1/*
2 * Copyright (c) 2008 Travis Geiselbrecht
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files
6 * (the "Software"), to deal in the Software without restriction,
7 * including without limitation the rights to use, copy, modify, merge,
8 * publish, distribute, sublicense, and/or sell copies of the Software,
9 * and to permit persons to whom the Software is furnished to do so,
10 * subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 */
23
24
25#include <arch/generic/debug_uart_8250.h>
26#include <debug.h>
27#include <new>
28
29
30DebugUART8250::DebugUART8250(addr_t base, int64 clock)
31	:
32	DebugUART(base, clock)
33{
34}
35
36
37DebugUART8250::~DebugUART8250()
38{
39}
40
41
42#define UART_RHR    0
43#define UART_THR    0
44#define UART_DLL    0
45#define UART_IER    1
46#define UART_DLH    1
47#define UART_IIR    2
48#define UART_FCR    2
49#define UART_EFR    2
50#define UART_LCR    3
51#define UART_MCR    4
52#define UART_LSR    5
53#define UART_MSR    6
54#define UART_TCR    6
55#define UART_SPR    7
56#define UART_TLR    7
57
58#define LCR_8N1		0x03
59
60#define FCR_FIFO_EN	0x01	/* Fifo enable */
61#define FCR_RXSR	0x02	/* Receiver soft reset */
62#define FCR_TXSR	0x04	/* Transmitter soft reset */
63
64#define MCR_DTR		0x01
65#define MCR_RTS		0x02
66#define MCR_DMA_EN	0x04
67#define MCR_TX_DFR	0x08
68
69#define LCR_WLS_MSK	0x03	/* character length select mask */
70#define LCR_WLS_5	0x00	/* 5 bit character length */
71#define LCR_WLS_6	0x01	/* 6 bit character length */
72#define LCR_WLS_7	0x02	/* 7 bit character length */
73#define LCR_WLS_8	0x03	/* 8 bit character length */
74#define LCR_STB		0x04	/* Number of stop Bits, off = 1, on = 1.5 or 2) */
75#define LCR_PEN		0x08	/* Parity eneble */
76#define LCR_EPS		0x10	/* Even Parity Select */
77#define LCR_STKP	0x20	/* Stick Parity */
78#define LCR_SBRK	0x40	/* Set Break */
79#define LCR_BKSE	0x80	/* Bank select enable */
80
81#define LSR_DR		0x01	/* Data ready */
82#define LSR_OE		0x02	/* Overrun */
83#define LSR_PE		0x04	/* Parity error */
84#define LSR_FE		0x08	/* Framing error */
85#define LSR_BI		0x10	/* Break */
86#define LSR_THRE	0x20	/* Xmit holding register empty */
87#define LSR_TEMT	0x40	/* Xmitter empty */
88#define LSR_ERR		0x80	/* Error */
89
90
91void
92DebugUART8250::InitPort(uint32 baud)
93{
94	Disable();
95
96	uint16 baudDivisor = Clock() / (16 * baud);
97
98	// Write standard uart settings
99	Out8(UART_LCR, LCR_8N1);
100	// 8N1
101	Out8(UART_IER, 0);
102	// Disable interrupt
103	Out8(UART_FCR, 0);
104	// Disable FIFO
105	Out8(UART_MCR, MCR_DTR | MCR_RTS);
106	// DTR / RTS
107
108	// Gain access to, and program baud divisor
109	unsigned char buffer = In8(UART_LCR);
110	Out8(UART_LCR, buffer | LCR_BKSE);
111	Out8(UART_DLL, baudDivisor & 0xff);
112	Out8(UART_DLH, (baudDivisor >> 8) & 0xff);
113	Out8(UART_LCR, buffer & ~LCR_BKSE);
114
115//	Out8(UART_MDR1, 0); // UART 16x mode
116//	Out8(UART_LCR, 0xBF); // config mode B
117//	Out8(UART_EFR, (1<<7)|(1<<6)); // hw flow control
118//	Out8(UART_LCR, LCR_8N1); // operational mode
119
120	Enable();
121}
122
123
124void
125DebugUART8250::InitEarly()
126{
127}
128
129
130void
131DebugUART8250::Init()
132{
133}
134
135
136int
137DebugUART8250::PutChar(char c)
138{
139	while (!(In8(UART_LSR) & (1<<6)));
140		// wait for the last char to get out
141	Out8(UART_THR, c);
142	return 0;
143}
144
145
146/* returns -1 if no data available */
147int
148DebugUART8250::GetChar(bool wait)
149{
150	if (wait) {
151		while (!(In8(UART_LSR) & (1<<0)));
152			// wait for data to show up in the rx fifo
153	} else {
154		if (!(In8(UART_LSR) & (1<<0)))
155			return -1;
156	}
157	return In8(UART_RHR);
158}
159
160
161void
162DebugUART8250::FlushTx()
163{
164	while (!(In8(UART_LSR) & (1<<6)));
165		// wait for the last char to get out
166}
167
168
169void
170DebugUART8250::FlushRx()
171{
172	// empty the rx fifo
173	while (In8(UART_LSR) & (1<<0)) {
174		volatile char c = In8(UART_RHR);
175		(void)c;
176	}
177}
178
179
180DebugUART8250*
181arch_get_uart_8250(addr_t base, int64 clock)
182{
183	static char buffer[sizeof(DebugUART8250)];
184	DebugUART8250* uart = new(buffer) DebugUART8250(base, clock);
185	return uart;
186}
187
188