LXR linux/drivers/net/can/sja1000/peak

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) 2007, 2011 Wolfgang Grandegger <wg@grandegger.com>
   4 * Copyright (C) 2012 Stephane Grosjean <s.grosjean@peak-system.com>
   5 *
   6 * Derived from the PCAN project file driver/src/pcan_pci.c:
   7 *
   8 * Copyright (C) 2001-2006  PEAK System-Technik GmbH
   9 */
  10
  11#include <linux/kernel.h>
  12#include <linux/module.h>
  13#include <linux/interrupt.h>
  14#include <linux/netdevice.h>
  15#include <linux/delay.h>
  16#include <linux/pci.h>
  17#include <linux/io.h>
  18#include <linux/i2c.h>
  19#include <linux/i2c-algo-bit.h>
  20#include <linux/can.h>
  21#include <linux/can/dev.h>
  22
  23#include "sja1000.h"
  24
  25MODULE_AUTHOR("Stephane Grosjean <s.grosjean@peak-system.com>");
  26MODULE_DESCRIPTION("Socket-CAN driver for PEAK PCAN PCI family cards");
  27MODULE_LICENSE("GPL v2");
  28
  29#define DRV_NAME  "peak_pci"
  30
  31/* FPGA cards FW version registers */
  32#define PEAK_VER_REG1           0x40
  33#define PEAK_VER_REG2           0x44
  34
  35struct peak_pciec_card;
  36struct peak_pci_chan {
  37        void __iomem *cfg_base;         /* Common for all channels */
  38        struct net_device *prev_dev;    /* Chain of network devices */
  39        u16 icr_mask;                   /* Interrupt mask for fast ack */
  40        struct peak_pciec_card *pciec_card;     /* only for PCIeC LEDs */
  41};
  42
  43#define PEAK_PCI_CAN_CLOCK      (16000000 / 2)
  44
  45#define PEAK_PCI_CDR            (CDR_CBP | CDR_CLKOUT_MASK)
  46#define PEAK_PCI_OCR            OCR_TX0_PUSHPULL
  47
  48/* Important PITA registers */
  49#define PITA_ICR                0x00    /* Interrupt control register */
  50#define PITA_GPIOICR            0x18    /* GPIO interface control register */
  51#define PITA_MISC               0x1C    /* Miscellaneous register */
  52
  53#define PEAK_PCI_CFG_SIZE       0x1000  /* Size of the config PCI bar */
  54#define PEAK_PCI_CHAN_SIZE      0x0400  /* Size used by the channel */
  55
  56#define PEAK_PCI_VENDOR_ID      0x001C  /* The PCI device and vendor IDs */
  57#define PEAK_PCI_DEVICE_ID      0x0001  /* for PCI/PCIe slot cards */
  58#define PEAK_PCIEC_DEVICE_ID    0x0002  /* for ExpressCard slot cards */
  59#define PEAK_PCIE_DEVICE_ID     0x0003  /* for nextgen PCIe slot cards */
  60#define PEAK_CPCI_DEVICE_ID     0x0004  /* for nextgen cPCI slot cards */
  61#define PEAK_MPCI_DEVICE_ID     0x0005  /* for nextgen miniPCI slot cards */
  62#define PEAK_PC_104P_DEVICE_ID  0x0006  /* PCAN-PC/104+ cards */
  63#define PEAK_PCI_104E_DEVICE_ID 0x0007  /* PCAN-PCI/104 Express cards */
  64#define PEAK_MPCIE_DEVICE_ID    0x0008  /* The miniPCIe slot cards */
  65#define PEAK_PCIE_OEM_ID        0x0009  /* PCAN-PCI Express OEM */
  66#define PEAK_PCIEC34_DEVICE_ID  0x000A  /* PCAN-PCI Express 34 (one channel) */
  67
  68#define PEAK_PCI_CHAN_MAX       4
  69
  70static const u16 peak_pci_icr_masks[PEAK_PCI_CHAN_MAX] = {
  71        0x02, 0x01, 0x40, 0x80
  72};
  73
  74static const struct pci_device_id peak_pci_tbl[] = {
  75        {
  76                PEAK_PCI_VENDOR_ID, PEAK_PCI_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,
  77                .driver_data = (kernel_ulong_t)"PCAN-PCI",
  78        }, {
  79                PEAK_PCI_VENDOR_ID, PEAK_PCIE_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,
  80                .driver_data = (kernel_ulong_t)"PCAN-PCI Express",
  81        }, {
  82                PEAK_PCI_VENDOR_ID, PEAK_MPCI_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,
  83                .driver_data = (kernel_ulong_t)"PCAN-miniPCI",
  84        }, {
  85                PEAK_PCI_VENDOR_ID, PEAK_MPCIE_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,
  86                .driver_data = (kernel_ulong_t)"PCAN-miniPCIe",
  87        }, {
  88                PEAK_PCI_VENDOR_ID, PEAK_PC_104P_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,
  89                .driver_data = (kernel_ulong_t)"PCAN-PC/104-Plus Quad",
  90        }, {
  91                PEAK_PCI_VENDOR_ID, PEAK_PCI_104E_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,
  92                .driver_data = (kernel_ulong_t)"PCAN-PCI/104-Express",
  93        }, {
  94                PEAK_PCI_VENDOR_ID, PEAK_CPCI_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,
  95                .driver_data = (kernel_ulong_t)"PCAN-cPCI",
  96        }, {
  97                PEAK_PCI_VENDOR_ID, PEAK_PCIE_OEM_ID, PCI_ANY_ID, PCI_ANY_ID,
  98                .driver_data = (kernel_ulong_t)"PCAN-Chip PCIe",
  99        },
 100#ifdef CONFIG_CAN_PEAK_PCIEC
 101        {
 102                PEAK_PCI_VENDOR_ID, PEAK_PCIEC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,
 103                .driver_data = (kernel_ulong_t)"PCAN-ExpressCard",
 104        }, {
 105                PEAK_PCI_VENDOR_ID, PEAK_PCIEC34_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,
 106                .driver_data = (kernel_ulong_t)"PCAN-ExpressCard 34",
 107        },
 108#endif
 109        { /* sentinel */ }
 110};
 111
 112MODULE_DEVICE_TABLE(pci, peak_pci_tbl);
 113
 114#ifdef CONFIG_CAN_PEAK_PCIEC
 115/* PCAN-ExpressCard needs I2C bit-banging configuration option. */
 116
 117/* GPIOICR byte access offsets */
 118#define PITA_GPOUT              0x18    /* GPx output value */
 119#define PITA_GPIN               0x19    /* GPx input value */
 120#define PITA_GPOEN              0x1A    /* configure GPx as output pin */
 121
 122/* I2C GP bits */
 123#define PITA_GPIN_SCL           0x01    /* Serial Clock Line */
 124#define PITA_GPIN_SDA           0x04    /* Serial DAta line */
 125
 126#define PCA9553_1_SLAVEADDR     (0xC4 >> 1)
 127
 128/* PCA9553 LS0 fields values */
 129enum {
 130        PCA9553_LOW,
 131        PCA9553_HIGHZ,
 132        PCA9553_PWM0,
 133        PCA9553_PWM1
 134};
 135
 136/* LEDs control */
 137#define PCA9553_ON              PCA9553_LOW
 138#define PCA9553_OFF             PCA9553_HIGHZ
 139#define PCA9553_SLOW            PCA9553_PWM0
 140#define PCA9553_FAST            PCA9553_PWM1
 141
 142#define PCA9553_LED(c)          (1 << (c))
 143#define PCA9553_LED_STATE(s, c) ((s) << ((c) << 1))
 144
 145#define PCA9553_LED_ON(c)       PCA9553_LED_STATE(PCA9553_ON, c)
 146#define PCA9553_LED_OFF(c)      PCA9553_LED_STATE(PCA9553_OFF, c)
 147#define PCA9553_LED_SLOW(c)     PCA9553_LED_STATE(PCA9553_SLOW, c)
 148#define PCA9553_LED_FAST(c)     PCA9553_LED_STATE(PCA9553_FAST, c)
 149#define PCA9553_LED_MASK(c)     PCA9553_LED_STATE(0x03, c)
 150
 151#define PCA9553_LED_OFF_ALL     (PCA9553_LED_OFF(0) | PCA9553_LED_OFF(1))
 152
 153#define PCA9553_LS0_INIT        0x40 /* initial value (!= from 0x00) */
 154
 155struct peak_pciec_chan {
 156        struct net_device *netdev;
 157        unsigned long prev_rx_bytes;
 158        unsigned long prev_tx_bytes;
 159};
 160
 161struct peak_pciec_card {
 162        void __iomem *cfg_base;         /* Common for all channels */
 163        void __iomem *reg_base;         /* first channel base address */
 164        u8 led_cache;                   /* leds state cache */
 165
 166        /* PCIExpressCard i2c data */
 167        struct i2c_algo_bit_data i2c_bit;
 168        struct i2c_adapter led_chip;
 169        struct delayed_work led_work;   /* led delayed work */
 170        int chan_count;
 171        struct peak_pciec_chan channel[PEAK_PCI_CHAN_MAX];
 172};
 173
 174/* "normal" pci register write callback is overloaded for leds control */
 175static void peak_pci_write_reg(const struct sja1000_priv *priv,
 176                               int port, u8 val);
 177
 178static inline void pita_set_scl_highz(struct peak_pciec_card *card)
 179{
 180        u8 gp_outen = readb(card->cfg_base + PITA_GPOEN) & ~PITA_GPIN_SCL;
 181
 182        writeb(gp_outen, card->cfg_base + PITA_GPOEN);
 183}
 184
 185static inline void pita_set_sda_highz(struct peak_pciec_card *card)
 186{
 187        u8 gp_outen = readb(card->cfg_base + PITA_GPOEN) & ~PITA_GPIN_SDA;
 188
 189        writeb(gp_outen, card->cfg_base + PITA_GPOEN);
 190}
 191
 192static void peak_pciec_init_pita_gpio(struct peak_pciec_card *card)
 193{
 194        /* raise SCL & SDA GPIOs to high-Z */
 195        pita_set_scl_highz(card);
 196        pita_set_sda_highz(card);
 197}
 198
 199static void pita_setsda(void *data, int state)
 200{
 201        struct peak_pciec_card *card = (struct peak_pciec_card *)data;
 202        u8 gp_out, gp_outen;
 203
 204        /* set output sda always to 0 */
 205        gp_out = readb(card->cfg_base + PITA_GPOUT) & ~PITA_GPIN_SDA;
 206        writeb(gp_out, card->cfg_base + PITA_GPOUT);
 207
 208        /* control output sda with GPOEN */
 209        gp_outen = readb(card->cfg_base + PITA_GPOEN);
 210        if (state)
 211                gp_outen &= ~PITA_GPIN_SDA;
 212        else
 213                gp_outen |= PITA_GPIN_SDA;
 214
 215        writeb(gp_outen, card->cfg_base + PITA_GPOEN);
 216}
 217
 218static void pita_setscl(void *data, int state)
 219{
 220        struct peak_pciec_card *card = (struct peak_pciec_card *)data;
 221        u8 gp_out, gp_outen;
 222
 223        /* set output scl always to 0 */
 224        gp_out = readb(card->cfg_base + PITA_GPOUT) & ~PITA_GPIN_SCL;
 225        writeb(gp_out, card->cfg_base + PITA_GPOUT);
 226
 227        /* control output scl with GPOEN */
 228        gp_outen = readb(card->cfg_base + PITA_GPOEN);
 229        if (state)
 230                gp_outen &= ~PITA_GPIN_SCL;
 231        else
 232                gp_outen |= PITA_GPIN_SCL;
 233
 234        writeb(gp_outen, card->cfg_base + PITA_GPOEN);
 235}
 236
 237static int pita_getsda(void *data)
 238{
 239        struct peak_pciec_card *card = (struct peak_pciec_card *)data;
 240
 241        /* set tristate */
 242        pita_set_sda_highz(card);
 243
 244        return (readb(card->cfg_base + PITA_GPIN) & PITA_GPIN_SDA) ? 1 : 0;
 245}
 246
 247static int pita_getscl(void *data)
 248{
 249        struct peak_pciec_card *card = (struct peak_pciec_card *)data;
 250
 251        /* set tristate */
 252        pita_set_scl_highz(card);
 253
 254        return (readb(card->cfg_base + PITA_GPIN) & PITA_GPIN_SCL) ? 1 : 0;
 255}
 256
 257/* write commands to the LED chip though the I2C-bus of the PCAN-PCIeC */
 258static int peak_pciec_write_pca9553(struct peak_pciec_card *card,
 259                                    u8 offset, u8 data)
 260{
 261        u8 buffer[2] = {
 262                offset,
 263                data
 264        };
 265        struct i2c_msg msg = {
 266                .addr = PCA9553_1_SLAVEADDR,
 267                .len = 2,
 268                .buf = buffer,
 269        };
 270        int ret;
 271
 272        /* cache led mask */
 273        if (offset == 5 && data == card->led_cache)
 274                return 0;
 275
 276        ret = i2c_transfer(&card->led_chip, &msg, 1);
 277        if (ret < 0)
 278                return ret;
 279
 280        if (offset == 5)
 281                card->led_cache = data;
 282
 283        return 0;
 284}
 285
 286/* delayed work callback used to control the LEDs */
 287static void peak_pciec_led_work(struct work_struct *work)
 288{
 289        struct peak_pciec_card *card =
 290                container_of(work, struct peak_pciec_card, led_work.work);
 291        struct net_device *netdev;
 292        u8 new_led = card->led_cache;
 293        int i, up_count = 0;
 294
 295        /* first check what is to do */
 296        for (i = 0; i < card->chan_count; i++) {
 297                /* default is: not configured */
 298                new_led &= ~PCA9553_LED_MASK(i);
 299                new_led |= PCA9553_LED_ON(i);
 300
 301                netdev = card->channel[i].netdev;
 302                if (!netdev || !(netdev->flags & IFF_UP))
 303                        continue;
 304
 305                up_count++;
 306
 307                /* no activity (but configured) */
 308                new_led &= ~PCA9553_LED_MASK(i);
 309                new_led |= PCA9553_LED_SLOW(i);
 310
 311                /* if bytes counters changed, set fast blinking led */
 312                if (netdev->stats.rx_bytes != card->channel[i].prev_rx_bytes) {
 313                        card->channel[i].prev_rx_bytes = netdev->stats.rx_bytes;
 314                        new_led &= ~PCA9553_LED_MASK(i);
 315                        new_led |= PCA9553_LED_FAST(i);
 316                }
 317                if (netdev->stats.tx_bytes != card->channel[i].prev_tx_bytes) {
 318                        card->channel[i].prev_tx_bytes = netdev->stats.tx_bytes;
 319                        new_led &= ~PCA9553_LED_MASK(i);
 320                        new_led |= PCA9553_LED_FAST(i);
 321                }
 322        }
 323
 324        /* check if LS0 settings changed, only update i2c if so */
 325        peak_pciec_write_pca9553(card, 5, new_led);
 326
 327        /* restart timer (except if no more configured channels) */
 328        if (up_count)
 329                schedule_delayed_work(&card->led_work, HZ);
 330}
 331
 332/* set LEDs blinking state */
 333static void peak_pciec_set_leds(struct peak_pciec_card *card, u8 led_mask, u8 s)
 334{
 335        u8 new_led = card->led_cache;
 336        int i;
 337
 338        /* first check what is to do */
 339        for (i = 0; i < card->chan_count; i++)
 340                if (led_mask & PCA9553_LED(i)) {
 341                        new_led &= ~PCA9553_LED_MASK(i);
 342                        new_led |= PCA9553_LED_STATE(s, i);
 343                }
 344
 345        /* check if LS0 settings changed, only update i2c if so */
 346        peak_pciec_write_pca9553(card, 5, new_led);
 347}
 348
 349/* start one second delayed work to control LEDs */
 350static void peak_pciec_start_led_work(struct peak_pciec_card *card)
 351{
 352        schedule_delayed_work(&card->led_work, HZ);
 353}
 354
 355/* stop LEDs delayed work */
 356static void peak_pciec_stop_led_work(struct peak_pciec_card *card)
 357{
 358        cancel_delayed_work_sync(&card->led_work);
 359}
 360
 361/* initialize the PCA9553 4-bit I2C-bus LED chip */
 362static int peak_pciec_init_leds(struct peak_pciec_card *card)
 363{
 364        int err;
 365
 366        /* prescaler for frequency 0: "SLOW" = 1 Hz = "44" */
 367        err = peak_pciec_write_pca9553(card, 1, 44 / 1);
 368        if (err)
 369                return err;
 370
 371        /* duty cycle 0: 50% */
 372        err = peak_pciec_write_pca9553(card, 2, 0x80);
 373        if (err)
 374                return err;
 375
 376        /* prescaler for frequency 1: "FAST" = 5 Hz */
 377        err = peak_pciec_write_pca9553(card, 3, 44 / 5);
 378        if (err)
 379                return err;
 380
 381        /* duty cycle 1: 50% */
 382        err = peak_pciec_write_pca9553(card, 4, 0x80);
 383        if (err)
 384                return err;
 385
 386        /* switch LEDs to initial state */
 387        return peak_pciec_write_pca9553(card, 5, PCA9553_LS0_INIT);
 388}
 389
 390/* restore LEDs state to off peak_pciec_leds_exit */
 391static 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/* normal write sja1000 register method overloaded to catch when controller
 398 * is started or stopped, to control leds
 399 */
 400static void peak_pciec_write_reg(const struct sja1000_priv *priv,
 401                                 int port, u8 val)
 402{
 403        struct peak_pci_chan *chan = priv->priv;
 404        struct peak_pciec_card *card = chan->pciec_card;
 405        int c = (priv->reg_base - card->reg_base) / PEAK_PCI_CHAN_SIZE;
 406
 407        /* sja1000 register changes control the leds state */
 408        if (port == SJA1000_MOD)
 409                switch (val) {
 410                case MOD_RM:
 411                        /* Reset Mode: set led on */
 412                        peak_pciec_set_leds(card, PCA9553_LED(c), PCA9553_ON);
 413                        break;
 414                case 0x00:
 415                        /* Normal Mode: led slow blinking and start led timer */
 416                        peak_pciec_set_leds(card, PCA9553_LED(c), PCA9553_SLOW);
 417                        peak_pciec_start_led_work(card);
 418                        break;
 419                default:
 420                        break;
 421                }
 422
 423        /* call base function */
 424        peak_pci_write_reg(priv, port, val);
 425}
 426
 427static const struct i2c_algo_bit_data peak_pciec_i2c_bit_ops = {
 428        .setsda = pita_setsda,
 429        .setscl = pita_setscl,
 430        .getsda = pita_getsda,
 431        .getscl = pita_getscl,
 432        .udelay = 10,
 433        .timeout = HZ,
 434};
 435
 436static int peak_pciec_probe(struct pci_dev *pdev, struct net_device *dev)
 437{
 438        struct sja1000_priv *priv = netdev_priv(dev);
 439        struct peak_pci_chan *chan = priv->priv;
 440        struct peak_pciec_card *card;
 441        int err;
 442
 443        /* copy i2c object address from 1st channel */
 444        if (chan->prev_dev) {
 445                struct sja1000_priv *prev_priv = netdev_priv(chan->prev_dev);
 446                struct peak_pci_chan *prev_chan = prev_priv->priv;
 447
 448                card = prev_chan->pciec_card;
 449                if (!card)
 450                        return -ENODEV;
 451
 452        /* channel is the first one: do the init part */
 453        } else {
 454                /* create the bit banging I2C adapter structure */
 455                card = kzalloc(sizeof(*card), GFP_KERNEL);
 456                if (!card)
 457                        return -ENOMEM;
 458
 459                card->cfg_base = chan->cfg_base;
 460                card->reg_base = priv->reg_base;
 461
 462                card->led_chip.owner = THIS_MODULE;
 463                card->led_chip.dev.parent = &pdev->dev;
 464                card->led_chip.algo_data = &card->i2c_bit;
 465                strncpy(card->led_chip.name, "peak_i2c",
 466                        sizeof(card->led_chip.name));
 467
 468                card->i2c_bit = peak_pciec_i2c_bit_ops;
 469                card->i2c_bit.udelay = 10;
 470                card->i2c_bit.timeout = HZ;
 471                card->i2c_bit.data = card;
 472
 473                peak_pciec_init_pita_gpio(card);
 474
 475                err = i2c_bit_add_bus(&card->led_chip);
 476                if (err) {
 477                        dev_err(&pdev->dev, "i2c init failed\n");
 478                        goto pciec_init_err_1;
 479                }
 480
 481                err = peak_pciec_init_leds(card);
 482                if (err) {
 483                        dev_err(&pdev->dev, "leds hardware init failed\n");
 484                        goto pciec_init_err_2;
 485                }
 486
 487                INIT_DELAYED_WORK(&card->led_work, peak_pciec_led_work);
 488                /* PCAN-ExpressCard needs its own callback for leds */
 489                priv->write_reg = peak_pciec_write_reg;
 490        }
 491
 492        chan->pciec_card = card;
 493        card->channel[card->chan_count++].netdev = dev;
 494
 495        return 0;
 496
 497pciec_init_err_2:
 498        i2c_del_adapter(&card->led_chip);
 499
 500pciec_init_err_1:
 501        peak_pciec_init_pita_gpio(card);
 502        kfree(card);
 503
 504        return err;
 505}
 506
 507static void peak_pciec_remove(struct peak_pciec_card *card)
 508{
 509        peak_pciec_stop_led_work(card);
 510        peak_pciec_leds_exit(card);
 511        i2c_del_adapter(&card->led_chip);
 512        peak_pciec_init_pita_gpio(card);
 513        kfree(card);
 514}
 515
 516#else /* CONFIG_CAN_PEAK_PCIEC */
 517
 518/* Placebo functions when PCAN-ExpressCard support is not selected */
 519static inline int peak_pciec_probe(struct pci_dev *pdev, struct net_device *dev)
 520{
 521        return -ENODEV;
 522}
 523
 524static inline void peak_pciec_remove(struct peak_pciec_card *card)
 525{
 526}
 527#endif /* CONFIG_CAN_PEAK_PCIEC */
 528
 529static u8 peak_pci_read_reg(const struct sja1000_priv *priv, int port)
 530{
 531        return readb(priv->reg_base + (port << 2));
 532}
 533
 534static void peak_pci_write_reg(const struct sja1000_priv *priv,
 535                               int port, u8 val)
 536{
 537        writeb(val, priv->reg_base + (port << 2));
 538}
 539
 540static void peak_pci_post_irq(const struct sja1000_priv *priv)
 541{
 542        struct peak_pci_chan *chan = priv->priv;
 543        u16 icr;
 544
 545        /* Select and clear in PITA stored interrupt */
 546        icr = readw(chan->cfg_base + PITA_ICR);
 547        if (icr & chan->icr_mask)
 548                writew(chan->icr_mask, chan->cfg_base + PITA_ICR);
 549}
 550
 551static int peak_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 552{
 553        struct sja1000_priv *priv;
 554        struct peak_pci_chan *chan;
 555        struct net_device *dev, *prev_dev;
 556        void __iomem *cfg_base, *reg_base;
 557        u16 sub_sys_id, icr;
 558        int i, err, channels;
 559        char fw_str[14] = "";
 560
 561        err = pci_enable_device(pdev);
 562        if (err)
 563                return err;
 564
 565        err = pci_request_regions(pdev, DRV_NAME);
 566        if (err)
 567                goto failure_disable_pci;
 568
 569        err = pci_read_config_word(pdev, 0x2e, &sub_sys_id);
 570        if (err)
 571                goto failure_release_regions;
 572
 573        dev_dbg(&pdev->dev, "probing device %04x:%04x:%04x\n",
 574                pdev->vendor, pdev->device, sub_sys_id);
 575
 576        err = pci_write_config_word(pdev, 0x44, 0);
 577        if (err)
 578                goto failure_release_regions;
 579
 580        if (sub_sys_id >= 12)
 581                channels = 4;
 582        else if (sub_sys_id >= 10)
 583                channels = 3;
 584        else if (sub_sys_id >= 4)
 585                channels = 2;
 586        else
 587                channels = 1;
 588
 589        cfg_base = pci_iomap(pdev, 0, PEAK_PCI_CFG_SIZE);
 590        if (!cfg_base) {
 591                dev_err(&pdev->dev, "failed to map PCI resource #0\n");
 592                err = -ENOMEM;
 593                goto failure_release_regions;
 594        }
 595
 596        reg_base = pci_iomap(pdev, 1, PEAK_PCI_CHAN_SIZE * channels);
 597        if (!reg_base) {
 598                dev_err(&pdev->dev, "failed to map PCI resource #1\n");
 599                err = -ENOMEM;
 600                goto failure_unmap_cfg_base;
 601        }
 602
 603        /* Set GPIO control register */
 604        writew(0x0005, cfg_base + PITA_GPIOICR + 2);
 605        /* Enable all channels of this card */
 606        writeb(0x00, cfg_base + PITA_GPIOICR);
 607        /* Toggle reset */
 608        writeb(0x05, cfg_base + PITA_MISC + 3);
 609        usleep_range(5000, 6000);
 610        /* Leave parport mux mode */
 611        writeb(0x04, cfg_base + PITA_MISC + 3);
 612
 613        /* FPGA equipped card if not 0 */
 614        if (readl(cfg_base + PEAK_VER_REG1)) {
 615                /* FPGA card: display version of the running firmware */
 616                u32 fw_ver = readl(cfg_base + PEAK_VER_REG2);
 617
 618                snprintf(fw_str, sizeof(fw_str), " FW v%u.%u.%u",
 619                         (fw_ver >> 12) & 0xf,
 620                         (fw_ver >> 8) & 0xf,
 621                         (fw_ver >> 4) & 0xf);
 622        }
 623
 624        /* Display commercial name (and, eventually, FW version) of the card */
 625        dev_info(&pdev->dev, "%ux CAN %s%s\n",
 626                 channels, (const char *)ent->driver_data, fw_str);
 627
 628        icr = readw(cfg_base + PITA_ICR + 2);
 629
 630        for (i = 0; i < channels; i++) {
 631                dev = alloc_sja1000dev(sizeof(struct peak_pci_chan));
 632                if (!dev) {
 633                        err = -ENOMEM;
 634                        goto failure_remove_channels;
 635                }
 636
 637                priv = netdev_priv(dev);
 638                chan = priv->priv;
 639
 640                chan->cfg_base = cfg_base;
 641                priv->reg_base = reg_base + i * PEAK_PCI_CHAN_SIZE;
 642
 643                priv->read_reg = peak_pci_read_reg;
 644                priv->write_reg = peak_pci_write_reg;
 645                priv->post_irq = peak_pci_post_irq;
 646
 647                priv->can.clock.freq = PEAK_PCI_CAN_CLOCK;
 648                priv->ocr = PEAK_PCI_OCR;
 649                priv->cdr = PEAK_PCI_CDR;
 650                /* Neither a slave nor a single device distributes the clock */
 651                if (channels == 1 || i > 0)
 652                        priv->cdr |= CDR_CLK_OFF;
 653
 654                /* Setup interrupt handling */
 655                priv->irq_flags = IRQF_SHARED;
 656                dev->irq = pdev->irq;
 657
 658                chan->icr_mask = peak_pci_icr_masks[i];
 659                icr |= chan->icr_mask;
 660
 661                SET_NETDEV_DEV(dev, &pdev->dev);
 662                dev->dev_id = i;
 663
 664                /* Create chain of SJA1000 devices */
 665                chan->prev_dev = pci_get_drvdata(pdev);
 666                pci_set_drvdata(pdev, dev);
 667
 668                /* PCAN-ExpressCard needs some additional i2c init.
 669                 * This must be done *before* register_sja1000dev() but
 670                 * *after* devices linkage
 671                 */
 672                if (pdev->device == PEAK_PCIEC_DEVICE_ID ||
 673                    pdev->device == PEAK_PCIEC34_DEVICE_ID) {
 674                        err = peak_pciec_probe(pdev, dev);
 675                        if (err) {
 676                                dev_err(&pdev->dev,
 677                                        "failed to probe device (err %d)\n",
 678                                        err);
 679                                goto failure_free_dev;
 680                        }
 681                }
 682
 683                err = register_sja1000dev(dev);
 684                if (err) {
 685                        dev_err(&pdev->dev, "failed to register device\n");
 686                        goto failure_free_dev;
 687                }
 688
 689                dev_info(&pdev->dev,
 690                         "%s at reg_base=0x%p cfg_base=0x%p irq=%d\n",
 691                         dev->name, priv->reg_base, chan->cfg_base, dev->irq);
 692        }
 693
 694        /* Enable interrupts */
 695        writew(icr, cfg_base + PITA_ICR + 2);
 696
 697        return 0;
 698
 699failure_free_dev:
 700        pci_set_drvdata(pdev, chan->prev_dev);
 701        free_sja1000dev(dev);
 702
 703failure_remove_channels:
 704        /* Disable interrupts */
 705        writew(0x0, cfg_base + PITA_ICR + 2);
 706
 707        chan = NULL;
 708        for (dev = pci_get_drvdata(pdev); dev; dev = prev_dev) {
 709                priv = netdev_priv(dev);
 710                chan = priv->priv;
 711                prev_dev = chan->prev_dev;
 712
 713                unregister_sja1000dev(dev);
 714                free_sja1000dev(dev);
 715        }
 716
 717        /* free any PCIeC resources too */
 718        if (chan && chan->pciec_card)
 719                peak_pciec_remove(chan->pciec_card);
 720
 721        pci_iounmap(pdev, reg_base);
 722
 723failure_unmap_cfg_base:
 724        pci_iounmap(pdev, cfg_base);
 725
 726failure_release_regions:
 727        pci_release_regions(pdev);
 728
 729failure_disable_pci:
 730        pci_disable_device(pdev);
 731
 732        /* pci_xxx_config_word() return positive PCIBIOS_xxx error codes while
 733         * the probe() function must return a negative errno in case of failure
 734         * (err is unchanged if negative)
 735         */
 736        return pcibios_err_to_errno(err);
 737}
 738
 739static void peak_pci_remove(struct pci_dev *pdev)
 740{
 741        struct net_device *dev = pci_get_drvdata(pdev); /* Last device */
 742        struct sja1000_priv *priv = netdev_priv(dev);
 743        struct peak_pci_chan *chan = priv->priv;
 744        void __iomem *cfg_base = chan->cfg_base;
 745        void __iomem *reg_base = priv->reg_base;
 746
 747        /* Disable interrupts */
 748        writew(0x0, cfg_base + PITA_ICR + 2);
 749
 750        /* Loop over all registered devices */
 751        while (1) {
 752                struct net_device *prev_dev = chan->prev_dev;
 753
 754                dev_info(&pdev->dev, "removing device %s\n", dev->name);
 755                /* do that only for first channel */
 756                if (!prev_dev && chan->pciec_card)
 757                        peak_pciec_remove(chan->pciec_card);
 758                unregister_sja1000dev(dev);
 759                free_sja1000dev(dev);
 760                dev = prev_dev;
 761
 762                if (!dev)
 763                        break;
 764                priv = netdev_priv(dev);
 765                chan = priv->priv;
 766        }
 767
 768        pci_iounmap(pdev, reg_base);
 769        pci_iounmap(pdev, cfg_base);
 770        pci_release_regions(pdev);
 771        pci_disable_device(pdev);
 772}
 773
 774static struct pci_driver peak_pci_driver = {
 775        .name = DRV_NAME,
 776        .id_table = peak_pci_tbl,
 777        .probe = peak_pci_probe,
 778        .remove = peak_pci_remove,
 779};
 780
 781module_pci_driver(peak_pci_driver);
 782