![Axel Lin](/assets/img/avatar_default.png)
load_count/total_count are reset by devfreq_event_get_event(), so remove the redundant code in exynos_nocp_get_event(). Signed-off-by: Axel Lin <axel.lin@ingics.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> [ rjw: Subject/changelog ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
299 lines
7.3 KiB
C
299 lines
7.3 KiB
C
/*
|
|
* 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:
|
|
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);
|
|
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");
|