3  * Qualcomm ICE (Inline Crypto Engine) support.
22 #include <soc/qcom/ice.h>
26 /* QCOM ICE registers */
52 static bool qcom_ice_check_supported(struct qcom_ice *ice)  in qcom_ice_check_supported()  argument
54 	u32 regval = qcom_ice_readl(ice, QCOM_ICE_REG_VERSION);  in qcom_ice_check_supported()
55 	struct device *dev = ice->dev;  in qcom_ice_check_supported()
60 	/* For now this driver only supports ICE version 3 and 4. */  in qcom_ice_check_supported()
62 		dev_warn(dev, "Unsupported ICE version: v%d.%d.%d\n",  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()
70 	/* If fuses are blown, ICE might not work in the standard way. */  in qcom_ice_check_supported()
71 	regval = qcom_ice_readl(ice, QCOM_ICE_REG_FUSE_SETTING);  in qcom_ice_check_supported()
75 		dev_warn(dev, "Fuses are blown; ICE is unusable!\n");  in qcom_ice_check_supported()
82 static void qcom_ice_low_power_mode_enable(struct qcom_ice *ice)  in qcom_ice_low_power_mode_enable()  argument
86 	regval = qcom_ice_readl(ice, QCOM_ICE_REG_ADVANCED_CONTROL);  in qcom_ice_low_power_mode_enable()
90 	qcom_ice_writel(ice, regval, QCOM_ICE_REG_ADVANCED_CONTROL);  in qcom_ice_low_power_mode_enable()
93 static void qcom_ice_optimization_enable(struct qcom_ice *ice)  in qcom_ice_optimization_enable()  argument
97 	/* ICE Optimizations Enable Sequence */  in qcom_ice_optimization_enable()
98 	regval = qcom_ice_readl(ice, QCOM_ICE_REG_ADVANCED_CONTROL);  in qcom_ice_optimization_enable()
100 	/* ICE HPG requires delay before writing */  in qcom_ice_optimization_enable()
102 	qcom_ice_writel(ice, regval, QCOM_ICE_REG_ADVANCED_CONTROL);  in qcom_ice_optimization_enable()
107  * Wait until the ICE BIST (built-in self-test) has completed.
109  * This may be necessary before ICE can be used.
113  * practice, (b) ICE is documented to reject crypto requests if the BIST
118 static int qcom_ice_wait_bist_status(struct qcom_ice *ice)  in qcom_ice_wait_bist_status()  argument
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()
132 int qcom_ice_enable(struct qcom_ice *ice)  in qcom_ice_enable()  argument
134 	qcom_ice_low_power_mode_enable(ice);  in qcom_ice_enable()
135 	qcom_ice_optimization_enable(ice);  in qcom_ice_enable()
137 	return qcom_ice_wait_bist_status(ice);  in qcom_ice_enable()
141 int qcom_ice_resume(struct qcom_ice *ice)  in qcom_ice_resume()  argument
143 	struct device *dev = ice->dev;  in qcom_ice_resume()
146 	err = clk_prepare_enable(ice->core_clk);  in qcom_ice_resume()
153 	return qcom_ice_wait_bist_status(ice);  in qcom_ice_resume()
157 int qcom_ice_suspend(struct qcom_ice *ice)  in qcom_ice_suspend()  argument
159 	clk_disable_unprepare(ice->core_clk);  in qcom_ice_suspend()
165 int qcom_ice_program_key(struct qcom_ice *ice,  in qcom_ice_program_key()  argument
170 	struct device *dev = ice->dev;  in qcom_ice_program_key()
203 int qcom_ice_evict_key(struct qcom_ice *ice, int slot)  in qcom_ice_evict_key()  argument
218 		dev_warn(dev, "ICE SCM interface not found\n");  in qcom_ice_create()
238 		engine->core_clk = devm_clk_get_optional_enabled(dev, "ice");  in qcom_ice_create()
253  * of_qcom_ice_get() - get an ICE instance from a DT node
256  * This function will provide an ICE instance either by creating one for the
257  * consumer device if its DT node provides the 'ice' reg range and the 'ice'
259  * phandle via 'qcom,ice' property to an ICE DT, the ICE instance will already
262  * Return: ICE pointer on success, NULL if there is no ICE data provided by the
268 	struct qcom_ice *ice;  in of_qcom_ice_get()  local
278 	 * to create the ICE instance using the consumer device and the reg  in of_qcom_ice_get()
279 	 * range called 'ice' it provides.  in of_qcom_ice_get()
281 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ice");  in of_qcom_ice_get()
287 		/* create ICE instance using consumer dev */  in of_qcom_ice_get()
292 	 * If the consumer node does not provider an 'ice' reg range  in of_qcom_ice_get()
294 	 * to the ICE devicetree node, otherwise ICE is not supported.  in of_qcom_ice_get()
297 									"qcom,ice", 0);  in of_qcom_ice_get()
307 	ice = platform_get_drvdata(pdev);  in of_qcom_ice_get()
308 	if (!ice) {  in of_qcom_ice_get()
309 		dev_err(dev, "Cannot get ice instance from %s\n",  in of_qcom_ice_get()
321 		ice = ERR_PTR(-EINVAL);  in of_qcom_ice_get()
324 	return ice;  in of_qcom_ice_get()
327 static void qcom_ice_put(const struct qcom_ice *ice)  in qcom_ice_put()  argument
329 	struct platform_device *pdev = to_platform_device(ice->dev);  in qcom_ice_put()
331 	if (!platform_get_resource_byname(pdev, IORESOURCE_MEM, "ice"))  in qcom_ice_put()
341  * devm_of_qcom_ice_get() - Devres managed helper to get an ICE instance from
345  * This function will provide an ICE instance either by creating one for the
346  * consumer device if its DT node provides the 'ice' reg range and the 'ice'
348  * phandle via 'qcom,ice' property to an ICE DT, the ICE instance will already
351  * Return: ICE pointer on success, NULL if there is no ICE data provided by the
356 	struct qcom_ice *ice, **dr;  in devm_of_qcom_ice_get()  local
362 	ice = of_qcom_ice_get(dev);  in devm_of_qcom_ice_get()
363 	if (!IS_ERR_OR_NULL(ice)) {  in devm_of_qcom_ice_get()
364 		*dr = ice;  in devm_of_qcom_ice_get()
370 	return ice;  in devm_of_qcom_ice_get()
381 		dev_warn(&pdev->dev, "ICE registers not found\n");  in qcom_ice_probe()
403 		.name = "qcom-ice",