target/linux/generic/patches-4.9/081-0002-thermal-broadcom-add-Northstar-thermal-driver.patch

   1 From a94cb7eeecc4104a6874339f90c5d0647359c102 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
   3 Date: Mon, 3 Apr 2017 17:48:29 +0200
   4 Subject: [PATCH] thermal: broadcom: add Northstar thermal driver
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 Northstar is a SoC family commonly used in home routers. This commit
  10 adds a driver for checking CPU temperature. As Northstar Plus seems to
  11 also have this IP block this new symbol gets ARCH_BCM_IPROC dependency.
  12
  13 Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
  14 Signed-off-by: Jon Mason <jon.mason@broadcom.com>
  15 Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
  16 ---
  17  drivers/thermal/Kconfig               |   5 ++
  18  drivers/thermal/Makefile              |   1 +
  19  drivers/thermal/broadcom/Kconfig      |   8 +++
  20  drivers/thermal/broadcom/Makefile     |   1 +
  21  drivers/thermal/broadcom/ns-thermal.c | 105 ++++++++++++++++++++++++++++++++++
  22  5 files changed, 120 insertions(+)
  23  create mode 100644 drivers/thermal/broadcom/Kconfig
  24  create mode 100644 drivers/thermal/broadcom/Makefile
  25  create mode 100644 drivers/thermal/broadcom/ns-thermal.c
  26
  27 --- a/drivers/thermal/Kconfig
  28 +++ b/drivers/thermal/Kconfig
  29 @@ -381,6 +381,11 @@ config MTK_THERMAL
  30           Enable this option if you want to have support for thermal management
  31           controller present in Mediatek SoCs
  32
  33 +menu "Broadcom thermal drivers"
  34 +depends on ARCH_BCM || COMPILE_TEST
  35 +source "drivers/thermal/broadcom/Kconfig"
  36 +endmenu
  37 +
  38  menu "Texas Instruments thermal drivers"
  39  depends on ARCH_HAS_BANDGAP || COMPILE_TEST
  40  depends on HAS_IOMEM
  41 --- a/drivers/thermal/Makefile
  42 +++ b/drivers/thermal/Makefile
  43 @@ -26,6 +26,7 @@ thermal_sys-$(CONFIG_CLOCK_THERMAL)   += c
  44  thermal_sys-$(CONFIG_DEVFREQ_THERMAL) += devfreq_cooling.o
  45
  46  # platform thermal drivers
  47 +obj-y                          += broadcom/
  48  obj-$(CONFIG_QCOM_SPMI_TEMP_ALARM)     += qcom-spmi-temp-alarm.o
  49  obj-$(CONFIG_SPEAR_THERMAL)    += spear_thermal.o
  50  obj-$(CONFIG_ROCKCHIP_THERMAL) += rockchip_thermal.o
  51 --- /dev/null
  52 +++ b/drivers/thermal/broadcom/Kconfig
  53 @@ -0,0 +1,8 @@
  54 +config BCM_NS_THERMAL
  55 +       tristate "Northstar thermal driver"
  56 +       depends on ARCH_BCM_IPROC || COMPILE_TEST
  57 +       help
  58 +         Northstar is a family of SoCs that includes e.g. BCM4708, BCM47081,
  59 +         BCM4709 and BCM47094. It contains DMU (Device Management Unit) block
  60 +         with a thermal sensor that allows checking CPU temperature. This
  61 +         driver provides support for it.
  62 --- /dev/null
  63 +++ b/drivers/thermal/broadcom/Makefile
  64 @@ -0,0 +1 @@
  65 +obj-$(CONFIG_BCM_NS_THERMAL)           += ns-thermal.o
  66 --- /dev/null
  67 +++ b/drivers/thermal/broadcom/ns-thermal.c
  68 @@ -0,0 +1,105 @@
  69 +/*
  70 + * Copyright (C) 2017 Rafał Miłecki <rafal@milecki.pl>
  71 + *
  72 + * This program is free software; you can redistribute it and/or modify
  73 + * it under the terms of the GNU General Public License version 2 as
  74 + * published by the Free Software Foundation.
  75 + */
  76 +
  77 +#include <linux/module.h>
  78 +#include <linux/of_address.h>
  79 +#include <linux/platform_device.h>
  80 +#include <linux/thermal.h>
  81 +
  82 +#define PVTMON_CONTROL0                                        0x00
  83 +#define PVTMON_CONTROL0_SEL_MASK                       0x0000000e
  84 +#define PVTMON_CONTROL0_SEL_TEMP_MONITOR               0x00000000
  85 +#define PVTMON_CONTROL0_SEL_TEST_MODE                  0x0000000e
  86 +#define PVTMON_STATUS                                  0x08
  87 +
  88 +struct ns_thermal {
  89 +       struct thermal_zone_device *tz;
  90 +       void __iomem *pvtmon;
  91 +};
  92 +
  93 +static int ns_thermal_get_temp(void *data, int *temp)
  94 +{
  95 +       struct ns_thermal *ns_thermal = data;
  96 +       int offset = thermal_zone_get_offset(ns_thermal->tz);
  97 +       int slope = thermal_zone_get_slope(ns_thermal->tz);
  98 +       u32 val;
  99 +
 100 +       val = readl(ns_thermal->pvtmon + PVTMON_CONTROL0);
 101 +       if ((val & PVTMON_CONTROL0_SEL_MASK) != PVTMON_CONTROL0_SEL_TEMP_MONITOR) {
 102 +               /* Clear current mode selection */
 103 +               val &= ~PVTMON_CONTROL0_SEL_MASK;
 104 +
 105 +               /* Set temp monitor mode (it's the default actually) */
 106 +               val |= PVTMON_CONTROL0_SEL_TEMP_MONITOR;
 107 +
 108 +               writel(val, ns_thermal->pvtmon + PVTMON_CONTROL0);
 109 +       }
 110 +
 111 +       val = readl(ns_thermal->pvtmon + PVTMON_STATUS);
 112 +       *temp = slope * val + offset;
 113 +
 114 +       return 0;
 115 +}
 116 +
 117 +static const struct thermal_zone_of_device_ops ns_thermal_ops = {
 118 +       .get_temp = ns_thermal_get_temp,
 119 +};
 120 +
 121 +static int ns_thermal_probe(struct platform_device *pdev)
 122 +{
 123 +       struct device *dev = &pdev->dev;
 124 +       struct ns_thermal *ns_thermal;
 125 +
 126 +       ns_thermal = devm_kzalloc(dev, sizeof(*ns_thermal), GFP_KERNEL);
 127 +       if (!ns_thermal)
 128 +               return -ENOMEM;
 129 +
 130 +       ns_thermal->pvtmon = of_iomap(dev_of_node(dev), 0);
 131 +       if (WARN_ON(!ns_thermal->pvtmon))
 132 +               return -ENOENT;
 133 +
 134 +       ns_thermal->tz = devm_thermal_zone_of_sensor_register(dev, 0,
 135 +                                                             ns_thermal,
 136 +                                                             &ns_thermal_ops);
 137 +       if (IS_ERR(ns_thermal->tz)) {
 138 +               iounmap(ns_thermal->pvtmon);
 139 +               return PTR_ERR(ns_thermal->tz);
 140 +       }
 141 +
 142 +       platform_set_drvdata(pdev, ns_thermal);
 143 +
 144 +       return 0;
 145 +}
 146 +
 147 +static int ns_thermal_remove(struct platform_device *pdev)
 148 +{
 149 +       struct ns_thermal *ns_thermal = platform_get_drvdata(pdev);
 150 +
 151 +       iounmap(ns_thermal->pvtmon);
 152 +
 153 +       return 0;
 154 +}
 155 +
 156 +static const struct of_device_id ns_thermal_of_match[] = {
 157 +       { .compatible = "brcm,ns-thermal", },
 158 +       {},
 159 +};
 160 +MODULE_DEVICE_TABLE(of, ns_thermal_of_match);
 161 +
 162 +static struct platform_driver ns_thermal_driver = {
 163 +       .probe          = ns_thermal_probe,
 164 +       .remove         = ns_thermal_remove,
 165 +       .driver = {
 166 +               .name = "ns-thermal",
 167 +               .of_match_table = ns_thermal_of_match,
 168 +       },
 169 +};
 170 +module_platform_driver(ns_thermal_driver);
 171 +
 172 +MODULE_DESCRIPTION("Northstar thermal driver");
 173 +MODULE_LICENSE("GPL v2");