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 */
148
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