1/* ASB2305-specific 8250 serial ports
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11#ifndef _ASM_UNIT_SERIAL_H
12#define _ASM_UNIT_SERIAL_H
13
14#include <asm/cpu-regs.h>
15#include <proc/irq.h>
16#include <linux/serial_reg.h>
17
18#define SERIAL_PORT0_BASE_ADDRESS	0xA6FB0000
19#define ASB2305_DEBUG_MCR	__SYSREG(0xA6FB0000 + UART_MCR * 2, u8)
20
21#define SERIAL_IRQ	XIRQ0	/* Dual serial (PC16552)	(Hi) */
22
23/*
24 * The ASB2305 has an 18.432 MHz clock the UART
25 */
26#define BASE_BAUD	(18432000 / 16)
27
28/*
29 * dispose of the /dev/ttyS0 serial port
30 */
31#ifndef CONFIG_GDBSTUB_ON_TTYSx
32
33#define SERIAL_PORT_DFNS						\
34	{								\
35	.baud_base		= BASE_BAUD,				\
36	.irq			= SERIAL_IRQ,				\
37	.flags			= STD_COM_FLAGS,			\
38	.iomem_base		= (u8 *) SERIAL_PORT0_BASE_ADDRESS,	\
39	.iomem_reg_shift	= 2,					\
40	.io_type		= SERIAL_IO_MEM,			\
41	},
42
43#ifndef __ASSEMBLY__
44
45static inline void __debug_to_serial(const char *p, int n)
46{
47}
48
49#endif /* !__ASSEMBLY__ */
50
51#else /* CONFIG_GDBSTUB_ON_TTYSx */
52
53#define SERIAL_PORT_DFNS /* stolen by gdb-stub */
54
55#if defined(CONFIG_GDBSTUB_ON_TTYS0)
56#define GDBPORT_SERIAL_RX	__SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_RX  * 4, u8)
57#define GDBPORT_SERIAL_TX	__SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_TX  * 4, u8)
58#define GDBPORT_SERIAL_DLL	__SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_DLL * 4, u8)
59#define GDBPORT_SERIAL_DLM	__SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_DLM * 4, u8)
60#define GDBPORT_SERIAL_IER	__SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_IER * 4, u8)
61#define GDBPORT_SERIAL_IIR	__SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_IIR * 4, u8)
62#define GDBPORT_SERIAL_FCR	__SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_FCR * 4, u8)
63#define GDBPORT_SERIAL_LCR	__SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_LCR * 4, u8)
64#define GDBPORT_SERIAL_MCR	__SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_MCR * 4, u8)
65#define GDBPORT_SERIAL_LSR	__SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_LSR * 4, u8)
66#define GDBPORT_SERIAL_MSR	__SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_MSR * 4, u8)
67#define GDBPORT_SERIAL_SCR	__SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_SCR * 4, u8)
68#define GDBPORT_SERIAL_IRQ	SERIAL_IRQ
69
70#elif defined(CONFIG_GDBSTUB_ON_TTYS1)
71#error The ASB2305 doesnt have a /dev/ttyS1
72#endif
73
74#ifndef __ASSEMBLY__
75
76#define TTYS0_TX	__SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_TX  * 4, u8)
77#define TTYS0_MCR	__SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_MCR * 4, u8)
78#define TTYS0_LSR	__SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_LSR * 4, u8)
79#define TTYS0_MSR	__SYSREG(SERIAL_PORT0_BASE_ADDRESS + UART_MSR * 4, u8)
80
81#define LSR_WAIT_FOR(STATE)				\
82do {							\
83	while (!(TTYS0_LSR & UART_LSR_##STATE)) {}	\
84} while (0)
85#define FLOWCTL_WAIT_FOR(LINE)				\
86do {							\
87	while (!(TTYS0_MSR & UART_MSR_##LINE)) {}	\
88} while (0)
89#define FLOWCTL_CLEAR(LINE)			\
90do {						\
91	TTYS0_MCR &= ~UART_MCR_##LINE;		\
92} while (0)
93#define FLOWCTL_SET(LINE)			\
94do {						\
95	TTYS0_MCR |= UART_MCR_##LINE;		\
96} while (0)
97#define FLOWCTL_QUERY(LINE)	({ TTYS0_MSR & UART_MSR_##LINE; })
98
99static inline void __debug_to_serial(const char *p, int n)
100{
101	char ch;
102
103	FLOWCTL_SET(DTR);
104
105	for (; n > 0; n--) {
106		LSR_WAIT_FOR(THRE);
107		FLOWCTL_WAIT_FOR(CTS);
108
109		ch = *p++;
110		if (ch == 0x0a) {
111			TTYS0_TX = 0x0d;
112			LSR_WAIT_FOR(THRE);
113			FLOWCTL_WAIT_FOR(CTS);
114		}
115		TTYS0_TX = ch;
116	}
117
118	FLOWCTL_CLEAR(DTR);
119}
120
121#endif /* !__ASSEMBLY__ */
122
123#endif /* CONFIG_GDBSTUB_ON_TTYSx */
124
125#endif /* _ASM_UNIT_SERIAL_H */
126