353 lines
7.2 KiB
C
353 lines
7.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Comtrol SV11 card driver
|
|
*
|
|
* This is a slightly odd Z85230 synchronous driver. All you need to
|
|
* know basically is
|
|
*
|
|
* Its a genuine Z85230
|
|
*
|
|
* It supports DMA using two DMA channels in SYNC mode. The driver doesn't
|
|
* use these facilities
|
|
*
|
|
* The control port is at io+1, the data at io+3 and turning off the DMA
|
|
* is done by writing 0 to io+4
|
|
*
|
|
* The hardware does the bus handling to avoid the need for delays between
|
|
* touching control registers.
|
|
*
|
|
* Port B isn't wired (why - beats me)
|
|
*
|
|
* Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl>
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#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/slab.h>
|
|
#include <net/arp.h>
|
|
|
|
#include <asm/irq.h>
|
|
#include <asm/io.h>
|
|
#include <asm/dma.h>
|
|
#include <asm/byteorder.h>
|
|
#include "z85230.h"
|
|
|
|
static int dma;
|
|
|
|
/*
|
|
* Network driver support routines
|
|
*/
|
|
|
|
static inline struct z8530_dev* dev_to_sv(struct net_device *dev)
|
|
{
|
|
return (struct z8530_dev *)dev_to_hdlc(dev)->priv;
|
|
}
|
|
|
|
/*
|
|
* Frame receive. Simple for our card as we do HDLC and there
|
|
* is no funny garbage involved
|
|
*/
|
|
|
|
static void hostess_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;
|
|
/*
|
|
* Send it to the PPP layer. We don't have time to process
|
|
* it right now.
|
|
*/
|
|
netif_rx(skb);
|
|
}
|
|
|
|
/*
|
|
* We've been placed in the UP state
|
|
*/
|
|
|
|
static int hostess_open(struct net_device *d)
|
|
{
|
|
struct z8530_dev *sv11 = dev_to_sv(d);
|
|
int err = -1;
|
|
|
|
/*
|
|
* Link layer up
|
|
*/
|
|
switch (dma) {
|
|
case 0:
|
|
err = z8530_sync_open(d, &sv11->chanA);
|
|
break;
|
|
case 1:
|
|
err = z8530_sync_dma_open(d, &sv11->chanA);
|
|
break;
|
|
case 2:
|
|
err = z8530_sync_txdma_open(d, &sv11->chanA);
|
|
break;
|
|
}
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
err = hdlc_open(d);
|
|
if (err) {
|
|
switch (dma) {
|
|
case 0:
|
|
z8530_sync_close(d, &sv11->chanA);
|
|
break;
|
|
case 1:
|
|
z8530_sync_dma_close(d, &sv11->chanA);
|
|
break;
|
|
case 2:
|
|
z8530_sync_txdma_close(d, &sv11->chanA);
|
|
break;
|
|
}
|
|
return err;
|
|
}
|
|
sv11->chanA.rx_function = hostess_input;
|
|
|
|
/*
|
|
* Go go go
|
|
*/
|
|
|
|
netif_start_queue(d);
|
|
return 0;
|
|
}
|
|
|
|
static int hostess_close(struct net_device *d)
|
|
{
|
|
struct z8530_dev *sv11 = dev_to_sv(d);
|
|
/*
|
|
* Discard new frames
|
|
*/
|
|
sv11->chanA.rx_function = z8530_null_rx;
|
|
|
|
hdlc_close(d);
|
|
netif_stop_queue(d);
|
|
|
|
switch (dma) {
|
|
case 0:
|
|
z8530_sync_close(d, &sv11->chanA);
|
|
break;
|
|
case 1:
|
|
z8530_sync_dma_close(d, &sv11->chanA);
|
|
break;
|
|
case 2:
|
|
z8530_sync_txdma_close(d, &sv11->chanA);
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int hostess_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
|
|
{
|
|
/* struct z8530_dev *sv11=dev_to_sv(d);
|
|
z8530_ioctl(d,&sv11->chanA,ifr,cmd) */
|
|
return hdlc_ioctl(d, ifr, cmd);
|
|
}
|
|
|
|
/*
|
|
* Passed network frames, fire them downwind.
|
|
*/
|
|
|
|
static netdev_tx_t hostess_queue_xmit(struct sk_buff *skb,
|
|
struct net_device *d)
|
|
{
|
|
return z8530_queue_xmit(&dev_to_sv(d)->chanA, skb);
|
|
}
|
|
|
|
static int hostess_attach(struct net_device *dev, unsigned short encoding,
|
|
unsigned short parity)
|
|
{
|
|
if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
|
|
return 0;
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Description block for a Comtrol Hostess SV11 card
|
|
*/
|
|
|
|
static const struct net_device_ops hostess_ops = {
|
|
.ndo_open = hostess_open,
|
|
.ndo_stop = hostess_close,
|
|
.ndo_start_xmit = hdlc_start_xmit,
|
|
.ndo_do_ioctl = hostess_ioctl,
|
|
};
|
|
|
|
static struct z8530_dev *sv11_init(int iobase, int irq)
|
|
{
|
|
struct z8530_dev *sv;
|
|
struct net_device *netdev;
|
|
/*
|
|
* Get the needed I/O space
|
|
*/
|
|
|
|
if (!request_region(iobase, 8, "Comtrol SV11")) {
|
|
pr_warn("I/O 0x%X already in use\n", iobase);
|
|
return NULL;
|
|
}
|
|
|
|
sv = kzalloc(sizeof(struct z8530_dev), GFP_KERNEL);
|
|
if (!sv)
|
|
goto err_kzalloc;
|
|
|
|
/*
|
|
* Stuff in the I/O addressing
|
|
*/
|
|
|
|
sv->active = 0;
|
|
|
|
sv->chanA.ctrlio = iobase + 1;
|
|
sv->chanA.dataio = iobase + 3;
|
|
sv->chanB.ctrlio = -1;
|
|
sv->chanB.dataio = -1;
|
|
sv->chanA.irqs = &z8530_nop;
|
|
sv->chanB.irqs = &z8530_nop;
|
|
|
|
outb(0, iobase + 4); /* DMA off */
|
|
|
|
/* 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, 0,
|
|
"Hostess SV11", sv) < 0) {
|
|
pr_warn("IRQ %d already in use\n", irq);
|
|
goto err_irq;
|
|
}
|
|
|
|
sv->irq = irq;
|
|
sv->chanA.private = sv;
|
|
sv->chanA.dev = sv;
|
|
sv->chanB.dev = sv;
|
|
|
|
if (dma) {
|
|
/*
|
|
* You can have DMA off or 1 and 3 thats the lot
|
|
* on the Comtrol.
|
|
*/
|
|
sv->chanA.txdma = 3;
|
|
sv->chanA.rxdma = 1;
|
|
outb(0x03 | 0x08, iobase + 4); /* DMA on */
|
|
if (request_dma(sv->chanA.txdma, "Hostess SV/11 (TX)"))
|
|
goto err_txdma;
|
|
|
|
if (dma == 1)
|
|
if (request_dma(sv->chanA.rxdma, "Hostess SV/11 (RX)"))
|
|
goto err_rxdma;
|
|
}
|
|
|
|
/* Kill our private IRQ line the hostess can end up chattering
|
|
until the configuration is set */
|
|
disable_irq(irq);
|
|
|
|
/*
|
|
* Begin normal initialise
|
|
*/
|
|
|
|
if (z8530_init(sv)) {
|
|
pr_err("Z8530 series device not found\n");
|
|
enable_irq(irq);
|
|
goto free_dma;
|
|
}
|
|
z8530_channel_load(&sv->chanB, z8530_dead_port);
|
|
if (sv->type == Z85C30)
|
|
z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream);
|
|
else
|
|
z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream_85230);
|
|
|
|
enable_irq(irq);
|
|
|
|
/*
|
|
* Now we can take the IRQ
|
|
*/
|
|
|
|
sv->chanA.netdevice = netdev = alloc_hdlcdev(sv);
|
|
if (!netdev)
|
|
goto free_dma;
|
|
|
|
dev_to_hdlc(netdev)->attach = hostess_attach;
|
|
dev_to_hdlc(netdev)->xmit = hostess_queue_xmit;
|
|
netdev->netdev_ops = &hostess_ops;
|
|
netdev->base_addr = iobase;
|
|
netdev->irq = irq;
|
|
|
|
if (register_hdlc_device(netdev)) {
|
|
pr_err("unable to register HDLC device\n");
|
|
free_netdev(netdev);
|
|
goto free_dma;
|
|
}
|
|
|
|
z8530_describe(sv, "I/O", iobase);
|
|
sv->active = 1;
|
|
return sv;
|
|
|
|
free_dma:
|
|
if (dma == 1)
|
|
free_dma(sv->chanA.rxdma);
|
|
err_rxdma:
|
|
if (dma)
|
|
free_dma(sv->chanA.txdma);
|
|
err_txdma:
|
|
free_irq(irq, sv);
|
|
err_irq:
|
|
kfree(sv);
|
|
err_kzalloc:
|
|
release_region(iobase, 8);
|
|
return NULL;
|
|
}
|
|
|
|
static void sv11_shutdown(struct z8530_dev *dev)
|
|
{
|
|
unregister_hdlc_device(dev->chanA.netdevice);
|
|
z8530_shutdown(dev);
|
|
free_irq(dev->irq, dev);
|
|
if (dma) {
|
|
if (dma == 1)
|
|
free_dma(dev->chanA.rxdma);
|
|
free_dma(dev->chanA.txdma);
|
|
}
|
|
release_region(dev->chanA.ctrlio - 1, 8);
|
|
free_netdev(dev->chanA.netdevice);
|
|
kfree(dev);
|
|
}
|
|
|
|
static int io = 0x200;
|
|
static int irq = 9;
|
|
|
|
module_param_hw(io, int, ioport, 0);
|
|
MODULE_PARM_DESC(io, "The I/O base of the Comtrol Hostess SV11 card");
|
|
module_param_hw(dma, int, dma, 0);
|
|
MODULE_PARM_DESC(dma, "Set this to 1 to use DMA1/DMA3 for TX/RX");
|
|
module_param_hw(irq, int, irq, 0);
|
|
MODULE_PARM_DESC(irq, "The interrupt line setting for the Comtrol Hostess SV11 card");
|
|
|
|
MODULE_AUTHOR("Alan Cox");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Modular driver for the Comtrol Hostess SV11");
|
|
|
|
static struct z8530_dev *sv11_unit;
|
|
|
|
int init_module(void)
|
|
{
|
|
if ((sv11_unit = sv11_init(io, irq)) == NULL)
|
|
return -ENODEV;
|
|
return 0;
|
|
}
|
|
|
|
void cleanup_module(void)
|
|
{
|
|
if (sv11_unit)
|
|
sv11_shutdown(sv11_unit);
|
|
}
|