^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* rtc-bq4802.c: TI BQ4802 RTC driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/rtc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/bcd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) MODULE_DESCRIPTION("TI BQ4802 RTC driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) struct bq4802 {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) void __iomem *regs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) unsigned long ioport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) struct rtc_device *rtc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) spinlock_t lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) struct resource *r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) u8 (*read)(struct bq4802 *, int);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) void (*write)(struct bq4802 *, int, u8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) static u8 bq4802_read_io(struct bq4802 *p, int off)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) return inb(p->ioport + off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) static void bq4802_write_io(struct bq4802 *p, int off, u8 val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) outb(val, p->ioport + off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) static u8 bq4802_read_mem(struct bq4802 *p, int off)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) return readb(p->regs + off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) static void bq4802_write_mem(struct bq4802 *p, int off, u8 val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) writeb(val, p->regs + off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static int bq4802_read_time(struct device *dev, struct rtc_time *tm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) struct bq4802 *p = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) unsigned int century;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) u8 val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) spin_lock_irqsave(&p->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) val = p->read(p, 0x0e);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) p->write(p, 0xe, val | 0x08);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) tm->tm_sec = p->read(p, 0x00);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) tm->tm_min = p->read(p, 0x02);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) tm->tm_hour = p->read(p, 0x04);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) tm->tm_mday = p->read(p, 0x06);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) tm->tm_mon = p->read(p, 0x09);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) tm->tm_year = p->read(p, 0x0a);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) tm->tm_wday = p->read(p, 0x08);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) century = p->read(p, 0x0f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) p->write(p, 0x0e, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) spin_unlock_irqrestore(&p->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) tm->tm_sec = bcd2bin(tm->tm_sec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) tm->tm_min = bcd2bin(tm->tm_min);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) tm->tm_hour = bcd2bin(tm->tm_hour);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) tm->tm_mday = bcd2bin(tm->tm_mday);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) tm->tm_mon = bcd2bin(tm->tm_mon);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) tm->tm_year = bcd2bin(tm->tm_year);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) tm->tm_wday = bcd2bin(tm->tm_wday);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) century = bcd2bin(century);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) tm->tm_year += (century * 100);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) tm->tm_year -= 1900;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) tm->tm_mon--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) static int bq4802_set_time(struct device *dev, struct rtc_time *tm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) struct bq4802 *p = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) u8 sec, min, hrs, day, mon, yrs, century, val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) unsigned int year;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) year = tm->tm_year + 1900;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) century = year / 100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) yrs = year % 100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) mon = tm->tm_mon + 1; /* tm_mon starts at zero */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) day = tm->tm_mday;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) hrs = tm->tm_hour;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) min = tm->tm_min;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) sec = tm->tm_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) sec = bin2bcd(sec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) min = bin2bcd(min);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) hrs = bin2bcd(hrs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) day = bin2bcd(day);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) mon = bin2bcd(mon);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) yrs = bin2bcd(yrs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) century = bin2bcd(century);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) spin_lock_irqsave(&p->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) val = p->read(p, 0x0e);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) p->write(p, 0x0e, val | 0x08);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) p->write(p, 0x00, sec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) p->write(p, 0x02, min);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) p->write(p, 0x04, hrs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) p->write(p, 0x06, day);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) p->write(p, 0x09, mon);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) p->write(p, 0x0a, yrs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) p->write(p, 0x0f, century);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) p->write(p, 0x0e, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) spin_unlock_irqrestore(&p->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) static const struct rtc_class_ops bq4802_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) .read_time = bq4802_read_time,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) .set_time = bq4802_set_time,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) static int bq4802_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) struct bq4802 *p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) int err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) if (!p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) spin_lock_init(&p->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) p->r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) if (!p->r) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) p->r = platform_get_resource(pdev, IORESOURCE_IO, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) if (!p->r)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) if (p->r->flags & IORESOURCE_IO) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) p->ioport = p->r->start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) p->read = bq4802_read_io;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) p->write = bq4802_write_io;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) } else if (p->r->flags & IORESOURCE_MEM) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) p->regs = devm_ioremap(&pdev->dev, p->r->start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) resource_size(p->r));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (!p->regs){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) p->read = bq4802_read_mem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) p->write = bq4802_write_mem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) platform_set_drvdata(pdev, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) p->rtc = devm_rtc_device_register(&pdev->dev, "bq4802",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) &bq4802_ops, THIS_MODULE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) if (IS_ERR(p->rtc)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) err = PTR_ERR(p->rtc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) /* work with hotplug and coldplug */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) MODULE_ALIAS("platform:rtc-bq4802");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) static struct platform_driver bq4802_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) .name = "rtc-bq4802",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) .probe = bq4802_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) module_platform_driver(bq4802_driver);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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