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>
44
static int read_pci_config;
45
static int write_pci_config;
46
static int ibm_read_pci_config;
47
static int ibm_write_pci_config;
49
static inline int config_access_valid(struct pci_dn *dn, int where)
53
if (where < 4096 && dn->pci_ext_config_space)
59
int rtas_read_config(struct pci_dn *pdn, int where, int size, u32 *val)
62
unsigned long buid, addr;
66
return PCIBIOS_DEVICE_NOT_FOUND;
67
if (!config_access_valid(pdn, where))
68
return PCIBIOS_BAD_REGISTER_NUMBER;
70
addr = rtas_config_addr(pdn->busno, pdn->devfn, where);
71
buid = pdn->phb->buid;
73
ret = rtas_call(ibm_read_pci_config, 4, 2, &returnval,
74
addr, BUID_HI(buid), BUID_LO(buid), size);
76
ret = rtas_call(read_pci_config, 2, 2, &returnval, addr, size);
81
return PCIBIOS_DEVICE_NOT_FOUND;
83
if (returnval == EEH_IO_ERROR_VALUE(size) &&
84
eeh_dn_check_failure (pdn->node, NULL))
85
return PCIBIOS_DEVICE_NOT_FOUND;
87
return PCIBIOS_SUCCESSFUL;
90
static int rtas_pci_read_config(struct pci_bus *bus,
92
int where, int size, u32 *val)
94
struct device_node *busdn, *dn;
96
busdn = pci_bus_to_OF_node(bus);
98
/* Search only direct children of the bus */
99
for (dn = busdn->child; dn; dn = dn->sibling) {
100
struct pci_dn *pdn = PCI_DN(dn);
101
if (pdn && pdn->devfn == devfn
102
&& of_device_is_available(dn))
103
return rtas_read_config(pdn, where, size, val);
106
return PCIBIOS_DEVICE_NOT_FOUND;
109
int rtas_write_config(struct pci_dn *pdn, int where, int size, u32 val)
111
unsigned long buid, addr;
115
return PCIBIOS_DEVICE_NOT_FOUND;
116
if (!config_access_valid(pdn, where))
117
return PCIBIOS_BAD_REGISTER_NUMBER;
119
addr = rtas_config_addr(pdn->busno, pdn->devfn, where);
120
buid = pdn->phb->buid;
122
ret = rtas_call(ibm_write_pci_config, 5, 1, NULL, addr,
123
BUID_HI(buid), BUID_LO(buid), size, (ulong) val);
125
ret = rtas_call(write_pci_config, 3, 1, NULL, addr, size, (ulong)val);
129
return PCIBIOS_DEVICE_NOT_FOUND;
131
return PCIBIOS_SUCCESSFUL;
134
static int rtas_pci_write_config(struct pci_bus *bus,
136
int where, int size, u32 val)
138
struct device_node *busdn, *dn;
140
busdn = pci_bus_to_OF_node(bus);
142
/* Search only direct children of the bus */
143
for (dn = busdn->child; dn; dn = dn->sibling) {
144
struct pci_dn *pdn = PCI_DN(dn);
145
if (pdn && pdn->devfn == devfn
146
&& of_device_is_available(dn))
147
return rtas_write_config(pdn, where, size, val);
149
return PCIBIOS_DEVICE_NOT_FOUND;
152
static struct pci_ops rtas_pci_ops = {
153
.read = rtas_pci_read_config,
154
.write = rtas_pci_write_config,
157
static int is_python(struct device_node *dev)
159
const char *model = of_get_property(dev, "model", NULL);
161
if (model && strstr(model, "Python"))
167
static void python_countermeasures(struct device_node *dev)
169
struct resource registers;
170
void __iomem *chip_regs;
173
if (of_address_to_resource(dev, 0, ®isters)) {
174
printk(KERN_ERR "Can't get address for Python workarounds !\n");
178
/* Python's register file is 1 MB in size. */
179
chip_regs = ioremap(registers.start & ~(0xfffffUL), 0x100000);
182
* Firmware doesn't always clear this bit which is critical
183
* for good performance - Anton
186
#define PRG_CL_RESET_VALID 0x00010000
188
val = in_be32(chip_regs + 0xf6030);
189
if (val & PRG_CL_RESET_VALID) {
190
printk(KERN_INFO "Python workaround: ");
191
val &= ~PRG_CL_RESET_VALID;
192
out_be32(chip_regs + 0xf6030, val);
194
* We must read it back for changes to
197
val = in_be32(chip_regs + 0xf6030);
198
printk("reg0: %x\n", val);
204
void __init init_pci_config_tokens (void)
206
read_pci_config = rtas_token("read-pci-config");
207
write_pci_config = rtas_token("write-pci-config");
208
ibm_read_pci_config = rtas_token("ibm,read-pci-config");
209
ibm_write_pci_config = rtas_token("ibm,write-pci-config");
212
unsigned long __devinit get_phb_buid (struct device_node *phb)
216
if (ibm_read_pci_config == -1)
218
if (of_address_to_resource(phb, 0, &r))
223
static int phb_set_bus_ranges(struct device_node *dev,
224
struct pci_controller *phb)
226
const int *bus_range;
229
bus_range = of_get_property(dev, "bus-range", &len);
230
if (bus_range == NULL || len < 2 * sizeof(int)) {
234
phb->first_busno = bus_range[0];
235
phb->last_busno = bus_range[1];
240
int __devinit rtas_setup_phb(struct pci_controller *phb)
242
struct device_node *dev = phb->dn;
245
python_countermeasures(dev);
247
if (phb_set_bus_ranges(dev, phb))
250
phb->ops = &rtas_pci_ops;
251
phb->buid = get_phb_buid(dev);
256
void __init find_and_init_phbs(void)
258
struct device_node *node;
259
struct pci_controller *phb;
260
struct device_node *root = of_find_node_by_path("/");
262
for_each_child_of_node(root, node) {
263
if (node->type == NULL || (strcmp(node->type, "pci") != 0 &&
264
strcmp(node->type, "pciex") != 0))
267
phb = pcibios_alloc_controller(node);
271
pci_process_bridge_OF_ranges(phb, node, 0);
272
isa_bridge_find_early(phb);
279
* pci_probe_only and pci_assign_all_buses can be set via properties
285
prop = of_get_property(of_chosen,
286
"linux,pci-probe-only", NULL);
288
pci_probe_only = *prop;
290
#ifdef CONFIG_PPC32 /* Will be made generic soon */
291
prop = of_get_property(of_chosen,
292
"linux,pci-assign-all-buses", NULL);
294
pci_add_flags(PCI_REASSIGN_ALL_BUS);
295
#endif /* CONFIG_PPC32 */