| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* This file is part of the coreboot project. */ |
| |
| #include <cbmem.h> |
| #include <console/console.h> |
| #include <device/pci_ops.h> |
| #include <stdint.h> |
| #include <device/device.h> |
| #include <device/pci.h> |
| #include <device/pci_ids.h> |
| #include <acpi/acpi.h> |
| #include <cpu/intel/smm_reloc.h> |
| #include "i945.h" |
| |
| static int get_pcie_bar(u32 *base) |
| { |
| struct device *dev; |
| u32 pciexbar_reg; |
| |
| *base = 0; |
| |
| dev = pcidev_on_root(0, 0); |
| if (!dev) |
| return 0; |
| |
| pciexbar_reg = pci_read_config32(dev, PCIEXBAR); |
| |
| if (!(pciexbar_reg & (1 << 0))) |
| return 0; |
| |
| switch ((pciexbar_reg >> 1) & 3) { |
| case 0: // 256MB |
| *base = pciexbar_reg & ((1 << 31)|(1 << 30)|(1 << 29)|(1 << 28)); |
| return 256; |
| case 1: // 128M |
| *base = pciexbar_reg & ((1 << 31)|(1 << 30)|(1 << 29)|(1 << 28)|(1 << 27)); |
| return 128; |
| case 2: // 64M |
| *base = pciexbar_reg & ((1 << 31)|(1 << 30)|(1 << 29)|(1 << 28)|(1 << 27)|(1 << 26)); |
| return 64; |
| } |
| |
| return 0; |
| } |
| |
| static void mch_domain_read_resources(struct device *dev) |
| { |
| uint32_t pci_tolm, tseg_sizek, cbmem_topk, delta_cbmem; |
| uint8_t tolud; |
| uint16_t reg16; |
| unsigned long long tomk, tomk_stolen; |
| uint64_t uma_memory_base = 0, uma_memory_size = 0; |
| uint64_t tseg_memory_base = 0, tseg_memory_size = 0; |
| struct device *const d0f0 = pcidev_on_root(0, 0); |
| |
| pci_domain_read_resources(dev); |
| |
| /* Can we find out how much memory we can use at most |
| * this way? |
| */ |
| pci_tolm = find_pci_tolm(dev->link_list); |
| printk(BIOS_DEBUG, "pci_tolm: 0x%x\n", pci_tolm); |
| |
| tolud = pci_read_config8(d0f0, TOLUD); |
| printk(BIOS_SPEW, "Top of Low Used DRAM: 0x%08x\n", tolud << 24); |
| |
| tomk = tolud << 14; |
| tomk_stolen = tomk; |
| |
| /* Note: subtract IGD device and TSEG */ |
| reg16 = pci_read_config16(d0f0, GGC); |
| if (!(reg16 & 2)) { |
| printk(BIOS_DEBUG, "IGD decoded, subtracting "); |
| int uma_size = decode_igd_memory_size((reg16 >> 4) & 7); |
| |
| printk(BIOS_DEBUG, "%dM UMA\n", uma_size >> 10); |
| tomk_stolen -= uma_size; |
| |
| /* For reserving UMA memory in the memory map */ |
| uma_memory_base = tomk_stolen * 1024ULL; |
| uma_memory_size = uma_size * 1024ULL; |
| |
| printk(BIOS_SPEW, "Base of stolen memory: 0x%08x\n", |
| (unsigned int)uma_memory_base); |
| } |
| |
| tseg_sizek = decode_tseg_size(pci_read_config8(d0f0, ESMRAMC)) >> 10; |
| printk(BIOS_DEBUG, "TSEG decoded, subtracting %dM\n", tseg_sizek >> 10); |
| tomk_stolen -= tseg_sizek; |
| tseg_memory_base = tomk_stolen * 1024ULL; |
| tseg_memory_size = tseg_sizek * 1024ULL; |
| |
| /* cbmem_top can be shifted downwards due to alignment. |
| Mark the region between cbmem_top and tomk as unusable */ |
| cbmem_topk = ((uint32_t)cbmem_top() >> 10); |
| delta_cbmem = tomk_stolen - cbmem_topk; |
| tomk_stolen -= delta_cbmem; |
| |
| printk(BIOS_DEBUG, "Unused RAM between cbmem_top and TOM: 0x%xK\n", delta_cbmem); |
| |
| |
| /* The following needs to be 2 lines, otherwise the second |
| * number is always 0 |
| */ |
| printk(BIOS_INFO, "Available memory: %dK", (uint32_t)tomk_stolen); |
| printk(BIOS_INFO, " (%dM)\n", (uint32_t)(tomk_stolen >> 10)); |
| |
| /* Report the memory regions */ |
| ram_resource(dev, 3, 0, 640); |
| ram_resource(dev, 4, 768, (tomk - 768)); |
| uma_resource(dev, 5, uma_memory_base >> 10, uma_memory_size >> 10); |
| mmio_resource(dev, 6, tseg_memory_base >> 10, tseg_memory_size >> 10); |
| uma_resource(dev, 7, cbmem_topk, delta_cbmem); |
| } |
| |
| static void mch_domain_set_resources(struct device *dev) |
| { |
| struct resource *res; |
| |
| for (res = dev->resource_list; res; res = res->next) |
| report_resource_stored(dev, res, ""); |
| |
| assign_resources(dev->link_list); |
| } |
| |
| static const char *northbridge_acpi_name(const struct device *dev) |
| { |
| if (dev->path.type == DEVICE_PATH_DOMAIN) |
| return "PCI0"; |
| |
| if (dev->path.type != DEVICE_PATH_PCI || dev->bus->secondary != 0) |
| return NULL; |
| |
| switch (dev->path.pci.devfn) { |
| case PCI_DEVFN(0, 0): |
| return "MCHC"; |
| } |
| |
| return NULL; |
| } |
| |
| void northbridge_write_smram(u8 smram) |
| { |
| struct device *dev = pcidev_on_root(0, 0); |
| |
| if (dev == NULL) |
| die("could not find pci 00:00.0!\n"); |
| |
| pci_write_config8(dev, SMRAM, smram); |
| } |
| |
| /* TODO We could determine how many PCIe busses we need in |
| * the bar. For now that number is hardcoded to a max of 64. |
| */ |
| static struct device_operations pci_domain_ops = { |
| .read_resources = mch_domain_read_resources, |
| .set_resources = mch_domain_set_resources, |
| .scan_bus = pci_domain_scan_bus, |
| .acpi_name = northbridge_acpi_name, |
| }; |
| |
| static void mc_read_resources(struct device *dev) |
| { |
| u32 pcie_config_base; |
| int buses; |
| |
| pci_dev_read_resources(dev); |
| |
| buses = get_pcie_bar(&pcie_config_base); |
| if (buses) { |
| struct resource *resource = new_resource(dev, PCIEXBAR); |
| mmconf_resource_init(resource, pcie_config_base, buses); |
| } |
| } |
| |
| static struct pci_operations intel_pci_ops = { |
| .set_subsystem = pci_dev_set_subsystem, |
| }; |
| |
| static struct device_operations mc_ops = { |
| .read_resources = mc_read_resources, |
| .set_resources = pci_dev_set_resources, |
| .enable_resources = pci_dev_enable_resources, |
| .acpi_fill_ssdt = generate_cpu_entries, |
| .ops_pci = &intel_pci_ops, |
| }; |
| |
| static const unsigned short pci_device_ids[] = { |
| 0x2770, /* desktop */ |
| 0x27a0, 0x27ac, /* mobile */ |
| 0 }; |
| |
| static const struct pci_driver mc_driver __pci_driver = { |
| .ops = &mc_ops, |
| .vendor = PCI_VENDOR_ID_INTEL, |
| .devices = pci_device_ids, |
| }; |
| |
| static struct device_operations cpu_bus_ops = { |
| .read_resources = noop_read_resources, |
| .set_resources = noop_set_resources, |
| .init = mp_cpu_bus_init, |
| }; |
| |
| static void enable_dev(struct device *dev) |
| { |
| /* Set the operations if it is a special bus type */ |
| if (dev->path.type == DEVICE_PATH_DOMAIN) |
| dev->ops = &pci_domain_ops; |
| else if (dev->path.type == DEVICE_PATH_CPU_CLUSTER) |
| dev->ops = &cpu_bus_ops; |
| } |
| |
| struct chip_operations northbridge_intel_i945_ops = { |
| CHIP_NAME("Intel i945 Northbridge") |
| .enable_dev = enable_dev, |
| }; |