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10#include <linux/acpi.h>
11#include <linux/clkdev.h>
12#include <linux/clk-provider.h>
13#include <linux/dmi.h>
14#include <linux/err.h>
15#include <linux/io.h>
16#include <linux/mutex.h>
17#include <linux/pci.h>
18#include <linux/platform_device.h>
19#include <linux/platform_data/x86/clk-lpss.h>
20#include <linux/platform_data/x86/pmc_atom.h>
21#include <linux/pm_domain.h>
22#include <linux/pm_runtime.h>
23#include <linux/pwm.h>
24#include <linux/suspend.h>
25#include <linux/delay.h>
26
27#include "internal.h"
28
29ACPI_MODULE_NAME("acpi_lpss");
30
31#ifdef CONFIG_X86_INTEL_LPSS
32
33#include <asm/cpu_device_id.h>
34#include <asm/intel-family.h>
35#include <asm/iosf_mbi.h>
36
37#define LPSS_ADDR(desc) ((unsigned long)&desc)
38
39#define LPSS_CLK_SIZE 0x04
40#define LPSS_LTR_SIZE 0x18
41
42
43#define LPSS_CLK_DIVIDER_DEF_MASK (BIT(1) | BIT(16))
44#define LPSS_RESETS 0x04
45#define LPSS_RESETS_RESET_FUNC BIT(0)
46#define LPSS_RESETS_RESET_APB BIT(1)
47#define LPSS_GENERAL 0x08
48#define LPSS_GENERAL_LTR_MODE_SW BIT(2)
49#define LPSS_GENERAL_UART_RTS_OVRD BIT(3)
50#define LPSS_SW_LTR 0x10
51#define LPSS_AUTO_LTR 0x14
52#define LPSS_LTR_SNOOP_REQ BIT(15)
53#define LPSS_LTR_SNOOP_MASK 0x0000FFFF
54#define LPSS_LTR_SNOOP_LAT_1US 0x800
55#define LPSS_LTR_SNOOP_LAT_32US 0xC00
56#define LPSS_LTR_SNOOP_LAT_SHIFT 5
57#define LPSS_LTR_SNOOP_LAT_CUTOFF 3000
58#define LPSS_LTR_MAX_VAL 0x3FF
59#define LPSS_TX_INT 0x20
60#define LPSS_TX_INT_MASK BIT(1)
61
62#define LPSS_PRV_REG_COUNT 9
63
64
65#define LPSS_CLK BIT(0)
66#define LPSS_CLK_GATE BIT(1)
67#define LPSS_CLK_DIVIDER BIT(2)
68#define LPSS_LTR BIT(3)
69#define LPSS_SAVE_CTX BIT(4)
70#define LPSS_NO_D3_DELAY BIT(5)
71
72struct lpss_private_data;
73
74struct lpss_device_desc {
75 unsigned int flags;
76 const char *clk_con_id;
77 unsigned int prv_offset;
78 size_t prv_size_override;
79 struct property_entry *properties;
80 void (*setup)(struct lpss_private_data *pdata);
81 bool resume_from_noirq;
82};
83
84static const struct lpss_device_desc lpss_dma_desc = {
85 .flags = LPSS_CLK,
86};
87
88struct lpss_private_data {
89 struct acpi_device *adev;
90 void __iomem *mmio_base;
91 resource_size_t mmio_size;
92 unsigned int fixed_clk_rate;
93 struct clk *clk;
94 const struct lpss_device_desc *dev_desc;
95 u32 prv_reg_ctx[LPSS_PRV_REG_COUNT];
96};
97
98
99static u32 pmc_atom_d3_mask = 0xfe000ffe;
100
101
102static unsigned int lpss_quirks;
103
104
105
106
107
108
109
110
111
112
113
114
115
116#define LPSS_QUIRK_ALWAYS_POWER_ON BIT(0)
117
118
119#define LPSS_UART_CPR 0xF4
120#define LPSS_UART_CPR_AFCE BIT(4)
121
122static void lpss_uart_setup(struct lpss_private_data *pdata)
123{
124 unsigned int offset;
125 u32 val;
126
127 offset = pdata->dev_desc->prv_offset + LPSS_TX_INT;
128 val = readl(pdata->mmio_base + offset);
129 writel(val | LPSS_TX_INT_MASK, pdata->mmio_base + offset);
130
131 val = readl(pdata->mmio_base + LPSS_UART_CPR);
132 if (!(val & LPSS_UART_CPR_AFCE)) {
133 offset = pdata->dev_desc->prv_offset + LPSS_GENERAL;
134 val = readl(pdata->mmio_base + offset);
135 val |= LPSS_GENERAL_UART_RTS_OVRD;
136 writel(val, pdata->mmio_base + offset);
137 }
138}
139
140static void lpss_deassert_reset(struct lpss_private_data *pdata)
141{
142 unsigned int offset;
143 u32 val;
144
145 offset = pdata->dev_desc->prv_offset + LPSS_RESETS;
146 val = readl(pdata->mmio_base + offset);
147 val |= LPSS_RESETS_RESET_APB | LPSS_RESETS_RESET_FUNC;
148 writel(val, pdata->mmio_base + offset);
149}
150
151
152
153
154
155static struct pwm_lookup byt_pwm_lookup[] = {
156 PWM_LOOKUP_WITH_MODULE("80860F09:00", 0, "0000:00:02.0",
157 "pwm_soc_backlight", 0, PWM_POLARITY_NORMAL,
158 "pwm-lpss-platform"),
159};
160
161static void byt_pwm_setup(struct lpss_private_data *pdata)
162{
163 struct acpi_device *adev = pdata->adev;
164
165
166 if (!adev->pnp.unique_id || strcmp(adev->pnp.unique_id, "1"))
167 return;
168
169 pwm_add_table(byt_pwm_lookup, ARRAY_SIZE(byt_pwm_lookup));
170}
171
172#define LPSS_I2C_ENABLE 0x6c
173
174static void byt_i2c_setup(struct lpss_private_data *pdata)
175{
176 const char *uid_str = acpi_device_uid(pdata->adev);
177 acpi_handle handle = pdata->adev->handle;
178 unsigned long long shared_host = 0;
179 acpi_status status;
180 long uid = 0;
181
182
183 if (uid_str)
184 uid = simple_strtol(uid_str, NULL, 10);
185
186
187 status = acpi_evaluate_integer(handle, "_SEM", NULL, &shared_host);
188 if (ACPI_SUCCESS(status) && shared_host && uid)
189 pmc_atom_d3_mask &= ~(BIT_LPSS2_F1_I2C1 << (uid - 1));
190
191 lpss_deassert_reset(pdata);
192
193 if (readl(pdata->mmio_base + pdata->dev_desc->prv_offset))
194 pdata->fixed_clk_rate = 133000000;
195
196 writel(0, pdata->mmio_base + LPSS_I2C_ENABLE);
197}
198
199
200static struct pwm_lookup bsw_pwm_lookup[] = {
201 PWM_LOOKUP_WITH_MODULE("80862288:00", 0, "0000:00:02.0",
202 "pwm_soc_backlight", 0, PWM_POLARITY_NORMAL,
203 "pwm-lpss-platform"),
204};
205
206static void bsw_pwm_setup(struct lpss_private_data *pdata)
207{
208 struct acpi_device *adev = pdata->adev;
209
210
211 if (!adev->pnp.unique_id || strcmp(adev->pnp.unique_id, "1"))
212 return;
213
214 pwm_add_table(bsw_pwm_lookup, ARRAY_SIZE(bsw_pwm_lookup));
215}
216
217static const struct lpss_device_desc lpt_dev_desc = {
218 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_LTR
219 | LPSS_SAVE_CTX,
220 .prv_offset = 0x800,
221};
222
223static const struct lpss_device_desc lpt_i2c_dev_desc = {
224 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_LTR | LPSS_SAVE_CTX,
225 .prv_offset = 0x800,
226};
227
228static struct property_entry uart_properties[] = {
229 PROPERTY_ENTRY_U32("reg-io-width", 4),
230 PROPERTY_ENTRY_U32("reg-shift", 2),
231 PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
232 { },
233};
234
235static const struct lpss_device_desc lpt_uart_dev_desc = {
236 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_LTR
237 | LPSS_SAVE_CTX,
238 .clk_con_id = "baudclk",
239 .prv_offset = 0x800,
240 .setup = lpss_uart_setup,
241 .properties = uart_properties,
242};
243
244static const struct lpss_device_desc lpt_sdio_dev_desc = {
245 .flags = LPSS_LTR,
246 .prv_offset = 0x1000,
247 .prv_size_override = 0x1018,
248};
249
250static const struct lpss_device_desc byt_pwm_dev_desc = {
251 .flags = LPSS_SAVE_CTX,
252 .prv_offset = 0x800,
253 .setup = byt_pwm_setup,
254};
255
256static const struct lpss_device_desc bsw_pwm_dev_desc = {
257 .flags = LPSS_SAVE_CTX | LPSS_NO_D3_DELAY,
258 .prv_offset = 0x800,
259 .setup = bsw_pwm_setup,
260};
261
262static const struct lpss_device_desc byt_uart_dev_desc = {
263 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX,
264 .clk_con_id = "baudclk",
265 .prv_offset = 0x800,
266 .setup = lpss_uart_setup,
267 .properties = uart_properties,
268};
269
270static const struct lpss_device_desc bsw_uart_dev_desc = {
271 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX
272 | LPSS_NO_D3_DELAY,
273 .clk_con_id = "baudclk",
274 .prv_offset = 0x800,
275 .setup = lpss_uart_setup,
276 .properties = uart_properties,
277};
278
279static const struct lpss_device_desc byt_spi_dev_desc = {
280 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX,
281 .prv_offset = 0x400,
282};
283
284static const struct lpss_device_desc byt_sdio_dev_desc = {
285 .flags = LPSS_CLK,
286};
287
288static const struct lpss_device_desc byt_i2c_dev_desc = {
289 .flags = LPSS_CLK | LPSS_SAVE_CTX,
290 .prv_offset = 0x800,
291 .setup = byt_i2c_setup,
292 .resume_from_noirq = true,
293};
294
295static const struct lpss_device_desc bsw_i2c_dev_desc = {
296 .flags = LPSS_CLK | LPSS_SAVE_CTX | LPSS_NO_D3_DELAY,
297 .prv_offset = 0x800,
298 .setup = byt_i2c_setup,
299 .resume_from_noirq = true,
300};
301
302static const struct lpss_device_desc bsw_spi_dev_desc = {
303 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX
304 | LPSS_NO_D3_DELAY,
305 .prv_offset = 0x400,
306 .setup = lpss_deassert_reset,
307};
308
309#define ICPU(model) { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, }
310
311static const struct x86_cpu_id lpss_cpu_ids[] = {
312 ICPU(INTEL_FAM6_ATOM_SILVERMONT),
313 ICPU(INTEL_FAM6_ATOM_AIRMONT),
314 {}
315};
316
317#else
318
319#define LPSS_ADDR(desc) (0UL)
320
321#endif
322
323static const struct acpi_device_id acpi_lpss_device_ids[] = {
324
325 { "INTL9C60", LPSS_ADDR(lpss_dma_desc) },
326
327
328 { "INT33C0", LPSS_ADDR(lpt_dev_desc) },
329 { "INT33C1", LPSS_ADDR(lpt_dev_desc) },
330 { "INT33C2", LPSS_ADDR(lpt_i2c_dev_desc) },
331 { "INT33C3", LPSS_ADDR(lpt_i2c_dev_desc) },
332 { "INT33C4", LPSS_ADDR(lpt_uart_dev_desc) },
333 { "INT33C5", LPSS_ADDR(lpt_uart_dev_desc) },
334 { "INT33C6", LPSS_ADDR(lpt_sdio_dev_desc) },
335 { "INT33C7", },
336
337
338 { "80860F09", LPSS_ADDR(byt_pwm_dev_desc) },
339 { "80860F0A", LPSS_ADDR(byt_uart_dev_desc) },
340 { "80860F0E", LPSS_ADDR(byt_spi_dev_desc) },
341 { "80860F14", LPSS_ADDR(byt_sdio_dev_desc) },
342 { "80860F41", LPSS_ADDR(byt_i2c_dev_desc) },
343 { "INT33B2", },
344 { "INT33FC", },
345
346
347 { "80862286", LPSS_ADDR(lpss_dma_desc) },
348 { "80862288", LPSS_ADDR(bsw_pwm_dev_desc) },
349 { "8086228A", LPSS_ADDR(bsw_uart_dev_desc) },
350 { "8086228E", LPSS_ADDR(bsw_spi_dev_desc) },
351 { "808622C0", LPSS_ADDR(lpss_dma_desc) },
352 { "808622C1", LPSS_ADDR(bsw_i2c_dev_desc) },
353
354
355 { "INT3430", LPSS_ADDR(lpt_dev_desc) },
356 { "INT3431", LPSS_ADDR(lpt_dev_desc) },
357 { "INT3432", LPSS_ADDR(lpt_i2c_dev_desc) },
358 { "INT3433", LPSS_ADDR(lpt_i2c_dev_desc) },
359 { "INT3434", LPSS_ADDR(lpt_uart_dev_desc) },
360 { "INT3435", LPSS_ADDR(lpt_uart_dev_desc) },
361 { "INT3436", LPSS_ADDR(lpt_sdio_dev_desc) },
362 { "INT3437", },
363
364
365 { "INT3438", LPSS_ADDR(lpt_dev_desc) },
366
367 { }
368};
369
370#ifdef CONFIG_X86_INTEL_LPSS
371
372static int is_memory(struct acpi_resource *res, void *not_used)
373{
374 struct resource r;
375 return !acpi_dev_resource_memory(res, &r);
376}
377
378
379static struct platform_device *lpss_clk_dev;
380
381static inline void lpt_register_clock_device(void)
382{
383 lpss_clk_dev = platform_device_register_simple("clk-lpt", -1, NULL, 0);
384}
385
386static int register_device_clock(struct acpi_device *adev,
387 struct lpss_private_data *pdata)
388{
389 const struct lpss_device_desc *dev_desc = pdata->dev_desc;
390 const char *devname = dev_name(&adev->dev);
391 struct clk *clk;
392 struct lpss_clk_data *clk_data;
393 const char *parent, *clk_name;
394 void __iomem *prv_base;
395
396 if (!lpss_clk_dev)
397 lpt_register_clock_device();
398
399 clk_data = platform_get_drvdata(lpss_clk_dev);
400 if (!clk_data)
401 return -ENODEV;
402 clk = clk_data->clk;
403
404 if (!pdata->mmio_base
405 || pdata->mmio_size < dev_desc->prv_offset + LPSS_CLK_SIZE)
406 return -ENODATA;
407
408 parent = clk_data->name;
409 prv_base = pdata->mmio_base + dev_desc->prv_offset;
410
411 if (pdata->fixed_clk_rate) {
412 clk = clk_register_fixed_rate(NULL, devname, parent, 0,
413 pdata->fixed_clk_rate);
414 goto out;
415 }
416
417 if (dev_desc->flags & LPSS_CLK_GATE) {
418 clk = clk_register_gate(NULL, devname, parent, 0,
419 prv_base, 0, 0, NULL);
420 parent = devname;
421 }
422
423 if (dev_desc->flags & LPSS_CLK_DIVIDER) {
424
425 if (!readl(prv_base))
426 writel(LPSS_CLK_DIVIDER_DEF_MASK, prv_base);
427
428 clk_name = kasprintf(GFP_KERNEL, "%s-div", devname);
429 if (!clk_name)
430 return -ENOMEM;
431 clk = clk_register_fractional_divider(NULL, clk_name, parent,
432 0, prv_base,
433 1, 15, 16, 15, 0, NULL);
434 parent = clk_name;
435
436 clk_name = kasprintf(GFP_KERNEL, "%s-update", devname);
437 if (!clk_name) {
438 kfree(parent);
439 return -ENOMEM;
440 }
441 clk = clk_register_gate(NULL, clk_name, parent,
442 CLK_SET_RATE_PARENT | CLK_SET_RATE_GATE,
443 prv_base, 31, 0, NULL);
444 kfree(parent);
445 kfree(clk_name);
446 }
447out:
448 if (IS_ERR(clk))
449 return PTR_ERR(clk);
450
451 pdata->clk = clk;
452 clk_register_clkdev(clk, dev_desc->clk_con_id, devname);
453 return 0;
454}
455
456struct lpss_device_links {
457 const char *supplier_hid;
458 const char *supplier_uid;
459 const char *consumer_hid;
460 const char *consumer_uid;
461 u32 flags;
462 const struct dmi_system_id *dep_missing_ids;
463};
464
465
466static const struct dmi_system_id i2c1_dep_missing_dmi_ids[] = {
467 {
468 .matches = {
469 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
470 DMI_MATCH(DMI_PRODUCT_NAME, "T200TA"),
471 },
472 },
473 {}
474};
475
476
477
478
479
480
481
482
483static const struct lpss_device_links lpss_device_links[] = {
484
485 {"808622C1", "7", "80860F14", "3", DL_FLAG_PM_RUNTIME},
486
487 {"808622C1", "7", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME},
488
489 {"80860F41", "1", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME,
490 i2c1_dep_missing_dmi_ids},
491
492 {"80860F41", "5", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME},
493
494 {"80860F41", "7", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME},
495};
496
497static bool acpi_lpss_is_supplier(struct acpi_device *adev,
498 const struct lpss_device_links *link)
499{
500 return acpi_dev_hid_uid_match(adev, link->supplier_hid, link->supplier_uid);
501}
502
503static bool acpi_lpss_is_consumer(struct acpi_device *adev,
504 const struct lpss_device_links *link)
505{
506 return acpi_dev_hid_uid_match(adev, link->consumer_hid, link->consumer_uid);
507}
508
509struct hid_uid {
510 const char *hid;
511 const char *uid;
512};
513
514static int match_hid_uid(struct device *dev, const void *data)
515{
516 struct acpi_device *adev = ACPI_COMPANION(dev);
517 const struct hid_uid *id = data;
518
519 if (!adev)
520 return 0;
521
522 return acpi_dev_hid_uid_match(adev, id->hid, id->uid);
523}
524
525static struct device *acpi_lpss_find_device(const char *hid, const char *uid)
526{
527 struct device *dev;
528
529 struct hid_uid data = {
530 .hid = hid,
531 .uid = uid,
532 };
533
534 dev = bus_find_device(&platform_bus_type, NULL, &data, match_hid_uid);
535 if (dev)
536 return dev;
537
538 return bus_find_device(&pci_bus_type, NULL, &data, match_hid_uid);
539}
540
541static bool acpi_lpss_dep(struct acpi_device *adev, acpi_handle handle)
542{
543 struct acpi_handle_list dep_devices;
544 acpi_status status;
545 int i;
546
547 if (!acpi_has_method(adev->handle, "_DEP"))
548 return false;
549
550 status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
551 &dep_devices);
552 if (ACPI_FAILURE(status)) {
553 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
554 return false;
555 }
556
557 for (i = 0; i < dep_devices.count; i++) {
558 if (dep_devices.handles[i] == handle)
559 return true;
560 }
561
562 return false;
563}
564
565static void acpi_lpss_link_consumer(struct device *dev1,
566 const struct lpss_device_links *link)
567{
568 struct device *dev2;
569
570 dev2 = acpi_lpss_find_device(link->consumer_hid, link->consumer_uid);
571 if (!dev2)
572 return;
573
574 if ((link->dep_missing_ids && dmi_check_system(link->dep_missing_ids))
575 || acpi_lpss_dep(ACPI_COMPANION(dev2), ACPI_HANDLE(dev1)))
576 device_link_add(dev2, dev1, link->flags);
577
578 put_device(dev2);
579}
580
581static void acpi_lpss_link_supplier(struct device *dev1,
582 const struct lpss_device_links *link)
583{
584 struct device *dev2;
585
586 dev2 = acpi_lpss_find_device(link->supplier_hid, link->supplier_uid);
587 if (!dev2)
588 return;
589
590 if ((link->dep_missing_ids && dmi_check_system(link->dep_missing_ids))
591 || acpi_lpss_dep(ACPI_COMPANION(dev1), ACPI_HANDLE(dev2)))
592 device_link_add(dev1, dev2, link->flags);
593
594 put_device(dev2);
595}
596
597static void acpi_lpss_create_device_links(struct acpi_device *adev,
598 struct platform_device *pdev)
599{
600 int i;
601
602 for (i = 0; i < ARRAY_SIZE(lpss_device_links); i++) {
603 const struct lpss_device_links *link = &lpss_device_links[i];
604
605 if (acpi_lpss_is_supplier(adev, link))
606 acpi_lpss_link_consumer(&pdev->dev, link);
607
608 if (acpi_lpss_is_consumer(adev, link))
609 acpi_lpss_link_supplier(&pdev->dev, link);
610 }
611}
612
613static int acpi_lpss_create_device(struct acpi_device *adev,
614 const struct acpi_device_id *id)
615{
616 const struct lpss_device_desc *dev_desc;
617 struct lpss_private_data *pdata;
618 struct resource_entry *rentry;
619 struct list_head resource_list;
620 struct platform_device *pdev;
621 int ret;
622
623 dev_desc = (const struct lpss_device_desc *)id->driver_data;
624 if (!dev_desc) {
625 pdev = acpi_create_platform_device(adev, NULL);
626 return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
627 }
628 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
629 if (!pdata)
630 return -ENOMEM;
631
632 INIT_LIST_HEAD(&resource_list);
633 ret = acpi_dev_get_resources(adev, &resource_list, is_memory, NULL);
634 if (ret < 0)
635 goto err_out;
636
637 list_for_each_entry(rentry, &resource_list, node)
638 if (resource_type(rentry->res) == IORESOURCE_MEM) {
639 if (dev_desc->prv_size_override)
640 pdata->mmio_size = dev_desc->prv_size_override;
641 else
642 pdata->mmio_size = resource_size(rentry->res);
643 pdata->mmio_base = ioremap(rentry->res->start,
644 pdata->mmio_size);
645 break;
646 }
647
648 acpi_dev_free_resource_list(&resource_list);
649
650 if (!pdata->mmio_base) {
651
652 adev->pnp.type.platform_id = 0;
653
654 ret = 0;
655 goto err_out;
656 }
657
658 pdata->adev = adev;
659 pdata->dev_desc = dev_desc;
660
661 if (dev_desc->setup)
662 dev_desc->setup(pdata);
663
664 if (dev_desc->flags & LPSS_CLK) {
665 ret = register_device_clock(adev, pdata);
666 if (ret) {
667
668 ret = 0;
669 goto err_out;
670 }
671 }
672
673
674
675
676
677
678 acpi_device_fix_up_power(adev);
679
680 adev->driver_data = pdata;
681 pdev = acpi_create_platform_device(adev, dev_desc->properties);
682 if (!IS_ERR_OR_NULL(pdev)) {
683 acpi_lpss_create_device_links(adev, pdev);
684 return 1;
685 }
686
687 ret = PTR_ERR(pdev);
688 adev->driver_data = NULL;
689
690 err_out:
691 kfree(pdata);
692 return ret;
693}
694
695static u32 __lpss_reg_read(struct lpss_private_data *pdata, unsigned int reg)
696{
697 return readl(pdata->mmio_base + pdata->dev_desc->prv_offset + reg);
698}
699
700static void __lpss_reg_write(u32 val, struct lpss_private_data *pdata,
701 unsigned int reg)
702{
703 writel(val, pdata->mmio_base + pdata->dev_desc->prv_offset + reg);
704}
705
706static int lpss_reg_read(struct device *dev, unsigned int reg, u32 *val)
707{
708 struct acpi_device *adev;
709 struct lpss_private_data *pdata;
710 unsigned long flags;
711 int ret;
712
713 ret = acpi_bus_get_device(ACPI_HANDLE(dev), &adev);
714 if (WARN_ON(ret))
715 return ret;
716
717 spin_lock_irqsave(&dev->power.lock, flags);
718 if (pm_runtime_suspended(dev)) {
719 ret = -EAGAIN;
720 goto out;
721 }
722 pdata = acpi_driver_data(adev);
723 if (WARN_ON(!pdata || !pdata->mmio_base)) {
724 ret = -ENODEV;
725 goto out;
726 }
727 *val = __lpss_reg_read(pdata, reg);
728
729 out:
730 spin_unlock_irqrestore(&dev->power.lock, flags);
731 return ret;
732}
733
734static ssize_t lpss_ltr_show(struct device *dev, struct device_attribute *attr,
735 char *buf)
736{
737 u32 ltr_value = 0;
738 unsigned int reg;
739 int ret;
740
741 reg = strcmp(attr->attr.name, "auto_ltr") ? LPSS_SW_LTR : LPSS_AUTO_LTR;
742 ret = lpss_reg_read(dev, reg, <r_value);
743 if (ret)
744 return ret;
745
746 return snprintf(buf, PAGE_SIZE, "%08x\n", ltr_value);
747}
748
749static ssize_t lpss_ltr_mode_show(struct device *dev,
750 struct device_attribute *attr, char *buf)
751{
752 u32 ltr_mode = 0;
753 char *outstr;
754 int ret;
755
756 ret = lpss_reg_read(dev, LPSS_GENERAL, <r_mode);
757 if (ret)
758 return ret;
759
760 outstr = (ltr_mode & LPSS_GENERAL_LTR_MODE_SW) ? "sw" : "auto";
761 return sprintf(buf, "%s\n", outstr);
762}
763
764static DEVICE_ATTR(auto_ltr, S_IRUSR, lpss_ltr_show, NULL);
765static DEVICE_ATTR(sw_ltr, S_IRUSR, lpss_ltr_show, NULL);
766static DEVICE_ATTR(ltr_mode, S_IRUSR, lpss_ltr_mode_show, NULL);
767
768static struct attribute *lpss_attrs[] = {
769 &dev_attr_auto_ltr.attr,
770 &dev_attr_sw_ltr.attr,
771 &dev_attr_ltr_mode.attr,
772 NULL,
773};
774
775static const struct attribute_group lpss_attr_group = {
776 .attrs = lpss_attrs,
777 .name = "lpss_ltr",
778};
779
780static void acpi_lpss_set_ltr(struct device *dev, s32 val)
781{
782 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
783 u32 ltr_mode, ltr_val;
784
785 ltr_mode = __lpss_reg_read(pdata, LPSS_GENERAL);
786 if (val < 0) {
787 if (ltr_mode & LPSS_GENERAL_LTR_MODE_SW) {
788 ltr_mode &= ~LPSS_GENERAL_LTR_MODE_SW;
789 __lpss_reg_write(ltr_mode, pdata, LPSS_GENERAL);
790 }
791 return;
792 }
793 ltr_val = __lpss_reg_read(pdata, LPSS_SW_LTR) & ~LPSS_LTR_SNOOP_MASK;
794 if (val >= LPSS_LTR_SNOOP_LAT_CUTOFF) {
795 ltr_val |= LPSS_LTR_SNOOP_LAT_32US;
796 val = LPSS_LTR_MAX_VAL;
797 } else if (val > LPSS_LTR_MAX_VAL) {
798 ltr_val |= LPSS_LTR_SNOOP_LAT_32US | LPSS_LTR_SNOOP_REQ;
799 val >>= LPSS_LTR_SNOOP_LAT_SHIFT;
800 } else {
801 ltr_val |= LPSS_LTR_SNOOP_LAT_1US | LPSS_LTR_SNOOP_REQ;
802 }
803 ltr_val |= val;
804 __lpss_reg_write(ltr_val, pdata, LPSS_SW_LTR);
805 if (!(ltr_mode & LPSS_GENERAL_LTR_MODE_SW)) {
806 ltr_mode |= LPSS_GENERAL_LTR_MODE_SW;
807 __lpss_reg_write(ltr_mode, pdata, LPSS_GENERAL);
808 }
809}
810
811#ifdef CONFIG_PM
812
813
814
815
816
817
818
819
820
821static void acpi_lpss_save_ctx(struct device *dev,
822 struct lpss_private_data *pdata)
823{
824 unsigned int i;
825
826 for (i = 0; i < LPSS_PRV_REG_COUNT; i++) {
827 unsigned long offset = i * sizeof(u32);
828
829 pdata->prv_reg_ctx[i] = __lpss_reg_read(pdata, offset);
830 dev_dbg(dev, "saving 0x%08x from LPSS reg at offset 0x%02lx\n",
831 pdata->prv_reg_ctx[i], offset);
832 }
833}
834
835
836
837
838
839
840
841
842static void acpi_lpss_restore_ctx(struct device *dev,
843 struct lpss_private_data *pdata)
844{
845 unsigned int i;
846
847 for (i = 0; i < LPSS_PRV_REG_COUNT; i++) {
848 unsigned long offset = i * sizeof(u32);
849
850 __lpss_reg_write(pdata->prv_reg_ctx[i], pdata, offset);
851 dev_dbg(dev, "restoring 0x%08x to LPSS reg at offset 0x%02lx\n",
852 pdata->prv_reg_ctx[i], offset);
853 }
854}
855
856static void acpi_lpss_d3_to_d0_delay(struct lpss_private_data *pdata)
857{
858
859
860
861
862
863
864 unsigned int delay = 10;
865
866 if (pdata->dev_desc->flags & LPSS_NO_D3_DELAY)
867 delay = 0;
868
869 msleep(delay);
870}
871
872static int acpi_lpss_activate(struct device *dev)
873{
874 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
875 int ret;
876
877 ret = acpi_dev_resume(dev);
878 if (ret)
879 return ret;
880
881 acpi_lpss_d3_to_d0_delay(pdata);
882
883
884
885
886
887
888
889 if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
890 lpss_deassert_reset(pdata);
891
892 return 0;
893}
894
895static void acpi_lpss_dismiss(struct device *dev)
896{
897 acpi_dev_suspend(dev, false);
898}
899
900
901#define LPSS_IOSF_UNIT_LPIOEP 0xA0
902#define LPSS_IOSF_UNIT_LPIO1 0xAB
903#define LPSS_IOSF_UNIT_LPIO2 0xAC
904
905#define LPSS_IOSF_PMCSR 0x84
906#define LPSS_PMCSR_D0 0
907#define LPSS_PMCSR_D3hot 3
908#define LPSS_PMCSR_Dx_MASK GENMASK(1, 0)
909
910#define LPSS_IOSF_GPIODEF0 0x154
911#define LPSS_GPIODEF0_DMA1_D3 BIT(2)
912#define LPSS_GPIODEF0_DMA2_D3 BIT(3)
913#define LPSS_GPIODEF0_DMA_D3_MASK GENMASK(3, 2)
914#define LPSS_GPIODEF0_DMA_LLP BIT(13)
915
916static DEFINE_MUTEX(lpss_iosf_mutex);
917static bool lpss_iosf_d3_entered = true;
918
919static void lpss_iosf_enter_d3_state(void)
920{
921 u32 value1 = 0;
922 u32 mask1 = LPSS_GPIODEF0_DMA_D3_MASK | LPSS_GPIODEF0_DMA_LLP;
923 u32 value2 = LPSS_PMCSR_D3hot;
924 u32 mask2 = LPSS_PMCSR_Dx_MASK;
925
926
927
928
929
930 u32 func_dis, d3_sts_0, pmc_status;
931 int ret;
932
933 ret = pmc_atom_read(PMC_FUNC_DIS, &func_dis);
934 if (ret)
935 return;
936
937 mutex_lock(&lpss_iosf_mutex);
938
939 ret = pmc_atom_read(PMC_D3_STS_0, &d3_sts_0);
940 if (ret)
941 goto exit;
942
943
944
945
946
947
948 pmc_status = (~(d3_sts_0 | func_dis)) & pmc_atom_d3_mask;
949 if (pmc_status)
950 goto exit;
951
952 iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO1, MBI_CFG_WRITE,
953 LPSS_IOSF_PMCSR, value2, mask2);
954
955 iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO2, MBI_CFG_WRITE,
956 LPSS_IOSF_PMCSR, value2, mask2);
957
958 iosf_mbi_modify(LPSS_IOSF_UNIT_LPIOEP, MBI_CR_WRITE,
959 LPSS_IOSF_GPIODEF0, value1, mask1);
960
961 lpss_iosf_d3_entered = true;
962
963exit:
964 mutex_unlock(&lpss_iosf_mutex);
965}
966
967static void lpss_iosf_exit_d3_state(void)
968{
969 u32 value1 = LPSS_GPIODEF0_DMA1_D3 | LPSS_GPIODEF0_DMA2_D3 |
970 LPSS_GPIODEF0_DMA_LLP;
971 u32 mask1 = LPSS_GPIODEF0_DMA_D3_MASK | LPSS_GPIODEF0_DMA_LLP;
972 u32 value2 = LPSS_PMCSR_D0;
973 u32 mask2 = LPSS_PMCSR_Dx_MASK;
974
975 mutex_lock(&lpss_iosf_mutex);
976
977 if (!lpss_iosf_d3_entered)
978 goto exit;
979
980 lpss_iosf_d3_entered = false;
981
982 iosf_mbi_modify(LPSS_IOSF_UNIT_LPIOEP, MBI_CR_WRITE,
983 LPSS_IOSF_GPIODEF0, value1, mask1);
984
985 iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO2, MBI_CFG_WRITE,
986 LPSS_IOSF_PMCSR, value2, mask2);
987
988 iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO1, MBI_CFG_WRITE,
989 LPSS_IOSF_PMCSR, value2, mask2);
990
991exit:
992 mutex_unlock(&lpss_iosf_mutex);
993}
994
995static int acpi_lpss_suspend(struct device *dev, bool wakeup)
996{
997 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
998 int ret;
999
1000 if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
1001 acpi_lpss_save_ctx(dev, pdata);
1002
1003 ret = acpi_dev_suspend(dev, wakeup);
1004
1005
1006
1007
1008
1009
1010 if (acpi_target_system_state() == ACPI_STATE_S0 &&
1011 lpss_quirks & LPSS_QUIRK_ALWAYS_POWER_ON && iosf_mbi_available())
1012 lpss_iosf_enter_d3_state();
1013
1014 return ret;
1015}
1016
1017static int acpi_lpss_resume(struct device *dev)
1018{
1019 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1020 int ret;
1021
1022
1023
1024
1025
1026 if (lpss_quirks & LPSS_QUIRK_ALWAYS_POWER_ON && iosf_mbi_available())
1027 lpss_iosf_exit_d3_state();
1028
1029 ret = acpi_dev_resume(dev);
1030 if (ret)
1031 return ret;
1032
1033 acpi_lpss_d3_to_d0_delay(pdata);
1034
1035 if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
1036 acpi_lpss_restore_ctx(dev, pdata);
1037
1038 return 0;
1039}
1040
1041#ifdef CONFIG_PM_SLEEP
1042static int acpi_lpss_do_suspend_late(struct device *dev)
1043{
1044 int ret;
1045
1046 if (dev_pm_smart_suspend_and_suspended(dev))
1047 return 0;
1048
1049 ret = pm_generic_suspend_late(dev);
1050 return ret ? ret : acpi_lpss_suspend(dev, device_may_wakeup(dev));
1051}
1052
1053static int acpi_lpss_suspend_late(struct device *dev)
1054{
1055 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1056
1057 if (pdata->dev_desc->resume_from_noirq)
1058 return 0;
1059
1060 return acpi_lpss_do_suspend_late(dev);
1061}
1062
1063static int acpi_lpss_suspend_noirq(struct device *dev)
1064{
1065 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1066 int ret;
1067
1068 if (pdata->dev_desc->resume_from_noirq) {
1069
1070
1071
1072
1073
1074
1075
1076 ret = acpi_lpss_do_suspend_late(dev);
1077 if (ret)
1078 return ret;
1079 }
1080
1081 return acpi_subsys_suspend_noirq(dev);
1082}
1083
1084static int acpi_lpss_do_resume_early(struct device *dev)
1085{
1086 int ret = acpi_lpss_resume(dev);
1087
1088 return ret ? ret : pm_generic_resume_early(dev);
1089}
1090
1091static int acpi_lpss_resume_early(struct device *dev)
1092{
1093 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1094
1095 if (pdata->dev_desc->resume_from_noirq)
1096 return 0;
1097
1098 return acpi_lpss_do_resume_early(dev);
1099}
1100
1101static int acpi_lpss_resume_noirq(struct device *dev)
1102{
1103 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1104 int ret;
1105
1106
1107 if (dev_pm_may_skip_resume(dev))
1108 return 0;
1109
1110 if (dev_pm_smart_suspend_and_suspended(dev))
1111 pm_runtime_set_active(dev);
1112
1113 ret = pm_generic_resume_noirq(dev);
1114 if (ret)
1115 return ret;
1116
1117 if (!pdata->dev_desc->resume_from_noirq)
1118 return 0;
1119
1120
1121
1122
1123
1124
1125
1126
1127 return acpi_lpss_do_resume_early(dev);
1128}
1129
1130static int acpi_lpss_do_restore_early(struct device *dev)
1131{
1132 int ret = acpi_lpss_resume(dev);
1133
1134 return ret ? ret : pm_generic_restore_early(dev);
1135}
1136
1137static int acpi_lpss_restore_early(struct device *dev)
1138{
1139 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1140
1141 if (pdata->dev_desc->resume_from_noirq)
1142 return 0;
1143
1144 return acpi_lpss_do_restore_early(dev);
1145}
1146
1147static int acpi_lpss_restore_noirq(struct device *dev)
1148{
1149 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1150 int ret;
1151
1152 ret = pm_generic_restore_noirq(dev);
1153 if (ret)
1154 return ret;
1155
1156 if (!pdata->dev_desc->resume_from_noirq)
1157 return 0;
1158
1159
1160 return acpi_lpss_do_restore_early(dev);
1161}
1162
1163static int acpi_lpss_do_poweroff_late(struct device *dev)
1164{
1165 int ret = pm_generic_poweroff_late(dev);
1166
1167 return ret ? ret : acpi_lpss_suspend(dev, device_may_wakeup(dev));
1168}
1169
1170static int acpi_lpss_poweroff_late(struct device *dev)
1171{
1172 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1173
1174 if (dev_pm_smart_suspend_and_suspended(dev))
1175 return 0;
1176
1177 if (pdata->dev_desc->resume_from_noirq)
1178 return 0;
1179
1180 return acpi_lpss_do_poweroff_late(dev);
1181}
1182
1183static int acpi_lpss_poweroff_noirq(struct device *dev)
1184{
1185 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1186
1187 if (dev_pm_smart_suspend_and_suspended(dev))
1188 return 0;
1189
1190 if (pdata->dev_desc->resume_from_noirq) {
1191
1192 int ret = acpi_lpss_do_poweroff_late(dev);
1193 if (ret)
1194 return ret;
1195 }
1196
1197 return pm_generic_poweroff_noirq(dev);
1198}
1199#endif
1200
1201static int acpi_lpss_runtime_suspend(struct device *dev)
1202{
1203 int ret = pm_generic_runtime_suspend(dev);
1204
1205 return ret ? ret : acpi_lpss_suspend(dev, true);
1206}
1207
1208static int acpi_lpss_runtime_resume(struct device *dev)
1209{
1210 int ret = acpi_lpss_resume(dev);
1211
1212 return ret ? ret : pm_generic_runtime_resume(dev);
1213}
1214#endif
1215
1216static struct dev_pm_domain acpi_lpss_pm_domain = {
1217#ifdef CONFIG_PM
1218 .activate = acpi_lpss_activate,
1219 .dismiss = acpi_lpss_dismiss,
1220#endif
1221 .ops = {
1222#ifdef CONFIG_PM
1223#ifdef CONFIG_PM_SLEEP
1224 .prepare = acpi_subsys_prepare,
1225 .complete = acpi_subsys_complete,
1226 .suspend = acpi_subsys_suspend,
1227 .suspend_late = acpi_lpss_suspend_late,
1228 .suspend_noirq = acpi_lpss_suspend_noirq,
1229 .resume_noirq = acpi_lpss_resume_noirq,
1230 .resume_early = acpi_lpss_resume_early,
1231 .freeze = acpi_subsys_freeze,
1232 .poweroff = acpi_subsys_poweroff,
1233 .poweroff_late = acpi_lpss_poweroff_late,
1234 .poweroff_noirq = acpi_lpss_poweroff_noirq,
1235 .restore_noirq = acpi_lpss_restore_noirq,
1236 .restore_early = acpi_lpss_restore_early,
1237#endif
1238 .runtime_suspend = acpi_lpss_runtime_suspend,
1239 .runtime_resume = acpi_lpss_runtime_resume,
1240#endif
1241 },
1242};
1243
1244static int acpi_lpss_platform_notify(struct notifier_block *nb,
1245 unsigned long action, void *data)
1246{
1247 struct platform_device *pdev = to_platform_device(data);
1248 struct lpss_private_data *pdata;
1249 struct acpi_device *adev;
1250 const struct acpi_device_id *id;
1251
1252 id = acpi_match_device(acpi_lpss_device_ids, &pdev->dev);
1253 if (!id || !id->driver_data)
1254 return 0;
1255
1256 if (acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev))
1257 return 0;
1258
1259 pdata = acpi_driver_data(adev);
1260 if (!pdata)
1261 return 0;
1262
1263 if (pdata->mmio_base &&
1264 pdata->mmio_size < pdata->dev_desc->prv_offset + LPSS_LTR_SIZE) {
1265 dev_err(&pdev->dev, "MMIO size insufficient to access LTR\n");
1266 return 0;
1267 }
1268
1269 switch (action) {
1270 case BUS_NOTIFY_BIND_DRIVER:
1271 dev_pm_domain_set(&pdev->dev, &acpi_lpss_pm_domain);
1272 break;
1273 case BUS_NOTIFY_DRIVER_NOT_BOUND:
1274 case BUS_NOTIFY_UNBOUND_DRIVER:
1275 dev_pm_domain_set(&pdev->dev, NULL);
1276 break;
1277 case BUS_NOTIFY_ADD_DEVICE:
1278 dev_pm_domain_set(&pdev->dev, &acpi_lpss_pm_domain);
1279 if (pdata->dev_desc->flags & LPSS_LTR)
1280 return sysfs_create_group(&pdev->dev.kobj,
1281 &lpss_attr_group);
1282 break;
1283 case BUS_NOTIFY_DEL_DEVICE:
1284 if (pdata->dev_desc->flags & LPSS_LTR)
1285 sysfs_remove_group(&pdev->dev.kobj, &lpss_attr_group);
1286 dev_pm_domain_set(&pdev->dev, NULL);
1287 break;
1288 default:
1289 break;
1290 }
1291
1292 return 0;
1293}
1294
1295static struct notifier_block acpi_lpss_nb = {
1296 .notifier_call = acpi_lpss_platform_notify,
1297};
1298
1299static void acpi_lpss_bind(struct device *dev)
1300{
1301 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1302
1303 if (!pdata || !pdata->mmio_base || !(pdata->dev_desc->flags & LPSS_LTR))
1304 return;
1305
1306 if (pdata->mmio_size >= pdata->dev_desc->prv_offset + LPSS_LTR_SIZE)
1307 dev->power.set_latency_tolerance = acpi_lpss_set_ltr;
1308 else
1309 dev_err(dev, "MMIO size insufficient to access LTR\n");
1310}
1311
1312static void acpi_lpss_unbind(struct device *dev)
1313{
1314 dev->power.set_latency_tolerance = NULL;
1315}
1316
1317static struct acpi_scan_handler lpss_handler = {
1318 .ids = acpi_lpss_device_ids,
1319 .attach = acpi_lpss_create_device,
1320 .bind = acpi_lpss_bind,
1321 .unbind = acpi_lpss_unbind,
1322};
1323
1324void __init acpi_lpss_init(void)
1325{
1326 const struct x86_cpu_id *id;
1327 int ret;
1328
1329 ret = lpt_clk_init();
1330 if (ret)
1331 return;
1332
1333 id = x86_match_cpu(lpss_cpu_ids);
1334 if (id)
1335 lpss_quirks |= LPSS_QUIRK_ALWAYS_POWER_ON;
1336
1337 bus_register_notifier(&platform_bus_type, &acpi_lpss_nb);
1338 acpi_scan_add_handler(&lpss_handler);
1339}
1340
1341#else
1342
1343static struct acpi_scan_handler lpss_handler = {
1344 .ids = acpi_lpss_device_ids,
1345};
1346
1347void __init acpi_lpss_init(void)
1348{
1349 acpi_scan_add_handler(&lpss_handler);
1350}
1351
1352#endif
1353