patch-2.3.99-pre1 linux/drivers/net/wan/comx-hw-locomx.c

• Lines: 497
• Date: Mon Mar 13 13:55:09 2000
• Orig file: v2.3.51/linux/drivers/net/wan/comx-hw-locomx.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.51/linux/drivers/net/wan/comx-hw-locomx.c linux/drivers/net/wan/comx-hw-locomx.c
@@ -0,0 +1,496 @@
+/*
+ * Hardware driver for the LoCOMX card, using the generic z85230
+ * functions
+ *
+ * Author: Gergely Madarasz <gorgo@itc.hu>
+ *
+ * Based on skeleton code and old LoCOMX driver by Tivadar Szemethy <tiv@itc.hu> 
+ * and the hostess_sv11 driver
+ *
+ * Copyright (C) 1999 ITConsult-Pro Co. <info@itc.hu>
+ *
+ * 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.
+ *
+ * Version 0.10 (99/06/17):
+ *		- rewritten for the z85230 layer
+ *
+ * Version 0.11 (99/06/21):
+ *		- some printk's fixed
+ *		- get rid of a memory leak (it was impossible though :))
+ * 
+ * Version 0.12 (99/07/07):
+ *		- check CTS for modem lines, not DCD (which is always high
+ *		  in case of this board)
+ * Version 0.13 (99/07/08):
+ *		- Fix the transmitter status check
+ *		- Handle the net device statistics better
+ */
+
+#define VERSION "0.13"
+
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/netdevice.h>
+#include <linux/proc_fs.h>
+#include <asm/types.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+
+#include "comx.h"
+#include "z85230.h"
+
+MODULE_AUTHOR("Gergely Madarasz <gorgo@itc.hu>");
+MODULE_DESCRIPTION("Hardware driver for the LoCOMX board");
+
+#define RX_DMA 3
+#define TX_DMA 1
+#define LOCOMX_ID 0x33
+#define LOCOMX_IO_EXTENT 8
+#define LOCOMX_DEFAULT_IO 0x368
+#define LOCOMX_DEFAULT_IRQ 7
+
+u8 z8530_locomx[] = {
+	11,     TCRTxCP,
+	14,     DTRREQ,
+	255
+};
+
+struct locomx_data {
+	int	io_extent;
+	struct	z8530_dev board;
+	struct timer_list status_timer;
+};
+
+static int LOCOMX_txe(struct net_device *dev)
+{
+	struct comx_channel *ch = dev->priv;
+	struct locomx_data *hw = ch->HW_privdata;
+
+	return (!hw->board.chanA.tx_next_skb);
+}
+
+
+static void locomx_rx(struct z8530_channel *c, struct sk_buff *skb)
+{
+	struct net_device *dev=c->netdevice;
+	struct comx_channel *ch=dev->priv;
+	
+	if (ch->debug_flags & DEBUG_HW_RX) {
+		comx_debug_skb(dev, skb, "locomx_rx receiving");
+	}
+	ch->LINE_rx(dev,skb);
+}
+
+static int LOCOMX_send_packet(struct net_device *dev, struct sk_buff *skb) 
+{
+	struct comx_channel *ch = (struct comx_channel *)dev->priv;
+	struct locomx_data *hw = ch->HW_privdata;
+
+	if (ch->debug_flags & DEBUG_HW_TX) {
+		comx_debug_bytes(dev, skb->data, skb->len, "LOCOMX_send_packet");
+	}
+
+	if (!(ch->line_status & LINE_UP)) {
+		return FRAME_DROPPED;
+	}
+
+	if(z8530_queue_xmit(&hw->board.chanA,skb)) {
+		printk(KERN_WARNING "%s: FRAME_DROPPED\n",dev->name);
+		return FRAME_DROPPED;
+	}
+
+	if (ch->debug_flags & DEBUG_HW_TX) {
+		comx_debug(dev, "%s: LOCOMX_send_packet was successful\n\n", dev->name);
+	}
+
+	if(!hw->board.chanA.tx_next_skb) {
+		return FRAME_QUEUED;
+	} else {
+		return FRAME_ACCEPTED;
+	}
+}
+
+static void locomx_status_timerfun(unsigned long d)
+{
+	struct net_device *dev=(struct net_device *)d;
+	struct comx_channel *ch=dev->priv;
+	struct locomx_data *hw=ch->HW_privdata;
+
+	if(!(ch->line_status & LINE_UP) &&
+	    (hw->board.chanA.status & CTS)) {
+		ch->LINE_status(dev, ch->line_status | LINE_UP);
+	}
+	if((ch->line_status & LINE_UP) &&
+	    !(hw->board.chanA.status & CTS)) {
+		ch->LINE_status(dev, ch->line_status & ~LINE_UP);
+	}
+	mod_timer(&hw->status_timer,jiffies + ch->lineup_delay * HZ);
+}
+
+
+static int LOCOMX_open(struct net_device *dev)
+{
+	struct comx_channel *ch = dev->priv;
+	struct locomx_data *hw = ch->HW_privdata;
+	struct proc_dir_entry *procfile = ch->procdir->subdir;
+	unsigned long flags;
+	int ret;
+
+	if (!dev->base_addr || !dev->irq) {
+		return -ENODEV;
+	}
+
+	if (check_region(dev->base_addr, hw->io_extent)) {
+		return -EAGAIN;
+	}
+
+	request_region(dev->base_addr, hw->io_extent, dev->name);
+
+	hw->board.chanA.ctrlio=dev->base_addr + 5;
+	hw->board.chanA.dataio=dev->base_addr + 7;
+	
+	hw->board.irq=dev->irq;
+	hw->board.chanA.netdevice=dev;
+	hw->board.chanA.dev=&hw->board;
+	hw->board.name=dev->name;
+	hw->board.chanA.txdma=TX_DMA;
+	hw->board.chanA.rxdma=RX_DMA;
+	hw->board.chanA.irqs=&z8530_nop;
+	hw->board.chanB.irqs=&z8530_nop;
+
+	if(request_irq(dev->irq, z8530_interrupt, SA_INTERRUPT, 
+	    dev->name, &hw->board)) {
+		printk(KERN_ERR "%s: unable to obtain irq %d\n", dev->name, 
+			dev->irq);
+		ret=-EAGAIN;
+		goto irq_fail;
+	}
+	if(request_dma(TX_DMA,"LoCOMX (TX)")) {
+		printk(KERN_ERR "%s: unable to obtain TX DMA (DMA channel %d)\n", 
+			dev->name, TX_DMA);
+		ret=-EAGAIN;
+		goto dma1_fail;
+	}
+
+	if(request_dma(RX_DMA,"LoCOMX (RX)")) {
+		printk(KERN_ERR "%s: unable to obtain RX DMA (DMA channel %d)\n", 
+			dev->name, RX_DMA);
+		ret=-EAGAIN;
+		goto dma2_fail;
+	}
+	
+	save_flags(flags); 
+	cli();
+
+	if(z8530_init(&hw->board)!=0)
+	{
+		printk(KERN_ERR "%s: Z8530 device not found.\n",dev->name);
+		ret=-ENODEV;
+		goto z8530_fail;
+	}
+
+	hw->board.chanA.dcdcheck=CTS;
+
+	z8530_channel_load(&hw->board.chanA, z8530_hdlc_kilostream_85230);
+	z8530_channel_load(&hw->board.chanA, z8530_locomx);
+	z8530_channel_load(&hw->board.chanB, z8530_dead_port);
+
+	z8530_describe(&hw->board, "I/O", dev->base_addr);
+
+	if((ret=z8530_sync_dma_open(dev, &hw->board.chanA))!=0) {
+		goto z8530_fail;
+	}
+
+	restore_flags(flags);
+
+
+	hw->board.active=1;
+	hw->board.chanA.rx_function=locomx_rx;
+
+	ch->init_status |= HW_OPEN;
+	if (hw->board.chanA.status & DCD) {
+		ch->line_status |= LINE_UP;
+	} else {
+		ch->line_status &= ~LINE_UP;
+	}
+
+	comx_status(dev, ch->line_status);
+
+	init_timer(&hw->status_timer);
+	hw->status_timer.function=locomx_status_timerfun;
+	hw->status_timer.data=(unsigned long)dev;
+	hw->status_timer.expires=jiffies + ch->lineup_delay * HZ;
+	add_timer(&hw->status_timer);
+
+	for (; procfile ; procfile = procfile->next) {
+		if (strcmp(procfile->name, FILENAME_IO) == 0 ||
+		     strcmp(procfile->name, FILENAME_IRQ) == 0) {
+			procfile->mode = S_IFREG |  0444;
+		}
+	}
+	return 0;
+
+z8530_fail:
+	restore_flags(flags);
+	free_dma(RX_DMA);
+dma2_fail:
+	free_dma(TX_DMA);
+dma1_fail:
+	free_irq(dev->irq, &hw->board);
+irq_fail:
+	release_region(dev->base_addr, hw->io_extent);
+	return ret;
+}
+
+static int LOCOMX_close(struct net_device *dev)
+{
+	struct comx_channel *ch = dev->priv;
+	struct locomx_data *hw = ch->HW_privdata;
+	struct proc_dir_entry *procfile = ch->procdir->subdir;
+
+	hw->board.chanA.rx_function=z8530_null_rx;
+	netif_stop_queue(dev);
+	z8530_sync_dma_close(dev, &hw->board.chanA);
+
+	z8530_shutdown(&hw->board);
+
+	del_timer(&hw->status_timer);
+	free_dma(RX_DMA);
+	free_dma(TX_DMA);
+	free_irq(dev->irq,&hw->board);
+	release_region(dev->base_addr,8);
+
+	for (; procfile ; procfile = procfile->next) {
+		if (strcmp(procfile->name, FILENAME_IO) == 0 ||
+		    strcmp(procfile->name, FILENAME_IRQ) == 0) {
+			procfile->mode = S_IFREG |  0644;
+		}
+	}
+
+	ch->init_status &= ~HW_OPEN;
+	return 0;
+}
+
+static int LOCOMX_statistics(struct net_device *dev,char *page)
+{
+	int len = 0;
+
+	len += sprintf(page + len, "Hello\n");
+
+	return len;
+}
+
+static int LOCOMX_dump(struct net_device *dev) {
+	printk(KERN_INFO "LOCOMX_dump called\n");
+	return(-1);
+}
+
+static int locomx_read_proc(char *page, char **start, off_t off, int count,
+	int *eof, void *data)
+{
+	struct proc_dir_entry *file = (struct proc_dir_entry *)data;
+	struct net_device *dev = file->parent->data;
+	int len = 0;
+
+	if (strcmp(file->name, FILENAME_IO) == 0) {
+		len = sprintf(page, "0x%x\n", (unsigned int)dev->base_addr);
+	} else if (strcmp(file->name, FILENAME_IRQ) == 0) {
+		len = sprintf(page, "%d\n", (unsigned int)dev->irq);
+	} else {
+		printk(KERN_ERR "hw_read_proc: internal error, filename %s\n", 
+			file->name);
+		return -EBADF;
+	}
+
+	if (off >= len) {
+		*eof = 1;
+		return 0;
+	}
+
+	*start = page + off;
+	if (count >= len - off) {
+		*eof = 1;
+	}
+	return ( min(count, len - off) );
+}
+
+static int locomx_write_proc(struct file *file, const char *buffer,
+	u_long count, void *data)
+{
+	struct proc_dir_entry *entry = (struct proc_dir_entry *)data;
+	struct net_device *dev = (struct net_device *)entry->parent->data;
+	int val;
+	char *page;
+
+	if (file->f_dentry->d_inode->i_ino != entry->low_ino) {
+		printk(KERN_ERR "hw_write_proc: file <-> data internal error\n");
+		return -EIO;
+	}
+
+	if (!(page = (char *)__get_free_page(GFP_KERNEL))) {
+		return -ENOMEM;
+	}
+
+	copy_from_user(page, buffer, count = min(count, PAGE_SIZE));
+	if (*(page + count - 1) == '\n') {
+		*(page + count - 1) = 0;
+	}
+
+	if (strcmp(entry->name, FILENAME_IO) == 0) {
+		val = simple_strtoul(page, NULL, 0);
+		if (val != 0x360 && val != 0x368 && val != 0x370 && 
+		   val != 0x378) {
+			printk(KERN_ERR "LoCOMX: incorrect io address!\n");	
+		} else {
+			dev->base_addr = val;
+		}
+	} else if (strcmp(entry->name, FILENAME_IRQ) == 0) {
+		val = simple_strtoul(page, NULL, 0);
+		if (val != 3 && val != 4 && val != 5 && val != 6 && val != 7) {
+			printk(KERN_ERR "LoCOMX: incorrect irq value!\n");
+		} else {
+			dev->irq = val;
+		}	
+	} else {
+		printk(KERN_ERR "locomx_write_proc: internal error, filename %s\n", 
+			entry->name);
+		free_page((unsigned long)page);
+		return -EBADF;
+	}
+
+	free_page((unsigned long)page);
+	return count;
+}
+
+
+
+static int LOCOMX_init(struct net_device *dev) 
+{
+	struct comx_channel *ch = (struct comx_channel *)dev->priv;
+	struct locomx_data *hw;
+	struct proc_dir_entry *new_file;
+
+	/* Alloc data for private structure */
+	if ((ch->HW_privdata = kmalloc(sizeof(struct locomx_data), 
+	   GFP_KERNEL)) == NULL) {
+	   	return -ENOMEM;
+	}
+
+	memset(hw = ch->HW_privdata, 0, sizeof(struct locomx_data));
+	hw->io_extent = LOCOMX_IO_EXTENT;
+
+	/* Register /proc files */
+	if ((new_file = create_proc_entry(FILENAME_IO, S_IFREG | 0644, 
+	    ch->procdir)) == NULL) {
+		return -EIO;
+	}
+	new_file->data = (void *)new_file;
+	new_file->read_proc = &locomx_read_proc;
+	new_file->write_proc = &locomx_write_proc;
+	new_file->proc_iops = &comx_normal_inode_ops;
+	new_file->nlink = 1;
+
+	if ((new_file = create_proc_entry(FILENAME_IRQ, S_IFREG | 0644, 
+	    ch->procdir)) == NULL)  {
+		return -EIO;
+	}
+	new_file->data = (void *)new_file;
+	new_file->read_proc = &locomx_read_proc;
+	new_file->write_proc = &locomx_write_proc;
+	new_file->proc_iops = &comx_normal_inode_ops;
+	new_file->nlink = 1;
+
+/* 	No clock yet */
+/*
+	if ((new_file = create_proc_entry(FILENAME_CLOCK, S_IFREG | 0644, 
+	    ch->procdir)) == NULL) {
+		return -EIO;
+	}
+	new_file->data = (void *)new_file;
+	new_file->read_proc = &locomx_read_proc;
+	new_file->write_proc = &locomx_write_proc;
+	new_file->proc_iops = &comx_normal_inode_ops;
+	new_file->nlink = 1;
+*/
+
+	ch->HW_access_board = NULL;
+	ch->HW_release_board = NULL;
+	ch->HW_txe = LOCOMX_txe;
+	ch->HW_open = LOCOMX_open;
+	ch->HW_close = LOCOMX_close;
+	ch->HW_send_packet = LOCOMX_send_packet;
+	ch->HW_statistics = LOCOMX_statistics;
+	ch->HW_set_clock = NULL;
+
+	ch->current_stats = &hw->board.chanA.stats;
+	memcpy(ch->current_stats, &ch->stats, sizeof(struct net_device_stats));
+
+	dev->base_addr = LOCOMX_DEFAULT_IO;
+	dev->irq = LOCOMX_DEFAULT_IRQ;
+	
+	
+	/* O.K. Count one more user on this module */
+	MOD_INC_USE_COUNT;
+	return 0;
+}
+
+
+static int LOCOMX_exit(struct net_device *dev)
+{
+	struct comx_channel *ch = (struct comx_channel *)dev->priv;
+
+	ch->HW_access_board = NULL;
+	ch->HW_release_board = NULL;
+	ch->HW_txe = NULL;
+	ch->HW_open = NULL;
+	ch->HW_close = NULL;
+	ch->HW_send_packet = NULL;
+	ch->HW_statistics = NULL;
+	ch->HW_set_clock = NULL;
+	memcpy(&ch->stats, ch->current_stats, sizeof(struct net_device_stats));
+	ch->current_stats = &ch->stats;
+
+	kfree(ch->HW_privdata);
+
+	remove_proc_entry(FILENAME_IO, ch->procdir);
+	remove_proc_entry(FILENAME_IRQ, ch->procdir);
+//	remove_proc_entry(FILENAME_CLOCK, ch->procdir);
+
+	MOD_DEC_USE_COUNT;
+	return 0;
+}
+
+static struct comx_hardware locomx_hw = {
+	"locomx",
+	VERSION,
+	LOCOMX_init, 
+	LOCOMX_exit,
+	LOCOMX_dump,
+	NULL
+};
+	
+#ifdef MODULE
+#define comx_hw_locomx_init init_module
+#endif
+
+int __init comx_hw_locomx_init(void)
+{
+	comx_register_hardware(&locomx_hw);
+	return 0;
+}
+
+#ifdef MODULE
+void cleanup_module(void)
+{
+	comx_unregister_hardware("locomx");
+	return;
+}
+#endif