Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / arch / arm / cpu / arm1176 / tnetv107x / timer.c

diff --git a/qemu/roms/u-boot/arch/arm/cpu/arm1176/tnetv107x/timer.c b/qemu/roms/u-boot/arch/arm/cpu/arm1176/tnetv107x/timer.c
new file mode 100644 (file)
index 0000000..6e0dd0d
--- /dev/null
+++ b/qemu/roms/u-boot/arch/arm/cpu/arm1176/tnetv107x/timer.c
@@ -0,0 +1,93 @@
+/*
+ * TNETV107X: Timer implementation
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+
+struct timer_regs {
+       u_int32_t pid12;
+       u_int32_t pad[3];
+       u_int32_t tim12;
+       u_int32_t tim34;
+       u_int32_t prd12;
+       u_int32_t prd34;
+       u_int32_t tcr;
+       u_int32_t tgcr;
+       u_int32_t wdtcr;
+};
+
+#define regs ((struct timer_regs *)CONFIG_SYS_TIMERBASE)
+
+#define TIMER_LOAD_VAL (CONFIG_SYS_HZ_CLOCK / CONFIG_SYS_HZ)
+#define TIM_CLK_DIV    16
+
+static ulong timestamp;
+static ulong lastinc;
+
+int timer_init(void)
+{
+       clk_enable(TNETV107X_LPSC_TIMER0);
+
+       lastinc = timestamp = 0;
+
+       /* We are using timer34 in unchained 32-bit mode, full speed */
+       __raw_writel(0x0, &regs->tcr);
+       __raw_writel(0x0, &regs->tgcr);
+       __raw_writel(0x06 | ((TIM_CLK_DIV - 1) << 8), &regs->tgcr);
+       __raw_writel(0x0, &regs->tim34);
+       __raw_writel(TIMER_LOAD_VAL, &regs->prd34);
+       __raw_writel(2 << 22, &regs->tcr);
+
+       return 0;
+}
+
+static ulong get_timer_raw(void)
+{
+       ulong now = __raw_readl(&regs->tim34);
+
+       if (now >= lastinc)
+               timestamp += now - lastinc;
+       else
+               timestamp += now + TIMER_LOAD_VAL - lastinc;
+
+       lastinc = now;
+
+       return timestamp;
+}
+
+ulong get_timer(ulong base)
+{
+       return (get_timer_raw() / (TIMER_LOAD_VAL / TIM_CLK_DIV)) - base;
+}
+
+unsigned long long get_ticks(void)
+{
+       return get_timer(0);
+}
+
+void __udelay(unsigned long usec)
+{
+       ulong tmo;
+       ulong endtime;
+       signed long diff;
+
+       tmo = CONFIG_SYS_HZ_CLOCK / 1000;
+       tmo *= usec;
+       tmo /= (1000 * TIM_CLK_DIV);
+
+       endtime = get_timer_raw() + tmo;
+
+       do {
+               ulong now = get_timer_raw();
+               diff = endtime - now;
+       } while (diff >= 0);
+}
+
+ulong get_tbclk(void)
+{
+       return CONFIG_SYS_HZ;
+}