serial_clps711x.c

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	clps_writel(ubrlcr, UBRLCR(port));
}

static void clps711xuart_change_speed(struct uart_port *port, u_int cflag, u_int iflag, u_int quot)
{
	u_int ubrlcr;
	unsigned long flags;

#if DEBUG
	printk("clps711xuart_change_speed(cflag=0x%x, iflag=0x%x, quot=%d) called\n",
		cflag, iflag, quot);
#endif
	/* byte size and parity */
	switch (cflag & CSIZE) {
	case CS5: ubrlcr = UBRLCR_WRDLEN5; break;
	case CS6: ubrlcr = UBRLCR_WRDLEN6; break;
	case CS7: ubrlcr = UBRLCR_WRDLEN7; break;
	default:  ubrlcr = UBRLCR_WRDLEN8; break; // CS8
	}
	if (cflag & CSTOPB)
		ubrlcr |= UBRLCR_XSTOP;
	if (cflag & PARENB) {
		ubrlcr |= UBRLCR_PRTEN;
		if (!(cflag & PARODD))
			ubrlcr |= UBRLCR_EVENPRT;
	}
	if (port->fifosize > 1)
		ubrlcr |= UBRLCR_FIFOEN;

	port->read_status_mask = UARTDR_OVERR;
	if (iflag & INPCK)
		port->read_status_mask |= UARTDR_PARERR | UARTDR_FRMERR;
//	if (iflag & (BRKINT | PARMRK))
//		port->read_status_mask |= AMBA_UARTRSR_BE;

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

	quot -= 1;

	/* first, disable everything */
	save_flags(flags); cli();

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

	restore_flags(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,
	change_speed:	clps711xuart_change_speed,
	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,
		flags:		ASYNC_BOOT_AUTOCONF,
	},
	{
		iobase:		SYSCON2,
		irq:		IRQ_UTXINT2, /* IRQ_URXINT2 */
		uartclk:	3686400,
		fifosize:	16,
		ops:		&clps711x_pops,
		flags:		ASYNC_BOOT_AUTOCONF,
	}
};

#ifdef CONFIG_SERIAL_CLPS711X_CONSOLE

#ifdef used_and_not_const_char_pointer
/*
 * This code is currently never used; console->read is never called.
 * Therefore, although we have an implementation, we don't use it.
 * FIXME: the "const char *s" should be fixed to "char *s" some day.
 * (when the definition in include/linux/console.h is also fixed)
 */
static int clps711xuart_console_read(struct uart_port *port, char *s, u_int count)
{
	u_int status;
	int c;
#if DEBUG
	printk("clps711xuart_console_read() called\n");
#endif

	c = 0;
	while (c < count) {
		status = clps_readl(SYSFLG(port));
		if (status & SYSFLG_URXFE) {
			// nothing more to get, return
			return c;
		} else {
			*s++ = clps_readl(UARTDR(port));
			c++;
		}
	}
	// return the count
	return c;
}
#endif

/*
 *	Print a string to the serial port trying not to disturb
 *	any possible real use of the port...
 *
 *	The console_lock must be held when we get here.
 *
 *	Note that this is called with interrupts already disabled
 */
static void clps711xuart_console_write(struct console *co, const char *s, u_int count)
{
	struct uart_port *port = clps711x_ports + co->index;
	unsigned int status, syscon;
	int i;

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

	/*
	 *	Now, do each character
	 */
	for (i = 0; i < count; i++) {
		do {
			status = clps_readl(SYSFLG(port));
		} while (status & SYSFLG_UTXFF);
		clps_writel(s[i], UARTDR(port));
		if (s[i] == '\n') {
			do {
				status = clps_readl(SYSFLG(port));
			} while (status & SYSFLG_UTXFF);
			clps_writel('\r', UARTDR(port));
		}
	}

	/*
	 *	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 kdev_t clps711xuart_console_device(struct console *co)
{
	return MKDEV(SERIAL_CLPS711X_MAJOR, SERIAL_CLPS711X_MINOR + co->index);
}

/*
 *	Receive character from the serial port
 *	  what about interrupts?
 */
static int clps711xuart_console_wait_key(struct console *co)
{
	struct uart_port *port = clps711x_ports + co->index;
	u_int status, syscon, ch;

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

	do {
		status = clps_readl(SYSFLG(port));
	} while (status & SYSFLG_URXFE);
	ch = clps_readl(UARTDR(port)) & 0xff;

	clps_writel(syscon, SYSCON(port));

	return ch;
}

static void __init
clps711xuart_console_get_options(struct uart_port *port, int *baud, int *parity, int *bits)
{
	if (clps_readl(SYSCON(port)) & SYSCON_UARTEN) {
		u_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 console clps711x_console = {
	name:		SERIAL_CLPS711X_NAME,
	write:		clps711xuart_console_write,
#ifdef used_and_not_const_char_pointer
	read:		clps711xuart_console_read,
#endif
	device:		clps711xuart_console_device,
	wait_key:	clps711xuart_console_wait_key,
	setup:		clps711xuart_console_setup,
	flags:		CON_PRINTBUFFER,
	index:		-1,
};

void __init clps711xuart_console_init(void)
{
	register_console(&clps711x_console);
}

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

static struct uart_driver clps711x_reg = {
#ifdef CONFIG_DEVFS_FS
	normal_name:		SERIAL_CLPS711X_NAME,
	callout_name:		CALLOUT_CLPS711X_NAME,
#else
	normal_name:		SERIAL_CLPS711X_NAME,
	callout_name:		CALLOUT_CLPS711X_NAME,
#endif

	normal_major:		SERIAL_CLPS711X_MAJOR,
	normal_driver:		&normal,
	callout_major:		CALLOUT_CLPS711X_MAJOR,
	callout_driver:		&callout,

	table:			clps711x_table,
	termios:		clps711x_termios,
	termios_locked:		clps711x_termios_locked,

	minor:			SERIAL_CLPS711X_MINOR,
	nr:			UART_NR,

	port:			clps711x_ports,
	cons:			CLPS711X_CONSOLE,
};

static int __init clps711xuart_init(void)
{
	return uart_register_driver(&clps711x_reg);
}

static void __exit clps711xuart_exit(void)
{
	uart_unregister_driver(&clps711x_reg);
}

module_init(clps711xuart_init);
module_exit(clps711xuart_exit);

EXPORT_NO_SYMBOLS;

MODULE_AUTHOR("Deep Blue Solutions Ltd");
MODULE_DESCRIPTION("CLPS-711x generic serial driver");
MODULE_LICENSE("GPL");