1 // SPDX-License-Identifier: GPL-2.0
3  *	Real Time Clock interface for Linux on the BVME6000
48 	case RTC_RD_TIME:	/* Read the time/date from RTC	*/  in rtc_ioctl()
51 		/* Ensure clock and real-time-mode-register are accessible */  in rtc_ioctl()
52 		msr = rtc->msr & 0xc0;  in rtc_ioctl()
53 		rtc->msr = 0x40;  in rtc_ioctl()
56 			wtime.tm_sec =  bcd2bin(rtc->bcd_sec);  in rtc_ioctl()
57 			wtime.tm_min =  bcd2bin(rtc->bcd_min);  in rtc_ioctl()
58 			wtime.tm_hour = bcd2bin(rtc->bcd_hr);  in rtc_ioctl()
59 			wtime.tm_mday =  bcd2bin(rtc->bcd_dom);  in rtc_ioctl()
60 			wtime.tm_mon =  bcd2bin(rtc->bcd_mth)-1;  in rtc_ioctl()
61 			wtime.tm_year = bcd2bin(rtc->bcd_year);  in rtc_ioctl()
64 			wtime.tm_wday = bcd2bin(rtc->bcd_dow)-1;  in rtc_ioctl()
65 		} while (wtime.tm_sec != bcd2bin(rtc->bcd_sec));  in rtc_ioctl()
66 		rtc->msr = msr;  in rtc_ioctl()
69 								-EFAULT : 0;  in rtc_ioctl()
78 			return -EACCES;  in rtc_ioctl()
81 			return -EFAULT;  in rtc_ioctl()
95 			return -EINVAL;  in rtc_ioctl()
98 			return -EINVAL;  in rtc_ioctl()
101 			return -EINVAL;  in rtc_ioctl()
104 			return -EINVAL;  in rtc_ioctl()
107 		/* Ensure clock and real-time-mode-register are accessible */  in rtc_ioctl()
108 		msr = rtc->msr & 0xc0;  in rtc_ioctl()
109 		rtc->msr = 0x40;  in rtc_ioctl()
111 		rtc->t0cr_rtmr = yrs%4;  in rtc_ioctl()
112 		rtc->bcd_tenms = 0;  in rtc_ioctl()
113 		rtc->bcd_sec   = bin2bcd(sec);  in rtc_ioctl()
114 		rtc->bcd_min   = bin2bcd(min);  in rtc_ioctl()
115 		rtc->bcd_hr    = bin2bcd(hrs);  in rtc_ioctl()
116 		rtc->bcd_dom   = bin2bcd(day);  in rtc_ioctl()
117 		rtc->bcd_mth   = bin2bcd(mon);  in rtc_ioctl()
118 		rtc->bcd_year  = bin2bcd(yrs%100);  in rtc_ioctl()
120 			rtc->bcd_dow = bin2bcd(rtc_tm.tm_wday+1);  in rtc_ioctl()
121 		rtc->t0cr_rtmr = yrs%4 | 0x08;  in rtc_ioctl()
123 		rtc->msr = msr;  in rtc_ioctl()
128 		return -EINVAL;  in rtc_ioctl()
133  * We enforce only one user at a time here with the open/close.
139 		return -EBUSY;  in rtc_open()
170 		return -ENODEV;  in rtc_DP8570A_init()
172 	pr_info("DP8570A Real Time Clock Driver v%s\n", RTC_VERSION);  in rtc_DP8570A_init()