p71924506
/
linux_old1
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Merge branch 'pm-devfreq' 

* pm-devfreq:
  PM / devfreq: style/typo fixes
  PM / devfreq: exynos: Add the detailed correlation for Exynos5422 bus
  PM / devfreq: event: Find the instance of devfreq-event device by using phandle
  PM / devfreq: event: Add new Exynos NoC probe driver
  MAINTAINERS: Add samsung bus frequency driver entry
  PM / devfreq: exynos: Remove unused exynos4/5 busfreq driver
  PM / devfreq: exynos: Add the detailed correlation between sub-blocks and power line
  PM / devfreq: exynos: Update documentation for bus devices using passive governor
  PM / devfreq: exynos: Add support of bus frequency of sub-blocks using passive governor
  PM / devfreq: Add new passive governor
  PM / devfreq: Add new DEVFREQ_TRANSITION_NOTIFIER notifier
  PM / devfreq: Add devfreq_get_devfreq_by_phandle()
  PM / devfreq: exynos: Add documentation for generic exynos bus frequency driver
  PM / devfreq: exynos: Add generic exynos bus frequency driver
This commit is contained in:
Rafael J. Wysocki 2016-05-16 14:31:15 +02:00
parent acc53b49b1 512eae392a
commit 7777c2785b
20 changed files with 1942 additions and 1824 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
Documentation/devicetree/bindings/devfreq/event/exynos-nocp.txt Normal file
View File

@ -0,0 +1,26 @@
* Samsung Exynos NoC (Network on Chip) Probe device
The Samsung Exynos542x SoC has NoC (Network on Chip) Probe for NoC bus.
NoC provides the primitive values to get the performance data. The packets
that the Network on Chip (NoC) probes detects are transported over
the network infrastructure to observer units. You can configure probes to
capture packets with header or data on the data request response network,
or as traffic debug or statistic collectors. Exynos542x bus has multiple
NoC probes to provide bandwidth information about behavior of the SoC
that you can use while analyzing system performance.
Required properties:
- compatible: Should be "samsung,exynos5420-nocp"
- reg: physical base address of each NoC Probe and length of memory mapped region.
Optional properties:
- clock-names : the name of clock used by the NoC Probe, "nocp"
- clocks : phandles for clock specified in "clock-names" property
Example : NoC Probe nodes in Device Tree are listed below.
nocp_mem0_0: nocp@10CA1000 {
compatible = "samsung,exynos5420-nocp";
reg = <0x10CA1000 0x200>;
};

409
Documentation/devicetree/bindings/devfreq/exynos-bus.txt Normal file
View File

@ -0,0 +1,409 @@
* Generic Exynos Bus frequency device
The Samsung Exynos SoC has many buses for data transfer between DRAM
and sub-blocks in SoC. Most Exynos SoCs share the common architecture
for buses. Generally, each bus of Exynos SoC includes a source clock
and a power line, which are able to change the clock frequency
of the bus in runtime. To monitor the usage of each bus in runtime,
the driver uses the PPMU (Platform Performance Monitoring Unit), which
is able to measure the current load of sub-blocks.
The Exynos SoC includes the various sub-blocks which have the each AXI bus.
The each AXI bus has the owned source clock but, has not the only owned
power line. The power line might be shared among one more sub-blocks.
So, we can divide into two type of device as the role of each sub-block.
There are two type of bus devices as following:
- parent bus device
- passive bus device
Basically, parent and passive bus device share the same power line.
The parent bus device can only change the voltage of shared power line
and the rest bus devices (passive bus device) depend on the decision of
the parent bus device. If there are three blocks which share the VDD_xxx
power line, Only one block should be parent device and then the rest blocks
should depend on the parent device as passive device.
VDD_xxx |--- A block (parent)
|--- B block (passive)
|--- C block (passive)
There are a little different composition among Exynos SoC because each Exynos
SoC has different sub-blocks. Therefore, such difference should be specified
in devicetree file instead of each device driver. In result, this driver
is able to support the bus frequency for all Exynos SoCs.
Required properties for all bus devices:
- compatible: Should be "samsung,exynos-bus".
- clock-names : the name of clock used by the bus, "bus".
- clocks : phandles for clock specified in "clock-names" property.
- operating-points-v2: the OPP table including frequency/voltage information
to support DVFS (Dynamic Voltage/Frequency Scaling) feature.
Required properties only for parent bus device:
- vdd-supply: the regulator to provide the buses with the voltage.
- devfreq-events: the devfreq-event device to monitor the current utilization
of buses.
Required properties only for passive bus device:
- devfreq: the parent bus device.
Optional properties only for parent bus device:
- exynos,saturation-ratio: the percentage value which is used to calibrate
the performance count against total cycle count.
- exynos,voltage-tolerance: the percentage value for bus voltage tolerance
which is used to calculate the max voltage.
Detailed correlation between sub-blocks and power line according to Exynos SoC:
- In case of Exynos3250, there are two power line as following:
VDD_MIF |--- DMC
VDD_INT |--- LEFTBUS (parent device)
|--- PERIL
|--- MFC
|--- G3D
|--- RIGHTBUS
|--- PERIR
|--- FSYS
|--- LCD0
|--- PERIR
|--- ISP
|--- CAM
- In case of Exynos4210, there is one power line as following:
VDD_INT |--- DMC (parent device)
|--- LEFTBUS
|--- PERIL
|--- MFC(L)
|--- G3D
|--- TV
|--- LCD0
|--- RIGHTBUS
|--- PERIR
|--- MFC(R)
|--- CAM
|--- FSYS
|--- GPS
|--- LCD0
|--- LCD1
- In case of Exynos4x12, there are two power line as following:
VDD_MIF |--- DMC
VDD_INT |--- LEFTBUS (parent device)
|--- PERIL
|--- MFC(L)
|--- G3D
|--- TV
|--- IMAGE
|--- RIGHTBUS
|--- PERIR
|--- MFC(R)
|--- CAM
|--- FSYS
|--- GPS
|--- LCD0
|--- ISP
- In case of Exynos5422, there are two power line as following:
VDD_MIF |--- DREX 0 (parent device, DRAM EXpress controller)
|--- DREX 1
VDD_INT |--- NoC_Core (parent device)
|--- G2D
|--- G3D
|--- DISP1
|--- NoC_WCORE
|--- GSCL
|--- MSCL
|--- ISP
|--- MFC
|--- GEN
|--- PERIS
|--- PERIC
|--- FSYS
|--- FSYS2
Example1:
Show the AXI buses of Exynos3250 SoC. Exynos3250 divides the buses to
power line (regulator). The MIF (Memory Interface) AXI bus is used to
transfer data between DRAM and CPU and uses the VDD_MIF regulator.
- MIF (Memory Interface) block
: VDD_MIF |--- DMC (Dynamic Memory Controller)
- INT (Internal) block
: VDD_INT |--- LEFTBUS (parent device)
|--- PERIL
|--- MFC
|--- G3D
|--- RIGHTBUS
|--- FSYS
|--- LCD0
|--- PERIR
|--- ISP
|--- CAM
- MIF bus's frequency/voltage table
-----------------------
|Lv| Freq | Voltage |
-----------------------
|L1| 50000 |800000 |
|L2| 100000 |800000 |
|L3| 134000 |800000 |
|L4| 200000 |825000 |
|L5| 400000 |875000 |
-----------------------
- INT bus's frequency/voltage table
----------------------------------------------------------
|Block|LEFTBUS|RIGHTBUS|MCUISP |ISP |PERIL ||VDD_INT |
| name| |LCD0 | | | || |
| | |FSYS | | | || |
| | |MFC | | | || |
----------------------------------------------------------
|Mode |*parent|passive |passive|passive|passive|| |
----------------------------------------------------------
|Lv |Frequency ||Voltage |
----------------------------------------------------------
|L1 |50000 |50000 |50000 |50000 |50000 ||900000 |
|L2 |80000 |80000 |80000 |80000 |80000 ||900000 |
|L3 |100000 |100000 |100000 |100000 |100000 ||1000000 |
|L4 |134000 |134000 |200000 |200000 | ||1000000 |
|L5 |200000 |200000 |400000 |300000 | ||1000000 |
----------------------------------------------------------
Example2 :
The bus of DMC (Dynamic Memory Controller) block in exynos3250.dtsi
is listed below:
bus_dmc: bus_dmc {
compatible = "samsung,exynos-bus";
clocks = <&cmu_dmc CLK_DIV_DMC>;
clock-names = "bus";
operating-points-v2 = <&bus_dmc_opp_table>;
status = "disabled";
};
bus_dmc_opp_table: opp_table1 {
compatible = "operating-points-v2";
opp-shared;
opp@50000000 {
opp-hz = /bits/ 64 <50000000>;
opp-microvolt = <800000>;
};
opp@100000000 {
opp-hz = /bits/ 64 <100000000>;
opp-microvolt = <800000>;
};
opp@134000000 {
opp-hz = /bits/ 64 <134000000>;
opp-microvolt = <800000>;
};
opp@200000000 {
opp-hz = /bits/ 64 <200000000>;
opp-microvolt = <825000>;
};
opp@400000000 {
opp-hz = /bits/ 64 <400000000>;
opp-microvolt = <875000>;
};
};
bus_leftbus: bus_leftbus {
compatible = "samsung,exynos-bus";
clocks = <&cmu CLK_DIV_GDL>;
clock-names = "bus";
operating-points-v2 = <&bus_leftbus_opp_table>;
status = "disabled";
};
bus_rightbus: bus_rightbus {
compatible = "samsung,exynos-bus";
clocks = <&cmu CLK_DIV_GDR>;
clock-names = "bus";
operating-points-v2 = <&bus_leftbus_opp_table>;
status = "disabled";
};
bus_lcd0: bus_lcd0 {
compatible = "samsung,exynos-bus";
clocks = <&cmu CLK_DIV_ACLK_160>;
clock-names = "bus";
operating-points-v2 = <&bus_leftbus_opp_table>;
status = "disabled";
};
bus_fsys: bus_fsys {
compatible = "samsung,exynos-bus";
clocks = <&cmu CLK_DIV_ACLK_200>;
clock-names = "bus";
operating-points-v2 = <&bus_leftbus_opp_table>;
status = "disabled";
};
bus_mcuisp: bus_mcuisp {
compatible = "samsung,exynos-bus";
clocks = <&cmu CLK_DIV_ACLK_400_MCUISP>;
clock-names = "bus";
operating-points-v2 = <&bus_mcuisp_opp_table>;
status = "disabled";
};
bus_isp: bus_isp {
compatible = "samsung,exynos-bus";
clocks = <&cmu CLK_DIV_ACLK_266>;
clock-names = "bus";
operating-points-v2 = <&bus_isp_opp_table>;
status = "disabled";
};
bus_peril: bus_peril {
compatible = "samsung,exynos-bus";
clocks = <&cmu CLK_DIV_ACLK_100>;
clock-names = "bus";
operating-points-v2 = <&bus_peril_opp_table>;
status = "disabled";
};
bus_mfc: bus_mfc {
compatible = "samsung,exynos-bus";
clocks = <&cmu CLK_SCLK_MFC>;
clock-names = "bus";
operating-points-v2 = <&bus_leftbus_opp_table>;
status = "disabled";
};
bus_leftbus_opp_table: opp_table1 {
compatible = "operating-points-v2";
opp-shared;
opp@50000000 {
opp-hz = /bits/ 64 <50000000>;
opp-microvolt = <900000>;
};
opp@80000000 {
opp-hz = /bits/ 64 <80000000>;
opp-microvolt = <900000>;
};
opp@100000000 {
opp-hz = /bits/ 64 <100000000>;
opp-microvolt = <1000000>;
};
opp@134000000 {
opp-hz = /bits/ 64 <134000000>;
opp-microvolt = <1000000>;
};
opp@200000000 {
opp-hz = /bits/ 64 <200000000>;
opp-microvolt = <1000000>;
};
};
bus_mcuisp_opp_table: opp_table2 {
compatible = "operating-points-v2";
opp-shared;
opp@50000000 {
opp-hz = /bits/ 64 <50000000>;
};
opp@80000000 {
opp-hz = /bits/ 64 <80000000>;
};
opp@100000000 {
opp-hz = /bits/ 64 <100000000>;
};
opp@200000000 {
opp-hz = /bits/ 64 <200000000>;
};
opp@400000000 {
opp-hz = /bits/ 64 <400000000>;
};
};
bus_isp_opp_table: opp_table3 {
compatible = "operating-points-v2";
opp-shared;
opp@50000000 {
opp-hz = /bits/ 64 <50000000>;
};
opp@80000000 {
opp-hz = /bits/ 64 <80000000>;
};
opp@100000000 {
opp-hz = /bits/ 64 <100000000>;
};
opp@200000000 {
opp-hz = /bits/ 64 <200000000>;
};
opp@300000000 {
opp-hz = /bits/ 64 <300000000>;
};
};
bus_peril_opp_table: opp_table4 {
compatible = "operating-points-v2";
opp-shared;
opp@50000000 {
opp-hz = /bits/ 64 <50000000>;
};
opp@80000000 {
opp-hz = /bits/ 64 <80000000>;
};
opp@100000000 {
opp-hz = /bits/ 64 <100000000>;
};
};
Usage case to handle the frequency and voltage of bus on runtime
in exynos3250-rinato.dts is listed below:
&bus_dmc {
devfreq-events = <&ppmu_dmc0_3>, <&ppmu_dmc1_3>;
vdd-supply = <&buck1_reg>; /* VDD_MIF */
status = "okay";
};
&bus_leftbus {
devfreq-events = <&ppmu_leftbus_3>, <&ppmu_rightbus_3>;
vdd-supply = <&buck3_reg>;
status = "okay";
};
&bus_rightbus {
devfreq = <&bus_leftbus>;
status = "okay";
};
&bus_lcd0 {
devfreq = <&bus_leftbus>;
status = "okay";
};
&bus_fsys {
devfreq = <&bus_leftbus>;
status = "okay";
};
&bus_mcuisp {
devfreq = <&bus_leftbus>;
status = "okay";
};
&bus_isp {
devfreq = <&bus_leftbus>;
status = "okay";
};
&bus_peril {
devfreq = <&bus_leftbus>;
status = "okay";
};
&bus_mfc {
devfreq = <&bus_leftbus>;
status = "okay";
};

9
MAINTAINERS
View File

@ -3540,6 +3540,15 @@ F: drivers/devfreq/devfreq-event.c
F: include/linux/devfreq-event.h
F: Documentation/devicetree/bindings/devfreq/event/
BUS FREQUENCY DRIVER FOR SAMSUNG EXYNOS
M: Chanwoo Choi <cw00.choi@samsung.com>
L: linux-pm@vger.kernel.org
L: linux-samsung-soc@vger.kernel.org
T: git git://git.kernel.org/pub/scm/linux/kernel/git/mzx/devfreq.git
S: Maintained
F: drivers/devfreq/exynos-bus.c
F: Documentation/devicetree/bindings/devfreq/exynos-bus.txt
DEVICE NUMBER REGISTRY
M: Torben Mathiasen <device@lanana.org>
W: http://lanana.org/docs/device-list/index.html

36
drivers/devfreq/Kconfig
View File

@ -64,30 +64,32 @@ config DEVFREQ_GOV_USERSPACE
Otherwise, the governor does not change the frequency
given at the initialization.
config DEVFREQ_GOV_PASSIVE
tristate "Passive"
help
Sets the frequency based on the frequency of its parent devfreq
device. This governor does not change the frequency by itself
through sysfs entries. The passive governor recommends that
devfreq device uses the OPP table to get the frequency/voltage.
comment "DEVFREQ Drivers"
config ARM_EXYNOS4_BUS_DEVFREQ
bool "ARM Exynos4210/4212/4412 Memory Bus DEVFREQ Driver"
depends on (CPU_EXYNOS4210 || SOC_EXYNOS4212 || SOC_EXYNOS4412) && !ARCH_MULTIPLATFORM
config ARM_EXYNOS_BUS_DEVFREQ
bool "ARM EXYNOS Generic Memory Bus DEVFREQ Driver"
depends on ARCH_EXYNOS
select DEVFREQ_GOV_SIMPLE_ONDEMAND
select DEVFREQ_GOV_PASSIVE
select DEVFREQ_EVENT_EXYNOS_PPMU
select PM_DEVFREQ_EVENT
select PM_OPP
help
This adds the DEVFREQ driver for Exynos4210 memory bus (vdd_int)
and Exynos4212/4412 memory interface and bus (vdd_mif + vdd_int).
It reads PPMU counters of memory controllers and adjusts
the operating frequencies and voltages with OPP support.
This adds the common DEVFREQ driver for Exynos Memory bus. Exynos
Memory bus has one more group of memory bus (e.g, MIF and INT block).
Each memory bus group could contain many memoby bus block. It reads
PPMU counters of memory controllers by using DEVFREQ-event device
and adjusts the operating frequencies and voltages with OPP support.
This does not yet operate with optimal voltages.
config ARM_EXYNOS5_BUS_DEVFREQ
tristate "ARM Exynos5250 Bus DEVFREQ Driver"
depends on SOC_EXYNOS5250
select DEVFREQ_GOV_SIMPLE_ONDEMAND
select PM_OPP
help
This adds the DEVFREQ driver for Exynos5250 bus interface (vdd_int).
It reads PPMU counters of memory controllers and adjusts the
operating frequencies and voltages with OPP support.
config ARM_TEGRA_DEVFREQ
tristate "Tegra DEVFREQ Driver"
depends on ARCH_TEGRA_124_SOC

4
drivers/devfreq/Makefile
View File

@ -4,10 +4,10 @@ obj-$(CONFIG_DEVFREQ_GOV_SIMPLE_ONDEMAND) += governor_simpleondemand.o
obj-$(CONFIG_DEVFREQ_GOV_PERFORMANCE) += governor_performance.o
obj-$(CONFIG_DEVFREQ_GOV_POWERSAVE) += governor_powersave.o
obj-$(CONFIG_DEVFREQ_GOV_USERSPACE) += governor_userspace.o
obj-$(CONFIG_DEVFREQ_GOV_PASSIVE) += governor_passive.o
# DEVFREQ Drivers
obj-$(CONFIG_ARM_EXYNOS4_BUS_DEVFREQ) += exynos/
obj-$(CONFIG_ARM_EXYNOS5_BUS_DEVFREQ) += exynos/
obj-$(CONFIG_ARM_EXYNOS_BUS_DEVFREQ) += exynos-bus.o
obj-$(CONFIG_ARM_TEGRA_DEVFREQ) += tegra-devfreq.o
# DEVFREQ Event Drivers

5
drivers/devfreq/devfreq-event.c
View File

@ -234,6 +234,11 @@ struct devfreq_event_dev *devfreq_event_get_edev_by_phandle(struct device *dev,
return ERR_PTR(-ENODEV);
mutex_lock(&devfreq_event_list_lock);
list_for_each_entry(edev, &devfreq_event_list, node) {
if (edev->dev.parent && edev->dev.parent->of_node == node)
goto out;
}
list_for_each_entry(edev, &devfreq_event_list, node) {
if (!strcmp(edev->desc->name, node->name))
goto out;

207
drivers/devfreq/devfreq.c
View File

@ -25,6 +25,7 @@
#include <linux/list.h>
#include <linux/printk.h>
#include <linux/hrtimer.h>
#include <linux/of.h>
#include "governor.h"
static struct class *devfreq_class;
@ -188,6 +189,29 @@ static struct devfreq_governor *find_devfreq_governor(const char *name)
return ERR_PTR(-ENODEV);
}
static int devfreq_notify_transition(struct devfreq *devfreq,
struct devfreq_freqs *freqs, unsigned int state)
{
if (!devfreq)
return -EINVAL;
switch (state) {
case DEVFREQ_PRECHANGE:
srcu_notifier_call_chain(&devfreq->transition_notifier_list,
DEVFREQ_PRECHANGE, freqs);
break;
case DEVFREQ_POSTCHANGE:
srcu_notifier_call_chain(&devfreq->transition_notifier_list,
DEVFREQ_POSTCHANGE, freqs);
break;
default:
return -EINVAL;
}
return 0;
}
/* Load monitoring helper functions for governors use */
/**
@ -199,7 +223,8 @@ static struct devfreq_governor *find_devfreq_governor(const char *name)
*/
int update_devfreq(struct devfreq *devfreq)
{
unsigned long freq;
struct devfreq_freqs freqs;
unsigned long freq, cur_freq;
int err = 0;
u32 flags = 0;
@ -233,10 +258,22 @@ int update_devfreq(struct devfreq *devfreq)
flags |= DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use LUB */
}
if (devfreq->profile->get_cur_freq)
devfreq->profile->get_cur_freq(devfreq->dev.parent, &cur_freq);
else
cur_freq = devfreq->previous_freq;
freqs.old = cur_freq;
freqs.new = freq;
devfreq_notify_transition(devfreq, &freqs, DEVFREQ_PRECHANGE);
err = devfreq->profile->target(devfreq->dev.parent, &freq, flags);
if (err)
return err;
freqs.new = freq;
devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE);
if (devfreq->profile->freq_table)
if (devfreq_update_status(devfreq, freq))
dev_err(&devfreq->dev,
@ -541,6 +578,8 @@ struct devfreq *devfreq_add_device(struct device *dev,
goto err_out;
}
srcu_init_notifier_head(&devfreq->transition_notifier_list);
mutex_unlock(&devfreq->lock);
mutex_lock(&devfreq_list_lock);
@ -639,6 +678,49 @@ struct devfreq *devm_devfreq_add_device(struct device *dev,
}
EXPORT_SYMBOL(devm_devfreq_add_device);
#ifdef CONFIG_OF
/*
* devfreq_get_devfreq_by_phandle - Get the devfreq device from devicetree
* @dev - instance to the given device
* @index - index into list of devfreq
*
* return the instance of devfreq device
*/
struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index)
{
struct device_node *node;
struct devfreq *devfreq;
if (!dev)
return ERR_PTR(-EINVAL);
if (!dev->of_node)
return ERR_PTR(-EINVAL);
node = of_parse_phandle(dev->of_node, "devfreq", index);
if (!node)
return ERR_PTR(-ENODEV);
mutex_lock(&devfreq_list_lock);
list_for_each_entry(devfreq, &devfreq_list, node) {
if (devfreq->dev.parent
&& devfreq->dev.parent->of_node == node) {
mutex_unlock(&devfreq_list_lock);
return devfreq;
}
}
mutex_unlock(&devfreq_list_lock);
return ERR_PTR(-EPROBE_DEFER);
}
#else
struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index)
{
return ERR_PTR(-ENODEV);
}
#endif /* CONFIG_OF */
EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_phandle);
/**
* devm_devfreq_remove_device() - Resource-managed devfreq_remove_device()
* @dev: the device to add devfreq feature.
@ -1266,6 +1348,129 @@ void devm_devfreq_unregister_opp_notifier(struct device *dev,
}
EXPORT_SYMBOL(devm_devfreq_unregister_opp_notifier);
/**
* devfreq_register_notifier() - Register a driver with devfreq
* @devfreq: The devfreq object.
* @nb: The notifier block to register.
* @list: DEVFREQ_TRANSITION_NOTIFIER.
*/
int devfreq_register_notifier(struct devfreq *devfreq,
struct notifier_block *nb,
unsigned int list)
{
int ret = 0;
if (!devfreq)
return -EINVAL;
switch (list) {
case DEVFREQ_TRANSITION_NOTIFIER:
ret = srcu_notifier_chain_register(
&devfreq->transition_notifier_list, nb);
break;
default:
ret = -EINVAL;
}
return ret;
}
EXPORT_SYMBOL(devfreq_register_notifier);
/*
* devfreq_unregister_notifier() - Unregister a driver with devfreq
* @devfreq: The devfreq object.
* @nb: The notifier block to be unregistered.
* @list: DEVFREQ_TRANSITION_NOTIFIER.
*/
int devfreq_unregister_notifier(struct devfreq *devfreq,
struct notifier_block *nb,
unsigned int list)
{
int ret = 0;
if (!devfreq)
return -EINVAL;
switch (list) {
case DEVFREQ_TRANSITION_NOTIFIER:
ret = srcu_notifier_chain_unregister(
&devfreq->transition_notifier_list, nb);
break;
default:
ret = -EINVAL;
}
return ret;
}
EXPORT_SYMBOL(devfreq_unregister_notifier);
struct devfreq_notifier_devres {
struct devfreq *devfreq;
struct notifier_block *nb;
unsigned int list;
};
static void devm_devfreq_notifier_release(struct device *dev, void *res)
{
struct devfreq_notifier_devres *this = res;
devfreq_unregister_notifier(this->devfreq, this->nb, this->list);
}
/**
* devm_devfreq_register_notifier()
- Resource-managed devfreq_register_notifier()
* @dev: The devfreq user device. (parent of devfreq)
* @devfreq: The devfreq object.
* @nb: The notifier block to be unregistered.
* @list: DEVFREQ_TRANSITION_NOTIFIER.
*/
int devm_devfreq_register_notifier(struct device *dev,
struct devfreq *devfreq,
struct notifier_block *nb,
unsigned int list)
{
struct devfreq_notifier_devres *ptr;
int ret;
ptr = devres_alloc(devm_devfreq_notifier_release, sizeof(*ptr),
GFP_KERNEL);
if (!ptr)
return -ENOMEM;
ret = devfreq_register_notifier(devfreq, nb, list);
if (ret) {
devres_free(ptr);
return ret;
}
ptr->devfreq = devfreq;
ptr->nb = nb;
ptr->list = list;
devres_add(dev, ptr);
return 0;
}
EXPORT_SYMBOL(devm_devfreq_register_notifier);
/**
* devm_devfreq_unregister_notifier()
- Resource-managed devfreq_unregister_notifier()
* @dev: The devfreq user device. (parent of devfreq)
* @devfreq: The devfreq object.
* @nb: The notifier block to be unregistered.
* @list: DEVFREQ_TRANSITION_NOTIFIER.
*/
void devm_devfreq_unregister_notifier(struct device *dev,
struct devfreq *devfreq,
struct notifier_block *nb,
unsigned int list)
{
WARN_ON(devres_release(dev, devm_devfreq_notifier_release,
devm_devfreq_dev_match, devfreq));
}
EXPORT_SYMBOL(devm_devfreq_unregister_notifier);
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
MODULE_DESCRIPTION("devfreq class support");
MODULE_LICENSE("GPL");

8
drivers/devfreq/event/Kconfig
View File

@ -13,6 +13,14 @@ menuconfig PM_DEVFREQ_EVENT
if PM_DEVFREQ_EVENT
config DEVFREQ_EVENT_EXYNOS_NOCP
bool "EXYNOS NoC (Network On Chip) Probe DEVFREQ event Driver"
depends on ARCH_EXYNOS
select PM_OPP
help
This add the devfreq-event driver for Exynos SoC. It provides NoC
(Network on Chip) Probe counters to measure the bandwidth of AXI bus.
config DEVFREQ_EVENT_EXYNOS_PPMU
bool "EXYNOS PPMU (Platform Performance Monitoring Unit) DEVFREQ event Driver"
depends on ARCH_EXYNOS

2
drivers/devfreq/event/Makefile
View File

@ -1,2 +1,4 @@
# Exynos DEVFREQ Event Drivers
obj-$(CONFIG_DEVFREQ_EVENT_EXYNOS_NOCP) += exynos-nocp.o
obj-$(CONFIG_DEVFREQ_EVENT_EXYNOS_PPMU) += exynos-ppmu.o

304
drivers/devfreq/event/exynos-nocp.c Normal file
View File

@ -0,0 +1,304 @@
/*
* exynos-nocp.c - EXYNOS NoC (Network On Chip) Probe support
*
* Copyright (c) 2016 Samsung Electronics Co., Ltd.
* Author : Chanwoo Choi <cw00.choi@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/devfreq-event.h>
#include <linux/kernel.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include "exynos-nocp.h"
struct exynos_nocp {
struct devfreq_event_dev *edev;
struct devfreq_event_desc desc;
struct device *dev;
struct regmap *regmap;
struct clk *clk;
};
/*
* The devfreq-event ops structure for nocp probe.
*/
static int exynos_nocp_set_event(struct devfreq_event_dev *edev)
{
struct exynos_nocp *nocp = devfreq_event_get_drvdata(edev);
int ret;
/* Disable NoC probe */
ret = regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL,
NOCP_MAIN_CTL_STATEN_MASK, 0);
if (ret < 0) {
dev_err(nocp->dev, "failed to disable the NoC probe device\n");
return ret;
}
/* Set a statistics dump period to 0 */
ret = regmap_write(nocp->regmap, NOCP_STAT_PERIOD, 0x0);
if (ret < 0)
goto out;
/* Set the IntEvent fields of *_SRC */
ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_0_SRC,
NOCP_CNT_SRC_INTEVENT_MASK,
NOCP_CNT_SRC_INTEVENT_BYTE_MASK);
if (ret < 0)
goto out;
ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_1_SRC,
NOCP_CNT_SRC_INTEVENT_MASK,
NOCP_CNT_SRC_INTEVENT_CHAIN_MASK);
if (ret < 0)
goto out;
ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_2_SRC,
NOCP_CNT_SRC_INTEVENT_MASK,
NOCP_CNT_SRC_INTEVENT_CYCLE_MASK);
if (ret < 0)
goto out;
ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_3_SRC,
NOCP_CNT_SRC_INTEVENT_MASK,
NOCP_CNT_SRC_INTEVENT_CHAIN_MASK);
if (ret < 0)
goto out;
/* Set an alarm with a max/min value of 0 to generate StatALARM */
ret = regmap_write(nocp->regmap, NOCP_STAT_ALARM_MIN, 0x0);
if (ret < 0)
goto out;
ret = regmap_write(nocp->regmap, NOCP_STAT_ALARM_MAX, 0x0);
if (ret < 0)
goto out;
/* Set AlarmMode */
ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_0_ALARM_MODE,
NOCP_CNT_ALARM_MODE_MASK,
NOCP_CNT_ALARM_MODE_MIN_MAX_MASK);
if (ret < 0)
goto out;
ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_1_ALARM_MODE,
NOCP_CNT_ALARM_MODE_MASK,
NOCP_CNT_ALARM_MODE_MIN_MAX_MASK);
if (ret < 0)
goto out;
ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_2_ALARM_MODE,
NOCP_CNT_ALARM_MODE_MASK,
NOCP_CNT_ALARM_MODE_MIN_MAX_MASK);
if (ret < 0)
goto out;
ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_3_ALARM_MODE,
NOCP_CNT_ALARM_MODE_MASK,
NOCP_CNT_ALARM_MODE_MIN_MAX_MASK);
if (ret < 0)
goto out;
/* Enable the measurements by setting AlarmEn and StatEn */
ret = regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL,
NOCP_MAIN_CTL_STATEN_MASK | NOCP_MAIN_CTL_ALARMEN_MASK,
NOCP_MAIN_CTL_STATEN_MASK | NOCP_MAIN_CTL_ALARMEN_MASK);
if (ret < 0)
goto out;
/* Set GlobalEN */
ret = regmap_update_bits(nocp->regmap, NOCP_CFG_CTL,
NOCP_CFG_CTL_GLOBALEN_MASK,
NOCP_CFG_CTL_GLOBALEN_MASK);
if (ret < 0)
goto out;
/* Enable NoC probe */
ret = regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL,
NOCP_MAIN_CTL_STATEN_MASK,
NOCP_MAIN_CTL_STATEN_MASK);
if (ret < 0)
goto out;
return 0;
out:
/* Reset NoC probe */
if (regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL,
NOCP_MAIN_CTL_STATEN_MASK, 0)) {
dev_err(nocp->dev, "Failed to reset NoC probe device\n");
}
return ret;
}
static int exynos_nocp_get_event(struct devfreq_event_dev *edev,
struct devfreq_event_data *edata)
{
struct exynos_nocp *nocp = devfreq_event_get_drvdata(edev);
unsigned int counter[4];
int ret;
/* Read cycle count */
ret = regmap_read(nocp->regmap, NOCP_COUNTERS_0_VAL, &counter[0]);
if (ret < 0)
goto out;
ret = regmap_read(nocp->regmap, NOCP_COUNTERS_1_VAL, &counter[1]);
if (ret < 0)
goto out;
ret = regmap_read(nocp->regmap, NOCP_COUNTERS_2_VAL, &counter[2]);
if (ret < 0)
goto out;
ret = regmap_read(nocp->regmap, NOCP_COUNTERS_3_VAL, &counter[3]);
if (ret < 0)
goto out;
edata->load_count = ((counter[1] << 16) | counter[0]);
edata->total_count = ((counter[3] << 16) | counter[2]);
dev_dbg(&edev->dev, "%s (event: %ld/%ld)\n", edev->desc->name,
edata->load_count, edata->total_count);
return 0;
out:
edata->load_count = 0;
edata->total_count = 0;
dev_err(nocp->dev, "Failed to read the counter of NoC probe device\n");
return ret;
}
static const struct devfreq_event_ops exynos_nocp_ops = {
.set_event = exynos_nocp_set_event,
.get_event = exynos_nocp_get_event,
};
static const struct of_device_id exynos_nocp_id_match[] = {
{ .compatible = "samsung,exynos5420-nocp", },
{ /* sentinel */ },
};
static struct regmap_config exynos_nocp_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.max_register = NOCP_COUNTERS_3_VAL,
};
static int exynos_nocp_parse_dt(struct platform_device *pdev,
struct exynos_nocp *nocp)
{
struct device *dev = nocp->dev;
struct device_node *np = dev->of_node;
struct resource *res;
void __iomem *base;
if (!np) {
dev_err(dev, "failed to find devicetree node\n");
return -EINVAL;
}
nocp->clk = devm_clk_get(dev, "nocp");
if (IS_ERR(nocp->clk))
nocp->clk = NULL;
/* Maps the memory mapped IO to control nocp register */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (IS_ERR(res))
return PTR_ERR(res);
base = devm_ioremap_resource(dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
exynos_nocp_regmap_config.max_register = resource_size(res) - 4;
nocp->regmap = devm_regmap_init_mmio(dev, base,
&exynos_nocp_regmap_config);
if (IS_ERR(nocp->regmap)) {
dev_err(dev, "failed to initialize regmap\n");
return PTR_ERR(nocp->regmap);
}
return 0;
}
static int exynos_nocp_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct exynos_nocp *nocp;
int ret;
nocp = devm_kzalloc(&pdev->dev, sizeof(*nocp), GFP_KERNEL);
if (!nocp)
return -ENOMEM;
nocp->dev = &pdev->dev;
/* Parse dt data to get resource */
ret = exynos_nocp_parse_dt(pdev, nocp);
if (ret < 0) {
dev_err(&pdev->dev,
"failed to parse devicetree for resource\n");
return ret;
}
/* Add devfreq-event device to measure the bandwidth of NoC */
nocp->desc.ops = &exynos_nocp_ops;
nocp->desc.driver_data = nocp;
nocp->desc.name = np->full_name;
nocp->edev = devm_devfreq_event_add_edev(&pdev->dev, &nocp->desc);
if (IS_ERR(nocp->edev)) {
dev_err(&pdev->dev,
"failed to add devfreq-event device\n");
return PTR_ERR(nocp->edev);
}
platform_set_drvdata(pdev, nocp);
clk_prepare_enable(nocp->clk);
pr_info("exynos-nocp: new NoC Probe device registered: %s\n",
dev_name(dev));
return 0;
}
static int exynos_nocp_remove(struct platform_device *pdev)
{
struct exynos_nocp *nocp = platform_get_drvdata(pdev);
clk_disable_unprepare(nocp->clk);
return 0;
}
static struct platform_driver exynos_nocp_driver = {
.probe = exynos_nocp_probe,
.remove = exynos_nocp_remove,
.driver = {
.name = "exynos-nocp",
.of_match_table = exynos_nocp_id_match,
},
};
module_platform_driver(exynos_nocp_driver);
MODULE_DESCRIPTION("Exynos NoC (Network on Chip) Probe driver");
MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
MODULE_LICENSE("GPL");

78
drivers/devfreq/event/exynos-nocp.h Normal file
View File

@ -0,0 +1,78 @@
/*
* exynos-nocp.h - EXYNOS NoC (Network on Chip) Probe header file
*
* Copyright (c) 2016 Samsung Electronics Co., Ltd.
* Author : Chanwoo Choi <cw00.choi@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __EXYNOS_NOCP_H__
#define __EXYNOS_NOCP_H__
enum nocp_reg {
NOCP_ID_REVISION_ID = 0x04,
NOCP_MAIN_CTL = 0x08,
NOCP_CFG_CTL = 0x0C,
NOCP_STAT_PERIOD = 0x24,
NOCP_STAT_GO = 0x28,
NOCP_STAT_ALARM_MIN = 0x2C,
NOCP_STAT_ALARM_MAX = 0x30,
NOCP_STAT_ALARM_STATUS = 0x34,
NOCP_STAT_ALARM_CLR = 0x38,
NOCP_COUNTERS_0_SRC = 0x138,
NOCP_COUNTERS_0_ALARM_MODE = 0x13C,
NOCP_COUNTERS_0_VAL = 0x140,
NOCP_COUNTERS_1_SRC = 0x14C,
NOCP_COUNTERS_1_ALARM_MODE = 0x150,
NOCP_COUNTERS_1_VAL = 0x154,
NOCP_COUNTERS_2_SRC = 0x160,
NOCP_COUNTERS_2_ALARM_MODE = 0x164,
NOCP_COUNTERS_2_VAL = 0x168,
NOCP_COUNTERS_3_SRC = 0x174,
NOCP_COUNTERS_3_ALARM_MODE = 0x178,
NOCP_COUNTERS_3_VAL = 0x17C,
};
/* NOCP_MAIN_CTL register */
#define NOCP_MAIN_CTL_ERREN_MASK BIT(0)
#define NOCP_MAIN_CTL_TRACEEN_MASK BIT(1)
#define NOCP_MAIN_CTL_PAYLOADEN_MASK BIT(2)
#define NOCP_MAIN_CTL_STATEN_MASK BIT(3)
#define NOCP_MAIN_CTL_ALARMEN_MASK BIT(4)
#define NOCP_MAIN_CTL_STATCONDDUMP_MASK BIT(5)
#define NOCP_MAIN_CTL_INTRUSIVEMODE_MASK BIT(6)
/* NOCP_CFG_CTL register */
#define NOCP_CFG_CTL_GLOBALEN_MASK BIT(0)
#define NOCP_CFG_CTL_ACTIVE_MASK BIT(1)
/* NOCP_COUNTERS_x_SRC register */
#define NOCP_CNT_SRC_INTEVENT_SHIFT 0
#define NOCP_CNT_SRC_INTEVENT_MASK (0x1F << NOCP_CNT_SRC_INTEVENT_SHIFT)
#define NOCP_CNT_SRC_INTEVENT_OFF_MASK (0x0 << NOCP_CNT_SRC_INTEVENT_SHIFT)
#define NOCP_CNT_SRC_INTEVENT_CYCLE_MASK (0x1 << NOCP_CNT_SRC_INTEVENT_SHIFT)
#define NOCP_CNT_SRC_INTEVENT_IDLE_MASK (0x2 << NOCP_CNT_SRC_INTEVENT_SHIFT)
#define NOCP_CNT_SRC_INTEVENT_XFER_MASK (0x3 << NOCP_CNT_SRC_INTEVENT_SHIFT)
#define NOCP_CNT_SRC_INTEVENT_BUSY_MASK (0x4 << NOCP_CNT_SRC_INTEVENT_SHIFT)
#define NOCP_CNT_SRC_INTEVENT_WAIT_MASK (0x5 << NOCP_CNT_SRC_INTEVENT_SHIFT)
#define NOCP_CNT_SRC_INTEVENT_PKT_MASK (0x6 << NOCP_CNT_SRC_INTEVENT_SHIFT)
#define NOCP_CNT_SRC_INTEVENT_BYTE_MASK (0x8 << NOCP_CNT_SRC_INTEVENT_SHIFT)
#define NOCP_CNT_SRC_INTEVENT_CHAIN_MASK (0x10 << NOCP_CNT_SRC_INTEVENT_SHIFT)
/* NOCP_COUNTERS_x_ALARM_MODE register */
#define NOCP_CNT_ALARM_MODE_SHIFT 0
#define NOCP_CNT_ALARM_MODE_MASK (0x3 << NOCP_CNT_ALARM_MODE_SHIFT)
#define NOCP_CNT_ALARM_MODE_OFF_MASK (0x0 << NOCP_CNT_ALARM_MODE_SHIFT)
#define NOCP_CNT_ALARM_MODE_MIN_MASK (0x1 << NOCP_CNT_ALARM_MODE_SHIFT)
#define NOCP_CNT_ALARM_MODE_MAX_MASK (0x2 << NOCP_CNT_ALARM_MODE_SHIFT)
#define NOCP_CNT_ALARM_MODE_MIN_MAX_MASK (0x3 << NOCP_CNT_ALARM_MODE_SHIFT)
#endif /* __EXYNOS_NOCP_H__ */

570
drivers/devfreq/exynos-bus.c Normal file
View File

@ -0,0 +1,570 @@
/*
* Generic Exynos Bus frequency driver with DEVFREQ Framework
*
* Copyright (c) 2016 Samsung Electronics Co., Ltd.
* Author : Chanwoo Choi <cw00.choi@samsung.com>
*
* This driver support Exynos Bus frequency feature by using
* DEVFREQ framework and is based on drivers/devfreq/exynos/exynos4_bus.c.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/clk.h>
#include <linux/devfreq.h>
#include <linux/devfreq-event.h>
#include <linux/device.h>
#include <linux/export.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/pm_opp.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#define DEFAULT_SATURATION_RATIO 40
#define DEFAULT_VOLTAGE_TOLERANCE 2
struct exynos_bus {
struct device *dev;
struct devfreq *devfreq;
struct devfreq_event_dev **edev;
unsigned int edev_count;
struct mutex lock;
struct dev_pm_opp *curr_opp;
struct regulator *regulator;
struct clk *clk;
unsigned int voltage_tolerance;
unsigned int ratio;
};
/*
* Control the devfreq-event device to get the current state of bus
*/
#define exynos_bus_ops_edev(ops) \
static int exynos_bus_##ops(struct exynos_bus *bus) \
{ \
int i, ret; \
\
for (i = 0; i < bus->edev_count; i++) { \
if (!bus->edev[i]) \
continue; \
ret = devfreq_event_##ops(bus->edev[i]); \
if (ret < 0) \
return ret; \
} \
\
return 0; \
}
exynos_bus_ops_edev(enable_edev);
exynos_bus_ops_edev(disable_edev);
exynos_bus_ops_edev(set_event);
static int exynos_bus_get_event(struct exynos_bus *bus,
struct devfreq_event_data *edata)
{
struct devfreq_event_data event_data;
unsigned long load_count = 0, total_count = 0;
int i, ret = 0;
for (i = 0; i < bus->edev_count; i++) {
if (!bus->edev[i])
continue;
ret = devfreq_event_get_event(bus->edev[i], &event_data);
if (ret < 0)
return ret;
if (i == 0 || event_data.load_count > load_count) {
load_count = event_data.load_count;
total_count = event_data.total_count;
}
}
edata->load_count = load_count;
edata->total_count = total_count;
return ret;
}
/*
* Must necessary function for devfreq simple-ondemand governor
*/
static int exynos_bus_target(struct device *dev, unsigned long *freq, u32 flags)
{
struct exynos_bus *bus = dev_get_drvdata(dev);
struct dev_pm_opp *new_opp;
unsigned long old_freq, new_freq, old_volt, new_volt, tol;
int ret = 0;
/* Get new opp-bus instance according to new bus clock */
rcu_read_lock();
new_opp = devfreq_recommended_opp(dev, freq, flags);
if (IS_ERR(new_opp)) {
dev_err(dev, "failed to get recommended opp instance\n");
rcu_read_unlock();
return PTR_ERR(new_opp);
}
new_freq = dev_pm_opp_get_freq(new_opp);
new_volt = dev_pm_opp_get_voltage(new_opp);
old_freq = dev_pm_opp_get_freq(bus->curr_opp);
old_volt = dev_pm_opp_get_voltage(bus->curr_opp);
rcu_read_unlock();
if (old_freq == new_freq)
return 0;
tol = new_volt * bus->voltage_tolerance / 100;
/* Change voltage and frequency according to new OPP level */
mutex_lock(&bus->lock);
if (old_freq < new_freq) {
ret = regulator_set_voltage_tol(bus->regulator, new_volt, tol);
if (ret < 0) {
dev_err(bus->dev, "failed to set voltage\n");
goto out;
}
}
ret = clk_set_rate(bus->clk, new_freq);
if (ret < 0) {
dev_err(dev, "failed to change clock of bus\n");
clk_set_rate(bus->clk, old_freq);
goto out;
}
if (old_freq > new_freq) {
ret = regulator_set_voltage_tol(bus->regulator, new_volt, tol);
if (ret < 0) {
dev_err(bus->dev, "failed to set voltage\n");
goto out;
}
}
bus->curr_opp = new_opp;
dev_dbg(dev, "Set the frequency of bus (%lukHz -> %lukHz)\n",
old_freq/1000, new_freq/1000);
out:
mutex_unlock(&bus->lock);
return ret;
}
static int exynos_bus_get_dev_status(struct device *dev,
struct devfreq_dev_status *stat)
{
struct exynos_bus *bus = dev_get_drvdata(dev);
struct devfreq_event_data edata;
int ret;
rcu_read_lock();
stat->current_frequency = dev_pm_opp_get_freq(bus->curr_opp);
rcu_read_unlock();
ret = exynos_bus_get_event(bus, &edata);
if (ret < 0) {
stat->total_time = stat->busy_time = 0;
goto err;
}
stat->busy_time = (edata.load_count * 100) / bus->ratio;
stat->total_time = edata.total_count;
dev_dbg(dev, "Usage of devfreq-event : %lu/%lu\n", stat->busy_time,
stat->total_time);
err:
ret = exynos_bus_set_event(bus);
if (ret < 0) {
dev_err(dev, "failed to set event to devfreq-event devices\n");
return ret;
}
return ret;
}
static void exynos_bus_exit(struct device *dev)
{
struct exynos_bus *bus = dev_get_drvdata(dev);
int ret;
ret = exynos_bus_disable_edev(bus);
if (ret < 0)
dev_warn(dev, "failed to disable the devfreq-event devices\n");
if (bus->regulator)
regulator_disable(bus->regulator);
dev_pm_opp_of_remove_table(dev);
clk_disable_unprepare(bus->clk);
}
/*
* Must necessary function for devfreq passive governor
*/
static int exynos_bus_passive_target(struct device *dev, unsigned long *freq,
u32 flags)
{
struct exynos_bus *bus = dev_get_drvdata(dev);
struct dev_pm_opp *new_opp;
unsigned long old_freq, new_freq;
int ret = 0;
/* Get new opp-bus instance according to new bus clock */
rcu_read_lock();
new_opp = devfreq_recommended_opp(dev, freq, flags);
if (IS_ERR(new_opp)) {
dev_err(dev, "failed to get recommended opp instance\n");
rcu_read_unlock();
return PTR_ERR(new_opp);
}
new_freq = dev_pm_opp_get_freq(new_opp);
old_freq = dev_pm_opp_get_freq(bus->curr_opp);
rcu_read_unlock();
if (old_freq == new_freq)
return 0;
/* Change the frequency according to new OPP level */
mutex_lock(&bus->lock);
ret = clk_set_rate(bus->clk, new_freq);
if (ret < 0) {
dev_err(dev, "failed to set the clock of bus\n");
goto out;
}
*freq = new_freq;
bus->curr_opp = new_opp;
dev_dbg(dev, "Set the frequency of bus (%lukHz -> %lukHz)\n",
old_freq/1000, new_freq/1000);
out:
mutex_unlock(&bus->lock);
return ret;
}
static void exynos_bus_passive_exit(struct device *dev)
{
struct exynos_bus *bus = dev_get_drvdata(dev);
dev_pm_opp_of_remove_table(dev);
clk_disable_unprepare(bus->clk);
}
static int exynos_bus_parent_parse_of(struct device_node *np,
struct exynos_bus *bus)
{
struct device *dev = bus->dev;
int i, ret, count, size;
/* Get the regulator to provide each bus with the power */
bus->regulator = devm_regulator_get(dev, "vdd");
if (IS_ERR(bus->regulator)) {
dev_err(dev, "failed to get VDD regulator\n");
return PTR_ERR(bus->regulator);
}
ret = regulator_enable(bus->regulator);
if (ret < 0) {
dev_err(dev, "failed to enable VDD regulator\n");
return ret;
}
/*
* Get the devfreq-event devices to get the current utilization of
* buses. This raw data will be used in devfreq ondemand governor.
*/
count = devfreq_event_get_edev_count(dev);
if (count < 0) {
dev_err(dev, "failed to get the count of devfreq-event dev\n");
ret = count;
goto err_regulator;
}
bus->edev_count = count;
size = sizeof(*bus->edev) * count;
bus->edev = devm_kzalloc(dev, size, GFP_KERNEL);
if (!bus->edev) {
ret = -ENOMEM;
goto err_regulator;
}
for (i = 0; i < count; i++) {
bus->edev[i] = devfreq_event_get_edev_by_phandle(dev, i);
if (IS_ERR(bus->edev[i])) {
ret = -EPROBE_DEFER;
goto err_regulator;
}
}
/*
* Optionally, Get the saturation ratio according to Exynos SoC
* When measuring the utilization of each AXI bus with devfreq-event
* devices, the measured real cycle might be much lower than the
* total cycle of bus during sampling rate. In result, the devfreq
* simple-ondemand governor might not decide to change the current
* frequency due to too utilization (= real cycle/total cycle).
* So, this property is used to adjust the utilization when calculating
* the busy_time in exynos_bus_get_dev_status().
*/
if (of_property_read_u32(np, "exynos,saturation-ratio", &bus->ratio))
bus->ratio = DEFAULT_SATURATION_RATIO;
if (of_property_read_u32(np, "exynos,voltage-tolerance",
&bus->voltage_tolerance))
bus->voltage_tolerance = DEFAULT_VOLTAGE_TOLERANCE;
return 0;
err_regulator:
regulator_disable(bus->regulator);
return ret;
}
static int exynos_bus_parse_of(struct device_node *np,
struct exynos_bus *bus)
{
struct device *dev = bus->dev;
unsigned long rate;
int ret;
/* Get the clock to provide each bus with source clock */
bus->clk = devm_clk_get(dev, "bus");
if (IS_ERR(bus->clk)) {
dev_err(dev, "failed to get bus clock\n");
return PTR_ERR(bus->clk);
}
ret = clk_prepare_enable(bus->clk);
if (ret < 0) {
dev_err(dev, "failed to get enable clock\n");
return ret;
}
/* Get the freq and voltage from OPP table to scale the bus freq */
rcu_read_lock();
ret = dev_pm_opp_of_add_table(dev);
if (ret < 0) {
dev_err(dev, "failed to get OPP table\n");
rcu_read_unlock();
goto err_clk;
}
rate = clk_get_rate(bus->clk);
bus->curr_opp = devfreq_recommended_opp(dev, &rate, 0);
if (IS_ERR(bus->curr_opp)) {
dev_err(dev, "failed to find dev_pm_opp\n");
rcu_read_unlock();
ret = PTR_ERR(bus->curr_opp);
goto err_opp;
}
rcu_read_unlock();
return 0;
err_opp:
dev_pm_opp_of_remove_table(dev);
err_clk:
clk_disable_unprepare(bus->clk);
return ret;
}
static int exynos_bus_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct devfreq_dev_profile *profile;
struct devfreq_simple_ondemand_data *ondemand_data;
struct devfreq_passive_data *passive_data;
struct devfreq *parent_devfreq;
struct exynos_bus *bus;
int ret, max_state;
unsigned long min_freq, max_freq;
if (!np) {
dev_err(dev, "failed to find devicetree node\n");
return -EINVAL;
}
bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL);
if (!bus)
return -ENOMEM;
mutex_init(&bus->lock);
bus->dev = &pdev->dev;
platform_set_drvdata(pdev, bus);
/* Parse the device-tree to get the resource information */
ret = exynos_bus_parse_of(np, bus);
if (ret < 0)
goto err;
profile = devm_kzalloc(dev, sizeof(*profile), GFP_KERNEL);
if (!profile) {
ret = -ENOMEM;
goto err;
}
if (of_parse_phandle(dev->of_node, "devfreq", 0))
goto passive;
else
ret = exynos_bus_parent_parse_of(np, bus);
if (ret < 0)
goto err;
/* Initialize the struct profile and governor data for parent device */
profile->polling_ms = 50;
profile->target = exynos_bus_target;
profile->get_dev_status = exynos_bus_get_dev_status;
profile->exit = exynos_bus_exit;
ondemand_data = devm_kzalloc(dev, sizeof(*ondemand_data), GFP_KERNEL);
if (!ondemand_data) {
ret = -ENOMEM;
goto err;
}
ondemand_data->upthreshold = 40;
ondemand_data->downdifferential = 5;
/* Add devfreq device to monitor and handle the exynos bus */
bus->devfreq = devm_devfreq_add_device(dev, profile, "simple_ondemand",
ondemand_data);
if (IS_ERR(bus->devfreq)) {
dev_err(dev, "failed to add devfreq device\n");
ret = PTR_ERR(bus->devfreq);
goto err;
}
/* Register opp_notifier to catch the change of OPP */
ret = devm_devfreq_register_opp_notifier(dev, bus->devfreq);
if (ret < 0) {
dev_err(dev, "failed to register opp notifier\n");
goto err;
}
/*
* Enable devfreq-event to get raw data which is used to determine
* current bus load.
*/
ret = exynos_bus_enable_edev(bus);
if (ret < 0) {
dev_err(dev, "failed to enable devfreq-event devices\n");
goto err;
}
ret = exynos_bus_set_event(bus);
if (ret < 0) {
dev_err(dev, "failed to set event to devfreq-event devices\n");
goto err;
}
goto out;
passive:
/* Initialize the struct profile and governor data for passive device */
profile->target = exynos_bus_passive_target;
profile->exit = exynos_bus_passive_exit;
/* Get the instance of parent devfreq device */
parent_devfreq = devfreq_get_devfreq_by_phandle(dev, 0);
if (IS_ERR(parent_devfreq)) {
ret = -EPROBE_DEFER;
goto err;
}
passive_data = devm_kzalloc(dev, sizeof(*passive_data), GFP_KERNEL);
if (!passive_data) {
ret = -ENOMEM;
goto err;
}
passive_data->parent = parent_devfreq;
/* Add devfreq device for exynos bus with passive governor */
bus->devfreq = devm_devfreq_add_device(dev, profile, "passive",
passive_data);
if (IS_ERR(bus->devfreq)) {
dev_err(dev,
"failed to add devfreq dev with passive governor\n");
ret = -EPROBE_DEFER;
goto err;
}
out:
max_state = bus->devfreq->profile->max_state;
min_freq = (bus->devfreq->profile->freq_table[0] / 1000);
max_freq = (bus->devfreq->profile->freq_table[max_state - 1] / 1000);
pr_info("exynos-bus: new bus device registered: %s (%6ld KHz ~ %6ld KHz)\n",
dev_name(dev), min_freq, max_freq);
return 0;
err:
dev_pm_opp_of_remove_table(dev);
clk_disable_unprepare(bus->clk);
return ret;
}
#ifdef CONFIG_PM_SLEEP
static int exynos_bus_resume(struct device *dev)
{
struct exynos_bus *bus = dev_get_drvdata(dev);
int ret;
ret = exynos_bus_enable_edev(bus);
if (ret < 0) {
dev_err(dev, "failed to enable the devfreq-event devices\n");
return ret;
}
return 0;
}
static int exynos_bus_suspend(struct device *dev)
{
struct exynos_bus *bus = dev_get_drvdata(dev);
int ret;
ret = exynos_bus_disable_edev(bus);
if (ret < 0) {
dev_err(dev, "failed to disable the devfreq-event devices\n");
return ret;
}
return 0;
}
#endif
static const struct dev_pm_ops exynos_bus_pm = {
SET_SYSTEM_SLEEP_PM_OPS(exynos_bus_suspend, exynos_bus_resume)
};
static const struct of_device_id exynos_bus_of_match[] = {
{ .compatible = "samsung,exynos-bus", },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, exynos_bus_of_match);
static struct platform_driver exynos_bus_platdrv = {
.probe = exynos_bus_probe,
.driver = {
.name = "exynos-bus",
.pm = &exynos_bus_pm,
.of_match_table = of_match_ptr(exynos_bus_of_match),
},
};
module_platform_driver(exynos_bus_platdrv);
MODULE_DESCRIPTION("Generic Exynos Bus frequency driver");
MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
MODULE_LICENSE("GPL v2");

3
drivers/devfreq/exynos/Makefile
View File

@ -1,3 +0,0 @@
# Exynos DEVFREQ Drivers
obj-$(CONFIG_ARM_EXYNOS4_BUS_DEVFREQ) += exynos_ppmu.o exynos4_bus.o
obj-$(CONFIG_ARM_EXYNOS5_BUS_DEVFREQ) += exynos_ppmu.o exynos5_bus.o

1055
drivers/devfreq/exynos/exynos4_bus.c
View File

File diff suppressed because it is too large Load Diff

110
drivers/devfreq/exynos/exynos4_bus.h
View File

@ -1,110 +0,0 @@
/*
* Copyright (c) 2013 Samsung Electronics Co., Ltd.
* http://www.samsung.com/
*
* EXYNOS4 BUS header
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __DEVFREQ_EXYNOS4_BUS_H
#define __DEVFREQ_EXYNOS4_BUS_H __FILE__
#include <mach/map.h>
#define EXYNOS4_CLKDIV_LEFTBUS (S5P_VA_CMU + 0x04500)
#define EXYNOS4_CLKDIV_STAT_LEFTBUS (S5P_VA_CMU + 0x04600)
#define EXYNOS4_CLKDIV_RIGHTBUS (S5P_VA_CMU + 0x08500)
#define EXYNOS4_CLKDIV_STAT_RIGHTBUS (S5P_VA_CMU + 0x08600)
#define EXYNOS4_CLKDIV_TOP (S5P_VA_CMU + 0x0C510)
#define EXYNOS4_CLKDIV_CAM (S5P_VA_CMU + 0x0C520)
#define EXYNOS4_CLKDIV_MFC (S5P_VA_CMU + 0x0C528)
#define EXYNOS4_CLKDIV_STAT_TOP (S5P_VA_CMU + 0x0C610)
#define EXYNOS4_CLKDIV_STAT_MFC (S5P_VA_CMU + 0x0C628)
#define EXYNOS4210_CLKGATE_IP_IMAGE (S5P_VA_CMU + 0x0C930)
#define EXYNOS4212_CLKGATE_IP_IMAGE (S5P_VA_CMU + 0x04930)
#define EXYNOS4_CLKDIV_DMC0 (S5P_VA_CMU + 0x10500)
#define EXYNOS4_CLKDIV_DMC1 (S5P_VA_CMU + 0x10504)
#define EXYNOS4_CLKDIV_STAT_DMC0 (S5P_VA_CMU + 0x10600)
#define EXYNOS4_CLKDIV_STAT_DMC1 (S5P_VA_CMU + 0x10604)
#define EXYNOS4_DMC_PAUSE_CTRL (S5P_VA_CMU + 0x11094)
#define EXYNOS4_DMC_PAUSE_ENABLE (1 << 0)
#define EXYNOS4_CLKDIV_DMC0_ACP_SHIFT (0)
#define EXYNOS4_CLKDIV_DMC0_ACP_MASK (0x7 << EXYNOS4_CLKDIV_DMC0_ACP_SHIFT)
#define EXYNOS4_CLKDIV_DMC0_ACPPCLK_SHIFT (4)
#define EXYNOS4_CLKDIV_DMC0_ACPPCLK_MASK (0x7 << EXYNOS4_CLKDIV_DMC0_ACPPCLK_SHIFT)
#define EXYNOS4_CLKDIV_DMC0_DPHY_SHIFT (8)
#define EXYNOS4_CLKDIV_DMC0_DPHY_MASK (0x7 << EXYNOS4_CLKDIV_DMC0_DPHY_SHIFT)
#define EXYNOS4_CLKDIV_DMC0_DMC_SHIFT (12)
#define EXYNOS4_CLKDIV_DMC0_DMC_MASK (0x7 << EXYNOS4_CLKDIV_DMC0_DMC_SHIFT)
#define EXYNOS4_CLKDIV_DMC0_DMCD_SHIFT (16)
#define EXYNOS4_CLKDIV_DMC0_DMCD_MASK (0x7 << EXYNOS4_CLKDIV_DMC0_DMCD_SHIFT)
#define EXYNOS4_CLKDIV_DMC0_DMCP_SHIFT (20)
#define EXYNOS4_CLKDIV_DMC0_DMCP_MASK (0x7 << EXYNOS4_CLKDIV_DMC0_DMCP_SHIFT)
#define EXYNOS4_CLKDIV_DMC0_COPY2_SHIFT (24)
#define EXYNOS4_CLKDIV_DMC0_COPY2_MASK (0x7 << EXYNOS4_CLKDIV_DMC0_COPY2_SHIFT)
#define EXYNOS4_CLKDIV_DMC0_CORETI_SHIFT (28)
#define EXYNOS4_CLKDIV_DMC0_CORETI_MASK (0x7 << EXYNOS4_CLKDIV_DMC0_CORETI_SHIFT)
#define EXYNOS4_CLKDIV_DMC1_G2D_ACP_SHIFT (0)
#define EXYNOS4_CLKDIV_DMC1_G2D_ACP_MASK (0xf << EXYNOS4_CLKDIV_DMC1_G2D_ACP_SHIFT)
#define EXYNOS4_CLKDIV_DMC1_C2C_SHIFT (4)
#define EXYNOS4_CLKDIV_DMC1_C2C_MASK (0x7 << EXYNOS4_CLKDIV_DMC1_C2C_SHIFT)
#define EXYNOS4_CLKDIV_DMC1_PWI_SHIFT (8)
#define EXYNOS4_CLKDIV_DMC1_PWI_MASK (0xf << EXYNOS4_CLKDIV_DMC1_PWI_SHIFT)
#define EXYNOS4_CLKDIV_DMC1_C2CACLK_SHIFT (12)
#define EXYNOS4_CLKDIV_DMC1_C2CACLK_MASK (0x7 << EXYNOS4_CLKDIV_DMC1_C2CACLK_SHIFT)
#define EXYNOS4_CLKDIV_DMC1_DVSEM_SHIFT (16)
#define EXYNOS4_CLKDIV_DMC1_DVSEM_MASK (0x7f << EXYNOS4_CLKDIV_DMC1_DVSEM_SHIFT)
#define EXYNOS4_CLKDIV_DMC1_DPM_SHIFT (24)
#define EXYNOS4_CLKDIV_DMC1_DPM_MASK (0x7f << EXYNOS4_CLKDIV_DMC1_DPM_SHIFT)
#define EXYNOS4_CLKDIV_MFC_SHIFT (0)
#define EXYNOS4_CLKDIV_MFC_MASK (0x7 << EXYNOS4_CLKDIV_MFC_SHIFT)
#define EXYNOS4_CLKDIV_TOP_ACLK200_SHIFT (0)
#define EXYNOS4_CLKDIV_TOP_ACLK200_MASK (0x7 << EXYNOS4_CLKDIV_TOP_ACLK200_SHIFT)
#define EXYNOS4_CLKDIV_TOP_ACLK100_SHIFT (4)
#define EXYNOS4_CLKDIV_TOP_ACLK100_MASK (0xF << EXYNOS4_CLKDIV_TOP_ACLK100_SHIFT)
#define EXYNOS4_CLKDIV_TOP_ACLK160_SHIFT (8)
#define EXYNOS4_CLKDIV_TOP_ACLK160_MASK (0x7 << EXYNOS4_CLKDIV_TOP_ACLK160_SHIFT)
#define EXYNOS4_CLKDIV_TOP_ACLK133_SHIFT (12)
#define EXYNOS4_CLKDIV_TOP_ACLK133_MASK (0x7 << EXYNOS4_CLKDIV_TOP_ACLK133_SHIFT)
#define EXYNOS4_CLKDIV_TOP_ONENAND_SHIFT (16)
#define EXYNOS4_CLKDIV_TOP_ONENAND_MASK (0x7 << EXYNOS4_CLKDIV_TOP_ONENAND_SHIFT)
#define EXYNOS4_CLKDIV_TOP_ACLK266_GPS_SHIFT (20)
#define EXYNOS4_CLKDIV_TOP_ACLK266_GPS_MASK (0x7 << EXYNOS4_CLKDIV_TOP_ACLK266_GPS_SHIFT)
#define EXYNOS4_CLKDIV_TOP_ACLK400_MCUISP_SHIFT (24)
#define EXYNOS4_CLKDIV_TOP_ACLK400_MCUISP_MASK (0x7 << EXYNOS4_CLKDIV_TOP_ACLK400_MCUISP_SHIFT)
#define EXYNOS4_CLKDIV_BUS_GDLR_SHIFT (0)
#define EXYNOS4_CLKDIV_BUS_GDLR_MASK (0x7 << EXYNOS4_CLKDIV_BUS_GDLR_SHIFT)
#define EXYNOS4_CLKDIV_BUS_GPLR_SHIFT (4)
#define EXYNOS4_CLKDIV_BUS_GPLR_MASK (0x7 << EXYNOS4_CLKDIV_BUS_GPLR_SHIFT)
#define EXYNOS4_CLKDIV_CAM_FIMC0_SHIFT (0)
#define EXYNOS4_CLKDIV_CAM_FIMC0_MASK (0xf << EXYNOS4_CLKDIV_CAM_FIMC0_SHIFT)
#define EXYNOS4_CLKDIV_CAM_FIMC1_SHIFT (4)
#define EXYNOS4_CLKDIV_CAM_FIMC1_MASK (0xf << EXYNOS4_CLKDIV_CAM_FIMC1_SHIFT)
#define EXYNOS4_CLKDIV_CAM_FIMC2_SHIFT (8)
#define EXYNOS4_CLKDIV_CAM_FIMC2_MASK (0xf << EXYNOS4_CLKDIV_CAM_FIMC2_SHIFT)
#define EXYNOS4_CLKDIV_CAM_FIMC3_SHIFT (12)
#define EXYNOS4_CLKDIV_CAM_FIMC3_MASK (0xf << EXYNOS4_CLKDIV_CAM_FIMC3_SHIFT)
#define EXYNOS4_CLKDIV_CAM1 (S5P_VA_CMU + 0x0C568)
#define EXYNOS4_CLKDIV_STAT_CAM1 (S5P_VA_CMU + 0x0C668)
#define EXYNOS4_CLKDIV_CAM1_JPEG_SHIFT (0)
#define EXYNOS4_CLKDIV_CAM1_JPEG_MASK (0xf << EXYNOS4_CLKDIV_CAM1_JPEG_SHIFT)
#endif /* __DEVFREQ_EXYNOS4_BUS_H */

431
drivers/devfreq/exynos/exynos5_bus.c
View File

@ -1,431 +0,0 @@
/*
* Copyright (c) 2012 Samsung Electronics Co., Ltd.
* http://www.samsung.com/
*
* EXYNOS5 INT clock frequency scaling support using DEVFREQ framework
* Based on work done by Jonghwan Choi <jhbird.choi@samsung.com>
* Support for only EXYNOS5250 is present.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/module.h>
#include <linux/devfreq.h>
#include <linux/io.h>
#include <linux/pm_opp.h>
#include <linux/slab.h>
#include <linux/suspend.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/pm_qos.h>
#include <linux/regulator/consumer.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include "exynos_ppmu.h"
#define MAX_SAFEVOLT 1100000 /* 1.10V */
/* Assume that the bus is saturated if the utilization is 25% */
#define INT_BUS_SATURATION_RATIO 25
enum int_level_idx {
LV_0,
LV_1,
LV_2,
LV_3,
LV_4,
_LV_END
};
enum exynos_ppmu_list {
PPMU_RIGHT,
PPMU_END,
};
struct busfreq_data_int {
struct device *dev;
struct devfreq *devfreq;
struct regulator *vdd_int;
struct busfreq_ppmu_data ppmu_data;
unsigned long curr_freq;
bool disabled;
struct notifier_block pm_notifier;
struct mutex lock;
struct pm_qos_request int_req;
struct clk *int_clk;
};
struct int_bus_opp_table {
unsigned int idx;
unsigned long clk;
unsigned long volt;
};
static struct int_bus_opp_table exynos5_int_opp_table[] = {
{LV_0, 266000, 1025000},
{LV_1, 200000, 1025000},
{LV_2, 160000, 1025000},
{LV_3, 133000, 1025000},
{LV_4, 100000, 1025000},
{0, 0, 0},
};
static int exynos5_int_setvolt(struct busfreq_data_int *data,
unsigned long volt)
{
return regulator_set_voltage(data->vdd_int, volt, MAX_SAFEVOLT);
}
static int exynos5_busfreq_int_target(struct device *dev, unsigned long *_freq,
u32 flags)
{
int err = 0;
struct platform_device *pdev = container_of(dev, struct platform_device,
dev);
struct busfreq_data_int *data = platform_get_drvdata(pdev);
struct dev_pm_opp *opp;
unsigned long old_freq, freq;
unsigned long volt;
rcu_read_lock();
opp = devfreq_recommended_opp(dev, _freq, flags);
if (IS_ERR(opp)) {
rcu_read_unlock();
dev_err(dev, "%s: Invalid OPP.\n", __func__);
return PTR_ERR(opp);
}
freq = dev_pm_opp_get_freq(opp);
volt = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
old_freq = data->curr_freq;
if (old_freq == freq)
return 0;
dev_dbg(dev, "targeting %lukHz %luuV\n", freq, volt);
mutex_lock(&data->lock);
if (data->disabled)
goto out;
if (freq > exynos5_int_opp_table[0].clk)
pm_qos_update_request(&data->int_req, freq * 16 / 1000);
else
pm_qos_update_request(&data->int_req, -1);
if (old_freq < freq)
err = exynos5_int_setvolt(data, volt);
if (err)
goto out;
err = clk_set_rate(data->int_clk, freq * 1000);
if (err)
goto out;
if (old_freq > freq)
err = exynos5_int_setvolt(data, volt);
if (err)
goto out;
data->curr_freq = freq;
out:
mutex_unlock(&data->lock);
return err;
}
static int exynos5_int_get_dev_status(struct device *dev,
struct devfreq_dev_status *stat)
{
struct platform_device *pdev = container_of(dev, struct platform_device,
dev);
struct busfreq_data_int *data = platform_get_drvdata(pdev);
struct busfreq_ppmu_data *ppmu_data = &data->ppmu_data;
int busier_dmc;
exynos_read_ppmu(ppmu_data);
busier_dmc = exynos_get_busier_ppmu(ppmu_data);
stat->current_frequency = data->curr_freq;
/* Number of cycles spent on memory access */
stat->busy_time = ppmu_data->ppmu[busier_dmc].count[PPMU_PMNCNT3];
stat->busy_time *= 100 / INT_BUS_SATURATION_RATIO;
stat->total_time = ppmu_data->ppmu[busier_dmc].ccnt;
return 0;
}
static struct devfreq_dev_profile exynos5_devfreq_int_profile = {
.initial_freq = 160000,
.polling_ms = 100,
.target = exynos5_busfreq_int_target,
.get_dev_status = exynos5_int_get_dev_status,
};
static int exynos5250_init_int_tables(struct busfreq_data_int *data)
{
int i, err = 0;
for (i = LV_0; i < _LV_END; i++) {
err = dev_pm_opp_add(data->dev, exynos5_int_opp_table[i].clk,
exynos5_int_opp_table[i].volt);
if (err) {
dev_err(data->dev, "Cannot add opp entries.\n");
return err;
}
}
return 0;
}
static int exynos5_busfreq_int_pm_notifier_event(struct notifier_block *this,
unsigned long event, void *ptr)
{
struct busfreq_data_int *data = container_of(this,
struct busfreq_data_int, pm_notifier);
struct dev_pm_opp *opp;
unsigned long maxfreq = ULONG_MAX;
unsigned long freq;
unsigned long volt;
int err = 0;
switch (event) {
case PM_SUSPEND_PREPARE:
/* Set Fastest and Deactivate DVFS */
mutex_lock(&data->lock);
data->disabled = true;
rcu_read_lock();
opp = dev_pm_opp_find_freq_floor(data->dev, &maxfreq);
if (IS_ERR(opp)) {
rcu_read_unlock();
err = PTR_ERR(opp);
goto unlock;
}
freq = dev_pm_opp_get_freq(opp);
volt = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
err = exynos5_int_setvolt(data, volt);
if (err)
goto unlock;
err = clk_set_rate(data->int_clk, freq * 1000);
if (err)
goto unlock;
data->curr_freq = freq;
unlock:
mutex_unlock(&data->lock);
if (err)
return NOTIFY_BAD;
return NOTIFY_OK;
case PM_POST_RESTORE:
case PM_POST_SUSPEND:
/* Reactivate */
mutex_lock(&data->lock);
data->disabled = false;
mutex_unlock(&data->lock);
return NOTIFY_OK;
}
return NOTIFY_DONE;
}
static int exynos5_busfreq_int_probe(struct platform_device *pdev)
{
struct busfreq_data_int *data;
struct busfreq_ppmu_data *ppmu_data;
struct dev_pm_opp *opp;
struct device *dev = &pdev->dev;
struct device_node *np;
unsigned long initial_freq;
unsigned long initial_volt;
int err = 0;
int i;
data = devm_kzalloc(&pdev->dev, sizeof(struct busfreq_data_int),
GFP_KERNEL);
if (data == NULL) {
dev_err(dev, "Cannot allocate memory.\n");
return -ENOMEM;
}
ppmu_data = &data->ppmu_data;
ppmu_data->ppmu_end = PPMU_END;
ppmu_data->ppmu = devm_kzalloc(dev,
sizeof(struct exynos_ppmu) * PPMU_END,
GFP_KERNEL);
if (!ppmu_data->ppmu) {
dev_err(dev, "Failed to allocate memory for exynos_ppmu\n");
return -ENOMEM;
}
np = of_find_compatible_node(NULL, NULL, "samsung,exynos5250-ppmu");
if (np == NULL) {
pr_err("Unable to find PPMU node\n");
return -ENOENT;
}
for (i = 0; i < ppmu_data->ppmu_end; i++) {
/* map PPMU memory region */
ppmu_data->ppmu[i].hw_base = of_iomap(np, i);
if (ppmu_data->ppmu[i].hw_base == NULL) {
dev_err(&pdev->dev, "failed to map memory region\n");
return -ENOMEM;
}
}
data->pm_notifier.notifier_call = exynos5_busfreq_int_pm_notifier_event;
data->dev = dev;
mutex_init(&data->lock);
err = exynos5250_init_int_tables(data);
if (err)
return err;
data->vdd_int = devm_regulator_get(dev, "vdd_int");
if (IS_ERR(data->vdd_int)) {
dev_err(dev, "Cannot get the regulator \"vdd_int\"\n");
return PTR_ERR(data->vdd_int);
}
data->int_clk = devm_clk_get(dev, "int_clk");
if (IS_ERR(data->int_clk)) {
dev_err(dev, "Cannot get clock \"int_clk\"\n");
return PTR_ERR(data->int_clk);
}
rcu_read_lock();
opp = dev_pm_opp_find_freq_floor(dev,
&exynos5_devfreq_int_profile.initial_freq);
if (IS_ERR(opp)) {
rcu_read_unlock();
dev_err(dev, "Invalid initial frequency %lu kHz.\n",
exynos5_devfreq_int_profile.initial_freq);
return PTR_ERR(opp);
}
initial_freq = dev_pm_opp_get_freq(opp);
initial_volt = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
data->curr_freq = initial_freq;
err = clk_set_rate(data->int_clk, initial_freq * 1000);
if (err) {
dev_err(dev, "Failed to set initial frequency\n");
return err;
}
err = exynos5_int_setvolt(data, initial_volt);
if (err)
return err;
platform_set_drvdata(pdev, data);
busfreq_mon_reset(ppmu_data);
data->devfreq = devm_devfreq_add_device(dev, &exynos5_devfreq_int_profile,
"simple_ondemand", NULL);
if (IS_ERR(data->devfreq))
return PTR_ERR(data->devfreq);
err = devm_devfreq_register_opp_notifier(dev, data->devfreq);
if (err < 0) {
dev_err(dev, "Failed to register opp notifier\n");
return err;
}
err = register_pm_notifier(&data->pm_notifier);
if (err) {
dev_err(dev, "Failed to setup pm notifier\n");
return err;
}
/* TODO: Add a new QOS class for int/mif bus */
pm_qos_add_request(&data->int_req, PM_QOS_NETWORK_THROUGHPUT, -1);
return 0;
}
static int exynos5_busfreq_int_remove(struct platform_device *pdev)
{
struct busfreq_data_int *data = platform_get_drvdata(pdev);
pm_qos_remove_request(&data->int_req);
unregister_pm_notifier(&data->pm_notifier);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int exynos5_busfreq_int_resume(struct device *dev)
{
struct platform_device *pdev = container_of(dev, struct platform_device,
dev);
struct busfreq_data_int *data = platform_get_drvdata(pdev);
struct busfreq_ppmu_data *ppmu_data = &data->ppmu_data;
busfreq_mon_reset(ppmu_data);
return 0;
}
static const struct dev_pm_ops exynos5_busfreq_int_pm = {
.resume = exynos5_busfreq_int_resume,
};
#endif
static SIMPLE_DEV_PM_OPS(exynos5_busfreq_int_pm_ops, NULL,
exynos5_busfreq_int_resume);
/* platform device pointer for exynos5 devfreq device. */
static struct platform_device *exynos5_devfreq_pdev;
static struct platform_driver exynos5_busfreq_int_driver = {
.probe = exynos5_busfreq_int_probe,
.remove = exynos5_busfreq_int_remove,
.driver = {
.name = "exynos5-bus-int",
.pm = &exynos5_busfreq_int_pm_ops,
},
};
static int __init exynos5_busfreq_int_init(void)
{
int ret;
ret = platform_driver_register(&exynos5_busfreq_int_driver);
if (ret < 0)
goto out;
exynos5_devfreq_pdev =
platform_device_register_simple("exynos5-bus-int", -1, NULL, 0);
if (IS_ERR(exynos5_devfreq_pdev)) {
ret = PTR_ERR(exynos5_devfreq_pdev);
goto out1;
}
return 0;
out1:
platform_driver_unregister(&exynos5_busfreq_int_driver);
out:
return ret;
}
late_initcall(exynos5_busfreq_int_init);
static void __exit exynos5_busfreq_int_exit(void)
{
platform_device_unregister(exynos5_devfreq_pdev);
platform_driver_unregister(&exynos5_busfreq_int_driver);
}
module_exit(exynos5_busfreq_int_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("EXYNOS5 busfreq driver with devfreq framework");

119
drivers/devfreq/exynos/exynos_ppmu.c
View File

@ -1,119 +0,0 @@
/*
* Copyright (c) 2012 Samsung Electronics Co., Ltd.
* http://www.samsung.com/
*
* EXYNOS - PPMU support
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/io.h>
#include "exynos_ppmu.h"
void exynos_ppmu_reset(void __iomem *ppmu_base)
{
__raw_writel(PPMU_CYCLE_RESET | PPMU_COUNTER_RESET, ppmu_base);
__raw_writel(PPMU_ENABLE_CYCLE |
PPMU_ENABLE_COUNT0 |
PPMU_ENABLE_COUNT1 |
PPMU_ENABLE_COUNT2 |
PPMU_ENABLE_COUNT3,
ppmu_base + PPMU_CNTENS);
}
void exynos_ppmu_setevent(void __iomem *ppmu_base, unsigned int ch,
unsigned int evt)
{
__raw_writel(evt, ppmu_base + PPMU_BEVTSEL(ch));
}
void exynos_ppmu_start(void __iomem *ppmu_base)
{
__raw_writel(PPMU_ENABLE, ppmu_base);
}
void exynos_ppmu_stop(void __iomem *ppmu_base)
{
__raw_writel(PPMU_DISABLE, ppmu_base);
}
unsigned int exynos_ppmu_read(void __iomem *ppmu_base, unsigned int ch)
{
unsigned int total;
if (ch == PPMU_PMNCNT3)
total = ((__raw_readl(ppmu_base + PMCNT_OFFSET(ch)) << 8) |
__raw_readl(ppmu_base + PMCNT_OFFSET(ch + 1)));
else
total = __raw_readl(ppmu_base + PMCNT_OFFSET(ch));
return total;
}
void busfreq_mon_reset(struct busfreq_ppmu_data *ppmu_data)
{
unsigned int i;
for (i = 0; i < ppmu_data->ppmu_end; i++) {
void __iomem *ppmu_base = ppmu_data->ppmu[i].hw_base;
/* Reset the performance and cycle counters */
exynos_ppmu_reset(ppmu_base);
/* Setup count registers to monitor read/write transactions */
ppmu_data->ppmu[i].event[PPMU_PMNCNT3] = RDWR_DATA_COUNT;
exynos_ppmu_setevent(ppmu_base, PPMU_PMNCNT3,
ppmu_data->ppmu[i].event[PPMU_PMNCNT3]);
exynos_ppmu_start(ppmu_base);
}
}
EXPORT_SYMBOL(busfreq_mon_reset);
void exynos_read_ppmu(struct busfreq_ppmu_data *ppmu_data)
{
int i, j;
for (i = 0; i < ppmu_data->ppmu_end; i++) {
void __iomem *ppmu_base = ppmu_data->ppmu[i].hw_base;
exynos_ppmu_stop(ppmu_base);
/* Update local data from PPMU */
ppmu_data->ppmu[i].ccnt = __raw_readl(ppmu_base + PPMU_CCNT);
for (j = PPMU_PMNCNT0; j < PPMU_PMNCNT_MAX; j++) {
if (ppmu_data->ppmu[i].event[j] == 0)
ppmu_data->ppmu[i].count[j] = 0;
else
ppmu_data->ppmu[i].count[j] =
exynos_ppmu_read(ppmu_base, j);
}
}
busfreq_mon_reset(ppmu_data);
}
EXPORT_SYMBOL(exynos_read_ppmu);
int exynos_get_busier_ppmu(struct busfreq_ppmu_data *ppmu_data)
{
unsigned int count = 0;
int i, j, busy = 0;
for (i = 0; i < ppmu_data->ppmu_end; i++) {
for (j = PPMU_PMNCNT0; j < PPMU_PMNCNT_MAX; j++) {
if (ppmu_data->ppmu[i].count[j] > count) {
count = ppmu_data->ppmu[i].count[j];
busy = i;
}
}
}
return busy;
}
EXPORT_SYMBOL(exynos_get_busier_ppmu);

86
drivers/devfreq/exynos/exynos_ppmu.h
View File

@ -1,86 +0,0 @@
/*
* Copyright (c) 2012 Samsung Electronics Co., Ltd.
* http://www.samsung.com/
*
* EXYNOS PPMU header
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __DEVFREQ_EXYNOS_PPMU_H
#define __DEVFREQ_EXYNOS_PPMU_H __FILE__
#include <linux/ktime.h>
/* For PPMU Control */
#define PPMU_ENABLE BIT(0)
#define PPMU_DISABLE 0x0
#define PPMU_CYCLE_RESET BIT(1)
#define PPMU_COUNTER_RESET BIT(2)
#define PPMU_ENABLE_COUNT0 BIT(0)
#define PPMU_ENABLE_COUNT1 BIT(1)
#define PPMU_ENABLE_COUNT2 BIT(2)
#define PPMU_ENABLE_COUNT3 BIT(3)
#define PPMU_ENABLE_CYCLE BIT(31)
#define PPMU_CNTENS 0x10
#define PPMU_FLAG 0x50
#define PPMU_CCNT_OVERFLOW BIT(31)
#define PPMU_CCNT 0x100
#define PPMU_PMCNT0 0x110
#define PPMU_PMCNT_OFFSET 0x10
#define PMCNT_OFFSET(x) (PPMU_PMCNT0 + (PPMU_PMCNT_OFFSET * x))
#define PPMU_BEVT0SEL 0x1000
#define PPMU_BEVTSEL_OFFSET 0x100
#define PPMU_BEVTSEL(x) (PPMU_BEVT0SEL + (ch * PPMU_BEVTSEL_OFFSET))
/* For Event Selection */
#define RD_DATA_COUNT 0x5
#define WR_DATA_COUNT 0x6
#define RDWR_DATA_COUNT 0x7
enum ppmu_counter {
PPMU_PMNCNT0,
PPMU_PMCCNT1,
PPMU_PMNCNT2,
PPMU_PMNCNT3,
PPMU_PMNCNT_MAX,
};
struct bus_opp_table {
unsigned int idx;
unsigned long clk;
unsigned long volt;
};
struct exynos_ppmu {
void __iomem *hw_base;
unsigned int ccnt;
unsigned int event[PPMU_PMNCNT_MAX];
unsigned int count[PPMU_PMNCNT_MAX];
unsigned long long ns;
ktime_t reset_time;
bool ccnt_overflow;
bool count_overflow[PPMU_PMNCNT_MAX];
};
struct busfreq_ppmu_data {
struct exynos_ppmu *ppmu;
int ppmu_end;
};
void exynos_ppmu_reset(void __iomem *ppmu_base);
void exynos_ppmu_setevent(void __iomem *ppmu_base, unsigned int ch,
unsigned int evt);
void exynos_ppmu_start(void __iomem *ppmu_base);
void exynos_ppmu_stop(void __iomem *ppmu_base);
unsigned int exynos_ppmu_read(void __iomem *ppmu_base, unsigned int ch);
void busfreq_mon_reset(struct busfreq_ppmu_data *ppmu_data);
void exynos_read_ppmu(struct busfreq_ppmu_data *ppmu_data);
int exynos_get_busier_ppmu(struct busfreq_ppmu_data *ppmu_data);
#endif /* __DEVFREQ_EXYNOS_PPMU_H */

205
drivers/devfreq/governor_passive.c Normal file
View File

@ -0,0 +1,205 @@
/*
* linux/drivers/devfreq/governor_passive.c
*
* Copyright (C) 2016 Samsung Electronics
* Author: Chanwoo Choi <cw00.choi@samsung.com>
* Author: MyungJoo Ham <myungjoo.ham@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/device.h>
#include <linux/devfreq.h>
#include "governor.h"
static int devfreq_passive_get_target_freq(struct devfreq *devfreq,
unsigned long *freq)
{
struct devfreq_passive_data *p_data
= (struct devfreq_passive_data *)devfreq->data;
struct devfreq *parent_devfreq = (struct devfreq *)p_data->parent;
unsigned long child_freq = ULONG_MAX;
struct dev_pm_opp *opp;
int i, count, ret = 0;
/*
* If the devfreq device with passive governor has the specific method
* to determine the next frequency, should use the get_target_freq()
* of struct devfreq_passive_data.
*/
if (p_data->get_target_freq) {
ret = p_data->get_target_freq(devfreq, freq);
goto out;
}
/*
* If the parent and passive devfreq device uses the OPP table,
* get the next frequency by using the OPP table.
*/
/*
* - parent devfreq device uses the governors except for passive.
* - passive devfreq device uses the passive governor.
*
* Each devfreq has the OPP table. After deciding the new frequency
* from the governor of parent devfreq device, the passive governor
* need to get the index of new frequency on OPP table of parent
* device. And then the index is used for getting the suitable
* new frequency for passive devfreq device.
*/
if (!devfreq->profile || !devfreq->profile->freq_table
|| devfreq->profile->max_state <= 0)
return -EINVAL;
/*
* The passive governor have to get the correct frequency from OPP
* list of parent device. Because in this case, *freq is temporary
* value which is decided by ondemand governor.
*/
rcu_read_lock();
opp = devfreq_recommended_opp(parent_devfreq->dev.parent, freq, 0);
rcu_read_unlock();
if (IS_ERR(opp)) {
ret = PTR_ERR(opp);
goto out;
}
/*
* Get the OPP table's index of decided freqeuncy by governor
* of parent device.
*/
for (i = 0; i < parent_devfreq->profile->max_state; i++)
if (parent_devfreq->profile->freq_table[i] == *freq)
break;
if (i == parent_devfreq->profile->max_state) {
ret = -EINVAL;
goto out;
}
/* Get the suitable frequency by using index of parent device. */
if (i < devfreq->profile->max_state) {
child_freq = devfreq->profile->freq_table[i];
} else {
count = devfreq->profile->max_state;
child_freq = devfreq->profile->freq_table[count - 1];
}
/* Return the suitable frequency for passive device. */
*freq = child_freq;
out:
return ret;
}
static int update_devfreq_passive(struct devfreq *devfreq, unsigned long freq)
{
int ret;
if (!devfreq->governor)
return -EINVAL;
mutex_lock_nested(&devfreq->lock, SINGLE_DEPTH_NESTING);
ret = devfreq->governor->get_target_freq(devfreq, &freq);
if (ret < 0)
goto out;
ret = devfreq->profile->target(devfreq->dev.parent, &freq, 0);
if (ret < 0)
goto out;
devfreq->previous_freq = freq;
out:
mutex_unlock(&devfreq->lock);
return 0;
}
static int devfreq_passive_notifier_call(struct notifier_block *nb,
unsigned long event, void *ptr)
{
struct devfreq_passive_data *data
= container_of(nb, struct devfreq_passive_data, nb);
struct devfreq *devfreq = (struct devfreq *)data->this;
struct devfreq *parent = (struct devfreq *)data->parent;
struct devfreq_freqs *freqs = (struct devfreq_freqs *)ptr;
unsigned long freq = freqs->new;
switch (event) {
case DEVFREQ_PRECHANGE:
if (parent->previous_freq > freq)
update_devfreq_passive(devfreq, freq);
break;
case DEVFREQ_POSTCHANGE:
if (parent->previous_freq < freq)
update_devfreq_passive(devfreq, freq);
break;
}
return NOTIFY_DONE;
}
static int devfreq_passive_event_handler(struct devfreq *devfreq,
unsigned int event, void *data)
{
struct device *dev = devfreq->dev.parent;
struct devfreq_passive_data *p_data
= (struct devfreq_passive_data *)devfreq->data;
struct devfreq *parent = (struct devfreq *)p_data->parent;
struct notifier_block *nb = &p_data->nb;
int ret = 0;
if (!parent)
return -EPROBE_DEFER;
switch (event) {
case DEVFREQ_GOV_START:
if (!p_data->this)
p_data->this = devfreq;
nb->notifier_call = devfreq_passive_notifier_call;
ret = devm_devfreq_register_notifier(dev, parent, nb,
DEVFREQ_TRANSITION_NOTIFIER);
break;
case DEVFREQ_GOV_STOP:
devm_devfreq_unregister_notifier(dev, parent, nb,
DEVFREQ_TRANSITION_NOTIFIER);
break;
default:
break;
}
return ret;
}
static struct devfreq_governor devfreq_passive = {
.name = "passive",
.get_target_freq = devfreq_passive_get_target_freq,
.event_handler = devfreq_passive_event_handler,
};
static int __init devfreq_passive_init(void)
{
return devfreq_add_governor(&devfreq_passive);
}
subsys_initcall(devfreq_passive_init);
static void __exit devfreq_passive_exit(void)
{
int ret;
ret = devfreq_remove_governor(&devfreq_passive);
if (ret)
pr_err("%s: failed remove governor %d\n", __func__, ret);
}
module_exit(devfreq_passive_exit);
MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
MODULE_DESCRIPTION("DEVFREQ Passive governor");
MODULE_LICENSE("GPL v2");

99
include/linux/devfreq.h
View File

@ -19,6 +19,13 @@
#define DEVFREQ_NAME_LEN 16
/* DEVFREQ notifier interface */
#define DEVFREQ_TRANSITION_NOTIFIER (0)
/* Transition notifiers of DEVFREQ_TRANSITION_NOTIFIER */
#define DEVFREQ_PRECHANGE (0)
#define DEVFREQ_POSTCHANGE (1)
struct devfreq;
/**
@ -143,6 +150,7 @@ struct devfreq_governor {
* @trans_table: Statistics of devfreq transitions
* @time_in_state: Statistics of devfreq states
* @last_stat_updated: The last time stat updated
* @transition_notifier_list: list head of DEVFREQ_TRANSITION_NOTIFIER notifier
*
* This structure stores the devfreq information for a give device.
*
@ -177,6 +185,13 @@ struct devfreq {
unsigned int *trans_table;
unsigned long *time_in_state;
unsigned long last_stat_updated;
struct srcu_notifier_head transition_notifier_list;
};
struct devfreq_freqs {
unsigned long old;
unsigned long new;
};
#if defined(CONFIG_PM_DEVFREQ)
@ -207,6 +222,22 @@ extern int devm_devfreq_register_opp_notifier(struct device *dev,
struct devfreq *devfreq);
extern void devm_devfreq_unregister_opp_notifier(struct device *dev,
struct devfreq *devfreq);
extern int devfreq_register_notifier(struct devfreq *devfreq,
struct notifier_block *nb,
unsigned int list);
extern int devfreq_unregister_notifier(struct devfreq *devfreq,
struct notifier_block *nb,
unsigned int list);
extern int devm_devfreq_register_notifier(struct device *dev,
struct devfreq *devfreq,
struct notifier_block *nb,
unsigned int list);
extern void devm_devfreq_unregister_notifier(struct device *dev,
struct devfreq *devfreq,
struct notifier_block *nb,
unsigned int list);
extern struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev,
int index);
/**
* devfreq_update_stats() - update the last_status pointer in struct devfreq
@ -241,6 +272,39 @@ struct devfreq_simple_ondemand_data {
};
#endif
#if IS_ENABLED(CONFIG_DEVFREQ_GOV_PASSIVE)
/**
* struct devfreq_passive_data - void *data fed to struct devfreq
* and devfreq_add_device
* @parent: the devfreq instance of parent device.
* @get_target_freq: Optional callback, Returns desired operating frequency
* for the device using passive governor. That is called
* when passive governor should decide the next frequency
* by using the new frequency of parent devfreq device
* using governors except for passive governor.
* If the devfreq device has the specific method to decide
* the next frequency, should use this callback.
* @this: the devfreq instance of own device.
* @nb: the notifier block for DEVFREQ_TRANSITION_NOTIFIER list
*
* The devfreq_passive_data have to set the devfreq instance of parent
* device with governors except for the passive governor. But, don't need to
* initialize the 'this' and 'nb' field because the devfreq core will handle
* them.
*/
struct devfreq_passive_data {
/* Should set the devfreq instance of parent device */
struct devfreq *parent;
/* Optional callback to decide the next frequency of passvice device */
int (*get_target_freq)(struct devfreq *this, unsigned long *freq);
/* For passive governor's internal use. Don't need to set them */
struct devfreq *this;
struct notifier_block nb;
};
#endif
#else /* !CONFIG_PM_DEVFREQ */
static inline struct devfreq *devfreq_add_device(struct device *dev,
struct devfreq_dev_profile *profile,
@ -307,6 +371,41 @@ static inline void devm_devfreq_unregister_opp_notifier(struct device *dev,
{
}
static inline int devfreq_register_notifier(struct devfreq *devfreq,
struct notifier_block *nb,
unsigned int list)
{
return 0;
}
static inline int devfreq_unregister_notifier(struct devfreq *devfreq,
struct notifier_block *nb,
unsigned int list)
{
return 0;
}
static inline int devm_devfreq_register_notifier(struct device *dev,
struct devfreq *devfreq,
struct notifier_block *nb,
unsigned int list)
{
return 0;
}
static inline void devm_devfreq_unregister_notifier(struct device *dev,
struct devfreq *devfreq,
struct notifier_block *nb,
unsigned int list)
{
}
static inline struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev,
int index)
{
return ERR_PTR(-ENODEV);
}
static inline int devfreq_update_stats(struct devfreq *df)
{
return -EINVAL;