[linux.git] / drivers / serial / netx-serial.c

/*
 * drivers/serial/netx-serial.c
 *
 * Copyright (c) 2005 Sascha Hauer <[email protected]>, Pengutronix
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

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

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

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/hardware.h>
#include <asm/arch/netx-regs.h>

/* We've been assigned a range on the "Low-density serial ports" major */
#define SERIAL_NX_MAJOR	204
#define MINOR_START	170

#ifdef CONFIG_SERIAL_NETX_CONSOLE

enum uart_regs {
	UART_DR              = 0x00,
	UART_SR              = 0x04,
	UART_LINE_CR         = 0x08,
	UART_BAUDDIV_MSB     = 0x0c,
	UART_BAUDDIV_LSB     = 0x10,
	UART_CR              = 0x14,
	UART_FR              = 0x18,
	UART_IIR             = 0x1c,
	UART_ILPR            = 0x20,
	UART_RTS_CR          = 0x24,
	UART_RTS_LEAD        = 0x28,
	UART_RTS_TRAIL       = 0x2c,
	UART_DRV_ENABLE      = 0x30,
	UART_BRM_CR          = 0x34,
	UART_RXFIFO_IRQLEVEL = 0x38,
	UART_TXFIFO_IRQLEVEL = 0x3c,
};

#define SR_FE (1<<0)
#define SR_PE (1<<1)
#define SR_BE (1<<2)
#define SR_OE (1<<3)

#define LINE_CR_BRK       (1<<0)
#define LINE_CR_PEN       (1<<1)
#define LINE_CR_EPS       (1<<2)
#define LINE_CR_STP2      (1<<3)
#define LINE_CR_FEN       (1<<4)
#define LINE_CR_5BIT      (0<<5)
#define LINE_CR_6BIT      (1<<5)
#define LINE_CR_7BIT      (2<<5)
#define LINE_CR_8BIT      (3<<5)
#define LINE_CR_BITS_MASK (3<<5)

#define CR_UART_EN (1<<0)
#define CR_SIREN   (1<<1)
#define CR_SIRLP   (1<<2)
#define CR_MSIE    (1<<3)
#define CR_RIE     (1<<4)
#define CR_TIE     (1<<5)
#define CR_RTIE    (1<<6)
#define CR_LBE     (1<<7)

#define FR_CTS  (1<<0)
#define FR_DSR  (1<<1)
#define FR_DCD  (1<<2)
#define FR_BUSY (1<<3)
#define FR_RXFE (1<<4)
#define FR_TXFF (1<<5)
#define FR_RXFF (1<<6)
#define FR_TXFE (1<<7)

#define IIR_MIS (1<<0)
#define IIR_RIS (1<<1)
#define IIR_TIS (1<<2)
#define IIR_RTIS (1<<3)
#define IIR_MASK 0xf

#define RTS_CR_AUTO (1<<0)
#define RTS_CR_RTS  (1<<1)
#define RTS_CR_COUNT (1<<2)
#define RTS_CR_MOD2  (1<<3)
#define RTS_CR_RTS_POL (1<<4)
#define RTS_CR_CTS_CTR (1<<5)
#define RTS_CR_CTS_POL (1<<6)
#define RTS_CR_STICK   (1<<7)

#define UART_PORT_SIZE 0x40
#define DRIVER_NAME "netx-uart"

struct netx_port {
	struct uart_port	port;
};

static void netx_stop_tx(struct uart_port *port)
{
	unsigned int val;
	val = readl(port->membase + UART_CR);
	writel(val & ~CR_TIE,  port->membase + UART_CR);
}

static void netx_stop_rx(struct uart_port *port)
{
	unsigned int val;
	val = readl(port->membase + UART_CR);
	writel(val & ~CR_RIE,  port->membase + UART_CR);
}

static void netx_enable_ms(struct uart_port *port)
{
	unsigned int val;
	val = readl(port->membase + UART_CR);
	writel(val | CR_MSIE, port->membase + UART_CR);
}

static inline void netx_transmit_buffer(struct uart_port *port)
{
	struct circ_buf *xmit = &port->info->xmit;

	if (port->x_char) {
		writel(port->x_char, port->membase + UART_DR);
		port->icount.tx++;
		port->x_char = 0;
		return;
	}

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

	do {
		/* send xmit->buf[xmit->tail]
		 * out the port here */
		writel(xmit->buf[xmit->tail], port->membase + UART_DR);
		xmit->tail = (xmit->tail + 1) &
		         (UART_XMIT_SIZE - 1);
		port->icount.tx++;
		if (uart_circ_empty(xmit))
			break;
	} while (!(readl(port->membase + UART_FR) & FR_TXFF));

	if (uart_circ_empty(xmit))
		netx_stop_tx(port);
}

static void netx_start_tx(struct uart_port *port)
{
	writel(
	    readl(port->membase + UART_CR) | CR_TIE, port->membase + UART_CR);

	if (!(readl(port->membase + UART_FR) & FR_TXFF))
		netx_transmit_buffer(port);
}

static unsigned int netx_tx_empty(struct uart_port *port)
{
	return readl(port->membase + UART_FR) & FR_BUSY ? 0 : TIOCSER_TEMT;
}

static void netx_txint(struct uart_port *port)
{
	struct circ_buf *xmit = &port->info->xmit;

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

	netx_transmit_buffer(port);

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

static void netx_rxint(struct uart_port *port)
{
	unsigned char rx, flg, status;
	struct tty_struct *tty = port->info->tty;

	while (!(readl(port->membase + UART_FR) & FR_RXFE)) {
		rx = readl(port->membase + UART_DR);
		flg = TTY_NORMAL;
		port->icount.rx++;
		status = readl(port->membase + UART_SR);
		if (status & SR_BE) {
			writel(0, port->membase + UART_SR);
			if (uart_handle_break(port))
				continue;
		}

		if (unlikely(status & (SR_FE | SR_PE | SR_OE))) {

			if (status & SR_PE)
				port->icount.parity++;
			else if (status & SR_FE)
				port->icount.frame++;
			if (status & SR_OE)
				port->icount.overrun++;

			status &= port->read_status_mask;

			if (status & SR_BE)
				flg = TTY_BREAK;
			else if (status & SR_PE)
				flg = TTY_PARITY;
			else if (status & SR_FE)
				flg = TTY_FRAME;
		}

		if (uart_handle_sysrq_char(port, rx))
			continue;

		uart_insert_char(port, status, SR_OE, rx, flg);
	}

	tty_flip_buffer_push(tty);
	return;
}

static irqreturn_t netx_int(int irq, void *dev_id)
{
	struct uart_port *port = dev_id;
	unsigned long flags;
	unsigned char status;

	spin_lock_irqsave(&port->lock,flags);

	status = readl(port->membase + UART_IIR) & IIR_MASK;
	while (status) {
		if (status & IIR_RIS)
			netx_rxint(port);
		if (status & IIR_TIS)
			netx_txint(port);
		if (status & IIR_MIS) {
			if (readl(port->membase + UART_FR) & FR_CTS)
				uart_handle_cts_change(port, 1);
			else
				uart_handle_cts_change(port, 0);
		}
		writel(0, port->membase + UART_IIR);
		status = readl(port->membase + UART_IIR) & IIR_MASK;
	}

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

static unsigned int netx_get_mctrl(struct uart_port *port)
{
	unsigned int ret = TIOCM_DSR | TIOCM_CAR;

	if (readl(port->membase + UART_FR) & FR_CTS)
		ret |= TIOCM_CTS;

	return ret;
}

static void netx_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
	unsigned int val;

	if (mctrl & TIOCM_RTS) {
		val = readl(port->membase + UART_RTS_CR);
		writel(val | RTS_CR_RTS, port->membase + UART_RTS_CR);
	}
}

static void netx_break_ctl(struct uart_port *port, int break_state)
{
	unsigned int line_cr;
	spin_lock_irq(&port->lock);

	line_cr = readl(port->membase + UART_LINE_CR);
	if (break_state != 0)
		line_cr |= LINE_CR_BRK;
	else
		line_cr &= ~LINE_CR_BRK;
	writel(line_cr, port->membase + UART_LINE_CR);

	spin_unlock_irq(&port->lock);
}

static int netx_startup(struct uart_port *port)
{
	int ret;

	ret = request_irq(port->irq, netx_int, 0,
			     DRIVER_NAME, port);
	if (ret) {
		dev_err(port->dev, "unable to grab irq%d\n",port->irq);
		goto exit;
	}

	writel(readl(port->membase + UART_LINE_CR) | LINE_CR_FEN,
		port->membase + UART_LINE_CR);

	writel(CR_MSIE | CR_RIE | CR_TIE | CR_RTIE | CR_UART_EN,
		port->membase + UART_CR);

exit:
	return ret;
}

static void netx_shutdown(struct uart_port *port)
{
	writel(0, port->membase + UART_CR) ;

	free_irq(port->irq, port);
}

static void
netx_set_termios(struct uart_port *port, struct ktermios *termios,
		   struct ktermios *old)
{
	unsigned int baud, quot;
	unsigned char old_cr;
	unsigned char line_cr = LINE_CR_FEN;
	unsigned char rts_cr = 0;

	switch (termios->c_cflag & CSIZE) {
	case CS5:
		line_cr |= LINE_CR_5BIT;
		break;
	case CS6:
		line_cr |= LINE_CR_6BIT;
		break;
	case CS7:
		line_cr |= LINE_CR_7BIT;
		break;
	case CS8:
		line_cr |= LINE_CR_8BIT;
		break;
	}

	if (termios->c_cflag & CSTOPB)
		line_cr |= LINE_CR_STP2;

	if (termios->c_cflag & PARENB) {
		line_cr |= LINE_CR_PEN;
		if (!(termios->c_cflag & PARODD))
			line_cr |= LINE_CR_EPS;
	}

	if (termios->c_cflag & CRTSCTS)
		rts_cr = RTS_CR_AUTO | RTS_CR_CTS_CTR | RTS_CR_RTS_POL;

	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
	quot = baud * 4096;
	quot /= 1000;
	quot *= 256;
	quot /= 100000;

	spin_lock_irq(&port->lock);

	uart_update_timeout(port, termios->c_cflag, baud);

	old_cr = readl(port->membase + UART_CR);

	/* disable interrupts */
	writel(old_cr & ~(CR_MSIE | CR_RIE | CR_TIE | CR_RTIE),
		port->membase + UART_CR);

	/* drain transmitter */
	while (readl(port->membase + UART_FR) & FR_BUSY);

	/* disable UART */
	writel(old_cr & ~CR_UART_EN, port->membase + UART_CR);

	/* modem status interrupts */
	old_cr &= ~CR_MSIE;
	if (UART_ENABLE_MS(port, termios->c_cflag))
		old_cr |= CR_MSIE;

	writel((quot>>8) & 0xff, port->membase + UART_BAUDDIV_MSB);
	writel(quot & 0xff, port->membase + UART_BAUDDIV_LSB);
	writel(line_cr, port->membase + UART_LINE_CR);

	writel(rts_cr, port->membase + UART_RTS_CR);

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

	port->read_status_mask = 0;
	if (termios->c_iflag & (BRKINT | PARMRK))
		port->read_status_mask |= SR_BE;
	if (termios->c_iflag & INPCK)
		port->read_status_mask |= SR_PE | SR_FE;

	writel(old_cr, port->membase + UART_CR);

	spin_unlock_irq(&port->lock);
}

static const char *netx_type(struct uart_port *port)
{
	return port->type == PORT_NETX ? "NETX" : NULL;
}

static void netx_release_port(struct uart_port *port)
{
	release_mem_region(port->mapbase, UART_PORT_SIZE);
}

static int netx_request_port(struct uart_port *port)
{
	return request_mem_region(port->mapbase, UART_PORT_SIZE,
			DRIVER_NAME) != NULL ? 0 : -EBUSY;
}

static void netx_config_port(struct uart_port *port, int flags)
{
	if (flags & UART_CONFIG_TYPE && netx_request_port(port) == 0)
		port->type = PORT_NETX;
}

static int
netx_verify_port(struct uart_port *port, struct serial_struct *ser)
{
	int ret = 0;

	if (ser->type != PORT_UNKNOWN && ser->type != PORT_NETX)
		ret = -EINVAL;

	return ret;
}

static struct uart_ops netx_pops = {
	.tx_empty	= netx_tx_empty,
	.set_mctrl	= netx_set_mctrl,
	.get_mctrl	= netx_get_mctrl,
	.stop_tx	= netx_stop_tx,
	.start_tx	= netx_start_tx,
	.stop_rx	= netx_stop_rx,
	.enable_ms	= netx_enable_ms,
	.break_ctl	= netx_break_ctl,
	.startup	= netx_startup,
	.shutdown	= netx_shutdown,
	.set_termios	= netx_set_termios,
	.type		= netx_type,
	.release_port	= netx_release_port,
	.request_port	= netx_request_port,
	.config_port	= netx_config_port,
	.verify_port	= netx_verify_port,
};

static struct netx_port netx_ports[] = {
	{
	.port = {
		.type = PORT_NETX,
		.iotype = UPIO_MEM,
		.membase = (char __iomem *)io_p2v(NETX_PA_UART0),
		.mapbase = NETX_PA_UART0,
		.irq = NETX_IRQ_UART0,
		.uartclk = 100000000,
		.fifosize = 16,
		.flags = UPF_BOOT_AUTOCONF,
		.ops = &netx_pops,
		.line = 0,
	},
	}, {
	.port = {
		.type = PORT_NETX,
		.iotype = UPIO_MEM,
		.membase = (char __iomem *)io_p2v(NETX_PA_UART1),
		.mapbase = NETX_PA_UART1,
		.irq = NETX_IRQ_UART1,
		.uartclk = 100000000,
		.fifosize = 16,
		.flags = UPF_BOOT_AUTOCONF,
		.ops = &netx_pops,
		.line = 1,
	},
	}, {
	.port = {
		.type = PORT_NETX,
		.iotype = UPIO_MEM,
		.membase = (char __iomem *)io_p2v(NETX_PA_UART2),
		.mapbase = NETX_PA_UART2,
		.irq = NETX_IRQ_UART2,
		.uartclk = 100000000,
		.fifosize = 16,
		.flags = UPF_BOOT_AUTOCONF,
		.ops = &netx_pops,
		.line = 2,
	},
	}
};

static void netx_console_putchar(struct uart_port *port, int ch)
{
	while (readl(port->membase + UART_FR) & FR_BUSY);
	writel(ch, port->membase + UART_DR);
}

static void
netx_console_write(struct console *co, const char *s, unsigned int count)
{
	struct uart_port *port = &netx_ports[co->index].port;
	unsigned char cr_save;

	cr_save = readl(port->membase + UART_CR);
	writel(cr_save | CR_UART_EN, port->membase + UART_CR);

	uart_console_write(port, s, count, netx_console_putchar);

	while (readl(port->membase + UART_FR) & FR_BUSY);
	writel(cr_save, port->membase + UART_CR);
}

static void __init
netx_console_get_options(struct uart_port *port, int *baud,
			int *parity, int *bits, int *flow)
{
	unsigned char line_cr;

	*baud = (readl(port->membase + UART_BAUDDIV_MSB) << 8) |
		readl(port->membase + UART_BAUDDIV_LSB);
	*baud *= 1000;
	*baud /= 4096;
	*baud *= 1000;
	*baud /= 256;
	*baud *= 100;

	line_cr = readl(port->membase + UART_LINE_CR);
	*parity = 'n';
	if (line_cr & LINE_CR_PEN) {
		if (line_cr & LINE_CR_EPS)
			*parity = 'e';
		else
			*parity = 'o';
	}

	switch (line_cr & LINE_CR_BITS_MASK) {
	case LINE_CR_8BIT:
		*bits = 8;
		break;
	case LINE_CR_7BIT:
		*bits = 7;
		break;
	case LINE_CR_6BIT:
		*bits = 6;
		break;
	case LINE_CR_5BIT:
		*bits = 5;
		break;
	}

	if (readl(port->membase + UART_RTS_CR) & RTS_CR_AUTO)
		*flow = 'r';
}

static int __init
netx_console_setup(struct console *co, char *options)
{
	struct netx_port *sport;
	int baud = 9600;
	int bits = 8;
	int parity = 'n';
	int flow = 'n';

	/*
	 * Check whether an invalid uart number has been specified, and
	 * if so, search for the first available port that does have
	 * console support.
	 */
	if (co->index == -1 || co->index >= ARRAY_SIZE(netx_ports))
		co->index = 0;
	sport = &netx_ports[co->index];

	if (options) {
		uart_parse_options(options, &baud, &parity, &bits, &flow);
	} else {
		/* if the UART is enabled, assume it has been correctly setup
		 * by the bootloader and get the options
		 */
		if (readl(sport->port.membase + UART_CR) & CR_UART_EN) {
			netx_console_get_options(&sport->port, &baud,
			&parity, &bits, &flow);
		}

	}

	return uart_set_options(&sport->port, co, baud, parity, bits, flow);
}

static struct uart_driver netx_reg;
static struct console netx_console = {
	.name		= "ttyNX",
	.write		= netx_console_write,
	.device		= uart_console_device,
	.setup		= netx_console_setup,
	.flags		= CON_PRINTBUFFER,
	.index		= -1,
	.data		= &netx_reg,
};

static int __init netx_console_init(void)
{
	register_console(&netx_console);
	return 0;
}
console_initcall(netx_console_init);

#define NETX_CONSOLE	&netx_console
#else
#define NETX_CONSOLE	NULL
#endif

static struct uart_driver netx_reg = {
	.owner          = THIS_MODULE,
	.driver_name    = DRIVER_NAME,
	.dev_name       = "ttyNX",
	.major          = SERIAL_NX_MAJOR,
	.minor          = MINOR_START,
	.nr             = ARRAY_SIZE(netx_ports),
	.cons           = NETX_CONSOLE,
};

static int serial_netx_suspend(struct platform_device *pdev, pm_message_t state)
{
	struct netx_port *sport = platform_get_drvdata(pdev);

	if (sport)
		uart_suspend_port(&netx_reg, &sport->port);

	return 0;
}

static int serial_netx_resume(struct platform_device *pdev)
{
	struct netx_port *sport = platform_get_drvdata(pdev);

	if (sport)
		uart_resume_port(&netx_reg, &sport->port);

	return 0;
}

static int serial_netx_probe(struct platform_device *pdev)
{
	struct uart_port *port = &netx_ports[pdev->id].port;

	dev_info(&pdev->dev, "initialising\n");

	port->dev = &pdev->dev;

	writel(1, port->membase + UART_RXFIFO_IRQLEVEL);
	uart_add_one_port(&netx_reg, &netx_ports[pdev->id].port);
	platform_set_drvdata(pdev, &netx_ports[pdev->id]);

	return 0;
}

static int serial_netx_remove(struct platform_device *pdev)
{
	struct netx_port *sport = platform_get_drvdata(pdev);

	platform_set_drvdata(pdev, NULL);

	if (sport)
		uart_remove_one_port(&netx_reg, &sport->port);

	return 0;
}

static struct platform_driver serial_netx_driver = {
	.probe          = serial_netx_probe,
	.remove         = serial_netx_remove,

	.suspend	= serial_netx_suspend,
	.resume		= serial_netx_resume,

	.driver		= {
		.name   = DRIVER_NAME,
	},
};

static int __init netx_serial_init(void)
{
	int ret;

	printk(KERN_INFO "Serial: NetX driver\n");

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

	ret = platform_driver_register(&serial_netx_driver);
	if (ret != 0)
		uart_unregister_driver(&netx_reg);

	return 0;
}

static void __exit netx_serial_exit(void)
{
	platform_driver_unregister(&serial_netx_driver);
	uart_unregister_driver(&netx_reg);
}

module_init(netx_serial_init);
module_exit(netx_serial_exit);

MODULE_AUTHOR("Sascha Hauer");
MODULE_DESCRIPTION("NetX serial port driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
f8441e13 SH	1	/*
	2	* drivers/serial/netx-serial.c
	3	*
	4	* Copyright (c) 2005 Sascha Hauer <[email protected]>, Pengutronix
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2
	8	* as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	18	*/
	19
f8441e13 SH	20	#if defined(CONFIG_SERIAL_NETX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
	21	#define SUPPORT_SYSRQ
	22	#endif
	23
	24	#include <linux/device.h>
	25	#include <linux/module.h>
	26	#include <linux/ioport.h>
	27	#include <linux/init.h>
	28	#include <linux/console.h>
	29	#include <linux/sysrq.h>
	30	#include <linux/platform_device.h>
	31	#include <linux/tty.h>
	32	#include <linux/tty_flip.h>
	33	#include <linux/serial_core.h>
	34	#include <linux/serial.h>
	35
	36	#include <asm/io.h>
	37	#include <asm/irq.h>
	38	#include <asm/hardware.h>
	39	#include <asm/arch/netx-regs.h>
	40
	41	/* We've been assigned a range on the "Low-density serial ports" major */
	42	#define SERIAL_NX_MAJOR 204
	43	#define MINOR_START 170
	44
	45	#ifdef CONFIG_SERIAL_NETX_CONSOLE
	46
	47	enum uart_regs {
	48	UART_DR = 0x00,
	49	UART_SR = 0x04,
	50	UART_LINE_CR = 0x08,
	51	UART_BAUDDIV_MSB = 0x0c,
	52	UART_BAUDDIV_LSB = 0x10,
	53	UART_CR = 0x14,
	54	UART_FR = 0x18,
	55	UART_IIR = 0x1c,
	56	UART_ILPR = 0x20,
	57	UART_RTS_CR = 0x24,
	58	UART_RTS_LEAD = 0x28,
	59	UART_RTS_TRAIL = 0x2c,
	60	UART_DRV_ENABLE = 0x30,
	61	UART_BRM_CR = 0x34,
	62	UART_RXFIFO_IRQLEVEL = 0x38,
	63	UART_TXFIFO_IRQLEVEL = 0x3c,
	64	};
	65
	66	#define SR_FE (1<<0)
	67	#define SR_PE (1<<1)
	68	#define SR_BE (1<<2)
	69	#define SR_OE (1<<3)
	70
	71	#define LINE_CR_BRK (1<<0)
	72	#define LINE_CR_PEN (1<<1)
	73	#define LINE_CR_EPS (1<<2)
	74	#define LINE_CR_STP2 (1<<3)
	75	#define LINE_CR_FEN (1<<4)
	76	#define LINE_CR_5BIT (0<<5)
	77	#define LINE_CR_6BIT (1<<5)
	78	#define LINE_CR_7BIT (2<<5)
	79	#define LINE_CR_8BIT (3<<5)
	80	#define LINE_CR_BITS_MASK (3<<5)
	81
	82	#define CR_UART_EN (1<<0)
	83	#define CR_SIREN (1<<1)
84	#define CR_SIRLP (1<<2)
85	#define CR_MSIE (1<<3)
86	#define CR_RIE (1<<4)
87	#define CR_TIE (1<<5)
88	#define CR_RTIE (1<<6)
89	#define CR_LBE (1<<7)
90
91	#define FR_CTS (1<<0)
92	#define FR_DSR (1<<1)
93	#define FR_DCD (1<<2)
94	#define FR_BUSY (1<<3)
95	#define FR_RXFE (1<<4)
96	#define FR_TXFF (1<<5)
97	#define FR_RXFF (1<<6)
98	#define FR_TXFE (1<<7)
99
100	#define IIR_MIS (1<<0)
101	#define IIR_RIS (1<<1)
102	#define IIR_TIS (1<<2)
103	#define IIR_RTIS (1<<3)
104	#define IIR_MASK 0xf
105
106	#define RTS_CR_AUTO (1<<0)
107	#define RTS_CR_RTS (1<<1)
108	#define RTS_CR_COUNT (1<<2)
109	#define RTS_CR_MOD2 (1<<3)
110	#define RTS_CR_RTS_POL (1<<4)
111	#define RTS_CR_CTS_CTR (1<<5)
112	#define RTS_CR_CTS_POL (1<<6)
113	#define RTS_CR_STICK (1<<7)
114
115	#define UART_PORT_SIZE 0x40
116	#define DRIVER_NAME "netx-uart"
117
118	struct netx_port {
119	struct uart_port port;
120	};
121
122	static void netx_stop_tx(struct uart_port *port)
123	{
124	unsigned int val;
125	val = readl(port->membase + UART_CR);
126	writel(val & ~CR_TIE, port->membase + UART_CR);
127	}
128
129	static void netx_stop_rx(struct uart_port *port)
130	{
131	unsigned int val;
132	val = readl(port->membase + UART_CR);
133	writel(val & ~CR_RIE, port->membase + UART_CR);
134	}
135
136	static void netx_enable_ms(struct uart_port *port)
137	{
138	unsigned int val;
139	val = readl(port->membase + UART_CR);
140	writel(val \| CR_MSIE, port->membase + UART_CR);
141	}
142
143	static inline void netx_transmit_buffer(struct uart_port *port)
144	{
145	struct circ_buf *xmit = &port->info->xmit;
146
147	if (port->x_char) {
148	writel(port->x_char, port->membase + UART_DR);
149	port->icount.tx++;
150	port->x_char = 0;
151	return;
152	}
153
154	if (uart_tx_stopped(port) \|\| uart_circ_empty(xmit)) {
155	netx_stop_tx(port);
156	return;
157	}
158
159	do {
160	/* send xmit->buf[xmit->tail]
161	* out the port here */
162	writel(xmit->buf[xmit->tail], port->membase + UART_DR);
163	xmit->tail = (xmit->tail + 1) &
164	(UART_XMIT_SIZE - 1);
165	port->icount.tx++;
166	if (uart_circ_empty(xmit))
167	break;
168	} while (!(readl(port->membase + UART_FR) & FR_TXFF));
169
170	if (uart_circ_empty(xmit))
171	netx_stop_tx(port);
172	}
173
174	static void netx_start_tx(struct uart_port *port)
175	{
176	writel(
177	readl(port->membase + UART_CR) \| CR_TIE, port->membase + UART_CR);
178
179	if (!(readl(port->membase + UART_FR) & FR_TXFF))
180	netx_transmit_buffer(port);
181	}
182
183	static unsigned int netx_tx_empty(struct uart_port *port)
184	{
185	return readl(port->membase + UART_FR) & FR_BUSY ? 0 : TIOCSER_TEMT;
186	}
187
188	static void netx_txint(struct uart_port *port)
189	{
190	struct circ_buf *xmit = &port->info->xmit;
191
192	if (uart_circ_empty(xmit) \|\| uart_tx_stopped(port)) {
193	netx_stop_tx(port);
194	return;
195	}
196
197	netx_transmit_buffer(port);
198
199	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
200	uart_write_wakeup(port);
201	}
202
7d12e780	203	static void netx_rxint(struct uart_port *port)
f8441e13 SH	204	{
	205	unsigned char rx, flg, status;
	206	struct tty_struct *tty = port->info->tty;
	207
	208	while (!(readl(port->membase + UART_FR) & FR_RXFE)) {
	209	rx = readl(port->membase + UART_DR);
	210	flg = TTY_NORMAL;
	211	port->icount.rx++;
	212	status = readl(port->membase + UART_SR);
	213	if (status & SR_BE) {
	214	writel(0, port->membase + UART_SR);
	215	if (uart_handle_break(port))
	216	continue;
	217	}
	218
	219	if (unlikely(status & (SR_FE \| SR_PE \| SR_OE))) {
	220
	221	if (status & SR_PE)
	222	port->icount.parity++;
	223	else if (status & SR_FE)
	224	port->icount.frame++;
	225	if (status & SR_OE)
	226	port->icount.overrun++;
	227
	228	status &= port->read_status_mask;
	229
	230	if (status & SR_BE)
	231	flg = TTY_BREAK;
	232	else if (status & SR_PE)
	233	flg = TTY_PARITY;
	234	else if (status & SR_FE)
	235	flg = TTY_FRAME;
	236	}
	237
7d12e780	238	if (uart_handle_sysrq_char(port, rx))
f8441e13 SH	239	continue;
	240
	241	uart_insert_char(port, status, SR_OE, rx, flg);
	242	}
	243
	244	tty_flip_buffer_push(tty);
	245	return;
	246	}
	247
7d12e780	248	static irqreturn_t netx_int(int irq, void *dev_id)
f8441e13	249	{
c7bec5ab	250	struct uart_port *port = dev_id;
f8441e13 SH	251	unsigned long flags;
	252	unsigned char status;
	253
	254	spin_lock_irqsave(&port->lock,flags);
	255
	256	status = readl(port->membase + UART_IIR) & IIR_MASK;
	257	while (status) {
	258	if (status & IIR_RIS)
7d12e780	259	netx_rxint(port);
f8441e13 SH	260	if (status & IIR_TIS)
	261	netx_txint(port);
	262	if (status & IIR_MIS) {
	263	if (readl(port->membase + UART_FR) & FR_CTS)
	264	uart_handle_cts_change(port, 1);
	265	else
	266	uart_handle_cts_change(port, 0);
	267	}
	268	writel(0, port->membase + UART_IIR);
	269	status = readl(port->membase + UART_IIR) & IIR_MASK;
	270	}
	271
	272	spin_unlock_irqrestore(&port->lock,flags);
	273	return IRQ_HANDLED;
	274	}
	275
	276	static unsigned int netx_get_mctrl(struct uart_port *port)
	277	{
	278	unsigned int ret = TIOCM_DSR \| TIOCM_CAR;
	279
	280	if (readl(port->membase + UART_FR) & FR_CTS)
	281	ret \|= TIOCM_CTS;
	282
	283	return ret;
	284	}
	285
	286	static void netx_set_mctrl(struct uart_port *port, unsigned int mctrl)
	287	{
	288	unsigned int val;
	289
	290	if (mctrl & TIOCM_RTS) {
	291	val = readl(port->membase + UART_RTS_CR);
	292	writel(val \| RTS_CR_RTS, port->membase + UART_RTS_CR);
	293	}
	294	}
	295
	296	static void netx_break_ctl(struct uart_port *port, int break_state)
	297	{
	298	unsigned int line_cr;
	299	spin_lock_irq(&port->lock);
	300
	301	line_cr = readl(port->membase + UART_LINE_CR);
	302	if (break_state != 0)
	303	line_cr \|= LINE_CR_BRK;
	304	else
	305	line_cr &= ~LINE_CR_BRK;
	306	writel(line_cr, port->membase + UART_LINE_CR);
	307
	308	spin_unlock_irq(&port->lock);
	309	}
	310
	311	static int netx_startup(struct uart_port *port)
	312	{
	313	int ret;
	314
	315	ret = request_irq(port->irq, netx_int, 0,
	316	DRIVER_NAME, port);
	317	if (ret) {
	318	dev_err(port->dev, "unable to grab irq%d\n",port->irq);
	319	goto exit;
	320	}
	321
	322	writel(readl(port->membase + UART_LINE_CR) \| LINE_CR_FEN,
	323	port->membase + UART_LINE_CR);
324
325	writel(CR_MSIE \| CR_RIE \| CR_TIE \| CR_RTIE \| CR_UART_EN,
326	port->membase + UART_CR);
327
328	exit:
329	return ret;
330	}
331
332	static void netx_shutdown(struct uart_port *port)
333	{
334	writel(0, port->membase + UART_CR) ;
335
336	free_irq(port->irq, port);
337	}
338
339	static void
606d099c AC	340	netx_set_termios(struct uart_port port, struct ktermios termios,
606d099c AC	341	struct ktermios *old)
f8441e13 SH	342	{
	343	unsigned int baud, quot;
	344	unsigned char old_cr;
	345	unsigned char line_cr = LINE_CR_FEN;
	346	unsigned char rts_cr = 0;
	347
	348	switch (termios->c_cflag & CSIZE) {
	349	case CS5:
	350	line_cr \|= LINE_CR_5BIT;
	351	break;
	352	case CS6:
	353	line_cr \|= LINE_CR_6BIT;
	354	break;
	355	case CS7:
	356	line_cr \|= LINE_CR_7BIT;
	357	break;
	358	case CS8:
	359	line_cr \|= LINE_CR_8BIT;
	360	break;
	361	}
	362
	363	if (termios->c_cflag & CSTOPB)
	364	line_cr \|= LINE_CR_STP2;
	365
	366	if (termios->c_cflag & PARENB) {
	367	line_cr \|= LINE_CR_PEN;
	368	if (!(termios->c_cflag & PARODD))
	369	line_cr \|= LINE_CR_EPS;
	370	}
	371
	372	if (termios->c_cflag & CRTSCTS)
	373	rts_cr = RTS_CR_AUTO \| RTS_CR_CTS_CTR \| RTS_CR_RTS_POL;
	374
	375	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
	376	quot = baud * 4096;
	377	quot /= 1000;
	378	quot *= 256;
	379	quot /= 100000;
	380
	381	spin_lock_irq(&port->lock);
	382
	383	uart_update_timeout(port, termios->c_cflag, baud);
	384
	385	old_cr = readl(port->membase + UART_CR);
	386
	387	/* disable interrupts */
	388	writel(old_cr & ~(CR_MSIE \| CR_RIE \| CR_TIE \| CR_RTIE),
	389	port->membase + UART_CR);
	390
	391	/* drain transmitter */
	392	while (readl(port->membase + UART_FR) & FR_BUSY);
	393
	394	/* disable UART */
	395	writel(old_cr & ~CR_UART_EN, port->membase + UART_CR);
	396
	397	/* modem status interrupts */
	398	old_cr &= ~CR_MSIE;
	399	if (UART_ENABLE_MS(port, termios->c_cflag))
	400	old_cr \|= CR_MSIE;
	401
	402	writel((quot>>8) & 0xff, port->membase + UART_BAUDDIV_MSB);
	403	writel(quot & 0xff, port->membase + UART_BAUDDIV_LSB);
	404	writel(line_cr, port->membase + UART_LINE_CR);
	405
406	writel(rts_cr, port->membase + UART_RTS_CR);
407
408	/*
409	* Characters to ignore
410	*/
411	port->ignore_status_mask = 0;
412	if (termios->c_iflag & IGNPAR)
413	port->ignore_status_mask \|= SR_PE;
414	if (termios->c_iflag & IGNBRK) {
415	port->ignore_status_mask \|= SR_BE;
416	/*
417	* If we're ignoring parity and break indicators,
418	* ignore overruns too (for real raw support).
419	*/
420	if (termios->c_iflag & IGNPAR)
421	port->ignore_status_mask \|= SR_PE;
422	}
423
424	port->read_status_mask = 0;
425	if (termios->c_iflag & (BRKINT \| PARMRK))
426	port->read_status_mask \|= SR_BE;
427	if (termios->c_iflag & INPCK)
428	port->read_status_mask \|= SR_PE \| SR_FE;
429
430	writel(old_cr, port->membase + UART_CR);
431
432	spin_unlock_irq(&port->lock);
433	}
434
435	static const char netx_type(struct uart_port port)
436	{
437	return port->type == PORT_NETX ? "NETX" : NULL;
438	}
439
440	static void netx_release_port(struct uart_port *port)
441	{
442	release_mem_region(port->mapbase, UART_PORT_SIZE);
443	}
444
445	static int netx_request_port(struct uart_port *port)
446	{
447	return request_mem_region(port->mapbase, UART_PORT_SIZE,
448	DRIVER_NAME) != NULL ? 0 : -EBUSY;
449	}
450
451	static void netx_config_port(struct uart_port *port, int flags)
452	{
453	if (flags & UART_CONFIG_TYPE && netx_request_port(port) == 0)
454	port->type = PORT_NETX;
455	}
456
457	static int
458	netx_verify_port(struct uart_port port, struct serial_struct ser)
459	{
460	int ret = 0;
461
462	if (ser->type != PORT_UNKNOWN && ser->type != PORT_NETX)
463	ret = -EINVAL;
464
465	return ret;
466	}
467
468	static struct uart_ops netx_pops = {
469	.tx_empty = netx_tx_empty,
470	.set_mctrl = netx_set_mctrl,
471	.get_mctrl = netx_get_mctrl,
472	.stop_tx = netx_stop_tx,
473	.start_tx = netx_start_tx,
474	.stop_rx = netx_stop_rx,
475	.enable_ms = netx_enable_ms,
476	.break_ctl = netx_break_ctl,
477	.startup = netx_startup,
478	.shutdown = netx_shutdown,
479	.set_termios = netx_set_termios,
480	.type = netx_type,
481	.release_port = netx_release_port,
482	.request_port = netx_request_port,
483	.config_port = netx_config_port,
484	.verify_port = netx_verify_port,
485	};
486
487	static struct netx_port netx_ports[] = {
488	{
489	.port = {
490	.type = PORT_NETX,
491	.iotype = UPIO_MEM,
492	.membase = (char __iomem *)io_p2v(NETX_PA_UART0),
493	.mapbase = NETX_PA_UART0,
494	.irq = NETX_IRQ_UART0,
495	.uartclk = 100000000,
496	.fifosize = 16,
497	.flags = UPF_BOOT_AUTOCONF,
498	.ops = &netx_pops,
499	.line = 0,
500	},
501	}, {
502	.port = {
503	.type = PORT_NETX,
504	.iotype = UPIO_MEM,
505	.membase = (char __iomem *)io_p2v(NETX_PA_UART1),
506	.mapbase = NETX_PA_UART1,
507	.irq = NETX_IRQ_UART1,
508	.uartclk = 100000000,
509	.fifosize = 16,
510	.flags = UPF_BOOT_AUTOCONF,
511	.ops = &netx_pops,
512	.line = 1,
513	},
514	}, {
515	.port = {
516	.type = PORT_NETX,
517	.iotype = UPIO_MEM,
518	.membase = (char __iomem *)io_p2v(NETX_PA_UART2),
519	.mapbase = NETX_PA_UART2,
520	.irq = NETX_IRQ_UART2,
521	.uartclk = 100000000,
522	.fifosize = 16,
523	.flags = UPF_BOOT_AUTOCONF,
524	.ops = &netx_pops,
525	.line = 2,
526	},
527	}
528	};
529
530	static void netx_console_putchar(struct uart_port *port, int ch)
531	{
532	while (readl(port->membase + UART_FR) & FR_BUSY);
533	writel(ch, port->membase + UART_DR);
534	}
535
536	static void
537	netx_console_write(struct console co, const char s, unsigned int count)
538	{
539	struct uart_port *port = &netx_ports[co->index].port;
540	unsigned char cr_save;
541
542	cr_save = readl(port->membase + UART_CR);
543	writel(cr_save \| CR_UART_EN, port->membase + UART_CR);
544
545	uart_console_write(port, s, count, netx_console_putchar);
546
547	while (readl(port->membase + UART_FR) & FR_BUSY);
548	writel(cr_save, port->membase + UART_CR);
549	}
550
551	static void __init
552	netx_console_get_options(struct uart_port port, int baud,
553	int parity, int bits, int *flow)
554	{
555	unsigned char line_cr;
556
557	*baud = (readl(port->membase + UART_BAUDDIV_MSB) << 8) \|
558	readl(port->membase + UART_BAUDDIV_LSB);
559	baud = 1000;
560	*baud /= 4096;
561	baud = 1000;
562	*baud /= 256;
563	baud = 100;
564
565	line_cr = readl(port->membase + UART_LINE_CR);
566	*parity = 'n';
567	if (line_cr & LINE_CR_PEN) {
568	if (line_cr & LINE_CR_EPS)
569	*parity = 'e';
570	else
571	*parity = 'o';
572	}
573
574	switch (line_cr & LINE_CR_BITS_MASK) {
575	case LINE_CR_8BIT:
576	*bits = 8;
577	break;
578	case LINE_CR_7BIT:
579	*bits = 7;
580	break;
581	case LINE_CR_6BIT:
582	*bits = 6;
583	break;
584	case LINE_CR_5BIT:
585	*bits = 5;
586	break;
587	}
588
589	if (readl(port->membase + UART_RTS_CR) & RTS_CR_AUTO)
590	*flow = 'r';
591	}
592
593	static int __init
594	netx_console_setup(struct console co, char options)
595	{
596	struct netx_port *sport;
597	int baud = 9600;
598	int bits = 8;
599	int parity = 'n';
600	int flow = 'n';
601
602	/*
603	* Check whether an invalid uart number has been specified, and
604	* if so, search for the first available port that does have
605	* console support.
606	*/
607	if (co->index == -1 \|\| co->index >= ARRAY_SIZE(netx_ports))
608	co->index = 0;
609	sport = &netx_ports[co->index];
610
611	if (options) {
612	uart_parse_options(options, &baud, &parity, &bits, &flow);
613	} else {
614	/* if the UART is enabled, assume it has been correctly setup
615	* by the bootloader and get the options
616	*/
617	if (readl(sport->port.membase + UART_CR) & CR_UART_EN) {
618	netx_console_get_options(&sport->port, &baud,
619	&parity, &bits, &flow);
620	}
621
622	}
623
624	return uart_set_options(&sport->port, co, baud, parity, bits, flow);
625	}
626
627	static struct uart_driver netx_reg;
628	static struct console netx_console = {
629	.name = "ttyNX",
630	.write = netx_console_write,
631	.device = uart_console_device,
632	.setup = netx_console_setup,
633	.flags = CON_PRINTBUFFER,
634	.index = -1,
635	.data = &netx_reg,
636	};
637
638	static int __init netx_console_init(void)
639	{
640	register_console(&netx_console);
641	return 0;
642	}
643	console_initcall(netx_console_init);
644
645	#define NETX_CONSOLE &netx_console
646	#else
647	#define NETX_CONSOLE NULL
648	#endif
649
650	static struct uart_driver netx_reg = {
651	.owner = THIS_MODULE,
652	.driver_name = DRIVER_NAME,
653	.dev_name = "ttyNX",
654	.major = SERIAL_NX_MAJOR,
655	.minor = MINOR_START,
656	.nr = ARRAY_SIZE(netx_ports),
657	.cons = NETX_CONSOLE,
658	};
659
660	static int serial_netx_suspend(struct platform_device *pdev, pm_message_t state)
661	{
662	struct netx_port *sport = platform_get_drvdata(pdev);
663
664	if (sport)
665	uart_suspend_port(&netx_reg, &sport->port);
666
667	return 0;
668	}
669
670	static int serial_netx_resume(struct platform_device *pdev)
671	{
672	struct netx_port *sport = platform_get_drvdata(pdev);
673
674	if (sport)
675	uart_resume_port(&netx_reg, &sport->port);
676
677	return 0;
678	}
679
680	static int serial_netx_probe(struct platform_device *pdev)
681	{
682	struct uart_port *port = &netx_ports[pdev->id].port;
683
684	dev_info(&pdev->dev, "initialising\n");
685
686	port->dev = &pdev->dev;
687
688	writel(1, port->membase + UART_RXFIFO_IRQLEVEL);
689	uart_add_one_port(&netx_reg, &netx_ports[pdev->id].port);
690	platform_set_drvdata(pdev, &netx_ports[pdev->id]);
691
692	return 0;
693	}
694
695	static int serial_netx_remove(struct platform_device *pdev)
696	{
697	struct netx_port *sport = platform_get_drvdata(pdev);
698
699	platform_set_drvdata(pdev, NULL);
700
701	if (sport)
702	uart_remove_one_port(&netx_reg, &sport->port);
703
704	return 0;
705	}
706
707	static struct platform_driver serial_netx_driver = {
708	.probe = serial_netx_probe,
709	.remove = serial_netx_remove,
710
711	.suspend = serial_netx_suspend,
712	.resume = serial_netx_resume,
713
714	.driver = {
715	.name = DRIVER_NAME,
716	},
717	};
718
719	static int __init netx_serial_init(void)
720	{
721	int ret;
722
723	printk(KERN_INFO "Serial: NetX driver\n");
724
725	ret = uart_register_driver(&netx_reg);
726	if (ret)
727	return ret;
728
729	ret = platform_driver_register(&serial_netx_driver);
730	if (ret != 0)
731	uart_unregister_driver(&netx_reg);
732
733	return 0;
734	}
735
736	static void __exit netx_serial_exit(void)
737	{
738	platform_driver_unregister(&serial_netx_driver);
739	uart_unregister_driver(&netx_reg);
740	}
741
742	module_init(netx_serial_init);
743	module_exit(netx_serial_exit);
744
745	MODULE_AUTHOR("Sascha Hauer");
746	MODULE_DESCRIPTION("NetX serial port driver");
747	MODULE_LICENSE("GPL");