[PATCH 06/13] clk: tegra: Add Tegra124 DFLL clocksource platform driver
From: Tuomas Tynkkynen <hidden>
Date: 2014-07-10 21:43:40
Also in:
linux-devicetree, linux-pm, linux-tegra, lkml
Subsystem:
common clk framework, tegra clock driver, the rest · Maintainers:
Michael Turquette, Stephen Boyd, Peter De Schrijver, Prashant Gaikwad, Linus Torvalds
Add basic platform driver support for the fast CPU cluster DFLL clocksource found on Tegra124 SoCs. This small driver selects the appropriate Tegra124-specific characterization data and integration code. It relies on the DFLL common code to do most of the work. Signed-off-by: Tuomas Tynkkynen <redacted> --- drivers/clk/tegra/Makefile | 2 + drivers/clk/tegra/clk-tegra124-dfll-fcpu.c | 156 +++++++++++++++++++++++++++++ 2 files changed, 158 insertions(+) create mode 100644 drivers/clk/tegra/clk-tegra124-dfll-fcpu.c
diff --git a/drivers/clk/tegra/Makefile b/drivers/clk/tegra/Makefile
index 47320ca..2f87188 100644
--- a/drivers/clk/tegra/Makefile
+++ b/drivers/clk/tegra/Makefile@@ -16,3 +16,5 @@ obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += clk-tegra20.o obj-$(CONFIG_ARCH_TEGRA_3x_SOC) += clk-tegra30.o obj-$(CONFIG_ARCH_TEGRA_114_SOC) += clk-tegra114.o obj-$(CONFIG_ARCH_TEGRA_124_SOC) += clk-tegra124.o +obj-$(CONFIG_ARCH_TEGRA_124_SOC) += clk-tegra124-dfll-fcpu.o +obj-y += cvb.o
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 0000000..58512d5
--- /dev/null
+++ b/drivers/clk/tegra/clk-tegra124-dfll-fcpu.c@@ -0,0 +1,156 @@ +/* + * 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 <linux/tegra-soc.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 struct tegra_dfll_soc_data soc = { + .assert_dvco_reset = tegra124_clock_assert_dfll_dvco_reset, + .deassert_dvco_reset = tegra124_clock_deassert_dfll_dvco_reset, +}; + +static int tegra124_dfll_fcpu_probe(struct platform_device *pdev) +{ + int process_id, speedo_id, speedo_value; + 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.opp_dev = get_cpu_device(0); + if (!soc.opp_dev) { + dev_err(&pdev->dev, "no CPU0 device"); + 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.opp_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 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", + .owner = THIS_MODULE, + .of_match_table = tegra124_dfll_fcpu_of_match, + .pm = &tegra124_dfll_pm_ops, + }, +}; +module_platform_driver(tegra124_dfll_fcpu_driver); + +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>");
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1.8.1.5