1 // SPDX-License-Identifier: GPL-2.0-only
2 /* rtc-bq4802.c: TI BQ4802 RTC driver.
32 	return inb(p->ioport + off);  in bq4802_read_io()
37 	outb(val, p->ioport + off);  in bq4802_write_io()
42 	return readb(p->regs + off);  in bq4802_read_mem()
47 	writeb(val, p->regs + off);  in bq4802_write_mem()
57 	spin_lock_irqsave(&p->lock, flags);  in bq4802_read_time()
59 	val = p->read(p, 0x0e);  in bq4802_read_time()
60 	p->write(p, 0xe, val | 0x08);  in bq4802_read_time()
62 	tm->tm_sec = p->read(p, 0x00);  in bq4802_read_time()
63 	tm->tm_min = p->read(p, 0x02);  in bq4802_read_time()
64 	tm->tm_hour = p->read(p, 0x04);  in bq4802_read_time()
65 	tm->tm_mday = p->read(p, 0x06);  in bq4802_read_time()
66 	tm->tm_mon = p->read(p, 0x09);  in bq4802_read_time()
67 	tm->tm_year = p->read(p, 0x0a);  in bq4802_read_time()
68 	tm->tm_wday = p->read(p, 0x08);  in bq4802_read_time()
69 	century = p->read(p, 0x0f);  in bq4802_read_time()
71 	p->write(p, 0x0e, val);  in bq4802_read_time()
73 	spin_unlock_irqrestore(&p->lock, flags);  in bq4802_read_time()
75 	tm->tm_sec = bcd2bin(tm->tm_sec);  in bq4802_read_time()
76 	tm->tm_min = bcd2bin(tm->tm_min);  in bq4802_read_time()
77 	tm->tm_hour = bcd2bin(tm->tm_hour);  in bq4802_read_time()
78 	tm->tm_mday = bcd2bin(tm->tm_mday);  in bq4802_read_time()
79 	tm->tm_mon = bcd2bin(tm->tm_mon);  in bq4802_read_time()
80 	tm->tm_year = bcd2bin(tm->tm_year);  in bq4802_read_time()
81 	tm->tm_wday = bcd2bin(tm->tm_wday);  in bq4802_read_time()
84 	tm->tm_year += (century * 100);  in bq4802_read_time()
85 	tm->tm_year -= 1900;  in bq4802_read_time()
87 	tm->tm_mon--;  in bq4802_read_time()
97 	unsigned int year;  in bq4802_set_time()  local
99 	year = tm->tm_year + 1900;  in bq4802_set_time()
100 	century = year / 100;  in bq4802_set_time()
101 	yrs = year % 100;  in bq4802_set_time()
103 	mon = tm->tm_mon + 1;   /* tm_mon starts at zero */  in bq4802_set_time()
104 	day = tm->tm_mday;  in bq4802_set_time()
105 	hrs = tm->tm_hour;  in bq4802_set_time()
106 	min = tm->tm_min;  in bq4802_set_time()
107 	sec = tm->tm_sec;  in bq4802_set_time()
117 	spin_lock_irqsave(&p->lock, flags);  in bq4802_set_time()
119 	val = p->read(p, 0x0e);  in bq4802_set_time()
120 	p->write(p, 0x0e, val | 0x08);  in bq4802_set_time()
122 	p->write(p, 0x00, sec);  in bq4802_set_time()
123 	p->write(p, 0x02, min);  in bq4802_set_time()
124 	p->write(p, 0x04, hrs);  in bq4802_set_time()
125 	p->write(p, 0x06, day);  in bq4802_set_time()
126 	p->write(p, 0x09, mon);  in bq4802_set_time()
127 	p->write(p, 0x0a, yrs);  in bq4802_set_time()
128 	p->write(p, 0x0f, century);  in bq4802_set_time()
130 	p->write(p, 0x0e, val);  in bq4802_set_time()
132 	spin_unlock_irqrestore(&p->lock, flags);  in bq4802_set_time()
144 	struct bq4802 *p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);  in bq4802_probe()
145 	int err = -ENOMEM;  in bq4802_probe()
150 	spin_lock_init(&p->lock);  in bq4802_probe()
152 	p->r = platform_get_resource(pdev, IORESOURCE_MEM, 0);  in bq4802_probe()
153 	if (!p->r) {  in bq4802_probe()
154 		p->r = platform_get_resource(pdev, IORESOURCE_IO, 0);  in bq4802_probe()
155 		err = -EINVAL;  in bq4802_probe()
156 		if (!p->r)  in bq4802_probe()
159 	if (p->r->flags & IORESOURCE_IO) {  in bq4802_probe()
160 		p->ioport = p->r->start;  in bq4802_probe()
161 		p->read = bq4802_read_io;  in bq4802_probe()
162 		p->write = bq4802_write_io;  in bq4802_probe()
163 	} else if (p->r->flags & IORESOURCE_MEM) {  in bq4802_probe()
164 		p->regs = devm_ioremap(&pdev->dev, p->r->start,  in bq4802_probe()
165 					resource_size(p->r));  in bq4802_probe()
166 		if (!p->regs){  in bq4802_probe()
167 			err = -ENOMEM;  in bq4802_probe()
170 		p->read = bq4802_read_mem;  in bq4802_probe()
171 		p->write = bq4802_write_mem;  in bq4802_probe()
173 		err = -EINVAL;  in bq4802_probe()
179 	p->rtc = devm_rtc_device_register(&pdev->dev, "bq4802",  in bq4802_probe()
181 	if (IS_ERR(p->rtc)) {  in bq4802_probe()
182 		err = PTR_ERR(p->rtc);  in bq4802_probe()
193 MODULE_ALIAS("platform:rtc-bq4802");
197 		.name	= "rtc-bq4802",