1 // SPDX-License-Identifier: GPL-2.0-only
3 * Shared support code for AMD K8 northbridges and derivates.
4 * Copyright 2006 Andi Kleen, SUSE Labs.
7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9 #include <linux/types.h>
10 #include <linux/slab.h>
11 #include <linux/init.h>
12 #include <linux/errno.h>
13 #include <linux/export.h>
14 #include <linux/spinlock.h>
15 #include <linux/pci_ids.h>
16 #include <asm/amd_nb.h>
18 #define PCI_DEVICE_ID_AMD_17H_ROOT 0x1450
19 #define PCI_DEVICE_ID_AMD_17H_M10H_ROOT 0x15d0
20 #define PCI_DEVICE_ID_AMD_17H_M30H_ROOT 0x1480
21 #define PCI_DEVICE_ID_AMD_17H_M60H_ROOT 0x1630
22 #define PCI_DEVICE_ID_AMD_17H_DF_F4 0x1464
23 #define PCI_DEVICE_ID_AMD_17H_M10H_DF_F4 0x15ec
24 #define PCI_DEVICE_ID_AMD_17H_M30H_DF_F4 0x1494
25 #define PCI_DEVICE_ID_AMD_17H_M60H_DF_F4 0x144c
26 #define PCI_DEVICE_ID_AMD_17H_M70H_DF_F4 0x1444
27 #define PCI_DEVICE_ID_AMD_19H_DF_F4 0x1654
29 /* Protect the PCI config register pairs used for SMN and DF indirect access. */
30 static DEFINE_MUTEX(smn_mutex);
32 static u32 *flush_words;
34 static const struct pci_device_id amd_root_ids[] = {
35 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_ROOT) },
36 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M10H_ROOT) },
37 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M30H_ROOT) },
38 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M60H_ROOT) },
43 #define PCI_DEVICE_ID_AMD_CNB17H_F4 0x1704
45 const struct pci_device_id amd_nb_misc_ids[] = {
46 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
47 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
48 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F3) },
49 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M10H_F3) },
50 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F3) },
51 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M60H_NB_F3) },
52 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_NB_F3) },
53 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F3) },
54 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_DF_F3) },
55 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M10H_DF_F3) },
56 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M30H_DF_F3) },
57 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M60H_DF_F3) },
58 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CNB17H_F3) },
59 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M70H_DF_F3) },
60 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_DF_F3) },
63 EXPORT_SYMBOL_GPL(amd_nb_misc_ids);
65 static const struct pci_device_id amd_nb_link_ids[] = {
66 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
67 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F4) },
68 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M60H_NB_F4) },
69 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_NB_F4) },
70 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F4) },
71 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_DF_F4) },
72 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M10H_DF_F4) },
73 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M30H_DF_F4) },
74 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M60H_DF_F4) },
75 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M70H_DF_F4) },
76 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_DF_F4) },
77 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CNB17H_F4) },
81 static const struct pci_device_id hygon_root_ids[] = {
82 { PCI_DEVICE(PCI_VENDOR_ID_HYGON, PCI_DEVICE_ID_AMD_17H_ROOT) },
86 static const struct pci_device_id hygon_nb_misc_ids[] = {
87 { PCI_DEVICE(PCI_VENDOR_ID_HYGON, PCI_DEVICE_ID_AMD_17H_DF_F3) },
91 static const struct pci_device_id hygon_nb_link_ids[] = {
92 { PCI_DEVICE(PCI_VENDOR_ID_HYGON, PCI_DEVICE_ID_AMD_17H_DF_F4) },
96 const struct amd_nb_bus_dev_range amd_nb_bus_dev_ranges[] __initconst = {
103 static struct amd_northbridge_info amd_northbridges;
107 return amd_northbridges.num;
109 EXPORT_SYMBOL_GPL(amd_nb_num);
111 bool amd_nb_has_feature(unsigned int feature)
113 return ((amd_northbridges.flags & feature) == feature);
115 EXPORT_SYMBOL_GPL(amd_nb_has_feature);
117 struct amd_northbridge *node_to_amd_nb(int node)
119 return (node < amd_northbridges.num) ? &amd_northbridges.nb[node] : NULL;
121 EXPORT_SYMBOL_GPL(node_to_amd_nb);
123 static struct pci_dev *next_northbridge(struct pci_dev *dev,
124 const struct pci_device_id *ids)
127 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
130 } while (!pci_match_id(ids, dev));
134 static int __amd_smn_rw(u16 node, u32 address, u32 *value, bool write)
136 struct pci_dev *root;
139 if (node >= amd_northbridges.num)
142 root = node_to_amd_nb(node)->root;
146 mutex_lock(&smn_mutex);
148 err = pci_write_config_dword(root, 0x60, address);
150 pr_warn("Error programming SMN address 0x%x.\n", address);
154 err = (write ? pci_write_config_dword(root, 0x64, *value)
155 : pci_read_config_dword(root, 0x64, value));
157 pr_warn("Error %s SMN address 0x%x.\n",
158 (write ? "writing to" : "reading from"), address);
161 mutex_unlock(&smn_mutex);
167 int amd_smn_read(u16 node, u32 address, u32 *value)
169 return __amd_smn_rw(node, address, value, false);
171 EXPORT_SYMBOL_GPL(amd_smn_read);
173 int amd_smn_write(u16 node, u32 address, u32 value)
175 return __amd_smn_rw(node, address, &value, true);
177 EXPORT_SYMBOL_GPL(amd_smn_write);
180 * Data Fabric Indirect Access uses FICAA/FICAD.
182 * Fabric Indirect Configuration Access Address (FICAA): Constructed based
183 * on the device's Instance Id and the PCI function and register offset of
184 * the desired register.
186 * Fabric Indirect Configuration Access Data (FICAD): There are FICAD LO
187 * and FICAD HI registers but so far we only need the LO register.
189 int amd_df_indirect_read(u16 node, u8 func, u16 reg, u8 instance_id, u32 *lo)
195 if (node >= amd_northbridges.num)
198 F4 = node_to_amd_nb(node)->link;
203 ficaa |= reg & 0x3FC;
204 ficaa |= (func & 0x7) << 11;
205 ficaa |= instance_id << 16;
207 mutex_lock(&smn_mutex);
209 err = pci_write_config_dword(F4, 0x5C, ficaa);
211 pr_warn("Error writing DF Indirect FICAA, FICAA=0x%x\n", ficaa);
215 err = pci_read_config_dword(F4, 0x98, lo);
217 pr_warn("Error reading DF Indirect FICAD LO, FICAA=0x%x.\n", ficaa);
220 mutex_unlock(&smn_mutex);
225 EXPORT_SYMBOL_GPL(amd_df_indirect_read);
227 int amd_cache_northbridges(void)
229 const struct pci_device_id *misc_ids = amd_nb_misc_ids;
230 const struct pci_device_id *link_ids = amd_nb_link_ids;
231 const struct pci_device_id *root_ids = amd_root_ids;
232 struct pci_dev *root, *misc, *link;
233 struct amd_northbridge *nb;
234 u16 roots_per_misc = 0;
239 if (amd_northbridges.num)
242 if (boot_cpu_data.x86_vendor == X86_VENDOR_HYGON) {
243 root_ids = hygon_root_ids;
244 misc_ids = hygon_nb_misc_ids;
245 link_ids = hygon_nb_link_ids;
249 while ((misc = next_northbridge(misc, misc_ids)) != NULL)
256 while ((root = next_northbridge(root, root_ids)) != NULL)
260 roots_per_misc = root_count / misc_count;
263 * There should be _exactly_ N roots for each DF/SMN
266 if (!roots_per_misc || (root_count % roots_per_misc)) {
267 pr_info("Unsupported AMD DF/PCI configuration found\n");
272 nb = kcalloc(misc_count, sizeof(struct amd_northbridge), GFP_KERNEL);
276 amd_northbridges.nb = nb;
277 amd_northbridges.num = misc_count;
279 link = misc = root = NULL;
280 for (i = 0; i < amd_northbridges.num; i++) {
281 node_to_amd_nb(i)->root = root =
282 next_northbridge(root, root_ids);
283 node_to_amd_nb(i)->misc = misc =
284 next_northbridge(misc, misc_ids);
285 node_to_amd_nb(i)->link = link =
286 next_northbridge(link, link_ids);
289 * If there are more PCI root devices than data fabric/
290 * system management network interfaces, then the (N)
291 * PCI roots per DF/SMN interface are functionally the
292 * same (for DF/SMN access) and N-1 are redundant. N-1
293 * PCI roots should be skipped per DF/SMN interface so
294 * the following DF/SMN interfaces get mapped to
297 for (j = 1; j < roots_per_misc; j++)
298 root = next_northbridge(root, root_ids);
301 if (amd_gart_present())
302 amd_northbridges.flags |= AMD_NB_GART;
305 * Check for L3 cache presence.
307 if (!cpuid_edx(0x80000006))
311 * Some CPU families support L3 Cache Index Disable. There are some
312 * limitations because of E382 and E388 on family 0x10.
314 if (boot_cpu_data.x86 == 0x10 &&
315 boot_cpu_data.x86_model >= 0x8 &&
316 (boot_cpu_data.x86_model > 0x9 ||
317 boot_cpu_data.x86_stepping >= 0x1))
318 amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE;
320 if (boot_cpu_data.x86 == 0x15)
321 amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE;
323 /* L3 cache partitioning is supported on family 0x15 */
324 if (boot_cpu_data.x86 == 0x15)
325 amd_northbridges.flags |= AMD_NB_L3_PARTITIONING;
329 EXPORT_SYMBOL_GPL(amd_cache_northbridges);
332 * Ignores subdevice/subvendor but as far as I can figure out
333 * they're useless anyways
335 bool __init early_is_amd_nb(u32 device)
337 const struct pci_device_id *misc_ids = amd_nb_misc_ids;
338 const struct pci_device_id *id;
339 u32 vendor = device & 0xffff;
341 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD &&
342 boot_cpu_data.x86_vendor != X86_VENDOR_HYGON)
345 if (boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)
346 misc_ids = hygon_nb_misc_ids;
349 for (id = misc_ids; id->vendor; id++)
350 if (vendor == id->vendor && device == id->device)
355 struct resource *amd_get_mmconfig_range(struct resource *res)
359 unsigned int segn_busn_bits;
361 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD &&
362 boot_cpu_data.x86_vendor != X86_VENDOR_HYGON)
365 /* assume all cpus from fam10h have mmconfig */
366 if (boot_cpu_data.x86 < 0x10)
369 address = MSR_FAM10H_MMIO_CONF_BASE;
370 rdmsrl(address, msr);
372 /* mmconfig is not enabled */
373 if (!(msr & FAM10H_MMIO_CONF_ENABLE))
376 base = msr & (FAM10H_MMIO_CONF_BASE_MASK<<FAM10H_MMIO_CONF_BASE_SHIFT);
378 segn_busn_bits = (msr >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) &
379 FAM10H_MMIO_CONF_BUSRANGE_MASK;
381 res->flags = IORESOURCE_MEM;
383 res->end = base + (1ULL<<(segn_busn_bits + 20)) - 1;
387 int amd_get_subcaches(int cpu)
389 struct pci_dev *link = node_to_amd_nb(amd_get_nb_id(cpu))->link;
392 if (!amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
395 pci_read_config_dword(link, 0x1d4, &mask);
397 return (mask >> (4 * cpu_data(cpu).cpu_core_id)) & 0xf;
400 int amd_set_subcaches(int cpu, unsigned long mask)
402 static unsigned int reset, ban;
403 struct amd_northbridge *nb = node_to_amd_nb(amd_get_nb_id(cpu));
407 if (!amd_nb_has_feature(AMD_NB_L3_PARTITIONING) || mask > 0xf)
410 /* if necessary, collect reset state of L3 partitioning and BAN mode */
412 pci_read_config_dword(nb->link, 0x1d4, &reset);
413 pci_read_config_dword(nb->misc, 0x1b8, &ban);
417 /* deactivate BAN mode if any subcaches are to be disabled */
419 pci_read_config_dword(nb->misc, 0x1b8, ®);
420 pci_write_config_dword(nb->misc, 0x1b8, reg & ~0x180000);
423 cuid = cpu_data(cpu).cpu_core_id;
425 mask |= (0xf ^ (1 << cuid)) << 26;
427 pci_write_config_dword(nb->link, 0x1d4, mask);
429 /* reset BAN mode if L3 partitioning returned to reset state */
430 pci_read_config_dword(nb->link, 0x1d4, ®);
432 pci_read_config_dword(nb->misc, 0x1b8, ®);
434 pci_write_config_dword(nb->misc, 0x1b8, reg | ban);
440 static void amd_cache_gart(void)
444 if (!amd_nb_has_feature(AMD_NB_GART))
447 flush_words = kmalloc_array(amd_northbridges.num, sizeof(u32), GFP_KERNEL);
449 amd_northbridges.flags &= ~AMD_NB_GART;
450 pr_notice("Cannot initialize GART flush words, GART support disabled\n");
454 for (i = 0; i != amd_northbridges.num; i++)
455 pci_read_config_dword(node_to_amd_nb(i)->misc, 0x9c, &flush_words[i]);
458 void amd_flush_garts(void)
462 static DEFINE_SPINLOCK(gart_lock);
464 if (!amd_nb_has_feature(AMD_NB_GART))
468 * Avoid races between AGP and IOMMU. In theory it's not needed
469 * but I'm not sure if the hardware won't lose flush requests
470 * when another is pending. This whole thing is so expensive anyways
471 * that it doesn't matter to serialize more. -AK
473 spin_lock_irqsave(&gart_lock, flags);
475 for (i = 0; i < amd_northbridges.num; i++) {
476 pci_write_config_dword(node_to_amd_nb(i)->misc, 0x9c,
480 for (i = 0; i < amd_northbridges.num; i++) {
482 /* Make sure the hardware actually executed the flush*/
484 pci_read_config_dword(node_to_amd_nb(i)->misc,
491 spin_unlock_irqrestore(&gart_lock, flags);
493 pr_notice("nothing to flush?\n");
495 EXPORT_SYMBOL_GPL(amd_flush_garts);
497 static void __fix_erratum_688(void *info)
499 #define MSR_AMD64_IC_CFG 0xC0011021
501 msr_set_bit(MSR_AMD64_IC_CFG, 3);
502 msr_set_bit(MSR_AMD64_IC_CFG, 14);
505 /* Apply erratum 688 fix so machines without a BIOS fix work. */
506 static __init void fix_erratum_688(void)
511 if (boot_cpu_data.x86 != 0x14)
514 if (!amd_northbridges.num)
517 F4 = node_to_amd_nb(0)->link;
521 if (pci_read_config_dword(F4, 0x164, &val))
527 on_each_cpu(__fix_erratum_688, NULL, 0);
529 pr_info("x86/cpu/AMD: CPU erratum 688 worked around\n");
532 static __init int init_amd_nbs(void)
534 amd_cache_northbridges();
542 /* This has to go after the PCI subsystem */
543 fs_initcall(init_amd_nbs);