blob: 472e756689174095d6a6981866bd05e7f2a26cda [file] [log] [blame]
Thomas Gleixner09c434b2019-05-19 13:08:20 +01001// SPDX-License-Identifier: GPL-2.0-only
David S. Millercca4c232008-08-29 01:29:53 -07002/* rtc-bq4802.c: TI BQ4802 RTC driver.
3 *
4 * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
5 */
6
7#include <linux/kernel.h>
8#include <linux/module.h>
9#include <linux/init.h>
10#include <linux/io.h>
11#include <linux/platform_device.h>
12#include <linux/rtc.h>
13#include <linux/bcd.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090014#include <linux/slab.h>
David S. Millercca4c232008-08-29 01:29:53 -070015
16MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
17MODULE_DESCRIPTION("TI BQ4802 RTC driver");
18MODULE_LICENSE("GPL");
19
20struct bq4802 {
21 void __iomem *regs;
David S. Miller503acc82008-09-09 19:50:04 -070022 unsigned long ioport;
David S. Millercca4c232008-08-29 01:29:53 -070023 struct rtc_device *rtc;
24 spinlock_t lock;
25 struct resource *r;
26 u8 (*read)(struct bq4802 *, int);
27 void (*write)(struct bq4802 *, int, u8);
28};
29
30static u8 bq4802_read_io(struct bq4802 *p, int off)
31{
David S. Miller503acc82008-09-09 19:50:04 -070032 return inb(p->ioport + off);
David S. Millercca4c232008-08-29 01:29:53 -070033}
34
35static void bq4802_write_io(struct bq4802 *p, int off, u8 val)
36{
David S. Miller503acc82008-09-09 19:50:04 -070037 outb(val, p->ioport + off);
David S. Millercca4c232008-08-29 01:29:53 -070038}
39
40static u8 bq4802_read_mem(struct bq4802 *p, int off)
41{
42 return readb(p->regs + off);
43}
44
45static void bq4802_write_mem(struct bq4802 *p, int off, u8 val)
46{
David S. Miller503acc82008-09-09 19:50:04 -070047 writeb(val, p->regs + off);
David S. Millercca4c232008-08-29 01:29:53 -070048}
49
50static int bq4802_read_time(struct device *dev, struct rtc_time *tm)
51{
Wolfram Sang85368bb2018-04-19 16:06:14 +020052 struct bq4802 *p = dev_get_drvdata(dev);
David S. Millercca4c232008-08-29 01:29:53 -070053 unsigned long flags;
54 unsigned int century;
55 u8 val;
56
57 spin_lock_irqsave(&p->lock, flags);
58
59 val = p->read(p, 0x0e);
60 p->write(p, 0xe, val | 0x08);
61
62 tm->tm_sec = p->read(p, 0x00);
63 tm->tm_min = p->read(p, 0x02);
64 tm->tm_hour = p->read(p, 0x04);
65 tm->tm_mday = p->read(p, 0x06);
66 tm->tm_mon = p->read(p, 0x09);
67 tm->tm_year = p->read(p, 0x0a);
68 tm->tm_wday = p->read(p, 0x08);
69 century = p->read(p, 0x0f);
70
71 p->write(p, 0x0e, val);
72
73 spin_unlock_irqrestore(&p->lock, flags);
74
Andrew Mortone232cfd2008-10-18 20:28:43 -070075 tm->tm_sec = bcd2bin(tm->tm_sec);
76 tm->tm_min = bcd2bin(tm->tm_min);
77 tm->tm_hour = bcd2bin(tm->tm_hour);
78 tm->tm_mday = bcd2bin(tm->tm_mday);
79 tm->tm_mon = bcd2bin(tm->tm_mon);
80 tm->tm_year = bcd2bin(tm->tm_year);
81 tm->tm_wday = bcd2bin(tm->tm_wday);
82 century = bcd2bin(century);
David S. Millercca4c232008-08-29 01:29:53 -070083
84 tm->tm_year += (century * 100);
85 tm->tm_year -= 1900;
86
87 tm->tm_mon--;
88
89 return 0;
90}
91
92static int bq4802_set_time(struct device *dev, struct rtc_time *tm)
93{
Wolfram Sang85368bb2018-04-19 16:06:14 +020094 struct bq4802 *p = dev_get_drvdata(dev);
David S. Millercca4c232008-08-29 01:29:53 -070095 u8 sec, min, hrs, day, mon, yrs, century, val;
96 unsigned long flags;
97 unsigned int year;
98
99 year = tm->tm_year + 1900;
100 century = year / 100;
101 yrs = year % 100;
102
103 mon = tm->tm_mon + 1; /* tm_mon starts at zero */
104 day = tm->tm_mday;
105 hrs = tm->tm_hour;
106 min = tm->tm_min;
107 sec = tm->tm_sec;
108
Andrew Mortone232cfd2008-10-18 20:28:43 -0700109 sec = bin2bcd(sec);
110 min = bin2bcd(min);
111 hrs = bin2bcd(hrs);
112 day = bin2bcd(day);
113 mon = bin2bcd(mon);
114 yrs = bin2bcd(yrs);
115 century = bin2bcd(century);
David S. Millercca4c232008-08-29 01:29:53 -0700116
117 spin_lock_irqsave(&p->lock, flags);
118
119 val = p->read(p, 0x0e);
120 p->write(p, 0x0e, val | 0x08);
121
122 p->write(p, 0x00, sec);
123 p->write(p, 0x02, min);
124 p->write(p, 0x04, hrs);
125 p->write(p, 0x06, day);
126 p->write(p, 0x09, mon);
127 p->write(p, 0x0a, yrs);
128 p->write(p, 0x0f, century);
129
130 p->write(p, 0x0e, val);
131
132 spin_unlock_irqrestore(&p->lock, flags);
133
134 return 0;
135}
136
137static const struct rtc_class_ops bq4802_ops = {
138 .read_time = bq4802_read_time,
139 .set_time = bq4802_set_time,
140};
141
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -0800142static int bq4802_probe(struct platform_device *pdev)
David S. Millercca4c232008-08-29 01:29:53 -0700143{
Jingoo Han26c5f7d2013-04-29 16:20:36 -0700144 struct bq4802 *p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
David S. Millercca4c232008-08-29 01:29:53 -0700145 int err = -ENOMEM;
146
147 if (!p)
148 goto out;
149
150 spin_lock_init(&p->lock);
151
152 p->r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
153 if (!p->r) {
154 p->r = platform_get_resource(pdev, IORESOURCE_IO, 0);
155 err = -EINVAL;
156 if (!p->r)
Jingoo Han26c5f7d2013-04-29 16:20:36 -0700157 goto out;
David S. Millercca4c232008-08-29 01:29:53 -0700158 }
159 if (p->r->flags & IORESOURCE_IO) {
David S. Miller503acc82008-09-09 19:50:04 -0700160 p->ioport = p->r->start;
David S. Millercca4c232008-08-29 01:29:53 -0700161 p->read = bq4802_read_io;
162 p->write = bq4802_write_io;
163 } else if (p->r->flags & IORESOURCE_MEM) {
Jingoo Han26c5f7d2013-04-29 16:20:36 -0700164 p->regs = devm_ioremap(&pdev->dev, p->r->start,
165 resource_size(p->r));
Zhouyang Jia7874b912018-06-12 12:40:03 +0800166 if (!p->regs){
167 err = -ENOMEM;
168 goto out;
169 }
David S. Millercca4c232008-08-29 01:29:53 -0700170 p->read = bq4802_read_mem;
171 p->write = bq4802_write_mem;
172 } else {
173 err = -EINVAL;
Jingoo Han26c5f7d2013-04-29 16:20:36 -0700174 goto out;
David S. Millercca4c232008-08-29 01:29:53 -0700175 }
176
Alessandro Zummob74d2ca2009-12-15 16:45:53 -0800177 platform_set_drvdata(pdev, p);
178
Jingoo Han26c5f7d2013-04-29 16:20:36 -0700179 p->rtc = devm_rtc_device_register(&pdev->dev, "bq4802",
180 &bq4802_ops, THIS_MODULE);
David S. Millercca4c232008-08-29 01:29:53 -0700181 if (IS_ERR(p->rtc)) {
182 err = PTR_ERR(p->rtc);
Jingoo Han26c5f7d2013-04-29 16:20:36 -0700183 goto out;
David S. Millercca4c232008-08-29 01:29:53 -0700184 }
185
David S. Millercca4c232008-08-29 01:29:53 -0700186 err = 0;
187out:
188 return err;
189
David S. Millercca4c232008-08-29 01:29:53 -0700190}
191
David S. Millercca4c232008-08-29 01:29:53 -0700192/* work with hotplug and coldplug */
193MODULE_ALIAS("platform:rtc-bq4802");
194
195static struct platform_driver bq4802_driver = {
196 .driver = {
197 .name = "rtc-bq4802",
David S. Millercca4c232008-08-29 01:29:53 -0700198 },
199 .probe = bq4802_probe,
David S. Millercca4c232008-08-29 01:29:53 -0700200};
201
Axel Lin0c4eae62012-01-10 15:10:48 -0800202module_platform_driver(bq4802_driver);