[PATCHv5 08/20] usb: host: xhci-plat: add support for the Armada 375/38x XHCI controllers

From: Gregory CLEMENT <redacted>

The Armada 375 and 38x SoCs come with an XHCI controller that requires
some specific initialization related to the MBus windows
configuration. This patch adds the support for this special
configuration as an XHCI quirk executed during probe.

Two new compatible strings are added to identify the Armada 375 and
Armada 38x XHCI controllers, and therefore enable the relevant quirk.

Signed-off-by: Gregory CLEMENT <redacted>
Signed-off-by: Thomas Petazzoni <redacted>
---
  drivers/usb/host/Kconfig      |  8 +++++
  drivers/usb/host/Makefile     |  3 ++
  drivers/usb/host/xhci-mvebu.c | 70 +++++++++++++++++++++++++++++++++++++++++++
  drivers/usb/host/xhci-mvebu.h | 21 +++++++++++++
  drivers/usb/host/xhci-plat.c  | 12 ++++++++
  5 files changed, 114 insertions(+)
  create mode 100644 drivers/usb/host/xhci-mvebu.c
  create mode 100644 drivers/usb/host/xhci-mvebu.h

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 3d9e540..9247ad2 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig

@@ -29,6 +29,14 @@ if USB_XHCI_HCD
  config USB_XHCI_PLATFORM
  	tristate

+config USB_XHCI_MVEBU
+	tristate "xHCI support for Marvell Armada 375/38x"
+	select USB_XHCI_PLATFORM
+	depends on ARCH_MVEBU || COMPILE_TEST
+	---help---
+	  Say 'Y' to enable the support for the xHCI host controller
+	  found in Marvell Armada 375/38x ARM SOCs.
+
  endif # USB_XHCI_HCD

  config USB_EHCI_HCD

diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 7530468..7c0886a 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile

@@ -19,6 +19,9 @@ xhci-hcd-$(CONFIG_PCI)	+= xhci-pci.o

  ifneq ($(CONFIG_USB_XHCI_PLATFORM), )
  	xhci-hcd-y		+= xhci-plat.o
+ifneq ($(CONFIG_USB_XHCI_MVEBU), )
+	xhci-hcd-y		+= xhci-mvebu.o
+endif
  endif

  obj-$(CONFIG_USB_WHCI_HCD)	+= whci/

diff --git a/drivers/usb/host/xhci-mvebu.c b/drivers/usb/host/xhci-mvebu.c
new file mode 100644
index 0000000..fab9d6f
--- /dev/null
+++ b/drivers/usb/host/xhci-mvebu.c

@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2014 Marvell
+ * Author: Gregory CLEMENT <gregory.clement@free-electrons.com>
+ *
+ * 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.
+ */
+
+#include <linux/io.h>
+#include <linux/mbus.h>
+#include <linux/of.h>
+#include <linux/platform_device.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 platform_device *pdev)
+{
+	struct resource	*res;
+	void __iomem *base;
+	const struct mbus_dram_target_info *dram;