[linux.git] / drivers / serial / clps711x.c

/*
 *  linux/drivers/char/clps711x.c
 *
 *  Driver for CLPS711x serial ports
 *
 *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
 *
 *  Copyright 1999 ARM Limited
 *  Copyright (C) 2000 Deep Blue Solutions Ltd.
 *
 * 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
 *
 *  $Id: clps711x.c,v 1.42 2002/07/28 10:03:28 rmk Exp $
 *
 */

#if defined(CONFIG_SERIAL_CLPS711X_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif

#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/sysrq.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
#include <linux/serial.h>

#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/hardware/clps7111.h>

#define UART_NR		2

#define SERIAL_CLPS711X_MAJOR	204
#define SERIAL_CLPS711X_MINOR	40
#define SERIAL_CLPS711X_NR	UART_NR

/*
 * We use the relevant SYSCON register as a base address for these ports.
 */
#define UBRLCR(port)		((port)->iobase + UBRLCR1 - SYSCON1)
#define UARTDR(port)		((port)->iobase + UARTDR1 - SYSCON1)
#define SYSFLG(port)		((port)->iobase + SYSFLG1 - SYSCON1)
#define SYSCON(port)		((port)->iobase + SYSCON1 - SYSCON1)

#define TX_IRQ(port)		((port)->irq)
#define RX_IRQ(port)		((port)->irq + 1)

#define UART_ANY_ERR		(UARTDR_FRMERR | UARTDR_PARERR | UARTDR_OVERR)

#define tx_enabled(port)	((port)->unused[0])

static void clps711xuart_stop_tx(struct uart_port *port)
{
	if (tx_enabled(port)) {
		disable_irq(TX_IRQ(port));
		tx_enabled(port) = 0;
	}
}

static void clps711xuart_start_tx(struct uart_port *port)
{
	if (!tx_enabled(port)) {
		enable_irq(TX_IRQ(port));
		tx_enabled(port) = 1;
	}
}

static void clps711xuart_stop_rx(struct uart_port *port)
{
	disable_irq(RX_IRQ(port));
}

static void clps711xuart_enable_ms(struct uart_port *port)
{
}

static irqreturn_t clps711xuart_int_rx(int irq, void *dev_id)
{
	struct uart_port *port = dev_id;
	struct tty_struct *tty = port->info->tty;
	unsigned int status, ch, flg;

	status = clps_readl(SYSFLG(port));
	while (!(status & SYSFLG_URXFE)) {
		ch = clps_readl(UARTDR(port));

		port->icount.rx++;

		flg = TTY_NORMAL;

		/*
		 * Note that the error handling code is
		 * out of the main execution path
		 */
		if (unlikely(ch & UART_ANY_ERR)) {
			if (ch & UARTDR_PARERR)
				port->icount.parity++;
			else if (ch & UARTDR_FRMERR)
				port->icount.frame++;
			if (ch & UARTDR_OVERR)
				port->icount.overrun++;

			ch &= port->read_status_mask;

			if (ch & UARTDR_PARERR)
				flg = TTY_PARITY;
			else if (ch & UARTDR_FRMERR)
				flg = TTY_FRAME;

#ifdef SUPPORT_SYSRQ
			port->sysrq = 0;
#endif
		}

		if (uart_handle_sysrq_char(port, ch))
			goto ignore_char;

		/*
		 * CHECK: does overrun affect the current character?
		 * ASSUMPTION: it does not.
		 */
		uart_insert_char(port, ch, UARTDR_OVERR, ch, flg);

	ignore_char:
		status = clps_readl(SYSFLG(port));
	}
	tty_flip_buffer_push(tty);
	return IRQ_HANDLED;
}

static irqreturn_t clps711xuart_int_tx(int irq, void *dev_id)
{
	struct uart_port *port = dev_id;
	struct circ_buf *xmit = &port->info->xmit;
	int count;

	if (port->x_char) {
		clps_writel(port->x_char, UARTDR(port));
		port->icount.tx++;
		port->x_char = 0;
		return IRQ_HANDLED;
	}
	if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
		clps711xuart_stop_tx(port);
		return IRQ_HANDLED;
	}

	count = port->fifosize >> 1;
	do {
		clps_writel(xmit->buf[xmit->tail], UARTDR(port));
		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
		port->icount.tx++;
		if (uart_circ_empty(xmit))
			break;
	} while (--count > 0);

	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
		uart_write_wakeup(port);

	if (uart_circ_empty(xmit))
		clps711xuart_stop_tx(port);

	return IRQ_HANDLED;
}

static unsigned int clps711xuart_tx_empty(struct uart_port *port)
{
	unsigned int status = clps_readl(SYSFLG(port));
	return status & SYSFLG_UBUSY ? 0 : TIOCSER_TEMT;
}

static unsigned int clps711xuart_get_mctrl(struct uart_port *port)
{
	unsigned int port_addr;
	unsigned int result = 0;
	unsigned int status;

	port_addr = SYSFLG(port);
	if (port_addr == SYSFLG1) {
		status = clps_readl(SYSFLG1);
		if (status & SYSFLG1_DCD)
			result |= TIOCM_CAR;
		if (status & SYSFLG1_DSR)
			result |= TIOCM_DSR;
		if (status & SYSFLG1_CTS)
			result |= TIOCM_CTS;
	}

	return result;
}

static void
clps711xuart_set_mctrl_null(struct uart_port *port, unsigned int mctrl)
{
}

static void clps711xuart_break_ctl(struct uart_port *port, int break_state)
{
	unsigned long flags;
	unsigned int ubrlcr;

	spin_lock_irqsave(&port->lock, flags);
	ubrlcr = clps_readl(UBRLCR(port));
	if (break_state == -1)
		ubrlcr |= UBRLCR_BREAK;
	else
		ubrlcr &= ~UBRLCR_BREAK;
	clps_writel(ubrlcr, UBRLCR(port));
	spin_unlock_irqrestore(&port->lock, flags);
}

static int clps711xuart_startup(struct uart_port *port)
{
	unsigned int syscon;
	int retval;

	tx_enabled(port) = 1;

	/*
	 * Allocate the IRQs
	 */
	retval = request_irq(TX_IRQ(port), clps711xuart_int_tx, 0,
			     "clps711xuart_tx", port);
	if (retval)
		return retval;

	retval = request_irq(RX_IRQ(port), clps711xuart_int_rx, 0,
			     "clps711xuart_rx", port);
	if (retval) {
		free_irq(TX_IRQ(port), port);
		return retval;
	}

	/*
	 * enable the port
	 */
	syscon = clps_readl(SYSCON(port));
	syscon |= SYSCON_UARTEN;
	clps_writel(syscon, SYSCON(port));

	return 0;
}

static void clps711xuart_shutdown(struct uart_port *port)
{
	unsigned int ubrlcr, syscon;

	/*
	 * Free the interrupt
	 */
	free_irq(TX_IRQ(port), port);	/* TX interrupt */
	free_irq(RX_IRQ(port), port);	/* RX interrupt */

	/*
	 * disable the port
	 */
	syscon = clps_readl(SYSCON(port));
	syscon &= ~SYSCON_UARTEN;
	clps_writel(syscon, SYSCON(port));

	/*
	 * disable break condition and fifos
	 */
	ubrlcr = clps_readl(UBRLCR(port));
	ubrlcr &= ~(UBRLCR_FIFOEN | UBRLCR_BREAK);
	clps_writel(ubrlcr, UBRLCR(port));
}

static void
clps711xuart_set_termios(struct uart_port *port, struct termios *termios,
			 struct termios *old)
{
	unsigned int ubrlcr, baud, quot;
	unsigned long flags;

	/*
	 * We don't implement CREAD.
	 */
	termios->c_cflag |= CREAD;

	/*
	 * Ask the core to calculate the divisor for us.
	 */
	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 
	quot = uart_get_divisor(port, baud);

	switch (termios->c_cflag & CSIZE) {
	case CS5:
		ubrlcr = UBRLCR_WRDLEN5;
		break;
	case CS6:
		ubrlcr = UBRLCR_WRDLEN6;
		break;
	case CS7:
		ubrlcr = UBRLCR_WRDLEN7;
		break;
	default: // CS8
		ubrlcr = UBRLCR_WRDLEN8;
		break;
	}
	if (termios->c_cflag & CSTOPB)
		ubrlcr |= UBRLCR_XSTOP;
	if (termios->c_cflag & PARENB) {
		ubrlcr |= UBRLCR_PRTEN;
		if (!(termios->c_cflag & PARODD))
			ubrlcr |= UBRLCR_EVENPRT;
	}
	if (port->fifosize > 1)
		ubrlcr |= UBRLCR_FIFOEN;

	spin_lock_irqsave(&port->lock, flags);

	/*
	 * Update the per-port timeout.
	 */
	uart_update_timeout(port, termios->c_cflag, baud);

	port->read_status_mask = UARTDR_OVERR;
	if (termios->c_iflag & INPCK)
		port->read_status_mask |= UARTDR_PARERR | UARTDR_FRMERR;

	/*
	 * Characters to ignore
	 */
	port->ignore_status_mask = 0;
	if (termios->c_iflag & IGNPAR)
		port->ignore_status_mask |= UARTDR_FRMERR | UARTDR_PARERR;
	if (termios->c_iflag & IGNBRK) {
		/*
		 * If we're ignoring parity and break indicators,
		 * ignore overruns to (for real raw support).
		 */
		if (termios->c_iflag & IGNPAR)
			port->ignore_status_mask |= UARTDR_OVERR;
	}

	quot -= 1;

	clps_writel(ubrlcr | quot, UBRLCR(port));

	spin_unlock_irqrestore(&port->lock, flags);
}

static const char *clps711xuart_type(struct uart_port *port)
{
	return port->type == PORT_CLPS711X ? "CLPS711x" : NULL;
}

/*
 * Configure/autoconfigure the port.
 */
static void clps711xuart_config_port(struct uart_port *port, int flags)
{
	if (flags & UART_CONFIG_TYPE)
		port->type = PORT_CLPS711X;
}

static void clps711xuart_release_port(struct uart_port *port)
{
}

static int clps711xuart_request_port(struct uart_port *port)
{
	return 0;
}

static struct uart_ops clps711x_pops = {
	.tx_empty	= clps711xuart_tx_empty,
	.set_mctrl	= clps711xuart_set_mctrl_null,
	.get_mctrl	= clps711xuart_get_mctrl,
	.stop_tx	= clps711xuart_stop_tx,
	.start_tx	= clps711xuart_start_tx,
	.stop_rx	= clps711xuart_stop_rx,
	.enable_ms	= clps711xuart_enable_ms,
	.break_ctl	= clps711xuart_break_ctl,
	.startup	= clps711xuart_startup,
	.shutdown	= clps711xuart_shutdown,
	.set_termios	= clps711xuart_set_termios,
	.type		= clps711xuart_type,
	.config_port	= clps711xuart_config_port,
	.release_port	= clps711xuart_release_port,
	.request_port	= clps711xuart_request_port,
};

static struct uart_port clps711x_ports[UART_NR] = {
	{
		.iobase		= SYSCON1,
		.irq		= IRQ_UTXINT1, /* IRQ_URXINT1, IRQ_UMSINT */
		.uartclk	= 3686400,
		.fifosize	= 16,
		.ops		= &clps711x_pops,
		.line		= 0,
		.flags		= UPF_BOOT_AUTOCONF,
	},
	{
		.iobase		= SYSCON2,
		.irq		= IRQ_UTXINT2, /* IRQ_URXINT2 */
		.uartclk	= 3686400,
		.fifosize	= 16,
		.ops		= &clps711x_pops,
		.line		= 1,
		.flags		= UPF_BOOT_AUTOCONF,
	}
};

#ifdef CONFIG_SERIAL_CLPS711X_CONSOLE
static void clps711xuart_console_putchar(struct uart_port *port, int ch)
{
	while (clps_readl(SYSFLG(port)) & SYSFLG_UTXFF)
		barrier();
	clps_writel(ch, UARTDR(port));
}

/*
 *	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.
 *
 *	Note that this is called with interrupts already disabled
 */
static void
clps711xuart_console_write(struct console *co, const char *s,
			   unsigned int count)
{
	struct uart_port *port = clps711x_ports + co->index;
	unsigned int status, syscon;

	/*
	 *	Ensure that the port is enabled.
	 */
	syscon = clps_readl(SYSCON(port));
	clps_writel(syscon | SYSCON_UARTEN, SYSCON(port));

	uart_console_write(port, s, count, clps711xuart_console_putchar);

	/*
	 *	Finally, wait for transmitter to become empty
	 *	and restore the uart state.
	 */
	do {
		status = clps_readl(SYSFLG(port));
	} while (status & SYSFLG_UBUSY);

	clps_writel(syscon, SYSCON(port));
}

static void __init
clps711xuart_console_get_options(struct uart_port *port, int *baud,
				 int *parity, int *bits)
{
	if (clps_readl(SYSCON(port)) & SYSCON_UARTEN) {
		unsigned int ubrlcr, quot;

		ubrlcr = clps_readl(UBRLCR(port));

		*parity = 'n';
		if (ubrlcr & UBRLCR_PRTEN) {
			if (ubrlcr & UBRLCR_EVENPRT)
				*parity = 'e';
			else
				*parity = 'o';
		}

		if ((ubrlcr & UBRLCR_WRDLEN_MASK) == UBRLCR_WRDLEN7)
			*bits = 7;
		else
			*bits = 8;

		quot = ubrlcr & UBRLCR_BAUD_MASK;
		*baud = port->uartclk / (16 * (quot + 1));
	}
}

static int __init clps711xuart_console_setup(struct console *co, char *options)
{
	struct uart_port *port;
	int baud = 38400;
	int bits = 8;
	int parity = 'n';
	int flow = 'n';

	/*
	 * Check whether an invalid uart number has been specified, and
	 * if so, search for the first available port that does have
	 * console support.
	 */
	port = uart_get_console(clps711x_ports, UART_NR, co);

	if (options)
		uart_parse_options(options, &baud, &parity, &bits, &flow);
	else
		clps711xuart_console_get_options(port, &baud, &parity, &bits);

	return uart_set_options(port, co, baud, parity, bits, flow);
}

static struct uart_driver clps711x_reg;
static struct console clps711x_console = {
	.name		= "ttyCL",
	.write		= clps711xuart_console_write,
	.device		= uart_console_device,
	.setup		= clps711xuart_console_setup,
	.flags		= CON_PRINTBUFFER,
	.index		= -1,
	.data		= &clps711x_reg,
};

static int __init clps711xuart_console_init(void)
{
	register_console(&clps711x_console);
	return 0;
}
console_initcall(clps711xuart_console_init);

#define CLPS711X_CONSOLE	&clps711x_console
#else
#define CLPS711X_CONSOLE	NULL
#endif

static struct uart_driver clps711x_reg = {
	.driver_name		= "ttyCL",
	.dev_name		= "ttyCL",
	.major			= SERIAL_CLPS711X_MAJOR,
	.minor			= SERIAL_CLPS711X_MINOR,
	.nr			= UART_NR,

	.cons			= CLPS711X_CONSOLE,
};

static int __init clps711xuart_init(void)
{
	int ret, i;

	printk(KERN_INFO "Serial: CLPS711x driver $Revision: 1.42 $\n");

	ret = uart_register_driver(&clps711x_reg);
	if (ret)
		return ret;

	for (i = 0; i < UART_NR; i++)
		uart_add_one_port(&clps711x_reg, &clps711x_ports[i]);

	return 0;
}

static void __exit clps711xuart_exit(void)
{
	int i;

	for (i = 0; i < UART_NR; i++)
		uart_remove_one_port(&clps711x_reg, &clps711x_ports[i]);

	uart_unregister_driver(&clps711x_reg);
}

module_init(clps711xuart_init);
module_exit(clps711xuart_exit);

MODULE_AUTHOR("Deep Blue Solutions Ltd");
MODULE_DESCRIPTION("CLPS-711x generic serial driver $Revision: 1.42 $");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CHARDEV(SERIAL_CLPS711X_MAJOR, SERIAL_CLPS711X_MINOR);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/drivers/char/clps711x.c
	3	*
	4	* Driver for CLPS711x serial ports
	5	*
	6	* Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
	7	*
	8	* Copyright 1999 ARM Limited
	9	* Copyright (C) 2000 Deep Blue Solutions Ltd.
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2 of the License, or
	14	* (at your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	24	*
	25	* $Id: clps711x.c,v 1.42 2002/07/28 10:03:28 rmk Exp $
	26	*
	27	*/
1da177e4 LT	28
	29	#if defined(CONFIG_SERIAL_CLPS711X_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
	30	#define SUPPORT_SYSRQ
	31	#endif
	32
	33	#include <linux/module.h>
	34	#include <linux/ioport.h>
	35	#include <linux/init.h>
	36	#include <linux/console.h>
	37	#include <linux/sysrq.h>
	38	#include <linux/spinlock.h>
	39	#include <linux/device.h>
	40	#include <linux/tty.h>
	41	#include <linux/tty_flip.h>
	42	#include <linux/serial_core.h>
	43	#include <linux/serial.h>
	44
	45	#include <asm/hardware.h>
	46	#include <asm/io.h>
	47	#include <asm/irq.h>
	48	#include <asm/hardware/clps7111.h>
	49
	50	#define UART_NR 2
	51
	52	#define SERIAL_CLPS711X_MAJOR 204
	53	#define SERIAL_CLPS711X_MINOR 40
	54	#define SERIAL_CLPS711X_NR UART_NR
	55
	56	/*
	57	* We use the relevant SYSCON register as a base address for these ports.
	58	*/
	59	#define UBRLCR(port) ((port)->iobase + UBRLCR1 - SYSCON1)
	60	#define UARTDR(port) ((port)->iobase + UARTDR1 - SYSCON1)
	61	#define SYSFLG(port) ((port)->iobase + SYSFLG1 - SYSCON1)
	62	#define SYSCON(port) ((port)->iobase + SYSCON1 - SYSCON1)
	63
	64	#define TX_IRQ(port) ((port)->irq)
	65	#define RX_IRQ(port) ((port)->irq + 1)
	66
	67	#define UART_ANY_ERR (UARTDR_FRMERR \| UARTDR_PARERR \| UARTDR_OVERR)
	68
	69	#define tx_enabled(port) ((port)->unused[0])
	70
b129a8cc	71	static void clps711xuart_stop_tx(struct uart_port *port)
1da177e4 LT	72	{
	73	if (tx_enabled(port)) {
	74	disable_irq(TX_IRQ(port));
	75	tx_enabled(port) = 0;
	76	}
	77	}
	78
b129a8cc	79	static void clps711xuart_start_tx(struct uart_port *port)
1da177e4 LT	80	{
	81	if (!tx_enabled(port)) {
	82	enable_irq(TX_IRQ(port));
	83	tx_enabled(port) = 1;
	84	}
	85	}
	86
	87	static void clps711xuart_stop_rx(struct uart_port *port)
	88	{
	89	disable_irq(RX_IRQ(port));
	90	}
	91
	92	static void clps711xuart_enable_ms(struct uart_port *port)
	93	{
	94	}
	95
7d12e780	96	static irqreturn_t clps711xuart_int_rx(int irq, void *dev_id)
1da177e4 LT	97	{
	98	struct uart_port *port = dev_id;
	99	struct tty_struct *tty = port->info->tty;
f9937242	100	unsigned int status, ch, flg;
1da177e4 LT	101
	102	status = clps_readl(SYSFLG(port));
	103	while (!(status & SYSFLG_URXFE)) {
	104	ch = clps_readl(UARTDR(port));
	105
1da177e4 LT	106	port->icount.rx++;
	107
	108	flg = TTY_NORMAL;
	109
	110	/*
	111	* Note that the error handling code is
	112	* out of the main execution path
	113	*/
2a9604b8 RK	114	if (unlikely(ch & UART_ANY_ERR)) {
	115	if (ch & UARTDR_PARERR)
	116	port->icount.parity++;
	117	else if (ch & UARTDR_FRMERR)
	118	port->icount.frame++;
	119	if (ch & UARTDR_OVERR)
	120	port->icount.overrun++;
1da177e4	121
2a9604b8	122	ch &= port->read_status_mask;
1da177e4	123
2a9604b8 RK	124	if (ch & UARTDR_PARERR)
	125	flg = TTY_PARITY;
	126	else if (ch & UARTDR_FRMERR)
	127	flg = TTY_FRAME;
1da177e4	128
2a9604b8 RK	129	#ifdef SUPPORT_SYSRQ
	130	port->sysrq = 0;
	131	#endif
	132	}
1da177e4	133
7d12e780	134	if (uart_handle_sysrq_char(port, ch))
2a9604b8	135	goto ignore_char;
1da177e4	136
1da177e4 LT	137	/*
	138	* CHECK: does overrun affect the current character?
	139	* ASSUMPTION: it does not.
	140	*/
05ab3014	141	uart_insert_char(port, ch, UARTDR_OVERR, ch, flg);
2a9604b8 RK	142
	143	ignore_char:
	144	status = clps_readl(SYSFLG(port));
1da177e4	145	}
2a9604b8 RK	146	tty_flip_buffer_push(tty);
2a9604b8 RK	147	return IRQ_HANDLED;
1da177e4 LT	148	}
1da177e4 LT	149
7d12e780	150	static irqreturn_t clps711xuart_int_tx(int irq, void *dev_id)
1da177e4 LT	151	{
	152	struct uart_port *port = dev_id;
	153	struct circ_buf *xmit = &port->info->xmit;
	154	int count;
	155
	156	if (port->x_char) {
	157	clps_writel(port->x_char, UARTDR(port));
	158	port->icount.tx++;
	159	port->x_char = 0;
	160	return IRQ_HANDLED;
	161	}
	162	if (uart_circ_empty(xmit) \|\| uart_tx_stopped(port)) {
b129a8cc	163	clps711xuart_stop_tx(port);
1da177e4 LT	164	return IRQ_HANDLED;
	165	}
	166
	167	count = port->fifosize >> 1;
	168	do {
	169	clps_writel(xmit->buf[xmit->tail], UARTDR(port));
	170	xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
	171	port->icount.tx++;
	172	if (uart_circ_empty(xmit))
	173	break;
	174	} while (--count > 0);
	175
	176	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
	177	uart_write_wakeup(port);
	178
	179	if (uart_circ_empty(xmit))
b129a8cc	180	clps711xuart_stop_tx(port);
1da177e4 LT	181
	182	return IRQ_HANDLED;
	183	}
	184
	185	static unsigned int clps711xuart_tx_empty(struct uart_port *port)
	186	{
	187	unsigned int status = clps_readl(SYSFLG(port));
	188	return status & SYSFLG_UBUSY ? 0 : TIOCSER_TEMT;
	189	}
	190
	191	static unsigned int clps711xuart_get_mctrl(struct uart_port *port)
	192	{
	193	unsigned int port_addr;
	194	unsigned int result = 0;
	195	unsigned int status;
	196
	197	port_addr = SYSFLG(port);
	198	if (port_addr == SYSFLG1) {
	199	status = clps_readl(SYSFLG1);
	200	if (status & SYSFLG1_DCD)
	201	result \|= TIOCM_CAR;
	202	if (status & SYSFLG1_DSR)
	203	result \|= TIOCM_DSR;
	204	if (status & SYSFLG1_CTS)
	205	result \|= TIOCM_CTS;
	206	}
	207
	208	return result;
	209	}
	210
	211	static void
	212	clps711xuart_set_mctrl_null(struct uart_port *port, unsigned int mctrl)
	213	{
	214	}
	215
	216	static void clps711xuart_break_ctl(struct uart_port *port, int break_state)
	217	{
	218	unsigned long flags;
	219	unsigned int ubrlcr;
	220
	221	spin_lock_irqsave(&port->lock, flags);
	222	ubrlcr = clps_readl(UBRLCR(port));
	223	if (break_state == -1)
	224	ubrlcr \|= UBRLCR_BREAK;
	225	else
	226	ubrlcr &= ~UBRLCR_BREAK;
	227	clps_writel(ubrlcr, UBRLCR(port));
	228	spin_unlock_irqrestore(&port->lock, flags);
	229	}
	230
	231	static int clps711xuart_startup(struct uart_port *port)
	232	{
	233	unsigned int syscon;
	234	int retval;
	235
	236	tx_enabled(port) = 1;
	237
	238	/*
	239	* Allocate the IRQs
	240	*/
	241	retval = request_irq(TX_IRQ(port), clps711xuart_int_tx, 0,
	242	"clps711xuart_tx", port);
	243	if (retval)
	244	return retval;
245
246	retval = request_irq(RX_IRQ(port), clps711xuart_int_rx, 0,
247	"clps711xuart_rx", port);
248	if (retval) {
249	free_irq(TX_IRQ(port), port);
250	return retval;
251	}
252
253	/*
254	* enable the port
255	*/
256	syscon = clps_readl(SYSCON(port));
257	syscon \|= SYSCON_UARTEN;
258	clps_writel(syscon, SYSCON(port));
259
260	return 0;
261	}
262
263	static void clps711xuart_shutdown(struct uart_port *port)
264	{
265	unsigned int ubrlcr, syscon;
266
267	/*
268	* Free the interrupt
269	*/
270	free_irq(TX_IRQ(port), port); /* TX interrupt */
271	free_irq(RX_IRQ(port), port); /* RX interrupt */
272
273	/*
274	* disable the port
275	*/
276	syscon = clps_readl(SYSCON(port));
277	syscon &= ~SYSCON_UARTEN;
278	clps_writel(syscon, SYSCON(port));
279
280	/*
281	* disable break condition and fifos
282	*/
283	ubrlcr = clps_readl(UBRLCR(port));
284	ubrlcr &= ~(UBRLCR_FIFOEN \| UBRLCR_BREAK);
285	clps_writel(ubrlcr, UBRLCR(port));
286	}
287
288	static void
289	clps711xuart_set_termios(struct uart_port port, struct termios termios,
290	struct termios *old)
291	{
292	unsigned int ubrlcr, baud, quot;
293	unsigned long flags;
294
295	/*
296	* We don't implement CREAD.
297	*/
298	termios->c_cflag \|= CREAD;
299
300	/*
301	* Ask the core to calculate the divisor for us.
302	*/
303	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
304	quot = uart_get_divisor(port, baud);
305
306	switch (termios->c_cflag & CSIZE) {
307	case CS5:
308	ubrlcr = UBRLCR_WRDLEN5;
309	break;
310	case CS6:
311	ubrlcr = UBRLCR_WRDLEN6;
312	break;
313	case CS7:
314	ubrlcr = UBRLCR_WRDLEN7;
315	break;
316	default: // CS8
317	ubrlcr = UBRLCR_WRDLEN8;
318	break;
319	}
320	if (termios->c_cflag & CSTOPB)
321	ubrlcr \|= UBRLCR_XSTOP;
322	if (termios->c_cflag & PARENB) {
323	ubrlcr \|= UBRLCR_PRTEN;
324	if (!(termios->c_cflag & PARODD))
325	ubrlcr \|= UBRLCR_EVENPRT;
326	}
327	if (port->fifosize > 1)
328	ubrlcr \|= UBRLCR_FIFOEN;
329
330	spin_lock_irqsave(&port->lock, flags);
331
332	/*
333	* Update the per-port timeout.
334	*/
335	uart_update_timeout(port, termios->c_cflag, baud);
336
337	port->read_status_mask = UARTDR_OVERR;
338	if (termios->c_iflag & INPCK)
339	port->read_status_mask \|= UARTDR_PARERR \| UARTDR_FRMERR;
340
341	/*
342	* Characters to ignore
343	*/
344	port->ignore_status_mask = 0;
345	if (termios->c_iflag & IGNPAR)
346	port->ignore_status_mask \|= UARTDR_FRMERR \| UARTDR_PARERR;
347	if (termios->c_iflag & IGNBRK) {
348	/*
349	* If we're ignoring parity and break indicators,
350	* ignore overruns to (for real raw support).
351	*/
352	if (termios->c_iflag & IGNPAR)
353	port->ignore_status_mask \|= UARTDR_OVERR;
354	}
355
356	quot -= 1;
357
358	clps_writel(ubrlcr \| quot, UBRLCR(port));
359
360	spin_unlock_irqrestore(&port->lock, flags);
361	}
362
363	static const char clps711xuart_type(struct uart_port port)
364	{
365	return port->type == PORT_CLPS711X ? "CLPS711x" : NULL;
366	}
367
368	/*
369	* Configure/autoconfigure the port.
370	*/
371	static void clps711xuart_config_port(struct uart_port *port, int flags)
372	{
373	if (flags & UART_CONFIG_TYPE)
374	port->type = PORT_CLPS711X;
375	}
376
377	static void clps711xuart_release_port(struct uart_port *port)
378	{
379	}
380
381	static int clps711xuart_request_port(struct uart_port *port)
382	{
383	return 0;
384	}
385
386	static struct uart_ops clps711x_pops = {
387	.tx_empty = clps711xuart_tx_empty,
388	.set_mctrl = clps711xuart_set_mctrl_null,
389	.get_mctrl = clps711xuart_get_mctrl,
390	.stop_tx = clps711xuart_stop_tx,
391	.start_tx = clps711xuart_start_tx,
392	.stop_rx = clps711xuart_stop_rx,
393	.enable_ms = clps711xuart_enable_ms,
394	.break_ctl = clps711xuart_break_ctl,
395	.startup = clps711xuart_startup,
396	.shutdown = clps711xuart_shutdown,
397	.set_termios = clps711xuart_set_termios,
398	.type = clps711xuart_type,
399	.config_port = clps711xuart_config_port,
400	.release_port = clps711xuart_release_port,
401	.request_port = clps711xuart_request_port,
402	};
403
404	static struct uart_port clps711x_ports[UART_NR] = {
405	{
406	.iobase = SYSCON1,
407	.irq = IRQ_UTXINT1, /* IRQ_URXINT1, IRQ_UMSINT */
408	.uartclk = 3686400,
409	.fifosize = 16,
410	.ops = &clps711x_pops,
411	.line = 0,
ce8337cb	412	.flags = UPF_BOOT_AUTOCONF,
1da177e4 LT	413	},
	414	{
	415	.iobase = SYSCON2,
	416	.irq = IRQ_UTXINT2, /* IRQ_URXINT2 */
	417	.uartclk = 3686400,
	418	.fifosize = 16,
	419	.ops = &clps711x_pops,
	420	.line = 1,
ce8337cb	421	.flags = UPF_BOOT_AUTOCONF,
1da177e4 LT	422	}
	423	};
	424
	425	#ifdef CONFIG_SERIAL_CLPS711X_CONSOLE
d358788f RK	426	static void clps711xuart_console_putchar(struct uart_port *port, int ch)
	427	{
	428	while (clps_readl(SYSFLG(port)) & SYSFLG_UTXFF)
	429	barrier();
	430	clps_writel(ch, UARTDR(port));
	431	}
	432
1da177e4 LT	433	/*
	434	* Print a string to the serial port trying not to disturb
	435	* any possible real use of the port...
	436	*
	437	* The console_lock must be held when we get here.
	438	*
	439	* Note that this is called with interrupts already disabled
	440	*/
	441	static void
	442	clps711xuart_console_write(struct console co, const char s,
	443	unsigned int count)
	444	{
	445	struct uart_port *port = clps711x_ports + co->index;
	446	unsigned int status, syscon;
1da177e4 LT	447
	448	/*
	449	* Ensure that the port is enabled.
	450	*/
	451	syscon = clps_readl(SYSCON(port));
	452	clps_writel(syscon \| SYSCON_UARTEN, SYSCON(port));
	453
d358788f	454	uart_console_write(port, s, count, clps711xuart_console_putchar);
1da177e4 LT	455
	456	/*
	457	* Finally, wait for transmitter to become empty
	458	* and restore the uart state.
	459	*/
	460	do {
	461	status = clps_readl(SYSFLG(port));
	462	} while (status & SYSFLG_UBUSY);
	463
	464	clps_writel(syscon, SYSCON(port));
	465	}
	466
	467	static void __init
	468	clps711xuart_console_get_options(struct uart_port port, int baud,
	469	int parity, int bits)
	470	{
	471	if (clps_readl(SYSCON(port)) & SYSCON_UARTEN) {
	472	unsigned int ubrlcr, quot;
	473
	474	ubrlcr = clps_readl(UBRLCR(port));
	475
	476	*parity = 'n';
	477	if (ubrlcr & UBRLCR_PRTEN) {
	478	if (ubrlcr & UBRLCR_EVENPRT)
	479	*parity = 'e';
	480	else
	481	*parity = 'o';
	482	}
	483
	484	if ((ubrlcr & UBRLCR_WRDLEN_MASK) == UBRLCR_WRDLEN7)
	485	*bits = 7;
	486	else
	487	*bits = 8;
	488
	489	quot = ubrlcr & UBRLCR_BAUD_MASK;
	490	baud = port->uartclk / (16 (quot + 1));
	491	}
	492	}
	493
	494	static int __init clps711xuart_console_setup(struct console co, char options)
	495	{
	496	struct uart_port *port;
	497	int baud = 38400;
	498	int bits = 8;
	499	int parity = 'n';
	500	int flow = 'n';
	501
	502	/*
	503	* Check whether an invalid uart number has been specified, and
	504	* if so, search for the first available port that does have
	505	* console support.
	506	*/
	507	port = uart_get_console(clps711x_ports, UART_NR, co);
	508
	509	if (options)
	510	uart_parse_options(options, &baud, &parity, &bits, &flow);
	511	else
	512	clps711xuart_console_get_options(port, &baud, &parity, &bits);
	513
	514	return uart_set_options(port, co, baud, parity, bits, flow);
	515	}
	516
2d93486c	517	static struct uart_driver clps711x_reg;
1da177e4 LT	518	static struct console clps711x_console = {
	519	.name = "ttyCL",
	520	.write = clps711xuart_console_write,
	521	.device = uart_console_device,
	522	.setup = clps711xuart_console_setup,
	523	.flags = CON_PRINTBUFFER,
	524	.index = -1,
	525	.data = &clps711x_reg,
	526	};
	527
	528	static int __init clps711xuart_console_init(void)
	529	{
	530	register_console(&clps711x_console);
	531	return 0;
	532	}
	533	console_initcall(clps711xuart_console_init);
	534
	535	#define CLPS711X_CONSOLE &clps711x_console
	536	#else
	537	#define CLPS711X_CONSOLE NULL
	538	#endif
	539
	540	static struct uart_driver clps711x_reg = {
	541	.driver_name = "ttyCL",
	542	.dev_name = "ttyCL",
	543	.major = SERIAL_CLPS711X_MAJOR,
	544	.minor = SERIAL_CLPS711X_MINOR,
	545	.nr = UART_NR,
	546
	547	.cons = CLPS711X_CONSOLE,
	548	};
	549
	550	static int __init clps711xuart_init(void)
	551	{
	552	int ret, i;
	553
	554	printk(KERN_INFO "Serial: CLPS711x driver $Revision: 1.42 $\n");
	555
	556	ret = uart_register_driver(&clps711x_reg);
	557	if (ret)
	558	return ret;
	559
	560	for (i = 0; i < UART_NR; i++)
	561	uart_add_one_port(&clps711x_reg, &clps711x_ports[i]);
	562
	563	return 0;
	564	}
	565
	566	static void __exit clps711xuart_exit(void)
	567	{
	568	int i;
	569
	570	for (i = 0; i < UART_NR; i++)
	571	uart_remove_one_port(&clps711x_reg, &clps711x_ports[i]);
	572
	573	uart_unregister_driver(&clps711x_reg);
	574	}
	575
	576	module_init(clps711xuart_init);
	577	module_exit(clps711xuart_exit);
	578
	579	MODULE_AUTHOR("Deep Blue Solutions Ltd");
	580	MODULE_DESCRIPTION("CLPS-711x generic serial driver $Revision: 1.42 $");
	581	MODULE_LICENSE("GPL");
582	MODULE_ALIAS_CHARDEV(SERIAL_CLPS711X_MAJOR, SERIAL_CLPS711X_MINOR);