summaryrefslogtreecommitdiffstats
path: root/drivers/tty/serial/8250/8250_fintek.c
blob: 1bb28cb69493af36dc394ace3d0122c7a1bc930c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
/*
 *  Probe for F81216A LPC to 4 UART
 *
 *  Based on drivers/tty/serial/8250_pnp.c, by Russell King, et al
 *
 *  Copyright (C) 2014 Ricardo Ribalda, Qtechnology A/S
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License.
 */
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/pnp.h>
#include <linux/kernel.h>
#include <linux/serial_core.h>
#include  "8250.h"

#define ADDR_PORT 0x4E
#define DATA_PORT 0x4F
#define ENTRY_KEY 0x77
#define EXIT_KEY 0xAA
#define CHIP_ID1  0x20
#define CHIP_ID1_VAL 0x02
#define CHIP_ID2  0x21
#define CHIP_ID2_VAL 0x16
#define VENDOR_ID1 0x23
#define VENDOR_ID1_VAL 0x19
#define VENDOR_ID2 0x24
#define VENDOR_ID2_VAL 0x34
#define LDN 0x7

#define RS485  0xF0
#define RTS_INVERT BIT(5)
#define RS485_URA BIT(4)
#define RXW4C_IRA BIT(3)
#define TXW4C_IRA BIT(2)

#define DRIVER_NAME "8250_fintek"

static int fintek_8250_enter_key(void){

	if (!request_muxed_region(ADDR_PORT, 2, DRIVER_NAME))
		return -EBUSY;

	outb(ENTRY_KEY, ADDR_PORT);
	outb(ENTRY_KEY, ADDR_PORT);
	return 0;
}

static void fintek_8250_exit_key(void){

	outb(EXIT_KEY, ADDR_PORT);
	release_region(ADDR_PORT, 2);
}

static int fintek_8250_get_index(resource_size_t base_addr)
{
	resource_size_t base[] = {0x3f8, 0x2f8, 0x3e8, 0x2e8};
	int i;

	for (i = 0; i < ARRAY_SIZE(base); i++)
		if (base_addr == base[i])
			return i;

	return -ENODEV;
}

static int fintek_8250_check_id(void)
{

	outb(CHIP_ID1, ADDR_PORT);
	if (inb(DATA_PORT) != CHIP_ID1_VAL)
		return -ENODEV;

	outb(CHIP_ID2, ADDR_PORT);
	if (inb(DATA_PORT) != CHIP_ID2_VAL)
		return -ENODEV;

	outb(VENDOR_ID1, ADDR_PORT);
	if (inb(DATA_PORT) != VENDOR_ID1_VAL)
		return -ENODEV;

	outb(VENDOR_ID2, ADDR_PORT);
	if (inb(DATA_PORT) != VENDOR_ID2_VAL)
		return -ENODEV;

	return 0;
}

static int fintek_8250_rs4850_config(struct uart_8250_port *uart,
			      struct serial_rs485 *rs485)
{
	uint8_t config = 0;
	int index = fintek_8250_get_index(uart->port.iobase);

	if (index < 0)
		return -EINVAL;

	if (rs485->flags & SER_RS485_ENABLED)
		memset(rs485->padding, 0, sizeof(rs485->padding));
	else
		memset(rs485, 0, sizeof(*rs485));

	rs485->flags &= SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND |
			SER_RS485_RTS_AFTER_SEND;

	if (rs485->delay_rts_before_send) {
		rs485->delay_rts_before_send = 1;
		config |= TXW4C_IRA;
	}

	if (rs485->delay_rts_after_send) {
		rs485->delay_rts_after_send = 1;
		config |= RXW4C_IRA;
	}

	if ((!!(rs485->flags & SER_RS485_RTS_ON_SEND)) ==
			(!!(rs485->flags & SER_RS485_RTS_AFTER_SEND)))
		rs485->flags &= SER_RS485_ENABLED;
	else
		config |= RS485_URA;

	if (rs485->flags & SER_RS485_RTS_ON_SEND)
		config |= RTS_INVERT;

	if (fintek_8250_enter_key())
		return -EBUSY;

	outb(LDN, ADDR_PORT);
	outb(index, DATA_PORT);
	outb(RS485, ADDR_PORT);
	outb(config, DATA_PORT);
	fintek_8250_exit_key();

	return 0;
}

static int
fintek_8250_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
{
	int line;
	struct uart_8250_port uart;
	int ret;

	if (!pnp_port_valid(dev, 0))
		return -ENODEV;

	if (fintek_8250_get_index(pnp_port_start(dev, 0)) < 0)
		return -ENODEV;

	/* Enable configuration registers*/
	if (fintek_8250_enter_key())
		return -EBUSY;

	/*Check ID*/
	ret = fintek_8250_check_id();
	fintek_8250_exit_key();
	if (ret)
		return ret;

	memset(&uart, 0, sizeof(uart));
	if (!pnp_irq_valid(dev, 0))
		return -ENODEV;
	uart.port.irq = pnp_irq(dev, 0);
	uart.port.iobase = pnp_port_start(dev, 0);
	uart.port.iotype = UPIO_PORT;
	uart.rs485_config = fintek_8250_rs4850_config;

	uart.port.flags |= UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
	if (pnp_irq_flags(dev, 0) & IORESOURCE_IRQ_SHAREABLE)
		uart.port.flags |= UPF_SHARE_IRQ;
	uart.port.uartclk = 1843200;
	uart.port.dev = &dev->dev;

	line = serial8250_register_8250_port(&uart);
	if (line < 0)
		return -ENODEV;

	pnp_set_drvdata(dev, (void *)((long)line + 1));
	return 0;
}

static void fintek_8250_remove(struct pnp_dev *dev)
{
	long line = (long)pnp_get_drvdata(dev);

	if (line)
		serial8250_unregister_port(line - 1);
}

#ifdef CONFIG_PM
static int fintek_8250_suspend(struct pnp_dev *dev, pm_message_t state)
{
	long line = (long)pnp_get_drvdata(dev);

	if (!line)
		return -ENODEV;
	serial8250_suspend_port(line - 1);
	return 0;
}

static int fintek_8250_resume(struct pnp_dev *dev)
{
	long line = (long)pnp_get_drvdata(dev);

	if (!line)
		return -ENODEV;
	serial8250_resume_port(line - 1);
	return 0;
}
#else
#define fintek_8250_suspend NULL
#define fintek_8250_resume NULL
#endif /* CONFIG_PM */

static const struct pnp_device_id fintek_dev_table[] = {
	/* Qtechnology Panel PC / IO1000 */
	{ "PNP0501"},
	{}
};

MODULE_DEVICE_TABLE(pnp, fintek_dev_table);

static struct pnp_driver fintek_8250_driver = {
	.name		= DRIVER_NAME,
	.probe		= fintek_8250_probe,
	.remove		= fintek_8250_remove,
	.suspend	= fintek_8250_suspend,
	.resume		= fintek_8250_resume,
	.id_table	= fintek_dev_table,
};

static int fintek_8250_init(void)
{
	return pnp_register_driver(&fintek_8250_driver);
}
module_init(fintek_8250_init);

static void fintek_8250_exit(void)
{
	pnp_unregister_driver(&fintek_8250_driver);
}
module_exit(fintek_8250_exit);

MODULE_DESCRIPTION("Fintek F812164 module");
MODULE_AUTHOR("Ricardo Ribalda <ricardo.ribalda@gmail.com>");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud