2 * Sealevel Systems 4021 driver.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * (c) Copyright 1999, 2001 Alan Cox
10 * (c) Copyright 2001 Red Hat Inc.
11 * Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl>
15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17 #include <linux/module.h>
18 #include <linux/kernel.h>
20 #include <linux/net.h>
21 #include <linux/skbuff.h>
22 #include <linux/netdevice.h>
23 #include <linux/if_arp.h>
24 #include <linux/delay.h>
25 #include <linux/hdlc.h>
26 #include <linux/ioport.h>
27 #include <linux/init.h>
28 #include <linux/slab.h>
34 #include <asm/byteorder.h>
40 struct z8530_channel *chan;
47 struct slvl_device dev[2];
48 struct z8530_dev board;
53 * Network driver support routines
56 static inline struct slvl_device* dev_to_chan(struct net_device *dev)
58 return (struct slvl_device *)dev_to_hdlc(dev)->priv;
62 * Frame receive. Simple for our card as we do HDLC and there
63 * is no funny garbage involved
66 static void sealevel_input(struct z8530_channel *c, struct sk_buff *skb)
68 /* Drop the CRC - it's not a good idea to try and negotiate it ;) */
69 skb_trim(skb, skb->len - 2);
70 skb->protocol = hdlc_type_trans(skb, c->netdevice);
71 skb_reset_mac_header(skb);
72 skb->dev = c->netdevice;
77 * We've been placed in the UP state
80 static int sealevel_open(struct net_device *d)
82 struct slvl_device *slvl = dev_to_chan(d);
84 int unit = slvl->channel;
92 err = z8530_sync_dma_open(d, slvl->chan);
95 err = z8530_sync_open(d, slvl->chan);
106 z8530_sync_dma_close(d, slvl->chan);
109 z8530_sync_close(d, slvl->chan);
115 slvl->chan->rx_function = sealevel_input;
120 netif_start_queue(d);
124 static int sealevel_close(struct net_device *d)
126 struct slvl_device *slvl = dev_to_chan(d);
127 int unit = slvl->channel;
133 slvl->chan->rx_function = z8530_null_rx;
140 z8530_sync_dma_close(d, slvl->chan);
143 z8530_sync_close(d, slvl->chan);
149 static int sealevel_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
151 /* struct slvl_device *slvl=dev_to_chan(d);
152 z8530_ioctl(d,&slvl->sync.chanA,ifr,cmd) */
153 return hdlc_ioctl(d, ifr, cmd);
157 * Passed network frames, fire them downwind.
160 static netdev_tx_t sealevel_queue_xmit(struct sk_buff *skb,
161 struct net_device *d)
163 return z8530_queue_xmit(dev_to_chan(d)->chan, skb);
166 static int sealevel_attach(struct net_device *dev, unsigned short encoding,
167 unsigned short parity)
169 if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
174 static const struct net_device_ops sealevel_ops = {
175 .ndo_open = sealevel_open,
176 .ndo_stop = sealevel_close,
177 .ndo_change_mtu = hdlc_change_mtu,
178 .ndo_start_xmit = hdlc_start_xmit,
179 .ndo_do_ioctl = sealevel_ioctl,
182 static int slvl_setup(struct slvl_device *sv, int iobase, int irq)
184 struct net_device *dev = alloc_hdlcdev(sv);
188 dev_to_hdlc(dev)->attach = sealevel_attach;
189 dev_to_hdlc(dev)->xmit = sealevel_queue_xmit;
190 dev->netdev_ops = &sealevel_ops;
191 dev->base_addr = iobase;
194 if (register_hdlc_device(dev)) {
195 pr_err("unable to register HDLC device\n");
200 sv->chan->netdevice = dev;
206 * Allocate and setup Sealevel board.
209 static __init struct slvl_board *slvl_init(int iobase, int irq,
210 int txdma, int rxdma, int slow)
212 struct z8530_dev *dev;
213 struct slvl_board *b;
216 * Get the needed I/O space
219 if (!request_region(iobase, 8, "Sealevel 4021")) {
220 pr_warn("I/O 0x%X already in use\n", iobase);
224 b = kzalloc(sizeof(struct slvl_board), GFP_KERNEL);
228 b->dev[0].chan = &b->board.chanA;
229 b->dev[0].channel = 0;
231 b->dev[1].chan = &b->board.chanB;
232 b->dev[1].channel = 1;
237 * Stuff in the I/O addressing
245 * Select 8530 delays for the old board
249 iobase |= Z8530_PORT_SLEEP;
251 dev->chanA.ctrlio = iobase + 1;
252 dev->chanA.dataio = iobase;
253 dev->chanB.ctrlio = iobase + 3;
254 dev->chanB.dataio = iobase + 2;
256 dev->chanA.irqs = &z8530_nop;
257 dev->chanB.irqs = &z8530_nop;
260 * Assert DTR enable DMA
263 outb(3 | (1 << 7), b->iobase + 4);
266 /* We want a fast IRQ for this device. Actually we'd like an even faster
267 IRQ ;) - This is one driver RtLinux is made for */
269 if (request_irq(irq, z8530_interrupt, 0,
270 "SeaLevel", dev) < 0) {
271 pr_warn("IRQ %d already in use\n", irq);
272 goto err_request_irq;
276 dev->chanA.private = &b->dev[0];
277 dev->chanB.private = &b->dev[1];
278 dev->chanA.dev = dev;
279 dev->chanB.dev = dev;
281 dev->chanA.txdma = 3;
282 dev->chanA.rxdma = 1;
283 if (request_dma(dev->chanA.txdma, "SeaLevel (TX)"))
286 if (request_dma(dev->chanA.rxdma, "SeaLevel (RX)"))
292 * Begin normal initialise
295 if (z8530_init(dev) != 0) {
296 pr_err("Z8530 series device not found\n");
300 if (dev->type == Z85C30) {
301 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream);
302 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream);
304 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream_85230);
305 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream_85230);
309 * Now we can take the IRQ
314 if (slvl_setup(&b->dev[0], iobase, irq))
316 if (slvl_setup(&b->dev[1], iobase, irq))
319 z8530_describe(dev, "I/O", iobase);
324 unregister_hdlc_device(b->dev[0].chan->netdevice);
325 free_netdev(b->dev[0].chan->netdevice);
327 free_dma(dev->chanA.rxdma);
329 free_dma(dev->chanA.txdma);
335 release_region(iobase, 8);
339 static void __exit slvl_shutdown(struct slvl_board *b)
343 z8530_shutdown(&b->board);
345 for (u = 0; u < 2; u++) {
346 struct net_device *d = b->dev[u].chan->netdevice;
347 unregister_hdlc_device(d);
351 free_irq(b->board.irq, &b->board);
352 free_dma(b->board.chanA.rxdma);
353 free_dma(b->board.chanA.txdma);
354 /* DMA off on the card, drop DTR */
356 release_region(b->iobase, 8);
365 static bool slow=false;
367 module_param(io, int, 0);
368 MODULE_PARM_DESC(io, "The I/O base of the Sealevel card");
369 module_param(txdma, int, 0);
370 MODULE_PARM_DESC(txdma, "Transmit DMA channel");
371 module_param(rxdma, int, 0);
372 MODULE_PARM_DESC(rxdma, "Receive DMA channel");
373 module_param(irq, int, 0);
374 MODULE_PARM_DESC(irq, "The interrupt line setting for the SeaLevel card");
375 module_param(slow, bool, 0);
376 MODULE_PARM_DESC(slow, "Set this for an older Sealevel card such as the 4012");
378 MODULE_AUTHOR("Alan Cox");
379 MODULE_LICENSE("GPL");
380 MODULE_DESCRIPTION("Modular driver for the SeaLevel 4021");
382 static struct slvl_board *slvl_unit;
384 static int __init slvl_init_module(void)
386 slvl_unit = slvl_init(io, irq, txdma, rxdma, slow);
388 return slvl_unit ? 0 : -ENODEV;
391 static void __exit slvl_cleanup_module(void)
394 slvl_shutdown(slvl_unit);
397 module_init(slvl_init_module);
398 module_exit(slvl_cleanup_module);