2 * Copyright (C) 2001 Dave Engebretsen, IBM Corporation
3 * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
5 * RTAS specific routines for PCI.
7 * Based on code from pci.c, chrp_pci.c and pSeries_pci.c
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include <linux/kernel.h>
25 #include <linux/threads.h>
26 #include <linux/pci.h>
27 #include <linux/string.h>
28 #include <linux/init.h>
29 #include <linux/bootmem.h>
32 #include <asm/pgtable.h>
35 #include <asm/machdep.h>
36 #include <asm/pci-bridge.h>
37 #include <asm/iommu.h>
40 #include <asm/ppc-pci.h>
43 static int read_pci_config;
44 static int write_pci_config;
45 static int ibm_read_pci_config;
46 static int ibm_write_pci_config;
48 static inline int config_access_valid(struct pci_dn *dn, int where)
52 if (where < 4096 && dn->pci_ext_config_space)
58 static int of_device_available(struct device_node * dn)
62 status = get_property(dn, "status", NULL);
67 if (!strcmp(status, "okay"))
73 int rtas_read_config(struct pci_dn *pdn, int where, int size, u32 *val)
76 unsigned long buid, addr;
80 return PCIBIOS_DEVICE_NOT_FOUND;
81 if (!config_access_valid(pdn, where))
82 return PCIBIOS_BAD_REGISTER_NUMBER;
84 addr = ((where & 0xf00) << 20) | (pdn->busno << 16) |
85 (pdn->devfn << 8) | (where & 0xff);
86 buid = pdn->phb->buid;
88 ret = rtas_call(ibm_read_pci_config, 4, 2, &returnval,
89 addr, BUID_HI(buid), BUID_LO(buid), size);
91 ret = rtas_call(read_pci_config, 2, 2, &returnval, addr, size);
96 return PCIBIOS_DEVICE_NOT_FOUND;
98 if (returnval == EEH_IO_ERROR_VALUE(size) &&
99 eeh_dn_check_failure (pdn->node, NULL))
100 return PCIBIOS_DEVICE_NOT_FOUND;
102 return PCIBIOS_SUCCESSFUL;
105 static int rtas_pci_read_config(struct pci_bus *bus,
107 int where, int size, u32 *val)
109 struct device_node *busdn, *dn;
112 busdn = pci_device_to_OF_node(bus->self);
114 busdn = bus->sysdata; /* must be a phb */
116 /* Search only direct children of the bus */
117 for (dn = busdn->child; dn; dn = dn->sibling) {
118 struct pci_dn *pdn = PCI_DN(dn);
119 if (pdn && pdn->devfn == devfn
120 && of_device_available(dn))
121 return rtas_read_config(pdn, where, size, val);
124 return PCIBIOS_DEVICE_NOT_FOUND;
127 int rtas_write_config(struct pci_dn *pdn, int where, int size, u32 val)
129 unsigned long buid, addr;
133 return PCIBIOS_DEVICE_NOT_FOUND;
134 if (!config_access_valid(pdn, where))
135 return PCIBIOS_BAD_REGISTER_NUMBER;
137 addr = ((where & 0xf00) << 20) | (pdn->busno << 16) |
138 (pdn->devfn << 8) | (where & 0xff);
139 buid = pdn->phb->buid;
141 ret = rtas_call(ibm_write_pci_config, 5, 1, NULL, addr,
142 BUID_HI(buid), BUID_LO(buid), size, (ulong) val);
144 ret = rtas_call(write_pci_config, 3, 1, NULL, addr, size, (ulong)val);
148 return PCIBIOS_DEVICE_NOT_FOUND;
150 return PCIBIOS_SUCCESSFUL;
153 static int rtas_pci_write_config(struct pci_bus *bus,
155 int where, int size, u32 val)
157 struct device_node *busdn, *dn;
160 busdn = pci_device_to_OF_node(bus->self);
162 busdn = bus->sysdata; /* must be a phb */
164 /* Search only direct children of the bus */
165 for (dn = busdn->child; dn; dn = dn->sibling) {
166 struct pci_dn *pdn = PCI_DN(dn);
167 if (pdn && pdn->devfn == devfn
168 && of_device_available(dn))
169 return rtas_write_config(pdn, where, size, val);
171 return PCIBIOS_DEVICE_NOT_FOUND;
174 struct pci_ops rtas_pci_ops = {
175 rtas_pci_read_config,
176 rtas_pci_write_config
179 int is_python(struct device_node *dev)
181 char *model = (char *)get_property(dev, "model", NULL);
183 if (model && strstr(model, "Python"))
189 static void python_countermeasures(struct device_node *dev)
191 struct resource registers;
192 void __iomem *chip_regs;
195 if (of_address_to_resource(dev, 0, ®isters)) {
196 printk(KERN_ERR "Can't get address for Python workarounds !\n");
200 /* Python's register file is 1 MB in size. */
201 chip_regs = ioremap(registers.start & ~(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 int __devinit setup_phb(struct device_node *dev, struct pci_controller *phb)
284 python_countermeasures(dev);
286 if (phb_set_bus_ranges(dev, phb))
289 phb->ops = &rtas_pci_ops;
290 phb->buid = get_phb_buid(dev);
295 unsigned long __init find_and_init_phbs(void)
297 struct device_node *node;
298 struct pci_controller *phb;
300 unsigned int root_size_cells = 0;
301 unsigned int *opprop = NULL;
302 struct device_node *root = of_find_node_by_path("/");
304 if (ppc64_interrupt_controller == IC_OPEN_PIC) {
305 opprop = (unsigned int *)get_property(root,
306 "platform-open-pic", NULL);
309 root_size_cells = prom_n_size_cells(root);
313 for (node = of_get_next_child(root, NULL);
315 node = of_get_next_child(root, node)) {
316 if (node->type == NULL || strcmp(node->type, "pci") != 0)
319 phb = pcibios_alloc_controller(node);
322 setup_phb(node, phb);
323 pci_process_bridge_OF_ranges(phb, node, 0);
324 pci_setup_phb_io(phb, index == 0);
325 #ifdef CONFIG_PPC_PSERIES
326 /* XXX This code need serious fixing ... --BenH */
327 if (ppc64_interrupt_controller == IC_OPEN_PIC && pSeries_mpic) {
328 int addr = root_size_cells * (index + 2) - 1;
329 mpic_assign_isu(pSeries_mpic, index, opprop[addr]);
339 * pci_probe_only and pci_assign_all_buses can be set via properties
345 prop = (int *)get_property(of_chosen, "linux,pci-probe-only",
348 pci_probe_only = *prop;
350 prop = (int *)get_property(of_chosen,
351 "linux,pci-assign-all-buses", NULL);
353 pci_assign_all_buses = *prop;
359 /* RPA-specific bits for removing PHBs */
360 int pcibios_remove_root_bus(struct pci_controller *phb)
362 struct pci_bus *b = phb->bus;
363 struct resource *res;
366 res = b->resource[0];
368 printk(KERN_ERR "%s: no IO resource for PHB %s\n", __FUNCTION__,
373 rc = unmap_bus_range(b);
375 printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
376 __FUNCTION__, b->name);
380 if (release_resource(res)) {
381 printk(KERN_ERR "%s: failed to release IO on bus %s\n",
382 __FUNCTION__, b->name);
386 for (i = 1; i < 3; ++i) {
387 res = b->resource[i];
388 if (!res->flags && i == 0) {
389 printk(KERN_ERR "%s: no MEM resource for PHB %s\n",
390 __FUNCTION__, b->name);
393 if (res->flags && release_resource(res)) {
395 "%s: failed to release IO %d on bus %s\n",
396 __FUNCTION__, i, b->name);
401 list_del(&phb->list_node);
402 pcibios_free_controller(phb);
406 EXPORT_SYMBOL(pcibios_remove_root_bus);