From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:49:45 +0200
Subject: Adding upstream version 6.1.76.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 arch/m68k/sun3x/time.c | 103 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 arch/m68k/sun3x/time.c

(limited to 'arch/m68k/sun3x/time.c')

diff --git a/arch/m68k/sun3x/time.c b/arch/m68k/sun3x/time.c
new file mode 100644
index 000000000..a2c97821f
--- /dev/null
+++ b/arch/m68k/sun3x/time.c
@@ -0,0 +1,103 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  linux/arch/m68k/sun3x/time.c
+ *
+ *  Sun3x-specific time handling
+ */
+
+#include <linux/types.h>
+#include <linux/kd.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/kernel_stat.h>
+#include <linux/interrupt.h>
+#include <linux/rtc.h>
+#include <linux/bcd.h>
+
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/machdep.h>
+#include <asm/traps.h>
+#include <asm/sun3x.h>
+#include <asm/sun3ints.h>
+
+#include "time.h"
+
+#define M_CONTROL 0xf8
+#define M_SEC     0xf9
+#define M_MIN     0xfa
+#define M_HOUR    0xfb
+#define M_DAY     0xfc
+#define M_DATE    0xfd
+#define M_MONTH   0xfe
+#define M_YEAR    0xff
+
+#define C_WRITE   0x80
+#define C_READ    0x40
+#define C_SIGN    0x20
+#define C_CALIB   0x1f
+
+int sun3x_hwclk(int set, struct rtc_time *t)
+{
+	volatile struct mostek_dt *h =
+		(struct mostek_dt *)(SUN3X_EEPROM+M_CONTROL);
+	unsigned long flags;
+
+	local_irq_save(flags);
+
+	if(set) {
+		h->csr |= C_WRITE;
+		h->sec = bin2bcd(t->tm_sec);
+		h->min = bin2bcd(t->tm_min);
+		h->hour = bin2bcd(t->tm_hour);
+		h->wday = bin2bcd(t->tm_wday);
+		h->mday = bin2bcd(t->tm_mday);
+		h->month = bin2bcd(t->tm_mon + 1);
+		h->year = bin2bcd(t->tm_year % 100);
+		h->csr &= ~C_WRITE;
+	} else {
+		h->csr |= C_READ;
+		t->tm_sec = bcd2bin(h->sec);
+		t->tm_min = bcd2bin(h->min);
+		t->tm_hour = bcd2bin(h->hour);
+		t->tm_wday = bcd2bin(h->wday);
+		t->tm_mday = bcd2bin(h->mday);
+		t->tm_mon = bcd2bin(h->month) - 1;
+		t->tm_year = bcd2bin(h->year);
+		h->csr &= ~C_READ;
+		if (t->tm_year < 70)
+			t->tm_year += 100;
+	}
+
+	local_irq_restore(flags);
+
+	return 0;
+}
+
+#if 0
+static irqreturn_t sun3x_timer_tick(int irq, void *dev_id)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	/* Clear the pending interrupt - pulse the enable line low */
+	disable_irq(5);
+	enable_irq(5);
+	legacy_timer_tick(1);
+	local_irq_restore(flags);
+
+	return IRQ_HANDLED;
+}
+#endif
+
+void __init sun3x_sched_init(void)
+{
+
+	sun3_disable_interrupts();
+
+
+    /* Pulse enable low to get the clock started */
+	sun3_disable_irq(5);
+	sun3_enable_irq(5);
+	sun3_enable_interrupts();
+}
-- 
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