1 files changed, 305 insertions, 0 deletions
diff --git a/drivers/soc/qcom/qdsp6v2/adsp-loader.c b/drivers/soc/qcom/qdsp6v2/adsp-loader.c
new file mode 100644
index 000000000000..51539a36a74f
--- /dev/null
+++ b/drivers/soc/qcom/qdsp6v2/adsp-loader.c
@@ -0,0 +1,305 @@
+/*
+ * Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#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/qdsp6v2/apr.h>
+#include <linux/of_device.h>
+#include <linux/sysfs.h>
+#include <soc/qcom/subsystem_restart.h>
+
+#define Q6_PIL_GET_DELAY_MS 100
+#define BOOT_CMD 1
+#define IMAGE_UNLOAD_CMD 0
+
+static ssize_t adsp_boot_store(struct kobject *kobj,
+	struct kobj_attribute *attr,
+	const char *buf, size_t count);
+
+struct adsp_loader_private {
+	void *pil_h;
+	struct kobject *boot_adsp_obj;
+	struct attribute_group *attr_group;
+};
+
+static struct kobj_attribute adsp_boot_attribute =
+	__ATTR(boot, 0220, NULL, adsp_boot_store);
+
+static struct attribute *attrs[] = {
+	&adsp_boot_attribute.attr,
+	NULL,
+};
+
+static struct platform_device *adsp_private;
+static void adsp_loader_unload(struct platform_device *pdev);
+
+static void adsp_loader_do(struct platform_device *pdev)
+{
+
+	struct adsp_loader_private *priv = NULL;
+
+	const char *adsp_dt = "qcom,adsp-state";
+	int rc = 0;
+	u32 adsp_state;
+	const char *img_name;
+
+	if (!pdev) {
+		dev_err(&pdev->dev, "%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_u32(pdev->dev.of_node, adsp_dt, &adsp_state);
+	if (rc) {
+		dev_err(&pdev->dev,
+			"%s: ADSP state = %x\n", __func__, adsp_state);
+		goto fail;
+	}
+
+	rc = of_property_read_string(pdev->dev.of_node,
+					"qcom,proc-img-to-load",
+					&img_name);
+
+	if (rc) {
+		dev_dbg(&pdev->dev,
+			"%s: loading default image ADSP\n", __func__);
+		goto load_adsp;
+	}
+	if (!strcmp(img_name, "modem")) {
+		/* adsp_state always returns "0". So load modem image based on
+		apr_modem_state to prevent loading of image twice */
+		adsp_state = apr_get_modem_state();
+		if (adsp_state == APR_SUBSYS_DOWN) {
+			priv = platform_get_drvdata(pdev);
+			if (!priv) {
+				dev_err(&pdev->dev,
+				" %s: Private data get failed\n", __func__);
+				goto fail;
+			}
+
+			priv->pil_h = subsystem_get("modem");
+			if (IS_ERR(priv->pil_h)) {
+				dev_err(&pdev->dev, "%s: pil get failed,\n",
+					__func__);
+				goto fail;
+			}
+
+			/* Set the state of the ADSP in APR driver */
+			apr_set_modem_state(APR_SUBSYS_LOADED);
+		} else if (adsp_state == APR_SUBSYS_LOADED) {
+			dev_dbg(&pdev->dev,
+			"%s: MDSP state = %x\n", __func__, adsp_state);
+		}
+
+		dev_dbg(&pdev->dev, "%s: Q6/MDSP image is loaded\n", __func__);
+		return;
+	}
+load_adsp:
+	{
+		adsp_state = apr_get_q6_state();
+		if (adsp_state == APR_SUBSYS_DOWN) {
+			priv = platform_get_drvdata(pdev);
+			if (!priv) {
+				dev_err(&pdev->dev,
+				" %s: Private data get failed\n", __func__);
+				goto fail;
+			}
+
+			priv->pil_h = subsystem_get("adsp");
+			if (IS_ERR(priv->pil_h)) {
+				dev_err(&pdev->dev, "%s: pil get failed,\n",
+					__func__);
+				goto fail;
+			}
+
+			/* Set the state of the ADSP in APR driver */
+			apr_set_q6_state(APR_SUBSYS_LOADED);
+		} else if (adsp_state == APR_SUBSYS_LOADED) {
+			dev_dbg(&pdev->dev,
+			"%s: ADSP state = %x\n", __func__, adsp_state);
+		}
+
+		dev_dbg(&pdev->dev, "%s: Q6/ADSP image is loaded\n", __func__);
+		return;
+	}
+fail:
+	dev_err(&pdev->dev, "%s: Q6 image loading failed\n", __func__);
+	return;
+}
+
+
+static ssize_t adsp_boot_store(struct kobject *kobj,
+	struct kobj_attribute *attr,
+	const char *buf,
+	size_t count)
+{
+	int boot = 0;
+	sscanf(buf, "%du", &boot);
+
+	if (boot == BOOT_CMD) {
+		pr_debug("%s: going to call adsp_loader_do\n", __func__);
+		adsp_loader_do(adsp_private);
+	} else if (boot == IMAGE_UNLOAD_CMD) {
+		pr_debug("%s: going to call adsp_unloader\n", __func__);
+		adsp_loader_unload(adsp_private);
+	}
+	return count;
+}
+
+static void adsp_loader_unload(struct platform_device *pdev)
+{
+	struct adsp_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 adsp_loader_init_sysfs(struct platform_device *pdev)
+{
+	int ret = -EINVAL;
+	struct adsp_loader_private *priv = NULL;
+	adsp_private = NULL;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv) {
+		dev_err(&pdev->dev, "%s: memory alloc failed\n", __func__);
+		ret = -ENOMEM;
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, priv);
+
+	priv->pil_h = NULL;
+	priv->boot_adsp_obj = NULL;
+	priv->attr_group = devm_kzalloc(&pdev->dev,
+				sizeof(*(priv->attr_group)),
+				GFP_KERNEL);
+	if (!priv->attr_group) {
+		dev_err(&pdev->dev, "%s: malloc attr_group failed\n",
+						__func__);
+		ret = -ENOMEM;
+		goto error_return;
+	}
+
+	priv->attr_group->attrs = attrs;
+
+	priv->boot_adsp_obj = kobject_create_and_add("boot_adsp", kernel_kobj);
+	if (!priv->boot_adsp_obj) {
+		dev_err(&pdev->dev, "%s: sysfs create and add failed\n",
+						__func__);
+		ret = -ENOMEM;
+		goto error_return;
+	}
+
+	ret = sysfs_create_group(priv->boot_adsp_obj, priv->attr_group);
+	if (ret) {
+		dev_err(&pdev->dev, "%s: sysfs create group failed %d\n",
+							__func__, ret);
+		goto error_return;
+	}
+
+	adsp_private = pdev;
+
+	return 0;
+
+error_return:
+
+	if (priv->boot_adsp_obj) {
+		kobject_del(priv->boot_adsp_obj);
+		priv->boot_adsp_obj = NULL;
+	}
+
+	return ret;
+}
+
+static int adsp_loader_remove(struct platform_device *pdev)
+{
+	struct adsp_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_adsp_obj) {
+		sysfs_remove_group(priv->boot_adsp_obj, priv->attr_group);
+		kobject_del(priv->boot_adsp_obj);
+		priv->boot_adsp_obj = NULL;
+	}
+
+	return 0;
+}
+
+static int adsp_loader_probe(struct platform_device *pdev)
+{
+	int ret = adsp_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 adsp_loader_dt_match[] = {
+	{ .compatible = "qcom,adsp-loader" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, adsp_loader_dt_match);
+
+static struct platform_driver adsp_loader_driver = {
+	.driver = {
+		.name = "adsp-loader",
+		.owner = THIS_MODULE,
+		.of_match_table = adsp_loader_dt_match,
+	},
+	.probe = adsp_loader_probe,
+	.remove = adsp_loader_remove,
+};
+
+static int __init adsp_loader_init(void)
+{
+	return platform_driver_register(&adsp_loader_driver);
+}
+module_init(adsp_loader_init);
+
+static void __exit adsp_loader_exit(void)
+{
+	platform_driver_unregister(&adsp_loader_driver);
+}
+module_exit(adsp_loader_exit);
+
+MODULE_DESCRIPTION("ADSP Loader module");
+MODULE_LICENSE("GPL v2");