1 files changed, 93 insertions, 0 deletions
diff --git a/drivers/usb/host/whci/hw.c b/drivers/usb/host/whci/hw.c
new file mode 100644
index 000000000..22b3b7f74
--- /dev/null
+++ b/drivers/usb/host/whci/hw.c
@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Wireless Host Controller (WHC) hardware access helpers.
+ *
+ * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
+ */
+#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);
+}