drivers/net/can/sja1000/peak_pci.c

   1 /*
   2  * Copyright (C) 2007, 2011 Wolfgang Grandegger <wg@grandegger.com>
   3  *
   4  * Derived from the PCAN project file driver/src/pcan_pci.c:
   5  *
   6  * Copyright (C) 2001-2006  PEAK System-Technik GmbH
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the version 2 of the GNU General Public License
  10  * as published by the Free Software Foundation
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software Foundation,
  19  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20  */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/delay.h>
  27 #include <linux/pci.h>
  28 #include <linux/io.h>
  29 #include <linux/can.h>
  30 #include <linux/can/dev.h>
  31
  32 #include "sja1000.h"
  33
  34 MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
  35 MODULE_DESCRIPTION("Socket-CAN driver for PEAK PCAN PCI/PCIe cards");
  36 MODULE_SUPPORTED_DEVICE("PEAK PCAN PCI/PCIe CAN card");
  37 MODULE_LICENSE("GPL v2");
  38
  39 #define DRV_NAME  "peak_pci"
  40
  41 struct peak_pci_chan {
  42         void __iomem *cfg_base;         /* Common for all channels */
  43         struct net_device *prev_dev;    /* Chain of network devices */
  44         u16 icr_mask;                   /* Interrupt mask for fast ack */
  45 };
  46
  47 #define PEAK_PCI_CAN_CLOCK      (16000000 / 2)
  48
  49 #define PEAK_PCI_CDR            (CDR_CBP | CDR_CLKOUT_MASK)
  50 #define PEAK_PCI_OCR            OCR_TX0_PUSHPULL
  51
  52 /*
  53  * Important PITA registers
  54  */
  55 #define PITA_ICR                0x00    /* Interrupt control register */
  56 #define PITA_GPIOICR            0x18    /* GPIO interface control register */
  57 #define PITA_MISC               0x1C    /* Miscellaneous register */
  58
  59 #define PEAK_PCI_CFG_SIZE       0x1000  /* Size of the config PCI bar */
  60 #define PEAK_PCI_CHAN_SIZE      0x0400  /* Size used by the channel */
  61
  62 #define PEAK_PCI_VENDOR_ID      0x001C  /* The PCI device and vendor IDs */
  63 #define PEAK_PCI_DEVICE_ID      0x0001  /* for PCI/PCIe slot cards */
  64
  65 static const u16 peak_pci_icr_masks[] = {0x02, 0x01, 0x40, 0x80};
  66
  67 static DEFINE_PCI_DEVICE_TABLE(peak_pci_tbl) = {
  68         {PEAK_PCI_VENDOR_ID, PEAK_PCI_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
  69         {0,}
  70 };
  71
  72 MODULE_DEVICE_TABLE(pci, peak_pci_tbl);
  73
  74 static u8 peak_pci_read_reg(const struct sja1000_priv *priv, int port)
  75 {
  76         return readb(priv->reg_base + (port << 2));
  77 }
  78
  79 static void peak_pci_write_reg(const struct sja1000_priv *priv,
  80                                int port, u8 val)
  81 {
  82         writeb(val, priv->reg_base + (port << 2));
  83 }
  84
  85 static void peak_pci_post_irq(const struct sja1000_priv *priv)
  86 {
  87         struct peak_pci_chan *chan = priv->priv;
  88         u16 icr;
  89
  90         /* Select and clear in PITA stored interrupt */
  91         icr = readw(chan->cfg_base + PITA_ICR);
  92         if (icr & chan->icr_mask)
  93                 writew(chan->icr_mask, chan->cfg_base + PITA_ICR);
  94 }
  95
  96 static int __devinit peak_pci_probe(struct pci_dev *pdev,
  97                                     const struct pci_device_id *ent)
  98 {
  99         struct sja1000_priv *priv;
 100         struct peak_pci_chan *chan;
 101         struct net_device *dev;
 102         void __iomem *cfg_base, *reg_base;
 103         u16 sub_sys_id, icr;
 104         int i, err, channels;
 105
 106         err = pci_enable_device(pdev);
 107         if (err)
 108                 return err;
 109
 110         err = pci_request_regions(pdev, DRV_NAME);
 111         if (err)
 112                 goto failure_disable_pci;
 113
 114         err = pci_read_config_word(pdev, 0x2e, &sub_sys_id);
 115         if (err)
 116                 goto failure_release_regions;
 117
 118         dev_dbg(&pdev->dev, "probing device %04x:%04x:%04x\n",
 119                 pdev->vendor, pdev->device, sub_sys_id);
 120
 121         err = pci_write_config_word(pdev, 0x44, 0);
 122         if (err)
 123                 goto failure_release_regions;
 124
 125         if (sub_sys_id >= 12)
 126                 channels = 4;
 127         else if (sub_sys_id >= 10)
 128                 channels = 3;
 129         else if (sub_sys_id >= 4)
 130                 channels = 2;
 131         else
 132                 channels = 1;
 133
 134         cfg_base = pci_iomap(pdev, 0, PEAK_PCI_CFG_SIZE);
 135         if (!cfg_base) {
 136                 dev_err(&pdev->dev, "failed to map PCI resource #0\n");
 137                 goto failure_release_regions;
 138         }
 139
 140         reg_base = pci_iomap(pdev, 1, PEAK_PCI_CHAN_SIZE * channels);
 141         if (!reg_base) {
 142                 dev_err(&pdev->dev, "failed to map PCI resource #1\n");
 143                 goto failure_unmap_cfg_base;
 144         }
 145
 146         /* Set GPIO control register */
 147         writew(0x0005, cfg_base + PITA_GPIOICR + 2);
 148         /* Enable all channels of this card */
 149         writeb(0x00, cfg_base + PITA_GPIOICR);
 150         /* Toggle reset */
 151         writeb(0x05, cfg_base + PITA_MISC + 3);
 152         mdelay(5);
 153         /* Leave parport mux mode */
 154         writeb(0x04, cfg_base + PITA_MISC + 3);
 155
 156         icr = readw(cfg_base + PITA_ICR + 2);
 157
 158         for (i = 0; i < channels; i++) {
 159                 dev = alloc_sja1000dev(sizeof(struct peak_pci_chan));
 160                 if (!dev) {
 161                         err = -ENOMEM;
 162                         goto failure_remove_channels;
 163                 }
 164
 165                 priv = netdev_priv(dev);
 166                 chan = priv->priv;
 167
 168                 chan->cfg_base = cfg_base;
 169                 priv->reg_base = reg_base + i * PEAK_PCI_CHAN_SIZE;
 170
 171                 priv->read_reg = peak_pci_read_reg;
 172                 priv->write_reg = peak_pci_write_reg;
 173                 priv->post_irq = peak_pci_post_irq;
 174
 175                 priv->can.clock.freq = PEAK_PCI_CAN_CLOCK;
 176                 priv->ocr = PEAK_PCI_OCR;
 177                 priv->cdr = PEAK_PCI_CDR;
 178                 /* Neither a slave nor a single device distributes the clock */
 179                 if (channels == 1 || i > 0)
 180                         priv->cdr |= CDR_CLK_OFF;
 181
 182                 /* Setup interrupt handling */
 183                 priv->irq_flags = IRQF_SHARED;
 184                 dev->irq = pdev->irq;
 185
 186                 chan->icr_mask = peak_pci_icr_masks[i];
 187                 icr |= chan->icr_mask;
 188
 189                 SET_NETDEV_DEV(dev, &pdev->dev);
 190
 191                 err = register_sja1000dev(dev);
 192                 if (err) {
 193                         dev_err(&pdev->dev, "failed to register device\n");
 194                         free_sja1000dev(dev);
 195                         goto failure_remove_channels;
 196                 }
 197
 198                 /* Create chain of SJA1000 devices */
 199                 chan->prev_dev = pci_get_drvdata(pdev);
 200                 pci_set_drvdata(pdev, dev);
 201
 202                 dev_info(&pdev->dev,
 203                          "%s at reg_base=0x%p cfg_base=0x%p irq=%d\n",
 204                          dev->name, priv->reg_base, chan->cfg_base, dev->irq);
 205         }
 206
 207         /* Enable interrupts */
 208         writew(icr, cfg_base + PITA_ICR + 2);
 209
 210         return 0;
 211
 212 failure_remove_channels:
 213         /* Disable interrupts */
 214         writew(0x0, cfg_base + PITA_ICR + 2);
 215
 216         for (dev = pci_get_drvdata(pdev); dev; dev = chan->prev_dev) {
 217                 unregister_sja1000dev(dev);
 218                 free_sja1000dev(dev);
 219                 priv = netdev_priv(dev);
 220                 chan = priv->priv;
 221         }
 222
 223         pci_iounmap(pdev, reg_base);
 224
 225 failure_unmap_cfg_base:
 226         pci_iounmap(pdev, cfg_base);
 227
 228 failure_release_regions:
 229         pci_release_regions(pdev);
 230
 231 failure_disable_pci:
 232         pci_disable_device(pdev);
 233
 234         return err;
 235 }
 236
 237 static void __devexit peak_pci_remove(struct pci_dev *pdev)
 238 {
 239         struct net_device *dev = pci_get_drvdata(pdev); /* Last device */
 240         struct sja1000_priv *priv = netdev_priv(dev);
 241         struct peak_pci_chan *chan = priv->priv;
 242         void __iomem *cfg_base = chan->cfg_base;
 243         void __iomem *reg_base = priv->reg_base;
 244
 245         /* Disable interrupts */
 246         writew(0x0, cfg_base + PITA_ICR + 2);
 247
 248         /* Loop over all registered devices */
 249         while (1) {
 250                 dev_info(&pdev->dev, "removing device %s\n", dev->name);
 251                 unregister_sja1000dev(dev);
 252                 free_sja1000dev(dev);
 253                 dev = chan->prev_dev;
 254                 if (!dev)
 255                         break;
 256                 priv = netdev_priv(dev);
 257                 chan = priv->priv;
 258         }
 259
 260         pci_iounmap(pdev, reg_base);
 261         pci_iounmap(pdev, cfg_base);
 262         pci_release_regions(pdev);
 263         pci_disable_device(pdev);
 264
 265         pci_set_drvdata(pdev, NULL);
 266 }
 267
 268 static struct pci_driver peak_pci_driver = {
 269         .name = DRV_NAME,
 270         .id_table = peak_pci_tbl,
 271         .probe = peak_pci_probe,
 272         .remove = __devexit_p(peak_pci_remove),
 273 };
 274
 275 static int __init peak_pci_init(void)
 276 {
 277         return pci_register_driver(&peak_pci_driver);
 278 }
 279 module_init(peak_pci_init);
 280
 281 static void __exit peak_pci_exit(void)
 282 {
 283         pci_unregister_driver(&peak_pci_driver);
 284 }
 285 module_exit(peak_pci_exit);