1 // SPDX-License-Identifier: GPL-2.0
3  * Qualcomm ICE (Inline Crypto Engine) support.
5  * Copyright (c) 2013-2019, The Linux Foundation. All rights reserved.
32 /* BIST ("built-in self-test") status flags */
39 #define qcom_ice_writel(engine, val, reg)	\  argument
40 	writel((val), (engine)->base + (reg))
42 #define qcom_ice_readl(engine, reg)	\  argument
43 	readl((engine)->base + (reg))
55 	struct device *dev = ice->dev;  in qcom_ice_check_supported()
67 	dev_info(dev, "Found QC Inline Crypto Engine (ICE) v%d.%d.%d\n",  in qcom_ice_check_supported()
107  * Wait until the ICE BIST (built-in self-test) has completed.
113  * practice, (b) ICE is documented to reject crypto requests if the BIST
116  * and not relying on hardware-level self-tests.
123 	err = readl_poll_timeout(ice->base + QCOM_ICE_REG_BIST_STATUS,  in qcom_ice_wait_bist_status()
127 		dev_err(ice->dev, "Timed out waiting for ICE self-test to complete\n");  in qcom_ice_wait_bist_status()
143 	struct device *dev = ice->dev;  in qcom_ice_resume()
146 	err = clk_prepare_enable(ice->core_clk);  in qcom_ice_resume()
159 	clk_disable_unprepare(ice->core_clk);  in qcom_ice_suspend()
170 	struct device *dev = ice->dev;  in qcom_ice_program_key()
178 	/* Only AES-256-XTS has been tested so far. */  in qcom_ice_program_key()
182 				    "Unhandled crypto capability; algorithm_id=%d, key_size=%d\n",  in qcom_ice_program_key()
184 		return -EINVAL;  in qcom_ice_program_key()
212 	struct qcom_ice *engine;  in qcom_ice_create()  local
215 		return ERR_PTR(-EPROBE_DEFER);  in qcom_ice_create()
222 	engine = devm_kzalloc(dev, sizeof(*engine), GFP_KERNEL);  in qcom_ice_create()
223 	if (!engine)  in qcom_ice_create()
224 		return ERR_PTR(-ENOMEM);  in qcom_ice_create()
226 	engine->dev = dev;  in qcom_ice_create()
227 	engine->base = base;  in qcom_ice_create()
236 	engine->core_clk = devm_clk_get_optional_enabled(dev, "ice_core_clk");  in qcom_ice_create()
237 	if (!engine->core_clk)  in qcom_ice_create()
238 		engine->core_clk = devm_clk_get_optional_enabled(dev, "ice");  in qcom_ice_create()
239 	if (!engine->core_clk)  in qcom_ice_create()
240 		engine->core_clk = devm_clk_get_enabled(dev, NULL);  in qcom_ice_create()
241 	if (IS_ERR(engine->core_clk))  in qcom_ice_create()
242 		return ERR_CAST(engine->core_clk);  in qcom_ice_create()
244 	if (!qcom_ice_check_supported(engine))  in qcom_ice_create()
245 		return ERR_PTR(-EOPNOTSUPP);  in qcom_ice_create()
247 	dev_dbg(dev, "Registered Qualcomm Inline Crypto Engine\n");  in qcom_ice_create()
249 	return engine;  in qcom_ice_create()
253  * of_qcom_ice_get() - get an ICE instance from a DT node
273 	if (!dev || !dev->of_node)  in of_qcom_ice_get()
274 		return ERR_PTR(-ENODEV);  in of_qcom_ice_get()
283 		base = devm_ioremap_resource(&pdev->dev, res);  in of_qcom_ice_get()
288 		return qcom_ice_create(&pdev->dev, base);  in of_qcom_ice_get()
296 	struct device_node *node __free(device_node) = of_parse_phandle(dev->of_node,  in of_qcom_ice_get()
303 		dev_err(dev, "Cannot find device node %s\n", node->name);  in of_qcom_ice_get()
304 		return ERR_PTR(-EPROBE_DEFER);  in of_qcom_ice_get()
310 			dev_name(&pdev->dev));  in of_qcom_ice_get()
312 		return ERR_PTR(-EPROBE_DEFER);  in of_qcom_ice_get()
315 	link = device_link_add(dev, &pdev->dev, DL_FLAG_AUTOREMOVE_SUPPLIER);  in of_qcom_ice_get()
317 		dev_err(&pdev->dev,  in of_qcom_ice_get()
321 		ice = ERR_PTR(-EINVAL);  in of_qcom_ice_get()
329 	struct platform_device *pdev = to_platform_device(ice->dev);  in qcom_ice_put()
341  * devm_of_qcom_ice_get() - Devres managed helper to get an ICE instance from
360 		return ERR_PTR(-ENOMEM);  in devm_of_qcom_ice_get()
376 	struct qcom_ice *engine;  in qcom_ice_probe()  local
381 		dev_warn(&pdev->dev, "ICE registers not found\n");  in qcom_ice_probe()
385 	engine = qcom_ice_create(&pdev->dev, base);  in qcom_ice_probe()
386 	if (IS_ERR(engine))  in qcom_ice_probe()
387 		return PTR_ERR(engine);  in qcom_ice_probe()
389 	platform_set_drvdata(pdev, engine);  in qcom_ice_probe()
395 	{ .compatible = "qcom,inline-crypto-engine" },
403 		.name = "qcom-ice",
410 MODULE_DESCRIPTION("Qualcomm Inline Crypto Engine driver");