[coreboot-gerrit] Change in coreboot[master]: src/soc/intel/common/cse: Add helper functions to support CSE FW update

[Sridhar Siricilla (Code Review)]

Sridhar Siricilla has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/36786 )

Change subject: src/soc/intel/common/cse: Add helper functions to support CSE FW update
......................................................................

src/soc/intel/common/cse: Add helper functions to support CSE FW update

Below helper functions are added:
* cse_wait_opmode_soft_temp_disable() - It polls for CSE's operation mode
  'Soft Temporary Disable". The CSE enters this mode when it boots from
  RO_BP1 region.

* cse_check_opmode_soft_temp_disable() - It reads CSE's FWSTS1 register
  and checks for CSE's operation mode 'Soft Temporary Disable'.

Change-Id: Ibdcf01f31b0310932b8e834ae83144f8a67f1fef
Signed-off-by: Sridhar Siricilla 
---
M src/soc/intel/common/block/cse/cse.c
1 file changed, 29 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/86/36786/1

diff --git a/src/soc/intel/common/block/cse/cse.c b/src/soc/intel/common/block/cse/cse.c
index 247e60a..d7fd21b 100644
--- a/src/soc/intel/common/block/cse/cse.c
+++ b/src/soc/intel/common/block/cse/cse.c
@@ -294,6 +294,35 @@
    return 1;
 }

+static int cse_check_opmode_soft_temp_disable(void)
+{
+	union me_hfsts1 hfs1;
+
+	hfs1.data = me_read_config32(PCI_ME_HFSTS1);
+
+	if (hfs1.fields.operation_mode == ME_HFS_TEMP_DISABLE)
+		return 1;
+	else
+		return 0;
+}
+
+/*
+ * Polls for CSE's operation mode 'Soft Temporary Disable'.
+ * The CSE enters the operation mode when it boots from RO_BP1 region.
+ */
+uint8_t cse_wait_opmode_soft_temp_disable(void)
+{
+	struct stopwatch sw;
+	stopwatch_init_msecs_expire(&sw, HECI_DELAY_READY);
+	while (!check_cse_opmode_soft_disable_state()) {
+		udelay(HECI_DELAY);
+		if (stopwatch_expired(&sw))
+			return 0;
+	}
+
+	return 1;
+}
+
 static int wait_heci_ready(void)
 {
    struct stopwatch sw;