| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <device/device.h> |
| #include <device/pci.h> |
| #include <device/pci_ids.h> |
| #include <vendorcode/google/chromeos/chromeos.h> |
| #include <acpi/acpi.h> |
| #include <stdint.h> |
| #include <soc/iomap.h> |
| #include <soc/iosf.h> |
| #include <soc/pci_devs.h> |
| #include <soc/ramstage.h> |
| |
| /* |
| * Host Memory Map: |
| * |
| * +--------------------------+ BMBOUND_HI |
| * | Usable DRAM | |
| * +--------------------------+ 4GiB |
| * | PCI Address Space | |
| * +--------------------------+ BMBOUND |
| * | TPM | |
| * +--------------------------+ IMR2 |
| * | TXE | |
| * +--------------------------+ IMR1 |
| * | iGD | |
| * +--------------------------+ |
| * | GTT | |
| * +--------------------------+ SMMRRH, IRM0 |
| * | TSEG | |
| * +--------------------------+ SMMRRL |
| * | Usable DRAM | |
| * +--------------------------+ 0 |
| * |
| * Note that there are really only a few regions that need to enumerated w.r.t. |
| * coreboot's resource model: |
| * |
| * +--------------------------+ BMBOUND_HI |
| * | Cacheable/Usable | |
| * +--------------------------+ 4GiB |
| * |
| * +--------------------------+ BMBOUND |
| * | Uncacheable/Reserved | |
| * +--------------------------+ SMMRRH |
| * | Cacheable/Reserved | |
| * +--------------------------+ SMMRRL |
| * | Cacheable/Usable | |
| * +--------------------------+ 0 |
| */ |
| #define RES_IN_KiB(r) ((r) >> 10) |
| |
| uint32_t nc_read_top_of_low_memory(void) |
| { |
| static uint32_t tolm; |
| |
| if (tolm) |
| return tolm; |
| |
| tolm = iosf_bunit_read(BUNIT_BMBOUND) & ~((1 << 27) - 1); |
| |
| return tolm; |
| } |
| |
| static void nc_read_resources(struct device *dev) |
| { |
| unsigned long mmconf; |
| unsigned long bmbound_k; |
| unsigned long bmbound_hi; |
| unsigned long smmrrh; |
| unsigned long smmrrl; |
| unsigned long base_k, size_k; |
| const unsigned long four_gig_kib = (4 << (30 - 10)); |
| int index = 0; |
| |
| /* Read standard PCI resources. */ |
| pci_dev_read_resources(dev); |
| |
| /* PCIe memory-mapped config space access - 256 MiB. */ |
| mmconf = iosf_bunit_read(BUNIT_MMCONF_REG) & ~((1 << 28) - 1); |
| mmio_resource(dev, BUNIT_MMCONF_REG, RES_IN_KiB(mmconf), 256 * 1024); |
| |
| /* 0 -> 0xa0000 */ |
| base_k = RES_IN_KiB(0); |
| size_k = RES_IN_KiB(0xa0000) - base_k; |
| ram_resource(dev, index++, base_k, size_k); |
| |
| /* The SMMRR registers are 1MiB granularity with smmrrh being |
| * inclusive of the SMM region. */ |
| smmrrl = (iosf_bunit_read(BUNIT_SMRRL) & 0xffff) << 10; |
| smmrrh = ((iosf_bunit_read(BUNIT_SMRRH) & 0xffff) + 1) << 10; |
| |
| /* 0xc0000 -> smrrl - cacheable and usable */ |
| base_k = RES_IN_KiB(0xc0000); |
| size_k = smmrrl - base_k; |
| ram_resource(dev, index++, base_k, size_k); |
| |
| if (smmrrh > smmrrl) |
| reserved_ram_resource(dev, index++, smmrrl, smmrrh - smmrrl); |
| |
| /* All address space between bmbound and smmrrh is unusable. */ |
| bmbound_k = RES_IN_KiB(nc_read_top_of_low_memory()); |
| mmio_resource(dev, index++, smmrrh, bmbound_k - smmrrh); |
| |
| /* The BMBOUND_HI register matches register bits of 31:24 with address |
| * bits of 35:28. Therefore, shift register to align properly. */ |
| bmbound_hi = iosf_bunit_read(BUNIT_BMBOUND_HI) & ~((1 << 24) - 1); |
| bmbound_hi = RES_IN_KiB(bmbound_hi) << 4; |
| if (bmbound_hi > four_gig_kib) |
| ram_resource(dev, index++, four_gig_kib, bmbound_hi - four_gig_kib); |
| |
| /* Reserve everything between A segment and 1MB: |
| * |
| * 0xa0000 - 0xbffff: legacy VGA |
| * 0xc0000 - 0xfffff: RAM |
| */ |
| mmio_resource(dev, index++, (0xa0000 >> 10), (0xc0000 - 0xa0000) >> 10); |
| reserved_ram_resource(dev, index++, (0xc0000 >> 10), (0x100000 - 0xc0000) >> 10); |
| |
| if (CONFIG(CHROMEOS)) |
| chromeos_reserve_ram_oops(dev, index++); |
| } |
| |
| static struct device_operations nc_ops = { |
| .read_resources = nc_read_resources, |
| .acpi_fill_ssdt = generate_cpu_entries, |
| .ops_pci = &soc_pci_ops, |
| }; |
| |
| static const struct pci_driver nc_driver __pci_driver = { |
| .ops = &nc_ops, |
| .vendor = PCI_VENDOR_ID_INTEL, |
| .device = SOC_DEVID, |
| }; |