4 * Copyright (C) 2001 Dave Engebretsen, IBM Corporation
5 * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
7 * pSeries specific routines for PCI.
9 * Based on code from pci.c and chrp_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 s7a_workaround;
53 extern struct mpic *pSeries_mpic;
55 static int rtas_read_config(struct device_node *dn, int where, int size, u32 *val)
58 unsigned long buid, addr;
62 return PCIBIOS_DEVICE_NOT_FOUND;
63 if (where & (size - 1))
64 return PCIBIOS_BAD_REGISTER_NUMBER;
66 addr = (dn->busno << 16) | (dn->devfn << 8) | where;
69 ret = rtas_call(ibm_read_pci_config, 4, 2, &returnval,
70 addr, buid >> 32, buid & 0xffffffff, size);
72 ret = rtas_call(read_pci_config, 2, 2, &returnval, addr, size);
77 return PCIBIOS_DEVICE_NOT_FOUND;
79 if (returnval == EEH_IO_ERROR_VALUE(size)
80 && eeh_dn_check_failure (dn, NULL))
81 return PCIBIOS_DEVICE_NOT_FOUND;
83 return PCIBIOS_SUCCESSFUL;
86 static int rtas_pci_read_config(struct pci_bus *bus,
88 int where, int size, u32 *val)
90 struct device_node *busdn, *dn;
93 busdn = pci_device_to_OF_node(bus->self);
95 busdn = bus->sysdata; /* must be a phb */
97 /* Search only direct children of the bus */
98 for (dn = busdn->child; dn; dn = dn->sibling)
99 if (dn->devfn == devfn)
100 return rtas_read_config(dn, where, size, val);
101 return PCIBIOS_DEVICE_NOT_FOUND;
104 static int rtas_write_config(struct device_node *dn, int where, int size, u32 val)
106 unsigned long buid, addr;
110 return PCIBIOS_DEVICE_NOT_FOUND;
111 if (where & (size - 1))
112 return PCIBIOS_BAD_REGISTER_NUMBER;
114 addr = (dn->busno << 16) | (dn->devfn << 8) | where;
115 buid = dn->phb->buid;
117 ret = rtas_call(ibm_write_pci_config, 5, 1, NULL, addr, buid >> 32, buid & 0xffffffff, size, (ulong) val);
119 ret = rtas_call(write_pci_config, 3, 1, NULL, addr, size, (ulong)val);
123 return PCIBIOS_DEVICE_NOT_FOUND;
125 return PCIBIOS_SUCCESSFUL;
128 static int rtas_pci_write_config(struct pci_bus *bus,
130 int where, int size, u32 val)
132 struct device_node *busdn, *dn;
135 busdn = pci_device_to_OF_node(bus->self);
137 busdn = bus->sysdata; /* must be a phb */
139 /* Search only direct children of the bus */
140 for (dn = busdn->child; dn; dn = dn->sibling)
141 if (dn->devfn == devfn)
142 return rtas_write_config(dn, where, size, val);
143 return PCIBIOS_DEVICE_NOT_FOUND;
146 struct pci_ops rtas_pci_ops = {
147 rtas_pci_read_config,
148 rtas_pci_write_config
151 int is_python(struct device_node *dev)
153 char *model = (char *)get_property(dev, "model", NULL);
155 if (model && strstr(model, "Python"))
161 static int get_phb_reg_prop(struct device_node *dev,
162 unsigned int addr_size_words,
163 struct reg_property64 *reg)
165 unsigned int *ui_ptr = NULL, len;
167 /* Found a PHB, now figure out where his registers are mapped. */
168 ui_ptr = (unsigned int *)get_property(dev, "reg", &len);
172 if (addr_size_words == 1) {
173 reg->address = ((struct reg_property32 *)ui_ptr)->address;
174 reg->size = ((struct reg_property32 *)ui_ptr)->size;
176 *reg = *((struct reg_property64 *)ui_ptr);
182 static void python_countermeasures(struct device_node *dev,
183 unsigned int addr_size_words)
185 struct reg_property64 reg_struct;
186 void __iomem *chip_regs;
189 if (get_phb_reg_prop(dev, addr_size_words, ®_struct))
192 /* Python's register file is 1 MB in size. */
193 chip_regs = ioremap(reg_struct.address & ~(0xfffffUL), 0x100000);
196 * Firmware doesn't always clear this bit which is critical
197 * for good performance - Anton
200 #define PRG_CL_RESET_VALID 0x00010000
202 val = in_be32(chip_regs + 0xf6030);
203 if (val & PRG_CL_RESET_VALID) {
204 printk(KERN_INFO "Python workaround: ");
205 val &= ~PRG_CL_RESET_VALID;
206 out_be32(chip_regs + 0xf6030, val);
208 * We must read it back for changes to
211 val = in_be32(chip_regs + 0xf6030);
212 printk("reg0: %x\n", val);
218 void __init init_pci_config_tokens (void)
220 read_pci_config = rtas_token("read-pci-config");
221 write_pci_config = rtas_token("write-pci-config");
222 ibm_read_pci_config = rtas_token("ibm,read-pci-config");
223 ibm_write_pci_config = rtas_token("ibm,write-pci-config");
226 unsigned long __devinit get_phb_buid (struct device_node *phb)
229 unsigned int *buid_vals;
233 if (ibm_read_pci_config == -1) return 0;
235 /* PHB's will always be children of the root node,
236 * or so it is promised by the current firmware. */
237 if (phb->parent == NULL)
239 if (phb->parent->parent)
242 buid_vals = (unsigned int *) get_property(phb, "reg", &len);
243 if (buid_vals == NULL)
246 addr_cells = prom_n_addr_cells(phb);
247 if (addr_cells == 1) {
248 buid = (unsigned long) buid_vals[0];
250 buid = (((unsigned long)buid_vals[0]) << 32UL) |
251 (((unsigned long)buid_vals[1]) & 0xffffffff);
256 static int phb_set_bus_ranges(struct device_node *dev,
257 struct pci_controller *phb)
262 bus_range = (int *) get_property(dev, "bus-range", &len);
263 if (bus_range == NULL || len < 2 * sizeof(int)) {
267 phb->first_busno = bus_range[0];
268 phb->last_busno = bus_range[1];
273 static int __devinit setup_phb(struct device_node *dev,
274 struct pci_controller *phb,
275 unsigned int addr_size_words)
277 pci_setup_pci_controller(phb);
280 python_countermeasures(dev, addr_size_words);
282 if (phb_set_bus_ranges(dev, phb))
285 phb->arch_data = dev;
286 phb->ops = &rtas_pci_ops;
287 phb->buid = get_phb_buid(dev);
292 static void __devinit add_linux_pci_domain(struct device_node *dev,
293 struct pci_controller *phb,
294 struct property *of_prop)
296 memset(of_prop, 0, sizeof(struct property));
297 of_prop->name = "linux,pci-domain";
298 of_prop->length = sizeof(phb->global_number);
299 of_prop->value = (unsigned char *)&of_prop[1];
300 memcpy(of_prop->value, &phb->global_number, sizeof(phb->global_number));
301 prom_add_property(dev, of_prop);
304 static struct pci_controller * __init alloc_phb(struct device_node *dev,
305 unsigned int addr_size_words)
307 struct pci_controller *phb;
308 struct property *of_prop;
310 phb = alloc_bootmem(sizeof(struct pci_controller));
314 of_prop = alloc_bootmem(sizeof(struct property) +
315 sizeof(phb->global_number));
319 if (setup_phb(dev, phb, addr_size_words))
322 add_linux_pci_domain(dev, phb, of_prop);
327 static struct pci_controller * __devinit alloc_phb_dynamic(struct device_node *dev, unsigned int addr_size_words)
329 struct pci_controller *phb;
331 phb = (struct pci_controller *)kmalloc(sizeof(struct pci_controller),
336 if (setup_phb(dev, phb, addr_size_words))
341 /* TODO: linux,pci-domain? */
346 unsigned long __init find_and_init_phbs(void)
348 struct device_node *node;
349 struct pci_controller *phb;
350 unsigned int root_size_cells = 0;
352 unsigned int *opprop = NULL;
353 struct device_node *root = of_find_node_by_path("/");
355 if (ppc64_interrupt_controller == IC_OPEN_PIC) {
356 opprop = (unsigned int *)get_property(root,
357 "platform-open-pic", NULL);
360 root_size_cells = prom_n_size_cells(root);
364 for (node = of_get_next_child(root, NULL);
366 node = of_get_next_child(root, node)) {
367 if (node->type == NULL || strcmp(node->type, "pci") != 0)
370 phb = alloc_phb(node, root_size_cells);
374 pci_process_bridge_OF_ranges(phb, node);
375 pci_setup_phb_io(phb, index == 0);
377 if (ppc64_interrupt_controller == IC_OPEN_PIC && pSeries_mpic) {
378 int addr = root_size_cells * (index + 2) - 1;
379 mpic_assign_isu(pSeries_mpic, index, opprop[addr]);
389 * pci_probe_only and pci_assign_all_buses can be set via properties
395 prop = (int *)get_property(of_chosen, "linux,pci-probe-only",
398 pci_probe_only = *prop;
400 prop = (int *)get_property(of_chosen,
401 "linux,pci-assign-all-buses", NULL);
403 pci_assign_all_buses = *prop;
409 struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
411 struct device_node *root = of_find_node_by_path("/");
412 unsigned int root_size_cells = 0;
413 struct pci_controller *phb;
416 root_size_cells = prom_n_size_cells(root);
418 phb = alloc_phb_dynamic(dn, root_size_cells);
422 pci_process_bridge_OF_ranges(phb, dn);
424 pci_setup_phb_io_dynamic(phb);
427 pci_devs_phb_init_dynamic(phb);
428 phb->last_busno = 0xff;
429 bus = pci_scan_bus(phb->first_busno, phb->ops, phb->arch_data);
431 phb->last_busno = bus->subordinate;
435 EXPORT_SYMBOL(init_phb_dynamic);
438 void pcibios_name_device(struct pci_dev *dev)
440 struct device_node *dn;
443 * Add IBM loc code (slot) as a prefix to the device names for service
445 dn = pci_device_to_OF_node(dev);
447 char *loc_code = get_property(dn, "ibm,loc-code", 0);
449 int loc_len = strlen(loc_code);
450 if (loc_len < sizeof(dev->dev.name)) {
451 memmove(dev->dev.name+loc_len+1, dev->dev.name,
452 sizeof(dev->dev.name)-loc_len-1);
453 memcpy(dev->dev.name, loc_code, loc_len);
454 dev->dev.name[loc_len] = ' ';
455 dev->dev.name[sizeof(dev->dev.name)-1] = '\0';
460 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_name_device);
463 static void check_s7a(void)
465 struct device_node *root;
468 root = of_find_node_by_path("/");
470 model = get_property(root, "model", NULL);
471 if (model && !strcmp(model, "IBM,7013-S7A"))
477 /* RPA-specific bits for removing PHBs */
478 int pcibios_remove_root_bus(struct pci_controller *phb)
480 struct pci_bus *b = phb->bus;
481 struct resource *res;
484 res = b->resource[0];
486 printk(KERN_ERR "%s: no IO resource for PHB %s\n", __FUNCTION__,
491 rc = unmap_bus_range(b);
493 printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
494 __FUNCTION__, b->name);
498 if (release_resource(res)) {
499 printk(KERN_ERR "%s: failed to release IO on bus %s\n",
500 __FUNCTION__, b->name);
504 for (i = 1; i < 3; ++i) {
505 res = b->resource[i];
506 if (!res->flags && i == 0) {
507 printk(KERN_ERR "%s: no MEM resource for PHB %s\n",
508 __FUNCTION__, b->name);
511 if (res->flags && release_resource(res)) {
513 "%s: failed to release IO %d on bus %s\n",
514 __FUNCTION__, i, b->name);
519 list_del(&phb->list_node);
525 EXPORT_SYMBOL(pcibios_remove_root_bus);
527 static void __init pSeries_request_regions(void)
529 request_region(0x20,0x20,"pic1");
530 request_region(0xa0,0x20,"pic2");
531 request_region(0x00,0x20,"dma1");
532 request_region(0x40,0x20,"timer");
533 request_region(0x80,0x10,"dma page reg");
534 request_region(0xc0,0x20,"dma2");
537 void __init pSeries_final_fixup(void)
539 struct pci_dev *dev = NULL;
543 for_each_pci_dev(dev) {
544 pci_read_irq_line(dev);
545 if (s7a_workaround) {
548 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
554 pSeries_request_regions();
556 pci_addr_cache_build();
560 * Assume the winbond 82c105 is the IDE controller on a
561 * p610. We should probably be more careful in case
562 * someone tries to plug in a similar adapter.
564 static void fixup_winbond_82c105(struct pci_dev* dev)
569 if (!(systemcfg->platform & PLATFORM_PSERIES))
572 printk("Using INTC for W82c105 IDE controller.\n");
573 pci_read_config_dword(dev, 0x40, ®);
574 /* Enable LEGIRQ to use INTC instead of ISA interrupts */
575 pci_write_config_dword(dev, 0x40, reg | (1<<11));
577 for (i = 0; i < DEVICE_COUNT_RESOURCE; ++i) {
578 /* zap the 2nd function of the winbond chip */
579 if (dev->resource[i].flags & IORESOURCE_IO
580 && dev->bus->number == 0 && dev->devfn == 0x81)
581 dev->resource[i].flags &= ~IORESOURCE_IO;
584 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105,
585 fixup_winbond_82c105);