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..edc31bb56 --- /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/init.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, + .entries = { + { 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 } }, + { 0UL, { 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, err; + struct tegra_dfll_soc_data *soc; + + 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; + } + + soc->max_freq = cpu_max_freq_table[speedo_id]; + + soc->cvb = tegra_cvb_add_opp_table(soc->dev, tegra124_cpu_cvb_tables, + ARRAY_SIZE(tegra124_cpu_cvb_tables), + process_id, speedo_id, speedo_value, + soc->max_freq); + if (IS_ERR(soc->cvb)) { + dev_err(&pdev->dev, "couldn't add OPP table: %ld\n", + PTR_ERR(soc->cvb)); + return PTR_ERR(soc->cvb); + } + + err = tegra_dfll_register(pdev, soc); + if (err < 0) { + tegra_cvb_remove_opp_table(soc->dev, soc->cvb, soc->max_freq); + return err; + } + + return 0; +} + +static int tegra124_dfll_fcpu_remove(struct platform_device *pdev) +{ + struct tegra_dfll_soc_data *soc; + + soc = tegra_dfll_unregister(pdev); + if (IS_ERR(soc)) { + dev_err(&pdev->dev, "failed to unregister DFLL: %ld\n", + PTR_ERR(soc)); + return PTR_ERR(soc); + } + + tegra_cvb_remove_opp_table(soc->dev, soc->cvb, soc->max_freq); + + return 0; +} + +static const struct of_device_id tegra124_dfll_fcpu_of_match[] = { + { .compatible = "nvidia,tegra124-dfll", }, + { }, +}; + +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 = tegra124_dfll_fcpu_remove, + .driver = { + .name = "tegra124-dfll", + .of_match_table = tegra124_dfll_fcpu_of_match, + .pm = &tegra124_dfll_pm_ops, + }, +}; +builtin_platform_driver(tegra124_dfll_fcpu_driver); |