1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Marvell MV98DX3236 SoC clocks 4 * 5 * Copyright (C) 2012 Marvell 6 * 7 * Gregory CLEMENT <gregory.clement@free-electrons.com> 8 * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> 9 * Andrew Lunn <andrew@lunn.ch> 10 * 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/clk-provider.h> 15 #include <linux/io.h> 16 #include <linux/of.h> 17 #include "common.h" 18 19 20 /* 21 * For 98DX4251 Sample At Reset the CPU, DDR and Main PLL clocks are all 22 * defined at the same time 23 * 24 * SAR1[20:18] : CPU frequency DDR frequency MPLL frequency 25 * 0 = 400 MHz 400 MHz 800 MHz 26 * 2 = 667 MHz 667 MHz 2000 MHz 27 * 3 = 800 MHz 800 MHz 1600 MHz 28 * others reserved. 29 * 30 * For 98DX3236 Sample At Reset the CPU, DDR and Main PLL clocks are all 31 * defined at the same time 32 * 33 * SAR1[20:18] : CPU frequency DDR frequency MPLL frequency 34 * 1 = 667 MHz 667 MHz 2000 MHz 35 * 2 = 400 MHz 400 MHz 400 MHz 36 * 3 = 800 MHz 800 MHz 800 MHz 37 * 5 = 800 MHz 400 MHz 800 MHz 38 * others reserved. 39 */ 40 41 #define SAR1_MV98DX3236_CPU_DDR_MPLL_FREQ_OPT 18 42 #define SAR1_MV98DX3236_CPU_DDR_MPLL_FREQ_OPT_MASK 0x7 43 44 static u32 __init mv98dx3236_get_tclk_freq(void __iomem *sar) 45 { 46 /* Tclk = 200MHz, no SaR dependency */ 47 return 200000000; 48 } 49 50 static const u32 mv98dx3236_cpu_frequencies[] __initconst = { 51 0, 52 667000000, 53 400000000, 54 800000000, 55 0, 56 800000000, 57 0, 0, 58 }; 59 60 static const u32 mv98dx4251_cpu_frequencies[] __initconst = { 61 400000000, 62 0, 63 667000000, 64 800000000, 65 0, 0, 0, 0, 66 }; 67 68 static u32 __init mv98dx3236_get_cpu_freq(void __iomem *sar) 69 { 70 u32 cpu_freq = 0; 71 u8 cpu_freq_select = 0; 72 73 cpu_freq_select = ((readl(sar) >> SAR1_MV98DX3236_CPU_DDR_MPLL_FREQ_OPT) & 74 SAR1_MV98DX3236_CPU_DDR_MPLL_FREQ_OPT_MASK); 75 76 if (of_machine_is_compatible("marvell,armadaxp-98dx4251")) 77 cpu_freq = mv98dx4251_cpu_frequencies[cpu_freq_select]; 78 else if (of_machine_is_compatible("marvell,armadaxp-98dx3236")) 79 cpu_freq = mv98dx3236_cpu_frequencies[cpu_freq_select]; 80 81 if (!cpu_freq) 82 pr_err("CPU freq select unsupported %d\n", cpu_freq_select); 83 84 return cpu_freq; 85 } 86 87 enum { 88 MV98DX3236_CPU_TO_DDR, 89 MV98DX3236_CPU_TO_MPLL 90 }; 91 92 static const struct coreclk_ratio mv98dx3236_core_ratios[] __initconst = { 93 { .id = MV98DX3236_CPU_TO_DDR, .name = "ddrclk" }, 94 { .id = MV98DX3236_CPU_TO_MPLL, .name = "mpll" }, 95 }; 96 97 static const int __initconst mv98dx3236_cpu_mpll_ratios[8][2] = { 98 {0, 1}, {3, 1}, {1, 1}, {1, 1}, 99 {0, 1}, {1, 1}, {0, 1}, {0, 1}, 100 }; 101 102 static const int __initconst mv98dx3236_cpu_ddr_ratios[8][2] = { 103 {0, 1}, {1, 1}, {1, 1}, {1, 1}, 104 {0, 1}, {1, 2}, {0, 1}, {0, 1}, 105 }; 106 107 static const int __initconst mv98dx4251_cpu_mpll_ratios[8][2] = { 108 {2, 1}, {0, 1}, {3, 1}, {2, 1}, 109 {0, 1}, {0, 1}, {0, 1}, {0, 1}, 110 }; 111 112 static const int __initconst mv98dx4251_cpu_ddr_ratios[8][2] = { 113 {1, 1}, {0, 1}, {1, 1}, {1, 1}, 114 {0, 1}, {0, 1}, {0, 1}, {0, 1}, 115 }; 116 117 static void __init mv98dx3236_get_clk_ratio( 118 void __iomem *sar, int id, int *mult, int *div) 119 { 120 u32 opt = ((readl(sar) >> SAR1_MV98DX3236_CPU_DDR_MPLL_FREQ_OPT) & 121 SAR1_MV98DX3236_CPU_DDR_MPLL_FREQ_OPT_MASK); 122 123 switch (id) { 124 case MV98DX3236_CPU_TO_DDR: 125 if (of_machine_is_compatible("marvell,armadaxp-98dx4251")) { 126 *mult = mv98dx4251_cpu_ddr_ratios[opt][0]; 127 *div = mv98dx4251_cpu_ddr_ratios[opt][1]; 128 } else if (of_machine_is_compatible("marvell,armadaxp-98dx3236")) { 129 *mult = mv98dx3236_cpu_ddr_ratios[opt][0]; 130 *div = mv98dx3236_cpu_ddr_ratios[opt][1]; 131 } 132 break; 133 case MV98DX3236_CPU_TO_MPLL: 134 if (of_machine_is_compatible("marvell,armadaxp-98dx4251")) { 135 *mult = mv98dx4251_cpu_mpll_ratios[opt][0]; 136 *div = mv98dx4251_cpu_mpll_ratios[opt][1]; 137 } else if (of_machine_is_compatible("marvell,armadaxp-98dx3236")) { 138 *mult = mv98dx3236_cpu_mpll_ratios[opt][0]; 139 *div = mv98dx3236_cpu_mpll_ratios[opt][1]; 140 } 141 break; 142 } 143 } 144 145 static const struct coreclk_soc_desc mv98dx3236_core_clocks = { 146 .get_tclk_freq = mv98dx3236_get_tclk_freq, 147 .get_cpu_freq = mv98dx3236_get_cpu_freq, 148 .get_clk_ratio = mv98dx3236_get_clk_ratio, 149 .ratios = mv98dx3236_core_ratios, 150 .num_ratios = ARRAY_SIZE(mv98dx3236_core_ratios), 151 }; 152 153 154 /* 155 * Clock Gating Control 156 */ 157 158 static const struct clk_gating_soc_desc mv98dx3236_gating_desc[] __initconst = { 159 { "ge1", NULL, 3, 0 }, 160 { "ge0", NULL, 4, 0 }, 161 { "pex00", NULL, 5, 0 }, 162 { "sdio", NULL, 17, 0 }, 163 { "usb0", NULL, 18, 0 }, 164 { "xor0", NULL, 22, 0 }, 165 { } 166 }; 167 168 static void __init mv98dx3236_clk_init(struct device_node *np) 169 { 170 struct device_node *cgnp = 171 of_find_compatible_node(NULL, NULL, "marvell,mv98dx3236-gating-clock"); 172 173 mvebu_coreclk_setup(np, &mv98dx3236_core_clocks); 174 175 if (cgnp) { 176 mvebu_clk_gating_setup(cgnp, mv98dx3236_gating_desc); 177 of_node_put(cgnp); 178 } 179 } 180 CLK_OF_DECLARE(mv98dx3236_clk, "marvell,mv98dx3236-core-clock", mv98dx3236_clk_init); 181