dz.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 828 行 · 第 1/2 页

	struct dz_port *dport = (struct dz_port *)uport;
	unsigned long flags;
	unsigned short tmp;

	/* The dz lines for the mouse/keyboard must be
	 * opened using their respective drivers.
	 */
	if ((dport->port.line == DZ_KEYBOARD) ||
	    (dport->port.line == DZ_MOUSE))
		return -ENODEV;

	spin_lock_irqsave(&dport->port.lock, flags);

	/* enable the interrupt and the scanning */
	tmp = dz_in(dport, DZ_CSR);
	tmp |= DZ_RIE | DZ_TIE | DZ_MSE;
	dz_out(dport, DZ_CSR, tmp);

	spin_unlock_irqrestore(&dport->port.lock, flags);

	return 0;
}

/* 
 * -------------------------------------------------------------------
 * shutdown ()
 *
 * This routine will shutdown a serial port; interrupts are disabled, and
 * DTR is dropped if the hangup on close termio flag is on.
 * ------------------------------------------------------------------- 
 */
static void dz_shutdown(struct uart_port *uport)
{
	dz_stop_tx(uport, 0);
}

/*
 * get_lsr_info - get line status register info
 *
 * Purpose: Let user call ioctl() to get info when the UART physically
 *          is emptied.  On bus types like RS485, the transmitter must
 *          release the bus after transmitting. This must be done when
 *          the transmit shift register is empty, not be done when the
 *          transmit holding register is empty.  This functionality
 *          allows an RS485 driver to be written in user space. 
 */
static unsigned int dz_tx_empty(struct uart_port *uport)
{
	struct dz_port *dport = (struct dz_port *)uport;
	unsigned short status = dz_in(dport, DZ_LPR);

	/* FIXME: this appears to be obviously broken --rmk. */
	return status ? TIOCSER_TEMT : 0;
}

static void dz_break_ctl(struct uart_port *uport, int break_state)
{
	struct dz_port *dport = (struct dz_port *)uport;
	unsigned long flags;
	unsigned short tmp, mask = 1 << uport->line;

	spin_lock_irqsave(&uport->lock, flags);
	tmp = dz_in(dport, DZ_TCR);
	if (break_state)
		tmp |= mask;
	else
		tmp &= ~mask;
	dz_out(dport, DZ_TCR, tmp);
	spin_unlock_irqrestore(&uport->lock, flags);
}

static void dz_set_termios(struct uart_port *uport, struct termios *termios,
			   struct termios *old_termios)
{
	struct dz_port *dport = (struct dz_port *)uport;
	unsigned long flags;
	unsigned int cflag, baud;

	cflag = dport->port.line;

	switch (termios->c_cflag & CSIZE) {
	case CS5:
		cflag |= DZ_CS5;
		break;
	case CS6:
		cflag |= DZ_CS6;
		break;
	case CS7:
		cflag |= DZ_CS7;
		break;
	case CS8:
	default:
		cflag |= DZ_CS8;
	}

	if (termios->c_cflag & CSTOPB)
		cflag |= DZ_CSTOPB;
	if (termios->c_cflag & PARENB)
		cflag |= DZ_PARENB;
	if (termios->c_cflag & PARODD)
		cflag |= DZ_PARODD;

	baud = uart_get_baud_rate(uport, termios, old_termios, 50, 9600);
	switch (baud) {
	case 50:
		cflag |= DZ_B50;
		break;
	case 75:
		cflag |= DZ_B75;
		break;
	case 110:
		cflag |= DZ_B110;
		break;
	case 134:
		cflag |= DZ_B134;
		break;
	case 150:
		cflag |= DZ_B150;
		break;
	case 300:
		cflag |= DZ_B300;
		break;
	case 600:
		cflag |= DZ_B600;
		break;
	case 1200:
		cflag |= DZ_B1200;
		break;
	case 1800:
		cflag |= DZ_B1800;
		break;
	case 2000:
		cflag |= DZ_B2000;
		break;
	case 2400:
		cflag |= DZ_B2400;
		break;
	case 3600:
		cflag |= DZ_B3600;
		break;
	case 4800:
		cflag |= DZ_B4800;
		break;
	case 7200:
		cflag |= DZ_B7200;
		break;
	case 9600:
	default:
		cflag |= DZ_B9600;
	}

	if (termios->c_cflag & CREAD)
		cflag |= DZ_RXENAB;

	spin_lock_irqsave(&dport->port.lock, flags);

	dz_out(dport, DZ_LPR, cflag);
	dport->cflag = cflag;

	/* setup accept flag */
	dport->port.read_status_mask = DZ_OERR;
	if (termios->c_iflag & INPCK)
		dport->port.read_status_mask |= DZ_FERR | DZ_PERR;

	/* characters to ignore */
	uport->ignore_status_mask = 0;
	if (termios->c_iflag & IGNPAR)
		dport->port.ignore_status_mask |= DZ_FERR | DZ_PERR;

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

static const char *dz_type(struct uart_port *port)
{
	return "DZ";
}

static void dz_release_port(struct uart_port *port)
{
	/* nothing to do */
}

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

static void dz_config_port(struct uart_port *port, int flags)
{
	if (flags & UART_CONFIG_TYPE)
		port->type = PORT_DZ;
}

/*
 * verify the new serial_struct (for TIOCSSERIAL).
 */
static int dz_verify_port(struct uart_port *port, struct serial_struct *ser)
{
	int ret = 0;
	if (ser->type != PORT_UNKNOWN && ser->type != PORT_DZ)
		ret = -EINVAL;
	if (ser->irq != port->irq)
		ret = -EINVAL;
	return ret;
}

static struct uart_ops dz_ops = {
	.tx_empty	= dz_tx_empty,
	.get_mctrl	= dz_get_mctrl,
	.set_mctrl	= dz_set_mctrl,
	.stop_tx	= dz_stop_tx,
	.start_tx	= dz_start_tx,
	.stop_rx	= dz_stop_rx,
	.enable_ms	= dz_enable_ms,
	.break_ctl	= dz_break_ctl,
	.startup	= dz_startup,
	.shutdown	= dz_shutdown,
	.set_termios	= dz_set_termios,
	.type		= dz_type,
	.release_port	= dz_release_port,
	.request_port	= dz_request_port,
	.config_port	= dz_config_port,
	.verify_port	= dz_verify_port,
};

static void __init dz_init_ports(void)
{
	static int first = 1;
	struct dz_port *dport;
	unsigned long base;
	int i;

	if (!first)
		return;
	first = 0;

	if (mips_machtype == MACH_DS23100 ||
	    mips_machtype == MACH_DS5100)
		base = (unsigned long) KN01_DZ11_BASE;
	else
		base = (unsigned long) KN02_DZ11_BASE;

	for (i = 0, dport = dz_ports; i < DZ_NB_PORT; i++, dport++) {
		spin_lock_init(&dport->port.lock);
		dport->port.membase	= (char *) base;
		dport->port.iotype	= SERIAL_IO_PORT;
		dport->port.irq		= dec_interrupt[DEC_IRQ_DZ11];
		dport->port.line	= i;
		dport->port.fifosize	= 1;
		dport->port.ops		= &dz_ops;
		dport->port.flags	= UPF_BOOT_AUTOCONF;
	}
}

static void dz_reset(struct dz_port *dport)
{
	dz_out(dport, DZ_CSR, DZ_CLR);

	while (dz_in(dport, DZ_CSR) & DZ_CLR);
		/* FIXME: cpu_relax? */

	iob();

	/* enable scanning */
	dz_out(dport, DZ_CSR, DZ_MSE);
}

#ifdef CONFIG_SERIAL_DZ_CONSOLE
static void dz_console_put_char(struct dz_port *dport, unsigned char ch)
{
	unsigned long flags;
	int loops = 2500;
	unsigned short tmp = ch;
	/* this code sends stuff out to serial device - spinning its
	   wheels and waiting. */

	spin_lock_irqsave(&dport->port.lock, flags);

	/* spin our wheels */
	while (((dz_in(dport, DZ_CSR) & DZ_TRDY) != DZ_TRDY) && loops--)
		/* FIXME: cpu_relax, udelay? --rmk */
		;

	/* Actually transmit the character. */
	dz_out(dport, DZ_TDR, tmp);

	spin_unlock_irqrestore(&dport->port.lock, flags);
}
/* 
 * -------------------------------------------------------------------
 * dz_console_print ()
 *
 * dz_console_print is registered for printk.
 * The console must be locked when we get here.
 * ------------------------------------------------------------------- 
 */
static void dz_console_print(struct console *cons,
			     const char *str,
			     unsigned int count)
{
	struct dz_port *dport = &dz_ports[CONSOLE_LINE];
#ifdef DEBUG_DZ
	prom_printf((char *) str);
#endif
	while (count--) {
		if (*str == '\n')
			dz_console_put_char(dport, '\r');
		dz_console_put_char(dport, *str++);
	}
}

static int __init dz_console_setup(struct console *co, char *options)
{
	struct dz_port *dport = &dz_ports[CONSOLE_LINE];
	int baud = 9600;
	int bits = 8;
	int parity = 'n';
	int flow = 'n';
	int ret;
	unsigned short mask, tmp;

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

	dz_reset(dport);

	ret = uart_set_options(&dport->port, co, baud, parity, bits, flow);
	if (ret == 0) {
		mask = 1 << dport->port.line;
		tmp = dz_in(dport, DZ_TCR);	/* read the TX flag */
		if (!(tmp & mask)) {
			tmp |= mask;		/* set the TX flag */
			dz_out(dport, DZ_TCR, tmp);
		}
	}

	return ret;
}

static struct console dz_sercons =
{
	.name	= "ttyS",
	.write	= dz_console_print,
	.device	= uart_console_device,
	.setup	= dz_console_setup,
	.flags	= CON_CONSDEV | CON_PRINTBUFFER,
	.index	= CONSOLE_LINE,
};

void __init dz_serial_console_init(void)
{
	dz_init_ports();

	register_console(&dz_sercons);
}

#define SERIAL_DZ_CONSOLE	&dz_sercons
#else
#define SERIAL_DZ_CONSOLE	NULL
#endif /* CONFIG_SERIAL_DZ_CONSOLE */

static struct uart_driver dz_reg = {
	.owner			= THIS_MODULE,
	.driver_name		= "serial",
#ifdef CONFIG_DEVFS
	.dev_name		= "tts/%d",
#else
	.dev_name		= "ttyS%d",
#endif
	.major			= TTY_MAJOR,
	.minor			= 64,
	.nr			= DZ_NB_PORT,
	.cons			= SERIAL_DZ_CONSOLE,
};

int __init dz_init(void)
{
	unsigned long flags;
	int ret, i;

	printk("%s%s\n", dz_name, dz_version);

	dz_init_ports();

	save_flags(flags);
	cli();

#ifndef CONFIG_SERIAL_DZ_CONSOLE
	/* reset the chip */
	dz_reset(&dz_ports[0]);
#endif

	/* order matters here... the trick is that flags
	   is updated... in request_irq - to immediatedly obliterate
	   it is unwise. */
	restore_flags(flags);

	if (request_irq(dz_ports[0].port.irq, dz_interrupt,
			SA_INTERRUPT, "DZ", &dz_ports[0]))
		panic("Unable to register DZ interrupt");

	ret = uart_register_driver(&dz_reg);
	if (ret != 0)
		return ret;

	for (i = 0; i < DZ_NB_PORT; i++)
		uart_add_one_port(&dz_reg, &dz_ports[i].port);

	return ret;
}

MODULE_DESCRIPTION("DECstation DZ serial driver");
MODULE_LICENSE("GPL");