SCOM restore for DARN and XIVE

While waking up from stop11, we want NCU_DARN_BAR to have enable bit set.
Without this stop_api call, the value restored is without enable bit set.
We loose NCU_SPEC_BAR when the quad goes into stop11, stop_api will
restore while waking up from stop11.

Signed-off-by: Akshay Adiga <akshay.adiga@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/hw/nx.c b/hw/nx.c
index f6e823f..0f6ff04 100644
--- a/hw/nx.c
+++ b/hw/nx.c
@@ -24,6 +24,7 @@
 #include <chip.h>
 #include <xscom-p9-regs.h>
 #include <phys-map.h>
+#include <p9_stop_api.H>
 
 static void p9_darn_init(void)
 {
@@ -61,6 +62,47 @@ static void p9_darn_init(void)
 						P9X_EX_NCU_DARN_BAR);
 			xscom_write(chip->id, addr,
 				    bar | P9X_EX_NCU_DARN_BAR_EN);
+
+		}
+	}
+}
+
+void nx_p9_rng_late_init(void)
+{
+	struct cpu_thread *c;
+	uint64_t rc;
+
+	if (proc_gen != proc_gen_p9)
+		return;
+	if (chip_quirk(QUIRK_NO_RNG))
+		return;
+
+	prlog(PR_NOTICE, "SLW: Configuring self-restore for P9X_EX_NCU_DARN_BAR\n");
+	for_each_present_cpu(c) {
+		if(cpu_is_thread0(c)) {
+			struct proc_chip *chip = get_chip(c->chip_id);
+			uint64_t addr, bar;
+
+			phys_map_get(chip->id, NX_RNG, 0, &bar, NULL);
+			addr = XSCOM_ADDR_P9_EX(pir_to_core_id(c->pir),
+					P9X_EX_NCU_DARN_BAR);
+			/* Bail out if wakeup engine has already failed */
+			if ( wakeup_engine_state != WAKEUP_ENGINE_PRESENT) {
+				prlog(PR_ERR,"DARN BAR p9_stop_api fail detected\n");
+				break;
+			}
+			rc = p9_stop_save_scom((void *)chip->homer_base,
+					addr, bar | P9X_EX_NCU_DARN_BAR_EN,
+					P9_STOP_SCOM_REPLACE,
+					P9_STOP_SECTION_EQ_SCOM);
+			if (rc) {
+				prlog(PR_ERR,
+				"p9_stop_api for DARN_BAR failed rc= %lld",
+				rc);
+				prlog(PR_ERR, "Disabling deep stop states\n");
+				wakeup_engine_state = WAKEUP_ENGINE_FAILED;
+				break;
+			}
 		}
 	}
 }