[PATCH 7/9] remoteproc: imx_rproc: support kicking Mcore from Linux for i.MX8QXP

[Peng Fan (OSS)]

From: Peng Fan <peng.fan at nxp.com>

When M4 is in the same hardware partition with Cortex-A, it
could be start/stop by Linux.

Added power domain to make sure M4 could run, it requires several power
domains to work. Make clk always optional for i.MX8QXP, because
SCFW handles it when power up M4 core.

Signed-off-by: Peng Fan <peng.fan at nxp.com>
---
 drivers/remoteproc/imx_rproc.c | 64 +++++++++++++++++++++++++++++++++-
 1 file changed, 63 insertions(+), 1 deletion(-)

diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
index 5f04aea2f6a1..09d2a06e5ed6 100644
--- a/drivers/remoteproc/imx_rproc.c
+++ b/drivers/remoteproc/imx_rproc.c
@@ -16,6 +16,7 @@
 #include <linux/of_reserved_mem.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
+#include <linux/pm_domain.h>
 #include <linux/regmap.h>
 #include <linux/remoteproc.h>
 #include <linux/workqueue.h>
@@ -97,6 +98,9 @@ struct imx_rproc {
 	struct notifier_block		proc_nb;
 	u32				rproc_pt;
 	u32				rsrc;
+	int                             num_pd;
+	struct device                   **pd_dev;
+	struct device_link              **pd_dev_link;
 };
 
 static const struct imx_rproc_att imx_rproc_att_imx8qxp[] = {
@@ -305,6 +309,9 @@ static int imx_rproc_start(struct rproc *rproc)
 		arm_smccc_smc(IMX_SIP_RPROC, IMX_SIP_RPROC_START, 0, 0, 0, 0, 0, 0, &res);
 		ret = res.a0;
 		break;
+	case IMX_RPROC_SCU_API:
+		ret = imx_sc_pm_cpu_start(priv->ipc_handle, priv->rsrc, true, 0x34fe0000);
+		break;
 	default:
 		return -EOPNOTSUPP;
 	}
@@ -334,6 +341,9 @@ static int imx_rproc_stop(struct rproc *rproc)
 		if (res.a1)
 			dev_info(dev, "Not in wfi, force stopped\n");
 		break;
+	case IMX_RPROC_SCU_API:
+		ret = imx_sc_pm_cpu_start(priv->ipc_handle, priv->rsrc, false, 0x34fe0000);
+		break;
 	default:
 		return -EOPNOTSUPP;
 	}
@@ -719,6 +729,56 @@ static int imx_rproc_partition_notify(struct notifier_block *nb,
 	return 0;
 }
 
+static int imx_rproc_attach_pd(struct imx_rproc *priv)
+{
+	struct device *dev = priv->dev;
+	int ret, i;
+
+	priv->num_pd = of_count_phandle_with_args(dev->of_node, "power-domains",
+						  "#power-domain-cells");
+	if (priv->num_pd < 0)
+		return priv->num_pd;
+
+	if (!priv->num_pd)
+		return 0;
+
+	priv->pd_dev = devm_kmalloc_array(dev, priv->num_pd, sizeof(*priv->pd_dev), GFP_KERNEL);
+	if (!priv->pd_dev)
+		return -ENOMEM;
+
+	priv->pd_dev_link = devm_kmalloc_array(dev, priv->num_pd, sizeof(*priv->pd_dev_link),
+					       GFP_KERNEL);
+
+	if (!priv->pd_dev_link)
+		return -ENOMEM;
+
+	for (i = 0; i < priv->num_pd; i++) {
+		priv->pd_dev[i] = dev_pm_domain_attach_by_id(dev, i);
+		if (IS_ERR(priv->pd_dev[i])) {
+			ret = PTR_ERR(priv->pd_dev[i]);
+			goto detach_pd;
+		}
+
+		priv->pd_dev_link[i] = device_link_add(dev, priv->pd_dev[i], DL_FLAG_STATELESS |
+						       DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE);
+		if (!priv->pd_dev_link[i]) {
+			dev_pm_domain_detach(priv->pd_dev[i], false);
+			ret = -EINVAL;
+			goto detach_pd;
+		}
+	}
+
+	return 0;
+
+detach_pd:
+	while (--i >= 0) {
+		device_link_del(priv->pd_dev_link[i]);
+		dev_pm_domain_detach(priv->pd_dev[i], false);
+	}
+
+	return ret;
+}
+
 static int imx_rproc_detect_mode(struct imx_rproc *priv)
 {
 	struct regmap_config config = { .name = "imx-rproc" };
@@ -749,13 +809,13 @@ static int imx_rproc_detect_mode(struct imx_rproc *priv)
 			return ret;
 		}
 
+		priv->has_clk = false;
 		/*
 		 * If Mcore resource is not owned by Acore partition, It is kicked by ROM,
 		 * and Linux could only do IPC with Mcore and nothing else.
 		 */
 		if (!imx_sc_rm_is_resource_owned(priv->ipc_handle, priv->rsrc)) {
 
-			priv->has_clk = false;
 			priv->rproc->self_recovery = true;
 			priv->rproc->state = RPROC_DETACHED;
 
@@ -782,6 +842,8 @@ static int imx_rproc_detect_mode(struct imx_rproc *priv)
 				dev_warn(dev, "Enable irq failed.\n");
 				return ret;
 			}
+		} else {
+			return imx_rproc_attach_pd(priv);
 		}
 
 		return 0;
-- 
2.25.1