1 /* 2 * Copyright (C) 2007, 2011 Wolfgang Grandegger <wg@grandegger.com> 3 * Copyright (C) 2012 Stephane Grosjean <s.grosjean@peak-system.com> 4 * 5 * Derived from the PCAN project file driver/src/pcan_pci.c: 6 * 7 * Copyright (C) 2001-2006 PEAK System-Technik GmbH 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the version 2 of the GNU General Public License 11 * as published by the Free Software Foundation 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 */ 18 19 #include <linux/kernel.h> 20 #include <linux/module.h> 21 #include <linux/interrupt.h> 22 #include <linux/netdevice.h> 23 #include <linux/delay.h> 24 #include <linux/pci.h> 25 #include <linux/io.h> 26 #include <linux/i2c.h> 27 #include <linux/i2c-algo-bit.h> 28 #include <linux/can.h> 29 #include <linux/can/dev.h> 30 31 #include "sja1000.h" 32 33 MODULE_AUTHOR("Stephane Grosjean <s.grosjean@peak-system.com>"); 34 MODULE_DESCRIPTION("Socket-CAN driver for PEAK PCAN PCI family cards"); 35 MODULE_SUPPORTED_DEVICE("PEAK PCAN PCI/PCIe/PCIeC miniPCI CAN cards"); 36 MODULE_SUPPORTED_DEVICE("PEAK PCAN miniPCIe/cPCI PC/104+ PCI/104e CAN Cards"); 37 MODULE_LICENSE("GPL v2"); 38 39 #define DRV_NAME "peak_pci" 40 41 struct peak_pciec_card; 42 struct peak_pci_chan { 43 void __iomem *cfg_base; /* Common for all channels */ 44 struct net_device *prev_dev; /* Chain of network devices */ 45 u16 icr_mask; /* Interrupt mask for fast ack */ 46 struct peak_pciec_card *pciec_card; /* only for PCIeC LEDs */ 47 }; 48 49 #define PEAK_PCI_CAN_CLOCK (16000000 / 2) 50 51 #define PEAK_PCI_CDR (CDR_CBP | CDR_CLKOUT_MASK) 52 #define PEAK_PCI_OCR OCR_TX0_PUSHPULL 53 54 /* 55 * Important PITA registers 56 */ 57 #define PITA_ICR 0x00 /* Interrupt control register */ 58 #define PITA_GPIOICR 0x18 /* GPIO interface control register */ 59 #define PITA_MISC 0x1C /* Miscellaneous register */ 60 61 #define PEAK_PCI_CFG_SIZE 0x1000 /* Size of the config PCI bar */ 62 #define PEAK_PCI_CHAN_SIZE 0x0400 /* Size used by the channel */ 63 64 #define PEAK_PCI_VENDOR_ID 0x001C /* The PCI device and vendor IDs */ 65 #define PEAK_PCI_DEVICE_ID 0x0001 /* for PCI/PCIe slot cards */ 66 #define PEAK_PCIEC_DEVICE_ID 0x0002 /* for ExpressCard slot cards */ 67 #define PEAK_PCIE_DEVICE_ID 0x0003 /* for nextgen PCIe slot cards */ 68 #define PEAK_CPCI_DEVICE_ID 0x0004 /* for nextgen cPCI slot cards */ 69 #define PEAK_MPCI_DEVICE_ID 0x0005 /* for nextgen miniPCI slot cards */ 70 #define PEAK_PC_104P_DEVICE_ID 0x0006 /* PCAN-PC/104+ cards */ 71 #define PEAK_PCI_104E_DEVICE_ID 0x0007 /* PCAN-PCI/104 Express cards */ 72 #define PEAK_MPCIE_DEVICE_ID 0x0008 /* The miniPCIe slot cards */ 73 #define PEAK_PCIE_OEM_ID 0x0009 /* PCAN-PCI Express OEM */ 74 #define PEAK_PCIEC34_DEVICE_ID 0x000A /* PCAN-PCI Express 34 (one channel) */ 75 76 #define PEAK_PCI_CHAN_MAX 4 77 78 static const u16 peak_pci_icr_masks[PEAK_PCI_CHAN_MAX] = { 79 0x02, 0x01, 0x40, 0x80 80 }; 81 82 static const struct pci_device_id peak_pci_tbl[] = { 83 {PEAK_PCI_VENDOR_ID, PEAK_PCI_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, 84 {PEAK_PCI_VENDOR_ID, PEAK_PCIE_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, 85 {PEAK_PCI_VENDOR_ID, PEAK_MPCI_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, 86 {PEAK_PCI_VENDOR_ID, PEAK_MPCIE_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, 87 {PEAK_PCI_VENDOR_ID, PEAK_PC_104P_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, 88 {PEAK_PCI_VENDOR_ID, PEAK_PCI_104E_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, 89 {PEAK_PCI_VENDOR_ID, PEAK_CPCI_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, 90 {PEAK_PCI_VENDOR_ID, PEAK_PCIE_OEM_ID, PCI_ANY_ID, PCI_ANY_ID,}, 91 #ifdef CONFIG_CAN_PEAK_PCIEC 92 {PEAK_PCI_VENDOR_ID, PEAK_PCIEC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, 93 {PEAK_PCI_VENDOR_ID, PEAK_PCIEC34_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, 94 #endif 95 {0,} 96 }; 97 98 MODULE_DEVICE_TABLE(pci, peak_pci_tbl); 99 100 #ifdef CONFIG_CAN_PEAK_PCIEC 101 /* 102 * PCAN-ExpressCard needs I2C bit-banging configuration option. 103 */ 104 105 /* GPIOICR byte access offsets */ 106 #define PITA_GPOUT 0x18 /* GPx output value */ 107 #define PITA_GPIN 0x19 /* GPx input value */ 108 #define PITA_GPOEN 0x1A /* configure GPx as ouput pin */ 109 110 /* I2C GP bits */ 111 #define PITA_GPIN_SCL 0x01 /* Serial Clock Line */ 112 #define PITA_GPIN_SDA 0x04 /* Serial DAta line */ 113 114 #define PCA9553_1_SLAVEADDR (0xC4 >> 1) 115 116 /* PCA9553 LS0 fields values */ 117 enum { 118 PCA9553_LOW, 119 PCA9553_HIGHZ, 120 PCA9553_PWM0, 121 PCA9553_PWM1 122 }; 123 124 /* LEDs control */ 125 #define PCA9553_ON PCA9553_LOW 126 #define PCA9553_OFF PCA9553_HIGHZ 127 #define PCA9553_SLOW PCA9553_PWM0 128 #define PCA9553_FAST PCA9553_PWM1 129 130 #define PCA9553_LED(c) (1 << (c)) 131 #define PCA9553_LED_STATE(s, c) ((s) << ((c) << 1)) 132 133 #define PCA9553_LED_ON(c) PCA9553_LED_STATE(PCA9553_ON, c) 134 #define PCA9553_LED_OFF(c) PCA9553_LED_STATE(PCA9553_OFF, c) 135 #define PCA9553_LED_SLOW(c) PCA9553_LED_STATE(PCA9553_SLOW, c) 136 #define PCA9553_LED_FAST(c) PCA9553_LED_STATE(PCA9553_FAST, c) 137 #define PCA9553_LED_MASK(c) PCA9553_LED_STATE(0x03, c) 138 139 #define PCA9553_LED_OFF_ALL (PCA9553_LED_OFF(0) | PCA9553_LED_OFF(1)) 140 141 #define PCA9553_LS0_INIT 0x40 /* initial value (!= from 0x00) */ 142 143 struct peak_pciec_chan { 144 struct net_device *netdev; 145 unsigned long prev_rx_bytes; 146 unsigned long prev_tx_bytes; 147 }; 148 149 struct peak_pciec_card { 150 void __iomem *cfg_base; /* Common for all channels */ 151 void __iomem *reg_base; /* first channel base address */ 152 u8 led_cache; /* leds state cache */ 153 154 /* PCIExpressCard i2c data */ 155 struct i2c_algo_bit_data i2c_bit; 156 struct i2c_adapter led_chip; 157 struct delayed_work led_work; /* led delayed work */ 158 int chan_count; 159 struct peak_pciec_chan channel[PEAK_PCI_CHAN_MAX]; 160 }; 161 162 /* "normal" pci register write callback is overloaded for leds control */ 163 static void peak_pci_write_reg(const struct sja1000_priv *priv, 164 int port, u8 val); 165 166 static inline void pita_set_scl_highz(struct peak_pciec_card *card) 167 { 168 u8 gp_outen = readb(card->cfg_base + PITA_GPOEN) & ~PITA_GPIN_SCL; 169 writeb(gp_outen, card->cfg_base + PITA_GPOEN); 170 } 171 172 static inline void pita_set_sda_highz(struct peak_pciec_card *card) 173 { 174 u8 gp_outen = readb(card->cfg_base + PITA_GPOEN) & ~PITA_GPIN_SDA; 175 writeb(gp_outen, card->cfg_base + PITA_GPOEN); 176 } 177 178 static void peak_pciec_init_pita_gpio(struct peak_pciec_card *card) 179 { 180 /* raise SCL & SDA GPIOs to high-Z */ 181 pita_set_scl_highz(card); 182 pita_set_sda_highz(card); 183 } 184 185 static void pita_setsda(void *data, int state) 186 { 187 struct peak_pciec_card *card = (struct peak_pciec_card *)data; 188 u8 gp_out, gp_outen; 189 190 /* set output sda always to 0 */ 191 gp_out = readb(card->cfg_base + PITA_GPOUT) & ~PITA_GPIN_SDA; 192 writeb(gp_out, card->cfg_base + PITA_GPOUT); 193 194 /* control output sda with GPOEN */ 195 gp_outen = readb(card->cfg_base + PITA_GPOEN); 196 if (state) 197 gp_outen &= ~PITA_GPIN_SDA; 198 else 199 gp_outen |= PITA_GPIN_SDA; 200 201 writeb(gp_outen, card->cfg_base + PITA_GPOEN); 202 } 203 204 static void pita_setscl(void *data, int state) 205 { 206 struct peak_pciec_card *card = (struct peak_pciec_card *)data; 207 u8 gp_out, gp_outen; 208 209 /* set output scl always to 0 */ 210 gp_out = readb(card->cfg_base + PITA_GPOUT) & ~PITA_GPIN_SCL; 211 writeb(gp_out, card->cfg_base + PITA_GPOUT); 212 213 /* control output scl with GPOEN */ 214 gp_outen = readb(card->cfg_base + PITA_GPOEN); 215 if (state) 216 gp_outen &= ~PITA_GPIN_SCL; 217 else 218 gp_outen |= PITA_GPIN_SCL; 219 220 writeb(gp_outen, card->cfg_base + PITA_GPOEN); 221 } 222 223 static int pita_getsda(void *data) 224 { 225 struct peak_pciec_card *card = (struct peak_pciec_card *)data; 226 227 /* set tristate */ 228 pita_set_sda_highz(card); 229 230 return (readb(card->cfg_base + PITA_GPIN) & PITA_GPIN_SDA) ? 1 : 0; 231 } 232 233 static int pita_getscl(void *data) 234 { 235 struct peak_pciec_card *card = (struct peak_pciec_card *)data; 236 237 /* set tristate */ 238 pita_set_scl_highz(card); 239 240 return (readb(card->cfg_base + PITA_GPIN) & PITA_GPIN_SCL) ? 1 : 0; 241 } 242 243 /* 244 * write commands to the LED chip though the I2C-bus of the PCAN-PCIeC 245 */ 246 static int peak_pciec_write_pca9553(struct peak_pciec_card *card, 247 u8 offset, u8 data) 248 { 249 u8 buffer[2] = { 250 offset, 251 data 252 }; 253 struct i2c_msg msg = { 254 .addr = PCA9553_1_SLAVEADDR, 255 .len = 2, 256 .buf = buffer, 257 }; 258 int ret; 259 260 /* cache led mask */ 261 if ((offset == 5) && (data == card->led_cache)) 262 return 0; 263 264 ret = i2c_transfer(&card->led_chip, &msg, 1); 265 if (ret < 0) 266 return ret; 267 268 if (offset == 5) 269 card->led_cache = data; 270 271 return 0; 272 } 273 274 /* 275 * delayed work callback used to control the LEDs 276 */ 277 static void peak_pciec_led_work(struct work_struct *work) 278 { 279 struct peak_pciec_card *card = 280 container_of(work, struct peak_pciec_card, led_work.work); 281 struct net_device *netdev; 282 u8 new_led = card->led_cache; 283 int i, up_count = 0; 284 285 /* first check what is to do */ 286 for (i = 0; i < card->chan_count; i++) { 287 /* default is: not configured */ 288 new_led &= ~PCA9553_LED_MASK(i); 289 new_led |= PCA9553_LED_ON(i); 290 291 netdev = card->channel[i].netdev; 292 if (!netdev || !(netdev->flags & IFF_UP)) 293 continue; 294 295 up_count++; 296 297 /* no activity (but configured) */ 298 new_led &= ~PCA9553_LED_MASK(i); 299 new_led |= PCA9553_LED_SLOW(i); 300 301 /* if bytes counters changed, set fast blinking led */ 302 if (netdev->stats.rx_bytes != card->channel[i].prev_rx_bytes) { 303 card->channel[i].prev_rx_bytes = netdev->stats.rx_bytes; 304 new_led &= ~PCA9553_LED_MASK(i); 305 new_led |= PCA9553_LED_FAST(i); 306 } 307 if (netdev->stats.tx_bytes != card->channel[i].prev_tx_bytes) { 308 card->channel[i].prev_tx_bytes = netdev->stats.tx_bytes; 309 new_led &= ~PCA9553_LED_MASK(i); 310 new_led |= PCA9553_LED_FAST(i); 311 } 312 } 313 314 /* check if LS0 settings changed, only update i2c if so */ 315 peak_pciec_write_pca9553(card, 5, new_led); 316 317 /* restart timer (except if no more configured channels) */ 318 if (up_count) 319 schedule_delayed_work(&card->led_work, HZ); 320 } 321 322 /* 323 * set LEDs blinking state 324 */ 325 static void peak_pciec_set_leds(struct peak_pciec_card *card, u8 led_mask, u8 s) 326 { 327 u8 new_led = card->led_cache; 328 int i; 329 330 /* first check what is to do */ 331 for (i = 0; i < card->chan_count; i++) 332 if (led_mask & PCA9553_LED(i)) { 333 new_led &= ~PCA9553_LED_MASK(i); 334 new_led |= PCA9553_LED_STATE(s, i); 335 } 336 337 /* check if LS0 settings changed, only update i2c if so */ 338 peak_pciec_write_pca9553(card, 5, new_led); 339 } 340 341 /* 342 * start one second delayed work to control LEDs 343 */ 344 static void peak_pciec_start_led_work(struct peak_pciec_card *card) 345 { 346 schedule_delayed_work(&card->led_work, HZ); 347 } 348 349 /* 350 * stop LEDs delayed work 351 */ 352 static void peak_pciec_stop_led_work(struct peak_pciec_card *card) 353 { 354 cancel_delayed_work_sync(&card->led_work); 355 } 356 357 /* 358 * initialize the PCA9553 4-bit I2C-bus LED chip 359 */ 360 static int peak_pciec_init_leds(struct peak_pciec_card *card) 361 { 362 int err; 363 364 /* prescaler for frequency 0: "SLOW" = 1 Hz = "44" */ 365 err = peak_pciec_write_pca9553(card, 1, 44 / 1); 366 if (err) 367 return err; 368 369 /* duty cycle 0: 50% */ 370 err = peak_pciec_write_pca9553(card, 2, 0x80); 371 if (err) 372 return err; 373 374 /* prescaler for frequency 1: "FAST" = 5 Hz */ 375 err = peak_pciec_write_pca9553(card, 3, 44 / 5); 376 if (err) 377 return err; 378 379 /* duty cycle 1: 50% */ 380 err = peak_pciec_write_pca9553(card, 4, 0x80); 381 if (err) 382 return err; 383 384 /* switch LEDs to initial state */ 385 return peak_pciec_write_pca9553(card, 5, PCA9553_LS0_INIT); 386 } 387 388 /* 389 * restore LEDs state to off peak_pciec_leds_exit 390 */ 391 static void peak_pciec_leds_exit(struct peak_pciec_card *card) 392 { 393 /* switch LEDs to off */ 394 peak_pciec_write_pca9553(card, 5, PCA9553_LED_OFF_ALL); 395 } 396 397 /* 398 * normal write sja1000 register method overloaded to catch when controller 399 * is started or stopped, to control leds 400 */ 401 static void peak_pciec_write_reg(const struct sja1000_priv *priv, 402 int port, u8 val) 403 { 404 struct peak_pci_chan *chan = priv->priv; 405 struct peak_pciec_card *card = chan->pciec_card; 406 int c = (priv->reg_base - card->reg_base) / PEAK_PCI_CHAN_SIZE; 407 408 /* sja1000 register changes control the leds state */ 409 if (port == SJA1000_MOD) 410 switch (val) { 411 case MOD_RM: 412 /* Reset Mode: set led on */ 413 peak_pciec_set_leds(card, PCA9553_LED(c), PCA9553_ON); 414 break; 415 case 0x00: 416 /* Normal Mode: led slow blinking and start led timer */ 417 peak_pciec_set_leds(card, PCA9553_LED(c), PCA9553_SLOW); 418 peak_pciec_start_led_work(card); 419 break; 420 default: 421 break; 422 } 423 424 /* call base function */ 425 peak_pci_write_reg(priv, port, val); 426 } 427 428 static struct i2c_algo_bit_data peak_pciec_i2c_bit_ops = { 429 .setsda = pita_setsda, 430 .setscl = pita_setscl, 431 .getsda = pita_getsda, 432 .getscl = pita_getscl, 433 .udelay = 10, 434 .timeout = HZ, 435 }; 436 437 static int peak_pciec_probe(struct pci_dev *pdev, struct net_device *dev) 438 { 439 struct sja1000_priv *priv = netdev_priv(dev); 440 struct peak_pci_chan *chan = priv->priv; 441 struct peak_pciec_card *card; 442 int err; 443 444 /* copy i2c object address from 1st channel */ 445 if (chan->prev_dev) { 446 struct sja1000_priv *prev_priv = netdev_priv(chan->prev_dev); 447 struct peak_pci_chan *prev_chan = prev_priv->priv; 448 449 card = prev_chan->pciec_card; 450 if (!card) 451 return -ENODEV; 452 453 /* channel is the first one: do the init part */ 454 } else { 455 /* create the bit banging I2C adapter structure */ 456 card = kzalloc(sizeof(struct peak_pciec_card), GFP_KERNEL); 457 if (!card) 458 return -ENOMEM; 459 460 card->cfg_base = chan->cfg_base; 461 card->reg_base = priv->reg_base; 462 463 card->led_chip.owner = THIS_MODULE; 464 card->led_chip.dev.parent = &pdev->dev; 465 card->led_chip.algo_data = &card->i2c_bit; 466 strncpy(card->led_chip.name, "peak_i2c", 467 sizeof(card->led_chip.name)); 468 469 card->i2c_bit = peak_pciec_i2c_bit_ops; 470 card->i2c_bit.udelay = 10; 471 card->i2c_bit.timeout = HZ; 472 card->i2c_bit.data = card; 473 474 peak_pciec_init_pita_gpio(card); 475 476 err = i2c_bit_add_bus(&card->led_chip); 477 if (err) { 478 dev_err(&pdev->dev, "i2c init failed\n"); 479 goto pciec_init_err_1; 480 } 481 482 err = peak_pciec_init_leds(card); 483 if (err) { 484 dev_err(&pdev->dev, "leds hardware init failed\n"); 485 goto pciec_init_err_2; 486 } 487 488 INIT_DELAYED_WORK(&card->led_work, peak_pciec_led_work); 489 /* PCAN-ExpressCard needs its own callback for leds */ 490 priv->write_reg = peak_pciec_write_reg; 491 } 492 493 chan->pciec_card = card; 494 card->channel[card->chan_count++].netdev = dev; 495 496 return 0; 497 498 pciec_init_err_2: 499 i2c_del_adapter(&card->led_chip); 500 501 pciec_init_err_1: 502 peak_pciec_init_pita_gpio(card); 503 kfree(card); 504 505 return err; 506 } 507 508 static void peak_pciec_remove(struct peak_pciec_card *card) 509 { 510 peak_pciec_stop_led_work(card); 511 peak_pciec_leds_exit(card); 512 i2c_del_adapter(&card->led_chip); 513 peak_pciec_init_pita_gpio(card); 514 kfree(card); 515 } 516 517 #else /* CONFIG_CAN_PEAK_PCIEC */ 518 519 /* 520 * Placebo functions when PCAN-ExpressCard support is not selected 521 */ 522 static inline int peak_pciec_probe(struct pci_dev *pdev, struct net_device *dev) 523 { 524 return -ENODEV; 525 } 526 527 static inline void peak_pciec_remove(struct peak_pciec_card *card) 528 { 529 } 530 #endif /* CONFIG_CAN_PEAK_PCIEC */ 531 532 static u8 peak_pci_read_reg(const struct sja1000_priv *priv, int port) 533 { 534 return readb(priv->reg_base + (port << 2)); 535 } 536 537 static void peak_pci_write_reg(const struct sja1000_priv *priv, 538 int port, u8 val) 539 { 540 writeb(val, priv->reg_base + (port << 2)); 541 } 542 543 static void peak_pci_post_irq(const struct sja1000_priv *priv) 544 { 545 struct peak_pci_chan *chan = priv->priv; 546 u16 icr; 547 548 /* Select and clear in PITA stored interrupt */ 549 icr = readw(chan->cfg_base + PITA_ICR); 550 if (icr & chan->icr_mask) 551 writew(chan->icr_mask, chan->cfg_base + PITA_ICR); 552 } 553 554 static int peak_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 555 { 556 struct sja1000_priv *priv; 557 struct peak_pci_chan *chan; 558 struct net_device *dev, *prev_dev; 559 void __iomem *cfg_base, *reg_base; 560 u16 sub_sys_id, icr; 561 int i, err, channels; 562 563 err = pci_enable_device(pdev); 564 if (err) 565 return err; 566 567 err = pci_request_regions(pdev, DRV_NAME); 568 if (err) 569 goto failure_disable_pci; 570 571 err = pci_read_config_word(pdev, 0x2e, &sub_sys_id); 572 if (err) 573 goto failure_release_regions; 574 575 dev_dbg(&pdev->dev, "probing device %04x:%04x:%04x\n", 576 pdev->vendor, pdev->device, sub_sys_id); 577 578 err = pci_write_config_word(pdev, 0x44, 0); 579 if (err) 580 goto failure_release_regions; 581 582 if (sub_sys_id >= 12) 583 channels = 4; 584 else if (sub_sys_id >= 10) 585 channels = 3; 586 else if (sub_sys_id >= 4) 587 channels = 2; 588 else 589 channels = 1; 590 591 cfg_base = pci_iomap(pdev, 0, PEAK_PCI_CFG_SIZE); 592 if (!cfg_base) { 593 dev_err(&pdev->dev, "failed to map PCI resource #0\n"); 594 err = -ENOMEM; 595 goto failure_release_regions; 596 } 597 598 reg_base = pci_iomap(pdev, 1, PEAK_PCI_CHAN_SIZE * channels); 599 if (!reg_base) { 600 dev_err(&pdev->dev, "failed to map PCI resource #1\n"); 601 err = -ENOMEM; 602 goto failure_unmap_cfg_base; 603 } 604 605 /* Set GPIO control register */ 606 writew(0x0005, cfg_base + PITA_GPIOICR + 2); 607 /* Enable all channels of this card */ 608 writeb(0x00, cfg_base + PITA_GPIOICR); 609 /* Toggle reset */ 610 writeb(0x05, cfg_base + PITA_MISC + 3); 611 mdelay(5); 612 /* Leave parport mux mode */ 613 writeb(0x04, cfg_base + PITA_MISC + 3); 614 615 icr = readw(cfg_base + PITA_ICR + 2); 616 617 for (i = 0; i < channels; i++) { 618 dev = alloc_sja1000dev(sizeof(struct peak_pci_chan)); 619 if (!dev) { 620 err = -ENOMEM; 621 goto failure_remove_channels; 622 } 623 624 priv = netdev_priv(dev); 625 chan = priv->priv; 626 627 chan->cfg_base = cfg_base; 628 priv->reg_base = reg_base + i * PEAK_PCI_CHAN_SIZE; 629 630 priv->read_reg = peak_pci_read_reg; 631 priv->write_reg = peak_pci_write_reg; 632 priv->post_irq = peak_pci_post_irq; 633 634 priv->can.clock.freq = PEAK_PCI_CAN_CLOCK; 635 priv->ocr = PEAK_PCI_OCR; 636 priv->cdr = PEAK_PCI_CDR; 637 /* Neither a slave nor a single device distributes the clock */ 638 if (channels == 1 || i > 0) 639 priv->cdr |= CDR_CLK_OFF; 640 641 /* Setup interrupt handling */ 642 priv->irq_flags = IRQF_SHARED; 643 dev->irq = pdev->irq; 644 645 chan->icr_mask = peak_pci_icr_masks[i]; 646 icr |= chan->icr_mask; 647 648 SET_NETDEV_DEV(dev, &pdev->dev); 649 dev->dev_id = i; 650 651 /* Create chain of SJA1000 devices */ 652 chan->prev_dev = pci_get_drvdata(pdev); 653 pci_set_drvdata(pdev, dev); 654 655 /* 656 * PCAN-ExpressCard needs some additional i2c init. 657 * This must be done *before* register_sja1000dev() but 658 * *after* devices linkage 659 */ 660 if (pdev->device == PEAK_PCIEC_DEVICE_ID || 661 pdev->device == PEAK_PCIEC34_DEVICE_ID) { 662 err = peak_pciec_probe(pdev, dev); 663 if (err) { 664 dev_err(&pdev->dev, 665 "failed to probe device (err %d)\n", 666 err); 667 goto failure_free_dev; 668 } 669 } 670 671 err = register_sja1000dev(dev); 672 if (err) { 673 dev_err(&pdev->dev, "failed to register device\n"); 674 goto failure_free_dev; 675 } 676 677 dev_info(&pdev->dev, 678 "%s at reg_base=0x%p cfg_base=0x%p irq=%d\n", 679 dev->name, priv->reg_base, chan->cfg_base, dev->irq); 680 } 681 682 /* Enable interrupts */ 683 writew(icr, cfg_base + PITA_ICR + 2); 684 685 return 0; 686 687 failure_free_dev: 688 pci_set_drvdata(pdev, chan->prev_dev); 689 free_sja1000dev(dev); 690 691 failure_remove_channels: 692 /* Disable interrupts */ 693 writew(0x0, cfg_base + PITA_ICR + 2); 694 695 chan = NULL; 696 for (dev = pci_get_drvdata(pdev); dev; dev = prev_dev) { 697 priv = netdev_priv(dev); 698 chan = priv->priv; 699 prev_dev = chan->prev_dev; 700 701 unregister_sja1000dev(dev); 702 free_sja1000dev(dev); 703 } 704 705 /* free any PCIeC resources too */ 706 if (chan && chan->pciec_card) 707 peak_pciec_remove(chan->pciec_card); 708 709 pci_iounmap(pdev, reg_base); 710 711 failure_unmap_cfg_base: 712 pci_iounmap(pdev, cfg_base); 713 714 failure_release_regions: 715 pci_release_regions(pdev); 716 717 failure_disable_pci: 718 pci_disable_device(pdev); 719 720 /* pci_xxx_config_word() return positive PCIBIOS_xxx error codes while 721 * the probe() function must return a negative errno in case of failure 722 * (err is unchanged if negative) */ 723 return pcibios_err_to_errno(err); 724 } 725 726 static void peak_pci_remove(struct pci_dev *pdev) 727 { 728 struct net_device *dev = pci_get_drvdata(pdev); /* Last device */ 729 struct sja1000_priv *priv = netdev_priv(dev); 730 struct peak_pci_chan *chan = priv->priv; 731 void __iomem *cfg_base = chan->cfg_base; 732 void __iomem *reg_base = priv->reg_base; 733 734 /* Disable interrupts */ 735 writew(0x0, cfg_base + PITA_ICR + 2); 736 737 /* Loop over all registered devices */ 738 while (1) { 739 struct net_device *prev_dev = chan->prev_dev; 740 741 dev_info(&pdev->dev, "removing device %s\n", dev->name); 742 unregister_sja1000dev(dev); 743 free_sja1000dev(dev); 744 dev = prev_dev; 745 746 if (!dev) { 747 /* do that only for first channel */ 748 if (chan->pciec_card) 749 peak_pciec_remove(chan->pciec_card); 750 break; 751 } 752 priv = netdev_priv(dev); 753 chan = priv->priv; 754 } 755 756 pci_iounmap(pdev, reg_base); 757 pci_iounmap(pdev, cfg_base); 758 pci_release_regions(pdev); 759 pci_disable_device(pdev); 760 } 761 762 static struct pci_driver peak_pci_driver = { 763 .name = DRV_NAME, 764 .id_table = peak_pci_tbl, 765 .probe = peak_pci_probe, 766 .remove = peak_pci_remove, 767 }; 768 769 module_pci_driver(peak_pci_driver); 770