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Commit a2c83dbd authored by Santosh Dronamraju's avatar Santosh Dronamraju Committed by Gerrit - the friendly Code Review server
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soc: qcom: spss_utils: Add support for legacy SPSS 



The spss-util driver provides utilities required for the Secure
Processor Subsystem (SPSS). It provides the fuse state for key
selection and the SPSS HW version.
Legacy spss not support load spss by UEFI and also not support
CMAC/IAR feature.

Change-Id: Iea0d66ed66a2817850f99f74bf716d33db956812
Signed-off-by: default avatarSantosh Dronamraju <sdronamr@codeaurora.org>
parent f1a388a8

drivers/soc/qcom/spss_utils.c

+43 −3
Original line number Diff line number Diff line
@@ -66,6 +66,8 @@ static void *iar_notif_handle; 
static struct notifier_block *iar_nb;

static bool is_iar_active;

static bool is_ssr_disabled;

/* To differentiate legacy and new generation of hardware supported features*/

static bool is_cmac_and_iar_feature_supported = true;



#define CMAC_SIZE_IN_BYTES (128/8) /* 128 bit = 16 bytes */

#define CMAC_SIZE_IN_DWORDS (CMAC_SIZE_IN_BYTES/sizeof(u32)) /* 4 dwords */
@@ -291,7 +293,11 @@ static int spss_create_sysfs(struct device *dev) 
		goto remove_test_fuse_state;

	}



	if (!is_cmac_and_iar_feature_supported)

		goto out;



	ret = device_create_file(dev, &dev_attr_calc_fw_cmac);



	if (ret < 0) {

		pr_err("failed to create sysfs file for calc_fw_cmac.\n");

		goto remove_spss_debug_reg;
@@ -303,7 +309,7 @@ static int spss_create_sysfs(struct device *dev) 
		goto remove_calc_fw_cmac;

	}





out:

	return 0;



remove_calc_fw_cmac:
@@ -320,8 +326,10 @@ static int spss_create_sysfs(struct device *dev) 
static void spss_destroy_sysfs(struct device *dev)

{



	if (is_cmac_and_iar_feature_supported) {

		device_remove_file(dev, &dev_attr_calc_apps_cmac);

		device_remove_file(dev, &dev_attr_calc_fw_cmac);

	}

	device_remove_file(dev, &dev_attr_spss_debug_reg);

	device_remove_file(dev, &dev_attr_test_fuse_state);

	device_remove_file(dev, &dev_attr_firmware_name);
@@ -521,6 +529,11 @@ static long spss_utils_ioctl(struct file *file, 
	case SPSS_IOC_SET_FW_AND_APPS_CMAC:

		pr_debug("ioctl [SPSS_IOC_SET_FW_AND_APPS_CMAC]\n");



		if (!is_cmac_and_iar_feature_supported) {

			pr_err("legacy SPSS not support cmac,iar feature.\n");

			return -EINVAL;

		}



		/* spdaemon uses this ioctl only when IAR is active */

		is_iar_active = true;
@@ -861,6 +874,10 @@ static int spss_parse_dt(struct device_node *node) 
	}

	iounmap(spss_emul_type_reg);



	if (!is_cmac_and_iar_feature_supported) {

		pr_info("legacy SPSS not support cmac & iar feature.\n");

		goto out;

	}

	/* PIL-SPSS area */

	np = of_parse_phandle(node, "pil-mem", 0);

	if (!np) {
@@ -898,6 +915,7 @@ static int spss_parse_dt(struct device_node *node) 
	memset(saved_fw_cmac, 0xA5, sizeof(saved_fw_cmac));

	memset(saved_apps_cmac, 0xA5, sizeof(saved_apps_cmac));



out:

	return 0;

}
@@ -1071,6 +1089,11 @@ static int spss_utils_pil_callback(struct notifier_block *nb, 
		break;

	case SUBSYS_BEFORE_POWERUP:

		pr_info("[SUBSYS_BEFORE_POWERUP] event.\n");



		if (!is_cmac_and_iar_feature_supported) {

			pr_info("legacy SPSS not support cmac,iar feature.\n");

			break;

		}

		if (is_iar_active && is_ssr_disabled) {

			pr_err("SPSS SSR disabled, requesting reboot\n");

			kernel_restart("SPSS SSR disabled, requesting reboot");
@@ -1088,6 +1111,10 @@ static int spss_utils_pil_callback(struct notifier_block *nb, 
		spss_events_signaled[event_id] = false;

		mutex_unlock(&event_lock);



		if (!is_cmac_and_iar_feature_supported) {

			pr_info("legacy SPSS not support cmac,iar feature.\n");

			break;

		}

		/*

		 * For IAR-DB-Recovery, read cmac regadless of is_iar_active.

		 * please notice that HYP unmap this area, it is a race.
@@ -1114,6 +1141,11 @@ static int spss_utils_pil_callback(struct notifier_block *nb, 
		break;

	case SUBSYS_BEFORE_AUTH_AND_RESET:

		pr_debug("[SUBSYS_BEFORE_AUTH_AND_RESET] event.\n");



		if (!is_cmac_and_iar_feature_supported) {

			pr_info("legacy SPSS not support cmac,iar feature.\n");

			break;

		}

		/* do nothing if IAR is not active */

		if (!is_iar_active)

			return NOTIFY_OK;
@@ -1144,6 +1176,14 @@ static int spss_probe(struct platform_device *pdev) 
	spss_dev = dev;



	platform_set_drvdata(pdev, dev);

	/* Based on flag will differentiate legacy spss

	 * supported features

	 */

	if (of_property_read_bool(pdev->dev.of_node,

				"qcom,no-cmac-and-iar-feature-support")) {

		pr_info("legacy SPSS not support cmac & iar feature.\n");

		is_cmac_and_iar_feature_supported = false;

	}



	ret = spss_parse_dt(np);

	if (ret < 0)