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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 | /* * Copyright 2013 Emilio López * Emilio López <emilio@elopez.com.ar> * * Copyright 2015 Maxime Ripard * Maxime Ripard <maxime.ripard@free-electrons.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/clk-provider.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/slab.h> #include <dt-bindings/clock/sun4i-a10-pll2.h> #define SUN4I_PLL2_ENABLE 31 #define SUN4I_PLL2_PRE_DIV_SHIFT 0 #define SUN4I_PLL2_PRE_DIV_WIDTH 5 #define SUN4I_PLL2_PRE_DIV_MASK GENMASK(SUN4I_PLL2_PRE_DIV_WIDTH - 1, 0) #define SUN4I_PLL2_N_SHIFT 8 #define SUN4I_PLL2_N_WIDTH 7 #define SUN4I_PLL2_N_MASK GENMASK(SUN4I_PLL2_N_WIDTH - 1, 0) #define SUN4I_PLL2_POST_DIV_SHIFT 26 #define SUN4I_PLL2_POST_DIV_WIDTH 4 #define SUN4I_PLL2_POST_DIV_MASK GENMASK(SUN4I_PLL2_POST_DIV_WIDTH - 1, 0) #define SUN4I_PLL2_POST_DIV_VALUE 4 #define SUN4I_PLL2_OUTPUTS 4 static DEFINE_SPINLOCK(sun4i_a10_pll2_lock); static void __init sun4i_pll2_setup(struct device_node *node, int post_div_offset) { const char *clk_name = node->name, *parent; struct clk **clks, *base_clk, *prediv_clk; struct clk_onecell_data *clk_data; struct clk_multiplier *mult; struct clk_gate *gate; void __iomem *reg; u32 val; reg = of_io_request_and_map(node, 0, of_node_full_name(node)); if (IS_ERR(reg)) return; clk_data = kzalloc(sizeof(*clk_data), GFP_KERNEL); if (!clk_data) goto err_unmap; clks = kcalloc(SUN4I_PLL2_OUTPUTS, sizeof(struct clk *), GFP_KERNEL); if (!clks) goto err_free_data; parent = of_clk_get_parent_name(node, 0); prediv_clk = clk_register_divider(NULL, "pll2-prediv", parent, 0, reg, SUN4I_PLL2_PRE_DIV_SHIFT, SUN4I_PLL2_PRE_DIV_WIDTH, CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO, &sun4i_a10_pll2_lock); if (IS_ERR(prediv_clk)) { pr_err("Couldn't register the prediv clock\n"); goto err_free_array; } /* Setup the gate part of the PLL2 */ gate = kzalloc(sizeof(struct clk_gate), GFP_KERNEL); if (!gate) goto err_unregister_prediv; gate->reg = reg; gate->bit_idx = SUN4I_PLL2_ENABLE; gate->lock = &sun4i_a10_pll2_lock; /* Setup the multiplier part of the PLL2 */ mult = kzalloc(sizeof(struct clk_multiplier), GFP_KERNEL); if (!mult) goto err_free_gate; mult->reg = reg; mult->shift = SUN4I_PLL2_N_SHIFT; mult->width = 7; mult->flags = CLK_MULTIPLIER_ZERO_BYPASS | CLK_MULTIPLIER_ROUND_CLOSEST; mult->lock = &sun4i_a10_pll2_lock; parent = __clk_get_name(prediv_clk); base_clk = clk_register_composite(NULL, "pll2-base", &parent, 1, NULL, NULL, &mult->hw, &clk_multiplier_ops, &gate->hw, &clk_gate_ops, CLK_SET_RATE_PARENT); if (IS_ERR(base_clk)) { pr_err("Couldn't register the base multiplier clock\n"); goto err_free_multiplier; } parent = __clk_get_name(base_clk); /* * PLL2-1x * * This is supposed to have a post divider, but we won't need * to use it, we just need to initialise it to 4, and use a * fixed divider. */ val = readl(reg); val &= ~(SUN4I_PLL2_POST_DIV_MASK << SUN4I_PLL2_POST_DIV_SHIFT); val |= (SUN4I_PLL2_POST_DIV_VALUE - post_div_offset) << SUN4I_PLL2_POST_DIV_SHIFT; writel(val, reg); of_property_read_string_index(node, "clock-output-names", SUN4I_A10_PLL2_1X, &clk_name); clks[SUN4I_A10_PLL2_1X] = clk_register_fixed_factor(NULL, clk_name, parent, CLK_SET_RATE_PARENT, 1, SUN4I_PLL2_POST_DIV_VALUE); WARN_ON(IS_ERR(clks[SUN4I_A10_PLL2_1X])); /* * PLL2-2x * * This clock doesn't use the post divider, and really is just * a fixed divider from the PLL2 base clock. */ of_property_read_string_index(node, "clock-output-names", SUN4I_A10_PLL2_2X, &clk_name); clks[SUN4I_A10_PLL2_2X] = clk_register_fixed_factor(NULL, clk_name, parent, CLK_SET_RATE_PARENT, 1, 2); WARN_ON(IS_ERR(clks[SUN4I_A10_PLL2_2X])); /* PLL2-4x */ of_property_read_string_index(node, "clock-output-names", SUN4I_A10_PLL2_4X, &clk_name); clks[SUN4I_A10_PLL2_4X] = clk_register_fixed_factor(NULL, clk_name, parent, CLK_SET_RATE_PARENT, 1, 1); WARN_ON(IS_ERR(clks[SUN4I_A10_PLL2_4X])); /* PLL2-8x */ of_property_read_string_index(node, "clock-output-names", SUN4I_A10_PLL2_8X, &clk_name); clks[SUN4I_A10_PLL2_8X] = clk_register_fixed_factor(NULL, clk_name, parent, CLK_SET_RATE_PARENT, 2, 1); WARN_ON(IS_ERR(clks[SUN4I_A10_PLL2_8X])); clk_data->clks = clks; clk_data->clk_num = SUN4I_PLL2_OUTPUTS; of_clk_add_provider(node, of_clk_src_onecell_get, clk_data); return; err_free_multiplier: kfree(mult); err_free_gate: kfree(gate); err_unregister_prediv: clk_unregister_divider(prediv_clk); err_free_array: kfree(clks); err_free_data: kfree(clk_data); err_unmap: iounmap(reg); } static void __init sun4i_a10_pll2_setup(struct device_node *node) { sun4i_pll2_setup(node, 0); } CLK_OF_DECLARE(sun4i_a10_pll2, "allwinner,sun4i-a10-pll2-clk", sun4i_a10_pll2_setup); static void __init sun5i_a13_pll2_setup(struct device_node *node) { sun4i_pll2_setup(node, 1); } CLK_OF_DECLARE(sun5i_a13_pll2, "allwinner,sun5i-a13-pll2-clk", sun5i_a13_pll2_setup); |