[U-Boot] [PATCH v2 06/13] usb: dwc3: add UniPhier specific glue layer

[Masahiro Yamada]

Add UniPhier platform specific glue layer to support USB3 Host mode
on Synopsys DWC3 IP.

Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>
Reviewed-by: Marek Vasut <marex at denx.de>
---

Changes in v2:
  - Fix build error
  - Add missing PHY reset deassert

 drivers/usb/host/Kconfig         |   7 +++
 drivers/usb/host/Makefile        |   1 +
 drivers/usb/host/dwc3-uniphier.c | 119 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 127 insertions(+)
 create mode 100644 drivers/usb/host/dwc3-uniphier.c

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 89580cc..a6645dd 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -24,6 +24,13 @@ config USB_XHCI_DWC3
 	  Say Y or if your system has a Dual Role SuperSpeed
 	  USB controller based on the DesignWare USB3 IP Core.
 
+config USB_DWC3_UNIPHIER
+	bool "DesignWare USB3 Host Support on UniPhier Platforms"
+	depends on ARCH_UNIPHIER && USB_XHCI_DWC3
+	help
+	  Support of USB2/3 functionality in Socionext UniPhier platforms.
+	  Say 'Y' here if you have one such device.
+
 endif
 
 config USB_OHCI_GENERIC
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 620d114..8b54fde 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -56,6 +56,7 @@ obj-$(CONFIG_USB_EHCI_ZYNQ) += ehci-zynq.o
 # xhci
 obj-$(CONFIG_USB_XHCI_HCD) += xhci.o xhci-mem.o xhci-ring.o
 obj-$(CONFIG_USB_XHCI_DWC3) += xhci-dwc3.o
+obj-$(CONFIG_USB_DWC3_UNIPHIER) += dwc3-uniphier.o
 obj-$(CONFIG_USB_XHCI_ZYNQMP) += xhci-zynqmp.o
 obj-$(CONFIG_USB_XHCI_KEYSTONE) += xhci-keystone.o
 obj-$(CONFIG_USB_XHCI_EXYNOS) += xhci-exynos5.o
diff --git a/drivers/usb/host/dwc3-uniphier.c b/drivers/usb/host/dwc3-uniphier.c
new file mode 100644
index 0000000..e0358ac
--- /dev/null
+++ b/drivers/usb/host/dwc3-uniphier.c
@@ -0,0 +1,119 @@
+/*
+ * UniPhier Specific Glue Layer for DWC3
+ *
+ * Copyright (C) 2016 Socionext Inc.
+ *   Author: Masahiro Yamada <yamada.masahiro at socionext.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <mapmem.h>
+#include <dm/device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/sizes.h>
+
+#define UNIPHIER_PRO4_DWC3_RESET	0x40
+#define   UNIPHIER_PRO4_DWC3_RESET_XIOMMU	BIT(5)
+#define   UNIPHIER_PRO4_DWC3_RESET_XLINK	BIT(4)
+#define   UNIPHIER_PRO4_DWC3_RESET_PHY_SS	BIT(2)
+
+#define UNIPHIER_PRO5_DWC3_RESET	0x00
+#define   UNIPHIER_PRO5_DWC3_RESET_PHY_S1	BIT(17)
+#define   UNIPHIER_PRO5_DWC3_RESET_PHY_S0	BIT(16)
+#define   UNIPHIER_PRO5_DWC3_RESET_XLINK	BIT(15)
+#define   UNIPHIER_PRO5_DWC3_RESET_XIOMMU	BIT(14)
+
+#define UNIPHIER_PXS2_DWC3_RESET	0x00
+#define   UNIPHIER_PXS2_DWC3_RESET_XLINK	BIT(15)
+
+static int uniphier_pro4_dwc3_init(void __iomem *regs)
+{
+	u32 tmp;
+
+	tmp = readl(regs + UNIPHIER_PRO4_DWC3_RESET);
+	tmp &= ~UNIPHIER_PRO4_DWC3_RESET_PHY_SS;
+	tmp |= UNIPHIER_PRO4_DWC3_RESET_XIOMMU | UNIPHIER_PRO4_DWC3_RESET_XLINK;
+	writel(tmp, regs + UNIPHIER_PRO4_DWC3_RESET);
+
+	return 0;
+}
+
+static int uniphier_pro5_dwc3_init(void __iomem *regs)
+{
+	u32 tmp;
+
+	tmp = readl(regs + UNIPHIER_PRO5_DWC3_RESET);
+	tmp &= ~(UNIPHIER_PRO5_DWC3_RESET_PHY_S1 |
+		 UNIPHIER_PRO5_DWC3_RESET_PHY_S0);
+	tmp |= UNIPHIER_PRO5_DWC3_RESET_XLINK | UNIPHIER_PRO5_DWC3_RESET_XIOMMU;
+	writel(tmp, regs + UNIPHIER_PRO5_DWC3_RESET);
+
+	return 0;
+}
+
+static int uniphier_pxs2_dwc3_init(void __iomem *regs)
+{
+	u32 tmp;
+
+	tmp = readl(regs + UNIPHIER_PXS2_DWC3_RESET);
+	tmp |= UNIPHIER_PXS2_DWC3_RESET_XLINK;
+	writel(tmp, regs + UNIPHIER_PXS2_DWC3_RESET);
+
+	return 0;
+}
+
+static int uniphier_dwc3_probe(struct udevice *dev)
+{
+	fdt_addr_t base;
+	void __iomem *regs;
+	int (*init)(void __iomem *regs);
+	int ret;
+
+	base = dev_get_addr(dev);
+	if (base == FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+	regs = map_sysmem(base, SZ_32K);
+	if (!regs)
+		return -ENOMEM;
+
+	init = (int (*)(void __iomem *regs))dev_get_driver_data(dev);
+	ret = init(regs);
+	if (ret) {
+		dev_err(dev, "failed to init glue layer\n");
+		return ret;
+	}
+
+	unmap_sysmem(regs);
+
+	return 0;
+}
+
+static const struct udevice_id uniphier_dwc3_match[] = {
+	{
+		.compatible = "socionext,uniphier-pro4-dwc3",
+		.data = (ulong)uniphier_pro4_dwc3_init,
+	},
+	{
+		.compatible = "socionext,uniphier-pro5-dwc3",
+		.data = (ulong)uniphier_pro5_dwc3_init,
+	},
+	{
+		.compatible = "socionext,uniphier-pxs2-dwc3",
+		.data = (ulong)uniphier_pxs2_dwc3_init,
+	},
+	{
+		.compatible = "socionext,uniphier-ld20-dwc3",
+		.data = (ulong)uniphier_pxs2_dwc3_init,
+	},
+	{ /* sentinel */ }
+};
+
+U_BOOT_DRIVER(usb_xhci) = {
+	.name	= "uniphier-dwc3",
+	.id	= UCLASS_SIMPLE_BUS,
+	.of_match = uniphier_dwc3_match,
+	.probe = uniphier_dwc3_probe,
+};
-- 
1.9.1