[PATCH 2/8] usb: host: xhci-plat: Add support for the Armada 38x glue code
Gregory CLEMENT
gregory.clement at free-electrons.com
Fri Apr 18 03:22:37 PDT 2014
For the armada 38x SoCs which come with an xhci controller, specific
initialization must be done during probe, especially in relation with
the MBus windows initialization. This patch adds this support.
Signed-off-by: Gregory CLEMENT <gregory.clement at free-electrons.com>
---
drivers/usb/host/Kconfig | 7 +++
drivers/usb/host/Makefile | 1 +
drivers/usb/host/xhci-mvebu.c | 105 ++++++++++++++++++++++++++++++++++++++++++
drivers/usb/host/xhci-mvebu.h | 21 +++++++++
drivers/usb/host/xhci-plat.c | 10 ++++
5 files changed, 144 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 3d9e54062d62..e70943fac4a1 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -29,6 +29,13 @@ if USB_XHCI_HCD
config USB_XHCI_PLATFORM
tristate
+config USB_XHCI_MVEBU
+ tristate "xHCI support for Marvell Armada 38x"
+ select USB_XHCI_PLATFORM
+ ---help---
+ Say 'Y' to enable the support for the xHCI host controller
+ found in Marvell Armada 38x ARM SOCs.
+
endif # USB_XHCI_HCD
config USB_EHCI_HCD
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 7530468c9a4f..7a8db7f7dc01 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -19,6 +19,7 @@ xhci-hcd-$(CONFIG_PCI) += xhci-pci.o
ifneq ($(CONFIG_USB_XHCI_PLATFORM), )
xhci-hcd-y += xhci-plat.o
+ xhci-hcd-$(CONFIG_USB_XHCI_MVEBU) += xhci-mvebu.o
endif
obj-$(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 000000000000..dc9c7648ab65
--- /dev/null
+++ b/drivers/usb/host/xhci-mvebu.c
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2014 Marvell
+ * Author: Gregory CLEMENT <gregory.clement at 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/clk.h>
+#include <linux/io.h>
+#include <linux/mbus.h>
+#include <linux/of.h>
+#include <linux/platform_device.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 __init mv_usb3_conf_mbus_windows(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_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ void __iomem *base;
+ const struct mbus_dram_target_info *dram;
+ int ret;
+ struct clk *clk;
+
+ 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;
+
+ clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(clk)) {
+ iounmap(base);
+ return PTR_ERR(clk);
+ }
+
+ ret = clk_prepare_enable(clk);
+ if (ret < 0) {
+ iounmap(base);
+ return ret;
+ }
+
+ dram = mv_mbus_dram_info();
+ mv_usb3_conf_mbus_windows(base, dram);
+
+ /*
+ * This memory area was only needed to configure the MBus
+ * windows, and is therefore no longer useful.
+ */
+ iounmap(base);
+
+ ret = common_xhci_plat_probe(pdev, clk);
+ if (ret < 0) {
+ clk_disable_unprepare(clk);
+ return ret;
+ }
+
+ return ret;
+}
+
+int xhci_mvebu_remove(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+ struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+ struct clk *clk = xhci->priv;
+
+ common_xhci_plat_remove(pdev);
+ clk_disable_unprepare(clk);
+
+ return 0;
+}
diff --git a/drivers/usb/host/xhci-mvebu.h b/drivers/usb/host/xhci-mvebu.h
new file mode 100644
index 000000000000..897ef298f22f
--- /dev/null
+++ b/drivers/usb/host/xhci-mvebu.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2014 Marvell
+ *
+ * Gregory Clement <gregory.clement at free-electrons.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#ifndef __LINUX_XHCI_MVEBU_H
+#define __LINUX_XHCI_MVEBU_H
+
+#ifdef CONFIG_USB_XHCI_MVEBU
+int xhci_mvebu_probe(struct platform_device *pdev);
+int xhci_mvebu_remove(struct platform_device *pdev);
+#else
+#define xhci_mvebu_probe NULL
+#define xhci_mvebu_remove NULL
+#endif
+#endif /* __LINUX_XHCI_MVEBU_H */
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 8029cc82edc4..f1261d3848a9 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -19,6 +19,7 @@
#include <linux/of_device.h>
#include "xhci.h"
+#include "xhci-mvebu.h"
static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
{
@@ -250,6 +251,11 @@ static const struct dev_pm_ops xhci_plat_pm_ops = {
#endif /* CONFIG_PM */
#ifdef CONFIG_OF
+struct xhci_plat_ops xhci_plat_mvebu = {
+ .probe = xhci_mvebu_probe,
+ .remove = xhci_mvebu_remove,
+};
+
static const struct of_device_id usb_xhci_of_match[] = {
{
.compatible = "generic-xhci",
@@ -259,6 +265,10 @@ static const struct of_device_id usb_xhci_of_match[] = {
.compatible = "xhci-platform",
.data = (void *) &xhci_plat_default,
},
+ {
+ .compatible = "marvell,xhci-armada-380",
+ .data = (void *) &xhci_plat_mvebu,
+ },
{ },
};
MODULE_DEVICE_TABLE(of, usb_xhci_of_match);
--
1.8.1.2
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