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af0ba001 PA |
1 | /* |
2 | * TI PWM Subsystem driver | |
3 | * | |
4 | * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/ | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | */ | |
17 | ||
18 | #include <linux/module.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/io.h> | |
21 | #include <linux/err.h> | |
22 | #include <linux/pm_runtime.h> | |
23 | #include <linux/of_device.h> | |
24 | ||
25 | #include "pwm-tipwmss.h" | |
26 | ||
27 | #define PWMSS_CLKCONFIG 0x8 /* Clock gating reg */ | |
28 | #define PWMSS_CLKSTATUS 0xc /* Clock gating status reg */ | |
29 | ||
30 | struct pwmss_info { | |
31 | void __iomem *mmio_base; | |
32 | struct mutex pwmss_lock; | |
33 | u16 pwmss_clkconfig; | |
34 | }; | |
35 | ||
36 | u16 pwmss_submodule_state_change(struct device *dev, int set) | |
37 | { | |
38 | struct pwmss_info *info = dev_get_drvdata(dev); | |
39 | u16 val; | |
40 | ||
41 | mutex_lock(&info->pwmss_lock); | |
42 | val = readw(info->mmio_base + PWMSS_CLKCONFIG); | |
43 | val |= set; | |
44 | writew(val , info->mmio_base + PWMSS_CLKCONFIG); | |
45 | mutex_unlock(&info->pwmss_lock); | |
46 | ||
47 | return readw(info->mmio_base + PWMSS_CLKSTATUS); | |
48 | } | |
49 | EXPORT_SYMBOL(pwmss_submodule_state_change); | |
50 | ||
51 | static const struct of_device_id pwmss_of_match[] = { | |
52 | { .compatible = "ti,am33xx-pwmss" }, | |
53 | {}, | |
54 | }; | |
55 | MODULE_DEVICE_TABLE(of, pwmss_of_match); | |
56 | ||
57 | static int pwmss_probe(struct platform_device *pdev) | |
58 | { | |
59 | int ret; | |
60 | struct resource *r; | |
61 | struct pwmss_info *info; | |
62 | struct device_node *node = pdev->dev.of_node; | |
63 | ||
64 | info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); | |
ed1a819a | 65 | if (!info) |
af0ba001 | 66 | return -ENOMEM; |
af0ba001 PA |
67 | |
68 | mutex_init(&info->pwmss_lock); | |
69 | ||
70 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
6d4294d1 TR |
71 | info->mmio_base = devm_ioremap_resource(&pdev->dev, r); |
72 | if (IS_ERR(info->mmio_base)) | |
73 | return PTR_ERR(info->mmio_base); | |
af0ba001 PA |
74 | |
75 | pm_runtime_enable(&pdev->dev); | |
76 | pm_runtime_get_sync(&pdev->dev); | |
77 | platform_set_drvdata(pdev, info); | |
78 | ||
79 | /* Populate all the child nodes here... */ | |
80 | ret = of_platform_populate(node, NULL, NULL, &pdev->dev); | |
81 | if (ret) | |
82 | dev_err(&pdev->dev, "no child node found\n"); | |
83 | ||
84 | return ret; | |
85 | } | |
86 | ||
87 | static int pwmss_remove(struct platform_device *pdev) | |
88 | { | |
89 | struct pwmss_info *info = platform_get_drvdata(pdev); | |
90 | ||
91 | pm_runtime_put_sync(&pdev->dev); | |
92 | pm_runtime_disable(&pdev->dev); | |
93 | mutex_destroy(&info->pwmss_lock); | |
94 | return 0; | |
95 | } | |
96 | ||
c26e9bb4 | 97 | #ifdef CONFIG_PM_SLEEP |
af0ba001 PA |
98 | static int pwmss_suspend(struct device *dev) |
99 | { | |
100 | struct pwmss_info *info = dev_get_drvdata(dev); | |
101 | ||
102 | info->pwmss_clkconfig = readw(info->mmio_base + PWMSS_CLKCONFIG); | |
103 | pm_runtime_put_sync(dev); | |
104 | return 0; | |
105 | } | |
106 | ||
107 | static int pwmss_resume(struct device *dev) | |
108 | { | |
109 | struct pwmss_info *info = dev_get_drvdata(dev); | |
110 | ||
111 | pm_runtime_get_sync(dev); | |
112 | writew(info->pwmss_clkconfig, info->mmio_base + PWMSS_CLKCONFIG); | |
113 | return 0; | |
114 | } | |
c26e9bb4 | 115 | #endif |
af0ba001 PA |
116 | |
117 | static SIMPLE_DEV_PM_OPS(pwmss_pm_ops, pwmss_suspend, pwmss_resume); | |
118 | ||
119 | static struct platform_driver pwmss_driver = { | |
120 | .driver = { | |
121 | .name = "pwmss", | |
af0ba001 PA |
122 | .pm = &pwmss_pm_ops, |
123 | .of_match_table = pwmss_of_match, | |
124 | }, | |
125 | .probe = pwmss_probe, | |
126 | .remove = pwmss_remove, | |
127 | }; | |
128 | ||
129 | module_platform_driver(pwmss_driver); | |
130 | ||
131 | MODULE_DESCRIPTION("PWM Subsystem driver"); | |
132 | MODULE_AUTHOR("Texas Instruments"); | |
133 | MODULE_LICENSE("GPL"); |