/*
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* Sealevel Systems 4021 driver.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* (c) Copyright 1999, 2001 Alan Cox
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* (c) Copyright 2001 Red Hat Inc.
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* Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl>
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*
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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/init.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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struct slvl_device
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{
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struct z8530_channel *chan;
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int channel;
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};
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struct slvl_board
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{
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struct slvl_device dev[2];
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struct z8530_dev board;
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int iobase;
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};
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/*
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* Network driver support routines
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*/
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static inline struct slvl_device* dev_to_chan(struct net_device *dev)
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{
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return (struct slvl_device *)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 sealevel_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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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 sealevel_open(struct net_device *d)
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{
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struct slvl_device *slvl = dev_to_chan(d);
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int err = -1;
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int unit = slvl->channel;
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/*
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* Link layer up.
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*/
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switch (unit) {
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case 0:
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err = z8530_sync_dma_open(d, slvl->chan);
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break;
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case 1:
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err = z8530_sync_open(d, slvl->chan);
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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 (unit) {
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case 0:
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z8530_sync_dma_close(d, slvl->chan);
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break;
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case 1:
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z8530_sync_close(d, slvl->chan);
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break;
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}
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return err;
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}
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slvl->chan->rx_function = sealevel_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 sealevel_close(struct net_device *d)
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{
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struct slvl_device *slvl = dev_to_chan(d);
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int unit = slvl->channel;
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/*
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* Discard new frames
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*/
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slvl->chan->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 (unit) {
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case 0:
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z8530_sync_dma_close(d, slvl->chan);
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break;
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case 1:
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z8530_sync_close(d, slvl->chan);
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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 sealevel_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
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{
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/* struct slvl_device *slvl=dev_to_chan(d);
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z8530_ioctl(d,&slvl->sync.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 sealevel_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_chan(d)->chan, skb);
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}
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static int sealevel_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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static const struct net_device_ops sealevel_ops = {
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.ndo_open = sealevel_open,
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.ndo_stop = sealevel_close,
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.ndo_start_xmit = hdlc_start_xmit,
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.ndo_do_ioctl = sealevel_ioctl,
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};
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static int slvl_setup(struct slvl_device *sv, int iobase, int irq)
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{
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struct net_device *dev = alloc_hdlcdev(sv);
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if (!dev)
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return -1;
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dev_to_hdlc(dev)->attach = sealevel_attach;
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dev_to_hdlc(dev)->xmit = sealevel_queue_xmit;
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dev->netdev_ops = &sealevel_ops;
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dev->base_addr = iobase;
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dev->irq = irq;
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if (register_hdlc_device(dev)) {
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pr_err("unable to register HDLC device\n");
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free_netdev(dev);
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return -1;
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}
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sv->chan->netdevice = dev;
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return 0;
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}
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/*
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* Allocate and setup Sealevel board.
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*/
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static __init struct slvl_board *slvl_init(int iobase, int irq,
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int txdma, int rxdma, int slow)
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{
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struct z8530_dev *dev;
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struct slvl_board *b;
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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, "Sealevel 4021")) {
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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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b = kzalloc(sizeof(struct slvl_board), GFP_KERNEL);
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if (!b)
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goto err_kzalloc;
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b->dev[0].chan = &b->board.chanA;
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b->dev[0].channel = 0;
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b->dev[1].chan = &b->board.chanB;
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b->dev[1].channel = 1;
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dev = &b->board;
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/*
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* Stuff in the I/O addressing
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*/
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dev->active = 0;
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b->iobase = iobase;
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/*
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* Select 8530 delays for the old board
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*/
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if (slow)
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iobase |= Z8530_PORT_SLEEP;
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dev->chanA.ctrlio = iobase + 1;
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dev->chanA.dataio = iobase;
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dev->chanB.ctrlio = iobase + 3;
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dev->chanB.dataio = iobase + 2;
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dev->chanA.irqs = &z8530_nop;
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dev->chanB.irqs = &z8530_nop;
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/*
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* Assert DTR enable DMA
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*/
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outb(3 | (1 << 7), b->iobase + 4);
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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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"SeaLevel", dev) < 0) {
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pr_warn("IRQ %d already in use\n", irq);
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goto err_request_irq;
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}
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dev->irq = irq;
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dev->chanA.private = &b->dev[0];
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dev->chanB.private = &b->dev[1];
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dev->chanA.dev = dev;
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dev->chanB.dev = dev;
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dev->chanA.txdma = 3;
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dev->chanA.rxdma = 1;
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if (request_dma(dev->chanA.txdma, "SeaLevel (TX)"))
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goto err_dma_tx;
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if (request_dma(dev->chanA.rxdma, "SeaLevel (RX)"))
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goto err_dma_rx;
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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(dev) != 0) {
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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_hw;
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}
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if (dev->type == Z85C30) {
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z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream);
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z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream);
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} else {
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z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream_85230);
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z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream_85230);
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}
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/*
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* Now we can take the IRQ
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*/
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enable_irq(irq);
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if (slvl_setup(&b->dev[0], iobase, irq))
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goto free_hw;
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if (slvl_setup(&b->dev[1], iobase, irq))
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goto free_netdev0;
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z8530_describe(dev, "I/O", iobase);
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dev->active = 1;
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return b;
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free_netdev0:
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unregister_hdlc_device(b->dev[0].chan->netdevice);
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free_netdev(b->dev[0].chan->netdevice);
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free_hw:
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free_dma(dev->chanA.rxdma);
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err_dma_rx:
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free_dma(dev->chanA.txdma);
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err_dma_tx:
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free_irq(irq, dev);
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err_request_irq:
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kfree(b);
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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 __exit slvl_shutdown(struct slvl_board *b)
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{
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int u;
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z8530_shutdown(&b->board);
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for (u = 0; u < 2; u++) {
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struct net_device *d = b->dev[u].chan->netdevice;
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unregister_hdlc_device(d);
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free_netdev(d);
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}
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free_irq(b->board.irq, &b->board);
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free_dma(b->board.chanA.rxdma);
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free_dma(b->board.chanA.txdma);
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/* DMA off on the card, drop DTR */
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outb(0, b->iobase);
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release_region(b->iobase, 8);
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kfree(b);
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}
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static int io=0x238;
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static int txdma=1;
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static int rxdma=3;
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static int irq=5;
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static bool slow=false;
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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 Sealevel card");
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module_param_hw(txdma, int, dma, 0);
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MODULE_PARM_DESC(txdma, "Transmit DMA channel");
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module_param_hw(rxdma, int, dma, 0);
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MODULE_PARM_DESC(rxdma, "Receive DMA channel");
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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 SeaLevel card");
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module_param(slow, bool, 0);
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MODULE_PARM_DESC(slow, "Set this for an older Sealevel card such as the 4012");
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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 SeaLevel 4021");
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static struct slvl_board *slvl_unit;
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static int __init slvl_init_module(void)
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{
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slvl_unit = slvl_init(io, irq, txdma, rxdma, slow);
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return slvl_unit ? 0 : -ENODEV;
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}
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static void __exit slvl_cleanup_module(void)
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{
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if (slvl_unit)
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slvl_shutdown(slvl_unit);
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}
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module_init(slvl_init_module);
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module_exit(slvl_cleanup_module);
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