1/*
 2 *  Driver for 8250/16550-type serial ports
 3 *
 4 *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
 5 *
 6 *  Copyright (C) 2001 Russell King.
 7 *
 8 * This program is free software; you can redistribute it and/or modify
 9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14#include <linux/serial_8250.h>
15
16struct old_serial_port {
17	unsigned int uart;
18	unsigned int baud_base;
19	unsigned int port;
20	unsigned int irq;
21	unsigned int flags;
22	unsigned char hub6;
23	unsigned char io_type;
24	unsigned char *iomem_base;
25	unsigned short iomem_reg_shift;
26	unsigned long irqflags;
27};
28
29/*
30 * This replaces serial_uart_config in include/linux/serial.h
31 */
32struct serial8250_config {
33	const char	*name;
34	unsigned short	fifo_size;
35	unsigned short	tx_loadsz;
36	unsigned char	fcr;
37	unsigned int	flags;
38};
39
40#define UART_CAP_FIFO	(1 << 8)	/* UART has FIFO */
41#define UART_CAP_EFR	(1 << 9)	/* UART has EFR */
42#define UART_CAP_SLEEP	(1 << 10)	/* UART has IER sleep */
43#define UART_CAP_AFE	(1 << 11)	/* MCR-based hw flow control */
44#define UART_CAP_UUE	(1 << 12)	/* UART needs IER bit 6 set (Xscale) */
45#define UART_CAP_RTOIE	(1 << 13)	/* UART needs IER bit 4 set (Xscale, Tegra) */
46
47#define UART_BUG_QUOT	(1 << 0)	/* UART has buggy quot LSB */
48#define UART_BUG_TXEN	(1 << 1)	/* UART has buggy TX IIR status */
49#define UART_BUG_NOMSR	(1 << 2)	/* UART has buggy MSR status bits (Au1x00) */
50#define UART_BUG_THRE	(1 << 3)	/* UART has buggy THRE reassertion */
51
52#define PROBE_RSA	(1 << 0)
53#define PROBE_ANY	(~0)
54
55#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
56
57#ifdef CONFIG_SERIAL_8250_SHARE_IRQ
58#define SERIAL8250_SHARE_IRQS 1
59#else
60#define SERIAL8250_SHARE_IRQS 0
61#endif
62
63#if defined(__alpha__) && !defined(CONFIG_PCI)
64/*
65 * Digital did something really horribly wrong with the OUT1 and OUT2
66 * lines on at least some ALPHA's.  The failure mode is that if either
67 * is cleared, the machine locks up with endless interrupts.
68 */
69#define ALPHA_KLUDGE_MCR  (UART_MCR_OUT2 | UART_MCR_OUT1)
70#elif defined(CONFIG_SBC8560)
71/*
72 * WindRiver did something similarly broken on their SBC8560 board. The
73 * UART tristates its IRQ output while OUT2 is clear, but they pulled
74 * the interrupt line _up_ instead of down, so if we register the IRQ
75 * while the UART is in that state, we die in an IRQ storm. */
76#define ALPHA_KLUDGE_MCR (UART_MCR_OUT2)
77#else
78#define ALPHA_KLUDGE_MCR 0
79#endif