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PM / devfreq: exynos-ppmu: Add the support of PPMUv2 for Exynos5433
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This patch adds the support for PPMU (Platform Performance Monitoring Unit)
version 2.0 for Exynos5433 SoC. Exynos5433 SoC must need PPMUv2 which is
quite different from PPMUv1.1. The exynos-ppmu.c driver supports both PPMUv1.1
and PPMUv2.

Cc: MyungJoo Ham <myungjoo.ham@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
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Chanwoo Choi authored and MyungJoo Ham committed Sep 11, 2015
1 parent f47ff87 commit 77fe46a
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Showing 2 changed files with 233 additions and 7 deletions.
170 changes: 163 additions & 7 deletions drivers/devfreq/event/exynos-ppmu.c
View file
Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
/*
* exynos_ppmu.c - EXYNOS PPMU (Platform Performance Monitoring Unit) support
*
* Copyright (c) 2014 Samsung Electronics Co., Ltd.
* 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
Expand Down Expand Up @@ -82,6 +82,15 @@ struct __exynos_ppmu_events {
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),

{ /* sentinel */ },
};

Expand All @@ -96,6 +105,9 @@ static int exynos_ppmu_find_ppmu_id(struct devfreq_event_dev *edev)
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);
Expand Down Expand Up @@ -200,10 +212,158 @@ static const struct devfreq_event_ops exynos_ppmu_ops = {
.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);
u32 pmnc, clear;

/* Disable all counters */
clear = (PPMU_CCNT_MASK | PPMU_PMCNT0_MASK | PPMU_PMCNT1_MASK
| PPMU_PMCNT2_MASK | PPMU_PMCNT3_MASK);

__raw_writel(clear, info->ppmu.base + PPMU_V2_FLAG);
__raw_writel(clear, info->ppmu.base + PPMU_V2_INTENC);
__raw_writel(clear, info->ppmu.base + PPMU_V2_CNTENC);
__raw_writel(clear, info->ppmu.base + PPMU_V2_CNT_RESET);

__raw_writel(0x0, info->ppmu.base + PPMU_V2_CIG_CFG0);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_CIG_CFG1);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_CIG_CFG2);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_CIG_RESULT);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_CNT_AUTO);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_CH_EV0_TYPE);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_CH_EV1_TYPE);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_CH_EV2_TYPE);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_CH_EV3_TYPE);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_SM_ID_V);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_SM_ID_A);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_SM_OTHERS_V);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_SM_OTHERS_A);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_INTERRUPT_RESET);

/* Disable PPMU */
pmnc = __raw_readl(info->ppmu.base + PPMU_V2_PMNC);
pmnc &= ~PPMU_PMNC_ENABLE_MASK;
__raw_writel(pmnc, info->ppmu.base + PPMU_V2_PMNC);

return 0;
}

static int exynos_ppmu_v2_set_event(struct devfreq_event_dev *edev)
{
struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
int id = exynos_ppmu_find_ppmu_id(edev);
u32 pmnc, cntens;

/* Enable all counters */
cntens = __raw_readl(info->ppmu.base + PPMU_V2_CNTENS);
cntens |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
__raw_writel(cntens, info->ppmu.base + PPMU_V2_CNTENS);

/* Set the event of Read/Write data count */
switch (id) {
case PPMU_PMNCNT0:
case PPMU_PMNCNT1:
case PPMU_PMNCNT2:
__raw_writel(PPMU_V2_RO_DATA_CNT | PPMU_V2_WO_DATA_CNT,
info->ppmu.base + PPMU_V2_CH_EVx_TYPE(id));
break;
case PPMU_PMNCNT3:
__raw_writel(PPMU_V2_EVT3_RW_DATA_CNT,
info->ppmu.base + PPMU_V2_CH_EVx_TYPE(id));
break;
}

/* Reset cycle counter/performance counter and enable PPMU */
pmnc = __raw_readl(info->ppmu.base + PPMU_V2_PMNC);
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);
__raw_writel(pmnc, info->ppmu.base + PPMU_V2_PMNC);

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);
u32 pmnc, cntenc;
u32 pmcnt_high, pmcnt_low;
u64 load_count = 0;

/* Disable PPMU */
pmnc = __raw_readl(info->ppmu.base + PPMU_V2_PMNC);
pmnc &= ~PPMU_PMNC_ENABLE_MASK;
__raw_writel(pmnc, info->ppmu.base + PPMU_V2_PMNC);

/* Read cycle count and performance count */
edata->total_count = __raw_readl(info->ppmu.base + PPMU_V2_CCNT);

switch (id) {
case PPMU_PMNCNT0:
case PPMU_PMNCNT1:
case PPMU_PMNCNT2:
load_count = __raw_readl(info->ppmu.base + PPMU_V2_PMNCT(id));
break;
case PPMU_PMNCNT3:
pmcnt_high = __raw_readl(info->ppmu.base + PPMU_V2_PMCNT3_HIGH);
pmcnt_low = __raw_readl(info->ppmu.base + PPMU_V2_PMCNT3_LOW);
load_count = (u64)((pmcnt_high & 0xff) << 32) + (u64)pmcnt_low;
break;
}
edata->load_count = load_count;

/* Disable all counters */
cntenc = __raw_readl(info->ppmu.base + PPMU_V2_CNTENC);
cntenc |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
__raw_writel(cntenc, info->ppmu.base + PPMU_V2_CNTENC);

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 */ },
};

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;
Expand All @@ -214,6 +374,7 @@ static int of_get_devfreq_events(struct device_node *np,
"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_kzalloc(dev, sizeof(*desc) * count, GFP_KERNEL);
Expand All @@ -238,7 +399,7 @@ static int of_get_devfreq_events(struct device_node *np,
continue;
}

desc[j].ops = &exynos_ppmu_ops;
desc[j].ops = event_ops;
desc[j].driver_data = info;

of_property_read_string(node, "event-name", &desc[j].name);
Expand Down Expand Up @@ -354,11 +515,6 @@ static int exynos_ppmu_remove(struct platform_device *pdev)
return 0;
}

static struct of_device_id exynos_ppmu_id_match[] = {
{ .compatible = "samsung,exynos-ppmu", },
{ /* sentinel */ },
};

static struct platform_driver exynos_ppmu_driver = {
.probe = exynos_ppmu_probe,
.remove = exynos_ppmu_remove,
Expand Down
70 changes: 70 additions & 0 deletions drivers/devfreq/event/exynos-ppmu.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,9 @@ enum ppmu_counter {
PPMU_PMNCNT_MAX,
};

/***
* PPMUv1.1 Definitions
*/
enum ppmu_event_type {
PPMU_RO_BUSY_CYCLE_CNT = 0x0,
PPMU_WO_BUSY_CYCLE_CNT = 0x1,
Expand Down Expand Up @@ -90,4 +93,71 @@ enum ppmu_reg {
#define PPMU_PMNCT(x) (PPMU_PMCNT0 + (0x10 * x))
#define PPMU_BEVTxSEL(x) (PPMU_BEVT0SEL + (0x100 * x))

/***
* PPMU_V2.0 definitions
*/
enum ppmu_v2_mode {
PPMU_V2_MODE_MANUAL = 0,
PPMU_V2_MODE_AUTO = 1,
PPMU_V2_MODE_CIG = 2, /* CIG (Conditional Interrupt Generation) */
};

enum ppmu_v2_event_type {
PPMU_V2_RO_DATA_CNT = 0x4,
PPMU_V2_WO_DATA_CNT = 0x5,

PPMU_V2_EVT3_RW_DATA_CNT = 0x22, /* Only for Event3 */
};

enum ppmu_V2_reg {
/* PPC control register */
PPMU_V2_PMNC = 0x04,
PPMU_V2_CNTENS = 0x08,
PPMU_V2_CNTENC = 0x0c,
PPMU_V2_INTENS = 0x10,
PPMU_V2_INTENC = 0x14,
PPMU_V2_FLAG = 0x18,

/* Cycle Counter and Performance Event Counter Register */
PPMU_V2_CCNT = 0x48,
PPMU_V2_PMCNT0 = 0x34,
PPMU_V2_PMCNT1 = 0x38,
PPMU_V2_PMCNT2 = 0x3c,
PPMU_V2_PMCNT3_LOW = 0x40,
PPMU_V2_PMCNT3_HIGH = 0x44,

/* Bus Event Generator */
PPMU_V2_CIG_CFG0 = 0x1c,
PPMU_V2_CIG_CFG1 = 0x20,
PPMU_V2_CIG_CFG2 = 0x24,
PPMU_V2_CIG_RESULT = 0x28,
PPMU_V2_CNT_RESET = 0x2c,
PPMU_V2_CNT_AUTO = 0x30,
PPMU_V2_CH_EV0_TYPE = 0x200,
PPMU_V2_CH_EV1_TYPE = 0x204,
PPMU_V2_CH_EV2_TYPE = 0x208,
PPMU_V2_CH_EV3_TYPE = 0x20c,
PPMU_V2_SM_ID_V = 0x220,
PPMU_V2_SM_ID_A = 0x224,
PPMU_V2_SM_OTHERS_V = 0x228,
PPMU_V2_SM_OTHERS_A = 0x22c,
PPMU_V2_INTERRUPT_RESET = 0x260,
};

/* PMNC register */
#define PPMU_V2_PMNC_START_MODE_SHIFT 20
#define PPMU_V2_PMNC_START_MODE_MASK (0x3 << PPMU_V2_PMNC_START_MODE_SHIFT)

#define PPMU_PMNC_CC_RESET_SHIFT 2
#define PPMU_PMNC_COUNTER_RESET_SHIFT 1
#define PPMU_PMNC_ENABLE_SHIFT 0
#define PPMU_PMNC_START_MODE_MASK BIT(16)
#define PPMU_PMNC_CC_DIVIDER_MASK BIT(3)
#define PPMU_PMNC_CC_RESET_MASK BIT(2)
#define PPMU_PMNC_COUNTER_RESET_MASK BIT(1)
#define PPMU_PMNC_ENABLE_MASK BIT(0)

#define PPMU_V2_PMNCT(x) (PPMU_V2_PMCNT0 + (0x4 * x))
#define PPMU_V2_CH_EVx_TYPE(x) (PPMU_V2_CH_EV0_TYPE + (0x4 * x))

#endif /* __EXYNOS_PPMU_H__ */

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