1 /* 2 * Tegra124 DFLL FCPU clock source driver 3 * 4 * Copyright (C) 2012-2014 NVIDIA Corporation. All rights reserved. 5 * 6 * Aleksandr Frid <afrid@nvidia.com> 7 * Paul Walmsley <pwalmsley@nvidia.com> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, but WITHOUT 14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 16 * more details. 17 * 18 */ 19 20 #include <linux/cpu.h> 21 #include <linux/err.h> 22 #include <linux/kernel.h> 23 #include <linux/module.h> 24 #include <linux/platform_device.h> 25 #include <soc/tegra/fuse.h> 26 27 #include "clk.h" 28 #include "clk-dfll.h" 29 #include "cvb.h" 30 31 /* Maximum CPU frequency, indexed by CPU speedo id */ 32 static const unsigned long cpu_max_freq_table[] = { 33 [0] = 2014500000UL, 34 [1] = 2320500000UL, 35 [2] = 2116500000UL, 36 [3] = 2524500000UL, 37 }; 38 39 static const struct cvb_table tegra124_cpu_cvb_tables[] = { 40 { 41 .speedo_id = -1, 42 .process_id = -1, 43 .min_millivolts = 900, 44 .max_millivolts = 1260, 45 .alignment = { 46 .step_uv = 10000, /* 10mV */ 47 }, 48 .speedo_scale = 100, 49 .voltage_scale = 1000, 50 .cvb_table = { 51 {204000000UL, {1112619, -29295, 402} }, 52 {306000000UL, {1150460, -30585, 402} }, 53 {408000000UL, {1190122, -31865, 402} }, 54 {510000000UL, {1231606, -33155, 402} }, 55 {612000000UL, {1274912, -34435, 402} }, 56 {714000000UL, {1320040, -35725, 402} }, 57 {816000000UL, {1366990, -37005, 402} }, 58 {918000000UL, {1415762, -38295, 402} }, 59 {1020000000UL, {1466355, -39575, 402} }, 60 {1122000000UL, {1518771, -40865, 402} }, 61 {1224000000UL, {1573009, -42145, 402} }, 62 {1326000000UL, {1629068, -43435, 402} }, 63 {1428000000UL, {1686950, -44715, 402} }, 64 {1530000000UL, {1746653, -46005, 402} }, 65 {1632000000UL, {1808179, -47285, 402} }, 66 {1734000000UL, {1871526, -48575, 402} }, 67 {1836000000UL, {1936696, -49855, 402} }, 68 {1938000000UL, {2003687, -51145, 402} }, 69 {2014500000UL, {2054787, -52095, 402} }, 70 {2116500000UL, {2124957, -53385, 402} }, 71 {2218500000UL, {2196950, -54665, 402} }, 72 {2320500000UL, {2270765, -55955, 402} }, 73 {2422500000UL, {2346401, -57235, 402} }, 74 {2524500000UL, {2437299, -58535, 402} }, 75 {0, { 0, 0, 0} }, 76 }, 77 .cpu_dfll_data = { 78 .tune0_low = 0x005020ff, 79 .tune0_high = 0x005040ff, 80 .tune1 = 0x00000060, 81 } 82 }, 83 }; 84 85 static int tegra124_dfll_fcpu_probe(struct platform_device *pdev) 86 { 87 int process_id, speedo_id, speedo_value; 88 struct tegra_dfll_soc_data *soc; 89 90 process_id = tegra_sku_info.cpu_process_id; 91 speedo_id = tegra_sku_info.cpu_speedo_id; 92 speedo_value = tegra_sku_info.cpu_speedo_value; 93 94 if (speedo_id >= ARRAY_SIZE(cpu_max_freq_table)) { 95 dev_err(&pdev->dev, "unknown max CPU freq for speedo_id=%d\n", 96 speedo_id); 97 return -ENODEV; 98 } 99 100 soc = devm_kzalloc(&pdev->dev, sizeof(*soc), GFP_KERNEL); 101 if (!soc) 102 return -ENOMEM; 103 104 soc->dev = get_cpu_device(0); 105 if (!soc->dev) { 106 dev_err(&pdev->dev, "no CPU0 device\n"); 107 return -ENODEV; 108 } 109 110 soc->cvb = tegra_cvb_build_opp_table(tegra124_cpu_cvb_tables, 111 ARRAY_SIZE(tegra124_cpu_cvb_tables), 112 process_id, speedo_id, speedo_value, 113 cpu_max_freq_table[speedo_id], 114 soc->dev); 115 if (IS_ERR(soc->cvb)) { 116 dev_err(&pdev->dev, "couldn't add OPP table: %ld\n", 117 PTR_ERR(soc->cvb)); 118 return PTR_ERR(soc->cvb); 119 } 120 121 122 return tegra_dfll_register(pdev, soc); 123 } 124 125 static const struct of_device_id tegra124_dfll_fcpu_of_match[] = { 126 { .compatible = "nvidia,tegra124-dfll", }, 127 { }, 128 }; 129 MODULE_DEVICE_TABLE(of, tegra124_dfll_fcpu_of_match); 130 131 static const struct dev_pm_ops tegra124_dfll_pm_ops = { 132 SET_RUNTIME_PM_OPS(tegra_dfll_runtime_suspend, 133 tegra_dfll_runtime_resume, NULL) 134 }; 135 136 static struct platform_driver tegra124_dfll_fcpu_driver = { 137 .probe = tegra124_dfll_fcpu_probe, 138 .remove = tegra_dfll_unregister, 139 .driver = { 140 .name = "tegra124-dfll", 141 .of_match_table = tegra124_dfll_fcpu_of_match, 142 .pm = &tegra124_dfll_pm_ops, 143 }, 144 }; 145 146 static int __init tegra124_dfll_fcpu_init(void) 147 { 148 return platform_driver_register(&tegra124_dfll_fcpu_driver); 149 } 150 module_init(tegra124_dfll_fcpu_init); 151 152 static void __exit tegra124_dfll_fcpu_exit(void) 153 { 154 platform_driver_unregister(&tegra124_dfll_fcpu_driver); 155 } 156 module_exit(tegra124_dfll_fcpu_exit); 157 158 MODULE_DESCRIPTION("Tegra124 DFLL clock source driver"); 159 MODULE_LICENSE("GPL v2"); 160 MODULE_AUTHOR("Aleksandr Frid <afrid@nvidia.com>"); 161 MODULE_AUTHOR("Paul Walmsley <pwalmsley@nvidia.com>"); 162