/* * arch/ppc/kernel/pci_auto.c * * PCI autoconfiguration library * * Author: Matt Porter * * Copyright 2000 MontaVista Software Inc. * * 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. */ #include #ifdef CONFIG_PCI #include #undef DEBUG #ifdef DEBUG #define DEBUGF(x...) printf(x) #else #define DEBUGF(x...) #endif /* DEBUG */ #define PCIAUTO_IDE_MODE_MASK 0x05 /* * */ void pciauto_region_init(struct pci_region* res) { /* * Avoid allocating PCI resources from address 0 -- this is illegal * according to PCI 2.1 and moreover, this is known to cause Linux IDE * drivers to fail. Use a reasonable starting value of 0x1000 instead. */ res->bus_lower = res->bus_start ? res->bus_start : 0x1000; } void pciauto_region_align(struct pci_region *res, unsigned long size) { res->bus_lower = ((res->bus_lower - 1) | (size - 1)) + 1; } int pciauto_region_allocate(struct pci_region* res, unsigned int size, unsigned int *bar) { unsigned long addr; if (!res) { DEBUGF("No resource"); goto error; } addr = ((res->bus_lower - 1) | (size - 1)) + 1; if (addr - res->bus_start + size > res->size) { DEBUGF("No room in resource"); goto error; } res->bus_lower = addr + size; DEBUGF("address=0x%lx bus_lower=%x", addr, res->bus_lower); *bar = addr; return 0; error: *bar = 0xffffffff; return -1; } /* * */ void pciauto_setup_device(struct pci_controller *hose, pci_dev_t dev, int bars_num, struct pci_region *mem, struct pci_region *prefetch, struct pci_region *io) { unsigned int bar_value, bar_response, bar_size; unsigned int cmdstat = 0; struct pci_region *bar_res; int bar, bar_nr = 0; int found_mem64 = 0; pci_hose_read_config_dword(hose, dev, PCI_COMMAND, &cmdstat); cmdstat = (cmdstat & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) | PCI_COMMAND_MASTER; for (bar = PCI_BASE_ADDRESS_0; bar <= PCI_BASE_ADDRESS_0 + (bars_num*4); bar += 4) { /* Tickle the BAR and get the response */ pci_hose_write_config_dword(hose, dev, bar, 0xffffffff); pci_hose_read_config_dword(hose, dev, bar, &bar_response); /* If BAR is not implemented go to the next BAR */ if (!bar_response) continue; found_mem64 = 0; /* Check the BAR type and set our address mask */ if (bar_response & PCI_BASE_ADDRESS_SPACE) { bar_size = ((~(bar_response & PCI_BASE_ADDRESS_IO_MASK)) & 0xffff) + 1; bar_res = io; DEBUGF("PCI Autoconfig: BAR %d, I/O, size=0x%x, ", bar_nr, bar_size); } else { if ( (bar_response & PCI_BASE_ADDRESS_MEM_TYPE_MASK) == PCI_BASE_ADDRESS_MEM_TYPE_64) found_mem64 = 1; bar_size = ~(bar_response & PCI_BASE_ADDRESS_MEM_MASK) + 1; if (prefetch && (bar_response & PCI_BASE_ADDRESS_MEM_PREFETCH)) bar_res = prefetch; else bar_res = mem; DEBUGF("PCI Autoconfig: BAR %d, Mem, size=0x%x, ", bar_nr, bar_size); } if (pciauto_region_allocate(bar_res, bar_size, &bar_value) == 0) { /* Write it out and update our limit */ pci_hose_write_config_dword(hose, dev, bar, bar_value); /* * If we are a 64-bit decoder then increment to the * upper 32 bits of the bar and force it to locate * in the lower 4GB of memory. */ if (found_mem64) { bar += 4; pci_hose_write_config_dword(hose, dev, bar, 0x00000000); } cmdstat |= (bar_response & PCI_BASE_ADDRESS_SPACE) ? PCI_COMMAND_IO : PCI_COMMAND_MEMORY; } DEBUGF("\n"); bar_nr++; } pci_hose_write_config_dword(hose, dev, PCI_COMMAND, cmdstat); pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE, 0x08); pci_hose_write_config_byte(hose, dev, PCI_LATENCY_TIMER, 0x80); } void pciauto_prescan_setup_bridge(struct pci_controller *hose, pci_dev_t dev, int sub_bus) { struct pci_region *pci_mem = hose->pci_mem; struct pci_region *pci_prefetch = hose->pci_prefetch; struct pci_region *pci_io = hose->pci_io; unsigned int cmdstat; pci_hose_read_config_dword(hose, dev, PCI_COMMAND, &cmdstat); /* Configure bus number registers */ pci_hose_write_config_byte(hose, dev, PCI_PRIMARY_BUS, PCI_BUS(dev) - hose->first_busno); pci_hose_write_config_byte(hose, dev, PCI_SECONDARY_BUS, sub_bus - hose->first_busno); pci_hose_write_config_byte(hose, dev, PCI_SUBORDINATE_BUS, 0xff); if (pci_mem) { /* Round memory allocator to 1MB boundary */ pciauto_region_align(pci_mem, 0x100000); /* Set up memory and I/O filter limits, assume 32-bit I/O space */ pci_hose_write_config_word(hose, dev, PCI_MEMORY_BASE, (pci_mem->bus_lower & 0xfff00000) >> 16); cmdstat |= PCI_COMMAND_MEMORY; } if (pci_prefetch) { /* Round memory allocator to 1MB boundary */ pciauto_region_align(pci_prefetch, 0x100000); /* Set up memory and I/O filter limits, assume 32-bit I/O space */ pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_BASE, (pci_prefetch->bus_lower & 0xfff00000) >> 16); cmdstat |= PCI_COMMAND_MEMORY; } else { /* We don't support prefetchable memory for now, so disable */ pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_BASE, 0x1000); pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_LIMIT, 0x0); } if (pci_io) { /* Round I/O allocator to 4KB boundary */ pciauto_region_align(pci_io, 0x1000); pci_hose_write_config_byte(hose, dev, PCI_IO_BASE, (pci_io->bus_lower & 0x0000f000) >> 8); pci_hose_write_config_word(hose, dev, PCI_IO_BASE_UPPER16, (pci_io->bus_lower & 0xffff0000) >> 16); cmdstat |= PCI_COMMAND_IO; } /* Enable memory and I/O accesses, enable bus master */ pci_hose_write_config_dword(hose, dev, PCI_COMMAND, cmdstat | PCI_COMMAND_MASTER); } void pciauto_postscan_setup_bridge(struct pci_controller *hose, pci_dev_t dev, int sub_bus) { struct pci_region *pci_mem = hose->pci_mem; struct pci_region *pci_prefetch = hose->pci_prefetch; struct pci_region *pci_io = hose->pci_io; /* Configure bus number registers */ pci_hose_write_config_byte(hose, dev, PCI_SUBORDINATE_BUS, sub_bus - hose->first_busno); if (pci_mem) { /* Round memory allocator to 1MB boundary */ pciauto_region_align(pci_mem, 0x100000); pci_hose_write_config_word(hose, dev, PCI_MEMORY_LIMIT, (pci_mem->bus_lower-1) >> 16); } if (pci_prefetch) { /* Round memory allocator to 1MB boundary */ pciauto_region_align(pci_prefetch, 0x100000); pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_LIMIT, (pci_prefetch->bus_lower-1) >> 16); } if (pci_io) { /* Round I/O allocator to 4KB boundary */ pciauto_region_align(pci_io, 0x1000); pci_hose_write_config_byte(hose, dev, PCI_IO_LIMIT, ((pci_io->bus_lower-1) & 0x0000f000) >> 8); pci_hose_write_config_word(hose, dev, PCI_IO_LIMIT_UPPER16, ((pci_io->bus_lower-1) & 0xffff0000) >> 16); } } /* * */ void pciauto_config_init(struct pci_controller *hose) { int i; hose->pci_io = hose->pci_mem = NULL; for (i=0; iregion_count; i++) { switch(hose->regions[i].flags) { case PCI_REGION_IO: if (!hose->pci_io || hose->pci_io->size < hose->regions[i].size) hose->pci_io = hose->regions + i; break; case PCI_REGION_MEM: if (!hose->pci_mem || hose->pci_mem->size < hose->regions[i].size) hose->pci_mem = hose->regions + i; break; case (PCI_REGION_MEM | PCI_REGION_PREFETCH): if (!hose->pci_prefetch || hose->pci_prefetch->size < hose->regions[i].size) hose->pci_prefetch = hose->regions + i; break; } } if (hose->pci_mem) { pciauto_region_init(hose->pci_mem); DEBUGF("PCI Autoconfig: Bus Memory region: [%lx-%lx],\n" "\t\tPhysical Memory [%x-%x]\n", hose->pci_mem->bus_start, hose->pci_mem->bus_start + hose->pci_mem->size - 1, hose->pci_mem->phys_start, hose->pci_mem->phys_start + hose->pci_mem->size - 1); } if (hose->pci_prefetch) { pciauto_region_init(hose->pci_prefetch); DEBUGF("PCI Autoconfig: Bus Prefetchable Mem: [%lx-%lx],\n" "\t\tPhysical Memory [%x-%x]\n", hose->pci_prefetch->bus_start, hose->pci_prefetch->bus_start + hose->pci_prefetch->size - 1, hose->pci_prefetch->phys_start, hose->pci_prefetch->phys_start + hose->pci_prefetch->size - 1); } if (hose->pci_io) { pciauto_region_init(hose->pci_io); DEBUGF("PCI Autoconfig: Bus I/O region: [%lx-%lx],\n" "\t\tPhysical Memory: [%x-%x]\n", hose->pci_io->bus_start, hose->pci_io->bus_start + hose->pci_io->size - 1, hose->pci_io->phys_start, hose->pci_io->phys_start + hose->pci_io->size - 1); } } /* HJF: Changed this to return int. I think this is required * to get the correct result when scanning bridges */ int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev) { unsigned int sub_bus = PCI_BUS(dev); unsigned short class; unsigned char prg_iface; int n; pci_hose_read_config_word(hose, dev, PCI_CLASS_DEVICE, &class); switch(class) { case PCI_CLASS_BRIDGE_PCI: hose->current_busno++; pciauto_setup_device(hose, dev, 2, hose->pci_mem, hose->pci_prefetch, hose->pci_io); DEBUGF("PCI Autoconfig: Found P2P bridge, device %d\n", PCI_DEV(dev)); /* Passing in current_busno allows for sibling P2P bridges */ pciauto_prescan_setup_bridge(hose, dev, hose->current_busno); /* * need to figure out if this is a subordinate bridge on the bus * to be able to properly set the pri/sec/sub bridge registers. */ n = pci_hose_scan_bus(hose, hose->current_busno); /* figure out the deepest we've gone for this leg */ sub_bus = max(n, sub_bus); pciauto_postscan_setup_bridge(hose, dev, sub_bus); sub_bus = hose->current_busno; break; case PCI_CLASS_STORAGE_IDE: pci_hose_read_config_byte(hose, dev, PCI_CLASS_PROG, &prg_iface); if (!(prg_iface & PCIAUTO_IDE_MODE_MASK)) { DEBUGF("PCI Autoconfig: Skipping legacy mode IDE controller\n"); return sub_bus; } pciauto_setup_device(hose, dev, 6, hose->pci_mem, hose->pci_prefetch, hose->pci_io); break; case PCI_CLASS_BRIDGE_CARDBUS: /* just do a minimal setup of the bridge, let the OS take care of the rest */ pciauto_setup_device(hose, dev, 0, hose->pci_mem, hose->pci_prefetch, hose->pci_io); DEBUGF("PCI Autoconfig: Found P2CardBus bridge, device %d\n", PCI_DEV(dev)); hose->current_busno++; break; #ifdef CONFIG_MPC5200 case PCI_CLASS_BRIDGE_OTHER: DEBUGF("PCI Autoconfig: Skipping bridge device %d\n", PCI_DEV(dev)); break; #endif #ifdef CONFIG_MPC834X case PCI_CLASS_BRIDGE_OTHER: /* * The host/PCI bridge 1 seems broken in 8349 - it presents * itself as 'PCI_CLASS_BRIDGE_OTHER' and appears as an _agent_ * device claiming resources io/mem/irq.. we only allow for * the PIMMR window to be allocated (BAR0 - 1MB size) */ DEBUGF("PCI Autoconfig: Broken bridge found, only minimal config\n"); pciauto_setup_device(hose, dev, 0, hose->pci_mem, hose->pci_prefetch, hose->pci_io); break; #endif default: pciauto_setup_device(hose, dev, 6, hose->pci_mem, hose->pci_prefetch, hose->pci_io); break; } return sub_bus; } #endif /* CONFIG_PCI */