Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / usb / host / whci / hw.c

diff --git a/kernel/drivers/usb/host/whci/hw.c b/kernel/drivers/usb/host/whci/hw.c
new file mode 100644 (file)
index 0000000..6afa2e3
--- /dev/null
+++ b/kernel/drivers/usb/host/whci/hw.c
@@ -0,0 +1,104 @@
+/*
+ * Wireless Host Controller (WHC) hardware access helpers.
+ *
+ * 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"
+
+void whc_write_wusbcmd(struct whc *whc, u32 mask, u32 val)
+{
+       unsigned long flags;
+       u32 cmd;
+
+       spin_lock_irqsave(&whc->lock, flags);
+
+       cmd = le_readl(whc->base + WUSBCMD);
+       cmd = (cmd & ~mask) | val;
+       le_writel(cmd, whc->base + WUSBCMD);
+
+       spin_unlock_irqrestore(&whc->lock, flags);
+}
+
+/**
+ * whc_do_gencmd - start a generic command via the WUSBGENCMDSTS register
+ * @whc:    the WHCI HC
+ * @cmd:    command to start.
+ * @params: parameters for the command (the WUSBGENCMDPARAMS register value).
+ * @addr:   pointer to any data for the command (may be NULL).
+ * @len:    length of the data (if any).
+ */
+int whc_do_gencmd(struct whc *whc, u32 cmd, u32 params, void *addr, size_t len)
+{
+       unsigned long flags;
+       dma_addr_t dma_addr;
+       int t;
+       int ret = 0;
+
+       mutex_lock(&whc->mutex);
+
+       /* Wait for previous command to complete. */
+       t = wait_event_timeout(whc->cmd_wq,
+                              (le_readl(whc->base + WUSBGENCMDSTS) & WUSBGENCMDSTS_ACTIVE) == 0,
+                              WHC_GENCMD_TIMEOUT_MS);
+       if (t == 0) {
+               dev_err(&whc->umc->dev, "generic command timeout (%04x/%04x)\n",
+                       le_readl(whc->base + WUSBGENCMDSTS),
+                       le_readl(whc->base + WUSBGENCMDPARAMS));
+               ret = -ETIMEDOUT;
+               goto out;
+       }
+
+       if (addr) {
+               memcpy(whc->gen_cmd_buf, addr, len);
+               dma_addr = whc->gen_cmd_buf_dma;
+       } else
+               dma_addr = 0;
+
+       /* Poke registers to start cmd. */
+       spin_lock_irqsave(&whc->lock, flags);
+
+       le_writel(params, whc->base + WUSBGENCMDPARAMS);
+       le_writeq(dma_addr, whc->base + WUSBGENADDR);
+
+       le_writel(WUSBGENCMDSTS_ACTIVE | WUSBGENCMDSTS_IOC | cmd,
+                 whc->base + WUSBGENCMDSTS);
+
+       spin_unlock_irqrestore(&whc->lock, flags);
+out:
+       mutex_unlock(&whc->mutex);
+
+       return ret;
+}
+
+/**
+ * whc_hw_error - recover from a hardware error
+ * @whc:    the WHCI HC that broke.
+ * @reason: a description of the failure.
+ *
+ * Recover from broken hardware with a full reset.
+ */
+void whc_hw_error(struct whc *whc, const char *reason)
+{
+       struct wusbhc *wusbhc = &whc->wusbhc;
+
+       dev_err(&whc->umc->dev, "hardware error: %s\n", reason);
+       wusbhc_reset_all(wusbhc);
+}