*
* (C) Copyright 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 <div64.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/clock.h>
+#include <asm/arch/sys_proto.h>
/* General purpose timers registers */
struct mxc_gpt {
/* General purpose timers bitfields */
#define GPTCR_SWR (1 << 15) /* Software reset */
+#define GPTCR_24MEN (1 << 10) /* Enable 24MHz clock input */
#define GPTCR_FRR (1 << 9) /* Freerun / restart */
-#define GPTCR_CLKSOURCE_32 (4 << 6) /* Clock source */
+#define GPTCR_CLKSOURCE_32 (4 << 6) /* Clock source 32khz */
+#define GPTCR_CLKSOURCE_OSC (5 << 6) /* Clock source OSC */
+#define GPTCR_CLKSOURCE_PRE (1 << 6) /* Clock source PRECLK */
+#define GPTCR_CLKSOURCE_MASK (0x7 << 6)
#define GPTCR_TEN 1 /* Timer enable */
+#define GPTPR_PRESCALER24M_SHIFT 12
+#define GPTPR_PRESCALER24M_MASK (0xF << GPTPR_PRESCALER24M_SHIFT)
+
DECLARE_GLOBAL_DATA_PTR;
-#define timestamp (gd->arch.tbl)
-#define lastinc (gd->arch.lastinc)
+static inline int gpt_has_clk_source_osc(void)
+{
+#if defined(CONFIG_ARCH_MX6)
+ if (((is_cpu_type(MXC_CPU_MX6Q) || is_cpu_type(MXC_CPU_MX6D)) &&
+ (soc_rev() > CHIP_REV_1_0)) || is_cpu_type(MXC_CPU_MX6DL) ||
+ is_cpu_type(MXC_CPU_MX6SOLO) || is_cpu_type(MXC_CPU_MX6SX) ||
+ is_cpu_type(MXC_CPU_MX6UL))
+ return 1;
+
+ return 0;
+#else
+ return 0;
+#endif
+}
+static inline ulong gpt_get_clk(void)
+{
+#ifdef CONFIG_MXC_GPT_HCLK
+ if (gpt_has_clk_source_osc())
+ return MXC_HCLK >> 3;
+ else
+ return mxc_get_clock(MXC_IPG_PERCLK);
+#else
+ return MXC_CLK32;
+#endif
+}
static inline unsigned long long tick_to_time(unsigned long long tick)
{
+ ulong gpt_clk = gpt_get_clk();
+
tick *= CONFIG_SYS_HZ;
- do_div(tick, MXC_CLK32);
+ do_div(tick, gpt_clk);
return tick;
}
+static inline unsigned long long time_to_tick(unsigned long time)
+{
+ unsigned long long ticks = (unsigned long long)time;
+
+ ticks *= gpt_get_clk();
+ do_div(ticks, CONFIG_SYS_HZ);
+ return ticks;
+}
+
static inline unsigned long long us_to_tick(unsigned long long usec)
{
- usec = usec * MXC_CLK32 + 999999;
+ ulong gpt_clk = gpt_get_clk();
+
+ usec = usec * gpt_clk + 999999;
do_div(usec, 1000000);
return usec;
int timer_init(void)
{
int i;
- ulong val;
/* setup GP Timer 1 */
__raw_writel(GPTCR_SWR, &cur_gpt->control);
for (i = 0; i < 100; i++)
__raw_writel(0, &cur_gpt->control);
- __raw_writel(0, &cur_gpt->prescaler); /* 32Khz */
-
- /* Freerun Mode, PERCLK1 input */
i = __raw_readl(&cur_gpt->control);
- __raw_writel(i | GPTCR_CLKSOURCE_32 | GPTCR_TEN, &cur_gpt->control);
+ i &= ~GPTCR_CLKSOURCE_MASK;
+
+#ifdef CONFIG_MXC_GPT_HCLK
+ if (gpt_has_clk_source_osc()) {
+ i |= GPTCR_CLKSOURCE_OSC | GPTCR_TEN;
+
+ /* For DL/S, SX, UL, set 24Mhz OSC Enable bit and prescaler */
+ if (is_cpu_type(MXC_CPU_MX6DL) ||
+ is_cpu_type(MXC_CPU_MX6SOLO) ||
+ is_cpu_type(MXC_CPU_MX6SX) ||
+ is_cpu_type(MXC_CPU_MX6UL)) {
+ i |= GPTCR_24MEN;
+
+ /* Produce 3Mhz clock */
+ __raw_writel((7 << GPTPR_PRESCALER24M_SHIFT),
+ &cur_gpt->prescaler);
+ }
+ } else {
+ i |= GPTCR_CLKSOURCE_PRE | GPTCR_TEN;
+ }
+#else
+ __raw_writel(0, &cur_gpt->prescaler); /* 32Khz */
+ i |= GPTCR_CLKSOURCE_32 | GPTCR_TEN;
+#endif
+ __raw_writel(i, &cur_gpt->control);
- val = __raw_readl(&cur_gpt->counter);
- lastinc = val / (MXC_CLK32 / CONFIG_SYS_HZ);
- timestamp = 0;
+ gd->arch.tbl = __raw_readl(&cur_gpt->counter);
+ gd->arch.tbu = 0;
+ gd->arch.timer_rate_hz = gpt_get_clk();
return 0;
}
{
ulong now = __raw_readl(&cur_gpt->counter); /* current tick value */
- if (now >= lastinc) {
- /*
- * normal mode (non roll)
- * move stamp forward with absolut diff ticks
- */
- timestamp += (now - lastinc);
- } else {
- /* we have rollover of incrementer */
- timestamp += (0xFFFFFFFF - lastinc) + now;
- }
- lastinc = now;
- return timestamp;
+ /* increment tbu if tbl has rolled over */
+ if (now < gd->arch.tbl)
+ gd->arch.tbu++;
+ gd->arch.tbl = now;
+ return (((unsigned long long)gd->arch.tbu) << 32) | gd->arch.tbl;
}
ulong get_timer_masked(void)
{
/*
* get_ticks() returns a long long (64 bit), it wraps in
- * 2^64 / MXC_CLK32 = 2^64 / 2^15 = 2^49 ~ 5 * 10^14 (s) ~
+ * 2^64 / GPT_CLK = 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.
*/
ulong get_timer(ulong base)
{
- return get_timer_masked() - base;
+ return tick_to_time(get_ticks() - time_to_tick(base));
}
/* delay x useconds AND preserve advance timstamp value */
void __udelay(unsigned long usec)
{
- unsigned long long tmp;
- ulong tmo;
+ unsigned long start = __raw_readl(&cur_gpt->counter);
+ unsigned long ticks;
+
+ if (usec == 0)
+ return;
- tmo = us_to_tick(usec);
- tmp = get_ticks() + tmo; /* get current timestamp */
+ ticks = us_to_tick(usec);
+ if (ticks == 0)
+ ticks++;
- while (get_ticks() < tmp) /* loop till event */
- /*NOP*/;
+ while (__raw_readl(&cur_gpt->counter) - start < ticks)
+ /* loop till event */;
}
/*
*/
ulong get_tbclk(void)
{
- return MXC_CLK32;
+ return gpt_get_clk();
+}
+
+/*
+ * This function is intended for SHORT delays only.
+ * It will overflow at around 10 seconds @ 400MHz,
+ * or 20 seconds @ 200MHz.
+ */
+unsigned long usec2ticks(unsigned long usec)
+{
+ ulong ticks;
+
+ if (usec < 1000)
+ ticks = ((usec * (get_tbclk()/1000)) + 500) / 1000;
+ else
+ ticks = ((usec / 10) * (get_tbclk() / 100000));
+
+ return ticks;
}
projects / karo-tx-uboot.git / blobdiff