Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / openbios / drivers / timer.c

diff --git a/qemu/roms/openbios/drivers/timer.c b/qemu/roms/openbios/drivers/timer.c
new file mode 100644 (file)
index 0000000..d6794ae
--- /dev/null
+++ b/qemu/roms/openbios/drivers/timer.c
@@ -0,0 +1,100 @@
+/*
+ *   OpenBIOS native timer driver
+ *
+ *   (C) 2004 Stefan Reinauer <stepan@openbios.org>
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   version 2
+ *
+ */
+
+#include "config.h"
+#include "drivers/drivers.h"
+#include "timer.h"
+#include "asm/io.h"
+
+#if defined(CONFIG_X86) || defined(CONFIG_AMD64)
+
+void setup_timers(void)
+{
+       /* nothing to do */
+}
+
+static void load_timer2(unsigned int ticks)
+{
+       /* Set up the timer gate, turn off the speaker */
+       outb((inb(PPC_PORTB) & ~PPCB_SPKR) | PPCB_T2GATE, PPC_PORTB);
+       outb(TIMER2_SEL | WORD_ACCESS | MODE0 | BINARY_COUNT,
+            TIMER_MODE_PORT);
+       outb(ticks & 0xFF, TIMER2_PORT);
+       outb(ticks >> 8, TIMER2_PORT);
+}
+
+void udelay(unsigned int usecs)
+{
+       load_timer2((usecs * TICKS_PER_MS) / 1000);
+       while ((inb(PPC_PORTB) & PPCB_T2OUT) == 0);
+}
+
+unsigned long currticks(void)
+{
+       static unsigned long totticks = 0UL;    /* High resolution */
+       unsigned long ticks = 0;
+       unsigned char portb = inb(PPC_PORTB);
+
+       /*
+        * Read the timer, and hope it hasn't wrapped around
+        * (call this again within 54ms), then restart it
+        */
+       outb(TIMER2_SEL | LATCH_COUNT, TIMER_MODE_PORT);
+       ticks = inb(TIMER2_PORT);
+       ticks |= inb(TIMER2_PORT) << 8;
+       outb(TIMER2_SEL | WORD_ACCESS | MODE0 | BINARY_COUNT,
+            TIMER_MODE_PORT);
+       outb(0, TIMER2_PORT);
+       outb(0, TIMER2_PORT);
+
+       /*
+        * Check if the timer was running. If not,
+        * result is rubbish and need to start it
+        */
+       if (portb & PPCB_T2GATE) {
+               totticks += (0x10000 - ticks);
+       } else {
+               /* Set up the timer gate, turn off the speaker */
+               outb((portb & ~PPCB_SPKR) | PPCB_T2GATE, PPC_PORTB);
+       }
+       return totticks / TICKS_PER_MS;
+}
+#endif
+
+#ifdef CONFIG_PPC
+
+void setup_timers(void)
+{
+       /* nothing to do */
+}
+
+/*
+ * TODO: pass via lb table
+ */
+unsigned long timer_freq = 10000000 / 4;
+
+void udelay(unsigned int usecs)
+{
+       unsigned long ticksperusec = timer_freq / 1000000;
+       _wait_ticks(ticksperusec * usecs);
+}
+
+#endif
+
+void ndelay(unsigned int nsecs)
+{
+       udelay((nsecs + 999) / 1000);
+}
+
+void mdelay(unsigned int msecs)
+{
+       udelay(msecs * 1000);
+}