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); 385