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path: root/drivers/usb/host/xhci-mvebu.c
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Diffstat (limited to 'drivers/usb/host/xhci-mvebu.c')
-rw-r--r--drivers/usb/host/xhci-mvebu.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-mvebu.c b/drivers/usb/host/xhci-mvebu.c
new file mode 100644
index 0000000000..87f1597a0e
--- /dev/null
+++ b/drivers/usb/host/xhci-mvebu.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2014 Marvell
+ * Author: Gregory CLEMENT <gregory.clement@free-electrons.com>
+ */
+
+#include <linux/io.h>
+#include <linux/mbus.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+
+#include "xhci-mvebu.h"
+#include "xhci.h"
+
+#define USB3_MAX_WINDOWS 4
+#define USB3_WIN_CTRL(w) (0x0 + ((w) * 8))
+#define USB3_WIN_BASE(w) (0x4 + ((w) * 8))
+
+static void xhci_mvebu_mbus_config(void __iomem *base,
+ const struct mbus_dram_target_info *dram)
+{
+ int win;
+
+ /* Clear all existing windows */
+ for (win = 0; win < USB3_MAX_WINDOWS; win++) {
+ writel(0, base + USB3_WIN_CTRL(win));
+ writel(0, base + USB3_WIN_BASE(win));
+ }
+
+ /* Program each DRAM CS in a seperate window */
+ for (win = 0; win < dram->num_cs; win++) {
+ const struct mbus_dram_window *cs = &dram->cs[win];
+
+ writel(((cs->size - 1) & 0xffff0000) | (cs->mbus_attr << 8) |
+ (dram->mbus_dram_target_id << 4) | 1,
+ base + USB3_WIN_CTRL(win));
+
+ writel((cs->base & 0xffff0000), base + USB3_WIN_BASE(win));
+ }
+}
+
+int xhci_mvebu_mbus_init_quirk(struct usb_hcd *hcd)
+{
+ struct device *dev = hcd->self.controller;
+ struct platform_device *pdev = to_platform_device(dev);
+ struct resource *res;
+ void __iomem *base;
+ const struct mbus_dram_target_info *dram;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!res)
+ return -ENODEV;
+
+ /*
+ * We don't use devm_ioremap() because this mapping should
+ * only exists for the duration of this probe function.
+ */
+ base = ioremap(res->start, resource_size(res));
+ if (!base)
+ return -ENODEV;
+
+ dram = mv_mbus_dram_info();
+ xhci_mvebu_mbus_config(base, dram);
+
+ /*
+ * This memory area was only needed to configure the MBus
+ * windows, and is therefore no longer useful.
+ */
+ iounmap(base);
+
+ return 0;
+}
+
+int xhci_mvebu_a3700_init_quirk(struct usb_hcd *hcd)
+{
+ struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+
+ /* Without reset on resume, the HC won't work at all */
+ xhci->quirks |= XHCI_RESET_ON_RESUME;
+
+ return 0;
+}