patch-2.2.16 linux/drivers/net/c101.c

• Lines: 277
• Date: Wed Jun 7 14:26:43 2000
• Orig file: v2.2.15/linux/drivers/net/c101.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN v2.2.15/linux/drivers/net/c101.c linux/drivers/net/c101.c
@@ -0,0 +1,276 @@
+/*
+ * Moxa C101 synchronous serial card driver for Linux
+ *
+ * Copyright (C) 2000 Krzysztof Halasa <khc@pm.waw.pl>
+ *
+ * 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.
+ *
+ * Requires hdlc.c, a generic HDLC support module
+ * Available from ftp://ftp.pm.waw.pl/pub/Linux/hdlc/
+ *
+ * Current status:
+ *    - this is work in progress
+ *    - no support for SMP yet
+ *
+ * Sources of information:
+ *    Hitachi HD64570 SCA User's Manual
+ *    Moxa C101 User's Manual
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/malloc.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <asm/io.h>
+#include <asm/delay.h>
+
+#include "syncppp.h"
+#include <linux/hdlc.h>
+#include "hd64570.h"
+
+#define DEBUG_RINGS
+#undef DEBUG_PKT
+
+static const char* version = "Moxa C101 driver revision: 1.0-pre9";
+static const char* devname = "C101";
+
+#define C101_PAGE 0x1D00
+#define C101_DTR 0x1E00
+#define C101_SCA 0x1F00
+#define C101_WINDOW_SIZE 0x2000
+
+#define RAM_SIZE (256*1024)
+#define CLOCK_BASE 9830400	/* 9.8304 MHz */
+#define PAGE0_ALWAYS_MAPPED
+
+static char *hw=NULL;		/* pointer to hw=xxx command line string */
+
+
+typedef struct card_s {
+	hdlc_device hdlc;	/* HDLC device struct - must be first */
+	int clkmode;		/* clock speed, 0=ext */
+	int loopback;
+	u8 *win0base;		/* ISA window base address */
+	u16 buff_offset;	/* offset of first buffer of first channel */
+	u8 irq;			/* IRQ (3-15) */
+	u8 ring_buffers;	/* number of buffers in a ring */
+	u8 page;
+
+	u8 rxin;		/* rx ring buffer 'in' pointer */
+	u8 txin;		/* tx ring buffer 'in' and 'last' pointers */
+	u8 txlast;
+
+	struct card_s *next_card;
+}card_t;
+
+typedef card_t port_t;
+
+
+#define sca_in(reg, card)	     readb(card->win0base+C101_SCA+reg)
+#define sca_out(value, reg, card)    writeb(value, card->win0base+C101_SCA+reg)
+#define sca_inw(reg, card)	     readw(card->win0base+C101_SCA+reg)
+#define sca_outw(value, reg, card)   writew(value, card->win0base+C101_SCA+reg)
+
+#define port_to_card(port)	     (port)
+#define log_node(port)		     (0)
+#define phy_node(port)		     (0)
+#define winsize(card)		     (C101_WINDOW_SIZE)
+#define win0base(card)		     (card->win0base)
+#define winbase(card)      	     (card->win0base+0x2000)
+#define get_port(card, port)	     (port == 0 ? card : NULL)
+
+
+static __inline__ u8 get_page(card_t *card)
+{
+	return card->page;
+}
+
+
+
+static __inline__ void openwin(card_t *card, u8 page)
+{
+	card->page=page;
+	writeb(page, card->win0base+C101_PAGE);
+}
+
+
+#define close_windows(card) {} /* no hardware support */
+
+
+static __inline__ int set_clock(port_t *port, int clock)
+{
+	port->clkmode = clock;	/* selectable by jumper */
+	return 0;
+}
+
+
+#define select_phys_iface(port, iface) (-EINVAL) /* No hardware support */
+
+
+static __inline__ void open_port(port_t *port)
+{
+	writeb(1, port->win0base+C101_DTR);
+}
+
+
+static __inline__ void close_port(port_t *port)
+{
+	writeb(0, port->win0base+C101_DTR);
+}
+
+
+#include "hd6457x.c"
+
+
+static void c101_destroy_card(card_t *card)
+{
+	if (card->irq)
+		free_irq(card->irq, card);
+
+	kfree(card);
+}
+
+
+
+static int c101_run(unsigned long irq, unsigned long winbase)
+{
+	card_t *card;
+	int result;
+
+
+	if (irq<3 || irq>15 || irq == 6) /* FIXME */ {
+		printk(KERN_ERR "c101: invalid IRQ value\n");
+		return -ENODEV;
+	}
+    
+	if (winbase<0xC0000 || winbase>0xDFFFF || (winbase&0x3FFF)!=0) {
+		printk(KERN_ERR "c101: invalid RAM value\n");
+		return -ENODEV;
+	}
+
+	card=kmalloc(sizeof(card_t), GFP_KERNEL);
+	if (card==NULL) {
+		printk(KERN_ERR "c101: unable to allocate memory\n");
+		return -ENOBUFS;
+	}
+	memset(card, 0, sizeof(card_t));
+
+	if (request_irq(irq, sca_intr, 0, devname, card)) {
+		printk(KERN_ERR "c101: could not allocate IRQ\n");
+		c101_destroy_card(card);
+		return(-EBUSY);
+	}
+	card->irq=irq;
+
+	card->win0base=(u8*)winbase;
+
+	/* 2 rings required for 1 port */
+	card->ring_buffers = (RAM_SIZE-C101_WINDOW_SIZE) / (2 * HDLC_MAX_MTU);
+	printk(KERN_DEBUG "c101: using %u packets rings\n",card->ring_buffers);
+
+	card->buff_offset = C101_WINDOW_SIZE; /* Bytes 1D00-1FFF reserved */
+
+	readb(card->win0base+C101_PAGE); /* Resets SCA? */
+	udelay(100);
+	writeb(0, card->win0base+C101_PAGE);
+	writeb(0, card->win0base+C101_DTR); /* Power-up for RAM? */
+
+	sca_init(card, 0);
+
+	card->hdlc.ioctl=sca_ioctl;
+	card->hdlc.open=sca_open;
+	card->hdlc.close=sca_close;
+	hdlc_to_dev(&card->hdlc)->hard_start_xmit=sca_xmit;
+	hdlc_to_dev(&card->hdlc)->irq=irq;
+	hdlc_to_dev(&card->hdlc)->tx_queue_len=50;
+
+	result=register_hdlc_device(&card->hdlc);
+	if (result) {
+		printk(KERN_WARNING "c101: unable to register hdlc device\n");
+		c101_destroy_card(card);
+		return result;
+	}
+
+	sca_init_sync_port(card); /* Set up C101 memory */
+
+	*new_card=card;
+	new_card=&card->next_card;
+	return 0;
+}
+
+
+
+void c101_init(void)
+{
+	if (hw==NULL)
+		return;
+
+	printk(KERN_INFO "%s\n", version);
+
+	do {
+		unsigned long irq, ram;
+
+		irq=simple_strtoul(hw, &hw, 0);
+    
+		if (*hw++ != ',')
+			break;
+		ram=simple_strtoul(hw, &hw, 0);
+
+		if (*hw == ':' || *hw == '\x0')
+			c101_run(irq, ram);
+
+		if (*hw == '\x0')
+			return;
+	}while(*hw++ == ':');
+
+	printk(KERN_ERR "c101: invalid hardware parameters\n");
+}
+
+
+#ifndef MODULE
+
+void c101_setup(char *str, int *ints)
+{
+	hw=str;
+}
+
+#else
+
+MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
+MODULE_DESCRIPTION("Moxa C101 serial port driver");
+MODULE_PARM(hw, "s");		/* hw=irq,ram,clock:irq,... */
+EXPORT_NO_SYMBOLS;
+
+int init_module(void)
+{
+	if (hw==NULL) {
+		printk(KERN_ERR "c101: no card initialized\n");
+		return -ENOSYS;	/* no parameters specified, abort */
+	}
+
+	c101_init();
+	return first_card ? 0 : -ENOSYS;
+}
+
+
+
+void cleanup_module(void)
+{
+	card_t *card=first_card;
+
+	while (card) {
+		card_t *ptr=card;
+		card=card->next_card;
+		unregister_hdlc_device(&ptr->hdlc);
+		c101_destroy_card(ptr);
+	}
+}
+
+#endif /* MODULE */