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linux-7.2.3/arch/m68k/bvme6000/Makefile

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+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for Linux arch/m68k/bvme6000 source directory
+#
+
+obj-y		:= config.o rtc.o

linux-7.2.3/arch/m68k/bvme6000/config.c

@@ -0,0 +1,322 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  arch/m68k/bvme6000/config.c
+ *
+ *  Copyright (C) 1997 Richard Hirst [richard@sleepie.demon.co.uk]
+ *
+ * Based on:
+ *
+ *  linux/amiga/config.c
+ *
+ *  Copyright (C) 1993 Hamish Macdonald
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/tty.h>
+#include <linux/clocksource.h>
+#include <linux/console.h>
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <linux/major.h>
+#include <linux/rtc.h>
+#include <linux/interrupt.h>
+#include <linux/bcd.h>
+
+#include <asm/bootinfo.h>
+#include <asm/bootinfo-vme.h>
+#include <asm/byteorder.h>
+#include <asm/setup.h>
+#include <asm/irq.h>
+#include <asm/traps.h>
+#include <asm/machdep.h>
+#include <asm/bvme6000hw.h>
+#include <asm/config.h>
+
+static void bvme6000_get_model(char *model);
+extern void bvme6000_sched_init(void);
+extern int bvme6000_hwclk (int, struct rtc_time *);
+extern void bvme6000_reset (void);
+void bvme6000_set_vectors (void);
+
+
+int __init bvme6000_parse_bootinfo(const struct bi_record *bi)
+{
+	if (be16_to_cpu(bi->tag) == BI_VME_TYPE)
+		return 0;
+	else
+		return 1;
+}
+
+void bvme6000_reset(void)
+{
+	volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
+
+	pr_info("\r\n\nCalled bvme6000_reset\r\n"
+		"\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r");
+	/* The string of returns is to delay the reset until the whole
+	 * message is output. */
+	/* Enable the watchdog, via PIT port C bit 4 */
+
+	pit->pcddr	|= 0x10;	/* WDOG enable */
+
+	while(1)
+		;
+}
+
+static void bvme6000_get_model(char *model)
+{
+    sprintf(model, "BVME%d000", m68k_cputype == CPU_68060 ? 6 : 4);
+}
+
+/*
+ * This function is called during kernel startup to initialize
+ * the bvme6000 IRQ handling routines.
+ */
+static void __init bvme6000_init_IRQ(void)
+{
+	m68k_setup_user_interrupt(VEC_USER, 192);
+}
+
+void __init config_bvme6000(void)
+{
+    volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
+
+    /* Board type is only set by newer versions of vmelilo/tftplilo */
+    if (!vme_brdtype) {
+	if (m68k_cputype == CPU_68060)
+	    vme_brdtype = VME_TYPE_BVME6000;
+	else
+	    vme_brdtype = VME_TYPE_BVME4000;
+    }
+#if 0
+    /* Call bvme6000_set_vectors() so ABORT will work, along with BVMBug
+     * debugger.  Note trap_init() will splat the abort vector, but
+     * bvme6000_init_IRQ() will put it back again.  Hopefully. */
+
+    bvme6000_set_vectors();
+#endif
+
+    mach_sched_init      = bvme6000_sched_init;
+    mach_init_IRQ        = bvme6000_init_IRQ;
+    mach_hwclk           = bvme6000_hwclk;
+    mach_reset		 = bvme6000_reset;
+    mach_get_model       = bvme6000_get_model;
+
+    pr_info("Board is %sconfigured as a System Controller\n",
+	    *config_reg_ptr & BVME_CONFIG_SW1 ? "" : "not ");
+
+    /* Now do the PIT configuration */
+
+    pit->pgcr	= 0x00;	/* Unidirectional 8 bit, no handshake for now */
+    pit->psrr	= 0x18;	/* PIACK and PIRQ functions enabled */
+    pit->pacr	= 0x00;	/* Sub Mode 00, H2 i/p, no DMA */
+    pit->padr	= 0x00;	/* Just to be tidy! */
+    pit->paddr	= 0x00;	/* All inputs for now (safest) */
+    pit->pbcr	= 0x80;	/* Sub Mode 1x, H4 i/p, no DMA */
+    pit->pbdr	= 0xbc | (*config_reg_ptr & BVME_CONFIG_SW1 ? 0 : 0x40);
+			/* PRI, SYSCON?, Level3, SCC clks from xtal */
+    pit->pbddr	= 0xf3;	/* Mostly outputs */
+    pit->pcdr	= 0x01;	/* PA transceiver disabled */
+    pit->pcddr	= 0x03;	/* WDOG disable */
+
+    /* Disable snooping for Ethernet and VME accesses */
+
+    bvme_acr_addrctl = 0;
+}
+
+
+static irqreturn_t bvme6000_abort_int(int irq, void *dev_id)
+{
+        unsigned long *new = (unsigned long *)vectors;
+        unsigned long *old = (unsigned long *)0xf8000000;
+
+        /* Wait for button release */
+        while (*(volatile unsigned char *)BVME_LOCAL_IRQ_STAT & BVME_ABORT_STATUS)
+                ;
+
+        *(new+4) = *(old+4);            /* Illegal instruction */
+        *(new+9) = *(old+9);            /* Trace */
+        *(new+47) = *(old+47);          /* Trap #15 */
+        *(new+0x1f) = *(old+0x1f);      /* ABORT switch */
+	return IRQ_HANDLED;
+}
+
+static u64 bvme6000_read_clk(struct clocksource *cs);
+
+static struct clocksource bvme6000_clk = {
+	.name   = "rtc",
+	.rating = 250,
+	.read   = bvme6000_read_clk,
+	.mask   = CLOCKSOURCE_MASK(32),
+	.flags  = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static u32 clk_total, clk_offset;
+
+#define RTC_TIMER_CLOCK_FREQ 8000000
+#define RTC_TIMER_CYCLES     (RTC_TIMER_CLOCK_FREQ / HZ)
+#define RTC_TIMER_COUNT      ((RTC_TIMER_CYCLES / 2) - 1)
+
+static irqreturn_t bvme6000_timer_int (int irq, void *dev_id)
+{
+    unsigned long flags;
+    volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
+    unsigned char msr;
+
+    local_irq_save(flags);
+    msr = rtc->msr & 0xc0;
+    rtc->msr = msr | 0x20;		/* Ack the interrupt */
+    clk_total += RTC_TIMER_CYCLES;
+    clk_offset = 0;
+    legacy_timer_tick(1);
+    local_irq_restore(flags);
+
+    return IRQ_HANDLED;
+}
+
+/*
+ * Set up the RTC timer 1 to mode 2, so T1 output toggles every 5ms
+ * (40000 x 125ns).  It will interrupt every 10ms, when T1 goes low.
+ * So, when reading the elapsed time, you should read timer1,
+ * subtract it from 39999, and then add 40000 if T1 is high.
+ * That gives you the number of 125ns ticks in to the 10ms period,
+ * so divide by 8 to get the microsecond result.
+ */
+
+void bvme6000_sched_init (void)
+{
+    volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
+    unsigned char msr = rtc->msr & 0xc0;
+
+    rtc->msr = 0;	/* Ensure timer registers accessible */
+
+    if (request_irq(BVME_IRQ_RTC, bvme6000_timer_int, IRQF_TIMER, "timer",
+                    NULL))
+	panic ("Couldn't register timer int");
+
+    rtc->t1cr_omr = 0x04;	/* Mode 2, ext clk */
+    rtc->t1msb = RTC_TIMER_COUNT >> 8;
+    rtc->t1lsb = RTC_TIMER_COUNT & 0xff;
+    rtc->irr_icr1 &= 0xef;	/* Route timer 1 to INTR pin */
+    rtc->msr = 0x40;		/* Access int.cntrl, etc */
+    rtc->pfr_icr0 = 0x80;	/* Just timer 1 ints enabled */
+    rtc->irr_icr1 = 0;
+    rtc->t1cr_omr = 0x0a;	/* INTR+T1 active lo, push-pull */
+    rtc->t0cr_rtmr &= 0xdf;	/* Stop timers in standby */
+    rtc->msr = 0;		/* Access timer 1 control */
+    rtc->t1cr_omr = 0x05;	/* Mode 2, ext clk, GO */
+
+    rtc->msr = msr;
+
+    clocksource_register_hz(&bvme6000_clk, RTC_TIMER_CLOCK_FREQ);
+
+    if (request_irq(BVME_IRQ_ABORT, bvme6000_abort_int, 0,
+				"abort", bvme6000_abort_int))
+	panic ("Couldn't register abort int");
+}
+
+
+/*
+ * NOTE:  Don't accept any readings within 5us of rollover, as
+ * the T1INT bit may be a little slow getting set.  There is also
+ * a fault in the chip, meaning that reads may produce invalid
+ * results...
+ */
+
+static u64 bvme6000_read_clk(struct clocksource *cs)
+{
+    unsigned long flags;
+    volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
+    volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
+    unsigned char msr, msb;
+    unsigned char t1int, t1op;
+    u32 v = 800000, ov;
+
+    local_irq_save(flags);
+
+    msr = rtc->msr & 0xc0;
+    rtc->msr = 0;	/* Ensure timer registers accessible */
+
+    do {
+	ov = v;
+	t1int = rtc->msr & 0x20;
+	t1op  = pit->pcdr & 0x04;
+	rtc->t1cr_omr |= 0x40;		/* Latch timer1 */
+	msb = rtc->t1msb;		/* Read timer1 */
+	v = (msb << 8) | rtc->t1lsb;	/* Read timer1 */
+    } while (t1int != (rtc->msr & 0x20) ||
+		t1op != (pit->pcdr & 0x04) ||
+			abs(ov-v) > 80 ||
+				v > RTC_TIMER_COUNT - (RTC_TIMER_COUNT / 100));
+
+    v = RTC_TIMER_COUNT - v;
+    if (!t1op)				/* If in second half cycle.. */
+	v += RTC_TIMER_CYCLES / 2;
+    if (msb > 0 && t1int)
+	clk_offset = RTC_TIMER_CYCLES;
+    rtc->msr = msr;
+
+    v += clk_offset + clk_total;
+
+    local_irq_restore(flags);
+
+    return v;
+}
+
+/*
+ * Looks like op is non-zero for setting the clock, and zero for
+ * reading the clock.
+ *
+ *  struct hwclk_time {
+ *         unsigned        sec;       0..59
+ *         unsigned        min;       0..59
+ *         unsigned        hour;      0..23
+ *         unsigned        day;       1..31
+ *         unsigned        mon;       0..11
+ *         unsigned        year;      00...
+ *         int             wday;      0..6, 0 is Sunday, -1 means unknown/don't set
+ * };
+ */
+
+int bvme6000_hwclk(int op, struct rtc_time *t)
+{
+	volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
+	unsigned char msr = rtc->msr & 0xc0;
+
+	rtc->msr = 0x40;	/* Ensure clock and real-time-mode-register
+				 * are accessible */
+	if (op)
+	{	/* Write.... */
+		rtc->t0cr_rtmr = t->tm_year%4;
+		rtc->bcd_tenms = 0;
+		rtc->bcd_sec = bin2bcd(t->tm_sec);
+		rtc->bcd_min = bin2bcd(t->tm_min);
+		rtc->bcd_hr  = bin2bcd(t->tm_hour);
+		rtc->bcd_dom = bin2bcd(t->tm_mday);
+		rtc->bcd_mth = bin2bcd(t->tm_mon + 1);
+		rtc->bcd_year = bin2bcd(t->tm_year%100);
+		if (t->tm_wday >= 0)
+			rtc->bcd_dow = bin2bcd(t->tm_wday+1);
+		rtc->t0cr_rtmr = t->tm_year%4 | 0x08;
+	}
+	else
+	{	/* Read....  */
+		do {
+			t->tm_sec  = bcd2bin(rtc->bcd_sec);
+			t->tm_min  = bcd2bin(rtc->bcd_min);
+			t->tm_hour = bcd2bin(rtc->bcd_hr);
+			t->tm_mday = bcd2bin(rtc->bcd_dom);
+			t->tm_mon  = bcd2bin(rtc->bcd_mth)-1;
+			t->tm_year = bcd2bin(rtc->bcd_year);
+			if (t->tm_year < 70)
+				t->tm_year += 100;
+			t->tm_wday = bcd2bin(rtc->bcd_dow)-1;
+		} while (t->tm_sec != bcd2bin(rtc->bcd_sec));
+	}
+
+	rtc->msr = msr;
+
+	return 0;
+}

linux-7.2.3/arch/m68k/bvme6000/rtc.c

@@ -0,0 +1,175 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *	Real Time Clock interface for Linux on the BVME6000
+ *
+ * Based on the PC driver by Paul Gortmaker.
+ */
+
+#define RTC_VERSION		"1.00"
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/miscdevice.h>
+#include <linux/ioport.h>
+#include <linux/capability.h>
+#include <linux/fcntl.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <linux/module.h>
+#include <linux/rtc.h>	/* For struct rtc_time and ioctls, etc */
+#include <linux/bcd.h>
+#include <asm/bvme6000hw.h>
+
+#include <asm/io.h>
+#include <linux/uaccess.h>
+#include <asm/setup.h>
+
+/*
+ *	We sponge a minor off of the misc major. No need slurping
+ *	up another valuable major dev number for this. If you add
+ *	an ioctl, make sure you don't conflict with SPARC's RTC
+ *	ioctls.
+ */
+
+static unsigned char days_in_mo[] =
+{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+
+static atomic_t rtc_status = ATOMIC_INIT(1);
+
+static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
+	unsigned char msr;
+	unsigned long flags;
+	struct rtc_time wtime;
+	void __user *argp = (void __user *)arg;
+
+	switch (cmd) {
+	case RTC_RD_TIME:	/* Read the time/date from RTC	*/
+	{
+		local_irq_save(flags);
+		/* Ensure clock and real-time-mode-register are accessible */
+		msr = rtc->msr & 0xc0;
+		rtc->msr = 0x40;
+		memset(&wtime, 0, sizeof(struct rtc_time));
+		do {
+			wtime.tm_sec =  bcd2bin(rtc->bcd_sec);
+			wtime.tm_min =  bcd2bin(rtc->bcd_min);
+			wtime.tm_hour = bcd2bin(rtc->bcd_hr);
+			wtime.tm_mday =  bcd2bin(rtc->bcd_dom);
+			wtime.tm_mon =  bcd2bin(rtc->bcd_mth)-1;
+			wtime.tm_year = bcd2bin(rtc->bcd_year);
+			if (wtime.tm_year < 70)
+				wtime.tm_year += 100;
+			wtime.tm_wday = bcd2bin(rtc->bcd_dow)-1;
+		} while (wtime.tm_sec != bcd2bin(rtc->bcd_sec));
+		rtc->msr = msr;
+		local_irq_restore(flags);
+		return copy_to_user(argp, &wtime, sizeof wtime) ?
+								-EFAULT : 0;
+	}
+	case RTC_SET_TIME:	/* Set the RTC */
+	{
+		struct rtc_time rtc_tm;
+		unsigned char mon, day, hrs, min, sec, leap_yr;
+		unsigned int yrs;
+
+		if (!capable(CAP_SYS_ADMIN))
+			return -EACCES;
+
+		if (copy_from_user(&rtc_tm, argp, sizeof(struct rtc_time)))
+			return -EFAULT;
+
+		yrs = rtc_tm.tm_year;
+		if (yrs < 1900)
+			yrs += 1900;
+		mon = rtc_tm.tm_mon + 1;   /* tm_mon starts at zero */
+		day = rtc_tm.tm_mday;
+		hrs = rtc_tm.tm_hour;
+		min = rtc_tm.tm_min;
+		sec = rtc_tm.tm_sec;
+
+		leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400));
+
+		if ((mon > 12) || (mon < 1) || (day == 0))
+			return -EINVAL;
+
+		if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
+			return -EINVAL;
+
+		if ((hrs >= 24) || (min >= 60) || (sec >= 60))
+			return -EINVAL;
+
+		if (yrs >= 2070)
+			return -EINVAL;
+
+		local_irq_save(flags);
+		/* Ensure clock and real-time-mode-register are accessible */
+		msr = rtc->msr & 0xc0;
+		rtc->msr = 0x40;
+
+		rtc->t0cr_rtmr = yrs%4;
+		rtc->bcd_tenms = 0;
+		rtc->bcd_sec   = bin2bcd(sec);
+		rtc->bcd_min   = bin2bcd(min);
+		rtc->bcd_hr    = bin2bcd(hrs);
+		rtc->bcd_dom   = bin2bcd(day);
+		rtc->bcd_mth   = bin2bcd(mon);
+		rtc->bcd_year  = bin2bcd(yrs%100);
+		if (rtc_tm.tm_wday >= 0)
+			rtc->bcd_dow = bin2bcd(rtc_tm.tm_wday+1);
+		rtc->t0cr_rtmr = yrs%4 | 0x08;
+
+		rtc->msr = msr;
+		local_irq_restore(flags);
+		return 0;
+	}
+	default:
+		return -EINVAL;
+	}
+}
+
+/*
+ * We enforce only one user at a time here with the open/close.
+ */
+static int rtc_open(struct inode *inode, struct file *file)
+{
+	if (!atomic_dec_and_test(&rtc_status)) {
+		atomic_inc(&rtc_status);
+		return -EBUSY;
+	}
+	return 0;
+}
+
+static int rtc_release(struct inode *inode, struct file *file)
+{
+	atomic_inc(&rtc_status);
+	return 0;
+}
+
+/*
+ *	The various file operations we support.
+ */
+
+static const struct file_operations rtc_fops = {
+	.unlocked_ioctl	= rtc_ioctl,
+	.open		= rtc_open,
+	.release	= rtc_release,
+	.llseek		= noop_llseek,
+};
+
+static struct miscdevice rtc_dev = {
+	.minor =	RTC_MINOR,
+	.name =		"rtc",
+	.fops =		&rtc_fops
+};
+
+static int __init rtc_DP8570A_init(void)
+{
+	if (!MACH_IS_BVME6000)
+		return -ENODEV;
+
+	pr_info("DP8570A Real Time Clock Driver v%s\n", RTC_VERSION);
+	return misc_register(&rtc_dev);
+}
+module_init(rtc_DP8570A_init);