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 int hostess_queue_xmit(struct sk_buff *skb, struct net_device *d)
 160 {
 161         return z8530_queue_xmit(&dev_to_sv(d)->chanA, skb);
 162 }
 163
 164 static int hostess_attach(struct net_device *dev, unsigned short encoding,
 165                           unsigned short parity)
 166 {
 167         if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
 168                 return 0;
 169         return -EINVAL;
 170 }
 171
 172 /*
 173  *      Description block for a Comtrol Hostess SV11 card
 174  */
 175
 176 static struct z8530_dev *sv11_init(int iobase, int irq)
 177 {
 178         struct z8530_dev *sv;
 179         struct net_device *netdev;
 180         /*
 181          *      Get the needed I/O space
 182          */
 183
 184         if (!request_region(iobase, 8, "Comtrol SV11")) {
 185                 printk(KERN_WARNING "hostess: I/O 0x%X already in use.\n",
 186                        iobase);
 187                 return NULL;
 188         }
 189
 190         sv = kzalloc(sizeof(struct z8530_dev), GFP_KERNEL);
 191         if (!sv)
 192                 goto err_kzalloc;
 193
 194         /*
 195          *      Stuff in the I/O addressing
 196          */
 197
 198         sv->active = 0;
 199
 200         sv->chanA.ctrlio = iobase + 1;
 201         sv->chanA.dataio = iobase + 3;
 202         sv->chanB.ctrlio = -1;
 203         sv->chanB.dataio = -1;
 204         sv->chanA.irqs = &z8530_nop;
 205         sv->chanB.irqs = &z8530_nop;
 206
 207         outb(0, iobase + 4);            /* DMA off */
 208
 209         /* We want a fast IRQ for this device. Actually we'd like an even faster
 210            IRQ ;) - This is one driver RtLinux is made for */
 211
 212         if (request_irq(irq, &z8530_interrupt, IRQF_DISABLED,
 213                         "Hostess SV11", sv) < 0) {
 214                 printk(KERN_WARNING "hostess: IRQ %d already in use.\n", irq);
 215                 goto err_irq;
 216         }
 217
 218         sv->irq = irq;
 219         sv->chanA.private = sv;
 220         sv->chanA.dev = sv;
 221         sv->chanB.dev = sv;
 222
 223         if (dma) {
 224                 /*
 225                  *      You can have DMA off or 1 and 3 thats the lot
 226                  *      on the Comtrol.
 227                  */
 228                 sv->chanA.txdma = 3;
 229                 sv->chanA.rxdma = 1;
 230                 outb(0x03 | 0x08, iobase + 4);          /* DMA on */
 231                 if (request_dma(sv->chanA.txdma, "Hostess SV/11 (TX)"))
 232                         goto err_txdma;
 233
 234                 if (dma == 1)
 235                         if (request_dma(sv->chanA.rxdma, "Hostess SV/11 (RX)"))
 236                                 goto err_rxdma;
 237         }
 238
 239         /* Kill our private IRQ line the hostess can end up chattering
 240            until the configuration is set */
 241         disable_irq(irq);
 242
 243         /*
 244          *      Begin normal initialise
 245          */
 246
 247         if (z8530_init(sv)) {
 248                 printk(KERN_ERR "Z8530 series device not found.\n");
 249                 enable_irq(irq);
 250                 goto free_dma;
 251         }
 252         z8530_channel_load(&sv->chanB, z8530_dead_port);
 253         if (sv->type == Z85C30)
 254                 z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream);
 255         else
 256                 z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream_85230);
 257
 258         enable_irq(irq);
 259
 260         /*
 261          *      Now we can take the IRQ
 262          */
 263
 264         sv->chanA.netdevice = netdev = alloc_hdlcdev(sv);
 265         if (!netdev)
 266                 goto free_dma;
 267
 268         dev_to_hdlc(netdev)->attach = hostess_attach;
 269         dev_to_hdlc(netdev)->xmit = hostess_queue_xmit;
 270         netdev->open = hostess_open;
 271         netdev->stop = hostess_close;
 272         netdev->do_ioctl = hostess_ioctl;
 273         netdev->base_addr = iobase;
 274         netdev->irq = irq;
 275
 276         if (register_hdlc_device(netdev)) {
 277                 printk(KERN_ERR "hostess: unable to register HDLC device.\n");
 278                 free_netdev(netdev);
 279                 goto free_dma;
 280         }
 281
 282         z8530_describe(sv, "I/O", iobase);
 283         sv->active = 1;
 284         return sv;
 285
 286 free_dma:
 287         if (dma == 1)
 288                 free_dma(sv->chanA.rxdma);
 289 err_rxdma:
 290         if (dma)
 291                 free_dma(sv->chanA.txdma);
 292 err_txdma:
 293         free_irq(irq, sv);
 294 err_irq:
 295         kfree(sv);
 296 err_kzalloc:
 297         release_region(iobase, 8);
 298         return NULL;
 299 }
 300
 301 static void sv11_shutdown(struct z8530_dev *dev)
 302 {
 303         unregister_hdlc_device(dev->chanA.netdevice);
 304         z8530_shutdown(dev);
 305         free_irq(dev->irq, dev);
 306         if (dma) {
 307                 if (dma == 1)
 308                         free_dma(dev->chanA.rxdma);
 309                 free_dma(dev->chanA.txdma);
 310         }
 311         release_region(dev->chanA.ctrlio - 1, 8);
 312         free_netdev(dev->chanA.netdevice);
 313         kfree(dev);
 314 }
 315
 316 static int io = 0x200;
 317 static int irq = 9;
 318
 319 module_param(io, int, 0);
 320 MODULE_PARM_DESC(io, "The I/O base of the Comtrol Hostess SV11 card");
 321 module_param(dma, int, 0);
 322 MODULE_PARM_DESC(dma, "Set this to 1 to use DMA1/DMA3 for TX/RX");
 323 module_param(irq, int, 0);
 324 MODULE_PARM_DESC(irq, "The interrupt line setting for the Comtrol Hostess SV11 card");
 325
 326 MODULE_AUTHOR("Alan Cox");
 327 MODULE_LICENSE("GPL");
 328 MODULE_DESCRIPTION("Modular driver for the Comtrol Hostess SV11");
 329
 330 static struct z8530_dev *sv11_unit;
 331
 332 int init_module(void)
 333 {
 334         if ((sv11_unit = sv11_init(io, irq)) == NULL)
 335                 return -ENODEV;
 336         return 0;
 337 }
 338
 339 void cleanup_module(void)
 340 {
 341         if (sv11_unit)
 342                 sv11_shutdown(sv11_unit);
 343 }