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); 386