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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * AMD SoC Power Management Controller Driver
4 *
5 * Copyright (c) 2020, Advanced Micro Devices, Inc.
6 * All Rights Reserved.
7 *
8 * Author: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
9 */
10
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13#include <linux/acpi.h>
14#include <linux/bitfield.h>
15#include <linux/bits.h>
16#include <linux/debugfs.h>
17#include <linux/delay.h>
18#include <linux/io.h>
19#include <linux/iopoll.h>
20#include <linux/module.h>
21#include <linux/pci.h>
22#include <linux/platform_device.h>
23#include <linux/suspend.h>
24#include <linux/seq_file.h>
25#include <linux/uaccess.h>
26
27/* SMU communication registers */
28#define AMD_PMC_REGISTER_MESSAGE 0x538
29#define AMD_PMC_REGISTER_RESPONSE 0x980
30#define AMD_PMC_REGISTER_ARGUMENT 0x9BC
31
32/* Base address of SMU for mapping physical address to virtual address */
33#define AMD_PMC_SMU_INDEX_ADDRESS 0xB8
34#define AMD_PMC_SMU_INDEX_DATA 0xBC
35#define AMD_PMC_MAPPING_SIZE 0x01000
36#define AMD_PMC_BASE_ADDR_OFFSET 0x10000
37#define AMD_PMC_BASE_ADDR_LO 0x13B102E8
38#define AMD_PMC_BASE_ADDR_HI 0x13B102EC
39#define AMD_PMC_BASE_ADDR_LO_MASK GENMASK(15, 0)
40#define AMD_PMC_BASE_ADDR_HI_MASK GENMASK(31, 20)
41
42/* SMU Response Codes */
43#define AMD_PMC_RESULT_OK 0x01
44#define AMD_PMC_RESULT_CMD_REJECT_BUSY 0xFC
45#define AMD_PMC_RESULT_CMD_REJECT_PREREQ 0xFD
46#define AMD_PMC_RESULT_CMD_UNKNOWN 0xFE
47#define AMD_PMC_RESULT_FAILED 0xFF
48
49/* FCH SSC Registers */
50#define FCH_S0I3_ENTRY_TIME_L_OFFSET 0x30
51#define FCH_S0I3_ENTRY_TIME_H_OFFSET 0x34
52#define FCH_S0I3_EXIT_TIME_L_OFFSET 0x38
53#define FCH_S0I3_EXIT_TIME_H_OFFSET 0x3C
54#define FCH_SSC_MAPPING_SIZE 0x800
55#define FCH_BASE_PHY_ADDR_LOW 0xFED81100
56#define FCH_BASE_PHY_ADDR_HIGH 0x00000000
57
58/* SMU Message Definations */
59#define SMU_MSG_GETSMUVERSION 0x02
60#define SMU_MSG_LOG_GETDRAM_ADDR_HI 0x04
61#define SMU_MSG_LOG_GETDRAM_ADDR_LO 0x05
62#define SMU_MSG_LOG_START 0x06
63#define SMU_MSG_LOG_RESET 0x07
64#define SMU_MSG_LOG_DUMP_DATA 0x08
65#define SMU_MSG_GET_SUP_CONSTRAINTS 0x09
66/* List of supported CPU ids */
67#define AMD_CPU_ID_RV 0x15D0
68#define AMD_CPU_ID_RN 0x1630
69#define AMD_CPU_ID_PCO AMD_CPU_ID_RV
70#define AMD_CPU_ID_CZN AMD_CPU_ID_RN
71#define AMD_CPU_ID_YC 0x14B5
72
73#define PMC_MSG_DELAY_MIN_US 100
74#define RESPONSE_REGISTER_LOOP_MAX 20000
75
76#define SOC_SUBSYSTEM_IP_MAX 12
77#define DELAY_MIN_US 2000
78#define DELAY_MAX_US 3000
79enum amd_pmc_def {
80 MSG_TEST = 0x01,
81 MSG_OS_HINT_PCO,
82 MSG_OS_HINT_RN,
83};
84
85struct amd_pmc_bit_map {
86 const char *name;
87 u32 bit_mask;
88};
89
90static const struct amd_pmc_bit_map soc15_ip_blk[] = {
91 {"DISPLAY", BIT(0)},
92 {"CPU", BIT(1)},
93 {"GFX", BIT(2)},
94 {"VDD", BIT(3)},
95 {"ACP", BIT(4)},
96 {"VCN", BIT(5)},
97 {"ISP", BIT(6)},
98 {"NBIO", BIT(7)},
99 {"DF", BIT(8)},
100 {"USB0", BIT(9)},
101 {"USB1", BIT(10)},
102 {"LAPIC", BIT(11)},
103 {}
104};
105
106struct amd_pmc_dev {
107 void __iomem *regbase;
108 void __iomem *smu_virt_addr;
109 void __iomem *fch_virt_addr;
110 u32 base_addr;
111 u32 cpu_id;
112 u32 active_ips;
113 struct device *dev;
114 struct mutex lock; /* generic mutex lock */
115#if IS_ENABLED(CONFIG_DEBUG_FS)
116 struct dentry *dbgfs_dir;
117#endif /* CONFIG_DEBUG_FS */
118};
119
120static struct amd_pmc_dev pmc;
121static int amd_pmc_send_cmd(struct amd_pmc_dev *dev, bool set, u32 *data, u8 msg, bool ret);
122
123static inline u32 amd_pmc_reg_read(struct amd_pmc_dev *dev, int reg_offset)
124{
125 return ioread32(dev->regbase + reg_offset);
126}
127
128static inline void amd_pmc_reg_write(struct amd_pmc_dev *dev, int reg_offset, u32 val)
129{
130 iowrite32(val, dev->regbase + reg_offset);
131}
132
133struct smu_metrics {
134 u32 table_version;
135 u32 hint_count;
136 u32 s0i3_cyclecount;
137 u32 timein_s0i2;
138 u64 timeentering_s0i3_lastcapture;
139 u64 timeentering_s0i3_totaltime;
140 u64 timeto_resume_to_os_lastcapture;
141 u64 timeto_resume_to_os_totaltime;
142 u64 timein_s0i3_lastcapture;
143 u64 timein_s0i3_totaltime;
144 u64 timein_swdrips_lastcapture;
145 u64 timein_swdrips_totaltime;
146 u64 timecondition_notmet_lastcapture[SOC_SUBSYSTEM_IP_MAX];
147 u64 timecondition_notmet_totaltime[SOC_SUBSYSTEM_IP_MAX];
148} __packed;
149
150#ifdef CONFIG_DEBUG_FS
151static int smu_fw_info_show(struct seq_file *s, void *unused)
152{
153 struct amd_pmc_dev *dev = s->private;
154 struct smu_metrics table;
155 int idx;
156
157 if (dev->cpu_id == AMD_CPU_ID_PCO)
158 return -EINVAL;
159
160 memcpy_fromio(&table, dev->smu_virt_addr, sizeof(struct smu_metrics));
161
162 seq_puts(s, "\n=== SMU Statistics ===\n");
163 seq_printf(s, "Table Version: %d\n", table.table_version);
164 seq_printf(s, "Hint Count: %d\n", table.hint_count);
165 seq_printf(s, "S0i3 Cycle Count: %d\n", table.s0i3_cyclecount);
166 seq_printf(s, "Time (in us) to S0i3: %lld\n", table.timeentering_s0i3_lastcapture);
167 seq_printf(s, "Time (in us) in S0i3: %lld\n", table.timein_s0i3_lastcapture);
168
169 seq_puts(s, "\n=== Active time (in us) ===\n");
170 for (idx = 0 ; idx < SOC_SUBSYSTEM_IP_MAX ; idx++) {
171 if (soc15_ip_blk[idx].bit_mask & dev->active_ips)
172 seq_printf(s, "%-8s : %lld\n", soc15_ip_blk[idx].name,
173 table.timecondition_notmet_lastcapture[idx]);
174 }
175
176 return 0;
177}
178DEFINE_SHOW_ATTRIBUTE(smu_fw_info);
179
180static int s0ix_stats_show(struct seq_file *s, void *unused)
181{
182 struct amd_pmc_dev *dev = s->private;
183 u64 entry_time, exit_time, residency;
184
185 entry_time = ioread32(dev->fch_virt_addr + FCH_S0I3_ENTRY_TIME_H_OFFSET);
186 entry_time = entry_time << 32 | ioread32(dev->fch_virt_addr + FCH_S0I3_ENTRY_TIME_L_OFFSET);
187
188 exit_time = ioread32(dev->fch_virt_addr + FCH_S0I3_EXIT_TIME_H_OFFSET);
189 exit_time = exit_time << 32 | ioread32(dev->fch_virt_addr + FCH_S0I3_EXIT_TIME_L_OFFSET);
190
191 /* It's in 48MHz. We need to convert it */
192 residency = exit_time - entry_time;
193 do_div(residency, 48);
194
195 seq_puts(s, "=== S0ix statistics ===\n");
196 seq_printf(s, "S0ix Entry Time: %lld\n", entry_time);
197 seq_printf(s, "S0ix Exit Time: %lld\n", exit_time);
198 seq_printf(s, "Residency Time: %lld\n", residency);
199
200 return 0;
201}
202DEFINE_SHOW_ATTRIBUTE(s0ix_stats);
203
204static void amd_pmc_dbgfs_unregister(struct amd_pmc_dev *dev)
205{
206 debugfs_remove_recursive(dev->dbgfs_dir);
207}
208
209static void amd_pmc_dbgfs_register(struct amd_pmc_dev *dev)
210{
211 dev->dbgfs_dir = debugfs_create_dir("amd_pmc", NULL);
212 debugfs_create_file("smu_fw_info", 0644, dev->dbgfs_dir, dev,
213 &smu_fw_info_fops);
214 debugfs_create_file("s0ix_stats", 0644, dev->dbgfs_dir, dev,
215 &s0ix_stats_fops);
216}
217#else
218static inline void amd_pmc_dbgfs_register(struct amd_pmc_dev *dev)
219{
220}
221
222static inline void amd_pmc_dbgfs_unregister(struct amd_pmc_dev *dev)
223{
224}
225#endif /* CONFIG_DEBUG_FS */
226
227static int amd_pmc_setup_smu_logging(struct amd_pmc_dev *dev)
228{
229 u32 phys_addr_low, phys_addr_hi;
230 u64 smu_phys_addr;
231
232 if (dev->cpu_id == AMD_CPU_ID_PCO)
233 return -EINVAL;
234
235 /* Get Active devices list from SMU */
236 amd_pmc_send_cmd(dev, 0, &dev->active_ips, SMU_MSG_GET_SUP_CONSTRAINTS, 1);
237
238 /* Get dram address */
239 amd_pmc_send_cmd(dev, 0, &phys_addr_low, SMU_MSG_LOG_GETDRAM_ADDR_LO, 1);
240 amd_pmc_send_cmd(dev, 0, &phys_addr_hi, SMU_MSG_LOG_GETDRAM_ADDR_HI, 1);
241 smu_phys_addr = ((u64)phys_addr_hi << 32 | phys_addr_low);
242
243 dev->smu_virt_addr = devm_ioremap(dev->dev, smu_phys_addr, sizeof(struct smu_metrics));
244 if (!dev->smu_virt_addr)
245 return -ENOMEM;
246
247 /* Start the logging */
248 amd_pmc_send_cmd(dev, 0, NULL, SMU_MSG_LOG_START, 0);
249
250 return 0;
251}
252
253static void amd_pmc_dump_registers(struct amd_pmc_dev *dev)
254{
255 u32 value;
256
257 value = amd_pmc_reg_read(dev, AMD_PMC_REGISTER_RESPONSE);
258 dev_dbg(dev->dev, "AMD_PMC_REGISTER_RESPONSE:%x\n", value);
259
260 value = amd_pmc_reg_read(dev, AMD_PMC_REGISTER_ARGUMENT);
261 dev_dbg(dev->dev, "AMD_PMC_REGISTER_ARGUMENT:%x\n", value);
262
263 value = amd_pmc_reg_read(dev, AMD_PMC_REGISTER_MESSAGE);
264 dev_dbg(dev->dev, "AMD_PMC_REGISTER_MESSAGE:%x\n", value);
265}
266
267static int amd_pmc_send_cmd(struct amd_pmc_dev *dev, bool set, u32 *data, u8 msg, bool ret)
268{
269 int rc;
270 u32 val;
271
272 mutex_lock(&dev->lock);
273 /* Wait until we get a valid response */
274 rc = readx_poll_timeout(ioread32, dev->regbase + AMD_PMC_REGISTER_RESPONSE,
275 val, val != 0, PMC_MSG_DELAY_MIN_US,
276 PMC_MSG_DELAY_MIN_US * RESPONSE_REGISTER_LOOP_MAX);
277 if (rc) {
278 dev_err(dev->dev, "failed to talk to SMU\n");
279 goto out_unlock;
280 }
281
282 /* Write zero to response register */
283 amd_pmc_reg_write(dev, AMD_PMC_REGISTER_RESPONSE, 0);
284
285 /* Write argument into response register */
286 amd_pmc_reg_write(dev, AMD_PMC_REGISTER_ARGUMENT, set);
287
288 /* Write message ID to message ID register */
289 amd_pmc_reg_write(dev, AMD_PMC_REGISTER_MESSAGE, msg);
290
291 /* Wait until we get a valid response */
292 rc = readx_poll_timeout(ioread32, dev->regbase + AMD_PMC_REGISTER_RESPONSE,
293 val, val != 0, PMC_MSG_DELAY_MIN_US,
294 PMC_MSG_DELAY_MIN_US * RESPONSE_REGISTER_LOOP_MAX);
295 if (rc) {
296 dev_err(dev->dev, "SMU response timed out\n");
297 goto out_unlock;
298 }
299
300 switch (val) {
301 case AMD_PMC_RESULT_OK:
302 if (ret) {
303 /* PMFW may take longer time to return back the data */
304 usleep_range(DELAY_MIN_US, 10 * DELAY_MAX_US);
305 *data = amd_pmc_reg_read(dev, AMD_PMC_REGISTER_ARGUMENT);
306 }
307 break;
308 case AMD_PMC_RESULT_CMD_REJECT_BUSY:
309 dev_err(dev->dev, "SMU not ready. err: 0x%x\n", val);
310 rc = -EBUSY;
311 goto out_unlock;
312 case AMD_PMC_RESULT_CMD_UNKNOWN:
313 dev_err(dev->dev, "SMU cmd unknown. err: 0x%x\n", val);
314 rc = -EINVAL;
315 goto out_unlock;
316 case AMD_PMC_RESULT_CMD_REJECT_PREREQ:
317 case AMD_PMC_RESULT_FAILED:
318 default:
319 dev_err(dev->dev, "SMU cmd failed. err: 0x%x\n", val);
320 rc = -EIO;
321 goto out_unlock;
322 }
323
324out_unlock:
325 mutex_unlock(&dev->lock);
326 amd_pmc_dump_registers(dev);
327 return rc;
328}
329
330static int amd_pmc_get_os_hint(struct amd_pmc_dev *dev)
331{
332 switch (dev->cpu_id) {
333 case AMD_CPU_ID_PCO:
334 return MSG_OS_HINT_PCO;
335 case AMD_CPU_ID_RN:
336 case AMD_CPU_ID_YC:
337 return MSG_OS_HINT_RN;
338 }
339 return -EINVAL;
340}
341
342static int __maybe_unused amd_pmc_suspend(struct device *dev)
343{
344 struct amd_pmc_dev *pdev = dev_get_drvdata(dev);
345 int rc;
346 u8 msg;
347
348 /* Reset and Start SMU logging - to monitor the s0i3 stats */
349 amd_pmc_send_cmd(pdev, 0, NULL, SMU_MSG_LOG_RESET, 0);
350 amd_pmc_send_cmd(pdev, 0, NULL, SMU_MSG_LOG_START, 0);
351
352 msg = amd_pmc_get_os_hint(pdev);
353 rc = amd_pmc_send_cmd(pdev, 1, NULL, msg, 0);
354 if (rc)
355 dev_err(pdev->dev, "suspend failed\n");
356
357 return rc;
358}
359
360static int __maybe_unused amd_pmc_resume(struct device *dev)
361{
362 struct amd_pmc_dev *pdev = dev_get_drvdata(dev);
363 int rc;
364 u8 msg;
365
366 /* Let SMU know that we are looking for stats */
367 amd_pmc_send_cmd(pdev, 0, NULL, SMU_MSG_LOG_DUMP_DATA, 0);
368
369 msg = amd_pmc_get_os_hint(pdev);
370 rc = amd_pmc_send_cmd(pdev, 0, NULL, msg, 0);
371 if (rc)
372 dev_err(pdev->dev, "resume failed\n");
373
374 return 0;
375}
376
377static const struct dev_pm_ops amd_pmc_pm_ops = {
378 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(amd_pmc_suspend, amd_pmc_resume)
379};
380
381static const struct pci_device_id pmc_pci_ids[] = {
382 { PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_YC) },
383 { PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_CZN) },
384 { PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_RN) },
385 { PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_PCO) },
386 { PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_RV) },
387 { }
388};
389
390static int amd_pmc_probe(struct platform_device *pdev)
391{
392 struct amd_pmc_dev *dev = &pmc;
393 struct pci_dev *rdev;
394 u32 base_addr_lo, base_addr_hi;
395 u64 base_addr, fch_phys_addr;
396 int err;
397 u32 val;
398
399 dev->dev = &pdev->dev;
400
401 rdev = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(0, 0));
402 if (!rdev || !pci_match_id(pmc_pci_ids, rdev)) {
403 pci_dev_put(rdev);
404 return -ENODEV;
405 }
406
407 dev->cpu_id = rdev->device;
408 err = pci_write_config_dword(rdev, AMD_PMC_SMU_INDEX_ADDRESS, AMD_PMC_BASE_ADDR_LO);
409 if (err) {
410 dev_err(dev->dev, "error writing to 0x%x\n", AMD_PMC_SMU_INDEX_ADDRESS);
411 pci_dev_put(rdev);
412 return pcibios_err_to_errno(err);
413 }
414
415 err = pci_read_config_dword(rdev, AMD_PMC_SMU_INDEX_DATA, &val);
416 if (err) {
417 pci_dev_put(rdev);
418 return pcibios_err_to_errno(err);
419 }
420
421 base_addr_lo = val & AMD_PMC_BASE_ADDR_HI_MASK;
422
423 err = pci_write_config_dword(rdev, AMD_PMC_SMU_INDEX_ADDRESS, AMD_PMC_BASE_ADDR_HI);
424 if (err) {
425 dev_err(dev->dev, "error writing to 0x%x\n", AMD_PMC_SMU_INDEX_ADDRESS);
426 pci_dev_put(rdev);
427 return pcibios_err_to_errno(err);
428 }
429
430 err = pci_read_config_dword(rdev, AMD_PMC_SMU_INDEX_DATA, &val);
431 if (err) {
432 pci_dev_put(rdev);
433 return pcibios_err_to_errno(err);
434 }
435
436 base_addr_hi = val & AMD_PMC_BASE_ADDR_LO_MASK;
437 pci_dev_put(rdev);
438 base_addr = ((u64)base_addr_hi << 32 | base_addr_lo);
439
440 dev->regbase = devm_ioremap(dev->dev, base_addr + AMD_PMC_BASE_ADDR_OFFSET,
441 AMD_PMC_MAPPING_SIZE);
442 if (!dev->regbase)
443 return -ENOMEM;
444
445 mutex_init(&dev->lock);
446
447 /* Use FCH registers to get the S0ix stats */
448 base_addr_lo = FCH_BASE_PHY_ADDR_LOW;
449 base_addr_hi = FCH_BASE_PHY_ADDR_HIGH;
450 fch_phys_addr = ((u64)base_addr_hi << 32 | base_addr_lo);
451 dev->fch_virt_addr = devm_ioremap(dev->dev, fch_phys_addr, FCH_SSC_MAPPING_SIZE);
452 if (!dev->fch_virt_addr)
453 return -ENOMEM;
454
455 /* Use SMU to get the s0i3 debug stats */
456 err = amd_pmc_setup_smu_logging(dev);
457 if (err)
458 dev_err(dev->dev, "SMU debugging info not supported on this platform\n");
459
460 platform_set_drvdata(pdev, dev);
461 amd_pmc_dbgfs_register(dev);
462 return 0;
463}
464
465static int amd_pmc_remove(struct platform_device *pdev)
466{
467 struct amd_pmc_dev *dev = platform_get_drvdata(pdev);
468
469 amd_pmc_dbgfs_unregister(dev);
470 mutex_destroy(&dev->lock);
471 return 0;
472}
473
474static const struct acpi_device_id amd_pmc_acpi_ids[] = {
475 {"AMDI0005", 0},
476 {"AMDI0006", 0},
477 {"AMDI0007", 0},
478 {"AMD0004", 0},
479 {"AMD0005", 0},
480 { }
481};
482MODULE_DEVICE_TABLE(acpi, amd_pmc_acpi_ids);
483
484static struct platform_driver amd_pmc_driver = {
485 .driver = {
486 .name = "amd_pmc",
487 .acpi_match_table = amd_pmc_acpi_ids,
488 .pm = &amd_pmc_pm_ops,
489 },
490 .probe = amd_pmc_probe,
491 .remove = amd_pmc_remove,
492};
493module_platform_driver(amd_pmc_driver);
494
495MODULE_LICENSE("GPL v2");
496MODULE_DESCRIPTION("AMD PMC Driver");