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

Directory: drivers/tty/serial
/*
* ***************************************************************************
* Marvell Armada-3700 Serial Driver
* Author: Wilson Ding <dingwei@marvell.com>
* Copyright (C) 2015 Marvell International 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 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, see <http://www.gnu.org/licenses/>.
* ***************************************************************************
*/

#include <linux/clk.h>
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>

/* Register Map */

#define UART_RBR		0x00

#define  RBR_BRK_DET		BIT(15)

#define  RBR_FRM_ERR_DET	BIT(14)

#define  RBR_PAR_ERR_DET	BIT(13)

#define  RBR_OVR_ERR_DET	BIT(12)


#define UART_TSH		0x04


#define UART_CTRL		0x08

#define  CTRL_SOFT_RST		BIT(31)

#define  CTRL_TXFIFO_RST	BIT(15)

#define  CTRL_RXFIFO_RST	BIT(14)

#define  CTRL_ST_MIRR_EN	BIT(13)

#define  CTRL_LPBK_EN		BIT(12)

#define  CTRL_SND_BRK_SEQ	BIT(11)

#define  CTRL_PAR_EN		BIT(10)

#define  CTRL_TWO_STOP		BIT(9)

#define  CTRL_TX_HFL_INT	BIT(8)

#define  CTRL_RX_HFL_INT	BIT(7)

#define  CTRL_TX_EMP_INT	BIT(6)

#define  CTRL_TX_RDY_INT	BIT(5)

#define  CTRL_RX_RDY_INT	BIT(4)

#define  CTRL_BRK_DET_INT	BIT(3)

#define  CTRL_FRM_ERR_INT	BIT(2)

#define  CTRL_PAR_ERR_INT	BIT(1)

#define  CTRL_OVR_ERR_INT	BIT(0)

#define  CTRL_RX_INT			(CTRL_RX_RDY_INT | CTRL_BRK_DET_INT |\
        CTRL_FRM_ERR_INT | CTRL_PAR_ERR_INT | CTRL_OVR_ERR_INT)


#define UART_STAT		0x0c

#define  STAT_TX_FIFO_EMP	BIT(13)

#define  STAT_RX_FIFO_EMP	BIT(12)

#define  STAT_TX_FIFO_FUL	BIT(11)

#define  STAT_TX_FIFO_HFL	BIT(10)

#define  STAT_RX_TOGL		BIT(9)

#define  STAT_RX_FIFO_FUL	BIT(8)

#define  STAT_RX_FIFO_HFL	BIT(7)

#define  STAT_TX_EMP		BIT(6)

#define  STAT_TX_RDY		BIT(5)

#define  STAT_RX_RDY		BIT(4)

#define  STAT_BRK_DET		BIT(3)

#define  STAT_FRM_ERR		BIT(2)

#define  STAT_PAR_ERR		BIT(1)

#define  STAT_OVR_ERR		BIT(0)

#define  STAT_BRK_ERR		(STAT_BRK_DET | STAT_FRM_ERR | STAT_FRM_ERR\
                                 | STAT_PAR_ERR | STAT_OVR_ERR)


#define UART_BRDV		0x10


#define MVEBU_NR_UARTS		1


#define MVEBU_UART_TYPE		"mvebu-uart"


static struct uart_port mvebu_uart_ports[MVEBU_NR_UARTS];


struct mvebu_uart_data {
	
struct uart_port *port;
	
struct clk       *clk;
};

/* Core UART Driver Operations */


static unsigned int mvebu_uart_tx_empty(struct uart_port *port)
{
	unsigned long flags;
	unsigned int st;

	spin_lock_irqsave(&port->lock, flags);
	st = readl(port->membase + UART_STAT);
	spin_unlock_irqrestore(&port->lock, flags);

	return (st & STAT_TX_FIFO_EMP) ? TIOCSER_TEMT : 0;
}

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

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static void mvebu_uart_set_mctrl(struct uart_port *port,
				 unsigned int mctrl)
{
/*
 * Even if we do not support configuring the modem control lines, this
 * function must be proided to the serial core
 */
}

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static void mvebu_uart_stop_tx(struct uart_port *port)
{
	unsigned int ctl = readl(port->membase + UART_CTRL);

	ctl &= ~CTRL_TX_RDY_INT;
	writel(ctl, port->membase + UART_CTRL);
}

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static void mvebu_uart_start_tx(struct uart_port *port)
{
	unsigned int ctl = readl(port->membase + UART_CTRL);

	ctl |= CTRL_TX_RDY_INT;
	writel(ctl, port->membase + UART_CTRL);
}

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static void mvebu_uart_stop_rx(struct uart_port *port)
{
	unsigned int ctl = readl(port->membase + UART_CTRL);

	ctl &= ~CTRL_RX_INT;
	writel(ctl, port->membase + UART_CTRL);
}

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static void mvebu_uart_break_ctl(struct uart_port *port, int brk)
{
	unsigned int ctl;
	unsigned long flags;

	spin_lock_irqsave(&port->lock, flags);
	ctl = readl(port->membase + UART_CTRL);
	if (brk == -1)
		ctl |= CTRL_SND_BRK_SEQ;
	else
		ctl &= ~CTRL_SND_BRK_SEQ;
	writel(ctl, port->membase + UART_CTRL);
	spin_unlock_irqrestore(&port->lock, flags);
}

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static void mvebu_uart_rx_chars(struct uart_port *port, unsigned int status)
{
	struct tty_port *tport = &port->state->port;
	unsigned char ch = 0;
	char flag = 0;

	do {
		if (status & STAT_RX_RDY) {
			ch = readl(port->membase + UART_RBR);
			ch &= 0xff;
			flag = TTY_NORMAL;
			port->icount.rx++;

			if (status & STAT_PAR_ERR)
				port->icount.parity++;
		}

		if (status & STAT_BRK_DET) {
			port->icount.brk++;
			status &= ~(STAT_FRM_ERR | STAT_PAR_ERR);
			if (uart_handle_break(port))
				goto ignore_char;
		}

		if (status & STAT_OVR_ERR)
			port->icount.overrun++;

		if (status & STAT_FRM_ERR)
			port->icount.frame++;

		if (uart_handle_sysrq_char(port, ch))
			goto ignore_char;

		if (status & port->ignore_status_mask & STAT_PAR_ERR)
			status &= ~STAT_RX_RDY;

		status &= port->read_status_mask;

		if (status & STAT_PAR_ERR)
			flag = TTY_PARITY;

		status &= ~port->ignore_status_mask;

		if (status & STAT_RX_RDY)
			tty_insert_flip_char(tport, ch, flag);

		if (status & STAT_BRK_DET)
			tty_insert_flip_char(tport, 0, TTY_BREAK);

		if (status & STAT_FRM_ERR)
			tty_insert_flip_char(tport, 0, TTY_FRAME);

		if (status & STAT_OVR_ERR)
			tty_insert_flip_char(tport, 0, TTY_OVERRUN);

ignore_char:
		status = readl(port->membase + UART_STAT);
	} while (status & (STAT_RX_RDY | STAT_BRK_DET));

	tty_flip_buffer_push(tport);
}

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static void mvebu_uart_tx_chars(struct uart_port *port, unsigned int status)
{
	struct circ_buf *xmit = &port->state->xmit;
	unsigned int count;
	unsigned int st;

	if (port->x_char) {
		writel(port->x_char, port->membase + UART_TSH);
		port->icount.tx++;
		port->x_char = 0;
		return;
	}

	if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
		mvebu_uart_stop_tx(port);
		return;
	}

	for (count = 0; count < port->fifosize; count++) {
		writel(xmit->buf[xmit->tail], port->membase + UART_TSH);
		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
		port->icount.tx++;

		if (uart_circ_empty(xmit))
			break;

		st = readl(port->membase + UART_STAT);
		if (st & STAT_TX_FIFO_FUL)
			break;
	}

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

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

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static irqreturn_t mvebu_uart_isr(int irq, void *dev_id)
{
	struct uart_port *port = (struct uart_port *)dev_id;
	unsigned int st = readl(port->membase + UART_STAT);

	if (st & (STAT_RX_RDY | STAT_OVR_ERR | STAT_FRM_ERR | STAT_BRK_DET))
		mvebu_uart_rx_chars(port, st);

	if (st & STAT_TX_RDY)
		mvebu_uart_tx_chars(port, st);

	return IRQ_HANDLED;
}

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static int mvebu_uart_startup(struct uart_port *port)
{
	int ret;

	writel(CTRL_TXFIFO_RST | CTRL_RXFIFO_RST,
	       port->membase + UART_CTRL);
	udelay(1);
	writel(CTRL_RX_INT, port->membase + UART_CTRL);

	ret = request_irq(port->irq, mvebu_uart_isr, port->irqflags, "serial",
			  port);
	if (ret) {
		dev_err(port->dev, "failed to request irq\n");
		return ret;
	}

	return 0;
}

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static void mvebu_uart_shutdown(struct uart_port *port)
{
	writel(0, port->membase + UART_CTRL);
}

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static void mvebu_uart_set_termios(struct uart_port *port,
				   struct ktermios *termios,
				   struct ktermios *old)
{
	unsigned long flags;
	unsigned int baud;

	spin_lock_irqsave(&port->lock, flags);

	port->read_status_mask = STAT_RX_RDY | STAT_OVR_ERR |
		STAT_TX_RDY | STAT_TX_FIFO_FUL;

	if (termios->c_iflag & INPCK)
		port->read_status_mask |= STAT_FRM_ERR | STAT_PAR_ERR;

	port->ignore_status_mask = 0;
	if (termios->c_iflag & IGNPAR)
		port->ignore_status_mask |=
			STAT_FRM_ERR | STAT_PAR_ERR | STAT_OVR_ERR;

	if ((termios->c_cflag & CREAD) == 0)
		port->ignore_status_mask |= STAT_RX_RDY | STAT_BRK_ERR;

	if (old)
		tty_termios_copy_hw(termios, old);

	baud = uart_get_baud_rate(port, termios, old, 0, 460800);
	uart_update_timeout(port, termios->c_cflag, baud);

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

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static const char *mvebu_uart_type(struct uart_port *port)
{
	return MVEBU_UART_TYPE;
}

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static void mvebu_uart_release_port(struct uart_port *port)
{
	/* Nothing to do here */
}

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

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#ifdef CONFIG_CONSOLE_POLL


static int mvebu_uart_get_poll_char(struct uart_port *port)
{
	unsigned int st = readl(port->membase + UART_STAT);

	if (!(st & STAT_RX_RDY))
		return NO_POLL_CHAR;

	return readl(port->membase + UART_RBR);
}

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static void mvebu_uart_put_poll_char(struct uart_port *port, unsigned char c)
{
	unsigned int st;

	for (;;) {
		st = readl(port->membase + UART_STAT);

		if (!(st & STAT_TX_FIFO_FUL))
			break;

		udelay(1);
	}

	writel(c, port->membase + UART_TSH);
}
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#endif


static const struct uart_ops mvebu_uart_ops = {
	.tx_empty	= mvebu_uart_tx_empty,
	.set_mctrl	= mvebu_uart_set_mctrl,
	.get_mctrl	= mvebu_uart_get_mctrl,
	.stop_tx	= mvebu_uart_stop_tx,
	.start_tx	= mvebu_uart_start_tx,
	.stop_rx	= mvebu_uart_stop_rx,
	.break_ctl	= mvebu_uart_break_ctl,
	.startup	= mvebu_uart_startup,
	.shutdown	= mvebu_uart_shutdown,
	.set_termios	= mvebu_uart_set_termios,
	.type		= mvebu_uart_type,
	.release_port	= mvebu_uart_release_port,
	.request_port	= mvebu_uart_request_port,
#ifdef CONFIG_CONSOLE_POLL
	.poll_get_char	= mvebu_uart_get_poll_char,
	.poll_put_char	= mvebu_uart_put_poll_char,
#endif
};

/* Console Driver Operations  */

#ifdef CONFIG_SERIAL_MVEBU_CONSOLE
/* Early Console */


static void mvebu_uart_putc(struct uart_port *port, int c)
{
	unsigned int st;

	for (;;) {
		st = readl(port->membase + UART_STAT);
		if (!(st & STAT_TX_FIFO_FUL))
			break;
	}

	writel(c, port->membase + UART_TSH);

	for (;;) {
		st = readl(port->membase + UART_STAT);
		if (st & STAT_TX_FIFO_EMP)
			break;
	}
}

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

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

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static int __init

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

	device->con->write = mvebu_uart_putc_early_write;

	return 0;
}

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EARLYCON_DECLARE(ar3700_uart, mvebu_uart_early_console_setup);
OF_EARLYCON_DECLARE(ar3700_uart, "marvell,armada-3700-uart",
		    mvebu_uart_early_console_setup);



static void wait_for_xmitr(struct uart_port *port)
{
	u32 val;

	readl_poll_timeout_atomic(port->membase + UART_STAT, val,
				  (val & STAT_TX_EMP), 1, 10000);
}

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static void mvebu_uart_console_putchar(struct uart_port *port, int ch)
{
	wait_for_xmitr(port);
	writel(ch, port->membase + UART_TSH);
}

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static void mvebu_uart_console_write(struct console *co, const char *s,
				     unsigned int count)
{
	struct uart_port *port = &mvebu_uart_ports[co->index];
	unsigned long flags;
	unsigned int ier;
	int locked = 1;

	if (oops_in_progress)
		locked = spin_trylock_irqsave(&port->lock, flags);
	else
		spin_lock_irqsave(&port->lock, flags);

	ier = readl(port->membase + UART_CTRL) &
		(CTRL_RX_INT | CTRL_TX_RDY_INT);
	writel(0, port->membase + UART_CTRL);

	uart_console_write(port, s, count, mvebu_uart_console_putchar);

	wait_for_xmitr(port);

	if (ier)
		writel(ier, port->membase + UART_CTRL);

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

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static int mvebu_uart_console_setup(struct console *co, char *options)
{
	struct uart_port *port;
	int baud = 9600;
	int bits = 8;
	int parity = 'n';
	int flow = 'n';

	if (co->index < 0 || co->index >= MVEBU_NR_UARTS)
		return -EINVAL;

	port = &mvebu_uart_ports[co->index];

	if (!port->mapbase || !port->membase) {
		pr_debug("console on ttyMV%i not present\n", co->index);
		return -ENODEV;
	}

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

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

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static struct uart_driver mvebu_uart_driver;


static struct console mvebu_uart_console = {
	.name	= "ttyMV",
	.write	= mvebu_uart_console_write,
	.device	= uart_console_device,
	.setup	= mvebu_uart_console_setup,
	.flags	= CON_PRINTBUFFER,
	.index	= -1,
	.data	= &mvebu_uart_driver,
};



static int __init mvebu_uart_console_init(void)
{
	register_console(&mvebu_uart_console);
	return 0;
}

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console_initcall(mvebu_uart_console_init);


#endif /* CONFIG_SERIAL_MVEBU_CONSOLE */


static struct uart_driver mvebu_uart_driver = {
	.owner			= THIS_MODULE,
	.driver_name		= "mvebu_serial",
	.dev_name		= "ttyMV",
	.nr			= MVEBU_NR_UARTS,
#ifdef CONFIG_SERIAL_MVEBU_CONSOLE
	.cons			= &mvebu_uart_console,
#endif
};



static int mvebu_uart_probe(struct platform_device *pdev)
{
	struct resource *reg = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	struct resource *irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	struct uart_port *port;
	struct mvebu_uart_data *data;
	int ret;

	if (!reg || !irq) {
		dev_err(&pdev->dev, "no registers/irq defined\n");
		return -EINVAL;
	}

	port = &mvebu_uart_ports[0];

	spin_lock_init(&port->lock);

	port->dev        = &pdev->dev;
	port->type       = PORT_MVEBU;
	port->ops        = &mvebu_uart_ops;
	port->regshift   = 0;

	port->fifosize   = 32;
	port->iotype     = UPIO_MEM32;
	port->flags      = UPF_FIXED_PORT;
	port->line       = 0; /* single port: force line number to  0 */

	port->irq        = irq->start;
	port->irqflags   = 0;
	port->mapbase    = reg->start;

	port->membase = devm_ioremap_resource(&pdev->dev, reg);
	if (IS_ERR(port->membase))
		return -PTR_ERR(port->membase);

	data = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_uart_data),
			    GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->port = port;

	port->private_data = data;
	platform_set_drvdata(pdev, data);

	ret = uart_add_one_port(&mvebu_uart_driver, port);
	if (ret)
		return ret;
	return 0;
}

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/* Match table for of_platform binding */

static const struct of_device_id mvebu_uart_of_match[] = {
	{ .compatible = "marvell,armada-3700-uart", },
	{}
};


static struct platform_driver mvebu_uart_platform_driver = {
	.probe	= mvebu_uart_probe,
	.driver	= {
		.name  = "mvebu-uart",
		.of_match_table = of_match_ptr(mvebu_uart_of_match),
		.suppress_bind_attrs = true,
        },
};



static int __init mvebu_uart_init(void)
{
	int ret;

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

	ret = platform_driver_register(&mvebu_uart_platform_driver);
	if (ret)
		uart_unregister_driver(&mvebu_uart_driver);

	return ret;
}
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arch_initcall(mvebu_uart_init);
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  Directory: drivers/tty/serial

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wilson ding	wilson ding	62	100.00%	1	100.00%
	Total	62	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

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

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