ia64/linux-2.6.18-xen.hg

view drivers/serial/68328serial.h @ 893:f994bfe9b93b

linux/blktap2: reduce TLB flush scope

c/s 885 added very coarse TLB flushing. Since these flushes always
follow single page updates, single page flushes (when available) are
sufficient.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Jun 04 10:32:57 2009 +0100 (2009-06-04)
parents 831230e53067
children
line source
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 */
11 #ifndef _MC683XX_SERIAL_H
12 #define _MC683XX_SERIAL_H
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 };
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
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 */
48 #define S_SPD_MASK 0x0030
49 #define S_SPD_HI 0x0010 /* Use 56000 instead of 38400 bps */
51 #define S_SPD_VHI 0x0020 /* Use 115200 instead of 38400 bps */
52 #define S_SPD_CUST 0x0030 /* Use user-specified divisor */
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 */
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 */
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 */
73 /* Software state per channel */
75 #ifdef __KERNEL__
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)
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 */
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) */
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 */
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. */
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 };
168 #define SERIAL_MAGIC 0x5301
170 /*
171 * The size of the serial xmit buffer is 1 page, or 4096 bytes
172 */
173 #define SERIAL_XMIT_SIZE 4096
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
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
192 #endif /* __KERNEL__ */
193 #endif /* !(_MC683XX_SERIAL_H) */