zynqmp: pm: Add IOCTL to set boot health status

Since the MMIO read/write APIs are removed from Linux user space,
Linux cannot directly write to the Global General Storage Register 4
any more to set healthy boot status.

Create an IOCTL to allow Linux to set boot health status.
Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
Signed-off-by: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>
Acked-by: Will Wong <willw@xilinx.com>

plat/xilinx/zynqmp/pm_service/pm_api_ioctl.c

@@ -505,6 +505,20 @@ static enum pm_ret_status pm_ioctl_ulpi_reset(void)
 	return ret;
 }
 
+/**
+ * pm_ioctl_set_boot_health_status() - Ioctl for setting healthy boot status
+ *
+ * This function sets healthy bit value to indicate boot health status
+ * to firmware.
+ *
+ * @return      Returns status, either success or error+reason
+ */
+static enum pm_ret_status pm_ioctl_set_boot_health_status(unsigned int value)
+{
+	return pm_mmio_write(PM_BOOT_HEALTH_STATUS_REG,
+			     PM_BOOT_HEALTH_STATUS_MASK, value);
+}
+
 /**
  * pm_api_ioctl() -  PM IOCTL API for device control and configs
  * @node_id	Node ID of the device
@@ -577,6 +591,9 @@ enum pm_ret_status pm_api_ioctl(enum pm_node_id nid,
 	case IOCTL_ULPI_RESET:
 		ret = pm_ioctl_ulpi_reset();
 		break;
+	case IOCTL_SET_BOOT_HEALTH_STATUS:
+		ret = pm_ioctl_set_boot_health_status(arg1);
+		break;
 	default:
 		ret = PM_RET_ERROR_NOTSUPPORTED;
 		break;

plat/xilinx/zynqmp/pm_service/pm_api_ioctl.h

@@ -34,6 +34,8 @@ enum {
 	IOCTL_READ_PGGS,
 	/* IOCTL for ULPI reset */
 	IOCTL_ULPI_RESET,
+	/* Set healthy bit value */
+	IOCTL_SET_BOOT_HEALTH_STATUS,
 };
 
 //RPU operation mode

plat/xilinx/zynqmp/zynqmp_def.h

@@ -335,4 +335,8 @@
 #define PGGS_BASEADDR		(0xFFD80050U)
 #define PGGS_NUM_REGS		U(4)
 
+/* Warm restart boot health status register and mask */
+#define PM_BOOT_HEALTH_STATUS_REG		(GGS_BASEADDR + U(0x10))
+#define PM_BOOT_HEALTH_STATUS_MASK		U(0x01)
+
 #endif /* __ZYNQMP_DEF_H__ */