352 lines
7.2 KiB
C
352 lines
7.2 KiB
C
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/*
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* Comtrol SV11 card driver
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*
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* This is a slightly odd Z85230 synchronous driver. All you need to
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* know basically is
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*
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* Its a genuine Z85230
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*
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* It supports DMA using two DMA channels in SYNC mode. The driver doesn't
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* use these facilities
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*
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* The control port is at io+1, the data at io+3 and turning off the DMA
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* is done by writing 0 to io+4
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*
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* The hardware does the bus handling to avoid the need for delays between
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* touching control registers.
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*
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* Port B isn't wired (why - beats me)
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*
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* Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/net.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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#include <linux/delay.h>
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#include <linux/hdlc.h>
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#include <linux/ioport.h>
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#include <linux/slab.h>
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#include <net/arp.h>
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#include <asm/irq.h>
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#include <asm/io.h>
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#include <asm/dma.h>
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#include <asm/byteorder.h>
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#include "z85230.h"
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static int dma;
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/*
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* Network driver support routines
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*/
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static inline struct z8530_dev* dev_to_sv(struct net_device *dev)
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{
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return (struct z8530_dev *)dev_to_hdlc(dev)->priv;
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}
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/*
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* Frame receive. Simple for our card as we do HDLC and there
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* is no funny garbage involved
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*/
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static void hostess_input(struct z8530_channel *c, struct sk_buff *skb)
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{
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/* Drop the CRC - it's not a good idea to try and negotiate it ;) */
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skb_trim(skb, skb->len - 2);
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skb->protocol = hdlc_type_trans(skb, c->netdevice);
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skb_reset_mac_header(skb);
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skb->dev = c->netdevice;
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/*
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* Send it to the PPP layer. We don't have time to process
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* it right now.
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*/
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netif_rx(skb);
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}
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/*
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* We've been placed in the UP state
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*/
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static int hostess_open(struct net_device *d)
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{
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struct z8530_dev *sv11 = dev_to_sv(d);
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int err = -1;
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/*
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* Link layer up
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*/
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switch (dma) {
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case 0:
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err = z8530_sync_open(d, &sv11->chanA);
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break;
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case 1:
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err = z8530_sync_dma_open(d, &sv11->chanA);
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break;
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case 2:
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err = z8530_sync_txdma_open(d, &sv11->chanA);
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break;
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}
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if (err)
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return err;
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err = hdlc_open(d);
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if (err) {
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switch (dma) {
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case 0:
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z8530_sync_close(d, &sv11->chanA);
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break;
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case 1:
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z8530_sync_dma_close(d, &sv11->chanA);
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break;
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case 2:
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z8530_sync_txdma_close(d, &sv11->chanA);
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break;
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}
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return err;
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}
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sv11->chanA.rx_function = hostess_input;
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/*
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* Go go go
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*/
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netif_start_queue(d);
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return 0;
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}
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static int hostess_close(struct net_device *d)
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{
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struct z8530_dev *sv11 = dev_to_sv(d);
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/*
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* Discard new frames
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*/
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sv11->chanA.rx_function = z8530_null_rx;
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hdlc_close(d);
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netif_stop_queue(d);
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switch (dma) {
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case 0:
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z8530_sync_close(d, &sv11->chanA);
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break;
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case 1:
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z8530_sync_dma_close(d, &sv11->chanA);
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break;
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case 2:
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z8530_sync_txdma_close(d, &sv11->chanA);
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break;
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}
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return 0;
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}
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static int hostess_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
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{
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/* struct z8530_dev *sv11=dev_to_sv(d);
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z8530_ioctl(d,&sv11->chanA,ifr,cmd) */
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return hdlc_ioctl(d, ifr, cmd);
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}
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/*
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* Passed network frames, fire them downwind.
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*/
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static netdev_tx_t hostess_queue_xmit(struct sk_buff *skb,
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struct net_device *d)
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{
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return z8530_queue_xmit(&dev_to_sv(d)->chanA, skb);
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}
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static int hostess_attach(struct net_device *dev, unsigned short encoding,
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unsigned short parity)
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{
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if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
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return 0;
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return -EINVAL;
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}
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/*
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* Description block for a Comtrol Hostess SV11 card
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*/
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static const struct net_device_ops hostess_ops = {
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.ndo_open = hostess_open,
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.ndo_stop = hostess_close,
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.ndo_start_xmit = hdlc_start_xmit,
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.ndo_do_ioctl = hostess_ioctl,
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};
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static struct z8530_dev *sv11_init(int iobase, int irq)
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{
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struct z8530_dev *sv;
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struct net_device *netdev;
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/*
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* Get the needed I/O space
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*/
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if (!request_region(iobase, 8, "Comtrol SV11")) {
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pr_warn("I/O 0x%X already in use\n", iobase);
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return NULL;
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}
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sv = kzalloc(sizeof(struct z8530_dev), GFP_KERNEL);
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if (!sv)
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goto err_kzalloc;
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/*
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* Stuff in the I/O addressing
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*/
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sv->active = 0;
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sv->chanA.ctrlio = iobase + 1;
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sv->chanA.dataio = iobase + 3;
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sv->chanB.ctrlio = -1;
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sv->chanB.dataio = -1;
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sv->chanA.irqs = &z8530_nop;
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sv->chanB.irqs = &z8530_nop;
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outb(0, iobase + 4); /* DMA off */
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/* We want a fast IRQ for this device. Actually we'd like an even faster
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IRQ ;) - This is one driver RtLinux is made for */
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if (request_irq(irq, z8530_interrupt, 0,
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"Hostess SV11", sv) < 0) {
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pr_warn("IRQ %d already in use\n", irq);
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goto err_irq;
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}
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sv->irq = irq;
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sv->chanA.private = sv;
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sv->chanA.dev = sv;
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sv->chanB.dev = sv;
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if (dma) {
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/*
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* You can have DMA off or 1 and 3 thats the lot
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* on the Comtrol.
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*/
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sv->chanA.txdma = 3;
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sv->chanA.rxdma = 1;
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outb(0x03 | 0x08, iobase + 4); /* DMA on */
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if (request_dma(sv->chanA.txdma, "Hostess SV/11 (TX)"))
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goto err_txdma;
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if (dma == 1)
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if (request_dma(sv->chanA.rxdma, "Hostess SV/11 (RX)"))
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goto err_rxdma;
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}
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/* Kill our private IRQ line the hostess can end up chattering
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until the configuration is set */
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disable_irq(irq);
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/*
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* Begin normal initialise
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*/
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if (z8530_init(sv)) {
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pr_err("Z8530 series device not found\n");
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enable_irq(irq);
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goto free_dma;
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}
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z8530_channel_load(&sv->chanB, z8530_dead_port);
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if (sv->type == Z85C30)
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z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream);
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else
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z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream_85230);
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enable_irq(irq);
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/*
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* Now we can take the IRQ
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*/
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sv->chanA.netdevice = netdev = alloc_hdlcdev(sv);
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if (!netdev)
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goto free_dma;
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dev_to_hdlc(netdev)->attach = hostess_attach;
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dev_to_hdlc(netdev)->xmit = hostess_queue_xmit;
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netdev->netdev_ops = &hostess_ops;
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netdev->base_addr = iobase;
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netdev->irq = irq;
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if (register_hdlc_device(netdev)) {
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pr_err("unable to register HDLC device\n");
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free_netdev(netdev);
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goto free_dma;
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}
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z8530_describe(sv, "I/O", iobase);
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sv->active = 1;
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return sv;
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free_dma:
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if (dma == 1)
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free_dma(sv->chanA.rxdma);
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err_rxdma:
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if (dma)
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free_dma(sv->chanA.txdma);
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err_txdma:
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free_irq(irq, sv);
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err_irq:
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kfree(sv);
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err_kzalloc:
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release_region(iobase, 8);
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return NULL;
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}
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static void sv11_shutdown(struct z8530_dev *dev)
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{
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unregister_hdlc_device(dev->chanA.netdevice);
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z8530_shutdown(dev);
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free_irq(dev->irq, dev);
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if (dma) {
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if (dma == 1)
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free_dma(dev->chanA.rxdma);
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free_dma(dev->chanA.txdma);
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}
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release_region(dev->chanA.ctrlio - 1, 8);
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free_netdev(dev->chanA.netdevice);
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kfree(dev);
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}
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static int io = 0x200;
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static int irq = 9;
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module_param_hw(io, int, ioport, 0);
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MODULE_PARM_DESC(io, "The I/O base of the Comtrol Hostess SV11 card");
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module_param_hw(dma, int, dma, 0);
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MODULE_PARM_DESC(dma, "Set this to 1 to use DMA1/DMA3 for TX/RX");
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module_param_hw(irq, int, irq, 0);
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MODULE_PARM_DESC(irq, "The interrupt line setting for the Comtrol Hostess SV11 card");
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MODULE_AUTHOR("Alan Cox");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Modular driver for the Comtrol Hostess SV11");
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static struct z8530_dev *sv11_unit;
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int init_module(void)
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{
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if ((sv11_unit = sv11_init(io, irq)) == NULL)
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return -ENODEV;
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return 0;
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}
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void cleanup_module(void)
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{
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if (sv11_unit)
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sv11_shutdown(sv11_unit);
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}
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