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crisv10.h
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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 
29 struct 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 
38 struct 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 */
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