MGSLPC_INFO *info);
static void bh_status(MGSLPC_INFO *info);
/*
* ioctl handlers
*/
static int tiocmget(struct tty_struct *tty, struct file *file);
static int tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear);
static int get_stats(MGSLPC_INFO *info, struct mgsl_icount __user *user_icount);
static int get_params(MGSLPC_INFO *info, MGSL_PARAMS __user *user_params);
static int set_params(MGSLPC_INFO *info, MGSL_PARAMS __user *new_params);
static int get_txidle(MGSLPC_INFO *info, int __user *idle_mode);
static int set_txidle(MGSLPC_INFO *info, int idle_mode);
static int set_txenable(MGSLPC_INFO *info, int enable);
static int tx_abort(MGSLPC_INFO *info);
static int set_rxenable(MGSLPC_INFO *info, int enable);
static int wait_events(MGSLPC_INFO *info, int __user *mask);
static MGSLPC_INFO *mgslpc_device_list = NULL;
static int mgslpc_device_count = 0;
/*
* Set this param to non-zero to load eax with the
* .text section address and breakpoint on module load.
* This is useful for use with gdb and add-symbol-file command.
*/
static int break_on_load=0;
/*
* Driver major number, defaults to zero to get auto
* assigned major number. May be forced as module parameter.
*/
static int ttymajor=0;
static int debug_level = 0;
static int maxframe[MAX_DEVICE_COUNT] = {0,};
static int dosyncppp[MAX_DEVICE_COUNT] = {1,1,1,1};
module_param(break_on_load, bool, 0);
module_param(ttymajor, int, 0);
module_param(debug_level, int, 0);
module_param_array(maxframe, int, NULL, 0);
module_param_array(dosyncppp, int, NULL, 0);
MODULE_LICENSE("GPL");
static char *driver_name = "SyncLink PC Card driver";
static char *driver_version = "$Revision: 4.34 $";
static struct tty_driver *serial_driver;
/* number of characters left in xmit buffer before we ask for more */
#define WAKEUP_CHARS 256
static void mgslpc_change_params(MGSLPC_INFO *info);
static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout);
/* PCMCIA prototypes */
static int mgslpc_config(struct pcmcia_device *link);
static void mgslpc_release(u_long arg);
static void mgslpc_detach(struct pcmcia_device *p_dev);
/*
* 1st function defined in .text section. Calling this function in
* init_module() followed by a breakpoint allows a remote debugger
* (gdb) to get the .text address for the add-symbol-file command.
* This allows remote debugging of dynamically loadable modules.
*/
static void* mgslpc_get_text_ptr(void)
{
return mgslpc_get_text_ptr;
}
/**
* line discipline callback wrappers
*
* The wrappers maintain line discipline references
* while calling into the line discipline.
*
* ldisc_receive_buf - pass receive data to line discipline
*/
static void ldisc_receive_buf(struct tty_struct *tty,
const __u8 *data, char *flags, int count)
{
struct tty_ldisc *ld;
if (!tty)
return;
ld = tty_ldisc_ref(tty);
if (ld) {
if (ld->ops->receive_buf)
ld->ops->receive_buf(tty, data, flags, count);
tty_ldisc_deref(ld);
}
}
static int mgslpc_probe(struct pcmcia_device *link)
{
MGSLPC_INFO *info;
int ret;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("mgslpc_attach\n");
info = kzalloc(sizeof(MGSLPC_INFO), GFP_KERNEL);
if (!info) {
printk("Error can't allocate device instance data\n");
return -ENOMEM;
}
info->magic = MGSLPC_MAGIC;
INIT_WORK(&info->task, bh_handler);
info->max_frame_size = 4096;
info->close_delay = 5*HZ/10;
info->closing_wait = 30*HZ;
init_waitqueue_head(&info->open_wait);
init_waitqueue_head(&info->close_wait);
init_waitqueue_head(&info->status_event_wait_q);
init_waitqueue_head(&info->event_wait_q);
spin_lock_init(&info->lock);
spin_lock_init(&info->netlock);
memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
info->idle_mode = HDLC_TXIDLE_FLAGS;
info->imra_value = 0xffff;
info->imrb_value = 0xffff;
info->pim_value = 0xff;
info->p_dev = link;
link->priv = info;
/* Initialize the struct pcmcia_device structure */
/* Interrupt setup */
link->irq.Attributes = IRQ_TYPE_EXCLUSIVE;
link->irq.IRQInfo1 = IRQ_LEVEL_ID;
link->irq.Handler = NULL;
link->conf.Attributes = 0;
link->conf.IntType = INT_MEMORY_AND_IO;
ret = mgslpc_config(link);
if (ret)
return ret;
mgslpc_add_device(info);
return 0;
}
/* Card has been inserted.
*/
#define CS_CHECK(fn, ret) \
do { last_fn = (fn); if ((last_ret = (ret)) != 0) goto cs_failed; } while (0)
static int mgslpc_config(struct pcmcia_device *link)
{
MGSLPC_INFO *info = link->priv;
tuple_t tuple;
cisparse_t parse;
int last_fn, last_ret;
u_char buf[64];
cistpl_cftable_entry_t dflt = { 0 };
cistpl_cftable_entry_t *cfg;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("mgslpc_config(0x%p)\n", link);
tuple.Attributes = 0;
tuple.TupleData = buf;
tuple.TupleDataMax = sizeof(buf);
tuple.TupleOffset = 0;
/* get CIS configuration entry */
tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
CS_CHECK(GetFirstTuple, pcmcia_get_first_tuple(link, &tuple));
cfg = &(parse.cftable_entry);
CS_CHECK(GetTupleData, pcmcia_get_tuple_data(link, &tuple));
CS_CHECK(ParseTuple, pcmcia_parse_tuple(link, &tuple, &parse));
if (cfg->flags & CISTPL_CFTABLE_DEFAULT) dflt = *cfg;
if (cfg->index == 0)
goto cs_failed;
link->conf.ConfigIndex = cfg->index;
link->conf.Attributes |= CONF_ENABLE_IRQ;
/* IO window settings */
link->io.NumPorts1 = 0;
if ((cfg->io.nwin > 0) || (dflt.io.nwin > 0)) {
cistpl_io_t *io = (cfg->io.nwin) ? &cfg->io : &dflt.io;
link->io.Attributes1 = IO_DATA_PATH_WIDTH_AUTO;
if (!(io->flags & CISTPL_IO_8BIT))
link->io.Attributes1 = IO_DATA_PATH_WIDTH_16;
if (!(io->flags & CISTPL_IO_16BIT))
link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
link->io.IOAddrLines = io->flags & CISTPL_IO_LINES_MASK;
link->io.BasePort1 = io->win[0].base;
link->io.NumPorts1 = io->win[0].len;
CS_CHECK(RequestIO, pcmcia_request_io(link, &link->io));
}
link->conf.Attributes = CONF_ENABLE_IRQ;
link->conf.IntType = INT_MEMORY_AND_IO;
link->conf.ConfigIndex = 8;
link->conf.Present = PRESENT_OPTION;
link->irq.Attributes |= IRQ_HANDLE_PRESENT;
link->irq.Handler = mgslpc_isr;
link->irq.Instance = info;
CS_CHECK(RequestIRQ, pcmcia_request_irq(link, &link->irq));
CS_CHECK(RequestConfiguration, pcmcia_request_configuration(link, &link->conf));
info->io_base = link->io.BasePort1;
info->irq_level = link->irq.AssignedIRQ;
/* add to linked list of devices */
sprintf(info->node.dev_name, "mgslpc0");
info->node.major = info->node.minor = 0;
link->dev_node = &info->node;
printk(KERN_INFO "%s: index 0x%02x:",
info->node.dev_name, link->conf.ConfigIndex);
if (link->conf.Attributes & CONF_ENABLE_IRQ)
printk(", irq %d", link->irq.AssignedIRQ);
if (link->io.NumPorts1)
printk(", io 0x%04x-0x%04x", link->io.BasePort1,
link->io.BasePort1+link->io.NumPorts1-1);
printk("\n");
return 0;
cs_failed:
cs_error(link, last_fn, last_ret);
mgslpc_release((u_long)link);
return -ENODEV;
}
/* Card has been removed.
* Unregister device and release PCMCIA configuration.
* If device is open, postpone until it is closed.
*/
static void mgslpc_release(u_long arg)
{
struct pcmcia_device *link = (struct pcmcia_device *)arg;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("mgslpc_release(0x%p)\n", link);
pcmcia_disable_device(link);
}
static void mgslpc_detach(struct pcmcia_device *link)
{
if (debug_level >= DEBUG_LEVEL_INFO)
printk("mgslpc_detach(0x%p)\n", link);
((MGSLPC_INFO *)link->priv)->stop = 1;
mgslpc_release((u_long)link);
mgslpc_remove_device((MGSLPC_INFO *)link->priv);
}
static int mgslpc_suspend(struct pcmcia_device *link)
{
MGSLPC_INFO *info = link->priv;
info->stop = 1;
return 0;
}
static int mgslpc_resume(struct pcmcia_device *link)
{
MGSLPC_INFO *info = link->priv;
info->stop = 0;
return 0;
}
static inline bool mgslpc_paranoia_check(MGSLPC_INFO *info,
char *name, const char *routine)
{
#ifdef MGSLPC_PARANOIA_CHECK
static const char *badmagic =
"Warning: bad magic number for mgsl struct (%s) in %s\n";
static const char *badinfo =
"Warning: null mgslpc_info for (%s) in %s\n";
if (!info) {
printk(badinfo, name, routine);
return true;
}
if (info->magic != MGSLPC_MAGIC) {
printk(badmagic, name, routine);
return true;
}
#else
if (!info)
return true;
#endif
return false;
}
#define CMD_RXFIFO BIT7 // release current rx FIFO
#define CMD_RXRESET BIT6 // receiver reset
#define CMD_RXFIFO_READ BIT5
#define CMD_START_TIMER BIT4
#define CMD_TXFIFO BIT3 // release current tx FIFO
#define CMD_TXEOM BIT1 // transmit end message
#define CMD_TXRESET BIT0 // transmit reset
static bool wait_command_complete(MGSLPC_INFO *info, unsigned char channel)
{
int i = 0;
/* wait for command completion */
while (read_reg(info, (unsigned char)(channel+STAR)) & BIT2) {
udelay(1);
if (i++ == 1000)
return false;
}
return true;
}
static void issue_command(MGSLPC_INFO *info, unsigned char channel, unsigned char cmd)
{
wait_command_complete(info, channel);
write_reg(info, (unsigned char) (channel + CMDR), cmd);
}
static void tx_pause(struct tty_struct *tty)
{
MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
unsigned long flags;
if (mgslpc_paranoia_check(info, tty->name, "tx_pause"))
return;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("tx_pause(%s)\n",info->device_name);
spin_lock_irqsave(&info->lock,flags);
if (info->tx_enabled)
tx_stop(info);
spin_unlock_irqrestore(&info->lock,flags);
}
static void tx_release(struct tty_struct *tty)
{
MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
unsigned long flags;
if (mgslpc_paranoia_check(info, tty->name, "tx_release"))
return;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("tx_release(%s)\n",info->device_name);
spin_lock_irqsave(&info->lock,flags);
if (!info->tx_enabled)
tx_start(info);
spin_unlock_irqrestore(&info->lock,flags);
}
/* Return next bottom half action to perform.
* or 0 if nothing to do.
*/
static int bh_action(MGSLPC_INFO *info)
{
unsigned long flags;
int rc = 0;
spin_lock_irqsave(&info->lock,flags);
if (info->pending_bh & BH_RECEIVE) {
info->pending_bh &= ~BH_RECEIVE;
rc = BH_RECEIVE;
} else if (info->pending_bh & BH_TRANSMIT) {
info->pending_bh &= ~BH_TRANSMIT;
rc = BH_TRANSMIT;
} else if (info->pending_bh & BH_STATUS) {
info->pending_bh &= ~BH_STATUS;
rc = BH_STATUS;
}
if (!rc) {
/* Mark BH routine as complete */
info->bh_running = false;
info->bh_requested = false;
}
spin_unlock_irqrestore(&info->lock,flags);
return rc;
}
static void bh_handler(struct work_struct *work)
{
MGSLPC_INFO *info = container_of(work, MGSLPC_INFO, task);
int action;
if (!info)
return;
if (debug_level >= DEBUG_LEVEL_BH)
printk( "%s(%d):bh_handler(%s) entry\n",
__FILE__,__LINE__,info->device_name);
info->bh_running = true;
while((action = bh_action(info)) != 0) {
/* Process work item */
if ( debug_level >= DEBUG_LEVEL_BH )
printk( "%s(%d):bh_handler() work item action=%d\n",
__FILE__,__LINE__,action);
switch (action) {
case BH_RECEIVE:
while(rx_get_frame(info));
break;
case BH_TRANSMIT:
bh_transmit(info);
break;
case BH_STATUS:
bh_status(info);
break;
default:
/* unknown work item ID */
printk("Unknown work item ID=%08X!\n", action);
break;
}
}
if (debug_level >= DEBUG_LEVEL_BH)
printk( "%s(%d):bh_handler(%s) exit\n",
__FILE__,__LINE__,info->device_name);
}
static void bh_transmit(MGSLPC_INFO *info)
{
struct tty_struct *tty = info->tty;
if (debug_level >= DEBUG_LEVEL_BH)
printk("bh_transmit() entry on %s\n", info->device_name);
if (tty)
tty_wakeup(tty);
}
static void bh_status(MGSLPC_INFO *info)
{
info->ri_chkcount = 0;
info->dsr_chkcount = 0;
info->dcd_chkcount = 0;
info->cts_chkcount = 0;
}
/* eom: non-zero = end of frame */
static void rx_ready_hdlc(MGSLPC_INFO *info, int eom)
{
unsigned char data[2];
unsigned char fifo_count, read_count, i;
RXBUF *buf = (RXBUF*)(info->rx_buf + (info->rx_put * info->rx_buf_size));
if (debug_level >= DEBUG_LEVEL_ISR)
printk("%s(%d):rx_ready_hdlc(eom=%d)\n",__FILE__,__LINE__,eom);
if (!info->rx_enabled)
return;
if (info->rx_frame_count >= info->rx_buf_count) {
/* no more free buffers */
issue_command(info, CHA, CMD_RXRESET);
info->pending_bh |= BH_RECEIVE;
info->rx_overflow = true;
info->icount.buf_overrun++;
return;
}
if (eom) {
/* end of frame, get FIFO count from RBCL register */
if (!(fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f)))
fifo_count = 32;
} else
fifo_count = 32;
do {
if (fifo_count == 1) {
read_count = 1;
data[0] = read_reg(info, CHA + RXFIFO);
} else {
read_count = 2;
*((unsigned short *) data) = read_reg16(info, CHA + RXFIFO);
}
fifo_count -= read_count;
if (!fifo_count && eom)
buf->status = data[--read_count];
for (i = 0; i < read_count; i++) {
if (buf->count >= info->max_frame_size) {
/* frame too large, reset receiver and reset current buffer */
issue_command(info, CHA, CMD_RXRESET);
buf->count = 0;
return;
}
*(buf->data + buf->count) = data[i];
buf->count++;
}
} while (fifo_count);
if (eom) {
info->pending_bh |= BH_RECEIVE;
info->rx_frame_count++;
info->rx_put++;
if (info->rx_put >= info->rx_buf_count)
info->rx_put = 0;
}
issue_command(info, CHA, CMD_RXFIFO);
}
static void rx_ready_async(MGSLPC_INFO *info, int tcd)
{
unsigned char data, status, flag;
int fifo_count;
int work = 0;
struct tty_struct *tty = info->tty;
struct mgsl_icount *icount = &info->icount;
if (tcd) {
/* early termination, get FIFO count from RBCL register */
fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
/* Zero fifo count could mean 0 or 32 bytes available.
* If BIT5 of STAR is set then at least 1 byte is available.
*/
if (!fifo_count && (read_reg(info,CHA+STAR) & BIT5))
fifo_count = 32;
} else
fifo_count = 32;
tty_buffer_request_room(tty, fifo_count);
/* Flush received async data to receive data buffer. */
while (fifo_count) {
data = read_reg(info, CHA + RXFIFO);
status = read_reg(info, CHA + RXFIFO);
fifo_count -= 2;
icount->rx++;
flag = TTY_NORMAL;
// if no frameing/crc error then save data
// BIT7:parity error
// BIT6:framing error
if (status & (BIT7 + BIT6)) {
if (status & BIT7)
icount->parity++;
else
icount->frame++;
/* discard char if tty control flags say so */
if (status & info->ignore_status_mask)
continue;
status &= info->read_status_mask;
if (status & BIT7)
flag = TTY_PARITY;
else if (status & BIT6)
flag = TTY_FRAME;
}
work += tty_insert_flip_char(tty, data, flag);
}
issue_command(info, CHA, CMD_RXFIFO);
if (debug_level >= DEBUG_LEVEL_ISR) {
printk("%s(%d):rx_ready_async",
__FILE__,__LINE__);
printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
__FILE__,__LINE__,icount->rx,icount->brk,
icount->parity,icount->frame,icount->overrun);
}
if (work)
tty_flip_buffer_push(tty);
}
static void tx_done(MGSLPC_INFO *info)
{
if (!info->tx_active)
return;
info->tx_active = false;
info->tx_aborting = false;
if (info->params.mode == MGSL_MODE_ASYNC)
return;
info->tx_count = info->tx_put = info->tx_get = 0;
del_timer(&info->tx_timer);
if (info->drop_rts_on_tx_done) {
get_signals(info);
if (info->serial_signals & SerialSignal_RTS) {
info->serial_signals &= ~SerialSignal_RTS;
set_signals(info);
}
info->drop_rts_on_tx_done = false;
}
#if SYNCLINK_GENERIC_HDLC
if (info->netcount)
hdlcdev_tx_done(info);
else
#endif
{
if (info->tty->stopped || info->tty->hw_stopped) {
tx_stop(info);
return;
}
info->pending_bh |= BH_TRANSMIT;
}
}
static void tx_ready(MGSLPC_INFO *info)
{
unsigned char fifo_count = 32;
int c;
if (debug_level >= DEBUG_LEVEL_ISR)
printk("%s(%d):tx_ready(%s)\n", __FILE__,__LINE__,info->device_name);
if (info->params.mode == MGSL_MODE_HDLC) {
if (!info->tx_active)
return;
} else {
if (info->tty->stopped || info->tty->hw_stopped) {
tx_stop(info);
return;
}
if (!info->tx_count)
info->tx_active = false;
}
if (!info->tx_count)
return;
while (info->tx_count && fifo_count) {
c = min(2, min_t(int, fifo_count, min(info->tx_count, TXBUFSIZE - info->tx_get)));
if (c == 1) {
write_reg(info, CHA + TXFIFO, *(info->tx_buf + info->tx_get));
} else {
write_reg16(info, CHA + TXFIFO,
*((unsigned short*)(info->tx_buf + info->tx_get)));
}
info->tx_count -= c;
info->tx_get = (info->tx_get + c) & (TXBUFSIZE - 1);
fifo_count -= c;
}
if (info->params.mode == MGSL_MODE_ASYNC) {
if (info->tx_count < WAKEUP_CHARS)
info->pending_bh |= BH_TRANSMIT;
issue_command(info, CHA, CMD_TXFIFO);
} else {
if (info->tx_count)
issue_command(info, CHA, CMD_TXFIFO);
else
issue_command(info, CHA, CMD_TXFIFO + CMD_TXEOM);
}
}
static void cts_change(MGSLPC_INFO *info)
{
get_signals(info);
if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
irq_disable(info, CHB, IRQ_CTS);
info->icount.cts++;
if (info->serial_signals & SerialSignal_CTS)
info->input_signal_events.cts_up++;
else
info->input_signal_events.cts_down++;
wake_up_interruptible(&info->status_event_wait_q);
wake_up_interruptible(&info->event_wait_q);
if (info->flags & ASYNC_CTS_FLOW) {
if (info->tty->hw_stopped) {
if (info->serial_signals & SerialSignal_CTS) {
if (debug_level >= DEBUG_LEVEL_ISR)
printk("CTS tx start...");
if (info->tty)
info->tty->hw_stopped = 0;
tx_start(info);
info->pending_bh |= BH_TRANSMIT;
return;
}
} else {
if (!(info->serial_signals & SerialSignal_CTS)) {
if (debug_level >= DEBUG_LEVEL_ISR)
printk("CTS tx stop...");
if (info->tty)
info->tty->hw_stopped = 1;
tx_stop(info);
}
}
}
info->pending_bh |= BH_STATUS;
}
static void dcd_change(MGSLPC_INFO *info)
{
get_signals(info);
if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
irq_disable(info, CHB, IRQ_DCD);
info->icount.dcd++;
if (info->serial_signals & SerialSignal_DCD) {
info->input_signal_events.dcd_up++;
}
else
info->input_signal_events.dcd_down++;
#if SYNCLINK_GENERIC_HDLC
if (info->netcount) {
if (info->serial_signals & SerialSignal_DCD)
netif_carrier_on(info->netdev);
else
netif_carrier_off(info->netdev);
}
#endif
wake_up_interruptible(&info->status_event_wait_q);
wake_up_interruptible(&info->event_wait_q);
if (info->flags & ASYNC_CHECK_CD) {
if (debug_level >= DEBUG_LEVEL_ISR)
printk("%s CD now %s...", info->device_name,
(info->serial_signals & SerialSignal_DCD) ? "on" : "off");
if (info->serial_signals & SerialSignal_DCD)
wake_up_interruptible(&info->open_wait);
else {
if (debug_level >= DEBUG_LEVEL_ISR)
printk("doing serial hangup...");
if (info->tty)
tty_hangup(info->tty);
}
}
info->pending_bh |= BH_STATUS;
}
static void dsr_change(MGSLPC_INFO *info)
{
get_signals(info);
if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
port_irq_disable(info, PVR_DSR);
info->icount.dsr++;
if (info->serial_signals & SerialSignal_DSR)
info->input_signal_events.dsr_up++;
else
info->input_signal_events.dsr_down++;
wake_up_interruptible(&info->status_event_wait_q);
wake_up_interruptible(&info->event_wait_q);
info->pending_bh |= BH_STATUS;
}
static void ri_change(MGSLPC_INFO *info)
{
get_signals(info);
if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
port_irq_disable(info, PVR_RI);
info->icount.rng++;
if (info->serial_signals & SerialSignal_RI)
info->input_signal_events.ri_up++;
else
info->input_signal_events.ri_down++;
wake_up_interruptible(&info->status_event_wait_q);
wake_up_interruptible(&info->event_wait_q);
info->pending_bh |= BH_STATUS;
}
/* Interrupt service routine entry point.
*
* Arguments:
*
* irq interrupt number that caused interrupt
* dev_id device ID supplied during interrupt registration
*/
static irqreturn_t mgslpc_isr(int dummy, void *dev_id)
{
MGSLPC_INFO *info = dev_id;
unsigned short isr;
unsigned char gis, pis;
int count=0;
if (debug_level >= DEBUG_LEVEL_ISR)
printk("mgslpc_isr(%d) entry.\n", info->irq_level);
if (!(info->p_dev->_locked))
return IRQ_HANDLED;
spin_lock(&info->lock);
while ((gis = read_reg(info, CHA + GIS))) {
if (debug_level >= DEBUG_LEVEL_ISR)
printk("mgslpc_isr %s gis=%04X\n", info->device_name,gis);
if ((gis & 0x70) || count > 1000) {
printk("synclink_cs:hardware failed or ejected\n");
break;
}
count++;
if (gis & (BIT1 + BIT0)) {
isr = read_reg16(info, CHB + ISR);
if (isr & IRQ_DCD)
dcd_change(info);
if (isr & IRQ_CTS)
cts_change(info);
}
if (gis & (BIT3 + BIT2))
{
isr = read_reg16(info, CHA + ISR);
if (isr & IRQ_TIMER) {
info->irq_occurred = true;
irq_disable(info, CHA, IRQ_TIMER);
}
/* receive IRQs */
if (isr & IRQ_EXITHUNT) {
info->icount.exithunt++;
wake_up_interruptible(&info->event_wait_q);
}
if (isr & IRQ_BREAK_ON) {
info->icount.brk++;
if (info->flags & ASYNC_SAK)
do_SAK(info->tty);
}
if (isr & IRQ_RXTIME) {
issue_command(info, CHA, CMD_RXFIFO_READ);
}
if (isr & (IRQ_RXEOM + IRQ_RXFIFO)) {
if (info->params.mode == MGSL_MODE_HDLC)
rx_ready_hdlc(info, isr & IRQ_RXEOM);
else
rx_ready_async(info, isr & IRQ_RXEOM);
}
/* transmit IRQs */
if (isr & IRQ_UNDERRUN) {
if (info->tx_aborting)
info->icount.txabort++;
else
info->icount.txunder++;
tx_done(info);
}
else if (isr & IRQ_ALLSENT) {
info->icount.txok++;
tx_done(info);
}
else if (isr & IRQ_TXFIFO)
tx_ready(info);
}
if (gis & BIT7) {
pis = read_reg(info, CHA + PIS);
if (pis & BIT1)
dsr_change(info);
if (pis & BIT2)
ri_change(info);
}
}
/* Request bottom half processing if there's something
* for it to do and the bh is not already running
*/
if (info->pending_bh && !info->bh_running && !info->bh_requested) {
if ( debug_level >= DEBUG_LEVEL_ISR )
printk("%s(%d):%s queueing bh task.\n",
__FILE__,__LINE__,info->device_name);
schedule_work(&info->task);
info->bh_requested = true;
}
spin_unlock(&info->lock);
if (debug_level >= DEBUG_LEVEL_ISR)
printk("%s(%d):mgslpc_isr(%d)exit.\n",
__FILE__, __LINE__, info->irq_level);
return IRQ_HANDLED;
}
/* Initialize and start device.
*/
static int startup(MGSLPC_INFO * info)
{
int retval = 0;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):startup(%s)\n",__FILE__,__LINE__,info->device_name);
if (info->flags & ASYNC_INITIALIZED)
return 0;
if (!info->tx_buf) {
/* allocate a page of memory for a transmit buffer */
info->tx_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
if (!info->tx_buf) {
printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
__FILE__,__LINE__,info->device_name);
return -ENOMEM;
}
}
info->pending_bh = 0;
memset(&info->icount, 0, sizeof(info->icount));
setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
/* Allocate and claim adapter resources */
retval = claim_resources(info);
/* perform existance check and diagnostics */
if ( !retval )
retval = adapter_test(info);
if ( retval ) {
if (capable(CAP_SYS_ADMIN) && info->tty)
set_bit(TTY_IO_ERROR, &info->tty->flags);
release_resources(info);
return retval;
}
/* program hardware for current parameters */
mgslpc_change_params(info);
if (info->tty)
clear_bit(TTY_IO_ERROR, &info->tty->flags);
info->flags |= ASYNC_INITIALIZED;
return 0;
}
/* Called by mgslpc_close() and mgslpc_hangup() to shutdown hardware
*/
static void shutdown(MGSLPC_INFO * info)
{
unsigned long flags;
if (!(info->flags & ASYNC_INITIALIZED))
return;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgslpc_shutdown(%s)\n",
__FILE__,__LINE__, info->device_name );
/* clear status wait queue because status changes */
/* can't happen after shutting down the hardware */
wake_up_interruptible(&info->status_event_wait_q);
wake_up_interruptible(&info->event_wait_q);
del_timer_sync(&info->tx_timer);
if (info->tx_buf) {
free_page((unsigned long) info->tx_buf);
info->tx_buf = NULL;
}
spin_lock_irqsave(&info->lock,flags);
rx_stop(info);
tx_stop(info);
/* TODO:disable interrupts instead of reset to preserve signal states */
reset_device(info);
if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
set_signals(info);
}
spin_unlock_irqrestore(&info->lock,flags);
release_resources(info);
if (info->tty)
set_bit(TTY_IO_ERROR, &info->tty->flags);
info->flags &= ~ASYNC_INITIALIZED;
}
static void mgslpc_program_hw(MGSLPC_INFO *info)
{
unsigned long flags;
spin_lock_irqsave(&info->lock,flags);
rx_stop(info);
tx_stop(info);
info->tx_count = info->tx_put = info->tx_get = 0;
if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
hdlc_mode(info);
else
async_mode(info);
set_signals(info);
info->dcd_chkcount = 0;
info->cts_chkcount = 0;
info->ri_chkcount = 0;
info->dsr_chkcount = 0;
irq_enable(info, CHB, IRQ_DCD | IRQ_CTS);
port_irq_enable(info, (unsigned char) PVR_DSR | PVR_RI);
get_signals(info);
if (info->netcount || info->tty->termios->c_cflag & CREAD)
rx_start(info);
spin_unlock_irqrestore(&info->lock,flags);
}
/* Reconfigure adapter based on new parameters
*/
static void mgslpc_change_params(MGSLPC_INFO *info)
{
unsigned cflag;
int bits_per_char;
if (!info->tty || !info->tty->termios)
return;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgslpc_change_params(%s)\n",
__FILE__,__LINE__, info->device_name );
cflag = info->tty->termios->c_cflag;
/* if B0 rate (hangup) specified then negate DTR and RTS */
/* otherwise assert DTR and RTS */
if (cflag & CBAUD)
info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
else
info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
/* byte size and parity */
switch (cflag & CSIZE) {
case CS5: info->params.data_bits = 5; break;
case CS6: info->params.data_bits = 6; break;
case CS7: info->params.data_bits = 7; break;
case CS8: info->params.data_bits = 8; break;
default: info->params.data_bits = 7; break;
}
if (cflag & CSTOPB)
info->params.stop_bits = 2;
else
info->params.stop_bits = 1;
info->params.parity = ASYNC_PARITY_NONE;
if (cflag & PARENB) {
if (cflag & PARODD)
info->params.parity = ASYNC_PARITY_ODD;
else
info->params.parity = ASYNC_PARITY_EVEN;
#ifdef CMSPAR
if (cflag & CMSPAR)
info->params.parity = ASYNC_PARITY_SPACE;
#endif
}
/* calculate number of jiffies to transmit a full
* FIFO (32 bytes) at specified data rate
*/
bits_per_char = info->params.data_bits +
info->params.stop_bits + 1;
/* if port data rate is set to 460800 or less then
* allow tty settings to override, otherwise keep the
* current data rate.
*/
if (info->params.data_rate <= 460800) {
info->params.data_rate = tty_get_baud_rate(info->tty);
}
if ( info->params.data_rate ) {
info->timeout = (32*HZ*bits_per_char) /
info->params.data_rate;
}
info->timeout += HZ/50; /* Add .02 seconds of slop */
if (cflag & CRTSCTS)
info->flags |= ASYNC_CTS_FLOW;
else
info->flags &= ~ASYNC_CTS_FLOW;
if (cflag & CLOCAL)
info->flags &= ~ASYNC_CHECK_CD;
else
info->flags |= ASYNC_CHECK_CD;
/* process tty input control flags */
info->read_status_mask = 0;
if (I_INPCK(info->tty))
info->read_status_mask |= BIT7 | BIT6;
if (I_IGNPAR(info->tty))
info->ignore_status_mask |= BIT7 | BIT6;
mgslpc_program_hw(info);
}
/* Add a character to the transmit buffer
*/
static int mgslpc_put_char(struct tty_struct *tty, unsigned char ch)
{
MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO) {
printk( "%s(%d):mgslpc_put_char(%d) on %s\n",
__FILE__,__LINE__,ch,info->device_name);
}
if (mgslpc_paranoia_check(info, tty->name, "mgslpc_put_char"))
return 0;
if (!info->tx_buf)
return 0;
spin_lock_irqsave(&info->lock,flags);
if (info->params.mode == MGSL_MODE_ASYNC || !info->tx_active) {
if (info->tx_count < TXBUFSIZE - 1) {
info->tx_buf[info->tx_put++] = ch;
info->tx_put &= TXBUFSIZE-1;
info->tx_count++;
}
}
spin_unlock_irqrestore(&info->lock,flags);
return 1;
}
/* Enable transmitter so remaining characters in the
* transmit buffer are sent.
*/
static void mgslpc_flush_chars(struct tty_struct *tty)
{
MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk( "%s(%d):mgslpc_flush_chars() entry on %s tx_count=%d\n",
__FILE__,__LINE__,info->device_name,info->tx_count);
if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_chars"))
return;
if (info->tx_count <= 0 || tty->stopped ||
tty->hw_stopped || !info->tx_buf)
return;
if (debug_level >= DEBUG_LEVEL_INFO)
printk( "%s(%d):mgslpc_flush_chars() entry on %s starting transmitter\n",
__FILE__,__LINE__,info->device_name);
spin_lock_irqsave(&info->lock,flags);
if (!info->tx_active)
tx_start(info);
spin_unlock_irqrestore(&info->lock,flags);
}
/* Send a block of data
*
* Arguments:
*
* tty pointer to tty information structure
* buf pointer to buffer containing send data
* count size of send data in bytes
*
* Returns: number of characters written
*/
static int mgslpc_write(struct tty_struct * tty,
const unsigned char *buf, int count)
{
int c, ret = 0;
MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk( "%s(%d):mgslpc_write(%s) count=%d\n",
__FILE__,__LINE__,info->device_name,count);
if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write") ||
!info->tx_buf)
goto cleanup;
if (info->params.mode == MGSL_MODE_HDLC) {
if (count > TXBUFSIZE) {
ret = -EIO;
goto cleanup;
}
if (info->tx_active)
goto cleanup;
else if (info->tx_count)
goto start;
}
for (;;) {
c = min(count,
min(TXBUFSIZE - info->tx_count - 1,
TXBUFSIZE - info->tx_put));
if (c <= 0)
break;
memcpy(info->tx_buf + info->tx_put, buf, c);
spin_lock_irqsave(&info->lock,flags);
info->tx_put = (info->tx_put + c) & (TXBUFSIZE-1);
info->tx_count += c;
spin_unlock_irqrestore(&info->lock,flags);
buf += c;
count -= c;
ret += c;
}
start:
if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
spin_lock_irqsave(&info->lock,flags);
if (!info->tx_active)
tx_start(info);
spin_unlock_irqrestore(&info->lock,flags);
}
cleanup:
if (debug_level >= DEBUG_LEVEL_INFO)
printk( "%s(%d):mgslpc_write(%s) returning=%d\n",
__FILE__,__LINE__,info->device_name,ret);
return ret;
}
/* Return the count of free bytes in transmit buffer
*/
static int mgslpc_write_room(struct tty_struct *tty)
{
MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
int ret;
if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write_room"))
return 0;
if (info->params.mode == MGSL_MODE_HDLC) {
/* HDLC (frame oriented) mode */
if (info->tx_active)
return 0;
else
return HDLC_MAX_FRAME_SIZE;
} else {
ret = TXBUFSIZE - info->tx_count - 1;
if (ret < 0)
ret = 0;
}
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgslpc_write_room(%s)=%d\n",
__FILE__,__LINE__, info->device_name, ret);
return ret;
}
/* Return the count of bytes in transmit buffer
*/
static int mgslpc_chars_in_buffer(struct tty_struct *tty)
{
MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
int rc;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgslpc_chars_in_buffer(%s)\n",
__FILE__,__LINE__, info->device_name );
if (mgslpc_paranoia_check(info, tty->name, "mgslpc_chars_in_buffer"))
return 0;
if (info->params.mode == MGSL_MODE_HDLC)
rc = info->tx_active ? info->max_frame_size : 0;
else
rc = info->tx_count;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgslpc_chars_in_buffer(%s)=%d\n",
__FILE__,__LINE__, info->device_name, rc);
return rc;
}
/* Discard all data in the send buffer
*/
static void mgslpc_flush_buffer(struct tty_struct *tty)
{
MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgslpc_flush_buffer(%s) entry\n",
__FILE__,__LINE__, info->device_name );
if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_buffer"))
return;
spin_lock_irqsave(&info->lock,flags);
info->tx_count = info->tx_put = info->tx_get = 0;
del_timer(&info->tx_timer);
spin_unlock_irqrestore(&info->lock,flags);
wake_up_interruptible(&tty->write_wait);
tty_wakeup(tty);
}
/* Send a high-priority XON/XOFF character
*/
static void mgslpc_send_xchar(struct tty_struct *tty, char ch)
{
MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgslpc_send_xchar(%s,%d)\n",
__FILE__,__LINE__, info->device_name, ch );
if (mgslpc_paranoia_check(info, tty->name, "mgslpc_send_xchar"))
return;
info->x_char = ch;
if (ch) {
spin_lock_irqsave(&info->lock,flags);
if (!info->tx_enabled)
tx_start(info);
spin_unlock_irqrestore(&info->lock,flags);
}
}
/* Signal remote device to throttle send data (our receive data)
*/
static void mgslpc_throttle(struct tty_struct * tty)
{
MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgslpc_throttle(%s) entry\n",
__FILE__,__LINE__, info->device_name );
if (mgslpc_paranoia_check(info, tty->name, "mgslpc_throttle"))
return;
if (I_IXOFF(tty))
mgslpc_send_xchar(tty, STOP_CHAR(tty));
if (tty->termios->c_cflag & CRTSCTS) {
spin_lock_irqsave(&info->lock,flags);
info->serial_signals &= ~SerialSignal_RTS;
set_signals(info);
spin_unlock_irqrestore(&info->lock,flags);
}
}
/* Signal remote device to stop throttling send data (our receive data)
*/
static void mgslpc_unthrottle(struct tty_struct * tty)
{
MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgslpc_unthrottle(%s) entry\n",
__FILE__,__LINE__, info->device_name );
if (mgslpc_paranoia_check(info, tty->name, "mgslpc_unthrottle"))
return;
if (I_IXOFF(tty)) {
if (info->x_char)
info->x_char = 0;
else
mgslpc_send_xchar(tty, START_CHAR(tty));
}
if (tty->termios->c_cflag & CRTSCTS) {
spin_lock_irqsave(&info->lock,flags);
info->serial_signals |= SerialSignal_RTS;
set_signals(info);
spin_unlock_irqrestore(&info->lock,flags);
}
}
/* get the current serial statistics
*/
static int get_stats(MGSLPC_INFO * info, struct mgsl_icount __user *user_icount)
{
int err;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("get_params(%s)\n", info->device_name);
if (!user_icount) {
memset(&info->icount, 0, sizeof(info->icount));
} else {
COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
if (err)
return -EFAULT;
}
return 0;
}
/* get the current serial parameters
*/
static int get_params(MGSLPC_INFO * info, MGSL_PARAMS __user *user_params)
{
int err;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("get_params(%s)\n", info->device_name);
COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
if (err)
return -EFAULT;
return 0;
}
/* set the serial parameters
*
* Arguments:
*
* info pointer to device instance data
* new_params user buffer containing new serial params
*
* Returns: 0 if success, otherwise error code
*/
static int set_params(MGSLPC_INFO * info, MGSL_PARAMS __user *new_params)
{
unsigned long flags;
MGSL_PARAMS tmp_params;
int err;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):set_params %s\n", __FILE__,__LINE__,
info->device_name );
COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
if (err) {
if ( debug_level >= DEBUG_LEVEL_INFO )
printk( "%s(%d):set_params(%s) user buffer copy failed\n",
__FILE__,__LINE__,info->device_name);
return -EFAULT;
}
spin_lock_irqsave(&info->lock,flags);
memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
spin_unlock_irqrestore(&info->lock,flags);
mgslpc_change_params(info);
return 0;
}
static int get_txidle(MGSLPC_INFO * info, int __user *idle_mode)
{
int err;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("get_txidle(%s)=%d\n", info->device_name, info->idle_mode);
COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
if (err)
return -EFAULT;
return 0;
}
static int set_txidle(MGSLPC_INFO * info, int idle_mode)
{
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("set_txidle(%s,%d)\n", info->device_name, idle_mode);
spin_lock_irqsave(&info->lock,flags);
info->idle_mode = idle_mode;
tx_set_idle(info);
spin_unlock_irqrestore(&info->lock,flags);
return 0;
}
static int get_interface(MGSLPC_INFO * info, int __user *if_mode)
{
int err;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("get_interface(%s)=%d\n", info->device_name, info->if_mode);
COPY_TO_USER(err,if_mode, &info->if_mode, sizeof(int));
if (err)
return -EFAULT;
return 0;
}
static int set_interface(MGSLPC_INFO * info, int if_mode)
{
unsigned long flags;
unsigned char val;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("set_interface(%s,%d)\n", info->device_name, if_mode);
spin_lock_irqsave(&info->lock,flags);
info->if_mode = if_mode;
val = read_reg(info, PVR) & 0x0f;
switch (info->if_mode)
{
case MGSL_INTERFACE_RS232: val |= PVR_RS232; break;
case MGSL_INTERFACE_V35: val |= PVR_V35; break;
case MGSL_INTERFACE_RS422: val |= PVR_RS422; break;
}
write_reg(info, PVR, val);
spin_unlock_irqrestore(&info->lock,flags);
return 0;
}
static int set_txenable(MGSLPC_INFO * info, int enable)
{
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("set_txenable(%s,%d)\n", info->device_name, enable);
spin_lock_irqsave(&info->lock,flags);
if (enable) {
if (!info->tx_enabled)
tx_start(info);
} else {
if (info->tx_enabled)
tx_stop(info);
}
spin_unlock_irqrestore(&info->lock,flags);
return 0;
}
static int tx_abort(MGSLPC_INFO * info)
{
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("tx_abort(%s)\n", info->device_name);
spin_lock_irqsave(&info->lock,flags);
if (info->tx_active && info->tx_count &&
info->params.mode == MGSL_MODE_HDLC) {
/* clear data count so FIFO is not filled on next IRQ.
* This results in underrun and abort transmission.
*/
info->tx_count = info->tx_put = info->tx_get = 0;
info->tx_aborting = true;
}
spin_unlock_irqrestore(&info->lock,flags);
return 0;
}
static int set_rxenable(MGSLPC_INFO * info, int enable)
{
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("set_rxenable(%s,%d)\n", info->device_name, enable);
spin_lock_irqsave(&info->lock,flags);
if (enable) {
if (!info->rx_enabled)
rx_start(info);
} else {
if (info->rx_enabled)
rx_stop(info);
}
spin_unlock_irqrestore(&info->lock,flags);
return 0;
}
/* wait for specified event to occur
*
* Arguments: info pointer to device instance data
* mask pointer to bitmask of events to wait for
* Return Value: 0 if successful and bit mask updated with
* of events triggerred,
* otherwise error code
*/
static int wait_events(MGSLPC_INFO * info, int __user *mask_ptr)
{
unsigned long flags;
int s;
int rc=0;
struct mgsl_icount cprev, cnow;
int events;
int mask;
struct _input_signal_events oldsigs, newsigs;
DECLARE_WAITQUEUE(wait, current);
COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
if (rc)
return -EFAULT;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("wait_events(%s,%d)\n", info->device_name, mask);
spin_lock_irqsave(&info->lock,flags);
/* return immediately if state matches requested events */
get_signals(info);
s = info->serial_signals;
events = mask &
( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
if (events) {
spin_unlock_irqrestore(&info->lock,flags);
goto exit;
}
/* save current irq counts */
cprev = info->icount;
oldsigs = info->input_signal_events;
if ((info->params.mode == MGSL_MODE_HDLC) &&
(mask & MgslEvent_ExitHuntMode))
irq_enable(info, CHA, IRQ_EXITHUNT);
set_current_state(TASK_INTERRUPTIBLE);
add_wait_queue(&info->event_wait_q, &wait);
spin_unlock_irqrestore(&info->lock,flags);
for(;;) {
schedule();
if (signal_pending(current)) {
rc = -ERESTARTSYS;
break;
}
/* get current irq counts */
spin_lock_irqsave(&info->lock,flags);
cnow = info->icount;
newsigs = info->input_signal_events;
set_current_state(TASK_INTERRUPTIBLE);
spin_unlock_irqrestore(&info->lock,flags);
/* if no change, wait aborted for some reason */
if (newsigs.dsr_up == oldsigs.dsr_up &&
newsigs.dsr_down == oldsigs.dsr_down &&
newsigs.dcd_up == oldsigs.dcd_up &&
newsigs.dcd_down == oldsigs.dcd_down &&
newsigs.cts_up == oldsigs.cts_up &&
newsigs.cts_down == oldsigs.cts_down &&
newsigs.ri_up == oldsigs.ri_up &&
newsigs.ri_down == oldsigs.ri_down &&
cnow.exithunt == cprev.exithunt &&
cnow.rxidle == cprev.rxidle) {
rc = -EIO;
break;
}
events = mask &
( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
(newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
(newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
(newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
(newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
(newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
(newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
(newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
(cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
(cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
if (events)
break;
cprev = cnow;
oldsigs = newsigs;
}
remove_wait_queue(&info->event_wait_q, &wait);
set_current_state(TASK_RUNNING);
if (mask & MgslEvent_ExitHuntMode) {
spin_lock_irqsave(&info->lock,flags);
if (!waitqueue_active(&info->event_wait_q))
irq_disable(info, CHA, IRQ_EXITHUNT);
spin_unlock_irqrestore(&info->lock,flags);
}
exit:
if (rc == 0)
PUT_USER(rc, events, mask_ptr);
return rc;
}
static int modem_input_wait(MGSLPC_INFO *info,int arg)
{
unsigned long flags;
int rc;
struct mgsl_icount cprev, cnow;
DECLARE_WAITQUEUE(wait, current);
/* save current irq counts */
spin_lock_irqsave(&info->lock,flags);
cprev = info->icount;
add_wait_queue(&info->status_event_wait_q, &wait);
set_current_state(TASK_INTERRUPTIBLE);
spin_unlock_irqrestore(&info->lock,flags);
for(;;) {
schedule();
if (signal_pending(current)) {
rc = -ERESTARTSYS;
break;
}
/* get new irq counts */
spin_lock_irqsave(&info->lock,flags);
cnow = info->icount;
set_current_state(TASK_INTERRUPTIBLE);
spin_unlock_irqrestore(&info->lock,flags);
/* if no change, wait aborted for some reason */
if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
rc = -EIO;
break;
}
/* check for change in caller specified modem input */
if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
(arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
(arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
(arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
rc = 0;
break;
}
cprev = cnow;
}
remove_wait_queue(&info->status_event_wait_q, &wait);
set_current_state(TASK_RUNNING);
return rc;
}
/* return the state of the serial control and status signals
*/
static int tiocmget(struct tty_struct *tty, struct file *file)
{
MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
unsigned int result;
unsigned long flags;
spin_lock_irqsave(&info->lock,flags);
get_signals(info);
spin_unlock_irqrestore(&info->lock,flags);
result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s tiocmget() value=%08X\n",
__FILE__,__LINE__, info->device_name, result );
return result;
}
/* set modem control signals (DTR/RTS)
*/
static int tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear)
{
MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s tiocmset(%x,%x)\n",
__FILE__,__LINE__,info->device_name, set, clear);
if (set & TIOCM_RTS)
info->serial_signals |= SerialSignal_RTS;
if (set & TIOCM_DTR)
info->serial_signals |= SerialSignal_DTR;
if (clear & TIOCM_RTS)
info->serial_signals &= ~SerialSignal_RTS;
if (clear & TIOCM_DTR)
info->serial_signals &= ~SerialSignal_DTR;
spin_lock_irqsave(&info->lock,flags);
set_signals(info);
spin_unlock_irqrestore(&info->lock,flags);
return 0;
}
/* Set or clear transmit break condition
*
* Arguments: tty pointer to tty instance data
* break_state -1=set break condition, 0=clear
*/
static int mgslpc_break(struct tty_struct *tty, int break_state)
{
MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgslpc_break(%s,%d)\n",
__FILE__,__LINE__, info->device_name, break_state);
if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break"))
return -EINVAL;
spin_lock_irqsave(&info->lock,flags);
if (break_state == -1)
set_reg_bits(info, CHA+DAFO, BIT6);
else
clear_reg_bits(info, CHA+DAFO, BIT6);
spin_unlock_irqrestore(&info->lock,flags);
return 0;
}
/* Service an IOCTL request
*
* Arguments:
*
* tty pointer to tty instance data
* file pointer to associated file object for device
* cmd IOCTL command code
* arg command argument/context
*
* Return Value: 0 if success, otherwise error code
*/
static int mgslpc_ioctl(struct tty_struct *tty, struct file * file,
unsigned int cmd, unsigned long arg)
{
MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
info->device_name, cmd );
if (mgslpc_paranoia_check(info, tty->name, "mgslpc_ioctl"))
return -ENODEV;
if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
(cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
if (tty->flags & (1 << TTY_IO_ERROR))
return -EIO;
}
return ioctl_common(info, cmd, arg);
}
static int ioctl_common(MGSLPC_INFO *info, unsigned int cmd, unsigned long arg)
{
int error;
struct mgsl_icount cnow; /* kernel counter temps */
struct serial_icounter_struct __user *p_cuser; /* user space */
void __user *argp = (void __user *)arg;
unsigned long flags;
switch (cmd) {
case MGSL_IOCGPARAMS:
return get_params(info, argp);
case MGSL_IOCSPARAMS:
return set_params(info, argp);
case MGSL_IOCGTXIDLE:
return get_txidle(info, argp);
case MGSL_IOCSTXIDLE:
return set_txidle(info, (int)arg);
case MGSL_IOCGIF:
return get_interface(info, argp);
case MGSL_IOCSIF:
return set_interface(info,(int)arg);
case MGSL_IOCTXENABLE:
return set_txenable(info,(int)arg);
case MGSL_IOCRXENABLE:
return set_rxenable(info,(int)arg);
case MGSL_IOCTXABORT:
return tx_abort(info);
case MGSL_IOCGSTATS:
return get_stats(info, argp);
case MGSL_IOCWAITEVENT:
return wait_events(info, argp);
case TIOCMIWAIT:
return modem_input_wait(info,(int)arg);
case TIOCGICOUNT:
spin_lock_irqsave(&info->lock,flags);
cnow = info->icount;
spin_unlock_irqrestore(&info->lock,flags);
p_cuser = argp;
PUT_USER(error,cnow.cts, &p_cuser->cts);
if (error) return error;
PUT_USER(error,cnow.dsr, &p_cuser->dsr);
if (error) return error;
PUT_USER(error,cnow.rng, &p_cuser->rng);
if (error) return error;
PUT_USER(error,cnow.dcd, &p_cuser->dcd);
if (error) return error;
PUT_USER(error,cnow.rx, &p_cuser->rx);
if (error) return error;
PUT_USER(error,cnow.tx, &p_cuser->tx);
if (error) return error;
PUT_USER(error,cnow.frame, &p_cuser->frame);
if (error) return error;
PUT_USER(error,cnow.overrun, &p_cuser->overrun);
if (error) return error;
PUT_USER(error,cnow.parity, &p_cuser->parity);
if (error) return error;
PUT_USER(error,cnow.brk, &p_cuser->brk);
if (error) return error;
PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
if (error) return error;
return 0;
default:
return -ENOIOCTLCMD;
}
return 0;
}
/* Set new termios settings
*
* Arguments:
*
* tty pointer to tty structure
* termios pointer to buffer to hold returned old termios
*/
static void mgslpc_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
{
MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgslpc_set_termios %s\n", __FILE__,__LINE__,
tty->driver->name );
/* just return if nothing has changed */
if ((tty->termios->c_cflag == old_termios->c_cflag)
&& (RELEVANT_IFLAG(tty->termios->c_iflag)
== RELEVANT_IFLAG(old_termios->c_iflag)))
return;
mgslpc_change_params(info);
/* Handle transition to B0 status */
if (old_termios->c_cflag & CBAUD &&
!(tty->termios->c_cflag & CBAUD)) {
info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
spin_lock_irqsave(&info->lock,flags);
set_signals(info);
spin_unlock_irqrestore(&info->lock,flags);
}
/* Handle transition away from B0 status */
if (!(old_termios->c_cflag & CBAUD) &&
tty->termios->c_cflag & CBAUD) {
info->serial_signals |= SerialSignal_DTR;
if (!(tty->termios->c_cflag & CRTSCTS) ||
!test_bit(TTY_THROTTLED, &tty->flags)) {
info->serial_signals |= SerialSignal_RTS;
}
spin_lock_irqsave(&info->lock,flags);
set_signals(info);
spin_unlock_irqrestore(&info->lock,flags);
}
/* Handle turning off CRTSCTS */
if (old_termios->c_cflag & CRTSCTS &&
!(tty->termios->c_cflag & CRTSCTS)) {
tty->hw_stopped = 0;
tx_release(tty);
}
}
static void mgslpc_close(struct tty_struct *tty, struct file * filp)
{
MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
if (mgslpc_paranoia_check(info, tty->name, "mgslpc_close"))
return;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgslpc_close(%s) entry, count=%d\n",
__FILE__,__LINE__, info->device_name, info->count);
if (!info->count)
return;
if (tty_hung_up_p(filp))
goto cleanup;
if ((tty->count == 1) && (info->count != 1)) {
/*
* tty->count is 1 and the tty structure will be freed.
* info->count should be one in this case.
* if it's not, correct it so that the port is shutdown.
*/
printk("mgslpc_close: bad refcount; tty->count is 1, "
"info->count is %d\n", info->count);
info->count = 1;
}
info->count--;
/* if at least one open remaining, leave hardware active */
if (info->count)
goto cleanup;
info->flags |= ASYNC_CLOSING;
/* set tty->closing to notify line discipline to
* only process XON/XOFF characters. Only the N_TTY
* discipline appears to use this (ppp does not).
*/
tty->closing = 1;
/* wait for transmit data to clear all layers */
if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgslpc_close(%s) calling tty_wait_until_sent\n",
__FILE__,__LINE__, info->device_name );
tty_wait_until_sent(tty, info->closing_wait);
}
if (info->flags & ASYNC_INITIALIZED)
mgslpc_wait_until_sent(tty, info->timeout);
mgslpc_flush_buffer(tty);
tty_ldisc_flush(tty);
shutdown(info);
tty->closing = 0;
info->tty = NULL;
if (info->blocked_open) {
if (info->close_delay) {
msleep_interruptible(jiffies_to_msecs(info->close_delay));
}
wake_up_interruptible(&info->open_wait);
}
info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
wake_up_interruptible(&info->close_wait);
cleanup:
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgslpc_close(%s) exit, count=%d\n", __FILE__,__LINE__,
tty->driver->name, info->count);
}
/* Wait until the transmitter is empty.
*/
static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout)
{
MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
unsigned long orig_jiffies, char_time;
if (!info )
return;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgslpc_wait_until_sent(%s) entry\n",
__FILE__,__LINE__, info->device_name );
if (mgslpc_paranoia_check(info, tty->name, "mgslpc_wait_until_sent"))
return;
if (!(info->flags & ASYNC_INITIALIZED))
goto exit;
orig_jiffies = jiffies;
/* Set check interval to 1/5 of estimated time to
* send a character, and make it at least 1. The check
* interval should also be less than the timeout.
* Note: use tight timings here to satisfy the NIST-PCTS.
*/
if ( info->params.data_rate ) {
char_time = info->timeout/(32 * 5);
if (!char_time)
char_time++;
} else
char_time = 1;
if (timeout)
char_time = min_t(unsigned long, char_time, timeout);
if (info->params.mode == MGSL_MODE_HDLC) {
while (info->tx_active) {
msleep_interruptible(jiffies_to_msecs(char_time));
if (signal_pending(current))
break;
if (timeout && time_after(jiffies, orig_jiffies + timeout))
break;
}
} else {
while ((info->tx_count || info->tx_active) &&
info->tx_enabled) {
msleep_interruptible(jiffies_to_msecs(char_time));
if (signal_pending(current))
break;
if (timeout && time_after(jiffies, orig_jiffies + timeout))
break;
}
}
exit:
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgslpc_wait_until_sent(%s) exit\n",
__FILE__,__LINE__, info->device_name );
}
/* Called by tty_hangup() when a hangup is signaled.
* This is the same as closing all open files for the port.
*/
static void mgslpc_hangup(struct tty_struct *tty)
{
MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgslpc_hangup(%s)\n",
__FILE__,__LINE__, info->device_name );
if (mgslpc_paranoia_check(info, tty->name, "mgslpc_hangup"))
return;
mgslpc_flush_buffer(tty);
shutdown(info);
info->count = 0;
info->flags &= ~ASYNC_NORMAL_ACTIVE;
info->tty = NULL;
wake_up_interruptible(&info->open_wait);
}
/* Block the current process until the specified port
* is ready to be opened.
*/
static int block_til_ready(struct tty_struct *tty, struct file *filp,
MGSLPC_INFO *info)
{
DECLARE_WAITQUEUE(wait, current);
int retval;
bool do_clocal = false;
bool extra_count = false;
unsigned long flags;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):block_til_ready on %s\n",
__FILE__,__LINE__, tty->driver->name );
if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
/* nonblock mode is set or port is not enabled */
/* just verify that callout device is not active */
info->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
if (tty->termios->c_cflag & CLOCAL)
do_clocal = true;
/* Wait for carrier detect and the line to become
* free (i.e., not in use by the callout). While we are in
* this loop, info->count is dropped by one, so that
* mgslpc_close() knows when to free things. We restore it upon
* exit, either normal or abnormal.
*/
retval = 0;
add_wait_queue(&info->open_wait, &wait);
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):block_til_ready before block on %s count=%d\n",
__FILE__,__LINE__, tty->driver->name, info->count );
spin_lock_irqsave(&info->lock, flags);
if (!tty_hung_up_p(filp)) {
extra_count = true;
info->count--;
}
spin_unlock_irqrestore(&info->lock, flags);
info->blocked_open++;
while (1) {
if ((tty->termios->c_cflag & CBAUD)) {
spin_lock_irqsave(&info->lock,flags);
info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
set_signals(info);
spin_unlock_irqrestore(&info->lock,flags);
}
set_current_state(TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
retval = (info->flags & ASYNC_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS;
break;
}
spin_lock_irqsave(&info->lock,flags);
get_signals(info);
spin_unlock_irqrestore(&info->lock,flags);
if (!(info->flags & ASYNC_CLOSING) &&
(do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
break;
}
if (signal_pending(current)) {
retval = -ERESTARTSYS;
break;
}
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):block_til_ready blocking on %s count=%d\n",
__FILE__,__LINE__, tty->driver->name, info->count );
schedule();
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&info->open_wait, &wait);
if (extra_count)
info->count++;
info->blocked_open--;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):block_til_ready after blocking on %s count=%d\n",
__FILE__,__LINE__, tty->driver->name, info->count );
if (!retval)
info->flags |= ASYNC_NORMAL_ACTIVE;
return retval;
}
static int mgslpc_open(struct tty_struct *tty, struct file * filp)
{
MGSLPC_INFO *info;
int retval, line;
unsigned long flags;
/* verify range of specified line number */
line = tty->index;
if ((line < 0) || (line >= mgslpc_device_count)) {
printk("%s(%d):mgslpc_open with invalid line #%d.\n",
__FILE__,__LINE__,line);
return -ENODEV;
}
/* find the info structure for the specified line */
info = mgslpc_device_list;
while(info && info->line != line)
info = info->next_device;
if (mgslpc_paranoia_check(info, tty->name, "mgslpc_open"))
return -ENODEV;
tty->driver_data = info;
info->tty = tty;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgslpc_open(%s), old ref count = %d\n",
__FILE__,__LINE__,tty->driver->name, info->count);
/* If port is closing, signal caller to try again */
if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
if (info->flags & ASYNC_CLOSING)
interruptible_sleep_on(&info->close_wait);
retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS);
goto cleanup;
}
info->tty->low_latency = (