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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
[deliverable/linux.git] / drivers / acpi / acpi_lpss.c
1 /*
2 * ACPI support for Intel Lynxpoint LPSS.
3 *
4 * Copyright (C) 2013, Intel Corporation
5 * Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
6 * Rafael J. Wysocki <rafael.j.wysocki@intel.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 #include <linux/acpi.h>
14 #include <linux/clk.h>
15 #include <linux/clkdev.h>
16 #include <linux/clk-provider.h>
17 #include <linux/err.h>
18 #include <linux/io.h>
19 #include <linux/platform_device.h>
20 #include <linux/platform_data/clk-lpss.h>
21 #include <linux/pm_runtime.h>
22 #include <linux/delay.h>
23
24 #include "internal.h"
25
26 ACPI_MODULE_NAME("acpi_lpss");
27
28 #ifdef CONFIG_X86_INTEL_LPSS
29
30 #define LPSS_ADDR(desc) ((unsigned long)&desc)
31
32 #define LPSS_CLK_SIZE 0x04
33 #define LPSS_LTR_SIZE 0x18
34
35 /* Offsets relative to LPSS_PRIVATE_OFFSET */
36 #define LPSS_CLK_DIVIDER_DEF_MASK (BIT(1) | BIT(16))
37 #define LPSS_RESETS 0x04
38 #define LPSS_RESETS_RESET_FUNC BIT(0)
39 #define LPSS_RESETS_RESET_APB BIT(1)
40 #define LPSS_GENERAL 0x08
41 #define LPSS_GENERAL_LTR_MODE_SW BIT(2)
42 #define LPSS_GENERAL_UART_RTS_OVRD BIT(3)
43 #define LPSS_SW_LTR 0x10
44 #define LPSS_AUTO_LTR 0x14
45 #define LPSS_LTR_SNOOP_REQ BIT(15)
46 #define LPSS_LTR_SNOOP_MASK 0x0000FFFF
47 #define LPSS_LTR_SNOOP_LAT_1US 0x800
48 #define LPSS_LTR_SNOOP_LAT_32US 0xC00
49 #define LPSS_LTR_SNOOP_LAT_SHIFT 5
50 #define LPSS_LTR_SNOOP_LAT_CUTOFF 3000
51 #define LPSS_LTR_MAX_VAL 0x3FF
52 #define LPSS_TX_INT 0x20
53 #define LPSS_TX_INT_MASK BIT(1)
54
55 #define LPSS_PRV_REG_COUNT 9
56
57 /* LPSS Flags */
58 #define LPSS_CLK BIT(0)
59 #define LPSS_CLK_GATE BIT(1)
60 #define LPSS_CLK_DIVIDER BIT(2)
61 #define LPSS_LTR BIT(3)
62 #define LPSS_SAVE_CTX BIT(4)
63
64 struct lpss_private_data;
65
66 struct lpss_device_desc {
67 unsigned int flags;
68 const char *clk_con_id;
69 unsigned int prv_offset;
70 size_t prv_size_override;
71 void (*setup)(struct lpss_private_data *pdata);
72 };
73
74 static struct lpss_device_desc lpss_dma_desc = {
75 .flags = LPSS_CLK,
76 };
77
78 struct lpss_private_data {
79 void __iomem *mmio_base;
80 resource_size_t mmio_size;
81 unsigned int fixed_clk_rate;
82 struct clk *clk;
83 const struct lpss_device_desc *dev_desc;
84 u32 prv_reg_ctx[LPSS_PRV_REG_COUNT];
85 };
86
87 /* UART Component Parameter Register */
88 #define LPSS_UART_CPR 0xF4
89 #define LPSS_UART_CPR_AFCE BIT(4)
90
91 static void lpss_uart_setup(struct lpss_private_data *pdata)
92 {
93 unsigned int offset;
94 u32 val;
95
96 offset = pdata->dev_desc->prv_offset + LPSS_TX_INT;
97 val = readl(pdata->mmio_base + offset);
98 writel(val | LPSS_TX_INT_MASK, pdata->mmio_base + offset);
99
100 val = readl(pdata->mmio_base + LPSS_UART_CPR);
101 if (!(val & LPSS_UART_CPR_AFCE)) {
102 offset = pdata->dev_desc->prv_offset + LPSS_GENERAL;
103 val = readl(pdata->mmio_base + offset);
104 val |= LPSS_GENERAL_UART_RTS_OVRD;
105 writel(val, pdata->mmio_base + offset);
106 }
107 }
108
109 static void lpss_deassert_reset(struct lpss_private_data *pdata)
110 {
111 unsigned int offset;
112 u32 val;
113
114 offset = pdata->dev_desc->prv_offset + LPSS_RESETS;
115 val = readl(pdata->mmio_base + offset);
116 val |= LPSS_RESETS_RESET_APB | LPSS_RESETS_RESET_FUNC;
117 writel(val, pdata->mmio_base + offset);
118 }
119
120 #define LPSS_I2C_ENABLE 0x6c
121
122 static void byt_i2c_setup(struct lpss_private_data *pdata)
123 {
124 lpss_deassert_reset(pdata);
125
126 if (readl(pdata->mmio_base + pdata->dev_desc->prv_offset))
127 pdata->fixed_clk_rate = 133000000;
128
129 writel(0, pdata->mmio_base + LPSS_I2C_ENABLE);
130 }
131
132 static struct lpss_device_desc lpt_dev_desc = {
133 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_LTR,
134 .prv_offset = 0x800,
135 };
136
137 static struct lpss_device_desc lpt_i2c_dev_desc = {
138 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_LTR,
139 .prv_offset = 0x800,
140 };
141
142 static struct lpss_device_desc lpt_uart_dev_desc = {
143 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_LTR,
144 .clk_con_id = "baudclk",
145 .prv_offset = 0x800,
146 .setup = lpss_uart_setup,
147 };
148
149 static struct lpss_device_desc lpt_sdio_dev_desc = {
150 .flags = LPSS_LTR,
151 .prv_offset = 0x1000,
152 .prv_size_override = 0x1018,
153 };
154
155 static struct lpss_device_desc byt_pwm_dev_desc = {
156 .flags = LPSS_SAVE_CTX,
157 };
158
159 static struct lpss_device_desc byt_uart_dev_desc = {
160 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX,
161 .clk_con_id = "baudclk",
162 .prv_offset = 0x800,
163 .setup = lpss_uart_setup,
164 };
165
166 static struct lpss_device_desc byt_spi_dev_desc = {
167 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX,
168 .prv_offset = 0x400,
169 };
170
171 static struct lpss_device_desc byt_sdio_dev_desc = {
172 .flags = LPSS_CLK,
173 };
174
175 static struct lpss_device_desc byt_i2c_dev_desc = {
176 .flags = LPSS_CLK | LPSS_SAVE_CTX,
177 .prv_offset = 0x800,
178 .setup = byt_i2c_setup,
179 };
180
181 static struct lpss_device_desc bsw_spi_dev_desc = {
182 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX,
183 .prv_offset = 0x400,
184 .setup = lpss_deassert_reset,
185 };
186
187 #else
188
189 #define LPSS_ADDR(desc) (0UL)
190
191 #endif /* CONFIG_X86_INTEL_LPSS */
192
193 static const struct acpi_device_id acpi_lpss_device_ids[] = {
194 /* Generic LPSS devices */
195 { "INTL9C60", LPSS_ADDR(lpss_dma_desc) },
196
197 /* Lynxpoint LPSS devices */
198 { "INT33C0", LPSS_ADDR(lpt_dev_desc) },
199 { "INT33C1", LPSS_ADDR(lpt_dev_desc) },
200 { "INT33C2", LPSS_ADDR(lpt_i2c_dev_desc) },
201 { "INT33C3", LPSS_ADDR(lpt_i2c_dev_desc) },
202 { "INT33C4", LPSS_ADDR(lpt_uart_dev_desc) },
203 { "INT33C5", LPSS_ADDR(lpt_uart_dev_desc) },
204 { "INT33C6", LPSS_ADDR(lpt_sdio_dev_desc) },
205 { "INT33C7", },
206
207 /* BayTrail LPSS devices */
208 { "80860F09", LPSS_ADDR(byt_pwm_dev_desc) },
209 { "80860F0A", LPSS_ADDR(byt_uart_dev_desc) },
210 { "80860F0E", LPSS_ADDR(byt_spi_dev_desc) },
211 { "80860F14", LPSS_ADDR(byt_sdio_dev_desc) },
212 { "80860F41", LPSS_ADDR(byt_i2c_dev_desc) },
213 { "INT33B2", },
214 { "INT33FC", },
215
216 /* Braswell LPSS devices */
217 { "80862288", LPSS_ADDR(byt_pwm_dev_desc) },
218 { "8086228A", LPSS_ADDR(byt_uart_dev_desc) },
219 { "8086228E", LPSS_ADDR(bsw_spi_dev_desc) },
220 { "808622C1", LPSS_ADDR(byt_i2c_dev_desc) },
221
222 { "INT3430", LPSS_ADDR(lpt_dev_desc) },
223 { "INT3431", LPSS_ADDR(lpt_dev_desc) },
224 { "INT3432", LPSS_ADDR(lpt_i2c_dev_desc) },
225 { "INT3433", LPSS_ADDR(lpt_i2c_dev_desc) },
226 { "INT3434", LPSS_ADDR(lpt_uart_dev_desc) },
227 { "INT3435", LPSS_ADDR(lpt_uart_dev_desc) },
228 { "INT3436", LPSS_ADDR(lpt_sdio_dev_desc) },
229 { "INT3437", },
230
231 /* Wildcat Point LPSS devices */
232 { "INT3438", LPSS_ADDR(lpt_dev_desc) },
233
234 { }
235 };
236
237 #ifdef CONFIG_X86_INTEL_LPSS
238
239 static int is_memory(struct acpi_resource *res, void *not_used)
240 {
241 struct resource r;
242 return !acpi_dev_resource_memory(res, &r);
243 }
244
245 /* LPSS main clock device. */
246 static struct platform_device *lpss_clk_dev;
247
248 static inline void lpt_register_clock_device(void)
249 {
250 lpss_clk_dev = platform_device_register_simple("clk-lpt", -1, NULL, 0);
251 }
252
253 static int register_device_clock(struct acpi_device *adev,
254 struct lpss_private_data *pdata)
255 {
256 const struct lpss_device_desc *dev_desc = pdata->dev_desc;
257 const char *devname = dev_name(&adev->dev);
258 struct clk *clk = ERR_PTR(-ENODEV);
259 struct lpss_clk_data *clk_data;
260 const char *parent, *clk_name;
261 void __iomem *prv_base;
262
263 if (!lpss_clk_dev)
264 lpt_register_clock_device();
265
266 clk_data = platform_get_drvdata(lpss_clk_dev);
267 if (!clk_data)
268 return -ENODEV;
269 clk = clk_data->clk;
270
271 if (!pdata->mmio_base
272 || pdata->mmio_size < dev_desc->prv_offset + LPSS_CLK_SIZE)
273 return -ENODATA;
274
275 parent = clk_data->name;
276 prv_base = pdata->mmio_base + dev_desc->prv_offset;
277
278 if (pdata->fixed_clk_rate) {
279 clk = clk_register_fixed_rate(NULL, devname, parent, 0,
280 pdata->fixed_clk_rate);
281 goto out;
282 }
283
284 if (dev_desc->flags & LPSS_CLK_GATE) {
285 clk = clk_register_gate(NULL, devname, parent, 0,
286 prv_base, 0, 0, NULL);
287 parent = devname;
288 }
289
290 if (dev_desc->flags & LPSS_CLK_DIVIDER) {
291 /* Prevent division by zero */
292 if (!readl(prv_base))
293 writel(LPSS_CLK_DIVIDER_DEF_MASK, prv_base);
294
295 clk_name = kasprintf(GFP_KERNEL, "%s-div", devname);
296 if (!clk_name)
297 return -ENOMEM;
298 clk = clk_register_fractional_divider(NULL, clk_name, parent,
299 0, prv_base,
300 1, 15, 16, 15, 0, NULL);
301 parent = clk_name;
302
303 clk_name = kasprintf(GFP_KERNEL, "%s-update", devname);
304 if (!clk_name) {
305 kfree(parent);
306 return -ENOMEM;
307 }
308 clk = clk_register_gate(NULL, clk_name, parent,
309 CLK_SET_RATE_PARENT | CLK_SET_RATE_GATE,
310 prv_base, 31, 0, NULL);
311 kfree(parent);
312 kfree(clk_name);
313 }
314 out:
315 if (IS_ERR(clk))
316 return PTR_ERR(clk);
317
318 pdata->clk = clk;
319 clk_register_clkdev(clk, dev_desc->clk_con_id, devname);
320 return 0;
321 }
322
323 static int acpi_lpss_create_device(struct acpi_device *adev,
324 const struct acpi_device_id *id)
325 {
326 struct lpss_device_desc *dev_desc;
327 struct lpss_private_data *pdata;
328 struct resource_entry *rentry;
329 struct list_head resource_list;
330 struct platform_device *pdev;
331 int ret;
332
333 dev_desc = (struct lpss_device_desc *)id->driver_data;
334 if (!dev_desc) {
335 pdev = acpi_create_platform_device(adev);
336 return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
337 }
338 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
339 if (!pdata)
340 return -ENOMEM;
341
342 INIT_LIST_HEAD(&resource_list);
343 ret = acpi_dev_get_resources(adev, &resource_list, is_memory, NULL);
344 if (ret < 0)
345 goto err_out;
346
347 list_for_each_entry(rentry, &resource_list, node)
348 if (resource_type(rentry->res) == IORESOURCE_MEM) {
349 if (dev_desc->prv_size_override)
350 pdata->mmio_size = dev_desc->prv_size_override;
351 else
352 pdata->mmio_size = resource_size(rentry->res);
353 pdata->mmio_base = ioremap(rentry->res->start,
354 pdata->mmio_size);
355 if (!pdata->mmio_base)
356 goto err_out;
357 break;
358 }
359
360 acpi_dev_free_resource_list(&resource_list);
361
362 pdata->dev_desc = dev_desc;
363
364 if (dev_desc->setup)
365 dev_desc->setup(pdata);
366
367 if (dev_desc->flags & LPSS_CLK) {
368 ret = register_device_clock(adev, pdata);
369 if (ret) {
370 /* Skip the device, but continue the namespace scan. */
371 ret = 0;
372 goto err_out;
373 }
374 }
375
376 /*
377 * This works around a known issue in ACPI tables where LPSS devices
378 * have _PS0 and _PS3 without _PSC (and no power resources), so
379 * acpi_bus_init_power() will assume that the BIOS has put them into D0.
380 */
381 ret = acpi_device_fix_up_power(adev);
382 if (ret) {
383 /* Skip the device, but continue the namespace scan. */
384 ret = 0;
385 goto err_out;
386 }
387
388 adev->driver_data = pdata;
389 pdev = acpi_create_platform_device(adev);
390 if (!IS_ERR_OR_NULL(pdev)) {
391 return 1;
392 }
393
394 ret = PTR_ERR(pdev);
395 adev->driver_data = NULL;
396
397 err_out:
398 kfree(pdata);
399 return ret;
400 }
401
402 static u32 __lpss_reg_read(struct lpss_private_data *pdata, unsigned int reg)
403 {
404 return readl(pdata->mmio_base + pdata->dev_desc->prv_offset + reg);
405 }
406
407 static void __lpss_reg_write(u32 val, struct lpss_private_data *pdata,
408 unsigned int reg)
409 {
410 writel(val, pdata->mmio_base + pdata->dev_desc->prv_offset + reg);
411 }
412
413 static int lpss_reg_read(struct device *dev, unsigned int reg, u32 *val)
414 {
415 struct acpi_device *adev;
416 struct lpss_private_data *pdata;
417 unsigned long flags;
418 int ret;
419
420 ret = acpi_bus_get_device(ACPI_HANDLE(dev), &adev);
421 if (WARN_ON(ret))
422 return ret;
423
424 spin_lock_irqsave(&dev->power.lock, flags);
425 if (pm_runtime_suspended(dev)) {
426 ret = -EAGAIN;
427 goto out;
428 }
429 pdata = acpi_driver_data(adev);
430 if (WARN_ON(!pdata || !pdata->mmio_base)) {
431 ret = -ENODEV;
432 goto out;
433 }
434 *val = __lpss_reg_read(pdata, reg);
435
436 out:
437 spin_unlock_irqrestore(&dev->power.lock, flags);
438 return ret;
439 }
440
441 static ssize_t lpss_ltr_show(struct device *dev, struct device_attribute *attr,
442 char *buf)
443 {
444 u32 ltr_value = 0;
445 unsigned int reg;
446 int ret;
447
448 reg = strcmp(attr->attr.name, "auto_ltr") ? LPSS_SW_LTR : LPSS_AUTO_LTR;
449 ret = lpss_reg_read(dev, reg, &ltr_value);
450 if (ret)
451 return ret;
452
453 return snprintf(buf, PAGE_SIZE, "%08x\n", ltr_value);
454 }
455
456 static ssize_t lpss_ltr_mode_show(struct device *dev,
457 struct device_attribute *attr, char *buf)
458 {
459 u32 ltr_mode = 0;
460 char *outstr;
461 int ret;
462
463 ret = lpss_reg_read(dev, LPSS_GENERAL, &ltr_mode);
464 if (ret)
465 return ret;
466
467 outstr = (ltr_mode & LPSS_GENERAL_LTR_MODE_SW) ? "sw" : "auto";
468 return sprintf(buf, "%s\n", outstr);
469 }
470
471 static DEVICE_ATTR(auto_ltr, S_IRUSR, lpss_ltr_show, NULL);
472 static DEVICE_ATTR(sw_ltr, S_IRUSR, lpss_ltr_show, NULL);
473 static DEVICE_ATTR(ltr_mode, S_IRUSR, lpss_ltr_mode_show, NULL);
474
475 static struct attribute *lpss_attrs[] = {
476 &dev_attr_auto_ltr.attr,
477 &dev_attr_sw_ltr.attr,
478 &dev_attr_ltr_mode.attr,
479 NULL,
480 };
481
482 static struct attribute_group lpss_attr_group = {
483 .attrs = lpss_attrs,
484 .name = "lpss_ltr",
485 };
486
487 static void acpi_lpss_set_ltr(struct device *dev, s32 val)
488 {
489 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
490 u32 ltr_mode, ltr_val;
491
492 ltr_mode = __lpss_reg_read(pdata, LPSS_GENERAL);
493 if (val < 0) {
494 if (ltr_mode & LPSS_GENERAL_LTR_MODE_SW) {
495 ltr_mode &= ~LPSS_GENERAL_LTR_MODE_SW;
496 __lpss_reg_write(ltr_mode, pdata, LPSS_GENERAL);
497 }
498 return;
499 }
500 ltr_val = __lpss_reg_read(pdata, LPSS_SW_LTR) & ~LPSS_LTR_SNOOP_MASK;
501 if (val >= LPSS_LTR_SNOOP_LAT_CUTOFF) {
502 ltr_val |= LPSS_LTR_SNOOP_LAT_32US;
503 val = LPSS_LTR_MAX_VAL;
504 } else if (val > LPSS_LTR_MAX_VAL) {
505 ltr_val |= LPSS_LTR_SNOOP_LAT_32US | LPSS_LTR_SNOOP_REQ;
506 val >>= LPSS_LTR_SNOOP_LAT_SHIFT;
507 } else {
508 ltr_val |= LPSS_LTR_SNOOP_LAT_1US | LPSS_LTR_SNOOP_REQ;
509 }
510 ltr_val |= val;
511 __lpss_reg_write(ltr_val, pdata, LPSS_SW_LTR);
512 if (!(ltr_mode & LPSS_GENERAL_LTR_MODE_SW)) {
513 ltr_mode |= LPSS_GENERAL_LTR_MODE_SW;
514 __lpss_reg_write(ltr_mode, pdata, LPSS_GENERAL);
515 }
516 }
517
518 #ifdef CONFIG_PM
519 /**
520 * acpi_lpss_save_ctx() - Save the private registers of LPSS device
521 * @dev: LPSS device
522 * @pdata: pointer to the private data of the LPSS device
523 *
524 * Most LPSS devices have private registers which may loose their context when
525 * the device is powered down. acpi_lpss_save_ctx() saves those registers into
526 * prv_reg_ctx array.
527 */
528 static void acpi_lpss_save_ctx(struct device *dev,
529 struct lpss_private_data *pdata)
530 {
531 unsigned int i;
532
533 for (i = 0; i < LPSS_PRV_REG_COUNT; i++) {
534 unsigned long offset = i * sizeof(u32);
535
536 pdata->prv_reg_ctx[i] = __lpss_reg_read(pdata, offset);
537 dev_dbg(dev, "saving 0x%08x from LPSS reg at offset 0x%02lx\n",
538 pdata->prv_reg_ctx[i], offset);
539 }
540 }
541
542 /**
543 * acpi_lpss_restore_ctx() - Restore the private registers of LPSS device
544 * @dev: LPSS device
545 * @pdata: pointer to the private data of the LPSS device
546 *
547 * Restores the registers that were previously stored with acpi_lpss_save_ctx().
548 */
549 static void acpi_lpss_restore_ctx(struct device *dev,
550 struct lpss_private_data *pdata)
551 {
552 unsigned int i;
553
554 /*
555 * The following delay is needed or the subsequent write operations may
556 * fail. The LPSS devices are actually PCI devices and the PCI spec
557 * expects 10ms delay before the device can be accessed after D3 to D0
558 * transition.
559 */
560 msleep(10);
561
562 for (i = 0; i < LPSS_PRV_REG_COUNT; i++) {
563 unsigned long offset = i * sizeof(u32);
564
565 __lpss_reg_write(pdata->prv_reg_ctx[i], pdata, offset);
566 dev_dbg(dev, "restoring 0x%08x to LPSS reg at offset 0x%02lx\n",
567 pdata->prv_reg_ctx[i], offset);
568 }
569 }
570
571 #ifdef CONFIG_PM_SLEEP
572 static int acpi_lpss_suspend_late(struct device *dev)
573 {
574 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
575 int ret;
576
577 ret = pm_generic_suspend_late(dev);
578 if (ret)
579 return ret;
580
581 if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
582 acpi_lpss_save_ctx(dev, pdata);
583
584 return acpi_dev_suspend_late(dev);
585 }
586
587 static int acpi_lpss_resume_early(struct device *dev)
588 {
589 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
590 int ret;
591
592 ret = acpi_dev_resume_early(dev);
593 if (ret)
594 return ret;
595
596 if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
597 acpi_lpss_restore_ctx(dev, pdata);
598
599 return pm_generic_resume_early(dev);
600 }
601 #endif /* CONFIG_PM_SLEEP */
602
603 static int acpi_lpss_runtime_suspend(struct device *dev)
604 {
605 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
606 int ret;
607
608 ret = pm_generic_runtime_suspend(dev);
609 if (ret)
610 return ret;
611
612 if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
613 acpi_lpss_save_ctx(dev, pdata);
614
615 return acpi_dev_runtime_suspend(dev);
616 }
617
618 static int acpi_lpss_runtime_resume(struct device *dev)
619 {
620 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
621 int ret;
622
623 ret = acpi_dev_runtime_resume(dev);
624 if (ret)
625 return ret;
626
627 if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
628 acpi_lpss_restore_ctx(dev, pdata);
629
630 return pm_generic_runtime_resume(dev);
631 }
632 #endif /* CONFIG_PM */
633
634 static struct dev_pm_domain acpi_lpss_pm_domain = {
635 .ops = {
636 #ifdef CONFIG_PM
637 #ifdef CONFIG_PM_SLEEP
638 .prepare = acpi_subsys_prepare,
639 .complete = acpi_subsys_complete,
640 .suspend = acpi_subsys_suspend,
641 .suspend_late = acpi_lpss_suspend_late,
642 .resume_early = acpi_lpss_resume_early,
643 .freeze = acpi_subsys_freeze,
644 .poweroff = acpi_subsys_suspend,
645 .poweroff_late = acpi_lpss_suspend_late,
646 .restore_early = acpi_lpss_resume_early,
647 #endif
648 .runtime_suspend = acpi_lpss_runtime_suspend,
649 .runtime_resume = acpi_lpss_runtime_resume,
650 #endif
651 },
652 };
653
654 static int acpi_lpss_platform_notify(struct notifier_block *nb,
655 unsigned long action, void *data)
656 {
657 struct platform_device *pdev = to_platform_device(data);
658 struct lpss_private_data *pdata;
659 struct acpi_device *adev;
660 const struct acpi_device_id *id;
661
662 id = acpi_match_device(acpi_lpss_device_ids, &pdev->dev);
663 if (!id || !id->driver_data)
664 return 0;
665
666 if (acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev))
667 return 0;
668
669 pdata = acpi_driver_data(adev);
670 if (!pdata)
671 return 0;
672
673 if (pdata->mmio_base &&
674 pdata->mmio_size < pdata->dev_desc->prv_offset + LPSS_LTR_SIZE) {
675 dev_err(&pdev->dev, "MMIO size insufficient to access LTR\n");
676 return 0;
677 }
678
679 switch (action) {
680 case BUS_NOTIFY_ADD_DEVICE:
681 pdev->dev.pm_domain = &acpi_lpss_pm_domain;
682 if (pdata->dev_desc->flags & LPSS_LTR)
683 return sysfs_create_group(&pdev->dev.kobj,
684 &lpss_attr_group);
685 break;
686 case BUS_NOTIFY_DEL_DEVICE:
687 if (pdata->dev_desc->flags & LPSS_LTR)
688 sysfs_remove_group(&pdev->dev.kobj, &lpss_attr_group);
689 pdev->dev.pm_domain = NULL;
690 break;
691 default:
692 break;
693 }
694
695 return 0;
696 }
697
698 static struct notifier_block acpi_lpss_nb = {
699 .notifier_call = acpi_lpss_platform_notify,
700 };
701
702 static void acpi_lpss_bind(struct device *dev)
703 {
704 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
705
706 if (!pdata || !pdata->mmio_base || !(pdata->dev_desc->flags & LPSS_LTR))
707 return;
708
709 if (pdata->mmio_size >= pdata->dev_desc->prv_offset + LPSS_LTR_SIZE)
710 dev->power.set_latency_tolerance = acpi_lpss_set_ltr;
711 else
712 dev_err(dev, "MMIO size insufficient to access LTR\n");
713 }
714
715 static void acpi_lpss_unbind(struct device *dev)
716 {
717 dev->power.set_latency_tolerance = NULL;
718 }
719
720 static struct acpi_scan_handler lpss_handler = {
721 .ids = acpi_lpss_device_ids,
722 .attach = acpi_lpss_create_device,
723 .bind = acpi_lpss_bind,
724 .unbind = acpi_lpss_unbind,
725 };
726
727 void __init acpi_lpss_init(void)
728 {
729 if (!lpt_clk_init()) {
730 bus_register_notifier(&platform_bus_type, &acpi_lpss_nb);
731 acpi_scan_add_handler(&lpss_handler);
732 }
733 }
734
735 #else
736
737 static struct acpi_scan_handler lpss_handler = {
738 .ids = acpi_lpss_device_ids,
739 };
740
741 void __init acpi_lpss_init(void)
742 {
743 acpi_scan_add_handler(&lpss_handler);
744 }
745
746 #endif /* CONFIG_X86_INTEL_LPSS */
Linux kernel - Deliverables
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