[U-Boot] [PATCH v4 2/4] USB: host: Add the USB3 host driver
Sherry Sun
sherry.sun at nxp.com
Mon Aug 19 06:10:44 UTC 2019
Add the USB3 host driver for NXP imx8 platform, and the
cadence IP is in it. The USB3 host driver support DM
mode, it will probe USB3 host node in dts.
Signed-off-by: Sherry Sun <sherry.sun at nxp.com>
---
drivers/usb/host/Kconfig | 9 ++
drivers/usb/host/Makefile | 1 +
drivers/usb/host/xhci-imx8.c | 209 +++++++++++++++++++++++++++++++++++
3 files changed, 219 insertions(+)
create mode 100644 drivers/usb/host/xhci-imx8.c
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index ac68aa2d27..8360ca3869 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -95,6 +95,15 @@ config USB_XHCI_FSL
depends on !SPL_NO_USB
help
Enables support for the on-chip xHCI controller on NXP Layerscape SoCs.
+
+config USB_XHCI_IMX8
+ bool "XHCI support for i.MX8"
+ depends on ARCH_IMX8
+ default y
+ help
+ Enables support for the on-chip xHCI controller on i.MX8QM and
+ i.MX8QXP SoCs.
+
endif # USB_XHCI_HCD
config USB_EHCI_HCD
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 6aa574f6f7..e5a0a4ea5a 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -55,6 +55,7 @@ obj-$(CONFIG_USB_XHCI_OMAP) += xhci-omap.o
obj-$(CONFIG_USB_XHCI_PCI) += xhci-pci.o
obj-$(CONFIG_USB_XHCI_RCAR) += xhci-rcar.o
obj-$(CONFIG_USB_XHCI_STI) += dwc3-sti-glue.o
+obj-$(CONFIG_USB_XHCI_IMX8) += xhci-imx8.o
# designware
obj-$(CONFIG_USB_DWC2) += dwc2.o
diff --git a/drivers/usb/host/xhci-imx8.c b/drivers/usb/host/xhci-imx8.c
new file mode 100644
index 0000000000..20a0196060
--- /dev/null
+++ b/drivers/usb/host/xhci-imx8.c
@@ -0,0 +1,209 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2019 NXP
+ *
+ * NXP i.MX8 USB HOST xHCI Controller (Cadence IP)
+ *
+ * Author: Peter Chen <peter.chen at nxp.com>
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <generic-phy.h>
+#include <power-domain.h>
+#include <usb.h>
+#include <wait_bit.h>
+#include <dm/device-internal.h>
+#include "xhci.h"
+
+/* Declare global data pointer */
+DECLARE_GLOBAL_DATA_PTR;
+
+/* Host registers */
+#define HCIVERSION_CAPLENGTH 0x10000
+#define USBSTS 0x10084
+
+/* None-core registers */
+#define USB3_CORE_CTRL1 0x00
+#define USB3_CORE_STATUS 0x0c
+#define USB3_SSPHY_STATUS 0x4c
+
+/* USB3_CORE_CTRL1 */
+#define ALL_SW_RESET 0xfc000000
+#define MODE_STRAP_MASK 0x7
+#define PHYAHB_SW_RESET BIT(26)
+#define OC_DISABLE BIT(9)
+#define HOST_MODE BIT(1)
+#define OTG_MODE BIT(0)
+
+/* USB3_CORE_STATUS */
+#define HOST_POWER_ON_READY BIT(12)
+
+/* USBSTS */
+#define CONTROLLER_NOT_READY BIT(11)
+
+/* USB3_SSPHY_STATUS */
+#define CLK_VLD 0xf0000000
+
+struct xhci_imx8_data {
+ void __iomem *usb3_ctrl_base;
+ void __iomem *usb3_core_base;
+ struct clk_bulk clks;
+ struct phy phy;
+};
+
+static struct xhci_imx8_data imx8_data;
+
+static int imx8_xhci_init(void)
+{
+ int ret;
+
+ writel(CLK_VLD, imx8_data.usb3_ctrl_base + USB3_SSPHY_STATUS);
+ ret = wait_for_bit_le32(imx8_data.usb3_ctrl_base + USB3_SSPHY_STATUS,
+ CLK_VLD, true, 100, false);
+ if (ret) {
+ printf("clkvld is incorrect\n");
+ return ret;
+ }
+
+ clrsetbits_le32(imx8_data.usb3_ctrl_base + USB3_CORE_CTRL1,
+ MODE_STRAP_MASK, HOST_MODE | OC_DISABLE);
+ clrbits_le32(imx8_data.usb3_ctrl_base + USB3_CORE_CTRL1,
+ PHYAHB_SW_RESET);
+ generic_phy_init(&imx8_data.phy);
+
+ /* clear all sw_rst */
+ clrbits_le32(imx8_data.usb3_ctrl_base + USB3_CORE_CTRL1, ALL_SW_RESET);
+
+ debug("wait xhci_power_on_ready\n");
+ ret = wait_for_bit_le32(imx8_data.usb3_ctrl_base + USB3_CORE_STATUS,
+ HOST_POWER_ON_READY, true, 100, false);
+ if (ret) {
+ printf("wait xhci_power_on_ready timeout\n");
+ return ret;
+ }
+ debug("xhci_power_on_ready\n");
+
+ debug("waiting CNR\n");
+ ret = wait_for_bit_le32(imx8_data.usb3_core_base + USBSTS,
+ CONTROLLER_NOT_READY, false, 100, false);
+ if (ret) {
+ printf("wait CNR timeout\n");
+ return ret;
+ }
+ debug("check CNR has finished\n");
+
+ return 0;
+}
+
+static void imx8_xhci_reset(void)
+{
+ /* Set CORE ctrl to default value, that all rst are hold */
+ writel(ALL_SW_RESET | OTG_MODE,
+ imx8_data.usb3_ctrl_base + USB3_CORE_CTRL1);
+}
+
+static int xhci_imx8_clk_init(struct udevice *dev)
+{
+ int ret;
+
+ ret = clk_get_bulk(dev, &imx8_data.clks);
+ if (ret)
+ return ret;
+
+ ret = clk_enable_bulk(&imx8_data.clks);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static void xhci_imx8_get_reg_addr(struct udevice *dev)
+{
+ imx8_data.usb3_ctrl_base =
+ (void __iomem *)devfdt_get_addr_index(dev, 0);
+ imx8_data.usb3_core_base =
+ (void __iomem *)devfdt_get_addr_index(dev, 4);
+}
+
+static int xhci_imx8_probe(struct udevice *dev)
+{
+ struct xhci_hccr *hccr;
+ struct xhci_hcor *hcor;
+ struct udevice usbotg_dev;
+ struct power_domain pd;
+ int usbotg_off;
+ int ret = 0;
+ int len;
+
+ usbotg_off = fdtdec_lookup_phandle(gd->fdt_blob,
+ dev_of_offset(dev),
+ "cdns3,usb");
+ if (usbotg_off < 0)
+ return -EINVAL;
+ usbotg_dev.node = offset_to_ofnode(usbotg_off);
+ usbotg_dev.parent = dev->parent;
+ xhci_imx8_get_reg_addr(&usbotg_dev);
+
+#if CONFIG_IS_ENABLED(POWER_DOMAIN)
+ if (!power_domain_get(&usbotg_dev, &pd)) {
+ ret = power_domain_on(&pd);
+ if (ret)
+ return ret;
+ }
+#endif
+
+ ret = generic_phy_get_by_index(&usbotg_dev, 0, &imx8_data.phy);
+ if (ret && ret != -ENOENT) {
+ printf("Failed to get USB PHY for %s\n", dev->name);
+ return ret;
+ }
+#if CONFIG_IS_ENABLED(CLK)
+ xhci_imx8_clk_init(&usbotg_dev);
+#endif
+
+ imx8_xhci_init();
+
+ hccr = (struct xhci_hccr *)(imx8_data.usb3_core_base +
+ HCIVERSION_CAPLENGTH);
+ len = HC_LENGTH(xhci_readl(&hccr->cr_capbase));
+ hcor = (struct xhci_hcor *)((uintptr_t)hccr + len);
+ printf("XHCI-imx8 init hccr 0x%p and hcor 0x%p hc_length %d\n",
+ (uint32_t *)hccr, (uint32_t *)hcor, len);
+
+ return xhci_register(dev, hccr, hcor);
+}
+
+static int xhci_imx8_remove(struct udevice *dev)
+{
+ int ret = xhci_deregister(dev);
+
+ if (!ret)
+ imx8_xhci_reset();
+
+#if CONFIG_IS_ENABLED(CLK)
+ clk_release_bulk(&imx8_data.clks);
+#endif
+ if (generic_phy_valid(&imx8_data.phy))
+ device_remove(imx8_data.phy.dev, DM_REMOVE_NORMAL);
+
+ return ret;
+}
+
+static const struct udevice_id xhci_usb_ids[] = {
+ { .compatible = "cdns,usb3-host", },
+ { }
+};
+
+U_BOOT_DRIVER(xhci_imx8) = {
+ .name = "xhci_imx8",
+ .id = UCLASS_USB,
+ .of_match = xhci_usb_ids,
+ .probe = xhci_imx8_probe,
+ .remove = xhci_imx8_remove,
+ .ops = &xhci_usb_ops,
+ .platdata_auto_alloc_size = sizeof(struct usb_platdata),
+ .priv_auto_alloc_size = sizeof(struct xhci_ctrl),
+ .flags = DM_FLAG_ALLOC_PRIV_DMA,
+};
--
2.17.1
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