*
* (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 <asm/arch/imx-regs.h>
+#include <asm/arch/crm_regs.h>
+
+DECLARE_GLOBAL_DATA_PTR;
/* 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 GPTPR_VAL (66)
+/*
+ * 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(GPTPR_VAL, &gpt->pre);
- /* Freerun Mode, PERCLK1 input */
- writel(readl(&gpt->ctrl) |
- GPTCR_CLKSOURCE_IPG | GPTCR_TEN,
- &gpt->ctrl);
- return 0;
-}
-
-void reset_timer_masked(void)
-{
- struct gpt_regs *gpt = (struct gpt_regs *)GPT1_BASE_ADDR;
-
- writel(0, &gpt->ctrl);
- /* Freerun Mode, PERCLK1 input */
- writel(GPTCR_CLKSOURCE_IPG | GPTCR_TEN,
- &gpt->ctrl);
-}
-
-inline ulong get_timer_masked(void)
-{
-
- struct gpt_regs *gpt = (struct gpt_regs *)GPT1_BASE_ADDR;
- ulong val = readl(&gpt->counter);
+ writel(readl(&ccm->cgr1) | 3 << MXC_CCM_CGR1_GPT_OFFSET, &ccm->cgr1);
- return val;
-}
-
-void reset_timer(void)
-{
- reset_timer_masked();
-}
-
-ulong get_timer(ulong base)
-{
- ulong tmp;
-
- tmp = get_timer_masked();
-
- if (tmp <= (base * 1000)) {
- /* Overflow */
- tmp += (0xffffffff - base);
- }
-
- return (tmp / 1000) - base;
-}
-
-/*
- * delay x useconds AND preserve advance timstamp value
- * GPTCNT is now supposed to tick 1 by 1 us.
- */
-void __udelay(unsigned long usec)
-{
- ulong tmp;
-
- tmp = get_timer_masked(); /* get current timestamp */
-
- /* if setting this forward will roll time stamp */
- if ((usec + tmp + 1) < tmp) {
- /* reset "advancing" timestamp to 0, set lastinc value */
- reset_timer_masked();
- } else {
- /* else, set advancing stamp wake up time */
- tmp += usec;
- }
+ 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);
- while (get_timer_masked() < tmp) /* loop till event */
- /*NOP*/;
+ return 0;
}