Merge "msm: CDSP: add CDSP loader driver"

drivers/soc/qcom/Kconfig

@@ -378,4 +378,12 @@ config SENSORS_SSC
 	  exercising sensor use-cases. This driver loads firmware files
 	  for SSC and also does time synchronization with DSP clock.
 
+config MSM_CDSP_LOADER
+	tristate "CDSP loader support"
+	help
+	  This enables the CDSP loader driver that loads the CDSP
+	  firmware images and brings the compute DSP out of reset
+	  for platforms that have one.
+	  Say M if you want to enable this module.
+
 endmenu

drivers/soc/qcom/Makefile

@@ -9,6 +9,7 @@ obj-$(CONFIG_QCOM_MDT_LOADER)	+= mdt_loader.o
 obj-$(CONFIG_QCOM_PM)	+=	spm.o
 obj-$(CONFIG_MSM_PIL)   +=      peripheral-loader.o
 obj-$(CONFIG_MSM_SUBSYSTEM_RESTART) += ssr.o
+obj-$(CONFIG_MSM_CDSP_LOADER) += qdsp6v2/
 ssr-y := subsystem_restart.o subsystem_notif.o ramdump.o sysmon-qmi.o
 obj-$(CONFIG_MSM_PIL_SSR_GENERIC) += subsys-pil-tz.o
 obj-$(CONFIG_MSM_SERVICE_NOTIFIER) += service-notifier.o

drivers/soc/qcom/qdsp6v2/Makefile

@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_MSM_CDSP_LOADER) += cdsp-loader.o

drivers/soc/qcom/qdsp6v2/cdsp-loader.c

@@ -0,0 +1,268 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2012-2014, 2017-2019, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/of_device.h>
+#include <linux/sysfs.h>
+#include <soc/qcom/subsystem_restart.h>
+
+#define BOOT_CMD 1
+#define IMAGE_UNLOAD_CMD 0
+
+#define CDSP_SUBSYS_DOWN 0
+#define CDSP_SUBSYS_LOADED 1
+
+static ssize_t cdsp_boot_store(struct kobject *kobj,
+	struct kobj_attribute *attr,
+	const char *buf, size_t count);
+
+struct cdsp_loader_private {
+	void *pil_h;
+	struct kobject *boot_cdsp_obj;
+	struct attribute_group *attr_group;
+};
+
+static struct kobj_attribute cdsp_boot_attribute =
+	__ATTR(boot, 0220, NULL, cdsp_boot_store);
+
+static struct attribute *attrs[] = {
+	&cdsp_boot_attribute.attr,
+	NULL,
+};
+
+static u32 cdsp_state = CDSP_SUBSYS_DOWN;
+static struct platform_device *cdsp_private;
+static void cdsp_loader_unload(struct platform_device *pdev);
+
+static int cdsp_loader_do(struct platform_device *pdev)
+{
+	struct cdsp_loader_private *priv = NULL;
+
+	int rc = 0;
+	const char *img_name;
+
+	if (!pdev) {
+		pr_err("%s: Platform device null\n", __func__);
+		goto fail;
+	}
+
+	if (!pdev->dev.of_node) {
+		dev_err(&pdev->dev,
+			"%s: Device tree information missing\n", __func__);
+
+		goto fail;
+	}
+
+	rc = of_property_read_string(pdev->dev.of_node,
+					"qcom,proc-img-to-load",
+					&img_name);
+	if (rc)
+		goto fail;
+
+	if (!strcmp(img_name, "cdsp")) {
+		/* cdsp_state always returns "0".*/
+		if (cdsp_state == CDSP_SUBSYS_DOWN) {
+			priv = platform_get_drvdata(pdev);
+			if (!priv) {
+				dev_err(&pdev->dev,
+				"%s: Private data get failed\n", __func__);
+				goto fail;
+			}
+
+			dev_dbg(&pdev->dev, "%s: calling subsystem_get on %s\n",
+					__func__, img_name);
+			priv->pil_h = subsystem_get("cdsp");
+			if (IS_ERR(priv->pil_h)) {
+				dev_err(&pdev->dev, "%s: subsystem_get failed with error %d\n",
+					__func__, (int)(PTR_ERR(priv->pil_h)));
+				goto fail;
+			}
+
+			/* Set the state of the CDSP.*/
+			cdsp_state = CDSP_SUBSYS_LOADED;
+		} else if (cdsp_state == CDSP_SUBSYS_LOADED) {
+			dev_dbg(&pdev->dev,
+			"%s: CDSP state = 0x%x\n", __func__, cdsp_state);
+		}
+
+		dev_dbg(&pdev->dev, "%s: CDSP image is loaded\n", __func__);
+		return rc;
+	}
+
+fail:
+	if (pdev)
+		dev_err(&pdev->dev,
+			"%s: CDSP image loading failed\n", __func__);
+	return rc;
+}
+
+
+static ssize_t cdsp_boot_store(struct kobject *kobj,
+	struct kobj_attribute *attr,
+	const char *buf,
+	size_t count)
+{
+	int ret = 0;
+	uint32_t boot = 0;
+
+	ret = kstrtou32(buf, 0, &boot);
+	if (ret) {
+		pr_debug("%s: invalid arguments for cdsp_loader.\n", __func__);
+		return ret;
+	}
+
+	if (boot == BOOT_CMD) {
+		pr_debug("%s: going to call cdsp_loader_do\n", __func__);
+		cdsp_loader_do(cdsp_private);
+	} else if (boot == IMAGE_UNLOAD_CMD) {
+		pr_debug("%s: going to call cdsp_unloader\n", __func__);
+		cdsp_loader_unload(cdsp_private);
+	}
+	return count;
+}
+
+static void cdsp_loader_unload(struct platform_device *pdev)
+{
+	struct cdsp_loader_private *priv = NULL;
+
+	priv = platform_get_drvdata(pdev);
+
+	if (!priv)
+		return;
+
+	if (priv->pil_h) {
+		dev_dbg(&pdev->dev, "%s: calling subsystem_put\n", __func__);
+		subsystem_put(priv->pil_h);
+		priv->pil_h = NULL;
+	}
+}
+
+static int cdsp_loader_init_sysfs(struct platform_device *pdev)
+{
+	int ret = -EINVAL;
+	struct cdsp_loader_private *priv = NULL;
+
+	cdsp_private = NULL;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv) {
+		ret = -ENOMEM;
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, priv);
+
+	priv->pil_h = NULL;
+	priv->boot_cdsp_obj = NULL;
+	priv->attr_group = devm_kzalloc(&pdev->dev,
+				sizeof(*(priv->attr_group)),
+				GFP_KERNEL);
+	if (!priv->attr_group) {
+		ret = -ENOMEM;
+		goto error_return;
+	}
+
+	priv->attr_group->attrs = attrs;
+
+	priv->boot_cdsp_obj = kobject_create_and_add("boot_cdsp", kernel_kobj);
+	if (!priv->boot_cdsp_obj) {
+		dev_err(&pdev->dev, "%s: sysfs create and add failed\n",
+						__func__);
+		ret = -ENOMEM;
+		goto error_return;
+	}
+
+	ret = sysfs_create_group(priv->boot_cdsp_obj, priv->attr_group);
+	if (ret) {
+		dev_err(&pdev->dev, "%s: sysfs create group failed %d\n",
+							__func__, ret);
+		goto error_return;
+	}
+
+	cdsp_private = pdev;
+
+	return 0;
+
+error_return:
+
+	if (priv->boot_cdsp_obj) {
+		kobject_del(priv->boot_cdsp_obj);
+		priv->boot_cdsp_obj = NULL;
+	}
+	if (ret)
+		dev_err(&pdev->dev, "%s failed with ret %d\n",
+						__func__, ret);
+	return ret;
+}
+
+static int cdsp_loader_remove(struct platform_device *pdev)
+{
+	struct cdsp_loader_private *priv = NULL;
+
+	priv = platform_get_drvdata(pdev);
+
+	if (!priv)
+		return 0;
+
+	if (priv->pil_h) {
+		subsystem_put(priv->pil_h);
+		priv->pil_h = NULL;
+	}
+
+	if (priv->boot_cdsp_obj) {
+		sysfs_remove_group(priv->boot_cdsp_obj, priv->attr_group);
+		kobject_del(priv->boot_cdsp_obj);
+		priv->boot_cdsp_obj = NULL;
+	}
+
+	return 0;
+}
+
+static int cdsp_loader_probe(struct platform_device *pdev)
+{
+	int ret = cdsp_loader_init_sysfs(pdev);
+
+	if (ret != 0) {
+		dev_err(&pdev->dev, "%s: Error in initing sysfs\n", __func__);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct of_device_id cdsp_loader_dt_match[] = {
+	{ .compatible = "qcom,cdsp-loader" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, cdsp_loader_dt_match);
+
+static struct platform_driver cdsp_loader_driver = {
+	.driver = {
+		.name = "cdsp-loader",
+		.of_match_table = cdsp_loader_dt_match,
+	},
+	.probe = cdsp_loader_probe,
+	.remove = cdsp_loader_remove,
+};
+
+static int __init cdsp_loader_init(void)
+{
+	return platform_driver_register(&cdsp_loader_driver);
+}
+module_init(cdsp_loader_init);
+
+static void __exit cdsp_loader_exit(void)
+{
+	platform_driver_unregister(&cdsp_loader_driver);
+}
+module_exit(cdsp_loader_exit);
+
+MODULE_DESCRIPTION("CDSP Loader module");
+MODULE_LICENSE("GPL v2");