platform: Move platform common to lib/utils.

Currently, platform/common contains platform/non-platform specific
common minimal drivers and libraries. This is helpful is all platforms
are built within opensbi framework.

Move them to lib/utils so that any external platform code also can
reuse the minimalistic drivers or other common libraries.

This patch doesn't introduce any functional changes.

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

lib/utils/sys/clint.c

@@ -0,0 +1,162 @@
+/*
+ * 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_io.h>
+#include <sbi/riscv_atomic.h>
+#include <sbi/sbi_hart.h>
+#include <sbi_utils/sys/clint.h>
+
+static u32 clint_ipi_hart_count;
+static volatile void *clint_ipi_base;
+static volatile u32 *clint_ipi;
+
+void clint_ipi_send(u32 target_hart)
+{
+	if (clint_ipi_hart_count <= target_hart)
+		return;
+
+	/* Set CLINT IPI */
+	writel(1, &clint_ipi[target_hart]);
+}
+
+void clint_ipi_sync(u32 target_hart)
+{
+	u32 target_ipi, incoming_ipi;
+	u32 source_hart = sbi_current_hartid();
+
+	if (clint_ipi_hart_count <= target_hart)
+		return;
+
+	/* Wait until target HART has handled IPI */
+	incoming_ipi = 0;
+	while (1) {
+		target_ipi = readl(&clint_ipi[target_hart]);
+		if (!target_ipi)
+			break;
+
+		incoming_ipi |=
+			atomic_raw_xchg_uint(&clint_ipi[source_hart], 0);
+	}
+
+	if (incoming_ipi)
+		writel(incoming_ipi, &clint_ipi[source_hart]);
+}
+
+void clint_ipi_clear(u32 target_hart)
+{
+	if (clint_ipi_hart_count <= target_hart)
+		return;
+
+	/* Clear CLINT IPI */
+	writel(0, &clint_ipi[target_hart]);
+}
+
+int clint_warm_ipi_init(void)
+{
+	u32 hartid = sbi_current_hartid();
+
+	if (!clint_ipi_base)
+		return -1;
+
+	/* Clear CLINT IPI */
+	clint_ipi_clear(hartid);
+
+	return 0;
+}
+
+int clint_cold_ipi_init(unsigned long base, u32 hart_count)
+{
+	/* Figure-out CLINT IPI register address */
+	clint_ipi_hart_count = hart_count;
+	clint_ipi_base	     = (void *)base;
+	clint_ipi	     = (u32 *)clint_ipi_base;
+
+	return 0;
+}
+
+static u32 clint_time_hart_count;
+static volatile void *clint_time_base;
+static volatile u64 *clint_time_val;
+static volatile u64 *clint_time_cmp;
+
+u64 clint_timer_value(void)
+{
+#if __riscv_xlen == 64
+	return readq_relaxed(clint_time_val);
+#else
+	u64 tmp;
+	tmp = readl_relaxed((void *)clint_time_val + 0x04);
+	tmp <<= 32;
+	tmp |= readl_relaxed(clint_time_val);
+	return tmp;
+#endif
+}
+
+void clint_timer_event_stop(void)
+{
+	u32 target_hart = sbi_current_hartid();
+
+	if (clint_time_hart_count <= target_hart)
+		return;
+
+		/* Clear CLINT Time Compare */
+#if __riscv_xlen == 64
+	writeq_relaxed(-1ULL, &clint_time_cmp[target_hart]);
+#else
+	writel_relaxed(-1UL, &clint_time_cmp[target_hart]);
+	writel_relaxed(-1UL, (void *)(&clint_time_cmp[target_hart]) + 0x04);
+#endif
+}
+
+void clint_timer_event_start(u64 next_event)
+{
+	u32 target_hart = sbi_current_hartid();
+
+	if (clint_time_hart_count <= target_hart)
+		return;
+
+		/* Program CLINT Time Compare */
+#if __riscv_xlen == 64
+	writeq_relaxed(next_event, &clint_time_cmp[target_hart]);
+#else
+	u32 mask = -1UL;
+	writel_relaxed(next_event & mask, &clint_time_cmp[target_hart]);
+	writel_relaxed(next_event >> 32,
+		       (void *)(&clint_time_cmp[target_hart]) + 0x04);
+#endif
+}
+
+int clint_warm_timer_init(void)
+{
+	u32 target_hart = sbi_current_hartid();
+
+	if (clint_time_hart_count <= target_hart || !clint_time_base)
+		return -1;
+
+		/* Clear CLINT Time Compare */
+#if __riscv_xlen == 64
+	writeq_relaxed(-1ULL, &clint_time_cmp[target_hart]);
+#else
+	writel_relaxed(-1UL, &clint_time_cmp[target_hart]);
+	writel_relaxed(-1UL, (void *)(&clint_time_cmp[target_hart]) + 0x04);
+#endif
+
+	return 0;
+}
+
+int clint_cold_timer_init(unsigned long base, u32 hart_count)
+{
+	/* Figure-out CLINT Time register address */
+	clint_time_hart_count = hart_count;
+	clint_time_base	      = (void *)base;
+	clint_time_val	      = (u64 *)(clint_time_base + 0xbff8);
+	clint_time_cmp	      = (u64 *)(clint_time_base + 0x4000);
+
+	return 0;
+}

lib/utils/sys/objects.mk

@@ -0,0 +1,10 @@
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (c) 2019 Western Digital Corporation or its affiliates.
+#
+# Authors:
+#   Anup Patel <anup.patel@wdc.com>
+#
+
+libsbiutils-objs-$(PLATFORM_SYS_CLINT) += sys/clint.o