Simon Glass | 932bc4a | 2015-08-30 16:55:28 -0600 | [diff] [blame] | 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 | /** |
Simon Glass | d1c1377 | 2015-09-01 19:19:37 -0600 | [diff] [blame] | 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 | /** |
Simon Glass | 932bc4a | 2015-08-30 16:55:28 -0600 | [diff] [blame] | 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 | |
Simon Glass | 344f366 | 2016-01-21 19:43:41 -0700 | [diff] [blame] | 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 | |
Simon Glass | 94906e4 | 2016-01-21 19:45:17 -0700 | [diff] [blame] | 77 | struct rk3288_cru; |
| 78 | struct rk3288_grf; |
| 79 | |
| 80 | void rkclk_configure_cpu(struct rk3288_cru *cru, struct rk3288_grf *grf); |
| 81 | |
Simon Glass | 932bc4a | 2015-08-30 16:55:28 -0600 | [diff] [blame] | 82 | #endif |