Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / arch / microblaze / cpu / timer.c

diff --git a/qemu/roms/u-boot/arch/microblaze/cpu/timer.c b/qemu/roms/u-boot/arch/microblaze/cpu/timer.c
new file mode 100644 (file)
index 0000000..3960bbb
--- /dev/null
+++ b/qemu/roms/u-boot/arch/microblaze/cpu/timer.c
@@ -0,0 +1,92 @@
+/*
+ * (C) Copyright 2007 Michal Simek
+ *
+ * Michal  SIMEK <monstr@monstr.eu>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/microblaze_timer.h>
+#include <asm/microblaze_intc.h>
+
+volatile int timestamp = 0;
+microblaze_timer_t *tmr;
+
+ulong get_timer (ulong base)
+{
+       if (tmr)
+               return timestamp - base;
+       return timestamp++ - base;
+}
+
+void __udelay(unsigned long usec)
+{
+       u32 i;
+
+       if (tmr) {
+               i = get_timer(0);
+               while ((get_timer(0) - i) < (usec / 1000))
+                       ;
+       } else {
+               for (i = 0; i < (usec * XILINX_CLOCK_FREQ / 10000000); i++)
+                       ;
+       }
+}
+
+#ifndef CONFIG_SPL_BUILD
+static void timer_isr(void *arg)
+{
+       timestamp++;
+       tmr->control = tmr->control | TIMER_INTERRUPT;
+}
+
+int timer_init (void)
+{
+       int irq = -1;
+       u32 preload = 0;
+       u32 ret = 0;
+
+#if defined(CONFIG_SYS_TIMER_0_ADDR) && defined(CONFIG_SYS_INTC_0_NUM)
+       preload = XILINX_CLOCK_FREQ / CONFIG_SYS_HZ;
+       irq = CONFIG_SYS_TIMER_0_IRQ;
+       tmr = (microblaze_timer_t *) (CONFIG_SYS_TIMER_0_ADDR);
+#endif
+
+       if (tmr && preload && irq >= 0) {
+               tmr->loadreg = preload;
+               tmr->control = TIMER_INTERRUPT | TIMER_RESET;
+               tmr->control = TIMER_ENABLE | TIMER_ENABLE_INTR |\
+                                       TIMER_RELOAD | TIMER_DOWN_COUNT;
+               timestamp = 0;
+               ret = install_interrupt_handler (irq, timer_isr, (void *)tmr);
+               if (ret)
+                       tmr = NULL;
+       }
+       /* No problem if timer is not found/initialized */
+       return 0;
+}
+#else
+int timer_init(void)
+{
+       return 0;
+}
+#endif
+
+/*
+ * This function is derived from PowerPC code (read timebase as long long).
+ * On Microblaze 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 Microblaze it returns the number of timer ticks per second.
+ */
+ulong get_tbclk(void)
+{
+       return CONFIG_SYS_HZ;
+}