summaryrefslogtreecommitdiff
path: root/arch/arm/cpu/armv7/stv0991/timer.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/cpu/armv7/stv0991/timer.c')
-rw-r--r--arch/arm/cpu/armv7/stv0991/timer.c114
1 files changed, 114 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/stv0991/timer.c b/arch/arm/cpu/armv7/stv0991/timer.c
new file mode 100644
index 0000000..8654b8b
--- /dev/null
+++ b/arch/arm/cpu/armv7/stv0991/timer.c
@@ -0,0 +1,114 @@
+/*
+ * (C) Copyright 2014
+ * Vikas Manocha, ST Micoelectronics, vikas.manocha@st.com.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch-stv0991/hardware.h>
+#include <asm/arch-stv0991/stv0991_cgu.h>
+#include <asm/arch-stv0991/stv0991_gpt.h>
+
+static struct stv0991_cgu_regs *const stv0991_cgu_regs = \
+ (struct stv0991_cgu_regs *) (CGU_BASE_ADDR);
+
+#define READ_TIMER() (readl(&gpt1_regs_ptr->cnt) & GPT_FREE_RUNNING)
+#define GPT_RESOLUTION (CONFIG_STV0991_HZ_CLOCK / CONFIG_STV0991_HZ)
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define timestamp gd->arch.tbl
+#define lastdec gd->arch.lastinc
+
+int timer_init(void)
+{
+ /* Timer1 clock configuration */
+ writel(TIMER1_CLK_CFG, &stv0991_cgu_regs->tim_freq);
+ writel(readl(&stv0991_cgu_regs->cgu_enable_2) |
+ TIMER1_CLK_EN, &stv0991_cgu_regs->cgu_enable_2);
+
+ /* Stop the timer */
+ writel(readl(&gpt1_regs_ptr->cr1) & ~GPT_CR1_CEN, &gpt1_regs_ptr->cr1);
+ writel(GPT_PRESCALER_128, &gpt1_regs_ptr->psc);
+ /* Configure timer for auto-reload */
+ writel(readl(&gpt1_regs_ptr->cr1) | GPT_MODE_AUTO_RELOAD,
+ &gpt1_regs_ptr->cr1);
+
+ /* load value for free running */
+ writel(GPT_FREE_RUNNING, &gpt1_regs_ptr->arr);
+
+ /* start timer */
+ writel(readl(&gpt1_regs_ptr->cr1) | GPT_CR1_CEN,
+ &gpt1_regs_ptr->cr1);
+
+ /* Reset the timer */
+ lastdec = READ_TIMER();
+ timestamp = 0;
+
+ return 0;
+}
+
+/*
+ * timer without interrupts
+ */
+ulong get_timer(ulong base)
+{
+ return (get_timer_masked() / GPT_RESOLUTION) - base;
+}
+
+void __udelay(unsigned long usec)
+{
+ ulong tmo;
+ ulong start = get_timer_masked();
+ ulong tenudelcnt = CONFIG_STV0991_HZ_CLOCK / (1000 * 100);
+ ulong rndoff;
+
+ rndoff = (usec % 10) ? 1 : 0;
+
+ /* tenudelcnt timer tick gives 10 microsecconds delay */
+ tmo = ((usec / 10) + rndoff) * tenudelcnt;
+
+ while ((ulong) (get_timer_masked() - start) < tmo)
+ ;
+}
+
+ulong get_timer_masked(void)
+{
+ ulong now = READ_TIMER();
+
+ if (now >= lastdec) {
+ /* normal mode */
+ timestamp += now - lastdec;
+ } else {
+ /* we have an overflow ... */
+ timestamp += now + GPT_FREE_RUNNING - lastdec;
+ }
+ lastdec = now;
+
+ return timestamp;
+}
+
+void udelay_masked(unsigned long usec)
+{
+ return udelay(usec);
+}
+
+/*
+ * This function is derived from PowerPC code (read timebase as long long).
+ * On ARM it just returns the timer value.
+ */
+unsigned long long get_ticks(void)
+{
+ return get_timer(0);
+}
+
+/*
+ * This function is derived from PowerPC code (timebase clock frequency).
+ * On ARM it returns the number of timer ticks per second.
+ */
+ulong get_tbclk(void)
+{
+ return CONFIG_STV0991_HZ;
+}