nb/intel/pineview: Extract HPET setup and delay function

To allow other platforms to reuse this code, extract it into a separate
compilation unit. Since HPET is enabled through the southbridge, place
the code in the southbridge scope. Finally, select the newly-added
Kconfig option from i82801gx and replace lpc.c `enable_hpet` function.

Change-Id: I7a28cc4d12c6d79cd8ec45dfc8100f15e6eac303
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49365
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/northbridge/intel/pineview/raminit.c

@@ -8,6 +8,7 @@
 #include <console/console.h>
 #include <delay.h>
 #include <lib.h>
+#include <southbridge/intel/common/hpet.h>
 #include "pineview.h"
 #include "raminit.h"
 #include <spd.h>
@@ -529,20 +530,6 @@ static void sdram_detect_ram_speed(struct sysinfo *s)
 	}
 }
 
-#define HPET_BASE 0xfed00000
-#define HPET32(x) *((volatile u32 *)(HPET_BASE + x))
-static void enable_hpet(void)
-{
-	u32 reg32;
-	reg32 = RCBA32(HPTC);
-	reg32 &= ~0x03;
-	reg32 |= (1 << 7);
-	RCBA32(HPTC) = reg32;
-	/* On NM10 this only works if read back */
-	RCBA32(HPTC);
-	HPET32(0x10) = HPET32(0x10) | 1;
-}
-
 static void sdram_clk_crossing(struct sysinfo *s)
 {
 	u8 ddr_freq, fsb_freq;
@@ -1595,27 +1582,6 @@ static void sdram_mmap(struct sysinfo *s)
 	pci_write_config32(HOST_BRIDGE, 0xac, tsegmb[s->dimm_config[0]]);
 }
 
-static void hpet_udelay(u32 del)
-{
-	u32 start, finish, now;
-
-	del *= 15; /* now in usec */
-
-	start = HPET32(0xf0);
-	finish = start + del;
-	while (1) {
-		now = HPET32(0xf0);
-		if (finish > start) {
-			if (now >= finish)
-				break;
-		} else {
-			if ((now < start) && (now >= finish)) {
-				break;
-			}
-		}
-	}
-}
-
 static u8 sdram_checkrcompoverride(void)
 {
 	u32 xcomp;

src/southbridge/intel/common/Kconfig

@@ -15,6 +15,9 @@ config SOUTHBRIDGE_INTEL_COMMON_PMBASE
 config SOUTHBRIDGE_INTEL_COMMON_GPIO
 	def_bool n
 
+config SOUTHBRIDGE_INTEL_COMMON_HPET
+	def_bool n
+
 config SOUTHBRIDGE_INTEL_COMMON_EARLY_SMBUS
 	def_bool n
 

src/southbridge/intel/common/Makefile.inc

@@ -5,6 +5,8 @@ subdirs-y += firmware
 
 all-$(CONFIG_SOUTHBRIDGE_INTEL_COMMON_RESET) += reset.c
 
+all-$(CONFIG_SOUTHBRIDGE_INTEL_COMMON_HPET) += hpet.c
+
 romstage-$(CONFIG_SOUTHBRIDGE_INTEL_COMMON_EARLY_SMBUS) += early_smbus.c
 
 romstage-$(CONFIG_SOUTHBRIDGE_INTEL_COMMON_SMBUS) += smbus.c

src/southbridge/intel/common/hpet.c

@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <southbridge/intel/common/rcba.h>
+#include <stdint.h>
+
+#include "hpet.h"
+
+#define HPTC		0x3404
+
+#define HPET_BASE 0xfed00000
+#define HPET32(x) (*((volatile u32 *)(HPET_BASE + (x))))
+
+void enable_hpet(void)
+{
+	u32 reg32;
+	reg32 = RCBA32(HPTC);
+	reg32 &= ~0x03;
+	reg32 |= (1 << 7);
+	RCBA32(HPTC) = reg32;
+	/* Read back for posted write to take effect */
+	RCBA32(HPTC);
+	HPET32(0x10) = HPET32(0x10) | 1;
+}
+
+void hpet_udelay(u32 delay)
+{
+	u32 start, finish, now;
+
+	delay *= 15; /* now in usec */
+
+	start = HPET32(0xf0);
+	finish = start + delay;
+	while (1) {
+		now = HPET32(0xf0);
+		if (finish > start) {
+			if (now >= finish)
+				break;
+		} else {
+			if ((now < start) && (now >= finish))
+				break;
+		}
+	}
+}

src/southbridge/intel/common/hpet.h

@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef SOUTHBRIDGE_INTEL_COMMON_HPET_H
+#define SOUTHBRIDGE_INTEL_COMMON_HPET_H
+
+#include <stdint.h>
+
+void enable_hpet(void);
+void hpet_udelay(u32 delay);
+
+#endif /* SOUTHBRIDGE_INTEL_COMMON_HPET_H */

src/southbridge/intel/i82801gx/Kconfig

@@ -21,6 +21,7 @@ config SOUTHBRIDGE_INTEL_I82801GX
 	select SOUTHBRIDGE_INTEL_COMMON_RTC
 	select SOUTHBRIDGE_INTEL_COMMON_RESET
 	select SOUTHBRIDGE_INTEL_COMMON_USB_DEBUG
+	select SOUTHBRIDGE_INTEL_COMMON_HPET
 
 if SOUTHBRIDGE_INTEL_I82801GX
 

src/southbridge/intel/i82801gx/lpc.c

@@ -18,6 +18,7 @@
 #include <arch/smp/mpspec.h>
 #include <string.h>
 #include <southbridge/intel/common/acpi_pirq_gen.h>
+#include <southbridge/intel/common/hpet.h>
 #include <southbridge/intel/common/pmbase.h>
 #include <southbridge/intel/common/spi.h>
 
@@ -268,21 +269,6 @@ static void i82801gx_rtc_init(struct device *dev)
 	cmos_init(rtc_failed);
 }
 
-static void enable_hpet(void)
-{
-	u32 reg32;
-
-	/* Move HPET to default address 0xfed00000 and enable it */
-	reg32 = RCBA32(HPTC);
-	reg32 |= (1 << 7); // HPET Address Enable
-	reg32 &= ~(3 << 0);
-	RCBA32(HPTC) = reg32;
-	/* On NM10 this only works if read back */
-	RCBA32(HPTC);
-
-	write32((u32 *)0xfed00010, read32((u32 *)0xfed00010) | 1);
-}
-
 static void enable_clock_gating(void)
 {
 	u32 reg32;