/* $Id: pci.c,v 1.6 2000/01/29 00:12:05 grundler Exp $ * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 1997, 1998 Ralf Baechle * Copyright (C) 1999 SuSE GmbH * Copyright (C) 1999-2001 Hewlett-Packard Company * Copyright (C) 1999-2001 Grant Grundler */ #include #include #include #include #include #include #include #include #include #include #include /* for L1_CACHE_BYTES */ #include #define DEBUG_RESOURCES 0 #define DEBUG_CONFIG 0 #if DEBUG_CONFIG # define DBGC(x...) printk(KERN_DEBUG x) #else # define DBGC(x...) #endif #if DEBUG_RESOURCES #define DBG_RES(x...) printk(KERN_DEBUG x) #else #define DBG_RES(x...) #endif /* To be used as: mdelay(pci_post_reset_delay); * * post_reset is the time the kernel should stall to prevent anyone from * accessing the PCI bus once #RESET is de-asserted. * PCI spec somewhere says 1 second but with multi-PCI bus systems, * this makes the boot time much longer than necessary. * 20ms seems to work for all the HP PCI implementations to date. * * #define pci_post_reset_delay 50 */ struct pci_port_ops *pci_port __read_mostly; struct pci_bios_ops *pci_bios __read_mostly; static int pci_hba_count __read_mostly; /* parisc_pci_hba used by pci_port->in/out() ops to lookup bus data. */ #define PCI_HBA_MAX 32 static struct pci_hba_data *parisc_pci_hba[PCI_HBA_MAX] __read_mostly; /******************************************************************** ** ** I/O port space support ** *********************************************************************/ /* EISA port numbers and PCI port numbers share the same interface. Some * machines have both EISA and PCI adapters installed. Rather than turn * pci_port into an array, we reserve bus 0 for EISA and call the EISA * routines if the access is to a port on bus 0. We don't want to fix * EISA and ISA drivers which assume port space is <= 0xffff. */ #ifdef CONFIG_EISA #define EISA_IN(size) if (EISA_bus && (b == 0)) return eisa_in##size(addr) #define EISA_OUT(size) if (EISA_bus && (b == 0)) return eisa_out##size(d, addr) #else #define EISA_IN(size) #define EISA_OUT(size) #endif #define PCI_PORT_IN(type, size) \ u##size in##type (int addr) \ { \ int b = PCI_PORT_HBA(addr); \ EISA_IN(size); \ if (!parisc_pci_hba[b]) return (u##size) -1; \ return pci_port->in##type(parisc_pci_hba[b], PCI_PORT_ADDR(addr)); \ } \ EXPORT_SYMBOL(in##type); PCI_PORT_IN(b, 8) PCI_PORT_IN(w, 16) PCI_PORT_IN(l, 32) #define PCI_PORT_OUT(type, size) \ void out##type (u##size d, int addr) \ { \ int b = PCI_PORT_HBA(addr); \ EISA_OUT(size); \ if (!parisc_pci_hba[b]) return; \ pci_port->out##type(parisc_pci_hba[b], PCI_PORT_ADDR(addr), d); \ } \ EXPORT_SYMBOL(out##type); PCI_PORT_OUT(b, 8) PCI_PORT_OUT(w, 16) PCI_PORT_OUT(l, 32) /* * BIOS32 replacement. */ static int __init pcibios_init(void) { if (!pci_bios) return -1; if (pci_bios->init) { pci_bios->init(); } else { printk(KERN_WARNING "pci_bios != NULL but init() is!\n"); } return 0; } /* Called from pci_do_scan_bus() *after* walking a bus but before walking PPBs. */ void pcibios_fixup_bus(struct pci_bus *bus) { if (pci_bios->fixup_bus) { pci_bios->fixup_bus(bus); } else { printk(KERN_WARNING "pci_bios != NULL but fixup_bus() is!\n"); } } char *pcibios_setup(char *str) { return str; } /* * Called by pci_set_master() - a driver interface. * * Legacy PDC guarantees to set: * Map Memory BAR's into PA IO space. * Map Expansion ROM BAR into one common PA IO space per bus. * Map IO BAR's into PCI IO space. * Command (see below) * Cache Line Size * Latency Timer * Interrupt Line * PPB: secondary latency timer, io/mmio base/limit, * bus numbers, bridge control * */ void pcibios_set_master(struct pci_dev *dev) { u8 lat; /* If someone already mucked with this, don't touch it. */ pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat); if (lat >= 16) return; /* ** HP generally has fewer devices on the bus than other architectures. ** upper byte is PCI_LATENCY_TIMER. */ pci_write_config_word(dev, PCI_CACHE_LINE_SIZE, (0x80 << 8) | (L1_CACHE_BYTES / sizeof(u32))); } void __init pcibios_init_bus(struct pci_bus *bus) { struct pci_dev *dev = bus->self; unsigned short bridge_ctl; /* We deal only with pci controllers and pci-pci bridges. */ if (!dev || (dev->class >> 8) != PCI_CLASS_BRIDGE_PCI) return; /* PCI-PCI bridge - set the cache line and default latency (32) for primary and secondary buses. */ pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 32); pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bridge_ctl); bridge_ctl |= PCI_BRIDGE_CTL_PARITY | PCI_BRIDGE_CTL_SERR; pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bridge_ctl); } /* KLUGE: Link the child and parent resources - generic PCI didn't */ static void pcibios_link_hba_resources( struct resource *hba_res, struct resource *r) { if (!r->parent) { printk(KERN_EMERG "PCI: resource not parented! [%lx-%lx]\n", r->start, r->end); r->parent = hba_res; /* reverse link is harder *sigh* */ if (r->parent->child) { if (r->parent->sibling) { struct resource *next = r->parent->sibling; while (next->sibling) next = next->sibling; next->sibling = r; } else { r->parent->sibling = r; } } else r->parent->child = r; } } /* called by drivers/pci/setup-bus.c:pci_setup_bridge(). */ void __devinit pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region, struct resource *res) { struct pci_bus *bus = dev->bus; struct pci_hba_data *hba = HBA_DATA(bus->bridge->platform_data); if (res->flags & IORESOURCE_IO) { /* ** I/O space may see busnumbers here. Something ** in the form of 0xbbxxxx where bb is the bus num ** and xxxx is the I/O port space address. ** Remaining address translation are done in the ** PCI Host adapter specific code - ie dino_out8. */ region->start = PCI_PORT_ADDR(res->start); region->end = PCI_PORT_ADDR(res->end); } else if (res->flags & IORESOURCE_MEM) { /* Convert MMIO addr to PCI addr (undo global virtualization) */ region->start = PCI_BUS_ADDR(hba, res->start); region->end = PCI_BUS_ADDR(hba, res->end); } DBG_RES("pcibios_resource_to_bus(%02x %s [%lx,%lx])\n", bus->number, res->flags & IORESOURCE_IO ? "IO" : "MEM", region->start, region->end); /* KLUGE ALERT ** if this resource isn't linked to a "parent", then it seems ** to be a child of the HBA - lets link it in. */ pcibios_link_hba_resources(&hba->io_space, bus->resource[0]); pcibios_link_hba_resources(&hba->lmmio_space, bus->resource[1]); } void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res, struct pci_bus_region *region) { #ifdef CONFIG_64BIT struct pci_bus *bus = dev->bus; struct pci_hba_data *hba = HBA_DATA(bus->bridge->platform_data); #endif if (res->flags & IORESOURCE_MEM) { res->start = PCI_HOST_ADDR(hba, region->start); res->end = PCI_HOST_ADDR(hba, region->end); } if (res->flags & IORESOURCE_IO) { res->start = region->start; res->end = region->end; } } #ifdef CONFIG_HOTPLUG EXPORT_SYMBOL(pcibios_resource_to_bus); EXPORT_SYMBOL(pcibios_bus_to_resource); #endif /* * pcibios align resources() is called every time generic PCI code * wants to generate a new address. The process of looking for * an available address, each candidate is first "aligned" and * then checked if the resource is available until a match is found. * * Since we are just checking candidates, don't use any fields other * than res->start. */ void pcibios_align_resource(void *data, struct resource *res, unsigned long size, unsigned long alignment) { unsigned long mask, align; DBG_RES("pcibios_align_resource(%s, (%p) [%lx,%lx]/%x, 0x%lx, 0x%lx)\n", pci_name(((struct pci_dev *) data)), res->parent, res->start, res->end, (int) res->flags, size, alignment); /* If it's not IO, then it's gotta be MEM */ align = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM; /* Align to largest of MIN or input size */ mask = max(alignment, align) - 1; res->start += mask; res->start &= ~mask; /* The caller updates the end field, we don't. */ } /* * A driver is enabling the device. We make sure that all the appropriate * bits are set to allow the device to operate as the driver is expecting. * We enable the port IO and memory IO bits if the device has any BARs of * that type, and we enable the PERR and SERR bits unconditionally. * Drivers that do not need parity (eg graphics and possibly networking) * can clear these bits if they want. */ int pcibios_enable_device(struct pci_dev *dev, int mask) { u16 cmd; int idx; pci_read_config_word(dev, PCI_COMMAND, &cmd); for (idx = 0; idx < DEVICE_COUNT_RESOURCE; idx++) { struct resource *r = &dev->resource[idx]; /* only setup requested resources */ if (!(mask & (1<flags & IORESOURCE_IO) cmd |= PCI_COMMAND_IO; if (r->flags & IORESOURCE_MEM) cmd |= PCI_COMMAND_MEMORY; } cmd |= (PCI_COMMAND_SERR | PCI_COMMAND_PARITY); #if 0 /* If bridge/bus controller has FBB enabled, child must too. */ if (dev->bus->bridge_ctl & PCI_BRIDGE_CTL_FAST_BACK) cmd |= PCI_COMMAND_FAST_BACK; #endif DBGC("PCIBIOS: Enabling device %s cmd 0x%04x\n", pci_name(dev), cmd); pci_write_config_word(dev, PCI_COMMAND, cmd); return 0; } /* PA-RISC specific */ void pcibios_register_hba(struct pci_hba_data *hba) { if (pci_hba_count >= PCI_HBA_MAX) { printk(KERN_ERR "PCI: Too many Host Bus Adapters\n"); return; } parisc_pci_hba[pci_hba_count] = hba; hba->hba_num = pci_hba_count++; } subsys_initcall(pcibios_init);