2 * AMD Family 10h mmconfig enablement
5 #include <linux/types.h>
7 #include <linux/string.h>
10 #include <asm/pci-direct.h>
11 #include <linux/sort.h>
15 #include <asm/mmconfig.h>
16 #include <asm/pci_x86.h>
18 struct pci_hostbridge_probe {
25 static u64 __cpuinitdata fam10h_pci_mmconf_base;
26 static int __cpuinitdata fam10h_pci_mmconf_base_status;
28 static struct pci_hostbridge_probe pci_probes[] __cpuinitdata = {
29 { 0, 0x18, PCI_VENDOR_ID_AMD, 0x1200 },
30 { 0xff, 0, PCI_VENDOR_ID_AMD, 0x1200 },
38 static int __cpuinit cmp_range(const void *x1, const void *x2)
40 const struct range *r1 = x1;
41 const struct range *r2 = x2;
44 start1 = r1->start >> 32;
45 start2 = r2->start >> 32;
47 return start1 - start2;
51 /* need to avoid (0xfd<<32) and (0xfe<<32), ht used space */
52 #define FAM10H_PCI_MMCONF_BASE (0xfcULL<<32)
53 #define BASE_VALID(b) ((b != (0xfdULL << 32)) && (b != (0xfeULL << 32)))
54 static void __cpuinit get_fam10h_pci_mmconf_base(void)
64 u64 base = FAM10H_PCI_MMCONF_BASE;
67 struct range range[8];
69 /* only try to get setting from BSP */
71 if (fam10h_pci_mmconf_base_status)
74 if (!early_pci_allowed())
78 for (i = 0; i < ARRAY_SIZE(pci_probes); i++) {
83 bus = pci_probes[i].bus;
84 slot = pci_probes[i].slot;
85 id = read_pci_config(bus, slot, 0, PCI_VENDOR_ID);
88 device = (id>>16) & 0xffff;
89 if (pci_probes[i].vendor == vendor &&
90 pci_probes[i].device == device) {
100 address = MSR_K8_SYSCFG;
101 rdmsrl(address, val);
103 /* TOP_MEM2 is not enabled? */
104 if (!(val & (1<<21))) {
108 address = MSR_K8_TOP_MEM2;
109 rdmsrl(address, val);
110 tom2 = val & (0xffffULL<<32);
114 base = tom2 + (1ULL<<32);
117 * need to check if the range is in the high mmio range that is
121 for (i = 0; i < 8; i++) {
125 reg = read_pci_config(bus, slot, 1, 0x80 + (i << 3));
129 start = (((u64)reg) << 8) & (0xffULL << 32); /* 39:16 on 31:8*/
130 reg = read_pci_config(bus, slot, 1, 0x84 + (i << 3));
131 end = (((u64)reg) << 8) & (0xffULL << 32); /* 39:16 on 31:8*/
136 range[hi_mmio_num].start = start;
137 range[hi_mmio_num].end = end;
145 sort(range, hi_mmio_num, sizeof(struct range), cmp_range, NULL);
147 if (range[hi_mmio_num - 1].end < base)
149 if (range[0].start > base)
152 /* need to find one window */
153 base = range[0].start - (1ULL << 32);
154 if ((base > tom2) && BASE_VALID(base))
156 base = range[hi_mmio_num - 1].end + (1ULL << 32);
157 if ((base > tom2) && BASE_VALID(base))
159 /* need to find window between ranges */
161 for (i = 0; i < hi_mmio_num - 1; i++) {
162 if (range[i + 1].start > (range[i].end + (1ULL << 32))) {
163 base = range[i].end + (1ULL << 32);
164 if ((base > tom2) && BASE_VALID(base))
170 fam10h_pci_mmconf_base_status = -1;
173 fam10h_pci_mmconf_base = base;
174 fam10h_pci_mmconf_base_status = 1;
177 void __cpuinit fam10h_check_enable_mmcfg(void)
182 if (!(pci_probe & PCI_CHECK_ENABLE_AMD_MMCONF))
185 address = MSR_FAM10H_MMIO_CONF_BASE;
186 rdmsrl(address, val);
188 /* try to make sure that AP's setting is identical to BSP setting */
189 if (val & FAM10H_MMIO_CONF_ENABLE) {
191 busnbits = (val >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) &
192 FAM10H_MMIO_CONF_BUSRANGE_MASK;
194 /* only trust the one handle 256 buses, if acpi=off */
195 if (!acpi_pci_disabled || busnbits >= 8) {
197 base = val & (0xffffULL << 32);
198 if (fam10h_pci_mmconf_base_status <= 0) {
199 fam10h_pci_mmconf_base = base;
200 fam10h_pci_mmconf_base_status = 1;
202 } else if (fam10h_pci_mmconf_base == base)
208 * if it is not enabled, try to enable it and assume only one segment
211 get_fam10h_pci_mmconf_base();
212 if (fam10h_pci_mmconf_base_status <= 0)
215 printk(KERN_INFO "Enable MMCONFIG on AMD Family 10h\n");
216 val &= ~((FAM10H_MMIO_CONF_BASE_MASK<<FAM10H_MMIO_CONF_BASE_SHIFT) |
217 (FAM10H_MMIO_CONF_BUSRANGE_MASK<<FAM10H_MMIO_CONF_BUSRANGE_SHIFT));
218 val |= fam10h_pci_mmconf_base | (8 << FAM10H_MMIO_CONF_BUSRANGE_SHIFT) |
219 FAM10H_MMIO_CONF_ENABLE;
220 wrmsrl(address, val);
223 static int __devinit set_check_enable_amd_mmconf(const struct dmi_system_id *d)
225 pci_probe |= PCI_CHECK_ENABLE_AMD_MMCONF;
229 static const struct dmi_system_id __cpuinitconst mmconf_dmi_table[] = {
231 .callback = set_check_enable_amd_mmconf,
232 .ident = "Sun Microsystems Machine",
234 DMI_MATCH(DMI_SYS_VENDOR, "Sun Microsystems"),
240 void __cpuinit check_enable_amd_mmconf_dmi(void)
242 dmi_check_system(mmconf_dmi_table);