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 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
  44 static int dma;
  45
  46 /*
  47  *      Network driver support routines
  48  */
  49
  50 static 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
  60 static 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
  78 static 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
 126 static 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
 151 static 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
 162 static 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
 168 static 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
 180 static const struct net_device_ops hostess_ops = {
 181         .ndo_open       = hostess_open,
 182         .ndo_stop       = hostess_close,
 183         .ndo_start_xmit = hdlc_start_xmit,
 184         .ndo_do_ioctl   = hostess_ioctl,
 185 };
 186
 187 static struct z8530_dev *sv11_init(int iobase, int irq)
 188 {
 189         struct z8530_dev *sv;
 190         struct net_device *netdev;
 191         /*
 192          *      Get the needed I/O space
 193          */
 194
 195         if (!request_region(iobase, 8, "Comtrol SV11")) {
 196                 pr_warn("I/O 0x%X already in use\n", iobase);
 197                 return NULL;
 198         }
 199
 200         sv = kzalloc(sizeof(struct z8530_dev), GFP_KERNEL);
 201         if (!sv)
 202                 goto err_kzalloc;
 203
 204         /*
 205          *      Stuff in the I/O addressing
 206          */
 207
 208         sv->active = 0;
 209
 210         sv->chanA.ctrlio = iobase + 1;
 211         sv->chanA.dataio = iobase + 3;
 212         sv->chanB.ctrlio = -1;
 213         sv->chanB.dataio = -1;
 214         sv->chanA.irqs = &z8530_nop;
 215         sv->chanB.irqs = &z8530_nop;
 216
 217         outb(0, iobase + 4);            /* DMA off */
 218
 219         /* We want a fast IRQ for this device. Actually we'd like an even faster
 220            IRQ ;) - This is one driver RtLinux is made for */
 221
 222         if (request_irq(irq, z8530_interrupt, 0,
 223                         "Hostess SV11", sv) < 0) {
 224                 pr_warn("IRQ %d already in use\n", irq);
 225                 goto err_irq;
 226         }
 227
 228         sv->irq = irq;
 229         sv->chanA.private = sv;
 230         sv->chanA.dev = sv;
 231         sv->chanB.dev = sv;
 232
 233         if (dma) {
 234                 /*
 235                  *      You can have DMA off or 1 and 3 thats the lot
 236                  *      on the Comtrol.
 237                  */
 238                 sv->chanA.txdma = 3;
 239                 sv->chanA.rxdma = 1;
 240                 outb(0x03 | 0x08, iobase + 4);          /* DMA on */
 241                 if (request_dma(sv->chanA.txdma, "Hostess SV/11 (TX)"))
 242                         goto err_txdma;
 243
 244                 if (dma == 1)
 245                         if (request_dma(sv->chanA.rxdma, "Hostess SV/11 (RX)"))
 246                                 goto err_rxdma;
 247         }
 248
 249         /* Kill our private IRQ line the hostess can end up chattering
 250            until the configuration is set */
 251         disable_irq(irq);
 252
 253         /*
 254          *      Begin normal initialise
 255          */
 256
 257         if (z8530_init(sv)) {
 258                 pr_err("Z8530 series device not found\n");
 259                 enable_irq(irq);
 260                 goto free_dma;
 261         }
 262         z8530_channel_load(&sv->chanB, z8530_dead_port);
 263         if (sv->type == Z85C30)
 264                 z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream);
 265         else
 266                 z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream_85230);
 267
 268         enable_irq(irq);
 269
 270         /*
 271          *      Now we can take the IRQ
 272          */
 273
 274         sv->chanA.netdevice = netdev = alloc_hdlcdev(sv);
 275         if (!netdev)
 276                 goto free_dma;
 277
 278         dev_to_hdlc(netdev)->attach = hostess_attach;
 279         dev_to_hdlc(netdev)->xmit = hostess_queue_xmit;
 280         netdev->netdev_ops = &hostess_ops;
 281         netdev->base_addr = iobase;
 282         netdev->irq = irq;
 283
 284         if (register_hdlc_device(netdev)) {
 285                 pr_err("unable to register HDLC device\n");
 286                 free_netdev(netdev);
 287                 goto free_dma;
 288         }
 289
 290         z8530_describe(sv, "I/O", iobase);
 291         sv->active = 1;
 292         return sv;
 293
 294 free_dma:
 295         if (dma == 1)
 296                 free_dma(sv->chanA.rxdma);
 297 err_rxdma:
 298         if (dma)
 299                 free_dma(sv->chanA.txdma);
 300 err_txdma:
 301         free_irq(irq, sv);
 302 err_irq:
 303         kfree(sv);
 304 err_kzalloc:
 305         release_region(iobase, 8);
 306         return NULL;
 307 }
 308
 309 static void sv11_shutdown(struct z8530_dev *dev)
 310 {
 311         unregister_hdlc_device(dev->chanA.netdevice);
 312         z8530_shutdown(dev);
 313         free_irq(dev->irq, dev);
 314         if (dma) {
 315                 if (dma == 1)
 316                         free_dma(dev->chanA.rxdma);
 317                 free_dma(dev->chanA.txdma);
 318         }
 319         release_region(dev->chanA.ctrlio - 1, 8);
 320         free_netdev(dev->chanA.netdevice);
 321         kfree(dev);
 322 }
 323
 324 static int io = 0x200;
 325 static int irq = 9;
 326
 327 module_param(io, int, 0);
 328 MODULE_PARM_DESC(io, "The I/O base of the Comtrol Hostess SV11 card");
 329 module_param(dma, int, 0);
 330 MODULE_PARM_DESC(dma, "Set this to 1 to use DMA1/DMA3 for TX/RX");
 331 module_param(irq, int, 0);
 332 MODULE_PARM_DESC(irq, "The interrupt line setting for the Comtrol Hostess SV11 card");
 333
 334 MODULE_AUTHOR("Alan Cox");
 335 MODULE_LICENSE("GPL");
 336 MODULE_DESCRIPTION("Modular driver for the Comtrol Hostess SV11");
 337
 338 static struct z8530_dev *sv11_unit;
 339
 340 int init_module(void)
 341 {
 342         if ((sv11_unit = sv11_init(io, irq)) == NULL)
 343                 return -ENODEV;
 344         return 0;
 345 }
 346
 347 void cleanup_module(void)
 348 {
 349         if (sv11_unit)
 350                 sv11_shutdown(sv11_unit);
 351 }