X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=arch%2Farm%2Fcpu%2Farm1136%2Fmx35%2Ftimer.c;h=cc6166f938b4e04adb01a587c36bafc49bf73f7a;hb=8b485ba12b0defa0c4ed3559789250238f8331a8;hp=04937a1dfeb733ad342b0a1c9821dabf822e7207;hpb=8a1239e74cdf4d94738eb71928769d6e78bcc78c;p=u-boot

diff --git a/arch/arm/cpu/arm1136/mx35/timer.c b/arch/arm/cpu/arm1136/mx35/timer.c
index 04937a1dfe..cc6166f938 100644
--- a/arch/arm/cpu/arm1136/mx35/timer.c
+++ b/arch/arm/cpu/arm1136/mx35/timer.c
@@ -4,76 +4,70 @@
  *
  * (C) Copyright 2008-2009 Freescale Semiconductor, Inc.
  *
- * 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 <asm/io.h>
 #include <div64.h>
 #include <asm/arch/imx-regs.h>
+#include <asm/arch/crm_regs.h>
 #include <asm/arch/clock.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
-#define timestamp	(gd->tbl)
-#define lastinc		(gd->lastinc)
+#define timestamp	(gd->arch.tbl)
+#define lastinc		(gd->arch.lastinc)
 
 /* General purpose timers bitfields */
 #define GPTCR_SWR       (1<<15)	/* Software reset */
 #define GPTCR_FRR       (1<<9)	/* Freerun / restart */
-#define GPTCR_CLKSOURCE_32   (0x100<<6)	/* Clock source */
-#define GPTCR_CLKSOURCE_IPG (0x001<<6)	/* Clock source */
+#define GPTCR_CLKSOURCE_32   (4<<6)	/* Clock source */
 #define GPTCR_TEN       (1)	/* Timer enable */
 
-#define	TIMER_FREQ_HZ	mxc_get_clock(MXC_IPG_CLK)
-
+/*
+ * "time" is measured in 1 / CONFIG_SYS_HZ seconds,
+ * "tick" is internal timer period
+ */
+/* ~0.4% error - measured with stop-watch on 100s boot-delay */
 static inline unsigned long long tick_to_time(unsigned long long tick)
 {
 	tick *= CONFIG_SYS_HZ;
-	do_div(tick, TIMER_FREQ_HZ);
+	do_div(tick, MXC_CLK32);
 
 	return tick;
 }
 
-static inline unsigned long long us_to_tick(unsigned long long usec)
+static inline unsigned long long us_to_tick(unsigned long long us)
 {
-	usec *= TIMER_FREQ_HZ;
-	do_div(usec, 1000000);
+	us = us * MXC_CLK32 + 999999;
+	do_div(us, 1000000);
 
-	return usec;
+	return us;
 }
 
+/*
+ * nothing really to do with interrupts, just starts up a counter.
+ * The 32KHz 32-bit timer overruns in 134217 seconds
+ */
 int timer_init(void)
 {
 	int i;
 	struct gpt_regs *gpt = (struct gpt_regs *)GPT1_BASE_ADDR;
+	struct ccm_regs *ccm = (struct ccm_regs *)CCM_BASE_ADDR;
 
 	/* setup GP Timer 1 */
 	writel(GPTCR_SWR, &gpt->ctrl);
-	for (i = 0; i < 100; i++)
-		writel(0, &gpt->ctrl);	/* We have no udelay by now */
 
-	writel(0, &gpt->pre);
-	/* Freerun Mode, PERCLK1 input */
-	writel(readl(&gpt->ctrl) |
-		GPTCR_CLKSOURCE_IPG | GPTCR_TEN,
-		&gpt->ctrl);
+	writel(readl(&ccm->cgr1) | 3 << MXC_CCM_CGR1_GPT_OFFSET, &ccm->cgr1);
+
+	for (i = 0; i < 100; i++)
+		writel(0, &gpt->ctrl); /* We have no udelay by now */
+	writel(0, &gpt->pre); /* prescaler = 1 */
+	/* Freerun Mode, 32KHz input */
+	writel(readl(&gpt->ctrl) | GPTCR_CLKSOURCE_32 | GPTCR_FRR,
+			&gpt->ctrl);
+	writel(readl(&gpt->ctrl) | GPTCR_TEN, &gpt->ctrl);
 
 	return 0;
 }
@@ -101,7 +95,7 @@ ulong get_timer_masked(void)
 {
 	/*
 	 * get_ticks() returns a long long (64 bit), it wraps in
-	 * 2^64 / CONFIG_MX25_CLK32 = 2^64 / 2^15 = 2^49 ~ 5 * 10^14 (s) ~
+	 * 2^64 / MXC_CLK32 = 2^64 / 2^15 = 2^49 ~ 5 * 10^14 (s) ~
 	 * 5 * 10^9 days... and get_ticks() * CONFIG_SYS_HZ wraps in
 	 * 5 * 10^6 days - long enough.
 	 */
@@ -132,5 +126,5 @@ void __udelay(unsigned long usec)
  */
 ulong get_tbclk(void)
 {
-	return TIMER_FREQ_HZ;
+	return MXC_CLK32;
 }