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 #define LOG_CATEGORY UCLASS_RTC
8
9 #include <common.h>
10 #include <dm.h>
11 #include <errno.h>
12 #include <log.h>
13 #include <rtc.h>
14
dm_rtc_get(struct udevice * dev,struct rtc_time * time)15 int dm_rtc_get(struct udevice *dev, struct rtc_time *time)
16 {
17 struct rtc_ops *ops = rtc_get_ops(dev);
18
19 assert(ops);
20 if (!ops->get)
21 return -ENOSYS;
22 return ops->get(dev, time);
23 }
24
dm_rtc_set(struct udevice * dev,struct rtc_time * time)25 int dm_rtc_set(struct udevice *dev, struct rtc_time *time)
26 {
27 struct rtc_ops *ops = rtc_get_ops(dev);
28
29 assert(ops);
30 if (!ops->set)
31 return -ENOSYS;
32 return ops->set(dev, time);
33 }
34
dm_rtc_reset(struct udevice * dev)35 int dm_rtc_reset(struct udevice *dev)
36 {
37 struct rtc_ops *ops = rtc_get_ops(dev);
38
39 assert(ops);
40 if (!ops->reset)
41 return -ENOSYS;
42 return ops->reset(dev);
43 }
44
dm_rtc_read(struct udevice * dev,unsigned int reg,u8 * buf,unsigned int len)45 int dm_rtc_read(struct udevice *dev, unsigned int reg, u8 *buf, unsigned int len)
46 {
47 struct rtc_ops *ops = rtc_get_ops(dev);
48
49 assert(ops);
50 if (ops->read)
51 return ops->read(dev, reg, buf, len);
52 if (!ops->read8)
53 return -ENOSYS;
54 while (len--) {
55 int ret = ops->read8(dev, reg++);
56
57 if (ret < 0)
58 return ret;
59 *buf++ = ret;
60 }
61 return 0;
62 }
63
dm_rtc_write(struct udevice * dev,unsigned int reg,const u8 * buf,unsigned int len)64 int dm_rtc_write(struct udevice *dev, unsigned int reg,
65 const u8 *buf, unsigned int len)
66 {
67 struct rtc_ops *ops = rtc_get_ops(dev);
68
69 assert(ops);
70 if (ops->write)
71 return ops->write(dev, reg, buf, len);
72 if (!ops->write8)
73 return -ENOSYS;
74 while (len--) {
75 int ret = ops->write8(dev, reg++, *buf++);
76
77 if (ret < 0)
78 return ret;
79 }
80 return 0;
81 }
82
rtc_read8(struct udevice * dev,unsigned int reg)83 int rtc_read8(struct udevice *dev, unsigned int reg)
84 {
85 struct rtc_ops *ops = rtc_get_ops(dev);
86
87 assert(ops);
88 if (ops->read8)
89 return ops->read8(dev, reg);
90 if (ops->read) {
91 u8 buf[1];
92 int ret = ops->read(dev, reg, buf, 1);
93
94 if (ret < 0)
95 return ret;
96 return buf[0];
97 }
98 return -ENOSYS;
99 }
100
rtc_write8(struct udevice * dev,unsigned int reg,int val)101 int rtc_write8(struct udevice *dev, unsigned int reg, int val)
102 {
103 struct rtc_ops *ops = rtc_get_ops(dev);
104
105 assert(ops);
106 if (ops->write8)
107 return ops->write8(dev, reg, val);
108 if (ops->write) {
109 u8 buf[1] = { val };
110
111 return ops->write(dev, reg, buf, 1);
112 }
113 return -ENOSYS;
114 }
115
rtc_read16(struct udevice * dev,unsigned int reg,u16 * valuep)116 int rtc_read16(struct udevice *dev, unsigned int reg, u16 *valuep)
117 {
118 u16 value = 0;
119 int ret;
120 int i;
121
122 for (i = 0; i < sizeof(value); i++) {
123 ret = rtc_read8(dev, reg + i);
124 if (ret < 0)
125 return ret;
126 value |= ret << (i << 3);
127 }
128
129 *valuep = value;
130 return 0;
131 }
132
rtc_write16(struct udevice * dev,unsigned int reg,u16 value)133 int rtc_write16(struct udevice *dev, unsigned int reg, u16 value)
134 {
135 int i, ret;
136
137 for (i = 0; i < sizeof(value); i++) {
138 ret = rtc_write8(dev, reg + i, (value >> (i << 3)) & 0xff);
139 if (ret)
140 return ret;
141 }
142
143 return 0;
144 }
145
rtc_read32(struct udevice * dev,unsigned int reg,u32 * valuep)146 int rtc_read32(struct udevice *dev, unsigned int reg, u32 *valuep)
147 {
148 u32 value = 0;
149 int ret;
150 int i;
151
152 for (i = 0; i < sizeof(value); i++) {
153 ret = rtc_read8(dev, reg + i);
154 if (ret < 0)
155 return ret;
156 value |= ret << (i << 3);
157 }
158
159 *valuep = value;
160 return 0;
161 }
162
rtc_write32(struct udevice * dev,unsigned int reg,u32 value)163 int rtc_write32(struct udevice *dev, unsigned int reg, u32 value)
164 {
165 int i, ret;
166
167 for (i = 0; i < sizeof(value); i++) {
168 ret = rtc_write8(dev, reg + i, (value >> (i << 3)) & 0xff);
169 if (ret)
170 return ret;
171 }
172
173 return 0;
174 }
175
176 UCLASS_DRIVER(rtc) = {
177 .name = "rtc",
178 .id = UCLASS_RTC,
179 .flags = DM_UC_FLAG_SEQ_ALIAS,
180 #if CONFIG_IS_ENABLED(OF_REAL)
181 .post_bind = dm_scan_fdt_dev,
182 #endif
183 };
184