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authorDavid Vrabel <david.vrabel@csr.com>2008-09-17 16:34:13 +0100
committerDavid Vrabel <dv02@dv02pc01.europe.root.pri>2008-09-17 16:54:26 +0100
commit8f1b678ab900c2bda1620dfb6e1f1f02604fc3a2 (patch)
treef85bc7141e6d242ae0d1e7f4ebb1fddf12455f6e /drivers/uwb/whci.c
parentda389eac31be24556a71dd59ea6539ae4cba5c15 (diff)
downloadlinux-linaro-stable-8f1b678ab900c2bda1620dfb6e1f1f02604fc3a2.tar.gz
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>
Diffstat (limited to 'drivers/uwb/whci.c')
-rw-r--r--drivers/uwb/whci.c269
1 files changed, 269 insertions, 0 deletions
diff --git a/drivers/uwb/whci.c b/drivers/uwb/whci.c
new file mode 100644
index 000000000000..3df2388f908f
--- /dev/null
+++ b/drivers/uwb/whci.c
@@ -0,0 +1,269 @@
+/*
+ * 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;
+ msleep(10);
+ if (t >= max_ms) {
+ dev_err(dev, "timed out waiting for %s ", tag);
+ return -ETIMEDOUT;
+ }
+ 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 = umc->dev.bus_id;
+ 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_64BIT_MASK))
+ pci_set_consistent_dma_mask(pci, DMA_64BIT_MASK);
+ else if (!pci_set_dma_mask(pci, DMA_32BIT_MASK))
+ pci_set_consistent_dma_mask(pci, DMA_32BIT_MASK);
+ 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");