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authorTuomas Tynkkynen <ttynkkynen@nvidia.com>2015-05-13 17:58:41 +0300
committerThierry Reding <treding@nvidia.com>2015-07-16 10:39:45 +0200
commit62a8a094b0e1de782a1b3dcb5e42a7d44379e583 (patch)
tree354de9066b07a1c4c3eb0fb7f727023b1a57b860 /drivers/clk/tegra
parenta3c83ff20c64a0ea3580aa7ed2953ff1602334dd (diff)
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clk: tegra: Add Tegra124 DFLL clocksource platform driver
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 <ttynkkynen@nvidia.com> Signed-off-by: Mikko Perttunen <mikko.perttunen@kapsi.fi> Acked-by: Michael Turquette <mturquette@linaro.org> [treding@nvidia.com: move setup code into ->probe()] Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'drivers/clk/tegra')
-rw-r--r--drivers/clk/tegra/Makefile2
-rw-r--r--drivers/clk/tegra/clk-dfll.c6
-rw-r--r--drivers/clk/tegra/clk-dfll.h2
-rw-r--r--drivers/clk/tegra/clk-tegra124-dfll-fcpu.c166
4 files changed, 172 insertions, 4 deletions
diff --git a/drivers/clk/tegra/Makefile b/drivers/clk/tegra/Makefile
index ec2e5163e1ae..826c325dc2e8 100644
--- a/drivers/clk/tegra/Makefile
+++ b/drivers/clk/tegra/Makefile
@@ -17,4 +17,6 @@ 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-$(CONFIG_ARCH_TEGRA_124_SOC) += clk-tegra124-dfll-fcpu.o
obj-$(CONFIG_ARCH_TEGRA_132_SOC) += clk-tegra124.o
+obj-y += cvb.o
diff --git a/drivers/clk/tegra/clk-dfll.c b/drivers/clk/tegra/clk-dfll.c
index 6ec645776897..109a79b95238 100644
--- a/drivers/clk/tegra/clk-dfll.c
+++ b/drivers/clk/tegra/clk-dfll.c
@@ -682,7 +682,7 @@ static int find_lut_index_for_rate(struct tegra_dfll *td, unsigned long rate)
struct dev_pm_opp *opp;
int i, uv;
- opp = dev_pm_opp_find_freq_ceil(td->soc->opp_dev, &rate);
+ opp = dev_pm_opp_find_freq_ceil(td->soc->dev, &rate);
if (IS_ERR(opp))
return PTR_ERR(opp);
uv = dev_pm_opp_get_voltage(opp);
@@ -1436,7 +1436,7 @@ static int dfll_build_i2c_lut(struct tegra_dfll *td)
rcu_read_lock();
rate = ULONG_MAX;
- opp = dev_pm_opp_find_freq_floor(td->soc->opp_dev, &rate);
+ opp = dev_pm_opp_find_freq_floor(td->soc->dev, &rate);
if (IS_ERR(opp)) {
dev_err(td->dev, "couldn't get vmax opp, empty opp table?\n");
goto out;
@@ -1449,7 +1449,7 @@ static int dfll_build_i2c_lut(struct tegra_dfll *td)
goto out;
for (j = 1, rate = 0; ; rate++) {
- opp = dev_pm_opp_find_freq_ceil(td->soc->opp_dev, &rate);
+ opp = dev_pm_opp_find_freq_ceil(td->soc->dev, &rate);
if (IS_ERR(opp))
break;
v_opp = dev_pm_opp_get_voltage(opp);
diff --git a/drivers/clk/tegra/clk-dfll.h b/drivers/clk/tegra/clk-dfll.h
index b5d1fd47684e..2e4c0772a5dc 100644
--- a/drivers/clk/tegra/clk-dfll.h
+++ b/drivers/clk/tegra/clk-dfll.h
@@ -35,7 +35,7 @@
* @set_clock_trimmers_low: fn ptr to tune clock trimmers for low voltage
*/
struct tegra_dfll_soc_data {
- struct device *opp_dev;
+ struct device *dev;
unsigned int min_millivolts;
u32 tune0_low;
u32 tune0_high;
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 000000000000..61253330c12b
--- /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>");