soc/intel/denverton_ns: Add `pmc_mmio_regs` as public function

This patch adds `pmc_mmio_regs` a public function for other IA common
code may need to get access to this function.

BUG=none
TEST=none

Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: I67a0f7fdcd0827172426bc938569a5022eff16f2
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62166
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Mariusz Szafrański <mariuszx.szafranski@intel.com>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>

src/soc/intel/denverton_ns/include/soc/pm.h

@@ -28,6 +28,9 @@ struct chipset_power_state {
 	uint32_t prev_sleep_state;
 } __attribute__((packed));
 
+/* Get base address PMC memory mapped registers. */
+uint8_t *pmc_mmio_regs(void);
+
 struct chipset_power_state *fill_power_state(void);
 
 /* Power Management Utility Functions. */

src/soc/intel/denverton_ns/pmutil.c

@@ -84,6 +84,18 @@ void enable_smi(uint32_t mask)
 	outl(smi_en, (uint16_t)(pmbase + SMI_EN));
 }
 
+uint8_t *pmc_mmio_regs(void)
+{
+	uint32_t reg32;
+
+	reg32 = pci_read_config32(PCH_DEV_PMC, PMC_PWRM_BASE);
+
+	/* 4KiB alignment. */
+	reg32 &= ~0xfff;
+
+	return (void *)(uintptr_t) reg32;
+}
+
 void disable_smi(uint32_t mask)
 {
 	uint16_t pmbase = get_pmbase();