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1/* $Id: rtc.c,v 1.28 2001/10/08 22:19:51 davem Exp $
2 *
3 * Linux/SPARC Real Time Clock Driver
4 * Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu)
5 *
6 * This is a little driver that lets a user-level program access
7 * the SPARC Mostek real time clock chip. It is no use unless you
8 * use the modified clock utility.
9 *
10 * Get the modified clock utility from:
11 * ftp://vger.kernel.org/pub/linux/Sparc/userland/clock.c
12 */
13
14#include <linux/module.h>
15#include <linux/types.h>
16#include <linux/errno.h>
17#include <linux/miscdevice.h>
18#include <linux/slab.h>
19#include <linux/fcntl.h>
20#include <linux/poll.h>
21#include <linux/init.h>
22#include <linux/smp_lock.h>
23#include <asm/io.h>
24#include <asm/mostek.h>
25#include <asm/system.h>
26#include <asm/uaccess.h>
27#include <asm/rtc.h>
28
29static int rtc_busy = 0;
30
31/* This is the structure layout used by drivers/char/rtc.c, we
32 * support that driver's ioctls so that things are less messy in
33 * userspace.
34 */
35struct rtc_time_generic {
36 int tm_sec;
37 int tm_min;
38 int tm_hour;
39 int tm_mday;
40 int tm_mon;
41 int tm_year;
42 int tm_wday;
43 int tm_yday;
44 int tm_isdst;
45};
46#define RTC_AIE_ON _IO('p', 0x01) /* Alarm int. enable on */
47#define RTC_AIE_OFF _IO('p', 0x02) /* ... off */
48#define RTC_UIE_ON _IO('p', 0x03) /* Update int. enable on */
49#define RTC_UIE_OFF _IO('p', 0x04) /* ... off */
50#define RTC_PIE_ON _IO('p', 0x05) /* Periodic int. enable on */
51#define RTC_PIE_OFF _IO('p', 0x06) /* ... off */
52#define RTC_WIE_ON _IO('p', 0x0f) /* Watchdog int. enable on */
53#define RTC_WIE_OFF _IO('p', 0x10) /* ... off */
54#define RTC_RD_TIME _IOR('p', 0x09, struct rtc_time_generic) /* Read RTC time */
55#define RTC_SET_TIME _IOW('p', 0x0a, struct rtc_time_generic) /* Set RTC time */
56#define RTC_ALM_SET _IOW('p', 0x07, struct rtc_time) /* Set alarm time */
57#define RTC_ALM_READ _IOR('p', 0x08, struct rtc_time) /* Read alarm time */
58#define RTC_IRQP_READ _IOR('p', 0x0b, unsigned long) /* Read IRQ rate */
59#define RTC_IRQP_SET _IOW('p', 0x0c, unsigned long) /* Set IRQ rate */
60#define RTC_EPOCH_READ _IOR('p', 0x0d, unsigned long) /* Read epoch */
61#define RTC_EPOCH_SET _IOW('p', 0x0e, unsigned long) /* Set epoch */
62#define RTC_WKALM_SET _IOW('p', 0x0f, struct rtc_wkalrm)/* Set wakeup alarm*/
63#define RTC_WKALM_RD _IOR('p', 0x10, struct rtc_wkalrm)/* Get wakeup alarm*/
64#define RTC_PLL_GET _IOR('p', 0x11, struct rtc_pll_info) /* Get PLL correction */
65#define RTC_PLL_SET _IOW('p', 0x12, struct rtc_pll_info) /* Set PLL correction */
66
67/* Retrieve the current date and time from the real time clock. */
68static void get_rtc_time(struct rtc_time *t)
69{
70 void __iomem *regs = mstk48t02_regs;
71 u8 tmp;
72
73 spin_lock_irq(&mostek_lock);
74
75 tmp = mostek_read(regs + MOSTEK_CREG);
76 tmp |= MSTK_CREG_READ;
77 mostek_write(regs + MOSTEK_CREG, tmp);
78
79 t->sec = MSTK_REG_SEC(regs);
80 t->min = MSTK_REG_MIN(regs);
81 t->hour = MSTK_REG_HOUR(regs);
82 t->dow = MSTK_REG_DOW(regs);
83 t->dom = MSTK_REG_DOM(regs);
84 t->month = MSTK_REG_MONTH(regs);
85 t->year = MSTK_CVT_YEAR( MSTK_REG_YEAR(regs) );
86
87 tmp = mostek_read(regs + MOSTEK_CREG);
88 tmp &= ~MSTK_CREG_READ;
89 mostek_write(regs + MOSTEK_CREG, tmp);
90
91 spin_unlock_irq(&mostek_lock);
92}
93
94/* Set the current date and time inthe real time clock. */
95void set_rtc_time(struct rtc_time *t)
96{
97 void __iomem *regs = mstk48t02_regs;
98 u8 tmp;
99
100 spin_lock_irq(&mostek_lock);
101
102 tmp = mostek_read(regs + MOSTEK_CREG);
103 tmp |= MSTK_CREG_WRITE;
104 mostek_write(regs + MOSTEK_CREG, tmp);
105
106 MSTK_SET_REG_SEC(regs,t->sec);
107 MSTK_SET_REG_MIN(regs,t->min);
108 MSTK_SET_REG_HOUR(regs,t->hour);
109 MSTK_SET_REG_DOW(regs,t->dow);
110 MSTK_SET_REG_DOM(regs,t->dom);
111 MSTK_SET_REG_MONTH(regs,t->month);
112 MSTK_SET_REG_YEAR(regs,t->year - MSTK_YEAR_ZERO);
113
114 tmp = mostek_read(regs + MOSTEK_CREG);
115 tmp &= ~MSTK_CREG_WRITE;
116 mostek_write(regs + MOSTEK_CREG, tmp);
117
118 spin_unlock_irq(&mostek_lock);
119}
120
121static int put_rtc_time_generic(void __user *argp, struct rtc_time *tm)
122{
123 struct rtc_time_generic __user *utm = argp;
124
125 if (__put_user(tm->sec, &utm->tm_sec) ||
126 __put_user(tm->min, &utm->tm_min) ||
127 __put_user(tm->hour, &utm->tm_hour) ||
128 __put_user(tm->dom, &utm->tm_mday) ||
129 __put_user(tm->month, &utm->tm_mon) ||
130 __put_user(tm->year, &utm->tm_year) ||
131 __put_user(tm->dow, &utm->tm_wday) ||
132 __put_user(0, &utm->tm_yday) ||
133 __put_user(0, &utm->tm_isdst))
134 return -EFAULT;
135
136 return 0;
137}
138
139static int get_rtc_time_generic(struct rtc_time *tm, void __user *argp)
140{
141 struct rtc_time_generic __user *utm = argp;
142
143 if (__get_user(tm->sec, &utm->tm_sec) ||
144 __get_user(tm->min, &utm->tm_min) ||
145 __get_user(tm->hour, &utm->tm_hour) ||
146 __get_user(tm->dom, &utm->tm_mday) ||
147 __get_user(tm->month, &utm->tm_mon) ||
148 __get_user(tm->year, &utm->tm_year) ||
149 __get_user(tm->dow, &utm->tm_wday))
150 return -EFAULT;
151
152 return 0;
153}
154
155static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
156 unsigned long arg)
157{
158 struct rtc_time rtc_tm;
159 void __user *argp = (void __user *)arg;
160
161 switch (cmd) {
162 /* No interrupt support, return an error
163 * compatible with drivers/char/rtc.c
164 */
165 case RTC_AIE_OFF:
166 case RTC_AIE_ON:
167 case RTC_PIE_OFF:
168 case RTC_PIE_ON:
169 case RTC_UIE_OFF:
170 case RTC_UIE_ON:
171 case RTC_IRQP_READ:
172 case RTC_IRQP_SET:
173 case RTC_EPOCH_SET:
174 case RTC_EPOCH_READ:
175 return -EINVAL;
176
177 case RTCGET:
178 case RTC_RD_TIME:
179 memset(&rtc_tm, 0, sizeof(struct rtc_time));
180 get_rtc_time(&rtc_tm);
181
182 if (cmd == RTCGET) {
183 if (copy_to_user(argp, &rtc_tm,
184 sizeof(struct rtc_time)))
185 return -EFAULT;
186 } else if (put_rtc_time_generic(argp, &rtc_tm))
187 return -EFAULT;
188
189 return 0;
190
191
192 case RTCSET:
193 case RTC_SET_TIME:
194 if (!capable(CAP_SYS_TIME))
195 return -EPERM;
196
197 if (cmd == RTCSET) {
198 if (copy_from_user(&rtc_tm, argp,
199 sizeof(struct rtc_time)))
200 return -EFAULT;
201 } else if (get_rtc_time_generic(&rtc_tm, argp))
202 return -EFAULT;
203
204 set_rtc_time(&rtc_tm);
205
206 return 0;
207
208 default:
209 return -EINVAL;
210 }
211}
212
213static int rtc_open(struct inode *inode, struct file *file)
214{
215 int ret;
216
217 spin_lock_irq(&mostek_lock);
218 if (rtc_busy) {
219 ret = -EBUSY;
220 } else {
221 rtc_busy = 1;
222 ret = 0;
223 }
224 spin_unlock_irq(&mostek_lock);
225
226 return ret;
227}
228
229static int rtc_release(struct inode *inode, struct file *file)
230{
231 rtc_busy = 0;
232
233 return 0;
234}
235
236static const struct file_operations rtc_fops = {
237 .owner = THIS_MODULE,
238 .llseek = no_llseek,
239 .ioctl = rtc_ioctl,
240 .open = rtc_open,
241 .release = rtc_release,
242};
243
244static struct miscdevice rtc_dev = { RTC_MINOR, "rtc", &rtc_fops };
245
246static int __init rtc_sun_init(void)
247{
248 int error;
249
250 /* It is possible we are being driven by some other RTC chip
251 * and thus another RTC driver is handling things.
252 */
253 if (!mstk48t02_regs)
254 return -ENODEV;
255
256 error = misc_register(&rtc_dev);
257 if (error) {
258 printk(KERN_ERR "rtc: unable to get misc minor for Mostek\n");
259 return error;
260 }
261 printk("rtc_sun_init: Registered Mostek RTC driver.\n");
262
263 return 0;
264}
265
266static void __exit rtc_sun_cleanup(void)
267{
268 misc_deregister(&rtc_dev);
269}
270
271module_init(rtc_sun_init);
272module_exit(rtc_sun_cleanup);
273MODULE_LICENSE("GPL");