1 // SPDX-License-Identifier: GPL-2.0-only
3  * exynos-nocp.c - Exynos NoC (Network On Chip) Probe support
11 #include <linux/devfreq-event.h>
17 #include "exynos-nocp.h"
30  * The devfreq-event ops structure for nocp probe.
37 	/* Disable NoC probe */  in exynos_nocp_set_event()
38 	ret = regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL,  in exynos_nocp_set_event()
41 		dev_err(nocp->dev, "failed to disable the NoC probe device\n");  in exynos_nocp_set_event()
46 	ret = regmap_write(nocp->regmap, NOCP_STAT_PERIOD, 0x0);  in exynos_nocp_set_event()
51 	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_0_SRC,  in exynos_nocp_set_event()
57 	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_1_SRC,  in exynos_nocp_set_event()
63 	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_2_SRC,  in exynos_nocp_set_event()
69 	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_3_SRC,  in exynos_nocp_set_event()
77 	ret = regmap_write(nocp->regmap, NOCP_STAT_ALARM_MIN, 0x0);  in exynos_nocp_set_event()
81 	ret = regmap_write(nocp->regmap, NOCP_STAT_ALARM_MAX, 0x0);  in exynos_nocp_set_event()
86 	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_0_ALARM_MODE,  in exynos_nocp_set_event()
92 	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_1_ALARM_MODE,  in exynos_nocp_set_event()
98 	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_2_ALARM_MODE,  in exynos_nocp_set_event()
104 	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_3_ALARM_MODE,  in exynos_nocp_set_event()
111 	ret = regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL,  in exynos_nocp_set_event()
118 	ret = regmap_update_bits(nocp->regmap, NOCP_CFG_CTL,  in exynos_nocp_set_event()
124 	/* Enable NoC probe */  in exynos_nocp_set_event()
125 	ret = regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL,  in exynos_nocp_set_event()
134 	/* Reset NoC probe */  in exynos_nocp_set_event()
135 	if (regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL,  in exynos_nocp_set_event()
137 		dev_err(nocp->dev, "Failed to reset NoC probe device\n");  in exynos_nocp_set_event()
151 	ret = regmap_read(nocp->regmap, NOCP_COUNTERS_0_VAL, &counter[0]);  in exynos_nocp_get_event()
155 	ret = regmap_read(nocp->regmap, NOCP_COUNTERS_1_VAL, &counter[1]);  in exynos_nocp_get_event()
159 	ret = regmap_read(nocp->regmap, NOCP_COUNTERS_2_VAL, &counter[2]);  in exynos_nocp_get_event()
163 	ret = regmap_read(nocp->regmap, NOCP_COUNTERS_3_VAL, &counter[3]);  in exynos_nocp_get_event()
167 	edata->load_count = ((counter[1] << 16) | counter[0]);  in exynos_nocp_get_event()
168 	edata->total_count = ((counter[3] << 16) | counter[2]);  in exynos_nocp_get_event()
170 	dev_dbg(&edev->dev, "%s (event: %ld/%ld)\n", edev->desc->name,  in exynos_nocp_get_event()
171 					edata->load_count, edata->total_count);  in exynos_nocp_get_event()
176 	dev_err(nocp->dev, "Failed to read the counter of NoC probe device\n");  in exynos_nocp_get_event()
187 	{ .compatible = "samsung,exynos5420-nocp", },
202 	struct device *dev = nocp->dev;  in exynos_nocp_parse_dt()
203 	struct device_node *np = dev->of_node;  in exynos_nocp_parse_dt()
209 		return -EINVAL;  in exynos_nocp_parse_dt()
212 	nocp->clk = devm_clk_get(dev, "nocp");  in exynos_nocp_parse_dt()
213 	if (IS_ERR(nocp->clk))  in exynos_nocp_parse_dt()
214 		nocp->clk = NULL;  in exynos_nocp_parse_dt()
221 	exynos_nocp_regmap_config.max_register = resource_size(res) - 4;  in exynos_nocp_parse_dt()
223 	nocp->regmap = devm_regmap_init_mmio(dev, base,  in exynos_nocp_parse_dt()
225 	if (IS_ERR(nocp->regmap)) {  in exynos_nocp_parse_dt()
227 		return PTR_ERR(nocp->regmap);  in exynos_nocp_parse_dt()
235 	struct device *dev = &pdev->dev;  in exynos_nocp_probe()
236 	struct device_node *np = dev->of_node;  in exynos_nocp_probe()
240 	nocp = devm_kzalloc(&pdev->dev, sizeof(*nocp), GFP_KERNEL);  in exynos_nocp_probe()
242 		return -ENOMEM;  in exynos_nocp_probe()
244 	nocp->dev = &pdev->dev;  in exynos_nocp_probe()
249 		dev_err(&pdev->dev,  in exynos_nocp_probe()
254 	/* Add devfreq-event device to measure the bandwidth of NoC */  in exynos_nocp_probe()
255 	nocp->desc.ops = &exynos_nocp_ops;  in exynos_nocp_probe()
256 	nocp->desc.driver_data = nocp;  in exynos_nocp_probe()
257 	nocp->desc.name = np->full_name;  in exynos_nocp_probe()
258 	nocp->edev = devm_devfreq_event_add_edev(&pdev->dev, &nocp->desc);  in exynos_nocp_probe()
259 	if (IS_ERR(nocp->edev)) {  in exynos_nocp_probe()
260 		dev_err(&pdev->dev,  in exynos_nocp_probe()
261 			"failed to add devfreq-event device\n");  in exynos_nocp_probe()
262 		return PTR_ERR(nocp->edev);  in exynos_nocp_probe()
266 	ret = clk_prepare_enable(nocp->clk);  in exynos_nocp_probe()
268 		dev_err(&pdev->dev, "failed to prepare ppmu clock\n");  in exynos_nocp_probe()
272 	pr_info("exynos-nocp: new NoC Probe device registered: %s\n",  in exynos_nocp_probe()
282 	clk_disable_unprepare(nocp->clk);  in exynos_nocp_remove()
286 	.probe	= exynos_nocp_probe,
289 		.name	= "exynos-nocp",
295 MODULE_DESCRIPTION("Exynos NoC (Network on Chip) Probe driver");