Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / arch / arm / cpu / arm1136 / mx31 / timer.c

diff --git a/qemu/roms/u-boot/arch/arm/cpu/arm1136/mx31/timer.c b/qemu/roms/u-boot/arch/arm/cpu/arm1136/mx31/timer.c
new file mode 100644 (file)
index 0000000..f111242
--- /dev/null
+++ b/qemu/roms/u-boot/arch/arm/cpu/arm1136/mx31/timer.c
@@ -0,0 +1,147 @@
+/*
+ * (C) Copyright 2007
+ * Sascha Hauer, Pengutronix
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/arch/imx-regs.h>
+#include <asm/arch/clock.h>
+#include <div64.h>
+#include <watchdog.h>
+#include <asm/io.h>
+
+#define TIMER_BASE 0x53f90000 /* General purpose timer 1 */
+
+/* General purpose timers registers */
+#define GPTCR  __REG(TIMER_BASE)               /* Control register     */
+#define GPTPR  __REG(TIMER_BASE + 0x4)         /* Prescaler register   */
+#define GPTSR  __REG(TIMER_BASE + 0x8)         /* Status register      */
+#define GPTCNT __REG(TIMER_BASE + 0x24)        /* Counter register     */
+
+/* General purpose timers bitfields */
+#define GPTCR_SWR              (1 << 15)       /* Software reset       */
+#define GPTCR_FRR              (1 << 9)        /* Freerun / restart    */
+#define GPTCR_CLKSOURCE_32     (4 << 6)        /* Clock source         */
+#define GPTCR_TEN              1               /* Timer enable         */
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * "time" is measured in 1 / CONFIG_SYS_HZ seconds,
+ * "tick" is internal timer period
+ */
+
+#ifdef CONFIG_MX31_TIMER_HIGH_PRECISION
+/* ~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, MXC_CLK32);
+       return tick;
+}
+
+static inline unsigned long long time_to_tick(unsigned long long time)
+{
+       time *= MXC_CLK32;
+       do_div(time, CONFIG_SYS_HZ);
+       return time;
+}
+
+static inline unsigned long long us_to_tick(unsigned long long us)
+{
+       us = us * MXC_CLK32 + 999999;
+       do_div(us, 1000000);
+       return us;
+}
+#else
+/* ~2% error */
+#define TICK_PER_TIME  ((MXC_CLK32 + CONFIG_SYS_HZ / 2) / CONFIG_SYS_HZ)
+#define US_PER_TICK    (1000000 / MXC_CLK32)
+
+static inline unsigned long long tick_to_time(unsigned long long tick)
+{
+       do_div(tick, TICK_PER_TIME);
+       return tick;
+}
+
+static inline unsigned long long time_to_tick(unsigned long long time)
+{
+       return time * TICK_PER_TIME;
+}
+
+static inline unsigned long long us_to_tick(unsigned long long us)
+{
+       us += US_PER_TICK - 1;
+       do_div(us, US_PER_TICK);
+       return us;
+}
+#endif
+
+/* The 32768Hz 32-bit timer overruns in 131072 seconds */
+int timer_init(void)
+{
+       int i;
+
+       /* setup GP Timer 1 */
+       GPTCR = GPTCR_SWR;
+       for (i = 0; i < 100; i++)
+               GPTCR = 0; /* We have no udelay by now */
+       GPTPR = 0; /* 32Khz */
+       /* Freerun Mode, PERCLK1 input */
+       GPTCR |= GPTCR_CLKSOURCE_32 | GPTCR_TEN;
+
+       return 0;
+}
+
+unsigned long long get_ticks(void)
+{
+       ulong now = GPTCNT; /* current tick value */
+
+       if (now >= gd->arch.lastinc)    /* normal mode (non roll) */
+               /* move stamp forward with absolut diff ticks */
+               gd->arch.tbl += (now - gd->arch.lastinc);
+       else                    /* we have rollover of incrementer */
+               gd->arch.tbl += (0xFFFFFFFF - gd->arch.lastinc) + now;
+       gd->arch.lastinc = now;
+       return 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) ~
+        * 5 * 10^9 days... and get_ticks() * CONFIG_SYS_HZ wraps in
+        * 5 * 10^6 days - long enough.
+        */
+       return tick_to_time(get_ticks());
+}
+
+ulong get_timer(ulong base)
+{
+       return get_timer_masked() - base;
+}
+
+/* delay x useconds AND preserve advance timestamp value */
+void __udelay(unsigned long usec)
+{
+       unsigned long long tmp;
+       ulong tmo;
+
+       tmo = us_to_tick(usec);
+       tmp = get_ticks() + tmo;        /* get current timestamp */
+
+       while (get_ticks() < tmp)       /* loop till event */
+                /*NOP*/;
+}
+
+/*
+ * 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 MXC_CLK32;
+}