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7d7aa2fd92
This change makes the names of Broadcom targets consistent by using the common notation based on SoC/CPU ID (which is used internally anyway), bcmXXXX instead of brcmXXXX. This is even used for target TITLE in make menuconfig already, only the short target name used brcm so far. Despite, since subtargets range from bcm2708 to bcm2711, it seems appropriate to use bcm27xx instead of bcm2708 (again, as already done for BOARDNAME). This also renames the packages brcm2708-userland and brcm2708-gpu-fw. Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de> Acked-by: Álvaro Fernández Rojas <noltari@gmail.com>
162 lines
4.8 KiB
Diff
162 lines
4.8 KiB
Diff
From 1c0d3626312369837bc18051ed6c9611323fce87 Mon Sep 17 00:00:00 2001
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From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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Date: Wed, 12 Jun 2019 20:24:56 +0200
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Subject: [PATCH] cpufreq: add driver for Raspberry Pi
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Commit d3df18a97e586702920337056540267807b23f8e upstream.
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Raspberry Pi's firmware offers and interface though which update it's
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performance requirements. It allows us to request for specific runtime
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frequencies, which the firmware might or might not respect, depending on
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the firmware configuration and thermals.
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As the maximum and minimum frequencies are configurable in the firmware
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there is no way to know in advance their values. So the Raspberry Pi
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cpufreq driver queries them, builds an opp frequency table to then
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launch cpufreq-dt.
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Also, as the firmware interface might be configured as a module, making
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the cpu clock unavailable during init, this implements a full fledged
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driver, as opposed to most drivers registering cpufreq-dt, which only
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make use of an init routine.
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Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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Acked-by: Eric Anholt <eric@anholt.net>
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Reviewed-by: Stephen Boyd <sboyd@kernel.org>
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Acked-by: Stefan Wahren <stefan.wahren@i2se.com>
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Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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---
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drivers/cpufreq/Kconfig.arm | 8 +++
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drivers/cpufreq/Makefile | 1 +
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drivers/cpufreq/raspberrypi-cpufreq.c | 97 +++++++++++++++++++++++++++
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3 files changed, 106 insertions(+)
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create mode 100644 drivers/cpufreq/raspberrypi-cpufreq.c
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--- a/drivers/cpufreq/Kconfig.arm
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+++ b/drivers/cpufreq/Kconfig.arm
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@@ -121,6 +121,14 @@ config ARM_QCOM_CPUFREQ_KRYO
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If in doubt, say N.
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+config ARM_RASPBERRYPI_CPUFREQ
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+ tristate "Raspberry Pi cpufreq support"
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+ depends on CLK_RASPBERRYPI || COMPILE_TEST
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+ help
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+ This adds the CPUFreq driver for Raspberry Pi
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+
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+ If in doubt, say N.
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+
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config ARM_S3C_CPUFREQ
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bool
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help
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--- a/drivers/cpufreq/Makefile
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+++ b/drivers/cpufreq/Makefile
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@@ -65,6 +65,7 @@ obj-$(CONFIG_ARM_OMAP2PLUS_CPUFREQ) += o
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obj-$(CONFIG_ARM_PXA2xx_CPUFREQ) += pxa2xx-cpufreq.o
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obj-$(CONFIG_PXA3xx) += pxa3xx-cpufreq.o
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obj-$(CONFIG_ARM_QCOM_CPUFREQ_KRYO) += qcom-cpufreq-kryo.o
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+obj-$(CONFIG_ARM_RASPBERRYPI_CPUFREQ) += raspberrypi-cpufreq.o
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obj-$(CONFIG_ARM_S3C2410_CPUFREQ) += s3c2410-cpufreq.o
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obj-$(CONFIG_ARM_S3C2412_CPUFREQ) += s3c2412-cpufreq.o
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obj-$(CONFIG_ARM_S3C2416_CPUFREQ) += s3c2416-cpufreq.o
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--- /dev/null
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+++ b/drivers/cpufreq/raspberrypi-cpufreq.c
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@@ -0,0 +1,97 @@
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+// SPDX-License-Identifier: GPL-2.0
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+/*
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+ * Raspberry Pi cpufreq driver
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+ *
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+ * Copyright (C) 2019, Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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+ */
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+
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+#include <linux/clk.h>
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+#include <linux/cpu.h>
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+#include <linux/cpufreq.h>
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+#include <linux/module.h>
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+#include <linux/platform_device.h>
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+#include <linux/pm_opp.h>
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+
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+#define RASPBERRYPI_FREQ_INTERVAL 100000000
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+
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+static struct platform_device *cpufreq_dt;
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+
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+static int raspberrypi_cpufreq_probe(struct platform_device *pdev)
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+{
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+ struct device *cpu_dev;
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+ unsigned long min, max;
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+ unsigned long rate;
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+ struct clk *clk;
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+ int ret;
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+
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+ cpu_dev = get_cpu_device(0);
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+ if (!cpu_dev) {
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+ pr_err("Cannot get CPU for cpufreq driver\n");
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+ return -ENODEV;
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+ }
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+
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+ clk = clk_get(cpu_dev, NULL);
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+ if (IS_ERR(clk)) {
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+ dev_err(cpu_dev, "Cannot get clock for CPU0\n");
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+ return PTR_ERR(clk);
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+ }
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+
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+ /*
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+ * The max and min frequencies are configurable in the Raspberry Pi
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+ * firmware, so we query them at runtime.
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+ */
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+ min = roundup(clk_round_rate(clk, 0), RASPBERRYPI_FREQ_INTERVAL);
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+ max = roundup(clk_round_rate(clk, ULONG_MAX), RASPBERRYPI_FREQ_INTERVAL);
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+ clk_put(clk);
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+
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+ for (rate = min; rate <= max; rate += RASPBERRYPI_FREQ_INTERVAL) {
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+ ret = dev_pm_opp_add(cpu_dev, rate, 0);
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+ if (ret)
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+ goto remove_opp;
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+ }
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+
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+ cpufreq_dt = platform_device_register_simple("cpufreq-dt", -1, NULL, 0);
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+ ret = PTR_ERR_OR_ZERO(cpufreq_dt);
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+ if (ret) {
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+ dev_err(cpu_dev, "Failed to create platform device, %d\n", ret);
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+ goto remove_opp;
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+ }
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+
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+ return 0;
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+
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+remove_opp:
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+ dev_pm_opp_remove_all_dynamic(cpu_dev);
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+
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+ return ret;
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+}
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+
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+static int raspberrypi_cpufreq_remove(struct platform_device *pdev)
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+{
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+ struct device *cpu_dev;
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+
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+ cpu_dev = get_cpu_device(0);
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+ if (cpu_dev)
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+ dev_pm_opp_remove_all_dynamic(cpu_dev);
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+
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+ platform_device_unregister(cpufreq_dt);
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+
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+ return 0;
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+}
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+
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+/*
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+ * Since the driver depends on clk-raspberrypi, which may return EPROBE_DEFER,
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+ * all the activity is performed in the probe, which may be defered as well.
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+ */
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+static struct platform_driver raspberrypi_cpufreq_driver = {
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+ .driver = {
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+ .name = "raspberrypi-cpufreq",
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+ },
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+ .probe = raspberrypi_cpufreq_probe,
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+ .remove = raspberrypi_cpufreq_remove,
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+};
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+module_platform_driver(raspberrypi_cpufreq_driver);
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+
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+MODULE_AUTHOR("Nicolas Saenz Julienne <nsaenzjulienne@suse.de");
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+MODULE_DESCRIPTION("Raspberry Pi cpufreq driver");
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+MODULE_LICENSE("GPL");
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+MODULE_ALIAS("platform:raspberrypi-cpufreq");
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