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Commit 7bcf97d1 authored by Jiri Slaby's avatar Jiri Slaby Committed by Linus Torvalds
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Char: moxa, merge 2 poll functions 

- merge 2 timers into one -- one can handle the emptywait as good as the other
- merge 2 separated poll functions into one, this allows handle the actions
  directly and simplifies the code
Signed-off-by: default avatarJiri Slaby <jirislaby@gmail.com>
Tested-by: default avatarOyvind Aabling <Oyvind.Aabling@uni-c.dk>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 74d7d97b
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Showing with 141 additions and 290 deletions
drivers/char/moxa.c
View file @ 7bcf97d1
......@@ -129,25 +129,22 @@ struct moxaq_str {
struct moxa_port {
struct moxa_board_conf *board;
struct tty_struct *tty;
void __iomem *tableAddr;
int type;
int close_delay;
int count;
int blocked_open;
int asyncflags;
unsigned long statusflags;
struct tty_struct *tty;
int cflag;
unsigned long statusflags;
wait_queue_head_t open_wait;
struct completion close_wait;
struct timer_list emptyTimer;
char lineCtrl;
void __iomem *tableAddr;
char DCDState;
char lowChkFlag;
ushort breakCnt;
u8 DCDState;
u8 lineCtrl;
u8 lowChkFlag;
};
struct mon_str {
......@@ -169,6 +166,7 @@ struct mon_str {
static int ttymajor = MOXAMAJOR;
static struct mon_str moxaLog;
static unsigned int moxaFuncTout = HZ / 2;
static unsigned int moxaLowWaterChk;
/* Variables for insmod */
#ifdef MODULE
static unsigned long baseaddr[MAX_BOARDS];
......@@ -214,13 +212,10 @@ static void moxa_set_tty_param(struct tty_struct *, struct ktermios *);
static int moxa_block_till_ready(struct tty_struct *, struct file *,
struct moxa_port *);
static void moxa_setup_empty_event(struct tty_struct *);
static void moxa_check_xmit_empty(unsigned long);
static void moxa_shut_down(struct moxa_port *);
static void moxa_receive_data(struct moxa_port *);
/*
* moxa board interface functions:
*/
static int MoxaDriverPoll(void);
static void MoxaPortEnable(struct moxa_port *);
static void MoxaPortDisable(struct moxa_port *);
static int MoxaPortSetTermio(struct moxa_port *, struct ktermios *, speed_t);
......@@ -228,17 +223,14 @@ static int MoxaPortGetLineOut(struct moxa_port *, int *, int *);
static void MoxaPortLineCtrl(struct moxa_port *, int, int);
static void MoxaPortFlowCtrl(struct moxa_port *, int, int, int, int, int);
static int MoxaPortLineStatus(struct moxa_port *);
static int MoxaPortDCDChange(struct moxa_port *);
static int MoxaPortDCDON(struct moxa_port *);
static void MoxaPortFlushData(struct moxa_port *, int);
static int MoxaPortWriteData(struct moxa_port *, unsigned char *, int);
static int MoxaPortReadData(struct moxa_port *, struct tty_struct *tty);
static int MoxaPortReadData(struct moxa_port *);
static int MoxaPortTxQueue(struct moxa_port *);
static int MoxaPortRxQueue(struct moxa_port *);
static int MoxaPortTxFree(struct moxa_port *);
static void MoxaPortTxDisable(struct moxa_port *);
static void MoxaPortTxEnable(struct moxa_port *);
static int MoxaPortResetBrkCnt(struct moxa_port *);
static int moxa_get_serial_info(struct moxa_port *, struct serial_struct __user *);
static int moxa_set_serial_info(struct moxa_port *, struct serial_struct __user *);
static void MoxaSetFifo(struct moxa_port *port, int enable);
......@@ -265,6 +257,20 @@ static void moxafunc(void __iomem *ofsAddr, int cmd, ushort arg)
moxa_wait_finish(ofsAddr);
}
static void moxa_low_water_check(void __iomem *ofsAddr)
{
u16 rptr, wptr, mask, len;
if (readb(ofsAddr + FlagStat) & Xoff_state) {
rptr = readw(ofsAddr + RXrptr);
wptr = readw(ofsAddr + RXwptr);
mask = readw(ofsAddr + RX_mask);
len = (wptr - rptr) & mask;
if (len <= Low_water)
moxafunc(ofsAddr, FC_SendXon, 0);
}
}
/*
* TTY operations
*/
......@@ -812,9 +818,6 @@ static int moxa_init_board(struct moxa_board_conf *brd, struct device *dev)
p->cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
init_waitqueue_head(&p->open_wait);
init_completion(&p->close_wait);
setup_timer(&p->emptyTimer, moxa_check_xmit_empty,
(unsigned long)p);
}
switch (brd->boardType) {
......@@ -857,12 +860,9 @@ static int moxa_init_board(struct moxa_board_conf *brd, struct device *dev)
static void moxa_board_deinit(struct moxa_board_conf *brd)
{
unsigned int i;
spin_lock_bh(&moxa_lock);
brd->ready = 0;
for (i = 0; i < MAX_PORTS_PER_BOARD; i++)
del_timer_sync(&brd->ports[i].emptyTimer);
spin_unlock_bh(&moxa_lock);
iounmap(brd->basemem);
brd->basemem = NULL;
kfree(brd->ports);
......@@ -1135,7 +1135,6 @@ static void moxa_close(struct tty_struct *tty, struct file *filp)
if (ch->asyncflags & ASYNC_INITIALIZED) {
moxa_setup_empty_event(tty);
tty_wait_until_sent(tty, 30 * HZ); /* 30 seconds timeout */
del_timer_sync(&ch->emptyTimer);
}
moxa_shut_down(ch);
MoxaPortFlushData(ch, 2);
......@@ -1160,15 +1159,14 @@ static int moxa_write(struct tty_struct *tty,
const unsigned char *buf, int count)
{
struct moxa_port *ch = tty->driver_data;
unsigned long flags;
int len;
if (ch == NULL)
return 0;
spin_lock_irqsave(&moxa_lock, flags);
spin_lock_bh(&moxa_lock);
len = MoxaPortWriteData(ch, (unsigned char *) buf, count);
spin_unlock_irqrestore(&moxa_lock, flags);
spin_unlock_bh(&moxa_lock);
/*********************************************
if ( !(ch->statusflags & LOWWAIT) &&
......@@ -1236,13 +1234,12 @@ static void moxa_flush_chars(struct tty_struct *tty)
static void moxa_put_char(struct tty_struct *tty, unsigned char c)
{
struct moxa_port *ch = tty->driver_data;
unsigned long flags;
if (ch == NULL)
return;
spin_lock_irqsave(&moxa_lock, flags);
spin_lock_bh(&moxa_lock);
MoxaPortWriteData(ch, &c, 1);
spin_unlock_irqrestore(&moxa_lock, flags);
spin_unlock_bh(&moxa_lock);
/************************************************
if ( !(ch->statusflags & LOWWAIT) && (MoxaPortTxFree(port) <= 100) )
*************************************************/
......@@ -1360,58 +1357,110 @@ static void moxa_hangup(struct tty_struct *tty)
wake_up_interruptible(&ch->open_wait);
}
static void moxa_poll(unsigned long ignored)
static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd)
{
struct moxa_port *ch;
struct tty_struct *tty;
unsigned int card;
int i;
dcd = !!dcd;
del_timer(&moxaTimer);
if ((dcd != p->DCDState) && p->tty && C_CLOCAL(p->tty)) {
if (!dcd) {
tty_hangup(p->tty);
p->asyncflags &= ~ASYNC_NORMAL_ACTIVE;
}
wake_up_interruptible(&p->open_wait);
}
p->DCDState = dcd;
}
if (MoxaDriverPoll() < 0) {
mod_timer(&moxaTimer, jiffies + HZ / 50);
return;
static int moxa_poll_port(struct moxa_port *p, unsigned int handle,
u16 __iomem *ip)
{
struct tty_struct *tty = p->tty;
void __iomem *ofsAddr;
unsigned int inited = p->asyncflags & ASYNC_INITIALIZED;
u16 intr;
if (tty) {
if ((p->statusflags & EMPTYWAIT) &&
MoxaPortTxQueue(p) == 0) {
p->statusflags &= ~EMPTYWAIT;
tty_wakeup(tty);
}
if ((p->statusflags & LOWWAIT) && !tty->stopped &&
MoxaPortTxQueue(p) <= WAKEUP_CHARS) {
p->statusflags &= ~LOWWAIT;
tty_wakeup(tty);
}
if (inited && !(p->statusflags & THROTTLE) &&
MoxaPortRxQueue(p) > 0) { /* RX */
MoxaPortReadData(p);
tty_schedule_flip(tty);
}
} else {
p->statusflags &= ~EMPTYWAIT;
MoxaPortFlushData(p, 0); /* flush RX */
}
if (!handle) /* nothing else to do */
return 0;
intr = readw(ip); /* port irq status */
if (intr == 0)
return 0;
writew(0, ip); /* ACK port */
ofsAddr = p->tableAddr;
if (intr & IntrTx) /* disable tx intr */
writew(readw(ofsAddr + HostStat) & ~WakeupTx,
ofsAddr + HostStat);
if (!inited)
return 0;
if (tty && (intr & IntrBreak) && !I_IGNBRK(tty)) { /* BREAK */
tty_insert_flip_char(tty, 0, TTY_BREAK);
tty_schedule_flip(tty);
}
if (intr & IntrLine)
moxa_new_dcdstate(p, readb(ofsAddr + FlagStat) & DCD_state);
return 0;
}
static void moxa_poll(unsigned long ignored)
{
struct moxa_board_conf *brd;
u16 __iomem *ip;
unsigned int card, port;
spin_lock(&moxa_lock);
for (card = 0; card < MAX_BOARDS; card++) {
if (!moxa_boards[card].ready)
brd = &moxa_boards[card];
if (!brd->ready)
continue;
ch = moxa_boards[card].ports;
for (i = 0; i < moxa_boards[card].numPorts; i++, ch++) {
if ((ch->asyncflags & ASYNC_INITIALIZED) == 0)
continue;
if (!(ch->statusflags & THROTTLE) &&
(MoxaPortRxQueue(ch) > 0))
moxa_receive_data(ch);
tty = ch->tty;
if (tty == NULL)
continue;
if (ch->statusflags & LOWWAIT) {
if (MoxaPortTxQueue(ch) <= WAKEUP_CHARS) {
if (!tty->stopped) {
ch->statusflags &= ~LOWWAIT;
tty_wakeup(tty);
}
}
}
if (!I_IGNBRK(tty) && (MoxaPortResetBrkCnt(ch) > 0)) {
tty_insert_flip_char(tty, 0, TTY_BREAK);
tty_schedule_flip(tty);
}
if (MoxaPortDCDChange(ch)) {
if (ch->asyncflags & ASYNC_CHECK_CD) {
if (MoxaPortDCDON(ch))
wake_up_interruptible(&ch->open_wait);
else {
tty_hangup(tty);
wake_up_interruptible(&ch->open_wait);
ch->asyncflags &= ~ASYNC_NORMAL_ACTIVE;
}
ip = NULL;
if (readb(brd->intPend) == 0xff)
ip = brd->intTable + readb(brd->intNdx);
for (port = 0; port < brd->numPorts; port++)
moxa_poll_port(&brd->ports[port], !!ip, ip + port);
if (ip)
writeb(0, brd->intPend); /* ACK */
if (moxaLowWaterChk) {
struct moxa_port *p = brd->ports;
for (port = 0; port < brd->numPorts; port++, p++)
if (p->lowChkFlag) {
p->lowChkFlag = 0;
moxa_low_water_check(p->tableAddr);
}
}
}
}
moxaLowWaterChk = 0;
spin_unlock(&moxa_lock);
mod_timer(&moxaTimer, jiffies + HZ / 50);
}
......@@ -1426,10 +1475,6 @@ static void moxa_set_tty_param(struct tty_struct *tty, struct ktermios *old_term
ch = (struct moxa_port *) tty->driver_data;
ts = tty->termios;
if (ts->c_cflag & CLOCAL)
ch->asyncflags &= ~ASYNC_CHECK_CD;
else
ch->asyncflags |= ASYNC_CHECK_CD;
rts = cts = txflow = rxflow = xany = 0;
if (ts->c_cflag & CRTSCTS)
rts = cts = 1;
......@@ -1454,7 +1499,6 @@ static int moxa_block_till_ready(struct tty_struct *tty, struct file *filp,
struct moxa_port *ch)
{
DECLARE_WAITQUEUE(wait,current);
unsigned long flags;
int retval;
int do_clocal = C_CLOCAL(tty);
......@@ -1489,11 +1533,11 @@ static int moxa_block_till_ready(struct tty_struct *tty, struct file *filp,
add_wait_queue(&ch->open_wait, &wait);
pr_debug("block_til_ready before block: ttys%d, count = %d\n",
tty->index, ch->count);
spin_lock_irqsave(&moxa_lock, flags);
spin_lock_bh(&moxa_lock);
if (!tty_hung_up_p(filp))
ch->count--;
ch->blocked_open++;
spin_unlock_irqrestore(&moxa_lock, flags);
spin_unlock_bh(&moxa_lock);
while (1) {
set_current_state(TASK_INTERRUPTIBLE);
......@@ -1510,7 +1554,7 @@ static int moxa_block_till_ready(struct tty_struct *tty, struct file *filp,
break;
}
if (!(ch->asyncflags & ASYNC_CLOSING) && (do_clocal ||
MoxaPortDCDON(ch)))
ch->DCDState))
break;
if (signal_pending(current)) {
......@@ -1522,11 +1566,11 @@ static int moxa_block_till_ready(struct tty_struct *tty, struct file *filp,
set_current_state(TASK_RUNNING);
remove_wait_queue(&ch->open_wait, &wait);
spin_lock_irqsave(&moxa_lock, flags);
spin_lock_bh(&moxa_lock);
if (!tty_hung_up_p(filp))
ch->count++;
ch->blocked_open--;
spin_unlock_irqrestore(&moxa_lock, flags);
spin_unlock_bh(&moxa_lock);
pr_debug("block_til_ready after blocking: ttys%d, count = %d\n",
tty->index, ch->count);
if (retval)
......@@ -1539,28 +1583,10 @@ static int moxa_block_till_ready(struct tty_struct *tty, struct file *filp,
static void moxa_setup_empty_event(struct tty_struct *tty)
{
struct moxa_port *ch = tty->driver_data;
unsigned long flags;
spin_lock_irqsave(&moxa_lock, flags);
spin_lock_bh(&moxa_lock);
ch->statusflags |= EMPTYWAIT;
mod_timer(&ch->emptyTimer, jiffies + HZ);
spin_unlock_irqrestore(&moxa_lock, flags);
}
static void moxa_check_xmit_empty(unsigned long data)
{
struct moxa_port *ch;
ch = (struct moxa_port *) data;
if (ch->tty && (ch->statusflags & EMPTYWAIT)) {
if (MoxaPortTxQueue(ch) == 0) {
ch->statusflags &= ~EMPTYWAIT;
tty_wakeup(ch->tty);
return;
}
mod_timer(&ch->emptyTimer, round_jiffies(jiffies + HZ));
} else
ch->statusflags &= ~EMPTYWAIT;
spin_unlock_bh(&moxa_lock);
}
static void moxa_shut_down(struct moxa_port *ch)
......@@ -1583,43 +1609,8 @@ static void moxa_shut_down(struct moxa_port *ch)
ch->asyncflags &= ~ASYNC_INITIALIZED;
}
static void moxa_receive_data(struct moxa_port *ch)
{
struct tty_struct *tp;
struct ktermios *ts;
unsigned long flags;
ts = NULL;
tp = ch->tty;
if (tp)
ts = tp->termios;
/**************************************************
if ( !tp || !ts || !(ts->c_cflag & CREAD) ) {
*****************************************************/
if (!tp || !ts) {
MoxaPortFlushData(ch, 0);
return;
}
spin_lock_irqsave(&moxa_lock, flags);
MoxaPortReadData(ch, tp);
spin_unlock_irqrestore(&moxa_lock, flags);
tty_schedule_flip(tp);
}
/*
* Query
*/
#define DCD_changed 0x01
#define DCD_oldstate 0x80
static int moxaLowWaterChk;
static void moxa_low_water_check(void __iomem *);
/*****************************************************************************
* Driver level functions: *
* 3. MoxaDriverPoll(void); *
*****************************************************************************/
static void MoxaPortFlushData(struct moxa_port *port, int mode)
......@@ -1635,67 +1626,6 @@ static void MoxaPortFlushData(struct moxa_port *port, int mode)
}
}
static int MoxaDriverPoll(void)
{
struct moxa_board_conf *brd;
struct moxa_port *p;
void __iomem *ofsAddr;
void __iomem *ip;
unsigned int port, ports, card;
ushort temp;
for (card = 0; card < MAX_BOARDS; card++) {
brd = &moxa_boards[card];
if (brd->ready == 0)
continue;
if ((ports = brd->numPorts) == 0)
continue;
if (readb(brd->intPend) == 0xff) {
ip = brd->intTable + readb(brd->intNdx);
p = brd->ports;
ports <<= 1;
for (port = 0; port < ports; port += 2, p++) {
temp = readw(ip + port);
if (temp == 0)
continue;
writew(0, ip + port);
ofsAddr = p->tableAddr;
if (temp & IntrTx)
writew(readw(ofsAddr + HostStat) &
~WakeupTx, ofsAddr + HostStat);
if (temp & IntrBreak)
p->breakCnt++;
if (temp & IntrLine) {
if (readb(ofsAddr + FlagStat) & DCD_state) {
if ((p->DCDState & DCD_oldstate) == 0)
p->DCDState = (DCD_oldstate |
DCD_changed);
} else {
if (p->DCDState & DCD_oldstate)
p->DCDState = DCD_changed;
}
}
}
writeb(0, brd->intPend);
}
if (moxaLowWaterChk) {
p = brd->ports;
for (port = 0; port < ports; port++, p++) {
if (p->lowChkFlag) {
p->lowChkFlag = 0;
ofsAddr = p->tableAddr;
moxa_low_water_check(ofsAddr);
}
}
}
}
moxaLowWaterChk = 0;
return 0;
}
/*****************************************************************************
* Port level functions: *
* 2. MoxaPortEnable(int port); *
......@@ -1707,8 +1637,6 @@ static int MoxaDriverPoll(void)
* 10. MoxaPortLineCtrl(int port, int dtrState, int rtsState); *
* 11. MoxaPortFlowCtrl(int port, int rts, int cts, int rx, int tx,int xany); *
* 12. MoxaPortLineStatus(int port); *
* 13. MoxaPortDCDChange(int port); *
* 14. MoxaPortDCDON(int port); *
* 15. MoxaPortFlushData(int port, int mode); *
* 16. MoxaPortWriteData(int port, unsigned char * buffer, int length); *
* 17. MoxaPortReadData(int port, struct tty_struct *tty); *
......@@ -1755,14 +1683,6 @@ static int MoxaDriverPoll(void)
* -ENOIOCTLCMD
*
*
* Function 3: Moxa driver polling process routine.
* Syntax:
* int MoxaDriverPoll(void);
*
* return: 0 ; polling O.K.
* -1 : no any Moxa card.
*
*
* Function 6: Enable this port to start Tx/Rx data.
* Syntax:
* void MoxaPortEnable(int port);
......@@ -1853,25 +1773,6 @@ static int MoxaDriverPoll(void)
* Bit 2 - DCD state (0: off, 1: on)
*
*
* Function 17: Check the DCD state has changed since the last read
* of this function.
* Syntax:
* int MoxaPortDCDChange(int port);
* int port : port number (0 - 127)
*
* return: 0 : no changed
* 1 : DCD has changed
*
*
* Function 18: Check ths current DCD state is ON or not.
* Syntax:
* int MoxaPortDCDON(int port);
* int port : port number (0 - 127)
*
* return: 0 : DCD off
* 1 : DCD on
*
*
* Function 19: Flush the Rx/Tx buffer data of this port.
* Syntax:
* void MoxaPortFlushData(int port, int mode);
......@@ -1954,7 +1855,6 @@ static void MoxaPortEnable(struct moxa_port *port)
ofsAddr = port->tableAddr;
writew(lowwater, ofsAddr + Low_water);
port->breakCnt = 0;
if (port->board->boardType == MOXA_BOARD_C320_ISA ||
port->board->boardType == MOXA_BOARD_C320_PCI) {
moxafunc(ofsAddr, FC_SetBreakIrq, 0);
......@@ -2123,37 +2023,11 @@ static int MoxaPortLineStatus(struct moxa_port *port)
val = readw(ofsAddr + FlagStat) >> 4;
}
val &= 0x0B;
if (val & 8) {
if (val & 8)
val |= 4;
if ((port->DCDState & DCD_oldstate) == 0)
port->DCDState = (DCD_oldstate | DCD_changed);
} else {
if (port->DCDState & DCD_oldstate)
port->DCDState = DCD_changed;
}
moxa_new_dcdstate(port, val & 8);
val &= 7;
return (val);
}
static int MoxaPortDCDChange(struct moxa_port *port)
{
int n;
n = port->DCDState;
port->DCDState &= ~DCD_changed;
n &= DCD_changed;
return (n);
}
static int MoxaPortDCDON(struct moxa_port *port)
{
int n;
if (port->DCDState & DCD_oldstate)
n = 1;
else
n = 0;
return (n);
return val;
}
static int MoxaPortWriteData(struct moxa_port *port, unsigned char *buffer,
......@@ -2221,8 +2095,9 @@ static int MoxaPortWriteData(struct moxa_port *port, unsigned char *buffer,
return (total);
}
static int MoxaPortReadData(struct moxa_port *port, struct tty_struct *tty)
static int MoxaPortReadData(struct moxa_port *port)
{
struct tty_struct *tty = port->tty;
register ushort head, pageofs;
int i, count, cnt, len, total, remain;
ushort tail, rx_mask, spage, epage;
......@@ -2243,7 +2118,7 @@ static int MoxaPortReadData(struct moxa_port *port, struct tty_struct *tty)
total = count;
remain = count - total;
moxaLog.rxcnt[port->tty->index] += total;
moxaLog.rxcnt[tty->index] += total;
count = total;
if (spage == epage) {
bufhead = readw(ofsAddr + Ofs_rxb);
......@@ -2341,15 +2216,6 @@ static void MoxaPortTxEnable(struct moxa_port *port)
moxafunc(port->tableAddr, FC_SetXonState, Magic_code);
}
static int MoxaPortResetBrkCnt(struct moxa_port *port)
{
ushort cnt;
cnt = port->breakCnt;
port->breakCnt = 0;
return (cnt);
}
static int moxa_get_serial_info(struct moxa_port *info,
struct serial_struct __user *retinfo)
{
......@@ -2413,21 +2279,6 @@ static int moxa_set_serial_info(struct moxa_port *info,
* Static local functions: *
*****************************************************************************/
static void moxa_low_water_check(void __iomem *ofsAddr)
{
int len;
ushort rptr, wptr, mask;
if (readb(ofsAddr + FlagStat) & Xoff_state) {
rptr = readw(ofsAddr + RXrptr);
wptr = readw(ofsAddr + RXwptr);
mask = readw(ofsAddr + RX_mask);
len = (wptr - rptr) & mask;
if (len <= Low_water)
moxafunc(ofsAddr, FC_SendXon, 0);
}
}
static void MoxaSetFifo(struct moxa_port *port, int enable)
{
void __iomem *ofsAddr = port->tableAddr;
......
drivers/char/moxa.h
View file @ 7bcf97d1
......@@ -165,11 +165,11 @@
#define HostStat 0x08 /* IRQ flag and general flag */
#define FlagStat 0x0A
#define FlowControl 0x0C /* B7 B6 B5 B4 B3 B2 B1 B0 */
/* x x x x | | | | */
/* | | | + CTS flow */
/* | | +--- RTS flow */
/* | +------ TX Xon/Xoff */
/* +--------- RX Xon/Xoff */
/* x x x x | | | | */
/* | | | + CTS flow */
/* | | +--- RTS flow */
/* | +------ TX Xon/Xoff */
/* +--------- RX Xon/Xoff */
#define Break_cnt 0x0E /* received break count */
#define CD180TXirq 0x10 /* if non-0: enable TX irq */
#define RX_mask 0x12
......
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