| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2017 Intel Corporation. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <arch/io.h> |
| #include <cbmem.h> |
| #include <device/device.h> |
| #include <device/pci.h> |
| #include <device/pci_ids.h> |
| #include <intelblocks/systemagent.h> |
| #include <soc/iomap.h> |
| #include <soc/pci_devs.h> |
| #include <soc/systemagent.h> |
| #include "systemagent_def.h" |
| |
| /* SoC override function */ |
| __attribute__((weak)) void soc_systemagent_init(struct device *dev) |
| { |
| /* no-op */ |
| } |
| |
| __attribute__((weak)) void soc_add_fixed_mmio_resources(struct device *dev, |
| int *resource_cnt) |
| { |
| /* no-op */ |
| } |
| |
| /* |
| * Add all known fixed MMIO ranges that hang off the host bridge/memory |
| * controller device. |
| */ |
| void sa_add_fixed_mmio_resources(struct device *dev, int *resource_cnt, |
| const struct sa_mmio_descriptor *sa_fixed_resources, size_t count) |
| { |
| int i; |
| int index = *resource_cnt; |
| |
| for (i = 0; i < count; i++) { |
| uintptr_t base; |
| size_t size; |
| |
| size = sa_fixed_resources[i].size; |
| base = sa_fixed_resources[i].base; |
| |
| mmio_resource(dev, index++, base / KiB, size / KiB); |
| } |
| |
| *resource_cnt = index; |
| } |
| |
| /* |
| * DRAM memory mapped register |
| * |
| * TOUUD: This 64 bit register defines the Top of Upper Usable DRAM |
| * TOLUD: This 32 bit register defines the Top of Low Usable DRAM |
| * BGSM: This register contains the base address of stolen DRAM memory for GTT |
| * TSEG: This register contains the base address of TSEG DRAM memory |
| */ |
| static const struct sa_mem_map_descriptor sa_memory_map[MAX_MAP_ENTRIES] = { |
| { TOUUD, true, "TOUUD" }, |
| { TOLUD, false, "TOLUD" }, |
| { BGSM, false, "BGSM" }, |
| { TSEG, false, "TSEG" }, |
| }; |
| |
| /* Read DRAM memory map register value through PCI configuration space */ |
| static void sa_read_map_entry(device_t dev, |
| const struct sa_mem_map_descriptor *entry, uint64_t *result) |
| { |
| uint64_t value = 0; |
| |
| if (entry->is_64_bit) { |
| value = pci_read_config32(dev, entry->reg + 4); |
| value <<= 32; |
| } |
| |
| value |= pci_read_config32(dev, entry->reg); |
| /* All registers are on a 1MiB granularity. */ |
| value = ALIGN_DOWN(value, 1 * MiB); |
| |
| *result = value; |
| } |
| |
| static void sa_get_mem_map(struct device *dev, uint64_t *values) |
| { |
| int i; |
| for (i = 0; i < MAX_MAP_ENTRIES; i++) |
| sa_read_map_entry(dev, &sa_memory_map[i], &values[i]); |
| } |
| |
| /* |
| * Get DPR size incase CONFIG_SA_ENABLE_DPR is selected by SoC. |
| */ |
| static size_t get_dpr_size(void) |
| { |
| uintptr_t dpr_reg; |
| size_t size = 0; |
| /* |
| * DMA Protected Range can be reserved below TSEG for PCODE patch |
| * or TXT/BootGuard related data. Rather than report a base address |
| * the DPR register reports the TOP of the region, which is the same |
| * as TSEG base. The region size is reported in MiB in bits 11:4. |
| */ |
| dpr_reg = pci_read_config32(SA_DEV_ROOT, DPR); |
| if (dpr_reg & DPR_EPM) |
| size = (dpr_reg & DPR_SIZE_MASK) << 16; |
| |
| return size; |
| } |
| |
| /* |
| * These are the host memory ranges that should be added: |
| * - 0 -> 0xa0000: cacheable |
| * - 0xc0000 -> top_of_ram : cacheable |
| * - top_of_ram -> TSEG - DPR: uncacheable |
| * - TESG - DPR -> BGSM: cacheable with standard MTRRs and reserved |
| * - BGSM -> TOLUD: not cacheable with standard MTRRs and reserved |
| * - 4GiB -> TOUUD: cacheable |
| * |
| * The default SMRAM space is reserved so that the range doesn't |
| * have to be saved during S3 Resume. Once marked reserved the OS |
| * cannot use the memory. This is a bit of an odd place to reserve |
| * the region, but the CPU devices don't have dev_ops->read_resources() |
| * called on them. |
| * |
| * The range 0xa0000 -> 0xc0000 does not have any resources |
| * associated with it to handle legacy VGA memory. If this range |
| * is not omitted the mtrr code will setup the area as cacheable |
| * causing VGA access to not work. |
| * |
| * The TSEG region is mapped as cacheable so that one can perform |
| * SMRAM relocation faster. Once the SMRR is enabled the SMRR takes |
| * precedence over the existing MTRRs covering this region. |
| * |
| * It should be noted that cacheable entry types need to be added in |
| * order. The reason is that the current MTRR code assumes this and |
| * falls over itself if it isn't. |
| * |
| * The resource index starts low and should not meet or exceed |
| * PCI_BASE_ADDRESS_0. |
| */ |
| static void sa_add_dram_resources(struct device *dev, int *resource_count) |
| { |
| uintptr_t base_k, touud_k; |
| size_t dpr_size = 0, size_k; |
| uint64_t sa_map_values[MAX_MAP_ENTRIES]; |
| uintptr_t top_of_ram; |
| int index = *resource_count; |
| |
| if (IS_ENABLED(CONFIG_SA_ENABLE_DPR)) |
| dpr_size = get_dpr_size(); |
| |
| top_of_ram = (uintptr_t)cbmem_top(); |
| |
| /* 0 - > 0xa0000 */ |
| base_k = 0; |
| size_k = (0xa0000 / KiB) - base_k; |
| ram_resource(dev, index++, base_k, size_k); |
| |
| /* 0xc0000 -> top_of_ram */ |
| base_k = 0xc0000 / KiB; |
| size_k = (top_of_ram / KiB) - base_k; |
| ram_resource(dev, index++, base_k, size_k); |
| |
| sa_get_mem_map(dev, &sa_map_values[0]); |
| |
| /* top_of_ram -> TSEG - DPR */ |
| base_k = top_of_ram; |
| size_k = sa_map_values[SA_TSEG_REG] - dpr_size - base_k; |
| mmio_resource(dev, index++, base_k / KiB, size_k / KiB); |
| |
| /* TSEG - DPR -> BGSM */ |
| base_k = sa_map_values[SA_TSEG_REG] - dpr_size; |
| size_k = sa_map_values[SA_BGSM_REG] - base_k; |
| reserved_ram_resource(dev, index++, base_k / KiB, size_k / KiB); |
| |
| /* BGSM -> TOLUD */ |
| base_k = sa_map_values[SA_BGSM_REG]; |
| size_k = sa_map_values[SA_TOLUD_REG] - base_k; |
| mmio_resource(dev, index++, base_k / KiB, size_k / KiB); |
| |
| /* 4GiB -> TOUUD */ |
| base_k = 4 * (GiB / KiB); /* 4GiB */ |
| touud_k = sa_map_values[SA_TOUUD_REG] / KiB; |
| size_k = touud_k - base_k; |
| if (touud_k > base_k) |
| ram_resource(dev, index++, base_k, size_k); |
| |
| /* |
| * Reserve everything between A segment and 1MB: |
| * |
| * 0xa0000 - 0xbffff: legacy VGA |
| * 0xc0000 - 0xfffff: RAM |
| */ |
| mmio_resource(dev, index++, 0xa0000 / KiB, (0xc0000 - 0xa0000) / KiB); |
| reserved_ram_resource(dev, index++, 0xc0000 / KiB, |
| (1*MiB - 0xc0000) / KiB); |
| |
| *resource_count = index; |
| } |
| |
| static bool is_imr_enabled(uint32_t imr_base_reg) |
| { |
| return !!(imr_base_reg & (1 << 31)); |
| } |
| |
| static void imr_resource(device_t dev, int idx, uint32_t base, uint32_t mask) |
| { |
| uint32_t base_k, size_k; |
| /* Bits 28:0 encode the base address bits 38:10, hence the KiB unit. */ |
| base_k = (base & 0x0fffffff); |
| /* Bits 28:0 encode the AND mask used for comparison, in KiB. */ |
| size_k = ((~mask & 0x0fffffff) + 1); |
| /* |
| * IMRs sit in lower DRAM. Mark them cacheable, otherwise we run |
| * out of MTRRs. Memory reserved by IMRs is not usable for host |
| * so mark it reserved. |
| */ |
| reserved_ram_resource(dev, idx, base_k, size_k); |
| } |
| |
| /* |
| * Add IMR ranges that hang off the host bridge/memory |
| * controller device in case CONFIG_SA_ENABLE_IMR is selected by SoC. |
| */ |
| static void sa_add_imr_resources(struct device *dev, int *resource_cnt) |
| { |
| size_t i, imr_offset; |
| uint32_t base, mask; |
| int index = *resource_cnt; |
| |
| for (i = 0; i < MCH_NUM_IMRS; i++) { |
| imr_offset = i * MCH_IMR_PITCH; |
| base = MCHBAR32(imr_offset + MCH_IMR0_BASE); |
| mask = MCHBAR32(imr_offset + MCH_IMR0_MASK); |
| |
| if (is_imr_enabled(base)) |
| imr_resource(dev, index++, base, mask); |
| } |
| |
| *resource_cnt = index; |
| } |
| |
| static void systemagent_read_resources(struct device *dev) |
| { |
| int index = 0; |
| |
| /* Read standard PCI resources. */ |
| pci_dev_read_resources(dev); |
| |
| /* Add all fixed MMIO resources. */ |
| soc_add_fixed_mmio_resources(dev, &index); |
| /* Calculate and add DRAM resources. */ |
| sa_add_dram_resources(dev, &index); |
| if (IS_ENABLED(CONFIG_SA_ENABLE_IMR)) |
| /* Add the isolated memory ranges (IMRs). */ |
| sa_add_imr_resources(dev, &index); |
| } |
| |
| void enable_power_aware_intr(void) |
| { |
| uint8_t pair; |
| |
| /* Enable Power Aware Interrupt Routing */ |
| pair = MCHBAR8(MCH_PAIR); |
| pair &= ~0x7; /* Clear 2:0 */ |
| pair |= 0x4; /* Fixed Priority */ |
| MCHBAR8(MCH_PAIR) = pair; |
| } |
| |
| static struct device_operations systemagent_ops = { |
| .read_resources = &systemagent_read_resources, |
| .set_resources = &pci_dev_set_resources, |
| .enable_resources = &pci_dev_enable_resources, |
| .init = soc_systemagent_init, |
| }; |
| |
| static const unsigned short systemagent_ids[] = { |
| PCI_DEVICE_ID_INTEL_GLK_NB, |
| PCI_DEVICE_ID_INTEL_APL_NB, |
| PCI_DEVICE_ID_INTEL_SKL_ID_U, |
| PCI_DEVICE_ID_INTEL_SKL_ID_Y, |
| PCI_DEVICE_ID_INTEL_SKL_ID_ULX, |
| PCI_DEVICE_ID_INTEL_SKL_ID_H, |
| PCI_DEVICE_ID_INTEL_SKL_ID_H_EM, |
| PCI_DEVICE_ID_INTEL_KBL_ID_U, |
| PCI_DEVICE_ID_INTEL_KBL_ID_Y, |
| PCI_DEVICE_ID_INTEL_KBL_ID_H, |
| PCI_DEVICE_ID_INTEL_KBL_U_R, |
| 0 |
| }; |
| |
| static const struct pci_driver systemagent_driver __pci_driver = { |
| .ops = &systemagent_ops, |
| .vendor = PCI_VENDOR_ID_INTEL, |
| .devices = systemagent_ids |
| }; |