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kernel-fxtec-pro1x/arch/ppc/4xx_io/serial_sicc.c
Greg Kroah-Hartman 331b831983 [PATCH] devfs: Rename TTY_DRIVER_NO_DEVFS to TTY_DRIVER_DYNAMIC_DEV 
I've always found this flag confusing.  Now that devfs is no longer around, it
has been renamed, and the documentation for when this flag should be used has
been updated.

Also fixes all drivers that use this flag.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-06-26 12:25:09 -07:00

2006 lines
61 KiB
C
Raw Blame History

/*
* Driver for IBM STB3xxx SICC serial port
*
* Based on drivers/char/serial_amba.c, by ARM Ltd.
*
* Copyright 2001 IBM Crop.
* Author: IBM China Research Lab
* Yudong Yang <yangyud@cn.ibm.com>
* Yi Ge <geyi@cn.ibm.com>
*
* 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
*
*
* This is a driver for SICC serial port on IBM Redwood 4 evaluation board.
* The driver support both as a console device and normal serial device and
* is compatible with normal ttyS* devices.
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/capability.h>
#include <linux/circ_buf.h>
#include <linux/serial.h>
#include <linux/console.h>
#include <linux/sysrq.h>
#include <linux/bitops.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/serial.h>
#include <linux/serialP.h>
/* -----------------------------------------------------------------------------
* From STB03xxx SICC UART Specification
* -----------------------------------------------------------------------------
* UART Register Offsets.
*/
#define BL_SICC_LSR 0x0000000 /* line status register read/clear */
#define BL_SICC_LSRS 0x0000001 /* set line status register read/set */
#define BL_SICC_HSR 0x0000002 /* handshake status register r/clear */
#define BL_SICC_HSRS 0x0000003 /* set handshake status register r/set */
#define BL_SICC_BRDH 0x0000004 /* baudrate divisor high reg r/w */
#define BL_SICC_BRDL 0x0000005 /* baudrate divisor low reg r/w */
#define BL_SICC_LCR 0x0000006 /* control register r/w */
#define BL_SICC_RCR 0x0000007 /* receiver command register r/w */
#define BL_SICC_TxCR 0x0000008 /* transmitter command register r/w */
#define BL_SICC_RBR 0x0000009 /* receive buffer r */
#define BL_SICC_TBR 0x0000009 /* transmit buffer w */
#define BL_SICC_CTL2 0x000000A /* added for Vesta */
#define BL_SICC_IrCR 0x000000B /* added for Vesta IR */
/* masks and definitions for serial port control register */
#define _LCR_LM_MASK 0xc0 /* loop back modes */
#define _LCR_DTR_MASK 0x20 /* data terminal ready 0-inactive */
#define _LCR_RTS_MASK 0x10 /* request to send 0-inactive */
#define _LCR_DB_MASK 0x08 /* data bits mask */
#define _LCR_PE_MASK 0x04 /* parity enable */
#define _LCR_PTY_MASK 0x02 /* parity */
#define _LCR_SB_MASK 0x01 /* stop bit mask */
#define _LCR_LM_NORM 0x00 /* normal operation */
#define _LCR_LM_LOOP 0x40 /* internal loopback mode */
#define _LCR_LM_ECHO 0x80 /* automatic echo mode */
#define _LCR_LM_RES 0xc0 /* reserved */
#define _LCR_DTR_ACTIVE _LCR_DTR_MASK /* DTR is active */
#define _LCR_RTS_ACTIVE _LCR_RTS_MASK /* RTS is active */
#define _LCR_DB_8_BITS _LCR_DB_MASK /* 8 data bits */
#define _LCR_DB_7_BITS 0x00 /* 7 data bits */
#define _LCR_PE_ENABLE _LCR_PE_MASK /* parity enabled */
#define _LCR_PE_DISABLE 0x00 /* parity disabled */
#define _LCR_PTY_EVEN 0x00 /* even parity */
#define _LCR_PTY_ODD _LCR_PTY_MASK /* odd parity */
#define _LCR_SB_1_BIT 0x00 /* one stop bit */
#define _LCR_SB_2_BIT _LCR_SB_MASK /* two stop bit */
/* serial port handshake register */
#define _HSR_DIS_MASK 0x80 /* DSR input inactive error mask */
#define _HSR_CS_MASK 0x40 /* CTS input inactive error mask */
#define _HSR_DIS_ACT 0x00 /* dsr input is active */
#define _HSR_DIS_INACT _HSR_DIS_MASK /* dsr input is inactive */
#define _HSR_CS_ACT 0x00 /* cts input is active */
#define _HSR_CS_INACT _HSR_CS_MASK /* cts input is active */
/* serial port line status register */
#define _LSR_RBR_MASK 0x80 /* receive buffer ready mask */
#define _LSR_FE_MASK 0x40 /* framing error */
#define _LSR_OE_MASK 0x20 /* overrun error */
#define _LSR_PE_MASK 0x10 /* parity error */
#define _LSR_LB_MASK 0x08 /* line break */
#define _LSR_TBR_MASK 0x04 /* transmit buffer ready */
#define _LSR_TSR_MASK 0x02 /* transmit shift register ready */
#define _LSR_RBR_FULL _LSR_RBR_MASK /* receive buffer is full */
#define _LSR_FE_ERROR _LSR_FE_MASK /* framing error detected */
#define _LSR_OE_ERROR _LSR_OE_MASK /* overrun error detected */
#define _LSR_PE_ERROR _LSR_PE_MASK /* parity error detected */
#define _LSR_LB_BREAK _LSR_LB_MASK /* line break detected */
#define _LSR_TBR_EMPTY _LSR_TBR_MASK /* transmit buffer is ready */
#define _LSR_TSR_EMPTY _LSR_TSR_MASK /* transmit shift register is empty */
#define _LSR_TX_ALL 0x06 /* all physical transmit is done */
#define _LSR_RX_ERR (_LSR_LB_BREAK | _LSR_FE_MASK | _LSR_OE_MASK | \
_LSR_PE_MASK )
/* serial port receiver command register */
#define _RCR_ER_MASK 0x80 /* enable receiver mask */
#define _RCR_DME_MASK 0x60 /* dma mode */
#define _RCR_EIE_MASK 0x10 /* error interrupt enable mask */
#define _RCR_PME_MASK 0x08 /* pause mode mask */
#define _RCR_ER_ENABLE _RCR_ER_MASK /* receiver enabled */
#define _RCR_DME_DISABLE 0x00 /* dma disabled */
#define _RCR_DME_RXRDY 0x20 /* dma disabled, RxRDY interrupt enabled*/
#define _RCR_DME_ENABLE2 0x40 /* dma enabled,receiver src channel 2 */
#define _RCR_DME_ENABLE3 0x60 /* dma enabled,receiver src channel 3 */
#define _RCR_PME_HARD _RCR_PME_MASK /* RTS controlled by hardware */
#define _RCR_PME_SOFT 0x00 /* RTS controlled by software */
/* serial port transmit command register */
#define _TxCR_ET_MASK 0x80 /* transmiter enable mask */
#define _TxCR_DME_MASK 0x60 /* dma mode mask */
#define _TxCR_TIE_MASK 0x10 /* empty interrupt enable mask */
#define _TxCR_EIE_MASK 0x08 /* error interrupt enable mask */
#define _TxCR_SPE_MASK 0x04 /* stop/pause mask */
#define _TxCR_TB_MASK 0x02 /* transmit break mask */
#define _TxCR_ET_ENABLE _TxCR_ET_MASK /* transmiter enabled */
#define _TxCR_DME_DISABLE 0x00 /* transmiter disabled, TBR intr disabled */
#define _TxCR_DME_TBR 0x20 /* transmiter disabled, TBR intr enabled */
#define _TxCR_DME_CHAN_2 0x40 /* dma enabled, destination chann 2 */
#define _TxCR_DME_CHAN_3 0x60 /* dma enabled, destination chann 3 */
/* serial ctl reg 2 - added for Vesta */
#define _CTL2_EXTERN 0x80 /* */
#define _CTL2_USEFIFO 0x40 /* */
#define _CTL2_RESETRF 0x08 /* */
#define _CTL2_RESETTF 0x04 /* */
#define SERIAL_SICC_NAME "ttySICC"
#define SERIAL_SICC_MAJOR 150
#define SERIAL_SICC_MINOR 1
#define SERIAL_SICC_NR 1
#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif
/*
* Things needed by tty driver
*/
static struct tty_driver *siccnormal_driver;
#if defined(CONFIG_SERIAL_SICC_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
/*
* Things needed internally to this driver
*/
/*
* tmp_buf is used as a temporary buffer by serial_write. We need to
* lock it in case the copy_from_user blocks while swapping in a page,
* and some other program tries to do a serial write at the same time.
* Since the lock will only come under contention when the system is
* swapping and available memory is low, it makes sense to share one
* buffer across all the serial ports, since it significantly saves
* memory if large numbers of serial ports are open.
*/
static u_char *tmp_buf;
#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
/* number of characters left in xmit buffer before we ask for more */
#define WAKEUP_CHARS 256
#define SICC_ISR_PASS_LIMIT 256
#define EVT_WRITE_WAKEUP 0
struct SICC_icount {
__u32 cts;
__u32 dsr;
__u32 rng;
__u32 dcd;
__u32 rx;
__u32 tx;
__u32 frame;
__u32 overrun;
__u32 parity;
__u32 brk;
__u32 buf_overrun;
};
/*
* Static information about the port
*/
struct SICC_port {
unsigned int uart_base;
unsigned int uart_base_phys;
unsigned int irqrx;
unsigned int irqtx;
unsigned int uartclk;
unsigned int fifosize;
unsigned int tiocm_support;
void (*set_mctrl)(struct SICC_port *, u_int mctrl);
};
/*
* This is the state information which is persistent across opens
*/
struct SICC_state {
struct SICC_icount icount;
unsigned int line;
unsigned int close_delay;
unsigned int closing_wait;
unsigned int custom_divisor;
unsigned int flags;
int count;
struct SICC_info *info;
spinlock_t sicc_lock;
};
#define SICC_XMIT_SIZE 1024
/*
* This is the state information which is only valid when the port is open.
*/
struct SICC_info {
struct SICC_port *port;
struct SICC_state *state;
struct tty_struct *tty;
unsigned char x_char;
unsigned char old_status;
unsigned char read_status_mask;
unsigned char ignore_status_mask;
struct circ_buf xmit;
unsigned int flags;
#ifdef SUPPORT_SYSRQ
unsigned long sysrq;
#endif
unsigned int event;
unsigned int timeout;
unsigned int lcr_h;
unsigned int mctrl;
int blocked_open;
struct tasklet_struct tlet;
wait_queue_head_t open_wait;
wait_queue_head_t close_wait;
wait_queue_head_t delta_msr_wait;
};
#ifdef CONFIG_SERIAL_SICC_CONSOLE
static struct console siccuart_cons;
#endif
static void siccuart_change_speed(struct SICC_info *info, struct termios *old_termios);
static void siccuart_wait_until_sent(struct tty_struct *tty, int timeout);
static void powerpcMtcic_cr(unsigned long value)
{
mtdcr(DCRN_CICCR, value);
}
static unsigned long powerpcMfcic_cr(void)
{
return mfdcr(DCRN_CICCR);
}
static unsigned long powerpcMfclkgpcr(void)
{
return mfdcr(DCRN_SCCR);
}
static void sicc_set_mctrl_null(struct SICC_port *port, u_int mctrl)
{
}
static struct SICC_port sicc_ports[SERIAL_SICC_NR] = {
{
.uart_base = 0,
.uart_base_phys = SICC0_IO_BASE,
.irqrx = SICC0_INTRX,
.irqtx = SICC0_INTTX,
// .uartclk = 0,
.fifosize = 1,
.set_mctrl = sicc_set_mctrl_null,
}
};
static struct SICC_state sicc_state[SERIAL_SICC_NR];
static void siccuart_enable_rx_interrupt(struct SICC_info *info)
{
unsigned char cr;
cr = readb(info->port->uart_base+BL_SICC_RCR);
cr &= ~_RCR_DME_MASK;
cr |= _RCR_DME_RXRDY;
writeb(cr, info->port->uart_base+BL_SICC_RCR);
}
static void siccuart_disable_rx_interrupt(struct SICC_info *info)
{
unsigned char cr;
cr = readb(info->port->uart_base+BL_SICC_RCR);
cr &= ~_RCR_DME_MASK;
cr |= _RCR_DME_DISABLE;
writeb(cr, info->port->uart_base+BL_SICC_RCR);
}
static void siccuart_enable_tx_interrupt(struct SICC_info *info)
{
unsigned char cr;
cr = readb(info->port->uart_base+BL_SICC_TxCR);
cr &= ~_TxCR_DME_MASK;
cr |= _TxCR_DME_TBR;
writeb(cr, info->port->uart_base+BL_SICC_TxCR);
}
static void siccuart_disable_tx_interrupt(struct SICC_info *info)
{
unsigned char cr;
cr = readb(info->port->uart_base+BL_SICC_TxCR);
cr &= ~_TxCR_DME_MASK;
cr |= _TxCR_DME_DISABLE;
writeb(cr, info->port->uart_base+BL_SICC_TxCR);
}
static void siccuart_stop(struct tty_struct *tty)
{
struct SICC_info *info = tty->driver_data;
unsigned long flags;
/* disable interrupts while stopping serial port interrupts */
spin_lock_irqsave(&info->state->sicc_lock,flags);
siccuart_disable_tx_interrupt(info);
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
}
static void siccuart_start(struct tty_struct *tty)
{
struct SICC_info *info = tty->driver_data;
unsigned long flags;
/* disable interrupts while starting serial port interrupts */
spin_lock_irqsave(&info->state->sicc_lock,flags);
if (info->xmit.head != info->xmit.tail
&& info->xmit.buf)
siccuart_enable_tx_interrupt(info);
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
}
/*
* This routine is used by the interrupt handler to schedule
* processing in the software interrupt portion of the driver.
*/
static void siccuart_event(struct SICC_info *info, int event)
{
info->event |= 1 << event;
tasklet_schedule(&info->tlet);
}
static void
siccuart_rx_chars(struct SICC_info *info, struct pt_regs *regs)
{
struct tty_struct *tty = info->tty;
unsigned int status, ch, rsr, flg, ignored = 0;
struct SICC_icount *icount = &info->state->icount;
struct SICC_port *port = info->port;
status = readb(port->uart_base+BL_SICC_LSR );
while (status & _LSR_RBR_FULL) {
ch = readb(port->uart_base+BL_SICC_RBR);
if (tty->flip.count >= TTY_FLIPBUF_SIZE)
goto ignore_char;
icount->rx++;
flg = TTY_NORMAL;
/*
* Note that the error handling code is
* out of the main execution path
*/
rsr = readb(port->uart_base+BL_SICC_LSR);
if (rsr & _LSR_RX_ERR)
goto handle_error;
#ifdef SUPPORT_SYSRQ
if (info->sysrq) {
if (ch && time_before(jiffies, info->sysrq)) {
handle_sysrq(ch, regs, NULL);
info->sysrq = 0;
goto ignore_char;
}
info->sysrq = 0;
}
#endif
error_return:
*tty->flip.flag_buf_ptr++ = flg;
*tty->flip.char_buf_ptr++ = ch;
tty->flip.count++;
ignore_char:
status = readb(port->uart_base+BL_SICC_LSR );
}
out:
tty_flip_buffer_push(tty);
return;
handle_error:
if (rsr & _LSR_LB_BREAK) {
rsr &= ~(_LSR_FE_MASK | _LSR_PE_MASK);
icount->brk++;
#ifdef SUPPORT_SYSRQ
if (info->state->line == siccuart_cons.index) {
if (!info->sysrq) {
info->sysrq = jiffies + HZ*5;
goto ignore_char;
}
}
#endif
} else if (rsr & _LSR_PE_MASK)
icount->parity++;
else if (rsr & _LSR_FE_MASK)
icount->frame++;
if (rsr & _LSR_OE_MASK)
icount->overrun++;
if (rsr & info->ignore_status_mask) {
if (++ignored > 100)
goto out;
goto ignore_char;
}
rsr &= info->read_status_mask;
if (rsr & _LSR_LB_BREAK)
flg = TTY_BREAK;
else if (rsr & _LSR_PE_MASK)
flg = TTY_PARITY;
else if (rsr & _LSR_FE_MASK)
flg = TTY_FRAME;
if (rsr & _LSR_OE_MASK) {
/*
* CHECK: does overrun affect the current character?
* ASSUMPTION: it does not.
*/
*tty->flip.flag_buf_ptr++ = flg;
*tty->flip.char_buf_ptr++ = ch;
tty->flip.count++;
if (tty->flip.count >= TTY_FLIPBUF_SIZE)
goto ignore_char;
ch = 0;
flg = TTY_OVERRUN;
}
#ifdef SUPPORT_SYSRQ
info->sysrq = 0;
#endif
goto error_return;
}
static void siccuart_tx_chars(struct SICC_info *info)
{
struct SICC_port *port = info->port;
int count;
unsigned char status;
if (info->x_char) {
writeb(info->x_char, port->uart_base+ BL_SICC_TBR);
info->state->icount.tx++;
info->x_char = 0;
return;
}
if (info->xmit.head == info->xmit.tail
|| info->tty->stopped
|| info->tty->hw_stopped) {
siccuart_disable_tx_interrupt(info);
writeb(status&(~_LSR_RBR_MASK),port->uart_base+BL_SICC_LSR);
return;
}
count = port->fifosize;
do {
writeb(info->xmit.buf[info->xmit.tail], port->uart_base+ BL_SICC_TBR);
info->xmit.tail = (info->xmit.tail + 1) & (SICC_XMIT_SIZE - 1);
info->state->icount.tx++;
if (info->xmit.head == info->xmit.tail)
break;
} while (--count > 0);
if (CIRC_CNT(info->xmit.head,
info->xmit.tail,
SICC_XMIT_SIZE) < WAKEUP_CHARS)
siccuart_event(info, EVT_WRITE_WAKEUP);
if (info->xmit.head == info->xmit.tail) {
siccuart_disable_tx_interrupt(info);
}
}
static irqreturn_t siccuart_int_rx(int irq, void *dev_id, struct pt_regs *regs)
{
struct SICC_info *info = dev_id;
siccuart_rx_chars(info, regs);
return IRQ_HANDLED;
}
static irqreturn_t siccuart_int_tx(int irq, void *dev_id, struct pt_regs *regs)
{
struct SICC_info *info = dev_id;
siccuart_tx_chars(info);
return IRQ_HANDLED;
}
static void siccuart_tasklet_action(unsigned long data)
{
struct SICC_info *info = (struct SICC_info *)data;
struct tty_struct *tty;
tty = info->tty;
if (!tty || !test_and_clear_bit(EVT_WRITE_WAKEUP, &info->event))
return;
if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
tty->ldisc.write_wakeup)
(tty->ldisc.write_wakeup)(tty);
wake_up_interruptible(&tty->write_wait);
}
static int siccuart_startup(struct SICC_info *info)
{
unsigned long flags;
unsigned long page;
int retval = 0;
if (info->flags & ASYNC_INITIALIZED) {
return 0;
}
page = get_zeroed_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
if (info->port->uart_base == 0)
info->port->uart_base = (int)ioremap(info->port->uart_base_phys, PAGE_SIZE);
if (info->port->uart_base == 0) {
free_page(page);
return -ENOMEM;
}
/* lock access to info while doing setup */
spin_lock_irqsave(&info->state->sicc_lock,flags);
if (info->xmit.buf)
free_page(page);
else
info->xmit.buf = (unsigned char *) page;
info->mctrl = 0;
if (info->tty->termios->c_cflag & CBAUD)
info->mctrl = TIOCM_RTS | TIOCM_DTR;
info->port->set_mctrl(info->port, info->mctrl);
/*
* initialise the old status of the modem signals
*/
info->old_status = 0; // UART_GET_FR(info->port) & AMBA_UARTFR_MODEM_ANY;
if (info->tty)
clear_bit(TTY_IO_ERROR, &info->tty->flags);
info->xmit.head = info->xmit.tail = 0;
/*
* Set up the tty->alt_speed kludge
*/
if (info->tty) {
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
info->tty->alt_speed = 57600;
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
info->tty->alt_speed = 115200;
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
info->tty->alt_speed = 230400;
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
info->tty->alt_speed = 460800;
}
writeb( 0x00, info->port->uart_base + BL_SICC_IrCR ); // disable IrDA
/*
* and set the speed of the serial port
*/
siccuart_change_speed(info, 0);
// enable rx/tx ports
writeb(_RCR_ER_ENABLE /*| _RCR_PME_HARD*/, info->port->uart_base + BL_SICC_RCR);
writeb(_TxCR_ET_ENABLE , info->port->uart_base + BL_SICC_TxCR);
readb(info->port->uart_base + BL_SICC_RBR); // clear rx port
writeb(0xf8, info->port->uart_base + BL_SICC_LSR); /* reset bits 0-4 of LSR */
/*
* Finally, enable interrupts
*/
/*
* Allocate the IRQ
*/
retval = request_irq(info->port->irqrx, siccuart_int_rx, 0, "SICC rx", info);
if (retval) {
if (capable(CAP_SYS_ADMIN)) {
if (info->tty)
set_bit(TTY_IO_ERROR, &info->tty->flags);
retval = 0;
}
goto errout;
}
retval = request_irq(info->port->irqtx, siccuart_int_tx, 0, "SICC tx", info);
if (retval) {
if (capable(CAP_SYS_ADMIN)) {
if (info->tty)
set_bit(TTY_IO_ERROR, &info->tty->flags);
retval = 0;
}
free_irq(info->port->irqrx, info);
goto errout;
}
siccuart_enable_rx_interrupt(info);
info->flags |= ASYNC_INITIALIZED;
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
return 0;
errout:
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
return retval;
}
/*
* This routine will shutdown a serial port; interrupts are disabled, and
* DTR is dropped if the hangup on close termio flag is on.
*/
static void siccuart_shutdown(struct SICC_info *info)
{
unsigned long flags;
if (!(info->flags & ASYNC_INITIALIZED))
return;
/* lock while shutting down port */
spin_lock_irqsave(&info->state->sicc_lock,flags); /* Disable interrupts */
/*
* clear delta_msr_wait queue to avoid mem leaks: we may free the irq
* here so the queue might never be woken up
*/
wake_up_interruptible(&info->delta_msr_wait);
/*
* disable all interrupts, disable the port
*/
siccuart_disable_rx_interrupt(info);
siccuart_disable_tx_interrupt(info);
/*
* Free the IRQ
*/
free_irq(info->port->irqtx, info);
free_irq(info->port->irqrx, info);
if (info->xmit.buf) {
unsigned long pg = (unsigned long) info->xmit.buf;
info->xmit.buf = NULL;
free_page(pg);
}
if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
info->mctrl &= ~(TIOCM_DTR|TIOCM_RTS);
info->port->set_mctrl(info->port, info->mctrl);
/* kill off our tasklet */
tasklet_kill(&info->tlet);
if (info->tty)
set_bit(TTY_IO_ERROR, &info->tty->flags);
info->flags &= ~ASYNC_INITIALIZED;
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
}
static void siccuart_change_speed(struct SICC_info *info, struct termios *old_termios)
{
unsigned int lcr_h, baud, quot, cflag, old_rcr, old_tcr, bits;
unsigned long flags;
if (!info->tty || !info->tty->termios)
return;
cflag = info->tty->termios->c_cflag;
pr_debug("siccuart_set_cflag(0x%x) called\n", cflag);
/* byte size and parity */
switch (cflag & CSIZE) {
case CS7: lcr_h = _LCR_PE_DISABLE | _LCR_DB_7_BITS | _LCR_SB_1_BIT; bits = 9; break;
default: lcr_h = _LCR_PE_DISABLE | _LCR_DB_8_BITS | _LCR_SB_1_BIT; bits = 10; break; // CS8
}
if (cflag & CSTOPB) {
lcr_h |= _LCR_SB_2_BIT;
bits ++;
}
if (cflag & PARENB) {
lcr_h |= _LCR_PE_ENABLE;
bits++;
if (!(cflag & PARODD))
lcr_h |= _LCR_PTY_ODD;
else
lcr_h |= _LCR_PTY_EVEN;
}
do {
/* Determine divisor based on baud rate */
baud = tty_get_baud_rate(info->tty);
if (!baud)
baud = 9600;
{
// here is ppc403SetBaud(com_port, baud);
unsigned long divisor, clockSource, temp;
/* Ensure CICCR[7] is 0 to select Internal Baud Clock */
powerpcMtcic_cr((unsigned long)(powerpcMfcic_cr() & 0xFEFFFFFF));
/* Determine Internal Baud Clock Frequency */
/* powerpcMfclkgpcr() reads DCR 0x120 - the*/
/* SCCR (Serial Clock Control Register) on Vesta */
temp = powerpcMfclkgpcr();
if(temp & 0x00000080) {
clockSource = 324000000;
}
else {
clockSource = 216000000;
}
clockSource = clockSource/(unsigned long)((temp&0x00FC0000)>>18);
divisor = clockSource/(16*baud) - 1;
/* divisor has only 12 bits of resolution */
if(divisor>0x00000FFF){
divisor=0x00000FFF;
}
quot = divisor;
}
if (baud == 38400 &&
((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
quot = info->state->custom_divisor;
if (!quot && old_termios) {
info->tty->termios->c_cflag &= ~CBAUD;
info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
old_termios = NULL;
}
} while (quot == 0 && old_termios);
/* As a last resort, if the quotient is zero, default to 9600 bps */
if (!quot)
quot = (info->port->uartclk / (16 * 9600)) - 1;
info->timeout = info->port->fifosize * HZ * bits / baud;
info->timeout += HZ/50; /* Add .02 seconds of slop */
if (cflag & CRTSCTS)
info->flags |= ASYNC_CTS_FLOW;
else
info->flags &= ~ASYNC_CTS_FLOW;
if (cflag & CLOCAL)
info->flags &= ~ASYNC_CHECK_CD;
else
info->flags |= ASYNC_CHECK_CD;
/*
* Set up parity check flag
*/
#define RELEVENT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
info->read_status_mask = _LSR_OE_MASK;
if (I_INPCK(info->tty))
info->read_status_mask |= _LSR_FE_MASK | _LSR_PE_MASK;
if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
info->read_status_mask |= _LSR_LB_MASK;
/*
* Characters to ignore
*/
info->ignore_status_mask = 0;
if (I_IGNPAR(info->tty))
info->ignore_status_mask |= _LSR_FE_MASK | _LSR_PE_MASK;
if (I_IGNBRK(info->tty)) {
info->ignore_status_mask |= _LSR_LB_MASK;
/*
* If we're ignoring parity and break indicators,
* ignore overruns to (for real raw support).
*/
if (I_IGNPAR(info->tty))
info->ignore_status_mask |= _LSR_OE_MASK;
}
/* disable interrupts while reading and clearing registers */
spin_lock_irqsave(&info->state->sicc_lock,flags);
old_rcr = readb(info->port->uart_base + BL_SICC_RCR);
old_tcr = readb(info->port->uart_base + BL_SICC_TxCR);
writeb(0, info->port->uart_base + BL_SICC_RCR);
writeb(0, info->port->uart_base + BL_SICC_TxCR);
/*RLBtrace (&ppc403Chan0, 0x2000000c, 0, 0);*/
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
/* Set baud rate */
writeb((quot & 0x00000F00)>>8, info->port->uart_base + BL_SICC_BRDH );
writeb( quot & 0x00000FF, info->port->uart_base + BL_SICC_BRDL );
/* Set CTL2 reg to use external clock (ExtClk) and enable FIFOs. */
/* For now, do NOT use FIFOs since 403 UART did not have this */
/* capability and this driver was inherited from 403UART. */
writeb(_CTL2_EXTERN, info->port->uart_base + BL_SICC_CTL2);
writeb(lcr_h, info->port->uart_base + BL_SICC_LCR);
writeb(old_rcr, info->port->uart_base + BL_SICC_RCR); // restore rcr
writeb(old_tcr, info->port->uart_base + BL_SICC_TxCR); // restore txcr
}
static void siccuart_put_char(struct tty_struct *tty, u_char ch)
{
struct SICC_info *info = tty->driver_data;
unsigned long flags;
if (!tty || !info->xmit.buf)
return;
/* lock info->xmit while adding character to tx buffer */
spin_lock_irqsave(&info->state->sicc_lock,flags);
if (CIRC_SPACE(info->xmit.head, info->xmit.tail, SICC_XMIT_SIZE) != 0) {
info->xmit.buf[info->xmit.head] = ch;
info->xmit.head = (info->xmit.head + 1) & (SICC_XMIT_SIZE - 1);
}
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
}
static void siccuart_flush_chars(struct tty_struct *tty)
{
struct SICC_info *info = tty->driver_data;
unsigned long flags;
if (info->xmit.head == info->xmit.tail
|| tty->stopped
|| tty->hw_stopped
|| !info->xmit.buf)
return;
/* disable interrupts while transmitting characters */
spin_lock_irqsave(&info->state->sicc_lock,flags);
siccuart_enable_tx_interrupt(info);
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
}
static int siccuart_write(struct tty_struct *tty,
const u_char * buf, int count)
{
struct SICC_info *info = tty->driver_data;
unsigned long flags;
int c, ret = 0;
if (!tty || !info->xmit.buf || !tmp_buf)
return 0;
/* lock info->xmit while removing characters from buffer */
spin_lock_irqsave(&info->state->sicc_lock,flags);
while (1) {
c = CIRC_SPACE_TO_END(info->xmit.head,
info->xmit.tail,
SICC_XMIT_SIZE);
if (count < c)
c = count;
if (c <= 0)
break;
memcpy(info->xmit.buf + info->xmit.head, buf, c);
info->xmit.head = (info->xmit.head + c) &
(SICC_XMIT_SIZE - 1);
buf += c;
count -= c;
ret += c;
}
if (info->xmit.head != info->xmit.tail
&& !tty->stopped
&& !tty->hw_stopped)
siccuart_enable_tx_interrupt(info);
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
return ret;
}
static int siccuart_write_room(struct tty_struct *tty)
{
struct SICC_info *info = tty->driver_data;
return CIRC_SPACE(info->xmit.head, info->xmit.tail, SICC_XMIT_SIZE);
}
static int siccuart_chars_in_buffer(struct tty_struct *tty)
{
struct SICC_info *info = tty->driver_data;
return CIRC_CNT(info->xmit.head, info->xmit.tail, SICC_XMIT_SIZE);
}
static void siccuart_flush_buffer(struct tty_struct *tty)
{
struct SICC_info *info = tty->driver_data;
unsigned long flags;
pr_debug("siccuart_flush_buffer(%d) called\n", tty->index);
/* lock info->xmit while zeroing buffer counts */
spin_lock_irqsave(&info->state->sicc_lock,flags);
info->xmit.head = info->xmit.tail = 0;
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
wake_up_interruptible(&tty->write_wait);
if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
tty->ldisc.write_wakeup)
(tty->ldisc.write_wakeup)(tty);
}
/*
* This function is used to send a high-priority XON/XOFF character to
* the device
*/
static void siccuart_send_xchar(struct tty_struct *tty, char ch)
{
struct SICC_info *info = tty->driver_data;
info->x_char = ch;
if (ch)
siccuart_enable_tx_interrupt(info);
}
static void siccuart_throttle(struct tty_struct *tty)
{
struct SICC_info *info = tty->driver_data;
unsigned long flags;
if (I_IXOFF(tty))
siccuart_send_xchar(tty, STOP_CHAR(tty));
if (tty->termios->c_cflag & CRTSCTS) {
/* disable interrupts while setting modem control lines */
spin_lock_irqsave(&info->state->sicc_lock,flags);
info->mctrl &= ~TIOCM_RTS;
info->port->set_mctrl(info->port, info->mctrl);
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
}
}
static void siccuart_unthrottle(struct tty_struct *tty)
{
struct SICC_info *info = (struct SICC_info *) tty->driver_data;
unsigned long flags;
if (I_IXOFF(tty)) {
if (info->x_char)
info->x_char = 0;
else
siccuart_send_xchar(tty, START_CHAR(tty));
}
if (tty->termios->c_cflag & CRTSCTS) {
/* disable interrupts while setting modem control lines */
spin_lock_irqsave(&info->state->sicc_lock,flags);
info->mctrl |= TIOCM_RTS;
info->port->set_mctrl(info->port, info->mctrl);
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
}
}
static int get_serial_info(struct SICC_info *info, struct serial_struct *retinfo)
{
struct SICC_state *state = info->state;
struct SICC_port *port = info->port;
struct serial_struct tmp;
memset(&tmp, 0, sizeof(tmp));
tmp.type = 0;
tmp.line = state->line;
tmp.port = port->uart_base;
if (HIGH_BITS_OFFSET)
tmp.port_high = port->uart_base >> HIGH_BITS_OFFSET;
tmp.irq = port->irqrx;
tmp.flags = 0;
tmp.xmit_fifo_size = port->fifosize;
tmp.baud_base = port->uartclk / 16;
tmp.close_delay = state->close_delay;
tmp.closing_wait = state->closing_wait;
tmp.custom_divisor = state->custom_divisor;
if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
return -EFAULT;
return 0;
}
static int set_serial_info(struct SICC_info *info,
struct serial_struct *newinfo)
{
struct serial_struct new_serial;
struct SICC_state *state, old_state;
struct SICC_port *port;
unsigned long new_port;
unsigned int i, change_irq, change_port;
int retval = 0;
if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
return -EFAULT;
state = info->state;
old_state = *state;
port = info->port;
new_port = new_serial.port;
if (HIGH_BITS_OFFSET)
new_port += (unsigned long) new_serial.port_high << HIGH_BITS_OFFSET;
change_irq = new_serial.irq != port->irqrx;
change_port = new_port != port->uart_base;
if (!capable(CAP_SYS_ADMIN)) {
if (change_irq || change_port ||
(new_serial.baud_base != port->uartclk / 16) ||
(new_serial.close_delay != state->close_delay) ||
(new_serial.xmit_fifo_size != port->fifosize) ||
((new_serial.flags & ~ASYNC_USR_MASK) !=
(state->flags & ~ASYNC_USR_MASK)))
return -EPERM;
state->flags = ((state->flags & ~ASYNC_USR_MASK) |
(new_serial.flags & ASYNC_USR_MASK));
info->flags = ((info->flags & ~ASYNC_USR_MASK) |
(new_serial.flags & ASYNC_USR_MASK));
state->custom_divisor = new_serial.custom_divisor;
goto check_and_exit;
}
if ((new_serial.irq >= NR_IRQS) || (new_serial.irq < 0) ||
(new_serial.baud_base < 9600))
return -EINVAL;
if (new_serial.type && change_port) {
for (i = 0; i < SERIAL_SICC_NR; i++)
if ((port != sicc_ports + i) &&
sicc_ports[i].uart_base != new_port)
return -EADDRINUSE;
}
if ((change_port || change_irq) && (state->count > 1))
return -EBUSY;
/*
* OK, past this point, all the error checking has been done.
* At this point, we start making changes.....
*/
port->uartclk = new_serial.baud_base * 16;
state->flags = ((state->flags & ~ASYNC_FLAGS) |
(new_serial.flags & ASYNC_FLAGS));
info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
(info->flags & ASYNC_INTERNAL_FLAGS));
state->custom_divisor = new_serial.custom_divisor;
state->close_delay = msecs_to_jiffies(10 * new_serial.close_delay);
state->closing_wait = msecs_to_jiffies(10 * new_serial.closing_wait);
info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
port->fifosize = new_serial.xmit_fifo_size;
if (change_port || change_irq) {
/*
* We need to shutdown the serial port at the old
* port/irq combination.
*/
siccuart_shutdown(info);
port->irqrx = new_serial.irq;
port->uart_base = new_port;
}
check_and_exit:
if (!port->uart_base)
return 0;
if (info->flags & ASYNC_INITIALIZED) {
if ((old_state.flags & ASYNC_SPD_MASK) !=
(state->flags & ASYNC_SPD_MASK) ||
(old_state.custom_divisor != state->custom_divisor)) {
if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
info->tty->alt_speed = 57600;
if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
info->tty->alt_speed = 115200;
if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
info->tty->alt_speed = 230400;
if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
info->tty->alt_speed = 460800;
siccuart_change_speed(info, NULL);
}
} else
retval = siccuart_startup(info);
return retval;
}
/*
* get_lsr_info - get line status register info
*/
static int get_lsr_info(struct SICC_info *info, unsigned int *value)
{
unsigned int result, status;
unsigned long flags;
/* disable interrupts while reading status from port */
spin_lock_irqsave(&info->state->sicc_lock,flags);
status = readb(info->port->uart_base + BL_SICC_LSR);
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
result = status & _LSR_TSR_EMPTY ? TIOCSER_TEMT : 0;
/*
* If we're about to load something into the transmit
* register, we'll pretend the transmitter isn't empty to
* avoid a race condition (depending on when the transmit
* interrupt happens).
*/
if (info->x_char ||
((CIRC_CNT(info->xmit.head, info->xmit.tail,
SICC_XMIT_SIZE) > 0) &&
!info->tty->stopped && !info->tty->hw_stopped))
result &= TIOCSER_TEMT;
return put_user(result, value);
}
static int get_modem_info(struct SICC_info *info, unsigned int *value)
{
unsigned int result = info->mctrl;
return put_user(result, value);
}
static int set_modem_info(struct SICC_info *info, unsigned int cmd,
unsigned int *value)
{
unsigned int arg, old;
unsigned long flags;
if (get_user(arg, value))
return -EFAULT;
old = info->mctrl;
switch (cmd) {
case TIOCMBIS:
info->mctrl |= arg;
break;
case TIOCMBIC:
info->mctrl &= ~arg;
break;
case TIOCMSET:
info->mctrl = arg;
break;
default:
return -EINVAL;
}
/* disable interrupts while setting modem control lines */
spin_lock_irqsave(&info->state->sicc_lock,flags);
if (old != info->mctrl)
info->port->set_mctrl(info->port, info->mctrl);
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
return 0;
}
static void siccuart_break_ctl(struct tty_struct *tty, int break_state)
{
struct SICC_info *info = tty->driver_data;
unsigned long flags;
unsigned int lcr_h;
/* disable interrupts while setting break state */
spin_lock_irqsave(&info->state->sicc_lock,flags);
lcr_h = readb(info->port + BL_SICC_LSR);
if (break_state == -1)
lcr_h |= _LSR_LB_MASK;
else
lcr_h &= ~_LSR_LB_MASK;
writeb(lcr_h, info->port + BL_SICC_LSRS);
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
}
static int siccuart_ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct SICC_info *info = tty->driver_data;
struct SICC_icount cnow;
struct serial_icounter_struct icount;
unsigned long flags;
if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
(cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
(cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
if (tty->flags & (1 << TTY_IO_ERROR))
return -EIO;
}
switch (cmd) {
case TIOCMGET:
return get_modem_info(info, (unsigned int *)arg);
case TIOCMBIS:
case TIOCMBIC:
case TIOCMSET:
return set_modem_info(info, cmd, (unsigned int *)arg);
case TIOCGSERIAL:
return get_serial_info(info,
(struct serial_struct *)arg);
case TIOCSSERIAL:
return set_serial_info(info,
(struct serial_struct *)arg);
case TIOCSERGETLSR: /* Get line status register */
return get_lsr_info(info, (unsigned int *)arg);
/*
* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
* - mask passed in arg for lines of interest
* (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
* Caller should use TIOCGICOUNT to see which one it was
*/
case TIOCMIWAIT:
return 0;
/*
* Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
* Return: write counters to the user passed counter struct
* NB: both 1->0 and 0->1 transitions are counted except for
* RI where only 0->1 is counted.
*/
case TIOCGICOUNT:
/* disable interrupts while getting interrupt count */
spin_lock_irqsave(&info->state->sicc_lock,flags);
cnow = info->state->icount;
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
icount.cts = cnow.cts;
icount.dsr = cnow.dsr;
icount.rng = cnow.rng;
icount.dcd = cnow.dcd;
icount.rx = cnow.rx;
icount.tx = cnow.tx;
icount.frame = cnow.frame;
icount.overrun = cnow.overrun;
icount.parity = cnow.parity;
icount.brk = cnow.brk;
icount.buf_overrun = cnow.buf_overrun;
return copy_to_user((void *)arg, &icount, sizeof(icount))
? -EFAULT : 0;
default:
return -ENOIOCTLCMD;
}
return 0;
}
static void siccuart_set_termios(struct tty_struct *tty, struct termios *old_termios)
{
struct SICC_info *info = tty->driver_data;
unsigned long flags;
unsigned int cflag = tty->termios->c_cflag;
if ((cflag ^ old_termios->c_cflag) == 0 &&
RELEVENT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0)
return;
siccuart_change_speed(info, old_termios);
/* Handle transition to B0 status */
if ((old_termios->c_cflag & CBAUD) &&
!(cflag & CBAUD)) {
/* disable interrupts while setting break state */
spin_lock_irqsave(&info->state->sicc_lock,flags);
info->mctrl &= ~(TIOCM_RTS | TIOCM_DTR);
info->port->set_mctrl(info->port, info->mctrl);
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
}
/* Handle transition away from B0 status */
if (!(old_termios->c_cflag & CBAUD) &&
(cflag & CBAUD)) {
/* disable interrupts while setting break state */
spin_lock_irqsave(&info->state->sicc_lock,flags);
info->mctrl |= TIOCM_DTR;
if (!(cflag & CRTSCTS) ||
!test_bit(TTY_THROTTLED, &tty->flags))
info->mctrl |= TIOCM_RTS;
info->port->set_mctrl(info->port, info->mctrl);
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
}
/* Handle turning off CRTSCTS */
if ((old_termios->c_cflag & CRTSCTS) &&
!(cflag & CRTSCTS)) {
tty->hw_stopped = 0;
siccuart_start(tty);
}
#if 0
/*
* No need to wake up processes in open wait, since they
* sample the CLOCAL flag once, and don't recheck it.
* XXX It's not clear whether the current behavior is correct
* or not. Hence, this may change.....
*/
if (!(old_termios->c_cflag & CLOCAL) &&
(tty->termios->c_cflag & CLOCAL))
wake_up_interruptible(&info->open_wait);
#endif
}
static void siccuart_close(struct tty_struct *tty, struct file *filp)
{
struct SICC_info *info = tty->driver_data;
struct SICC_state *state;
unsigned long flags;
if (!info)
return;
state = info->state;
//pr_debug("siccuart_close() called\n");
/* lock tty->driver_data while closing port */
spin_lock_irqsave(&info->state->sicc_lock,flags);
if (tty_hung_up_p(filp)) {
goto quick_close;
}
if ((tty->count == 1) && (state->count != 1)) {
/*
* Uh, oh. tty->count is 1, which means that the tty
* structure will be freed. state->count should always
* be one in these conditions. If it's greater than
* one, we've got real problems, since it means the
* serial port won't be shutdown.
*/
printk("siccuart_close: bad serial port count; tty->count is 1, state->count is %d\n", state->count);
state->count = 1;
}
if (--state->count < 0) {
printk("rs_close: bad serial port count for %s: %d\n", tty->name, state->count);
state->count = 0;
}
if (state->count) {
goto quick_close;
}
info->flags |= ASYNC_CLOSING;
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
/*
* Now we wait for the transmit buffer to clear; and we notify
* the line discipline to only process XON/XOFF characters.
*/
tty->closing = 1;
if (info->state->closing_wait != ASYNC_CLOSING_WAIT_NONE)
tty_wait_until_sent(tty, info->state->closing_wait);
/*
* At this point, we stop accepting input. To do this, we
* disable the receive line status interrupts.
*/
if (info->flags & ASYNC_INITIALIZED) {
siccuart_disable_rx_interrupt(info);
/*
* Before we drop DTR, make sure the UART transmitter
* has completely drained; this is especially
* important if there is a transmit FIFO!
*/
siccuart_wait_until_sent(tty, info->timeout);
}
siccuart_shutdown(info);
if (tty->driver->flush_buffer)
tty->driver->flush_buffer(tty);
if (tty->ldisc.flush_buffer)
tty->ldisc.flush_buffer(tty);
tty->closing = 0;
info->event = 0;
info->tty = NULL;
if (info->blocked_open) {
if (info->state->close_delay)
schedule_timeout_interruptible(info->state->close_delay);
wake_up_interruptible(&info->open_wait);
}
info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
wake_up_interruptible(&info->close_wait);
return;
quick_close:
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
return;
}
static void siccuart_wait_until_sent(struct tty_struct *tty, int timeout)
{
struct SICC_info *info = (struct SICC_info *) tty->driver_data;
unsigned long char_time, expire;
if (info->port->fifosize == 0)
return;
/*
* Set the check interval to be 1/5 of the estimated time to
* send a single character, and make it at least 1. The check
* interval should also be less than the timeout.
*
* Note: we have to use pretty tight timings here to satisfy
* the NIST-PCTS.
*/
char_time = (info->timeout - msecs_to_jiffies(20)) / info->port->fifosize;
char_time = char_time / 5;
if (char_time == 0)
char_time = 1;
// Crazy!! sometimes the input arg 'timeout' can be negtive numbers :-(
if (timeout >= 0 && timeout < char_time)
char_time = timeout;
/*
* If the transmitter hasn't cleared in twice the approximate
* amount of time to send the entire FIFO, it probably won't
* ever clear. This assumes the UART isn't doing flow
* control, which is currently the case. Hence, if it ever
* takes longer than info->timeout, this is probably due to a
* UART bug of some kind. So, we clamp the timeout parameter at
* 2*info->timeout.
*/
if (!timeout || timeout > 2 * info->timeout)
timeout = 2 * info->timeout;
expire = jiffies + timeout;
pr_debug("siccuart_wait_until_sent(%d), jiff=%lu, expire=%lu char_time=%lu...\n",
tty->index, jiffies,
expire, char_time);
while ((readb(info->port->uart_base + BL_SICC_LSR) & _LSR_TX_ALL) != _LSR_TX_ALL) {
schedule_timeout_interruptible(char_time);
if (signal_pending(current))
break;
if (timeout && time_after(jiffies, expire))
break;
}
set_current_state(TASK_RUNNING);
}
static void siccuart_hangup(struct tty_struct *tty)
{
struct SICC_info *info = tty->driver_data;
struct SICC_state *state = info->state;
siccuart_flush_buffer(tty);
if (info->flags & ASYNC_CLOSING)
return;
siccuart_shutdown(info);
info->event = 0;
state->count = 0;
info->flags &= ~ASYNC_NORMAL_ACTIVE;
info->tty = NULL;
wake_up_interruptible(&info->open_wait);
}
static int block_til_ready(struct tty_struct *tty, struct file *filp,
struct SICC_info *info)
{
DECLARE_WAITQUEUE(wait, current);
struct SICC_state *state = info->state;
unsigned long flags;
int do_clocal = 0, extra_count = 0, retval;
/*
* If the device is in the middle of being closed, then block
* until it's done, and then try again.
*/
if (tty_hung_up_p(filp) ||
(info->flags & ASYNC_CLOSING)) {
if (info->flags & ASYNC_CLOSING)
interruptible_sleep_on(&info->close_wait);
return (info->flags & ASYNC_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS;
}
/*
* If non-blocking mode is set, or the port is not enabled,
* then make the check up front and then exit.
*/
if ((filp->f_flags & O_NONBLOCK) ||
(tty->flags & (1 << TTY_IO_ERROR))) {
info->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
if (tty->termios->c_cflag & CLOCAL)
do_clocal = 1;
/*
* Block waiting for the carrier detect and the line to become
* free (i.e., not in use by the callout). While we are in
* this loop, state->count is dropped by one, so that
* rs_close() knows when to free things. We restore it upon
* exit, either normal or abnormal.
*/
retval = 0;
add_wait_queue(&info->open_wait, &wait);
/* lock while decrementing state->count */
spin_lock_irqsave(&info->state->sicc_lock,flags);
if (!tty_hung_up_p(filp)) {
extra_count = 1;
state->count--;
}
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
info->blocked_open++;
while (1) {
/* disable interrupts while setting modem control lines */
spin_lock_irqsave(&info->state->sicc_lock,flags);
if (tty->termios->c_cflag & CBAUD) {
info->mctrl = TIOCM_DTR | TIOCM_RTS;
info->port->set_mctrl(info->port, info->mctrl);
}
spin_unlock_irqrestore(&info->state->sicc_lock,flags);
set_current_state(TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp) ||
!(info->flags & ASYNC_INITIALIZED)) {
if (info->flags & ASYNC_HUP_NOTIFY)
retval = -EAGAIN;
else
retval = -ERESTARTSYS;
break;
}
if (!(info->flags & ASYNC_CLOSING) &&
(do_clocal /*|| (UART_GET_FR(info->port) & SICC_UARTFR_DCD)*/))
break;
if (signal_pending(current)) {
retval = -ERESTARTSYS;
break;
}
schedule();
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&info->open_wait, &wait);
if (extra_count)
state->count++;
info->blocked_open--;
if (retval)
return retval;
info->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
static struct SICC_info *siccuart_get(int line)
{
struct SICC_info *info;
struct SICC_state *state = sicc_state + line;
state->count++;
if (state->info)
return state->info;
info = kzalloc(sizeof(struct SICC_info), GFP_KERNEL);
if (info) {
init_waitqueue_head(&info->open_wait);
init_waitqueue_head(&info->close_wait);
init_waitqueue_head(&info->delta_msr_wait);
info->flags = state->flags;
info->state = state;
info->port = sicc_ports + line;
tasklet_init(&info->tlet, siccuart_tasklet_action,
(unsigned long)info);
}
if (state->info) {
kfree(info);
return state->info;
}
state->info = info;
return info;
}
static int siccuart_open(struct tty_struct *tty, struct file *filp)
{
struct SICC_info *info;
int retval, line = tty->index;
// is this a line that we've got?
if (line >= SERIAL_SICC_NR) {
return -ENODEV;
}
info = siccuart_get(line);
if (!info)
return -ENOMEM;
tty->driver_data = info;
info->tty = tty;
info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
/*
* Make sure we have the temporary buffer allocated
*/
if (!tmp_buf) {
unsigned long page = get_zeroed_page(GFP_KERNEL);
if (tmp_buf)
free_page(page);
else if (!page) {
return -ENOMEM;
}
tmp_buf = (u_char *)page;
}
/*
* If the port is in the middle of closing, bail out now.
*/
if (tty_hung_up_p(filp) ||
(info->flags & ASYNC_CLOSING)) {
if (info->flags & ASYNC_CLOSING)
interruptible_sleep_on(&info->close_wait);
return -EAGAIN;
}
/*
* Start up the serial port
*/
retval = siccuart_startup(info);
if (retval) {
return retval;
}
retval = block_til_ready(tty, filp, info);
if (retval) {
return retval;
}
#ifdef CONFIG_SERIAL_SICC_CONSOLE
if (siccuart_cons.cflag && siccuart_cons.index == line) {
tty->termios->c_cflag = siccuart_cons.cflag;
siccuart_cons.cflag = 0;
siccuart_change_speed(info, NULL);
}
#endif
return 0;
}
static struct tty_operations sicc_ops = {
.open = siccuart_open,
.close = siccuart_close,
.write = siccuart_write,
.put_char = siccuart_put_char,
.flush_chars = siccuart_flush_chars,
.write_room = siccuart_write_room,
.chars_in_buffer = siccuart_chars_in_buffer,
.flush_buffer = siccuart_flush_buffer,
.ioctl = siccuart_ioctl,
.throttle = siccuart_throttle,
.unthrottle = siccuart_unthrottle,
.send_xchar = siccuart_send_xchar,
.set_termios = siccuart_set_termios,
.stop = siccuart_stop,
.start = siccuart_start,
.hangup = siccuart_hangup,
.break_ctl = siccuart_break_ctl,
.wait_until_sent = siccuart_wait_until_sent,
};
int __init siccuart_init(void)
{
int i;
siccnormal_driver = alloc_tty_driver(SERIAL_SICC_NR);
if (!siccnormal_driver)
return -ENOMEM;
printk("IBM Vesta SICC serial port driver V 0.1 by Yudong Yang and Yi Ge / IBM CRL .\n");
siccnormal_driver->driver_name = "serial_sicc";
siccnormal_driver->owner = THIS_MODULE;
siccnormal_driver->name = SERIAL_SICC_NAME;
siccnormal_driver->major = SERIAL_SICC_MAJOR;
siccnormal_driver->minor_start = SERIAL_SICC_MINOR;
siccnormal_driver->type = TTY_DRIVER_TYPE_SERIAL;
siccnormal_driver->subtype = SERIAL_TYPE_NORMAL;
siccnormal_driver->init_termios = tty_std_termios;
siccnormal_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
siccnormal_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
tty_set_operations(siccnormal_driver, &sicc_ops);
if (tty_register_driver(siccnormal_driver))
panic("Couldn't register SICC serial driver\n");
for (i = 0; i < SERIAL_SICC_NR; i++) {
struct SICC_state *state = sicc_state + i;
state->line = i;
state->close_delay = msecs_to_jiffies(500);
state->closing_wait = 30 * HZ;
spin_lock_init(&state->sicc_lock);
}
return 0;
}
__initcall(siccuart_init);
#ifdef CONFIG_SERIAL_SICC_CONSOLE
/************** console driver *****************/
/*
* This code is currently never used; console->read is never called.
* Therefore, although we have an implementation, we don't use it.
* FIXME: the "const char *s" should be fixed to "char *s" some day.
* (when the definition in include/linux/console.h is also fixed)
*/
#ifdef used_and_not_const_char_pointer
static int siccuart_console_read(struct console *co, const char *s, u_int count)
{
struct SICC_port *port = &sicc_ports[co->index];
unsigned int status;
char *w;
int c;
pr_debug("siccuart_console_read() called\n");
c = 0;
w = s;
while (c < count) {
if(readb(port->uart_base + BL_SICC_LSR) & _LSR_RBR_FULL) {
*w++ = readb(port->uart_base + BL_SICC_RBR);
c++;
} else {
// nothing more to get, return
return c;
}
}
// return the count
return c;
}
#endif
/*
* Print a string to the serial port trying not to disturb
* any possible real use of the port...
*
* The console_lock must be held when we get here.
*/
static void siccuart_console_write(struct console *co, const char *s, u_int count)
{
struct SICC_port *port = &sicc_ports[co->index];
unsigned int old_cr;
int i;
/*
* First save the CR then disable the interrupts
*/
old_cr = readb(port->uart_base + BL_SICC_TxCR);
writeb(old_cr & ~_TxCR_DME_MASK, port->uart_base + BL_SICC_TxCR);
/*
* Now, do each character
*/
for (i = 0; i < count; i++) {
while ((readb(port->uart_base + BL_SICC_LSR)&_LSR_TX_ALL) != _LSR_TX_ALL);
writeb(s[i], port->uart_base + BL_SICC_TBR);
if (s[i] == '\n') {
while ((readb(port->uart_base + BL_SICC_LSR)&_LSR_TX_ALL) != _LSR_TX_ALL);
writeb('\r', port->uart_base + BL_SICC_TBR);
}
}
/*
* Finally, wait for transmitter to become empty
* and restore the TCR
*/
while ((readb(port->uart_base + BL_SICC_LSR)&_LSR_TX_ALL) != _LSR_TX_ALL);
writeb(old_cr, port->uart_base + BL_SICC_TxCR);
}
/*
* Receive character from the serial port
*/
static int siccuart_console_wait_key(struct console *co)
{
struct SICC_port *port = &sicc_ports[co->index];
int c;
while(!(readb(port->uart_base + BL_SICC_LSR) & _LSR_RBR_FULL));
c = readb(port->uart_base + BL_SICC_RBR);
return c;
}
static struct tty_driver *siccuart_console_device(struct console *c, int *index)
{
*index = c->index;
return siccnormal_driver;
}
static int __init siccuart_console_setup(struct console *co, char *options)
{
struct SICC_port *port;
int baud = 9600;
int bits = 8;
int parity = 'n';
u_int cflag = CREAD | HUPCL | CLOCAL;
u_int lcr_h, quot;
if (co->index >= SERIAL_SICC_NR)
co->index = 0;
port = &sicc_ports[co->index];
if (port->uart_base == 0)
port->uart_base = (int)ioremap(port->uart_base_phys, PAGE_SIZE);
if (options) {
char *s = options;
baud = simple_strtoul(s, NULL, 10);
while (*s >= '0' && *s <= '9')
s++;
if (*s) parity = *s++;
if (*s) bits = *s - '0';
}
/*
* Now construct a cflag setting.
*/
switch (baud) {
case 1200: cflag |= B1200; break;
case 2400: cflag |= B2400; break;
case 4800: cflag |= B4800; break;
default: cflag |= B9600; baud = 9600; break;
case 19200: cflag |= B19200; break;
case 38400: cflag |= B38400; break;
case 57600: cflag |= B57600; break;
case 115200: cflag |= B115200; break;
}
switch (bits) {
case 7: cflag |= CS7; lcr_h = _LCR_PE_DISABLE | _LCR_DB_7_BITS | _LCR_SB_1_BIT; break;
default: cflag |= CS8; lcr_h = _LCR_PE_DISABLE | _LCR_DB_8_BITS | _LCR_SB_1_BIT; break;
}
switch (parity) {
case 'o':
case 'O': cflag |= PARODD; lcr_h |= _LCR_PTY_ODD; break;
case 'e':
case 'E': cflag |= PARENB; lcr_h |= _LCR_PE_ENABLE | _LCR_PTY_ODD; break;
}
co->cflag = cflag;
{
// a copy of is inserted here ppc403SetBaud(com_port, (int)9600);
unsigned long divisor, clockSource, temp;
unsigned int rate = baud;
/* Ensure CICCR[7] is 0 to select Internal Baud Clock */
powerpcMtcic_cr((unsigned long)(powerpcMfcic_cr() & 0xFEFFFFFF));
/* Determine Internal Baud Clock Frequency */
/* powerpcMfclkgpcr() reads DCR 0x120 - the*/
/* SCCR (Serial Clock Control Register) on Vesta */
temp = powerpcMfclkgpcr();
if(temp & 0x00000080) {
clockSource = 324000000;
}
else {
clockSource = 216000000;
}
clockSource = clockSource/(unsigned long)((temp&0x00FC0000)>>18);
divisor = clockSource/(16*rate) - 1;
/* divisor has only 12 bits of resolution */
if(divisor>0x00000FFF){
divisor=0x00000FFF;
}
quot = divisor;
}
writeb((quot & 0x00000F00)>>8, port->uart_base + BL_SICC_BRDH );
writeb( quot & 0x00000FF, port->uart_base + BL_SICC_BRDL );
/* Set CTL2 reg to use external clock (ExtClk) and enable FIFOs. */
/* For now, do NOT use FIFOs since 403 UART did not have this */
/* capability and this driver was inherited from 403UART. */
writeb(_CTL2_EXTERN, port->uart_base + BL_SICC_CTL2);
writeb(lcr_h, port->uart_base + BL_SICC_LCR);
writeb(_RCR_ER_ENABLE | _RCR_PME_HARD, port->uart_base + BL_SICC_RCR);
writeb( _TxCR_ET_ENABLE , port->uart_base + BL_SICC_TxCR);
// writeb(, info->port->uart_base + BL_SICC_RCR );
/*
* Transmitter Command Register: Transmitter enabled & DMA + TBR interrupt
* + Transmitter Empty interrupt + Transmitter error interrupt disabled &
* Stop mode when CTS active enabled & Transmit Break + Pattern Generation
* mode disabled.
*/
writeb( 0x00, port->uart_base + BL_SICC_IrCR ); // disable IrDA
readb(port->uart_base + BL_SICC_RBR);
writeb(0xf8, port->uart_base + BL_SICC_LSR); /* reset bits 0-4 of LSR */
/* we will enable the port as we need it */
return 0;
}
static struct console siccuart_cons =
{
.name = SERIAL_SICC_NAME,
.write = siccuart_console_write,
#ifdef used_and_not_const_char_pointer
.read = siccuart_console_read,
#endif
.device = siccuart_console_device,
.wait_key = siccuart_console_wait_key,
.setup = siccuart_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
};
void __init sicc_console_init(void)
{
register_console(&siccuart_cons);
}
#endif /* CONFIG_SERIAL_SICC_CONSOLE */
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