1/*
2	Mantis PCI bridge driver
3
4	Copyright (C) Manu Abraham (abraham.manu@gmail.com)
5
6	This program is free software; you can redistribute it and/or modify
7	it under the terms of the GNU General Public License as published by
8	the Free Software Foundation; either version 2 of the License, or
9	(at your option) any later version.
10
11	This program is distributed in the hope that it will be useful,
12	but WITHOUT ANY WARRANTY; without even the implied warranty of
13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14	GNU General Public License for more details.
15
16	You should have received a copy of the GNU General Public License
17	along with this program; if not, write to the Free Software
18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19*/
20
21#include <linux/kernel.h>
22#include <linux/spinlock.h>
23#include <asm/io.h>
24
25#include <linux/signal.h>
26#include <linux/sched.h>
27#include <linux/interrupt.h>
28
29#include "dmxdev.h"
30#include "dvbdev.h"
31#include "dvb_demux.h"
32#include "dvb_frontend.h"
33#include "dvb_net.h"
34
35#include "mantis_common.h"
36#include "mantis_reg.h"
37#include "mantis_uart.h"
38
39struct mantis_uart_params {
40	enum mantis_baud	baud_rate;
41	enum mantis_parity	parity;
42};
43
44static struct {
45	char string[7];
46} rates[5] = {
47	{ "9600" },
48	{ "19200" },
49	{ "38400" },
50	{ "57600" },
51	{ "115200" }
52};
53
54static struct {
55	char string[5];
56} parity[3] = {
57	{ "NONE" },
58	{ "ODD" },
59	{ "EVEN" }
60};
61
62#define UART_MAX_BUF			16
63
64static int mantis_uart_read(struct mantis_pci *mantis, u8 *data)
65{
66	struct mantis_hwconfig *config = mantis->hwconfig;
67	u32 stat = 0, i;
68
69	/* get data */
70	for (i = 0; i < (config->bytes + 1); i++) {
71
72		stat = mmread(MANTIS_UART_STAT);
73
74		if (stat & MANTIS_UART_RXFIFO_FULL) {
75			dprintk(MANTIS_ERROR, 1, "RX Fifo FULL");
76		}
77		data[i] = mmread(MANTIS_UART_RXD) & 0x3f;
78
79		dprintk(MANTIS_DEBUG, 1, "Reading ... <%02x>", data[i] & 0x3f);
80
81		if (data[i] & (1 << 7)) {
82			dprintk(MANTIS_ERROR, 1, "UART framing error");
83			return -EINVAL;
84		}
85		if (data[i] & (1 << 6)) {
86			dprintk(MANTIS_ERROR, 1, "UART parity error");
87			return -EINVAL;
88		}
89	}
90
91	return 0;
92}
93
94static void mantis_uart_work(struct work_struct *work)
95{
96	struct mantis_pci *mantis = container_of(work, struct mantis_pci, uart_work);
97	struct mantis_hwconfig *config = mantis->hwconfig;
98	u8 buf[16];
99	int i;
100
101	mantis_uart_read(mantis, buf);
102
103	for (i = 0; i < (config->bytes + 1); i++)
104		dprintk(MANTIS_INFO, 1, "UART BUF:%d <%02x> ", i, buf[i]);
105
106	dprintk(MANTIS_DEBUG, 0, "\n");
107}
108
109static int mantis_uart_setup(struct mantis_pci *mantis,
110			     struct mantis_uart_params *params)
111{
112	u32 reg;
113
114	mmwrite((mmread(MANTIS_UART_CTL) | (params->parity & 0x3)), MANTIS_UART_CTL);
115
116	reg = mmread(MANTIS_UART_BAUD);
117
118	switch (params->baud_rate) {
119	case MANTIS_BAUD_9600:
120		reg |= 0xd8;
121		break;
122	case MANTIS_BAUD_19200:
123		reg |= 0x6c;
124		break;
125	case MANTIS_BAUD_38400:
126		reg |= 0x36;
127		break;
128	case MANTIS_BAUD_57600:
129		reg |= 0x23;
130		break;
131	case MANTIS_BAUD_115200:
132		reg |= 0x11;
133		break;
134	default:
135		return -EINVAL;
136	}
137
138	mmwrite(reg, MANTIS_UART_BAUD);
139
140	return 0;
141}
142
143int mantis_uart_init(struct mantis_pci *mantis)
144{
145	struct mantis_hwconfig *config = mantis->hwconfig;
146	struct mantis_uart_params params;
147
148	/* default parity: */
149	params.baud_rate = config->baud_rate;
150	params.parity = config->parity;
151	dprintk(MANTIS_INFO, 1, "Initializing UART @ %sbps parity:%s",
152		rates[params.baud_rate].string,
153		parity[params.parity].string);
154
155	init_waitqueue_head(&mantis->uart_wq);
156	spin_lock_init(&mantis->uart_lock);
157
158	INIT_WORK(&mantis->uart_work, mantis_uart_work);
159
160	/* disable interrupt */
161	mmwrite(mmread(MANTIS_UART_CTL) & 0xffef, MANTIS_UART_CTL);
162
163	mantis_uart_setup(mantis, &params);
164
165	/* default 1 byte */
166	mmwrite((mmread(MANTIS_UART_BAUD) | (config->bytes << 8)), MANTIS_UART_BAUD);
167
168	/* flush buffer */
169	mmwrite((mmread(MANTIS_UART_CTL) | MANTIS_UART_RXFLUSH), MANTIS_UART_CTL);
170
171	/* enable interrupt */
172	mmwrite(mmread(MANTIS_INT_MASK) | 0x800, MANTIS_INT_MASK);
173	mmwrite(mmread(MANTIS_UART_CTL) | MANTIS_UART_RXINT, MANTIS_UART_CTL);
174
175	schedule_work(&mantis->uart_work);
176	dprintk(MANTIS_DEBUG, 1, "UART successfully initialized");
177
178	return 0;
179}
180EXPORT_SYMBOL_GPL(mantis_uart_init);
181
182void mantis_uart_exit(struct mantis_pci *mantis)
183{
184	/* disable interrupt */
185	mmwrite(mmread(MANTIS_UART_CTL) & 0xffef, MANTIS_UART_CTL);
186	flush_work(&mantis->uart_work);
187}
188EXPORT_SYMBOL_GPL(mantis_uart_exit);
189