/* * Copyright (C) 2001 Dave Engebretsen, IBM Corporation * Copyright (C) 2003 Anton Blanchard , IBM * * RTAS specific routines for PCI. * * Based on code from pci.c, chrp_pci.c and pSeries_pci.c * * 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. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* RTAS tokens */ static int read_pci_config; static int write_pci_config; static int ibm_read_pci_config; static int ibm_write_pci_config; static inline int config_access_valid(struct pci_dn *dn, int where) { if (where < 256) return 1; if (where < 4096 && dn->pci_ext_config_space) return 1; return 0; } static int of_device_available(struct device_node * dn) { char * status; status = get_property(dn, "status", NULL); if (!status) return 1; if (!strcmp(status, "okay")) return 1; return 0; } int rtas_read_config(struct pci_dn *pdn, int where, int size, u32 *val) { int returnval = -1; unsigned long buid, addr; int ret; if (!pdn) return PCIBIOS_DEVICE_NOT_FOUND; if (!config_access_valid(pdn, where)) return PCIBIOS_BAD_REGISTER_NUMBER; addr = ((where & 0xf00) << 20) | (pdn->busno << 16) | (pdn->devfn << 8) | (where & 0xff); buid = pdn->phb->buid; if (buid) { ret = rtas_call(ibm_read_pci_config, 4, 2, &returnval, addr, BUID_HI(buid), BUID_LO(buid), size); } else { ret = rtas_call(read_pci_config, 2, 2, &returnval, addr, size); } *val = returnval; if (ret) return PCIBIOS_DEVICE_NOT_FOUND; if (returnval == EEH_IO_ERROR_VALUE(size) && eeh_dn_check_failure (pdn->node, NULL)) return PCIBIOS_DEVICE_NOT_FOUND; return PCIBIOS_SUCCESSFUL; } static int rtas_pci_read_config(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val) { struct device_node *busdn, *dn; if (bus->self) busdn = pci_device_to_OF_node(bus->self); else busdn = bus->sysdata; /* must be a phb */ /* Search only direct children of the bus */ for (dn = busdn->child; dn; dn = dn->sibling) { struct pci_dn *pdn = PCI_DN(dn); if (pdn && pdn->devfn == devfn && of_device_available(dn)) return rtas_read_config(pdn, where, size, val); } return PCIBIOS_DEVICE_NOT_FOUND; } int rtas_write_config(struct pci_dn *pdn, int where, int size, u32 val) { unsigned long buid, addr; int ret; if (!pdn) return PCIBIOS_DEVICE_NOT_FOUND; if (!config_access_valid(pdn, where)) return PCIBIOS_BAD_REGISTER_NUMBER; addr = ((where & 0xf00) << 20) | (pdn->busno << 16) | (pdn->devfn << 8) | (where & 0xff); buid = pdn->phb->buid; if (buid) { ret = rtas_call(ibm_write_pci_config, 5, 1, NULL, addr, BUID_HI(buid), BUID_LO(buid), size, (ulong) val); } else { ret = rtas_call(write_pci_config, 3, 1, NULL, addr, size, (ulong)val); } if (ret) return PCIBIOS_DEVICE_NOT_FOUND; return PCIBIOS_SUCCESSFUL; } static int rtas_pci_write_config(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val) { struct device_node *busdn, *dn; if (bus->self) busdn = pci_device_to_OF_node(bus->self); else busdn = bus->sysdata; /* must be a phb */ /* Search only direct children of the bus */ for (dn = busdn->child; dn; dn = dn->sibling) { struct pci_dn *pdn = PCI_DN(dn); if (pdn && pdn->devfn == devfn && of_device_available(dn)) return rtas_write_config(pdn, where, size, val); } return PCIBIOS_DEVICE_NOT_FOUND; } struct pci_ops rtas_pci_ops = { rtas_pci_read_config, rtas_pci_write_config }; int is_python(struct device_node *dev) { char *model = (char *)get_property(dev, "model", NULL); if (model && strstr(model, "Python")) return 1; return 0; } static void python_countermeasures(struct device_node *dev) { struct resource registers; void __iomem *chip_regs; volatile u32 val; if (of_address_to_resource(dev, 0, ®isters)) { printk(KERN_ERR "Can't get address for Python workarounds !\n"); return; } /* Python's register file is 1 MB in size. */ chip_regs = ioremap(registers.start & ~(0xfffffUL), 0x100000); /* * Firmware doesn't always clear this bit which is critical * for good performance - Anton */ #define PRG_CL_RESET_VALID 0x00010000 val = in_be32(chip_regs + 0xf6030); if (val & PRG_CL_RESET_VALID) { printk(KERN_INFO "Python workaround: "); val &= ~PRG_CL_RESET_VALID; out_be32(chip_regs + 0xf6030, val); /* * We must read it back for changes to * take effect */ val = in_be32(chip_regs + 0xf6030); printk("reg0: %x\n", val); } iounmap(chip_regs); } void __init init_pci_config_tokens (void) { read_pci_config = rtas_token("read-pci-config"); write_pci_config = rtas_token("write-pci-config"); ibm_read_pci_config = rtas_token("ibm,read-pci-config"); ibm_write_pci_config = rtas_token("ibm,write-pci-config"); } unsigned long __devinit get_phb_buid (struct device_node *phb) { int addr_cells; unsigned int *buid_vals; unsigned int len; unsigned long buid; if (ibm_read_pci_config == -1) return 0; /* PHB's will always be children of the root node, * or so it is promised by the current firmware. */ if (phb->parent == NULL) return 0; if (phb->parent->parent) return 0; buid_vals = (unsigned int *) get_property(phb, "reg", &len); if (buid_vals == NULL) return 0; addr_cells = prom_n_addr_cells(phb); if (addr_cells == 1) { buid = (unsigned long) buid_vals[0]; } else { buid = (((unsigned long)buid_vals[0]) << 32UL) | (((unsigned long)buid_vals[1]) & 0xffffffff); } return buid; } static int phb_set_bus_ranges(struct device_node *dev, struct pci_controller *phb) { int *bus_range; unsigned int len; bus_range = (int *) get_property(dev, "bus-range", &len); if (bus_range == NULL || len < 2 * sizeof(int)) { return 1; } phb->first_busno = bus_range[0]; phb->last_busno = bus_range[1]; return 0; } int __devinit setup_phb(struct device_node *dev, struct pci_controller *phb) { if (is_python(dev)) python_countermeasures(dev); if (phb_set_bus_ranges(dev, phb)) return 1; phb->ops = &rtas_pci_ops; phb->buid = get_phb_buid(dev); return 0; } unsigned long __init find_and_init_phbs(void) { struct device_node *node; struct pci_controller *phb; unsigned int index; unsigned int root_size_cells = 0; unsigned int *opprop = NULL; struct device_node *root = of_find_node_by_path("/"); if (ppc64_interrupt_controller == IC_OPEN_PIC) { opprop = (unsigned int *)get_property(root, "platform-open-pic", NULL); } root_size_cells = prom_n_size_cells(root); index = 0; for (node = of_get_next_child(root, NULL); node != NULL; node = of_get_next_child(root, node)) { if (node->type == NULL || strcmp(node->type, "pci") != 0) continue; phb = pcibios_alloc_controller(node); if (!phb) continue; setup_phb(node, phb); pci_process_bridge_OF_ranges(phb, node, 0); pci_setup_phb_io(phb, index == 0); #ifdef CONFIG_PPC_PSERIES /* XXX This code need serious fixing ... --BenH */ if (ppc64_interrupt_controller == IC_OPEN_PIC && pSeries_mpic) { int addr = root_size_cells * (index + 2) - 1; mpic_assign_isu(pSeries_mpic, index, opprop[addr]); } #endif index++; } of_node_put(root); pci_devs_phb_init(); /* * pci_probe_only and pci_assign_all_buses can be set via properties * in chosen. */ if (of_chosen) { int *prop; prop = (int *)get_property(of_chosen, "linux,pci-probe-only", NULL); if (prop) pci_probe_only = *prop; prop = (int *)get_property(of_chosen, "linux,pci-assign-all-buses", NULL); if (prop) pci_assign_all_buses = *prop; } return 0; } /* RPA-specific bits for removing PHBs */ int pcibios_remove_root_bus(struct pci_controller *phb) { struct pci_bus *b = phb->bus; struct resource *res; int rc, i; res = b->resource[0]; if (!res->flags) { printk(KERN_ERR "%s: no IO resource for PHB %s\n", __FUNCTION__, b->name); return 1; } rc = unmap_bus_range(b); if (rc) { printk(KERN_ERR "%s: failed to unmap IO on bus %s\n", __FUNCTION__, b->name); return 1; } if (release_resource(res)) { printk(KERN_ERR "%s: failed to release IO on bus %s\n", __FUNCTION__, b->name); return 1; } for (i = 1; i < 3; ++i) { res = b->resource[i]; if (!res->flags && i == 0) { printk(KERN_ERR "%s: no MEM resource for PHB %s\n", __FUNCTION__, b->name); return 1; } if (res->flags && release_resource(res)) { printk(KERN_ERR "%s: failed to release IO %d on bus %s\n", __FUNCTION__, i, b->name); return 1; } } list_del(&phb->list_node); pcibios_free_controller(phb); return 0; } EXPORT_SYMBOL(pcibios_remove_root_bus);