Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *	Real Time Clock interface for Linux on the MVME16x
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Based on the PC driver by Paul Gortmaker.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #define RTC_VERSION		"1.00"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/miscdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/ioport.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/capability.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/poll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/rtc.h>	/* For struct rtc_time and ioctls, etc */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/bcd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <asm/mvme16xhw.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <asm/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <asm/setup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27)  *	We sponge a minor off of the misc major. No need slurping
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28)  *	up another valuable major dev number for this. If you add
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29)  *	an ioctl, make sure you don't conflict with SPARC's RTC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30)  *	ioctls.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) static const unsigned char days_in_mo[] =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) static atomic_t rtc_ready = ATOMIC_INIT(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	volatile MK48T08ptr_t rtc = (MK48T08ptr_t)MVME_RTC_BASE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	struct rtc_time wtime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	void __user *argp = (void __user *)arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	case RTC_RD_TIME:	/* Read the time/date from RTC	*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		local_irq_save(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		/* Ensure clock and real-time-mode-register are accessible */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 		rtc->ctrl = RTC_READ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		memset(&wtime, 0, sizeof(struct rtc_time));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		wtime.tm_sec =  bcd2bin(rtc->bcd_sec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		wtime.tm_min =  bcd2bin(rtc->bcd_min);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 		wtime.tm_hour = bcd2bin(rtc->bcd_hr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 		wtime.tm_mday =  bcd2bin(rtc->bcd_dom);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		wtime.tm_mon =  bcd2bin(rtc->bcd_mth)-1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		wtime.tm_year = bcd2bin(rtc->bcd_year);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		if (wtime.tm_year < 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 			wtime.tm_year += 100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		wtime.tm_wday = bcd2bin(rtc->bcd_dow)-1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		rtc->ctrl = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		local_irq_restore(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		return copy_to_user(argp, &wtime, sizeof wtime) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 								-EFAULT : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	case RTC_SET_TIME:	/* Set the RTC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		struct rtc_time rtc_tm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		unsigned char mon, day, hrs, min, sec, leap_yr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		unsigned int yrs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 			return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		if (copy_from_user(&rtc_tm, argp, sizeof(struct rtc_time)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 			return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		yrs = rtc_tm.tm_year;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		if (yrs < 1900)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 			yrs += 1900;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		mon = rtc_tm.tm_mon + 1;   /* tm_mon starts at zero */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		day = rtc_tm.tm_mday;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		hrs = rtc_tm.tm_hour;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		min = rtc_tm.tm_min;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		sec = rtc_tm.tm_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		if ((mon > 12) || (day == 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		if ((hrs >= 24) || (min >= 60) || (sec >= 60))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		if (yrs >= 2070)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		local_irq_save(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		rtc->ctrl     = RTC_WRITE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		rtc->bcd_sec  = bin2bcd(sec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		rtc->bcd_min  = bin2bcd(min);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		rtc->bcd_hr   = bin2bcd(hrs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		rtc->bcd_dom  = bin2bcd(day);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		rtc->bcd_mth  = bin2bcd(mon);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		rtc->bcd_year = bin2bcd(yrs%100);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		rtc->ctrl     = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		local_irq_restore(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)  * We enforce only one user at a time here with the open/close.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static int rtc_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	if( !atomic_dec_and_test(&rtc_ready) )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		atomic_inc( &rtc_ready );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) static int rtc_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	atomic_inc( &rtc_ready );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)  *	The various file operations we support.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) static const struct file_operations rtc_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	.unlocked_ioctl	= rtc_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	.open		= rtc_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	.release	= rtc_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	.llseek		= noop_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) static struct miscdevice rtc_dev=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	.minor =	RTC_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	.name =		"rtc",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	.fops =		&rtc_fops
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static int __init rtc_MK48T08_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	if (!MACH_IS_MVME16x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	pr_info("MK48T08 Real Time Clock Driver v%s\n", RTC_VERSION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	return misc_register(&rtc_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) device_initcall(rtc_MK48T08_init);