| 1 | /* |
| 2 | * Copyright (C) 2001 Dave Engebretsen, IBM Corporation |
| 3 | * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM |
| 4 | * |
| 5 | * RTAS specific routines for PCI. |
| 6 | * |
| 7 | * Based on code from pci.c, chrp_pci.c and pSeries_pci.c |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 22 | */ |
| 23 | |
| 24 | #include <linux/kernel.h> |
| 25 | #include <linux/threads.h> |
| 26 | #include <linux/pci.h> |
| 27 | #include <linux/string.h> |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/bootmem.h> |
| 30 | |
| 31 | #include <asm/io.h> |
| 32 | #include <asm/pgtable.h> |
| 33 | #include <asm/irq.h> |
| 34 | #include <asm/prom.h> |
| 35 | #include <asm/machdep.h> |
| 36 | #include <asm/pci-bridge.h> |
| 37 | #include <asm/iommu.h> |
| 38 | #include <asm/rtas.h> |
| 39 | #include <asm/mpic.h> |
| 40 | #include <asm/ppc-pci.h> |
| 41 | |
| 42 | /* RTAS tokens */ |
| 43 | static int read_pci_config; |
| 44 | static int write_pci_config; |
| 45 | static int ibm_read_pci_config; |
| 46 | static int ibm_write_pci_config; |
| 47 | |
| 48 | static inline int config_access_valid(struct pci_dn *dn, int where) |
| 49 | { |
| 50 | if (where < 256) |
| 51 | return 1; |
| 52 | if (where < 4096 && dn->pci_ext_config_space) |
| 53 | return 1; |
| 54 | |
| 55 | return 0; |
| 56 | } |
| 57 | |
| 58 | static int of_device_available(struct device_node * dn) |
| 59 | { |
| 60 | const char *status; |
| 61 | |
| 62 | status = get_property(dn, "status", NULL); |
| 63 | |
| 64 | if (!status) |
| 65 | return 1; |
| 66 | |
| 67 | if (!strcmp(status, "okay")) |
| 68 | return 1; |
| 69 | |
| 70 | return 0; |
| 71 | } |
| 72 | |
| 73 | int rtas_read_config(struct pci_dn *pdn, int where, int size, u32 *val) |
| 74 | { |
| 75 | int returnval = -1; |
| 76 | unsigned long buid, addr; |
| 77 | int ret; |
| 78 | |
| 79 | if (!pdn) |
| 80 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 81 | if (!config_access_valid(pdn, where)) |
| 82 | return PCIBIOS_BAD_REGISTER_NUMBER; |
| 83 | |
| 84 | addr = ((where & 0xf00) << 20) | (pdn->busno << 16) | |
| 85 | (pdn->devfn << 8) | (where & 0xff); |
| 86 | buid = pdn->phb->buid; |
| 87 | if (buid) { |
| 88 | ret = rtas_call(ibm_read_pci_config, 4, 2, &returnval, |
| 89 | addr, BUID_HI(buid), BUID_LO(buid), size); |
| 90 | } else { |
| 91 | ret = rtas_call(read_pci_config, 2, 2, &returnval, addr, size); |
| 92 | } |
| 93 | *val = returnval; |
| 94 | |
| 95 | if (ret) |
| 96 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 97 | |
| 98 | if (returnval == EEH_IO_ERROR_VALUE(size) && |
| 99 | eeh_dn_check_failure (pdn->node, NULL)) |
| 100 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 101 | |
| 102 | return PCIBIOS_SUCCESSFUL; |
| 103 | } |
| 104 | |
| 105 | static int rtas_pci_read_config(struct pci_bus *bus, |
| 106 | unsigned int devfn, |
| 107 | int where, int size, u32 *val) |
| 108 | { |
| 109 | struct device_node *busdn, *dn; |
| 110 | |
| 111 | if (bus->self) |
| 112 | busdn = pci_device_to_OF_node(bus->self); |
| 113 | else |
| 114 | busdn = bus->sysdata; /* must be a phb */ |
| 115 | |
| 116 | /* Search only direct children of the bus */ |
| 117 | for (dn = busdn->child; dn; dn = dn->sibling) { |
| 118 | struct pci_dn *pdn = PCI_DN(dn); |
| 119 | if (pdn && pdn->devfn == devfn |
| 120 | && of_device_available(dn)) |
| 121 | return rtas_read_config(pdn, where, size, val); |
| 122 | } |
| 123 | |
| 124 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 125 | } |
| 126 | |
| 127 | int rtas_write_config(struct pci_dn *pdn, int where, int size, u32 val) |
| 128 | { |
| 129 | unsigned long buid, addr; |
| 130 | int ret; |
| 131 | |
| 132 | if (!pdn) |
| 133 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 134 | if (!config_access_valid(pdn, where)) |
| 135 | return PCIBIOS_BAD_REGISTER_NUMBER; |
| 136 | |
| 137 | addr = ((where & 0xf00) << 20) | (pdn->busno << 16) | |
| 138 | (pdn->devfn << 8) | (where & 0xff); |
| 139 | buid = pdn->phb->buid; |
| 140 | if (buid) { |
| 141 | ret = rtas_call(ibm_write_pci_config, 5, 1, NULL, addr, |
| 142 | BUID_HI(buid), BUID_LO(buid), size, (ulong) val); |
| 143 | } else { |
| 144 | ret = rtas_call(write_pci_config, 3, 1, NULL, addr, size, (ulong)val); |
| 145 | } |
| 146 | |
| 147 | if (ret) |
| 148 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 149 | |
| 150 | return PCIBIOS_SUCCESSFUL; |
| 151 | } |
| 152 | |
| 153 | static int rtas_pci_write_config(struct pci_bus *bus, |
| 154 | unsigned int devfn, |
| 155 | int where, int size, u32 val) |
| 156 | { |
| 157 | struct device_node *busdn, *dn; |
| 158 | |
| 159 | if (bus->self) |
| 160 | busdn = pci_device_to_OF_node(bus->self); |
| 161 | else |
| 162 | busdn = bus->sysdata; /* must be a phb */ |
| 163 | |
| 164 | /* Search only direct children of the bus */ |
| 165 | for (dn = busdn->child; dn; dn = dn->sibling) { |
| 166 | struct pci_dn *pdn = PCI_DN(dn); |
| 167 | if (pdn && pdn->devfn == devfn |
| 168 | && of_device_available(dn)) |
| 169 | return rtas_write_config(pdn, where, size, val); |
| 170 | } |
| 171 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 172 | } |
| 173 | |
| 174 | struct pci_ops rtas_pci_ops = { |
| 175 | rtas_pci_read_config, |
| 176 | rtas_pci_write_config |
| 177 | }; |
| 178 | |
| 179 | int is_python(struct device_node *dev) |
| 180 | { |
| 181 | const char *model = get_property(dev, "model", NULL); |
| 182 | |
| 183 | if (model && strstr(model, "Python")) |
| 184 | return 1; |
| 185 | |
| 186 | return 0; |
| 187 | } |
| 188 | |
| 189 | static void python_countermeasures(struct device_node *dev) |
| 190 | { |
| 191 | struct resource registers; |
| 192 | void __iomem *chip_regs; |
| 193 | volatile u32 val; |
| 194 | |
| 195 | if (of_address_to_resource(dev, 0, ®isters)) { |
| 196 | printk(KERN_ERR "Can't get address for Python workarounds !\n"); |
| 197 | return; |
| 198 | } |
| 199 | |
| 200 | /* Python's register file is 1 MB in size. */ |
| 201 | chip_regs = ioremap(registers.start & ~(0xfffffUL), 0x100000); |
| 202 | |
| 203 | /* |
| 204 | * Firmware doesn't always clear this bit which is critical |
| 205 | * for good performance - Anton |
| 206 | */ |
| 207 | |
| 208 | #define PRG_CL_RESET_VALID 0x00010000 |
| 209 | |
| 210 | val = in_be32(chip_regs + 0xf6030); |
| 211 | if (val & PRG_CL_RESET_VALID) { |
| 212 | printk(KERN_INFO "Python workaround: "); |
| 213 | val &= ~PRG_CL_RESET_VALID; |
| 214 | out_be32(chip_regs + 0xf6030, val); |
| 215 | /* |
| 216 | * We must read it back for changes to |
| 217 | * take effect |
| 218 | */ |
| 219 | val = in_be32(chip_regs + 0xf6030); |
| 220 | printk("reg0: %x\n", val); |
| 221 | } |
| 222 | |
| 223 | iounmap(chip_regs); |
| 224 | } |
| 225 | |
| 226 | void __init init_pci_config_tokens (void) |
| 227 | { |
| 228 | read_pci_config = rtas_token("read-pci-config"); |
| 229 | write_pci_config = rtas_token("write-pci-config"); |
| 230 | ibm_read_pci_config = rtas_token("ibm,read-pci-config"); |
| 231 | ibm_write_pci_config = rtas_token("ibm,write-pci-config"); |
| 232 | } |
| 233 | |
| 234 | unsigned long __devinit get_phb_buid (struct device_node *phb) |
| 235 | { |
| 236 | int addr_cells; |
| 237 | const unsigned int *buid_vals; |
| 238 | unsigned int len; |
| 239 | unsigned long buid; |
| 240 | |
| 241 | if (ibm_read_pci_config == -1) return 0; |
| 242 | |
| 243 | /* PHB's will always be children of the root node, |
| 244 | * or so it is promised by the current firmware. */ |
| 245 | if (phb->parent == NULL) |
| 246 | return 0; |
| 247 | if (phb->parent->parent) |
| 248 | return 0; |
| 249 | |
| 250 | buid_vals = get_property(phb, "reg", &len); |
| 251 | if (buid_vals == NULL) |
| 252 | return 0; |
| 253 | |
| 254 | addr_cells = prom_n_addr_cells(phb); |
| 255 | if (addr_cells == 1) { |
| 256 | buid = (unsigned long) buid_vals[0]; |
| 257 | } else { |
| 258 | buid = (((unsigned long)buid_vals[0]) << 32UL) | |
| 259 | (((unsigned long)buid_vals[1]) & 0xffffffff); |
| 260 | } |
| 261 | return buid; |
| 262 | } |
| 263 | |
| 264 | static int phb_set_bus_ranges(struct device_node *dev, |
| 265 | struct pci_controller *phb) |
| 266 | { |
| 267 | const int *bus_range; |
| 268 | unsigned int len; |
| 269 | |
| 270 | bus_range = get_property(dev, "bus-range", &len); |
| 271 | if (bus_range == NULL || len < 2 * sizeof(int)) { |
| 272 | return 1; |
| 273 | } |
| 274 | |
| 275 | phb->first_busno = bus_range[0]; |
| 276 | phb->last_busno = bus_range[1]; |
| 277 | |
| 278 | return 0; |
| 279 | } |
| 280 | |
| 281 | int __devinit setup_phb(struct device_node *dev, struct pci_controller *phb) |
| 282 | { |
| 283 | if (is_python(dev)) |
| 284 | python_countermeasures(dev); |
| 285 | |
| 286 | if (phb_set_bus_ranges(dev, phb)) |
| 287 | return 1; |
| 288 | |
| 289 | phb->ops = &rtas_pci_ops; |
| 290 | phb->buid = get_phb_buid(dev); |
| 291 | |
| 292 | return 0; |
| 293 | } |
| 294 | |
| 295 | unsigned long __init find_and_init_phbs(void) |
| 296 | { |
| 297 | struct device_node *node; |
| 298 | struct pci_controller *phb; |
| 299 | unsigned int index; |
| 300 | struct device_node *root = of_find_node_by_path("/"); |
| 301 | |
| 302 | index = 0; |
| 303 | for (node = of_get_next_child(root, NULL); |
| 304 | node != NULL; |
| 305 | node = of_get_next_child(root, node)) { |
| 306 | |
| 307 | if (node->type == NULL || (strcmp(node->type, "pci") != 0 && |
| 308 | strcmp(node->type, "pciex") != 0)) |
| 309 | continue; |
| 310 | |
| 311 | phb = pcibios_alloc_controller(node); |
| 312 | if (!phb) |
| 313 | continue; |
| 314 | setup_phb(node, phb); |
| 315 | pci_process_bridge_OF_ranges(phb, node, 0); |
| 316 | pci_setup_phb_io(phb, index == 0); |
| 317 | index++; |
| 318 | } |
| 319 | |
| 320 | of_node_put(root); |
| 321 | pci_devs_phb_init(); |
| 322 | |
| 323 | /* |
| 324 | * pci_probe_only and pci_assign_all_buses can be set via properties |
| 325 | * in chosen. |
| 326 | */ |
| 327 | if (of_chosen) { |
| 328 | const int *prop; |
| 329 | |
| 330 | prop = get_property(of_chosen, |
| 331 | "linux,pci-probe-only", NULL); |
| 332 | if (prop) |
| 333 | pci_probe_only = *prop; |
| 334 | |
| 335 | prop = get_property(of_chosen, |
| 336 | "linux,pci-assign-all-buses", NULL); |
| 337 | if (prop) |
| 338 | pci_assign_all_buses = *prop; |
| 339 | } |
| 340 | |
| 341 | return 0; |
| 342 | } |
| 343 | |
| 344 | /* RPA-specific bits for removing PHBs */ |
| 345 | int pcibios_remove_root_bus(struct pci_controller *phb) |
| 346 | { |
| 347 | struct pci_bus *b = phb->bus; |
| 348 | struct resource *res; |
| 349 | int rc, i; |
| 350 | |
| 351 | res = b->resource[0]; |
| 352 | if (!res->flags) { |
| 353 | printk(KERN_ERR "%s: no IO resource for PHB %s\n", __FUNCTION__, |
| 354 | b->name); |
| 355 | return 1; |
| 356 | } |
| 357 | |
| 358 | rc = unmap_bus_range(b); |
| 359 | if (rc) { |
| 360 | printk(KERN_ERR "%s: failed to unmap IO on bus %s\n", |
| 361 | __FUNCTION__, b->name); |
| 362 | return 1; |
| 363 | } |
| 364 | |
| 365 | if (release_resource(res)) { |
| 366 | printk(KERN_ERR "%s: failed to release IO on bus %s\n", |
| 367 | __FUNCTION__, b->name); |
| 368 | return 1; |
| 369 | } |
| 370 | |
| 371 | for (i = 1; i < 3; ++i) { |
| 372 | res = b->resource[i]; |
| 373 | if (!res->flags && i == 0) { |
| 374 | printk(KERN_ERR "%s: no MEM resource for PHB %s\n", |
| 375 | __FUNCTION__, b->name); |
| 376 | return 1; |
| 377 | } |
| 378 | if (res->flags && release_resource(res)) { |
| 379 | printk(KERN_ERR |
| 380 | "%s: failed to release IO %d on bus %s\n", |
| 381 | __FUNCTION__, i, b->name); |
| 382 | return 1; |
| 383 | } |
| 384 | } |
| 385 | |
| 386 | list_del(&phb->list_node); |
| 387 | pcibios_free_controller(phb); |
| 388 | |
| 389 | return 0; |
| 390 | } |
| 391 | EXPORT_SYMBOL(pcibios_remove_root_bus); |