summaryrefslogtreecommitdiffstats
path: root/drivers/thermal/broadcom/bcm2835_thermal.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/thermal/broadcom/bcm2835_thermal.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/thermal/broadcom/bcm2835_thermal.c')
-rw-r--r--drivers/thermal/broadcom/bcm2835_thermal.c307
1 files changed, 307 insertions, 0 deletions
diff --git a/drivers/thermal/broadcom/bcm2835_thermal.c b/drivers/thermal/broadcom/bcm2835_thermal.c
new file mode 100644
index 0000000000..3acc9288b3
--- /dev/null
+++ b/drivers/thermal/broadcom/bcm2835_thermal.c
@@ -0,0 +1,307 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Driver for Broadcom BCM2835 SoC temperature sensor
+ *
+ * Copyright (C) 2016 Martin Sperl
+ */
+
+#include <linux/clk.h>
+#include <linux/debugfs.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/thermal.h>
+
+#include "../thermal_hwmon.h"
+
+#define BCM2835_TS_TSENSCTL 0x00
+#define BCM2835_TS_TSENSSTAT 0x04
+
+#define BCM2835_TS_TSENSCTL_PRWDW BIT(0)
+#define BCM2835_TS_TSENSCTL_RSTB BIT(1)
+
+/*
+ * bandgap reference voltage in 6 mV increments
+ * 000b = 1178 mV, 001b = 1184 mV, ... 111b = 1220 mV
+ */
+#define BCM2835_TS_TSENSCTL_CTRL_BITS 3
+#define BCM2835_TS_TSENSCTL_CTRL_SHIFT 2
+#define BCM2835_TS_TSENSCTL_CTRL_MASK \
+ GENMASK(BCM2835_TS_TSENSCTL_CTRL_BITS + \
+ BCM2835_TS_TSENSCTL_CTRL_SHIFT - 1, \
+ BCM2835_TS_TSENSCTL_CTRL_SHIFT)
+#define BCM2835_TS_TSENSCTL_CTRL_DEFAULT 1
+#define BCM2835_TS_TSENSCTL_EN_INT BIT(5)
+#define BCM2835_TS_TSENSCTL_DIRECT BIT(6)
+#define BCM2835_TS_TSENSCTL_CLR_INT BIT(7)
+#define BCM2835_TS_TSENSCTL_THOLD_SHIFT 8
+#define BCM2835_TS_TSENSCTL_THOLD_BITS 10
+#define BCM2835_TS_TSENSCTL_THOLD_MASK \
+ GENMASK(BCM2835_TS_TSENSCTL_THOLD_BITS + \
+ BCM2835_TS_TSENSCTL_THOLD_SHIFT - 1, \
+ BCM2835_TS_TSENSCTL_THOLD_SHIFT)
+/*
+ * time how long the block to be asserted in reset
+ * which based on a clock counter (TSENS clock assumed)
+ */
+#define BCM2835_TS_TSENSCTL_RSTDELAY_SHIFT 18
+#define BCM2835_TS_TSENSCTL_RSTDELAY_BITS 8
+#define BCM2835_TS_TSENSCTL_REGULEN BIT(26)
+
+#define BCM2835_TS_TSENSSTAT_DATA_BITS 10
+#define BCM2835_TS_TSENSSTAT_DATA_SHIFT 0
+#define BCM2835_TS_TSENSSTAT_DATA_MASK \
+ GENMASK(BCM2835_TS_TSENSSTAT_DATA_BITS + \
+ BCM2835_TS_TSENSSTAT_DATA_SHIFT - 1, \
+ BCM2835_TS_TSENSSTAT_DATA_SHIFT)
+#define BCM2835_TS_TSENSSTAT_VALID BIT(10)
+#define BCM2835_TS_TSENSSTAT_INTERRUPT BIT(11)
+
+struct bcm2835_thermal_data {
+ struct thermal_zone_device *tz;
+ void __iomem *regs;
+ struct clk *clk;
+ struct dentry *debugfsdir;
+};
+
+static int bcm2835_thermal_adc2temp(u32 adc, int offset, int slope)
+{
+ return offset + slope * adc;
+}
+
+static int bcm2835_thermal_temp2adc(int temp, int offset, int slope)
+{
+ temp -= offset;
+ temp /= slope;
+
+ if (temp < 0)
+ temp = 0;
+ if (temp >= BIT(BCM2835_TS_TSENSSTAT_DATA_BITS))
+ temp = BIT(BCM2835_TS_TSENSSTAT_DATA_BITS) - 1;
+
+ return temp;
+}
+
+static int bcm2835_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
+{
+ struct bcm2835_thermal_data *data = thermal_zone_device_priv(tz);
+ u32 val = readl(data->regs + BCM2835_TS_TSENSSTAT);
+
+ if (!(val & BCM2835_TS_TSENSSTAT_VALID))
+ return -EIO;
+
+ val &= BCM2835_TS_TSENSSTAT_DATA_MASK;
+
+ *temp = bcm2835_thermal_adc2temp(
+ val,
+ thermal_zone_get_offset(data->tz),
+ thermal_zone_get_slope(data->tz));
+
+ return 0;
+}
+
+static const struct debugfs_reg32 bcm2835_thermal_regs[] = {
+ {
+ .name = "ctl",
+ .offset = 0
+ },
+ {
+ .name = "stat",
+ .offset = 4
+ }
+};
+
+static void bcm2835_thermal_debugfs(struct platform_device *pdev)
+{
+ struct bcm2835_thermal_data *data = platform_get_drvdata(pdev);
+ struct debugfs_regset32 *regset;
+
+ data->debugfsdir = debugfs_create_dir("bcm2835_thermal", NULL);
+
+ regset = devm_kzalloc(&pdev->dev, sizeof(*regset), GFP_KERNEL);
+ if (!regset)
+ return;
+
+ regset->regs = bcm2835_thermal_regs;
+ regset->nregs = ARRAY_SIZE(bcm2835_thermal_regs);
+ regset->base = data->regs;
+
+ debugfs_create_regset32("regset", 0444, data->debugfsdir, regset);
+}
+
+static const struct thermal_zone_device_ops bcm2835_thermal_ops = {
+ .get_temp = bcm2835_thermal_get_temp,
+};
+
+/*
+ * Note: as per Raspberry Foundation FAQ
+ * (https://www.raspberrypi.org/help/faqs/#performanceOperatingTemperature)
+ * the recommended temperature range for the SoC -40C to +85C
+ * so the trip limit is set to 80C.
+ * this applies to all the BCM283X SoC
+ */
+
+static const struct of_device_id bcm2835_thermal_of_match_table[] = {
+ {
+ .compatible = "brcm,bcm2835-thermal",
+ },
+ {
+ .compatible = "brcm,bcm2836-thermal",
+ },
+ {
+ .compatible = "brcm,bcm2837-thermal",
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, bcm2835_thermal_of_match_table);
+
+static int bcm2835_thermal_probe(struct platform_device *pdev)
+{
+ const struct of_device_id *match;
+ struct thermal_zone_device *tz;
+ struct bcm2835_thermal_data *data;
+ int err = 0;
+ u32 val;
+ unsigned long rate;
+
+ data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ match = of_match_device(bcm2835_thermal_of_match_table,
+ &pdev->dev);
+ if (!match)
+ return -EINVAL;
+
+ data->regs = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
+ if (IS_ERR(data->regs)) {
+ err = PTR_ERR(data->regs);
+ return err;
+ }
+
+ data->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(data->clk)) {
+ err = PTR_ERR(data->clk);
+ if (err != -EPROBE_DEFER)
+ dev_err(&pdev->dev, "Could not get clk: %d\n", err);
+ return err;
+ }
+
+ err = clk_prepare_enable(data->clk);
+ if (err)
+ return err;
+
+ rate = clk_get_rate(data->clk);
+ if ((rate < 1920000) || (rate > 5000000))
+ dev_warn(&pdev->dev,
+ "Clock %pCn running at %lu Hz is outside of the recommended range: 1.92 to 5MHz\n",
+ data->clk, rate);
+
+ /* register of thermal sensor and get info from DT */
+ tz = devm_thermal_of_zone_register(&pdev->dev, 0, data,
+ &bcm2835_thermal_ops);
+ if (IS_ERR(tz)) {
+ err = PTR_ERR(tz);
+ dev_err(&pdev->dev,
+ "Failed to register the thermal device: %d\n",
+ err);
+ goto err_clk;
+ }
+
+ /*
+ * right now the FW does set up the HW-block, so we are not
+ * touching the configuration registers.
+ * But if the HW is not enabled, then set it up
+ * using "sane" values used by the firmware right now.
+ */
+ val = readl(data->regs + BCM2835_TS_TSENSCTL);
+ if (!(val & BCM2835_TS_TSENSCTL_RSTB)) {
+ struct thermal_trip trip;
+ int offset, slope;
+
+ slope = thermal_zone_get_slope(tz);
+ offset = thermal_zone_get_offset(tz);
+ /*
+ * For now we deal only with critical, otherwise
+ * would need to iterate
+ */
+ err = thermal_zone_get_trip(tz, 0, &trip);
+ if (err < 0) {
+ dev_err(&pdev->dev,
+ "Not able to read trip_temp: %d\n",
+ err);
+ goto err_tz;
+ }
+
+ /* set bandgap reference voltage and enable voltage regulator */
+ val = (BCM2835_TS_TSENSCTL_CTRL_DEFAULT <<
+ BCM2835_TS_TSENSCTL_CTRL_SHIFT) |
+ BCM2835_TS_TSENSCTL_REGULEN;
+
+ /* use the recommended reset duration */
+ val |= (0xFE << BCM2835_TS_TSENSCTL_RSTDELAY_SHIFT);
+
+ /* trip_adc value from info */
+ val |= bcm2835_thermal_temp2adc(trip.temperature,
+ offset,
+ slope)
+ << BCM2835_TS_TSENSCTL_THOLD_SHIFT;
+
+ /* write the value back to the register as 2 steps */
+ writel(val, data->regs + BCM2835_TS_TSENSCTL);
+ val |= BCM2835_TS_TSENSCTL_RSTB;
+ writel(val, data->regs + BCM2835_TS_TSENSCTL);
+ }
+
+ data->tz = tz;
+
+ platform_set_drvdata(pdev, data);
+
+ /*
+ * Thermal_zone doesn't enable hwmon as default,
+ * enable it here
+ */
+ err = thermal_add_hwmon_sysfs(tz);
+ if (err)
+ goto err_tz;
+
+ bcm2835_thermal_debugfs(pdev);
+
+ return 0;
+err_tz:
+ devm_thermal_of_zone_unregister(&pdev->dev, tz);
+err_clk:
+ clk_disable_unprepare(data->clk);
+
+ return err;
+}
+
+static int bcm2835_thermal_remove(struct platform_device *pdev)
+{
+ struct bcm2835_thermal_data *data = platform_get_drvdata(pdev);
+
+ debugfs_remove_recursive(data->debugfsdir);
+ clk_disable_unprepare(data->clk);
+
+ return 0;
+}
+
+static struct platform_driver bcm2835_thermal_driver = {
+ .probe = bcm2835_thermal_probe,
+ .remove = bcm2835_thermal_remove,
+ .driver = {
+ .name = "bcm2835_thermal",
+ .of_match_table = bcm2835_thermal_of_match_table,
+ },
+};
+module_platform_driver(bcm2835_thermal_driver);
+
+MODULE_AUTHOR("Martin Sperl");
+MODULE_DESCRIPTION("Thermal driver for bcm2835 chip");
+MODULE_LICENSE("GPL");