// SPDX-License-Identifier: GPL-2.0-only /* * exynos-nocp.c - Exynos NoC (Network On Chip) Probe support * * Copyright (c) 2016 Samsung Electronics Co., Ltd. * Author : Chanwoo Choi */ #include #include #include #include #include #include #include #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 */ }, }; MODULE_DEVICE_TABLE(of, exynos_nocp_id_match); 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 */ base = devm_platform_get_and_ioremap_resource(pdev, 0, &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); ret = clk_prepare_enable(nocp->clk); if (ret) { dev_err(&pdev->dev, "failed to prepare ppmu clock\n"); return ret; } pr_info("exynos-nocp: new NoC Probe device registered: %s\n", dev_name(dev)); return 0; } static void exynos_nocp_remove(struct platform_device *pdev) { struct exynos_nocp *nocp = platform_get_drvdata(pdev); clk_disable_unprepare(nocp->clk); } 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 "); MODULE_LICENSE("GPL");