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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/drivers/char/8250.h
3 *
4 * Driver for 8250/16550-type serial ports
5 *
6 * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
7 *
8 * Copyright (C) 2001 Russell King.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 */
15
Russell Kingbc49a662005-09-01 15:56:26 +010016#include <linux/serial_8250.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
18struct old_serial_port {
19 unsigned int uart;
20 unsigned int baud_base;
21 unsigned int port;
22 unsigned int irq;
23 unsigned int flags;
24 unsigned char hub6;
25 unsigned char io_type;
26 unsigned char *iomem_base;
27 unsigned short iomem_reg_shift;
Vikram Pandita1c2f0492009-09-19 13:13:19 -070028 unsigned long irqflags;
Linus Torvalds1da177e2005-04-16 15:20:36 -070029};
30
31/*
32 * This replaces serial_uart_config in include/linux/serial.h
33 */
34struct serial8250_config {
35 const char *name;
36 unsigned short fifo_size;
37 unsigned short tx_loadsz;
38 unsigned char fcr;
39 unsigned int flags;
40};
41
42#define UART_CAP_FIFO (1 << 8) /* UART has FIFO */
43#define UART_CAP_EFR (1 << 9) /* UART has EFR */
44#define UART_CAP_SLEEP (1 << 10) /* UART has IER sleep */
45#define UART_CAP_AFE (1 << 11) /* MCR-based hw flow control */
46#define UART_CAP_UUE (1 << 12) /* UART needs IER bit 6 set (Xscale) */
47
Russell King4ba5e352005-06-23 10:43:04 +010048#define UART_BUG_QUOT (1 << 0) /* UART has buggy quot LSB */
Russell King55d3b282005-06-23 15:05:41 +010049#define UART_BUG_TXEN (1 << 1) /* UART has buggy TX IIR status */
Pantelis Antoniou21c614a2005-11-06 09:07:03 +000050#define UART_BUG_NOMSR (1 << 2) /* UART has buggy MSR status bits (Au1x00) */
Will Newton363f66f2008-09-02 14:35:44 -070051#define UART_BUG_THRE (1 << 3) /* UART has buggy THRE reassertion */
Russell King4ba5e352005-06-23 10:43:04 +010052
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#define PROBE_RSA (1 << 0)
54#define PROBE_ANY (~0)
55
56#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
57
58#ifdef CONFIG_SERIAL_8250_SHARE_IRQ
59#define SERIAL8250_SHARE_IRQS 1
60#else
61#define SERIAL8250_SHARE_IRQS 0
62#endif
63
64#if defined(__alpha__) && !defined(CONFIG_PCI)
65/*
66 * Digital did something really horribly wrong with the OUT1 and OUT2
67 * lines on at least some ALPHA's. The failure mode is that if either
68 * is cleared, the machine locks up with endless interrupts.
69 */
70#define ALPHA_KLUDGE_MCR (UART_MCR_OUT2 | UART_MCR_OUT1)
71#elif defined(CONFIG_SBC8560)
72/*
73 * WindRiver did something similarly broken on their SBC8560 board. The
74 * UART tristates its IRQ output while OUT2 is clear, but they pulled
75 * the interrupt line _up_ instead of down, so if we register the IRQ
76 * while the UART is in that state, we die in an IRQ storm. */
77#define ALPHA_KLUDGE_MCR (UART_MCR_OUT2)
78#else
79#define ALPHA_KLUDGE_MCR 0
80#endif