1 // SPDX-License-Identifier: GPL-2.0-only
12 #include <soc/tegra/bpmp.h>
20 	struct tegra_bpmp *bpmp;  member
38  * to control the EMC frequency. The top-level directory can be found here:
44  *   - available_rates: This file contains a list of valid, space-separated
47  *   - min_rate: Writing a value to this file sets the given frequency as the
52  *   - max_rate: Similarily to the min_rate file, writing a value to this file
64 	for (i = 0; i < emc->num_dvfs; i++)  in tegra186_emc_validate_rate()
65 		if (rate == emc->dvfs[i].rate)  in tegra186_emc_validate_rate()
74 	struct tegra186_emc *emc = s->private;  in tegra186_emc_debug_available_rates_show()
78 	for (i = 0; i < emc->num_dvfs; i++) {  in tegra186_emc_debug_available_rates_show()
79 		seq_printf(s, "%s%lu", prefix, emc->dvfs[i].rate);  in tegra186_emc_debug_available_rates_show()
92 			   inode->i_private);  in tegra186_emc_debug_available_rates_open()
106 	*rate = emc->debugfs.min_rate;  in tegra186_emc_debug_min_rate_get()
117 		return -EINVAL;  in tegra186_emc_debug_min_rate_set()
119 	err = clk_set_min_rate(emc->clk, rate);  in tegra186_emc_debug_min_rate_set()
123 	emc->debugfs.min_rate = rate;  in tegra186_emc_debug_min_rate_set()
136 	*rate = emc->debugfs.max_rate;  in tegra186_emc_debug_max_rate_get()
147 		return -EINVAL;  in tegra186_emc_debug_max_rate_set()
149 	err = clk_set_max_rate(emc->clk, rate);  in tegra186_emc_debug_max_rate_set()
153 	emc->debugfs.max_rate = rate;  in tegra186_emc_debug_max_rate_set()
170 	emc = devm_kzalloc(&pdev->dev, sizeof(*emc), GFP_KERNEL);  in tegra186_emc_probe()
172 		return -ENOMEM;  in tegra186_emc_probe()
174 	emc->bpmp = tegra_bpmp_get(&pdev->dev);  in tegra186_emc_probe()
175 	if (IS_ERR(emc->bpmp))  in tegra186_emc_probe()
176 		return dev_err_probe(&pdev->dev, PTR_ERR(emc->bpmp), "failed to get BPMP\n");  in tegra186_emc_probe()
178 	emc->clk = devm_clk_get(&pdev->dev, "emc");  in tegra186_emc_probe()
179 	if (IS_ERR(emc->clk)) {  in tegra186_emc_probe()
180 		err = PTR_ERR(emc->clk);  in tegra186_emc_probe()
181 		dev_err(&pdev->dev, "failed to get EMC clock: %d\n", err);  in tegra186_emc_probe()
186 	emc->dev = &pdev->dev;  in tegra186_emc_probe()
195 	err = tegra_bpmp_transfer(emc->bpmp, &msg);  in tegra186_emc_probe()
197 		dev_err(&pdev->dev, "failed to EMC DVFS pairs: %d\n", err);  in tegra186_emc_probe()
201 		err = -EINVAL;  in tegra186_emc_probe()
202 		dev_err(&pdev->dev, "EMC DVFS MRQ failed: %d (BPMP error code)\n", msg.rx.ret);  in tegra186_emc_probe()
206 	emc->debugfs.min_rate = ULONG_MAX;  in tegra186_emc_probe()
207 	emc->debugfs.max_rate = 0;  in tegra186_emc_probe()
209 	emc->num_dvfs = response.num_pairs;  in tegra186_emc_probe()
211 	emc->dvfs = devm_kmalloc_array(&pdev->dev, emc->num_dvfs,  in tegra186_emc_probe()
212 				       sizeof(*emc->dvfs), GFP_KERNEL);  in tegra186_emc_probe()
213 	if (!emc->dvfs) {  in tegra186_emc_probe()
214 		err = -ENOMEM;  in tegra186_emc_probe()
218 	dev_dbg(&pdev->dev, "%u DVFS pairs:\n", emc->num_dvfs);  in tegra186_emc_probe()
220 	for (i = 0; i < emc->num_dvfs; i++) {  in tegra186_emc_probe()
221 		emc->dvfs[i].rate = response.pairs[i].freq * 1000;  in tegra186_emc_probe()
222 		emc->dvfs[i].latency = response.pairs[i].latency;  in tegra186_emc_probe()
224 		if (emc->dvfs[i].rate < emc->debugfs.min_rate)  in tegra186_emc_probe()
225 			emc->debugfs.min_rate = emc->dvfs[i].rate;  in tegra186_emc_probe()
227 		if (emc->dvfs[i].rate > emc->debugfs.max_rate)  in tegra186_emc_probe()
228 			emc->debugfs.max_rate = emc->dvfs[i].rate;  in tegra186_emc_probe()
230 		dev_dbg(&pdev->dev, "  %2u: %lu Hz -> %lu us\n", i,  in tegra186_emc_probe()
231 			emc->dvfs[i].rate, emc->dvfs[i].latency);  in tegra186_emc_probe()
234 	err = clk_set_rate_range(emc->clk, emc->debugfs.min_rate,  in tegra186_emc_probe()
235 				 emc->debugfs.max_rate);  in tegra186_emc_probe()
237 		dev_err(&pdev->dev,  in tegra186_emc_probe()
238 			"failed to set rate range [%lu-%lu] for %pC\n",  in tegra186_emc_probe()
239 			emc->debugfs.min_rate, emc->debugfs.max_rate,  in tegra186_emc_probe()
240 			emc->clk);  in tegra186_emc_probe()
244 	emc->debugfs.root = debugfs_create_dir("emc", NULL);  in tegra186_emc_probe()
245 	debugfs_create_file("available_rates", S_IRUGO, emc->debugfs.root,  in tegra186_emc_probe()
247 	debugfs_create_file("min_rate", S_IRUGO | S_IWUSR, emc->debugfs.root,  in tegra186_emc_probe()
249 	debugfs_create_file("max_rate", S_IRUGO | S_IWUSR, emc->debugfs.root,  in tegra186_emc_probe()
255 	tegra_bpmp_put(emc->bpmp);  in tegra186_emc_probe()
263 	debugfs_remove_recursive(emc->debugfs.root);  in tegra186_emc_remove()
264 	tegra_bpmp_put(emc->bpmp);  in tegra186_emc_remove()
271 	{ .compatible = "nvidia,tegra186-emc" },
274 	{ .compatible = "nvidia,tegra194-emc" },
277 	{ .compatible = "nvidia,tegra234-emc" },
285 		.name = "tegra186-emc",
295 MODULE_DESCRIPTION("NVIDIA Tegra186 External Memory Controller driver");