Blame view
drivers/rtc/rtc-m48t35.c
4.6 KB
d1dbd82e2 RTC: M48T35: new ... |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 |
/* * Driver for the SGS-Thomson M48T35 Timekeeper RAM chip * * Copyright (C) 2000 Silicon Graphics, Inc. * Written by Ulf Carlsson (ulfc@engr.sgi.com) * * Copyright (C) 2008 Thomas Bogendoerfer * * Based on code written by Paul Gortmaker. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. */ #include <linux/module.h> #include <linux/rtc.h> |
5a0e3ad6a include cleanup: ... |
19 |
#include <linux/slab.h> |
d1dbd82e2 RTC: M48T35: new ... |
20 21 |
#include <linux/platform_device.h> #include <linux/bcd.h> |
d7a6119f4 rtc: rtc-ds1286 a... |
22 |
#include <linux/io.h> |
8ff7b7d90 drivers/rtc/rtc-m... |
23 |
#include <linux/err.h> |
d1dbd82e2 RTC: M48T35: new ... |
24 |
|
d1dbd82e2 RTC: M48T35: new ... |
25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 |
struct m48t35_rtc { u8 pad[0x7ff8]; /* starts at 0x7ff8 */ u8 control; u8 sec; u8 min; u8 hour; u8 day; u8 date; u8 month; u8 year; }; #define M48T35_RTC_SET 0x80 #define M48T35_RTC_READ 0x40 struct m48t35_priv { struct rtc_device *rtc; struct m48t35_rtc __iomem *reg; size_t size; unsigned long baseaddr; spinlock_t lock; }; static int m48t35_read_time(struct device *dev, struct rtc_time *tm) { struct m48t35_priv *priv = dev_get_drvdata(dev); u8 control; /* * Only the values that we read from the RTC are set. We leave * tm_wday, tm_yday and tm_isdst untouched. Even though the * RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated * by the RTC when initially set to a non-zero value. */ spin_lock_irq(&priv->lock); control = readb(&priv->reg->control); writeb(control | M48T35_RTC_READ, &priv->reg->control); tm->tm_sec = readb(&priv->reg->sec); tm->tm_min = readb(&priv->reg->min); tm->tm_hour = readb(&priv->reg->hour); tm->tm_mday = readb(&priv->reg->date); tm->tm_mon = readb(&priv->reg->month); tm->tm_year = readb(&priv->reg->year); writeb(control, &priv->reg->control); spin_unlock_irq(&priv->lock); tm->tm_sec = bcd2bin(tm->tm_sec); tm->tm_min = bcd2bin(tm->tm_min); tm->tm_hour = bcd2bin(tm->tm_hour); tm->tm_mday = bcd2bin(tm->tm_mday); tm->tm_mon = bcd2bin(tm->tm_mon); tm->tm_year = bcd2bin(tm->tm_year); /* * Account for differences between how the RTC uses the values * and how they are defined in a struct rtc_time; */ tm->tm_year += 70; if (tm->tm_year <= 69) tm->tm_year += 100; tm->tm_mon--; return rtc_valid_tm(tm); } static int m48t35_set_time(struct device *dev, struct rtc_time *tm) { struct m48t35_priv *priv = dev_get_drvdata(dev); unsigned char mon, day, hrs, min, sec; unsigned int yrs; u8 control; yrs = tm->tm_year + 1900; mon = tm->tm_mon + 1; /* tm_mon starts at zero */ day = tm->tm_mday; hrs = tm->tm_hour; min = tm->tm_min; sec = tm->tm_sec; if (yrs < 1970) return -EINVAL; yrs -= 1970; if (yrs > 255) /* They are unsigned */ return -EINVAL; if (yrs > 169) return -EINVAL; if (yrs >= 100) yrs -= 100; sec = bin2bcd(sec); min = bin2bcd(min); hrs = bin2bcd(hrs); day = bin2bcd(day); mon = bin2bcd(mon); yrs = bin2bcd(yrs); spin_lock_irq(&priv->lock); control = readb(&priv->reg->control); writeb(control | M48T35_RTC_SET, &priv->reg->control); writeb(yrs, &priv->reg->year); writeb(mon, &priv->reg->month); writeb(day, &priv->reg->date); writeb(hrs, &priv->reg->hour); writeb(min, &priv->reg->min); writeb(sec, &priv->reg->sec); writeb(control, &priv->reg->control); spin_unlock_irq(&priv->lock); return 0; } static const struct rtc_class_ops m48t35_ops = { .read_time = m48t35_read_time, .set_time = m48t35_set_time, }; |
5a167f454 Drivers: rtc: rem... |
142 |
static int m48t35_probe(struct platform_device *pdev) |
d1dbd82e2 RTC: M48T35: new ... |
143 |
{ |
d1dbd82e2 RTC: M48T35: new ... |
144 145 |
struct resource *res; struct m48t35_priv *priv; |
d1dbd82e2 RTC: M48T35: new ... |
146 147 148 149 |
res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) return -ENODEV; |
4f58cd9b4 drivers/rtc/rtc-m... |
150 |
priv = devm_kzalloc(&pdev->dev, sizeof(struct m48t35_priv), GFP_KERNEL); |
d1dbd82e2 RTC: M48T35: new ... |
151 152 |
if (!priv) return -ENOMEM; |
28f65c11f treewide: Convert... |
153 |
priv->size = resource_size(res); |
d1dbd82e2 RTC: M48T35: new ... |
154 155 156 157 158 |
/* * kludge: remove the #ifndef after ioc3 resource * conflicts are resolved */ #ifndef CONFIG_SGI_IP27 |
4f58cd9b4 drivers/rtc/rtc-m... |
159 160 161 |
if (!devm_request_mem_region(&pdev->dev, res->start, priv->size, pdev->name)) return -EBUSY; |
d1dbd82e2 RTC: M48T35: new ... |
162 163 |
#endif priv->baseaddr = res->start; |
4f58cd9b4 drivers/rtc/rtc-m... |
164 165 166 |
priv->reg = devm_ioremap(&pdev->dev, priv->baseaddr, priv->size); if (!priv->reg) return -ENOMEM; |
b74d2caa6 rtc: fix driver d... |
167 |
|
d1dbd82e2 RTC: M48T35: new ... |
168 |
spin_lock_init(&priv->lock); |
b74d2caa6 rtc: fix driver d... |
169 170 |
platform_set_drvdata(pdev, priv); |
4f58cd9b4 drivers/rtc/rtc-m... |
171 |
priv->rtc = devm_rtc_device_register(&pdev->dev, "m48t35", |
d1dbd82e2 RTC: M48T35: new ... |
172 |
&m48t35_ops, THIS_MODULE); |
dac30a984 drivers/rtc: Repl... |
173 |
return PTR_ERR_OR_ZERO(priv->rtc); |
d1dbd82e2 RTC: M48T35: new ... |
174 |
} |
d1dbd82e2 RTC: M48T35: new ... |
175 176 177 |
static struct platform_driver m48t35_platform_driver = { .driver = { .name = "rtc-m48t35", |
d1dbd82e2 RTC: M48T35: new ... |
178 179 |
}, .probe = m48t35_probe, |
d1dbd82e2 RTC: M48T35: new ... |
180 |
}; |
0c4eae665 rtc: convert driv... |
181 |
module_platform_driver(m48t35_platform_driver); |
d1dbd82e2 RTC: M48T35: new ... |
182 183 184 185 |
MODULE_AUTHOR("Thomas Bogendoerfer <tsbogend@alpha.franken.de>"); MODULE_DESCRIPTION("M48T35 RTC driver"); MODULE_LICENSE("GPL"); |
d1dbd82e2 RTC: M48T35: new ... |
186 |
MODULE_ALIAS("platform:rtc-m48t35"); |