Release 4.7 drivers/tty/serial/mps2-uart.c

Directory: drivers/tty/serial
/*
 * Copyright (C) 2015 ARM Limited
 *
 * Author: Vladimir Murzin <vladimir.murzin@arm.com>
 *
 * 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.
 *
 * TODO: support for SysRq
 */


#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt

#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/console.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/serial_core.h>
#include <linux/tty_flip.h>
#include <linux/types.h>


#define SERIAL_NAME	"ttyMPS"

#define DRIVER_NAME	"mps2-uart"

#define MAKE_NAME(x)	(DRIVER_NAME # x)


#define UARTn_DATA				0x00


#define UARTn_STATE				0x04

#define UARTn_STATE_TX_FULL			BIT(0)

#define UARTn_STATE_RX_FULL			BIT(1)

#define UARTn_STATE_TX_OVERRUN			BIT(2)

#define UARTn_STATE_RX_OVERRUN			BIT(3)


#define UARTn_CTRL				0x08

#define UARTn_CTRL_TX_ENABLE			BIT(0)

#define UARTn_CTRL_RX_ENABLE			BIT(1)

#define UARTn_CTRL_TX_INT_ENABLE		BIT(2)

#define UARTn_CTRL_RX_INT_ENABLE		BIT(3)

#define UARTn_CTRL_TX_OVERRUN_INT_ENABLE	BIT(4)

#define UARTn_CTRL_RX_OVERRUN_INT_ENABLE	BIT(5)


#define UARTn_INT				0x0c

#define UARTn_INT_TX				BIT(0)

#define UARTn_INT_RX				BIT(1)

#define UARTn_INT_TX_OVERRUN			BIT(2)

#define UARTn_INT_RX_OVERRUN			BIT(3)


#define UARTn_BAUDDIV				0x10

#define UARTn_BAUDDIV_MASK			GENMASK(20, 0)

/*
 * Helpers to make typical enable/disable operations more readable.
 */

#define UARTn_CTRL_TX_GRP	(UARTn_CTRL_TX_ENABLE            |\
                                 UARTn_CTRL_TX_INT_ENABLE        |\
                                 UARTn_CTRL_TX_OVERRUN_INT_ENABLE)


#define UARTn_CTRL_RX_GRP	(UARTn_CTRL_RX_ENABLE            |\
                                 UARTn_CTRL_RX_INT_ENABLE        |\
                                 UARTn_CTRL_RX_OVERRUN_INT_ENABLE)


#define MPS2_MAX_PORTS		3


struct mps2_uart_port {
	
struct uart_port port;
	
struct clk *clk;
	
unsigned int tx_irq;
	
unsigned int rx_irq;
};



static inline struct mps2_uart_port *to_mps2_port(struct uart_port *port)
{
	return container_of(port, struct mps2_uart_port, port);
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 25 100.00% 1 100.00%
Total 25 100.00% 1 100.00%



static void mps2_uart_write8(struct uart_port *port, u8 val, unsigned int off)
{
	struct mps2_uart_port *mps_port = to_mps2_port(port);

	writeb(val, mps_port->port.membase + off);
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 41 100.00% 1 100.00%
Total 41 100.00% 1 100.00%



static u8 mps2_uart_read8(struct uart_port *port, unsigned int off)
{
	struct mps2_uart_port *mps_port = to_mps2_port(port);

	return readb(mps_port->port.membase + off);
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 37 100.00% 1 100.00%
Total 37 100.00% 1 100.00%



static void mps2_uart_write32(struct uart_port *port, u32 val, unsigned int off)
{
	struct mps2_uart_port *mps_port = to_mps2_port(port);

	writel_relaxed(val, mps_port->port.membase + off);
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 41 100.00% 1 100.00%
Total 41 100.00% 1 100.00%



static unsigned int mps2_uart_tx_empty(struct uart_port *port)
{
	u8 status = mps2_uart_read8(port, UARTn_STATE);

	return (status & UARTn_STATE_TX_FULL) ? 0 : TIOCSER_TEMT;
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 33 100.00% 1 100.00%
Total 33 100.00% 1 100.00%



static void mps2_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 14 100.00% 1 100.00%
Total 14 100.00% 1 100.00%



static unsigned int mps2_uart_get_mctrl(struct uart_port *port)
{
	return TIOCM_CAR | TIOCM_CTS | TIOCM_DSR;
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 19 100.00% 1 100.00%
Total 19 100.00% 1 100.00%



static void mps2_uart_stop_tx(struct uart_port *port)
{
	u8 control = mps2_uart_read8(port, UARTn_CTRL);

	control &= ~UARTn_CTRL_TX_INT_ENABLE;

	mps2_uart_write8(port, control, UARTn_CTRL);
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 35 100.00% 1 100.00%
Total 35 100.00% 1 100.00%



static void mps2_uart_tx_chars(struct uart_port *port)
{
	struct circ_buf *xmit = &port->state->xmit;

	while (!(mps2_uart_read8(port, UARTn_STATE) & UARTn_STATE_TX_FULL)) {
		if (port->x_char) {
			mps2_uart_write8(port, port->x_char, UARTn_DATA);
			port->x_char = 0;
			port->icount.tx++;
			continue;
		}

		if (uart_circ_empty(xmit) || uart_tx_stopped(port))
			break;

		mps2_uart_write8(port, xmit->buf[xmit->tail], UARTn_DATA);
		xmit->tail = (xmit->tail + 1) % UART_XMIT_SIZE;
		port->icount.tx++;
	}

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

	if (uart_circ_empty(xmit))
		mps2_uart_stop_tx(port);
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 148 100.00% 1 100.00%
Total 148 100.00% 1 100.00%



static void mps2_uart_start_tx(struct uart_port *port)
{
	u8 control = mps2_uart_read8(port, UARTn_CTRL);

	control |= UARTn_CTRL_TX_INT_ENABLE;

	mps2_uart_write8(port, control, UARTn_CTRL);

	/*
         * We've just unmasked the TX IRQ and now slow-starting via
         * polling; if there is enough data to fill up the internal
         * write buffer in one go, the TX IRQ should assert, at which
         * point we switch to fully interrupt-driven TX.
         */

	mps2_uart_tx_chars(port);
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 40 100.00% 1 100.00%
Total 40 100.00% 1 100.00%



static void mps2_uart_stop_rx(struct uart_port *port)
{
	u8 control = mps2_uart_read8(port, UARTn_CTRL);

	control &= ~UARTn_CTRL_RX_GRP;

	mps2_uart_write8(port, control, UARTn_CTRL);
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 35 100.00% 1 100.00%
Total 35 100.00% 1 100.00%



static void mps2_uart_break_ctl(struct uart_port *port, int ctl)
{
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 13 100.00% 1 100.00%
Total 13 100.00% 1 100.00%



static void mps2_uart_rx_chars(struct uart_port *port)
{
	struct tty_port *tport = &port->state->port;

	while (mps2_uart_read8(port, UARTn_STATE) & UARTn_STATE_RX_FULL) {
		u8 rxdata = mps2_uart_read8(port, UARTn_DATA);

		port->icount.rx++;
		tty_insert_flip_char(&port->state->port, rxdata, TTY_NORMAL);
	}

	tty_flip_buffer_push(tport);
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 72 100.00% 1 100.00%
Total 72 100.00% 1 100.00%



static irqreturn_t mps2_uart_rxirq(int irq, void *data)
{
	struct uart_port *port = data;
	u8 irqflag = mps2_uart_read8(port, UARTn_INT);

	if (unlikely(!(irqflag & UARTn_INT_RX)))
		return IRQ_NONE;

	spin_lock(&port->lock);

	mps2_uart_write8(port, UARTn_INT_RX, UARTn_INT);
	mps2_uart_rx_chars(port);

	spin_unlock(&port->lock);

	return IRQ_HANDLED;
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 78 100.00% 1 100.00%
Total 78 100.00% 1 100.00%



static irqreturn_t mps2_uart_txirq(int irq, void *data)
{
	struct uart_port *port = data;
	u8 irqflag = mps2_uart_read8(port, UARTn_INT);

	if (unlikely(!(irqflag & UARTn_INT_TX)))
		return IRQ_NONE;

	spin_lock(&port->lock);

	mps2_uart_write8(port, UARTn_INT_TX, UARTn_INT);
	mps2_uart_tx_chars(port);

	spin_unlock(&port->lock);

	return IRQ_HANDLED;
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 78 100.00% 1 100.00%
Total 78 100.00% 1 100.00%



static irqreturn_t mps2_uart_oerrirq(int irq, void *data)
{
	irqreturn_t handled = IRQ_NONE;
	struct uart_port *port = data;
	u8 irqflag = mps2_uart_read8(port, UARTn_INT);

	spin_lock(&port->lock);

	if (irqflag & UARTn_INT_RX_OVERRUN) {
		struct tty_port *tport = &port->state->port;

		mps2_uart_write8(port, UARTn_INT_RX_OVERRUN, UARTn_INT);
		port->icount.overrun++;
		tty_insert_flip_char(tport, 0, TTY_OVERRUN);
		tty_flip_buffer_push(tport);
		handled = IRQ_HANDLED;
	}

	/*
         * It's never been seen in practice and it never *should* happen since
         * we check if there is enough room in TX buffer before sending data.
         * So we keep this check in case something suspicious has happened.
         */
	if (irqflag & UARTn_INT_TX_OVERRUN) {
		mps2_uart_write8(port, UARTn_INT_TX_OVERRUN, UARTn_INT);
		handled = IRQ_HANDLED;
	}

	spin_unlock(&port->lock);

	return handled;
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 130 100.00% 1 100.00%
Total 130 100.00% 1 100.00%



static int mps2_uart_startup(struct uart_port *port)
{
	struct mps2_uart_port *mps_port = to_mps2_port(port);
	u8 control = mps2_uart_read8(port, UARTn_CTRL);
	int ret;

	control &= ~(UARTn_CTRL_RX_GRP | UARTn_CTRL_TX_GRP);

	mps2_uart_write8(port, control, UARTn_CTRL);

	ret = request_irq(mps_port->rx_irq, mps2_uart_rxirq, 0,
			  MAKE_NAME(-rx), mps_port);
	if (ret) {
		dev_err(port->dev, "failed to register rxirq (%d)\n", ret);
		return ret;
	}

	ret = request_irq(mps_port->tx_irq, mps2_uart_txirq, 0,
			  MAKE_NAME(-tx), mps_port);
	if (ret) {
		dev_err(port->dev, "failed to register txirq (%d)\n", ret);
		goto err_free_rxirq;
	}

	ret = request_irq(port->irq, mps2_uart_oerrirq, IRQF_SHARED,
			  MAKE_NAME(-overrun), mps_port);

	if (ret) {
		dev_err(port->dev, "failed to register oerrirq (%d)\n", ret);
		goto err_free_txirq;
	}

	control |= UARTn_CTRL_RX_GRP | UARTn_CTRL_TX_GRP;

	mps2_uart_write8(port, control, UARTn_CTRL);

	return 0;

err_free_txirq:
	free_irq(mps_port->tx_irq, mps_port);
err_free_rxirq:
	free_irq(mps_port->rx_irq, mps_port);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 218 100.00% 1 100.00%
Total 218 100.00% 1 100.00%



static void mps2_uart_shutdown(struct uart_port *port)
{
	struct mps2_uart_port *mps_port = to_mps2_port(port);
	u8 control = mps2_uart_read8(port, UARTn_CTRL);

	control &= ~(UARTn_CTRL_RX_GRP | UARTn_CTRL_TX_GRP);

	mps2_uart_write8(port, control, UARTn_CTRL);

	free_irq(mps_port->rx_irq, mps_port);
	free_irq(mps_port->tx_irq, mps_port);
	free_irq(port->irq, mps_port);
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 76 100.00% 1 100.00%
Total 76 100.00% 1 100.00%


static void

mps2_uart_set_termios(struct uart_port *port, struct ktermios *termios,
		      struct ktermios *old)
{
	unsigned long flags;
	unsigned int baud, bauddiv;

	termios->c_cflag &= ~(CRTSCTS | CMSPAR);
	termios->c_cflag &= ~CSIZE;
	termios->c_cflag |= CS8;
	termios->c_cflag &= ~PARENB;
	termios->c_cflag &= ~CSTOPB;

	baud = uart_get_baud_rate(port, termios, old,
			DIV_ROUND_CLOSEST(port->uartclk, UARTn_BAUDDIV_MASK),
			DIV_ROUND_CLOSEST(port->uartclk, 16));

	bauddiv = DIV_ROUND_CLOSEST(port->uartclk, baud);

	spin_lock_irqsave(&port->lock, flags);

	uart_update_timeout(port, termios->c_cflag, baud);
	mps2_uart_write32(port, bauddiv, UARTn_BAUDDIV);

	spin_unlock_irqrestore(&port->lock, flags);

	if (tty_termios_baud_rate(termios))
		tty_termios_encode_baud_rate(termios, baud, baud);
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 165 100.00% 1 100.00%
Total 165 100.00% 1 100.00%



static const char *mps2_uart_type(struct uart_port *port)
{
	return (port->type == PORT_MPS2UART) ? DRIVER_NAME : NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 26 100.00% 1 100.00%
Total 26 100.00% 1 100.00%



static void mps2_uart_release_port(struct uart_port *port)
{
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 10 100.00% 1 100.00%
Total 10 100.00% 1 100.00%



static int mps2_uart_request_port(struct uart_port *port)
{
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 14 100.00% 1 100.00%
Total 14 100.00% 1 100.00%



static void mps2_uart_config_port(struct uart_port *port, int type)
{
	if (type & UART_CONFIG_TYPE && !mps2_uart_request_port(port))
		port->type = PORT_MPS2UART;
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 32 100.00% 1 100.00%
Total 32 100.00% 1 100.00%



static int mps2_uart_verify_port(struct uart_port *port, struct serial_struct *serinfo)
{
	return -EINVAL;
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 20 100.00% 1 100.00%
Total 20 100.00% 1 100.00%


static const struct uart_ops mps2_uart_pops = {
	.tx_empty = mps2_uart_tx_empty,
	.set_mctrl = mps2_uart_set_mctrl,
	.get_mctrl = mps2_uart_get_mctrl,
	.stop_tx = mps2_uart_stop_tx,
	.start_tx = mps2_uart_start_tx,
	.stop_rx = mps2_uart_stop_rx,
	.break_ctl = mps2_uart_break_ctl,
	.startup = mps2_uart_startup,
	.shutdown = mps2_uart_shutdown,
	.set_termios = mps2_uart_set_termios,
	.type = mps2_uart_type,
	.release_port = mps2_uart_release_port,
	.request_port = mps2_uart_request_port,
	.config_port = mps2_uart_config_port,
	.verify_port = mps2_uart_verify_port,
};


static struct mps2_uart_port mps2_uart_ports[MPS2_MAX_PORTS];

#ifdef CONFIG_SERIAL_MPS2_UART_CONSOLE


static void mps2_uart_console_putchar(struct uart_port *port, int ch)
{
	while (mps2_uart_read8(port, UARTn_STATE) & UARTn_STATE_TX_FULL)
		cpu_relax();

	mps2_uart_write8(port, ch, UARTn_DATA);
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 37 100.00% 1 100.00%
Total 37 100.00% 1 100.00%



static void mps2_uart_console_write(struct console *co, const char *s, unsigned int cnt)
{
	struct uart_port *port = &mps2_uart_ports[co->index].port;

	uart_console_write(port, s, cnt, mps2_uart_console_putchar);
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 46 100.00% 1 100.00%
Total 46 100.00% 1 100.00%



static int mps2_uart_console_setup(struct console *co, char *options)
{
	struct mps2_uart_port *mps_port;
	int baud = 9600;
	int bits = 8;
	int parity = 'n';
	int flow = 'n';

	if (co->index < 0 || co->index >= MPS2_MAX_PORTS)
		return -ENODEV;

	mps_port = &mps2_uart_ports[co->index];

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

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

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 108 100.00% 1 100.00%
Total 108 100.00% 1 100.00%


static struct uart_driver mps2_uart_driver;


static struct console mps2_uart_console = {
	.name = SERIAL_NAME,
	.device = uart_console_device,
	.write = mps2_uart_console_write,
	.setup = mps2_uart_console_setup,
	.flags = CON_PRINTBUFFER,
	.index = -1,
	.data = &mps2_uart_driver,
};


#define MPS2_SERIAL_CONSOLE (&mps2_uart_console)



static void mps2_early_putchar(struct uart_port *port, int ch)
{
	while (readb(port->membase + UARTn_STATE) & UARTn_STATE_TX_FULL)
		cpu_relax();

	writeb((unsigned char)ch, port->membase + UARTn_DATA);
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 45 100.00% 1 100.00%
Total 45 100.00% 1 100.00%



static void mps2_early_write(struct console *con, const char *s, unsigned int n)
{
	struct earlycon_device *dev = con->data;

	uart_console_write(&dev->port, s, n, mps2_early_putchar);
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 43 100.00% 1 100.00%
Total 43 100.00% 1 100.00%



static int __init mps2_early_console_setup(struct earlycon_device *device,
					   const char *opt)
{
	if (!device->port.membase)
		return -ENODEV;

	device->con->write = mps2_early_write;

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 41 100.00% 1 100.00%
Total 41 100.00% 1 100.00%

OF_EARLYCON_DECLARE(mps2, "arm,mps2-uart", mps2_early_console_setup);

#else

#define MPS2_SERIAL_CONSOLE NULL
#endif


static struct uart_driver mps2_uart_driver = {
	.driver_name = DRIVER_NAME,
	.dev_name = SERIAL_NAME,
	.nr = MPS2_MAX_PORTS,
	.cons = MPS2_SERIAL_CONSOLE,
};



static struct mps2_uart_port *mps2_of_get_port(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	int id;

	if (!np)
		return NULL;

	id = of_alias_get_id(np, "serial");
	if (id < 0)
		id = 0;

	if (WARN_ON(id >= MPS2_MAX_PORTS))
		return NULL;

	mps2_uart_ports[id].port.line = id;
	return &mps2_uart_ports[id];
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 84 100.00% 1 100.00%
Total 84 100.00% 1 100.00%



static int mps2_init_port(struct mps2_uart_port *mps_port,
			  struct platform_device *pdev)
{
	struct resource *res;
	int ret;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	mps_port->port.membase = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(mps_port->port.membase))
		return PTR_ERR(mps_port->port.membase);

	mps_port->port.mapbase = res->start;
	mps_port->port.mapsize = resource_size(res);

	mps_port->rx_irq = platform_get_irq(pdev, 0);
	mps_port->tx_irq = platform_get_irq(pdev, 1);
	mps_port->port.irq = platform_get_irq(pdev, 2);

	mps_port->port.iotype = UPIO_MEM;
	mps_port->port.flags = UPF_BOOT_AUTOCONF;
	mps_port->port.fifosize = 1;
	mps_port->port.ops = &mps2_uart_pops;
	mps_port->port.dev = &pdev->dev;

	mps_port->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(mps_port->clk))
		return PTR_ERR(mps_port->clk);

	ret = clk_prepare_enable(mps_port->clk);
	if (ret)
		return ret;

	mps_port->port.uartclk = clk_get_rate(mps_port->clk);

	clk_disable_unprepare(mps_port->clk);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 242 100.00% 1 100.00%
Total 242 100.00% 1 100.00%



static int mps2_serial_probe(struct platform_device *pdev)
{
	struct mps2_uart_port *mps_port;
	int ret;

	mps_port = mps2_of_get_port(pdev);
	if (!mps_port)
		return -ENODEV;

	ret = mps2_init_port(mps_port, pdev);
	if (ret)
		return ret;

	ret = uart_add_one_port(&mps2_uart_driver, &mps_port->port);
	if (ret)
		return ret;

	platform_set_drvdata(pdev, mps_port);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 81 100.00% 1 100.00%
Total 81 100.00% 1 100.00%



static int mps2_serial_remove(struct platform_device *pdev)
{
	struct mps2_uart_port *mps_port = platform_get_drvdata(pdev);

	uart_remove_one_port(&mps2_uart_driver, &mps_port->port);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 35 100.00% 1 100.00%
Total 35 100.00% 1 100.00%

#ifdef CONFIG_OF

static const struct of_device_id mps2_match[] = {
	{ .compatible = "arm,mps2-uart", },
	{},
};
MODULE_DEVICE_TABLE(of, mps2_match);
#endif


static struct platform_driver mps2_serial_driver = {
	.probe = mps2_serial_probe,
	.remove = mps2_serial_remove,

	.driver = {
		.name = DRIVER_NAME,
		.of_match_table = of_match_ptr(mps2_match),
        },
};



static int __init mps2_uart_init(void)
{
	int ret;

	ret = uart_register_driver(&mps2_uart_driver);
	if (ret)
		return ret;

	ret = platform_driver_register(&mps2_serial_driver);
	if (ret)
		uart_unregister_driver(&mps2_uart_driver);

	return ret;
}
Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 48 100.00% 1 100.00%
Total 48 100.00% 1 100.00%


module_init(mps2_uart_init);



static void __exit mps2_uart_exit(void)
{
	platform_driver_unregister(&mps2_serial_driver);
	uart_unregister_driver(&mps2_uart_driver);
}
Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 21 100.00% 1 100.00%
Total 21 100.00% 1 100.00%


module_exit(mps2_uart_exit);

MODULE_AUTHOR("Vladimir Murzin <vladimir.murzin@arm.com>");
MODULE_DESCRIPTION("MPS2 UART driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DRIVER_NAME);
Overall Contributors
Person Tokens Prop Commits CommitProp
vladimir murzin vladimir murzin 2692 100.00% 2 100.00%
Total 2692 100.00% 2 100.00%
  Directory: drivers/tty/serial

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
vladimir murzin	vladimir murzin	25	100.00%	1	100.00%
	Total	25	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.7 drivers/tty/serial/mps2-uart.c

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Overall Contributors
