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300 lines
7.3 KiB
300 lines
7.3 KiB
// 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 <[email protected]> |
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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 <[email protected]>"); |
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MODULE_LICENSE("GPL");
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