1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
/* (c) 2005 Linux Networx GPL see COPYING for details */
#include <console/console.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <device/pcix.h>
static void pcix_tune_dev(device_t dev)
{
unsigned cap;
unsigned status, orig_cmd, cmd;
unsigned max_read, max_tran;
if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL) {
return;
}
cap = pci_find_capability(dev, PCI_CAP_ID_PCIX);
if (!cap) {
return;
}
printk_debug("%s PCI-X tuning\n", dev_path(dev));
status = pci_read_config32(dev, cap + PCI_X_STATUS);
orig_cmd = cmd = pci_read_config16(dev,cap + PCI_X_CMD);
max_read = (status & PCI_X_STATUS_MAX_READ) >> 21;
max_tran = (status & PCI_X_STATUS_MAX_SPLIT) >> 23;
if (max_read != ((cmd & PCI_X_CMD_MAX_READ) >> 2)) {
cmd &= ~PCI_X_CMD_MAX_READ;
cmd |= max_read << 2;
}
if (max_tran != ((cmd & PCI_X_CMD_MAX_SPLIT) >> 4)) {
cmd &= ~PCI_X_CMD_MAX_SPLIT;
cmd |= max_tran << 4;
}
/* Don't attempt to handle PCI-X errors */
cmd &= ~PCI_X_CMD_DPERR_E;
/* Enable Relaxed Ordering */
cmd |= PCI_X_CMD_ERO;
if (orig_cmd != cmd) {
pci_write_config16(dev, cap + PCI_X_CMD, cmd);
}
}
unsigned int pcix_scan_bus(struct bus *bus,
unsigned min_devfn, unsigned max_devfn, unsigned int max)
{
device_t child;
max = pci_scan_bus(bus, min_devfn, max_devfn, max);
for(child = bus->children; child; child = child->sibling) {
if ( (child->path.u.pci.devfn < min_devfn) ||
(child->path.u.pci.devfn > max_devfn))
{
continue;
}
pcix_tune_dev(child);
}
return max;
}
const char *pcix_speed(unsigned sstatus)
{
static const char conventional[] = "Conventional PCI";
static const char pcix_66mhz[] = "66MHz PCI-X";
static const char pcix_100mhz[] = "100MHz PCI-X";
static const char pcix_133mhz[] = "133MHz PCI-X";
static const char pcix_266mhz[] = "266MHz PCI-X";
static const char pcix_533mhz[] = "533MHZ PCI-X";
static const char unknown[] = "Unknown";
const char *result;
result = unknown;
switch(PCI_X_SSTATUS_MFREQ(sstatus)) {
case PCI_X_SSTATUS_CONVENTIONAL_PCI:
result = conventional;
break;
case PCI_X_SSTATUS_MODE1_66MHZ:
result = pcix_66mhz;
break;
case PCI_X_SSTATUS_MODE1_100MHZ:
result = pcix_100mhz;
break;
case PCI_X_SSTATUS_MODE1_133MHZ:
result = pcix_133mhz;
break;
case PCI_X_SSTATUS_MODE2_266MHZ_REF_66MHZ:
case PCI_X_SSTATUS_MODE2_266MHZ_REF_100MHZ:
case PCI_X_SSTATUS_MODE2_266MHZ_REF_133MHZ:
result = pcix_266mhz;
break;
case PCI_X_SSTATUS_MODE2_533MHZ_REF_66MHZ:
case PCI_X_SSTATUS_MODE2_533MHZ_REF_100MHZ:
case PCI_X_SSTATUS_MODE2_533MHZ_REF_133MHZ:
result = pcix_533mhz;
break;
}
return result;
}
unsigned int pcix_scan_bridge(device_t dev, unsigned int max)
{
unsigned pos;
unsigned sstatus;
/* Find the PCI-X capability */
pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
sstatus = pci_read_config16(dev, pos + PCI_X_SEC_STATUS);
if (PCI_X_SSTATUS_MFREQ(sstatus) == PCI_X_SSTATUS_CONVENTIONAL_PCI) {
max = do_pci_scan_bridge(dev, max, pci_scan_bus);
} else {
max = do_pci_scan_bridge(dev, max, pcix_scan_bus);
}
/* Print the PCI-X bus speed */
printk_debug("PCI: %02x: %s\n", dev->link[0].secondary, pcix_speed(sstatus));
return max;
}
/** Default device operations for PCI-X bridges */
static struct pci_operations pcix_bus_ops_pci = {
.set_subsystem = 0,
};
struct device_operations default_pcix_ops_bus = {
.read_resources = pci_bus_read_resources,
.set_resources = pci_dev_set_resources,
.enable_resources = pci_bus_enable_resources,
.init = 0,
.scan_bus = pcix_scan_bridge,
.enable = 0,
.reset_bus = pci_bus_reset,
.ops_pci = &pcix_bus_ops_pci,
};
|
