/* $NetBSD: pciconf.c,v 1.10 2001/09/03 03:46:26 thorpej Exp $ */ /* * Copyright 2001 Wasabi Systems, Inc. * All rights reserved. * * Written by Allen Briggs for Wasabi Systems, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed for the NetBSD Project by * Wasabi Systems, Inc. * 4. The name of Wasabi Systems, Inc. may not be used to endorse * or promote products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * Derived in part from code from PMON/2000 (http://pmon.groupbsd.org/). */ /* * To do: * - Perform all data structure allocation dynamically, don't have * statically-sized arrays ("oops, you lose because you have too * many slots filled!") * - Do this in 2 passes, with an MD hook to control the behavior: * (1) Configure the bus (possibly including expansion * ROMs. * (2) Another pass to disable expansion ROMs if they're * mapped (since you're not supposed to leave them * mapped when you're not using them). * This would facilitate MD code executing the expansion ROMs * if necessary (possibly with an x86 emulator) to configure * devices (e.g. VGA cards). * - Deal with "anything can be hot-plugged" -- i.e., carry configuration * information around & be able to reconfigure on the fly * - Deal with segments (See IA64 System Abstraction Layer) * - Deal with subtractive bridges (& non-spec positive/subtractive decode) * - Deal with ISA/VGA/VGA palette snooping * - Deal with device capabilities on bridges * - Worry about changing a bridge to/from transparency * From thorpej (05/25/01) * - Try to handle devices that are already configured (perhaps using that * as a hint to where we put other devices) */ #include "opt_pci.h" #include #include #include #include #include #include #include #include int pci_conf_debug = 0; #if !defined(MIN) #define MIN(a,b) (((a)<(b))?(a):(b)) #define MAX(a,b) (((a)>(b))?(a):(b)) #endif /* per-bus constants. */ #define MAX_CONF_DEV 32 /* Arbitrary */ #define MAX_CONF_MEM (3 * MAX_CONF_DEV) /* Avg. 3 per device -- Arb. */ #define MAX_CONF_IO (3 * MAX_CONF_DEV) /* Avg. 1 per device -- Arb. */ #define PCI_BUSNO_SPACING (1 << 5) struct _s_pciconf_bus_t; /* Forward declaration */ typedef struct _s_pciconf_dev_t { int ipin; int iline; int min_gnt; int max_lat; int enable; pcitag_t tag; pci_chipset_tag_t pc; struct _s_pciconf_bus_t *ppb; /* I am really a bridge */ } pciconf_dev_t; typedef struct _s_pciconf_win_t { pciconf_dev_t *dev; int reg; /* 0 for busses */ int align; int prefetch; u_int64_t size; u_int64_t address; } pciconf_win_t; typedef struct _s_pciconf_bus_t { int busno; int next_busno; int last_busno; int busno_spacing; int max_mingnt; int min_maxlat; int prefetch; int fast_b2b; int freq_66; int def_ltim; int max_ltim; int bandwidth_used; int swiz; int io_32bit; int pmem_64bit; int ndevs; pciconf_dev_t device[MAX_CONF_DEV]; /* These should be sorted in order of decreasing size */ int nmemwin; pciconf_win_t pcimemwin[MAX_CONF_MEM]; int niowin; pciconf_win_t pciiowin[MAX_CONF_IO]; bus_size_t io_total; bus_size_t mem_total; bus_size_t pmem_total; struct extent *ioext; struct extent *memext; struct extent *pmemext; pci_chipset_tag_t pc; struct _s_pciconf_bus_t *parent_bus; } pciconf_bus_t; static int probe_bus(pciconf_bus_t *); static void alloc_busno(pciconf_bus_t *, pciconf_bus_t *); static int pci_do_device_query(pciconf_bus_t *, pcitag_t, int, int, int); static int setup_iowins(pciconf_bus_t *); static int setup_memwins(pciconf_bus_t *); static int configure_bridge(pciconf_dev_t *); static int configure_bus(pciconf_bus_t *); static u_int64_t pci_allocate_range(struct extent *, u_int64_t, int); static pciconf_win_t *get_io_desc(pciconf_bus_t *, bus_size_t); static pciconf_win_t *get_mem_desc(pciconf_bus_t *, bus_size_t); static pciconf_bus_t *query_bus(pciconf_bus_t *, pciconf_dev_t *, int); static void print_tag(pci_chipset_tag_t, pcitag_t); static void print_tag(pci_chipset_tag_t pc, pcitag_t tag) { int bus, dev, func; pci_decompose_tag(pc, tag, &bus, &dev, &func); printf("PCI: bus %d, device %d, function %d: ", bus, dev, func); } /************************************************************************/ /************************************************************************/ /*********************** Bus probing routines ***********************/ /************************************************************************/ /************************************************************************/ static pciconf_win_t * get_io_desc(pciconf_bus_t *pb, bus_size_t size) { int i, n; n = pb->niowin; for (i=n; i > 0 && size > pb->pciiowin[i-1].size; i--) pb->pciiowin[i] = pb->pciiowin[i-1]; /* struct copy */ return &pb->pciiowin[i]; } static pciconf_win_t * get_mem_desc(pciconf_bus_t *pb, bus_size_t size) { int i, n; n = pb->nmemwin; for (i=n; i > 0 && size > pb->pcimemwin[i-1].size; i--) pb->pcimemwin[i] = pb->pcimemwin[i-1]; /* struct copy */ return &pb->pcimemwin[i]; } /* * Set up bus common stuff, then loop over devices & functions. * If we find something, call pci_do_device_query()). */ static int probe_bus(pciconf_bus_t *pb) { int device, maxdevs; #ifdef __PCI_BUS_DEVORDER char devs[32]; int i; #endif maxdevs = pci_bus_maxdevs(pb->pc, pb->busno); pb->ndevs = 0; pb->niowin = 0; pb->nmemwin = 0; pb->freq_66 = 1; pb->fast_b2b = 1; pb->prefetch = 1; pb->max_mingnt = 0; /* we are looking for the maximum */ pb->min_maxlat = 0x100; /* we are looking for the minimum */ pb->bandwidth_used = 0; #ifdef __PCI_BUS_DEVORDER pci_bus_devorder(pb->pc, pb->busno, devs); for (i=0; (device=devs[i]) < 32 && device >= 0; i++) { #else for (device=0; device < maxdevs; device++) { #endif pcitag_t tag; pcireg_t id, bhlcr; int function, nfunction; int confmode; tag = pci_make_tag(pb->pc, pb->busno, device, 0); if (pci_conf_debug) { print_tag(pb->pc, tag); } id = pci_conf_read(pb->pc, tag, PCI_ID_REG); if (pci_conf_debug) { printf("id=%x: Vendor=%x, Product=%x\n", id, PCI_VENDOR(id),PCI_PRODUCT(id)); } /* Invalid vendor ID value? */ if (PCI_VENDOR(id) == PCI_VENDOR_INVALID) continue; bhlcr = pci_conf_read(pb->pc, tag, PCI_BHLC_REG); nfunction = PCI_HDRTYPE_MULTIFN(bhlcr) ? 8 : 1; for (function = 0 ; function < nfunction ; function++) { tag = pci_make_tag(pb->pc, pb->busno, device, function); id = pci_conf_read(pb->pc, tag, PCI_ID_REG); if (PCI_VENDOR(id) == PCI_VENDOR_INVALID) continue; if (pb->ndevs+1 < MAX_CONF_DEV) { if (pci_conf_debug) { print_tag(pb->pc, tag); printf("Found dev 0x%04x 0x%04x -- " "really probing.\n", PCI_VENDOR(id), PCI_PRODUCT(id)); } #ifdef __HAVE_PCI_CONF_HOOK confmode = pci_conf_hook(pb->pc, pb->busno, device, function, id); if (confmode == 0) continue; #else /* * Don't enable expansion ROMS -- some cards * share address decoders between the EXPROM * and PCI memory space, and enabling the ROM * when not needed will cause all sorts of * lossage. */ confmode = PCI_CONF_ALL & ~PCI_CONF_MAP_ROM; #endif if (pci_do_device_query(pb, tag, device, function, confmode)) return -1; pb->ndevs++; } } } return 0; } static void alloc_busno(pciconf_bus_t *parent, pciconf_bus_t *pb) { pb->busno = parent->next_busno; if (parent->next_busno + parent->busno_spacing > parent->last_busno) panic("Too many PCI busses on bus %d", parent->busno); parent->next_busno = parent->next_busno + parent->busno_spacing; pb->next_busno = pb->busno+1; pb->busno_spacing = parent->busno_spacing >> 1; if (!pb->busno_spacing) panic("PCI busses nested too deep."); pb->last_busno = parent->next_busno - 1; } static pciconf_bus_t * query_bus(pciconf_bus_t *parent, pciconf_dev_t *pd, int dev) { pciconf_bus_t *pb; pcireg_t busreg, io, pmem; pciconf_win_t *pi, *pm; pb = malloc (sizeof (pciconf_bus_t), M_DEVBUF, M_NOWAIT); if (!pb) panic("Unable to allocate memory for PCI configuration."); pb->parent_bus = parent; alloc_busno(parent, pb); if (pci_conf_debug) printf("PCI bus bridge covers busses %d-%d\n", pb->busno, pb->last_busno); busreg = parent->busno << PCI_BRIDGE_BUS_PRIMARY_SHIFT; busreg |= pb->busno << PCI_BRIDGE_BUS_SECONDARY_SHIFT; busreg |= pb->last_busno << PCI_BRIDGE_BUS_SUBORDINATE_SHIFT; pci_conf_write(pb->pc, pd->tag, PCI_BRIDGE_BUS_REG, busreg); pb->swiz = parent->swiz + dev; pb->ioext = NULL; pb->memext = NULL; pb->pmemext = NULL; pb->pc = parent->pc; pb->io_total = pb->mem_total = pb->pmem_total = 0; pb->io_32bit = 0; if (parent->io_32bit) { io = pci_conf_read(pb->pc, pd->tag, PCI_BRIDGE_STATIO_REG); if (PCI_BRIDGE_IO_32BITS(io)) { pb->io_32bit = 1; } } pb->pmem_64bit = 0; if (parent->pmem_64bit) { pmem = pci_conf_read(pb->pc, pd->tag, PCI_BRIDGE_PREFETCHMEM_REG); if (PCI_BRIDGE_PREFETCHMEM_64BITS(pmem)) { pb->pmem_64bit = 1; } } if (probe_bus(pb)) { printf("Failed to probe bus %d\n", pb->busno); goto err; } if (pb->io_total > 0) { if (parent->niowin >= MAX_CONF_IO) { printf("pciconf: too many I/O windows\n"); goto err; } pb->io_total |= 0xfff; /* Round up */ pi = get_io_desc(parent, pb->io_total); pi->dev = pd; pi->reg = 0; pi->size = pb->io_total; pi->align = 0x1000; /* 4K alignment */ pi->prefetch = 0; parent->niowin++; parent->io_total += pb->io_total; } if (pb->mem_total > 0) { if (parent->nmemwin >= MAX_CONF_MEM) { printf("pciconf: too many MEM windows\n"); goto err; } pb->mem_total |= 0xfffff; /* Round up */ pm = get_mem_desc(parent, pb->mem_total); pm->dev = pd; pm->reg = 0; pm->size = pb->mem_total; pm->align = 0x100000; /* 1M alignment */ pm->prefetch = 0; parent->nmemwin++; parent->mem_total += pb->mem_total; } if (pb->pmem_total > 0) { if (parent->nmemwin >= MAX_CONF_MEM) { printf("pciconf: too many MEM windows\n"); goto err; } pb->pmem_total |= 0xfffff; /* Round up */ pm = get_mem_desc(parent, pb->pmem_total); pm->dev = pd; pm->reg = 0; pm->size = pb->pmem_total; pm->align = 0x100000; /* 1M alignment */ pm->prefetch = 1; parent->nmemwin++; parent->pmem_total += pb->pmem_total; } return pb; err: free(pb, M_DEVBUF); return NULL; } static int pci_do_device_query(pciconf_bus_t *pb, pcitag_t tag, int dev, int func, int mode) { pciconf_dev_t *pd; pciconf_win_t *pi, *pm; pcireg_t class, cmd, icr, bar, mask, bar64, mask64; u_int64_t size; int br, width; pd = &pb->device[pb->ndevs]; pd->pc = pb->pc; pd->tag = tag; pd->ppb = NULL; pd->enable = mode; class = pci_conf_read(pb->pc, tag, PCI_CLASS_REG); cmd = pci_conf_read(pb->pc, tag, PCI_COMMAND_STATUS_REG); if (PCI_CLASS(class) != PCI_CLASS_BRIDGE) { cmd &= ~(PCI_COMMAND_MASTER_ENABLE | PCI_COMMAND_IO_ENABLE | PCI_COMMAND_MEM_ENABLE); pci_conf_write(pb->pc, tag, PCI_COMMAND_STATUS_REG, cmd); } else if (pci_conf_debug) { print_tag(pb->pc, tag); printf("device is a bridge; not clearing enables\n"); } if ((cmd & PCI_STATUS_BACKTOBACK_SUPPORT) == 0) pb->fast_b2b = 0; if ((cmd & PCI_STATUS_66MHZ_SUPPORT) == 0) pb->freq_66 = 0; if ( (PCI_CLASS(class) == PCI_CLASS_BRIDGE) && (PCI_SUBCLASS(class) == PCI_SUBCLASS_BRIDGE_PCI)) { pd->ppb = query_bus(pb, pd, dev); if (pd->ppb == NULL) return -1; return 0; } icr = pci_conf_read(pb->pc, tag, PCI_INTERRUPT_REG); pd->ipin = PCI_INTERRUPT_PIN(icr); pd->iline = PCI_INTERRUPT_LINE(icr); pd->min_gnt = PCI_MIN_GNT(icr); pd->max_lat = PCI_MAX_LAT(icr); if (pd->iline || pd->ipin) { pci_conf_interrupt(pb->pc, pb->busno, dev, pd->ipin, pb->swiz, &pd->iline); icr &= ~(PCI_INTERRUPT_LINE_MASK << PCI_INTERRUPT_LINE_SHIFT); icr |= (pd->iline << PCI_INTERRUPT_LINE_SHIFT); pci_conf_write(pb->pc, tag, PCI_INTERRUPT_REG, icr); } if (pd->min_gnt != 0 || pd->max_lat != 0) { if (pd->min_gnt != 0 && pd->min_gnt > pb->max_mingnt) pb->max_mingnt = pd->min_gnt; if (pd->max_lat != 0 && pd->max_lat < pb->min_maxlat) pb->min_maxlat = pd->max_lat; pb->bandwidth_used += pd->min_gnt * 4000000 / (pd->min_gnt + pd->max_lat); } width = 4; for (br = PCI_MAPREG_START; br < PCI_MAPREG_END; br += width) { #if 0 /* XXX Should only ignore if IDE not in legacy mode? */ if (PCI_CLASS(class) == PCI_CLASS_MASS_STORAGE && PCI_SUBCLASS(class) == PCI_SUBCLASS_MASS_STORAGE_IDE) { break; } #endif bar = pci_conf_read(pb->pc, tag, br); pci_conf_write(pb->pc, tag, br, 0xffffffff); mask = pci_conf_read(pb->pc, tag, br); pci_conf_write(pb->pc, tag, br, bar); width = 4; if ( (mode & PCI_CONF_MAP_IO) && (PCI_MAPREG_TYPE(mask) == PCI_MAPREG_TYPE_IO)) { /* * Upper 16 bits must be one. Devices may hardwire * them to zero, though, per PCI 2.2, 6.2.5.1, p 203. */ mask |= 0xffff0000; size = PCI_MAPREG_IO_SIZE(mask); if (size == 0) { if (pci_conf_debug) { print_tag(pb->pc, tag); printf("I/O BAR 0x%x is void\n", br); } continue; } if (pb->niowin >= MAX_CONF_IO) { printf("pciconf: too many I/O windows\n"); return -1; } pi = get_io_desc(pb, size); pi->dev = pd; pi->reg = br; pi->size = (u_int64_t) size; pi->align = 4; pi->prefetch = 0; if (pci_conf_debug) { print_tag(pb->pc, tag); printf("Register 0x%x, I/O size %llu\n", br, pi->size); } pb->niowin++; pb->io_total += size; } else if ((mode & PCI_CONF_MAP_MEM) && (PCI_MAPREG_TYPE(mask) == PCI_MAPREG_TYPE_MEM)) { switch (PCI_MAPREG_MEM_TYPE(mask)) { case PCI_MAPREG_MEM_TYPE_32BIT: case PCI_MAPREG_MEM_TYPE_32BIT_1M: size = (u_int64_t) PCI_MAPREG_MEM_SIZE(mask); break; case PCI_MAPREG_MEM_TYPE_64BIT: bar64 = pci_conf_read(pb->pc, tag, br + 4); pci_conf_write(pb->pc, tag, br + 4, 0xffffffff); mask64 = pci_conf_read(pb->pc, tag, br + 4); pci_conf_write(pb->pc, tag, br + 4, bar64); size = (u_int64_t) PCI_MAPREG_MEM64_SIZE( (((u_int64_t) mask64) << 32) | mask); width = 8; continue; default: print_tag(pb->pc, tag); printf("reserved mapping type 0x%x\n", PCI_MAPREG_MEM_TYPE(mask)); continue; } if (size == 0) { if (pci_conf_debug) { print_tag(pb->pc, tag); printf("MEM%d BAR 0x%x is void\n", PCI_MAPREG_MEM_TYPE(mask) == PCI_MAPREG_MEM_TYPE_64BIT ? 64 : 32, br); } continue; } if (pb->nmemwin >= MAX_CONF_MEM) { printf("pciconf: too many memory windows\n"); return -1; } pm = get_mem_desc(pb, size); pm->dev = pd; pm->reg = br; pm->size = size; pm->align = 4; pm->prefetch = PCI_MAPREG_MEM_PREFETCHABLE(mask); if (pci_conf_debug) { print_tag(pb->pc, tag); printf("Register 0x%x, memory size %llu\n", br, pm->size); } pb->nmemwin++; if (pm->prefetch) { pb->pmem_total += size; } else { pb->mem_total += size; } } } if (mode & PCI_CONF_MAP_ROM) { bar = pci_conf_read(pb->pc, tag, PCI_MAPREG_ROM); pci_conf_write(pb->pc, tag, PCI_MAPREG_ROM, 0xfffffffe); mask = pci_conf_read(pb->pc, tag, PCI_MAPREG_ROM); pci_conf_write(pb->pc, tag, PCI_MAPREG_ROM, bar); if (mask != 0 && mask != 0xffffffff) { if (pb->nmemwin >= MAX_CONF_MEM) { printf("pciconf: too many memory windows\n"); return -1; } size = (u_int64_t) PCI_MAPREG_MEM_SIZE(mask); pm = get_mem_desc(pb, size); pm->dev = pd; pm->reg = PCI_MAPREG_ROM; pm->size = size; pm->align = 4; pm->prefetch = 1; if (pci_conf_debug) { print_tag(pb->pc, tag); printf("Expansion ROM memory size %llu\n", pm->size); } pb->nmemwin++; pb->pmem_total += size; } } else { /* Ensure ROM is disabled */ bar = pci_conf_read(pb->pc, tag, PCI_MAPREG_ROM); pci_conf_write(pb->pc, tag, PCI_MAPREG_ROM, 0xfffffffe); mask = pci_conf_read(pb->pc, tag, PCI_MAPREG_ROM); pci_conf_write(pb->pc, tag, PCI_MAPREG_ROM, bar & ~PCI_MAPREG_ROM_ENABLE); } return 0; } /************************************************************************/ /************************************************************************/ /******************** Bus configuration routines ********************/ /************************************************************************/ /************************************************************************/ static u_int64_t pci_allocate_range(struct extent *ex, u_int64_t amt, int align) { int r; u_long addr; r = extent_alloc(ex, amt, align, 0, EX_NOWAIT, &addr); if (r) { addr = (u_long) -1; printf("extent_alloc(%p, %llu, %d) returned %d\n", ex, amt, align, r); extent_print(ex); } return (pcireg_t) addr; } static int setup_iowins(pciconf_bus_t *pb) { pciconf_win_t *pi; pciconf_dev_t *pd; for (pi=pb->pciiowin; pi < &pb->pciiowin[pb->niowin] ; pi++) { if (pi->size == 0) continue; pd = pi->dev; pi->address = pci_allocate_range(pb->ioext, pi->size, pi->align); if (pi->address == -1) { print_tag(pd->pc, pd->tag); printf("Failed to allocate PCI I/O space (%llu req)\n", pi->size); return -1; } if (!pb->io_32bit && pi->address > 0xFFFF) { pi->address = 0; pd->enable = 0; } if (pd->ppb && pi->reg == 0) { pd->ppb->ioext = extent_create("pciconf", pi->address, pi->address + pi->size, M_DEVBUF, NULL, 0, EX_NOWAIT); if (pd->ppb->ioext == NULL) { print_tag(pd->pc, pd->tag); printf("Failed to alloc I/O ext. for bus %d\n", pd->ppb->busno); return -1; } continue; } pd->enable |= PCI_CONF_ENABLE_IO; if (pci_conf_debug) { print_tag(pd->pc, pd->tag); printf("Putting %llu I/O bytes @ %#llx (reg %x)\n", pi->size, pi->address, pi->reg); } pci_conf_write(pd->pc, pd->tag, pi->reg, PCI_MAPREG_IO_ADDR(pi->address) | PCI_MAPREG_TYPE_IO); } return 0; } static int setup_memwins(pciconf_bus_t *pb) { pciconf_win_t *pm; pciconf_dev_t *pd; pcireg_t base; struct extent *ex; for (pm=pb->pcimemwin; pm < &pb->pcimemwin[pb->nmemwin] ; pm++) { if (pm->size == 0) continue; pd = pm->dev; ex = (pm->prefetch) ? pb->pmemext : pb->memext; pm->address = pci_allocate_range(ex, pm->size, pm->align); if (pm->address == -1) { print_tag(pd->pc, pd->tag); printf( "Failed to allocate PCI memory space (%llu req)\n", pm->size); return -1; } if (pd->ppb && pm->reg == 0) { ex = extent_create("pciconf", pm->address, pm->address + pm->size, M_DEVBUF, NULL, 0, EX_NOWAIT); if (ex == NULL) { print_tag(pd->pc, pd->tag); printf("Failed to alloc MEM ext. for bus %d\n", pd->ppb->busno); return -1; } if (pm->prefetch) { pd->ppb->pmemext = ex; } else { pd->ppb->memext = ex; } continue; } if (pm->prefetch && !pb->pmem_64bit && pm->address > 0xFFFFFFFFULL) { pm->address = 0; pd->enable = 0; } else { pd->enable |= PCI_CONF_ENABLE_MEM; } if (pm->reg != PCI_MAPREG_ROM) { if (pci_conf_debug) { print_tag(pd->pc, pd->tag); printf( "Putting %llu MEM bytes @ %#llx (reg %x)\n", pm->size, pm->address, pm->reg); } base = pci_conf_read(pd->pc, pd->tag, pm->reg); base = PCI_MAPREG_MEM_ADDR(pm->address) | PCI_MAPREG_MEM_TYPE(base); pci_conf_write(pd->pc, pd->tag, pm->reg, base); if (PCI_MAPREG_MEM_TYPE(base) == PCI_MAPREG_MEM_TYPE_64BIT) { base = (pcireg_t) (PCI_MAPREG_MEM64_ADDR(pm->address) >> 32); pci_conf_write(pd->pc, pd->tag, pm->reg + 4, base); } } } for (pm=pb->pcimemwin; pm < &pb->pcimemwin[pb->nmemwin] ; pm++) { if (pm->reg == PCI_MAPREG_ROM && pm->address != -1) { pd = pm->dev; if (pci_conf_debug) { print_tag(pd->pc, pd->tag); printf( "Putting %llu ROM bytes @ %#llx (reg %x)\n", pm->size, pm->address, pm->reg); } base = (pcireg_t) (pm->address | PCI_MAPREG_ROM_ENABLE); pci_conf_write(pd->pc, pd->tag, pm->reg, base); } } return 0; } /* * Configure I/O, memory, and prefetcable memory spaces, then make * a call to configure_bus(). */ static int configure_bridge(pciconf_dev_t *pd) { unsigned long io_base, io_limit, mem_base, mem_limit; pciconf_bus_t *pb; pcireg_t io, iohigh, mem, cmd; int rv; pb = pd->ppb; /* Configure I/O base & limit*/ if (pb->ioext) { io_base = pb->ioext->ex_start; io_limit = pb->ioext->ex_end; } else { io_base = 0x1000; /* 4K */ io_limit = 0x0000; } if (pb->io_32bit) { iohigh = ((io_base >> 16) << PCI_BRIDGE_IOHIGH_BASE_SHIFT) | ((io_limit >> 16) << PCI_BRIDGE_IOHIGH_LIMIT_SHIFT); } else { if (io_limit > 0xFFFF) { printf("Bus %d bridge does not support 32-bit I/O. ", pb->busno); printf("Disabling I/O accesses\n"); io_base = 0x1000; /* 4K */ io_limit = 0x0000; } iohigh = 0; } io = pci_conf_read(pb->pc, pd->tag, PCI_BRIDGE_STATIO_REG) & (PCI_BRIDGE_STATIO_STATUS_MASK << PCI_BRIDGE_STATIO_STATUS_SHIFT); io |= (((io_base >> 8) & PCI_BRIDGE_STATIO_IOBASE_MASK) << PCI_BRIDGE_STATIO_IOBASE_SHIFT); io |= (((io_limit >> 8) & PCI_BRIDGE_STATIO_IOLIMIT_MASK) << PCI_BRIDGE_STATIO_IOLIMIT_SHIFT); pci_conf_write(pb->pc, pd->tag, PCI_BRIDGE_STATIO_REG, io); pci_conf_write(pb->pc, pd->tag, PCI_BRIDGE_IOHIGH_REG, iohigh); /* Configure mem base & limit */ if (pb->memext) { mem_base = pb->memext->ex_start; mem_limit = pb->memext->ex_end; } else { mem_base = 0x100000; /* 1M */ mem_limit = 0x000000; } if (mem_limit > 0xFFFFFFFFULL) { printf("Bus %d bridge MEM range out of range. ", pb->busno); printf("Disabling MEM accesses\n"); mem_base = 0x100000; /* 1M */ mem_limit = 0x000000; } mem = (((mem_base >> 20) & PCI_BRIDGE_MEMORY_BASE_MASK) << PCI_BRIDGE_MEMORY_BASE_SHIFT); mem |= (((mem_limit >> 20) & PCI_BRIDGE_MEMORY_LIMIT_MASK) << PCI_BRIDGE_MEMORY_LIMIT_SHIFT); pci_conf_write(pb->pc, pd->tag, PCI_BRIDGE_MEMORY_REG, mem); /* Configure prefetchable mem base & limit */ if (pb->pmemext) { mem_base = pb->pmemext->ex_start; mem_limit = pb->pmemext->ex_end; } else { mem_base = 0x100000; /* 1M */ mem_limit = 0x000000; } mem = pci_conf_read(pb->pc, pd->tag, PCI_BRIDGE_PREFETCHMEM_REG); if (!PCI_BRIDGE_PREFETCHMEM_64BITS(mem) && mem_limit > 0xFFFFFFFFULL) { printf("Bus %d bridge does not support 64-bit PMEM. ", pb->busno); printf("Disabling prefetchable-MEM accesses\n"); mem_base = 0x100000; /* 1M */ mem_limit = 0x000000; } mem = (((mem_base >> 20) & PCI_BRIDGE_PREFETCHMEM_BASE_MASK) << PCI_BRIDGE_PREFETCHMEM_BASE_SHIFT); mem |= (((mem_limit >> 20) & PCI_BRIDGE_PREFETCHMEM_LIMIT_MASK) << PCI_BRIDGE_PREFETCHMEM_LIMIT_SHIFT); pci_conf_write(pb->pc, pd->tag, PCI_BRIDGE_PREFETCHMEM_REG, mem); /* * XXX -- 64-bit systems need a lot more than just this... */ if (sizeof(u_long) > 4) { mem_base = (int64_t) mem_base >> 32; mem_limit = (int64_t) mem_limit >> 32; } pci_conf_write(pb->pc, pd->tag, PCI_BRIDGE_PREFETCHBASE32_REG, mem_base & 0xffffffff); pci_conf_write(pb->pc, pd->tag, PCI_BRIDGE_PREFETCHLIMIT32_REG, mem_limit & 0xffffffff); rv = configure_bus(pb); if (pb->ioext) extent_destroy(pb->ioext); if (pb->memext) extent_destroy(pb->memext); if (pb->pmemext) extent_destroy(pb->pmemext); if (rv == 0) { cmd = pci_conf_read(pd->pc, pd->tag, PCI_BRIDGE_CONTROL_REG); cmd &= PCI_BRIDGE_CONTROL_MASK; cmd |= (PCI_BRIDGE_CONTROL_PERE | PCI_BRIDGE_CONTROL_SERR) << PCI_BRIDGE_CONTROL_SHIFT; if (pb->fast_b2b) { cmd |= PCI_BRIDGE_CONTROL_SECFASTB2B << PCI_BRIDGE_CONTROL_SHIFT; } pci_conf_write(pd->pc, pd->tag, PCI_BRIDGE_CONTROL_REG, cmd); cmd = pci_conf_read(pd->pc, pd->tag, PCI_COMMAND_STATUS_REG); cmd |= PCI_COMMAND_IO_ENABLE | PCI_COMMAND_MEM_ENABLE; pci_conf_write(pd->pc, pd->tag, PCI_COMMAND_STATUS_REG, cmd); } return rv; } /* * Calculate latency values, allocate I/O and MEM segments, then set them * up. If a PCI-PCI bridge is found, configure the bridge separately, * which will cause a recursive call back here. */ static int configure_bus(pciconf_bus_t *pb) { pciconf_dev_t *pd; int def_ltim, max_ltim, band, bus_mhz; bus_mhz = pb->freq_66 ? 66 : 33; max_ltim = pb->max_mingnt * bus_mhz / 4; /* cvt to cycle count */ band = 40000000; /* 0.25us cycles/sec */ if (band < pb->bandwidth_used) { printf("PCI bus %d: Warning: Total bandwidth exceeded!?\n", pb->busno); def_ltim = -1; } else { def_ltim = (band - pb->bandwidth_used) / pb->ndevs; if (def_ltim > pb->min_maxlat) def_ltim = pb->min_maxlat; def_ltim = def_ltim * bus_mhz / 4; } def_ltim = (def_ltim + 7) & ~7; max_ltim = (max_ltim + 7) & ~7; pb->def_ltim = MIN( def_ltim, 255 ); pb->max_ltim = MIN( MAX(max_ltim, def_ltim ), 255 ); /* * Now we have what we need to initialize the devices. * It would probably be better if we could allocate all of these * for all busses at once, but "not right now". First, get a list * of free memory ranges from the m.d. system. */ if (setup_iowins(pb) || setup_memwins(pb)) { printf("PCI bus configuration failed: "); printf("unable to assign all I/O and memory ranges."); return -1; } /* * Configure the latency for the devices, and enable them. */ for (pd=pb->device ; pd < &pb->device[pb->ndevs] ; pd++) { pcireg_t cmd, class, misc; int ltim; if (pci_conf_debug) { print_tag(pd->pc, pd->tag); printf("Configuring device.\n"); } class = pci_conf_read(pd->pc, pd->tag, PCI_CLASS_REG); misc = pci_conf_read(pd->pc, pd->tag, PCI_BHLC_REG); cmd = pci_conf_read(pd->pc, pd->tag, PCI_COMMAND_STATUS_REG); cmd |= PCI_COMMAND_SERR_ENABLE | PCI_COMMAND_PARITY_ENABLE; if (pb->fast_b2b) cmd |= PCI_COMMAND_BACKTOBACK_ENABLE; if (PCI_CLASS(class) != PCI_CLASS_BRIDGE || PCI_SUBCLASS(class) != PCI_SUBCLASS_BRIDGE_PCI) { if (pd->enable & PCI_CONF_ENABLE_IO) cmd |= PCI_COMMAND_IO_ENABLE; if (pd->enable & PCI_CONF_ENABLE_MEM) cmd |= PCI_COMMAND_MEM_ENABLE; if (pd->enable & PCI_CONF_ENABLE_BM) cmd |= PCI_COMMAND_MASTER_ENABLE; ltim = pd->min_gnt * bus_mhz / 4; ltim = MIN (MAX (pb->def_ltim, ltim), pb->max_ltim); } else { cmd |= PCI_COMMAND_MASTER_ENABLE; ltim = MIN (pb->def_ltim, pb->max_ltim); } if (!(pd->enable)) { print_tag(pd->pc, pd->tag); printf("Disabled due to lack of resources.\n"); cmd &= ~(PCI_COMMAND_MASTER_ENABLE | PCI_COMMAND_IO_ENABLE | PCI_COMMAND_MEM_ENABLE); } pci_conf_write(pd->pc, pd->tag, PCI_COMMAND_STATUS_REG, cmd); misc = (misc & ~(PCI_LATTIMER_MASK << PCI_LATTIMER_SHIFT)) | ((ltim & 0xff) << PCI_LATTIMER_SHIFT); pci_conf_write(pd->pc, pd->tag, PCI_BHLC_REG, misc); if (pd->ppb) { if (configure_bridge(pd) < 0) return -1; continue; } } if (pci_conf_debug) { printf("PCI bus %d configured\n", pb->busno); } return 0; } /* * Let's configure the PCI bus. * This consists of basically scanning for all existing devices, * identifying their needs, and then making another pass over them * to set: * 1. I/O addresses * 2. Memory addresses (Prefetchable and not) * 3. PCI command register * 4. The latency part of the PCI BHLC (BIST (Built-In Self Test), * Header type, Latency timer, Cache line size) register * * The command register is set to enable fast back-to-back transactions * if the host bridge says it can handle it. We also configure * Master Enable, SERR enable, parity enable, and (if this is not a * PCI-PCI bridge) the I/O and Memory spaces. Apparently some devices * will not report some I/O space. * * The latency is computed to be a "fair share" of the bus bandwidth. * The bus bandwidth variable is initialized to the number of PCI cycles * in one second. The number of cycles taken for one transaction by each * device (MAX_LAT + MIN_GNT) is then subtracted from the bandwidth. * Care is taken to ensure that the latency timer won't be set such that * it would exceed the critical time for any device. * * This is complicated somewhat due to the presence of bridges. PCI-PCI * bridges are probed and configured recursively. */ int pci_configure_bus(pci_chipset_tag_t pc, struct extent *ioext, struct extent *memext, struct extent *pmemext) { pciconf_bus_t *pb; int rv; pb = malloc (sizeof (pciconf_bus_t), M_DEVBUF, M_NOWAIT); pb->busno = 0; pb->busno_spacing = PCI_BUSNO_SPACING; pb->next_busno = pb->busno + 1; pb->last_busno = 255; pb->parent_bus = NULL; pb->swiz = 0; pb->io_32bit = 1; pb->pmem_64bit = 0; pb->ioext = ioext; pb->memext = memext; if (pmemext == NULL) { pb->pmemext = memext; } else { pb->pmemext = pmemext; } pb->pc = pc; pb->io_total = pb->mem_total = pb->pmem_total = 0; rv = probe_bus(pb); if (rv == 0) { rv = configure_bus(pb); } /* * All done! */ free(pb, M_DEVBUF); return rv; }