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 device_node *dn, int where)
55 if (where < 4096 && dn->pci_ext_config_space)
61 static int rtas_read_config(struct device_node *dn, int where, int size, u32 *val)
64 unsigned long buid, addr;
68 return PCIBIOS_DEVICE_NOT_FOUND;
69 if (!config_access_valid(dn, where))
70 return PCIBIOS_BAD_REGISTER_NUMBER;
72 addr = ((where & 0xf00) << 20) | (dn->busno << 16) |
73 (dn->devfn << 8) | (where & 0xff);
76 ret = rtas_call(ibm_read_pci_config, 4, 2, &returnval,
77 addr, buid >> 32, buid & 0xffffffff, size);
79 ret = rtas_call(read_pci_config, 2, 2, &returnval, addr, size);
84 return PCIBIOS_DEVICE_NOT_FOUND;
86 if (returnval == EEH_IO_ERROR_VALUE(size)
87 && eeh_dn_check_failure (dn, NULL))
88 return PCIBIOS_DEVICE_NOT_FOUND;
90 return PCIBIOS_SUCCESSFUL;
93 static int rtas_pci_read_config(struct pci_bus *bus,
95 int where, int size, u32 *val)
97 struct device_node *busdn, *dn;
100 busdn = pci_device_to_OF_node(bus->self);
102 busdn = bus->sysdata; /* must be a phb */
104 /* Search only direct children of the bus */
105 for (dn = busdn->child; dn; dn = dn->sibling)
106 if (dn->devfn == devfn)
107 return rtas_read_config(dn, where, size, val);
108 return PCIBIOS_DEVICE_NOT_FOUND;
111 static int rtas_write_config(struct device_node *dn, int where, int size, u32 val)
113 unsigned long buid, addr;
117 return PCIBIOS_DEVICE_NOT_FOUND;
118 if (!config_access_valid(dn, where))
119 return PCIBIOS_BAD_REGISTER_NUMBER;
121 addr = ((where & 0xf00) << 20) | (dn->busno << 16) |
122 (dn->devfn << 8) | (where & 0xff);
123 buid = dn->phb->buid;
125 ret = rtas_call(ibm_write_pci_config, 5, 1, NULL, addr, buid >> 32, buid & 0xffffffff, size, (ulong) val);
127 ret = rtas_call(write_pci_config, 3, 1, NULL, addr, size, (ulong)val);
131 return PCIBIOS_DEVICE_NOT_FOUND;
133 return PCIBIOS_SUCCESSFUL;
136 static int rtas_pci_write_config(struct pci_bus *bus,
138 int where, int size, u32 val)
140 struct device_node *busdn, *dn;
143 busdn = pci_device_to_OF_node(bus->self);
145 busdn = bus->sysdata; /* must be a phb */
147 /* Search only direct children of the bus */
148 for (dn = busdn->child; dn; dn = dn->sibling)
149 if (dn->devfn == devfn)
150 return rtas_write_config(dn, where, size, val);
151 return PCIBIOS_DEVICE_NOT_FOUND;
154 struct pci_ops rtas_pci_ops = {
155 rtas_pci_read_config,
156 rtas_pci_write_config
159 int is_python(struct device_node *dev)
161 char *model = (char *)get_property(dev, "model", NULL);
163 if (model && strstr(model, "Python"))
169 static int get_phb_reg_prop(struct device_node *dev,
170 unsigned int addr_size_words,
171 struct reg_property64 *reg)
173 unsigned int *ui_ptr = NULL, len;
175 /* Found a PHB, now figure out where his registers are mapped. */
176 ui_ptr = (unsigned int *)get_property(dev, "reg", &len);
180 if (addr_size_words == 1) {
181 reg->address = ((struct reg_property32 *)ui_ptr)->address;
182 reg->size = ((struct reg_property32 *)ui_ptr)->size;
184 *reg = *((struct reg_property64 *)ui_ptr);
190 static void python_countermeasures(struct device_node *dev,
191 unsigned int addr_size_words)
193 struct reg_property64 reg_struct;
194 void __iomem *chip_regs;
197 if (get_phb_reg_prop(dev, addr_size_words, ®_struct))
200 /* Python's register file is 1 MB in size. */
201 chip_regs = ioremap(reg_struct.address & ~(0xfffffUL), 0x100000);
204 * Firmware doesn't always clear this bit which is critical
205 * for good performance - Anton
208 #define PRG_CL_RESET_VALID 0x00010000
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);
216 * We must read it back for changes to
219 val = in_be32(chip_regs + 0xf6030);
220 printk("reg0: %x\n", val);
226 void __init init_pci_config_tokens (void)
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");
234 unsigned long __devinit get_phb_buid (struct device_node *phb)
237 unsigned int *buid_vals;
241 if (ibm_read_pci_config == -1) return 0;
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)
247 if (phb->parent->parent)
250 buid_vals = (unsigned int *) get_property(phb, "reg", &len);
251 if (buid_vals == NULL)
254 addr_cells = prom_n_addr_cells(phb);
255 if (addr_cells == 1) {
256 buid = (unsigned long) buid_vals[0];
258 buid = (((unsigned long)buid_vals[0]) << 32UL) |
259 (((unsigned long)buid_vals[1]) & 0xffffffff);
264 static int phb_set_bus_ranges(struct device_node *dev,
265 struct pci_controller *phb)
270 bus_range = (int *) get_property(dev, "bus-range", &len);
271 if (bus_range == NULL || len < 2 * sizeof(int)) {
275 phb->first_busno = bus_range[0];
276 phb->last_busno = bus_range[1];
281 static int __devinit setup_phb(struct device_node *dev,
282 struct pci_controller *phb,
283 unsigned int addr_size_words)
285 pci_setup_pci_controller(phb);
288 python_countermeasures(dev, addr_size_words);
290 if (phb_set_bus_ranges(dev, phb))
293 phb->arch_data = dev;
294 phb->ops = &rtas_pci_ops;
295 phb->buid = get_phb_buid(dev);
300 static void __devinit add_linux_pci_domain(struct device_node *dev,
301 struct pci_controller *phb,
302 struct property *of_prop)
304 memset(of_prop, 0, sizeof(struct property));
305 of_prop->name = "linux,pci-domain";
306 of_prop->length = sizeof(phb->global_number);
307 of_prop->value = (unsigned char *)&of_prop[1];
308 memcpy(of_prop->value, &phb->global_number, sizeof(phb->global_number));
309 prom_add_property(dev, of_prop);
312 static struct pci_controller * __init alloc_phb(struct device_node *dev,
313 unsigned int addr_size_words)
315 struct pci_controller *phb;
316 struct property *of_prop;
318 phb = alloc_bootmem(sizeof(struct pci_controller));
322 of_prop = alloc_bootmem(sizeof(struct property) +
323 sizeof(phb->global_number));
327 if (setup_phb(dev, phb, addr_size_words))
330 add_linux_pci_domain(dev, phb, of_prop);
335 static struct pci_controller * __devinit alloc_phb_dynamic(struct device_node *dev, unsigned int addr_size_words)
337 struct pci_controller *phb;
339 phb = (struct pci_controller *)kmalloc(sizeof(struct pci_controller),
344 if (setup_phb(dev, phb, addr_size_words))
349 /* TODO: linux,pci-domain? */
354 unsigned long __init find_and_init_phbs(void)
356 struct device_node *node;
357 struct pci_controller *phb;
358 unsigned int root_size_cells = 0;
360 unsigned int *opprop = NULL;
361 struct device_node *root = of_find_node_by_path("/");
363 if (ppc64_interrupt_controller == IC_OPEN_PIC) {
364 opprop = (unsigned int *)get_property(root,
365 "platform-open-pic", NULL);
368 root_size_cells = prom_n_size_cells(root);
372 for (node = of_get_next_child(root, NULL);
374 node = of_get_next_child(root, node)) {
375 if (node->type == NULL || strcmp(node->type, "pci") != 0)
378 phb = alloc_phb(node, root_size_cells);
382 pci_process_bridge_OF_ranges(phb, node);
383 pci_setup_phb_io(phb, index == 0);
384 #ifdef CONFIG_PPC_PSERIES
385 if (ppc64_interrupt_controller == IC_OPEN_PIC && pSeries_mpic) {
386 int addr = root_size_cells * (index + 2) - 1;
387 mpic_assign_isu(pSeries_mpic, index, opprop[addr]);
397 * pci_probe_only and pci_assign_all_buses can be set via properties
403 prop = (int *)get_property(of_chosen, "linux,pci-probe-only",
406 pci_probe_only = *prop;
408 prop = (int *)get_property(of_chosen,
409 "linux,pci-assign-all-buses", NULL);
411 pci_assign_all_buses = *prop;
417 struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
419 struct device_node *root = of_find_node_by_path("/");
420 unsigned int root_size_cells = 0;
421 struct pci_controller *phb;
425 root_size_cells = prom_n_size_cells(root);
427 primary = list_empty(&hose_list);
428 phb = alloc_phb_dynamic(dn, root_size_cells);
432 pci_process_bridge_OF_ranges(phb, dn);
434 pci_setup_phb_io_dynamic(phb, primary);
437 pci_devs_phb_init_dynamic(phb);
438 phb->last_busno = 0xff;
439 bus = pci_scan_bus(phb->first_busno, phb->ops, phb->arch_data);
441 phb->last_busno = bus->subordinate;
445 EXPORT_SYMBOL(init_phb_dynamic);
447 /* RPA-specific bits for removing PHBs */
448 int pcibios_remove_root_bus(struct pci_controller *phb)
450 struct pci_bus *b = phb->bus;
451 struct resource *res;
454 res = b->resource[0];
456 printk(KERN_ERR "%s: no IO resource for PHB %s\n", __FUNCTION__,
461 rc = unmap_bus_range(b);
463 printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
464 __FUNCTION__, b->name);
468 if (release_resource(res)) {
469 printk(KERN_ERR "%s: failed to release IO on bus %s\n",
470 __FUNCTION__, b->name);
474 for (i = 1; i < 3; ++i) {
475 res = b->resource[i];
476 if (!res->flags && i == 0) {
477 printk(KERN_ERR "%s: no MEM resource for PHB %s\n",
478 __FUNCTION__, b->name);
481 if (res->flags && release_resource(res)) {
483 "%s: failed to release IO %d on bus %s\n",
484 __FUNCTION__, i, b->name);
489 list_del(&phb->list_node);
495 EXPORT_SYMBOL(pcibios_remove_root_bus);