1 /*
2  * (C) Copyright 2015 Google, Inc
3  *
4  * SPDX-License-Identifier:	GPL-2.0
5  */
6 
7 #ifndef _ASM_ARCH_CLOCK_H
8 #define _ASM_ARCH_CLOCK_H
9 
10 /* define pll mode */
11 #define RKCLK_PLL_MODE_SLOW		0
12 #define RKCLK_PLL_MODE_NORMAL		1
13 
14 enum {
15 	ROCKCHIP_SYSCON_NOC,
16 	ROCKCHIP_SYSCON_GRF,
17 	ROCKCHIP_SYSCON_SGRF,
18 	ROCKCHIP_SYSCON_PMU,
19 };
20 
21 /* Standard Rockchip clock numbers */
22 enum rk_clk_id {
23 	CLK_OSC,
24 	CLK_ARM,
25 	CLK_DDR,
26 	CLK_CODEC,
27 	CLK_GENERAL,
28 	CLK_NEW,
29 
30 	CLK_COUNT,
31 };
32 
33 static inline int rk_pll_id(enum rk_clk_id clk_id)
34 {
35 	return clk_id - 1;
36 }
37 
38 /**
39  * clk_get_divisor() - Calculate the required clock divisior
40  *
41  * Given an input rate and a required output_rate, calculate the Rockchip
42  * divisor needed to achieve this.
43  *
44  * @input_rate:		Input clock rate in Hz
45  * @output_rate:	Output clock rate in Hz
46  * @return divisor register value to use
47  */
48 static inline u32 clk_get_divisor(ulong input_rate, uint output_rate)
49 {
50 	uint clk_div;
51 
52 	clk_div = input_rate / output_rate;
53 	clk_div = (clk_div + 1) & 0xfffe;
54 
55 	return clk_div;
56 }
57 
58 /**
59  * rockchip_get_cru() - get a pointer to the clock/reset unit registers
60  *
61  * @return pointer to registers, or -ve error on error
62  */
63 void *rockchip_get_cru(void);
64 
65 /**
66  * rkclk_get_clk() - get a pointer to a given clock
67  *
68  * This is an internal function - use outside the clock subsystem indicates
69  * that work is needed!
70  *
71  * @clk_id:	Clock requested
72  * @devp:	Returns a pointer to that clock
73  * @return 0 if OK, -ve on error
74  */
75 int rkclk_get_clk(enum rk_clk_id clk_id, struct udevice **devp);
76 
77 struct rk3288_cru;
78 struct rk3288_grf;
79 
80 void rkclk_configure_cpu(struct rk3288_cru *cru, struct rk3288_grf *grf);
81 
82 #endif
83