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Date: Fri, 21 Mar 2014 18:31:43 +0100
From: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To: cw00.choi@...sung.com, myungjoo.ham@...sung.com
Cc: kyungmin.park@...sung.com, rafael.j.wysocki@...el.com,
t.figa@...sung.com, linux-samsung-soc@...r.kernel.org,
linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
b.zolnierkie@...sung.com
Subject: [PATCH 1/4] devfreq: exynos4: use common PPMU code
From: Chanwoo Choi <cw00.choi@...sung.com>
This patch converts exynos4_bus driver to use common PPMU code
(exynos_ppmu.c) instead of individual functions related to PPC
because PPMU is integrated module with both PPC and Bus event
generator. When using PPMU to get bus performance read/write
event exynos4_bus driver deson't need to consider memory type.
Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
[bzolnier: splitted out changes from the bigger patch]
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
---
drivers/devfreq/exynos/Makefile | 2 +-
drivers/devfreq/exynos/exynos4_bus.c | 164 +++++++++++++----------------------
2 files changed, 62 insertions(+), 104 deletions(-)
diff --git a/drivers/devfreq/exynos/Makefile b/drivers/devfreq/exynos/Makefile
index bfaaf5b..49bc917 100644
--- a/drivers/devfreq/exynos/Makefile
+++ b/drivers/devfreq/exynos/Makefile
@@ -1,3 +1,3 @@
# Exynos DEVFREQ Drivers
-obj-$(CONFIG_ARM_EXYNOS4_BUS_DEVFREQ) += exynos4_bus.o
+obj-$(CONFIG_ARM_EXYNOS4_BUS_DEVFREQ) += exynos_ppmu.o exynos4_bus.o
obj-$(CONFIG_ARM_EXYNOS5_BUS_DEVFREQ) += exynos_ppmu.o exynos5_bus.o
diff --git a/drivers/devfreq/exynos/exynos4_bus.c b/drivers/devfreq/exynos/exynos4_bus.c
index 5a48d16..228c658 100644
--- a/drivers/devfreq/exynos/exynos4_bus.c
+++ b/drivers/devfreq/exynos/exynos4_bus.c
@@ -25,15 +25,16 @@
#include <linux/regulator/consumer.h>
#include <linux/module.h>
+#include <mach/map.h>
+
+#include "exynos_ppmu.h"
+#include "exynos4_bus.h"
+
/* Exynos4 ASV has been in the mailing list, but not upstreamed, yet. */
#ifdef CONFIG_EXYNOS_ASV
extern unsigned int exynos_result_of_asv;
#endif
-#include <mach/map.h>
-
-#include "exynos4_bus.h"
-
#define MAX_SAFEVOLT 1200000 /* 1.2V */
enum exynos4_busf_type {
@@ -44,22 +45,6 @@ enum exynos4_busf_type {
/* Assume that the bus is saturated if the utilization is 40% */
#define BUS_SATURATION_RATIO 40
-enum ppmu_counter {
- PPMU_PMNCNT0 = 0,
- PPMU_PMCCNT1,
- PPMU_PMNCNT2,
- PPMU_PMNCNT3,
- PPMU_PMNCNT_MAX,
-};
-struct exynos4_ppmu {
- void __iomem *hw_base;
- unsigned int ccnt;
- unsigned int event;
- unsigned int count[PPMU_PMNCNT_MAX];
- bool ccnt_overflow;
- bool count_overflow[PPMU_PMNCNT_MAX];
-};
-
enum busclk_level_idx {
LV_0 = 0,
LV_1,
@@ -68,6 +53,13 @@ enum busclk_level_idx {
LV_4,
_LV_END
};
+
+enum exynos_ppmu_idx {
+ PPMU_DMC0,
+ PPMU_DMC1,
+ PPMU_END,
+};
+
#define EX4210_LV_MAX LV_2
#define EX4x12_LV_MAX LV_4
#define EX4210_LV_NUM (LV_2 + 1)
@@ -91,7 +83,7 @@ struct busfreq_data {
struct regulator *vdd_int;
struct regulator *vdd_mif; /* Exynos4412/4212 only */
struct busfreq_opp_info curr_oppinfo;
- struct exynos4_ppmu dmc[2];
+ struct exynos_ppmu ppmu[PPMU_END];
struct notifier_block pm_notifier;
struct mutex lock;
@@ -101,12 +93,6 @@ struct busfreq_data {
unsigned int top_divtable[_LV_END];
};
-struct bus_opp_table {
- unsigned int idx;
- unsigned long clk;
- unsigned long volt;
-};
-
/* 4210 controls clock of mif and voltage of int */
static struct bus_opp_table exynos4210_busclk_table[] = {
{LV_0, 400000, 1150000},
@@ -524,27 +510,22 @@ static int exynos4x12_set_busclk(struct busfreq_data *data,
return 0;
}
-
static void busfreq_mon_reset(struct busfreq_data *data)
{
unsigned int i;
- for (i = 0; i < 2; i++) {
- void __iomem *ppmu_base = data->dmc[i].hw_base;
+ for (i = 0; i < PPMU_END; i++) {
+ void __iomem *ppmu_base = data->ppmu[i].hw_base;
- /* Reset PPMU */
- __raw_writel(0x8000000f, ppmu_base + 0xf010);
- __raw_writel(0x8000000f, ppmu_base + 0xf050);
- __raw_writel(0x6, ppmu_base + 0xf000);
- __raw_writel(0x0, ppmu_base + 0xf100);
+ /* Reset the performance and cycle counters */
+ exynos_ppmu_reset(ppmu_base);
- /* Set PPMU Event */
- data->dmc[i].event = 0x6;
- __raw_writel(((data->dmc[i].event << 12) | 0x1),
- ppmu_base + 0xfc);
+ /* Setup count registers to monitor read/write transactions */
+ data->ppmu[i].event[PPMU_PMNCNT3] = RDWR_DATA_COUNT;
+ exynos_ppmu_setevent(ppmu_base, PPMU_PMNCNT3,
+ data->ppmu[i].event[PPMU_PMNCNT3]);
- /* Start PPMU */
- __raw_writel(0x1, ppmu_base + 0xf000);
+ exynos_ppmu_start(ppmu_base);
}
}
@@ -552,23 +533,20 @@ static void exynos4_read_ppmu(struct busfreq_data *data)
{
int i, j;
- for (i = 0; i < 2; i++) {
- void __iomem *ppmu_base = data->dmc[i].hw_base;
- u32 overflow;
+ for (i = 0; i < PPMU_END; i++) {
+ void __iomem *ppmu_base = data->ppmu[i].hw_base;
- /* Stop PPMU */
- __raw_writel(0x0, ppmu_base + 0xf000);
+ exynos_ppmu_stop(ppmu_base);
/* Update local data from PPMU */
- overflow = __raw_readl(ppmu_base + 0xf050);
-
- data->dmc[i].ccnt = __raw_readl(ppmu_base + 0xf100);
- data->dmc[i].ccnt_overflow = overflow & (1 << 31);
-
- for (j = 0; j < PPMU_PMNCNT_MAX; j++) {
- data->dmc[i].count[j] = __raw_readl(
- ppmu_base + (0xf110 + (0x10 * j)));
- data->dmc[i].count_overflow[j] = overflow & (1 << j);
+ data->ppmu[i].ccnt = __raw_readl(ppmu_base + PPMU_CCNT);
+
+ for (j = PPMU_PMNCNT0; j < PPMU_PMNCNT_MAX; j++) {
+ if (data->ppmu[i].event[j] == 0)
+ data->ppmu[i].count[j] = 0;
+ else
+ data->ppmu[i].count[j] =
+ exynos_ppmu_read(ppmu_base, j);
}
}
@@ -698,66 +676,42 @@ out:
return err;
}
-static int exynos4_get_busier_dmc(struct busfreq_data *data)
+static int exynos4_get_busier_ppmu(struct busfreq_data *data)
{
- u64 p0 = data->dmc[0].count[0];
- u64 p1 = data->dmc[1].count[0];
-
- p0 *= data->dmc[1].ccnt;
- p1 *= data->dmc[0].ccnt;
-
- if (data->dmc[1].ccnt == 0)
- return 0;
+ int i, j;
+ int busy = 0;
+ unsigned int temp = 0;
+
+ for (i = 0; i < PPMU_END; i++) {
+ for (j = PPMU_PMNCNT0; j < PPMU_PMNCNT_MAX; j++) {
+ if (data->ppmu[i].count[j] > temp) {
+ temp = data->ppmu[i].count[j];
+ busy = i;
+ }
+ }
+ }
- if (p0 > p1)
- return 0;
- return 1;
+ return busy;
}
static int exynos4_bus_get_dev_status(struct device *dev,
struct devfreq_dev_status *stat)
{
struct busfreq_data *data = dev_get_drvdata(dev);
- int busier_dmc;
- int cycles_x2 = 2; /* 2 x cycles */
- void __iomem *addr;
- u32 timing;
- u32 memctrl;
+ int busier;
exynos4_read_ppmu(data);
- busier_dmc = exynos4_get_busier_dmc(data);
+ busier = exynos4_get_busier_ppmu(data);
stat->current_frequency = data->curr_oppinfo.rate;
- if (busier_dmc)
- addr = S5P_VA_DMC1;
- else
- addr = S5P_VA_DMC0;
-
- memctrl = __raw_readl(addr + 0x04); /* one of DDR2/3/LPDDR2 */
- timing = __raw_readl(addr + 0x38); /* CL or WL/RL values */
-
- switch ((memctrl >> 8) & 0xf) {
- case 0x4: /* DDR2 */
- cycles_x2 = ((timing >> 16) & 0xf) * 2;
- break;
- case 0x5: /* LPDDR2 */
- case 0x6: /* DDR3 */
- cycles_x2 = ((timing >> 8) & 0xf) + ((timing >> 0) & 0xf);
- break;
- default:
- pr_err("%s: Unknown Memory Type(%d).\n", __func__,
- (memctrl >> 8) & 0xf);
- return -EINVAL;
- }
-
/* Number of cycles spent on memory access */
- stat->busy_time = data->dmc[busier_dmc].count[0] / 2 * (cycles_x2 + 2);
+ stat->busy_time = data->ppmu[busier].count[PPMU_PMNCNT3];
stat->busy_time *= 100 / BUS_SATURATION_RATIO;
- stat->total_time = data->dmc[busier_dmc].ccnt;
+ stat->total_time = data->ppmu[busier].ccnt;
/* If the counters have overflown, retry */
- if (data->dmc[busier_dmc].ccnt_overflow ||
- data->dmc[busier_dmc].count_overflow[0])
+ if (data->ppmu[busier].ccnt_overflow ||
+ data->ppmu[busier].count_overflow[0])
return -EAGAIN;
return 0;
@@ -1023,8 +977,8 @@ static int exynos4_busfreq_probe(struct platform_device *pdev)
}
data->type = pdev->id_entry->driver_data;
- data->dmc[0].hw_base = S5P_VA_DMC0;
- data->dmc[1].hw_base = S5P_VA_DMC1;
+ data->ppmu[PPMU_DMC0].hw_base = S5P_VA_DMC0;
+ data->ppmu[PPMU_DMC1].hw_base = S5P_VA_DMC1;
data->pm_notifier.notifier_call = exynos4_busfreq_pm_notifier_event;
data->dev = dev;
mutex_init(&data->lock);
@@ -1074,13 +1028,17 @@ static int exynos4_busfreq_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, data);
- busfreq_mon_reset(data);
-
data->devfreq = devfreq_add_device(dev, &exynos4_devfreq_profile,
"simple_ondemand", NULL);
if (IS_ERR(data->devfreq))
return PTR_ERR(data->devfreq);
+ /*
+ * Start PPMU (Performance Profiling Monitoring Unit) to check
+ * utilization of each IP in the Exynos4 SoC.
+ */
+ busfreq_mon_reset(data);
+
/* Register opp_notifier for Exynos4 busfreq */
err = devfreq_register_opp_notifier(dev, data->devfreq);
if (err < 0) {
--
1.8.2.3
--
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