diff options
author | Chanwoo Choi <cw00.choi@samsung.com> | 2014-03-21 18:31:43 +0100 |
---|---|---|
committer | MyungJoo Ham <myungjoo.ham@samsung.com> | 2014-05-24 17:56:39 +0900 |
commit | ba778b374d55945a190f01f7a741c9657ae5f519 (patch) | |
tree | 85a7bfbd4428aee6b5dfc850c23dc60f4583c030 | |
parent | ae29fa1d50bead8f1971f30aa9a73bfbff984824 (diff) | |
download | linux-ba778b374d55945a190f01f7a741c9657ae5f519.tar.bz2 |
PM / devfreq: exynos4: use common PPMU code
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@samsung.com>
[bzolnier: splitted out changes from the bigger patch]
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
-rw-r--r-- | drivers/devfreq/exynos/Makefile | 2 | ||||
-rw-r--r-- | 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 bfaaf5b0d61d..49bc9175f923 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 5a48d162b228..228c658c0e8c 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) { |