1 files changed, 82 insertions, 0 deletions
diff --git a/cpu/i386/sc520/sc520_timer.c b/cpu/i386/sc520/sc520_timer.c
new file mode 100644
index 0000000..2cb8656
--- /dev/null
+++ b/cpu/i386/sc520/sc520_timer.c
@@ -0,0 +1,82 @@
+/*
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB <daniel@omicron.se>.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/* stuff specific for the sc520, but independent of implementation */
+
+#include <common.h>
+#include <asm/interrupt.h>
+#include <asm/ic/sc520.h>
+
+void sc520_timer_isr(void)
+{
+	/* Ack the GP Timer Interrupt */
+	write_mmcr_byte (SC520_GPTMRSTA, 0x02);
+}
+
+int timer_init(void)
+{
+	/* Map GP Timer 1 to Master PIC IR0  */
+	write_mmcr_byte (SC520_GPTMR1MAP, 0x01);
+
+	/* Disable GP Timers 1 & 2 - Allow configuration writes */
+	write_mmcr_word (SC520_GPTMR1CTL, 0x4000);
+	write_mmcr_word (SC520_GPTMR2CTL, 0x4000);
+
+	/* Reset GP Timers 1 & 2 */
+	write_mmcr_word (SC520_GPTMR1CNT, 0x0000);
+	write_mmcr_word (SC520_GPTMR2CNT, 0x0000);
+
+	/* Setup GP Timer 2 as a 100kHz (10us) prescaler */
+	write_mmcr_word (SC520_GPTMR2MAXCMPA, 83);
+	write_mmcr_word (SC520_GPTMR2CTL, 0xc001);
+
+	/* Setup GP Timer 1 as a 1000 Hz (1ms) interrupt generator */
+	write_mmcr_word (SC520_GPTMR1MAXCMPA, 100);
+	write_mmcr_word (SC520_GPTMR1CTL, 0xe009);
+
+	/* Clear the GP Timers status register */
+	write_mmcr_byte (SC520_GPTMRSTA, 0x07);
+
+	/* Register the SC520 specific timer interrupt handler */
+	register_timer_isr (sc520_timer_isr);
+
+	/* Install interrupt handler for GP Timer 1 */
+	irq_install_handler (0, timer_isr, NULL);
+	unmask_irq (0);
+
+	return 0;
+}
+
+void udelay(unsigned long usec)
+{
+	int m = 0;
+	long u;
+
+	read_mmcr_word (SC520_SWTMRMILLI);
+	read_mmcr_word (SC520_SWTMRMICRO);
+
+	do {
+		m += read_mmcr_word (SC520_SWTMRMILLI);
+		u = read_mmcr_word (SC520_SWTMRMICRO) + (m * 1000);
+	} while (u < usec);
+}