target/linux/brcm2708/patches-4.1/0018-Added-hwmon-thermal-driver-for-reporting-core-temper.patch

   1 From 40d8a3f8af68f312479b38b0e704b4fe57c97f4c Mon Sep 17 00:00:00 2001
   2 From: popcornmix <popcornmix@gmail.com>
   3 Date: Tue, 26 Mar 2013 19:24:24 +0000
   4 Subject: [PATCH 018/148] Added hwmon/thermal driver for reporting core
   5  temperature. Thanks Dorian
   6 MIME-Version: 1.0
   7 Content-Type: text/plain; charset=UTF-8
   8 Content-Transfer-Encoding: 8bit
   9
  10 BCM270x: Move thermal sensor to Device Tree
  11
  12 Add Device Tree support to bcm2835-thermal driver.
  13 Add thermal sensor device to Device Tree.
  14 Don't add platform device when booting in DT mode.
  15
  16 Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
  17 ---
  18  arch/arm/mach-bcm2708/bcm2708.c   |   6 ++
  19  arch/arm/mach-bcm2709/bcm2709.c   |   6 ++
  20  drivers/thermal/Kconfig           |   7 ++
  21  drivers/thermal/Makefile          |   1 +
  22  drivers/thermal/bcm2835-thermal.c | 190 ++++++++++++++++++++++++++++++++++++++
  23  5 files changed, 210 insertions(+)
  24  create mode 100644 drivers/thermal/bcm2835-thermal.c
  25
  26 --- a/arch/arm/mach-bcm2708/bcm2708.c
  27 +++ b/arch/arm/mach-bcm2708/bcm2708.c
  28 @@ -505,6 +505,10 @@ static struct platform_device bcm2708_al
  29                },
  30  };
  31
  32 +static struct platform_device bcm2835_thermal_device = {
  33 +       .name = "bcm2835_thermal",
  34 +};
  35 +
  36  int __init bcm_register_device(struct platform_device *pdev)
  37  {
  38         int ret;
  39 @@ -651,6 +655,8 @@ void __init bcm2708_init(void)
  40         for (i = 0; i < ARRAY_SIZE(bcm2708_alsa_devices); i++)
  41                 bcm_register_device_dt(&bcm2708_alsa_devices[i]);
  42
  43 +       bcm_register_device_dt(&bcm2835_thermal_device);
  44 +
  45         if (!use_dt) {
  46                 for (i = 0; i < ARRAY_SIZE(amba_devs); i++) {
  47                         struct amba_device *d = amba_devs[i];
  48 --- a/arch/arm/mach-bcm2709/bcm2709.c
  49 +++ b/arch/arm/mach-bcm2709/bcm2709.c
  50 @@ -525,6 +525,10 @@ static struct platform_device bcm2708_al
  51                },
  52  };
  53
  54 +static struct platform_device bcm2835_thermal_device = {
  55 +       .name = "bcm2835_thermal",
  56 +};
  57 +
  58  int __init bcm_register_device(struct platform_device *pdev)
  59  {
  60         int ret;
  61 @@ -671,6 +675,8 @@ void __init bcm2709_init(void)
  62         for (i = 0; i < ARRAY_SIZE(bcm2708_alsa_devices); i++)
  63                 bcm_register_device_dt(&bcm2708_alsa_devices[i]);
  64
  65 +       bcm_register_device_dt(&bcm2835_thermal_device);
  66 +
  67         if (!use_dt) {
  68                 for (i = 0; i < ARRAY_SIZE(amba_devs); i++) {
  69                         struct amba_device *d = amba_devs[i];
  70 --- a/drivers/thermal/Kconfig
  71 +++ b/drivers/thermal/Kconfig
  72 @@ -238,6 +238,13 @@ config INTEL_POWERCLAMP
  73           enforce idle time which results in more package C-state residency. The
  74           user interface is exposed via generic thermal framework.
  75
  76 +config THERMAL_BCM2835
  77 +       depends on BCM2708_MBOX
  78 +       tristate "BCM2835 Thermal Driver"
  79 +       help
  80 +         This will enable temperature monitoring for the Broadcom BCM2835
  81 +         chip. If built as a module, it will be called 'bcm2835-thermal'.
  82 +
  83  config X86_PKG_TEMP_THERMAL
  84         tristate "X86 package temperature thermal driver"
  85         depends on X86_THERMAL_VECTOR
  86 --- a/drivers/thermal/Makefile
  87 +++ b/drivers/thermal/Makefile
  88 @@ -33,6 +33,7 @@ obj-$(CONFIG_ARMADA_THERMAL)  += armada_t
  89  obj-$(CONFIG_IMX_THERMAL)      += imx_thermal.o
  90  obj-$(CONFIG_DB8500_CPUFREQ_COOLING)   += db8500_cpufreq_cooling.o
  91  obj-$(CONFIG_INTEL_POWERCLAMP) += intel_powerclamp.o
  92 +obj-$(CONFIG_THERMAL_BCM2835)  += bcm2835-thermal.o
  93  obj-$(CONFIG_X86_PKG_TEMP_THERMAL)     += x86_pkg_temp_thermal.o
  94  obj-$(CONFIG_INTEL_SOC_DTS_THERMAL)    += intel_soc_dts_thermal.o
  95  obj-$(CONFIG_TI_SOC_THERMAL)   += ti-soc-thermal/
  96 --- /dev/null
  97 +++ b/drivers/thermal/bcm2835-thermal.c
  98 @@ -0,0 +1,190 @@
  99 +/*****************************************************************************
 100 +* Copyright 2011 Broadcom Corporation.  All rights reserved.
 101 +*
 102 +* Unless you and Broadcom execute a separate written software license
 103 +* agreement governing use of this software, this software is licensed to you
 104 +* under the terms of the GNU General Public License version 2, available at
 105 +* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
 106 +*
 107 +* Notwithstanding the above, under no circumstances may you combine this
 108 +* software in any way with any other Broadcom software provided under a
 109 +* license other than the GPL, without Broadcom's express prior written
 110 +* consent.
 111 +*****************************************************************************/
 112 +
 113 +#include <linux/kernel.h>
 114 +#include <linux/module.h>
 115 +#include <linux/init.h>
 116 +#include <linux/platform_data/mailbox-bcm2708.h>
 117 +#include <linux/platform_device.h>
 118 +#include <linux/slab.h>
 119 +#include <linux/sysfs.h>
 120 +#include <linux/thermal.h>
 121 +
 122 +
 123 +/* --- DEFINITIONS --- */
 124 +#define MODULE_NAME "bcm2835_thermal"
 125 +
 126 +/*#define THERMAL_DEBUG_ENABLE*/
 127 +
 128 +#ifdef THERMAL_DEBUG_ENABLE
 129 +#define print_debug(fmt,...) printk(KERN_INFO "%s:%s:%d: "fmt"\n", MODULE_NAME, __func__, __LINE__, ##__VA_ARGS__)
 130 +#else
 131 +#define print_debug(fmt,...)
 132 +#endif
 133 +#define print_err(fmt,...) printk(KERN_ERR "%s:%s:%d: "fmt"\n", MODULE_NAME, __func__,__LINE__, ##__VA_ARGS__)
 134 +
 135 +#define VC_TAG_GET_TEMP 0x00030006
 136 +#define VC_TAG_GET_MAX_TEMP 0x0003000A
 137 +
 138 +typedef enum {
 139 +       TEMP,
 140 +       MAX_TEMP,
 141 +} temp_type;
 142 +
 143 +/* --- STRUCTS --- */
 144 +/* tag part of the message */
 145 +struct vc_msg_tag {
 146 +       uint32_t tag_id;                /* the tag ID for the temperature */
 147 +       uint32_t buffer_size;   /* size of the buffer (should be 8) */
 148 +       uint32_t request_code;  /* identifies message as a request (should be 0) */
 149 +       uint32_t id;                    /* extra ID field (should be 0) */
 150 +       uint32_t val;                   /* returned value of the temperature */
 151 +};
 152 +
 153 +/* message structure to be sent to videocore */
 154 +struct vc_msg {
 155 +       uint32_t msg_size;              /* simply, sizeof(struct vc_msg) */
 156 +       uint32_t request_code;          /* holds various information like the success and number of bytes returned (refer to mailboxes wiki) */
 157 +       struct vc_msg_tag tag;          /* the tag structure above to make */
 158 +       uint32_t end_tag;               /* an end identifier, should be set to NULL */
 159 +};
 160 +
 161 +struct bcm2835_thermal_data {
 162 +       struct thermal_zone_device *thermal_dev;
 163 +       struct vc_msg msg;
 164 +};
 165 +
 166 +/* --- GLOBALS --- */
 167 +static struct bcm2835_thermal_data bcm2835_data;
 168 +
 169 +/* Thermal Device Operations */
 170 +static struct thermal_zone_device_ops ops;
 171 +
 172 +/* --- FUNCTIONS --- */
 173 +
 174 +static int bcm2835_get_temp_or_max(struct thermal_zone_device *thermal_dev, unsigned long *temp, unsigned tag_id)
 175 +{
 176 +       int result = -1, retry = 3;
 177 +       print_debug("IN");
 178 +
 179 +       *temp = 0;
 180 +       while (result != 0 && retry-- > 0) {
 181 +               /* wipe all previous message data */
 182 +               memset(&bcm2835_data.msg, 0, sizeof bcm2835_data.msg);
 183 +
 184 +               /* prepare message */
 185 +               bcm2835_data.msg.msg_size = sizeof bcm2835_data.msg;
 186 +               bcm2835_data.msg.tag.buffer_size = 8;
 187 +               bcm2835_data.msg.tag.tag_id = tag_id;
 188 +
 189 +               /* send the message */
 190 +               result = bcm_mailbox_property(&bcm2835_data.msg, sizeof bcm2835_data.msg);
 191 +               print_debug("Got %stemperature as %u (%d,%x)\n", tag_id==VC_TAG_GET_MAX_TEMP ? "max ":"", (uint)bcm2835_data.msg.tag.val, result, bcm2835_data.msg.request_code);
 192 +               if (!(bcm2835_data.msg.request_code & 0x80000000))
 193 +                       result = -1;
 194 +       }
 195 +
 196 +       /* check if it was all ok and return the rate in milli degrees C */
 197 +       if (result == 0)
 198 +               *temp = (uint)bcm2835_data.msg.tag.val;
 199 +       else
 200 +               print_err("Failed to get temperature! (%x:%d)\n", tag_id, result);
 201 +       print_debug("OUT");
 202 +       return result;
 203 +}
 204 +
 205 +static int bcm2835_get_temp(struct thermal_zone_device *thermal_dev, unsigned long *temp)
 206 +{
 207 +       return bcm2835_get_temp_or_max(thermal_dev, temp, VC_TAG_GET_TEMP);
 208 +}
 209 +
 210 +static int bcm2835_get_max_temp(struct thermal_zone_device *thermal_dev, int trip_num, unsigned long *temp)
 211 +{
 212 +       return bcm2835_get_temp_or_max(thermal_dev, temp, VC_TAG_GET_MAX_TEMP);
 213 +}
 214 +
 215 +static int bcm2835_get_trip_type(struct thermal_zone_device * thermal_dev, int trip_num, enum thermal_trip_type *trip_type)
 216 +{
 217 +       *trip_type = THERMAL_TRIP_HOT;
 218 +       return 0;
 219 +}
 220 +
 221 +
 222 +static int bcm2835_get_mode(struct thermal_zone_device *thermal_dev, enum thermal_device_mode *dev_mode)
 223 +{
 224 +       *dev_mode = THERMAL_DEVICE_ENABLED;
 225 +       return 0;
 226 +}
 227 +
 228 +
 229 +static int bcm2835_thermal_probe(struct platform_device *pdev)
 230 +{
 231 +       print_debug("IN");
 232 +       print_debug("THERMAL Driver has been probed!");
 233 +
 234 +       /* check that the device isn't null!*/
 235 +       if(pdev == NULL)
 236 +       {
 237 +               print_debug("Platform device is empty!");
 238 +               return -ENODEV;
 239 +       }
 240 +
 241 +       if(!(bcm2835_data.thermal_dev = thermal_zone_device_register("bcm2835_thermal",  1, 0, NULL, &ops, NULL, 0, 0)))
 242 +       {
 243 +               print_debug("Unable to register the thermal device!");
 244 +               return -EFAULT;
 245 +       }
 246 +       return 0;
 247 +}
 248 +
 249 +
 250 +static int bcm2835_thermal_remove(struct platform_device *pdev)
 251 +{
 252 +       print_debug("IN");
 253 +
 254 +       thermal_zone_device_unregister(bcm2835_data.thermal_dev);
 255 +
 256 +       print_debug("OUT");
 257 +
 258 +       return 0;
 259 +}
 260 +
 261 +static struct thermal_zone_device_ops ops  = {
 262 +       .get_temp = bcm2835_get_temp,
 263 +       .get_trip_temp = bcm2835_get_max_temp,
 264 +       .get_trip_type = bcm2835_get_trip_type,
 265 +       .get_mode = bcm2835_get_mode,
 266 +};
 267 +
 268 +static const struct of_device_id bcm2835_thermal_of_match_table[] = {
 269 +       { .compatible = "brcm,bcm2835-thermal", },
 270 +       {},
 271 +};
 272 +MODULE_DEVICE_TABLE(of, bcm2835_thermal_of_match_table);
 273 +
 274 +static struct platform_driver bcm2835_thermal_driver = {
 275 +       .probe = bcm2835_thermal_probe,
 276 +       .remove = bcm2835_thermal_remove,
 277 +       .driver = {
 278 +                               .name = "bcm2835_thermal",
 279 +                               .owner = THIS_MODULE,
 280 +                               .of_match_table = bcm2835_thermal_of_match_table,
 281 +                       },
 282 +};
 283 +
 284 +MODULE_LICENSE("GPL");
 285 +MODULE_AUTHOR("Dorian Peake");
 286 +MODULE_DESCRIPTION("Thermal driver for bcm2835 chip");
 287 +
 288 +module_platform_driver(bcm2835_thermal_driver);