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