[U-Boot] [PATCH v4 15/20] usb: UniPhier: add UniPhier on-chip xHCI host driver support

[Masahiro Yamada]

Support xHCI host driver used on Panasonic UniPhier platform.

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

Changes in v4:
  - use fdtdec_find_aliases_for_id() to get the offset to the node

Changes in v3: None
Changes in v2:
  - add the error check of fdtdec_get_addr()

 doc/README.uniphier              |  3 +-
 drivers/usb/host/Kconfig         |  8 ++++
 drivers/usb/host/Makefile        |  1 +
 drivers/usb/host/xhci-uniphier.c | 85 ++++++++++++++++++++++++++++++++++++++++
 include/fdtdec.h                 |  1 +
 lib/fdtdec.c                     |  1 +
 6 files changed, 98 insertions(+), 1 deletion(-)
 create mode 100644 drivers/usb/host/xhci-uniphier.c

diff --git a/doc/README.uniphier b/doc/README.uniphier
index aaeb50c..4902533 100644
--- a/doc/README.uniphier
+++ b/doc/README.uniphier
@@ -73,7 +73,8 @@ Supported devices
 
  - UART (on-chip)
  - NAND
- - USB (2.0)
+ - USB 2.0 (EHCI)
+ - USB 3.0 (xHCI)
  - LAN (on-board SMSC9118)
  - I2C
  - EEPROM (connected to the on-board I2C bus)
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 at 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);
+}
diff --git a/include/fdtdec.h b/include/fdtdec.h
index 1bc70db..1233dfb 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -168,6 +168,7 @@ enum fdt_compat_id {
 	COMPAT_AMS_AS3722,		/* AMS AS3722 PMIC */
 	COMPAT_INTEL_ICH_SPI,		/* Intel ICH7/9 SPI controller */
 	COMPAT_INTEL_QRK_MRC,		/* Intel Quark MRC */
+	COMPAT_PANASONIC_XHCI,		/* Panasonic UniPhier xHCI */
 
 	COMPAT_COUNT,
 };
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index dd58bbb..21933e4 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -76,6 +76,7 @@ static const char * const compat_names[COMPAT_COUNT] = {
 	COMPAT(AMS_AS3722, "ams,as3722"),
 	COMPAT(INTEL_ICH_SPI, "intel,ich-spi"),
 	COMPAT(INTEL_QRK_MRC, "intel,quark-mrc"),
+	COMPAT(PANASONIC_XHCI, "panasonic,uniphier-xhci"),
 };
 
 const char *fdtdec_get_compatible(enum fdt_compat_id id)
-- 
1.9.1