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On Rockchip SoCs we typically have a main clock device that uses the Soc clock driver. There is also a fixed clock for the oscillator. Add a function to obtain the core clock. Signed-off-by: Simon Glass <sjg@chromium.org>
72 lines
1.3 KiB
C
72 lines
1.3 KiB
C
/*
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* (C) Copyright 2015 Google, Inc
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#ifndef _ASM_ARCH_CLOCK_H
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#define _ASM_ARCH_CLOCK_H
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/* define pll mode */
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#define RKCLK_PLL_MODE_SLOW 0
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#define RKCLK_PLL_MODE_NORMAL 1
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enum {
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ROCKCHIP_SYSCON_NOC,
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ROCKCHIP_SYSCON_GRF,
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ROCKCHIP_SYSCON_SGRF,
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ROCKCHIP_SYSCON_PMU,
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};
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/* Standard Rockchip clock numbers */
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enum rk_clk_id {
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CLK_OSC,
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CLK_ARM,
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CLK_DDR,
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CLK_CODEC,
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CLK_GENERAL,
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CLK_NEW,
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CLK_COUNT,
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};
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static inline int rk_pll_id(enum rk_clk_id clk_id)
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{
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return clk_id - 1;
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}
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/**
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* clk_get_divisor() - Calculate the required clock divisior
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*
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* Given an input rate and a required output_rate, calculate the Rockchip
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* divisor needed to achieve this.
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*
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* @input_rate: Input clock rate in Hz
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* @output_rate: Output clock rate in Hz
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* @return divisor register value to use
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*/
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static inline u32 clk_get_divisor(ulong input_rate, uint output_rate)
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{
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uint clk_div;
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clk_div = input_rate / output_rate;
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clk_div = (clk_div + 1) & 0xfffe;
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return clk_div;
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}
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/**
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* rockchip_get_cru() - get a pointer to the clock/reset unit registers
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*
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* @return pointer to registers, or -ve error on error
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*/
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void *rockchip_get_cru(void);
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struct rk3288_cru;
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struct rk3288_grf;
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void rk3288_clk_configure_cpu(struct rk3288_cru *cru, struct rk3288_grf *grf);
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int rockchip_get_clk(struct udevice **devp);
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#endif
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