diff options
Diffstat (limited to 'src/soc/intel/xeon_sp/cpx/chip.c')
| -rw-r--r-- | src/soc/intel/xeon_sp/cpx/chip.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/src/soc/intel/xeon_sp/cpx/chip.c b/src/soc/intel/xeon_sp/cpx/chip.c index 1fc9c7530b..b0e61b62ae 100644 --- a/src/soc/intel/xeon_sp/cpx/chip.c +++ b/src/soc/intel/xeon_sp/cpx/chip.c @@ -161,8 +161,32 @@ static void chip_final(void *data) set_bios_init_completion(); } +/* Only call this code from socket0! */ +static 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); +} + static void chip_init(void *data) { + unlock_pam_regions(); + printk(BIOS_DEBUG, "coreboot: calling fsp_silicon_init\n"); fsp_silicon_init(); |