1 files changed, 188 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 00000000000..18340dafa42
--- /dev/null
+++ b/drivers/media/dvb/mantis/mantis_uart.c
@@ -0,0 +1,188 @@
+/*
+        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 <asm/io.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 successfully 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);
+        flush_work_sync(&mantis->uart_work);
+}
+EXPORT_SYMBOL_GPL(mantis_uart_exit);