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/*
* drivers / serial / netx - serial . c
*
* Copyright ( c ) 2005 Sascha Hauer < s . hauer @ pengutronix . de > , Pengutronix
*
* This program is free software ; you can redistribute it and / or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation .
*
* This program is distributed in the hope that it will be useful ,
* but WITHOUT ANY WARRANTY ; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE . See the
* GNU General Public License for more details .
*
* You should have received a copy of the GNU General Public License
* along with this program ; if not , write to the Free Software
* Foundation , Inc . , 59 Temple Place , Suite 330 , Boston , MA 02111 - 1307 USA
*/
# if defined(CONFIG_SERIAL_NETX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
# define SUPPORT_SYSRQ
# endif
# include <linux/device.h>
# include <linux/module.h>
# include <linux/ioport.h>
# include <linux/init.h>
# include <linux/console.h>
# include <linux/sysrq.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 <asm/io.h>
# include <asm/irq.h>
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# include <mach/hardware.h>
# include <mach/netx-regs.h>
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/* We've been assigned a range on the "Low-density serial ports" major */
# define SERIAL_NX_MAJOR 204
# define MINOR_START 170
enum uart_regs {
UART_DR = 0x00 ,
UART_SR = 0x04 ,
UART_LINE_CR = 0x08 ,
UART_BAUDDIV_MSB = 0x0c ,
UART_BAUDDIV_LSB = 0x10 ,
UART_CR = 0x14 ,
UART_FR = 0x18 ,
UART_IIR = 0x1c ,
UART_ILPR = 0x20 ,
UART_RTS_CR = 0x24 ,
UART_RTS_LEAD = 0x28 ,
UART_RTS_TRAIL = 0x2c ,
UART_DRV_ENABLE = 0x30 ,
UART_BRM_CR = 0x34 ,
UART_RXFIFO_IRQLEVEL = 0x38 ,
UART_TXFIFO_IRQLEVEL = 0x3c ,
} ;
# define SR_FE (1<<0)
# define SR_PE (1<<1)
# define SR_BE (1<<2)
# define SR_OE (1<<3)
# define LINE_CR_BRK (1<<0)
# define LINE_CR_PEN (1<<1)
# define LINE_CR_EPS (1<<2)
# define LINE_CR_STP2 (1<<3)
# define LINE_CR_FEN (1<<4)
# define LINE_CR_5BIT (0<<5)
# define LINE_CR_6BIT (1<<5)
# define LINE_CR_7BIT (2<<5)
# define LINE_CR_8BIT (3<<5)
# define LINE_CR_BITS_MASK (3<<5)
# define CR_UART_EN (1<<0)
# define CR_SIREN (1<<1)
# define CR_SIRLP (1<<2)
# define CR_MSIE (1<<3)
# define CR_RIE (1<<4)
# define CR_TIE (1<<5)
# define CR_RTIE (1<<6)
# define CR_LBE (1<<7)
# define FR_CTS (1<<0)
# define FR_DSR (1<<1)
# define FR_DCD (1<<2)
# define FR_BUSY (1<<3)
# define FR_RXFE (1<<4)
# define FR_TXFF (1<<5)
# define FR_RXFF (1<<6)
# define FR_TXFE (1<<7)
# define IIR_MIS (1<<0)
# define IIR_RIS (1<<1)
# define IIR_TIS (1<<2)
# define IIR_RTIS (1<<3)
# define IIR_MASK 0xf
# define RTS_CR_AUTO (1<<0)
# define RTS_CR_RTS (1<<1)
# define RTS_CR_COUNT (1<<2)
# define RTS_CR_MOD2 (1<<3)
# define RTS_CR_RTS_POL (1<<4)
# define RTS_CR_CTS_CTR (1<<5)
# define RTS_CR_CTS_POL (1<<6)
# define RTS_CR_STICK (1<<7)
# define UART_PORT_SIZE 0x40
# define DRIVER_NAME "netx-uart"
struct netx_port {
struct uart_port port ;
} ;
static void netx_stop_tx ( struct uart_port * port )
{
unsigned int val ;
val = readl ( port - > membase + UART_CR ) ;
writel ( val & ~ CR_TIE , port - > membase + UART_CR ) ;
}
static void netx_stop_rx ( struct uart_port * port )
{
unsigned int val ;
val = readl ( port - > membase + UART_CR ) ;
writel ( val & ~ CR_RIE , port - > membase + UART_CR ) ;
}
static void netx_enable_ms ( struct uart_port * port )
{
unsigned int val ;
val = readl ( port - > membase + UART_CR ) ;
writel ( val | CR_MSIE , port - > membase + UART_CR ) ;
}
static inline void netx_transmit_buffer ( struct uart_port * port )
{
struct circ_buf * xmit = & port - > info - > xmit ;
if ( port - > x_char ) {
writel ( port - > x_char , port - > membase + UART_DR ) ;
port - > icount . tx + + ;
port - > x_char = 0 ;
return ;
}
if ( uart_tx_stopped ( port ) | | uart_circ_empty ( xmit ) ) {
netx_stop_tx ( port ) ;
return ;
}
do {
/* send xmit->buf[xmit->tail]
* out the port here */
writel ( xmit - > buf [ xmit - > tail ] , port - > membase + UART_DR ) ;
xmit - > tail = ( xmit - > tail + 1 ) &
( UART_XMIT_SIZE - 1 ) ;
port - > icount . tx + + ;
if ( uart_circ_empty ( xmit ) )
break ;
} while ( ! ( readl ( port - > membase + UART_FR ) & FR_TXFF ) ) ;
if ( uart_circ_empty ( xmit ) )
netx_stop_tx ( port ) ;
}
static void netx_start_tx ( struct uart_port * port )
{
writel (
readl ( port - > membase + UART_CR ) | CR_TIE , port - > membase + UART_CR ) ;
if ( ! ( readl ( port - > membase + UART_FR ) & FR_TXFF ) )
netx_transmit_buffer ( port ) ;
}
static unsigned int netx_tx_empty ( struct uart_port * port )
{
return readl ( port - > membase + UART_FR ) & FR_BUSY ? 0 : TIOCSER_TEMT ;
}
static void netx_txint ( struct uart_port * port )
{
struct circ_buf * xmit = & port - > info - > xmit ;
if ( uart_circ_empty ( xmit ) | | uart_tx_stopped ( port ) ) {
netx_stop_tx ( port ) ;
return ;
}
netx_transmit_buffer ( port ) ;
if ( uart_circ_chars_pending ( xmit ) < WAKEUP_CHARS )
uart_write_wakeup ( port ) ;
}
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 17:55:46 +04:00
static void netx_rxint ( struct uart_port * port )
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{
unsigned char rx , flg , status ;
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struct tty_struct * tty = port - > info - > port . tty ;
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while ( ! ( readl ( port - > membase + UART_FR ) & FR_RXFE ) ) {
rx = readl ( port - > membase + UART_DR ) ;
flg = TTY_NORMAL ;
port - > icount . rx + + ;
status = readl ( port - > membase + UART_SR ) ;
if ( status & SR_BE ) {
writel ( 0 , port - > membase + UART_SR ) ;
if ( uart_handle_break ( port ) )
continue ;
}
if ( unlikely ( status & ( SR_FE | SR_PE | SR_OE ) ) ) {
if ( status & SR_PE )
port - > icount . parity + + ;
else if ( status & SR_FE )
port - > icount . frame + + ;
if ( status & SR_OE )
port - > icount . overrun + + ;
status & = port - > read_status_mask ;
if ( status & SR_BE )
flg = TTY_BREAK ;
else if ( status & SR_PE )
flg = TTY_PARITY ;
else if ( status & SR_FE )
flg = TTY_FRAME ;
}
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 17:55:46 +04:00
if ( uart_handle_sysrq_char ( port , rx ) )
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continue ;
uart_insert_char ( port , status , SR_OE , rx , flg ) ;
}
tty_flip_buffer_push ( tty ) ;
return ;
}
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 17:55:46 +04:00
static irqreturn_t netx_int ( int irq , void * dev_id )
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{
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struct uart_port * port = dev_id ;
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unsigned long flags ;
unsigned char status ;
spin_lock_irqsave ( & port - > lock , flags ) ;
status = readl ( port - > membase + UART_IIR ) & IIR_MASK ;
while ( status ) {
if ( status & IIR_RIS )
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 17:55:46 +04:00
netx_rxint ( port ) ;
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if ( status & IIR_TIS )
netx_txint ( port ) ;
if ( status & IIR_MIS ) {
if ( readl ( port - > membase + UART_FR ) & FR_CTS )
uart_handle_cts_change ( port , 1 ) ;
else
uart_handle_cts_change ( port , 0 ) ;
}
writel ( 0 , port - > membase + UART_IIR ) ;
status = readl ( port - > membase + UART_IIR ) & IIR_MASK ;
}
spin_unlock_irqrestore ( & port - > lock , flags ) ;
return IRQ_HANDLED ;
}
static unsigned int netx_get_mctrl ( struct uart_port * port )
{
unsigned int ret = TIOCM_DSR | TIOCM_CAR ;
if ( readl ( port - > membase + UART_FR ) & FR_CTS )
ret | = TIOCM_CTS ;
return ret ;
}
static void netx_set_mctrl ( struct uart_port * port , unsigned int mctrl )
{
unsigned int val ;
2008-04-30 11:53:59 +04:00
/* FIXME: Locking needed ? */
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if ( mctrl & TIOCM_RTS ) {
val = readl ( port - > membase + UART_RTS_CR ) ;
writel ( val | RTS_CR_RTS , port - > membase + UART_RTS_CR ) ;
}
}
static void netx_break_ctl ( struct uart_port * port , int break_state )
{
unsigned int line_cr ;
spin_lock_irq ( & port - > lock ) ;
line_cr = readl ( port - > membase + UART_LINE_CR ) ;
if ( break_state ! = 0 )
line_cr | = LINE_CR_BRK ;
else
line_cr & = ~ LINE_CR_BRK ;
writel ( line_cr , port - > membase + UART_LINE_CR ) ;
spin_unlock_irq ( & port - > lock ) ;
}
static int netx_startup ( struct uart_port * port )
{
int ret ;
ret = request_irq ( port - > irq , netx_int , 0 ,
DRIVER_NAME , port ) ;
if ( ret ) {
dev_err ( port - > dev , " unable to grab irq%d \n " , port - > irq ) ;
goto exit ;
}
writel ( readl ( port - > membase + UART_LINE_CR ) | LINE_CR_FEN ,
port - > membase + UART_LINE_CR ) ;
writel ( CR_MSIE | CR_RIE | CR_TIE | CR_RTIE | CR_UART_EN ,
port - > membase + UART_CR ) ;
exit :
return ret ;
}
static void netx_shutdown ( struct uart_port * port )
{
writel ( 0 , port - > membase + UART_CR ) ;
free_irq ( port - > irq , port ) ;
}
static void
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netx_set_termios ( struct uart_port * port , struct ktermios * termios ,
struct ktermios * old )
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{
unsigned int baud , quot ;
unsigned char old_cr ;
unsigned char line_cr = LINE_CR_FEN ;
unsigned char rts_cr = 0 ;
switch ( termios - > c_cflag & CSIZE ) {
case CS5 :
line_cr | = LINE_CR_5BIT ;
break ;
case CS6 :
line_cr | = LINE_CR_6BIT ;
break ;
case CS7 :
line_cr | = LINE_CR_7BIT ;
break ;
case CS8 :
line_cr | = LINE_CR_8BIT ;
break ;
}
if ( termios - > c_cflag & CSTOPB )
line_cr | = LINE_CR_STP2 ;
if ( termios - > c_cflag & PARENB ) {
line_cr | = LINE_CR_PEN ;
if ( ! ( termios - > c_cflag & PARODD ) )
line_cr | = LINE_CR_EPS ;
}
if ( termios - > c_cflag & CRTSCTS )
rts_cr = RTS_CR_AUTO | RTS_CR_CTS_CTR | RTS_CR_RTS_POL ;
baud = uart_get_baud_rate ( port , termios , old , 0 , port - > uartclk / 16 ) ;
quot = baud * 4096 ;
quot / = 1000 ;
quot * = 256 ;
quot / = 100000 ;
spin_lock_irq ( & port - > lock ) ;
uart_update_timeout ( port , termios - > c_cflag , baud ) ;
old_cr = readl ( port - > membase + UART_CR ) ;
/* disable interrupts */
writel ( old_cr & ~ ( CR_MSIE | CR_RIE | CR_TIE | CR_RTIE ) ,
port - > membase + UART_CR ) ;
/* drain transmitter */
while ( readl ( port - > membase + UART_FR ) & FR_BUSY ) ;
/* disable UART */
writel ( old_cr & ~ CR_UART_EN , port - > membase + UART_CR ) ;
/* modem status interrupts */
old_cr & = ~ CR_MSIE ;
if ( UART_ENABLE_MS ( port , termios - > c_cflag ) )
old_cr | = CR_MSIE ;
writel ( ( quot > > 8 ) & 0xff , port - > membase + UART_BAUDDIV_MSB ) ;
writel ( quot & 0xff , port - > membase + UART_BAUDDIV_LSB ) ;
writel ( line_cr , port - > membase + UART_LINE_CR ) ;
writel ( rts_cr , port - > membase + UART_RTS_CR ) ;
/*
* Characters to ignore
*/
port - > ignore_status_mask = 0 ;
if ( termios - > c_iflag & IGNPAR )
port - > ignore_status_mask | = SR_PE ;
if ( termios - > c_iflag & IGNBRK ) {
port - > ignore_status_mask | = SR_BE ;
/*
* If we ' re ignoring parity and break indicators ,
* ignore overruns too ( for real raw support ) .
*/
if ( termios - > c_iflag & IGNPAR )
port - > ignore_status_mask | = SR_PE ;
}
port - > read_status_mask = 0 ;
if ( termios - > c_iflag & ( BRKINT | PARMRK ) )
port - > read_status_mask | = SR_BE ;
if ( termios - > c_iflag & INPCK )
port - > read_status_mask | = SR_PE | SR_FE ;
writel ( old_cr , port - > membase + UART_CR ) ;
spin_unlock_irq ( & port - > lock ) ;
}
static const char * netx_type ( struct uart_port * port )
{
return port - > type = = PORT_NETX ? " NETX " : NULL ;
}
static void netx_release_port ( struct uart_port * port )
{
release_mem_region ( port - > mapbase , UART_PORT_SIZE ) ;
}
static int netx_request_port ( struct uart_port * port )
{
return request_mem_region ( port - > mapbase , UART_PORT_SIZE ,
DRIVER_NAME ) ! = NULL ? 0 : - EBUSY ;
}
static void netx_config_port ( struct uart_port * port , int flags )
{
if ( flags & UART_CONFIG_TYPE & & netx_request_port ( port ) = = 0 )
port - > type = PORT_NETX ;
}
static int
netx_verify_port ( struct uart_port * port , struct serial_struct * ser )
{
int ret = 0 ;
if ( ser - > type ! = PORT_UNKNOWN & & ser - > type ! = PORT_NETX )
ret = - EINVAL ;
return ret ;
}
static struct uart_ops netx_pops = {
. tx_empty = netx_tx_empty ,
. set_mctrl = netx_set_mctrl ,
. get_mctrl = netx_get_mctrl ,
. stop_tx = netx_stop_tx ,
. start_tx = netx_start_tx ,
. stop_rx = netx_stop_rx ,
. enable_ms = netx_enable_ms ,
. break_ctl = netx_break_ctl ,
. startup = netx_startup ,
. shutdown = netx_shutdown ,
. set_termios = netx_set_termios ,
. type = netx_type ,
. release_port = netx_release_port ,
. request_port = netx_request_port ,
. config_port = netx_config_port ,
. verify_port = netx_verify_port ,
} ;
static struct netx_port netx_ports [ ] = {
{
. port = {
. type = PORT_NETX ,
. iotype = UPIO_MEM ,
. membase = ( char __iomem * ) io_p2v ( NETX_PA_UART0 ) ,
. mapbase = NETX_PA_UART0 ,
. irq = NETX_IRQ_UART0 ,
. uartclk = 100000000 ,
. fifosize = 16 ,
. flags = UPF_BOOT_AUTOCONF ,
. ops = & netx_pops ,
. line = 0 ,
} ,
} , {
. port = {
. type = PORT_NETX ,
. iotype = UPIO_MEM ,
. membase = ( char __iomem * ) io_p2v ( NETX_PA_UART1 ) ,
. mapbase = NETX_PA_UART1 ,
. irq = NETX_IRQ_UART1 ,
. uartclk = 100000000 ,
. fifosize = 16 ,
. flags = UPF_BOOT_AUTOCONF ,
. ops = & netx_pops ,
. line = 1 ,
} ,
} , {
. port = {
. type = PORT_NETX ,
. iotype = UPIO_MEM ,
. membase = ( char __iomem * ) io_p2v ( NETX_PA_UART2 ) ,
. mapbase = NETX_PA_UART2 ,
. irq = NETX_IRQ_UART2 ,
. uartclk = 100000000 ,
. fifosize = 16 ,
. flags = UPF_BOOT_AUTOCONF ,
. ops = & netx_pops ,
. line = 2 ,
} ,
}
} ;
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# ifdef CONFIG_SERIAL_NETX_CONSOLE
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static void netx_console_putchar ( struct uart_port * port , int ch )
{
while ( readl ( port - > membase + UART_FR ) & FR_BUSY ) ;
writel ( ch , port - > membase + UART_DR ) ;
}
static void
netx_console_write ( struct console * co , const char * s , unsigned int count )
{
struct uart_port * port = & netx_ports [ co - > index ] . port ;
unsigned char cr_save ;
cr_save = readl ( port - > membase + UART_CR ) ;
writel ( cr_save | CR_UART_EN , port - > membase + UART_CR ) ;
uart_console_write ( port , s , count , netx_console_putchar ) ;
while ( readl ( port - > membase + UART_FR ) & FR_BUSY ) ;
writel ( cr_save , port - > membase + UART_CR ) ;
}
static void __init
netx_console_get_options ( struct uart_port * port , int * baud ,
int * parity , int * bits , int * flow )
{
unsigned char line_cr ;
* baud = ( readl ( port - > membase + UART_BAUDDIV_MSB ) < < 8 ) |
readl ( port - > membase + UART_BAUDDIV_LSB ) ;
* baud * = 1000 ;
* baud / = 4096 ;
* baud * = 1000 ;
* baud / = 256 ;
* baud * = 100 ;
line_cr = readl ( port - > membase + UART_LINE_CR ) ;
* parity = ' n ' ;
if ( line_cr & LINE_CR_PEN ) {
if ( line_cr & LINE_CR_EPS )
* parity = ' e ' ;
else
* parity = ' o ' ;
}
switch ( line_cr & LINE_CR_BITS_MASK ) {
case LINE_CR_8BIT :
* bits = 8 ;
break ;
case LINE_CR_7BIT :
* bits = 7 ;
break ;
case LINE_CR_6BIT :
* bits = 6 ;
break ;
case LINE_CR_5BIT :
* bits = 5 ;
break ;
}
if ( readl ( port - > membase + UART_RTS_CR ) & RTS_CR_AUTO )
* flow = ' r ' ;
}
static int __init
netx_console_setup ( struct console * co , char * options )
{
struct netx_port * sport ;
int baud = 9600 ;
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 > = ARRAY_SIZE ( netx_ports ) )
co - > index = 0 ;
sport = & netx_ports [ co - > index ] ;
if ( options ) {
uart_parse_options ( options , & baud , & parity , & bits , & flow ) ;
} else {
/* if the UART is enabled, assume it has been correctly setup
* by the bootloader and get the options
*/
if ( readl ( sport - > port . membase + UART_CR ) & CR_UART_EN ) {
netx_console_get_options ( & sport - > port , & baud ,
& parity , & bits , & flow ) ;
}
}
return uart_set_options ( & sport - > port , co , baud , parity , bits , flow ) ;
}
static struct uart_driver netx_reg ;
static struct console netx_console = {
. name = " ttyNX " ,
. write = netx_console_write ,
. device = uart_console_device ,
. setup = netx_console_setup ,
. flags = CON_PRINTBUFFER ,
. index = - 1 ,
. data = & netx_reg ,
} ;
static int __init netx_console_init ( void )
{
register_console ( & netx_console ) ;
return 0 ;
}
console_initcall ( netx_console_init ) ;
# define NETX_CONSOLE &netx_console
# else
# define NETX_CONSOLE NULL
# endif
static struct uart_driver netx_reg = {
. owner = THIS_MODULE ,
. driver_name = DRIVER_NAME ,
. dev_name = " ttyNX " ,
. major = SERIAL_NX_MAJOR ,
. minor = MINOR_START ,
. nr = ARRAY_SIZE ( netx_ports ) ,
. cons = NETX_CONSOLE ,
} ;
static int serial_netx_suspend ( struct platform_device * pdev , pm_message_t state )
{
struct netx_port * sport = platform_get_drvdata ( pdev ) ;
if ( sport )
uart_suspend_port ( & netx_reg , & sport - > port ) ;
return 0 ;
}
static int serial_netx_resume ( struct platform_device * pdev )
{
struct netx_port * sport = platform_get_drvdata ( pdev ) ;
if ( sport )
uart_resume_port ( & netx_reg , & sport - > port ) ;
return 0 ;
}
static int serial_netx_probe ( struct platform_device * pdev )
{
struct uart_port * port = & netx_ports [ pdev - > id ] . port ;
dev_info ( & pdev - > dev , " initialising \n " ) ;
port - > dev = & pdev - > dev ;
writel ( 1 , port - > membase + UART_RXFIFO_IRQLEVEL ) ;
uart_add_one_port ( & netx_reg , & netx_ports [ pdev - > id ] . port ) ;
platform_set_drvdata ( pdev , & netx_ports [ pdev - > id ] ) ;
return 0 ;
}
static int serial_netx_remove ( struct platform_device * pdev )
{
struct netx_port * sport = platform_get_drvdata ( pdev ) ;
platform_set_drvdata ( pdev , NULL ) ;
if ( sport )
uart_remove_one_port ( & netx_reg , & sport - > port ) ;
return 0 ;
}
static struct platform_driver serial_netx_driver = {
. probe = serial_netx_probe ,
. remove = serial_netx_remove ,
. suspend = serial_netx_suspend ,
. resume = serial_netx_resume ,
. driver = {
. name = DRIVER_NAME ,
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. owner = THIS_MODULE ,
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} ,
} ;
static int __init netx_serial_init ( void )
{
int ret ;
printk ( KERN_INFO " Serial: NetX driver \n " ) ;
ret = uart_register_driver ( & netx_reg ) ;
if ( ret )
return ret ;
ret = platform_driver_register ( & serial_netx_driver ) ;
if ( ret ! = 0 )
uart_unregister_driver ( & netx_reg ) ;
return 0 ;
}
static void __exit netx_serial_exit ( void )
{
platform_driver_unregister ( & serial_netx_driver ) ;
uart_unregister_driver ( & netx_reg ) ;
}
module_init ( netx_serial_init ) ;
module_exit ( netx_serial_exit ) ;
MODULE_AUTHOR ( " Sascha Hauer " ) ;
MODULE_DESCRIPTION ( " NetX serial port driver " ) ;
MODULE_LICENSE ( " GPL " ) ;
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MODULE_ALIAS ( " platform: " DRIVER_NAME ) ;
