drivers/net/can/sja1000/kvaser_pci.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2008 Per Dalen <per.dalen@cnw.se>
   4  *
   5  * Parts of this software are based on (derived) the following:
   6  *
   7  * - Kvaser linux driver, version 4.72 BETA
   8  *   Copyright (C) 2002-2007 KVASER AB
   9  *
  10  * - Lincan driver, version 0.3.3, OCERA project
  11  *   Copyright (C) 2004 Pavel Pisa
  12  *   Copyright (C) 2001 Arnaud Westenberg
  13  *
  14  * - Socketcan SJA1000 drivers
  15  *   Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.com>
  16  *   Copyright (c) 2002-2007 Volkswagen Group Electronic Research
  17  *   Copyright (c) 2003 Matthias Brukner, Trajet Gmbh, Rebenring 33,
  18  *   38106 Braunschweig, GERMANY
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/netdevice.h>
  25 #include <linux/delay.h>
  26 #include <linux/pci.h>
  27 #include <linux/can/dev.h>
  28 #include <linux/io.h>
  29
  30 #include "sja1000.h"
  31
  32 #define DRV_NAME  "kvaser_pci"
  33
  34 MODULE_AUTHOR("Per Dalen <per.dalen@cnw.se>");
  35 MODULE_DESCRIPTION("Socket-CAN driver for KVASER PCAN PCI cards");
  36 MODULE_LICENSE("GPL v2");
  37
  38 #define MAX_NO_OF_CHANNELS        4 /* max no of channels on a single card */
  39
  40 struct kvaser_pci {
  41         int channel;
  42         struct pci_dev *pci_dev;
  43         struct net_device *slave_dev[MAX_NO_OF_CHANNELS-1];
  44         void __iomem *conf_addr;
  45         void __iomem *res_addr;
  46         int no_channels;
  47         u8 xilinx_ver;
  48 };
  49
  50 #define KVASER_PCI_CAN_CLOCK      (16000000 / 2)
  51
  52 /*
  53  * The board configuration is probably following:
  54  * RX1 is connected to ground.
  55  * TX1 is not connected.
  56  * CLKO is not connected.
  57  * Setting the OCR register to 0xDA is a good idea.
  58  * This means  normal output mode , push-pull and the correct polarity.
  59  */
  60 #define KVASER_PCI_OCR            (OCR_TX0_PUSHPULL | OCR_TX1_PUSHPULL)
  61
  62 /*
  63  * In the CDR register, you should set CBP to 1.
  64  * You will probably also want to set the clock divider value to 0
  65  * (meaning divide-by-2), the Pelican bit, and the clock-off bit
  66  * (you will have no need for CLKOUT anyway).
  67  */
  68 #define KVASER_PCI_CDR            (CDR_CBP | CDR_CLKOUT_MASK)
  69
  70 /*
  71  * These register values are valid for revision 14 of the Xilinx logic.
  72  */
  73 #define XILINX_VERINT             7   /* Lower nibble simulate interrupts,
  74                                          high nibble version number. */
  75
  76 #define XILINX_PRESUMED_VERSION   14
  77
  78 /*
  79  * Important S5920 registers
  80  */
  81 #define S5920_INTCSR              0x38
  82 #define S5920_PTCR                0x60
  83 #define INTCSR_ADDON_INTENABLE_M  0x2000
  84
  85
  86 #define KVASER_PCI_PORT_BYTES     0x20
  87
  88 #define PCI_CONFIG_PORT_SIZE      0x80      /* size of the config io-memory */
  89 #define PCI_PORT_SIZE             0x80      /* size of a channel io-memory */
  90 #define PCI_PORT_XILINX_SIZE      0x08      /* size of a xilinx io-memory */
  91
  92 #define KVASER_PCI_VENDOR_ID1     0x10e8    /* the PCI device and vendor IDs */
  93 #define KVASER_PCI_DEVICE_ID1     0x8406
  94
  95 #define KVASER_PCI_VENDOR_ID2     0x1a07    /* the PCI device and vendor IDs */
  96 #define KVASER_PCI_DEVICE_ID2     0x0008
  97
  98 static const struct pci_device_id kvaser_pci_tbl[] = {
  99         {KVASER_PCI_VENDOR_ID1, KVASER_PCI_DEVICE_ID1, PCI_ANY_ID, PCI_ANY_ID,},
 100         {KVASER_PCI_VENDOR_ID2, KVASER_PCI_DEVICE_ID2, PCI_ANY_ID, PCI_ANY_ID,},
 101         { 0,}
 102 };
 103
 104 MODULE_DEVICE_TABLE(pci, kvaser_pci_tbl);
 105
 106 static u8 kvaser_pci_read_reg(const struct sja1000_priv *priv, int port)
 107 {
 108         return ioread8(priv->reg_base + port);
 109 }
 110
 111 static void kvaser_pci_write_reg(const struct sja1000_priv *priv,
 112                                  int port, u8 val)
 113 {
 114         iowrite8(val, priv->reg_base + port);
 115 }
 116
 117 static void kvaser_pci_disable_irq(struct net_device *dev)
 118 {
 119         struct sja1000_priv *priv = netdev_priv(dev);
 120         struct kvaser_pci *board = priv->priv;
 121         u32 intcsr;
 122
 123         /* Disable interrupts from card */
 124         intcsr = ioread32(board->conf_addr + S5920_INTCSR);
 125         intcsr &= ~INTCSR_ADDON_INTENABLE_M;
 126         iowrite32(intcsr, board->conf_addr + S5920_INTCSR);
 127 }
 128
 129 static void kvaser_pci_enable_irq(struct net_device *dev)
 130 {
 131         struct sja1000_priv *priv = netdev_priv(dev);
 132         struct kvaser_pci *board = priv->priv;
 133         u32 tmp_en_io;
 134
 135         /* Enable interrupts from card */
 136         tmp_en_io = ioread32(board->conf_addr + S5920_INTCSR);
 137         tmp_en_io |= INTCSR_ADDON_INTENABLE_M;
 138         iowrite32(tmp_en_io, board->conf_addr + S5920_INTCSR);
 139 }
 140
 141 static int number_of_sja1000_chip(void __iomem *base_addr)
 142 {
 143         u8 status;
 144         int i;
 145
 146         for (i = 0; i < MAX_NO_OF_CHANNELS; i++) {
 147                 /* reset chip */
 148                 iowrite8(MOD_RM, base_addr +
 149                          (i * KVASER_PCI_PORT_BYTES) + SJA1000_MOD);
 150                 status = ioread8(base_addr +
 151                                  (i * KVASER_PCI_PORT_BYTES) + SJA1000_MOD);
 152                 /* check reset bit */
 153                 if (!(status & MOD_RM))
 154                         break;
 155         }
 156
 157         return i;
 158 }
 159
 160 static void kvaser_pci_del_chan(struct net_device *dev)
 161 {
 162         struct sja1000_priv *priv;
 163         struct kvaser_pci *board;
 164         int i;
 165
 166         if (!dev)
 167                 return;
 168         priv = netdev_priv(dev);
 169         board = priv->priv;
 170         if (!board)
 171                 return;
 172
 173         dev_info(&board->pci_dev->dev, "Removing device %s\n",
 174                  dev->name);
 175
 176         /* Disable PCI interrupts */
 177         kvaser_pci_disable_irq(dev);
 178
 179         for (i = 0; i < board->no_channels - 1; i++) {
 180                 if (board->slave_dev[i]) {
 181                         dev_info(&board->pci_dev->dev, "Removing device %s\n",
 182                                  board->slave_dev[i]->name);
 183                         unregister_sja1000dev(board->slave_dev[i]);
 184                         free_sja1000dev(board->slave_dev[i]);
 185                 }
 186         }
 187         unregister_sja1000dev(dev);
 188
 189         pci_iounmap(board->pci_dev, priv->reg_base);
 190         pci_iounmap(board->pci_dev, board->conf_addr);
 191         pci_iounmap(board->pci_dev, board->res_addr);
 192
 193         free_sja1000dev(dev);
 194 }
 195
 196 static int kvaser_pci_add_chan(struct pci_dev *pdev, int channel,
 197                                struct net_device **master_dev,
 198                                void __iomem *conf_addr,
 199                                void __iomem *res_addr,
 200                                void __iomem *base_addr)
 201 {
 202         struct net_device *dev;
 203         struct sja1000_priv *priv;
 204         struct kvaser_pci *board;
 205         int err;
 206
 207         dev = alloc_sja1000dev(sizeof(struct kvaser_pci));
 208         if (dev == NULL)
 209                 return -ENOMEM;
 210
 211         priv = netdev_priv(dev);
 212         board = priv->priv;
 213
 214         board->pci_dev = pdev;
 215         board->channel = channel;
 216
 217         /* S5920 */
 218         board->conf_addr = conf_addr;
 219
 220         /* XILINX board wide address */
 221         board->res_addr = res_addr;
 222
 223         if (channel == 0) {
 224                 board->xilinx_ver =
 225                         ioread8(board->res_addr + XILINX_VERINT) >> 4;
 226
 227                 /* Assert PTADR# - we're in passive mode so the other bits are
 228                    not important */
 229                 iowrite32(0x80808080UL, board->conf_addr + S5920_PTCR);
 230
 231                 /* Enable interrupts from card */
 232                 kvaser_pci_enable_irq(dev);
 233         } else {
 234                 struct sja1000_priv *master_priv = netdev_priv(*master_dev);
 235                 struct kvaser_pci *master_board = master_priv->priv;
 236                 master_board->slave_dev[channel - 1] = dev;
 237                 master_board->no_channels = channel + 1;
 238                 board->xilinx_ver = master_board->xilinx_ver;
 239         }
 240
 241         priv->reg_base = base_addr + channel * KVASER_PCI_PORT_BYTES;
 242
 243         priv->read_reg = kvaser_pci_read_reg;
 244         priv->write_reg = kvaser_pci_write_reg;
 245
 246         priv->can.clock.freq = KVASER_PCI_CAN_CLOCK;
 247
 248         priv->ocr = KVASER_PCI_OCR;
 249         priv->cdr = KVASER_PCI_CDR;
 250
 251         priv->irq_flags = IRQF_SHARED;
 252         dev->irq = pdev->irq;
 253
 254         dev_info(&pdev->dev, "reg_base=%p conf_addr=%p irq=%d\n",
 255                  priv->reg_base, board->conf_addr, dev->irq);
 256
 257         SET_NETDEV_DEV(dev, &pdev->dev);
 258         dev->dev_id = channel;
 259
 260         /* Register SJA1000 device */
 261         err = register_sja1000dev(dev);
 262         if (err) {
 263                 dev_err(&pdev->dev, "Registering device failed (err=%d)\n",
 264                         err);
 265                 goto failure;
 266         }
 267
 268         if (channel == 0)
 269                 *master_dev = dev;
 270
 271         return 0;
 272
 273 failure:
 274         kvaser_pci_del_chan(dev);
 275         return err;
 276 }
 277
 278 static int kvaser_pci_init_one(struct pci_dev *pdev,
 279                                const struct pci_device_id *ent)
 280 {
 281         int err;
 282         struct net_device *master_dev = NULL;
 283         struct sja1000_priv *priv;
 284         struct kvaser_pci *board;
 285         int no_channels;
 286         void __iomem *base_addr = NULL;
 287         void __iomem *conf_addr = NULL;
 288         void __iomem *res_addr = NULL;
 289         int i;
 290
 291         dev_info(&pdev->dev, "initializing device %04x:%04x\n",
 292                  pdev->vendor, pdev->device);
 293
 294         err = pci_enable_device(pdev);
 295         if (err)
 296                 goto failure;
 297
 298         err = pci_request_regions(pdev, DRV_NAME);
 299         if (err)
 300                 goto failure_release_pci;
 301
 302         /* S5920 */
 303         conf_addr = pci_iomap(pdev, 0, PCI_CONFIG_PORT_SIZE);
 304         if (conf_addr == NULL) {
 305                 err = -ENODEV;
 306                 goto failure_release_regions;
 307         }
 308
 309         /* XILINX board wide address */
 310         res_addr = pci_iomap(pdev, 2, PCI_PORT_XILINX_SIZE);
 311         if (res_addr == NULL) {
 312                 err = -ENOMEM;
 313                 goto failure_iounmap;
 314         }
 315
 316         base_addr = pci_iomap(pdev, 1, PCI_PORT_SIZE);
 317         if (base_addr == NULL) {
 318                 err = -ENOMEM;
 319                 goto failure_iounmap;
 320         }
 321
 322         no_channels = number_of_sja1000_chip(base_addr);
 323         if (no_channels == 0) {
 324                 err = -ENOMEM;
 325                 goto failure_iounmap;
 326         }
 327
 328         for (i = 0; i < no_channels; i++) {
 329                 err = kvaser_pci_add_chan(pdev, i, &master_dev,
 330                                           conf_addr, res_addr,
 331                                           base_addr);
 332                 if (err)
 333                         goto failure_cleanup;
 334         }
 335
 336         priv = netdev_priv(master_dev);
 337         board = priv->priv;
 338
 339         dev_info(&pdev->dev, "xilinx version=%d number of channels=%d\n",
 340                  board->xilinx_ver, board->no_channels);
 341
 342         pci_set_drvdata(pdev, master_dev);
 343         return 0;
 344
 345 failure_cleanup:
 346         kvaser_pci_del_chan(master_dev);
 347
 348 failure_iounmap:
 349         if (conf_addr != NULL)
 350                 pci_iounmap(pdev, conf_addr);
 351         if (res_addr != NULL)
 352                 pci_iounmap(pdev, res_addr);
 353         if (base_addr != NULL)
 354                 pci_iounmap(pdev, base_addr);
 355
 356 failure_release_regions:
 357         pci_release_regions(pdev);
 358
 359 failure_release_pci:
 360         pci_disable_device(pdev);
 361
 362 failure:
 363         return err;
 364
 365 }
 366
 367 static void kvaser_pci_remove_one(struct pci_dev *pdev)
 368 {
 369         struct net_device *dev = pci_get_drvdata(pdev);
 370
 371         kvaser_pci_del_chan(dev);
 372
 373         pci_release_regions(pdev);
 374         pci_disable_device(pdev);
 375 }
 376
 377 static struct pci_driver kvaser_pci_driver = {
 378         .name = DRV_NAME,
 379         .id_table = kvaser_pci_tbl,
 380         .probe = kvaser_pci_init_one,
 381         .remove = kvaser_pci_remove_one,
 382 };
 383
 384 module_pci_driver(kvaser_pci_driver);