3  * Author: Lin Huang <hl@rock-chips.com>
16 #include <linux/devfreq-event.h>
46 /* pmu grf */
64  * The dfi controller can monitor DDR load. It has an upper and lower threshold
66  * generated to indicate the DDR frequency should be changed.
81 	void __iomem *dfi_regs = info->regs;  in rockchip_dfi_start_hardware_counter()
85 	/* get ddr type */  in rockchip_dfi_start_hardware_counter()
86 	regmap_read(info->regmap_pmu, PMUGRF_OS_REG2, &val);  in rockchip_dfi_start_hardware_counter()
92 	/* set ddr type to dfi */  in rockchip_dfi_start_hardware_counter()
105 	void __iomem *dfi_regs = info->regs;  in rockchip_dfi_stop_hardware_counter()
115 	void __iomem *dfi_regs = info->regs;  in rockchip_dfi_get_busier_ch()
121 		info->ch_usage[i].access = readl_relaxed(dfi_regs +  in rockchip_dfi_get_busier_ch()
123 		info->ch_usage[i].total = readl_relaxed(dfi_regs +  in rockchip_dfi_get_busier_ch()
125 		tmp = info->ch_usage[i].access;  in rockchip_dfi_get_busier_ch()
141 	clk_disable_unprepare(info->clk);  in rockchip_dfi_disable()
151 	ret = clk_prepare_enable(info->clk);  in rockchip_dfi_enable()
153 		dev_err(&edev->dev, "failed to enable dfi clk: %d\n", ret);  in rockchip_dfi_enable()
174 	edata->load_count = info->ch_usage[busier_ch].access;  in rockchip_dfi_get_event()
175 	edata->total_count = info->ch_usage[busier_ch].total;  in rockchip_dfi_get_event()
188 	{ .compatible = "rockchip,rk3399-dfi" },
195 	struct device *dev = &pdev->dev;  in rockchip_dfi_probe()
199 	struct device_node *np = pdev->dev.of_node, *node;  in rockchip_dfi_probe()
203 		return -ENOMEM;  in rockchip_dfi_probe()
206 	data->regs = devm_ioremap_resource(&pdev->dev, res);  in rockchip_dfi_probe()
207 	if (IS_ERR(data->regs))  in rockchip_dfi_probe()
208 		return PTR_ERR(data->regs);  in rockchip_dfi_probe()
210 	data->clk = devm_clk_get(dev, "pclk_ddr_mon");  in rockchip_dfi_probe()
211 	if (IS_ERR(data->clk)) {  in rockchip_dfi_probe()
213 		return PTR_ERR(data->clk);  in rockchip_dfi_probe()
216 	/* try to find the optional reference to the pmu syscon */  in rockchip_dfi_probe()
217 	node = of_parse_phandle(np, "rockchip,pmu", 0);  in rockchip_dfi_probe()
219 		data->regmap_pmu = syscon_node_to_regmap(node);  in rockchip_dfi_probe()
220 		if (IS_ERR(data->regmap_pmu))  in rockchip_dfi_probe()
221 			return PTR_ERR(data->regmap_pmu);  in rockchip_dfi_probe()
223 	data->dev = dev;  in rockchip_dfi_probe()
227 		return -ENOMEM;  in rockchip_dfi_probe()
229 	desc->ops = &rockchip_dfi_ops;  in rockchip_dfi_probe()
230 	desc->driver_data = data;  in rockchip_dfi_probe()
231 	desc->name = np->name;  in rockchip_dfi_probe()
232 	data->desc = desc;  in rockchip_dfi_probe()
234 	data->edev = devm_devfreq_event_add_edev(&pdev->dev, desc);  in rockchip_dfi_probe()
235 	if (IS_ERR(data->edev)) {  in rockchip_dfi_probe()
236 		dev_err(&pdev->dev,  in rockchip_dfi_probe()
237 			"failed to add devfreq-event device\n");  in rockchip_dfi_probe()
238 		return PTR_ERR(data->edev);  in rockchip_dfi_probe()
249 		.name	= "rockchip-dfi",
256 MODULE_AUTHOR("Lin Huang <hl@rock-chips.com>");