/*
 * Blackfin On-Chip Sport Emulated UART Driver
 *
 * Copyright 2006-2008 Analog Devices Inc.
 *
 * Enter bugs at http://blackfin.uclinux.org/
 *
 * Licensed under the GPL-2 or later.
 */

/*
 * This driver and the hardware supported are in term of EE-191 of ADI.
 * http://www.analog.com/static/imported-files/application_notes/EE191.pdf 
 * This application note describe how to implement a UART on a Sharc DSP,
 * but this driver is implemented on Blackfin Processor.
 * Transmit Frame Sync is not used by this driver to transfer data out.
 */

#ifndef _BFIN_SPORT_UART_H
#define _BFIN_SPORT_UART_H

#define OFFSET_TCR1		0x00	/* Transmit Configuration 1 Register */
#define OFFSET_TCR2		0x04	/* Transmit Configuration 2 Register */
#define OFFSET_TCLKDIV		0x08	/* Transmit Serial Clock Divider Register */
#define OFFSET_TFSDIV		0x0C	/* Transmit Frame Sync Divider Register */
#define OFFSET_TX		0x10	/* Transmit Data Register		*/
#define OFFSET_RX		0x18	/* Receive Data Register		*/
#define OFFSET_RCR1		0x20	/* Receive Configuration 1 Register	*/
#define OFFSET_RCR2		0x24	/* Receive Configuration 2 Register	*/
#define OFFSET_RCLKDIV		0x28	/* Receive Serial Clock Divider Register */
#define OFFSET_RFSDIV		0x2c	/* Receive Frame Sync Divider Register */
#define OFFSET_STAT		0x30	/* Status Register			*/

#define SPORT_GET_TCR1(sport)		bfin_read16(((sport)->port.membase + OFFSET_TCR1))
#define SPORT_GET_TCR2(sport)		bfin_read16(((sport)->port.membase + OFFSET_TCR2))
#define SPORT_GET_TCLKDIV(sport)	bfin_read16(((sport)->port.membase + OFFSET_TCLKDIV))
#define SPORT_GET_TFSDIV(sport)		bfin_read16(((sport)->port.membase + OFFSET_TFSDIV))
#define SPORT_GET_TX(sport)		bfin_read16(((sport)->port.membase + OFFSET_TX))
#define SPORT_GET_RX(sport)		bfin_read16(((sport)->port.membase + OFFSET_RX))
/*
 * If another interrupt fires while doing a 32-bit read from RX FIFO,
 * a fake RX underflow error will be generated.  So disable interrupts
 * to prevent interruption while reading the FIFO.
 */
#define SPORT_GET_RX32(sport) \
({ \
	unsigned int __ret; \
	unsigned long flags; \
	if (ANOMALY_05000473) \
		local_irq_save(flags); \
	__ret = bfin_read32((sport)->port.membase + OFFSET_RX); \
	if (ANOMALY_05000473) \
		local_irq_restore(flags); \
	__ret; \
})
#define SPORT_GET_RCR1(sport)		bfin_read16(((sport)->port.membase + OFFSET_RCR1))
#define SPORT_GET_RCR2(sport)		bfin_read16(((sport)->port.membase + OFFSET_RCR2))
#define SPORT_GET_RCLKDIV(sport)	bfin_read16(((sport)->port.membase + OFFSET_RCLKDIV))
#define SPORT_GET_RFSDIV(sport)		bfin_read16(((sport)->port.membase + OFFSET_RFSDIV))
#define SPORT_GET_STAT(sport)		bfin_read16(((sport)->port.membase + OFFSET_STAT))

#define SPORT_PUT_TCR1(sport, v)	bfin_write16(((sport)->port.membase + OFFSET_TCR1), v)
#define SPORT_PUT_TCR2(sport, v)	bfin_write16(((sport)->port.membase + OFFSET_TCR2), v)
#define SPORT_PUT_TCLKDIV(sport, v)	bfin_write16(((sport)->port.membase + OFFSET_TCLKDIV), v)
#define SPORT_PUT_TFSDIV(sport, v)	bfin_write16(((sport)->port.membase + OFFSET_TFSDIV), v)
#define SPORT_PUT_TX(sport, v)		bfin_write16(((sport)->port.membase + OFFSET_TX), v)
#define SPORT_PUT_RX(sport, v)		bfin_write16(((sport)->port.membase + OFFSET_RX), v)
#define SPORT_PUT_RCR1(sport, v)	bfin_write16(((sport)->port.membase + OFFSET_RCR1), v)
#define SPORT_PUT_RCR2(sport, v)	bfin_write16(((sport)->port.membase + OFFSET_RCR2), v)
#define SPORT_PUT_RCLKDIV(sport, v)	bfin_write16(((sport)->port.membase + OFFSET_RCLKDIV), v)
#define SPORT_PUT_RFSDIV(sport, v)	bfin_write16(((sport)->port.membase + OFFSET_RFSDIV), v)
#define SPORT_PUT_STAT(sport, v)	bfin_write16(((sport)->port.membase + OFFSET_STAT), v)

#define SPORT_TX_FIFO_SIZE	8

#define SPORT_UART_GET_CTS(x)		gpio_get_value(x->cts_pin)
#define SPORT_UART_DISABLE_RTS(x)	gpio_set_value(x->rts_pin, 1)
#define SPORT_UART_ENABLE_RTS(x)	gpio_set_value(x->rts_pin, 0)

#if defined(CONFIG_SERIAL_BFIN_SPORT0_UART_CTSRTS) \
	|| defined(CONFIG_SERIAL_BFIN_SPORT1_UART_CTSRTS) \
	|| defined(CONFIG_SERIAL_BFIN_SPORT2_UART_CTSRTS) \
	|| defined(CONFIG_SERIAL_BFIN_SPORT3_UART_CTSRTS)
# define CONFIG_SERIAL_BFIN_SPORT_CTSRTS
#endif

#endif /* _BFIN_SPORT_UART_H */