usb: xhci-rockchip: add rockchip dwc3 controller driver

This patch add support for rockchip dwc3 controller, which corresponding
to the two type-C port on rk3399 evb.
Only support usb2.0 currently for we have not enable the usb3.0 phy
driver and PD(fusb302) driver.

Signed-off-by: MengDongyang <daniel.meng@rock-chips.com>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>

3 files changed, 226 insertions, 0 deletions

diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 55190bb..de25328 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_XHCI_ROCKCHIP) += xhci-rockchip.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/xhci-rockchip.c b/drivers/usb/host/xhci-rockchip.c
new file mode 100644
index 0000000..561bf86
--- /dev/null
+++ b/drivers/usb/host/xhci-rockchip.c
@@ -0,0 +1,211 @@
+/*
+ * Copyright (c) 2016 Rockchip, Inc.
+ * Authors: Daniel Meng <daniel.meng@rock-chips.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <common.h>
+#include <dm.h>
+#include <fdtdec.h>
+#include <libfdt.h>
+#include <malloc.h>
+#include <usb.h>
+#include <watchdog.h>
+#include <asm/gpio.h>
+#include <asm-generic/errno.h>
+#include <linux/compat.h>
+#include <linux/usb/dwc3.h>
+
+#include "xhci.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct rockchip_xhci_platdata {
+	fdt_addr_t hcd_base;
+	fdt_addr_t phy_base;
+	struct gpio_desc vbus_gpio;
+};
+
+/*
+ * Contains pointers to register base addresses
+ * for the usb controller.
+ */
+struct rockchip_xhci {
+	struct usb_platdata usb_plat;
+	struct xhci_ctrl ctrl;
+	struct xhci_hccr *hcd;
+	struct dwc3 *dwc3_reg;
+};
+
+static int xhci_usb_ofdata_to_platdata(struct udevice *dev)
+{
+	struct rockchip_xhci_platdata *plat = dev_get_platdata(dev);
+	struct udevice *child;
+	int ret = 0;
+
+	/*
+	 * Get the base address for XHCI controller from the device node
+	 */
+	plat->hcd_base = dev_get_addr(dev);
+	if (plat->hcd_base == FDT_ADDR_T_NONE) {
+		debug("Can't get the XHCI register base address\n");
+		return -ENXIO;
+	}
+
+	/* Get the base address for usbphy from the device node */
+	for (device_find_first_child(dev, &child); child;
+	     device_find_next_child(&child)) {
+		if (!of_device_is_compatible(child, "rockchip,rk3399-usb3-phy"))
+			continue;
+		plat->phy_base = dev_get_addr(child);
+		break;
+	}
+
+	if (plat->phy_base == FDT_ADDR_T_NONE) {
+		debug("Can't get the usbphy register address\n");
+		return -ENXIO;
+	}
+
+	/* Vbus gpio */
+	ret = gpio_request_by_name(dev, "rockchip,vbus-gpio", 0,
+				   &plat->vbus_gpio, GPIOD_IS_OUT);
+	if (ret)
+		debug("rockchip,vbus-gpio node missing!");
+
+	return 0;
+}
+
+/*
+ * rockchip_dwc3_phy_setup() - Configure USB PHY Interface of DWC3 Core
+ * @dwc: Pointer to our controller context structure
+ * @dev: Pointer to ulcass device
+ */
+static void rockchip_dwc3_phy_setup(struct dwc3 *dwc3_reg,
+				    struct udevice *dev)
+{
+	u32 reg;
+	const void *blob = gd->fdt_blob;
+	u32 utmi_bits;
+
+	/* Set dwc3 usb2 phy config */
+	reg = readl(&dwc3_reg->g_usb2phycfg[0]);
+
+	if (fdtdec_get_bool(blob, dev->of_offset,
+			    "snps,dis-enblslpm-quirk"))
+		reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM;
+
+	utmi_bits = fdtdec_get_int(blob, dev->of_offset,
+				   "snps,phyif-utmi-bits", -1);
+	if (utmi_bits == 16) {
+		reg |= DWC3_GUSB2PHYCFG_PHYIF;
+		reg &= ~DWC3_GUSB2PHYCFG_USBTRDTIM_MASK;
+		reg |= DWC3_GUSB2PHYCFG_USBTRDTIM_16BIT;
+	} else if (utmi_bits == 8) {
+		reg &= ~DWC3_GUSB2PHYCFG_PHYIF;
+		reg &= ~DWC3_GUSB2PHYCFG_USBTRDTIM_MASK;
+		reg |= DWC3_GUSB2PHYCFG_USBTRDTIM_8BIT;
+	}
+
+	if (fdtdec_get_bool(blob, dev->of_offset,
+			    "snps,dis-u2-freeclk-exists-quirk"))
+		reg &= ~DWC3_GUSB2PHYCFG_U2_FREECLK_EXISTS;
+
+	if (fdtdec_get_bool(blob, dev->of_offset,
+			    "snps,dis-u2-susphy-quirk"))
+		reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
+
+	writel(reg, &dwc3_reg->g_usb2phycfg[0]);
+}
+
+static int rockchip_xhci_core_init(struct rockchip_xhci *rkxhci,
+				   struct udevice *dev)
+{
+	int ret;
+
+	ret = dwc3_core_init(rkxhci->dwc3_reg);
+	if (ret) {
+		debug("failed to initialize core\n");
+		return ret;
+	}
+
+	rockchip_dwc3_phy_setup(rkxhci->dwc3_reg, dev);
+
+	/* We are hard-coding DWC3 core to Host Mode */
+	dwc3_set_mode(rkxhci->dwc3_reg, DWC3_GCTL_PRTCAP_HOST);
+
+	return 0;
+}
+
+static int rockchip_xhci_core_exit(struct rockchip_xhci *rkxhci)
+{
+	return 0;
+}
+
+static int xhci_usb_probe(struct udevice *dev)
+{
+	struct rockchip_xhci_platdata *plat = dev_get_platdata(dev);
+	struct rockchip_xhci *ctx = dev_get_priv(dev);
+	struct xhci_hcor *hcor;
+	int ret;
+
+	ctx->hcd = (struct xhci_hccr *)plat->hcd_base;
+	ctx->dwc3_reg = (struct dwc3 *)((char *)(ctx->hcd) + DWC3_REG_OFFSET);
+	hcor = (struct xhci_hcor *)((uint64_t)ctx->hcd +
+			HC_LENGTH(xhci_readl(&ctx->hcd->cr_capbase)));
+
+	/* setup the Vbus gpio here */
+	if (dm_gpio_is_valid(&plat->vbus_gpio))
+		dm_gpio_set_value(&plat->vbus_gpio, 1);
+
+	ret = rockchip_xhci_core_init(ctx, dev);
+	if (ret) {
+		debug("XHCI: failed to initialize controller\n");
+		return ret;
+	}
+
+	return xhci_register(dev, ctx->hcd, hcor);
+}
+
+static int xhci_usb_remove(struct udevice *dev)
+{
+	struct rockchip_xhci *ctx = dev_get_priv(dev);
+	int ret;
+
+	ret = xhci_deregister(dev);
+	if (ret)
+		return ret;
+	ret = rockchip_xhci_core_exit(ctx);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static const struct udevice_id xhci_usb_ids[] = {
+	{ .compatible = "rockchip,rk3399-xhci" },
+	{ }
+};
+
+U_BOOT_DRIVER(usb_xhci) = {
+	.name	= "xhci_rockchip",
+	.id	= UCLASS_USB,
+	.of_match = xhci_usb_ids,
+	.ofdata_to_platdata = xhci_usb_ofdata_to_platdata,
+	.probe = xhci_usb_probe,
+	.remove = xhci_usb_remove,
+	.ops	= &xhci_usb_ops,
+	.bind	= dm_scan_fdt_dev,
+	.platdata_auto_alloc_size = sizeof(struct rockchip_xhci_platdata),
+	.priv_auto_alloc_size = sizeof(struct rockchip_xhci),
+	.flags	= DM_FLAG_ALLOC_PRIV_DMA,
+};
+
+static const struct udevice_id usb_phy_ids[] = {
+	{ .compatible = "rockchip,rk3399-usb3-phy" },
+	{ }
+};
+
+U_BOOT_DRIVER(usb_phy) = {
+	.name = "usb_phy_rockchip",
+	.of_match = usb_phy_ids,
+};
diff --git a/include/linux/usb/dwc3.h b/include/linux/usb/dwc3.h
index 6d1e365..a027446 100644
--- a/include/linux/usb/dwc3.h
+++ b/include/linux/usb/dwc3.h
@@ -180,7 +180,21 @@ struct dwc3 {					/* offset: 0xC100 */
 
 /* Global USB2 PHY Configuration Register */
 #define DWC3_GUSB2PHYCFG_PHYSOFTRST		(1 << 31)
+#define DWC3_GUSB2PHYCFG_U2_FREECLK_EXISTS	(1 << 30)
+#define DWC3_GUSB2PHYCFG_ENBLSLPM		(1 << 8)
 #define DWC3_GUSB2PHYCFG_SUSPHY			(1 << 6)
+#define DWC3_GUSB2PHYCFG_PHYIF			(1 << 3)
+
+/* Global USB2 PHY Configuration Mask */
+#define DWC3_GUSB2PHYCFG_USBTRDTIM_MASK		(0xf << 10)
+
+/* Global USB2 PHY Configuration Offset */
+#define DWC3_GUSB2PHYCFG_USBTRDTIM_OFFSET	10
+
+#define DWC3_GUSB2PHYCFG_USBTRDTIM_16BIT (0x5 << \
+		DWC3_GUSB2PHYCFG_USBTRDTIM_OFFSET)
+#define DWC3_GUSB2PHYCFG_USBTRDTIM_8BIT (0x9 << \
+		DWC3_GUSB2PHYCFG_USBTRDTIM_OFFSET)
 
 /* Global USB3 PIPE Control Register */
 #define DWC3_GUSB3PIPECTL_PHYSOFTRST		(1 << 31)