drivers/net/wan/pci200syn.c

   1 /*
   2  * Goramo PCI200SYN synchronous serial card driver for Linux
   3  *
   4  * Copyright (C) 2002-2008 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 HD64572 SCA-II User's Manual
  14  *    PLX Technology Inc. PCI9052 Data Book
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/kernel.h>
  19 #include <linux/capability.h>
  20 #include <linux/slab.h>
  21 #include <linux/types.h>
  22 #include <linux/fcntl.h>
  23 #include <linux/in.h>
  24 #include <linux/string.h>
  25 #include <linux/errno.h>
  26 #include <linux/init.h>
  27 #include <linux/ioport.h>
  28 #include <linux/moduleparam.h>
  29 #include <linux/netdevice.h>
  30 #include <linux/hdlc.h>
  31 #include <linux/pci.h>
  32 #include <linux/delay.h>
  33 #include <asm/io.h>
  34
  35 #include "hd64572.h"
  36
  37 #undef DEBUG_PKT
  38 #define DEBUG_RINGS
  39
  40 #define PCI200SYN_PLX_SIZE      0x80    /* PLX control window size (128b) */
  41 #define PCI200SYN_SCA_SIZE      0x400   /* SCA window size (1Kb) */
  42 #define MAX_TX_BUFFERS          10
  43
  44 static int pci_clock_freq = 33000000;
  45 #define CLOCK_BASE pci_clock_freq
  46
  47 /*
  48  *      PLX PCI9052 local configuration and shared runtime registers.
  49  *      This structure can be used to access 9052 registers (memory mapped).
  50  */
  51 typedef struct {
  52         u32 loc_addr_range[4];  /* 00-0Ch : Local Address Ranges */
  53         u32 loc_rom_range;      /* 10h : Local ROM Range */
  54         u32 loc_addr_base[4];   /* 14-20h : Local Address Base Addrs */
  55         u32 loc_rom_base;       /* 24h : Local ROM Base */
  56         u32 loc_bus_descr[4];   /* 28-34h : Local Bus Descriptors */
  57         u32 rom_bus_descr;      /* 38h : ROM Bus Descriptor */
  58         u32 cs_base[4];         /* 3C-48h : Chip Select Base Addrs */
  59         u32 intr_ctrl_stat;     /* 4Ch : Interrupt Control/Status */
  60         u32 init_ctrl;          /* 50h : EEPROM ctrl, Init Ctrl, etc */
  61 }plx9052;
  62
  63
  64
  65 typedef struct port_s {
  66         struct napi_struct napi;
  67         struct net_device *netdev;
  68         struct card_s *card;
  69         spinlock_t lock;        /* TX lock */
  70         sync_serial_settings settings;
  71         int rxpart;             /* partial frame received, next frame invalid*/
  72         unsigned short encoding;
  73         unsigned short parity;
  74         u16 rxin;               /* rx ring buffer 'in' pointer */
  75         u16 txin;               /* tx ring buffer 'in' and 'last' pointers */
  76         u16 txlast;
  77         u8 rxs, txs, tmc;       /* SCA registers */
  78         u8 chan;                /* physical port # - 0 or 1 */
  79 }port_t;
  80
  81
  82
  83 typedef struct card_s {
  84         u8 __iomem *rambase;    /* buffer memory base (virtual) */
  85         u8 __iomem *scabase;    /* SCA memory base (virtual) */
  86         plx9052 __iomem *plxbase;/* PLX registers memory base (virtual) */
  87         u16 rx_ring_buffers;    /* number of buffers in a ring */
  88         u16 tx_ring_buffers;
  89         u16 buff_offset;        /* offset of first buffer of first channel */
  90         u8 irq;                 /* interrupt request level */
  91
  92         port_t ports[2];
  93 }card_t;
  94
  95
  96 #define get_port(card, port)         (&card->ports[port])
  97 #define sca_flush(card)              (sca_in(IER0, card));
  98
  99 static inline void new_memcpy_toio(char __iomem *dest, char *src, int length)
 100 {
 101         int len;
 102         do {
 103                 len = length > 256 ? 256 : length;
 104                 memcpy_toio(dest, src, len);
 105                 dest += len;
 106                 src += len;
 107                 length -= len;
 108                 readb(dest);
 109         } while (len);
 110 }
 111
 112 #undef memcpy_toio
 113 #define memcpy_toio new_memcpy_toio
 114
 115 #include "hd64572.c"
 116
 117
 118 static void pci200_set_iface(port_t *port)
 119 {
 120         card_t *card = port->card;
 121         u16 msci = get_msci(port);
 122         u8 rxs = port->rxs & CLK_BRG_MASK;
 123         u8 txs = port->txs & CLK_BRG_MASK;
 124
 125         sca_out(EXS_TES1, (port->chan ? MSCI1_OFFSET : MSCI0_OFFSET) + EXS,
 126                 port->card);
 127         switch(port->settings.clock_type) {
 128         case CLOCK_INT:
 129                 rxs |= CLK_BRG; /* BRG output */
 130                 txs |= CLK_PIN_OUT | CLK_TX_RXCLK; /* RX clock */
 131                 break;
 132
 133         case CLOCK_TXINT:
 134                 rxs |= CLK_LINE; /* RXC input */
 135                 txs |= CLK_PIN_OUT | CLK_BRG; /* BRG output */
 136                 break;
 137
 138         case CLOCK_TXFROMRX:
 139                 rxs |= CLK_LINE; /* RXC input */
 140                 txs |= CLK_PIN_OUT | CLK_TX_RXCLK; /* RX clock */
 141                 break;
 142
 143         default:                /* EXTernal clock */
 144                 rxs |= CLK_LINE; /* RXC input */
 145                 txs |= CLK_PIN_OUT | CLK_LINE; /* TXC input */
 146                 break;
 147         }
 148
 149         port->rxs = rxs;
 150         port->txs = txs;
 151         sca_out(rxs, msci + RXS, card);
 152         sca_out(txs, msci + TXS, card);
 153         sca_set_port(port);
 154 }
 155
 156
 157
 158 static int pci200_open(struct net_device *dev)
 159 {
 160         port_t *port = dev_to_port(dev);
 161
 162         int result = hdlc_open(dev);
 163         if (result)
 164                 return result;
 165
 166         sca_open(dev);
 167         pci200_set_iface(port);
 168         sca_flush(port->card);
 169         return 0;
 170 }
 171
 172
 173
 174 static int pci200_close(struct net_device *dev)
 175 {
 176         sca_close(dev);
 177         sca_flush(dev_to_port(dev)->card);
 178         hdlc_close(dev);
 179         return 0;
 180 }
 181
 182
 183
 184 static int pci200_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 185 {
 186         const size_t size = sizeof(sync_serial_settings);
 187         sync_serial_settings new_line;
 188         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
 189         port_t *port = dev_to_port(dev);
 190
 191 #ifdef DEBUG_RINGS
 192         if (cmd == SIOCDEVPRIVATE) {
 193                 sca_dump_rings(dev);
 194                 return 0;
 195         }
 196 #endif
 197         if (cmd != SIOCWANDEV)
 198                 return hdlc_ioctl(dev, ifr, cmd);
 199
 200         switch(ifr->ifr_settings.type) {
 201         case IF_GET_IFACE:
 202                 ifr->ifr_settings.type = IF_IFACE_V35;
 203                 if (ifr->ifr_settings.size < size) {
 204                         ifr->ifr_settings.size = size; /* data size wanted */
 205                         return -ENOBUFS;
 206                 }
 207                 if (copy_to_user(line, &port->settings, size))
 208                         return -EFAULT;
 209                 return 0;
 210
 211         case IF_IFACE_V35:
 212         case IF_IFACE_SYNC_SERIAL:
 213                 if (!capable(CAP_NET_ADMIN))
 214                         return -EPERM;
 215
 216                 if (copy_from_user(&new_line, line, size))
 217                         return -EFAULT;
 218
 219                 if (new_line.clock_type != CLOCK_EXT &&
 220                     new_line.clock_type != CLOCK_TXFROMRX &&
 221                     new_line.clock_type != CLOCK_INT &&
 222                     new_line.clock_type != CLOCK_TXINT)
 223                         return -EINVAL; /* No such clock setting */
 224
 225                 if (new_line.loopback != 0 && new_line.loopback != 1)
 226                         return -EINVAL;
 227
 228                 memcpy(&port->settings, &new_line, size); /* Update settings */
 229                 pci200_set_iface(port);
 230                 sca_flush(port->card);
 231                 return 0;
 232
 233         default:
 234                 return hdlc_ioctl(dev, ifr, cmd);
 235         }
 236 }
 237
 238
 239
 240 static void pci200_pci_remove_one(struct pci_dev *pdev)
 241 {
 242         int i;
 243         card_t *card = pci_get_drvdata(pdev);
 244
 245         for (i = 0; i < 2; i++)
 246                 if (card->ports[i].card)
 247                         unregister_hdlc_device(card->ports[i].netdev);
 248
 249         if (card->irq)
 250                 free_irq(card->irq, card);
 251
 252         if (card->rambase)
 253                 iounmap(card->rambase);
 254         if (card->scabase)
 255                 iounmap(card->scabase);
 256         if (card->plxbase)
 257                 iounmap(card->plxbase);
 258
 259         pci_release_regions(pdev);
 260         pci_disable_device(pdev);
 261         pci_set_drvdata(pdev, NULL);
 262         if (card->ports[0].netdev)
 263                 free_netdev(card->ports[0].netdev);
 264         if (card->ports[1].netdev)
 265                 free_netdev(card->ports[1].netdev);
 266         kfree(card);
 267 }
 268
 269 static const struct net_device_ops pci200_ops = {
 270         .ndo_open       = pci200_open,
 271         .ndo_stop       = pci200_close,
 272         .ndo_change_mtu = hdlc_change_mtu,
 273         .ndo_start_xmit = hdlc_start_xmit,
 274         .ndo_do_ioctl   = pci200_ioctl,
 275 };
 276
 277 static int __devinit pci200_pci_init_one(struct pci_dev *pdev,
 278                                          const struct pci_device_id *ent)
 279 {
 280         card_t *card;
 281         u32 __iomem *p;
 282         int i;
 283         u32 ramsize;
 284         u32 ramphys;            /* buffer memory base */
 285         u32 scaphys;            /* SCA memory base */
 286         u32 plxphys;            /* PLX registers memory base */
 287
 288         i = pci_enable_device(pdev);
 289         if (i)
 290                 return i;
 291
 292         i = pci_request_regions(pdev, "PCI200SYN");
 293         if (i) {
 294                 pci_disable_device(pdev);
 295                 return i;
 296         }
 297
 298         card = kzalloc(sizeof(card_t), GFP_KERNEL);
 299         if (card == NULL) {
 300                 printk(KERN_ERR "pci200syn: unable to allocate memory\n");
 301                 pci_release_regions(pdev);
 302                 pci_disable_device(pdev);
 303                 return -ENOBUFS;
 304         }
 305         pci_set_drvdata(pdev, card);
 306         card->ports[0].netdev = alloc_hdlcdev(&card->ports[0]);
 307         card->ports[1].netdev = alloc_hdlcdev(&card->ports[1]);
 308         if (!card->ports[0].netdev || !card->ports[1].netdev) {
 309                 printk(KERN_ERR "pci200syn: unable to allocate memory\n");
 310                 pci200_pci_remove_one(pdev);
 311                 return -ENOMEM;
 312         }
 313
 314         if (pci_resource_len(pdev, 0) != PCI200SYN_PLX_SIZE ||
 315             pci_resource_len(pdev, 2) != PCI200SYN_SCA_SIZE ||
 316             pci_resource_len(pdev, 3) < 16384) {
 317                 printk(KERN_ERR "pci200syn: invalid card EEPROM parameters\n");
 318                 pci200_pci_remove_one(pdev);
 319                 return -EFAULT;
 320         }
 321
 322         plxphys = pci_resource_start(pdev,0) & PCI_BASE_ADDRESS_MEM_MASK;
 323         card->plxbase = ioremap(plxphys, PCI200SYN_PLX_SIZE);
 324
 325         scaphys = pci_resource_start(pdev,2) & PCI_BASE_ADDRESS_MEM_MASK;
 326         card->scabase = ioremap(scaphys, PCI200SYN_SCA_SIZE);
 327
 328         ramphys = pci_resource_start(pdev,3) & PCI_BASE_ADDRESS_MEM_MASK;
 329         card->rambase = pci_ioremap_bar(pdev, 3);
 330
 331         if (card->plxbase == NULL ||
 332             card->scabase == NULL ||
 333             card->rambase == NULL) {
 334                 printk(KERN_ERR "pci200syn: ioremap() failed\n");
 335                 pci200_pci_remove_one(pdev);
 336                 return -EFAULT;
 337         }
 338
 339         /* Reset PLX */
 340         p = &card->plxbase->init_ctrl;
 341         writel(readl(p) | 0x40000000, p);
 342         readl(p);               /* Flush the write - do not use sca_flush */
 343         udelay(1);
 344
 345         writel(readl(p) & ~0x40000000, p);
 346         readl(p);               /* Flush the write - do not use sca_flush */
 347         udelay(1);
 348
 349         ramsize = sca_detect_ram(card, card->rambase,
 350                                  pci_resource_len(pdev, 3));
 351
 352         /* number of TX + RX buffers for one port - this is dual port card */
 353         i = ramsize / (2 * (sizeof(pkt_desc) + HDLC_MAX_MRU));
 354         card->tx_ring_buffers = min(i / 2, MAX_TX_BUFFERS);
 355         card->rx_ring_buffers = i - card->tx_ring_buffers;
 356
 357         card->buff_offset = 2 * sizeof(pkt_desc) * (card->tx_ring_buffers +
 358                                                     card->rx_ring_buffers);
 359
 360         printk(KERN_INFO "pci200syn: %u KB RAM at 0x%x, IRQ%u, using %u TX +"
 361                " %u RX packets rings\n", ramsize / 1024, ramphys,
 362                pdev->irq, card->tx_ring_buffers, card->rx_ring_buffers);
 363
 364         if (card->tx_ring_buffers < 1) {
 365                 printk(KERN_ERR "pci200syn: RAM test failed\n");
 366                 pci200_pci_remove_one(pdev);
 367                 return -EFAULT;
 368         }
 369
 370         /* Enable interrupts on the PCI bridge */
 371         p = &card->plxbase->intr_ctrl_stat;
 372         writew(readw(p) | 0x0040, p);
 373
 374         /* Allocate IRQ */
 375         if (request_irq(pdev->irq, sca_intr, IRQF_SHARED, "pci200syn", card)) {
 376                 printk(KERN_WARNING "pci200syn: could not allocate IRQ%d.\n",
 377                        pdev->irq);
 378                 pci200_pci_remove_one(pdev);
 379                 return -EBUSY;
 380         }
 381         card->irq = pdev->irq;
 382
 383         sca_init(card, 0);
 384
 385         for (i = 0; i < 2; i++) {
 386                 port_t *port = &card->ports[i];
 387                 struct net_device *dev = port->netdev;
 388                 hdlc_device *hdlc = dev_to_hdlc(dev);
 389                 port->chan = i;
 390
 391                 spin_lock_init(&port->lock);
 392                 dev->irq = card->irq;
 393                 dev->mem_start = ramphys;
 394                 dev->mem_end = ramphys + ramsize - 1;
 395                 dev->tx_queue_len = 50;
 396                 dev->netdev_ops = &pci200_ops;
 397                 hdlc->attach = sca_attach;
 398                 hdlc->xmit = sca_xmit;
 399                 port->settings.clock_type = CLOCK_EXT;
 400                 port->card = card;
 401                 sca_init_port(port);
 402                 if (register_hdlc_device(dev)) {
 403                         printk(KERN_ERR "pci200syn: unable to register hdlc "
 404                                "device\n");
 405                         port->card = NULL;
 406                         pci200_pci_remove_one(pdev);
 407                         return -ENOBUFS;
 408                 }
 409
 410                 printk(KERN_INFO "%s: PCI200SYN channel %d\n",
 411                        dev->name, port->chan);
 412         }
 413
 414         sca_flush(card);
 415         return 0;
 416 }
 417
 418
 419
 420 static DEFINE_PCI_DEVICE_TABLE(pci200_pci_tbl) = {
 421         { PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050, PCI_VENDOR_ID_PLX,
 422           PCI_DEVICE_ID_PLX_PCI200SYN, 0, 0, 0 },
 423         { 0, }
 424 };
 425
 426
 427 static struct pci_driver pci200_pci_driver = {
 428         .name           = "PCI200SYN",
 429         .id_table       = pci200_pci_tbl,
 430         .probe          = pci200_pci_init_one,
 431         .remove         = pci200_pci_remove_one,
 432 };
 433
 434
 435 static int __init pci200_init_module(void)
 436 {
 437         if (pci_clock_freq < 1000000 || pci_clock_freq > 80000000) {
 438                 printk(KERN_ERR "pci200syn: Invalid PCI clock frequency\n");
 439                 return -EINVAL;
 440         }
 441         return pci_register_driver(&pci200_pci_driver);
 442 }
 443
 444
 445
 446 static void __exit pci200_cleanup_module(void)
 447 {
 448         pci_unregister_driver(&pci200_pci_driver);
 449 }
 450
 451 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
 452 MODULE_DESCRIPTION("Goramo PCI200SYN serial port driver");
 453 MODULE_LICENSE("GPL v2");
 454 MODULE_DEVICE_TABLE(pci, pci200_pci_tbl);
 455 module_param(pci_clock_freq, int, 0444);
 456 MODULE_PARM_DESC(pci_clock_freq, "System PCI clock frequency in Hz");
 457 module_init(pci200_init_module);
 458 module_exit(pci200_cleanup_module);