drivers/net/wan/hostess_sv11.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *      Comtrol SV11 card driver
   4  *
   5  *      This is a slightly odd Z85230 synchronous driver. All you need to
   6  *      know basically is
   7  *
   8  *      Its a genuine Z85230
   9  *
  10  *      It supports DMA using two DMA channels in SYNC mode. The driver doesn't
  11  *      use these facilities
  12  *
  13  *      The control port is at io+1, the data at io+3 and turning off the DMA
  14  *      is done by writing 0 to io+4
  15  *
  16  *      The hardware does the bus handling to avoid the need for delays between
  17  *      touching control registers.
  18  *
  19  *      Port B isn't wired (why - beats me)
  20  *
  21  *      Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl>
  22  */
  23
  24 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  25
  26 #include <linux/module.h>
  27 #include <linux/kernel.h>
  28 #include <linux/mm.h>
  29 #include <linux/net.h>
  30 #include <linux/skbuff.h>
  31 #include <linux/netdevice.h>
  32 #include <linux/if_arp.h>
  33 #include <linux/delay.h>
  34 #include <linux/hdlc.h>
  35 #include <linux/ioport.h>
  36 #include <linux/slab.h>
  37 #include <net/arp.h>
  38
  39 #include <asm/irq.h>
  40 #include <asm/io.h>
  41 #include <asm/dma.h>
  42 #include <asm/byteorder.h>
  43 #include "z85230.h"
  44
  45 static int dma;
  46
  47 /*
  48  *      Network driver support routines
  49  */
  50
  51 static inline struct z8530_dev* dev_to_sv(struct net_device *dev)
  52 {
  53         return (struct z8530_dev *)dev_to_hdlc(dev)->priv;
  54 }
  55
  56 /*
  57  *      Frame receive. Simple for our card as we do HDLC and there
  58  *      is no funny garbage involved
  59  */
  60
  61 static void hostess_input(struct z8530_channel *c, struct sk_buff *skb)
  62 {
  63         /* Drop the CRC - it's not a good idea to try and negotiate it ;) */
  64         skb_trim(skb, skb->len - 2);
  65         skb->protocol = hdlc_type_trans(skb, c->netdevice);
  66         skb_reset_mac_header(skb);
  67         skb->dev = c->netdevice;
  68         /*
  69          *      Send it to the PPP layer. We don't have time to process
  70          *      it right now.
  71          */
  72         netif_rx(skb);
  73 }
  74
  75 /*
  76  *      We've been placed in the UP state
  77  */
  78
  79 static int hostess_open(struct net_device *d)
  80 {
  81         struct z8530_dev *sv11 = dev_to_sv(d);
  82         int err = -1;
  83
  84         /*
  85          *      Link layer up
  86          */
  87         switch (dma) {
  88                 case 0:
  89                         err = z8530_sync_open(d, &sv11->chanA);
  90                         break;
  91                 case 1:
  92                         err = z8530_sync_dma_open(d, &sv11->chanA);
  93                         break;
  94                 case 2:
  95                         err = z8530_sync_txdma_open(d, &sv11->chanA);
  96                         break;
  97         }
  98
  99         if (err)
 100                 return err;
 101
 102         err = hdlc_open(d);
 103         if (err) {
 104                 switch (dma) {
 105                         case 0:
 106                                 z8530_sync_close(d, &sv11->chanA);
 107                                 break;
 108                         case 1:
 109                                 z8530_sync_dma_close(d, &sv11->chanA);
 110                                 break;
 111                         case 2:
 112                                 z8530_sync_txdma_close(d, &sv11->chanA);
 113                                 break;
 114                 }
 115                 return err;
 116         }
 117         sv11->chanA.rx_function = hostess_input;
 118
 119         /*
 120          *      Go go go
 121          */
 122
 123         netif_start_queue(d);
 124         return 0;
 125 }
 126
 127 static int hostess_close(struct net_device *d)
 128 {
 129         struct z8530_dev *sv11 = dev_to_sv(d);
 130         /*
 131          *      Discard new frames
 132          */
 133         sv11->chanA.rx_function = z8530_null_rx;
 134
 135         hdlc_close(d);
 136         netif_stop_queue(d);
 137
 138         switch (dma) {
 139                 case 0:
 140                         z8530_sync_close(d, &sv11->chanA);
 141                         break;
 142                 case 1:
 143                         z8530_sync_dma_close(d, &sv11->chanA);
 144                         break;
 145                 case 2:
 146                         z8530_sync_txdma_close(d, &sv11->chanA);
 147                         break;
 148         }
 149         return 0;
 150 }
 151
 152 static int hostess_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
 153 {
 154         /* struct z8530_dev *sv11=dev_to_sv(d);
 155            z8530_ioctl(d,&sv11->chanA,ifr,cmd) */
 156         return hdlc_ioctl(d, ifr, cmd);
 157 }
 158
 159 /*
 160  *      Passed network frames, fire them downwind.
 161  */
 162
 163 static netdev_tx_t hostess_queue_xmit(struct sk_buff *skb,
 164                                             struct net_device *d)
 165 {
 166         return z8530_queue_xmit(&dev_to_sv(d)->chanA, skb);
 167 }
 168
 169 static int hostess_attach(struct net_device *dev, unsigned short encoding,
 170                           unsigned short parity)
 171 {
 172         if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
 173                 return 0;
 174         return -EINVAL;
 175 }
 176
 177 /*
 178  *      Description block for a Comtrol Hostess SV11 card
 179  */
 180
 181 static const struct net_device_ops hostess_ops = {
 182         .ndo_open       = hostess_open,
 183         .ndo_stop       = hostess_close,
 184         .ndo_start_xmit = hdlc_start_xmit,
 185         .ndo_do_ioctl   = hostess_ioctl,
 186 };
 187
 188 static 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, 0,
 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
 295 free_dma:
 296         if (dma == 1)
 297                 free_dma(sv->chanA.rxdma);
 298 err_rxdma:
 299         if (dma)
 300                 free_dma(sv->chanA.txdma);
 301 err_txdma:
 302         free_irq(irq, sv);
 303 err_irq:
 304         kfree(sv);
 305 err_kzalloc:
 306         release_region(iobase, 8);
 307         return NULL;
 308 }
 309
 310 static 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
 325 static int io = 0x200;
 326 static int irq = 9;
 327
 328 module_param_hw(io, int, ioport, 0);
 329 MODULE_PARM_DESC(io, "The I/O base of the Comtrol Hostess SV11 card");
 330 module_param_hw(dma, int, dma, 0);
 331 MODULE_PARM_DESC(dma, "Set this to 1 to use DMA1/DMA3 for TX/RX");
 332 module_param_hw(irq, int, irq, 0);
 333 MODULE_PARM_DESC(irq, "The interrupt line setting for the Comtrol Hostess SV11 card");
 334
 335 MODULE_AUTHOR("Alan Cox");
 336 MODULE_LICENSE("GPL");
 337 MODULE_DESCRIPTION("Modular driver for the Comtrol Hostess SV11");
 338
 339 static struct z8530_dev *sv11_unit;
 340
 341 int init_module(void)
 342 {
 343         if ((sv11_unit = sv11_init(io, irq)) == NULL)
 344                 return -ENODEV;
 345         return 0;
 346 }
 347
 348 void cleanup_module(void)
 349 {
 350         if (sv11_unit)
 351                 sv11_shutdown(sv11_unit);
 352 }