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linux-next/drivers/devfreq/event/exynos-ppmu.c
Kees Cook a86854d0c5 treewide: devm_kzalloc() -> devm_kcalloc() 
The devm_kzalloc() function has a 2-factor argument form, devm_kcalloc().
This patch replaces cases of:

        devm_kzalloc(handle, a * b, gfp)

with:
        devm_kcalloc(handle, a * b, gfp)

as well as handling cases of:

        devm_kzalloc(handle, a * b * c, gfp)

with:

        devm_kzalloc(handle, array3_size(a, b, c), gfp)

as it's slightly less ugly than:

        devm_kcalloc(handle, array_size(a, b), c, gfp)

This does, however, attempt to ignore constant size factors like:

        devm_kzalloc(handle, 4 * 1024, gfp)

though any constants defined via macros get caught up in the conversion.

Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.

Some manual whitespace fixes were needed in this patch, as Coccinelle
really liked to write "=devm_kcalloc..." instead of "= devm_kcalloc...".

The Coccinelle script used for this was:

// Fix redundant parens around sizeof().
@@
expression HANDLE;
type TYPE;
expression THING, E;
@@

(
  devm_kzalloc(HANDLE,
-	(sizeof(TYPE)) * E
+	sizeof(TYPE) * E
  , ...)
|
  devm_kzalloc(HANDLE,
-	(sizeof(THING)) * E
+	sizeof(THING) * E
  , ...)
)

// Drop single-byte sizes and redundant parens.
@@
expression HANDLE;
expression COUNT;
typedef u8;
typedef __u8;
@@

(
  devm_kzalloc(HANDLE,
-	sizeof(u8) * (COUNT)
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(__u8) * (COUNT)
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(char) * (COUNT)
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(unsigned char) * (COUNT)
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(u8) * COUNT
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(__u8) * COUNT
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(char) * COUNT
+	COUNT
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(unsigned char) * COUNT
+	COUNT
  , ...)
)

// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
expression HANDLE;
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@

(
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * (COUNT_ID)
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * COUNT_ID
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * (COUNT_CONST)
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * COUNT_CONST
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * (COUNT_ID)
+	COUNT_ID, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * COUNT_ID
+	COUNT_ID, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * (COUNT_CONST)
+	COUNT_CONST, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * COUNT_CONST
+	COUNT_CONST, sizeof(THING)
  , ...)
)

// 2-factor product, only identifiers.
@@
expression HANDLE;
identifier SIZE, COUNT;
@@

- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	SIZE * COUNT
+	COUNT, SIZE
  , ...)

// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression HANDLE;
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@

(
  devm_kzalloc(HANDLE,
-	sizeof(TYPE) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
)

// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression HANDLE;
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@

(
  devm_kzalloc(HANDLE,
-	sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(THING1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
|
  devm_kzalloc(HANDLE,
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
)

// 3-factor product, only identifiers, with redundant parens removed.
@@
expression HANDLE;
identifier STRIDE, SIZE, COUNT;
@@

(
  devm_kzalloc(HANDLE,
-	(COUNT) * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	COUNT * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	COUNT * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(COUNT) * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	COUNT * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(COUNT) * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(COUNT) * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  devm_kzalloc(HANDLE,
-	COUNT * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
)

// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression HANDLE;
expression E1, E2, E3;
constant C1, C2, C3;
@@

(
  devm_kzalloc(HANDLE, C1 * C2 * C3, ...)
|
  devm_kzalloc(HANDLE,
-	(E1) * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(E1) * (E2) * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  devm_kzalloc(HANDLE,
-	(E1) * (E2) * (E3)
+	array3_size(E1, E2, E3)
  , ...)
|
  devm_kzalloc(HANDLE,
-	E1 * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
)

// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression HANDLE;
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@

(
  devm_kzalloc(HANDLE, sizeof(THING) * C2, ...)
|
  devm_kzalloc(HANDLE, sizeof(TYPE) * C2, ...)
|
  devm_kzalloc(HANDLE, C1 * C2 * C3, ...)
|
  devm_kzalloc(HANDLE, C1 * C2, ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * (E2)
+	E2, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(TYPE) * E2
+	E2, sizeof(TYPE)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * (E2)
+	E2, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	sizeof(THING) * E2
+	E2, sizeof(THING)
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	(E1) * E2
+	E1, E2
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	(E1) * (E2)
+	E1, E2
  , ...)
|
- devm_kzalloc
+ devm_kcalloc
  (HANDLE,
-	E1 * E2
+	E1, E2
  , ...)
)

Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 16:19:22 -07:00

682 lines
16 KiB
C
Raw Blame History

/*
* exynos_ppmu.c - EXYNOS PPMU (Platform Performance Monitoring Unit) support
*
* Copyright (c) 2014-2015 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.
*
* This driver is based on drivers/devfreq/exynos/exynos_ppmu.c
*/
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/suspend.h>
#include <linux/devfreq-event.h>
#include "exynos-ppmu.h"
struct exynos_ppmu_data {
struct clk *clk;
};
struct exynos_ppmu {
struct devfreq_event_dev **edev;
struct devfreq_event_desc *desc;
unsigned int num_events;
struct device *dev;
struct regmap *regmap;
struct exynos_ppmu_data ppmu;
};
#define PPMU_EVENT(name) \
{ "ppmu-event0-"#name, PPMU_PMNCNT0 }, \
{ "ppmu-event1-"#name, PPMU_PMNCNT1 }, \
{ "ppmu-event2-"#name, PPMU_PMNCNT2 }, \
{ "ppmu-event3-"#name, PPMU_PMNCNT3 }
static struct __exynos_ppmu_events {
char *name;
int id;
} ppmu_events[] = {
/* For Exynos3250, Exynos4 and Exynos5260 */
PPMU_EVENT(g3d),
PPMU_EVENT(fsys),
/* For Exynos4 SoCs and Exynos3250 */
PPMU_EVENT(dmc0),
PPMU_EVENT(dmc1),
PPMU_EVENT(cpu),
PPMU_EVENT(rightbus),
PPMU_EVENT(leftbus),
PPMU_EVENT(lcd0),
PPMU_EVENT(camif),
/* Only for Exynos3250 and Exynos5260 */
PPMU_EVENT(mfc),
/* Only for Exynos4 SoCs */
PPMU_EVENT(mfc-left),
PPMU_EVENT(mfc-right),
/* Only for Exynos5260 SoCs */
PPMU_EVENT(drex0-s0),
PPMU_EVENT(drex0-s1),
PPMU_EVENT(drex1-s0),
PPMU_EVENT(drex1-s1),
PPMU_EVENT(eagle),
PPMU_EVENT(kfc),
PPMU_EVENT(isp),
PPMU_EVENT(fimc),
PPMU_EVENT(gscl),
PPMU_EVENT(mscl),
PPMU_EVENT(fimd0x),
PPMU_EVENT(fimd1x),
/* Only for Exynos5433 SoCs */
PPMU_EVENT(d0-cpu),
PPMU_EVENT(d0-general),
PPMU_EVENT(d0-rt),
PPMU_EVENT(d1-cpu),
PPMU_EVENT(d1-general),
PPMU_EVENT(d1-rt),
};
static int exynos_ppmu_find_ppmu_id(struct devfreq_event_dev *edev)
{
int i;
for (i = 0; i < ARRAY_SIZE(ppmu_events); i++)
if (!strcmp(edev->desc->name, ppmu_events[i].name))
return ppmu_events[i].id;
return -EINVAL;
}
/*
* The devfreq-event ops structure for PPMU v1.1
*/
static int exynos_ppmu_disable(struct devfreq_event_dev *edev)
{
struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
int ret;
u32 pmnc;
/* Disable all counters */
ret = regmap_write(info->regmap, PPMU_CNTENC,
PPMU_CCNT_MASK |
PPMU_PMCNT0_MASK |
PPMU_PMCNT1_MASK |
PPMU_PMCNT2_MASK |
PPMU_PMCNT3_MASK);
if (ret < 0)
return ret;
/* Disable PPMU */
ret = regmap_read(info->regmap, PPMU_PMNC, &pmnc);
if (ret < 0)
return ret;
pmnc &= ~PPMU_PMNC_ENABLE_MASK;
ret = regmap_write(info->regmap, PPMU_PMNC, pmnc);
if (ret < 0)
return ret;
return 0;
}
static int exynos_ppmu_set_event(struct devfreq_event_dev *edev)
{
struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
int id = exynos_ppmu_find_ppmu_id(edev);
int ret;
u32 pmnc, cntens;
if (id < 0)
return id;
/* Enable specific counter */
ret = regmap_read(info->regmap, PPMU_CNTENS, &cntens);
if (ret < 0)
return ret;
cntens |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
ret = regmap_write(info->regmap, PPMU_CNTENS, cntens);
if (ret < 0)
return ret;
/* Set the event of Read/Write data count */
ret = regmap_write(info->regmap, PPMU_BEVTxSEL(id),
PPMU_RO_DATA_CNT | PPMU_WO_DATA_CNT);
if (ret < 0)
return ret;
/* Reset cycle counter/performance counter and enable PPMU */
ret = regmap_read(info->regmap, PPMU_PMNC, &pmnc);
if (ret < 0)
return ret;
pmnc &= ~(PPMU_PMNC_ENABLE_MASK
| PPMU_PMNC_COUNTER_RESET_MASK
| PPMU_PMNC_CC_RESET_MASK);
pmnc |= (PPMU_ENABLE << PPMU_PMNC_ENABLE_SHIFT);
pmnc |= (PPMU_ENABLE << PPMU_PMNC_COUNTER_RESET_SHIFT);
pmnc |= (PPMU_ENABLE << PPMU_PMNC_CC_RESET_SHIFT);
ret = regmap_write(info->regmap, PPMU_PMNC, pmnc);
if (ret < 0)
return ret;
return 0;
}
static int exynos_ppmu_get_event(struct devfreq_event_dev *edev,
struct devfreq_event_data *edata)
{
struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
int id = exynos_ppmu_find_ppmu_id(edev);
unsigned int total_count, load_count;
unsigned int pmcnt3_high, pmcnt3_low;
unsigned int pmnc, cntenc;
int ret;
if (id < 0)
return -EINVAL;
/* Disable PPMU */
ret = regmap_read(info->regmap, PPMU_PMNC, &pmnc);
if (ret < 0)
return ret;
pmnc &= ~PPMU_PMNC_ENABLE_MASK;
ret = regmap_write(info->regmap, PPMU_PMNC, pmnc);
if (ret < 0)
return ret;
/* Read cycle count */
ret = regmap_read(info->regmap, PPMU_CCNT, &total_count);
if (ret < 0)
return ret;
edata->total_count = total_count;
/* Read performance count */
switch (id) {
case PPMU_PMNCNT0:
case PPMU_PMNCNT1:
case PPMU_PMNCNT2:
ret = regmap_read(info->regmap, PPMU_PMNCT(id), &load_count);
if (ret < 0)
return ret;
edata->load_count = load_count;
break;
case PPMU_PMNCNT3:
ret = regmap_read(info->regmap, PPMU_PMCNT3_HIGH, &pmcnt3_high);
if (ret < 0)
return ret;
ret = regmap_read(info->regmap, PPMU_PMCNT3_LOW, &pmcnt3_low);
if (ret < 0)
return ret;
edata->load_count = ((pmcnt3_high << 8) | pmcnt3_low);
break;
default:
return -EINVAL;
}
/* Disable specific counter */
ret = regmap_read(info->regmap, PPMU_CNTENC, &cntenc);
if (ret < 0)
return ret;
cntenc |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
ret = regmap_write(info->regmap, PPMU_CNTENC, cntenc);
if (ret < 0)
return ret;
dev_dbg(&edev->dev, "%s (event: %ld/%ld)\n", edev->desc->name,
edata->load_count, edata->total_count);
return 0;
}
static const struct devfreq_event_ops exynos_ppmu_ops = {
.disable = exynos_ppmu_disable,
.set_event = exynos_ppmu_set_event,
.get_event = exynos_ppmu_get_event,
};
/*
* The devfreq-event ops structure for PPMU v2.0
*/
static int exynos_ppmu_v2_disable(struct devfreq_event_dev *edev)
{
struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
int ret;
u32 pmnc, clear;
/* Disable all counters */
clear = (PPMU_CCNT_MASK | PPMU_PMCNT0_MASK | PPMU_PMCNT1_MASK
| PPMU_PMCNT2_MASK | PPMU_PMCNT3_MASK);
ret = regmap_write(info->regmap, PPMU_V2_FLAG, clear);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_INTENC, clear);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_CNTENC, clear);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_CNT_RESET, clear);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_CIG_CFG0, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_CIG_CFG1, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_CIG_CFG2, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_CIG_RESULT, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_CNT_AUTO, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_CH_EV0_TYPE, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_CH_EV1_TYPE, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_CH_EV2_TYPE, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_CH_EV3_TYPE, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_SM_ID_V, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_SM_ID_A, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_SM_OTHERS_V, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_SM_OTHERS_A, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_INTERRUPT_RESET, 0x0);
if (ret < 0)
return ret;
/* Disable PPMU */
ret = regmap_read(info->regmap, PPMU_V2_PMNC, &pmnc);
if (ret < 0)
return ret;
pmnc &= ~PPMU_PMNC_ENABLE_MASK;
ret = regmap_write(info->regmap, PPMU_V2_PMNC, pmnc);
if (ret < 0)
return ret;
return 0;
}
static int exynos_ppmu_v2_set_event(struct devfreq_event_dev *edev)
{
struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
unsigned int pmnc, cntens;
int id = exynos_ppmu_find_ppmu_id(edev);
int ret;
/* Enable all counters */
ret = regmap_read(info->regmap, PPMU_V2_CNTENS, &cntens);
if (ret < 0)
return ret;
cntens |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
ret = regmap_write(info->regmap, PPMU_V2_CNTENS, cntens);
if (ret < 0)
return ret;
/* Set the event of Read/Write data count */
switch (id) {
case PPMU_PMNCNT0:
case PPMU_PMNCNT1:
case PPMU_PMNCNT2:
ret = regmap_write(info->regmap, PPMU_V2_CH_EVx_TYPE(id),
PPMU_V2_RO_DATA_CNT | PPMU_V2_WO_DATA_CNT);
if (ret < 0)
return ret;
break;
case PPMU_PMNCNT3:
ret = regmap_write(info->regmap, PPMU_V2_CH_EVx_TYPE(id),
PPMU_V2_EVT3_RW_DATA_CNT);
if (ret < 0)
return ret;
break;
}
/* Reset cycle counter/performance counter and enable PPMU */
ret = regmap_read(info->regmap, PPMU_V2_PMNC, &pmnc);
if (ret < 0)
return ret;
pmnc &= ~(PPMU_PMNC_ENABLE_MASK
| PPMU_PMNC_COUNTER_RESET_MASK
| PPMU_PMNC_CC_RESET_MASK
| PPMU_PMNC_CC_DIVIDER_MASK
| PPMU_V2_PMNC_START_MODE_MASK);
pmnc |= (PPMU_ENABLE << PPMU_PMNC_ENABLE_SHIFT);
pmnc |= (PPMU_ENABLE << PPMU_PMNC_COUNTER_RESET_SHIFT);
pmnc |= (PPMU_ENABLE << PPMU_PMNC_CC_RESET_SHIFT);
pmnc |= (PPMU_V2_MODE_MANUAL << PPMU_V2_PMNC_START_MODE_SHIFT);
ret = regmap_write(info->regmap, PPMU_V2_PMNC, pmnc);
if (ret < 0)
return ret;
return 0;
}
static int exynos_ppmu_v2_get_event(struct devfreq_event_dev *edev,
struct devfreq_event_data *edata)
{
struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
int id = exynos_ppmu_find_ppmu_id(edev);
int ret;
unsigned int pmnc, cntenc;
unsigned int pmcnt_high, pmcnt_low;
unsigned int total_count, count;
unsigned long load_count = 0;
/* Disable PPMU */
ret = regmap_read(info->regmap, PPMU_V2_PMNC, &pmnc);
if (ret < 0)
return ret;
pmnc &= ~PPMU_PMNC_ENABLE_MASK;
ret = regmap_write(info->regmap, PPMU_V2_PMNC, pmnc);
if (ret < 0)
return ret;
/* Read cycle count and performance count */
ret = regmap_read(info->regmap, PPMU_V2_CCNT, &total_count);
if (ret < 0)
return ret;
edata->total_count = total_count;
switch (id) {
case PPMU_PMNCNT0:
case PPMU_PMNCNT1:
case PPMU_PMNCNT2:
ret = regmap_read(info->regmap, PPMU_V2_PMNCT(id), &count);
if (ret < 0)
return ret;
load_count = count;
break;
case PPMU_PMNCNT3:
ret = regmap_read(info->regmap, PPMU_V2_PMCNT3_HIGH,
&pmcnt_high);
if (ret < 0)
return ret;
ret = regmap_read(info->regmap, PPMU_V2_PMCNT3_LOW, &pmcnt_low);
if (ret < 0)
return ret;
load_count = ((u64)((pmcnt_high & 0xff)) << 32)+ (u64)pmcnt_low;
break;
}
edata->load_count = load_count;
/* Disable all counters */
ret = regmap_read(info->regmap, PPMU_V2_CNTENC, &cntenc);
if (ret < 0)
return 0;
cntenc |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
ret = regmap_write(info->regmap, PPMU_V2_CNTENC, cntenc);
if (ret < 0)
return ret;
dev_dbg(&edev->dev, "%25s (load: %ld / %ld)\n", edev->desc->name,
edata->load_count, edata->total_count);
return 0;
}
static const struct devfreq_event_ops exynos_ppmu_v2_ops = {
.disable = exynos_ppmu_v2_disable,
.set_event = exynos_ppmu_v2_set_event,
.get_event = exynos_ppmu_v2_get_event,
};
static const struct of_device_id exynos_ppmu_id_match[] = {
{
.compatible = "samsung,exynos-ppmu",
.data = (void *)&exynos_ppmu_ops,
}, {
.compatible = "samsung,exynos-ppmu-v2",
.data = (void *)&exynos_ppmu_v2_ops,
},
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, exynos_ppmu_id_match);
static struct devfreq_event_ops *exynos_bus_get_ops(struct device_node *np)
{
const struct of_device_id *match;
match = of_match_node(exynos_ppmu_id_match, np);
return (struct devfreq_event_ops *)match->data;
}
static int of_get_devfreq_events(struct device_node *np,
struct exynos_ppmu *info)
{
struct devfreq_event_desc *desc;
struct devfreq_event_ops *event_ops;
struct device *dev = info->dev;
struct device_node *events_np, *node;
int i, j, count;
events_np = of_get_child_by_name(np, "events");
if (!events_np) {
dev_err(dev,
"failed to get child node of devfreq-event devices\n");
return -EINVAL;
}
event_ops = exynos_bus_get_ops(np);
count = of_get_child_count(events_np);
desc = devm_kcalloc(dev, count, sizeof(*desc), GFP_KERNEL);
if (!desc)
return -ENOMEM;
info->num_events = count;
j = 0;
for_each_child_of_node(events_np, node) {
for (i = 0; i < ARRAY_SIZE(ppmu_events); i++) {
if (!ppmu_events[i].name)
continue;
if (!of_node_cmp(node->name, ppmu_events[i].name))
break;
}
if (i == ARRAY_SIZE(ppmu_events)) {
dev_warn(dev,
"don't know how to configure events : %s\n",
node->name);
continue;
}
desc[j].ops = event_ops;
desc[j].driver_data = info;
of_property_read_string(node, "event-name", &desc[j].name);
j++;
}
info->desc = desc;
of_node_put(events_np);
return 0;
}
static struct regmap_config exynos_ppmu_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
};
static int exynos_ppmu_parse_dt(struct platform_device *pdev,
struct exynos_ppmu *info)
{
struct device *dev = info->dev;
struct device_node *np = dev->of_node;
struct resource *res;
void __iomem *base;
int ret = 0;
if (!np) {
dev_err(dev, "failed to find devicetree node\n");
return -EINVAL;
}
/* Maps the memory mapped IO to control PPMU register */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
exynos_ppmu_regmap_config.max_register = resource_size(res) - 4;
info->regmap = devm_regmap_init_mmio(dev, base,
&exynos_ppmu_regmap_config);
if (IS_ERR(info->regmap)) {
dev_err(dev, "failed to initialize regmap\n");
return PTR_ERR(info->regmap);
}
info->ppmu.clk = devm_clk_get(dev, "ppmu");
if (IS_ERR(info->ppmu.clk)) {
info->ppmu.clk = NULL;
dev_warn(dev, "cannot get PPMU clock\n");
}
ret = of_get_devfreq_events(np, info);
if (ret < 0) {
dev_err(dev, "failed to parse exynos ppmu dt node\n");
return ret;
}
return 0;
}
static int exynos_ppmu_probe(struct platform_device *pdev)
{
struct exynos_ppmu *info;
struct devfreq_event_dev **edev;
struct devfreq_event_desc *desc;
int i, ret = 0, size;
info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
info->dev = &pdev->dev;
/* Parse dt data to get resource */
ret = exynos_ppmu_parse_dt(pdev, info);
if (ret < 0) {
dev_err(&pdev->dev,
"failed to parse devicetree for resource\n");
return ret;
}
desc = info->desc;
size = sizeof(struct devfreq_event_dev *) * info->num_events;
info->edev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
if (!info->edev) {
dev_err(&pdev->dev,
"failed to allocate memory devfreq-event devices\n");
return -ENOMEM;
}
edev = info->edev;
platform_set_drvdata(pdev, info);
for (i = 0; i < info->num_events; i++) {
edev[i] = devm_devfreq_event_add_edev(&pdev->dev, &desc[i]);
if (IS_ERR(edev[i])) {
ret = PTR_ERR(edev[i]);
dev_err(&pdev->dev,
"failed to add devfreq-event device\n");
return PTR_ERR(edev[i]);
}
pr_info("exynos-ppmu: new PPMU device registered %s (%s)\n",
dev_name(&pdev->dev), desc[i].name);
}
ret = clk_prepare_enable(info->ppmu.clk);
if (ret) {
dev_err(&pdev->dev, "failed to prepare ppmu clock\n");
return ret;
}
return 0;
}
static int exynos_ppmu_remove(struct platform_device *pdev)
{
struct exynos_ppmu *info = platform_get_drvdata(pdev);
clk_disable_unprepare(info->ppmu.clk);
return 0;
}
static struct platform_driver exynos_ppmu_driver = {
.probe = exynos_ppmu_probe,
.remove = exynos_ppmu_remove,
.driver = {
.name = "exynos-ppmu",
.of_match_table = exynos_ppmu_id_match,
},
};
module_platform_driver(exynos_ppmu_driver);
MODULE_DESCRIPTION("Exynos PPMU(Platform Performance Monitoring Unit) driver");
MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
MODULE_LICENSE("GPL");
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