/* * PCI autoconfiguration library * * Author: Matt Porter * * Copyright 2000 MontaVista Software Inc. * * SPDX-License-Identifier: GPL-2.0+ */ #include #include #include #include /* the user can define CONFIG_SYS_PCI_CACHE_LINE_SIZE to avoid problems */ #ifndef CONFIG_SYS_PCI_CACHE_LINE_SIZE #define CONFIG_SYS_PCI_CACHE_LINE_SIZE 8 #endif void dm_pciauto_setup_device(struct udevice *dev, int bars_num, struct pci_region *mem, struct pci_region *prefetch, struct pci_region *io, bool enum_only) { u32 bar_response; pci_size_t bar_size; u16 cmdstat = 0; int bar, bar_nr = 0; u8 header_type; int rom_addr; pci_addr_t bar_value; struct pci_region *bar_res = NULL; int found_mem64 = 0; u16 class; dm_pci_read_config16(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 */ if (!enum_only) dm_pci_write_config32(dev, bar, 0xffffffff); dm_pci_read_config32(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; if (!enum_only) bar_res = io; debug("PCI Autoconfig: BAR %d, I/O, size=0x%llx, ", bar_nr, (unsigned long long)bar_size); } else { if ((bar_response & PCI_BASE_ADDRESS_MEM_TYPE_MASK) == PCI_BASE_ADDRESS_MEM_TYPE_64) { u32 bar_response_upper; u64 bar64; if (!enum_only) { dm_pci_write_config32(dev, bar + 4, 0xffffffff); } dm_pci_read_config32(dev, bar + 4, &bar_response_upper); bar64 = ((u64)bar_response_upper << 32) | bar_response; bar_size = ~(bar64 & PCI_BASE_ADDRESS_MEM_MASK) + 1; if (!enum_only) found_mem64 = 1; } else { bar_size = (u32)(~(bar_response & PCI_BASE_ADDRESS_MEM_MASK) + 1); } if (!enum_only) { if (prefetch && (bar_response & PCI_BASE_ADDRESS_MEM_PREFETCH)) { bar_res = prefetch; } else { bar_res = mem; } } debug("PCI Autoconfig: BAR %d, %s, size=0x%llx, ", bar_nr, bar_res == prefetch ? "Prf" : "Mem", (unsigned long long)bar_size); } if (!enum_only && pciauto_region_allocate(bar_res, bar_size, &bar_value) == 0) { /* Write it out and update our limit */ dm_pci_write_config32(dev, bar, (u32)bar_value); if (found_mem64) { bar += 4; #ifdef CONFIG_SYS_PCI_64BIT dm_pci_write_config32(dev, bar, (u32)(bar_value >> 32)); #else /* * 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. */ dm_pci_write_config32(dev, bar, 0x00000000); #endif } } cmdstat |= (bar_response & PCI_BASE_ADDRESS_SPACE) ? PCI_COMMAND_IO : PCI_COMMAND_MEMORY; debug("\n"); bar_nr++; } if (!enum_only) { /* Configure the expansion ROM address */ dm_pci_read_config8(dev, PCI_HEADER_TYPE, &header_type); header_type &= 0x7f; if (header_type != PCI_HEADER_TYPE_CARDBUS) { rom_addr = (header_type == PCI_HEADER_TYPE_NORMAL) ? PCI_ROM_ADDRESS : PCI_ROM_ADDRESS1; dm_pci_write_config32(dev, rom_addr, 0xfffffffe); dm_pci_read_config32(dev, rom_addr, &bar_response); if (bar_response) { bar_size = -(bar_response & ~1); debug("PCI Autoconfig: ROM, size=%#x, ", (unsigned int)bar_size); if (pciauto_region_allocate(mem, bar_size, &bar_value) == 0) { dm_pci_write_config32(dev, rom_addr, bar_value); } cmdstat |= PCI_COMMAND_MEMORY; debug("\n"); } } } /* PCI_COMMAND_IO must be set for VGA device */ dm_pci_read_config16(dev, PCI_CLASS_DEVICE, &class); if (class == PCI_CLASS_DISPLAY_VGA) cmdstat |= PCI_COMMAND_IO; dm_pci_write_config16(dev, PCI_COMMAND, cmdstat); dm_pci_write_config8(dev, PCI_CACHE_LINE_SIZE, CONFIG_SYS_PCI_CACHE_LINE_SIZE); dm_pci_write_config8(dev, PCI_LATENCY_TIMER, 0x80); } void dm_pciauto_prescan_setup_bridge(struct udevice *dev, int sub_bus) { struct pci_region *pci_mem; struct pci_region *pci_prefetch; struct pci_region *pci_io; u16 cmdstat, prefechable_64; struct udevice *ctlr = pci_get_controller(dev); struct pci_controller *ctlr_hose = dev_get_uclass_priv(ctlr); pci_mem = ctlr_hose->pci_mem; pci_prefetch = ctlr_hose->pci_prefetch; pci_io = ctlr_hose->pci_io; dm_pci_read_config16(dev, PCI_COMMAND, &cmdstat); dm_pci_read_config16(dev, PCI_PREF_MEMORY_BASE, &prefechable_64); prefechable_64 &= PCI_PREF_RANGE_TYPE_MASK; /* Configure bus number registers */ dm_pci_write_config8(dev, PCI_PRIMARY_BUS, PCI_BUS(dm_pci_get_bdf(dev))); dm_pci_write_config8(dev, PCI_SECONDARY_BUS, sub_bus); dm_pci_write_config8(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 */ dm_pci_write_config16(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 */ dm_pci_write_config16(dev, PCI_PREF_MEMORY_BASE, (pci_prefetch->bus_lower & 0xfff00000) >> 16); if (prefechable_64 == PCI_PREF_RANGE_TYPE_64) #ifdef CONFIG_SYS_PCI_64BIT dm_pci_write_config32(dev, PCI_PREF_BASE_UPPER32, pci_prefetch->bus_lower >> 32); #else dm_pci_write_config32(dev, PCI_PREF_BASE_UPPER32, 0x0); #endif cmdstat |= PCI_COMMAND_MEMORY; } else { /* We don't support prefetchable memory for now, so disable */ dm_pci_write_config16(dev, PCI_PREF_MEMORY_BASE, 0x1000); dm_pci_write_config16(dev, PCI_PREF_MEMORY_LIMIT, 0x0); if (prefechable_64 == PCI_PREF_RANGE_TYPE_64) { dm_pci_write_config16(dev, PCI_PREF_BASE_UPPER32, 0x0); dm_pci_write_config16(dev, PCI_PREF_LIMIT_UPPER32, 0x0); } } if (pci_io) { /* Round I/O allocator to 4KB boundary */ pciauto_region_align(pci_io, 0x1000); dm_pci_write_config8(dev, PCI_IO_BASE, (pci_io->bus_lower & 0x0000f000) >> 8); dm_pci_write_config16(dev, PCI_IO_BASE_UPPER16, (pci_io->bus_lower & 0xffff0000) >> 16); cmdstat |= PCI_COMMAND_IO; } /* Enable memory and I/O accesses, enable bus master */ dm_pci_write_config16(dev, PCI_COMMAND, cmdstat | PCI_COMMAND_MASTER); } void dm_pciauto_postscan_setup_bridge(struct udevice *dev, int sub_bus) { struct pci_region *pci_mem; struct pci_region *pci_prefetch; struct pci_region *pci_io; struct udevice *ctlr = pci_get_controller(dev); struct pci_controller *ctlr_hose = dev_get_uclass_priv(ctlr); pci_mem = ctlr_hose->pci_mem; pci_prefetch = ctlr_hose->pci_prefetch; pci_io = ctlr_hose->pci_io; /* Configure bus number registers */ dm_pci_write_config8(dev, PCI_SUBORDINATE_BUS, sub_bus); if (pci_mem) { /* Round memory allocator to 1MB boundary */ pciauto_region_align(pci_mem, 0x100000); dm_pci_write_config16(dev, PCI_MEMORY_LIMIT, (pci_mem->bus_lower - 1) >> 16); } if (pci_prefetch) { u16 prefechable_64; dm_pci_read_config16(dev, PCI_PREF_MEMORY_LIMIT, &prefechable_64); prefechable_64 &= PCI_PREF_RANGE_TYPE_MASK; /* Round memory allocator to 1MB boundary */ pciauto_region_align(pci_prefetch, 0x100000); dm_pci_write_config16(dev, PCI_PREF_MEMORY_LIMIT, (pci_prefetch->bus_lower - 1) >> 16); if (prefechable_64 == PCI_PREF_RANGE_TYPE_64) #ifdef CONFIG_SYS_PCI_64BIT dm_pci_write_config32(dev, PCI_PREF_LIMIT_UPPER32, (pci_prefetch->bus_lower - 1) >> 32); #else dm_pci_write_config32(dev, PCI_PREF_LIMIT_UPPER32, 0x0); #endif } if (pci_io) { /* Round I/O allocator to 4KB boundary */ pciauto_region_align(pci_io, 0x1000); dm_pci_write_config8(dev, PCI_IO_LIMIT, ((pci_io->bus_lower - 1) & 0x0000f000) >> 8); dm_pci_write_config16(dev, PCI_IO_LIMIT_UPPER16, ((pci_io->bus_lower - 1) & 0xffff0000) >> 16); } } /* * HJF: Changed this to return int. I think this is required * to get the correct result when scanning bridges */ int dm_pciauto_config_device(struct udevice *dev) { struct pci_region *pci_mem; struct pci_region *pci_prefetch; struct pci_region *pci_io; unsigned int sub_bus = PCI_BUS(dm_pci_get_bdf(dev)); unsigned short class; bool enum_only = false; struct udevice *ctlr = pci_get_controller(dev); struct pci_controller *ctlr_hose = dev_get_uclass_priv(ctlr); int n; #ifdef CONFIG_PCI_ENUM_ONLY enum_only = true; #endif pci_mem = ctlr_hose->pci_mem; pci_prefetch = ctlr_hose->pci_prefetch; pci_io = ctlr_hose->pci_io; dm_pci_read_config16(dev, PCI_CLASS_DEVICE, &class); switch (class) { case PCI_CLASS_BRIDGE_PCI: debug("PCI Autoconfig: Found P2P bridge, device %d\n", PCI_DEV(dm_pci_get_bdf(dev))); dm_pciauto_setup_device(dev, 2, pci_mem, pci_prefetch, pci_io, enum_only); n = dm_pci_hose_probe_bus(dev); if (n < 0) return n; sub_bus = (unsigned int)n; break; case PCI_CLASS_BRIDGE_CARDBUS: /* * just do a minimal setup of the bridge, * let the OS take care of the rest */ dm_pciauto_setup_device(dev, 0, pci_mem, pci_prefetch, pci_io, enum_only); debug("PCI Autoconfig: Found P2CardBus bridge, device %d\n", PCI_DEV(dm_pci_get_bdf(dev))); break; #if defined(CONFIG_PCIAUTO_SKIP_HOST_BRIDGE) case PCI_CLASS_BRIDGE_OTHER: debug("PCI Autoconfig: Skipping bridge device %d\n", PCI_DEV(dm_pci_get_bdf(dev))); break; #endif #if defined(CONFIG_MPC834x) && !defined(CONFIG_VME8349) 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) */ debug("PCI Autoconfig: Broken bridge found, only minimal config\n"); dm_pciauto_setup_device(dev, 0, hose->pci_mem, hose->pci_prefetch, hose->pci_io, enum_only); break; #endif case PCI_CLASS_PROCESSOR_POWERPC: /* an agent or end-point */ debug("PCI AutoConfig: Found PowerPC device\n"); /* fall through */ default: dm_pciauto_setup_device(dev, 6, pci_mem, pci_prefetch, pci_io, enum_only); break; } return sub_bus; }