1 // SPDX-License-Identifier: GPL-2.0-only
4  * Author: Lin Huang <hl@rock-chips.com>
8 #include <linux/devfreq-event.h>
46  * The dfi controller can monitor DDR load. It has an upper and lower threshold
48  * generated to indicate the DDR frequency should be changed.
63 	void __iomem *dfi_regs = info->regs;  in rockchip_dfi_start_hardware_counter()
67 	/* get ddr type */  in rockchip_dfi_start_hardware_counter()
68 	regmap_read(info->regmap_pmu, RK3399_PMUGRF_OS_REG2, &val);  in rockchip_dfi_start_hardware_counter()
75 	/* set ddr type to dfi */  in rockchip_dfi_start_hardware_counter()
88 	void __iomem *dfi_regs = info->regs;  in rockchip_dfi_stop_hardware_counter()
98 	void __iomem *dfi_regs = info->regs;  in rockchip_dfi_get_busier_ch()
104 		info->ch_usage[i].access = readl_relaxed(dfi_regs +  in rockchip_dfi_get_busier_ch()
106 		info->ch_usage[i].total = readl_relaxed(dfi_regs +  in rockchip_dfi_get_busier_ch()
108 		tmp = info->ch_usage[i].access;  in rockchip_dfi_get_busier_ch()
124 	clk_disable_unprepare(info->clk);  in rockchip_dfi_disable()
134 	ret = clk_prepare_enable(info->clk);  in rockchip_dfi_enable()
136 		dev_err(&edev->dev, "failed to enable dfi clk: %d\n", ret);  in rockchip_dfi_enable()
157 	edata->load_count = info->ch_usage[busier_ch].access;  in rockchip_dfi_get_event()
158 	edata->total_count = info->ch_usage[busier_ch].total;  in rockchip_dfi_get_event()
171 	{ .compatible = "rockchip,rk3399-dfi" },
178 	struct device *dev = &pdev->dev;  in rockchip_dfi_probe()
181 	struct device_node *np = pdev->dev.of_node, *node;  in rockchip_dfi_probe()
185 		return -ENOMEM;  in rockchip_dfi_probe()
187 	data->regs = devm_platform_ioremap_resource(pdev, 0);  in rockchip_dfi_probe()
188 	if (IS_ERR(data->regs))  in rockchip_dfi_probe()
189 		return PTR_ERR(data->regs);  in rockchip_dfi_probe()
191 	data->clk = devm_clk_get(dev, "pclk_ddr_mon");  in rockchip_dfi_probe()
192 	if (IS_ERR(data->clk))  in rockchip_dfi_probe()
193 		return dev_err_probe(dev, PTR_ERR(data->clk),  in rockchip_dfi_probe()
196 	/* try to find the optional reference to the pmu syscon */  in rockchip_dfi_probe()
197 	node = of_parse_phandle(np, "rockchip,pmu", 0);  in rockchip_dfi_probe()
199 		data->regmap_pmu = syscon_node_to_regmap(node);  in rockchip_dfi_probe()
201 		if (IS_ERR(data->regmap_pmu))  in rockchip_dfi_probe()
202 			return PTR_ERR(data->regmap_pmu);  in rockchip_dfi_probe()
204 	data->dev = dev;  in rockchip_dfi_probe()
208 		return -ENOMEM;  in rockchip_dfi_probe()
210 	desc->ops = &rockchip_dfi_ops;  in rockchip_dfi_probe()
211 	desc->driver_data = data;  in rockchip_dfi_probe()
212 	desc->name = np->name;  in rockchip_dfi_probe()
213 	data->desc = desc;  in rockchip_dfi_probe()
215 	data->edev = devm_devfreq_event_add_edev(&pdev->dev, desc);  in rockchip_dfi_probe()
216 	if (IS_ERR(data->edev)) {  in rockchip_dfi_probe()
217 		dev_err(&pdev->dev,  in rockchip_dfi_probe()
218 			"failed to add devfreq-event device\n");  in rockchip_dfi_probe()
219 		return PTR_ERR(data->edev);  in rockchip_dfi_probe()
230 		.name	= "rockchip-dfi",
237 MODULE_AUTHOR("Lin Huang <hl@rock-chips.com>");