1/* 2 * serial.h: Arch-dep definitions for the Etrax100 serial driver. 3 * 4 * Copyright (C) 1998-2007 Axis Communications AB 5 */ 6 7#ifndef _ETRAX_SERIAL_H 8#define _ETRAX_SERIAL_H 9 10#include <linux/circ_buf.h> 11#include <asm/termios.h> 12#include <asm/dma.h> 13#include <arch/io_interface_mux.h> 14 15/* Software state per channel */ 16 17#ifdef __KERNEL__ 18/* 19 * This is our internal structure for each serial port's state. 20 * 21 * Many fields are paralleled by the structure used by the serial_struct 22 * structure. 23 * 24 * For definitions of the flags field, see tty.h 25 */ 26 27#define SERIAL_RECV_DESCRIPTORS 8 28 29struct etrax_recv_buffer { 30 struct etrax_recv_buffer *next; 31 unsigned short length; 32 unsigned char error; 33 unsigned char pad; 34 35 unsigned char buffer[0]; 36}; 37 38struct e100_serial { 39 struct tty_port port; 40 int baud; 41 volatile u8 *ioport; /* R_SERIALx_CTRL */ 42 u32 irq; /* bitnr in R_IRQ_MASK2 for dmaX_descr */ 43 44 /* Output registers */ 45 volatile u8 *oclrintradr; /* adr to R_DMA_CHx_CLR_INTR */ 46 volatile u32 *ofirstadr; /* adr to R_DMA_CHx_FIRST */ 47 volatile u8 *ocmdadr; /* adr to R_DMA_CHx_CMD */ 48 const volatile u8 *ostatusadr; /* adr to R_DMA_CHx_STATUS */ 49 50 /* Input registers */ 51 volatile u8 *iclrintradr; /* adr to R_DMA_CHx_CLR_INTR */ 52 volatile u32 *ifirstadr; /* adr to R_DMA_CHx_FIRST */ 53 volatile u8 *icmdadr; /* adr to R_DMA_CHx_CMD */ 54 volatile u32 *idescradr; /* adr to R_DMA_CHx_DESCR */ 55 56 int flags; /* defined in tty.h */ 57 58 u8 rx_ctrl; /* shadow for R_SERIALx_REC_CTRL */ 59 u8 tx_ctrl; /* shadow for R_SERIALx_TR_CTRL */ 60 u8 iseteop; /* bit number for R_SET_EOP for the input dma */ 61 int enabled; /* Set to 1 if the port is enabled in HW config */ 62 63 u8 dma_out_enabled; /* Set to 1 if DMA should be used */ 64 u8 dma_in_enabled; /* Set to 1 if DMA should be used */ 65 66 /* end of fields defined in rs_table[] in .c-file */ 67 int dma_owner; 68 unsigned int dma_in_nbr; 69 unsigned int dma_out_nbr; 70 unsigned int dma_in_irq_nbr; 71 unsigned int dma_out_irq_nbr; 72 unsigned long dma_in_irq_flags; 73 unsigned long dma_out_irq_flags; 74 char *dma_in_irq_description; 75 char *dma_out_irq_description; 76 77 enum cris_io_interface io_if; 78 char *io_if_description; 79 80 u8 uses_dma_in; /* Set to 1 if DMA is used */ 81 u8 uses_dma_out; /* Set to 1 if DMA is used */ 82 u8 forced_eop; /* a fifo eop has been forced */ 83 int baud_base; /* For special baudrates */ 84 int custom_divisor; /* For special baudrates */ 85 struct etrax_dma_descr tr_descr; 86 struct etrax_dma_descr rec_descr[SERIAL_RECV_DESCRIPTORS]; 87 int cur_rec_descr; 88 89 volatile int tr_running; /* 1 if output is running */ 90 91 struct tty_struct *tty; 92 int read_status_mask; 93 int ignore_status_mask; 94 int x_char; /* xon/xoff character */ 95 int close_delay; 96 unsigned short closing_wait; 97 unsigned short closing_wait2; 98 unsigned long event; 99 unsigned long last_active; 100 int line; 101 int type; /* PORT_ETRAX */ 102 int count; /* # of fd on device */ 103 int blocked_open; /* # of blocked opens */ 104 struct circ_buf xmit; 105 struct etrax_recv_buffer *first_recv_buffer; 106 struct etrax_recv_buffer *last_recv_buffer; 107 unsigned int recv_cnt; 108 unsigned int max_recv_cnt; 109 110 struct work_struct work; 111 struct async_icount icount; /* error-statistics etc.*/ 112 struct ktermios normal_termios; 113 struct ktermios callout_termios; 114 wait_queue_head_t open_wait; 115 wait_queue_head_t close_wait; 116 117 unsigned long char_time_usec; /* The time for 1 char, in usecs */ 118 unsigned long flush_time_usec; /* How often we should flush */ 119 unsigned long last_tx_active_usec; /* Last tx usec in the jiffies */ 120 unsigned long last_tx_active; /* Last tx time in jiffies */ 121 unsigned long last_rx_active_usec; /* Last rx usec in the jiffies */ 122 unsigned long last_rx_active; /* Last rx time in jiffies */ 123 124 int break_detected_cnt; 125 int errorcode; 126 127#ifdef CONFIG_ETRAX_RS485 128 struct serial_rs485 rs485; /* RS-485 support */ 129#endif 130}; 131 132/* this PORT is not in the standard serial.h. it's not actually used for 133 * anything since we only have one type of async serial-port anyway in this 134 * system. 135 */ 136 137#define PORT_ETRAX 1 138 139/* 140 * Events are used to schedule things to happen at timer-interrupt 141 * time, instead of at rs interrupt time. 142 */ 143#define RS_EVENT_WRITE_WAKEUP 0 144 145#endif /* __KERNEL__ */ 146 147#endif /* !_ETRAX_SERIAL_H */ 148