/* * PCI autoconfiguration library * * Author: Matt Porter * * Copyright 2000, 2001 MontaVista Software Inc. * Copyright 2001 Bradley D. LaRonde * Copyright 2003 Paul Mundt * * 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. */ /* * Modified for MIPS by Jun Sun, jsun@mvista.com * * . Simplify the interface between pci_auto and the rest: a single function. * . Assign resources from low address to upper address. * . change most int to u32. * * Further modified to include it as mips generic code, ppopov@mvista.com. * * 2001-10-26 Bradley D. LaRonde * - Add a top_bus argument to the "early config" functions so that * they can set a fake parent bus pointer to convince the underlying * pci ops to use type 1 configuration for sub busses. * - Set bridge base and limit registers correctly. * - Align io and memory base properly before and after bridge setup. * - Don't fall through to pci_setup_bars for bridge. * - Reformat the debug output to look more like lspci's output. * * Cloned for SuperH by M. R. Brown, mrbrown@0xd6.org * * 2003-08-05 Paul Mundt * - Don't update the BAR values on systems that already have valid addresses * and don't want these updated for whatever reason, by way of a new config * option check. However, we still read in the old BAR values so that they * can still be reported through the debug output. */ #include #include #include #include #define DEBUG #ifdef DEBUG #define DBG(x...) printk(x) #else #define DBG(x...) #endif /* * These functions are used early on before PCI scanning is done * and all of the pci_dev and pci_bus structures have been created. */ static struct pci_dev *fake_pci_dev(struct pci_channel *hose, int top_bus, int busnr, int devfn) { static struct pci_dev dev; static struct pci_bus bus; dev.bus = &bus; dev.sysdata = hose; dev.devfn = devfn; bus.number = busnr; bus.ops = hose->pci_ops; if(busnr != top_bus) /* Fake a parent bus structure. */ bus.parent = &bus; else bus.parent = NULL; return &dev; } #define EARLY_PCI_OP(rw, size, type) \ int early_##rw##_config_##size(struct pci_channel *hose, \ int top_bus, int bus, int devfn, int offset, type value) \ { \ return pci_##rw##_config_##size( \ fake_pci_dev(hose, top_bus, bus, devfn), \ offset, value); \ } EARLY_PCI_OP(read, byte, u8 *) EARLY_PCI_OP(read, word, u16 *) EARLY_PCI_OP(read, dword, u32 *) EARLY_PCI_OP(write, byte, u8) EARLY_PCI_OP(write, word, u16) EARLY_PCI_OP(write, dword, u32) static struct resource *io_resource_inuse; static struct resource *mem_resource_inuse; static u32 pciauto_lower_iospc; static u32 pciauto_upper_iospc; static u32 pciauto_lower_memspc; static u32 pciauto_upper_memspc; static void __init pciauto_setup_bars(struct pci_channel *hose, int top_bus, int current_bus, int pci_devfn, int bar_limit) { u32 bar_response, bar_size, bar_value; u32 bar, addr_mask, bar_nr = 0; u32 * upper_limit; u32 * lower_limit; int found_mem64 = 0; for (bar = PCI_BASE_ADDRESS_0; bar <= bar_limit; bar+=4) { u32 bar_addr; /* Read the old BAR value */ early_read_config_dword(hose, top_bus, current_bus, pci_devfn, bar, &bar_addr); /* Tickle the BAR and get the response */ early_write_config_dword(hose, top_bus, current_bus, pci_devfn, bar, 0xffffffff); early_read_config_dword(hose, top_bus, current_bus, pci_devfn, bar, &bar_response); /* * Write the old BAR value back out, only update the BAR * if we implicitly want resources to be updated, which * is done by the generic code further down. -- PFM. */ early_write_config_dword(hose, top_bus, current_bus, pci_devfn, bar, bar_addr); /* If BAR is not implemented go to the next BAR */ if (!bar_response) continue; /* * Workaround for a BAR that doesn't use its upper word, * like the ALi 1535D+ PCI DC-97 Controller Modem (M5457). * bdl */ if (!(bar_response & 0xffff0000)) bar_response |= 0xffff0000; retry: /* 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; lower_limit = &pciauto_lower_iospc; DBG(" I/O"); } 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; lower_limit = &pciauto_lower_memspc; DBG(" Mem"); } /* Calculate requested size */ bar_size = ~(bar_response & addr_mask) + 1; /* Allocate a base address */ bar_value = ((*lower_limit - 1) & ~(bar_size - 1)) + bar_size; if ((bar_value + bar_size) > *upper_limit) { if (bar_response & PCI_BASE_ADDRESS_SPACE) { if (io_resource_inuse->child) { io_resource_inuse = io_resource_inuse->child; pciauto_lower_iospc = io_resource_inuse->start; pciauto_upper_iospc = io_resource_inuse->end + 1; goto retry; } } else { if (mem_resource_inuse->child) { mem_resource_inuse = mem_resource_inuse->child; pciauto_lower_memspc = mem_resource_inuse->start; pciauto_upper_memspc = mem_resource_inuse->end + 1; goto retry; } } DBG(" unavailable -- skipping, value %x size %x\n", bar_value, bar_size); continue; } #ifdef CONFIG_PCI_AUTO_UPDATE_RESOURCES /* Write it out and update our limit */ early_write_config_dword(hose, top_bus, current_bus, pci_devfn, bar, bar_value); #endif *lower_limit = bar_value + bar_size; /* * 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, top_bus, current_bus, pci_devfn, bar, 0x00000000); } DBG(" at 0x%.8x [size=0x%x]\n", bar_value, bar_size); bar_nr++; } } static void __init pciauto_prescan_setup_bridge(struct pci_channel *hose, int top_bus, int current_bus, int pci_devfn, int sub_bus) { /* Configure bus number registers */ early_write_config_byte(hose, top_bus, current_bus, pci_devfn, PCI_PRIMARY_BUS, current_bus); early_write_config_byte(hose, top_bus, current_bus, pci_devfn, PCI_SECONDARY_BUS, sub_bus + 1); early_write_config_byte(hose, top_bus, current_bus, pci_devfn, PCI_SUBORDINATE_BUS, 0xff); /* Align memory and I/O to 1MB and 4KB boundaries. */ pciauto_lower_memspc = (pciauto_lower_memspc + (0x100000 - 1)) & ~(0x100000 - 1); pciauto_lower_iospc = (pciauto_lower_iospc + (0x1000 - 1)) & ~(0x1000 - 1); /* Set base (lower limit) of address range behind bridge. */ early_write_config_word(hose, top_bus, current_bus, pci_devfn, PCI_MEMORY_BASE, pciauto_lower_memspc >> 16); early_write_config_byte(hose, top_bus, current_bus, pci_devfn, PCI_IO_BASE, (pciauto_lower_iospc & 0x0000f000) >> 8); early_write_config_word(hose, top_bus, current_bus, pci_devfn, PCI_IO_BASE_UPPER16, pciauto_lower_iospc >> 16); /* We don't support prefetchable memory for now, so disable */ early_write_config_word(hose, top_bus, current_bus, pci_devfn, PCI_PREF_MEMORY_BASE, 0); early_write_config_word(hose, top_bus, current_bus, pci_devfn, PCI_PREF_MEMORY_LIMIT, 0); } static void __init pciauto_postscan_setup_bridge(struct pci_channel *hose, int top_bus, int current_bus, int pci_devfn, int sub_bus) { u32 temp; /* * [jsun] we always bump up baselines a little, so that if there * nothing behind P2P bridge, we don't wind up overlapping IO/MEM * spaces. */ pciauto_lower_memspc += 1; pciauto_lower_iospc += 1; /* Configure bus number registers */ early_write_config_byte(hose, top_bus, current_bus, pci_devfn, PCI_SUBORDINATE_BUS, sub_bus); /* Set upper limit of address range behind bridge. */ early_write_config_word(hose, top_bus, current_bus, pci_devfn, PCI_MEMORY_LIMIT, pciauto_lower_memspc >> 16); early_write_config_byte(hose, top_bus, current_bus, pci_devfn, PCI_IO_LIMIT, (pciauto_lower_iospc & 0x0000f000) >> 8); early_write_config_word(hose, top_bus, current_bus, pci_devfn, PCI_IO_LIMIT_UPPER16, pciauto_lower_iospc >> 16); /* Align memory and I/O to 1MB and 4KB boundaries. */ pciauto_lower_memspc = (pciauto_lower_memspc + (0x100000 - 1)) & ~(0x100000 - 1); pciauto_lower_iospc = (pciauto_lower_iospc + (0x1000 - 1)) & ~(0x1000 - 1); /* Enable memory and I/O accesses, enable bus master */ early_read_config_dword(hose, top_bus, current_bus, pci_devfn, PCI_COMMAND, &temp); early_write_config_dword(hose, top_bus, current_bus, pci_devfn, PCI_COMMAND, temp | PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER); } static void __init pciauto_prescan_setup_cardbus_bridge(struct pci_channel *hose, int top_bus, int current_bus, int pci_devfn, int sub_bus) { /* Configure bus number registers */ early_write_config_byte(hose, top_bus, current_bus, pci_devfn, PCI_PRIMARY_BUS, current_bus); early_write_config_byte(hose, top_bus, current_bus, pci_devfn, PCI_SECONDARY_BUS, sub_bus + 1); early_write_config_byte(hose, top_bus, current_bus, pci_devfn, PCI_SUBORDINATE_BUS, 0xff); /* Align memory and I/O to 4KB and 4 byte boundaries. */ pciauto_lower_memspc = (pciauto_lower_memspc + (0x1000 - 1)) & ~(0x1000 - 1); pciauto_lower_iospc = (pciauto_lower_iospc + (0x4 - 1)) & ~(0x4 - 1); early_write_config_dword(hose, top_bus, current_bus, pci_devfn, PCI_CB_MEMORY_BASE_0, pciauto_lower_memspc); early_write_config_dword(hose, top_bus, current_bus, pci_devfn, PCI_CB_IO_BASE_0, pciauto_lower_iospc); } static void __init pciauto_postscan_setup_cardbus_bridge(struct pci_channel *hose, int top_bus, int current_bus, int pci_devfn, int sub_bus) { u32 temp; #if !defined(CONFIG_SH_HS7751RVOIP) && !defined(CONFIG_SH_RTS7751R2D) && !defined(CONFIG_SH_R7780RP) /* * [jsun] we always bump up baselines a little, so that if there * nothing behind P2P bridge, we don't wind up overlapping IO/MEM * spaces. */ pciauto_lower_memspc += 1; pciauto_lower_iospc += 1; #endif /* * 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, top_bus, 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. */ #if defined(CONFIG_SH_HS7751RVOIP) || defined(CONFIG_SH_RTS7751R2D) || defined(CONFIG_SH_R7780RP) pciauto_lower_memspc += 0x00400000; pciauto_lower_iospc += 0x00004000; #endif /* Align memory and I/O to 4KB and 4 byte boundaries. */ pciauto_lower_memspc = (pciauto_lower_memspc + (0x1000 - 1)) & ~(0x1000 - 1); pciauto_lower_iospc = (pciauto_lower_iospc + (0x4 - 1)) & ~(0x4 - 1); /* Set up memory and I/O filter limits, assume 32-bit I/O space */ early_write_config_dword(hose, top_bus, current_bus, pci_devfn, PCI_CB_MEMORY_LIMIT_0, pciauto_lower_memspc - 1); early_write_config_dword(hose, top_bus, current_bus, pci_devfn, PCI_CB_IO_LIMIT_0, pciauto_lower_iospc - 1); /* Enable memory and I/O accesses, enable bus master */ early_read_config_dword(hose, top_bus, current_bus, pci_devfn, PCI_COMMAND, &temp); early_write_config_dword(hose, top_bus, current_bus, pci_devfn, PCI_COMMAND, temp | PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER); } #define PCIAUTO_IDE_MODE_MASK 0x05 static int __init pciauto_bus_scan(struct pci_channel *hose, int top_bus, int current_bus) { int sub_bus; u32 pci_devfn, pci_class, cmdstat, found_multi=0; unsigned short vid, did; unsigned char header_type; int devfn_start = 0; int devfn_stop = 0xff; sub_bus = current_bus; if (hose->first_devfn) devfn_start = hose->first_devfn; if (hose->last_devfn) devfn_stop = hose->last_devfn; for (pci_devfn=devfn_start; pci_devfn> 16, vid, did); if (pci_class & 0xff) DBG(" (rev %.2x)", pci_class & 0xff); DBG("\n"); if ((pci_class >> 16) == PCI_CLASS_BRIDGE_PCI) { DBG(" Bridge: primary=%.2x, secondary=%.2x\n", current_bus, sub_bus + 1); #if defined(CONFIG_SH_HS7751RVOIP) || defined(CONFIG_SH_RTS7751R2D) || defined(CONFIG_SH_R7780RP) pciauto_setup_bars(hose, top_bus, current_bus, pci_devfn, PCI_BASE_ADDRESS_1); #endif pciauto_prescan_setup_bridge(hose, top_bus, current_bus, pci_devfn, sub_bus); DBG("Scanning sub bus %.2x, I/O 0x%.8x, Mem 0x%.8x\n", sub_bus + 1, pciauto_lower_iospc, pciauto_lower_memspc); sub_bus = pciauto_bus_scan(hose, top_bus, sub_bus+1); DBG("Back to bus %.2x\n", current_bus); pciauto_postscan_setup_bridge(hose, top_bus, current_bus, pci_devfn, sub_bus); continue; } else if ((pci_class >> 16) == PCI_CLASS_BRIDGE_CARDBUS) { DBG(" CARDBUS Bridge: primary=%.2x, secondary=%.2x\n", current_bus, sub_bus + 1); 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, top_bus, current_bus, pci_devfn, PCI_BASE_ADDRESS_0); pciauto_prescan_setup_cardbus_bridge(hose, top_bus, current_bus, pci_devfn, sub_bus); DBG("Scanning sub bus %.2x, I/O 0x%.8x, Mem 0x%.8x\n", sub_bus + 1, pciauto_lower_iospc, pciauto_lower_memspc); sub_bus = pciauto_bus_scan(hose, top_bus, sub_bus+1); DBG("Back to bus %.2x, sub_bus is %x\n", current_bus, sub_bus); pciauto_postscan_setup_cardbus_bridge(hose, top_bus, current_bus, pci_devfn, sub_bus); continue; } else if ((pci_class >> 16) == PCI_CLASS_STORAGE_IDE) { unsigned char prg_iface; early_read_config_byte(hose, top_bus, current_bus, pci_devfn, PCI_CLASS_PROG, &prg_iface); if (!(prg_iface & PCIAUTO_IDE_MODE_MASK)) { DBG("Skipping legacy mode IDE controller\n"); continue; } } /* * Found a peripheral, enable some standard * settings */ early_read_config_dword(hose, top_bus, current_bus, pci_devfn, PCI_COMMAND, &cmdstat); early_write_config_dword(hose, top_bus, current_bus, pci_devfn, PCI_COMMAND, cmdstat | PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER); #if !defined(CONFIG_SH_HS7751RVOIP) && !defined(CONFIG_SH_RTS7751R2D) early_write_config_byte(hose, top_bus, current_bus, pci_devfn, PCI_LATENCY_TIMER, 0x80); #endif /* Allocate PCI I/O and/or memory space */ pciauto_setup_bars(hose, top_bus, current_bus, pci_devfn, PCI_BASE_ADDRESS_5); } return sub_bus; } int __init pciauto_assign_resources(int busno, struct pci_channel *hose) { /* setup resource limits */ io_resource_inuse = hose->io_resource; mem_resource_inuse = hose->mem_resource; pciauto_lower_iospc = io_resource_inuse->start; pciauto_upper_iospc = io_resource_inuse->end + 1; pciauto_lower_memspc = mem_resource_inuse->start; pciauto_upper_memspc = mem_resource_inuse->end + 1; DBG("Autoconfig PCI channel 0x%p\n", hose); DBG("Scanning bus %.2x, I/O 0x%.8x:0x%.8x, Mem 0x%.8x:0x%.8x\n", busno, pciauto_lower_iospc, pciauto_upper_iospc, pciauto_lower_memspc, pciauto_upper_memspc); return pciauto_bus_scan(hose, busno, busno); }