tty: move drivers/serial/ to drivers/tty/serial/

The serial drivers are really just tty drivers, so move them to
drivers/tty/ to make things a bit neater overall.

This is part of the tty/serial driver movement proceedure as proposed by
Arnd Bergmann and approved by everyone involved a number of months ago.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Rogier Wolff <R.E.Wolff@bitwizard.nl>
Cc: Michael H. Warfield <mhw@wittsend.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 579 insertions, 0 deletions

diff --git a/drivers/tty/serial/clps711x.c b/drivers/tty/serial/clps711x.c
new file mode 100644
index 00000000000..b6acd19b458
--- /dev/null
+++ b/drivers/tty/serial/clps711x.c
@@ -0,0 +1,579 @@
+/*
+ *  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
+ */
+
+#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 <linux/io.h>
+
+#include <mach/hardware.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->state->port.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->state->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 ktermios *termios,
+			 struct ktermios *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\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");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_CHARDEV(SERIAL_CLPS711X_MAJOR, SERIAL_CLPS711X_MINOR);