Separate omap24xx specific code from arm1136

[u-boot] / cpu / arm1136 / omap24xx / interrupts.c

diff --git a/cpu/arm1136/omap24xx/interrupts.c b/cpu/arm1136/omap24xx/interrupts.c
new file mode 100644 (file)
index 0000000..a50fa39
--- /dev/null
+++ b/cpu/arm1136/omap24xx/interrupts.c
@@ -0,0 +1,159 @@
+/*
+ * (C) Copyright 2004
+ * Texas Instruments
+ * Richard Woodruff <r-woodruff2@ti.com>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ * Alex Zuepke <azu@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
+ *
+ * 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
+ */
+
+#include <common.h>
+#include <asm/arch/bits.h>
+#include <asm/arch/omap2420.h>
+
+#define TIMER_LOAD_VAL 0
+
+/* macro to read the 32 bit timer */
+#define READ_TIMER (*(volatile ulong *)(CFG_TIMERBASE+TCRR))
+
+static ulong timestamp;
+static ulong lastinc;
+
+/* nothing really to do with interrupts, just starts up a counter. */
+int interrupt_init (void)
+{
+       int32_t val;
+
+       /* Start the counter ticking up */
+       *((int32_t *) (CFG_TIMERBASE + TLDR)) = TIMER_LOAD_VAL; /* reload value on overflow*/
+       val = (CFG_PVT << 2) | BIT5 | BIT1 | BIT0;              /* mask to enable timer*/
+       *((int32_t *) (CFG_TIMERBASE + TCLR)) = val;    /* start timer */
+
+       reset_timer_masked(); /* init the timestamp and lastinc value */
+
+       return(0);
+}
+/*
+ * timer without interrupts
+ */
+void reset_timer (void)
+{
+       reset_timer_masked ();
+}
+
+ulong get_timer (ulong base)
+{
+       return get_timer_masked () - base;
+}
+
+void set_timer (ulong t)
+{
+       timestamp = t;
+}
+
+/* delay x useconds AND perserve advance timstamp 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 *= CFG_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 * CFG_HZ;
+               tmo /= (1000*1000);
+       }
+
+       tmp = get_timer (0);            /* get current timestamp */
+       if ( (tmo + tmp + 1) < tmp )/* if setting this forward will roll time stamp */
+               reset_timer_masked ();  /* reset "advancing" timestamp to 0, set lastinc 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 */
+       lastinc = READ_TIMER;           /* capture current incrementer value time */
+       timestamp = 0;                          /* start "advancing" time stamp from 0 */
+}
+
+ulong get_timer_masked (void)
+{
+       ulong now = READ_TIMER;         /* current tick value */
+
+       if (now >= lastinc)                     /* normal mode (non roll) */
+               timestamp += (now - lastinc); /* move stamp fordward with absoulte diff ticks */
+       else                                            /* we have rollover of incrementer */
+               timestamp += (0xFFFFFFFF - lastinc) + now;
+       lastinc = 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 *= CFG_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 * CFG_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)
+{
+       ulong tbclk;
+       tbclk = CFG_HZ;
+       return tbclk;
+}