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>
46 static int read_pci_config;
47 static int write_pci_config;
48 static int ibm_read_pci_config;
49 static int ibm_write_pci_config;
51 static int config_access_valid(struct pci_dn *dn, int where)
55 if (where < 4096 && dn->pci_ext_config_space)
61 static int of_device_available(struct device_node * dn)
65 status = get_property(dn, "status", NULL);
70 if (!strcmp(status, "okay"))
76 static int rtas_read_config(struct device_node *dn, int where, int size, u32 *val)
79 unsigned long buid, addr;
84 return PCIBIOS_DEVICE_NOT_FOUND;
86 if (!config_access_valid(pdn, where))
87 return PCIBIOS_BAD_REGISTER_NUMBER;
89 addr = ((where & 0xf00) << 20) | (pdn->busno << 16) |
90 (pdn->devfn << 8) | (where & 0xff);
91 buid = pdn->phb->buid;
93 ret = rtas_call(ibm_read_pci_config, 4, 2, &returnval,
94 addr, buid >> 32, buid & 0xffffffff, size);
96 ret = rtas_call(read_pci_config, 2, 2, &returnval, addr, size);
101 return PCIBIOS_DEVICE_NOT_FOUND;
103 if (returnval == EEH_IO_ERROR_VALUE(size) &&
104 eeh_dn_check_failure (dn, NULL))
105 return PCIBIOS_DEVICE_NOT_FOUND;
107 return PCIBIOS_SUCCESSFUL;
110 static int rtas_pci_read_config(struct pci_bus *bus,
112 int where, int size, u32 *val)
114 struct device_node *busdn, *dn;
117 busdn = pci_device_to_OF_node(bus->self);
119 busdn = bus->sysdata; /* must be a phb */
121 /* Search only direct children of the bus */
122 for (dn = busdn->child; dn; dn = dn->sibling)
123 if (dn->data && PCI_DN(dn)->devfn == devfn
124 && of_device_available(dn))
125 return rtas_read_config(dn, where, size, val);
127 return PCIBIOS_DEVICE_NOT_FOUND;
130 int rtas_write_config(struct device_node *dn, int where, int size, u32 val)
132 unsigned long buid, addr;
136 if (!dn || !dn->data)
137 return PCIBIOS_DEVICE_NOT_FOUND;
139 if (!config_access_valid(pdn, where))
140 return PCIBIOS_BAD_REGISTER_NUMBER;
142 addr = ((where & 0xf00) << 20) | (pdn->busno << 16) |
143 (pdn->devfn << 8) | (where & 0xff);
144 buid = pdn->phb->buid;
146 ret = rtas_call(ibm_write_pci_config, 5, 1, NULL, addr, buid >> 32, buid & 0xffffffff, size, (ulong) val);
148 ret = rtas_call(write_pci_config, 3, 1, NULL, addr, size, (ulong)val);
152 return PCIBIOS_DEVICE_NOT_FOUND;
154 return PCIBIOS_SUCCESSFUL;
157 static int rtas_pci_write_config(struct pci_bus *bus,
159 int where, int size, u32 val)
161 struct device_node *busdn, *dn;
164 busdn = pci_device_to_OF_node(bus->self);
166 busdn = bus->sysdata; /* must be a phb */
168 /* Search only direct children of the bus */
169 for (dn = busdn->child; dn; dn = dn->sibling)
170 if (dn->data && PCI_DN(dn)->devfn == devfn
171 && of_device_available(dn))
172 return rtas_write_config(dn, where, size, val);
173 return PCIBIOS_DEVICE_NOT_FOUND;
176 struct pci_ops rtas_pci_ops = {
177 rtas_pci_read_config,
178 rtas_pci_write_config
181 int is_python(struct device_node *dev)
183 char *model = (char *)get_property(dev, "model", NULL);
185 if (model && strstr(model, "Python"))
191 static int get_phb_reg_prop(struct device_node *dev,
192 unsigned int addr_size_words,
193 struct reg_property64 *reg)
195 unsigned int *ui_ptr = NULL, len;
197 /* Found a PHB, now figure out where his registers are mapped. */
198 ui_ptr = (unsigned int *)get_property(dev, "reg", &len);
202 if (addr_size_words == 1) {
203 reg->address = ((struct reg_property32 *)ui_ptr)->address;
204 reg->size = ((struct reg_property32 *)ui_ptr)->size;
206 *reg = *((struct reg_property64 *)ui_ptr);
212 static void python_countermeasures(struct device_node *dev,
213 unsigned int addr_size_words)
215 struct reg_property64 reg_struct;
216 void __iomem *chip_regs;
219 if (get_phb_reg_prop(dev, addr_size_words, ®_struct))
222 /* Python's register file is 1 MB in size. */
223 chip_regs = ioremap(reg_struct.address & ~(0xfffffUL), 0x100000);
226 * Firmware doesn't always clear this bit which is critical
227 * for good performance - Anton
230 #define PRG_CL_RESET_VALID 0x00010000
232 val = in_be32(chip_regs + 0xf6030);
233 if (val & PRG_CL_RESET_VALID) {
234 printk(KERN_INFO "Python workaround: ");
235 val &= ~PRG_CL_RESET_VALID;
236 out_be32(chip_regs + 0xf6030, val);
238 * We must read it back for changes to
241 val = in_be32(chip_regs + 0xf6030);
242 printk("reg0: %x\n", val);
248 void __init init_pci_config_tokens (void)
250 read_pci_config = rtas_token("read-pci-config");
251 write_pci_config = rtas_token("write-pci-config");
252 ibm_read_pci_config = rtas_token("ibm,read-pci-config");
253 ibm_write_pci_config = rtas_token("ibm,write-pci-config");
256 unsigned long __devinit get_phb_buid (struct device_node *phb)
259 unsigned int *buid_vals;
263 if (ibm_read_pci_config == -1) return 0;
265 /* PHB's will always be children of the root node,
266 * or so it is promised by the current firmware. */
267 if (phb->parent == NULL)
269 if (phb->parent->parent)
272 buid_vals = (unsigned int *) get_property(phb, "reg", &len);
273 if (buid_vals == NULL)
276 addr_cells = prom_n_addr_cells(phb);
277 if (addr_cells == 1) {
278 buid = (unsigned long) buid_vals[0];
280 buid = (((unsigned long)buid_vals[0]) << 32UL) |
281 (((unsigned long)buid_vals[1]) & 0xffffffff);
286 static int phb_set_bus_ranges(struct device_node *dev,
287 struct pci_controller *phb)
292 bus_range = (int *) get_property(dev, "bus-range", &len);
293 if (bus_range == NULL || len < 2 * sizeof(int)) {
297 phb->first_busno = bus_range[0];
298 phb->last_busno = bus_range[1];
303 static int __devinit setup_phb(struct device_node *dev,
304 struct pci_controller *phb,
305 unsigned int addr_size_words)
307 pci_setup_pci_controller(phb);
310 python_countermeasures(dev, addr_size_words);
312 if (phb_set_bus_ranges(dev, phb))
315 phb->arch_data = dev;
316 phb->ops = &rtas_pci_ops;
317 phb->buid = get_phb_buid(dev);
322 static void __devinit add_linux_pci_domain(struct device_node *dev,
323 struct pci_controller *phb,
324 struct property *of_prop)
326 memset(of_prop, 0, sizeof(struct property));
327 of_prop->name = "linux,pci-domain";
328 of_prop->length = sizeof(phb->global_number);
329 of_prop->value = (unsigned char *)&of_prop[1];
330 memcpy(of_prop->value, &phb->global_number, sizeof(phb->global_number));
331 prom_add_property(dev, of_prop);
334 static struct pci_controller * __init alloc_phb(struct device_node *dev,
335 unsigned int addr_size_words)
337 struct pci_controller *phb;
338 struct property *of_prop;
340 phb = alloc_bootmem(sizeof(struct pci_controller));
344 of_prop = alloc_bootmem(sizeof(struct property) +
345 sizeof(phb->global_number));
349 if (setup_phb(dev, phb, addr_size_words))
352 add_linux_pci_domain(dev, phb, of_prop);
357 static struct pci_controller * __devinit alloc_phb_dynamic(struct device_node *dev, unsigned int addr_size_words)
359 struct pci_controller *phb;
361 phb = (struct pci_controller *)kmalloc(sizeof(struct pci_controller),
366 if (setup_phb(dev, phb, addr_size_words))
371 /* TODO: linux,pci-domain? */
376 unsigned long __init find_and_init_phbs(void)
378 struct device_node *node;
379 struct pci_controller *phb;
380 unsigned int root_size_cells = 0;
382 unsigned int *opprop = NULL;
383 struct device_node *root = of_find_node_by_path("/");
385 if (ppc64_interrupt_controller == IC_OPEN_PIC) {
386 opprop = (unsigned int *)get_property(root,
387 "platform-open-pic", NULL);
390 root_size_cells = prom_n_size_cells(root);
394 for (node = of_get_next_child(root, NULL);
396 node = of_get_next_child(root, node)) {
397 if (node->type == NULL || strcmp(node->type, "pci") != 0)
400 phb = alloc_phb(node, root_size_cells);
404 pci_process_bridge_OF_ranges(phb, node);
405 pci_setup_phb_io(phb, index == 0);
406 #ifdef CONFIG_PPC_PSERIES
407 if (ppc64_interrupt_controller == IC_OPEN_PIC && pSeries_mpic) {
408 int addr = root_size_cells * (index + 2) - 1;
409 mpic_assign_isu(pSeries_mpic, index, opprop[addr]);
419 * pci_probe_only and pci_assign_all_buses can be set via properties
425 prop = (int *)get_property(of_chosen, "linux,pci-probe-only",
428 pci_probe_only = *prop;
430 prop = (int *)get_property(of_chosen,
431 "linux,pci-assign-all-buses", NULL);
433 pci_assign_all_buses = *prop;
439 struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
441 struct device_node *root = of_find_node_by_path("/");
442 unsigned int root_size_cells = 0;
443 struct pci_controller *phb;
447 root_size_cells = prom_n_size_cells(root);
449 primary = list_empty(&hose_list);
450 phb = alloc_phb_dynamic(dn, root_size_cells);
454 pci_process_bridge_OF_ranges(phb, dn);
456 pci_setup_phb_io_dynamic(phb, primary);
459 pci_devs_phb_init_dynamic(phb);
460 phb->last_busno = 0xff;
461 bus = pci_scan_bus(phb->first_busno, phb->ops, phb->arch_data);
463 phb->last_busno = bus->subordinate;
467 EXPORT_SYMBOL(init_phb_dynamic);
469 /* RPA-specific bits for removing PHBs */
470 int pcibios_remove_root_bus(struct pci_controller *phb)
472 struct pci_bus *b = phb->bus;
473 struct resource *res;
476 res = b->resource[0];
478 printk(KERN_ERR "%s: no IO resource for PHB %s\n", __FUNCTION__,
483 rc = unmap_bus_range(b);
485 printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
486 __FUNCTION__, b->name);
490 if (release_resource(res)) {
491 printk(KERN_ERR "%s: failed to release IO on bus %s\n",
492 __FUNCTION__, b->name);
496 for (i = 1; i < 3; ++i) {
497 res = b->resource[i];
498 if (!res->flags && i == 0) {
499 printk(KERN_ERR "%s: no MEM resource for PHB %s\n",
500 __FUNCTION__, b->name);
503 if (res->flags && release_resource(res)) {
505 "%s: failed to release IO %d on bus %s\n",
506 __FUNCTION__, i, b->name);
511 list_del(&phb->list_node);
517 EXPORT_SYMBOL(pcibios_remove_root_bus);