| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <amdblocks/data_fabric.h> |
| #include <arch/hpet.h> |
| #include <console/console.h> |
| #include <cpu/x86/lapic_def.h> |
| #include <soc/data_fabric.h> |
| #include <types.h> |
| |
| static void data_fabric_disable_mmio_reg(unsigned int reg) |
| { |
| union df_mmio_control ctrl = { .dst_fabric_id = IOMS0_FABRIC_ID }; |
| data_fabric_broadcast_write32(DF_MMIO_CONTROL(reg), ctrl.raw); |
| data_fabric_broadcast_write32(DF_MMIO_BASE(reg), 0); |
| data_fabric_broadcast_write32(DF_MMIO_LIMIT(reg), 0); |
| } |
| |
| static bool is_mmio_reg_disabled(unsigned int reg) |
| { |
| union df_mmio_control ctrl; |
| ctrl.raw = data_fabric_broadcast_read32(DF_MMIO_CONTROL(reg)); |
| return !(ctrl.we || ctrl.re); |
| } |
| |
| static int data_fabric_find_unused_mmio_reg(void) |
| { |
| for (unsigned int i = 0; i < DF_MMIO_REG_SET_COUNT; i++) { |
| if (is_mmio_reg_disabled(i)) |
| return i; |
| } |
| return -1; |
| } |
| |
| void data_fabric_set_mmio_np(void) |
| { |
| /* |
| * Mark region from HPET-LAPIC or 0xfed00000-0xfee00000-1 as NP. |
| * |
| * AGESA has already programmed the NB MMIO routing, however nothing |
| * is yet marked as non-posted. |
| * |
| * If there exists an overlapping routing base/limit pair, trim its |
| * base or limit to avoid the new NP region. If any pair exists |
| * completely within HPET-LAPIC range, remove it. If any pair surrounds |
| * HPET-LAPIC, it must be split into two regions. |
| * |
| * TODO(b/156296146): Remove the settings from AGESA and allow coreboot |
| * to own everything. If not practical, consider erasing all settings |
| * and have coreboot reprogram them. At that time, make the source |
| * below more flexible. |
| * * Note that the code relies on the granularity of the HPET and |
| * LAPIC addresses being sufficiently large that the shifted limits |
| * +/-1 are always equivalent to the non-shifted values +/-1. |
| */ |
| |
| unsigned int i; |
| int reg; |
| uint32_t base, limit; |
| union df_mmio_control ctrl; |
| const uint32_t np_bot = HPET_BASE_ADDRESS >> DF_MMIO_SHIFT; |
| const uint32_t np_top = (LAPIC_DEFAULT_BASE - 1) >> DF_MMIO_SHIFT; |
| |
| data_fabric_print_mmio_conf(); |
| |
| for (i = 0; i < DF_MMIO_REG_SET_COUNT; i++) { |
| /* Adjust all registers that overlap */ |
| ctrl.raw = data_fabric_broadcast_read32(DF_MMIO_CONTROL(i)); |
| if (!(ctrl.we || ctrl.re)) |
| continue; /* not enabled */ |
| |
| base = data_fabric_broadcast_read32(DF_MMIO_BASE(i)); |
| limit = data_fabric_broadcast_read32(DF_MMIO_LIMIT(i)); |
| |
| if (base > np_top || limit < np_bot) |
| continue; /* no overlap at all */ |
| |
| if (base >= np_bot && limit <= np_top) { |
| data_fabric_disable_mmio_reg(i); /* 100% within, so remove */ |
| continue; |
| } |
| |
| if (base < np_bot && limit > np_top) { |
| /* Split the configured region */ |
| data_fabric_broadcast_write32(DF_MMIO_LIMIT(i), np_bot - 1); |
| reg = data_fabric_find_unused_mmio_reg(); |
| if (reg < 0) { |
| /* Although a pair could be freed later, this condition is |
| * very unusual and deserves analysis. Flag an error and |
| * leave the topmost part unconfigured. */ |
| printk(BIOS_ERR, "Not enough NB MMIO routing registers\n"); |
| continue; |
| } |
| data_fabric_broadcast_write32(DF_MMIO_BASE(reg), np_top + 1); |
| data_fabric_broadcast_write32(DF_MMIO_LIMIT(reg), limit); |
| data_fabric_broadcast_write32(DF_MMIO_CONTROL(reg), ctrl.raw); |
| continue; |
| } |
| |
| /* If still here, adjust only the base or limit */ |
| if (base <= np_bot) |
| data_fabric_broadcast_write32(DF_MMIO_LIMIT(i), np_bot - 1); |
| else |
| data_fabric_broadcast_write32(DF_MMIO_BASE(i), np_top + 1); |
| } |
| |
| reg = data_fabric_find_unused_mmio_reg(); |
| if (reg < 0) { |
| printk(BIOS_ERR, "cannot configure region as NP\n"); |
| return; |
| } |
| |
| union df_mmio_control np_ctrl = { .dst_fabric_id = IOMS0_FABRIC_ID, |
| .np = 1, .we = 1, .re = 1 }; |
| data_fabric_broadcast_write32(DF_MMIO_BASE(reg), np_bot); |
| data_fabric_broadcast_write32(DF_MMIO_LIMIT(reg), np_top); |
| data_fabric_broadcast_write32(DF_MMIO_CONTROL(reg), np_ctrl.raw); |
| |
| data_fabric_print_mmio_conf(); |
| } |