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 #include <linux/pci.h>
29
30 #include "dmxdev.h"
31 #include "dvbdev.h"
32 #include "dvb_demux.h"
33 #include "dvb_frontend.h"
34 #include "dvb_net.h"
35
36 #include "mantis_common.h"
37 #include "mantis_reg.h"
38 #include "mantis_uart.h"
39 #include "mantis_input.h"
40
41 struct mantis_uart_params {
42 enum mantis_baud baud_rate;
43 enum mantis_parity parity;
44 };
45
46 static struct {
47 char string[7];
48 } rates[5] = {
49 { "9600" },
50 { "19200" },
51 { "38400" },
52 { "57600" },
53 { "115200" }
54 };
55
56 static struct {
57 char string[5];
58 } parity[3] = {
59 { "NONE" },
60 { "ODD" },
61 { "EVEN" }
62 };
63
mantis_uart_read(struct mantis_pci * mantis)64 static void mantis_uart_read(struct mantis_pci *mantis)
65 {
66 struct mantis_hwconfig *config = mantis->hwconfig;
67 int i, scancode = 0, err = 0;
68
69 /* get data */
70 dprintk(MANTIS_DEBUG, 1, "UART Reading ...");
71 for (i = 0; i < (config->bytes + 1); i++) {
72 int data = mmread(MANTIS_UART_RXD);
73
74 dprintk(MANTIS_DEBUG, 0, " <%02x>", data);
75
76 scancode = (scancode << 8) | (data & 0x3f);
77 err |= data;
78
79 if (data & (1 << 7))
80 dprintk(MANTIS_ERROR, 1, "UART framing error");
81
82 if (data & (1 << 6))
83 dprintk(MANTIS_ERROR, 1, "UART parity error");
84 }
85 dprintk(MANTIS_DEBUG, 0, "\n");
86
87 if ((err & 0xC0) == 0)
88 mantis_input_process(mantis, scancode);
89 }
90
mantis_uart_work(struct work_struct * work)91 static void mantis_uart_work(struct work_struct *work)
92 {
93 struct mantis_pci *mantis = container_of(work, struct mantis_pci, uart_work);
94 u32 stat;
95
96 stat = mmread(MANTIS_UART_STAT);
97
98 if (stat & MANTIS_UART_RXFIFO_FULL)
99 dprintk(MANTIS_ERROR, 1, "RX Fifo FULL");
100
101 /*
102 * MANTIS_UART_RXFIFO_DATA is only set if at least
103 * config->bytes + 1 bytes are in the FIFO.
104 */
105 while (stat & MANTIS_UART_RXFIFO_DATA) {
106 mantis_uart_read(mantis);
107 stat = mmread(MANTIS_UART_STAT);
108 }
109
110 /* re-enable UART (RX) interrupt */
111 mantis_unmask_ints(mantis, MANTIS_INT_IRQ1);
112 }
113
mantis_uart_setup(struct mantis_pci * mantis,struct mantis_uart_params * params)114 static int mantis_uart_setup(struct mantis_pci *mantis,
115 struct mantis_uart_params *params)
116 {
117 u32 reg;
118
119 mmwrite((mmread(MANTIS_UART_CTL) | (params->parity & 0x3)), MANTIS_UART_CTL);
120
121 reg = mmread(MANTIS_UART_BAUD);
122
123 switch (params->baud_rate) {
124 case MANTIS_BAUD_9600:
125 reg |= 0xd8;
126 break;
127 case MANTIS_BAUD_19200:
128 reg |= 0x6c;
129 break;
130 case MANTIS_BAUD_38400:
131 reg |= 0x36;
132 break;
133 case MANTIS_BAUD_57600:
134 reg |= 0x23;
135 break;
136 case MANTIS_BAUD_115200:
137 reg |= 0x11;
138 break;
139 default:
140 return -EINVAL;
141 }
142
143 mmwrite(reg, MANTIS_UART_BAUD);
144
145 return 0;
146 }
147
mantis_uart_init(struct mantis_pci * mantis)148 int mantis_uart_init(struct mantis_pci *mantis)
149 {
150 struct mantis_hwconfig *config = mantis->hwconfig;
151 struct mantis_uart_params params;
152
153 /* default parity: */
154 params.baud_rate = config->baud_rate;
155 params.parity = config->parity;
156 dprintk(MANTIS_INFO, 1, "Initializing UART @ %sbps parity:%s",
157 rates[params.baud_rate].string,
158 parity[params.parity].string);
159
160 INIT_WORK(&mantis->uart_work, mantis_uart_work);
161
162 /* disable interrupt */
163 mmwrite(mmread(MANTIS_UART_CTL) & 0xffef, MANTIS_UART_CTL);
164
165 mantis_uart_setup(mantis, ¶ms);
166
167 /* default 1 byte */
168 mmwrite((mmread(MANTIS_UART_BAUD) | (config->bytes << 8)), MANTIS_UART_BAUD);
169
170 /* flush buffer */
171 mmwrite((mmread(MANTIS_UART_CTL) | MANTIS_UART_RXFLUSH), MANTIS_UART_CTL);
172
173 /* enable interrupt */
174 mmwrite(mmread(MANTIS_UART_CTL) | MANTIS_UART_RXINT, MANTIS_UART_CTL);
175 mantis_unmask_ints(mantis, MANTIS_INT_IRQ1);
176
177 schedule_work(&mantis->uart_work);
178 dprintk(MANTIS_DEBUG, 1, "UART successfully initialized");
179
180 return 0;
181 }
182 EXPORT_SYMBOL_GPL(mantis_uart_init);
183
mantis_uart_exit(struct mantis_pci * mantis)184 void mantis_uart_exit(struct mantis_pci *mantis)
185 {
186 /* disable interrupt */
187 mantis_mask_ints(mantis, MANTIS_INT_IRQ1);
188 mmwrite(mmread(MANTIS_UART_CTL) & 0xffef, MANTIS_UART_CTL);
189 flush_work(&mantis->uart_work);
190 }
191 EXPORT_SYMBOL_GPL(mantis_uart_exit);
192