Registers DWC3's ULPI interface with the ULPI bus when it's available. Signed-off-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx> Acked-by: David Cohen <david.a.cohen@xxxxxxxxxxxxxxx> --- drivers/usb/dwc3/Kconfig | 7 ++++ drivers/usb/dwc3/Makefile | 4 +++ drivers/usb/dwc3/core.c | 34 ++++++++++++++++-- drivers/usb/dwc3/core.h | 14 ++++++++ drivers/usb/dwc3/ulpi.c | 91 +++++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 147 insertions(+), 3 deletions(-) create mode 100644 drivers/usb/dwc3/ulpi.c diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig index 827c4f8..6f92b36 100644 --- a/drivers/usb/dwc3/Kconfig +++ b/drivers/usb/dwc3/Kconfig @@ -11,6 +11,13 @@ config USB_DWC3 if USB_DWC3 +config USB_DWC3_ULPI + bool "Register ULPI PHY Interface" + depends on USB_ULPI_BUS + help + Select this if you have ULPI type PHY attached to your DWC3 + controller. + choice bool "DWC3 Mode Selection" default USB_DWC3_DUAL_ROLE if (USB && USB_GADGET) diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile index 46172f4..c7076e3 100644 --- a/drivers/usb/dwc3/Makefile +++ b/drivers/usb/dwc3/Makefile @@ -15,6 +15,10 @@ ifneq ($(filter y,$(CONFIG_USB_DWC3_GADGET) $(CONFIG_USB_DWC3_DUAL_ROLE)),) dwc3-y += gadget.o ep0.o endif +ifneq ($(CONFIG_USB_DWC3_ULPI),) + dwc3-y += ulpi.o +endif + ifneq ($(CONFIG_DEBUG_FS),) dwc3-y += debugfs.o endif diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 0de8968..5c110d8 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -394,10 +394,15 @@ static void dwc3_cache_hwparams(struct dwc3 *dwc) /** * dwc3_phy_setup - Configure USB PHY Interface of DWC3 Core * @dwc: Pointer to our controller context structure + * + * Returns 0 on success. The USB PHY interfaces are configured but not + * initialized. The PHY interfaces and the PHYs get initialized together with + * the core in dwc3_core_init. */ -static void dwc3_phy_setup(struct dwc3 *dwc) +static int dwc3_phy_setup(struct dwc3 *dwc) { u32 reg; + int ret; reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0)); @@ -443,13 +448,30 @@ static void dwc3_phy_setup(struct dwc3 *dwc) case DWC3_GHWPARAMS3_HSPHY_IFC_UTMI_ULPI: if (!strncmp(dwc->hsphy_interface, "utmi", 4)) { reg &= ~DWC3_GUSB2PHYCFG_ULPI_UTMI; + break; } else if (!strncmp(dwc->hsphy_interface, "ulpi", 4)) { reg |= DWC3_GUSB2PHYCFG_ULPI_UTMI; + dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg); } else { dev_warn(dwc->dev, "HSPHY Interface not defined\n"); - break; + + /* Relying on default value. */ + if (!(reg & DWC3_GUSB2PHYCFG_ULPI_UTMI)) + break; } /* FALLTHROUGH */ + case DWC3_GHWPARAMS3_HSPHY_IFC_ULPI: + /* Making sure the interface and PHY are operational */ + ret = dwc3_soft_reset(dwc); + if (ret) + return ret; + + udelay(1); + + ret = dwc3_ulpi_init(dwc); + if (ret) + return ret; + /* FALLTHROUGH */ default: break; } @@ -467,6 +489,8 @@ static void dwc3_phy_setup(struct dwc3 *dwc) reg &= ~DWC3_GUSB2PHYCFG_SUSPHY; dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg); + + return 0; } /** @@ -906,7 +930,9 @@ static int dwc3_probe(struct platform_device *pdev) platform_set_drvdata(pdev, dwc); dwc3_cache_hwparams(dwc); - dwc3_phy_setup(dwc); + ret = dwc3_phy_setup(dwc); + if (ret) + goto err0; ret = dwc3_core_get_phy(dwc); if (ret) @@ -994,6 +1020,7 @@ err2: err1: dwc3_free_event_buffers(dwc); + dwc3_ulpi_exit(dwc); err0: /* @@ -1029,6 +1056,7 @@ static int dwc3_remove(struct platform_device *pdev) phy_power_off(dwc->usb3_generic_phy); dwc3_core_exit(dwc); + dwc3_ulpi_exit(dwc); pm_runtime_put_sync(&pdev->dev); pm_runtime_disable(&pdev->dev); diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index 7b3ab64..d70da20 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -30,6 +30,7 @@ #include <linux/usb/ch9.h> #include <linux/usb/gadget.h> #include <linux/usb/otg.h> +#include <linux/ulpi/interface.h> #include <linux/phy/phy.h> @@ -661,6 +662,7 @@ struct dwc3_scratchpad_array { * @usb3_phy: pointer to USB3 PHY * @usb2_generic_phy: pointer to USB2 PHY * @usb3_generic_phy: pointer to USB3 PHY + * @ulpi: pointer to ulpi interface * @dcfg: saved contents of DCFG register * @gctl: saved contents of GCTL register * @isoch_delay: wValue from Set Isochronous Delay request; @@ -749,6 +751,8 @@ struct dwc3 { struct phy *usb2_generic_phy; struct phy *usb3_generic_phy; + struct ulpi *ulpi; + void __iomem *regs; size_t regs_size; @@ -1047,4 +1051,14 @@ static inline int dwc3_gadget_resume(struct dwc3 *dwc) } #endif /* !IS_ENABLED(CONFIG_USB_DWC3_HOST) */ +#if IS_ENABLED(CONFIG_USB_DWC3_ULPI) +int dwc3_ulpi_init(struct dwc3 *dwc); +void dwc3_ulpi_exit(struct dwc3 *dwc); +#else +static inline int dwc3_ulpi_init(struct dwc3 *dwc) +{ return 0; } +static inline void dwc3_ulpi_exit(struct dwc3 *dwc) +{ } +#endif + #endif /* __DRIVERS_USB_DWC3_CORE_H */ diff --git a/drivers/usb/dwc3/ulpi.c b/drivers/usb/dwc3/ulpi.c new file mode 100644 index 0000000..ec004c6 --- /dev/null +++ b/drivers/usb/dwc3/ulpi.c @@ -0,0 +1,91 @@ +/** + * ulpi.c - DesignWare USB3 Controller's ULPI PHY interface + * + * Copyright (C) 2015 Intel Corporation + * + * Author: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/ulpi/regs.h> + +#include "core.h" +#include "io.h" + +#define DWC3_ULPI_ADDR(a) \ + ((a >= ULPI_EXT_VENDOR_SPECIFIC) ? \ + DWC3_GUSB2PHYACC_ADDR(ULPI_ACCESS_EXTENDED) | \ + DWC3_GUSB2PHYACC_EXTEND_ADDR(a) : DWC3_GUSB2PHYACC_ADDR(a)) + +static int dwc3_ulpi_busyloop(struct dwc3 *dwc) +{ + unsigned count = 1000; + u32 reg; + + while (count--) { + reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYACC(0)); + if (!(reg & DWC3_GUSB2PHYACC_BUSY)) + return 0; + cpu_relax(); + } + + return -ETIMEDOUT; +} + +static int dwc3_ulpi_read(struct ulpi_ops *ops, u8 addr) +{ + struct dwc3 *dwc = dev_get_drvdata(ops->dev); + u32 reg; + int ret; + + reg = DWC3_GUSB2PHYACC_NEWREGREQ | DWC3_ULPI_ADDR(addr); + dwc3_writel(dwc->regs, DWC3_GUSB2PHYACC(0), reg); + + ret = dwc3_ulpi_busyloop(dwc); + if (ret) + return ret; + + reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYACC(0)); + + return DWC3_GUSB2PHYACC_DATA(reg); +} + +static int dwc3_ulpi_write(struct ulpi_ops *ops, u8 addr, u8 val) +{ + struct dwc3 *dwc = dev_get_drvdata(ops->dev); + u32 reg; + + reg = DWC3_GUSB2PHYACC_NEWREGREQ | DWC3_ULPI_ADDR(addr); + reg |= DWC3_GUSB2PHYACC_WRITE | val; + dwc3_writel(dwc->regs, DWC3_GUSB2PHYACC(0), reg); + + return dwc3_ulpi_busyloop(dwc); +} + +static struct ulpi_ops dwc3_ulpi_ops = { + .read = dwc3_ulpi_read, + .write = dwc3_ulpi_write, +}; + +int dwc3_ulpi_init(struct dwc3 *dwc) +{ + /* Register the interface */ + dwc->ulpi = ulpi_register_interface(dwc->dev, &dwc3_ulpi_ops); + if (IS_ERR(dwc->ulpi)) { + dev_err(dwc->dev, "failed to register ULPI interface"); + return PTR_ERR(dwc->ulpi); + } + + return 0; +} + +void dwc3_ulpi_exit(struct dwc3 *dwc) +{ + if (dwc->ulpi) { + ulpi_unregister_interface(dwc->ulpi); + dwc->ulpi = NULL; + } +} -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html