3  * Qualcomm ICE (Inline Crypto Engine) support.
21 #include <soc/qcom/ice.h>
25 /* QCOM ICE registers */
51 static bool qcom_ice_check_supported(struct qcom_ice *ice)  in qcom_ice_check_supported()  argument
53 	u32 regval = qcom_ice_readl(ice, QCOM_ICE_REG_VERSION);  in qcom_ice_check_supported()
54 	struct device *dev = ice->dev;  in qcom_ice_check_supported()
59 	/* For now this driver only supports ICE version 3 and 4. */  in qcom_ice_check_supported()
61 		dev_warn(dev, "Unsupported ICE version: v%d.%d.%d\n",  in qcom_ice_check_supported()
66 	dev_info(dev, "Found QC Inline Crypto Engine (ICE) v%d.%d.%d\n",  in qcom_ice_check_supported()
69 	/* If fuses are blown, ICE might not work in the standard way. */  in qcom_ice_check_supported()
70 	regval = qcom_ice_readl(ice, QCOM_ICE_REG_FUSE_SETTING);  in qcom_ice_check_supported()
74 		dev_warn(dev, "Fuses are blown; ICE is unusable!\n");  in qcom_ice_check_supported()
81 static void qcom_ice_low_power_mode_enable(struct qcom_ice *ice)  in qcom_ice_low_power_mode_enable()  argument
85 	regval = qcom_ice_readl(ice, QCOM_ICE_REG_ADVANCED_CONTROL);  in qcom_ice_low_power_mode_enable()
89 	qcom_ice_writel(ice, regval, QCOM_ICE_REG_ADVANCED_CONTROL);  in qcom_ice_low_power_mode_enable()
92 static void qcom_ice_optimization_enable(struct qcom_ice *ice)  in qcom_ice_optimization_enable()  argument
96 	/* ICE Optimizations Enable Sequence */  in qcom_ice_optimization_enable()
97 	regval = qcom_ice_readl(ice, QCOM_ICE_REG_ADVANCED_CONTROL);  in qcom_ice_optimization_enable()
99 	/* ICE HPG requires delay before writing */  in qcom_ice_optimization_enable()
101 	qcom_ice_writel(ice, regval, QCOM_ICE_REG_ADVANCED_CONTROL);  in qcom_ice_optimization_enable()
106  * Wait until the ICE BIST (built-in self-test) has completed.
108  * This may be necessary before ICE can be used.
112  * practice, (b) ICE is documented to reject crypto requests if the BIST
117 static int qcom_ice_wait_bist_status(struct qcom_ice *ice)  in qcom_ice_wait_bist_status()  argument
122 	err = readl_poll_timeout(ice->base + QCOM_ICE_REG_BIST_STATUS,  in qcom_ice_wait_bist_status()
126 		dev_err(ice->dev, "Timed out waiting for ICE self-test to complete\n");  in qcom_ice_wait_bist_status()
131 int qcom_ice_enable(struct qcom_ice *ice)  in qcom_ice_enable()  argument
133 	qcom_ice_low_power_mode_enable(ice);  in qcom_ice_enable()
134 	qcom_ice_optimization_enable(ice);  in qcom_ice_enable()
136 	return qcom_ice_wait_bist_status(ice);  in qcom_ice_enable()
140 int qcom_ice_resume(struct qcom_ice *ice)  in qcom_ice_resume()  argument
142 	struct device *dev = ice->dev;  in qcom_ice_resume()
145 	err = clk_prepare_enable(ice->core_clk);  in qcom_ice_resume()
152 	return qcom_ice_wait_bist_status(ice);  in qcom_ice_resume()
156 int qcom_ice_suspend(struct qcom_ice *ice)  in qcom_ice_suspend()  argument
158 	clk_disable_unprepare(ice->core_clk);  in qcom_ice_suspend()
164 int qcom_ice_program_key(struct qcom_ice *ice,  in qcom_ice_program_key()  argument
169 	struct device *dev = ice->dev;  in qcom_ice_program_key()
202 int qcom_ice_evict_key(struct qcom_ice *ice, int slot)  in qcom_ice_evict_key()  argument
217 		dev_warn(dev, "ICE SCM interface not found\n");  in qcom_ice_create()
237 		engine->core_clk = devm_clk_get_optional_enabled(dev, "ice");  in qcom_ice_create()
252  * of_qcom_ice_get() - get an ICE instance from a DT node
255  * This function will provide an ICE instance either by creating one for the
256  * consumer device if its DT node provides the 'ice' reg range and the 'ice'
258  * phandle via 'qcom,ice' property to an ICE DT, the ICE instance will already
261  * Return: ICE pointer on success, NULL if there is no ICE data provided by the
267 	struct qcom_ice *ice;  in of_qcom_ice_get()  local
277 	 * to create the ICE instance using the consumer device and the reg  in of_qcom_ice_get()
278 	 * range called 'ice' it provides.  in of_qcom_ice_get()
280 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ice");  in of_qcom_ice_get()
286 		/* create ICE instance using consumer dev */  in of_qcom_ice_get()
291 	 * If the consumer node does not provider an 'ice' reg range  in of_qcom_ice_get()
293 	 * to the ICE devicetree node, otherwise ICE is not supported.  in of_qcom_ice_get()
296 									"qcom,ice", 0);  in of_qcom_ice_get()
306 	ice = platform_get_drvdata(pdev);  in of_qcom_ice_get()
307 	if (!ice) {  in of_qcom_ice_get()
308 		dev_err(dev, "Cannot get ice instance from %s\n",  in of_qcom_ice_get()
320 		ice = ERR_PTR(-EINVAL);  in of_qcom_ice_get()
323 	return ice;  in of_qcom_ice_get()
334 		dev_warn(&pdev->dev, "ICE registers not found\n");  in qcom_ice_probe()
356 		.name = "qcom-ice",