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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 | /* * r8a7779 Core CPG Clocks * * Copyright (C) 2013, 2014 Horms Solutions Ltd. * * Contact: Simon Horman <horms@verge.net.au> * * 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; version 2 of the License. */ #include <linux/clk-provider.h> #include <linux/clk/renesas.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <dt-bindings/clock/r8a7779-clock.h> #define CPG_NUM_CLOCKS (R8A7779_CLK_OUT + 1) struct r8a7779_cpg { struct clk_onecell_data data; spinlock_t lock; void __iomem *reg; }; /* ----------------------------------------------------------------------------- * CPG Clock Data */ /* * MD1 = 1 MD1 = 0 * (PLLA = 1500) (PLLA = 1600) * (MHz) (MHz) *------------------------------------------------+-------------------- * clkz 1000 (2/3) 800 (1/2) * clkzs 250 (1/6) 200 (1/8) * clki 750 (1/2) 800 (1/2) * clks 250 (1/6) 200 (1/8) * clks1 125 (1/12) 100 (1/16) * clks3 187.5 (1/8) 200 (1/8) * clks4 93.7 (1/16) 100 (1/16) * clkp 62.5 (1/24) 50 (1/32) * clkg 62.5 (1/24) 66.6 (1/24) * clkb, CLKOUT * (MD2 = 0) 62.5 (1/24) 66.6 (1/24) * (MD2 = 1) 41.6 (1/36) 50 (1/32) */ #define CPG_CLK_CONFIG_INDEX(md) (((md) & (BIT(2)|BIT(1))) >> 1) struct cpg_clk_config { unsigned int z_mult; unsigned int z_div; unsigned int zs_and_s_div; unsigned int s1_div; unsigned int p_div; unsigned int b_and_out_div; }; static const struct cpg_clk_config cpg_clk_configs[4] __initconst = { { 1, 2, 8, 16, 32, 24 }, { 2, 3, 6, 12, 24, 24 }, { 1, 2, 8, 16, 32, 32 }, { 2, 3, 6, 12, 24, 36 }, }; /* * MD PLLA Ratio * 12 11 *------------------------ * 0 0 x42 * 0 1 x48 * 1 0 x56 * 1 1 x64 */ #define CPG_PLLA_MULT_INDEX(md) (((md) & (BIT(12)|BIT(11))) >> 11) static const unsigned int cpg_plla_mult[4] __initconst = { 42, 48, 56, 64 }; /* ----------------------------------------------------------------------------- * Initialization */ static u32 cpg_mode __initdata; static struct clk * __init r8a7779_cpg_register_clock(struct device_node *np, struct r8a7779_cpg *cpg, const struct cpg_clk_config *config, unsigned int plla_mult, const char *name) { const char *parent_name = "plla"; unsigned int mult = 1; unsigned int div = 1; if (!strcmp(name, "plla")) { parent_name = of_clk_get_parent_name(np, 0); mult = plla_mult; } else if (!strcmp(name, "z")) { div = config->z_div; mult = config->z_mult; } else if (!strcmp(name, "zs") || !strcmp(name, "s")) { div = config->zs_and_s_div; } else if (!strcmp(name, "s1")) { div = config->s1_div; } else if (!strcmp(name, "p")) { div = config->p_div; } else if (!strcmp(name, "b") || !strcmp(name, "out")) { div = config->b_and_out_div; } else { return ERR_PTR(-EINVAL); } return clk_register_fixed_factor(NULL, name, parent_name, 0, mult, div); } static void __init r8a7779_cpg_clocks_init(struct device_node *np) { const struct cpg_clk_config *config; struct r8a7779_cpg *cpg; struct clk **clks; unsigned int i, plla_mult; int num_clks; num_clks = of_property_count_strings(np, "clock-output-names"); if (num_clks < 0) { pr_err("%s: failed to count clocks\n", __func__); return; } cpg = kzalloc(sizeof(*cpg), GFP_KERNEL); clks = kzalloc(CPG_NUM_CLOCKS * sizeof(*clks), GFP_KERNEL); if (cpg == NULL || clks == NULL) { /* We're leaking memory on purpose, there's no point in cleaning * up as the system won't boot anyway. */ return; } spin_lock_init(&cpg->lock); cpg->data.clks = clks; cpg->data.clk_num = num_clks; config = &cpg_clk_configs[CPG_CLK_CONFIG_INDEX(cpg_mode)]; plla_mult = cpg_plla_mult[CPG_PLLA_MULT_INDEX(cpg_mode)]; for (i = 0; i < num_clks; ++i) { const char *name; struct clk *clk; of_property_read_string_index(np, "clock-output-names", i, &name); clk = r8a7779_cpg_register_clock(np, cpg, config, plla_mult, name); if (IS_ERR(clk)) pr_err("%s: failed to register %s %s clock (%ld)\n", __func__, np->name, name, PTR_ERR(clk)); else cpg->data.clks[i] = clk; } of_clk_add_provider(np, of_clk_src_onecell_get, &cpg->data); cpg_mstp_add_clk_domain(np); } CLK_OF_DECLARE(r8a7779_cpg_clks, "renesas,r8a7779-cpg-clocks", r8a7779_cpg_clocks_init); void __init r8a7779_clocks_init(u32 mode) { cpg_mode = mode; of_clk_init(NULL); } |