Change in coreboot[master]: soc/intel/apollolake: Add function to clear PMCON status bits

[Subrata Banik (Code Review)]

Subrata Banik has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/61651 )

Change subject: soc/intel/apollolake: Add function to clear PMCON status bits
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soc/intel/apollolake: Add function to clear PMCON status bits

This patch adds function to `clear PMCON status bits` into SoC directory
to align with other IA coreboot implementation.

BUG=b:211954778
TEST=None.

Signed-off-by: Subrata Banik 
Change-Id: I982f669b13f25d1d0e6dfaec2fbf50d3200f74fe
---
M src/soc/intel/apollolake/include/soc/pm.h
M src/soc/intel/apollolake/pmutil.c
2 files changed, 17 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/51/61651/1

diff --git a/src/soc/intel/apollolake/include/soc/pm.h b/src/soc/intel/apollolake/include/soc/pm.h
index 01efaff..aec5e2c 100644
--- a/src/soc/intel/apollolake/include/soc/pm.h
+++ b/src/soc/intel/apollolake/include/soc/pm.h
@@ -241,4 +241,7 @@
 /* STM Support */
 uint16_t get_pmbase(void);

+/* Clear PMCON status bits */
+void pmc_clear_pmcon_sts(void);
+
 #endif
diff --git a/src/soc/intel/apollolake/pmutil.c b/src/soc/intel/apollolake/pmutil.c
index fbb2345..79ece4b 100644
--- a/src/soc/intel/apollolake/pmutil.c
+++ b/src/soc/intel/apollolake/pmutil.c
@@ -237,3 +237,17 @@
    	reg32 |= SLEEP_AFTER_POWER_FAIL;
    write32p(gen_pmcon1, reg32);
 }
+
+void pmc_clear_pmcon_sts(void)
+{
+	uint32_t reg_val;
+	uint8_t *addr;
+	addr = pmc_mmio_regs();
+
+	reg_val = read32(addr + GEN_PMCON1);
+	/* Clear SUS_PWR_FLR, GBL_RST_STS, HOST_RST_STS, PWR_FLR bits
+	 * while retaining MS4V write-1-to-clear bit */
+	reg_val &= ~(MS4V);
+
+	write32((addr + GEN_PMCON1), reg_val);
+}