path: root/drivers/tty/serial/mxs-auart.c

/*
 * Freescale STMP37XX/STMP378X Application UART driver
 *
 * Author: dmitry pervushin <dimka@embeddedalley.com>
 *
 * Copyright 2008-2010 Freescale Semiconductor, Inc.
 * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
 *
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/wait.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/platform_device.h>
#include <linux/device.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/pinctrl/consumer.h>
#include <linux/of_device.h>
#include <linux/dma-mapping.h>
#include <linux/fsl/mxs-dma.h>

#include <asm/cacheflush.h>

#define MXS_AUART_PORTS 5

#define AUART_CTRL0			0x00000000
#define AUART_CTRL0_SET			0x00000004
#define AUART_CTRL0_CLR			0x00000008
#define AUART_CTRL0_TOG			0x0000000c
#define AUART_CTRL1			0x00000010
#define AUART_CTRL1_SET			0x00000014
#define AUART_CTRL1_CLR			0x00000018
#define AUART_CTRL1_TOG			0x0000001c
#define AUART_CTRL2			0x00000020
#define AUART_CTRL2_SET			0x00000024
#define AUART_CTRL2_CLR			0x00000028
#define AUART_CTRL2_TOG			0x0000002c
#define AUART_LINECTRL			0x00000030
#define AUART_LINECTRL_SET		0x00000034
#define AUART_LINECTRL_CLR		0x00000038
#define AUART_LINECTRL_TOG		0x0000003c
#define AUART_LINECTRL2			0x00000040
#define AUART_LINECTRL2_SET		0x00000044
#define AUART_LINECTRL2_CLR		0x00000048
#define AUART_LINECTRL2_TOG		0x0000004c
#define AUART_INTR			0x00000050
#define AUART_INTR_SET			0x00000054
#define AUART_INTR_CLR			0x00000058
#define AUART_INTR_TOG			0x0000005c
#define AUART_DATA			0x00000060
#define AUART_STAT			0x00000070
#define AUART_DEBUG			0x00000080
#define AUART_VERSION			0x00000090
#define AUART_AUTOBAUD			0x000000a0

#define AUART_CTRL0_SFTRST			(1 << 31)
#define AUART_CTRL0_CLKGATE			(1 << 30)
#define AUART_CTRL0_RXTO_ENABLE			(1 << 27)
#define AUART_CTRL0_RXTIMEOUT(v)		(((v) & 0x7ff) << 16)
#define AUART_CTRL0_XFER_COUNT(v)		((v) & 0xffff)

#define AUART_CTRL1_XFER_COUNT(v)		((v) & 0xffff)

#define AUART_CTRL2_DMAONERR			(1 << 26)
#define AUART_CTRL2_TXDMAE			(1 << 25)
#define AUART_CTRL2_RXDMAE			(1 << 24)

#define AUART_CTRL2_CTSEN			(1 << 15)
#define AUART_CTRL2_RTSEN			(1 << 14)
#define AUART_CTRL2_RTS				(1 << 11)
#define AUART_CTRL2_RXE				(1 << 9)
#define AUART_CTRL2_TXE				(1 << 8)
#define AUART_CTRL2_UARTEN			(1 << 0)

#define AUART_LINECTRL_BAUD_DIVINT_SHIFT	16
#define AUART_LINECTRL_BAUD_DIVINT_MASK		0xffff0000
#define AUART_LINECTRL_BAUD_DIVINT(v)		(((v) & 0xffff) << 16)
#define AUART_LINECTRL_BAUD_DIVFRAC_SHIFT	8
#define AUART_LINECTRL_BAUD_DIVFRAC_MASK	0x00003f00
#define AUART_LINECTRL_BAUD_DIVFRAC(v)		(((v) & 0x3f) << 8)
#define AUART_LINECTRL_WLEN_MASK		0x00000060
#define AUART_LINECTRL_WLEN(v)			(((v) & 0x3) << 5)
#define AUART_LINECTRL_FEN			(1 << 4)
#define AUART_LINECTRL_STP2			(1 << 3)
#define AUART_LINECTRL_EPS			(1 << 2)
#define AUART_LINECTRL_PEN			(1 << 1)
#define AUART_LINECTRL_BRK			(1 << 0)

#define AUART_INTR_RTIEN			(1 << 22)
#define AUART_INTR_TXIEN			(1 << 21)
#define AUART_INTR_RXIEN			(1 << 20)
#define AUART_INTR_CTSMIEN			(1 << 17)
#define AUART_INTR_RTIS				(1 << 6)
#define AUART_INTR_TXIS				(1 << 5)
#define AUART_INTR_RXIS				(1 << 4)
#define AUART_INTR_CTSMIS			(1 << 1)

#define AUART_STAT_BUSY				(1 << 29)
#define AUART_STAT_CTS				(1 << 28)
#define AUART_STAT_TXFE				(1 << 27)
#define AUART_STAT_TXFF				(1 << 25)
#define AUART_STAT_RXFE				(1 << 24)
#define AUART_STAT_OERR				(1 << 19)
#define AUART_STAT_BERR				(1 << 18)
#define AUART_STAT_PERR				(1 << 17)
#define AUART_STAT_FERR				(1 << 16)
#define AUART_STAT_RXCOUNT_MASK			0xffff

static struct uart_driver auart_driver;

enum mxs_auart_type {
	IMX23_AUART,
	IMX28_AUART,
};

struct mxs_auart_port {
	struct uart_port port;

#define MXS_AUART_DMA_CONFIG	0x1
#define MXS_AUART_DMA_ENABLED	0x2
#define MXS_AUART_DMA_TX_SYNC	2  /* bit 2 */
#define MXS_AUART_DMA_RX_READY	3  /* bit 3 */
	unsigned long flags;
	unsigned int ctrl;
	enum mxs_auart_type devtype;

	unsigned int irq;

	struct clk *clk;
	struct device *dev;

	/* for DMA */
	struct mxs_dma_data dma_data;
	int dma_channel_rx, dma_channel_tx;
	int dma_irq_rx, dma_irq_tx;
	int dma_channel;

	struct scatterlist tx_sgl;
	struct dma_chan	*tx_dma_chan;
	void *tx_dma_buf;

	struct scatterlist rx_sgl;
	struct dma_chan	*rx_dma_chan;
	void *rx_dma_buf;
};

static struct platform_device_id mxs_auart_devtype[] = {
	{ .name = "mxs-auart-imx23", .driver_data = IMX23_AUART },
	{ .name = "mxs-auart-imx28", .driver_data = IMX28_AUART },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, mxs_auart_devtype);

static struct of_device_id mxs_auart_dt_ids[] = {
	{
		.compatible = "fsl,imx28-auart",
		.data = &mxs_auart_devtype[IMX28_AUART]
	}, {
		.compatible = "fsl,imx23-auart",
		.data = &