km: qrio: add access functions for ebootcount
The EBOOTCNT is a reserved persistent static memory area in QRIO,
and similar to BOOTCNT is intended to be used as boot counter location.
Comparable to BOOTCNT that is reserved for u-boot main bootcount
infrastructure, EBOOTCNT is intended to be used for pg-wcom board
specific purposes (e.g implementing early boot counter for fail-safe
u-boot update).
Signed-off-by: Aleksandar Gerasimovski <aleksandar.gerasimovski@hitachienergy.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/board/keymile/common/qrio.c b/board/keymile/common/qrio.c
index 89a9726..5401bdd 100644
--- a/board/keymile/common/qrio.c
+++ b/board/keymile/common/qrio.c
@@ -270,6 +270,44 @@
out_8(qrio_base + RSTCFG_OFF, rstcfg);
}
+/* Early bootcount memory area is avilable starting from QRIO3 Rev.2 */
+#define QRIO3_ID 0x71
+#define QRIO3_REV 0x02
+#define EBOOTCNT_OFF 0x28
+
+ulong early_bootcount_load(void)
+{
+ void __iomem *qrio_base = (void *)CONFIG_SYS_QRIO_BASE;
+ u16 id_rev = in_be16(qrio_base + ID_REV_OFF);
+ u8 id = (id_rev >> 8) & 0xff;
+ u8 rev = id_rev & 0xff;
+ u32 ebootcount = 0;
+
+ if (id == QRIO3_ID && rev >= QRIO3_REV) {
+ ebootcount = in_be32(qrio_base + EBOOTCNT_OFF);
+ } else {
+ printf("QRIO: warning: early bootcount not supported, ");
+ printf("id = %u, rev = %u\n", id, rev);
+ }
+
+ return ebootcount;
+}
+
+void early_bootcount_store(ulong ebootcount)
+{
+ void __iomem *qrio_base = (void *)CONFIG_SYS_QRIO_BASE;
+ u16 id_rev = in_be16(qrio_base + ID_REV_OFF);
+ u8 id = (id_rev >> 8) & 0xff;
+ u8 rev = id_rev & 0xff;
+
+ if (id == QRIO3_ID && rev >= QRIO3_REV) {
+ out_be32(qrio_base + EBOOTCNT_OFF, ebootcount);
+ } else {
+ printf("QRIO: warning: early bootcount not supported, ");
+ printf("id = %u, rev = %u\n", id, rev);
+ }
+}
+
/* I2C deblocking uses the algorithm defined in board/keymile/common/common.c
* 2 dedicated QRIO GPIOs externally pull the SCL and SDA lines
* For I2C only the low state is activly driven and high state is pulled-up