/*
* Sealevel Systems 4021 driver.
*
* 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.
*
* (c) Copyright 1999, 2001 Alan Cox
* (c) Copyright 2001 Red Hat Inc.
* Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl>
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/net.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/delay.h>
#include <linux/hdlc.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <net/arp.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/byteorder.h>
#include "z85230.h"
struct slvl_device
{
struct z8530_channel *chan;
int channel;
};
struct slvl_board
{
struct slvl_device dev[2];
struct z8530_dev board;
int iobase;
};
/*
* Network driver support routines
*/
static inline struct slvl_device* dev_to_chan(struct net_device *dev)
{
return (struct slvl_device *)dev_to_hdlc(dev)->priv;
}
/*
* Frame receive. Simple for our card as we do HDLC and there
* is no funny garbage involved
*/
static void sealevel_input(struct z8530_channel *c, struct sk_buff *skb)
{
/* Drop the CRC - it's not a good idea to try and negotiate it ;) */
skb_trim(skb, skb->len - 2);
skb->protocol = hdlc_type_trans(skb, c->netdevice);
skb_reset_mac_header(skb);
skb->dev = c->netdevice;
netif_rx(skb);
}
/*
* We've been placed in the UP state
*/
static int sealevel_open(struct net_device *d)
{
struct slvl_device *slvl = dev_to_chan(d);
int err = -1;
int unit = slvl->channel;
/*
* Link layer up.
*/
switch (unit) {
case 0:
err = z8530_sync_dma_open(d, slvl->chan);
break;
case 1:
err = z8530_sync_open(d, slvl->chan);
break;
}
if (err)
return err;
err = hdlc_open(d);
if (err) {
switch (unit) {
case 0:
z8530_sync_dma_close(d, slvl->chan);
break;
case 1:
z8530_sync_close(d, slvl->chan);
break;
}
return err;
}
slvl->chan->rx_function = sealevel_input;
/*
* Go go go
*/
netif_start_queue(d);
return 0;
}
static int sealevel_close(struct net_device *d)
{
struct slvl_device *slvl = dev_to_chan(d);
int unit = slvl->channel;
/*
* Discard new frames
*/
slvl->chan->rx_function = z8530_null_rx;
hdlc_close(d);
netif_stop_queue(d);
switch (unit) {
case 0:
z8530_sync_dma_close(d, slvl->chan);
break;
case 1:
z8530_sync_close(d, slvl->chan);
break;
}
return 0;
}
static int sealevel_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
{
/* struct slvl_device *slvl=dev_to_chan(d);
z8530_ioctl(d,&slvl->sync.chanA,ifr,cmd) */
return hdlc_ioctl(d, ifr, cmd);
}
/*
* Passed network frames, fire them downwind.
*/
static netdev_tx_t sealevel_queue_xmit(struct sk_buff *skb,
struct net_device *d)
{
return z8530_queue_xmit(dev_to_chan(d)->chan, skb);
}
static int sealevel_attach(struct net_device *dev, unsigned short encoding,
unsigned short parity)
{
if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
return 0;
return -EINVAL;
}
static const struct net_device_ops sealevel_ops = {
.ndo_open = sealevel_open,
.ndo_stop = sealevel_close,
.ndo_change_mtu = hdlc_change_mtu,
.ndo_start_xmit = hdlc_start_xmit,
.ndo_do_ioctl = sealevel_ioctl,
};
static int slvl_setup(struct slvl_device *sv, int iobase, int irq)
{
struct net_device *dev = alloc_hdlcdev(sv);
if (!dev)
return -1;
dev_to_hdlc(dev)->attach = sealevel_attach;
dev_to_hdlc(dev)->xmit = sealevel_queue_xmit;
dev->netdev_ops = &sealevel_ops;
dev->base_addr = iobase;
dev->irq = irq;
if (register_hdlc_device(dev)) {
printk(KERN_ERR "sealevel: unable to register HDLC device\n");
free_netdev(dev);
return -1;
}
sv->chan->netdevice = dev;
return 0;
}
/*
* Allocate and setup Sealevel board.
*/
static __init struct slvl_board *slvl_init(int iobase, int irq,
int txdma, int rxdma, int slow)
{
struct z8530_dev *dev;
struct slvl_board *b;
/*
* Get the needed I/O space
*/
if (!request_region(iobase, 8, "Sealevel 4021")) {
printk(KERN_WARNING "sealevel: I/O 0x%X already in use.\n",
iobase);
return NULL;
}
b = kzalloc(sizeof(struct slvl_board), GFP_KERNEL);
if (!b)
goto err_kzalloc;
b->dev[0].chan = &b->board.chanA;
b->dev[0].channel = 0;
b->dev[1].chan = &b->board.chanB;
b->dev[1].channel = 1;
dev = &b->board;
/*
* Stuff in the I/O addressing
*/
dev->active = 0;
b->iobase = iobase;
/*
* Select 8530 delays for the old board
*/
if (slow)
iobase |= Z8530_PORT_SLEEP;
dev->chanA.ctrlio = iobase + 1;
dev->chanA.dataio = iobase;
dev->chanB.ctrlio = iobase + 3;
dev->chanB.dataio = iobase + 2;
dev->chanA.irqs = &z8530_nop;
dev->chanB.irqs = &z8530_nop;
/*
* Assert DTR enable DMA
*/
outb(3 | (1 << 7), b->iobase + 4);
/* We want a fast IRQ for this device. Actually we'd like an even faster
IRQ ;) - This is one driver RtLinux is made for */
if (request_irq(irq, z8530_interrupt, IRQF_DISABLED,
"SeaLevel", dev) < 0) {
printk(KERN_WARNING "sealevel: IRQ %d already in use.\n", irq);
goto err_request_irq;
}
dev->irq = irq;
dev->chanA.private = &b->dev[0];
dev->chanB.private = &b->dev[1];
dev->chanA.dev = dev;
dev->chanB.dev = dev;
dev->chanA.txdma = 3;
dev->chanA.rxdma = 1;
if (request_dma(dev->chanA.txdma, "SeaLevel (TX)"))
goto err_dma_tx;
if (request_dma(dev->chanA.rxdma, "SeaLevel (RX)"))
goto err_dma_rx;
disable_irq(irq);
/*
* Begin normal initialise
*/
if (z8530_init(dev) != 0) {
printk(KERN_ERR "Z8530 series device not found.\n");
enable_irq(irq);
goto free_hw;
}
if (dev->type == Z85C30) {
z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream);
z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream);
} else {
z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream_85230);
z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream_85230);
}
/*
* Now we can take the IRQ
*/
enable_irq(irq);
if (slvl_setup(&b->dev[0], iobase, irq))
goto free_hw;
if (slvl_setup(&b->dev[1], iobase, irq))
goto free_netdev0;
z8530_describe(dev, "I/O", iobase);
dev->active = 1;
return b;
free_netdev0:
unregister_hdlc_device(b->dev[0].chan->netdevice);
free_netdev(b->dev[0].chan->netdevice);
free_hw:
free_dma(dev->chanA.rxdma);
err_dma_rx:
free_dma(dev->chanA.txdma);
err_dma_tx:
free_irq(irq, dev);
err_request_irq:
kfree(b);
err_kzalloc:
release_region(iobase, 8);
return NULL;
}
static void __exit slvl_shutdown(struct slvl_board *b)
{
int u;
z8530_shutdown(&b->board);
for (u = 0; u < 2; u++) {
struct net_device *d = b->dev[u].chan->netdevice;
unregister_hdlc_device(d);
free_netdev(d);
}
free_irq(b->board.irq, &b->board);
free_dma(b->board.chanA.rxdma);
free_dma(b->board.chanA.txdma);
/* DMA off on the card, drop DTR */
outb(0, b->iobase);
release_region(b->iobase, 8);
kfree(b);
}
static int io=0x238;
static int txdma=1;
static int rxdma=3;
static int irq=5;
static int slow=0;
module_param(io, int, 0);
MODULE_PARM_DESC(io, "The I/O base of the Sealevel card");
module_param(txdma, int, 0);
MODULE_PARM_DESC(txdma, "Transmit DMA channel");
module_param(rxdma, int, 0);
MODULE_PARM_DESC(rxdma, "Receive DMA channel");
module_param(irq, int, 0);
MODULE_PARM_DESC(irq, "The interrupt line setting for the SeaLevel card");
module_param(slow, bool, 0);
MODULE_PARM_DESC(slow, "Set this for an older Sealevel card such as the 4012");
MODULE_AUTHOR("Alan Cox");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Modular driver for the SeaLevel 4021");
static struct slvl_board *slvl_unit;
static int __init slvl_init_module(void)
{
slvl_unit = slvl_init(io, irq, txdma, rxdma, slow);
return slvl_unit ? 0 : -ENODEV;
}
static void __exit slvl_cleanup_module(void)
{
if (slvl_unit)
slvl_shutdown(slvl_unit);
}
module_init(slvl_init_module);
module_exit(slvl_cleanup_module);
