1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2012, 2013, NVIDIA CORPORATION. All rights reserved. 4 */ 5 6 #include <linux/io.h> 7 #include <linux/clk-provider.h> 8 #include <linux/of.h> 9 #include <linux/of_address.h> 10 #include <linux/delay.h> 11 #include <linux/export.h> 12 #include <linux/clk/tegra.h> 13 14 #include "clk.h" 15 #include "clk-id.h" 16 17 #define OSC_CTRL 0x50 18 #define OSC_CTRL_OSC_FREQ_SHIFT 28 19 #define OSC_CTRL_PLL_REF_DIV_SHIFT 26 20 #define OSC_CTRL_MASK (0x3f2 | \ 21 (0xf << OSC_CTRL_OSC_FREQ_SHIFT)) 22 23 static u32 osc_ctrl_ctx; 24 25 int __init tegra_osc_clk_init(void __iomem *clk_base, struct tegra_clk *clks, 26 unsigned long *input_freqs, unsigned int num, 27 unsigned int clk_m_div, unsigned long *osc_freq, 28 unsigned long *pll_ref_freq) 29 { 30 struct clk *clk, *osc; 31 struct clk **dt_clk; 32 u32 val, pll_ref_div; 33 unsigned osc_idx; 34 35 val = readl_relaxed(clk_base + OSC_CTRL); 36 osc_ctrl_ctx = val & OSC_CTRL_MASK; 37 osc_idx = val >> OSC_CTRL_OSC_FREQ_SHIFT; 38 39 if (osc_idx < num) 40 *osc_freq = input_freqs[osc_idx]; 41 else 42 *osc_freq = 0; 43 44 if (!*osc_freq) { 45 WARN_ON(1); 46 return -EINVAL; 47 } 48 49 dt_clk = tegra_lookup_dt_id(tegra_clk_osc, clks); 50 if (!dt_clk) 51 return 0; 52 53 osc = clk_register_fixed_rate(NULL, "osc", NULL, 0, *osc_freq); 54 *dt_clk = osc; 55 56 /* osc_div2 */ 57 dt_clk = tegra_lookup_dt_id(tegra_clk_osc_div2, clks); 58 if (dt_clk) { 59 clk = clk_register_fixed_factor(NULL, "osc_div2", "osc", 60 0, 1, 2); 61 *dt_clk = clk; 62 } 63 64 /* osc_div4 */ 65 dt_clk = tegra_lookup_dt_id(tegra_clk_osc_div4, clks); 66 if (dt_clk) { 67 clk = clk_register_fixed_factor(NULL, "osc_div4", "osc", 68 0, 1, 4); 69 *dt_clk = clk; 70 } 71 72 dt_clk = tegra_lookup_dt_id(tegra_clk_clk_m, clks); 73 if (!dt_clk) 74 return 0; 75 76 clk = clk_register_fixed_factor(NULL, "clk_m", "osc", 77 0, 1, clk_m_div); 78 *dt_clk = clk; 79 80 /* pll_ref */ 81 val = (val >> OSC_CTRL_PLL_REF_DIV_SHIFT) & 3; 82 pll_ref_div = 1 << val; 83 dt_clk = tegra_lookup_dt_id(tegra_clk_pll_ref, clks); 84 if (!dt_clk) 85 return 0; 86 87 clk = clk_register_fixed_factor(NULL, "pll_ref", "osc", 88 0, 1, pll_ref_div); 89 *dt_clk = clk; 90 91 if (pll_ref_freq) 92 *pll_ref_freq = *osc_freq / pll_ref_div; 93 94 return 0; 95 } 96 97 void __init tegra_fixed_clk_init(struct tegra_clk *tegra_clks) 98 { 99 struct clk *clk; 100 struct clk **dt_clk; 101 102 /* clk_32k */ 103 dt_clk = tegra_lookup_dt_id(tegra_clk_clk_32k, tegra_clks); 104 if (dt_clk) { 105 clk = clk_register_fixed_rate(NULL, "clk_32k", NULL, 0, 32768); 106 *dt_clk = clk; 107 } 108 } 109 110 void tegra_clk_osc_resume(void __iomem *clk_base) 111 { 112 u32 val; 113 114 val = readl_relaxed(clk_base + OSC_CTRL) & ~OSC_CTRL_MASK; 115 val |= osc_ctrl_ctx; 116 writel_relaxed(val, clk_base + OSC_CTRL); 117 fence_udelay(2, clk_base); 118 } 119