CRISv10 serial driver rewrite

New and improved serial driver for CRISv10, take three, with improvements
suggested by Jiri Slaby.

- Call wait_event_interruptible with a _correct_ and sensible condition.
- Removed superfluous test of info->flags & ASYNC_CLOSING, since that is done
  by wait_event_interruptible.
- Moved common code for deregistering DMA and IRQ to deinit_port function.
- Use setup_timer when initializing flush_timer.
- Convert bit-field for uses_dma_in and uses_dma_out to regular bytes.
- Removed CVS tags.
- Removed defines and comments for CRIS_BUF_SIZE and TTY_THRESHOLD_THROTTLE
  (no longer used).
- Cleaned up code to pass checkpatch.
- Add crisv10.h header file.
- Merge of CRISv10 from Axis internal CVS.
Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
Reviewed-by: Jiri Slaby <jirislaby@gmail.com>
Cc: Mikael Starvik <starvik@axis.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/serial/crisv10.h

+/*
+ * serial.h: Arch-dep definitions for the Etrax100 serial driver.
+ *
+ * Copyright (C) 1998-2007 Axis Communications AB
+ */
+
+#ifndef _ETRAX_SERIAL_H
+#define _ETRAX_SERIAL_H
+
+#include <linux/circ_buf.h>
+#include <asm/termios.h>
+#include <asm/dma.h>
+#include <asm/arch/io_interface_mux.h>
+
+/* Software state per channel */
+
+#ifdef __KERNEL__
+/*
+ * This is our internal structure for each serial port's state.
+ *
+ * Many fields are paralleled by the structure used by the serial_struct
+ * structure.
+ *
+ * For definitions of the flags field, see tty.h
+ */
+
+#define SERIAL_RECV_DESCRIPTORS 8
+
+struct etrax_recv_buffer {
+	struct etrax_recv_buffer *next;
+	unsigned short length;
+	unsigned char error;
+	unsigned char pad;
+
+	unsigned char buffer[0];
+};
+
+struct e100_serial {
+	int baud;
+	volatile u8	*port;	/* R_SERIALx_CTRL */
+	u32		irq;	/* bitnr in R_IRQ_MASK2 for dmaX_descr */
+
+	/* Output registers */
+	volatile u8 *oclrintradr;	/* adr to R_DMA_CHx_CLR_INTR */
+	volatile u32 *ofirstadr;	/* adr to R_DMA_CHx_FIRST */
+	volatile u8 *ocmdadr;		/* adr to R_DMA_CHx_CMD */
+	const volatile u8 *ostatusadr;	/* adr to R_DMA_CHx_STATUS */
+
+	/* Input registers */
+	volatile u8 *iclrintradr;	/* adr to R_DMA_CHx_CLR_INTR */
+	volatile u32 *ifirstadr;	/* adr to R_DMA_CHx_FIRST */
+	volatile u8 *icmdadr;		/* adr to R_DMA_CHx_CMD */
+	volatile u32 *idescradr;	/* adr to R_DMA_CHx_DESCR */
+
+	int flags;	/* defined in tty.h */
+
+	u8 rx_ctrl;	/* shadow for R_SERIALx_REC_CTRL */
+	u8 tx_ctrl;	/* shadow for R_SERIALx_TR_CTRL */
+	u8 iseteop;	/* bit number for R_SET_EOP for the input dma */
+	int enabled;	/* Set to 1 if the port is enabled in HW config */
+
+	u8 dma_out_enabled;	/* Set to 1 if DMA should be used */
+	u8 dma_in_enabled;	/* Set to 1 if DMA should be used */
+
+	/* end of fields defined in rs_table[] in .c-file */
+	int		dma_owner;
+	unsigned int	dma_in_nbr;
+	unsigned int	dma_out_nbr;
+	unsigned int	dma_in_irq_nbr;
+	unsigned int	dma_out_irq_nbr;
+	unsigned long	dma_in_irq_flags;
+	unsigned long	dma_out_irq_flags;
+	char		*dma_in_irq_description;
+	char		*dma_out_irq_description;
+
+	enum cris_io_interface io_if;
+	char            *io_if_description;
+
+	u8		uses_dma_in;  /* Set to 1 if DMA is used */
+	u8		uses_dma_out; /* Set to 1 if DMA is used */
+	u8		forced_eop;   /* a fifo eop has been forced */
+	int			baud_base;     /* For special baudrates */
+	int			custom_divisor; /* For special baudrates */
+	struct etrax_dma_descr	tr_descr;
+	struct etrax_dma_descr	rec_descr[SERIAL_RECV_DESCRIPTORS];
+	int			cur_rec_descr;
+
+	volatile int		tr_running; /* 1 if output is running */
+
+	struct tty_struct	*tty;
+	int			read_status_mask;
+	int			ignore_status_mask;
+	int			x_char;	/* xon/xoff character */
+	int			close_delay;
+	unsigned short		closing_wait;
+	unsigned short		closing_wait2;
+	unsigned long		event;
+	unsigned long		last_active;
+	int			line;
+	int			type;  /* PORT_ETRAX */
+	int			count;	    /* # of fd on device */
+	int			blocked_open; /* # of blocked opens */
+	struct circ_buf		xmit;
+	struct etrax_recv_buffer *first_recv_buffer;
+	struct etrax_recv_buffer *last_recv_buffer;
+	unsigned int		recv_cnt;
+	unsigned int		max_recv_cnt;
+
+	struct work_struct	work;
+	struct async_icount	icount;   /* error-statistics etc.*/
+	struct ktermios		normal_termios;
+	struct ktermios		callout_termios;
+	wait_queue_head_t	open_wait;
+	wait_queue_head_t	close_wait;
+
+	unsigned long char_time_usec;       /* The time for 1 char, in usecs */
+	unsigned long flush_time_usec;      /* How often we should flush */
+	unsigned long last_tx_active_usec;  /* Last tx usec in the jiffies */
+	unsigned long last_tx_active;       /* Last tx time in jiffies */
+	unsigned long last_rx_active_usec;  /* Last rx usec in the jiffies */
+	unsigned long last_rx_active;       /* Last rx time in jiffies */
+
+	int break_detected_cnt;
+	int errorcode;
+
+#ifdef CONFIG_ETRAX_RS485
+	struct rs485_control	rs485;  /* RS-485 support */
+#endif
+};
+
+/* this PORT is not in the standard serial.h. it's not actually used for
+ * anything since we only have one type of async serial-port anyway in this
+ * system.
+ */
+
+#define PORT_ETRAX 1
+
+/*
+ * Events are used to schedule things to happen at timer-interrupt
+ * time, instead of at rs interrupt time.
+ */
+#define RS_EVENT_WRITE_WAKEUP	0
+
+#endif /* __KERNEL__ */
+
+#endif /* !_ETRAX_SERIAL_H */