1 /* 2 * sh73a0 Core CPG Clocks 3 * 4 * Copyright (C) 2014 Ulrich Hecht 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; version 2 of the License. 9 */ 10 11 #include <linux/clk-provider.h> 12 #include <linux/clk/renesas.h> 13 #include <linux/init.h> 14 #include <linux/kernel.h> 15 #include <linux/of.h> 16 #include <linux/of_address.h> 17 #include <linux/slab.h> 18 #include <linux/spinlock.h> 19 20 struct sh73a0_cpg { 21 struct clk_onecell_data data; 22 spinlock_t lock; 23 void __iomem *reg; 24 }; 25 26 #define CPG_FRQCRA 0x00 27 #define CPG_FRQCRB 0x04 28 #define CPG_SD0CKCR 0x74 29 #define CPG_SD1CKCR 0x78 30 #define CPG_SD2CKCR 0x7c 31 #define CPG_PLLECR 0xd0 32 #define CPG_PLL0CR 0xd8 33 #define CPG_PLL1CR 0x28 34 #define CPG_PLL2CR 0x2c 35 #define CPG_PLL3CR 0xdc 36 #define CPG_CKSCR 0xc0 37 #define CPG_DSI0PHYCR 0x6c 38 #define CPG_DSI1PHYCR 0x70 39 40 #define CLK_ENABLE_ON_INIT BIT(0) 41 42 struct div4_clk { 43 const char *name; 44 const char *parent; 45 unsigned int reg; 46 unsigned int shift; 47 }; 48 49 static struct div4_clk div4_clks[] = { 50 { "zg", "pll0", CPG_FRQCRA, 16 }, 51 { "m3", "pll1", CPG_FRQCRA, 12 }, 52 { "b", "pll1", CPG_FRQCRA, 8 }, 53 { "m1", "pll1", CPG_FRQCRA, 4 }, 54 { "m2", "pll1", CPG_FRQCRA, 0 }, 55 { "zx", "pll1", CPG_FRQCRB, 12 }, 56 { "hp", "pll1", CPG_FRQCRB, 4 }, 57 { NULL, NULL, 0, 0 }, 58 }; 59 60 static const struct clk_div_table div4_div_table[] = { 61 { 0, 2 }, { 1, 3 }, { 2, 4 }, { 3, 6 }, { 4, 8 }, { 5, 12 }, 62 { 6, 16 }, { 7, 18 }, { 8, 24 }, { 10, 36 }, { 11, 48 }, 63 { 12, 7 }, { 0, 0 } 64 }; 65 66 static const struct clk_div_table z_div_table[] = { 67 /* ZSEL == 0 */ 68 { 0, 1 }, { 1, 1 }, { 2, 1 }, { 3, 1 }, { 4, 1 }, { 5, 1 }, 69 { 6, 1 }, { 7, 1 }, { 8, 1 }, { 9, 1 }, { 10, 1 }, { 11, 1 }, 70 { 12, 1 }, { 13, 1 }, { 14, 1 }, { 15, 1 }, 71 /* ZSEL == 1 */ 72 { 16, 2 }, { 17, 3 }, { 18, 4 }, { 19, 6 }, { 20, 8 }, { 21, 12 }, 73 { 22, 16 }, { 24, 24 }, { 27, 48 }, { 0, 0 } 74 }; 75 76 static struct clk * __init 77 sh73a0_cpg_register_clock(struct device_node *np, struct sh73a0_cpg *cpg, 78 const char *name) 79 { 80 const struct clk_div_table *table = NULL; 81 unsigned int shift, reg, width; 82 const char *parent_name; 83 unsigned int mult = 1; 84 unsigned int div = 1; 85 86 if (!strcmp(name, "main")) { 87 /* extal1, extal1_div2, extal2, extal2_div2 */ 88 u32 parent_idx = (clk_readl(cpg->reg + CPG_CKSCR) >> 28) & 3; 89 90 parent_name = of_clk_get_parent_name(np, parent_idx >> 1); 91 div = (parent_idx & 1) + 1; 92 } else if (!strncmp(name, "pll", 3)) { 93 void __iomem *enable_reg = cpg->reg; 94 u32 enable_bit = name[3] - '0'; 95 96 parent_name = "main"; 97 switch (enable_bit) { 98 case 0: 99 enable_reg += CPG_PLL0CR; 100 break; 101 case 1: 102 enable_reg += CPG_PLL1CR; 103 break; 104 case 2: 105 enable_reg += CPG_PLL2CR; 106 break; 107 case 3: 108 enable_reg += CPG_PLL3CR; 109 break; 110 default: 111 return ERR_PTR(-EINVAL); 112 } 113 if (clk_readl(cpg->reg + CPG_PLLECR) & BIT(enable_bit)) { 114 mult = ((clk_readl(enable_reg) >> 24) & 0x3f) + 1; 115 /* handle CFG bit for PLL1 and PLL2 */ 116 if (enable_bit == 1 || enable_bit == 2) 117 if (clk_readl(enable_reg) & BIT(20)) 118 mult *= 2; 119 } 120 } else if (!strcmp(name, "dsi0phy") || !strcmp(name, "dsi1phy")) { 121 u32 phy_no = name[3] - '0'; 122 void __iomem *dsi_reg = cpg->reg + 123 (phy_no ? CPG_DSI1PHYCR : CPG_DSI0PHYCR); 124 125 parent_name = phy_no ? "dsi1pck" : "dsi0pck"; 126 mult = __raw_readl(dsi_reg); 127 if (!(mult & 0x8000)) 128 mult = 1; 129 else 130 mult = (mult & 0x3f) + 1; 131 } else if (!strcmp(name, "z")) { 132 parent_name = "pll0"; 133 table = z_div_table; 134 reg = CPG_FRQCRB; 135 shift = 24; 136 width = 5; 137 } else { 138 struct div4_clk *c; 139 140 for (c = div4_clks; c->name; c++) { 141 if (!strcmp(name, c->name)) { 142 parent_name = c->parent; 143 table = div4_div_table; 144 reg = c->reg; 145 shift = c->shift; 146 width = 4; 147 break; 148 } 149 } 150 if (!c->name) 151 return ERR_PTR(-EINVAL); 152 } 153 154 if (!table) { 155 return clk_register_fixed_factor(NULL, name, parent_name, 0, 156 mult, div); 157 } else { 158 return clk_register_divider_table(NULL, name, parent_name, 0, 159 cpg->reg + reg, shift, width, 0, 160 table, &cpg->lock); 161 } 162 } 163 164 static void __init sh73a0_cpg_clocks_init(struct device_node *np) 165 { 166 struct sh73a0_cpg *cpg; 167 struct clk **clks; 168 unsigned int i; 169 int num_clks; 170 171 num_clks = of_property_count_strings(np, "clock-output-names"); 172 if (num_clks < 0) { 173 pr_err("%s: failed to count clocks\n", __func__); 174 return; 175 } 176 177 cpg = kzalloc(sizeof(*cpg), GFP_KERNEL); 178 clks = kcalloc(num_clks, sizeof(*clks), GFP_KERNEL); 179 if (cpg == NULL || clks == NULL) { 180 /* We're leaking memory on purpose, there's no point in cleaning 181 * up as the system won't boot anyway. 182 */ 183 return; 184 } 185 186 spin_lock_init(&cpg->lock); 187 188 cpg->data.clks = clks; 189 cpg->data.clk_num = num_clks; 190 191 cpg->reg = of_iomap(np, 0); 192 if (WARN_ON(cpg->reg == NULL)) 193 return; 194 195 /* Set SDHI clocks to a known state */ 196 clk_writel(0x108, cpg->reg + CPG_SD0CKCR); 197 clk_writel(0x108, cpg->reg + CPG_SD1CKCR); 198 clk_writel(0x108, cpg->reg + CPG_SD2CKCR); 199 200 for (i = 0; i < num_clks; ++i) { 201 const char *name; 202 struct clk *clk; 203 204 of_property_read_string_index(np, "clock-output-names", i, 205 &name); 206 207 clk = sh73a0_cpg_register_clock(np, cpg, name); 208 if (IS_ERR(clk)) 209 pr_err("%s: failed to register %s %s clock (%ld)\n", 210 __func__, np->name, name, PTR_ERR(clk)); 211 else 212 cpg->data.clks[i] = clk; 213 } 214 215 of_clk_add_provider(np, of_clk_src_onecell_get, &cpg->data); 216 } 217 CLK_OF_DECLARE(sh73a0_cpg_clks, "renesas,sh73a0-cpg-clocks", 218 sh73a0_cpg_clocks_init); 219