[Skiboot] [PATCH] xscom: Grab P9 DD1.0 revision level

[Benjamin Herrenschmidt]

To differentiate between 1.00, 1.01, 1.02 etc...

Signed-off-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
---
 hw/xscom.c     | 28 ++++++++++++++++++++++++++++
 include/chip.h |  1 +
 2 files changed, 29 insertions(+)

diff --git a/hw/xscom.c b/hw/xscom.c
index 9afa952..cca3d7d 100644
--- a/hw/xscom.c
+++ b/hw/xscom.c
@@ -599,6 +599,34 @@ static void xscom_init_chip_info(struct proc_chip *chip)
 	/* Get EC level from CFAM ID */
 	chip->ec_level = ((val >> 16) & 0xf) << 4;
 	chip->ec_level |= (val >> 8) & 0xf;
+
+	/*
+	 * On P9 DD1.0, grab the ECID bits to differenciate
+	 * DD1.01, 1.02 etc...
+	 */
+	if (proc_gen == proc_gen_p9 && chip->ec_level == 0x10) {
+		uint64_t ecid2 = 0;
+		uint8_t rev;
+		xscom_read(chip->id, 0x18002, &ecid2);
+		switch((ecid2 >> 45) & 7) {
+		case 0:
+			rev = 0;
+			break;
+		case 1:
+			rev = 1;
+			break;
+		case 3:
+			rev = 2;
+			break;
+		case 7:
+			rev = 3;
+			break;
+		default:
+			rev = 0;
+		}
+		printf("P9 DD1.0%d detected\n", rev);
+		chip->ec_rev = rev;
+	}
 }
 
 /*
diff --git a/include/chip.h b/include/chip.h
index 61b413c..588db9f 100644
--- a/include/chip.h
+++ b/include/chip.h
@@ -155,6 +155,7 @@ struct proc_chip {
 	/* These are only initialized after xcom_init */
 	enum proc_chip_type	type;
 	uint32_t		ec_level;	/* 0xMm (DD1.0 = 0x10) */
+	uint8_t                 ec_rev;		/* sub-revision */
 
 	/* Those two values are only populated on machines with an FSP
 	 * dbob_id = Drawer/Block/Octant/Blade (DBOBID)