amba-pl010.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 827 行 · 第 1/2 页

}

static void
pl010_set_termios(struct uart_port *port, struct termios *termios,
		     struct termios *old)
{
	unsigned int lcr_h, old_cr;
	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_h = UART01x_LCRH_WLEN_5;
		break;
	case CS6:
		lcr_h = UART01x_LCRH_WLEN_6;
		break;
	case CS7:
		lcr_h = UART01x_LCRH_WLEN_7;
		break;
	default: // CS8
		lcr_h = UART01x_LCRH_WLEN_8;
		break;
	}
	if (termios->c_cflag & CSTOPB)
		lcr_h |= UART01x_LCRH_STP2;
	if (termios->c_cflag & PARENB) {
		lcr_h |= UART01x_LCRH_PEN;
		if (!(termios->c_cflag & PARODD))
			lcr_h |= UART01x_LCRH_EPS;
	}
	if (port->fifosize > 1)
		lcr_h |= UART01x_LCRH_FEN;

	spin_lock_irqsave(&port->lock, flags);

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

	port->read_status_mask = UART01x_RSR_OE;
	if (termios->c_iflag & INPCK)
		port->read_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
	if (termios->c_iflag & (BRKINT | PARMRK))
		port->read_status_mask |= UART01x_RSR_BE;

	/*
	 * Characters to ignore
	 */
	port->ignore_status_mask = 0;
	if (termios->c_iflag & IGNPAR)
		port->ignore_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
	if (termios->c_iflag & IGNBRK) {
		port->ignore_status_mask |= UART01x_RSR_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 |= UART01x_RSR_OE;
	}

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

	/* first, disable everything */
	old_cr = UART_GET_CR(port) & ~UART010_CR_MSIE;

	if (UART_ENABLE_MS(port, termios->c_cflag))
		old_cr |= UART010_CR_MSIE;

	UART_PUT_CR(port, 0);

	/* Set baud rate */
	quot -= 1;
	UART_PUT_LCRM(port, ((quot & 0xf00) >> 8));
	UART_PUT_LCRL(port, (quot & 0xff));

	/*
	 * ----------v----------v----------v----------v-----
	 * NOTE: MUST BE WRITTEN AFTER UARTLCR_M & UARTLCR_L
	 * ----------^----------^----------^----------^-----
	 */
	UART_PUT_LCRH(port, lcr_h);
	UART_PUT_CR(port, old_cr);

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

static const char *pl010_type(struct uart_port *port)
{
	return port->type == PORT_AMBA ? "AMBA" : NULL;
}

/*
 * Release the memory region(s) being used by 'port'
 */
static void pl010_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 pl010_request_port(struct uart_port *port)
{
	return request_mem_region(port->mapbase, UART_PORT_SIZE, "uart-pl010")
			!= NULL ? 0 : -EBUSY;
}

/*
 * Configure/autoconfigure the port.
 */
static void pl010_config_port(struct uart_port *port, int flags)
{
	if (flags & UART_CONFIG_TYPE) {
		port->type = PORT_AMBA;
		pl010_request_port(port);
	}
}

/*
 * verify the new serial_struct (for TIOCSSERIAL).
 */
static int pl010_verify_port(struct uart_port *port, struct serial_struct *ser)
{
	int ret = 0;
	if (ser->type != PORT_UNKNOWN && ser->type != PORT_AMBA)
		ret = -EINVAL;
	if (ser->irq < 0 || ser->irq >= NR_IRQS)
		ret = -EINVAL;
	if (ser->baud_base < 9600)
		ret = -EINVAL;
	return ret;
}

static struct uart_ops amba_pl010_pops = {
	.tx_empty	= pl010_tx_empty,
	.set_mctrl	= pl010_set_mctrl,
	.get_mctrl	= pl010_get_mctrl,
	.stop_tx	= pl010_stop_tx,
	.start_tx	= pl010_start_tx,
	.stop_rx	= pl010_stop_rx,
	.enable_ms	= pl010_enable_ms,
	.break_ctl	= pl010_break_ctl,
	.startup	= pl010_startup,
	.shutdown	= pl010_shutdown,
	.set_termios	= pl010_set_termios,
	.type		= pl010_type,
	.release_port	= pl010_release_port,
	.request_port	= pl010_request_port,
	.config_port	= pl010_config_port,
	.verify_port	= pl010_verify_port,
};

static struct uart_amba_port amba_ports[UART_NR] = {
	{
		.port	= {
			.membase	= (void *)IO_ADDRESS(INTEGRATOR_UART0_BASE),
			.mapbase	= INTEGRATOR_UART0_BASE,
			.iotype		= SERIAL_IO_MEM,
			.irq		= IRQ_UARTINT0,
			.uartclk	= 14745600,
			.fifosize	= 16,
			.ops		= &amba_pl010_pops,
			.flags		= ASYNC_BOOT_AUTOCONF,
			.line		= 0,
		},
		.dtr_mask	= 1 << 5,
		.rts_mask	= 1 << 4,
	},
	{
		.port	= {
			.membase	= (void *)IO_ADDRESS(INTEGRATOR_UART1_BASE),
			.mapbase	= INTEGRATOR_UART1_BASE,
			.iotype		= SERIAL_IO_MEM,
			.irq		= IRQ_UARTINT1,
			.uartclk	= 14745600,
			.fifosize	= 16,
			.ops		= &amba_pl010_pops,
			.flags		= ASYNC_BOOT_AUTOCONF,
			.line		= 1,
		},
		.dtr_mask	= 1 << 7,
		.rts_mask	= 1 << 6,
	}
};

#ifdef CONFIG_SERIAL_AMBA_PL010_CONSOLE

static void
pl010_console_write(struct console *co, const char *s, unsigned int count)
{
	struct uart_port *port = &amba_ports[co->index].port;
	unsigned int status, old_cr;
	int i;

	/*
	 *	First save the CR then disable the interrupts
	 */
	old_cr = UART_GET_CR(port);
	UART_PUT_CR(port, UART01x_CR_UARTEN);

	/*
	 *	Now, do each character
	 */
	for (i = 0; i < count; i++) {
		do {
			status = UART_GET_FR(port);
		} while (!UART_TX_READY(status));
		UART_PUT_CHAR(port, s[i]);
		if (s[i] == '\n') {
			do {
				status = UART_GET_FR(port);
			} while (!UART_TX_READY(status));
			UART_PUT_CHAR(port, '\r');
		}
	}

	/*
	 *	Finally, wait for transmitter to become empty
	 *	and restore the TCR
	 */
	do {
		status = UART_GET_FR(port);
	} while (status & UART01x_FR_BUSY);
	UART_PUT_CR(port, old_cr);
}

static void __init
pl010_console_get_options(struct uart_port *port, int *baud,
			     int *parity, int *bits)
{
	if (UART_GET_CR(port) & UART01x_CR_UARTEN) {
		unsigned int lcr_h, quot;
		lcr_h = UART_GET_LCRH(port);

		*parity = 'n';
		if (lcr_h & UART01x_LCRH_PEN) {
			if (lcr_h & UART01x_LCRH_EPS)
				*parity = 'e';
			else
				*parity = 'o';
		}

		if ((lcr_h & 0x60) == UART01x_LCRH_WLEN_7)
			*bits = 7;
		else
			*bits = 8;

		quot = UART_GET_LCRL(port) | UART_GET_LCRM(port) << 8;
		*baud = port->uartclk / (16 * (quot + 1));
	}
}

static int __init pl010_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.
	 */
	if (co->index >= UART_NR)
		co->index = 0;
	port = &amba_ports[co->index].port;

	if (options)
		uart_parse_options(options, &baud, &parity, &bits, &flow);
	else
		pl010_console_get_options(port, &baud, &parity, &bits);

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

extern struct uart_driver amba_reg;
static struct console amba_console = {
	.name		= "ttyAM",
	.write		= pl010_console_write,
	.device		= uart_console_device,
	.setup		= pl010_console_setup,
	.flags		= CON_PRINTBUFFER,
	.index		= -1,
	.data		= &amba_reg,
};

#define AMBA_CONSOLE	&amba_console
#else
#define AMBA_CONSOLE	NULL
#endif

static struct uart_driver amba_reg = {
	.owner			= THIS_MODULE,
	.driver_name		= "ttyAM",
	.dev_name		= "ttyAM",
	.major			= SERIAL_AMBA_MAJOR,
	.minor			= SERIAL_AMBA_MINOR,
	.nr			= UART_NR,
	.cons			= AMBA_CONSOLE,
};

static int pl010_probe(struct amba_device *dev, void *id)
{
	int i;

	for (i = 0; i < UART_NR; i++) {
		if (amba_ports[i].port.mapbase != dev->res.start)
			continue;

		amba_ports[i].port.dev = &dev->dev;
		uart_add_one_port(&amba_reg, &amba_ports[i].port);
		amba_set_drvdata(dev, &amba_ports[i]);
		break;
	}

	return 0;
}

static int pl010_remove(struct amba_device *dev)
{
	struct uart_amba_port *uap = amba_get_drvdata(dev);

	if (uap)
		uart_remove_one_port(&amba_reg, &uap->port);

	amba_set_drvdata(dev, NULL);

	return 0;
}

static int pl010_suspend(struct amba_device *dev, u32 state)
{
	struct uart_amba_port *uap = amba_get_drvdata(dev);

	if (uap)
		uart_suspend_port(&amba_reg, &uap->port);

	return 0;
}

static int pl010_resume(struct amba_device *dev)
{
	struct uart_amba_port *uap = amba_get_drvdata(dev);

	if (uap)
		uart_resume_port(&amba_reg, &uap->port);

	return 0;
}

static struct amba_id pl010_ids[] __initdata = {
	{
		.id	= 0x00041010,
		.mask	= 0x000fffff,
	},
	{ 0, 0 },
};

static struct amba_driver pl010_driver = {
	.drv = {
		.name	= "uart-pl010",
	},
	.id_table	= pl010_ids,
	.probe		= pl010_probe,
	.remove		= pl010_remove,
	.suspend	= pl010_suspend,
	.resume		= pl010_resume,
};

static int __init pl010_init(void)
{
	int ret;

	printk(KERN_INFO "Serial: AMBA driver $Revision: 1.41 $\n");

	ret = uart_register_driver(&amba_reg);
	if (ret == 0) {
		ret = amba_driver_register(&pl010_driver);
		if (ret)
			uart_unregister_driver(&amba_reg);
	}
	return ret;
}

static void __exit pl010_exit(void)
{
	amba_driver_unregister(&pl010_driver);
	uart_unregister_driver(&amba_reg);
}

module_init(pl010_init);
module_exit(pl010_exit);

MODULE_AUTHOR("ARM Ltd/Deep Blue Solutions Ltd");
MODULE_DESCRIPTION("ARM AMBA serial port driver $Revision: 1.41 $");
MODULE_LICENSE("GPL");