2 * Comtrol SV11 card driver
4 * This is a slightly odd Z85230 synchronous driver. All you need to
9 * It supports DMA using two DMA channels in SYNC mode. The driver doesn't
10 * use these facilities
12 * The control port is at io+1, the data at io+3 and turning off the DMA
13 * is done by writing 0 to io+4
15 * The hardware does the bus handling to avoid the need for delays between
16 * touching control registers.
18 * Port B isn't wired (why - beats me)
20 * Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl>
23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
25 #include <linux/module.h>
26 #include <linux/kernel.h>
28 #include <linux/net.h>
29 #include <linux/skbuff.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/delay.h>
33 #include <linux/hdlc.h>
34 #include <linux/ioport.h>
35 #include <linux/slab.h>
41 #include <asm/byteorder.h>
47 * Network driver support routines
50 static inline struct z8530_dev* dev_to_sv(struct net_device *dev)
52 return (struct z8530_dev *)dev_to_hdlc(dev)->priv;
56 * Frame receive. Simple for our card as we do HDLC and there
57 * is no funny garbage involved
60 static void hostess_input(struct z8530_channel *c, struct sk_buff *skb)
62 /* Drop the CRC - it's not a good idea to try and negotiate it ;) */
63 skb_trim(skb, skb->len - 2);
64 skb->protocol = hdlc_type_trans(skb, c->netdevice);
65 skb_reset_mac_header(skb);
66 skb->dev = c->netdevice;
68 * Send it to the PPP layer. We don't have time to process
75 * We've been placed in the UP state
78 static int hostess_open(struct net_device *d)
80 struct z8530_dev *sv11 = dev_to_sv(d);
88 err = z8530_sync_open(d, &sv11->chanA);
91 err = z8530_sync_dma_open(d, &sv11->chanA);
94 err = z8530_sync_txdma_open(d, &sv11->chanA);
105 z8530_sync_close(d, &sv11->chanA);
108 z8530_sync_dma_close(d, &sv11->chanA);
111 z8530_sync_txdma_close(d, &sv11->chanA);
116 sv11->chanA.rx_function = hostess_input;
122 netif_start_queue(d);
126 static int hostess_close(struct net_device *d)
128 struct z8530_dev *sv11 = dev_to_sv(d);
132 sv11->chanA.rx_function = z8530_null_rx;
139 z8530_sync_close(d, &sv11->chanA);
142 z8530_sync_dma_close(d, &sv11->chanA);
145 z8530_sync_txdma_close(d, &sv11->chanA);
151 static int hostess_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
153 /* struct z8530_dev *sv11=dev_to_sv(d);
154 z8530_ioctl(d,&sv11->chanA,ifr,cmd) */
155 return hdlc_ioctl(d, ifr, cmd);
159 * Passed network frames, fire them downwind.
162 static netdev_tx_t hostess_queue_xmit(struct sk_buff *skb,
163 struct net_device *d)
165 return z8530_queue_xmit(&dev_to_sv(d)->chanA, skb);
168 static int hostess_attach(struct net_device *dev, unsigned short encoding,
169 unsigned short parity)
171 if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
177 * Description block for a Comtrol Hostess SV11 card
180 static const struct net_device_ops hostess_ops = {
181 .ndo_open = hostess_open,
182 .ndo_stop = hostess_close,
183 .ndo_change_mtu = hdlc_change_mtu,
184 .ndo_start_xmit = hdlc_start_xmit,
185 .ndo_do_ioctl = hostess_ioctl,
188 static struct z8530_dev *sv11_init(int iobase, int irq)
190 struct z8530_dev *sv;
191 struct net_device *netdev;
193 * Get the needed I/O space
196 if (!request_region(iobase, 8, "Comtrol SV11")) {
197 pr_warn("I/O 0x%X already in use\n", iobase);
201 sv = kzalloc(sizeof(struct z8530_dev), GFP_KERNEL);
206 * Stuff in the I/O addressing
211 sv->chanA.ctrlio = iobase + 1;
212 sv->chanA.dataio = iobase + 3;
213 sv->chanB.ctrlio = -1;
214 sv->chanB.dataio = -1;
215 sv->chanA.irqs = &z8530_nop;
216 sv->chanB.irqs = &z8530_nop;
218 outb(0, iobase + 4); /* DMA off */
220 /* We want a fast IRQ for this device. Actually we'd like an even faster
221 IRQ ;) - This is one driver RtLinux is made for */
223 if (request_irq(irq, z8530_interrupt, 0,
224 "Hostess SV11", sv) < 0) {
225 pr_warn("IRQ %d already in use\n", irq);
230 sv->chanA.private = sv;
236 * You can have DMA off or 1 and 3 thats the lot
241 outb(0x03 | 0x08, iobase + 4); /* DMA on */
242 if (request_dma(sv->chanA.txdma, "Hostess SV/11 (TX)"))
246 if (request_dma(sv->chanA.rxdma, "Hostess SV/11 (RX)"))
250 /* Kill our private IRQ line the hostess can end up chattering
251 until the configuration is set */
255 * Begin normal initialise
258 if (z8530_init(sv)) {
259 pr_err("Z8530 series device not found\n");
263 z8530_channel_load(&sv->chanB, z8530_dead_port);
264 if (sv->type == Z85C30)
265 z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream);
267 z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream_85230);
272 * Now we can take the IRQ
275 sv->chanA.netdevice = netdev = alloc_hdlcdev(sv);
279 dev_to_hdlc(netdev)->attach = hostess_attach;
280 dev_to_hdlc(netdev)->xmit = hostess_queue_xmit;
281 netdev->netdev_ops = &hostess_ops;
282 netdev->base_addr = iobase;
285 if (register_hdlc_device(netdev)) {
286 pr_err("unable to register HDLC device\n");
291 z8530_describe(sv, "I/O", iobase);
297 free_dma(sv->chanA.rxdma);
300 free_dma(sv->chanA.txdma);
306 release_region(iobase, 8);
310 static void sv11_shutdown(struct z8530_dev *dev)
312 unregister_hdlc_device(dev->chanA.netdevice);
314 free_irq(dev->irq, dev);
317 free_dma(dev->chanA.rxdma);
318 free_dma(dev->chanA.txdma);
320 release_region(dev->chanA.ctrlio - 1, 8);
321 free_netdev(dev->chanA.netdevice);
325 static int io = 0x200;
328 module_param(io, int, 0);
329 MODULE_PARM_DESC(io, "The I/O base of the Comtrol Hostess SV11 card");
330 module_param(dma, int, 0);
331 MODULE_PARM_DESC(dma, "Set this to 1 to use DMA1/DMA3 for TX/RX");
332 module_param(irq, int, 0);
333 MODULE_PARM_DESC(irq, "The interrupt line setting for the Comtrol Hostess SV11 card");
335 MODULE_AUTHOR("Alan Cox");
336 MODULE_LICENSE("GPL");
337 MODULE_DESCRIPTION("Modular driver for the Comtrol Hostess SV11");
339 static struct z8530_dev *sv11_unit;
341 int init_module(void)
343 if ((sv11_unit = sv11_init(io, irq)) == NULL)
348 void cleanup_module(void)
351 sv11_shutdown(sv11_unit);