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1 | /* 68328serial.h: Definitions for the mc68328 serial driver. |
2 | * |
3 | * Copyright (C) 1995 David S. Miller <davem@caip.rutgers.edu> |
4 | * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com> |
5 | * Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@uclinux.org> |
6 | * Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com> |
7 | * |
8 | * VZ Support/Fixes Evan Stawnyczy <e@lineo.ca> |
9 | */ |
10 | |
11 | #ifndef _MC683XX_SERIAL_H |
12 | #define _MC683XX_SERIAL_H |
13 | |
14 | |
15 | struct serial_struct { |
16 | int type; |
17 | int line; |
18 | int port; |
19 | int irq; |
20 | int flags; |
21 | int xmit_fifo_size; |
22 | int custom_divisor; |
23 | int baud_base; |
24 | unsigned short close_delay; |
25 | char reserved_char[2]; |
26 | int hub6; /* FIXME: We don't have AT&T Hub6 boards! */ |
27 | unsigned short closing_wait; /* time to wait before closing */ |
28 | unsigned short closing_wait2; /* no longer used... */ |
29 | int reserved[4]; |
30 | }; |
31 | |
32 | /* |
33 | * For the close wait times, 0 means wait forever for serial port to |
34 | * flush its output. 65535 means don't wait at all. |
35 | */ |
36 | #define S_CLOSING_WAIT_INF 0 |
37 | #define S_CLOSING_WAIT_NONE 65535 |
38 | |
39 | /* |
40 | * Definitions for S_struct (and serial_struct) flags field |
41 | */ |
42 | #define S_HUP_NOTIFY 0x0001 /* Notify getty on hangups and closes |
43 | on the callout port */ |
44 | #define S_FOURPORT 0x0002 /* Set OU1, OUT2 per AST Fourport settings */ |
45 | #define S_SAK 0x0004 /* Secure Attention Key (Orange book) */ |
46 | #define S_SPLIT_TERMIOS 0x0008 /* Separate termios for dialin/callout */ |
47 | |
48 | #define S_SPD_MASK 0x0030 |
49 | #define S_SPD_HI 0x0010 /* Use 56000 instead of 38400 bps */ |
50 | |
51 | #define S_SPD_VHI 0x0020 /* Use 115200 instead of 38400 bps */ |
52 | #define S_SPD_CUST 0x0030 /* Use user-specified divisor */ |
53 | |
54 | #define S_SKIP_TEST 0x0040 /* Skip UART test during autoconfiguration */ |
55 | #define S_AUTO_IRQ 0x0080 /* Do automatic IRQ during autoconfiguration */ |
56 | #define S_SESSION_LOCKOUT 0x0100 /* Lock out cua opens based on session */ |
57 | #define S_PGRP_LOCKOUT 0x0200 /* Lock out cua opens based on pgrp */ |
58 | #define S_CALLOUT_NOHUP 0x0400 /* Don't do hangups for cua device */ |
59 | |
60 | #define S_FLAGS 0x0FFF /* Possible legal S flags */ |
61 | #define S_USR_MASK 0x0430 /* Legal flags that non-privileged |
62 | * users can set or reset */ |
63 | |
64 | /* Internal flags used only by kernel/chr_drv/serial.c */ |
65 | #define S_INITIALIZED 0x80000000 /* Serial port was initialized */ |
66 | #define S_CALLOUT_ACTIVE 0x40000000 /* Call out device is active */ |
67 | #define S_NORMAL_ACTIVE 0x20000000 /* Normal device is active */ |
68 | #define S_BOOT_AUTOCONF 0x10000000 /* Autoconfigure port on bootup */ |
69 | #define S_CLOSING 0x08000000 /* Serial port is closing */ |
70 | #define S_CTS_FLOW 0x04000000 /* Do CTS flow control */ |
71 | #define S_CHECK_CD 0x02000000 /* i.e., CLOCAL */ |
72 | |
73 | /* Software state per channel */ |
74 | |
75 | #ifdef __KERNEL__ |
76 | |
77 | /* |
78 | * I believe this is the optimal setting that reduces the number of interrupts. |
79 | * At high speeds the output might become a little "bursted" (use USTCNT_TXHE |
80 | * if that bothers you), but in most cases it will not, since we try to |
81 | * transmit characters every time rs_interrupt is called. Thus, quite often |
82 | * you'll see that a receive interrupt occures before the transmit one. |
83 | * -- Vladimir Gurevich |
84 | */ |
85 | #define USTCNT_TX_INTR_MASK (USTCNT_TXEE) |
86 | |
87 | /* |
88 | * 68328 and 68EZ328 UARTS are a little bit different. EZ328 has special |
89 | * "Old data interrupt" which occures whenever the data stay in the FIFO |
90 | * longer than 30 bits time. This allows us to use FIFO without compromising |
91 | * latency. '328 does not have this feature and without the real 328-based |
92 | * board I would assume that RXRE is the safest setting. |
93 | * |
94 | * For EZ328 I use RXHE (Half empty) interrupt to reduce the number of |
95 | * interrupts. RXFE (receive queue full) causes the system to lose data |
96 | * at least at 115200 baud |
97 | * |
98 | * If your board is busy doing other stuff, you might consider to use |
99 | * RXRE (data ready intrrupt) instead. |
100 | * |
101 | * The other option is to make these INTR masks run-time configurable, so |
102 | * that people can dynamically adapt them according to the current usage. |
103 | * -- Vladimir Gurevich |
104 | */ |
105 | |
106 | /* (es) */ |
107 | #if defined(CONFIG_M68EZ328) || defined(CONFIG_M68VZ328) |
108 | #define USTCNT_RX_INTR_MASK (USTCNT_RXHE | USTCNT_ODEN) |
109 | #elif defined(CONFIG_M68328) |
110 | #define USTCNT_RX_INTR_MASK (USTCNT_RXRE) |
111 | #else |
112 | #error Please, define the Rx interrupt events for your CPU |
113 | #endif |
114 | /* (/es) */ |
115 | |
116 | /* |
117 | * This is our internal structure for each serial port's state. |
118 | * |
119 | * Many fields are paralleled by the structure used by the serial_struct |
120 | * structure. |
121 | * |
122 | * For definitions of the flags field, see tty.h |
123 | */ |
124 | |
125 | struct m68k_serial { |
126 | char soft_carrier; /* Use soft carrier on this channel */ |
127 | char break_abort; /* Is serial console in, so process brk/abrt */ |
128 | char is_cons; /* Is this our console. */ |
129 | |
130 | /* We need to know the current clock divisor |
131 | * to read the bps rate the chip has currently |
132 | * loaded. |
133 | */ |
134 | unsigned char clk_divisor; /* May be 1, 16, 32, or 64 */ |
135 | int baud; |
136 | int magic; |
137 | int baud_base; |
138 | int port; |
139 | int irq; |
140 | int flags; /* defined in tty.h */ |
141 | int type; /* UART type */ |
142 | struct tty_struct *tty; |
143 | int read_status_mask; |
144 | int ignore_status_mask; |
145 | int timeout; |
146 | int xmit_fifo_size; |
147 | int custom_divisor; |
148 | int x_char; /* xon/xoff character */ |
149 | int close_delay; |
150 | unsigned short closing_wait; |
151 | unsigned short closing_wait2; |
152 | unsigned long event; |
153 | unsigned long last_active; |
154 | int line; |
155 | int count; /* # of fd on device */ |
156 | int blocked_open; /* # of blocked opens */ |
157 | unsigned char *xmit_buf; |
158 | int xmit_head; |
159 | int xmit_tail; |
160 | int xmit_cnt; |
161 | struct work_struct tqueue; |
162 | struct work_struct tqueue_hangup; |
163 | wait_queue_head_t open_wait; |
164 | wait_queue_head_t close_wait; |
165 | }; |
166 | |
167 | |
168 | #define SERIAL_MAGIC 0x5301 |
169 | |
170 | /* |
171 | * The size of the serial xmit buffer is 1 page, or 4096 bytes |
172 | */ |
173 | #define SERIAL_XMIT_SIZE 4096 |
174 | |
175 | /* |
176 | * Events are used to schedule things to happen at timer-interrupt |
177 | * time, instead of at rs interrupt time. |
178 | */ |
179 | #define RS_EVENT_WRITE_WAKEUP 0 |
180 | |
181 | /* |
182 | * Define the number of ports supported and their irqs. |
183 | */ |
184 | #ifndef CONFIG_68328_SERIAL_UART2 |
185 | #define NR_PORTS 1 |
186 | #define UART_IRQ_DEFNS {UART_IRQ_NUM} |
187 | #else |
188 | #define NR_PORTS 2 |
189 | #define UART_IRQ_DEFNS {UART1_IRQ_NUM, UART2_IRQ_NUM} |
190 | #endif |
191 | |
192 | #endif /* __KERNEL__ */ |
193 | #endif /* !(_MC683XX_SERIAL_H) */ |
194 |
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