soc/intel/xeon_sp/cpx: Set PCU locks

Set the PCU locks as indicated by the BWG.

Lock the following:
 P_STATE_LIMITS
 PACKAGE_RAPL_LIMIT
 SAPMCTL
 DRAM_PLANE_POWER_LIMIT
 CONFIG_TDP_CONTROL

Change-Id: I5f44d83e2dd8411358a83b5641ddb4c370eb4e84
Signed-off-by: Marc Jones <marcjones@sysproconsulting.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51505
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Jay Talbott <JayTalbott@sysproconsulting.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

2 files changed, 58 insertions, 1 deletions

diff --git a/src/soc/intel/xeon_sp/cpx/chip.c b/src/soc/intel/xeon_sp/cpx/chip.c
index 0c71f221f2..a223542a32 100644
--- a/src/soc/intel/xeon_sp/cpx/chip.c
+++ b/src/soc/intel/xeon_sp/cpx/chip.c
@@ -111,6 +111,32 @@ static void iio_enable_masks(void)
 	}
 	iio_dmi_en_masks();
 }
+
+static void set_pcu_locks(void)
+{
+	for (uint32_t socket = 0; socket < soc_get_num_cpus(); ++socket) {
+		uint32_t bus = get_socket_stack_busno(socket, PCU_IIO_STACK);
+
+		/* configure PCU_CR0_FUN csrs */
+		const struct device *cr0_dev = PCU_DEV_CR0(bus);
+		pci_or_config32(cr0_dev, PCU_CR0_P_STATE_LIMITS, P_STATE_LIMITS_LOCK);
+		pci_or_config32(cr0_dev, PCU_CR0_PACKAGE_RAPL_LIMIT_UPR, PKG_PWR_LIM_LOCK_UPR);
+
+		/* configure PCU_CR1_FUN csrs */
+		const struct device *cr1_dev = PCU_DEV_CR1(bus);
+		pci_or_config32(cr1_dev, PCU_CR1_SAPMCTL, SAPMCTL_LOCK_MASK);
+
+		/* configure PCU_CR2_FUN csrs */
+		const struct device *cr2_dev = PCU_DEV_CR2(bus);
+		pci_or_config32(cr2_dev, PCU_CR2_DRAM_PLANE_POWER_LIMIT, PP_PWR_LIM_LOCK);
+
+		/* configure PCU_CR3_FUN csrs */
+		const struct device *cr3_dev = PCU_DEV_CR3(bus);
+		pci_or_config32(cr3_dev, PCU_CR3_CONFIG_TDP_CONTROL, TDP_LOCK);
+	}
+
+}
+
 static void chip_final(void *data)
 {
 	/* Lock SBI */
@@ -127,6 +153,8 @@ static void chip_final(void *data)
 	uint8_t reg8 = pci_io_read_config8(PCI_DEV(0, 0, 0), 0x88);
 	pci_io_write_config8(PCI_DEV(0, 0, 0), 0x88, reg8 | (1 << 4));
 
+	set_pcu_locks();
+
 	p2sb_hide();
 	iio_enable_masks();
 	set_bios_init_completion();
diff --git a/src/soc/intel/xeon_sp/cpx/include/soc/pci_devs.h b/src/soc/intel/xeon_sp/cpx/include/soc/pci_devs.h
index 46c034c296..54b76b5719 100644
--- a/src/soc/intel/xeon_sp/cpx/include/soc/pci_devs.h
+++ b/src/soc/intel/xeon_sp/cpx/include/soc/pci_devs.h
@@ -23,10 +23,26 @@
 #define SAD_ALL_PAM0123_CSR		0x40
 #define SAD_ALL_PAM456_CSR		0x44
 
+#if !defined(__SIMPLE_DEVICE__)
+#define _PCU_DEV(bus, func)		pcidev_path_on_bus(bus, PCI_DEVFN(PCU_DEV, func))
+#else
+#define _PCU_DEV(bus, func)		PCI_DEV(bus, PCU_DEV, func)
+#endif
+
 #define PCU_IIO_STACK                   1
 #define PCU_DEV                         30
-#define PCU_CR1_FUN                     1
 
+#define PCU_CR0_FUN                     0
+#define PCU_DEV_CR0(bus)                                   _PCU_DEV(bus, PCU_CR0_FUN)
+#define PCU_CR0_PLATFORM_INFO                              0xa8
+#define PCU_CR0_P_STATE_LIMITS                             0xd8
+#define P_STATE_LIMITS_LOCK                                BIT(31)
+#define PCU_CR0_PACKAGE_RAPL_LIMIT_LWR                     0xe8
+#define PCU_CR0_PACKAGE_RAPL_LIMIT_UPR                     (PCU_CR0_PACKAGE_RAPL_LIMIT_LWR + 4)
+#define PKG_PWR_LIM_LOCK_UPR                               BIT(31)
+
+#define PCU_CR1_FUN                     1
+#define PCU_DEV_CR1(bus)                                   _PCU_DEV(bus, PCU_CR1_FUN)
 #define PCU_CR1_BIOS_MB_DATA_REG                           0x8c
 
 #define PCU_CR1_BIOS_MB_INTERFACE_REG                      0x90
@@ -49,6 +65,19 @@
 #define PCU_CR1_DESIRED_CORES_CFG2_REG                     0xa0
 #define PCU_CR1_DESIRED_CORES_CFG2_REG_LOCK_MASK           BIT(31)
 
+#define PCU_CR1_SAPMCTL                                    0xb0
+#define SAPMCTL_LOCK_MASK                                   BIT(31)
+
+#define PCU_CR2_FUN                     2
+#define PCU_DEV_CR2(bus)                                   _PCU_DEV(bus, PCU_CR2_FUN)
+#define PCU_CR2_DRAM_PLANE_POWER_LIMIT                     0xf0
+#define PP_PWR_LIM_LOCK                                    BIT(31)
+
+#define PCU_CR3_FUN                     3
+#define PCU_DEV_CR3(bus)                                   _PCU_DEV(bus, PCU_CR3_FUN)
+#define PCU_CR3_CONFIG_TDP_CONTROL                         0x60
+#define TDP_LOCK                                           BIT(31)
+
 #define UBOX_DECS_BUS			0
 #define UBOX_DECS_DEV			8
 #define UBOX_DECS_FUNC			2