soc/intel/cannonlake: Add TDC config for CML

Add Thermal Design Current (TDC) defaults for CML:
1. TdcEnable
2. TdcPowerLimit

BUG=b:148912093
BRANCH=None
TEST=build coreboot and Intel FSP with fw_debug enabled, flash image to
     the device, capture the log from the serial port during boot-up and
     check TdcEnable and TdcPowerLimit for each domain in captured log

Signed-off-by: Marx Wang <marx.wang@intel.com>
Change-Id: Ie4b17e5b4ce41c1adb436ae5646f0d8578a440e8
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38741
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: EricR Lai <ericr_lai@compal.corp-partner.google.com>
Reviewed-by: John Su <john_su@compal.corp-partner.google.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

2 files changed, 113 insertions, 0 deletions

diff --git a/src/soc/intel/cannonlake/include/soc/vr_config.h b/src/soc/intel/cannonlake/include/soc/vr_config.h
index 1390b174e1..456db5b48f 100644
--- a/src/soc/intel/cannonlake/include/soc/vr_config.h
+++ b/src/soc/intel/cannonlake/include/soc/vr_config.h
@@ -53,10 +53,18 @@ struct vr_config {
 	/* AC and DC Loadline in 1/100 mOhms. Range is 0-6249 */
 	uint16_t ac_loadline;
 	uint16_t dc_loadline;
+
+	/* Thermal Design Current (TDC) Power Limit will take effect when
+	   this is set to 0 */
+	uint8_t tdc_disable;
+
+	/* Thermal Design Current (TDC) Power Limit in 1/8 A units */
+	uint16_t tdc_powerlimit;
 };
 
 #define VR_CFG_AMP(i) (uint16_t)((i) * 4)
 #define VR_CFG_MOHMS(i) (uint16_t)((i) * 100)
+#define VR_CFG_TDC_AMP(i) (uint16_t)((i) * 8)
 
 /* VrConfig Settings for 4 domains
  * 0 = System Agent, 1 = IA Core,
@@ -85,6 +93,14 @@ enum vr_domain {
 		[VR_GT_SLICED]    = VR_CFG_MOHMS(gt_sl),	\
 	}
 
+#define VR_CFG_ALL_DOMAINS_TDC(sa, ia, gt_unsl, gt_sl)		\
+	{							\
+		[VR_SYSTEM_AGENT] = VR_CFG_TDC_AMP(sa),		\
+		[VR_IA_CORE]      = VR_CFG_TDC_AMP(ia),		\
+		[VR_GT_UNSLICED]  = VR_CFG_TDC_AMP(gt_unsl),	\
+		[VR_GT_SLICED]    = VR_CFG_TDC_AMP(gt_sl),	\
+	}
+
 void fill_vr_domain_config(void *params,
 		int domain, const struct vr_config *cfg);
 
diff --git a/src/soc/intel/cannonlake/vr_config.c b/src/soc/intel/cannonlake/vr_config.c
index 5fadcf4023..bd73d15dd7 100644
--- a/src/soc/intel/cannonlake/vr_config.c
+++ b/src/soc/intel/cannonlake/vr_config.c
@@ -419,6 +419,96 @@ static uint16_t get_sku_voltagelimit(int domain)
 	return 1520;
 }
 
+static uint16_t get_sku_tdc_powerlimit(int domain)
+{
+	const uint16_t tdp = cpu_get_power_max();
+	const config_t *cfg = config_of_soc();
+
+	static uint16_t mch_id = 0;
+	if (!mch_id) {
+		struct device *dev = pcidev_path_on_root(SA_DEVFN_ROOT);
+		mch_id = dev ? pci_read_config16(dev, PCI_DEVICE_ID) : 0xffff;
+	}
+
+	switch (mch_id) {
+	case PCI_DEVICE_ID_INTEL_CML_ULT:
+	case PCI_DEVICE_ID_INTEL_CML_ULT_6_2: {
+		uint16_t tdc[NUM_VR_DOMAINS] =
+				VR_CFG_ALL_DOMAINS_TDC(4, 58, 22, 22);
+
+		if (cfg->cpu_pl2_4_cfg == baseline)
+			tdc[VR_IA_CORE] = VR_CFG_TDC_AMP(48);
+
+		return tdc[domain];
+	}
+	case PCI_DEVICE_ID_INTEL_CML_ULT_2_2: {
+		const uint16_t tdc[NUM_VR_DOMAINS] =
+				VR_CFG_ALL_DOMAINS_TDC(4, 24, 22, 22);
+		return tdc[domain];
+	}
+	case PCI_DEVICE_ID_INTEL_CML_H_4_2: {
+		uint16_t tdc[NUM_VR_DOMAINS] =
+				VR_CFG_ALL_DOMAINS_TDC(10, 80, 25, 25);
+
+		if (cfg->cpu_pl2_4_cfg == baseline)
+			tdc[VR_IA_CORE] = VR_CFG_TDC_AMP(60);
+
+		return tdc[domain];
+	}
+	case PCI_DEVICE_ID_INTEL_CML_H: {
+		uint16_t tdc[NUM_VR_DOMAINS] =
+				VR_CFG_ALL_DOMAINS_TDC(10, 92, 25, 25);
+
+		if (cfg->cpu_pl2_4_cfg == baseline)
+			tdc[VR_IA_CORE] = VR_CFG_TDC_AMP(80);
+
+		return tdc[domain];
+	}
+	case PCI_DEVICE_ID_INTEL_CML_H_8_2: {
+		uint16_t tdc[NUM_VR_DOMAINS] =
+				VR_CFG_ALL_DOMAINS_TDC(10, 125, 25, 25);
+
+		if (tdp >= 65) /* 65W */
+			tdc[VR_IA_CORE] = (cfg->cpu_pl2_4_cfg == baseline) ?
+					  VR_CFG_TDC_AMP(117) :
+					  VR_CFG_TDC_AMP(146);
+		else /* 45W */
+			tdc[VR_IA_CORE] = (cfg->cpu_pl2_4_cfg == baseline) ?
+					  VR_CFG_TDC_AMP(86) :
+					  VR_CFG_TDC_AMP(125);
+
+		return tdc[domain];
+	}
+	case PCI_DEVICE_ID_INTEL_CML_S_G0G1_P0P1_6_2: {
+		uint16_t tdc[NUM_VR_DOMAINS] =
+				VR_CFG_ALL_DOMAINS_TDC(10, 74, 28, 28);
+
+		if (tdp >= 125) /* 125W */
+			tdc[VR_IA_CORE] = VR_CFG_TDC_AMP(132);
+		else if (tdp >= 65) /* 80W or 65W */
+			tdc[VR_IA_CORE] = VR_CFG_TDC_AMP(104);
+		else /* 35W */
+			tdc[VR_IA_CORE] = VR_CFG_TDC_AMP(74);
+
+		return tdc[domain];
+	}
+	case PCI_DEVICE_ID_INTEL_CML_S_P0P1_8_2:
+	case PCI_DEVICE_ID_INTEL_CML_S_P0P1_10_2: {
+		uint16_t tdc[NUM_VR_DOMAINS] =
+				VR_CFG_ALL_DOMAINS_TDC(10, 100, 28, 28);
+
+		if (tdp > 35) /* 125W or 80W or 65W */
+			tdc[VR_IA_CORE] = VR_CFG_TDC_AMP(175);
+
+		return tdc[domain];
+	}
+	default:
+		printk(BIOS_ERR, "ERROR: Unknown MCH (0x%x) in VR-config\n", mch_id);
+	}
+
+	return 0;
+}
+
 void fill_vr_domain_config(void *params,
 		int domain, const struct vr_config *chip_cfg)
 {
@@ -463,4 +553,11 @@ void fill_vr_domain_config(void *params,
 		vr_params->DcLoadline[domain] = cfg->dc_loadline;
 	else
 		vr_params->DcLoadline[domain] = get_sku_ac_dc_loadline(domain);
+
+	vr_params->TdcEnable[domain] = !cfg->tdc_disable;
+
+	if (cfg->tdc_powerlimit)
+		vr_params->TdcPowerLimit[domain] = cfg->tdc_powerlimit;
+	else
+		vr_params->TdcPowerLimit[domain] = get_sku_tdc_powerlimit(domain);
 }