Merge commit '60b30c036397cb5627fa374bb930794b225daa29' as 'lib/lufa'

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diff --git a/lib/lufa/LUFA/Platform/UC3/ClockManagement.h b/lib/lufa/LUFA/Platform/UC3/ClockManagement.h
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+/*
+             LUFA Library
+     Copyright (C) Dean Camera, 2017.
+
+  dean [at] fourwalledcubicle [dot] com
+           www.lufa-lib.org
+*/
+
+/*
+  Copyright 2017  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+  Permission to use, copy, modify, distribute, and sell this
+  software and its documentation for any purpose is hereby granted
+  without fee, provided that the above copyright notice appear in
+  all copies and that both that the copyright notice and this
+  permission notice and warranty disclaimer appear in supporting
+  documentation, and that the name of the author not be used in
+  advertising or publicity pertaining to distribution of the
+  software without specific, written prior permission.
+
+  The author disclaims all warranties with regard to this
+  software, including all implied warranties of merchantability
+  and fitness.  In no event shall the author be liable for any
+  special, indirect or consequential damages or any damages
+  whatsoever resulting from loss of use, data or profits, whether
+  in an action of contract, negligence or other tortious action,
+  arising out of or in connection with the use or performance of
+  this software.
+*/
+
+/** \file
+ *  \brief Module Clock Driver for the AVR32 UC3 microcontrollers.
+ *
+ *  Clock management driver for the AVR32 UC3 microcontrollers. This driver allows for the configuration
+ *  of the various clocks within the device to clock the various peripherals.
+ */
+
+/** \ingroup Group_PlatformDrivers_UC3
+ *  \defgroup Group_PlatformDrivers_UC3Clocks Clock Management Driver - LUFA/Platform/UC3/ClockManagement.h
+ *  \brief Module Clock Driver for the AVR32 UC3 microcontrollers.
+ *
+ *  \section Sec_PlatformDrivers_UC3Clocks_Dependencies Module Source Dependencies
+ *  The following files must be built with any user project that uses this module:
+ *    - None
+ *
+ *  \section Sec_PlatformDrivers_UC3Clocks_ModDescription Module Description
+ *  Clock management driver for the AVR32 UC3 microcontrollers. This driver allows for the configuration
+ *  of the various clocks within the device to clock the various peripherals.
+ *
+ *  Usage Example:
+ *  \code
+ *		#include <LUFA/Platform/UC3/ClockManagement.h>
+ *
+ *		void main(void)
+ *		{
+ *			// Start the master external oscillator which will be used as the main clock reference
+ *			UC3CLK_StartExternalOscillator(0, EXOSC_MODE_8MHZ_OR_MORE, EXOSC_START_0CLK);
+ *
+ *			// Start the PLL for the CPU clock, switch CPU to it
+ *			UC3CLK_StartPLL(0, CLOCK_SRC_OSC0, 12000000, F_CPU);
+ *			UC3CLK_SetCPUClockSource(CLOCK_SRC_PLL0, F_CPU);
+ *
+ *			// Start the PLL for the USB Generic Clock module
+ *			UC3CLK_StartPLL(1, CLOCK_SRC_OSC0, 12000000, 48000000);
+ *		}
+ *  \endcode
+ *
+ *  @{
+ */
+
+#ifndef _UC3_CLOCK_MANAGEMENT_H_
+#define _UC3_CLOCK_MANAGEMENT_H_
+
+	/* Includes: */
+		#include "../../Common/Common.h"
+
+	/* Enable C linkage for C++ Compilers: */
+		#if defined(__cplusplus)
+			extern "C" {
+		#endif
+
+	/* Public Interface - May be used in end-application: */
+		/* Macros: */
+			/** Enum for the possible external oscillator types. */
+			enum UC3_Extern_OSC_ClockTypes_t
+			{
+				EXOSC_MODE_CLOCK         = AVR32_PM_OSCCTRL0_MODE_EXT_CLOCK,  /**< External clock (non-crystal) mode. */
+				EXOSC_MODE_900KHZ_MAX    = AVR32_PM_OSCCTRL0_MODE_CRYSTAL_G0, /**< External crystal oscillator equal to or slower than 900KHz. */
+				EXOSC_MODE_3MHZ_MAX      = AVR32_PM_OSCCTRL0_MODE_CRYSTAL_G1, /**< External crystal oscillator equal to or slower than 3MHz. */
+				EXOSC_MODE_8MHZ_MAX      = AVR32_PM_OSCCTRL0_MODE_CRYSTAL_G2, /**< External crystal oscillator equal to or slower than 8MHz. */
+				EXOSC_MODE_8MHZ_OR_MORE  = AVR32_PM_OSCCTRL0_MODE_CRYSTAL_G3, /**< External crystal oscillator equal to or faster than 8MHz. */
+			};
+
+			/** Enum for the possible external oscillator startup times. */
+			enum UC3_Extern_OSC_ClockStartup_t
+			{
+				EXOSC_START_0CLK         = AVR32_PM_OSCCTRL0_STARTUP_0_RCOSC,     /**< Immediate startup, no delay. */
+				EXOSC_START_64CLK        = AVR32_PM_OSCCTRL0_STARTUP_64_RCOSC,    /**< Wait 64 clock cycles before startup for stability. */
+				EXOSC_START_128CLK       = AVR32_PM_OSCCTRL0_STARTUP_128_RCOSC,   /**< Wait 128 clock cycles before startup for stability. */
+				EXOSC_START_2048CLK      = AVR32_PM_OSCCTRL0_STARTUP_2048_RCOSC,  /**< Wait 2048 clock cycles before startup for stability. */
+				EXOSC_START_4096CLK      = AVR32_PM_OSCCTRL0_STARTUP_4096_RCOSC,  /**< Wait 4096 clock cycles before startup for stability. */
+				EXOSC_START_8192CLK      = AVR32_PM_OSCCTRL0_STARTUP_8192_RCOSC,  /**< Wait 8192 clock cycles before startup for stability. */
+				EXOSC_START_16384CLK     = AVR32_PM_OSCCTRL0_STARTUP_16384_RCOSC, /**< Wait 16384 clock cycles before startup for stability. */
+			};
+
+			/** Enum for the possible module clock sources. */
+			enum UC3_System_ClockSource_t
+			{
+				CLOCK_SRC_SLOW_CLK       = 0, /**< Clock sourced from the internal slow clock. */
+				CLOCK_SRC_OSC0           = 1, /**< Clock sourced from the Oscillator 0 clock. */
+				CLOCK_SRC_OSC1           = 2, /**< Clock sourced from the Oscillator 1 clock. */
+				CLOCK_SRC_PLL0           = 3, /**< Clock sourced from the PLL 0 clock. */
+				CLOCK_SRC_PLL1           = 4, /**< Clock sourced from the PLL 1 clock. */
+			};
+
+		/* Inline Functions: */
+			/** Starts the given external oscillator of the UC3 microcontroller, with the given options. This routine blocks until
+			 *  the oscillator is ready for use.
+			 *
+			 *  \param[in] Channel  Index of the external oscillator to start.
+			 *  \param[in] Type     Type of clock attached to the given oscillator channel, a value from \ref UC3_Extern_OSC_ClockTypes_t.
+			 *  \param[in] Startup  Startup time of the external oscillator, a value from \ref UC3_Extern_OSC_ClockStartup_t.
+			 *
+			 *  \return Boolean \c true if the external oscillator was successfully started, \c false if invalid parameters specified.
+			 */
+			static inline bool UC3CLK_StartExternalOscillator(const uint8_t Channel,
+			                                                  const uint8_t Type,
+			                                                  const uint8_t Startup) ATTR_ALWAYS_INLINE;
+			static inline bool UC3CLK_StartExternalOscillator(const uint8_t Channel,
+			                                                  const uint8_t Type,
+			                                                  const uint8_t Startup)
+			{
+				switch (Channel)
+				{
+					case 0:
+						AVR32_PM.OSCCTRL0.startup = Startup;
+						AVR32_PM.OSCCTRL0.mode    = Type;
+						break;
+					case 1:
+						AVR32_PM.OSCCTRL1.startup = Startup;
+						AVR32_PM.OSCCTRL1.mode    = Type;
+						break;
+					default:
+						return false;
+				}
+
+				AVR32_PM.mcctrl |= (1 << (AVR32_PM_MCCTRL_OSC0EN_OFFSET + Channel));
+
+				while (!(AVR32_PM.poscsr & (1 << (AVR32_PM_POSCSR_OSC0RDY_OFFSET + Channel))));
+				return true;
+			}
+
+			/** Stops the given external oscillator of the UC3 microcontroller.
+			 *
+			 *  \param[in] Channel  Index of the external oscillator to stop.
+			 */
+			static inline void UC3CLK_StopExternalOscillator(const uint8_t Channel) ATTR_ALWAYS_INLINE;
+			static inline void UC3CLK_StopExternalOscillator(const uint8_t Channel)
+			{
+				AVR32_PM.mcctrl &= ~(1 << (AVR32_PM_MCCTRL_OSC0EN_OFFSET + Channel));
+			}
+
+			/** Starts the given PLL of the UC3 microcontroller, with the given options. This routine blocks until the PLL is ready for use.
+			 *
+			 *  \attention The output frequency must be equal to or greater than the source frequency.
+			 *
+			 *  \param[in] Channel     Index of the PLL to start.
+			 *  \param[in] Source      Clock source for the PLL, a value from \ref UC3_System_ClockSource_t.
+			 *  \param[in] SourceFreq  Frequency of the PLL's clock source, in Hz.
+			 *  \param[in] Frequency   Target frequency of the PLL's output.
+			 *
+			 *  \return Boolean \c true if the PLL was successfully started, \c false if invalid parameters specified.
+			 */
+			static inline bool UC3CLK_StartPLL(const uint8_t Channel,
+			                                   const uint8_t Source,
+			                                   const uint32_t SourceFreq,
+			                                   const uint32_t Frequency) ATTR_ALWAYS_INLINE;
+			static inline bool UC3CLK_StartPLL(const uint8_t Channel,
+			                                   const uint8_t Source,
+			                                   const uint32_t SourceFreq,
+			                                   const uint32_t Frequency)
+			{
+				if (SourceFreq > Frequency)
+				  return false;
+
+				switch (Source)
+				{
+					case CLOCK_SRC_OSC0:
+						AVR32_PM.PLL[Channel].pllosc = 0;
+						break;
+					case CLOCK_SRC_OSC1:
+						AVR32_PM.PLL[Channel].pllosc = 1;
+						break;
+					default:
+						return false;
+				}
+
+				AVR32_PM.PLL[Channel].pllmul = (Frequency / SourceFreq) ? (((Frequency / SourceFreq) - 1) / 2) : 0;
+				AVR32_PM.PLL[Channel].plldiv = 0;
+				AVR32_PM.PLL[Channel].pllen  = true;
+
+				while (!(AVR32_PM.poscsr & (1 << (AVR32_PM_POSCSR_LOCK0_OFFSET + Channel))));
+				return true;
+			}
+
+			/** Stops the given PLL of the UC3 microcontroller.
+			 *
+			 *  \param[in] Channel  Index of the PLL to stop.
+			 */
+			static inline void UC3CLK_StopPLL(const uint8_t Channel) ATTR_ALWAYS_INLINE;
+			static inline void UC3CLK_StopPLL(const uint8_t Channel)
+			{
+				AVR32_PM.PLL[Channel].pllen = false;
+			}
+
+			/** Starts the given Generic Clock of the UC3 microcontroller, with the given options.
+			 *
+			 *  \param[in] Channel     Index of the Generic Clock to start.
+			 *  \param[in] Source      Clock source for the Generic Clock, a value from \ref UC3_System_ClockSource_t.
+			 *  \param[in] SourceFreq  Frequency of the Generic Clock's clock source, in Hz.
+			 *  \param[in] Frequency   Target frequency of the Generic Clock's output.
+			 *
+			 *  \return Boolean \c true if the Generic Clock was successfully started, \c false if invalid parameters specified.
+			 */
+			static inline bool UC3CLK_StartGenericClock(const uint8_t Channel,
+			                                            const uint8_t Source,
+			                                            const uint32_t SourceFreq,
+			                                            const uint32_t Frequency) ATTR_ALWAYS_INLINE;
+			static inline bool UC3CLK_StartGenericClock(const uint8_t Channel,
+			                                            const uint8_t Source,
+			                                            const uint32_t SourceFreq,
+			                                            const uint32_t Frequency)
+			{
+				if (Channel >= AVR32_PM_GCLK_NUM)
+				  return false;
+
+				if (SourceFreq < Frequency)
+				  return false;
+
+				switch (Source)
+				{
+					case CLOCK_SRC_OSC0:
+						AVR32_PM.GCCTRL[Channel].pllsel = false;
+						AVR32_PM.GCCTRL[Channel].oscsel = 0;
+						break;
+					case CLOCK_SRC_OSC1:
+						AVR32_PM.GCCTRL[Channel].pllsel = false;
+						AVR32_PM.GCCTRL[Channel].oscsel = 1;
+						break;
+					case CLOCK_SRC_PLL0:
+						AVR32_PM.GCCTRL[Channel].pllsel = true;
+						AVR32_PM.GCCTRL[Channel].oscsel = 0;
+						break;
+					case CLOCK_SRC_PLL1:
+						AVR32_PM.GCCTRL[Channel].pllsel = true;
+						AVR32_PM.GCCTRL[Channel].oscsel = 1;
+						break;
+					default:
+						return false;
+				}
+
+				AVR32_PM.GCCTRL[Channel].diven = (SourceFreq > Frequency) ? true : false;
+				AVR32_PM.GCCTRL[Channel].div   = (((SourceFreq / Frequency) - 1) / 2);
+				AVR32_PM.GCCTRL[Channel].cen   = true;
+
+				return true;
+			}
+
+			/** Stops the given generic clock of the UC3 microcontroller.
+			 *
+			 *  \param[in] Channel  Index of the generic clock to stop.
+			 *
+			 *  \return Boolean \c true if the generic clock was successfully stopped, \c false if invalid parameters specified.
+			 */
+			static inline bool UC3CLK_StopGenericClock(const uint8_t Channel) ATTR_ALWAYS_INLINE;
+			static inline bool UC3CLK_StopGenericClock(const uint8_t Channel)
+			{
+				if (Channel >= AVR32_PM_GCLK_NUM)
+				  return false;
+
+				AVR32_PM.GCCTRL[Channel].cen = false;
+
+				return true;
+			}
+
+			/** Sets the clock source for the main microcontroller core. The given clock source should be configured
+			 *  and ready for use before this function is called.
+			 *
+			 *  This function will configure the FLASH controller's wait states automatically to suit the given clock source.
+			 *
+			 *  \param[in] Source      Clock source for the CPU core, a value from \ref UC3_System_ClockSource_t.
+			 *  \param[in] SourceFreq  Frequency of the CPU core's clock source, in Hz.
+			 *
+			 *  \return Boolean \c true if the CPU core clock was successfully altered, \c false if invalid parameters specified.
+			 */
+			static inline bool UC3CLK_SetCPUClockSource(const uint8_t Source,
+			                                            const uint32_t SourceFreq) ATTR_ALWAYS_INLINE;
+			static inline bool UC3CLK_SetCPUClockSource(const uint8_t Source,
+			                                            const uint32_t SourceFreq)
+			{
+				if (SourceFreq > AVR32_PM_CPU_MAX_FREQ)
+				  return false;
+
+				AVR32_FLASHC.FCR.fws = (SourceFreq > AVR32_FLASHC_FWS_0_MAX_FREQ) ? true : false;
+
+				switch (Source)
+				{
+					#if defined(AVR32_PM_MCCTRL_MCSEL_SLOW)
+					case CLOCK_SRC_SLOW_CLK:
+						AVR32_PM.MCCTRL.mcsel = AVR32_PM_MCCTRL_MCSEL_SLOW;
+						break;
+					#endif
+					#if defined(AVR32_PM_MCCTRL_MCSEL_OSC0)
+					case CLOCK_SRC_OSC0:
+						AVR32_PM.MCCTRL.mcsel = AVR32_PM_MCCTRL_MCSEL_OSC0;
+						break;
+					#endif
+					#if defined(AVR32_PM_MCCTRL_MCSEL_PLL0)
+					case CLOCK_SRC_PLL0:
+						AVR32_PM.MCCTRL.mcsel = AVR32_PM_MCCTRL_MCSEL_PLL0;
+						break;
+					#endif
+					default:
+						return false;
+				}
+
+				return true;
+			}
+
+	/* Disable C linkage for C++ Compilers: */
+		#if defined(__cplusplus)
+			}
+		#endif
+
+#endif
+
+/** @} */
+