summaryrefslogtreecommitdiffstats
path: root/drivers/net/irda/irport.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/net/irda/irport.c')
-rw-r--r--drivers/net/irda/irport.c403
1 files changed, 403 insertions, 0 deletions
diff --git a/drivers/net/irda/irport.c b/drivers/net/irda/irport.c
new file mode 100644
index 000000000..ae8bcb27b
--- /dev/null
+++ b/drivers/net/irda/irport.c
@@ -0,0 +1,403 @@
+/*********************************************************************
+ *
+ * Filename: irport.c
+ * Version: 0.8
+ * Description: Serial driver for IrDA.
+ * Status: Experimental.
+ * Author: Dag Brattli <dagb@cs.uit.no>
+ * Created at: Sun Aug 3 13:49:59 1997
+ * Modified at: Sat May 23 23:15:20 1998
+ * Modified by: Dag Brattli <dagb@cs.uit.no>
+ * Sources: serial.c by Linus Torvalds
+ * serial_serial.c by Aage Kvalnes <aage@cs.uit.no>
+ *
+ * Copyright (c) 1997,1998 Dag Brattli <dagb@cs.uit.no>
+ * All Rights Reserved.
+ *
+ * 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.
+ *
+ * Neither Dag Brattli nor University of Tromsų admit liability nor
+ * provide warranty for any of this software. This material is
+ * provided "AS-IS" and at no charge.
+ *
+ * NOTICE:
+ *
+ * This driver is ment to be a small serial driver to be used for
+ * IR-chipsets that has a UART (16550) compatibility mode. If your
+ * chipset is is UART only, you should probably use IrTTY instead since
+ * the Linux serial driver is probably more robust and optimized.
+ *
+ * The functions in this file may be used by FIR drivers, but this
+ * driver knows nothing about FIR drivers so don't ever insert such
+ * code into this file. Instead you should code your FIR driver in a
+ * separate file, and then call the functions in this file if
+ * necessary. This is becase it is difficult to use the Linux serial
+ * driver with a FIR driver becase they must share interrupts etc. Most
+ * FIR chipsets can function in advanced SIR mode, and you should
+ * probably use that mode instead of the UART compatibility mode (and
+ * then just forget about this file)
+ *
+ ********************************************************************/
+
+#include <linux/module.h>
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/ioport.h>
+#include <linux/malloc.h>
+#include <linux/string.h>
+#include <asm/system.h>
+#include <asm/bitops.h>
+#include <asm/io.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+
+#include <linux/skbuff.h>
+#include <linux/serial_reg.h>
+
+#include <net/irda/irda.h>
+#include <net/irda/irmod.h>
+#include <net/irda/wrapper.h>
+#include <net/irda/irport.h>
+
+#define IO_EXTENT 8
+
+static unsigned int io[] = { 0x3e8, ~0, ~0, ~0 };
+static unsigned int irq[] = { 11, 0, 0, 0 };
+
+static void irport_write_wakeup( struct irda_device *idev);
+static int irport_write( int iobase, int fifo_size, __u8 *buf, int len);
+static void irport_receive( struct irda_device *idev);
+
+__initfunc(int irport_init(void))
+{
+/* int i; */
+
+/* for ( i=0; (io[i] < 2000) && (i < 4); i++) { */
+/* int ioaddr = io[i]; */
+/* if (check_region(ioaddr, IO_EXTENT)) */
+/* continue; */
+/* if (irport_open( i, io[i], io2[i], irq[i], dma[i]) == 0) */
+/* return 0; */
+/* } */
+/* return -ENODEV; */
+ return 0;
+}
+
+/*
+ * Function pc87108_cleanup ()
+ *
+ * Close all configured chips
+ *
+ */
+#ifdef MODULE
+static void irport_cleanup(void)
+{
+ int i;
+
+ DEBUG( 4, __FUNCTION__ "()\n");
+
+ /* for ( i=0; i < 4; i++) { */
+/* if ( dev_self[i]) */
+/* irport_close( &(dev_self[i]->idev)); */
+/* } */
+}
+#endif /* MODULE */
+
+/*
+ * Function irport_open (void)
+ *
+ * Start IO port
+ *
+ */
+int irport_open( int iobase)
+{
+ DEBUG( 0, __FUNCTION__ "(), iobase=%#x\n", iobase);
+
+ /* Initialize UART */
+ outb( UART_LCR_WLEN8, iobase+UART_LCR); /* Reset DLAB */
+ outb(( UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase+UART_MCR);
+
+ /* Turn on interrups */
+ outb(( UART_IER_THRI |UART_IER_RLSI | UART_IER_RDI), iobase+UART_IER);
+
+ return 0;
+}
+
+/*
+ * Function irport_cleanup ()
+ *
+ * Stop IO port
+ *
+ */
+void irport_close( int iobase)
+{
+ DEBUG( 0, __FUNCTION__ "()\n");
+
+ /* Reset UART */
+ outb( 0, iobase+UART_MCR);
+
+ /* Turn off interrupts */
+ outb( 0, iobase+UART_IER);
+}
+
+/*
+ * Function irport_change_speed (idev, speed)
+ *
+ * Set speed of port to specified baudrate
+ *
+ */
+void irport_change_speed( int iobase, int speed)
+{
+ int fcr; /* FIFO control reg */
+ int lcr; /* Line control reg */
+ int divisor;
+
+ DEBUG( 0, __FUNCTION__ "(), Setting speed to: %d\n", speed);
+
+ DEBUG( 0, __FUNCTION__ "(), iobase=%#x\n", iobase);
+
+ /* Turn off interrupts */
+ outb( 0, iobase+UART_IER);
+
+ divisor = SPEED_MAX/speed;
+
+ fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_14;
+
+ /* IrDA ports use 8N1 */
+ lcr = UART_LCR_WLEN8;
+
+ outb( UART_LCR_DLAB | lcr, iobase+UART_LCR); /* Set DLAB */
+ outb( divisor & 0xff, iobase+UART_DLL); /* Set speed */
+ outb( divisor >> 8, iobase+UART_DLM);
+ outb( lcr, iobase+UART_LCR); /* Set 8N1 */
+ outb( fcr, iobase+UART_FCR); /* Enable FIFO's */
+
+ /* Turn on interrups */
+ outb( UART_IER_THRI|UART_IER_RLSI|UART_IER_RDI, iobase+UART_IER);
+}
+
+/*
+ * Function irport_interrupt (irq, dev_id, regs)
+ *
+ *
+ */
+void irport_interrupt( int irq, void *dev_id, struct pt_regs *regs)
+{
+ struct irda_device *idev = (struct irda_device *) dev_id;
+
+ int iobase, status;
+ int iir;
+
+ DEBUG( 4, __FUNCTION__ "(), irq %d\n", irq);
+
+ if ( !idev) {
+ printk( KERN_WARNING __FUNCTION__
+ "() irq %d for unknown device.\n", irq);
+ return;
+ }
+
+ idev->netdev.interrupt = 1;
+
+ iobase = idev->io.iobase2;
+
+ iir = inb(iobase + UART_IIR);
+ do {
+ status = inb( iobase+UART_LSR);
+
+ if (status & UART_LSR_DR) {
+ /* Receive interrupt */
+ irport_receive(idev);
+ }
+ if (status & UART_LSR_THRE) {
+ /* Transmitter ready for data */
+ irport_write_wakeup(idev);
+ }
+ } while (!(inb(iobase+UART_IIR) & UART_IIR_NO_INT));
+
+ idev->netdev.interrupt = 0;
+}
+
+/*
+ * Function irport_write_wakeup (tty)
+ *
+ * Called by the driver when there's room for more data. If we have
+ * more packets to send, we send them here.
+ *
+ */
+static void irport_write_wakeup( struct irda_device *idev)
+{
+ int actual = 0, count;
+
+ DEBUG( 4, __FUNCTION__ "() <%ld>\n", jiffies);
+
+ ASSERT( idev != NULL, return;);
+ ASSERT( idev->magic == IRDA_DEVICE_MAGIC, return;);
+
+ /* Finished with frame? */
+ if ( idev->tx_buff.offset == idev->tx_buff.len) {
+
+ /*
+ * Now serial buffer is almost free & we can start
+ * transmission of another packet
+ */
+ DEBUG( 4, __FUNCTION__ "(), finished with frame!\n");
+
+ idev->netdev.tbusy = 0; /* Unlock */
+ idev->stats.tx_packets++;
+
+ /* Schedule network layer, so we can get some more frames */
+ mark_bh( NET_BH);
+
+ return;
+ }
+
+ /* Write data left in transmit buffer */
+ count = idev->tx_buff.len - idev->tx_buff.offset;
+ actual = irport_write( idev->io.iobase2, idev->io.fifo_size,
+ idev->tx_buff.head, count);
+ idev->tx_buff.offset += actual;
+ idev->tx_buff.head += actual;
+}
+
+/*
+ * Function irport_write (driver)
+ *
+ *
+ *
+ */
+static int irport_write( int iobase, int fifo_size, __u8 *buf, int len)
+{
+ int actual = 0;
+
+ /* Tx FIFO should be empty! */
+ if (!(inb( iobase+UART_LSR) & UART_LSR_THRE)) {
+ DEBUG( 0, __FUNCTION__ "(), failed, fifo not empty!\n");
+ return -1;
+ }
+
+ /* Fill FIFO with current frame */
+ while (( fifo_size-- > 0) && (actual < len)) {
+ /* Transmit next byte */
+ outb( buf[actual], iobase+UART_TX);
+
+ actual++;
+ }
+
+ DEBUG( 4, __FUNCTION__ "(), fifo_size %d ; %d sent of %d\n",
+ fifo_size, actual, len);
+
+ return actual;
+}
+
+/*
+ * Function irport_xmit (void)
+ *
+ * Transmits the current frame until FIFO is full, then
+ * waits until the next transmitt interrupt, and continues until the
+ * frame is transmited.
+ */
+int irport_hard_xmit( struct sk_buff *skb, struct device *dev)
+{
+ struct irda_device *idev;
+ int xbofs;
+ int actual;
+
+ DEBUG( 4, __FUNCTION__ "()\n");
+
+ ASSERT( dev != NULL, return -1;);
+
+ if ( dev->tbusy) {
+ DEBUG( 4, __FUNCTION__ "(), tbusy==TRUE\n");
+
+ return -EBUSY;
+ }
+
+ idev = (struct irda_device *) dev->priv;
+
+ ASSERT( idev != NULL, return -1;);
+ ASSERT( idev->magic == IRDA_DEVICE_MAGIC, return -1;);
+
+ /* Lock transmit buffer */
+ if ( irda_lock( (void *) &dev->tbusy) == FALSE)
+ return -EBUSY;
+
+ /*
+ * Transfer skb to tx_buff while wrapping, stuffing and making CRC
+ */
+ idev->tx_buff.len = async_wrap_skb( skb, idev->tx_buff.data,
+ idev->tx_buff.truesize);
+
+ actual = irport_write( idev->io.iobase2, idev->io.fifo_size,
+ idev->tx_buff.data, idev->tx_buff.len);
+
+ idev->tx_buff.offset = actual;
+ idev->tx_buff.head = idev->tx_buff.data + actual;
+
+ dev_kfree_skb( skb);
+
+ return 0;
+}
+
+/*
+ * Function irport_receive (void)
+ *
+ * Receive one frame from the infrared port
+ *
+ */
+static void irport_receive( struct irda_device *idev)
+{
+ int iobase;
+
+ if ( !idev)
+ return;
+
+ DEBUG( 4, __FUNCTION__ "()\n");
+
+ iobase = idev->io.iobase2;
+
+ if ( idev->rx_buff.len == 0)
+ idev->rx_buff.head = idev->rx_buff.data;
+
+ /*
+ * Receive all characters in Rx FIFO, unwrap and unstuff them.
+ * async_unwrap_char will deliver all found frames
+ */
+ do {
+ async_unwrap_char( idev, inb( iobase+UART_RX));
+
+ } while ( inb( iobase+UART_LSR) & UART_LSR_DR);
+}
+
+#ifdef MODULE
+
+/*
+ * Function cleanup_module (void)
+ *
+ *
+ *
+ */
+void cleanup_module(void)
+{
+ irport_cleanup();
+}
+
+/*
+ * Function init_module (void)
+ *
+ *
+ */
+int init_module(void)
+{
+ if (irport_init() < 0) {
+ cleanup_module();
+ return 1;
+ }
+ return(0);
+}
+
+#endif /* MODULE */
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-10-06 18:18:20 +0000