^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 BVME6000
^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/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/rtc.h> /* For struct rtc_time and ioctls, etc */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/bcd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <asm/bvme6000hw.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <asm/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <asm/setup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * We sponge a minor off of the misc major. No need slurping
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * up another valuable major dev number for this. If you add
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * an ioctl, make sure you don't conflict with SPARC's RTC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * ioctls.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) static unsigned char days_in_mo[] =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static atomic_t rtc_status = ATOMIC_INIT(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) unsigned char msr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct rtc_time wtime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) void __user *argp = (void __user *)arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) case RTC_RD_TIME: /* Read the time/date from RTC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) local_irq_save(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) /* Ensure clock and real-time-mode-register are accessible */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) msr = rtc->msr & 0xc0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) rtc->msr = 0x40;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) memset(&wtime, 0, sizeof(struct rtc_time));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) wtime.tm_sec = bcd2bin(rtc->bcd_sec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) wtime.tm_min = bcd2bin(rtc->bcd_min);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) wtime.tm_hour = bcd2bin(rtc->bcd_hr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) wtime.tm_mday = bcd2bin(rtc->bcd_dom);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) wtime.tm_mon = bcd2bin(rtc->bcd_mth)-1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) wtime.tm_year = bcd2bin(rtc->bcd_year);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) if (wtime.tm_year < 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) wtime.tm_year += 100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) wtime.tm_wday = bcd2bin(rtc->bcd_dow)-1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) } while (wtime.tm_sec != bcd2bin(rtc->bcd_sec));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) rtc->msr = msr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) local_irq_restore(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) return copy_to_user(argp, &wtime, sizeof wtime) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) -EFAULT : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) case RTC_SET_TIME: /* Set the RTC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct rtc_time rtc_tm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) unsigned char mon, day, hrs, min, sec, leap_yr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) unsigned int yrs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) if (copy_from_user(&rtc_tm, argp, sizeof(struct rtc_time)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) yrs = rtc_tm.tm_year;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (yrs < 1900)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) yrs += 1900;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) mon = rtc_tm.tm_mon + 1; /* tm_mon starts at zero */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) day = rtc_tm.tm_mday;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) hrs = rtc_tm.tm_hour;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) min = rtc_tm.tm_min;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) sec = rtc_tm.tm_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) if ((mon > 12) || (mon < 1) || (day == 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) if ((hrs >= 24) || (min >= 60) || (sec >= 60))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (yrs >= 2070)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) local_irq_save(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) /* Ensure clock and real-time-mode-register are accessible */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) msr = rtc->msr & 0xc0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) rtc->msr = 0x40;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) rtc->t0cr_rtmr = yrs%4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) rtc->bcd_tenms = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) rtc->bcd_sec = bin2bcd(sec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) rtc->bcd_min = bin2bcd(min);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) rtc->bcd_hr = bin2bcd(hrs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) rtc->bcd_dom = bin2bcd(day);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) rtc->bcd_mth = bin2bcd(mon);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) rtc->bcd_year = bin2bcd(yrs%100);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (rtc_tm.tm_wday >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) rtc->bcd_dow = bin2bcd(rtc_tm.tm_wday+1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) rtc->t0cr_rtmr = yrs%4 | 0x08;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) rtc->msr = msr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) local_irq_restore(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^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) * We enforce only one user at a time here with the open/close.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) static int rtc_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) if (!atomic_dec_and_test(&rtc_status)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) atomic_inc(&rtc_status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) static int rtc_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) atomic_inc(&rtc_status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) return 0;
^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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) * The various file operations we support.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) static const struct file_operations rtc_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) .unlocked_ioctl = rtc_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) .open = rtc_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) .release = rtc_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) .llseek = noop_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) static struct miscdevice rtc_dev = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) .minor = RTC_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) .name = "rtc",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) .fops = &rtc_fops
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) static int __init rtc_DP8570A_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) if (!MACH_IS_BVME6000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) pr_info("DP8570A Real Time Clock Driver v%s\n", RTC_VERSION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) return misc_register(&rtc_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) module_init(rtc_DP8570A_init);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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