/* * WHCI UWB Multi-interface Controller enumerator. * * Copyright (C) 2007 Cambridge Silicon Radio Ltd. * * This file is released under the GNU GPL v2. */ #include <linux/delay.h> #include <linux/kernel.h> #include <linux/pci.h> #include <linux/dma-mapping.h> #include <linux/uwb/whci.h> #include <linux/uwb/umc.h> struct whci_card { struct pci_dev *pci; void __iomem *uwbbase; u8 n_caps; struct umc_dev *devs[0]; }; /* Fix faulty HW :( */ static u64 whci_capdata_quirks(struct whci_card *card, u64 capdata) { u64 capdata_orig = capdata; struct pci_dev *pci_dev = card->pci; if (pci_dev->vendor == PCI_VENDOR_ID_INTEL && (pci_dev->device == 0x0c3b || pci_dev->device == 0004) && pci_dev->class == 0x0d1010) { switch (UWBCAPDATA_TO_CAP_ID(capdata)) { /* WLP capability has 0x100 bytes of aperture */ case 0x80: capdata |= 0x40 << 8; break; /* WUSB capability has 0x80 bytes of aperture * and ID is 1 */ case 0x02: capdata &= ~0xffff; capdata |= 0x2001; break; } } if (capdata_orig != capdata) dev_warn(&pci_dev->dev, "PCI v%04x d%04x c%06x#%02x: " "corrected capdata from %016Lx to %016Lx\n", pci_dev->vendor, pci_dev->device, pci_dev->class, (unsigned)UWBCAPDATA_TO_CAP_ID(capdata), (unsigned long long)capdata_orig, (unsigned long long)capdata); return capdata; } /** * whci_wait_for - wait for a WHCI register to be set * * Polls (for at most @max_ms ms) until '*@reg & @mask == @result'. */ int whci_wait_for(struct device *dev, u32 __iomem *reg, u32 mask, u32 result, unsigned long max_ms, const char *tag) { unsigned t = 0; u32 val; for (;;) { val = le_readl(reg); if ((val & mask) == result) break; if (t >= max_ms) { dev_err(dev, "%s timed out\n", tag); return -ETIMEDOUT; } msleep(10); t += 10; } return 0; } EXPORT_SYMBOL_GPL(whci_wait_for); /* * NOTE: the capinfo and capdata registers are slightly different * (size and cap-id fields). So for cap #0, we need to fill * in. Size comes from the size of the register block * (statically calculated); cap_id comes from nowhere, we use * zero, that is reserved, for the radio controller, because * none was defined at the spec level. */ static int whci_add_cap(struct whci_card *card, int n) { struct umc_dev *umc; u64 capdata; int bar, err; umc = umc_device_create(&card->pci->dev, n); if (umc == NULL) return -ENOMEM; capdata = le_readq(card->uwbbase + UWBCAPDATA(n)); bar = UWBCAPDATA_TO_BAR(capdata) << 1; capdata = whci_capdata_quirks(card, capdata); /* Capability 0 is the radio controller. It's size is 32 * bytes (WHCI0.95[2.3, T2-9]). */ umc->version = UWBCAPDATA_TO_VERSION(capdata); umc->cap_id = n == 0 ? 0 : UWBCAPDATA_TO_CAP_ID(capdata); umc->bar = bar; umc->resource.start = pci_resource_start(card->pci, bar) + UWBCAPDATA_TO_OFFSET(capdata); umc->resource.end = umc->resource.start + (n == 0 ? 0x20 : UWBCAPDATA_TO_SIZE(capdata)) - 1; umc->resource.name = dev_name(&umc->dev); umc->resource.flags = card->pci->resource[bar].flags; umc->resource.parent = &card->pci->resource[bar]; umc->irq = card->pci->irq; err = umc_device_register(umc); if (err < 0) goto error; card->devs[n] = umc; return 0; error: kfree(umc); return err; } static void whci_del_cap(struct whci_card *card, int n) { struct umc_dev *umc = card->devs[n]; if (umc != NULL) umc_device_unregister(umc); } static int whci_n_caps(struct pci_dev *pci) { void __iomem *uwbbase; u64 capinfo; uwbbase = pci_iomap(pci, 0, 8); if (!uwbbase) return -ENOMEM; capinfo = le_readq(uwbbase + UWBCAPINFO); pci_iounmap(pci, uwbbase); return UWBCAPINFO_TO_N_CAPS(capinfo); } static int whci_probe(struct pci_dev *pci, const struct pci_device_id *id) { struct whci_card *card; int err, n_caps, n; err = pci_enable_device(pci); if (err < 0) goto error; pci_enable_msi(pci); pci_set_master(pci); err = -ENXIO; if (!pci_set_dma_mask(pci, DMA_BIT_MASK(64))) pci_set_consistent_dma_mask(pci, DMA_BIT_MASK(64)); else if (!pci_set_dma_mask(pci, DMA_BIT_MASK(32))) pci_set_consistent_dma_mask(pci, DMA_BIT_MASK(32)); else goto error_dma; err = n_caps = whci_n_caps(pci); if (n_caps < 0) goto error_ncaps; err = -ENOMEM; card = kzalloc(sizeof(struct whci_card) + sizeof(struct whci_dev *) * (n_caps + 1), GFP_KERNEL); if (card == NULL) goto error_kzalloc; card->pci = pci; card->n_caps = n_caps; err = -EBUSY; if (!request_mem_region(pci_resource_start(pci, 0), UWBCAPDATA_SIZE(card->n_caps), "whci (capability data)")) goto error_request_memregion; err = -ENOMEM; card->uwbbase = pci_iomap(pci, 0, UWBCAPDATA_SIZE(card->n_caps)); if (!card->uwbbase) goto error_iomap; /* Add each capability. */ for (n = 0; n <= card->n_caps; n++) { err = whci_add_cap(card, n); if (err < 0 && n == 0) { dev_err(&pci->dev, "cannot bind UWB radio controller:" " %d\n", err); goto error_bind; } if (err < 0) dev_warn(&pci->dev, "warning: cannot bind capability " "#%u: %d\n", n, err); } pci_set_drvdata(pci, card); return 0; error_bind: pci_iounmap(pci, card->uwbbase); error_iomap: release_mem_region(pci_resource_start(pci, 0), UWBCAPDATA_SIZE(card->n_caps)); error_request_memregion: kfree(card); error_kzalloc: error_ncaps: error_dma: pci_disable_msi(pci); pci_disable_device(pci); error: return err; } static void whci_remove(struct pci_dev *pci) { struct whci_card *card = pci_get_drvdata(pci); int n; pci_set_drvdata(pci, NULL); /* Unregister each capability in reverse (so the master device * is unregistered last). */ for (n = card->n_caps; n >= 0 ; n--) whci_del_cap(card, n); pci_iounmap(pci, card->uwbbase); release_mem_region(pci_resource_start(pci, 0), UWBCAPDATA_SIZE(card->n_caps)); kfree(card); pci_disable_msi(pci); pci_disable_device(pci); } static struct pci_device_id whci_id_table[] = { { PCI_DEVICE_CLASS(PCI_CLASS_WIRELESS_WHCI, ~0) }, { 0 }, }; MODULE_DEVICE_TABLE(pci, whci_id_table); static struct pci_driver whci_driver = { .name = "whci", .id_table = whci_id_table, .probe = whci_probe, .remove = whci_remove, }; static int __init whci_init(void) { return pci_register_driver(&whci_driver); } static void __exit whci_exit(void) { pci_unregister_driver(&whci_driver); } module_init(whci_init); module_exit(whci_exit); MODULE_DESCRIPTION("WHCI UWB Multi-interface Controller enumerator"); MODULE_AUTHOR("Cambridge Silicon Radio Ltd."); MODULE_LICENSE("GPL");