uwb: add the driver to enumerate WHCI capabilities
This enumerates the capabilties of a WHCI device, adding a umc device for each one. Signed-off-by: David Vrabel <david.vrabel@csr.com>
This commit is contained in:
David Vrabel
committed by
David Vrabel
David Vrabel
parent
da389eac31
commit
8f1b678ab9
269
drivers/uwb/whci.c
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269
drivers/uwb/whci.c
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/*
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* WHCI UWB Multi-interface Controller enumerator.
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*
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* Copyright (C) 2007 Cambridge Silicon Radio Ltd.
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*
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* This file is released under the GNU GPL v2.
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*/
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#include <linux/delay.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/dma-mapping.h>
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#include <linux/uwb/whci.h>
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#include <linux/uwb/umc.h>
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struct whci_card {
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struct pci_dev *pci;
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void __iomem *uwbbase;
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u8 n_caps;
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struct umc_dev *devs[0];
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};
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/* Fix faulty HW :( */
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static
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u64 whci_capdata_quirks(struct whci_card *card, u64 capdata)
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{
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u64 capdata_orig = capdata;
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struct pci_dev *pci_dev = card->pci;
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if (pci_dev->vendor == PCI_VENDOR_ID_INTEL
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&& (pci_dev->device == 0x0c3b || pci_dev->device == 0004)
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&& pci_dev->class == 0x0d1010) {
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switch (UWBCAPDATA_TO_CAP_ID(capdata)) {
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/* WLP capability has 0x100 bytes of aperture */
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case 0x80:
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capdata |= 0x40 << 8; break;
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/* WUSB capability has 0x80 bytes of aperture
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* and ID is 1 */
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case 0x02:
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capdata &= ~0xffff;
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capdata |= 0x2001;
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break;
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}
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}
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if (capdata_orig != capdata)
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dev_warn(&pci_dev->dev,
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"PCI v%04x d%04x c%06x#%02x: "
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"corrected capdata from %016Lx to %016Lx\n",
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pci_dev->vendor, pci_dev->device, pci_dev->class,
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(unsigned)UWBCAPDATA_TO_CAP_ID(capdata),
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(unsigned long long)capdata_orig,
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(unsigned long long)capdata);
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return capdata;
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}
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/**
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* whci_wait_for - wait for a WHCI register to be set
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*
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* Polls (for at most @max_ms ms) until '*@reg & @mask == @result'.
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*/
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int whci_wait_for(struct device *dev, u32 __iomem *reg, u32 mask, u32 result,
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unsigned long max_ms, const char *tag)
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{
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unsigned t = 0;
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u32 val;
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for (;;) {
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val = le_readl(reg);
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if ((val & mask) == result)
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break;
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msleep(10);
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if (t >= max_ms) {
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dev_err(dev, "timed out waiting for %s ", tag);
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return -ETIMEDOUT;
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}
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t += 10;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(whci_wait_for);
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/*
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* NOTE: the capinfo and capdata registers are slightly different
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* (size and cap-id fields). So for cap #0, we need to fill
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* in. Size comes from the size of the register block
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* (statically calculated); cap_id comes from nowhere, we use
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* zero, that is reserved, for the radio controller, because
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* none was defined at the spec level.
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*/
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static int whci_add_cap(struct whci_card *card, int n)
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{
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struct umc_dev *umc;
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u64 capdata;
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int bar, err;
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umc = umc_device_create(&card->pci->dev, n);
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if (umc == NULL)
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return -ENOMEM;
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capdata = le_readq(card->uwbbase + UWBCAPDATA(n));
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bar = UWBCAPDATA_TO_BAR(capdata) << 1;
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capdata = whci_capdata_quirks(card, capdata);
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/* Capability 0 is the radio controller. It's size is 32
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* bytes (WHCI0.95[2.3, T2-9]). */
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umc->version = UWBCAPDATA_TO_VERSION(capdata);
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umc->cap_id = n == 0 ? 0 : UWBCAPDATA_TO_CAP_ID(capdata);
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umc->bar = bar;
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umc->resource.start = pci_resource_start(card->pci, bar)
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+ UWBCAPDATA_TO_OFFSET(capdata);
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umc->resource.end = umc->resource.start
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+ (n == 0 ? 0x20 : UWBCAPDATA_TO_SIZE(capdata)) - 1;
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umc->resource.name = umc->dev.bus_id;
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umc->resource.flags = card->pci->resource[bar].flags;
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umc->resource.parent = &card->pci->resource[bar];
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umc->irq = card->pci->irq;
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err = umc_device_register(umc);
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if (err < 0)
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goto error;
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card->devs[n] = umc;
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return 0;
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error:
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kfree(umc);
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return err;
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}
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static void whci_del_cap(struct whci_card *card, int n)
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{
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struct umc_dev *umc = card->devs[n];
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if (umc != NULL)
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umc_device_unregister(umc);
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}
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static int whci_n_caps(struct pci_dev *pci)
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{
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void __iomem *uwbbase;
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u64 capinfo;
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uwbbase = pci_iomap(pci, 0, 8);
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if (!uwbbase)
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return -ENOMEM;
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capinfo = le_readq(uwbbase + UWBCAPINFO);
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pci_iounmap(pci, uwbbase);
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return UWBCAPINFO_TO_N_CAPS(capinfo);
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}
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static int whci_probe(struct pci_dev *pci, const struct pci_device_id *id)
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{
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struct whci_card *card;
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int err, n_caps, n;
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err = pci_enable_device(pci);
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if (err < 0)
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goto error;
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pci_enable_msi(pci);
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pci_set_master(pci);
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err = -ENXIO;
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if (!pci_set_dma_mask(pci, DMA_64BIT_MASK))
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pci_set_consistent_dma_mask(pci, DMA_64BIT_MASK);
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else if (!pci_set_dma_mask(pci, DMA_32BIT_MASK))
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pci_set_consistent_dma_mask(pci, DMA_32BIT_MASK);
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else
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goto error_dma;
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err = n_caps = whci_n_caps(pci);
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if (n_caps < 0)
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goto error_ncaps;
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err = -ENOMEM;
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card = kzalloc(sizeof(struct whci_card)
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+ sizeof(struct whci_dev *) * (n_caps + 1),
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GFP_KERNEL);
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if (card == NULL)
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goto error_kzalloc;
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card->pci = pci;
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card->n_caps = n_caps;
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err = -EBUSY;
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if (!request_mem_region(pci_resource_start(pci, 0),
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UWBCAPDATA_SIZE(card->n_caps),
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"whci (capability data)"))
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goto error_request_memregion;
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err = -ENOMEM;
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card->uwbbase = pci_iomap(pci, 0, UWBCAPDATA_SIZE(card->n_caps));
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if (!card->uwbbase)
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goto error_iomap;
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/* Add each capability. */
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for (n = 0; n <= card->n_caps; n++) {
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err = whci_add_cap(card, n);
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if (err < 0 && n == 0) {
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dev_err(&pci->dev, "cannot bind UWB radio controller:"
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" %d\n", err);
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goto error_bind;
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}
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if (err < 0)
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dev_warn(&pci->dev, "warning: cannot bind capability "
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"#%u: %d\n", n, err);
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}
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pci_set_drvdata(pci, card);
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return 0;
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error_bind:
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pci_iounmap(pci, card->uwbbase);
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error_iomap:
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release_mem_region(pci_resource_start(pci, 0), UWBCAPDATA_SIZE(card->n_caps));
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error_request_memregion:
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kfree(card);
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error_kzalloc:
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error_ncaps:
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error_dma:
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pci_disable_msi(pci);
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pci_disable_device(pci);
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error:
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return err;
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}
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static void whci_remove(struct pci_dev *pci)
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{
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struct whci_card *card = pci_get_drvdata(pci);
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int n;
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pci_set_drvdata(pci, NULL);
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/* Unregister each capability in reverse (so the master device
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* is unregistered last). */
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for (n = card->n_caps; n >= 0 ; n--)
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whci_del_cap(card, n);
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pci_iounmap(pci, card->uwbbase);
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release_mem_region(pci_resource_start(pci, 0), UWBCAPDATA_SIZE(card->n_caps));
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kfree(card);
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pci_disable_msi(pci);
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pci_disable_device(pci);
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}
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static struct pci_device_id whci_id_table[] = {
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{ PCI_DEVICE_CLASS(PCI_CLASS_WIRELESS_WHCI, ~0) },
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{ 0 },
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};
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MODULE_DEVICE_TABLE(pci, whci_id_table);
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static struct pci_driver whci_driver = {
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.name = "whci",
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.id_table = whci_id_table,
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.probe = whci_probe,
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.remove = whci_remove,
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};
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static int __init whci_init(void)
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{
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return pci_register_driver(&whci_driver);
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}
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static void __exit whci_exit(void)
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{
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pci_unregister_driver(&whci_driver);
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}
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module_init(whci_init);
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module_exit(whci_exit);
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MODULE_DESCRIPTION("WHCI UWB Multi-interface Controller enumerator");
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MODULE_AUTHOR("Cambridge Silicon Radio Ltd.");
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MODULE_LICENSE("GPL");
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