soc/intel/common/timer: Move USE_LEGACY_8254_TIMER into common/block/timer

This patch moves USE_LEGACY_8254_TIMER Kconfig into common/block/timer
for better code sharing. Also ported CB:33512 for SPT and ICP PCH.

Change-Id: Ic767ff97aaa3eb7fa35ffa38fa416d006eaa6e78
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34132
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/soc/intel/cannonlake/Kconfig

@@ -316,14 +316,6 @@ config SOC_INTEL_CANNONLAKE_DEBUG_CONSENT
 	  Setting non-zero value will allow to use DBC or DCI to debug SOC.
 	  PlatformDebugConsent in FspmUpd.h has the details.
 
-config USE_LEGACY_8254_TIMER
-	bool "Use Legacy 8254 Timer"
-	default y if PAYLOAD_SEABIOS
-	default n
-	help
-	  This sets the Enable8254ClockGating UPD, which according to the FSP Integration
-	  guide needs to be disabled in order to boot SeaBIOS, but should otherwise be enabled.
-
 config PRERAM_CBMEM_CONSOLE_SIZE
 	hex
 	default 0xe00

src/soc/intel/common/block/timer/Kconfig

@@ -2,3 +2,13 @@ config SOC_INTEL_COMMON_BLOCK_TIMER
 	bool
 	help
 	  Intel Processor common TIMER support
+
+config USE_LEGACY_8254_TIMER
+	bool "Use Legacy 8254 Timer"
+	default y if PAYLOAD_SEABIOS || VGA_ROM_RUN
+	default n
+	help
+	  This sets the FSP UPD to enable Legacy 8254 clock gating. As per
+	  the FSP Integration guide Legacy 8254 timer clock gating UPD needs
+	  to be disabled in order to boot SeaBIOS or run OpRom,
+	  but should otherwise be enabled.

src/soc/intel/icelake/chip.h

@@ -204,8 +204,6 @@ struct soc_intel_icelake_config {
 	/* Enable/Disable EIST. 1b:Enabled, 0b:Disabled */
 	uint8_t eist_enable;
 
-	/* Statically clock gate 8254 PIT. */
-	uint8_t clock_gate_8254;
 	/* Enable C6 DRAM */
 	uint8_t enable_c6dram;
 	/*

src/soc/intel/icelake/espi.c

@@ -199,16 +199,6 @@ static void pch_misc_init(void)
 	outb((1 << 7), 0x70);
 };
 
-static void clock_gate_8254(const struct device *dev)
-{
-	const config_t *config = dev->chip_info;
-
-	if (!config->clock_gate_8254)
-		return;
-
-	itss_clock_gate_8254();
-}
-
 void lpc_soc_init(struct device *dev)
 {
 	/* Legacy initialization */
@@ -229,7 +219,6 @@ void lpc_soc_init(struct device *dev)
 	soc_pch_pirq_init(dev);
 	setup_i8259();
 	i8259_configure_irq_trigger(9, 1);
-	clock_gate_8254(dev);
 	soc_mirror_dmi_pcr_io_dec();
 }
 

src/soc/intel/icelake/fsp_params.c

@@ -124,6 +124,10 @@ void platform_fsp_silicon_init_params_cb(FSPS_UPD *supd)
 	/* disable Legacy PME */
 	memset(params->PcieRpPmSci, 0, sizeof(params->PcieRpPmSci));
 
+	/* Legacy 8254 timer support */
+	params->Enable8254ClockGating = !CONFIG_USE_LEGACY_8254_TIMER;
+	params->Enable8254ClockGatingOnS3 = 1;
+
 	/* S0ix */
 	params->PchPmSlpS0Enable = config->s0ix_enable;
 

src/soc/intel/skylake/chip.c

@@ -237,6 +237,9 @@ void soc_silicon_init_params(SILICON_INIT_UPD *params)
 	params->SlowSlewRateForSa = config->SlowSlewRateForSa;
 	params->FastPkgCRampDisable = config->FastPkgCRampDisable;
 
+	/* Legacy 8254 timer support */
+	params->Early8254ClockGatingEnable = !CONFIG_USE_LEGACY_8254_TIMER;
+
 	soc_irq_settings(params);
 }
 

src/soc/intel/skylake/chip.h

@@ -513,9 +513,6 @@ struct soc_intel_skylake_config {
 	/* Enable/Disable host reads to PMC XRAM registers */
 	u8 PchPmPmcReadDisable;
 
-	/* Statically clock gate 8254 PIT. */
-	u8 clock_gate_8254;
-
 	/*
 	 * Use SD card detect GPIO with default config:
 	 * - Edge triggered

src/soc/intel/skylake/chip_fsp20.c

@@ -315,6 +315,9 @@ void platform_fsp_silicon_init_params_cb(FSPS_UPD *supd)
 	/* disable Legacy PME */
 	memset(params->PcieRpPmSci, 0, sizeof(params->PcieRpPmSci));
 
+	/* Legacy 8254 timer support */
+	params->Early8254ClockGatingEnable = !CONFIG_USE_LEGACY_8254_TIMER;
+
 	memcpy(params->SerialIoDevMode, config->SerialIoDevMode,
 	       sizeof(params->SerialIoDevMode));
 

src/soc/intel/skylake/lpc.c

@@ -96,16 +96,6 @@ static const struct reg_script pch_misc_init_script[] = {
 	REG_SCRIPT_END
 };
 
-static void clock_gate_8254(struct device *dev)
-{
-	const config_t *config = dev->chip_info;
-
-	if (!config->clock_gate_8254)
-		return;
-
-	itss_clock_gate_8254();
-}
-
 void lpc_soc_init(struct device *dev)
 {
 	const config_t *const config = dev->chip_info;
@@ -125,5 +115,4 @@ void lpc_soc_init(struct device *dev)
 	soc_pch_pirq_init(dev);
 	setup_i8259();
 	i8259_configure_irq_trigger(9, 1);
-	clock_gate_8254(dev);
 }