[deliverable/linux.git] / drivers / serial / serial_ks8695.c

/*
 *  drivers/serial/serial_ks8695.c
 *
 *  Driver for KS8695 serial ports
 *
 *  Based on drivers/serial/serial_amba.c, by Kam Lee.
 *
 *  Copyright 2002-2005 Micrel Inc.
 *
 * 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.
 *
 */
#include <linux/module.h>
#include <linux/tty.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/serial.h>
#include <linux/console.h>
#include <linux/sysrq.h>
#include <linux/device.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mach/irq.h>

#include <mach/regs-uart.h>
#include <mach/regs-irq.h>

#if defined(CONFIG_SERIAL_KS8695_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif

#include <linux/serial_core.h>


#define SERIAL_KS8695_MAJOR	204
#define SERIAL_KS8695_MINOR	16
#define SERIAL_KS8695_DEVNAME	"ttyAM"

#define SERIAL_KS8695_NR	1

/*
 * Access macros for the KS8695 UART
 */
#define UART_GET_CHAR(p)	(__raw_readl((p)->membase + KS8695_URRB) & 0xFF)
#define UART_PUT_CHAR(p, c)	__raw_writel((c), (p)->membase + KS8695_URTH)
#define UART_GET_FCR(p)		__raw_readl((p)->membase + KS8695_URFC)
#define UART_PUT_FCR(p, c)	__raw_writel((c), (p)->membase + KS8695_URFC)
#define UART_GET_MSR(p)		__raw_readl((p)->membase + KS8695_URMS)
#define UART_GET_LSR(p)		__raw_readl((p)->membase + KS8695_URLS)
#define UART_GET_LCR(p)		__raw_readl((p)->membase + KS8695_URLC)
#define UART_PUT_LCR(p, c)	__raw_writel((c), (p)->membase + KS8695_URLC)
#define UART_GET_MCR(p)		__raw_readl((p)->membase + KS8695_URMC)
#define UART_PUT_MCR(p, c)	__raw_writel((c), (p)->membase + KS8695_URMC)
#define UART_GET_BRDR(p)	__raw_readl((p)->membase + KS8695_URBD)
#define UART_PUT_BRDR(p, c)	__raw_writel((c), (p)->membase + KS8695_URBD)

#define KS8695_CLR_TX_INT()	__raw_writel(1 << KS8695_IRQ_UART_TX, KS8695_IRQ_VA + KS8695_INTST)

#define UART_DUMMY_LSR_RX	0x100
#define UART_PORT_SIZE		(KS8695_USR - KS8695_URRB + 4)

static inline int tx_enabled(struct uart_port *port)
{
	return port->unused[0] & 1;
}

static inline int rx_enabled(struct uart_port *port)
{
	return port->unused[0] & 2;
}

static inline int ms_enabled(struct uart_port *port)
{
	return port->unused[0] & 4;
}

static inline void ms_enable(struct uart_port *port, int enabled)
{
	if(enabled)
		port->unused[0] |= 4;
	else
		port->unused[0] &= ~4;
}

static inline void rx_enable(struct uart_port *port, int enabled)
{
	if(enabled)
		port->unused[0] |= 2;
	else
		port->unused[0] &= ~2;
}

static inline void tx_enable(struct uart_port *port, int enabled)
{
	if(enabled)
		port->unused[0] |= 1;
	else
		port->unused[0] &= ~1;
}


#ifdef SUPPORT_SYSRQ
static struct console ks8695_console;
#endif

static void ks8695uart_stop_tx(struct uart_port *port)
{
	if (tx_enabled(port)) {
		disable_irq(KS8695_IRQ_UART_TX);
		tx_enable(port, 0);
	}
}

static void ks8695uart_start_tx(struct uart_port *port)
{
	if (!tx_enabled(port)) {
		enable_irq(KS8695_IRQ_UART_TX);
		tx_enable(port, 1);
	}
}

static void ks8695uart_stop_rx(struct uart_port *port)
{
	if (rx_enabled(port)) {
		disable_irq(KS8695_IRQ_UART_RX);
		rx_enable(port, 0);
	}
}

static void ks8695uart_enable_ms(struct uart_port *port)
{
	if (!ms_enabled(port)) {
		enable_irq(KS8695_IRQ_UART_MODEM_STATUS);
		ms_enable(port,1);
	}
}

static void ks8695uart_disable_ms(struct uart_port *port)
{
	if (ms_enabled(port)) {
		disable_irq(KS8695_IRQ_UART_MODEM_STATUS);
		ms_enable(port,0);
	}
}

static irqreturn_t ks8695uart_rx_chars(int irq, void *dev_id)
{
	struct uart_port *port = dev_id;
	struct tty_struct *tty = port->info->port.tty;
	unsigned int status, ch, lsr, flg, max_count = 256;

	status = UART_GET_LSR(port);		/* clears pending LSR interrupts */
	while ((status & URLS_URDR) && max_count--) {
		ch = UART_GET_CHAR(port);
		flg = TTY_NORMAL;

		port->icount.rx++;

		/*
		 * Note that the error handling code is
		 * out of the main execution path
		 */
		lsr = UART_GET_LSR(port) | UART_DUMMY_LSR_RX;
		if (unlikely(lsr & (URLS_URBI | URLS_URPE | URLS_URFE | URLS_URROE))) {
			if (lsr & URLS_URBI) {
				lsr &= ~(URLS_URFE | URLS_URPE);
				port->icount.brk++;
				if (uart_handle_break(port))
					goto ignore_char;
			}
			if (lsr & URLS_URPE)
				port->icount.parity++;
			if (lsr & URLS_URFE)
				port->icount.frame++;
			if (lsr & URLS_URROE)
				port->icount.overrun++;

			lsr &= port->read_status_mask;

			if (lsr & URLS_URBI)
				flg = TTY_BREAK;
			else if (lsr & URLS_URPE)
				flg = TTY_PARITY;
			else if (lsr & URLS_URFE)
				flg = TTY_FRAME;
		}

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

		uart_insert_char(port, lsr, URLS_URROE, ch, flg);

ignore_char:
		status = UART_GET_LSR(port);
	}
	tty_flip_buffer_push(tty);

	return IRQ_HANDLED;
}


static irqreturn_t ks8695uart_tx_chars(int irq, void *dev_id)
{
	struct uart_port *port = dev_id;
	struct circ_buf *xmit = &port->info->xmit;
	unsigned int count;

	if (port->x_char) {
		KS8695_CLR_TX_INT();
		UART_PUT_CHAR(port, port->x_char);
		port->icount.tx++;
		port->x_char = 0;
		return IRQ_HANDLED;
	}

	if (uart_tx_stopped(port) || uart_circ_empty(xmit)) {
		ks8695uart_stop_tx(port);
		return IRQ_HANDLED;
	}

	count = 16;	/* fifo size */
	while (!uart_circ_empty(xmit) && (count-- > 0)) {
		KS8695_CLR_TX_INT();
		UART_PUT_CHAR(port, xmit->buf[xmit->tail]);

		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
		port->icount.tx++;
	}

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

	if (uart_circ_empty(xmit))
		ks8695uart_stop_tx(port);

	return IRQ_HANDLED;
}

static irqreturn_t ks8695uart_modem_status(int irq, void *dev_id)
{
	struct uart_port *port = dev_id;
	unsigned int status;

	/*
	 * clear modem interrupt by reading MSR
	 */
	status = UART_GET_MSR(port);

	if (status & URMS_URDDCD)
		uart_handle_dcd_change(port, status & URMS_URDDCD);

	if (status & URMS_URDDST)
		port->icount.dsr++;

	if (status & URMS_URDCTS)
		uart_handle_cts_change(port, status & URMS_URDCTS);

	if (status & URMS_URTERI)
		port->icount.rng++;

	wake_up_interruptible(&port->info->delta_msr_wait);

	return IRQ_HANDLED;
}

static unsigned int ks8695uart_tx_empty(struct uart_port *port)
{
	return (UART_GET_LSR(port) & URLS_URTE) ? TIOCSER_TEMT : 0;
}

static unsigned int ks8695uart_get_mctrl(struct uart_port *port)
{
	unsigned int result = 0;
	unsigned int status;

	status = UART_GET_MSR(port);
	if (status & URMS_URDCD)
		result |= TIOCM_CAR;
	if (status & URMS_URDSR)
		result |= TIOCM_DSR;
	if (status & URMS_URCTS)
		result |= TIOCM_CTS;
	if (status & URMS_URRI)
		result |= TIOCM_RI;

	return result;
}

static void ks8695uart_set_mctrl(struct uart_port *port, u_int mctrl)
{
	unsigned int mcr;

	mcr = UART_GET_MCR(port);
	if (mctrl & TIOCM_RTS)
		mcr |= URMC_URRTS;
	else
		mcr &= ~URMC_URRTS;

	if (mctrl & TIOCM_DTR)
		mcr |= URMC_URDTR;
	else
		mcr &= ~URMC_URDTR;

	UART_PUT_MCR(port, mcr);
}

static void ks8695uart_break_ctl(struct uart_port *port, int break_state)
{
	unsigned int lcr;

	lcr = UART_GET_LCR(port);

	if (break_state == -1)
		lcr |= URLC_URSBC;
	else
		lcr &= ~URLC_URSBC;

	UART_PUT_LCR(port, lcr);
}

static int ks8695uart_startup(struct uart_port *port)
{
	int retval;

	set_irq_flags(KS8695_IRQ_UART_TX, IRQF_VALID | IRQF_NOAUTOEN);
	tx_enable(port, 0);
	rx_enable(port, 1);
	ms_enable(port, 1);

	/*
	 * Allocate the IRQ
	 */
	retval = request_irq(KS8695_IRQ_UART_TX, ks8695uart_tx_chars, IRQF_DISABLED, "UART TX", port);
	if (retval)
		goto err_tx;

	retval = request_irq(KS8695_IRQ_UART_RX, ks8695uart_rx_chars, IRQF_DISABLED, "UART RX", port);
	if (retval)
		goto err_rx;

	retval = request_irq(KS8695_IRQ_UART_LINE_STATUS, ks8695uart_rx_chars, IRQF_DISABLED, "UART LineStatus", port);
	if (retval)
		goto err_ls;

	retval = request_irq(KS8695_IRQ_UART_MODEM_STATUS, ks8695uart_modem_status, IRQF_DISABLED, "UART ModemStatus", port);
	if (retval)
		goto err_ms;

	return 0;

err_ms:
	free_irq(KS8695_IRQ_UART_LINE_STATUS, port);
err_ls:
	free_irq(KS8695_IRQ_UART_RX, port);
err_rx:
	free_irq(KS8695_IRQ_UART_TX, port);
err_tx:
	return retval;
}

static void ks8695uart_shutdown(struct uart_port *port)
{
	/*
	 * Free the interrupt
	 */
	free_irq(KS8695_IRQ_UART_RX, port);
	free_irq(KS8695_IRQ_UART_TX, port);
	free_irq(KS8695_IRQ_UART_MODEM_STATUS, port);
	free_irq(KS8695_IRQ_UART_LINE_STATUS, port);

	/* disable break condition and fifos */
	UART_PUT_LCR(port, UART_GET_LCR(port) & ~URLC_URSBC);
	UART_PUT_FCR(port, UART_GET_FCR(port) & ~URFC_URFE);
}

static void ks8695uart_set_termios(struct uart_port *port, struct ktermios *termios, struct ktermios *old)
{
	unsigned int lcr, fcr = 0;
	unsigned long flags;
	unsigned int baud, quot;

	/*
	 * 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:
		lcr = URCL_5;
		break;
	case CS6:
		lcr = URCL_6;
		break;
	case CS7:
		lcr = URCL_7;
		break;
	default:
		lcr = URCL_8;
		break;
	}

	/* stop bits */
	if (termios->c_cflag & CSTOPB)
		lcr |= URLC_URSB;

	/* parity */
	if (termios->c_cflag & PARENB) {
		if (termios->c_cflag & CMSPAR) {	/* Mark or Space parity */
			if (termios->c_cflag & PARODD)
				lcr |= URPE_MARK;
			else
				lcr |= URPE_SPACE;
		}
		else if (termios->c_cflag & PARODD)
			lcr |= URPE_ODD;
		else
			lcr |= URPE_EVEN;
	}

	if (port->fifosize > 1)
		fcr = URFC_URFRT_8 | URFC_URTFR | URFC_URRFR | URFC_URFE;

	spin_lock_irqsave(&port->lock, flags);

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

	port->read_status_mask = URLS_URROE;
	if (termios->c_iflag & INPCK)
		port->read_status_mask |= (URLS_URFE | URLS_URPE);
	if (termios->c_iflag & (BRKINT | PARMRK))
		port->read_status_mask |= URLS_URBI;

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

	/*
	 * Ignore all characters if CREAD is not set.
	 */
	if ((termios->c_cflag & CREAD) == 0)
		port->ignore_status_mask |= UART_DUMMY_LSR_RX;

	/* first, disable everything */
	if (UART_ENABLE_MS(port, termios->c_cflag))
		ks8695uart_enable_ms(port);
	else
		ks8695uart_disable_ms(port);

	/* Set baud rate */
	UART_PUT_BRDR(port, quot);

	UART_PUT_LCR(port, lcr);
	UART_PUT_FCR(port, fcr);

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

static const char *ks8695uart_type(struct uart_port *port)
{
	return port->type == PORT_KS8695 ? "KS8695" : NULL;
}

/*
 * Release the memory region(s) being used by 'port'
 */
static void ks8695uart_release_port(struct uart_port *port)
{
	release_mem_region(port->mapbase, UART_PORT_SIZE);
}

/*
 * Request the memory region(s) being used by 'port'
 */
static int ks8695uart_request_port(struct uart_port *port)
{
	return request_mem_region(port->mapbase, UART_PORT_SIZE,
			"serial_ks8695") != NULL ? 0 : -EBUSY;
}

/*
 * Configure/autoconfigure the port.
 */
static void ks8695uart_config_port(struct uart_port *port, int flags)
{
	if (flags & UART_CONFIG_TYPE) {
		port->type = PORT_KS8695;
		ks8695uart_request_port(port);
	}
}

/*
 * verify the new serial_struct (for TIOCSSERIAL).
 */
static int ks8695uart_verify_port(struct uart_port *port, struct serial_struct *ser)
{
	int ret = 0;

	if (ser->type != PORT_UNKNOWN && ser->type != PORT_KS8695)
		ret = -EINVAL;
	if (ser->irq != port->irq)
		ret = -EINVAL;
	if (ser->baud_base < 9600)
		ret = -EINVAL;
	return ret;
}

static struct uart_ops ks8695uart_pops = {
	.tx_empty	= ks8695uart_tx_empty,
	.set_mctrl	= ks8695uart_set_mctrl,
	.get_mctrl	= ks8695uart_get_mctrl,
	.stop_tx	= ks8695uart_stop_tx,
	.start_tx	= ks8695uart_start_tx,
	.stop_rx	= ks8695uart_stop_rx,
	.enable_ms	= ks8695uart_enable_ms,
	.break_ctl	= ks8695uart_break_ctl,
	.startup	= ks8695uart_startup,
	.shutdown	= ks8695uart_shutdown,
	.set_termios	= ks8695uart_set_termios,
	.type		= ks8695uart_type,
	.release_port	= ks8695uart_release_port,
	.request_port	= ks8695uart_request_port,
	.config_port	= ks8695uart_config_port,
	.verify_port	= ks8695uart_verify_port,
};

static struct uart_port ks8695uart_ports[SERIAL_KS8695_NR] = {
	{
		.membase	= (void *) KS8695_UART_VA,
		.mapbase	= KS8695_UART_VA,
		.iotype		= SERIAL_IO_MEM,
		.irq		= KS8695_IRQ_UART_TX,
		.uartclk	= CLOCK_TICK_RATE * 16,
		.fifosize	= 16,
		.ops		= &ks8695uart_pops,
		.flags		= ASYNC_BOOT_AUTOCONF,
		.line		= 0,
	}
};

#ifdef CONFIG_SERIAL_KS8695_CONSOLE
static void ks8695_console_putchar(struct uart_port *port, int ch)
{
	while (!(UART_GET_LSR(port) & URLS_URTHRE))
		barrier();

	UART_PUT_CHAR(port, ch);
}

static void ks8695_console_write(struct console *co, const char *s, u_int count)
{
	struct uart_port *port = ks8695uart_ports + co->index;

	uart_console_write(port, s, count, ks8695_console_putchar);
}

static void __init ks8695_console_get_options(struct uart_port *port, int *baud, int *parity, int *bits)
{
	unsigned int lcr;

	lcr = UART_GET_LCR(port);

	switch (lcr & URLC_PARITY) {
		case URPE_ODD:
			*parity = 'o';
			break;
		case URPE_EVEN:
			*parity = 'e';
			break;
		default:
			*parity = 'n';
	}

	switch (lcr & URLC_URCL) {
		case URCL_5:
			*bits = 5;
			break;
		case URCL_6:
			*bits = 6;
			break;
		case URCL_7:
			*bits = 7;
			break;
		default:
			*bits = 8;
	}

	*baud = port->uartclk / (UART_GET_BRDR(port) & 0x0FFF);
	*baud /= 16;
	*baud &= 0xFFFFFFF0;
}

static int __init ks8695_console_setup(struct console *co, char *options)
{
	struct uart_port *port;
	int baud = 115200;
	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(ks8695uart_ports, SERIAL_KS8695_NR, co);

	if (options)
		uart_parse_options(options, &baud, &parity, &bits, &flow);
	else
		ks8695_console_get_options(port, &baud, &parity, &bits);

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

static struct uart_driver ks8695_reg;

static struct console ks8695_console = {
	.name		= SERIAL_KS8695_DEVNAME,
	.write		= ks8695_console_write,
	.device		= uart_console_device,
	.setup		= ks8695_console_setup,
	.flags		= CON_PRINTBUFFER,
	.index		= -1,
	.data		= &ks8695_reg,
};

static int __init ks8695_console_init(void)
{
	register_console(&ks8695_console);
	return 0;
}

console_initcall(ks8695_console_init);

#define KS8695_CONSOLE	&ks8695_console
#else
#define KS8695_CONSOLE	NULL
#endif

static struct uart_driver ks8695_reg = {
	.owner			= THIS_MODULE,
	.driver_name		= "serial_ks8695",
	.dev_name		= SERIAL_KS8695_DEVNAME,
	.major			= SERIAL_KS8695_MAJOR,
	.minor			= SERIAL_KS8695_MINOR,
	.nr			= SERIAL_KS8695_NR,
	.cons			= KS8695_CONSOLE,
};

static int __init ks8695uart_init(void)
{
	int i, ret;

	printk(KERN_INFO "Serial: Micrel KS8695 UART driver\n");

	ret = uart_register_driver(&ks8695_reg);
	if (ret)
		return ret;

	for (i = 0; i < SERIAL_KS8695_NR; i++)
		uart_add_one_port(&ks8695_reg, &ks8695uart_ports[0]);

	return 0;
}

static void __exit ks8695uart_exit(void)
{
	int i;

	for (i = 0; i < SERIAL_KS8695_NR; i++)
		uart_remove_one_port(&ks8695_reg, &ks8695uart_ports[0]);
	uart_unregister_driver(&ks8695_reg);
}

module_init(ks8695uart_init);
module_exit(ks8695uart_exit);

MODULE_DESCRIPTION("KS8695 serial port driver");
MODULE_AUTHOR("Micrel Inc.");
MODULE_LICENSE("GPL");
Commit	Line	Data
2c7ee6ab AV	1	/*
	2	* drivers/serial/serial_ks8695.c
	3	*
	4	* Driver for KS8695 serial ports
	5	*
	6	* Based on drivers/serial/serial_amba.c, by Kam Lee.
	7	*
	8	* Copyright 2002-2005 Micrel Inc.
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	*/
	16	#include <linux/module.h>
	17	#include <linux/tty.h>
	18	#include <linux/ioport.h>
	19	#include <linux/init.h>
	20	#include <linux/serial.h>
	21	#include <linux/console.h>
	22	#include <linux/sysrq.h>
	23	#include <linux/device.h>
	24
	25	#include <asm/io.h>
	26	#include <asm/irq.h>
	27	#include <asm/mach/irq.h>
	28
a09e64fb RK	29	#include <mach/regs-uart.h>
a09e64fb RK	30	#include <mach/regs-irq.h>
2c7ee6ab AV	31
	32	#if defined(CONFIG_SERIAL_KS8695_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
	33	#define SUPPORT_SYSRQ
	34	#endif
	35
	36	#include <linux/serial_core.h>
	37
	38
	39	#define SERIAL_KS8695_MAJOR 204
	40	#define SERIAL_KS8695_MINOR 16
	41	#define SERIAL_KS8695_DEVNAME "ttyAM"
	42
	43	#define SERIAL_KS8695_NR 1
	44
	45	/*
	46	* Access macros for the KS8695 UART
	47	*/
	48	#define UART_GET_CHAR(p) (__raw_readl((p)->membase + KS8695_URRB) & 0xFF)
	49	#define UART_PUT_CHAR(p, c) __raw_writel((c), (p)->membase + KS8695_URTH)
	50	#define UART_GET_FCR(p) __raw_readl((p)->membase + KS8695_URFC)
	51	#define UART_PUT_FCR(p, c) __raw_writel((c), (p)->membase + KS8695_URFC)
	52	#define UART_GET_MSR(p) __raw_readl((p)->membase + KS8695_URMS)
	53	#define UART_GET_LSR(p) __raw_readl((p)->membase + KS8695_URLS)
	54	#define UART_GET_LCR(p) __raw_readl((p)->membase + KS8695_URLC)
	55	#define UART_PUT_LCR(p, c) __raw_writel((c), (p)->membase + KS8695_URLC)
	56	#define UART_GET_MCR(p) __raw_readl((p)->membase + KS8695_URMC)
	57	#define UART_PUT_MCR(p, c) __raw_writel((c), (p)->membase + KS8695_URMC)
	58	#define UART_GET_BRDR(p) __raw_readl((p)->membase + KS8695_URBD)
	59	#define UART_PUT_BRDR(p, c) __raw_writel((c), (p)->membase + KS8695_URBD)
	60
	61	#define KS8695_CLR_TX_INT() __raw_writel(1 << KS8695_IRQ_UART_TX, KS8695_IRQ_VA + KS8695_INTST)
	62
	63	#define UART_DUMMY_LSR_RX 0x100
	64	#define UART_PORT_SIZE (KS8695_USR - KS8695_URRB + 4)
	65
457cd4f5 DH	66	static inline int tx_enabled(struct uart_port *port)
	67	{
	68	return port->unused[0] & 1;
	69	}
	70
	71	static inline int rx_enabled(struct uart_port *port)
	72	{
	73	return port->unused[0] & 2;
	74	}
	75
	76	static inline int ms_enabled(struct uart_port *port)
	77	{
	78	return port->unused[0] & 4;
	79	}
	80
	81	static inline void ms_enable(struct uart_port *port, int enabled)
	82	{
	83	if(enabled)
	84	port->unused[0] \|= 4;
	85	else
	86	port->unused[0] &= ~4;
	87	}
	88
	89	static inline void rx_enable(struct uart_port *port, int enabled)
	90	{
	91	if(enabled)
	92	port->unused[0] \|= 2;
	93	else
	94	port->unused[0] &= ~2;
	95	}
	96
	97	static inline void tx_enable(struct uart_port *port, int enabled)
	98	{
	99	if(enabled)
	100	port->unused[0] \|= 1;
	101	else
	102	port->unused[0] &= ~1;
	103	}
2c7ee6ab AV	104
	105
	106	#ifdef SUPPORT_SYSRQ
	107	static struct console ks8695_console;
	108	#endif
	109
	110	static void ks8695uart_stop_tx(struct uart_port *port)
	111	{
	112	if (tx_enabled(port)) {
	113	disable_irq(KS8695_IRQ_UART_TX);
457cd4f5	114	tx_enable(port, 0);
2c7ee6ab AV	115	}
	116	}
	117
	118	static void ks8695uart_start_tx(struct uart_port *port)
	119	{
	120	if (!tx_enabled(port)) {
	121	enable_irq(KS8695_IRQ_UART_TX);
457cd4f5	122	tx_enable(port, 1);
2c7ee6ab AV	123	}
	124	}
	125
	126	static void ks8695uart_stop_rx(struct uart_port *port)
	127	{
	128	if (rx_enabled(port)) {
	129	disable_irq(KS8695_IRQ_UART_RX);
457cd4f5	130	rx_enable(port, 0);
2c7ee6ab AV	131	}
	132	}
	133
	134	static void ks8695uart_enable_ms(struct uart_port *port)
	135	{
457cd4f5 DH	136	if (!ms_enabled(port)) {
	137	enable_irq(KS8695_IRQ_UART_MODEM_STATUS);
	138	ms_enable(port,1);
	139	}
2c7ee6ab AV	140	}
	141
	142	static void ks8695uart_disable_ms(struct uart_port *port)
	143	{
457cd4f5 DH	144	if (ms_enabled(port)) {
	145	disable_irq(KS8695_IRQ_UART_MODEM_STATUS);
	146	ms_enable(port,0);
	147	}
2c7ee6ab AV	148	}
	149
	150	static irqreturn_t ks8695uart_rx_chars(int irq, void *dev_id)
	151	{
	152	struct uart_port *port = dev_id;
a88487c7	153	struct tty_struct *tty = port->info->port.tty;
2c7ee6ab AV	154	unsigned int status, ch, lsr, flg, max_count = 256;
	155
	156	status = UART_GET_LSR(port); /* clears pending LSR interrupts */
	157	while ((status & URLS_URDR) && max_count--) {
	158	ch = UART_GET_CHAR(port);
	159	flg = TTY_NORMAL;
	160
	161	port->icount.rx++;
	162
	163	/*
	164	* Note that the error handling code is
	165	* out of the main execution path
	166	*/
	167	lsr = UART_GET_LSR(port) \| UART_DUMMY_LSR_RX;
	168	if (unlikely(lsr & (URLS_URBI \| URLS_URPE \| URLS_URFE \| URLS_URROE))) {
	169	if (lsr & URLS_URBI) {
	170	lsr &= ~(URLS_URFE \| URLS_URPE);
	171	port->icount.brk++;
	172	if (uart_handle_break(port))
	173	goto ignore_char;
	174	}
	175	if (lsr & URLS_URPE)
	176	port->icount.parity++;
	177	if (lsr & URLS_URFE)
	178	port->icount.frame++;
	179	if (lsr & URLS_URROE)
	180	port->icount.overrun++;
	181
	182	lsr &= port->read_status_mask;
	183
	184	if (lsr & URLS_URBI)
	185	flg = TTY_BREAK;
	186	else if (lsr & URLS_URPE)
	187	flg = TTY_PARITY;
	188	else if (lsr & URLS_URFE)
	189	flg = TTY_FRAME;
	190	}
	191
	192	if (uart_handle_sysrq_char(port, ch))
	193	goto ignore_char;
	194
	195	uart_insert_char(port, lsr, URLS_URROE, ch, flg);
	196
	197	ignore_char:
	198	status = UART_GET_LSR(port);
	199	}
	200	tty_flip_buffer_push(tty);
	201
	202	return IRQ_HANDLED;
	203	}
	204
	205
	206	static irqreturn_t ks8695uart_tx_chars(int irq, void *dev_id)
	207	{
	208	struct uart_port *port = dev_id;
	209	struct circ_buf *xmit = &port->info->xmit;
	210	unsigned int count;
	211
	212	if (port->x_char) {
	213	KS8695_CLR_TX_INT();
	214	UART_PUT_CHAR(port, port->x_char);
	215	port->icount.tx++;
	216	port->x_char = 0;
	217	return IRQ_HANDLED;
218	}
219
220	if (uart_tx_stopped(port) \|\| uart_circ_empty(xmit)) {
221	ks8695uart_stop_tx(port);
222	return IRQ_HANDLED;
223	}
224
225	count = 16; /* fifo size */
226	while (!uart_circ_empty(xmit) && (count-- > 0)) {
227	KS8695_CLR_TX_INT();
228	UART_PUT_CHAR(port, xmit->buf[xmit->tail]);
229
230	xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
231	port->icount.tx++;
232	}
233
234	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
235	uart_write_wakeup(port);
236
237	if (uart_circ_empty(xmit))
238	ks8695uart_stop_tx(port);
239
240	return IRQ_HANDLED;
241	}
242
243	static irqreturn_t ks8695uart_modem_status(int irq, void *dev_id)
244	{
245	struct uart_port *port = dev_id;
246	unsigned int status;
247
248	/*
249	* clear modem interrupt by reading MSR
250	*/
251	status = UART_GET_MSR(port);
252
253	if (status & URMS_URDDCD)
254	uart_handle_dcd_change(port, status & URMS_URDDCD);
255
256	if (status & URMS_URDDST)
257	port->icount.dsr++;
258
259	if (status & URMS_URDCTS)
260	uart_handle_cts_change(port, status & URMS_URDCTS);
261
262	if (status & URMS_URTERI)
263	port->icount.rng++;
264
265	wake_up_interruptible(&port->info->delta_msr_wait);
266
267	return IRQ_HANDLED;
268	}
269
270	static unsigned int ks8695uart_tx_empty(struct uart_port *port)
271	{
272	return (UART_GET_LSR(port) & URLS_URTE) ? TIOCSER_TEMT : 0;
273	}
274
275	static unsigned int ks8695uart_get_mctrl(struct uart_port *port)
276	{
277	unsigned int result = 0;
278	unsigned int status;
279
280	status = UART_GET_MSR(port);
281	if (status & URMS_URDCD)
282	result \|= TIOCM_CAR;
283	if (status & URMS_URDSR)
284	result \|= TIOCM_DSR;
285	if (status & URMS_URCTS)
286	result \|= TIOCM_CTS;
287	if (status & URMS_URRI)
288	result \|= TIOCM_RI;
289
290	return result;
291	}
292
293	static void ks8695uart_set_mctrl(struct uart_port *port, u_int mctrl)
294	{
295	unsigned int mcr;
296
297	mcr = UART_GET_MCR(port);
298	if (mctrl & TIOCM_RTS)
299	mcr \|= URMC_URRTS;
300	else
301	mcr &= ~URMC_URRTS;
302
303	if (mctrl & TIOCM_DTR)
304	mcr \|= URMC_URDTR;
305	else
306	mcr &= ~URMC_URDTR;
307
308	UART_PUT_MCR(port, mcr);
309	}
310
311	static void ks8695uart_break_ctl(struct uart_port *port, int break_state)
312	{
313	unsigned int lcr;
314
315	lcr = UART_GET_LCR(port);
316
317	if (break_state == -1)
318	lcr \|= URLC_URSBC;
319	else
320	lcr &= ~URLC_URSBC;
321
322	UART_PUT_LCR(port, lcr);
323	}
324
325	static int ks8695uart_startup(struct uart_port *port)
326	{
327	int retval;
328
329	set_irq_flags(KS8695_IRQ_UART_TX, IRQF_VALID \| IRQF_NOAUTOEN);
457cd4f5 DH	330	tx_enable(port, 0);
	331	rx_enable(port, 1);
	332	ms_enable(port, 1);
2c7ee6ab AV	333
	334	/*
	335	* Allocate the IRQ
	336	*/
	337	retval = request_irq(KS8695_IRQ_UART_TX, ks8695uart_tx_chars, IRQF_DISABLED, "UART TX", port);
	338	if (retval)
	339	goto err_tx;
	340
	341	retval = request_irq(KS8695_IRQ_UART_RX, ks8695uart_rx_chars, IRQF_DISABLED, "UART RX", port);
	342	if (retval)
	343	goto err_rx;
	344
	345	retval = request_irq(KS8695_IRQ_UART_LINE_STATUS, ks8695uart_rx_chars, IRQF_DISABLED, "UART LineStatus", port);
	346	if (retval)
e45c7a43	347	goto err_ls;
2c7ee6ab AV	348
	349	retval = request_irq(KS8695_IRQ_UART_MODEM_STATUS, ks8695uart_modem_status, IRQF_DISABLED, "UART ModemStatus", port);
	350	if (retval)
e45c7a43	351	goto err_ms;
2c7ee6ab AV	352
	353	return 0;
	354
	355	err_ms:
	356	free_irq(KS8695_IRQ_UART_LINE_STATUS, port);
	357	err_ls:
	358	free_irq(KS8695_IRQ_UART_RX, port);
	359	err_rx:
	360	free_irq(KS8695_IRQ_UART_TX, port);
	361	err_tx:
	362	return retval;
	363	}
	364
	365	static void ks8695uart_shutdown(struct uart_port *port)
	366	{
	367	/*
	368	* Free the interrupt
	369	*/
	370	free_irq(KS8695_IRQ_UART_RX, port);
	371	free_irq(KS8695_IRQ_UART_TX, port);
	372	free_irq(KS8695_IRQ_UART_MODEM_STATUS, port);
	373	free_irq(KS8695_IRQ_UART_LINE_STATUS, port);
	374
	375	/* disable break condition and fifos */
	376	UART_PUT_LCR(port, UART_GET_LCR(port) & ~URLC_URSBC);
	377	UART_PUT_FCR(port, UART_GET_FCR(port) & ~URFC_URFE);
	378	}
	379
	380	static void ks8695uart_set_termios(struct uart_port port, struct ktermios termios, struct ktermios *old)
	381	{
	382	unsigned int lcr, fcr = 0;
	383	unsigned long flags;
	384	unsigned int baud, quot;
	385
	386	/*
	387	* Ask the core to calculate the divisor for us.
	388	*/
	389	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
	390	quot = uart_get_divisor(port, baud);
	391
	392	switch (termios->c_cflag & CSIZE) {
	393	case CS5:
	394	lcr = URCL_5;
	395	break;
	396	case CS6:
	397	lcr = URCL_6;
	398	break;
	399	case CS7:
	400	lcr = URCL_7;
	401	break;
	402	default:
	403	lcr = URCL_8;
	404	break;
	405	}
	406
	407	/* stop bits */
	408	if (termios->c_cflag & CSTOPB)
	409	lcr \|= URLC_URSB;
	410
	411	/* parity */
	412	if (termios->c_cflag & PARENB) {
	413	if (termios->c_cflag & CMSPAR) { /* Mark or Space parity */
	414	if (termios->c_cflag & PARODD)
	415	lcr \|= URPE_MARK;
416	else
417	lcr \|= URPE_SPACE;
418	}
419	else if (termios->c_cflag & PARODD)
420	lcr \|= URPE_ODD;
421	else
422	lcr \|= URPE_EVEN;
423	}
424
425	if (port->fifosize > 1)
426	fcr = URFC_URFRT_8 \| URFC_URTFR \| URFC_URRFR \| URFC_URFE;
427
428	spin_lock_irqsave(&port->lock, flags);
429
430	/*
431	* Update the per-port timeout.
432	*/
433	uart_update_timeout(port, termios->c_cflag, baud);
434
435	port->read_status_mask = URLS_URROE;
436	if (termios->c_iflag & INPCK)
437	port->read_status_mask \|= (URLS_URFE \| URLS_URPE);
438	if (termios->c_iflag & (BRKINT \| PARMRK))
439	port->read_status_mask \|= URLS_URBI;
440
441	/*
442	* Characters to ignore
443	*/
444	port->ignore_status_mask = 0;
445	if (termios->c_iflag & IGNPAR)
446	port->ignore_status_mask \|= (URLS_URFE \| URLS_URPE);
447	if (termios->c_iflag & IGNBRK) {
448	port->ignore_status_mask \|= URLS_URBI;
449	/*
450	* If we're ignoring parity and break indicators,
451	* ignore overruns too (for real raw support).
452	*/
453	if (termios->c_iflag & IGNPAR)
454	port->ignore_status_mask \|= URLS_URROE;
455	}
456
457	/*
458	* Ignore all characters if CREAD is not set.
459	*/
460	if ((termios->c_cflag & CREAD) == 0)
461	port->ignore_status_mask \|= UART_DUMMY_LSR_RX;
462
463	/* first, disable everything */
464	if (UART_ENABLE_MS(port, termios->c_cflag))
465	ks8695uart_enable_ms(port);
466	else
467	ks8695uart_disable_ms(port);
468
469	/* Set baud rate */
470	UART_PUT_BRDR(port, quot);
471
472	UART_PUT_LCR(port, lcr);
473	UART_PUT_FCR(port, fcr);
474
475	spin_unlock_irqrestore(&port->lock, flags);
476	}
477
478	static const char ks8695uart_type(struct uart_port port)
479	{
480	return port->type == PORT_KS8695 ? "KS8695" : NULL;
481	}
482
483	/*
484	* Release the memory region(s) being used by 'port'
485	*/
486	static void ks8695uart_release_port(struct uart_port *port)
487	{
488	release_mem_region(port->mapbase, UART_PORT_SIZE);
489	}
490
491	/*
492	* Request the memory region(s) being used by 'port'
493	*/
494	static int ks8695uart_request_port(struct uart_port *port)
495	{
496	return request_mem_region(port->mapbase, UART_PORT_SIZE,
497	"serial_ks8695") != NULL ? 0 : -EBUSY;
498	}
499
500	/*
501	* Configure/autoconfigure the port.
502	*/
503	static void ks8695uart_config_port(struct uart_port *port, int flags)
504	{
505	if (flags & UART_CONFIG_TYPE) {
506	port->type = PORT_KS8695;
507	ks8695uart_request_port(port);
508	}
509	}
510
511	/*
512	* verify the new serial_struct (for TIOCSSERIAL).
513	*/
514	static int ks8695uart_verify_port(struct uart_port port, struct serial_struct ser)
515	{
516	int ret = 0;
517
518	if (ser->type != PORT_UNKNOWN && ser->type != PORT_KS8695)
519	ret = -EINVAL;
520	if (ser->irq != port->irq)
521	ret = -EINVAL;
522	if (ser->baud_base < 9600)
523	ret = -EINVAL;
524	return ret;
525	}
526
527	static struct uart_ops ks8695uart_pops = {
528	.tx_empty = ks8695uart_tx_empty,
529	.set_mctrl = ks8695uart_set_mctrl,
530	.get_mctrl = ks8695uart_get_mctrl,
531	.stop_tx = ks8695uart_stop_tx,
532	.start_tx = ks8695uart_start_tx,
533	.stop_rx = ks8695uart_stop_rx,
534	.enable_ms = ks8695uart_enable_ms,
535	.break_ctl = ks8695uart_break_ctl,
536	.startup = ks8695uart_startup,
537	.shutdown = ks8695uart_shutdown,
538	.set_termios = ks8695uart_set_termios,
539	.type = ks8695uart_type,
540	.release_port = ks8695uart_release_port,
541	.request_port = ks8695uart_request_port,
542	.config_port = ks8695uart_config_port,
543	.verify_port = ks8695uart_verify_port,
544	};
545
546	static struct uart_port ks8695uart_ports[SERIAL_KS8695_NR] = {
547	{
548	.membase = (void *) KS8695_UART_VA,
549	.mapbase = KS8695_UART_VA,
550	.iotype = SERIAL_IO_MEM,
551	.irq = KS8695_IRQ_UART_TX,
552	.uartclk = CLOCK_TICK_RATE * 16,
553	.fifosize = 16,
554	.ops = &ks8695uart_pops,
555	.flags = ASYNC_BOOT_AUTOCONF,
556	.line = 0,
557	}
558	};
559
560	#ifdef CONFIG_SERIAL_KS8695_CONSOLE
561	static void ks8695_console_putchar(struct uart_port *port, int ch)
562	{
563	while (!(UART_GET_LSR(port) & URLS_URTHRE))
564	barrier();
565
566	UART_PUT_CHAR(port, ch);
567	}
568
569	static void ks8695_console_write(struct console co, const char s, u_int count)
570	{
571	struct uart_port *port = ks8695uart_ports + co->index;
572
573	uart_console_write(port, s, count, ks8695_console_putchar);
574	}
575
576	static void __init ks8695_console_get_options(struct uart_port port, int baud, int parity, int bits)
577	{
578	unsigned int lcr;
579
580	lcr = UART_GET_LCR(port);
581
582	switch (lcr & URLC_PARITY) {
583	case URPE_ODD:
584	*parity = 'o';
585	break;
586	case URPE_EVEN:
587	*parity = 'e';
588	break;
589	default:
590	*parity = 'n';
591	}
592
593	switch (lcr & URLC_URCL) {
594	case URCL_5:
595	*bits = 5;
596	break;
597	case URCL_6:
598	*bits = 6;
599	break;
600	case URCL_7:
601	*bits = 7;
602	break;
603	default:
604	*bits = 8;
605	}
606
607	*baud = port->uartclk / (UART_GET_BRDR(port) & 0x0FFF);
608	*baud /= 16;
609	*baud &= 0xFFFFFFF0;
610	}
611
612	static int __init ks8695_console_setup(struct console co, char options)
613	{
614	struct uart_port *port;
615	int baud = 115200;
616	int bits = 8;
617	int parity = 'n';
618	int flow = 'n';
619
620	/*
621	* Check whether an invalid uart number has been specified, and
622	* if so, search for the first available port that does have
623	* console support.
624	*/
625	port = uart_get_console(ks8695uart_ports, SERIAL_KS8695_NR, co);
626
627	if (options)
628	uart_parse_options(options, &baud, &parity, &bits, &flow);
629	else
630	ks8695_console_get_options(port, &baud, &parity, &bits);
631
632	return uart_set_options(port, co, baud, parity, bits, flow);
633	}
634
486cab2b	635	static struct uart_driver ks8695_reg;
2c7ee6ab AV	636
	637	static struct console ks8695_console = {
	638	.name = SERIAL_KS8695_DEVNAME,
	639	.write = ks8695_console_write,
	640	.device = uart_console_device,
	641	.setup = ks8695_console_setup,
	642	.flags = CON_PRINTBUFFER,
	643	.index = -1,
	644	.data = &ks8695_reg,
	645	};
	646
	647	static int __init ks8695_console_init(void)
	648	{
	649	register_console(&ks8695_console);
	650	return 0;
	651	}
	652
	653	console_initcall(ks8695_console_init);
	654
	655	#define KS8695_CONSOLE &ks8695_console
	656	#else
	657	#define KS8695_CONSOLE NULL
	658	#endif
	659
	660	static struct uart_driver ks8695_reg = {
	661	.owner = THIS_MODULE,
	662	.driver_name = "serial_ks8695",
	663	.dev_name = SERIAL_KS8695_DEVNAME,
	664	.major = SERIAL_KS8695_MAJOR,
	665	.minor = SERIAL_KS8695_MINOR,
	666	.nr = SERIAL_KS8695_NR,
	667	.cons = KS8695_CONSOLE,
	668	};
	669
	670	static int __init ks8695uart_init(void)
	671	{
	672	int i, ret;
	673
	674	printk(KERN_INFO "Serial: Micrel KS8695 UART driver\n");
	675
	676	ret = uart_register_driver(&ks8695_reg);
	677	if (ret)
	678	return ret;
	679
	680	for (i = 0; i < SERIAL_KS8695_NR; i++)
	681	uart_add_one_port(&ks8695_reg, &ks8695uart_ports[0]);
	682
	683	return 0;
	684	}
	685
	686	static void __exit ks8695uart_exit(void)
	687	{
	688	int i;
	689
	690	for (i = 0; i < SERIAL_KS8695_NR; i++)
	691	uart_remove_one_port(&ks8695_reg, &ks8695uart_ports[0]);
	692	uart_unregister_driver(&ks8695_reg);
	693	}
	694
	695	module_init(ks8695uart_init);
	696	module_exit(ks8695uart_exit);
	697
	698	MODULE_DESCRIPTION("KS8695 serial port driver");
	699	MODULE_AUTHOR("Micrel Inc.");
700	MODULE_LICENSE("GPL");