Move PP (last target) timer code in target tree

Put warnings in timer.h for incomplete targets (TIMER_FREQ not defined and/or timer-target.h inexistant)

Correct TIMER_STOP & TIMER_START macros arguments for target without timers
TIMER_START takes an extra argument in multicore builds (macro in macro doesn't work fine..)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21557 a1c6a512-1295-4272-9138-f99709370657

firmware/target/arm/timer-pp.c

@@ -0,0 +1,87 @@
+/***************************************************************************
+*             __________               __   ___.
+*   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+*   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+*   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+*   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+*                     \/            \/     \/    \/            \/
+* $Id$
+*
+* Copyright (C) 2006 Thom Johansen
+*
+* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+* KIND, either express or implied.
+*
+****************************************************************************/
+
+#include "cpu.h"
+#include "system.h"
+#include "timer.h"
+#include "timer-target.h"
+
+static long SHAREDBSS_ATTR cycles_new = 0;
+
+void TIMER2(void)
+{
+    TIMER2_VAL; /* ACK interrupt */
+    if (cycles_new > 0)
+    {
+        TIMER2_CFG = 0xc0000000 | (cycles_new - 1);
+        cycles_new = 0;
+    }
+    if (pfn_timer != NULL)
+    {
+        cycles_new = -1;
+        /* "lock" the variable, in case timer_set_period()
+         * is called within pfn_timer() */
+        pfn_timer();
+        cycles_new = 0;
+    }
+}
+
+bool __timer_set(long cycles, bool start)
+{
+    if (cycles > 0x20000000 || cycles < 2)
+        return false;
+
+    if (start)
+    {
+        if (pfn_unregister != NULL)
+        {
+            pfn_unregister();
+            pfn_unregister = NULL;
+        }
+        CPU_INT_DIS = TIMER2_MASK;
+        COP_INT_DIS = TIMER2_MASK;
+    }
+    if (start || (cycles_new == -1))  /* within isr, cycles_new is "locked" */
+        TIMER2_CFG = 0xc0000000 | (cycles - 1);    /* enable timer */
+    else
+        cycles_new = cycles;
+
+    return true;
+}
+
+bool __timer_start(IF_COP_VOID(int core))
+{
+    /* unmask interrupt source */
+#if NUM_CORES > 1
+    if (core == COP)
+        COP_INT_EN = TIMER2_MASK;
+    else
+#endif
+        CPU_INT_EN = TIMER2_MASK;
+    return true;
+}
+
+void __timer_stop(void)
+{
+    TIMER2_CFG = 0;         /* stop timer 2 */
+    CPU_INT_DIS = TIMER2_MASK;
+    COP_INT_DIS = TIMER2_MASK;
+}

firmware/target/arm/timer-target.h

@@ -0,0 +1,52 @@
+/***************************************************************************
+*             __________               __   ___.
+*   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+*   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+*   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+*   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+*                     \/            \/     \/    \/            \/
+* $Id$
+*
+* Copyright (C) 2006 Thom Johansen
+*
+* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+* KIND, either express or implied.
+*
+****************************************************************************/
+#ifndef TIMER_TARGET_H
+#define TIMER_TARGET_H
+
+#include "config.h"
+
+/* FIXME : this header is PP specific */
+#ifndef CPU_PP
+#error "PP specific header"
+#endif
+
+bool __timer_set(long cycles, bool start);
+bool __timer_start(IF_COP_VOID(int core));
+void __timer_stop(void);
+
+/* Portalplayer chips use a microsecond timer. */
+#define TIMER_FREQ 1000000
+
+#define __TIMER_SET(cycles, set) \
+    __timer_set(cycles, set)
+
+#if NUM_CORES > 1
+#define __TIMER_START(int_prio, core) \
+    __timer_start(core)
+#else
+#define __TIMER_START(int_prio) \
+    __timer_start()
+#endif
+
+#define __TIMER_STOP(...) \
+    __timer_stop()
+
+#endif /* TIMER_TARGET_H */