path: root/drivers/tty/serial/pch_uart.c

/*
 *Copyright (C) 2010 OKI SEMICONDUCTOR CO., 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; version 2 of the License.
 *
 *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, write to the Free Software
 *Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
 */
#include <linux/serial_reg.h>
#include <linux/pci.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/serial_core.h>
#include <linux/interrupt.h>
#include <linux/io.h>

#include <linux/dmaengine.h>
#include <linux/pch_dma.h>

enum {
	PCH_UART_HANDLED_RX_INT_SHIFT,
	PCH_UART_HANDLED_TX_INT_SHIFT,
	PCH_UART_HANDLED_RX_ERR_INT_SHIFT,
	PCH_UART_HANDLED_RX_TRG_INT_SHIFT,
	PCH_UART_HANDLED_MS_INT_SHIFT,
};

enum {
	PCH_UART_8LINE,
	PCH_UART_2LINE,
};

#define PCH_UART_DRIVER_DEVICE "ttyPCH"

#define PCH_UART_NR_GE_256FIFO		1
#define PCH_UART_NR_GE_64FIFO		3
#define PCH_UART_NR_GE	(PCH_UART_NR_GE_256FIFO+PCH_UART_NR_GE_64FIFO)
#define PCH_UART_NR	PCH_UART_NR_GE

#define PCH_UART_HANDLED_RX_INT	(1<<((PCH_UART_HANDLED_RX_INT_SHIFT)<<1))
#define PCH_UART_HANDLED_TX_INT	(1<<((PCH_UART_HANDLED_TX_INT_SHIFT)<<1))
#define PCH_UART_HANDLED_RX_ERR_INT	(1<<((\
					PCH_UART_HANDLED_RX_ERR_INT_SHIFT)<<1))
#define PCH_UART_HANDLED_RX_TRG_INT	(1<<((\
					PCH_UART_HANDLED_RX_TRG_INT_SHIFT)<<1))
#define PCH_UART_HANDLED_MS_INT	(1<<((PCH_UART_HANDLED_MS_INT_SHIFT)<<1))

#define PCH_UART_RBR		0x00
#define PCH_UART_THR		0x00

#define PCH_UART_IER_MASK	(PCH_UART_IER_ERBFI|PCH_UART_IER_ETBEI|\
				PCH_UART_IER_ELSI|PCH_UART_IER_EDSSI)
#define PCH_UART_IER_ERBFI	0x00000001
#define PCH_UART_IER_ETBEI	0x00000002
#define PCH_UART_IER_ELSI	0x00000004
#define PCH_UART_IER_EDSSI	0x00000008

#define PCH_UART_IIR_IP			0x00000001
#define PCH_UART_IIR_IID		0x00000006
#define PCH_UART_IIR_MSI		0x00000000
#define PCH_UART_IIR_TRI		0x00000002
#define PCH_UART_IIR_RRI		0x00000004
#define PCH_UART_IIR_REI		0x00000006
#define PCH_UART_IIR_TOI		0x00000008
#define PCH_UART_IIR_FIFO256		0x00000020
#define PCH_UART_IIR_FIFO64		PCH_UART_IIR_FIFO256
#define PCH_UART_IIR_FE			0x000000C0

#define PCH_UART_FCR_FIFOE		0x00000001
#define PCH_UART_FCR_RFR		0x00000002
#define PCH_UART_FCR_TFR		0x00000004
#define PCH_UART_FCR_DMS		0x00000008
#define PCH_UART_FCR_FIFO256		0x00000020
#define PCH_UART_FCR_RFTL		0x000000C0

#define PCH_UART_FCR_RFTL1		0x00000000
#define PCH_UART_FCR_RFTL64		0x00000040
#define PCH_UART_FCR_RFTL128		0x00000080
#define PCH_UART_FCR_RFTL224		0x000000C0
#define PCH_UART_FCR_RFTL16		PCH_UART_FCR_RFTL64
#define PCH_UART_FCR_RFTL32		PCH_UART_FCR_RFTL128
#define PCH_UART_FCR_RFTL56		PCH_UART_FCR_RFTL224
#define PCH_UART_FCR_RFTL4		PCH_UART_FCR_RFTL64
#define PCH_UART_FCR_RFTL8		PCH_UART_FCR_RFTL128
#define PCH_UART_FCR_RFTL14		PCH_UART_FCR_RFTL224
#define PCH_UART_FCR_RFTL_SHIFT		6

#define PCH_UART_LCR_WLS	0x00000003
#define PCH_UART_LCR_STB	0x00000004
#define PCH_UART_LCR_PEN	0x00000008
#define PCH_UART_LCR_EPS	0x00000010