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cyclades: use dtr_rts helpers
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For Z cards, use tty helpers for dtr_rts.

If we did the same for Y cards, it will cause a deadlock, because
cyy_dtr_rts takes a lock which we already hold.

Instead, we introduce a Y helper expecting card lock to be held.
It may then be called with set/clear masks from other places.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Jiri Slaby authored and Live-CD User committed Sep 19, 2009
1 parent f6e208c commit 4d76820
Showing 1 changed file with 79 additions and 201 deletions.
280 changes: 79 additions & 201 deletions drivers/char/cyclades.c
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Original file line number Diff line number Diff line change
Expand Up @@ -825,6 +825,66 @@ static irqreturn_t cyy_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
} /* cyy_interrupt */

static void cyy_change_rts_dtr(struct cyclades_port *info, unsigned int set,
unsigned int clear)
{
struct cyclades_card *card = info->card;
void __iomem *base_addr;
int chip, channel, index;

channel = info->line - card->first_line;
chip = channel >> 2;
channel &= 0x03;
index = card->bus_index;
base_addr = card->base_addr + (cy_chip_offset[chip] << index);

if (set & TIOCM_RTS) {
cy_writeb(base_addr + (CyCAR << index), (u_char) channel);
if (info->rtsdtr_inv) {
cy_writeb(base_addr + (CyMSVR2 << index), CyDTR);
} else {
cy_writeb(base_addr + (CyMSVR1 << index), CyRTS);
}
}
if (clear & TIOCM_RTS) {
cy_writeb(base_addr + (CyCAR << index), (u_char) channel);
if (info->rtsdtr_inv) {
cy_writeb(base_addr + (CyMSVR2 << index), ~CyDTR);
} else {
cy_writeb(base_addr + (CyMSVR1 << index), ~CyRTS);
}
}
if (set & TIOCM_DTR) {
cy_writeb(base_addr + (CyCAR << index), (u_char) channel);
if (info->rtsdtr_inv) {
cy_writeb(base_addr + (CyMSVR1 << index), CyRTS);
} else {
cy_writeb(base_addr + (CyMSVR2 << index), CyDTR);
}
#ifdef CY_DEBUG_DTR
printk(KERN_DEBUG "cyc:set_modem_info raising DTR\n");
printk(KERN_DEBUG " status: 0x%x, 0x%x\n",
readb(base_addr + (CyMSVR1 << index)),
readb(base_addr + (CyMSVR2 << index)));
#endif
}
if (clear & TIOCM_DTR) {
cy_writeb(base_addr + (CyCAR << index), (u_char) channel);
if (info->rtsdtr_inv) {
cy_writeb(base_addr + (CyMSVR1 << index), ~CyRTS);
} else {
cy_writeb(base_addr + (CyMSVR2 << index), ~CyDTR);
}

#ifdef CY_DEBUG_DTR
printk(KERN_DEBUG "cyc:set_modem_info dropping DTR\n");
printk(KERN_DEBUG " status: 0x%x, 0x%x\n",
readb(base_addr + (CyMSVR1 << index)),
readb(base_addr + (CyMSVR2 << index)));
#endif
}
}

/***********************************************************/
/********* End of block of Cyclom-Y specific code **********/
/******** Start of block of Cyclades-Z specific code *******/
Expand Down Expand Up @@ -1290,16 +1350,7 @@ static int cy_startup(struct cyclades_port *info, struct tty_struct *tty)
cyy_issue_cmd(base_addr, CyCHAN_CTL | CyENB_RCVR | CyENB_XMTR,
index);

cy_writeb(base_addr + (CyCAR << index), (u_char) channel);
cy_writeb(base_addr + (CyMSVR1 << index), CyRTS);
cy_writeb(base_addr + (CyMSVR2 << index), CyDTR);

#ifdef CY_DEBUG_DTR
printk(KERN_DEBUG "cyc:startup raising DTR\n");
printk(KERN_DEBUG " status: 0x%x, 0x%x\n",
readb(base_addr + (CyMSVR1 << index)),
readb(base_addr + (CyMSVR2 << index)));
#endif
cyy_change_rts_dtr(info, TIOCM_RTS | TIOCM_DTR, 0);

cy_writeb(base_addr + (CySRER << index),
readb(base_addr + (CySRER << index)) | CyRxData);
Expand Down Expand Up @@ -1362,16 +1413,7 @@ static int cy_startup(struct cyclades_port *info, struct tty_struct *tty)

/* set timeout !!! */
/* set RTS and DTR !!! */
cy_writel(&ch_ctrl->rs_control, readl(&ch_ctrl->rs_control) |
C_RS_RTS | C_RS_DTR);
retval = cyz_issue_cmd(card, channel, C_CM_IOCTLM, 0L);
if (retval != 0) {
printk(KERN_ERR "cyc:startup(3) retval on ttyC%d was "
"%x\n", info->line, retval);
}
#ifdef CY_DEBUG_DTR
printk(KERN_DEBUG "cyc:startup raising Z DTR\n");
#endif
tty_port_raise_dtr_rts(&info->port);

/* enable send, recv, modem !!! */

Expand Down Expand Up @@ -1473,17 +1515,9 @@ static void cy_shutdown(struct cyclades_port *info, struct tty_struct *tty)
info->port.xmit_buf = NULL;
free_page((unsigned long)temp);
}
cy_writeb(base_addr + (CyCAR << index), (u_char) channel);
if (tty->termios->c_cflag & HUPCL) {
cy_writeb(base_addr + (CyMSVR1 << index), ~CyRTS);
cy_writeb(base_addr + (CyMSVR2 << index), ~CyDTR);
#ifdef CY_DEBUG_DTR
printk(KERN_DEBUG "cyc shutdown dropping DTR\n");
printk(KERN_DEBUG " status: 0x%x, 0x%x\n",
readb(base_addr + (CyMSVR1 << index)),
readb(base_addr + (CyMSVR2 << index)));
#endif
}
if (tty->termios->c_cflag & HUPCL)
cyy_change_rts_dtr(info, 0, TIOCM_RTS | TIOCM_DTR);

cyy_issue_cmd(base_addr, CyCHAN_CTL | CyDIS_RCVR, index);
/* it may be appropriate to clear _XMIT at
some later date (after testing)!!! */
Expand All @@ -1492,9 +1526,6 @@ static void cy_shutdown(struct cyclades_port *info, struct tty_struct *tty)
info->port.flags &= ~ASYNC_INITIALIZED;
spin_unlock_irqrestore(&card->card_lock, flags);
} else {
struct CH_CTRL __iomem *ch_ctrl = info->u.cyz.ch_ctrl;
int retval;

#ifdef CY_DEBUG_OPEN
printk(KERN_DEBUG "cyc shutdown Z card %d, channel %d, "
"base_addr %p\n", card, channel, card->base_addr);
Expand All @@ -1512,20 +1543,8 @@ static void cy_shutdown(struct cyclades_port *info, struct tty_struct *tty)
free_page((unsigned long)temp);
}

if (tty->termios->c_cflag & HUPCL) {
cy_writel(&ch_ctrl->rs_control,
readl(&ch_ctrl->rs_control) &
~(C_RS_RTS | C_RS_DTR));
retval = cyz_issue_cmd(info->card, channel,
C_CM_IOCTLM, 0L);
if (retval != 0) {
printk(KERN_ERR"cyc:shutdown retval on ttyC%d "
"was %x\n", info->line, retval);
}
#ifdef CY_DEBUG_DTR
printk(KERN_DEBUG "cyc:shutdown dropping Z DTR\n");
#endif
}
if (tty->termios->c_cflag & HUPCL)
tty_port_lower_dtr_rts(&info->port);

set_bit(TTY_IO_ERROR, &tty->flags);
info->port.flags &= ~ASYNC_INITIALIZED;
Expand Down Expand Up @@ -2273,35 +2292,10 @@ static void cy_set_line_char(struct cyclades_port *info, struct tty_struct *tty)
CyDSR | CyCTS | CyRI | CyDCD);
}

if (i == 0) { /* baud rate is zero, turn off line */
if (info->rtsdtr_inv) {
cy_writeb(base_addr + (CyMSVR1 << index),
~CyRTS);
} else {
cy_writeb(base_addr + (CyMSVR2 << index),
~CyDTR);
}
#ifdef CY_DEBUG_DTR
printk(KERN_DEBUG "cyc:set_line_char dropping DTR\n");
printk(KERN_DEBUG " status: 0x%x, 0x%x\n",
readb(base_addr + (CyMSVR1 << index)),
readb(base_addr + (CyMSVR2 << index)));
#endif
} else {
if (info->rtsdtr_inv) {
cy_writeb(base_addr + (CyMSVR1 << index),
CyRTS);
} else {
cy_writeb(base_addr + (CyMSVR2 << index),
CyDTR);
}
#ifdef CY_DEBUG_DTR
printk(KERN_DEBUG "cyc:set_line_char raising DTR\n");
printk(KERN_DEBUG " status: 0x%x, 0x%x\n",
readb(base_addr + (CyMSVR1 << index)),
readb(base_addr + (CyMSVR2 << index)));
#endif
}
if (i == 0) /* baud rate is zero, turn off line */
cyy_change_rts_dtr(info, 0, TIOCM_DTR);
else
cyy_change_rts_dtr(info, TIOCM_DTR, 0);

clear_bit(TTY_IO_ERROR, &tty->flags);
spin_unlock_irqrestore(&card->card_lock, flags);
Expand Down Expand Up @@ -2604,87 +2598,18 @@ cy_tiocmset(struct tty_struct *tty, struct file *file,
{
struct cyclades_port *info = tty->driver_data;
struct cyclades_card *card;
int chip, channel, index;
unsigned long flags;
int retval;
int channel, retval;

if (serial_paranoia_check(info, tty->name, __func__))
return -ENODEV;

card = info->card;
channel = (info->line) - (card->first_line);
if (!cy_is_Z(card)) {
void __iomem *base_addr;
chip = channel >> 2;
channel &= 0x03;
index = card->bus_index;
base_addr = card->base_addr + (cy_chip_offset[chip] << index);

if (set & TIOCM_RTS) {
spin_lock_irqsave(&card->card_lock, flags);
cy_writeb(base_addr + (CyCAR << index),
(u_char) channel);
if (info->rtsdtr_inv) {
cy_writeb(base_addr + (CyMSVR2 << index),
CyDTR);
} else {
cy_writeb(base_addr + (CyMSVR1 << index),
CyRTS);
}
spin_unlock_irqrestore(&card->card_lock, flags);
}
if (clear & TIOCM_RTS) {
spin_lock_irqsave(&card->card_lock, flags);
cy_writeb(base_addr + (CyCAR << index),
(u_char) channel);
if (info->rtsdtr_inv) {
cy_writeb(base_addr + (CyMSVR2 << index),
~CyDTR);
} else {
cy_writeb(base_addr + (CyMSVR1 << index),
~CyRTS);
}
spin_unlock_irqrestore(&card->card_lock, flags);
}
if (set & TIOCM_DTR) {
spin_lock_irqsave(&card->card_lock, flags);
cy_writeb(base_addr + (CyCAR << index),
(u_char) channel);
if (info->rtsdtr_inv) {
cy_writeb(base_addr + (CyMSVR1 << index),
CyRTS);
} else {
cy_writeb(base_addr + (CyMSVR2 << index),
CyDTR);
}
#ifdef CY_DEBUG_DTR
printk(KERN_DEBUG "cyc:set_modem_info raising DTR\n");
printk(KERN_DEBUG " status: 0x%x, 0x%x\n",
readb(base_addr + (CyMSVR1 << index)),
readb(base_addr + (CyMSVR2 << index)));
#endif
spin_unlock_irqrestore(&card->card_lock, flags);
}
if (clear & TIOCM_DTR) {
spin_lock_irqsave(&card->card_lock, flags);
cy_writeb(base_addr + (CyCAR << index),
(u_char) channel);
if (info->rtsdtr_inv) {
cy_writeb(base_addr + (CyMSVR1 << index),
~CyRTS);
} else {
cy_writeb(base_addr + (CyMSVR2 << index),
~CyDTR);
}

#ifdef CY_DEBUG_DTR
printk(KERN_DEBUG "cyc:set_modem_info dropping DTR\n");
printk(KERN_DEBUG " status: 0x%x, 0x%x\n",
readb(base_addr + (CyMSVR1 << index)),
readb(base_addr + (CyMSVR2 << index)));
#endif
spin_unlock_irqrestore(&card->card_lock, flags);
}
spin_lock_irqsave(&card->card_lock, flags);
cyy_change_rts_dtr(info, set, clear);
spin_unlock_irqrestore(&card->card_lock, flags);
} else {
if (cyz_is_loaded(card)) {
struct CH_CTRL __iomem *ch_ctrl = info->u.cyz.ch_ctrl;
Expand Down Expand Up @@ -3177,8 +3102,6 @@ static void cy_throttle(struct tty_struct *tty)
struct cyclades_port *info = tty->driver_data;
struct cyclades_card *card;
unsigned long flags;
void __iomem *base_addr;
int chip, channel, index;

#ifdef CY_DEBUG_THROTTLE
char buf[64];
Expand All @@ -3200,24 +3123,9 @@ static void cy_throttle(struct tty_struct *tty)
}

if (tty->termios->c_cflag & CRTSCTS) {
channel = info->line - card->first_line;
if (!cy_is_Z(card)) {
chip = channel >> 2;
channel &= 0x03;
index = card->bus_index;
base_addr = card->base_addr +
(cy_chip_offset[chip] << index);

spin_lock_irqsave(&card->card_lock, flags);
cy_writeb(base_addr + (CyCAR << index),
(u_char) channel);
if (info->rtsdtr_inv) {
cy_writeb(base_addr + (CyMSVR2 << index),
~CyDTR);
} else {
cy_writeb(base_addr + (CyMSVR1 << index),
~CyRTS);
}
cyy_change_rts_dtr(info, 0, TIOCM_RTS);
spin_unlock_irqrestore(&card->card_lock, flags);
} else {
info->throttle = 1;
Expand All @@ -3235,8 +3143,6 @@ static void cy_unthrottle(struct tty_struct *tty)
struct cyclades_port *info = tty->driver_data;
struct cyclades_card *card;
unsigned long flags;
void __iomem *base_addr;
int chip, channel, index;

#ifdef CY_DEBUG_THROTTLE
char buf[64];
Expand All @@ -3257,24 +3163,9 @@ static void cy_unthrottle(struct tty_struct *tty)

if (tty->termios->c_cflag & CRTSCTS) {
card = info->card;
channel = info->line - card->first_line;
if (!cy_is_Z(card)) {
chip = channel >> 2;
channel &= 0x03;
index = card->bus_index;
base_addr = card->base_addr +
(cy_chip_offset[chip] << index);

spin_lock_irqsave(&card->card_lock, flags);
cy_writeb(base_addr + (CyCAR << index),
(u_char) channel);
if (info->rtsdtr_inv) {
cy_writeb(base_addr + (CyMSVR2 << index),
CyDTR);
} else {
cy_writeb(base_addr + (CyMSVR1 << index),
CyRTS);
}
cyy_change_rts_dtr(info, TIOCM_RTS, 0);
spin_unlock_irqrestore(&card->card_lock, flags);
} else {
info->throttle = 0;
Expand Down Expand Up @@ -3395,24 +3286,11 @@ static void cyy_dtr_rts(struct tty_port *port, int raise)
struct cyclades_port *info = container_of(port, struct cyclades_port,
port);
struct cyclades_card *cinfo = info->card;
void __iomem *base = cinfo->base_addr;
unsigned long flags;
int channel = info->line - cinfo->first_line;
int chip = channel >> 2, index = cinfo->bus_index;

channel &= 0x03;
base += cy_chip_offset[chip] << index;

spin_lock_irqsave(&cinfo->card_lock, flags);
cy_writeb(base + (CyCAR << index), (u8)channel);
cy_writeb(base + (CyMSVR1 << index), raise ? CyRTS : ~CyRTS);
cy_writeb(base + (CyMSVR2 << index), raise ? CyDTR : ~CyDTR);
#ifdef CY_DEBUG_DTR
printk(KERN_DEBUG "%s: raising DTR\n", __func__);
printk(KERN_DEBUG " status: 0x%x, 0x%x\n",
readb(base + (CyMSVR1 << index)),
readb(base + (CyMSVR2 << index)));
#endif
cyy_change_rts_dtr(info, raise ? TIOCM_RTS | TIOCM_DTR : 0,
raise ? 0 : TIOCM_RTS | TIOCM_DTR);
spin_unlock_irqrestore(&cinfo->card_lock, flags);
}

Expand Down

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