clk-tegra124-dfll-fcpu.c
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/*
* Tegra124 DFLL FCPU clock source driver
*
* Copyright (C) 2012-2014 NVIDIA Corporation. All rights reserved.
*
* Aleksandr Frid <afrid@nvidia.com>
* Paul Walmsley <pwalmsley@nvidia.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
*/
#include <linux/cpu.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <soc/tegra/fuse.h>
#include "clk.h"
#include "clk-dfll.h"
#include "cvb.h"
/* Maximum CPU frequency, indexed by CPU speedo id */
static const unsigned long cpu_max_freq_table[] = {
[0] = 2014500000UL,
[1] = 2320500000UL,
[2] = 2116500000UL,
[3] = 2524500000UL,
};
static const struct cvb_table tegra124_cpu_cvb_tables[] = {
{
.speedo_id = -1,
.process_id = -1,
.min_millivolts = 900,
.max_millivolts = 1260,
.alignment = {
.step_uv = 10000, /* 10mV */
},
.speedo_scale = 100,
.voltage_scale = 1000,
.cvb_table = {
{204000000UL, {1112619, -29295, 402} },
{306000000UL, {1150460, -30585, 402} },
{408000000UL, {1190122, -31865, 402} },
{510000000UL, {1231606, -33155, 402} },
{612000000UL, {1274912, -34435, 402} },
{714000000UL, {1320040, -35725, 402} },
{816000000UL, {1366990, -37005, 402} },
{918000000UL, {1415762, -38295, 402} },
{1020000000UL, {1466355, -39575, 402} },
{1122000000UL, {1518771, -40865, 402} },
{1224000000UL, {1573009, -42145, 402} },
{1326000000UL, {1629068, -43435, 402} },
{1428000000UL, {1686950, -44715, 402} },
{1530000000UL, {1746653, -46005, 402} },
{1632000000UL, {1808179, -47285, 402} },
{1734000000UL, {1871526, -48575, 402} },
{1836000000UL, {1936696, -49855, 402} },
{1938000000UL, {2003687, -51145, 402} },
{2014500000UL, {2054787, -52095, 402} },
{2116500000UL, {2124957, -53385, 402} },
{2218500000UL, {2196950, -54665, 402} },
{2320500000UL, {2270765, -55955, 402} },
{2422500000UL, {2346401, -57235, 402} },
{2524500000UL, {2437299, -58535, 402} },
{0, { 0, 0, 0} },
},
.cpu_dfll_data = {
.tune0_low = 0x005020ff,
.tune0_high = 0x005040ff,
.tune1 = 0x00000060,
}
},
};
static int tegra124_dfll_fcpu_probe(struct platform_device *pdev)
{
int process_id, speedo_id, speedo_value;
struct tegra_dfll_soc_data *soc;
const struct cvb_table *cvb;
process_id = tegra_sku_info.cpu_process_id;
speedo_id = tegra_sku_info.cpu_speedo_id;
speedo_value = tegra_sku_info.cpu_speedo_value;
if (speedo_id >= ARRAY_SIZE(cpu_max_freq_table)) {
dev_err(&pdev->dev, "unknown max CPU freq for speedo_id=%d\n",
speedo_id);
return -ENODEV;
}
soc = devm_kzalloc(&pdev->dev, sizeof(*soc), GFP_KERNEL);
if (!soc)
return -ENOMEM;
soc->dev = get_cpu_device(0);
if (!soc->dev) {
dev_err(&pdev->dev, "no CPU0 device\n");
return -ENODEV;
}
cvb = tegra_cvb_build_opp_table(tegra124_cpu_cvb_tables,
ARRAY_SIZE(tegra124_cpu_cvb_tables),
process_id, speedo_id, speedo_value,
cpu_max_freq_table[speedo_id],
soc->dev);
if (IS_ERR(cvb)) {
dev_err(&pdev->dev, "couldn't build OPP table: %ld\n",
PTR_ERR(cvb));
return PTR_ERR(cvb);
}
soc->min_millivolts = cvb->min_millivolts;
soc->tune0_low = cvb->cpu_dfll_data.tune0_low;
soc->tune0_high = cvb->cpu_dfll_data.tune0_high;
soc->tune1 = cvb->cpu_dfll_data.tune1;
return tegra_dfll_register(pdev, soc);
}
static const struct of_device_id tegra124_dfll_fcpu_of_match[] = {
{ .compatible = "nvidia,tegra124-dfll", },
{ },
};
MODULE_DEVICE_TABLE(of, tegra124_dfll_fcpu_of_match);
static const struct dev_pm_ops tegra124_dfll_pm_ops = {
SET_RUNTIME_PM_OPS(tegra_dfll_runtime_suspend,
tegra_dfll_runtime_resume, NULL)
};
static struct platform_driver tegra124_dfll_fcpu_driver = {
.probe = tegra124_dfll_fcpu_probe,
.remove = tegra_dfll_unregister,
.driver = {
.name = "tegra124-dfll",
.of_match_table = tegra124_dfll_fcpu_of_match,
.pm = &tegra124_dfll_pm_ops,
},
};
static int __init tegra124_dfll_fcpu_init(void)
{
return platform_driver_register(&tegra124_dfll_fcpu_driver);
}
module_init(tegra124_dfll_fcpu_init);
static void __exit tegra124_dfll_fcpu_exit(void)
{
platform_driver_unregister(&tegra124_dfll_fcpu_driver);
}
module_exit(tegra124_dfll_fcpu_exit);
MODULE_DESCRIPTION("Tegra124 DFLL clock source driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Aleksandr Frid <afrid@nvidia.com>");
MODULE_AUTHOR("Paul Walmsley <pwalmsley@nvidia.com>");