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>

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");