lib: Move sbi core library to lib/sbi

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Acked-by: Anup Patel <anup.patel@wdc.com>

lib/sbi/sbi_timer.c

@@ -0,0 +1,68 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2019 Western Digital Corporation or its affiliates.
+ *
+ * Authors:
+ *   Anup Patel <anup.patel@wdc.com>
+ */
+
+#include <sbi/riscv_asm.h>
+#include <sbi/riscv_encoding.h>
+#include <sbi/sbi_platform.h>
+#include <sbi/sbi_timer.h>
+
+#if __riscv_xlen == 32
+u64 get_ticks(void)
+{
+	u32 lo, hi, tmp;
+	__asm__ __volatile__("1:\n"
+			     "rdtimeh %0\n"
+			     "rdtime %1\n"
+			     "rdtimeh %2\n"
+			     "bne %0, %2, 1b"
+			     : "=&r"(hi), "=&r"(lo), "=&r"(tmp));
+	return ((u64)hi << 32) | lo;
+}
+#else
+u64 get_ticks(void)
+{
+	unsigned long n;
+
+	__asm__ __volatile__("rdtime %0" : "=r"(n));
+	return n;
+}
+#endif
+
+u64 sbi_timer_value(struct sbi_scratch *scratch)
+{
+	const struct sbi_platform *plat = sbi_platform_ptr(scratch);
+
+	if (sbi_platform_has_timer_value(plat))
+		return sbi_platform_timer_value(plat);
+	else
+		return get_ticks();
+}
+
+void sbi_timer_event_stop(struct sbi_scratch *scratch)
+{
+	sbi_platform_timer_event_stop(sbi_platform_ptr(scratch));
+}
+
+void sbi_timer_event_start(struct sbi_scratch *scratch, u64 next_event)
+{
+	sbi_platform_timer_event_start(sbi_platform_ptr(scratch), next_event);
+	csr_clear(CSR_MIP, MIP_STIP);
+	csr_set(CSR_MIE, MIP_MTIP);
+}
+
+void sbi_timer_process(struct sbi_scratch *scratch)
+{
+	csr_clear(CSR_MIE, MIP_MTIP);
+	csr_set(CSR_MIP, MIP_STIP);
+}
+
+int sbi_timer_init(struct sbi_scratch *scratch, bool cold_boot)
+{
+	return sbi_platform_timer_init(sbi_platform_ptr(scratch), cold_boot);
+}