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linux/drivers/serial/vr41xx_siu.c
Alan Cox 33f0f88f1c [PATCH] TTY layer buffering revamp 
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.

This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.

When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.

For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).

Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.

The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.

I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.

Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real.  That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.

Description:

tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification].  It
does now also return the number of chars inserted

There are also

tty_buffer_request_room(tty, len)

which asks for a buffer block of the length requested and returns the space
found.  This improves efficiency with hardware that knows how much to
transfer.

and tty_insert_flip_string_flags(tty, str, flags, len)

to insert a string of characters and flags

For a smart interface the usual code is

    len = tty_request_buffer_room(tty, amount_hardware_says);
    tty_insert_flip_string(tty, buffer_from_card, len);

More description!

At the moment tty buffers are attached directly to the tty.  This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)

I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers.  This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.

So far so good.  Lots of drivers reference tty->flip.*.  Several of them also
call directly and unsafely into function pointers it provides.  This will all
break.  Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.

At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say

 int tty_buffer_request_room(tty, size)

Try and ensure at least size bytes are available, returns actual room (may be
zero).  At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative.  (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space.  The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.

 int tty_insert_flip_char(tty, ch, flag)

As before insert a character if there is room.  Now returns 1 for success, 0
for failure.

 int tty_insert_flip_string(tty, str, len)

Insert a block of non error characters.  Returns the number inserted.

 int tty_prepare_flip_string(tty, strptr, len)

Adjust the buffer to allow len characters to be added.  Returns a buffer
pointer in strptr and the length available.  This allows for hardware that
needs to use functions like insl or mencpy_fromio.

Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 08:01:59 -08:00

1041 lines
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/*
* Driver for NEC VR4100 series Serial Interface Unit.
*
* Copyright (C) 2004-2005 Yoichi Yuasa <yuasa@hh.iij4u.or.jp>
*
* Based on drivers/serial/8250.c, by Russell King.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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
*/
#include <linux/config.h>
#if defined(CONFIG_SERIAL_VR41XX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#include <linux/console.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/serial_reg.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <asm/io.h>
#include <asm/vr41xx/siu.h>
#include <asm/vr41xx/vr41xx.h>
#define SIU_PORTS_MAX 2
#define SIU_BAUD_BASE 1152000
#define SIU_MAJOR 204
#define SIU_MINOR_BASE 82
#define RX_MAX_COUNT 256
#define TX_MAX_COUNT 15
#define SIUIRSEL 0x08
#define TMICMODE 0x20
#define TMICTX 0x10
#define IRMSEL 0x0c
#define IRMSEL_HP 0x08
#define IRMSEL_TEMIC 0x04
#define IRMSEL_SHARP 0x00
#define IRUSESEL 0x02
#define SIRSEL 0x01
struct siu_port {
unsigned int type;
unsigned int irq;
unsigned long start;
};
static const struct siu_port siu_type1_ports[] = {
{ .type = PORT_VR41XX_SIU,
.irq = SIU_IRQ,
.start = 0x0c000000UL, },
};
#define SIU_TYPE1_NR_PORTS (sizeof(siu_type1_ports) / sizeof(struct siu_port))
static const struct siu_port siu_type2_ports[] = {
{ .type = PORT_VR41XX_SIU,
.irq = SIU_IRQ,
.start = 0x0f000800UL, },
{ .type = PORT_VR41XX_DSIU,
.irq = DSIU_IRQ,
.start = 0x0f000820UL, },
};
#define SIU_TYPE2_NR_PORTS (sizeof(siu_type2_ports) / sizeof(struct siu_port))
static struct uart_port siu_uart_ports[SIU_PORTS_MAX];
static uint8_t lsr_break_flag[SIU_PORTS_MAX];
#define siu_read(port, offset) readb((port)->membase + (offset))
#define siu_write(port, offset, value) writeb((value), (port)->membase + (offset))
void vr41xx_select_siu_interface(siu_interface_t interface)
{
struct uart_port *port;
unsigned long flags;
uint8_t irsel;
port = &siu_uart_ports[0];
spin_lock_irqsave(&port->lock, flags);
irsel = siu_read(port, SIUIRSEL);
if (interface == SIU_INTERFACE_IRDA)
irsel |= SIRSEL;
else
irsel &= ~SIRSEL;
siu_write(port, SIUIRSEL, irsel);
spin_unlock_irqrestore(&port->lock, flags);
}
EXPORT_SYMBOL_GPL(vr41xx_select_siu_interface);
void vr41xx_use_irda(irda_use_t use)
{
struct uart_port *port;
unsigned long flags;
uint8_t irsel;
port = &siu_uart_ports[0];
spin_lock_irqsave(&port->lock, flags);
irsel = siu_read(port, SIUIRSEL);
if (use == FIR_USE_IRDA)
irsel |= IRUSESEL;
else
irsel &= ~IRUSESEL;
siu_write(port, SIUIRSEL, irsel);
spin_unlock_irqrestore(&port->lock, flags);
}
EXPORT_SYMBOL_GPL(vr41xx_use_irda);
void vr41xx_select_irda_module(irda_module_t module, irda_speed_t speed)
{
struct uart_port *port;
unsigned long flags;
uint8_t irsel;
port = &siu_uart_ports[0];
spin_lock_irqsave(&port->lock, flags);
irsel = siu_read(port, SIUIRSEL);
irsel &= ~(IRMSEL | TMICTX | TMICMODE);
switch (module) {
case SHARP_IRDA:
irsel |= IRMSEL_SHARP;
break;
case TEMIC_IRDA:
irsel |= IRMSEL_TEMIC | TMICMODE;
if (speed == IRDA_TX_4MBPS)
irsel |= TMICTX;
break;
case HP_IRDA:
irsel |= IRMSEL_HP;
break;
default:
break;
}
siu_write(port, SIUIRSEL, irsel);
spin_unlock_irqrestore(&port->lock, flags);
}
EXPORT_SYMBOL_GPL(vr41xx_select_irda_module);
static inline void siu_clear_fifo(struct uart_port *port)
{
siu_write(port, UART_FCR, UART_FCR_ENABLE_FIFO);
siu_write(port, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
UART_FCR_CLEAR_XMIT);
siu_write(port, UART_FCR, 0);
}
static inline int siu_probe_ports(void)
{
switch (current_cpu_data.cputype) {
case CPU_VR4111:
case CPU_VR4121:
return SIU_TYPE1_NR_PORTS;
case CPU_VR4122:
case CPU_VR4131:
case CPU_VR4133:
return SIU_TYPE2_NR_PORTS;
}
return 0;
}
static inline unsigned long siu_port_size(struct uart_port *port)
{
switch (port->type) {
case PORT_VR41XX_SIU:
return 11UL;
case PORT_VR41XX_DSIU:
return 8UL;
}
return 0;
}
static inline unsigned int siu_check_type(struct uart_port *port)
{
switch (current_cpu_data.cputype) {
case CPU_VR4111:
case CPU_VR4121:
if (port->line == 0)
return PORT_VR41XX_SIU;
break;
case CPU_VR4122:
case CPU_VR4131:
case CPU_VR4133:
if (port->line == 0)
return PORT_VR41XX_SIU;
else if (port->line == 1)
return PORT_VR41XX_DSIU;
break;
}
return PORT_UNKNOWN;
}
static inline const char *siu_type_name(struct uart_port *port)
{
switch (port->type) {
case PORT_VR41XX_SIU:
return "SIU";
case PORT_VR41XX_DSIU:
return "DSIU";
}
return NULL;
}
static unsigned int siu_tx_empty(struct uart_port *port)
{
uint8_t lsr;
lsr = siu_read(port, UART_LSR);
if (lsr & UART_LSR_TEMT)
return TIOCSER_TEMT;
return 0;
}
static void siu_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
uint8_t mcr = 0;
if (mctrl & TIOCM_DTR)
mcr |= UART_MCR_DTR;
if (mctrl & TIOCM_RTS)
mcr |= UART_MCR_RTS;
if (mctrl & TIOCM_OUT1)
mcr |= UART_MCR_OUT1;
if (mctrl & TIOCM_OUT2)
mcr |= UART_MCR_OUT2;
if (mctrl & TIOCM_LOOP)
mcr |= UART_MCR_LOOP;
siu_write(port, UART_MCR, mcr);
}
static unsigned int siu_get_mctrl(struct uart_port *port)
{
uint8_t msr;
unsigned int mctrl = 0;
msr = siu_read(port, UART_MSR);
if (msr & UART_MSR_DCD)
mctrl |= TIOCM_CAR;
if (msr & UART_MSR_RI)
mctrl |= TIOCM_RNG;
if (msr & UART_MSR_DSR)
mctrl |= TIOCM_DSR;
if (msr & UART_MSR_CTS)
mctrl |= TIOCM_CTS;
return mctrl;
}
static void siu_stop_tx(struct uart_port *port)
{
unsigned long flags;
uint8_t ier;
spin_lock_irqsave(&port->lock, flags);
ier = siu_read(port, UART_IER);
ier &= ~UART_IER_THRI;
siu_write(port, UART_IER, ier);
spin_unlock_irqrestore(&port->lock, flags);
}
static void siu_start_tx(struct uart_port *port)
{
unsigned long flags;
uint8_t ier;
spin_lock_irqsave(&port->lock, flags);
ier = siu_read(port, UART_IER);
ier |= UART_IER_THRI;
siu_write(port, UART_IER, ier);
spin_unlock_irqrestore(&port->lock, flags);
}
static void siu_stop_rx(struct uart_port *port)
{
unsigned long flags;
uint8_t ier;
spin_lock_irqsave(&port->lock, flags);
ier = siu_read(port, UART_IER);
ier &= ~UART_IER_RLSI;
siu_write(port, UART_IER, ier);
port->read_status_mask &= ~UART_LSR_DR;
spin_unlock_irqrestore(&port->lock, flags);
}
static void siu_enable_ms(struct uart_port *port)
{
unsigned long flags;
uint8_t ier;
spin_lock_irqsave(&port->lock, flags);
ier = siu_read(port, UART_IER);
ier |= UART_IER_MSI;
siu_write(port, UART_IER, ier);
spin_unlock_irqrestore(&port->lock, flags);
}
static void siu_break_ctl(struct uart_port *port, int ctl)
{
unsigned long flags;
uint8_t lcr;
spin_lock_irqsave(&port->lock, flags);
lcr = siu_read(port, UART_LCR);
if (ctl == -1)
lcr |= UART_LCR_SBC;
else
lcr &= ~UART_LCR_SBC;
siu_write(port, UART_LCR, lcr);
spin_unlock_irqrestore(&port->lock, flags);
}
static inline void receive_chars(struct uart_port *port, uint8_t *status,
struct pt_regs *regs)
{
struct tty_struct *tty;
uint8_t lsr, ch;
char flag;
int max_count = RX_MAX_COUNT;
tty = port->info->tty;
lsr = *status;
do {
ch = siu_read(port, UART_RX);
port->icount.rx++;
flag = TTY_NORMAL;
#ifdef CONFIG_SERIAL_VR41XX_CONSOLE
lsr |= lsr_break_flag[port->line];
lsr_break_flag[port->line] = 0;
#endif
if (unlikely(lsr & (UART_LSR_BI | UART_LSR_FE |
UART_LSR_PE | UART_LSR_OE))) {
if (lsr & UART_LSR_BI) {
lsr &= ~(UART_LSR_FE | UART_LSR_PE);
port->icount.brk++;
if (uart_handle_break(port))
goto ignore_char;
}
if (lsr & UART_LSR_FE)
port->icount.frame++;
if (lsr & UART_LSR_PE)
port->icount.parity++;
if (lsr & UART_LSR_OE)
port->icount.overrun++;
lsr &= port->read_status_mask;
if (lsr & UART_LSR_BI)
flag = TTY_BREAK;
if (lsr & UART_LSR_FE)
flag = TTY_FRAME;
if (lsr & UART_LSR_PE)
flag = TTY_PARITY;
}
if (uart_handle_sysrq_char(port, ch, regs))
goto ignore_char;
uart_insert_char(port, lsr, UART_LSR_OE, ch, flag);
ignore_char:
lsr = siu_read(port, UART_LSR);
} while ((lsr & UART_LSR_DR) && (max_count-- > 0));
tty_flip_buffer_push(tty);
*status = lsr;
}
static inline void check_modem_status(struct uart_port *port)
{
uint8_t msr;
msr = siu_read(port, UART_MSR);
if ((msr & UART_MSR_ANY_DELTA) == 0)
return;
if (msr & UART_MSR_DDCD)
uart_handle_dcd_change(port, msr & UART_MSR_DCD);
if (msr & UART_MSR_TERI)
port->icount.rng++;
if (msr & UART_MSR_DDSR)
port->icount.dsr++;
if (msr & UART_MSR_DCTS)
uart_handle_cts_change(port, msr & UART_MSR_CTS);
wake_up_interruptible(&port->info->delta_msr_wait);
}
static inline void transmit_chars(struct uart_port *port)
{
struct circ_buf *xmit;
int max_count = TX_MAX_COUNT;
xmit = &port->info->xmit;
if (port->x_char) {
siu_write(port, UART_TX, port->x_char);
port->icount.tx++;
port->x_char = 0;
return;
}
if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
siu_stop_tx(port);
return;
}
do {
siu_write(port, UART_TX, xmit->buf[xmit->tail]);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
port->icount.tx++;
if (uart_circ_empty(xmit))
break;
} while (max_count-- > 0);
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
if (uart_circ_empty(xmit))
siu_stop_tx(port);
}
static irqreturn_t siu_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
struct uart_port *port;
uint8_t iir, lsr;
port = (struct uart_port *)dev_id;
iir = siu_read(port, UART_IIR);
if (iir & UART_IIR_NO_INT)
return IRQ_NONE;
lsr = siu_read(port, UART_LSR);
if (lsr & UART_LSR_DR)
receive_chars(port, &lsr, regs);
check_modem_status(port);
if (lsr & UART_LSR_THRE)
transmit_chars(port);
return IRQ_HANDLED;
}
static int siu_startup(struct uart_port *port)
{
int retval;
if (port->membase == NULL)
return -ENODEV;
siu_clear_fifo(port);
(void)siu_read(port, UART_LSR);
(void)siu_read(port, UART_RX);
(void)siu_read(port, UART_IIR);
(void)siu_read(port, UART_MSR);
if (siu_read(port, UART_LSR) == 0xff)
return -ENODEV;
retval = request_irq(port->irq, siu_interrupt, 0, siu_type_name(port), port);
if (retval)
return retval;
if (port->type == PORT_VR41XX_DSIU)
vr41xx_enable_dsiuint(DSIUINT_ALL);
siu_write(port, UART_LCR, UART_LCR_WLEN8);
spin_lock_irq(&port->lock);
siu_set_mctrl(port, port->mctrl);
spin_unlock_irq(&port->lock);
siu_write(port, UART_IER, UART_IER_RLSI | UART_IER_RDI);
(void)siu_read(port, UART_LSR);
(void)siu_read(port, UART_RX);
(void)siu_read(port, UART_IIR);
(void)siu_read(port, UART_MSR);
return 0;
}
static void siu_shutdown(struct uart_port *port)
{
unsigned long flags;
uint8_t lcr;
siu_write(port, UART_IER, 0);
spin_lock_irqsave(&port->lock, flags);
port->mctrl &= ~TIOCM_OUT2;
siu_set_mctrl(port, port->mctrl);
spin_unlock_irqrestore(&port->lock, flags);
lcr = siu_read(port, UART_LCR);
lcr &= ~UART_LCR_SBC;
siu_write(port, UART_LCR, lcr);
siu_clear_fifo(port);
(void)siu_read(port, UART_RX);
if (port->type == PORT_VR41XX_DSIU)
vr41xx_disable_dsiuint(DSIUINT_ALL);
free_irq(port->irq, port);
}
static void siu_set_termios(struct uart_port *port, struct termios *new,
struct termios *old)
{
tcflag_t c_cflag, c_iflag;
uint8_t lcr, fcr, ier;
unsigned int baud, quot;
unsigned long flags;
c_cflag = new->c_cflag;
switch (c_cflag & CSIZE) {
case CS5:
lcr = UART_LCR_WLEN5;
break;
case CS6:
lcr = UART_LCR_WLEN6;
break;
case CS7:
lcr = UART_LCR_WLEN7;
break;
default:
lcr = UART_LCR_WLEN8;
break;
}
if (c_cflag & CSTOPB)
lcr |= UART_LCR_STOP;
if (c_cflag & PARENB)
lcr |= UART_LCR_PARITY;
if ((c_cflag & PARODD) != PARODD)
lcr |= UART_LCR_EPAR;
if (c_cflag & CMSPAR)
lcr |= UART_LCR_SPAR;
baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16);
quot = uart_get_divisor(port, baud);
fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10;
spin_lock_irqsave(&port->lock, flags);
uart_update_timeout(port, c_cflag, baud);
c_iflag = new->c_iflag;
port->read_status_mask = UART_LSR_THRE | UART_LSR_OE | UART_LSR_DR;
if (c_iflag & INPCK)
port->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
if (c_iflag & (BRKINT | PARMRK))
port->read_status_mask |= UART_LSR_BI;
port->ignore_status_mask = 0;
if (c_iflag & IGNPAR)
port->ignore_status_mask |= UART_LSR_FE | UART_LSR_PE;
if (c_iflag & IGNBRK) {
port->ignore_status_mask |= UART_LSR_BI;
if (c_iflag & IGNPAR)
port->ignore_status_mask |= UART_LSR_OE;
}
if ((c_cflag & CREAD) == 0)
port->ignore_status_mask |= UART_LSR_DR;
ier = siu_read(port, UART_IER);
ier &= ~UART_IER_MSI;
if (UART_ENABLE_MS(port, c_cflag))
ier |= UART_IER_MSI;
siu_write(port, UART_IER, ier);
siu_write(port, UART_LCR, lcr | UART_LCR_DLAB);
siu_write(port, UART_DLL, (uint8_t)quot);
siu_write(port, UART_DLM, (uint8_t)(quot >> 8));
siu_write(port, UART_LCR, lcr);
siu_write(port, UART_FCR, fcr);
siu_set_mctrl(port, port->mctrl);
spin_unlock_irqrestore(&port->lock, flags);
}
static void siu_pm(struct uart_port *port, unsigned int state, unsigned int oldstate)
{
switch (state) {
case 0:
switch (port->type) {
case PORT_VR41XX_SIU:
vr41xx_supply_clock(SIU_CLOCK);
break;
case PORT_VR41XX_DSIU:
vr41xx_supply_clock(DSIU_CLOCK);
break;
}
break;
case 3:
switch (port->type) {
case PORT_VR41XX_SIU:
vr41xx_mask_clock(SIU_CLOCK);
break;
case PORT_VR41XX_DSIU:
vr41xx_mask_clock(DSIU_CLOCK);
break;
}
break;
}
}
static const char *siu_type(struct uart_port *port)
{
return siu_type_name(port);
}
static void siu_release_port(struct uart_port *port)
{
unsigned long size;
if (port->flags & UPF_IOREMAP) {
iounmap(port->membase);
port->membase = NULL;
}
size = siu_port_size(port);
release_mem_region(port->mapbase, size);
}
static int siu_request_port(struct uart_port *port)
{
unsigned long size;
struct resource *res;
size = siu_port_size(port);
res = request_mem_region(port->mapbase, size, siu_type_name(port));
if (res == NULL)
return -EBUSY;
if (port->flags & UPF_IOREMAP) {
port->membase = ioremap(port->mapbase, size);
if (port->membase == NULL) {
release_resource(res);
return -ENOMEM;
}
}
return 0;
}
static void siu_config_port(struct uart_port *port, int flags)
{
if (flags & UART_CONFIG_TYPE) {
port->type = siu_check_type(port);
(void)siu_request_port(port);
}
}
static int siu_verify_port(struct uart_port *port, struct serial_struct *serial)
{
if (port->type != PORT_VR41XX_SIU && port->type != PORT_VR41XX_DSIU)
return -EINVAL;
if (port->irq != serial->irq)
return -EINVAL;
if (port->iotype != serial->io_type)
return -EINVAL;
if (port->mapbase != (unsigned long)serial->iomem_base)
return -EINVAL;
return 0;
}
static struct uart_ops siu_uart_ops = {
.tx_empty = siu_tx_empty,
.set_mctrl = siu_set_mctrl,
.get_mctrl = siu_get_mctrl,
.stop_tx = siu_stop_tx,
.start_tx = siu_start_tx,
.stop_rx = siu_stop_rx,
.enable_ms = siu_enable_ms,
.break_ctl = siu_break_ctl,
.startup = siu_startup,
.shutdown = siu_shutdown,
.set_termios = siu_set_termios,
.pm = siu_pm,
.type = siu_type,
.release_port = siu_release_port,
.request_port = siu_request_port,
.config_port = siu_config_port,
.verify_port = siu_verify_port,
};
static int siu_init_ports(void)
{
const struct siu_port *siu;
struct uart_port *port;
int i, num;
switch (current_cpu_data.cputype) {
case CPU_VR4111:
case CPU_VR4121:
siu = siu_type1_ports;
break;
case CPU_VR4122:
case CPU_VR4131:
case CPU_VR4133:
siu = siu_type2_ports;
break;
default:
return 0;
}
port = siu_uart_ports;
num = siu_probe_ports();
for (i = 0; i < num; i++) {
spin_lock_init(&port->lock);
port->irq = siu->irq;
port->uartclk = SIU_BAUD_BASE * 16;
port->fifosize = 16;
port->regshift = 0;
port->iotype = UPIO_MEM;
port->flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
port->type = siu->type;
port->line = i;
port->mapbase = siu->start;
siu++;
port++;
}
return num;
}
#ifdef CONFIG_SERIAL_VR41XX_CONSOLE
#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
static void wait_for_xmitr(struct uart_port *port)
{
int timeout = 10000;
uint8_t lsr, msr;
do {
lsr = siu_read(port, UART_LSR);
if (lsr & UART_LSR_BI)
lsr_break_flag[port->line] = UART_LSR_BI;
if ((lsr & BOTH_EMPTY) == BOTH_EMPTY)
break;
} while (timeout-- > 0);
if (port->flags & UPF_CONS_FLOW) {
timeout = 1000000;
do {
msr = siu_read(port, UART_MSR);
if ((msr & UART_MSR_CTS) != 0)
break;
} while (timeout-- > 0);
}
}
static void siu_console_write(struct console *con, const char *s, unsigned count)
{
struct uart_port *port;
uint8_t ier;
unsigned i;
port = &siu_uart_ports[con->index];
ier = siu_read(port, UART_IER);
siu_write(port, UART_IER, 0);
for (i = 0; i < count && *s != '\0'; i++, s++) {
wait_for_xmitr(port);
siu_write(port, UART_TX, *s);
if (*s == '\n') {
wait_for_xmitr(port);
siu_write(port, UART_TX, '\r');
}
}
wait_for_xmitr(port);
siu_write(port, UART_IER, ier);
}
static int siu_console_setup(struct console *con, char *options)
{
struct uart_port *port;
int baud = 9600;
int parity = 'n';
int bits = 8;
int flow = 'n';
if (con->index >= SIU_PORTS_MAX)
con->index = 0;
port = &siu_uart_ports[con->index];
if (port->membase == NULL) {
if (port->mapbase == 0)
return -ENODEV;
port->membase = ioremap(port->mapbase, siu_port_size(port));
}
vr41xx_select_siu_interface(SIU_INTERFACE_RS232C);
if (options != NULL)
uart_parse_options(options, &baud, &parity, &bits, &flow);
return uart_set_options(port, con, baud, parity, bits, flow);
}
static struct uart_driver siu_uart_driver;
static struct console siu_console = {
.name = "ttyVR",
.write = siu_console_write,
.device = uart_console_device,
.setup = siu_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &siu_uart_driver,
};
static int __devinit siu_console_init(void)
{
struct uart_port *port;
int num, i;
num = siu_init_ports();
if (num <= 0)
return -ENODEV;
for (i = 0; i < num; i++) {
port = &siu_uart_ports[i];
port->ops = &siu_uart_ops;
}
register_console(&siu_console);
return 0;
}
console_initcall(siu_console_init);
#define SERIAL_VR41XX_CONSOLE &siu_console
#else
#define SERIAL_VR41XX_CONSOLE NULL
#endif
static struct uart_driver siu_uart_driver = {
.owner = THIS_MODULE,
.driver_name = "SIU",
.dev_name = "ttyVR",
.devfs_name = "ttvr/",
.major = SIU_MAJOR,
.minor = SIU_MINOR_BASE,
.cons = SERIAL_VR41XX_CONSOLE,
};
static int siu_probe(struct platform_device *dev)
{
struct uart_port *port;
int num, i, retval;
num = siu_init_ports();
if (num <= 0)
return -ENODEV;
siu_uart_driver.nr = num;
retval = uart_register_driver(&siu_uart_driver);
if (retval)
return retval;
for (i = 0; i < num; i++) {
port = &siu_uart_ports[i];
port->ops = &siu_uart_ops;
port->dev = &dev->dev;
retval = uart_add_one_port(&siu_uart_driver, port);
if (retval < 0) {
port->dev = NULL;
break;
}
}
if (i == 0 && retval < 0) {
uart_unregister_driver(&siu_uart_driver);
return retval;
}
return 0;
}
static int siu_remove(struct platform_device *dev)
{
struct uart_port *port;
int i;
for (i = 0; i < siu_uart_driver.nr; i++) {
port = &siu_uart_ports[i];
if (port->dev == &dev->dev) {
uart_remove_one_port(&siu_uart_driver, port);
port->dev = NULL;
}
}
uart_unregister_driver(&siu_uart_driver);
return 0;
}
static int siu_suspend(struct platform_device *dev, pm_message_t state)
{
struct uart_port *port;
int i;
for (i = 0; i < siu_uart_driver.nr; i++) {
port = &siu_uart_ports[i];
if ((port->type == PORT_VR41XX_SIU ||
port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
uart_suspend_port(&siu_uart_driver, port);
}
return 0;
}
static int siu_resume(struct platform_device *dev)
{
struct uart_port *port;
int i;
for (i = 0; i < siu_uart_driver.nr; i++) {
port = &siu_uart_ports[i];
if ((port->type == PORT_VR41XX_SIU ||
port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
uart_resume_port(&siu_uart_driver, port);
}
return 0;
}
static struct platform_device *siu_platform_device;
static struct platform_driver siu_device_driver = {
.probe = siu_probe,
.remove = siu_remove,
.suspend = siu_suspend,
.resume = siu_resume,
.driver = {
.name = "SIU",
},
};
static int __devinit vr41xx_siu_init(void)
{
int retval;
siu_platform_device = platform_device_register_simple("SIU", -1, NULL, 0);
if (IS_ERR(siu_platform_device))
return PTR_ERR(siu_platform_device);
retval = platform_driver_register(&siu_device_driver);
if (retval < 0)
platform_device_unregister(siu_platform_device);
return retval;
}
static void __devexit vr41xx_siu_exit(void)
{
platform_driver_unregister(&siu_device_driver);
platform_device_unregister(siu_platform_device);
}
module_init(vr41xx_siu_init);
module_exit(vr41xx_siu_exit);
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