diff options
Diffstat (limited to 'drivers/clk/tegra/clk-tegra124-dfll-fcpu.c')
| -rw-r--r-- | drivers/clk/tegra/clk-tegra124-dfll-fcpu.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/drivers/clk/tegra/clk-tegra124-dfll-fcpu.c b/drivers/clk/tegra/clk-tegra124-dfll-fcpu.c new file mode 100644 index 000000000..61253330c --- /dev/null +++ b/drivers/clk/tegra/clk-tegra124-dfll-fcpu.c @@ -0,0 +1,166 @@ +/* + * 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>"); |