xref: /openbmc/u-boot/drivers/rtc/rtc-uclass.c (revision 9450ab2b)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2015 Google, Inc
4  * Written by Simon Glass <sjg@chromium.org>
5  */
6 
7 #include <common.h>
8 #include <dm.h>
9 #include <errno.h>
10 #include <rtc.h>
11 
dm_rtc_get(struct udevice * dev,struct rtc_time * time)12 int dm_rtc_get(struct udevice *dev, struct rtc_time *time)
13 {
14 	struct rtc_ops *ops = rtc_get_ops(dev);
15 
16 	assert(ops);
17 	if (!ops->get)
18 		return -ENOSYS;
19 	return ops->get(dev, time);
20 }
21 
dm_rtc_set(struct udevice * dev,struct rtc_time * time)22 int dm_rtc_set(struct udevice *dev, struct rtc_time *time)
23 {
24 	struct rtc_ops *ops = rtc_get_ops(dev);
25 
26 	assert(ops);
27 	if (!ops->set)
28 		return -ENOSYS;
29 	return ops->set(dev, time);
30 }
31 
dm_rtc_reset(struct udevice * dev)32 int dm_rtc_reset(struct udevice *dev)
33 {
34 	struct rtc_ops *ops = rtc_get_ops(dev);
35 
36 	assert(ops);
37 	if (!ops->reset)
38 		return -ENOSYS;
39 	return ops->reset(dev);
40 }
41 
rtc_read8(struct udevice * dev,unsigned int reg)42 int rtc_read8(struct udevice *dev, unsigned int reg)
43 {
44 	struct rtc_ops *ops = rtc_get_ops(dev);
45 
46 	assert(ops);
47 	if (!ops->read8)
48 		return -ENOSYS;
49 	return ops->read8(dev, reg);
50 }
51 
rtc_write8(struct udevice * dev,unsigned int reg,int val)52 int rtc_write8(struct udevice *dev, unsigned int reg, int val)
53 {
54 	struct rtc_ops *ops = rtc_get_ops(dev);
55 
56 	assert(ops);
57 	if (!ops->write8)
58 		return -ENOSYS;
59 	return ops->write8(dev, reg, val);
60 }
61 
rtc_read16(struct udevice * dev,unsigned int reg,u16 * valuep)62 int rtc_read16(struct udevice *dev, unsigned int reg, u16 *valuep)
63 {
64 	u16 value = 0;
65 	int ret;
66 	int i;
67 
68 	for (i = 0; i < sizeof(value); i++) {
69 		ret = rtc_read8(dev, reg + i);
70 		if (ret < 0)
71 			return ret;
72 		value |= ret << (i << 3);
73 	}
74 
75 	*valuep = value;
76 	return 0;
77 }
78 
rtc_write16(struct udevice * dev,unsigned int reg,u16 value)79 int rtc_write16(struct udevice *dev, unsigned int reg, u16 value)
80 {
81 	int i, ret;
82 
83 	for (i = 0; i < sizeof(value); i++) {
84 		ret = rtc_write8(dev, reg + i, (value >> (i << 3)) & 0xff);
85 		if (ret)
86 			return ret;
87 	}
88 
89 	return 0;
90 }
91 
rtc_read32(struct udevice * dev,unsigned int reg,u32 * valuep)92 int rtc_read32(struct udevice *dev, unsigned int reg, u32 *valuep)
93 {
94 	u32 value = 0;
95 	int ret;
96 	int i;
97 
98 	for (i = 0; i < sizeof(value); i++) {
99 		ret = rtc_read8(dev, reg + i);
100 		if (ret < 0)
101 			return ret;
102 		value |= ret << (i << 3);
103 	}
104 
105 	*valuep = value;
106 	return 0;
107 }
108 
rtc_write32(struct udevice * dev,unsigned int reg,u32 value)109 int rtc_write32(struct udevice *dev, unsigned int reg, u32 value)
110 {
111 	int i, ret;
112 
113 	for (i = 0; i < sizeof(value); i++) {
114 		ret = rtc_write8(dev, reg + i, (value >> (i << 3)) & 0xff);
115 		if (ret)
116 			return ret;
117 	}
118 
119 	return 0;
120 }
121 
122 UCLASS_DRIVER(rtc) = {
123 	.name		= "rtc",
124 	.id		= UCLASS_RTC,
125 	.post_bind	= dm_scan_fdt_dev,
126 };
127