Add Keystone platform specific glue layer to support
USB3 Host mode.
Cc: Santosh Shilimkar santosh.shilim...@ti.com
Cc: Felipe Balbi ba...@ti.com
Cc: Greg Kroah-Hartman gre...@linuxfoundation.org
Acked-by: Santosh Shilimkar santosh.shilim...@ti.com
Signed-off-by: WingMan Kwok w-kw...@ti.com
---
v4-v5: Moved clk_disable after removing core.
drivers/usb/dwc3/Kconfig |7 ++
drivers/usb/dwc3/Makefile|1 +
drivers/usb/dwc3/dwc3-keystone.c | 201 ++
3 files changed, 209 insertions(+)
create mode 100644 drivers/usb/dwc3/dwc3-keystone.c
diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
index 70fc430..e2c730f 100644
--- a/drivers/usb/dwc3/Kconfig
+++ b/drivers/usb/dwc3/Kconfig
@@ -70,6 +70,13 @@ config USB_DWC3_PCI
One such PCIe-based platform is Synopsys' PCIe HAPS model of
this IP.
+config USB_DWC3_KEYSTONE
+ tristate Texas Instruments Keystone2 Platforms
+ default USB_DWC3
+ help
+ Support of USB2/3 functionality in TI Keystone2 platforms.
+ Say 'Y' or 'M' here if you have one such device
+
comment Debugging features
config USB_DWC3_DEBUG
diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
index dd17601..10ac3e7 100644
--- a/drivers/usb/dwc3/Makefile
+++ b/drivers/usb/dwc3/Makefile
@@ -32,3 +32,4 @@ endif
obj-$(CONFIG_USB_DWC3_OMAP)+= dwc3-omap.o
obj-$(CONFIG_USB_DWC3_EXYNOS) += dwc3-exynos.o
obj-$(CONFIG_USB_DWC3_PCI) += dwc3-pci.o
+obj-$(CONFIG_USB_DWC3_KEYSTONE)+= dwc3-keystone.o
diff --git a/drivers/usb/dwc3/dwc3-keystone.c b/drivers/usb/dwc3/dwc3-keystone.c
new file mode 100644
index 000..e3e34eb
--- /dev/null
+++ b/drivers/usb/dwc3/dwc3-keystone.c
@@ -0,0 +1,201 @@
+/**
+ * dwc3-keystone.c - Keystone Specific Glue layer
+ *
+ * Copyright (C) 2010-2013 Texas Instruments Incorporated - http://www.ti.com
+ *
+ * Author: WingMan Kwok w-kw...@ti.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 of
+ * the License 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.
+ */
+
+#include linux/clk.h
+#include linux/module.h
+#include linux/kernel.h
+#include linux/interrupt.h
+#include linux/platform_device.h
+#include linux/dma-mapping.h
+#include linux/io.h
+#include linux/of_platform.h
+
+/* USBSS register offsets */
+#define USBSS_REVISION 0x
+#define USBSS_SYSCONFIG0x0010
+#define USBSS_IRQ_EOI 0x0018
+#define USBSS_IRQSTATUS_RAW_0 0x0020
+#define USBSS_IRQSTATUS_0 0x0024
+#define USBSS_IRQENABLE_SET_0 0x0028
+#define USBSS_IRQENABLE_CLR_0 0x002c
+
+/* IRQ register bits */
+#define USBSS_IRQ_EOI_LINE(n) BIT(n)
+#define USBSS_IRQ_EVENT_ST BIT(0)
+#define USBSS_IRQ_COREIRQ_EN BIT(0)
+#define USBSS_IRQ_COREIRQ_CLR BIT(0)
+
+static u64 kdwc3_dma_mask;
+
+struct dwc3_keystone {
+ struct device *dev;
+ struct clk *clk;
+ void __iomem*usbss;
+};
+
+static inline u32 kdwc3_readl(void __iomem *base, u32 offset)
+{
+ return readl(base + offset);
+}
+
+static inline void kdwc3_writel(void __iomem *base, u32 offset, u32 value)
+{
+ writel(value, base + offset);
+}
+
+static void kdwc3_enable_irqs(struct dwc3_keystone *kdwc)
+{
+ u32 val;
+
+ val = kdwc3_readl(kdwc-usbss, USBSS_IRQENABLE_SET_0);
+ val |= USBSS_IRQ_COREIRQ_EN;
+ kdwc3_writel(kdwc-usbss, USBSS_IRQENABLE_SET_0, val);
+}
+
+static void kdwc3_disable_irqs(struct dwc3_keystone *kdwc)
+{
+ u32 val;
+
+ val = kdwc3_readl(kdwc-usbss, USBSS_IRQENABLE_SET_0);
+ val = ~USBSS_IRQ_COREIRQ_EN;
+ kdwc3_writel(kdwc-usbss, USBSS_IRQENABLE_SET_0, val);
+}
+
+static irqreturn_t dwc3_keystone_interrupt(int irq, void *_kdwc)
+{
+ struct dwc3_keystone*kdwc = _kdwc;
+
+ kdwc3_writel(kdwc-usbss, USBSS_IRQENABLE_CLR_0, USBSS_IRQ_COREIRQ_CLR);
+ kdwc3_writel(kdwc-usbss, USBSS_IRQSTATUS_0, USBSS_IRQ_EVENT_ST);
+ kdwc3_writel(kdwc-usbss, USBSS_IRQENABLE_SET_0, USBSS_IRQ_COREIRQ_EN);
+ kdwc3_writel(kdwc-usbss, USBSS_IRQ_EOI, USBSS_IRQ_EOI_LINE(0));
+
+ return IRQ_HANDLED;
+}
+
+static int kdwc3_probe(struct platform_device *pdev)
+{
+ struct device *dev = pdev-dev;
+ struct device_node *node = pdev-dev.of_node;
+ struct dwc3_keystone*kdwc;
+ struct resource *res;
+ int error, irq;
+
+ kdwc = devm_kzalloc(dev, sizeof(*kdwc), GFP_KERNEL);
+ if (!kdwc)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, kdwc);
+
