Factor out SC520 sub-features

[u-boot] / cpu / i386 / sc520 / sc520_timer.c

diff --git a/cpu/i386/sc520/sc520_timer.c b/cpu/i386/sc520/sc520_timer.c
new file mode 100644 (file)
index 0000000..7578511
--- /dev/null
+++ b/cpu/i386/sc520/sc520_timer.c
@@ -0,0 +1,73 @@
+/*
+ * (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 reset_timer(void)
+{
+       write_mmcr_word(SC520_GPTMR0CNT, 0);
+       write_mmcr_word(SC520_GPTMR0CTL, 0x6001);
+
+}
+
+ulong get_timer(ulong base)
+{
+       /* fixme: 30 or 33 */
+       return  read_mmcr_word(SC520_GPTMR0CNT) / 33;
+}
+
+void set_timer(ulong t)
+{
+       /* FixMe: use two cascade coupled timers */
+       write_mmcr_word(SC520_GPTMR0CTL, 0x4001);
+       write_mmcr_word(SC520_GPTMR0CNT, t*33);
+       write_mmcr_word(SC520_GPTMR0CTL, 0x6001);
+}
+
+
+void udelay(unsigned long usec)
+{
+       int m=0;
+       long u;
+
+       read_mmcr_word(SC520_SWTMRMILLI);
+       read_mmcr_word(SC520_SWTMRMICRO);
+
+#if 0
+       /* do not enable this line, udelay is used in the serial driver -> recursion */
+       printf("udelay: %ld m.u %d.%d  tm.tu %d.%d\n", usec, m, u, tm, tu);
+#endif
+       while (1) {
+
+               m += read_mmcr_word(SC520_SWTMRMILLI);
+               u = read_mmcr_word(SC520_SWTMRMICRO) + (m * 1000);
+
+               if (usec <= u) {
+                       break;
+               }
+       }
+}