Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / arch / arm / cpu / arm926ejs / spear / timer.c

diff --git a/qemu/roms/u-boot/arch/arm/cpu/arm926ejs/spear/timer.c b/qemu/roms/u-boot/arch/arm/cpu/arm926ejs/spear/timer.c
new file mode 100644 (file)
index 0000000..c88e962
--- /dev/null
+++ b/qemu/roms/u-boot/arch/arm/cpu/arm926ejs/spear/timer.c
@@ -0,0 +1,123 @@
+/*
+ * (C) Copyright 2009
+ * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/spr_gpt.h>
+#include <asm/arch/spr_misc.h>
+
+#define GPT_RESOLUTION (CONFIG_SPEAR_HZ_CLOCK / CONFIG_SPEAR_HZ)
+#define READ_TIMER()   (readl(&gpt_regs_p->count) & GPT_FREE_RUNNING)
+
+static struct gpt_regs *const gpt_regs_p =
+    (struct gpt_regs *)CONFIG_SPEAR_TIMERBASE;
+
+static struct misc_regs *const misc_regs_p =
+    (struct misc_regs *)CONFIG_SPEAR_MISCBASE;
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define timestamp gd->arch.tbl
+#define lastdec gd->arch.lastinc
+
+int timer_init(void)
+{
+       u32 synth;
+
+       /* Prescaler setting */
+#if defined(CONFIG_SPEAR3XX)
+       writel(MISC_PRSC_CFG, &misc_regs_p->prsc2_clk_cfg);
+       synth = MISC_GPT4SYNTH;
+#elif defined(CONFIG_SPEAR600)
+       writel(MISC_PRSC_CFG, &misc_regs_p->prsc1_clk_cfg);
+       synth = MISC_GPT3SYNTH;
+#else
+# error Incorrect config. Can only be spear{600|300|310|320}
+#endif
+
+       writel(readl(&misc_regs_p->periph_clk_cfg) | synth,
+              &misc_regs_p->periph_clk_cfg);
+
+       /* disable timers */
+       writel(GPT_PRESCALER_1 | GPT_MODE_AUTO_RELOAD, &gpt_regs_p->control);
+
+       /* load value for free running */
+       writel(GPT_FREE_RUNNING, &gpt_regs_p->compare);
+
+       /* auto reload, start timer */
+       writel(readl(&gpt_regs_p->control) | GPT_ENABLE, &gpt_regs_p->control);
+
+       /* Reset the timer */
+       lastdec = READ_TIMER();
+       timestamp = 0;
+
+       return 0;
+}
+
+/*
+ * timer without interrupts
+ */
+ulong get_timer(ulong base)
+{
+       return (get_timer_masked() / GPT_RESOLUTION) - base;
+}
+
+void __udelay(unsigned long usec)
+{
+       ulong tmo;
+       ulong start = get_timer_masked();
+       ulong tenudelcnt = CONFIG_SPEAR_HZ_CLOCK / (1000 * 100);
+       ulong rndoff;
+
+       rndoff = (usec % 10) ? 1 : 0;
+
+       /* tenudelcnt timer tick gives 10 microsecconds delay */
+       tmo = ((usec / 10) + rndoff) * tenudelcnt;
+
+       while ((ulong) (get_timer_masked() - start) < tmo)
+               ;
+}
+
+ulong get_timer_masked(void)
+{
+       ulong now = READ_TIMER();
+
+       if (now >= lastdec) {
+               /* normal mode */
+               timestamp += now - lastdec;
+       } else {
+               /* we have an overflow ... */
+               timestamp += now + GPT_FREE_RUNNING - lastdec;
+       }
+       lastdec = now;
+
+       return timestamp;
+}
+
+void udelay_masked(unsigned long usec)
+{
+       return udelay(usec);
+}
+
+/*
+ * 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)
+{
+       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)
+{
+       return CONFIG_SPEAR_HZ;
+}