drivers/net/wan/hostess_sv11.c

   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 isnt wired (why - beats me)
  19  *
  20  *      Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl>
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/kernel.h>
  25 #include <linux/mm.h>
  26 #include <linux/net.h>
  27 #include <linux/skbuff.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/if_arp.h>
  30 #include <linux/delay.h>
  31 #include <linux/hdlc.h>
  32 #include <linux/ioport.h>
  33 #include <net/arp.h>
  34
  35 #include <asm/irq.h>
  36 #include <asm/io.h>
  37 #include <asm/dma.h>
  38 #include <asm/byteorder.h>
  39 #include "z85230.h"
  40
  41 static int dma;
  42
  43 /*
  44  *      Network driver support routines
  45  */
  46
  47 static inline struct z8530_dev* dev_to_sv(struct net_device *dev)
  48 {
  49         return (struct z8530_dev *)dev_to_hdlc(dev)->priv;
  50 }
  51
  52 /*
  53  *      Frame receive. Simple for our card as we do HDLC and there
  54  *      is no funny garbage involved
  55  */
  56
  57 static void hostess_input(struct z8530_channel *c, struct sk_buff *skb)
  58 {
  59         /* Drop the CRC - it's not a good idea to try and negotiate it ;) */
  60         skb_trim(skb, skb->len - 2);
  61         skb->protocol = hdlc_type_trans(skb, c->netdevice);
  62         skb_reset_mac_header(skb);
  63         skb->dev = c->netdevice;
  64         /*
  65          *      Send it to the PPP layer. We don't have time to process
  66          *      it right now.
  67          */
  68         netif_rx(skb);
  69 }
  70
  71 /*
  72  *      We've been placed in the UP state
  73  */
  74
  75 static int hostess_open(struct net_device *d)
  76 {
  77         struct z8530_dev *sv11 = dev_to_sv(d);
  78         int err = -1;
  79
  80         /*
  81          *      Link layer up
  82          */
  83         switch (dma) {
  84                 case 0:
  85                         err = z8530_sync_open(d, &sv11->chanA);
  86                         break;
  87                 case 1:
  88                         err = z8530_sync_dma_open(d, &sv11->chanA);
  89                         break;
  90                 case 2:
  91                         err = z8530_sync_txdma_open(d, &sv11->chanA);
  92                         break;
  93         }
  94
  95         if (err)
  96                 return err;
  97
  98         err = hdlc_open(d);
  99         if (err) {
 100                 switch (dma) {
 101                         case 0:
 102                                 z8530_sync_close(d, &sv11->chanA);
 103                                 break;
 104                         case 1:
 105                                 z8530_sync_dma_close(d, &sv11->chanA);
 106                                 break;
 107                         case 2:
 108                                 z8530_sync_txdma_close(d, &sv11->chanA);
 109                                 break;
 110                 }
 111                 return err;
 112         }
 113         sv11->chanA.rx_function = hostess_input;
 114
 115         /*
 116          *      Go go go
 117          */
 118
 119         netif_start_queue(d);
 120         return 0;
 121 }
 122
 123 static int hostess_close(struct net_device *d)
 124 {
 125         struct z8530_dev *sv11 = dev_to_sv(d);
 126         /*
 127          *      Discard new frames
 128          */
 129         sv11->chanA.rx_function = z8530_null_rx;
 130
 131         hdlc_close(d);
 132         netif_stop_queue(d);
 133
 134         switch (dma) {
 135                 case 0:
 136                         z8530_sync_close(d, &sv11->chanA);
 137                         break;
 138                 case 1:
 139                         z8530_sync_dma_close(d, &sv11->chanA);
 140                         break;
 141                 case 2:
 142                         z8530_sync_txdma_close(d, &sv11->chanA);
 143                         break;
 144         }
 145         return 0;
 146 }
 147
 148 static int hostess_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
 149 {
 150         /* struct z8530_dev *sv11=dev_to_sv(d);
 151            z8530_ioctl(d,&sv11->chanA,ifr,cmd) */
 152         return hdlc_ioctl(d, ifr, cmd);
 153 }
 154
 155 /*
 156  *      Passed network frames, fire them downwind.
 157  */
 158
 159 static netdev_tx_t hostess_queue_xmit(struct sk_buff *skb,
 160                                             struct net_device *d)
 161 {
 162         return z8530_queue_xmit(&dev_to_sv(d)->chanA, skb);
 163 }
 164
 165 static int hostess_attach(struct net_device *dev, unsigned short encoding,
 166                           unsigned short parity)
 167 {
 168         if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
 169                 return 0;
 170         return -EINVAL;
 171 }
 172
 173 /*
 174  *      Description block for a Comtrol Hostess SV11 card
 175  */
 176
 177 static const struct net_device_ops hostess_ops = {
 178         .ndo_open       = hostess_open,
 179         .ndo_stop       = hostess_close,
 180         .ndo_change_mtu = hdlc_change_mtu,
 181         .ndo_start_xmit = hdlc_start_xmit,
 182         .ndo_do_ioctl   = hostess_ioctl,
 183 };
 184
 185 static struct z8530_dev *sv11_init(int iobase, int irq)
 186 {
 187         struct z8530_dev *sv;
 188         struct net_device *netdev;
 189         /*
 190          *      Get the needed I/O space
 191          */
 192
 193         if (!request_region(iobase, 8, "Comtrol SV11")) {
 194                 printk(KERN_WARNING "hostess: I/O 0x%X already in use.\n",
 195                        iobase);
 196                 return NULL;
 197         }
 198
 199         sv = kzalloc(sizeof(struct z8530_dev), GFP_KERNEL);
 200         if (!sv)
 201                 goto err_kzalloc;
 202
 203         /*
 204          *      Stuff in the I/O addressing
 205          */
 206
 207         sv->active = 0;
 208
 209         sv->chanA.ctrlio = iobase + 1;
 210         sv->chanA.dataio = iobase + 3;
 211         sv->chanB.ctrlio = -1;
 212         sv->chanB.dataio = -1;
 213         sv->chanA.irqs = &z8530_nop;
 214         sv->chanB.irqs = &z8530_nop;
 215
 216         outb(0, iobase + 4);            /* DMA off */
 217
 218         /* We want a fast IRQ for this device. Actually we'd like an even faster
 219            IRQ ;) - This is one driver RtLinux is made for */
 220
 221         if (request_irq(irq, z8530_interrupt, IRQF_DISABLED,
 222                         "Hostess SV11", sv) < 0) {
 223                 printk(KERN_WARNING "hostess: IRQ %d already in use.\n", irq);
 224                 goto err_irq;
 225         }
 226
 227         sv->irq = irq;
 228         sv->chanA.private = sv;
 229         sv->chanA.dev = sv;
 230         sv->chanB.dev = sv;
 231
 232         if (dma) {
 233                 /*
 234                  *      You can have DMA off or 1 and 3 thats the lot
 235                  *      on the Comtrol.
 236                  */
 237                 sv->chanA.txdma = 3;
 238                 sv->chanA.rxdma = 1;
 239                 outb(0x03 | 0x08, iobase + 4);          /* DMA on */
 240                 if (request_dma(sv->chanA.txdma, "Hostess SV/11 (TX)"))
 241                         goto err_txdma;
 242
 243                 if (dma == 1)
 244                         if (request_dma(sv->chanA.rxdma, "Hostess SV/11 (RX)"))
 245                                 goto err_rxdma;
 246         }
 247
 248         /* Kill our private IRQ line the hostess can end up chattering
 249            until the configuration is set */
 250         disable_irq(irq);
 251
 252         /*
 253          *      Begin normal initialise
 254          */
 255
 256         if (z8530_init(sv)) {
 257                 printk(KERN_ERR "Z8530 series device not found.\n");
 258                 enable_irq(irq);
 259                 goto free_dma;
 260         }
 261         z8530_channel_load(&sv->chanB, z8530_dead_port);
 262         if (sv->type == Z85C30)
 263                 z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream);
 264         else
 265                 z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream_85230);
 266
 267         enable_irq(irq);
 268
 269         /*
 270          *      Now we can take the IRQ
 271          */
 272
 273         sv->chanA.netdevice = netdev = alloc_hdlcdev(sv);
 274         if (!netdev)
 275                 goto free_dma;
 276
 277         dev_to_hdlc(netdev)->attach = hostess_attach;
 278         dev_to_hdlc(netdev)->xmit = hostess_queue_xmit;
 279         netdev->netdev_ops = &hostess_ops;
 280         netdev->base_addr = iobase;
 281         netdev->irq = irq;
 282
 283         if (register_hdlc_device(netdev)) {
 284                 printk(KERN_ERR "hostess: unable to register HDLC device.\n");
 285                 free_netdev(netdev);
 286                 goto free_dma;
 287         }
 288
 289         z8530_describe(sv, "I/O", iobase);
 290         sv->active = 1;
 291         return sv;
 292
 293 free_dma:
 294         if (dma == 1)
 295                 free_dma(sv->chanA.rxdma);
 296 err_rxdma:
 297         if (dma)
 298                 free_dma(sv->chanA.txdma);
 299 err_txdma:
 300         free_irq(irq, sv);
 301 err_irq:
 302         kfree(sv);
 303 err_kzalloc:
 304         release_region(iobase, 8);
 305         return NULL;
 306 }
 307
 308 static void sv11_shutdown(struct z8530_dev *dev)
 309 {
 310         unregister_hdlc_device(dev->chanA.netdevice);
 311         z8530_shutdown(dev);
 312         free_irq(dev->irq, dev);
 313         if (dma) {
 314                 if (dma == 1)
 315                         free_dma(dev->chanA.rxdma);
 316                 free_dma(dev->chanA.txdma);
 317         }
 318         release_region(dev->chanA.ctrlio - 1, 8);
 319         free_netdev(dev->chanA.netdevice);
 320         kfree(dev);
 321 }
 322
 323 static int io = 0x200;
 324 static int irq = 9;
 325
 326 module_param(io, int, 0);
 327 MODULE_PARM_DESC(io, "The I/O base of the Comtrol Hostess SV11 card");
 328 module_param(dma, int, 0);
 329 MODULE_PARM_DESC(dma, "Set this to 1 to use DMA1/DMA3 for TX/RX");
 330 module_param(irq, int, 0);
 331 MODULE_PARM_DESC(irq, "The interrupt line setting for the Comtrol Hostess SV11 card");
 332
 333 MODULE_AUTHOR("Alan Cox");
 334 MODULE_LICENSE("GPL");
 335 MODULE_DESCRIPTION("Modular driver for the Comtrol Hostess SV11");
 336
 337 static struct z8530_dev *sv11_unit;
 338
 339 int init_module(void)
 340 {
 341         if ((sv11_unit = sv11_init(io, irq)) == NULL)
 342                 return -ENODEV;
 343         return 0;
 344 }
 345
 346 void cleanup_module(void)
 347 {
 348         if (sv11_unit)
 349                 sv11_shutdown(sv11_unit);
 350 }