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alistair23-linux/drivers/tty/serial/pnx8xxx_uart.c
Kees Cook e99e88a9d2 treewide: setup_timer() -> timer_setup() 
This converts all remaining cases of the old setup_timer() API into using
timer_setup(), where the callback argument is the structure already
holding the struct timer_list. These should have no behavioral changes,
since they just change which pointer is passed into the callback with
the same available pointers after conversion. It handles the following
examples, in addition to some other variations.

Casting from unsigned long:

    void my_callback(unsigned long data)
    {
        struct something *ptr = (struct something *)data;
    ...
    }
    ...
    setup_timer(&ptr->my_timer, my_callback, ptr);

and forced object casts:

    void my_callback(struct something *ptr)
    {
    ...
    }
    ...
    setup_timer(&ptr->my_timer, my_callback, (unsigned long)ptr);

become:

    void my_callback(struct timer_list *t)
    {
        struct something *ptr = from_timer(ptr, t, my_timer);
    ...
    }
    ...
    timer_setup(&ptr->my_timer, my_callback, 0);

Direct function assignments:

    void my_callback(unsigned long data)
    {
        struct something *ptr = (struct something *)data;
    ...
    }
    ...
    ptr->my_timer.function = my_callback;

have a temporary cast added, along with converting the args:

    void my_callback(struct timer_list *t)
    {
        struct something *ptr = from_timer(ptr, t, my_timer);
    ...
    }
    ...
    ptr->my_timer.function = (TIMER_FUNC_TYPE)my_callback;

And finally, callbacks without a data assignment:

    void my_callback(unsigned long data)
    {
    ...
    }
    ...
    setup_timer(&ptr->my_timer, my_callback, 0);

have their argument renamed to verify they're unused during conversion:

    void my_callback(struct timer_list *unused)
    {
    ...
    }
    ...
    timer_setup(&ptr->my_timer, my_callback, 0);

The conversion is done with the following Coccinelle script:

spatch --very-quiet --all-includes --include-headers \
	-I ./arch/x86/include -I ./arch/x86/include/generated \
	-I ./include -I ./arch/x86/include/uapi \
	-I ./arch/x86/include/generated/uapi -I ./include/uapi \
	-I ./include/generated/uapi --include ./include/linux/kconfig.h \
	--dir . \
	--cocci-file ~/src/data/timer_setup.cocci

@fix_address_of@
expression e;
@@

 setup_timer(
-&(e)
+&e
 , ...)

// Update any raw setup_timer() usages that have a NULL callback, but
// would otherwise match change_timer_function_usage, since the latter
// will update all function assignments done in the face of a NULL
// function initialization in setup_timer().
@change_timer_function_usage_NULL@
expression _E;
identifier _timer;
type _cast_data;
@@

(
-setup_timer(&_E->_timer, NULL, _E);
+timer_setup(&_E->_timer, NULL, 0);
|
-setup_timer(&_E->_timer, NULL, (_cast_data)_E);
+timer_setup(&_E->_timer, NULL, 0);
|
-setup_timer(&_E._timer, NULL, &_E);
+timer_setup(&_E._timer, NULL, 0);
|
-setup_timer(&_E._timer, NULL, (_cast_data)&_E);
+timer_setup(&_E._timer, NULL, 0);
)

@change_timer_function_usage@
expression _E;
identifier _timer;
struct timer_list _stl;
identifier _callback;
type _cast_func, _cast_data;
@@

(
-setup_timer(&_E->_timer, _callback, _E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, &_callback, _E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, _callback, (_cast_data)_E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, &_callback, (_cast_data)_E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, (_cast_func)_callback, _E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, (_cast_func)&_callback, _E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, (_cast_func)_callback, (_cast_data)_E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, (_cast_func)&_callback, (_cast_data)_E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, (_cast_data)_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, (_cast_data)&_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, &_callback, (_cast_data)_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, &_callback, (_cast_data)&_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, (_cast_func)_callback, (_cast_data)_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, (_cast_func)_callback, (_cast_data)&_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, (_cast_func)&_callback, (_cast_data)_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, (_cast_func)&_callback, (_cast_data)&_E);
+timer_setup(&_E._timer, _callback, 0);
|
 _E->_timer@_stl.function = _callback;
|
 _E->_timer@_stl.function = &_callback;
|
 _E->_timer@_stl.function = (_cast_func)_callback;
|
 _E->_timer@_stl.function = (_cast_func)&_callback;
|
 _E._timer@_stl.function = _callback;
|
 _E._timer@_stl.function = &_callback;
|
 _E._timer@_stl.function = (_cast_func)_callback;
|
 _E._timer@_stl.function = (_cast_func)&_callback;
)

// callback(unsigned long arg)
@change_callback_handle_cast
 depends on change_timer_function_usage@
identifier change_timer_function_usage._callback;
identifier change_timer_function_usage._timer;
type _origtype;
identifier _origarg;
type _handletype;
identifier _handle;
@@

 void _callback(
-_origtype _origarg
+struct timer_list *t
 )
 {
(
	... when != _origarg
	_handletype *_handle =
-(_handletype *)_origarg;
+from_timer(_handle, t, _timer);
	... when != _origarg
|
	... when != _origarg
	_handletype *_handle =
-(void *)_origarg;
+from_timer(_handle, t, _timer);
	... when != _origarg
|
	... when != _origarg
	_handletype *_handle;
	... when != _handle
	_handle =
-(_handletype *)_origarg;
+from_timer(_handle, t, _timer);
	... when != _origarg
|
	... when != _origarg
	_handletype *_handle;
	... when != _handle
	_handle =
-(void *)_origarg;
+from_timer(_handle, t, _timer);
	... when != _origarg
)
 }

// callback(unsigned long arg) without existing variable
@change_callback_handle_cast_no_arg
 depends on change_timer_function_usage &&
                     !change_callback_handle_cast@
identifier change_timer_function_usage._callback;
identifier change_timer_function_usage._timer;
type _origtype;
identifier _origarg;
type _handletype;
@@

 void _callback(
-_origtype _origarg
+struct timer_list *t
 )
 {
+	_handletype *_origarg = from_timer(_origarg, t, _timer);
+
	... when != _origarg
-	(_handletype *)_origarg
+	_origarg
	... when != _origarg
 }

// Avoid already converted callbacks.
@match_callback_converted
 depends on change_timer_function_usage &&
            !change_callback_handle_cast &&
	    !change_callback_handle_cast_no_arg@
identifier change_timer_function_usage._callback;
identifier t;
@@

 void _callback(struct timer_list *t)
 { ... }

// callback(struct something *handle)
@change_callback_handle_arg
 depends on change_timer_function_usage &&
	    !match_callback_converted &&
            !change_callback_handle_cast &&
            !change_callback_handle_cast_no_arg@
identifier change_timer_function_usage._callback;
identifier change_timer_function_usage._timer;
type _handletype;
identifier _handle;
@@

 void _callback(
-_handletype *_handle
+struct timer_list *t
 )
 {
+	_handletype *_handle = from_timer(_handle, t, _timer);
	...
 }

// If change_callback_handle_arg ran on an empty function, remove
// the added handler.
@unchange_callback_handle_arg
 depends on change_timer_function_usage &&
	    change_callback_handle_arg@
identifier change_timer_function_usage._callback;
identifier change_timer_function_usage._timer;
type _handletype;
identifier _handle;
identifier t;
@@

 void _callback(struct timer_list *t)
 {
-	_handletype *_handle = from_timer(_handle, t, _timer);
 }

// We only want to refactor the setup_timer() data argument if we've found
// the matching callback. This undoes changes in change_timer_function_usage.
@unchange_timer_function_usage
 depends on change_timer_function_usage &&
            !change_callback_handle_cast &&
            !change_callback_handle_cast_no_arg &&
	    !change_callback_handle_arg@
expression change_timer_function_usage._E;
identifier change_timer_function_usage._timer;
identifier change_timer_function_usage._callback;
type change_timer_function_usage._cast_data;
@@

(
-timer_setup(&_E->_timer, _callback, 0);
+setup_timer(&_E->_timer, _callback, (_cast_data)_E);
|
-timer_setup(&_E._timer, _callback, 0);
+setup_timer(&_E._timer, _callback, (_cast_data)&_E);
)

// If we fixed a callback from a .function assignment, fix the
// assignment cast now.
@change_timer_function_assignment
 depends on change_timer_function_usage &&
            (change_callback_handle_cast ||
             change_callback_handle_cast_no_arg ||
             change_callback_handle_arg)@
expression change_timer_function_usage._E;
identifier change_timer_function_usage._timer;
identifier change_timer_function_usage._callback;
type _cast_func;
typedef TIMER_FUNC_TYPE;
@@

(
 _E->_timer.function =
-_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E->_timer.function =
-&_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E->_timer.function =
-(_cast_func)_callback;
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E->_timer.function =
-(_cast_func)&_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E._timer.function =
-_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E._timer.function =
-&_callback;
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E._timer.function =
-(_cast_func)_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E._timer.function =
-(_cast_func)&_callback
+(TIMER_FUNC_TYPE)_callback
 ;
)

// Sometimes timer functions are called directly. Replace matched args.
@change_timer_function_calls
 depends on change_timer_function_usage &&
            (change_callback_handle_cast ||
             change_callback_handle_cast_no_arg ||
             change_callback_handle_arg)@
expression _E;
identifier change_timer_function_usage._timer;
identifier change_timer_function_usage._callback;
type _cast_data;
@@

 _callback(
(
-(_cast_data)_E
+&_E->_timer
|
-(_cast_data)&_E
+&_E._timer
|
-_E
+&_E->_timer
)
 )

// If a timer has been configured without a data argument, it can be
// converted without regard to the callback argument, since it is unused.
@match_timer_function_unused_data@
expression _E;
identifier _timer;
identifier _callback;
@@

(
-setup_timer(&_E->_timer, _callback, 0);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, _callback, 0L);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, _callback, 0UL);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, 0);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, 0L);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, 0UL);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_timer, _callback, 0);
+timer_setup(&_timer, _callback, 0);
|
-setup_timer(&_timer, _callback, 0L);
+timer_setup(&_timer, _callback, 0);
|
-setup_timer(&_timer, _callback, 0UL);
+timer_setup(&_timer, _callback, 0);
|
-setup_timer(_timer, _callback, 0);
+timer_setup(_timer, _callback, 0);
|
-setup_timer(_timer, _callback, 0L);
+timer_setup(_timer, _callback, 0);
|
-setup_timer(_timer, _callback, 0UL);
+timer_setup(_timer, _callback, 0);
)

@change_callback_unused_data
 depends on match_timer_function_unused_data@
identifier match_timer_function_unused_data._callback;
type _origtype;
identifier _origarg;
@@

 void _callback(
-_origtype _origarg
+struct timer_list *unused
 )
 {
	... when != _origarg
 }

Signed-off-by: Kees Cook <keescook@chromium.org>
2017-11-21 15:57:07 -08:00

864 lines
21 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0
/*
* UART driver for PNX8XXX SoCs
*
* Author: Per Hallsmark per.hallsmark@mvista.com
* Ported to 2.6 kernel by EmbeddedAlley
* Reworked by Vitaly Wool <vitalywool@gmail.com>
*
* Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
* Copyright (C) 2000 Deep Blue Solutions Ltd.
*/
#if defined(CONFIG_SERIAL_PNX8XXX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/sysrq.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
#include <linux/serial.h>
#include <linux/serial_pnx8xxx.h>
#include <asm/io.h>
#include <asm/irq.h>
/* We'll be using StrongARM sa1100 serial port major/minor */
#define SERIAL_PNX8XXX_MAJOR 204
#define MINOR_START 5
#define NR_PORTS 2
#define PNX8XXX_ISR_PASS_LIMIT 256
/*
* Convert from ignore_status_mask or read_status_mask to FIFO
* and interrupt status bits
*/
#define SM_TO_FIFO(x) ((x) >> 10)
#define SM_TO_ISTAT(x) ((x) & 0x000001ff)
#define FIFO_TO_SM(x) ((x) << 10)
#define ISTAT_TO_SM(x) ((x) & 0x000001ff)
/*
* This is the size of our serial port register set.
*/
#define UART_PORT_SIZE 0x1000
/*
* This determines how often we check the modem status signals
* for any change. They generally aren't connected to an IRQ
* so we have to poll them. We also check immediately before
* filling the TX fifo incase CTS has been dropped.
*/
#define MCTRL_TIMEOUT (250*HZ/1000)
extern struct pnx8xxx_port pnx8xxx_ports[];
static inline int serial_in(struct pnx8xxx_port *sport, int offset)
{
return (__raw_readl(sport->port.membase + offset));
}
static inline void serial_out(struct pnx8xxx_port *sport, int offset, int value)
{
__raw_writel(value, sport->port.membase + offset);
}
/*
* Handle any change of modem status signal since we were last called.
*/
static void pnx8xxx_mctrl_check(struct pnx8xxx_port *sport)
{
unsigned int status, changed;
status = sport->port.ops->get_mctrl(&sport->port);
changed = status ^ sport->old_status;
if (changed == 0)
return;
sport->old_status = status;
if (changed & TIOCM_RI)
sport->port.icount.rng++;
if (changed & TIOCM_DSR)
sport->port.icount.dsr++;
if (changed & TIOCM_CAR)
uart_handle_dcd_change(&sport->port, status & TIOCM_CAR);
if (changed & TIOCM_CTS)
uart_handle_cts_change(&sport->port, status & TIOCM_CTS);
wake_up_interruptible(&sport->port.state->port.delta_msr_wait);
}
/*
* This is our per-port timeout handler, for checking the
* modem status signals.
*/
static void pnx8xxx_timeout(struct timer_list *t)
{
struct pnx8xxx_port *sport = from_timer(sport, t, timer);
unsigned long flags;
if (sport->port.state) {
spin_lock_irqsave(&sport->port.lock, flags);
pnx8xxx_mctrl_check(sport);
spin_unlock_irqrestore(&sport->port.lock, flags);
mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT);
}
}
/*
* interrupts disabled on entry
*/
static void pnx8xxx_stop_tx(struct uart_port *port)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
u32 ien;
/* Disable TX intr */
ien = serial_in(sport, PNX8XXX_IEN);
serial_out(sport, PNX8XXX_IEN, ien & ~PNX8XXX_UART_INT_ALLTX);
/* Clear all pending TX intr */
serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLTX);
}
/*
* interrupts may not be disabled on entry
*/
static void pnx8xxx_start_tx(struct uart_port *port)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
u32 ien;
/* Clear all pending TX intr */
serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLTX);
/* Enable TX intr */
ien = serial_in(sport, PNX8XXX_IEN);
serial_out(sport, PNX8XXX_IEN, ien | PNX8XXX_UART_INT_ALLTX);
}
/*
* Interrupts enabled
*/
static void pnx8xxx_stop_rx(struct uart_port *port)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
u32 ien;
/* Disable RX intr */
ien = serial_in(sport, PNX8XXX_IEN);
serial_out(sport, PNX8XXX_IEN, ien & ~PNX8XXX_UART_INT_ALLRX);
/* Clear all pending RX intr */
serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLRX);
}
/*
* Set the modem control timer to fire immediately.
*/
static void pnx8xxx_enable_ms(struct uart_port *port)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
mod_timer(&sport->timer, jiffies);
}
static void pnx8xxx_rx_chars(struct pnx8xxx_port *sport)
{
unsigned int status, ch, flg;
status = FIFO_TO_SM(serial_in(sport, PNX8XXX_FIFO)) |
ISTAT_TO_SM(serial_in(sport, PNX8XXX_ISTAT));
while (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFIFO)) {
ch = serial_in(sport, PNX8XXX_FIFO) & 0xff;
sport->port.icount.rx++;
flg = TTY_NORMAL;
/*
* note that the error handling code is
* out of the main execution path
*/
if (status & (FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE |
PNX8XXX_UART_FIFO_RXPAR |
PNX8XXX_UART_FIFO_RXBRK) |
ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN))) {
if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXBRK)) {
status &= ~(FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE) |
FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR));
sport->port.icount.brk++;
if (uart_handle_break(&sport->port))
goto ignore_char;
} else if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR))
sport->port.icount.parity++;
else if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE))
sport->port.icount.frame++;
if (status & ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN))
sport->port.icount.overrun++;
status &= sport->port.read_status_mask;
if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR))
flg = TTY_PARITY;
else if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE))
flg = TTY_FRAME;
#ifdef SUPPORT_SYSRQ
sport->port.sysrq = 0;
#endif
}
if (uart_handle_sysrq_char(&sport->port, ch))
goto ignore_char;
uart_insert_char(&sport->port, status,
ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN), ch, flg);
ignore_char:
serial_out(sport, PNX8XXX_LCR, serial_in(sport, PNX8XXX_LCR) |
PNX8XXX_UART_LCR_RX_NEXT);
status = FIFO_TO_SM(serial_in(sport, PNX8XXX_FIFO)) |
ISTAT_TO_SM(serial_in(sport, PNX8XXX_ISTAT));
}
spin_unlock(&sport->port.lock);
tty_flip_buffer_push(&sport->port.state->port);
spin_lock(&sport->port.lock);
}
static void pnx8xxx_tx_chars(struct pnx8xxx_port *sport)
{
struct circ_buf *xmit = &sport->port.state->xmit;
if (sport->port.x_char) {
serial_out(sport, PNX8XXX_FIFO, sport->port.x_char);
sport->port.icount.tx++;
sport->port.x_char = 0;
return;
}
/*
* Check the modem control lines before
* transmitting anything.
*/
pnx8xxx_mctrl_check(sport);
if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
pnx8xxx_stop_tx(&sport->port);
return;
}
/*
* TX while bytes available
*/
while (((serial_in(sport, PNX8XXX_FIFO) &
PNX8XXX_UART_FIFO_TXFIFO) >> 16) < 16) {
serial_out(sport, PNX8XXX_FIFO, xmit->buf[xmit->tail]);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
sport->port.icount.tx++;
if (uart_circ_empty(xmit))
break;
}
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&sport->port);
if (uart_circ_empty(xmit))
pnx8xxx_stop_tx(&sport->port);
}
static irqreturn_t pnx8xxx_int(int irq, void *dev_id)
{
struct pnx8xxx_port *sport = dev_id;
unsigned int status;
spin_lock(&sport->port.lock);
/* Get the interrupts */
status = serial_in(sport, PNX8XXX_ISTAT) & serial_in(sport, PNX8XXX_IEN);
/* Byte or break signal received */
if (status & (PNX8XXX_UART_INT_RX | PNX8XXX_UART_INT_BREAK))
pnx8xxx_rx_chars(sport);
/* TX holding register empty - transmit a byte */
if (status & PNX8XXX_UART_INT_TX)
pnx8xxx_tx_chars(sport);
/* Clear the ISTAT register */
serial_out(sport, PNX8XXX_ICLR, status);
spin_unlock(&sport->port.lock);
return IRQ_HANDLED;
}
/*
* Return TIOCSER_TEMT when transmitter is not busy.
*/
static unsigned int pnx8xxx_tx_empty(struct uart_port *port)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
return serial_in(sport, PNX8XXX_FIFO) & PNX8XXX_UART_FIFO_TXFIFO_STA ? 0 : TIOCSER_TEMT;
}
static unsigned int pnx8xxx_get_mctrl(struct uart_port *port)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
unsigned int mctrl = TIOCM_DSR;
unsigned int msr;
/* REVISIT */
msr = serial_in(sport, PNX8XXX_MCR);
mctrl |= msr & PNX8XXX_UART_MCR_CTS ? TIOCM_CTS : 0;
mctrl |= msr & PNX8XXX_UART_MCR_DCD ? TIOCM_CAR : 0;
return mctrl;
}
static void pnx8xxx_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
#if 0 /* FIXME */
struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
unsigned int msr;
#endif
}
/*
* Interrupts always disabled.
*/
static void pnx8xxx_break_ctl(struct uart_port *port, int break_state)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
unsigned long flags;
unsigned int lcr;
spin_lock_irqsave(&sport->port.lock, flags);
lcr = serial_in(sport, PNX8XXX_LCR);
if (break_state == -1)
lcr |= PNX8XXX_UART_LCR_TXBREAK;
else
lcr &= ~PNX8XXX_UART_LCR_TXBREAK;
serial_out(sport, PNX8XXX_LCR, lcr);
spin_unlock_irqrestore(&sport->port.lock, flags);
}
static int pnx8xxx_startup(struct uart_port *port)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
int retval;
/*
* Allocate the IRQ
*/
retval = request_irq(sport->port.irq, pnx8xxx_int, 0,
"pnx8xxx-uart", sport);
if (retval)
return retval;
/*
* Finally, clear and enable interrupts
*/
serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLRX |
PNX8XXX_UART_INT_ALLTX);
serial_out(sport, PNX8XXX_IEN, serial_in(sport, PNX8XXX_IEN) |
PNX8XXX_UART_INT_ALLRX |
PNX8XXX_UART_INT_ALLTX);
/*
* Enable modem status interrupts
*/
spin_lock_irq(&sport->port.lock);
pnx8xxx_enable_ms(&sport->port);
spin_unlock_irq(&sport->port.lock);
return 0;
}
static void pnx8xxx_shutdown(struct uart_port *port)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
int lcr;
/*
* Stop our timer.
*/
del_timer_sync(&sport->timer);
/*
* Disable all interrupts
*/
serial_out(sport, PNX8XXX_IEN, 0);
/*
* Reset the Tx and Rx FIFOS, disable the break condition
*/
lcr = serial_in(sport, PNX8XXX_LCR);
lcr &= ~PNX8XXX_UART_LCR_TXBREAK;
lcr |= PNX8XXX_UART_LCR_TX_RST | PNX8XXX_UART_LCR_RX_RST;
serial_out(sport, PNX8XXX_LCR, lcr);
/*
* Clear all interrupts
*/
serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLRX |
PNX8XXX_UART_INT_ALLTX);
/*
* Free the interrupt
*/
free_irq(sport->port.irq, sport);
}
static void
pnx8xxx_set_termios(struct uart_port *port, struct ktermios *termios,
struct ktermios *old)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
unsigned long flags;
unsigned int lcr_fcr, old_ien, baud, quot;
unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
/*
* We only support CS7 and CS8.
*/
while ((termios->c_cflag & CSIZE) != CS7 &&
(termios->c_cflag & CSIZE) != CS8) {
termios->c_cflag &= ~CSIZE;
termios->c_cflag |= old_csize;
old_csize = CS8;
}
if ((termios->c_cflag & CSIZE) == CS8)
lcr_fcr = PNX8XXX_UART_LCR_8BIT;
else
lcr_fcr = 0;
if (termios->c_cflag & CSTOPB)
lcr_fcr |= PNX8XXX_UART_LCR_2STOPB;
if (termios->c_cflag & PARENB) {
lcr_fcr |= PNX8XXX_UART_LCR_PAREN;
if (!(termios->c_cflag & PARODD))
lcr_fcr |= PNX8XXX_UART_LCR_PAREVN;
}
/*
* Ask the core to calculate the divisor for us.
*/
baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
quot = uart_get_divisor(port, baud);
spin_lock_irqsave(&sport->port.lock, flags);
sport->port.read_status_mask = ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN) |
ISTAT_TO_SM(PNX8XXX_UART_INT_EMPTY) |
ISTAT_TO_SM(PNX8XXX_UART_INT_RX);
if (termios->c_iflag & INPCK)
sport->port.read_status_mask |=
FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE) |
FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR);
if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
sport->port.read_status_mask |=
ISTAT_TO_SM(PNX8XXX_UART_INT_BREAK);
/*
* Characters to ignore
*/
sport->port.ignore_status_mask = 0;
if (termios->c_iflag & IGNPAR)
sport->port.ignore_status_mask |=
FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE) |
FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR);
if (termios->c_iflag & IGNBRK) {
sport->port.ignore_status_mask |=
ISTAT_TO_SM(PNX8XXX_UART_INT_BREAK);
/*
* If we're ignoring parity and break indicators,
* ignore overruns too (for real raw support).
*/
if (termios->c_iflag & IGNPAR)
sport->port.ignore_status_mask |=
ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN);
}
/*
* ignore all characters if CREAD is not set
*/
if ((termios->c_cflag & CREAD) == 0)
sport->port.ignore_status_mask |=
ISTAT_TO_SM(PNX8XXX_UART_INT_RX);
del_timer_sync(&sport->timer);
/*
* Update the per-port timeout.
*/
uart_update_timeout(port, termios->c_cflag, baud);
/*
* disable interrupts and drain transmitter
*/
old_ien = serial_in(sport, PNX8XXX_IEN);
serial_out(sport, PNX8XXX_IEN, old_ien & ~(PNX8XXX_UART_INT_ALLTX |
PNX8XXX_UART_INT_ALLRX));
while (serial_in(sport, PNX8XXX_FIFO) & PNX8XXX_UART_FIFO_TXFIFO_STA)
barrier();
/* then, disable everything */
serial_out(sport, PNX8XXX_IEN, 0);
/* Reset the Rx and Tx FIFOs too */
lcr_fcr |= PNX8XXX_UART_LCR_TX_RST;
lcr_fcr |= PNX8XXX_UART_LCR_RX_RST;
/* set the parity, stop bits and data size */
serial_out(sport, PNX8XXX_LCR, lcr_fcr);
/* set the baud rate */
quot -= 1;
serial_out(sport, PNX8XXX_BAUD, quot);
serial_out(sport, PNX8XXX_ICLR, -1);
serial_out(sport, PNX8XXX_IEN, old_ien);
if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
pnx8xxx_enable_ms(&sport->port);
spin_unlock_irqrestore(&sport->port.lock, flags);
}
static const char *pnx8xxx_type(struct uart_port *port)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
return sport->port.type == PORT_PNX8XXX ? "PNX8XXX" : NULL;
}
/*
* Release the memory region(s) being used by 'port'.
*/
static void pnx8xxx_release_port(struct uart_port *port)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
release_mem_region(sport->port.mapbase, UART_PORT_SIZE);
}
/*
* Request the memory region(s) being used by 'port'.
*/
static int pnx8xxx_request_port(struct uart_port *port)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
return request_mem_region(sport->port.mapbase, UART_PORT_SIZE,
"pnx8xxx-uart") != NULL ? 0 : -EBUSY;
}
/*
* Configure/autoconfigure the port.
*/
static void pnx8xxx_config_port(struct uart_port *port, int flags)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
if (flags & UART_CONFIG_TYPE &&
pnx8xxx_request_port(&sport->port) == 0)
sport->port.type = PORT_PNX8XXX;
}
/*
* Verify the new serial_struct (for TIOCSSERIAL).
* The only change we allow are to the flags and type, and
* even then only between PORT_PNX8XXX and PORT_UNKNOWN
*/
static int
pnx8xxx_verify_port(struct uart_port *port, struct serial_struct *ser)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
int ret = 0;
if (ser->type != PORT_UNKNOWN && ser->type != PORT_PNX8XXX)
ret = -EINVAL;
if (sport->port.irq != ser->irq)
ret = -EINVAL;
if (ser->io_type != SERIAL_IO_MEM)
ret = -EINVAL;
if (sport->port.uartclk / 16 != ser->baud_base)
ret = -EINVAL;
if ((void *)sport->port.mapbase != ser->iomem_base)
ret = -EINVAL;
if (sport->port.iobase != ser->port)
ret = -EINVAL;
if (ser->hub6 != 0)
ret = -EINVAL;
return ret;
}
static const struct uart_ops pnx8xxx_pops = {
.tx_empty = pnx8xxx_tx_empty,
.set_mctrl = pnx8xxx_set_mctrl,
.get_mctrl = pnx8xxx_get_mctrl,
.stop_tx = pnx8xxx_stop_tx,
.start_tx = pnx8xxx_start_tx,
.stop_rx = pnx8xxx_stop_rx,
.enable_ms = pnx8xxx_enable_ms,
.break_ctl = pnx8xxx_break_ctl,
.startup = pnx8xxx_startup,
.shutdown = pnx8xxx_shutdown,
.set_termios = pnx8xxx_set_termios,
.type = pnx8xxx_type,
.release_port = pnx8xxx_release_port,
.request_port = pnx8xxx_request_port,
.config_port = pnx8xxx_config_port,
.verify_port = pnx8xxx_verify_port,
};
/*
* Setup the PNX8XXX serial ports.
*
* Note also that we support "console=ttySx" where "x" is either 0 or 1.
*/
static void __init pnx8xxx_init_ports(void)
{
static int first = 1;
int i;
if (!first)
return;
first = 0;
for (i = 0; i < NR_PORTS; i++) {
timer_setup(&pnx8xxx_ports[i].timer, pnx8xxx_timeout, 0);
pnx8xxx_ports[i].port.ops = &pnx8xxx_pops;
}
}
#ifdef CONFIG_SERIAL_PNX8XXX_CONSOLE
static void pnx8xxx_console_putchar(struct uart_port *port, int ch)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
int status;
do {
/* Wait for UART_TX register to empty */
status = serial_in(sport, PNX8XXX_FIFO);
} while (status & PNX8XXX_UART_FIFO_TXFIFO);
serial_out(sport, PNX8XXX_FIFO, ch);
}
/*
* Interrupts are disabled on entering
*/static void
pnx8xxx_console_write(struct console *co, const char *s, unsigned int count)
{
struct pnx8xxx_port *sport = &pnx8xxx_ports[co->index];
unsigned int old_ien, status;
/*
* First, save IEN and then disable interrupts
*/
old_ien = serial_in(sport, PNX8XXX_IEN);
serial_out(sport, PNX8XXX_IEN, old_ien & ~(PNX8XXX_UART_INT_ALLTX |
PNX8XXX_UART_INT_ALLRX));
uart_console_write(&sport->port, s, count, pnx8xxx_console_putchar);
/*
* Finally, wait for transmitter to become empty
* and restore IEN
*/
do {
/* Wait for UART_TX register to empty */
status = serial_in(sport, PNX8XXX_FIFO);
} while (status & PNX8XXX_UART_FIFO_TXFIFO);
/* Clear TX and EMPTY interrupt */
serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_TX |
PNX8XXX_UART_INT_EMPTY);
serial_out(sport, PNX8XXX_IEN, old_ien);
}
static int __init
pnx8xxx_console_setup(struct console *co, char *options)
{
struct pnx8xxx_port *sport;
int baud = 38400;
int bits = 8;
int parity = 'n';
int flow = 'n';
/*
* Check whether an invalid uart number has been specified, and
* if so, search for the first available port that does have
* console support.
*/
if (co->index == -1 || co->index >= NR_PORTS)
co->index = 0;
sport = &pnx8xxx_ports[co->index];
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
return uart_set_options(&sport->port, co, baud, parity, bits, flow);
}
static struct uart_driver pnx8xxx_reg;
static struct console pnx8xxx_console = {
.name = "ttyS",
.write = pnx8xxx_console_write,
.device = uart_console_device,
.setup = pnx8xxx_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &pnx8xxx_reg,
};
static int __init pnx8xxx_rs_console_init(void)
{
pnx8xxx_init_ports();
register_console(&pnx8xxx_console);
return 0;
}
console_initcall(pnx8xxx_rs_console_init);
#define PNX8XXX_CONSOLE &pnx8xxx_console
#else
#define PNX8XXX_CONSOLE NULL
#endif
static struct uart_driver pnx8xxx_reg = {
.owner = THIS_MODULE,
.driver_name = "ttyS",
.dev_name = "ttyS",
.major = SERIAL_PNX8XXX_MAJOR,
.minor = MINOR_START,
.nr = NR_PORTS,
.cons = PNX8XXX_CONSOLE,
};
static int pnx8xxx_serial_suspend(struct platform_device *pdev, pm_message_t state)
{
struct pnx8xxx_port *sport = platform_get_drvdata(pdev);
return uart_suspend_port(&pnx8xxx_reg, &sport->port);
}
static int pnx8xxx_serial_resume(struct platform_device *pdev)
{
struct pnx8xxx_port *sport = platform_get_drvdata(pdev);
return uart_resume_port(&pnx8xxx_reg, &sport->port);
}
static int pnx8xxx_serial_probe(struct platform_device *pdev)
{
struct resource *res = pdev->resource;
int i;
for (i = 0; i < pdev->num_resources; i++, res++) {
if (!(res->flags & IORESOURCE_MEM))
continue;
for (i = 0; i < NR_PORTS; i++) {
if (pnx8xxx_ports[i].port.mapbase != res->start)
continue;
pnx8xxx_ports[i].port.dev = &pdev->dev;
uart_add_one_port(&pnx8xxx_reg, &pnx8xxx_ports[i].port);
platform_set_drvdata(pdev, &pnx8xxx_ports[i]);
break;
}
}
return 0;
}
static int pnx8xxx_serial_remove(struct platform_device *pdev)
{
struct pnx8xxx_port *sport = platform_get_drvdata(pdev);
if (sport)
uart_remove_one_port(&pnx8xxx_reg, &sport->port);
return 0;
}
static struct platform_driver pnx8xxx_serial_driver = {
.driver = {
.name = "pnx8xxx-uart",
},
.probe = pnx8xxx_serial_probe,
.remove = pnx8xxx_serial_remove,
.suspend = pnx8xxx_serial_suspend,
.resume = pnx8xxx_serial_resume,
};
static int __init pnx8xxx_serial_init(void)
{
int ret;
printk(KERN_INFO "Serial: PNX8XXX driver\n");
pnx8xxx_init_ports();
ret = uart_register_driver(&pnx8xxx_reg);
if (ret == 0) {
ret = platform_driver_register(&pnx8xxx_serial_driver);
if (ret)
uart_unregister_driver(&pnx8xxx_reg);
}
return ret;
}
static void __exit pnx8xxx_serial_exit(void)
{
platform_driver_unregister(&pnx8xxx_serial_driver);
uart_unregister_driver(&pnx8xxx_reg);
}
module_init(pnx8xxx_serial_init);
module_exit(pnx8xxx_serial_exit);
MODULE_AUTHOR("Embedded Alley Solutions, Inc.");
MODULE_DESCRIPTION("PNX8XXX SoCs serial port driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_PNX8XXX_MAJOR);
MODULE_ALIAS("platform:pnx8xxx-uart");
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