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77accbf5 JN |
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 <asm/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 | int baud; | |
40 | volatile u8 *port; /* R_SERIALx_CTRL */ | |
41 | u32 irq; /* bitnr in R_IRQ_MASK2 for dmaX_descr */ | |
42 | ||
43 | /* Output registers */ | |
44 | volatile u8 *oclrintradr; /* adr to R_DMA_CHx_CLR_INTR */ | |
45 | volatile u32 *ofirstadr; /* adr to R_DMA_CHx_FIRST */ | |
46 | volatile u8 *ocmdadr; /* adr to R_DMA_CHx_CMD */ | |
47 | const volatile u8 *ostatusadr; /* adr to R_DMA_CHx_STATUS */ | |
48 | ||
49 | /* Input registers */ | |
50 | volatile u8 *iclrintradr; /* adr to R_DMA_CHx_CLR_INTR */ | |
51 | volatile u32 *ifirstadr; /* adr to R_DMA_CHx_FIRST */ | |
52 | volatile u8 *icmdadr; /* adr to R_DMA_CHx_CMD */ | |
53 | volatile u32 *idescradr; /* adr to R_DMA_CHx_DESCR */ | |
54 | ||
55 | int flags; /* defined in tty.h */ | |
56 | ||
57 | u8 rx_ctrl; /* shadow for R_SERIALx_REC_CTRL */ | |
58 | u8 tx_ctrl; /* shadow for R_SERIALx_TR_CTRL */ | |
59 | u8 iseteop; /* bit number for R_SET_EOP for the input dma */ | |
60 | int enabled; /* Set to 1 if the port is enabled in HW config */ | |
61 | ||
62 | u8 dma_out_enabled; /* Set to 1 if DMA should be used */ | |
63 | u8 dma_in_enabled; /* Set to 1 if DMA should be used */ | |
64 | ||
65 | /* end of fields defined in rs_table[] in .c-file */ | |
66 | int dma_owner; | |
67 | unsigned int dma_in_nbr; | |
68 | unsigned int dma_out_nbr; | |
69 | unsigned int dma_in_irq_nbr; | |
70 | unsigned int dma_out_irq_nbr; | |
71 | unsigned long dma_in_irq_flags; | |
72 | unsigned long dma_out_irq_flags; | |
73 | char *dma_in_irq_description; | |
74 | char *dma_out_irq_description; | |
75 | ||
76 | enum cris_io_interface io_if; | |
77 | char *io_if_description; | |
78 | ||
79 | u8 uses_dma_in; /* Set to 1 if DMA is used */ | |
80 | u8 uses_dma_out; /* Set to 1 if DMA is used */ | |
81 | u8 forced_eop; /* a fifo eop has been forced */ | |
82 | int baud_base; /* For special baudrates */ | |
83 | int custom_divisor; /* For special baudrates */ | |
84 | struct etrax_dma_descr tr_descr; | |
85 | struct etrax_dma_descr rec_descr[SERIAL_RECV_DESCRIPTORS]; | |
86 | int cur_rec_descr; | |
87 | ||
88 | volatile int tr_running; /* 1 if output is running */ | |
89 | ||
90 | struct tty_struct *tty; | |
91 | int read_status_mask; | |
92 | int ignore_status_mask; | |
93 | int x_char; /* xon/xoff character */ | |
94 | int close_delay; | |
95 | unsigned short closing_wait; | |
96 | unsigned short closing_wait2; | |
97 | unsigned long event; | |
98 | unsigned long last_active; | |
99 | int line; | |
100 | int type; /* PORT_ETRAX */ | |
101 | int count; /* # of fd on device */ | |
102 | int blocked_open; /* # of blocked opens */ | |
103 | struct circ_buf xmit; | |
104 | struct etrax_recv_buffer *first_recv_buffer; | |
105 | struct etrax_recv_buffer *last_recv_buffer; | |
106 | unsigned int recv_cnt; | |
107 | unsigned int max_recv_cnt; | |
108 | ||
109 | struct work_struct work; | |
110 | struct async_icount icount; /* error-statistics etc.*/ | |
111 | struct ktermios normal_termios; | |
112 | struct ktermios callout_termios; | |
113 | wait_queue_head_t open_wait; | |
114 | wait_queue_head_t close_wait; | |
115 | ||
116 | unsigned long char_time_usec; /* The time for 1 char, in usecs */ | |
117 | unsigned long flush_time_usec; /* How often we should flush */ | |
118 | unsigned long last_tx_active_usec; /* Last tx usec in the jiffies */ | |
119 | unsigned long last_tx_active; /* Last tx time in jiffies */ | |
120 | unsigned long last_rx_active_usec; /* Last rx usec in the jiffies */ | |
121 | unsigned long last_rx_active; /* Last rx time in jiffies */ | |
122 | ||
123 | int break_detected_cnt; | |
124 | int errorcode; | |
125 | ||
126 | #ifdef CONFIG_ETRAX_RS485 | |
127 | struct rs485_control rs485; /* RS-485 support */ | |
128 | #endif | |
129 | }; | |
130 | ||
131 | /* this PORT is not in the standard serial.h. it's not actually used for | |
132 | * anything since we only have one type of async serial-port anyway in this | |
133 | * system. | |
134 | */ | |
135 | ||
136 | #define PORT_ETRAX 1 | |
137 | ||
138 | /* | |
139 | * Events are used to schedule things to happen at timer-interrupt | |
140 | * time, instead of at rs interrupt time. | |
141 | */ | |
142 | #define RS_EVENT_WRITE_WAKEUP 0 | |
143 | ||
144 | #endif /* __KERNEL__ */ | |
145 | ||
146 | #endif /* !_ETRAX_SERIAL_H */ |