time: add weak annotation to timer_read_counter declaration

[karo-tx-uboot.git] / lib / time.c

diff --git a/lib/time.c b/lib/time.c
index 6e2937b8e726d4f2ffc009d91f6f4ff53a432c6f..111b493a420d65c462e70747b5830aa51c45da0e 100644 (file)
--- a/lib/time.c
+++ b/lib/time.c
@@ -2,32 +2,93 @@
  * (C) Copyright 2000-2009
  * 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
+ * SPDX-License-Identifier:    GPL-2.0+
  */
 
 #include <common.h>
 #include <watchdog.h>
+#include <div64.h>
+#include <asm/io.h>
+
+#if CONFIG_SYS_HZ != 1000
+#warning "CONFIG_SYS_HZ must be 1000 and should not be defined by platforms"
+#endif
 
 #ifndef CONFIG_WD_PERIOD
 # define CONFIG_WD_PERIOD      (10 * 1000 * 1000)      /* 10 seconds default*/
 #endif
 
+DECLARE_GLOBAL_DATA_PTR;
+
+#ifdef CONFIG_SYS_TIMER_RATE
+ulong notrace get_tbclk(void)
+{
+       return CONFIG_SYS_TIMER_RATE;
+}
+#endif
+
+#ifdef CONFIG_SYS_TIMER_COUNTER
+unsigned long notrace timer_read_counter(void)
+{
+#ifdef CONFIG_SYS_TIMER_COUNTS_DOWN
+       return ~readl(CONFIG_SYS_TIMER_COUNTER);
+#else
+       return readl(CONFIG_SYS_TIMER_COUNTER);
+#endif
+}
+#else
+extern unsigned long __weak timer_read_counter(void);
+#endif
+
+unsigned long long __weak notrace get_ticks(void)
+{
+       unsigned long now = timer_read_counter();
+
+       /* increment tbu if tbl has rolled over */
+       if (now < gd->timebase_l)
+               gd->timebase_h++;
+       gd->timebase_l = now;
+       return ((unsigned long long)gd->timebase_h << 32) | gd->timebase_l;
+}
+
+static unsigned long long notrace tick_to_time(unsigned long long tick)
+{
+       unsigned int div = get_tbclk();
+
+       tick *= CONFIG_SYS_HZ;
+       do_div(tick, div);
+       return tick;
+}
+
+ulong __weak get_timer(ulong base)
+{
+       return tick_to_time(get_ticks()) - base;
+}
+
+unsigned long __weak notrace timer_get_us(void)
+{
+       return tick_to_time(get_ticks() * 1000);
+}
+static unsigned long long usec_to_tick(unsigned long usec)
+{
+       unsigned long long tick = usec * get_tbclk();
+       usec *= get_tbclk();
+       do_div(tick, 1000000);
+       return tick;
+}
+
+void __weak __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*/;
+}
+
 /* ------------------------------------------------------------------------- */
 
 void udelay(unsigned long usec)