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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
26ACPI_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
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
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
64struct lpss_private_data;
65
66struct lpss_device_desc {
67 unsigned int flags;
68 unsigned int prv_offset;
69 size_t prv_size_override;
70 void (*setup)(struct lpss_private_data *pdata);
71};
72
73static struct lpss_device_desc lpss_dma_desc = {
74 .flags = LPSS_CLK,
75};
76
77struct lpss_private_data {
78 void __iomem *mmio_base;
79 resource_size_t mmio_size;
80 unsigned int fixed_clk_rate;
81 struct clk *clk;
82 const struct lpss_device_desc *dev_desc;
83 u32 prv_reg_ctx[LPSS_PRV_REG_COUNT];
84};
85
86
87#define LPSS_UART_CPR 0xF4
88#define LPSS_UART_CPR_AFCE BIT(4)
89
90static void lpss_uart_setup(struct lpss_private_data *pdata)
91{
92 unsigned int offset;
93 u32 val;
94
95 offset = pdata->dev_desc->prv_offset + LPSS_TX_INT;
96 val = readl(pdata->mmio_base + offset);
97 writel(val | LPSS_TX_INT_MASK, pdata->mmio_base + offset);
98
99 val = readl(pdata->mmio_base + LPSS_UART_CPR);
100 if (!(val & LPSS_UART_CPR_AFCE)) {
101 offset = pdata->dev_desc->prv_offset + LPSS_GENERAL;
102 val = readl(pdata->mmio_base + offset);
103 val |= LPSS_GENERAL_UART_RTS_OVRD;
104 writel(val, pdata->mmio_base + offset);
105 }
106}
107
108static void byt_i2c_setup(struct lpss_private_data *pdata)
109{
110 unsigned int offset;
111 u32 val;
112
113 offset = pdata->dev_desc->prv_offset + LPSS_RESETS;
114 val = readl(pdata->mmio_base + offset);
115 val |= LPSS_RESETS_RESET_APB | LPSS_RESETS_RESET_FUNC;
116 writel(val, pdata->mmio_base + offset);
117
118 if (readl(pdata->mmio_base + pdata->dev_desc->prv_offset))
119 pdata->fixed_clk_rate = 133000000;
120}
121
122static struct lpss_device_desc lpt_dev_desc = {
123 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_LTR,
124 .prv_offset = 0x800,
125};
126
127static struct lpss_device_desc lpt_i2c_dev_desc = {
128 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_LTR,
129 .prv_offset = 0x800,
130};
131
132static struct lpss_device_desc lpt_uart_dev_desc = {
133 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_LTR,
134 .prv_offset = 0x800,
135 .setup = lpss_uart_setup,
136};
137
138static struct lpss_device_desc lpt_sdio_dev_desc = {
139 .flags = LPSS_LTR,
140 .prv_offset = 0x1000,
141 .prv_size_override = 0x1018,
142};
143
144static struct lpss_device_desc byt_pwm_dev_desc = {
145 .flags = LPSS_SAVE_CTX,
146};
147
148static struct lpss_device_desc byt_uart_dev_desc = {
149 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX,
150 .prv_offset = 0x800,
151 .setup = lpss_uart_setup,
152};
153
154static struct lpss_device_desc byt_spi_dev_desc = {
155 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX,
156 .prv_offset = 0x400,
157};
158
159static struct lpss_device_desc byt_sdio_dev_desc = {
160 .flags = LPSS_CLK,
161};
162
163static struct lpss_device_desc byt_i2c_dev_desc = {
164 .flags = LPSS_CLK | LPSS_SAVE_CTX,
165 .prv_offset = 0x800,
166 .setup = byt_i2c_setup,
167};
168
169#else
170
171#define LPSS_ADDR(desc) (0UL)
172
173#endif
174
175static const struct acpi_device_id acpi_lpss_device_ids[] = {
176
177 { "INTL9C60", LPSS_ADDR(lpss_dma_desc) },
178
179
180 { "INT33C0", LPSS_ADDR(lpt_dev_desc) },
181 { "INT33C1", LPSS_ADDR(lpt_dev_desc) },
182 { "INT33C2", LPSS_ADDR(lpt_i2c_dev_desc) },
183 { "INT33C3", LPSS_ADDR(lpt_i2c_dev_desc) },
184 { "INT33C4", LPSS_ADDR(lpt_uart_dev_desc) },
185 { "INT33C5", LPSS_ADDR(lpt_uart_dev_desc) },
186 { "INT33C6", LPSS_ADDR(lpt_sdio_dev_desc) },
187 { "INT33C7", },
188
189
190 { "80860F09", LPSS_ADDR(byt_pwm_dev_desc) },
191 { "80860F0A", LPSS_ADDR(byt_uart_dev_desc) },
192 { "80860F0E", LPSS_ADDR(byt_spi_dev_desc) },
193 { "80860F14", LPSS_ADDR(byt_sdio_dev_desc) },
194 { "80860F41", LPSS_ADDR(byt_i2c_dev_desc) },
195 { "INT33B2", },
196 { "INT33FC", },
197
198
199 { "80862288", LPSS_ADDR(byt_pwm_dev_desc) },
200 { "8086228A", LPSS_ADDR(byt_uart_dev_desc) },
201 { "8086228E", LPSS_ADDR(byt_spi_dev_desc) },
202 { "808622C1", LPSS_ADDR(byt_i2c_dev_desc) },
203
204 { "INT3430", LPSS_ADDR(lpt_dev_desc) },
205 { "INT3431", LPSS_ADDR(lpt_dev_desc) },
206 { "INT3432", LPSS_ADDR(lpt_i2c_dev_desc) },
207 { "INT3433", LPSS_ADDR(lpt_i2c_dev_desc) },
208 { "INT3434", LPSS_ADDR(lpt_uart_dev_desc) },
209 { "INT3435", LPSS_ADDR(lpt_uart_dev_desc) },
210 { "INT3436", LPSS_ADDR(lpt_sdio_dev_desc) },
211 { "INT3437", },
212
213
214 { "INT3438", LPSS_ADDR(lpt_dev_desc) },
215
216 { }
217};
218
219#ifdef CONFIG_X86_INTEL_LPSS
220
221static int is_memory(struct acpi_resource *res, void *not_used)
222{
223 struct resource r;
224 return !acpi_dev_resource_memory(res, &r);
225}
226
227
228static struct platform_device *lpss_clk_dev;
229
230static inline void lpt_register_clock_device(void)
231{
232 lpss_clk_dev = platform_device_register_simple("clk-lpt", -1, NULL, 0);
233}
234
235static int register_device_clock(struct acpi_device *adev,
236 struct lpss_private_data *pdata)
237{
238 const struct lpss_device_desc *dev_desc = pdata->dev_desc;
239 const char *devname = dev_name(&adev->dev);
240 struct clk *clk = ERR_PTR(-ENODEV);
241 struct lpss_clk_data *clk_data;
242 const char *parent, *clk_name;
243 void __iomem *prv_base;
244
245 if (!lpss_clk_dev)
246 lpt_register_clock_device();
247
248 clk_data = platform_get_drvdata(lpss_clk_dev);
249 if (!clk_data)
250 return -ENODEV;
251 clk = clk_data->clk;
252
253 if (!pdata->mmio_base
254 || pdata->mmio_size < dev_desc->prv_offset + LPSS_CLK_SIZE)
255 return -ENODATA;
256
257 parent = clk_data->name;
258 prv_base = pdata->mmio_base + dev_desc->prv_offset;
259
260 if (pdata->fixed_clk_rate) {
261 clk = clk_register_fixed_rate(NULL, devname, parent, 0,
262 pdata->fixed_clk_rate);
263 goto out;
264 }
265
266 if (dev_desc->flags & LPSS_CLK_GATE) {
267 clk = clk_register_gate(NULL, devname, parent, 0,
268 prv_base, 0, 0, NULL);
269 parent = devname;
270 }
271
272 if (dev_desc->flags & LPSS_CLK_DIVIDER) {
273
274 if (!readl(prv_base))
275 writel(LPSS_CLK_DIVIDER_DEF_MASK, prv_base);
276
277 clk_name = kasprintf(GFP_KERNEL, "%s-div", devname);
278 if (!clk_name)
279 return -ENOMEM;
280 clk = clk_register_fractional_divider(NULL, clk_name, parent,
281 0, prv_base,
282 1, 15, 16, 15, 0, NULL);
283 parent = clk_name;
284
285 clk_name = kasprintf(GFP_KERNEL, "%s-update", devname);
286 if (!clk_name) {
287 kfree(parent);
288 return -ENOMEM;
289 }
290 clk = clk_register_gate(NULL, clk_name, parent,
291 CLK_SET_RATE_PARENT | CLK_SET_RATE_GATE,
292 prv_base, 31, 0, NULL);
293 kfree(parent);
294 kfree(clk_name);
295 }
296out:
297 if (IS_ERR(clk))
298 return PTR_ERR(clk);
299
300 pdata->clk = clk;
301 clk_register_clkdev(clk, NULL, devname);
302 return 0;
303}
304
305static int acpi_lpss_create_device(struct acpi_device *adev,
306 const struct acpi_device_id *id)
307{
308 struct lpss_device_desc *dev_desc;
309 struct lpss_private_data *pdata;
310 struct resource_list_entry *rentry;
311 struct list_head resource_list;
312 struct platform_device *pdev;
313 int ret;
314
315 dev_desc = (struct lpss_device_desc *)id->driver_data;
316 if (!dev_desc) {
317 pdev = acpi_create_platform_device(adev);
318 return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
319 }
320 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
321 if (!pdata)
322 return -ENOMEM;
323
324 INIT_LIST_HEAD(&resource_list);
325 ret = acpi_dev_get_resources(adev, &resource_list, is_memory, NULL);
326 if (ret < 0)
327 goto err_out;
328
329 list_for_each_entry(rentry, &resource_list, node)
330 if (resource_type(&rentry->res) == IORESOURCE_MEM) {
331 if (dev_desc->prv_size_override)
332 pdata->mmio_size = dev_desc->prv_size_override;
333 else
334 pdata->mmio_size = resource_size(&rentry->res);
335 pdata->mmio_base = ioremap(rentry->res.start,
336 pdata->mmio_size);
337 break;
338 }
339
340 acpi_dev_free_resource_list(&resource_list);
341
342 pdata->dev_desc = dev_desc;
343
344 if (dev_desc->setup)
345 dev_desc->setup(pdata);
346
347 if (dev_desc->flags & LPSS_CLK) {
348 ret = register_device_clock(adev, pdata);
349 if (ret) {
350
351 ret = 0;
352 goto err_out;
353 }
354 }
355
356
357
358
359
360
361 ret = acpi_device_fix_up_power(adev);
362 if (ret) {
363
364 ret = 0;
365 goto err_out;
366 }
367
368 adev->driver_data = pdata;
369 pdev = acpi_create_platform_device(adev);
370 if (!IS_ERR_OR_NULL(pdev)) {
371 return 1;
372 }
373
374 ret = PTR_ERR(pdev);
375 adev->driver_data = NULL;
376
377 err_out:
378 kfree(pdata);
379 return ret;
380}
381
382static u32 __lpss_reg_read(struct lpss_private_data *pdata, unsigned int reg)
383{
384 return readl(pdata->mmio_base + pdata->dev_desc->prv_offset + reg);
385}
386
387static void __lpss_reg_write(u32 val, struct lpss_private_data *pdata,
388 unsigned int reg)
389{
390 writel(val, pdata->mmio_base + pdata->dev_desc->prv_offset + reg);
391}
392
393static int lpss_reg_read(struct device *dev, unsigned int reg, u32 *val)
394{
395 struct acpi_device *adev;
396 struct lpss_private_data *pdata;
397 unsigned long flags;
398 int ret;
399
400 ret = acpi_bus_get_device(ACPI_HANDLE(dev), &adev);
401 if (WARN_ON(ret))
402 return ret;
403
404 spin_lock_irqsave(&dev->power.lock, flags);
405 if (pm_runtime_suspended(dev)) {
406 ret = -EAGAIN;
407 goto out;
408 }
409 pdata = acpi_driver_data(adev);
410 if (WARN_ON(!pdata || !pdata->mmio_base)) {
411 ret = -ENODEV;
412 goto out;
413 }
414 *val = __lpss_reg_read(pdata, reg);
415
416 out:
417 spin_unlock_irqrestore(&dev->power.lock, flags);
418 return ret;
419}
420
421static ssize_t lpss_ltr_show(struct device *dev, struct device_attribute *attr,
422 char *buf)
423{
424 u32 ltr_value = 0;
425 unsigned int reg;
426 int ret;
427
428 reg = strcmp(attr->attr.name, "auto_ltr") ? LPSS_SW_LTR : LPSS_AUTO_LTR;
429 ret = lpss_reg_read(dev, reg, <r_value);
430 if (ret)
431 return ret;
432
433 return snprintf(buf, PAGE_SIZE, "%08x\n", ltr_value);
434}
435
436static ssize_t lpss_ltr_mode_show(struct device *dev,
437 struct device_attribute *attr, char *buf)
438{
439 u32 ltr_mode = 0;
440 char *outstr;
441 int ret;
442
443 ret = lpss_reg_read(dev, LPSS_GENERAL, <r_mode);
444 if (ret)
445 return ret;
446
447 outstr = (ltr_mode & LPSS_GENERAL_LTR_MODE_SW) ? "sw" : "auto";
448 return sprintf(buf, "%s\n", outstr);
449}
450
451static DEVICE_ATTR(auto_ltr, S_IRUSR, lpss_ltr_show, NULL);
452static DEVICE_ATTR(sw_ltr, S_IRUSR, lpss_ltr_show, NULL);
453static DEVICE_ATTR(ltr_mode, S_IRUSR, lpss_ltr_mode_show, NULL);
454
455static struct attribute *lpss_attrs[] = {
456 &dev_attr_auto_ltr.attr,
457 &dev_attr_sw_ltr.attr,
458 &dev_attr_ltr_mode.attr,
459 NULL,
460};
461
462static struct attribute_group lpss_attr_group = {
463 .attrs = lpss_attrs,
464 .name = "lpss_ltr",
465};
466
467static void acpi_lpss_set_ltr(struct device *dev, s32 val)
468{
469 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
470 u32 ltr_mode, ltr_val;
471
472 ltr_mode = __lpss_reg_read(pdata, LPSS_GENERAL);
473 if (val < 0) {
474 if (ltr_mode & LPSS_GENERAL_LTR_MODE_SW) {
475 ltr_mode &= ~LPSS_GENERAL_LTR_MODE_SW;
476 __lpss_reg_write(ltr_mode, pdata, LPSS_GENERAL);
477 }
478 return;
479 }
480 ltr_val = __lpss_reg_read(pdata, LPSS_SW_LTR) & ~LPSS_LTR_SNOOP_MASK;
481 if (val >= LPSS_LTR_SNOOP_LAT_CUTOFF) {
482 ltr_val |= LPSS_LTR_SNOOP_LAT_32US;
483 val = LPSS_LTR_MAX_VAL;
484 } else if (val > LPSS_LTR_MAX_VAL) {
485 ltr_val |= LPSS_LTR_SNOOP_LAT_32US | LPSS_LTR_SNOOP_REQ;
486 val >>= LPSS_LTR_SNOOP_LAT_SHIFT;
487 } else {
488 ltr_val |= LPSS_LTR_SNOOP_LAT_1US | LPSS_LTR_SNOOP_REQ;
489 }
490 ltr_val |= val;
491 __lpss_reg_write(ltr_val, pdata, LPSS_SW_LTR);
492 if (!(ltr_mode & LPSS_GENERAL_LTR_MODE_SW)) {
493 ltr_mode |= LPSS_GENERAL_LTR_MODE_SW;
494 __lpss_reg_write(ltr_mode, pdata, LPSS_GENERAL);
495 }
496}
497
498#ifdef CONFIG_PM
499
500
501
502
503
504
505
506
507
508static void acpi_lpss_save_ctx(struct device *dev,
509 struct lpss_private_data *pdata)
510{
511 unsigned int i;
512
513 for (i = 0; i < LPSS_PRV_REG_COUNT; i++) {
514 unsigned long offset = i * sizeof(u32);
515
516 pdata->prv_reg_ctx[i] = __lpss_reg_read(pdata, offset);
517 dev_dbg(dev, "saving 0x%08x from LPSS reg at offset 0x%02lx\n",
518 pdata->prv_reg_ctx[i], offset);
519 }
520}
521
522
523
524
525
526
527
528
529static void acpi_lpss_restore_ctx(struct device *dev,
530 struct lpss_private_data *pdata)
531{
532 unsigned int i;
533
534
535
536
537
538
539
540 msleep(10);
541
542 for (i = 0; i < LPSS_PRV_REG_COUNT; i++) {
543 unsigned long offset = i * sizeof(u32);
544
545 __lpss_reg_write(pdata->prv_reg_ctx[i], pdata, offset);
546 dev_dbg(dev, "restoring 0x%08x to LPSS reg at offset 0x%02lx\n",
547 pdata->prv_reg_ctx[i], offset);
548 }
549}
550
551#ifdef CONFIG_PM_SLEEP
552static int acpi_lpss_suspend_late(struct device *dev)
553{
554 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
555 int ret;
556
557 ret = pm_generic_suspend_late(dev);
558 if (ret)
559 return ret;
560
561 if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
562 acpi_lpss_save_ctx(dev, pdata);
563
564 return acpi_dev_suspend_late(dev);
565}
566
567static int acpi_lpss_resume_early(struct device *dev)
568{
569 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
570 int ret;
571
572 ret = acpi_dev_resume_early(dev);
573 if (ret)
574 return ret;
575
576 if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
577 acpi_lpss_restore_ctx(dev, pdata);
578
579 return pm_generic_resume_early(dev);
580}
581#endif
582
583static int acpi_lpss_runtime_suspend(struct device *dev)
584{
585 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
586 int ret;
587
588 ret = pm_generic_runtime_suspend(dev);
589 if (ret)
590 return ret;
591
592 if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
593 acpi_lpss_save_ctx(dev, pdata);
594
595 return acpi_dev_runtime_suspend(dev);
596}
597
598static int acpi_lpss_runtime_resume(struct device *dev)
599{
600 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
601 int ret;
602
603 ret = acpi_dev_runtime_resume(dev);
604 if (ret)
605 return ret;
606
607 if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
608 acpi_lpss_restore_ctx(dev, pdata);
609
610 return pm_generic_runtime_resume(dev);
611}
612#endif
613
614static struct dev_pm_domain acpi_lpss_pm_domain = {
615 .ops = {
616#ifdef CONFIG_PM
617#ifdef CONFIG_PM_SLEEP
618 .prepare = acpi_subsys_prepare,
619 .complete = acpi_subsys_complete,
620 .suspend = acpi_subsys_suspend,
621 .suspend_late = acpi_lpss_suspend_late,
622 .resume_early = acpi_lpss_resume_early,
623 .freeze = acpi_subsys_freeze,
624 .poweroff = acpi_subsys_suspend,
625 .poweroff_late = acpi_lpss_suspend_late,
626 .restore_early = acpi_lpss_resume_early,
627#endif
628 .runtime_suspend = acpi_lpss_runtime_suspend,
629 .runtime_resume = acpi_lpss_runtime_resume,
630#endif
631 },
632};
633
634static int acpi_lpss_platform_notify(struct notifier_block *nb,
635 unsigned long action, void *data)
636{
637 struct platform_device *pdev = to_platform_device(data);
638 struct lpss_private_data *pdata;
639 struct acpi_device *adev;
640 const struct acpi_device_id *id;
641
642 id = acpi_match_device(acpi_lpss_device_ids, &pdev->dev);
643 if (!id || !id->driver_data)
644 return 0;
645
646 if (acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev))
647 return 0;
648
649 pdata = acpi_driver_data(adev);
650 if (!pdata)
651 return 0;
652
653 if (pdata->mmio_base &&
654 pdata->mmio_size < pdata->dev_desc->prv_offset + LPSS_LTR_SIZE) {
655 dev_err(&pdev->dev, "MMIO size insufficient to access LTR\n");
656 return 0;
657 }
658
659 switch (action) {
660 case BUS_NOTIFY_ADD_DEVICE:
661 pdev->dev.pm_domain = &acpi_lpss_pm_domain;
662 if (pdata->dev_desc->flags & LPSS_LTR)
663 return sysfs_create_group(&pdev->dev.kobj,
664 &lpss_attr_group);
665 break;
666 case BUS_NOTIFY_DEL_DEVICE:
667 if (pdata->dev_desc->flags & LPSS_LTR)
668 sysfs_remove_group(&pdev->dev.kobj, &lpss_attr_group);
669 pdev->dev.pm_domain = NULL;
670 break;
671 default:
672 break;
673 }
674
675 return 0;
676}
677
678static struct notifier_block acpi_lpss_nb = {
679 .notifier_call = acpi_lpss_platform_notify,
680};
681
682static void acpi_lpss_bind(struct device *dev)
683{
684 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
685
686 if (!pdata || !pdata->mmio_base || !(pdata->dev_desc->flags & LPSS_LTR))
687 return;
688
689 if (pdata->mmio_size >= pdata->dev_desc->prv_offset + LPSS_LTR_SIZE)
690 dev->power.set_latency_tolerance = acpi_lpss_set_ltr;
691 else
692 dev_err(dev, "MMIO size insufficient to access LTR\n");
693}
694
695static void acpi_lpss_unbind(struct device *dev)
696{
697 dev->power.set_latency_tolerance = NULL;
698}
699
700static struct acpi_scan_handler lpss_handler = {
701 .ids = acpi_lpss_device_ids,
702 .attach = acpi_lpss_create_device,
703 .bind = acpi_lpss_bind,
704 .unbind = acpi_lpss_unbind,
705};
706
707void __init acpi_lpss_init(void)
708{
709 if (!lpt_clk_init()) {
710 bus_register_notifier(&platform_bus_type, &acpi_lpss_nb);
711 acpi_scan_add_handler(&lpss_handler);
712 }
713}
714
715#else
716
717static struct acpi_scan_handler lpss_handler = {
718 .ids = acpi_lpss_device_ids,
719};
720
721void __init acpi_lpss_init(void)
722{
723 acpi_scan_add_handler(&lpss_handler);
724}
725
726#endif
727
