[U-Boot] [PATCH 1/2] arm: a320 timer: move static data to global_data struct

[ratbert.chuang at gmail.com <ratbert.chuang@gmail.com>]

From: Po-Yu Chuang <ratbert@faraday-tech.com>

timer.c used static data and are called before relocation.
Move all static variables into global_data structure. Also cleanup
timer.c from unused stubs and make it truly use 64 bit tick values.

Based on Reinhard Meyer <u-boot@emk-elektronik.de>'s patch
5dca710a3d7703e41da0e9894f2d71f9e25bea6b

Signed-off-by: Po-Yu Chuang <ratbert@faraday-tech.com>
---
 arch/arm/cpu/arm920t/a320/timer.c  |  137 ++++++++++++++----------------------
 arch/arm/include/asm/global_data.h |    5 ++
 board/faraday/a320evb/config.mk    |   35 ---------
 include/configs/a320evb.h          |    2 +
 4 files changed, 59 insertions(+), 120 deletions(-)
 delete mode 100644 board/faraday/a320evb/config.mk

diff --git a/arch/arm/cpu/arm920t/a320/timer.c b/arch/arm/cpu/arm920t/a320/timer.c
index d2e316f..ac48328 100644
--- a/arch/arm/cpu/arm920t/a320/timer.c
+++ b/arch/arm/cpu/arm920t/a320/timer.c
@@ -18,10 +18,13 @@
  */
 
 #include <common.h>
+#include <div64.h>
 #include <asm/io.h>
 #include <asm/arch/ftpmu010.h>
 #include <asm/arch/fttmr010.h>
 
+DECLARE_GLOBAL_DATA_PTR;
+
 static ulong timestamp;
 static ulong lastdec;
 
@@ -31,6 +34,22 @@ static struct ftpmu010 *pmu = (struct ftpmu010 *)CONFIG_FTPMU010_BASE;
 #define TIMER_CLOCK	32768
 #define TIMER_LOAD_VAL	0xffffffff
 
+static inline unsigned long long tick_to_time(unsigned long long tick)
+{
+	tick *= CONFIG_SYS_HZ;
+	do_div(tick, TIMER_CLOCK);
+
+	return tick;
+}
+
+static inline unsigned long long usec_to_tick(unsigned long long usec)
+{
+	usec *= TIMER_CLOCK;
+	do_div(usec, 1000000);
+
+	return TIMER_LOAD_VAL - usec;
+}
+
 int timer_init(void)
 {
 	unsigned int oscc;
@@ -76,115 +95,63 @@ int timer_init(void)
 	cr |= FTTMR010_TM3_ENABLE;
 	writel(cr, &tmr->cr);
 
-	/* init the timestamp and lastdec value */
-	reset_timer_masked();
+	gd->tbu = gd->tbl = 0;
 
 	return 0;
 }
 
 /*
- * timer without interrupts
- */
-
-/*
- * reset time
+ * Get the current 64 bit timer tick count
  */
-void reset_timer_masked(void)
+unsigned long long get_ticks(void)
 {
-	/* capure current decrementer value time */
-	lastdec = readl(&tmr->timer3_counter) / (TIMER_CLOCK / CONFIG_SYS_HZ);
-	timestamp = 0;		/* start "advancing" time stamp from 0 */
-
-	debug("%s(): lastdec = %lx\n", __func__, lastdec);
-}
+	ulong now = TIMER_LOAD_VAL - readl(&tmr->timer3_counter);
 
-void reset_timer(void)
-{
 	debug("%s()\n", __func__);
-	reset_timer_masked();
-}
 
-/*
- * return timer ticks
- */
-ulong get_timer_masked(void)
-{
-	/* current tick value */
-	ulong now = readl(&tmr->timer3_counter) / (TIMER_CLOCK / CONFIG_SYS_HZ);
-
-	debug("%s(): now = %lx, lastdec = %lx\n", __func__, now, lastdec);
-
-	if (lastdec >= now) {
-		/*
-		 * normal mode (non roll)
-		 * move stamp fordward with absoulte diff ticks
-		 */
-		timestamp += lastdec - now;
-	} else {
-		/*
-		 * we have overflow of the count down timer
-		 *
-		 * nts = ts + ld + (TLV - now)
-		 * ts=old stamp, ld=time that passed before passing through -1
-		 * (TLV-now) amount of time after passing though -1
-		 * nts = new "advancing time stamp"...it could also roll and
-		 * cause problems.
-		 */
-		timestamp += lastdec + TIMER_LOAD_VAL - now;
-	}
-
-	lastdec = now;
-
-	debug("%s() returns %lx\n", __func__, timestamp);
-
-	return timestamp;
-}
-
-/*
- * return difference between timer ticks and base
- */
-ulong get_timer(ulong base)
-{
-	debug("%s(%lx)\n", __func__, base);
-	return get_timer_masked() - base;
-}
-
-void set_timer(ulong t)
-{
-	debug("%s(%lx)\n", __func__, t);
-	timestamp = t;
+	/* increment tbu if tbl has rolled over */
+	if (now < gd->tbl)
+		gd->tbu++;
+	gd->tbl = now;
+	return (((unsigned long long)gd->tbu) << 32) | gd->tbl;
 }
 
 /* delay x useconds AND preserve advance timestamp value */
 void __udelay(unsigned long usec)
 {
-	long tmo = usec * (TIMER_CLOCK / 1000) / 1000;
-	unsigned long now, last = readl(&tmr->timer3_counter);
-
-	debug("%s(%lu)\n", __func__, usec);
-	while (tmo > 0) {
-		now = readl(&tmr->timer3_counter);
-		if (now > last) /* count down timer overflow */
-			tmo -= TIMER_LOAD_VAL + last - now;
-		else
-			tmo -= last - now;
-		last = now;
-	}
+	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 */
+		;
 }
 
 /*
- * This function is derived from PowerPC code (read timebase as long long).
- * On ARM it just returns the timer value.
+ * reset_timer() and get_timer(base) are a pair of functions that are used by
+ * some timeout/sleep mechanisms in u-boot.
+ *
+ * reset_timer() marks the current time as epoch and
+ * get_timer(base) works relative to that epoch.
+ *
+ * The time is used in CONFIG_SYS_HZ units!
  */
-unsigned long long get_ticks(void)
+void reset_timer(void)
 {
 	debug("%s()\n", __func__);
-	return get_timer(0);
+	gd->timer_reset_value = get_ticks();
+}
+
+ulong get_timer(ulong base)
+{
+	debug("%s(%lx)\n", __func__, base);
+	return tick_to_time(get_ticks() - gd->timer_reset_value) - base;
 }
 
 /*
- * This function is derived from PowerPC code (timebase clock frequency).
- * On ARM it returns the number of timer ticks per second.
+ * Return the number of timer ticks per second.
  */
 ulong get_tbclk(void)
 {
diff --git a/arch/arm/include/asm/global_data.h b/arch/arm/include/asm/global_data.h
index ada3fbb..04c1564 100644
--- a/arch/arm/include/asm/global_data.h
+++ b/arch/arm/include/asm/global_data.h
@@ -61,6 +61,11 @@ typedef	struct	global_data {
 	unsigned long	tbu;
 	unsigned long long	timer_reset_value;
 #endif
+#ifdef CONFIG_FTTMR010_BASE
+	unsigned long	tbl;
+	unsigned long	tbu;
+	unsigned long long	timer_reset_value;
+#endif
 	unsigned long	relocaddr;	/* Start address of U-Boot in RAM */
 	phys_size_t	ram_size;	/* RAM size */
 	unsigned long	mon_len;	/* monitor len */
diff --git a/board/faraday/a320evb/config.mk b/board/faraday/a320evb/config.mk
deleted file mode 100644
index b751d0d..0000000
--- a/board/faraday/a320evb/config.mk
+++ /dev/null
@@ -1,35 +0,0 @@
-#
-# (C) Copyright 2009 Faraday Technology
-# Po-Yu Chuang <ratbert@faraday-tech.com>
-#
-# 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
-#
-
-# Faraday A320 board with FA526/FA626TE/ARM926EJ-S cpus
-#
-# see http://www.faraday-tech.com/ for more information
-
-# A320 has 1 bank of 64 MB DRAM
-#
-# 1000'0000 to 1400'0000
-#
-# Linux-Kernel is expected to be at 1000'8000, entry 1000'8000
-#
-# we load ourself to 13f8'0000
-#
-# download area is 1200'0000
-
-CONFIG_SYS_TEXT_BASE = 0x13f80000
diff --git a/include/configs/a320evb.h b/include/configs/a320evb.h
index f67cf06..0284d40 100644
--- a/include/configs/a320evb.h
+++ b/include/configs/a320evb.h
@@ -148,6 +148,8 @@
 #define CONFIG_SYS_MEMTEST_START	0x10000000
 #define CONFIG_SYS_MEMTEST_END		0x13F00000
 
+#define CONFIG_SYS_TEXT_BASE		0
+
 /*-----------------------------------------------------------------------
  * Static memory controller configuration
  */
-- 
1.6.3.3