drivers/uwb/whci.c

   1 /*
   2  * WHCI UWB Multi-interface Controller enumerator.
   3  *
   4  * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
   5  *
   6  * This file is released under the GNU GPL v2.
   7  */
   8 #include <linux/delay.h>
   9 #include <linux/kernel.h>
  10 #include <linux/pci.h>
  11 #include <linux/dma-mapping.h>
  12 #include <linux/slab.h>
  13 #include <linux/uwb/whci.h>
  14 #include <linux/uwb/umc.h>
  15
  16 struct whci_card {
  17         struct pci_dev *pci;
  18         void __iomem *uwbbase;
  19         u8 n_caps;
  20         struct umc_dev *devs[0];
  21 };
  22
  23
  24 /* Fix faulty HW :( */
  25 static
  26 u64 whci_capdata_quirks(struct whci_card *card, u64 capdata)
  27 {
  28         u64 capdata_orig = capdata;
  29         struct pci_dev *pci_dev = card->pci;
  30         if (pci_dev->vendor == PCI_VENDOR_ID_INTEL
  31             && (pci_dev->device == 0x0c3b || pci_dev->device == 0004)
  32             && pci_dev->class == 0x0d1010) {
  33                 switch (UWBCAPDATA_TO_CAP_ID(capdata)) {
  34                         /* WLP capability has 0x100 bytes of aperture */
  35                 case 0x80:
  36                         capdata |= 0x40 << 8; break;
  37                         /* WUSB capability has 0x80 bytes of aperture
  38                          * and ID is 1 */
  39                 case 0x02:
  40                         capdata &= ~0xffff;
  41                         capdata |= 0x2001;
  42                         break;
  43                 }
  44         }
  45         if (capdata_orig != capdata)
  46                 dev_warn(&pci_dev->dev,
  47                          "PCI v%04x d%04x c%06x#%02x: "
  48                          "corrected capdata from %016Lx to %016Lx\n",
  49                          pci_dev->vendor, pci_dev->device, pci_dev->class,
  50                          (unsigned)UWBCAPDATA_TO_CAP_ID(capdata),
  51                          (unsigned long long)capdata_orig,
  52                          (unsigned long long)capdata);
  53         return capdata;
  54 }
  55
  56
  57 /**
  58  * whci_wait_for - wait for a WHCI register to be set
  59  *
  60  * Polls (for at most @max_ms ms) until '*@reg & @mask == @result'.
  61  */
  62 int whci_wait_for(struct device *dev, u32 __iomem *reg, u32 mask, u32 result,
  63         unsigned long max_ms, const char *tag)
  64 {
  65         unsigned t = 0;
  66         u32 val;
  67         for (;;) {
  68                 val = le_readl(reg);
  69                 if ((val & mask) == result)
  70                         break;
  71                 if (t >= max_ms) {
  72                         dev_err(dev, "%s timed out\n", tag);
  73                         return -ETIMEDOUT;
  74                 }
  75                 msleep(10);
  76                 t += 10;
  77         }
  78         return 0;
  79 }
  80 EXPORT_SYMBOL_GPL(whci_wait_for);
  81
  82
  83 /*
  84  * NOTE: the capinfo and capdata registers are slightly different
  85  *       (size and cap-id fields). So for cap #0, we need to fill
  86  *       in. Size comes from the size of the register block
  87  *       (statically calculated); cap_id comes from nowhere, we use
  88  *       zero, that is reserved, for the radio controller, because
  89  *       none was defined at the spec level.
  90  */
  91 static int whci_add_cap(struct whci_card *card, int n)
  92 {
  93         struct umc_dev *umc;
  94         u64 capdata;
  95         int bar, err;
  96
  97         umc = umc_device_create(&card->pci->dev, n);
  98         if (umc == NULL)
  99                 return -ENOMEM;
 100
 101         capdata = le_readq(card->uwbbase + UWBCAPDATA(n));
 102
 103         bar = UWBCAPDATA_TO_BAR(capdata) << 1;
 104
 105         capdata = whci_capdata_quirks(card, capdata);
 106         /* Capability 0 is the radio controller. It's size is 32
 107          * bytes (WHCI0.95[2.3, T2-9]). */
 108         umc->version         = UWBCAPDATA_TO_VERSION(capdata);
 109         umc->cap_id          = n == 0 ? 0 : UWBCAPDATA_TO_CAP_ID(capdata);
 110         umc->bar             = bar;
 111         umc->resource.start  = pci_resource_start(card->pci, bar)
 112                 + UWBCAPDATA_TO_OFFSET(capdata);
 113         umc->resource.end    = umc->resource.start
 114                 + (n == 0 ? 0x20 : UWBCAPDATA_TO_SIZE(capdata)) - 1;
 115         umc->resource.name   = dev_name(&umc->dev);
 116         umc->resource.flags  = card->pci->resource[bar].flags;
 117         umc->resource.parent = &card->pci->resource[bar];
 118         umc->irq             = card->pci->irq;
 119
 120         err = umc_device_register(umc);
 121         if (err < 0)
 122                 goto error;
 123         card->devs[n] = umc;
 124         return 0;
 125
 126 error:
 127         kfree(umc);
 128         return err;
 129 }
 130
 131 static void whci_del_cap(struct whci_card *card, int n)
 132 {
 133         struct umc_dev *umc = card->devs[n];
 134
 135         if (umc != NULL)
 136                 umc_device_unregister(umc);
 137 }
 138
 139 static int whci_n_caps(struct pci_dev *pci)
 140 {
 141         void __iomem *uwbbase;
 142         u64 capinfo;
 143
 144         uwbbase = pci_iomap(pci, 0, 8);
 145         if (!uwbbase)
 146                 return -ENOMEM;
 147         capinfo = le_readq(uwbbase + UWBCAPINFO);
 148         pci_iounmap(pci, uwbbase);
 149
 150         return UWBCAPINFO_TO_N_CAPS(capinfo);
 151 }
 152
 153 static int whci_probe(struct pci_dev *pci, const struct pci_device_id *id)
 154 {
 155         struct whci_card *card;
 156         int err, n_caps, n;
 157
 158         err = pci_enable_device(pci);
 159         if (err < 0)
 160                 goto error;
 161         pci_enable_msi(pci);
 162         pci_set_master(pci);
 163         err = -ENXIO;
 164         if (!pci_set_dma_mask(pci, DMA_BIT_MASK(64)))
 165                 pci_set_consistent_dma_mask(pci, DMA_BIT_MASK(64));
 166         else if (!pci_set_dma_mask(pci, DMA_BIT_MASK(32)))
 167                 pci_set_consistent_dma_mask(pci, DMA_BIT_MASK(32));
 168         else
 169                 goto error_dma;
 170
 171         err = n_caps = whci_n_caps(pci);
 172         if (n_caps < 0)
 173                 goto error_ncaps;
 174
 175         err = -ENOMEM;
 176         card = kzalloc(sizeof(struct whci_card)
 177                        + sizeof(struct whci_dev *) * (n_caps + 1),
 178                        GFP_KERNEL);
 179         if (card == NULL)
 180                 goto error_kzalloc;
 181         card->pci = pci;
 182         card->n_caps = n_caps;
 183
 184         err = -EBUSY;
 185         if (!request_mem_region(pci_resource_start(pci, 0),
 186                                 UWBCAPDATA_SIZE(card->n_caps),
 187                                 "whci (capability data)"))
 188                 goto error_request_memregion;
 189         err = -ENOMEM;
 190         card->uwbbase = pci_iomap(pci, 0, UWBCAPDATA_SIZE(card->n_caps));
 191         if (!card->uwbbase)
 192                 goto error_iomap;
 193
 194         /* Add each capability. */
 195         for (n = 0; n <= card->n_caps; n++) {
 196                 err = whci_add_cap(card, n);
 197                 if (err < 0 && n == 0) {
 198                         dev_err(&pci->dev, "cannot bind UWB radio controller:"
 199                                 " %d\n", err);
 200                         goto error_bind;
 201                 }
 202                 if (err < 0)
 203                         dev_warn(&pci->dev, "warning: cannot bind capability "
 204                                  "#%u: %d\n", n, err);
 205         }
 206         pci_set_drvdata(pci, card);
 207         return 0;
 208
 209 error_bind:
 210         pci_iounmap(pci, card->uwbbase);
 211 error_iomap:
 212         release_mem_region(pci_resource_start(pci, 0), UWBCAPDATA_SIZE(card->n_caps));
 213 error_request_memregion:
 214         kfree(card);
 215 error_kzalloc:
 216 error_ncaps:
 217 error_dma:
 218         pci_disable_msi(pci);
 219         pci_disable_device(pci);
 220 error:
 221         return err;
 222 }
 223
 224 static void whci_remove(struct pci_dev *pci)
 225 {
 226         struct whci_card *card = pci_get_drvdata(pci);
 227         int n;
 228
 229         pci_set_drvdata(pci, NULL);
 230         /* Unregister each capability in reverse (so the master device
 231          * is unregistered last). */
 232         for (n = card->n_caps; n >= 0 ; n--)
 233                 whci_del_cap(card, n);
 234         pci_iounmap(pci, card->uwbbase);
 235         release_mem_region(pci_resource_start(pci, 0), UWBCAPDATA_SIZE(card->n_caps));
 236         kfree(card);
 237         pci_disable_msi(pci);
 238         pci_disable_device(pci);
 239 }
 240
 241 static struct pci_device_id whci_id_table[] = {
 242         { PCI_DEVICE_CLASS(PCI_CLASS_WIRELESS_WHCI, ~0) },
 243         { 0 },
 244 };
 245 MODULE_DEVICE_TABLE(pci, whci_id_table);
 246
 247
 248 static struct pci_driver whci_driver = {
 249         .name     = "whci",
 250         .id_table = whci_id_table,
 251         .probe    = whci_probe,
 252         .remove   = whci_remove,
 253 };
 254
 255 static int __init whci_init(void)
 256 {
 257         return pci_register_driver(&whci_driver);
 258 }
 259
 260 static void __exit whci_exit(void)
 261 {
 262         pci_unregister_driver(&whci_driver);
 263 }
 264
 265 module_init(whci_init);
 266 module_exit(whci_exit);
 267
 268 MODULE_DESCRIPTION("WHCI UWB Multi-interface Controller enumerator");
 269 MODULE_AUTHOR("Cambridge Silicon Radio Ltd.");
 270 MODULE_LICENSE("GPL");