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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 <asm/amd_nb.h>
14#include <linux/acpi.h>
15#include <linux/bitfield.h>
16#include <linux/bits.h>
17#include <linux/debugfs.h>
18#include <linux/delay.h>
19#include <linux/io.h>
20#include <linux/iopoll.h>
21#include <linux/limits.h>
22#include <linux/module.h>
23#include <linux/pci.h>
24#include <linux/platform_device.h>
25#include <linux/rtc.h>
26#include <linux/serio.h>
27#include <linux/suspend.h>
28#include <linux/seq_file.h>
29#include <linux/uaccess.h>
30
31#include "pmc.h"
32
33/* SMU communication registers */
34#define AMD_PMC_REGISTER_RESPONSE 0x980
35#define AMD_PMC_REGISTER_ARGUMENT 0x9BC
36
37/* PMC Scratch Registers */
38#define AMD_PMC_SCRATCH_REG_CZN 0x94
39#define AMD_PMC_SCRATCH_REG_YC 0xD14
40#define AMD_PMC_SCRATCH_REG_1AH 0xF14
41
42/* STB Registers */
43#define AMD_PMC_STB_PMI_0 0x03E30600
44#define AMD_PMC_STB_S2IDLE_PREPARE 0xC6000001
45#define AMD_PMC_STB_S2IDLE_RESTORE 0xC6000002
46#define AMD_PMC_STB_S2IDLE_CHECK 0xC6000003
47#define AMD_PMC_STB_DUMMY_PC 0xC6000007
48
49/* STB S2D(Spill to DRAM) has different message port offset */
50#define AMD_S2D_REGISTER_MESSAGE 0xA20
51#define AMD_S2D_REGISTER_RESPONSE 0xA80
52#define AMD_S2D_REGISTER_ARGUMENT 0xA88
53
54/* STB Spill to DRAM Parameters */
55#define S2D_TELEMETRY_BYTES_MAX 0x100000U
56#define S2D_RSVD_RAM_SPACE 0x100000
57#define S2D_TELEMETRY_DRAMBYTES_MAX 0x1000000
58
59/* STB Spill to DRAM Message Definition */
60#define STB_FORCE_FLUSH_DATA 0xCF
61
62/* Base address of SMU for mapping physical address to virtual address */
63#define AMD_PMC_MAPPING_SIZE 0x01000
64#define AMD_PMC_BASE_ADDR_OFFSET 0x10000
65#define AMD_PMC_BASE_ADDR_LO 0x13B102E8
66#define AMD_PMC_BASE_ADDR_HI 0x13B102EC
67#define AMD_PMC_BASE_ADDR_LO_MASK GENMASK(15, 0)
68#define AMD_PMC_BASE_ADDR_HI_MASK GENMASK(31, 20)
69
70/* SMU Response Codes */
71#define AMD_PMC_RESULT_OK 0x01
72#define AMD_PMC_RESULT_CMD_REJECT_BUSY 0xFC
73#define AMD_PMC_RESULT_CMD_REJECT_PREREQ 0xFD
74#define AMD_PMC_RESULT_CMD_UNKNOWN 0xFE
75#define AMD_PMC_RESULT_FAILED 0xFF
76
77/* FCH SSC Registers */
78#define FCH_S0I3_ENTRY_TIME_L_OFFSET 0x30
79#define FCH_S0I3_ENTRY_TIME_H_OFFSET 0x34
80#define FCH_S0I3_EXIT_TIME_L_OFFSET 0x38
81#define FCH_S0I3_EXIT_TIME_H_OFFSET 0x3C
82#define FCH_SSC_MAPPING_SIZE 0x800
83#define FCH_BASE_PHY_ADDR_LOW 0xFED81100
84#define FCH_BASE_PHY_ADDR_HIGH 0x00000000
85
86/* SMU Message Definations */
87#define SMU_MSG_GETSMUVERSION 0x02
88#define SMU_MSG_LOG_GETDRAM_ADDR_HI 0x04
89#define SMU_MSG_LOG_GETDRAM_ADDR_LO 0x05
90#define SMU_MSG_LOG_START 0x06
91#define SMU_MSG_LOG_RESET 0x07
92#define SMU_MSG_LOG_DUMP_DATA 0x08
93#define SMU_MSG_GET_SUP_CONSTRAINTS 0x09
94
95#define PMC_MSG_DELAY_MIN_US 50
96#define RESPONSE_REGISTER_LOOP_MAX 20000
97
98#define DELAY_MIN_US 2000
99#define DELAY_MAX_US 3000
100#define FIFO_SIZE 4096
101
102enum amd_pmc_def {
103 MSG_TEST = 0x01,
104 MSG_OS_HINT_PCO,
105 MSG_OS_HINT_RN,
106};
107
108enum s2d_arg {
109 S2D_TELEMETRY_SIZE = 0x01,
110 S2D_PHYS_ADDR_LOW,
111 S2D_PHYS_ADDR_HIGH,
112 S2D_NUM_SAMPLES,
113 S2D_DRAM_SIZE,
114};
115
116struct amd_pmc_stb_v2_data {
117 size_t size;
118 u8 data[] __counted_by(size);
119};
120
121struct amd_pmc_bit_map {
122 const char *name;
123 u32 bit_mask;
124};
125
126static const struct amd_pmc_bit_map soc15_ip_blk[] = {
127 {"DISPLAY", BIT(0)},
128 {"CPU", BIT(1)},
129 {"GFX", BIT(2)},
130 {"VDD", BIT(3)},
131 {"ACP", BIT(4)},
132 {"VCN", BIT(5)},
133 {"ISP", BIT(6)},
134 {"NBIO", BIT(7)},
135 {"DF", BIT(8)},
136 {"USB3_0", BIT(9)},
137 {"USB3_1", BIT(10)},
138 {"LAPIC", BIT(11)},
139 {"USB3_2", BIT(12)},
140 {"USB3_3", BIT(13)},
141 {"USB3_4", BIT(14)},
142 {"USB4_0", BIT(15)},
143 {"USB4_1", BIT(16)},
144 {"MPM", BIT(17)},
145 {"JPEG", BIT(18)},
146 {"IPU", BIT(19)},
147 {"UMSCH", BIT(20)},
148 {"VPE", BIT(21)},
149 {}
150};
151
152static bool enable_stb;
153module_param(enable_stb, bool, 0644);
154MODULE_PARM_DESC(enable_stb, "Enable the STB debug mechanism");
155
156static bool disable_workarounds;
157module_param(disable_workarounds, bool, 0644);
158MODULE_PARM_DESC(disable_workarounds, "Disable workarounds for platform bugs");
159
160static bool dump_custom_stb;
161module_param(dump_custom_stb, bool, 0644);
162MODULE_PARM_DESC(dump_custom_stb, "Enable to dump full STB buffer");
163
164static struct amd_pmc_dev pmc;
165static int amd_pmc_send_cmd(struct amd_pmc_dev *dev, u32 arg, u32 *data, u8 msg, bool ret);
166static int amd_pmc_read_stb(struct amd_pmc_dev *dev, u32 *buf);
167static int amd_pmc_write_stb(struct amd_pmc_dev *dev, u32 data);
168
169static inline u32 amd_pmc_reg_read(struct amd_pmc_dev *dev, int reg_offset)
170{
171 return ioread32(dev->regbase + reg_offset);
172}
173
174static inline void amd_pmc_reg_write(struct amd_pmc_dev *dev, int reg_offset, u32 val)
175{
176 iowrite32(val, dev->regbase + reg_offset);
177}
178
179struct smu_metrics {
180 u32 table_version;
181 u32 hint_count;
182 u32 s0i3_last_entry_status;
183 u32 timein_s0i2;
184 u64 timeentering_s0i3_lastcapture;
185 u64 timeentering_s0i3_totaltime;
186 u64 timeto_resume_to_os_lastcapture;
187 u64 timeto_resume_to_os_totaltime;
188 u64 timein_s0i3_lastcapture;
189 u64 timein_s0i3_totaltime;
190 u64 timein_swdrips_lastcapture;
191 u64 timein_swdrips_totaltime;
192 u64 timecondition_notmet_lastcapture[32];
193 u64 timecondition_notmet_totaltime[32];
194} __packed;
195
196static int amd_pmc_stb_debugfs_open(struct inode *inode, struct file *filp)
197{
198 struct amd_pmc_dev *dev = filp->f_inode->i_private;
199 u32 size = FIFO_SIZE * sizeof(u32);
200 u32 *buf;
201 int rc;
202
203 buf = kzalloc(size, GFP_KERNEL);
204 if (!buf)
205 return -ENOMEM;
206
207 rc = amd_pmc_read_stb(dev, buf);
208 if (rc) {
209 kfree(buf);
210 return rc;
211 }
212
213 filp->private_data = buf;
214 return rc;
215}
216
217static ssize_t amd_pmc_stb_debugfs_read(struct file *filp, char __user *buf, size_t size,
218 loff_t *pos)
219{
220 if (!filp->private_data)
221 return -EINVAL;
222
223 return simple_read_from_buffer(buf, size, pos, filp->private_data,
224 FIFO_SIZE * sizeof(u32));
225}
226
227static int amd_pmc_stb_debugfs_release(struct inode *inode, struct file *filp)
228{
229 kfree(filp->private_data);
230 return 0;
231}
232
233static const struct file_operations amd_pmc_stb_debugfs_fops = {
234 .owner = THIS_MODULE,
235 .open = amd_pmc_stb_debugfs_open,
236 .read = amd_pmc_stb_debugfs_read,
237 .release = amd_pmc_stb_debugfs_release,
238};
239
240/* Enhanced STB Firmware Reporting Mechanism */
241static int amd_pmc_stb_handle_efr(struct file *filp)
242{
243 struct amd_pmc_dev *dev = filp->f_inode->i_private;
244 struct amd_pmc_stb_v2_data *stb_data_arr;
245 u32 fsize;
246
247 fsize = dev->dram_size - S2D_RSVD_RAM_SPACE;
248 stb_data_arr = kmalloc(struct_size(stb_data_arr, data, fsize), GFP_KERNEL);
249 if (!stb_data_arr)
250 return -ENOMEM;
251
252 stb_data_arr->size = fsize;
253 memcpy_fromio(stb_data_arr->data, dev->stb_virt_addr, fsize);
254 filp->private_data = stb_data_arr;
255
256 return 0;
257}
258
259static int amd_pmc_stb_debugfs_open_v2(struct inode *inode, struct file *filp)
260{
261 struct amd_pmc_dev *dev = filp->f_inode->i_private;
262 u32 fsize, num_samples, val, stb_rdptr_offset = 0;
263 struct amd_pmc_stb_v2_data *stb_data_arr;
264 int ret;
265
266 /* Write dummy postcode while reading the STB buffer */
267 ret = amd_pmc_write_stb(dev, AMD_PMC_STB_DUMMY_PC);
268 if (ret)
269 dev_err(dev->dev, "error writing to STB: %d\n", ret);
270
271 /* Spill to DRAM num_samples uses separate SMU message port */
272 dev->msg_port = 1;
273
274 ret = amd_pmc_send_cmd(dev, 0, &val, STB_FORCE_FLUSH_DATA, 1);
275 if (ret)
276 dev_dbg_once(dev->dev, "S2D force flush not supported: %d\n", ret);
277
278 /*
279 * We have a custom stb size and the PMFW is supposed to give
280 * the enhanced dram size. Note that we land here only for the
281 * platforms that support enhanced dram size reporting.
282 */
283 if (dump_custom_stb)
284 return amd_pmc_stb_handle_efr(filp);
285
286 /* Get the num_samples to calculate the last push location */
287 ret = amd_pmc_send_cmd(dev, S2D_NUM_SAMPLES, &num_samples, dev->s2d_msg_id, true);
288 /* Clear msg_port for other SMU operation */
289 dev->msg_port = 0;
290 if (ret) {
291 dev_err(dev->dev, "error: S2D_NUM_SAMPLES not supported : %d\n", ret);
292 return ret;
293 }
294
295 fsize = min(num_samples, S2D_TELEMETRY_BYTES_MAX);
296 stb_data_arr = kmalloc(struct_size(stb_data_arr, data, fsize), GFP_KERNEL);
297 if (!stb_data_arr)
298 return -ENOMEM;
299
300 stb_data_arr->size = fsize;
301
302 /*
303 * Start capturing data from the last push location.
304 * This is for general cases, where the stb limits
305 * are meant for standard usage.
306 */
307 if (num_samples > S2D_TELEMETRY_BYTES_MAX) {
308 /* First read oldest data starting 1 behind last write till end of ringbuffer */
309 stb_rdptr_offset = num_samples % S2D_TELEMETRY_BYTES_MAX;
310 fsize = S2D_TELEMETRY_BYTES_MAX - stb_rdptr_offset;
311
312 memcpy_fromio(stb_data_arr->data, dev->stb_virt_addr + stb_rdptr_offset, fsize);
313 /* Second copy the newer samples from offset 0 - last write */
314 memcpy_fromio(stb_data_arr->data + fsize, dev->stb_virt_addr, stb_rdptr_offset);
315 } else {
316 memcpy_fromio(stb_data_arr->data, dev->stb_virt_addr, fsize);
317 }
318
319 filp->private_data = stb_data_arr;
320
321 return 0;
322}
323
324static ssize_t amd_pmc_stb_debugfs_read_v2(struct file *filp, char __user *buf, size_t size,
325 loff_t *pos)
326{
327 struct amd_pmc_stb_v2_data *data = filp->private_data;
328
329 return simple_read_from_buffer(buf, size, pos, data->data, data->size);
330}
331
332static int amd_pmc_stb_debugfs_release_v2(struct inode *inode, struct file *filp)
333{
334 kfree(filp->private_data);
335 return 0;
336}
337
338static const struct file_operations amd_pmc_stb_debugfs_fops_v2 = {
339 .owner = THIS_MODULE,
340 .open = amd_pmc_stb_debugfs_open_v2,
341 .read = amd_pmc_stb_debugfs_read_v2,
342 .release = amd_pmc_stb_debugfs_release_v2,
343};
344
345static void amd_pmc_get_ip_info(struct amd_pmc_dev *dev)
346{
347 switch (dev->cpu_id) {
348 case AMD_CPU_ID_PCO:
349 case AMD_CPU_ID_RN:
350 case AMD_CPU_ID_YC:
351 case AMD_CPU_ID_CB:
352 dev->num_ips = 12;
353 dev->s2d_msg_id = 0xBE;
354 dev->smu_msg = 0x538;
355 break;
356 case AMD_CPU_ID_PS:
357 dev->num_ips = 21;
358 dev->s2d_msg_id = 0x85;
359 dev->smu_msg = 0x538;
360 break;
361 case PCI_DEVICE_ID_AMD_1AH_M20H_ROOT:
362 case PCI_DEVICE_ID_AMD_1AH_M60H_ROOT:
363 dev->num_ips = 22;
364 dev->s2d_msg_id = 0xDE;
365 dev->smu_msg = 0x938;
366 break;
367 }
368}
369
370static int amd_pmc_setup_smu_logging(struct amd_pmc_dev *dev)
371{
372 if (dev->cpu_id == AMD_CPU_ID_PCO) {
373 dev_warn_once(dev->dev, "SMU debugging info not supported on this platform\n");
374 return -EINVAL;
375 }
376
377 /* Get Active devices list from SMU */
378 if (!dev->active_ips)
379 amd_pmc_send_cmd(dev, 0, &dev->active_ips, SMU_MSG_GET_SUP_CONSTRAINTS, true);
380
381 /* Get dram address */
382 if (!dev->smu_virt_addr) {
383 u32 phys_addr_low, phys_addr_hi;
384 u64 smu_phys_addr;
385
386 amd_pmc_send_cmd(dev, 0, &phys_addr_low, SMU_MSG_LOG_GETDRAM_ADDR_LO, true);
387 amd_pmc_send_cmd(dev, 0, &phys_addr_hi, SMU_MSG_LOG_GETDRAM_ADDR_HI, true);
388 smu_phys_addr = ((u64)phys_addr_hi << 32 | phys_addr_low);
389
390 dev->smu_virt_addr = devm_ioremap(dev->dev, smu_phys_addr,
391 sizeof(struct smu_metrics));
392 if (!dev->smu_virt_addr)
393 return -ENOMEM;
394 }
395
396 /* Start the logging */
397 amd_pmc_send_cmd(dev, 0, NULL, SMU_MSG_LOG_RESET, false);
398 amd_pmc_send_cmd(dev, 0, NULL, SMU_MSG_LOG_START, false);
399
400 return 0;
401}
402
403static int get_metrics_table(struct amd_pmc_dev *pdev, struct smu_metrics *table)
404{
405 if (!pdev->smu_virt_addr) {
406 int ret = amd_pmc_setup_smu_logging(pdev);
407
408 if (ret)
409 return ret;
410 }
411
412 if (pdev->cpu_id == AMD_CPU_ID_PCO)
413 return -ENODEV;
414 memcpy_fromio(table, pdev->smu_virt_addr, sizeof(struct smu_metrics));
415 return 0;
416}
417
418static void amd_pmc_validate_deepest(struct amd_pmc_dev *pdev)
419{
420 struct smu_metrics table;
421
422 if (get_metrics_table(pdev, &table))
423 return;
424
425 if (!table.s0i3_last_entry_status)
426 dev_warn(pdev->dev, "Last suspend didn't reach deepest state\n");
427 pm_report_hw_sleep_time(table.s0i3_last_entry_status ?
428 table.timein_s0i3_lastcapture : 0);
429}
430
431static int amd_pmc_get_smu_version(struct amd_pmc_dev *dev)
432{
433 int rc;
434 u32 val;
435
436 if (dev->cpu_id == AMD_CPU_ID_PCO)
437 return -ENODEV;
438
439 rc = amd_pmc_send_cmd(dev, 0, &val, SMU_MSG_GETSMUVERSION, true);
440 if (rc)
441 return rc;
442
443 dev->smu_program = (val >> 24) & GENMASK(7, 0);
444 dev->major = (val >> 16) & GENMASK(7, 0);
445 dev->minor = (val >> 8) & GENMASK(7, 0);
446 dev->rev = (val >> 0) & GENMASK(7, 0);
447
448 dev_dbg(dev->dev, "SMU program %u version is %u.%u.%u\n",
449 dev->smu_program, dev->major, dev->minor, dev->rev);
450
451 return 0;
452}
453
454static ssize_t smu_fw_version_show(struct device *d, struct device_attribute *attr,
455 char *buf)
456{
457 struct amd_pmc_dev *dev = dev_get_drvdata(d);
458
459 if (!dev->major) {
460 int rc = amd_pmc_get_smu_version(dev);
461
462 if (rc)
463 return rc;
464 }
465 return sysfs_emit(buf, "%u.%u.%u\n", dev->major, dev->minor, dev->rev);
466}
467
468static ssize_t smu_program_show(struct device *d, struct device_attribute *attr,
469 char *buf)
470{
471 struct amd_pmc_dev *dev = dev_get_drvdata(d);
472
473 if (!dev->major) {
474 int rc = amd_pmc_get_smu_version(dev);
475
476 if (rc)
477 return rc;
478 }
479 return sysfs_emit(buf, "%u\n", dev->smu_program);
480}
481
482static DEVICE_ATTR_RO(smu_fw_version);
483static DEVICE_ATTR_RO(smu_program);
484
485static umode_t pmc_attr_is_visible(struct kobject *kobj, struct attribute *attr, int idx)
486{
487 struct device *dev = kobj_to_dev(kobj);
488 struct amd_pmc_dev *pdev = dev_get_drvdata(dev);
489
490 if (pdev->cpu_id == AMD_CPU_ID_PCO)
491 return 0;
492 return 0444;
493}
494
495static struct attribute *pmc_attrs[] = {
496 &dev_attr_smu_fw_version.attr,
497 &dev_attr_smu_program.attr,
498 NULL,
499};
500
501static struct attribute_group pmc_attr_group = {
502 .attrs = pmc_attrs,
503 .is_visible = pmc_attr_is_visible,
504};
505
506static const struct attribute_group *pmc_groups[] = {
507 &pmc_attr_group,
508 NULL,
509};
510
511static int smu_fw_info_show(struct seq_file *s, void *unused)
512{
513 struct amd_pmc_dev *dev = s->private;
514 struct smu_metrics table;
515 int idx;
516
517 if (get_metrics_table(dev, &table))
518 return -EINVAL;
519
520 seq_puts(s, "\n=== SMU Statistics ===\n");
521 seq_printf(s, "Table Version: %d\n", table.table_version);
522 seq_printf(s, "Hint Count: %d\n", table.hint_count);
523 seq_printf(s, "Last S0i3 Status: %s\n", table.s0i3_last_entry_status ? "Success" :
524 "Unknown/Fail");
525 seq_printf(s, "Time (in us) to S0i3: %lld\n", table.timeentering_s0i3_lastcapture);
526 seq_printf(s, "Time (in us) in S0i3: %lld\n", table.timein_s0i3_lastcapture);
527 seq_printf(s, "Time (in us) to resume from S0i3: %lld\n",
528 table.timeto_resume_to_os_lastcapture);
529
530 seq_puts(s, "\n=== Active time (in us) ===\n");
531 for (idx = 0 ; idx < dev->num_ips ; idx++) {
532 if (soc15_ip_blk[idx].bit_mask & dev->active_ips)
533 seq_printf(s, "%-8s : %lld\n", soc15_ip_blk[idx].name,
534 table.timecondition_notmet_lastcapture[idx]);
535 }
536
537 return 0;
538}
539DEFINE_SHOW_ATTRIBUTE(smu_fw_info);
540
541static int s0ix_stats_show(struct seq_file *s, void *unused)
542{
543 struct amd_pmc_dev *dev = s->private;
544 u64 entry_time, exit_time, residency;
545
546 /* Use FCH registers to get the S0ix stats */
547 if (!dev->fch_virt_addr) {
548 u32 base_addr_lo = FCH_BASE_PHY_ADDR_LOW;
549 u32 base_addr_hi = FCH_BASE_PHY_ADDR_HIGH;
550 u64 fch_phys_addr = ((u64)base_addr_hi << 32 | base_addr_lo);
551
552 dev->fch_virt_addr = devm_ioremap(dev->dev, fch_phys_addr, FCH_SSC_MAPPING_SIZE);
553 if (!dev->fch_virt_addr)
554 return -ENOMEM;
555 }
556
557 entry_time = ioread32(dev->fch_virt_addr + FCH_S0I3_ENTRY_TIME_H_OFFSET);
558 entry_time = entry_time << 32 | ioread32(dev->fch_virt_addr + FCH_S0I3_ENTRY_TIME_L_OFFSET);
559
560 exit_time = ioread32(dev->fch_virt_addr + FCH_S0I3_EXIT_TIME_H_OFFSET);
561 exit_time = exit_time << 32 | ioread32(dev->fch_virt_addr + FCH_S0I3_EXIT_TIME_L_OFFSET);
562
563 /* It's in 48MHz. We need to convert it */
564 residency = exit_time - entry_time;
565 do_div(residency, 48);
566
567 seq_puts(s, "=== S0ix statistics ===\n");
568 seq_printf(s, "S0ix Entry Time: %lld\n", entry_time);
569 seq_printf(s, "S0ix Exit Time: %lld\n", exit_time);
570 seq_printf(s, "Residency Time: %lld\n", residency);
571
572 return 0;
573}
574DEFINE_SHOW_ATTRIBUTE(s0ix_stats);
575
576static int amd_pmc_idlemask_read(struct amd_pmc_dev *pdev, struct device *dev,
577 struct seq_file *s)
578{
579 u32 val;
580 int rc;
581
582 switch (pdev->cpu_id) {
583 case AMD_CPU_ID_CZN:
584 /* we haven't yet read SMU version */
585 if (!pdev->major) {
586 rc = amd_pmc_get_smu_version(pdev);
587 if (rc)
588 return rc;
589 }
590 if (pdev->major > 56 || (pdev->major >= 55 && pdev->minor >= 37))
591 val = amd_pmc_reg_read(pdev, AMD_PMC_SCRATCH_REG_CZN);
592 else
593 return -EINVAL;
594 break;
595 case AMD_CPU_ID_YC:
596 case AMD_CPU_ID_CB:
597 case AMD_CPU_ID_PS:
598 val = amd_pmc_reg_read(pdev, AMD_PMC_SCRATCH_REG_YC);
599 break;
600 case PCI_DEVICE_ID_AMD_1AH_M20H_ROOT:
601 case PCI_DEVICE_ID_AMD_1AH_M60H_ROOT:
602 val = amd_pmc_reg_read(pdev, AMD_PMC_SCRATCH_REG_1AH);
603 break;
604 default:
605 return -EINVAL;
606 }
607
608 if (dev)
609 pm_pr_dbg("SMU idlemask s0i3: 0x%x\n", val);
610
611 if (s)
612 seq_printf(s, "SMU idlemask : 0x%x\n", val);
613
614 return 0;
615}
616
617static int amd_pmc_idlemask_show(struct seq_file *s, void *unused)
618{
619 return amd_pmc_idlemask_read(s->private, NULL, s);
620}
621DEFINE_SHOW_ATTRIBUTE(amd_pmc_idlemask);
622
623static void amd_pmc_dbgfs_unregister(struct amd_pmc_dev *dev)
624{
625 debugfs_remove_recursive(dev->dbgfs_dir);
626}
627
628static bool amd_pmc_is_stb_supported(struct amd_pmc_dev *dev)
629{
630 switch (dev->cpu_id) {
631 case AMD_CPU_ID_YC:
632 case AMD_CPU_ID_CB:
633 case AMD_CPU_ID_PS:
634 case PCI_DEVICE_ID_AMD_1AH_M20H_ROOT:
635 case PCI_DEVICE_ID_AMD_1AH_M60H_ROOT:
636 return true;
637 default:
638 return false;
639 }
640}
641
642static void amd_pmc_dbgfs_register(struct amd_pmc_dev *dev)
643{
644 dev->dbgfs_dir = debugfs_create_dir("amd_pmc", NULL);
645 debugfs_create_file("smu_fw_info", 0644, dev->dbgfs_dir, dev,
646 &smu_fw_info_fops);
647 debugfs_create_file("s0ix_stats", 0644, dev->dbgfs_dir, dev,
648 &s0ix_stats_fops);
649 debugfs_create_file("amd_pmc_idlemask", 0644, dev->dbgfs_dir, dev,
650 &amd_pmc_idlemask_fops);
651 /* Enable STB only when the module_param is set */
652 if (enable_stb) {
653 if (amd_pmc_is_stb_supported(dev))
654 debugfs_create_file("stb_read", 0644, dev->dbgfs_dir, dev,
655 &amd_pmc_stb_debugfs_fops_v2);
656 else
657 debugfs_create_file("stb_read", 0644, dev->dbgfs_dir, dev,
658 &amd_pmc_stb_debugfs_fops);
659 }
660}
661
662static void amd_pmc_dump_registers(struct amd_pmc_dev *dev)
663{
664 u32 value, message, argument, response;
665
666 if (dev->msg_port) {
667 message = AMD_S2D_REGISTER_MESSAGE;
668 argument = AMD_S2D_REGISTER_ARGUMENT;
669 response = AMD_S2D_REGISTER_RESPONSE;
670 } else {
671 message = dev->smu_msg;
672 argument = AMD_PMC_REGISTER_ARGUMENT;
673 response = AMD_PMC_REGISTER_RESPONSE;
674 }
675
676 value = amd_pmc_reg_read(dev, response);
677 dev_dbg(dev->dev, "AMD_%s_REGISTER_RESPONSE:%x\n", dev->msg_port ? "S2D" : "PMC", value);
678
679 value = amd_pmc_reg_read(dev, argument);
680 dev_dbg(dev->dev, "AMD_%s_REGISTER_ARGUMENT:%x\n", dev->msg_port ? "S2D" : "PMC", value);
681
682 value = amd_pmc_reg_read(dev, message);
683 dev_dbg(dev->dev, "AMD_%s_REGISTER_MESSAGE:%x\n", dev->msg_port ? "S2D" : "PMC", value);
684}
685
686static int amd_pmc_send_cmd(struct amd_pmc_dev *dev, u32 arg, u32 *data, u8 msg, bool ret)
687{
688 int rc;
689 u32 val, message, argument, response;
690
691 mutex_lock(&dev->lock);
692
693 if (dev->msg_port) {
694 message = AMD_S2D_REGISTER_MESSAGE;
695 argument = AMD_S2D_REGISTER_ARGUMENT;
696 response = AMD_S2D_REGISTER_RESPONSE;
697 } else {
698 message = dev->smu_msg;
699 argument = AMD_PMC_REGISTER_ARGUMENT;
700 response = AMD_PMC_REGISTER_RESPONSE;
701 }
702
703 /* Wait until we get a valid response */
704 rc = readx_poll_timeout(ioread32, dev->regbase + response,
705 val, val != 0, PMC_MSG_DELAY_MIN_US,
706 PMC_MSG_DELAY_MIN_US * RESPONSE_REGISTER_LOOP_MAX);
707 if (rc) {
708 dev_err(dev->dev, "failed to talk to SMU\n");
709 goto out_unlock;
710 }
711
712 /* Write zero to response register */
713 amd_pmc_reg_write(dev, response, 0);
714
715 /* Write argument into response register */
716 amd_pmc_reg_write(dev, argument, arg);
717
718 /* Write message ID to message ID register */
719 amd_pmc_reg_write(dev, message, msg);
720
721 /* Wait until we get a valid response */
722 rc = readx_poll_timeout(ioread32, dev->regbase + response,
723 val, val != 0, PMC_MSG_DELAY_MIN_US,
724 PMC_MSG_DELAY_MIN_US * RESPONSE_REGISTER_LOOP_MAX);
725 if (rc) {
726 dev_err(dev->dev, "SMU response timed out\n");
727 goto out_unlock;
728 }
729
730 switch (val) {
731 case AMD_PMC_RESULT_OK:
732 if (ret) {
733 /* PMFW may take longer time to return back the data */
734 usleep_range(DELAY_MIN_US, 10 * DELAY_MAX_US);
735 *data = amd_pmc_reg_read(dev, argument);
736 }
737 break;
738 case AMD_PMC_RESULT_CMD_REJECT_BUSY:
739 dev_err(dev->dev, "SMU not ready. err: 0x%x\n", val);
740 rc = -EBUSY;
741 goto out_unlock;
742 case AMD_PMC_RESULT_CMD_UNKNOWN:
743 dev_err(dev->dev, "SMU cmd unknown. err: 0x%x\n", val);
744 rc = -EINVAL;
745 goto out_unlock;
746 case AMD_PMC_RESULT_CMD_REJECT_PREREQ:
747 case AMD_PMC_RESULT_FAILED:
748 default:
749 dev_err(dev->dev, "SMU cmd failed. err: 0x%x\n", val);
750 rc = -EIO;
751 goto out_unlock;
752 }
753
754out_unlock:
755 mutex_unlock(&dev->lock);
756 amd_pmc_dump_registers(dev);
757 return rc;
758}
759
760static int amd_pmc_get_os_hint(struct amd_pmc_dev *dev)
761{
762 switch (dev->cpu_id) {
763 case AMD_CPU_ID_PCO:
764 return MSG_OS_HINT_PCO;
765 case AMD_CPU_ID_RN:
766 case AMD_CPU_ID_YC:
767 case AMD_CPU_ID_CB:
768 case AMD_CPU_ID_PS:
769 case PCI_DEVICE_ID_AMD_1AH_M20H_ROOT:
770 case PCI_DEVICE_ID_AMD_1AH_M60H_ROOT:
771 return MSG_OS_HINT_RN;
772 }
773 return -EINVAL;
774}
775
776static int amd_pmc_wa_irq1(struct amd_pmc_dev *pdev)
777{
778 struct device *d;
779 int rc;
780
781 /* cezanne platform firmware has a fix in 64.66.0 */
782 if (pdev->cpu_id == AMD_CPU_ID_CZN) {
783 if (!pdev->major) {
784 rc = amd_pmc_get_smu_version(pdev);
785 if (rc)
786 return rc;
787 }
788
789 if (pdev->major > 64 || (pdev->major == 64 && pdev->minor > 65))
790 return 0;
791 }
792
793 d = bus_find_device_by_name(&serio_bus, NULL, "serio0");
794 if (!d)
795 return 0;
796 if (device_may_wakeup(d)) {
797 dev_info_once(d, "Disabling IRQ1 wakeup source to avoid platform firmware bug\n");
798 disable_irq_wake(1);
799 device_set_wakeup_enable(d, false);
800 }
801 put_device(d);
802
803 return 0;
804}
805
806static int amd_pmc_verify_czn_rtc(struct amd_pmc_dev *pdev, u32 *arg)
807{
808 struct rtc_device *rtc_device;
809 time64_t then, now, duration;
810 struct rtc_wkalrm alarm;
811 struct rtc_time tm;
812 int rc;
813
814 /* we haven't yet read SMU version */
815 if (!pdev->major) {
816 rc = amd_pmc_get_smu_version(pdev);
817 if (rc)
818 return rc;
819 }
820
821 if (pdev->major < 64 || (pdev->major == 64 && pdev->minor < 53))
822 return 0;
823
824 rtc_device = rtc_class_open("rtc0");
825 if (!rtc_device)
826 return 0;
827 rc = rtc_read_alarm(rtc_device, &alarm);
828 if (rc)
829 return rc;
830 if (!alarm.enabled) {
831 dev_dbg(pdev->dev, "alarm not enabled\n");
832 return 0;
833 }
834 rc = rtc_read_time(rtc_device, &tm);
835 if (rc)
836 return rc;
837 then = rtc_tm_to_time64(&alarm.time);
838 now = rtc_tm_to_time64(&tm);
839 duration = then-now;
840
841 /* in the past */
842 if (then < now)
843 return 0;
844
845 /* will be stored in upper 16 bits of s0i3 hint argument,
846 * so timer wakeup from s0i3 is limited to ~18 hours or less
847 */
848 if (duration <= 4 || duration > U16_MAX)
849 return -EINVAL;
850
851 *arg |= (duration << 16);
852 rc = rtc_alarm_irq_enable(rtc_device, 0);
853 pm_pr_dbg("wakeup timer programmed for %lld seconds\n", duration);
854
855 return rc;
856}
857
858static void amd_pmc_s2idle_prepare(void)
859{
860 struct amd_pmc_dev *pdev = &pmc;
861 int rc;
862 u8 msg;
863 u32 arg = 1;
864
865 /* Reset and Start SMU logging - to monitor the s0i3 stats */
866 amd_pmc_setup_smu_logging(pdev);
867
868 /* Activate CZN specific platform bug workarounds */
869 if (pdev->cpu_id == AMD_CPU_ID_CZN && !disable_workarounds) {
870 rc = amd_pmc_verify_czn_rtc(pdev, &arg);
871 if (rc) {
872 dev_err(pdev->dev, "failed to set RTC: %d\n", rc);
873 return;
874 }
875 }
876
877 msg = amd_pmc_get_os_hint(pdev);
878 rc = amd_pmc_send_cmd(pdev, arg, NULL, msg, false);
879 if (rc) {
880 dev_err(pdev->dev, "suspend failed: %d\n", rc);
881 return;
882 }
883
884 rc = amd_pmc_write_stb(pdev, AMD_PMC_STB_S2IDLE_PREPARE);
885 if (rc)
886 dev_err(pdev->dev, "error writing to STB: %d\n", rc);
887}
888
889static void amd_pmc_s2idle_check(void)
890{
891 struct amd_pmc_dev *pdev = &pmc;
892 struct smu_metrics table;
893 int rc;
894
895 /* CZN: Ensure that future s0i3 entry attempts at least 10ms passed */
896 if (pdev->cpu_id == AMD_CPU_ID_CZN && !get_metrics_table(pdev, &table) &&
897 table.s0i3_last_entry_status)
898 usleep_range(10000, 20000);
899
900 /* Dump the IdleMask before we add to the STB */
901 amd_pmc_idlemask_read(pdev, pdev->dev, NULL);
902
903 rc = amd_pmc_write_stb(pdev, AMD_PMC_STB_S2IDLE_CHECK);
904 if (rc)
905 dev_err(pdev->dev, "error writing to STB: %d\n", rc);
906}
907
908static int amd_pmc_dump_data(struct amd_pmc_dev *pdev)
909{
910 if (pdev->cpu_id == AMD_CPU_ID_PCO)
911 return -ENODEV;
912
913 return amd_pmc_send_cmd(pdev, 0, NULL, SMU_MSG_LOG_DUMP_DATA, false);
914}
915
916static void amd_pmc_s2idle_restore(void)
917{
918 struct amd_pmc_dev *pdev = &pmc;
919 int rc;
920 u8 msg;
921
922 msg = amd_pmc_get_os_hint(pdev);
923 rc = amd_pmc_send_cmd(pdev, 0, NULL, msg, false);
924 if (rc)
925 dev_err(pdev->dev, "resume failed: %d\n", rc);
926
927 /* Let SMU know that we are looking for stats */
928 amd_pmc_dump_data(pdev);
929
930 rc = amd_pmc_write_stb(pdev, AMD_PMC_STB_S2IDLE_RESTORE);
931 if (rc)
932 dev_err(pdev->dev, "error writing to STB: %d\n", rc);
933
934 /* Notify on failed entry */
935 amd_pmc_validate_deepest(pdev);
936
937 amd_pmc_process_restore_quirks(pdev);
938}
939
940static struct acpi_s2idle_dev_ops amd_pmc_s2idle_dev_ops = {
941 .prepare = amd_pmc_s2idle_prepare,
942 .check = amd_pmc_s2idle_check,
943 .restore = amd_pmc_s2idle_restore,
944};
945
946static int amd_pmc_suspend_handler(struct device *dev)
947{
948 struct amd_pmc_dev *pdev = dev_get_drvdata(dev);
949
950 /*
951 * Must be called only from the same set of dev_pm_ops handlers
952 * as i8042_pm_suspend() is called: currently just from .suspend.
953 */
954 if (pdev->disable_8042_wakeup && !disable_workarounds) {
955 int rc = amd_pmc_wa_irq1(pdev);
956
957 if (rc) {
958 dev_err(pdev->dev, "failed to adjust keyboard wakeup: %d\n", rc);
959 return rc;
960 }
961 }
962
963 return 0;
964}
965
966static const struct dev_pm_ops amd_pmc_pm = {
967 .suspend = amd_pmc_suspend_handler,
968};
969
970static const struct pci_device_id pmc_pci_ids[] = {
971 { PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_PS) },
972 { PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_CB) },
973 { PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_YC) },
974 { PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_CZN) },
975 { PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_RN) },
976 { PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_PCO) },
977 { PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_RV) },
978 { PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_SP) },
979 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M20H_ROOT) },
980 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M60H_ROOT) },
981 { }
982};
983
984static int amd_pmc_s2d_init(struct amd_pmc_dev *dev)
985{
986 u32 phys_addr_low, phys_addr_hi;
987 u64 stb_phys_addr;
988 u32 size = 0;
989 int ret;
990
991 /* Spill to DRAM feature uses separate SMU message port */
992 dev->msg_port = 1;
993
994 amd_pmc_send_cmd(dev, S2D_TELEMETRY_SIZE, &size, dev->s2d_msg_id, true);
995 if (size != S2D_TELEMETRY_BYTES_MAX)
996 return -EIO;
997
998 /* Get DRAM size */
999 ret = amd_pmc_send_cmd(dev, S2D_DRAM_SIZE, &dev->dram_size, dev->s2d_msg_id, true);
1000 if (ret || !dev->dram_size)
1001 dev->dram_size = S2D_TELEMETRY_DRAMBYTES_MAX;
1002
1003 /* Get STB DRAM address */
1004 amd_pmc_send_cmd(dev, S2D_PHYS_ADDR_LOW, &phys_addr_low, dev->s2d_msg_id, true);
1005 amd_pmc_send_cmd(dev, S2D_PHYS_ADDR_HIGH, &phys_addr_hi, dev->s2d_msg_id, true);
1006
1007 if (!phys_addr_hi && !phys_addr_low) {
1008 dev_err(dev->dev, "STB is not enabled on the system; disable enable_stb or contact system vendor\n");
1009 return -EINVAL;
1010 }
1011
1012 stb_phys_addr = ((u64)phys_addr_hi << 32 | phys_addr_low);
1013
1014 /* Clear msg_port for other SMU operation */
1015 dev->msg_port = 0;
1016
1017 dev->stb_virt_addr = devm_ioremap(dev->dev, stb_phys_addr, dev->dram_size);
1018 if (!dev->stb_virt_addr)
1019 return -ENOMEM;
1020
1021 return 0;
1022}
1023
1024static int amd_pmc_write_stb(struct amd_pmc_dev *dev, u32 data)
1025{
1026 int err;
1027
1028 err = amd_smn_write(0, AMD_PMC_STB_PMI_0, data);
1029 if (err) {
1030 dev_err(dev->dev, "failed to write data in stb: 0x%X\n", AMD_PMC_STB_PMI_0);
1031 return pcibios_err_to_errno(err);
1032 }
1033
1034 return 0;
1035}
1036
1037static int amd_pmc_read_stb(struct amd_pmc_dev *dev, u32 *buf)
1038{
1039 int i, err;
1040
1041 for (i = 0; i < FIFO_SIZE; i++) {
1042 err = amd_smn_read(0, AMD_PMC_STB_PMI_0, buf++);
1043 if (err) {
1044 dev_err(dev->dev, "error reading data from stb: 0x%X\n", AMD_PMC_STB_PMI_0);
1045 return pcibios_err_to_errno(err);
1046 }
1047 }
1048
1049 return 0;
1050}
1051
1052static int amd_pmc_probe(struct platform_device *pdev)
1053{
1054 struct amd_pmc_dev *dev = &pmc;
1055 struct pci_dev *rdev;
1056 u32 base_addr_lo, base_addr_hi;
1057 u64 base_addr;
1058 int err;
1059 u32 val;
1060
1061 dev->dev = &pdev->dev;
1062
1063 rdev = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(0, 0));
1064 if (!rdev || !pci_match_id(pmc_pci_ids, rdev)) {
1065 err = -ENODEV;
1066 goto err_pci_dev_put;
1067 }
1068
1069 dev->cpu_id = rdev->device;
1070
1071 if (dev->cpu_id == AMD_CPU_ID_SP) {
1072 dev_warn_once(dev->dev, "S0i3 is not supported on this hardware\n");
1073 err = -ENODEV;
1074 goto err_pci_dev_put;
1075 }
1076
1077 dev->rdev = rdev;
1078 err = amd_smn_read(0, AMD_PMC_BASE_ADDR_LO, &val);
1079 if (err) {
1080 dev_err(dev->dev, "error reading 0x%x\n", AMD_PMC_BASE_ADDR_LO);
1081 err = pcibios_err_to_errno(err);
1082 goto err_pci_dev_put;
1083 }
1084
1085 base_addr_lo = val & AMD_PMC_BASE_ADDR_HI_MASK;
1086
1087 err = amd_smn_read(0, AMD_PMC_BASE_ADDR_HI, &val);
1088 if (err) {
1089 dev_err(dev->dev, "error reading 0x%x\n", AMD_PMC_BASE_ADDR_HI);
1090 err = pcibios_err_to_errno(err);
1091 goto err_pci_dev_put;
1092 }
1093
1094 base_addr_hi = val & AMD_PMC_BASE_ADDR_LO_MASK;
1095 base_addr = ((u64)base_addr_hi << 32 | base_addr_lo);
1096
1097 dev->regbase = devm_ioremap(dev->dev, base_addr + AMD_PMC_BASE_ADDR_OFFSET,
1098 AMD_PMC_MAPPING_SIZE);
1099 if (!dev->regbase) {
1100 err = -ENOMEM;
1101 goto err_pci_dev_put;
1102 }
1103
1104 mutex_init(&dev->lock);
1105
1106 /* Get num of IP blocks within the SoC */
1107 amd_pmc_get_ip_info(dev);
1108
1109 if (enable_stb && amd_pmc_is_stb_supported(dev)) {
1110 err = amd_pmc_s2d_init(dev);
1111 if (err)
1112 goto err_pci_dev_put;
1113 }
1114
1115 platform_set_drvdata(pdev, dev);
1116 if (IS_ENABLED(CONFIG_SUSPEND)) {
1117 err = acpi_register_lps0_dev(&amd_pmc_s2idle_dev_ops);
1118 if (err)
1119 dev_warn(dev->dev, "failed to register LPS0 sleep handler, expect increased power consumption\n");
1120 if (!disable_workarounds)
1121 amd_pmc_quirks_init(dev);
1122 }
1123
1124 amd_pmc_dbgfs_register(dev);
1125 if (IS_ENABLED(CONFIG_AMD_MP2_STB))
1126 amd_mp2_stb_init(dev);
1127 pm_report_max_hw_sleep(U64_MAX);
1128 return 0;
1129
1130err_pci_dev_put:
1131 pci_dev_put(rdev);
1132 return err;
1133}
1134
1135static void amd_pmc_remove(struct platform_device *pdev)
1136{
1137 struct amd_pmc_dev *dev = platform_get_drvdata(pdev);
1138
1139 if (IS_ENABLED(CONFIG_SUSPEND))
1140 acpi_unregister_lps0_dev(&amd_pmc_s2idle_dev_ops);
1141 amd_pmc_dbgfs_unregister(dev);
1142 pci_dev_put(dev->rdev);
1143 if (IS_ENABLED(CONFIG_AMD_MP2_STB))
1144 amd_mp2_stb_deinit(dev);
1145 mutex_destroy(&dev->lock);
1146}
1147
1148static const struct acpi_device_id amd_pmc_acpi_ids[] = {
1149 {"AMDI0005", 0},
1150 {"AMDI0006", 0},
1151 {"AMDI0007", 0},
1152 {"AMDI0008", 0},
1153 {"AMDI0009", 0},
1154 {"AMDI000A", 0},
1155 {"AMDI000B", 0},
1156 {"AMD0004", 0},
1157 {"AMD0005", 0},
1158 { }
1159};
1160MODULE_DEVICE_TABLE(acpi, amd_pmc_acpi_ids);
1161
1162static struct platform_driver amd_pmc_driver = {
1163 .driver = {
1164 .name = "amd_pmc",
1165 .acpi_match_table = amd_pmc_acpi_ids,
1166 .dev_groups = pmc_groups,
1167 .pm = pm_sleep_ptr(&amd_pmc_pm),
1168 },
1169 .probe = amd_pmc_probe,
1170 .remove = amd_pmc_remove,
1171};
1172module_platform_driver(amd_pmc_driver);
1173
1174MODULE_LICENSE("GPL v2");
1175MODULE_DESCRIPTION("AMD PMC Driver");