soc/intel: Move `pmc_clear_pmcon_sts()` into IA common code

This patch moves `pmc_clear_pmcon_sts` function into common code and
remove SoC specific instances.

Accessing PMC GEN_PMCON_A register differs between different Intel
chipsets. Typically, there are two possible ways to perform GEN_PMCON_A
register programming (like `pmc_clear_pmcon_sts()`) as:
1. Using PCI configuration space when GEN_PMCON_A is a PCI configuration
   register.
2. Using MMIO access when GEN_PMCON_A is a memory mapped register.

SoC users to select `SOC_INTEL_MEM_MAPPED_PM_CONFIGURATION` Kconfig to
perform GEN_PMCON_A register programming using PMC MMIO.

BUG=b:211954778
TEST=Able to build brya.

Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: I8d15f421c128630f928a1b6a7e2840056d68d7b1
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62064
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jeff Daly <jeffd@silicom-usa.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>

1 files changed, 0 insertions, 15 deletions

diff --git a/src/soc/intel/skylake/pmutil.c b/src/soc/intel/skylake/pmutil.c
index ded44dc85c..fe26ebfe37 100644
--- a/src/soc/intel/skylake/pmutil.c
+++ b/src/soc/intel/skylake/pmutil.c
@@ -265,18 +265,3 @@ void pmc_soc_set_afterg3_en(const bool on)
 		reg8 |= SLEEP_AFTER_POWER_FAIL;
 	pci_write_config8(dev, GEN_PMCON_B, reg8);
 }
-
-void pmc_clear_pmcon_sts(void)
-{
-	uint32_t reg_val;
-	const pci_devfn_t dev = PCH_DEV_PMC;
-
-	reg_val = pci_read_config32(dev, GEN_PMCON_A);
-	/*
-	 * Clear SUS_PWR_FLR, GBL_RST_STS, HOST_RST_STS, PWR_FLR bits
-	 * while retaining MS4V write-1-to-clear bit
-	 */
-	reg_val &= ~(MS4V);
-
-	pci_write_config32(dev, GEN_PMCON_A, reg_val);
-}