/* * This file is part of the coreboot project. * * Copyright (C) 2008 VIA Technologies, Inc. * (Written by Aaron Lwe for VIA) * 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 #include "chip.h" #include "northbridge.h" #include "cn700.h" static void memctrl_init(device_t dev) { device_t vlink_dev; u16 reg16; u8 ranks; u8 pagec, paged, pagee, pagef; u8 shadowreg; /* Set up the vga framebuffer size */ reg16 = (log2(CONFIG_VIDEO_MB) << 12) | (1 << 15); pci_write_config16(dev, 0xa0, reg16); /* Set up VGA timers */ pci_write_config8(dev, 0xa2, 0x44); for (ranks = 0x4b; ranks >= 0x48; ranks--) { if (pci_read_config8(dev, ranks)) { ranks -= 0x48; break; } } if (ranks == 0x47) ranks = 0x00; reg16 = 0xaae0; reg16 |= ranks; /* GMINT Misc. FrameBuffer rank */ pci_write_config16(dev, 0xb0, reg16); /* AGPCINT Misc. */ pci_write_config8(dev, 0xb8, 0x08); /* shadown ram */ pagec = 0xff, paged = 0xff, pagee = 0xff, pagef = 0x30; /* PAGE C, D, E are all read write enable */ pci_write_config8(dev, 0x80, pagec); pci_write_config8(dev, 0x81, paged); pci_write_config8(dev, 0x82, pagee); /* PAGE F are read/writable */ shadowreg = pci_read_config8(dev, 0x83); shadowreg |= pagef; pci_write_config8(dev, 0x83, shadowreg); /* vlink mirror */ vlink_dev = dev_find_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_CN700_VLINK, 0); if (vlink_dev) { pci_write_config8(vlink_dev, 0x61, pagec); pci_write_config8(vlink_dev, 0x62, paged); pci_write_config8(vlink_dev, 0x64, pagee); shadowreg = pci_read_config8(vlink_dev, 0x63); shadowreg |= pagef; pci_write_config8(vlink_dev, 0x63, shadowreg); } } static const struct device_operations memctrl_operations = { .read_resources = cn700_noop, .init = memctrl_init, }; static const struct pci_driver memctrl_driver __pci_driver = { .ops = &memctrl_operations, .vendor = PCI_VENDOR_ID_VIA, .device = PCI_DEVICE_ID_VIA_CN700_MEMCTRL, }; static void pci_domain_read_resources(device_t dev) { struct resource *resource; printk_spew("Entering cn700 pci_domain_read_resources.\n"); /* Initialize the system wide io space constraints */ resource = new_resource(dev, IOINDEX_SUBTRACTIVE(0,0)); 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; printk_spew("Leaving cn700 pci_domain_read_resources.\n"); } 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 u32 find_pci_tolm(struct bus *bus) { print_debug("Entering find_pci_tolm\n"); struct resource *min; u32 tolm; min = 0; search_bus_resources(bus, IORESOURCE_MEM, IORESOURCE_MEM, tolm_test, &min); tolm = 0xffffffffUL; if (min && tolm > min->base) { tolm = min->base; } print_debug("Leaving find_pci_tolm\n"); return tolm; } static void pci_domain_set_resources(device_t dev) { /* * the order is important to find the correct ram size. */ static const u8 ramregs[] = {0x43, 0x42, 0x41, 0x40}; device_t mc_dev; u32 pci_tolm; printk_spew("Entering cn700 pci_domain_set_resources.\n"); pci_tolm = find_pci_tolm(&dev->link[0]); mc_dev = dev_find_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_CN700_MEMCTRL, 0); if (mc_dev) { unsigned long tomk, tolmk; unsigned char rambits; int i, idx; /* * once the register value is not zero, the ramsize is * this register's value multiply 64 * 1024 * 1024 */ for(rambits = 0, i = 0; i < ARRAY_SIZE(ramregs); i++) { unsigned char reg; rambits = pci_read_config8(mc_dev, ramregs[i]); if (rambits != 0) break; } tomk = rambits * 64 * 1024; printk_spew("tomk is 0x%x\n", tomk); /* Compute the Top Of Low Memory, in Kb */ tolmk = pci_tolm >> 10; if (tolmk >= tomk) { /* The PCI hole does does not overlap the memory. */ tolmk = tomk; } /* Report the memory regions */ idx = 10; /* TODO: Hole needed? */ ram_resource(dev, idx++, 0, 640); /* first 640k */ /* Leave a hole for vga, 0xa0000 - 0xc0000 */ ram_resource(dev, idx++, 768, (tolmk - 768 - CONFIG_VIDEO_MB * 1024)); } assign_resources(&dev->link[0]); } static unsigned int pci_domain_scan_bus(device_t dev, unsigned int max) { printk_debug("Entering cn700 pci_domain_scan_bus.\n"); max = pci_scan_bus(&dev->link[0], PCI_DEVFN(0, 0), 0xff, max); return max; } static const 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 const 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) { printk_spew("In cn700 enable_dev for device %s.\n", dev_path(dev)); /* 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_via_cn700_ops = { CHIP_NAME("VIA CN700 Northbridge") .enable_dev = enable_dev, };