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-rw-r--r--arch/sh/lib/time.c141
1 files changed, 141 insertions, 0 deletions
diff --git a/arch/sh/lib/time.c b/arch/sh/lib/time.c
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+/*
+ * (C) Copyright 2009
+ * Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
+ *
+ * (C) Copyright 2007-2008
+ * Nobobuhiro Iwamatsu <iwamatsu@nigauri.org>
+ *
+ * (C) Copyright 2003
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * 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
+ */
+
+#include <common.h>
+#include <div64.h>
+#include <asm/processor.h>
+#include <asm/clk.h>
+#include <asm/io.h>
+
+#define TMU_MAX_COUNTER (~0UL)
+
+static ulong timer_freq;
+
+static inline unsigned long long tick_to_time(unsigned long long tick)
+{
+ tick *= CONFIG_SYS_HZ;
+ do_div(tick, timer_freq);
+
+ return tick;
+}
+
+static inline unsigned long long usec_to_tick(unsigned long long usec)
+{
+ usec *= timer_freq;
+ do_div(usec, 1000000);
+
+ return usec;
+}
+
+static void tmu_timer_start (unsigned int timer)
+{
+ if (timer > 2)
+ return;
+ writeb(readb(TSTR) | (1 << timer), TSTR);
+}
+
+static void tmu_timer_stop (unsigned int timer)
+{
+ if (timer > 2)
+ return;
+ writeb(readb(TSTR) & ~(1 << timer), TSTR);
+}
+
+int timer_init (void)
+{
+ /* Divide clock by CONFIG_SYS_TMU_CLK_DIV */
+ u16 bit = 0;
+
+ switch (CONFIG_SYS_TMU_CLK_DIV) {
+ case 1024:
+ bit = 4;
+ break;
+ case 256:
+ bit = 3;
+ break;
+ case 64:
+ bit = 2;
+ break;
+ case 16:
+ bit = 1;
+ break;
+ case 4:
+ default:
+ break;
+ }
+ writew(readw(TCR0) | bit, TCR0);
+
+ /* Calc clock rate */
+ timer_freq = get_tmu0_clk_rate() >> ((bit + 1) * 2);
+
+ tmu_timer_stop(0);
+ tmu_timer_start(0);
+
+ return 0;
+}
+
+unsigned long long get_ticks (void)
+{
+ return 0 - readl(TCNT0);
+}
+
+void __udelay (unsigned long usec)
+{
+ unsigned long long tmp;
+ ulong tmo;
+
+ tmo = usec_to_tick(usec);
+ tmp = get_ticks() + tmo; /* get current timestamp */
+
+ while (get_ticks() < tmp) /* loop till event */
+ /*NOP*/;
+}
+
+unsigned long get_timer (unsigned long base)
+{
+ /* return msec */
+ return tick_to_time(get_ticks()) - base;
+}
+
+void set_timer (unsigned long t)
+{
+ writel((0 - t), TCNT0);
+}
+
+void reset_timer (void)
+{
+ tmu_timer_stop(0);
+ set_timer (0);
+ tmu_timer_start(0);
+}
+
+unsigned long get_tbclk (void)
+{
+ return timer_freq;
+}