wusb: WHCI host controller driver

A driver for Wireless USB host controllers that comply with the
Wireless Host Controller Interface (HCI) specification as published by
Intel.

The latest publically available version of the specification (0.95) is
supported (except for isochronous transfers).

Build fixes by Randy Dunlap <rdunlap@xenotime.net>

Signed-off-by: David Vrabel <david.vrabel@csr.com>

1 files changed, 188 insertions, 0 deletions

diff --git a/drivers/usb/host/whci/init.c b/drivers/usb/host/whci/init.c
new file mode 100644
index 0000000..34a783c
--- /dev/null
+++ b/drivers/usb/host/whci/init.c
@@ -0,0 +1,188 @@
+/*
+ * Wireless Host Controller (WHC) initialization.
+ *
+ * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/kernel.h>
+#include <linux/dma-mapping.h>
+#include <linux/uwb/umc.h>
+
+#include "../../wusbcore/wusbhc.h"
+
+#include "whcd.h"
+
+/*
+ * Reset the host controller.
+ */
+static void whc_hw_reset(struct whc *whc)
+{
+	le_writel(WUSBCMD_WHCRESET, whc->base + WUSBCMD);
+	whci_wait_for(&whc->umc->dev, whc->base + WUSBCMD, WUSBCMD_WHCRESET, 0,
+		      100, "reset");
+}
+
+static void whc_hw_init_di_buf(struct whc *whc)
+{
+	int d;
+
+	/* Disable all entries in the Device Information buffer. */
+	for (d = 0; d < whc->n_devices; d++)
+		whc->di_buf[d].addr_sec_info = WHC_DI_DISABLE;
+
+	le_writeq(whc->di_buf_dma, whc->base + WUSBDEVICEINFOADDR);
+}
+
+static void whc_hw_init_dn_buf(struct whc *whc)
+{
+	/* Clear the Device Notification buffer to ensure the V (valid)
+	 * bits are clear.  */
+	memset(whc->dn_buf, 0, 4096);
+
+	le_writeq(whc->dn_buf_dma, whc->base + WUSBDNTSBUFADDR);
+}
+
+int whc_init(struct whc *whc)
+{
+	u32 whcsparams;
+	int ret, i;
+	resource_size_t start, len;
+
+	spin_lock_init(&whc->lock);
+	mutex_init(&whc->mutex);
+	init_waitqueue_head(&whc->cmd_wq);
+	init_waitqueue_head(&whc->async_list_wq);
+	init_waitqueue_head(&whc->periodic_list_wq);
+	whc->workqueue = create_singlethread_workqueue(dev_name(&whc->umc->dev));
+	if (whc->workqueue == NULL) {
+		ret = -ENOMEM;
+		goto error;
+	}
+	INIT_WORK(&whc->dn_work, whc_dn_work);
+
+	INIT_WORK(&whc->async_work, scan_async_work);
+	INIT_LIST_HEAD(&whc->async_list);
+	INIT_LIST_HEAD(&whc->async_removed_list);
+
+	INIT_WORK(&whc->periodic_work, scan_periodic_work);
+	for (i = 0; i < 5; i++)
+		INIT_LIST_HEAD(&whc->periodic_list[i]);
+	INIT_LIST_HEAD(&whc->periodic_removed_list);
+
+	/* Map HC registers. */
+	start = whc->umc->resource.start;
+	len   = whc->umc->resource.end - start + 1;
+	if (!request_mem_region(start, len, "whci-hc")) {
+		dev_err(&whc->umc->dev, "can't request HC region\n");
+		ret = -EBUSY;
+		goto error;
+	}
+	whc->base_phys = start;
+	whc->base = ioremap(start, len);
+	if (!whc->base) {
+		dev_err(&whc->umc->dev, "ioremap\n");
+		ret = -ENOMEM;
+		goto error;
+	}
+
+	whc_hw_reset(whc);
+
+	/* Read maximum number of devices, keys and MMC IEs. */
+	whcsparams = le_readl(whc->base + WHCSPARAMS);
+	whc->n_devices = WHCSPARAMS_TO_N_DEVICES(whcsparams);
+	whc->n_keys    = WHCSPARAMS_TO_N_KEYS(whcsparams);
+	whc->n_mmc_ies = WHCSPARAMS_TO_N_MMC_IES(whcsparams);
+
+	dev_dbg(&whc->umc->dev, "N_DEVICES = %d, N_KEYS = %d, N_MMC_IES = %d\n",
+		whc->n_devices, whc->n_keys, whc->n_mmc_ies);
+
+	whc->qset_pool = dma_pool_create("qset", &whc->umc->dev,
+					 sizeof(struct whc_qset), 64, 0);
+	if (whc->qset_pool == NULL) {
+		ret = -ENOMEM;
+		goto error;
+	}
+
+	ret = asl_init(whc);
+	if (ret < 0)
+		goto error;
+	ret = pzl_init(whc);
+	if (ret < 0)
+		goto error;
+
+	/* Allocate and initialize a buffer for generic commands, the
+	   Device Information buffer, and the Device Notification
+	   buffer. */
+
+	whc->gen_cmd_buf = dma_alloc_coherent(&whc->umc->dev, WHC_GEN_CMD_DATA_LEN,
+					      &whc->gen_cmd_buf_dma, GFP_KERNEL);
+	if (whc->gen_cmd_buf == NULL) {
+		ret = -ENOMEM;
+		goto error;
+	}
+
+	whc->dn_buf = dma_alloc_coherent(&whc->umc->dev,
+					 sizeof(struct dn_buf_entry) * WHC_N_DN_ENTRIES,
+					 &whc->dn_buf_dma, GFP_KERNEL);
+	if (!whc->dn_buf) {
+		ret = -ENOMEM;
+		goto error;
+	}
+	whc_hw_init_dn_buf(whc);
+
+	whc->di_buf = dma_alloc_coherent(&whc->umc->dev,
+					 sizeof(struct di_buf_entry) * whc->n_devices,
+					 &whc->di_buf_dma, GFP_KERNEL);
+	if (!whc->di_buf) {
+		ret = -ENOMEM;
+		goto error;
+	}
+	whc_hw_init_di_buf(whc);
+
+	return 0;
+
+error:
+	whc_clean_up(whc);
+	return ret;
+}
+
+void whc_clean_up(struct whc *whc)
+{
+	resource_size_t len;
+
+	if (whc->di_buf)
+		dma_free_coherent(&whc->umc->dev, sizeof(struct di_buf_entry) * whc->n_devices,
+				  whc->di_buf, whc->di_buf_dma);
+	if (whc->dn_buf)
+		dma_free_coherent(&whc->umc->dev, sizeof(struct dn_buf_entry) * WHC_N_DN_ENTRIES,
+				  whc->dn_buf, whc->dn_buf_dma);
+	if (whc->gen_cmd_buf)
+		dma_free_coherent(&whc->umc->dev, WHC_GEN_CMD_DATA_LEN,
+				  whc->gen_cmd_buf, whc->gen_cmd_buf_dma);
+
+	pzl_clean_up(whc);
+	asl_clean_up(whc);
+
+	if (whc->qset_pool)
+		dma_pool_destroy(whc->qset_pool);
+
+	len   = whc->umc->resource.end - whc->umc->resource.start + 1;
+	if (whc->base)
+		iounmap(whc->base);
+	if (whc->base_phys)
+		release_mem_region(whc->base_phys, len);
+
+	if (whc->workqueue)
+		destroy_workqueue(whc->workqueue);
+}