2 * ACPI support for Intel Lynxpoint LPSS.
4 * Copyright (C) 2013, Intel Corporation
5 * Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
6 * Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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.
13 #include <linux/acpi.h>
14 #include <linux/clkdev.h>
15 #include <linux/clk-provider.h>
16 #include <linux/err.h>
18 #include <linux/mutex.h>
19 #include <linux/platform_device.h>
20 #include <linux/platform_data/clk-lpss.h>
21 #include <linux/platform_data/x86/pmc_atom.h>
22 #include <linux/pm_domain.h>
23 #include <linux/pm_runtime.h>
24 #include <linux/pwm.h>
25 #include <linux/delay.h>
29 ACPI_MODULE_NAME("acpi_lpss");
31 #ifdef CONFIG_X86_INTEL_LPSS
33 #include <asm/cpu_device_id.h>
34 #include <asm/intel-family.h>
35 #include <asm/iosf_mbi.h>
37 #define LPSS_ADDR(desc) ((unsigned long)&desc)
39 #define LPSS_CLK_SIZE 0x04
40 #define LPSS_LTR_SIZE 0x18
42 /* Offsets relative to LPSS_PRIVATE_OFFSET */
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)
62 #define LPSS_PRV_REG_COUNT 9
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)
72 struct lpss_private_data
;
74 struct lpss_device_desc
{
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
);
83 static const struct lpss_device_desc lpss_dma_desc
= {
87 struct lpss_private_data
{
88 struct acpi_device
*adev
;
89 void __iomem
*mmio_base
;
90 resource_size_t mmio_size
;
91 unsigned int fixed_clk_rate
;
93 const struct lpss_device_desc
*dev_desc
;
94 u32 prv_reg_ctx
[LPSS_PRV_REG_COUNT
];
97 /* LPSS run time quirks */
98 static unsigned int lpss_quirks
;
101 * LPSS_QUIRK_ALWAYS_POWER_ON: override power state for LPSS DMA device.
103 * The LPSS DMA controller has neither _PS0 nor _PS3 method. Moreover
104 * it can be powered off automatically whenever the last LPSS device goes down.
105 * In case of no power any access to the DMA controller will hang the system.
106 * The behaviour is reproduced on some HP laptops based on Intel BayTrail as
107 * well as on ASuS T100TA transformer.
109 * This quirk overrides power state of entire LPSS island to keep DMA powered
110 * on whenever we have at least one other device in use.
112 #define LPSS_QUIRK_ALWAYS_POWER_ON BIT(0)
114 /* UART Component Parameter Register */
115 #define LPSS_UART_CPR 0xF4
116 #define LPSS_UART_CPR_AFCE BIT(4)
118 static void lpss_uart_setup(struct lpss_private_data
*pdata
)
123 offset
= pdata
->dev_desc
->prv_offset
+ LPSS_TX_INT
;
124 val
= readl(pdata
->mmio_base
+ offset
);
125 writel(val
| LPSS_TX_INT_MASK
, pdata
->mmio_base
+ offset
);
127 val
= readl(pdata
->mmio_base
+ LPSS_UART_CPR
);
128 if (!(val
& LPSS_UART_CPR_AFCE
)) {
129 offset
= pdata
->dev_desc
->prv_offset
+ LPSS_GENERAL
;
130 val
= readl(pdata
->mmio_base
+ offset
);
131 val
|= LPSS_GENERAL_UART_RTS_OVRD
;
132 writel(val
, pdata
->mmio_base
+ offset
);
136 static void lpss_deassert_reset(struct lpss_private_data
*pdata
)
141 offset
= pdata
->dev_desc
->prv_offset
+ LPSS_RESETS
;
142 val
= readl(pdata
->mmio_base
+ offset
);
143 val
|= LPSS_RESETS_RESET_APB
| LPSS_RESETS_RESET_FUNC
;
144 writel(val
, pdata
->mmio_base
+ offset
);
148 * BYT PWM used for backlight control by the i915 driver on systems without
149 * the Crystal Cove PMIC.
151 static struct pwm_lookup byt_pwm_lookup
[] = {
152 PWM_LOOKUP_WITH_MODULE("80860F09:00", 0, "0000:00:02.0",
153 "pwm_backlight", 0, PWM_POLARITY_NORMAL
,
154 "pwm-lpss-platform"),
157 static void byt_pwm_setup(struct lpss_private_data
*pdata
)
159 struct acpi_device
*adev
= pdata
->adev
;
161 /* Only call pwm_add_table for the first PWM controller */
162 if (!adev
->pnp
.unique_id
|| strcmp(adev
->pnp
.unique_id
, "1"))
165 if (!acpi_dev_present("INT33FD", NULL
, -1))
166 pwm_add_table(byt_pwm_lookup
, ARRAY_SIZE(byt_pwm_lookup
));
169 #define LPSS_I2C_ENABLE 0x6c
171 static void byt_i2c_setup(struct lpss_private_data
*pdata
)
173 lpss_deassert_reset(pdata
);
175 if (readl(pdata
->mmio_base
+ pdata
->dev_desc
->prv_offset
))
176 pdata
->fixed_clk_rate
= 133000000;
178 writel(0, pdata
->mmio_base
+ LPSS_I2C_ENABLE
);
181 /* BSW PWM used for backlight control by the i915 driver */
182 static struct pwm_lookup bsw_pwm_lookup
[] = {
183 PWM_LOOKUP_WITH_MODULE("80862288:00", 0, "0000:00:02.0",
184 "pwm_backlight", 0, PWM_POLARITY_NORMAL
,
185 "pwm-lpss-platform"),
188 static void bsw_pwm_setup(struct lpss_private_data
*pdata
)
190 struct acpi_device
*adev
= pdata
->adev
;
192 /* Only call pwm_add_table for the first PWM controller */
193 if (!adev
->pnp
.unique_id
|| strcmp(adev
->pnp
.unique_id
, "1"))
196 pwm_add_table(bsw_pwm_lookup
, ARRAY_SIZE(bsw_pwm_lookup
));
199 static const struct lpss_device_desc lpt_dev_desc
= {
200 .flags
= LPSS_CLK
| LPSS_CLK_GATE
| LPSS_CLK_DIVIDER
| LPSS_LTR
,
204 static const struct lpss_device_desc lpt_i2c_dev_desc
= {
205 .flags
= LPSS_CLK
| LPSS_CLK_GATE
| LPSS_LTR
,
209 static struct property_entry uart_properties
[] = {
210 PROPERTY_ENTRY_U32("reg-io-width", 4),
211 PROPERTY_ENTRY_U32("reg-shift", 2),
212 PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
216 static const struct lpss_device_desc lpt_uart_dev_desc
= {
217 .flags
= LPSS_CLK
| LPSS_CLK_GATE
| LPSS_CLK_DIVIDER
| LPSS_LTR
,
218 .clk_con_id
= "baudclk",
220 .setup
= lpss_uart_setup
,
221 .properties
= uart_properties
,
224 static const struct lpss_device_desc lpt_sdio_dev_desc
= {
226 .prv_offset
= 0x1000,
227 .prv_size_override
= 0x1018,
230 static const struct lpss_device_desc byt_pwm_dev_desc
= {
231 .flags
= LPSS_SAVE_CTX
,
232 .setup
= byt_pwm_setup
,
235 static const struct lpss_device_desc bsw_pwm_dev_desc
= {
236 .flags
= LPSS_SAVE_CTX
| LPSS_NO_D3_DELAY
,
237 .setup
= bsw_pwm_setup
,
240 static const struct lpss_device_desc byt_uart_dev_desc
= {
241 .flags
= LPSS_CLK
| LPSS_CLK_GATE
| LPSS_CLK_DIVIDER
| LPSS_SAVE_CTX
,
242 .clk_con_id
= "baudclk",
244 .setup
= lpss_uart_setup
,
245 .properties
= uart_properties
,
248 static const struct lpss_device_desc bsw_uart_dev_desc
= {
249 .flags
= LPSS_CLK
| LPSS_CLK_GATE
| LPSS_CLK_DIVIDER
| LPSS_SAVE_CTX
251 .clk_con_id
= "baudclk",
253 .setup
= lpss_uart_setup
,
254 .properties
= uart_properties
,
257 static const struct lpss_device_desc byt_spi_dev_desc
= {
258 .flags
= LPSS_CLK
| LPSS_CLK_GATE
| LPSS_CLK_DIVIDER
| LPSS_SAVE_CTX
,
262 static const struct lpss_device_desc byt_sdio_dev_desc
= {
266 static const struct lpss_device_desc byt_i2c_dev_desc
= {
267 .flags
= LPSS_CLK
| LPSS_SAVE_CTX
,
269 .setup
= byt_i2c_setup
,
272 static const struct lpss_device_desc bsw_i2c_dev_desc
= {
273 .flags
= LPSS_CLK
| LPSS_SAVE_CTX
| LPSS_NO_D3_DELAY
,
275 .setup
= byt_i2c_setup
,
278 static const struct lpss_device_desc bsw_spi_dev_desc
= {
279 .flags
= LPSS_CLK
| LPSS_CLK_GATE
| LPSS_CLK_DIVIDER
| LPSS_SAVE_CTX
282 .setup
= lpss_deassert_reset
,
285 #define ICPU(model) { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, }
287 static const struct x86_cpu_id lpss_cpu_ids
[] = {
288 ICPU(INTEL_FAM6_ATOM_SILVERMONT1
), /* Valleyview, Bay Trail */
289 ICPU(INTEL_FAM6_ATOM_AIRMONT
), /* Braswell, Cherry Trail */
295 #define LPSS_ADDR(desc) (0UL)
297 #endif /* CONFIG_X86_INTEL_LPSS */
299 static const struct acpi_device_id acpi_lpss_device_ids
[] = {
300 /* Generic LPSS devices */
301 { "INTL9C60", LPSS_ADDR(lpss_dma_desc
) },
303 /* Lynxpoint LPSS devices */
304 { "INT33C0", LPSS_ADDR(lpt_dev_desc
) },
305 { "INT33C1", LPSS_ADDR(lpt_dev_desc
) },
306 { "INT33C2", LPSS_ADDR(lpt_i2c_dev_desc
) },
307 { "INT33C3", LPSS_ADDR(lpt_i2c_dev_desc
) },
308 { "INT33C4", LPSS_ADDR(lpt_uart_dev_desc
) },
309 { "INT33C5", LPSS_ADDR(lpt_uart_dev_desc
) },
310 { "INT33C6", LPSS_ADDR(lpt_sdio_dev_desc
) },
313 /* BayTrail LPSS devices */
314 { "80860F09", LPSS_ADDR(byt_pwm_dev_desc
) },
315 { "80860F0A", LPSS_ADDR(byt_uart_dev_desc
) },
316 { "80860F0E", LPSS_ADDR(byt_spi_dev_desc
) },
317 { "80860F14", LPSS_ADDR(byt_sdio_dev_desc
) },
318 { "80860F41", LPSS_ADDR(byt_i2c_dev_desc
) },
322 /* Braswell LPSS devices */
323 { "80862288", LPSS_ADDR(bsw_pwm_dev_desc
) },
324 { "8086228A", LPSS_ADDR(bsw_uart_dev_desc
) },
325 { "8086228E", LPSS_ADDR(bsw_spi_dev_desc
) },
326 { "808622C1", LPSS_ADDR(bsw_i2c_dev_desc
) },
328 /* Broadwell LPSS devices */
329 { "INT3430", LPSS_ADDR(lpt_dev_desc
) },
330 { "INT3431", LPSS_ADDR(lpt_dev_desc
) },
331 { "INT3432", LPSS_ADDR(lpt_i2c_dev_desc
) },
332 { "INT3433", LPSS_ADDR(lpt_i2c_dev_desc
) },
333 { "INT3434", LPSS_ADDR(lpt_uart_dev_desc
) },
334 { "INT3435", LPSS_ADDR(lpt_uart_dev_desc
) },
335 { "INT3436", LPSS_ADDR(lpt_sdio_dev_desc
) },
338 /* Wildcat Point LPSS devices */
339 { "INT3438", LPSS_ADDR(lpt_dev_desc
) },
344 #ifdef CONFIG_X86_INTEL_LPSS
346 static int is_memory(struct acpi_resource
*res
, void *not_used
)
349 return !acpi_dev_resource_memory(res
, &r
);
352 /* LPSS main clock device. */
353 static struct platform_device
*lpss_clk_dev
;
355 static inline void lpt_register_clock_device(void)
357 lpss_clk_dev
= platform_device_register_simple("clk-lpt", -1, NULL
, 0);
360 static int register_device_clock(struct acpi_device
*adev
,
361 struct lpss_private_data
*pdata
)
363 const struct lpss_device_desc
*dev_desc
= pdata
->dev_desc
;
364 const char *devname
= dev_name(&adev
->dev
);
365 struct clk
*clk
= ERR_PTR(-ENODEV
);
366 struct lpss_clk_data
*clk_data
;
367 const char *parent
, *clk_name
;
368 void __iomem
*prv_base
;
371 lpt_register_clock_device();
373 clk_data
= platform_get_drvdata(lpss_clk_dev
);
378 if (!pdata
->mmio_base
379 || pdata
->mmio_size
< dev_desc
->prv_offset
+ LPSS_CLK_SIZE
)
382 parent
= clk_data
->name
;
383 prv_base
= pdata
->mmio_base
+ dev_desc
->prv_offset
;
385 if (pdata
->fixed_clk_rate
) {
386 clk
= clk_register_fixed_rate(NULL
, devname
, parent
, 0,
387 pdata
->fixed_clk_rate
);
391 if (dev_desc
->flags
& LPSS_CLK_GATE
) {
392 clk
= clk_register_gate(NULL
, devname
, parent
, 0,
393 prv_base
, 0, 0, NULL
);
397 if (dev_desc
->flags
& LPSS_CLK_DIVIDER
) {
398 /* Prevent division by zero */
399 if (!readl(prv_base
))
400 writel(LPSS_CLK_DIVIDER_DEF_MASK
, prv_base
);
402 clk_name
= kasprintf(GFP_KERNEL
, "%s-div", devname
);
405 clk
= clk_register_fractional_divider(NULL
, clk_name
, parent
,
407 1, 15, 16, 15, 0, NULL
);
410 clk_name
= kasprintf(GFP_KERNEL
, "%s-update", devname
);
415 clk
= clk_register_gate(NULL
, clk_name
, parent
,
416 CLK_SET_RATE_PARENT
| CLK_SET_RATE_GATE
,
417 prv_base
, 31, 0, NULL
);
426 clk_register_clkdev(clk
, dev_desc
->clk_con_id
, devname
);
430 static int acpi_lpss_create_device(struct acpi_device
*adev
,
431 const struct acpi_device_id
*id
)
433 const struct lpss_device_desc
*dev_desc
;
434 struct lpss_private_data
*pdata
;
435 struct resource_entry
*rentry
;
436 struct list_head resource_list
;
437 struct platform_device
*pdev
;
440 dev_desc
= (const struct lpss_device_desc
*)id
->driver_data
;
442 pdev
= acpi_create_platform_device(adev
, NULL
);
443 return IS_ERR_OR_NULL(pdev
) ? PTR_ERR(pdev
) : 1;
445 pdata
= kzalloc(sizeof(*pdata
), GFP_KERNEL
);
449 INIT_LIST_HEAD(&resource_list
);
450 ret
= acpi_dev_get_resources(adev
, &resource_list
, is_memory
, NULL
);
454 list_for_each_entry(rentry
, &resource_list
, node
)
455 if (resource_type(rentry
->res
) == IORESOURCE_MEM
) {
456 if (dev_desc
->prv_size_override
)
457 pdata
->mmio_size
= dev_desc
->prv_size_override
;
459 pdata
->mmio_size
= resource_size(rentry
->res
);
460 pdata
->mmio_base
= ioremap(rentry
->res
->start
,
465 acpi_dev_free_resource_list(&resource_list
);
467 if (!pdata
->mmio_base
) {
473 pdata
->dev_desc
= dev_desc
;
476 dev_desc
->setup(pdata
);
478 if (dev_desc
->flags
& LPSS_CLK
) {
479 ret
= register_device_clock(adev
, pdata
);
481 /* Skip the device, but continue the namespace scan. */
488 * This works around a known issue in ACPI tables where LPSS devices
489 * have _PS0 and _PS3 without _PSC (and no power resources), so
490 * acpi_bus_init_power() will assume that the BIOS has put them into D0.
492 ret
= acpi_device_fix_up_power(adev
);
494 /* Skip the device, but continue the namespace scan. */
499 adev
->driver_data
= pdata
;
500 pdev
= acpi_create_platform_device(adev
, dev_desc
->properties
);
501 if (!IS_ERR_OR_NULL(pdev
)) {
506 adev
->driver_data
= NULL
;
513 static u32
__lpss_reg_read(struct lpss_private_data
*pdata
, unsigned int reg
)
515 return readl(pdata
->mmio_base
+ pdata
->dev_desc
->prv_offset
+ reg
);
518 static void __lpss_reg_write(u32 val
, struct lpss_private_data
*pdata
,
521 writel(val
, pdata
->mmio_base
+ pdata
->dev_desc
->prv_offset
+ reg
);
524 static int lpss_reg_read(struct device
*dev
, unsigned int reg
, u32
*val
)
526 struct acpi_device
*adev
;
527 struct lpss_private_data
*pdata
;
531 ret
= acpi_bus_get_device(ACPI_HANDLE(dev
), &adev
);
535 spin_lock_irqsave(&dev
->power
.lock
, flags
);
536 if (pm_runtime_suspended(dev
)) {
540 pdata
= acpi_driver_data(adev
);
541 if (WARN_ON(!pdata
|| !pdata
->mmio_base
)) {
545 *val
= __lpss_reg_read(pdata
, reg
);
548 spin_unlock_irqrestore(&dev
->power
.lock
, flags
);
552 static ssize_t
lpss_ltr_show(struct device
*dev
, struct device_attribute
*attr
,
559 reg
= strcmp(attr
->attr
.name
, "auto_ltr") ? LPSS_SW_LTR
: LPSS_AUTO_LTR
;
560 ret
= lpss_reg_read(dev
, reg
, <r_value
);
564 return snprintf(buf
, PAGE_SIZE
, "%08x\n", ltr_value
);
567 static ssize_t
lpss_ltr_mode_show(struct device
*dev
,
568 struct device_attribute
*attr
, char *buf
)
574 ret
= lpss_reg_read(dev
, LPSS_GENERAL
, <r_mode
);
578 outstr
= (ltr_mode
& LPSS_GENERAL_LTR_MODE_SW
) ? "sw" : "auto";
579 return sprintf(buf
, "%s\n", outstr
);
582 static DEVICE_ATTR(auto_ltr
, S_IRUSR
, lpss_ltr_show
, NULL
);
583 static DEVICE_ATTR(sw_ltr
, S_IRUSR
, lpss_ltr_show
, NULL
);
584 static DEVICE_ATTR(ltr_mode
, S_IRUSR
, lpss_ltr_mode_show
, NULL
);
586 static struct attribute
*lpss_attrs
[] = {
587 &dev_attr_auto_ltr
.attr
,
588 &dev_attr_sw_ltr
.attr
,
589 &dev_attr_ltr_mode
.attr
,
593 static const struct attribute_group lpss_attr_group
= {
598 static void acpi_lpss_set_ltr(struct device
*dev
, s32 val
)
600 struct lpss_private_data
*pdata
= acpi_driver_data(ACPI_COMPANION(dev
));
601 u32 ltr_mode
, ltr_val
;
603 ltr_mode
= __lpss_reg_read(pdata
, LPSS_GENERAL
);
605 if (ltr_mode
& LPSS_GENERAL_LTR_MODE_SW
) {
606 ltr_mode
&= ~LPSS_GENERAL_LTR_MODE_SW
;
607 __lpss_reg_write(ltr_mode
, pdata
, LPSS_GENERAL
);
611 ltr_val
= __lpss_reg_read(pdata
, LPSS_SW_LTR
) & ~LPSS_LTR_SNOOP_MASK
;
612 if (val
>= LPSS_LTR_SNOOP_LAT_CUTOFF
) {
613 ltr_val
|= LPSS_LTR_SNOOP_LAT_32US
;
614 val
= LPSS_LTR_MAX_VAL
;
615 } else if (val
> LPSS_LTR_MAX_VAL
) {
616 ltr_val
|= LPSS_LTR_SNOOP_LAT_32US
| LPSS_LTR_SNOOP_REQ
;
617 val
>>= LPSS_LTR_SNOOP_LAT_SHIFT
;
619 ltr_val
|= LPSS_LTR_SNOOP_LAT_1US
| LPSS_LTR_SNOOP_REQ
;
622 __lpss_reg_write(ltr_val
, pdata
, LPSS_SW_LTR
);
623 if (!(ltr_mode
& LPSS_GENERAL_LTR_MODE_SW
)) {
624 ltr_mode
|= LPSS_GENERAL_LTR_MODE_SW
;
625 __lpss_reg_write(ltr_mode
, pdata
, LPSS_GENERAL
);
631 * acpi_lpss_save_ctx() - Save the private registers of LPSS device
633 * @pdata: pointer to the private data of the LPSS device
635 * Most LPSS devices have private registers which may loose their context when
636 * the device is powered down. acpi_lpss_save_ctx() saves those registers into
639 static void acpi_lpss_save_ctx(struct device
*dev
,
640 struct lpss_private_data
*pdata
)
644 for (i
= 0; i
< LPSS_PRV_REG_COUNT
; i
++) {
645 unsigned long offset
= i
* sizeof(u32
);
647 pdata
->prv_reg_ctx
[i
] = __lpss_reg_read(pdata
, offset
);
648 dev_dbg(dev
, "saving 0x%08x from LPSS reg at offset 0x%02lx\n",
649 pdata
->prv_reg_ctx
[i
], offset
);
654 * acpi_lpss_restore_ctx() - Restore the private registers of LPSS device
656 * @pdata: pointer to the private data of the LPSS device
658 * Restores the registers that were previously stored with acpi_lpss_save_ctx().
660 static void acpi_lpss_restore_ctx(struct device
*dev
,
661 struct lpss_private_data
*pdata
)
665 for (i
= 0; i
< LPSS_PRV_REG_COUNT
; i
++) {
666 unsigned long offset
= i
* sizeof(u32
);
668 __lpss_reg_write(pdata
->prv_reg_ctx
[i
], pdata
, offset
);
669 dev_dbg(dev
, "restoring 0x%08x to LPSS reg at offset 0x%02lx\n",
670 pdata
->prv_reg_ctx
[i
], offset
);
674 static void acpi_lpss_d3_to_d0_delay(struct lpss_private_data
*pdata
)
677 * The following delay is needed or the subsequent write operations may
678 * fail. The LPSS devices are actually PCI devices and the PCI spec
679 * expects 10ms delay before the device can be accessed after D3 to D0
680 * transition. However some platforms like BSW does not need this delay.
682 unsigned int delay
= 10; /* default 10ms delay */
684 if (pdata
->dev_desc
->flags
& LPSS_NO_D3_DELAY
)
690 static int acpi_lpss_activate(struct device
*dev
)
692 struct lpss_private_data
*pdata
= acpi_driver_data(ACPI_COMPANION(dev
));
695 ret
= acpi_dev_runtime_resume(dev
);
699 acpi_lpss_d3_to_d0_delay(pdata
);
702 * This is called only on ->probe() stage where a device is either in
703 * known state defined by BIOS or most likely powered off. Due to this
704 * we have to deassert reset line to be sure that ->probe() will
705 * recognize the device.
707 if (pdata
->dev_desc
->flags
& LPSS_SAVE_CTX
)
708 lpss_deassert_reset(pdata
);
713 static void acpi_lpss_dismiss(struct device
*dev
)
715 acpi_dev_runtime_suspend(dev
);
718 #ifdef CONFIG_PM_SLEEP
719 static int acpi_lpss_suspend_late(struct device
*dev
)
721 struct lpss_private_data
*pdata
= acpi_driver_data(ACPI_COMPANION(dev
));
724 ret
= pm_generic_suspend_late(dev
);
728 if (pdata
->dev_desc
->flags
& LPSS_SAVE_CTX
)
729 acpi_lpss_save_ctx(dev
, pdata
);
731 return acpi_dev_suspend_late(dev
);
734 static int acpi_lpss_resume_early(struct device
*dev
)
736 struct lpss_private_data
*pdata
= acpi_driver_data(ACPI_COMPANION(dev
));
739 ret
= acpi_dev_resume_early(dev
);
743 acpi_lpss_d3_to_d0_delay(pdata
);
745 if (pdata
->dev_desc
->flags
& LPSS_SAVE_CTX
)
746 acpi_lpss_restore_ctx(dev
, pdata
);
748 return pm_generic_resume_early(dev
);
750 #endif /* CONFIG_PM_SLEEP */
752 /* IOSF SB for LPSS island */
753 #define LPSS_IOSF_UNIT_LPIOEP 0xA0
754 #define LPSS_IOSF_UNIT_LPIO1 0xAB
755 #define LPSS_IOSF_UNIT_LPIO2 0xAC
757 #define LPSS_IOSF_PMCSR 0x84
758 #define LPSS_PMCSR_D0 0
759 #define LPSS_PMCSR_D3hot 3
760 #define LPSS_PMCSR_Dx_MASK GENMASK(1, 0)
762 #define LPSS_IOSF_GPIODEF0 0x154
763 #define LPSS_GPIODEF0_DMA1_D3 BIT(2)
764 #define LPSS_GPIODEF0_DMA2_D3 BIT(3)
765 #define LPSS_GPIODEF0_DMA_D3_MASK GENMASK(3, 2)
766 #define LPSS_GPIODEF0_DMA_LLP BIT(13)
768 static DEFINE_MUTEX(lpss_iosf_mutex
);
770 static void lpss_iosf_enter_d3_state(void)
773 u32 mask1
= LPSS_GPIODEF0_DMA_D3_MASK
| LPSS_GPIODEF0_DMA_LLP
;
774 u32 value2
= LPSS_PMCSR_D3hot
;
775 u32 mask2
= LPSS_PMCSR_Dx_MASK
;
777 * PMC provides an information about actual status of the LPSS devices.
778 * Here we read the values related to LPSS power island, i.e. LPSS
779 * devices, excluding both LPSS DMA controllers, along with SCC domain.
781 u32 func_dis
, d3_sts_0
, pmc_status
, pmc_mask
= 0xfe000ffe;
784 ret
= pmc_atom_read(PMC_FUNC_DIS
, &func_dis
);
788 mutex_lock(&lpss_iosf_mutex
);
790 ret
= pmc_atom_read(PMC_D3_STS_0
, &d3_sts_0
);
795 * Get the status of entire LPSS power island per device basis.
796 * Shutdown both LPSS DMA controllers if and only if all other devices
797 * are already in D3hot.
799 pmc_status
= (~(d3_sts_0
| func_dis
)) & pmc_mask
;
803 iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO1
, MBI_CFG_WRITE
,
804 LPSS_IOSF_PMCSR
, value2
, mask2
);
806 iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO2
, MBI_CFG_WRITE
,
807 LPSS_IOSF_PMCSR
, value2
, mask2
);
809 iosf_mbi_modify(LPSS_IOSF_UNIT_LPIOEP
, MBI_CR_WRITE
,
810 LPSS_IOSF_GPIODEF0
, value1
, mask1
);
812 mutex_unlock(&lpss_iosf_mutex
);
815 static void lpss_iosf_exit_d3_state(void)
817 u32 value1
= LPSS_GPIODEF0_DMA1_D3
| LPSS_GPIODEF0_DMA2_D3
|
818 LPSS_GPIODEF0_DMA_LLP
;
819 u32 mask1
= LPSS_GPIODEF0_DMA_D3_MASK
| LPSS_GPIODEF0_DMA_LLP
;
820 u32 value2
= LPSS_PMCSR_D0
;
821 u32 mask2
= LPSS_PMCSR_Dx_MASK
;
823 mutex_lock(&lpss_iosf_mutex
);
825 iosf_mbi_modify(LPSS_IOSF_UNIT_LPIOEP
, MBI_CR_WRITE
,
826 LPSS_IOSF_GPIODEF0
, value1
, mask1
);
828 iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO2
, MBI_CFG_WRITE
,
829 LPSS_IOSF_PMCSR
, value2
, mask2
);
831 iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO1
, MBI_CFG_WRITE
,
832 LPSS_IOSF_PMCSR
, value2
, mask2
);
834 mutex_unlock(&lpss_iosf_mutex
);
837 static int acpi_lpss_runtime_suspend(struct device
*dev
)
839 struct lpss_private_data
*pdata
= acpi_driver_data(ACPI_COMPANION(dev
));
842 ret
= pm_generic_runtime_suspend(dev
);
846 if (pdata
->dev_desc
->flags
& LPSS_SAVE_CTX
)
847 acpi_lpss_save_ctx(dev
, pdata
);
849 ret
= acpi_dev_runtime_suspend(dev
);
852 * This call must be last in the sequence, otherwise PMC will return
853 * wrong status for devices being about to be powered off. See
854 * lpss_iosf_enter_d3_state() for further information.
856 if (lpss_quirks
& LPSS_QUIRK_ALWAYS_POWER_ON
&& iosf_mbi_available())
857 lpss_iosf_enter_d3_state();
862 static int acpi_lpss_runtime_resume(struct device
*dev
)
864 struct lpss_private_data
*pdata
= acpi_driver_data(ACPI_COMPANION(dev
));
868 * This call is kept first to be in symmetry with
869 * acpi_lpss_runtime_suspend() one.
871 if (lpss_quirks
& LPSS_QUIRK_ALWAYS_POWER_ON
&& iosf_mbi_available())
872 lpss_iosf_exit_d3_state();
874 ret
= acpi_dev_runtime_resume(dev
);
878 acpi_lpss_d3_to_d0_delay(pdata
);
880 if (pdata
->dev_desc
->flags
& LPSS_SAVE_CTX
)
881 acpi_lpss_restore_ctx(dev
, pdata
);
883 return pm_generic_runtime_resume(dev
);
885 #endif /* CONFIG_PM */
887 static struct dev_pm_domain acpi_lpss_pm_domain
= {
889 .activate
= acpi_lpss_activate
,
890 .dismiss
= acpi_lpss_dismiss
,
894 #ifdef CONFIG_PM_SLEEP
895 .prepare
= acpi_subsys_prepare
,
896 .complete
= pm_complete_with_resume_check
,
897 .suspend
= acpi_subsys_suspend
,
898 .suspend_late
= acpi_lpss_suspend_late
,
899 .resume_early
= acpi_lpss_resume_early
,
900 .freeze
= acpi_subsys_freeze
,
901 .poweroff
= acpi_subsys_suspend
,
902 .poweroff_late
= acpi_lpss_suspend_late
,
903 .restore_early
= acpi_lpss_resume_early
,
905 .runtime_suspend
= acpi_lpss_runtime_suspend
,
906 .runtime_resume
= acpi_lpss_runtime_resume
,
911 static int acpi_lpss_platform_notify(struct notifier_block
*nb
,
912 unsigned long action
, void *data
)
914 struct platform_device
*pdev
= to_platform_device(data
);
915 struct lpss_private_data
*pdata
;
916 struct acpi_device
*adev
;
917 const struct acpi_device_id
*id
;
919 id
= acpi_match_device(acpi_lpss_device_ids
, &pdev
->dev
);
920 if (!id
|| !id
->driver_data
)
923 if (acpi_bus_get_device(ACPI_HANDLE(&pdev
->dev
), &adev
))
926 pdata
= acpi_driver_data(adev
);
930 if (pdata
->mmio_base
&&
931 pdata
->mmio_size
< pdata
->dev_desc
->prv_offset
+ LPSS_LTR_SIZE
) {
932 dev_err(&pdev
->dev
, "MMIO size insufficient to access LTR\n");
937 case BUS_NOTIFY_BIND_DRIVER
:
938 dev_pm_domain_set(&pdev
->dev
, &acpi_lpss_pm_domain
);
940 case BUS_NOTIFY_DRIVER_NOT_BOUND
:
941 case BUS_NOTIFY_UNBOUND_DRIVER
:
942 dev_pm_domain_set(&pdev
->dev
, NULL
);
944 case BUS_NOTIFY_ADD_DEVICE
:
945 dev_pm_domain_set(&pdev
->dev
, &acpi_lpss_pm_domain
);
946 if (pdata
->dev_desc
->flags
& LPSS_LTR
)
947 return sysfs_create_group(&pdev
->dev
.kobj
,
950 case BUS_NOTIFY_DEL_DEVICE
:
951 if (pdata
->dev_desc
->flags
& LPSS_LTR
)
952 sysfs_remove_group(&pdev
->dev
.kobj
, &lpss_attr_group
);
953 dev_pm_domain_set(&pdev
->dev
, NULL
);
962 static struct notifier_block acpi_lpss_nb
= {
963 .notifier_call
= acpi_lpss_platform_notify
,
966 static void acpi_lpss_bind(struct device
*dev
)
968 struct lpss_private_data
*pdata
= acpi_driver_data(ACPI_COMPANION(dev
));
970 if (!pdata
|| !pdata
->mmio_base
|| !(pdata
->dev_desc
->flags
& LPSS_LTR
))
973 if (pdata
->mmio_size
>= pdata
->dev_desc
->prv_offset
+ LPSS_LTR_SIZE
)
974 dev
->power
.set_latency_tolerance
= acpi_lpss_set_ltr
;
976 dev_err(dev
, "MMIO size insufficient to access LTR\n");
979 static void acpi_lpss_unbind(struct device
*dev
)
981 dev
->power
.set_latency_tolerance
= NULL
;
984 static struct acpi_scan_handler lpss_handler
= {
985 .ids
= acpi_lpss_device_ids
,
986 .attach
= acpi_lpss_create_device
,
987 .bind
= acpi_lpss_bind
,
988 .unbind
= acpi_lpss_unbind
,
991 void __init
acpi_lpss_init(void)
993 const struct x86_cpu_id
*id
;
996 ret
= lpt_clk_init();
1000 id
= x86_match_cpu(lpss_cpu_ids
);
1002 lpss_quirks
|= LPSS_QUIRK_ALWAYS_POWER_ON
;
1004 bus_register_notifier(&platform_bus_type
, &acpi_lpss_nb
);
1005 acpi_scan_add_handler(&lpss_handler
);
1010 static struct acpi_scan_handler lpss_handler
= {
1011 .ids
= acpi_lpss_device_ids
,
1014 void __init
acpi_lpss_init(void)
1016 acpi_scan_add_handler(&lpss_handler
);
1019 #endif /* CONFIG_X86_INTEL_LPSS */