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 inline 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 int rtas_read_config(struct pci_dn *pdn, int where, int size, u32 *val)
78 unsigned long buid, addr;
82 return PCIBIOS_DEVICE_NOT_FOUND;
83 if (!config_access_valid(pdn, where))
84 return PCIBIOS_BAD_REGISTER_NUMBER;
86 addr = ((where & 0xf00) << 20) | (pdn->busno << 16) |
87 (pdn->devfn << 8) | (where & 0xff);
88 buid = pdn->phb->buid;
90 ret = rtas_call(ibm_read_pci_config, 4, 2, &returnval,
91 addr, BUID_HI(buid), BUID_LO(buid), size);
93 ret = rtas_call(read_pci_config, 2, 2, &returnval, addr, size);
98 return PCIBIOS_DEVICE_NOT_FOUND;
100 if (returnval == EEH_IO_ERROR_VALUE(size) &&
101 eeh_dn_check_failure (pdn->node, NULL))
102 return PCIBIOS_DEVICE_NOT_FOUND;
104 return PCIBIOS_SUCCESSFUL;
107 static int rtas_pci_read_config(struct pci_bus *bus,
109 int where, int size, u32 *val)
111 struct device_node *busdn, *dn;
114 busdn = pci_device_to_OF_node(bus->self);
116 busdn = bus->sysdata; /* must be a phb */
118 /* Search only direct children of the bus */
119 for (dn = busdn->child; dn; dn = dn->sibling) {
120 struct pci_dn *pdn = PCI_DN(dn);
121 if (pdn && pdn->devfn == devfn
122 && of_device_available(dn))
123 return rtas_read_config(pdn, where, size, val);
126 return PCIBIOS_DEVICE_NOT_FOUND;
129 int rtas_write_config(struct pci_dn *pdn, int where, int size, u32 val)
131 unsigned long buid, addr;
135 return PCIBIOS_DEVICE_NOT_FOUND;
136 if (!config_access_valid(pdn, where))
137 return PCIBIOS_BAD_REGISTER_NUMBER;
139 addr = ((where & 0xf00) << 20) | (pdn->busno << 16) |
140 (pdn->devfn << 8) | (where & 0xff);
141 buid = pdn->phb->buid;
143 ret = rtas_call(ibm_write_pci_config, 5, 1, NULL, addr,
144 BUID_HI(buid), BUID_LO(buid), size, (ulong) val);
146 ret = rtas_call(write_pci_config, 3, 1, NULL, addr, size, (ulong)val);
150 return PCIBIOS_DEVICE_NOT_FOUND;
152 return PCIBIOS_SUCCESSFUL;
155 static int rtas_pci_write_config(struct pci_bus *bus,
157 int where, int size, u32 val)
159 struct device_node *busdn, *dn;
162 busdn = pci_device_to_OF_node(bus->self);
164 busdn = bus->sysdata; /* must be a phb */
166 /* Search only direct children of the bus */
167 for (dn = busdn->child; dn; dn = dn->sibling) {
168 struct pci_dn *pdn = PCI_DN(dn);
169 if (pdn && pdn->devfn == devfn
170 && of_device_available(dn))
171 return rtas_write_config(pdn, 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 void python_countermeasures(struct device_node *dev)
193 struct resource registers;
194 void __iomem *chip_regs;
197 if (of_address_to_resource(dev, 0, ®isters)) {
198 printk(KERN_ERR "Can't get address for Python workarounds !\n");
202 /* Python's register file is 1 MB in size. */
203 chip_regs = ioremap(registers.start & ~(0xfffffUL), 0x100000);
206 * Firmware doesn't always clear this bit which is critical
207 * for good performance - Anton
210 #define PRG_CL_RESET_VALID 0x00010000
212 val = in_be32(chip_regs + 0xf6030);
213 if (val & PRG_CL_RESET_VALID) {
214 printk(KERN_INFO "Python workaround: ");
215 val &= ~PRG_CL_RESET_VALID;
216 out_be32(chip_regs + 0xf6030, val);
218 * We must read it back for changes to
221 val = in_be32(chip_regs + 0xf6030);
222 printk("reg0: %x\n", val);
228 void __init init_pci_config_tokens (void)
230 read_pci_config = rtas_token("read-pci-config");
231 write_pci_config = rtas_token("write-pci-config");
232 ibm_read_pci_config = rtas_token("ibm,read-pci-config");
233 ibm_write_pci_config = rtas_token("ibm,write-pci-config");
236 unsigned long __devinit get_phb_buid (struct device_node *phb)
239 unsigned int *buid_vals;
243 if (ibm_read_pci_config == -1) return 0;
245 /* PHB's will always be children of the root node,
246 * or so it is promised by the current firmware. */
247 if (phb->parent == NULL)
249 if (phb->parent->parent)
252 buid_vals = (unsigned int *) get_property(phb, "reg", &len);
253 if (buid_vals == NULL)
256 addr_cells = prom_n_addr_cells(phb);
257 if (addr_cells == 1) {
258 buid = (unsigned long) buid_vals[0];
260 buid = (((unsigned long)buid_vals[0]) << 32UL) |
261 (((unsigned long)buid_vals[1]) & 0xffffffff);
266 static int phb_set_bus_ranges(struct device_node *dev,
267 struct pci_controller *phb)
272 bus_range = (int *) get_property(dev, "bus-range", &len);
273 if (bus_range == NULL || len < 2 * sizeof(int)) {
277 phb->first_busno = bus_range[0];
278 phb->last_busno = bus_range[1];
283 int __devinit setup_phb(struct device_node *dev, struct pci_controller *phb)
286 python_countermeasures(dev);
288 if (phb_set_bus_ranges(dev, phb))
291 phb->ops = &rtas_pci_ops;
292 phb->buid = get_phb_buid(dev);
297 unsigned long __init find_and_init_phbs(void)
299 struct device_node *node;
300 struct pci_controller *phb;
302 unsigned int root_size_cells = 0;
303 unsigned int *opprop = NULL;
304 struct device_node *root = of_find_node_by_path("/");
306 if (ppc64_interrupt_controller == IC_OPEN_PIC) {
307 opprop = (unsigned int *)get_property(root,
308 "platform-open-pic", NULL);
311 root_size_cells = prom_n_size_cells(root);
315 for (node = of_get_next_child(root, NULL);
317 node = of_get_next_child(root, node)) {
318 if (node->type == NULL || strcmp(node->type, "pci") != 0)
321 phb = pcibios_alloc_controller(node);
324 setup_phb(node, phb);
325 pci_process_bridge_OF_ranges(phb, node, 0);
326 pci_setup_phb_io(phb, index == 0);
327 #ifdef CONFIG_PPC_PSERIES
328 /* XXX This code need serious fixing ... --BenH */
329 if (ppc64_interrupt_controller == IC_OPEN_PIC && pSeries_mpic) {
330 int addr = root_size_cells * (index + 2) - 1;
331 mpic_assign_isu(pSeries_mpic, index, opprop[addr]);
341 * pci_probe_only and pci_assign_all_buses can be set via properties
347 prop = (int *)get_property(of_chosen, "linux,pci-probe-only",
350 pci_probe_only = *prop;
352 prop = (int *)get_property(of_chosen,
353 "linux,pci-assign-all-buses", NULL);
355 pci_assign_all_buses = *prop;
361 /* RPA-specific bits for removing PHBs */
362 int pcibios_remove_root_bus(struct pci_controller *phb)
364 struct pci_bus *b = phb->bus;
365 struct resource *res;
368 res = b->resource[0];
370 printk(KERN_ERR "%s: no IO resource for PHB %s\n", __FUNCTION__,
375 rc = unmap_bus_range(b);
377 printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
378 __FUNCTION__, b->name);
382 if (release_resource(res)) {
383 printk(KERN_ERR "%s: failed to release IO on bus %s\n",
384 __FUNCTION__, b->name);
388 for (i = 1; i < 3; ++i) {
389 res = b->resource[i];
390 if (!res->flags && i == 0) {
391 printk(KERN_ERR "%s: no MEM resource for PHB %s\n",
392 __FUNCTION__, b->name);
395 if (res->flags && release_resource(res)) {
397 "%s: failed to release IO %d on bus %s\n",
398 __FUNCTION__, i, b->name);
403 list_del(&phb->list_node);
404 pcibios_free_controller(phb);
408 EXPORT_SYMBOL(pcibios_remove_root_bus);