2 * arch/ppc64/kernel/rtas_pci.c
4 * Copyright (C) 2001 Dave Engebretsen, IBM Corporation
5 * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
7 * RTAS specific routines for PCI.
9 * Based on code from pci.c, chrp_pci.c and pSeries_pci.c
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 #include <linux/kernel.h>
27 #include <linux/threads.h>
28 #include <linux/pci.h>
29 #include <linux/string.h>
30 #include <linux/init.h>
31 #include <linux/bootmem.h>
34 #include <asm/pgtable.h>
37 #include <asm/machdep.h>
38 #include <asm/pci-bridge.h>
39 #include <asm/iommu.h>
42 #include <asm/ppc-pci.h>
45 static int read_pci_config;
46 static int write_pci_config;
47 static int ibm_read_pci_config;
48 static int ibm_write_pci_config;
50 static int config_access_valid(struct pci_dn *dn, int where)
54 if (where < 4096 && dn->pci_ext_config_space)
60 static int of_device_available(struct device_node * dn)
64 status = get_property(dn, "status", NULL);
69 if (!strcmp(status, "okay"))
75 static int rtas_read_config(struct device_node *dn, int where, int size, u32 *val)
78 unsigned long buid, addr;
83 return PCIBIOS_DEVICE_NOT_FOUND;
85 if (!config_access_valid(pdn, where))
86 return PCIBIOS_BAD_REGISTER_NUMBER;
88 addr = ((where & 0xf00) << 20) | (pdn->busno << 16) |
89 (pdn->devfn << 8) | (where & 0xff);
90 buid = pdn->phb->buid;
92 ret = rtas_call(ibm_read_pci_config, 4, 2, &returnval,
93 addr, buid >> 32, buid & 0xffffffff, size);
95 ret = rtas_call(read_pci_config, 2, 2, &returnval, addr, size);
100 return PCIBIOS_DEVICE_NOT_FOUND;
102 if (returnval == EEH_IO_ERROR_VALUE(size) &&
103 eeh_dn_check_failure (dn, NULL))
104 return PCIBIOS_DEVICE_NOT_FOUND;
106 return PCIBIOS_SUCCESSFUL;
109 static int rtas_pci_read_config(struct pci_bus *bus,
111 int where, int size, u32 *val)
113 struct device_node *busdn, *dn;
116 busdn = pci_device_to_OF_node(bus->self);
118 busdn = bus->sysdata; /* must be a phb */
120 /* Search only direct children of the bus */
121 for (dn = busdn->child; dn; dn = dn->sibling)
122 if (dn->data && PCI_DN(dn)->devfn == devfn
123 && of_device_available(dn))
124 return rtas_read_config(dn, where, size, val);
126 return PCIBIOS_DEVICE_NOT_FOUND;
129 int rtas_write_config(struct device_node *dn, int where, int size, u32 val)
131 unsigned long buid, addr;
135 if (!dn || !dn->data)
136 return PCIBIOS_DEVICE_NOT_FOUND;
138 if (!config_access_valid(pdn, where))
139 return PCIBIOS_BAD_REGISTER_NUMBER;
141 addr = ((where & 0xf00) << 20) | (pdn->busno << 16) |
142 (pdn->devfn << 8) | (where & 0xff);
143 buid = pdn->phb->buid;
145 ret = rtas_call(ibm_write_pci_config, 5, 1, NULL, addr, buid >> 32, buid & 0xffffffff, size, (ulong) val);
147 ret = rtas_call(write_pci_config, 3, 1, NULL, addr, size, (ulong)val);
151 return PCIBIOS_DEVICE_NOT_FOUND;
153 return PCIBIOS_SUCCESSFUL;
156 static int rtas_pci_write_config(struct pci_bus *bus,
158 int where, int size, u32 val)
160 struct device_node *busdn, *dn;
163 busdn = pci_device_to_OF_node(bus->self);
165 busdn = bus->sysdata; /* must be a phb */
167 /* Search only direct children of the bus */
168 for (dn = busdn->child; dn; dn = dn->sibling)
169 if (dn->data && PCI_DN(dn)->devfn == devfn
170 && of_device_available(dn))
171 return rtas_write_config(dn, where, size, val);
172 return PCIBIOS_DEVICE_NOT_FOUND;
175 struct pci_ops rtas_pci_ops = {
176 rtas_pci_read_config,
177 rtas_pci_write_config
180 int is_python(struct device_node *dev)
182 char *model = (char *)get_property(dev, "model", NULL);
184 if (model && strstr(model, "Python"))
190 static int get_phb_reg_prop(struct device_node *dev,
191 unsigned int addr_size_words,
192 struct reg_property64 *reg)
194 unsigned int *ui_ptr = NULL, len;
196 /* Found a PHB, now figure out where his registers are mapped. */
197 ui_ptr = (unsigned int *)get_property(dev, "reg", &len);
201 if (addr_size_words == 1) {
202 reg->address = ((struct reg_property32 *)ui_ptr)->address;
203 reg->size = ((struct reg_property32 *)ui_ptr)->size;
205 *reg = *((struct reg_property64 *)ui_ptr);
211 static void python_countermeasures(struct device_node *dev,
212 unsigned int addr_size_words)
214 struct reg_property64 reg_struct;
215 void __iomem *chip_regs;
218 if (get_phb_reg_prop(dev, addr_size_words, ®_struct))
221 /* Python's register file is 1 MB in size. */
222 chip_regs = ioremap(reg_struct.address & ~(0xfffffUL), 0x100000);
225 * Firmware doesn't always clear this bit which is critical
226 * for good performance - Anton
229 #define PRG_CL_RESET_VALID 0x00010000
231 val = in_be32(chip_regs + 0xf6030);
232 if (val & PRG_CL_RESET_VALID) {
233 printk(KERN_INFO "Python workaround: ");
234 val &= ~PRG_CL_RESET_VALID;
235 out_be32(chip_regs + 0xf6030, val);
237 * We must read it back for changes to
240 val = in_be32(chip_regs + 0xf6030);
241 printk("reg0: %x\n", val);
247 void __init init_pci_config_tokens (void)
249 read_pci_config = rtas_token("read-pci-config");
250 write_pci_config = rtas_token("write-pci-config");
251 ibm_read_pci_config = rtas_token("ibm,read-pci-config");
252 ibm_write_pci_config = rtas_token("ibm,write-pci-config");
255 unsigned long __devinit get_phb_buid (struct device_node *phb)
258 unsigned int *buid_vals;
262 if (ibm_read_pci_config == -1) return 0;
264 /* PHB's will always be children of the root node,
265 * or so it is promised by the current firmware. */
266 if (phb->parent == NULL)
268 if (phb->parent->parent)
271 buid_vals = (unsigned int *) get_property(phb, "reg", &len);
272 if (buid_vals == NULL)
275 addr_cells = prom_n_addr_cells(phb);
276 if (addr_cells == 1) {
277 buid = (unsigned long) buid_vals[0];
279 buid = (((unsigned long)buid_vals[0]) << 32UL) |
280 (((unsigned long)buid_vals[1]) & 0xffffffff);
285 static int phb_set_bus_ranges(struct device_node *dev,
286 struct pci_controller *phb)
291 bus_range = (int *) get_property(dev, "bus-range", &len);
292 if (bus_range == NULL || len < 2 * sizeof(int)) {
296 phb->first_busno = bus_range[0];
297 phb->last_busno = bus_range[1];
302 static int __devinit setup_phb(struct device_node *dev,
303 struct pci_controller *phb,
304 unsigned int addr_size_words)
306 pci_setup_pci_controller(phb);
309 python_countermeasures(dev, addr_size_words);
311 if (phb_set_bus_ranges(dev, phb))
314 phb->arch_data = dev;
315 phb->ops = &rtas_pci_ops;
316 phb->buid = get_phb_buid(dev);
321 static void __devinit add_linux_pci_domain(struct device_node *dev,
322 struct pci_controller *phb,
323 struct property *of_prop)
325 memset(of_prop, 0, sizeof(struct property));
326 of_prop->name = "linux,pci-domain";
327 of_prop->length = sizeof(phb->global_number);
328 of_prop->value = (unsigned char *)&of_prop[1];
329 memcpy(of_prop->value, &phb->global_number, sizeof(phb->global_number));
330 prom_add_property(dev, of_prop);
333 static struct pci_controller * __init alloc_phb(struct device_node *dev,
334 unsigned int addr_size_words)
336 struct pci_controller *phb;
337 struct property *of_prop;
339 phb = alloc_bootmem(sizeof(struct pci_controller));
343 of_prop = alloc_bootmem(sizeof(struct property) +
344 sizeof(phb->global_number));
348 if (setup_phb(dev, phb, addr_size_words))
351 add_linux_pci_domain(dev, phb, of_prop);
356 static struct pci_controller * __devinit alloc_phb_dynamic(struct device_node *dev, unsigned int addr_size_words)
358 struct pci_controller *phb;
360 phb = (struct pci_controller *)kmalloc(sizeof(struct pci_controller),
365 if (setup_phb(dev, phb, addr_size_words))
370 /* TODO: linux,pci-domain? */
375 unsigned long __init find_and_init_phbs(void)
377 struct device_node *node;
378 struct pci_controller *phb;
379 unsigned int root_size_cells = 0;
381 unsigned int *opprop = NULL;
382 struct device_node *root = of_find_node_by_path("/");
384 if (ppc64_interrupt_controller == IC_OPEN_PIC) {
385 opprop = (unsigned int *)get_property(root,
386 "platform-open-pic", NULL);
389 root_size_cells = prom_n_size_cells(root);
393 for (node = of_get_next_child(root, NULL);
395 node = of_get_next_child(root, node)) {
396 if (node->type == NULL || strcmp(node->type, "pci") != 0)
399 phb = alloc_phb(node, root_size_cells);
403 pci_process_bridge_OF_ranges(phb, node, 0);
404 pci_setup_phb_io(phb, index == 0);
405 #ifdef CONFIG_PPC_PSERIES
406 if (ppc64_interrupt_controller == IC_OPEN_PIC && pSeries_mpic) {
407 int addr = root_size_cells * (index + 2) - 1;
408 mpic_assign_isu(pSeries_mpic, index, opprop[addr]);
418 * pci_probe_only and pci_assign_all_buses can be set via properties
424 prop = (int *)get_property(of_chosen, "linux,pci-probe-only",
427 pci_probe_only = *prop;
429 prop = (int *)get_property(of_chosen,
430 "linux,pci-assign-all-buses", NULL);
432 pci_assign_all_buses = *prop;
438 struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
440 struct device_node *root = of_find_node_by_path("/");
441 unsigned int root_size_cells = 0;
442 struct pci_controller *phb;
446 root_size_cells = prom_n_size_cells(root);
448 primary = list_empty(&hose_list);
449 phb = alloc_phb_dynamic(dn, root_size_cells);
453 pci_process_bridge_OF_ranges(phb, dn, primary);
455 pci_setup_phb_io_dynamic(phb, primary);
458 pci_devs_phb_init_dynamic(phb);
459 phb->last_busno = 0xff;
460 bus = pci_scan_bus(phb->first_busno, phb->ops, phb->arch_data);
462 phb->last_busno = bus->subordinate;
466 EXPORT_SYMBOL(init_phb_dynamic);
468 /* RPA-specific bits for removing PHBs */
469 int pcibios_remove_root_bus(struct pci_controller *phb)
471 struct pci_bus *b = phb->bus;
472 struct resource *res;
475 res = b->resource[0];
477 printk(KERN_ERR "%s: no IO resource for PHB %s\n", __FUNCTION__,
482 rc = unmap_bus_range(b);
484 printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
485 __FUNCTION__, b->name);
489 if (release_resource(res)) {
490 printk(KERN_ERR "%s: failed to release IO on bus %s\n",
491 __FUNCTION__, b->name);
495 for (i = 1; i < 3; ++i) {
496 res = b->resource[i];
497 if (!res->flags && i == 0) {
498 printk(KERN_ERR "%s: no MEM resource for PHB %s\n",
499 __FUNCTION__, b->name);
502 if (res->flags && release_resource(res)) {
504 "%s: failed to release IO %d on bus %s\n",
505 __FUNCTION__, i, b->name);
510 list_del(&phb->list_node);
516 EXPORT_SYMBOL(pcibios_remove_root_bus);