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, see <http://www.gnu.org/licenses/>.
  30  */
  31
  32 #include <linux/kernel.h>
  33 #include <linux/module.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/netdevice.h>
  36 #include <linux/delay.h>
  37 #include <linux/pci.h>
  38 #include <linux/can/dev.h>
  39 #include <linux/io.h>
  40
  41 #include "sja1000.h"
  42
  43 #define DRV_NAME  "kvaser_pci"
  44
  45 MODULE_AUTHOR("Per Dalen <per.dalen@cnw.se>");
  46 MODULE_DESCRIPTION("Socket-CAN driver for KVASER PCAN PCI cards");
  47 MODULE_SUPPORTED_DEVICE("KVASER PCAN PCI CAN card");
  48 MODULE_LICENSE("GPL v2");
  49
  50 #define MAX_NO_OF_CHANNELS        4 /* max no of channels on a single card */
  51
  52 struct kvaser_pci {
  53         int channel;
  54         struct pci_dev *pci_dev;
  55         struct net_device *slave_dev[MAX_NO_OF_CHANNELS-1];
  56         void __iomem *conf_addr;
  57         void __iomem *res_addr;
  58         int no_channels;
  59         u8 xilinx_ver;
  60 };
  61
  62 #define KVASER_PCI_CAN_CLOCK      (16000000 / 2)
  63
  64 /*
  65  * The board configuration is probably following:
  66  * RX1 is connected to ground.
  67  * TX1 is not connected.
  68  * CLKO is not connected.
  69  * Setting the OCR register to 0xDA is a good idea.
  70  * This means  normal output mode , push-pull and the correct polarity.
  71  */
  72 #define KVASER_PCI_OCR            (OCR_TX0_PUSHPULL | OCR_TX1_PUSHPULL)
  73
  74 /*
  75  * In the CDR register, you should set CBP to 1.
  76  * You will probably also want to set the clock divider value to 0
  77  * (meaning divide-by-2), the Pelican bit, and the clock-off bit
  78  * (you will have no need for CLKOUT anyway).
  79  */
  80 #define KVASER_PCI_CDR            (CDR_CBP | CDR_CLKOUT_MASK)
  81
  82 /*
  83  * These register values are valid for revision 14 of the Xilinx logic.
  84  */
  85 #define XILINX_VERINT             7   /* Lower nibble simulate interrupts,
  86                                          high nibble version number. */
  87
  88 #define XILINX_PRESUMED_VERSION   14
  89
  90 /*
  91  * Important S5920 registers
  92  */
  93 #define S5920_INTCSR              0x38
  94 #define S5920_PTCR                0x60
  95 #define INTCSR_ADDON_INTENABLE_M  0x2000
  96
  97
  98 #define KVASER_PCI_PORT_BYTES     0x20
  99
 100 #define PCI_CONFIG_PORT_SIZE      0x80      /* size of the config io-memory */
 101 #define PCI_PORT_SIZE             0x80      /* size of a channel io-memory */
 102 #define PCI_PORT_XILINX_SIZE      0x08      /* size of a xilinx io-memory */
 103
 104 #define KVASER_PCI_VENDOR_ID1     0x10e8    /* the PCI device and vendor IDs */
 105 #define KVASER_PCI_DEVICE_ID1     0x8406
 106
 107 #define KVASER_PCI_VENDOR_ID2     0x1a07    /* the PCI device and vendor IDs */
 108 #define KVASER_PCI_DEVICE_ID2     0x0008
 109
 110 static DEFINE_PCI_DEVICE_TABLE(kvaser_pci_tbl) = {
 111         {KVASER_PCI_VENDOR_ID1, KVASER_PCI_DEVICE_ID1, PCI_ANY_ID, PCI_ANY_ID,},
 112         {KVASER_PCI_VENDOR_ID2, KVASER_PCI_DEVICE_ID2, PCI_ANY_ID, PCI_ANY_ID,},
 113         { 0,}
 114 };
 115
 116 MODULE_DEVICE_TABLE(pci, kvaser_pci_tbl);
 117
 118 static u8 kvaser_pci_read_reg(const struct sja1000_priv *priv, int port)
 119 {
 120         return ioread8(priv->reg_base + port);
 121 }
 122
 123 static void kvaser_pci_write_reg(const struct sja1000_priv *priv,
 124                                  int port, u8 val)
 125 {
 126         iowrite8(val, priv->reg_base + port);
 127 }
 128
 129 static void kvaser_pci_disable_irq(struct net_device *dev)
 130 {
 131         struct sja1000_priv *priv = netdev_priv(dev);
 132         struct kvaser_pci *board = priv->priv;
 133         u32 intcsr;
 134
 135         /* Disable interrupts from card */
 136         intcsr = ioread32(board->conf_addr + S5920_INTCSR);
 137         intcsr &= ~INTCSR_ADDON_INTENABLE_M;
 138         iowrite32(intcsr, board->conf_addr + S5920_INTCSR);
 139 }
 140
 141 static void kvaser_pci_enable_irq(struct net_device *dev)
 142 {
 143         struct sja1000_priv *priv = netdev_priv(dev);
 144         struct kvaser_pci *board = priv->priv;
 145         u32 tmp_en_io;
 146
 147         /* Enable interrupts from card */
 148         tmp_en_io = ioread32(board->conf_addr + S5920_INTCSR);
 149         tmp_en_io |= INTCSR_ADDON_INTENABLE_M;
 150         iowrite32(tmp_en_io, board->conf_addr + S5920_INTCSR);
 151 }
 152
 153 static int number_of_sja1000_chip(void __iomem *base_addr)
 154 {
 155         u8 status;
 156         int i;
 157
 158         for (i = 0; i < MAX_NO_OF_CHANNELS; i++) {
 159                 /* reset chip */
 160                 iowrite8(MOD_RM, base_addr +
 161                          (i * KVASER_PCI_PORT_BYTES) + SJA1000_MOD);
 162                 status = ioread8(base_addr +
 163                                  (i * KVASER_PCI_PORT_BYTES) + SJA1000_MOD);
 164                 /* check reset bit */
 165                 if (!(status & MOD_RM))
 166                         break;
 167         }
 168
 169         return i;
 170 }
 171
 172 static void kvaser_pci_del_chan(struct net_device *dev)
 173 {
 174         struct sja1000_priv *priv;
 175         struct kvaser_pci *board;
 176         int i;
 177
 178         if (!dev)
 179                 return;
 180         priv = netdev_priv(dev);
 181         board = priv->priv;
 182         if (!board)
 183                 return;
 184
 185         dev_info(&board->pci_dev->dev, "Removing device %s\n",
 186                  dev->name);
 187
 188         /* Disable PCI interrupts */
 189         kvaser_pci_disable_irq(dev);
 190
 191         for (i = 0; i < board->no_channels - 1; i++) {
 192                 if (board->slave_dev[i]) {
 193                         dev_info(&board->pci_dev->dev, "Removing device %s\n",
 194                                  board->slave_dev[i]->name);
 195                         unregister_sja1000dev(board->slave_dev[i]);
 196                         free_sja1000dev(board->slave_dev[i]);
 197                 }
 198         }
 199         unregister_sja1000dev(dev);
 200
 201         pci_iounmap(board->pci_dev, priv->reg_base);
 202         pci_iounmap(board->pci_dev, board->conf_addr);
 203         pci_iounmap(board->pci_dev, board->res_addr);
 204
 205         free_sja1000dev(dev);
 206 }
 207
 208 static int kvaser_pci_add_chan(struct pci_dev *pdev, int channel,
 209                                struct net_device **master_dev,
 210                                void __iomem *conf_addr,
 211                                void __iomem *res_addr,
 212                                void __iomem *base_addr)
 213 {
 214         struct net_device *dev;
 215         struct sja1000_priv *priv;
 216         struct kvaser_pci *board;
 217         int err, init_step;
 218
 219         dev = alloc_sja1000dev(sizeof(struct kvaser_pci));
 220         if (dev == NULL)
 221                 return -ENOMEM;
 222
 223         priv = netdev_priv(dev);
 224         board = priv->priv;
 225
 226         board->pci_dev = pdev;
 227         board->channel = channel;
 228
 229         /* S5920 */
 230         board->conf_addr = conf_addr;
 231
 232         /* XILINX board wide address */
 233         board->res_addr = res_addr;
 234
 235         if (channel == 0) {
 236                 board->xilinx_ver =
 237                         ioread8(board->res_addr + XILINX_VERINT) >> 4;
 238                 init_step = 2;
 239
 240                 /* Assert PTADR# - we're in passive mode so the other bits are
 241                    not important */
 242                 iowrite32(0x80808080UL, board->conf_addr + S5920_PTCR);
 243
 244                 /* Enable interrupts from card */
 245                 kvaser_pci_enable_irq(dev);
 246         } else {
 247                 struct sja1000_priv *master_priv = netdev_priv(*master_dev);
 248                 struct kvaser_pci *master_board = master_priv->priv;
 249                 master_board->slave_dev[channel - 1] = dev;
 250                 master_board->no_channels = channel + 1;
 251                 board->xilinx_ver = master_board->xilinx_ver;
 252         }
 253
 254         priv->reg_base = base_addr + channel * KVASER_PCI_PORT_BYTES;
 255
 256         priv->read_reg = kvaser_pci_read_reg;
 257         priv->write_reg = kvaser_pci_write_reg;
 258
 259         priv->can.clock.freq = KVASER_PCI_CAN_CLOCK;
 260
 261         priv->ocr = KVASER_PCI_OCR;
 262         priv->cdr = KVASER_PCI_CDR;
 263
 264         priv->irq_flags = IRQF_SHARED;
 265         dev->irq = pdev->irq;
 266
 267         init_step = 4;
 268
 269         dev_info(&pdev->dev, "reg_base=%p conf_addr=%p irq=%d\n",
 270                  priv->reg_base, board->conf_addr, dev->irq);
 271
 272         SET_NETDEV_DEV(dev, &pdev->dev);
 273         dev->dev_id = channel;
 274
 275         /* Register SJA1000 device */
 276         err = register_sja1000dev(dev);
 277         if (err) {
 278                 dev_err(&pdev->dev, "Registering device failed (err=%d)\n",
 279                         err);
 280                 goto failure;
 281         }
 282
 283         if (channel == 0)
 284                 *master_dev = dev;
 285
 286         return 0;
 287
 288 failure:
 289         kvaser_pci_del_chan(dev);
 290         return err;
 291 }
 292
 293 static int kvaser_pci_init_one(struct pci_dev *pdev,
 294                                const struct pci_device_id *ent)
 295 {
 296         int err;
 297         struct net_device *master_dev = NULL;
 298         struct sja1000_priv *priv;
 299         struct kvaser_pci *board;
 300         int no_channels;
 301         void __iomem *base_addr = NULL;
 302         void __iomem *conf_addr = NULL;
 303         void __iomem *res_addr = NULL;
 304         int i;
 305
 306         dev_info(&pdev->dev, "initializing device %04x:%04x\n",
 307                  pdev->vendor, pdev->device);
 308
 309         err = pci_enable_device(pdev);
 310         if (err)
 311                 goto failure;
 312
 313         err = pci_request_regions(pdev, DRV_NAME);
 314         if (err)
 315                 goto failure_release_pci;
 316
 317         /* S5920 */
 318         conf_addr = pci_iomap(pdev, 0, PCI_CONFIG_PORT_SIZE);
 319         if (conf_addr == NULL) {
 320                 err = -ENODEV;
 321                 goto failure_release_regions;
 322         }
 323
 324         /* XILINX board wide address */
 325         res_addr = pci_iomap(pdev, 2, PCI_PORT_XILINX_SIZE);
 326         if (res_addr == NULL) {
 327                 err = -ENOMEM;
 328                 goto failure_iounmap;
 329         }
 330
 331         base_addr = pci_iomap(pdev, 1, PCI_PORT_SIZE);
 332         if (base_addr == NULL) {
 333                 err = -ENOMEM;
 334                 goto failure_iounmap;
 335         }
 336
 337         no_channels = number_of_sja1000_chip(base_addr);
 338         if (no_channels == 0) {
 339                 err = -ENOMEM;
 340                 goto failure_iounmap;
 341         }
 342
 343         for (i = 0; i < no_channels; i++) {
 344                 err = kvaser_pci_add_chan(pdev, i, &master_dev,
 345                                           conf_addr, res_addr,
 346                                           base_addr);
 347                 if (err)
 348                         goto failure_cleanup;
 349         }
 350
 351         priv = netdev_priv(master_dev);
 352         board = priv->priv;
 353
 354         dev_info(&pdev->dev, "xilinx version=%d number of channels=%d\n",
 355                  board->xilinx_ver, board->no_channels);
 356
 357         pci_set_drvdata(pdev, master_dev);
 358         return 0;
 359
 360 failure_cleanup:
 361         kvaser_pci_del_chan(master_dev);
 362
 363 failure_iounmap:
 364         if (conf_addr != NULL)
 365                 pci_iounmap(pdev, conf_addr);
 366         if (res_addr != NULL)
 367                 pci_iounmap(pdev, res_addr);
 368         if (base_addr != NULL)
 369                 pci_iounmap(pdev, base_addr);
 370
 371 failure_release_regions:
 372         pci_release_regions(pdev);
 373
 374 failure_release_pci:
 375         pci_disable_device(pdev);
 376
 377 failure:
 378         return err;
 379
 380 }
 381
 382 static void kvaser_pci_remove_one(struct pci_dev *pdev)
 383 {
 384         struct net_device *dev = pci_get_drvdata(pdev);
 385
 386         kvaser_pci_del_chan(dev);
 387
 388         pci_release_regions(pdev);
 389         pci_disable_device(pdev);
 390 }
 391
 392 static struct pci_driver kvaser_pci_driver = {
 393         .name = DRV_NAME,
 394         .id_table = kvaser_pci_tbl,
 395         .probe = kvaser_pci_init_one,
 396         .remove = kvaser_pci_remove_one,
 397 };
 398
 399 module_pci_driver(kvaser_pci_driver);