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-rw-r--r--arch/arm/imx-common/timer.c75
1 files changed, 66 insertions, 9 deletions
diff --git a/arch/arm/imx-common/timer.c b/arch/arm/imx-common/timer.c
index c63f78f..65ef60b 100644
--- a/arch/arm/imx-common/timer.c
+++ b/arch/arm/imx-common/timer.c
@@ -12,6 +12,7 @@
#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 {
@@ -26,23 +27,59 @@ static struct mxc_gpt *cur_gpt = (struct mxc_gpt *)GPT1_BASE_ADDR;
/* 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;
+static inline int gpt_has_clk_source_osc(void)
+{
+#if defined(CONFIG_MX6)
+ if (((is_cpu_type(MXC_CPU_MX6Q) || is_cpu_type(MXC_CPU_MX6D)) &&
+ (is_soc_rev(CHIP_REV_1_0) > 0)) || is_cpu_type(MXC_CPU_MX6DL) ||
+ is_cpu_type(MXC_CPU_MX6SOLO) || is_cpu_type(MXC_CPU_MX6SX))
+ 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 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;
@@ -59,11 +96,31 @@ int timer_init(void)
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, 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)) {
+ 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);
gd->arch.tbl = __raw_readl(&cur_gpt->counter);
gd->arch.tbu = 0;
@@ -86,7 +143,7 @@ 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.
*/
@@ -117,5 +174,5 @@ void __udelay(unsigned long usec)
*/
ulong get_tbclk(void)
{
- return MXC_CLK32;
+ return gpt_get_clk();
}