Linux 4.19-rc7
[linux-2.6/btrfs-unstable.git] / drivers / media / pci / mantis / mantis_uart.c
blobb7765687e0c30310db5b125bcfdf21b12de53758
1 /*
2 Mantis PCI bridge driver
4 Copyright (C) Manu Abraham (abraham.manu@gmail.com)
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.
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.
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.
21 #include <linux/kernel.h>
22 #include <linux/spinlock.h>
23 #include <asm/io.h>
25 #include <linux/signal.h>
26 #include <linux/sched.h>
27 #include <linux/interrupt.h>
28 #include <linux/pci.h>
30 #include <media/dmxdev.h>
31 #include <media/dvbdev.h>
32 #include <media/dvb_demux.h>
33 #include <media/dvb_frontend.h>
34 #include <media/dvb_net.h>
36 #include "mantis_common.h"
37 #include "mantis_reg.h"
38 #include "mantis_uart.h"
39 #include "mantis_input.h"
41 struct mantis_uart_params {
42 enum mantis_baud baud_rate;
43 enum mantis_parity parity;
46 static struct {
47 char string[7];
48 } rates[5] = {
49 { "9600" },
50 { "19200" },
51 { "38400" },
52 { "57600" },
53 { "115200" }
56 static struct {
57 char string[5];
58 } parity[3] = {
59 { "NONE" },
60 { "ODD" },
61 { "EVEN" }
64 static void mantis_uart_read(struct mantis_pci *mantis)
66 struct mantis_hwconfig *config = mantis->hwconfig;
67 int i, scancode = 0, err = 0;
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);
74 dprintk(MANTIS_DEBUG, 0, " <%02x>", data);
76 scancode = (scancode << 8) | (data & 0x3f);
77 err |= data;
79 if (data & (1 << 7))
80 dprintk(MANTIS_ERROR, 1, "UART framing error");
82 if (data & (1 << 6))
83 dprintk(MANTIS_ERROR, 1, "UART parity error");
85 dprintk(MANTIS_DEBUG, 0, "\n");
87 if ((err & 0xC0) == 0)
88 mantis_input_process(mantis, scancode);
91 static void mantis_uart_work(struct work_struct *work)
93 struct mantis_pci *mantis = container_of(work, struct mantis_pci, uart_work);
94 u32 stat;
95 unsigned long timeout;
97 stat = mmread(MANTIS_UART_STAT);
99 if (stat & MANTIS_UART_RXFIFO_FULL)
100 dprintk(MANTIS_ERROR, 1, "RX Fifo FULL");
103 * MANTIS_UART_RXFIFO_DATA is only set if at least
104 * config->bytes + 1 bytes are in the FIFO.
107 /* FIXME: is 10ms good enough ? */
108 timeout = jiffies + msecs_to_jiffies(10);
109 while (stat & MANTIS_UART_RXFIFO_DATA) {
110 mantis_uart_read(mantis);
111 stat = mmread(MANTIS_UART_STAT);
113 if (!time_is_after_jiffies(timeout))
114 break;
117 /* re-enable UART (RX) interrupt */
118 mantis_unmask_ints(mantis, MANTIS_INT_IRQ1);
121 static int mantis_uart_setup(struct mantis_pci *mantis,
122 struct mantis_uart_params *params)
124 u32 reg;
126 mmwrite((mmread(MANTIS_UART_CTL) | (params->parity & 0x3)), MANTIS_UART_CTL);
128 reg = mmread(MANTIS_UART_BAUD);
130 switch (params->baud_rate) {
131 case MANTIS_BAUD_9600:
132 reg |= 0xd8;
133 break;
134 case MANTIS_BAUD_19200:
135 reg |= 0x6c;
136 break;
137 case MANTIS_BAUD_38400:
138 reg |= 0x36;
139 break;
140 case MANTIS_BAUD_57600:
141 reg |= 0x23;
142 break;
143 case MANTIS_BAUD_115200:
144 reg |= 0x11;
145 break;
146 default:
147 return -EINVAL;
150 mmwrite(reg, MANTIS_UART_BAUD);
152 return 0;
155 int mantis_uart_init(struct mantis_pci *mantis)
157 struct mantis_hwconfig *config = mantis->hwconfig;
158 struct mantis_uart_params params;
160 /* default parity: */
161 params.baud_rate = config->baud_rate;
162 params.parity = config->parity;
163 dprintk(MANTIS_INFO, 1, "Initializing UART @ %sbps parity:%s",
164 rates[params.baud_rate].string,
165 parity[params.parity].string);
167 INIT_WORK(&mantis->uart_work, mantis_uart_work);
169 /* disable interrupt */
170 mmwrite(mmread(MANTIS_UART_CTL) & 0xffef, MANTIS_UART_CTL);
172 mantis_uart_setup(mantis, &params);
174 /* default 1 byte */
175 mmwrite((mmread(MANTIS_UART_BAUD) | (config->bytes << 8)), MANTIS_UART_BAUD);
177 /* flush buffer */
178 mmwrite((mmread(MANTIS_UART_CTL) | MANTIS_UART_RXFLUSH), MANTIS_UART_CTL);
180 /* enable interrupt */
181 mmwrite(mmread(MANTIS_UART_CTL) | MANTIS_UART_RXINT, MANTIS_UART_CTL);
182 mantis_unmask_ints(mantis, MANTIS_INT_IRQ1);
184 schedule_work(&mantis->uart_work);
185 dprintk(MANTIS_DEBUG, 1, "UART successfully initialized");
187 return 0;
189 EXPORT_SYMBOL_GPL(mantis_uart_init);
191 void mantis_uart_exit(struct mantis_pci *mantis)
193 /* disable interrupt */
194 mantis_mask_ints(mantis, MANTIS_INT_IRQ1);
195 mmwrite(mmread(MANTIS_UART_CTL) & 0xffef, MANTIS_UART_CTL);
196 flush_work(&mantis->uart_work);
198 EXPORT_SYMBOL_GPL(mantis_uart_exit);