Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / arch / powerpc / lib / time.c

diff --git a/qemu/roms/u-boot/arch/powerpc/lib/time.c b/qemu/roms/u-boot/arch/powerpc/lib/time.c
new file mode 100644 (file)
index 0000000..62b6c72
--- /dev/null
+++ b/qemu/roms/u-boot/arch/powerpc/lib/time.c
@@ -0,0 +1,84 @@
+/*
+ * (C) Copyright 2000, 2001
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+
+/* ------------------------------------------------------------------------- */
+
+/*
+ * This function is intended for SHORT delays only.
+ * It will overflow at around 10 seconds @ 400MHz,
+ * or 20 seconds @ 200MHz.
+ */
+unsigned long usec2ticks(unsigned long usec)
+{
+       ulong ticks;
+
+       if (usec < 1000) {
+               ticks = ((usec * (get_tbclk()/1000)) + 500) / 1000;
+       } else {
+               ticks = ((usec / 10) * (get_tbclk() / 100000));
+       }
+
+       return (ticks);
+}
+
+/* ------------------------------------------------------------------------- */
+
+/*
+ * We implement the delay by converting the delay (the number of
+ * microseconds to wait) into a number of time base ticks; then we
+ * watch the time base until it has incremented by that amount.
+ */
+void __udelay(unsigned long usec)
+{
+       ulong ticks = usec2ticks (usec);
+       wait_ticks (ticks);
+}
+
+/* ------------------------------------------------------------------------- */
+#ifndef CONFIG_NAND_SPL
+unsigned long ticks2usec(unsigned long ticks)
+{
+       ulong tbclk = get_tbclk();
+
+       /* usec = ticks * 1000000 / tbclk
+        * Multiplication would overflow at ~4.2e3 ticks,
+        * so we break it up into
+        * usec = ( ( ticks * 1000) / tbclk ) * 1000;
+        */
+       ticks *= 1000L;
+       ticks /= tbclk;
+       ticks *= 1000L;
+
+       return ((ulong)ticks);
+}
+#endif
+/* ------------------------------------------------------------------------- */
+
+int init_timebase (void)
+{
+       unsigned long temp;
+
+#if defined(CONFIG_5xx) || defined(CONFIG_8xx)
+       volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
+
+       /* unlock */
+       immap->im_sitk.sitk_tbk = KAPWR_KEY;
+#endif
+
+       /* reset */
+       asm volatile("li %0,0 ; mttbu %0 ; mttbl %0;"
+            : "=&r"(temp) );
+
+#if defined(CONFIG_5xx) || defined(CONFIG_8xx)
+       /* enable */
+       immap->im_sit.sit_tbscr |= TBSCR_TBE;
+#endif
+       return (0);
+}
+/* ------------------------------------------------------------------------- */