1 // SPDX-License-Identifier: GPL-2.0
5  * Copyright (C) 2019 GRATE-DRIVER project
28 #define EMC_GATHER_CLEAR			(1 << 8)
41 	struct devfreq *devfreq = tegra->devfreq;  in tegra_devfreq_target()
53 	err = clk_set_min_rate(tegra->emc_clock, rate);  in tegra_devfreq_target()
57 	err = clk_set_rate(tegra->emc_clock, 0);  in tegra_devfreq_target()
64 	clk_set_min_rate(tegra->emc_clock, devfreq->previous_freq);  in tegra_devfreq_target()
76 	 * than the number of clocks. Conversion ratio of 1/8 results in a  in tegra_devfreq_get_dev_status()
84 	stat->busy_time = readl_relaxed(tegra->regs + MC_STAT_EMC_COUNT);  in tegra_devfreq_get_dev_status()
85 	stat->total_time = readl_relaxed(tegra->regs + MC_STAT_EMC_CLOCKS) / 8;  in tegra_devfreq_get_dev_status()
86 	stat->current_frequency = clk_get_rate(tegra->emc_clock);  in tegra_devfreq_get_dev_status()
88 	writel_relaxed(EMC_GATHER_CLEAR, tegra->regs + MC_STAT_CONTROL);  in tegra_devfreq_get_dev_status()
89 	writel_relaxed(EMC_GATHER_ENABLE, tegra->regs + MC_STAT_CONTROL);  in tegra_devfreq_get_dev_status()
106 	np = of_find_compatible_node(NULL, NULL, "nvidia,tegra20-mc-gart");  in tegra_get_memory_controller()
108 		return ERR_PTR(-ENOENT);  in tegra_get_memory_controller()
113 		return ERR_PTR(-ENODEV);  in tegra_get_memory_controller()
117 		return ERR_PTR(-EPROBE_DEFER);  in tegra_get_memory_controller()
133 		dev_err(&pdev->dev, "failed to get memory controller: %d\n",  in tegra_devfreq_probe()
138 	tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);  in tegra_devfreq_probe()
140 		return -ENOMEM;  in tegra_devfreq_probe()
142 	/* EMC is a system-critical clock that is always enabled */  in tegra_devfreq_probe()
143 	tegra->emc_clock = devm_clk_get(&pdev->dev, "emc");  in tegra_devfreq_probe()
144 	if (IS_ERR(tegra->emc_clock)) {  in tegra_devfreq_probe()
145 		err = PTR_ERR(tegra->emc_clock);  in tegra_devfreq_probe()
146 		dev_err(&pdev->dev, "failed to get emc clock: %d\n", err);  in tegra_devfreq_probe()
150 	tegra->regs = mc->regs;  in tegra_devfreq_probe()
152 	max_rate = clk_round_rate(tegra->emc_clock, ULONG_MAX);  in tegra_devfreq_probe()
155 		rate = clk_round_rate(tegra->emc_clock, rate);  in tegra_devfreq_probe()
157 		err = dev_pm_opp_add(&pdev->dev, rate, 0);  in tegra_devfreq_probe()
159 			dev_err(&pdev->dev, "failed to add opp: %d\n", err);  in tegra_devfreq_probe()
166 	 * statistics collection mode and set clocks counter saturation  in tegra_devfreq_probe()
169 	writel_relaxed(0x00000000, tegra->regs + MC_STAT_CONTROL);  in tegra_devfreq_probe()
170 	writel_relaxed(0x00000000, tegra->regs + MC_STAT_EMC_CONTROL);  in tegra_devfreq_probe()
171 	writel_relaxed(0xffffffff, tegra->regs + MC_STAT_EMC_CLOCK_LIMIT);  in tegra_devfreq_probe()
175 	tegra->devfreq = devfreq_add_device(&pdev->dev, &tegra_devfreq_profile,  in tegra_devfreq_probe()
177 	if (IS_ERR(tegra->devfreq)) {  in tegra_devfreq_probe()
178 		err = PTR_ERR(tegra->devfreq);  in tegra_devfreq_probe()
185 	dev_pm_opp_remove_all_dynamic(&pdev->dev);  in tegra_devfreq_probe()
194 	devfreq_remove_device(tegra->devfreq);  in tegra_devfreq_remove()
195 	dev_pm_opp_remove_all_dynamic(&pdev->dev);  in tegra_devfreq_remove()
204 		.name	= "tegra20-devfreq",
209 MODULE_ALIAS("platform:tegra20-devfreq");