diff options
Diffstat (limited to 'src/northbridge/intel/e7520/northbridge.c')
-rw-r--r-- | src/northbridge/intel/e7520/northbridge.c | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/src/northbridge/intel/e7520/northbridge.c b/src/northbridge/intel/e7520/northbridge.c new file mode 100644 index 0000000..160c5a7 --- /dev/null +++ b/src/northbridge/intel/e7520/northbridge.c @@ -0,0 +1,270 @@ +#include <console/console.h> +#include <arch/io.h> +#include <stdint.h> +#include <device/device.h> +#include <device/pci.h> +#include <device/pci_ids.h> +#include <device/hypertransport.h> +#include <stdlib.h> +#include <string.h> +#include <bitops.h> +#include <cpu/cpu.h> +#include "chip.h" +#include "northbridge.h" +#include "e7520.h" + + +static unsigned int max_bus; + +static void ram_resource(device_t dev, unsigned long index, + unsigned long basek, unsigned long sizek) +{ + struct resource *resource; + + 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 pci_domain_read_resources(device_t dev) +{ + struct resource *resource; + + /* Initialize the system wide io space constraints */ + resource = new_resource(dev, IOINDEX_SUBTRACTIVE(0,0)); + resource->base = 0; + resource->size = 0; + resource->align = 0; + resource->gran = 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->base = 0; + resource->size = 0; + resource->align = 0; + resource->gran = 0; + resource->limit = 0xffffffffUL; + resource->flags = IORESOURCE_MEM | IORESOURCE_SUBTRACTIVE | 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) +{ + device_t mc_dev; + uint32_t pci_tolm; + + pci_tolm = find_pci_tolm(&dev->link[0]); + +#if 1 + printk_debug("PCI mem marker = %x\n", pci_tolm); +#endif + /* FIXME Me temporary hack */ + if(pci_tolm > 0xe0000000) + pci_tolm = 0xe0000000; + /* Ensure pci_tolm is 128M aligned */ + pci_tolm &= 0xf8000000; + 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, remapoffset_r; + unsigned long tomk, tolmk; + unsigned long remapbasek, remaplimitk, remapoffsetk; + + /* Get the Top of Memory address, units are 128M */ + tomk = ((unsigned long)pci_read_config16(mc_dev, TOM)) << 17; + /* Compute the Top of Low Memory */ + tolmk = (pci_tolm & 0xf8000000) >> 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; + remapoffsetk = 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)); + /* Find the offset of the remap window from tolm */ + remapoffsetk = remapbasek - tolmk; + } + /* Write the ram configruation 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); + + remapoffset_r = pci_read_config16(mc_dev, 0xca); + remapoffset_r = (remapoffsetk >> 16) | (remapoffset_r & 0xfc00); + pci_write_config16(mc_dev, 0xca, remapoffset_r); + + /* Report the memory regions */ + ram_resource(dev, 3, 0, 640); + ram_resource(dev, 4, 768, (tolmk - 768)); + if (tomk > 4*1024*1024) { + ram_resource(dev, 5, 4096*1024, tomk - 4*1024*1024); + } + if (remaplimitk >= remapbasek) { + ram_resource(dev, 6, 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], 0, 0xff, max); + if (max > max_bus) { + max_bus = 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, + .ops_pci_bus = &pci_cf8_conf1, /* Do we want to use the memory mapped space here? */ +}; + +static void mc_read_resources(device_t dev) +{ + struct resource *resource; + + pci_dev_read_resources(dev); + + resource = new_resource(dev, 0xcf); + resource->base = 0xe0000000; + resource->size = max_bus * 4096*256; + resource->flags = IORESOURCE_MEM | IORESOURCE_FIXED | IORESOURCE_STORED | IORESOURCE_ASSIGNED; +} + +static void mc_set_resources(device_t dev) +{ + struct resource *resource, *last; + + last = &dev->resource[dev->resources]; + resource = find_resource(dev, 0xcf); + if (resource) { + report_resource_stored(dev, resource, "<mmconfig>"); + } + pci_dev_set_resources(dev); +} + +static void intel_set_subsystem(device_t dev, unsigned vendor, unsigned device) +{ + pci_write_config32(dev, PCI_SUBSYSTEM_VENDOR_ID, + ((device & 0xffff) << 16) | (vendor & 0xffff)); +} + +static struct pci_operations intel_pci_ops = { + .set_subsystem = intel_set_subsystem, +}; + +static struct device_operations mc_ops = { + .read_resources = mc_read_resources, + .set_resources = mc_set_resources, + .enable_resources = pci_dev_enable_resources, + .init = 0, + .scan_bus = 0, + .ops_pci = &intel_pci_ops, +}; + +static struct pci_driver mc_driver __pci_driver = { + .ops = &mc_ops, + .vendor = PCI_VENDOR_ID_INTEL, + .device = 0x3590, +}; + +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(device_t dev) +{ + /* Set the operations if it is a special bus type */ + if (dev->path.type == DEVICE_PATH_PCI_DOMAIN) { + dev->ops = &pci_domain_ops; + } + else if (dev->path.type == DEVICE_PATH_APIC_CLUSTER) { + dev->ops = &cpu_bus_ops; + } +} + +struct chip_operations northbridge_intel_e7520_ops = { + CHIP_NAME("Intel E7520 Northbridge") + .enable_dev = enable_dev, +}; |