Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / arch / nds32 / cpu / n1213 / ag102 / timer.c

diff --git a/qemu/roms/u-boot/arch/nds32/cpu/n1213/ag102/timer.c b/qemu/roms/u-boot/arch/nds32/cpu/n1213/ag102/timer.c
new file mode 100644 (file)
index 0000000..758b354
--- /dev/null
+++ b/qemu/roms/u-boot/arch/nds32/cpu/n1213/ag102/timer.c
@@ -0,0 +1,191 @@
+/*
+ * (C) Copyright 2009 Faraday Technology
+ * Po-Yu Chuang <ratbert@faraday-tech.com>
+ *
+ * Copyright (C) 2011 Andes Technology Corporation
+ * Shawn Lin, Andes Technology Corporation <nobuhiro@andestech.com>
+ * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <faraday/fttmr010.h>
+
+static ulong timestamp;
+static ulong lastdec;
+
+int timer_init(void)
+{
+       struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
+       unsigned int cr;
+
+       debug("%s()\n", __func__);
+
+       /* disable timers */
+       writel(0, &tmr->cr);
+
+#ifdef CONFIG_FTTMR010_EXT_CLK
+       /* use 32768Hz oscillator for RTC, WDT, TIMER */
+       ftpmu010_32768osc_enable();
+#endif
+
+       /* setup timer */
+       writel(TIMER_LOAD_VAL, &tmr->timer3_load);
+       writel(TIMER_LOAD_VAL, &tmr->timer3_counter);
+       writel(0, &tmr->timer3_match1);
+       writel(0, &tmr->timer3_match2);
+
+       /* we don't want timer to issue interrupts */
+       writel(FTTMR010_TM3_MATCH1 |
+              FTTMR010_TM3_MATCH2 |
+              FTTMR010_TM3_OVERFLOW,
+              &tmr->interrupt_mask);
+
+       cr = readl(&tmr->cr);
+#ifdef CONFIG_FTTMR010_EXT_CLK
+       cr |= FTTMR010_TM3_CLOCK;       /* use external clock */
+#endif
+       cr |= FTTMR010_TM3_ENABLE;
+       writel(cr, &tmr->cr);
+
+       /* init the timestamp and lastdec value */
+       reset_timer_masked();
+
+       return 0;
+}
+
+/*
+ * timer without interrupts
+ */
+
+/*
+ * reset time
+ */
+void reset_timer_masked(void)
+{
+       struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
+
+       /* capure current decrementer value time */
+#ifdef CONFIG_FTTMR010_EXT_CLK
+       lastdec = readl(&tmr->timer3_counter) / (TIMER_CLOCK / CONFIG_SYS_HZ);
+#else
+       lastdec = readl(&tmr->timer3_counter) /
+                       (CONFIG_SYS_CLK_FREQ / 2 / CONFIG_SYS_HZ);
+#endif
+       timestamp = 0;          /* start "advancing" time stamp from 0 */
+
+       debug("%s(): lastdec = %lx\n", __func__, lastdec);
+}
+
+void reset_timer(void)
+{
+       debug("%s()\n", __func__);
+       reset_timer_masked();
+}
+
+/*
+ * return timer ticks
+ */
+ulong get_timer_masked(void)
+{
+       struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
+
+       /* current tick value */
+#ifdef CONFIG_FTTMR010_EXT_CLK
+       ulong now = readl(&tmr->timer3_counter) / (TIMER_CLOCK / CONFIG_SYS_HZ);
+#else
+       ulong now = readl(&tmr->timer3_counter) /
+                       (CONFIG_SYS_CLK_FREQ / 2 / CONFIG_SYS_HZ);
+#endif
+
+       debug("%s(): now = %lx, lastdec = %lx\n", __func__, now, lastdec);
+
+       if (lastdec >= now) {
+               /*
+                * normal mode (non roll)
+                * move stamp fordward with absoulte diff ticks
+                */
+               timestamp += lastdec - now;
+       } else {
+               /*
+                * we have overflow of the count down timer
+                *
+                * nts = ts + ld + (TLV - now)
+                * ts=old stamp, ld=time that passed before passing through -1
+                * (TLV-now) amount of time after passing though -1
+                * nts = new "advancing time stamp"...it could also roll and
+                * cause problems.
+                */
+               timestamp += lastdec + TIMER_LOAD_VAL - now;
+       }
+
+       lastdec = now;
+
+       debug("%s() returns %lx\n", __func__, timestamp);
+
+       return timestamp;
+}
+
+/*
+ * return difference between timer ticks and base
+ */
+ulong get_timer(ulong base)
+{
+       debug("%s(%lx)\n", __func__, base);
+       return get_timer_masked() - base;
+}
+
+void set_timer(ulong t)
+{
+       debug("%s(%lx)\n", __func__, t);
+       timestamp = t;
+}
+
+/* delay x useconds AND preserve advance timestamp value */
+void __udelay(unsigned long usec)
+{
+       struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
+
+#ifdef CONFIG_FTTMR010_EXT_CLK
+       long tmo = usec * (TIMER_CLOCK / 1000) / 1000;
+#else
+       long tmo = usec * ((CONFIG_SYS_CLK_FREQ / 2) / 1000) / 1000;
+#endif
+       unsigned long now, last = readl(&tmr->timer3_counter);
+
+       debug("%s(%lu)\n", __func__, usec);
+       while (tmo > 0) {
+               now = readl(&tmr->timer3_counter);
+               if (now > last) /* count down timer overflow */
+                       tmo -= TIMER_LOAD_VAL + last - now;
+               else
+                       tmo -= last - now;
+               last = now;
+       }
+}
+
+/*
+ * 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)
+{
+       debug("%s()\n", __func__);
+       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)
+{
+       debug("%s()\n", __func__);
+#ifdef CONFIG_FTTMR010_EXT_CLK
+       return CONFIG_SYS_HZ;
+#else
+       return CONFIG_SYS_CLK_FREQ;
+#endif
+}