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
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
#include <console/console.h>
#include <arch/io.h>
#include <stdint.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <stdlib.h>
#include <string.h>
#include "northbridge.h"
#include <cpu/amd/gx1def.h>
#include <cpu/x86/cache.h>
#include <cpu/cpu.h>
#define NORTHBRIDGE_FILE "northbridge.c"
/*
*/
static void optimize_xbus(device_t dev)
{
/* Optimise X-Bus performance */
pci_write_config8(dev, 0x40, 0x1e);
pci_write_config8(dev, 0x41, 0x52);
pci_write_config8(dev, 0x43, 0xc1);
pci_write_config8(dev, 0x44, 0x00);
}
/**
* Enables memory from 0xC0000 up to 0xFFFFF.
* So this region is read/write and cache able
*
* FIXME: What about PCI master access into
* this region?
**/
static void enable_shadow(device_t dev)
{
write32(GX_BASE+BC_XMAP_2, 0x77777777);
write32(GX_BASE+BC_XMAP_3, 0x77777777);
}
static void northbridge_init(device_t dev)
{
printk(BIOS_DEBUG, "northbridge: %s()\n", __func__);
optimize_xbus(dev);
enable_shadow(dev);
printk(BIOS_SPEW, "Calling enable_cache()\n");
enable_cache();
}
static struct device_operations northbridge_operations = {
.read_resources = pci_dev_read_resources,
.set_resources = pci_dev_set_resources,
.enable_resources = pci_dev_enable_resources,
.init = northbridge_init,
.enable = 0,
.ops_pci = 0,
};
static const struct pci_driver northbridge_driver __pci_driver = {
.ops = &northbridge_operations,
.vendor = PCI_VENDOR_ID_CYRIX,
.device = PCI_DEVICE_ID_CYRIX_PCI_MASTER,
};
#if CONFIG_WRITE_HIGH_TABLES
#include <cbmem.h>
#endif
static void pci_domain_set_resources(device_t dev)
{
device_t mc_dev;
uint32_t pci_tolm;
pci_tolm = find_pci_tolm(dev->link_list);
mc_dev = dev->link_list->children;
if (mc_dev) {
unsigned int tomk, tolmk;
unsigned int ramreg = 0;
int i, idx;
unsigned int *bcdramtop = (unsigned int *)(GX_BASE + BC_DRAM_TOP);
unsigned int *mcgbaseadd = (unsigned int *)(GX_BASE + MC_GBASE_ADD);
for(i=0; i<0x20; i+= 0x10) {
unsigned int *mcreg = (unsigned int *)(GX_BASE + MC_BANK_CFG);
unsigned int mem_config = *mcreg;
if (((mem_config & (DIMM_PG_SZ << i)) >> (4 + i)) == 7)
continue;
ramreg += 1 << (((mem_config & (DIMM_SZ << i)) >> (i + 8)) + 2);
}
tomk = ramreg << 10;
/* Sort out the framebuffer size */
tomk -= CONFIG_VIDEO_MB * 1024;
*bcdramtop = ((tomk << 10) - 1);
*mcgbaseadd = (tomk >> 9);
printk(BIOS_DEBUG, "BC_DRAM_TOP = 0x%08x\n", *bcdramtop);
printk(BIOS_DEBUG, "MC_GBASE_ADD = 0x%08x\n", *mcgbaseadd);
printk(BIOS_DEBUG, "I would set ram size to %d Mbytes\n", (tomk >> 10));
/* Compute the top of Low memory */
tolmk = pci_tolm >> 10;
if (tolmk >= tomk) {
/* The PCI hole does does not overlap the memory.
*/
tolmk = tomk;
}
#if CONFIG_WRITE_HIGH_TABLES
/* Leave some space for ACPI, PIRQ and MP tables */
high_tables_base = (tolmk * 1024) - HIGH_MEMORY_SIZE;
high_tables_size = HIGH_MEMORY_SIZE;
#endif
/* Report the memory regions */
idx = 10;
ram_resource(dev, idx++, 0, tolmk);
}
assign_resources(dev->link_list);
}
static struct device_operations pci_domain_ops = {
.read_resources = pci_domain_read_resources,
.set_resources = pci_domain_set_resources,
.enable_resources = NULL,
.init = NULL,
.scan_bus = pci_domain_scan_bus,
};
static void cpu_bus_init(device_t dev)
{
printk(BIOS_SPEW, "%s:%s()\n", NORTHBRIDGE_FILE, __func__);
initialize_cpus(dev->link_list);
}
static void cpu_bus_noop(device_t dev)
{
}
static struct device_operations cpu_bus_ops = {
.read_resources = cpu_bus_noop,
.set_resources = cpu_bus_noop,
.enable_resources = cpu_bus_noop,
.init = cpu_bus_init,
.scan_bus = 0,
};
static void enable_dev(struct device *dev)
{
printk(BIOS_SPEW, "%s:%s()\n", NORTHBRIDGE_FILE, __func__);
/* Set the operations if it is a special bus type */
if (dev->path.type == DEVICE_PATH_PCI_DOMAIN) {
printk(BIOS_SPEW, "DEVICE_PATH_PCI_DOMAIN\n");
dev->ops = &pci_domain_ops;
pci_set_method(dev);
}
else if (dev->path.type == DEVICE_PATH_APIC_CLUSTER) {
printk(BIOS_SPEW, "DEVICE_PATH_APIC_CLUSTER\n");
dev->ops = &cpu_bus_ops;
} else {
printk(BIOS_SPEW, "device path type %d\n",dev->path.type);
}
}
struct chip_operations northbridge_amd_gx1_ops = {
CHIP_NAME("AMD GX1 Northbridge")
.enable_dev = enable_dev,
};
|
