usb: UniPhier: add UniPhier on-chip xHCI host driver support

Support xHCI host driver used on Panasonic UniPhier platform.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Acked-by: Marek Vasut <marex@denx.de>

3 files changed, 94 insertions, 0 deletions

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 0e005c2..24a595f 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -17,6 +17,14 @@ config USB_XHCI
 
 if USB_XHCI_HCD
 
+config USB_XHCI_UNIPHIER
+	bool "Support for Panasonic UniPhier on-chip xHCI USB controller"
+	depends on ARCH_UNIPHIER
+	default y
+	---help---
+	  Enables support for the on-chip xHCI controller on Panasonic
+	  UniPhier SoCs.
+
 endif
 
 config USB_EHCI_HCD
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 66d6e9a..eb6f34b 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -48,6 +48,7 @@ obj-$(CONFIG_USB_XHCI_KEYSTONE) += xhci-keystone.o
 obj-$(CONFIG_USB_XHCI_EXYNOS) += xhci-exynos5.o
 obj-$(CONFIG_USB_XHCI_OMAP) += xhci-omap.o
 obj-$(CONFIG_USB_XHCI_PCI) += xhci-pci.o
+obj-$(CONFIG_USB_XHCI_UNIPHIER) += xhci-uniphier.o
 
 # designware
 obj-$(CONFIG_USB_DWC2) += dwc2.o
diff --git a/drivers/usb/host/xhci-uniphier.c b/drivers/usb/host/xhci-uniphier.c
new file mode 100644
index 0000000..08b15e0
--- /dev/null
+++ b/drivers/usb/host/xhci-uniphier.c
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2015 Panasonic Corporation
+ *   Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <linux/err.h>
+#include <usb.h>
+#include <fdtdec.h>
+#include "xhci.h"
+
+static int get_uniphier_xhci_base(int index, struct xhci_hccr **base)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+	int node_list[2];
+	fdt_addr_t addr;
+	int count;
+
+	count = fdtdec_find_aliases_for_id(gd->fdt_blob, "usb",
+					   COMPAT_PANASONIC_XHCI, node_list,
+					   ARRAY_SIZE(node_list));
+
+	if (index >= count)
+		return -ENODEV;
+
+	addr = fdtdec_get_addr(gd->fdt_blob, node_list[index], "reg");
+	if (addr == FDT_ADDR_T_NONE)
+		return -ENODEV;
+
+	*base = (struct xhci_hccr *)addr;
+
+	return 0;
+}
+
+#define USB3_RST_CTRL		0x00100040
+#define IOMMU_RST_N		(1 << 5)
+#define LINK_RST_N		(1 << 4)
+
+static void uniphier_xhci_reset(void __iomem *base, int on)
+{
+	u32 tmp;
+
+	tmp = readl(base + USB3_RST_CTRL);
+
+	if (on)
+		tmp &= ~(IOMMU_RST_N | LINK_RST_N);
+	else
+		tmp |= IOMMU_RST_N | LINK_RST_N;
+
+	writel(tmp, base + USB3_RST_CTRL);
+}
+
+int xhci_hcd_init(int index, struct xhci_hccr **hccr, struct xhci_hcor **hcor)
+{
+	int ret;
+	struct xhci_hccr *cr;
+	struct xhci_hcor *or;
+
+	ret = get_uniphier_xhci_base(index, &cr);
+	if (ret < 0)
+		return ret;
+
+	uniphier_xhci_reset(cr, 0);
+
+	or = (void *)cr + HC_LENGTH(xhci_readl(&cr->cr_capbase));
+
+	*hccr = cr;
+	*hcor = or;
+
+	return 0;
+}
+
+void xhci_hcd_stop(int index)
+{
+	int ret;
+	struct xhci_hccr *cr;
+
+	ret = get_uniphier_xhci_base(index, &cr);
+	if (ret < 0)
+		return;
+
+	uniphier_xhci_reset(cr, 1);
+}