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>

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>");