301 строка
7.3 KiB
C
301 строка
7.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* exynos-nocp.c - Exynos NoC (Network On Chip) Probe support
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*
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* Copyright (c) 2016 Samsung Electronics Co., Ltd.
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* Author : Chanwoo Choi <cw00.choi@samsung.com>
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*/
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#include <linux/clk.h>
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#include <linux/module.h>
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#include <linux/devfreq-event.h>
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#include <linux/kernel.h>
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include "exynos-nocp.h"
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struct exynos_nocp {
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struct devfreq_event_dev *edev;
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struct devfreq_event_desc desc;
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struct device *dev;
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struct regmap *regmap;
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struct clk *clk;
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};
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/*
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* The devfreq-event ops structure for nocp probe.
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*/
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static int exynos_nocp_set_event(struct devfreq_event_dev *edev)
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{
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struct exynos_nocp *nocp = devfreq_event_get_drvdata(edev);
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int ret;
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/* Disable NoC probe */
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ret = regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL,
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NOCP_MAIN_CTL_STATEN_MASK, 0);
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if (ret < 0) {
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dev_err(nocp->dev, "failed to disable the NoC probe device\n");
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return ret;
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}
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/* Set a statistics dump period to 0 */
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ret = regmap_write(nocp->regmap, NOCP_STAT_PERIOD, 0x0);
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if (ret < 0)
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goto out;
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/* Set the IntEvent fields of *_SRC */
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ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_0_SRC,
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NOCP_CNT_SRC_INTEVENT_MASK,
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NOCP_CNT_SRC_INTEVENT_BYTE_MASK);
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if (ret < 0)
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goto out;
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ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_1_SRC,
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NOCP_CNT_SRC_INTEVENT_MASK,
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NOCP_CNT_SRC_INTEVENT_CHAIN_MASK);
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if (ret < 0)
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goto out;
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ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_2_SRC,
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NOCP_CNT_SRC_INTEVENT_MASK,
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NOCP_CNT_SRC_INTEVENT_CYCLE_MASK);
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if (ret < 0)
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goto out;
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ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_3_SRC,
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NOCP_CNT_SRC_INTEVENT_MASK,
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NOCP_CNT_SRC_INTEVENT_CHAIN_MASK);
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if (ret < 0)
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goto out;
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/* Set an alarm with a max/min value of 0 to generate StatALARM */
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ret = regmap_write(nocp->regmap, NOCP_STAT_ALARM_MIN, 0x0);
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if (ret < 0)
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goto out;
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ret = regmap_write(nocp->regmap, NOCP_STAT_ALARM_MAX, 0x0);
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if (ret < 0)
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goto out;
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/* Set AlarmMode */
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ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_0_ALARM_MODE,
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NOCP_CNT_ALARM_MODE_MASK,
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NOCP_CNT_ALARM_MODE_MIN_MAX_MASK);
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if (ret < 0)
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goto out;
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ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_1_ALARM_MODE,
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NOCP_CNT_ALARM_MODE_MASK,
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NOCP_CNT_ALARM_MODE_MIN_MAX_MASK);
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if (ret < 0)
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goto out;
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ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_2_ALARM_MODE,
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NOCP_CNT_ALARM_MODE_MASK,
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NOCP_CNT_ALARM_MODE_MIN_MAX_MASK);
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if (ret < 0)
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goto out;
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ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_3_ALARM_MODE,
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NOCP_CNT_ALARM_MODE_MASK,
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NOCP_CNT_ALARM_MODE_MIN_MAX_MASK);
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if (ret < 0)
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goto out;
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/* Enable the measurements by setting AlarmEn and StatEn */
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ret = regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL,
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NOCP_MAIN_CTL_STATEN_MASK | NOCP_MAIN_CTL_ALARMEN_MASK,
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NOCP_MAIN_CTL_STATEN_MASK | NOCP_MAIN_CTL_ALARMEN_MASK);
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if (ret < 0)
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goto out;
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/* Set GlobalEN */
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ret = regmap_update_bits(nocp->regmap, NOCP_CFG_CTL,
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NOCP_CFG_CTL_GLOBALEN_MASK,
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NOCP_CFG_CTL_GLOBALEN_MASK);
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if (ret < 0)
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goto out;
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/* Enable NoC probe */
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ret = regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL,
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NOCP_MAIN_CTL_STATEN_MASK,
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NOCP_MAIN_CTL_STATEN_MASK);
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if (ret < 0)
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goto out;
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return 0;
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out:
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/* Reset NoC probe */
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if (regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL,
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NOCP_MAIN_CTL_STATEN_MASK, 0)) {
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dev_err(nocp->dev, "Failed to reset NoC probe device\n");
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}
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return ret;
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}
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static int exynos_nocp_get_event(struct devfreq_event_dev *edev,
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struct devfreq_event_data *edata)
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{
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struct exynos_nocp *nocp = devfreq_event_get_drvdata(edev);
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unsigned int counter[4];
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int ret;
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/* Read cycle count */
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ret = regmap_read(nocp->regmap, NOCP_COUNTERS_0_VAL, &counter[0]);
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if (ret < 0)
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goto out;
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ret = regmap_read(nocp->regmap, NOCP_COUNTERS_1_VAL, &counter[1]);
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if (ret < 0)
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goto out;
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ret = regmap_read(nocp->regmap, NOCP_COUNTERS_2_VAL, &counter[2]);
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if (ret < 0)
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goto out;
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ret = regmap_read(nocp->regmap, NOCP_COUNTERS_3_VAL, &counter[3]);
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if (ret < 0)
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goto out;
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edata->load_count = ((counter[1] << 16) | counter[0]);
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edata->total_count = ((counter[3] << 16) | counter[2]);
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dev_dbg(&edev->dev, "%s (event: %ld/%ld)\n", edev->desc->name,
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edata->load_count, edata->total_count);
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return 0;
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out:
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dev_err(nocp->dev, "Failed to read the counter of NoC probe device\n");
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return ret;
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}
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static const struct devfreq_event_ops exynos_nocp_ops = {
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.set_event = exynos_nocp_set_event,
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.get_event = exynos_nocp_get_event,
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};
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static const struct of_device_id exynos_nocp_id_match[] = {
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{ .compatible = "samsung,exynos5420-nocp", },
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, exynos_nocp_id_match);
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static struct regmap_config exynos_nocp_regmap_config = {
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.reg_bits = 32,
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.val_bits = 32,
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.reg_stride = 4,
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.max_register = NOCP_COUNTERS_3_VAL,
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};
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static int exynos_nocp_parse_dt(struct platform_device *pdev,
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struct exynos_nocp *nocp)
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{
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struct device *dev = nocp->dev;
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struct device_node *np = dev->of_node;
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struct resource *res;
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void __iomem *base;
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if (!np) {
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dev_err(dev, "failed to find devicetree node\n");
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return -EINVAL;
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}
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nocp->clk = devm_clk_get(dev, "nocp");
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if (IS_ERR(nocp->clk))
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nocp->clk = NULL;
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/* Maps the memory mapped IO to control nocp register */
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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base = devm_ioremap_resource(dev, res);
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if (IS_ERR(base))
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return PTR_ERR(base);
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exynos_nocp_regmap_config.max_register = resource_size(res) - 4;
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nocp->regmap = devm_regmap_init_mmio(dev, base,
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&exynos_nocp_regmap_config);
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if (IS_ERR(nocp->regmap)) {
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dev_err(dev, "failed to initialize regmap\n");
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return PTR_ERR(nocp->regmap);
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}
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return 0;
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}
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static int exynos_nocp_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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struct exynos_nocp *nocp;
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int ret;
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nocp = devm_kzalloc(&pdev->dev, sizeof(*nocp), GFP_KERNEL);
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if (!nocp)
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return -ENOMEM;
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nocp->dev = &pdev->dev;
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/* Parse dt data to get resource */
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ret = exynos_nocp_parse_dt(pdev, nocp);
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if (ret < 0) {
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dev_err(&pdev->dev,
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"failed to parse devicetree for resource\n");
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return ret;
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}
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/* Add devfreq-event device to measure the bandwidth of NoC */
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nocp->desc.ops = &exynos_nocp_ops;
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nocp->desc.driver_data = nocp;
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nocp->desc.name = np->full_name;
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nocp->edev = devm_devfreq_event_add_edev(&pdev->dev, &nocp->desc);
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if (IS_ERR(nocp->edev)) {
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dev_err(&pdev->dev,
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"failed to add devfreq-event device\n");
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return PTR_ERR(nocp->edev);
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}
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platform_set_drvdata(pdev, nocp);
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ret = clk_prepare_enable(nocp->clk);
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if (ret) {
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dev_err(&pdev->dev, "failed to prepare ppmu clock\n");
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return ret;
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}
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pr_info("exynos-nocp: new NoC Probe device registered: %s\n",
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dev_name(dev));
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return 0;
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}
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static int exynos_nocp_remove(struct platform_device *pdev)
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{
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struct exynos_nocp *nocp = platform_get_drvdata(pdev);
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clk_disable_unprepare(nocp->clk);
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return 0;
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}
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static struct platform_driver exynos_nocp_driver = {
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.probe = exynos_nocp_probe,
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.remove = exynos_nocp_remove,
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.driver = {
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.name = "exynos-nocp",
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.of_match_table = exynos_nocp_id_match,
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},
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};
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module_platform_driver(exynos_nocp_driver);
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MODULE_DESCRIPTION("Exynos NoC (Network on Chip) Probe driver");
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MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
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MODULE_LICENSE("GPL");
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