sys-clk.c File Reference

System clock driver for Allwinner (sunxi) platforms. More...

#include <io.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <types.h>
#include <log.h>

Include dependency graph for sys-clk.c:

Functions
void	__attribute__ ((weak))
	Initialize system clocks.

Variables
uint32_t	current_hosc_freq
	Current high-speed oscillator frequency.

Detailed Description

System clock driver for Allwinner (sunxi) platforms.

This file provides weak implementations of clock-related functions that can be overridden by platform-specific code.

Function Documentation

__attribute__()

void __attribute__

(

(weak)

)

Initialize system clocks.

Set CPU PLL frequency.

Get peripheral 1x clock rate.

Initialize USB clocks.

Deinitialize USB clocks.

Dump clock information.

Reset system clocks.

Get high-speed oscillator type.

Pre-initialize system clocks.

This weak function initializes all system clocks. Platform-specific implementations should override this function.

This weak function performs preliminary clock initialization before the main clock initialization. Platform-specific implementations should override this function.

This weak function returns the type/frequency of the high-speed oscillator (HOSC). The default implementation returns 24 MHz.

Returns

High-speed oscillator frequency in MHz

This weak function resets system clocks to their default state. Platform-specific implementations should override this function.

This weak function dumps information about the current clock configuration for debugging purposes. Platform-specific implementations should override this function.

This weak function deinitializes clocks for USB controllers. Platform-specific implementations should override this function.

This weak function initializes clocks for USB controllers. Platform-specific implementations should override this function.

This weak function returns the frequency of the peripheral 1x clock. The default implementation returns 0.

Returns

Peripheral 1x clock frequency in Hz

This weak function configures the CPU PLL to the specified frequency. Platform-specific implementations should override this function.

Parameters

freq	Target frequency in Hz

Variable Documentation

current_hosc_freq

uint32_t current_hosc_freq

extern

Current high-speed oscillator frequency.

This external variable holds the current frequency of the high-speed oscillator (HOSC) in MHz.

Current high-speed oscillator frequency.