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); 400