| /* |
| * PCI autoconfiguration library |
| * |
| * Author: Matt Porter <mporter@mvista.com> |
| * |
| * 2001 (c) MontaVista, Software, Inc. This file is licensed under |
| * the terms of the GNU General Public License version 2. This program |
| * is licensed "as is" without any warranty of any kind, whether express |
| * or implied. |
| */ |
| |
| /* |
| * The CardBus support is very preliminary. Preallocating space is |
| * the way to go but will require some change in card services to |
| * make it useful. Eventually this will ensure that we can put |
| * multiple CB bridges behind multiple P2P bridges. For now, at |
| * least it ensures that we place the CB bridge BAR and assigned |
| * initial bus numbers. I definitely need to do something about |
| * the lack of 16-bit I/O support. -MDP |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/pci.h> |
| |
| #include <asm/pci-bridge.h> |
| |
| #define PCIAUTO_IDE_MODE_MASK 0x05 |
| |
| #undef DEBUG |
| |
| #ifdef DEBUG |
| #define DBG(x...) printk(x) |
| #else |
| #define DBG(x...) |
| #endif /* DEBUG */ |
| |
| static int pciauto_upper_iospc; |
| static int pciauto_upper_memspc; |
| |
| void __init pciauto_setup_bars(struct pci_controller *hose, |
| int current_bus, |
| int pci_devfn, |
| int bar_limit) |
| { |
| int bar_response, bar_size, bar_value; |
| int bar, addr_mask; |
| int * upper_limit; |
| int found_mem64 = 0; |
| |
| DBG("PCI Autoconfig: Found Bus %d, Device %d, Function %d\n", |
| current_bus, PCI_SLOT(pci_devfn), PCI_FUNC(pci_devfn) ); |
| |
| for (bar = PCI_BASE_ADDRESS_0; bar <= bar_limit; bar+=4) { |
| /* Tickle the BAR and get the response */ |
| early_write_config_dword(hose, |
| current_bus, |
| pci_devfn, |
| bar, |
| 0xffffffff); |
| early_read_config_dword(hose, |
| current_bus, |
| pci_devfn, |
| bar, |
| &bar_response); |
| |
| /* If BAR is not implemented go to the next BAR */ |
| if (!bar_response) |
| continue; |
| |
| /* Check the BAR type and set our address mask */ |
| if (bar_response & PCI_BASE_ADDRESS_SPACE) { |
| addr_mask = PCI_BASE_ADDRESS_IO_MASK; |
| upper_limit = &pciauto_upper_iospc; |
| DBG("PCI Autoconfig: BAR 0x%x, I/O, ", bar); |
| } else { |
| if ( (bar_response & PCI_BASE_ADDRESS_MEM_TYPE_MASK) == |
| PCI_BASE_ADDRESS_MEM_TYPE_64) |
| found_mem64 = 1; |
| |
| addr_mask = PCI_BASE_ADDRESS_MEM_MASK; |
| upper_limit = &pciauto_upper_memspc; |
| DBG("PCI Autoconfig: BAR 0x%x, Mem ", bar); |
| } |
| |
| /* Calculate requested size */ |
| bar_size = ~(bar_response & addr_mask) + 1; |
| |
| /* Allocate a base address */ |
| bar_value = (*upper_limit - bar_size) & ~(bar_size - 1); |
| |
| /* Write it out and update our limit */ |
| early_write_config_dword(hose, |
| current_bus, |
| pci_devfn, |
| bar, |
| bar_value); |
| |
| *upper_limit = 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; |
| early_write_config_dword(hose, |
| current_bus, |
| pci_devfn, |
| bar, |
| 0x00000000); |
| found_mem64 = 0; |
| } |
| |
| DBG("size=0x%x, address=0x%x\n", |
| bar_size, bar_value); |
| } |
| |
| } |
| |
| void __init pciauto_prescan_setup_bridge(struct pci_controller *hose, |
| int current_bus, |
| int pci_devfn, |
| int sub_bus, |
| int *iosave, |
| int *memsave) |
| { |
| /* Configure bus number registers */ |
| early_write_config_byte(hose, |
| current_bus, |
| pci_devfn, |
| PCI_PRIMARY_BUS, |
| current_bus); |
| early_write_config_byte(hose, |
| current_bus, |
| pci_devfn, |
| PCI_SECONDARY_BUS, |
| sub_bus + 1); |
| early_write_config_byte(hose, |
| current_bus, |
| pci_devfn, |
| PCI_SUBORDINATE_BUS, |
| 0xff); |
| |
| /* Round memory allocator to 1MB boundary */ |
| pciauto_upper_memspc &= ~(0x100000 - 1); |
| *memsave = pciauto_upper_memspc; |
| |
| /* Round I/O allocator to 4KB boundary */ |
| pciauto_upper_iospc &= ~(0x1000 - 1); |
| *iosave = pciauto_upper_iospc; |
| |
| /* Set up memory and I/O filter limits, assume 32-bit I/O space */ |
| early_write_config_word(hose, |
| current_bus, |
| pci_devfn, |
| PCI_MEMORY_LIMIT, |
| ((pciauto_upper_memspc - 1) & 0xfff00000) >> 16); |
| early_write_config_byte(hose, |
| current_bus, |
| pci_devfn, |
| PCI_IO_LIMIT, |
| ((pciauto_upper_iospc - 1) & 0x0000f000) >> 8); |
| early_write_config_word(hose, |
| current_bus, |
| pci_devfn, |
| PCI_IO_LIMIT_UPPER16, |
| ((pciauto_upper_iospc - 1) & 0xffff0000) >> 16); |
| |
| /* Zero upper 32 bits of prefetchable base/limit */ |
| early_write_config_dword(hose, |
| current_bus, |
| pci_devfn, |
| PCI_PREF_BASE_UPPER32, |
| 0); |
| early_write_config_dword(hose, |
| current_bus, |
| pci_devfn, |
| PCI_PREF_LIMIT_UPPER32, |
| 0); |
| } |
| |
| void __init pciauto_postscan_setup_bridge(struct pci_controller *hose, |
| int current_bus, |
| int pci_devfn, |
| int sub_bus, |
| int *iosave, |
| int *memsave) |
| { |
| int cmdstat; |
| |
| /* Configure bus number registers */ |
| early_write_config_byte(hose, |
| current_bus, |
| pci_devfn, |
| PCI_SUBORDINATE_BUS, |
| sub_bus); |
| |
| /* |
| * Round memory allocator to 1MB boundary. |
| * If no space used, allocate minimum. |
| */ |
| pciauto_upper_memspc &= ~(0x100000 - 1); |
| if (*memsave == pciauto_upper_memspc) |
| pciauto_upper_memspc -= 0x00100000; |
| |
| early_write_config_word(hose, |
| current_bus, |
| pci_devfn, |
| PCI_MEMORY_BASE, |
| pciauto_upper_memspc >> 16); |
| |
| /* Allocate 1MB for pre-fretch */ |
| early_write_config_word(hose, |
| current_bus, |
| pci_devfn, |
| PCI_PREF_MEMORY_LIMIT, |
| ((pciauto_upper_memspc - 1) & 0xfff00000) >> 16); |
| |
| pciauto_upper_memspc -= 0x100000; |
| |
| early_write_config_word(hose, |
| current_bus, |
| pci_devfn, |
| PCI_PREF_MEMORY_BASE, |
| pciauto_upper_memspc >> 16); |
| |
| /* Round I/O allocator to 4KB boundary */ |
| pciauto_upper_iospc &= ~(0x1000 - 1); |
| if (*iosave == pciauto_upper_iospc) |
| pciauto_upper_iospc -= 0x1000; |
| |
| early_write_config_byte(hose, |
| current_bus, |
| pci_devfn, |
| PCI_IO_BASE, |
| (pciauto_upper_iospc & 0x0000f000) >> 8); |
| early_write_config_word(hose, |
| current_bus, |
| pci_devfn, |
| PCI_IO_BASE_UPPER16, |
| pciauto_upper_iospc >> 16); |
| |
| /* Enable memory and I/O accesses, enable bus master */ |
| early_read_config_dword(hose, |
| current_bus, |
| pci_devfn, |
| PCI_COMMAND, |
| &cmdstat); |
| early_write_config_dword(hose, |
| current_bus, |
| pci_devfn, |
| PCI_COMMAND, |
| cmdstat | |
| PCI_COMMAND_IO | |
| PCI_COMMAND_MEMORY | |
| PCI_COMMAND_MASTER); |
| } |
| |
| void __init pciauto_prescan_setup_cardbus_bridge(struct pci_controller *hose, |
| int current_bus, |
| int pci_devfn, |
| int sub_bus, |
| int *iosave, |
| int *memsave) |
| { |
| /* Configure bus number registers */ |
| early_write_config_byte(hose, |
| current_bus, |
| pci_devfn, |
| PCI_PRIMARY_BUS, |
| current_bus); |
| early_write_config_byte(hose, |
| current_bus, |
| pci_devfn, |
| PCI_SECONDARY_BUS, |
| sub_bus + 1); |
| early_write_config_byte(hose, |
| current_bus, |
| pci_devfn, |
| PCI_SUBORDINATE_BUS, |
| 0xff); |
| |
| /* Round memory allocator to 4KB boundary */ |
| pciauto_upper_memspc &= ~(0x1000 - 1); |
| *memsave = pciauto_upper_memspc; |
| |
| /* Round I/O allocator to 4 byte boundary */ |
| pciauto_upper_iospc &= ~(0x4 - 1); |
| *iosave = pciauto_upper_iospc; |
| |
| /* Set up memory and I/O filter limits, assume 32-bit I/O space */ |
| early_write_config_dword(hose, |
| current_bus, |
| pci_devfn, |
| 0x20, |
| pciauto_upper_memspc - 1); |
| early_write_config_dword(hose, |
| current_bus, |
| pci_devfn, |
| 0x30, |
| pciauto_upper_iospc - 1); |
| } |
| |
| void __init pciauto_postscan_setup_cardbus_bridge(struct pci_controller *hose, |
| int current_bus, |
| int pci_devfn, |
| int sub_bus, |
| int *iosave, |
| int *memsave) |
| { |
| int cmdstat; |
| |
| /* |
| * Configure subordinate bus number. The PCI subsystem |
| * bus scan will renumber buses (reserving three additional |
| * for this PCI<->CardBus bridge for the case where a CardBus |
| * adapter contains a P2P or CB2CB bridge. |
| */ |
| early_write_config_byte(hose, |
| current_bus, |
| pci_devfn, |
| PCI_SUBORDINATE_BUS, |
| sub_bus); |
| |
| /* |
| * Reserve an additional 4MB for mem space and 16KB for |
| * I/O space. This should cover any additional space |
| * requirement of unusual CardBus devices with |
| * additional bridges that can consume more address space. |
| * |
| * Although pcmcia-cs currently will reprogram bridge |
| * windows, the goal is to add an option to leave them |
| * alone and use the bridge window ranges as the regions |
| * that are searched for free resources upon hot-insertion |
| * of a device. This will allow a PCI<->CardBus bridge |
| * configured by this routine to happily live behind a |
| * P2P bridge in a system. |
| */ |
| pciauto_upper_memspc -= 0x00400000; |
| pciauto_upper_iospc -= 0x00004000; |
| |
| /* Round memory allocator to 4KB boundary */ |
| pciauto_upper_memspc &= ~(0x1000 - 1); |
| |
| early_write_config_dword(hose, |
| current_bus, |
| pci_devfn, |
| 0x1c, |
| pciauto_upper_memspc); |
| |
| /* Round I/O allocator to 4 byte boundary */ |
| pciauto_upper_iospc &= ~(0x4 - 1); |
| early_write_config_dword(hose, |
| current_bus, |
| pci_devfn, |
| 0x2c, |
| pciauto_upper_iospc); |
| |
| /* Enable memory and I/O accesses, enable bus master */ |
| early_read_config_dword(hose, |
| current_bus, |
| pci_devfn, |
| PCI_COMMAND, |
| &cmdstat); |
| early_write_config_dword(hose, |
| current_bus, |
| pci_devfn, |
| PCI_COMMAND, |
| cmdstat | |
| PCI_COMMAND_IO | |
| PCI_COMMAND_MEMORY | |
| PCI_COMMAND_MASTER); |
| } |
| |
| int __init pciauto_bus_scan(struct pci_controller *hose, int current_bus) |
| { |
| int sub_bus, pci_devfn, pci_class, cmdstat, found_multi = 0; |
| unsigned short vid; |
| unsigned char header_type; |
| |
| /* |
| * Fetch our I/O and memory space upper boundaries used |
| * to allocated base addresses on this hose. |
| */ |
| if (current_bus == hose->first_busno) { |
| pciauto_upper_iospc = hose->io_space.end + 1; |
| pciauto_upper_memspc = hose->mem_space.end + 1; |
| } |
| |
| sub_bus = current_bus; |
| |
| for (pci_devfn = 0; pci_devfn < 0xff; pci_devfn++) { |
| /* Skip our host bridge */ |
| if ( (current_bus == hose->first_busno) && (pci_devfn == 0) ) |
| continue; |
| |
| if (PCI_FUNC(pci_devfn) && !found_multi) |
| continue; |
| |
| /* If config space read fails from this device, move on */ |
| if (early_read_config_byte(hose, |
| current_bus, |
| pci_devfn, |
| PCI_HEADER_TYPE, |
| &header_type)) |
| continue; |
| |
| if (!PCI_FUNC(pci_devfn)) |
| found_multi = header_type & 0x80; |
| |
| early_read_config_word(hose, |
| current_bus, |
| pci_devfn, |
| PCI_VENDOR_ID, |
| &vid); |
| |
| if (vid != 0xffff) { |
| early_read_config_dword(hose, |
| current_bus, |
| pci_devfn, |
| PCI_CLASS_REVISION, &pci_class); |
| if ( (pci_class >> 16) == PCI_CLASS_BRIDGE_PCI ) { |
| int iosave, memsave; |
| |
| DBG("PCI Autoconfig: Found P2P bridge, device %d\n", PCI_SLOT(pci_devfn)); |
| /* Allocate PCI I/O and/or memory space */ |
| pciauto_setup_bars(hose, |
| current_bus, |
| pci_devfn, |
| PCI_BASE_ADDRESS_1); |
| |
| pciauto_prescan_setup_bridge(hose, |
| current_bus, |
| pci_devfn, |
| sub_bus, |
| &iosave, |
| &memsave); |
| sub_bus = pciauto_bus_scan(hose, sub_bus+1); |
| pciauto_postscan_setup_bridge(hose, |
| current_bus, |
| pci_devfn, |
| sub_bus, |
| &iosave, |
| &memsave); |
| } else if ((pci_class >> 16) == PCI_CLASS_BRIDGE_CARDBUS) { |
| int iosave, memsave; |
| |
| DBG("PCI Autoconfig: Found CardBus bridge, device %d function %d\n", PCI_SLOT(pci_devfn), PCI_FUNC(pci_devfn)); |
| /* Place CardBus Socket/ExCA registers */ |
| pciauto_setup_bars(hose, |
| current_bus, |
| pci_devfn, |
| PCI_BASE_ADDRESS_0); |
| |
| pciauto_prescan_setup_cardbus_bridge(hose, |
| current_bus, |
| pci_devfn, |
| sub_bus, |
| &iosave, |
| &memsave); |
| sub_bus = pciauto_bus_scan(hose, sub_bus+1); |
| pciauto_postscan_setup_cardbus_bridge(hose, |
| current_bus, |
| pci_devfn, |
| sub_bus, |
| &iosave, |
| &memsave); |
| } else { |
| if ((pci_class >> 16) == PCI_CLASS_STORAGE_IDE) { |
| unsigned char prg_iface; |
| |
| early_read_config_byte(hose, |
| current_bus, |
| pci_devfn, |
| PCI_CLASS_PROG, |
| &prg_iface); |
| if (!(prg_iface & PCIAUTO_IDE_MODE_MASK)) { |
| DBG("PCI Autoconfig: Skipping legacy mode IDE controller\n"); |
| continue; |
| } |
| } |
| /* Allocate PCI I/O and/or memory space */ |
| pciauto_setup_bars(hose, |
| current_bus, |
| pci_devfn, |
| PCI_BASE_ADDRESS_5); |
| |
| /* |
| * Enable some standard settings |
| */ |
| early_read_config_dword(hose, |
| current_bus, |
| pci_devfn, |
| PCI_COMMAND, |
| &cmdstat); |
| early_write_config_dword(hose, |
| current_bus, |
| pci_devfn, |
| PCI_COMMAND, |
| cmdstat | |
| PCI_COMMAND_IO | |
| PCI_COMMAND_MEMORY | |
| PCI_COMMAND_MASTER); |
| early_write_config_byte(hose, |
| current_bus, |
| pci_devfn, |
| PCI_LATENCY_TIMER, |
| 0x80); |
| } |
| } |
| } |
| return sub_bus; |
| } |