Commit | Line | Data |
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c558e39e AS |
1 | /* |
2 | * Intel Low Power Subsystem PWM controller driver | |
3 | * | |
4 | * Copyright (C) 2014, Intel Corporation | |
5 | * | |
6 | * Derived from the original pwm-lpss.c | |
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/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/platform_device.h> | |
f080be27 | 17 | #include <linux/pm_runtime.h> |
c558e39e AS |
18 | |
19 | #include "pwm-lpss.h" | |
20 | ||
9900073c AS |
21 | /* BayTrail */ |
22 | static const struct pwm_lpss_boardinfo pwm_lpss_byt_info = { | |
23 | .clk_rate = 25000000, | |
24 | .npwm = 1, | |
25 | .base_unit_bits = 16, | |
26 | }; | |
27 | ||
28 | /* Braswell */ | |
29 | static const struct pwm_lpss_boardinfo pwm_lpss_bsw_info = { | |
30 | .clk_rate = 19200000, | |
31 | .npwm = 1, | |
32 | .base_unit_bits = 16, | |
4743765b | 33 | .other_devices_aml_touches_pwm_regs = true, |
9900073c AS |
34 | }; |
35 | ||
36 | /* Broxton */ | |
37 | static const struct pwm_lpss_boardinfo pwm_lpss_bxt_info = { | |
38 | .clk_rate = 19200000, | |
39 | .npwm = 4, | |
40 | .base_unit_bits = 22, | |
b997e3ed | 41 | .bypass = true, |
9900073c AS |
42 | }; |
43 | ||
c558e39e AS |
44 | static int pwm_lpss_probe_platform(struct platform_device *pdev) |
45 | { | |
46 | const struct pwm_lpss_boardinfo *info; | |
47 | const struct acpi_device_id *id; | |
48 | struct pwm_lpss_chip *lpwm; | |
49 | struct resource *r; | |
50 | ||
51 | id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev); | |
52 | if (!id) | |
53 | return -ENODEV; | |
54 | ||
55 | info = (const struct pwm_lpss_boardinfo *)id->driver_data; | |
56 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
57 | ||
58 | lpwm = pwm_lpss_probe(&pdev->dev, r, info); | |
59 | if (IS_ERR(lpwm)) | |
60 | return PTR_ERR(lpwm); | |
61 | ||
62 | platform_set_drvdata(pdev, lpwm); | |
f080be27 | 63 | |
4743765b | 64 | dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_SMART_PREPARE); |
f080be27 QZ |
65 | pm_runtime_set_active(&pdev->dev); |
66 | pm_runtime_enable(&pdev->dev); | |
67 | ||
c558e39e AS |
68 | return 0; |
69 | } | |
70 | ||
71 | static int pwm_lpss_remove_platform(struct platform_device *pdev) | |
72 | { | |
73 | struct pwm_lpss_chip *lpwm = platform_get_drvdata(pdev); | |
74 | ||
f080be27 | 75 | pm_runtime_disable(&pdev->dev); |
c558e39e AS |
76 | return pwm_lpss_remove(lpwm); |
77 | } | |
78 | ||
4743765b | 79 | static int pwm_lpss_prepare(struct device *dev) |
6a425ecd HG |
80 | { |
81 | struct pwm_lpss_chip *lpwm = dev_get_drvdata(dev); | |
6a425ecd | 82 | |
4743765b HG |
83 | /* |
84 | * If other device's AML code touches the PWM regs on suspend/resume | |
85 | * force runtime-resume the PWM controller to allow this. | |
86 | */ | |
87 | if (lpwm->info->other_devices_aml_touches_pwm_regs) | |
88 | return 0; /* Force runtime-resume */ | |
6a425ecd | 89 | |
4743765b | 90 | return 1; /* If runtime-suspended leave as is */ |
6a425ecd HG |
91 | } |
92 | ||
93 | static const struct dev_pm_ops pwm_lpss_platform_pm_ops = { | |
4743765b | 94 | .prepare = pwm_lpss_prepare, |
6a425ecd HG |
95 | SET_SYSTEM_SLEEP_PM_OPS(pwm_lpss_suspend, pwm_lpss_resume) |
96 | }; | |
1d375b58 | 97 | |
c558e39e AS |
98 | static const struct acpi_device_id pwm_lpss_acpi_match[] = { |
99 | { "80860F09", (unsigned long)&pwm_lpss_byt_info }, | |
100 | { "80862288", (unsigned long)&pwm_lpss_bsw_info }, | |
1688c871 | 101 | { "80862289", (unsigned long)&pwm_lpss_bsw_info }, |
03f00e53 | 102 | { "80865AC8", (unsigned long)&pwm_lpss_bxt_info }, |
c558e39e AS |
103 | { }, |
104 | }; | |
105 | MODULE_DEVICE_TABLE(acpi, pwm_lpss_acpi_match); | |
106 | ||
107 | static struct platform_driver pwm_lpss_driver_platform = { | |
108 | .driver = { | |
109 | .name = "pwm-lpss", | |
110 | .acpi_match_table = pwm_lpss_acpi_match, | |
1d375b58 | 111 | .pm = &pwm_lpss_platform_pm_ops, |
c558e39e AS |
112 | }, |
113 | .probe = pwm_lpss_probe_platform, | |
114 | .remove = pwm_lpss_remove_platform, | |
115 | }; | |
116 | module_platform_driver(pwm_lpss_driver_platform); | |
117 | ||
118 | MODULE_DESCRIPTION("PWM platform driver for Intel LPSS"); | |
119 | MODULE_LICENSE("GPL v2"); | |
120 | MODULE_ALIAS("platform:pwm-lpss"); |