drivers/net/can/sja1000/kvaser_pci.c

   1 /*
   2  * Copyright (C) 2008 Per Dalen <per.dalen@cnw.se>
   3  *
   4  * Parts of this software are based on (derived) the following:
   5  *
   6  * - Kvaser linux driver, version 4.72 BETA
   7  *   Copyright (C) 2002-2007 KVASER AB
   8  *
   9  * - Lincan driver, version 0.3.3, OCERA project
  10  *   Copyright (C) 2004 Pavel Pisa
  11  *   Copyright (C) 2001 Arnaud Westenberg
  12  *
  13  * - Socketcan SJA1000 drivers
  14  *   Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.com>
  15  *   Copyright (c) 2002-2007 Volkswagen Group Electronic Research
  16  *   Copyright (c) 2003 Matthias Brukner, Trajet Gmbh, Rebenring 33,
  17  *   38106 Braunschweig, GERMANY
  18  *
  19  * This program is free software; you can redistribute it and/or modify
  20  * it under the terms of the version 2 of the GNU General Public License
  21  * as published by the Free Software Foundation
  22  *
  23  * This program is distributed in the hope that it will be useful, but
  24  * WITHOUT ANY WARRANTY; without even the implied warranty of
  25  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  26  * General Public License for more details.
  27  *
  28  * You should have received a copy of the GNU General Public License
  29  * along with this program; if not, write to the Free Software Foundation,
  30  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  31  */
  32
  33 #include <linux/kernel.h>
  34 #include <linux/module.h>
  35 #include <linux/interrupt.h>
  36 #include <linux/netdevice.h>
  37 #include <linux/delay.h>
  38 #include <linux/pci.h>
  39 #include <linux/can.h>
  40 #include <linux/can/dev.h>
  41 #include <linux/io.h>
  42
  43 #include "sja1000.h"
  44
  45 #define DRV_NAME  "kvaser_pci"
  46
  47 MODULE_AUTHOR("Per Dalen <per.dalen@cnw.se>");
  48 MODULE_DESCRIPTION("Socket-CAN driver for KVASER PCAN PCI cards");
  49 MODULE_SUPPORTED_DEVICE("KVASER PCAN PCI CAN card");
  50 MODULE_LICENSE("GPL v2");
  51
  52 #define MAX_NO_OF_CHANNELS        4 /* max no of channels on a single card */
  53
  54 struct kvaser_pci {
  55         int channel;
  56         struct pci_dev *pci_dev;
  57         struct net_device *slave_dev[MAX_NO_OF_CHANNELS-1];
  58         void __iomem *conf_addr;
  59         void __iomem *res_addr;
  60         int no_channels;
  61         u8 xilinx_ver;
  62 };
  63
  64 #define KVASER_PCI_CAN_CLOCK      (16000000 / 2)
  65
  66 /*
  67  * The board configuration is probably following:
  68  * RX1 is connected to ground.
  69  * TX1 is not connected.
  70  * CLKO is not connected.
  71  * Setting the OCR register to 0xDA is a good idea.
  72  * This means  normal output mode , push-pull and the correct polarity.
  73  */
  74 #define KVASER_PCI_OCR            (OCR_TX0_PUSHPULL | OCR_TX1_PUSHPULL)
  75
  76 /*
  77  * In the CDR register, you should set CBP to 1.
  78  * You will probably also want to set the clock divider value to 0
  79  * (meaning divide-by-2), the Pelican bit, and the clock-off bit
  80  * (you will have no need for CLKOUT anyway).
  81  */
  82 #define KVASER_PCI_CDR            (CDR_CBP | CDR_CLKOUT_MASK)
  83
  84 /*
  85  * These register values are valid for revision 14 of the Xilinx logic.
  86  */
  87 #define XILINX_VERINT             7   /* Lower nibble simulate interrupts,
  88                                          high nibble version number. */
  89
  90 #define XILINX_PRESUMED_VERSION   14
  91
  92 /*
  93  * Important S5920 registers
  94  */
  95 #define S5920_INTCSR              0x38
  96 #define S5920_PTCR                0x60
  97 #define INTCSR_ADDON_INTENABLE_M  0x2000
  98
  99
 100 #define KVASER_PCI_PORT_BYTES     0x20
 101
 102 #define PCI_CONFIG_PORT_SIZE      0x80      /* size of the config io-memory */
 103 #define PCI_PORT_SIZE             0x80      /* size of a channel io-memory */
 104 #define PCI_PORT_XILINX_SIZE      0x08      /* size of a xilinx io-memory */
 105
 106 #define KVASER_PCI_VENDOR_ID1     0x10e8    /* the PCI device and vendor IDs */
 107 #define KVASER_PCI_DEVICE_ID1     0x8406
 108
 109 #define KVASER_PCI_VENDOR_ID2     0x1a07    /* the PCI device and vendor IDs */
 110 #define KVASER_PCI_DEVICE_ID2     0x0008
 111
 112 static DEFINE_PCI_DEVICE_TABLE(kvaser_pci_tbl) = {
 113         {KVASER_PCI_VENDOR_ID1, KVASER_PCI_DEVICE_ID1, PCI_ANY_ID, PCI_ANY_ID,},
 114         {KVASER_PCI_VENDOR_ID2, KVASER_PCI_DEVICE_ID2, PCI_ANY_ID, PCI_ANY_ID,},
 115         { 0,}
 116 };
 117
 118 MODULE_DEVICE_TABLE(pci, kvaser_pci_tbl);
 119
 120 static u8 kvaser_pci_read_reg(const struct sja1000_priv *priv, int port)
 121 {
 122         return ioread8(priv->reg_base + port);
 123 }
 124
 125 static void kvaser_pci_write_reg(const struct sja1000_priv *priv,
 126                                  int port, u8 val)
 127 {
 128         iowrite8(val, priv->reg_base + port);
 129 }
 130
 131 static void kvaser_pci_disable_irq(struct net_device *dev)
 132 {
 133         struct sja1000_priv *priv = netdev_priv(dev);
 134         struct kvaser_pci *board = priv->priv;
 135         u32 intcsr;
 136
 137         /* Disable interrupts from card */
 138         intcsr = ioread32(board->conf_addr + S5920_INTCSR);
 139         intcsr &= ~INTCSR_ADDON_INTENABLE_M;
 140         iowrite32(intcsr, board->conf_addr + S5920_INTCSR);
 141 }
 142
 143 static void kvaser_pci_enable_irq(struct net_device *dev)
 144 {
 145         struct sja1000_priv *priv = netdev_priv(dev);
 146         struct kvaser_pci *board = priv->priv;
 147         u32 tmp_en_io;
 148
 149         /* Enable interrupts from card */
 150         tmp_en_io = ioread32(board->conf_addr + S5920_INTCSR);
 151         tmp_en_io |= INTCSR_ADDON_INTENABLE_M;
 152         iowrite32(tmp_en_io, board->conf_addr + S5920_INTCSR);
 153 }
 154
 155 static int number_of_sja1000_chip(void __iomem *base_addr)
 156 {
 157         u8 status;
 158         int i;
 159
 160         for (i = 0; i < MAX_NO_OF_CHANNELS; i++) {
 161                 /* reset chip */
 162                 iowrite8(MOD_RM, base_addr +
 163                          (i * KVASER_PCI_PORT_BYTES) + REG_MOD);
 164                 status = ioread8(base_addr +
 165                                  (i * KVASER_PCI_PORT_BYTES) + REG_MOD);
 166                 /* check reset bit */
 167                 if (!(status & MOD_RM))
 168                         break;
 169         }
 170
 171         return i;
 172 }
 173
 174 static void kvaser_pci_del_chan(struct net_device *dev)
 175 {
 176         struct sja1000_priv *priv;
 177         struct kvaser_pci *board;
 178         int i;
 179
 180         if (!dev)
 181                 return;
 182         priv = netdev_priv(dev);
 183         board = priv->priv;
 184         if (!board)
 185                 return;
 186
 187         dev_info(&board->pci_dev->dev, "Removing device %s\n",
 188                  dev->name);
 189
 190         /* Disable PCI interrupts */
 191         kvaser_pci_disable_irq(dev);
 192
 193         for (i = 0; i < board->no_channels - 1; i++) {
 194                 if (board->slave_dev[i]) {
 195                         dev_info(&board->pci_dev->dev, "Removing device %s\n",
 196                                  board->slave_dev[i]->name);
 197                         unregister_sja1000dev(board->slave_dev[i]);
 198                         free_sja1000dev(board->slave_dev[i]);
 199                 }
 200         }
 201         unregister_sja1000dev(dev);
 202
 203         pci_iounmap(board->pci_dev, priv->reg_base);
 204         pci_iounmap(board->pci_dev, board->conf_addr);
 205         pci_iounmap(board->pci_dev, board->res_addr);
 206
 207         free_sja1000dev(dev);
 208 }
 209
 210 static int kvaser_pci_add_chan(struct pci_dev *pdev, int channel,
 211                                struct net_device **master_dev,
 212                                void __iomem *conf_addr,
 213                                void __iomem *res_addr,
 214                                void __iomem *base_addr)
 215 {
 216         struct net_device *dev;
 217         struct sja1000_priv *priv;
 218         struct kvaser_pci *board;
 219         int err, init_step;
 220
 221         dev = alloc_sja1000dev(sizeof(struct kvaser_pci));
 222         if (dev == NULL)
 223                 return -ENOMEM;
 224
 225         priv = netdev_priv(dev);
 226         board = priv->priv;
 227
 228         board->pci_dev = pdev;
 229         board->channel = channel;
 230
 231         /* S5920 */
 232         board->conf_addr = conf_addr;
 233
 234         /* XILINX board wide address */
 235         board->res_addr = res_addr;
 236
 237         if (channel == 0) {
 238                 board->xilinx_ver =
 239                         ioread8(board->res_addr + XILINX_VERINT) >> 4;
 240                 init_step = 2;
 241
 242                 /* Assert PTADR# - we're in passive mode so the other bits are
 243                    not important */
 244                 iowrite32(0x80808080UL, board->conf_addr + S5920_PTCR);
 245
 246                 /* Enable interrupts from card */
 247                 kvaser_pci_enable_irq(dev);
 248         } else {
 249                 struct sja1000_priv *master_priv = netdev_priv(*master_dev);
 250                 struct kvaser_pci *master_board = master_priv->priv;
 251                 master_board->slave_dev[channel - 1] = dev;
 252                 master_board->no_channels = channel + 1;
 253                 board->xilinx_ver = master_board->xilinx_ver;
 254         }
 255
 256         priv->reg_base = base_addr + channel * KVASER_PCI_PORT_BYTES;
 257
 258         priv->read_reg = kvaser_pci_read_reg;
 259         priv->write_reg = kvaser_pci_write_reg;
 260
 261         priv->can.clock.freq = KVASER_PCI_CAN_CLOCK;
 262
 263         priv->ocr = KVASER_PCI_OCR;
 264         priv->cdr = KVASER_PCI_CDR;
 265
 266         priv->irq_flags = IRQF_SHARED;
 267         dev->irq = pdev->irq;
 268
 269         init_step = 4;
 270
 271         dev_info(&pdev->dev, "reg_base=%p conf_addr=%p irq=%d\n",
 272                  priv->reg_base, board->conf_addr, dev->irq);
 273
 274         SET_NETDEV_DEV(dev, &pdev->dev);
 275
 276         /* Register SJA1000 device */
 277         err = register_sja1000dev(dev);
 278         if (err) {
 279                 dev_err(&pdev->dev, "Registering device failed (err=%d)\n",
 280                         err);
 281                 goto failure;
 282         }
 283
 284         if (channel == 0)
 285                 *master_dev = dev;
 286
 287         return 0;
 288
 289 failure:
 290         kvaser_pci_del_chan(dev);
 291         return err;
 292 }
 293
 294 static int __devinit kvaser_pci_init_one(struct pci_dev *pdev,
 295                                          const struct pci_device_id *ent)
 296 {
 297         int err;
 298         struct net_device *master_dev = NULL;
 299         struct sja1000_priv *priv;
 300         struct kvaser_pci *board;
 301         int no_channels;
 302         void __iomem *base_addr = NULL;
 303         void __iomem *conf_addr = NULL;
 304         void __iomem *res_addr = NULL;
 305         int i;
 306
 307         dev_info(&pdev->dev, "initializing device %04x:%04x\n",
 308                  pdev->vendor, pdev->device);
 309
 310         err = pci_enable_device(pdev);
 311         if (err)
 312                 goto failure;
 313
 314         err = pci_request_regions(pdev, DRV_NAME);
 315         if (err)
 316                 goto failure_release_pci;
 317
 318         /* S5920 */
 319         conf_addr = pci_iomap(pdev, 0, PCI_CONFIG_PORT_SIZE);
 320         if (conf_addr == NULL) {
 321                 err = -ENODEV;
 322                 goto failure_release_regions;
 323         }
 324
 325         /* XILINX board wide address */
 326         res_addr = pci_iomap(pdev, 2, PCI_PORT_XILINX_SIZE);
 327         if (res_addr == NULL) {
 328                 err = -ENOMEM;
 329                 goto failure_iounmap;
 330         }
 331
 332         base_addr = pci_iomap(pdev, 1, PCI_PORT_SIZE);
 333         if (base_addr == NULL) {
 334                 err = -ENOMEM;
 335                 goto failure_iounmap;
 336         }
 337
 338         no_channels = number_of_sja1000_chip(base_addr);
 339         if (no_channels == 0) {
 340                 err = -ENOMEM;
 341                 goto failure_iounmap;
 342         }
 343
 344         for (i = 0; i < no_channels; i++) {
 345                 err = kvaser_pci_add_chan(pdev, i, &master_dev,
 346                                           conf_addr, res_addr,
 347                                           base_addr);
 348                 if (err)
 349                         goto failure_cleanup;
 350         }
 351
 352         priv = netdev_priv(master_dev);
 353         board = priv->priv;
 354
 355         dev_info(&pdev->dev, "xilinx version=%d number of channels=%d\n",
 356                  board->xilinx_ver, board->no_channels);
 357
 358         pci_set_drvdata(pdev, master_dev);
 359         return 0;
 360
 361 failure_cleanup:
 362         kvaser_pci_del_chan(master_dev);
 363
 364 failure_iounmap:
 365         if (conf_addr != NULL)
 366                 pci_iounmap(pdev, conf_addr);
 367         if (res_addr != NULL)
 368                 pci_iounmap(pdev, res_addr);
 369         if (base_addr != NULL)
 370                 pci_iounmap(pdev, base_addr);
 371
 372 failure_release_regions:
 373         pci_release_regions(pdev);
 374
 375 failure_release_pci:
 376         pci_disable_device(pdev);
 377
 378 failure:
 379         return err;
 380
 381 }
 382
 383 static void __devexit kvaser_pci_remove_one(struct pci_dev *pdev)
 384 {
 385         struct net_device *dev = pci_get_drvdata(pdev);
 386
 387         kvaser_pci_del_chan(dev);
 388
 389         pci_release_regions(pdev);
 390         pci_disable_device(pdev);
 391         pci_set_drvdata(pdev, NULL);
 392 }
 393
 394 static struct pci_driver kvaser_pci_driver = {
 395         .name = DRV_NAME,
 396         .id_table = kvaser_pci_tbl,
 397         .probe = kvaser_pci_init_one,
 398         .remove = __devexit_p(kvaser_pci_remove_one),
 399 };
 400
 401 static int __init kvaser_pci_init(void)
 402 {
 403         return pci_register_driver(&kvaser_pci_driver);
 404 }
 405
 406 static void __exit kvaser_pci_exit(void)
 407 {
 408         pci_unregister_driver(&kvaser_pci_driver);
 409 }
 410
 411 module_init(kvaser_pci_init);
 412 module_exit(kvaser_pci_exit);