diff options
Diffstat (limited to 'src/northbridge/intel/e7501/root_complex/root_complex.c')
-rw-r--r-- | src/northbridge/intel/e7501/root_complex/root_complex.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/src/northbridge/intel/e7501/root_complex/root_complex.c b/src/northbridge/intel/e7501/root_complex/root_complex.c new file mode 100644 index 0000000000..4e4dc5b3fe --- /dev/null +++ b/src/northbridge/intel/e7501/root_complex/root_complex.c @@ -0,0 +1,193 @@ +#include <console/console.h> +#include <arch/io.h> +#include <stdint.h> +#include <device/device.h> +#include <device/pci.h> +#include <stdlib.h> +#include <string.h> +#include <bitops.h> +#include "chip.h" + +#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->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; +} + +static void pci_domain_set_resources(device_t dev) +{ + struct resource *resource, *last; + 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... + */ + uint16_t tolm_r, remapbase_r, remaplimit_r; + unsigned long tomk, tolmk; + unsigned long remapbasek, remaplimitk; + int idx; + + /* Get the value of the highest DRB. This tells the end of + * the physical memory. The units are ticks of 64MB + * i.e. 1 means 64MB. + */ + tomk = ((unsigned long)pci_read_config8(mc_dev, 0x67)) << 16; + /* Compute the top of Low memory */ + tolmk = pci_tolm >> 10; + if (tolmk >= tomk) { + /* The PCI hole does not overlap memory + * we won't use the remap window. + */ + tolmk = tomk; + remapbasek = 0x3ff << 16; + remaplimitk = 0 << 16; + } + else { + /* The PCI memory hole overlaps memory + * setup the remap window. + */ + /* Find the bottom of the remap window + * is it above 4G? + */ + remapbasek = 4*1024*1024; + if (tomk > remapbasek) { + remapbasek = tomk; + } + /* Find the limit of the remap window */ + remaplimitk = (remapbasek + (4*1024*1024 - tolmk) - (1 << 16)); + } + /* Write the ram configuration registers, + * preserving the reserved bits. + */ + tolm_r = pci_read_config16(mc_dev, 0xc4); + tolm_r = ((tolmk >> 17) << 11) | (tolm_r & 0x7ff); + pci_write_config16(mc_dev, 0xc4, tolm_r); + + remapbase_r = pci_read_config16(mc_dev, 0xc6); + remapbase_r = (remapbasek >> 16) | (remapbase_r & 0xfc00); + pci_write_config16(mc_dev, 0xc6, remapbase_r); + + remaplimit_r = pci_read_config16(mc_dev, 0xc8); + remaplimit_r = (remaplimitk >> 16) | (remaplimit_r & 0xfc00); + pci_write_config16(mc_dev, 0xc8, remaplimit_r); + + /* Report the memory regions */ + idx = 10; + ram_resource(dev, idx++, 0, 640); + ram_resource(dev, idx++, 768, tolmk - 768); + if (tomk > 4*1024*1024) { + ram_resource(dev, idx++, 4096*1024, tomk - 4*1024*1024); + } + if (remaplimitk >= remapbasek) { + ram_resource(dev, idx++, remapbasek, + (remaplimitk + 64*1024) - remapbasek); + } + } + 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) +{ + /* 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_conf1(); + } + else if (dev->path.type == DEVICE_PATH_APIC_CLUSTER) { + dev->ops = &cpu_bus_ops; + } +} +struct chip_operations northbridge_intel_e7501_root_complex_ops = { + CHIP_NAME("Intel E7501 Root Complex") + .enable_dev = enable_dev, +}; |