soc/intel/xeon_sp: Share unlock_pam_regions()
unlock_pam_regions() is needed for SKX and CPX. Put the codes into
chip_gen1.c so that it could be shared among SoC generations.
After shared, unlock_pam_regions() is still called from SKX and
CPX SoC specific codes. SPR will also use chip_gen1.c, but it will
not call unlock_pam_regions().
TEST=Build and boot on intel/archercity CRB
Change-Id: Idbc7dc6dd22a1747a65543666fc714a0872e6b37
Signed-off-by: Shuo Liu <shuo.liu@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/81619
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
diff --git a/src/soc/intel/xeon_sp/chip_gen1.c b/src/soc/intel/xeon_sp/chip_gen1.c
index 80ffdda..99f5bd9 100644
--- a/src/soc/intel/xeon_sp/chip_gen1.c
+++ b/src/soc/intel/xeon_sp/chip_gen1.c
@@ -4,6 +4,9 @@
#include <assert.h>
#include <console/console.h>
#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <device/pci_def.h>
+#include <soc/pci_devs.h>
#include <intelblocks/acpi.h>
#include <post.h>
#include <soc/acpi.h>
@@ -199,3 +202,28 @@
else if (CONFIG(HAVE_IOAT_DOMAINS) && is_ioat_iio_stack_res(sr))
create_ioat_domains(dp, bus, sr, pci_segment_group);
}
+
+/*
+ * Route PAM segment access to DRAM
+ * Only call this code from socket0!
+ */
+void unlock_pam_regions(void)
+{
+ uint32_t pam0123_unlock_dram = 0x33333330;
+ uint32_t pam456_unlock_dram = 0x00333333;
+ /* Get UBOX(1) for socket0 */
+ uint32_t bus1 = socket0_get_ubox_busno(PCU_IIO_STACK);
+
+ /* Assume socket0 owns PCI segment 0 */
+ pci_io_write_config32(PCI_DEV(bus1, SAD_ALL_DEV, SAD_ALL_FUNC),
+ SAD_ALL_PAM0123_CSR, pam0123_unlock_dram);
+ pci_io_write_config32(PCI_DEV(bus1, SAD_ALL_DEV, SAD_ALL_FUNC),
+ SAD_ALL_PAM456_CSR, pam456_unlock_dram);
+
+ uint32_t reg1 = pci_io_read_config32(PCI_DEV(bus1, SAD_ALL_DEV,
+ SAD_ALL_FUNC), SAD_ALL_PAM0123_CSR);
+ uint32_t reg2 = pci_io_read_config32(PCI_DEV(bus1, SAD_ALL_DEV,
+ SAD_ALL_FUNC), SAD_ALL_PAM456_CSR);
+ printk(BIOS_DEBUG, "%s:%s pam0123_csr: 0x%x, pam456_csr: 0x%x\n",
+ __FILE__, __func__, reg1, reg2);
+}