diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/devfreq/event/exynos-nocp.c | 300 |
1 files changed, 300 insertions, 0 deletions
diff --git a/drivers/devfreq/event/exynos-nocp.c b/drivers/devfreq/event/exynos-nocp.c new file mode 100644 index 000000000..ccc531ee6 --- /dev/null +++ b/drivers/devfreq/event/exynos-nocp.c @@ -0,0 +1,300 @@ +// 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 <cw00.choi@samsung.com> + */ + +#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 */ }, +}; +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 */ + 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); + + 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 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"); |