Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / arch / arm / cpu / arm926ejs / omap / timer.c

diff --git a/qemu/roms/u-boot/arch/arm/cpu/arm926ejs/omap/timer.c b/qemu/roms/u-boot/arch/arm/cpu/arm926ejs/omap/timer.c
new file mode 100644 (file)
index 0000000..b971565
--- /dev/null
+++ b/qemu/roms/u-boot/arch/arm/cpu/arm926ejs/omap/timer.c
@@ -0,0 +1,152 @@
+/*
+ * (C) Copyright 2003
+ * Texas Instruments <www.ti.com>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Alex Zuepke <azu@sysgo.de>
+ *
+ * (C) Copyright 2002-2004
+ * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
+ *
+ * (C) Copyright 2004
+ * Philippe Robin, ARM Ltd. <philippe.robin@arm.com>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+
+#define TIMER_CLOCK    (CONFIG_SYS_CLK_FREQ / (2 << CONFIG_SYS_PTV))
+#define TIMER_LOAD_VAL 0xffffffff
+
+/* macro to read the 32 bit timer */
+#define READ_TIMER     readl(CONFIG_SYS_TIMERBASE+8) \
+                       / (TIMER_CLOCK / CONFIG_SYS_HZ)
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define timestamp gd->arch.tbl
+#define lastdec gd->arch.lastinc
+
+int timer_init (void)
+{
+       int32_t val;
+
+       /* Start the decrementer ticking down from 0xffffffff */
+       *((int32_t *) (CONFIG_SYS_TIMERBASE + LOAD_TIM)) = TIMER_LOAD_VAL;
+       val = MPUTIM_ST | MPUTIM_AR | MPUTIM_CLOCK_ENABLE | (CONFIG_SYS_PTV << MPUTIM_PTV_BIT);
+       *((int32_t *) (CONFIG_SYS_TIMERBASE + CNTL_TIMER)) = val;
+
+       /* init the timestamp and lastdec value */
+       reset_timer_masked();
+
+       return 0;
+}
+
+/*
+ * timer without interrupts
+ */
+ulong get_timer (ulong base)
+{
+       return get_timer_masked () - base;
+}
+
+/* delay x useconds AND preserve advance timestamp value */
+void __udelay (unsigned long usec)
+{
+       ulong tmo, tmp;
+
+       if(usec >= 1000){               /* if "big" number, spread normalization to seconds */
+               tmo = usec / 1000;      /* start to normalize for usec to ticks per sec */
+               tmo *= CONFIG_SYS_HZ;   /* find number of "ticks" to wait to achieve target */
+               tmo /= 1000;            /* finish normalize. */
+       }else{                          /* else small number, don't kill it prior to HZ multiply */
+               tmo = usec * CONFIG_SYS_HZ;
+               tmo /= (1000*1000);
+       }
+
+       tmp = get_timer (0);            /* get current timestamp */
+       if( (tmo + tmp + 1) < tmp )     /* if setting this fordward will roll time stamp */
+               reset_timer_masked ();  /* reset "advancing" timestamp to 0, set lastdec value */
+       else
+               tmo += tmp;             /* else, set advancing stamp wake up time */
+
+       while (get_timer_masked () < tmo)/* loop till event */
+               /*NOP*/;
+}
+
+void reset_timer_masked (void)
+{
+       /* reset time */
+       lastdec = READ_TIMER;  /* capure current decrementer value time */
+       timestamp = 0;         /* start "advancing" time stamp from 0 */
+}
+
+ulong get_timer_masked (void)
+{
+       ulong now = READ_TIMER;         /* current tick value */
+
+       if (lastdec >= now) {           /* normal mode (non roll) */
+               /* normal mode */
+               timestamp += lastdec - now; /* move stamp fordward with absoulte diff ticks */
+       } else {                        /* we have overflow of the count down timer */
+               /* nts = ts + ld + (TLV - now)
+                * ts=old stamp, ld=time that passed before passing through -1
+                * (TLV-now) amount of time after passing though -1
+                * nts = new "advancing time stamp"...it could also roll and cause problems.
+                */
+               timestamp += lastdec + (TIMER_LOAD_VAL / (TIMER_CLOCK /
+                                       CONFIG_SYS_HZ)) - now;
+       }
+       lastdec = now;
+
+       return timestamp;
+}
+
+/* waits specified delay value and resets timestamp */
+void udelay_masked (unsigned long usec)
+{
+       ulong tmo;
+       ulong endtime;
+       signed long diff;
+
+       if (usec >= 1000) {             /* if "big" number, spread normalization to seconds */
+               tmo = usec / 1000;      /* start to normalize for usec to ticks per sec */
+               tmo *= CONFIG_SYS_HZ;           /* find number of "ticks" to wait to achieve target */
+               tmo /= 1000;            /* finish normalize. */
+       } else {                        /* else small number, don't kill it prior to HZ multiply */
+               tmo = usec * CONFIG_SYS_HZ;
+               tmo /= (1000*1000);
+       }
+
+       endtime = get_timer_masked () + tmo;
+
+       do {
+               ulong now = get_timer_masked ();
+               diff = endtime - now;
+       } while (diff >= 0);
+}
+
+/*
+ * 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_SYS_HZ;
+}