/* * This file is part of the coreboot project. * * Copyright (C) 2007 Corey Osgood * * 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; either version 2 of the License, or * (at your option) any later version. * * 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. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include #include #include #include #include #include #include #include #include #include "chip.h" #include "northbridge.h" #include "i82810.h" static void northbridge_init(device_t dev) { printk_spew("Northbridge init\n"); } static struct device_operations northbridge_operations = { .read_resources = pci_dev_read_resources, .set_resources = pci_dev_set_resources, .enable_resources = pci_dev_enable_resources, .init = northbridge_init, .enable = 0, .ops_pci = 0, }; static const struct pci_driver northbridge_driver __pci_driver = { .ops = &northbridge_operations, .vendor = PCI_VENDOR_ID_INTEL, .device = 0x7120, }; #define BRIDGE_IO_MASK (IORESOURCE_IO | IORESOURCE_MEM) static void pci_domain_read_resources(device_t dev) { struct resource *resource; unsigned reg; /* Initialize the system wide io space constraints */ resource = new_resource(dev, IOINDEX_SUBTRACTIVE(0, 0)); resource->base = 0x400; resource->limit = 0xffffUL; resource->flags = IORESOURCE_IO | IORESOURCE_SUBTRACTIVE | IORESOURCE_ASSIGNED; /* Initialize the system wide memory resources constraints */ resource = new_resource(dev, IOINDEX_SUBTRACTIVE(1, 0)); resource->limit = 0xffffffffULL; resource->flags = IORESOURCE_MEM | IORESOURCE_SUBTRACTIVE | IORESOURCE_ASSIGNED; } static void ram_resource(device_t dev, unsigned long index, unsigned long basek, unsigned long sizek) { struct resource *resource; if (!sizek) { return; } resource = new_resource(dev, index); resource->base = ((resource_t) basek) << 10; resource->size = ((resource_t) sizek) << 10; resource->flags = IORESOURCE_MEM | IORESOURCE_CACHEABLE | IORESOURCE_FIXED | IORESOURCE_STORED | IORESOURCE_ASSIGNED; } static void tolm_test(void *gp, struct device *dev, struct resource *new) { struct resource **best_p = gp; struct resource *best; best = *best_p; if (!best || (best->base > new->base)) { best = new; } *best_p = best; } static uint32_t find_pci_tolm(struct bus *bus) { struct resource *min; uint32_t tolm; min = 0; search_bus_resources(bus, IORESOURCE_MEM, IORESOURCE_MEM, tolm_test, &min); tolm = 0xffffffffUL; if (min && tolm > min->base) { tolm = min->base; } return tolm; } /* Table which returns the RAM size in MB when fed the DRP[7:4] or [3:0] value. * Note that 2 is a value which the DRP should never be programmed to. * Some size values appear twice, due to single-sided vs dual-sided banks. */ static int translate_i82810_to_mb[] = { /* DRP 0 1 (2) 3 4 5 6 7 8 9 A B C D E F */ /* MB */0, 8, 0, 16, 16, 24, 32, 32, 48, 64, 64, 96, 128, 128, 192, 256, }; static void pci_domain_set_resources(device_t dev) { device_t mc_dev; uint32_t pci_tolm; pci_tolm = find_pci_tolm(&dev->link[0]); mc_dev = dev->link[0].children; if (mc_dev) { /* Figure out which areas are/should be occupied by RAM. * This is all computed in kilobytes and converted to/from * the memory controller right at the edges. * Having different variables in different units is * too confusing to get right. Kilobytes are good up to * 4 Terabytes of RAM... */ unsigned long tomk, tolmk; int idx; int drp_value; /* First get the value for DIMM 0. */ drp_value = pci_read_config8(mc_dev, DRP); /* Translate it to MB and add to tomk. */ tomk = (unsigned long)(translate_i82810_to_mb[drp_value & 0xf]); /* Now do the same for DIMM 1. */ drp_value = drp_value >> 4; // >>= 4; //? mess with later tomk += (unsigned long)(translate_i82810_to_mb[drp_value]); printk_debug("Setting RAM size to %d MB\n", tomk); /* Convert tomk from MB to KB. */ tomk = tomk << 10; /* Compute the top of Low memory. */ tolmk = pci_tolm >> 10; if (tolmk >= tomk) { /* The PCI hole does does not overlap the memory. */ tolmk = tomk; } /* Report the memory regions. */ idx = 10; ram_resource(dev, idx++, 0, 640); ram_resource(dev, idx++, 1024, tolmk - 1024); } assign_resources(&dev->link[0]); } static unsigned int pci_domain_scan_bus(device_t dev, unsigned int max) { max = pci_scan_bus(&dev->link[0], PCI_DEVFN(0, 0), 0xff, max); return max; } static struct device_operations pci_domain_ops = { .read_resources = pci_domain_read_resources, .set_resources = pci_domain_set_resources, .enable_resources = enable_childrens_resources, .init = 0, .scan_bus = pci_domain_scan_bus, }; static void cpu_bus_init(device_t dev) { initialize_cpus(&dev->link[0]); } static void cpu_bus_noop(device_t dev) { } static struct device_operations cpu_bus_ops = { .read_resources = cpu_bus_noop, .set_resources = cpu_bus_noop, .enable_resources = cpu_bus_noop, .init = cpu_bus_init, .scan_bus = 0, }; static void enable_dev(struct device *dev) { struct device_path path; /* Set the operations if it is a special bus type */ if (dev->path.type == DEVICE_PATH_PCI_DOMAIN) { dev->ops = &pci_domain_ops; pci_set_method(dev); } else if (dev->path.type == DEVICE_PATH_APIC_CLUSTER) { dev->ops = &cpu_bus_ops; } } struct chip_operations northbridge_intel_i82810_ops = { CHIP_NAME("Intel 82810 Northbridge") .enable_dev = enable_dev, };