slimbus: qcom-ngd-ctrl: add Protection Domain Restart Support

Add support to protection domain restart. Protection domain restart
would also restart the service just like SSR.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20201127102451.17114-4-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/slimbus/Kconfig

@@ -26,6 +26,7 @@ config SLIM_QCOM_NGD_CTRL
 	depends on ARCH_QCOM || COMPILE_TEST
 	select QCOM_QMI_HELPERS
 	select QCOM_RPROC_COMMON
+	select QCOM_PDR_HELPERS
 	help
 	  Select driver if Qualcomm's SLIMbus Satellite Non-Generic Device
 	  Component is programmed using Linux kernel.

drivers/slimbus/qcom-ngd-ctrl.c

@@ -19,6 +19,7 @@
 #include <linux/of.h>
 #include <linux/io.h>
 #include <linux/soc/qcom/qmi.h>
+#include <linux/soc/qcom/pdr.h>
 #include <net/sock.h>
 #include "slimbus.h"
 
@@ -166,6 +167,7 @@ struct qcom_slim_ngd_ctrl {
 	struct mutex ssr_lock;
 	struct notifier_block nb;
 	void *notifier;
+	struct pdr_handle *pdr;
 	enum qcom_slim_ngd_state state;
 	dma_addr_t rx_phys_base;
 	dma_addr_t tx_phys_base;
@@ -1382,6 +1384,7 @@ static int qcom_slim_ngd_ssr_pdr_notify(struct qcom_slim_ngd_ctrl *ctrl,
 {
 	switch (action) {
 	case QCOM_SSR_BEFORE_SHUTDOWN:
+	case SERVREG_SERVICE_STATE_DOWN:
 		/* Make sure the last dma xfer is finished */
 		mutex_lock(&ctrl->tx_lock);
 		if (ctrl->state != QCOM_SLIM_NGD_CTRL_DOWN) {
@@ -1393,6 +1396,7 @@ static int qcom_slim_ngd_ssr_pdr_notify(struct qcom_slim_ngd_ctrl *ctrl,
 		mutex_unlock(&ctrl->tx_lock);
 		break;
 	case QCOM_SSR_AFTER_POWERUP:
+	case SERVREG_SERVICE_STATE_UP:
 		schedule_work(&ctrl->ngd_up_work);
 		break;
 	default:
@@ -1412,6 +1416,12 @@ static int qcom_slim_ngd_ssr_notify(struct notifier_block *nb,
 	return qcom_slim_ngd_ssr_pdr_notify(ctrl, action);
 }
 
+static void slim_pd_status(int state, char *svc_path, void *priv)
+{
+	struct qcom_slim_ngd_ctrl *ctrl = (struct qcom_slim_ngd_ctrl *)priv;
+
+	qcom_slim_ngd_ssr_pdr_notify(ctrl, state);
+}
 static int of_qcom_slim_ngd_register(struct device *parent,
 				     struct qcom_slim_ngd_ctrl *ctrl)
 {
@@ -1499,6 +1509,7 @@ static int qcom_slim_ngd_ctrl_probe(struct platform_device *pdev)
 	struct qcom_slim_ngd_ctrl *ctrl;
 	struct resource *res;
 	int ret;
+	struct pdr_service *pds;
 
 	ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
 	if (!ctrl)
@@ -1549,6 +1560,18 @@ static int qcom_slim_ngd_ctrl_probe(struct platform_device *pdev)
 	init_completion(&ctrl->qmi.qmi_comp);
 	init_completion(&ctrl->qmi_up);
 
+	ctrl->pdr = pdr_handle_alloc(slim_pd_status, ctrl);
+	if (IS_ERR(ctrl->pdr)) {
+		dev_err(dev, "Failed to init PDR handle\n");
+		return PTR_ERR(ctrl->pdr);
+	}
+
+	pds = pdr_add_lookup(ctrl->pdr, "avs/audio", "msm/adsp/audio_pd");
+	if (IS_ERR(pds) && PTR_ERR(pds) != -EALREADY) {
+		dev_err(dev, "pdr add lookup failed: %d\n", ret);
+		return PTR_ERR(pds);
+	}
+
 	platform_driver_register(&qcom_slim_ngd_driver);
 	return of_qcom_slim_ngd_register(dev, ctrl);
 }
@@ -1565,6 +1588,7 @@ static int qcom_slim_ngd_remove(struct platform_device *pdev)
 	struct qcom_slim_ngd_ctrl *ctrl = platform_get_drvdata(pdev);
 
 	pm_runtime_disable(&pdev->dev);
+	pdr_handle_release(ctrl->pdr);
 	qcom_unregister_ssr_notifier(ctrl->notifier, &ctrl->nb);
 	qcom_slim_ngd_enable(ctrl, false);
 	qcom_slim_ngd_exit_dma(ctrl);