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 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;
83 return PCIBIOS_DEVICE_NOT_FOUND;
84 if (!config_access_valid(dn, where))
85 return PCIBIOS_BAD_REGISTER_NUMBER;
87 addr = ((where & 0xf00) << 20) | (dn->busno << 16) |
88 (dn->devfn << 8) | (where & 0xff);
91 ret = rtas_call(ibm_read_pci_config, 4, 2, &returnval,
92 addr, buid >> 32, buid & 0xffffffff, size);
94 ret = rtas_call(read_pci_config, 2, 2, &returnval, addr, size);
99 return PCIBIOS_DEVICE_NOT_FOUND;
101 if (returnval == EEH_IO_ERROR_VALUE(size)
102 && eeh_dn_check_failure (dn, NULL))
103 return PCIBIOS_DEVICE_NOT_FOUND;
105 return PCIBIOS_SUCCESSFUL;
108 static int rtas_pci_read_config(struct pci_bus *bus,
110 int where, int size, u32 *val)
112 struct device_node *busdn, *dn;
115 busdn = pci_device_to_OF_node(bus->self);
117 busdn = bus->sysdata; /* must be a phb */
119 /* Search only direct children of the bus */
120 for (dn = busdn->child; dn; dn = dn->sibling)
121 if (dn->devfn == devfn && of_device_available(dn))
122 return rtas_read_config(dn, where, size, val);
123 return PCIBIOS_DEVICE_NOT_FOUND;
126 static int rtas_write_config(struct device_node *dn, int where, int size, u32 val)
128 unsigned long buid, addr;
132 return PCIBIOS_DEVICE_NOT_FOUND;
133 if (!config_access_valid(dn, where))
134 return PCIBIOS_BAD_REGISTER_NUMBER;
136 addr = ((where & 0xf00) << 20) | (dn->busno << 16) |
137 (dn->devfn << 8) | (where & 0xff);
138 buid = dn->phb->buid;
140 ret = rtas_call(ibm_write_pci_config, 5, 1, NULL, addr, buid >> 32, buid & 0xffffffff, size, (ulong) val);
142 ret = rtas_call(write_pci_config, 3, 1, NULL, addr, size, (ulong)val);
146 return PCIBIOS_DEVICE_NOT_FOUND;
148 return PCIBIOS_SUCCESSFUL;
151 static int rtas_pci_write_config(struct pci_bus *bus,
153 int where, int size, u32 val)
155 struct device_node *busdn, *dn;
158 busdn = pci_device_to_OF_node(bus->self);
160 busdn = bus->sysdata; /* must be a phb */
162 /* Search only direct children of the bus */
163 for (dn = busdn->child; dn; dn = dn->sibling)
164 if (dn->devfn == devfn && of_device_available(dn))
165 return rtas_write_config(dn, where, size, val);
166 return PCIBIOS_DEVICE_NOT_FOUND;
169 struct pci_ops rtas_pci_ops = {
170 rtas_pci_read_config,
171 rtas_pci_write_config
174 int is_python(struct device_node *dev)
176 char *model = (char *)get_property(dev, "model", NULL);
178 if (model && strstr(model, "Python"))
184 static int get_phb_reg_prop(struct device_node *dev,
185 unsigned int addr_size_words,
186 struct reg_property64 *reg)
188 unsigned int *ui_ptr = NULL, len;
190 /* Found a PHB, now figure out where his registers are mapped. */
191 ui_ptr = (unsigned int *)get_property(dev, "reg", &len);
195 if (addr_size_words == 1) {
196 reg->address = ((struct reg_property32 *)ui_ptr)->address;
197 reg->size = ((struct reg_property32 *)ui_ptr)->size;
199 *reg = *((struct reg_property64 *)ui_ptr);
205 static void python_countermeasures(struct device_node *dev,
206 unsigned int addr_size_words)
208 struct reg_property64 reg_struct;
209 void __iomem *chip_regs;
212 if (get_phb_reg_prop(dev, addr_size_words, ®_struct))
215 /* Python's register file is 1 MB in size. */
216 chip_regs = ioremap(reg_struct.address & ~(0xfffffUL), 0x100000);
219 * Firmware doesn't always clear this bit which is critical
220 * for good performance - Anton
223 #define PRG_CL_RESET_VALID 0x00010000
225 val = in_be32(chip_regs + 0xf6030);
226 if (val & PRG_CL_RESET_VALID) {
227 printk(KERN_INFO "Python workaround: ");
228 val &= ~PRG_CL_RESET_VALID;
229 out_be32(chip_regs + 0xf6030, val);
231 * We must read it back for changes to
234 val = in_be32(chip_regs + 0xf6030);
235 printk("reg0: %x\n", val);
241 void __init init_pci_config_tokens (void)
243 read_pci_config = rtas_token("read-pci-config");
244 write_pci_config = rtas_token("write-pci-config");
245 ibm_read_pci_config = rtas_token("ibm,read-pci-config");
246 ibm_write_pci_config = rtas_token("ibm,write-pci-config");
249 unsigned long __devinit get_phb_buid (struct device_node *phb)
252 unsigned int *buid_vals;
256 if (ibm_read_pci_config == -1) return 0;
258 /* PHB's will always be children of the root node,
259 * or so it is promised by the current firmware. */
260 if (phb->parent == NULL)
262 if (phb->parent->parent)
265 buid_vals = (unsigned int *) get_property(phb, "reg", &len);
266 if (buid_vals == NULL)
269 addr_cells = prom_n_addr_cells(phb);
270 if (addr_cells == 1) {
271 buid = (unsigned long) buid_vals[0];
273 buid = (((unsigned long)buid_vals[0]) << 32UL) |
274 (((unsigned long)buid_vals[1]) & 0xffffffff);
279 static int phb_set_bus_ranges(struct device_node *dev,
280 struct pci_controller *phb)
285 bus_range = (int *) get_property(dev, "bus-range", &len);
286 if (bus_range == NULL || len < 2 * sizeof(int)) {
290 phb->first_busno = bus_range[0];
291 phb->last_busno = bus_range[1];
296 static int __devinit setup_phb(struct device_node *dev,
297 struct pci_controller *phb,
298 unsigned int addr_size_words)
300 pci_setup_pci_controller(phb);
303 python_countermeasures(dev, addr_size_words);
305 if (phb_set_bus_ranges(dev, phb))
308 phb->arch_data = dev;
309 phb->ops = &rtas_pci_ops;
310 phb->buid = get_phb_buid(dev);
315 static void __devinit add_linux_pci_domain(struct device_node *dev,
316 struct pci_controller *phb,
317 struct property *of_prop)
319 memset(of_prop, 0, sizeof(struct property));
320 of_prop->name = "linux,pci-domain";
321 of_prop->length = sizeof(phb->global_number);
322 of_prop->value = (unsigned char *)&of_prop[1];
323 memcpy(of_prop->value, &phb->global_number, sizeof(phb->global_number));
324 prom_add_property(dev, of_prop);
327 static struct pci_controller * __init alloc_phb(struct device_node *dev,
328 unsigned int addr_size_words)
330 struct pci_controller *phb;
331 struct property *of_prop;
333 phb = alloc_bootmem(sizeof(struct pci_controller));
337 of_prop = alloc_bootmem(sizeof(struct property) +
338 sizeof(phb->global_number));
342 if (setup_phb(dev, phb, addr_size_words))
345 add_linux_pci_domain(dev, phb, of_prop);
350 static struct pci_controller * __devinit alloc_phb_dynamic(struct device_node *dev, unsigned int addr_size_words)
352 struct pci_controller *phb;
354 phb = (struct pci_controller *)kmalloc(sizeof(struct pci_controller),
359 if (setup_phb(dev, phb, addr_size_words))
364 /* TODO: linux,pci-domain? */
369 unsigned long __init find_and_init_phbs(void)
371 struct device_node *node;
372 struct pci_controller *phb;
373 unsigned int root_size_cells = 0;
375 unsigned int *opprop = NULL;
376 struct device_node *root = of_find_node_by_path("/");
378 if (ppc64_interrupt_controller == IC_OPEN_PIC) {
379 opprop = (unsigned int *)get_property(root,
380 "platform-open-pic", NULL);
383 root_size_cells = prom_n_size_cells(root);
387 for (node = of_get_next_child(root, NULL);
389 node = of_get_next_child(root, node)) {
390 if (node->type == NULL || strcmp(node->type, "pci") != 0)
393 phb = alloc_phb(node, root_size_cells);
397 pci_process_bridge_OF_ranges(phb, node);
398 pci_setup_phb_io(phb, index == 0);
399 #ifdef CONFIG_PPC_PSERIES
400 if (ppc64_interrupt_controller == IC_OPEN_PIC && pSeries_mpic) {
401 int addr = root_size_cells * (index + 2) - 1;
402 mpic_assign_isu(pSeries_mpic, index, opprop[addr]);
412 * pci_probe_only and pci_assign_all_buses can be set via properties
418 prop = (int *)get_property(of_chosen, "linux,pci-probe-only",
421 pci_probe_only = *prop;
423 prop = (int *)get_property(of_chosen,
424 "linux,pci-assign-all-buses", NULL);
426 pci_assign_all_buses = *prop;
432 struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
434 struct device_node *root = of_find_node_by_path("/");
435 unsigned int root_size_cells = 0;
436 struct pci_controller *phb;
440 root_size_cells = prom_n_size_cells(root);
442 primary = list_empty(&hose_list);
443 phb = alloc_phb_dynamic(dn, root_size_cells);
447 pci_process_bridge_OF_ranges(phb, dn);
449 pci_setup_phb_io_dynamic(phb, primary);
452 pci_devs_phb_init_dynamic(phb);
453 phb->last_busno = 0xff;
454 bus = pci_scan_bus(phb->first_busno, phb->ops, phb->arch_data);
456 phb->last_busno = bus->subordinate;
460 EXPORT_SYMBOL(init_phb_dynamic);
462 /* RPA-specific bits for removing PHBs */
463 int pcibios_remove_root_bus(struct pci_controller *phb)
465 struct pci_bus *b = phb->bus;
466 struct resource *res;
469 res = b->resource[0];
471 printk(KERN_ERR "%s: no IO resource for PHB %s\n", __FUNCTION__,
476 rc = unmap_bus_range(b);
478 printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
479 __FUNCTION__, b->name);
483 if (release_resource(res)) {
484 printk(KERN_ERR "%s: failed to release IO on bus %s\n",
485 __FUNCTION__, b->name);
489 for (i = 1; i < 3; ++i) {
490 res = b->resource[i];
491 if (!res->flags && i == 0) {
492 printk(KERN_ERR "%s: no MEM resource for PHB %s\n",
493 __FUNCTION__, b->name);
496 if (res->flags && release_resource(res)) {
498 "%s: failed to release IO %d on bus %s\n",
499 __FUNCTION__, i, b->name);
504 list_del(&phb->list_node);
510 EXPORT_SYMBOL(pcibios_remove_root_bus);