linux/drivers/net/wan/hostess_sv11.c
<<
>>
Prefs
   1/*
   2 *      Comtrol SV11 card driver
   3 *
   4 *      This is a slightly odd Z85230 synchronous driver. All you need to
   5 *      know basically is
   6 *
   7 *      Its a genuine Z85230
   8 *
   9 *      It supports DMA using two DMA channels in SYNC mode. The driver doesn't
  10 *      use these facilities
  11 *      
  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
  14 *
  15 *      The hardware does the bus handling to avoid the need for delays between
  16 *      touching control registers.
  17 *
  18 *      Port B isn't wired (why - beats me)
  19 *
  20 *      Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl>
  21 */
  22
  23#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  24
  25#include <linux/module.h>
  26#include <linux/kernel.h>
  27#include <linux/mm.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>
  36#include <net/arp.h>
  37
  38#include <asm/irq.h>
  39#include <asm/io.h>
  40#include <asm/dma.h>
  41#include <asm/byteorder.h>
  42#include "z85230.h"
  43
  44static int dma;
  45
  46/*
  47 *      Network driver support routines
  48 */
  49
  50static inline struct z8530_dev* dev_to_sv(struct net_device *dev)
  51{
  52        return (struct z8530_dev *)dev_to_hdlc(dev)->priv;
  53}
  54
  55/*
  56 *      Frame receive. Simple for our card as we do HDLC and there
  57 *      is no funny garbage involved
  58 */
  59
  60static void hostess_input(struct z8530_channel *c, struct sk_buff *skb)
  61{
  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;
  67        /*
  68         *      Send it to the PPP layer. We don't have time to process
  69         *      it right now.
  70         */
  71        netif_rx(skb);
  72}
  73
  74/*
  75 *      We've been placed in the UP state
  76 */
  77
  78static int hostess_open(struct net_device *d)
  79{
  80        struct z8530_dev *sv11 = dev_to_sv(d);
  81        int err = -1;
  82
  83        /*
  84         *      Link layer up
  85         */
  86        switch (dma) {
  87                case 0:
  88                        err = z8530_sync_open(d, &sv11->chanA);
  89                        break;
  90                case 1:
  91                        err = z8530_sync_dma_open(d, &sv11->chanA);
  92                        break;
  93                case 2:
  94                        err = z8530_sync_txdma_open(d, &sv11->chanA);
  95                        break;
  96        }
  97
  98        if (err)
  99                return err;
 100
 101        err = hdlc_open(d);
 102        if (err) {
 103                switch (dma) {
 104                        case 0:
 105                                z8530_sync_close(d, &sv11->chanA);
 106                                break;
 107                        case 1:
 108                                z8530_sync_dma_close(d, &sv11->chanA);
 109                                break;
 110                        case 2:
 111                                z8530_sync_txdma_close(d, &sv11->chanA);
 112                                break;
 113                }
 114                return err;
 115        }
 116        sv11->chanA.rx_function = hostess_input;
 117
 118        /*
 119         *      Go go go
 120         */
 121
 122        netif_start_queue(d);
 123        return 0;
 124}
 125
 126static int hostess_close(struct net_device *d)
 127{
 128        struct z8530_dev *sv11 = dev_to_sv(d);
 129        /*
 130         *      Discard new frames
 131         */
 132        sv11->chanA.rx_function = z8530_null_rx;
 133
 134        hdlc_close(d);
 135        netif_stop_queue(d);
 136
 137        switch (dma) {
 138                case 0:
 139                        z8530_sync_close(d, &sv11->chanA);
 140                        break;
 141                case 1:
 142                        z8530_sync_dma_close(d, &sv11->chanA);
 143                        break;
 144                case 2:
 145                        z8530_sync_txdma_close(d, &sv11->chanA);
 146                        break;
 147        }
 148        return 0;
 149}
 150
 151static int hostess_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
 152{
 153        /* struct z8530_dev *sv11=dev_to_sv(d);
 154           z8530_ioctl(d,&sv11->chanA,ifr,cmd) */
 155        return hdlc_ioctl(d, ifr, cmd);
 156}
 157
 158/*
 159 *      Passed network frames, fire them downwind.
 160 */
 161
 162static netdev_tx_t hostess_queue_xmit(struct sk_buff *skb,
 163                                            struct net_device *d)
 164{
 165        return z8530_queue_xmit(&dev_to_sv(d)->chanA, skb);
 166}
 167
 168static int hostess_attach(struct net_device *dev, unsigned short encoding,
 169                          unsigned short parity)
 170{
 171        if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
 172                return 0;
 173        return -EINVAL;
 174}
 175
 176/*
 177 *      Description block for a Comtrol Hostess SV11 card
 178 */
 179
 180static 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,
 186};
 187
 188static struct z8530_dev *sv11_init(int iobase, int irq)
 189{
 190        struct z8530_dev *sv;
 191        struct net_device *netdev;
 192        /*
 193         *      Get the needed I/O space
 194         */
 195
 196        if (!request_region(iobase, 8, "Comtrol SV11")) {
 197                pr_warn("I/O 0x%X already in use\n", iobase);
 198                return NULL;
 199        }
 200
 201        sv = kzalloc(sizeof(struct z8530_dev), GFP_KERNEL);
 202        if (!sv)
 203                goto err_kzalloc;
 204
 205        /*
 206         *      Stuff in the I/O addressing
 207         */
 208
 209        sv->active = 0;
 210
 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;
 217
 218        outb(0, iobase + 4);            /* DMA off */
 219
 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 */
 222
 223        if (request_irq(irq, z8530_interrupt, IRQF_DISABLED,
 224                        "Hostess SV11", sv) < 0) {
 225                pr_warn("IRQ %d already in use\n", irq);
 226                goto err_irq;
 227        }
 228
 229        sv->irq = irq;
 230        sv->chanA.private = sv;
 231        sv->chanA.dev = sv;
 232        sv->chanB.dev = sv;
 233
 234        if (dma) {
 235                /*
 236                 *      You can have DMA off or 1 and 3 thats the lot
 237                 *      on the Comtrol.
 238                 */
 239                sv->chanA.txdma = 3;
 240                sv->chanA.rxdma = 1;
 241                outb(0x03 | 0x08, iobase + 4);          /* DMA on */
 242                if (request_dma(sv->chanA.txdma, "Hostess SV/11 (TX)"))
 243                        goto err_txdma;
 244
 245                if (dma == 1)
 246                        if (request_dma(sv->chanA.rxdma, "Hostess SV/11 (RX)"))
 247                                goto err_rxdma;
 248        }
 249
 250        /* Kill our private IRQ line the hostess can end up chattering
 251           until the configuration is set */
 252        disable_irq(irq);
 253
 254        /*
 255         *      Begin normal initialise
 256         */
 257
 258        if (z8530_init(sv)) {
 259                pr_err("Z8530 series device not found\n");
 260                enable_irq(irq);
 261                goto free_dma;
 262        }
 263        z8530_channel_load(&sv->chanB, z8530_dead_port);
 264        if (sv->type == Z85C30)
 265                z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream);
 266        else
 267                z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream_85230);
 268
 269        enable_irq(irq);
 270
 271        /*
 272         *      Now we can take the IRQ
 273         */
 274
 275        sv->chanA.netdevice = netdev = alloc_hdlcdev(sv);
 276        if (!netdev)
 277                goto free_dma;
 278
 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;
 283        netdev->irq = irq;
 284
 285        if (register_hdlc_device(netdev)) {
 286                pr_err("unable to register HDLC device\n");
 287                free_netdev(netdev);
 288                goto free_dma;
 289        }
 290
 291        z8530_describe(sv, "I/O", iobase);
 292        sv->active = 1;
 293        return sv;
 294
 295free_dma:
 296        if (dma == 1)
 297                free_dma(sv->chanA.rxdma);
 298err_rxdma:
 299        if (dma)
 300                free_dma(sv->chanA.txdma);
 301err_txdma:
 302        free_irq(irq, sv);
 303err_irq:
 304        kfree(sv);
 305err_kzalloc:
 306        release_region(iobase, 8);
 307        return NULL;
 308}
 309
 310static void sv11_shutdown(struct z8530_dev *dev)
 311{
 312        unregister_hdlc_device(dev->chanA.netdevice);
 313        z8530_shutdown(dev);
 314        free_irq(dev->irq, dev);
 315        if (dma) {
 316                if (dma == 1)
 317                        free_dma(dev->chanA.rxdma);
 318                free_dma(dev->chanA.txdma);
 319        }
 320        release_region(dev->chanA.ctrlio - 1, 8);
 321        free_netdev(dev->chanA.netdevice);
 322        kfree(dev);
 323}
 324
 325static int io = 0x200;
 326static int irq = 9;
 327
 328module_param(io, int, 0);
 329MODULE_PARM_DESC(io, "The I/O base of the Comtrol Hostess SV11 card");
 330module_param(dma, int, 0);
 331MODULE_PARM_DESC(dma, "Set this to 1 to use DMA1/DMA3 for TX/RX");
 332module_param(irq, int, 0);
 333MODULE_PARM_DESC(irq, "The interrupt line setting for the Comtrol Hostess SV11 card");
 334
 335MODULE_AUTHOR("Alan Cox");
 336MODULE_LICENSE("GPL");
 337MODULE_DESCRIPTION("Modular driver for the Comtrol Hostess SV11");
 338
 339static struct z8530_dev *sv11_unit;
 340
 341int init_module(void)
 342{
 343        if ((sv11_unit = sv11_init(io, irq)) == NULL)
 344                return -ENODEV;
 345        return 0;
 346}
 347
 348void cleanup_module(void)
 349{
 350        if (sv11_unit)
 351                sv11_shutdown(sv11_unit);
 352}
 353
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.