openwrtv3/target/linux/brcm2708/patches-4.1/0135-thermal-bcm2835-Use-firmware-API.patch
John Crispin bf28fb50bf brcm2708: update 4.1 patches
As usual, this patches were taken (and rebased) from
https://github.com/raspberrypi/linux/commits/rpi-4.1.y

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

SVN-Revision: 47258
2015-10-26 09:01:05 +00:00

281 lines
8.5 KiB
Diff

From fb11a46fed3871b67fcf71631910afba21e6fc22 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
Date: Mon, 20 Jul 2015 12:17:10 +0200
Subject: [PATCH 135/203] thermal: bcm2835: Use firmware API
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Use the new firmware API instead of the legacy mailbox API.
Remove retry loop on failure to read temperature.
Clean up code.
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
---
arch/arm/boot/dts/bcm2708_common.dtsi | 1 +
drivers/thermal/bcm2835-thermal.c | 197 +++++++++++++---------------------
2 files changed, 75 insertions(+), 123 deletions(-)
--- a/arch/arm/boot/dts/bcm2708_common.dtsi
+++ b/arch/arm/boot/dts/bcm2708_common.dtsi
@@ -230,6 +230,7 @@
thermal: thermal {
compatible = "brcm,bcm2835-thermal";
+ firmware = <&firmware>;
};
};
--- a/drivers/thermal/bcm2835-thermal.c
+++ b/drivers/thermal/bcm2835-thermal.c
@@ -12,161 +12,113 @@
* consent.
*****************************************************************************/
-#include <linux/kernel.h>
#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/platform_data/mailbox-bcm2708.h>
#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/sysfs.h>
#include <linux/thermal.h>
+#include <soc/bcm2835/raspberrypi-firmware.h>
-
-/* --- DEFINITIONS --- */
-#define MODULE_NAME "bcm2835_thermal"
-
-/*#define THERMAL_DEBUG_ENABLE*/
-
-#ifdef THERMAL_DEBUG_ENABLE
-#define print_debug(fmt,...) printk(KERN_INFO "%s:%s:%d: "fmt"\n", MODULE_NAME, __func__, __LINE__, ##__VA_ARGS__)
-#else
-#define print_debug(fmt,...)
-#endif
-#define print_err(fmt,...) printk(KERN_ERR "%s:%s:%d: "fmt"\n", MODULE_NAME, __func__,__LINE__, ##__VA_ARGS__)
-
-#define VC_TAG_GET_TEMP 0x00030006
-#define VC_TAG_GET_MAX_TEMP 0x0003000A
-
-typedef enum {
- TEMP,
- MAX_TEMP,
-} temp_type;
-
-/* --- STRUCTS --- */
-/* tag part of the message */
-struct vc_msg_tag {
- uint32_t tag_id; /* the tag ID for the temperature */
- uint32_t buffer_size; /* size of the buffer (should be 8) */
- uint32_t request_code; /* identifies message as a request (should be 0) */
- uint32_t id; /* extra ID field (should be 0) */
- uint32_t val; /* returned value of the temperature */
-};
-
-/* message structure to be sent to videocore */
-struct vc_msg {
- uint32_t msg_size; /* simply, sizeof(struct vc_msg) */
- uint32_t request_code; /* holds various information like the success and number of bytes returned (refer to mailboxes wiki) */
- struct vc_msg_tag tag; /* the tag structure above to make */
- uint32_t end_tag; /* an end identifier, should be set to NULL */
-};
-
-struct bcm2835_thermal_data {
- struct thermal_zone_device *thermal_dev;
- struct vc_msg msg;
-};
-
-/* --- GLOBALS --- */
-static struct bcm2835_thermal_data bcm2835_data;
-
-/* Thermal Device Operations */
-static struct thermal_zone_device_ops ops;
-
-/* --- FUNCTIONS --- */
-
-static int bcm2835_get_temp_or_max(struct thermal_zone_device *thermal_dev, unsigned long *temp, unsigned tag_id)
+static int bcm2835_thermal_get_property(struct thermal_zone_device *tz,
+ unsigned long *temp, u32 tag)
{
- int result = -1, retry = 3;
- print_debug("IN");
+ struct rpi_firmware *fw = tz->devdata;
+ struct {
+ u32 id;
+ u32 val;
+ } packet;
+ int ret;
*temp = 0;
- while (result != 0 && retry-- > 0) {
- /* wipe all previous message data */
- memset(&bcm2835_data.msg, 0, sizeof bcm2835_data.msg);
-
- /* prepare message */
- bcm2835_data.msg.msg_size = sizeof bcm2835_data.msg;
- bcm2835_data.msg.tag.buffer_size = 8;
- bcm2835_data.msg.tag.tag_id = tag_id;
-
- /* send the message */
- result = bcm_mailbox_property(&bcm2835_data.msg, sizeof bcm2835_data.msg);
- 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);
- if (!(bcm2835_data.msg.request_code & 0x80000000))
- result = -1;
+ packet.id = 0;
+ ret = rpi_firmware_property(fw, tag, &packet, sizeof(packet));
+ if (ret) {
+ dev_err(&tz->device, "Failed to get temperature\n");
+ return ret;
}
- /* check if it was all ok and return the rate in milli degrees C */
- if (result == 0)
- *temp = (uint)bcm2835_data.msg.tag.val;
- else
- print_err("Failed to get temperature! (%x:%d)\n", tag_id, result);
- print_debug("OUT");
- return result;
+ *temp = packet.val;
+ dev_dbg(&tz->device, "%stemp=%lu\n",
+ tag == RPI_FIRMWARE_GET_MAX_TEMPERATURE ? "max" : "", *temp);
+
+ return 0;
}
-static int bcm2835_get_temp(struct thermal_zone_device *thermal_dev, unsigned long *temp)
+static int bcm2835_thermal_get_temp(struct thermal_zone_device *tz,
+ unsigned long *temp)
{
- return bcm2835_get_temp_or_max(thermal_dev, temp, VC_TAG_GET_TEMP);
+ return bcm2835_thermal_get_property(tz, temp,
+ RPI_FIRMWARE_GET_TEMPERATURE);
}
-static int bcm2835_get_max_temp(struct thermal_zone_device *thermal_dev, int trip_num, unsigned long *temp)
+static int bcm2835_thermal_get_max_temp(struct thermal_zone_device *tz,
+ int trip, unsigned long *temp)
{
- return bcm2835_get_temp_or_max(thermal_dev, temp, VC_TAG_GET_MAX_TEMP);
+ /*
+ * The maximum safe temperature of the SoC.
+ * Overclock may be disabled above this temperature.
+ */
+ return bcm2835_thermal_get_property(tz, temp,
+ RPI_FIRMWARE_GET_MAX_TEMPERATURE);
}
-static int bcm2835_get_trip_type(struct thermal_zone_device * thermal_dev, int trip_num, enum thermal_trip_type *trip_type)
+static int bcm2835_thermal_get_trip_type(struct thermal_zone_device *tz,
+ int trip, enum thermal_trip_type *type)
{
- *trip_type = THERMAL_TRIP_HOT;
+ *type = THERMAL_TRIP_HOT;
+
return 0;
}
-
-static int bcm2835_get_mode(struct thermal_zone_device *thermal_dev, enum thermal_device_mode *dev_mode)
+static int bcm2835_thermal_get_mode(struct thermal_zone_device *tz,
+ enum thermal_device_mode *mode)
{
- *dev_mode = THERMAL_DEVICE_ENABLED;
+ *mode = THERMAL_DEVICE_ENABLED;
+
return 0;
}
+static struct thermal_zone_device_ops ops = {
+ .get_temp = bcm2835_thermal_get_temp,
+ .get_trip_temp = bcm2835_thermal_get_max_temp,
+ .get_trip_type = bcm2835_thermal_get_trip_type,
+ .get_mode = bcm2835_thermal_get_mode,
+};
static int bcm2835_thermal_probe(struct platform_device *pdev)
{
- print_debug("IN");
- print_debug("THERMAL Driver has been probed!");
-
- /* check that the device isn't null!*/
- if(pdev == NULL)
- {
- print_debug("Platform device is empty!");
- return -ENODEV;
+ struct device_node *fw_np;
+ struct rpi_firmware *fw;
+ struct thermal_zone_device *tz;
+
+ fw_np = of_parse_phandle(pdev->dev.of_node, "firmware", 0);
+/* Remove comment when booting without Device Tree is no longer supported
+ if (!fw_np) {
+ dev_err(&pdev->dev, "Missing firmware node\n");
+ return -ENOENT;
}
-
- if(!(bcm2835_data.thermal_dev = thermal_zone_device_register("bcm2835_thermal", 1, 0, NULL, &ops, NULL, 0, 0)))
- {
- print_debug("Unable to register the thermal device!");
- return -EFAULT;
+*/
+ fw = rpi_firmware_get(fw_np);
+ if (!fw)
+ return -EPROBE_DEFER;
+
+ tz = thermal_zone_device_register("bcm2835_thermal", 1, 0, fw, &ops,
+ NULL, 0, 0);
+ if (IS_ERR(tz)) {
+ dev_err(&pdev->dev, "Failed to register the thermal device\n");
+ return PTR_ERR(tz);
}
+
+ platform_set_drvdata(pdev, tz);
+
return 0;
}
-
static int bcm2835_thermal_remove(struct platform_device *pdev)
{
- print_debug("IN");
-
- thermal_zone_device_unregister(bcm2835_data.thermal_dev);
-
- print_debug("OUT");
+ thermal_zone_device_unregister(platform_get_drvdata(pdev));
return 0;
}
-static struct thermal_zone_device_ops ops = {
- .get_temp = bcm2835_get_temp,
- .get_trip_temp = bcm2835_get_max_temp,
- .get_trip_type = bcm2835_get_trip_type,
- .get_mode = bcm2835_get_mode,
-};
-
static const struct of_device_id bcm2835_thermal_of_match_table[] = {
{ .compatible = "brcm,bcm2835-thermal", },
{},
@@ -177,14 +129,13 @@ static struct platform_driver bcm2835_th
.probe = bcm2835_thermal_probe,
.remove = bcm2835_thermal_remove,
.driver = {
- .name = "bcm2835_thermal",
- .owner = THIS_MODULE,
- .of_match_table = bcm2835_thermal_of_match_table,
- },
+ .name = "bcm2835_thermal",
+ .of_match_table = bcm2835_thermal_of_match_table,
+ },
};
+module_platform_driver(bcm2835_thermal_driver);
-MODULE_LICENSE("GPL");
MODULE_AUTHOR("Dorian Peake");
+MODULE_AUTHOR("Noralf Trønnes");
MODULE_DESCRIPTION("Thermal driver for bcm2835 chip");
-
-module_platform_driver(bcm2835_thermal_driver);
+MODULE_LICENSE("GPL");