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path: root/drivers/media/dvb/mantis/mantis_uart.c
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Diffstat (limited to 'drivers/media/dvb/mantis/mantis_uart.c')
-rw-r--r--drivers/media/dvb/mantis/mantis_uart.c186
1 files changed, 186 insertions, 0 deletions
diff --git a/drivers/media/dvb/mantis/mantis_uart.c b/drivers/media/dvb/mantis/mantis_uart.c
new file mode 100644
index 000000000000..7d2f2398fa8b
--- /dev/null
+++ b/drivers/media/dvb/mantis/mantis_uart.c
@@ -0,0 +1,186 @@
+/*
+ Mantis PCI bridge driver
+
+ Copyright (C) Manu Abraham (abraham.manu@gmail.com)
+
+ 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, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+
+#include "dmxdev.h"
+#include "dvbdev.h"
+#include "dvb_demux.h"
+#include "dvb_frontend.h"
+#include "dvb_net.h"
+
+#include "mantis_common.h"
+#include "mantis_reg.h"
+#include "mantis_uart.h"
+
+struct mantis_uart_params {
+ enum mantis_baud baud_rate;
+ enum mantis_parity parity;
+};
+
+static struct {
+ char string[7];
+} rates[5] = {
+ { "9600" },
+ { "19200" },
+ { "38400" },
+ { "57600" },
+ { "115200" }
+};
+
+static struct {
+ char string[5];
+} parity[3] = {
+ { "NONE" },
+ { "ODD" },
+ { "EVEN" }
+};
+
+#define UART_MAX_BUF 16
+
+int mantis_uart_read(struct mantis_pci *mantis, u8 *data)
+{
+ struct mantis_hwconfig *config = mantis->hwconfig;
+ u32 stat = 0, i;
+
+ /* get data */
+ for (i = 0; i < (config->bytes + 1); i++) {
+
+ stat = mmread(MANTIS_UART_STAT);
+
+ if (stat & MANTIS_UART_RXFIFO_FULL) {
+ dprintk(MANTIS_ERROR, 1, "RX Fifo FULL");
+ }
+ data[i] = mmread(MANTIS_UART_RXD) & 0x3f;
+
+ dprintk(MANTIS_DEBUG, 1, "Reading ... <%02x>", data[i] & 0x3f);
+
+ if (data[i] & (1 << 7)) {
+ dprintk(MANTIS_ERROR, 1, "UART framing error");
+ return -EINVAL;
+ }
+ if (data[i] & (1 << 6)) {
+ dprintk(MANTIS_ERROR, 1, "UART parity error");
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static void mantis_uart_work(struct work_struct *work)
+{
+ struct mantis_pci *mantis = container_of(work, struct mantis_pci, uart_work);
+ struct mantis_hwconfig *config = mantis->hwconfig;
+ u8 buf[16];
+ int i;
+
+ mantis_uart_read(mantis, buf);
+
+ for (i = 0; i < (config->bytes + 1); i++)
+ dprintk(MANTIS_INFO, 1, "UART BUF:%d <%02x> ", i, buf[i]);
+
+ dprintk(MANTIS_DEBUG, 0, "\n");
+}
+
+static int mantis_uart_setup(struct mantis_pci *mantis,
+ struct mantis_uart_params *params)
+{
+ u32 reg;
+
+ mmwrite((mmread(MANTIS_UART_CTL) | (params->parity & 0x3)), MANTIS_UART_CTL);
+
+ reg = mmread(MANTIS_UART_BAUD);
+
+ switch (params->baud_rate) {
+ case MANTIS_BAUD_9600:
+ reg |= 0xd8;
+ break;
+ case MANTIS_BAUD_19200:
+ reg |= 0x6c;
+ break;
+ case MANTIS_BAUD_38400:
+ reg |= 0x36;
+ break;
+ case MANTIS_BAUD_57600:
+ reg |= 0x23;
+ break;
+ case MANTIS_BAUD_115200:
+ reg |= 0x11;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ mmwrite(reg, MANTIS_UART_BAUD);
+
+ return 0;
+}
+
+int mantis_uart_init(struct mantis_pci *mantis)
+{
+ struct mantis_hwconfig *config = mantis->hwconfig;
+ struct mantis_uart_params params;
+
+ /* default parity: */
+ params.baud_rate = config->baud_rate;
+ params.parity = config->parity;
+ dprintk(MANTIS_INFO, 1, "Initializing UART @ %sbps parity:%s",
+ rates[params.baud_rate].string,
+ parity[params.parity].string);
+
+ init_waitqueue_head(&mantis->uart_wq);
+ spin_lock_init(&mantis->uart_lock);
+
+ INIT_WORK(&mantis->uart_work, mantis_uart_work);
+
+ /* disable interrupt */
+ mmwrite(mmread(MANTIS_UART_CTL) & 0xffef, MANTIS_UART_CTL);
+
+ mantis_uart_setup(mantis, &params);
+
+ /* default 1 byte */
+ mmwrite((mmread(MANTIS_UART_BAUD) | (config->bytes << 8)), MANTIS_UART_BAUD);
+
+ /* flush buffer */
+ mmwrite((mmread(MANTIS_UART_CTL) | MANTIS_UART_RXFLUSH), MANTIS_UART_CTL);
+
+ /* enable interrupt */
+ mmwrite(mmread(MANTIS_INT_MASK) | 0x800, MANTIS_INT_MASK);
+ mmwrite(mmread(MANTIS_UART_CTL) | MANTIS_UART_RXINT, MANTIS_UART_CTL);
+
+ schedule_work(&mantis->uart_work);
+ dprintk(MANTIS_DEBUG, 1, "UART succesfully initialized");
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mantis_uart_init);
+
+void mantis_uart_exit(struct mantis_pci *mantis)
+{
+ /* disable interrupt */
+ mmwrite(mmread(MANTIS_UART_CTL) & 0xffef, MANTIS_UART_CTL);
+}
+EXPORT_SYMBOL_GPL(mantis_uart_exit);