drivers/clk/tegra/clk-tegra124-dfll-fcpu.c

   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/init.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                 .entries = {
  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                         {          0UL, {       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, err;
  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->max_freq = cpu_max_freq_table[speedo_id];
 111
 112         soc->cvb = tegra_cvb_add_opp_table(soc->dev, tegra124_cpu_cvb_tables,
 113                                            ARRAY_SIZE(tegra124_cpu_cvb_tables),
 114                                            process_id, speedo_id, speedo_value,
 115                                            soc->max_freq);
 116         if (IS_ERR(soc->cvb)) {
 117                 dev_err(&pdev->dev, "couldn't add OPP table: %ld\n",
 118                         PTR_ERR(soc->cvb));
 119                 return PTR_ERR(soc->cvb);
 120         }
 121
 122         err = tegra_dfll_register(pdev, soc);
 123         if (err < 0) {
 124                 tegra_cvb_remove_opp_table(soc->dev, soc->cvb, soc->max_freq);
 125                 return err;
 126         }
 127
 128         return 0;
 129 }
 130
 131 static int tegra124_dfll_fcpu_remove(struct platform_device *pdev)
 132 {
 133         struct tegra_dfll_soc_data *soc;
 134
 135         soc = tegra_dfll_unregister(pdev);
 136         if (IS_ERR(soc))
 137                 dev_err(&pdev->dev, "failed to unregister DFLL: %ld\n",
 138                         PTR_ERR(soc));
 139
 140         tegra_cvb_remove_opp_table(soc->dev, soc->cvb, soc->max_freq);
 141
 142         return 0;
 143 }
 144
 145 static const struct of_device_id tegra124_dfll_fcpu_of_match[] = {
 146         { .compatible = "nvidia,tegra124-dfll", },
 147         { },
 148 };
 149
 150 static const struct dev_pm_ops tegra124_dfll_pm_ops = {
 151         SET_RUNTIME_PM_OPS(tegra_dfll_runtime_suspend,
 152                            tegra_dfll_runtime_resume, NULL)
 153 };
 154
 155 static struct platform_driver tegra124_dfll_fcpu_driver = {
 156         .probe = tegra124_dfll_fcpu_probe,
 157         .remove = tegra124_dfll_fcpu_remove,
 158         .driver = {
 159                 .name = "tegra124-dfll",
 160                 .of_match_table = tegra124_dfll_fcpu_of_match,
 161                 .pm = &tegra124_dfll_pm_ops,
 162         },
 163 };
 164 builtin_platform_driver(tegra124_dfll_fcpu_driver);