drivers/net/wan/c101.c

   1 /*
   2  * Moxa C101 synchronous serial card driver for Linux
   3  *
   4  * Copyright (C) 2000-2003 Krzysztof Halasa <khc@pm.waw.pl>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of version 2 of the GNU General Public License
   8  * as published by the Free Software Foundation.
   9  *
  10  * For information see <http://www.kernel.org/pub/linux/utils/net/hdlc/>
  11  *
  12  * Sources of information:
  13  *    Hitachi HD64570 SCA User's Manual
  14  *    Moxa C101 User's Manual
  15  */
  16
  17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  18
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/capability.h>
  22 #include <linux/slab.h>
  23 #include <linux/types.h>
  24 #include <linux/string.h>
  25 #include <linux/errno.h>
  26 #include <linux/init.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/hdlc.h>
  30 #include <linux/delay.h>
  31 #include <asm/io.h>
  32
  33 #include "hd64570.h"
  34
  35
  36 static const char* version = "Moxa C101 driver version: 1.15";
  37 static const char* devname = "C101";
  38
  39 #undef DEBUG_PKT
  40 #define DEBUG_RINGS
  41
  42 #define C101_PAGE 0x1D00
  43 #define C101_DTR 0x1E00
  44 #define C101_SCA 0x1F00
  45 #define C101_WINDOW_SIZE 0x2000
  46 #define C101_MAPPED_RAM_SIZE 0x4000
  47
  48 #define RAM_SIZE (256 * 1024)
  49 #define TX_RING_BUFFERS 10
  50 #define RX_RING_BUFFERS ((RAM_SIZE - C101_WINDOW_SIZE) /                \
  51                          (sizeof(pkt_desc) + HDLC_MAX_MRU) - TX_RING_BUFFERS)
  52
  53 #define CLOCK_BASE 9830400      /* 9.8304 MHz */
  54 #define PAGE0_ALWAYS_MAPPED
  55
  56 static char *hw;                /* pointer to hw=xxx command line string */
  57
  58
  59 typedef struct card_s {
  60         struct net_device *dev;
  61         spinlock_t lock;        /* TX lock */
  62         u8 __iomem *win0base;   /* ISA window base address */
  63         u32 phy_winbase;        /* ISA physical base address */
  64         sync_serial_settings settings;
  65         int rxpart;             /* partial frame received, next frame invalid*/
  66         unsigned short encoding;
  67         unsigned short parity;
  68         u16 rx_ring_buffers;    /* number of buffers in a ring */
  69         u16 tx_ring_buffers;
  70         u16 buff_offset;        /* offset of first buffer of first channel */
  71         u16 rxin;               /* rx ring buffer 'in' pointer */
  72         u16 txin;               /* tx ring buffer 'in' and 'last' pointers */
  73         u16 txlast;
  74         u8 rxs, txs, tmc;       /* SCA registers */
  75         u8 irq;                 /* IRQ (3-15) */
  76         u8 page;
  77
  78         struct card_s *next_card;
  79 }card_t;
  80
  81 typedef card_t port_t;
  82
  83 static card_t *first_card;
  84 static card_t **new_card = &first_card;
  85
  86
  87 #define sca_in(reg, card)          readb((card)->win0base + C101_SCA + (reg))
  88 #define sca_out(value, reg, card)  writeb(value, (card)->win0base + C101_SCA + (reg))
  89 #define sca_inw(reg, card)         readw((card)->win0base + C101_SCA + (reg))
  90
  91 /* EDA address register must be set in EDAL, EDAH order - 8 bit ISA bus */
  92 #define sca_outw(value, reg, card) do { \
  93         writeb(value & 0xFF, (card)->win0base + C101_SCA + (reg)); \
  94         writeb((value >> 8 ) & 0xFF, (card)->win0base + C101_SCA + (reg + 1));\
  95 } while(0)
  96
  97 #define port_to_card(port)         (port)
  98 #define log_node(port)             (0)
  99 #define phy_node(port)             (0)
 100 #define winsize(card)              (C101_WINDOW_SIZE)
 101 #define win0base(card)             ((card)->win0base)
 102 #define winbase(card)              ((card)->win0base + 0x2000)
 103 #define get_port(card, port)       (card)
 104 static void sca_msci_intr(port_t *port);
 105
 106
 107 static inline u8 sca_get_page(card_t *card)
 108 {
 109         return card->page;
 110 }
 111
 112 static inline void openwin(card_t *card, u8 page)
 113 {
 114         card->page = page;
 115         writeb(page, card->win0base + C101_PAGE);
 116 }
 117
 118
 119 #include "hd64570.c"
 120
 121
 122 static inline void set_carrier(port_t *port)
 123 {
 124         if (!(sca_in(MSCI1_OFFSET + ST3, port) & ST3_DCD))
 125                 netif_carrier_on(port_to_dev(port));
 126         else
 127                 netif_carrier_off(port_to_dev(port));
 128 }
 129
 130
 131 static void sca_msci_intr(port_t *port)
 132 {
 133         u8 stat = sca_in(MSCI0_OFFSET + ST1, port); /* read MSCI ST1 status */
 134
 135         /* Reset MSCI TX underrun and CDCD (ignored) status bit */
 136         sca_out(stat & (ST1_UDRN | ST1_CDCD), MSCI0_OFFSET + ST1, port);
 137
 138         if (stat & ST1_UDRN) {
 139                 /* TX Underrun error detected */
 140                 port_to_dev(port)->stats.tx_errors++;
 141                 port_to_dev(port)->stats.tx_fifo_errors++;
 142         }
 143
 144         stat = sca_in(MSCI1_OFFSET + ST1, port); /* read MSCI1 ST1 status */
 145         /* Reset MSCI CDCD status bit - uses ch#2 DCD input */
 146         sca_out(stat & ST1_CDCD, MSCI1_OFFSET + ST1, port);
 147
 148         if (stat & ST1_CDCD)
 149                 set_carrier(port);
 150 }
 151
 152
 153 static void c101_set_iface(port_t *port)
 154 {
 155         u8 rxs = port->rxs & CLK_BRG_MASK;
 156         u8 txs = port->txs & CLK_BRG_MASK;
 157
 158         switch(port->settings.clock_type) {
 159         case CLOCK_INT:
 160                 rxs |= CLK_BRG_RX; /* TX clock */
 161                 txs |= CLK_RXCLK_TX; /* BRG output */
 162                 break;
 163
 164         case CLOCK_TXINT:
 165                 rxs |= CLK_LINE_RX; /* RXC input */
 166                 txs |= CLK_BRG_TX; /* BRG output */
 167                 break;
 168
 169         case CLOCK_TXFROMRX:
 170                 rxs |= CLK_LINE_RX; /* RXC input */
 171                 txs |= CLK_RXCLK_TX; /* RX clock */
 172                 break;
 173
 174         default:        /* EXTernal clock */
 175                 rxs |= CLK_LINE_RX; /* RXC input */
 176                 txs |= CLK_LINE_TX; /* TXC input */
 177         }
 178
 179         port->rxs = rxs;
 180         port->txs = txs;
 181         sca_out(rxs, MSCI1_OFFSET + RXS, port);
 182         sca_out(txs, MSCI1_OFFSET + TXS, port);
 183         sca_set_port(port);
 184 }
 185
 186
 187 static int c101_open(struct net_device *dev)
 188 {
 189         port_t *port = dev_to_port(dev);
 190         int result;
 191
 192         result = hdlc_open(dev);
 193         if (result)
 194                 return result;
 195
 196         writeb(1, port->win0base + C101_DTR);
 197         sca_out(0, MSCI1_OFFSET + CTL, port); /* RTS uses ch#2 output */
 198         sca_open(dev);
 199         /* DCD is connected to port 2 !@#$%^& - disable MSCI0 CDCD interrupt */
 200         sca_out(IE1_UDRN, MSCI0_OFFSET + IE1, port);
 201         sca_out(IE0_TXINT, MSCI0_OFFSET + IE0, port);
 202
 203         set_carrier(port);
 204
 205         /* enable MSCI1 CDCD interrupt */
 206         sca_out(IE1_CDCD, MSCI1_OFFSET + IE1, port);
 207         sca_out(IE0_RXINTA, MSCI1_OFFSET + IE0, port);
 208         sca_out(0x48, IER0, port); /* TXINT #0 and RXINT #1 */
 209         c101_set_iface(port);
 210         return 0;
 211 }
 212
 213
 214 static int c101_close(struct net_device *dev)
 215 {
 216         port_t *port = dev_to_port(dev);
 217
 218         sca_close(dev);
 219         writeb(0, port->win0base + C101_DTR);
 220         sca_out(CTL_NORTS, MSCI1_OFFSET + CTL, port);
 221         hdlc_close(dev);
 222         return 0;
 223 }
 224
 225
 226 static int c101_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 227 {
 228         const size_t size = sizeof(sync_serial_settings);
 229         sync_serial_settings new_line;
 230         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
 231         port_t *port = dev_to_port(dev);
 232
 233 #ifdef DEBUG_RINGS
 234         if (cmd == SIOCDEVPRIVATE) {
 235                 sca_dump_rings(dev);
 236                 printk(KERN_DEBUG "MSCI1: ST: %02x %02x %02x %02x\n",
 237                        sca_in(MSCI1_OFFSET + ST0, port),
 238                        sca_in(MSCI1_OFFSET + ST1, port),
 239                        sca_in(MSCI1_OFFSET + ST2, port),
 240                        sca_in(MSCI1_OFFSET + ST3, port));
 241                 return 0;
 242         }
 243 #endif
 244         if (cmd != SIOCWANDEV)
 245                 return hdlc_ioctl(dev, ifr, cmd);
 246
 247         switch(ifr->ifr_settings.type) {
 248         case IF_GET_IFACE:
 249                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
 250                 if (ifr->ifr_settings.size < size) {
 251                         ifr->ifr_settings.size = size; /* data size wanted */
 252                         return -ENOBUFS;
 253                 }
 254                 if (copy_to_user(line, &port->settings, size))
 255                         return -EFAULT;
 256                 return 0;
 257
 258         case IF_IFACE_SYNC_SERIAL:
 259                 if(!capable(CAP_NET_ADMIN))
 260                         return -EPERM;
 261
 262                 if (copy_from_user(&new_line, line, size))
 263                         return -EFAULT;
 264
 265                 if (new_line.clock_type != CLOCK_EXT &&
 266                     new_line.clock_type != CLOCK_TXFROMRX &&
 267                     new_line.clock_type != CLOCK_INT &&
 268                     new_line.clock_type != CLOCK_TXINT)
 269                         return -EINVAL; /* No such clock setting */
 270
 271                 if (new_line.loopback != 0 && new_line.loopback != 1)
 272                         return -EINVAL;
 273
 274                 memcpy(&port->settings, &new_line, size); /* Update settings */
 275                 c101_set_iface(port);
 276                 return 0;
 277
 278         default:
 279                 return hdlc_ioctl(dev, ifr, cmd);
 280         }
 281 }
 282
 283
 284
 285 static void c101_destroy_card(card_t *card)
 286 {
 287         readb(card->win0base + C101_PAGE); /* Resets SCA? */
 288
 289         if (card->irq)
 290                 free_irq(card->irq, card);
 291
 292         if (card->win0base) {
 293                 iounmap(card->win0base);
 294                 release_mem_region(card->phy_winbase, C101_MAPPED_RAM_SIZE);
 295         }
 296
 297         free_netdev(card->dev);
 298
 299         kfree(card);
 300 }
 301
 302 static const struct net_device_ops c101_ops = {
 303         .ndo_open       = c101_open,
 304         .ndo_stop       = c101_close,
 305         .ndo_change_mtu = hdlc_change_mtu,
 306         .ndo_start_xmit = hdlc_start_xmit,
 307         .ndo_do_ioctl   = c101_ioctl,
 308 };
 309
 310 static int __init c101_run(unsigned long irq, unsigned long winbase)
 311 {
 312         struct net_device *dev;
 313         hdlc_device *hdlc;
 314         card_t *card;
 315         int result;
 316
 317         if (irq<3 || irq>15 || irq == 6) /* FIXME */ {
 318                 pr_err("invalid IRQ value\n");
 319                 return -ENODEV;
 320         }
 321
 322         if (winbase < 0xC0000 || winbase > 0xDFFFF || (winbase & 0x3FFF) !=0) {
 323                 pr_err("invalid RAM value\n");
 324                 return -ENODEV;
 325         }
 326
 327         card = kzalloc(sizeof(card_t), GFP_KERNEL);
 328         if (card == NULL) {
 329                 pr_err("unable to allocate memory\n");
 330                 return -ENOBUFS;
 331         }
 332
 333         card->dev = alloc_hdlcdev(card);
 334         if (!card->dev) {
 335                 pr_err("unable to allocate memory\n");
 336                 kfree(card);
 337                 return -ENOBUFS;
 338         }
 339
 340         if (request_irq(irq, sca_intr, 0, devname, card)) {
 341                 pr_err("could not allocate IRQ\n");
 342                 c101_destroy_card(card);
 343                 return -EBUSY;
 344         }
 345         card->irq = irq;
 346
 347         if (!request_mem_region(winbase, C101_MAPPED_RAM_SIZE, devname)) {
 348                 pr_err("could not request RAM window\n");
 349                 c101_destroy_card(card);
 350                 return -EBUSY;
 351         }
 352         card->phy_winbase = winbase;
 353         card->win0base = ioremap(winbase, C101_MAPPED_RAM_SIZE);
 354         if (!card->win0base) {
 355                 pr_err("could not map I/O address\n");
 356                 c101_destroy_card(card);
 357                 return -EFAULT;
 358         }
 359
 360         card->tx_ring_buffers = TX_RING_BUFFERS;
 361         card->rx_ring_buffers = RX_RING_BUFFERS;
 362         card->buff_offset = C101_WINDOW_SIZE; /* Bytes 1D00-1FFF reserved */
 363
 364         readb(card->win0base + C101_PAGE); /* Resets SCA? */
 365         udelay(100);
 366         writeb(0, card->win0base + C101_PAGE);
 367         writeb(0, card->win0base + C101_DTR); /* Power-up for RAM? */
 368
 369         sca_init(card, 0);
 370
 371         dev = port_to_dev(card);
 372         hdlc = dev_to_hdlc(dev);
 373
 374         spin_lock_init(&card->lock);
 375         dev->irq = irq;
 376         dev->mem_start = winbase;
 377         dev->mem_end = winbase + C101_MAPPED_RAM_SIZE - 1;
 378         dev->tx_queue_len = 50;
 379         dev->netdev_ops = &c101_ops;
 380         hdlc->attach = sca_attach;
 381         hdlc->xmit = sca_xmit;
 382         card->settings.clock_type = CLOCK_EXT;
 383
 384         result = register_hdlc_device(dev);
 385         if (result) {
 386                 pr_warn("unable to register hdlc device\n");
 387                 c101_destroy_card(card);
 388                 return result;
 389         }
 390
 391         sca_init_port(card); /* Set up C101 memory */
 392         set_carrier(card);
 393
 394         netdev_info(dev, "Moxa C101 on IRQ%u, using %u TX + %u RX packets rings\n",
 395                     card->irq, card->tx_ring_buffers, card->rx_ring_buffers);
 396
 397         *new_card = card;
 398         new_card = &card->next_card;
 399         return 0;
 400 }
 401
 402
 403
 404 static int __init c101_init(void)
 405 {
 406         if (hw == NULL) {
 407 #ifdef MODULE
 408                 pr_info("no card initialized\n");
 409 #endif
 410                 return -EINVAL; /* no parameters specified, abort */
 411         }
 412
 413         pr_info("%s\n", version);
 414
 415         do {
 416                 unsigned long irq, ram;
 417
 418                 irq = simple_strtoul(hw, &hw, 0);
 419
 420                 if (*hw++ != ',')
 421                         break;
 422                 ram = simple_strtoul(hw, &hw, 0);
 423
 424                 if (*hw == ':' || *hw == '\x0')
 425                         c101_run(irq, ram);
 426
 427                 if (*hw == '\x0')
 428                         return first_card ? 0 : -EINVAL;
 429         }while(*hw++ == ':');
 430
 431         pr_err("invalid hardware parameters\n");
 432         return first_card ? 0 : -EINVAL;
 433 }
 434
 435
 436 static void __exit c101_cleanup(void)
 437 {
 438         card_t *card = first_card;
 439
 440         while (card) {
 441                 card_t *ptr = card;
 442                 card = card->next_card;
 443                 unregister_hdlc_device(port_to_dev(ptr));
 444                 c101_destroy_card(ptr);
 445         }
 446 }
 447
 448
 449 module_init(c101_init);
 450 module_exit(c101_cleanup);
 451
 452 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
 453 MODULE_DESCRIPTION("Moxa C101 serial port driver");
 454 MODULE_LICENSE("GPL v2");
 455 module_param(hw, charp, 0444);
 456 MODULE_PARM_DESC(hw, "irq,ram:irq,...");