134 lines
3.8 KiB
C
134 lines
3.8 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* serial.h: Arch-dep definitions for the Etrax100 serial driver.
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*
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* Copyright (C) 1998-2007 Axis Communications AB
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*/
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#ifndef _ETRAX_SERIAL_H
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#define _ETRAX_SERIAL_H
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#include <linux/circ_buf.h>
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#include <asm/termios.h>
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#include <asm/dma.h>
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#include <arch/io_interface_mux.h>
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/* Software state per channel */
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#ifdef __KERNEL__
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/*
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* This is our internal structure for each serial port's state.
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*
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* Many fields are paralleled by the structure used by the serial_struct
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* structure.
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*
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* For definitions of the flags field, see tty.h
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*/
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#define SERIAL_RECV_DESCRIPTORS 8
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struct etrax_recv_buffer {
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struct etrax_recv_buffer *next;
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unsigned short length;
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unsigned char error;
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unsigned char pad;
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unsigned char buffer[0];
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};
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struct e100_serial {
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struct tty_port port;
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int baud;
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volatile u8 *ioport; /* R_SERIALx_CTRL */
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u32 irq; /* bitnr in R_IRQ_MASK2 for dmaX_descr */
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/* Output registers */
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volatile u8 *oclrintradr; /* adr to R_DMA_CHx_CLR_INTR */
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volatile u32 *ofirstadr; /* adr to R_DMA_CHx_FIRST */
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volatile u8 *ocmdadr; /* adr to R_DMA_CHx_CMD */
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const volatile u8 *ostatusadr; /* adr to R_DMA_CHx_STATUS */
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/* Input registers */
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volatile u8 *iclrintradr; /* adr to R_DMA_CHx_CLR_INTR */
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volatile u32 *ifirstadr; /* adr to R_DMA_CHx_FIRST */
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volatile u8 *icmdadr; /* adr to R_DMA_CHx_CMD */
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volatile u32 *idescradr; /* adr to R_DMA_CHx_DESCR */
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u8 rx_ctrl; /* shadow for R_SERIALx_REC_CTRL */
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u8 tx_ctrl; /* shadow for R_SERIALx_TR_CTRL */
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u8 iseteop; /* bit number for R_SET_EOP for the input dma */
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int enabled; /* Set to 1 if the port is enabled in HW config */
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u8 dma_out_enabled; /* Set to 1 if DMA should be used */
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u8 dma_in_enabled; /* Set to 1 if DMA should be used */
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/* end of fields defined in rs_table[] in .c-file */
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int dma_owner;
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unsigned int dma_in_nbr;
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unsigned int dma_out_nbr;
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unsigned int dma_in_irq_nbr;
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unsigned int dma_out_irq_nbr;
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unsigned long dma_in_irq_flags;
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unsigned long dma_out_irq_flags;
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char *dma_in_irq_description;
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char *dma_out_irq_description;
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enum cris_io_interface io_if;
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char *io_if_description;
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u8 uses_dma_in; /* Set to 1 if DMA is used */
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u8 uses_dma_out; /* Set to 1 if DMA is used */
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u8 forced_eop; /* a fifo eop has been forced */
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int baud_base; /* For special baudrates */
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int custom_divisor; /* For special baudrates */
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struct etrax_dma_descr tr_descr;
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struct etrax_dma_descr rec_descr[SERIAL_RECV_DESCRIPTORS];
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int cur_rec_descr;
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volatile int tr_running; /* 1 if output is running */
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int x_char; /* xon/xoff character */
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unsigned long event;
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int line;
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int type; /* PORT_ETRAX */
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struct circ_buf xmit;
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struct etrax_recv_buffer *first_recv_buffer;
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struct etrax_recv_buffer *last_recv_buffer;
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unsigned int recv_cnt;
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unsigned int max_recv_cnt;
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struct work_struct work;
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struct async_icount icount; /* error-statistics etc.*/
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unsigned long char_time_usec; /* The time for 1 char, in usecs */
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unsigned long flush_time_usec; /* How often we should flush */
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unsigned long last_tx_active_usec; /* Last tx usec in the jiffies */
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unsigned long last_tx_active; /* Last tx time in jiffies */
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unsigned long last_rx_active_usec; /* Last rx usec in the jiffies */
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unsigned long last_rx_active; /* Last rx time in jiffies */
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int break_detected_cnt;
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int errorcode;
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#ifdef CONFIG_ETRAX_RS485
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struct serial_rs485 rs485; /* RS-485 support */
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#endif
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};
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/* this PORT is not in the standard serial.h. it's not actually used for
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* anything since we only have one type of async serial-port anyway in this
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* system.
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*/
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#define PORT_ETRAX 1
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/*
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* Events are used to schedule things to happen at timer-interrupt
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* time, instead of at rs interrupt time.
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*/
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#define RS_EVENT_WRITE_WAKEUP 0
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#endif /* __KERNEL__ */
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#endif /* !_ETRAX_SERIAL_H */
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