| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <acpi/acpi_device.h> |
| #include <amdblocks/data_fabric.h> |
| #include <amdblocks/pci_devs.h> |
| #include <arch/hpet.h> |
| #include <console/console.h> |
| #include <cpu/x86/lapic_def.h> |
| #include <device/pci_ops.h> |
| #include <soc/data_fabric.h> |
| #include <soc/pci_devs.h> |
| #include <types.h> |
| |
| static void data_fabric_set_indirect_address(uint16_t fn_reg, uint8_t instance_id) |
| { |
| union df_ficaa ficaa = { .cfg_inst_acc_en = 1 }; /* target only specific instance */ |
| /* convert register address to 32-bit register number */ |
| ficaa.reg_num = DF_REG_OFFSET(fn_reg) >> 2; |
| ficaa.func_num = DF_REG_FN(fn_reg); |
| ficaa.inst_id = instance_id; |
| data_fabric_broadcast_write32(DF_FICAA_BIOS, ficaa.raw); |
| } |
| |
| uint32_t data_fabric_read32(uint16_t fn_reg, uint8_t instance_id) |
| { |
| /* Broadcast reads might return unexpected results when a register has different |
| contents in the different instances. */ |
| if (instance_id == BROADCAST_FABRIC_ID) |
| return data_fabric_broadcast_read32(fn_reg); |
| |
| /* non-broadcast data fabric accesses need to be done via indirect access */ |
| data_fabric_set_indirect_address(fn_reg, instance_id); |
| return data_fabric_broadcast_read32(DF_FICAD_LO); |
| } |
| |
| void data_fabric_write32(uint16_t fn_reg, uint8_t instance_id, uint32_t data) |
| { |
| if (instance_id == BROADCAST_FABRIC_ID) { |
| data_fabric_broadcast_write32(fn_reg, data); |
| return; |
| } |
| |
| /* non-broadcast data fabric accesses need to be done via indirect access */ |
| data_fabric_set_indirect_address(fn_reg, instance_id); |
| data_fabric_broadcast_write32(DF_FICAD_LO, data); |
| } |
| |
| void data_fabric_print_mmio_conf(void) |
| { |
| union df_mmio_control control; |
| uint64_t base, limit; |
| printk(BIOS_SPEW, |
| "=== Data Fabric MMIO configuration registers ===\n" |
| "idx base limit control R W NP F-ID\n"); |
| for (unsigned int i = 0; i < DF_MMIO_REG_SET_COUNT; i++) { |
| control.raw = data_fabric_broadcast_read32(DF_MMIO_CONTROL(i)); |
| /* Base and limit address registers don't contain the lower address bits, but |
| are shifted by D18F0_MMIO_SHIFT bits */ |
| base = (uint64_t)data_fabric_broadcast_read32(DF_MMIO_BASE(i)) |
| << DF_MMIO_SHIFT; |
| limit = (uint64_t)data_fabric_broadcast_read32(DF_MMIO_LIMIT(i)) |
| << DF_MMIO_SHIFT; |
| /* Lower D18F0_MMIO_SHIFT address limit bits are all 1 */ |
| limit += (1 << DF_MMIO_SHIFT) - 1; |
| printk(BIOS_SPEW, " %2u %16llx %16llx %8x %s %s %s %4x\n", |
| i, base, limit, control.raw, |
| control.re ? "x" : " ", |
| control.we ? "x" : " ", |
| control.np ? "x" : " ", |
| control.dst_fabric_id); |
| } |
| } |
| |
| 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); |
| } |
| |
| 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(); |
| } |
| |
| static const char *data_fabric_acpi_name(const struct device *dev) |
| { |
| const char *df_acpi_names[8] = { |
| "DFD0", |
| "DFD1", |
| "DFD2", |
| "DFD3", |
| "DFD4", |
| "DFD5", |
| "DFD6", |
| "DFD7" |
| }; |
| |
| if (dev->path.type == DEVICE_PATH_PCI && |
| PCI_SLOT(dev->path.pci.devfn) == DF_DEV) |
| return df_acpi_names[PCI_FUNC(dev->path.pci.devfn)]; |
| |
| printk(BIOS_ERR, "%s: Unhandled device id 0x%x\n", __func__, dev->device); |
| return NULL; |
| } |
| |
| struct device_operations amd_data_fabric_ops = { |
| .read_resources = noop_read_resources, |
| .set_resources = noop_set_resources, |
| .acpi_name = data_fabric_acpi_name, |
| .acpi_fill_ssdt = acpi_device_write_pci_dev, |
| }; |